1 /* 2 * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "assembler_x86.inline.hpp" 27 #include "gc_interface/collectedHeap.inline.hpp" 28 #include "interpreter/interpreter.hpp" 29 #include "memory/cardTableModRefBS.hpp" 30 #include "memory/resourceArea.hpp" 31 #include "prims/methodHandles.hpp" 32 #include "runtime/biasedLocking.hpp" 33 #include "runtime/interfaceSupport.hpp" 34 #include "runtime/objectMonitor.hpp" 35 #include "runtime/os.hpp" 36 #include "runtime/sharedRuntime.hpp" 37 #include "runtime/stubRoutines.hpp" 38 #ifndef SERIALGC 39 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" 40 #include "gc_implementation/g1/g1SATBCardTableModRefBS.hpp" 41 #include "gc_implementation/g1/heapRegion.hpp" 42 #endif 43 44 // Implementation of AddressLiteral 45 46 AddressLiteral::AddressLiteral(address target, relocInfo::relocType rtype) { 47 _is_lval = false; 48 _target = target; 49 switch (rtype) { 50 case relocInfo::oop_type: 51 // Oops are a special case. Normally they would be their own section 52 // but in cases like icBuffer they are literals in the code stream that 53 // we don't have a section for. We use none so that we get a literal address 54 // which is always patchable. 55 break; 56 case relocInfo::external_word_type: 57 _rspec = external_word_Relocation::spec(target); 58 break; 59 case relocInfo::internal_word_type: 60 _rspec = internal_word_Relocation::spec(target); 61 break; 62 case relocInfo::opt_virtual_call_type: 63 _rspec = opt_virtual_call_Relocation::spec(); 64 break; 65 case relocInfo::static_call_type: 66 _rspec = static_call_Relocation::spec(); 67 break; 68 case relocInfo::runtime_call_type: 69 _rspec = runtime_call_Relocation::spec(); 70 break; 71 case relocInfo::poll_type: 72 case relocInfo::poll_return_type: 73 _rspec = Relocation::spec_simple(rtype); 74 break; 75 case relocInfo::none: 76 break; 77 default: 78 ShouldNotReachHere(); 79 break; 80 } 81 } 82 83 // Implementation of Address 84 85 #ifdef _LP64 86 87 Address Address::make_array(ArrayAddress adr) { 88 // Not implementable on 64bit machines 89 // Should have been handled higher up the call chain. 90 ShouldNotReachHere(); 91 return Address(); 92 } 93 94 // exceedingly dangerous constructor 95 Address::Address(int disp, address loc, relocInfo::relocType rtype) { 96 _base = noreg; 97 _index = noreg; 98 _scale = no_scale; 99 _disp = disp; 100 switch (rtype) { 101 case relocInfo::external_word_type: 102 _rspec = external_word_Relocation::spec(loc); 103 break; 104 case relocInfo::internal_word_type: 105 _rspec = internal_word_Relocation::spec(loc); 106 break; 107 case relocInfo::runtime_call_type: 108 // HMM 109 _rspec = runtime_call_Relocation::spec(); 110 break; 111 case relocInfo::poll_type: 112 case relocInfo::poll_return_type: 113 _rspec = Relocation::spec_simple(rtype); 114 break; 115 case relocInfo::none: 116 break; 117 default: 118 ShouldNotReachHere(); 119 } 120 } 121 #else // LP64 122 123 Address Address::make_array(ArrayAddress adr) { 124 AddressLiteral base = adr.base(); 125 Address index = adr.index(); 126 assert(index._disp == 0, "must not have disp"); // maybe it can? 127 Address array(index._base, index._index, index._scale, (intptr_t) base.target()); 128 array._rspec = base._rspec; 129 return array; 130 } 131 132 // exceedingly dangerous constructor 133 Address::Address(address loc, RelocationHolder spec) { 134 _base = noreg; 135 _index = noreg; 136 _scale = no_scale; 137 _disp = (intptr_t) loc; 138 _rspec = spec; 139 } 140 141 #endif // _LP64 142 143 144 145 // Convert the raw encoding form into the form expected by the constructor for 146 // Address. An index of 4 (rsp) corresponds to having no index, so convert 147 // that to noreg for the Address constructor. 148 Address Address::make_raw(int base, int index, int scale, int disp, bool disp_is_oop) { 149 RelocationHolder rspec; 150 if (disp_is_oop) { 151 rspec = Relocation::spec_simple(relocInfo::oop_type); 152 } 153 bool valid_index = index != rsp->encoding(); 154 if (valid_index) { 155 Address madr(as_Register(base), as_Register(index), (Address::ScaleFactor)scale, in_ByteSize(disp)); 156 madr._rspec = rspec; 157 return madr; 158 } else { 159 Address madr(as_Register(base), noreg, Address::no_scale, in_ByteSize(disp)); 160 madr._rspec = rspec; 161 return madr; 162 } 163 } 164 165 // Implementation of Assembler 166 167 int AbstractAssembler::code_fill_byte() { 168 return (u_char)'\xF4'; // hlt 169 } 170 171 // make this go away someday 172 void Assembler::emit_data(jint data, relocInfo::relocType rtype, int format) { 173 if (rtype == relocInfo::none) 174 emit_long(data); 175 else emit_data(data, Relocation::spec_simple(rtype), format); 176 } 177 178 void Assembler::emit_data(jint data, RelocationHolder const& rspec, int format) { 179 assert(imm_operand == 0, "default format must be immediate in this file"); 180 assert(inst_mark() != NULL, "must be inside InstructionMark"); 181 if (rspec.type() != relocInfo::none) { 182 #ifdef ASSERT 183 check_relocation(rspec, format); 184 #endif 185 // Do not use AbstractAssembler::relocate, which is not intended for 186 // embedded words. Instead, relocate to the enclosing instruction. 187 188 // hack. call32 is too wide for mask so use disp32 189 if (format == call32_operand) 190 code_section()->relocate(inst_mark(), rspec, disp32_operand); 191 else 192 code_section()->relocate(inst_mark(), rspec, format); 193 } 194 emit_long(data); 195 } 196 197 static int encode(Register r) { 198 int enc = r->encoding(); 199 if (enc >= 8) { 200 enc -= 8; 201 } 202 return enc; 203 } 204 205 static int encode(XMMRegister r) { 206 int enc = r->encoding(); 207 if (enc >= 8) { 208 enc -= 8; 209 } 210 return enc; 211 } 212 213 void Assembler::emit_arith_b(int op1, int op2, Register dst, int imm8) { 214 assert(dst->has_byte_register(), "must have byte register"); 215 assert(isByte(op1) && isByte(op2), "wrong opcode"); 216 assert(isByte(imm8), "not a byte"); 217 assert((op1 & 0x01) == 0, "should be 8bit operation"); 218 emit_byte(op1); 219 emit_byte(op2 | encode(dst)); 220 emit_byte(imm8); 221 } 222 223 224 void Assembler::emit_arith(int op1, int op2, Register dst, int32_t imm32) { 225 assert(isByte(op1) && isByte(op2), "wrong opcode"); 226 assert((op1 & 0x01) == 1, "should be 32bit operation"); 227 assert((op1 & 0x02) == 0, "sign-extension bit should not be set"); 228 if (is8bit(imm32)) { 229 emit_byte(op1 | 0x02); // set sign bit 230 emit_byte(op2 | encode(dst)); 231 emit_byte(imm32 & 0xFF); 232 } else { 233 emit_byte(op1); 234 emit_byte(op2 | encode(dst)); 235 emit_long(imm32); 236 } 237 } 238 239 // immediate-to-memory forms 240 void Assembler::emit_arith_operand(int op1, Register rm, Address adr, int32_t imm32) { 241 assert((op1 & 0x01) == 1, "should be 32bit operation"); 242 assert((op1 & 0x02) == 0, "sign-extension bit should not be set"); 243 if (is8bit(imm32)) { 244 emit_byte(op1 | 0x02); // set sign bit 245 emit_operand(rm, adr, 1); 246 emit_byte(imm32 & 0xFF); 247 } else { 248 emit_byte(op1); 249 emit_operand(rm, adr, 4); 250 emit_long(imm32); 251 } 252 } 253 254 void Assembler::emit_arith(int op1, int op2, Register dst, jobject obj) { 255 LP64_ONLY(ShouldNotReachHere()); 256 assert(isByte(op1) && isByte(op2), "wrong opcode"); 257 assert((op1 & 0x01) == 1, "should be 32bit operation"); 258 assert((op1 & 0x02) == 0, "sign-extension bit should not be set"); 259 InstructionMark im(this); 260 emit_byte(op1); 261 emit_byte(op2 | encode(dst)); 262 emit_data((intptr_t)obj, relocInfo::oop_type, 0); 263 } 264 265 266 void Assembler::emit_arith(int op1, int op2, Register dst, Register src) { 267 assert(isByte(op1) && isByte(op2), "wrong opcode"); 268 emit_byte(op1); 269 emit_byte(op2 | encode(dst) << 3 | encode(src)); 270 } 271 272 273 void Assembler::emit_operand(Register reg, Register base, Register index, 274 Address::ScaleFactor scale, int disp, 275 RelocationHolder const& rspec, 276 int rip_relative_correction) { 277 relocInfo::relocType rtype = (relocInfo::relocType) rspec.type(); 278 279 // Encode the registers as needed in the fields they are used in 280 281 int regenc = encode(reg) << 3; 282 int indexenc = index->is_valid() ? encode(index) << 3 : 0; 283 int baseenc = base->is_valid() ? encode(base) : 0; 284 285 if (base->is_valid()) { 286 if (index->is_valid()) { 287 assert(scale != Address::no_scale, "inconsistent address"); 288 // [base + index*scale + disp] 289 if (disp == 0 && rtype == relocInfo::none && 290 base != rbp LP64_ONLY(&& base != r13)) { 291 // [base + index*scale] 292 // [00 reg 100][ss index base] 293 assert(index != rsp, "illegal addressing mode"); 294 emit_byte(0x04 | regenc); 295 emit_byte(scale << 6 | indexenc | baseenc); 296 } else if (is8bit(disp) && rtype == relocInfo::none) { 297 // [base + index*scale + imm8] 298 // [01 reg 100][ss index base] imm8 299 assert(index != rsp, "illegal addressing mode"); 300 emit_byte(0x44 | regenc); 301 emit_byte(scale << 6 | indexenc | baseenc); 302 emit_byte(disp & 0xFF); 303 } else { 304 // [base + index*scale + disp32] 305 // [10 reg 100][ss index base] disp32 306 assert(index != rsp, "illegal addressing mode"); 307 emit_byte(0x84 | regenc); 308 emit_byte(scale << 6 | indexenc | baseenc); 309 emit_data(disp, rspec, disp32_operand); 310 } 311 } else if (base == rsp LP64_ONLY(|| base == r12)) { 312 // [rsp + disp] 313 if (disp == 0 && rtype == relocInfo::none) { 314 // [rsp] 315 // [00 reg 100][00 100 100] 316 emit_byte(0x04 | regenc); 317 emit_byte(0x24); 318 } else if (is8bit(disp) && rtype == relocInfo::none) { 319 // [rsp + imm8] 320 // [01 reg 100][00 100 100] disp8 321 emit_byte(0x44 | regenc); 322 emit_byte(0x24); 323 emit_byte(disp & 0xFF); 324 } else { 325 // [rsp + imm32] 326 // [10 reg 100][00 100 100] disp32 327 emit_byte(0x84 | regenc); 328 emit_byte(0x24); 329 emit_data(disp, rspec, disp32_operand); 330 } 331 } else { 332 // [base + disp] 333 assert(base != rsp LP64_ONLY(&& base != r12), "illegal addressing mode"); 334 if (disp == 0 && rtype == relocInfo::none && 335 base != rbp LP64_ONLY(&& base != r13)) { 336 // [base] 337 // [00 reg base] 338 emit_byte(0x00 | regenc | baseenc); 339 } else if (is8bit(disp) && rtype == relocInfo::none) { 340 // [base + disp8] 341 // [01 reg base] disp8 342 emit_byte(0x40 | regenc | baseenc); 343 emit_byte(disp & 0xFF); 344 } else { 345 // [base + disp32] 346 // [10 reg base] disp32 347 emit_byte(0x80 | regenc | baseenc); 348 emit_data(disp, rspec, disp32_operand); 349 } 350 } 351 } else { 352 if (index->is_valid()) { 353 assert(scale != Address::no_scale, "inconsistent address"); 354 // [index*scale + disp] 355 // [00 reg 100][ss index 101] disp32 356 assert(index != rsp, "illegal addressing mode"); 357 emit_byte(0x04 | regenc); 358 emit_byte(scale << 6 | indexenc | 0x05); 359 emit_data(disp, rspec, disp32_operand); 360 } else if (rtype != relocInfo::none ) { 361 // [disp] (64bit) RIP-RELATIVE (32bit) abs 362 // [00 000 101] disp32 363 364 emit_byte(0x05 | regenc); 365 // Note that the RIP-rel. correction applies to the generated 366 // disp field, but _not_ to the target address in the rspec. 367 368 // disp was created by converting the target address minus the pc 369 // at the start of the instruction. That needs more correction here. 370 // intptr_t disp = target - next_ip; 371 assert(inst_mark() != NULL, "must be inside InstructionMark"); 372 address next_ip = pc() + sizeof(int32_t) + rip_relative_correction; 373 int64_t adjusted = disp; 374 // Do rip-rel adjustment for 64bit 375 LP64_ONLY(adjusted -= (next_ip - inst_mark())); 376 assert(is_simm32(adjusted), 377 "must be 32bit offset (RIP relative address)"); 378 emit_data((int32_t) adjusted, rspec, disp32_operand); 379 380 } else { 381 // 32bit never did this, did everything as the rip-rel/disp code above 382 // [disp] ABSOLUTE 383 // [00 reg 100][00 100 101] disp32 384 emit_byte(0x04 | regenc); 385 emit_byte(0x25); 386 emit_data(disp, rspec, disp32_operand); 387 } 388 } 389 } 390 391 void Assembler::emit_operand(XMMRegister reg, Register base, Register index, 392 Address::ScaleFactor scale, int disp, 393 RelocationHolder const& rspec) { 394 emit_operand((Register)reg, base, index, scale, disp, rspec); 395 } 396 397 // Secret local extension to Assembler::WhichOperand: 398 #define end_pc_operand (_WhichOperand_limit) 399 400 address Assembler::locate_operand(address inst, WhichOperand which) { 401 // Decode the given instruction, and return the address of 402 // an embedded 32-bit operand word. 403 404 // If "which" is disp32_operand, selects the displacement portion 405 // of an effective address specifier. 406 // If "which" is imm64_operand, selects the trailing immediate constant. 407 // If "which" is call32_operand, selects the displacement of a call or jump. 408 // Caller is responsible for ensuring that there is such an operand, 409 // and that it is 32/64 bits wide. 410 411 // If "which" is end_pc_operand, find the end of the instruction. 412 413 address ip = inst; 414 bool is_64bit = false; 415 416 debug_only(bool has_disp32 = false); 417 int tail_size = 0; // other random bytes (#32, #16, etc.) at end of insn 418 419 again_after_prefix: 420 switch (0xFF & *ip++) { 421 422 // These convenience macros generate groups of "case" labels for the switch. 423 #define REP4(x) (x)+0: case (x)+1: case (x)+2: case (x)+3 424 #define REP8(x) (x)+0: case (x)+1: case (x)+2: case (x)+3: \ 425 case (x)+4: case (x)+5: case (x)+6: case (x)+7 426 #define REP16(x) REP8((x)+0): \ 427 case REP8((x)+8) 428 429 case CS_segment: 430 case SS_segment: 431 case DS_segment: 432 case ES_segment: 433 case FS_segment: 434 case GS_segment: 435 // Seems dubious 436 LP64_ONLY(assert(false, "shouldn't have that prefix")); 437 assert(ip == inst+1, "only one prefix allowed"); 438 goto again_after_prefix; 439 440 case 0x67: 441 case REX: 442 case REX_B: 443 case REX_X: 444 case REX_XB: 445 case REX_R: 446 case REX_RB: 447 case REX_RX: 448 case REX_RXB: 449 NOT_LP64(assert(false, "64bit prefixes")); 450 goto again_after_prefix; 451 452 case REX_W: 453 case REX_WB: 454 case REX_WX: 455 case REX_WXB: 456 case REX_WR: 457 case REX_WRB: 458 case REX_WRX: 459 case REX_WRXB: 460 NOT_LP64(assert(false, "64bit prefixes")); 461 is_64bit = true; 462 goto again_after_prefix; 463 464 case 0xFF: // pushq a; decl a; incl a; call a; jmp a 465 case 0x88: // movb a, r 466 case 0x89: // movl a, r 467 case 0x8A: // movb r, a 468 case 0x8B: // movl r, a 469 case 0x8F: // popl a 470 debug_only(has_disp32 = true); 471 break; 472 473 case 0x68: // pushq #32 474 if (which == end_pc_operand) { 475 return ip + 4; 476 } 477 assert(which == imm_operand && !is_64bit, "pushl has no disp32 or 64bit immediate"); 478 return ip; // not produced by emit_operand 479 480 case 0x66: // movw ... (size prefix) 481 again_after_size_prefix2: 482 switch (0xFF & *ip++) { 483 case REX: 484 case REX_B: 485 case REX_X: 486 case REX_XB: 487 case REX_R: 488 case REX_RB: 489 case REX_RX: 490 case REX_RXB: 491 case REX_W: 492 case REX_WB: 493 case REX_WX: 494 case REX_WXB: 495 case REX_WR: 496 case REX_WRB: 497 case REX_WRX: 498 case REX_WRXB: 499 NOT_LP64(assert(false, "64bit prefix found")); 500 goto again_after_size_prefix2; 501 case 0x8B: // movw r, a 502 case 0x89: // movw a, r 503 debug_only(has_disp32 = true); 504 break; 505 case 0xC7: // movw a, #16 506 debug_only(has_disp32 = true); 507 tail_size = 2; // the imm16 508 break; 509 case 0x0F: // several SSE/SSE2 variants 510 ip--; // reparse the 0x0F 511 goto again_after_prefix; 512 default: 513 ShouldNotReachHere(); 514 } 515 break; 516 517 case REP8(0xB8): // movl/q r, #32/#64(oop?) 518 if (which == end_pc_operand) return ip + (is_64bit ? 8 : 4); 519 // these asserts are somewhat nonsensical 520 #ifndef _LP64 521 assert(which == imm_operand || which == disp32_operand, ""); 522 #else 523 assert((which == call32_operand || which == imm_operand) && is_64bit || 524 which == narrow_oop_operand && !is_64bit, ""); 525 #endif // _LP64 526 return ip; 527 528 case 0x69: // imul r, a, #32 529 case 0xC7: // movl a, #32(oop?) 530 tail_size = 4; 531 debug_only(has_disp32 = true); // has both kinds of operands! 532 break; 533 534 case 0x0F: // movx..., etc. 535 switch (0xFF & *ip++) { 536 case 0x12: // movlps 537 case 0x28: // movaps 538 case 0x2E: // ucomiss 539 case 0x2F: // comiss 540 case 0x54: // andps 541 case 0x55: // andnps 542 case 0x56: // orps 543 case 0x57: // xorps 544 case 0x6E: // movd 545 case 0x7E: // movd 546 case 0xAE: // ldmxcsr a 547 // 64bit side says it these have both operands but that doesn't 548 // appear to be true 549 debug_only(has_disp32 = true); 550 break; 551 552 case 0xAD: // shrd r, a, %cl 553 case 0xAF: // imul r, a 554 case 0xBE: // movsbl r, a (movsxb) 555 case 0xBF: // movswl r, a (movsxw) 556 case 0xB6: // movzbl r, a (movzxb) 557 case 0xB7: // movzwl r, a (movzxw) 558 case REP16(0x40): // cmovl cc, r, a 559 case 0xB0: // cmpxchgb 560 case 0xB1: // cmpxchg 561 case 0xC1: // xaddl 562 case 0xC7: // cmpxchg8 563 case REP16(0x90): // setcc a 564 debug_only(has_disp32 = true); 565 // fall out of the switch to decode the address 566 break; 567 568 case 0xAC: // shrd r, a, #8 569 debug_only(has_disp32 = true); 570 tail_size = 1; // the imm8 571 break; 572 573 case REP16(0x80): // jcc rdisp32 574 if (which == end_pc_operand) return ip + 4; 575 assert(which == call32_operand, "jcc has no disp32 or imm"); 576 return ip; 577 default: 578 ShouldNotReachHere(); 579 } 580 break; 581 582 case 0x81: // addl a, #32; addl r, #32 583 // also: orl, adcl, sbbl, andl, subl, xorl, cmpl 584 // on 32bit in the case of cmpl, the imm might be an oop 585 tail_size = 4; 586 debug_only(has_disp32 = true); // has both kinds of operands! 587 break; 588 589 case 0x83: // addl a, #8; addl r, #8 590 // also: orl, adcl, sbbl, andl, subl, xorl, cmpl 591 debug_only(has_disp32 = true); // has both kinds of operands! 592 tail_size = 1; 593 break; 594 595 case 0x9B: 596 switch (0xFF & *ip++) { 597 case 0xD9: // fnstcw a 598 debug_only(has_disp32 = true); 599 break; 600 default: 601 ShouldNotReachHere(); 602 } 603 break; 604 605 case REP4(0x00): // addb a, r; addl a, r; addb r, a; addl r, a 606 case REP4(0x10): // adc... 607 case REP4(0x20): // and... 608 case REP4(0x30): // xor... 609 case REP4(0x08): // or... 610 case REP4(0x18): // sbb... 611 case REP4(0x28): // sub... 612 case 0xF7: // mull a 613 case 0x8D: // lea r, a 614 case 0x87: // xchg r, a 615 case REP4(0x38): // cmp... 616 case 0x85: // test r, a 617 debug_only(has_disp32 = true); // has both kinds of operands! 618 break; 619 620 case 0xC1: // sal a, #8; sar a, #8; shl a, #8; shr a, #8 621 case 0xC6: // movb a, #8 622 case 0x80: // cmpb a, #8 623 case 0x6B: // imul r, a, #8 624 debug_only(has_disp32 = true); // has both kinds of operands! 625 tail_size = 1; // the imm8 626 break; 627 628 case 0xE8: // call rdisp32 629 case 0xE9: // jmp rdisp32 630 if (which == end_pc_operand) return ip + 4; 631 assert(which == call32_operand, "call has no disp32 or imm"); 632 return ip; 633 634 case 0xD1: // sal a, 1; sar a, 1; shl a, 1; shr a, 1 635 case 0xD3: // sal a, %cl; sar a, %cl; shl a, %cl; shr a, %cl 636 case 0xD9: // fld_s a; fst_s a; fstp_s a; fldcw a 637 case 0xDD: // fld_d a; fst_d a; fstp_d a 638 case 0xDB: // fild_s a; fistp_s a; fld_x a; fstp_x a 639 case 0xDF: // fild_d a; fistp_d a 640 case 0xD8: // fadd_s a; fsubr_s a; fmul_s a; fdivr_s a; fcomp_s a 641 case 0xDC: // fadd_d a; fsubr_d a; fmul_d a; fdivr_d a; fcomp_d a 642 case 0xDE: // faddp_d a; fsubrp_d a; fmulp_d a; fdivrp_d a; fcompp_d a 643 debug_only(has_disp32 = true); 644 break; 645 646 case 0xF0: // Lock 647 assert(os::is_MP(), "only on MP"); 648 goto again_after_prefix; 649 650 case 0xF3: // For SSE 651 case 0xF2: // For SSE2 652 switch (0xFF & *ip++) { 653 case REX: 654 case REX_B: 655 case REX_X: 656 case REX_XB: 657 case REX_R: 658 case REX_RB: 659 case REX_RX: 660 case REX_RXB: 661 case REX_W: 662 case REX_WB: 663 case REX_WX: 664 case REX_WXB: 665 case REX_WR: 666 case REX_WRB: 667 case REX_WRX: 668 case REX_WRXB: 669 NOT_LP64(assert(false, "found 64bit prefix")); 670 ip++; 671 default: 672 ip++; 673 } 674 debug_only(has_disp32 = true); // has both kinds of operands! 675 break; 676 677 default: 678 ShouldNotReachHere(); 679 680 #undef REP8 681 #undef REP16 682 } 683 684 assert(which != call32_operand, "instruction is not a call, jmp, or jcc"); 685 #ifdef _LP64 686 assert(which != imm_operand, "instruction is not a movq reg, imm64"); 687 #else 688 // assert(which != imm_operand || has_imm32, "instruction has no imm32 field"); 689 assert(which != imm_operand || has_disp32, "instruction has no imm32 field"); 690 #endif // LP64 691 assert(which != disp32_operand || has_disp32, "instruction has no disp32 field"); 692 693 // parse the output of emit_operand 694 int op2 = 0xFF & *ip++; 695 int base = op2 & 0x07; 696 int op3 = -1; 697 const int b100 = 4; 698 const int b101 = 5; 699 if (base == b100 && (op2 >> 6) != 3) { 700 op3 = 0xFF & *ip++; 701 base = op3 & 0x07; // refetch the base 702 } 703 // now ip points at the disp (if any) 704 705 switch (op2 >> 6) { 706 case 0: 707 // [00 reg 100][ss index base] 708 // [00 reg 100][00 100 esp] 709 // [00 reg base] 710 // [00 reg 100][ss index 101][disp32] 711 // [00 reg 101] [disp32] 712 713 if (base == b101) { 714 if (which == disp32_operand) 715 return ip; // caller wants the disp32 716 ip += 4; // skip the disp32 717 } 718 break; 719 720 case 1: 721 // [01 reg 100][ss index base][disp8] 722 // [01 reg 100][00 100 esp][disp8] 723 // [01 reg base] [disp8] 724 ip += 1; // skip the disp8 725 break; 726 727 case 2: 728 // [10 reg 100][ss index base][disp32] 729 // [10 reg 100][00 100 esp][disp32] 730 // [10 reg base] [disp32] 731 if (which == disp32_operand) 732 return ip; // caller wants the disp32 733 ip += 4; // skip the disp32 734 break; 735 736 case 3: 737 // [11 reg base] (not a memory addressing mode) 738 break; 739 } 740 741 if (which == end_pc_operand) { 742 return ip + tail_size; 743 } 744 745 #ifdef _LP64 746 assert(which == narrow_oop_operand && !is_64bit, "instruction is not a movl adr, imm32"); 747 #else 748 assert(which == imm_operand, "instruction has only an imm field"); 749 #endif // LP64 750 return ip; 751 } 752 753 address Assembler::locate_next_instruction(address inst) { 754 // Secretly share code with locate_operand: 755 return locate_operand(inst, end_pc_operand); 756 } 757 758 759 #ifdef ASSERT 760 void Assembler::check_relocation(RelocationHolder const& rspec, int format) { 761 address inst = inst_mark(); 762 assert(inst != NULL && inst < pc(), "must point to beginning of instruction"); 763 address opnd; 764 765 Relocation* r = rspec.reloc(); 766 if (r->type() == relocInfo::none) { 767 return; 768 } else if (r->is_call() || format == call32_operand) { 769 // assert(format == imm32_operand, "cannot specify a nonzero format"); 770 opnd = locate_operand(inst, call32_operand); 771 } else if (r->is_data()) { 772 assert(format == imm_operand || format == disp32_operand 773 LP64_ONLY(|| format == narrow_oop_operand), "format ok"); 774 opnd = locate_operand(inst, (WhichOperand)format); 775 } else { 776 assert(format == imm_operand, "cannot specify a format"); 777 return; 778 } 779 assert(opnd == pc(), "must put operand where relocs can find it"); 780 } 781 #endif // ASSERT 782 783 void Assembler::emit_operand32(Register reg, Address adr) { 784 assert(reg->encoding() < 8, "no extended registers"); 785 assert(!adr.base_needs_rex() && !adr.index_needs_rex(), "no extended registers"); 786 emit_operand(reg, adr._base, adr._index, adr._scale, adr._disp, 787 adr._rspec); 788 } 789 790 void Assembler::emit_operand(Register reg, Address adr, 791 int rip_relative_correction) { 792 emit_operand(reg, adr._base, adr._index, adr._scale, adr._disp, 793 adr._rspec, 794 rip_relative_correction); 795 } 796 797 void Assembler::emit_operand(XMMRegister reg, Address adr) { 798 emit_operand(reg, adr._base, adr._index, adr._scale, adr._disp, 799 adr._rspec); 800 } 801 802 // MMX operations 803 void Assembler::emit_operand(MMXRegister reg, Address adr) { 804 assert(!adr.base_needs_rex() && !adr.index_needs_rex(), "no extended registers"); 805 emit_operand((Register)reg, adr._base, adr._index, adr._scale, adr._disp, adr._rspec); 806 } 807 808 // work around gcc (3.2.1-7a) bug 809 void Assembler::emit_operand(Address adr, MMXRegister reg) { 810 assert(!adr.base_needs_rex() && !adr.index_needs_rex(), "no extended registers"); 811 emit_operand((Register)reg, adr._base, adr._index, adr._scale, adr._disp, adr._rspec); 812 } 813 814 815 void Assembler::emit_farith(int b1, int b2, int i) { 816 assert(isByte(b1) && isByte(b2), "wrong opcode"); 817 assert(0 <= i && i < 8, "illegal stack offset"); 818 emit_byte(b1); 819 emit_byte(b2 + i); 820 } 821 822 823 // Now the Assembler instructions (identical for 32/64 bits) 824 825 void Assembler::adcl(Address dst, int32_t imm32) { 826 InstructionMark im(this); 827 prefix(dst); 828 emit_arith_operand(0x81, rdx, dst, imm32); 829 } 830 831 void Assembler::adcl(Address dst, Register src) { 832 InstructionMark im(this); 833 prefix(dst, src); 834 emit_byte(0x11); 835 emit_operand(src, dst); 836 } 837 838 void Assembler::adcl(Register dst, int32_t imm32) { 839 prefix(dst); 840 emit_arith(0x81, 0xD0, dst, imm32); 841 } 842 843 void Assembler::adcl(Register dst, Address src) { 844 InstructionMark im(this); 845 prefix(src, dst); 846 emit_byte(0x13); 847 emit_operand(dst, src); 848 } 849 850 void Assembler::adcl(Register dst, Register src) { 851 (void) prefix_and_encode(dst->encoding(), src->encoding()); 852 emit_arith(0x13, 0xC0, dst, src); 853 } 854 855 void Assembler::addl(Address dst, int32_t imm32) { 856 InstructionMark im(this); 857 prefix(dst); 858 emit_arith_operand(0x81, rax, dst, imm32); 859 } 860 861 void Assembler::addl(Address dst, Register src) { 862 InstructionMark im(this); 863 prefix(dst, src); 864 emit_byte(0x01); 865 emit_operand(src, dst); 866 } 867 868 void Assembler::addl(Register dst, int32_t imm32) { 869 prefix(dst); 870 emit_arith(0x81, 0xC0, dst, imm32); 871 } 872 873 void Assembler::addl(Register dst, Address src) { 874 InstructionMark im(this); 875 prefix(src, dst); 876 emit_byte(0x03); 877 emit_operand(dst, src); 878 } 879 880 void Assembler::addl(Register dst, Register src) { 881 (void) prefix_and_encode(dst->encoding(), src->encoding()); 882 emit_arith(0x03, 0xC0, dst, src); 883 } 884 885 void Assembler::addr_nop_4() { 886 // 4 bytes: NOP DWORD PTR [EAX+0] 887 emit_byte(0x0F); 888 emit_byte(0x1F); 889 emit_byte(0x40); // emit_rm(cbuf, 0x1, EAX_enc, EAX_enc); 890 emit_byte(0); // 8-bits offset (1 byte) 891 } 892 893 void Assembler::addr_nop_5() { 894 // 5 bytes: NOP DWORD PTR [EAX+EAX*0+0] 8-bits offset 895 emit_byte(0x0F); 896 emit_byte(0x1F); 897 emit_byte(0x44); // emit_rm(cbuf, 0x1, EAX_enc, 0x4); 898 emit_byte(0x00); // emit_rm(cbuf, 0x0, EAX_enc, EAX_enc); 899 emit_byte(0); // 8-bits offset (1 byte) 900 } 901 902 void Assembler::addr_nop_7() { 903 // 7 bytes: NOP DWORD PTR [EAX+0] 32-bits offset 904 emit_byte(0x0F); 905 emit_byte(0x1F); 906 emit_byte(0x80); // emit_rm(cbuf, 0x2, EAX_enc, EAX_enc); 907 emit_long(0); // 32-bits offset (4 bytes) 908 } 909 910 void Assembler::addr_nop_8() { 911 // 8 bytes: NOP DWORD PTR [EAX+EAX*0+0] 32-bits offset 912 emit_byte(0x0F); 913 emit_byte(0x1F); 914 emit_byte(0x84); // emit_rm(cbuf, 0x2, EAX_enc, 0x4); 915 emit_byte(0x00); // emit_rm(cbuf, 0x0, EAX_enc, EAX_enc); 916 emit_long(0); // 32-bits offset (4 bytes) 917 } 918 919 void Assembler::addsd(XMMRegister dst, XMMRegister src) { 920 NOT_LP64(assert(VM_Version::supports_sse2(), "")); 921 emit_byte(0xF2); 922 int encode = prefix_and_encode(dst->encoding(), src->encoding()); 923 emit_byte(0x0F); 924 emit_byte(0x58); 925 emit_byte(0xC0 | encode); 926 } 927 928 void Assembler::addsd(XMMRegister dst, Address src) { 929 NOT_LP64(assert(VM_Version::supports_sse2(), "")); 930 InstructionMark im(this); 931 emit_byte(0xF2); 932 prefix(src, dst); 933 emit_byte(0x0F); 934 emit_byte(0x58); 935 emit_operand(dst, src); 936 } 937 938 void Assembler::addss(XMMRegister dst, XMMRegister src) { 939 NOT_LP64(assert(VM_Version::supports_sse(), "")); 940 emit_byte(0xF3); 941 int encode = prefix_and_encode(dst->encoding(), src->encoding()); 942 emit_byte(0x0F); 943 emit_byte(0x58); 944 emit_byte(0xC0 | encode); 945 } 946 947 void Assembler::addss(XMMRegister dst, Address src) { 948 NOT_LP64(assert(VM_Version::supports_sse(), "")); 949 InstructionMark im(this); 950 emit_byte(0xF3); 951 prefix(src, dst); 952 emit_byte(0x0F); 953 emit_byte(0x58); 954 emit_operand(dst, src); 955 } 956 957 void Assembler::andl(Register dst, int32_t imm32) { 958 prefix(dst); 959 emit_arith(0x81, 0xE0, dst, imm32); 960 } 961 962 void Assembler::andl(Register dst, Address src) { 963 InstructionMark im(this); 964 prefix(src, dst); 965 emit_byte(0x23); 966 emit_operand(dst, src); 967 } 968 969 void Assembler::andl(Register dst, Register src) { 970 (void) prefix_and_encode(dst->encoding(), src->encoding()); 971 emit_arith(0x23, 0xC0, dst, src); 972 } 973 974 void Assembler::andpd(XMMRegister dst, Address src) { 975 NOT_LP64(assert(VM_Version::supports_sse2(), "")); 976 InstructionMark im(this); 977 emit_byte(0x66); 978 prefix(src, dst); 979 emit_byte(0x0F); 980 emit_byte(0x54); 981 emit_operand(dst, src); 982 } 983 984 void Assembler::bsfl(Register dst, Register src) { 985 int encode = prefix_and_encode(dst->encoding(), src->encoding()); 986 emit_byte(0x0F); 987 emit_byte(0xBC); 988 emit_byte(0xC0 | encode); 989 } 990 991 void Assembler::bsrl(Register dst, Register src) { 992 assert(!VM_Version::supports_lzcnt(), "encoding is treated as LZCNT"); 993 int encode = prefix_and_encode(dst->encoding(), src->encoding()); 994 emit_byte(0x0F); 995 emit_byte(0xBD); 996 emit_byte(0xC0 | encode); 997 } 998 999 void Assembler::bswapl(Register reg) { // bswap 1000 int encode = prefix_and_encode(reg->encoding()); 1001 emit_byte(0x0F); 1002 emit_byte(0xC8 | encode); 1003 } 1004 1005 void Assembler::call(Label& L, relocInfo::relocType rtype) { 1006 // suspect disp32 is always good 1007 int operand = LP64_ONLY(disp32_operand) NOT_LP64(imm_operand); 1008 1009 if (L.is_bound()) { 1010 const int long_size = 5; 1011 int offs = (int)( target(L) - pc() ); 1012 assert(offs <= 0, "assembler error"); 1013 InstructionMark im(this); 1014 // 1110 1000 #32-bit disp 1015 emit_byte(0xE8); 1016 emit_data(offs - long_size, rtype, operand); 1017 } else { 1018 InstructionMark im(this); 1019 // 1110 1000 #32-bit disp 1020 L.add_patch_at(code(), locator()); 1021 1022 emit_byte(0xE8); 1023 emit_data(int(0), rtype, operand); 1024 } 1025 } 1026 1027 void Assembler::call(Register dst) { 1028 // This was originally using a 32bit register encoding 1029 // and surely we want 64bit! 1030 // this is a 32bit encoding but in 64bit mode the default 1031 // operand size is 64bit so there is no need for the 1032 // wide prefix. So prefix only happens if we use the 1033 // new registers. Much like push/pop. 1034 int x = offset(); 1035 // this may be true but dbx disassembles it as if it 1036 // were 32bits... 1037 // int encode = prefix_and_encode(dst->encoding()); 1038 // if (offset() != x) assert(dst->encoding() >= 8, "what?"); 1039 int encode = prefixq_and_encode(dst->encoding()); 1040 1041 emit_byte(0xFF); 1042 emit_byte(0xD0 | encode); 1043 } 1044 1045 1046 void Assembler::call(Address adr) { 1047 InstructionMark im(this); 1048 prefix(adr); 1049 emit_byte(0xFF); 1050 emit_operand(rdx, adr); 1051 } 1052 1053 void Assembler::call_literal(address entry, RelocationHolder const& rspec) { 1054 assert(entry != NULL, "call most probably wrong"); 1055 InstructionMark im(this); 1056 emit_byte(0xE8); 1057 intptr_t disp = entry - (_code_pos + sizeof(int32_t)); 1058 assert(is_simm32(disp), "must be 32bit offset (call2)"); 1059 // Technically, should use call32_operand, but this format is 1060 // implied by the fact that we're emitting a call instruction. 1061 1062 int operand = LP64_ONLY(disp32_operand) NOT_LP64(call32_operand); 1063 emit_data((int) disp, rspec, operand); 1064 } 1065 1066 void Assembler::cdql() { 1067 emit_byte(0x99); 1068 } 1069 1070 void Assembler::cmovl(Condition cc, Register dst, Register src) { 1071 NOT_LP64(guarantee(VM_Version::supports_cmov(), "illegal instruction")); 1072 int encode = prefix_and_encode(dst->encoding(), src->encoding()); 1073 emit_byte(0x0F); 1074 emit_byte(0x40 | cc); 1075 emit_byte(0xC0 | encode); 1076 } 1077 1078 1079 void Assembler::cmovl(Condition cc, Register dst, Address src) { 1080 NOT_LP64(guarantee(VM_Version::supports_cmov(), "illegal instruction")); 1081 prefix(src, dst); 1082 emit_byte(0x0F); 1083 emit_byte(0x40 | cc); 1084 emit_operand(dst, src); 1085 } 1086 1087 void Assembler::cmpb(Address dst, int imm8) { 1088 InstructionMark im(this); 1089 prefix(dst); 1090 emit_byte(0x80); 1091 emit_operand(rdi, dst, 1); 1092 emit_byte(imm8); 1093 } 1094 1095 void Assembler::cmpl(Address dst, int32_t imm32) { 1096 InstructionMark im(this); 1097 prefix(dst); 1098 emit_byte(0x81); 1099 emit_operand(rdi, dst, 4); 1100 emit_long(imm32); 1101 } 1102 1103 void Assembler::cmpl(Register dst, int32_t imm32) { 1104 prefix(dst); 1105 emit_arith(0x81, 0xF8, dst, imm32); 1106 } 1107 1108 void Assembler::cmpl(Register dst, Register src) { 1109 (void) prefix_and_encode(dst->encoding(), src->encoding()); 1110 emit_arith(0x3B, 0xC0, dst, src); 1111 } 1112 1113 1114 void Assembler::cmpl(Register dst, Address src) { 1115 InstructionMark im(this); 1116 prefix(src, dst); 1117 emit_byte(0x3B); 1118 emit_operand(dst, src); 1119 } 1120 1121 void Assembler::cmpw(Address dst, int imm16) { 1122 InstructionMark im(this); 1123 assert(!dst.base_needs_rex() && !dst.index_needs_rex(), "no extended registers"); 1124 emit_byte(0x66); 1125 emit_byte(0x81); 1126 emit_operand(rdi, dst, 2); 1127 emit_word(imm16); 1128 } 1129 1130 // The 32-bit cmpxchg compares the value at adr with the contents of rax, 1131 // and stores reg into adr if so; otherwise, the value at adr is loaded into rax,. 1132 // The ZF is set if the compared values were equal, and cleared otherwise. 1133 void Assembler::cmpxchgl(Register reg, Address adr) { // cmpxchg 1134 if (Atomics & 2) { 1135 // caveat: no instructionmark, so this isn't relocatable. 1136 // Emit a synthetic, non-atomic, CAS equivalent. 1137 // Beware. The synthetic form sets all ICCs, not just ZF. 1138 // cmpxchg r,[m] is equivalent to rax, = CAS (m, rax, r) 1139 cmpl(rax, adr); 1140 movl(rax, adr); 1141 if (reg != rax) { 1142 Label L ; 1143 jcc(Assembler::notEqual, L); 1144 movl(adr, reg); 1145 bind(L); 1146 } 1147 } else { 1148 InstructionMark im(this); 1149 prefix(adr, reg); 1150 emit_byte(0x0F); 1151 emit_byte(0xB1); 1152 emit_operand(reg, adr); 1153 } 1154 } 1155 1156 void Assembler::comisd(XMMRegister dst, Address src) { 1157 // NOTE: dbx seems to decode this as comiss even though the 1158 // 0x66 is there. Strangly ucomisd comes out correct 1159 NOT_LP64(assert(VM_Version::supports_sse2(), "")); 1160 emit_byte(0x66); 1161 comiss(dst, src); 1162 } 1163 1164 void Assembler::comiss(XMMRegister dst, Address src) { 1165 NOT_LP64(assert(VM_Version::supports_sse(), "")); 1166 1167 InstructionMark im(this); 1168 prefix(src, dst); 1169 emit_byte(0x0F); 1170 emit_byte(0x2F); 1171 emit_operand(dst, src); 1172 } 1173 1174 void Assembler::cvtdq2pd(XMMRegister dst, XMMRegister src) { 1175 NOT_LP64(assert(VM_Version::supports_sse2(), "")); 1176 emit_byte(0xF3); 1177 int encode = prefix_and_encode(dst->encoding(), src->encoding()); 1178 emit_byte(0x0F); 1179 emit_byte(0xE6); 1180 emit_byte(0xC0 | encode); 1181 } 1182 1183 void Assembler::cvtdq2ps(XMMRegister dst, XMMRegister src) { 1184 NOT_LP64(assert(VM_Version::supports_sse2(), "")); 1185 int encode = prefix_and_encode(dst->encoding(), src->encoding()); 1186 emit_byte(0x0F); 1187 emit_byte(0x5B); 1188 emit_byte(0xC0 | encode); 1189 } 1190 1191 void Assembler::cvtsd2ss(XMMRegister dst, XMMRegister src) { 1192 NOT_LP64(assert(VM_Version::supports_sse2(), "")); 1193 emit_byte(0xF2); 1194 int encode = prefix_and_encode(dst->encoding(), src->encoding()); 1195 emit_byte(0x0F); 1196 emit_byte(0x5A); 1197 emit_byte(0xC0 | encode); 1198 } 1199 1200 void Assembler::cvtsi2sdl(XMMRegister dst, Register src) { 1201 NOT_LP64(assert(VM_Version::supports_sse2(), "")); 1202 emit_byte(0xF2); 1203 int encode = prefix_and_encode(dst->encoding(), src->encoding()); 1204 emit_byte(0x0F); 1205 emit_byte(0x2A); 1206 emit_byte(0xC0 | encode); 1207 } 1208 1209 void Assembler::cvtsi2ssl(XMMRegister dst, Register src) { 1210 NOT_LP64(assert(VM_Version::supports_sse(), "")); 1211 emit_byte(0xF3); 1212 int encode = prefix_and_encode(dst->encoding(), src->encoding()); 1213 emit_byte(0x0F); 1214 emit_byte(0x2A); 1215 emit_byte(0xC0 | encode); 1216 } 1217 1218 void Assembler::cvtss2sd(XMMRegister dst, XMMRegister src) { 1219 NOT_LP64(assert(VM_Version::supports_sse2(), "")); 1220 emit_byte(0xF3); 1221 int encode = prefix_and_encode(dst->encoding(), src->encoding()); 1222 emit_byte(0x0F); 1223 emit_byte(0x5A); 1224 emit_byte(0xC0 | encode); 1225 } 1226 1227 void Assembler::cvttsd2sil(Register dst, XMMRegister src) { 1228 NOT_LP64(assert(VM_Version::supports_sse2(), "")); 1229 emit_byte(0xF2); 1230 int encode = prefix_and_encode(dst->encoding(), src->encoding()); 1231 emit_byte(0x0F); 1232 emit_byte(0x2C); 1233 emit_byte(0xC0 | encode); 1234 } 1235 1236 void Assembler::cvttss2sil(Register dst, XMMRegister src) { 1237 NOT_LP64(assert(VM_Version::supports_sse(), "")); 1238 emit_byte(0xF3); 1239 int encode = prefix_and_encode(dst->encoding(), src->encoding()); 1240 emit_byte(0x0F); 1241 emit_byte(0x2C); 1242 emit_byte(0xC0 | encode); 1243 } 1244 1245 void Assembler::decl(Address dst) { 1246 // Don't use it directly. Use MacroAssembler::decrement() instead. 1247 InstructionMark im(this); 1248 prefix(dst); 1249 emit_byte(0xFF); 1250 emit_operand(rcx, dst); 1251 } 1252 1253 void Assembler::divsd(XMMRegister dst, Address src) { 1254 NOT_LP64(assert(VM_Version::supports_sse2(), "")); 1255 InstructionMark im(this); 1256 emit_byte(0xF2); 1257 prefix(src, dst); 1258 emit_byte(0x0F); 1259 emit_byte(0x5E); 1260 emit_operand(dst, src); 1261 } 1262 1263 void Assembler::divsd(XMMRegister dst, XMMRegister src) { 1264 NOT_LP64(assert(VM_Version::supports_sse2(), "")); 1265 emit_byte(0xF2); 1266 int encode = prefix_and_encode(dst->encoding(), src->encoding()); 1267 emit_byte(0x0F); 1268 emit_byte(0x5E); 1269 emit_byte(0xC0 | encode); 1270 } 1271 1272 void Assembler::divss(XMMRegister dst, Address src) { 1273 NOT_LP64(assert(VM_Version::supports_sse(), "")); 1274 InstructionMark im(this); 1275 emit_byte(0xF3); 1276 prefix(src, dst); 1277 emit_byte(0x0F); 1278 emit_byte(0x5E); 1279 emit_operand(dst, src); 1280 } 1281 1282 void Assembler::divss(XMMRegister dst, XMMRegister src) { 1283 NOT_LP64(assert(VM_Version::supports_sse(), "")); 1284 emit_byte(0xF3); 1285 int encode = prefix_and_encode(dst->encoding(), src->encoding()); 1286 emit_byte(0x0F); 1287 emit_byte(0x5E); 1288 emit_byte(0xC0 | encode); 1289 } 1290 1291 void Assembler::emms() { 1292 NOT_LP64(assert(VM_Version::supports_mmx(), "")); 1293 emit_byte(0x0F); 1294 emit_byte(0x77); 1295 } 1296 1297 void Assembler::hlt() { 1298 emit_byte(0xF4); 1299 } 1300 1301 void Assembler::idivl(Register src) { 1302 int encode = prefix_and_encode(src->encoding()); 1303 emit_byte(0xF7); 1304 emit_byte(0xF8 | encode); 1305 } 1306 1307 void Assembler::divl(Register src) { // Unsigned 1308 int encode = prefix_and_encode(src->encoding()); 1309 emit_byte(0xF7); 1310 emit_byte(0xF0 | encode); 1311 } 1312 1313 void Assembler::imull(Register dst, Register src) { 1314 int encode = prefix_and_encode(dst->encoding(), src->encoding()); 1315 emit_byte(0x0F); 1316 emit_byte(0xAF); 1317 emit_byte(0xC0 | encode); 1318 } 1319 1320 1321 void Assembler::imull(Register dst, Register src, int value) { 1322 int encode = prefix_and_encode(dst->encoding(), src->encoding()); 1323 if (is8bit(value)) { 1324 emit_byte(0x6B); 1325 emit_byte(0xC0 | encode); 1326 emit_byte(value & 0xFF); 1327 } else { 1328 emit_byte(0x69); 1329 emit_byte(0xC0 | encode); 1330 emit_long(value); 1331 } 1332 } 1333 1334 void Assembler::incl(Address dst) { 1335 // Don't use it directly. Use MacroAssembler::increment() instead. 1336 InstructionMark im(this); 1337 prefix(dst); 1338 emit_byte(0xFF); 1339 emit_operand(rax, dst); 1340 } 1341 1342 void Assembler::jcc(Condition cc, Label& L, bool maybe_short) { 1343 InstructionMark im(this); 1344 assert((0 <= cc) && (cc < 16), "illegal cc"); 1345 if (L.is_bound()) { 1346 address dst = target(L); 1347 assert(dst != NULL, "jcc most probably wrong"); 1348 1349 const int short_size = 2; 1350 const int long_size = 6; 1351 intptr_t offs = (intptr_t)dst - (intptr_t)_code_pos; 1352 if (maybe_short && is8bit(offs - short_size)) { 1353 // 0111 tttn #8-bit disp 1354 emit_byte(0x70 | cc); 1355 emit_byte((offs - short_size) & 0xFF); 1356 } else { 1357 // 0000 1111 1000 tttn #32-bit disp 1358 assert(is_simm32(offs - long_size), 1359 "must be 32bit offset (call4)"); 1360 emit_byte(0x0F); 1361 emit_byte(0x80 | cc); 1362 emit_long(offs - long_size); 1363 } 1364 } else { 1365 // Note: could eliminate cond. jumps to this jump if condition 1366 // is the same however, seems to be rather unlikely case. 1367 // Note: use jccb() if label to be bound is very close to get 1368 // an 8-bit displacement 1369 L.add_patch_at(code(), locator()); 1370 emit_byte(0x0F); 1371 emit_byte(0x80 | cc); 1372 emit_long(0); 1373 } 1374 } 1375 1376 void Assembler::jccb(Condition cc, Label& L) { 1377 if (L.is_bound()) { 1378 const int short_size = 2; 1379 address entry = target(L); 1380 assert(is8bit((intptr_t)entry - ((intptr_t)_code_pos + short_size)), 1381 "Dispacement too large for a short jmp"); 1382 intptr_t offs = (intptr_t)entry - (intptr_t)_code_pos; 1383 // 0111 tttn #8-bit disp 1384 emit_byte(0x70 | cc); 1385 emit_byte((offs - short_size) & 0xFF); 1386 } else { 1387 InstructionMark im(this); 1388 L.add_patch_at(code(), locator()); 1389 emit_byte(0x70 | cc); 1390 emit_byte(0); 1391 } 1392 } 1393 1394 void Assembler::jmp(Address adr) { 1395 InstructionMark im(this); 1396 prefix(adr); 1397 emit_byte(0xFF); 1398 emit_operand(rsp, adr); 1399 } 1400 1401 void Assembler::jmp(Label& L, bool maybe_short) { 1402 if (L.is_bound()) { 1403 address entry = target(L); 1404 assert(entry != NULL, "jmp most probably wrong"); 1405 InstructionMark im(this); 1406 const int short_size = 2; 1407 const int long_size = 5; 1408 intptr_t offs = entry - _code_pos; 1409 if (maybe_short && is8bit(offs - short_size)) { 1410 emit_byte(0xEB); 1411 emit_byte((offs - short_size) & 0xFF); 1412 } else { 1413 emit_byte(0xE9); 1414 emit_long(offs - long_size); 1415 } 1416 } else { 1417 // By default, forward jumps are always 32-bit displacements, since 1418 // we can't yet know where the label will be bound. If you're sure that 1419 // the forward jump will not run beyond 256 bytes, use jmpb to 1420 // force an 8-bit displacement. 1421 InstructionMark im(this); 1422 L.add_patch_at(code(), locator()); 1423 emit_byte(0xE9); 1424 emit_long(0); 1425 } 1426 } 1427 1428 void Assembler::jmp(Register entry) { 1429 int encode = prefix_and_encode(entry->encoding()); 1430 emit_byte(0xFF); 1431 emit_byte(0xE0 | encode); 1432 } 1433 1434 void Assembler::jmp_literal(address dest, RelocationHolder const& rspec) { 1435 InstructionMark im(this); 1436 emit_byte(0xE9); 1437 assert(dest != NULL, "must have a target"); 1438 intptr_t disp = dest - (_code_pos + sizeof(int32_t)); 1439 assert(is_simm32(disp), "must be 32bit offset (jmp)"); 1440 emit_data(disp, rspec.reloc(), call32_operand); 1441 } 1442 1443 void Assembler::jmpb(Label& L) { 1444 if (L.is_bound()) { 1445 const int short_size = 2; 1446 address entry = target(L); 1447 assert(is8bit((entry - _code_pos) + short_size), 1448 "Dispacement too large for a short jmp"); 1449 assert(entry != NULL, "jmp most probably wrong"); 1450 intptr_t offs = entry - _code_pos; 1451 emit_byte(0xEB); 1452 emit_byte((offs - short_size) & 0xFF); 1453 } else { 1454 InstructionMark im(this); 1455 L.add_patch_at(code(), locator()); 1456 emit_byte(0xEB); 1457 emit_byte(0); 1458 } 1459 } 1460 1461 void Assembler::ldmxcsr( Address src) { 1462 NOT_LP64(assert(VM_Version::supports_sse(), "")); 1463 InstructionMark im(this); 1464 prefix(src); 1465 emit_byte(0x0F); 1466 emit_byte(0xAE); 1467 emit_operand(as_Register(2), src); 1468 } 1469 1470 void Assembler::leal(Register dst, Address src) { 1471 InstructionMark im(this); 1472 #ifdef _LP64 1473 emit_byte(0x67); // addr32 1474 prefix(src, dst); 1475 #endif // LP64 1476 emit_byte(0x8D); 1477 emit_operand(dst, src); 1478 } 1479 1480 void Assembler::lock() { 1481 if (Atomics & 1) { 1482 // Emit either nothing, a NOP, or a NOP: prefix 1483 emit_byte(0x90) ; 1484 } else { 1485 emit_byte(0xF0); 1486 } 1487 } 1488 1489 void Assembler::lzcntl(Register dst, Register src) { 1490 assert(VM_Version::supports_lzcnt(), "encoding is treated as BSR"); 1491 emit_byte(0xF3); 1492 int encode = prefix_and_encode(dst->encoding(), src->encoding()); 1493 emit_byte(0x0F); 1494 emit_byte(0xBD); 1495 emit_byte(0xC0 | encode); 1496 } 1497 1498 // Emit mfence instruction 1499 void Assembler::mfence() { 1500 NOT_LP64(assert(VM_Version::supports_sse2(), "unsupported");) 1501 emit_byte( 0x0F ); 1502 emit_byte( 0xAE ); 1503 emit_byte( 0xF0 ); 1504 } 1505 1506 void Assembler::mov(Register dst, Register src) { 1507 LP64_ONLY(movq(dst, src)) NOT_LP64(movl(dst, src)); 1508 } 1509 1510 void Assembler::movapd(XMMRegister dst, XMMRegister src) { 1511 NOT_LP64(assert(VM_Version::supports_sse2(), "")); 1512 int dstenc = dst->encoding(); 1513 int srcenc = src->encoding(); 1514 emit_byte(0x66); 1515 if (dstenc < 8) { 1516 if (srcenc >= 8) { 1517 prefix(REX_B); 1518 srcenc -= 8; 1519 } 1520 } else { 1521 if (srcenc < 8) { 1522 prefix(REX_R); 1523 } else { 1524 prefix(REX_RB); 1525 srcenc -= 8; 1526 } 1527 dstenc -= 8; 1528 } 1529 emit_byte(0x0F); 1530 emit_byte(0x28); 1531 emit_byte(0xC0 | dstenc << 3 | srcenc); 1532 } 1533 1534 void Assembler::movaps(XMMRegister dst, XMMRegister src) { 1535 NOT_LP64(assert(VM_Version::supports_sse(), "")); 1536 int dstenc = dst->encoding(); 1537 int srcenc = src->encoding(); 1538 if (dstenc < 8) { 1539 if (srcenc >= 8) { 1540 prefix(REX_B); 1541 srcenc -= 8; 1542 } 1543 } else { 1544 if (srcenc < 8) { 1545 prefix(REX_R); 1546 } else { 1547 prefix(REX_RB); 1548 srcenc -= 8; 1549 } 1550 dstenc -= 8; 1551 } 1552 emit_byte(0x0F); 1553 emit_byte(0x28); 1554 emit_byte(0xC0 | dstenc << 3 | srcenc); 1555 } 1556 1557 void Assembler::movb(Register dst, Address src) { 1558 NOT_LP64(assert(dst->has_byte_register(), "must have byte register")); 1559 InstructionMark im(this); 1560 prefix(src, dst, true); 1561 emit_byte(0x8A); 1562 emit_operand(dst, src); 1563 } 1564 1565 1566 void Assembler::movb(Address dst, int imm8) { 1567 InstructionMark im(this); 1568 prefix(dst); 1569 emit_byte(0xC6); 1570 emit_operand(rax, dst, 1); 1571 emit_byte(imm8); 1572 } 1573 1574 1575 void Assembler::movb(Address dst, Register src) { 1576 assert(src->has_byte_register(), "must have byte register"); 1577 InstructionMark im(this); 1578 prefix(dst, src, true); 1579 emit_byte(0x88); 1580 emit_operand(src, dst); 1581 } 1582 1583 void Assembler::movdl(XMMRegister dst, Register src) { 1584 NOT_LP64(assert(VM_Version::supports_sse2(), "")); 1585 emit_byte(0x66); 1586 int encode = prefix_and_encode(dst->encoding(), src->encoding()); 1587 emit_byte(0x0F); 1588 emit_byte(0x6E); 1589 emit_byte(0xC0 | encode); 1590 } 1591 1592 void Assembler::movdl(Register dst, XMMRegister src) { 1593 NOT_LP64(assert(VM_Version::supports_sse2(), "")); 1594 emit_byte(0x66); 1595 // swap src/dst to get correct prefix 1596 int encode = prefix_and_encode(src->encoding(), dst->encoding()); 1597 emit_byte(0x0F); 1598 emit_byte(0x7E); 1599 emit_byte(0xC0 | encode); 1600 } 1601 1602 void Assembler::movdl(XMMRegister dst, Address src) { 1603 NOT_LP64(assert(VM_Version::supports_sse2(), "")); 1604 InstructionMark im(this); 1605 emit_byte(0x66); 1606 prefix(src, dst); 1607 emit_byte(0x0F); 1608 emit_byte(0x6E); 1609 emit_operand(dst, src); 1610 } 1611 1612 1613 void Assembler::movdqa(XMMRegister dst, Address src) { 1614 NOT_LP64(assert(VM_Version::supports_sse2(), "")); 1615 InstructionMark im(this); 1616 emit_byte(0x66); 1617 prefix(src, dst); 1618 emit_byte(0x0F); 1619 emit_byte(0x6F); 1620 emit_operand(dst, src); 1621 } 1622 1623 void Assembler::movdqa(XMMRegister dst, XMMRegister src) { 1624 NOT_LP64(assert(VM_Version::supports_sse2(), "")); 1625 emit_byte(0x66); 1626 int encode = prefixq_and_encode(dst->encoding(), src->encoding()); 1627 emit_byte(0x0F); 1628 emit_byte(0x6F); 1629 emit_byte(0xC0 | encode); 1630 } 1631 1632 void Assembler::movdqa(Address dst, XMMRegister src) { 1633 NOT_LP64(assert(VM_Version::supports_sse2(), "")); 1634 InstructionMark im(this); 1635 emit_byte(0x66); 1636 prefix(dst, src); 1637 emit_byte(0x0F); 1638 emit_byte(0x7F); 1639 emit_operand(src, dst); 1640 } 1641 1642 void Assembler::movdqu(XMMRegister dst, Address src) { 1643 NOT_LP64(assert(VM_Version::supports_sse2(), "")); 1644 InstructionMark im(this); 1645 emit_byte(0xF3); 1646 prefix(src, dst); 1647 emit_byte(0x0F); 1648 emit_byte(0x6F); 1649 emit_operand(dst, src); 1650 } 1651 1652 void Assembler::movdqu(XMMRegister dst, XMMRegister src) { 1653 NOT_LP64(assert(VM_Version::supports_sse2(), "")); 1654 emit_byte(0xF3); 1655 int encode = prefixq_and_encode(dst->encoding(), src->encoding()); 1656 emit_byte(0x0F); 1657 emit_byte(0x6F); 1658 emit_byte(0xC0 | encode); 1659 } 1660 1661 void Assembler::movdqu(Address dst, XMMRegister src) { 1662 NOT_LP64(assert(VM_Version::supports_sse2(), "")); 1663 InstructionMark im(this); 1664 emit_byte(0xF3); 1665 prefix(dst, src); 1666 emit_byte(0x0F); 1667 emit_byte(0x7F); 1668 emit_operand(src, dst); 1669 } 1670 1671 // Uses zero extension on 64bit 1672 1673 void Assembler::movl(Register dst, int32_t imm32) { 1674 int encode = prefix_and_encode(dst->encoding()); 1675 emit_byte(0xB8 | encode); 1676 emit_long(imm32); 1677 } 1678 1679 void Assembler::movl(Register dst, Register src) { 1680 int encode = prefix_and_encode(dst->encoding(), src->encoding()); 1681 emit_byte(0x8B); 1682 emit_byte(0xC0 | encode); 1683 } 1684 1685 void Assembler::movl(Register dst, Address src) { 1686 InstructionMark im(this); 1687 prefix(src, dst); 1688 emit_byte(0x8B); 1689 emit_operand(dst, src); 1690 } 1691 1692 void Assembler::movl(Address dst, int32_t imm32) { 1693 InstructionMark im(this); 1694 prefix(dst); 1695 emit_byte(0xC7); 1696 emit_operand(rax, dst, 4); 1697 emit_long(imm32); 1698 } 1699 1700 void Assembler::movl(Address dst, Register src) { 1701 InstructionMark im(this); 1702 prefix(dst, src); 1703 emit_byte(0x89); 1704 emit_operand(src, dst); 1705 } 1706 1707 // New cpus require to use movsd and movss to avoid partial register stall 1708 // when loading from memory. But for old Opteron use movlpd instead of movsd. 1709 // The selection is done in MacroAssembler::movdbl() and movflt(). 1710 void Assembler::movlpd(XMMRegister dst, Address src) { 1711 NOT_LP64(assert(VM_Version::supports_sse2(), "")); 1712 InstructionMark im(this); 1713 emit_byte(0x66); 1714 prefix(src, dst); 1715 emit_byte(0x0F); 1716 emit_byte(0x12); 1717 emit_operand(dst, src); 1718 } 1719 1720 void Assembler::movq( MMXRegister dst, Address src ) { 1721 assert( VM_Version::supports_mmx(), "" ); 1722 emit_byte(0x0F); 1723 emit_byte(0x6F); 1724 emit_operand(dst, src); 1725 } 1726 1727 void Assembler::movq( Address dst, MMXRegister src ) { 1728 assert( VM_Version::supports_mmx(), "" ); 1729 emit_byte(0x0F); 1730 emit_byte(0x7F); 1731 // workaround gcc (3.2.1-7a) bug 1732 // In that version of gcc with only an emit_operand(MMX, Address) 1733 // gcc will tail jump and try and reverse the parameters completely 1734 // obliterating dst in the process. By having a version available 1735 // that doesn't need to swap the args at the tail jump the bug is 1736 // avoided. 1737 emit_operand(dst, src); 1738 } 1739 1740 void Assembler::movq(XMMRegister dst, Address src) { 1741 NOT_LP64(assert(VM_Version::supports_sse2(), "")); 1742 InstructionMark im(this); 1743 emit_byte(0xF3); 1744 prefix(src, dst); 1745 emit_byte(0x0F); 1746 emit_byte(0x7E); 1747 emit_operand(dst, src); 1748 } 1749 1750 void Assembler::movq(Address dst, XMMRegister src) { 1751 NOT_LP64(assert(VM_Version::supports_sse2(), "")); 1752 InstructionMark im(this); 1753 emit_byte(0x66); 1754 prefix(dst, src); 1755 emit_byte(0x0F); 1756 emit_byte(0xD6); 1757 emit_operand(src, dst); 1758 } 1759 1760 void Assembler::movsbl(Register dst, Address src) { // movsxb 1761 InstructionMark im(this); 1762 prefix(src, dst); 1763 emit_byte(0x0F); 1764 emit_byte(0xBE); 1765 emit_operand(dst, src); 1766 } 1767 1768 void Assembler::movsbl(Register dst, Register src) { // movsxb 1769 NOT_LP64(assert(src->has_byte_register(), "must have byte register")); 1770 int encode = prefix_and_encode(dst->encoding(), src->encoding(), true); 1771 emit_byte(0x0F); 1772 emit_byte(0xBE); 1773 emit_byte(0xC0 | encode); 1774 } 1775 1776 void Assembler::movsd(XMMRegister dst, XMMRegister src) { 1777 NOT_LP64(assert(VM_Version::supports_sse2(), "")); 1778 emit_byte(0xF2); 1779 int encode = prefix_and_encode(dst->encoding(), src->encoding()); 1780 emit_byte(0x0F); 1781 emit_byte(0x10); 1782 emit_byte(0xC0 | encode); 1783 } 1784 1785 void Assembler::movsd(XMMRegister dst, Address src) { 1786 NOT_LP64(assert(VM_Version::supports_sse2(), "")); 1787 InstructionMark im(this); 1788 emit_byte(0xF2); 1789 prefix(src, dst); 1790 emit_byte(0x0F); 1791 emit_byte(0x10); 1792 emit_operand(dst, src); 1793 } 1794 1795 void Assembler::movsd(Address dst, XMMRegister src) { 1796 NOT_LP64(assert(VM_Version::supports_sse2(), "")); 1797 InstructionMark im(this); 1798 emit_byte(0xF2); 1799 prefix(dst, src); 1800 emit_byte(0x0F); 1801 emit_byte(0x11); 1802 emit_operand(src, dst); 1803 } 1804 1805 void Assembler::movss(XMMRegister dst, XMMRegister src) { 1806 NOT_LP64(assert(VM_Version::supports_sse(), "")); 1807 emit_byte(0xF3); 1808 int encode = prefix_and_encode(dst->encoding(), src->encoding()); 1809 emit_byte(0x0F); 1810 emit_byte(0x10); 1811 emit_byte(0xC0 | encode); 1812 } 1813 1814 void Assembler::movss(XMMRegister dst, Address src) { 1815 NOT_LP64(assert(VM_Version::supports_sse(), "")); 1816 InstructionMark im(this); 1817 emit_byte(0xF3); 1818 prefix(src, dst); 1819 emit_byte(0x0F); 1820 emit_byte(0x10); 1821 emit_operand(dst, src); 1822 } 1823 1824 void Assembler::movss(Address dst, XMMRegister src) { 1825 NOT_LP64(assert(VM_Version::supports_sse(), "")); 1826 InstructionMark im(this); 1827 emit_byte(0xF3); 1828 prefix(dst, src); 1829 emit_byte(0x0F); 1830 emit_byte(0x11); 1831 emit_operand(src, dst); 1832 } 1833 1834 void Assembler::movswl(Register dst, Address src) { // movsxw 1835 InstructionMark im(this); 1836 prefix(src, dst); 1837 emit_byte(0x0F); 1838 emit_byte(0xBF); 1839 emit_operand(dst, src); 1840 } 1841 1842 void Assembler::movswl(Register dst, Register src) { // movsxw 1843 int encode = prefix_and_encode(dst->encoding(), src->encoding()); 1844 emit_byte(0x0F); 1845 emit_byte(0xBF); 1846 emit_byte(0xC0 | encode); 1847 } 1848 1849 void Assembler::movw(Address dst, int imm16) { 1850 InstructionMark im(this); 1851 1852 emit_byte(0x66); // switch to 16-bit mode 1853 prefix(dst); 1854 emit_byte(0xC7); 1855 emit_operand(rax, dst, 2); 1856 emit_word(imm16); 1857 } 1858 1859 void Assembler::movw(Register dst, Address src) { 1860 InstructionMark im(this); 1861 emit_byte(0x66); 1862 prefix(src, dst); 1863 emit_byte(0x8B); 1864 emit_operand(dst, src); 1865 } 1866 1867 void Assembler::movw(Address dst, Register src) { 1868 InstructionMark im(this); 1869 emit_byte(0x66); 1870 prefix(dst, src); 1871 emit_byte(0x89); 1872 emit_operand(src, dst); 1873 } 1874 1875 void Assembler::movzbl(Register dst, Address src) { // movzxb 1876 InstructionMark im(this); 1877 prefix(src, dst); 1878 emit_byte(0x0F); 1879 emit_byte(0xB6); 1880 emit_operand(dst, src); 1881 } 1882 1883 void Assembler::movzbl(Register dst, Register src) { // movzxb 1884 NOT_LP64(assert(src->has_byte_register(), "must have byte register")); 1885 int encode = prefix_and_encode(dst->encoding(), src->encoding(), true); 1886 emit_byte(0x0F); 1887 emit_byte(0xB6); 1888 emit_byte(0xC0 | encode); 1889 } 1890 1891 void Assembler::movzwl(Register dst, Address src) { // movzxw 1892 InstructionMark im(this); 1893 prefix(src, dst); 1894 emit_byte(0x0F); 1895 emit_byte(0xB7); 1896 emit_operand(dst, src); 1897 } 1898 1899 void Assembler::movzwl(Register dst, Register src) { // movzxw 1900 int encode = prefix_and_encode(dst->encoding(), src->encoding()); 1901 emit_byte(0x0F); 1902 emit_byte(0xB7); 1903 emit_byte(0xC0 | encode); 1904 } 1905 1906 void Assembler::mull(Address src) { 1907 InstructionMark im(this); 1908 prefix(src); 1909 emit_byte(0xF7); 1910 emit_operand(rsp, src); 1911 } 1912 1913 void Assembler::mull(Register src) { 1914 int encode = prefix_and_encode(src->encoding()); 1915 emit_byte(0xF7); 1916 emit_byte(0xE0 | encode); 1917 } 1918 1919 void Assembler::mulsd(XMMRegister dst, Address src) { 1920 NOT_LP64(assert(VM_Version::supports_sse2(), "")); 1921 InstructionMark im(this); 1922 emit_byte(0xF2); 1923 prefix(src, dst); 1924 emit_byte(0x0F); 1925 emit_byte(0x59); 1926 emit_operand(dst, src); 1927 } 1928 1929 void Assembler::mulsd(XMMRegister dst, XMMRegister src) { 1930 NOT_LP64(assert(VM_Version::supports_sse2(), "")); 1931 emit_byte(0xF2); 1932 int encode = prefix_and_encode(dst->encoding(), src->encoding()); 1933 emit_byte(0x0F); 1934 emit_byte(0x59); 1935 emit_byte(0xC0 | encode); 1936 } 1937 1938 void Assembler::mulss(XMMRegister dst, Address src) { 1939 NOT_LP64(assert(VM_Version::supports_sse(), "")); 1940 InstructionMark im(this); 1941 emit_byte(0xF3); 1942 prefix(src, dst); 1943 emit_byte(0x0F); 1944 emit_byte(0x59); 1945 emit_operand(dst, src); 1946 } 1947 1948 void Assembler::mulss(XMMRegister dst, XMMRegister src) { 1949 NOT_LP64(assert(VM_Version::supports_sse(), "")); 1950 emit_byte(0xF3); 1951 int encode = prefix_and_encode(dst->encoding(), src->encoding()); 1952 emit_byte(0x0F); 1953 emit_byte(0x59); 1954 emit_byte(0xC0 | encode); 1955 } 1956 1957 void Assembler::negl(Register dst) { 1958 int encode = prefix_and_encode(dst->encoding()); 1959 emit_byte(0xF7); 1960 emit_byte(0xD8 | encode); 1961 } 1962 1963 void Assembler::nop(int i) { 1964 #ifdef ASSERT 1965 assert(i > 0, " "); 1966 // The fancy nops aren't currently recognized by debuggers making it a 1967 // pain to disassemble code while debugging. If asserts are on clearly 1968 // speed is not an issue so simply use the single byte traditional nop 1969 // to do alignment. 1970 1971 for (; i > 0 ; i--) emit_byte(0x90); 1972 return; 1973 1974 #endif // ASSERT 1975 1976 if (UseAddressNop && VM_Version::is_intel()) { 1977 // 1978 // Using multi-bytes nops "0x0F 0x1F [address]" for Intel 1979 // 1: 0x90 1980 // 2: 0x66 0x90 1981 // 3: 0x66 0x66 0x90 (don't use "0x0F 0x1F 0x00" - need patching safe padding) 1982 // 4: 0x0F 0x1F 0x40 0x00 1983 // 5: 0x0F 0x1F 0x44 0x00 0x00 1984 // 6: 0x66 0x0F 0x1F 0x44 0x00 0x00 1985 // 7: 0x0F 0x1F 0x80 0x00 0x00 0x00 0x00 1986 // 8: 0x0F 0x1F 0x84 0x00 0x00 0x00 0x00 0x00 1987 // 9: 0x66 0x0F 0x1F 0x84 0x00 0x00 0x00 0x00 0x00 1988 // 10: 0x66 0x66 0x0F 0x1F 0x84 0x00 0x00 0x00 0x00 0x00 1989 // 11: 0x66 0x66 0x66 0x0F 0x1F 0x84 0x00 0x00 0x00 0x00 0x00 1990 1991 // The rest coding is Intel specific - don't use consecutive address nops 1992 1993 // 12: 0x0F 0x1F 0x84 0x00 0x00 0x00 0x00 0x00 0x66 0x66 0x66 0x90 1994 // 13: 0x66 0x0F 0x1F 0x84 0x00 0x00 0x00 0x00 0x00 0x66 0x66 0x66 0x90 1995 // 14: 0x66 0x66 0x0F 0x1F 0x84 0x00 0x00 0x00 0x00 0x00 0x66 0x66 0x66 0x90 1996 // 15: 0x66 0x66 0x66 0x0F 0x1F 0x84 0x00 0x00 0x00 0x00 0x00 0x66 0x66 0x66 0x90 1997 1998 while(i >= 15) { 1999 // For Intel don't generate consecutive addess nops (mix with regular nops) 2000 i -= 15; 2001 emit_byte(0x66); // size prefix 2002 emit_byte(0x66); // size prefix 2003 emit_byte(0x66); // size prefix 2004 addr_nop_8(); 2005 emit_byte(0x66); // size prefix 2006 emit_byte(0x66); // size prefix 2007 emit_byte(0x66); // size prefix 2008 emit_byte(0x90); // nop 2009 } 2010 switch (i) { 2011 case 14: 2012 emit_byte(0x66); // size prefix 2013 case 13: 2014 emit_byte(0x66); // size prefix 2015 case 12: 2016 addr_nop_8(); 2017 emit_byte(0x66); // size prefix 2018 emit_byte(0x66); // size prefix 2019 emit_byte(0x66); // size prefix 2020 emit_byte(0x90); // nop 2021 break; 2022 case 11: 2023 emit_byte(0x66); // size prefix 2024 case 10: 2025 emit_byte(0x66); // size prefix 2026 case 9: 2027 emit_byte(0x66); // size prefix 2028 case 8: 2029 addr_nop_8(); 2030 break; 2031 case 7: 2032 addr_nop_7(); 2033 break; 2034 case 6: 2035 emit_byte(0x66); // size prefix 2036 case 5: 2037 addr_nop_5(); 2038 break; 2039 case 4: 2040 addr_nop_4(); 2041 break; 2042 case 3: 2043 // Don't use "0x0F 0x1F 0x00" - need patching safe padding 2044 emit_byte(0x66); // size prefix 2045 case 2: 2046 emit_byte(0x66); // size prefix 2047 case 1: 2048 emit_byte(0x90); // nop 2049 break; 2050 default: 2051 assert(i == 0, " "); 2052 } 2053 return; 2054 } 2055 if (UseAddressNop && VM_Version::is_amd()) { 2056 // 2057 // Using multi-bytes nops "0x0F 0x1F [address]" for AMD. 2058 // 1: 0x90 2059 // 2: 0x66 0x90 2060 // 3: 0x66 0x66 0x90 (don't use "0x0F 0x1F 0x00" - need patching safe padding) 2061 // 4: 0x0F 0x1F 0x40 0x00 2062 // 5: 0x0F 0x1F 0x44 0x00 0x00 2063 // 6: 0x66 0x0F 0x1F 0x44 0x00 0x00 2064 // 7: 0x0F 0x1F 0x80 0x00 0x00 0x00 0x00 2065 // 8: 0x0F 0x1F 0x84 0x00 0x00 0x00 0x00 0x00 2066 // 9: 0x66 0x0F 0x1F 0x84 0x00 0x00 0x00 0x00 0x00 2067 // 10: 0x66 0x66 0x0F 0x1F 0x84 0x00 0x00 0x00 0x00 0x00 2068 // 11: 0x66 0x66 0x66 0x0F 0x1F 0x84 0x00 0x00 0x00 0x00 0x00 2069 2070 // The rest coding is AMD specific - use consecutive address nops 2071 2072 // 12: 0x66 0x0F 0x1F 0x44 0x00 0x00 0x66 0x0F 0x1F 0x44 0x00 0x00 2073 // 13: 0x0F 0x1F 0x80 0x00 0x00 0x00 0x00 0x66 0x0F 0x1F 0x44 0x00 0x00 2074 // 14: 0x0F 0x1F 0x80 0x00 0x00 0x00 0x00 0x0F 0x1F 0x80 0x00 0x00 0x00 0x00 2075 // 15: 0x0F 0x1F 0x84 0x00 0x00 0x00 0x00 0x00 0x0F 0x1F 0x80 0x00 0x00 0x00 0x00 2076 // 16: 0x0F 0x1F 0x84 0x00 0x00 0x00 0x00 0x00 0x0F 0x1F 0x84 0x00 0x00 0x00 0x00 0x00 2077 // Size prefixes (0x66) are added for larger sizes 2078 2079 while(i >= 22) { 2080 i -= 11; 2081 emit_byte(0x66); // size prefix 2082 emit_byte(0x66); // size prefix 2083 emit_byte(0x66); // size prefix 2084 addr_nop_8(); 2085 } 2086 // Generate first nop for size between 21-12 2087 switch (i) { 2088 case 21: 2089 i -= 1; 2090 emit_byte(0x66); // size prefix 2091 case 20: 2092 case 19: 2093 i -= 1; 2094 emit_byte(0x66); // size prefix 2095 case 18: 2096 case 17: 2097 i -= 1; 2098 emit_byte(0x66); // size prefix 2099 case 16: 2100 case 15: 2101 i -= 8; 2102 addr_nop_8(); 2103 break; 2104 case 14: 2105 case 13: 2106 i -= 7; 2107 addr_nop_7(); 2108 break; 2109 case 12: 2110 i -= 6; 2111 emit_byte(0x66); // size prefix 2112 addr_nop_5(); 2113 break; 2114 default: 2115 assert(i < 12, " "); 2116 } 2117 2118 // Generate second nop for size between 11-1 2119 switch (i) { 2120 case 11: 2121 emit_byte(0x66); // size prefix 2122 case 10: 2123 emit_byte(0x66); // size prefix 2124 case 9: 2125 emit_byte(0x66); // size prefix 2126 case 8: 2127 addr_nop_8(); 2128 break; 2129 case 7: 2130 addr_nop_7(); 2131 break; 2132 case 6: 2133 emit_byte(0x66); // size prefix 2134 case 5: 2135 addr_nop_5(); 2136 break; 2137 case 4: 2138 addr_nop_4(); 2139 break; 2140 case 3: 2141 // Don't use "0x0F 0x1F 0x00" - need patching safe padding 2142 emit_byte(0x66); // size prefix 2143 case 2: 2144 emit_byte(0x66); // size prefix 2145 case 1: 2146 emit_byte(0x90); // nop 2147 break; 2148 default: 2149 assert(i == 0, " "); 2150 } 2151 return; 2152 } 2153 2154 // Using nops with size prefixes "0x66 0x90". 2155 // From AMD Optimization Guide: 2156 // 1: 0x90 2157 // 2: 0x66 0x90 2158 // 3: 0x66 0x66 0x90 2159 // 4: 0x66 0x66 0x66 0x90 2160 // 5: 0x66 0x66 0x90 0x66 0x90 2161 // 6: 0x66 0x66 0x90 0x66 0x66 0x90 2162 // 7: 0x66 0x66 0x66 0x90 0x66 0x66 0x90 2163 // 8: 0x66 0x66 0x66 0x90 0x66 0x66 0x66 0x90 2164 // 9: 0x66 0x66 0x90 0x66 0x66 0x90 0x66 0x66 0x90 2165 // 10: 0x66 0x66 0x66 0x90 0x66 0x66 0x90 0x66 0x66 0x90 2166 // 2167 while(i > 12) { 2168 i -= 4; 2169 emit_byte(0x66); // size prefix 2170 emit_byte(0x66); 2171 emit_byte(0x66); 2172 emit_byte(0x90); // nop 2173 } 2174 // 1 - 12 nops 2175 if(i > 8) { 2176 if(i > 9) { 2177 i -= 1; 2178 emit_byte(0x66); 2179 } 2180 i -= 3; 2181 emit_byte(0x66); 2182 emit_byte(0x66); 2183 emit_byte(0x90); 2184 } 2185 // 1 - 8 nops 2186 if(i > 4) { 2187 if(i > 6) { 2188 i -= 1; 2189 emit_byte(0x66); 2190 } 2191 i -= 3; 2192 emit_byte(0x66); 2193 emit_byte(0x66); 2194 emit_byte(0x90); 2195 } 2196 switch (i) { 2197 case 4: 2198 emit_byte(0x66); 2199 case 3: 2200 emit_byte(0x66); 2201 case 2: 2202 emit_byte(0x66); 2203 case 1: 2204 emit_byte(0x90); 2205 break; 2206 default: 2207 assert(i == 0, " "); 2208 } 2209 } 2210 2211 void Assembler::notl(Register dst) { 2212 int encode = prefix_and_encode(dst->encoding()); 2213 emit_byte(0xF7); 2214 emit_byte(0xD0 | encode ); 2215 } 2216 2217 void Assembler::orl(Address dst, int32_t imm32) { 2218 InstructionMark im(this); 2219 prefix(dst); 2220 emit_arith_operand(0x81, rcx, dst, imm32); 2221 } 2222 2223 void Assembler::orl(Register dst, int32_t imm32) { 2224 prefix(dst); 2225 emit_arith(0x81, 0xC8, dst, imm32); 2226 } 2227 2228 void Assembler::orl(Register dst, Address src) { 2229 InstructionMark im(this); 2230 prefix(src, dst); 2231 emit_byte(0x0B); 2232 emit_operand(dst, src); 2233 } 2234 2235 void Assembler::orl(Register dst, Register src) { 2236 (void) prefix_and_encode(dst->encoding(), src->encoding()); 2237 emit_arith(0x0B, 0xC0, dst, src); 2238 } 2239 2240 void Assembler::pcmpestri(XMMRegister dst, Address src, int imm8) { 2241 assert(VM_Version::supports_sse4_2(), ""); 2242 2243 InstructionMark im(this); 2244 emit_byte(0x66); 2245 prefix(src, dst); 2246 emit_byte(0x0F); 2247 emit_byte(0x3A); 2248 emit_byte(0x61); 2249 emit_operand(dst, src); 2250 emit_byte(imm8); 2251 } 2252 2253 void Assembler::pcmpestri(XMMRegister dst, XMMRegister src, int imm8) { 2254 assert(VM_Version::supports_sse4_2(), ""); 2255 2256 emit_byte(0x66); 2257 int encode = prefixq_and_encode(dst->encoding(), src->encoding()); 2258 emit_byte(0x0F); 2259 emit_byte(0x3A); 2260 emit_byte(0x61); 2261 emit_byte(0xC0 | encode); 2262 emit_byte(imm8); 2263 } 2264 2265 // generic 2266 void Assembler::pop(Register dst) { 2267 int encode = prefix_and_encode(dst->encoding()); 2268 emit_byte(0x58 | encode); 2269 } 2270 2271 void Assembler::popcntl(Register dst, Address src) { 2272 assert(VM_Version::supports_popcnt(), "must support"); 2273 InstructionMark im(this); 2274 emit_byte(0xF3); 2275 prefix(src, dst); 2276 emit_byte(0x0F); 2277 emit_byte(0xB8); 2278 emit_operand(dst, src); 2279 } 2280 2281 void Assembler::popcntl(Register dst, Register src) { 2282 assert(VM_Version::supports_popcnt(), "must support"); 2283 emit_byte(0xF3); 2284 int encode = prefix_and_encode(dst->encoding(), src->encoding()); 2285 emit_byte(0x0F); 2286 emit_byte(0xB8); 2287 emit_byte(0xC0 | encode); 2288 } 2289 2290 void Assembler::popf() { 2291 emit_byte(0x9D); 2292 } 2293 2294 #ifndef _LP64 // no 32bit push/pop on amd64 2295 void Assembler::popl(Address dst) { 2296 // NOTE: this will adjust stack by 8byte on 64bits 2297 InstructionMark im(this); 2298 prefix(dst); 2299 emit_byte(0x8F); 2300 emit_operand(rax, dst); 2301 } 2302 #endif 2303 2304 void Assembler::prefetch_prefix(Address src) { 2305 prefix(src); 2306 emit_byte(0x0F); 2307 } 2308 2309 void Assembler::prefetchnta(Address src) { 2310 NOT_LP64(assert(VM_Version::supports_sse2(), "must support")); 2311 InstructionMark im(this); 2312 prefetch_prefix(src); 2313 emit_byte(0x18); 2314 emit_operand(rax, src); // 0, src 2315 } 2316 2317 void Assembler::prefetchr(Address src) { 2318 NOT_LP64(assert(VM_Version::supports_3dnow_prefetch(), "must support")); 2319 InstructionMark im(this); 2320 prefetch_prefix(src); 2321 emit_byte(0x0D); 2322 emit_operand(rax, src); // 0, src 2323 } 2324 2325 void Assembler::prefetcht0(Address src) { 2326 NOT_LP64(assert(VM_Version::supports_sse(), "must support")); 2327 InstructionMark im(this); 2328 prefetch_prefix(src); 2329 emit_byte(0x18); 2330 emit_operand(rcx, src); // 1, src 2331 } 2332 2333 void Assembler::prefetcht1(Address src) { 2334 NOT_LP64(assert(VM_Version::supports_sse(), "must support")); 2335 InstructionMark im(this); 2336 prefetch_prefix(src); 2337 emit_byte(0x18); 2338 emit_operand(rdx, src); // 2, src 2339 } 2340 2341 void Assembler::prefetcht2(Address src) { 2342 NOT_LP64(assert(VM_Version::supports_sse(), "must support")); 2343 InstructionMark im(this); 2344 prefetch_prefix(src); 2345 emit_byte(0x18); 2346 emit_operand(rbx, src); // 3, src 2347 } 2348 2349 void Assembler::prefetchw(Address src) { 2350 NOT_LP64(assert(VM_Version::supports_3dnow_prefetch(), "must support")); 2351 InstructionMark im(this); 2352 prefetch_prefix(src); 2353 emit_byte(0x0D); 2354 emit_operand(rcx, src); // 1, src 2355 } 2356 2357 void Assembler::prefix(Prefix p) { 2358 a_byte(p); 2359 } 2360 2361 void Assembler::por(XMMRegister dst, XMMRegister src) { 2362 NOT_LP64(assert(VM_Version::supports_sse2(), "")); 2363 2364 emit_byte(0x66); 2365 int encode = prefix_and_encode(dst->encoding(), src->encoding()); 2366 emit_byte(0x0F); 2367 2368 emit_byte(0xEB); 2369 emit_byte(0xC0 | encode); 2370 } 2371 2372 void Assembler::pshufd(XMMRegister dst, XMMRegister src, int mode) { 2373 assert(isByte(mode), "invalid value"); 2374 NOT_LP64(assert(VM_Version::supports_sse2(), "")); 2375 2376 emit_byte(0x66); 2377 int encode = prefix_and_encode(dst->encoding(), src->encoding()); 2378 emit_byte(0x0F); 2379 emit_byte(0x70); 2380 emit_byte(0xC0 | encode); 2381 emit_byte(mode & 0xFF); 2382 2383 } 2384 2385 void Assembler::pshufd(XMMRegister dst, Address src, int mode) { 2386 assert(isByte(mode), "invalid value"); 2387 NOT_LP64(assert(VM_Version::supports_sse2(), "")); 2388 2389 InstructionMark im(this); 2390 emit_byte(0x66); 2391 prefix(src, dst); 2392 emit_byte(0x0F); 2393 emit_byte(0x70); 2394 emit_operand(dst, src); 2395 emit_byte(mode & 0xFF); 2396 } 2397 2398 void Assembler::pshuflw(XMMRegister dst, XMMRegister src, int mode) { 2399 assert(isByte(mode), "invalid value"); 2400 NOT_LP64(assert(VM_Version::supports_sse2(), "")); 2401 2402 emit_byte(0xF2); 2403 int encode = prefix_and_encode(dst->encoding(), src->encoding()); 2404 emit_byte(0x0F); 2405 emit_byte(0x70); 2406 emit_byte(0xC0 | encode); 2407 emit_byte(mode & 0xFF); 2408 } 2409 2410 void Assembler::pshuflw(XMMRegister dst, Address src, int mode) { 2411 assert(isByte(mode), "invalid value"); 2412 NOT_LP64(assert(VM_Version::supports_sse2(), "")); 2413 2414 InstructionMark im(this); 2415 emit_byte(0xF2); 2416 prefix(src, dst); // QQ new 2417 emit_byte(0x0F); 2418 emit_byte(0x70); 2419 emit_operand(dst, src); 2420 emit_byte(mode & 0xFF); 2421 } 2422 2423 void Assembler::psrlq(XMMRegister dst, int shift) { 2424 // Shift 64 bit value logically right by specified number of bits. 2425 // HMM Table D-1 says sse2 or mmx. 2426 // Do not confuse it with psrldq SSE2 instruction which 2427 // shifts 128 bit value in xmm register by number of bytes. 2428 NOT_LP64(assert(VM_Version::supports_sse(), "")); 2429 2430 int encode = prefixq_and_encode(xmm2->encoding(), dst->encoding()); 2431 emit_byte(0x66); 2432 emit_byte(0x0F); 2433 emit_byte(0x73); 2434 emit_byte(0xC0 | encode); 2435 emit_byte(shift); 2436 } 2437 2438 void Assembler::psrldq(XMMRegister dst, int shift) { 2439 // Shift 128 bit value in xmm register by number of bytes. 2440 NOT_LP64(assert(VM_Version::supports_sse2(), "")); 2441 2442 int encode = prefixq_and_encode(xmm3->encoding(), dst->encoding()); 2443 emit_byte(0x66); 2444 emit_byte(0x0F); 2445 emit_byte(0x73); 2446 emit_byte(0xC0 | encode); 2447 emit_byte(shift); 2448 } 2449 2450 void Assembler::ptest(XMMRegister dst, Address src) { 2451 assert(VM_Version::supports_sse4_1(), ""); 2452 2453 InstructionMark im(this); 2454 emit_byte(0x66); 2455 prefix(src, dst); 2456 emit_byte(0x0F); 2457 emit_byte(0x38); 2458 emit_byte(0x17); 2459 emit_operand(dst, src); 2460 } 2461 2462 void Assembler::ptest(XMMRegister dst, XMMRegister src) { 2463 assert(VM_Version::supports_sse4_1(), ""); 2464 2465 emit_byte(0x66); 2466 int encode = prefixq_and_encode(dst->encoding(), src->encoding()); 2467 emit_byte(0x0F); 2468 emit_byte(0x38); 2469 emit_byte(0x17); 2470 emit_byte(0xC0 | encode); 2471 } 2472 2473 void Assembler::punpcklbw(XMMRegister dst, XMMRegister src) { 2474 NOT_LP64(assert(VM_Version::supports_sse2(), "")); 2475 emit_byte(0x66); 2476 int encode = prefix_and_encode(dst->encoding(), src->encoding()); 2477 emit_byte(0x0F); 2478 emit_byte(0x60); 2479 emit_byte(0xC0 | encode); 2480 } 2481 2482 void Assembler::push(int32_t imm32) { 2483 // in 64bits we push 64bits onto the stack but only 2484 // take a 32bit immediate 2485 emit_byte(0x68); 2486 emit_long(imm32); 2487 } 2488 2489 void Assembler::push(Register src) { 2490 int encode = prefix_and_encode(src->encoding()); 2491 2492 emit_byte(0x50 | encode); 2493 } 2494 2495 void Assembler::pushf() { 2496 emit_byte(0x9C); 2497 } 2498 2499 #ifndef _LP64 // no 32bit push/pop on amd64 2500 void Assembler::pushl(Address src) { 2501 // Note this will push 64bit on 64bit 2502 InstructionMark im(this); 2503 prefix(src); 2504 emit_byte(0xFF); 2505 emit_operand(rsi, src); 2506 } 2507 #endif 2508 2509 void Assembler::pxor(XMMRegister dst, Address src) { 2510 NOT_LP64(assert(VM_Version::supports_sse2(), "")); 2511 InstructionMark im(this); 2512 emit_byte(0x66); 2513 prefix(src, dst); 2514 emit_byte(0x0F); 2515 emit_byte(0xEF); 2516 emit_operand(dst, src); 2517 } 2518 2519 void Assembler::pxor(XMMRegister dst, XMMRegister src) { 2520 NOT_LP64(assert(VM_Version::supports_sse2(), "")); 2521 InstructionMark im(this); 2522 emit_byte(0x66); 2523 int encode = prefix_and_encode(dst->encoding(), src->encoding()); 2524 emit_byte(0x0F); 2525 emit_byte(0xEF); 2526 emit_byte(0xC0 | encode); 2527 } 2528 2529 void Assembler::rcll(Register dst, int imm8) { 2530 assert(isShiftCount(imm8), "illegal shift count"); 2531 int encode = prefix_and_encode(dst->encoding()); 2532 if (imm8 == 1) { 2533 emit_byte(0xD1); 2534 emit_byte(0xD0 | encode); 2535 } else { 2536 emit_byte(0xC1); 2537 emit_byte(0xD0 | encode); 2538 emit_byte(imm8); 2539 } 2540 } 2541 2542 // copies data from [esi] to [edi] using rcx pointer sized words 2543 // generic 2544 void Assembler::rep_mov() { 2545 emit_byte(0xF3); 2546 // MOVSQ 2547 LP64_ONLY(prefix(REX_W)); 2548 emit_byte(0xA5); 2549 } 2550 2551 // sets rcx pointer sized words with rax, value at [edi] 2552 // generic 2553 void Assembler::rep_set() { // rep_set 2554 emit_byte(0xF3); 2555 // STOSQ 2556 LP64_ONLY(prefix(REX_W)); 2557 emit_byte(0xAB); 2558 } 2559 2560 // scans rcx pointer sized words at [edi] for occurance of rax, 2561 // generic 2562 void Assembler::repne_scan() { // repne_scan 2563 emit_byte(0xF2); 2564 // SCASQ 2565 LP64_ONLY(prefix(REX_W)); 2566 emit_byte(0xAF); 2567 } 2568 2569 #ifdef _LP64 2570 // scans rcx 4 byte words at [edi] for occurance of rax, 2571 // generic 2572 void Assembler::repne_scanl() { // repne_scan 2573 emit_byte(0xF2); 2574 // SCASL 2575 emit_byte(0xAF); 2576 } 2577 #endif 2578 2579 void Assembler::ret(int imm16) { 2580 if (imm16 == 0) { 2581 emit_byte(0xC3); 2582 } else { 2583 emit_byte(0xC2); 2584 emit_word(imm16); 2585 } 2586 } 2587 2588 void Assembler::sahf() { 2589 #ifdef _LP64 2590 // Not supported in 64bit mode 2591 ShouldNotReachHere(); 2592 #endif 2593 emit_byte(0x9E); 2594 } 2595 2596 void Assembler::sarl(Register dst, int imm8) { 2597 int encode = prefix_and_encode(dst->encoding()); 2598 assert(isShiftCount(imm8), "illegal shift count"); 2599 if (imm8 == 1) { 2600 emit_byte(0xD1); 2601 emit_byte(0xF8 | encode); 2602 } else { 2603 emit_byte(0xC1); 2604 emit_byte(0xF8 | encode); 2605 emit_byte(imm8); 2606 } 2607 } 2608 2609 void Assembler::sarl(Register dst) { 2610 int encode = prefix_and_encode(dst->encoding()); 2611 emit_byte(0xD3); 2612 emit_byte(0xF8 | encode); 2613 } 2614 2615 void Assembler::sbbl(Address dst, int32_t imm32) { 2616 InstructionMark im(this); 2617 prefix(dst); 2618 emit_arith_operand(0x81, rbx, dst, imm32); 2619 } 2620 2621 void Assembler::sbbl(Register dst, int32_t imm32) { 2622 prefix(dst); 2623 emit_arith(0x81, 0xD8, dst, imm32); 2624 } 2625 2626 2627 void Assembler::sbbl(Register dst, Address src) { 2628 InstructionMark im(this); 2629 prefix(src, dst); 2630 emit_byte(0x1B); 2631 emit_operand(dst, src); 2632 } 2633 2634 void Assembler::sbbl(Register dst, Register src) { 2635 (void) prefix_and_encode(dst->encoding(), src->encoding()); 2636 emit_arith(0x1B, 0xC0, dst, src); 2637 } 2638 2639 void Assembler::setb(Condition cc, Register dst) { 2640 assert(0 <= cc && cc < 16, "illegal cc"); 2641 int encode = prefix_and_encode(dst->encoding(), true); 2642 emit_byte(0x0F); 2643 emit_byte(0x90 | cc); 2644 emit_byte(0xC0 | encode); 2645 } 2646 2647 void Assembler::shll(Register dst, int imm8) { 2648 assert(isShiftCount(imm8), "illegal shift count"); 2649 int encode = prefix_and_encode(dst->encoding()); 2650 if (imm8 == 1 ) { 2651 emit_byte(0xD1); 2652 emit_byte(0xE0 | encode); 2653 } else { 2654 emit_byte(0xC1); 2655 emit_byte(0xE0 | encode); 2656 emit_byte(imm8); 2657 } 2658 } 2659 2660 void Assembler::shll(Register dst) { 2661 int encode = prefix_and_encode(dst->encoding()); 2662 emit_byte(0xD3); 2663 emit_byte(0xE0 | encode); 2664 } 2665 2666 void Assembler::shrl(Register dst, int imm8) { 2667 assert(isShiftCount(imm8), "illegal shift count"); 2668 int encode = prefix_and_encode(dst->encoding()); 2669 emit_byte(0xC1); 2670 emit_byte(0xE8 | encode); 2671 emit_byte(imm8); 2672 } 2673 2674 void Assembler::shrl(Register dst) { 2675 int encode = prefix_and_encode(dst->encoding()); 2676 emit_byte(0xD3); 2677 emit_byte(0xE8 | encode); 2678 } 2679 2680 // copies a single word from [esi] to [edi] 2681 void Assembler::smovl() { 2682 emit_byte(0xA5); 2683 } 2684 2685 void Assembler::sqrtsd(XMMRegister dst, XMMRegister src) { 2686 // HMM Table D-1 says sse2 2687 // NOT_LP64(assert(VM_Version::supports_sse(), "")); 2688 NOT_LP64(assert(VM_Version::supports_sse2(), "")); 2689 emit_byte(0xF2); 2690 int encode = prefix_and_encode(dst->encoding(), src->encoding()); 2691 emit_byte(0x0F); 2692 emit_byte(0x51); 2693 emit_byte(0xC0 | encode); 2694 } 2695 2696 void Assembler::sqrtsd(XMMRegister dst, Address src) { 2697 NOT_LP64(assert(VM_Version::supports_sse2(), "")); 2698 InstructionMark im(this); 2699 emit_byte(0xF2); 2700 prefix(src, dst); 2701 emit_byte(0x0F); 2702 emit_byte(0x51); 2703 emit_operand(dst, src); 2704 } 2705 2706 void Assembler::sqrtss(XMMRegister dst, XMMRegister src) { 2707 // HMM Table D-1 says sse2 2708 // NOT_LP64(assert(VM_Version::supports_sse(), "")); 2709 NOT_LP64(assert(VM_Version::supports_sse2(), "")); 2710 emit_byte(0xF3); 2711 int encode = prefix_and_encode(dst->encoding(), src->encoding()); 2712 emit_byte(0x0F); 2713 emit_byte(0x51); 2714 emit_byte(0xC0 | encode); 2715 } 2716 2717 void Assembler::sqrtss(XMMRegister dst, Address src) { 2718 NOT_LP64(assert(VM_Version::supports_sse2(), "")); 2719 InstructionMark im(this); 2720 emit_byte(0xF3); 2721 prefix(src, dst); 2722 emit_byte(0x0F); 2723 emit_byte(0x51); 2724 emit_operand(dst, src); 2725 } 2726 2727 void Assembler::stmxcsr( Address dst) { 2728 NOT_LP64(assert(VM_Version::supports_sse(), "")); 2729 InstructionMark im(this); 2730 prefix(dst); 2731 emit_byte(0x0F); 2732 emit_byte(0xAE); 2733 emit_operand(as_Register(3), dst); 2734 } 2735 2736 void Assembler::subl(Address dst, int32_t imm32) { 2737 InstructionMark im(this); 2738 prefix(dst); 2739 emit_arith_operand(0x81, rbp, dst, imm32); 2740 } 2741 2742 void Assembler::subl(Address dst, Register src) { 2743 InstructionMark im(this); 2744 prefix(dst, src); 2745 emit_byte(0x29); 2746 emit_operand(src, dst); 2747 } 2748 2749 void Assembler::subl(Register dst, int32_t imm32) { 2750 prefix(dst); 2751 emit_arith(0x81, 0xE8, dst, imm32); 2752 } 2753 2754 void Assembler::subl(Register dst, Address src) { 2755 InstructionMark im(this); 2756 prefix(src, dst); 2757 emit_byte(0x2B); 2758 emit_operand(dst, src); 2759 } 2760 2761 void Assembler::subl(Register dst, Register src) { 2762 (void) prefix_and_encode(dst->encoding(), src->encoding()); 2763 emit_arith(0x2B, 0xC0, dst, src); 2764 } 2765 2766 void Assembler::subsd(XMMRegister dst, XMMRegister src) { 2767 NOT_LP64(assert(VM_Version::supports_sse2(), "")); 2768 emit_byte(0xF2); 2769 int encode = prefix_and_encode(dst->encoding(), src->encoding()); 2770 emit_byte(0x0F); 2771 emit_byte(0x5C); 2772 emit_byte(0xC0 | encode); 2773 } 2774 2775 void Assembler::subsd(XMMRegister dst, Address src) { 2776 NOT_LP64(assert(VM_Version::supports_sse2(), "")); 2777 InstructionMark im(this); 2778 emit_byte(0xF2); 2779 prefix(src, dst); 2780 emit_byte(0x0F); 2781 emit_byte(0x5C); 2782 emit_operand(dst, src); 2783 } 2784 2785 void Assembler::subss(XMMRegister dst, XMMRegister src) { 2786 NOT_LP64(assert(VM_Version::supports_sse(), "")); 2787 emit_byte(0xF3); 2788 int encode = prefix_and_encode(dst->encoding(), src->encoding()); 2789 emit_byte(0x0F); 2790 emit_byte(0x5C); 2791 emit_byte(0xC0 | encode); 2792 } 2793 2794 void Assembler::subss(XMMRegister dst, Address src) { 2795 NOT_LP64(assert(VM_Version::supports_sse(), "")); 2796 InstructionMark im(this); 2797 emit_byte(0xF3); 2798 prefix(src, dst); 2799 emit_byte(0x0F); 2800 emit_byte(0x5C); 2801 emit_operand(dst, src); 2802 } 2803 2804 void Assembler::testb(Register dst, int imm8) { 2805 NOT_LP64(assert(dst->has_byte_register(), "must have byte register")); 2806 (void) prefix_and_encode(dst->encoding(), true); 2807 emit_arith_b(0xF6, 0xC0, dst, imm8); 2808 } 2809 2810 void Assembler::testl(Register dst, int32_t imm32) { 2811 // not using emit_arith because test 2812 // doesn't support sign-extension of 2813 // 8bit operands 2814 int encode = dst->encoding(); 2815 if (encode == 0) { 2816 emit_byte(0xA9); 2817 } else { 2818 encode = prefix_and_encode(encode); 2819 emit_byte(0xF7); 2820 emit_byte(0xC0 | encode); 2821 } 2822 emit_long(imm32); 2823 } 2824 2825 void Assembler::testl(Register dst, Register src) { 2826 (void) prefix_and_encode(dst->encoding(), src->encoding()); 2827 emit_arith(0x85, 0xC0, dst, src); 2828 } 2829 2830 void Assembler::testl(Register dst, Address src) { 2831 InstructionMark im(this); 2832 prefix(src, dst); 2833 emit_byte(0x85); 2834 emit_operand(dst, src); 2835 } 2836 2837 void Assembler::ucomisd(XMMRegister dst, Address src) { 2838 NOT_LP64(assert(VM_Version::supports_sse2(), "")); 2839 emit_byte(0x66); 2840 ucomiss(dst, src); 2841 } 2842 2843 void Assembler::ucomisd(XMMRegister dst, XMMRegister src) { 2844 NOT_LP64(assert(VM_Version::supports_sse2(), "")); 2845 emit_byte(0x66); 2846 ucomiss(dst, src); 2847 } 2848 2849 void Assembler::ucomiss(XMMRegister dst, Address src) { 2850 NOT_LP64(assert(VM_Version::supports_sse(), "")); 2851 2852 InstructionMark im(this); 2853 prefix(src, dst); 2854 emit_byte(0x0F); 2855 emit_byte(0x2E); 2856 emit_operand(dst, src); 2857 } 2858 2859 void Assembler::ucomiss(XMMRegister dst, XMMRegister src) { 2860 NOT_LP64(assert(VM_Version::supports_sse(), "")); 2861 int encode = prefix_and_encode(dst->encoding(), src->encoding()); 2862 emit_byte(0x0F); 2863 emit_byte(0x2E); 2864 emit_byte(0xC0 | encode); 2865 } 2866 2867 2868 void Assembler::xaddl(Address dst, Register src) { 2869 InstructionMark im(this); 2870 prefix(dst, src); 2871 emit_byte(0x0F); 2872 emit_byte(0xC1); 2873 emit_operand(src, dst); 2874 } 2875 2876 void Assembler::xchgl(Register dst, Address src) { // xchg 2877 InstructionMark im(this); 2878 prefix(src, dst); 2879 emit_byte(0x87); 2880 emit_operand(dst, src); 2881 } 2882 2883 void Assembler::xchgl(Register dst, Register src) { 2884 int encode = prefix_and_encode(dst->encoding(), src->encoding()); 2885 emit_byte(0x87); 2886 emit_byte(0xc0 | encode); 2887 } 2888 2889 void Assembler::xorl(Register dst, int32_t imm32) { 2890 prefix(dst); 2891 emit_arith(0x81, 0xF0, dst, imm32); 2892 } 2893 2894 void Assembler::xorl(Register dst, Address src) { 2895 InstructionMark im(this); 2896 prefix(src, dst); 2897 emit_byte(0x33); 2898 emit_operand(dst, src); 2899 } 2900 2901 void Assembler::xorl(Register dst, Register src) { 2902 (void) prefix_and_encode(dst->encoding(), src->encoding()); 2903 emit_arith(0x33, 0xC0, dst, src); 2904 } 2905 2906 void Assembler::xorpd(XMMRegister dst, XMMRegister src) { 2907 NOT_LP64(assert(VM_Version::supports_sse2(), "")); 2908 emit_byte(0x66); 2909 xorps(dst, src); 2910 } 2911 2912 void Assembler::xorpd(XMMRegister dst, Address src) { 2913 NOT_LP64(assert(VM_Version::supports_sse2(), "")); 2914 InstructionMark im(this); 2915 emit_byte(0x66); 2916 prefix(src, dst); 2917 emit_byte(0x0F); 2918 emit_byte(0x57); 2919 emit_operand(dst, src); 2920 } 2921 2922 2923 void Assembler::xorps(XMMRegister dst, XMMRegister src) { 2924 NOT_LP64(assert(VM_Version::supports_sse(), "")); 2925 int encode = prefix_and_encode(dst->encoding(), src->encoding()); 2926 emit_byte(0x0F); 2927 emit_byte(0x57); 2928 emit_byte(0xC0 | encode); 2929 } 2930 2931 void Assembler::xorps(XMMRegister dst, Address src) { 2932 NOT_LP64(assert(VM_Version::supports_sse(), "")); 2933 InstructionMark im(this); 2934 prefix(src, dst); 2935 emit_byte(0x0F); 2936 emit_byte(0x57); 2937 emit_operand(dst, src); 2938 } 2939 2940 #ifndef _LP64 2941 // 32bit only pieces of the assembler 2942 2943 void Assembler::cmp_literal32(Register src1, int32_t imm32, RelocationHolder const& rspec) { 2944 // NO PREFIX AS NEVER 64BIT 2945 InstructionMark im(this); 2946 emit_byte(0x81); 2947 emit_byte(0xF8 | src1->encoding()); 2948 emit_data(imm32, rspec, 0); 2949 } 2950 2951 void Assembler::cmp_literal32(Address src1, int32_t imm32, RelocationHolder const& rspec) { 2952 // NO PREFIX AS NEVER 64BIT (not even 32bit versions of 64bit regs 2953 InstructionMark im(this); 2954 emit_byte(0x81); 2955 emit_operand(rdi, src1); 2956 emit_data(imm32, rspec, 0); 2957 } 2958 2959 // The 64-bit (32bit platform) cmpxchg compares the value at adr with the contents of rdx:rax, 2960 // and stores rcx:rbx into adr if so; otherwise, the value at adr is loaded 2961 // into rdx:rax. The ZF is set if the compared values were equal, and cleared otherwise. 2962 void Assembler::cmpxchg8(Address adr) { 2963 InstructionMark im(this); 2964 emit_byte(0x0F); 2965 emit_byte(0xc7); 2966 emit_operand(rcx, adr); 2967 } 2968 2969 void Assembler::decl(Register dst) { 2970 // Don't use it directly. Use MacroAssembler::decrementl() instead. 2971 emit_byte(0x48 | dst->encoding()); 2972 } 2973 2974 #endif // _LP64 2975 2976 // 64bit typically doesn't use the x87 but needs to for the trig funcs 2977 2978 void Assembler::fabs() { 2979 emit_byte(0xD9); 2980 emit_byte(0xE1); 2981 } 2982 2983 void Assembler::fadd(int i) { 2984 emit_farith(0xD8, 0xC0, i); 2985 } 2986 2987 void Assembler::fadd_d(Address src) { 2988 InstructionMark im(this); 2989 emit_byte(0xDC); 2990 emit_operand32(rax, src); 2991 } 2992 2993 void Assembler::fadd_s(Address src) { 2994 InstructionMark im(this); 2995 emit_byte(0xD8); 2996 emit_operand32(rax, src); 2997 } 2998 2999 void Assembler::fadda(int i) { 3000 emit_farith(0xDC, 0xC0, i); 3001 } 3002 3003 void Assembler::faddp(int i) { 3004 emit_farith(0xDE, 0xC0, i); 3005 } 3006 3007 void Assembler::fchs() { 3008 emit_byte(0xD9); 3009 emit_byte(0xE0); 3010 } 3011 3012 void Assembler::fcom(int i) { 3013 emit_farith(0xD8, 0xD0, i); 3014 } 3015 3016 void Assembler::fcomp(int i) { 3017 emit_farith(0xD8, 0xD8, i); 3018 } 3019 3020 void Assembler::fcomp_d(Address src) { 3021 InstructionMark im(this); 3022 emit_byte(0xDC); 3023 emit_operand32(rbx, src); 3024 } 3025 3026 void Assembler::fcomp_s(Address src) { 3027 InstructionMark im(this); 3028 emit_byte(0xD8); 3029 emit_operand32(rbx, src); 3030 } 3031 3032 void Assembler::fcompp() { 3033 emit_byte(0xDE); 3034 emit_byte(0xD9); 3035 } 3036 3037 void Assembler::fcos() { 3038 emit_byte(0xD9); 3039 emit_byte(0xFF); 3040 } 3041 3042 void Assembler::fdecstp() { 3043 emit_byte(0xD9); 3044 emit_byte(0xF6); 3045 } 3046 3047 void Assembler::fdiv(int i) { 3048 emit_farith(0xD8, 0xF0, i); 3049 } 3050 3051 void Assembler::fdiv_d(Address src) { 3052 InstructionMark im(this); 3053 emit_byte(0xDC); 3054 emit_operand32(rsi, src); 3055 } 3056 3057 void Assembler::fdiv_s(Address src) { 3058 InstructionMark im(this); 3059 emit_byte(0xD8); 3060 emit_operand32(rsi, src); 3061 } 3062 3063 void Assembler::fdiva(int i) { 3064 emit_farith(0xDC, 0xF8, i); 3065 } 3066 3067 // Note: The Intel manual (Pentium Processor User's Manual, Vol.3, 1994) 3068 // is erroneous for some of the floating-point instructions below. 3069 3070 void Assembler::fdivp(int i) { 3071 emit_farith(0xDE, 0xF8, i); // ST(0) <- ST(0) / ST(1) and pop (Intel manual wrong) 3072 } 3073 3074 void Assembler::fdivr(int i) { 3075 emit_farith(0xD8, 0xF8, i); 3076 } 3077 3078 void Assembler::fdivr_d(Address src) { 3079 InstructionMark im(this); 3080 emit_byte(0xDC); 3081 emit_operand32(rdi, src); 3082 } 3083 3084 void Assembler::fdivr_s(Address src) { 3085 InstructionMark im(this); 3086 emit_byte(0xD8); 3087 emit_operand32(rdi, src); 3088 } 3089 3090 void Assembler::fdivra(int i) { 3091 emit_farith(0xDC, 0xF0, i); 3092 } 3093 3094 void Assembler::fdivrp(int i) { 3095 emit_farith(0xDE, 0xF0, i); // ST(0) <- ST(1) / ST(0) and pop (Intel manual wrong) 3096 } 3097 3098 void Assembler::ffree(int i) { 3099 emit_farith(0xDD, 0xC0, i); 3100 } 3101 3102 void Assembler::fild_d(Address adr) { 3103 InstructionMark im(this); 3104 emit_byte(0xDF); 3105 emit_operand32(rbp, adr); 3106 } 3107 3108 void Assembler::fild_s(Address adr) { 3109 InstructionMark im(this); 3110 emit_byte(0xDB); 3111 emit_operand32(rax, adr); 3112 } 3113 3114 void Assembler::fincstp() { 3115 emit_byte(0xD9); 3116 emit_byte(0xF7); 3117 } 3118 3119 void Assembler::finit() { 3120 emit_byte(0x9B); 3121 emit_byte(0xDB); 3122 emit_byte(0xE3); 3123 } 3124 3125 void Assembler::fist_s(Address adr) { 3126 InstructionMark im(this); 3127 emit_byte(0xDB); 3128 emit_operand32(rdx, adr); 3129 } 3130 3131 void Assembler::fistp_d(Address adr) { 3132 InstructionMark im(this); 3133 emit_byte(0xDF); 3134 emit_operand32(rdi, adr); 3135 } 3136 3137 void Assembler::fistp_s(Address adr) { 3138 InstructionMark im(this); 3139 emit_byte(0xDB); 3140 emit_operand32(rbx, adr); 3141 } 3142 3143 void Assembler::fld1() { 3144 emit_byte(0xD9); 3145 emit_byte(0xE8); 3146 } 3147 3148 void Assembler::fld_d(Address adr) { 3149 InstructionMark im(this); 3150 emit_byte(0xDD); 3151 emit_operand32(rax, adr); 3152 } 3153 3154 void Assembler::fld_s(Address adr) { 3155 InstructionMark im(this); 3156 emit_byte(0xD9); 3157 emit_operand32(rax, adr); 3158 } 3159 3160 3161 void Assembler::fld_s(int index) { 3162 emit_farith(0xD9, 0xC0, index); 3163 } 3164 3165 void Assembler::fld_x(Address adr) { 3166 InstructionMark im(this); 3167 emit_byte(0xDB); 3168 emit_operand32(rbp, adr); 3169 } 3170 3171 void Assembler::fldcw(Address src) { 3172 InstructionMark im(this); 3173 emit_byte(0xd9); 3174 emit_operand32(rbp, src); 3175 } 3176 3177 void Assembler::fldenv(Address src) { 3178 InstructionMark im(this); 3179 emit_byte(0xD9); 3180 emit_operand32(rsp, src); 3181 } 3182 3183 void Assembler::fldlg2() { 3184 emit_byte(0xD9); 3185 emit_byte(0xEC); 3186 } 3187 3188 void Assembler::fldln2() { 3189 emit_byte(0xD9); 3190 emit_byte(0xED); 3191 } 3192 3193 void Assembler::fldz() { 3194 emit_byte(0xD9); 3195 emit_byte(0xEE); 3196 } 3197 3198 void Assembler::flog() { 3199 fldln2(); 3200 fxch(); 3201 fyl2x(); 3202 } 3203 3204 void Assembler::flog10() { 3205 fldlg2(); 3206 fxch(); 3207 fyl2x(); 3208 } 3209 3210 void Assembler::fmul(int i) { 3211 emit_farith(0xD8, 0xC8, i); 3212 } 3213 3214 void Assembler::fmul_d(Address src) { 3215 InstructionMark im(this); 3216 emit_byte(0xDC); 3217 emit_operand32(rcx, src); 3218 } 3219 3220 void Assembler::fmul_s(Address src) { 3221 InstructionMark im(this); 3222 emit_byte(0xD8); 3223 emit_operand32(rcx, src); 3224 } 3225 3226 void Assembler::fmula(int i) { 3227 emit_farith(0xDC, 0xC8, i); 3228 } 3229 3230 void Assembler::fmulp(int i) { 3231 emit_farith(0xDE, 0xC8, i); 3232 } 3233 3234 void Assembler::fnsave(Address dst) { 3235 InstructionMark im(this); 3236 emit_byte(0xDD); 3237 emit_operand32(rsi, dst); 3238 } 3239 3240 void Assembler::fnstcw(Address src) { 3241 InstructionMark im(this); 3242 emit_byte(0x9B); 3243 emit_byte(0xD9); 3244 emit_operand32(rdi, src); 3245 } 3246 3247 void Assembler::fnstsw_ax() { 3248 emit_byte(0xdF); 3249 emit_byte(0xE0); 3250 } 3251 3252 void Assembler::fprem() { 3253 emit_byte(0xD9); 3254 emit_byte(0xF8); 3255 } 3256 3257 void Assembler::fprem1() { 3258 emit_byte(0xD9); 3259 emit_byte(0xF5); 3260 } 3261 3262 void Assembler::frstor(Address src) { 3263 InstructionMark im(this); 3264 emit_byte(0xDD); 3265 emit_operand32(rsp, src); 3266 } 3267 3268 void Assembler::fsin() { 3269 emit_byte(0xD9); 3270 emit_byte(0xFE); 3271 } 3272 3273 void Assembler::fsqrt() { 3274 emit_byte(0xD9); 3275 emit_byte(0xFA); 3276 } 3277 3278 void Assembler::fst_d(Address adr) { 3279 InstructionMark im(this); 3280 emit_byte(0xDD); 3281 emit_operand32(rdx, adr); 3282 } 3283 3284 void Assembler::fst_s(Address adr) { 3285 InstructionMark im(this); 3286 emit_byte(0xD9); 3287 emit_operand32(rdx, adr); 3288 } 3289 3290 void Assembler::fstp_d(Address adr) { 3291 InstructionMark im(this); 3292 emit_byte(0xDD); 3293 emit_operand32(rbx, adr); 3294 } 3295 3296 void Assembler::fstp_d(int index) { 3297 emit_farith(0xDD, 0xD8, index); 3298 } 3299 3300 void Assembler::fstp_s(Address adr) { 3301 InstructionMark im(this); 3302 emit_byte(0xD9); 3303 emit_operand32(rbx, adr); 3304 } 3305 3306 void Assembler::fstp_x(Address adr) { 3307 InstructionMark im(this); 3308 emit_byte(0xDB); 3309 emit_operand32(rdi, adr); 3310 } 3311 3312 void Assembler::fsub(int i) { 3313 emit_farith(0xD8, 0xE0, i); 3314 } 3315 3316 void Assembler::fsub_d(Address src) { 3317 InstructionMark im(this); 3318 emit_byte(0xDC); 3319 emit_operand32(rsp, src); 3320 } 3321 3322 void Assembler::fsub_s(Address src) { 3323 InstructionMark im(this); 3324 emit_byte(0xD8); 3325 emit_operand32(rsp, src); 3326 } 3327 3328 void Assembler::fsuba(int i) { 3329 emit_farith(0xDC, 0xE8, i); 3330 } 3331 3332 void Assembler::fsubp(int i) { 3333 emit_farith(0xDE, 0xE8, i); // ST(0) <- ST(0) - ST(1) and pop (Intel manual wrong) 3334 } 3335 3336 void Assembler::fsubr(int i) { 3337 emit_farith(0xD8, 0xE8, i); 3338 } 3339 3340 void Assembler::fsubr_d(Address src) { 3341 InstructionMark im(this); 3342 emit_byte(0xDC); 3343 emit_operand32(rbp, src); 3344 } 3345 3346 void Assembler::fsubr_s(Address src) { 3347 InstructionMark im(this); 3348 emit_byte(0xD8); 3349 emit_operand32(rbp, src); 3350 } 3351 3352 void Assembler::fsubra(int i) { 3353 emit_farith(0xDC, 0xE0, i); 3354 } 3355 3356 void Assembler::fsubrp(int i) { 3357 emit_farith(0xDE, 0xE0, i); // ST(0) <- ST(1) - ST(0) and pop (Intel manual wrong) 3358 } 3359 3360 void Assembler::ftan() { 3361 emit_byte(0xD9); 3362 emit_byte(0xF2); 3363 emit_byte(0xDD); 3364 emit_byte(0xD8); 3365 } 3366 3367 void Assembler::ftst() { 3368 emit_byte(0xD9); 3369 emit_byte(0xE4); 3370 } 3371 3372 void Assembler::fucomi(int i) { 3373 // make sure the instruction is supported (introduced for P6, together with cmov) 3374 guarantee(VM_Version::supports_cmov(), "illegal instruction"); 3375 emit_farith(0xDB, 0xE8, i); 3376 } 3377 3378 void Assembler::fucomip(int i) { 3379 // make sure the instruction is supported (introduced for P6, together with cmov) 3380 guarantee(VM_Version::supports_cmov(), "illegal instruction"); 3381 emit_farith(0xDF, 0xE8, i); 3382 } 3383 3384 void Assembler::fwait() { 3385 emit_byte(0x9B); 3386 } 3387 3388 void Assembler::fxch(int i) { 3389 emit_farith(0xD9, 0xC8, i); 3390 } 3391 3392 void Assembler::fyl2x() { 3393 emit_byte(0xD9); 3394 emit_byte(0xF1); 3395 } 3396 3397 3398 #ifndef _LP64 3399 3400 void Assembler::incl(Register dst) { 3401 // Don't use it directly. Use MacroAssembler::incrementl() instead. 3402 emit_byte(0x40 | dst->encoding()); 3403 } 3404 3405 void Assembler::lea(Register dst, Address src) { 3406 leal(dst, src); 3407 } 3408 3409 void Assembler::mov_literal32(Address dst, int32_t imm32, RelocationHolder const& rspec) { 3410 InstructionMark im(this); 3411 emit_byte(0xC7); 3412 emit_operand(rax, dst); 3413 emit_data((int)imm32, rspec, 0); 3414 } 3415 3416 void Assembler::mov_literal32(Register dst, int32_t imm32, RelocationHolder const& rspec) { 3417 InstructionMark im(this); 3418 int encode = prefix_and_encode(dst->encoding()); 3419 emit_byte(0xB8 | encode); 3420 emit_data((int)imm32, rspec, 0); 3421 } 3422 3423 void Assembler::popa() { // 32bit 3424 emit_byte(0x61); 3425 } 3426 3427 void Assembler::push_literal32(int32_t imm32, RelocationHolder const& rspec) { 3428 InstructionMark im(this); 3429 emit_byte(0x68); 3430 emit_data(imm32, rspec, 0); 3431 } 3432 3433 void Assembler::pusha() { // 32bit 3434 emit_byte(0x60); 3435 } 3436 3437 void Assembler::set_byte_if_not_zero(Register dst) { 3438 emit_byte(0x0F); 3439 emit_byte(0x95); 3440 emit_byte(0xE0 | dst->encoding()); 3441 } 3442 3443 void Assembler::shldl(Register dst, Register src) { 3444 emit_byte(0x0F); 3445 emit_byte(0xA5); 3446 emit_byte(0xC0 | src->encoding() << 3 | dst->encoding()); 3447 } 3448 3449 void Assembler::shrdl(Register dst, Register src) { 3450 emit_byte(0x0F); 3451 emit_byte(0xAD); 3452 emit_byte(0xC0 | src->encoding() << 3 | dst->encoding()); 3453 } 3454 3455 #else // LP64 3456 3457 void Assembler::set_byte_if_not_zero(Register dst) { 3458 int enc = prefix_and_encode(dst->encoding(), true); 3459 emit_byte(0x0F); 3460 emit_byte(0x95); 3461 emit_byte(0xE0 | enc); 3462 } 3463 3464 // 64bit only pieces of the assembler 3465 // This should only be used by 64bit instructions that can use rip-relative 3466 // it cannot be used by instructions that want an immediate value. 3467 3468 bool Assembler::reachable(AddressLiteral adr) { 3469 int64_t disp; 3470 // None will force a 64bit literal to the code stream. Likely a placeholder 3471 // for something that will be patched later and we need to certain it will 3472 // always be reachable. 3473 if (adr.reloc() == relocInfo::none) { 3474 return false; 3475 } 3476 if (adr.reloc() == relocInfo::internal_word_type) { 3477 // This should be rip relative and easily reachable. 3478 return true; 3479 } 3480 if (adr.reloc() == relocInfo::virtual_call_type || 3481 adr.reloc() == relocInfo::opt_virtual_call_type || 3482 adr.reloc() == relocInfo::static_call_type || 3483 adr.reloc() == relocInfo::static_stub_type ) { 3484 // This should be rip relative within the code cache and easily 3485 // reachable until we get huge code caches. (At which point 3486 // ic code is going to have issues). 3487 return true; 3488 } 3489 if (adr.reloc() != relocInfo::external_word_type && 3490 adr.reloc() != relocInfo::poll_return_type && // these are really external_word but need special 3491 adr.reloc() != relocInfo::poll_type && // relocs to identify them 3492 adr.reloc() != relocInfo::runtime_call_type ) { 3493 return false; 3494 } 3495 3496 // Stress the correction code 3497 if (ForceUnreachable) { 3498 // Must be runtimecall reloc, see if it is in the codecache 3499 // Flipping stuff in the codecache to be unreachable causes issues 3500 // with things like inline caches where the additional instructions 3501 // are not handled. 3502 if (CodeCache::find_blob(adr._target) == NULL) { 3503 return false; 3504 } 3505 } 3506 // For external_word_type/runtime_call_type if it is reachable from where we 3507 // are now (possibly a temp buffer) and where we might end up 3508 // anywhere in the codeCache then we are always reachable. 3509 // This would have to change if we ever save/restore shared code 3510 // to be more pessimistic. 3511 disp = (int64_t)adr._target - ((int64_t)CodeCache::low_bound() + sizeof(int)); 3512 if (!is_simm32(disp)) return false; 3513 disp = (int64_t)adr._target - ((int64_t)CodeCache::high_bound() + sizeof(int)); 3514 if (!is_simm32(disp)) return false; 3515 3516 disp = (int64_t)adr._target - ((int64_t)_code_pos + sizeof(int)); 3517 3518 // Because rip relative is a disp + address_of_next_instruction and we 3519 // don't know the value of address_of_next_instruction we apply a fudge factor 3520 // to make sure we will be ok no matter the size of the instruction we get placed into. 3521 // We don't have to fudge the checks above here because they are already worst case. 3522 3523 // 12 == override/rex byte, opcode byte, rm byte, sib byte, a 4-byte disp , 4-byte literal 3524 // + 4 because better safe than sorry. 3525 const int fudge = 12 + 4; 3526 if (disp < 0) { 3527 disp -= fudge; 3528 } else { 3529 disp += fudge; 3530 } 3531 return is_simm32(disp); 3532 } 3533 3534 // Check if the polling page is not reachable from the code cache using rip-relative 3535 // addressing. 3536 bool Assembler::is_polling_page_far() { 3537 intptr_t addr = (intptr_t)os::get_polling_page(); 3538 return !is_simm32(addr - (intptr_t)CodeCache::low_bound()) || 3539 !is_simm32(addr - (intptr_t)CodeCache::high_bound()); 3540 } 3541 3542 void Assembler::emit_data64(jlong data, 3543 relocInfo::relocType rtype, 3544 int format) { 3545 if (rtype == relocInfo::none) { 3546 emit_long64(data); 3547 } else { 3548 emit_data64(data, Relocation::spec_simple(rtype), format); 3549 } 3550 } 3551 3552 void Assembler::emit_data64(jlong data, 3553 RelocationHolder const& rspec, 3554 int format) { 3555 assert(imm_operand == 0, "default format must be immediate in this file"); 3556 assert(imm_operand == format, "must be immediate"); 3557 assert(inst_mark() != NULL, "must be inside InstructionMark"); 3558 // Do not use AbstractAssembler::relocate, which is not intended for 3559 // embedded words. Instead, relocate to the enclosing instruction. 3560 code_section()->relocate(inst_mark(), rspec, format); 3561 #ifdef ASSERT 3562 check_relocation(rspec, format); 3563 #endif 3564 emit_long64(data); 3565 } 3566 3567 int Assembler::prefix_and_encode(int reg_enc, bool byteinst) { 3568 if (reg_enc >= 8) { 3569 prefix(REX_B); 3570 reg_enc -= 8; 3571 } else if (byteinst && reg_enc >= 4) { 3572 prefix(REX); 3573 } 3574 return reg_enc; 3575 } 3576 3577 int Assembler::prefixq_and_encode(int reg_enc) { 3578 if (reg_enc < 8) { 3579 prefix(REX_W); 3580 } else { 3581 prefix(REX_WB); 3582 reg_enc -= 8; 3583 } 3584 return reg_enc; 3585 } 3586 3587 int Assembler::prefix_and_encode(int dst_enc, int src_enc, bool byteinst) { 3588 if (dst_enc < 8) { 3589 if (src_enc >= 8) { 3590 prefix(REX_B); 3591 src_enc -= 8; 3592 } else if (byteinst && src_enc >= 4) { 3593 prefix(REX); 3594 } 3595 } else { 3596 if (src_enc < 8) { 3597 prefix(REX_R); 3598 } else { 3599 prefix(REX_RB); 3600 src_enc -= 8; 3601 } 3602 dst_enc -= 8; 3603 } 3604 return dst_enc << 3 | src_enc; 3605 } 3606 3607 int Assembler::prefixq_and_encode(int dst_enc, int src_enc) { 3608 if (dst_enc < 8) { 3609 if (src_enc < 8) { 3610 prefix(REX_W); 3611 } else { 3612 prefix(REX_WB); 3613 src_enc -= 8; 3614 } 3615 } else { 3616 if (src_enc < 8) { 3617 prefix(REX_WR); 3618 } else { 3619 prefix(REX_WRB); 3620 src_enc -= 8; 3621 } 3622 dst_enc -= 8; 3623 } 3624 return dst_enc << 3 | src_enc; 3625 } 3626 3627 void Assembler::prefix(Register reg) { 3628 if (reg->encoding() >= 8) { 3629 prefix(REX_B); 3630 } 3631 } 3632 3633 void Assembler::prefix(Address adr) { 3634 if (adr.base_needs_rex()) { 3635 if (adr.index_needs_rex()) { 3636 prefix(REX_XB); 3637 } else { 3638 prefix(REX_B); 3639 } 3640 } else { 3641 if (adr.index_needs_rex()) { 3642 prefix(REX_X); 3643 } 3644 } 3645 } 3646 3647 void Assembler::prefixq(Address adr) { 3648 if (adr.base_needs_rex()) { 3649 if (adr.index_needs_rex()) { 3650 prefix(REX_WXB); 3651 } else { 3652 prefix(REX_WB); 3653 } 3654 } else { 3655 if (adr.index_needs_rex()) { 3656 prefix(REX_WX); 3657 } else { 3658 prefix(REX_W); 3659 } 3660 } 3661 } 3662 3663 3664 void Assembler::prefix(Address adr, Register reg, bool byteinst) { 3665 if (reg->encoding() < 8) { 3666 if (adr.base_needs_rex()) { 3667 if (adr.index_needs_rex()) { 3668 prefix(REX_XB); 3669 } else { 3670 prefix(REX_B); 3671 } 3672 } else { 3673 if (adr.index_needs_rex()) { 3674 prefix(REX_X); 3675 } else if (reg->encoding() >= 4 ) { 3676 prefix(REX); 3677 } 3678 } 3679 } else { 3680 if (adr.base_needs_rex()) { 3681 if (adr.index_needs_rex()) { 3682 prefix(REX_RXB); 3683 } else { 3684 prefix(REX_RB); 3685 } 3686 } else { 3687 if (adr.index_needs_rex()) { 3688 prefix(REX_RX); 3689 } else { 3690 prefix(REX_R); 3691 } 3692 } 3693 } 3694 } 3695 3696 void Assembler::prefixq(Address adr, Register src) { 3697 if (src->encoding() < 8) { 3698 if (adr.base_needs_rex()) { 3699 if (adr.index_needs_rex()) { 3700 prefix(REX_WXB); 3701 } else { 3702 prefix(REX_WB); 3703 } 3704 } else { 3705 if (adr.index_needs_rex()) { 3706 prefix(REX_WX); 3707 } else { 3708 prefix(REX_W); 3709 } 3710 } 3711 } else { 3712 if (adr.base_needs_rex()) { 3713 if (adr.index_needs_rex()) { 3714 prefix(REX_WRXB); 3715 } else { 3716 prefix(REX_WRB); 3717 } 3718 } else { 3719 if (adr.index_needs_rex()) { 3720 prefix(REX_WRX); 3721 } else { 3722 prefix(REX_WR); 3723 } 3724 } 3725 } 3726 } 3727 3728 void Assembler::prefix(Address adr, XMMRegister reg) { 3729 if (reg->encoding() < 8) { 3730 if (adr.base_needs_rex()) { 3731 if (adr.index_needs_rex()) { 3732 prefix(REX_XB); 3733 } else { 3734 prefix(REX_B); 3735 } 3736 } else { 3737 if (adr.index_needs_rex()) { 3738 prefix(REX_X); 3739 } 3740 } 3741 } else { 3742 if (adr.base_needs_rex()) { 3743 if (adr.index_needs_rex()) { 3744 prefix(REX_RXB); 3745 } else { 3746 prefix(REX_RB); 3747 } 3748 } else { 3749 if (adr.index_needs_rex()) { 3750 prefix(REX_RX); 3751 } else { 3752 prefix(REX_R); 3753 } 3754 } 3755 } 3756 } 3757 3758 void Assembler::adcq(Register dst, int32_t imm32) { 3759 (void) prefixq_and_encode(dst->encoding()); 3760 emit_arith(0x81, 0xD0, dst, imm32); 3761 } 3762 3763 void Assembler::adcq(Register dst, Address src) { 3764 InstructionMark im(this); 3765 prefixq(src, dst); 3766 emit_byte(0x13); 3767 emit_operand(dst, src); 3768 } 3769 3770 void Assembler::adcq(Register dst, Register src) { 3771 (int) prefixq_and_encode(dst->encoding(), src->encoding()); 3772 emit_arith(0x13, 0xC0, dst, src); 3773 } 3774 3775 void Assembler::addq(Address dst, int32_t imm32) { 3776 InstructionMark im(this); 3777 prefixq(dst); 3778 emit_arith_operand(0x81, rax, dst,imm32); 3779 } 3780 3781 void Assembler::addq(Address dst, Register src) { 3782 InstructionMark im(this); 3783 prefixq(dst, src); 3784 emit_byte(0x01); 3785 emit_operand(src, dst); 3786 } 3787 3788 void Assembler::addq(Register dst, int32_t imm32) { 3789 (void) prefixq_and_encode(dst->encoding()); 3790 emit_arith(0x81, 0xC0, dst, imm32); 3791 } 3792 3793 void Assembler::addq(Register dst, Address src) { 3794 InstructionMark im(this); 3795 prefixq(src, dst); 3796 emit_byte(0x03); 3797 emit_operand(dst, src); 3798 } 3799 3800 void Assembler::addq(Register dst, Register src) { 3801 (void) prefixq_and_encode(dst->encoding(), src->encoding()); 3802 emit_arith(0x03, 0xC0, dst, src); 3803 } 3804 3805 void Assembler::andq(Address dst, int32_t imm32) { 3806 InstructionMark im(this); 3807 prefixq(dst); 3808 emit_byte(0x81); 3809 emit_operand(rsp, dst, 4); 3810 emit_long(imm32); 3811 } 3812 3813 void Assembler::andq(Register dst, int32_t imm32) { 3814 (void) prefixq_and_encode(dst->encoding()); 3815 emit_arith(0x81, 0xE0, dst, imm32); 3816 } 3817 3818 void Assembler::andq(Register dst, Address src) { 3819 InstructionMark im(this); 3820 prefixq(src, dst); 3821 emit_byte(0x23); 3822 emit_operand(dst, src); 3823 } 3824 3825 void Assembler::andq(Register dst, Register src) { 3826 (int) prefixq_and_encode(dst->encoding(), src->encoding()); 3827 emit_arith(0x23, 0xC0, dst, src); 3828 } 3829 3830 void Assembler::bsfq(Register dst, Register src) { 3831 int encode = prefixq_and_encode(dst->encoding(), src->encoding()); 3832 emit_byte(0x0F); 3833 emit_byte(0xBC); 3834 emit_byte(0xC0 | encode); 3835 } 3836 3837 void Assembler::bsrq(Register dst, Register src) { 3838 assert(!VM_Version::supports_lzcnt(), "encoding is treated as LZCNT"); 3839 int encode = prefixq_and_encode(dst->encoding(), src->encoding()); 3840 emit_byte(0x0F); 3841 emit_byte(0xBD); 3842 emit_byte(0xC0 | encode); 3843 } 3844 3845 void Assembler::bswapq(Register reg) { 3846 int encode = prefixq_and_encode(reg->encoding()); 3847 emit_byte(0x0F); 3848 emit_byte(0xC8 | encode); 3849 } 3850 3851 void Assembler::cdqq() { 3852 prefix(REX_W); 3853 emit_byte(0x99); 3854 } 3855 3856 void Assembler::clflush(Address adr) { 3857 prefix(adr); 3858 emit_byte(0x0F); 3859 emit_byte(0xAE); 3860 emit_operand(rdi, adr); 3861 } 3862 3863 void Assembler::cmovq(Condition cc, Register dst, Register src) { 3864 int encode = prefixq_and_encode(dst->encoding(), src->encoding()); 3865 emit_byte(0x0F); 3866 emit_byte(0x40 | cc); 3867 emit_byte(0xC0 | encode); 3868 } 3869 3870 void Assembler::cmovq(Condition cc, Register dst, Address src) { 3871 InstructionMark im(this); 3872 prefixq(src, dst); 3873 emit_byte(0x0F); 3874 emit_byte(0x40 | cc); 3875 emit_operand(dst, src); 3876 } 3877 3878 void Assembler::cmpq(Address dst, int32_t imm32) { 3879 InstructionMark im(this); 3880 prefixq(dst); 3881 emit_byte(0x81); 3882 emit_operand(rdi, dst, 4); 3883 emit_long(imm32); 3884 } 3885 3886 void Assembler::cmpq(Register dst, int32_t imm32) { 3887 (void) prefixq_and_encode(dst->encoding()); 3888 emit_arith(0x81, 0xF8, dst, imm32); 3889 } 3890 3891 void Assembler::cmpq(Address dst, Register src) { 3892 InstructionMark im(this); 3893 prefixq(dst, src); 3894 emit_byte(0x3B); 3895 emit_operand(src, dst); 3896 } 3897 3898 void Assembler::cmpq(Register dst, Register src) { 3899 (void) prefixq_and_encode(dst->encoding(), src->encoding()); 3900 emit_arith(0x3B, 0xC0, dst, src); 3901 } 3902 3903 void Assembler::cmpq(Register dst, Address src) { 3904 InstructionMark im(this); 3905 prefixq(src, dst); 3906 emit_byte(0x3B); 3907 emit_operand(dst, src); 3908 } 3909 3910 void Assembler::cmpxchgq(Register reg, Address adr) { 3911 InstructionMark im(this); 3912 prefixq(adr, reg); 3913 emit_byte(0x0F); 3914 emit_byte(0xB1); 3915 emit_operand(reg, adr); 3916 } 3917 3918 void Assembler::cvtsi2sdq(XMMRegister dst, Register src) { 3919 NOT_LP64(assert(VM_Version::supports_sse2(), "")); 3920 emit_byte(0xF2); 3921 int encode = prefixq_and_encode(dst->encoding(), src->encoding()); 3922 emit_byte(0x0F); 3923 emit_byte(0x2A); 3924 emit_byte(0xC0 | encode); 3925 } 3926 3927 void Assembler::cvtsi2ssq(XMMRegister dst, Register src) { 3928 NOT_LP64(assert(VM_Version::supports_sse(), "")); 3929 emit_byte(0xF3); 3930 int encode = prefixq_and_encode(dst->encoding(), src->encoding()); 3931 emit_byte(0x0F); 3932 emit_byte(0x2A); 3933 emit_byte(0xC0 | encode); 3934 } 3935 3936 void Assembler::cvttsd2siq(Register dst, XMMRegister src) { 3937 NOT_LP64(assert(VM_Version::supports_sse2(), "")); 3938 emit_byte(0xF2); 3939 int encode = prefixq_and_encode(dst->encoding(), src->encoding()); 3940 emit_byte(0x0F); 3941 emit_byte(0x2C); 3942 emit_byte(0xC0 | encode); 3943 } 3944 3945 void Assembler::cvttss2siq(Register dst, XMMRegister src) { 3946 NOT_LP64(assert(VM_Version::supports_sse(), "")); 3947 emit_byte(0xF3); 3948 int encode = prefixq_and_encode(dst->encoding(), src->encoding()); 3949 emit_byte(0x0F); 3950 emit_byte(0x2C); 3951 emit_byte(0xC0 | encode); 3952 } 3953 3954 void Assembler::decl(Register dst) { 3955 // Don't use it directly. Use MacroAssembler::decrementl() instead. 3956 // Use two-byte form (one-byte form is a REX prefix in 64-bit mode) 3957 int encode = prefix_and_encode(dst->encoding()); 3958 emit_byte(0xFF); 3959 emit_byte(0xC8 | encode); 3960 } 3961 3962 void Assembler::decq(Register dst) { 3963 // Don't use it directly. Use MacroAssembler::decrementq() instead. 3964 // Use two-byte form (one-byte from is a REX prefix in 64-bit mode) 3965 int encode = prefixq_and_encode(dst->encoding()); 3966 emit_byte(0xFF); 3967 emit_byte(0xC8 | encode); 3968 } 3969 3970 void Assembler::decq(Address dst) { 3971 // Don't use it directly. Use MacroAssembler::decrementq() instead. 3972 InstructionMark im(this); 3973 prefixq(dst); 3974 emit_byte(0xFF); 3975 emit_operand(rcx, dst); 3976 } 3977 3978 void Assembler::fxrstor(Address src) { 3979 prefixq(src); 3980 emit_byte(0x0F); 3981 emit_byte(0xAE); 3982 emit_operand(as_Register(1), src); 3983 } 3984 3985 void Assembler::fxsave(Address dst) { 3986 prefixq(dst); 3987 emit_byte(0x0F); 3988 emit_byte(0xAE); 3989 emit_operand(as_Register(0), dst); 3990 } 3991 3992 void Assembler::idivq(Register src) { 3993 int encode = prefixq_and_encode(src->encoding()); 3994 emit_byte(0xF7); 3995 emit_byte(0xF8 | encode); 3996 } 3997 3998 void Assembler::imulq(Register dst, Register src) { 3999 int encode = prefixq_and_encode(dst->encoding(), src->encoding()); 4000 emit_byte(0x0F); 4001 emit_byte(0xAF); 4002 emit_byte(0xC0 | encode); 4003 } 4004 4005 void Assembler::imulq(Register dst, Register src, int value) { 4006 int encode = prefixq_and_encode(dst->encoding(), src->encoding()); 4007 if (is8bit(value)) { 4008 emit_byte(0x6B); 4009 emit_byte(0xC0 | encode); 4010 emit_byte(value & 0xFF); 4011 } else { 4012 emit_byte(0x69); 4013 emit_byte(0xC0 | encode); 4014 emit_long(value); 4015 } 4016 } 4017 4018 void Assembler::incl(Register dst) { 4019 // Don't use it directly. Use MacroAssembler::incrementl() instead. 4020 // Use two-byte form (one-byte from is a REX prefix in 64-bit mode) 4021 int encode = prefix_and_encode(dst->encoding()); 4022 emit_byte(0xFF); 4023 emit_byte(0xC0 | encode); 4024 } 4025 4026 void Assembler::incq(Register dst) { 4027 // Don't use it directly. Use MacroAssembler::incrementq() instead. 4028 // Use two-byte form (one-byte from is a REX prefix in 64-bit mode) 4029 int encode = prefixq_and_encode(dst->encoding()); 4030 emit_byte(0xFF); 4031 emit_byte(0xC0 | encode); 4032 } 4033 4034 void Assembler::incq(Address dst) { 4035 // Don't use it directly. Use MacroAssembler::incrementq() instead. 4036 InstructionMark im(this); 4037 prefixq(dst); 4038 emit_byte(0xFF); 4039 emit_operand(rax, dst); 4040 } 4041 4042 void Assembler::lea(Register dst, Address src) { 4043 leaq(dst, src); 4044 } 4045 4046 void Assembler::leaq(Register dst, Address src) { 4047 InstructionMark im(this); 4048 prefixq(src, dst); 4049 emit_byte(0x8D); 4050 emit_operand(dst, src); 4051 } 4052 4053 void Assembler::mov64(Register dst, int64_t imm64) { 4054 InstructionMark im(this); 4055 int encode = prefixq_and_encode(dst->encoding()); 4056 emit_byte(0xB8 | encode); 4057 emit_long64(imm64); 4058 } 4059 4060 void Assembler::mov_literal64(Register dst, intptr_t imm64, RelocationHolder const& rspec) { 4061 InstructionMark im(this); 4062 int encode = prefixq_and_encode(dst->encoding()); 4063 emit_byte(0xB8 | encode); 4064 emit_data64(imm64, rspec); 4065 } 4066 4067 void Assembler::mov_narrow_oop(Register dst, int32_t imm32, RelocationHolder const& rspec) { 4068 InstructionMark im(this); 4069 int encode = prefix_and_encode(dst->encoding()); 4070 emit_byte(0xB8 | encode); 4071 emit_data((int)imm32, rspec, narrow_oop_operand); 4072 } 4073 4074 void Assembler::mov_narrow_oop(Address dst, int32_t imm32, RelocationHolder const& rspec) { 4075 InstructionMark im(this); 4076 prefix(dst); 4077 emit_byte(0xC7); 4078 emit_operand(rax, dst, 4); 4079 emit_data((int)imm32, rspec, narrow_oop_operand); 4080 } 4081 4082 void Assembler::cmp_narrow_oop(Register src1, int32_t imm32, RelocationHolder const& rspec) { 4083 InstructionMark im(this); 4084 int encode = prefix_and_encode(src1->encoding()); 4085 emit_byte(0x81); 4086 emit_byte(0xF8 | encode); 4087 emit_data((int)imm32, rspec, narrow_oop_operand); 4088 } 4089 4090 void Assembler::cmp_narrow_oop(Address src1, int32_t imm32, RelocationHolder const& rspec) { 4091 InstructionMark im(this); 4092 prefix(src1); 4093 emit_byte(0x81); 4094 emit_operand(rax, src1, 4); 4095 emit_data((int)imm32, rspec, narrow_oop_operand); 4096 } 4097 4098 void Assembler::lzcntq(Register dst, Register src) { 4099 assert(VM_Version::supports_lzcnt(), "encoding is treated as BSR"); 4100 emit_byte(0xF3); 4101 int encode = prefixq_and_encode(dst->encoding(), src->encoding()); 4102 emit_byte(0x0F); 4103 emit_byte(0xBD); 4104 emit_byte(0xC0 | encode); 4105 } 4106 4107 void Assembler::movdq(XMMRegister dst, Register src) { 4108 // table D-1 says MMX/SSE2 4109 NOT_LP64(assert(VM_Version::supports_sse2() || VM_Version::supports_mmx(), "")); 4110 emit_byte(0x66); 4111 int encode = prefixq_and_encode(dst->encoding(), src->encoding()); 4112 emit_byte(0x0F); 4113 emit_byte(0x6E); 4114 emit_byte(0xC0 | encode); 4115 } 4116 4117 void Assembler::movdq(Register dst, XMMRegister src) { 4118 // table D-1 says MMX/SSE2 4119 NOT_LP64(assert(VM_Version::supports_sse2() || VM_Version::supports_mmx(), "")); 4120 emit_byte(0x66); 4121 // swap src/dst to get correct prefix 4122 int encode = prefixq_and_encode(src->encoding(), dst->encoding()); 4123 emit_byte(0x0F); 4124 emit_byte(0x7E); 4125 emit_byte(0xC0 | encode); 4126 } 4127 4128 void Assembler::movq(Register dst, Register src) { 4129 int encode = prefixq_and_encode(dst->encoding(), src->encoding()); 4130 emit_byte(0x8B); 4131 emit_byte(0xC0 | encode); 4132 } 4133 4134 void Assembler::movq(Register dst, Address src) { 4135 InstructionMark im(this); 4136 prefixq(src, dst); 4137 emit_byte(0x8B); 4138 emit_operand(dst, src); 4139 } 4140 4141 void Assembler::movq(Address dst, Register src) { 4142 InstructionMark im(this); 4143 prefixq(dst, src); 4144 emit_byte(0x89); 4145 emit_operand(src, dst); 4146 } 4147 4148 void Assembler::movsbq(Register dst, Address src) { 4149 InstructionMark im(this); 4150 prefixq(src, dst); 4151 emit_byte(0x0F); 4152 emit_byte(0xBE); 4153 emit_operand(dst, src); 4154 } 4155 4156 void Assembler::movsbq(Register dst, Register src) { 4157 int encode = prefixq_and_encode(dst->encoding(), src->encoding()); 4158 emit_byte(0x0F); 4159 emit_byte(0xBE); 4160 emit_byte(0xC0 | encode); 4161 } 4162 4163 void Assembler::movslq(Register dst, int32_t imm32) { 4164 // dbx shows movslq(rcx, 3) as movq $0x0000000049000000,(%rbx) 4165 // and movslq(r8, 3); as movl $0x0000000048000000,(%rbx) 4166 // as a result we shouldn't use until tested at runtime... 4167 ShouldNotReachHere(); 4168 InstructionMark im(this); 4169 int encode = prefixq_and_encode(dst->encoding()); 4170 emit_byte(0xC7 | encode); 4171 emit_long(imm32); 4172 } 4173 4174 void Assembler::movslq(Address dst, int32_t imm32) { 4175 assert(is_simm32(imm32), "lost bits"); 4176 InstructionMark im(this); 4177 prefixq(dst); 4178 emit_byte(0xC7); 4179 emit_operand(rax, dst, 4); 4180 emit_long(imm32); 4181 } 4182 4183 void Assembler::movslq(Register dst, Address src) { 4184 InstructionMark im(this); 4185 prefixq(src, dst); 4186 emit_byte(0x63); 4187 emit_operand(dst, src); 4188 } 4189 4190 void Assembler::movslq(Register dst, Register src) { 4191 int encode = prefixq_and_encode(dst->encoding(), src->encoding()); 4192 emit_byte(0x63); 4193 emit_byte(0xC0 | encode); 4194 } 4195 4196 void Assembler::movswq(Register dst, Address src) { 4197 InstructionMark im(this); 4198 prefixq(src, dst); 4199 emit_byte(0x0F); 4200 emit_byte(0xBF); 4201 emit_operand(dst, src); 4202 } 4203 4204 void Assembler::movswq(Register dst, Register src) { 4205 int encode = prefixq_and_encode(dst->encoding(), src->encoding()); 4206 emit_byte(0x0F); 4207 emit_byte(0xBF); 4208 emit_byte(0xC0 | encode); 4209 } 4210 4211 void Assembler::movzbq(Register dst, Address src) { 4212 InstructionMark im(this); 4213 prefixq(src, dst); 4214 emit_byte(0x0F); 4215 emit_byte(0xB6); 4216 emit_operand(dst, src); 4217 } 4218 4219 void Assembler::movzbq(Register dst, Register src) { 4220 int encode = prefixq_and_encode(dst->encoding(), src->encoding()); 4221 emit_byte(0x0F); 4222 emit_byte(0xB6); 4223 emit_byte(0xC0 | encode); 4224 } 4225 4226 void Assembler::movzwq(Register dst, Address src) { 4227 InstructionMark im(this); 4228 prefixq(src, dst); 4229 emit_byte(0x0F); 4230 emit_byte(0xB7); 4231 emit_operand(dst, src); 4232 } 4233 4234 void Assembler::movzwq(Register dst, Register src) { 4235 int encode = prefixq_and_encode(dst->encoding(), src->encoding()); 4236 emit_byte(0x0F); 4237 emit_byte(0xB7); 4238 emit_byte(0xC0 | encode); 4239 } 4240 4241 void Assembler::negq(Register dst) { 4242 int encode = prefixq_and_encode(dst->encoding()); 4243 emit_byte(0xF7); 4244 emit_byte(0xD8 | encode); 4245 } 4246 4247 void Assembler::notq(Register dst) { 4248 int encode = prefixq_and_encode(dst->encoding()); 4249 emit_byte(0xF7); 4250 emit_byte(0xD0 | encode); 4251 } 4252 4253 void Assembler::orq(Address dst, int32_t imm32) { 4254 InstructionMark im(this); 4255 prefixq(dst); 4256 emit_byte(0x81); 4257 emit_operand(rcx, dst, 4); 4258 emit_long(imm32); 4259 } 4260 4261 void Assembler::orq(Register dst, int32_t imm32) { 4262 (void) prefixq_and_encode(dst->encoding()); 4263 emit_arith(0x81, 0xC8, dst, imm32); 4264 } 4265 4266 void Assembler::orq(Register dst, Address src) { 4267 InstructionMark im(this); 4268 prefixq(src, dst); 4269 emit_byte(0x0B); 4270 emit_operand(dst, src); 4271 } 4272 4273 void Assembler::orq(Register dst, Register src) { 4274 (void) prefixq_and_encode(dst->encoding(), src->encoding()); 4275 emit_arith(0x0B, 0xC0, dst, src); 4276 } 4277 4278 void Assembler::popa() { // 64bit 4279 movq(r15, Address(rsp, 0)); 4280 movq(r14, Address(rsp, wordSize)); 4281 movq(r13, Address(rsp, 2 * wordSize)); 4282 movq(r12, Address(rsp, 3 * wordSize)); 4283 movq(r11, Address(rsp, 4 * wordSize)); 4284 movq(r10, Address(rsp, 5 * wordSize)); 4285 movq(r9, Address(rsp, 6 * wordSize)); 4286 movq(r8, Address(rsp, 7 * wordSize)); 4287 movq(rdi, Address(rsp, 8 * wordSize)); 4288 movq(rsi, Address(rsp, 9 * wordSize)); 4289 movq(rbp, Address(rsp, 10 * wordSize)); 4290 // skip rsp 4291 movq(rbx, Address(rsp, 12 * wordSize)); 4292 movq(rdx, Address(rsp, 13 * wordSize)); 4293 movq(rcx, Address(rsp, 14 * wordSize)); 4294 movq(rax, Address(rsp, 15 * wordSize)); 4295 4296 addq(rsp, 16 * wordSize); 4297 } 4298 4299 void Assembler::popcntq(Register dst, Address src) { 4300 assert(VM_Version::supports_popcnt(), "must support"); 4301 InstructionMark im(this); 4302 emit_byte(0xF3); 4303 prefixq(src, dst); 4304 emit_byte(0x0F); 4305 emit_byte(0xB8); 4306 emit_operand(dst, src); 4307 } 4308 4309 void Assembler::popcntq(Register dst, Register src) { 4310 assert(VM_Version::supports_popcnt(), "must support"); 4311 emit_byte(0xF3); 4312 int encode = prefixq_and_encode(dst->encoding(), src->encoding()); 4313 emit_byte(0x0F); 4314 emit_byte(0xB8); 4315 emit_byte(0xC0 | encode); 4316 } 4317 4318 void Assembler::popq(Address dst) { 4319 InstructionMark im(this); 4320 prefixq(dst); 4321 emit_byte(0x8F); 4322 emit_operand(rax, dst); 4323 } 4324 4325 void Assembler::pusha() { // 64bit 4326 // we have to store original rsp. ABI says that 128 bytes 4327 // below rsp are local scratch. 4328 movq(Address(rsp, -5 * wordSize), rsp); 4329 4330 subq(rsp, 16 * wordSize); 4331 4332 movq(Address(rsp, 15 * wordSize), rax); 4333 movq(Address(rsp, 14 * wordSize), rcx); 4334 movq(Address(rsp, 13 * wordSize), rdx); 4335 movq(Address(rsp, 12 * wordSize), rbx); 4336 // skip rsp 4337 movq(Address(rsp, 10 * wordSize), rbp); 4338 movq(Address(rsp, 9 * wordSize), rsi); 4339 movq(Address(rsp, 8 * wordSize), rdi); 4340 movq(Address(rsp, 7 * wordSize), r8); 4341 movq(Address(rsp, 6 * wordSize), r9); 4342 movq(Address(rsp, 5 * wordSize), r10); 4343 movq(Address(rsp, 4 * wordSize), r11); 4344 movq(Address(rsp, 3 * wordSize), r12); 4345 movq(Address(rsp, 2 * wordSize), r13); 4346 movq(Address(rsp, wordSize), r14); 4347 movq(Address(rsp, 0), r15); 4348 } 4349 4350 void Assembler::pushq(Address src) { 4351 InstructionMark im(this); 4352 prefixq(src); 4353 emit_byte(0xFF); 4354 emit_operand(rsi, src); 4355 } 4356 4357 void Assembler::rclq(Register dst, int imm8) { 4358 assert(isShiftCount(imm8 >> 1), "illegal shift count"); 4359 int encode = prefixq_and_encode(dst->encoding()); 4360 if (imm8 == 1) { 4361 emit_byte(0xD1); 4362 emit_byte(0xD0 | encode); 4363 } else { 4364 emit_byte(0xC1); 4365 emit_byte(0xD0 | encode); 4366 emit_byte(imm8); 4367 } 4368 } 4369 void Assembler::sarq(Register dst, int imm8) { 4370 assert(isShiftCount(imm8 >> 1), "illegal shift count"); 4371 int encode = prefixq_and_encode(dst->encoding()); 4372 if (imm8 == 1) { 4373 emit_byte(0xD1); 4374 emit_byte(0xF8 | encode); 4375 } else { 4376 emit_byte(0xC1); 4377 emit_byte(0xF8 | encode); 4378 emit_byte(imm8); 4379 } 4380 } 4381 4382 void Assembler::sarq(Register dst) { 4383 int encode = prefixq_and_encode(dst->encoding()); 4384 emit_byte(0xD3); 4385 emit_byte(0xF8 | encode); 4386 } 4387 4388 void Assembler::sbbq(Address dst, int32_t imm32) { 4389 InstructionMark im(this); 4390 prefixq(dst); 4391 emit_arith_operand(0x81, rbx, dst, imm32); 4392 } 4393 4394 void Assembler::sbbq(Register dst, int32_t imm32) { 4395 (void) prefixq_and_encode(dst->encoding()); 4396 emit_arith(0x81, 0xD8, dst, imm32); 4397 } 4398 4399 void Assembler::sbbq(Register dst, Address src) { 4400 InstructionMark im(this); 4401 prefixq(src, dst); 4402 emit_byte(0x1B); 4403 emit_operand(dst, src); 4404 } 4405 4406 void Assembler::sbbq(Register dst, Register src) { 4407 (void) prefixq_and_encode(dst->encoding(), src->encoding()); 4408 emit_arith(0x1B, 0xC0, dst, src); 4409 } 4410 4411 void Assembler::shlq(Register dst, int imm8) { 4412 assert(isShiftCount(imm8 >> 1), "illegal shift count"); 4413 int encode = prefixq_and_encode(dst->encoding()); 4414 if (imm8 == 1) { 4415 emit_byte(0xD1); 4416 emit_byte(0xE0 | encode); 4417 } else { 4418 emit_byte(0xC1); 4419 emit_byte(0xE0 | encode); 4420 emit_byte(imm8); 4421 } 4422 } 4423 4424 void Assembler::shlq(Register dst) { 4425 int encode = prefixq_and_encode(dst->encoding()); 4426 emit_byte(0xD3); 4427 emit_byte(0xE0 | encode); 4428 } 4429 4430 void Assembler::shrq(Register dst, int imm8) { 4431 assert(isShiftCount(imm8 >> 1), "illegal shift count"); 4432 int encode = prefixq_and_encode(dst->encoding()); 4433 emit_byte(0xC1); 4434 emit_byte(0xE8 | encode); 4435 emit_byte(imm8); 4436 } 4437 4438 void Assembler::shrq(Register dst) { 4439 int encode = prefixq_and_encode(dst->encoding()); 4440 emit_byte(0xD3); 4441 emit_byte(0xE8 | encode); 4442 } 4443 4444 void Assembler::subq(Address dst, int32_t imm32) { 4445 InstructionMark im(this); 4446 prefixq(dst); 4447 emit_arith_operand(0x81, rbp, dst, imm32); 4448 } 4449 4450 void Assembler::subq(Address dst, Register src) { 4451 InstructionMark im(this); 4452 prefixq(dst, src); 4453 emit_byte(0x29); 4454 emit_operand(src, dst); 4455 } 4456 4457 void Assembler::subq(Register dst, int32_t imm32) { 4458 (void) prefixq_and_encode(dst->encoding()); 4459 emit_arith(0x81, 0xE8, dst, imm32); 4460 } 4461 4462 void Assembler::subq(Register dst, Address src) { 4463 InstructionMark im(this); 4464 prefixq(src, dst); 4465 emit_byte(0x2B); 4466 emit_operand(dst, src); 4467 } 4468 4469 void Assembler::subq(Register dst, Register src) { 4470 (void) prefixq_and_encode(dst->encoding(), src->encoding()); 4471 emit_arith(0x2B, 0xC0, dst, src); 4472 } 4473 4474 void Assembler::testq(Register dst, int32_t imm32) { 4475 // not using emit_arith because test 4476 // doesn't support sign-extension of 4477 // 8bit operands 4478 int encode = dst->encoding(); 4479 if (encode == 0) { 4480 prefix(REX_W); 4481 emit_byte(0xA9); 4482 } else { 4483 encode = prefixq_and_encode(encode); 4484 emit_byte(0xF7); 4485 emit_byte(0xC0 | encode); 4486 } 4487 emit_long(imm32); 4488 } 4489 4490 void Assembler::testq(Register dst, Register src) { 4491 (void) prefixq_and_encode(dst->encoding(), src->encoding()); 4492 emit_arith(0x85, 0xC0, dst, src); 4493 } 4494 4495 void Assembler::xaddq(Address dst, Register src) { 4496 InstructionMark im(this); 4497 prefixq(dst, src); 4498 emit_byte(0x0F); 4499 emit_byte(0xC1); 4500 emit_operand(src, dst); 4501 } 4502 4503 void Assembler::xchgq(Register dst, Address src) { 4504 InstructionMark im(this); 4505 prefixq(src, dst); 4506 emit_byte(0x87); 4507 emit_operand(dst, src); 4508 } 4509 4510 void Assembler::xchgq(Register dst, Register src) { 4511 int encode = prefixq_and_encode(dst->encoding(), src->encoding()); 4512 emit_byte(0x87); 4513 emit_byte(0xc0 | encode); 4514 } 4515 4516 void Assembler::xorq(Register dst, Register src) { 4517 (void) prefixq_and_encode(dst->encoding(), src->encoding()); 4518 emit_arith(0x33, 0xC0, dst, src); 4519 } 4520 4521 void Assembler::xorq(Register dst, Address src) { 4522 InstructionMark im(this); 4523 prefixq(src, dst); 4524 emit_byte(0x33); 4525 emit_operand(dst, src); 4526 } 4527 4528 #endif // !LP64 4529 4530 static Assembler::Condition reverse[] = { 4531 Assembler::noOverflow /* overflow = 0x0 */ , 4532 Assembler::overflow /* noOverflow = 0x1 */ , 4533 Assembler::aboveEqual /* carrySet = 0x2, below = 0x2 */ , 4534 Assembler::below /* aboveEqual = 0x3, carryClear = 0x3 */ , 4535 Assembler::notZero /* zero = 0x4, equal = 0x4 */ , 4536 Assembler::zero /* notZero = 0x5, notEqual = 0x5 */ , 4537 Assembler::above /* belowEqual = 0x6 */ , 4538 Assembler::belowEqual /* above = 0x7 */ , 4539 Assembler::positive /* negative = 0x8 */ , 4540 Assembler::negative /* positive = 0x9 */ , 4541 Assembler::noParity /* parity = 0xa */ , 4542 Assembler::parity /* noParity = 0xb */ , 4543 Assembler::greaterEqual /* less = 0xc */ , 4544 Assembler::less /* greaterEqual = 0xd */ , 4545 Assembler::greater /* lessEqual = 0xe */ , 4546 Assembler::lessEqual /* greater = 0xf, */ 4547 4548 }; 4549 4550 4551 // Implementation of MacroAssembler 4552 4553 // First all the versions that have distinct versions depending on 32/64 bit 4554 // Unless the difference is trivial (1 line or so). 4555 4556 #ifndef _LP64 4557 4558 // 32bit versions 4559 4560 Address MacroAssembler::as_Address(AddressLiteral adr) { 4561 return Address(adr.target(), adr.rspec()); 4562 } 4563 4564 Address MacroAssembler::as_Address(ArrayAddress adr) { 4565 return Address::make_array(adr); 4566 } 4567 4568 int MacroAssembler::biased_locking_enter(Register lock_reg, 4569 Register obj_reg, 4570 Register swap_reg, 4571 Register tmp_reg, 4572 bool swap_reg_contains_mark, 4573 Label& done, 4574 Label* slow_case, 4575 BiasedLockingCounters* counters) { 4576 assert(UseBiasedLocking, "why call this otherwise?"); 4577 assert(swap_reg == rax, "swap_reg must be rax, for cmpxchg"); 4578 assert_different_registers(lock_reg, obj_reg, swap_reg); 4579 4580 if (PrintBiasedLockingStatistics && counters == NULL) 4581 counters = BiasedLocking::counters(); 4582 4583 bool need_tmp_reg = false; 4584 if (tmp_reg == noreg) { 4585 need_tmp_reg = true; 4586 tmp_reg = lock_reg; 4587 } else { 4588 assert_different_registers(lock_reg, obj_reg, swap_reg, tmp_reg); 4589 } 4590 assert(markOopDesc::age_shift == markOopDesc::lock_bits + markOopDesc::biased_lock_bits, "biased locking makes assumptions about bit layout"); 4591 Address mark_addr (obj_reg, oopDesc::mark_offset_in_bytes()); 4592 Address klass_addr (obj_reg, oopDesc::klass_offset_in_bytes()); 4593 Address saved_mark_addr(lock_reg, 0); 4594 4595 // Biased locking 4596 // See whether the lock is currently biased toward our thread and 4597 // whether the epoch is still valid 4598 // Note that the runtime guarantees sufficient alignment of JavaThread 4599 // pointers to allow age to be placed into low bits 4600 // First check to see whether biasing is even enabled for this object 4601 Label cas_label; 4602 int null_check_offset = -1; 4603 if (!swap_reg_contains_mark) { 4604 null_check_offset = offset(); 4605 movl(swap_reg, mark_addr); 4606 } 4607 if (need_tmp_reg) { 4608 push(tmp_reg); 4609 } 4610 movl(tmp_reg, swap_reg); 4611 andl(tmp_reg, markOopDesc::biased_lock_mask_in_place); 4612 cmpl(tmp_reg, markOopDesc::biased_lock_pattern); 4613 if (need_tmp_reg) { 4614 pop(tmp_reg); 4615 } 4616 jcc(Assembler::notEqual, cas_label); 4617 // The bias pattern is present in the object's header. Need to check 4618 // whether the bias owner and the epoch are both still current. 4619 // Note that because there is no current thread register on x86 we 4620 // need to store off the mark word we read out of the object to 4621 // avoid reloading it and needing to recheck invariants below. This 4622 // store is unfortunate but it makes the overall code shorter and 4623 // simpler. 4624 movl(saved_mark_addr, swap_reg); 4625 if (need_tmp_reg) { 4626 push(tmp_reg); 4627 } 4628 get_thread(tmp_reg); 4629 xorl(swap_reg, tmp_reg); 4630 if (swap_reg_contains_mark) { 4631 null_check_offset = offset(); 4632 } 4633 movl(tmp_reg, klass_addr); 4634 xorl(swap_reg, Address(tmp_reg, Klass::prototype_header_offset_in_bytes() + klassOopDesc::klass_part_offset_in_bytes())); 4635 andl(swap_reg, ~((int) markOopDesc::age_mask_in_place)); 4636 if (need_tmp_reg) { 4637 pop(tmp_reg); 4638 } 4639 if (counters != NULL) { 4640 cond_inc32(Assembler::zero, 4641 ExternalAddress((address)counters->biased_lock_entry_count_addr())); 4642 } 4643 jcc(Assembler::equal, done); 4644 4645 Label try_revoke_bias; 4646 Label try_rebias; 4647 4648 // At this point we know that the header has the bias pattern and 4649 // that we are not the bias owner in the current epoch. We need to 4650 // figure out more details about the state of the header in order to 4651 // know what operations can be legally performed on the object's 4652 // header. 4653 4654 // If the low three bits in the xor result aren't clear, that means 4655 // the prototype header is no longer biased and we have to revoke 4656 // the bias on this object. 4657 testl(swap_reg, markOopDesc::biased_lock_mask_in_place); 4658 jcc(Assembler::notZero, try_revoke_bias); 4659 4660 // Biasing is still enabled for this data type. See whether the 4661 // epoch of the current bias is still valid, meaning that the epoch 4662 // bits of the mark word are equal to the epoch bits of the 4663 // prototype header. (Note that the prototype header's epoch bits 4664 // only change at a safepoint.) If not, attempt to rebias the object 4665 // toward the current thread. Note that we must be absolutely sure 4666 // that the current epoch is invalid in order to do this because 4667 // otherwise the manipulations it performs on the mark word are 4668 // illegal. 4669 testl(swap_reg, markOopDesc::epoch_mask_in_place); 4670 jcc(Assembler::notZero, try_rebias); 4671 4672 // The epoch of the current bias is still valid but we know nothing 4673 // about the owner; it might be set or it might be clear. Try to 4674 // acquire the bias of the object using an atomic operation. If this 4675 // fails we will go in to the runtime to revoke the object's bias. 4676 // Note that we first construct the presumed unbiased header so we 4677 // don't accidentally blow away another thread's valid bias. 4678 movl(swap_reg, saved_mark_addr); 4679 andl(swap_reg, 4680 markOopDesc::biased_lock_mask_in_place | markOopDesc::age_mask_in_place | markOopDesc::epoch_mask_in_place); 4681 if (need_tmp_reg) { 4682 push(tmp_reg); 4683 } 4684 get_thread(tmp_reg); 4685 orl(tmp_reg, swap_reg); 4686 if (os::is_MP()) { 4687 lock(); 4688 } 4689 cmpxchgptr(tmp_reg, Address(obj_reg, 0)); 4690 if (need_tmp_reg) { 4691 pop(tmp_reg); 4692 } 4693 // If the biasing toward our thread failed, this means that 4694 // another thread succeeded in biasing it toward itself and we 4695 // need to revoke that bias. The revocation will occur in the 4696 // interpreter runtime in the slow case. 4697 if (counters != NULL) { 4698 cond_inc32(Assembler::zero, 4699 ExternalAddress((address)counters->anonymously_biased_lock_entry_count_addr())); 4700 } 4701 if (slow_case != NULL) { 4702 jcc(Assembler::notZero, *slow_case); 4703 } 4704 jmp(done); 4705 4706 bind(try_rebias); 4707 // At this point we know the epoch has expired, meaning that the 4708 // current "bias owner", if any, is actually invalid. Under these 4709 // circumstances _only_, we are allowed to use the current header's 4710 // value as the comparison value when doing the cas to acquire the 4711 // bias in the current epoch. In other words, we allow transfer of 4712 // the bias from one thread to another directly in this situation. 4713 // 4714 // FIXME: due to a lack of registers we currently blow away the age 4715 // bits in this situation. Should attempt to preserve them. 4716 if (need_tmp_reg) { 4717 push(tmp_reg); 4718 } 4719 get_thread(tmp_reg); 4720 movl(swap_reg, klass_addr); 4721 orl(tmp_reg, Address(swap_reg, Klass::prototype_header_offset_in_bytes() + klassOopDesc::klass_part_offset_in_bytes())); 4722 movl(swap_reg, saved_mark_addr); 4723 if (os::is_MP()) { 4724 lock(); 4725 } 4726 cmpxchgptr(tmp_reg, Address(obj_reg, 0)); 4727 if (need_tmp_reg) { 4728 pop(tmp_reg); 4729 } 4730 // If the biasing toward our thread failed, then another thread 4731 // succeeded in biasing it toward itself and we need to revoke that 4732 // bias. The revocation will occur in the runtime in the slow case. 4733 if (counters != NULL) { 4734 cond_inc32(Assembler::zero, 4735 ExternalAddress((address)counters->rebiased_lock_entry_count_addr())); 4736 } 4737 if (slow_case != NULL) { 4738 jcc(Assembler::notZero, *slow_case); 4739 } 4740 jmp(done); 4741 4742 bind(try_revoke_bias); 4743 // The prototype mark in the klass doesn't have the bias bit set any 4744 // more, indicating that objects of this data type are not supposed 4745 // to be biased any more. We are going to try to reset the mark of 4746 // this object to the prototype value and fall through to the 4747 // CAS-based locking scheme. Note that if our CAS fails, it means 4748 // that another thread raced us for the privilege of revoking the 4749 // bias of this particular object, so it's okay to continue in the 4750 // normal locking code. 4751 // 4752 // FIXME: due to a lack of registers we currently blow away the age 4753 // bits in this situation. Should attempt to preserve them. 4754 movl(swap_reg, saved_mark_addr); 4755 if (need_tmp_reg) { 4756 push(tmp_reg); 4757 } 4758 movl(tmp_reg, klass_addr); 4759 movl(tmp_reg, Address(tmp_reg, Klass::prototype_header_offset_in_bytes() + klassOopDesc::klass_part_offset_in_bytes())); 4760 if (os::is_MP()) { 4761 lock(); 4762 } 4763 cmpxchgptr(tmp_reg, Address(obj_reg, 0)); 4764 if (need_tmp_reg) { 4765 pop(tmp_reg); 4766 } 4767 // Fall through to the normal CAS-based lock, because no matter what 4768 // the result of the above CAS, some thread must have succeeded in 4769 // removing the bias bit from the object's header. 4770 if (counters != NULL) { 4771 cond_inc32(Assembler::zero, 4772 ExternalAddress((address)counters->revoked_lock_entry_count_addr())); 4773 } 4774 4775 bind(cas_label); 4776 4777 return null_check_offset; 4778 } 4779 void MacroAssembler::call_VM_leaf_base(address entry_point, 4780 int number_of_arguments) { 4781 call(RuntimeAddress(entry_point)); 4782 increment(rsp, number_of_arguments * wordSize); 4783 } 4784 4785 void MacroAssembler::cmpoop(Address src1, jobject obj) { 4786 cmp_literal32(src1, (int32_t)obj, oop_Relocation::spec_for_immediate()); 4787 } 4788 4789 void MacroAssembler::cmpoop(Register src1, jobject obj) { 4790 cmp_literal32(src1, (int32_t)obj, oop_Relocation::spec_for_immediate()); 4791 } 4792 4793 void MacroAssembler::extend_sign(Register hi, Register lo) { 4794 // According to Intel Doc. AP-526, "Integer Divide", p.18. 4795 if (VM_Version::is_P6() && hi == rdx && lo == rax) { 4796 cdql(); 4797 } else { 4798 movl(hi, lo); 4799 sarl(hi, 31); 4800 } 4801 } 4802 4803 void MacroAssembler::fat_nop() { 4804 // A 5 byte nop that is safe for patching (see patch_verified_entry) 4805 emit_byte(0x26); // es: 4806 emit_byte(0x2e); // cs: 4807 emit_byte(0x64); // fs: 4808 emit_byte(0x65); // gs: 4809 emit_byte(0x90); 4810 } 4811 4812 void MacroAssembler::jC2(Register tmp, Label& L) { 4813 // set parity bit if FPU flag C2 is set (via rax) 4814 save_rax(tmp); 4815 fwait(); fnstsw_ax(); 4816 sahf(); 4817 restore_rax(tmp); 4818 // branch 4819 jcc(Assembler::parity, L); 4820 } 4821 4822 void MacroAssembler::jnC2(Register tmp, Label& L) { 4823 // set parity bit if FPU flag C2 is set (via rax) 4824 save_rax(tmp); 4825 fwait(); fnstsw_ax(); 4826 sahf(); 4827 restore_rax(tmp); 4828 // branch 4829 jcc(Assembler::noParity, L); 4830 } 4831 4832 // 32bit can do a case table jump in one instruction but we no longer allow the base 4833 // to be installed in the Address class 4834 void MacroAssembler::jump(ArrayAddress entry) { 4835 jmp(as_Address(entry)); 4836 } 4837 4838 // Note: y_lo will be destroyed 4839 void MacroAssembler::lcmp2int(Register x_hi, Register x_lo, Register y_hi, Register y_lo) { 4840 // Long compare for Java (semantics as described in JVM spec.) 4841 Label high, low, done; 4842 4843 cmpl(x_hi, y_hi); 4844 jcc(Assembler::less, low); 4845 jcc(Assembler::greater, high); 4846 // x_hi is the return register 4847 xorl(x_hi, x_hi); 4848 cmpl(x_lo, y_lo); 4849 jcc(Assembler::below, low); 4850 jcc(Assembler::equal, done); 4851 4852 bind(high); 4853 xorl(x_hi, x_hi); 4854 increment(x_hi); 4855 jmp(done); 4856 4857 bind(low); 4858 xorl(x_hi, x_hi); 4859 decrementl(x_hi); 4860 4861 bind(done); 4862 } 4863 4864 void MacroAssembler::lea(Register dst, AddressLiteral src) { 4865 mov_literal32(dst, (int32_t)src.target(), src.rspec()); 4866 } 4867 4868 void MacroAssembler::lea(Address dst, AddressLiteral adr) { 4869 // leal(dst, as_Address(adr)); 4870 // see note in movl as to why we must use a move 4871 mov_literal32(dst, (int32_t) adr.target(), adr.rspec()); 4872 } 4873 4874 void MacroAssembler::leave() { 4875 mov(rsp, rbp); 4876 pop(rbp); 4877 } 4878 4879 void MacroAssembler::lmul(int x_rsp_offset, int y_rsp_offset) { 4880 // Multiplication of two Java long values stored on the stack 4881 // as illustrated below. Result is in rdx:rax. 4882 // 4883 // rsp ---> [ ?? ] \ \ 4884 // .... | y_rsp_offset | 4885 // [ y_lo ] / (in bytes) | x_rsp_offset 4886 // [ y_hi ] | (in bytes) 4887 // .... | 4888 // [ x_lo ] / 4889 // [ x_hi ] 4890 // .... 4891 // 4892 // Basic idea: lo(result) = lo(x_lo * y_lo) 4893 // hi(result) = hi(x_lo * y_lo) + lo(x_hi * y_lo) + lo(x_lo * y_hi) 4894 Address x_hi(rsp, x_rsp_offset + wordSize); Address x_lo(rsp, x_rsp_offset); 4895 Address y_hi(rsp, y_rsp_offset + wordSize); Address y_lo(rsp, y_rsp_offset); 4896 Label quick; 4897 // load x_hi, y_hi and check if quick 4898 // multiplication is possible 4899 movl(rbx, x_hi); 4900 movl(rcx, y_hi); 4901 movl(rax, rbx); 4902 orl(rbx, rcx); // rbx, = 0 <=> x_hi = 0 and y_hi = 0 4903 jcc(Assembler::zero, quick); // if rbx, = 0 do quick multiply 4904 // do full multiplication 4905 // 1st step 4906 mull(y_lo); // x_hi * y_lo 4907 movl(rbx, rax); // save lo(x_hi * y_lo) in rbx, 4908 // 2nd step 4909 movl(rax, x_lo); 4910 mull(rcx); // x_lo * y_hi 4911 addl(rbx, rax); // add lo(x_lo * y_hi) to rbx, 4912 // 3rd step 4913 bind(quick); // note: rbx, = 0 if quick multiply! 4914 movl(rax, x_lo); 4915 mull(y_lo); // x_lo * y_lo 4916 addl(rdx, rbx); // correct hi(x_lo * y_lo) 4917 } 4918 4919 void MacroAssembler::lneg(Register hi, Register lo) { 4920 negl(lo); 4921 adcl(hi, 0); 4922 negl(hi); 4923 } 4924 4925 void MacroAssembler::lshl(Register hi, Register lo) { 4926 // Java shift left long support (semantics as described in JVM spec., p.305) 4927 // (basic idea for shift counts s >= n: x << s == (x << n) << (s - n)) 4928 // shift value is in rcx ! 4929 assert(hi != rcx, "must not use rcx"); 4930 assert(lo != rcx, "must not use rcx"); 4931 const Register s = rcx; // shift count 4932 const int n = BitsPerWord; 4933 Label L; 4934 andl(s, 0x3f); // s := s & 0x3f (s < 0x40) 4935 cmpl(s, n); // if (s < n) 4936 jcc(Assembler::less, L); // else (s >= n) 4937 movl(hi, lo); // x := x << n 4938 xorl(lo, lo); 4939 // Note: subl(s, n) is not needed since the Intel shift instructions work rcx mod n! 4940 bind(L); // s (mod n) < n 4941 shldl(hi, lo); // x := x << s 4942 shll(lo); 4943 } 4944 4945 4946 void MacroAssembler::lshr(Register hi, Register lo, bool sign_extension) { 4947 // Java shift right long support (semantics as described in JVM spec., p.306 & p.310) 4948 // (basic idea for shift counts s >= n: x >> s == (x >> n) >> (s - n)) 4949 assert(hi != rcx, "must not use rcx"); 4950 assert(lo != rcx, "must not use rcx"); 4951 const Register s = rcx; // shift count 4952 const int n = BitsPerWord; 4953 Label L; 4954 andl(s, 0x3f); // s := s & 0x3f (s < 0x40) 4955 cmpl(s, n); // if (s < n) 4956 jcc(Assembler::less, L); // else (s >= n) 4957 movl(lo, hi); // x := x >> n 4958 if (sign_extension) sarl(hi, 31); 4959 else xorl(hi, hi); 4960 // Note: subl(s, n) is not needed since the Intel shift instructions work rcx mod n! 4961 bind(L); // s (mod n) < n 4962 shrdl(lo, hi); // x := x >> s 4963 if (sign_extension) sarl(hi); 4964 else shrl(hi); 4965 } 4966 4967 void MacroAssembler::movoop(Register dst, jobject obj) { 4968 mov_literal32(dst, (int32_t)obj, oop_Relocation::spec_for_immediate()); 4969 } 4970 4971 void MacroAssembler::movoop(Address dst, jobject obj) { 4972 mov_literal32(dst, (int32_t)obj, oop_Relocation::spec_for_immediate()); 4973 } 4974 4975 void MacroAssembler::movptr(Register dst, AddressLiteral src) { 4976 if (src.is_lval()) { 4977 mov_literal32(dst, (intptr_t)src.target(), src.rspec()); 4978 } else { 4979 movl(dst, as_Address(src)); 4980 } 4981 } 4982 4983 void MacroAssembler::movptr(ArrayAddress dst, Register src) { 4984 movl(as_Address(dst), src); 4985 } 4986 4987 void MacroAssembler::movptr(Register dst, ArrayAddress src) { 4988 movl(dst, as_Address(src)); 4989 } 4990 4991 // src should NEVER be a real pointer. Use AddressLiteral for true pointers 4992 void MacroAssembler::movptr(Address dst, intptr_t src) { 4993 movl(dst, src); 4994 } 4995 4996 4997 void MacroAssembler::pop_callee_saved_registers() { 4998 pop(rcx); 4999 pop(rdx); 5000 pop(rdi); 5001 pop(rsi); 5002 } 5003 5004 void MacroAssembler::pop_fTOS() { 5005 fld_d(Address(rsp, 0)); 5006 addl(rsp, 2 * wordSize); 5007 } 5008 5009 void MacroAssembler::push_callee_saved_registers() { 5010 push(rsi); 5011 push(rdi); 5012 push(rdx); 5013 push(rcx); 5014 } 5015 5016 void MacroAssembler::push_fTOS() { 5017 subl(rsp, 2 * wordSize); 5018 fstp_d(Address(rsp, 0)); 5019 } 5020 5021 5022 void MacroAssembler::pushoop(jobject obj) { 5023 push_literal32((int32_t)obj, oop_Relocation::spec_for_immediate()); 5024 } 5025 5026 5027 void MacroAssembler::pushptr(AddressLiteral src) { 5028 if (src.is_lval()) { 5029 push_literal32((int32_t)src.target(), src.rspec()); 5030 } else { 5031 pushl(as_Address(src)); 5032 } 5033 } 5034 5035 void MacroAssembler::set_word_if_not_zero(Register dst) { 5036 xorl(dst, dst); 5037 set_byte_if_not_zero(dst); 5038 } 5039 5040 static void pass_arg0(MacroAssembler* masm, Register arg) { 5041 masm->push(arg); 5042 } 5043 5044 static void pass_arg1(MacroAssembler* masm, Register arg) { 5045 masm->push(arg); 5046 } 5047 5048 static void pass_arg2(MacroAssembler* masm, Register arg) { 5049 masm->push(arg); 5050 } 5051 5052 static void pass_arg3(MacroAssembler* masm, Register arg) { 5053 masm->push(arg); 5054 } 5055 5056 #ifndef PRODUCT 5057 extern "C" void findpc(intptr_t x); 5058 #endif 5059 5060 void MacroAssembler::debug32(int rdi, int rsi, int rbp, int rsp, int rbx, int rdx, int rcx, int rax, int eip, char* msg) { 5061 // In order to get locks to work, we need to fake a in_VM state 5062 JavaThread* thread = JavaThread::current(); 5063 JavaThreadState saved_state = thread->thread_state(); 5064 thread->set_thread_state(_thread_in_vm); 5065 if (ShowMessageBoxOnError) { 5066 JavaThread* thread = JavaThread::current(); 5067 JavaThreadState saved_state = thread->thread_state(); 5068 thread->set_thread_state(_thread_in_vm); 5069 if (CountBytecodes || TraceBytecodes || StopInterpreterAt) { 5070 ttyLocker ttyl; 5071 BytecodeCounter::print(); 5072 } 5073 // To see where a verify_oop failed, get $ebx+40/X for this frame. 5074 // This is the value of eip which points to where verify_oop will return. 5075 if (os::message_box(msg, "Execution stopped, print registers?")) { 5076 ttyLocker ttyl; 5077 tty->print_cr("eip = 0x%08x", eip); 5078 #ifndef PRODUCT 5079 if ((WizardMode || Verbose) && PrintMiscellaneous) { 5080 tty->cr(); 5081 findpc(eip); 5082 tty->cr(); 5083 } 5084 #endif 5085 tty->print_cr("rax = 0x%08x", rax); 5086 tty->print_cr("rbx = 0x%08x", rbx); 5087 tty->print_cr("rcx = 0x%08x", rcx); 5088 tty->print_cr("rdx = 0x%08x", rdx); 5089 tty->print_cr("rdi = 0x%08x", rdi); 5090 tty->print_cr("rsi = 0x%08x", rsi); 5091 tty->print_cr("rbp = 0x%08x", rbp); 5092 tty->print_cr("rsp = 0x%08x", rsp); 5093 BREAKPOINT; 5094 assert(false, "start up GDB"); 5095 } 5096 } else { 5097 ttyLocker ttyl; 5098 ::tty->print_cr("=============== DEBUG MESSAGE: %s ================\n", msg); 5099 assert(false, err_msg("DEBUG MESSAGE: %s", msg)); 5100 } 5101 ThreadStateTransition::transition(thread, _thread_in_vm, saved_state); 5102 } 5103 5104 void MacroAssembler::stop(const char* msg) { 5105 ExternalAddress message((address)msg); 5106 // push address of message 5107 pushptr(message.addr()); 5108 { Label L; call(L, relocInfo::none); bind(L); } // push eip 5109 pusha(); // push registers 5110 call(RuntimeAddress(CAST_FROM_FN_PTR(address, MacroAssembler::debug32))); 5111 hlt(); 5112 } 5113 5114 void MacroAssembler::warn(const char* msg) { 5115 push_CPU_state(); 5116 5117 ExternalAddress message((address) msg); 5118 // push address of message 5119 pushptr(message.addr()); 5120 5121 call(RuntimeAddress(CAST_FROM_FN_PTR(address, warning))); 5122 addl(rsp, wordSize); // discard argument 5123 pop_CPU_state(); 5124 } 5125 5126 #else // _LP64 5127 5128 // 64 bit versions 5129 5130 Address MacroAssembler::as_Address(AddressLiteral adr) { 5131 // amd64 always does this as a pc-rel 5132 // we can be absolute or disp based on the instruction type 5133 // jmp/call are displacements others are absolute 5134 assert(!adr.is_lval(), "must be rval"); 5135 assert(reachable(adr), "must be"); 5136 return Address((int32_t)(intptr_t)(adr.target() - pc()), adr.target(), adr.reloc()); 5137 5138 } 5139 5140 Address MacroAssembler::as_Address(ArrayAddress adr) { 5141 AddressLiteral base = adr.base(); 5142 lea(rscratch1, base); 5143 Address index = adr.index(); 5144 assert(index._disp == 0, "must not have disp"); // maybe it can? 5145 Address array(rscratch1, index._index, index._scale, index._disp); 5146 return array; 5147 } 5148 5149 int MacroAssembler::biased_locking_enter(Register lock_reg, 5150 Register obj_reg, 5151 Register swap_reg, 5152 Register tmp_reg, 5153 bool swap_reg_contains_mark, 5154 Label& done, 5155 Label* slow_case, 5156 BiasedLockingCounters* counters) { 5157 assert(UseBiasedLocking, "why call this otherwise?"); 5158 assert(swap_reg == rax, "swap_reg must be rax for cmpxchgq"); 5159 assert(tmp_reg != noreg, "tmp_reg must be supplied"); 5160 assert_different_registers(lock_reg, obj_reg, swap_reg, tmp_reg); 5161 assert(markOopDesc::age_shift == markOopDesc::lock_bits + markOopDesc::biased_lock_bits, "biased locking makes assumptions about bit layout"); 5162 Address mark_addr (obj_reg, oopDesc::mark_offset_in_bytes()); 5163 Address saved_mark_addr(lock_reg, 0); 5164 5165 if (PrintBiasedLockingStatistics && counters == NULL) 5166 counters = BiasedLocking::counters(); 5167 5168 // Biased locking 5169 // See whether the lock is currently biased toward our thread and 5170 // whether the epoch is still valid 5171 // Note that the runtime guarantees sufficient alignment of JavaThread 5172 // pointers to allow age to be placed into low bits 5173 // First check to see whether biasing is even enabled for this object 5174 Label cas_label; 5175 int null_check_offset = -1; 5176 if (!swap_reg_contains_mark) { 5177 null_check_offset = offset(); 5178 movq(swap_reg, mark_addr); 5179 } 5180 movq(tmp_reg, swap_reg); 5181 andq(tmp_reg, markOopDesc::biased_lock_mask_in_place); 5182 cmpq(tmp_reg, markOopDesc::biased_lock_pattern); 5183 jcc(Assembler::notEqual, cas_label); 5184 // The bias pattern is present in the object's header. Need to check 5185 // whether the bias owner and the epoch are both still current. 5186 load_prototype_header(tmp_reg, obj_reg); 5187 orq(tmp_reg, r15_thread); 5188 xorq(tmp_reg, swap_reg); 5189 andq(tmp_reg, ~((int) markOopDesc::age_mask_in_place)); 5190 if (counters != NULL) { 5191 cond_inc32(Assembler::zero, 5192 ExternalAddress((address) counters->anonymously_biased_lock_entry_count_addr())); 5193 } 5194 jcc(Assembler::equal, done); 5195 5196 Label try_revoke_bias; 5197 Label try_rebias; 5198 5199 // At this point we know that the header has the bias pattern and 5200 // that we are not the bias owner in the current epoch. We need to 5201 // figure out more details about the state of the header in order to 5202 // know what operations can be legally performed on the object's 5203 // header. 5204 5205 // If the low three bits in the xor result aren't clear, that means 5206 // the prototype header is no longer biased and we have to revoke 5207 // the bias on this object. 5208 testq(tmp_reg, markOopDesc::biased_lock_mask_in_place); 5209 jcc(Assembler::notZero, try_revoke_bias); 5210 5211 // Biasing is still enabled for this data type. See whether the 5212 // epoch of the current bias is still valid, meaning that the epoch 5213 // bits of the mark word are equal to the epoch bits of the 5214 // prototype header. (Note that the prototype header's epoch bits 5215 // only change at a safepoint.) If not, attempt to rebias the object 5216 // toward the current thread. Note that we must be absolutely sure 5217 // that the current epoch is invalid in order to do this because 5218 // otherwise the manipulations it performs on the mark word are 5219 // illegal. 5220 testq(tmp_reg, markOopDesc::epoch_mask_in_place); 5221 jcc(Assembler::notZero, try_rebias); 5222 5223 // The epoch of the current bias is still valid but we know nothing 5224 // about the owner; it might be set or it might be clear. Try to 5225 // acquire the bias of the object using an atomic operation. If this 5226 // fails we will go in to the runtime to revoke the object's bias. 5227 // Note that we first construct the presumed unbiased header so we 5228 // don't accidentally blow away another thread's valid bias. 5229 andq(swap_reg, 5230 markOopDesc::biased_lock_mask_in_place | markOopDesc::age_mask_in_place | markOopDesc::epoch_mask_in_place); 5231 movq(tmp_reg, swap_reg); 5232 orq(tmp_reg, r15_thread); 5233 if (os::is_MP()) { 5234 lock(); 5235 } 5236 cmpxchgq(tmp_reg, Address(obj_reg, 0)); 5237 // If the biasing toward our thread failed, this means that 5238 // another thread succeeded in biasing it toward itself and we 5239 // need to revoke that bias. The revocation will occur in the 5240 // interpreter runtime in the slow case. 5241 if (counters != NULL) { 5242 cond_inc32(Assembler::zero, 5243 ExternalAddress((address) counters->anonymously_biased_lock_entry_count_addr())); 5244 } 5245 if (slow_case != NULL) { 5246 jcc(Assembler::notZero, *slow_case); 5247 } 5248 jmp(done); 5249 5250 bind(try_rebias); 5251 // At this point we know the epoch has expired, meaning that the 5252 // current "bias owner", if any, is actually invalid. Under these 5253 // circumstances _only_, we are allowed to use the current header's 5254 // value as the comparison value when doing the cas to acquire the 5255 // bias in the current epoch. In other words, we allow transfer of 5256 // the bias from one thread to another directly in this situation. 5257 // 5258 // FIXME: due to a lack of registers we currently blow away the age 5259 // bits in this situation. Should attempt to preserve them. 5260 load_prototype_header(tmp_reg, obj_reg); 5261 orq(tmp_reg, r15_thread); 5262 if (os::is_MP()) { 5263 lock(); 5264 } 5265 cmpxchgq(tmp_reg, Address(obj_reg, 0)); 5266 // If the biasing toward our thread failed, then another thread 5267 // succeeded in biasing it toward itself and we need to revoke that 5268 // bias. The revocation will occur in the runtime in the slow case. 5269 if (counters != NULL) { 5270 cond_inc32(Assembler::zero, 5271 ExternalAddress((address) counters->rebiased_lock_entry_count_addr())); 5272 } 5273 if (slow_case != NULL) { 5274 jcc(Assembler::notZero, *slow_case); 5275 } 5276 jmp(done); 5277 5278 bind(try_revoke_bias); 5279 // The prototype mark in the klass doesn't have the bias bit set any 5280 // more, indicating that objects of this data type are not supposed 5281 // to be biased any more. We are going to try to reset the mark of 5282 // this object to the prototype value and fall through to the 5283 // CAS-based locking scheme. Note that if our CAS fails, it means 5284 // that another thread raced us for the privilege of revoking the 5285 // bias of this particular object, so it's okay to continue in the 5286 // normal locking code. 5287 // 5288 // FIXME: due to a lack of registers we currently blow away the age 5289 // bits in this situation. Should attempt to preserve them. 5290 load_prototype_header(tmp_reg, obj_reg); 5291 if (os::is_MP()) { 5292 lock(); 5293 } 5294 cmpxchgq(tmp_reg, Address(obj_reg, 0)); 5295 // Fall through to the normal CAS-based lock, because no matter what 5296 // the result of the above CAS, some thread must have succeeded in 5297 // removing the bias bit from the object's header. 5298 if (counters != NULL) { 5299 cond_inc32(Assembler::zero, 5300 ExternalAddress((address) counters->revoked_lock_entry_count_addr())); 5301 } 5302 5303 bind(cas_label); 5304 5305 return null_check_offset; 5306 } 5307 5308 void MacroAssembler::call_VM_leaf_base(address entry_point, int num_args) { 5309 Label L, E; 5310 5311 #ifdef _WIN64 5312 // Windows always allocates space for it's register args 5313 assert(num_args <= 4, "only register arguments supported"); 5314 subq(rsp, frame::arg_reg_save_area_bytes); 5315 #endif 5316 5317 // Align stack if necessary 5318 testl(rsp, 15); 5319 jcc(Assembler::zero, L); 5320 5321 subq(rsp, 8); 5322 { 5323 call(RuntimeAddress(entry_point)); 5324 } 5325 addq(rsp, 8); 5326 jmp(E); 5327 5328 bind(L); 5329 { 5330 call(RuntimeAddress(entry_point)); 5331 } 5332 5333 bind(E); 5334 5335 #ifdef _WIN64 5336 // restore stack pointer 5337 addq(rsp, frame::arg_reg_save_area_bytes); 5338 #endif 5339 5340 } 5341 5342 void MacroAssembler::cmp64(Register src1, AddressLiteral src2) { 5343 assert(!src2.is_lval(), "should use cmpptr"); 5344 5345 if (reachable(src2)) { 5346 cmpq(src1, as_Address(src2)); 5347 } else { 5348 lea(rscratch1, src2); 5349 Assembler::cmpq(src1, Address(rscratch1, 0)); 5350 } 5351 } 5352 5353 int MacroAssembler::corrected_idivq(Register reg) { 5354 // Full implementation of Java ldiv and lrem; checks for special 5355 // case as described in JVM spec., p.243 & p.271. The function 5356 // returns the (pc) offset of the idivl instruction - may be needed 5357 // for implicit exceptions. 5358 // 5359 // normal case special case 5360 // 5361 // input : rax: dividend min_long 5362 // reg: divisor (may not be eax/edx) -1 5363 // 5364 // output: rax: quotient (= rax idiv reg) min_long 5365 // rdx: remainder (= rax irem reg) 0 5366 assert(reg != rax && reg != rdx, "reg cannot be rax or rdx register"); 5367 static const int64_t min_long = 0x8000000000000000; 5368 Label normal_case, special_case; 5369 5370 // check for special case 5371 cmp64(rax, ExternalAddress((address) &min_long)); 5372 jcc(Assembler::notEqual, normal_case); 5373 xorl(rdx, rdx); // prepare rdx for possible special case (where 5374 // remainder = 0) 5375 cmpq(reg, -1); 5376 jcc(Assembler::equal, special_case); 5377 5378 // handle normal case 5379 bind(normal_case); 5380 cdqq(); 5381 int idivq_offset = offset(); 5382 idivq(reg); 5383 5384 // normal and special case exit 5385 bind(special_case); 5386 5387 return idivq_offset; 5388 } 5389 5390 void MacroAssembler::decrementq(Register reg, int value) { 5391 if (value == min_jint) { subq(reg, value); return; } 5392 if (value < 0) { incrementq(reg, -value); return; } 5393 if (value == 0) { ; return; } 5394 if (value == 1 && UseIncDec) { decq(reg) ; return; } 5395 /* else */ { subq(reg, value) ; return; } 5396 } 5397 5398 void MacroAssembler::decrementq(Address dst, int value) { 5399 if (value == min_jint) { subq(dst, value); return; } 5400 if (value < 0) { incrementq(dst, -value); return; } 5401 if (value == 0) { ; return; } 5402 if (value == 1 && UseIncDec) { decq(dst) ; return; } 5403 /* else */ { subq(dst, value) ; return; } 5404 } 5405 5406 void MacroAssembler::fat_nop() { 5407 // A 5 byte nop that is safe for patching (see patch_verified_entry) 5408 // Recommened sequence from 'Software Optimization Guide for the AMD 5409 // Hammer Processor' 5410 emit_byte(0x66); 5411 emit_byte(0x66); 5412 emit_byte(0x90); 5413 emit_byte(0x66); 5414 emit_byte(0x90); 5415 } 5416 5417 void MacroAssembler::incrementq(Register reg, int value) { 5418 if (value == min_jint) { addq(reg, value); return; } 5419 if (value < 0) { decrementq(reg, -value); return; } 5420 if (value == 0) { ; return; } 5421 if (value == 1 && UseIncDec) { incq(reg) ; return; } 5422 /* else */ { addq(reg, value) ; return; } 5423 } 5424 5425 void MacroAssembler::incrementq(Address dst, int value) { 5426 if (value == min_jint) { addq(dst, value); return; } 5427 if (value < 0) { decrementq(dst, -value); return; } 5428 if (value == 0) { ; return; } 5429 if (value == 1 && UseIncDec) { incq(dst) ; return; } 5430 /* else */ { addq(dst, value) ; return; } 5431 } 5432 5433 // 32bit can do a case table jump in one instruction but we no longer allow the base 5434 // to be installed in the Address class 5435 void MacroAssembler::jump(ArrayAddress entry) { 5436 lea(rscratch1, entry.base()); 5437 Address dispatch = entry.index(); 5438 assert(dispatch._base == noreg, "must be"); 5439 dispatch._base = rscratch1; 5440 jmp(dispatch); 5441 } 5442 5443 void MacroAssembler::lcmp2int(Register x_hi, Register x_lo, Register y_hi, Register y_lo) { 5444 ShouldNotReachHere(); // 64bit doesn't use two regs 5445 cmpq(x_lo, y_lo); 5446 } 5447 5448 void MacroAssembler::lea(Register dst, AddressLiteral src) { 5449 mov_literal64(dst, (intptr_t)src.target(), src.rspec()); 5450 } 5451 5452 void MacroAssembler::lea(Address dst, AddressLiteral adr) { 5453 mov_literal64(rscratch1, (intptr_t)adr.target(), adr.rspec()); 5454 movptr(dst, rscratch1); 5455 } 5456 5457 void MacroAssembler::leave() { 5458 // %%% is this really better? Why not on 32bit too? 5459 emit_byte(0xC9); // LEAVE 5460 } 5461 5462 void MacroAssembler::lneg(Register hi, Register lo) { 5463 ShouldNotReachHere(); // 64bit doesn't use two regs 5464 negq(lo); 5465 } 5466 5467 void MacroAssembler::movoop(Register dst, jobject obj) { 5468 mov_literal64(dst, (intptr_t)obj, oop_Relocation::spec_for_immediate()); 5469 } 5470 5471 void MacroAssembler::movoop(Address dst, jobject obj) { 5472 mov_literal64(rscratch1, (intptr_t)obj, oop_Relocation::spec_for_immediate()); 5473 movq(dst, rscratch1); 5474 } 5475 5476 void MacroAssembler::movptr(Register dst, AddressLiteral src) { 5477 if (src.is_lval()) { 5478 mov_literal64(dst, (intptr_t)src.target(), src.rspec()); 5479 } else { 5480 if (reachable(src)) { 5481 movq(dst, as_Address(src)); 5482 } else { 5483 lea(rscratch1, src); 5484 movq(dst, Address(rscratch1,0)); 5485 } 5486 } 5487 } 5488 5489 void MacroAssembler::movptr(ArrayAddress dst, Register src) { 5490 movq(as_Address(dst), src); 5491 } 5492 5493 void MacroAssembler::movptr(Register dst, ArrayAddress src) { 5494 movq(dst, as_Address(src)); 5495 } 5496 5497 // src should NEVER be a real pointer. Use AddressLiteral for true pointers 5498 void MacroAssembler::movptr(Address dst, intptr_t src) { 5499 mov64(rscratch1, src); 5500 movq(dst, rscratch1); 5501 } 5502 5503 // These are mostly for initializing NULL 5504 void MacroAssembler::movptr(Address dst, int32_t src) { 5505 movslq(dst, src); 5506 } 5507 5508 void MacroAssembler::movptr(Register dst, int32_t src) { 5509 mov64(dst, (intptr_t)src); 5510 } 5511 5512 void MacroAssembler::pushoop(jobject obj) { 5513 movoop(rscratch1, obj); 5514 push(rscratch1); 5515 } 5516 5517 void MacroAssembler::pushptr(AddressLiteral src) { 5518 lea(rscratch1, src); 5519 if (src.is_lval()) { 5520 push(rscratch1); 5521 } else { 5522 pushq(Address(rscratch1, 0)); 5523 } 5524 } 5525 5526 void MacroAssembler::reset_last_Java_frame(bool clear_fp, 5527 bool clear_pc) { 5528 // we must set sp to zero to clear frame 5529 movptr(Address(r15_thread, JavaThread::last_Java_sp_offset()), NULL_WORD); 5530 // must clear fp, so that compiled frames are not confused; it is 5531 // possible that we need it only for debugging 5532 if (clear_fp) { 5533 movptr(Address(r15_thread, JavaThread::last_Java_fp_offset()), NULL_WORD); 5534 } 5535 5536 if (clear_pc) { 5537 movptr(Address(r15_thread, JavaThread::last_Java_pc_offset()), NULL_WORD); 5538 } 5539 } 5540 5541 void MacroAssembler::set_last_Java_frame(Register last_java_sp, 5542 Register last_java_fp, 5543 address last_java_pc) { 5544 // determine last_java_sp register 5545 if (!last_java_sp->is_valid()) { 5546 last_java_sp = rsp; 5547 } 5548 5549 // last_java_fp is optional 5550 if (last_java_fp->is_valid()) { 5551 movptr(Address(r15_thread, JavaThread::last_Java_fp_offset()), 5552 last_java_fp); 5553 } 5554 5555 // last_java_pc is optional 5556 if (last_java_pc != NULL) { 5557 Address java_pc(r15_thread, 5558 JavaThread::frame_anchor_offset() + JavaFrameAnchor::last_Java_pc_offset()); 5559 lea(rscratch1, InternalAddress(last_java_pc)); 5560 movptr(java_pc, rscratch1); 5561 } 5562 5563 movptr(Address(r15_thread, JavaThread::last_Java_sp_offset()), last_java_sp); 5564 } 5565 5566 static void pass_arg0(MacroAssembler* masm, Register arg) { 5567 if (c_rarg0 != arg ) { 5568 masm->mov(c_rarg0, arg); 5569 } 5570 } 5571 5572 static void pass_arg1(MacroAssembler* masm, Register arg) { 5573 if (c_rarg1 != arg ) { 5574 masm->mov(c_rarg1, arg); 5575 } 5576 } 5577 5578 static void pass_arg2(MacroAssembler* masm, Register arg) { 5579 if (c_rarg2 != arg ) { 5580 masm->mov(c_rarg2, arg); 5581 } 5582 } 5583 5584 static void pass_arg3(MacroAssembler* masm, Register arg) { 5585 if (c_rarg3 != arg ) { 5586 masm->mov(c_rarg3, arg); 5587 } 5588 } 5589 5590 void MacroAssembler::stop(const char* msg) { 5591 address rip = pc(); 5592 pusha(); // get regs on stack 5593 lea(c_rarg0, ExternalAddress((address) msg)); 5594 lea(c_rarg1, InternalAddress(rip)); 5595 movq(c_rarg2, rsp); // pass pointer to regs array 5596 andq(rsp, -16); // align stack as required by ABI 5597 call(RuntimeAddress(CAST_FROM_FN_PTR(address, MacroAssembler::debug64))); 5598 hlt(); 5599 } 5600 5601 void MacroAssembler::warn(const char* msg) { 5602 push(rsp); 5603 andq(rsp, -16); // align stack as required by push_CPU_state and call 5604 5605 push_CPU_state(); // keeps alignment at 16 bytes 5606 lea(c_rarg0, ExternalAddress((address) msg)); 5607 call_VM_leaf(CAST_FROM_FN_PTR(address, warning), c_rarg0); 5608 pop_CPU_state(); 5609 pop(rsp); 5610 } 5611 5612 #ifndef PRODUCT 5613 extern "C" void findpc(intptr_t x); 5614 #endif 5615 5616 void MacroAssembler::debug64(char* msg, int64_t pc, int64_t regs[]) { 5617 // In order to get locks to work, we need to fake a in_VM state 5618 if (ShowMessageBoxOnError ) { 5619 JavaThread* thread = JavaThread::current(); 5620 JavaThreadState saved_state = thread->thread_state(); 5621 thread->set_thread_state(_thread_in_vm); 5622 #ifndef PRODUCT 5623 if (CountBytecodes || TraceBytecodes || StopInterpreterAt) { 5624 ttyLocker ttyl; 5625 BytecodeCounter::print(); 5626 } 5627 #endif 5628 // To see where a verify_oop failed, get $ebx+40/X for this frame. 5629 // XXX correct this offset for amd64 5630 // This is the value of eip which points to where verify_oop will return. 5631 if (os::message_box(msg, "Execution stopped, print registers?")) { 5632 ttyLocker ttyl; 5633 tty->print_cr("rip = 0x%016lx", pc); 5634 #ifndef PRODUCT 5635 tty->cr(); 5636 findpc(pc); 5637 tty->cr(); 5638 #endif 5639 tty->print_cr("rax = 0x%016lx", regs[15]); 5640 tty->print_cr("rbx = 0x%016lx", regs[12]); 5641 tty->print_cr("rcx = 0x%016lx", regs[14]); 5642 tty->print_cr("rdx = 0x%016lx", regs[13]); 5643 tty->print_cr("rdi = 0x%016lx", regs[8]); 5644 tty->print_cr("rsi = 0x%016lx", regs[9]); 5645 tty->print_cr("rbp = 0x%016lx", regs[10]); 5646 tty->print_cr("rsp = 0x%016lx", regs[11]); 5647 tty->print_cr("r8 = 0x%016lx", regs[7]); 5648 tty->print_cr("r9 = 0x%016lx", regs[6]); 5649 tty->print_cr("r10 = 0x%016lx", regs[5]); 5650 tty->print_cr("r11 = 0x%016lx", regs[4]); 5651 tty->print_cr("r12 = 0x%016lx", regs[3]); 5652 tty->print_cr("r13 = 0x%016lx", regs[2]); 5653 tty->print_cr("r14 = 0x%016lx", regs[1]); 5654 tty->print_cr("r15 = 0x%016lx", regs[0]); 5655 BREAKPOINT; 5656 } 5657 ThreadStateTransition::transition(thread, _thread_in_vm, saved_state); 5658 } else { 5659 ttyLocker ttyl; 5660 ::tty->print_cr("=============== DEBUG MESSAGE: %s ================\n", 5661 msg); 5662 assert(false, err_msg("DEBUG MESSAGE: %s", msg)); 5663 } 5664 } 5665 5666 #endif // _LP64 5667 5668 // Now versions that are common to 32/64 bit 5669 5670 void MacroAssembler::addptr(Register dst, int32_t imm32) { 5671 LP64_ONLY(addq(dst, imm32)) NOT_LP64(addl(dst, imm32)); 5672 } 5673 5674 void MacroAssembler::addptr(Register dst, Register src) { 5675 LP64_ONLY(addq(dst, src)) NOT_LP64(addl(dst, src)); 5676 } 5677 5678 void MacroAssembler::addptr(Address dst, Register src) { 5679 LP64_ONLY(addq(dst, src)) NOT_LP64(addl(dst, src)); 5680 } 5681 5682 void MacroAssembler::align(int modulus) { 5683 if (offset() % modulus != 0) { 5684 nop(modulus - (offset() % modulus)); 5685 } 5686 } 5687 5688 void MacroAssembler::andpd(XMMRegister dst, AddressLiteral src) { 5689 if (reachable(src)) { 5690 andpd(dst, as_Address(src)); 5691 } else { 5692 lea(rscratch1, src); 5693 andpd(dst, Address(rscratch1, 0)); 5694 } 5695 } 5696 5697 void MacroAssembler::andptr(Register dst, int32_t imm32) { 5698 LP64_ONLY(andq(dst, imm32)) NOT_LP64(andl(dst, imm32)); 5699 } 5700 5701 void MacroAssembler::atomic_incl(AddressLiteral counter_addr) { 5702 pushf(); 5703 if (os::is_MP()) 5704 lock(); 5705 incrementl(counter_addr); 5706 popf(); 5707 } 5708 5709 // Writes to stack successive pages until offset reached to check for 5710 // stack overflow + shadow pages. This clobbers tmp. 5711 void MacroAssembler::bang_stack_size(Register size, Register tmp) { 5712 movptr(tmp, rsp); 5713 // Bang stack for total size given plus shadow page size. 5714 // Bang one page at a time because large size can bang beyond yellow and 5715 // red zones. 5716 Label loop; 5717 bind(loop); 5718 movl(Address(tmp, (-os::vm_page_size())), size ); 5719 subptr(tmp, os::vm_page_size()); 5720 subl(size, os::vm_page_size()); 5721 jcc(Assembler::greater, loop); 5722 5723 // Bang down shadow pages too. 5724 // The -1 because we already subtracted 1 page. 5725 for (int i = 0; i< StackShadowPages-1; i++) { 5726 // this could be any sized move but this is can be a debugging crumb 5727 // so the bigger the better. 5728 movptr(Address(tmp, (-i*os::vm_page_size())), size ); 5729 } 5730 } 5731 5732 void MacroAssembler::biased_locking_exit(Register obj_reg, Register temp_reg, Label& done) { 5733 assert(UseBiasedLocking, "why call this otherwise?"); 5734 5735 // Check for biased locking unlock case, which is a no-op 5736 // Note: we do not have to check the thread ID for two reasons. 5737 // First, the interpreter checks for IllegalMonitorStateException at 5738 // a higher level. Second, if the bias was revoked while we held the 5739 // lock, the object could not be rebiased toward another thread, so 5740 // the bias bit would be clear. 5741 movptr(temp_reg, Address(obj_reg, oopDesc::mark_offset_in_bytes())); 5742 andptr(temp_reg, markOopDesc::biased_lock_mask_in_place); 5743 cmpptr(temp_reg, markOopDesc::biased_lock_pattern); 5744 jcc(Assembler::equal, done); 5745 } 5746 5747 void MacroAssembler::c2bool(Register x) { 5748 // implements x == 0 ? 0 : 1 5749 // note: must only look at least-significant byte of x 5750 // since C-style booleans are stored in one byte 5751 // only! (was bug) 5752 andl(x, 0xFF); 5753 setb(Assembler::notZero, x); 5754 } 5755 5756 // Wouldn't need if AddressLiteral version had new name 5757 void MacroAssembler::call(Label& L, relocInfo::relocType rtype) { 5758 Assembler::call(L, rtype); 5759 } 5760 5761 void MacroAssembler::call(Register entry) { 5762 Assembler::call(entry); 5763 } 5764 5765 void MacroAssembler::call(AddressLiteral entry) { 5766 if (reachable(entry)) { 5767 Assembler::call_literal(entry.target(), entry.rspec()); 5768 } else { 5769 lea(rscratch1, entry); 5770 Assembler::call(rscratch1); 5771 } 5772 } 5773 5774 // Implementation of call_VM versions 5775 5776 void MacroAssembler::call_VM(Register oop_result, 5777 address entry_point, 5778 bool check_exceptions) { 5779 Label C, E; 5780 call(C, relocInfo::none); 5781 jmp(E); 5782 5783 bind(C); 5784 call_VM_helper(oop_result, entry_point, 0, check_exceptions); 5785 ret(0); 5786 5787 bind(E); 5788 } 5789 5790 void MacroAssembler::call_VM(Register oop_result, 5791 address entry_point, 5792 Register arg_1, 5793 bool check_exceptions) { 5794 Label C, E; 5795 call(C, relocInfo::none); 5796 jmp(E); 5797 5798 bind(C); 5799 pass_arg1(this, arg_1); 5800 call_VM_helper(oop_result, entry_point, 1, check_exceptions); 5801 ret(0); 5802 5803 bind(E); 5804 } 5805 5806 void MacroAssembler::call_VM(Register oop_result, 5807 address entry_point, 5808 Register arg_1, 5809 Register arg_2, 5810 bool check_exceptions) { 5811 Label C, E; 5812 call(C, relocInfo::none); 5813 jmp(E); 5814 5815 bind(C); 5816 5817 LP64_ONLY(assert(arg_1 != c_rarg2, "smashed arg")); 5818 5819 pass_arg2(this, arg_2); 5820 pass_arg1(this, arg_1); 5821 call_VM_helper(oop_result, entry_point, 2, check_exceptions); 5822 ret(0); 5823 5824 bind(E); 5825 } 5826 5827 void MacroAssembler::call_VM(Register oop_result, 5828 address entry_point, 5829 Register arg_1, 5830 Register arg_2, 5831 Register arg_3, 5832 bool check_exceptions) { 5833 Label C, E; 5834 call(C, relocInfo::none); 5835 jmp(E); 5836 5837 bind(C); 5838 5839 LP64_ONLY(assert(arg_1 != c_rarg3, "smashed arg")); 5840 LP64_ONLY(assert(arg_2 != c_rarg3, "smashed arg")); 5841 pass_arg3(this, arg_3); 5842 5843 LP64_ONLY(assert(arg_1 != c_rarg2, "smashed arg")); 5844 pass_arg2(this, arg_2); 5845 5846 pass_arg1(this, arg_1); 5847 call_VM_helper(oop_result, entry_point, 3, check_exceptions); 5848 ret(0); 5849 5850 bind(E); 5851 } 5852 5853 void MacroAssembler::call_VM(Register oop_result, 5854 Register last_java_sp, 5855 address entry_point, 5856 int number_of_arguments, 5857 bool check_exceptions) { 5858 Register thread = LP64_ONLY(r15_thread) NOT_LP64(noreg); 5859 call_VM_base(oop_result, thread, last_java_sp, entry_point, number_of_arguments, check_exceptions); 5860 } 5861 5862 void MacroAssembler::call_VM(Register oop_result, 5863 Register last_java_sp, 5864 address entry_point, 5865 Register arg_1, 5866 bool check_exceptions) { 5867 pass_arg1(this, arg_1); 5868 call_VM(oop_result, last_java_sp, entry_point, 1, check_exceptions); 5869 } 5870 5871 void MacroAssembler::call_VM(Register oop_result, 5872 Register last_java_sp, 5873 address entry_point, 5874 Register arg_1, 5875 Register arg_2, 5876 bool check_exceptions) { 5877 5878 LP64_ONLY(assert(arg_1 != c_rarg2, "smashed arg")); 5879 pass_arg2(this, arg_2); 5880 pass_arg1(this, arg_1); 5881 call_VM(oop_result, last_java_sp, entry_point, 2, check_exceptions); 5882 } 5883 5884 void MacroAssembler::call_VM(Register oop_result, 5885 Register last_java_sp, 5886 address entry_point, 5887 Register arg_1, 5888 Register arg_2, 5889 Register arg_3, 5890 bool check_exceptions) { 5891 LP64_ONLY(assert(arg_1 != c_rarg3, "smashed arg")); 5892 LP64_ONLY(assert(arg_2 != c_rarg3, "smashed arg")); 5893 pass_arg3(this, arg_3); 5894 LP64_ONLY(assert(arg_1 != c_rarg2, "smashed arg")); 5895 pass_arg2(this, arg_2); 5896 pass_arg1(this, arg_1); 5897 call_VM(oop_result, last_java_sp, entry_point, 3, check_exceptions); 5898 } 5899 5900 void MacroAssembler::super_call_VM(Register oop_result, 5901 Register last_java_sp, 5902 address entry_point, 5903 int number_of_arguments, 5904 bool check_exceptions) { 5905 Register thread = LP64_ONLY(r15_thread) NOT_LP64(noreg); 5906 MacroAssembler::call_VM_base(oop_result, thread, last_java_sp, entry_point, number_of_arguments, check_exceptions); 5907 } 5908 5909 void MacroAssembler::super_call_VM(Register oop_result, 5910 Register last_java_sp, 5911 address entry_point, 5912 Register arg_1, 5913 bool check_exceptions) { 5914 pass_arg1(this, arg_1); 5915 super_call_VM(oop_result, last_java_sp, entry_point, 1, check_exceptions); 5916 } 5917 5918 void MacroAssembler::super_call_VM(Register oop_result, 5919 Register last_java_sp, 5920 address entry_point, 5921 Register arg_1, 5922 Register arg_2, 5923 bool check_exceptions) { 5924 5925 LP64_ONLY(assert(arg_1 != c_rarg2, "smashed arg")); 5926 pass_arg2(this, arg_2); 5927 pass_arg1(this, arg_1); 5928 super_call_VM(oop_result, last_java_sp, entry_point, 2, check_exceptions); 5929 } 5930 5931 void MacroAssembler::super_call_VM(Register oop_result, 5932 Register last_java_sp, 5933 address entry_point, 5934 Register arg_1, 5935 Register arg_2, 5936 Register arg_3, 5937 bool check_exceptions) { 5938 LP64_ONLY(assert(arg_1 != c_rarg3, "smashed arg")); 5939 LP64_ONLY(assert(arg_2 != c_rarg3, "smashed arg")); 5940 pass_arg3(this, arg_3); 5941 LP64_ONLY(assert(arg_1 != c_rarg2, "smashed arg")); 5942 pass_arg2(this, arg_2); 5943 pass_arg1(this, arg_1); 5944 super_call_VM(oop_result, last_java_sp, entry_point, 3, check_exceptions); 5945 } 5946 5947 void MacroAssembler::call_VM_base(Register oop_result, 5948 Register java_thread, 5949 Register last_java_sp, 5950 address entry_point, 5951 int number_of_arguments, 5952 bool check_exceptions) { 5953 // determine java_thread register 5954 if (!java_thread->is_valid()) { 5955 #ifdef _LP64 5956 java_thread = r15_thread; 5957 #else 5958 java_thread = rdi; 5959 get_thread(java_thread); 5960 #endif // LP64 5961 } 5962 // determine last_java_sp register 5963 if (!last_java_sp->is_valid()) { 5964 last_java_sp = rsp; 5965 } 5966 // debugging support 5967 assert(number_of_arguments >= 0 , "cannot have negative number of arguments"); 5968 LP64_ONLY(assert(java_thread == r15_thread, "unexpected register")); 5969 #ifdef ASSERT 5970 LP64_ONLY(if (UseCompressedOops) verify_heapbase("call_VM_base");) 5971 #endif // ASSERT 5972 5973 assert(java_thread != oop_result , "cannot use the same register for java_thread & oop_result"); 5974 assert(java_thread != last_java_sp, "cannot use the same register for java_thread & last_java_sp"); 5975 5976 // push java thread (becomes first argument of C function) 5977 5978 NOT_LP64(push(java_thread); number_of_arguments++); 5979 LP64_ONLY(mov(c_rarg0, r15_thread)); 5980 5981 // set last Java frame before call 5982 assert(last_java_sp != rbp, "can't use ebp/rbp"); 5983 5984 // Only interpreter should have to set fp 5985 set_last_Java_frame(java_thread, last_java_sp, rbp, NULL); 5986 5987 // do the call, remove parameters 5988 MacroAssembler::call_VM_leaf_base(entry_point, number_of_arguments); 5989 5990 // restore the thread (cannot use the pushed argument since arguments 5991 // may be overwritten by C code generated by an optimizing compiler); 5992 // however can use the register value directly if it is callee saved. 5993 if (LP64_ONLY(true ||) java_thread == rdi || java_thread == rsi) { 5994 // rdi & rsi (also r15) are callee saved -> nothing to do 5995 #ifdef ASSERT 5996 guarantee(java_thread != rax, "change this code"); 5997 push(rax); 5998 { Label L; 5999 get_thread(rax); 6000 cmpptr(java_thread, rax); 6001 jcc(Assembler::equal, L); 6002 stop("MacroAssembler::call_VM_base: rdi not callee saved?"); 6003 bind(L); 6004 } 6005 pop(rax); 6006 #endif 6007 } else { 6008 get_thread(java_thread); 6009 } 6010 // reset last Java frame 6011 // Only interpreter should have to clear fp 6012 reset_last_Java_frame(java_thread, true, false); 6013 6014 #ifndef CC_INTERP 6015 // C++ interp handles this in the interpreter 6016 check_and_handle_popframe(java_thread); 6017 check_and_handle_earlyret(java_thread); 6018 #endif /* CC_INTERP */ 6019 6020 if (check_exceptions) { 6021 // check for pending exceptions (java_thread is set upon return) 6022 cmpptr(Address(java_thread, Thread::pending_exception_offset()), (int32_t) NULL_WORD); 6023 #ifndef _LP64 6024 jump_cc(Assembler::notEqual, 6025 RuntimeAddress(StubRoutines::forward_exception_entry())); 6026 #else 6027 // This used to conditionally jump to forward_exception however it is 6028 // possible if we relocate that the branch will not reach. So we must jump 6029 // around so we can always reach 6030 6031 Label ok; 6032 jcc(Assembler::equal, ok); 6033 jump(RuntimeAddress(StubRoutines::forward_exception_entry())); 6034 bind(ok); 6035 #endif // LP64 6036 } 6037 6038 // get oop result if there is one and reset the value in the thread 6039 if (oop_result->is_valid()) { 6040 movptr(oop_result, Address(java_thread, JavaThread::vm_result_offset())); 6041 movptr(Address(java_thread, JavaThread::vm_result_offset()), NULL_WORD); 6042 verify_oop(oop_result, "broken oop in call_VM_base"); 6043 } 6044 } 6045 6046 void MacroAssembler::call_VM_helper(Register oop_result, address entry_point, int number_of_arguments, bool check_exceptions) { 6047 6048 // Calculate the value for last_Java_sp 6049 // somewhat subtle. call_VM does an intermediate call 6050 // which places a return address on the stack just under the 6051 // stack pointer as the user finsihed with it. This allows 6052 // use to retrieve last_Java_pc from last_Java_sp[-1]. 6053 // On 32bit we then have to push additional args on the stack to accomplish 6054 // the actual requested call. On 64bit call_VM only can use register args 6055 // so the only extra space is the return address that call_VM created. 6056 // This hopefully explains the calculations here. 6057 6058 #ifdef _LP64 6059 // We've pushed one address, correct last_Java_sp 6060 lea(rax, Address(rsp, wordSize)); 6061 #else 6062 lea(rax, Address(rsp, (1 + number_of_arguments) * wordSize)); 6063 #endif // LP64 6064 6065 call_VM_base(oop_result, noreg, rax, entry_point, number_of_arguments, check_exceptions); 6066 6067 } 6068 6069 void MacroAssembler::call_VM_leaf(address entry_point, int number_of_arguments) { 6070 call_VM_leaf_base(entry_point, number_of_arguments); 6071 } 6072 6073 void MacroAssembler::call_VM_leaf(address entry_point, Register arg_0) { 6074 pass_arg0(this, arg_0); 6075 call_VM_leaf(entry_point, 1); 6076 } 6077 6078 void MacroAssembler::call_VM_leaf(address entry_point, Register arg_0, Register arg_1) { 6079 6080 LP64_ONLY(assert(arg_0 != c_rarg1, "smashed arg")); 6081 pass_arg1(this, arg_1); 6082 pass_arg0(this, arg_0); 6083 call_VM_leaf(entry_point, 2); 6084 } 6085 6086 void MacroAssembler::call_VM_leaf(address entry_point, Register arg_0, Register arg_1, Register arg_2) { 6087 LP64_ONLY(assert(arg_0 != c_rarg2, "smashed arg")); 6088 LP64_ONLY(assert(arg_1 != c_rarg2, "smashed arg")); 6089 pass_arg2(this, arg_2); 6090 LP64_ONLY(assert(arg_0 != c_rarg1, "smashed arg")); 6091 pass_arg1(this, arg_1); 6092 pass_arg0(this, arg_0); 6093 call_VM_leaf(entry_point, 3); 6094 } 6095 6096 void MacroAssembler::super_call_VM_leaf(address entry_point, Register arg_0) { 6097 pass_arg0(this, arg_0); 6098 MacroAssembler::call_VM_leaf_base(entry_point, 1); 6099 } 6100 6101 void MacroAssembler::super_call_VM_leaf(address entry_point, Register arg_0, Register arg_1) { 6102 6103 LP64_ONLY(assert(arg_0 != c_rarg1, "smashed arg")); 6104 pass_arg1(this, arg_1); 6105 pass_arg0(this, arg_0); 6106 MacroAssembler::call_VM_leaf_base(entry_point, 2); 6107 } 6108 6109 void MacroAssembler::super_call_VM_leaf(address entry_point, Register arg_0, Register arg_1, Register arg_2) { 6110 LP64_ONLY(assert(arg_0 != c_rarg2, "smashed arg")); 6111 LP64_ONLY(assert(arg_1 != c_rarg2, "smashed arg")); 6112 pass_arg2(this, arg_2); 6113 LP64_ONLY(assert(arg_0 != c_rarg1, "smashed arg")); 6114 pass_arg1(this, arg_1); 6115 pass_arg0(this, arg_0); 6116 MacroAssembler::call_VM_leaf_base(entry_point, 3); 6117 } 6118 6119 void MacroAssembler::super_call_VM_leaf(address entry_point, Register arg_0, Register arg_1, Register arg_2, Register arg_3) { 6120 LP64_ONLY(assert(arg_0 != c_rarg3, "smashed arg")); 6121 LP64_ONLY(assert(arg_1 != c_rarg3, "smashed arg")); 6122 LP64_ONLY(assert(arg_2 != c_rarg3, "smashed arg")); 6123 pass_arg3(this, arg_3); 6124 LP64_ONLY(assert(arg_0 != c_rarg2, "smashed arg")); 6125 LP64_ONLY(assert(arg_1 != c_rarg2, "smashed arg")); 6126 pass_arg2(this, arg_2); 6127 LP64_ONLY(assert(arg_0 != c_rarg1, "smashed arg")); 6128 pass_arg1(this, arg_1); 6129 pass_arg0(this, arg_0); 6130 MacroAssembler::call_VM_leaf_base(entry_point, 4); 6131 } 6132 6133 void MacroAssembler::check_and_handle_earlyret(Register java_thread) { 6134 } 6135 6136 void MacroAssembler::check_and_handle_popframe(Register java_thread) { 6137 } 6138 6139 void MacroAssembler::cmp32(AddressLiteral src1, int32_t imm) { 6140 if (reachable(src1)) { 6141 cmpl(as_Address(src1), imm); 6142 } else { 6143 lea(rscratch1, src1); 6144 cmpl(Address(rscratch1, 0), imm); 6145 } 6146 } 6147 6148 void MacroAssembler::cmp32(Register src1, AddressLiteral src2) { 6149 assert(!src2.is_lval(), "use cmpptr"); 6150 if (reachable(src2)) { 6151 cmpl(src1, as_Address(src2)); 6152 } else { 6153 lea(rscratch1, src2); 6154 cmpl(src1, Address(rscratch1, 0)); 6155 } 6156 } 6157 6158 void MacroAssembler::cmp32(Register src1, int32_t imm) { 6159 Assembler::cmpl(src1, imm); 6160 } 6161 6162 void MacroAssembler::cmp32(Register src1, Address src2) { 6163 Assembler::cmpl(src1, src2); 6164 } 6165 6166 void MacroAssembler::cmpsd2int(XMMRegister opr1, XMMRegister opr2, Register dst, bool unordered_is_less) { 6167 ucomisd(opr1, opr2); 6168 6169 Label L; 6170 if (unordered_is_less) { 6171 movl(dst, -1); 6172 jcc(Assembler::parity, L); 6173 jcc(Assembler::below , L); 6174 movl(dst, 0); 6175 jcc(Assembler::equal , L); 6176 increment(dst); 6177 } else { // unordered is greater 6178 movl(dst, 1); 6179 jcc(Assembler::parity, L); 6180 jcc(Assembler::above , L); 6181 movl(dst, 0); 6182 jcc(Assembler::equal , L); 6183 decrementl(dst); 6184 } 6185 bind(L); 6186 } 6187 6188 void MacroAssembler::cmpss2int(XMMRegister opr1, XMMRegister opr2, Register dst, bool unordered_is_less) { 6189 ucomiss(opr1, opr2); 6190 6191 Label L; 6192 if (unordered_is_less) { 6193 movl(dst, -1); 6194 jcc(Assembler::parity, L); 6195 jcc(Assembler::below , L); 6196 movl(dst, 0); 6197 jcc(Assembler::equal , L); 6198 increment(dst); 6199 } else { // unordered is greater 6200 movl(dst, 1); 6201 jcc(Assembler::parity, L); 6202 jcc(Assembler::above , L); 6203 movl(dst, 0); 6204 jcc(Assembler::equal , L); 6205 decrementl(dst); 6206 } 6207 bind(L); 6208 } 6209 6210 6211 void MacroAssembler::cmp8(AddressLiteral src1, int imm) { 6212 if (reachable(src1)) { 6213 cmpb(as_Address(src1), imm); 6214 } else { 6215 lea(rscratch1, src1); 6216 cmpb(Address(rscratch1, 0), imm); 6217 } 6218 } 6219 6220 void MacroAssembler::cmpptr(Register src1, AddressLiteral src2) { 6221 #ifdef _LP64 6222 if (src2.is_lval()) { 6223 movptr(rscratch1, src2); 6224 Assembler::cmpq(src1, rscratch1); 6225 } else if (reachable(src2)) { 6226 cmpq(src1, as_Address(src2)); 6227 } else { 6228 lea(rscratch1, src2); 6229 Assembler::cmpq(src1, Address(rscratch1, 0)); 6230 } 6231 #else 6232 if (src2.is_lval()) { 6233 cmp_literal32(src1, (int32_t) src2.target(), src2.rspec()); 6234 } else { 6235 cmpl(src1, as_Address(src2)); 6236 } 6237 #endif // _LP64 6238 } 6239 6240 void MacroAssembler::cmpptr(Address src1, AddressLiteral src2) { 6241 assert(src2.is_lval(), "not a mem-mem compare"); 6242 #ifdef _LP64 6243 // moves src2's literal address 6244 movptr(rscratch1, src2); 6245 Assembler::cmpq(src1, rscratch1); 6246 #else 6247 cmp_literal32(src1, (int32_t) src2.target(), src2.rspec()); 6248 #endif // _LP64 6249 } 6250 6251 void MacroAssembler::locked_cmpxchgptr(Register reg, AddressLiteral adr) { 6252 if (reachable(adr)) { 6253 if (os::is_MP()) 6254 lock(); 6255 cmpxchgptr(reg, as_Address(adr)); 6256 } else { 6257 lea(rscratch1, adr); 6258 if (os::is_MP()) 6259 lock(); 6260 cmpxchgptr(reg, Address(rscratch1, 0)); 6261 } 6262 } 6263 6264 void MacroAssembler::cmpxchgptr(Register reg, Address adr) { 6265 LP64_ONLY(cmpxchgq(reg, adr)) NOT_LP64(cmpxchgl(reg, adr)); 6266 } 6267 6268 void MacroAssembler::comisd(XMMRegister dst, AddressLiteral src) { 6269 if (reachable(src)) { 6270 comisd(dst, as_Address(src)); 6271 } else { 6272 lea(rscratch1, src); 6273 comisd(dst, Address(rscratch1, 0)); 6274 } 6275 } 6276 6277 void MacroAssembler::comiss(XMMRegister dst, AddressLiteral src) { 6278 if (reachable(src)) { 6279 comiss(dst, as_Address(src)); 6280 } else { 6281 lea(rscratch1, src); 6282 comiss(dst, Address(rscratch1, 0)); 6283 } 6284 } 6285 6286 6287 void MacroAssembler::cond_inc32(Condition cond, AddressLiteral counter_addr) { 6288 Condition negated_cond = negate_condition(cond); 6289 Label L; 6290 jcc(negated_cond, L); 6291 atomic_incl(counter_addr); 6292 bind(L); 6293 } 6294 6295 int MacroAssembler::corrected_idivl(Register reg) { 6296 // Full implementation of Java idiv and irem; checks for 6297 // special case as described in JVM spec., p.243 & p.271. 6298 // The function returns the (pc) offset of the idivl 6299 // instruction - may be needed for implicit exceptions. 6300 // 6301 // normal case special case 6302 // 6303 // input : rax,: dividend min_int 6304 // reg: divisor (may not be rax,/rdx) -1 6305 // 6306 // output: rax,: quotient (= rax, idiv reg) min_int 6307 // rdx: remainder (= rax, irem reg) 0 6308 assert(reg != rax && reg != rdx, "reg cannot be rax, or rdx register"); 6309 const int min_int = 0x80000000; 6310 Label normal_case, special_case; 6311 6312 // check for special case 6313 cmpl(rax, min_int); 6314 jcc(Assembler::notEqual, normal_case); 6315 xorl(rdx, rdx); // prepare rdx for possible special case (where remainder = 0) 6316 cmpl(reg, -1); 6317 jcc(Assembler::equal, special_case); 6318 6319 // handle normal case 6320 bind(normal_case); 6321 cdql(); 6322 int idivl_offset = offset(); 6323 idivl(reg); 6324 6325 // normal and special case exit 6326 bind(special_case); 6327 6328 return idivl_offset; 6329 } 6330 6331 6332 6333 void MacroAssembler::decrementl(Register reg, int value) { 6334 if (value == min_jint) {subl(reg, value) ; return; } 6335 if (value < 0) { incrementl(reg, -value); return; } 6336 if (value == 0) { ; return; } 6337 if (value == 1 && UseIncDec) { decl(reg) ; return; } 6338 /* else */ { subl(reg, value) ; return; } 6339 } 6340 6341 void MacroAssembler::decrementl(Address dst, int value) { 6342 if (value == min_jint) {subl(dst, value) ; return; } 6343 if (value < 0) { incrementl(dst, -value); return; } 6344 if (value == 0) { ; return; } 6345 if (value == 1 && UseIncDec) { decl(dst) ; return; } 6346 /* else */ { subl(dst, value) ; return; } 6347 } 6348 6349 void MacroAssembler::division_with_shift (Register reg, int shift_value) { 6350 assert (shift_value > 0, "illegal shift value"); 6351 Label _is_positive; 6352 testl (reg, reg); 6353 jcc (Assembler::positive, _is_positive); 6354 int offset = (1 << shift_value) - 1 ; 6355 6356 if (offset == 1) { 6357 incrementl(reg); 6358 } else { 6359 addl(reg, offset); 6360 } 6361 6362 bind (_is_positive); 6363 sarl(reg, shift_value); 6364 } 6365 6366 // !defined(COMPILER2) is because of stupid core builds 6367 #if !defined(_LP64) || defined(COMPILER1) || !defined(COMPILER2) 6368 void MacroAssembler::empty_FPU_stack() { 6369 if (VM_Version::supports_mmx()) { 6370 emms(); 6371 } else { 6372 for (int i = 8; i-- > 0; ) ffree(i); 6373 } 6374 } 6375 #endif // !LP64 || C1 || !C2 6376 6377 6378 // Defines obj, preserves var_size_in_bytes 6379 void MacroAssembler::eden_allocate(Register obj, 6380 Register var_size_in_bytes, 6381 int con_size_in_bytes, 6382 Register t1, 6383 Label& slow_case) { 6384 assert(obj == rax, "obj must be in rax, for cmpxchg"); 6385 assert_different_registers(obj, var_size_in_bytes, t1); 6386 if (CMSIncrementalMode || !Universe::heap()->supports_inline_contig_alloc()) { 6387 jmp(slow_case); 6388 } else { 6389 Register end = t1; 6390 Label retry; 6391 bind(retry); 6392 ExternalAddress heap_top((address) Universe::heap()->top_addr()); 6393 movptr(obj, heap_top); 6394 if (var_size_in_bytes == noreg) { 6395 lea(end, Address(obj, con_size_in_bytes)); 6396 } else { 6397 lea(end, Address(obj, var_size_in_bytes, Address::times_1)); 6398 } 6399 // if end < obj then we wrapped around => object too long => slow case 6400 cmpptr(end, obj); 6401 jcc(Assembler::below, slow_case); 6402 cmpptr(end, ExternalAddress((address) Universe::heap()->end_addr())); 6403 jcc(Assembler::above, slow_case); 6404 // Compare obj with the top addr, and if still equal, store the new top addr in 6405 // end at the address of the top addr pointer. Sets ZF if was equal, and clears 6406 // it otherwise. Use lock prefix for atomicity on MPs. 6407 locked_cmpxchgptr(end, heap_top); 6408 jcc(Assembler::notEqual, retry); 6409 } 6410 } 6411 6412 void MacroAssembler::enter() { 6413 push(rbp); 6414 mov(rbp, rsp); 6415 } 6416 6417 void MacroAssembler::fcmp(Register tmp) { 6418 fcmp(tmp, 1, true, true); 6419 } 6420 6421 void MacroAssembler::fcmp(Register tmp, int index, bool pop_left, bool pop_right) { 6422 assert(!pop_right || pop_left, "usage error"); 6423 if (VM_Version::supports_cmov()) { 6424 assert(tmp == noreg, "unneeded temp"); 6425 if (pop_left) { 6426 fucomip(index); 6427 } else { 6428 fucomi(index); 6429 } 6430 if (pop_right) { 6431 fpop(); 6432 } 6433 } else { 6434 assert(tmp != noreg, "need temp"); 6435 if (pop_left) { 6436 if (pop_right) { 6437 fcompp(); 6438 } else { 6439 fcomp(index); 6440 } 6441 } else { 6442 fcom(index); 6443 } 6444 // convert FPU condition into eflags condition via rax, 6445 save_rax(tmp); 6446 fwait(); fnstsw_ax(); 6447 sahf(); 6448 restore_rax(tmp); 6449 } 6450 // condition codes set as follows: 6451 // 6452 // CF (corresponds to C0) if x < y 6453 // PF (corresponds to C2) if unordered 6454 // ZF (corresponds to C3) if x = y 6455 } 6456 6457 void MacroAssembler::fcmp2int(Register dst, bool unordered_is_less) { 6458 fcmp2int(dst, unordered_is_less, 1, true, true); 6459 } 6460 6461 void MacroAssembler::fcmp2int(Register dst, bool unordered_is_less, int index, bool pop_left, bool pop_right) { 6462 fcmp(VM_Version::supports_cmov() ? noreg : dst, index, pop_left, pop_right); 6463 Label L; 6464 if (unordered_is_less) { 6465 movl(dst, -1); 6466 jcc(Assembler::parity, L); 6467 jcc(Assembler::below , L); 6468 movl(dst, 0); 6469 jcc(Assembler::equal , L); 6470 increment(dst); 6471 } else { // unordered is greater 6472 movl(dst, 1); 6473 jcc(Assembler::parity, L); 6474 jcc(Assembler::above , L); 6475 movl(dst, 0); 6476 jcc(Assembler::equal , L); 6477 decrementl(dst); 6478 } 6479 bind(L); 6480 } 6481 6482 void MacroAssembler::fld_d(AddressLiteral src) { 6483 fld_d(as_Address(src)); 6484 } 6485 6486 void MacroAssembler::fld_s(AddressLiteral src) { 6487 fld_s(as_Address(src)); 6488 } 6489 6490 void MacroAssembler::fld_x(AddressLiteral src) { 6491 Assembler::fld_x(as_Address(src)); 6492 } 6493 6494 void MacroAssembler::fldcw(AddressLiteral src) { 6495 Assembler::fldcw(as_Address(src)); 6496 } 6497 6498 void MacroAssembler::fpop() { 6499 ffree(); 6500 fincstp(); 6501 } 6502 6503 void MacroAssembler::fremr(Register tmp) { 6504 save_rax(tmp); 6505 { Label L; 6506 bind(L); 6507 fprem(); 6508 fwait(); fnstsw_ax(); 6509 #ifdef _LP64 6510 testl(rax, 0x400); 6511 jcc(Assembler::notEqual, L); 6512 #else 6513 sahf(); 6514 jcc(Assembler::parity, L); 6515 #endif // _LP64 6516 } 6517 restore_rax(tmp); 6518 // Result is in ST0. 6519 // Note: fxch & fpop to get rid of ST1 6520 // (otherwise FPU stack could overflow eventually) 6521 fxch(1); 6522 fpop(); 6523 } 6524 6525 6526 void MacroAssembler::incrementl(AddressLiteral dst) { 6527 if (reachable(dst)) { 6528 incrementl(as_Address(dst)); 6529 } else { 6530 lea(rscratch1, dst); 6531 incrementl(Address(rscratch1, 0)); 6532 } 6533 } 6534 6535 void MacroAssembler::incrementl(ArrayAddress dst) { 6536 incrementl(as_Address(dst)); 6537 } 6538 6539 void MacroAssembler::incrementl(Register reg, int value) { 6540 if (value == min_jint) {addl(reg, value) ; return; } 6541 if (value < 0) { decrementl(reg, -value); return; } 6542 if (value == 0) { ; return; } 6543 if (value == 1 && UseIncDec) { incl(reg) ; return; } 6544 /* else */ { addl(reg, value) ; return; } 6545 } 6546 6547 void MacroAssembler::incrementl(Address dst, int value) { 6548 if (value == min_jint) {addl(dst, value) ; return; } 6549 if (value < 0) { decrementl(dst, -value); return; } 6550 if (value == 0) { ; return; } 6551 if (value == 1 && UseIncDec) { incl(dst) ; return; } 6552 /* else */ { addl(dst, value) ; return; } 6553 } 6554 6555 void MacroAssembler::jump(AddressLiteral dst) { 6556 if (reachable(dst)) { 6557 jmp_literal(dst.target(), dst.rspec()); 6558 } else { 6559 lea(rscratch1, dst); 6560 jmp(rscratch1); 6561 } 6562 } 6563 6564 void MacroAssembler::jump_cc(Condition cc, AddressLiteral dst) { 6565 if (reachable(dst)) { 6566 InstructionMark im(this); 6567 relocate(dst.reloc()); 6568 const int short_size = 2; 6569 const int long_size = 6; 6570 int offs = (intptr_t)dst.target() - ((intptr_t)_code_pos); 6571 if (dst.reloc() == relocInfo::none && is8bit(offs - short_size)) { 6572 // 0111 tttn #8-bit disp 6573 emit_byte(0x70 | cc); 6574 emit_byte((offs - short_size) & 0xFF); 6575 } else { 6576 // 0000 1111 1000 tttn #32-bit disp 6577 emit_byte(0x0F); 6578 emit_byte(0x80 | cc); 6579 emit_long(offs - long_size); 6580 } 6581 } else { 6582 #ifdef ASSERT 6583 warning("reversing conditional branch"); 6584 #endif /* ASSERT */ 6585 Label skip; 6586 jccb(reverse[cc], skip); 6587 lea(rscratch1, dst); 6588 Assembler::jmp(rscratch1); 6589 bind(skip); 6590 } 6591 } 6592 6593 void MacroAssembler::ldmxcsr(AddressLiteral src) { 6594 if (reachable(src)) { 6595 Assembler::ldmxcsr(as_Address(src)); 6596 } else { 6597 lea(rscratch1, src); 6598 Assembler::ldmxcsr(Address(rscratch1, 0)); 6599 } 6600 } 6601 6602 int MacroAssembler::load_signed_byte(Register dst, Address src) { 6603 int off; 6604 if (LP64_ONLY(true ||) VM_Version::is_P6()) { 6605 off = offset(); 6606 movsbl(dst, src); // movsxb 6607 } else { 6608 off = load_unsigned_byte(dst, src); 6609 shll(dst, 24); 6610 sarl(dst, 24); 6611 } 6612 return off; 6613 } 6614 6615 // Note: load_signed_short used to be called load_signed_word. 6616 // Although the 'w' in x86 opcodes refers to the term "word" in the assembler 6617 // manual, which means 16 bits, that usage is found nowhere in HotSpot code. 6618 // The term "word" in HotSpot means a 32- or 64-bit machine word. 6619 int MacroAssembler::load_signed_short(Register dst, Address src) { 6620 int off; 6621 if (LP64_ONLY(true ||) VM_Version::is_P6()) { 6622 // This is dubious to me since it seems safe to do a signed 16 => 64 bit 6623 // version but this is what 64bit has always done. This seems to imply 6624 // that users are only using 32bits worth. 6625 off = offset(); 6626 movswl(dst, src); // movsxw 6627 } else { 6628 off = load_unsigned_short(dst, src); 6629 shll(dst, 16); 6630 sarl(dst, 16); 6631 } 6632 return off; 6633 } 6634 6635 int MacroAssembler::load_unsigned_byte(Register dst, Address src) { 6636 // According to Intel Doc. AP-526, "Zero-Extension of Short", p.16, 6637 // and "3.9 Partial Register Penalties", p. 22). 6638 int off; 6639 if (LP64_ONLY(true || ) VM_Version::is_P6() || src.uses(dst)) { 6640 off = offset(); 6641 movzbl(dst, src); // movzxb 6642 } else { 6643 xorl(dst, dst); 6644 off = offset(); 6645 movb(dst, src); 6646 } 6647 return off; 6648 } 6649 6650 // Note: load_unsigned_short used to be called load_unsigned_word. 6651 int MacroAssembler::load_unsigned_short(Register dst, Address src) { 6652 // According to Intel Doc. AP-526, "Zero-Extension of Short", p.16, 6653 // and "3.9 Partial Register Penalties", p. 22). 6654 int off; 6655 if (LP64_ONLY(true ||) VM_Version::is_P6() || src.uses(dst)) { 6656 off = offset(); 6657 movzwl(dst, src); // movzxw 6658 } else { 6659 xorl(dst, dst); 6660 off = offset(); 6661 movw(dst, src); 6662 } 6663 return off; 6664 } 6665 6666 void MacroAssembler::load_sized_value(Register dst, Address src, size_t size_in_bytes, bool is_signed, Register dst2) { 6667 switch (size_in_bytes) { 6668 #ifndef _LP64 6669 case 8: 6670 assert(dst2 != noreg, "second dest register required"); 6671 movl(dst, src); 6672 movl(dst2, src.plus_disp(BytesPerInt)); 6673 break; 6674 #else 6675 case 8: movq(dst, src); break; 6676 #endif 6677 case 4: movl(dst, src); break; 6678 case 2: is_signed ? load_signed_short(dst, src) : load_unsigned_short(dst, src); break; 6679 case 1: is_signed ? load_signed_byte( dst, src) : load_unsigned_byte( dst, src); break; 6680 default: ShouldNotReachHere(); 6681 } 6682 } 6683 6684 void MacroAssembler::store_sized_value(Address dst, Register src, size_t size_in_bytes, Register src2) { 6685 switch (size_in_bytes) { 6686 #ifndef _LP64 6687 case 8: 6688 assert(src2 != noreg, "second source register required"); 6689 movl(dst, src); 6690 movl(dst.plus_disp(BytesPerInt), src2); 6691 break; 6692 #else 6693 case 8: movq(dst, src); break; 6694 #endif 6695 case 4: movl(dst, src); break; 6696 case 2: movw(dst, src); break; 6697 case 1: movb(dst, src); break; 6698 default: ShouldNotReachHere(); 6699 } 6700 } 6701 6702 void MacroAssembler::mov32(AddressLiteral dst, Register src) { 6703 if (reachable(dst)) { 6704 movl(as_Address(dst), src); 6705 } else { 6706 lea(rscratch1, dst); 6707 movl(Address(rscratch1, 0), src); 6708 } 6709 } 6710 6711 void MacroAssembler::mov32(Register dst, AddressLiteral src) { 6712 if (reachable(src)) { 6713 movl(dst, as_Address(src)); 6714 } else { 6715 lea(rscratch1, src); 6716 movl(dst, Address(rscratch1, 0)); 6717 } 6718 } 6719 6720 // C++ bool manipulation 6721 6722 void MacroAssembler::movbool(Register dst, Address src) { 6723 if(sizeof(bool) == 1) 6724 movb(dst, src); 6725 else if(sizeof(bool) == 2) 6726 movw(dst, src); 6727 else if(sizeof(bool) == 4) 6728 movl(dst, src); 6729 else 6730 // unsupported 6731 ShouldNotReachHere(); 6732 } 6733 6734 void MacroAssembler::movbool(Address dst, bool boolconst) { 6735 if(sizeof(bool) == 1) 6736 movb(dst, (int) boolconst); 6737 else if(sizeof(bool) == 2) 6738 movw(dst, (int) boolconst); 6739 else if(sizeof(bool) == 4) 6740 movl(dst, (int) boolconst); 6741 else 6742 // unsupported 6743 ShouldNotReachHere(); 6744 } 6745 6746 void MacroAssembler::movbool(Address dst, Register src) { 6747 if(sizeof(bool) == 1) 6748 movb(dst, src); 6749 else if(sizeof(bool) == 2) 6750 movw(dst, src); 6751 else if(sizeof(bool) == 4) 6752 movl(dst, src); 6753 else 6754 // unsupported 6755 ShouldNotReachHere(); 6756 } 6757 6758 void MacroAssembler::movbyte(ArrayAddress dst, int src) { 6759 movb(as_Address(dst), src); 6760 } 6761 6762 void MacroAssembler::movdbl(XMMRegister dst, AddressLiteral src) { 6763 if (reachable(src)) { 6764 if (UseXmmLoadAndClearUpper) { 6765 movsd (dst, as_Address(src)); 6766 } else { 6767 movlpd(dst, as_Address(src)); 6768 } 6769 } else { 6770 lea(rscratch1, src); 6771 if (UseXmmLoadAndClearUpper) { 6772 movsd (dst, Address(rscratch1, 0)); 6773 } else { 6774 movlpd(dst, Address(rscratch1, 0)); 6775 } 6776 } 6777 } 6778 6779 void MacroAssembler::movflt(XMMRegister dst, AddressLiteral src) { 6780 if (reachable(src)) { 6781 movss(dst, as_Address(src)); 6782 } else { 6783 lea(rscratch1, src); 6784 movss(dst, Address(rscratch1, 0)); 6785 } 6786 } 6787 6788 void MacroAssembler::movptr(Register dst, Register src) { 6789 LP64_ONLY(movq(dst, src)) NOT_LP64(movl(dst, src)); 6790 } 6791 6792 void MacroAssembler::movptr(Register dst, Address src) { 6793 LP64_ONLY(movq(dst, src)) NOT_LP64(movl(dst, src)); 6794 } 6795 6796 // src should NEVER be a real pointer. Use AddressLiteral for true pointers 6797 void MacroAssembler::movptr(Register dst, intptr_t src) { 6798 LP64_ONLY(mov64(dst, src)) NOT_LP64(movl(dst, src)); 6799 } 6800 6801 void MacroAssembler::movptr(Address dst, Register src) { 6802 LP64_ONLY(movq(dst, src)) NOT_LP64(movl(dst, src)); 6803 } 6804 6805 void MacroAssembler::movss(XMMRegister dst, AddressLiteral src) { 6806 if (reachable(src)) { 6807 movss(dst, as_Address(src)); 6808 } else { 6809 lea(rscratch1, src); 6810 movss(dst, Address(rscratch1, 0)); 6811 } 6812 } 6813 6814 void MacroAssembler::null_check(Register reg, int offset) { 6815 if (needs_explicit_null_check(offset)) { 6816 // provoke OS NULL exception if reg = NULL by 6817 // accessing M[reg] w/o changing any (non-CC) registers 6818 // NOTE: cmpl is plenty here to provoke a segv 6819 cmpptr(rax, Address(reg, 0)); 6820 // Note: should probably use testl(rax, Address(reg, 0)); 6821 // may be shorter code (however, this version of 6822 // testl needs to be implemented first) 6823 } else { 6824 // nothing to do, (later) access of M[reg + offset] 6825 // will provoke OS NULL exception if reg = NULL 6826 } 6827 } 6828 6829 void MacroAssembler::os_breakpoint() { 6830 // instead of directly emitting a breakpoint, call os:breakpoint for better debugability 6831 // (e.g., MSVC can't call ps() otherwise) 6832 call(RuntimeAddress(CAST_FROM_FN_PTR(address, os::breakpoint))); 6833 } 6834 6835 void MacroAssembler::pop_CPU_state() { 6836 pop_FPU_state(); 6837 pop_IU_state(); 6838 } 6839 6840 void MacroAssembler::pop_FPU_state() { 6841 NOT_LP64(frstor(Address(rsp, 0));) 6842 LP64_ONLY(fxrstor(Address(rsp, 0));) 6843 addptr(rsp, FPUStateSizeInWords * wordSize); 6844 } 6845 6846 void MacroAssembler::pop_IU_state() { 6847 popa(); 6848 LP64_ONLY(addq(rsp, 8)); 6849 popf(); 6850 } 6851 6852 // Save Integer and Float state 6853 // Warning: Stack must be 16 byte aligned (64bit) 6854 void MacroAssembler::push_CPU_state() { 6855 push_IU_state(); 6856 push_FPU_state(); 6857 } 6858 6859 void MacroAssembler::push_FPU_state() { 6860 subptr(rsp, FPUStateSizeInWords * wordSize); 6861 #ifndef _LP64 6862 fnsave(Address(rsp, 0)); 6863 fwait(); 6864 #else 6865 fxsave(Address(rsp, 0)); 6866 #endif // LP64 6867 } 6868 6869 void MacroAssembler::push_IU_state() { 6870 // Push flags first because pusha kills them 6871 pushf(); 6872 // Make sure rsp stays 16-byte aligned 6873 LP64_ONLY(subq(rsp, 8)); 6874 pusha(); 6875 } 6876 6877 void MacroAssembler::reset_last_Java_frame(Register java_thread, bool clear_fp, bool clear_pc) { 6878 // determine java_thread register 6879 if (!java_thread->is_valid()) { 6880 java_thread = rdi; 6881 get_thread(java_thread); 6882 } 6883 // we must set sp to zero to clear frame 6884 movptr(Address(java_thread, JavaThread::last_Java_sp_offset()), NULL_WORD); 6885 if (clear_fp) { 6886 movptr(Address(java_thread, JavaThread::last_Java_fp_offset()), NULL_WORD); 6887 } 6888 6889 if (clear_pc) 6890 movptr(Address(java_thread, JavaThread::last_Java_pc_offset()), NULL_WORD); 6891 6892 } 6893 6894 void MacroAssembler::restore_rax(Register tmp) { 6895 if (tmp == noreg) pop(rax); 6896 else if (tmp != rax) mov(rax, tmp); 6897 } 6898 6899 void MacroAssembler::round_to(Register reg, int modulus) { 6900 addptr(reg, modulus - 1); 6901 andptr(reg, -modulus); 6902 } 6903 6904 void MacroAssembler::save_rax(Register tmp) { 6905 if (tmp == noreg) push(rax); 6906 else if (tmp != rax) mov(tmp, rax); 6907 } 6908 6909 // Write serialization page so VM thread can do a pseudo remote membar. 6910 // We use the current thread pointer to calculate a thread specific 6911 // offset to write to within the page. This minimizes bus traffic 6912 // due to cache line collision. 6913 void MacroAssembler::serialize_memory(Register thread, Register tmp) { 6914 movl(tmp, thread); 6915 shrl(tmp, os::get_serialize_page_shift_count()); 6916 andl(tmp, (os::vm_page_size() - sizeof(int))); 6917 6918 Address index(noreg, tmp, Address::times_1); 6919 ExternalAddress page(os::get_memory_serialize_page()); 6920 6921 // Size of store must match masking code above 6922 movl(as_Address(ArrayAddress(page, index)), tmp); 6923 } 6924 6925 // Calls to C land 6926 // 6927 // When entering C land, the rbp, & rsp of the last Java frame have to be recorded 6928 // in the (thread-local) JavaThread object. When leaving C land, the last Java fp 6929 // has to be reset to 0. This is required to allow proper stack traversal. 6930 void MacroAssembler::set_last_Java_frame(Register java_thread, 6931 Register last_java_sp, 6932 Register last_java_fp, 6933 address last_java_pc) { 6934 // determine java_thread register 6935 if (!java_thread->is_valid()) { 6936 java_thread = rdi; 6937 get_thread(java_thread); 6938 } 6939 // determine last_java_sp register 6940 if (!last_java_sp->is_valid()) { 6941 last_java_sp = rsp; 6942 } 6943 6944 // last_java_fp is optional 6945 6946 if (last_java_fp->is_valid()) { 6947 movptr(Address(java_thread, JavaThread::last_Java_fp_offset()), last_java_fp); 6948 } 6949 6950 // last_java_pc is optional 6951 6952 if (last_java_pc != NULL) { 6953 lea(Address(java_thread, 6954 JavaThread::frame_anchor_offset() + JavaFrameAnchor::last_Java_pc_offset()), 6955 InternalAddress(last_java_pc)); 6956 6957 } 6958 movptr(Address(java_thread, JavaThread::last_Java_sp_offset()), last_java_sp); 6959 } 6960 6961 void MacroAssembler::shlptr(Register dst, int imm8) { 6962 LP64_ONLY(shlq(dst, imm8)) NOT_LP64(shll(dst, imm8)); 6963 } 6964 6965 void MacroAssembler::shrptr(Register dst, int imm8) { 6966 LP64_ONLY(shrq(dst, imm8)) NOT_LP64(shrl(dst, imm8)); 6967 } 6968 6969 void MacroAssembler::sign_extend_byte(Register reg) { 6970 if (LP64_ONLY(true ||) (VM_Version::is_P6() && reg->has_byte_register())) { 6971 movsbl(reg, reg); // movsxb 6972 } else { 6973 shll(reg, 24); 6974 sarl(reg, 24); 6975 } 6976 } 6977 6978 void MacroAssembler::sign_extend_short(Register reg) { 6979 if (LP64_ONLY(true ||) VM_Version::is_P6()) { 6980 movswl(reg, reg); // movsxw 6981 } else { 6982 shll(reg, 16); 6983 sarl(reg, 16); 6984 } 6985 } 6986 6987 void MacroAssembler::testl(Register dst, AddressLiteral src) { 6988 assert(reachable(src), "Address should be reachable"); 6989 testl(dst, as_Address(src)); 6990 } 6991 6992 ////////////////////////////////////////////////////////////////////////////////// 6993 #ifndef SERIALGC 6994 6995 void MacroAssembler::g1_write_barrier_pre(Register obj, 6996 Register pre_val, 6997 Register thread, 6998 Register tmp, 6999 bool tosca_live, 7000 bool expand_call) { 7001 7002 // If expand_call is true then we expand the call_VM_leaf macro 7003 // directly to skip generating the check by 7004 // InterpreterMacroAssembler::call_VM_leaf_base that checks _last_sp. 7005 7006 #ifdef _LP64 7007 assert(thread == r15_thread, "must be"); 7008 #endif // _LP64 7009 7010 Label done; 7011 Label runtime; 7012 7013 assert(pre_val != noreg, "check this code"); 7014 7015 if (obj != noreg) { 7016 assert_different_registers(obj, pre_val, tmp); 7017 assert(pre_val != rax, "check this code"); 7018 } 7019 7020 Address in_progress(thread, in_bytes(JavaThread::satb_mark_queue_offset() + 7021 PtrQueue::byte_offset_of_active())); 7022 Address index(thread, in_bytes(JavaThread::satb_mark_queue_offset() + 7023 PtrQueue::byte_offset_of_index())); 7024 Address buffer(thread, in_bytes(JavaThread::satb_mark_queue_offset() + 7025 PtrQueue::byte_offset_of_buf())); 7026 7027 7028 // Is marking active? 7029 if (in_bytes(PtrQueue::byte_width_of_active()) == 4) { 7030 cmpl(in_progress, 0); 7031 } else { 7032 assert(in_bytes(PtrQueue::byte_width_of_active()) == 1, "Assumption"); 7033 cmpb(in_progress, 0); 7034 } 7035 jcc(Assembler::equal, done); 7036 7037 // Do we need to load the previous value? 7038 if (obj != noreg) { 7039 load_heap_oop(pre_val, Address(obj, 0)); 7040 } 7041 7042 // Is the previous value null? 7043 cmpptr(pre_val, (int32_t) NULL_WORD); 7044 jcc(Assembler::equal, done); 7045 7046 // Can we store original value in the thread's buffer? 7047 // Is index == 0? 7048 // (The index field is typed as size_t.) 7049 7050 movptr(tmp, index); // tmp := *index_adr 7051 cmpptr(tmp, 0); // tmp == 0? 7052 jcc(Assembler::equal, runtime); // If yes, goto runtime 7053 7054 subptr(tmp, wordSize); // tmp := tmp - wordSize 7055 movptr(index, tmp); // *index_adr := tmp 7056 addptr(tmp, buffer); // tmp := tmp + *buffer_adr 7057 7058 // Record the previous value 7059 movptr(Address(tmp, 0), pre_val); 7060 jmp(done); 7061 7062 bind(runtime); 7063 // save the live input values 7064 if(tosca_live) push(rax); 7065 7066 if (obj != noreg && obj != rax) 7067 push(obj); 7068 7069 if (pre_val != rax) 7070 push(pre_val); 7071 7072 // Calling the runtime using the regular call_VM_leaf mechanism generates 7073 // code (generated by InterpreterMacroAssember::call_VM_leaf_base) 7074 // that checks that the *(ebp+frame::interpreter_frame_last_sp) == NULL. 7075 // 7076 // If we care generating the pre-barrier without a frame (e.g. in the 7077 // intrinsified Reference.get() routine) then ebp might be pointing to 7078 // the caller frame and so this check will most likely fail at runtime. 7079 // 7080 // Expanding the call directly bypasses the generation of the check. 7081 // So when we do not have have a full interpreter frame on the stack 7082 // expand_call should be passed true. 7083 7084 NOT_LP64( push(thread); ) 7085 7086 if (expand_call) { 7087 LP64_ONLY( assert(pre_val != c_rarg1, "smashed arg"); ) 7088 pass_arg1(this, thread); 7089 pass_arg0(this, pre_val); 7090 MacroAssembler::call_VM_leaf_base(CAST_FROM_FN_PTR(address, SharedRuntime::g1_wb_pre), 2); 7091 } else { 7092 call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::g1_wb_pre), pre_val, thread); 7093 } 7094 7095 NOT_LP64( pop(thread); ) 7096 7097 // save the live input values 7098 if (pre_val != rax) 7099 pop(pre_val); 7100 7101 if (obj != noreg && obj != rax) 7102 pop(obj); 7103 7104 if(tosca_live) pop(rax); 7105 7106 bind(done); 7107 } 7108 7109 void MacroAssembler::g1_write_barrier_post(Register store_addr, 7110 Register new_val, 7111 Register thread, 7112 Register tmp, 7113 Register tmp2) { 7114 #ifdef _LP64 7115 assert(thread == r15_thread, "must be"); 7116 #endif // _LP64 7117 7118 Address queue_index(thread, in_bytes(JavaThread::dirty_card_queue_offset() + 7119 PtrQueue::byte_offset_of_index())); 7120 Address buffer(thread, in_bytes(JavaThread::dirty_card_queue_offset() + 7121 PtrQueue::byte_offset_of_buf())); 7122 7123 BarrierSet* bs = Universe::heap()->barrier_set(); 7124 CardTableModRefBS* ct = (CardTableModRefBS*)bs; 7125 Label done; 7126 Label runtime; 7127 7128 // Does store cross heap regions? 7129 7130 movptr(tmp, store_addr); 7131 xorptr(tmp, new_val); 7132 shrptr(tmp, HeapRegion::LogOfHRGrainBytes); 7133 jcc(Assembler::equal, done); 7134 7135 // crosses regions, storing NULL? 7136 7137 cmpptr(new_val, (int32_t) NULL_WORD); 7138 jcc(Assembler::equal, done); 7139 7140 // storing region crossing non-NULL, is card already dirty? 7141 7142 ExternalAddress cardtable((address) ct->byte_map_base); 7143 assert(sizeof(*ct->byte_map_base) == sizeof(jbyte), "adjust this code"); 7144 #ifdef _LP64 7145 const Register card_addr = tmp; 7146 7147 movq(card_addr, store_addr); 7148 shrq(card_addr, CardTableModRefBS::card_shift); 7149 7150 lea(tmp2, cardtable); 7151 7152 // get the address of the card 7153 addq(card_addr, tmp2); 7154 #else 7155 const Register card_index = tmp; 7156 7157 movl(card_index, store_addr); 7158 shrl(card_index, CardTableModRefBS::card_shift); 7159 7160 Address index(noreg, card_index, Address::times_1); 7161 const Register card_addr = tmp; 7162 lea(card_addr, as_Address(ArrayAddress(cardtable, index))); 7163 #endif 7164 cmpb(Address(card_addr, 0), 0); 7165 jcc(Assembler::equal, done); 7166 7167 // storing a region crossing, non-NULL oop, card is clean. 7168 // dirty card and log. 7169 7170 movb(Address(card_addr, 0), 0); 7171 7172 cmpl(queue_index, 0); 7173 jcc(Assembler::equal, runtime); 7174 subl(queue_index, wordSize); 7175 movptr(tmp2, buffer); 7176 #ifdef _LP64 7177 movslq(rscratch1, queue_index); 7178 addq(tmp2, rscratch1); 7179 movq(Address(tmp2, 0), card_addr); 7180 #else 7181 addl(tmp2, queue_index); 7182 movl(Address(tmp2, 0), card_index); 7183 #endif 7184 jmp(done); 7185 7186 bind(runtime); 7187 // save the live input values 7188 push(store_addr); 7189 push(new_val); 7190 #ifdef _LP64 7191 call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::g1_wb_post), card_addr, r15_thread); 7192 #else 7193 push(thread); 7194 call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::g1_wb_post), card_addr, thread); 7195 pop(thread); 7196 #endif 7197 pop(new_val); 7198 pop(store_addr); 7199 7200 bind(done); 7201 } 7202 7203 #endif // SERIALGC 7204 ////////////////////////////////////////////////////////////////////////////////// 7205 7206 7207 void MacroAssembler::store_check(Register obj) { 7208 // Does a store check for the oop in register obj. The content of 7209 // register obj is destroyed afterwards. 7210 store_check_part_1(obj); 7211 store_check_part_2(obj); 7212 } 7213 7214 void MacroAssembler::store_check(Register obj, Address dst) { 7215 store_check(obj); 7216 } 7217 7218 7219 // split the store check operation so that other instructions can be scheduled inbetween 7220 void MacroAssembler::store_check_part_1(Register obj) { 7221 BarrierSet* bs = Universe::heap()->barrier_set(); 7222 assert(bs->kind() == BarrierSet::CardTableModRef, "Wrong barrier set kind"); 7223 shrptr(obj, CardTableModRefBS::card_shift); 7224 } 7225 7226 void MacroAssembler::store_check_part_2(Register obj) { 7227 BarrierSet* bs = Universe::heap()->barrier_set(); 7228 assert(bs->kind() == BarrierSet::CardTableModRef, "Wrong barrier set kind"); 7229 CardTableModRefBS* ct = (CardTableModRefBS*)bs; 7230 assert(sizeof(*ct->byte_map_base) == sizeof(jbyte), "adjust this code"); 7231 7232 // The calculation for byte_map_base is as follows: 7233 // byte_map_base = _byte_map - (uintptr_t(low_bound) >> card_shift); 7234 // So this essentially converts an address to a displacement and 7235 // it will never need to be relocated. On 64bit however the value may be too 7236 // large for a 32bit displacement 7237 7238 intptr_t disp = (intptr_t) ct->byte_map_base; 7239 if (is_simm32(disp)) { 7240 Address cardtable(noreg, obj, Address::times_1, disp); 7241 movb(cardtable, 0); 7242 } else { 7243 // By doing it as an ExternalAddress disp could be converted to a rip-relative 7244 // displacement and done in a single instruction given favorable mapping and 7245 // a smarter version of as_Address. Worst case it is two instructions which 7246 // is no worse off then loading disp into a register and doing as a simple 7247 // Address() as above. 7248 // We can't do as ExternalAddress as the only style since if disp == 0 we'll 7249 // assert since NULL isn't acceptable in a reloci (see 6644928). In any case 7250 // in some cases we'll get a single instruction version. 7251 7252 ExternalAddress cardtable((address)disp); 7253 Address index(noreg, obj, Address::times_1); 7254 movb(as_Address(ArrayAddress(cardtable, index)), 0); 7255 } 7256 } 7257 7258 void MacroAssembler::subptr(Register dst, int32_t imm32) { 7259 LP64_ONLY(subq(dst, imm32)) NOT_LP64(subl(dst, imm32)); 7260 } 7261 7262 void MacroAssembler::subptr(Register dst, Register src) { 7263 LP64_ONLY(subq(dst, src)) NOT_LP64(subl(dst, src)); 7264 } 7265 7266 // C++ bool manipulation 7267 void MacroAssembler::testbool(Register dst) { 7268 if(sizeof(bool) == 1) 7269 testb(dst, 0xff); 7270 else if(sizeof(bool) == 2) { 7271 // testw implementation needed for two byte bools 7272 ShouldNotReachHere(); 7273 } else if(sizeof(bool) == 4) 7274 testl(dst, dst); 7275 else 7276 // unsupported 7277 ShouldNotReachHere(); 7278 } 7279 7280 void MacroAssembler::testptr(Register dst, Register src) { 7281 LP64_ONLY(testq(dst, src)) NOT_LP64(testl(dst, src)); 7282 } 7283 7284 // Defines obj, preserves var_size_in_bytes, okay for t2 == var_size_in_bytes. 7285 void MacroAssembler::tlab_allocate(Register obj, 7286 Register var_size_in_bytes, 7287 int con_size_in_bytes, 7288 Register t1, 7289 Register t2, 7290 Label& slow_case) { 7291 assert_different_registers(obj, t1, t2); 7292 assert_different_registers(obj, var_size_in_bytes, t1); 7293 Register end = t2; 7294 Register thread = NOT_LP64(t1) LP64_ONLY(r15_thread); 7295 7296 verify_tlab(); 7297 7298 NOT_LP64(get_thread(thread)); 7299 7300 movptr(obj, Address(thread, JavaThread::tlab_top_offset())); 7301 if (var_size_in_bytes == noreg) { 7302 lea(end, Address(obj, con_size_in_bytes)); 7303 } else { 7304 lea(end, Address(obj, var_size_in_bytes, Address::times_1)); 7305 } 7306 cmpptr(end, Address(thread, JavaThread::tlab_end_offset())); 7307 jcc(Assembler::above, slow_case); 7308 7309 // update the tlab top pointer 7310 movptr(Address(thread, JavaThread::tlab_top_offset()), end); 7311 7312 // recover var_size_in_bytes if necessary 7313 if (var_size_in_bytes == end) { 7314 subptr(var_size_in_bytes, obj); 7315 } 7316 verify_tlab(); 7317 } 7318 7319 // Preserves rbx, and rdx. 7320 Register MacroAssembler::tlab_refill(Label& retry, 7321 Label& try_eden, 7322 Label& slow_case) { 7323 Register top = rax; 7324 Register t1 = rcx; 7325 Register t2 = rsi; 7326 Register thread_reg = NOT_LP64(rdi) LP64_ONLY(r15_thread); 7327 assert_different_registers(top, thread_reg, t1, t2, /* preserve: */ rbx, rdx); 7328 Label do_refill, discard_tlab; 7329 7330 if (CMSIncrementalMode || !Universe::heap()->supports_inline_contig_alloc()) { 7331 // No allocation in the shared eden. 7332 jmp(slow_case); 7333 } 7334 7335 NOT_LP64(get_thread(thread_reg)); 7336 7337 movptr(top, Address(thread_reg, in_bytes(JavaThread::tlab_top_offset()))); 7338 movptr(t1, Address(thread_reg, in_bytes(JavaThread::tlab_end_offset()))); 7339 7340 // calculate amount of free space 7341 subptr(t1, top); 7342 shrptr(t1, LogHeapWordSize); 7343 7344 // Retain tlab and allocate object in shared space if 7345 // the amount free in the tlab is too large to discard. 7346 cmpptr(t1, Address(thread_reg, in_bytes(JavaThread::tlab_refill_waste_limit_offset()))); 7347 jcc(Assembler::lessEqual, discard_tlab); 7348 7349 // Retain 7350 // %%% yuck as movptr... 7351 movptr(t2, (int32_t) ThreadLocalAllocBuffer::refill_waste_limit_increment()); 7352 addptr(Address(thread_reg, in_bytes(JavaThread::tlab_refill_waste_limit_offset())), t2); 7353 if (TLABStats) { 7354 // increment number of slow_allocations 7355 addl(Address(thread_reg, in_bytes(JavaThread::tlab_slow_allocations_offset())), 1); 7356 } 7357 jmp(try_eden); 7358 7359 bind(discard_tlab); 7360 if (TLABStats) { 7361 // increment number of refills 7362 addl(Address(thread_reg, in_bytes(JavaThread::tlab_number_of_refills_offset())), 1); 7363 // accumulate wastage -- t1 is amount free in tlab 7364 addl(Address(thread_reg, in_bytes(JavaThread::tlab_fast_refill_waste_offset())), t1); 7365 } 7366 7367 // if tlab is currently allocated (top or end != null) then 7368 // fill [top, end + alignment_reserve) with array object 7369 testptr(top, top); 7370 jcc(Assembler::zero, do_refill); 7371 7372 // set up the mark word 7373 movptr(Address(top, oopDesc::mark_offset_in_bytes()), (intptr_t)markOopDesc::prototype()->copy_set_hash(0x2)); 7374 // set the length to the remaining space 7375 subptr(t1, typeArrayOopDesc::header_size(T_INT)); 7376 addptr(t1, (int32_t)ThreadLocalAllocBuffer::alignment_reserve()); 7377 shlptr(t1, log2_intptr(HeapWordSize/sizeof(jint))); 7378 movl(Address(top, arrayOopDesc::length_offset_in_bytes()), t1); 7379 // set klass to intArrayKlass 7380 // dubious reloc why not an oop reloc? 7381 movptr(t1, ExternalAddress((address)Universe::intArrayKlassObj_addr())); 7382 // store klass last. concurrent gcs assumes klass length is valid if 7383 // klass field is not null. 7384 store_klass(top, t1); 7385 7386 movptr(t1, top); 7387 subptr(t1, Address(thread_reg, in_bytes(JavaThread::tlab_start_offset()))); 7388 incr_allocated_bytes(thread_reg, t1, 0); 7389 7390 // refill the tlab with an eden allocation 7391 bind(do_refill); 7392 movptr(t1, Address(thread_reg, in_bytes(JavaThread::tlab_size_offset()))); 7393 shlptr(t1, LogHeapWordSize); 7394 // allocate new tlab, address returned in top 7395 eden_allocate(top, t1, 0, t2, slow_case); 7396 7397 // Check that t1 was preserved in eden_allocate. 7398 #ifdef ASSERT 7399 if (UseTLAB) { 7400 Label ok; 7401 Register tsize = rsi; 7402 assert_different_registers(tsize, thread_reg, t1); 7403 push(tsize); 7404 movptr(tsize, Address(thread_reg, in_bytes(JavaThread::tlab_size_offset()))); 7405 shlptr(tsize, LogHeapWordSize); 7406 cmpptr(t1, tsize); 7407 jcc(Assembler::equal, ok); 7408 stop("assert(t1 != tlab size)"); 7409 should_not_reach_here(); 7410 7411 bind(ok); 7412 pop(tsize); 7413 } 7414 #endif 7415 movptr(Address(thread_reg, in_bytes(JavaThread::tlab_start_offset())), top); 7416 movptr(Address(thread_reg, in_bytes(JavaThread::tlab_top_offset())), top); 7417 addptr(top, t1); 7418 subptr(top, (int32_t)ThreadLocalAllocBuffer::alignment_reserve_in_bytes()); 7419 movptr(Address(thread_reg, in_bytes(JavaThread::tlab_end_offset())), top); 7420 verify_tlab(); 7421 jmp(retry); 7422 7423 return thread_reg; // for use by caller 7424 } 7425 7426 void MacroAssembler::incr_allocated_bytes(Register thread, 7427 Register var_size_in_bytes, 7428 int con_size_in_bytes, 7429 Register t1) { 7430 #ifdef _LP64 7431 if (var_size_in_bytes->is_valid()) { 7432 addq(Address(thread, in_bytes(JavaThread::allocated_bytes_offset())), var_size_in_bytes); 7433 } else { 7434 addq(Address(thread, in_bytes(JavaThread::allocated_bytes_offset())), con_size_in_bytes); 7435 } 7436 #else 7437 if (!thread->is_valid()) { 7438 assert(t1->is_valid(), "need temp reg"); 7439 thread = t1; 7440 get_thread(thread); 7441 } 7442 7443 if (var_size_in_bytes->is_valid()) { 7444 addl(Address(thread, in_bytes(JavaThread::allocated_bytes_offset())), var_size_in_bytes); 7445 } else { 7446 addl(Address(thread, in_bytes(JavaThread::allocated_bytes_offset())), con_size_in_bytes); 7447 } 7448 adcl(Address(thread, in_bytes(JavaThread::allocated_bytes_offset())+4), 0); 7449 #endif 7450 } 7451 7452 static const double pi_4 = 0.7853981633974483; 7453 7454 void MacroAssembler::trigfunc(char trig, int num_fpu_regs_in_use) { 7455 // A hand-coded argument reduction for values in fabs(pi/4, pi/2) 7456 // was attempted in this code; unfortunately it appears that the 7457 // switch to 80-bit precision and back causes this to be 7458 // unprofitable compared with simply performing a runtime call if 7459 // the argument is out of the (-pi/4, pi/4) range. 7460 7461 Register tmp = noreg; 7462 if (!VM_Version::supports_cmov()) { 7463 // fcmp needs a temporary so preserve rbx, 7464 tmp = rbx; 7465 push(tmp); 7466 } 7467 7468 Label slow_case, done; 7469 7470 ExternalAddress pi4_adr = (address)&pi_4; 7471 if (reachable(pi4_adr)) { 7472 // x ?<= pi/4 7473 fld_d(pi4_adr); 7474 fld_s(1); // Stack: X PI/4 X 7475 fabs(); // Stack: |X| PI/4 X 7476 fcmp(tmp); 7477 jcc(Assembler::above, slow_case); 7478 7479 // fastest case: -pi/4 <= x <= pi/4 7480 switch(trig) { 7481 case 's': 7482 fsin(); 7483 break; 7484 case 'c': 7485 fcos(); 7486 break; 7487 case 't': 7488 ftan(); 7489 break; 7490 default: 7491 assert(false, "bad intrinsic"); 7492 break; 7493 } 7494 jmp(done); 7495 } 7496 7497 // slow case: runtime call 7498 bind(slow_case); 7499 // Preserve registers across runtime call 7500 pusha(); 7501 int incoming_argument_and_return_value_offset = -1; 7502 if (num_fpu_regs_in_use > 1) { 7503 // Must preserve all other FPU regs (could alternatively convert 7504 // SharedRuntime::dsin and dcos into assembly routines known not to trash 7505 // FPU state, but can not trust C compiler) 7506 NEEDS_CLEANUP; 7507 // NOTE that in this case we also push the incoming argument to 7508 // the stack and restore it later; we also use this stack slot to 7509 // hold the return value from dsin or dcos. 7510 for (int i = 0; i < num_fpu_regs_in_use; i++) { 7511 subptr(rsp, sizeof(jdouble)); 7512 fstp_d(Address(rsp, 0)); 7513 } 7514 incoming_argument_and_return_value_offset = sizeof(jdouble)*(num_fpu_regs_in_use-1); 7515 fld_d(Address(rsp, incoming_argument_and_return_value_offset)); 7516 } 7517 subptr(rsp, sizeof(jdouble)); 7518 fstp_d(Address(rsp, 0)); 7519 #ifdef _LP64 7520 movdbl(xmm0, Address(rsp, 0)); 7521 #endif // _LP64 7522 7523 // NOTE: we must not use call_VM_leaf here because that requires a 7524 // complete interpreter frame in debug mode -- same bug as 4387334 7525 // MacroAssembler::call_VM_leaf_base is perfectly safe and will 7526 // do proper 64bit abi 7527 7528 NEEDS_CLEANUP; 7529 // Need to add stack banging before this runtime call if it needs to 7530 // be taken; however, there is no generic stack banging routine at 7531 // the MacroAssembler level 7532 switch(trig) { 7533 case 's': 7534 { 7535 MacroAssembler::call_VM_leaf_base(CAST_FROM_FN_PTR(address, SharedRuntime::dsin), 0); 7536 } 7537 break; 7538 case 'c': 7539 { 7540 MacroAssembler::call_VM_leaf_base(CAST_FROM_FN_PTR(address, SharedRuntime::dcos), 0); 7541 } 7542 break; 7543 case 't': 7544 { 7545 MacroAssembler::call_VM_leaf_base(CAST_FROM_FN_PTR(address, SharedRuntime::dtan), 0); 7546 } 7547 break; 7548 default: 7549 assert(false, "bad intrinsic"); 7550 break; 7551 } 7552 #ifdef _LP64 7553 movsd(Address(rsp, 0), xmm0); 7554 fld_d(Address(rsp, 0)); 7555 #endif // _LP64 7556 addptr(rsp, sizeof(jdouble)); 7557 if (num_fpu_regs_in_use > 1) { 7558 // Must save return value to stack and then restore entire FPU stack 7559 fstp_d(Address(rsp, incoming_argument_and_return_value_offset)); 7560 for (int i = 0; i < num_fpu_regs_in_use; i++) { 7561 fld_d(Address(rsp, 0)); 7562 addptr(rsp, sizeof(jdouble)); 7563 } 7564 } 7565 popa(); 7566 7567 // Come here with result in F-TOS 7568 bind(done); 7569 7570 if (tmp != noreg) { 7571 pop(tmp); 7572 } 7573 } 7574 7575 7576 // Look up the method for a megamorphic invokeinterface call. 7577 // The target method is determined by <intf_klass, itable_index>. 7578 // The receiver klass is in recv_klass. 7579 // On success, the result will be in method_result, and execution falls through. 7580 // On failure, execution transfers to the given label. 7581 void MacroAssembler::lookup_interface_method(Register recv_klass, 7582 Register intf_klass, 7583 RegisterOrConstant itable_index, 7584 Register method_result, 7585 Register scan_temp, 7586 Label& L_no_such_interface) { 7587 assert_different_registers(recv_klass, intf_klass, method_result, scan_temp); 7588 assert(itable_index.is_constant() || itable_index.as_register() == method_result, 7589 "caller must use same register for non-constant itable index as for method"); 7590 7591 // Compute start of first itableOffsetEntry (which is at the end of the vtable) 7592 int vtable_base = instanceKlass::vtable_start_offset() * wordSize; 7593 int itentry_off = itableMethodEntry::method_offset_in_bytes(); 7594 int scan_step = itableOffsetEntry::size() * wordSize; 7595 int vte_size = vtableEntry::size() * wordSize; 7596 Address::ScaleFactor times_vte_scale = Address::times_ptr; 7597 assert(vte_size == wordSize, "else adjust times_vte_scale"); 7598 7599 movl(scan_temp, Address(recv_klass, instanceKlass::vtable_length_offset() * wordSize)); 7600 7601 // %%% Could store the aligned, prescaled offset in the klassoop. 7602 lea(scan_temp, Address(recv_klass, scan_temp, times_vte_scale, vtable_base)); 7603 if (HeapWordsPerLong > 1) { 7604 // Round up to align_object_offset boundary 7605 // see code for instanceKlass::start_of_itable! 7606 round_to(scan_temp, BytesPerLong); 7607 } 7608 7609 // Adjust recv_klass by scaled itable_index, so we can free itable_index. 7610 assert(itableMethodEntry::size() * wordSize == wordSize, "adjust the scaling in the code below"); 7611 lea(recv_klass, Address(recv_klass, itable_index, Address::times_ptr, itentry_off)); 7612 7613 // for (scan = klass->itable(); scan->interface() != NULL; scan += scan_step) { 7614 // if (scan->interface() == intf) { 7615 // result = (klass + scan->offset() + itable_index); 7616 // } 7617 // } 7618 Label search, found_method; 7619 7620 for (int peel = 1; peel >= 0; peel--) { 7621 movptr(method_result, Address(scan_temp, itableOffsetEntry::interface_offset_in_bytes())); 7622 cmpptr(intf_klass, method_result); 7623 7624 if (peel) { 7625 jccb(Assembler::equal, found_method); 7626 } else { 7627 jccb(Assembler::notEqual, search); 7628 // (invert the test to fall through to found_method...) 7629 } 7630 7631 if (!peel) break; 7632 7633 bind(search); 7634 7635 // Check that the previous entry is non-null. A null entry means that 7636 // the receiver class doesn't implement the interface, and wasn't the 7637 // same as when the caller was compiled. 7638 testptr(method_result, method_result); 7639 jcc(Assembler::zero, L_no_such_interface); 7640 addptr(scan_temp, scan_step); 7641 } 7642 7643 bind(found_method); 7644 7645 // Got a hit. 7646 movl(scan_temp, Address(scan_temp, itableOffsetEntry::offset_offset_in_bytes())); 7647 movptr(method_result, Address(recv_klass, scan_temp, Address::times_1)); 7648 } 7649 7650 7651 void MacroAssembler::check_klass_subtype(Register sub_klass, 7652 Register super_klass, 7653 Register temp_reg, 7654 Label& L_success) { 7655 Label L_failure; 7656 check_klass_subtype_fast_path(sub_klass, super_klass, temp_reg, &L_success, &L_failure, NULL); 7657 check_klass_subtype_slow_path(sub_klass, super_klass, temp_reg, noreg, &L_success, NULL); 7658 bind(L_failure); 7659 } 7660 7661 7662 void MacroAssembler::check_klass_subtype_fast_path(Register sub_klass, 7663 Register super_klass, 7664 Register temp_reg, 7665 Label* L_success, 7666 Label* L_failure, 7667 Label* L_slow_path, 7668 RegisterOrConstant super_check_offset) { 7669 assert_different_registers(sub_klass, super_klass, temp_reg); 7670 bool must_load_sco = (super_check_offset.constant_or_zero() == -1); 7671 if (super_check_offset.is_register()) { 7672 assert_different_registers(sub_klass, super_klass, 7673 super_check_offset.as_register()); 7674 } else if (must_load_sco) { 7675 assert(temp_reg != noreg, "supply either a temp or a register offset"); 7676 } 7677 7678 Label L_fallthrough; 7679 int label_nulls = 0; 7680 if (L_success == NULL) { L_success = &L_fallthrough; label_nulls++; } 7681 if (L_failure == NULL) { L_failure = &L_fallthrough; label_nulls++; } 7682 if (L_slow_path == NULL) { L_slow_path = &L_fallthrough; label_nulls++; } 7683 assert(label_nulls <= 1, "at most one NULL in the batch"); 7684 7685 int sc_offset = (klassOopDesc::header_size() * HeapWordSize + 7686 Klass::secondary_super_cache_offset_in_bytes()); 7687 int sco_offset = (klassOopDesc::header_size() * HeapWordSize + 7688 Klass::super_check_offset_offset_in_bytes()); 7689 Address super_check_offset_addr(super_klass, sco_offset); 7690 7691 // Hacked jcc, which "knows" that L_fallthrough, at least, is in 7692 // range of a jccb. If this routine grows larger, reconsider at 7693 // least some of these. 7694 #define local_jcc(assembler_cond, label) \ 7695 if (&(label) == &L_fallthrough) jccb(assembler_cond, label); \ 7696 else jcc( assembler_cond, label) /*omit semi*/ 7697 7698 // Hacked jmp, which may only be used just before L_fallthrough. 7699 #define final_jmp(label) \ 7700 if (&(label) == &L_fallthrough) { /*do nothing*/ } \ 7701 else jmp(label) /*omit semi*/ 7702 7703 // If the pointers are equal, we are done (e.g., String[] elements). 7704 // This self-check enables sharing of secondary supertype arrays among 7705 // non-primary types such as array-of-interface. Otherwise, each such 7706 // type would need its own customized SSA. 7707 // We move this check to the front of the fast path because many 7708 // type checks are in fact trivially successful in this manner, 7709 // so we get a nicely predicted branch right at the start of the check. 7710 cmpptr(sub_klass, super_klass); 7711 local_jcc(Assembler::equal, *L_success); 7712 7713 // Check the supertype display: 7714 if (must_load_sco) { 7715 // Positive movl does right thing on LP64. 7716 movl(temp_reg, super_check_offset_addr); 7717 super_check_offset = RegisterOrConstant(temp_reg); 7718 } 7719 Address super_check_addr(sub_klass, super_check_offset, Address::times_1, 0); 7720 cmpptr(super_klass, super_check_addr); // load displayed supertype 7721 7722 // This check has worked decisively for primary supers. 7723 // Secondary supers are sought in the super_cache ('super_cache_addr'). 7724 // (Secondary supers are interfaces and very deeply nested subtypes.) 7725 // This works in the same check above because of a tricky aliasing 7726 // between the super_cache and the primary super display elements. 7727 // (The 'super_check_addr' can address either, as the case requires.) 7728 // Note that the cache is updated below if it does not help us find 7729 // what we need immediately. 7730 // So if it was a primary super, we can just fail immediately. 7731 // Otherwise, it's the slow path for us (no success at this point). 7732 7733 if (super_check_offset.is_register()) { 7734 local_jcc(Assembler::equal, *L_success); 7735 cmpl(super_check_offset.as_register(), sc_offset); 7736 if (L_failure == &L_fallthrough) { 7737 local_jcc(Assembler::equal, *L_slow_path); 7738 } else { 7739 local_jcc(Assembler::notEqual, *L_failure); 7740 final_jmp(*L_slow_path); 7741 } 7742 } else if (super_check_offset.as_constant() == sc_offset) { 7743 // Need a slow path; fast failure is impossible. 7744 if (L_slow_path == &L_fallthrough) { 7745 local_jcc(Assembler::equal, *L_success); 7746 } else { 7747 local_jcc(Assembler::notEqual, *L_slow_path); 7748 final_jmp(*L_success); 7749 } 7750 } else { 7751 // No slow path; it's a fast decision. 7752 if (L_failure == &L_fallthrough) { 7753 local_jcc(Assembler::equal, *L_success); 7754 } else { 7755 local_jcc(Assembler::notEqual, *L_failure); 7756 final_jmp(*L_success); 7757 } 7758 } 7759 7760 bind(L_fallthrough); 7761 7762 #undef local_jcc 7763 #undef final_jmp 7764 } 7765 7766 7767 void MacroAssembler::check_klass_subtype_slow_path(Register sub_klass, 7768 Register super_klass, 7769 Register temp_reg, 7770 Register temp2_reg, 7771 Label* L_success, 7772 Label* L_failure, 7773 bool set_cond_codes) { 7774 assert_different_registers(sub_klass, super_klass, temp_reg); 7775 if (temp2_reg != noreg) 7776 assert_different_registers(sub_klass, super_klass, temp_reg, temp2_reg); 7777 #define IS_A_TEMP(reg) ((reg) == temp_reg || (reg) == temp2_reg) 7778 7779 Label L_fallthrough; 7780 int label_nulls = 0; 7781 if (L_success == NULL) { L_success = &L_fallthrough; label_nulls++; } 7782 if (L_failure == NULL) { L_failure = &L_fallthrough; label_nulls++; } 7783 assert(label_nulls <= 1, "at most one NULL in the batch"); 7784 7785 // a couple of useful fields in sub_klass: 7786 int ss_offset = (klassOopDesc::header_size() * HeapWordSize + 7787 Klass::secondary_supers_offset_in_bytes()); 7788 int sc_offset = (klassOopDesc::header_size() * HeapWordSize + 7789 Klass::secondary_super_cache_offset_in_bytes()); 7790 Address secondary_supers_addr(sub_klass, ss_offset); 7791 Address super_cache_addr( sub_klass, sc_offset); 7792 7793 // Do a linear scan of the secondary super-klass chain. 7794 // This code is rarely used, so simplicity is a virtue here. 7795 // The repne_scan instruction uses fixed registers, which we must spill. 7796 // Don't worry too much about pre-existing connections with the input regs. 7797 7798 assert(sub_klass != rax, "killed reg"); // killed by mov(rax, super) 7799 assert(sub_klass != rcx, "killed reg"); // killed by lea(rcx, &pst_counter) 7800 7801 // Get super_klass value into rax (even if it was in rdi or rcx). 7802 bool pushed_rax = false, pushed_rcx = false, pushed_rdi = false; 7803 if (super_klass != rax || UseCompressedOops) { 7804 if (!IS_A_TEMP(rax)) { push(rax); pushed_rax = true; } 7805 mov(rax, super_klass); 7806 } 7807 if (!IS_A_TEMP(rcx)) { push(rcx); pushed_rcx = true; } 7808 if (!IS_A_TEMP(rdi)) { push(rdi); pushed_rdi = true; } 7809 7810 #ifndef PRODUCT 7811 int* pst_counter = &SharedRuntime::_partial_subtype_ctr; 7812 ExternalAddress pst_counter_addr((address) pst_counter); 7813 NOT_LP64( incrementl(pst_counter_addr) ); 7814 LP64_ONLY( lea(rcx, pst_counter_addr) ); 7815 LP64_ONLY( incrementl(Address(rcx, 0)) ); 7816 #endif //PRODUCT 7817 7818 // We will consult the secondary-super array. 7819 movptr(rdi, secondary_supers_addr); 7820 // Load the array length. (Positive movl does right thing on LP64.) 7821 movl(rcx, Address(rdi, arrayOopDesc::length_offset_in_bytes())); 7822 // Skip to start of data. 7823 addptr(rdi, arrayOopDesc::base_offset_in_bytes(T_OBJECT)); 7824 7825 // Scan RCX words at [RDI] for an occurrence of RAX. 7826 // Set NZ/Z based on last compare. 7827 // Z flag value will not be set by 'repne' if RCX == 0 since 'repne' does 7828 // not change flags (only scas instruction which is repeated sets flags). 7829 // Set Z = 0 (not equal) before 'repne' to indicate that class was not found. 7830 #ifdef _LP64 7831 // This part is tricky, as values in supers array could be 32 or 64 bit wide 7832 // and we store values in objArrays always encoded, thus we need to encode 7833 // the value of rax before repne. Note that rax is dead after the repne. 7834 if (UseCompressedOops) { 7835 encode_heap_oop_not_null(rax); // Changes flags. 7836 // The superclass is never null; it would be a basic system error if a null 7837 // pointer were to sneak in here. Note that we have already loaded the 7838 // Klass::super_check_offset from the super_klass in the fast path, 7839 // so if there is a null in that register, we are already in the afterlife. 7840 testl(rax,rax); // Set Z = 0 7841 repne_scanl(); 7842 } else 7843 #endif // _LP64 7844 { 7845 testptr(rax,rax); // Set Z = 0 7846 repne_scan(); 7847 } 7848 // Unspill the temp. registers: 7849 if (pushed_rdi) pop(rdi); 7850 if (pushed_rcx) pop(rcx); 7851 if (pushed_rax) pop(rax); 7852 7853 if (set_cond_codes) { 7854 // Special hack for the AD files: rdi is guaranteed non-zero. 7855 assert(!pushed_rdi, "rdi must be left non-NULL"); 7856 // Also, the condition codes are properly set Z/NZ on succeed/failure. 7857 } 7858 7859 if (L_failure == &L_fallthrough) 7860 jccb(Assembler::notEqual, *L_failure); 7861 else jcc(Assembler::notEqual, *L_failure); 7862 7863 // Success. Cache the super we found and proceed in triumph. 7864 movptr(super_cache_addr, super_klass); 7865 7866 if (L_success != &L_fallthrough) { 7867 jmp(*L_success); 7868 } 7869 7870 #undef IS_A_TEMP 7871 7872 bind(L_fallthrough); 7873 } 7874 7875 7876 void MacroAssembler::ucomisd(XMMRegister dst, AddressLiteral src) { 7877 ucomisd(dst, as_Address(src)); 7878 } 7879 7880 void MacroAssembler::ucomiss(XMMRegister dst, AddressLiteral src) { 7881 ucomiss(dst, as_Address(src)); 7882 } 7883 7884 void MacroAssembler::xorpd(XMMRegister dst, AddressLiteral src) { 7885 if (reachable(src)) { 7886 xorpd(dst, as_Address(src)); 7887 } else { 7888 lea(rscratch1, src); 7889 xorpd(dst, Address(rscratch1, 0)); 7890 } 7891 } 7892 7893 void MacroAssembler::xorps(XMMRegister dst, AddressLiteral src) { 7894 if (reachable(src)) { 7895 xorps(dst, as_Address(src)); 7896 } else { 7897 lea(rscratch1, src); 7898 xorps(dst, Address(rscratch1, 0)); 7899 } 7900 } 7901 7902 void MacroAssembler::cmov32(Condition cc, Register dst, Address src) { 7903 if (VM_Version::supports_cmov()) { 7904 cmovl(cc, dst, src); 7905 } else { 7906 Label L; 7907 jccb(negate_condition(cc), L); 7908 movl(dst, src); 7909 bind(L); 7910 } 7911 } 7912 7913 void MacroAssembler::cmov32(Condition cc, Register dst, Register src) { 7914 if (VM_Version::supports_cmov()) { 7915 cmovl(cc, dst, src); 7916 } else { 7917 Label L; 7918 jccb(negate_condition(cc), L); 7919 movl(dst, src); 7920 bind(L); 7921 } 7922 } 7923 7924 void MacroAssembler::verify_oop(Register reg, const char* s) { 7925 if (!VerifyOops) return; 7926 7927 // Pass register number to verify_oop_subroutine 7928 char* b = new char[strlen(s) + 50]; 7929 sprintf(b, "verify_oop: %s: %s", reg->name(), s); 7930 #ifdef _LP64 7931 push(rscratch1); // save r10, trashed by movptr() 7932 #endif 7933 push(rax); // save rax, 7934 push(reg); // pass register argument 7935 ExternalAddress buffer((address) b); 7936 // avoid using pushptr, as it modifies scratch registers 7937 // and our contract is not to modify anything 7938 movptr(rax, buffer.addr()); 7939 push(rax); 7940 // call indirectly to solve generation ordering problem 7941 movptr(rax, ExternalAddress(StubRoutines::verify_oop_subroutine_entry_address())); 7942 call(rax); 7943 // Caller pops the arguments (oop, message) and restores rax, r10 7944 } 7945 7946 7947 RegisterOrConstant MacroAssembler::delayed_value_impl(intptr_t* delayed_value_addr, 7948 Register tmp, 7949 int offset) { 7950 intptr_t value = *delayed_value_addr; 7951 if (value != 0) 7952 return RegisterOrConstant(value + offset); 7953 7954 // load indirectly to solve generation ordering problem 7955 movptr(tmp, ExternalAddress((address) delayed_value_addr)); 7956 7957 #ifdef ASSERT 7958 { Label L; 7959 testptr(tmp, tmp); 7960 if (WizardMode) { 7961 jcc(Assembler::notZero, L); 7962 char* buf = new char[40]; 7963 sprintf(buf, "DelayedValue="INTPTR_FORMAT, delayed_value_addr[1]); 7964 stop(buf); 7965 } else { 7966 jccb(Assembler::notZero, L); 7967 hlt(); 7968 } 7969 bind(L); 7970 } 7971 #endif 7972 7973 if (offset != 0) 7974 addptr(tmp, offset); 7975 7976 return RegisterOrConstant(tmp); 7977 } 7978 7979 7980 // registers on entry: 7981 // - rax ('check' register): required MethodType 7982 // - rcx: method handle 7983 // - rdx, rsi, or ?: killable temp 7984 void MacroAssembler::check_method_handle_type(Register mtype_reg, Register mh_reg, 7985 Register temp_reg, 7986 Label& wrong_method_type) { 7987 Address type_addr(mh_reg, delayed_value(java_lang_invoke_MethodHandle::type_offset_in_bytes, temp_reg)); 7988 // compare method type against that of the receiver 7989 if (UseCompressedOops) { 7990 load_heap_oop(temp_reg, type_addr); 7991 cmpptr(mtype_reg, temp_reg); 7992 } else { 7993 cmpptr(mtype_reg, type_addr); 7994 } 7995 jcc(Assembler::notEqual, wrong_method_type); 7996 } 7997 7998 7999 // A method handle has a "vmslots" field which gives the size of its 8000 // argument list in JVM stack slots. This field is either located directly 8001 // in every method handle, or else is indirectly accessed through the 8002 // method handle's MethodType. This macro hides the distinction. 8003 void MacroAssembler::load_method_handle_vmslots(Register vmslots_reg, Register mh_reg, 8004 Register temp_reg) { 8005 assert_different_registers(vmslots_reg, mh_reg, temp_reg); 8006 // load mh.type.form.vmslots 8007 if (java_lang_invoke_MethodHandle::vmslots_offset_in_bytes() != 0) { 8008 // hoist vmslots into every mh to avoid dependent load chain 8009 movl(vmslots_reg, Address(mh_reg, delayed_value(java_lang_invoke_MethodHandle::vmslots_offset_in_bytes, temp_reg))); 8010 } else { 8011 Register temp2_reg = vmslots_reg; 8012 load_heap_oop(temp2_reg, Address(mh_reg, delayed_value(java_lang_invoke_MethodHandle::type_offset_in_bytes, temp_reg))); 8013 load_heap_oop(temp2_reg, Address(temp2_reg, delayed_value(java_lang_invoke_MethodType::form_offset_in_bytes, temp_reg))); 8014 movl(vmslots_reg, Address(temp2_reg, delayed_value(java_lang_invoke_MethodTypeForm::vmslots_offset_in_bytes, temp_reg))); 8015 } 8016 } 8017 8018 8019 // registers on entry: 8020 // - rcx: method handle 8021 // - rdx: killable temp (interpreted only) 8022 // - rax: killable temp (compiled only) 8023 void MacroAssembler::jump_to_method_handle_entry(Register mh_reg, Register temp_reg) { 8024 assert(mh_reg == rcx, "caller must put MH object in rcx"); 8025 assert_different_registers(mh_reg, temp_reg); 8026 8027 // pick out the interpreted side of the handler 8028 // NOTE: vmentry is not an oop! 8029 movptr(temp_reg, Address(mh_reg, delayed_value(java_lang_invoke_MethodHandle::vmentry_offset_in_bytes, temp_reg))); 8030 8031 // off we go... 8032 jmp(Address(temp_reg, MethodHandleEntry::from_interpreted_entry_offset_in_bytes())); 8033 8034 // for the various stubs which take control at this point, 8035 // see MethodHandles::generate_method_handle_stub 8036 } 8037 8038 8039 Address MacroAssembler::argument_address(RegisterOrConstant arg_slot, 8040 int extra_slot_offset) { 8041 // cf. TemplateTable::prepare_invoke(), if (load_receiver). 8042 int stackElementSize = Interpreter::stackElementSize; 8043 int offset = Interpreter::expr_offset_in_bytes(extra_slot_offset+0); 8044 #ifdef ASSERT 8045 int offset1 = Interpreter::expr_offset_in_bytes(extra_slot_offset+1); 8046 assert(offset1 - offset == stackElementSize, "correct arithmetic"); 8047 #endif 8048 Register scale_reg = noreg; 8049 Address::ScaleFactor scale_factor = Address::no_scale; 8050 if (arg_slot.is_constant()) { 8051 offset += arg_slot.as_constant() * stackElementSize; 8052 } else { 8053 scale_reg = arg_slot.as_register(); 8054 scale_factor = Address::times(stackElementSize); 8055 } 8056 offset += wordSize; // return PC is on stack 8057 return Address(rsp, scale_reg, scale_factor, offset); 8058 } 8059 8060 8061 void MacroAssembler::verify_oop_addr(Address addr, const char* s) { 8062 if (!VerifyOops) return; 8063 8064 // Address adjust(addr.base(), addr.index(), addr.scale(), addr.disp() + BytesPerWord); 8065 // Pass register number to verify_oop_subroutine 8066 char* b = new char[strlen(s) + 50]; 8067 sprintf(b, "verify_oop_addr: %s", s); 8068 8069 #ifdef _LP64 8070 push(rscratch1); // save r10, trashed by movptr() 8071 #endif 8072 push(rax); // save rax, 8073 // addr may contain rsp so we will have to adjust it based on the push 8074 // we just did (and on 64 bit we do two pushes) 8075 // NOTE: 64bit seemed to have had a bug in that it did movq(addr, rax); which 8076 // stores rax into addr which is backwards of what was intended. 8077 if (addr.uses(rsp)) { 8078 lea(rax, addr); 8079 pushptr(Address(rax, LP64_ONLY(2 *) BytesPerWord)); 8080 } else { 8081 pushptr(addr); 8082 } 8083 8084 ExternalAddress buffer((address) b); 8085 // pass msg argument 8086 // avoid using pushptr, as it modifies scratch registers 8087 // and our contract is not to modify anything 8088 movptr(rax, buffer.addr()); 8089 push(rax); 8090 8091 // call indirectly to solve generation ordering problem 8092 movptr(rax, ExternalAddress(StubRoutines::verify_oop_subroutine_entry_address())); 8093 call(rax); 8094 // Caller pops the arguments (addr, message) and restores rax, r10. 8095 } 8096 8097 void MacroAssembler::verify_tlab() { 8098 #ifdef ASSERT 8099 if (UseTLAB && VerifyOops) { 8100 Label next, ok; 8101 Register t1 = rsi; 8102 Register thread_reg = NOT_LP64(rbx) LP64_ONLY(r15_thread); 8103 8104 push(t1); 8105 NOT_LP64(push(thread_reg)); 8106 NOT_LP64(get_thread(thread_reg)); 8107 8108 movptr(t1, Address(thread_reg, in_bytes(JavaThread::tlab_top_offset()))); 8109 cmpptr(t1, Address(thread_reg, in_bytes(JavaThread::tlab_start_offset()))); 8110 jcc(Assembler::aboveEqual, next); 8111 stop("assert(top >= start)"); 8112 should_not_reach_here(); 8113 8114 bind(next); 8115 movptr(t1, Address(thread_reg, in_bytes(JavaThread::tlab_end_offset()))); 8116 cmpptr(t1, Address(thread_reg, in_bytes(JavaThread::tlab_top_offset()))); 8117 jcc(Assembler::aboveEqual, ok); 8118 stop("assert(top <= end)"); 8119 should_not_reach_here(); 8120 8121 bind(ok); 8122 NOT_LP64(pop(thread_reg)); 8123 pop(t1); 8124 } 8125 #endif 8126 } 8127 8128 class ControlWord { 8129 public: 8130 int32_t _value; 8131 8132 int rounding_control() const { return (_value >> 10) & 3 ; } 8133 int precision_control() const { return (_value >> 8) & 3 ; } 8134 bool precision() const { return ((_value >> 5) & 1) != 0; } 8135 bool underflow() const { return ((_value >> 4) & 1) != 0; } 8136 bool overflow() const { return ((_value >> 3) & 1) != 0; } 8137 bool zero_divide() const { return ((_value >> 2) & 1) != 0; } 8138 bool denormalized() const { return ((_value >> 1) & 1) != 0; } 8139 bool invalid() const { return ((_value >> 0) & 1) != 0; } 8140 8141 void print() const { 8142 // rounding control 8143 const char* rc; 8144 switch (rounding_control()) { 8145 case 0: rc = "round near"; break; 8146 case 1: rc = "round down"; break; 8147 case 2: rc = "round up "; break; 8148 case 3: rc = "chop "; break; 8149 }; 8150 // precision control 8151 const char* pc; 8152 switch (precision_control()) { 8153 case 0: pc = "24 bits "; break; 8154 case 1: pc = "reserved"; break; 8155 case 2: pc = "53 bits "; break; 8156 case 3: pc = "64 bits "; break; 8157 }; 8158 // flags 8159 char f[9]; 8160 f[0] = ' '; 8161 f[1] = ' '; 8162 f[2] = (precision ()) ? 'P' : 'p'; 8163 f[3] = (underflow ()) ? 'U' : 'u'; 8164 f[4] = (overflow ()) ? 'O' : 'o'; 8165 f[5] = (zero_divide ()) ? 'Z' : 'z'; 8166 f[6] = (denormalized()) ? 'D' : 'd'; 8167 f[7] = (invalid ()) ? 'I' : 'i'; 8168 f[8] = '\x0'; 8169 // output 8170 printf("%04x masks = %s, %s, %s", _value & 0xFFFF, f, rc, pc); 8171 } 8172 8173 }; 8174 8175 class StatusWord { 8176 public: 8177 int32_t _value; 8178 8179 bool busy() const { return ((_value >> 15) & 1) != 0; } 8180 bool C3() const { return ((_value >> 14) & 1) != 0; } 8181 bool C2() const { return ((_value >> 10) & 1) != 0; } 8182 bool C1() const { return ((_value >> 9) & 1) != 0; } 8183 bool C0() const { return ((_value >> 8) & 1) != 0; } 8184 int top() const { return (_value >> 11) & 7 ; } 8185 bool error_status() const { return ((_value >> 7) & 1) != 0; } 8186 bool stack_fault() const { return ((_value >> 6) & 1) != 0; } 8187 bool precision() const { return ((_value >> 5) & 1) != 0; } 8188 bool underflow() const { return ((_value >> 4) & 1) != 0; } 8189 bool overflow() const { return ((_value >> 3) & 1) != 0; } 8190 bool zero_divide() const { return ((_value >> 2) & 1) != 0; } 8191 bool denormalized() const { return ((_value >> 1) & 1) != 0; } 8192 bool invalid() const { return ((_value >> 0) & 1) != 0; } 8193 8194 void print() const { 8195 // condition codes 8196 char c[5]; 8197 c[0] = (C3()) ? '3' : '-'; 8198 c[1] = (C2()) ? '2' : '-'; 8199 c[2] = (C1()) ? '1' : '-'; 8200 c[3] = (C0()) ? '0' : '-'; 8201 c[4] = '\x0'; 8202 // flags 8203 char f[9]; 8204 f[0] = (error_status()) ? 'E' : '-'; 8205 f[1] = (stack_fault ()) ? 'S' : '-'; 8206 f[2] = (precision ()) ? 'P' : '-'; 8207 f[3] = (underflow ()) ? 'U' : '-'; 8208 f[4] = (overflow ()) ? 'O' : '-'; 8209 f[5] = (zero_divide ()) ? 'Z' : '-'; 8210 f[6] = (denormalized()) ? 'D' : '-'; 8211 f[7] = (invalid ()) ? 'I' : '-'; 8212 f[8] = '\x0'; 8213 // output 8214 printf("%04x flags = %s, cc = %s, top = %d", _value & 0xFFFF, f, c, top()); 8215 } 8216 8217 }; 8218 8219 class TagWord { 8220 public: 8221 int32_t _value; 8222 8223 int tag_at(int i) const { return (_value >> (i*2)) & 3; } 8224 8225 void print() const { 8226 printf("%04x", _value & 0xFFFF); 8227 } 8228 8229 }; 8230 8231 class FPU_Register { 8232 public: 8233 int32_t _m0; 8234 int32_t _m1; 8235 int16_t _ex; 8236 8237 bool is_indefinite() const { 8238 return _ex == -1 && _m1 == (int32_t)0xC0000000 && _m0 == 0; 8239 } 8240 8241 void print() const { 8242 char sign = (_ex < 0) ? '-' : '+'; 8243 const char* kind = (_ex == 0x7FFF || _ex == (int16_t)-1) ? "NaN" : " "; 8244 printf("%c%04hx.%08x%08x %s", sign, _ex, _m1, _m0, kind); 8245 }; 8246 8247 }; 8248 8249 class FPU_State { 8250 public: 8251 enum { 8252 register_size = 10, 8253 number_of_registers = 8, 8254 register_mask = 7 8255 }; 8256 8257 ControlWord _control_word; 8258 StatusWord _status_word; 8259 TagWord _tag_word; 8260 int32_t _error_offset; 8261 int32_t _error_selector; 8262 int32_t _data_offset; 8263 int32_t _data_selector; 8264 int8_t _register[register_size * number_of_registers]; 8265 8266 int tag_for_st(int i) const { return _tag_word.tag_at((_status_word.top() + i) & register_mask); } 8267 FPU_Register* st(int i) const { return (FPU_Register*)&_register[register_size * i]; } 8268 8269 const char* tag_as_string(int tag) const { 8270 switch (tag) { 8271 case 0: return "valid"; 8272 case 1: return "zero"; 8273 case 2: return "special"; 8274 case 3: return "empty"; 8275 } 8276 ShouldNotReachHere(); 8277 return NULL; 8278 } 8279 8280 void print() const { 8281 // print computation registers 8282 { int t = _status_word.top(); 8283 for (int i = 0; i < number_of_registers; i++) { 8284 int j = (i - t) & register_mask; 8285 printf("%c r%d = ST%d = ", (j == 0 ? '*' : ' '), i, j); 8286 st(j)->print(); 8287 printf(" %s\n", tag_as_string(_tag_word.tag_at(i))); 8288 } 8289 } 8290 printf("\n"); 8291 // print control registers 8292 printf("ctrl = "); _control_word.print(); printf("\n"); 8293 printf("stat = "); _status_word .print(); printf("\n"); 8294 printf("tags = "); _tag_word .print(); printf("\n"); 8295 } 8296 8297 }; 8298 8299 class Flag_Register { 8300 public: 8301 int32_t _value; 8302 8303 bool overflow() const { return ((_value >> 11) & 1) != 0; } 8304 bool direction() const { return ((_value >> 10) & 1) != 0; } 8305 bool sign() const { return ((_value >> 7) & 1) != 0; } 8306 bool zero() const { return ((_value >> 6) & 1) != 0; } 8307 bool auxiliary_carry() const { return ((_value >> 4) & 1) != 0; } 8308 bool parity() const { return ((_value >> 2) & 1) != 0; } 8309 bool carry() const { return ((_value >> 0) & 1) != 0; } 8310 8311 void print() const { 8312 // flags 8313 char f[8]; 8314 f[0] = (overflow ()) ? 'O' : '-'; 8315 f[1] = (direction ()) ? 'D' : '-'; 8316 f[2] = (sign ()) ? 'S' : '-'; 8317 f[3] = (zero ()) ? 'Z' : '-'; 8318 f[4] = (auxiliary_carry()) ? 'A' : '-'; 8319 f[5] = (parity ()) ? 'P' : '-'; 8320 f[6] = (carry ()) ? 'C' : '-'; 8321 f[7] = '\x0'; 8322 // output 8323 printf("%08x flags = %s", _value, f); 8324 } 8325 8326 }; 8327 8328 class IU_Register { 8329 public: 8330 int32_t _value; 8331 8332 void print() const { 8333 printf("%08x %11d", _value, _value); 8334 } 8335 8336 }; 8337 8338 class IU_State { 8339 public: 8340 Flag_Register _eflags; 8341 IU_Register _rdi; 8342 IU_Register _rsi; 8343 IU_Register _rbp; 8344 IU_Register _rsp; 8345 IU_Register _rbx; 8346 IU_Register _rdx; 8347 IU_Register _rcx; 8348 IU_Register _rax; 8349 8350 void print() const { 8351 // computation registers 8352 printf("rax, = "); _rax.print(); printf("\n"); 8353 printf("rbx, = "); _rbx.print(); printf("\n"); 8354 printf("rcx = "); _rcx.print(); printf("\n"); 8355 printf("rdx = "); _rdx.print(); printf("\n"); 8356 printf("rdi = "); _rdi.print(); printf("\n"); 8357 printf("rsi = "); _rsi.print(); printf("\n"); 8358 printf("rbp, = "); _rbp.print(); printf("\n"); 8359 printf("rsp = "); _rsp.print(); printf("\n"); 8360 printf("\n"); 8361 // control registers 8362 printf("flgs = "); _eflags.print(); printf("\n"); 8363 } 8364 }; 8365 8366 8367 class CPU_State { 8368 public: 8369 FPU_State _fpu_state; 8370 IU_State _iu_state; 8371 8372 void print() const { 8373 printf("--------------------------------------------------\n"); 8374 _iu_state .print(); 8375 printf("\n"); 8376 _fpu_state.print(); 8377 printf("--------------------------------------------------\n"); 8378 } 8379 8380 }; 8381 8382 8383 static void _print_CPU_state(CPU_State* state) { 8384 state->print(); 8385 }; 8386 8387 8388 void MacroAssembler::print_CPU_state() { 8389 push_CPU_state(); 8390 push(rsp); // pass CPU state 8391 call(RuntimeAddress(CAST_FROM_FN_PTR(address, _print_CPU_state))); 8392 addptr(rsp, wordSize); // discard argument 8393 pop_CPU_state(); 8394 } 8395 8396 8397 static bool _verify_FPU(int stack_depth, char* s, CPU_State* state) { 8398 static int counter = 0; 8399 FPU_State* fs = &state->_fpu_state; 8400 counter++; 8401 // For leaf calls, only verify that the top few elements remain empty. 8402 // We only need 1 empty at the top for C2 code. 8403 if( stack_depth < 0 ) { 8404 if( fs->tag_for_st(7) != 3 ) { 8405 printf("FPR7 not empty\n"); 8406 state->print(); 8407 assert(false, "error"); 8408 return false; 8409 } 8410 return true; // All other stack states do not matter 8411 } 8412 8413 assert((fs->_control_word._value & 0xffff) == StubRoutines::_fpu_cntrl_wrd_std, 8414 "bad FPU control word"); 8415 8416 // compute stack depth 8417 int i = 0; 8418 while (i < FPU_State::number_of_registers && fs->tag_for_st(i) < 3) i++; 8419 int d = i; 8420 while (i < FPU_State::number_of_registers && fs->tag_for_st(i) == 3) i++; 8421 // verify findings 8422 if (i != FPU_State::number_of_registers) { 8423 // stack not contiguous 8424 printf("%s: stack not contiguous at ST%d\n", s, i); 8425 state->print(); 8426 assert(false, "error"); 8427 return false; 8428 } 8429 // check if computed stack depth corresponds to expected stack depth 8430 if (stack_depth < 0) { 8431 // expected stack depth is -stack_depth or less 8432 if (d > -stack_depth) { 8433 // too many elements on the stack 8434 printf("%s: <= %d stack elements expected but found %d\n", s, -stack_depth, d); 8435 state->print(); 8436 assert(false, "error"); 8437 return false; 8438 } 8439 } else { 8440 // expected stack depth is stack_depth 8441 if (d != stack_depth) { 8442 // wrong stack depth 8443 printf("%s: %d stack elements expected but found %d\n", s, stack_depth, d); 8444 state->print(); 8445 assert(false, "error"); 8446 return false; 8447 } 8448 } 8449 // everything is cool 8450 return true; 8451 } 8452 8453 8454 void MacroAssembler::verify_FPU(int stack_depth, const char* s) { 8455 if (!VerifyFPU) return; 8456 push_CPU_state(); 8457 push(rsp); // pass CPU state 8458 ExternalAddress msg((address) s); 8459 // pass message string s 8460 pushptr(msg.addr()); 8461 push(stack_depth); // pass stack depth 8462 call(RuntimeAddress(CAST_FROM_FN_PTR(address, _verify_FPU))); 8463 addptr(rsp, 3 * wordSize); // discard arguments 8464 // check for error 8465 { Label L; 8466 testl(rax, rax); 8467 jcc(Assembler::notZero, L); 8468 int3(); // break if error condition 8469 bind(L); 8470 } 8471 pop_CPU_state(); 8472 } 8473 8474 void MacroAssembler::load_klass(Register dst, Register src) { 8475 #ifdef _LP64 8476 if (UseCompressedOops) { 8477 movl(dst, Address(src, oopDesc::klass_offset_in_bytes())); 8478 decode_heap_oop_not_null(dst); 8479 } else 8480 #endif 8481 movptr(dst, Address(src, oopDesc::klass_offset_in_bytes())); 8482 } 8483 8484 void MacroAssembler::load_prototype_header(Register dst, Register src) { 8485 #ifdef _LP64 8486 if (UseCompressedOops) { 8487 assert (Universe::heap() != NULL, "java heap should be initialized"); 8488 movl(dst, Address(src, oopDesc::klass_offset_in_bytes())); 8489 if (Universe::narrow_oop_shift() != 0) { 8490 assert(LogMinObjAlignmentInBytes == Universe::narrow_oop_shift(), "decode alg wrong"); 8491 if (LogMinObjAlignmentInBytes == Address::times_8) { 8492 movq(dst, Address(r12_heapbase, dst, Address::times_8, Klass::prototype_header_offset_in_bytes() + klassOopDesc::klass_part_offset_in_bytes())); 8493 } else { 8494 // OK to use shift since we don't need to preserve flags. 8495 shlq(dst, LogMinObjAlignmentInBytes); 8496 movq(dst, Address(r12_heapbase, dst, Address::times_1, Klass::prototype_header_offset_in_bytes() + klassOopDesc::klass_part_offset_in_bytes())); 8497 } 8498 } else { 8499 movq(dst, Address(dst, Klass::prototype_header_offset_in_bytes() + klassOopDesc::klass_part_offset_in_bytes())); 8500 } 8501 } else 8502 #endif 8503 { 8504 movptr(dst, Address(src, oopDesc::klass_offset_in_bytes())); 8505 movptr(dst, Address(dst, Klass::prototype_header_offset_in_bytes() + klassOopDesc::klass_part_offset_in_bytes())); 8506 } 8507 } 8508 8509 void MacroAssembler::store_klass(Register dst, Register src) { 8510 #ifdef _LP64 8511 if (UseCompressedOops) { 8512 encode_heap_oop_not_null(src); 8513 movl(Address(dst, oopDesc::klass_offset_in_bytes()), src); 8514 } else 8515 #endif 8516 movptr(Address(dst, oopDesc::klass_offset_in_bytes()), src); 8517 } 8518 8519 void MacroAssembler::load_heap_oop(Register dst, Address src) { 8520 #ifdef _LP64 8521 if (UseCompressedOops) { 8522 movl(dst, src); 8523 decode_heap_oop(dst); 8524 } else 8525 #endif 8526 movptr(dst, src); 8527 } 8528 8529 // Doesn't do verfication, generates fixed size code 8530 void MacroAssembler::load_heap_oop_not_null(Register dst, Address src) { 8531 #ifdef _LP64 8532 if (UseCompressedOops) { 8533 movl(dst, src); 8534 decode_heap_oop_not_null(dst); 8535 } else 8536 #endif 8537 movptr(dst, src); 8538 } 8539 8540 void MacroAssembler::store_heap_oop(Address dst, Register src) { 8541 #ifdef _LP64 8542 if (UseCompressedOops) { 8543 assert(!dst.uses(src), "not enough registers"); 8544 encode_heap_oop(src); 8545 movl(dst, src); 8546 } else 8547 #endif 8548 movptr(dst, src); 8549 } 8550 8551 // Used for storing NULLs. 8552 void MacroAssembler::store_heap_oop_null(Address dst) { 8553 #ifdef _LP64 8554 if (UseCompressedOops) { 8555 movl(dst, (int32_t)NULL_WORD); 8556 } else { 8557 movslq(dst, (int32_t)NULL_WORD); 8558 } 8559 #else 8560 movl(dst, (int32_t)NULL_WORD); 8561 #endif 8562 } 8563 8564 #ifdef _LP64 8565 void MacroAssembler::store_klass_gap(Register dst, Register src) { 8566 if (UseCompressedOops) { 8567 // Store to klass gap in destination 8568 movl(Address(dst, oopDesc::klass_gap_offset_in_bytes()), src); 8569 } 8570 } 8571 8572 #ifdef ASSERT 8573 void MacroAssembler::verify_heapbase(const char* msg) { 8574 assert (UseCompressedOops, "should be compressed"); 8575 assert (Universe::heap() != NULL, "java heap should be initialized"); 8576 if (CheckCompressedOops) { 8577 Label ok; 8578 push(rscratch1); // cmpptr trashes rscratch1 8579 cmpptr(r12_heapbase, ExternalAddress((address)Universe::narrow_oop_base_addr())); 8580 jcc(Assembler::equal, ok); 8581 stop(msg); 8582 bind(ok); 8583 pop(rscratch1); 8584 } 8585 } 8586 #endif 8587 8588 // Algorithm must match oop.inline.hpp encode_heap_oop. 8589 void MacroAssembler::encode_heap_oop(Register r) { 8590 #ifdef ASSERT 8591 verify_heapbase("MacroAssembler::encode_heap_oop: heap base corrupted?"); 8592 #endif 8593 verify_oop(r, "broken oop in encode_heap_oop"); 8594 if (Universe::narrow_oop_base() == NULL) { 8595 if (Universe::narrow_oop_shift() != 0) { 8596 assert (LogMinObjAlignmentInBytes == Universe::narrow_oop_shift(), "decode alg wrong"); 8597 shrq(r, LogMinObjAlignmentInBytes); 8598 } 8599 return; 8600 } 8601 testq(r, r); 8602 cmovq(Assembler::equal, r, r12_heapbase); 8603 subq(r, r12_heapbase); 8604 shrq(r, LogMinObjAlignmentInBytes); 8605 } 8606 8607 void MacroAssembler::encode_heap_oop_not_null(Register r) { 8608 #ifdef ASSERT 8609 verify_heapbase("MacroAssembler::encode_heap_oop_not_null: heap base corrupted?"); 8610 if (CheckCompressedOops) { 8611 Label ok; 8612 testq(r, r); 8613 jcc(Assembler::notEqual, ok); 8614 stop("null oop passed to encode_heap_oop_not_null"); 8615 bind(ok); 8616 } 8617 #endif 8618 verify_oop(r, "broken oop in encode_heap_oop_not_null"); 8619 if (Universe::narrow_oop_base() != NULL) { 8620 subq(r, r12_heapbase); 8621 } 8622 if (Universe::narrow_oop_shift() != 0) { 8623 assert (LogMinObjAlignmentInBytes == Universe::narrow_oop_shift(), "decode alg wrong"); 8624 shrq(r, LogMinObjAlignmentInBytes); 8625 } 8626 } 8627 8628 void MacroAssembler::encode_heap_oop_not_null(Register dst, Register src) { 8629 #ifdef ASSERT 8630 verify_heapbase("MacroAssembler::encode_heap_oop_not_null2: heap base corrupted?"); 8631 if (CheckCompressedOops) { 8632 Label ok; 8633 testq(src, src); 8634 jcc(Assembler::notEqual, ok); 8635 stop("null oop passed to encode_heap_oop_not_null2"); 8636 bind(ok); 8637 } 8638 #endif 8639 verify_oop(src, "broken oop in encode_heap_oop_not_null2"); 8640 if (dst != src) { 8641 movq(dst, src); 8642 } 8643 if (Universe::narrow_oop_base() != NULL) { 8644 subq(dst, r12_heapbase); 8645 } 8646 if (Universe::narrow_oop_shift() != 0) { 8647 assert (LogMinObjAlignmentInBytes == Universe::narrow_oop_shift(), "decode alg wrong"); 8648 shrq(dst, LogMinObjAlignmentInBytes); 8649 } 8650 } 8651 8652 void MacroAssembler::decode_heap_oop(Register r) { 8653 #ifdef ASSERT 8654 verify_heapbase("MacroAssembler::decode_heap_oop: heap base corrupted?"); 8655 #endif 8656 if (Universe::narrow_oop_base() == NULL) { 8657 if (Universe::narrow_oop_shift() != 0) { 8658 assert (LogMinObjAlignmentInBytes == Universe::narrow_oop_shift(), "decode alg wrong"); 8659 shlq(r, LogMinObjAlignmentInBytes); 8660 } 8661 } else { 8662 Label done; 8663 shlq(r, LogMinObjAlignmentInBytes); 8664 jccb(Assembler::equal, done); 8665 addq(r, r12_heapbase); 8666 bind(done); 8667 } 8668 verify_oop(r, "broken oop in decode_heap_oop"); 8669 } 8670 8671 void MacroAssembler::decode_heap_oop_not_null(Register r) { 8672 // Note: it will change flags 8673 assert (UseCompressedOops, "should only be used for compressed headers"); 8674 assert (Universe::heap() != NULL, "java heap should be initialized"); 8675 // Cannot assert, unverified entry point counts instructions (see .ad file) 8676 // vtableStubs also counts instructions in pd_code_size_limit. 8677 // Also do not verify_oop as this is called by verify_oop. 8678 if (Universe::narrow_oop_shift() != 0) { 8679 assert(LogMinObjAlignmentInBytes == Universe::narrow_oop_shift(), "decode alg wrong"); 8680 shlq(r, LogMinObjAlignmentInBytes); 8681 if (Universe::narrow_oop_base() != NULL) { 8682 addq(r, r12_heapbase); 8683 } 8684 } else { 8685 assert (Universe::narrow_oop_base() == NULL, "sanity"); 8686 } 8687 } 8688 8689 void MacroAssembler::decode_heap_oop_not_null(Register dst, Register src) { 8690 // Note: it will change flags 8691 assert (UseCompressedOops, "should only be used for compressed headers"); 8692 assert (Universe::heap() != NULL, "java heap should be initialized"); 8693 // Cannot assert, unverified entry point counts instructions (see .ad file) 8694 // vtableStubs also counts instructions in pd_code_size_limit. 8695 // Also do not verify_oop as this is called by verify_oop. 8696 if (Universe::narrow_oop_shift() != 0) { 8697 assert(LogMinObjAlignmentInBytes == Universe::narrow_oop_shift(), "decode alg wrong"); 8698 if (LogMinObjAlignmentInBytes == Address::times_8) { 8699 leaq(dst, Address(r12_heapbase, src, Address::times_8, 0)); 8700 } else { 8701 if (dst != src) { 8702 movq(dst, src); 8703 } 8704 shlq(dst, LogMinObjAlignmentInBytes); 8705 if (Universe::narrow_oop_base() != NULL) { 8706 addq(dst, r12_heapbase); 8707 } 8708 } 8709 } else { 8710 assert (Universe::narrow_oop_base() == NULL, "sanity"); 8711 if (dst != src) { 8712 movq(dst, src); 8713 } 8714 } 8715 } 8716 8717 void MacroAssembler::set_narrow_oop(Register dst, jobject obj) { 8718 assert (UseCompressedOops, "should only be used for compressed headers"); 8719 assert (Universe::heap() != NULL, "java heap should be initialized"); 8720 assert (oop_recorder() != NULL, "this assembler needs an OopRecorder"); 8721 int oop_index = oop_recorder()->find_index(obj); 8722 RelocationHolder rspec = oop_Relocation::spec(oop_index); 8723 mov_narrow_oop(dst, oop_index, rspec); 8724 } 8725 8726 void MacroAssembler::set_narrow_oop(Address dst, jobject obj) { 8727 assert (UseCompressedOops, "should only be used for compressed headers"); 8728 assert (Universe::heap() != NULL, "java heap should be initialized"); 8729 assert (oop_recorder() != NULL, "this assembler needs an OopRecorder"); 8730 int oop_index = oop_recorder()->find_index(obj); 8731 RelocationHolder rspec = oop_Relocation::spec(oop_index); 8732 mov_narrow_oop(dst, oop_index, rspec); 8733 } 8734 8735 void MacroAssembler::cmp_narrow_oop(Register dst, jobject obj) { 8736 assert (UseCompressedOops, "should only be used for compressed headers"); 8737 assert (Universe::heap() != NULL, "java heap should be initialized"); 8738 assert (oop_recorder() != NULL, "this assembler needs an OopRecorder"); 8739 int oop_index = oop_recorder()->find_index(obj); 8740 RelocationHolder rspec = oop_Relocation::spec(oop_index); 8741 Assembler::cmp_narrow_oop(dst, oop_index, rspec); 8742 } 8743 8744 void MacroAssembler::cmp_narrow_oop(Address dst, jobject obj) { 8745 assert (UseCompressedOops, "should only be used for compressed headers"); 8746 assert (Universe::heap() != NULL, "java heap should be initialized"); 8747 assert (oop_recorder() != NULL, "this assembler needs an OopRecorder"); 8748 int oop_index = oop_recorder()->find_index(obj); 8749 RelocationHolder rspec = oop_Relocation::spec(oop_index); 8750 Assembler::cmp_narrow_oop(dst, oop_index, rspec); 8751 } 8752 8753 void MacroAssembler::reinit_heapbase() { 8754 if (UseCompressedOops) { 8755 movptr(r12_heapbase, ExternalAddress((address)Universe::narrow_oop_base_addr())); 8756 } 8757 } 8758 #endif // _LP64 8759 8760 // IndexOf for constant substrings with size >= 8 chars 8761 // which don't need to be loaded through stack. 8762 void MacroAssembler::string_indexofC8(Register str1, Register str2, 8763 Register cnt1, Register cnt2, 8764 int int_cnt2, Register result, 8765 XMMRegister vec, Register tmp) { 8766 assert(UseSSE42Intrinsics, "SSE4.2 is required"); 8767 8768 // This method uses pcmpestri inxtruction with bound registers 8769 // inputs: 8770 // xmm - substring 8771 // rax - substring length (elements count) 8772 // mem - scanned string 8773 // rdx - string length (elements count) 8774 // 0xd - mode: 1100 (substring search) + 01 (unsigned shorts) 8775 // outputs: 8776 // rcx - matched index in string 8777 assert(cnt1 == rdx && cnt2 == rax && tmp == rcx, "pcmpestri"); 8778 8779 Label RELOAD_SUBSTR, SCAN_TO_SUBSTR, SCAN_SUBSTR, 8780 RET_FOUND, RET_NOT_FOUND, EXIT, FOUND_SUBSTR, 8781 MATCH_SUBSTR_HEAD, RELOAD_STR, FOUND_CANDIDATE; 8782 8783 // Note, inline_string_indexOf() generates checks: 8784 // if (substr.count > string.count) return -1; 8785 // if (substr.count == 0) return 0; 8786 assert(int_cnt2 >= 8, "this code isused only for cnt2 >= 8 chars"); 8787 8788 // Load substring. 8789 movdqu(vec, Address(str2, 0)); 8790 movl(cnt2, int_cnt2); 8791 movptr(result, str1); // string addr 8792 8793 if (int_cnt2 > 8) { 8794 jmpb(SCAN_TO_SUBSTR); 8795 8796 // Reload substr for rescan, this code 8797 // is executed only for large substrings (> 8 chars) 8798 bind(RELOAD_SUBSTR); 8799 movdqu(vec, Address(str2, 0)); 8800 negptr(cnt2); // Jumped here with negative cnt2, convert to positive 8801 8802 bind(RELOAD_STR); 8803 // We came here after the beginning of the substring was 8804 // matched but the rest of it was not so we need to search 8805 // again. Start from the next element after the previous match. 8806 8807 // cnt2 is number of substring reminding elements and 8808 // cnt1 is number of string reminding elements when cmp failed. 8809 // Restored cnt1 = cnt1 - cnt2 + int_cnt2 8810 subl(cnt1, cnt2); 8811 addl(cnt1, int_cnt2); 8812 movl(cnt2, int_cnt2); // Now restore cnt2 8813 8814 decrementl(cnt1); // Shift to next element 8815 cmpl(cnt1, cnt2); 8816 jccb(Assembler::negative, RET_NOT_FOUND); // Left less then substring 8817 8818 addptr(result, 2); 8819 8820 } // (int_cnt2 > 8) 8821 8822 // Scan string for start of substr in 16-byte vectors 8823 bind(SCAN_TO_SUBSTR); 8824 pcmpestri(vec, Address(result, 0), 0x0d); 8825 jccb(Assembler::below, FOUND_CANDIDATE); // CF == 1 8826 subl(cnt1, 8); 8827 jccb(Assembler::lessEqual, RET_NOT_FOUND); // Scanned full string 8828 cmpl(cnt1, cnt2); 8829 jccb(Assembler::negative, RET_NOT_FOUND); // Left less then substring 8830 addptr(result, 16); 8831 jmpb(SCAN_TO_SUBSTR); 8832 8833 // Found a potential substr 8834 bind(FOUND_CANDIDATE); 8835 // Matched whole vector if first element matched (tmp(rcx) == 0). 8836 if (int_cnt2 == 8) { 8837 jccb(Assembler::overflow, RET_FOUND); // OF == 1 8838 } else { // int_cnt2 > 8 8839 jccb(Assembler::overflow, FOUND_SUBSTR); 8840 } 8841 // After pcmpestri tmp(rcx) contains matched element index 8842 // Compute start addr of substr 8843 lea(result, Address(result, tmp, Address::times_2)); 8844 8845 // Make sure string is still long enough 8846 subl(cnt1, tmp); 8847 cmpl(cnt1, cnt2); 8848 if (int_cnt2 == 8) { 8849 jccb(Assembler::greaterEqual, SCAN_TO_SUBSTR); 8850 } else { // int_cnt2 > 8 8851 jccb(Assembler::greaterEqual, MATCH_SUBSTR_HEAD); 8852 } 8853 // Left less then substring. 8854 8855 bind(RET_NOT_FOUND); 8856 movl(result, -1); 8857 jmpb(EXIT); 8858 8859 if (int_cnt2 > 8) { 8860 // This code is optimized for the case when whole substring 8861 // is matched if its head is matched. 8862 bind(MATCH_SUBSTR_HEAD); 8863 pcmpestri(vec, Address(result, 0), 0x0d); 8864 // Reload only string if does not match 8865 jccb(Assembler::noOverflow, RELOAD_STR); // OF == 0 8866 8867 Label CONT_SCAN_SUBSTR; 8868 // Compare the rest of substring (> 8 chars). 8869 bind(FOUND_SUBSTR); 8870 // First 8 chars are already matched. 8871 negptr(cnt2); 8872 addptr(cnt2, 8); 8873 8874 bind(SCAN_SUBSTR); 8875 subl(cnt1, 8); 8876 cmpl(cnt2, -8); // Do not read beyond substring 8877 jccb(Assembler::lessEqual, CONT_SCAN_SUBSTR); 8878 // Back-up strings to avoid reading beyond substring: 8879 // cnt1 = cnt1 - cnt2 + 8 8880 addl(cnt1, cnt2); // cnt2 is negative 8881 addl(cnt1, 8); 8882 movl(cnt2, 8); negptr(cnt2); 8883 bind(CONT_SCAN_SUBSTR); 8884 if (int_cnt2 < (int)G) { 8885 movdqu(vec, Address(str2, cnt2, Address::times_2, int_cnt2*2)); 8886 pcmpestri(vec, Address(result, cnt2, Address::times_2, int_cnt2*2), 0x0d); 8887 } else { 8888 // calculate index in register to avoid integer overflow (int_cnt2*2) 8889 movl(tmp, int_cnt2); 8890 addptr(tmp, cnt2); 8891 movdqu(vec, Address(str2, tmp, Address::times_2, 0)); 8892 pcmpestri(vec, Address(result, tmp, Address::times_2, 0), 0x0d); 8893 } 8894 // Need to reload strings pointers if not matched whole vector 8895 jccb(Assembler::noOverflow, RELOAD_SUBSTR); // OF == 0 8896 addptr(cnt2, 8); 8897 jccb(Assembler::negative, SCAN_SUBSTR); 8898 // Fall through if found full substring 8899 8900 } // (int_cnt2 > 8) 8901 8902 bind(RET_FOUND); 8903 // Found result if we matched full small substring. 8904 // Compute substr offset 8905 subptr(result, str1); 8906 shrl(result, 1); // index 8907 bind(EXIT); 8908 8909 } // string_indexofC8 8910 8911 // Small strings are loaded through stack if they cross page boundary. 8912 void MacroAssembler::string_indexof(Register str1, Register str2, 8913 Register cnt1, Register cnt2, 8914 int int_cnt2, Register result, 8915 XMMRegister vec, Register tmp) { 8916 assert(UseSSE42Intrinsics, "SSE4.2 is required"); 8917 // 8918 // int_cnt2 is length of small (< 8 chars) constant substring 8919 // or (-1) for non constant substring in which case its length 8920 // is in cnt2 register. 8921 // 8922 // Note, inline_string_indexOf() generates checks: 8923 // if (substr.count > string.count) return -1; 8924 // if (substr.count == 0) return 0; 8925 // 8926 assert(int_cnt2 == -1 || (0 < int_cnt2 && int_cnt2 < 8), "should be != 0"); 8927 8928 // This method uses pcmpestri inxtruction with bound registers 8929 // inputs: 8930 // xmm - substring 8931 // rax - substring length (elements count) 8932 // mem - scanned string 8933 // rdx - string length (elements count) 8934 // 0xd - mode: 1100 (substring search) + 01 (unsigned shorts) 8935 // outputs: 8936 // rcx - matched index in string 8937 assert(cnt1 == rdx && cnt2 == rax && tmp == rcx, "pcmpestri"); 8938 8939 Label RELOAD_SUBSTR, SCAN_TO_SUBSTR, SCAN_SUBSTR, ADJUST_STR, 8940 RET_FOUND, RET_NOT_FOUND, CLEANUP, FOUND_SUBSTR, 8941 FOUND_CANDIDATE; 8942 8943 { //======================================================== 8944 // We don't know where these strings are located 8945 // and we can't read beyond them. Load them through stack. 8946 Label BIG_STRINGS, CHECK_STR, COPY_SUBSTR, COPY_STR; 8947 8948 movptr(tmp, rsp); // save old SP 8949 8950 if (int_cnt2 > 0) { // small (< 8 chars) constant substring 8951 if (int_cnt2 == 1) { // One char 8952 load_unsigned_short(result, Address(str2, 0)); 8953 movdl(vec, result); // move 32 bits 8954 } else if (int_cnt2 == 2) { // Two chars 8955 movdl(vec, Address(str2, 0)); // move 32 bits 8956 } else if (int_cnt2 == 4) { // Four chars 8957 movq(vec, Address(str2, 0)); // move 64 bits 8958 } else { // cnt2 = { 3, 5, 6, 7 } 8959 // Array header size is 12 bytes in 32-bit VM 8960 // + 6 bytes for 3 chars == 18 bytes, 8961 // enough space to load vec and shift. 8962 assert(HeapWordSize*typeArrayKlass::header_size() >= 12,"sanity"); 8963 movdqu(vec, Address(str2, (int_cnt2*2)-16)); 8964 psrldq(vec, 16-(int_cnt2*2)); 8965 } 8966 } else { // not constant substring 8967 cmpl(cnt2, 8); 8968 jccb(Assembler::aboveEqual, BIG_STRINGS); // Both strings are big enough 8969 8970 // We can read beyond string if srt+16 does not cross page boundary 8971 // since heaps are aligned and mapped by pages. 8972 assert(os::vm_page_size() < (int)G, "default page should be small"); 8973 movl(result, str2); // We need only low 32 bits 8974 andl(result, (os::vm_page_size()-1)); 8975 cmpl(result, (os::vm_page_size()-16)); 8976 jccb(Assembler::belowEqual, CHECK_STR); 8977 8978 // Move small strings to stack to allow load 16 bytes into vec. 8979 subptr(rsp, 16); 8980 int stk_offset = wordSize-2; 8981 push(cnt2); 8982 8983 bind(COPY_SUBSTR); 8984 load_unsigned_short(result, Address(str2, cnt2, Address::times_2, -2)); 8985 movw(Address(rsp, cnt2, Address::times_2, stk_offset), result); 8986 decrement(cnt2); 8987 jccb(Assembler::notZero, COPY_SUBSTR); 8988 8989 pop(cnt2); 8990 movptr(str2, rsp); // New substring address 8991 } // non constant 8992 8993 bind(CHECK_STR); 8994 cmpl(cnt1, 8); 8995 jccb(Assembler::aboveEqual, BIG_STRINGS); 8996 8997 // Check cross page boundary. 8998 movl(result, str1); // We need only low 32 bits 8999 andl(result, (os::vm_page_size()-1)); 9000 cmpl(result, (os::vm_page_size()-16)); 9001 jccb(Assembler::belowEqual, BIG_STRINGS); 9002 9003 subptr(rsp, 16); 9004 int stk_offset = -2; 9005 if (int_cnt2 < 0) { // not constant 9006 push(cnt2); 9007 stk_offset += wordSize; 9008 } 9009 movl(cnt2, cnt1); 9010 9011 bind(COPY_STR); 9012 load_unsigned_short(result, Address(str1, cnt2, Address::times_2, -2)); 9013 movw(Address(rsp, cnt2, Address::times_2, stk_offset), result); 9014 decrement(cnt2); 9015 jccb(Assembler::notZero, COPY_STR); 9016 9017 if (int_cnt2 < 0) { // not constant 9018 pop(cnt2); 9019 } 9020 movptr(str1, rsp); // New string address 9021 9022 bind(BIG_STRINGS); 9023 // Load substring. 9024 if (int_cnt2 < 0) { // -1 9025 movdqu(vec, Address(str2, 0)); 9026 push(cnt2); // substr count 9027 push(str2); // substr addr 9028 push(str1); // string addr 9029 } else { 9030 // Small (< 8 chars) constant substrings are loaded already. 9031 movl(cnt2, int_cnt2); 9032 } 9033 push(tmp); // original SP 9034 9035 } // Finished loading 9036 9037 //======================================================== 9038 // Start search 9039 // 9040 9041 movptr(result, str1); // string addr 9042 9043 if (int_cnt2 < 0) { // Only for non constant substring 9044 jmpb(SCAN_TO_SUBSTR); 9045 9046 // SP saved at sp+0 9047 // String saved at sp+1*wordSize 9048 // Substr saved at sp+2*wordSize 9049 // Substr count saved at sp+3*wordSize 9050 9051 // Reload substr for rescan, this code 9052 // is executed only for large substrings (> 8 chars) 9053 bind(RELOAD_SUBSTR); 9054 movptr(str2, Address(rsp, 2*wordSize)); 9055 movl(cnt2, Address(rsp, 3*wordSize)); 9056 movdqu(vec, Address(str2, 0)); 9057 // We came here after the beginning of the substring was 9058 // matched but the rest of it was not so we need to search 9059 // again. Start from the next element after the previous match. 9060 subptr(str1, result); // Restore counter 9061 shrl(str1, 1); 9062 addl(cnt1, str1); 9063 decrementl(cnt1); // Shift to next element 9064 cmpl(cnt1, cnt2); 9065 jccb(Assembler::negative, RET_NOT_FOUND); // Left less then substring 9066 9067 addptr(result, 2); 9068 } // non constant 9069 9070 // Scan string for start of substr in 16-byte vectors 9071 bind(SCAN_TO_SUBSTR); 9072 assert(cnt1 == rdx && cnt2 == rax && tmp == rcx, "pcmpestri"); 9073 pcmpestri(vec, Address(result, 0), 0x0d); 9074 jccb(Assembler::below, FOUND_CANDIDATE); // CF == 1 9075 subl(cnt1, 8); 9076 jccb(Assembler::lessEqual, RET_NOT_FOUND); // Scanned full string 9077 cmpl(cnt1, cnt2); 9078 jccb(Assembler::negative, RET_NOT_FOUND); // Left less then substring 9079 addptr(result, 16); 9080 9081 bind(ADJUST_STR); 9082 cmpl(cnt1, 8); // Do not read beyond string 9083 jccb(Assembler::greaterEqual, SCAN_TO_SUBSTR); 9084 // Back-up string to avoid reading beyond string. 9085 lea(result, Address(result, cnt1, Address::times_2, -16)); 9086 movl(cnt1, 8); 9087 jmpb(SCAN_TO_SUBSTR); 9088 9089 // Found a potential substr 9090 bind(FOUND_CANDIDATE); 9091 // After pcmpestri tmp(rcx) contains matched element index 9092 9093 // Make sure string is still long enough 9094 subl(cnt1, tmp); 9095 cmpl(cnt1, cnt2); 9096 jccb(Assembler::greaterEqual, FOUND_SUBSTR); 9097 // Left less then substring. 9098 9099 bind(RET_NOT_FOUND); 9100 movl(result, -1); 9101 jmpb(CLEANUP); 9102 9103 bind(FOUND_SUBSTR); 9104 // Compute start addr of substr 9105 lea(result, Address(result, tmp, Address::times_2)); 9106 9107 if (int_cnt2 > 0) { // Constant substring 9108 // Repeat search for small substring (< 8 chars) 9109 // from new point without reloading substring. 9110 // Have to check that we don't read beyond string. 9111 cmpl(tmp, 8-int_cnt2); 9112 jccb(Assembler::greater, ADJUST_STR); 9113 // Fall through if matched whole substring. 9114 } else { // non constant 9115 assert(int_cnt2 == -1, "should be != 0"); 9116 9117 addl(tmp, cnt2); 9118 // Found result if we matched whole substring. 9119 cmpl(tmp, 8); 9120 jccb(Assembler::lessEqual, RET_FOUND); 9121 9122 // Repeat search for small substring (<= 8 chars) 9123 // from new point 'str1' without reloading substring. 9124 cmpl(cnt2, 8); 9125 // Have to check that we don't read beyond string. 9126 jccb(Assembler::lessEqual, ADJUST_STR); 9127 9128 Label CHECK_NEXT, CONT_SCAN_SUBSTR, RET_FOUND_LONG; 9129 // Compare the rest of substring (> 8 chars). 9130 movptr(str1, result); 9131 9132 cmpl(tmp, cnt2); 9133 // First 8 chars are already matched. 9134 jccb(Assembler::equal, CHECK_NEXT); 9135 9136 bind(SCAN_SUBSTR); 9137 pcmpestri(vec, Address(str1, 0), 0x0d); 9138 // Need to reload strings pointers if not matched whole vector 9139 jcc(Assembler::noOverflow, RELOAD_SUBSTR); // OF == 0 9140 9141 bind(CHECK_NEXT); 9142 subl(cnt2, 8); 9143 jccb(Assembler::lessEqual, RET_FOUND_LONG); // Found full substring 9144 addptr(str1, 16); 9145 addptr(str2, 16); 9146 subl(cnt1, 8); 9147 cmpl(cnt2, 8); // Do not read beyond substring 9148 jccb(Assembler::greaterEqual, CONT_SCAN_SUBSTR); 9149 // Back-up strings to avoid reading beyond substring. 9150 lea(str2, Address(str2, cnt2, Address::times_2, -16)); 9151 lea(str1, Address(str1, cnt2, Address::times_2, -16)); 9152 subl(cnt1, cnt2); 9153 movl(cnt2, 8); 9154 addl(cnt1, 8); 9155 bind(CONT_SCAN_SUBSTR); 9156 movdqu(vec, Address(str2, 0)); 9157 jmpb(SCAN_SUBSTR); 9158 9159 bind(RET_FOUND_LONG); 9160 movptr(str1, Address(rsp, wordSize)); 9161 } // non constant 9162 9163 bind(RET_FOUND); 9164 // Compute substr offset 9165 subptr(result, str1); 9166 shrl(result, 1); // index 9167 9168 bind(CLEANUP); 9169 pop(rsp); // restore SP 9170 9171 } // string_indexof 9172 9173 // Compare strings. 9174 void MacroAssembler::string_compare(Register str1, Register str2, 9175 Register cnt1, Register cnt2, Register result, 9176 XMMRegister vec1) { 9177 Label LENGTH_DIFF_LABEL, POP_LABEL, DONE_LABEL, WHILE_HEAD_LABEL; 9178 9179 // Compute the minimum of the string lengths and the 9180 // difference of the string lengths (stack). 9181 // Do the conditional move stuff 9182 movl(result, cnt1); 9183 subl(cnt1, cnt2); 9184 push(cnt1); 9185 cmov32(Assembler::lessEqual, cnt2, result); 9186 9187 // Is the minimum length zero? 9188 testl(cnt2, cnt2); 9189 jcc(Assembler::zero, LENGTH_DIFF_LABEL); 9190 9191 // Load first characters 9192 load_unsigned_short(result, Address(str1, 0)); 9193 load_unsigned_short(cnt1, Address(str2, 0)); 9194 9195 // Compare first characters 9196 subl(result, cnt1); 9197 jcc(Assembler::notZero, POP_LABEL); 9198 decrementl(cnt2); 9199 jcc(Assembler::zero, LENGTH_DIFF_LABEL); 9200 9201 { 9202 // Check after comparing first character to see if strings are equivalent 9203 Label LSkip2; 9204 // Check if the strings start at same location 9205 cmpptr(str1, str2); 9206 jccb(Assembler::notEqual, LSkip2); 9207 9208 // Check if the length difference is zero (from stack) 9209 cmpl(Address(rsp, 0), 0x0); 9210 jcc(Assembler::equal, LENGTH_DIFF_LABEL); 9211 9212 // Strings might not be equivalent 9213 bind(LSkip2); 9214 } 9215 9216 Address::ScaleFactor scale = Address::times_2; 9217 int stride = 8; 9218 9219 // Advance to next element 9220 addptr(str1, 16/stride); 9221 addptr(str2, 16/stride); 9222 9223 if (UseSSE42Intrinsics) { 9224 Label COMPARE_WIDE_VECTORS, VECTOR_NOT_EQUAL, COMPARE_TAIL; 9225 int pcmpmask = 0x19; 9226 // Setup to compare 16-byte vectors 9227 movl(result, cnt2); 9228 andl(cnt2, ~(stride - 1)); // cnt2 holds the vector count 9229 jccb(Assembler::zero, COMPARE_TAIL); 9230 9231 lea(str1, Address(str1, result, scale)); 9232 lea(str2, Address(str2, result, scale)); 9233 negptr(result); 9234 9235 // pcmpestri 9236 // inputs: 9237 // vec1- substring 9238 // rax - negative string length (elements count) 9239 // mem - scaned string 9240 // rdx - string length (elements count) 9241 // pcmpmask - cmp mode: 11000 (string compare with negated result) 9242 // + 00 (unsigned bytes) or + 01 (unsigned shorts) 9243 // outputs: 9244 // rcx - first mismatched element index 9245 assert(result == rax && cnt2 == rdx && cnt1 == rcx, "pcmpestri"); 9246 9247 bind(COMPARE_WIDE_VECTORS); 9248 movdqu(vec1, Address(str1, result, scale)); 9249 pcmpestri(vec1, Address(str2, result, scale), pcmpmask); 9250 // After pcmpestri cnt1(rcx) contains mismatched element index 9251 9252 jccb(Assembler::below, VECTOR_NOT_EQUAL); // CF==1 9253 addptr(result, stride); 9254 subptr(cnt2, stride); 9255 jccb(Assembler::notZero, COMPARE_WIDE_VECTORS); 9256 9257 // compare wide vectors tail 9258 testl(result, result); 9259 jccb(Assembler::zero, LENGTH_DIFF_LABEL); 9260 9261 movl(cnt2, stride); 9262 movl(result, stride); 9263 negptr(result); 9264 movdqu(vec1, Address(str1, result, scale)); 9265 pcmpestri(vec1, Address(str2, result, scale), pcmpmask); 9266 jccb(Assembler::aboveEqual, LENGTH_DIFF_LABEL); 9267 9268 // Mismatched characters in the vectors 9269 bind(VECTOR_NOT_EQUAL); 9270 addptr(result, cnt1); 9271 movptr(cnt2, result); 9272 load_unsigned_short(result, Address(str1, cnt2, scale)); 9273 load_unsigned_short(cnt1, Address(str2, cnt2, scale)); 9274 subl(result, cnt1); 9275 jmpb(POP_LABEL); 9276 9277 bind(COMPARE_TAIL); // limit is zero 9278 movl(cnt2, result); 9279 // Fallthru to tail compare 9280 } 9281 9282 // Shift str2 and str1 to the end of the arrays, negate min 9283 lea(str1, Address(str1, cnt2, scale, 0)); 9284 lea(str2, Address(str2, cnt2, scale, 0)); 9285 negptr(cnt2); 9286 9287 // Compare the rest of the elements 9288 bind(WHILE_HEAD_LABEL); 9289 load_unsigned_short(result, Address(str1, cnt2, scale, 0)); 9290 load_unsigned_short(cnt1, Address(str2, cnt2, scale, 0)); 9291 subl(result, cnt1); 9292 jccb(Assembler::notZero, POP_LABEL); 9293 increment(cnt2); 9294 jccb(Assembler::notZero, WHILE_HEAD_LABEL); 9295 9296 // Strings are equal up to min length. Return the length difference. 9297 bind(LENGTH_DIFF_LABEL); 9298 pop(result); 9299 jmpb(DONE_LABEL); 9300 9301 // Discard the stored length difference 9302 bind(POP_LABEL); 9303 pop(cnt1); 9304 9305 // That's it 9306 bind(DONE_LABEL); 9307 } 9308 9309 // Compare char[] arrays aligned to 4 bytes or substrings. 9310 void MacroAssembler::char_arrays_equals(bool is_array_equ, Register ary1, Register ary2, 9311 Register limit, Register result, Register chr, 9312 XMMRegister vec1, XMMRegister vec2) { 9313 Label TRUE_LABEL, FALSE_LABEL, DONE, COMPARE_VECTORS, COMPARE_CHAR; 9314 9315 int length_offset = arrayOopDesc::length_offset_in_bytes(); 9316 int base_offset = arrayOopDesc::base_offset_in_bytes(T_CHAR); 9317 9318 // Check the input args 9319 cmpptr(ary1, ary2); 9320 jcc(Assembler::equal, TRUE_LABEL); 9321 9322 if (is_array_equ) { 9323 // Need additional checks for arrays_equals. 9324 testptr(ary1, ary1); 9325 jcc(Assembler::zero, FALSE_LABEL); 9326 testptr(ary2, ary2); 9327 jcc(Assembler::zero, FALSE_LABEL); 9328 9329 // Check the lengths 9330 movl(limit, Address(ary1, length_offset)); 9331 cmpl(limit, Address(ary2, length_offset)); 9332 jcc(Assembler::notEqual, FALSE_LABEL); 9333 } 9334 9335 // count == 0 9336 testl(limit, limit); 9337 jcc(Assembler::zero, TRUE_LABEL); 9338 9339 if (is_array_equ) { 9340 // Load array address 9341 lea(ary1, Address(ary1, base_offset)); 9342 lea(ary2, Address(ary2, base_offset)); 9343 } 9344 9345 shll(limit, 1); // byte count != 0 9346 movl(result, limit); // copy 9347 9348 if (UseSSE42Intrinsics) { 9349 // With SSE4.2, use double quad vector compare 9350 Label COMPARE_WIDE_VECTORS, COMPARE_TAIL; 9351 9352 // Compare 16-byte vectors 9353 andl(result, 0x0000000e); // tail count (in bytes) 9354 andl(limit, 0xfffffff0); // vector count (in bytes) 9355 jccb(Assembler::zero, COMPARE_TAIL); 9356 9357 lea(ary1, Address(ary1, limit, Address::times_1)); 9358 lea(ary2, Address(ary2, limit, Address::times_1)); 9359 negptr(limit); 9360 9361 bind(COMPARE_WIDE_VECTORS); 9362 movdqu(vec1, Address(ary1, limit, Address::times_1)); 9363 movdqu(vec2, Address(ary2, limit, Address::times_1)); 9364 pxor(vec1, vec2); 9365 9366 ptest(vec1, vec1); 9367 jccb(Assembler::notZero, FALSE_LABEL); 9368 addptr(limit, 16); 9369 jcc(Assembler::notZero, COMPARE_WIDE_VECTORS); 9370 9371 testl(result, result); 9372 jccb(Assembler::zero, TRUE_LABEL); 9373 9374 movdqu(vec1, Address(ary1, result, Address::times_1, -16)); 9375 movdqu(vec2, Address(ary2, result, Address::times_1, -16)); 9376 pxor(vec1, vec2); 9377 9378 ptest(vec1, vec1); 9379 jccb(Assembler::notZero, FALSE_LABEL); 9380 jmpb(TRUE_LABEL); 9381 9382 bind(COMPARE_TAIL); // limit is zero 9383 movl(limit, result); 9384 // Fallthru to tail compare 9385 } 9386 9387 // Compare 4-byte vectors 9388 andl(limit, 0xfffffffc); // vector count (in bytes) 9389 jccb(Assembler::zero, COMPARE_CHAR); 9390 9391 lea(ary1, Address(ary1, limit, Address::times_1)); 9392 lea(ary2, Address(ary2, limit, Address::times_1)); 9393 negptr(limit); 9394 9395 bind(COMPARE_VECTORS); 9396 movl(chr, Address(ary1, limit, Address::times_1)); 9397 cmpl(chr, Address(ary2, limit, Address::times_1)); 9398 jccb(Assembler::notEqual, FALSE_LABEL); 9399 addptr(limit, 4); 9400 jcc(Assembler::notZero, COMPARE_VECTORS); 9401 9402 // Compare trailing char (final 2 bytes), if any 9403 bind(COMPARE_CHAR); 9404 testl(result, 0x2); // tail char 9405 jccb(Assembler::zero, TRUE_LABEL); 9406 load_unsigned_short(chr, Address(ary1, 0)); 9407 load_unsigned_short(limit, Address(ary2, 0)); 9408 cmpl(chr, limit); 9409 jccb(Assembler::notEqual, FALSE_LABEL); 9410 9411 bind(TRUE_LABEL); 9412 movl(result, 1); // return true 9413 jmpb(DONE); 9414 9415 bind(FALSE_LABEL); 9416 xorl(result, result); // return false 9417 9418 // That's it 9419 bind(DONE); 9420 } 9421 9422 #ifdef PRODUCT 9423 #define BLOCK_COMMENT(str) /* nothing */ 9424 #else 9425 #define BLOCK_COMMENT(str) block_comment(str) 9426 #endif 9427 9428 #define BIND(label) bind(label); BLOCK_COMMENT(#label ":") 9429 void MacroAssembler::generate_fill(BasicType t, bool aligned, 9430 Register to, Register value, Register count, 9431 Register rtmp, XMMRegister xtmp) { 9432 assert_different_registers(to, value, count, rtmp); 9433 Label L_exit, L_skip_align1, L_skip_align2, L_fill_byte; 9434 Label L_fill_2_bytes, L_fill_4_bytes; 9435 9436 int shift = -1; 9437 switch (t) { 9438 case T_BYTE: 9439 shift = 2; 9440 break; 9441 case T_SHORT: 9442 shift = 1; 9443 break; 9444 case T_INT: 9445 shift = 0; 9446 break; 9447 default: ShouldNotReachHere(); 9448 } 9449 9450 if (t == T_BYTE) { 9451 andl(value, 0xff); 9452 movl(rtmp, value); 9453 shll(rtmp, 8); 9454 orl(value, rtmp); 9455 } 9456 if (t == T_SHORT) { 9457 andl(value, 0xffff); 9458 } 9459 if (t == T_BYTE || t == T_SHORT) { 9460 movl(rtmp, value); 9461 shll(rtmp, 16); 9462 orl(value, rtmp); 9463 } 9464 9465 cmpl(count, 2<<shift); // Short arrays (< 8 bytes) fill by element 9466 jcc(Assembler::below, L_fill_4_bytes); // use unsigned cmp 9467 if (!UseUnalignedLoadStores && !aligned && (t == T_BYTE || t == T_SHORT)) { 9468 // align source address at 4 bytes address boundary 9469 if (t == T_BYTE) { 9470 // One byte misalignment happens only for byte arrays 9471 testptr(to, 1); 9472 jccb(Assembler::zero, L_skip_align1); 9473 movb(Address(to, 0), value); 9474 increment(to); 9475 decrement(count); 9476 BIND(L_skip_align1); 9477 } 9478 // Two bytes misalignment happens only for byte and short (char) arrays 9479 testptr(to, 2); 9480 jccb(Assembler::zero, L_skip_align2); 9481 movw(Address(to, 0), value); 9482 addptr(to, 2); 9483 subl(count, 1<<(shift-1)); 9484 BIND(L_skip_align2); 9485 } 9486 if (UseSSE < 2) { 9487 Label L_fill_32_bytes_loop, L_check_fill_8_bytes, L_fill_8_bytes_loop, L_fill_8_bytes; 9488 // Fill 32-byte chunks 9489 subl(count, 8 << shift); 9490 jcc(Assembler::less, L_check_fill_8_bytes); 9491 align(16); 9492 9493 BIND(L_fill_32_bytes_loop); 9494 9495 for (int i = 0; i < 32; i += 4) { 9496 movl(Address(to, i), value); 9497 } 9498 9499 addptr(to, 32); 9500 subl(count, 8 << shift); 9501 jcc(Assembler::greaterEqual, L_fill_32_bytes_loop); 9502 BIND(L_check_fill_8_bytes); 9503 addl(count, 8 << shift); 9504 jccb(Assembler::zero, L_exit); 9505 jmpb(L_fill_8_bytes); 9506 9507 // 9508 // length is too short, just fill qwords 9509 // 9510 BIND(L_fill_8_bytes_loop); 9511 movl(Address(to, 0), value); 9512 movl(Address(to, 4), value); 9513 addptr(to, 8); 9514 BIND(L_fill_8_bytes); 9515 subl(count, 1 << (shift + 1)); 9516 jcc(Assembler::greaterEqual, L_fill_8_bytes_loop); 9517 // fall through to fill 4 bytes 9518 } else { 9519 Label L_fill_32_bytes; 9520 if (!UseUnalignedLoadStores) { 9521 // align to 8 bytes, we know we are 4 byte aligned to start 9522 testptr(to, 4); 9523 jccb(Assembler::zero, L_fill_32_bytes); 9524 movl(Address(to, 0), value); 9525 addptr(to, 4); 9526 subl(count, 1<<shift); 9527 } 9528 BIND(L_fill_32_bytes); 9529 { 9530 assert( UseSSE >= 2, "supported cpu only" ); 9531 Label L_fill_32_bytes_loop, L_check_fill_8_bytes, L_fill_8_bytes_loop, L_fill_8_bytes; 9532 // Fill 32-byte chunks 9533 movdl(xtmp, value); 9534 pshufd(xtmp, xtmp, 0); 9535 9536 subl(count, 8 << shift); 9537 jcc(Assembler::less, L_check_fill_8_bytes); 9538 align(16); 9539 9540 BIND(L_fill_32_bytes_loop); 9541 9542 if (UseUnalignedLoadStores) { 9543 movdqu(Address(to, 0), xtmp); 9544 movdqu(Address(to, 16), xtmp); 9545 } else { 9546 movq(Address(to, 0), xtmp); 9547 movq(Address(to, 8), xtmp); 9548 movq(Address(to, 16), xtmp); 9549 movq(Address(to, 24), xtmp); 9550 } 9551 9552 addptr(to, 32); 9553 subl(count, 8 << shift); 9554 jcc(Assembler::greaterEqual, L_fill_32_bytes_loop); 9555 BIND(L_check_fill_8_bytes); 9556 addl(count, 8 << shift); 9557 jccb(Assembler::zero, L_exit); 9558 jmpb(L_fill_8_bytes); 9559 9560 // 9561 // length is too short, just fill qwords 9562 // 9563 BIND(L_fill_8_bytes_loop); 9564 movq(Address(to, 0), xtmp); 9565 addptr(to, 8); 9566 BIND(L_fill_8_bytes); 9567 subl(count, 1 << (shift + 1)); 9568 jcc(Assembler::greaterEqual, L_fill_8_bytes_loop); 9569 } 9570 } 9571 // fill trailing 4 bytes 9572 BIND(L_fill_4_bytes); 9573 testl(count, 1<<shift); 9574 jccb(Assembler::zero, L_fill_2_bytes); 9575 movl(Address(to, 0), value); 9576 if (t == T_BYTE || t == T_SHORT) { 9577 addptr(to, 4); 9578 BIND(L_fill_2_bytes); 9579 // fill trailing 2 bytes 9580 testl(count, 1<<(shift-1)); 9581 jccb(Assembler::zero, L_fill_byte); 9582 movw(Address(to, 0), value); 9583 if (t == T_BYTE) { 9584 addptr(to, 2); 9585 BIND(L_fill_byte); 9586 // fill trailing byte 9587 testl(count, 1); 9588 jccb(Assembler::zero, L_exit); 9589 movb(Address(to, 0), value); 9590 } else { 9591 BIND(L_fill_byte); 9592 } 9593 } else { 9594 BIND(L_fill_2_bytes); 9595 } 9596 BIND(L_exit); 9597 } 9598 #undef BIND 9599 #undef BLOCK_COMMENT 9600 9601 9602 Assembler::Condition MacroAssembler::negate_condition(Assembler::Condition cond) { 9603 switch (cond) { 9604 // Note some conditions are synonyms for others 9605 case Assembler::zero: return Assembler::notZero; 9606 case Assembler::notZero: return Assembler::zero; 9607 case Assembler::less: return Assembler::greaterEqual; 9608 case Assembler::lessEqual: return Assembler::greater; 9609 case Assembler::greater: return Assembler::lessEqual; 9610 case Assembler::greaterEqual: return Assembler::less; 9611 case Assembler::below: return Assembler::aboveEqual; 9612 case Assembler::belowEqual: return Assembler::above; 9613 case Assembler::above: return Assembler::belowEqual; 9614 case Assembler::aboveEqual: return Assembler::below; 9615 case Assembler::overflow: return Assembler::noOverflow; 9616 case Assembler::noOverflow: return Assembler::overflow; 9617 case Assembler::negative: return Assembler::positive; 9618 case Assembler::positive: return Assembler::negative; 9619 case Assembler::parity: return Assembler::noParity; 9620 case Assembler::noParity: return Assembler::parity; 9621 } 9622 ShouldNotReachHere(); return Assembler::overflow; 9623 } 9624 9625 SkipIfEqual::SkipIfEqual( 9626 MacroAssembler* masm, const bool* flag_addr, bool value) { 9627 _masm = masm; 9628 _masm->cmp8(ExternalAddress((address)flag_addr), value); 9629 _masm->jcc(Assembler::equal, _label); 9630 } 9631 9632 SkipIfEqual::~SkipIfEqual() { 9633 _masm->bind(_label); 9634 }