1 /* 2 * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved. 3 * Copyright (c) 2014, 2015, Red Hat Inc. 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 <sys/types.h> 27 28 #include "precompiled.hpp" 29 #include "asm/assembler.hpp" 30 #include "asm/assembler.inline.hpp" 31 #include "interpreter/interpreter.hpp" 32 33 #include "compiler/disassembler.hpp" 34 #include "memory/resourceArea.hpp" 35 #include "nativeInst_aarch64.hpp" 36 #include "oops/klass.inline.hpp" 37 #include "oops/oop.inline.hpp" 38 #include "opto/compile.hpp" 39 #include "opto/intrinsicnode.hpp" 40 #include "opto/node.hpp" 41 #include "prims/jvm.h" 42 #include "runtime/biasedLocking.hpp" 43 #include "runtime/icache.hpp" 44 #include "runtime/interfaceSupport.hpp" 45 #include "runtime/sharedRuntime.hpp" 46 #include "runtime/thread.hpp" 47 48 #if INCLUDE_ALL_GCS 49 #include "gc/g1/g1CollectedHeap.inline.hpp" 50 #include "gc/g1/g1SATBCardTableModRefBS.hpp" 51 #include "gc/g1/heapRegion.hpp" 52 #endif 53 54 #ifdef PRODUCT 55 #define BLOCK_COMMENT(str) /* nothing */ 56 #define STOP(error) stop(error) 57 #else 58 #define BLOCK_COMMENT(str) block_comment(str) 59 #define STOP(error) block_comment(error); stop(error) 60 #endif 61 62 #define BIND(label) bind(label); BLOCK_COMMENT(#label ":") 63 64 // Patch any kind of instruction; there may be several instructions. 65 // Return the total length (in bytes) of the instructions. 66 int MacroAssembler::pd_patch_instruction_size(address branch, address target) { 67 int instructions = 1; 68 assert((uint64_t)target < (1ul << 48), "48-bit overflow in address constant"); 69 long offset = (target - branch) >> 2; 70 unsigned insn = *(unsigned*)branch; 71 if ((Instruction_aarch64::extract(insn, 29, 24) & 0b111011) == 0b011000) { 72 // Load register (literal) 73 Instruction_aarch64::spatch(branch, 23, 5, offset); 74 } else if (Instruction_aarch64::extract(insn, 30, 26) == 0b00101) { 75 // Unconditional branch (immediate) 76 Instruction_aarch64::spatch(branch, 25, 0, offset); 77 } else if (Instruction_aarch64::extract(insn, 31, 25) == 0b0101010) { 78 // Conditional branch (immediate) 79 Instruction_aarch64::spatch(branch, 23, 5, offset); 80 } else if (Instruction_aarch64::extract(insn, 30, 25) == 0b011010) { 81 // Compare & branch (immediate) 82 Instruction_aarch64::spatch(branch, 23, 5, offset); 83 } else if (Instruction_aarch64::extract(insn, 30, 25) == 0b011011) { 84 // Test & branch (immediate) 85 Instruction_aarch64::spatch(branch, 18, 5, offset); 86 } else if (Instruction_aarch64::extract(insn, 28, 24) == 0b10000) { 87 // PC-rel. addressing 88 offset = target-branch; 89 int shift = Instruction_aarch64::extract(insn, 31, 31); 90 if (shift) { 91 u_int64_t dest = (u_int64_t)target; 92 uint64_t pc_page = (uint64_t)branch >> 12; 93 uint64_t adr_page = (uint64_t)target >> 12; 94 unsigned offset_lo = dest & 0xfff; 95 offset = adr_page - pc_page; 96 97 // We handle 4 types of PC relative addressing 98 // 1 - adrp Rx, target_page 99 // ldr/str Ry, [Rx, #offset_in_page] 100 // 2 - adrp Rx, target_page 101 // add Ry, Rx, #offset_in_page 102 // 3 - adrp Rx, target_page (page aligned reloc, offset == 0) 103 // movk Rx, #imm16<<32 104 // 4 - adrp Rx, target_page (page aligned reloc, offset == 0) 105 // In the first 3 cases we must check that Rx is the same in the adrp and the 106 // subsequent ldr/str, add or movk instruction. Otherwise we could accidentally end 107 // up treating a type 4 relocation as a type 1, 2 or 3 just because it happened 108 // to be followed by a random unrelated ldr/str, add or movk instruction. 109 // 110 unsigned insn2 = ((unsigned*)branch)[1]; 111 if (Instruction_aarch64::extract(insn2, 29, 24) == 0b111001 && 112 Instruction_aarch64::extract(insn, 4, 0) == 113 Instruction_aarch64::extract(insn2, 9, 5)) { 114 // Load/store register (unsigned immediate) 115 unsigned size = Instruction_aarch64::extract(insn2, 31, 30); 116 Instruction_aarch64::patch(branch + sizeof (unsigned), 117 21, 10, offset_lo >> size); 118 guarantee(((dest >> size) << size) == dest, "misaligned target"); 119 instructions = 2; 120 } else if (Instruction_aarch64::extract(insn2, 31, 22) == 0b1001000100 && 121 Instruction_aarch64::extract(insn, 4, 0) == 122 Instruction_aarch64::extract(insn2, 4, 0)) { 123 // add (immediate) 124 Instruction_aarch64::patch(branch + sizeof (unsigned), 125 21, 10, offset_lo); 126 instructions = 2; 127 } else if (Instruction_aarch64::extract(insn2, 31, 21) == 0b11110010110 && 128 Instruction_aarch64::extract(insn, 4, 0) == 129 Instruction_aarch64::extract(insn2, 4, 0)) { 130 // movk #imm16<<32 131 Instruction_aarch64::patch(branch + 4, 20, 5, (uint64_t)target >> 32); 132 long dest = ((long)target & 0xffffffffL) | ((long)branch & 0xffff00000000L); 133 long pc_page = (long)branch >> 12; 134 long adr_page = (long)dest >> 12; 135 offset = adr_page - pc_page; 136 instructions = 2; 137 } 138 } 139 int offset_lo = offset & 3; 140 offset >>= 2; 141 Instruction_aarch64::spatch(branch, 23, 5, offset); 142 Instruction_aarch64::patch(branch, 30, 29, offset_lo); 143 } else if (Instruction_aarch64::extract(insn, 31, 21) == 0b11010010100) { 144 u_int64_t dest = (u_int64_t)target; 145 // Move wide constant 146 assert(nativeInstruction_at(branch+4)->is_movk(), "wrong insns in patch"); 147 assert(nativeInstruction_at(branch+8)->is_movk(), "wrong insns in patch"); 148 Instruction_aarch64::patch(branch, 20, 5, dest & 0xffff); 149 Instruction_aarch64::patch(branch+4, 20, 5, (dest >>= 16) & 0xffff); 150 Instruction_aarch64::patch(branch+8, 20, 5, (dest >>= 16) & 0xffff); 151 assert(target_addr_for_insn(branch) == target, "should be"); 152 instructions = 3; 153 } else if (Instruction_aarch64::extract(insn, 31, 22) == 0b1011100101 && 154 Instruction_aarch64::extract(insn, 4, 0) == 0b11111) { 155 // nothing to do 156 assert(target == 0, "did not expect to relocate target for polling page load"); 157 } else { 158 ShouldNotReachHere(); 159 } 160 return instructions * NativeInstruction::instruction_size; 161 } 162 163 int MacroAssembler::patch_oop(address insn_addr, address o) { 164 int instructions; 165 unsigned insn = *(unsigned*)insn_addr; 166 assert(nativeInstruction_at(insn_addr+4)->is_movk(), "wrong insns in patch"); 167 168 // OOPs are either narrow (32 bits) or wide (48 bits). We encode 169 // narrow OOPs by setting the upper 16 bits in the first 170 // instruction. 171 if (Instruction_aarch64::extract(insn, 31, 21) == 0b11010010101) { 172 // Move narrow OOP 173 narrowOop n = oopDesc::encode_heap_oop((oop)o); 174 Instruction_aarch64::patch(insn_addr, 20, 5, n >> 16); 175 Instruction_aarch64::patch(insn_addr+4, 20, 5, n & 0xffff); 176 instructions = 2; 177 } else { 178 // Move wide OOP 179 assert(nativeInstruction_at(insn_addr+8)->is_movk(), "wrong insns in patch"); 180 uintptr_t dest = (uintptr_t)o; 181 Instruction_aarch64::patch(insn_addr, 20, 5, dest & 0xffff); 182 Instruction_aarch64::patch(insn_addr+4, 20, 5, (dest >>= 16) & 0xffff); 183 Instruction_aarch64::patch(insn_addr+8, 20, 5, (dest >>= 16) & 0xffff); 184 instructions = 3; 185 } 186 return instructions * NativeInstruction::instruction_size; 187 } 188 189 int MacroAssembler::patch_narrow_klass(address insn_addr, narrowKlass n) { 190 // Metatdata pointers are either narrow (32 bits) or wide (48 bits). 191 // We encode narrow ones by setting the upper 16 bits in the first 192 // instruction. 193 NativeInstruction *insn = nativeInstruction_at(insn_addr); 194 assert(Instruction_aarch64::extract(insn->encoding(), 31, 21) == 0b11010010101 && 195 nativeInstruction_at(insn_addr+4)->is_movk(), "wrong insns in patch"); 196 197 Instruction_aarch64::patch(insn_addr, 20, 5, n >> 16); 198 Instruction_aarch64::patch(insn_addr+4, 20, 5, n & 0xffff); 199 return 2 * NativeInstruction::instruction_size; 200 } 201 202 address MacroAssembler::target_addr_for_insn(address insn_addr, unsigned insn) { 203 long offset = 0; 204 if ((Instruction_aarch64::extract(insn, 29, 24) & 0b011011) == 0b00011000) { 205 // Load register (literal) 206 offset = Instruction_aarch64::sextract(insn, 23, 5); 207 return address(((uint64_t)insn_addr + (offset << 2))); 208 } else if (Instruction_aarch64::extract(insn, 30, 26) == 0b00101) { 209 // Unconditional branch (immediate) 210 offset = Instruction_aarch64::sextract(insn, 25, 0); 211 } else if (Instruction_aarch64::extract(insn, 31, 25) == 0b0101010) { 212 // Conditional branch (immediate) 213 offset = Instruction_aarch64::sextract(insn, 23, 5); 214 } else if (Instruction_aarch64::extract(insn, 30, 25) == 0b011010) { 215 // Compare & branch (immediate) 216 offset = Instruction_aarch64::sextract(insn, 23, 5); 217 } else if (Instruction_aarch64::extract(insn, 30, 25) == 0b011011) { 218 // Test & branch (immediate) 219 offset = Instruction_aarch64::sextract(insn, 18, 5); 220 } else if (Instruction_aarch64::extract(insn, 28, 24) == 0b10000) { 221 // PC-rel. addressing 222 offset = Instruction_aarch64::extract(insn, 30, 29); 223 offset |= Instruction_aarch64::sextract(insn, 23, 5) << 2; 224 int shift = Instruction_aarch64::extract(insn, 31, 31) ? 12 : 0; 225 if (shift) { 226 offset <<= shift; 227 uint64_t target_page = ((uint64_t)insn_addr) + offset; 228 target_page &= ((uint64_t)-1) << shift; 229 // Return the target address for the following sequences 230 // 1 - adrp Rx, target_page 231 // ldr/str Ry, [Rx, #offset_in_page] 232 // 2 - adrp Rx, target_page 233 // add Ry, Rx, #offset_in_page 234 // 3 - adrp Rx, target_page (page aligned reloc, offset == 0) 235 // movk Rx, #imm12<<32 236 // 4 - adrp Rx, target_page (page aligned reloc, offset == 0) 237 // 238 // In the first two cases we check that the register is the same and 239 // return the target_page + the offset within the page. 240 // Otherwise we assume it is a page aligned relocation and return 241 // the target page only. 242 // 243 unsigned insn2 = ((unsigned*)insn_addr)[1]; 244 if (Instruction_aarch64::extract(insn2, 29, 24) == 0b111001 && 245 Instruction_aarch64::extract(insn, 4, 0) == 246 Instruction_aarch64::extract(insn2, 9, 5)) { 247 // Load/store register (unsigned immediate) 248 unsigned int byte_offset = Instruction_aarch64::extract(insn2, 21, 10); 249 unsigned int size = Instruction_aarch64::extract(insn2, 31, 30); 250 return address(target_page + (byte_offset << size)); 251 } else if (Instruction_aarch64::extract(insn2, 31, 22) == 0b1001000100 && 252 Instruction_aarch64::extract(insn, 4, 0) == 253 Instruction_aarch64::extract(insn2, 4, 0)) { 254 // add (immediate) 255 unsigned int byte_offset = Instruction_aarch64::extract(insn2, 21, 10); 256 return address(target_page + byte_offset); 257 } else { 258 if (Instruction_aarch64::extract(insn2, 31, 21) == 0b11110010110 && 259 Instruction_aarch64::extract(insn, 4, 0) == 260 Instruction_aarch64::extract(insn2, 4, 0)) { 261 target_page = (target_page & 0xffffffff) | 262 ((uint64_t)Instruction_aarch64::extract(insn2, 20, 5) << 32); 263 } 264 return (address)target_page; 265 } 266 } else { 267 ShouldNotReachHere(); 268 } 269 } else if (Instruction_aarch64::extract(insn, 31, 23) == 0b110100101) { 270 u_int32_t *insns = (u_int32_t *)insn_addr; 271 // Move wide constant: movz, movk, movk. See movptr(). 272 assert(nativeInstruction_at(insns+1)->is_movk(), "wrong insns in patch"); 273 assert(nativeInstruction_at(insns+2)->is_movk(), "wrong insns in patch"); 274 return address(u_int64_t(Instruction_aarch64::extract(insns[0], 20, 5)) 275 + (u_int64_t(Instruction_aarch64::extract(insns[1], 20, 5)) << 16) 276 + (u_int64_t(Instruction_aarch64::extract(insns[2], 20, 5)) << 32)); 277 } else if (Instruction_aarch64::extract(insn, 31, 22) == 0b1011100101 && 278 Instruction_aarch64::extract(insn, 4, 0) == 0b11111) { 279 return 0; 280 } else { 281 ShouldNotReachHere(); 282 } 283 return address(((uint64_t)insn_addr + (offset << 2))); 284 } 285 286 void MacroAssembler::serialize_memory(Register thread, Register tmp) { 287 dsb(Assembler::SY); 288 } 289 290 291 void MacroAssembler::reset_last_Java_frame(bool clear_fp) { 292 // we must set sp to zero to clear frame 293 str(zr, Address(rthread, JavaThread::last_Java_sp_offset())); 294 295 // must clear fp, so that compiled frames are not confused; it is 296 // possible that we need it only for debugging 297 if (clear_fp) { 298 str(zr, Address(rthread, JavaThread::last_Java_fp_offset())); 299 } 300 301 // Always clear the pc because it could have been set by make_walkable() 302 str(zr, Address(rthread, JavaThread::last_Java_pc_offset())); 303 } 304 305 // Calls to C land 306 // 307 // When entering C land, the rfp, & resp of the last Java frame have to be recorded 308 // in the (thread-local) JavaThread object. When leaving C land, the last Java fp 309 // has to be reset to 0. This is required to allow proper stack traversal. 310 void MacroAssembler::set_last_Java_frame(Register last_java_sp, 311 Register last_java_fp, 312 Register last_java_pc, 313 Register scratch) { 314 315 if (last_java_pc->is_valid()) { 316 str(last_java_pc, Address(rthread, 317 JavaThread::frame_anchor_offset() 318 + JavaFrameAnchor::last_Java_pc_offset())); 319 } 320 321 // determine last_java_sp register 322 if (last_java_sp == sp) { 323 mov(scratch, sp); 324 last_java_sp = scratch; 325 } else if (!last_java_sp->is_valid()) { 326 last_java_sp = esp; 327 } 328 329 str(last_java_sp, Address(rthread, JavaThread::last_Java_sp_offset())); 330 331 // last_java_fp is optional 332 if (last_java_fp->is_valid()) { 333 str(last_java_fp, Address(rthread, JavaThread::last_Java_fp_offset())); 334 } 335 } 336 337 void MacroAssembler::set_last_Java_frame(Register last_java_sp, 338 Register last_java_fp, 339 address last_java_pc, 340 Register scratch) { 341 if (last_java_pc != NULL) { 342 adr(scratch, last_java_pc); 343 } else { 344 // FIXME: This is almost never correct. We should delete all 345 // cases of set_last_Java_frame with last_java_pc=NULL and use the 346 // correct return address instead. 347 adr(scratch, pc()); 348 } 349 350 str(scratch, Address(rthread, 351 JavaThread::frame_anchor_offset() 352 + JavaFrameAnchor::last_Java_pc_offset())); 353 354 set_last_Java_frame(last_java_sp, last_java_fp, noreg, scratch); 355 } 356 357 void MacroAssembler::set_last_Java_frame(Register last_java_sp, 358 Register last_java_fp, 359 Label &L, 360 Register scratch) { 361 if (L.is_bound()) { 362 set_last_Java_frame(last_java_sp, last_java_fp, target(L), scratch); 363 } else { 364 InstructionMark im(this); 365 L.add_patch_at(code(), locator()); 366 set_last_Java_frame(last_java_sp, last_java_fp, (address)NULL, scratch); 367 } 368 } 369 370 void MacroAssembler::far_call(Address entry, CodeBuffer *cbuf, Register tmp) { 371 assert(ReservedCodeCacheSize < 4*G, "branch out of range"); 372 assert(CodeCache::find_blob(entry.target()) != NULL, 373 "destination of far call not found in code cache"); 374 if (far_branches()) { 375 unsigned long offset; 376 // We can use ADRP here because we know that the total size of 377 // the code cache cannot exceed 2Gb. 378 adrp(tmp, entry, offset); 379 add(tmp, tmp, offset); 380 if (cbuf) cbuf->set_insts_mark(); 381 blr(tmp); 382 } else { 383 if (cbuf) cbuf->set_insts_mark(); 384 bl(entry); 385 } 386 } 387 388 void MacroAssembler::far_jump(Address entry, CodeBuffer *cbuf, Register tmp) { 389 assert(ReservedCodeCacheSize < 4*G, "branch out of range"); 390 assert(CodeCache::find_blob(entry.target()) != NULL, 391 "destination of far call not found in code cache"); 392 if (far_branches()) { 393 unsigned long offset; 394 // We can use ADRP here because we know that the total size of 395 // the code cache cannot exceed 2Gb. 396 adrp(tmp, entry, offset); 397 add(tmp, tmp, offset); 398 if (cbuf) cbuf->set_insts_mark(); 399 br(tmp); 400 } else { 401 if (cbuf) cbuf->set_insts_mark(); 402 b(entry); 403 } 404 } 405 406 void MacroAssembler::reserved_stack_check() { 407 // testing if reserved zone needs to be enabled 408 Label no_reserved_zone_enabling; 409 410 ldr(rscratch1, Address(rthread, JavaThread::reserved_stack_activation_offset())); 411 cmp(sp, rscratch1); 412 br(Assembler::LO, no_reserved_zone_enabling); 413 414 enter(); // LR and FP are live. 415 lea(rscratch1, CAST_FROM_FN_PTR(address, SharedRuntime::enable_stack_reserved_zone)); 416 mov(c_rarg0, rthread); 417 blr(rscratch1); 418 leave(); 419 420 // We have already removed our own frame. 421 // throw_delayed_StackOverflowError will think that it's been 422 // called by our caller. 423 lea(rscratch1, RuntimeAddress(StubRoutines::throw_delayed_StackOverflowError_entry())); 424 br(rscratch1); 425 should_not_reach_here(); 426 427 bind(no_reserved_zone_enabling); 428 } 429 430 int MacroAssembler::biased_locking_enter(Register lock_reg, 431 Register obj_reg, 432 Register swap_reg, 433 Register tmp_reg, 434 bool swap_reg_contains_mark, 435 Label& done, 436 Label* slow_case, 437 BiasedLockingCounters* counters) { 438 assert(UseBiasedLocking, "why call this otherwise?"); 439 assert_different_registers(lock_reg, obj_reg, swap_reg); 440 441 if (PrintBiasedLockingStatistics && counters == NULL) 442 counters = BiasedLocking::counters(); 443 444 assert_different_registers(lock_reg, obj_reg, swap_reg, tmp_reg, rscratch1, rscratch2, noreg); 445 assert(markOopDesc::age_shift == markOopDesc::lock_bits + markOopDesc::biased_lock_bits, "biased locking makes assumptions about bit layout"); 446 Address mark_addr (obj_reg, oopDesc::mark_offset_in_bytes()); 447 Address klass_addr (obj_reg, oopDesc::klass_offset_in_bytes()); 448 Address saved_mark_addr(lock_reg, 0); 449 450 // Biased locking 451 // See whether the lock is currently biased toward our thread and 452 // whether the epoch is still valid 453 // Note that the runtime guarantees sufficient alignment of JavaThread 454 // pointers to allow age to be placed into low bits 455 // First check to see whether biasing is even enabled for this object 456 Label cas_label; 457 int null_check_offset = -1; 458 if (!swap_reg_contains_mark) { 459 null_check_offset = offset(); 460 ldr(swap_reg, mark_addr); 461 } 462 andr(tmp_reg, swap_reg, markOopDesc::biased_lock_mask_in_place); 463 cmp(tmp_reg, markOopDesc::biased_lock_pattern); 464 br(Assembler::NE, cas_label); 465 // The bias pattern is present in the object's header. Need to check 466 // whether the bias owner and the epoch are both still current. 467 load_prototype_header(tmp_reg, obj_reg); 468 orr(tmp_reg, tmp_reg, rthread); 469 eor(tmp_reg, swap_reg, tmp_reg); 470 andr(tmp_reg, tmp_reg, ~((int) markOopDesc::age_mask_in_place)); 471 if (counters != NULL) { 472 Label around; 473 cbnz(tmp_reg, around); 474 atomic_incw(Address((address)counters->biased_lock_entry_count_addr()), tmp_reg, rscratch1, rscratch2); 475 b(done); 476 bind(around); 477 } else { 478 cbz(tmp_reg, done); 479 } 480 481 Label try_revoke_bias; 482 Label try_rebias; 483 484 // At this point we know that the header has the bias pattern and 485 // that we are not the bias owner in the current epoch. We need to 486 // figure out more details about the state of the header in order to 487 // know what operations can be legally performed on the object's 488 // header. 489 490 // If the low three bits in the xor result aren't clear, that means 491 // the prototype header is no longer biased and we have to revoke 492 // the bias on this object. 493 andr(rscratch1, tmp_reg, markOopDesc::biased_lock_mask_in_place); 494 cbnz(rscratch1, try_revoke_bias); 495 496 // Biasing is still enabled for this data type. See whether the 497 // epoch of the current bias is still valid, meaning that the epoch 498 // bits of the mark word are equal to the epoch bits of the 499 // prototype header. (Note that the prototype header's epoch bits 500 // only change at a safepoint.) If not, attempt to rebias the object 501 // toward the current thread. Note that we must be absolutely sure 502 // that the current epoch is invalid in order to do this because 503 // otherwise the manipulations it performs on the mark word are 504 // illegal. 505 andr(rscratch1, tmp_reg, markOopDesc::epoch_mask_in_place); 506 cbnz(rscratch1, try_rebias); 507 508 // The epoch of the current bias is still valid but we know nothing 509 // about the owner; it might be set or it might be clear. Try to 510 // acquire the bias of the object using an atomic operation. If this 511 // fails we will go in to the runtime to revoke the object's bias. 512 // Note that we first construct the presumed unbiased header so we 513 // don't accidentally blow away another thread's valid bias. 514 { 515 Label here; 516 mov(rscratch1, markOopDesc::biased_lock_mask_in_place | markOopDesc::age_mask_in_place | markOopDesc::epoch_mask_in_place); 517 andr(swap_reg, swap_reg, rscratch1); 518 orr(tmp_reg, swap_reg, rthread); 519 cmpxchg_obj_header(swap_reg, tmp_reg, obj_reg, rscratch1, here, slow_case); 520 // If the biasing toward our thread failed, this means that 521 // another thread succeeded in biasing it toward itself and we 522 // need to revoke that bias. The revocation will occur in the 523 // interpreter runtime in the slow case. 524 bind(here); 525 if (counters != NULL) { 526 atomic_incw(Address((address)counters->anonymously_biased_lock_entry_count_addr()), 527 tmp_reg, rscratch1, rscratch2); 528 } 529 } 530 b(done); 531 532 bind(try_rebias); 533 // At this point we know the epoch has expired, meaning that the 534 // current "bias owner", if any, is actually invalid. Under these 535 // circumstances _only_, we are allowed to use the current header's 536 // value as the comparison value when doing the cas to acquire the 537 // bias in the current epoch. In other words, we allow transfer of 538 // the bias from one thread to another directly in this situation. 539 // 540 // FIXME: due to a lack of registers we currently blow away the age 541 // bits in this situation. Should attempt to preserve them. 542 { 543 Label here; 544 load_prototype_header(tmp_reg, obj_reg); 545 orr(tmp_reg, rthread, tmp_reg); 546 cmpxchg_obj_header(swap_reg, tmp_reg, obj_reg, rscratch1, here, slow_case); 547 // If the biasing toward our thread failed, then another thread 548 // succeeded in biasing it toward itself and we need to revoke that 549 // bias. The revocation will occur in the runtime in the slow case. 550 bind(here); 551 if (counters != NULL) { 552 atomic_incw(Address((address)counters->rebiased_lock_entry_count_addr()), 553 tmp_reg, rscratch1, rscratch2); 554 } 555 } 556 b(done); 557 558 bind(try_revoke_bias); 559 // The prototype mark in the klass doesn't have the bias bit set any 560 // more, indicating that objects of this data type are not supposed 561 // to be biased any more. We are going to try to reset the mark of 562 // this object to the prototype value and fall through to the 563 // CAS-based locking scheme. Note that if our CAS fails, it means 564 // that another thread raced us for the privilege of revoking the 565 // bias of this particular object, so it's okay to continue in the 566 // normal locking code. 567 // 568 // FIXME: due to a lack of registers we currently blow away the age 569 // bits in this situation. Should attempt to preserve them. 570 { 571 Label here, nope; 572 load_prototype_header(tmp_reg, obj_reg); 573 cmpxchg_obj_header(swap_reg, tmp_reg, obj_reg, rscratch1, here, &nope); 574 bind(here); 575 576 // Fall through to the normal CAS-based lock, because no matter what 577 // the result of the above CAS, some thread must have succeeded in 578 // removing the bias bit from the object's header. 579 if (counters != NULL) { 580 atomic_incw(Address((address)counters->revoked_lock_entry_count_addr()), tmp_reg, 581 rscratch1, rscratch2); 582 } 583 bind(nope); 584 } 585 586 bind(cas_label); 587 588 return null_check_offset; 589 } 590 591 void MacroAssembler::biased_locking_exit(Register obj_reg, Register temp_reg, Label& done) { 592 assert(UseBiasedLocking, "why call this otherwise?"); 593 594 // Check for biased locking unlock case, which is a no-op 595 // Note: we do not have to check the thread ID for two reasons. 596 // First, the interpreter checks for IllegalMonitorStateException at 597 // a higher level. Second, if the bias was revoked while we held the 598 // lock, the object could not be rebiased toward another thread, so 599 // the bias bit would be clear. 600 ldr(temp_reg, Address(obj_reg, oopDesc::mark_offset_in_bytes())); 601 andr(temp_reg, temp_reg, markOopDesc::biased_lock_mask_in_place); 602 cmp(temp_reg, markOopDesc::biased_lock_pattern); 603 br(Assembler::EQ, done); 604 } 605 606 static void pass_arg0(MacroAssembler* masm, Register arg) { 607 if (c_rarg0 != arg ) { 608 masm->mov(c_rarg0, arg); 609 } 610 } 611 612 static void pass_arg1(MacroAssembler* masm, Register arg) { 613 if (c_rarg1 != arg ) { 614 masm->mov(c_rarg1, arg); 615 } 616 } 617 618 static void pass_arg2(MacroAssembler* masm, Register arg) { 619 if (c_rarg2 != arg ) { 620 masm->mov(c_rarg2, arg); 621 } 622 } 623 624 static void pass_arg3(MacroAssembler* masm, Register arg) { 625 if (c_rarg3 != arg ) { 626 masm->mov(c_rarg3, arg); 627 } 628 } 629 630 void MacroAssembler::call_VM_base(Register oop_result, 631 Register java_thread, 632 Register last_java_sp, 633 address entry_point, 634 int number_of_arguments, 635 bool check_exceptions) { 636 // determine java_thread register 637 if (!java_thread->is_valid()) { 638 java_thread = rthread; 639 } 640 641 // determine last_java_sp register 642 if (!last_java_sp->is_valid()) { 643 last_java_sp = esp; 644 } 645 646 // debugging support 647 assert(number_of_arguments >= 0 , "cannot have negative number of arguments"); 648 assert(java_thread == rthread, "unexpected register"); 649 #ifdef ASSERT 650 // TraceBytecodes does not use r12 but saves it over the call, so don't verify 651 // if ((UseCompressedOops || UseCompressedClassPointers) && !TraceBytecodes) verify_heapbase("call_VM_base: heap base corrupted?"); 652 #endif // ASSERT 653 654 assert(java_thread != oop_result , "cannot use the same register for java_thread & oop_result"); 655 assert(java_thread != last_java_sp, "cannot use the same register for java_thread & last_java_sp"); 656 657 // push java thread (becomes first argument of C function) 658 659 mov(c_rarg0, java_thread); 660 661 // set last Java frame before call 662 assert(last_java_sp != rfp, "can't use rfp"); 663 664 Label l; 665 set_last_Java_frame(last_java_sp, rfp, l, rscratch1); 666 667 // do the call, remove parameters 668 MacroAssembler::call_VM_leaf_base(entry_point, number_of_arguments, &l); 669 670 // reset last Java frame 671 // Only interpreter should have to clear fp 672 reset_last_Java_frame(true); 673 674 // C++ interp handles this in the interpreter 675 check_and_handle_popframe(java_thread); 676 check_and_handle_earlyret(java_thread); 677 678 if (check_exceptions) { 679 // check for pending exceptions (java_thread is set upon return) 680 ldr(rscratch1, Address(java_thread, in_bytes(Thread::pending_exception_offset()))); 681 Label ok; 682 cbz(rscratch1, ok); 683 lea(rscratch1, RuntimeAddress(StubRoutines::forward_exception_entry())); 684 br(rscratch1); 685 bind(ok); 686 } 687 688 // get oop result if there is one and reset the value in the thread 689 if (oop_result->is_valid()) { 690 get_vm_result(oop_result, java_thread); 691 } 692 } 693 694 void MacroAssembler::call_VM_helper(Register oop_result, address entry_point, int number_of_arguments, bool check_exceptions) { 695 call_VM_base(oop_result, noreg, noreg, entry_point, number_of_arguments, check_exceptions); 696 } 697 698 // Maybe emit a call via a trampoline. If the code cache is small 699 // trampolines won't be emitted. 700 701 address MacroAssembler::trampoline_call(Address entry, CodeBuffer *cbuf) { 702 assert(JavaThread::current()->is_Compiler_thread(), "just checking"); 703 assert(entry.rspec().type() == relocInfo::runtime_call_type 704 || entry.rspec().type() == relocInfo::opt_virtual_call_type 705 || entry.rspec().type() == relocInfo::static_call_type 706 || entry.rspec().type() == relocInfo::virtual_call_type, "wrong reloc type"); 707 708 unsigned int start_offset = offset(); 709 if (far_branches() && !Compile::current()->in_scratch_emit_size()) { 710 address stub = emit_trampoline_stub(start_offset, entry.target()); 711 if (stub == NULL) { 712 return NULL; // CodeCache is full 713 } 714 } 715 716 if (cbuf) cbuf->set_insts_mark(); 717 relocate(entry.rspec()); 718 if (!far_branches()) { 719 bl(entry.target()); 720 } else { 721 bl(pc()); 722 } 723 // just need to return a non-null address 724 return pc(); 725 } 726 727 728 // Emit a trampoline stub for a call to a target which is too far away. 729 // 730 // code sequences: 731 // 732 // call-site: 733 // branch-and-link to <destination> or <trampoline stub> 734 // 735 // Related trampoline stub for this call site in the stub section: 736 // load the call target from the constant pool 737 // branch (LR still points to the call site above) 738 739 address MacroAssembler::emit_trampoline_stub(int insts_call_instruction_offset, 740 address dest) { 741 address stub = start_a_stub(Compile::MAX_stubs_size/2); 742 if (stub == NULL) { 743 return NULL; // CodeBuffer::expand failed 744 } 745 746 // Create a trampoline stub relocation which relates this trampoline stub 747 // with the call instruction at insts_call_instruction_offset in the 748 // instructions code-section. 749 align(wordSize); 750 relocate(trampoline_stub_Relocation::spec(code()->insts()->start() 751 + insts_call_instruction_offset)); 752 const int stub_start_offset = offset(); 753 754 // Now, create the trampoline stub's code: 755 // - load the call 756 // - call 757 Label target; 758 ldr(rscratch1, target); 759 br(rscratch1); 760 bind(target); 761 assert(offset() - stub_start_offset == NativeCallTrampolineStub::data_offset, 762 "should be"); 763 emit_int64((int64_t)dest); 764 765 const address stub_start_addr = addr_at(stub_start_offset); 766 767 assert(is_NativeCallTrampolineStub_at(stub_start_addr), "doesn't look like a trampoline"); 768 769 end_a_stub(); 770 return stub; 771 } 772 773 address MacroAssembler::ic_call(address entry, jint method_index) { 774 RelocationHolder rh = virtual_call_Relocation::spec(pc(), method_index); 775 // address const_ptr = long_constant((jlong)Universe::non_oop_word()); 776 // unsigned long offset; 777 // ldr_constant(rscratch2, const_ptr); 778 movptr(rscratch2, (uintptr_t)Universe::non_oop_word()); 779 return trampoline_call(Address(entry, rh)); 780 } 781 782 // Implementation of call_VM versions 783 784 void MacroAssembler::call_VM(Register oop_result, 785 address entry_point, 786 bool check_exceptions) { 787 call_VM_helper(oop_result, entry_point, 0, check_exceptions); 788 } 789 790 void MacroAssembler::call_VM(Register oop_result, 791 address entry_point, 792 Register arg_1, 793 bool check_exceptions) { 794 pass_arg1(this, arg_1); 795 call_VM_helper(oop_result, entry_point, 1, check_exceptions); 796 } 797 798 void MacroAssembler::call_VM(Register oop_result, 799 address entry_point, 800 Register arg_1, 801 Register arg_2, 802 bool check_exceptions) { 803 assert(arg_1 != c_rarg2, "smashed arg"); 804 pass_arg2(this, arg_2); 805 pass_arg1(this, arg_1); 806 call_VM_helper(oop_result, entry_point, 2, check_exceptions); 807 } 808 809 void MacroAssembler::call_VM(Register oop_result, 810 address entry_point, 811 Register arg_1, 812 Register arg_2, 813 Register arg_3, 814 bool check_exceptions) { 815 assert(arg_1 != c_rarg3, "smashed arg"); 816 assert(arg_2 != c_rarg3, "smashed arg"); 817 pass_arg3(this, arg_3); 818 819 assert(arg_1 != c_rarg2, "smashed arg"); 820 pass_arg2(this, arg_2); 821 822 pass_arg1(this, arg_1); 823 call_VM_helper(oop_result, entry_point, 3, check_exceptions); 824 } 825 826 void MacroAssembler::call_VM(Register oop_result, 827 Register last_java_sp, 828 address entry_point, 829 int number_of_arguments, 830 bool check_exceptions) { 831 call_VM_base(oop_result, rthread, last_java_sp, entry_point, number_of_arguments, check_exceptions); 832 } 833 834 void MacroAssembler::call_VM(Register oop_result, 835 Register last_java_sp, 836 address entry_point, 837 Register arg_1, 838 bool check_exceptions) { 839 pass_arg1(this, arg_1); 840 call_VM(oop_result, last_java_sp, entry_point, 1, check_exceptions); 841 } 842 843 void MacroAssembler::call_VM(Register oop_result, 844 Register last_java_sp, 845 address entry_point, 846 Register arg_1, 847 Register arg_2, 848 bool check_exceptions) { 849 850 assert(arg_1 != c_rarg2, "smashed arg"); 851 pass_arg2(this, arg_2); 852 pass_arg1(this, arg_1); 853 call_VM(oop_result, last_java_sp, entry_point, 2, check_exceptions); 854 } 855 856 void MacroAssembler::call_VM(Register oop_result, 857 Register last_java_sp, 858 address entry_point, 859 Register arg_1, 860 Register arg_2, 861 Register arg_3, 862 bool check_exceptions) { 863 assert(arg_1 != c_rarg3, "smashed arg"); 864 assert(arg_2 != c_rarg3, "smashed arg"); 865 pass_arg3(this, arg_3); 866 assert(arg_1 != c_rarg2, "smashed arg"); 867 pass_arg2(this, arg_2); 868 pass_arg1(this, arg_1); 869 call_VM(oop_result, last_java_sp, entry_point, 3, check_exceptions); 870 } 871 872 873 void MacroAssembler::get_vm_result(Register oop_result, Register java_thread) { 874 ldr(oop_result, Address(java_thread, JavaThread::vm_result_offset())); 875 str(zr, Address(java_thread, JavaThread::vm_result_offset())); 876 verify_oop(oop_result, "broken oop in call_VM_base"); 877 } 878 879 void MacroAssembler::get_vm_result_2(Register metadata_result, Register java_thread) { 880 ldr(metadata_result, Address(java_thread, JavaThread::vm_result_2_offset())); 881 str(zr, Address(java_thread, JavaThread::vm_result_2_offset())); 882 } 883 884 void MacroAssembler::align(int modulus) { 885 while (offset() % modulus != 0) nop(); 886 } 887 888 // these are no-ops overridden by InterpreterMacroAssembler 889 890 void MacroAssembler::check_and_handle_earlyret(Register java_thread) { } 891 892 void MacroAssembler::check_and_handle_popframe(Register java_thread) { } 893 894 895 RegisterOrConstant MacroAssembler::delayed_value_impl(intptr_t* delayed_value_addr, 896 Register tmp, 897 int offset) { 898 intptr_t value = *delayed_value_addr; 899 if (value != 0) 900 return RegisterOrConstant(value + offset); 901 902 // load indirectly to solve generation ordering problem 903 ldr(tmp, ExternalAddress((address) delayed_value_addr)); 904 905 if (offset != 0) 906 add(tmp, tmp, offset); 907 908 return RegisterOrConstant(tmp); 909 } 910 911 912 void MacroAssembler:: notify(int type) { 913 if (type == bytecode_start) { 914 // set_last_Java_frame(esp, rfp, (address)NULL); 915 Assembler:: notify(type); 916 // reset_last_Java_frame(true); 917 } 918 else 919 Assembler:: notify(type); 920 } 921 922 // Look up the method for a megamorphic invokeinterface call. 923 // The target method is determined by <intf_klass, itable_index>. 924 // The receiver klass is in recv_klass. 925 // On success, the result will be in method_result, and execution falls through. 926 // On failure, execution transfers to the given label. 927 void MacroAssembler::lookup_interface_method(Register recv_klass, 928 Register intf_klass, 929 RegisterOrConstant itable_index, 930 Register method_result, 931 Register scan_temp, 932 Label& L_no_such_interface) { 933 assert_different_registers(recv_klass, intf_klass, method_result, scan_temp); 934 assert(itable_index.is_constant() || itable_index.as_register() == method_result, 935 "caller must use same register for non-constant itable index as for method"); 936 937 // Compute start of first itableOffsetEntry (which is at the end of the vtable) 938 int vtable_base = in_bytes(Klass::vtable_start_offset()); 939 int itentry_off = itableMethodEntry::method_offset_in_bytes(); 940 int scan_step = itableOffsetEntry::size() * wordSize; 941 int vte_size = vtableEntry::size_in_bytes(); 942 assert(vte_size == wordSize, "else adjust times_vte_scale"); 943 944 ldrw(scan_temp, Address(recv_klass, Klass::vtable_length_offset())); 945 946 // %%% Could store the aligned, prescaled offset in the klassoop. 947 // lea(scan_temp, Address(recv_klass, scan_temp, times_vte_scale, vtable_base)); 948 lea(scan_temp, Address(recv_klass, scan_temp, Address::lsl(3))); 949 add(scan_temp, scan_temp, vtable_base); 950 951 // Adjust recv_klass by scaled itable_index, so we can free itable_index. 952 assert(itableMethodEntry::size() * wordSize == wordSize, "adjust the scaling in the code below"); 953 // lea(recv_klass, Address(recv_klass, itable_index, Address::times_ptr, itentry_off)); 954 lea(recv_klass, Address(recv_klass, itable_index, Address::lsl(3))); 955 if (itentry_off) 956 add(recv_klass, recv_klass, itentry_off); 957 958 // for (scan = klass->itable(); scan->interface() != NULL; scan += scan_step) { 959 // if (scan->interface() == intf) { 960 // result = (klass + scan->offset() + itable_index); 961 // } 962 // } 963 Label search, found_method; 964 965 for (int peel = 1; peel >= 0; peel--) { 966 ldr(method_result, Address(scan_temp, itableOffsetEntry::interface_offset_in_bytes())); 967 cmp(intf_klass, method_result); 968 969 if (peel) { 970 br(Assembler::EQ, found_method); 971 } else { 972 br(Assembler::NE, search); 973 // (invert the test to fall through to found_method...) 974 } 975 976 if (!peel) break; 977 978 bind(search); 979 980 // Check that the previous entry is non-null. A null entry means that 981 // the receiver class doesn't implement the interface, and wasn't the 982 // same as when the caller was compiled. 983 cbz(method_result, L_no_such_interface); 984 add(scan_temp, scan_temp, scan_step); 985 } 986 987 bind(found_method); 988 989 // Got a hit. 990 ldr(scan_temp, Address(scan_temp, itableOffsetEntry::offset_offset_in_bytes())); 991 ldr(method_result, Address(recv_klass, scan_temp)); 992 } 993 994 // virtual method calling 995 void MacroAssembler::lookup_virtual_method(Register recv_klass, 996 RegisterOrConstant vtable_index, 997 Register method_result) { 998 const int base = in_bytes(Klass::vtable_start_offset()); 999 assert(vtableEntry::size() * wordSize == 8, 1000 "adjust the scaling in the code below"); 1001 int vtable_offset_in_bytes = base + vtableEntry::method_offset_in_bytes(); 1002 1003 if (vtable_index.is_register()) { 1004 lea(method_result, Address(recv_klass, 1005 vtable_index.as_register(), 1006 Address::lsl(LogBytesPerWord))); 1007 ldr(method_result, Address(method_result, vtable_offset_in_bytes)); 1008 } else { 1009 vtable_offset_in_bytes += vtable_index.as_constant() * wordSize; 1010 ldr(method_result, Address(recv_klass, vtable_offset_in_bytes)); 1011 } 1012 } 1013 1014 void MacroAssembler::check_klass_subtype(Register sub_klass, 1015 Register super_klass, 1016 Register temp_reg, 1017 Label& L_success) { 1018 Label L_failure; 1019 check_klass_subtype_fast_path(sub_klass, super_klass, temp_reg, &L_success, &L_failure, NULL); 1020 check_klass_subtype_slow_path(sub_klass, super_klass, temp_reg, noreg, &L_success, NULL); 1021 bind(L_failure); 1022 } 1023 1024 1025 void MacroAssembler::check_klass_subtype_fast_path(Register sub_klass, 1026 Register super_klass, 1027 Register temp_reg, 1028 Label* L_success, 1029 Label* L_failure, 1030 Label* L_slow_path, 1031 RegisterOrConstant super_check_offset) { 1032 assert_different_registers(sub_klass, super_klass, temp_reg); 1033 bool must_load_sco = (super_check_offset.constant_or_zero() == -1); 1034 if (super_check_offset.is_register()) { 1035 assert_different_registers(sub_klass, super_klass, 1036 super_check_offset.as_register()); 1037 } else if (must_load_sco) { 1038 assert(temp_reg != noreg, "supply either a temp or a register offset"); 1039 } 1040 1041 Label L_fallthrough; 1042 int label_nulls = 0; 1043 if (L_success == NULL) { L_success = &L_fallthrough; label_nulls++; } 1044 if (L_failure == NULL) { L_failure = &L_fallthrough; label_nulls++; } 1045 if (L_slow_path == NULL) { L_slow_path = &L_fallthrough; label_nulls++; } 1046 assert(label_nulls <= 1, "at most one NULL in the batch"); 1047 1048 int sc_offset = in_bytes(Klass::secondary_super_cache_offset()); 1049 int sco_offset = in_bytes(Klass::super_check_offset_offset()); 1050 Address super_check_offset_addr(super_klass, sco_offset); 1051 1052 // Hacked jmp, which may only be used just before L_fallthrough. 1053 #define final_jmp(label) \ 1054 if (&(label) == &L_fallthrough) { /*do nothing*/ } \ 1055 else b(label) /*omit semi*/ 1056 1057 // If the pointers are equal, we are done (e.g., String[] elements). 1058 // This self-check enables sharing of secondary supertype arrays among 1059 // non-primary types such as array-of-interface. Otherwise, each such 1060 // type would need its own customized SSA. 1061 // We move this check to the front of the fast path because many 1062 // type checks are in fact trivially successful in this manner, 1063 // so we get a nicely predicted branch right at the start of the check. 1064 cmp(sub_klass, super_klass); 1065 br(Assembler::EQ, *L_success); 1066 1067 // Check the supertype display: 1068 if (must_load_sco) { 1069 ldrw(temp_reg, super_check_offset_addr); 1070 super_check_offset = RegisterOrConstant(temp_reg); 1071 } 1072 Address super_check_addr(sub_klass, super_check_offset); 1073 ldr(rscratch1, super_check_addr); 1074 cmp(super_klass, rscratch1); // load displayed supertype 1075 1076 // This check has worked decisively for primary supers. 1077 // Secondary supers are sought in the super_cache ('super_cache_addr'). 1078 // (Secondary supers are interfaces and very deeply nested subtypes.) 1079 // This works in the same check above because of a tricky aliasing 1080 // between the super_cache and the primary super display elements. 1081 // (The 'super_check_addr' can address either, as the case requires.) 1082 // Note that the cache is updated below if it does not help us find 1083 // what we need immediately. 1084 // So if it was a primary super, we can just fail immediately. 1085 // Otherwise, it's the slow path for us (no success at this point). 1086 1087 if (super_check_offset.is_register()) { 1088 br(Assembler::EQ, *L_success); 1089 cmp(super_check_offset.as_register(), sc_offset); 1090 if (L_failure == &L_fallthrough) { 1091 br(Assembler::EQ, *L_slow_path); 1092 } else { 1093 br(Assembler::NE, *L_failure); 1094 final_jmp(*L_slow_path); 1095 } 1096 } else if (super_check_offset.as_constant() == sc_offset) { 1097 // Need a slow path; fast failure is impossible. 1098 if (L_slow_path == &L_fallthrough) { 1099 br(Assembler::EQ, *L_success); 1100 } else { 1101 br(Assembler::NE, *L_slow_path); 1102 final_jmp(*L_success); 1103 } 1104 } else { 1105 // No slow path; it's a fast decision. 1106 if (L_failure == &L_fallthrough) { 1107 br(Assembler::EQ, *L_success); 1108 } else { 1109 br(Assembler::NE, *L_failure); 1110 final_jmp(*L_success); 1111 } 1112 } 1113 1114 bind(L_fallthrough); 1115 1116 #undef final_jmp 1117 } 1118 1119 // These two are taken from x86, but they look generally useful 1120 1121 // scans count pointer sized words at [addr] for occurence of value, 1122 // generic 1123 void MacroAssembler::repne_scan(Register addr, Register value, Register count, 1124 Register scratch) { 1125 Label Lloop, Lexit; 1126 cbz(count, Lexit); 1127 bind(Lloop); 1128 ldr(scratch, post(addr, wordSize)); 1129 cmp(value, scratch); 1130 br(EQ, Lexit); 1131 sub(count, count, 1); 1132 cbnz(count, Lloop); 1133 bind(Lexit); 1134 } 1135 1136 // scans count 4 byte words at [addr] for occurence of value, 1137 // generic 1138 void MacroAssembler::repne_scanw(Register addr, Register value, Register count, 1139 Register scratch) { 1140 Label Lloop, Lexit; 1141 cbz(count, Lexit); 1142 bind(Lloop); 1143 ldrw(scratch, post(addr, wordSize)); 1144 cmpw(value, scratch); 1145 br(EQ, Lexit); 1146 sub(count, count, 1); 1147 cbnz(count, Lloop); 1148 bind(Lexit); 1149 } 1150 1151 void MacroAssembler::check_klass_subtype_slow_path(Register sub_klass, 1152 Register super_klass, 1153 Register temp_reg, 1154 Register temp2_reg, 1155 Label* L_success, 1156 Label* L_failure, 1157 bool set_cond_codes) { 1158 assert_different_registers(sub_klass, super_klass, temp_reg); 1159 if (temp2_reg != noreg) 1160 assert_different_registers(sub_klass, super_klass, temp_reg, temp2_reg, rscratch1); 1161 #define IS_A_TEMP(reg) ((reg) == temp_reg || (reg) == temp2_reg) 1162 1163 Label L_fallthrough; 1164 int label_nulls = 0; 1165 if (L_success == NULL) { L_success = &L_fallthrough; label_nulls++; } 1166 if (L_failure == NULL) { L_failure = &L_fallthrough; label_nulls++; } 1167 assert(label_nulls <= 1, "at most one NULL in the batch"); 1168 1169 // a couple of useful fields in sub_klass: 1170 int ss_offset = in_bytes(Klass::secondary_supers_offset()); 1171 int sc_offset = in_bytes(Klass::secondary_super_cache_offset()); 1172 Address secondary_supers_addr(sub_klass, ss_offset); 1173 Address super_cache_addr( sub_klass, sc_offset); 1174 1175 BLOCK_COMMENT("check_klass_subtype_slow_path"); 1176 1177 // Do a linear scan of the secondary super-klass chain. 1178 // This code is rarely used, so simplicity is a virtue here. 1179 // The repne_scan instruction uses fixed registers, which we must spill. 1180 // Don't worry too much about pre-existing connections with the input regs. 1181 1182 assert(sub_klass != r0, "killed reg"); // killed by mov(r0, super) 1183 assert(sub_klass != r2, "killed reg"); // killed by lea(r2, &pst_counter) 1184 1185 // Get super_klass value into r0 (even if it was in r5 or r2). 1186 RegSet pushed_registers; 1187 if (!IS_A_TEMP(r2)) pushed_registers += r2; 1188 if (!IS_A_TEMP(r5)) pushed_registers += r5; 1189 1190 if (super_klass != r0 || UseCompressedOops) { 1191 if (!IS_A_TEMP(r0)) pushed_registers += r0; 1192 } 1193 1194 push(pushed_registers, sp); 1195 1196 #ifndef PRODUCT 1197 mov(rscratch2, (address)&SharedRuntime::_partial_subtype_ctr); 1198 Address pst_counter_addr(rscratch2); 1199 ldr(rscratch1, pst_counter_addr); 1200 add(rscratch1, rscratch1, 1); 1201 str(rscratch1, pst_counter_addr); 1202 #endif //PRODUCT 1203 1204 // We will consult the secondary-super array. 1205 ldr(r5, secondary_supers_addr); 1206 // Load the array length. 1207 ldrw(r2, Address(r5, Array<Klass*>::length_offset_in_bytes())); 1208 // Skip to start of data. 1209 add(r5, r5, Array<Klass*>::base_offset_in_bytes()); 1210 1211 cmp(sp, zr); // Clear Z flag; SP is never zero 1212 // Scan R2 words at [R5] for an occurrence of R0. 1213 // Set NZ/Z based on last compare. 1214 repne_scan(r5, r0, r2, rscratch1); 1215 1216 // Unspill the temp. registers: 1217 pop(pushed_registers, sp); 1218 1219 br(Assembler::NE, *L_failure); 1220 1221 // Success. Cache the super we found and proceed in triumph. 1222 str(super_klass, super_cache_addr); 1223 1224 if (L_success != &L_fallthrough) { 1225 b(*L_success); 1226 } 1227 1228 #undef IS_A_TEMP 1229 1230 bind(L_fallthrough); 1231 } 1232 1233 1234 void MacroAssembler::verify_oop(Register reg, const char* s) { 1235 if (!VerifyOops) return; 1236 1237 // Pass register number to verify_oop_subroutine 1238 const char* b = NULL; 1239 { 1240 ResourceMark rm; 1241 stringStream ss; 1242 ss.print("verify_oop: %s: %s", reg->name(), s); 1243 b = code_string(ss.as_string()); 1244 } 1245 BLOCK_COMMENT("verify_oop {"); 1246 1247 stp(r0, rscratch1, Address(pre(sp, -2 * wordSize))); 1248 stp(rscratch2, lr, Address(pre(sp, -2 * wordSize))); 1249 1250 mov(r0, reg); 1251 mov(rscratch1, (address)b); 1252 1253 // call indirectly to solve generation ordering problem 1254 lea(rscratch2, ExternalAddress(StubRoutines::verify_oop_subroutine_entry_address())); 1255 ldr(rscratch2, Address(rscratch2)); 1256 blr(rscratch2); 1257 1258 ldp(rscratch2, lr, Address(post(sp, 2 * wordSize))); 1259 ldp(r0, rscratch1, Address(post(sp, 2 * wordSize))); 1260 1261 BLOCK_COMMENT("} verify_oop"); 1262 } 1263 1264 void MacroAssembler::verify_oop_addr(Address addr, const char* s) { 1265 if (!VerifyOops) return; 1266 1267 const char* b = NULL; 1268 { 1269 ResourceMark rm; 1270 stringStream ss; 1271 ss.print("verify_oop_addr: %s", s); 1272 b = code_string(ss.as_string()); 1273 } 1274 BLOCK_COMMENT("verify_oop_addr {"); 1275 1276 stp(r0, rscratch1, Address(pre(sp, -2 * wordSize))); 1277 stp(rscratch2, lr, Address(pre(sp, -2 * wordSize))); 1278 1279 // addr may contain sp so we will have to adjust it based on the 1280 // pushes that we just did. 1281 if (addr.uses(sp)) { 1282 lea(r0, addr); 1283 ldr(r0, Address(r0, 4 * wordSize)); 1284 } else { 1285 ldr(r0, addr); 1286 } 1287 mov(rscratch1, (address)b); 1288 1289 // call indirectly to solve generation ordering problem 1290 lea(rscratch2, ExternalAddress(StubRoutines::verify_oop_subroutine_entry_address())); 1291 ldr(rscratch2, Address(rscratch2)); 1292 blr(rscratch2); 1293 1294 ldp(rscratch2, lr, Address(post(sp, 2 * wordSize))); 1295 ldp(r0, rscratch1, Address(post(sp, 2 * wordSize))); 1296 1297 BLOCK_COMMENT("} verify_oop_addr"); 1298 } 1299 1300 Address MacroAssembler::argument_address(RegisterOrConstant arg_slot, 1301 int extra_slot_offset) { 1302 // cf. TemplateTable::prepare_invoke(), if (load_receiver). 1303 int stackElementSize = Interpreter::stackElementSize; 1304 int offset = Interpreter::expr_offset_in_bytes(extra_slot_offset+0); 1305 #ifdef ASSERT 1306 int offset1 = Interpreter::expr_offset_in_bytes(extra_slot_offset+1); 1307 assert(offset1 - offset == stackElementSize, "correct arithmetic"); 1308 #endif 1309 if (arg_slot.is_constant()) { 1310 return Address(esp, arg_slot.as_constant() * stackElementSize 1311 + offset); 1312 } else { 1313 add(rscratch1, esp, arg_slot.as_register(), 1314 ext::uxtx, exact_log2(stackElementSize)); 1315 return Address(rscratch1, offset); 1316 } 1317 } 1318 1319 void MacroAssembler::call_VM_leaf_base(address entry_point, 1320 int number_of_arguments, 1321 Label *retaddr) { 1322 call_VM_leaf_base1(entry_point, number_of_arguments, 0, ret_type_integral, retaddr); 1323 } 1324 1325 void MacroAssembler::call_VM_leaf_base1(address entry_point, 1326 int number_of_gp_arguments, 1327 int number_of_fp_arguments, 1328 ret_type type, 1329 Label *retaddr) { 1330 Label E, L; 1331 1332 stp(rscratch1, rmethod, Address(pre(sp, -2 * wordSize))); 1333 1334 // We add 1 to number_of_arguments because the thread in arg0 is 1335 // not counted 1336 mov(rscratch1, entry_point); 1337 blrt(rscratch1, number_of_gp_arguments + 1, number_of_fp_arguments, type); 1338 if (retaddr) 1339 bind(*retaddr); 1340 1341 ldp(rscratch1, rmethod, Address(post(sp, 2 * wordSize))); 1342 maybe_isb(); 1343 } 1344 1345 void MacroAssembler::call_VM_leaf(address entry_point, int number_of_arguments) { 1346 call_VM_leaf_base(entry_point, number_of_arguments); 1347 } 1348 1349 void MacroAssembler::call_VM_leaf(address entry_point, Register arg_0) { 1350 pass_arg0(this, arg_0); 1351 call_VM_leaf_base(entry_point, 1); 1352 } 1353 1354 void MacroAssembler::call_VM_leaf(address entry_point, Register arg_0, Register arg_1) { 1355 pass_arg0(this, arg_0); 1356 pass_arg1(this, arg_1); 1357 call_VM_leaf_base(entry_point, 2); 1358 } 1359 1360 void MacroAssembler::call_VM_leaf(address entry_point, Register arg_0, 1361 Register arg_1, Register arg_2) { 1362 pass_arg0(this, arg_0); 1363 pass_arg1(this, arg_1); 1364 pass_arg2(this, arg_2); 1365 call_VM_leaf_base(entry_point, 3); 1366 } 1367 1368 void MacroAssembler::super_call_VM_leaf(address entry_point, Register arg_0) { 1369 pass_arg0(this, arg_0); 1370 MacroAssembler::call_VM_leaf_base(entry_point, 1); 1371 } 1372 1373 void MacroAssembler::super_call_VM_leaf(address entry_point, Register arg_0, Register arg_1) { 1374 1375 assert(arg_0 != c_rarg1, "smashed arg"); 1376 pass_arg1(this, arg_1); 1377 pass_arg0(this, arg_0); 1378 MacroAssembler::call_VM_leaf_base(entry_point, 2); 1379 } 1380 1381 void MacroAssembler::super_call_VM_leaf(address entry_point, Register arg_0, Register arg_1, Register arg_2) { 1382 assert(arg_0 != c_rarg2, "smashed arg"); 1383 assert(arg_1 != c_rarg2, "smashed arg"); 1384 pass_arg2(this, arg_2); 1385 assert(arg_0 != c_rarg1, "smashed arg"); 1386 pass_arg1(this, arg_1); 1387 pass_arg0(this, arg_0); 1388 MacroAssembler::call_VM_leaf_base(entry_point, 3); 1389 } 1390 1391 void MacroAssembler::super_call_VM_leaf(address entry_point, Register arg_0, Register arg_1, Register arg_2, Register arg_3) { 1392 assert(arg_0 != c_rarg3, "smashed arg"); 1393 assert(arg_1 != c_rarg3, "smashed arg"); 1394 assert(arg_2 != c_rarg3, "smashed arg"); 1395 pass_arg3(this, arg_3); 1396 assert(arg_0 != c_rarg2, "smashed arg"); 1397 assert(arg_1 != c_rarg2, "smashed arg"); 1398 pass_arg2(this, arg_2); 1399 assert(arg_0 != c_rarg1, "smashed arg"); 1400 pass_arg1(this, arg_1); 1401 pass_arg0(this, arg_0); 1402 MacroAssembler::call_VM_leaf_base(entry_point, 4); 1403 } 1404 1405 void MacroAssembler::null_check(Register reg, int offset) { 1406 if (needs_explicit_null_check(offset)) { 1407 // provoke OS NULL exception if reg = NULL by 1408 // accessing M[reg] w/o changing any registers 1409 // NOTE: this is plenty to provoke a segv 1410 ldr(zr, Address(reg)); 1411 } else { 1412 // nothing to do, (later) access of M[reg + offset] 1413 // will provoke OS NULL exception if reg = NULL 1414 } 1415 } 1416 1417 // MacroAssembler protected routines needed to implement 1418 // public methods 1419 1420 void MacroAssembler::mov(Register r, Address dest) { 1421 code_section()->relocate(pc(), dest.rspec()); 1422 u_int64_t imm64 = (u_int64_t)dest.target(); 1423 movptr(r, imm64); 1424 } 1425 1426 // Move a constant pointer into r. In AArch64 mode the virtual 1427 // address space is 48 bits in size, so we only need three 1428 // instructions to create a patchable instruction sequence that can 1429 // reach anywhere. 1430 void MacroAssembler::movptr(Register r, uintptr_t imm64) { 1431 #ifndef PRODUCT 1432 { 1433 char buffer[64]; 1434 snprintf(buffer, sizeof(buffer), "0x%"PRIX64, imm64); 1435 block_comment(buffer); 1436 } 1437 #endif 1438 assert(imm64 < (1ul << 48), "48-bit overflow in address constant"); 1439 movz(r, imm64 & 0xffff); 1440 imm64 >>= 16; 1441 movk(r, imm64 & 0xffff, 16); 1442 imm64 >>= 16; 1443 movk(r, imm64 & 0xffff, 32); 1444 } 1445 1446 // Macro to mov replicated immediate to vector register. 1447 // Vd will get the following values for different arrangements in T 1448 // imm32 == hex 000000gh T8B: Vd = ghghghghghghghgh 1449 // imm32 == hex 000000gh T16B: Vd = ghghghghghghghghghghghghghghghgh 1450 // imm32 == hex 0000efgh T4H: Vd = efghefghefghefgh 1451 // imm32 == hex 0000efgh T8H: Vd = efghefghefghefghefghefghefghefgh 1452 // imm32 == hex abcdefgh T2S: Vd = abcdefghabcdefgh 1453 // imm32 == hex abcdefgh T4S: Vd = abcdefghabcdefghabcdefghabcdefgh 1454 // T1D/T2D: invalid 1455 void MacroAssembler::mov(FloatRegister Vd, SIMD_Arrangement T, u_int32_t imm32) { 1456 assert(T != T1D && T != T2D, "invalid arrangement"); 1457 if (T == T8B || T == T16B) { 1458 assert((imm32 & ~0xff) == 0, "extraneous bits in unsigned imm32 (T8B/T16B)"); 1459 movi(Vd, T, imm32 & 0xff, 0); 1460 return; 1461 } 1462 u_int32_t nimm32 = ~imm32; 1463 if (T == T4H || T == T8H) { 1464 assert((imm32 & ~0xffff) == 0, "extraneous bits in unsigned imm32 (T4H/T8H)"); 1465 imm32 &= 0xffff; 1466 nimm32 &= 0xffff; 1467 } 1468 u_int32_t x = imm32; 1469 int movi_cnt = 0; 1470 int movn_cnt = 0; 1471 while (x) { if (x & 0xff) movi_cnt++; x >>= 8; } 1472 x = nimm32; 1473 while (x) { if (x & 0xff) movn_cnt++; x >>= 8; } 1474 if (movn_cnt < movi_cnt) imm32 = nimm32; 1475 unsigned lsl = 0; 1476 while (imm32 && (imm32 & 0xff) == 0) { lsl += 8; imm32 >>= 8; } 1477 if (movn_cnt < movi_cnt) 1478 mvni(Vd, T, imm32 & 0xff, lsl); 1479 else 1480 movi(Vd, T, imm32 & 0xff, lsl); 1481 imm32 >>= 8; lsl += 8; 1482 while (imm32) { 1483 while ((imm32 & 0xff) == 0) { lsl += 8; imm32 >>= 8; } 1484 if (movn_cnt < movi_cnt) 1485 bici(Vd, T, imm32 & 0xff, lsl); 1486 else 1487 orri(Vd, T, imm32 & 0xff, lsl); 1488 lsl += 8; imm32 >>= 8; 1489 } 1490 } 1491 1492 void MacroAssembler::mov_immediate64(Register dst, u_int64_t imm64) 1493 { 1494 #ifndef PRODUCT 1495 { 1496 char buffer[64]; 1497 snprintf(buffer, sizeof(buffer), "0x%"PRIX64, imm64); 1498 block_comment(buffer); 1499 } 1500 #endif 1501 if (operand_valid_for_logical_immediate(false, imm64)) { 1502 orr(dst, zr, imm64); 1503 } else { 1504 // we can use a combination of MOVZ or MOVN with 1505 // MOVK to build up the constant 1506 u_int64_t imm_h[4]; 1507 int zero_count = 0; 1508 int neg_count = 0; 1509 int i; 1510 for (i = 0; i < 4; i++) { 1511 imm_h[i] = ((imm64 >> (i * 16)) & 0xffffL); 1512 if (imm_h[i] == 0) { 1513 zero_count++; 1514 } else if (imm_h[i] == 0xffffL) { 1515 neg_count++; 1516 } 1517 } 1518 if (zero_count == 4) { 1519 // one MOVZ will do 1520 movz(dst, 0); 1521 } else if (neg_count == 4) { 1522 // one MOVN will do 1523 movn(dst, 0); 1524 } else if (zero_count == 3) { 1525 for (i = 0; i < 4; i++) { 1526 if (imm_h[i] != 0L) { 1527 movz(dst, (u_int32_t)imm_h[i], (i << 4)); 1528 break; 1529 } 1530 } 1531 } else if (neg_count == 3) { 1532 // one MOVN will do 1533 for (int i = 0; i < 4; i++) { 1534 if (imm_h[i] != 0xffffL) { 1535 movn(dst, (u_int32_t)imm_h[i] ^ 0xffffL, (i << 4)); 1536 break; 1537 } 1538 } 1539 } else if (zero_count == 2) { 1540 // one MOVZ and one MOVK will do 1541 for (i = 0; i < 3; i++) { 1542 if (imm_h[i] != 0L) { 1543 movz(dst, (u_int32_t)imm_h[i], (i << 4)); 1544 i++; 1545 break; 1546 } 1547 } 1548 for (;i < 4; i++) { 1549 if (imm_h[i] != 0L) { 1550 movk(dst, (u_int32_t)imm_h[i], (i << 4)); 1551 } 1552 } 1553 } else if (neg_count == 2) { 1554 // one MOVN and one MOVK will do 1555 for (i = 0; i < 4; i++) { 1556 if (imm_h[i] != 0xffffL) { 1557 movn(dst, (u_int32_t)imm_h[i] ^ 0xffffL, (i << 4)); 1558 i++; 1559 break; 1560 } 1561 } 1562 for (;i < 4; i++) { 1563 if (imm_h[i] != 0xffffL) { 1564 movk(dst, (u_int32_t)imm_h[i], (i << 4)); 1565 } 1566 } 1567 } else if (zero_count == 1) { 1568 // one MOVZ and two MOVKs will do 1569 for (i = 0; i < 4; i++) { 1570 if (imm_h[i] != 0L) { 1571 movz(dst, (u_int32_t)imm_h[i], (i << 4)); 1572 i++; 1573 break; 1574 } 1575 } 1576 for (;i < 4; i++) { 1577 if (imm_h[i] != 0x0L) { 1578 movk(dst, (u_int32_t)imm_h[i], (i << 4)); 1579 } 1580 } 1581 } else if (neg_count == 1) { 1582 // one MOVN and two MOVKs will do 1583 for (i = 0; i < 4; i++) { 1584 if (imm_h[i] != 0xffffL) { 1585 movn(dst, (u_int32_t)imm_h[i] ^ 0xffffL, (i << 4)); 1586 i++; 1587 break; 1588 } 1589 } 1590 for (;i < 4; i++) { 1591 if (imm_h[i] != 0xffffL) { 1592 movk(dst, (u_int32_t)imm_h[i], (i << 4)); 1593 } 1594 } 1595 } else { 1596 // use a MOVZ and 3 MOVKs (makes it easier to debug) 1597 movz(dst, (u_int32_t)imm_h[0], 0); 1598 for (i = 1; i < 4; i++) { 1599 movk(dst, (u_int32_t)imm_h[i], (i << 4)); 1600 } 1601 } 1602 } 1603 } 1604 1605 void MacroAssembler::mov_immediate32(Register dst, u_int32_t imm32) 1606 { 1607 #ifndef PRODUCT 1608 { 1609 char buffer[64]; 1610 snprintf(buffer, sizeof(buffer), "0x%"PRIX32, imm32); 1611 block_comment(buffer); 1612 } 1613 #endif 1614 if (operand_valid_for_logical_immediate(true, imm32)) { 1615 orrw(dst, zr, imm32); 1616 } else { 1617 // we can use MOVZ, MOVN or two calls to MOVK to build up the 1618 // constant 1619 u_int32_t imm_h[2]; 1620 imm_h[0] = imm32 & 0xffff; 1621 imm_h[1] = ((imm32 >> 16) & 0xffff); 1622 if (imm_h[0] == 0) { 1623 movzw(dst, imm_h[1], 16); 1624 } else if (imm_h[0] == 0xffff) { 1625 movnw(dst, imm_h[1] ^ 0xffff, 16); 1626 } else if (imm_h[1] == 0) { 1627 movzw(dst, imm_h[0], 0); 1628 } else if (imm_h[1] == 0xffff) { 1629 movnw(dst, imm_h[0] ^ 0xffff, 0); 1630 } else { 1631 // use a MOVZ and MOVK (makes it easier to debug) 1632 movzw(dst, imm_h[0], 0); 1633 movkw(dst, imm_h[1], 16); 1634 } 1635 } 1636 } 1637 1638 // Form an address from base + offset in Rd. Rd may or may 1639 // not actually be used: you must use the Address that is returned. 1640 // It is up to you to ensure that the shift provided matches the size 1641 // of your data. 1642 Address MacroAssembler::form_address(Register Rd, Register base, long byte_offset, int shift) { 1643 if (Address::offset_ok_for_immed(byte_offset, shift)) 1644 // It fits; no need for any heroics 1645 return Address(base, byte_offset); 1646 1647 // Don't do anything clever with negative or misaligned offsets 1648 unsigned mask = (1 << shift) - 1; 1649 if (byte_offset < 0 || byte_offset & mask) { 1650 mov(Rd, byte_offset); 1651 add(Rd, base, Rd); 1652 return Address(Rd); 1653 } 1654 1655 // See if we can do this with two 12-bit offsets 1656 { 1657 unsigned long word_offset = byte_offset >> shift; 1658 unsigned long masked_offset = word_offset & 0xfff000; 1659 if (Address::offset_ok_for_immed(word_offset - masked_offset) 1660 && Assembler::operand_valid_for_add_sub_immediate(masked_offset << shift)) { 1661 add(Rd, base, masked_offset << shift); 1662 word_offset -= masked_offset; 1663 return Address(Rd, word_offset << shift); 1664 } 1665 } 1666 1667 // Do it the hard way 1668 mov(Rd, byte_offset); 1669 add(Rd, base, Rd); 1670 return Address(Rd); 1671 } 1672 1673 void MacroAssembler::atomic_incw(Register counter_addr, Register tmp, Register tmp2) { 1674 if (UseLSE) { 1675 mov(tmp, 1); 1676 ldadd(Assembler::word, tmp, zr, counter_addr); 1677 return; 1678 } 1679 Label retry_load; 1680 if ((VM_Version::features() & VM_Version::CPU_STXR_PREFETCH)) 1681 prfm(Address(counter_addr), PSTL1STRM); 1682 bind(retry_load); 1683 // flush and load exclusive from the memory location 1684 ldxrw(tmp, counter_addr); 1685 addw(tmp, tmp, 1); 1686 // if we store+flush with no intervening write tmp wil be zero 1687 stxrw(tmp2, tmp, counter_addr); 1688 cbnzw(tmp2, retry_load); 1689 } 1690 1691 1692 int MacroAssembler::corrected_idivl(Register result, Register ra, Register rb, 1693 bool want_remainder, Register scratch) 1694 { 1695 // Full implementation of Java idiv and irem. The function 1696 // returns the (pc) offset of the div instruction - may be needed 1697 // for implicit exceptions. 1698 // 1699 // constraint : ra/rb =/= scratch 1700 // normal case 1701 // 1702 // input : ra: dividend 1703 // rb: divisor 1704 // 1705 // result: either 1706 // quotient (= ra idiv rb) 1707 // remainder (= ra irem rb) 1708 1709 assert(ra != scratch && rb != scratch, "reg cannot be scratch"); 1710 1711 int idivl_offset = offset(); 1712 if (! want_remainder) { 1713 sdivw(result, ra, rb); 1714 } else { 1715 sdivw(scratch, ra, rb); 1716 Assembler::msubw(result, scratch, rb, ra); 1717 } 1718 1719 return idivl_offset; 1720 } 1721 1722 int MacroAssembler::corrected_idivq(Register result, Register ra, Register rb, 1723 bool want_remainder, Register scratch) 1724 { 1725 // Full implementation of Java ldiv and lrem. The function 1726 // returns the (pc) offset of the div instruction - may be needed 1727 // for implicit exceptions. 1728 // 1729 // constraint : ra/rb =/= scratch 1730 // normal case 1731 // 1732 // input : ra: dividend 1733 // rb: divisor 1734 // 1735 // result: either 1736 // quotient (= ra idiv rb) 1737 // remainder (= ra irem rb) 1738 1739 assert(ra != scratch && rb != scratch, "reg cannot be scratch"); 1740 1741 int idivq_offset = offset(); 1742 if (! want_remainder) { 1743 sdiv(result, ra, rb); 1744 } else { 1745 sdiv(scratch, ra, rb); 1746 Assembler::msub(result, scratch, rb, ra); 1747 } 1748 1749 return idivq_offset; 1750 } 1751 1752 void MacroAssembler::membar(Membar_mask_bits order_constraint) { 1753 address prev = pc() - NativeMembar::instruction_size; 1754 if (prev == code()->last_membar()) { 1755 NativeMembar *bar = NativeMembar_at(prev); 1756 // We are merging two memory barrier instructions. On AArch64 we 1757 // can do this simply by ORing them together. 1758 bar->set_kind(bar->get_kind() | order_constraint); 1759 BLOCK_COMMENT("merged membar"); 1760 } else { 1761 code()->set_last_membar(pc()); 1762 dmb(Assembler::barrier(order_constraint)); 1763 } 1764 } 1765 1766 // MacroAssembler routines found actually to be needed 1767 1768 void MacroAssembler::push(Register src) 1769 { 1770 str(src, Address(pre(esp, -1 * wordSize))); 1771 } 1772 1773 void MacroAssembler::pop(Register dst) 1774 { 1775 ldr(dst, Address(post(esp, 1 * wordSize))); 1776 } 1777 1778 // Note: load_unsigned_short used to be called load_unsigned_word. 1779 int MacroAssembler::load_unsigned_short(Register dst, Address src) { 1780 int off = offset(); 1781 ldrh(dst, src); 1782 return off; 1783 } 1784 1785 int MacroAssembler::load_unsigned_byte(Register dst, Address src) { 1786 int off = offset(); 1787 ldrb(dst, src); 1788 return off; 1789 } 1790 1791 int MacroAssembler::load_signed_short(Register dst, Address src) { 1792 int off = offset(); 1793 ldrsh(dst, src); 1794 return off; 1795 } 1796 1797 int MacroAssembler::load_signed_byte(Register dst, Address src) { 1798 int off = offset(); 1799 ldrsb(dst, src); 1800 return off; 1801 } 1802 1803 int MacroAssembler::load_signed_short32(Register dst, Address src) { 1804 int off = offset(); 1805 ldrshw(dst, src); 1806 return off; 1807 } 1808 1809 int MacroAssembler::load_signed_byte32(Register dst, Address src) { 1810 int off = offset(); 1811 ldrsbw(dst, src); 1812 return off; 1813 } 1814 1815 void MacroAssembler::load_sized_value(Register dst, Address src, size_t size_in_bytes, bool is_signed, Register dst2) { 1816 switch (size_in_bytes) { 1817 case 8: ldr(dst, src); break; 1818 case 4: ldrw(dst, src); break; 1819 case 2: is_signed ? load_signed_short(dst, src) : load_unsigned_short(dst, src); break; 1820 case 1: is_signed ? load_signed_byte( dst, src) : load_unsigned_byte( dst, src); break; 1821 default: ShouldNotReachHere(); 1822 } 1823 } 1824 1825 void MacroAssembler::store_sized_value(Address dst, Register src, size_t size_in_bytes, Register src2) { 1826 switch (size_in_bytes) { 1827 case 8: str(src, dst); break; 1828 case 4: strw(src, dst); break; 1829 case 2: strh(src, dst); break; 1830 case 1: strb(src, dst); break; 1831 default: ShouldNotReachHere(); 1832 } 1833 } 1834 1835 void MacroAssembler::decrementw(Register reg, int value) 1836 { 1837 if (value < 0) { incrementw(reg, -value); return; } 1838 if (value == 0) { return; } 1839 if (value < (1 << 12)) { subw(reg, reg, value); return; } 1840 /* else */ { 1841 guarantee(reg != rscratch2, "invalid dst for register decrement"); 1842 movw(rscratch2, (unsigned)value); 1843 subw(reg, reg, rscratch2); 1844 } 1845 } 1846 1847 void MacroAssembler::decrement(Register reg, int value) 1848 { 1849 if (value < 0) { increment(reg, -value); return; } 1850 if (value == 0) { return; } 1851 if (value < (1 << 12)) { sub(reg, reg, value); return; } 1852 /* else */ { 1853 assert(reg != rscratch2, "invalid dst for register decrement"); 1854 mov(rscratch2, (unsigned long)value); 1855 sub(reg, reg, rscratch2); 1856 } 1857 } 1858 1859 void MacroAssembler::decrementw(Address dst, int value) 1860 { 1861 assert(!dst.uses(rscratch1), "invalid dst for address decrement"); 1862 ldrw(rscratch1, dst); 1863 decrementw(rscratch1, value); 1864 strw(rscratch1, dst); 1865 } 1866 1867 void MacroAssembler::decrement(Address dst, int value) 1868 { 1869 assert(!dst.uses(rscratch1), "invalid address for decrement"); 1870 ldr(rscratch1, dst); 1871 decrement(rscratch1, value); 1872 str(rscratch1, dst); 1873 } 1874 1875 void MacroAssembler::incrementw(Register reg, int value) 1876 { 1877 if (value < 0) { decrementw(reg, -value); return; } 1878 if (value == 0) { return; } 1879 if (value < (1 << 12)) { addw(reg, reg, value); return; } 1880 /* else */ { 1881 assert(reg != rscratch2, "invalid dst for register increment"); 1882 movw(rscratch2, (unsigned)value); 1883 addw(reg, reg, rscratch2); 1884 } 1885 } 1886 1887 void MacroAssembler::increment(Register reg, int value) 1888 { 1889 if (value < 0) { decrement(reg, -value); return; } 1890 if (value == 0) { return; } 1891 if (value < (1 << 12)) { add(reg, reg, value); return; } 1892 /* else */ { 1893 assert(reg != rscratch2, "invalid dst for register increment"); 1894 movw(rscratch2, (unsigned)value); 1895 add(reg, reg, rscratch2); 1896 } 1897 } 1898 1899 void MacroAssembler::incrementw(Address dst, int value) 1900 { 1901 assert(!dst.uses(rscratch1), "invalid dst for address increment"); 1902 ldrw(rscratch1, dst); 1903 incrementw(rscratch1, value); 1904 strw(rscratch1, dst); 1905 } 1906 1907 void MacroAssembler::increment(Address dst, int value) 1908 { 1909 assert(!dst.uses(rscratch1), "invalid dst for address increment"); 1910 ldr(rscratch1, dst); 1911 increment(rscratch1, value); 1912 str(rscratch1, dst); 1913 } 1914 1915 1916 void MacroAssembler::pusha() { 1917 push(0x7fffffff, sp); 1918 } 1919 1920 void MacroAssembler::popa() { 1921 pop(0x7fffffff, sp); 1922 } 1923 1924 // Push lots of registers in the bit set supplied. Don't push sp. 1925 // Return the number of words pushed 1926 int MacroAssembler::push(unsigned int bitset, Register stack) { 1927 int words_pushed = 0; 1928 1929 // Scan bitset to accumulate register pairs 1930 unsigned char regs[32]; 1931 int count = 0; 1932 for (int reg = 0; reg <= 30; reg++) { 1933 if (1 & bitset) 1934 regs[count++] = reg; 1935 bitset >>= 1; 1936 } 1937 regs[count++] = zr->encoding_nocheck(); 1938 count &= ~1; // Only push an even nuber of regs 1939 1940 if (count) { 1941 stp(as_Register(regs[0]), as_Register(regs[1]), 1942 Address(pre(stack, -count * wordSize))); 1943 words_pushed += 2; 1944 } 1945 for (int i = 2; i < count; i += 2) { 1946 stp(as_Register(regs[i]), as_Register(regs[i+1]), 1947 Address(stack, i * wordSize)); 1948 words_pushed += 2; 1949 } 1950 1951 assert(words_pushed == count, "oops, pushed != count"); 1952 1953 return count; 1954 } 1955 1956 int MacroAssembler::pop(unsigned int bitset, Register stack) { 1957 int words_pushed = 0; 1958 1959 // Scan bitset to accumulate register pairs 1960 unsigned char regs[32]; 1961 int count = 0; 1962 for (int reg = 0; reg <= 30; reg++) { 1963 if (1 & bitset) 1964 regs[count++] = reg; 1965 bitset >>= 1; 1966 } 1967 regs[count++] = zr->encoding_nocheck(); 1968 count &= ~1; 1969 1970 for (int i = 2; i < count; i += 2) { 1971 ldp(as_Register(regs[i]), as_Register(regs[i+1]), 1972 Address(stack, i * wordSize)); 1973 words_pushed += 2; 1974 } 1975 if (count) { 1976 ldp(as_Register(regs[0]), as_Register(regs[1]), 1977 Address(post(stack, count * wordSize))); 1978 words_pushed += 2; 1979 } 1980 1981 assert(words_pushed == count, "oops, pushed != count"); 1982 1983 return count; 1984 } 1985 #ifdef ASSERT 1986 void MacroAssembler::verify_heapbase(const char* msg) { 1987 #if 0 1988 assert (UseCompressedOops || UseCompressedClassPointers, "should be compressed"); 1989 assert (Universe::heap() != NULL, "java heap should be initialized"); 1990 if (CheckCompressedOops) { 1991 Label ok; 1992 push(1 << rscratch1->encoding(), sp); // cmpptr trashes rscratch1 1993 cmpptr(rheapbase, ExternalAddress((address)Universe::narrow_ptrs_base_addr())); 1994 br(Assembler::EQ, ok); 1995 stop(msg); 1996 bind(ok); 1997 pop(1 << rscratch1->encoding(), sp); 1998 } 1999 #endif 2000 } 2001 #endif 2002 2003 void MacroAssembler::stop(const char* msg) { 2004 address ip = pc(); 2005 pusha(); 2006 mov(c_rarg0, (address)msg); 2007 mov(c_rarg1, (address)ip); 2008 mov(c_rarg2, sp); 2009 mov(c_rarg3, CAST_FROM_FN_PTR(address, MacroAssembler::debug64)); 2010 // call(c_rarg3); 2011 blrt(c_rarg3, 3, 0, 1); 2012 hlt(0); 2013 } 2014 2015 void MacroAssembler::unimplemented(const char* what) { 2016 char* b = new char[1024]; 2017 jio_snprintf(b, 1024, "unimplemented: %s", what); 2018 stop(b); 2019 } 2020 2021 // If a constant does not fit in an immediate field, generate some 2022 // number of MOV instructions and then perform the operation. 2023 void MacroAssembler::wrap_add_sub_imm_insn(Register Rd, Register Rn, unsigned imm, 2024 add_sub_imm_insn insn1, 2025 add_sub_reg_insn insn2) { 2026 assert(Rd != zr, "Rd = zr and not setting flags?"); 2027 if (operand_valid_for_add_sub_immediate((int)imm)) { 2028 (this->*insn1)(Rd, Rn, imm); 2029 } else { 2030 if (uabs(imm) < (1 << 24)) { 2031 (this->*insn1)(Rd, Rn, imm & -(1 << 12)); 2032 (this->*insn1)(Rd, Rd, imm & ((1 << 12)-1)); 2033 } else { 2034 assert_different_registers(Rd, Rn); 2035 mov(Rd, (uint64_t)imm); 2036 (this->*insn2)(Rd, Rn, Rd, LSL, 0); 2037 } 2038 } 2039 } 2040 2041 // Seperate vsn which sets the flags. Optimisations are more restricted 2042 // because we must set the flags correctly. 2043 void MacroAssembler::wrap_adds_subs_imm_insn(Register Rd, Register Rn, unsigned imm, 2044 add_sub_imm_insn insn1, 2045 add_sub_reg_insn insn2) { 2046 if (operand_valid_for_add_sub_immediate((int)imm)) { 2047 (this->*insn1)(Rd, Rn, imm); 2048 } else { 2049 assert_different_registers(Rd, Rn); 2050 assert(Rd != zr, "overflow in immediate operand"); 2051 mov(Rd, (uint64_t)imm); 2052 (this->*insn2)(Rd, Rn, Rd, LSL, 0); 2053 } 2054 } 2055 2056 2057 void MacroAssembler::add(Register Rd, Register Rn, RegisterOrConstant increment) { 2058 if (increment.is_register()) { 2059 add(Rd, Rn, increment.as_register()); 2060 } else { 2061 add(Rd, Rn, increment.as_constant()); 2062 } 2063 } 2064 2065 void MacroAssembler::addw(Register Rd, Register Rn, RegisterOrConstant increment) { 2066 if (increment.is_register()) { 2067 addw(Rd, Rn, increment.as_register()); 2068 } else { 2069 addw(Rd, Rn, increment.as_constant()); 2070 } 2071 } 2072 2073 void MacroAssembler::sub(Register Rd, Register Rn, RegisterOrConstant decrement) { 2074 if (decrement.is_register()) { 2075 sub(Rd, Rn, decrement.as_register()); 2076 } else { 2077 sub(Rd, Rn, decrement.as_constant()); 2078 } 2079 } 2080 2081 void MacroAssembler::subw(Register Rd, Register Rn, RegisterOrConstant decrement) { 2082 if (decrement.is_register()) { 2083 subw(Rd, Rn, decrement.as_register()); 2084 } else { 2085 subw(Rd, Rn, decrement.as_constant()); 2086 } 2087 } 2088 2089 void MacroAssembler::reinit_heapbase() 2090 { 2091 if (UseCompressedOops) { 2092 if (Universe::is_fully_initialized()) { 2093 mov(rheapbase, Universe::narrow_ptrs_base()); 2094 } else { 2095 lea(rheapbase, ExternalAddress((address)Universe::narrow_ptrs_base_addr())); 2096 ldr(rheapbase, Address(rheapbase)); 2097 } 2098 } 2099 } 2100 2101 // this simulates the behaviour of the x86 cmpxchg instruction using a 2102 // load linked/store conditional pair. we use the acquire/release 2103 // versions of these instructions so that we flush pending writes as 2104 // per Java semantics. 2105 2106 // n.b the x86 version assumes the old value to be compared against is 2107 // in rax and updates rax with the value located in memory if the 2108 // cmpxchg fails. we supply a register for the old value explicitly 2109 2110 // the aarch64 load linked/store conditional instructions do not 2111 // accept an offset. so, unlike x86, we must provide a plain register 2112 // to identify the memory word to be compared/exchanged rather than a 2113 // register+offset Address. 2114 2115 void MacroAssembler::cmpxchgptr(Register oldv, Register newv, Register addr, Register tmp, 2116 Label &succeed, Label *fail) { 2117 // oldv holds comparison value 2118 // newv holds value to write in exchange 2119 // addr identifies memory word to compare against/update 2120 if (UseLSE) { 2121 mov(tmp, oldv); 2122 casal(Assembler::xword, oldv, newv, addr); 2123 cmp(tmp, oldv); 2124 br(Assembler::EQ, succeed); 2125 membar(AnyAny); 2126 } else { 2127 Label retry_load, nope; 2128 if ((VM_Version::features() & VM_Version::CPU_STXR_PREFETCH)) 2129 prfm(Address(addr), PSTL1STRM); 2130 bind(retry_load); 2131 // flush and load exclusive from the memory location 2132 // and fail if it is not what we expect 2133 ldaxr(tmp, addr); 2134 cmp(tmp, oldv); 2135 br(Assembler::NE, nope); 2136 // if we store+flush with no intervening write tmp wil be zero 2137 stlxr(tmp, newv, addr); 2138 cbzw(tmp, succeed); 2139 // retry so we only ever return after a load fails to compare 2140 // ensures we don't return a stale value after a failed write. 2141 b(retry_load); 2142 // if the memory word differs we return it in oldv and signal a fail 2143 bind(nope); 2144 membar(AnyAny); 2145 mov(oldv, tmp); 2146 } 2147 if (fail) 2148 b(*fail); 2149 } 2150 2151 void MacroAssembler::cmpxchg_obj_header(Register oldv, Register newv, Register obj, Register tmp, 2152 Label &succeed, Label *fail) { 2153 assert(oopDesc::mark_offset_in_bytes() == 0, "assumption"); 2154 cmpxchgptr(oldv, newv, obj, tmp, succeed, fail); 2155 } 2156 2157 void MacroAssembler::cmpxchgw(Register oldv, Register newv, Register addr, Register tmp, 2158 Label &succeed, Label *fail) { 2159 // oldv holds comparison value 2160 // newv holds value to write in exchange 2161 // addr identifies memory word to compare against/update 2162 // tmp returns 0/1 for success/failure 2163 if (UseLSE) { 2164 mov(tmp, oldv); 2165 casal(Assembler::word, oldv, newv, addr); 2166 cmp(tmp, oldv); 2167 br(Assembler::EQ, succeed); 2168 membar(AnyAny); 2169 } else { 2170 Label retry_load, nope; 2171 if ((VM_Version::features() & VM_Version::CPU_STXR_PREFETCH)) 2172 prfm(Address(addr), PSTL1STRM); 2173 bind(retry_load); 2174 // flush and load exclusive from the memory location 2175 // and fail if it is not what we expect 2176 ldaxrw(tmp, addr); 2177 cmp(tmp, oldv); 2178 br(Assembler::NE, nope); 2179 // if we store+flush with no intervening write tmp wil be zero 2180 stlxrw(tmp, newv, addr); 2181 cbzw(tmp, succeed); 2182 // retry so we only ever return after a load fails to compare 2183 // ensures we don't return a stale value after a failed write. 2184 b(retry_load); 2185 // if the memory word differs we return it in oldv and signal a fail 2186 bind(nope); 2187 membar(AnyAny); 2188 mov(oldv, tmp); 2189 } 2190 if (fail) 2191 b(*fail); 2192 } 2193 2194 // A generic CAS; success or failure is in the EQ flag. A weak CAS 2195 // doesn't retry and may fail spuriously. If the oldval is wanted, 2196 // Pass a register for the result, otherwise pass noreg. 2197 2198 // Clobbers rscratch1 2199 void MacroAssembler::cmpxchg(Register addr, Register expected, 2200 Register new_val, 2201 enum operand_size size, 2202 bool acquire, bool release, 2203 bool weak, 2204 Register result) { 2205 if (result == noreg) result = rscratch1; 2206 if (UseLSE) { 2207 mov(result, expected); 2208 lse_cas(result, new_val, addr, size, acquire, release, /*not_pair*/ true); 2209 cmp(result, expected); 2210 } else { 2211 BLOCK_COMMENT("cmpxchg {"); 2212 Label retry_load, done; 2213 if ((VM_Version::features() & VM_Version::CPU_STXR_PREFETCH)) 2214 prfm(Address(addr), PSTL1STRM); 2215 bind(retry_load); 2216 load_exclusive(result, addr, size, acquire); 2217 if (size == xword) 2218 cmp(result, expected); 2219 else 2220 cmpw(result, expected); 2221 br(Assembler::NE, done); 2222 store_exclusive(rscratch1, new_val, addr, size, release); 2223 if (weak) { 2224 cmpw(rscratch1, 0u); // If the store fails, return NE to our caller. 2225 } else { 2226 cbnzw(rscratch1, retry_load); 2227 } 2228 bind(done); 2229 BLOCK_COMMENT("} cmpxchg"); 2230 } 2231 } 2232 2233 static bool different(Register a, RegisterOrConstant b, Register c) { 2234 if (b.is_constant()) 2235 return a != c; 2236 else 2237 return a != b.as_register() && a != c && b.as_register() != c; 2238 } 2239 2240 #define ATOMIC_OP(NAME, LDXR, OP, IOP, AOP, STXR, sz) \ 2241 void MacroAssembler::atomic_##NAME(Register prev, RegisterOrConstant incr, Register addr) { \ 2242 if (UseLSE) { \ 2243 prev = prev->is_valid() ? prev : zr; \ 2244 if (incr.is_register()) { \ 2245 AOP(sz, incr.as_register(), prev, addr); \ 2246 } else { \ 2247 mov(rscratch2, incr.as_constant()); \ 2248 AOP(sz, rscratch2, prev, addr); \ 2249 } \ 2250 return; \ 2251 } \ 2252 Register result = rscratch2; \ 2253 if (prev->is_valid()) \ 2254 result = different(prev, incr, addr) ? prev : rscratch2; \ 2255 \ 2256 Label retry_load; \ 2257 if ((VM_Version::features() & VM_Version::CPU_STXR_PREFETCH)) \ 2258 prfm(Address(addr), PSTL1STRM); \ 2259 bind(retry_load); \ 2260 LDXR(result, addr); \ 2261 OP(rscratch1, result, incr); \ 2262 STXR(rscratch2, rscratch1, addr); \ 2263 cbnzw(rscratch2, retry_load); \ 2264 if (prev->is_valid() && prev != result) { \ 2265 IOP(prev, rscratch1, incr); \ 2266 } \ 2267 } 2268 2269 ATOMIC_OP(add, ldxr, add, sub, ldadd, stxr, Assembler::xword) 2270 ATOMIC_OP(addw, ldxrw, addw, subw, ldadd, stxrw, Assembler::word) 2271 ATOMIC_OP(addal, ldaxr, add, sub, ldaddal, stlxr, Assembler::xword) 2272 ATOMIC_OP(addalw, ldaxrw, addw, subw, ldaddal, stlxrw, Assembler::word) 2273 2274 #undef ATOMIC_OP 2275 2276 #define ATOMIC_XCHG(OP, AOP, LDXR, STXR, sz) \ 2277 void MacroAssembler::atomic_##OP(Register prev, Register newv, Register addr) { \ 2278 if (UseLSE) { \ 2279 prev = prev->is_valid() ? prev : zr; \ 2280 AOP(sz, newv, prev, addr); \ 2281 return; \ 2282 } \ 2283 Register result = rscratch2; \ 2284 if (prev->is_valid()) \ 2285 result = different(prev, newv, addr) ? prev : rscratch2; \ 2286 \ 2287 Label retry_load; \ 2288 if ((VM_Version::features() & VM_Version::CPU_STXR_PREFETCH)) \ 2289 prfm(Address(addr), PSTL1STRM); \ 2290 bind(retry_load); \ 2291 LDXR(result, addr); \ 2292 STXR(rscratch1, newv, addr); \ 2293 cbnzw(rscratch1, retry_load); \ 2294 if (prev->is_valid() && prev != result) \ 2295 mov(prev, result); \ 2296 } 2297 2298 ATOMIC_XCHG(xchg, swp, ldxr, stxr, Assembler::xword) 2299 ATOMIC_XCHG(xchgw, swp, ldxrw, stxrw, Assembler::word) 2300 ATOMIC_XCHG(xchgal, swpal, ldaxr, stlxr, Assembler::xword) 2301 ATOMIC_XCHG(xchgalw, swpal, ldaxrw, stlxrw, Assembler::word) 2302 2303 #undef ATOMIC_XCHG 2304 2305 void MacroAssembler::incr_allocated_bytes(Register thread, 2306 Register var_size_in_bytes, 2307 int con_size_in_bytes, 2308 Register t1) { 2309 if (!thread->is_valid()) { 2310 thread = rthread; 2311 } 2312 assert(t1->is_valid(), "need temp reg"); 2313 2314 ldr(t1, Address(thread, in_bytes(JavaThread::allocated_bytes_offset()))); 2315 if (var_size_in_bytes->is_valid()) { 2316 add(t1, t1, var_size_in_bytes); 2317 } else { 2318 add(t1, t1, con_size_in_bytes); 2319 } 2320 str(t1, Address(thread, in_bytes(JavaThread::allocated_bytes_offset()))); 2321 } 2322 2323 #ifndef PRODUCT 2324 extern "C" void findpc(intptr_t x); 2325 #endif 2326 2327 void MacroAssembler::debug64(char* msg, int64_t pc, int64_t regs[]) 2328 { 2329 // In order to get locks to work, we need to fake a in_VM state 2330 if (ShowMessageBoxOnError ) { 2331 JavaThread* thread = JavaThread::current(); 2332 JavaThreadState saved_state = thread->thread_state(); 2333 thread->set_thread_state(_thread_in_vm); 2334 #ifndef PRODUCT 2335 if (CountBytecodes || TraceBytecodes || StopInterpreterAt) { 2336 ttyLocker ttyl; 2337 BytecodeCounter::print(); 2338 } 2339 #endif 2340 if (os::message_box(msg, "Execution stopped, print registers?")) { 2341 ttyLocker ttyl; 2342 tty->print_cr(" pc = 0x%016lx", pc); 2343 #ifndef PRODUCT 2344 tty->cr(); 2345 findpc(pc); 2346 tty->cr(); 2347 #endif 2348 tty->print_cr(" r0 = 0x%016lx", regs[0]); 2349 tty->print_cr(" r1 = 0x%016lx", regs[1]); 2350 tty->print_cr(" r2 = 0x%016lx", regs[2]); 2351 tty->print_cr(" r3 = 0x%016lx", regs[3]); 2352 tty->print_cr(" r4 = 0x%016lx", regs[4]); 2353 tty->print_cr(" r5 = 0x%016lx", regs[5]); 2354 tty->print_cr(" r6 = 0x%016lx", regs[6]); 2355 tty->print_cr(" r7 = 0x%016lx", regs[7]); 2356 tty->print_cr(" r8 = 0x%016lx", regs[8]); 2357 tty->print_cr(" r9 = 0x%016lx", regs[9]); 2358 tty->print_cr("r10 = 0x%016lx", regs[10]); 2359 tty->print_cr("r11 = 0x%016lx", regs[11]); 2360 tty->print_cr("r12 = 0x%016lx", regs[12]); 2361 tty->print_cr("r13 = 0x%016lx", regs[13]); 2362 tty->print_cr("r14 = 0x%016lx", regs[14]); 2363 tty->print_cr("r15 = 0x%016lx", regs[15]); 2364 tty->print_cr("r16 = 0x%016lx", regs[16]); 2365 tty->print_cr("r17 = 0x%016lx", regs[17]); 2366 tty->print_cr("r18 = 0x%016lx", regs[18]); 2367 tty->print_cr("r19 = 0x%016lx", regs[19]); 2368 tty->print_cr("r20 = 0x%016lx", regs[20]); 2369 tty->print_cr("r21 = 0x%016lx", regs[21]); 2370 tty->print_cr("r22 = 0x%016lx", regs[22]); 2371 tty->print_cr("r23 = 0x%016lx", regs[23]); 2372 tty->print_cr("r24 = 0x%016lx", regs[24]); 2373 tty->print_cr("r25 = 0x%016lx", regs[25]); 2374 tty->print_cr("r26 = 0x%016lx", regs[26]); 2375 tty->print_cr("r27 = 0x%016lx", regs[27]); 2376 tty->print_cr("r28 = 0x%016lx", regs[28]); 2377 tty->print_cr("r30 = 0x%016lx", regs[30]); 2378 tty->print_cr("r31 = 0x%016lx", regs[31]); 2379 BREAKPOINT; 2380 } 2381 ThreadStateTransition::transition(thread, _thread_in_vm, saved_state); 2382 } else { 2383 ttyLocker ttyl; 2384 ::tty->print_cr("=============== DEBUG MESSAGE: %s ================\n", 2385 msg); 2386 assert(false, "DEBUG MESSAGE: %s", msg); 2387 } 2388 } 2389 2390 #ifdef BUILTIN_SIM 2391 // routine to generate an x86 prolog for a stub function which 2392 // bootstraps into the generated ARM code which directly follows the 2393 // stub 2394 // 2395 // the argument encodes the number of general and fp registers 2396 // passed by the caller and the callng convention (currently just 2397 // the number of general registers and assumes C argument passing) 2398 2399 extern "C" { 2400 int aarch64_stub_prolog_size(); 2401 void aarch64_stub_prolog(); 2402 void aarch64_prolog(); 2403 } 2404 2405 void MacroAssembler::c_stub_prolog(int gp_arg_count, int fp_arg_count, int ret_type, 2406 address *prolog_ptr) 2407 { 2408 int calltype = (((ret_type & 0x3) << 8) | 2409 ((fp_arg_count & 0xf) << 4) | 2410 (gp_arg_count & 0xf)); 2411 2412 // the addresses for the x86 to ARM entry code we need to use 2413 address start = pc(); 2414 // printf("start = %lx\n", start); 2415 int byteCount = aarch64_stub_prolog_size(); 2416 // printf("byteCount = %x\n", byteCount); 2417 int instructionCount = (byteCount + 3)/ 4; 2418 // printf("instructionCount = %x\n", instructionCount); 2419 for (int i = 0; i < instructionCount; i++) { 2420 nop(); 2421 } 2422 2423 memcpy(start, (void*)aarch64_stub_prolog, byteCount); 2424 2425 // write the address of the setup routine and the call format at the 2426 // end of into the copied code 2427 u_int64_t *patch_end = (u_int64_t *)(start + byteCount); 2428 if (prolog_ptr) 2429 patch_end[-2] = (u_int64_t)prolog_ptr; 2430 patch_end[-1] = calltype; 2431 } 2432 #endif 2433 2434 void MacroAssembler::push_call_clobbered_registers() { 2435 push(RegSet::range(r0, r18) - RegSet::of(rscratch1, rscratch2), sp); 2436 2437 // Push v0-v7, v16-v31. 2438 for (int i = 30; i >= 0; i -= 2) { 2439 if (i <= v7->encoding() || i >= v16->encoding()) { 2440 stpd(as_FloatRegister(i), as_FloatRegister(i+1), 2441 Address(pre(sp, -2 * wordSize))); 2442 } 2443 } 2444 } 2445 2446 void MacroAssembler::pop_call_clobbered_registers() { 2447 2448 for (int i = 0; i < 32; i += 2) { 2449 if (i <= v7->encoding() || i >= v16->encoding()) { 2450 ldpd(as_FloatRegister(i), as_FloatRegister(i+1), 2451 Address(post(sp, 2 * wordSize))); 2452 } 2453 } 2454 2455 pop(RegSet::range(r0, r18) - RegSet::of(rscratch1, rscratch2), sp); 2456 } 2457 2458 void MacroAssembler::push_CPU_state(bool save_vectors) { 2459 push(0x3fffffff, sp); // integer registers except lr & sp 2460 2461 if (!save_vectors) { 2462 for (int i = 30; i >= 0; i -= 2) 2463 stpd(as_FloatRegister(i), as_FloatRegister(i+1), 2464 Address(pre(sp, -2 * wordSize))); 2465 } else { 2466 for (int i = 30; i >= 0; i -= 2) 2467 stpq(as_FloatRegister(i), as_FloatRegister(i+1), 2468 Address(pre(sp, -4 * wordSize))); 2469 } 2470 } 2471 2472 void MacroAssembler::pop_CPU_state(bool restore_vectors) { 2473 if (!restore_vectors) { 2474 for (int i = 0; i < 32; i += 2) 2475 ldpd(as_FloatRegister(i), as_FloatRegister(i+1), 2476 Address(post(sp, 2 * wordSize))); 2477 } else { 2478 for (int i = 0; i < 32; i += 2) 2479 ldpq(as_FloatRegister(i), as_FloatRegister(i+1), 2480 Address(post(sp, 4 * wordSize))); 2481 } 2482 2483 pop(0x3fffffff, sp); // integer registers except lr & sp 2484 } 2485 2486 /** 2487 * Helpers for multiply_to_len(). 2488 */ 2489 void MacroAssembler::add2_with_carry(Register final_dest_hi, Register dest_hi, Register dest_lo, 2490 Register src1, Register src2) { 2491 adds(dest_lo, dest_lo, src1); 2492 adc(dest_hi, dest_hi, zr); 2493 adds(dest_lo, dest_lo, src2); 2494 adc(final_dest_hi, dest_hi, zr); 2495 } 2496 2497 // Generate an address from (r + r1 extend offset). "size" is the 2498 // size of the operand. The result may be in rscratch2. 2499 Address MacroAssembler::offsetted_address(Register r, Register r1, 2500 Address::extend ext, int offset, int size) { 2501 if (offset || (ext.shift() % size != 0)) { 2502 lea(rscratch2, Address(r, r1, ext)); 2503 return Address(rscratch2, offset); 2504 } else { 2505 return Address(r, r1, ext); 2506 } 2507 } 2508 2509 Address MacroAssembler::spill_address(int size, int offset, Register tmp) 2510 { 2511 assert(offset >= 0, "spill to negative address?"); 2512 // Offset reachable ? 2513 // Not aligned - 9 bits signed offset 2514 // Aligned - 12 bits unsigned offset shifted 2515 Register base = sp; 2516 if ((offset & (size-1)) && offset >= (1<<8)) { 2517 add(tmp, base, offset & ((1<<12)-1)); 2518 base = tmp; 2519 offset &= -1<<12; 2520 } 2521 2522 if (offset >= (1<<12) * size) { 2523 add(tmp, base, offset & (((1<<12)-1)<<12)); 2524 base = tmp; 2525 offset &= ~(((1<<12)-1)<<12); 2526 } 2527 2528 return Address(base, offset); 2529 } 2530 2531 /** 2532 * Multiply 64 bit by 64 bit first loop. 2533 */ 2534 void MacroAssembler::multiply_64_x_64_loop(Register x, Register xstart, Register x_xstart, 2535 Register y, Register y_idx, Register z, 2536 Register carry, Register product, 2537 Register idx, Register kdx) { 2538 // 2539 // jlong carry, x[], y[], z[]; 2540 // for (int idx=ystart, kdx=ystart+1+xstart; idx >= 0; idx-, kdx--) { 2541 // huge_128 product = y[idx] * x[xstart] + carry; 2542 // z[kdx] = (jlong)product; 2543 // carry = (jlong)(product >>> 64); 2544 // } 2545 // z[xstart] = carry; 2546 // 2547 2548 Label L_first_loop, L_first_loop_exit; 2549 Label L_one_x, L_one_y, L_multiply; 2550 2551 subsw(xstart, xstart, 1); 2552 br(Assembler::MI, L_one_x); 2553 2554 lea(rscratch1, Address(x, xstart, Address::lsl(LogBytesPerInt))); 2555 ldr(x_xstart, Address(rscratch1)); 2556 ror(x_xstart, x_xstart, 32); // convert big-endian to little-endian 2557 2558 bind(L_first_loop); 2559 subsw(idx, idx, 1); 2560 br(Assembler::MI, L_first_loop_exit); 2561 subsw(idx, idx, 1); 2562 br(Assembler::MI, L_one_y); 2563 lea(rscratch1, Address(y, idx, Address::uxtw(LogBytesPerInt))); 2564 ldr(y_idx, Address(rscratch1)); 2565 ror(y_idx, y_idx, 32); // convert big-endian to little-endian 2566 bind(L_multiply); 2567 2568 // AArch64 has a multiply-accumulate instruction that we can't use 2569 // here because it has no way to process carries, so we have to use 2570 // separate add and adc instructions. Bah. 2571 umulh(rscratch1, x_xstart, y_idx); // x_xstart * y_idx -> rscratch1:product 2572 mul(product, x_xstart, y_idx); 2573 adds(product, product, carry); 2574 adc(carry, rscratch1, zr); // x_xstart * y_idx + carry -> carry:product 2575 2576 subw(kdx, kdx, 2); 2577 ror(product, product, 32); // back to big-endian 2578 str(product, offsetted_address(z, kdx, Address::uxtw(LogBytesPerInt), 0, BytesPerLong)); 2579 2580 b(L_first_loop); 2581 2582 bind(L_one_y); 2583 ldrw(y_idx, Address(y, 0)); 2584 b(L_multiply); 2585 2586 bind(L_one_x); 2587 ldrw(x_xstart, Address(x, 0)); 2588 b(L_first_loop); 2589 2590 bind(L_first_loop_exit); 2591 } 2592 2593 /** 2594 * Multiply 128 bit by 128. Unrolled inner loop. 2595 * 2596 */ 2597 void MacroAssembler::multiply_128_x_128_loop(Register y, Register z, 2598 Register carry, Register carry2, 2599 Register idx, Register jdx, 2600 Register yz_idx1, Register yz_idx2, 2601 Register tmp, Register tmp3, Register tmp4, 2602 Register tmp6, Register product_hi) { 2603 2604 // jlong carry, x[], y[], z[]; 2605 // int kdx = ystart+1; 2606 // for (int idx=ystart-2; idx >= 0; idx -= 2) { // Third loop 2607 // huge_128 tmp3 = (y[idx+1] * product_hi) + z[kdx+idx+1] + carry; 2608 // jlong carry2 = (jlong)(tmp3 >>> 64); 2609 // huge_128 tmp4 = (y[idx] * product_hi) + z[kdx+idx] + carry2; 2610 // carry = (jlong)(tmp4 >>> 64); 2611 // z[kdx+idx+1] = (jlong)tmp3; 2612 // z[kdx+idx] = (jlong)tmp4; 2613 // } 2614 // idx += 2; 2615 // if (idx > 0) { 2616 // yz_idx1 = (y[idx] * product_hi) + z[kdx+idx] + carry; 2617 // z[kdx+idx] = (jlong)yz_idx1; 2618 // carry = (jlong)(yz_idx1 >>> 64); 2619 // } 2620 // 2621 2622 Label L_third_loop, L_third_loop_exit, L_post_third_loop_done; 2623 2624 lsrw(jdx, idx, 2); 2625 2626 bind(L_third_loop); 2627 2628 subsw(jdx, jdx, 1); 2629 br(Assembler::MI, L_third_loop_exit); 2630 subw(idx, idx, 4); 2631 2632 lea(rscratch1, Address(y, idx, Address::uxtw(LogBytesPerInt))); 2633 2634 ldp(yz_idx2, yz_idx1, Address(rscratch1, 0)); 2635 2636 lea(tmp6, Address(z, idx, Address::uxtw(LogBytesPerInt))); 2637 2638 ror(yz_idx1, yz_idx1, 32); // convert big-endian to little-endian 2639 ror(yz_idx2, yz_idx2, 32); 2640 2641 ldp(rscratch2, rscratch1, Address(tmp6, 0)); 2642 2643 mul(tmp3, product_hi, yz_idx1); // yz_idx1 * product_hi -> tmp4:tmp3 2644 umulh(tmp4, product_hi, yz_idx1); 2645 2646 ror(rscratch1, rscratch1, 32); // convert big-endian to little-endian 2647 ror(rscratch2, rscratch2, 32); 2648 2649 mul(tmp, product_hi, yz_idx2); // yz_idx2 * product_hi -> carry2:tmp 2650 umulh(carry2, product_hi, yz_idx2); 2651 2652 // propagate sum of both multiplications into carry:tmp4:tmp3 2653 adds(tmp3, tmp3, carry); 2654 adc(tmp4, tmp4, zr); 2655 adds(tmp3, tmp3, rscratch1); 2656 adcs(tmp4, tmp4, tmp); 2657 adc(carry, carry2, zr); 2658 adds(tmp4, tmp4, rscratch2); 2659 adc(carry, carry, zr); 2660 2661 ror(tmp3, tmp3, 32); // convert little-endian to big-endian 2662 ror(tmp4, tmp4, 32); 2663 stp(tmp4, tmp3, Address(tmp6, 0)); 2664 2665 b(L_third_loop); 2666 bind (L_third_loop_exit); 2667 2668 andw (idx, idx, 0x3); 2669 cbz(idx, L_post_third_loop_done); 2670 2671 Label L_check_1; 2672 subsw(idx, idx, 2); 2673 br(Assembler::MI, L_check_1); 2674 2675 lea(rscratch1, Address(y, idx, Address::uxtw(LogBytesPerInt))); 2676 ldr(yz_idx1, Address(rscratch1, 0)); 2677 ror(yz_idx1, yz_idx1, 32); 2678 mul(tmp3, product_hi, yz_idx1); // yz_idx1 * product_hi -> tmp4:tmp3 2679 umulh(tmp4, product_hi, yz_idx1); 2680 lea(rscratch1, Address(z, idx, Address::uxtw(LogBytesPerInt))); 2681 ldr(yz_idx2, Address(rscratch1, 0)); 2682 ror(yz_idx2, yz_idx2, 32); 2683 2684 add2_with_carry(carry, tmp4, tmp3, carry, yz_idx2); 2685 2686 ror(tmp3, tmp3, 32); 2687 str(tmp3, Address(rscratch1, 0)); 2688 2689 bind (L_check_1); 2690 2691 andw (idx, idx, 0x1); 2692 subsw(idx, idx, 1); 2693 br(Assembler::MI, L_post_third_loop_done); 2694 ldrw(tmp4, Address(y, idx, Address::uxtw(LogBytesPerInt))); 2695 mul(tmp3, tmp4, product_hi); // tmp4 * product_hi -> carry2:tmp3 2696 umulh(carry2, tmp4, product_hi); 2697 ldrw(tmp4, Address(z, idx, Address::uxtw(LogBytesPerInt))); 2698 2699 add2_with_carry(carry2, tmp3, tmp4, carry); 2700 2701 strw(tmp3, Address(z, idx, Address::uxtw(LogBytesPerInt))); 2702 extr(carry, carry2, tmp3, 32); 2703 2704 bind(L_post_third_loop_done); 2705 } 2706 2707 /** 2708 * Code for BigInteger::multiplyToLen() instrinsic. 2709 * 2710 * r0: x 2711 * r1: xlen 2712 * r2: y 2713 * r3: ylen 2714 * r4: z 2715 * r5: zlen 2716 * r10: tmp1 2717 * r11: tmp2 2718 * r12: tmp3 2719 * r13: tmp4 2720 * r14: tmp5 2721 * r15: tmp6 2722 * r16: tmp7 2723 * 2724 */ 2725 void MacroAssembler::multiply_to_len(Register x, Register xlen, Register y, Register ylen, 2726 Register z, Register zlen, 2727 Register tmp1, Register tmp2, Register tmp3, Register tmp4, 2728 Register tmp5, Register tmp6, Register product_hi) { 2729 2730 assert_different_registers(x, xlen, y, ylen, z, zlen, tmp1, tmp2, tmp3, tmp4, tmp5, tmp6); 2731 2732 const Register idx = tmp1; 2733 const Register kdx = tmp2; 2734 const Register xstart = tmp3; 2735 2736 const Register y_idx = tmp4; 2737 const Register carry = tmp5; 2738 const Register product = xlen; 2739 const Register x_xstart = zlen; // reuse register 2740 2741 // First Loop. 2742 // 2743 // final static long LONG_MASK = 0xffffffffL; 2744 // int xstart = xlen - 1; 2745 // int ystart = ylen - 1; 2746 // long carry = 0; 2747 // for (int idx=ystart, kdx=ystart+1+xstart; idx >= 0; idx-, kdx--) { 2748 // long product = (y[idx] & LONG_MASK) * (x[xstart] & LONG_MASK) + carry; 2749 // z[kdx] = (int)product; 2750 // carry = product >>> 32; 2751 // } 2752 // z[xstart] = (int)carry; 2753 // 2754 2755 movw(idx, ylen); // idx = ylen; 2756 movw(kdx, zlen); // kdx = xlen+ylen; 2757 mov(carry, zr); // carry = 0; 2758 2759 Label L_done; 2760 2761 movw(xstart, xlen); 2762 subsw(xstart, xstart, 1); 2763 br(Assembler::MI, L_done); 2764 2765 multiply_64_x_64_loop(x, xstart, x_xstart, y, y_idx, z, carry, product, idx, kdx); 2766 2767 Label L_second_loop; 2768 cbzw(kdx, L_second_loop); 2769 2770 Label L_carry; 2771 subw(kdx, kdx, 1); 2772 cbzw(kdx, L_carry); 2773 2774 strw(carry, Address(z, kdx, Address::uxtw(LogBytesPerInt))); 2775 lsr(carry, carry, 32); 2776 subw(kdx, kdx, 1); 2777 2778 bind(L_carry); 2779 strw(carry, Address(z, kdx, Address::uxtw(LogBytesPerInt))); 2780 2781 // Second and third (nested) loops. 2782 // 2783 // for (int i = xstart-1; i >= 0; i--) { // Second loop 2784 // carry = 0; 2785 // for (int jdx=ystart, k=ystart+1+i; jdx >= 0; jdx--, k--) { // Third loop 2786 // long product = (y[jdx] & LONG_MASK) * (x[i] & LONG_MASK) + 2787 // (z[k] & LONG_MASK) + carry; 2788 // z[k] = (int)product; 2789 // carry = product >>> 32; 2790 // } 2791 // z[i] = (int)carry; 2792 // } 2793 // 2794 // i = xlen, j = tmp1, k = tmp2, carry = tmp5, x[i] = product_hi 2795 2796 const Register jdx = tmp1; 2797 2798 bind(L_second_loop); 2799 mov(carry, zr); // carry = 0; 2800 movw(jdx, ylen); // j = ystart+1 2801 2802 subsw(xstart, xstart, 1); // i = xstart-1; 2803 br(Assembler::MI, L_done); 2804 2805 str(z, Address(pre(sp, -4 * wordSize))); 2806 2807 Label L_last_x; 2808 lea(z, offsetted_address(z, xstart, Address::uxtw(LogBytesPerInt), 4, BytesPerInt)); // z = z + k - j 2809 subsw(xstart, xstart, 1); // i = xstart-1; 2810 br(Assembler::MI, L_last_x); 2811 2812 lea(rscratch1, Address(x, xstart, Address::uxtw(LogBytesPerInt))); 2813 ldr(product_hi, Address(rscratch1)); 2814 ror(product_hi, product_hi, 32); // convert big-endian to little-endian 2815 2816 Label L_third_loop_prologue; 2817 bind(L_third_loop_prologue); 2818 2819 str(ylen, Address(sp, wordSize)); 2820 stp(x, xstart, Address(sp, 2 * wordSize)); 2821 multiply_128_x_128_loop(y, z, carry, x, jdx, ylen, product, 2822 tmp2, x_xstart, tmp3, tmp4, tmp6, product_hi); 2823 ldp(z, ylen, Address(post(sp, 2 * wordSize))); 2824 ldp(x, xlen, Address(post(sp, 2 * wordSize))); // copy old xstart -> xlen 2825 2826 addw(tmp3, xlen, 1); 2827 strw(carry, Address(z, tmp3, Address::uxtw(LogBytesPerInt))); 2828 subsw(tmp3, tmp3, 1); 2829 br(Assembler::MI, L_done); 2830 2831 lsr(carry, carry, 32); 2832 strw(carry, Address(z, tmp3, Address::uxtw(LogBytesPerInt))); 2833 b(L_second_loop); 2834 2835 // Next infrequent code is moved outside loops. 2836 bind(L_last_x); 2837 ldrw(product_hi, Address(x, 0)); 2838 b(L_third_loop_prologue); 2839 2840 bind(L_done); 2841 } 2842 2843 /** 2844 * Emits code to update CRC-32 with a byte value according to constants in table 2845 * 2846 * @param [in,out]crc Register containing the crc. 2847 * @param [in]val Register containing the byte to fold into the CRC. 2848 * @param [in]table Register containing the table of crc constants. 2849 * 2850 * uint32_t crc; 2851 * val = crc_table[(val ^ crc) & 0xFF]; 2852 * crc = val ^ (crc >> 8); 2853 * 2854 */ 2855 void MacroAssembler::update_byte_crc32(Register crc, Register val, Register table) { 2856 eor(val, val, crc); 2857 andr(val, val, 0xff); 2858 ldrw(val, Address(table, val, Address::lsl(2))); 2859 eor(crc, val, crc, Assembler::LSR, 8); 2860 } 2861 2862 /** 2863 * Emits code to update CRC-32 with a 32-bit value according to tables 0 to 3 2864 * 2865 * @param [in,out]crc Register containing the crc. 2866 * @param [in]v Register containing the 32-bit to fold into the CRC. 2867 * @param [in]table0 Register containing table 0 of crc constants. 2868 * @param [in]table1 Register containing table 1 of crc constants. 2869 * @param [in]table2 Register containing table 2 of crc constants. 2870 * @param [in]table3 Register containing table 3 of crc constants. 2871 * 2872 * uint32_t crc; 2873 * v = crc ^ v 2874 * crc = table3[v&0xff]^table2[(v>>8)&0xff]^table1[(v>>16)&0xff]^table0[v>>24] 2875 * 2876 */ 2877 void MacroAssembler::update_word_crc32(Register crc, Register v, Register tmp, 2878 Register table0, Register table1, Register table2, Register table3, 2879 bool upper) { 2880 eor(v, crc, v, upper ? LSR:LSL, upper ? 32:0); 2881 uxtb(tmp, v); 2882 ldrw(crc, Address(table3, tmp, Address::lsl(2))); 2883 ubfx(tmp, v, 8, 8); 2884 ldrw(tmp, Address(table2, tmp, Address::lsl(2))); 2885 eor(crc, crc, tmp); 2886 ubfx(tmp, v, 16, 8); 2887 ldrw(tmp, Address(table1, tmp, Address::lsl(2))); 2888 eor(crc, crc, tmp); 2889 ubfx(tmp, v, 24, 8); 2890 ldrw(tmp, Address(table0, tmp, Address::lsl(2))); 2891 eor(crc, crc, tmp); 2892 } 2893 2894 /** 2895 * @param crc register containing existing CRC (32-bit) 2896 * @param buf register pointing to input byte buffer (byte*) 2897 * @param len register containing number of bytes 2898 * @param table register that will contain address of CRC table 2899 * @param tmp scratch register 2900 */ 2901 void MacroAssembler::kernel_crc32(Register crc, Register buf, Register len, 2902 Register table0, Register table1, Register table2, Register table3, 2903 Register tmp, Register tmp2, Register tmp3) { 2904 Label L_by16, L_by16_loop, L_by4, L_by4_loop, L_by1, L_by1_loop, L_exit; 2905 unsigned long offset; 2906 2907 ornw(crc, zr, crc); 2908 2909 if (UseCRC32) { 2910 Label CRC_by64_loop, CRC_by4_loop, CRC_by1_loop; 2911 2912 subs(len, len, 64); 2913 br(Assembler::GE, CRC_by64_loop); 2914 adds(len, len, 64-4); 2915 br(Assembler::GE, CRC_by4_loop); 2916 adds(len, len, 4); 2917 br(Assembler::GT, CRC_by1_loop); 2918 b(L_exit); 2919 2920 BIND(CRC_by4_loop); 2921 ldrw(tmp, Address(post(buf, 4))); 2922 subs(len, len, 4); 2923 crc32w(crc, crc, tmp); 2924 br(Assembler::GE, CRC_by4_loop); 2925 adds(len, len, 4); 2926 br(Assembler::LE, L_exit); 2927 BIND(CRC_by1_loop); 2928 ldrb(tmp, Address(post(buf, 1))); 2929 subs(len, len, 1); 2930 crc32b(crc, crc, tmp); 2931 br(Assembler::GT, CRC_by1_loop); 2932 b(L_exit); 2933 2934 align(CodeEntryAlignment); 2935 BIND(CRC_by64_loop); 2936 subs(len, len, 64); 2937 ldp(tmp, tmp3, Address(post(buf, 16))); 2938 crc32x(crc, crc, tmp); 2939 crc32x(crc, crc, tmp3); 2940 ldp(tmp, tmp3, Address(post(buf, 16))); 2941 crc32x(crc, crc, tmp); 2942 crc32x(crc, crc, tmp3); 2943 ldp(tmp, tmp3, Address(post(buf, 16))); 2944 crc32x(crc, crc, tmp); 2945 crc32x(crc, crc, tmp3); 2946 ldp(tmp, tmp3, Address(post(buf, 16))); 2947 crc32x(crc, crc, tmp); 2948 crc32x(crc, crc, tmp3); 2949 br(Assembler::GE, CRC_by64_loop); 2950 adds(len, len, 64-4); 2951 br(Assembler::GE, CRC_by4_loop); 2952 adds(len, len, 4); 2953 br(Assembler::GT, CRC_by1_loop); 2954 BIND(L_exit); 2955 ornw(crc, zr, crc); 2956 return; 2957 } 2958 2959 adrp(table0, ExternalAddress(StubRoutines::crc_table_addr()), offset); 2960 if (offset) add(table0, table0, offset); 2961 add(table1, table0, 1*256*sizeof(juint)); 2962 add(table2, table0, 2*256*sizeof(juint)); 2963 add(table3, table0, 3*256*sizeof(juint)); 2964 2965 if (UseNeon) { 2966 cmp(len, 64); 2967 br(Assembler::LT, L_by16); 2968 eor(v16, T16B, v16, v16); 2969 2970 Label L_fold; 2971 2972 add(tmp, table0, 4*256*sizeof(juint)); // Point at the Neon constants 2973 2974 ld1(v0, v1, T2D, post(buf, 32)); 2975 ld1r(v4, T2D, post(tmp, 8)); 2976 ld1r(v5, T2D, post(tmp, 8)); 2977 ld1r(v6, T2D, post(tmp, 8)); 2978 ld1r(v7, T2D, post(tmp, 8)); 2979 mov(v16, T4S, 0, crc); 2980 2981 eor(v0, T16B, v0, v16); 2982 sub(len, len, 64); 2983 2984 BIND(L_fold); 2985 pmull(v22, T8H, v0, v5, T8B); 2986 pmull(v20, T8H, v0, v7, T8B); 2987 pmull(v23, T8H, v0, v4, T8B); 2988 pmull(v21, T8H, v0, v6, T8B); 2989 2990 pmull2(v18, T8H, v0, v5, T16B); 2991 pmull2(v16, T8H, v0, v7, T16B); 2992 pmull2(v19, T8H, v0, v4, T16B); 2993 pmull2(v17, T8H, v0, v6, T16B); 2994 2995 uzp1(v24, v20, v22, T8H); 2996 uzp2(v25, v20, v22, T8H); 2997 eor(v20, T16B, v24, v25); 2998 2999 uzp1(v26, v16, v18, T8H); 3000 uzp2(v27, v16, v18, T8H); 3001 eor(v16, T16B, v26, v27); 3002 3003 ushll2(v22, T4S, v20, T8H, 8); 3004 ushll(v20, T4S, v20, T4H, 8); 3005 3006 ushll2(v18, T4S, v16, T8H, 8); 3007 ushll(v16, T4S, v16, T4H, 8); 3008 3009 eor(v22, T16B, v23, v22); 3010 eor(v18, T16B, v19, v18); 3011 eor(v20, T16B, v21, v20); 3012 eor(v16, T16B, v17, v16); 3013 3014 uzp1(v17, v16, v20, T2D); 3015 uzp2(v21, v16, v20, T2D); 3016 eor(v17, T16B, v17, v21); 3017 3018 ushll2(v20, T2D, v17, T4S, 16); 3019 ushll(v16, T2D, v17, T2S, 16); 3020 3021 eor(v20, T16B, v20, v22); 3022 eor(v16, T16B, v16, v18); 3023 3024 uzp1(v17, v20, v16, T2D); 3025 uzp2(v21, v20, v16, T2D); 3026 eor(v28, T16B, v17, v21); 3027 3028 pmull(v22, T8H, v1, v5, T8B); 3029 pmull(v20, T8H, v1, v7, T8B); 3030 pmull(v23, T8H, v1, v4, T8B); 3031 pmull(v21, T8H, v1, v6, T8B); 3032 3033 pmull2(v18, T8H, v1, v5, T16B); 3034 pmull2(v16, T8H, v1, v7, T16B); 3035 pmull2(v19, T8H, v1, v4, T16B); 3036 pmull2(v17, T8H, v1, v6, T16B); 3037 3038 ld1(v0, v1, T2D, post(buf, 32)); 3039 3040 uzp1(v24, v20, v22, T8H); 3041 uzp2(v25, v20, v22, T8H); 3042 eor(v20, T16B, v24, v25); 3043 3044 uzp1(v26, v16, v18, T8H); 3045 uzp2(v27, v16, v18, T8H); 3046 eor(v16, T16B, v26, v27); 3047 3048 ushll2(v22, T4S, v20, T8H, 8); 3049 ushll(v20, T4S, v20, T4H, 8); 3050 3051 ushll2(v18, T4S, v16, T8H, 8); 3052 ushll(v16, T4S, v16, T4H, 8); 3053 3054 eor(v22, T16B, v23, v22); 3055 eor(v18, T16B, v19, v18); 3056 eor(v20, T16B, v21, v20); 3057 eor(v16, T16B, v17, v16); 3058 3059 uzp1(v17, v16, v20, T2D); 3060 uzp2(v21, v16, v20, T2D); 3061 eor(v16, T16B, v17, v21); 3062 3063 ushll2(v20, T2D, v16, T4S, 16); 3064 ushll(v16, T2D, v16, T2S, 16); 3065 3066 eor(v20, T16B, v22, v20); 3067 eor(v16, T16B, v16, v18); 3068 3069 uzp1(v17, v20, v16, T2D); 3070 uzp2(v21, v20, v16, T2D); 3071 eor(v20, T16B, v17, v21); 3072 3073 shl(v16, T2D, v28, 1); 3074 shl(v17, T2D, v20, 1); 3075 3076 eor(v0, T16B, v0, v16); 3077 eor(v1, T16B, v1, v17); 3078 3079 subs(len, len, 32); 3080 br(Assembler::GE, L_fold); 3081 3082 mov(crc, 0); 3083 mov(tmp, v0, T1D, 0); 3084 update_word_crc32(crc, tmp, tmp2, table0, table1, table2, table3, false); 3085 update_word_crc32(crc, tmp, tmp2, table0, table1, table2, table3, true); 3086 mov(tmp, v0, T1D, 1); 3087 update_word_crc32(crc, tmp, tmp2, table0, table1, table2, table3, false); 3088 update_word_crc32(crc, tmp, tmp2, table0, table1, table2, table3, true); 3089 mov(tmp, v1, T1D, 0); 3090 update_word_crc32(crc, tmp, tmp2, table0, table1, table2, table3, false); 3091 update_word_crc32(crc, tmp, tmp2, table0, table1, table2, table3, true); 3092 mov(tmp, v1, T1D, 1); 3093 update_word_crc32(crc, tmp, tmp2, table0, table1, table2, table3, false); 3094 update_word_crc32(crc, tmp, tmp2, table0, table1, table2, table3, true); 3095 3096 add(len, len, 32); 3097 } 3098 3099 BIND(L_by16); 3100 subs(len, len, 16); 3101 br(Assembler::GE, L_by16_loop); 3102 adds(len, len, 16-4); 3103 br(Assembler::GE, L_by4_loop); 3104 adds(len, len, 4); 3105 br(Assembler::GT, L_by1_loop); 3106 b(L_exit); 3107 3108 BIND(L_by4_loop); 3109 ldrw(tmp, Address(post(buf, 4))); 3110 update_word_crc32(crc, tmp, tmp2, table0, table1, table2, table3); 3111 subs(len, len, 4); 3112 br(Assembler::GE, L_by4_loop); 3113 adds(len, len, 4); 3114 br(Assembler::LE, L_exit); 3115 BIND(L_by1_loop); 3116 subs(len, len, 1); 3117 ldrb(tmp, Address(post(buf, 1))); 3118 update_byte_crc32(crc, tmp, table0); 3119 br(Assembler::GT, L_by1_loop); 3120 b(L_exit); 3121 3122 align(CodeEntryAlignment); 3123 BIND(L_by16_loop); 3124 subs(len, len, 16); 3125 ldp(tmp, tmp3, Address(post(buf, 16))); 3126 update_word_crc32(crc, tmp, tmp2, table0, table1, table2, table3, false); 3127 update_word_crc32(crc, tmp, tmp2, table0, table1, table2, table3, true); 3128 update_word_crc32(crc, tmp3, tmp2, table0, table1, table2, table3, false); 3129 update_word_crc32(crc, tmp3, tmp2, table0, table1, table2, table3, true); 3130 br(Assembler::GE, L_by16_loop); 3131 adds(len, len, 16-4); 3132 br(Assembler::GE, L_by4_loop); 3133 adds(len, len, 4); 3134 br(Assembler::GT, L_by1_loop); 3135 BIND(L_exit); 3136 ornw(crc, zr, crc); 3137 } 3138 3139 /** 3140 * @param crc register containing existing CRC (32-bit) 3141 * @param buf register pointing to input byte buffer (byte*) 3142 * @param len register containing number of bytes 3143 * @param table register that will contain address of CRC table 3144 * @param tmp scratch register 3145 */ 3146 void MacroAssembler::kernel_crc32c(Register crc, Register buf, Register len, 3147 Register table0, Register table1, Register table2, Register table3, 3148 Register tmp, Register tmp2, Register tmp3) { 3149 Label L_exit; 3150 Label CRC_by64_loop, CRC_by4_loop, CRC_by1_loop; 3151 3152 subs(len, len, 64); 3153 br(Assembler::GE, CRC_by64_loop); 3154 adds(len, len, 64-4); 3155 br(Assembler::GE, CRC_by4_loop); 3156 adds(len, len, 4); 3157 br(Assembler::GT, CRC_by1_loop); 3158 b(L_exit); 3159 3160 BIND(CRC_by4_loop); 3161 ldrw(tmp, Address(post(buf, 4))); 3162 subs(len, len, 4); 3163 crc32cw(crc, crc, tmp); 3164 br(Assembler::GE, CRC_by4_loop); 3165 adds(len, len, 4); 3166 br(Assembler::LE, L_exit); 3167 BIND(CRC_by1_loop); 3168 ldrb(tmp, Address(post(buf, 1))); 3169 subs(len, len, 1); 3170 crc32cb(crc, crc, tmp); 3171 br(Assembler::GT, CRC_by1_loop); 3172 b(L_exit); 3173 3174 align(CodeEntryAlignment); 3175 BIND(CRC_by64_loop); 3176 subs(len, len, 64); 3177 ldp(tmp, tmp3, Address(post(buf, 16))); 3178 crc32cx(crc, crc, tmp); 3179 crc32cx(crc, crc, tmp3); 3180 ldp(tmp, tmp3, Address(post(buf, 16))); 3181 crc32cx(crc, crc, tmp); 3182 crc32cx(crc, crc, tmp3); 3183 ldp(tmp, tmp3, Address(post(buf, 16))); 3184 crc32cx(crc, crc, tmp); 3185 crc32cx(crc, crc, tmp3); 3186 ldp(tmp, tmp3, Address(post(buf, 16))); 3187 crc32cx(crc, crc, tmp); 3188 crc32cx(crc, crc, tmp3); 3189 br(Assembler::GE, CRC_by64_loop); 3190 adds(len, len, 64-4); 3191 br(Assembler::GE, CRC_by4_loop); 3192 adds(len, len, 4); 3193 br(Assembler::GT, CRC_by1_loop); 3194 BIND(L_exit); 3195 return; 3196 } 3197 3198 SkipIfEqual::SkipIfEqual( 3199 MacroAssembler* masm, const bool* flag_addr, bool value) { 3200 _masm = masm; 3201 unsigned long offset; 3202 _masm->adrp(rscratch1, ExternalAddress((address)flag_addr), offset); 3203 _masm->ldrb(rscratch1, Address(rscratch1, offset)); 3204 _masm->cbzw(rscratch1, _label); 3205 } 3206 3207 SkipIfEqual::~SkipIfEqual() { 3208 _masm->bind(_label); 3209 } 3210 3211 void MacroAssembler::addptr(const Address &dst, int32_t src) { 3212 Address adr; 3213 switch(dst.getMode()) { 3214 case Address::base_plus_offset: 3215 // This is the expected mode, although we allow all the other 3216 // forms below. 3217 adr = form_address(rscratch2, dst.base(), dst.offset(), LogBytesPerWord); 3218 break; 3219 default: 3220 lea(rscratch2, dst); 3221 adr = Address(rscratch2); 3222 break; 3223 } 3224 ldr(rscratch1, adr); 3225 add(rscratch1, rscratch1, src); 3226 str(rscratch1, adr); 3227 } 3228 3229 void MacroAssembler::cmpptr(Register src1, Address src2) { 3230 unsigned long offset; 3231 adrp(rscratch1, src2, offset); 3232 ldr(rscratch1, Address(rscratch1, offset)); 3233 cmp(src1, rscratch1); 3234 } 3235 3236 void MacroAssembler::store_check(Register obj, Address dst) { 3237 store_check(obj); 3238 } 3239 3240 void MacroAssembler::store_check(Register obj) { 3241 // Does a store check for the oop in register obj. The content of 3242 // register obj is destroyed afterwards. 3243 3244 BarrierSet* bs = Universe::heap()->barrier_set(); 3245 assert(bs->kind() == BarrierSet::CardTableForRS || 3246 bs->kind() == BarrierSet::CardTableExtension, 3247 "Wrong barrier set kind"); 3248 3249 CardTableModRefBS* ct = barrier_set_cast<CardTableModRefBS>(bs); 3250 assert(sizeof(*ct->byte_map_base) == sizeof(jbyte), "adjust this code"); 3251 3252 lsr(obj, obj, CardTableModRefBS::card_shift); 3253 3254 assert(CardTableModRefBS::dirty_card_val() == 0, "must be"); 3255 3256 load_byte_map_base(rscratch1); 3257 3258 if (UseCondCardMark) { 3259 Label L_already_dirty; 3260 membar(StoreLoad); 3261 ldrb(rscratch2, Address(obj, rscratch1)); 3262 cbz(rscratch2, L_already_dirty); 3263 strb(zr, Address(obj, rscratch1)); 3264 bind(L_already_dirty); 3265 } else { 3266 if (UseConcMarkSweepGC && CMSPrecleaningEnabled) { 3267 membar(StoreStore); 3268 } 3269 strb(zr, Address(obj, rscratch1)); 3270 } 3271 } 3272 3273 void MacroAssembler::load_klass(Register dst, Register src) { 3274 if (UseCompressedClassPointers) { 3275 ldrw(dst, Address(src, oopDesc::klass_offset_in_bytes())); 3276 decode_klass_not_null(dst); 3277 } else { 3278 ldr(dst, Address(src, oopDesc::klass_offset_in_bytes())); 3279 } 3280 } 3281 3282 void MacroAssembler::load_mirror(Register dst, Register method) { 3283 const int mirror_offset = in_bytes(Klass::java_mirror_offset()); 3284 ldr(dst, Address(rmethod, Method::const_offset())); 3285 ldr(dst, Address(dst, ConstMethod::constants_offset())); 3286 ldr(dst, Address(dst, ConstantPool::pool_holder_offset_in_bytes())); 3287 ldr(dst, Address(dst, mirror_offset)); 3288 } 3289 3290 void MacroAssembler::cmp_klass(Register oop, Register trial_klass, Register tmp) { 3291 if (UseCompressedClassPointers) { 3292 ldrw(tmp, Address(oop, oopDesc::klass_offset_in_bytes())); 3293 if (Universe::narrow_klass_base() == NULL) { 3294 cmp(trial_klass, tmp, LSL, Universe::narrow_klass_shift()); 3295 return; 3296 } else if (((uint64_t)Universe::narrow_klass_base() & 0xffffffff) == 0 3297 && Universe::narrow_klass_shift() == 0) { 3298 // Only the bottom 32 bits matter 3299 cmpw(trial_klass, tmp); 3300 return; 3301 } 3302 decode_klass_not_null(tmp); 3303 } else { 3304 ldr(tmp, Address(oop, oopDesc::klass_offset_in_bytes())); 3305 } 3306 cmp(trial_klass, tmp); 3307 } 3308 3309 void MacroAssembler::load_prototype_header(Register dst, Register src) { 3310 load_klass(dst, src); 3311 ldr(dst, Address(dst, Klass::prototype_header_offset())); 3312 } 3313 3314 void MacroAssembler::store_klass(Register dst, Register src) { 3315 // FIXME: Should this be a store release? concurrent gcs assumes 3316 // klass length is valid if klass field is not null. 3317 if (UseCompressedClassPointers) { 3318 encode_klass_not_null(src); 3319 strw(src, Address(dst, oopDesc::klass_offset_in_bytes())); 3320 } else { 3321 str(src, Address(dst, oopDesc::klass_offset_in_bytes())); 3322 } 3323 } 3324 3325 void MacroAssembler::store_klass_gap(Register dst, Register src) { 3326 if (UseCompressedClassPointers) { 3327 // Store to klass gap in destination 3328 strw(src, Address(dst, oopDesc::klass_gap_offset_in_bytes())); 3329 } 3330 } 3331 3332 // Algorithm must match oop.inline.hpp encode_heap_oop. 3333 void MacroAssembler::encode_heap_oop(Register d, Register s) { 3334 #ifdef ASSERT 3335 verify_heapbase("MacroAssembler::encode_heap_oop: heap base corrupted?"); 3336 #endif 3337 verify_oop(s, "broken oop in encode_heap_oop"); 3338 if (Universe::narrow_oop_base() == NULL) { 3339 if (Universe::narrow_oop_shift() != 0) { 3340 assert (LogMinObjAlignmentInBytes == Universe::narrow_oop_shift(), "decode alg wrong"); 3341 lsr(d, s, LogMinObjAlignmentInBytes); 3342 } else { 3343 mov(d, s); 3344 } 3345 } else { 3346 subs(d, s, rheapbase); 3347 csel(d, d, zr, Assembler::HS); 3348 lsr(d, d, LogMinObjAlignmentInBytes); 3349 3350 /* Old algorithm: is this any worse? 3351 Label nonnull; 3352 cbnz(r, nonnull); 3353 sub(r, r, rheapbase); 3354 bind(nonnull); 3355 lsr(r, r, LogMinObjAlignmentInBytes); 3356 */ 3357 } 3358 } 3359 3360 void MacroAssembler::encode_heap_oop_not_null(Register r) { 3361 #ifdef ASSERT 3362 verify_heapbase("MacroAssembler::encode_heap_oop_not_null: heap base corrupted?"); 3363 if (CheckCompressedOops) { 3364 Label ok; 3365 cbnz(r, ok); 3366 stop("null oop passed to encode_heap_oop_not_null"); 3367 bind(ok); 3368 } 3369 #endif 3370 verify_oop(r, "broken oop in encode_heap_oop_not_null"); 3371 if (Universe::narrow_oop_base() != NULL) { 3372 sub(r, r, rheapbase); 3373 } 3374 if (Universe::narrow_oop_shift() != 0) { 3375 assert (LogMinObjAlignmentInBytes == Universe::narrow_oop_shift(), "decode alg wrong"); 3376 lsr(r, r, LogMinObjAlignmentInBytes); 3377 } 3378 } 3379 3380 void MacroAssembler::encode_heap_oop_not_null(Register dst, Register src) { 3381 #ifdef ASSERT 3382 verify_heapbase("MacroAssembler::encode_heap_oop_not_null2: heap base corrupted?"); 3383 if (CheckCompressedOops) { 3384 Label ok; 3385 cbnz(src, ok); 3386 stop("null oop passed to encode_heap_oop_not_null2"); 3387 bind(ok); 3388 } 3389 #endif 3390 verify_oop(src, "broken oop in encode_heap_oop_not_null2"); 3391 3392 Register data = src; 3393 if (Universe::narrow_oop_base() != NULL) { 3394 sub(dst, src, rheapbase); 3395 data = dst; 3396 } 3397 if (Universe::narrow_oop_shift() != 0) { 3398 assert (LogMinObjAlignmentInBytes == Universe::narrow_oop_shift(), "decode alg wrong"); 3399 lsr(dst, data, LogMinObjAlignmentInBytes); 3400 data = dst; 3401 } 3402 if (data == src) 3403 mov(dst, src); 3404 } 3405 3406 void MacroAssembler::decode_heap_oop(Register d, Register s) { 3407 #ifdef ASSERT 3408 verify_heapbase("MacroAssembler::decode_heap_oop: heap base corrupted?"); 3409 #endif 3410 if (Universe::narrow_oop_base() == NULL) { 3411 if (Universe::narrow_oop_shift() != 0 || d != s) { 3412 lsl(d, s, Universe::narrow_oop_shift()); 3413 } 3414 } else { 3415 Label done; 3416 if (d != s) 3417 mov(d, s); 3418 cbz(s, done); 3419 add(d, rheapbase, s, Assembler::LSL, LogMinObjAlignmentInBytes); 3420 bind(done); 3421 } 3422 verify_oop(d, "broken oop in decode_heap_oop"); 3423 } 3424 3425 void MacroAssembler::decode_heap_oop_not_null(Register r) { 3426 assert (UseCompressedOops, "should only be used for compressed headers"); 3427 assert (Universe::heap() != NULL, "java heap should be initialized"); 3428 // Cannot assert, unverified entry point counts instructions (see .ad file) 3429 // vtableStubs also counts instructions in pd_code_size_limit. 3430 // Also do not verify_oop as this is called by verify_oop. 3431 if (Universe::narrow_oop_shift() != 0) { 3432 assert(LogMinObjAlignmentInBytes == Universe::narrow_oop_shift(), "decode alg wrong"); 3433 if (Universe::narrow_oop_base() != NULL) { 3434 add(r, rheapbase, r, Assembler::LSL, LogMinObjAlignmentInBytes); 3435 } else { 3436 add(r, zr, r, Assembler::LSL, LogMinObjAlignmentInBytes); 3437 } 3438 } else { 3439 assert (Universe::narrow_oop_base() == NULL, "sanity"); 3440 } 3441 } 3442 3443 void MacroAssembler::decode_heap_oop_not_null(Register dst, Register src) { 3444 assert (UseCompressedOops, "should only be used for compressed headers"); 3445 assert (Universe::heap() != NULL, "java heap should be initialized"); 3446 // Cannot assert, unverified entry point counts instructions (see .ad file) 3447 // vtableStubs also counts instructions in pd_code_size_limit. 3448 // Also do not verify_oop as this is called by verify_oop. 3449 if (Universe::narrow_oop_shift() != 0) { 3450 assert(LogMinObjAlignmentInBytes == Universe::narrow_oop_shift(), "decode alg wrong"); 3451 if (Universe::narrow_oop_base() != NULL) { 3452 add(dst, rheapbase, src, Assembler::LSL, LogMinObjAlignmentInBytes); 3453 } else { 3454 add(dst, zr, src, Assembler::LSL, LogMinObjAlignmentInBytes); 3455 } 3456 } else { 3457 assert (Universe::narrow_oop_base() == NULL, "sanity"); 3458 if (dst != src) { 3459 mov(dst, src); 3460 } 3461 } 3462 } 3463 3464 void MacroAssembler::encode_klass_not_null(Register dst, Register src) { 3465 if (Universe::narrow_klass_base() == NULL) { 3466 if (Universe::narrow_klass_shift() != 0) { 3467 assert (LogKlassAlignmentInBytes == Universe::narrow_klass_shift(), "decode alg wrong"); 3468 lsr(dst, src, LogKlassAlignmentInBytes); 3469 } else { 3470 if (dst != src) mov(dst, src); 3471 } 3472 return; 3473 } 3474 3475 if (use_XOR_for_compressed_class_base) { 3476 if (Universe::narrow_klass_shift() != 0) { 3477 eor(dst, src, (uint64_t)Universe::narrow_klass_base()); 3478 lsr(dst, dst, LogKlassAlignmentInBytes); 3479 } else { 3480 eor(dst, src, (uint64_t)Universe::narrow_klass_base()); 3481 } 3482 return; 3483 } 3484 3485 if (((uint64_t)Universe::narrow_klass_base() & 0xffffffff) == 0 3486 && Universe::narrow_klass_shift() == 0) { 3487 movw(dst, src); 3488 return; 3489 } 3490 3491 #ifdef ASSERT 3492 verify_heapbase("MacroAssembler::encode_klass_not_null2: heap base corrupted?"); 3493 #endif 3494 3495 Register rbase = dst; 3496 if (dst == src) rbase = rheapbase; 3497 mov(rbase, (uint64_t)Universe::narrow_klass_base()); 3498 sub(dst, src, rbase); 3499 if (Universe::narrow_klass_shift() != 0) { 3500 assert (LogKlassAlignmentInBytes == Universe::narrow_klass_shift(), "decode alg wrong"); 3501 lsr(dst, dst, LogKlassAlignmentInBytes); 3502 } 3503 if (dst == src) reinit_heapbase(); 3504 } 3505 3506 void MacroAssembler::encode_klass_not_null(Register r) { 3507 encode_klass_not_null(r, r); 3508 } 3509 3510 void MacroAssembler::decode_klass_not_null(Register dst, Register src) { 3511 Register rbase = dst; 3512 assert (UseCompressedClassPointers, "should only be used for compressed headers"); 3513 3514 if (Universe::narrow_klass_base() == NULL) { 3515 if (Universe::narrow_klass_shift() != 0) { 3516 assert(LogKlassAlignmentInBytes == Universe::narrow_klass_shift(), "decode alg wrong"); 3517 lsl(dst, src, LogKlassAlignmentInBytes); 3518 } else { 3519 if (dst != src) mov(dst, src); 3520 } 3521 return; 3522 } 3523 3524 if (use_XOR_for_compressed_class_base) { 3525 if (Universe::narrow_klass_shift() != 0) { 3526 lsl(dst, src, LogKlassAlignmentInBytes); 3527 eor(dst, dst, (uint64_t)Universe::narrow_klass_base()); 3528 } else { 3529 eor(dst, src, (uint64_t)Universe::narrow_klass_base()); 3530 } 3531 return; 3532 } 3533 3534 if (((uint64_t)Universe::narrow_klass_base() & 0xffffffff) == 0 3535 && Universe::narrow_klass_shift() == 0) { 3536 if (dst != src) 3537 movw(dst, src); 3538 movk(dst, (uint64_t)Universe::narrow_klass_base() >> 32, 32); 3539 return; 3540 } 3541 3542 // Cannot assert, unverified entry point counts instructions (see .ad file) 3543 // vtableStubs also counts instructions in pd_code_size_limit. 3544 // Also do not verify_oop as this is called by verify_oop. 3545 if (dst == src) rbase = rheapbase; 3546 mov(rbase, (uint64_t)Universe::narrow_klass_base()); 3547 if (Universe::narrow_klass_shift() != 0) { 3548 assert(LogKlassAlignmentInBytes == Universe::narrow_klass_shift(), "decode alg wrong"); 3549 add(dst, rbase, src, Assembler::LSL, LogKlassAlignmentInBytes); 3550 } else { 3551 add(dst, rbase, src); 3552 } 3553 if (dst == src) reinit_heapbase(); 3554 } 3555 3556 void MacroAssembler::decode_klass_not_null(Register r) { 3557 decode_klass_not_null(r, r); 3558 } 3559 3560 void MacroAssembler::set_narrow_oop(Register dst, jobject obj) { 3561 assert (UseCompressedOops, "should only be used for compressed oops"); 3562 assert (Universe::heap() != NULL, "java heap should be initialized"); 3563 assert (oop_recorder() != NULL, "this assembler needs an OopRecorder"); 3564 3565 int oop_index = oop_recorder()->find_index(obj); 3566 assert(Universe::heap()->is_in_reserved(JNIHandles::resolve(obj)), "should be real oop"); 3567 3568 InstructionMark im(this); 3569 RelocationHolder rspec = oop_Relocation::spec(oop_index); 3570 code_section()->relocate(inst_mark(), rspec); 3571 movz(dst, 0xDEAD, 16); 3572 movk(dst, 0xBEEF); 3573 } 3574 3575 void MacroAssembler::set_narrow_klass(Register dst, Klass* k) { 3576 assert (UseCompressedClassPointers, "should only be used for compressed headers"); 3577 assert (oop_recorder() != NULL, "this assembler needs an OopRecorder"); 3578 int index = oop_recorder()->find_index(k); 3579 assert(! Universe::heap()->is_in_reserved(k), "should not be an oop"); 3580 3581 InstructionMark im(this); 3582 RelocationHolder rspec = metadata_Relocation::spec(index); 3583 code_section()->relocate(inst_mark(), rspec); 3584 narrowKlass nk = Klass::encode_klass(k); 3585 movz(dst, (nk >> 16), 16); 3586 movk(dst, nk & 0xffff); 3587 } 3588 3589 void MacroAssembler::load_heap_oop(Register dst, Address src) 3590 { 3591 if (UseCompressedOops) { 3592 ldrw(dst, src); 3593 decode_heap_oop(dst); 3594 } else { 3595 ldr(dst, src); 3596 } 3597 } 3598 3599 void MacroAssembler::load_heap_oop_not_null(Register dst, Address src) 3600 { 3601 if (UseCompressedOops) { 3602 ldrw(dst, src); 3603 decode_heap_oop_not_null(dst); 3604 } else { 3605 ldr(dst, src); 3606 } 3607 } 3608 3609 void MacroAssembler::store_heap_oop(Address dst, Register src) { 3610 if (UseCompressedOops) { 3611 assert(!dst.uses(src), "not enough registers"); 3612 encode_heap_oop(src); 3613 strw(src, dst); 3614 } else 3615 str(src, dst); 3616 } 3617 3618 // Used for storing NULLs. 3619 void MacroAssembler::store_heap_oop_null(Address dst) { 3620 if (UseCompressedOops) { 3621 strw(zr, dst); 3622 } else 3623 str(zr, dst); 3624 } 3625 3626 #if INCLUDE_ALL_GCS 3627 void MacroAssembler::g1_write_barrier_pre(Register obj, 3628 Register pre_val, 3629 Register thread, 3630 Register tmp, 3631 bool tosca_live, 3632 bool expand_call) { 3633 // If expand_call is true then we expand the call_VM_leaf macro 3634 // directly to skip generating the check by 3635 // InterpreterMacroAssembler::call_VM_leaf_base that checks _last_sp. 3636 3637 assert(thread == rthread, "must be"); 3638 3639 Label done; 3640 Label runtime; 3641 3642 assert(pre_val != noreg, "check this code"); 3643 3644 if (obj != noreg) 3645 assert_different_registers(obj, pre_val, tmp); 3646 3647 Address in_progress(thread, in_bytes(JavaThread::satb_mark_queue_offset() + 3648 SATBMarkQueue::byte_offset_of_active())); 3649 Address index(thread, in_bytes(JavaThread::satb_mark_queue_offset() + 3650 SATBMarkQueue::byte_offset_of_index())); 3651 Address buffer(thread, in_bytes(JavaThread::satb_mark_queue_offset() + 3652 SATBMarkQueue::byte_offset_of_buf())); 3653 3654 3655 // Is marking active? 3656 if (in_bytes(SATBMarkQueue::byte_width_of_active()) == 4) { 3657 ldrw(tmp, in_progress); 3658 } else { 3659 assert(in_bytes(SATBMarkQueue::byte_width_of_active()) == 1, "Assumption"); 3660 ldrb(tmp, in_progress); 3661 } 3662 cbzw(tmp, done); 3663 3664 // Do we need to load the previous value? 3665 if (obj != noreg) { 3666 load_heap_oop(pre_val, Address(obj, 0)); 3667 } 3668 3669 // Is the previous value null? 3670 cbz(pre_val, done); 3671 3672 // Can we store original value in the thread's buffer? 3673 // Is index == 0? 3674 // (The index field is typed as size_t.) 3675 3676 ldr(tmp, index); // tmp := *index_adr 3677 cbz(tmp, runtime); // tmp == 0? 3678 // If yes, goto runtime 3679 3680 sub(tmp, tmp, wordSize); // tmp := tmp - wordSize 3681 str(tmp, index); // *index_adr := tmp 3682 ldr(rscratch1, buffer); 3683 add(tmp, tmp, rscratch1); // tmp := tmp + *buffer_adr 3684 3685 // Record the previous value 3686 str(pre_val, Address(tmp, 0)); 3687 b(done); 3688 3689 bind(runtime); 3690 // save the live input values 3691 push(r0->bit(tosca_live) | obj->bit(obj != noreg) | pre_val->bit(true), sp); 3692 3693 // Calling the runtime using the regular call_VM_leaf mechanism generates 3694 // code (generated by InterpreterMacroAssember::call_VM_leaf_base) 3695 // that checks that the *(rfp+frame::interpreter_frame_last_sp) == NULL. 3696 // 3697 // If we care generating the pre-barrier without a frame (e.g. in the 3698 // intrinsified Reference.get() routine) then ebp might be pointing to 3699 // the caller frame and so this check will most likely fail at runtime. 3700 // 3701 // Expanding the call directly bypasses the generation of the check. 3702 // So when we do not have have a full interpreter frame on the stack 3703 // expand_call should be passed true. 3704 3705 if (expand_call) { 3706 assert(pre_val != c_rarg1, "smashed arg"); 3707 pass_arg1(this, thread); 3708 pass_arg0(this, pre_val); 3709 MacroAssembler::call_VM_leaf_base(CAST_FROM_FN_PTR(address, SharedRuntime::g1_wb_pre), 2); 3710 } else { 3711 call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::g1_wb_pre), pre_val, thread); 3712 } 3713 3714 pop(r0->bit(tosca_live) | obj->bit(obj != noreg) | pre_val->bit(true), sp); 3715 3716 bind(done); 3717 } 3718 3719 void MacroAssembler::g1_write_barrier_post(Register store_addr, 3720 Register new_val, 3721 Register thread, 3722 Register tmp, 3723 Register tmp2) { 3724 assert(thread == rthread, "must be"); 3725 3726 Address queue_index(thread, in_bytes(JavaThread::dirty_card_queue_offset() + 3727 DirtyCardQueue::byte_offset_of_index())); 3728 Address buffer(thread, in_bytes(JavaThread::dirty_card_queue_offset() + 3729 DirtyCardQueue::byte_offset_of_buf())); 3730 3731 BarrierSet* bs = Universe::heap()->barrier_set(); 3732 CardTableModRefBS* ct = (CardTableModRefBS*)bs; 3733 assert(sizeof(*ct->byte_map_base) == sizeof(jbyte), "adjust this code"); 3734 3735 Label done; 3736 Label runtime; 3737 3738 // Does store cross heap regions? 3739 3740 eor(tmp, store_addr, new_val); 3741 lsr(tmp, tmp, HeapRegion::LogOfHRGrainBytes); 3742 cbz(tmp, done); 3743 3744 // crosses regions, storing NULL? 3745 3746 cbz(new_val, done); 3747 3748 // storing region crossing non-NULL, is card already dirty? 3749 3750 ExternalAddress cardtable((address) ct->byte_map_base); 3751 assert(sizeof(*ct->byte_map_base) == sizeof(jbyte), "adjust this code"); 3752 const Register card_addr = tmp; 3753 3754 lsr(card_addr, store_addr, CardTableModRefBS::card_shift); 3755 3756 // get the address of the card 3757 load_byte_map_base(tmp2); 3758 add(card_addr, card_addr, tmp2); 3759 ldrb(tmp2, Address(card_addr)); 3760 cmpw(tmp2, (int)G1SATBCardTableModRefBS::g1_young_card_val()); 3761 br(Assembler::EQ, done); 3762 3763 assert((int)CardTableModRefBS::dirty_card_val() == 0, "must be 0"); 3764 3765 membar(Assembler::StoreLoad); 3766 3767 ldrb(tmp2, Address(card_addr)); 3768 cbzw(tmp2, done); 3769 3770 // storing a region crossing, non-NULL oop, card is clean. 3771 // dirty card and log. 3772 3773 strb(zr, Address(card_addr)); 3774 3775 ldr(rscratch1, queue_index); 3776 cbz(rscratch1, runtime); 3777 sub(rscratch1, rscratch1, wordSize); 3778 str(rscratch1, queue_index); 3779 3780 ldr(tmp2, buffer); 3781 str(card_addr, Address(tmp2, rscratch1)); 3782 b(done); 3783 3784 bind(runtime); 3785 // save the live input values 3786 push(store_addr->bit(true) | new_val->bit(true), sp); 3787 call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::g1_wb_post), card_addr, thread); 3788 pop(store_addr->bit(true) | new_val->bit(true), sp); 3789 3790 bind(done); 3791 } 3792 3793 #endif // INCLUDE_ALL_GCS 3794 3795 Address MacroAssembler::allocate_metadata_address(Metadata* obj) { 3796 assert(oop_recorder() != NULL, "this assembler needs a Recorder"); 3797 int index = oop_recorder()->allocate_metadata_index(obj); 3798 RelocationHolder rspec = metadata_Relocation::spec(index); 3799 return Address((address)obj, rspec); 3800 } 3801 3802 // Move an oop into a register. immediate is true if we want 3803 // immediate instrcutions, i.e. we are not going to patch this 3804 // instruction while the code is being executed by another thread. In 3805 // that case we can use move immediates rather than the constant pool. 3806 void MacroAssembler::movoop(Register dst, jobject obj, bool immediate) { 3807 int oop_index; 3808 if (obj == NULL) { 3809 oop_index = oop_recorder()->allocate_oop_index(obj); 3810 } else { 3811 oop_index = oop_recorder()->find_index(obj); 3812 assert(Universe::heap()->is_in_reserved(JNIHandles::resolve(obj)), "should be real oop"); 3813 } 3814 RelocationHolder rspec = oop_Relocation::spec(oop_index); 3815 if (! immediate) { 3816 address dummy = address(uintptr_t(pc()) & -wordSize); // A nearby aligned address 3817 ldr_constant(dst, Address(dummy, rspec)); 3818 } else 3819 mov(dst, Address((address)obj, rspec)); 3820 } 3821 3822 // Move a metadata address into a register. 3823 void MacroAssembler::mov_metadata(Register dst, Metadata* obj) { 3824 int oop_index; 3825 if (obj == NULL) { 3826 oop_index = oop_recorder()->allocate_metadata_index(obj); 3827 } else { 3828 oop_index = oop_recorder()->find_index(obj); 3829 } 3830 RelocationHolder rspec = metadata_Relocation::spec(oop_index); 3831 mov(dst, Address((address)obj, rspec)); 3832 } 3833 3834 Address MacroAssembler::constant_oop_address(jobject obj) { 3835 assert(oop_recorder() != NULL, "this assembler needs an OopRecorder"); 3836 assert(Universe::heap()->is_in_reserved(JNIHandles::resolve(obj)), "not an oop"); 3837 int oop_index = oop_recorder()->find_index(obj); 3838 return Address((address)obj, oop_Relocation::spec(oop_index)); 3839 } 3840 3841 // Defines obj, preserves var_size_in_bytes, okay for t2 == var_size_in_bytes. 3842 void MacroAssembler::tlab_allocate(Register obj, 3843 Register var_size_in_bytes, 3844 int con_size_in_bytes, 3845 Register t1, 3846 Register t2, 3847 Label& slow_case) { 3848 assert_different_registers(obj, t2); 3849 assert_different_registers(obj, var_size_in_bytes); 3850 Register end = t2; 3851 3852 // verify_tlab(); 3853 3854 ldr(obj, Address(rthread, JavaThread::tlab_top_offset())); 3855 if (var_size_in_bytes == noreg) { 3856 lea(end, Address(obj, con_size_in_bytes)); 3857 } else { 3858 lea(end, Address(obj, var_size_in_bytes)); 3859 } 3860 ldr(rscratch1, Address(rthread, JavaThread::tlab_end_offset())); 3861 cmp(end, rscratch1); 3862 br(Assembler::HI, slow_case); 3863 3864 // update the tlab top pointer 3865 str(end, Address(rthread, JavaThread::tlab_top_offset())); 3866 3867 // recover var_size_in_bytes if necessary 3868 if (var_size_in_bytes == end) { 3869 sub(var_size_in_bytes, var_size_in_bytes, obj); 3870 } 3871 // verify_tlab(); 3872 } 3873 3874 // Preserves r19, and r3. 3875 Register MacroAssembler::tlab_refill(Label& retry, 3876 Label& try_eden, 3877 Label& slow_case) { 3878 Register top = r0; 3879 Register t1 = r2; 3880 Register t2 = r4; 3881 assert_different_registers(top, rthread, t1, t2, /* preserve: */ r19, r3); 3882 Label do_refill, discard_tlab; 3883 3884 if (!Universe::heap()->supports_inline_contig_alloc()) { 3885 // No allocation in the shared eden. 3886 b(slow_case); 3887 } 3888 3889 ldr(top, Address(rthread, in_bytes(JavaThread::tlab_top_offset()))); 3890 ldr(t1, Address(rthread, in_bytes(JavaThread::tlab_end_offset()))); 3891 3892 // calculate amount of free space 3893 sub(t1, t1, top); 3894 lsr(t1, t1, LogHeapWordSize); 3895 3896 // Retain tlab and allocate object in shared space if 3897 // the amount free in the tlab is too large to discard. 3898 3899 ldr(rscratch1, Address(rthread, in_bytes(JavaThread::tlab_refill_waste_limit_offset()))); 3900 cmp(t1, rscratch1); 3901 br(Assembler::LE, discard_tlab); 3902 3903 // Retain 3904 // ldr(rscratch1, Address(rthread, in_bytes(JavaThread::tlab_refill_waste_limit_offset()))); 3905 mov(t2, (int32_t) ThreadLocalAllocBuffer::refill_waste_limit_increment()); 3906 add(rscratch1, rscratch1, t2); 3907 str(rscratch1, Address(rthread, in_bytes(JavaThread::tlab_refill_waste_limit_offset()))); 3908 3909 if (TLABStats) { 3910 // increment number of slow_allocations 3911 addmw(Address(rthread, in_bytes(JavaThread::tlab_slow_allocations_offset())), 3912 1, rscratch1); 3913 } 3914 b(try_eden); 3915 3916 bind(discard_tlab); 3917 if (TLABStats) { 3918 // increment number of refills 3919 addmw(Address(rthread, in_bytes(JavaThread::tlab_number_of_refills_offset())), 1, 3920 rscratch1); 3921 // accumulate wastage -- t1 is amount free in tlab 3922 addmw(Address(rthread, in_bytes(JavaThread::tlab_fast_refill_waste_offset())), t1, 3923 rscratch1); 3924 } 3925 3926 // if tlab is currently allocated (top or end != null) then 3927 // fill [top, end + alignment_reserve) with array object 3928 cbz(top, do_refill); 3929 3930 // set up the mark word 3931 mov(rscratch1, (intptr_t)markOopDesc::prototype()->copy_set_hash(0x2)); 3932 str(rscratch1, Address(top, oopDesc::mark_offset_in_bytes())); 3933 // set the length to the remaining space 3934 sub(t1, t1, typeArrayOopDesc::header_size(T_INT)); 3935 add(t1, t1, (int32_t)ThreadLocalAllocBuffer::alignment_reserve()); 3936 lsl(t1, t1, log2_intptr(HeapWordSize/sizeof(jint))); 3937 strw(t1, Address(top, arrayOopDesc::length_offset_in_bytes())); 3938 // set klass to intArrayKlass 3939 { 3940 unsigned long offset; 3941 // dubious reloc why not an oop reloc? 3942 adrp(rscratch1, ExternalAddress((address)Universe::intArrayKlassObj_addr()), 3943 offset); 3944 ldr(t1, Address(rscratch1, offset)); 3945 } 3946 // store klass last. concurrent gcs assumes klass length is valid if 3947 // klass field is not null. 3948 store_klass(top, t1); 3949 3950 mov(t1, top); 3951 ldr(rscratch1, Address(rthread, in_bytes(JavaThread::tlab_start_offset()))); 3952 sub(t1, t1, rscratch1); 3953 incr_allocated_bytes(rthread, t1, 0, rscratch1); 3954 3955 // refill the tlab with an eden allocation 3956 bind(do_refill); 3957 ldr(t1, Address(rthread, in_bytes(JavaThread::tlab_size_offset()))); 3958 lsl(t1, t1, LogHeapWordSize); 3959 // allocate new tlab, address returned in top 3960 eden_allocate(top, t1, 0, t2, slow_case); 3961 3962 // Check that t1 was preserved in eden_allocate. 3963 #ifdef ASSERT 3964 if (UseTLAB) { 3965 Label ok; 3966 Register tsize = r4; 3967 assert_different_registers(tsize, rthread, t1); 3968 str(tsize, Address(pre(sp, -16))); 3969 ldr(tsize, Address(rthread, in_bytes(JavaThread::tlab_size_offset()))); 3970 lsl(tsize, tsize, LogHeapWordSize); 3971 cmp(t1, tsize); 3972 br(Assembler::EQ, ok); 3973 STOP("assert(t1 != tlab size)"); 3974 should_not_reach_here(); 3975 3976 bind(ok); 3977 ldr(tsize, Address(post(sp, 16))); 3978 } 3979 #endif 3980 str(top, Address(rthread, in_bytes(JavaThread::tlab_start_offset()))); 3981 str(top, Address(rthread, in_bytes(JavaThread::tlab_top_offset()))); 3982 add(top, top, t1); 3983 sub(top, top, (int32_t)ThreadLocalAllocBuffer::alignment_reserve_in_bytes()); 3984 str(top, Address(rthread, in_bytes(JavaThread::tlab_end_offset()))); 3985 3986 if (ZeroTLAB) { 3987 // This is a fast TLAB refill, therefore the GC is not notified of it. 3988 // So compiled code must fill the new TLAB with zeroes. 3989 ldr(top, Address(rthread, in_bytes(JavaThread::tlab_start_offset()))); 3990 zero_memory(top,t1,t2); 3991 } 3992 3993 verify_tlab(); 3994 b(retry); 3995 3996 return rthread; // for use by caller 3997 } 3998 3999 // Zero words; len is in bytes 4000 // Destroys all registers except addr 4001 // len must be a nonzero multiple of wordSize 4002 void MacroAssembler::zero_memory(Register addr, Register len, Register t1) { 4003 assert_different_registers(addr, len, t1, rscratch1, rscratch2); 4004 4005 #ifdef ASSERT 4006 { Label L; 4007 tst(len, BytesPerWord - 1); 4008 br(Assembler::EQ, L); 4009 stop("len is not a multiple of BytesPerWord"); 4010 bind(L); 4011 } 4012 #endif 4013 4014 #ifndef PRODUCT 4015 block_comment("zero memory"); 4016 #endif 4017 4018 Label loop; 4019 Label entry; 4020 4021 // Algorithm: 4022 // 4023 // scratch1 = cnt & 7; 4024 // cnt -= scratch1; 4025 // p += scratch1; 4026 // switch (scratch1) { 4027 // do { 4028 // cnt -= 8; 4029 // p[-8] = 0; 4030 // case 7: 4031 // p[-7] = 0; 4032 // case 6: 4033 // p[-6] = 0; 4034 // // ... 4035 // case 1: 4036 // p[-1] = 0; 4037 // case 0: 4038 // p += 8; 4039 // } while (cnt); 4040 // } 4041 4042 const int unroll = 8; // Number of str(zr) instructions we'll unroll 4043 4044 lsr(len, len, LogBytesPerWord); 4045 andr(rscratch1, len, unroll - 1); // tmp1 = cnt % unroll 4046 sub(len, len, rscratch1); // cnt -= unroll 4047 // t1 always points to the end of the region we're about to zero 4048 add(t1, addr, rscratch1, Assembler::LSL, LogBytesPerWord); 4049 adr(rscratch2, entry); 4050 sub(rscratch2, rscratch2, rscratch1, Assembler::LSL, 2); 4051 br(rscratch2); 4052 bind(loop); 4053 sub(len, len, unroll); 4054 for (int i = -unroll; i < 0; i++) 4055 str(zr, Address(t1, i * wordSize)); 4056 bind(entry); 4057 add(t1, t1, unroll * wordSize); 4058 cbnz(len, loop); 4059 } 4060 4061 // Defines obj, preserves var_size_in_bytes 4062 void MacroAssembler::eden_allocate(Register obj, 4063 Register var_size_in_bytes, 4064 int con_size_in_bytes, 4065 Register t1, 4066 Label& slow_case) { 4067 assert_different_registers(obj, var_size_in_bytes, t1); 4068 if (!Universe::heap()->supports_inline_contig_alloc()) { 4069 b(slow_case); 4070 } else { 4071 Register end = t1; 4072 Register heap_end = rscratch2; 4073 Label retry; 4074 bind(retry); 4075 { 4076 unsigned long offset; 4077 adrp(rscratch1, ExternalAddress((address) Universe::heap()->end_addr()), offset); 4078 ldr(heap_end, Address(rscratch1, offset)); 4079 } 4080 4081 ExternalAddress heap_top((address) Universe::heap()->top_addr()); 4082 4083 // Get the current top of the heap 4084 { 4085 unsigned long offset; 4086 adrp(rscratch1, heap_top, offset); 4087 // Use add() here after ARDP, rather than lea(). 4088 // lea() does not generate anything if its offset is zero. 4089 // However, relocs expect to find either an ADD or a load/store 4090 // insn after an ADRP. add() always generates an ADD insn, even 4091 // for add(Rn, Rn, 0). 4092 add(rscratch1, rscratch1, offset); 4093 ldaxr(obj, rscratch1); 4094 } 4095 4096 // Adjust it my the size of our new object 4097 if (var_size_in_bytes == noreg) { 4098 lea(end, Address(obj, con_size_in_bytes)); 4099 } else { 4100 lea(end, Address(obj, var_size_in_bytes)); 4101 } 4102 4103 // if end < obj then we wrapped around high memory 4104 cmp(end, obj); 4105 br(Assembler::LO, slow_case); 4106 4107 cmp(end, heap_end); 4108 br(Assembler::HI, slow_case); 4109 4110 // If heap_top hasn't been changed by some other thread, update it. 4111 stlxr(rscratch2, end, rscratch1); 4112 cbnzw(rscratch2, retry); 4113 } 4114 } 4115 4116 void MacroAssembler::verify_tlab() { 4117 #ifdef ASSERT 4118 if (UseTLAB && VerifyOops) { 4119 Label next, ok; 4120 4121 stp(rscratch2, rscratch1, Address(pre(sp, -16))); 4122 4123 ldr(rscratch2, Address(rthread, in_bytes(JavaThread::tlab_top_offset()))); 4124 ldr(rscratch1, Address(rthread, in_bytes(JavaThread::tlab_start_offset()))); 4125 cmp(rscratch2, rscratch1); 4126 br(Assembler::HS, next); 4127 STOP("assert(top >= start)"); 4128 should_not_reach_here(); 4129 4130 bind(next); 4131 ldr(rscratch2, Address(rthread, in_bytes(JavaThread::tlab_end_offset()))); 4132 ldr(rscratch1, Address(rthread, in_bytes(JavaThread::tlab_top_offset()))); 4133 cmp(rscratch2, rscratch1); 4134 br(Assembler::HS, ok); 4135 STOP("assert(top <= end)"); 4136 should_not_reach_here(); 4137 4138 bind(ok); 4139 ldp(rscratch2, rscratch1, Address(post(sp, 16))); 4140 } 4141 #endif 4142 } 4143 4144 // Writes to stack successive pages until offset reached to check for 4145 // stack overflow + shadow pages. This clobbers tmp. 4146 void MacroAssembler::bang_stack_size(Register size, Register tmp) { 4147 assert_different_registers(tmp, size, rscratch1); 4148 mov(tmp, sp); 4149 // Bang stack for total size given plus shadow page size. 4150 // Bang one page at a time because large size can bang beyond yellow and 4151 // red zones. 4152 Label loop; 4153 mov(rscratch1, os::vm_page_size()); 4154 bind(loop); 4155 lea(tmp, Address(tmp, -os::vm_page_size())); 4156 subsw(size, size, rscratch1); 4157 str(size, Address(tmp)); 4158 br(Assembler::GT, loop); 4159 4160 // Bang down shadow pages too. 4161 // At this point, (tmp-0) is the last address touched, so don't 4162 // touch it again. (It was touched as (tmp-pagesize) but then tmp 4163 // was post-decremented.) Skip this address by starting at i=1, and 4164 // touch a few more pages below. N.B. It is important to touch all 4165 // the way down to and including i=StackShadowPages. 4166 for (int i = 0; i < (int)(JavaThread::stack_shadow_zone_size() / os::vm_page_size()) - 1; i++) { 4167 // this could be any sized move but this is can be a debugging crumb 4168 // so the bigger the better. 4169 lea(tmp, Address(tmp, -os::vm_page_size())); 4170 str(size, Address(tmp)); 4171 } 4172 } 4173 4174 4175 address MacroAssembler::read_polling_page(Register r, address page, relocInfo::relocType rtype) { 4176 unsigned long off; 4177 adrp(r, Address(page, rtype), off); 4178 InstructionMark im(this); 4179 code_section()->relocate(inst_mark(), rtype); 4180 ldrw(zr, Address(r, off)); 4181 return inst_mark(); 4182 } 4183 4184 address MacroAssembler::read_polling_page(Register r, relocInfo::relocType rtype) { 4185 InstructionMark im(this); 4186 code_section()->relocate(inst_mark(), rtype); 4187 ldrw(zr, Address(r, 0)); 4188 return inst_mark(); 4189 } 4190 4191 void MacroAssembler::adrp(Register reg1, const Address &dest, unsigned long &byte_offset) { 4192 relocInfo::relocType rtype = dest.rspec().reloc()->type(); 4193 unsigned long low_page = (unsigned long)CodeCache::low_bound() >> 12; 4194 unsigned long high_page = (unsigned long)(CodeCache::high_bound()-1) >> 12; 4195 unsigned long dest_page = (unsigned long)dest.target() >> 12; 4196 long offset_low = dest_page - low_page; 4197 long offset_high = dest_page - high_page; 4198 4199 assert(is_valid_AArch64_address(dest.target()), "bad address"); 4200 assert(dest.getMode() == Address::literal, "ADRP must be applied to a literal address"); 4201 4202 InstructionMark im(this); 4203 code_section()->relocate(inst_mark(), dest.rspec()); 4204 // 8143067: Ensure that the adrp can reach the dest from anywhere within 4205 // the code cache so that if it is relocated we know it will still reach 4206 if (offset_high >= -(1<<20) && offset_low < (1<<20)) { 4207 _adrp(reg1, dest.target()); 4208 } else { 4209 unsigned long target = (unsigned long)dest.target(); 4210 unsigned long adrp_target 4211 = (target & 0xffffffffUL) | ((unsigned long)pc() & 0xffff00000000UL); 4212 4213 _adrp(reg1, (address)adrp_target); 4214 movk(reg1, target >> 32, 32); 4215 } 4216 byte_offset = (unsigned long)dest.target() & 0xfff; 4217 } 4218 4219 void MacroAssembler::load_byte_map_base(Register reg) { 4220 jbyte *byte_map_base = 4221 ((CardTableModRefBS*)(Universe::heap()->barrier_set()))->byte_map_base; 4222 4223 if (is_valid_AArch64_address((address)byte_map_base)) { 4224 // Strictly speaking the byte_map_base isn't an address at all, 4225 // and it might even be negative. 4226 unsigned long offset; 4227 adrp(reg, ExternalAddress((address)byte_map_base), offset); 4228 // We expect offset to be zero with most collectors. 4229 if (offset != 0) { 4230 add(reg, reg, offset); 4231 } 4232 } else { 4233 mov(reg, (uint64_t)byte_map_base); 4234 } 4235 } 4236 4237 void MacroAssembler::build_frame(int framesize) { 4238 assert(framesize > 0, "framesize must be > 0"); 4239 if (framesize < ((1 << 9) + 2 * wordSize)) { 4240 sub(sp, sp, framesize); 4241 stp(rfp, lr, Address(sp, framesize - 2 * wordSize)); 4242 if (PreserveFramePointer) add(rfp, sp, framesize - 2 * wordSize); 4243 } else { 4244 stp(rfp, lr, Address(pre(sp, -2 * wordSize))); 4245 if (PreserveFramePointer) mov(rfp, sp); 4246 if (framesize < ((1 << 12) + 2 * wordSize)) 4247 sub(sp, sp, framesize - 2 * wordSize); 4248 else { 4249 mov(rscratch1, framesize - 2 * wordSize); 4250 sub(sp, sp, rscratch1); 4251 } 4252 } 4253 } 4254 4255 void MacroAssembler::remove_frame(int framesize) { 4256 assert(framesize > 0, "framesize must be > 0"); 4257 if (framesize < ((1 << 9) + 2 * wordSize)) { 4258 ldp(rfp, lr, Address(sp, framesize - 2 * wordSize)); 4259 add(sp, sp, framesize); 4260 } else { 4261 if (framesize < ((1 << 12) + 2 * wordSize)) 4262 add(sp, sp, framesize - 2 * wordSize); 4263 else { 4264 mov(rscratch1, framesize - 2 * wordSize); 4265 add(sp, sp, rscratch1); 4266 } 4267 ldp(rfp, lr, Address(post(sp, 2 * wordSize))); 4268 } 4269 } 4270 4271 typedef void (MacroAssembler::* chr_insn)(Register Rt, const Address &adr); 4272 4273 // Search for str1 in str2 and return index or -1 4274 void MacroAssembler::string_indexof(Register str2, Register str1, 4275 Register cnt2, Register cnt1, 4276 Register tmp1, Register tmp2, 4277 Register tmp3, Register tmp4, 4278 int icnt1, Register result, int ae) { 4279 Label BM, LINEARSEARCH, DONE, NOMATCH, MATCH; 4280 4281 Register ch1 = rscratch1; 4282 Register ch2 = rscratch2; 4283 Register cnt1tmp = tmp1; 4284 Register cnt2tmp = tmp2; 4285 Register cnt1_neg = cnt1; 4286 Register cnt2_neg = cnt2; 4287 Register result_tmp = tmp4; 4288 4289 bool isL = ae == StrIntrinsicNode::LL; 4290 4291 bool str1_isL = ae == StrIntrinsicNode::LL || ae == StrIntrinsicNode::UL; 4292 bool str2_isL = ae == StrIntrinsicNode::LL || ae == StrIntrinsicNode::LU; 4293 int str1_chr_shift = str1_isL ? 0:1; 4294 int str2_chr_shift = str2_isL ? 0:1; 4295 int str1_chr_size = str1_isL ? 1:2; 4296 int str2_chr_size = str2_isL ? 1:2; 4297 chr_insn str1_load_1chr = str1_isL ? (chr_insn)&MacroAssembler::ldrb : 4298 (chr_insn)&MacroAssembler::ldrh; 4299 chr_insn str2_load_1chr = str2_isL ? (chr_insn)&MacroAssembler::ldrb : 4300 (chr_insn)&MacroAssembler::ldrh; 4301 chr_insn load_2chr = isL ? (chr_insn)&MacroAssembler::ldrh : (chr_insn)&MacroAssembler::ldrw; 4302 chr_insn load_4chr = isL ? (chr_insn)&MacroAssembler::ldrw : (chr_insn)&MacroAssembler::ldr; 4303 4304 // Note, inline_string_indexOf() generates checks: 4305 // if (substr.count > string.count) return -1; 4306 // if (substr.count == 0) return 0; 4307 4308 // We have two strings, a source string in str2, cnt2 and a pattern string 4309 // in str1, cnt1. Find the 1st occurence of pattern in source or return -1. 4310 4311 // For larger pattern and source we use a simplified Boyer Moore algorithm. 4312 // With a small pattern and source we use linear scan. 4313 4314 if (icnt1 == -1) { 4315 cmp(cnt1, 256); // Use Linear Scan if cnt1 < 8 || cnt1 >= 256 4316 ccmp(cnt1, 8, 0b0000, LO); // Can't handle skip >= 256 because we use 4317 br(LO, LINEARSEARCH); // a byte array. 4318 cmp(cnt1, cnt2, LSR, 2); // Source must be 4 * pattern for BM 4319 br(HS, LINEARSEARCH); 4320 } 4321 4322 // The Boyer Moore alogorithm is based on the description here:- 4323 // 4324 // http://en.wikipedia.org/wiki/Boyer%E2%80%93Moore_string_search_algorithm 4325 // 4326 // This describes and algorithm with 2 shift rules. The 'Bad Character' rule 4327 // and the 'Good Suffix' rule. 4328 // 4329 // These rules are essentially heuristics for how far we can shift the 4330 // pattern along the search string. 4331 // 4332 // The implementation here uses the 'Bad Character' rule only because of the 4333 // complexity of initialisation for the 'Good Suffix' rule. 4334 // 4335 // This is also known as the Boyer-Moore-Horspool algorithm:- 4336 // 4337 // http://en.wikipedia.org/wiki/Boyer-Moore-Horspool_algorithm 4338 // 4339 // #define ASIZE 128 4340 // 4341 // int bm(unsigned char *x, int m, unsigned char *y, int n) { 4342 // int i, j; 4343 // unsigned c; 4344 // unsigned char bc[ASIZE]; 4345 // 4346 // /* Preprocessing */ 4347 // for (i = 0; i < ASIZE; ++i) 4348 // bc[i] = 0; 4349 // for (i = 0; i < m - 1; ) { 4350 // c = x[i]; 4351 // ++i; 4352 // if (c < ASIZE) bc[c] = i; 4353 // } 4354 // 4355 // /* Searching */ 4356 // j = 0; 4357 // while (j <= n - m) { 4358 // c = y[i+j]; 4359 // if (x[m-1] == c) 4360 // for (i = m - 2; i >= 0 && x[i] == y[i + j]; --i); 4361 // if (i < 0) return j; 4362 // if (c < ASIZE) 4363 // j = j - bc[y[j+m-1]] + m; 4364 // else 4365 // j += 1; // Advance by 1 only if char >= ASIZE 4366 // } 4367 // } 4368 4369 if (icnt1 == -1) { 4370 BIND(BM); 4371 4372 Label ZLOOP, BCLOOP, BCSKIP, BMLOOPSTR2, BMLOOPSTR1, BMSKIP; 4373 Label BMADV, BMMATCH, BMCHECKEND; 4374 4375 Register cnt1end = tmp2; 4376 Register str2end = cnt2; 4377 Register skipch = tmp2; 4378 4379 // Restrict ASIZE to 128 to reduce stack space/initialisation. 4380 // The presence of chars >= ASIZE in the target string does not affect 4381 // performance, but we must be careful not to initialise them in the stack 4382 // array. 4383 // The presence of chars >= ASIZE in the source string may adversely affect 4384 // performance since we can only advance by one when we encounter one. 4385 4386 stp(zr, zr, pre(sp, -128)); 4387 for (int i = 1; i < 8; i++) 4388 stp(zr, zr, Address(sp, i*16)); 4389 4390 mov(cnt1tmp, 0); 4391 sub(cnt1end, cnt1, 1); 4392 BIND(BCLOOP); 4393 (this->*str1_load_1chr)(ch1, Address(str1, cnt1tmp, Address::lsl(str1_chr_shift))); 4394 cmp(ch1, 128); 4395 add(cnt1tmp, cnt1tmp, 1); 4396 br(HS, BCSKIP); 4397 strb(cnt1tmp, Address(sp, ch1)); 4398 BIND(BCSKIP); 4399 cmp(cnt1tmp, cnt1end); 4400 br(LT, BCLOOP); 4401 4402 mov(result_tmp, str2); 4403 4404 sub(cnt2, cnt2, cnt1); 4405 add(str2end, str2, cnt2, LSL, str2_chr_shift); 4406 BIND(BMLOOPSTR2); 4407 sub(cnt1tmp, cnt1, 1); 4408 (this->*str1_load_1chr)(ch1, Address(str1, cnt1tmp, Address::lsl(str1_chr_shift))); 4409 (this->*str2_load_1chr)(skipch, Address(str2, cnt1tmp, Address::lsl(str2_chr_shift))); 4410 cmp(ch1, skipch); 4411 br(NE, BMSKIP); 4412 subs(cnt1tmp, cnt1tmp, 1); 4413 br(LT, BMMATCH); 4414 BIND(BMLOOPSTR1); 4415 (this->*str1_load_1chr)(ch1, Address(str1, cnt1tmp, Address::lsl(str1_chr_shift))); 4416 (this->*str2_load_1chr)(ch2, Address(str2, cnt1tmp, Address::lsl(str2_chr_shift))); 4417 cmp(ch1, ch2); 4418 br(NE, BMSKIP); 4419 subs(cnt1tmp, cnt1tmp, 1); 4420 br(GE, BMLOOPSTR1); 4421 BIND(BMMATCH); 4422 sub(result, str2, result_tmp); 4423 if (!str2_isL) lsr(result, result, 1); 4424 add(sp, sp, 128); 4425 b(DONE); 4426 BIND(BMADV); 4427 add(str2, str2, str2_chr_size); 4428 b(BMCHECKEND); 4429 BIND(BMSKIP); 4430 cmp(skipch, 128); 4431 br(HS, BMADV); 4432 ldrb(ch2, Address(sp, skipch)); 4433 add(str2, str2, cnt1, LSL, str2_chr_shift); 4434 sub(str2, str2, ch2, LSL, str2_chr_shift); 4435 BIND(BMCHECKEND); 4436 cmp(str2, str2end); 4437 br(LE, BMLOOPSTR2); 4438 add(sp, sp, 128); 4439 b(NOMATCH); 4440 } 4441 4442 BIND(LINEARSEARCH); 4443 { 4444 Label DO1, DO2, DO3; 4445 4446 Register str2tmp = tmp2; 4447 Register first = tmp3; 4448 4449 if (icnt1 == -1) 4450 { 4451 Label DOSHORT, FIRST_LOOP, STR2_NEXT, STR1_LOOP, STR1_NEXT; 4452 4453 cmp(cnt1, str1_isL == str2_isL ? 4 : 2); 4454 br(LT, DOSHORT); 4455 4456 sub(cnt2, cnt2, cnt1); 4457 mov(result_tmp, cnt2); 4458 4459 lea(str1, Address(str1, cnt1, Address::lsl(str1_chr_shift))); 4460 lea(str2, Address(str2, cnt2, Address::lsl(str2_chr_shift))); 4461 sub(cnt1_neg, zr, cnt1, LSL, str1_chr_shift); 4462 sub(cnt2_neg, zr, cnt2, LSL, str2_chr_shift); 4463 (this->*str1_load_1chr)(first, Address(str1, cnt1_neg)); 4464 4465 BIND(FIRST_LOOP); 4466 (this->*str2_load_1chr)(ch2, Address(str2, cnt2_neg)); 4467 cmp(first, ch2); 4468 br(EQ, STR1_LOOP); 4469 BIND(STR2_NEXT); 4470 adds(cnt2_neg, cnt2_neg, str2_chr_size); 4471 br(LE, FIRST_LOOP); 4472 b(NOMATCH); 4473 4474 BIND(STR1_LOOP); 4475 adds(cnt1tmp, cnt1_neg, str1_chr_size); 4476 add(cnt2tmp, cnt2_neg, str2_chr_size); 4477 br(GE, MATCH); 4478 4479 BIND(STR1_NEXT); 4480 (this->*str1_load_1chr)(ch1, Address(str1, cnt1tmp)); 4481 (this->*str2_load_1chr)(ch2, Address(str2, cnt2tmp)); 4482 cmp(ch1, ch2); 4483 br(NE, STR2_NEXT); 4484 adds(cnt1tmp, cnt1tmp, str1_chr_size); 4485 add(cnt2tmp, cnt2tmp, str2_chr_size); 4486 br(LT, STR1_NEXT); 4487 b(MATCH); 4488 4489 BIND(DOSHORT); 4490 if (str1_isL == str2_isL) { 4491 cmp(cnt1, 2); 4492 br(LT, DO1); 4493 br(GT, DO3); 4494 } 4495 } 4496 4497 if (icnt1 == 4) { 4498 Label CH1_LOOP; 4499 4500 (this->*load_4chr)(ch1, str1); 4501 sub(cnt2, cnt2, 4); 4502 mov(result_tmp, cnt2); 4503 lea(str2, Address(str2, cnt2, Address::lsl(str2_chr_shift))); 4504 sub(cnt2_neg, zr, cnt2, LSL, str2_chr_shift); 4505 4506 BIND(CH1_LOOP); 4507 (this->*load_4chr)(ch2, Address(str2, cnt2_neg)); 4508 cmp(ch1, ch2); 4509 br(EQ, MATCH); 4510 adds(cnt2_neg, cnt2_neg, str2_chr_size); 4511 br(LE, CH1_LOOP); 4512 b(NOMATCH); 4513 } 4514 4515 if ((icnt1 == -1 && str1_isL == str2_isL) || icnt1 == 2) { 4516 Label CH1_LOOP; 4517 4518 BIND(DO2); 4519 (this->*load_2chr)(ch1, str1); 4520 sub(cnt2, cnt2, 2); 4521 mov(result_tmp, cnt2); 4522 lea(str2, Address(str2, cnt2, Address::lsl(str2_chr_shift))); 4523 sub(cnt2_neg, zr, cnt2, LSL, str2_chr_shift); 4524 4525 BIND(CH1_LOOP); 4526 (this->*load_2chr)(ch2, Address(str2, cnt2_neg)); 4527 cmp(ch1, ch2); 4528 br(EQ, MATCH); 4529 adds(cnt2_neg, cnt2_neg, str2_chr_size); 4530 br(LE, CH1_LOOP); 4531 b(NOMATCH); 4532 } 4533 4534 if ((icnt1 == -1 && str1_isL == str2_isL) || icnt1 == 3) { 4535 Label FIRST_LOOP, STR2_NEXT, STR1_LOOP; 4536 4537 BIND(DO3); 4538 (this->*load_2chr)(first, str1); 4539 (this->*str1_load_1chr)(ch1, Address(str1, 2*str1_chr_size)); 4540 4541 sub(cnt2, cnt2, 3); 4542 mov(result_tmp, cnt2); 4543 lea(str2, Address(str2, cnt2, Address::lsl(str2_chr_shift))); 4544 sub(cnt2_neg, zr, cnt2, LSL, str2_chr_shift); 4545 4546 BIND(FIRST_LOOP); 4547 (this->*load_2chr)(ch2, Address(str2, cnt2_neg)); 4548 cmpw(first, ch2); 4549 br(EQ, STR1_LOOP); 4550 BIND(STR2_NEXT); 4551 adds(cnt2_neg, cnt2_neg, str2_chr_size); 4552 br(LE, FIRST_LOOP); 4553 b(NOMATCH); 4554 4555 BIND(STR1_LOOP); 4556 add(cnt2tmp, cnt2_neg, 2*str2_chr_size); 4557 (this->*str2_load_1chr)(ch2, Address(str2, cnt2tmp)); 4558 cmp(ch1, ch2); 4559 br(NE, STR2_NEXT); 4560 b(MATCH); 4561 } 4562 4563 if (icnt1 == -1 || icnt1 == 1) { 4564 Label CH1_LOOP, HAS_ZERO; 4565 Label DO1_SHORT, DO1_LOOP; 4566 4567 BIND(DO1); 4568 (this->*str1_load_1chr)(ch1, str1); 4569 cmp(cnt2, 8); 4570 br(LT, DO1_SHORT); 4571 4572 if (str2_isL) { 4573 if (!str1_isL) { 4574 tst(ch1, 0xff00); 4575 br(NE, NOMATCH); 4576 } 4577 orr(ch1, ch1, ch1, LSL, 8); 4578 } 4579 orr(ch1, ch1, ch1, LSL, 16); 4580 orr(ch1, ch1, ch1, LSL, 32); 4581 4582 sub(cnt2, cnt2, 8/str2_chr_size); 4583 mov(result_tmp, cnt2); 4584 lea(str2, Address(str2, cnt2, Address::lsl(str2_chr_shift))); 4585 sub(cnt2_neg, zr, cnt2, LSL, str2_chr_shift); 4586 4587 mov(tmp3, str2_isL ? 0x0101010101010101 : 0x0001000100010001); 4588 BIND(CH1_LOOP); 4589 ldr(ch2, Address(str2, cnt2_neg)); 4590 eor(ch2, ch1, ch2); 4591 sub(tmp1, ch2, tmp3); 4592 orr(tmp2, ch2, str2_isL ? 0x7f7f7f7f7f7f7f7f : 0x7fff7fff7fff7fff); 4593 bics(tmp1, tmp1, tmp2); 4594 br(NE, HAS_ZERO); 4595 adds(cnt2_neg, cnt2_neg, 8); 4596 br(LT, CH1_LOOP); 4597 4598 cmp(cnt2_neg, 8); 4599 mov(cnt2_neg, 0); 4600 br(LT, CH1_LOOP); 4601 b(NOMATCH); 4602 4603 BIND(HAS_ZERO); 4604 rev(tmp1, tmp1); 4605 clz(tmp1, tmp1); 4606 add(cnt2_neg, cnt2_neg, tmp1, LSR, 3); 4607 b(MATCH); 4608 4609 BIND(DO1_SHORT); 4610 mov(result_tmp, cnt2); 4611 lea(str2, Address(str2, cnt2, Address::lsl(str2_chr_shift))); 4612 sub(cnt2_neg, zr, cnt2, LSL, str2_chr_shift); 4613 BIND(DO1_LOOP); 4614 (this->*str2_load_1chr)(ch2, Address(str2, cnt2_neg)); 4615 cmpw(ch1, ch2); 4616 br(EQ, MATCH); 4617 adds(cnt2_neg, cnt2_neg, str2_chr_size); 4618 br(LT, DO1_LOOP); 4619 } 4620 } 4621 BIND(NOMATCH); 4622 mov(result, -1); 4623 b(DONE); 4624 BIND(MATCH); 4625 add(result, result_tmp, cnt2_neg, ASR, str2_chr_shift); 4626 BIND(DONE); 4627 } 4628 4629 typedef void (MacroAssembler::* chr_insn)(Register Rt, const Address &adr); 4630 typedef void (MacroAssembler::* uxt_insn)(Register Rd, Register Rn); 4631 4632 void MacroAssembler::string_indexof_char(Register str1, Register cnt1, 4633 Register ch, Register result, 4634 Register tmp1, Register tmp2, Register tmp3) 4635 { 4636 Label CH1_LOOP, HAS_ZERO, DO1_SHORT, DO1_LOOP, MATCH, NOMATCH, DONE; 4637 Register cnt1_neg = cnt1; 4638 Register ch1 = rscratch1; 4639 Register result_tmp = rscratch2; 4640 4641 cmp(cnt1, 4); 4642 br(LT, DO1_SHORT); 4643 4644 orr(ch, ch, ch, LSL, 16); 4645 orr(ch, ch, ch, LSL, 32); 4646 4647 sub(cnt1, cnt1, 4); 4648 mov(result_tmp, cnt1); 4649 lea(str1, Address(str1, cnt1, Address::uxtw(1))); 4650 sub(cnt1_neg, zr, cnt1, LSL, 1); 4651 4652 mov(tmp3, 0x0001000100010001); 4653 4654 BIND(CH1_LOOP); 4655 ldr(ch1, Address(str1, cnt1_neg)); 4656 eor(ch1, ch, ch1); 4657 sub(tmp1, ch1, tmp3); 4658 orr(tmp2, ch1, 0x7fff7fff7fff7fff); 4659 bics(tmp1, tmp1, tmp2); 4660 br(NE, HAS_ZERO); 4661 adds(cnt1_neg, cnt1_neg, 8); 4662 br(LT, CH1_LOOP); 4663 4664 cmp(cnt1_neg, 8); 4665 mov(cnt1_neg, 0); 4666 br(LT, CH1_LOOP); 4667 b(NOMATCH); 4668 4669 BIND(HAS_ZERO); 4670 rev(tmp1, tmp1); 4671 clz(tmp1, tmp1); 4672 add(cnt1_neg, cnt1_neg, tmp1, LSR, 3); 4673 b(MATCH); 4674 4675 BIND(DO1_SHORT); 4676 mov(result_tmp, cnt1); 4677 lea(str1, Address(str1, cnt1, Address::uxtw(1))); 4678 sub(cnt1_neg, zr, cnt1, LSL, 1); 4679 BIND(DO1_LOOP); 4680 ldrh(ch1, Address(str1, cnt1_neg)); 4681 cmpw(ch, ch1); 4682 br(EQ, MATCH); 4683 adds(cnt1_neg, cnt1_neg, 2); 4684 br(LT, DO1_LOOP); 4685 BIND(NOMATCH); 4686 mov(result, -1); 4687 b(DONE); 4688 BIND(MATCH); 4689 add(result, result_tmp, cnt1_neg, ASR, 1); 4690 BIND(DONE); 4691 } 4692 4693 // Compare strings. 4694 void MacroAssembler::string_compare(Register str1, Register str2, 4695 Register cnt1, Register cnt2, Register result, 4696 Register tmp1, 4697 FloatRegister vtmp, FloatRegister vtmpZ, int ae) { 4698 Label LENGTH_DIFF, DONE, SHORT_LOOP, SHORT_STRING, 4699 NEXT_WORD, DIFFERENCE; 4700 4701 bool isLL = ae == StrIntrinsicNode::LL; 4702 bool isLU = ae == StrIntrinsicNode::LU; 4703 bool isUL = ae == StrIntrinsicNode::UL; 4704 4705 bool str1_isL = isLL || isLU; 4706 bool str2_isL = isLL || isUL; 4707 4708 int str1_chr_shift = str1_isL ? 0 : 1; 4709 int str2_chr_shift = str2_isL ? 0 : 1; 4710 int str1_chr_size = str1_isL ? 1 : 2; 4711 int str2_chr_size = str2_isL ? 1 : 2; 4712 4713 chr_insn str1_load_chr = str1_isL ? (chr_insn)&MacroAssembler::ldrb : 4714 (chr_insn)&MacroAssembler::ldrh; 4715 chr_insn str2_load_chr = str2_isL ? (chr_insn)&MacroAssembler::ldrb : 4716 (chr_insn)&MacroAssembler::ldrh; 4717 uxt_insn ext_chr = isLL ? (uxt_insn)&MacroAssembler::uxtbw : 4718 (uxt_insn)&MacroAssembler::uxthw; 4719 4720 BLOCK_COMMENT("string_compare {"); 4721 4722 // Bizzarely, the counts are passed in bytes, regardless of whether they 4723 // are L or U strings, however the result is always in characters. 4724 if (!str1_isL) asrw(cnt1, cnt1, 1); 4725 if (!str2_isL) asrw(cnt2, cnt2, 1); 4726 4727 // Compute the minimum of the string lengths and save the difference. 4728 subsw(tmp1, cnt1, cnt2); 4729 cselw(cnt2, cnt1, cnt2, Assembler::LE); // min 4730 4731 // A very short string 4732 cmpw(cnt2, isLL ? 8:4); 4733 br(Assembler::LT, SHORT_STRING); 4734 4735 // Check if the strings start at the same location. 4736 cmp(str1, str2); 4737 br(Assembler::EQ, LENGTH_DIFF); 4738 4739 // Compare longwords 4740 { 4741 subw(cnt2, cnt2, isLL ? 8:4); // The last longword is a special case 4742 4743 // Move both string pointers to the last longword of their 4744 // strings, negate the remaining count, and convert it to bytes. 4745 lea(str1, Address(str1, cnt2, Address::uxtw(str1_chr_shift))); 4746 lea(str2, Address(str2, cnt2, Address::uxtw(str2_chr_shift))); 4747 if (isLU || isUL) { 4748 sub(cnt1, zr, cnt2, LSL, str1_chr_shift); 4749 eor(vtmpZ, T16B, vtmpZ, vtmpZ); 4750 } 4751 sub(cnt2, zr, cnt2, LSL, str2_chr_shift); 4752 4753 // Loop, loading longwords and comparing them into rscratch2. 4754 bind(NEXT_WORD); 4755 if (isLU) { 4756 ldrs(vtmp, Address(str1, cnt1)); 4757 zip1(vtmp, T8B, vtmp, vtmpZ); 4758 umov(result, vtmp, D, 0); 4759 } else { 4760 ldr(result, Address(str1, isUL ? cnt1:cnt2)); 4761 } 4762 if (isUL) { 4763 ldrs(vtmp, Address(str2, cnt2)); 4764 zip1(vtmp, T8B, vtmp, vtmpZ); 4765 umov(rscratch1, vtmp, D, 0); 4766 } else { 4767 ldr(rscratch1, Address(str2, cnt2)); 4768 } 4769 adds(cnt2, cnt2, isUL ? 4:8); 4770 if (isLU || isUL) add(cnt1, cnt1, isLU ? 4:8); 4771 eor(rscratch2, result, rscratch1); 4772 cbnz(rscratch2, DIFFERENCE); 4773 br(Assembler::LT, NEXT_WORD); 4774 4775 // Last longword. In the case where length == 4 we compare the 4776 // same longword twice, but that's still faster than another 4777 // conditional branch. 4778 4779 if (isLU) { 4780 ldrs(vtmp, Address(str1)); 4781 zip1(vtmp, T8B, vtmp, vtmpZ); 4782 umov(result, vtmp, D, 0); 4783 } else { 4784 ldr(result, Address(str1)); 4785 } 4786 if (isUL) { 4787 ldrs(vtmp, Address(str2)); 4788 zip1(vtmp, T8B, vtmp, vtmpZ); 4789 umov(rscratch1, vtmp, D, 0); 4790 } else { 4791 ldr(rscratch1, Address(str2)); 4792 } 4793 eor(rscratch2, result, rscratch1); 4794 cbz(rscratch2, LENGTH_DIFF); 4795 4796 // Find the first different characters in the longwords and 4797 // compute their difference. 4798 bind(DIFFERENCE); 4799 rev(rscratch2, rscratch2); 4800 clz(rscratch2, rscratch2); 4801 andr(rscratch2, rscratch2, isLL ? -8 : -16); 4802 lsrv(result, result, rscratch2); 4803 (this->*ext_chr)(result, result); 4804 lsrv(rscratch1, rscratch1, rscratch2); 4805 (this->*ext_chr)(rscratch1, rscratch1); 4806 subw(result, result, rscratch1); 4807 b(DONE); 4808 } 4809 4810 bind(SHORT_STRING); 4811 // Is the minimum length zero? 4812 cbz(cnt2, LENGTH_DIFF); 4813 4814 bind(SHORT_LOOP); 4815 (this->*str1_load_chr)(result, Address(post(str1, str1_chr_size))); 4816 (this->*str2_load_chr)(cnt1, Address(post(str2, str2_chr_size))); 4817 subw(result, result, cnt1); 4818 cbnz(result, DONE); 4819 sub(cnt2, cnt2, 1); 4820 cbnz(cnt2, SHORT_LOOP); 4821 4822 // Strings are equal up to min length. Return the length difference. 4823 bind(LENGTH_DIFF); 4824 mov(result, tmp1); 4825 4826 // That's it 4827 bind(DONE); 4828 4829 BLOCK_COMMENT("} string_compare"); 4830 } 4831 4832 // This method checks if provided byte array contains byte with highest bit set. 4833 void MacroAssembler::has_negatives(Register ary1, Register len, Register result) { 4834 // Simple and most common case of aligned small array which is not at the 4835 // end of memory page is placed here. All other cases are in stub. 4836 Label LOOP, END, STUB, STUB_LONG, SET_RESULT, DONE; 4837 const uint64_t UPPER_BIT_MASK=0x8080808080808080; 4838 assert_different_registers(ary1, len, result); 4839 4840 cmpw(len, 0); 4841 br(LE, SET_RESULT); 4842 cmpw(len, 4 * wordSize); 4843 br(GE, STUB_LONG); // size > 32 then go to stub 4844 4845 int shift = 64 - exact_log2(os::vm_page_size()); 4846 lsl(rscratch1, ary1, shift); 4847 mov(rscratch2, (size_t)(4 * wordSize) << shift); 4848 adds(rscratch2, rscratch1, rscratch2); // At end of page? 4849 br(CS, STUB); // at the end of page then go to stub 4850 subs(len, len, wordSize); 4851 br(LT, END); 4852 4853 BIND(LOOP); 4854 ldr(rscratch1, Address(post(ary1, wordSize))); 4855 tst(rscratch1, UPPER_BIT_MASK); 4856 br(NE, SET_RESULT); 4857 subs(len, len, wordSize); 4858 br(GE, LOOP); 4859 cmpw(len, -wordSize); 4860 br(EQ, SET_RESULT); 4861 4862 BIND(END); 4863 ldr(result, Address(ary1)); 4864 sub(len, zr, len, LSL, 3); // LSL 3 is to get bits from bytes 4865 lslv(result, result, len); 4866 tst(result, UPPER_BIT_MASK); 4867 b(SET_RESULT); 4868 4869 BIND(STUB); 4870 RuntimeAddress has_neg = RuntimeAddress(StubRoutines::aarch64::has_negatives()); 4871 assert(has_neg.target() != NULL, "has_negatives stub has not been generated"); 4872 trampoline_call(has_neg); 4873 b(DONE); 4874 4875 BIND(STUB_LONG); 4876 RuntimeAddress has_neg_long = RuntimeAddress( 4877 StubRoutines::aarch64::has_negatives_long()); 4878 assert(has_neg_long.target() != NULL, "has_negatives stub has not been generated"); 4879 trampoline_call(has_neg_long); 4880 b(DONE); 4881 4882 BIND(SET_RESULT); 4883 cset(result, NE); // set true or false 4884 4885 BIND(DONE); 4886 } 4887 4888 // Compare Strings or char/byte arrays. 4889 4890 // is_string is true iff this is a string comparison. 4891 4892 // For Strings we're passed the address of the first characters in a1 4893 // and a2 and the length in cnt1. 4894 4895 // For byte and char arrays we're passed the arrays themselves and we 4896 // have to extract length fields and do null checks here. 4897 4898 // elem_size is the element size in bytes: either 1 or 2. 4899 4900 // There are two implementations. For arrays >= 8 bytes, all 4901 // comparisons (including the final one, which may overlap) are 4902 // performed 8 bytes at a time. For arrays < 8 bytes, we compare a 4903 // halfword, then a short, and then a byte. 4904 4905 void MacroAssembler::arrays_equals(Register a1, Register a2, 4906 Register result, Register cnt1, 4907 int elem_size, bool is_string) 4908 { 4909 Label SAME, DONE, SHORT, NEXT_WORD, ONE; 4910 Register tmp1 = rscratch1; 4911 Register tmp2 = rscratch2; 4912 Register cnt2 = tmp2; // cnt2 only used in array length compare 4913 int elem_per_word = wordSize/elem_size; 4914 int log_elem_size = exact_log2(elem_size); 4915 int length_offset = arrayOopDesc::length_offset_in_bytes(); 4916 int base_offset 4917 = arrayOopDesc::base_offset_in_bytes(elem_size == 2 ? T_CHAR : T_BYTE); 4918 4919 assert(elem_size == 1 || elem_size == 2, "must be char or byte"); 4920 assert_different_registers(a1, a2, result, cnt1, rscratch1, rscratch2); 4921 4922 #ifndef PRODUCT 4923 { 4924 const char kind = (elem_size == 2) ? 'U' : 'L'; 4925 char comment[64]; 4926 snprintf(comment, sizeof comment, "%s%c%s {", 4927 is_string ? "string_equals" : "array_equals", 4928 kind, "{"); 4929 BLOCK_COMMENT(comment); 4930 } 4931 #endif 4932 4933 mov(result, false); 4934 4935 if (!is_string) { 4936 // if (a==a2) 4937 // return true; 4938 eor(rscratch1, a1, a2); 4939 cbz(rscratch1, SAME); 4940 // if (a==null || a2==null) 4941 // return false; 4942 cbz(a1, DONE); 4943 cbz(a2, DONE); 4944 // if (a1.length != a2.length) 4945 // return false; 4946 ldrw(cnt1, Address(a1, length_offset)); 4947 ldrw(cnt2, Address(a2, length_offset)); 4948 eorw(tmp1, cnt1, cnt2); 4949 cbnzw(tmp1, DONE); 4950 4951 lea(a1, Address(a1, base_offset)); 4952 lea(a2, Address(a2, base_offset)); 4953 } 4954 4955 // Check for short strings, i.e. smaller than wordSize. 4956 subs(cnt1, cnt1, elem_per_word); 4957 br(Assembler::LT, SHORT); 4958 // Main 8 byte comparison loop. 4959 bind(NEXT_WORD); { 4960 ldr(tmp1, Address(post(a1, wordSize))); 4961 ldr(tmp2, Address(post(a2, wordSize))); 4962 subs(cnt1, cnt1, elem_per_word); 4963 eor(tmp1, tmp1, tmp2); 4964 cbnz(tmp1, DONE); 4965 } br(GT, NEXT_WORD); 4966 // Last longword. In the case where length == 4 we compare the 4967 // same longword twice, but that's still faster than another 4968 // conditional branch. 4969 // cnt1 could be 0, -1, -2, -3, -4 for chars; -4 only happens when 4970 // length == 4. 4971 if (log_elem_size > 0) 4972 lsl(cnt1, cnt1, log_elem_size); 4973 ldr(tmp1, Address(a1, cnt1)); 4974 ldr(tmp2, Address(a2, cnt1)); 4975 eor(tmp1, tmp1, tmp2); 4976 cbnz(tmp1, DONE); 4977 b(SAME); 4978 4979 bind(SHORT); 4980 Label TAIL03, TAIL01; 4981 4982 tbz(cnt1, 2 - log_elem_size, TAIL03); // 0-7 bytes left. 4983 { 4984 ldrw(tmp1, Address(post(a1, 4))); 4985 ldrw(tmp2, Address(post(a2, 4))); 4986 eorw(tmp1, tmp1, tmp2); 4987 cbnzw(tmp1, DONE); 4988 } 4989 bind(TAIL03); 4990 tbz(cnt1, 1 - log_elem_size, TAIL01); // 0-3 bytes left. 4991 { 4992 ldrh(tmp1, Address(post(a1, 2))); 4993 ldrh(tmp2, Address(post(a2, 2))); 4994 eorw(tmp1, tmp1, tmp2); 4995 cbnzw(tmp1, DONE); 4996 } 4997 bind(TAIL01); 4998 if (elem_size == 1) { // Only needed when comparing byte arrays. 4999 tbz(cnt1, 0, SAME); // 0-1 bytes left. 5000 { 5001 ldrb(tmp1, a1); 5002 ldrb(tmp2, a2); 5003 eorw(tmp1, tmp1, tmp2); 5004 cbnzw(tmp1, DONE); 5005 } 5006 } 5007 // Arrays are equal. 5008 bind(SAME); 5009 mov(result, true); 5010 5011 // That's it. 5012 bind(DONE); 5013 BLOCK_COMMENT(is_string ? "} string_equals" : "} array_equals"); 5014 } 5015 5016 5017 // The size of the blocks erased by the zero_blocks stub. We must 5018 // handle anything smaller than this ourselves in zero_words(). 5019 const int MacroAssembler::zero_words_block_size = 8; 5020 5021 // zero_words() is used by C2 ClearArray patterns. It is as small as 5022 // possible, handling small word counts locally and delegating 5023 // anything larger to the zero_blocks stub. It is expanded many times 5024 // in compiled code, so it is important to keep it short. 5025 5026 // ptr: Address of a buffer to be zeroed. 5027 // cnt: Count in HeapWords. 5028 // 5029 // ptr, cnt, rscratch1, and rscratch2 are clobbered. 5030 void MacroAssembler::zero_words(Register ptr, Register cnt) 5031 { 5032 assert(is_power_of_2(zero_words_block_size), "adjust this"); 5033 assert(ptr == r10 && cnt == r11, "mismatch in register usage"); 5034 5035 BLOCK_COMMENT("zero_words {"); 5036 cmp(cnt, zero_words_block_size); 5037 Label around, done, done16; 5038 br(LO, around); 5039 { 5040 RuntimeAddress zero_blocks = RuntimeAddress(StubRoutines::aarch64::zero_blocks()); 5041 assert(zero_blocks.target() != NULL, "zero_blocks stub has not been generated"); 5042 if (StubRoutines::aarch64::complete()) { 5043 trampoline_call(zero_blocks); 5044 } else { 5045 bl(zero_blocks); 5046 } 5047 } 5048 bind(around); 5049 for (int i = zero_words_block_size >> 1; i > 1; i >>= 1) { 5050 Label l; 5051 tbz(cnt, exact_log2(i), l); 5052 for (int j = 0; j < i; j += 2) { 5053 stp(zr, zr, post(ptr, 16)); 5054 } 5055 bind(l); 5056 } 5057 { 5058 Label l; 5059 tbz(cnt, 0, l); 5060 str(zr, Address(ptr)); 5061 bind(l); 5062 } 5063 BLOCK_COMMENT("} zero_words"); 5064 } 5065 5066 // base: Address of a buffer to be zeroed, 8 bytes aligned. 5067 // cnt: Immediate count in HeapWords. 5068 #define SmallArraySize (18 * BytesPerLong) 5069 void MacroAssembler::zero_words(Register base, u_int64_t cnt) 5070 { 5071 BLOCK_COMMENT("zero_words {"); 5072 int i = cnt & 1; // store any odd word to start 5073 if (i) str(zr, Address(base)); 5074 5075 if (cnt <= SmallArraySize / BytesPerLong) { 5076 for (; i < (int)cnt; i += 2) 5077 stp(zr, zr, Address(base, i * wordSize)); 5078 } else { 5079 const int unroll = 4; // Number of stp(zr, zr) instructions we'll unroll 5080 int remainder = cnt % (2 * unroll); 5081 for (; i < remainder; i += 2) 5082 stp(zr, zr, Address(base, i * wordSize)); 5083 5084 Label loop; 5085 Register cnt_reg = rscratch1; 5086 Register loop_base = rscratch2; 5087 cnt = cnt - remainder; 5088 mov(cnt_reg, cnt); 5089 // adjust base and prebias by -2 * wordSize so we can pre-increment 5090 add(loop_base, base, (remainder - 2) * wordSize); 5091 bind(loop); 5092 sub(cnt_reg, cnt_reg, 2 * unroll); 5093 for (i = 1; i < unroll; i++) 5094 stp(zr, zr, Address(loop_base, 2 * i * wordSize)); 5095 stp(zr, zr, Address(pre(loop_base, 2 * unroll * wordSize))); 5096 cbnz(cnt_reg, loop); 5097 } 5098 BLOCK_COMMENT("} zero_words"); 5099 } 5100 5101 // Zero blocks of memory by using DC ZVA. 5102 // 5103 // Aligns the base address first sufficently for DC ZVA, then uses 5104 // DC ZVA repeatedly for every full block. cnt is the size to be 5105 // zeroed in HeapWords. Returns the count of words left to be zeroed 5106 // in cnt. 5107 // 5108 // NOTE: This is intended to be used in the zero_blocks() stub. If 5109 // you want to use it elsewhere, note that cnt must be >= 2*zva_length. 5110 void MacroAssembler::zero_dcache_blocks(Register base, Register cnt) { 5111 Register tmp = rscratch1; 5112 Register tmp2 = rscratch2; 5113 int zva_length = VM_Version::zva_length(); 5114 Label initial_table_end, loop_zva; 5115 Label fini; 5116 5117 // Base must be 16 byte aligned. If not just return and let caller handle it 5118 tst(base, 0x0f); 5119 br(Assembler::NE, fini); 5120 // Align base with ZVA length. 5121 neg(tmp, base); 5122 andr(tmp, tmp, zva_length - 1); 5123 5124 // tmp: the number of bytes to be filled to align the base with ZVA length. 5125 add(base, base, tmp); 5126 sub(cnt, cnt, tmp, Assembler::ASR, 3); 5127 adr(tmp2, initial_table_end); 5128 sub(tmp2, tmp2, tmp, Assembler::LSR, 2); 5129 br(tmp2); 5130 5131 for (int i = -zva_length + 16; i < 0; i += 16) 5132 stp(zr, zr, Address(base, i)); 5133 bind(initial_table_end); 5134 5135 sub(cnt, cnt, zva_length >> 3); 5136 bind(loop_zva); 5137 dc(Assembler::ZVA, base); 5138 subs(cnt, cnt, zva_length >> 3); 5139 add(base, base, zva_length); 5140 br(Assembler::GE, loop_zva); 5141 add(cnt, cnt, zva_length >> 3); // count not zeroed by DC ZVA 5142 bind(fini); 5143 } 5144 5145 // base: Address of a buffer to be filled, 8 bytes aligned. 5146 // cnt: Count in 8-byte unit. 5147 // value: Value to be filled with. 5148 // base will point to the end of the buffer after filling. 5149 void MacroAssembler::fill_words(Register base, Register cnt, Register value) 5150 { 5151 // Algorithm: 5152 // 5153 // scratch1 = cnt & 7; 5154 // cnt -= scratch1; 5155 // p += scratch1; 5156 // switch (scratch1) { 5157 // do { 5158 // cnt -= 8; 5159 // p[-8] = v; 5160 // case 7: 5161 // p[-7] = v; 5162 // case 6: 5163 // p[-6] = v; 5164 // // ... 5165 // case 1: 5166 // p[-1] = v; 5167 // case 0: 5168 // p += 8; 5169 // } while (cnt); 5170 // } 5171 5172 assert_different_registers(base, cnt, value, rscratch1, rscratch2); 5173 5174 Label fini, skip, entry, loop; 5175 const int unroll = 8; // Number of stp instructions we'll unroll 5176 5177 cbz(cnt, fini); 5178 tbz(base, 3, skip); 5179 str(value, Address(post(base, 8))); 5180 sub(cnt, cnt, 1); 5181 bind(skip); 5182 5183 andr(rscratch1, cnt, (unroll-1) * 2); 5184 sub(cnt, cnt, rscratch1); 5185 add(base, base, rscratch1, Assembler::LSL, 3); 5186 adr(rscratch2, entry); 5187 sub(rscratch2, rscratch2, rscratch1, Assembler::LSL, 1); 5188 br(rscratch2); 5189 5190 bind(loop); 5191 add(base, base, unroll * 16); 5192 for (int i = -unroll; i < 0; i++) 5193 stp(value, value, Address(base, i * 16)); 5194 bind(entry); 5195 subs(cnt, cnt, unroll * 2); 5196 br(Assembler::GE, loop); 5197 5198 tbz(cnt, 0, fini); 5199 str(value, Address(post(base, 8))); 5200 bind(fini); 5201 } 5202 5203 // Intrinsic for sun/nio/cs/ISO_8859_1$Encoder.implEncodeISOArray and 5204 // java/lang/StringUTF16.compress. 5205 void MacroAssembler::encode_iso_array(Register src, Register dst, 5206 Register len, Register result, 5207 FloatRegister Vtmp1, FloatRegister Vtmp2, 5208 FloatRegister Vtmp3, FloatRegister Vtmp4) 5209 { 5210 Label DONE, NEXT_32, LOOP_8, NEXT_8, LOOP_1, NEXT_1; 5211 Register tmp1 = rscratch1; 5212 5213 mov(result, len); // Save initial len 5214 5215 #ifndef BUILTIN_SIM 5216 subs(len, len, 32); 5217 br(LT, LOOP_8); 5218 5219 // The following code uses the SIMD 'uqxtn' and 'uqxtn2' instructions 5220 // to convert chars to bytes. These set the 'QC' bit in the FPSR if 5221 // any char could not fit in a byte, so clear the FPSR so we can test it. 5222 clear_fpsr(); 5223 5224 BIND(NEXT_32); 5225 ld1(Vtmp1, Vtmp2, Vtmp3, Vtmp4, T8H, src); 5226 uqxtn(Vtmp1, T8B, Vtmp1, T8H); // uqxtn - write bottom half 5227 uqxtn(Vtmp1, T16B, Vtmp2, T8H); // uqxtn2 - write top half 5228 uqxtn(Vtmp2, T8B, Vtmp3, T8H); 5229 uqxtn(Vtmp2, T16B, Vtmp4, T8H); // uqxtn2 5230 get_fpsr(tmp1); 5231 cbnzw(tmp1, LOOP_8); 5232 st1(Vtmp1, Vtmp2, T16B, post(dst, 32)); 5233 subs(len, len, 32); 5234 add(src, src, 64); 5235 br(GE, NEXT_32); 5236 5237 BIND(LOOP_8); 5238 adds(len, len, 32-8); 5239 br(LT, LOOP_1); 5240 clear_fpsr(); // QC may be set from loop above, clear again 5241 BIND(NEXT_8); 5242 ld1(Vtmp1, T8H, src); 5243 uqxtn(Vtmp1, T8B, Vtmp1, T8H); 5244 get_fpsr(tmp1); 5245 cbnzw(tmp1, LOOP_1); 5246 st1(Vtmp1, T8B, post(dst, 8)); 5247 subs(len, len, 8); 5248 add(src, src, 16); 5249 br(GE, NEXT_8); 5250 5251 BIND(LOOP_1); 5252 adds(len, len, 8); 5253 br(LE, DONE); 5254 #else 5255 cbz(len, DONE); 5256 #endif 5257 BIND(NEXT_1); 5258 ldrh(tmp1, Address(post(src, 2))); 5259 tst(tmp1, 0xff00); 5260 br(NE, DONE); 5261 strb(tmp1, Address(post(dst, 1))); 5262 subs(len, len, 1); 5263 br(GT, NEXT_1); 5264 5265 BIND(DONE); 5266 sub(result, result, len); // Return index where we stopped 5267 // Return len == 0 if we processed all 5268 // characters 5269 } 5270 5271 5272 // Inflate byte[] array to char[]. 5273 void MacroAssembler::byte_array_inflate(Register src, Register dst, Register len, 5274 FloatRegister vtmp1, FloatRegister vtmp2, FloatRegister vtmp3, 5275 Register tmp4) { 5276 Label big, done; 5277 5278 assert_different_registers(src, dst, len, tmp4, rscratch1); 5279 5280 fmovd(vtmp1 , zr); 5281 lsrw(rscratch1, len, 3); 5282 5283 cbnzw(rscratch1, big); 5284 5285 // Short string: less than 8 bytes. 5286 { 5287 Label loop, around, tiny; 5288 5289 subsw(len, len, 4); 5290 andw(len, len, 3); 5291 br(LO, tiny); 5292 5293 // Use SIMD to do 4 bytes. 5294 ldrs(vtmp2, post(src, 4)); 5295 zip1(vtmp3, T8B, vtmp2, vtmp1); 5296 strd(vtmp3, post(dst, 8)); 5297 5298 cbzw(len, done); 5299 5300 // Do the remaining bytes by steam. 5301 bind(loop); 5302 ldrb(tmp4, post(src, 1)); 5303 strh(tmp4, post(dst, 2)); 5304 subw(len, len, 1); 5305 5306 bind(tiny); 5307 cbnz(len, loop); 5308 5309 bind(around); 5310 b(done); 5311 } 5312 5313 // Unpack the bytes 8 at a time. 5314 bind(big); 5315 andw(len, len, 7); 5316 5317 { 5318 Label loop, around; 5319 5320 bind(loop); 5321 ldrd(vtmp2, post(src, 8)); 5322 sub(rscratch1, rscratch1, 1); 5323 zip1(vtmp3, T16B, vtmp2, vtmp1); 5324 st1(vtmp3, T8H, post(dst, 16)); 5325 cbnz(rscratch1, loop); 5326 5327 bind(around); 5328 } 5329 5330 // Do the tail of up to 8 bytes. 5331 sub(src, src, 8); 5332 add(src, src, len, ext::uxtw, 0); 5333 ldrd(vtmp2, Address(src)); 5334 sub(dst, dst, 16); 5335 add(dst, dst, len, ext::uxtw, 1); 5336 zip1(vtmp3, T16B, vtmp2, vtmp1); 5337 st1(vtmp3, T8H, Address(dst)); 5338 5339 bind(done); 5340 } 5341 5342 // Compress char[] array to byte[]. 5343 void MacroAssembler::char_array_compress(Register src, Register dst, Register len, 5344 FloatRegister tmp1Reg, FloatRegister tmp2Reg, 5345 FloatRegister tmp3Reg, FloatRegister tmp4Reg, 5346 Register result) { 5347 encode_iso_array(src, dst, len, result, 5348 tmp1Reg, tmp2Reg, tmp3Reg, tmp4Reg); 5349 cmp(len, zr); 5350 csel(result, result, zr, EQ); 5351 } 5352 5353 // get_thread() can be called anywhere inside generated code so we 5354 // need to save whatever non-callee save context might get clobbered 5355 // by the call to JavaThread::aarch64_get_thread_helper() or, indeed, 5356 // the call setup code. 5357 // 5358 // aarch64_get_thread_helper() clobbers only r0, r1, and flags. 5359 // 5360 void MacroAssembler::get_thread(Register dst) { 5361 RegSet saved_regs = RegSet::range(r0, r1) + lr - dst; 5362 push(saved_regs, sp); 5363 5364 mov(lr, CAST_FROM_FN_PTR(address, JavaThread::aarch64_get_thread_helper)); 5365 blrt(lr, 1, 0, 1); 5366 if (dst != c_rarg0) { 5367 mov(dst, c_rarg0); 5368 } 5369 5370 pop(saved_regs, sp); 5371 }