1 /* 2 * Copyright (c) 2016, 2019, Oracle and/or its affiliates. All rights reserved. 3 * Copyright (c) 2016, 2019, SAP SE. All rights reserved. 4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 5 * 6 * This code is free software; you can redistribute it and/or modify it 7 * under the terms of the GNU General Public License version 2 only, as 8 * published by the Free Software Foundation. 9 * 10 * This code is distributed in the hope that it will be useful, but WITHOUT 11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 13 * version 2 for more details (a copy is included in the LICENSE file that 14 * accompanied this code). 15 * 16 * You should have received a copy of the GNU General Public License version 17 * 2 along with this work; if not, write to the Free Software Foundation, 18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 19 * 20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 21 * or visit www.oracle.com if you need additional information or have any 22 * questions. 23 * 24 */ 25 26 #include "precompiled.hpp" 27 #include "asm/codeBuffer.hpp" 28 #include "asm/macroAssembler.inline.hpp" 29 #include "compiler/disassembler.hpp" 30 #include "gc/shared/barrierSet.hpp" 31 #include "gc/shared/barrierSetAssembler.hpp" 32 #include "gc/shared/collectedHeap.inline.hpp" 33 #include "interpreter/interpreter.hpp" 34 #include "gc/shared/cardTableBarrierSet.hpp" 35 #include "memory/resourceArea.hpp" 36 #include "memory/universe.hpp" 37 #include "oops/accessDecorators.hpp" 38 #include "oops/compressedOops.inline.hpp" 39 #include "oops/klass.inline.hpp" 40 #ifdef COMPILER2 41 #include "opto/compile.hpp" 42 #include "opto/intrinsicnode.hpp" 43 #include "opto/matcher.hpp" 44 #endif 45 #include "prims/methodHandles.hpp" 46 #include "registerSaver_s390.hpp" 47 #include "runtime/biasedLocking.hpp" 48 #include "runtime/icache.hpp" 49 #include "runtime/interfaceSupport.inline.hpp" 50 #include "runtime/objectMonitor.hpp" 51 #include "runtime/os.hpp" 52 #include "runtime/safepoint.hpp" 53 #include "runtime/safepointMechanism.hpp" 54 #include "runtime/sharedRuntime.hpp" 55 #include "runtime/stubRoutines.hpp" 56 #include "utilities/events.hpp" 57 #include "utilities/macros.hpp" 58 59 #include <ucontext.h> 60 61 #define BLOCK_COMMENT(str) block_comment(str) 62 #define BIND(label) bind(label); BLOCK_COMMENT(#label ":") 63 64 // Move 32-bit register if destination and source are different. 65 void MacroAssembler::lr_if_needed(Register rd, Register rs) { 66 if (rs != rd) { z_lr(rd, rs); } 67 } 68 69 // Move register if destination and source are different. 70 void MacroAssembler::lgr_if_needed(Register rd, Register rs) { 71 if (rs != rd) { z_lgr(rd, rs); } 72 } 73 74 // Zero-extend 32-bit register into 64-bit register if destination and source are different. 75 void MacroAssembler::llgfr_if_needed(Register rd, Register rs) { 76 if (rs != rd) { z_llgfr(rd, rs); } 77 } 78 79 // Move float register if destination and source are different. 80 void MacroAssembler::ldr_if_needed(FloatRegister rd, FloatRegister rs) { 81 if (rs != rd) { z_ldr(rd, rs); } 82 } 83 84 // Move integer register if destination and source are different. 85 // It is assumed that shorter-than-int types are already 86 // appropriately sign-extended. 87 void MacroAssembler::move_reg_if_needed(Register dst, BasicType dst_type, Register src, 88 BasicType src_type) { 89 assert((dst_type != T_FLOAT) && (dst_type != T_DOUBLE), "use move_freg for float types"); 90 assert((src_type != T_FLOAT) && (src_type != T_DOUBLE), "use move_freg for float types"); 91 92 if (dst_type == src_type) { 93 lgr_if_needed(dst, src); // Just move all 64 bits. 94 return; 95 } 96 97 switch (dst_type) { 98 // Do not support these types for now. 99 // case T_BOOLEAN: 100 case T_BYTE: // signed byte 101 switch (src_type) { 102 case T_INT: 103 z_lgbr(dst, src); 104 break; 105 default: 106 ShouldNotReachHere(); 107 } 108 return; 109 110 case T_CHAR: 111 case T_SHORT: 112 switch (src_type) { 113 case T_INT: 114 if (dst_type == T_CHAR) { 115 z_llghr(dst, src); 116 } else { 117 z_lghr(dst, src); 118 } 119 break; 120 default: 121 ShouldNotReachHere(); 122 } 123 return; 124 125 case T_INT: 126 switch (src_type) { 127 case T_BOOLEAN: 128 case T_BYTE: 129 case T_CHAR: 130 case T_SHORT: 131 case T_INT: 132 case T_LONG: 133 case T_OBJECT: 134 case T_ARRAY: 135 case T_VOID: 136 case T_ADDRESS: 137 lr_if_needed(dst, src); 138 // llgfr_if_needed(dst, src); // zero-extend (in case we need to find a bug). 139 return; 140 141 default: 142 assert(false, "non-integer src type"); 143 return; 144 } 145 case T_LONG: 146 switch (src_type) { 147 case T_BOOLEAN: 148 case T_BYTE: 149 case T_CHAR: 150 case T_SHORT: 151 case T_INT: 152 z_lgfr(dst, src); // sign extension 153 return; 154 155 case T_LONG: 156 case T_OBJECT: 157 case T_ARRAY: 158 case T_VOID: 159 case T_ADDRESS: 160 lgr_if_needed(dst, src); 161 return; 162 163 default: 164 assert(false, "non-integer src type"); 165 return; 166 } 167 return; 168 case T_OBJECT: 169 case T_ARRAY: 170 case T_VOID: 171 case T_ADDRESS: 172 switch (src_type) { 173 // These types don't make sense to be converted to pointers: 174 // case T_BOOLEAN: 175 // case T_BYTE: 176 // case T_CHAR: 177 // case T_SHORT: 178 179 case T_INT: 180 z_llgfr(dst, src); // zero extension 181 return; 182 183 case T_LONG: 184 case T_OBJECT: 185 case T_ARRAY: 186 case T_VOID: 187 case T_ADDRESS: 188 lgr_if_needed(dst, src); 189 return; 190 191 default: 192 assert(false, "non-integer src type"); 193 return; 194 } 195 return; 196 default: 197 assert(false, "non-integer dst type"); 198 return; 199 } 200 } 201 202 // Move float register if destination and source are different. 203 void MacroAssembler::move_freg_if_needed(FloatRegister dst, BasicType dst_type, 204 FloatRegister src, BasicType src_type) { 205 assert((dst_type == T_FLOAT) || (dst_type == T_DOUBLE), "use move_reg for int types"); 206 assert((src_type == T_FLOAT) || (src_type == T_DOUBLE), "use move_reg for int types"); 207 if (dst_type == src_type) { 208 ldr_if_needed(dst, src); // Just move all 64 bits. 209 } else { 210 switch (dst_type) { 211 case T_FLOAT: 212 assert(src_type == T_DOUBLE, "invalid float type combination"); 213 z_ledbr(dst, src); 214 return; 215 case T_DOUBLE: 216 assert(src_type == T_FLOAT, "invalid float type combination"); 217 z_ldebr(dst, src); 218 return; 219 default: 220 assert(false, "non-float dst type"); 221 return; 222 } 223 } 224 } 225 226 // Optimized emitter for reg to mem operations. 227 // Uses modern instructions if running on modern hardware, classic instructions 228 // otherwise. Prefers (usually shorter) classic instructions if applicable. 229 // Data register (reg) cannot be used as work register. 230 // 231 // Don't rely on register locking, instead pass a scratch register (Z_R0 by default). 232 // CAUTION! Passing registers >= Z_R2 may produce bad results on old CPUs! 233 void MacroAssembler::freg2mem_opt(FloatRegister reg, 234 int64_t disp, 235 Register index, 236 Register base, 237 void (MacroAssembler::*modern) (FloatRegister, int64_t, Register, Register), 238 void (MacroAssembler::*classic)(FloatRegister, int64_t, Register, Register), 239 Register scratch) { 240 index = (index == noreg) ? Z_R0 : index; 241 if (Displacement::is_shortDisp(disp)) { 242 (this->*classic)(reg, disp, index, base); 243 } else { 244 if (Displacement::is_validDisp(disp)) { 245 (this->*modern)(reg, disp, index, base); 246 } else { 247 if (scratch != Z_R0 && scratch != Z_R1) { 248 (this->*modern)(reg, disp, index, base); // Will fail with disp out of range. 249 } else { 250 if (scratch != Z_R0) { // scratch == Z_R1 251 if ((scratch == index) || (index == base)) { 252 (this->*modern)(reg, disp, index, base); // Will fail with disp out of range. 253 } else { 254 add2reg(scratch, disp, base); 255 (this->*classic)(reg, 0, index, scratch); 256 if (base == scratch) { 257 add2reg(base, -disp); // Restore base. 258 } 259 } 260 } else { // scratch == Z_R0 261 z_lgr(scratch, base); 262 add2reg(base, disp); 263 (this->*classic)(reg, 0, index, base); 264 z_lgr(base, scratch); // Restore base. 265 } 266 } 267 } 268 } 269 } 270 271 void MacroAssembler::freg2mem_opt(FloatRegister reg, const Address &a, bool is_double) { 272 if (is_double) { 273 freg2mem_opt(reg, a.disp20(), a.indexOrR0(), a.baseOrR0(), MODERN_FFUN(z_stdy), CLASSIC_FFUN(z_std)); 274 } else { 275 freg2mem_opt(reg, a.disp20(), a.indexOrR0(), a.baseOrR0(), MODERN_FFUN(z_stey), CLASSIC_FFUN(z_ste)); 276 } 277 } 278 279 // Optimized emitter for mem to reg operations. 280 // Uses modern instructions if running on modern hardware, classic instructions 281 // otherwise. Prefers (usually shorter) classic instructions if applicable. 282 // data register (reg) cannot be used as work register. 283 // 284 // Don't rely on register locking, instead pass a scratch register (Z_R0 by default). 285 // CAUTION! Passing registers >= Z_R2 may produce bad results on old CPUs! 286 void MacroAssembler::mem2freg_opt(FloatRegister reg, 287 int64_t disp, 288 Register index, 289 Register base, 290 void (MacroAssembler::*modern) (FloatRegister, int64_t, Register, Register), 291 void (MacroAssembler::*classic)(FloatRegister, int64_t, Register, Register), 292 Register scratch) { 293 index = (index == noreg) ? Z_R0 : index; 294 if (Displacement::is_shortDisp(disp)) { 295 (this->*classic)(reg, disp, index, base); 296 } else { 297 if (Displacement::is_validDisp(disp)) { 298 (this->*modern)(reg, disp, index, base); 299 } else { 300 if (scratch != Z_R0 && scratch != Z_R1) { 301 (this->*modern)(reg, disp, index, base); // Will fail with disp out of range. 302 } else { 303 if (scratch != Z_R0) { // scratch == Z_R1 304 if ((scratch == index) || (index == base)) { 305 (this->*modern)(reg, disp, index, base); // Will fail with disp out of range. 306 } else { 307 add2reg(scratch, disp, base); 308 (this->*classic)(reg, 0, index, scratch); 309 if (base == scratch) { 310 add2reg(base, -disp); // Restore base. 311 } 312 } 313 } else { // scratch == Z_R0 314 z_lgr(scratch, base); 315 add2reg(base, disp); 316 (this->*classic)(reg, 0, index, base); 317 z_lgr(base, scratch); // Restore base. 318 } 319 } 320 } 321 } 322 } 323 324 void MacroAssembler::mem2freg_opt(FloatRegister reg, const Address &a, bool is_double) { 325 if (is_double) { 326 mem2freg_opt(reg, a.disp20(), a.indexOrR0(), a.baseOrR0(), MODERN_FFUN(z_ldy), CLASSIC_FFUN(z_ld)); 327 } else { 328 mem2freg_opt(reg, a.disp20(), a.indexOrR0(), a.baseOrR0(), MODERN_FFUN(z_ley), CLASSIC_FFUN(z_le)); 329 } 330 } 331 332 // Optimized emitter for reg to mem operations. 333 // Uses modern instructions if running on modern hardware, classic instructions 334 // otherwise. Prefers (usually shorter) classic instructions if applicable. 335 // Data register (reg) cannot be used as work register. 336 // 337 // Don't rely on register locking, instead pass a scratch register 338 // (Z_R0 by default) 339 // CAUTION! passing registers >= Z_R2 may produce bad results on old CPUs! 340 void MacroAssembler::reg2mem_opt(Register reg, 341 int64_t disp, 342 Register index, 343 Register base, 344 void (MacroAssembler::*modern) (Register, int64_t, Register, Register), 345 void (MacroAssembler::*classic)(Register, int64_t, Register, Register), 346 Register scratch) { 347 index = (index == noreg) ? Z_R0 : index; 348 if (Displacement::is_shortDisp(disp)) { 349 (this->*classic)(reg, disp, index, base); 350 } else { 351 if (Displacement::is_validDisp(disp)) { 352 (this->*modern)(reg, disp, index, base); 353 } else { 354 if (scratch != Z_R0 && scratch != Z_R1) { 355 (this->*modern)(reg, disp, index, base); // Will fail with disp out of range. 356 } else { 357 if (scratch != Z_R0) { // scratch == Z_R1 358 if ((scratch == index) || (index == base)) { 359 (this->*modern)(reg, disp, index, base); // Will fail with disp out of range. 360 } else { 361 add2reg(scratch, disp, base); 362 (this->*classic)(reg, 0, index, scratch); 363 if (base == scratch) { 364 add2reg(base, -disp); // Restore base. 365 } 366 } 367 } else { // scratch == Z_R0 368 if ((scratch == reg) || (scratch == base) || (reg == base)) { 369 (this->*modern)(reg, disp, index, base); // Will fail with disp out of range. 370 } else { 371 z_lgr(scratch, base); 372 add2reg(base, disp); 373 (this->*classic)(reg, 0, index, base); 374 z_lgr(base, scratch); // Restore base. 375 } 376 } 377 } 378 } 379 } 380 } 381 382 int MacroAssembler::reg2mem_opt(Register reg, const Address &a, bool is_double) { 383 int store_offset = offset(); 384 if (is_double) { 385 reg2mem_opt(reg, a.disp20(), a.indexOrR0(), a.baseOrR0(), MODERN_IFUN(z_stg), CLASSIC_IFUN(z_stg)); 386 } else { 387 reg2mem_opt(reg, a.disp20(), a.indexOrR0(), a.baseOrR0(), MODERN_IFUN(z_sty), CLASSIC_IFUN(z_st)); 388 } 389 return store_offset; 390 } 391 392 // Optimized emitter for mem to reg operations. 393 // Uses modern instructions if running on modern hardware, classic instructions 394 // otherwise. Prefers (usually shorter) classic instructions if applicable. 395 // Data register (reg) will be used as work register where possible. 396 void MacroAssembler::mem2reg_opt(Register reg, 397 int64_t disp, 398 Register index, 399 Register base, 400 void (MacroAssembler::*modern) (Register, int64_t, Register, Register), 401 void (MacroAssembler::*classic)(Register, int64_t, Register, Register)) { 402 index = (index == noreg) ? Z_R0 : index; 403 if (Displacement::is_shortDisp(disp)) { 404 (this->*classic)(reg, disp, index, base); 405 } else { 406 if (Displacement::is_validDisp(disp)) { 407 (this->*modern)(reg, disp, index, base); 408 } else { 409 if ((reg == index) && (reg == base)) { 410 z_sllg(reg, reg, 1); 411 add2reg(reg, disp); 412 (this->*classic)(reg, 0, noreg, reg); 413 } else if ((reg == index) && (reg != Z_R0)) { 414 add2reg(reg, disp); 415 (this->*classic)(reg, 0, reg, base); 416 } else if (reg == base) { 417 add2reg(reg, disp); 418 (this->*classic)(reg, 0, index, reg); 419 } else if (reg != Z_R0) { 420 add2reg(reg, disp, base); 421 (this->*classic)(reg, 0, index, reg); 422 } else { // reg == Z_R0 && reg != base here 423 add2reg(base, disp); 424 (this->*classic)(reg, 0, index, base); 425 add2reg(base, -disp); 426 } 427 } 428 } 429 } 430 431 void MacroAssembler::mem2reg_opt(Register reg, const Address &a, bool is_double) { 432 if (is_double) { 433 z_lg(reg, a); 434 } else { 435 mem2reg_opt(reg, a.disp20(), a.indexOrR0(), a.baseOrR0(), MODERN_IFUN(z_ly), CLASSIC_IFUN(z_l)); 436 } 437 } 438 439 void MacroAssembler::mem2reg_signed_opt(Register reg, const Address &a) { 440 mem2reg_opt(reg, a.disp20(), a.indexOrR0(), a.baseOrR0(), MODERN_IFUN(z_lgf), CLASSIC_IFUN(z_lgf)); 441 } 442 443 void MacroAssembler::and_imm(Register r, long mask, 444 Register tmp /* = Z_R0 */, 445 bool wide /* = false */) { 446 assert(wide || Immediate::is_simm32(mask), "mask value too large"); 447 448 if (!wide) { 449 z_nilf(r, mask); 450 return; 451 } 452 453 assert(r != tmp, " need a different temporary register !"); 454 load_const_optimized(tmp, mask); 455 z_ngr(r, tmp); 456 } 457 458 // Calculate the 1's complement. 459 // Note: The condition code is neither preserved nor correctly set by this code!!! 460 // Note: (wide == false) does not protect the high order half of the target register 461 // from alteration. It only serves as optimization hint for 32-bit results. 462 void MacroAssembler::not_(Register r1, Register r2, bool wide) { 463 464 if ((r2 == noreg) || (r2 == r1)) { // Calc 1's complement in place. 465 z_xilf(r1, -1); 466 if (wide) { 467 z_xihf(r1, -1); 468 } 469 } else { // Distinct src and dst registers. 470 load_const_optimized(r1, -1); 471 z_xgr(r1, r2); 472 } 473 } 474 475 unsigned long MacroAssembler::create_mask(int lBitPos, int rBitPos) { 476 assert(lBitPos >= 0, "zero is leftmost bit position"); 477 assert(rBitPos <= 63, "63 is rightmost bit position"); 478 assert(lBitPos <= rBitPos, "inverted selection interval"); 479 return (lBitPos == 0 ? (unsigned long)(-1L) : ((1UL<<(63-lBitPos+1))-1)) & (~((1UL<<(63-rBitPos))-1)); 480 } 481 482 // Helper function for the "Rotate_then_<logicalOP>" emitters. 483 // Rotate src, then mask register contents such that only bits in range survive. 484 // For oneBits == false, all bits not in range are set to 0. Useful for deleting all bits outside range. 485 // For oneBits == true, all bits not in range are set to 1. Useful for preserving all bits outside range. 486 // The caller must ensure that the selected range only contains bits with defined value. 487 void MacroAssembler::rotate_then_mask(Register dst, Register src, int lBitPos, int rBitPos, 488 int nRotate, bool src32bit, bool dst32bit, bool oneBits) { 489 assert(!(dst32bit && lBitPos < 32), "selection interval out of range for int destination"); 490 bool sll4rll = (nRotate >= 0) && (nRotate <= (63-rBitPos)); // Substitute SLL(G) for RLL(G). 491 bool srl4rll = (nRotate < 0) && (-nRotate <= lBitPos); // Substitute SRL(G) for RLL(G). 492 // Pre-determine which parts of dst will be zero after shift/rotate. 493 bool llZero = sll4rll && (nRotate >= 16); 494 bool lhZero = (sll4rll && (nRotate >= 32)) || (srl4rll && (nRotate <= -48)); 495 bool lfZero = llZero && lhZero; 496 bool hlZero = (sll4rll && (nRotate >= 48)) || (srl4rll && (nRotate <= -32)); 497 bool hhZero = (srl4rll && (nRotate <= -16)); 498 bool hfZero = hlZero && hhZero; 499 500 // rotate then mask src operand. 501 // if oneBits == true, all bits outside selected range are 1s. 502 // if oneBits == false, all bits outside selected range are 0s. 503 if (src32bit) { // There might be garbage in the upper 32 bits which will get masked away. 504 if (dst32bit) { 505 z_rll(dst, src, nRotate); // Copy and rotate, upper half of reg remains undisturbed. 506 } else { 507 if (sll4rll) { z_sllg(dst, src, nRotate); } 508 else if (srl4rll) { z_srlg(dst, src, -nRotate); } 509 else { z_rllg(dst, src, nRotate); } 510 } 511 } else { 512 if (sll4rll) { z_sllg(dst, src, nRotate); } 513 else if (srl4rll) { z_srlg(dst, src, -nRotate); } 514 else { z_rllg(dst, src, nRotate); } 515 } 516 517 unsigned long range_mask = create_mask(lBitPos, rBitPos); 518 unsigned int range_mask_h = (unsigned int)(range_mask >> 32); 519 unsigned int range_mask_l = (unsigned int)range_mask; 520 unsigned short range_mask_hh = (unsigned short)(range_mask >> 48); 521 unsigned short range_mask_hl = (unsigned short)(range_mask >> 32); 522 unsigned short range_mask_lh = (unsigned short)(range_mask >> 16); 523 unsigned short range_mask_ll = (unsigned short)range_mask; 524 // Works for z9 and newer H/W. 525 if (oneBits) { 526 if ((~range_mask_l) != 0) { z_oilf(dst, ~range_mask_l); } // All bits outside range become 1s. 527 if (((~range_mask_h) != 0) && !dst32bit) { z_oihf(dst, ~range_mask_h); } 528 } else { 529 // All bits outside range become 0s 530 if (((~range_mask_l) != 0) && !lfZero) { 531 z_nilf(dst, range_mask_l); 532 } 533 if (((~range_mask_h) != 0) && !dst32bit && !hfZero) { 534 z_nihf(dst, range_mask_h); 535 } 536 } 537 } 538 539 // Rotate src, then insert selected range from rotated src into dst. 540 // Clear dst before, if requested. 541 void MacroAssembler::rotate_then_insert(Register dst, Register src, int lBitPos, int rBitPos, 542 int nRotate, bool clear_dst) { 543 // This version does not depend on src being zero-extended int2long. 544 nRotate &= 0x003f; // For risbg, pretend it's an unsigned value. 545 z_risbg(dst, src, lBitPos, rBitPos, nRotate, clear_dst); // Rotate, then insert selected, clear the rest. 546 } 547 548 // Rotate src, then and selected range from rotated src into dst. 549 // Set condition code only if so requested. Otherwise it is unpredictable. 550 // See performance note in macroAssembler_s390.hpp for important information. 551 void MacroAssembler::rotate_then_and(Register dst, Register src, int lBitPos, int rBitPos, 552 int nRotate, bool test_only) { 553 guarantee(!test_only, "Emitter not fit for test_only instruction variant."); 554 // This version does not depend on src being zero-extended int2long. 555 nRotate &= 0x003f; // For risbg, pretend it's an unsigned value. 556 z_rxsbg(dst, src, lBitPos, rBitPos, nRotate, test_only); // Rotate, then xor selected. 557 } 558 559 // Rotate src, then or selected range from rotated src into dst. 560 // Set condition code only if so requested. Otherwise it is unpredictable. 561 // See performance note in macroAssembler_s390.hpp for important information. 562 void MacroAssembler::rotate_then_or(Register dst, Register src, int lBitPos, int rBitPos, 563 int nRotate, bool test_only) { 564 guarantee(!test_only, "Emitter not fit for test_only instruction variant."); 565 // This version does not depend on src being zero-extended int2long. 566 nRotate &= 0x003f; // For risbg, pretend it's an unsigned value. 567 z_rosbg(dst, src, lBitPos, rBitPos, nRotate, test_only); // Rotate, then xor selected. 568 } 569 570 // Rotate src, then xor selected range from rotated src into dst. 571 // Set condition code only if so requested. Otherwise it is unpredictable. 572 // See performance note in macroAssembler_s390.hpp for important information. 573 void MacroAssembler::rotate_then_xor(Register dst, Register src, int lBitPos, int rBitPos, 574 int nRotate, bool test_only) { 575 guarantee(!test_only, "Emitter not fit for test_only instruction variant."); 576 // This version does not depend on src being zero-extended int2long. 577 nRotate &= 0x003f; // For risbg, pretend it's an unsigned value. 578 z_rxsbg(dst, src, lBitPos, rBitPos, nRotate, test_only); // Rotate, then xor selected. 579 } 580 581 void MacroAssembler::add64(Register r1, RegisterOrConstant inc) { 582 if (inc.is_register()) { 583 z_agr(r1, inc.as_register()); 584 } else { // constant 585 intptr_t imm = inc.as_constant(); 586 add2reg(r1, imm); 587 } 588 } 589 // Helper function to multiply the 64bit contents of a register by a 16bit constant. 590 // The optimization tries to avoid the mghi instruction, since it uses the FPU for 591 // calculation and is thus rather slow. 592 // 593 // There is no handling for special cases, e.g. cval==0 or cval==1. 594 // 595 // Returns len of generated code block. 596 unsigned int MacroAssembler::mul_reg64_const16(Register rval, Register work, int cval) { 597 int block_start = offset(); 598 599 bool sign_flip = cval < 0; 600 cval = sign_flip ? -cval : cval; 601 602 BLOCK_COMMENT("Reg64*Con16 {"); 603 604 int bit1 = cval & -cval; 605 if (bit1 == cval) { 606 z_sllg(rval, rval, exact_log2(bit1)); 607 if (sign_flip) { z_lcgr(rval, rval); } 608 } else { 609 int bit2 = (cval-bit1) & -(cval-bit1); 610 if ((bit1+bit2) == cval) { 611 z_sllg(work, rval, exact_log2(bit1)); 612 z_sllg(rval, rval, exact_log2(bit2)); 613 z_agr(rval, work); 614 if (sign_flip) { z_lcgr(rval, rval); } 615 } else { 616 if (sign_flip) { z_mghi(rval, -cval); } 617 else { z_mghi(rval, cval); } 618 } 619 } 620 BLOCK_COMMENT("} Reg64*Con16"); 621 622 int block_end = offset(); 623 return block_end - block_start; 624 } 625 626 // Generic operation r1 := r2 + imm. 627 // 628 // Should produce the best code for each supported CPU version. 629 // r2 == noreg yields r1 := r1 + imm 630 // imm == 0 emits either no instruction or r1 := r2 ! 631 // NOTES: 1) Don't use this function where fixed sized 632 // instruction sequences are required!!! 633 // 2) Don't use this function if condition code 634 // setting is required! 635 // 3) Despite being declared as int64_t, the parameter imm 636 // must be a simm_32 value (= signed 32-bit integer). 637 void MacroAssembler::add2reg(Register r1, int64_t imm, Register r2) { 638 assert(Immediate::is_simm32(imm), "probably an implicit conversion went wrong"); 639 640 if (r2 == noreg) { r2 = r1; } 641 642 // Handle special case imm == 0. 643 if (imm == 0) { 644 lgr_if_needed(r1, r2); 645 // Nothing else to do. 646 return; 647 } 648 649 if (!PreferLAoverADD || (r2 == Z_R0)) { 650 bool distinctOpnds = VM_Version::has_DistinctOpnds(); 651 652 // Can we encode imm in 16 bits signed? 653 if (Immediate::is_simm16(imm)) { 654 if (r1 == r2) { 655 z_aghi(r1, imm); 656 return; 657 } 658 if (distinctOpnds) { 659 z_aghik(r1, r2, imm); 660 return; 661 } 662 z_lgr(r1, r2); 663 z_aghi(r1, imm); 664 return; 665 } 666 } else { 667 // Can we encode imm in 12 bits unsigned? 668 if (Displacement::is_shortDisp(imm)) { 669 z_la(r1, imm, r2); 670 return; 671 } 672 // Can we encode imm in 20 bits signed? 673 if (Displacement::is_validDisp(imm)) { 674 // Always use LAY instruction, so we don't need the tmp register. 675 z_lay(r1, imm, r2); 676 return; 677 } 678 679 } 680 681 // Can handle it (all possible values) with long immediates. 682 lgr_if_needed(r1, r2); 683 z_agfi(r1, imm); 684 } 685 686 // Generic operation r := b + x + d 687 // 688 // Addition of several operands with address generation semantics - sort of: 689 // - no restriction on the registers. Any register will do for any operand. 690 // - x == noreg: operand will be disregarded. 691 // - b == noreg: will use (contents of) result reg as operand (r := r + d). 692 // - x == Z_R0: just disregard 693 // - b == Z_R0: use as operand. This is not address generation semantics!!! 694 // 695 // The same restrictions as on add2reg() are valid!!! 696 void MacroAssembler::add2reg_with_index(Register r, int64_t d, Register x, Register b) { 697 assert(Immediate::is_simm32(d), "probably an implicit conversion went wrong"); 698 699 if (x == noreg) { x = Z_R0; } 700 if (b == noreg) { b = r; } 701 702 // Handle special case x == R0. 703 if (x == Z_R0) { 704 // Can simply add the immediate value to the base register. 705 add2reg(r, d, b); 706 return; 707 } 708 709 if (!PreferLAoverADD || (b == Z_R0)) { 710 bool distinctOpnds = VM_Version::has_DistinctOpnds(); 711 // Handle special case d == 0. 712 if (d == 0) { 713 if (b == x) { z_sllg(r, b, 1); return; } 714 if (r == x) { z_agr(r, b); return; } 715 if (r == b) { z_agr(r, x); return; } 716 if (distinctOpnds) { z_agrk(r, x, b); return; } 717 z_lgr(r, b); 718 z_agr(r, x); 719 } else { 720 if (x == b) { z_sllg(r, x, 1); } 721 else if (r == x) { z_agr(r, b); } 722 else if (r == b) { z_agr(r, x); } 723 else if (distinctOpnds) { z_agrk(r, x, b); } 724 else { 725 z_lgr(r, b); 726 z_agr(r, x); 727 } 728 add2reg(r, d); 729 } 730 } else { 731 // Can we encode imm in 12 bits unsigned? 732 if (Displacement::is_shortDisp(d)) { 733 z_la(r, d, x, b); 734 return; 735 } 736 // Can we encode imm in 20 bits signed? 737 if (Displacement::is_validDisp(d)) { 738 z_lay(r, d, x, b); 739 return; 740 } 741 z_la(r, 0, x, b); 742 add2reg(r, d); 743 } 744 } 745 746 // Generic emitter (32bit) for direct memory increment. 747 // For optimal code, do not specify Z_R0 as temp register. 748 void MacroAssembler::add2mem_32(const Address &a, int64_t imm, Register tmp) { 749 if (VM_Version::has_MemWithImmALUOps() && Immediate::is_simm8(imm)) { 750 z_asi(a, imm); 751 } else { 752 z_lgf(tmp, a); 753 add2reg(tmp, imm); 754 z_st(tmp, a); 755 } 756 } 757 758 void MacroAssembler::add2mem_64(const Address &a, int64_t imm, Register tmp) { 759 if (VM_Version::has_MemWithImmALUOps() && Immediate::is_simm8(imm)) { 760 z_agsi(a, imm); 761 } else { 762 z_lg(tmp, a); 763 add2reg(tmp, imm); 764 z_stg(tmp, a); 765 } 766 } 767 768 void MacroAssembler::load_sized_value(Register dst, Address src, size_t size_in_bytes, bool is_signed) { 769 switch (size_in_bytes) { 770 case 8: z_lg(dst, src); break; 771 case 4: is_signed ? z_lgf(dst, src) : z_llgf(dst, src); break; 772 case 2: is_signed ? z_lgh(dst, src) : z_llgh(dst, src); break; 773 case 1: is_signed ? z_lgb(dst, src) : z_llgc(dst, src); break; 774 default: ShouldNotReachHere(); 775 } 776 } 777 778 void MacroAssembler::store_sized_value(Register src, Address dst, size_t size_in_bytes) { 779 switch (size_in_bytes) { 780 case 8: z_stg(src, dst); break; 781 case 4: z_st(src, dst); break; 782 case 2: z_sth(src, dst); break; 783 case 1: z_stc(src, dst); break; 784 default: ShouldNotReachHere(); 785 } 786 } 787 788 // Split a si20 offset (20bit, signed) into an ui12 offset (12bit, unsigned) and 789 // a high-order summand in register tmp. 790 // 791 // return value: < 0: No split required, si20 actually has property uimm12. 792 // >= 0: Split performed. Use return value as uimm12 displacement and 793 // tmp as index register. 794 int MacroAssembler::split_largeoffset(int64_t si20_offset, Register tmp, bool fixed_codelen, bool accumulate) { 795 assert(Immediate::is_simm20(si20_offset), "sanity"); 796 int lg_off = (int)si20_offset & 0x0fff; // Punch out low-order 12 bits, always positive. 797 int ll_off = (int)si20_offset & ~0x0fff; // Force low-order 12 bits to zero. 798 assert((Displacement::is_shortDisp(si20_offset) && (ll_off == 0)) || 799 !Displacement::is_shortDisp(si20_offset), "unexpected offset values"); 800 assert((lg_off+ll_off) == si20_offset, "offset splitup error"); 801 802 Register work = accumulate? Z_R0 : tmp; 803 804 if (fixed_codelen) { // Len of code = 10 = 4 + 6. 805 z_lghi(work, ll_off>>12); // Implicit sign extension. 806 z_slag(work, work, 12); 807 } else { // Len of code = 0..10. 808 if (ll_off == 0) { return -1; } 809 // ll_off has 8 significant bits (at most) plus sign. 810 if ((ll_off & 0x0000f000) == 0) { // Non-zero bits only in upper halfbyte. 811 z_llilh(work, ll_off >> 16); 812 if (ll_off < 0) { // Sign-extension required. 813 z_lgfr(work, work); 814 } 815 } else { 816 if ((ll_off & 0x000f0000) == 0) { // Non-zero bits only in lower halfbyte. 817 z_llill(work, ll_off); 818 } else { // Non-zero bits in both halfbytes. 819 z_lghi(work, ll_off>>12); // Implicit sign extension. 820 z_slag(work, work, 12); 821 } 822 } 823 } 824 if (accumulate) { z_algr(tmp, work); } // len of code += 4 825 return lg_off; 826 } 827 828 void MacroAssembler::load_float_largeoffset(FloatRegister t, int64_t si20, Register a, Register tmp) { 829 if (Displacement::is_validDisp(si20)) { 830 z_ley(t, si20, a); 831 } else { 832 // Fixed_codelen = true is a simple way to ensure that the size of load_float_largeoffset 833 // does not depend on si20 (scratch buffer emit size == code buffer emit size for constant 834 // pool loads). 835 bool accumulate = true; 836 bool fixed_codelen = true; 837 Register work; 838 839 if (fixed_codelen) { 840 z_lgr(tmp, a); // Lgr_if_needed not applicable due to fixed_codelen. 841 } else { 842 accumulate = (a == tmp); 843 } 844 work = tmp; 845 846 int disp12 = split_largeoffset(si20, work, fixed_codelen, accumulate); 847 if (disp12 < 0) { 848 z_le(t, si20, work); 849 } else { 850 if (accumulate) { 851 z_le(t, disp12, work); 852 } else { 853 z_le(t, disp12, work, a); 854 } 855 } 856 } 857 } 858 859 void MacroAssembler::load_double_largeoffset(FloatRegister t, int64_t si20, Register a, Register tmp) { 860 if (Displacement::is_validDisp(si20)) { 861 z_ldy(t, si20, a); 862 } else { 863 // Fixed_codelen = true is a simple way to ensure that the size of load_double_largeoffset 864 // does not depend on si20 (scratch buffer emit size == code buffer emit size for constant 865 // pool loads). 866 bool accumulate = true; 867 bool fixed_codelen = true; 868 Register work; 869 870 if (fixed_codelen) { 871 z_lgr(tmp, a); // Lgr_if_needed not applicable due to fixed_codelen. 872 } else { 873 accumulate = (a == tmp); 874 } 875 work = tmp; 876 877 int disp12 = split_largeoffset(si20, work, fixed_codelen, accumulate); 878 if (disp12 < 0) { 879 z_ld(t, si20, work); 880 } else { 881 if (accumulate) { 882 z_ld(t, disp12, work); 883 } else { 884 z_ld(t, disp12, work, a); 885 } 886 } 887 } 888 } 889 890 // PCrelative TOC access. 891 // Returns distance (in bytes) from current position to start of consts section. 892 // Returns 0 (zero) if no consts section exists or if it has size zero. 893 long MacroAssembler::toc_distance() { 894 CodeSection* cs = code()->consts(); 895 return (long)((cs != NULL) ? cs->start()-pc() : 0); 896 } 897 898 // Implementation on x86/sparc assumes that constant and instruction section are 899 // adjacent, but this doesn't hold. Two special situations may occur, that we must 900 // be able to handle: 901 // 1. const section may be located apart from the inst section. 902 // 2. const section may be empty 903 // In both cases, we use the const section's start address to compute the "TOC", 904 // this seems to occur only temporarily; in the final step we always seem to end up 905 // with the pc-relatice variant. 906 // 907 // PC-relative offset could be +/-2**32 -> use long for disp 908 // Furthermore: makes no sense to have special code for 909 // adjacent const and inst sections. 910 void MacroAssembler::load_toc(Register Rtoc) { 911 // Simply use distance from start of const section (should be patched in the end). 912 long disp = toc_distance(); 913 914 RelocationHolder rspec = internal_word_Relocation::spec(pc() + disp); 915 relocate(rspec); 916 z_larl(Rtoc, RelAddr::pcrel_off32(disp)); // Offset is in halfwords. 917 } 918 919 // PCrelative TOC access. 920 // Load from anywhere pcrelative (with relocation of load instr) 921 void MacroAssembler::load_long_pcrelative(Register Rdst, address dataLocation) { 922 address pc = this->pc(); 923 ptrdiff_t total_distance = dataLocation - pc; 924 RelocationHolder rspec = internal_word_Relocation::spec(dataLocation); 925 926 assert((total_distance & 0x01L) == 0, "halfword alignment is mandatory"); 927 assert(total_distance != 0, "sanity"); 928 929 // Some extra safety net. 930 if (!RelAddr::is_in_range_of_RelAddr32(total_distance)) { 931 guarantee(RelAddr::is_in_range_of_RelAddr32(total_distance), "load_long_pcrelative can't handle distance " INTPTR_FORMAT, total_distance); 932 } 933 934 (this)->relocate(rspec, relocInfo::pcrel_addr_format); 935 z_lgrl(Rdst, RelAddr::pcrel_off32(total_distance)); 936 } 937 938 939 // PCrelative TOC access. 940 // Load from anywhere pcrelative (with relocation of load instr) 941 // loaded addr has to be relocated when added to constant pool. 942 void MacroAssembler::load_addr_pcrelative(Register Rdst, address addrLocation) { 943 address pc = this->pc(); 944 ptrdiff_t total_distance = addrLocation - pc; 945 RelocationHolder rspec = internal_word_Relocation::spec(addrLocation); 946 947 assert((total_distance & 0x01L) == 0, "halfword alignment is mandatory"); 948 949 // Some extra safety net. 950 if (!RelAddr::is_in_range_of_RelAddr32(total_distance)) { 951 guarantee(RelAddr::is_in_range_of_RelAddr32(total_distance), "load_long_pcrelative can't handle distance " INTPTR_FORMAT, total_distance); 952 } 953 954 (this)->relocate(rspec, relocInfo::pcrel_addr_format); 955 z_lgrl(Rdst, RelAddr::pcrel_off32(total_distance)); 956 } 957 958 // Generic operation: load a value from memory and test. 959 // CondCode indicates the sign (<0, ==0, >0) of the loaded value. 960 void MacroAssembler::load_and_test_byte(Register dst, const Address &a) { 961 z_lb(dst, a); 962 z_ltr(dst, dst); 963 } 964 965 void MacroAssembler::load_and_test_short(Register dst, const Address &a) { 966 int64_t disp = a.disp20(); 967 if (Displacement::is_shortDisp(disp)) { 968 z_lh(dst, a); 969 } else if (Displacement::is_longDisp(disp)) { 970 z_lhy(dst, a); 971 } else { 972 guarantee(false, "displacement out of range"); 973 } 974 z_ltr(dst, dst); 975 } 976 977 void MacroAssembler::load_and_test_int(Register dst, const Address &a) { 978 z_lt(dst, a); 979 } 980 981 void MacroAssembler::load_and_test_int2long(Register dst, const Address &a) { 982 z_ltgf(dst, a); 983 } 984 985 void MacroAssembler::load_and_test_long(Register dst, const Address &a) { 986 z_ltg(dst, a); 987 } 988 989 // Test a bit in memory. 990 void MacroAssembler::testbit(const Address &a, unsigned int bit) { 991 assert(a.index() == noreg, "no index reg allowed in testbit"); 992 if (bit <= 7) { 993 z_tm(a.disp() + 3, a.base(), 1 << bit); 994 } else if (bit <= 15) { 995 z_tm(a.disp() + 2, a.base(), 1 << (bit - 8)); 996 } else if (bit <= 23) { 997 z_tm(a.disp() + 1, a.base(), 1 << (bit - 16)); 998 } else if (bit <= 31) { 999 z_tm(a.disp() + 0, a.base(), 1 << (bit - 24)); 1000 } else { 1001 ShouldNotReachHere(); 1002 } 1003 } 1004 1005 // Test a bit in a register. Result is reflected in CC. 1006 void MacroAssembler::testbit(Register r, unsigned int bitPos) { 1007 if (bitPos < 16) { 1008 z_tmll(r, 1U<<bitPos); 1009 } else if (bitPos < 32) { 1010 z_tmlh(r, 1U<<(bitPos-16)); 1011 } else if (bitPos < 48) { 1012 z_tmhl(r, 1U<<(bitPos-32)); 1013 } else if (bitPos < 64) { 1014 z_tmhh(r, 1U<<(bitPos-48)); 1015 } else { 1016 ShouldNotReachHere(); 1017 } 1018 } 1019 1020 void MacroAssembler::prefetch_read(Address a) { 1021 z_pfd(1, a.disp20(), a.indexOrR0(), a.base()); 1022 } 1023 void MacroAssembler::prefetch_update(Address a) { 1024 z_pfd(2, a.disp20(), a.indexOrR0(), a.base()); 1025 } 1026 1027 // Clear a register, i.e. load const zero into reg. 1028 // Return len (in bytes) of generated instruction(s). 1029 // whole_reg: Clear 64 bits if true, 32 bits otherwise. 1030 // set_cc: Use instruction that sets the condition code, if true. 1031 int MacroAssembler::clear_reg(Register r, bool whole_reg, bool set_cc) { 1032 unsigned int start_off = offset(); 1033 if (whole_reg) { 1034 set_cc ? z_xgr(r, r) : z_laz(r, 0, Z_R0); 1035 } else { // Only 32bit register. 1036 set_cc ? z_xr(r, r) : z_lhi(r, 0); 1037 } 1038 return offset() - start_off; 1039 } 1040 1041 #ifdef ASSERT 1042 int MacroAssembler::preset_reg(Register r, unsigned long pattern, int pattern_len) { 1043 switch (pattern_len) { 1044 case 1: 1045 pattern = (pattern & 0x000000ff) | ((pattern & 0x000000ff)<<8); 1046 case 2: 1047 pattern = (pattern & 0x0000ffff) | ((pattern & 0x0000ffff)<<16); 1048 case 4: 1049 pattern = (pattern & 0xffffffffL) | ((pattern & 0xffffffffL)<<32); 1050 case 8: 1051 return load_const_optimized_rtn_len(r, pattern, true); 1052 break; 1053 default: 1054 guarantee(false, "preset_reg: bad len"); 1055 } 1056 return 0; 1057 } 1058 #endif 1059 1060 // addr: Address descriptor of memory to clear index register will not be used ! 1061 // size: Number of bytes to clear. 1062 // !!! DO NOT USE THEM FOR ATOMIC MEMORY CLEARING !!! 1063 // !!! Use store_const() instead !!! 1064 void MacroAssembler::clear_mem(const Address& addr, unsigned size) { 1065 guarantee(size <= 256, "MacroAssembler::clear_mem: size too large"); 1066 1067 if (size == 1) { 1068 z_mvi(addr, 0); 1069 return; 1070 } 1071 1072 switch (size) { 1073 case 2: z_mvhhi(addr, 0); 1074 return; 1075 case 4: z_mvhi(addr, 0); 1076 return; 1077 case 8: z_mvghi(addr, 0); 1078 return; 1079 default: ; // Fallthru to xc. 1080 } 1081 1082 z_xc(addr, size, addr); 1083 } 1084 1085 void MacroAssembler::align(int modulus) { 1086 while (offset() % modulus != 0) z_nop(); 1087 } 1088 1089 // Special version for non-relocateable code if required alignment 1090 // is larger than CodeEntryAlignment. 1091 void MacroAssembler::align_address(int modulus) { 1092 while ((uintptr_t)pc() % modulus != 0) z_nop(); 1093 } 1094 1095 Address MacroAssembler::argument_address(RegisterOrConstant arg_slot, 1096 Register temp_reg, 1097 int64_t extra_slot_offset) { 1098 // On Z, we can have index and disp in an Address. So don't call argument_offset, 1099 // which issues an unnecessary add instruction. 1100 int stackElementSize = Interpreter::stackElementSize; 1101 int64_t offset = extra_slot_offset * stackElementSize; 1102 const Register argbase = Z_esp; 1103 if (arg_slot.is_constant()) { 1104 offset += arg_slot.as_constant() * stackElementSize; 1105 return Address(argbase, offset); 1106 } 1107 // else 1108 assert(temp_reg != noreg, "must specify"); 1109 assert(temp_reg != Z_ARG1, "base and index are conflicting"); 1110 z_sllg(temp_reg, arg_slot.as_register(), exact_log2(stackElementSize)); // tempreg = arg_slot << 3 1111 return Address(argbase, temp_reg, offset); 1112 } 1113 1114 1115 //=================================================================== 1116 //=== START C O N S T A N T S I N C O D E S T R E A M === 1117 //=================================================================== 1118 //=== P A T CH A B L E C O N S T A N T S === 1119 //=================================================================== 1120 1121 1122 //--------------------------------------------------- 1123 // Load (patchable) constant into register 1124 //--------------------------------------------------- 1125 1126 1127 // Load absolute address (and try to optimize). 1128 // Note: This method is usable only for position-fixed code, 1129 // referring to a position-fixed target location. 1130 // If not so, relocations and patching must be used. 1131 void MacroAssembler::load_absolute_address(Register d, address addr) { 1132 assert(addr != NULL, "should not happen"); 1133 BLOCK_COMMENT("load_absolute_address:"); 1134 if (addr == NULL) { 1135 z_larl(d, pc()); // Dummy emit for size calc. 1136 return; 1137 } 1138 1139 if (RelAddr::is_in_range_of_RelAddr32(addr, pc())) { 1140 z_larl(d, addr); 1141 return; 1142 } 1143 1144 load_const_optimized(d, (long)addr); 1145 } 1146 1147 // Load a 64bit constant. 1148 // Patchable code sequence, but not atomically patchable. 1149 // Make sure to keep code size constant -> no value-dependent optimizations. 1150 // Do not kill condition code. 1151 void MacroAssembler::load_const(Register t, long x) { 1152 // Note: Right shift is only cleanly defined for unsigned types 1153 // or for signed types with nonnegative values. 1154 Assembler::z_iihf(t, (long)((unsigned long)x >> 32)); 1155 Assembler::z_iilf(t, (long)((unsigned long)x & 0xffffffffUL)); 1156 } 1157 1158 // Load a 32bit constant into a 64bit register, sign-extend or zero-extend. 1159 // Patchable code sequence, but not atomically patchable. 1160 // Make sure to keep code size constant -> no value-dependent optimizations. 1161 // Do not kill condition code. 1162 void MacroAssembler::load_const_32to64(Register t, int64_t x, bool sign_extend) { 1163 if (sign_extend) { Assembler::z_lgfi(t, x); } 1164 else { Assembler::z_llilf(t, x); } 1165 } 1166 1167 // Load narrow oop constant, no decompression. 1168 void MacroAssembler::load_narrow_oop(Register t, narrowOop a) { 1169 assert(UseCompressedOops, "must be on to call this method"); 1170 load_const_32to64(t, a, false /*sign_extend*/); 1171 } 1172 1173 // Load narrow klass constant, compression required. 1174 void MacroAssembler::load_narrow_klass(Register t, Klass* k) { 1175 assert(UseCompressedClassPointers, "must be on to call this method"); 1176 narrowKlass encoded_k = CompressedKlassPointers::encode(k); 1177 load_const_32to64(t, encoded_k, false /*sign_extend*/); 1178 } 1179 1180 //------------------------------------------------------ 1181 // Compare (patchable) constant with register. 1182 //------------------------------------------------------ 1183 1184 // Compare narrow oop in reg with narrow oop constant, no decompression. 1185 void MacroAssembler::compare_immediate_narrow_oop(Register oop1, narrowOop oop2) { 1186 assert(UseCompressedOops, "must be on to call this method"); 1187 1188 Assembler::z_clfi(oop1, oop2); 1189 } 1190 1191 // Compare narrow oop in reg with narrow oop constant, no decompression. 1192 void MacroAssembler::compare_immediate_narrow_klass(Register klass1, Klass* klass2) { 1193 assert(UseCompressedClassPointers, "must be on to call this method"); 1194 narrowKlass encoded_k = CompressedKlassPointers::encode(klass2); 1195 1196 Assembler::z_clfi(klass1, encoded_k); 1197 } 1198 1199 //---------------------------------------------------------- 1200 // Check which kind of load_constant we have here. 1201 //---------------------------------------------------------- 1202 1203 // Detection of CPU version dependent load_const sequence. 1204 // The detection is valid only for code sequences generated by load_const, 1205 // not load_const_optimized. 1206 bool MacroAssembler::is_load_const(address a) { 1207 unsigned long inst1, inst2; 1208 unsigned int len1, len2; 1209 1210 len1 = get_instruction(a, &inst1); 1211 len2 = get_instruction(a + len1, &inst2); 1212 1213 return is_z_iihf(inst1) && is_z_iilf(inst2); 1214 } 1215 1216 // Detection of CPU version dependent load_const_32to64 sequence. 1217 // Mostly used for narrow oops and narrow Klass pointers. 1218 // The detection is valid only for code sequences generated by load_const_32to64. 1219 bool MacroAssembler::is_load_const_32to64(address pos) { 1220 unsigned long inst1, inst2; 1221 unsigned int len1; 1222 1223 len1 = get_instruction(pos, &inst1); 1224 return is_z_llilf(inst1); 1225 } 1226 1227 // Detection of compare_immediate_narrow sequence. 1228 // The detection is valid only for code sequences generated by compare_immediate_narrow_oop. 1229 bool MacroAssembler::is_compare_immediate32(address pos) { 1230 return is_equal(pos, CLFI_ZOPC, RIL_MASK); 1231 } 1232 1233 // Detection of compare_immediate_narrow sequence. 1234 // The detection is valid only for code sequences generated by compare_immediate_narrow_oop. 1235 bool MacroAssembler::is_compare_immediate_narrow_oop(address pos) { 1236 return is_compare_immediate32(pos); 1237 } 1238 1239 // Detection of compare_immediate_narrow sequence. 1240 // The detection is valid only for code sequences generated by compare_immediate_narrow_klass. 1241 bool MacroAssembler::is_compare_immediate_narrow_klass(address pos) { 1242 return is_compare_immediate32(pos); 1243 } 1244 1245 //----------------------------------- 1246 // patch the load_constant 1247 //----------------------------------- 1248 1249 // CPU-version dependend patching of load_const. 1250 void MacroAssembler::patch_const(address a, long x) { 1251 assert(is_load_const(a), "not a load of a constant"); 1252 // Note: Right shift is only cleanly defined for unsigned types 1253 // or for signed types with nonnegative values. 1254 set_imm32((address)a, (long)((unsigned long)x >> 32)); 1255 set_imm32((address)(a + 6), (long)((unsigned long)x & 0xffffffffUL)); 1256 } 1257 1258 // Patching the value of CPU version dependent load_const_32to64 sequence. 1259 // The passed ptr MUST be in compressed format! 1260 int MacroAssembler::patch_load_const_32to64(address pos, int64_t np) { 1261 assert(is_load_const_32to64(pos), "not a load of a narrow ptr (oop or klass)"); 1262 1263 set_imm32(pos, np); 1264 return 6; 1265 } 1266 1267 // Patching the value of CPU version dependent compare_immediate_narrow sequence. 1268 // The passed ptr MUST be in compressed format! 1269 int MacroAssembler::patch_compare_immediate_32(address pos, int64_t np) { 1270 assert(is_compare_immediate32(pos), "not a compressed ptr compare"); 1271 1272 set_imm32(pos, np); 1273 return 6; 1274 } 1275 1276 // Patching the immediate value of CPU version dependent load_narrow_oop sequence. 1277 // The passed ptr must NOT be in compressed format! 1278 int MacroAssembler::patch_load_narrow_oop(address pos, oop o) { 1279 assert(UseCompressedOops, "Can only patch compressed oops"); 1280 1281 narrowOop no = CompressedOops::encode(o); 1282 return patch_load_const_32to64(pos, no); 1283 } 1284 1285 // Patching the immediate value of CPU version dependent load_narrow_klass sequence. 1286 // The passed ptr must NOT be in compressed format! 1287 int MacroAssembler::patch_load_narrow_klass(address pos, Klass* k) { 1288 assert(UseCompressedClassPointers, "Can only patch compressed klass pointers"); 1289 1290 narrowKlass nk = CompressedKlassPointers::encode(k); 1291 return patch_load_const_32to64(pos, nk); 1292 } 1293 1294 // Patching the immediate value of CPU version dependent compare_immediate_narrow_oop sequence. 1295 // The passed ptr must NOT be in compressed format! 1296 int MacroAssembler::patch_compare_immediate_narrow_oop(address pos, oop o) { 1297 assert(UseCompressedOops, "Can only patch compressed oops"); 1298 1299 narrowOop no = CompressedOops::encode(o); 1300 return patch_compare_immediate_32(pos, no); 1301 } 1302 1303 // Patching the immediate value of CPU version dependent compare_immediate_narrow_klass sequence. 1304 // The passed ptr must NOT be in compressed format! 1305 int MacroAssembler::patch_compare_immediate_narrow_klass(address pos, Klass* k) { 1306 assert(UseCompressedClassPointers, "Can only patch compressed klass pointers"); 1307 1308 narrowKlass nk = CompressedKlassPointers::encode(k); 1309 return patch_compare_immediate_32(pos, nk); 1310 } 1311 1312 //------------------------------------------------------------------------ 1313 // Extract the constant from a load_constant instruction stream. 1314 //------------------------------------------------------------------------ 1315 1316 // Get constant from a load_const sequence. 1317 long MacroAssembler::get_const(address a) { 1318 assert(is_load_const(a), "not a load of a constant"); 1319 unsigned long x; 1320 x = (((unsigned long) (get_imm32(a,0) & 0xffffffff)) << 32); 1321 x |= (((unsigned long) (get_imm32(a,1) & 0xffffffff))); 1322 return (long) x; 1323 } 1324 1325 //-------------------------------------- 1326 // Store a constant in memory. 1327 //-------------------------------------- 1328 1329 // General emitter to move a constant to memory. 1330 // The store is atomic. 1331 // o Address must be given in RS format (no index register) 1332 // o Displacement should be 12bit unsigned for efficiency. 20bit signed also supported. 1333 // o Constant can be 1, 2, 4, or 8 bytes, signed or unsigned. 1334 // o Memory slot can be 1, 2, 4, or 8 bytes, signed or unsigned. 1335 // o Memory slot must be at least as wide as constant, will assert otherwise. 1336 // o Signed constants will sign-extend, unsigned constants will zero-extend to slot width. 1337 int MacroAssembler::store_const(const Address &dest, long imm, 1338 unsigned int lm, unsigned int lc, 1339 Register scratch) { 1340 int64_t disp = dest.disp(); 1341 Register base = dest.base(); 1342 assert(!dest.has_index(), "not supported"); 1343 assert((lm==1)||(lm==2)||(lm==4)||(lm==8), "memory length not supported"); 1344 assert((lc==1)||(lc==2)||(lc==4)||(lc==8), "constant length not supported"); 1345 assert(lm>=lc, "memory slot too small"); 1346 assert(lc==8 || Immediate::is_simm(imm, lc*8), "const out of range"); 1347 assert(Displacement::is_validDisp(disp), "displacement out of range"); 1348 1349 bool is_shortDisp = Displacement::is_shortDisp(disp); 1350 int store_offset = -1; 1351 1352 // For target len == 1 it's easy. 1353 if (lm == 1) { 1354 store_offset = offset(); 1355 if (is_shortDisp) { 1356 z_mvi(disp, base, imm); 1357 return store_offset; 1358 } else { 1359 z_mviy(disp, base, imm); 1360 return store_offset; 1361 } 1362 } 1363 1364 // All the "good stuff" takes an unsigned displacement. 1365 if (is_shortDisp) { 1366 // NOTE: Cannot use clear_mem for imm==0, because it is not atomic. 1367 1368 store_offset = offset(); 1369 switch (lm) { 1370 case 2: // Lc == 1 handled correctly here, even for unsigned. Instruction does no widening. 1371 z_mvhhi(disp, base, imm); 1372 return store_offset; 1373 case 4: 1374 if (Immediate::is_simm16(imm)) { 1375 z_mvhi(disp, base, imm); 1376 return store_offset; 1377 } 1378 break; 1379 case 8: 1380 if (Immediate::is_simm16(imm)) { 1381 z_mvghi(disp, base, imm); 1382 return store_offset; 1383 } 1384 break; 1385 default: 1386 ShouldNotReachHere(); 1387 break; 1388 } 1389 } 1390 1391 // Can't optimize, so load value and store it. 1392 guarantee(scratch != noreg, " need a scratch register here !"); 1393 if (imm != 0) { 1394 load_const_optimized(scratch, imm); // Preserves CC anyway. 1395 } else { 1396 // Leave CC alone!! 1397 (void) clear_reg(scratch, true, false); // Indicate unused result. 1398 } 1399 1400 store_offset = offset(); 1401 if (is_shortDisp) { 1402 switch (lm) { 1403 case 2: 1404 z_sth(scratch, disp, Z_R0, base); 1405 return store_offset; 1406 case 4: 1407 z_st(scratch, disp, Z_R0, base); 1408 return store_offset; 1409 case 8: 1410 z_stg(scratch, disp, Z_R0, base); 1411 return store_offset; 1412 default: 1413 ShouldNotReachHere(); 1414 break; 1415 } 1416 } else { 1417 switch (lm) { 1418 case 2: 1419 z_sthy(scratch, disp, Z_R0, base); 1420 return store_offset; 1421 case 4: 1422 z_sty(scratch, disp, Z_R0, base); 1423 return store_offset; 1424 case 8: 1425 z_stg(scratch, disp, Z_R0, base); 1426 return store_offset; 1427 default: 1428 ShouldNotReachHere(); 1429 break; 1430 } 1431 } 1432 return -1; // should not reach here 1433 } 1434 1435 //=================================================================== 1436 //=== N O T P A T CH A B L E C O N S T A N T S === 1437 //=================================================================== 1438 1439 // Load constant x into register t with a fast instrcution sequence 1440 // depending on the bits in x. Preserves CC under all circumstances. 1441 int MacroAssembler::load_const_optimized_rtn_len(Register t, long x, bool emit) { 1442 if (x == 0) { 1443 int len; 1444 if (emit) { 1445 len = clear_reg(t, true, false); 1446 } else { 1447 len = 4; 1448 } 1449 return len; 1450 } 1451 1452 if (Immediate::is_simm16(x)) { 1453 if (emit) { z_lghi(t, x); } 1454 return 4; 1455 } 1456 1457 // 64 bit value: | part1 | part2 | part3 | part4 | 1458 // At least one part is not zero! 1459 // Note: Right shift is only cleanly defined for unsigned types 1460 // or for signed types with nonnegative values. 1461 int part1 = (int)((unsigned long)x >> 48) & 0x0000ffff; 1462 int part2 = (int)((unsigned long)x >> 32) & 0x0000ffff; 1463 int part3 = (int)((unsigned long)x >> 16) & 0x0000ffff; 1464 int part4 = (int)x & 0x0000ffff; 1465 int part12 = (int)((unsigned long)x >> 32); 1466 int part34 = (int)x; 1467 1468 // Lower word only (unsigned). 1469 if (part12 == 0) { 1470 if (part3 == 0) { 1471 if (emit) z_llill(t, part4); 1472 return 4; 1473 } 1474 if (part4 == 0) { 1475 if (emit) z_llilh(t, part3); 1476 return 4; 1477 } 1478 if (emit) z_llilf(t, part34); 1479 return 6; 1480 } 1481 1482 // Upper word only. 1483 if (part34 == 0) { 1484 if (part1 == 0) { 1485 if (emit) z_llihl(t, part2); 1486 return 4; 1487 } 1488 if (part2 == 0) { 1489 if (emit) z_llihh(t, part1); 1490 return 4; 1491 } 1492 if (emit) z_llihf(t, part12); 1493 return 6; 1494 } 1495 1496 // Lower word only (signed). 1497 if ((part1 == 0x0000ffff) && (part2 == 0x0000ffff) && ((part3 & 0x00008000) != 0)) { 1498 if (emit) z_lgfi(t, part34); 1499 return 6; 1500 } 1501 1502 int len = 0; 1503 1504 if ((part1 == 0) || (part2 == 0)) { 1505 if (part1 == 0) { 1506 if (emit) z_llihl(t, part2); 1507 len += 4; 1508 } else { 1509 if (emit) z_llihh(t, part1); 1510 len += 4; 1511 } 1512 } else { 1513 if (emit) z_llihf(t, part12); 1514 len += 6; 1515 } 1516 1517 if ((part3 == 0) || (part4 == 0)) { 1518 if (part3 == 0) { 1519 if (emit) z_iill(t, part4); 1520 len += 4; 1521 } else { 1522 if (emit) z_iilh(t, part3); 1523 len += 4; 1524 } 1525 } else { 1526 if (emit) z_iilf(t, part34); 1527 len += 6; 1528 } 1529 return len; 1530 } 1531 1532 //===================================================================== 1533 //=== H I G H E R L E V E L B R A N C H E M I T T E R S === 1534 //===================================================================== 1535 1536 // Note: In the worst case, one of the scratch registers is destroyed!!! 1537 void MacroAssembler::compare32_and_branch(Register r1, RegisterOrConstant x2, branch_condition cond, Label& lbl) { 1538 // Right operand is constant. 1539 if (x2.is_constant()) { 1540 jlong value = x2.as_constant(); 1541 compare_and_branch_optimized(r1, value, cond, lbl, /*len64=*/false, /*has_sign=*/true); 1542 return; 1543 } 1544 1545 // Right operand is in register. 1546 compare_and_branch_optimized(r1, x2.as_register(), cond, lbl, /*len64=*/false, /*has_sign=*/true); 1547 } 1548 1549 // Note: In the worst case, one of the scratch registers is destroyed!!! 1550 void MacroAssembler::compareU32_and_branch(Register r1, RegisterOrConstant x2, branch_condition cond, Label& lbl) { 1551 // Right operand is constant. 1552 if (x2.is_constant()) { 1553 jlong value = x2.as_constant(); 1554 compare_and_branch_optimized(r1, value, cond, lbl, /*len64=*/false, /*has_sign=*/false); 1555 return; 1556 } 1557 1558 // Right operand is in register. 1559 compare_and_branch_optimized(r1, x2.as_register(), cond, lbl, /*len64=*/false, /*has_sign=*/false); 1560 } 1561 1562 // Note: In the worst case, one of the scratch registers is destroyed!!! 1563 void MacroAssembler::compare64_and_branch(Register r1, RegisterOrConstant x2, branch_condition cond, Label& lbl) { 1564 // Right operand is constant. 1565 if (x2.is_constant()) { 1566 jlong value = x2.as_constant(); 1567 compare_and_branch_optimized(r1, value, cond, lbl, /*len64=*/true, /*has_sign=*/true); 1568 return; 1569 } 1570 1571 // Right operand is in register. 1572 compare_and_branch_optimized(r1, x2.as_register(), cond, lbl, /*len64=*/true, /*has_sign=*/true); 1573 } 1574 1575 void MacroAssembler::compareU64_and_branch(Register r1, RegisterOrConstant x2, branch_condition cond, Label& lbl) { 1576 // Right operand is constant. 1577 if (x2.is_constant()) { 1578 jlong value = x2.as_constant(); 1579 compare_and_branch_optimized(r1, value, cond, lbl, /*len64=*/true, /*has_sign=*/false); 1580 return; 1581 } 1582 1583 // Right operand is in register. 1584 compare_and_branch_optimized(r1, x2.as_register(), cond, lbl, /*len64=*/true, /*has_sign=*/false); 1585 } 1586 1587 // Generate an optimal branch to the branch target. 1588 // Optimal means that a relative branch (brc or brcl) is used if the 1589 // branch distance is short enough. Loading the target address into a 1590 // register and branching via reg is used as fallback only. 1591 // 1592 // Used registers: 1593 // Z_R1 - work reg. Holds branch target address. 1594 // Used in fallback case only. 1595 // 1596 // This version of branch_optimized is good for cases where the target address is known 1597 // and constant, i.e. is never changed (no relocation, no patching). 1598 void MacroAssembler::branch_optimized(Assembler::branch_condition cond, address branch_addr) { 1599 address branch_origin = pc(); 1600 1601 if (RelAddr::is_in_range_of_RelAddr16(branch_addr, branch_origin)) { 1602 z_brc(cond, branch_addr); 1603 } else if (RelAddr::is_in_range_of_RelAddr32(branch_addr, branch_origin)) { 1604 z_brcl(cond, branch_addr); 1605 } else { 1606 load_const_optimized(Z_R1, branch_addr); // CC must not get killed by load_const_optimized. 1607 z_bcr(cond, Z_R1); 1608 } 1609 } 1610 1611 // This version of branch_optimized is good for cases where the target address 1612 // is potentially not yet known at the time the code is emitted. 1613 // 1614 // One very common case is a branch to an unbound label which is handled here. 1615 // The caller might know (or hope) that the branch distance is short enough 1616 // to be encoded in a 16bit relative address. In this case he will pass a 1617 // NearLabel branch_target. 1618 // Care must be taken with unbound labels. Each call to target(label) creates 1619 // an entry in the patch queue for that label to patch all references of the label 1620 // once it gets bound. Those recorded patch locations must be patchable. Otherwise, 1621 // an assertion fires at patch time. 1622 void MacroAssembler::branch_optimized(Assembler::branch_condition cond, Label& branch_target) { 1623 if (branch_target.is_bound()) { 1624 address branch_addr = target(branch_target); 1625 branch_optimized(cond, branch_addr); 1626 } else if (branch_target.is_near()) { 1627 z_brc(cond, branch_target); // Caller assures that the target will be in range for z_brc. 1628 } else { 1629 z_brcl(cond, branch_target); // Let's hope target is in range. Otherwise, we will abort at patch time. 1630 } 1631 } 1632 1633 // Generate an optimal compare and branch to the branch target. 1634 // Optimal means that a relative branch (clgrj, brc or brcl) is used if the 1635 // branch distance is short enough. Loading the target address into a 1636 // register and branching via reg is used as fallback only. 1637 // 1638 // Input: 1639 // r1 - left compare operand 1640 // r2 - right compare operand 1641 void MacroAssembler::compare_and_branch_optimized(Register r1, 1642 Register r2, 1643 Assembler::branch_condition cond, 1644 address branch_addr, 1645 bool len64, 1646 bool has_sign) { 1647 unsigned int casenum = (len64?2:0)+(has_sign?0:1); 1648 1649 address branch_origin = pc(); 1650 if (VM_Version::has_CompareBranch() && RelAddr::is_in_range_of_RelAddr16(branch_addr, branch_origin)) { 1651 switch (casenum) { 1652 case 0: z_crj( r1, r2, cond, branch_addr); break; 1653 case 1: z_clrj (r1, r2, cond, branch_addr); break; 1654 case 2: z_cgrj(r1, r2, cond, branch_addr); break; 1655 case 3: z_clgrj(r1, r2, cond, branch_addr); break; 1656 default: ShouldNotReachHere(); break; 1657 } 1658 } else { 1659 switch (casenum) { 1660 case 0: z_cr( r1, r2); break; 1661 case 1: z_clr(r1, r2); break; 1662 case 2: z_cgr(r1, r2); break; 1663 case 3: z_clgr(r1, r2); break; 1664 default: ShouldNotReachHere(); break; 1665 } 1666 branch_optimized(cond, branch_addr); 1667 } 1668 } 1669 1670 // Generate an optimal compare and branch to the branch target. 1671 // Optimal means that a relative branch (clgij, brc or brcl) is used if the 1672 // branch distance is short enough. Loading the target address into a 1673 // register and branching via reg is used as fallback only. 1674 // 1675 // Input: 1676 // r1 - left compare operand (in register) 1677 // x2 - right compare operand (immediate) 1678 void MacroAssembler::compare_and_branch_optimized(Register r1, 1679 jlong x2, 1680 Assembler::branch_condition cond, 1681 Label& branch_target, 1682 bool len64, 1683 bool has_sign) { 1684 address branch_origin = pc(); 1685 bool x2_imm8 = (has_sign && Immediate::is_simm8(x2)) || (!has_sign && Immediate::is_uimm8(x2)); 1686 bool is_RelAddr16 = branch_target.is_near() || 1687 (branch_target.is_bound() && 1688 RelAddr::is_in_range_of_RelAddr16(target(branch_target), branch_origin)); 1689 unsigned int casenum = (len64?2:0)+(has_sign?0:1); 1690 1691 if (VM_Version::has_CompareBranch() && is_RelAddr16 && x2_imm8) { 1692 switch (casenum) { 1693 case 0: z_cij( r1, x2, cond, branch_target); break; 1694 case 1: z_clij(r1, x2, cond, branch_target); break; 1695 case 2: z_cgij(r1, x2, cond, branch_target); break; 1696 case 3: z_clgij(r1, x2, cond, branch_target); break; 1697 default: ShouldNotReachHere(); break; 1698 } 1699 return; 1700 } 1701 1702 if (x2 == 0) { 1703 switch (casenum) { 1704 case 0: z_ltr(r1, r1); break; 1705 case 1: z_ltr(r1, r1); break; // Caution: unsigned test only provides zero/notZero indication! 1706 case 2: z_ltgr(r1, r1); break; 1707 case 3: z_ltgr(r1, r1); break; // Caution: unsigned test only provides zero/notZero indication! 1708 default: ShouldNotReachHere(); break; 1709 } 1710 } else { 1711 if ((has_sign && Immediate::is_simm16(x2)) || (!has_sign && Immediate::is_uimm(x2, 15))) { 1712 switch (casenum) { 1713 case 0: z_chi(r1, x2); break; 1714 case 1: z_chi(r1, x2); break; // positive immediate < 2**15 1715 case 2: z_cghi(r1, x2); break; 1716 case 3: z_cghi(r1, x2); break; // positive immediate < 2**15 1717 default: break; 1718 } 1719 } else if ( (has_sign && Immediate::is_simm32(x2)) || (!has_sign && Immediate::is_uimm32(x2)) ) { 1720 switch (casenum) { 1721 case 0: z_cfi( r1, x2); break; 1722 case 1: z_clfi(r1, x2); break; 1723 case 2: z_cgfi(r1, x2); break; 1724 case 3: z_clgfi(r1, x2); break; 1725 default: ShouldNotReachHere(); break; 1726 } 1727 } else { 1728 // No instruction with immediate operand possible, so load into register. 1729 Register scratch = (r1 != Z_R0) ? Z_R0 : Z_R1; 1730 load_const_optimized(scratch, x2); 1731 switch (casenum) { 1732 case 0: z_cr( r1, scratch); break; 1733 case 1: z_clr(r1, scratch); break; 1734 case 2: z_cgr(r1, scratch); break; 1735 case 3: z_clgr(r1, scratch); break; 1736 default: ShouldNotReachHere(); break; 1737 } 1738 } 1739 } 1740 branch_optimized(cond, branch_target); 1741 } 1742 1743 // Generate an optimal compare and branch to the branch target. 1744 // Optimal means that a relative branch (clgrj, brc or brcl) is used if the 1745 // branch distance is short enough. Loading the target address into a 1746 // register and branching via reg is used as fallback only. 1747 // 1748 // Input: 1749 // r1 - left compare operand 1750 // r2 - right compare operand 1751 void MacroAssembler::compare_and_branch_optimized(Register r1, 1752 Register r2, 1753 Assembler::branch_condition cond, 1754 Label& branch_target, 1755 bool len64, 1756 bool has_sign) { 1757 unsigned int casenum = (len64 ? 2 : 0) + (has_sign ? 0 : 1); 1758 1759 if (branch_target.is_bound()) { 1760 address branch_addr = target(branch_target); 1761 compare_and_branch_optimized(r1, r2, cond, branch_addr, len64, has_sign); 1762 } else { 1763 if (VM_Version::has_CompareBranch() && branch_target.is_near()) { 1764 switch (casenum) { 1765 case 0: z_crj( r1, r2, cond, branch_target); break; 1766 case 1: z_clrj( r1, r2, cond, branch_target); break; 1767 case 2: z_cgrj( r1, r2, cond, branch_target); break; 1768 case 3: z_clgrj(r1, r2, cond, branch_target); break; 1769 default: ShouldNotReachHere(); break; 1770 } 1771 } else { 1772 switch (casenum) { 1773 case 0: z_cr( r1, r2); break; 1774 case 1: z_clr(r1, r2); break; 1775 case 2: z_cgr(r1, r2); break; 1776 case 3: z_clgr(r1, r2); break; 1777 default: ShouldNotReachHere(); break; 1778 } 1779 branch_optimized(cond, branch_target); 1780 } 1781 } 1782 } 1783 1784 //=========================================================================== 1785 //=== END H I G H E R L E V E L B R A N C H E M I T T E R S === 1786 //=========================================================================== 1787 1788 AddressLiteral MacroAssembler::allocate_metadata_address(Metadata* obj) { 1789 assert(oop_recorder() != NULL, "this assembler needs an OopRecorder"); 1790 int index = oop_recorder()->allocate_metadata_index(obj); 1791 RelocationHolder rspec = metadata_Relocation::spec(index); 1792 return AddressLiteral((address)obj, rspec); 1793 } 1794 1795 AddressLiteral MacroAssembler::constant_metadata_address(Metadata* obj) { 1796 assert(oop_recorder() != NULL, "this assembler needs an OopRecorder"); 1797 int index = oop_recorder()->find_index(obj); 1798 RelocationHolder rspec = metadata_Relocation::spec(index); 1799 return AddressLiteral((address)obj, rspec); 1800 } 1801 1802 AddressLiteral MacroAssembler::allocate_oop_address(jobject obj) { 1803 assert(oop_recorder() != NULL, "this assembler needs an OopRecorder"); 1804 int oop_index = oop_recorder()->allocate_oop_index(obj); 1805 return AddressLiteral(address(obj), oop_Relocation::spec(oop_index)); 1806 } 1807 1808 AddressLiteral MacroAssembler::constant_oop_address(jobject obj) { 1809 assert(oop_recorder() != NULL, "this assembler needs an OopRecorder"); 1810 int oop_index = oop_recorder()->find_index(obj); 1811 return AddressLiteral(address(obj), oop_Relocation::spec(oop_index)); 1812 } 1813 1814 // NOTE: destroys r 1815 void MacroAssembler::c2bool(Register r, Register t) { 1816 z_lcr(t, r); // t = -r 1817 z_or(r, t); // r = -r OR r 1818 z_srl(r, 31); // Yields 0 if r was 0, 1 otherwise. 1819 } 1820 1821 RegisterOrConstant MacroAssembler::delayed_value_impl(intptr_t* delayed_value_addr, 1822 Register tmp, 1823 int offset) { 1824 intptr_t value = *delayed_value_addr; 1825 if (value != 0) { 1826 return RegisterOrConstant(value + offset); 1827 } 1828 1829 BLOCK_COMMENT("delayed_value {"); 1830 // Load indirectly to solve generation ordering problem. 1831 load_absolute_address(tmp, (address) delayed_value_addr); // tmp = a; 1832 z_lg(tmp, 0, tmp); // tmp = *tmp; 1833 1834 #ifdef ASSERT 1835 NearLabel L; 1836 compare64_and_branch(tmp, (intptr_t)0L, Assembler::bcondNotEqual, L); 1837 z_illtrap(); 1838 bind(L); 1839 #endif 1840 1841 if (offset != 0) { 1842 z_agfi(tmp, offset); // tmp = tmp + offset; 1843 } 1844 1845 BLOCK_COMMENT("} delayed_value"); 1846 return RegisterOrConstant(tmp); 1847 } 1848 1849 // Patch instruction `inst' at offset `inst_pos' to refer to `dest_pos' 1850 // and return the resulting instruction. 1851 // Dest_pos and inst_pos are 32 bit only. These parms can only designate 1852 // relative positions. 1853 // Use correct argument types. Do not pre-calculate distance. 1854 unsigned long MacroAssembler::patched_branch(address dest_pos, unsigned long inst, address inst_pos) { 1855 int c = 0; 1856 unsigned long patched_inst = 0; 1857 if (is_call_pcrelative_short(inst) || 1858 is_branch_pcrelative_short(inst) || 1859 is_branchoncount_pcrelative_short(inst) || 1860 is_branchonindex32_pcrelative_short(inst)) { 1861 c = 1; 1862 int m = fmask(15, 0); // simm16(-1, 16, 32); 1863 int v = simm16(RelAddr::pcrel_off16(dest_pos, inst_pos), 16, 32); 1864 patched_inst = (inst & ~m) | v; 1865 } else if (is_compareandbranch_pcrelative_short(inst)) { 1866 c = 2; 1867 long m = fmask(31, 16); // simm16(-1, 16, 48); 1868 long v = simm16(RelAddr::pcrel_off16(dest_pos, inst_pos), 16, 48); 1869 patched_inst = (inst & ~m) | v; 1870 } else if (is_branchonindex64_pcrelative_short(inst)) { 1871 c = 3; 1872 long m = fmask(31, 16); // simm16(-1, 16, 48); 1873 long v = simm16(RelAddr::pcrel_off16(dest_pos, inst_pos), 16, 48); 1874 patched_inst = (inst & ~m) | v; 1875 } else if (is_call_pcrelative_long(inst) || is_branch_pcrelative_long(inst)) { 1876 c = 4; 1877 long m = fmask(31, 0); // simm32(-1, 16, 48); 1878 long v = simm32(RelAddr::pcrel_off32(dest_pos, inst_pos), 16, 48); 1879 patched_inst = (inst & ~m) | v; 1880 } else if (is_pcrelative_long(inst)) { // These are the non-branch pc-relative instructions. 1881 c = 5; 1882 long m = fmask(31, 0); // simm32(-1, 16, 48); 1883 long v = simm32(RelAddr::pcrel_off32(dest_pos, inst_pos), 16, 48); 1884 patched_inst = (inst & ~m) | v; 1885 } else { 1886 print_dbg_msg(tty, inst, "not a relative branch", 0); 1887 dump_code_range(tty, inst_pos, 32, "not a pcrelative branch"); 1888 ShouldNotReachHere(); 1889 } 1890 1891 long new_off = get_pcrel_offset(patched_inst); 1892 if (new_off != (dest_pos-inst_pos)) { 1893 tty->print_cr("case %d: dest_pos = %p, inst_pos = %p, disp = %ld(%12.12lx)", c, dest_pos, inst_pos, new_off, new_off); 1894 print_dbg_msg(tty, inst, "<- original instruction: branch patching error", 0); 1895 print_dbg_msg(tty, patched_inst, "<- patched instruction: branch patching error", 0); 1896 #ifdef LUCY_DBG 1897 VM_Version::z_SIGSEGV(); 1898 #endif 1899 ShouldNotReachHere(); 1900 } 1901 return patched_inst; 1902 } 1903 1904 // Only called when binding labels (share/vm/asm/assembler.cpp) 1905 // Pass arguments as intended. Do not pre-calculate distance. 1906 void MacroAssembler::pd_patch_instruction(address branch, address target, const char* file, int line) { 1907 unsigned long stub_inst; 1908 int inst_len = get_instruction(branch, &stub_inst); 1909 1910 set_instruction(branch, patched_branch(target, stub_inst, branch), inst_len); 1911 } 1912 1913 1914 // Extract relative address (aka offset). 1915 // inv_simm16 works for 4-byte instructions only. 1916 // compare and branch instructions are 6-byte and have a 16bit offset "in the middle". 1917 long MacroAssembler::get_pcrel_offset(unsigned long inst) { 1918 1919 if (MacroAssembler::is_pcrelative_short(inst)) { 1920 if (((inst&0xFFFFffff00000000UL) == 0) && ((inst&0x00000000FFFF0000UL) != 0)) { 1921 return RelAddr::inv_pcrel_off16(inv_simm16(inst)); 1922 } else { 1923 return RelAddr::inv_pcrel_off16(inv_simm16_48(inst)); 1924 } 1925 } 1926 1927 if (MacroAssembler::is_pcrelative_long(inst)) { 1928 return RelAddr::inv_pcrel_off32(inv_simm32(inst)); 1929 } 1930 1931 print_dbg_msg(tty, inst, "not a pcrelative instruction", 6); 1932 #ifdef LUCY_DBG 1933 VM_Version::z_SIGSEGV(); 1934 #else 1935 ShouldNotReachHere(); 1936 #endif 1937 return -1; 1938 } 1939 1940 long MacroAssembler::get_pcrel_offset(address pc) { 1941 unsigned long inst; 1942 unsigned int len = get_instruction(pc, &inst); 1943 1944 #ifdef ASSERT 1945 long offset; 1946 if (MacroAssembler::is_pcrelative_short(inst) || MacroAssembler::is_pcrelative_long(inst)) { 1947 offset = get_pcrel_offset(inst); 1948 } else { 1949 offset = -1; 1950 } 1951 1952 if (offset == -1) { 1953 dump_code_range(tty, pc, 32, "not a pcrelative instruction"); 1954 #ifdef LUCY_DBG 1955 VM_Version::z_SIGSEGV(); 1956 #else 1957 ShouldNotReachHere(); 1958 #endif 1959 } 1960 return offset; 1961 #else 1962 return get_pcrel_offset(inst); 1963 #endif // ASSERT 1964 } 1965 1966 // Get target address from pc-relative instructions. 1967 address MacroAssembler::get_target_addr_pcrel(address pc) { 1968 assert(is_pcrelative_long(pc), "not a pcrelative instruction"); 1969 return pc + get_pcrel_offset(pc); 1970 } 1971 1972 // Patch pc relative load address. 1973 void MacroAssembler::patch_target_addr_pcrel(address pc, address con) { 1974 unsigned long inst; 1975 // Offset is +/- 2**32 -> use long. 1976 ptrdiff_t distance = con - pc; 1977 1978 get_instruction(pc, &inst); 1979 1980 if (is_pcrelative_short(inst)) { 1981 *(short *)(pc+2) = RelAddr::pcrel_off16(con, pc); // Instructions are at least 2-byte aligned, no test required. 1982 1983 // Some extra safety net. 1984 if (!RelAddr::is_in_range_of_RelAddr16(distance)) { 1985 print_dbg_msg(tty, inst, "distance out of range (16bit)", 4); 1986 dump_code_range(tty, pc, 32, "distance out of range (16bit)"); 1987 guarantee(RelAddr::is_in_range_of_RelAddr16(distance), "too far away (more than +/- 2**16"); 1988 } 1989 return; 1990 } 1991 1992 if (is_pcrelative_long(inst)) { 1993 *(int *)(pc+2) = RelAddr::pcrel_off32(con, pc); 1994 1995 // Some Extra safety net. 1996 if (!RelAddr::is_in_range_of_RelAddr32(distance)) { 1997 print_dbg_msg(tty, inst, "distance out of range (32bit)", 6); 1998 dump_code_range(tty, pc, 32, "distance out of range (32bit)"); 1999 guarantee(RelAddr::is_in_range_of_RelAddr32(distance), "too far away (more than +/- 2**32"); 2000 } 2001 return; 2002 } 2003 2004 guarantee(false, "not a pcrelative instruction to patch!"); 2005 } 2006 2007 // "Current PC" here means the address just behind the basr instruction. 2008 address MacroAssembler::get_PC(Register result) { 2009 z_basr(result, Z_R0); // Don't branch, just save next instruction address in result. 2010 return pc(); 2011 } 2012 2013 // Get current PC + offset. 2014 // Offset given in bytes, must be even! 2015 // "Current PC" here means the address of the larl instruction plus the given offset. 2016 address MacroAssembler::get_PC(Register result, int64_t offset) { 2017 address here = pc(); 2018 z_larl(result, offset/2); // Save target instruction address in result. 2019 return here + offset; 2020 } 2021 2022 void MacroAssembler::instr_size(Register size, Register pc) { 2023 // Extract 2 most significant bits of current instruction. 2024 z_llgc(size, Address(pc)); 2025 z_srl(size, 6); 2026 // Compute (x+3)&6 which translates 0->2, 1->4, 2->4, 3->6. 2027 z_ahi(size, 3); 2028 z_nill(size, 6); 2029 } 2030 2031 // Resize_frame with SP(new) = SP(old) - [offset]. 2032 void MacroAssembler::resize_frame_sub(Register offset, Register fp, bool load_fp) 2033 { 2034 assert_different_registers(offset, fp, Z_SP); 2035 if (load_fp) { z_lg(fp, _z_abi(callers_sp), Z_SP); } 2036 2037 z_sgr(Z_SP, offset); 2038 z_stg(fp, _z_abi(callers_sp), Z_SP); 2039 } 2040 2041 // Resize_frame with SP(new) = [newSP] + offset. 2042 // This emitter is useful if we already have calculated a pointer 2043 // into the to-be-allocated stack space, e.g. with special alignment properties, 2044 // but need some additional space, e.g. for spilling. 2045 // newSP is the pre-calculated pointer. It must not be modified. 2046 // fp holds, or is filled with, the frame pointer. 2047 // offset is the additional increment which is added to addr to form the new SP. 2048 // Note: specify a negative value to reserve more space! 2049 // load_fp == true only indicates that fp is not pre-filled with the frame pointer. 2050 // It does not guarantee that fp contains the frame pointer at the end. 2051 void MacroAssembler::resize_frame_abs_with_offset(Register newSP, Register fp, int offset, bool load_fp) { 2052 assert_different_registers(newSP, fp, Z_SP); 2053 2054 if (load_fp) { 2055 z_lg(fp, _z_abi(callers_sp), Z_SP); 2056 } 2057 2058 add2reg(Z_SP, offset, newSP); 2059 z_stg(fp, _z_abi(callers_sp), Z_SP); 2060 } 2061 2062 // Resize_frame with SP(new) = [newSP]. 2063 // load_fp == true only indicates that fp is not pre-filled with the frame pointer. 2064 // It does not guarantee that fp contains the frame pointer at the end. 2065 void MacroAssembler::resize_frame_absolute(Register newSP, Register fp, bool load_fp) { 2066 assert_different_registers(newSP, fp, Z_SP); 2067 2068 if (load_fp) { 2069 z_lg(fp, _z_abi(callers_sp), Z_SP); // need to use load/store. 2070 } 2071 2072 z_lgr(Z_SP, newSP); 2073 if (newSP != Z_R0) { // make sure we generate correct code, no matter what register newSP uses. 2074 z_stg(fp, _z_abi(callers_sp), newSP); 2075 } else { 2076 z_stg(fp, _z_abi(callers_sp), Z_SP); 2077 } 2078 } 2079 2080 // Resize_frame with SP(new) = SP(old) + offset. 2081 void MacroAssembler::resize_frame(RegisterOrConstant offset, Register fp, bool load_fp) { 2082 assert_different_registers(fp, Z_SP); 2083 2084 if (load_fp) { 2085 z_lg(fp, _z_abi(callers_sp), Z_SP); 2086 } 2087 add64(Z_SP, offset); 2088 z_stg(fp, _z_abi(callers_sp), Z_SP); 2089 } 2090 2091 void MacroAssembler::push_frame(Register bytes, Register old_sp, bool copy_sp, bool bytes_with_inverted_sign) { 2092 #ifdef ASSERT 2093 assert_different_registers(bytes, old_sp, Z_SP); 2094 if (!copy_sp) { 2095 z_cgr(old_sp, Z_SP); 2096 asm_assert_eq("[old_sp]!=[Z_SP]", 0x211); 2097 } 2098 #endif 2099 if (copy_sp) { z_lgr(old_sp, Z_SP); } 2100 if (bytes_with_inverted_sign) { 2101 z_agr(Z_SP, bytes); 2102 } else { 2103 z_sgr(Z_SP, bytes); // Z_sgfr sufficient, but probably not faster. 2104 } 2105 z_stg(old_sp, _z_abi(callers_sp), Z_SP); 2106 } 2107 2108 unsigned int MacroAssembler::push_frame(unsigned int bytes, Register scratch) { 2109 long offset = Assembler::align(bytes, frame::alignment_in_bytes); 2110 assert(offset > 0, "should push a frame with positive size, size = %ld.", offset); 2111 assert(Displacement::is_validDisp(-offset), "frame size out of range, size = %ld", offset); 2112 2113 // We must not write outside the current stack bounds (given by Z_SP). 2114 // Thus, we have to first update Z_SP and then store the previous SP as stack linkage. 2115 // We rely on Z_R0 by default to be available as scratch. 2116 z_lgr(scratch, Z_SP); 2117 add2reg(Z_SP, -offset); 2118 z_stg(scratch, _z_abi(callers_sp), Z_SP); 2119 #ifdef ASSERT 2120 // Just make sure nobody uses the value in the default scratch register. 2121 // When another register is used, the caller might rely on it containing the frame pointer. 2122 if (scratch == Z_R0) { 2123 z_iihf(scratch, 0xbaadbabe); 2124 z_iilf(scratch, 0xdeadbeef); 2125 } 2126 #endif 2127 return offset; 2128 } 2129 2130 // Push a frame of size `bytes' plus abi160 on top. 2131 unsigned int MacroAssembler::push_frame_abi160(unsigned int bytes) { 2132 BLOCK_COMMENT("push_frame_abi160 {"); 2133 unsigned int res = push_frame(bytes + frame::z_abi_160_size); 2134 BLOCK_COMMENT("} push_frame_abi160"); 2135 return res; 2136 } 2137 2138 // Pop current C frame. 2139 void MacroAssembler::pop_frame() { 2140 BLOCK_COMMENT("pop_frame:"); 2141 Assembler::z_lg(Z_SP, _z_abi(callers_sp), Z_SP); 2142 } 2143 2144 // Pop current C frame and restore return PC register (Z_R14). 2145 void MacroAssembler::pop_frame_restore_retPC(int frame_size_in_bytes) { 2146 BLOCK_COMMENT("pop_frame_restore_retPC:"); 2147 int retPC_offset = _z_abi16(return_pc) + frame_size_in_bytes; 2148 // If possible, pop frame by add instead of load (a penny saved is a penny got :-). 2149 if (Displacement::is_validDisp(retPC_offset)) { 2150 z_lg(Z_R14, retPC_offset, Z_SP); 2151 add2reg(Z_SP, frame_size_in_bytes); 2152 } else { 2153 add2reg(Z_SP, frame_size_in_bytes); 2154 restore_return_pc(); 2155 } 2156 } 2157 2158 void MacroAssembler::call_VM_leaf_base(address entry_point, bool allow_relocation) { 2159 if (allow_relocation) { 2160 call_c(entry_point); 2161 } else { 2162 call_c_static(entry_point); 2163 } 2164 } 2165 2166 void MacroAssembler::call_VM_leaf_base(address entry_point) { 2167 bool allow_relocation = true; 2168 call_VM_leaf_base(entry_point, allow_relocation); 2169 } 2170 2171 void MacroAssembler::call_VM_base(Register oop_result, 2172 Register last_java_sp, 2173 address entry_point, 2174 bool allow_relocation, 2175 bool check_exceptions) { // Defaults to true. 2176 // Allow_relocation indicates, if true, that the generated code shall 2177 // be fit for code relocation or referenced data relocation. In other 2178 // words: all addresses must be considered variable. PC-relative addressing 2179 // is not possible then. 2180 // On the other hand, if (allow_relocation == false), addresses and offsets 2181 // may be considered stable, enabling us to take advantage of some PC-relative 2182 // addressing tweaks. These might improve performance and reduce code size. 2183 2184 // Determine last_java_sp register. 2185 if (!last_java_sp->is_valid()) { 2186 last_java_sp = Z_SP; // Load Z_SP as SP. 2187 } 2188 2189 set_top_ijava_frame_at_SP_as_last_Java_frame(last_java_sp, Z_R1, allow_relocation); 2190 2191 // ARG1 must hold thread address. 2192 z_lgr(Z_ARG1, Z_thread); 2193 2194 address return_pc = NULL; 2195 if (allow_relocation) { 2196 return_pc = call_c(entry_point); 2197 } else { 2198 return_pc = call_c_static(entry_point); 2199 } 2200 2201 reset_last_Java_frame(allow_relocation); 2202 2203 // C++ interp handles this in the interpreter. 2204 check_and_handle_popframe(Z_thread); 2205 check_and_handle_earlyret(Z_thread); 2206 2207 // Check for pending exceptions. 2208 if (check_exceptions) { 2209 // Check for pending exceptions (java_thread is set upon return). 2210 load_and_test_long(Z_R0_scratch, Address(Z_thread, Thread::pending_exception_offset())); 2211 2212 // This used to conditionally jump to forward_exception however it is 2213 // possible if we relocate that the branch will not reach. So we must jump 2214 // around so we can always reach. 2215 2216 Label ok; 2217 z_bre(ok); // Bcondequal is the same as bcondZero. 2218 call_stub(StubRoutines::forward_exception_entry()); 2219 bind(ok); 2220 } 2221 2222 // Get oop result if there is one and reset the value in the thread. 2223 if (oop_result->is_valid()) { 2224 get_vm_result(oop_result); 2225 } 2226 2227 _last_calls_return_pc = return_pc; // Wipe out other (error handling) calls. 2228 } 2229 2230 void MacroAssembler::call_VM_base(Register oop_result, 2231 Register last_java_sp, 2232 address entry_point, 2233 bool check_exceptions) { // Defaults to true. 2234 bool allow_relocation = true; 2235 call_VM_base(oop_result, last_java_sp, entry_point, allow_relocation, check_exceptions); 2236 } 2237 2238 // VM calls without explicit last_java_sp. 2239 2240 void MacroAssembler::call_VM(Register oop_result, address entry_point, bool check_exceptions) { 2241 // Call takes possible detour via InterpreterMacroAssembler. 2242 call_VM_base(oop_result, noreg, entry_point, true, check_exceptions); 2243 } 2244 2245 void MacroAssembler::call_VM(Register oop_result, address entry_point, Register arg_1, bool check_exceptions) { 2246 // Z_ARG1 is reserved for the thread. 2247 lgr_if_needed(Z_ARG2, arg_1); 2248 call_VM(oop_result, entry_point, check_exceptions); 2249 } 2250 2251 void MacroAssembler::call_VM(Register oop_result, address entry_point, Register arg_1, Register arg_2, bool check_exceptions) { 2252 // Z_ARG1 is reserved for the thread. 2253 lgr_if_needed(Z_ARG2, arg_1); 2254 assert(arg_2 != Z_ARG2, "smashed argument"); 2255 lgr_if_needed(Z_ARG3, arg_2); 2256 call_VM(oop_result, entry_point, check_exceptions); 2257 } 2258 2259 void MacroAssembler::call_VM(Register oop_result, address entry_point, Register arg_1, Register arg_2, 2260 Register arg_3, bool check_exceptions) { 2261 // Z_ARG1 is reserved for the thread. 2262 lgr_if_needed(Z_ARG2, arg_1); 2263 assert(arg_2 != Z_ARG2, "smashed argument"); 2264 lgr_if_needed(Z_ARG3, arg_2); 2265 assert(arg_3 != Z_ARG2 && arg_3 != Z_ARG3, "smashed argument"); 2266 lgr_if_needed(Z_ARG4, arg_3); 2267 call_VM(oop_result, entry_point, check_exceptions); 2268 } 2269 2270 // VM static calls without explicit last_java_sp. 2271 2272 void MacroAssembler::call_VM_static(Register oop_result, address entry_point, bool check_exceptions) { 2273 // Call takes possible detour via InterpreterMacroAssembler. 2274 call_VM_base(oop_result, noreg, entry_point, false, check_exceptions); 2275 } 2276 2277 void MacroAssembler::call_VM_static(Register oop_result, address entry_point, Register arg_1, Register arg_2, 2278 Register arg_3, bool check_exceptions) { 2279 // Z_ARG1 is reserved for the thread. 2280 lgr_if_needed(Z_ARG2, arg_1); 2281 assert(arg_2 != Z_ARG2, "smashed argument"); 2282 lgr_if_needed(Z_ARG3, arg_2); 2283 assert(arg_3 != Z_ARG2 && arg_3 != Z_ARG3, "smashed argument"); 2284 lgr_if_needed(Z_ARG4, arg_3); 2285 call_VM_static(oop_result, entry_point, check_exceptions); 2286 } 2287 2288 // VM calls with explicit last_java_sp. 2289 2290 void MacroAssembler::call_VM(Register oop_result, Register last_java_sp, address entry_point, bool check_exceptions) { 2291 // Call takes possible detour via InterpreterMacroAssembler. 2292 call_VM_base(oop_result, last_java_sp, entry_point, true, check_exceptions); 2293 } 2294 2295 void MacroAssembler::call_VM(Register oop_result, Register last_java_sp, address entry_point, Register arg_1, bool check_exceptions) { 2296 // Z_ARG1 is reserved for the thread. 2297 lgr_if_needed(Z_ARG2, arg_1); 2298 call_VM(oop_result, last_java_sp, entry_point, check_exceptions); 2299 } 2300 2301 void MacroAssembler::call_VM(Register oop_result, Register last_java_sp, address entry_point, Register arg_1, 2302 Register arg_2, bool check_exceptions) { 2303 // Z_ARG1 is reserved for the thread. 2304 lgr_if_needed(Z_ARG2, arg_1); 2305 assert(arg_2 != Z_ARG2, "smashed argument"); 2306 lgr_if_needed(Z_ARG3, arg_2); 2307 call_VM(oop_result, last_java_sp, entry_point, check_exceptions); 2308 } 2309 2310 void MacroAssembler::call_VM(Register oop_result, Register last_java_sp, address entry_point, Register arg_1, 2311 Register arg_2, Register arg_3, bool check_exceptions) { 2312 // Z_ARG1 is reserved for the thread. 2313 lgr_if_needed(Z_ARG2, arg_1); 2314 assert(arg_2 != Z_ARG2, "smashed argument"); 2315 lgr_if_needed(Z_ARG3, arg_2); 2316 assert(arg_3 != Z_ARG2 && arg_3 != Z_ARG3, "smashed argument"); 2317 lgr_if_needed(Z_ARG4, arg_3); 2318 call_VM(oop_result, last_java_sp, entry_point, check_exceptions); 2319 } 2320 2321 // VM leaf calls. 2322 2323 void MacroAssembler::call_VM_leaf(address entry_point) { 2324 // Call takes possible detour via InterpreterMacroAssembler. 2325 call_VM_leaf_base(entry_point, true); 2326 } 2327 2328 void MacroAssembler::call_VM_leaf(address entry_point, Register arg_1) { 2329 if (arg_1 != noreg) lgr_if_needed(Z_ARG1, arg_1); 2330 call_VM_leaf(entry_point); 2331 } 2332 2333 void MacroAssembler::call_VM_leaf(address entry_point, Register arg_1, Register arg_2) { 2334 if (arg_1 != noreg) lgr_if_needed(Z_ARG1, arg_1); 2335 assert(arg_2 != Z_ARG1, "smashed argument"); 2336 if (arg_2 != noreg) lgr_if_needed(Z_ARG2, arg_2); 2337 call_VM_leaf(entry_point); 2338 } 2339 2340 void MacroAssembler::call_VM_leaf(address entry_point, Register arg_1, Register arg_2, Register arg_3) { 2341 if (arg_1 != noreg) lgr_if_needed(Z_ARG1, arg_1); 2342 assert(arg_2 != Z_ARG1, "smashed argument"); 2343 if (arg_2 != noreg) lgr_if_needed(Z_ARG2, arg_2); 2344 assert(arg_3 != Z_ARG1 && arg_3 != Z_ARG2, "smashed argument"); 2345 if (arg_3 != noreg) lgr_if_needed(Z_ARG3, arg_3); 2346 call_VM_leaf(entry_point); 2347 } 2348 2349 // Static VM leaf calls. 2350 // Really static VM leaf calls are never patched. 2351 2352 void MacroAssembler::call_VM_leaf_static(address entry_point) { 2353 // Call takes possible detour via InterpreterMacroAssembler. 2354 call_VM_leaf_base(entry_point, false); 2355 } 2356 2357 void MacroAssembler::call_VM_leaf_static(address entry_point, Register arg_1) { 2358 if (arg_1 != noreg) lgr_if_needed(Z_ARG1, arg_1); 2359 call_VM_leaf_static(entry_point); 2360 } 2361 2362 void MacroAssembler::call_VM_leaf_static(address entry_point, Register arg_1, Register arg_2) { 2363 if (arg_1 != noreg) lgr_if_needed(Z_ARG1, arg_1); 2364 assert(arg_2 != Z_ARG1, "smashed argument"); 2365 if (arg_2 != noreg) lgr_if_needed(Z_ARG2, arg_2); 2366 call_VM_leaf_static(entry_point); 2367 } 2368 2369 void MacroAssembler::call_VM_leaf_static(address entry_point, Register arg_1, Register arg_2, Register arg_3) { 2370 if (arg_1 != noreg) lgr_if_needed(Z_ARG1, arg_1); 2371 assert(arg_2 != Z_ARG1, "smashed argument"); 2372 if (arg_2 != noreg) lgr_if_needed(Z_ARG2, arg_2); 2373 assert(arg_3 != Z_ARG1 && arg_3 != Z_ARG2, "smashed argument"); 2374 if (arg_3 != noreg) lgr_if_needed(Z_ARG3, arg_3); 2375 call_VM_leaf_static(entry_point); 2376 } 2377 2378 // Don't use detour via call_c(reg). 2379 address MacroAssembler::call_c(address function_entry) { 2380 load_const(Z_R1, function_entry); 2381 return call(Z_R1); 2382 } 2383 2384 // Variant for really static (non-relocatable) calls which are never patched. 2385 address MacroAssembler::call_c_static(address function_entry) { 2386 load_absolute_address(Z_R1, function_entry); 2387 #if 0 // def ASSERT 2388 // Verify that call site did not move. 2389 load_const_optimized(Z_R0, function_entry); 2390 z_cgr(Z_R1, Z_R0); 2391 z_brc(bcondEqual, 3); 2392 z_illtrap(0xba); 2393 #endif 2394 return call(Z_R1); 2395 } 2396 2397 address MacroAssembler::call_c_opt(address function_entry) { 2398 bool success = call_far_patchable(function_entry, -2 /* emit relocation + constant */); 2399 _last_calls_return_pc = success ? pc() : NULL; 2400 return _last_calls_return_pc; 2401 } 2402 2403 // Identify a call_far_patchable instruction: LARL + LG + BASR 2404 // 2405 // nop ; optionally, if required for alignment 2406 // lgrl rx,A(TOC entry) ; PC-relative access into constant pool 2407 // basr Z_R14,rx ; end of this instruction must be aligned to a word boundary 2408 // 2409 // Code pattern will eventually get patched into variant2 (see below for detection code). 2410 // 2411 bool MacroAssembler::is_call_far_patchable_variant0_at(address instruction_addr) { 2412 address iaddr = instruction_addr; 2413 2414 // Check for the actual load instruction. 2415 if (!is_load_const_from_toc(iaddr)) { return false; } 2416 iaddr += load_const_from_toc_size(); 2417 2418 // Check for the call (BASR) instruction, finally. 2419 assert(iaddr-instruction_addr+call_byregister_size() == call_far_patchable_size(), "size mismatch"); 2420 return is_call_byregister(iaddr); 2421 } 2422 2423 // Identify a call_far_patchable instruction: BRASL 2424 // 2425 // Code pattern to suits atomic patching: 2426 // nop ; Optionally, if required for alignment. 2427 // nop ... ; Multiple filler nops to compensate for size difference (variant0 is longer). 2428 // nop ; For code pattern detection: Prepend each BRASL with a nop. 2429 // brasl Z_R14,<reladdr> ; End of code must be 4-byte aligned ! 2430 bool MacroAssembler::is_call_far_patchable_variant2_at(address instruction_addr) { 2431 const address call_addr = (address)((intptr_t)instruction_addr + call_far_patchable_size() - call_far_pcrelative_size()); 2432 2433 // Check for correct number of leading nops. 2434 address iaddr; 2435 for (iaddr = instruction_addr; iaddr < call_addr; iaddr += nop_size()) { 2436 if (!is_z_nop(iaddr)) { return false; } 2437 } 2438 assert(iaddr == call_addr, "sanity"); 2439 2440 // --> Check for call instruction. 2441 if (is_call_far_pcrelative(call_addr)) { 2442 assert(call_addr-instruction_addr+call_far_pcrelative_size() == call_far_patchable_size(), "size mismatch"); 2443 return true; 2444 } 2445 2446 return false; 2447 } 2448 2449 // Emit a NOT mt-safely patchable 64 bit absolute call. 2450 // If toc_offset == -2, then the destination of the call (= target) is emitted 2451 // to the constant pool and a runtime_call relocation is added 2452 // to the code buffer. 2453 // If toc_offset != -2, target must already be in the constant pool at 2454 // _ctableStart+toc_offset (a caller can retrieve toc_offset 2455 // from the runtime_call relocation). 2456 // Special handling of emitting to scratch buffer when there is no constant pool. 2457 // Slightly changed code pattern. We emit an additional nop if we would 2458 // not end emitting at a word aligned address. This is to ensure 2459 // an atomically patchable displacement in brasl instructions. 2460 // 2461 // A call_far_patchable comes in different flavors: 2462 // - LARL(CP) / LG(CP) / BR (address in constant pool, access via CP register) 2463 // - LGRL(CP) / BR (address in constant pool, pc-relative accesss) 2464 // - BRASL (relative address of call target coded in instruction) 2465 // All flavors occupy the same amount of space. Length differences are compensated 2466 // by leading nops, such that the instruction sequence always ends at the same 2467 // byte offset. This is required to keep the return offset constant. 2468 // Furthermore, the return address (the end of the instruction sequence) is forced 2469 // to be on a 4-byte boundary. This is required for atomic patching, should we ever 2470 // need to patch the call target of the BRASL flavor. 2471 // RETURN value: false, if no constant pool entry could be allocated, true otherwise. 2472 bool MacroAssembler::call_far_patchable(address target, int64_t tocOffset) { 2473 // Get current pc and ensure word alignment for end of instr sequence. 2474 const address start_pc = pc(); 2475 const intptr_t start_off = offset(); 2476 assert(!call_far_patchable_requires_alignment_nop(start_pc), "call_far_patchable requires aligned address"); 2477 const ptrdiff_t dist = (ptrdiff_t)(target - (start_pc + 2)); // Prepend each BRASL with a nop. 2478 const bool emit_target_to_pool = (tocOffset == -2) && !code_section()->scratch_emit(); 2479 const bool emit_relative_call = !emit_target_to_pool && 2480 RelAddr::is_in_range_of_RelAddr32(dist) && 2481 ReoptimizeCallSequences && 2482 !code_section()->scratch_emit(); 2483 2484 if (emit_relative_call) { 2485 // Add padding to get the same size as below. 2486 const unsigned int padding = call_far_patchable_size() - call_far_pcrelative_size(); 2487 unsigned int current_padding; 2488 for (current_padding = 0; current_padding < padding; current_padding += nop_size()) { z_nop(); } 2489 assert(current_padding == padding, "sanity"); 2490 2491 // relative call: len = 2(nop) + 6 (brasl) 2492 // CodeBlob resize cannot occur in this case because 2493 // this call is emitted into pre-existing space. 2494 z_nop(); // Prepend each BRASL with a nop. 2495 z_brasl(Z_R14, target); 2496 } else { 2497 // absolute call: Get address from TOC. 2498 // len = (load TOC){6|0} + (load from TOC){6} + (basr){2} = {14|8} 2499 if (emit_target_to_pool) { 2500 // When emitting the call for the first time, we do not need to use 2501 // the pc-relative version. It will be patched anyway, when the code 2502 // buffer is copied. 2503 // Relocation is not needed when !ReoptimizeCallSequences. 2504 relocInfo::relocType rt = ReoptimizeCallSequences ? relocInfo::runtime_call_w_cp_type : relocInfo::none; 2505 AddressLiteral dest(target, rt); 2506 // Store_oop_in_toc() adds dest to the constant table. As side effect, this kills 2507 // inst_mark(). Reset if possible. 2508 bool reset_mark = (inst_mark() == pc()); 2509 tocOffset = store_oop_in_toc(dest); 2510 if (reset_mark) { set_inst_mark(); } 2511 if (tocOffset == -1) { 2512 return false; // Couldn't create constant pool entry. 2513 } 2514 } 2515 assert(offset() == start_off, "emit no code before this point!"); 2516 2517 address tocPos = pc() + tocOffset; 2518 if (emit_target_to_pool) { 2519 tocPos = code()->consts()->start() + tocOffset; 2520 } 2521 load_long_pcrelative(Z_R14, tocPos); 2522 z_basr(Z_R14, Z_R14); 2523 } 2524 2525 #ifdef ASSERT 2526 // Assert that we can identify the emitted call. 2527 assert(is_call_far_patchable_at(addr_at(start_off)), "can't identify emitted call"); 2528 assert(offset() == start_off+call_far_patchable_size(), "wrong size"); 2529 2530 if (emit_target_to_pool) { 2531 assert(get_dest_of_call_far_patchable_at(addr_at(start_off), code()->consts()->start()) == target, 2532 "wrong encoding of dest address"); 2533 } 2534 #endif 2535 return true; // success 2536 } 2537 2538 // Identify a call_far_patchable instruction. 2539 // For more detailed information see header comment of call_far_patchable. 2540 bool MacroAssembler::is_call_far_patchable_at(address instruction_addr) { 2541 return is_call_far_patchable_variant2_at(instruction_addr) || // short version: BRASL 2542 is_call_far_patchable_variant0_at(instruction_addr); // long version LARL + LG + BASR 2543 } 2544 2545 // Does the call_far_patchable instruction use a pc-relative encoding 2546 // of the call destination? 2547 bool MacroAssembler::is_call_far_patchable_pcrelative_at(address instruction_addr) { 2548 // Variant 2 is pc-relative. 2549 return is_call_far_patchable_variant2_at(instruction_addr); 2550 } 2551 2552 bool MacroAssembler::is_call_far_pcrelative(address instruction_addr) { 2553 // Prepend each BRASL with a nop. 2554 return is_z_nop(instruction_addr) && is_z_brasl(instruction_addr + nop_size()); // Match at position after one nop required. 2555 } 2556 2557 // Set destination address of a call_far_patchable instruction. 2558 void MacroAssembler::set_dest_of_call_far_patchable_at(address instruction_addr, address dest, int64_t tocOffset) { 2559 ResourceMark rm; 2560 2561 // Now that CP entry is verified, patch call to a pc-relative call (if circumstances permit). 2562 int code_size = MacroAssembler::call_far_patchable_size(); 2563 CodeBuffer buf(instruction_addr, code_size); 2564 MacroAssembler masm(&buf); 2565 masm.call_far_patchable(dest, tocOffset); 2566 ICache::invalidate_range(instruction_addr, code_size); // Empty on z. 2567 } 2568 2569 // Get dest address of a call_far_patchable instruction. 2570 address MacroAssembler::get_dest_of_call_far_patchable_at(address instruction_addr, address ctable) { 2571 // Dynamic TOC: absolute address in constant pool. 2572 // Check variant2 first, it is more frequent. 2573 2574 // Relative address encoded in call instruction. 2575 if (is_call_far_patchable_variant2_at(instruction_addr)) { 2576 return MacroAssembler::get_target_addr_pcrel(instruction_addr + nop_size()); // Prepend each BRASL with a nop. 2577 2578 // Absolute address in constant pool. 2579 } else if (is_call_far_patchable_variant0_at(instruction_addr)) { 2580 address iaddr = instruction_addr; 2581 2582 long tocOffset = get_load_const_from_toc_offset(iaddr); 2583 address tocLoc = iaddr + tocOffset; 2584 return *(address *)(tocLoc); 2585 } else { 2586 fprintf(stderr, "MacroAssembler::get_dest_of_call_far_patchable_at has a problem at %p:\n", instruction_addr); 2587 fprintf(stderr, "not a call_far_patchable: %16.16lx %16.16lx, len = %d\n", 2588 *(unsigned long*)instruction_addr, 2589 *(unsigned long*)(instruction_addr+8), 2590 call_far_patchable_size()); 2591 Disassembler::decode(instruction_addr, instruction_addr+call_far_patchable_size()); 2592 ShouldNotReachHere(); 2593 return NULL; 2594 } 2595 } 2596 2597 void MacroAssembler::align_call_far_patchable(address pc) { 2598 if (call_far_patchable_requires_alignment_nop(pc)) { z_nop(); } 2599 } 2600 2601 void MacroAssembler::check_and_handle_earlyret(Register java_thread) { 2602 } 2603 2604 void MacroAssembler::check_and_handle_popframe(Register java_thread) { 2605 } 2606 2607 // Read from the polling page. 2608 // Use TM or TMY instruction, depending on read offset. 2609 // offset = 0: Use TM, safepoint polling. 2610 // offset < 0: Use TMY, profiling safepoint polling. 2611 void MacroAssembler::load_from_polling_page(Register polling_page_address, int64_t offset) { 2612 if (Immediate::is_uimm12(offset)) { 2613 z_tm(offset, polling_page_address, mask_safepoint); 2614 } else { 2615 z_tmy(offset, polling_page_address, mask_profiling); 2616 } 2617 } 2618 2619 // Check whether z_instruction is a read access to the polling page 2620 // which was emitted by load_from_polling_page(..). 2621 bool MacroAssembler::is_load_from_polling_page(address instr_loc) { 2622 unsigned long z_instruction; 2623 unsigned int ilen = get_instruction(instr_loc, &z_instruction); 2624 2625 if (ilen == 2) { return false; } // It's none of the allowed instructions. 2626 2627 if (ilen == 4) { 2628 if (!is_z_tm(z_instruction)) { return false; } // It's len=4, but not a z_tm. fail. 2629 2630 int ms = inv_mask(z_instruction,8,32); // mask 2631 int ra = inv_reg(z_instruction,16,32); // base register 2632 int ds = inv_uimm12(z_instruction); // displacement 2633 2634 if (!(ds == 0 && ra != 0 && ms == mask_safepoint)) { 2635 return false; // It's not a z_tm(0, ra, mask_safepoint). Fail. 2636 } 2637 2638 } else { /* if (ilen == 6) */ 2639 2640 assert(!is_z_lg(z_instruction), "old form (LG) polling page access. Please fix and use TM(Y)."); 2641 2642 if (!is_z_tmy(z_instruction)) { return false; } // It's len=6, but not a z_tmy. fail. 2643 2644 int ms = inv_mask(z_instruction,8,48); // mask 2645 int ra = inv_reg(z_instruction,16,48); // base register 2646 int ds = inv_simm20(z_instruction); // displacement 2647 } 2648 2649 return true; 2650 } 2651 2652 // Extract poll address from instruction and ucontext. 2653 address MacroAssembler::get_poll_address(address instr_loc, void* ucontext) { 2654 assert(ucontext != NULL, "must have ucontext"); 2655 ucontext_t* uc = (ucontext_t*) ucontext; 2656 unsigned long z_instruction; 2657 unsigned int ilen = get_instruction(instr_loc, &z_instruction); 2658 2659 if (ilen == 4 && is_z_tm(z_instruction)) { 2660 int ra = inv_reg(z_instruction, 16, 32); // base register 2661 int ds = inv_uimm12(z_instruction); // displacement 2662 address addr = (address)uc->uc_mcontext.gregs[ra]; 2663 return addr + ds; 2664 } else if (ilen == 6 && is_z_tmy(z_instruction)) { 2665 int ra = inv_reg(z_instruction, 16, 48); // base register 2666 int ds = inv_simm20(z_instruction); // displacement 2667 address addr = (address)uc->uc_mcontext.gregs[ra]; 2668 return addr + ds; 2669 } 2670 2671 ShouldNotReachHere(); 2672 return NULL; 2673 } 2674 2675 // Extract poll register from instruction. 2676 uint MacroAssembler::get_poll_register(address instr_loc) { 2677 unsigned long z_instruction; 2678 unsigned int ilen = get_instruction(instr_loc, &z_instruction); 2679 2680 if (ilen == 4 && is_z_tm(z_instruction)) { 2681 return (uint)inv_reg(z_instruction, 16, 32); // base register 2682 } else if (ilen == 6 && is_z_tmy(z_instruction)) { 2683 return (uint)inv_reg(z_instruction, 16, 48); // base register 2684 } 2685 2686 ShouldNotReachHere(); 2687 return 0; 2688 } 2689 2690 void MacroAssembler::safepoint_poll(Label& slow_path, Register temp_reg) { 2691 if (SafepointMechanism::uses_thread_local_poll()) { 2692 const Address poll_byte_addr(Z_thread, in_bytes(Thread::polling_page_offset()) + 7 /* Big Endian */); 2693 // Armed page has poll_bit set. 2694 z_tm(poll_byte_addr, SafepointMechanism::poll_bit()); 2695 z_brnaz(slow_path); 2696 } else { 2697 load_const_optimized(temp_reg, SafepointSynchronize::address_of_state()); 2698 z_cli(/*SafepointSynchronize::sz_state()*/4-1, temp_reg, SafepointSynchronize::_not_synchronized); 2699 z_brne(slow_path); 2700 } 2701 } 2702 2703 // Don't rely on register locking, always use Z_R1 as scratch register instead. 2704 void MacroAssembler::bang_stack_with_offset(int offset) { 2705 // Stack grows down, caller passes positive offset. 2706 assert(offset > 0, "must bang with positive offset"); 2707 if (Displacement::is_validDisp(-offset)) { 2708 z_tmy(-offset, Z_SP, mask_stackbang); 2709 } else { 2710 add2reg(Z_R1, -offset, Z_SP); // Do not destroy Z_SP!!! 2711 z_tm(0, Z_R1, mask_stackbang); // Just banging. 2712 } 2713 } 2714 2715 void MacroAssembler::reserved_stack_check(Register return_pc) { 2716 // Test if reserved zone needs to be enabled. 2717 Label no_reserved_zone_enabling; 2718 assert(return_pc == Z_R14, "Return pc must be in R14 before z_br() to StackOverflow stub."); 2719 BLOCK_COMMENT("reserved_stack_check {"); 2720 2721 z_clg(Z_SP, Address(Z_thread, JavaThread::reserved_stack_activation_offset())); 2722 z_brl(no_reserved_zone_enabling); 2723 2724 // Enable reserved zone again, throw stack overflow exception. 2725 save_return_pc(); 2726 push_frame_abi160(0); 2727 call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::enable_stack_reserved_zone), Z_thread); 2728 pop_frame(); 2729 restore_return_pc(); 2730 2731 load_const_optimized(Z_R1, StubRoutines::throw_delayed_StackOverflowError_entry()); 2732 // Don't use call() or z_basr(), they will invalidate Z_R14 which contains the return pc. 2733 z_br(Z_R1); 2734 2735 should_not_reach_here(); 2736 2737 bind(no_reserved_zone_enabling); 2738 BLOCK_COMMENT("} reserved_stack_check"); 2739 } 2740 2741 // Defines obj, preserves var_size_in_bytes, okay for t2 == var_size_in_bytes. 2742 void MacroAssembler::tlab_allocate(Register obj, 2743 Register var_size_in_bytes, 2744 int con_size_in_bytes, 2745 Register t1, 2746 Label& slow_case) { 2747 assert_different_registers(obj, var_size_in_bytes, t1); 2748 Register end = t1; 2749 Register thread = Z_thread; 2750 2751 z_lg(obj, Address(thread, JavaThread::tlab_top_offset())); 2752 if (var_size_in_bytes == noreg) { 2753 z_lay(end, Address(obj, con_size_in_bytes)); 2754 } else { 2755 z_lay(end, Address(obj, var_size_in_bytes)); 2756 } 2757 z_cg(end, Address(thread, JavaThread::tlab_end_offset())); 2758 branch_optimized(bcondHigh, slow_case); 2759 2760 // Update the tlab top pointer. 2761 z_stg(end, Address(thread, JavaThread::tlab_top_offset())); 2762 2763 // Recover var_size_in_bytes if necessary. 2764 if (var_size_in_bytes == end) { 2765 z_sgr(var_size_in_bytes, obj); 2766 } 2767 } 2768 2769 // Emitter for interface method lookup. 2770 // input: recv_klass, intf_klass, itable_index 2771 // output: method_result 2772 // kills: itable_index, temp1_reg, Z_R0, Z_R1 2773 // TODO: Temp2_reg is unused. we may use this emitter also in the itable stubs. 2774 // If the register is still not needed then, remove it. 2775 void MacroAssembler::lookup_interface_method(Register recv_klass, 2776 Register intf_klass, 2777 RegisterOrConstant itable_index, 2778 Register method_result, 2779 Register temp1_reg, 2780 Label& no_such_interface, 2781 bool return_method) { 2782 2783 const Register vtable_len = temp1_reg; // Used to compute itable_entry_addr. 2784 const Register itable_entry_addr = Z_R1_scratch; 2785 const Register itable_interface = Z_R0_scratch; 2786 2787 BLOCK_COMMENT("lookup_interface_method {"); 2788 2789 // Load start of itable entries into itable_entry_addr. 2790 z_llgf(vtable_len, Address(recv_klass, Klass::vtable_length_offset())); 2791 z_sllg(vtable_len, vtable_len, exact_log2(vtableEntry::size_in_bytes())); 2792 2793 // Loop over all itable entries until desired interfaceOop(Rinterface) found. 2794 const int vtable_base_offset = in_bytes(Klass::vtable_start_offset()); 2795 2796 add2reg_with_index(itable_entry_addr, 2797 vtable_base_offset + itableOffsetEntry::interface_offset_in_bytes(), 2798 recv_klass, vtable_len); 2799 2800 const int itable_offset_search_inc = itableOffsetEntry::size() * wordSize; 2801 Label search; 2802 2803 bind(search); 2804 2805 // Handle IncompatibleClassChangeError. 2806 // If the entry is NULL then we've reached the end of the table 2807 // without finding the expected interface, so throw an exception. 2808 load_and_test_long(itable_interface, Address(itable_entry_addr)); 2809 z_bre(no_such_interface); 2810 2811 add2reg(itable_entry_addr, itable_offset_search_inc); 2812 z_cgr(itable_interface, intf_klass); 2813 z_brne(search); 2814 2815 // Entry found and itable_entry_addr points to it, get offset of vtable for interface. 2816 if (return_method) { 2817 const int vtable_offset_offset = (itableOffsetEntry::offset_offset_in_bytes() - 2818 itableOffsetEntry::interface_offset_in_bytes()) - 2819 itable_offset_search_inc; 2820 2821 // Compute itableMethodEntry and get method and entry point 2822 // we use addressing with index and displacement, since the formula 2823 // for computing the entry's offset has a fixed and a dynamic part, 2824 // the latter depending on the matched interface entry and on the case, 2825 // that the itable index has been passed as a register, not a constant value. 2826 int method_offset = itableMethodEntry::method_offset_in_bytes(); 2827 // Fixed part (displacement), common operand. 2828 Register itable_offset = method_result; // Dynamic part (index register). 2829 2830 if (itable_index.is_register()) { 2831 // Compute the method's offset in that register, for the formula, see the 2832 // else-clause below. 2833 z_sllg(itable_offset, itable_index.as_register(), exact_log2(itableMethodEntry::size() * wordSize)); 2834 z_agf(itable_offset, vtable_offset_offset, itable_entry_addr); 2835 } else { 2836 // Displacement increases. 2837 method_offset += itableMethodEntry::size() * wordSize * itable_index.as_constant(); 2838 2839 // Load index from itable. 2840 z_llgf(itable_offset, vtable_offset_offset, itable_entry_addr); 2841 } 2842 2843 // Finally load the method's oop. 2844 z_lg(method_result, method_offset, itable_offset, recv_klass); 2845 } 2846 BLOCK_COMMENT("} lookup_interface_method"); 2847 } 2848 2849 // Lookup for virtual method invocation. 2850 void MacroAssembler::lookup_virtual_method(Register recv_klass, 2851 RegisterOrConstant vtable_index, 2852 Register method_result) { 2853 assert_different_registers(recv_klass, vtable_index.register_or_noreg()); 2854 assert(vtableEntry::size() * wordSize == wordSize, 2855 "else adjust the scaling in the code below"); 2856 2857 BLOCK_COMMENT("lookup_virtual_method {"); 2858 2859 const int base = in_bytes(Klass::vtable_start_offset()); 2860 2861 if (vtable_index.is_constant()) { 2862 // Load with base + disp. 2863 Address vtable_entry_addr(recv_klass, 2864 vtable_index.as_constant() * wordSize + 2865 base + 2866 vtableEntry::method_offset_in_bytes()); 2867 2868 z_lg(method_result, vtable_entry_addr); 2869 } else { 2870 // Shift index properly and load with base + index + disp. 2871 Register vindex = vtable_index.as_register(); 2872 Address vtable_entry_addr(recv_klass, vindex, 2873 base + vtableEntry::method_offset_in_bytes()); 2874 2875 z_sllg(vindex, vindex, exact_log2(wordSize)); 2876 z_lg(method_result, vtable_entry_addr); 2877 } 2878 BLOCK_COMMENT("} lookup_virtual_method"); 2879 } 2880 2881 // Factor out code to call ic_miss_handler. 2882 // Generate code to call the inline cache miss handler. 2883 // 2884 // In most cases, this code will be generated out-of-line. 2885 // The method parameters are intended to provide some variability. 2886 // ICM - Label which has to be bound to the start of useful code (past any traps). 2887 // trapMarker - Marking byte for the generated illtrap instructions (if any). 2888 // Any value except 0x00 is supported. 2889 // = 0x00 - do not generate illtrap instructions. 2890 // use nops to fill ununsed space. 2891 // requiredSize - required size of the generated code. If the actually 2892 // generated code is smaller, use padding instructions to fill up. 2893 // = 0 - no size requirement, no padding. 2894 // scratch - scratch register to hold branch target address. 2895 // 2896 // The method returns the code offset of the bound label. 2897 unsigned int MacroAssembler::call_ic_miss_handler(Label& ICM, int trapMarker, int requiredSize, Register scratch) { 2898 intptr_t startOffset = offset(); 2899 2900 // Prevent entry at content_begin(). 2901 if (trapMarker != 0) { 2902 z_illtrap(trapMarker); 2903 } 2904 2905 // Load address of inline cache miss code into scratch register 2906 // and branch to cache miss handler. 2907 BLOCK_COMMENT("IC miss handler {"); 2908 BIND(ICM); 2909 unsigned int labelOffset = offset(); 2910 AddressLiteral icmiss(SharedRuntime::get_ic_miss_stub()); 2911 2912 load_const_optimized(scratch, icmiss); 2913 z_br(scratch); 2914 2915 // Fill unused space. 2916 if (requiredSize > 0) { 2917 while ((offset() - startOffset) < requiredSize) { 2918 if (trapMarker == 0) { 2919 z_nop(); 2920 } else { 2921 z_illtrap(trapMarker); 2922 } 2923 } 2924 } 2925 BLOCK_COMMENT("} IC miss handler"); 2926 return labelOffset; 2927 } 2928 2929 void MacroAssembler::nmethod_UEP(Label& ic_miss) { 2930 #ifdef COMPILER2 2931 Register ic_reg = as_Register(Matcher::inline_cache_reg_encode()); 2932 #else 2933 Register ic_reg = as_Register(0); 2934 #endif 2935 int klass_offset = oopDesc::klass_offset_in_bytes(); 2936 if (!ImplicitNullChecks || MacroAssembler::needs_explicit_null_check(klass_offset)) { 2937 if (VM_Version::has_CompareBranch()) { 2938 z_cgij(Z_ARG1, 0, Assembler::bcondEqual, ic_miss); 2939 } else { 2940 z_ltgr(Z_ARG1, Z_ARG1); 2941 z_bre(ic_miss); 2942 } 2943 } 2944 // Compare cached class against klass from receiver. 2945 compare_klass_ptr(ic_reg, klass_offset, Z_ARG1, false); 2946 z_brne(ic_miss); 2947 } 2948 2949 void MacroAssembler::check_klass_subtype_fast_path(Register sub_klass, 2950 Register super_klass, 2951 Register temp1_reg, 2952 Label* L_success, 2953 Label* L_failure, 2954 Label* L_slow_path, 2955 RegisterOrConstant super_check_offset) { 2956 2957 const int sc_offset = in_bytes(Klass::secondary_super_cache_offset()); 2958 const int sco_offset = in_bytes(Klass::super_check_offset_offset()); 2959 2960 bool must_load_sco = (super_check_offset.constant_or_zero() == -1); 2961 bool need_slow_path = (must_load_sco || 2962 super_check_offset.constant_or_zero() == sc_offset); 2963 2964 // Input registers must not overlap. 2965 assert_different_registers(sub_klass, super_klass, temp1_reg); 2966 if (super_check_offset.is_register()) { 2967 assert_different_registers(sub_klass, super_klass, 2968 super_check_offset.as_register()); 2969 } else if (must_load_sco) { 2970 assert(temp1_reg != noreg, "supply either a temp or a register offset"); 2971 } 2972 2973 const Register Rsuper_check_offset = temp1_reg; 2974 2975 NearLabel L_fallthrough; 2976 int label_nulls = 0; 2977 if (L_success == NULL) { L_success = &L_fallthrough; label_nulls++; } 2978 if (L_failure == NULL) { L_failure = &L_fallthrough; label_nulls++; } 2979 if (L_slow_path == NULL) { L_slow_path = &L_fallthrough; label_nulls++; } 2980 assert(label_nulls <= 1 || 2981 (L_slow_path == &L_fallthrough && label_nulls <= 2 && !need_slow_path), 2982 "at most one NULL in the batch, usually"); 2983 2984 BLOCK_COMMENT("check_klass_subtype_fast_path {"); 2985 // If the pointers are equal, we are done (e.g., String[] elements). 2986 // This self-check enables sharing of secondary supertype arrays among 2987 // non-primary types such as array-of-interface. Otherwise, each such 2988 // type would need its own customized SSA. 2989 // We move this check to the front of the fast path because many 2990 // type checks are in fact trivially successful in this manner, 2991 // so we get a nicely predicted branch right at the start of the check. 2992 compare64_and_branch(sub_klass, super_klass, bcondEqual, *L_success); 2993 2994 // Check the supertype display, which is uint. 2995 if (must_load_sco) { 2996 z_llgf(Rsuper_check_offset, sco_offset, super_klass); 2997 super_check_offset = RegisterOrConstant(Rsuper_check_offset); 2998 } 2999 Address super_check_addr(sub_klass, super_check_offset, 0); 3000 z_cg(super_klass, super_check_addr); // compare w/ displayed supertype 3001 3002 // This check has worked decisively for primary supers. 3003 // Secondary supers are sought in the super_cache ('super_cache_addr'). 3004 // (Secondary supers are interfaces and very deeply nested subtypes.) 3005 // This works in the same check above because of a tricky aliasing 3006 // between the super_cache and the primary super display elements. 3007 // (The 'super_check_addr' can address either, as the case requires.) 3008 // Note that the cache is updated below if it does not help us find 3009 // what we need immediately. 3010 // So if it was a primary super, we can just fail immediately. 3011 // Otherwise, it's the slow path for us (no success at this point). 3012 3013 // Hacked jmp, which may only be used just before L_fallthrough. 3014 #define final_jmp(label) \ 3015 if (&(label) == &L_fallthrough) { /*do nothing*/ } \ 3016 else { branch_optimized(Assembler::bcondAlways, label); } /*omit semicolon*/ 3017 3018 if (super_check_offset.is_register()) { 3019 branch_optimized(Assembler::bcondEqual, *L_success); 3020 z_cfi(super_check_offset.as_register(), sc_offset); 3021 if (L_failure == &L_fallthrough) { 3022 branch_optimized(Assembler::bcondEqual, *L_slow_path); 3023 } else { 3024 branch_optimized(Assembler::bcondNotEqual, *L_failure); 3025 final_jmp(*L_slow_path); 3026 } 3027 } else if (super_check_offset.as_constant() == sc_offset) { 3028 // Need a slow path; fast failure is impossible. 3029 if (L_slow_path == &L_fallthrough) { 3030 branch_optimized(Assembler::bcondEqual, *L_success); 3031 } else { 3032 branch_optimized(Assembler::bcondNotEqual, *L_slow_path); 3033 final_jmp(*L_success); 3034 } 3035 } else { 3036 // No slow path; it's a fast decision. 3037 if (L_failure == &L_fallthrough) { 3038 branch_optimized(Assembler::bcondEqual, *L_success); 3039 } else { 3040 branch_optimized(Assembler::bcondNotEqual, *L_failure); 3041 final_jmp(*L_success); 3042 } 3043 } 3044 3045 bind(L_fallthrough); 3046 #undef local_brc 3047 #undef final_jmp 3048 BLOCK_COMMENT("} check_klass_subtype_fast_path"); 3049 // fallthru (to slow path) 3050 } 3051 3052 void MacroAssembler::check_klass_subtype_slow_path(Register Rsubklass, 3053 Register Rsuperklass, 3054 Register Rarray_ptr, // tmp 3055 Register Rlength, // tmp 3056 Label* L_success, 3057 Label* L_failure) { 3058 // Input registers must not overlap. 3059 // Also check for R1 which is explicitely used here. 3060 assert_different_registers(Z_R1, Rsubklass, Rsuperklass, Rarray_ptr, Rlength); 3061 NearLabel L_fallthrough; 3062 int label_nulls = 0; 3063 if (L_success == NULL) { L_success = &L_fallthrough; label_nulls++; } 3064 if (L_failure == NULL) { L_failure = &L_fallthrough; label_nulls++; } 3065 assert(label_nulls <= 1, "at most one NULL in the batch"); 3066 3067 const int ss_offset = in_bytes(Klass::secondary_supers_offset()); 3068 const int sc_offset = in_bytes(Klass::secondary_super_cache_offset()); 3069 3070 const int length_offset = Array<Klass*>::length_offset_in_bytes(); 3071 const int base_offset = Array<Klass*>::base_offset_in_bytes(); 3072 3073 // Hacked jmp, which may only be used just before L_fallthrough. 3074 #define final_jmp(label) \ 3075 if (&(label) == &L_fallthrough) { /*do nothing*/ } \ 3076 else branch_optimized(Assembler::bcondAlways, label) /*omit semicolon*/ 3077 3078 NearLabel loop_iterate, loop_count, match; 3079 3080 BLOCK_COMMENT("check_klass_subtype_slow_path {"); 3081 z_lg(Rarray_ptr, ss_offset, Rsubklass); 3082 3083 load_and_test_int(Rlength, Address(Rarray_ptr, length_offset)); 3084 branch_optimized(Assembler::bcondZero, *L_failure); 3085 3086 // Oops in table are NO MORE compressed. 3087 z_cg(Rsuperklass, base_offset, Rarray_ptr); // Check array element for match. 3088 z_bre(match); // Shortcut for array length = 1. 3089 3090 // No match yet, so we must walk the array's elements. 3091 z_lngfr(Rlength, Rlength); 3092 z_sllg(Rlength, Rlength, LogBytesPerWord); // -#bytes of cache array 3093 z_llill(Z_R1, BytesPerWord); // Set increment/end index. 3094 add2reg(Rlength, 2 * BytesPerWord); // start index = -(n-2)*BytesPerWord 3095 z_slgr(Rarray_ptr, Rlength); // start addr: += (n-2)*BytesPerWord 3096 z_bru(loop_count); 3097 3098 BIND(loop_iterate); 3099 z_cg(Rsuperklass, base_offset, Rlength, Rarray_ptr); // Check array element for match. 3100 z_bre(match); 3101 BIND(loop_count); 3102 z_brxlg(Rlength, Z_R1, loop_iterate); 3103 3104 // Rsuperklass not found among secondary super classes -> failure. 3105 branch_optimized(Assembler::bcondAlways, *L_failure); 3106 3107 // Got a hit. Return success (zero result). Set cache. 3108 // Cache load doesn't happen here. For speed it is directly emitted by the compiler. 3109 3110 BIND(match); 3111 3112 z_stg(Rsuperklass, sc_offset, Rsubklass); // Save result to cache. 3113 3114 final_jmp(*L_success); 3115 3116 // Exit to the surrounding code. 3117 BIND(L_fallthrough); 3118 #undef local_brc 3119 #undef final_jmp 3120 BLOCK_COMMENT("} check_klass_subtype_slow_path"); 3121 } 3122 3123 // Emitter for combining fast and slow path. 3124 void MacroAssembler::check_klass_subtype(Register sub_klass, 3125 Register super_klass, 3126 Register temp1_reg, 3127 Register temp2_reg, 3128 Label& L_success) { 3129 NearLabel failure; 3130 BLOCK_COMMENT(err_msg("check_klass_subtype(%s subclass of %s) {", sub_klass->name(), super_klass->name())); 3131 check_klass_subtype_fast_path(sub_klass, super_klass, temp1_reg, 3132 &L_success, &failure, NULL); 3133 check_klass_subtype_slow_path(sub_klass, super_klass, 3134 temp1_reg, temp2_reg, &L_success, NULL); 3135 BIND(failure); 3136 BLOCK_COMMENT("} check_klass_subtype"); 3137 } 3138 3139 void MacroAssembler::clinit_barrier(Register klass, Register thread, Label* L_fast_path, Label* L_slow_path) { 3140 assert(L_fast_path != NULL || L_slow_path != NULL, "at least one is required"); 3141 3142 Label L_fallthrough; 3143 if (L_fast_path == NULL) { 3144 L_fast_path = &L_fallthrough; 3145 } else if (L_slow_path == NULL) { 3146 L_slow_path = &L_fallthrough; 3147 } 3148 3149 // Fast path check: class is fully initialized 3150 z_cli(Address(klass, InstanceKlass::init_state_offset()), InstanceKlass::fully_initialized); 3151 z_bre(*L_fast_path); 3152 3153 // Fast path check: current thread is initializer thread 3154 z_cg(thread, Address(klass, InstanceKlass::init_thread_offset())); 3155 if (L_slow_path == &L_fallthrough) { 3156 z_bre(*L_fast_path); 3157 } else if (L_fast_path == &L_fallthrough) { 3158 z_brne(*L_slow_path); 3159 } else { 3160 Unimplemented(); 3161 } 3162 3163 bind(L_fallthrough); 3164 } 3165 3166 // Increment a counter at counter_address when the eq condition code is 3167 // set. Kills registers tmp1_reg and tmp2_reg and preserves the condition code. 3168 void MacroAssembler::increment_counter_eq(address counter_address, Register tmp1_reg, Register tmp2_reg) { 3169 Label l; 3170 z_brne(l); 3171 load_const(tmp1_reg, counter_address); 3172 add2mem_32(Address(tmp1_reg), 1, tmp2_reg); 3173 z_cr(tmp1_reg, tmp1_reg); // Set cc to eq. 3174 bind(l); 3175 } 3176 3177 // Semantics are dependent on the slow_case label: 3178 // If the slow_case label is not NULL, failure to biased-lock the object 3179 // transfers control to the location of the slow_case label. If the 3180 // object could be biased-locked, control is transferred to the done label. 3181 // The condition code is unpredictable. 3182 // 3183 // If the slow_case label is NULL, failure to biased-lock the object results 3184 // in a transfer of control to the done label with a condition code of not_equal. 3185 // If the biased-lock could be successfully obtained, control is transfered to 3186 // the done label with a condition code of equal. 3187 // It is mandatory to react on the condition code At the done label. 3188 // 3189 void MacroAssembler::biased_locking_enter(Register obj_reg, 3190 Register mark_reg, 3191 Register temp_reg, 3192 Register temp2_reg, // May be Z_RO! 3193 Label &done, 3194 Label *slow_case) { 3195 assert(UseBiasedLocking, "why call this otherwise?"); 3196 assert_different_registers(obj_reg, mark_reg, temp_reg, temp2_reg); 3197 3198 Label cas_label; // Try, if implemented, CAS locking. Fall thru to slow path otherwise. 3199 3200 BLOCK_COMMENT("biased_locking_enter {"); 3201 3202 // Biased locking 3203 // See whether the lock is currently biased toward our thread and 3204 // whether the epoch is still valid. 3205 // Note that the runtime guarantees sufficient alignment of JavaThread 3206 // pointers to allow age to be placed into low bits. 3207 assert(markWord::age_shift == markWord::lock_bits + markWord::biased_lock_bits, 3208 "biased locking makes assumptions about bit layout"); 3209 z_lr(temp_reg, mark_reg); 3210 z_nilf(temp_reg, markWord::biased_lock_mask_in_place); 3211 z_chi(temp_reg, markWord::biased_lock_pattern); 3212 z_brne(cas_label); // Try cas if object is not biased, i.e. cannot be biased locked. 3213 3214 load_prototype_header(temp_reg, obj_reg); 3215 load_const_optimized(temp2_reg, ~((int) markWord::age_mask_in_place)); 3216 3217 z_ogr(temp_reg, Z_thread); 3218 z_xgr(temp_reg, mark_reg); 3219 z_ngr(temp_reg, temp2_reg); 3220 if (PrintBiasedLockingStatistics) { 3221 increment_counter_eq((address) BiasedLocking::biased_lock_entry_count_addr(), mark_reg, temp2_reg); 3222 // Restore mark_reg. 3223 z_lg(mark_reg, oopDesc::mark_offset_in_bytes(), obj_reg); 3224 } 3225 branch_optimized(Assembler::bcondEqual, done); // Biased lock obtained, return success. 3226 3227 Label try_revoke_bias; 3228 Label try_rebias; 3229 Address mark_addr = Address(obj_reg, oopDesc::mark_offset_in_bytes()); 3230 3231 //---------------------------------------------------------------------------- 3232 // At this point we know that the header has the bias pattern and 3233 // that we are not the bias owner in the current epoch. We need to 3234 // figure out more details about the state of the header in order to 3235 // know what operations can be legally performed on the object's 3236 // header. 3237 3238 // If the low three bits in the xor result aren't clear, that means 3239 // the prototype header is no longer biased and we have to revoke 3240 // the bias on this object. 3241 z_tmll(temp_reg, markWord::biased_lock_mask_in_place); 3242 z_brnaz(try_revoke_bias); 3243 3244 // Biasing is still enabled for this data type. See whether the 3245 // epoch of the current bias is still valid, meaning that the epoch 3246 // bits of the mark word are equal to the epoch bits of the 3247 // prototype header. (Note that the prototype header's epoch bits 3248 // only change at a safepoint.) If not, attempt to rebias the object 3249 // toward the current thread. Note that we must be absolutely sure 3250 // that the current epoch is invalid in order to do this because 3251 // otherwise the manipulations it performs on the mark word are 3252 // illegal. 3253 z_tmll(temp_reg, markWord::epoch_mask_in_place); 3254 z_brnaz(try_rebias); 3255 3256 //---------------------------------------------------------------------------- 3257 // The epoch of the current bias is still valid but we know nothing 3258 // about the owner; it might be set or it might be clear. Try to 3259 // acquire the bias of the object using an atomic operation. If this 3260 // fails we will go in to the runtime to revoke the object's bias. 3261 // Note that we first construct the presumed unbiased header so we 3262 // don't accidentally blow away another thread's valid bias. 3263 z_nilf(mark_reg, markWord::biased_lock_mask_in_place | markWord::age_mask_in_place | 3264 markWord::epoch_mask_in_place); 3265 z_lgr(temp_reg, Z_thread); 3266 z_llgfr(mark_reg, mark_reg); 3267 z_ogr(temp_reg, mark_reg); 3268 3269 assert(oopDesc::mark_offset_in_bytes() == 0, "offset of _mark is not 0"); 3270 3271 z_csg(mark_reg, temp_reg, 0, obj_reg); 3272 3273 // If the biasing toward our thread failed, this means that 3274 // another thread succeeded in biasing it toward itself and we 3275 // need to revoke that bias. The revocation will occur in the 3276 // interpreter runtime in the slow case. 3277 3278 if (PrintBiasedLockingStatistics) { 3279 increment_counter_eq((address) BiasedLocking::anonymously_biased_lock_entry_count_addr(), 3280 temp_reg, temp2_reg); 3281 } 3282 if (slow_case != NULL) { 3283 branch_optimized(Assembler::bcondNotEqual, *slow_case); // Biased lock not obtained, need to go the long way. 3284 } 3285 branch_optimized(Assembler::bcondAlways, done); // Biased lock status given in condition code. 3286 3287 //---------------------------------------------------------------------------- 3288 bind(try_rebias); 3289 // At this point we know the epoch has expired, meaning that the 3290 // current "bias owner", if any, is actually invalid. Under these 3291 // circumstances _only_, we are allowed to use the current header's 3292 // value as the comparison value when doing the cas to acquire the 3293 // bias in the current epoch. In other words, we allow transfer of 3294 // the bias from one thread to another directly in this situation. 3295 3296 z_nilf(mark_reg, markWord::biased_lock_mask_in_place | markWord::age_mask_in_place | markWord::epoch_mask_in_place); 3297 load_prototype_header(temp_reg, obj_reg); 3298 z_llgfr(mark_reg, mark_reg); 3299 3300 z_ogr(temp_reg, Z_thread); 3301 3302 assert(oopDesc::mark_offset_in_bytes() == 0, "offset of _mark is not 0"); 3303 3304 z_csg(mark_reg, temp_reg, 0, obj_reg); 3305 3306 // If the biasing toward our thread failed, this means that 3307 // another thread succeeded in biasing it toward itself and we 3308 // need to revoke that bias. The revocation will occur in the 3309 // interpreter runtime in the slow case. 3310 3311 if (PrintBiasedLockingStatistics) { 3312 increment_counter_eq((address) BiasedLocking::rebiased_lock_entry_count_addr(), temp_reg, temp2_reg); 3313 } 3314 if (slow_case != NULL) { 3315 branch_optimized(Assembler::bcondNotEqual, *slow_case); // Biased lock not obtained, need to go the long way. 3316 } 3317 z_bru(done); // Biased lock status given in condition code. 3318 3319 //---------------------------------------------------------------------------- 3320 bind(try_revoke_bias); 3321 // The prototype mark in the klass doesn't have the bias bit set any 3322 // more, indicating that objects of this data type are not supposed 3323 // to be biased any more. We are going to try to reset the mark of 3324 // this object to the prototype value and fall through to the 3325 // CAS-based locking scheme. Note that if our CAS fails, it means 3326 // that another thread raced us for the privilege of revoking the 3327 // bias of this particular object, so it's okay to continue in the 3328 // normal locking code. 3329 load_prototype_header(temp_reg, obj_reg); 3330 3331 assert(oopDesc::mark_offset_in_bytes() == 0, "offset of _mark is not 0"); 3332 3333 z_csg(mark_reg, temp_reg, 0, obj_reg); 3334 3335 // Fall through to the normal CAS-based lock, because no matter what 3336 // the result of the above CAS, some thread must have succeeded in 3337 // removing the bias bit from the object's header. 3338 if (PrintBiasedLockingStatistics) { 3339 // z_cgr(mark_reg, temp2_reg); 3340 increment_counter_eq((address) BiasedLocking::revoked_lock_entry_count_addr(), temp_reg, temp2_reg); 3341 } 3342 3343 bind(cas_label); 3344 BLOCK_COMMENT("} biased_locking_enter"); 3345 } 3346 3347 void MacroAssembler::biased_locking_exit(Register mark_addr, Register temp_reg, Label& done) { 3348 // Check for biased locking unlock case, which is a no-op 3349 // Note: we do not have to check the thread ID for two reasons. 3350 // First, the interpreter checks for IllegalMonitorStateException at 3351 // a higher level. Second, if the bias was revoked while we held the 3352 // lock, the object could not be rebiased toward another thread, so 3353 // the bias bit would be clear. 3354 BLOCK_COMMENT("biased_locking_exit {"); 3355 3356 z_lg(temp_reg, 0, mark_addr); 3357 z_nilf(temp_reg, markWord::biased_lock_mask_in_place); 3358 3359 z_chi(temp_reg, markWord::biased_lock_pattern); 3360 z_bre(done); 3361 BLOCK_COMMENT("} biased_locking_exit"); 3362 } 3363 3364 void MacroAssembler::compiler_fast_lock_object(Register oop, Register box, Register temp1, Register temp2, bool try_bias) { 3365 Register displacedHeader = temp1; 3366 Register currentHeader = temp1; 3367 Register temp = temp2; 3368 NearLabel done, object_has_monitor; 3369 3370 BLOCK_COMMENT("compiler_fast_lock_object {"); 3371 3372 // Load markWord from oop into mark. 3373 z_lg(displacedHeader, 0, oop); 3374 3375 if (try_bias) { 3376 biased_locking_enter(oop, displacedHeader, temp, Z_R0, done); 3377 } 3378 3379 // Handle existing monitor. 3380 // The object has an existing monitor iff (mark & monitor_value) != 0. 3381 guarantee(Immediate::is_uimm16(markWord::monitor_value), "must be half-word"); 3382 z_lr(temp, displacedHeader); 3383 z_nill(temp, markWord::monitor_value); 3384 z_brne(object_has_monitor); 3385 3386 // Set mark to markWord | markWord::unlocked_value. 3387 z_oill(displacedHeader, markWord::unlocked_value); 3388 3389 // Load Compare Value application register. 3390 3391 // Initialize the box (must happen before we update the object mark). 3392 z_stg(displacedHeader, BasicLock::displaced_header_offset_in_bytes(), box); 3393 3394 // Memory Fence (in cmpxchgd) 3395 // Compare object markWord with mark and if equal exchange scratch1 with object markWord. 3396 3397 // If the compare-and-swap succeeded, then we found an unlocked object and we 3398 // have now locked it. 3399 z_csg(displacedHeader, box, 0, oop); 3400 assert(currentHeader==displacedHeader, "must be same register"); // Identified two registers from z/Architecture. 3401 z_bre(done); 3402 3403 // We did not see an unlocked object so try the fast recursive case. 3404 3405 z_sgr(currentHeader, Z_SP); 3406 load_const_optimized(temp, (~(os::vm_page_size()-1) | markWord::lock_mask_in_place)); 3407 3408 z_ngr(currentHeader, temp); 3409 // z_brne(done); 3410 // z_release(); 3411 z_stg(currentHeader/*==0 or not 0*/, BasicLock::displaced_header_offset_in_bytes(), box); 3412 3413 z_bru(done); 3414 3415 Register zero = temp; 3416 Register monitor_tagged = displacedHeader; // Tagged with markWord::monitor_value. 3417 bind(object_has_monitor); 3418 // The object's monitor m is unlocked iff m->owner == NULL, 3419 // otherwise m->owner may contain a thread or a stack address. 3420 // 3421 // Try to CAS m->owner from NULL to current thread. 3422 z_lghi(zero, 0); 3423 // If m->owner is null, then csg succeeds and sets m->owner=THREAD and CR=EQ. 3424 z_csg(zero, Z_thread, OM_OFFSET_NO_MONITOR_VALUE_TAG(owner), monitor_tagged); 3425 // Store a non-null value into the box. 3426 z_stg(box, BasicLock::displaced_header_offset_in_bytes(), box); 3427 #ifdef ASSERT 3428 z_brne(done); 3429 // We've acquired the monitor, check some invariants. 3430 // Invariant 1: _recursions should be 0. 3431 asm_assert_mem8_is_zero(OM_OFFSET_NO_MONITOR_VALUE_TAG(recursions), monitor_tagged, 3432 "monitor->_recursions should be 0", -1); 3433 z_ltgr(zero, zero); // Set CR=EQ. 3434 #endif 3435 bind(done); 3436 3437 BLOCK_COMMENT("} compiler_fast_lock_object"); 3438 // If locking was successful, CR should indicate 'EQ'. 3439 // The compiler or the native wrapper generates a branch to the runtime call 3440 // _complete_monitor_locking_Java. 3441 } 3442 3443 void MacroAssembler::compiler_fast_unlock_object(Register oop, Register box, Register temp1, Register temp2, bool try_bias) { 3444 Register displacedHeader = temp1; 3445 Register currentHeader = temp2; 3446 Register temp = temp1; 3447 Register monitor = temp2; 3448 3449 Label done, object_has_monitor; 3450 3451 BLOCK_COMMENT("compiler_fast_unlock_object {"); 3452 3453 if (try_bias) { 3454 biased_locking_exit(oop, currentHeader, done); 3455 } 3456 3457 // Find the lock address and load the displaced header from the stack. 3458 // if the displaced header is zero, we have a recursive unlock. 3459 load_and_test_long(displacedHeader, Address(box, BasicLock::displaced_header_offset_in_bytes())); 3460 z_bre(done); 3461 3462 // Handle existing monitor. 3463 // The object has an existing monitor iff (mark & monitor_value) != 0. 3464 z_lg(currentHeader, oopDesc::mark_offset_in_bytes(), oop); 3465 guarantee(Immediate::is_uimm16(markWord::monitor_value), "must be half-word"); 3466 z_nill(currentHeader, markWord::monitor_value); 3467 z_brne(object_has_monitor); 3468 3469 // Check if it is still a light weight lock, this is true if we see 3470 // the stack address of the basicLock in the markWord of the object 3471 // copy box to currentHeader such that csg does not kill it. 3472 z_lgr(currentHeader, box); 3473 z_csg(currentHeader, displacedHeader, 0, oop); 3474 z_bru(done); // Csg sets CR as desired. 3475 3476 // Handle existing monitor. 3477 bind(object_has_monitor); 3478 z_lg(currentHeader, oopDesc::mark_offset_in_bytes(), oop); // CurrentHeader is tagged with monitor_value set. 3479 load_and_test_long(temp, Address(currentHeader, OM_OFFSET_NO_MONITOR_VALUE_TAG(recursions))); 3480 z_brne(done); 3481 load_and_test_long(temp, Address(currentHeader, OM_OFFSET_NO_MONITOR_VALUE_TAG(owner))); 3482 z_brne(done); 3483 load_and_test_long(temp, Address(currentHeader, OM_OFFSET_NO_MONITOR_VALUE_TAG(EntryList))); 3484 z_brne(done); 3485 load_and_test_long(temp, Address(currentHeader, OM_OFFSET_NO_MONITOR_VALUE_TAG(cxq))); 3486 z_brne(done); 3487 z_release(); 3488 z_stg(temp/*=0*/, OM_OFFSET_NO_MONITOR_VALUE_TAG(owner), currentHeader); 3489 3490 bind(done); 3491 3492 BLOCK_COMMENT("} compiler_fast_unlock_object"); 3493 // flag == EQ indicates success 3494 // flag == NE indicates failure 3495 } 3496 3497 void MacroAssembler::resolve_jobject(Register value, Register tmp1, Register tmp2) { 3498 BarrierSetAssembler* bs = BarrierSet::barrier_set()->barrier_set_assembler(); 3499 bs->resolve_jobject(this, value, tmp1, tmp2); 3500 } 3501 3502 // Last_Java_sp must comply to the rules in frame_s390.hpp. 3503 void MacroAssembler::set_last_Java_frame(Register last_Java_sp, Register last_Java_pc, bool allow_relocation) { 3504 BLOCK_COMMENT("set_last_Java_frame {"); 3505 3506 // Always set last_Java_pc and flags first because once last_Java_sp 3507 // is visible has_last_Java_frame is true and users will look at the 3508 // rest of the fields. (Note: flags should always be zero before we 3509 // get here so doesn't need to be set.) 3510 3511 // Verify that last_Java_pc was zeroed on return to Java. 3512 if (allow_relocation) { 3513 asm_assert_mem8_is_zero(in_bytes(JavaThread::last_Java_pc_offset()), 3514 Z_thread, 3515 "last_Java_pc not zeroed before leaving Java", 3516 0x200); 3517 } else { 3518 asm_assert_mem8_is_zero_static(in_bytes(JavaThread::last_Java_pc_offset()), 3519 Z_thread, 3520 "last_Java_pc not zeroed before leaving Java", 3521 0x200); 3522 } 3523 3524 // When returning from calling out from Java mode the frame anchor's 3525 // last_Java_pc will always be set to NULL. It is set here so that 3526 // if we are doing a call to native (not VM) that we capture the 3527 // known pc and don't have to rely on the native call having a 3528 // standard frame linkage where we can find the pc. 3529 if (last_Java_pc!=noreg) { 3530 z_stg(last_Java_pc, Address(Z_thread, JavaThread::last_Java_pc_offset())); 3531 } 3532 3533 // This membar release is not required on z/Architecture, since the sequence of stores 3534 // in maintained. Nevertheless, we leave it in to document the required ordering. 3535 // The implementation of z_release() should be empty. 3536 // z_release(); 3537 3538 z_stg(last_Java_sp, Address(Z_thread, JavaThread::last_Java_sp_offset())); 3539 BLOCK_COMMENT("} set_last_Java_frame"); 3540 } 3541 3542 void MacroAssembler::reset_last_Java_frame(bool allow_relocation) { 3543 BLOCK_COMMENT("reset_last_Java_frame {"); 3544 3545 if (allow_relocation) { 3546 asm_assert_mem8_isnot_zero(in_bytes(JavaThread::last_Java_sp_offset()), 3547 Z_thread, 3548 "SP was not set, still zero", 3549 0x202); 3550 } else { 3551 asm_assert_mem8_isnot_zero_static(in_bytes(JavaThread::last_Java_sp_offset()), 3552 Z_thread, 3553 "SP was not set, still zero", 3554 0x202); 3555 } 3556 3557 // _last_Java_sp = 0 3558 // Clearing storage must be atomic here, so don't use clear_mem()! 3559 store_const(Address(Z_thread, JavaThread::last_Java_sp_offset()), 0); 3560 3561 // _last_Java_pc = 0 3562 store_const(Address(Z_thread, JavaThread::last_Java_pc_offset()), 0); 3563 3564 BLOCK_COMMENT("} reset_last_Java_frame"); 3565 return; 3566 } 3567 3568 void MacroAssembler::set_top_ijava_frame_at_SP_as_last_Java_frame(Register sp, Register tmp1, bool allow_relocation) { 3569 assert_different_registers(sp, tmp1); 3570 3571 // We cannot trust that code generated by the C++ compiler saves R14 3572 // to z_abi_160.return_pc, because sometimes it spills R14 using stmg at 3573 // z_abi_160.gpr14 (e.g. InterpreterRuntime::_new()). 3574 // Therefore we load the PC into tmp1 and let set_last_Java_frame() save 3575 // it into the frame anchor. 3576 get_PC(tmp1); 3577 set_last_Java_frame(/*sp=*/sp, /*pc=*/tmp1, allow_relocation); 3578 } 3579 3580 void MacroAssembler::set_thread_state(JavaThreadState new_state) { 3581 z_release(); 3582 3583 assert(Immediate::is_uimm16(_thread_max_state), "enum value out of range for instruction"); 3584 assert(sizeof(JavaThreadState) == sizeof(int), "enum value must have base type int"); 3585 store_const(Address(Z_thread, JavaThread::thread_state_offset()), new_state, Z_R0, false); 3586 } 3587 3588 void MacroAssembler::get_vm_result(Register oop_result) { 3589 verify_thread(); 3590 3591 z_lg(oop_result, Address(Z_thread, JavaThread::vm_result_offset())); 3592 clear_mem(Address(Z_thread, JavaThread::vm_result_offset()), sizeof(void*)); 3593 3594 verify_oop(oop_result); 3595 } 3596 3597 void MacroAssembler::get_vm_result_2(Register result) { 3598 verify_thread(); 3599 3600 z_lg(result, Address(Z_thread, JavaThread::vm_result_2_offset())); 3601 clear_mem(Address(Z_thread, JavaThread::vm_result_2_offset()), sizeof(void*)); 3602 } 3603 3604 // We require that C code which does not return a value in vm_result will 3605 // leave it undisturbed. 3606 void MacroAssembler::set_vm_result(Register oop_result) { 3607 z_stg(oop_result, Address(Z_thread, JavaThread::vm_result_offset())); 3608 } 3609 3610 // Explicit null checks (used for method handle code). 3611 void MacroAssembler::null_check(Register reg, Register tmp, int64_t offset) { 3612 if (!ImplicitNullChecks) { 3613 NearLabel ok; 3614 3615 compare64_and_branch(reg, (intptr_t) 0, Assembler::bcondNotEqual, ok); 3616 3617 // We just put the address into reg if it was 0 (tmp==Z_R0 is allowed so we can't use it for the address). 3618 address exception_entry = Interpreter::throw_NullPointerException_entry(); 3619 load_absolute_address(reg, exception_entry); 3620 z_br(reg); 3621 3622 bind(ok); 3623 } else { 3624 if (needs_explicit_null_check((intptr_t)offset)) { 3625 // Provoke OS NULL exception if reg = NULL by 3626 // accessing M[reg] w/o changing any registers. 3627 z_lg(tmp, 0, reg); 3628 } 3629 // else 3630 // Nothing to do, (later) access of M[reg + offset] 3631 // will provoke OS NULL exception if reg = NULL. 3632 } 3633 } 3634 3635 //------------------------------------- 3636 // Compressed Klass Pointers 3637 //------------------------------------- 3638 3639 // Klass oop manipulations if compressed. 3640 void MacroAssembler::encode_klass_not_null(Register dst, Register src) { 3641 Register current = (src != noreg) ? src : dst; // Klass is in dst if no src provided. (dst == src) also possible. 3642 address base = CompressedKlassPointers::base(); 3643 int shift = CompressedKlassPointers::shift(); 3644 assert(UseCompressedClassPointers, "only for compressed klass ptrs"); 3645 3646 BLOCK_COMMENT("cKlass encoder {"); 3647 3648 #ifdef ASSERT 3649 Label ok; 3650 z_tmll(current, KlassAlignmentInBytes-1); // Check alignment. 3651 z_brc(Assembler::bcondAllZero, ok); 3652 // The plain disassembler does not recognize illtrap. It instead displays 3653 // a 32-bit value. Issueing two illtraps assures the disassembler finds 3654 // the proper beginning of the next instruction. 3655 z_illtrap(0xee); 3656 z_illtrap(0xee); 3657 bind(ok); 3658 #endif 3659 3660 if (base != NULL) { 3661 unsigned int base_h = ((unsigned long)base)>>32; 3662 unsigned int base_l = (unsigned int)((unsigned long)base); 3663 if ((base_h != 0) && (base_l == 0) && VM_Version::has_HighWordInstr()) { 3664 lgr_if_needed(dst, current); 3665 z_aih(dst, -((int)base_h)); // Base has no set bits in lower half. 3666 } else if ((base_h == 0) && (base_l != 0)) { 3667 lgr_if_needed(dst, current); 3668 z_agfi(dst, -(int)base_l); 3669 } else { 3670 load_const(Z_R0, base); 3671 lgr_if_needed(dst, current); 3672 z_sgr(dst, Z_R0); 3673 } 3674 current = dst; 3675 } 3676 if (shift != 0) { 3677 assert (LogKlassAlignmentInBytes == shift, "decode alg wrong"); 3678 z_srlg(dst, current, shift); 3679 current = dst; 3680 } 3681 lgr_if_needed(dst, current); // Move may be required (if neither base nor shift != 0). 3682 3683 BLOCK_COMMENT("} cKlass encoder"); 3684 } 3685 3686 // This function calculates the size of the code generated by 3687 // decode_klass_not_null(register dst, Register src) 3688 // when (Universe::heap() != NULL). Hence, if the instructions 3689 // it generates change, then this method needs to be updated. 3690 int MacroAssembler::instr_size_for_decode_klass_not_null() { 3691 address base = CompressedKlassPointers::base(); 3692 int shift_size = CompressedKlassPointers::shift() == 0 ? 0 : 6; /* sllg */ 3693 int addbase_size = 0; 3694 assert(UseCompressedClassPointers, "only for compressed klass ptrs"); 3695 3696 if (base != NULL) { 3697 unsigned int base_h = ((unsigned long)base)>>32; 3698 unsigned int base_l = (unsigned int)((unsigned long)base); 3699 if ((base_h != 0) && (base_l == 0) && VM_Version::has_HighWordInstr()) { 3700 addbase_size += 6; /* aih */ 3701 } else if ((base_h == 0) && (base_l != 0)) { 3702 addbase_size += 6; /* algfi */ 3703 } else { 3704 addbase_size += load_const_size(); 3705 addbase_size += 4; /* algr */ 3706 } 3707 } 3708 #ifdef ASSERT 3709 addbase_size += 10; 3710 addbase_size += 2; // Extra sigill. 3711 #endif 3712 return addbase_size + shift_size; 3713 } 3714 3715 // !!! If the instructions that get generated here change 3716 // then function instr_size_for_decode_klass_not_null() 3717 // needs to get updated. 3718 // This variant of decode_klass_not_null() must generate predictable code! 3719 // The code must only depend on globally known parameters. 3720 void MacroAssembler::decode_klass_not_null(Register dst) { 3721 address base = CompressedKlassPointers::base(); 3722 int shift = CompressedKlassPointers::shift(); 3723 int beg_off = offset(); 3724 assert(UseCompressedClassPointers, "only for compressed klass ptrs"); 3725 3726 BLOCK_COMMENT("cKlass decoder (const size) {"); 3727 3728 if (shift != 0) { // Shift required? 3729 z_sllg(dst, dst, shift); 3730 } 3731 if (base != NULL) { 3732 unsigned int base_h = ((unsigned long)base)>>32; 3733 unsigned int base_l = (unsigned int)((unsigned long)base); 3734 if ((base_h != 0) && (base_l == 0) && VM_Version::has_HighWordInstr()) { 3735 z_aih(dst, base_h); // Base has no set bits in lower half. 3736 } else if ((base_h == 0) && (base_l != 0)) { 3737 z_algfi(dst, base_l); // Base has no set bits in upper half. 3738 } else { 3739 load_const(Z_R0, base); // Base has set bits everywhere. 3740 z_algr(dst, Z_R0); 3741 } 3742 } 3743 3744 #ifdef ASSERT 3745 Label ok; 3746 z_tmll(dst, KlassAlignmentInBytes-1); // Check alignment. 3747 z_brc(Assembler::bcondAllZero, ok); 3748 // The plain disassembler does not recognize illtrap. It instead displays 3749 // a 32-bit value. Issueing two illtraps assures the disassembler finds 3750 // the proper beginning of the next instruction. 3751 z_illtrap(0xd1); 3752 z_illtrap(0xd1); 3753 bind(ok); 3754 #endif 3755 assert(offset() == beg_off + instr_size_for_decode_klass_not_null(), "Code gen mismatch."); 3756 3757 BLOCK_COMMENT("} cKlass decoder (const size)"); 3758 } 3759 3760 // This variant of decode_klass_not_null() is for cases where 3761 // 1) the size of the generated instructions may vary 3762 // 2) the result is (potentially) stored in a register different from the source. 3763 void MacroAssembler::decode_klass_not_null(Register dst, Register src) { 3764 address base = CompressedKlassPointers::base(); 3765 int shift = CompressedKlassPointers::shift(); 3766 assert(UseCompressedClassPointers, "only for compressed klass ptrs"); 3767 3768 BLOCK_COMMENT("cKlass decoder {"); 3769 3770 if (src == noreg) src = dst; 3771 3772 if (shift != 0) { // Shift or at least move required? 3773 z_sllg(dst, src, shift); 3774 } else { 3775 lgr_if_needed(dst, src); 3776 } 3777 3778 if (base != NULL) { 3779 unsigned int base_h = ((unsigned long)base)>>32; 3780 unsigned int base_l = (unsigned int)((unsigned long)base); 3781 if ((base_h != 0) && (base_l == 0) && VM_Version::has_HighWordInstr()) { 3782 z_aih(dst, base_h); // Base has not set bits in lower half. 3783 } else if ((base_h == 0) && (base_l != 0)) { 3784 z_algfi(dst, base_l); // Base has no set bits in upper half. 3785 } else { 3786 load_const_optimized(Z_R0, base); // Base has set bits everywhere. 3787 z_algr(dst, Z_R0); 3788 } 3789 } 3790 3791 #ifdef ASSERT 3792 Label ok; 3793 z_tmll(dst, KlassAlignmentInBytes-1); // Check alignment. 3794 z_brc(Assembler::bcondAllZero, ok); 3795 // The plain disassembler does not recognize illtrap. It instead displays 3796 // a 32-bit value. Issueing two illtraps assures the disassembler finds 3797 // the proper beginning of the next instruction. 3798 z_illtrap(0xd2); 3799 z_illtrap(0xd2); 3800 bind(ok); 3801 #endif 3802 BLOCK_COMMENT("} cKlass decoder"); 3803 } 3804 3805 void MacroAssembler::load_klass(Register klass, Address mem) { 3806 if (UseCompressedClassPointers) { 3807 z_llgf(klass, mem); 3808 // Attention: no null check here! 3809 decode_klass_not_null(klass); 3810 } else { 3811 z_lg(klass, mem); 3812 } 3813 } 3814 3815 void MacroAssembler::load_klass(Register klass, Register src_oop) { 3816 if (UseCompressedClassPointers) { 3817 z_llgf(klass, oopDesc::klass_offset_in_bytes(), src_oop); 3818 // Attention: no null check here! 3819 decode_klass_not_null(klass); 3820 } else { 3821 z_lg(klass, oopDesc::klass_offset_in_bytes(), src_oop); 3822 } 3823 } 3824 3825 void MacroAssembler::load_prototype_header(Register Rheader, Register Rsrc_oop) { 3826 assert_different_registers(Rheader, Rsrc_oop); 3827 load_klass(Rheader, Rsrc_oop); 3828 z_lg(Rheader, Address(Rheader, Klass::prototype_header_offset())); 3829 } 3830 3831 void MacroAssembler::store_klass(Register klass, Register dst_oop, Register ck) { 3832 if (UseCompressedClassPointers) { 3833 assert_different_registers(dst_oop, klass, Z_R0); 3834 if (ck == noreg) ck = klass; 3835 encode_klass_not_null(ck, klass); 3836 z_st(ck, Address(dst_oop, oopDesc::klass_offset_in_bytes())); 3837 } else { 3838 z_stg(klass, Address(dst_oop, oopDesc::klass_offset_in_bytes())); 3839 } 3840 } 3841 3842 void MacroAssembler::store_klass_gap(Register s, Register d) { 3843 if (UseCompressedClassPointers) { 3844 assert(s != d, "not enough registers"); 3845 // Support s = noreg. 3846 if (s != noreg) { 3847 z_st(s, Address(d, oopDesc::klass_gap_offset_in_bytes())); 3848 } else { 3849 z_mvhi(Address(d, oopDesc::klass_gap_offset_in_bytes()), 0); 3850 } 3851 } 3852 } 3853 3854 // Compare klass ptr in memory against klass ptr in register. 3855 // 3856 // Rop1 - klass in register, always uncompressed. 3857 // disp - Offset of klass in memory, compressed/uncompressed, depending on runtime flag. 3858 // Rbase - Base address of cKlass in memory. 3859 // maybeNULL - True if Rop1 possibly is a NULL. 3860 void MacroAssembler::compare_klass_ptr(Register Rop1, int64_t disp, Register Rbase, bool maybeNULL) { 3861 3862 BLOCK_COMMENT("compare klass ptr {"); 3863 3864 if (UseCompressedClassPointers) { 3865 const int shift = CompressedKlassPointers::shift(); 3866 address base = CompressedKlassPointers::base(); 3867 3868 assert((shift == 0) || (shift == LogKlassAlignmentInBytes), "cKlass encoder detected bad shift"); 3869 assert_different_registers(Rop1, Z_R0); 3870 assert_different_registers(Rop1, Rbase, Z_R1); 3871 3872 // First encode register oop and then compare with cOop in memory. 3873 // This sequence saves an unnecessary cOop load and decode. 3874 if (base == NULL) { 3875 if (shift == 0) { 3876 z_cl(Rop1, disp, Rbase); // Unscaled 3877 } else { 3878 z_srlg(Z_R0, Rop1, shift); // ZeroBased 3879 z_cl(Z_R0, disp, Rbase); 3880 } 3881 } else { // HeapBased 3882 #ifdef ASSERT 3883 bool used_R0 = true; 3884 bool used_R1 = true; 3885 #endif 3886 Register current = Rop1; 3887 Label done; 3888 3889 if (maybeNULL) { // NULL ptr must be preserved! 3890 z_ltgr(Z_R0, current); 3891 z_bre(done); 3892 current = Z_R0; 3893 } 3894 3895 unsigned int base_h = ((unsigned long)base)>>32; 3896 unsigned int base_l = (unsigned int)((unsigned long)base); 3897 if ((base_h != 0) && (base_l == 0) && VM_Version::has_HighWordInstr()) { 3898 lgr_if_needed(Z_R0, current); 3899 z_aih(Z_R0, -((int)base_h)); // Base has no set bits in lower half. 3900 } else if ((base_h == 0) && (base_l != 0)) { 3901 lgr_if_needed(Z_R0, current); 3902 z_agfi(Z_R0, -(int)base_l); 3903 } else { 3904 int pow2_offset = get_oop_base_complement(Z_R1, ((uint64_t)(intptr_t)base)); 3905 add2reg_with_index(Z_R0, pow2_offset, Z_R1, Rop1); // Subtract base by adding complement. 3906 } 3907 3908 if (shift != 0) { 3909 z_srlg(Z_R0, Z_R0, shift); 3910 } 3911 bind(done); 3912 z_cl(Z_R0, disp, Rbase); 3913 #ifdef ASSERT 3914 if (used_R0) preset_reg(Z_R0, 0xb05bUL, 2); 3915 if (used_R1) preset_reg(Z_R1, 0xb06bUL, 2); 3916 #endif 3917 } 3918 } else { 3919 z_clg(Rop1, disp, Z_R0, Rbase); 3920 } 3921 BLOCK_COMMENT("} compare klass ptr"); 3922 } 3923 3924 //--------------------------- 3925 // Compressed oops 3926 //--------------------------- 3927 3928 void MacroAssembler::encode_heap_oop(Register oop) { 3929 oop_encoder(oop, oop, true /*maybe null*/); 3930 } 3931 3932 void MacroAssembler::encode_heap_oop_not_null(Register oop) { 3933 oop_encoder(oop, oop, false /*not null*/); 3934 } 3935 3936 // Called with something derived from the oop base. e.g. oop_base>>3. 3937 int MacroAssembler::get_oop_base_pow2_offset(uint64_t oop_base) { 3938 unsigned int oop_base_ll = ((unsigned int)(oop_base >> 0)) & 0xffff; 3939 unsigned int oop_base_lh = ((unsigned int)(oop_base >> 16)) & 0xffff; 3940 unsigned int oop_base_hl = ((unsigned int)(oop_base >> 32)) & 0xffff; 3941 unsigned int oop_base_hh = ((unsigned int)(oop_base >> 48)) & 0xffff; 3942 unsigned int n_notzero_parts = (oop_base_ll == 0 ? 0:1) 3943 + (oop_base_lh == 0 ? 0:1) 3944 + (oop_base_hl == 0 ? 0:1) 3945 + (oop_base_hh == 0 ? 0:1); 3946 3947 assert(oop_base != 0, "This is for HeapBased cOops only"); 3948 3949 if (n_notzero_parts != 1) { // Check if oop_base is just a few pages shy of a power of 2. 3950 uint64_t pow2_offset = 0x10000 - oop_base_ll; 3951 if (pow2_offset < 0x8000) { // This might not be necessary. 3952 uint64_t oop_base2 = oop_base + pow2_offset; 3953 3954 oop_base_ll = ((unsigned int)(oop_base2 >> 0)) & 0xffff; 3955 oop_base_lh = ((unsigned int)(oop_base2 >> 16)) & 0xffff; 3956 oop_base_hl = ((unsigned int)(oop_base2 >> 32)) & 0xffff; 3957 oop_base_hh = ((unsigned int)(oop_base2 >> 48)) & 0xffff; 3958 n_notzero_parts = (oop_base_ll == 0 ? 0:1) + 3959 (oop_base_lh == 0 ? 0:1) + 3960 (oop_base_hl == 0 ? 0:1) + 3961 (oop_base_hh == 0 ? 0:1); 3962 if (n_notzero_parts == 1) { 3963 assert(-(int64_t)pow2_offset != (int64_t)-1, "We use -1 to signal uninitialized base register"); 3964 return -pow2_offset; 3965 } 3966 } 3967 } 3968 return 0; 3969 } 3970 3971 // If base address is offset from a straight power of two by just a few pages, 3972 // return this offset to the caller for a possible later composite add. 3973 // TODO/FIX: will only work correctly for 4k pages. 3974 int MacroAssembler::get_oop_base(Register Rbase, uint64_t oop_base) { 3975 int pow2_offset = get_oop_base_pow2_offset(oop_base); 3976 3977 load_const_optimized(Rbase, oop_base - pow2_offset); // Best job possible. 3978 3979 return pow2_offset; 3980 } 3981 3982 int MacroAssembler::get_oop_base_complement(Register Rbase, uint64_t oop_base) { 3983 int offset = get_oop_base(Rbase, oop_base); 3984 z_lcgr(Rbase, Rbase); 3985 return -offset; 3986 } 3987 3988 // Compare compressed oop in memory against oop in register. 3989 // Rop1 - Oop in register. 3990 // disp - Offset of cOop in memory. 3991 // Rbase - Base address of cOop in memory. 3992 // maybeNULL - True if Rop1 possibly is a NULL. 3993 // maybeNULLtarget - Branch target for Rop1 == NULL, if flow control shall NOT continue with compare instruction. 3994 void MacroAssembler::compare_heap_oop(Register Rop1, Address mem, bool maybeNULL) { 3995 Register Rbase = mem.baseOrR0(); 3996 Register Rindex = mem.indexOrR0(); 3997 int64_t disp = mem.disp(); 3998 3999 const int shift = CompressedOops::shift(); 4000 address base = CompressedOops::base(); 4001 4002 assert(UseCompressedOops, "must be on to call this method"); 4003 assert(Universe::heap() != NULL, "java heap must be initialized to call this method"); 4004 assert((shift == 0) || (shift == LogMinObjAlignmentInBytes), "cOop encoder detected bad shift"); 4005 assert_different_registers(Rop1, Z_R0); 4006 assert_different_registers(Rop1, Rbase, Z_R1); 4007 assert_different_registers(Rop1, Rindex, Z_R1); 4008 4009 BLOCK_COMMENT("compare heap oop {"); 4010 4011 // First encode register oop and then compare with cOop in memory. 4012 // This sequence saves an unnecessary cOop load and decode. 4013 if (base == NULL) { 4014 if (shift == 0) { 4015 z_cl(Rop1, disp, Rindex, Rbase); // Unscaled 4016 } else { 4017 z_srlg(Z_R0, Rop1, shift); // ZeroBased 4018 z_cl(Z_R0, disp, Rindex, Rbase); 4019 } 4020 } else { // HeapBased 4021 #ifdef ASSERT 4022 bool used_R0 = true; 4023 bool used_R1 = true; 4024 #endif 4025 Label done; 4026 int pow2_offset = get_oop_base_complement(Z_R1, ((uint64_t)(intptr_t)base)); 4027 4028 if (maybeNULL) { // NULL ptr must be preserved! 4029 z_ltgr(Z_R0, Rop1); 4030 z_bre(done); 4031 } 4032 4033 add2reg_with_index(Z_R0, pow2_offset, Z_R1, Rop1); 4034 z_srlg(Z_R0, Z_R0, shift); 4035 4036 bind(done); 4037 z_cl(Z_R0, disp, Rindex, Rbase); 4038 #ifdef ASSERT 4039 if (used_R0) preset_reg(Z_R0, 0xb05bUL, 2); 4040 if (used_R1) preset_reg(Z_R1, 0xb06bUL, 2); 4041 #endif 4042 } 4043 BLOCK_COMMENT("} compare heap oop"); 4044 } 4045 4046 void MacroAssembler::access_store_at(BasicType type, DecoratorSet decorators, 4047 const Address& addr, Register val, 4048 Register tmp1, Register tmp2, Register tmp3) { 4049 assert((decorators & ~(AS_RAW | IN_HEAP | IN_NATIVE | IS_ARRAY | IS_NOT_NULL | 4050 ON_UNKNOWN_OOP_REF)) == 0, "unsupported decorator"); 4051 BarrierSetAssembler* bs = BarrierSet::barrier_set()->barrier_set_assembler(); 4052 decorators = AccessInternal::decorator_fixup(decorators); 4053 bool as_raw = (decorators & AS_RAW) != 0; 4054 if (as_raw) { 4055 bs->BarrierSetAssembler::store_at(this, decorators, type, 4056 addr, val, 4057 tmp1, tmp2, tmp3); 4058 } else { 4059 bs->store_at(this, decorators, type, 4060 addr, val, 4061 tmp1, tmp2, tmp3); 4062 } 4063 } 4064 4065 void MacroAssembler::access_load_at(BasicType type, DecoratorSet decorators, 4066 const Address& addr, Register dst, 4067 Register tmp1, Register tmp2, Label *is_null) { 4068 assert((decorators & ~(AS_RAW | IN_HEAP | IN_NATIVE | IS_ARRAY | IS_NOT_NULL | 4069 ON_PHANTOM_OOP_REF | ON_WEAK_OOP_REF)) == 0, "unsupported decorator"); 4070 BarrierSetAssembler* bs = BarrierSet::barrier_set()->barrier_set_assembler(); 4071 decorators = AccessInternal::decorator_fixup(decorators); 4072 bool as_raw = (decorators & AS_RAW) != 0; 4073 if (as_raw) { 4074 bs->BarrierSetAssembler::load_at(this, decorators, type, 4075 addr, dst, 4076 tmp1, tmp2, is_null); 4077 } else { 4078 bs->load_at(this, decorators, type, 4079 addr, dst, 4080 tmp1, tmp2, is_null); 4081 } 4082 } 4083 4084 void MacroAssembler::load_heap_oop(Register dest, const Address &a, 4085 Register tmp1, Register tmp2, 4086 DecoratorSet decorators, Label *is_null) { 4087 access_load_at(T_OBJECT, IN_HEAP | decorators, a, dest, tmp1, tmp2, is_null); 4088 } 4089 4090 void MacroAssembler::store_heap_oop(Register Roop, const Address &a, 4091 Register tmp1, Register tmp2, Register tmp3, 4092 DecoratorSet decorators) { 4093 access_store_at(T_OBJECT, IN_HEAP | decorators, a, Roop, tmp1, tmp2, tmp3); 4094 } 4095 4096 //------------------------------------------------- 4097 // Encode compressed oop. Generally usable encoder. 4098 //------------------------------------------------- 4099 // Rsrc - contains regular oop on entry. It remains unchanged. 4100 // Rdst - contains compressed oop on exit. 4101 // Rdst and Rsrc may indicate same register, in which case Rsrc does not remain unchanged. 4102 // 4103 // Rdst must not indicate scratch register Z_R1 (Z_R1_scratch) for functionality. 4104 // Rdst should not indicate scratch register Z_R0 (Z_R0_scratch) for performance. 4105 // 4106 // only32bitValid is set, if later code only uses the lower 32 bits. In this 4107 // case we must not fix the upper 32 bits. 4108 void MacroAssembler::oop_encoder(Register Rdst, Register Rsrc, bool maybeNULL, 4109 Register Rbase, int pow2_offset, bool only32bitValid) { 4110 4111 const address oop_base = CompressedOops::base(); 4112 const int oop_shift = CompressedOops::shift(); 4113 const bool disjoint = CompressedOops::base_disjoint(); 4114 4115 assert(UseCompressedOops, "must be on to call this method"); 4116 assert(Universe::heap() != NULL, "java heap must be initialized to call this encoder"); 4117 assert((oop_shift == 0) || (oop_shift == LogMinObjAlignmentInBytes), "cOop encoder detected bad shift"); 4118 4119 if (disjoint || (oop_base == NULL)) { 4120 BLOCK_COMMENT("cOop encoder zeroBase {"); 4121 if (oop_shift == 0) { 4122 if (oop_base != NULL && !only32bitValid) { 4123 z_llgfr(Rdst, Rsrc); // Clear upper bits in case the register will be decoded again. 4124 } else { 4125 lgr_if_needed(Rdst, Rsrc); 4126 } 4127 } else { 4128 z_srlg(Rdst, Rsrc, oop_shift); 4129 if (oop_base != NULL && !only32bitValid) { 4130 z_llgfr(Rdst, Rdst); // Clear upper bits in case the register will be decoded again. 4131 } 4132 } 4133 BLOCK_COMMENT("} cOop encoder zeroBase"); 4134 return; 4135 } 4136 4137 bool used_R0 = false; 4138 bool used_R1 = false; 4139 4140 BLOCK_COMMENT("cOop encoder general {"); 4141 assert_different_registers(Rdst, Z_R1); 4142 assert_different_registers(Rsrc, Rbase); 4143 if (maybeNULL) { 4144 Label done; 4145 // We reorder shifting and subtracting, so that we can compare 4146 // and shift in parallel: 4147 // 4148 // cycle 0: potential LoadN, base = <const> 4149 // cycle 1: base = !base dst = src >> 3, cmp cr = (src != 0) 4150 // cycle 2: if (cr) br, dst = dst + base + offset 4151 4152 // Get oop_base components. 4153 if (pow2_offset == -1) { 4154 if (Rdst == Rbase) { 4155 if (Rdst == Z_R1 || Rsrc == Z_R1) { 4156 Rbase = Z_R0; 4157 used_R0 = true; 4158 } else { 4159 Rdst = Z_R1; 4160 used_R1 = true; 4161 } 4162 } 4163 if (Rbase == Z_R1) { 4164 used_R1 = true; 4165 } 4166 pow2_offset = get_oop_base_complement(Rbase, ((uint64_t)(intptr_t)oop_base) >> oop_shift); 4167 } 4168 assert_different_registers(Rdst, Rbase); 4169 4170 // Check for NULL oop (must be left alone) and shift. 4171 if (oop_shift != 0) { // Shift out alignment bits 4172 if (((intptr_t)oop_base&0xc000000000000000L) == 0L) { // We are sure: no single address will have the leftmost bit set. 4173 z_srag(Rdst, Rsrc, oop_shift); // Arithmetic shift sets the condition code. 4174 } else { 4175 z_srlg(Rdst, Rsrc, oop_shift); 4176 z_ltgr(Rsrc, Rsrc); // This is the recommended way of testing for zero. 4177 // This probably is faster, as it does not write a register. No! 4178 // z_cghi(Rsrc, 0); 4179 } 4180 } else { 4181 z_ltgr(Rdst, Rsrc); // Move NULL to result register. 4182 } 4183 z_bre(done); 4184 4185 // Subtract oop_base components. 4186 if ((Rdst == Z_R0) || (Rbase == Z_R0)) { 4187 z_algr(Rdst, Rbase); 4188 if (pow2_offset != 0) { add2reg(Rdst, pow2_offset); } 4189 } else { 4190 add2reg_with_index(Rdst, pow2_offset, Rbase, Rdst); 4191 } 4192 if (!only32bitValid) { 4193 z_llgfr(Rdst, Rdst); // Clear upper bits in case the register will be decoded again. 4194 } 4195 bind(done); 4196 4197 } else { // not null 4198 // Get oop_base components. 4199 if (pow2_offset == -1) { 4200 pow2_offset = get_oop_base_complement(Rbase, (uint64_t)(intptr_t)oop_base); 4201 } 4202 4203 // Subtract oop_base components and shift. 4204 if (Rdst == Z_R0 || Rsrc == Z_R0 || Rbase == Z_R0) { 4205 // Don't use lay instruction. 4206 if (Rdst == Rsrc) { 4207 z_algr(Rdst, Rbase); 4208 } else { 4209 lgr_if_needed(Rdst, Rbase); 4210 z_algr(Rdst, Rsrc); 4211 } 4212 if (pow2_offset != 0) add2reg(Rdst, pow2_offset); 4213 } else { 4214 add2reg_with_index(Rdst, pow2_offset, Rbase, Rsrc); 4215 } 4216 if (oop_shift != 0) { // Shift out alignment bits. 4217 z_srlg(Rdst, Rdst, oop_shift); 4218 } 4219 if (!only32bitValid) { 4220 z_llgfr(Rdst, Rdst); // Clear upper bits in case the register will be decoded again. 4221 } 4222 } 4223 #ifdef ASSERT 4224 if (used_R0 && Rdst != Z_R0 && Rsrc != Z_R0) { preset_reg(Z_R0, 0xb01bUL, 2); } 4225 if (used_R1 && Rdst != Z_R1 && Rsrc != Z_R1) { preset_reg(Z_R1, 0xb02bUL, 2); } 4226 #endif 4227 BLOCK_COMMENT("} cOop encoder general"); 4228 } 4229 4230 //------------------------------------------------- 4231 // decode compressed oop. Generally usable decoder. 4232 //------------------------------------------------- 4233 // Rsrc - contains compressed oop on entry. 4234 // Rdst - contains regular oop on exit. 4235 // Rdst and Rsrc may indicate same register. 4236 // Rdst must not be the same register as Rbase, if Rbase was preloaded (before call). 4237 // Rdst can be the same register as Rbase. Then, either Z_R0 or Z_R1 must be available as scratch. 4238 // Rbase - register to use for the base 4239 // pow2_offset - offset of base to nice value. If -1, base must be loaded. 4240 // For performance, it is good to 4241 // - avoid Z_R0 for any of the argument registers. 4242 // - keep Rdst and Rsrc distinct from Rbase. Rdst == Rsrc is ok for performance. 4243 // - avoid Z_R1 for Rdst if Rdst == Rbase. 4244 void MacroAssembler::oop_decoder(Register Rdst, Register Rsrc, bool maybeNULL, Register Rbase, int pow2_offset) { 4245 4246 const address oop_base = CompressedOops::base(); 4247 const int oop_shift = CompressedOops::shift(); 4248 const bool disjoint = CompressedOops::base_disjoint(); 4249 4250 assert(UseCompressedOops, "must be on to call this method"); 4251 assert(Universe::heap() != NULL, "java heap must be initialized to call this decoder"); 4252 assert((oop_shift == 0) || (oop_shift == LogMinObjAlignmentInBytes), 4253 "cOop encoder detected bad shift"); 4254 4255 // cOops are always loaded zero-extended from memory. No explicit zero-extension necessary. 4256 4257 if (oop_base != NULL) { 4258 unsigned int oop_base_hl = ((unsigned int)((uint64_t)(intptr_t)oop_base >> 32)) & 0xffff; 4259 unsigned int oop_base_hh = ((unsigned int)((uint64_t)(intptr_t)oop_base >> 48)) & 0xffff; 4260 unsigned int oop_base_hf = ((unsigned int)((uint64_t)(intptr_t)oop_base >> 32)) & 0xFFFFffff; 4261 if (disjoint && (oop_base_hl == 0 || oop_base_hh == 0)) { 4262 BLOCK_COMMENT("cOop decoder disjointBase {"); 4263 // We do not need to load the base. Instead, we can install the upper bits 4264 // with an OR instead of an ADD. 4265 Label done; 4266 4267 // Rsrc contains a narrow oop. Thus we are sure the leftmost <oop_shift> bits will never be set. 4268 if (maybeNULL) { // NULL ptr must be preserved! 4269 z_slag(Rdst, Rsrc, oop_shift); // Arithmetic shift sets the condition code. 4270 z_bre(done); 4271 } else { 4272 z_sllg(Rdst, Rsrc, oop_shift); // Logical shift leaves condition code alone. 4273 } 4274 if ((oop_base_hl != 0) && (oop_base_hh != 0)) { 4275 z_oihf(Rdst, oop_base_hf); 4276 } else if (oop_base_hl != 0) { 4277 z_oihl(Rdst, oop_base_hl); 4278 } else { 4279 assert(oop_base_hh != 0, "not heapbased mode"); 4280 z_oihh(Rdst, oop_base_hh); 4281 } 4282 bind(done); 4283 BLOCK_COMMENT("} cOop decoder disjointBase"); 4284 } else { 4285 BLOCK_COMMENT("cOop decoder general {"); 4286 // There are three decode steps: 4287 // scale oop offset (shift left) 4288 // get base (in reg) and pow2_offset (constant) 4289 // add base, pow2_offset, and oop offset 4290 // The following register overlap situations may exist: 4291 // Rdst == Rsrc, Rbase any other 4292 // not a problem. Scaling in-place leaves Rbase undisturbed. 4293 // Loading Rbase does not impact the scaled offset. 4294 // Rdst == Rbase, Rsrc any other 4295 // scaling would destroy a possibly preloaded Rbase. Loading Rbase 4296 // would destroy the scaled offset. 4297 // Remedy: use Rdst_tmp if Rbase has been preloaded. 4298 // use Rbase_tmp if base has to be loaded. 4299 // Rsrc == Rbase, Rdst any other 4300 // Only possible without preloaded Rbase. 4301 // Loading Rbase does not destroy compressed oop because it was scaled into Rdst before. 4302 // Rsrc == Rbase, Rdst == Rbase 4303 // Only possible without preloaded Rbase. 4304 // Loading Rbase would destroy compressed oop. Scaling in-place is ok. 4305 // Remedy: use Rbase_tmp. 4306 // 4307 Label done; 4308 Register Rdst_tmp = Rdst; 4309 Register Rbase_tmp = Rbase; 4310 bool used_R0 = false; 4311 bool used_R1 = false; 4312 bool base_preloaded = pow2_offset >= 0; 4313 guarantee(!(base_preloaded && (Rsrc == Rbase)), "Register clash, check caller"); 4314 assert(oop_shift != 0, "room for optimization"); 4315 4316 // Check if we need to use scratch registers. 4317 if (Rdst == Rbase) { 4318 assert(!(((Rdst == Z_R0) && (Rsrc == Z_R1)) || ((Rdst == Z_R1) && (Rsrc == Z_R0))), "need a scratch reg"); 4319 if (Rdst != Rsrc) { 4320 if (base_preloaded) { Rdst_tmp = (Rdst == Z_R1) ? Z_R0 : Z_R1; } 4321 else { Rbase_tmp = (Rdst == Z_R1) ? Z_R0 : Z_R1; } 4322 } else { 4323 Rbase_tmp = (Rdst == Z_R1) ? Z_R0 : Z_R1; 4324 } 4325 } 4326 if (base_preloaded) lgr_if_needed(Rbase_tmp, Rbase); 4327 4328 // Scale oop and check for NULL. 4329 // Rsrc contains a narrow oop. Thus we are sure the leftmost <oop_shift> bits will never be set. 4330 if (maybeNULL) { // NULL ptr must be preserved! 4331 z_slag(Rdst_tmp, Rsrc, oop_shift); // Arithmetic shift sets the condition code. 4332 z_bre(done); 4333 } else { 4334 z_sllg(Rdst_tmp, Rsrc, oop_shift); // Logical shift leaves condition code alone. 4335 } 4336 4337 // Get oop_base components. 4338 if (!base_preloaded) { 4339 pow2_offset = get_oop_base(Rbase_tmp, (uint64_t)(intptr_t)oop_base); 4340 } 4341 4342 // Add up all components. 4343 if ((Rbase_tmp == Z_R0) || (Rdst_tmp == Z_R0)) { 4344 z_algr(Rdst_tmp, Rbase_tmp); 4345 if (pow2_offset != 0) { add2reg(Rdst_tmp, pow2_offset); } 4346 } else { 4347 add2reg_with_index(Rdst_tmp, pow2_offset, Rbase_tmp, Rdst_tmp); 4348 } 4349 4350 bind(done); 4351 lgr_if_needed(Rdst, Rdst_tmp); 4352 #ifdef ASSERT 4353 if (used_R0 && Rdst != Z_R0 && Rsrc != Z_R0) { preset_reg(Z_R0, 0xb03bUL, 2); } 4354 if (used_R1 && Rdst != Z_R1 && Rsrc != Z_R1) { preset_reg(Z_R1, 0xb04bUL, 2); } 4355 #endif 4356 BLOCK_COMMENT("} cOop decoder general"); 4357 } 4358 } else { 4359 BLOCK_COMMENT("cOop decoder zeroBase {"); 4360 if (oop_shift == 0) { 4361 lgr_if_needed(Rdst, Rsrc); 4362 } else { 4363 z_sllg(Rdst, Rsrc, oop_shift); 4364 } 4365 BLOCK_COMMENT("} cOop decoder zeroBase"); 4366 } 4367 } 4368 4369 // ((OopHandle)result).resolve(); 4370 void MacroAssembler::resolve_oop_handle(Register result) { 4371 // OopHandle::resolve is an indirection. 4372 z_lg(result, 0, result); 4373 } 4374 4375 void MacroAssembler::load_mirror_from_const_method(Register mirror, Register const_method) { 4376 mem2reg_opt(mirror, Address(const_method, ConstMethod::constants_offset())); 4377 mem2reg_opt(mirror, Address(mirror, ConstantPool::pool_holder_offset_in_bytes())); 4378 mem2reg_opt(mirror, Address(mirror, Klass::java_mirror_offset())); 4379 resolve_oop_handle(mirror); 4380 } 4381 4382 void MacroAssembler::load_method_holder(Register holder, Register method) { 4383 mem2reg_opt(holder, Address(method, Method::const_offset())); 4384 mem2reg_opt(holder, Address(holder, ConstMethod::constants_offset())); 4385 mem2reg_opt(holder, Address(holder, ConstantPool::pool_holder_offset_in_bytes())); 4386 } 4387 4388 //--------------------------------------------------------------- 4389 //--- Operations on arrays. 4390 //--------------------------------------------------------------- 4391 4392 // Compiler ensures base is doubleword aligned and cnt is #doublewords. 4393 // Emitter does not KILL cnt and base arguments, since they need to be copied to 4394 // work registers anyway. 4395 // Actually, only r0, r1, and r5 are killed. 4396 unsigned int MacroAssembler::Clear_Array(Register cnt_arg, Register base_pointer_arg, Register odd_tmp_reg) { 4397 4398 int block_start = offset(); 4399 Register dst_len = Z_R1; // Holds dst len for MVCLE. 4400 Register dst_addr = Z_R0; // Holds dst addr for MVCLE. 4401 4402 Label doXC, doMVCLE, done; 4403 4404 BLOCK_COMMENT("Clear_Array {"); 4405 4406 // Check for zero len and convert to long. 4407 z_ltgfr(odd_tmp_reg, cnt_arg); 4408 z_bre(done); // Nothing to do if len == 0. 4409 4410 // Prefetch data to be cleared. 4411 if (VM_Version::has_Prefetch()) { 4412 z_pfd(0x02, 0, Z_R0, base_pointer_arg); 4413 z_pfd(0x02, 256, Z_R0, base_pointer_arg); 4414 } 4415 4416 z_sllg(dst_len, odd_tmp_reg, 3); // #bytes to clear. 4417 z_cghi(odd_tmp_reg, 32); // Check for len <= 256 bytes (<=32 DW). 4418 z_brnh(doXC); // If so, use executed XC to clear. 4419 4420 // MVCLE: initialize long arrays (general case). 4421 bind(doMVCLE); 4422 z_lgr(dst_addr, base_pointer_arg); 4423 // Pass 0 as source length to MVCLE: destination will be filled with padding byte 0. 4424 // The even register of the register pair is not killed. 4425 clear_reg(odd_tmp_reg, true, false); 4426 MacroAssembler::move_long_ext(dst_addr, as_Register(odd_tmp_reg->encoding()-1), 0); 4427 z_bru(done); 4428 4429 // XC: initialize short arrays. 4430 Label XC_template; // Instr template, never exec directly! 4431 bind(XC_template); 4432 z_xc(0,0,base_pointer_arg,0,base_pointer_arg); 4433 4434 bind(doXC); 4435 add2reg(dst_len, -1); // Get #bytes-1 for EXECUTE. 4436 if (VM_Version::has_ExecuteExtensions()) { 4437 z_exrl(dst_len, XC_template); // Execute XC with var. len. 4438 } else { 4439 z_larl(odd_tmp_reg, XC_template); 4440 z_ex(dst_len,0,Z_R0,odd_tmp_reg); // Execute XC with var. len. 4441 } 4442 // z_bru(done); // fallthru 4443 4444 bind(done); 4445 4446 BLOCK_COMMENT("} Clear_Array"); 4447 4448 int block_end = offset(); 4449 return block_end - block_start; 4450 } 4451 4452 // Compiler ensures base is doubleword aligned and cnt is count of doublewords. 4453 // Emitter does not KILL any arguments nor work registers. 4454 // Emitter generates up to 16 XC instructions, depending on the array length. 4455 unsigned int MacroAssembler::Clear_Array_Const(long cnt, Register base) { 4456 int block_start = offset(); 4457 int off; 4458 int lineSize_Bytes = AllocatePrefetchStepSize; 4459 int lineSize_DW = AllocatePrefetchStepSize>>LogBytesPerWord; 4460 bool doPrefetch = VM_Version::has_Prefetch(); 4461 int XC_maxlen = 256; 4462 int numXCInstr = cnt > 0 ? (cnt*BytesPerWord-1)/XC_maxlen+1 : 0; 4463 4464 BLOCK_COMMENT("Clear_Array_Const {"); 4465 assert(cnt*BytesPerWord <= 4096, "ClearArrayConst can handle 4k only"); 4466 4467 // Do less prefetching for very short arrays. 4468 if (numXCInstr > 0) { 4469 // Prefetch only some cache lines, then begin clearing. 4470 if (doPrefetch) { 4471 if (cnt*BytesPerWord <= lineSize_Bytes/4) { // If less than 1/4 of a cache line to clear, 4472 z_pfd(0x02, 0, Z_R0, base); // prefetch just the first cache line. 4473 } else { 4474 assert(XC_maxlen == lineSize_Bytes, "ClearArrayConst needs 256B cache lines"); 4475 for (off = 0; (off < AllocatePrefetchLines) && (off <= numXCInstr); off ++) { 4476 z_pfd(0x02, off*lineSize_Bytes, Z_R0, base); 4477 } 4478 } 4479 } 4480 4481 for (off=0; off<(numXCInstr-1); off++) { 4482 z_xc(off*XC_maxlen, XC_maxlen-1, base, off*XC_maxlen, base); 4483 4484 // Prefetch some cache lines in advance. 4485 if (doPrefetch && (off <= numXCInstr-AllocatePrefetchLines)) { 4486 z_pfd(0x02, (off+AllocatePrefetchLines)*lineSize_Bytes, Z_R0, base); 4487 } 4488 } 4489 if (off*XC_maxlen < cnt*BytesPerWord) { 4490 z_xc(off*XC_maxlen, (cnt*BytesPerWord-off*XC_maxlen)-1, base, off*XC_maxlen, base); 4491 } 4492 } 4493 BLOCK_COMMENT("} Clear_Array_Const"); 4494 4495 int block_end = offset(); 4496 return block_end - block_start; 4497 } 4498 4499 // Compiler ensures base is doubleword aligned and cnt is #doublewords. 4500 // Emitter does not KILL cnt and base arguments, since they need to be copied to 4501 // work registers anyway. 4502 // Actually, only r0, r1, (which are work registers) and odd_tmp_reg are killed. 4503 // 4504 // For very large arrays, exploit MVCLE H/W support. 4505 // MVCLE instruction automatically exploits H/W-optimized page mover. 4506 // - Bytes up to next page boundary are cleared with a series of XC to self. 4507 // - All full pages are cleared with the page mover H/W assist. 4508 // - Remaining bytes are again cleared by a series of XC to self. 4509 // 4510 unsigned int MacroAssembler::Clear_Array_Const_Big(long cnt, Register base_pointer_arg, Register odd_tmp_reg) { 4511 4512 int block_start = offset(); 4513 Register dst_len = Z_R1; // Holds dst len for MVCLE. 4514 Register dst_addr = Z_R0; // Holds dst addr for MVCLE. 4515 4516 BLOCK_COMMENT("Clear_Array_Const_Big {"); 4517 4518 // Get len to clear. 4519 load_const_optimized(dst_len, (long)cnt*8L); // in Bytes = #DW*8 4520 4521 // Prepare other args to MVCLE. 4522 z_lgr(dst_addr, base_pointer_arg); 4523 // Pass 0 as source length to MVCLE: destination will be filled with padding byte 0. 4524 // The even register of the register pair is not killed. 4525 (void) clear_reg(odd_tmp_reg, true, false); // Src len of MVCLE is zero. 4526 MacroAssembler::move_long_ext(dst_addr, as_Register(odd_tmp_reg->encoding() - 1), 0); 4527 BLOCK_COMMENT("} Clear_Array_Const_Big"); 4528 4529 int block_end = offset(); 4530 return block_end - block_start; 4531 } 4532 4533 // Allocator. 4534 unsigned int MacroAssembler::CopyRawMemory_AlignedDisjoint(Register src_reg, Register dst_reg, 4535 Register cnt_reg, 4536 Register tmp1_reg, Register tmp2_reg) { 4537 // Tmp1 is oddReg. 4538 // Tmp2 is evenReg. 4539 4540 int block_start = offset(); 4541 Label doMVC, doMVCLE, done, MVC_template; 4542 4543 BLOCK_COMMENT("CopyRawMemory_AlignedDisjoint {"); 4544 4545 // Check for zero len and convert to long. 4546 z_ltgfr(cnt_reg, cnt_reg); // Remember casted value for doSTG case. 4547 z_bre(done); // Nothing to do if len == 0. 4548 4549 z_sllg(Z_R1, cnt_reg, 3); // Dst len in bytes. calc early to have the result ready. 4550 4551 z_cghi(cnt_reg, 32); // Check for len <= 256 bytes (<=32 DW). 4552 z_brnh(doMVC); // If so, use executed MVC to clear. 4553 4554 bind(doMVCLE); // A lot of data (more than 256 bytes). 4555 // Prep dest reg pair. 4556 z_lgr(Z_R0, dst_reg); // dst addr 4557 // Dst len already in Z_R1. 4558 // Prep src reg pair. 4559 z_lgr(tmp2_reg, src_reg); // src addr 4560 z_lgr(tmp1_reg, Z_R1); // Src len same as dst len. 4561 4562 // Do the copy. 4563 move_long_ext(Z_R0, tmp2_reg, 0xb0); // Bypass cache. 4564 z_bru(done); // All done. 4565 4566 bind(MVC_template); // Just some data (not more than 256 bytes). 4567 z_mvc(0, 0, dst_reg, 0, src_reg); 4568 4569 bind(doMVC); 4570 4571 if (VM_Version::has_ExecuteExtensions()) { 4572 add2reg(Z_R1, -1); 4573 } else { 4574 add2reg(tmp1_reg, -1, Z_R1); 4575 z_larl(Z_R1, MVC_template); 4576 } 4577 4578 if (VM_Version::has_Prefetch()) { 4579 z_pfd(1, 0,Z_R0,src_reg); 4580 z_pfd(2, 0,Z_R0,dst_reg); 4581 // z_pfd(1,256,Z_R0,src_reg); // Assume very short copy. 4582 // z_pfd(2,256,Z_R0,dst_reg); 4583 } 4584 4585 if (VM_Version::has_ExecuteExtensions()) { 4586 z_exrl(Z_R1, MVC_template); 4587 } else { 4588 z_ex(tmp1_reg, 0, Z_R0, Z_R1); 4589 } 4590 4591 bind(done); 4592 4593 BLOCK_COMMENT("} CopyRawMemory_AlignedDisjoint"); 4594 4595 int block_end = offset(); 4596 return block_end - block_start; 4597 } 4598 4599 //------------------------------------------------------ 4600 // Special String Intrinsics. Implementation 4601 //------------------------------------------------------ 4602 4603 // Intrinsics for CompactStrings 4604 4605 // Compress char[] to byte[]. 4606 // Restores: src, dst 4607 // Uses: cnt 4608 // Kills: tmp, Z_R0, Z_R1. 4609 // Early clobber: result. 4610 // Note: 4611 // cnt is signed int. Do not rely on high word! 4612 // counts # characters, not bytes. 4613 // The result is the number of characters copied before the first incompatible character was found. 4614 // If precise is true, the processing stops exactly at this point. Otherwise, the result may be off 4615 // by a few bytes. The result always indicates the number of copied characters. 4616 // When used as a character index, the returned value points to the first incompatible character. 4617 // 4618 // Note: Does not behave exactly like package private StringUTF16 compress java implementation in case of failure: 4619 // - Different number of characters may have been written to dead array (if precise is false). 4620 // - Returns a number <cnt instead of 0. (Result gets compared with cnt.) 4621 unsigned int MacroAssembler::string_compress(Register result, Register src, Register dst, Register cnt, 4622 Register tmp, bool precise) { 4623 assert_different_registers(Z_R0, Z_R1, result, src, dst, cnt, tmp); 4624 4625 if (precise) { 4626 BLOCK_COMMENT("encode_iso_array {"); 4627 } else { 4628 BLOCK_COMMENT("string_compress {"); 4629 } 4630 int block_start = offset(); 4631 4632 Register Rsrc = src; 4633 Register Rdst = dst; 4634 Register Rix = tmp; 4635 Register Rcnt = cnt; 4636 Register Rmask = result; // holds incompatibility check mask until result value is stored. 4637 Label ScalarShortcut, AllDone; 4638 4639 z_iilf(Rmask, 0xFF00FF00); 4640 z_iihf(Rmask, 0xFF00FF00); 4641 4642 #if 0 // Sacrifice shortcuts for code compactness 4643 { 4644 //---< shortcuts for short strings (very frequent) >--- 4645 // Strings with 4 and 8 characters were fond to occur very frequently. 4646 // Therefore, we handle them right away with minimal overhead. 4647 Label skipShortcut, skip4Shortcut, skip8Shortcut; 4648 Register Rout = Z_R0; 4649 z_chi(Rcnt, 4); 4650 z_brne(skip4Shortcut); // 4 characters are very frequent 4651 z_lg(Z_R0, 0, Rsrc); // Treat exactly 4 characters specially. 4652 if (VM_Version::has_DistinctOpnds()) { 4653 Rout = Z_R0; 4654 z_ngrk(Rix, Z_R0, Rmask); 4655 } else { 4656 Rout = Rix; 4657 z_lgr(Rix, Z_R0); 4658 z_ngr(Z_R0, Rmask); 4659 } 4660 z_brnz(skipShortcut); 4661 z_stcmh(Rout, 5, 0, Rdst); 4662 z_stcm(Rout, 5, 2, Rdst); 4663 z_lgfr(result, Rcnt); 4664 z_bru(AllDone); 4665 bind(skip4Shortcut); 4666 4667 z_chi(Rcnt, 8); 4668 z_brne(skip8Shortcut); // There's more to do... 4669 z_lmg(Z_R0, Z_R1, 0, Rsrc); // Treat exactly 8 characters specially. 4670 if (VM_Version::has_DistinctOpnds()) { 4671 Rout = Z_R0; 4672 z_ogrk(Rix, Z_R0, Z_R1); 4673 z_ngr(Rix, Rmask); 4674 } else { 4675 Rout = Rix; 4676 z_lgr(Rix, Z_R0); 4677 z_ogr(Z_R0, Z_R1); 4678 z_ngr(Z_R0, Rmask); 4679 } 4680 z_brnz(skipShortcut); 4681 z_stcmh(Rout, 5, 0, Rdst); 4682 z_stcm(Rout, 5, 2, Rdst); 4683 z_stcmh(Z_R1, 5, 4, Rdst); 4684 z_stcm(Z_R1, 5, 6, Rdst); 4685 z_lgfr(result, Rcnt); 4686 z_bru(AllDone); 4687 4688 bind(skip8Shortcut); 4689 clear_reg(Z_R0, true, false); // #characters already processed (none). Precond for scalar loop. 4690 z_brl(ScalarShortcut); // Just a few characters 4691 4692 bind(skipShortcut); 4693 } 4694 #endif 4695 clear_reg(Z_R0); // make sure register is properly initialized. 4696 4697 if (VM_Version::has_VectorFacility()) { 4698 const int min_vcnt = 32; // Minimum #characters required to use vector instructions. 4699 // Otherwise just do nothing in vector mode. 4700 // Must be multiple of 2*(vector register length in chars (8 HW = 128 bits)). 4701 const int log_min_vcnt = exact_log2(min_vcnt); 4702 Label VectorLoop, VectorDone, VectorBreak; 4703 4704 VectorRegister Vtmp1 = Z_V16; 4705 VectorRegister Vtmp2 = Z_V17; 4706 VectorRegister Vmask = Z_V18; 4707 VectorRegister Vzero = Z_V19; 4708 VectorRegister Vsrc_first = Z_V20; 4709 VectorRegister Vsrc_last = Z_V23; 4710 4711 assert((Vsrc_last->encoding() - Vsrc_first->encoding() + 1) == min_vcnt/8, "logic error"); 4712 assert(VM_Version::has_DistinctOpnds(), "Assumption when has_VectorFacility()"); 4713 z_srak(Rix, Rcnt, log_min_vcnt); // # vector loop iterations 4714 z_brz(VectorDone); // not enough data for vector loop 4715 4716 z_vzero(Vzero); // all zeroes 4717 z_vgmh(Vmask, 0, 7); // generate 0xff00 mask for all 2-byte elements 4718 z_sllg(Z_R0, Rix, log_min_vcnt); // remember #chars that will be processed by vector loop 4719 4720 bind(VectorLoop); 4721 z_vlm(Vsrc_first, Vsrc_last, 0, Rsrc); 4722 add2reg(Rsrc, min_vcnt*2); 4723 4724 //---< check for incompatible character >--- 4725 z_vo(Vtmp1, Z_V20, Z_V21); 4726 z_vo(Vtmp2, Z_V22, Z_V23); 4727 z_vo(Vtmp1, Vtmp1, Vtmp2); 4728 z_vn(Vtmp1, Vtmp1, Vmask); 4729 z_vceqhs(Vtmp1, Vtmp1, Vzero); // high half of all chars must be zero for successful compress. 4730 z_bvnt(VectorBreak); // break vector loop if not all vector elements compare eq -> incompatible character found. 4731 // re-process data from current iteration in break handler. 4732 4733 //---< pack & store characters >--- 4734 z_vpkh(Vtmp1, Z_V20, Z_V21); // pack (src1, src2) -> tmp1 4735 z_vpkh(Vtmp2, Z_V22, Z_V23); // pack (src3, src4) -> tmp2 4736 z_vstm(Vtmp1, Vtmp2, 0, Rdst); // store packed string 4737 add2reg(Rdst, min_vcnt); 4738 4739 z_brct(Rix, VectorLoop); 4740 4741 z_bru(VectorDone); 4742 4743 bind(VectorBreak); 4744 add2reg(Rsrc, -min_vcnt*2); // Fix Rsrc. Rsrc was already updated, but Rdst and Rix are not. 4745 z_sll(Rix, log_min_vcnt); // # chars processed so far in VectorLoop, excl. current iteration. 4746 z_sr(Z_R0, Rix); // correct # chars processed in total. 4747 4748 bind(VectorDone); 4749 } 4750 4751 { 4752 const int min_cnt = 8; // Minimum #characters required to use unrolled loop. 4753 // Otherwise just do nothing in unrolled loop. 4754 // Must be multiple of 8. 4755 const int log_min_cnt = exact_log2(min_cnt); 4756 Label UnrolledLoop, UnrolledDone, UnrolledBreak; 4757 4758 if (VM_Version::has_DistinctOpnds()) { 4759 z_srk(Rix, Rcnt, Z_R0); // remaining # chars to compress in unrolled loop 4760 } else { 4761 z_lr(Rix, Rcnt); 4762 z_sr(Rix, Z_R0); 4763 } 4764 z_sra(Rix, log_min_cnt); // unrolled loop count 4765 z_brz(UnrolledDone); 4766 4767 bind(UnrolledLoop); 4768 z_lmg(Z_R0, Z_R1, 0, Rsrc); 4769 if (precise) { 4770 z_ogr(Z_R1, Z_R0); // check all 8 chars for incompatibility 4771 z_ngr(Z_R1, Rmask); 4772 z_brnz(UnrolledBreak); 4773 4774 z_lg(Z_R1, 8, Rsrc); // reload destroyed register 4775 z_stcmh(Z_R0, 5, 0, Rdst); 4776 z_stcm(Z_R0, 5, 2, Rdst); 4777 } else { 4778 z_stcmh(Z_R0, 5, 0, Rdst); 4779 z_stcm(Z_R0, 5, 2, Rdst); 4780 4781 z_ogr(Z_R0, Z_R1); 4782 z_ngr(Z_R0, Rmask); 4783 z_brnz(UnrolledBreak); 4784 } 4785 z_stcmh(Z_R1, 5, 4, Rdst); 4786 z_stcm(Z_R1, 5, 6, Rdst); 4787 4788 add2reg(Rsrc, min_cnt*2); 4789 add2reg(Rdst, min_cnt); 4790 z_brct(Rix, UnrolledLoop); 4791 4792 z_lgfr(Z_R0, Rcnt); // # chars processed in total after unrolled loop. 4793 z_nilf(Z_R0, ~(min_cnt-1)); 4794 z_tmll(Rcnt, min_cnt-1); 4795 z_brnaz(ScalarShortcut); // if all bits zero, there is nothing left to do for scalar loop. 4796 // Rix == 0 in all cases. 4797 z_sllg(Z_R1, Rcnt, 1); // # src bytes already processed. Only lower 32 bits are valid! 4798 // Z_R1 contents must be treated as unsigned operand! For huge strings, 4799 // (Rcnt >= 2**30), the value may spill into the sign bit by sllg. 4800 z_lgfr(result, Rcnt); // all characters processed. 4801 z_slgfr(Rdst, Rcnt); // restore ptr 4802 z_slgfr(Rsrc, Z_R1); // restore ptr, double the element count for Rsrc restore 4803 z_bru(AllDone); 4804 4805 bind(UnrolledBreak); 4806 z_lgfr(Z_R0, Rcnt); // # chars processed in total after unrolled loop 4807 z_nilf(Z_R0, ~(min_cnt-1)); 4808 z_sll(Rix, log_min_cnt); // # chars not yet processed in UnrolledLoop (due to break), broken iteration not included. 4809 z_sr(Z_R0, Rix); // fix # chars processed OK so far. 4810 if (!precise) { 4811 z_lgfr(result, Z_R0); 4812 z_sllg(Z_R1, Z_R0, 1); // # src bytes already processed. Only lower 32 bits are valid! 4813 // Z_R1 contents must be treated as unsigned operand! For huge strings, 4814 // (Rcnt >= 2**30), the value may spill into the sign bit by sllg. 4815 z_aghi(result, min_cnt/2); // min_cnt/2 characters have already been written 4816 // but ptrs were not updated yet. 4817 z_slgfr(Rdst, Z_R0); // restore ptr 4818 z_slgfr(Rsrc, Z_R1); // restore ptr, double the element count for Rsrc restore 4819 z_bru(AllDone); 4820 } 4821 bind(UnrolledDone); 4822 } 4823 4824 { 4825 Label ScalarLoop, ScalarDone, ScalarBreak; 4826 4827 bind(ScalarShortcut); 4828 z_ltgfr(result, Rcnt); 4829 z_brz(AllDone); 4830 4831 #if 0 // Sacrifice shortcuts for code compactness 4832 { 4833 //---< Special treatment for very short strings (one or two characters) >--- 4834 // For these strings, we are sure that the above code was skipped. 4835 // Thus, no registers were modified, register restore is not required. 4836 Label ScalarDoit, Scalar2Char; 4837 z_chi(Rcnt, 2); 4838 z_brh(ScalarDoit); 4839 z_llh(Z_R1, 0, Z_R0, Rsrc); 4840 z_bre(Scalar2Char); 4841 z_tmll(Z_R1, 0xff00); 4842 z_lghi(result, 0); // cnt == 1, first char invalid, no chars successfully processed 4843 z_brnaz(AllDone); 4844 z_stc(Z_R1, 0, Z_R0, Rdst); 4845 z_lghi(result, 1); 4846 z_bru(AllDone); 4847 4848 bind(Scalar2Char); 4849 z_llh(Z_R0, 2, Z_R0, Rsrc); 4850 z_tmll(Z_R1, 0xff00); 4851 z_lghi(result, 0); // cnt == 2, first char invalid, no chars successfully processed 4852 z_brnaz(AllDone); 4853 z_stc(Z_R1, 0, Z_R0, Rdst); 4854 z_tmll(Z_R0, 0xff00); 4855 z_lghi(result, 1); // cnt == 2, second char invalid, one char successfully processed 4856 z_brnaz(AllDone); 4857 z_stc(Z_R0, 1, Z_R0, Rdst); 4858 z_lghi(result, 2); 4859 z_bru(AllDone); 4860 4861 bind(ScalarDoit); 4862 } 4863 #endif 4864 4865 if (VM_Version::has_DistinctOpnds()) { 4866 z_srk(Rix, Rcnt, Z_R0); // remaining # chars to compress in unrolled loop 4867 } else { 4868 z_lr(Rix, Rcnt); 4869 z_sr(Rix, Z_R0); 4870 } 4871 z_lgfr(result, Rcnt); // # processed characters (if all runs ok). 4872 z_brz(ScalarDone); // uses CC from Rix calculation 4873 4874 bind(ScalarLoop); 4875 z_llh(Z_R1, 0, Z_R0, Rsrc); 4876 z_tmll(Z_R1, 0xff00); 4877 z_brnaz(ScalarBreak); 4878 z_stc(Z_R1, 0, Z_R0, Rdst); 4879 add2reg(Rsrc, 2); 4880 add2reg(Rdst, 1); 4881 z_brct(Rix, ScalarLoop); 4882 4883 z_bru(ScalarDone); 4884 4885 bind(ScalarBreak); 4886 z_sr(result, Rix); 4887 4888 bind(ScalarDone); 4889 z_sgfr(Rdst, result); // restore ptr 4890 z_sgfr(Rsrc, result); // restore ptr, double the element count for Rsrc restore 4891 z_sgfr(Rsrc, result); 4892 } 4893 bind(AllDone); 4894 4895 if (precise) { 4896 BLOCK_COMMENT("} encode_iso_array"); 4897 } else { 4898 BLOCK_COMMENT("} string_compress"); 4899 } 4900 return offset() - block_start; 4901 } 4902 4903 // Inflate byte[] to char[]. 4904 unsigned int MacroAssembler::string_inflate_trot(Register src, Register dst, Register cnt, Register tmp) { 4905 int block_start = offset(); 4906 4907 BLOCK_COMMENT("string_inflate {"); 4908 4909 Register stop_char = Z_R0; 4910 Register table = Z_R1; 4911 Register src_addr = tmp; 4912 4913 assert_different_registers(Z_R0, Z_R1, tmp, src, dst, cnt); 4914 assert(dst->encoding()%2 == 0, "must be even reg"); 4915 assert(cnt->encoding()%2 == 1, "must be odd reg"); 4916 assert(cnt->encoding() - dst->encoding() == 1, "must be even/odd pair"); 4917 4918 StubRoutines::zarch::generate_load_trot_table_addr(this, table); // kills Z_R0 (if ASSERT) 4919 clear_reg(stop_char); // Stop character. Not used here, but initialized to have a defined value. 4920 lgr_if_needed(src_addr, src); 4921 z_llgfr(cnt, cnt); // # src characters, must be a positive simm32. 4922 4923 translate_ot(dst, src_addr, /* mask = */ 0x0001); 4924 4925 BLOCK_COMMENT("} string_inflate"); 4926 4927 return offset() - block_start; 4928 } 4929 4930 // Inflate byte[] to char[]. 4931 // Restores: src, dst 4932 // Uses: cnt 4933 // Kills: tmp, Z_R0, Z_R1. 4934 // Note: 4935 // cnt is signed int. Do not rely on high word! 4936 // counts # characters, not bytes. 4937 unsigned int MacroAssembler::string_inflate(Register src, Register dst, Register cnt, Register tmp) { 4938 assert_different_registers(Z_R0, Z_R1, src, dst, cnt, tmp); 4939 4940 BLOCK_COMMENT("string_inflate {"); 4941 int block_start = offset(); 4942 4943 Register Rcnt = cnt; // # characters (src: bytes, dst: char (2-byte)), remaining after current loop. 4944 Register Rix = tmp; // loop index 4945 Register Rsrc = src; // addr(src array) 4946 Register Rdst = dst; // addr(dst array) 4947 Label ScalarShortcut, AllDone; 4948 4949 #if 0 // Sacrifice shortcuts for code compactness 4950 { 4951 //---< shortcuts for short strings (very frequent) >--- 4952 Label skipShortcut, skip4Shortcut; 4953 z_ltr(Rcnt, Rcnt); // absolutely nothing to do for strings of len == 0. 4954 z_brz(AllDone); 4955 clear_reg(Z_R0); // make sure registers are properly initialized. 4956 clear_reg(Z_R1); 4957 z_chi(Rcnt, 4); 4958 z_brne(skip4Shortcut); // 4 characters are very frequent 4959 z_icm(Z_R0, 5, 0, Rsrc); // Treat exactly 4 characters specially. 4960 z_icm(Z_R1, 5, 2, Rsrc); 4961 z_stm(Z_R0, Z_R1, 0, Rdst); 4962 z_bru(AllDone); 4963 bind(skip4Shortcut); 4964 4965 z_chi(Rcnt, 8); 4966 z_brh(skipShortcut); // There's a lot to do... 4967 z_lgfr(Z_R0, Rcnt); // remaining #characters (<= 8). Precond for scalar loop. 4968 // This does not destroy the "register cleared" state of Z_R0. 4969 z_brl(ScalarShortcut); // Just a few characters 4970 z_icmh(Z_R0, 5, 0, Rsrc); // Treat exactly 8 characters specially. 4971 z_icmh(Z_R1, 5, 4, Rsrc); 4972 z_icm(Z_R0, 5, 2, Rsrc); 4973 z_icm(Z_R1, 5, 6, Rsrc); 4974 z_stmg(Z_R0, Z_R1, 0, Rdst); 4975 z_bru(AllDone); 4976 bind(skipShortcut); 4977 } 4978 #endif 4979 clear_reg(Z_R0); // make sure register is properly initialized. 4980 4981 if (VM_Version::has_VectorFacility()) { 4982 const int min_vcnt = 32; // Minimum #characters required to use vector instructions. 4983 // Otherwise just do nothing in vector mode. 4984 // Must be multiple of vector register length (16 bytes = 128 bits). 4985 const int log_min_vcnt = exact_log2(min_vcnt); 4986 Label VectorLoop, VectorDone; 4987 4988 assert(VM_Version::has_DistinctOpnds(), "Assumption when has_VectorFacility()"); 4989 z_srak(Rix, Rcnt, log_min_vcnt); // calculate # vector loop iterations 4990 z_brz(VectorDone); // skip if none 4991 4992 z_sllg(Z_R0, Rix, log_min_vcnt); // remember #chars that will be processed by vector loop 4993 4994 bind(VectorLoop); 4995 z_vlm(Z_V20, Z_V21, 0, Rsrc); // get next 32 characters (single-byte) 4996 add2reg(Rsrc, min_vcnt); 4997 4998 z_vuplhb(Z_V22, Z_V20); // V2 <- (expand) V0(high) 4999 z_vupllb(Z_V23, Z_V20); // V3 <- (expand) V0(low) 5000 z_vuplhb(Z_V24, Z_V21); // V4 <- (expand) V1(high) 5001 z_vupllb(Z_V25, Z_V21); // V5 <- (expand) V1(low) 5002 z_vstm(Z_V22, Z_V25, 0, Rdst); // store next 32 bytes 5003 add2reg(Rdst, min_vcnt*2); 5004 5005 z_brct(Rix, VectorLoop); 5006 5007 bind(VectorDone); 5008 } 5009 5010 const int min_cnt = 8; // Minimum #characters required to use unrolled scalar loop. 5011 // Otherwise just do nothing in unrolled scalar mode. 5012 // Must be multiple of 8. 5013 { 5014 const int log_min_cnt = exact_log2(min_cnt); 5015 Label UnrolledLoop, UnrolledDone; 5016 5017 5018 if (VM_Version::has_DistinctOpnds()) { 5019 z_srk(Rix, Rcnt, Z_R0); // remaining # chars to process in unrolled loop 5020 } else { 5021 z_lr(Rix, Rcnt); 5022 z_sr(Rix, Z_R0); 5023 } 5024 z_sra(Rix, log_min_cnt); // unrolled loop count 5025 z_brz(UnrolledDone); 5026 5027 clear_reg(Z_R0); 5028 clear_reg(Z_R1); 5029 5030 bind(UnrolledLoop); 5031 z_icmh(Z_R0, 5, 0, Rsrc); 5032 z_icmh(Z_R1, 5, 4, Rsrc); 5033 z_icm(Z_R0, 5, 2, Rsrc); 5034 z_icm(Z_R1, 5, 6, Rsrc); 5035 add2reg(Rsrc, min_cnt); 5036 5037 z_stmg(Z_R0, Z_R1, 0, Rdst); 5038 5039 add2reg(Rdst, min_cnt*2); 5040 z_brct(Rix, UnrolledLoop); 5041 5042 bind(UnrolledDone); 5043 z_lgfr(Z_R0, Rcnt); // # chars left over after unrolled loop. 5044 z_nilf(Z_R0, min_cnt-1); 5045 z_brnz(ScalarShortcut); // if zero, there is nothing left to do for scalar loop. 5046 // Rix == 0 in all cases. 5047 z_sgfr(Z_R0, Rcnt); // negative # characters the ptrs have been advanced previously. 5048 z_agr(Rdst, Z_R0); // restore ptr, double the element count for Rdst restore. 5049 z_agr(Rdst, Z_R0); 5050 z_agr(Rsrc, Z_R0); // restore ptr. 5051 z_bru(AllDone); 5052 } 5053 5054 { 5055 bind(ScalarShortcut); 5056 // Z_R0 must contain remaining # characters as 64-bit signed int here. 5057 // register contents is preserved over scalar processing (for register fixup). 5058 5059 #if 0 // Sacrifice shortcuts for code compactness 5060 { 5061 Label ScalarDefault; 5062 z_chi(Rcnt, 2); 5063 z_brh(ScalarDefault); 5064 z_llc(Z_R0, 0, Z_R0, Rsrc); // 6 bytes 5065 z_sth(Z_R0, 0, Z_R0, Rdst); // 4 bytes 5066 z_brl(AllDone); 5067 z_llc(Z_R0, 1, Z_R0, Rsrc); // 6 bytes 5068 z_sth(Z_R0, 2, Z_R0, Rdst); // 4 bytes 5069 z_bru(AllDone); 5070 bind(ScalarDefault); 5071 } 5072 #endif 5073 5074 Label CodeTable; 5075 // Some comments on Rix calculation: 5076 // - Rcnt is small, therefore no bits shifted out of low word (sll(g) instructions). 5077 // - high word of both Rix and Rcnt may contain garbage 5078 // - the final lngfr takes care of that garbage, extending the sign to high word 5079 z_sllg(Rix, Z_R0, 2); // calculate 10*Rix = (4*Rix + Rix)*2 5080 z_ar(Rix, Z_R0); 5081 z_larl(Z_R1, CodeTable); 5082 z_sll(Rix, 1); 5083 z_lngfr(Rix, Rix); // ix range: [0..7], after inversion & mult: [-(7*12)..(0*12)]. 5084 z_bc(Assembler::bcondAlways, 0, Rix, Z_R1); 5085 5086 z_llc(Z_R1, 6, Z_R0, Rsrc); // 6 bytes 5087 z_sth(Z_R1, 12, Z_R0, Rdst); // 4 bytes 5088 5089 z_llc(Z_R1, 5, Z_R0, Rsrc); 5090 z_sth(Z_R1, 10, Z_R0, Rdst); 5091 5092 z_llc(Z_R1, 4, Z_R0, Rsrc); 5093 z_sth(Z_R1, 8, Z_R0, Rdst); 5094 5095 z_llc(Z_R1, 3, Z_R0, Rsrc); 5096 z_sth(Z_R1, 6, Z_R0, Rdst); 5097 5098 z_llc(Z_R1, 2, Z_R0, Rsrc); 5099 z_sth(Z_R1, 4, Z_R0, Rdst); 5100 5101 z_llc(Z_R1, 1, Z_R0, Rsrc); 5102 z_sth(Z_R1, 2, Z_R0, Rdst); 5103 5104 z_llc(Z_R1, 0, Z_R0, Rsrc); 5105 z_sth(Z_R1, 0, Z_R0, Rdst); 5106 bind(CodeTable); 5107 5108 z_chi(Rcnt, 8); // no fixup for small strings. Rdst, Rsrc were not modified. 5109 z_brl(AllDone); 5110 5111 z_sgfr(Z_R0, Rcnt); // # characters the ptrs have been advanced previously. 5112 z_agr(Rdst, Z_R0); // restore ptr, double the element count for Rdst restore. 5113 z_agr(Rdst, Z_R0); 5114 z_agr(Rsrc, Z_R0); // restore ptr. 5115 } 5116 bind(AllDone); 5117 5118 BLOCK_COMMENT("} string_inflate"); 5119 return offset() - block_start; 5120 } 5121 5122 // Inflate byte[] to char[], length known at compile time. 5123 // Restores: src, dst 5124 // Kills: tmp, Z_R0, Z_R1. 5125 // Note: 5126 // len is signed int. Counts # characters, not bytes. 5127 unsigned int MacroAssembler::string_inflate_const(Register src, Register dst, Register tmp, int len) { 5128 assert_different_registers(Z_R0, Z_R1, src, dst, tmp); 5129 5130 BLOCK_COMMENT("string_inflate_const {"); 5131 int block_start = offset(); 5132 5133 Register Rix = tmp; // loop index 5134 Register Rsrc = src; // addr(src array) 5135 Register Rdst = dst; // addr(dst array) 5136 Label ScalarShortcut, AllDone; 5137 int nprocessed = 0; 5138 int src_off = 0; // compensate for saved (optimized away) ptr advancement. 5139 int dst_off = 0; // compensate for saved (optimized away) ptr advancement. 5140 bool restore_inputs = false; 5141 bool workreg_clear = false; 5142 5143 if ((len >= 32) && VM_Version::has_VectorFacility()) { 5144 const int min_vcnt = 32; // Minimum #characters required to use vector instructions. 5145 // Otherwise just do nothing in vector mode. 5146 // Must be multiple of vector register length (16 bytes = 128 bits). 5147 const int log_min_vcnt = exact_log2(min_vcnt); 5148 const int iterations = (len - nprocessed) >> log_min_vcnt; 5149 nprocessed += iterations << log_min_vcnt; 5150 Label VectorLoop; 5151 5152 if (iterations == 1) { 5153 z_vlm(Z_V20, Z_V21, 0+src_off, Rsrc); // get next 32 characters (single-byte) 5154 z_vuplhb(Z_V22, Z_V20); // V2 <- (expand) V0(high) 5155 z_vupllb(Z_V23, Z_V20); // V3 <- (expand) V0(low) 5156 z_vuplhb(Z_V24, Z_V21); // V4 <- (expand) V1(high) 5157 z_vupllb(Z_V25, Z_V21); // V5 <- (expand) V1(low) 5158 z_vstm(Z_V22, Z_V25, 0+dst_off, Rdst); // store next 32 bytes 5159 5160 src_off += min_vcnt; 5161 dst_off += min_vcnt*2; 5162 } else { 5163 restore_inputs = true; 5164 5165 z_lgfi(Rix, len>>log_min_vcnt); 5166 bind(VectorLoop); 5167 z_vlm(Z_V20, Z_V21, 0, Rsrc); // get next 32 characters (single-byte) 5168 add2reg(Rsrc, min_vcnt); 5169 5170 z_vuplhb(Z_V22, Z_V20); // V2 <- (expand) V0(high) 5171 z_vupllb(Z_V23, Z_V20); // V3 <- (expand) V0(low) 5172 z_vuplhb(Z_V24, Z_V21); // V4 <- (expand) V1(high) 5173 z_vupllb(Z_V25, Z_V21); // V5 <- (expand) V1(low) 5174 z_vstm(Z_V22, Z_V25, 0, Rdst); // store next 32 bytes 5175 add2reg(Rdst, min_vcnt*2); 5176 5177 z_brct(Rix, VectorLoop); 5178 } 5179 } 5180 5181 if (((len-nprocessed) >= 16) && VM_Version::has_VectorFacility()) { 5182 const int min_vcnt = 16; // Minimum #characters required to use vector instructions. 5183 // Otherwise just do nothing in vector mode. 5184 // Must be multiple of vector register length (16 bytes = 128 bits). 5185 const int log_min_vcnt = exact_log2(min_vcnt); 5186 const int iterations = (len - nprocessed) >> log_min_vcnt; 5187 nprocessed += iterations << log_min_vcnt; 5188 assert(iterations == 1, "must be!"); 5189 5190 z_vl(Z_V20, 0+src_off, Z_R0, Rsrc); // get next 16 characters (single-byte) 5191 z_vuplhb(Z_V22, Z_V20); // V2 <- (expand) V0(high) 5192 z_vupllb(Z_V23, Z_V20); // V3 <- (expand) V0(low) 5193 z_vstm(Z_V22, Z_V23, 0+dst_off, Rdst); // store next 32 bytes 5194 5195 src_off += min_vcnt; 5196 dst_off += min_vcnt*2; 5197 } 5198 5199 if ((len-nprocessed) > 8) { 5200 const int min_cnt = 8; // Minimum #characters required to use unrolled scalar loop. 5201 // Otherwise just do nothing in unrolled scalar mode. 5202 // Must be multiple of 8. 5203 const int log_min_cnt = exact_log2(min_cnt); 5204 const int iterations = (len - nprocessed) >> log_min_cnt; 5205 nprocessed += iterations << log_min_cnt; 5206 5207 //---< avoid loop overhead/ptr increment for small # iterations >--- 5208 if (iterations <= 2) { 5209 clear_reg(Z_R0); 5210 clear_reg(Z_R1); 5211 workreg_clear = true; 5212 5213 z_icmh(Z_R0, 5, 0+src_off, Rsrc); 5214 z_icmh(Z_R1, 5, 4+src_off, Rsrc); 5215 z_icm(Z_R0, 5, 2+src_off, Rsrc); 5216 z_icm(Z_R1, 5, 6+src_off, Rsrc); 5217 z_stmg(Z_R0, Z_R1, 0+dst_off, Rdst); 5218 5219 src_off += min_cnt; 5220 dst_off += min_cnt*2; 5221 } 5222 5223 if (iterations == 2) { 5224 z_icmh(Z_R0, 5, 0+src_off, Rsrc); 5225 z_icmh(Z_R1, 5, 4+src_off, Rsrc); 5226 z_icm(Z_R0, 5, 2+src_off, Rsrc); 5227 z_icm(Z_R1, 5, 6+src_off, Rsrc); 5228 z_stmg(Z_R0, Z_R1, 0+dst_off, Rdst); 5229 5230 src_off += min_cnt; 5231 dst_off += min_cnt*2; 5232 } 5233 5234 if (iterations > 2) { 5235 Label UnrolledLoop; 5236 restore_inputs = true; 5237 5238 clear_reg(Z_R0); 5239 clear_reg(Z_R1); 5240 workreg_clear = true; 5241 5242 z_lgfi(Rix, iterations); 5243 bind(UnrolledLoop); 5244 z_icmh(Z_R0, 5, 0, Rsrc); 5245 z_icmh(Z_R1, 5, 4, Rsrc); 5246 z_icm(Z_R0, 5, 2, Rsrc); 5247 z_icm(Z_R1, 5, 6, Rsrc); 5248 add2reg(Rsrc, min_cnt); 5249 5250 z_stmg(Z_R0, Z_R1, 0, Rdst); 5251 add2reg(Rdst, min_cnt*2); 5252 5253 z_brct(Rix, UnrolledLoop); 5254 } 5255 } 5256 5257 if ((len-nprocessed) > 0) { 5258 switch (len-nprocessed) { 5259 case 8: 5260 if (!workreg_clear) { 5261 clear_reg(Z_R0); 5262 clear_reg(Z_R1); 5263 } 5264 z_icmh(Z_R0, 5, 0+src_off, Rsrc); 5265 z_icmh(Z_R1, 5, 4+src_off, Rsrc); 5266 z_icm(Z_R0, 5, 2+src_off, Rsrc); 5267 z_icm(Z_R1, 5, 6+src_off, Rsrc); 5268 z_stmg(Z_R0, Z_R1, 0+dst_off, Rdst); 5269 break; 5270 case 7: 5271 if (!workreg_clear) { 5272 clear_reg(Z_R0); 5273 clear_reg(Z_R1); 5274 } 5275 clear_reg(Rix); 5276 z_icm(Z_R0, 5, 0+src_off, Rsrc); 5277 z_icm(Z_R1, 5, 2+src_off, Rsrc); 5278 z_icm(Rix, 5, 4+src_off, Rsrc); 5279 z_stm(Z_R0, Z_R1, 0+dst_off, Rdst); 5280 z_llc(Z_R0, 6+src_off, Z_R0, Rsrc); 5281 z_st(Rix, 8+dst_off, Z_R0, Rdst); 5282 z_sth(Z_R0, 12+dst_off, Z_R0, Rdst); 5283 break; 5284 case 6: 5285 if (!workreg_clear) { 5286 clear_reg(Z_R0); 5287 clear_reg(Z_R1); 5288 } 5289 clear_reg(Rix); 5290 z_icm(Z_R0, 5, 0+src_off, Rsrc); 5291 z_icm(Z_R1, 5, 2+src_off, Rsrc); 5292 z_icm(Rix, 5, 4+src_off, Rsrc); 5293 z_stm(Z_R0, Z_R1, 0+dst_off, Rdst); 5294 z_st(Rix, 8+dst_off, Z_R0, Rdst); 5295 break; 5296 case 5: 5297 if (!workreg_clear) { 5298 clear_reg(Z_R0); 5299 clear_reg(Z_R1); 5300 } 5301 z_icm(Z_R0, 5, 0+src_off, Rsrc); 5302 z_icm(Z_R1, 5, 2+src_off, Rsrc); 5303 z_llc(Rix, 4+src_off, Z_R0, Rsrc); 5304 z_stm(Z_R0, Z_R1, 0+dst_off, Rdst); 5305 z_sth(Rix, 8+dst_off, Z_R0, Rdst); 5306 break; 5307 case 4: 5308 if (!workreg_clear) { 5309 clear_reg(Z_R0); 5310 clear_reg(Z_R1); 5311 } 5312 z_icm(Z_R0, 5, 0+src_off, Rsrc); 5313 z_icm(Z_R1, 5, 2+src_off, Rsrc); 5314 z_stm(Z_R0, Z_R1, 0+dst_off, Rdst); 5315 break; 5316 case 3: 5317 if (!workreg_clear) { 5318 clear_reg(Z_R0); 5319 } 5320 z_llc(Z_R1, 2+src_off, Z_R0, Rsrc); 5321 z_icm(Z_R0, 5, 0+src_off, Rsrc); 5322 z_sth(Z_R1, 4+dst_off, Z_R0, Rdst); 5323 z_st(Z_R0, 0+dst_off, Rdst); 5324 break; 5325 case 2: 5326 z_llc(Z_R0, 0+src_off, Z_R0, Rsrc); 5327 z_llc(Z_R1, 1+src_off, Z_R0, Rsrc); 5328 z_sth(Z_R0, 0+dst_off, Z_R0, Rdst); 5329 z_sth(Z_R1, 2+dst_off, Z_R0, Rdst); 5330 break; 5331 case 1: 5332 z_llc(Z_R0, 0+src_off, Z_R0, Rsrc); 5333 z_sth(Z_R0, 0+dst_off, Z_R0, Rdst); 5334 break; 5335 default: 5336 guarantee(false, "Impossible"); 5337 break; 5338 } 5339 src_off += len-nprocessed; 5340 dst_off += (len-nprocessed)*2; 5341 nprocessed = len; 5342 } 5343 5344 //---< restore modified input registers >--- 5345 if ((nprocessed > 0) && restore_inputs) { 5346 z_agfi(Rsrc, -(nprocessed-src_off)); 5347 if (nprocessed < 1000000000) { // avoid int overflow 5348 z_agfi(Rdst, -(nprocessed*2-dst_off)); 5349 } else { 5350 z_agfi(Rdst, -(nprocessed-dst_off)); 5351 z_agfi(Rdst, -nprocessed); 5352 } 5353 } 5354 5355 BLOCK_COMMENT("} string_inflate_const"); 5356 return offset() - block_start; 5357 } 5358 5359 // Kills src. 5360 unsigned int MacroAssembler::has_negatives(Register result, Register src, Register cnt, 5361 Register odd_reg, Register even_reg, Register tmp) { 5362 int block_start = offset(); 5363 Label Lloop1, Lloop2, Lslow, Lnotfound, Ldone; 5364 const Register addr = src, mask = tmp; 5365 5366 BLOCK_COMMENT("has_negatives {"); 5367 5368 z_llgfr(Z_R1, cnt); // Number of bytes to read. (Must be a positive simm32.) 5369 z_llilf(mask, 0x80808080); 5370 z_lhi(result, 1); // Assume true. 5371 // Last possible addr for fast loop. 5372 z_lay(odd_reg, -16, Z_R1, src); 5373 z_chi(cnt, 16); 5374 z_brl(Lslow); 5375 5376 // ind1: index, even_reg: index increment, odd_reg: index limit 5377 z_iihf(mask, 0x80808080); 5378 z_lghi(even_reg, 16); 5379 5380 bind(Lloop1); // 16 bytes per iteration. 5381 z_lg(Z_R0, Address(addr)); 5382 z_lg(Z_R1, Address(addr, 8)); 5383 z_ogr(Z_R0, Z_R1); 5384 z_ngr(Z_R0, mask); 5385 z_brne(Ldone); // If found return 1. 5386 z_brxlg(addr, even_reg, Lloop1); 5387 5388 bind(Lslow); 5389 z_aghi(odd_reg, 16-1); // Last possible addr for slow loop. 5390 z_lghi(even_reg, 1); 5391 z_cgr(addr, odd_reg); 5392 z_brh(Lnotfound); 5393 5394 bind(Lloop2); // 1 byte per iteration. 5395 z_cli(Address(addr), 0x80); 5396 z_brnl(Ldone); // If found return 1. 5397 z_brxlg(addr, even_reg, Lloop2); 5398 5399 bind(Lnotfound); 5400 z_lhi(result, 0); 5401 5402 bind(Ldone); 5403 5404 BLOCK_COMMENT("} has_negatives"); 5405 5406 return offset() - block_start; 5407 } 5408 5409 #ifdef COMPILER2 5410 // kill: cnt1, cnt2, odd_reg, even_reg; early clobber: result 5411 unsigned int MacroAssembler::string_compare(Register str1, Register str2, 5412 Register cnt1, Register cnt2, 5413 Register odd_reg, Register even_reg, Register result, int ae) { 5414 int block_start = offset(); 5415 5416 assert_different_registers(str1, cnt1, cnt2, odd_reg, even_reg, result); 5417 assert_different_registers(str2, cnt1, cnt2, odd_reg, even_reg, result); 5418 5419 // If strings are equal up to min length, return the length difference. 5420 const Register diff = result, // Pre-set result with length difference. 5421 min = cnt1, // min number of bytes 5422 tmp = cnt2; 5423 5424 // Note: Making use of the fact that compareTo(a, b) == -compareTo(b, a) 5425 // we interchange str1 and str2 in the UL case and negate the result. 5426 // Like this, str1 is always latin1 encoded, except for the UU case. 5427 // In addition, we need 0 (or sign which is 0) extend when using 64 bit register. 5428 const bool used_as_LU = (ae == StrIntrinsicNode::LU || ae == StrIntrinsicNode::UL); 5429 5430 BLOCK_COMMENT("string_compare {"); 5431 5432 if (used_as_LU) { 5433 z_srl(cnt2, 1); 5434 } 5435 5436 // See if the lengths are different, and calculate min in cnt1. 5437 // Save diff in case we need it for a tie-breaker. 5438 5439 // diff = cnt1 - cnt2 5440 if (VM_Version::has_DistinctOpnds()) { 5441 z_srk(diff, cnt1, cnt2); 5442 } else { 5443 z_lr(diff, cnt1); 5444 z_sr(diff, cnt2); 5445 } 5446 if (str1 != str2) { 5447 if (VM_Version::has_LoadStoreConditional()) { 5448 z_locr(min, cnt2, Assembler::bcondHigh); 5449 } else { 5450 Label Lskip; 5451 z_brl(Lskip); // min ok if cnt1 < cnt2 5452 z_lr(min, cnt2); // min = cnt2 5453 bind(Lskip); 5454 } 5455 } 5456 5457 if (ae == StrIntrinsicNode::UU) { 5458 z_sra(diff, 1); 5459 } 5460 if (str1 != str2) { 5461 Label Ldone; 5462 if (used_as_LU) { 5463 // Loop which searches the first difference character by character. 5464 Label Lloop; 5465 const Register ind1 = Z_R1, 5466 ind2 = min; 5467 int stride1 = 1, stride2 = 2; // See comment above. 5468 5469 // ind1: index, even_reg: index increment, odd_reg: index limit 5470 z_llilf(ind1, (unsigned int)(-stride1)); 5471 z_lhi(even_reg, stride1); 5472 add2reg(odd_reg, -stride1, min); 5473 clear_reg(ind2); // kills min 5474 5475 bind(Lloop); 5476 z_brxh(ind1, even_reg, Ldone); 5477 z_llc(tmp, Address(str1, ind1)); 5478 z_llh(Z_R0, Address(str2, ind2)); 5479 z_ahi(ind2, stride2); 5480 z_sr(tmp, Z_R0); 5481 z_bre(Lloop); 5482 5483 z_lr(result, tmp); 5484 5485 } else { 5486 // Use clcle in fast loop (only for same encoding). 5487 z_lgr(Z_R0, str1); 5488 z_lgr(even_reg, str2); 5489 z_llgfr(Z_R1, min); 5490 z_llgfr(odd_reg, min); 5491 5492 if (ae == StrIntrinsicNode::LL) { 5493 compare_long_ext(Z_R0, even_reg, 0); 5494 } else { 5495 compare_long_uni(Z_R0, even_reg, 0); 5496 } 5497 z_bre(Ldone); 5498 z_lgr(Z_R1, Z_R0); 5499 if (ae == StrIntrinsicNode::LL) { 5500 z_llc(Z_R0, Address(even_reg)); 5501 z_llc(result, Address(Z_R1)); 5502 } else { 5503 z_llh(Z_R0, Address(even_reg)); 5504 z_llh(result, Address(Z_R1)); 5505 } 5506 z_sr(result, Z_R0); 5507 } 5508 5509 // Otherwise, return the difference between the first mismatched chars. 5510 bind(Ldone); 5511 } 5512 5513 if (ae == StrIntrinsicNode::UL) { 5514 z_lcr(result, result); // Negate result (see note above). 5515 } 5516 5517 BLOCK_COMMENT("} string_compare"); 5518 5519 return offset() - block_start; 5520 } 5521 #endif 5522 5523 unsigned int MacroAssembler::array_equals(bool is_array_equ, Register ary1, Register ary2, Register limit, 5524 Register odd_reg, Register even_reg, Register result, bool is_byte) { 5525 int block_start = offset(); 5526 5527 BLOCK_COMMENT("array_equals {"); 5528 5529 assert_different_registers(ary1, limit, odd_reg, even_reg); 5530 assert_different_registers(ary2, limit, odd_reg, even_reg); 5531 5532 Label Ldone, Ldone_true, Ldone_false, Lclcle, CLC_template; 5533 int base_offset = 0; 5534 5535 if (ary1 != ary2) { 5536 if (is_array_equ) { 5537 base_offset = arrayOopDesc::base_offset_in_bytes(is_byte ? T_BYTE : T_CHAR); 5538 5539 // Return true if the same array. 5540 compareU64_and_branch(ary1, ary2, Assembler::bcondEqual, Ldone_true); 5541 5542 // Return false if one of them is NULL. 5543 compareU64_and_branch(ary1, (intptr_t)0, Assembler::bcondEqual, Ldone_false); 5544 compareU64_and_branch(ary2, (intptr_t)0, Assembler::bcondEqual, Ldone_false); 5545 5546 // Load the lengths of arrays. 5547 z_llgf(odd_reg, Address(ary1, arrayOopDesc::length_offset_in_bytes())); 5548 5549 // Return false if the two arrays are not equal length. 5550 z_c(odd_reg, Address(ary2, arrayOopDesc::length_offset_in_bytes())); 5551 z_brne(Ldone_false); 5552 5553 // string len in bytes (right operand) 5554 if (!is_byte) { 5555 z_chi(odd_reg, 128); 5556 z_sll(odd_reg, 1); // preserves flags 5557 z_brh(Lclcle); 5558 } else { 5559 compareU32_and_branch(odd_reg, (intptr_t)256, Assembler::bcondHigh, Lclcle); 5560 } 5561 } else { 5562 z_llgfr(odd_reg, limit); // Need to zero-extend prior to using the value. 5563 compareU32_and_branch(limit, (intptr_t)256, Assembler::bcondHigh, Lclcle); 5564 } 5565 5566 5567 // Use clc instruction for up to 256 bytes. 5568 { 5569 Register str1_reg = ary1, 5570 str2_reg = ary2; 5571 if (is_array_equ) { 5572 str1_reg = Z_R1; 5573 str2_reg = even_reg; 5574 add2reg(str1_reg, base_offset, ary1); // string addr (left operand) 5575 add2reg(str2_reg, base_offset, ary2); // string addr (right operand) 5576 } 5577 z_ahi(odd_reg, -1); // Clc uses decremented limit. Also compare result to 0. 5578 z_brl(Ldone_true); 5579 // Note: We could jump to the template if equal. 5580 5581 assert(VM_Version::has_ExecuteExtensions(), "unsupported hardware"); 5582 z_exrl(odd_reg, CLC_template); 5583 z_bre(Ldone_true); 5584 // fall through 5585 5586 bind(Ldone_false); 5587 clear_reg(result); 5588 z_bru(Ldone); 5589 5590 bind(CLC_template); 5591 z_clc(0, 0, str1_reg, 0, str2_reg); 5592 } 5593 5594 // Use clcle instruction. 5595 { 5596 bind(Lclcle); 5597 add2reg(even_reg, base_offset, ary2); // string addr (right operand) 5598 add2reg(Z_R0, base_offset, ary1); // string addr (left operand) 5599 5600 z_lgr(Z_R1, odd_reg); // string len in bytes (left operand) 5601 if (is_byte) { 5602 compare_long_ext(Z_R0, even_reg, 0); 5603 } else { 5604 compare_long_uni(Z_R0, even_reg, 0); 5605 } 5606 z_lghi(result, 0); // Preserve flags. 5607 z_brne(Ldone); 5608 } 5609 } 5610 // fall through 5611 5612 bind(Ldone_true); 5613 z_lghi(result, 1); // All characters are equal. 5614 bind(Ldone); 5615 5616 BLOCK_COMMENT("} array_equals"); 5617 5618 return offset() - block_start; 5619 } 5620 5621 #ifdef COMPILER2 5622 // kill: haycnt, needlecnt, odd_reg, even_reg; early clobber: result 5623 unsigned int MacroAssembler::string_indexof(Register result, Register haystack, Register haycnt, 5624 Register needle, Register needlecnt, int needlecntval, 5625 Register odd_reg, Register even_reg, int ae) { 5626 int block_start = offset(); 5627 5628 // Ensure 0<needlecnt<=haycnt in ideal graph as prerequisite! 5629 assert(ae != StrIntrinsicNode::LU, "Invalid encoding"); 5630 const int h_csize = (ae == StrIntrinsicNode::LL) ? 1 : 2; 5631 const int n_csize = (ae == StrIntrinsicNode::UU) ? 2 : 1; 5632 Label L_needle1, L_Found, L_NotFound; 5633 5634 BLOCK_COMMENT("string_indexof {"); 5635 5636 if (needle == haystack) { 5637 z_lhi(result, 0); 5638 } else { 5639 5640 // Load first character of needle (R0 used by search_string instructions). 5641 if (n_csize == 2) { z_llgh(Z_R0, Address(needle)); } else { z_llgc(Z_R0, Address(needle)); } 5642 5643 // Compute last haystack addr to use if no match gets found. 5644 if (needlecnt != noreg) { // variable needlecnt 5645 z_ahi(needlecnt, -1); // Remaining characters after first one. 5646 z_sr(haycnt, needlecnt); // Compute index succeeding last element to compare. 5647 if (n_csize == 2) { z_sll(needlecnt, 1); } // In bytes. 5648 } else { // constant needlecnt 5649 assert((needlecntval & 0x7fff) == needlecntval, "must be positive simm16 immediate"); 5650 // Compute index succeeding last element to compare. 5651 if (needlecntval != 1) { z_ahi(haycnt, 1 - needlecntval); } 5652 } 5653 5654 z_llgfr(haycnt, haycnt); // Clear high half. 5655 z_lgr(result, haystack); // Final result will be computed from needle start pointer. 5656 if (h_csize == 2) { z_sll(haycnt, 1); } // Scale to number of bytes. 5657 z_agr(haycnt, haystack); // Point to address succeeding last element (haystack+scale*(haycnt-needlecnt+1)). 5658 5659 if (h_csize != n_csize) { 5660 assert(ae == StrIntrinsicNode::UL, "Invalid encoding"); 5661 5662 if (needlecnt != noreg || needlecntval != 1) { 5663 if (needlecnt != noreg) { 5664 compare32_and_branch(needlecnt, (intptr_t)0, Assembler::bcondEqual, L_needle1); 5665 } 5666 5667 // Main Loop: UL version (now we have at least 2 characters). 5668 Label L_OuterLoop, L_InnerLoop, L_Skip; 5669 bind(L_OuterLoop); // Search for 1st 2 characters. 5670 z_lgr(Z_R1, haycnt); 5671 MacroAssembler::search_string_uni(Z_R1, result); 5672 z_brc(Assembler::bcondNotFound, L_NotFound); 5673 z_lgr(result, Z_R1); 5674 5675 z_lghi(Z_R1, n_csize); 5676 z_lghi(even_reg, h_csize); 5677 bind(L_InnerLoop); 5678 z_llgc(odd_reg, Address(needle, Z_R1)); 5679 z_ch(odd_reg, Address(result, even_reg)); 5680 z_brne(L_Skip); 5681 if (needlecnt != noreg) { z_cr(Z_R1, needlecnt); } else { z_chi(Z_R1, needlecntval - 1); } 5682 z_brnl(L_Found); 5683 z_aghi(Z_R1, n_csize); 5684 z_aghi(even_reg, h_csize); 5685 z_bru(L_InnerLoop); 5686 5687 bind(L_Skip); 5688 z_aghi(result, h_csize); // This is the new address we want to use for comparing. 5689 z_bru(L_OuterLoop); 5690 } 5691 5692 } else { 5693 const intptr_t needle_bytes = (n_csize == 2) ? ((needlecntval - 1) << 1) : (needlecntval - 1); 5694 Label L_clcle; 5695 5696 if (needlecnt != noreg || (needlecntval != 1 && needle_bytes <= 256)) { 5697 if (needlecnt != noreg) { 5698 compare32_and_branch(needlecnt, 256, Assembler::bcondHigh, L_clcle); 5699 z_ahi(needlecnt, -1); // remaining bytes -1 (for CLC) 5700 z_brl(L_needle1); 5701 } 5702 5703 // Main Loop: clc version (now we have at least 2 characters). 5704 Label L_OuterLoop, CLC_template; 5705 bind(L_OuterLoop); // Search for 1st 2 characters. 5706 z_lgr(Z_R1, haycnt); 5707 if (h_csize == 1) { 5708 MacroAssembler::search_string(Z_R1, result); 5709 } else { 5710 MacroAssembler::search_string_uni(Z_R1, result); 5711 } 5712 z_brc(Assembler::bcondNotFound, L_NotFound); 5713 z_lgr(result, Z_R1); 5714 5715 if (needlecnt != noreg) { 5716 assert(VM_Version::has_ExecuteExtensions(), "unsupported hardware"); 5717 z_exrl(needlecnt, CLC_template); 5718 } else { 5719 z_clc(h_csize, needle_bytes -1, Z_R1, n_csize, needle); 5720 } 5721 z_bre(L_Found); 5722 z_aghi(result, h_csize); // This is the new address we want to use for comparing. 5723 z_bru(L_OuterLoop); 5724 5725 if (needlecnt != noreg) { 5726 bind(CLC_template); 5727 z_clc(h_csize, 0, Z_R1, n_csize, needle); 5728 } 5729 } 5730 5731 if (needlecnt != noreg || needle_bytes > 256) { 5732 bind(L_clcle); 5733 5734 // Main Loop: clcle version (now we have at least 256 bytes). 5735 Label L_OuterLoop, CLC_template; 5736 bind(L_OuterLoop); // Search for 1st 2 characters. 5737 z_lgr(Z_R1, haycnt); 5738 if (h_csize == 1) { 5739 MacroAssembler::search_string(Z_R1, result); 5740 } else { 5741 MacroAssembler::search_string_uni(Z_R1, result); 5742 } 5743 z_brc(Assembler::bcondNotFound, L_NotFound); 5744 5745 add2reg(Z_R0, n_csize, needle); 5746 add2reg(even_reg, h_csize, Z_R1); 5747 z_lgr(result, Z_R1); 5748 if (needlecnt != noreg) { 5749 z_llgfr(Z_R1, needlecnt); // needle len in bytes (left operand) 5750 z_llgfr(odd_reg, needlecnt); 5751 } else { 5752 load_const_optimized(Z_R1, needle_bytes); 5753 if (Immediate::is_simm16(needle_bytes)) { z_lghi(odd_reg, needle_bytes); } else { z_lgr(odd_reg, Z_R1); } 5754 } 5755 if (h_csize == 1) { 5756 compare_long_ext(Z_R0, even_reg, 0); 5757 } else { 5758 compare_long_uni(Z_R0, even_reg, 0); 5759 } 5760 z_bre(L_Found); 5761 5762 if (n_csize == 2) { z_llgh(Z_R0, Address(needle)); } else { z_llgc(Z_R0, Address(needle)); } // Reload. 5763 z_aghi(result, h_csize); // This is the new address we want to use for comparing. 5764 z_bru(L_OuterLoop); 5765 } 5766 } 5767 5768 if (needlecnt != noreg || needlecntval == 1) { 5769 bind(L_needle1); 5770 5771 // Single needle character version. 5772 if (h_csize == 1) { 5773 MacroAssembler::search_string(haycnt, result); 5774 } else { 5775 MacroAssembler::search_string_uni(haycnt, result); 5776 } 5777 z_lgr(result, haycnt); 5778 z_brc(Assembler::bcondFound, L_Found); 5779 } 5780 5781 bind(L_NotFound); 5782 add2reg(result, -1, haystack); // Return -1. 5783 5784 bind(L_Found); // Return index (or -1 in fallthrough case). 5785 z_sgr(result, haystack); 5786 if (h_csize == 2) { z_srag(result, result, exact_log2(sizeof(jchar))); } 5787 } 5788 BLOCK_COMMENT("} string_indexof"); 5789 5790 return offset() - block_start; 5791 } 5792 5793 // early clobber: result 5794 unsigned int MacroAssembler::string_indexof_char(Register result, Register haystack, Register haycnt, 5795 Register needle, jchar needleChar, Register odd_reg, Register even_reg, bool is_byte) { 5796 int block_start = offset(); 5797 5798 BLOCK_COMMENT("string_indexof_char {"); 5799 5800 if (needle == haystack) { 5801 z_lhi(result, 0); 5802 } else { 5803 5804 Label Ldone; 5805 5806 z_llgfr(odd_reg, haycnt); // Preset loop ctr/searchrange end. 5807 if (needle == noreg) { 5808 load_const_optimized(Z_R0, (unsigned long)needleChar); 5809 } else { 5810 if (is_byte) { 5811 z_llgcr(Z_R0, needle); // First (and only) needle char. 5812 } else { 5813 z_llghr(Z_R0, needle); // First (and only) needle char. 5814 } 5815 } 5816 5817 if (!is_byte) { 5818 z_agr(odd_reg, odd_reg); // Calc #bytes to be processed with SRSTU. 5819 } 5820 5821 z_lgr(even_reg, haystack); // haystack addr 5822 z_agr(odd_reg, haystack); // First char after range end. 5823 z_lghi(result, -1); 5824 5825 if (is_byte) { 5826 MacroAssembler::search_string(odd_reg, even_reg); 5827 } else { 5828 MacroAssembler::search_string_uni(odd_reg, even_reg); 5829 } 5830 z_brc(Assembler::bcondNotFound, Ldone); 5831 if (is_byte) { 5832 if (VM_Version::has_DistinctOpnds()) { 5833 z_sgrk(result, odd_reg, haystack); 5834 } else { 5835 z_sgr(odd_reg, haystack); 5836 z_lgr(result, odd_reg); 5837 } 5838 } else { 5839 z_slgr(odd_reg, haystack); 5840 z_srlg(result, odd_reg, exact_log2(sizeof(jchar))); 5841 } 5842 5843 bind(Ldone); 5844 } 5845 BLOCK_COMMENT("} string_indexof_char"); 5846 5847 return offset() - block_start; 5848 } 5849 #endif 5850 5851 //------------------------------------------------- 5852 // Constants (scalar and oop) in constant pool 5853 //------------------------------------------------- 5854 5855 // Add a non-relocated constant to the CP. 5856 int MacroAssembler::store_const_in_toc(AddressLiteral& val) { 5857 long value = val.value(); 5858 address tocPos = long_constant(value); 5859 5860 if (tocPos != NULL) { 5861 int tocOffset = (int)(tocPos - code()->consts()->start()); 5862 return tocOffset; 5863 } 5864 // Address_constant returned NULL, so no constant entry has been created. 5865 // In that case, we return a "fatal" offset, just in case that subsequently 5866 // generated access code is executed. 5867 return -1; 5868 } 5869 5870 // Returns the TOC offset where the address is stored. 5871 // Add a relocated constant to the CP. 5872 int MacroAssembler::store_oop_in_toc(AddressLiteral& oop) { 5873 // Use RelocationHolder::none for the constant pool entry. 5874 // Otherwise we will end up with a failing NativeCall::verify(x), 5875 // where x is the address of the constant pool entry. 5876 address tocPos = address_constant((address)oop.value(), RelocationHolder::none); 5877 5878 if (tocPos != NULL) { 5879 int tocOffset = (int)(tocPos - code()->consts()->start()); 5880 RelocationHolder rsp = oop.rspec(); 5881 Relocation *rel = rsp.reloc(); 5882 5883 // Store toc_offset in relocation, used by call_far_patchable. 5884 if ((relocInfo::relocType)rel->type() == relocInfo::runtime_call_w_cp_type) { 5885 ((runtime_call_w_cp_Relocation *)(rel))->set_constant_pool_offset(tocOffset); 5886 } 5887 // Relocate at the load's pc. 5888 relocate(rsp); 5889 5890 return tocOffset; 5891 } 5892 // Address_constant returned NULL, so no constant entry has been created 5893 // in that case, we return a "fatal" offset, just in case that subsequently 5894 // generated access code is executed. 5895 return -1; 5896 } 5897 5898 bool MacroAssembler::load_const_from_toc(Register dst, AddressLiteral& a, Register Rtoc) { 5899 int tocOffset = store_const_in_toc(a); 5900 if (tocOffset == -1) return false; 5901 address tocPos = tocOffset + code()->consts()->start(); 5902 assert((address)code()->consts()->start() != NULL, "Please add CP address"); 5903 relocate(a.rspec()); 5904 load_long_pcrelative(dst, tocPos); 5905 return true; 5906 } 5907 5908 bool MacroAssembler::load_oop_from_toc(Register dst, AddressLiteral& a, Register Rtoc) { 5909 int tocOffset = store_oop_in_toc(a); 5910 if (tocOffset == -1) return false; 5911 address tocPos = tocOffset + code()->consts()->start(); 5912 assert((address)code()->consts()->start() != NULL, "Please add CP address"); 5913 5914 load_addr_pcrelative(dst, tocPos); 5915 return true; 5916 } 5917 5918 // If the instruction sequence at the given pc is a load_const_from_toc 5919 // sequence, return the value currently stored at the referenced position 5920 // in the TOC. 5921 intptr_t MacroAssembler::get_const_from_toc(address pc) { 5922 5923 assert(is_load_const_from_toc(pc), "must be load_const_from_pool"); 5924 5925 long offset = get_load_const_from_toc_offset(pc); 5926 address dataLoc = NULL; 5927 if (is_load_const_from_toc_pcrelative(pc)) { 5928 dataLoc = pc + offset; 5929 } else { 5930 CodeBlob* cb = CodeCache::find_blob_unsafe(pc); // Else we get assertion if nmethod is zombie. 5931 assert(cb && cb->is_nmethod(), "sanity"); 5932 nmethod* nm = (nmethod*)cb; 5933 dataLoc = nm->ctable_begin() + offset; 5934 } 5935 return *(intptr_t *)dataLoc; 5936 } 5937 5938 // If the instruction sequence at the given pc is a load_const_from_toc 5939 // sequence, copy the passed-in new_data value into the referenced 5940 // position in the TOC. 5941 void MacroAssembler::set_const_in_toc(address pc, unsigned long new_data, CodeBlob *cb) { 5942 assert(is_load_const_from_toc(pc), "must be load_const_from_pool"); 5943 5944 long offset = MacroAssembler::get_load_const_from_toc_offset(pc); 5945 address dataLoc = NULL; 5946 if (is_load_const_from_toc_pcrelative(pc)) { 5947 dataLoc = pc+offset; 5948 } else { 5949 nmethod* nm = CodeCache::find_nmethod(pc); 5950 assert((cb == NULL) || (nm == (nmethod*)cb), "instruction address should be in CodeBlob"); 5951 dataLoc = nm->ctable_begin() + offset; 5952 } 5953 if (*(unsigned long *)dataLoc != new_data) { // Prevent cache invalidation: update only if necessary. 5954 *(unsigned long *)dataLoc = new_data; 5955 } 5956 } 5957 5958 // Dynamic TOC. Getter must only be called if "a" is a load_const_from_toc 5959 // site. Verify by calling is_load_const_from_toc() before!! 5960 // Offset is +/- 2**32 -> use long. 5961 long MacroAssembler::get_load_const_from_toc_offset(address a) { 5962 assert(is_load_const_from_toc_pcrelative(a), "expected pc relative load"); 5963 // expected code sequence: 5964 // z_lgrl(t, simm32); len = 6 5965 unsigned long inst; 5966 unsigned int len = get_instruction(a, &inst); 5967 return get_pcrel_offset(inst); 5968 } 5969 5970 //********************************************************************************** 5971 // inspection of generated instruction sequences for a particular pattern 5972 //********************************************************************************** 5973 5974 bool MacroAssembler::is_load_const_from_toc_pcrelative(address a) { 5975 #ifdef ASSERT 5976 unsigned long inst; 5977 unsigned int len = get_instruction(a+2, &inst); 5978 if ((len == 6) && is_load_pcrelative_long(a) && is_call_pcrelative_long(inst)) { 5979 const int range = 128; 5980 Assembler::dump_code_range(tty, a, range, "instr(a) == z_lgrl && instr(a+2) == z_brasl"); 5981 VM_Version::z_SIGSEGV(); 5982 } 5983 #endif 5984 // expected code sequence: 5985 // z_lgrl(t, relAddr32); len = 6 5986 //TODO: verify accessed data is in CP, if possible. 5987 return is_load_pcrelative_long(a); // TODO: might be too general. Currently, only lgrl is used. 5988 } 5989 5990 bool MacroAssembler::is_load_const_from_toc_call(address a) { 5991 return is_load_const_from_toc(a) && is_call_byregister(a + load_const_from_toc_size()); 5992 } 5993 5994 bool MacroAssembler::is_load_const_call(address a) { 5995 return is_load_const(a) && is_call_byregister(a + load_const_size()); 5996 } 5997 5998 //------------------------------------------------- 5999 // Emitters for some really CICS instructions 6000 //------------------------------------------------- 6001 6002 void MacroAssembler::move_long_ext(Register dst, Register src, unsigned int pad) { 6003 assert(dst->encoding()%2==0, "must be an even/odd register pair"); 6004 assert(src->encoding()%2==0, "must be an even/odd register pair"); 6005 assert(pad<256, "must be a padding BYTE"); 6006 6007 Label retry; 6008 bind(retry); 6009 Assembler::z_mvcle(dst, src, pad); 6010 Assembler::z_brc(Assembler::bcondOverflow /* CC==3 (iterate) */, retry); 6011 } 6012 6013 void MacroAssembler::compare_long_ext(Register left, Register right, unsigned int pad) { 6014 assert(left->encoding() % 2 == 0, "must be an even/odd register pair"); 6015 assert(right->encoding() % 2 == 0, "must be an even/odd register pair"); 6016 assert(pad<256, "must be a padding BYTE"); 6017 6018 Label retry; 6019 bind(retry); 6020 Assembler::z_clcle(left, right, pad, Z_R0); 6021 Assembler::z_brc(Assembler::bcondOverflow /* CC==3 (iterate) */, retry); 6022 } 6023 6024 void MacroAssembler::compare_long_uni(Register left, Register right, unsigned int pad) { 6025 assert(left->encoding() % 2 == 0, "must be an even/odd register pair"); 6026 assert(right->encoding() % 2 == 0, "must be an even/odd register pair"); 6027 assert(pad<=0xfff, "must be a padding HALFWORD"); 6028 assert(VM_Version::has_ETF2(), "instruction must be available"); 6029 6030 Label retry; 6031 bind(retry); 6032 Assembler::z_clclu(left, right, pad, Z_R0); 6033 Assembler::z_brc(Assembler::bcondOverflow /* CC==3 (iterate) */, retry); 6034 } 6035 6036 void MacroAssembler::search_string(Register end, Register start) { 6037 assert(end->encoding() != 0, "end address must not be in R0"); 6038 assert(start->encoding() != 0, "start address must not be in R0"); 6039 6040 Label retry; 6041 bind(retry); 6042 Assembler::z_srst(end, start); 6043 Assembler::z_brc(Assembler::bcondOverflow /* CC==3 (iterate) */, retry); 6044 } 6045 6046 void MacroAssembler::search_string_uni(Register end, Register start) { 6047 assert(end->encoding() != 0, "end address must not be in R0"); 6048 assert(start->encoding() != 0, "start address must not be in R0"); 6049 assert(VM_Version::has_ETF3(), "instruction must be available"); 6050 6051 Label retry; 6052 bind(retry); 6053 Assembler::z_srstu(end, start); 6054 Assembler::z_brc(Assembler::bcondOverflow /* CC==3 (iterate) */, retry); 6055 } 6056 6057 void MacroAssembler::kmac(Register srcBuff) { 6058 assert(srcBuff->encoding() != 0, "src buffer address can't be in Z_R0"); 6059 assert(srcBuff->encoding() % 2 == 0, "src buffer/len must be an even/odd register pair"); 6060 6061 Label retry; 6062 bind(retry); 6063 Assembler::z_kmac(Z_R0, srcBuff); 6064 Assembler::z_brc(Assembler::bcondOverflow /* CC==3 (iterate) */, retry); 6065 } 6066 6067 void MacroAssembler::kimd(Register srcBuff) { 6068 assert(srcBuff->encoding() != 0, "src buffer address can't be in Z_R0"); 6069 assert(srcBuff->encoding() % 2 == 0, "src buffer/len must be an even/odd register pair"); 6070 6071 Label retry; 6072 bind(retry); 6073 Assembler::z_kimd(Z_R0, srcBuff); 6074 Assembler::z_brc(Assembler::bcondOverflow /* CC==3 (iterate) */, retry); 6075 } 6076 6077 void MacroAssembler::klmd(Register srcBuff) { 6078 assert(srcBuff->encoding() != 0, "src buffer address can't be in Z_R0"); 6079 assert(srcBuff->encoding() % 2 == 0, "src buffer/len must be an even/odd register pair"); 6080 6081 Label retry; 6082 bind(retry); 6083 Assembler::z_klmd(Z_R0, srcBuff); 6084 Assembler::z_brc(Assembler::bcondOverflow /* CC==3 (iterate) */, retry); 6085 } 6086 6087 void MacroAssembler::km(Register dstBuff, Register srcBuff) { 6088 // DstBuff and srcBuff are allowed to be the same register (encryption in-place). 6089 // DstBuff and srcBuff storage must not overlap destructively, and neither must overlap the parameter block. 6090 assert(srcBuff->encoding() != 0, "src buffer address can't be in Z_R0"); 6091 assert(dstBuff->encoding() % 2 == 0, "dst buffer addr must be an even register"); 6092 assert(srcBuff->encoding() % 2 == 0, "src buffer addr/len must be an even/odd register pair"); 6093 6094 Label retry; 6095 bind(retry); 6096 Assembler::z_km(dstBuff, srcBuff); 6097 Assembler::z_brc(Assembler::bcondOverflow /* CC==3 (iterate) */, retry); 6098 } 6099 6100 void MacroAssembler::kmc(Register dstBuff, Register srcBuff) { 6101 // DstBuff and srcBuff are allowed to be the same register (encryption in-place). 6102 // DstBuff and srcBuff storage must not overlap destructively, and neither must overlap the parameter block. 6103 assert(srcBuff->encoding() != 0, "src buffer address can't be in Z_R0"); 6104 assert(dstBuff->encoding() % 2 == 0, "dst buffer addr must be an even register"); 6105 assert(srcBuff->encoding() % 2 == 0, "src buffer addr/len must be an even/odd register pair"); 6106 6107 Label retry; 6108 bind(retry); 6109 Assembler::z_kmc(dstBuff, srcBuff); 6110 Assembler::z_brc(Assembler::bcondOverflow /* CC==3 (iterate) */, retry); 6111 } 6112 6113 void MacroAssembler::cksm(Register crcBuff, Register srcBuff) { 6114 assert(srcBuff->encoding() % 2 == 0, "src buffer addr/len must be an even/odd register pair"); 6115 6116 Label retry; 6117 bind(retry); 6118 Assembler::z_cksm(crcBuff, srcBuff); 6119 Assembler::z_brc(Assembler::bcondOverflow /* CC==3 (iterate) */, retry); 6120 } 6121 6122 void MacroAssembler::translate_oo(Register r1, Register r2, uint m3) { 6123 assert(r1->encoding() % 2 == 0, "dst addr/src len must be an even/odd register pair"); 6124 assert((m3 & 0b1110) == 0, "Unused mask bits must be zero"); 6125 6126 Label retry; 6127 bind(retry); 6128 Assembler::z_troo(r1, r2, m3); 6129 Assembler::z_brc(Assembler::bcondOverflow /* CC==3 (iterate) */, retry); 6130 } 6131 6132 void MacroAssembler::translate_ot(Register r1, Register r2, uint m3) { 6133 assert(r1->encoding() % 2 == 0, "dst addr/src len must be an even/odd register pair"); 6134 assert((m3 & 0b1110) == 0, "Unused mask bits must be zero"); 6135 6136 Label retry; 6137 bind(retry); 6138 Assembler::z_trot(r1, r2, m3); 6139 Assembler::z_brc(Assembler::bcondOverflow /* CC==3 (iterate) */, retry); 6140 } 6141 6142 void MacroAssembler::translate_to(Register r1, Register r2, uint m3) { 6143 assert(r1->encoding() % 2 == 0, "dst addr/src len must be an even/odd register pair"); 6144 assert((m3 & 0b1110) == 0, "Unused mask bits must be zero"); 6145 6146 Label retry; 6147 bind(retry); 6148 Assembler::z_trto(r1, r2, m3); 6149 Assembler::z_brc(Assembler::bcondOverflow /* CC==3 (iterate) */, retry); 6150 } 6151 6152 void MacroAssembler::translate_tt(Register r1, Register r2, uint m3) { 6153 assert(r1->encoding() % 2 == 0, "dst addr/src len must be an even/odd register pair"); 6154 assert((m3 & 0b1110) == 0, "Unused mask bits must be zero"); 6155 6156 Label retry; 6157 bind(retry); 6158 Assembler::z_trtt(r1, r2, m3); 6159 Assembler::z_brc(Assembler::bcondOverflow /* CC==3 (iterate) */, retry); 6160 } 6161 6162 //--------------------------------------- 6163 // Helpers for Intrinsic Emitters 6164 //--------------------------------------- 6165 6166 /** 6167 * uint32_t crc; 6168 * timesXtoThe32[crc & 0xFF] ^ (crc >> 8); 6169 */ 6170 void MacroAssembler::fold_byte_crc32(Register crc, Register val, Register table, Register tmp) { 6171 assert_different_registers(crc, table, tmp); 6172 assert_different_registers(val, table); 6173 if (crc == val) { // Must rotate first to use the unmodified value. 6174 rotate_then_insert(tmp, val, 56-2, 63-2, 2, true); // Insert byte 7 of val, shifted left by 2, into byte 6..7 of tmp, clear the rest. 6175 z_srl(crc, 8); // Unsigned shift, clear leftmost 8 bits. 6176 } else { 6177 z_srl(crc, 8); // Unsigned shift, clear leftmost 8 bits. 6178 rotate_then_insert(tmp, val, 56-2, 63-2, 2, true); // Insert byte 7 of val, shifted left by 2, into byte 6..7 of tmp, clear the rest. 6179 } 6180 z_x(crc, Address(table, tmp, 0)); 6181 } 6182 6183 /** 6184 * uint32_t crc; 6185 * timesXtoThe32[crc & 0xFF] ^ (crc >> 8); 6186 */ 6187 void MacroAssembler::fold_8bit_crc32(Register crc, Register table, Register tmp) { 6188 fold_byte_crc32(crc, crc, table, tmp); 6189 } 6190 6191 /** 6192 * Emits code to update CRC-32 with a byte value according to constants in table. 6193 * 6194 * @param [in,out]crc Register containing the crc. 6195 * @param [in]val Register containing the byte to fold into the CRC. 6196 * @param [in]table Register containing the table of crc constants. 6197 * 6198 * uint32_t crc; 6199 * val = crc_table[(val ^ crc) & 0xFF]; 6200 * crc = val ^ (crc >> 8); 6201 */ 6202 void MacroAssembler::update_byte_crc32(Register crc, Register val, Register table) { 6203 z_xr(val, crc); 6204 fold_byte_crc32(crc, val, table, val); 6205 } 6206 6207 6208 /** 6209 * @param crc register containing existing CRC (32-bit) 6210 * @param buf register pointing to input byte buffer (byte*) 6211 * @param len register containing number of bytes 6212 * @param table register pointing to CRC table 6213 */ 6214 void MacroAssembler::update_byteLoop_crc32(Register crc, Register buf, Register len, Register table, Register data) { 6215 assert_different_registers(crc, buf, len, table, data); 6216 6217 Label L_mainLoop, L_done; 6218 const int mainLoop_stepping = 1; 6219 6220 // Process all bytes in a single-byte loop. 6221 z_ltr(len, len); 6222 z_brnh(L_done); 6223 6224 bind(L_mainLoop); 6225 z_llgc(data, Address(buf, (intptr_t)0));// Current byte of input buffer (zero extended). Avoids garbage in upper half of register. 6226 add2reg(buf, mainLoop_stepping); // Advance buffer position. 6227 update_byte_crc32(crc, data, table); 6228 z_brct(len, L_mainLoop); // Iterate. 6229 6230 bind(L_done); 6231 } 6232 6233 /** 6234 * Emits code to update CRC-32 with a 4-byte value according to constants in table. 6235 * Implementation according to jdk/src/share/native/java/util/zip/zlib-1.2.8/crc32.c. 6236 * 6237 */ 6238 void MacroAssembler::update_1word_crc32(Register crc, Register buf, Register table, int bufDisp, int bufInc, 6239 Register t0, Register t1, Register t2, Register t3) { 6240 // This is what we implement (the DOBIG4 part): 6241 // 6242 // #define DOBIG4 c ^= *++buf4; \ 6243 // c = crc_table[4][c & 0xff] ^ crc_table[5][(c >> 8) & 0xff] ^ \ 6244 // crc_table[6][(c >> 16) & 0xff] ^ crc_table[7][c >> 24] 6245 // #define DOBIG32 DOBIG4; DOBIG4; DOBIG4; DOBIG4; DOBIG4; DOBIG4; DOBIG4; DOBIG4 6246 // Pre-calculate (constant) column offsets, use columns 4..7 for big-endian. 6247 const int ix0 = 4*(4*CRC32_COLUMN_SIZE); 6248 const int ix1 = 5*(4*CRC32_COLUMN_SIZE); 6249 const int ix2 = 6*(4*CRC32_COLUMN_SIZE); 6250 const int ix3 = 7*(4*CRC32_COLUMN_SIZE); 6251 6252 // XOR crc with next four bytes of buffer. 6253 lgr_if_needed(t0, crc); 6254 z_x(t0, Address(buf, bufDisp)); 6255 if (bufInc != 0) { 6256 add2reg(buf, bufInc); 6257 } 6258 6259 // Chop crc into 4 single-byte pieces, shifted left 2 bits, to form the table indices. 6260 rotate_then_insert(t3, t0, 56-2, 63-2, 2, true); // ((c >> 0) & 0xff) << 2 6261 rotate_then_insert(t2, t0, 56-2, 63-2, 2-8, true); // ((c >> 8) & 0xff) << 2 6262 rotate_then_insert(t1, t0, 56-2, 63-2, 2-16, true); // ((c >> 16) & 0xff) << 2 6263 rotate_then_insert(t0, t0, 56-2, 63-2, 2-24, true); // ((c >> 24) & 0xff) << 2 6264 6265 // XOR indexed table values to calculate updated crc. 6266 z_ly(t2, Address(table, t2, (intptr_t)ix1)); 6267 z_ly(t0, Address(table, t0, (intptr_t)ix3)); 6268 z_xy(t2, Address(table, t3, (intptr_t)ix0)); 6269 z_xy(t0, Address(table, t1, (intptr_t)ix2)); 6270 z_xr(t0, t2); // Now t0 contains the updated CRC value. 6271 lgr_if_needed(crc, t0); 6272 } 6273 6274 /** 6275 * @param crc register containing existing CRC (32-bit) 6276 * @param buf register pointing to input byte buffer (byte*) 6277 * @param len register containing number of bytes 6278 * @param table register pointing to CRC table 6279 * 6280 * uses Z_R10..Z_R13 as work register. Must be saved/restored by caller! 6281 */ 6282 void MacroAssembler::kernel_crc32_1word(Register crc, Register buf, Register len, Register table, 6283 Register t0, Register t1, Register t2, Register t3, 6284 bool invertCRC) { 6285 assert_different_registers(crc, buf, len, table); 6286 6287 Label L_mainLoop, L_tail; 6288 Register data = t0; 6289 Register ctr = Z_R0; 6290 const int mainLoop_stepping = 4; 6291 const int log_stepping = exact_log2(mainLoop_stepping); 6292 6293 // Don't test for len <= 0 here. This pathological case should not occur anyway. 6294 // Optimizing for it by adding a test and a branch seems to be a waste of CPU cycles. 6295 // The situation itself is detected and handled correctly by the conditional branches 6296 // following aghi(len, -stepping) and aghi(len, +stepping). 6297 6298 if (invertCRC) { 6299 not_(crc, noreg, false); // 1s complement of crc 6300 } 6301 6302 // Check for short (<4 bytes) buffer. 6303 z_srag(ctr, len, log_stepping); 6304 z_brnh(L_tail); 6305 6306 z_lrvr(crc, crc); // Revert byte order because we are dealing with big-endian data. 6307 rotate_then_insert(len, len, 64-log_stepping, 63, 0, true); // #bytes for tailLoop 6308 6309 BIND(L_mainLoop); 6310 update_1word_crc32(crc, buf, table, 0, mainLoop_stepping, crc, t1, t2, t3); 6311 z_brct(ctr, L_mainLoop); // Iterate. 6312 6313 z_lrvr(crc, crc); // Revert byte order back to original. 6314 6315 // Process last few (<8) bytes of buffer. 6316 BIND(L_tail); 6317 update_byteLoop_crc32(crc, buf, len, table, data); 6318 6319 if (invertCRC) { 6320 not_(crc, noreg, false); // 1s complement of crc 6321 } 6322 } 6323 6324 /** 6325 * @param crc register containing existing CRC (32-bit) 6326 * @param buf register pointing to input byte buffer (byte*) 6327 * @param len register containing number of bytes 6328 * @param table register pointing to CRC table 6329 */ 6330 void MacroAssembler::kernel_crc32_1byte(Register crc, Register buf, Register len, Register table, 6331 Register t0, Register t1, Register t2, Register t3, 6332 bool invertCRC) { 6333 assert_different_registers(crc, buf, len, table); 6334 Register data = t0; 6335 6336 if (invertCRC) { 6337 not_(crc, noreg, false); // 1s complement of crc 6338 } 6339 6340 update_byteLoop_crc32(crc, buf, len, table, data); 6341 6342 if (invertCRC) { 6343 not_(crc, noreg, false); // 1s complement of crc 6344 } 6345 } 6346 6347 void MacroAssembler::kernel_crc32_singleByte(Register crc, Register buf, Register len, Register table, Register tmp, 6348 bool invertCRC) { 6349 assert_different_registers(crc, buf, len, table, tmp); 6350 6351 if (invertCRC) { 6352 not_(crc, noreg, false); // 1s complement of crc 6353 } 6354 6355 z_llgc(tmp, Address(buf, (intptr_t)0)); // Current byte of input buffer (zero extended). Avoids garbage in upper half of register. 6356 update_byte_crc32(crc, tmp, table); 6357 6358 if (invertCRC) { 6359 not_(crc, noreg, false); // 1s complement of crc 6360 } 6361 } 6362 6363 void MacroAssembler::kernel_crc32_singleByteReg(Register crc, Register val, Register table, 6364 bool invertCRC) { 6365 assert_different_registers(crc, val, table); 6366 6367 if (invertCRC) { 6368 not_(crc, noreg, false); // 1s complement of crc 6369 } 6370 6371 update_byte_crc32(crc, val, table); 6372 6373 if (invertCRC) { 6374 not_(crc, noreg, false); // 1s complement of crc 6375 } 6376 } 6377 6378 // 6379 // Code for BigInteger::multiplyToLen() intrinsic. 6380 // 6381 6382 // dest_lo += src1 + src2 6383 // dest_hi += carry1 + carry2 6384 // Z_R7 is destroyed ! 6385 void MacroAssembler::add2_with_carry(Register dest_hi, Register dest_lo, 6386 Register src1, Register src2) { 6387 clear_reg(Z_R7); 6388 z_algr(dest_lo, src1); 6389 z_alcgr(dest_hi, Z_R7); 6390 z_algr(dest_lo, src2); 6391 z_alcgr(dest_hi, Z_R7); 6392 } 6393 6394 // Multiply 64 bit by 64 bit first loop. 6395 void MacroAssembler::multiply_64_x_64_loop(Register x, Register xstart, 6396 Register x_xstart, 6397 Register y, Register y_idx, 6398 Register z, 6399 Register carry, 6400 Register product, 6401 Register idx, Register kdx) { 6402 // jlong carry, x[], y[], z[]; 6403 // for (int idx=ystart, kdx=ystart+1+xstart; idx >= 0; idx--, kdx--) { 6404 // huge_128 product = y[idx] * x[xstart] + carry; 6405 // z[kdx] = (jlong)product; 6406 // carry = (jlong)(product >>> 64); 6407 // } 6408 // z[xstart] = carry; 6409 6410 Label L_first_loop, L_first_loop_exit; 6411 Label L_one_x, L_one_y, L_multiply; 6412 6413 z_aghi(xstart, -1); 6414 z_brl(L_one_x); // Special case: length of x is 1. 6415 6416 // Load next two integers of x. 6417 z_sllg(Z_R1_scratch, xstart, LogBytesPerInt); 6418 mem2reg_opt(x_xstart, Address(x, Z_R1_scratch, 0)); 6419 6420 6421 bind(L_first_loop); 6422 6423 z_aghi(idx, -1); 6424 z_brl(L_first_loop_exit); 6425 z_aghi(idx, -1); 6426 z_brl(L_one_y); 6427 6428 // Load next two integers of y. 6429 z_sllg(Z_R1_scratch, idx, LogBytesPerInt); 6430 mem2reg_opt(y_idx, Address(y, Z_R1_scratch, 0)); 6431 6432 6433 bind(L_multiply); 6434 6435 Register multiplicand = product->successor(); 6436 Register product_low = multiplicand; 6437 6438 lgr_if_needed(multiplicand, x_xstart); 6439 z_mlgr(product, y_idx); // multiplicand * y_idx -> product::multiplicand 6440 clear_reg(Z_R7); 6441 z_algr(product_low, carry); // Add carry to result. 6442 z_alcgr(product, Z_R7); // Add carry of the last addition. 6443 add2reg(kdx, -2); 6444 6445 // Store result. 6446 z_sllg(Z_R7, kdx, LogBytesPerInt); 6447 reg2mem_opt(product_low, Address(z, Z_R7, 0)); 6448 lgr_if_needed(carry, product); 6449 z_bru(L_first_loop); 6450 6451 6452 bind(L_one_y); // Load one 32 bit portion of y as (0,value). 6453 6454 clear_reg(y_idx); 6455 mem2reg_opt(y_idx, Address(y, (intptr_t) 0), false); 6456 z_bru(L_multiply); 6457 6458 6459 bind(L_one_x); // Load one 32 bit portion of x as (0,value). 6460 6461 clear_reg(x_xstart); 6462 mem2reg_opt(x_xstart, Address(x, (intptr_t) 0), false); 6463 z_bru(L_first_loop); 6464 6465 bind(L_first_loop_exit); 6466 } 6467 6468 // Multiply 64 bit by 64 bit and add 128 bit. 6469 void MacroAssembler::multiply_add_128_x_128(Register x_xstart, Register y, 6470 Register z, 6471 Register yz_idx, Register idx, 6472 Register carry, Register product, 6473 int offset) { 6474 // huge_128 product = (y[idx] * x_xstart) + z[kdx] + carry; 6475 // z[kdx] = (jlong)product; 6476 6477 Register multiplicand = product->successor(); 6478 Register product_low = multiplicand; 6479 6480 z_sllg(Z_R7, idx, LogBytesPerInt); 6481 mem2reg_opt(yz_idx, Address(y, Z_R7, offset)); 6482 6483 lgr_if_needed(multiplicand, x_xstart); 6484 z_mlgr(product, yz_idx); // multiplicand * yz_idx -> product::multiplicand 6485 mem2reg_opt(yz_idx, Address(z, Z_R7, offset)); 6486 6487 add2_with_carry(product, product_low, carry, yz_idx); 6488 6489 z_sllg(Z_R7, idx, LogBytesPerInt); 6490 reg2mem_opt(product_low, Address(z, Z_R7, offset)); 6491 6492 } 6493 6494 // Multiply 128 bit by 128 bit. Unrolled inner loop. 6495 void MacroAssembler::multiply_128_x_128_loop(Register x_xstart, 6496 Register y, Register z, 6497 Register yz_idx, Register idx, 6498 Register jdx, 6499 Register carry, Register product, 6500 Register carry2) { 6501 // jlong carry, x[], y[], z[]; 6502 // int kdx = ystart+1; 6503 // for (int idx=ystart-2; idx >= 0; idx -= 2) { // Third loop 6504 // huge_128 product = (y[idx+1] * x_xstart) + z[kdx+idx+1] + carry; 6505 // z[kdx+idx+1] = (jlong)product; 6506 // jlong carry2 = (jlong)(product >>> 64); 6507 // product = (y[idx] * x_xstart) + z[kdx+idx] + carry2; 6508 // z[kdx+idx] = (jlong)product; 6509 // carry = (jlong)(product >>> 64); 6510 // } 6511 // idx += 2; 6512 // if (idx > 0) { 6513 // product = (y[idx] * x_xstart) + z[kdx+idx] + carry; 6514 // z[kdx+idx] = (jlong)product; 6515 // carry = (jlong)(product >>> 64); 6516 // } 6517 6518 Label L_third_loop, L_third_loop_exit, L_post_third_loop_done; 6519 6520 // scale the index 6521 lgr_if_needed(jdx, idx); 6522 and_imm(jdx, 0xfffffffffffffffcL); 6523 rshift(jdx, 2); 6524 6525 6526 bind(L_third_loop); 6527 6528 z_aghi(jdx, -1); 6529 z_brl(L_third_loop_exit); 6530 add2reg(idx, -4); 6531 6532 multiply_add_128_x_128(x_xstart, y, z, yz_idx, idx, carry, product, 8); 6533 lgr_if_needed(carry2, product); 6534 6535 multiply_add_128_x_128(x_xstart, y, z, yz_idx, idx, carry2, product, 0); 6536 lgr_if_needed(carry, product); 6537 z_bru(L_third_loop); 6538 6539 6540 bind(L_third_loop_exit); // Handle any left-over operand parts. 6541 6542 and_imm(idx, 0x3); 6543 z_brz(L_post_third_loop_done); 6544 6545 Label L_check_1; 6546 6547 z_aghi(idx, -2); 6548 z_brl(L_check_1); 6549 6550 multiply_add_128_x_128(x_xstart, y, z, yz_idx, idx, carry, product, 0); 6551 lgr_if_needed(carry, product); 6552 6553 6554 bind(L_check_1); 6555 6556 add2reg(idx, 0x2); 6557 and_imm(idx, 0x1); 6558 z_aghi(idx, -1); 6559 z_brl(L_post_third_loop_done); 6560 6561 Register multiplicand = product->successor(); 6562 Register product_low = multiplicand; 6563 6564 z_sllg(Z_R7, idx, LogBytesPerInt); 6565 clear_reg(yz_idx); 6566 mem2reg_opt(yz_idx, Address(y, Z_R7, 0), false); 6567 lgr_if_needed(multiplicand, x_xstart); 6568 z_mlgr(product, yz_idx); // multiplicand * yz_idx -> product::multiplicand 6569 clear_reg(yz_idx); 6570 mem2reg_opt(yz_idx, Address(z, Z_R7, 0), false); 6571 6572 add2_with_carry(product, product_low, yz_idx, carry); 6573 6574 z_sllg(Z_R7, idx, LogBytesPerInt); 6575 reg2mem_opt(product_low, Address(z, Z_R7, 0), false); 6576 rshift(product_low, 32); 6577 6578 lshift(product, 32); 6579 z_ogr(product_low, product); 6580 lgr_if_needed(carry, product_low); 6581 6582 bind(L_post_third_loop_done); 6583 } 6584 6585 void MacroAssembler::multiply_to_len(Register x, Register xlen, 6586 Register y, Register ylen, 6587 Register z, 6588 Register tmp1, Register tmp2, 6589 Register tmp3, Register tmp4, 6590 Register tmp5) { 6591 ShortBranchVerifier sbv(this); 6592 6593 assert_different_registers(x, xlen, y, ylen, z, 6594 tmp1, tmp2, tmp3, tmp4, tmp5, Z_R1_scratch, Z_R7); 6595 assert_different_registers(x, xlen, y, ylen, z, 6596 tmp1, tmp2, tmp3, tmp4, tmp5, Z_R8); 6597 6598 z_stmg(Z_R7, Z_R13, _z_abi(gpr7), Z_SP); 6599 6600 // In openJdk, we store the argument as 32-bit value to slot. 6601 Address zlen(Z_SP, _z_abi(remaining_cargs)); // Int in long on big endian. 6602 6603 const Register idx = tmp1; 6604 const Register kdx = tmp2; 6605 const Register xstart = tmp3; 6606 6607 const Register y_idx = tmp4; 6608 const Register carry = tmp5; 6609 const Register product = Z_R0_scratch; 6610 const Register x_xstart = Z_R8; 6611 6612 // First Loop. 6613 // 6614 // final static long LONG_MASK = 0xffffffffL; 6615 // int xstart = xlen - 1; 6616 // int ystart = ylen - 1; 6617 // long carry = 0; 6618 // for (int idx=ystart, kdx=ystart+1+xstart; idx >= 0; idx-, kdx--) { 6619 // long product = (y[idx] & LONG_MASK) * (x[xstart] & LONG_MASK) + carry; 6620 // z[kdx] = (int)product; 6621 // carry = product >>> 32; 6622 // } 6623 // z[xstart] = (int)carry; 6624 // 6625 6626 lgr_if_needed(idx, ylen); // idx = ylen 6627 z_llgf(kdx, zlen); // C2 does not respect int to long conversion for stub calls, thus load zero-extended. 6628 clear_reg(carry); // carry = 0 6629 6630 Label L_done; 6631 6632 lgr_if_needed(xstart, xlen); 6633 z_aghi(xstart, -1); 6634 z_brl(L_done); 6635 6636 multiply_64_x_64_loop(x, xstart, x_xstart, y, y_idx, z, carry, product, idx, kdx); 6637 6638 NearLabel L_second_loop; 6639 compare64_and_branch(kdx, RegisterOrConstant((intptr_t) 0), bcondEqual, L_second_loop); 6640 6641 NearLabel L_carry; 6642 z_aghi(kdx, -1); 6643 z_brz(L_carry); 6644 6645 // Store lower 32 bits of carry. 6646 z_sllg(Z_R1_scratch, kdx, LogBytesPerInt); 6647 reg2mem_opt(carry, Address(z, Z_R1_scratch, 0), false); 6648 rshift(carry, 32); 6649 z_aghi(kdx, -1); 6650 6651 6652 bind(L_carry); 6653 6654 // Store upper 32 bits of carry. 6655 z_sllg(Z_R1_scratch, kdx, LogBytesPerInt); 6656 reg2mem_opt(carry, Address(z, Z_R1_scratch, 0), false); 6657 6658 // Second and third (nested) loops. 6659 // 6660 // for (int i = xstart-1; i >= 0; i--) { // Second loop 6661 // carry = 0; 6662 // for (int jdx=ystart, k=ystart+1+i; jdx >= 0; jdx--, k--) { // Third loop 6663 // long product = (y[jdx] & LONG_MASK) * (x[i] & LONG_MASK) + 6664 // (z[k] & LONG_MASK) + carry; 6665 // z[k] = (int)product; 6666 // carry = product >>> 32; 6667 // } 6668 // z[i] = (int)carry; 6669 // } 6670 // 6671 // i = xlen, j = tmp1, k = tmp2, carry = tmp5, x[i] = rdx 6672 6673 const Register jdx = tmp1; 6674 6675 bind(L_second_loop); 6676 6677 clear_reg(carry); // carry = 0; 6678 lgr_if_needed(jdx, ylen); // j = ystart+1 6679 6680 z_aghi(xstart, -1); // i = xstart-1; 6681 z_brl(L_done); 6682 6683 // Use free slots in the current stackframe instead of push/pop. 6684 Address zsave(Z_SP, _z_abi(carg_1)); 6685 reg2mem_opt(z, zsave); 6686 6687 6688 Label L_last_x; 6689 6690 z_sllg(Z_R1_scratch, xstart, LogBytesPerInt); 6691 load_address(z, Address(z, Z_R1_scratch, 4)); // z = z + k - j 6692 z_aghi(xstart, -1); // i = xstart-1; 6693 z_brl(L_last_x); 6694 6695 z_sllg(Z_R1_scratch, xstart, LogBytesPerInt); 6696 mem2reg_opt(x_xstart, Address(x, Z_R1_scratch, 0)); 6697 6698 6699 Label L_third_loop_prologue; 6700 6701 bind(L_third_loop_prologue); 6702 6703 Address xsave(Z_SP, _z_abi(carg_2)); 6704 Address xlensave(Z_SP, _z_abi(carg_3)); 6705 Address ylensave(Z_SP, _z_abi(carg_4)); 6706 6707 reg2mem_opt(x, xsave); 6708 reg2mem_opt(xstart, xlensave); 6709 reg2mem_opt(ylen, ylensave); 6710 6711 6712 multiply_128_x_128_loop(x_xstart, y, z, y_idx, jdx, ylen, carry, product, x); 6713 6714 mem2reg_opt(z, zsave); 6715 mem2reg_opt(x, xsave); 6716 mem2reg_opt(xlen, xlensave); // This is the decrement of the loop counter! 6717 mem2reg_opt(ylen, ylensave); 6718 6719 add2reg(tmp3, 1, xlen); 6720 z_sllg(Z_R1_scratch, tmp3, LogBytesPerInt); 6721 reg2mem_opt(carry, Address(z, Z_R1_scratch, 0), false); 6722 z_aghi(tmp3, -1); 6723 z_brl(L_done); 6724 6725 rshift(carry, 32); 6726 z_sllg(Z_R1_scratch, tmp3, LogBytesPerInt); 6727 reg2mem_opt(carry, Address(z, Z_R1_scratch, 0), false); 6728 z_bru(L_second_loop); 6729 6730 // Next infrequent code is moved outside loops. 6731 bind(L_last_x); 6732 6733 clear_reg(x_xstart); 6734 mem2reg_opt(x_xstart, Address(x, (intptr_t) 0), false); 6735 z_bru(L_third_loop_prologue); 6736 6737 bind(L_done); 6738 6739 z_lmg(Z_R7, Z_R13, _z_abi(gpr7), Z_SP); 6740 } 6741 6742 #ifndef PRODUCT 6743 // Assert if CC indicates "not equal" (check_equal==true) or "equal" (check_equal==false). 6744 void MacroAssembler::asm_assert(bool check_equal, const char *msg, int id) { 6745 Label ok; 6746 if (check_equal) { 6747 z_bre(ok); 6748 } else { 6749 z_brne(ok); 6750 } 6751 stop(msg, id); 6752 bind(ok); 6753 } 6754 6755 // Assert if CC indicates "low". 6756 void MacroAssembler::asm_assert_low(const char *msg, int id) { 6757 Label ok; 6758 z_brnl(ok); 6759 stop(msg, id); 6760 bind(ok); 6761 } 6762 6763 // Assert if CC indicates "high". 6764 void MacroAssembler::asm_assert_high(const char *msg, int id) { 6765 Label ok; 6766 z_brnh(ok); 6767 stop(msg, id); 6768 bind(ok); 6769 } 6770 6771 // Assert if CC indicates "not equal" (check_equal==true) or "equal" (check_equal==false) 6772 // generate non-relocatable code. 6773 void MacroAssembler::asm_assert_static(bool check_equal, const char *msg, int id) { 6774 Label ok; 6775 if (check_equal) { z_bre(ok); } 6776 else { z_brne(ok); } 6777 stop_static(msg, id); 6778 bind(ok); 6779 } 6780 6781 void MacroAssembler::asm_assert_mems_zero(bool check_equal, bool allow_relocation, int size, int64_t mem_offset, 6782 Register mem_base, const char* msg, int id) { 6783 switch (size) { 6784 case 4: 6785 load_and_test_int(Z_R0, Address(mem_base, mem_offset)); 6786 break; 6787 case 8: 6788 load_and_test_long(Z_R0, Address(mem_base, mem_offset)); 6789 break; 6790 default: 6791 ShouldNotReachHere(); 6792 } 6793 if (allow_relocation) { asm_assert(check_equal, msg, id); } 6794 else { asm_assert_static(check_equal, msg, id); } 6795 } 6796 6797 // Check the condition 6798 // expected_size == FP - SP 6799 // after transformation: 6800 // expected_size - FP + SP == 0 6801 // Destroys Register expected_size if no tmp register is passed. 6802 void MacroAssembler::asm_assert_frame_size(Register expected_size, Register tmp, const char* msg, int id) { 6803 if (tmp == noreg) { 6804 tmp = expected_size; 6805 } else { 6806 if (tmp != expected_size) { 6807 z_lgr(tmp, expected_size); 6808 } 6809 z_algr(tmp, Z_SP); 6810 z_slg(tmp, 0, Z_R0, Z_SP); 6811 asm_assert_eq(msg, id); 6812 } 6813 } 6814 #endif // !PRODUCT 6815 6816 void MacroAssembler::verify_thread() { 6817 if (VerifyThread) { 6818 unimplemented("", 117); 6819 } 6820 } 6821 6822 // Plausibility check for oops. 6823 void MacroAssembler::verify_oop(Register oop, const char* msg) { 6824 if (!VerifyOops) return; 6825 6826 BLOCK_COMMENT("verify_oop {"); 6827 Register tmp = Z_R0; 6828 unsigned int nbytes_save = 5*BytesPerWord; 6829 address entry = StubRoutines::verify_oop_subroutine_entry_address(); 6830 6831 save_return_pc(); 6832 push_frame_abi160(nbytes_save); 6833 z_stmg(Z_R1, Z_R5, frame::z_abi_160_size, Z_SP); 6834 6835 z_lgr(Z_ARG2, oop); 6836 load_const(Z_ARG1, (address) msg); 6837 load_const(Z_R1, entry); 6838 z_lg(Z_R1, 0, Z_R1); 6839 call_c(Z_R1); 6840 6841 z_lmg(Z_R1, Z_R5, frame::z_abi_160_size, Z_SP); 6842 pop_frame(); 6843 restore_return_pc(); 6844 6845 BLOCK_COMMENT("} verify_oop "); 6846 } 6847 6848 const char* MacroAssembler::stop_types[] = { 6849 "stop", 6850 "untested", 6851 "unimplemented", 6852 "shouldnotreachhere" 6853 }; 6854 6855 static void stop_on_request(const char* tp, const char* msg) { 6856 tty->print("Z assembly code requires stop: (%s) %s\n", tp, msg); 6857 guarantee(false, "Z assembly code requires stop: %s", msg); 6858 } 6859 6860 void MacroAssembler::stop(int type, const char* msg, int id) { 6861 BLOCK_COMMENT(err_msg("stop: %s {", msg)); 6862 6863 // Setup arguments. 6864 load_const(Z_ARG1, (void*) stop_types[type%stop_end]); 6865 load_const(Z_ARG2, (void*) msg); 6866 get_PC(Z_R14); // Following code pushes a frame without entering a new function. Use current pc as return address. 6867 save_return_pc(); // Saves return pc Z_R14. 6868 push_frame_abi160(0); 6869 call_VM_leaf(CAST_FROM_FN_PTR(address, stop_on_request), Z_ARG1, Z_ARG2); 6870 // The plain disassembler does not recognize illtrap. It instead displays 6871 // a 32-bit value. Issueing two illtraps assures the disassembler finds 6872 // the proper beginning of the next instruction. 6873 z_illtrap(); // Illegal instruction. 6874 z_illtrap(); // Illegal instruction. 6875 6876 BLOCK_COMMENT(" } stop"); 6877 } 6878 6879 // Special version of stop() for code size reduction. 6880 // Reuses the previously generated call sequence, if any. 6881 // Generates the call sequence on its own, if necessary. 6882 // Note: This code will work only in non-relocatable code! 6883 // The relative address of the data elements (arg1, arg2) must not change. 6884 // The reentry point must not move relative to it's users. This prerequisite 6885 // should be given for "hand-written" code, if all chain calls are in the same code blob. 6886 // Generated code must not undergo any transformation, e.g. ShortenBranches, to be safe. 6887 address MacroAssembler::stop_chain(address reentry, int type, const char* msg, int id, bool allow_relocation) { 6888 BLOCK_COMMENT(err_msg("stop_chain(%s,%s): %s {", reentry==NULL?"init":"cont", allow_relocation?"reloc ":"static", msg)); 6889 6890 // Setup arguments. 6891 if (allow_relocation) { 6892 // Relocatable version (for comparison purposes). Remove after some time. 6893 load_const(Z_ARG1, (void*) stop_types[type%stop_end]); 6894 load_const(Z_ARG2, (void*) msg); 6895 } else { 6896 load_absolute_address(Z_ARG1, (address)stop_types[type%stop_end]); 6897 load_absolute_address(Z_ARG2, (address)msg); 6898 } 6899 if ((reentry != NULL) && RelAddr::is_in_range_of_RelAddr16(reentry, pc())) { 6900 BLOCK_COMMENT("branch to reentry point:"); 6901 z_brc(bcondAlways, reentry); 6902 } else { 6903 BLOCK_COMMENT("reentry point:"); 6904 reentry = pc(); // Re-entry point for subsequent stop calls. 6905 save_return_pc(); // Saves return pc Z_R14. 6906 push_frame_abi160(0); 6907 if (allow_relocation) { 6908 reentry = NULL; // Prevent reentry if code relocation is allowed. 6909 call_VM_leaf(CAST_FROM_FN_PTR(address, stop_on_request), Z_ARG1, Z_ARG2); 6910 } else { 6911 call_VM_leaf_static(CAST_FROM_FN_PTR(address, stop_on_request), Z_ARG1, Z_ARG2); 6912 } 6913 z_illtrap(); // Illegal instruction as emergency stop, should the above call return. 6914 } 6915 BLOCK_COMMENT(" } stop_chain"); 6916 6917 return reentry; 6918 } 6919 6920 // Special version of stop() for code size reduction. 6921 // Assumes constant relative addresses for data and runtime call. 6922 void MacroAssembler::stop_static(int type, const char* msg, int id) { 6923 stop_chain(NULL, type, msg, id, false); 6924 } 6925 6926 void MacroAssembler::stop_subroutine() { 6927 unimplemented("stop_subroutine", 710); 6928 } 6929 6930 // Prints msg to stdout from within generated code.. 6931 void MacroAssembler::warn(const char* msg) { 6932 RegisterSaver::save_live_registers(this, RegisterSaver::all_registers, Z_R14); 6933 load_absolute_address(Z_R1, (address) warning); 6934 load_absolute_address(Z_ARG1, (address) msg); 6935 (void) call(Z_R1); 6936 RegisterSaver::restore_live_registers(this, RegisterSaver::all_registers); 6937 } 6938 6939 #ifndef PRODUCT 6940 6941 // Write pattern 0x0101010101010101 in region [low-before, high+after]. 6942 void MacroAssembler::zap_from_to(Register low, Register high, Register val, Register addr, int before, int after) { 6943 if (!ZapEmptyStackFields) return; 6944 BLOCK_COMMENT("zap memory region {"); 6945 load_const_optimized(val, 0x0101010101010101); 6946 int size = before + after; 6947 if (low == high && size < 5 && size > 0) { 6948 int offset = -before*BytesPerWord; 6949 for (int i = 0; i < size; ++i) { 6950 z_stg(val, Address(low, offset)); 6951 offset +=(1*BytesPerWord); 6952 } 6953 } else { 6954 add2reg(addr, -before*BytesPerWord, low); 6955 if (after) { 6956 #ifdef ASSERT 6957 jlong check = after * BytesPerWord; 6958 assert(Immediate::is_simm32(check) && Immediate::is_simm32(-check), "value not encodable !"); 6959 #endif 6960 add2reg(high, after * BytesPerWord); 6961 } 6962 NearLabel loop; 6963 bind(loop); 6964 z_stg(val, Address(addr)); 6965 add2reg(addr, 8); 6966 compare64_and_branch(addr, high, bcondNotHigh, loop); 6967 if (after) { 6968 add2reg(high, -after * BytesPerWord); 6969 } 6970 } 6971 BLOCK_COMMENT("} zap memory region"); 6972 } 6973 #endif // !PRODUCT 6974 6975 SkipIfEqual::SkipIfEqual(MacroAssembler* masm, const bool* flag_addr, bool value, Register _rscratch) { 6976 _masm = masm; 6977 _masm->load_absolute_address(_rscratch, (address)flag_addr); 6978 _masm->load_and_test_int(_rscratch, Address(_rscratch)); 6979 if (value) { 6980 _masm->z_brne(_label); // Skip if true, i.e. != 0. 6981 } else { 6982 _masm->z_bre(_label); // Skip if false, i.e. == 0. 6983 } 6984 } 6985 6986 SkipIfEqual::~SkipIfEqual() { 6987 _masm->bind(_label); 6988 }