1 /* 2 * Copyright (c) 1997, 2015, 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/node.hpp" 40 #include "runtime/biasedLocking.hpp" 41 #include "runtime/icache.hpp" 42 #include "runtime/interfaceSupport.hpp" 43 #include "runtime/sharedRuntime.hpp" 44 45 #if INCLUDE_ALL_GCS 46 #include "gc/g1/g1CollectedHeap.inline.hpp" 47 #include "gc/g1/g1SATBCardTableModRefBS.hpp" 48 #include "gc/g1/heapRegion.hpp" 49 #endif 50 51 #ifdef PRODUCT 52 #define BLOCK_COMMENT(str) /* nothing */ 53 #define STOP(error) stop(error) 54 #else 55 #define BLOCK_COMMENT(str) block_comment(str) 56 #define STOP(error) block_comment(error); stop(error) 57 #endif 58 59 #define BIND(label) bind(label); BLOCK_COMMENT(#label ":") 60 61 // Patch any kind of instruction; there may be several instructions. 62 // Return the total length (in bytes) of the instructions. 63 int MacroAssembler::pd_patch_instruction_size(address branch, address target) { 64 int instructions = 1; 65 assert((uint64_t)target < (1ul << 48), "48-bit overflow in address constant"); 66 long offset = (target - branch) >> 2; 67 unsigned insn = *(unsigned*)branch; 68 if ((Instruction_aarch64::extract(insn, 29, 24) & 0b111011) == 0b011000) { 69 // Load register (literal) 70 Instruction_aarch64::spatch(branch, 23, 5, offset); 71 } else if (Instruction_aarch64::extract(insn, 30, 26) == 0b00101) { 72 // Unconditional branch (immediate) 73 Instruction_aarch64::spatch(branch, 25, 0, offset); 74 } else if (Instruction_aarch64::extract(insn, 31, 25) == 0b0101010) { 75 // Conditional branch (immediate) 76 Instruction_aarch64::spatch(branch, 23, 5, offset); 77 } else if (Instruction_aarch64::extract(insn, 30, 25) == 0b011010) { 78 // Compare & branch (immediate) 79 Instruction_aarch64::spatch(branch, 23, 5, offset); 80 } else if (Instruction_aarch64::extract(insn, 30, 25) == 0b011011) { 81 // Test & branch (immediate) 82 Instruction_aarch64::spatch(branch, 18, 5, offset); 83 } else if (Instruction_aarch64::extract(insn, 28, 24) == 0b10000) { 84 // PC-rel. addressing 85 offset = target-branch; 86 int shift = Instruction_aarch64::extract(insn, 31, 31); 87 if (shift) { 88 u_int64_t dest = (u_int64_t)target; 89 uint64_t pc_page = (uint64_t)branch >> 12; 90 uint64_t adr_page = (uint64_t)target >> 12; 91 unsigned offset_lo = dest & 0xfff; 92 offset = adr_page - pc_page; 93 94 // We handle 3 types of PC relative addressing 95 // 1 - adrp Rx, target_page 96 // ldr/str Ry, [Rx, #offset_in_page] 97 // 2 - adrp Rx, target_page 98 // add Ry, Rx, #offset_in_page 99 // 3 - adrp Rx, target_page (page aligned reloc, offset == 0) 100 // In the first 2 cases we must check that Rx is the same in the adrp and the 101 // subsequent ldr/str or add instruction. Otherwise we could accidentally end 102 // up treating a type 3 relocation as a type 1 or 2 just because it happened 103 // to be followed by a random unrelated ldr/str or add instruction. 104 // 105 // In the case of a type 3 relocation, we know that these are only generated 106 // for the safepoint polling page, or for the card type byte map base so we 107 // assert as much and of course that the offset is 0. 108 // 109 unsigned insn2 = ((unsigned*)branch)[1]; 110 if (Instruction_aarch64::extract(insn2, 29, 24) == 0b111001 && 111 Instruction_aarch64::extract(insn, 4, 0) == 112 Instruction_aarch64::extract(insn2, 9, 5)) { 113 // Load/store register (unsigned immediate) 114 unsigned size = Instruction_aarch64::extract(insn2, 31, 30); 115 Instruction_aarch64::patch(branch + sizeof (unsigned), 116 21, 10, offset_lo >> size); 117 guarantee(((dest >> size) << size) == dest, "misaligned target"); 118 instructions = 2; 119 } else if (Instruction_aarch64::extract(insn2, 31, 22) == 0b1001000100 && 120 Instruction_aarch64::extract(insn, 4, 0) == 121 Instruction_aarch64::extract(insn2, 4, 0)) { 122 // add (immediate) 123 Instruction_aarch64::patch(branch + sizeof (unsigned), 124 21, 10, offset_lo); 125 instructions = 2; 126 } else { 127 assert((jbyte *)target == 128 ((CardTableModRefBS*)(Universe::heap()->barrier_set()))->byte_map_base || 129 target == StubRoutines::crc_table_addr() || 130 (address)target == os::get_polling_page(), 131 "adrp must be polling page or byte map base"); 132 assert(offset_lo == 0, "offset must be 0 for polling page or byte map base"); 133 } 134 } 135 int offset_lo = offset & 3; 136 offset >>= 2; 137 Instruction_aarch64::spatch(branch, 23, 5, offset); 138 Instruction_aarch64::patch(branch, 30, 29, offset_lo); 139 } else if (Instruction_aarch64::extract(insn, 31, 21) == 0b11010010100) { 140 u_int64_t dest = (u_int64_t)target; 141 // Move wide constant 142 assert(nativeInstruction_at(branch+4)->is_movk(), "wrong insns in patch"); 143 assert(nativeInstruction_at(branch+8)->is_movk(), "wrong insns in patch"); 144 Instruction_aarch64::patch(branch, 20, 5, dest & 0xffff); 145 Instruction_aarch64::patch(branch+4, 20, 5, (dest >>= 16) & 0xffff); 146 Instruction_aarch64::patch(branch+8, 20, 5, (dest >>= 16) & 0xffff); 147 assert(target_addr_for_insn(branch) == target, "should be"); 148 instructions = 3; 149 } else if (Instruction_aarch64::extract(insn, 31, 22) == 0b1011100101 && 150 Instruction_aarch64::extract(insn, 4, 0) == 0b11111) { 151 // nothing to do 152 assert(target == 0, "did not expect to relocate target for polling page load"); 153 } else { 154 ShouldNotReachHere(); 155 } 156 return instructions * NativeInstruction::instruction_size; 157 } 158 159 int MacroAssembler::patch_oop(address insn_addr, address o) { 160 int instructions; 161 unsigned insn = *(unsigned*)insn_addr; 162 assert(nativeInstruction_at(insn_addr+4)->is_movk(), "wrong insns in patch"); 163 164 // OOPs are either narrow (32 bits) or wide (48 bits). We encode 165 // narrow OOPs by setting the upper 16 bits in the first 166 // instruction. 167 if (Instruction_aarch64::extract(insn, 31, 21) == 0b11010010101) { 168 // Move narrow OOP 169 narrowOop n = oopDesc::encode_heap_oop((oop)o); 170 Instruction_aarch64::patch(insn_addr, 20, 5, n >> 16); 171 Instruction_aarch64::patch(insn_addr+4, 20, 5, n & 0xffff); 172 instructions = 2; 173 } else { 174 // Move wide OOP 175 assert(nativeInstruction_at(insn_addr+8)->is_movk(), "wrong insns in patch"); 176 uintptr_t dest = (uintptr_t)o; 177 Instruction_aarch64::patch(insn_addr, 20, 5, dest & 0xffff); 178 Instruction_aarch64::patch(insn_addr+4, 20, 5, (dest >>= 16) & 0xffff); 179 Instruction_aarch64::patch(insn_addr+8, 20, 5, (dest >>= 16) & 0xffff); 180 instructions = 3; 181 } 182 return instructions * NativeInstruction::instruction_size; 183 } 184 185 address MacroAssembler::target_addr_for_insn(address insn_addr, unsigned insn) { 186 long offset = 0; 187 if ((Instruction_aarch64::extract(insn, 29, 24) & 0b011011) == 0b00011000) { 188 // Load register (literal) 189 offset = Instruction_aarch64::sextract(insn, 23, 5); 190 return address(((uint64_t)insn_addr + (offset << 2))); 191 } else if (Instruction_aarch64::extract(insn, 30, 26) == 0b00101) { 192 // Unconditional branch (immediate) 193 offset = Instruction_aarch64::sextract(insn, 25, 0); 194 } else if (Instruction_aarch64::extract(insn, 31, 25) == 0b0101010) { 195 // Conditional branch (immediate) 196 offset = Instruction_aarch64::sextract(insn, 23, 5); 197 } else if (Instruction_aarch64::extract(insn, 30, 25) == 0b011010) { 198 // Compare & branch (immediate) 199 offset = Instruction_aarch64::sextract(insn, 23, 5); 200 } else if (Instruction_aarch64::extract(insn, 30, 25) == 0b011011) { 201 // Test & branch (immediate) 202 offset = Instruction_aarch64::sextract(insn, 18, 5); 203 } else if (Instruction_aarch64::extract(insn, 28, 24) == 0b10000) { 204 // PC-rel. addressing 205 offset = Instruction_aarch64::extract(insn, 30, 29); 206 offset |= Instruction_aarch64::sextract(insn, 23, 5) << 2; 207 int shift = Instruction_aarch64::extract(insn, 31, 31) ? 12 : 0; 208 if (shift) { 209 offset <<= shift; 210 uint64_t target_page = ((uint64_t)insn_addr) + offset; 211 target_page &= ((uint64_t)-1) << shift; 212 // Return the target address for the following sequences 213 // 1 - adrp Rx, target_page 214 // ldr/str Ry, [Rx, #offset_in_page] 215 // 2 - adrp Rx, target_page ] 216 // add Ry, Rx, #offset_in_page 217 // 3 - adrp Rx, target_page (page aligned reloc, offset == 0) 218 // 219 // In the first two cases we check that the register is the same and 220 // return the target_page + the offset within the page. 221 // Otherwise we assume it is a page aligned relocation and return 222 // the target page only. The only cases this is generated is for 223 // the safepoint polling page or for the card table byte map base so 224 // we assert as much. 225 // 226 unsigned insn2 = ((unsigned*)insn_addr)[1]; 227 if (Instruction_aarch64::extract(insn2, 29, 24) == 0b111001 && 228 Instruction_aarch64::extract(insn, 4, 0) == 229 Instruction_aarch64::extract(insn2, 9, 5)) { 230 // Load/store register (unsigned immediate) 231 unsigned int byte_offset = Instruction_aarch64::extract(insn2, 21, 10); 232 unsigned int size = Instruction_aarch64::extract(insn2, 31, 30); 233 return address(target_page + (byte_offset << size)); 234 } else if (Instruction_aarch64::extract(insn2, 31, 22) == 0b1001000100 && 235 Instruction_aarch64::extract(insn, 4, 0) == 236 Instruction_aarch64::extract(insn2, 4, 0)) { 237 // add (immediate) 238 unsigned int byte_offset = Instruction_aarch64::extract(insn2, 21, 10); 239 return address(target_page + byte_offset); 240 } else { 241 assert((jbyte *)target_page == 242 ((CardTableModRefBS*)(Universe::heap()->barrier_set()))->byte_map_base || 243 (address)target_page == os::get_polling_page(), 244 "adrp must be polling page or byte map base"); 245 return (address)target_page; 246 } 247 } else { 248 ShouldNotReachHere(); 249 } 250 } else if (Instruction_aarch64::extract(insn, 31, 23) == 0b110100101) { 251 u_int32_t *insns = (u_int32_t *)insn_addr; 252 // Move wide constant: movz, movk, movk. See movptr(). 253 assert(nativeInstruction_at(insns+1)->is_movk(), "wrong insns in patch"); 254 assert(nativeInstruction_at(insns+2)->is_movk(), "wrong insns in patch"); 255 return address(u_int64_t(Instruction_aarch64::extract(insns[0], 20, 5)) 256 + (u_int64_t(Instruction_aarch64::extract(insns[1], 20, 5)) << 16) 257 + (u_int64_t(Instruction_aarch64::extract(insns[2], 20, 5)) << 32)); 258 } else if (Instruction_aarch64::extract(insn, 31, 22) == 0b1011100101 && 259 Instruction_aarch64::extract(insn, 4, 0) == 0b11111) { 260 return 0; 261 } else { 262 ShouldNotReachHere(); 263 } 264 return address(((uint64_t)insn_addr + (offset << 2))); 265 } 266 267 void MacroAssembler::serialize_memory(Register thread, Register tmp) { 268 dsb(Assembler::SY); 269 } 270 271 272 void MacroAssembler::reset_last_Java_frame(bool clear_fp, 273 bool clear_pc) { 274 // we must set sp to zero to clear frame 275 str(zr, Address(rthread, JavaThread::last_Java_sp_offset())); 276 // must clear fp, so that compiled frames are not confused; it is 277 // possible that we need it only for debugging 278 if (clear_fp) { 279 str(zr, Address(rthread, JavaThread::last_Java_fp_offset())); 280 } 281 282 if (clear_pc) { 283 str(zr, Address(rthread, JavaThread::last_Java_pc_offset())); 284 } 285 } 286 287 // Calls to C land 288 // 289 // When entering C land, the rfp, & resp of the last Java frame have to be recorded 290 // in the (thread-local) JavaThread object. When leaving C land, the last Java fp 291 // has to be reset to 0. This is required to allow proper stack traversal. 292 void MacroAssembler::set_last_Java_frame(Register last_java_sp, 293 Register last_java_fp, 294 Register last_java_pc, 295 Register scratch) { 296 297 if (last_java_pc->is_valid()) { 298 str(last_java_pc, Address(rthread, 299 JavaThread::frame_anchor_offset() 300 + JavaFrameAnchor::last_Java_pc_offset())); 301 } 302 303 // determine last_java_sp register 304 if (last_java_sp == sp) { 305 mov(scratch, sp); 306 last_java_sp = scratch; 307 } else if (!last_java_sp->is_valid()) { 308 last_java_sp = esp; 309 } 310 311 str(last_java_sp, Address(rthread, JavaThread::last_Java_sp_offset())); 312 313 // last_java_fp is optional 314 if (last_java_fp->is_valid()) { 315 str(last_java_fp, Address(rthread, JavaThread::last_Java_fp_offset())); 316 } 317 } 318 319 void MacroAssembler::set_last_Java_frame(Register last_java_sp, 320 Register last_java_fp, 321 address last_java_pc, 322 Register scratch) { 323 if (last_java_pc != NULL) { 324 adr(scratch, last_java_pc); 325 } else { 326 // FIXME: This is almost never correct. We should delete all 327 // cases of set_last_Java_frame with last_java_pc=NULL and use the 328 // correct return address instead. 329 adr(scratch, pc()); 330 } 331 332 str(scratch, Address(rthread, 333 JavaThread::frame_anchor_offset() 334 + JavaFrameAnchor::last_Java_pc_offset())); 335 336 set_last_Java_frame(last_java_sp, last_java_fp, noreg, scratch); 337 } 338 339 void MacroAssembler::set_last_Java_frame(Register last_java_sp, 340 Register last_java_fp, 341 Label &L, 342 Register scratch) { 343 if (L.is_bound()) { 344 set_last_Java_frame(last_java_sp, last_java_fp, target(L), scratch); 345 } else { 346 InstructionMark im(this); 347 L.add_patch_at(code(), locator()); 348 set_last_Java_frame(last_java_sp, last_java_fp, (address)NULL, scratch); 349 } 350 } 351 352 void MacroAssembler::far_call(Address entry, CodeBuffer *cbuf, Register tmp) { 353 assert(ReservedCodeCacheSize < 4*G, "branch out of range"); 354 assert(CodeCache::find_blob(entry.target()) != NULL, 355 "destination of far call not found in code cache"); 356 if (far_branches()) { 357 unsigned long offset; 358 // We can use ADRP here because we know that the total size of 359 // the code cache cannot exceed 2Gb. 360 adrp(tmp, entry, offset); 361 add(tmp, tmp, offset); 362 if (cbuf) cbuf->set_insts_mark(); 363 blr(tmp); 364 } else { 365 if (cbuf) cbuf->set_insts_mark(); 366 bl(entry); 367 } 368 } 369 370 void MacroAssembler::far_jump(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 br(tmp); 382 } else { 383 if (cbuf) cbuf->set_insts_mark(); 384 b(entry); 385 } 386 } 387 388 int MacroAssembler::biased_locking_enter(Register lock_reg, 389 Register obj_reg, 390 Register swap_reg, 391 Register tmp_reg, 392 bool swap_reg_contains_mark, 393 Label& done, 394 Label* slow_case, 395 BiasedLockingCounters* counters) { 396 assert(UseBiasedLocking, "why call this otherwise?"); 397 assert_different_registers(lock_reg, obj_reg, swap_reg); 398 399 if (PrintBiasedLockingStatistics && counters == NULL) 400 counters = BiasedLocking::counters(); 401 402 assert_different_registers(lock_reg, obj_reg, swap_reg, tmp_reg, rscratch1, rscratch2, noreg); 403 assert(markOopDesc::age_shift == markOopDesc::lock_bits + markOopDesc::biased_lock_bits, "biased locking makes assumptions about bit layout"); 404 Address mark_addr (obj_reg, oopDesc::mark_offset_in_bytes()); 405 Address klass_addr (obj_reg, oopDesc::klass_offset_in_bytes()); 406 Address saved_mark_addr(lock_reg, 0); 407 408 // Biased locking 409 // See whether the lock is currently biased toward our thread and 410 // whether the epoch is still valid 411 // Note that the runtime guarantees sufficient alignment of JavaThread 412 // pointers to allow age to be placed into low bits 413 // First check to see whether biasing is even enabled for this object 414 Label cas_label; 415 int null_check_offset = -1; 416 if (!swap_reg_contains_mark) { 417 null_check_offset = offset(); 418 ldr(swap_reg, mark_addr); 419 } 420 andr(tmp_reg, swap_reg, markOopDesc::biased_lock_mask_in_place); 421 cmp(tmp_reg, markOopDesc::biased_lock_pattern); 422 br(Assembler::NE, cas_label); 423 // The bias pattern is present in the object's header. Need to check 424 // whether the bias owner and the epoch are both still current. 425 load_prototype_header(tmp_reg, obj_reg); 426 orr(tmp_reg, tmp_reg, rthread); 427 eor(tmp_reg, swap_reg, tmp_reg); 428 andr(tmp_reg, tmp_reg, ~((int) markOopDesc::age_mask_in_place)); 429 if (counters != NULL) { 430 Label around; 431 cbnz(tmp_reg, around); 432 atomic_incw(Address((address)counters->biased_lock_entry_count_addr()), tmp_reg, rscratch1, rscratch2); 433 b(done); 434 bind(around); 435 } else { 436 cbz(tmp_reg, done); 437 } 438 439 Label try_revoke_bias; 440 Label try_rebias; 441 442 // At this point we know that the header has the bias pattern and 443 // that we are not the bias owner in the current epoch. We need to 444 // figure out more details about the state of the header in order to 445 // know what operations can be legally performed on the object's 446 // header. 447 448 // If the low three bits in the xor result aren't clear, that means 449 // the prototype header is no longer biased and we have to revoke 450 // the bias on this object. 451 andr(rscratch1, tmp_reg, markOopDesc::biased_lock_mask_in_place); 452 cbnz(rscratch1, try_revoke_bias); 453 454 // Biasing is still enabled for this data type. See whether the 455 // epoch of the current bias is still valid, meaning that the epoch 456 // bits of the mark word are equal to the epoch bits of the 457 // prototype header. (Note that the prototype header's epoch bits 458 // only change at a safepoint.) If not, attempt to rebias the object 459 // toward the current thread. Note that we must be absolutely sure 460 // that the current epoch is invalid in order to do this because 461 // otherwise the manipulations it performs on the mark word are 462 // illegal. 463 andr(rscratch1, tmp_reg, markOopDesc::epoch_mask_in_place); 464 cbnz(rscratch1, try_rebias); 465 466 // The epoch of the current bias is still valid but we know nothing 467 // about the owner; it might be set or it might be clear. Try to 468 // acquire the bias of the object using an atomic operation. If this 469 // fails we will go in to the runtime to revoke the object's bias. 470 // Note that we first construct the presumed unbiased header so we 471 // don't accidentally blow away another thread's valid bias. 472 { 473 Label here; 474 mov(rscratch1, markOopDesc::biased_lock_mask_in_place | markOopDesc::age_mask_in_place | markOopDesc::epoch_mask_in_place); 475 andr(swap_reg, swap_reg, rscratch1); 476 orr(tmp_reg, swap_reg, rthread); 477 cmpxchgptr(swap_reg, tmp_reg, obj_reg, rscratch1, here, slow_case); 478 // If the biasing toward our thread failed, this means that 479 // another thread succeeded in biasing it toward itself and we 480 // need to revoke that bias. The revocation will occur in the 481 // interpreter runtime in the slow case. 482 bind(here); 483 if (counters != NULL) { 484 atomic_incw(Address((address)counters->anonymously_biased_lock_entry_count_addr()), 485 tmp_reg, rscratch1, rscratch2); 486 } 487 } 488 b(done); 489 490 bind(try_rebias); 491 // At this point we know the epoch has expired, meaning that the 492 // current "bias owner", if any, is actually invalid. Under these 493 // circumstances _only_, we are allowed to use the current header's 494 // value as the comparison value when doing the cas to acquire the 495 // bias in the current epoch. In other words, we allow transfer of 496 // the bias from one thread to another directly in this situation. 497 // 498 // FIXME: due to a lack of registers we currently blow away the age 499 // bits in this situation. Should attempt to preserve them. 500 { 501 Label here; 502 load_prototype_header(tmp_reg, obj_reg); 503 orr(tmp_reg, rthread, tmp_reg); 504 cmpxchgptr(swap_reg, tmp_reg, obj_reg, rscratch1, here, slow_case); 505 // If the biasing toward our thread failed, then another thread 506 // succeeded in biasing it toward itself and we need to revoke that 507 // bias. The revocation will occur in the runtime in the slow case. 508 bind(here); 509 if (counters != NULL) { 510 atomic_incw(Address((address)counters->rebiased_lock_entry_count_addr()), 511 tmp_reg, rscratch1, rscratch2); 512 } 513 } 514 b(done); 515 516 bind(try_revoke_bias); 517 // The prototype mark in the klass doesn't have the bias bit set any 518 // more, indicating that objects of this data type are not supposed 519 // to be biased any more. We are going to try to reset the mark of 520 // this object to the prototype value and fall through to the 521 // CAS-based locking scheme. Note that if our CAS fails, it means 522 // that another thread raced us for the privilege of revoking the 523 // bias of this particular object, so it's okay to continue in the 524 // normal locking code. 525 // 526 // FIXME: due to a lack of registers we currently blow away the age 527 // bits in this situation. Should attempt to preserve them. 528 { 529 Label here, nope; 530 load_prototype_header(tmp_reg, obj_reg); 531 cmpxchgptr(swap_reg, tmp_reg, obj_reg, rscratch1, here, &nope); 532 bind(here); 533 534 // Fall through to the normal CAS-based lock, because no matter what 535 // the result of the above CAS, some thread must have succeeded in 536 // removing the bias bit from the object's header. 537 if (counters != NULL) { 538 atomic_incw(Address((address)counters->revoked_lock_entry_count_addr()), tmp_reg, 539 rscratch1, rscratch2); 540 } 541 bind(nope); 542 } 543 544 bind(cas_label); 545 546 return null_check_offset; 547 } 548 549 void MacroAssembler::biased_locking_exit(Register obj_reg, Register temp_reg, Label& done) { 550 assert(UseBiasedLocking, "why call this otherwise?"); 551 552 // Check for biased locking unlock case, which is a no-op 553 // Note: we do not have to check the thread ID for two reasons. 554 // First, the interpreter checks for IllegalMonitorStateException at 555 // a higher level. Second, if the bias was revoked while we held the 556 // lock, the object could not be rebiased toward another thread, so 557 // the bias bit would be clear. 558 ldr(temp_reg, Address(obj_reg, oopDesc::mark_offset_in_bytes())); 559 andr(temp_reg, temp_reg, markOopDesc::biased_lock_mask_in_place); 560 cmp(temp_reg, markOopDesc::biased_lock_pattern); 561 br(Assembler::EQ, done); 562 } 563 564 565 // added to make this compile 566 567 REGISTER_DEFINITION(Register, noreg); 568 569 static void pass_arg0(MacroAssembler* masm, Register arg) { 570 if (c_rarg0 != arg ) { 571 masm->mov(c_rarg0, arg); 572 } 573 } 574 575 static void pass_arg1(MacroAssembler* masm, Register arg) { 576 if (c_rarg1 != arg ) { 577 masm->mov(c_rarg1, arg); 578 } 579 } 580 581 static void pass_arg2(MacroAssembler* masm, Register arg) { 582 if (c_rarg2 != arg ) { 583 masm->mov(c_rarg2, arg); 584 } 585 } 586 587 static void pass_arg3(MacroAssembler* masm, Register arg) { 588 if (c_rarg3 != arg ) { 589 masm->mov(c_rarg3, arg); 590 } 591 } 592 593 void MacroAssembler::call_VM_base(Register oop_result, 594 Register java_thread, 595 Register last_java_sp, 596 address entry_point, 597 int number_of_arguments, 598 bool check_exceptions) { 599 // determine java_thread register 600 if (!java_thread->is_valid()) { 601 java_thread = rthread; 602 } 603 604 // determine last_java_sp register 605 if (!last_java_sp->is_valid()) { 606 last_java_sp = esp; 607 } 608 609 // debugging support 610 assert(number_of_arguments >= 0 , "cannot have negative number of arguments"); 611 assert(java_thread == rthread, "unexpected register"); 612 #ifdef ASSERT 613 // TraceBytecodes does not use r12 but saves it over the call, so don't verify 614 // if ((UseCompressedOops || UseCompressedClassPointers) && !TraceBytecodes) verify_heapbase("call_VM_base: heap base corrupted?"); 615 #endif // ASSERT 616 617 assert(java_thread != oop_result , "cannot use the same register for java_thread & oop_result"); 618 assert(java_thread != last_java_sp, "cannot use the same register for java_thread & last_java_sp"); 619 620 // push java thread (becomes first argument of C function) 621 622 mov(c_rarg0, java_thread); 623 624 // set last Java frame before call 625 assert(last_java_sp != rfp, "can't use rfp"); 626 627 Label l; 628 set_last_Java_frame(last_java_sp, rfp, l, rscratch1); 629 630 // do the call, remove parameters 631 MacroAssembler::call_VM_leaf_base(entry_point, number_of_arguments, &l); 632 633 // reset last Java frame 634 // Only interpreter should have to clear fp 635 reset_last_Java_frame(true, true); 636 637 // C++ interp handles this in the interpreter 638 check_and_handle_popframe(java_thread); 639 check_and_handle_earlyret(java_thread); 640 641 if (check_exceptions) { 642 // check for pending exceptions (java_thread is set upon return) 643 ldr(rscratch1, Address(java_thread, in_bytes(Thread::pending_exception_offset()))); 644 Label ok; 645 cbz(rscratch1, ok); 646 lea(rscratch1, RuntimeAddress(StubRoutines::forward_exception_entry())); 647 br(rscratch1); 648 bind(ok); 649 } 650 651 // get oop result if there is one and reset the value in the thread 652 if (oop_result->is_valid()) { 653 get_vm_result(oop_result, java_thread); 654 } 655 } 656 657 void MacroAssembler::call_VM_helper(Register oop_result, address entry_point, int number_of_arguments, bool check_exceptions) { 658 call_VM_base(oop_result, noreg, noreg, entry_point, number_of_arguments, check_exceptions); 659 } 660 661 // Maybe emit a call via a trampoline. If the code cache is small 662 // trampolines won't be emitted. 663 664 address MacroAssembler::trampoline_call(Address entry, CodeBuffer *cbuf) { 665 assert(entry.rspec().type() == relocInfo::runtime_call_type 666 || entry.rspec().type() == relocInfo::opt_virtual_call_type 667 || entry.rspec().type() == relocInfo::static_call_type 668 || entry.rspec().type() == relocInfo::virtual_call_type, "wrong reloc type"); 669 670 unsigned int start_offset = offset(); 671 if (far_branches() && !Compile::current()->in_scratch_emit_size()) { 672 address stub = emit_trampoline_stub(start_offset, entry.target()); 673 if (stub == NULL) { 674 return NULL; // CodeCache is full 675 } 676 } 677 678 if (cbuf) cbuf->set_insts_mark(); 679 relocate(entry.rspec()); 680 if (Assembler::reachable_from_branch_at(pc(), entry.target())) { 681 bl(entry.target()); 682 } else { 683 bl(pc()); 684 } 685 // just need to return a non-null address 686 return pc(); 687 } 688 689 690 // Emit a trampoline stub for a call to a target which is too far away. 691 // 692 // code sequences: 693 // 694 // call-site: 695 // branch-and-link to <destination> or <trampoline stub> 696 // 697 // Related trampoline stub for this call site in the stub section: 698 // load the call target from the constant pool 699 // branch (LR still points to the call site above) 700 701 address MacroAssembler::emit_trampoline_stub(int insts_call_instruction_offset, 702 address dest) { 703 address stub = start_a_stub(Compile::MAX_stubs_size/2); 704 if (stub == NULL) { 705 return NULL; // CodeBuffer::expand failed 706 } 707 708 // Create a trampoline stub relocation which relates this trampoline stub 709 // with the call instruction at insts_call_instruction_offset in the 710 // instructions code-section. 711 align(wordSize); 712 relocate(trampoline_stub_Relocation::spec(code()->insts()->start() 713 + insts_call_instruction_offset)); 714 const int stub_start_offset = offset(); 715 716 // Now, create the trampoline stub's code: 717 // - load the call 718 // - call 719 Label target; 720 ldr(rscratch1, target); 721 br(rscratch1); 722 bind(target); 723 assert(offset() - stub_start_offset == NativeCallTrampolineStub::data_offset, 724 "should be"); 725 emit_int64((int64_t)dest); 726 727 const address stub_start_addr = addr_at(stub_start_offset); 728 729 assert(is_NativeCallTrampolineStub_at(stub_start_addr), "doesn't look like a trampoline"); 730 731 end_a_stub(); 732 return stub; 733 } 734 735 address MacroAssembler::ic_call(address entry) { 736 RelocationHolder rh = virtual_call_Relocation::spec(pc()); 737 // address const_ptr = long_constant((jlong)Universe::non_oop_word()); 738 // unsigned long offset; 739 // ldr_constant(rscratch2, const_ptr); 740 movptr(rscratch2, (uintptr_t)Universe::non_oop_word()); 741 return trampoline_call(Address(entry, rh)); 742 } 743 744 // Implementation of call_VM versions 745 746 void MacroAssembler::call_VM(Register oop_result, 747 address entry_point, 748 bool check_exceptions) { 749 call_VM_helper(oop_result, entry_point, 0, check_exceptions); 750 } 751 752 void MacroAssembler::call_VM(Register oop_result, 753 address entry_point, 754 Register arg_1, 755 bool check_exceptions) { 756 pass_arg1(this, arg_1); 757 call_VM_helper(oop_result, entry_point, 1, check_exceptions); 758 } 759 760 void MacroAssembler::call_VM(Register oop_result, 761 address entry_point, 762 Register arg_1, 763 Register arg_2, 764 bool check_exceptions) { 765 assert(arg_1 != c_rarg2, "smashed arg"); 766 pass_arg2(this, arg_2); 767 pass_arg1(this, arg_1); 768 call_VM_helper(oop_result, entry_point, 2, check_exceptions); 769 } 770 771 void MacroAssembler::call_VM(Register oop_result, 772 address entry_point, 773 Register arg_1, 774 Register arg_2, 775 Register arg_3, 776 bool check_exceptions) { 777 assert(arg_1 != c_rarg3, "smashed arg"); 778 assert(arg_2 != c_rarg3, "smashed arg"); 779 pass_arg3(this, arg_3); 780 781 assert(arg_1 != c_rarg2, "smashed arg"); 782 pass_arg2(this, arg_2); 783 784 pass_arg1(this, arg_1); 785 call_VM_helper(oop_result, entry_point, 3, check_exceptions); 786 } 787 788 void MacroAssembler::call_VM(Register oop_result, 789 Register last_java_sp, 790 address entry_point, 791 int number_of_arguments, 792 bool check_exceptions) { 793 call_VM_base(oop_result, rthread, last_java_sp, entry_point, number_of_arguments, check_exceptions); 794 } 795 796 void MacroAssembler::call_VM(Register oop_result, 797 Register last_java_sp, 798 address entry_point, 799 Register arg_1, 800 bool check_exceptions) { 801 pass_arg1(this, arg_1); 802 call_VM(oop_result, last_java_sp, entry_point, 1, check_exceptions); 803 } 804 805 void MacroAssembler::call_VM(Register oop_result, 806 Register last_java_sp, 807 address entry_point, 808 Register arg_1, 809 Register arg_2, 810 bool check_exceptions) { 811 812 assert(arg_1 != c_rarg2, "smashed arg"); 813 pass_arg2(this, arg_2); 814 pass_arg1(this, arg_1); 815 call_VM(oop_result, last_java_sp, entry_point, 2, check_exceptions); 816 } 817 818 void MacroAssembler::call_VM(Register oop_result, 819 Register last_java_sp, 820 address entry_point, 821 Register arg_1, 822 Register arg_2, 823 Register arg_3, 824 bool check_exceptions) { 825 assert(arg_1 != c_rarg3, "smashed arg"); 826 assert(arg_2 != c_rarg3, "smashed arg"); 827 pass_arg3(this, arg_3); 828 assert(arg_1 != c_rarg2, "smashed arg"); 829 pass_arg2(this, arg_2); 830 pass_arg1(this, arg_1); 831 call_VM(oop_result, last_java_sp, entry_point, 3, check_exceptions); 832 } 833 834 835 void MacroAssembler::get_vm_result(Register oop_result, Register java_thread) { 836 ldr(oop_result, Address(java_thread, JavaThread::vm_result_offset())); 837 str(zr, Address(java_thread, JavaThread::vm_result_offset())); 838 verify_oop(oop_result, "broken oop in call_VM_base"); 839 } 840 841 void MacroAssembler::get_vm_result_2(Register metadata_result, Register java_thread) { 842 ldr(metadata_result, Address(java_thread, JavaThread::vm_result_2_offset())); 843 str(zr, Address(java_thread, JavaThread::vm_result_2_offset())); 844 } 845 846 void MacroAssembler::align(int modulus) { 847 while (offset() % modulus != 0) nop(); 848 } 849 850 // these are no-ops overridden by InterpreterMacroAssembler 851 852 void MacroAssembler::check_and_handle_earlyret(Register java_thread) { } 853 854 void MacroAssembler::check_and_handle_popframe(Register java_thread) { } 855 856 857 RegisterOrConstant MacroAssembler::delayed_value_impl(intptr_t* delayed_value_addr, 858 Register tmp, 859 int offset) { 860 intptr_t value = *delayed_value_addr; 861 if (value != 0) 862 return RegisterOrConstant(value + offset); 863 864 // load indirectly to solve generation ordering problem 865 ldr(tmp, ExternalAddress((address) delayed_value_addr)); 866 867 if (offset != 0) 868 add(tmp, tmp, offset); 869 870 return RegisterOrConstant(tmp); 871 } 872 873 874 void MacroAssembler:: notify(int type) { 875 if (type == bytecode_start) { 876 // set_last_Java_frame(esp, rfp, (address)NULL); 877 Assembler:: notify(type); 878 // reset_last_Java_frame(true, false); 879 } 880 else 881 Assembler:: notify(type); 882 } 883 884 // Look up the method for a megamorphic invokeinterface call. 885 // The target method is determined by <intf_klass, itable_index>. 886 // The receiver klass is in recv_klass. 887 // On success, the result will be in method_result, and execution falls through. 888 // On failure, execution transfers to the given label. 889 void MacroAssembler::lookup_interface_method(Register recv_klass, 890 Register intf_klass, 891 RegisterOrConstant itable_index, 892 Register method_result, 893 Register scan_temp, 894 Label& L_no_such_interface) { 895 assert_different_registers(recv_klass, intf_klass, method_result, scan_temp); 896 assert(itable_index.is_constant() || itable_index.as_register() == method_result, 897 "caller must use same register for non-constant itable index as for method"); 898 899 // Compute start of first itableOffsetEntry (which is at the end of the vtable) 900 int vtable_base = InstanceKlass::vtable_start_offset() * wordSize; 901 int itentry_off = itableMethodEntry::method_offset_in_bytes(); 902 int scan_step = itableOffsetEntry::size() * wordSize; 903 int vte_size = vtableEntry::size() * wordSize; 904 assert(vte_size == wordSize, "else adjust times_vte_scale"); 905 906 ldrw(scan_temp, Address(recv_klass, InstanceKlass::vtable_length_offset() * wordSize)); 907 908 // %%% Could store the aligned, prescaled offset in the klassoop. 909 // lea(scan_temp, Address(recv_klass, scan_temp, times_vte_scale, vtable_base)); 910 lea(scan_temp, Address(recv_klass, scan_temp, Address::lsl(3))); 911 add(scan_temp, scan_temp, vtable_base); 912 if (HeapWordsPerLong > 1) { 913 // Round up to align_object_offset boundary 914 // see code for instanceKlass::start_of_itable! 915 round_to(scan_temp, BytesPerLong); 916 } 917 918 // Adjust recv_klass by scaled itable_index, so we can free itable_index. 919 assert(itableMethodEntry::size() * wordSize == wordSize, "adjust the scaling in the code below"); 920 // lea(recv_klass, Address(recv_klass, itable_index, Address::times_ptr, itentry_off)); 921 lea(recv_klass, Address(recv_klass, itable_index, Address::lsl(3))); 922 if (itentry_off) 923 add(recv_klass, recv_klass, itentry_off); 924 925 // for (scan = klass->itable(); scan->interface() != NULL; scan += scan_step) { 926 // if (scan->interface() == intf) { 927 // result = (klass + scan->offset() + itable_index); 928 // } 929 // } 930 Label search, found_method; 931 932 for (int peel = 1; peel >= 0; peel--) { 933 ldr(method_result, Address(scan_temp, itableOffsetEntry::interface_offset_in_bytes())); 934 cmp(intf_klass, method_result); 935 936 if (peel) { 937 br(Assembler::EQ, found_method); 938 } else { 939 br(Assembler::NE, search); 940 // (invert the test to fall through to found_method...) 941 } 942 943 if (!peel) break; 944 945 bind(search); 946 947 // Check that the previous entry is non-null. A null entry means that 948 // the receiver class doesn't implement the interface, and wasn't the 949 // same as when the caller was compiled. 950 cbz(method_result, L_no_such_interface); 951 add(scan_temp, scan_temp, scan_step); 952 } 953 954 bind(found_method); 955 956 // Got a hit. 957 ldr(scan_temp, Address(scan_temp, itableOffsetEntry::offset_offset_in_bytes())); 958 ldr(method_result, Address(recv_klass, scan_temp)); 959 } 960 961 // virtual method calling 962 void MacroAssembler::lookup_virtual_method(Register recv_klass, 963 RegisterOrConstant vtable_index, 964 Register method_result) { 965 const int base = InstanceKlass::vtable_start_offset() * wordSize; 966 assert(vtableEntry::size() * wordSize == 8, 967 "adjust the scaling in the code below"); 968 int vtable_offset_in_bytes = base + vtableEntry::method_offset_in_bytes(); 969 970 if (vtable_index.is_register()) { 971 lea(method_result, Address(recv_klass, 972 vtable_index.as_register(), 973 Address::lsl(LogBytesPerWord))); 974 ldr(method_result, Address(method_result, vtable_offset_in_bytes)); 975 } else { 976 vtable_offset_in_bytes += vtable_index.as_constant() * wordSize; 977 ldr(method_result, Address(recv_klass, vtable_offset_in_bytes)); 978 } 979 } 980 981 void MacroAssembler::check_klass_subtype(Register sub_klass, 982 Register super_klass, 983 Register temp_reg, 984 Label& L_success) { 985 Label L_failure; 986 check_klass_subtype_fast_path(sub_klass, super_klass, temp_reg, &L_success, &L_failure, NULL); 987 check_klass_subtype_slow_path(sub_klass, super_klass, temp_reg, noreg, &L_success, NULL); 988 bind(L_failure); 989 } 990 991 992 void MacroAssembler::check_klass_subtype_fast_path(Register sub_klass, 993 Register super_klass, 994 Register temp_reg, 995 Label* L_success, 996 Label* L_failure, 997 Label* L_slow_path, 998 RegisterOrConstant super_check_offset) { 999 assert_different_registers(sub_klass, super_klass, temp_reg); 1000 bool must_load_sco = (super_check_offset.constant_or_zero() == -1); 1001 if (super_check_offset.is_register()) { 1002 assert_different_registers(sub_klass, super_klass, 1003 super_check_offset.as_register()); 1004 } else if (must_load_sco) { 1005 assert(temp_reg != noreg, "supply either a temp or a register offset"); 1006 } 1007 1008 Label L_fallthrough; 1009 int label_nulls = 0; 1010 if (L_success == NULL) { L_success = &L_fallthrough; label_nulls++; } 1011 if (L_failure == NULL) { L_failure = &L_fallthrough; label_nulls++; } 1012 if (L_slow_path == NULL) { L_slow_path = &L_fallthrough; label_nulls++; } 1013 assert(label_nulls <= 1, "at most one NULL in the batch"); 1014 1015 int sc_offset = in_bytes(Klass::secondary_super_cache_offset()); 1016 int sco_offset = in_bytes(Klass::super_check_offset_offset()); 1017 Address super_check_offset_addr(super_klass, sco_offset); 1018 1019 // Hacked jmp, which may only be used just before L_fallthrough. 1020 #define final_jmp(label) \ 1021 if (&(label) == &L_fallthrough) { /*do nothing*/ } \ 1022 else b(label) /*omit semi*/ 1023 1024 // If the pointers are equal, we are done (e.g., String[] elements). 1025 // This self-check enables sharing of secondary supertype arrays among 1026 // non-primary types such as array-of-interface. Otherwise, each such 1027 // type would need its own customized SSA. 1028 // We move this check to the front of the fast path because many 1029 // type checks are in fact trivially successful in this manner, 1030 // so we get a nicely predicted branch right at the start of the check. 1031 cmp(sub_klass, super_klass); 1032 br(Assembler::EQ, *L_success); 1033 1034 // Check the supertype display: 1035 if (must_load_sco) { 1036 ldrw(temp_reg, super_check_offset_addr); 1037 super_check_offset = RegisterOrConstant(temp_reg); 1038 } 1039 Address super_check_addr(sub_klass, super_check_offset); 1040 ldr(rscratch1, super_check_addr); 1041 cmp(super_klass, rscratch1); // load displayed supertype 1042 1043 // This check has worked decisively for primary supers. 1044 // Secondary supers are sought in the super_cache ('super_cache_addr'). 1045 // (Secondary supers are interfaces and very deeply nested subtypes.) 1046 // This works in the same check above because of a tricky aliasing 1047 // between the super_cache and the primary super display elements. 1048 // (The 'super_check_addr' can address either, as the case requires.) 1049 // Note that the cache is updated below if it does not help us find 1050 // what we need immediately. 1051 // So if it was a primary super, we can just fail immediately. 1052 // Otherwise, it's the slow path for us (no success at this point). 1053 1054 if (super_check_offset.is_register()) { 1055 br(Assembler::EQ, *L_success); 1056 cmp(super_check_offset.as_register(), sc_offset); 1057 if (L_failure == &L_fallthrough) { 1058 br(Assembler::EQ, *L_slow_path); 1059 } else { 1060 br(Assembler::NE, *L_failure); 1061 final_jmp(*L_slow_path); 1062 } 1063 } else if (super_check_offset.as_constant() == sc_offset) { 1064 // Need a slow path; fast failure is impossible. 1065 if (L_slow_path == &L_fallthrough) { 1066 br(Assembler::EQ, *L_success); 1067 } else { 1068 br(Assembler::NE, *L_slow_path); 1069 final_jmp(*L_success); 1070 } 1071 } else { 1072 // No slow path; it's a fast decision. 1073 if (L_failure == &L_fallthrough) { 1074 br(Assembler::EQ, *L_success); 1075 } else { 1076 br(Assembler::NE, *L_failure); 1077 final_jmp(*L_success); 1078 } 1079 } 1080 1081 bind(L_fallthrough); 1082 1083 #undef final_jmp 1084 } 1085 1086 // These two are taken from x86, but they look generally useful 1087 1088 // scans count pointer sized words at [addr] for occurence of value, 1089 // generic 1090 void MacroAssembler::repne_scan(Register addr, Register value, Register count, 1091 Register scratch) { 1092 Label Lloop, Lexit; 1093 cbz(count, Lexit); 1094 bind(Lloop); 1095 ldr(scratch, post(addr, wordSize)); 1096 cmp(value, scratch); 1097 br(EQ, Lexit); 1098 sub(count, count, 1); 1099 cbnz(count, Lloop); 1100 bind(Lexit); 1101 } 1102 1103 // scans count 4 byte words at [addr] for occurence of value, 1104 // generic 1105 void MacroAssembler::repne_scanw(Register addr, Register value, Register count, 1106 Register scratch) { 1107 Label Lloop, Lexit; 1108 cbz(count, Lexit); 1109 bind(Lloop); 1110 ldrw(scratch, post(addr, wordSize)); 1111 cmpw(value, scratch); 1112 br(EQ, Lexit); 1113 sub(count, count, 1); 1114 cbnz(count, Lloop); 1115 bind(Lexit); 1116 } 1117 1118 void MacroAssembler::check_klass_subtype_slow_path(Register sub_klass, 1119 Register super_klass, 1120 Register temp_reg, 1121 Register temp2_reg, 1122 Label* L_success, 1123 Label* L_failure, 1124 bool set_cond_codes) { 1125 assert_different_registers(sub_klass, super_klass, temp_reg); 1126 if (temp2_reg != noreg) 1127 assert_different_registers(sub_klass, super_klass, temp_reg, temp2_reg, rscratch1); 1128 #define IS_A_TEMP(reg) ((reg) == temp_reg || (reg) == temp2_reg) 1129 1130 Label L_fallthrough; 1131 int label_nulls = 0; 1132 if (L_success == NULL) { L_success = &L_fallthrough; label_nulls++; } 1133 if (L_failure == NULL) { L_failure = &L_fallthrough; label_nulls++; } 1134 assert(label_nulls <= 1, "at most one NULL in the batch"); 1135 1136 // a couple of useful fields in sub_klass: 1137 int ss_offset = in_bytes(Klass::secondary_supers_offset()); 1138 int sc_offset = in_bytes(Klass::secondary_super_cache_offset()); 1139 Address secondary_supers_addr(sub_klass, ss_offset); 1140 Address super_cache_addr( sub_klass, sc_offset); 1141 1142 BLOCK_COMMENT("check_klass_subtype_slow_path"); 1143 1144 // Do a linear scan of the secondary super-klass chain. 1145 // This code is rarely used, so simplicity is a virtue here. 1146 // The repne_scan instruction uses fixed registers, which we must spill. 1147 // Don't worry too much about pre-existing connections with the input regs. 1148 1149 assert(sub_klass != r0, "killed reg"); // killed by mov(r0, super) 1150 assert(sub_klass != r2, "killed reg"); // killed by lea(r2, &pst_counter) 1151 1152 // Get super_klass value into r0 (even if it was in r5 or r2). 1153 RegSet pushed_registers; 1154 if (!IS_A_TEMP(r2)) pushed_registers += r2; 1155 if (!IS_A_TEMP(r5)) pushed_registers += r5; 1156 1157 if (super_klass != r0 || UseCompressedOops) { 1158 if (!IS_A_TEMP(r0)) pushed_registers += r0; 1159 } 1160 1161 push(pushed_registers, sp); 1162 1163 #ifndef PRODUCT 1164 mov(rscratch2, (address)&SharedRuntime::_partial_subtype_ctr); 1165 Address pst_counter_addr(rscratch2); 1166 ldr(rscratch1, pst_counter_addr); 1167 add(rscratch1, rscratch1, 1); 1168 str(rscratch1, pst_counter_addr); 1169 #endif //PRODUCT 1170 1171 // We will consult the secondary-super array. 1172 ldr(r5, secondary_supers_addr); 1173 // Load the array length. 1174 ldrw(r2, Address(r5, Array<Klass*>::length_offset_in_bytes())); 1175 // Skip to start of data. 1176 add(r5, r5, Array<Klass*>::base_offset_in_bytes()); 1177 1178 cmp(sp, zr); // Clear Z flag; SP is never zero 1179 // Scan R2 words at [R5] for an occurrence of R0. 1180 // Set NZ/Z based on last compare. 1181 repne_scan(r5, r0, r2, rscratch1); 1182 1183 // Unspill the temp. registers: 1184 pop(pushed_registers, sp); 1185 1186 br(Assembler::NE, *L_failure); 1187 1188 // Success. Cache the super we found and proceed in triumph. 1189 str(super_klass, super_cache_addr); 1190 1191 if (L_success != &L_fallthrough) { 1192 b(*L_success); 1193 } 1194 1195 #undef IS_A_TEMP 1196 1197 bind(L_fallthrough); 1198 } 1199 1200 1201 void MacroAssembler::verify_oop(Register reg, const char* s) { 1202 if (!VerifyOops) return; 1203 1204 // Pass register number to verify_oop_subroutine 1205 const char* b = NULL; 1206 { 1207 ResourceMark rm; 1208 stringStream ss; 1209 ss.print("verify_oop: %s: %s", reg->name(), s); 1210 b = code_string(ss.as_string()); 1211 } 1212 BLOCK_COMMENT("verify_oop {"); 1213 1214 stp(r0, rscratch1, Address(pre(sp, -2 * wordSize))); 1215 stp(rscratch2, lr, Address(pre(sp, -2 * wordSize))); 1216 1217 mov(r0, reg); 1218 mov(rscratch1, (address)b); 1219 1220 // call indirectly to solve generation ordering problem 1221 lea(rscratch2, ExternalAddress(StubRoutines::verify_oop_subroutine_entry_address())); 1222 ldr(rscratch2, Address(rscratch2)); 1223 blr(rscratch2); 1224 1225 ldp(rscratch2, lr, Address(post(sp, 2 * wordSize))); 1226 ldp(r0, rscratch1, Address(post(sp, 2 * wordSize))); 1227 1228 BLOCK_COMMENT("} verify_oop"); 1229 } 1230 1231 void MacroAssembler::verify_oop_addr(Address addr, const char* s) { 1232 if (!VerifyOops) return; 1233 1234 const char* b = NULL; 1235 { 1236 ResourceMark rm; 1237 stringStream ss; 1238 ss.print("verify_oop_addr: %s", s); 1239 b = code_string(ss.as_string()); 1240 } 1241 BLOCK_COMMENT("verify_oop_addr {"); 1242 1243 stp(r0, rscratch1, Address(pre(sp, -2 * wordSize))); 1244 stp(rscratch2, lr, Address(pre(sp, -2 * wordSize))); 1245 1246 // addr may contain sp so we will have to adjust it based on the 1247 // pushes that we just did. 1248 if (addr.uses(sp)) { 1249 lea(r0, addr); 1250 ldr(r0, Address(r0, 4 * wordSize)); 1251 } else { 1252 ldr(r0, addr); 1253 } 1254 mov(rscratch1, (address)b); 1255 1256 // call indirectly to solve generation ordering problem 1257 lea(rscratch2, ExternalAddress(StubRoutines::verify_oop_subroutine_entry_address())); 1258 ldr(rscratch2, Address(rscratch2)); 1259 blr(rscratch2); 1260 1261 ldp(rscratch2, lr, Address(post(sp, 2 * wordSize))); 1262 ldp(r0, rscratch1, Address(post(sp, 2 * wordSize))); 1263 1264 BLOCK_COMMENT("} verify_oop_addr"); 1265 } 1266 1267 Address MacroAssembler::argument_address(RegisterOrConstant arg_slot, 1268 int extra_slot_offset) { 1269 // cf. TemplateTable::prepare_invoke(), if (load_receiver). 1270 int stackElementSize = Interpreter::stackElementSize; 1271 int offset = Interpreter::expr_offset_in_bytes(extra_slot_offset+0); 1272 #ifdef ASSERT 1273 int offset1 = Interpreter::expr_offset_in_bytes(extra_slot_offset+1); 1274 assert(offset1 - offset == stackElementSize, "correct arithmetic"); 1275 #endif 1276 if (arg_slot.is_constant()) { 1277 return Address(esp, arg_slot.as_constant() * stackElementSize 1278 + offset); 1279 } else { 1280 add(rscratch1, esp, arg_slot.as_register(), 1281 ext::uxtx, exact_log2(stackElementSize)); 1282 return Address(rscratch1, offset); 1283 } 1284 } 1285 1286 void MacroAssembler::call_VM_leaf_base(address entry_point, 1287 int number_of_arguments, 1288 Label *retaddr) { 1289 call_VM_leaf_base1(entry_point, number_of_arguments, 0, ret_type_integral, retaddr); 1290 } 1291 1292 void MacroAssembler::call_VM_leaf_base1(address entry_point, 1293 int number_of_gp_arguments, 1294 int number_of_fp_arguments, 1295 ret_type type, 1296 Label *retaddr) { 1297 Label E, L; 1298 1299 stp(rscratch1, rmethod, Address(pre(sp, -2 * wordSize))); 1300 1301 // We add 1 to number_of_arguments because the thread in arg0 is 1302 // not counted 1303 mov(rscratch1, entry_point); 1304 blrt(rscratch1, number_of_gp_arguments + 1, number_of_fp_arguments, type); 1305 if (retaddr) 1306 bind(*retaddr); 1307 1308 ldp(rscratch1, rmethod, Address(post(sp, 2 * wordSize))); 1309 maybe_isb(); 1310 } 1311 1312 void MacroAssembler::call_VM_leaf(address entry_point, int number_of_arguments) { 1313 call_VM_leaf_base(entry_point, number_of_arguments); 1314 } 1315 1316 void MacroAssembler::call_VM_leaf(address entry_point, Register arg_0) { 1317 pass_arg0(this, arg_0); 1318 call_VM_leaf_base(entry_point, 1); 1319 } 1320 1321 void MacroAssembler::call_VM_leaf(address entry_point, Register arg_0, Register arg_1) { 1322 pass_arg0(this, arg_0); 1323 pass_arg1(this, arg_1); 1324 call_VM_leaf_base(entry_point, 2); 1325 } 1326 1327 void MacroAssembler::call_VM_leaf(address entry_point, Register arg_0, 1328 Register arg_1, Register arg_2) { 1329 pass_arg0(this, arg_0); 1330 pass_arg1(this, arg_1); 1331 pass_arg2(this, arg_2); 1332 call_VM_leaf_base(entry_point, 3); 1333 } 1334 1335 void MacroAssembler::super_call_VM_leaf(address entry_point, Register arg_0) { 1336 pass_arg0(this, arg_0); 1337 MacroAssembler::call_VM_leaf_base(entry_point, 1); 1338 } 1339 1340 void MacroAssembler::super_call_VM_leaf(address entry_point, Register arg_0, Register arg_1) { 1341 1342 assert(arg_0 != c_rarg1, "smashed arg"); 1343 pass_arg1(this, arg_1); 1344 pass_arg0(this, arg_0); 1345 MacroAssembler::call_VM_leaf_base(entry_point, 2); 1346 } 1347 1348 void MacroAssembler::super_call_VM_leaf(address entry_point, Register arg_0, Register arg_1, Register arg_2) { 1349 assert(arg_0 != c_rarg2, "smashed arg"); 1350 assert(arg_1 != c_rarg2, "smashed arg"); 1351 pass_arg2(this, arg_2); 1352 assert(arg_0 != c_rarg1, "smashed arg"); 1353 pass_arg1(this, arg_1); 1354 pass_arg0(this, arg_0); 1355 MacroAssembler::call_VM_leaf_base(entry_point, 3); 1356 } 1357 1358 void MacroAssembler::super_call_VM_leaf(address entry_point, Register arg_0, Register arg_1, Register arg_2, Register arg_3) { 1359 assert(arg_0 != c_rarg3, "smashed arg"); 1360 assert(arg_1 != c_rarg3, "smashed arg"); 1361 assert(arg_2 != c_rarg3, "smashed arg"); 1362 pass_arg3(this, arg_3); 1363 assert(arg_0 != c_rarg2, "smashed arg"); 1364 assert(arg_1 != c_rarg2, "smashed arg"); 1365 pass_arg2(this, arg_2); 1366 assert(arg_0 != c_rarg1, "smashed arg"); 1367 pass_arg1(this, arg_1); 1368 pass_arg0(this, arg_0); 1369 MacroAssembler::call_VM_leaf_base(entry_point, 4); 1370 } 1371 1372 void MacroAssembler::null_check(Register reg, int offset) { 1373 if (needs_explicit_null_check(offset)) { 1374 // provoke OS NULL exception if reg = NULL by 1375 // accessing M[reg] w/o changing any registers 1376 // NOTE: this is plenty to provoke a segv 1377 ldr(zr, Address(reg)); 1378 } else { 1379 // nothing to do, (later) access of M[reg + offset] 1380 // will provoke OS NULL exception if reg = NULL 1381 } 1382 } 1383 1384 // MacroAssembler protected routines needed to implement 1385 // public methods 1386 1387 void MacroAssembler::mov(Register r, Address dest) { 1388 code_section()->relocate(pc(), dest.rspec()); 1389 u_int64_t imm64 = (u_int64_t)dest.target(); 1390 movptr(r, imm64); 1391 } 1392 1393 // Move a constant pointer into r. In AArch64 mode the virtual 1394 // address space is 48 bits in size, so we only need three 1395 // instructions to create a patchable instruction sequence that can 1396 // reach anywhere. 1397 void MacroAssembler::movptr(Register r, uintptr_t imm64) { 1398 #ifndef PRODUCT 1399 { 1400 char buffer[64]; 1401 snprintf(buffer, sizeof(buffer), "0x%"PRIX64, imm64); 1402 block_comment(buffer); 1403 } 1404 #endif 1405 assert(imm64 < (1ul << 48), "48-bit overflow in address constant"); 1406 movz(r, imm64 & 0xffff); 1407 imm64 >>= 16; 1408 movk(r, imm64 & 0xffff, 16); 1409 imm64 >>= 16; 1410 movk(r, imm64 & 0xffff, 32); 1411 } 1412 1413 // Macro to mov replicated immediate to vector register. 1414 // Vd will get the following values for different arrangements in T 1415 // imm32 == hex 000000gh T8B: Vd = ghghghghghghghgh 1416 // imm32 == hex 000000gh T16B: Vd = ghghghghghghghghghghghghghghghgh 1417 // imm32 == hex 0000efgh T4H: Vd = efghefghefghefgh 1418 // imm32 == hex 0000efgh T8H: Vd = efghefghefghefghefghefghefghefgh 1419 // imm32 == hex abcdefgh T2S: Vd = abcdefghabcdefgh 1420 // imm32 == hex abcdefgh T4S: Vd = abcdefghabcdefghabcdefghabcdefgh 1421 // T1D/T2D: invalid 1422 void MacroAssembler::mov(FloatRegister Vd, SIMD_Arrangement T, u_int32_t imm32) { 1423 assert(T != T1D && T != T2D, "invalid arrangement"); 1424 if (T == T8B || T == T16B) { 1425 assert((imm32 & ~0xff) == 0, "extraneous bits in unsigned imm32 (T8B/T16B)"); 1426 movi(Vd, T, imm32 & 0xff, 0); 1427 return; 1428 } 1429 u_int32_t nimm32 = ~imm32; 1430 if (T == T4H || T == T8H) { 1431 assert((imm32 & ~0xffff) == 0, "extraneous bits in unsigned imm32 (T4H/T8H)"); 1432 imm32 &= 0xffff; 1433 nimm32 &= 0xffff; 1434 } 1435 u_int32_t x = imm32; 1436 int movi_cnt = 0; 1437 int movn_cnt = 0; 1438 while (x) { if (x & 0xff) movi_cnt++; x >>= 8; } 1439 x = nimm32; 1440 while (x) { if (x & 0xff) movn_cnt++; x >>= 8; } 1441 if (movn_cnt < movi_cnt) imm32 = nimm32; 1442 unsigned lsl = 0; 1443 while (imm32 && (imm32 & 0xff) == 0) { lsl += 8; imm32 >>= 8; } 1444 if (movn_cnt < movi_cnt) 1445 mvni(Vd, T, imm32 & 0xff, lsl); 1446 else 1447 movi(Vd, T, imm32 & 0xff, lsl); 1448 imm32 >>= 8; lsl += 8; 1449 while (imm32) { 1450 while ((imm32 & 0xff) == 0) { lsl += 8; imm32 >>= 8; } 1451 if (movn_cnt < movi_cnt) 1452 bici(Vd, T, imm32 & 0xff, lsl); 1453 else 1454 orri(Vd, T, imm32 & 0xff, lsl); 1455 lsl += 8; imm32 >>= 8; 1456 } 1457 } 1458 1459 void MacroAssembler::mov_immediate64(Register dst, u_int64_t imm64) 1460 { 1461 #ifndef PRODUCT 1462 { 1463 char buffer[64]; 1464 snprintf(buffer, sizeof(buffer), "0x%"PRIX64, imm64); 1465 block_comment(buffer); 1466 } 1467 #endif 1468 if (operand_valid_for_logical_immediate(false, imm64)) { 1469 orr(dst, zr, imm64); 1470 } else { 1471 // we can use a combination of MOVZ or MOVN with 1472 // MOVK to build up the constant 1473 u_int64_t imm_h[4]; 1474 int zero_count = 0; 1475 int neg_count = 0; 1476 int i; 1477 for (i = 0; i < 4; i++) { 1478 imm_h[i] = ((imm64 >> (i * 16)) & 0xffffL); 1479 if (imm_h[i] == 0) { 1480 zero_count++; 1481 } else if (imm_h[i] == 0xffffL) { 1482 neg_count++; 1483 } 1484 } 1485 if (zero_count == 4) { 1486 // one MOVZ will do 1487 movz(dst, 0); 1488 } else if (neg_count == 4) { 1489 // one MOVN will do 1490 movn(dst, 0); 1491 } else if (zero_count == 3) { 1492 for (i = 0; i < 4; i++) { 1493 if (imm_h[i] != 0L) { 1494 movz(dst, (u_int32_t)imm_h[i], (i << 4)); 1495 break; 1496 } 1497 } 1498 } else if (neg_count == 3) { 1499 // one MOVN will do 1500 for (int i = 0; i < 4; i++) { 1501 if (imm_h[i] != 0xffffL) { 1502 movn(dst, (u_int32_t)imm_h[i] ^ 0xffffL, (i << 4)); 1503 break; 1504 } 1505 } 1506 } else if (zero_count == 2) { 1507 // one MOVZ and one MOVK will do 1508 for (i = 0; i < 3; i++) { 1509 if (imm_h[i] != 0L) { 1510 movz(dst, (u_int32_t)imm_h[i], (i << 4)); 1511 i++; 1512 break; 1513 } 1514 } 1515 for (;i < 4; i++) { 1516 if (imm_h[i] != 0L) { 1517 movk(dst, (u_int32_t)imm_h[i], (i << 4)); 1518 } 1519 } 1520 } else if (neg_count == 2) { 1521 // one MOVN and one MOVK will do 1522 for (i = 0; i < 4; i++) { 1523 if (imm_h[i] != 0xffffL) { 1524 movn(dst, (u_int32_t)imm_h[i] ^ 0xffffL, (i << 4)); 1525 i++; 1526 break; 1527 } 1528 } 1529 for (;i < 4; i++) { 1530 if (imm_h[i] != 0xffffL) { 1531 movk(dst, (u_int32_t)imm_h[i], (i << 4)); 1532 } 1533 } 1534 } else if (zero_count == 1) { 1535 // one MOVZ and two MOVKs will do 1536 for (i = 0; i < 4; i++) { 1537 if (imm_h[i] != 0L) { 1538 movz(dst, (u_int32_t)imm_h[i], (i << 4)); 1539 i++; 1540 break; 1541 } 1542 } 1543 for (;i < 4; i++) { 1544 if (imm_h[i] != 0x0L) { 1545 movk(dst, (u_int32_t)imm_h[i], (i << 4)); 1546 } 1547 } 1548 } else if (neg_count == 1) { 1549 // one MOVN and two MOVKs will do 1550 for (i = 0; i < 4; i++) { 1551 if (imm_h[i] != 0xffffL) { 1552 movn(dst, (u_int32_t)imm_h[i] ^ 0xffffL, (i << 4)); 1553 i++; 1554 break; 1555 } 1556 } 1557 for (;i < 4; i++) { 1558 if (imm_h[i] != 0xffffL) { 1559 movk(dst, (u_int32_t)imm_h[i], (i << 4)); 1560 } 1561 } 1562 } else { 1563 // use a MOVZ and 3 MOVKs (makes it easier to debug) 1564 movz(dst, (u_int32_t)imm_h[0], 0); 1565 for (i = 1; i < 4; i++) { 1566 movk(dst, (u_int32_t)imm_h[i], (i << 4)); 1567 } 1568 } 1569 } 1570 } 1571 1572 void MacroAssembler::mov_immediate32(Register dst, u_int32_t imm32) 1573 { 1574 #ifndef PRODUCT 1575 { 1576 char buffer[64]; 1577 snprintf(buffer, sizeof(buffer), "0x%"PRIX32, imm32); 1578 block_comment(buffer); 1579 } 1580 #endif 1581 if (operand_valid_for_logical_immediate(true, imm32)) { 1582 orrw(dst, zr, imm32); 1583 } else { 1584 // we can use MOVZ, MOVN or two calls to MOVK to build up the 1585 // constant 1586 u_int32_t imm_h[2]; 1587 imm_h[0] = imm32 & 0xffff; 1588 imm_h[1] = ((imm32 >> 16) & 0xffff); 1589 if (imm_h[0] == 0) { 1590 movzw(dst, imm_h[1], 16); 1591 } else if (imm_h[0] == 0xffff) { 1592 movnw(dst, imm_h[1] ^ 0xffff, 16); 1593 } else if (imm_h[1] == 0) { 1594 movzw(dst, imm_h[0], 0); 1595 } else if (imm_h[1] == 0xffff) { 1596 movnw(dst, imm_h[0] ^ 0xffff, 0); 1597 } else { 1598 // use a MOVZ and MOVK (makes it easier to debug) 1599 movzw(dst, imm_h[0], 0); 1600 movkw(dst, imm_h[1], 16); 1601 } 1602 } 1603 } 1604 1605 // Form an address from base + offset in Rd. Rd may or may 1606 // not actually be used: you must use the Address that is returned. 1607 // It is up to you to ensure that the shift provided matches the size 1608 // of your data. 1609 Address MacroAssembler::form_address(Register Rd, Register base, long byte_offset, int shift) { 1610 if (Address::offset_ok_for_immed(byte_offset, shift)) 1611 // It fits; no need for any heroics 1612 return Address(base, byte_offset); 1613 1614 // Don't do anything clever with negative or misaligned offsets 1615 unsigned mask = (1 << shift) - 1; 1616 if (byte_offset < 0 || byte_offset & mask) { 1617 mov(Rd, byte_offset); 1618 add(Rd, base, Rd); 1619 return Address(Rd); 1620 } 1621 1622 // See if we can do this with two 12-bit offsets 1623 { 1624 unsigned long word_offset = byte_offset >> shift; 1625 unsigned long masked_offset = word_offset & 0xfff000; 1626 if (Address::offset_ok_for_immed(word_offset - masked_offset) 1627 && Assembler::operand_valid_for_add_sub_immediate(masked_offset << shift)) { 1628 add(Rd, base, masked_offset << shift); 1629 word_offset -= masked_offset; 1630 return Address(Rd, word_offset << shift); 1631 } 1632 } 1633 1634 // Do it the hard way 1635 mov(Rd, byte_offset); 1636 add(Rd, base, Rd); 1637 return Address(Rd); 1638 } 1639 1640 void MacroAssembler::atomic_incw(Register counter_addr, Register tmp, Register tmp2) { 1641 Label retry_load; 1642 bind(retry_load); 1643 // flush and load exclusive from the memory location 1644 ldxrw(tmp, counter_addr); 1645 addw(tmp, tmp, 1); 1646 // if we store+flush with no intervening write tmp wil be zero 1647 stxrw(tmp2, tmp, counter_addr); 1648 cbnzw(tmp2, retry_load); 1649 } 1650 1651 1652 int MacroAssembler::corrected_idivl(Register result, Register ra, Register rb, 1653 bool want_remainder, Register scratch) 1654 { 1655 // Full implementation of Java idiv and irem. The function 1656 // returns the (pc) offset of the div instruction - may be needed 1657 // for implicit exceptions. 1658 // 1659 // constraint : ra/rb =/= scratch 1660 // normal case 1661 // 1662 // input : ra: dividend 1663 // rb: divisor 1664 // 1665 // result: either 1666 // quotient (= ra idiv rb) 1667 // remainder (= ra irem rb) 1668 1669 assert(ra != scratch && rb != scratch, "reg cannot be scratch"); 1670 1671 int idivl_offset = offset(); 1672 if (! want_remainder) { 1673 sdivw(result, ra, rb); 1674 } else { 1675 sdivw(scratch, ra, rb); 1676 Assembler::msubw(result, scratch, rb, ra); 1677 } 1678 1679 return idivl_offset; 1680 } 1681 1682 int MacroAssembler::corrected_idivq(Register result, Register ra, Register rb, 1683 bool want_remainder, Register scratch) 1684 { 1685 // Full implementation of Java ldiv and lrem. The function 1686 // returns the (pc) offset of the div instruction - may be needed 1687 // for implicit exceptions. 1688 // 1689 // constraint : ra/rb =/= scratch 1690 // normal case 1691 // 1692 // input : ra: dividend 1693 // rb: divisor 1694 // 1695 // result: either 1696 // quotient (= ra idiv rb) 1697 // remainder (= ra irem rb) 1698 1699 assert(ra != scratch && rb != scratch, "reg cannot be scratch"); 1700 1701 int idivq_offset = offset(); 1702 if (! want_remainder) { 1703 sdiv(result, ra, rb); 1704 } else { 1705 sdiv(scratch, ra, rb); 1706 Assembler::msub(result, scratch, rb, ra); 1707 } 1708 1709 return idivq_offset; 1710 } 1711 1712 void MacroAssembler::membar(Membar_mask_bits order_constraint) { 1713 address prev = pc() - NativeMembar::instruction_size; 1714 if (prev == code()->last_membar()) { 1715 NativeMembar *bar = NativeMembar_at(prev); 1716 // We are merging two memory barrier instructions. On AArch64 we 1717 // can do this simply by ORing them together. 1718 bar->set_kind(bar->get_kind() | order_constraint); 1719 BLOCK_COMMENT("merged membar"); 1720 } else { 1721 code()->set_last_membar(pc()); 1722 dmb(Assembler::barrier(order_constraint)); 1723 } 1724 } 1725 1726 // MacroAssembler routines found actually to be needed 1727 1728 void MacroAssembler::push(Register src) 1729 { 1730 str(src, Address(pre(esp, -1 * wordSize))); 1731 } 1732 1733 void MacroAssembler::pop(Register dst) 1734 { 1735 ldr(dst, Address(post(esp, 1 * wordSize))); 1736 } 1737 1738 // Note: load_unsigned_short used to be called load_unsigned_word. 1739 int MacroAssembler::load_unsigned_short(Register dst, Address src) { 1740 int off = offset(); 1741 ldrh(dst, src); 1742 return off; 1743 } 1744 1745 int MacroAssembler::load_unsigned_byte(Register dst, Address src) { 1746 int off = offset(); 1747 ldrb(dst, src); 1748 return off; 1749 } 1750 1751 int MacroAssembler::load_signed_short(Register dst, Address src) { 1752 int off = offset(); 1753 ldrsh(dst, src); 1754 return off; 1755 } 1756 1757 int MacroAssembler::load_signed_byte(Register dst, Address src) { 1758 int off = offset(); 1759 ldrsb(dst, src); 1760 return off; 1761 } 1762 1763 int MacroAssembler::load_signed_short32(Register dst, Address src) { 1764 int off = offset(); 1765 ldrshw(dst, src); 1766 return off; 1767 } 1768 1769 int MacroAssembler::load_signed_byte32(Register dst, Address src) { 1770 int off = offset(); 1771 ldrsbw(dst, src); 1772 return off; 1773 } 1774 1775 void MacroAssembler::load_sized_value(Register dst, Address src, size_t size_in_bytes, bool is_signed, Register dst2) { 1776 switch (size_in_bytes) { 1777 case 8: ldr(dst, src); break; 1778 case 4: ldrw(dst, src); break; 1779 case 2: is_signed ? load_signed_short(dst, src) : load_unsigned_short(dst, src); break; 1780 case 1: is_signed ? load_signed_byte( dst, src) : load_unsigned_byte( dst, src); break; 1781 default: ShouldNotReachHere(); 1782 } 1783 } 1784 1785 void MacroAssembler::store_sized_value(Address dst, Register src, size_t size_in_bytes, Register src2) { 1786 switch (size_in_bytes) { 1787 case 8: str(src, dst); break; 1788 case 4: strw(src, dst); break; 1789 case 2: strh(src, dst); break; 1790 case 1: strb(src, dst); break; 1791 default: ShouldNotReachHere(); 1792 } 1793 } 1794 1795 void MacroAssembler::decrementw(Register reg, int value) 1796 { 1797 if (value < 0) { incrementw(reg, -value); return; } 1798 if (value == 0) { return; } 1799 if (value < (1 << 12)) { subw(reg, reg, value); return; } 1800 /* else */ { 1801 guarantee(reg != rscratch2, "invalid dst for register decrement"); 1802 movw(rscratch2, (unsigned)value); 1803 subw(reg, reg, rscratch2); 1804 } 1805 } 1806 1807 void MacroAssembler::decrement(Register reg, int value) 1808 { 1809 if (value < 0) { increment(reg, -value); return; } 1810 if (value == 0) { return; } 1811 if (value < (1 << 12)) { sub(reg, reg, value); return; } 1812 /* else */ { 1813 assert(reg != rscratch2, "invalid dst for register decrement"); 1814 mov(rscratch2, (unsigned long)value); 1815 sub(reg, reg, rscratch2); 1816 } 1817 } 1818 1819 void MacroAssembler::decrementw(Address dst, int value) 1820 { 1821 assert(!dst.uses(rscratch1), "invalid dst for address decrement"); 1822 ldrw(rscratch1, dst); 1823 decrementw(rscratch1, value); 1824 strw(rscratch1, dst); 1825 } 1826 1827 void MacroAssembler::decrement(Address dst, int value) 1828 { 1829 assert(!dst.uses(rscratch1), "invalid address for decrement"); 1830 ldr(rscratch1, dst); 1831 decrement(rscratch1, value); 1832 str(rscratch1, dst); 1833 } 1834 1835 void MacroAssembler::incrementw(Register reg, int value) 1836 { 1837 if (value < 0) { decrementw(reg, -value); return; } 1838 if (value == 0) { return; } 1839 if (value < (1 << 12)) { addw(reg, reg, value); return; } 1840 /* else */ { 1841 assert(reg != rscratch2, "invalid dst for register increment"); 1842 movw(rscratch2, (unsigned)value); 1843 addw(reg, reg, rscratch2); 1844 } 1845 } 1846 1847 void MacroAssembler::increment(Register reg, int value) 1848 { 1849 if (value < 0) { decrement(reg, -value); return; } 1850 if (value == 0) { return; } 1851 if (value < (1 << 12)) { add(reg, reg, value); return; } 1852 /* else */ { 1853 assert(reg != rscratch2, "invalid dst for register increment"); 1854 movw(rscratch2, (unsigned)value); 1855 add(reg, reg, rscratch2); 1856 } 1857 } 1858 1859 void MacroAssembler::incrementw(Address dst, int value) 1860 { 1861 assert(!dst.uses(rscratch1), "invalid dst for address increment"); 1862 ldrw(rscratch1, dst); 1863 incrementw(rscratch1, value); 1864 strw(rscratch1, dst); 1865 } 1866 1867 void MacroAssembler::increment(Address dst, int value) 1868 { 1869 assert(!dst.uses(rscratch1), "invalid dst for address increment"); 1870 ldr(rscratch1, dst); 1871 increment(rscratch1, value); 1872 str(rscratch1, dst); 1873 } 1874 1875 1876 void MacroAssembler::pusha() { 1877 push(0x7fffffff, sp); 1878 } 1879 1880 void MacroAssembler::popa() { 1881 pop(0x7fffffff, sp); 1882 } 1883 1884 // Push lots of registers in the bit set supplied. Don't push sp. 1885 // Return the number of words pushed 1886 int MacroAssembler::push(unsigned int bitset, Register stack) { 1887 int words_pushed = 0; 1888 1889 // Scan bitset to accumulate register pairs 1890 unsigned char regs[32]; 1891 int count = 0; 1892 for (int reg = 0; reg <= 30; reg++) { 1893 if (1 & bitset) 1894 regs[count++] = reg; 1895 bitset >>= 1; 1896 } 1897 regs[count++] = zr->encoding_nocheck(); 1898 count &= ~1; // Only push an even nuber of regs 1899 1900 if (count) { 1901 stp(as_Register(regs[0]), as_Register(regs[1]), 1902 Address(pre(stack, -count * wordSize))); 1903 words_pushed += 2; 1904 } 1905 for (int i = 2; i < count; i += 2) { 1906 stp(as_Register(regs[i]), as_Register(regs[i+1]), 1907 Address(stack, i * wordSize)); 1908 words_pushed += 2; 1909 } 1910 1911 assert(words_pushed == count, "oops, pushed != count"); 1912 1913 return count; 1914 } 1915 1916 int MacroAssembler::pop(unsigned int bitset, Register stack) { 1917 int words_pushed = 0; 1918 1919 // Scan bitset to accumulate register pairs 1920 unsigned char regs[32]; 1921 int count = 0; 1922 for (int reg = 0; reg <= 30; reg++) { 1923 if (1 & bitset) 1924 regs[count++] = reg; 1925 bitset >>= 1; 1926 } 1927 regs[count++] = zr->encoding_nocheck(); 1928 count &= ~1; 1929 1930 for (int i = 2; i < count; i += 2) { 1931 ldp(as_Register(regs[i]), as_Register(regs[i+1]), 1932 Address(stack, i * wordSize)); 1933 words_pushed += 2; 1934 } 1935 if (count) { 1936 ldp(as_Register(regs[0]), as_Register(regs[1]), 1937 Address(post(stack, count * wordSize))); 1938 words_pushed += 2; 1939 } 1940 1941 assert(words_pushed == count, "oops, pushed != count"); 1942 1943 return count; 1944 } 1945 #ifdef ASSERT 1946 void MacroAssembler::verify_heapbase(const char* msg) { 1947 #if 0 1948 assert (UseCompressedOops || UseCompressedClassPointers, "should be compressed"); 1949 assert (Universe::heap() != NULL, "java heap should be initialized"); 1950 if (CheckCompressedOops) { 1951 Label ok; 1952 push(1 << rscratch1->encoding(), sp); // cmpptr trashes rscratch1 1953 cmpptr(rheapbase, ExternalAddress((address)Universe::narrow_ptrs_base_addr())); 1954 br(Assembler::EQ, ok); 1955 stop(msg); 1956 bind(ok); 1957 pop(1 << rscratch1->encoding(), sp); 1958 } 1959 #endif 1960 } 1961 #endif 1962 1963 void MacroAssembler::stop(const char* msg) { 1964 address ip = pc(); 1965 pusha(); 1966 mov(c_rarg0, (address)msg); 1967 mov(c_rarg1, (address)ip); 1968 mov(c_rarg2, sp); 1969 mov(c_rarg3, CAST_FROM_FN_PTR(address, MacroAssembler::debug64)); 1970 // call(c_rarg3); 1971 blrt(c_rarg3, 3, 0, 1); 1972 hlt(0); 1973 } 1974 1975 // If a constant does not fit in an immediate field, generate some 1976 // number of MOV instructions and then perform the operation. 1977 void MacroAssembler::wrap_add_sub_imm_insn(Register Rd, Register Rn, unsigned imm, 1978 add_sub_imm_insn insn1, 1979 add_sub_reg_insn insn2) { 1980 assert(Rd != zr, "Rd = zr and not setting flags?"); 1981 if (operand_valid_for_add_sub_immediate((int)imm)) { 1982 (this->*insn1)(Rd, Rn, imm); 1983 } else { 1984 if (uabs(imm) < (1 << 24)) { 1985 (this->*insn1)(Rd, Rn, imm & -(1 << 12)); 1986 (this->*insn1)(Rd, Rd, imm & ((1 << 12)-1)); 1987 } else { 1988 assert_different_registers(Rd, Rn); 1989 mov(Rd, (uint64_t)imm); 1990 (this->*insn2)(Rd, Rn, Rd, LSL, 0); 1991 } 1992 } 1993 } 1994 1995 // Seperate vsn which sets the flags. Optimisations are more restricted 1996 // because we must set the flags correctly. 1997 void MacroAssembler::wrap_adds_subs_imm_insn(Register Rd, Register Rn, unsigned imm, 1998 add_sub_imm_insn insn1, 1999 add_sub_reg_insn insn2) { 2000 if (operand_valid_for_add_sub_immediate((int)imm)) { 2001 (this->*insn1)(Rd, Rn, imm); 2002 } else { 2003 assert_different_registers(Rd, Rn); 2004 assert(Rd != zr, "overflow in immediate operand"); 2005 mov(Rd, (uint64_t)imm); 2006 (this->*insn2)(Rd, Rn, Rd, LSL, 0); 2007 } 2008 } 2009 2010 2011 void MacroAssembler::add(Register Rd, Register Rn, RegisterOrConstant increment) { 2012 if (increment.is_register()) { 2013 add(Rd, Rn, increment.as_register()); 2014 } else { 2015 add(Rd, Rn, increment.as_constant()); 2016 } 2017 } 2018 2019 void MacroAssembler::addw(Register Rd, Register Rn, RegisterOrConstant increment) { 2020 if (increment.is_register()) { 2021 addw(Rd, Rn, increment.as_register()); 2022 } else { 2023 addw(Rd, Rn, increment.as_constant()); 2024 } 2025 } 2026 2027 void MacroAssembler::sub(Register Rd, Register Rn, RegisterOrConstant decrement) { 2028 if (decrement.is_register()) { 2029 sub(Rd, Rn, decrement.as_register()); 2030 } else { 2031 sub(Rd, Rn, decrement.as_constant()); 2032 } 2033 } 2034 2035 void MacroAssembler::subw(Register Rd, Register Rn, RegisterOrConstant decrement) { 2036 if (decrement.is_register()) { 2037 subw(Rd, Rn, decrement.as_register()); 2038 } else { 2039 subw(Rd, Rn, decrement.as_constant()); 2040 } 2041 } 2042 2043 void MacroAssembler::reinit_heapbase() 2044 { 2045 if (UseCompressedOops) { 2046 if (Universe::is_fully_initialized()) { 2047 mov(rheapbase, Universe::narrow_ptrs_base()); 2048 } else { 2049 lea(rheapbase, ExternalAddress((address)Universe::narrow_ptrs_base_addr())); 2050 ldr(rheapbase, Address(rheapbase)); 2051 } 2052 } 2053 } 2054 2055 // this simulates the behaviour of the x86 cmpxchg instruction using a 2056 // load linked/store conditional pair. we use the acquire/release 2057 // versions of these instructions so that we flush pending writes as 2058 // per Java semantics. 2059 2060 // n.b the x86 version assumes the old value to be compared against is 2061 // in rax and updates rax with the value located in memory if the 2062 // cmpxchg fails. we supply a register for the old value explicitly 2063 2064 // the aarch64 load linked/store conditional instructions do not 2065 // accept an offset. so, unlike x86, we must provide a plain register 2066 // to identify the memory word to be compared/exchanged rather than a 2067 // register+offset Address. 2068 2069 void MacroAssembler::cmpxchgptr(Register oldv, Register newv, Register addr, Register tmp, 2070 Label &succeed, Label *fail) { 2071 // oldv holds comparison value 2072 // newv holds value to write in exchange 2073 // addr identifies memory word to compare against/update 2074 // tmp returns 0/1 for success/failure 2075 Label retry_load, nope; 2076 2077 bind(retry_load); 2078 // flush and load exclusive from the memory location 2079 // and fail if it is not what we expect 2080 ldaxr(tmp, addr); 2081 cmp(tmp, oldv); 2082 br(Assembler::NE, nope); 2083 // if we store+flush with no intervening write tmp wil be zero 2084 stlxr(tmp, newv, addr); 2085 cbzw(tmp, succeed); 2086 // retry so we only ever return after a load fails to compare 2087 // ensures we don't return a stale value after a failed write. 2088 b(retry_load); 2089 // if the memory word differs we return it in oldv and signal a fail 2090 bind(nope); 2091 membar(AnyAny); 2092 mov(oldv, tmp); 2093 if (fail) 2094 b(*fail); 2095 } 2096 2097 void MacroAssembler::cmpxchgw(Register oldv, Register newv, Register addr, Register tmp, 2098 Label &succeed, Label *fail) { 2099 // oldv holds comparison value 2100 // newv holds value to write in exchange 2101 // addr identifies memory word to compare against/update 2102 // tmp returns 0/1 for success/failure 2103 Label retry_load, nope; 2104 2105 bind(retry_load); 2106 // flush and load exclusive from the memory location 2107 // and fail if it is not what we expect 2108 ldaxrw(tmp, addr); 2109 cmp(tmp, oldv); 2110 br(Assembler::NE, nope); 2111 // if we store+flush with no intervening write tmp wil be zero 2112 stlxrw(tmp, newv, addr); 2113 cbzw(tmp, succeed); 2114 // retry so we only ever return after a load fails to compare 2115 // ensures we don't return a stale value after a failed write. 2116 b(retry_load); 2117 // if the memory word differs we return it in oldv and signal a fail 2118 bind(nope); 2119 membar(AnyAny); 2120 mov(oldv, tmp); 2121 if (fail) 2122 b(*fail); 2123 } 2124 2125 static bool different(Register a, RegisterOrConstant b, Register c) { 2126 if (b.is_constant()) 2127 return a != c; 2128 else 2129 return a != b.as_register() && a != c && b.as_register() != c; 2130 } 2131 2132 #define ATOMIC_OP(LDXR, OP, IOP, STXR) \ 2133 void MacroAssembler::atomic_##OP(Register prev, RegisterOrConstant incr, Register addr) { \ 2134 Register result = rscratch2; \ 2135 if (prev->is_valid()) \ 2136 result = different(prev, incr, addr) ? prev : rscratch2; \ 2137 \ 2138 Label retry_load; \ 2139 bind(retry_load); \ 2140 LDXR(result, addr); \ 2141 OP(rscratch1, result, incr); \ 2142 STXR(rscratch2, rscratch1, addr); \ 2143 cbnzw(rscratch2, retry_load); \ 2144 if (prev->is_valid() && prev != result) { \ 2145 IOP(prev, rscratch1, incr); \ 2146 } \ 2147 } 2148 2149 ATOMIC_OP(ldxr, add, sub, stxr) 2150 ATOMIC_OP(ldxrw, addw, subw, stxrw) 2151 2152 #undef ATOMIC_OP 2153 2154 #define ATOMIC_XCHG(OP, LDXR, STXR) \ 2155 void MacroAssembler::atomic_##OP(Register prev, Register newv, Register addr) { \ 2156 Register result = rscratch2; \ 2157 if (prev->is_valid()) \ 2158 result = different(prev, newv, addr) ? prev : rscratch2; \ 2159 \ 2160 Label retry_load; \ 2161 bind(retry_load); \ 2162 LDXR(result, addr); \ 2163 STXR(rscratch1, newv, addr); \ 2164 cbnzw(rscratch1, retry_load); \ 2165 if (prev->is_valid() && prev != result) \ 2166 mov(prev, result); \ 2167 } 2168 2169 ATOMIC_XCHG(xchg, ldxr, stxr) 2170 ATOMIC_XCHG(xchgw, ldxrw, stxrw) 2171 2172 #undef ATOMIC_XCHG 2173 2174 void MacroAssembler::incr_allocated_bytes(Register thread, 2175 Register var_size_in_bytes, 2176 int con_size_in_bytes, 2177 Register t1) { 2178 if (!thread->is_valid()) { 2179 thread = rthread; 2180 } 2181 assert(t1->is_valid(), "need temp reg"); 2182 2183 ldr(t1, Address(thread, in_bytes(JavaThread::allocated_bytes_offset()))); 2184 if (var_size_in_bytes->is_valid()) { 2185 add(t1, t1, var_size_in_bytes); 2186 } else { 2187 add(t1, t1, con_size_in_bytes); 2188 } 2189 str(t1, Address(thread, in_bytes(JavaThread::allocated_bytes_offset()))); 2190 } 2191 2192 #ifndef PRODUCT 2193 extern "C" void findpc(intptr_t x); 2194 #endif 2195 2196 void MacroAssembler::debug64(char* msg, int64_t pc, int64_t regs[]) 2197 { 2198 // In order to get locks to work, we need to fake a in_VM state 2199 if (ShowMessageBoxOnError ) { 2200 JavaThread* thread = JavaThread::current(); 2201 JavaThreadState saved_state = thread->thread_state(); 2202 thread->set_thread_state(_thread_in_vm); 2203 #ifndef PRODUCT 2204 if (CountBytecodes || TraceBytecodes || StopInterpreterAt) { 2205 ttyLocker ttyl; 2206 BytecodeCounter::print(); 2207 } 2208 #endif 2209 if (os::message_box(msg, "Execution stopped, print registers?")) { 2210 ttyLocker ttyl; 2211 tty->print_cr(" pc = 0x%016lx", pc); 2212 #ifndef PRODUCT 2213 tty->cr(); 2214 findpc(pc); 2215 tty->cr(); 2216 #endif 2217 tty->print_cr(" r0 = 0x%016lx", regs[0]); 2218 tty->print_cr(" r1 = 0x%016lx", regs[1]); 2219 tty->print_cr(" r2 = 0x%016lx", regs[2]); 2220 tty->print_cr(" r3 = 0x%016lx", regs[3]); 2221 tty->print_cr(" r4 = 0x%016lx", regs[4]); 2222 tty->print_cr(" r5 = 0x%016lx", regs[5]); 2223 tty->print_cr(" r6 = 0x%016lx", regs[6]); 2224 tty->print_cr(" r7 = 0x%016lx", regs[7]); 2225 tty->print_cr(" r8 = 0x%016lx", regs[8]); 2226 tty->print_cr(" r9 = 0x%016lx", regs[9]); 2227 tty->print_cr("r10 = 0x%016lx", regs[10]); 2228 tty->print_cr("r11 = 0x%016lx", regs[11]); 2229 tty->print_cr("r12 = 0x%016lx", regs[12]); 2230 tty->print_cr("r13 = 0x%016lx", regs[13]); 2231 tty->print_cr("r14 = 0x%016lx", regs[14]); 2232 tty->print_cr("r15 = 0x%016lx", regs[15]); 2233 tty->print_cr("r16 = 0x%016lx", regs[16]); 2234 tty->print_cr("r17 = 0x%016lx", regs[17]); 2235 tty->print_cr("r18 = 0x%016lx", regs[18]); 2236 tty->print_cr("r19 = 0x%016lx", regs[19]); 2237 tty->print_cr("r20 = 0x%016lx", regs[20]); 2238 tty->print_cr("r21 = 0x%016lx", regs[21]); 2239 tty->print_cr("r22 = 0x%016lx", regs[22]); 2240 tty->print_cr("r23 = 0x%016lx", regs[23]); 2241 tty->print_cr("r24 = 0x%016lx", regs[24]); 2242 tty->print_cr("r25 = 0x%016lx", regs[25]); 2243 tty->print_cr("r26 = 0x%016lx", regs[26]); 2244 tty->print_cr("r27 = 0x%016lx", regs[27]); 2245 tty->print_cr("r28 = 0x%016lx", regs[28]); 2246 tty->print_cr("r30 = 0x%016lx", regs[30]); 2247 tty->print_cr("r31 = 0x%016lx", regs[31]); 2248 BREAKPOINT; 2249 } 2250 ThreadStateTransition::transition(thread, _thread_in_vm, saved_state); 2251 } else { 2252 ttyLocker ttyl; 2253 ::tty->print_cr("=============== DEBUG MESSAGE: %s ================\n", 2254 msg); 2255 assert(false, "DEBUG MESSAGE: %s", msg); 2256 } 2257 } 2258 2259 #ifdef BUILTIN_SIM 2260 // routine to generate an x86 prolog for a stub function which 2261 // bootstraps into the generated ARM code which directly follows the 2262 // stub 2263 // 2264 // the argument encodes the number of general and fp registers 2265 // passed by the caller and the callng convention (currently just 2266 // the number of general registers and assumes C argument passing) 2267 2268 extern "C" { 2269 int aarch64_stub_prolog_size(); 2270 void aarch64_stub_prolog(); 2271 void aarch64_prolog(); 2272 } 2273 2274 void MacroAssembler::c_stub_prolog(int gp_arg_count, int fp_arg_count, int ret_type, 2275 address *prolog_ptr) 2276 { 2277 int calltype = (((ret_type & 0x3) << 8) | 2278 ((fp_arg_count & 0xf) << 4) | 2279 (gp_arg_count & 0xf)); 2280 2281 // the addresses for the x86 to ARM entry code we need to use 2282 address start = pc(); 2283 // printf("start = %lx\n", start); 2284 int byteCount = aarch64_stub_prolog_size(); 2285 // printf("byteCount = %x\n", byteCount); 2286 int instructionCount = (byteCount + 3)/ 4; 2287 // printf("instructionCount = %x\n", instructionCount); 2288 for (int i = 0; i < instructionCount; i++) { 2289 nop(); 2290 } 2291 2292 memcpy(start, (void*)aarch64_stub_prolog, byteCount); 2293 2294 // write the address of the setup routine and the call format at the 2295 // end of into the copied code 2296 u_int64_t *patch_end = (u_int64_t *)(start + byteCount); 2297 if (prolog_ptr) 2298 patch_end[-2] = (u_int64_t)prolog_ptr; 2299 patch_end[-1] = calltype; 2300 } 2301 #endif 2302 2303 void MacroAssembler::push_CPU_state(bool save_vectors) { 2304 push(0x3fffffff, sp); // integer registers except lr & sp 2305 2306 if (!save_vectors) { 2307 for (int i = 30; i >= 0; i -= 2) 2308 stpd(as_FloatRegister(i), as_FloatRegister(i+1), 2309 Address(pre(sp, -2 * wordSize))); 2310 } else { 2311 for (int i = 30; i >= 0; i -= 2) 2312 stpq(as_FloatRegister(i), as_FloatRegister(i+1), 2313 Address(pre(sp, -4 * wordSize))); 2314 } 2315 } 2316 2317 void MacroAssembler::pop_CPU_state(bool restore_vectors) { 2318 if (!restore_vectors) { 2319 for (int i = 0; i < 32; i += 2) 2320 ldpd(as_FloatRegister(i), as_FloatRegister(i+1), 2321 Address(post(sp, 2 * wordSize))); 2322 } else { 2323 for (int i = 0; i < 32; i += 2) 2324 ldpq(as_FloatRegister(i), as_FloatRegister(i+1), 2325 Address(post(sp, 4 * wordSize))); 2326 } 2327 2328 pop(0x3fffffff, sp); // integer registers except lr & sp 2329 } 2330 2331 /** 2332 * Helpers for multiply_to_len(). 2333 */ 2334 void MacroAssembler::add2_with_carry(Register final_dest_hi, Register dest_hi, Register dest_lo, 2335 Register src1, Register src2) { 2336 adds(dest_lo, dest_lo, src1); 2337 adc(dest_hi, dest_hi, zr); 2338 adds(dest_lo, dest_lo, src2); 2339 adc(final_dest_hi, dest_hi, zr); 2340 } 2341 2342 // Generate an address from (r + r1 extend offset). "size" is the 2343 // size of the operand. The result may be in rscratch2. 2344 Address MacroAssembler::offsetted_address(Register r, Register r1, 2345 Address::extend ext, int offset, int size) { 2346 if (offset || (ext.shift() % size != 0)) { 2347 lea(rscratch2, Address(r, r1, ext)); 2348 return Address(rscratch2, offset); 2349 } else { 2350 return Address(r, r1, ext); 2351 } 2352 } 2353 2354 Address MacroAssembler::spill_address(int size, int offset, Register tmp) 2355 { 2356 assert(offset >= 0, "spill to negative address?"); 2357 // Offset reachable ? 2358 // Not aligned - 9 bits signed offset 2359 // Aligned - 12 bits unsigned offset shifted 2360 Register base = sp; 2361 if ((offset & (size-1)) && offset >= (1<<8)) { 2362 add(tmp, base, offset & ((1<<12)-1)); 2363 base = tmp; 2364 offset &= -1<<12; 2365 } 2366 2367 if (offset >= (1<<12) * size) { 2368 add(tmp, base, offset & (((1<<12)-1)<<12)); 2369 base = tmp; 2370 offset &= ~(((1<<12)-1)<<12); 2371 } 2372 2373 return Address(base, offset); 2374 } 2375 2376 /** 2377 * Multiply 64 bit by 64 bit first loop. 2378 */ 2379 void MacroAssembler::multiply_64_x_64_loop(Register x, Register xstart, Register x_xstart, 2380 Register y, Register y_idx, Register z, 2381 Register carry, Register product, 2382 Register idx, Register kdx) { 2383 // 2384 // jlong carry, x[], y[], z[]; 2385 // for (int idx=ystart, kdx=ystart+1+xstart; idx >= 0; idx-, kdx--) { 2386 // huge_128 product = y[idx] * x[xstart] + carry; 2387 // z[kdx] = (jlong)product; 2388 // carry = (jlong)(product >>> 64); 2389 // } 2390 // z[xstart] = carry; 2391 // 2392 2393 Label L_first_loop, L_first_loop_exit; 2394 Label L_one_x, L_one_y, L_multiply; 2395 2396 subsw(xstart, xstart, 1); 2397 br(Assembler::MI, L_one_x); 2398 2399 lea(rscratch1, Address(x, xstart, Address::lsl(LogBytesPerInt))); 2400 ldr(x_xstart, Address(rscratch1)); 2401 ror(x_xstart, x_xstart, 32); // convert big-endian to little-endian 2402 2403 bind(L_first_loop); 2404 subsw(idx, idx, 1); 2405 br(Assembler::MI, L_first_loop_exit); 2406 subsw(idx, idx, 1); 2407 br(Assembler::MI, L_one_y); 2408 lea(rscratch1, Address(y, idx, Address::uxtw(LogBytesPerInt))); 2409 ldr(y_idx, Address(rscratch1)); 2410 ror(y_idx, y_idx, 32); // convert big-endian to little-endian 2411 bind(L_multiply); 2412 2413 // AArch64 has a multiply-accumulate instruction that we can't use 2414 // here because it has no way to process carries, so we have to use 2415 // separate add and adc instructions. Bah. 2416 umulh(rscratch1, x_xstart, y_idx); // x_xstart * y_idx -> rscratch1:product 2417 mul(product, x_xstart, y_idx); 2418 adds(product, product, carry); 2419 adc(carry, rscratch1, zr); // x_xstart * y_idx + carry -> carry:product 2420 2421 subw(kdx, kdx, 2); 2422 ror(product, product, 32); // back to big-endian 2423 str(product, offsetted_address(z, kdx, Address::uxtw(LogBytesPerInt), 0, BytesPerLong)); 2424 2425 b(L_first_loop); 2426 2427 bind(L_one_y); 2428 ldrw(y_idx, Address(y, 0)); 2429 b(L_multiply); 2430 2431 bind(L_one_x); 2432 ldrw(x_xstart, Address(x, 0)); 2433 b(L_first_loop); 2434 2435 bind(L_first_loop_exit); 2436 } 2437 2438 /** 2439 * Multiply 128 bit by 128. Unrolled inner loop. 2440 * 2441 */ 2442 void MacroAssembler::multiply_128_x_128_loop(Register y, Register z, 2443 Register carry, Register carry2, 2444 Register idx, Register jdx, 2445 Register yz_idx1, Register yz_idx2, 2446 Register tmp, Register tmp3, Register tmp4, 2447 Register tmp6, Register product_hi) { 2448 2449 // jlong carry, x[], y[], z[]; 2450 // int kdx = ystart+1; 2451 // for (int idx=ystart-2; idx >= 0; idx -= 2) { // Third loop 2452 // huge_128 tmp3 = (y[idx+1] * product_hi) + z[kdx+idx+1] + carry; 2453 // jlong carry2 = (jlong)(tmp3 >>> 64); 2454 // huge_128 tmp4 = (y[idx] * product_hi) + z[kdx+idx] + carry2; 2455 // carry = (jlong)(tmp4 >>> 64); 2456 // z[kdx+idx+1] = (jlong)tmp3; 2457 // z[kdx+idx] = (jlong)tmp4; 2458 // } 2459 // idx += 2; 2460 // if (idx > 0) { 2461 // yz_idx1 = (y[idx] * product_hi) + z[kdx+idx] + carry; 2462 // z[kdx+idx] = (jlong)yz_idx1; 2463 // carry = (jlong)(yz_idx1 >>> 64); 2464 // } 2465 // 2466 2467 Label L_third_loop, L_third_loop_exit, L_post_third_loop_done; 2468 2469 lsrw(jdx, idx, 2); 2470 2471 bind(L_third_loop); 2472 2473 subsw(jdx, jdx, 1); 2474 br(Assembler::MI, L_third_loop_exit); 2475 subw(idx, idx, 4); 2476 2477 lea(rscratch1, Address(y, idx, Address::uxtw(LogBytesPerInt))); 2478 2479 ldp(yz_idx2, yz_idx1, Address(rscratch1, 0)); 2480 2481 lea(tmp6, Address(z, idx, Address::uxtw(LogBytesPerInt))); 2482 2483 ror(yz_idx1, yz_idx1, 32); // convert big-endian to little-endian 2484 ror(yz_idx2, yz_idx2, 32); 2485 2486 ldp(rscratch2, rscratch1, Address(tmp6, 0)); 2487 2488 mul(tmp3, product_hi, yz_idx1); // yz_idx1 * product_hi -> tmp4:tmp3 2489 umulh(tmp4, product_hi, yz_idx1); 2490 2491 ror(rscratch1, rscratch1, 32); // convert big-endian to little-endian 2492 ror(rscratch2, rscratch2, 32); 2493 2494 mul(tmp, product_hi, yz_idx2); // yz_idx2 * product_hi -> carry2:tmp 2495 umulh(carry2, product_hi, yz_idx2); 2496 2497 // propagate sum of both multiplications into carry:tmp4:tmp3 2498 adds(tmp3, tmp3, carry); 2499 adc(tmp4, tmp4, zr); 2500 adds(tmp3, tmp3, rscratch1); 2501 adcs(tmp4, tmp4, tmp); 2502 adc(carry, carry2, zr); 2503 adds(tmp4, tmp4, rscratch2); 2504 adc(carry, carry, zr); 2505 2506 ror(tmp3, tmp3, 32); // convert little-endian to big-endian 2507 ror(tmp4, tmp4, 32); 2508 stp(tmp4, tmp3, Address(tmp6, 0)); 2509 2510 b(L_third_loop); 2511 bind (L_third_loop_exit); 2512 2513 andw (idx, idx, 0x3); 2514 cbz(idx, L_post_third_loop_done); 2515 2516 Label L_check_1; 2517 subsw(idx, idx, 2); 2518 br(Assembler::MI, L_check_1); 2519 2520 lea(rscratch1, Address(y, idx, Address::uxtw(LogBytesPerInt))); 2521 ldr(yz_idx1, Address(rscratch1, 0)); 2522 ror(yz_idx1, yz_idx1, 32); 2523 mul(tmp3, product_hi, yz_idx1); // yz_idx1 * product_hi -> tmp4:tmp3 2524 umulh(tmp4, product_hi, yz_idx1); 2525 lea(rscratch1, Address(z, idx, Address::uxtw(LogBytesPerInt))); 2526 ldr(yz_idx2, Address(rscratch1, 0)); 2527 ror(yz_idx2, yz_idx2, 32); 2528 2529 add2_with_carry(carry, tmp4, tmp3, carry, yz_idx2); 2530 2531 ror(tmp3, tmp3, 32); 2532 str(tmp3, Address(rscratch1, 0)); 2533 2534 bind (L_check_1); 2535 2536 andw (idx, idx, 0x1); 2537 subsw(idx, idx, 1); 2538 br(Assembler::MI, L_post_third_loop_done); 2539 ldrw(tmp4, Address(y, idx, Address::uxtw(LogBytesPerInt))); 2540 mul(tmp3, tmp4, product_hi); // tmp4 * product_hi -> carry2:tmp3 2541 umulh(carry2, tmp4, product_hi); 2542 ldrw(tmp4, Address(z, idx, Address::uxtw(LogBytesPerInt))); 2543 2544 add2_with_carry(carry2, tmp3, tmp4, carry); 2545 2546 strw(tmp3, Address(z, idx, Address::uxtw(LogBytesPerInt))); 2547 extr(carry, carry2, tmp3, 32); 2548 2549 bind(L_post_third_loop_done); 2550 } 2551 2552 /** 2553 * Code for BigInteger::multiplyToLen() instrinsic. 2554 * 2555 * r0: x 2556 * r1: xlen 2557 * r2: y 2558 * r3: ylen 2559 * r4: z 2560 * r5: zlen 2561 * r10: tmp1 2562 * r11: tmp2 2563 * r12: tmp3 2564 * r13: tmp4 2565 * r14: tmp5 2566 * r15: tmp6 2567 * r16: tmp7 2568 * 2569 */ 2570 void MacroAssembler::multiply_to_len(Register x, Register xlen, Register y, Register ylen, 2571 Register z, Register zlen, 2572 Register tmp1, Register tmp2, Register tmp3, Register tmp4, 2573 Register tmp5, Register tmp6, Register product_hi) { 2574 2575 assert_different_registers(x, xlen, y, ylen, z, zlen, tmp1, tmp2, tmp3, tmp4, tmp5, tmp6); 2576 2577 const Register idx = tmp1; 2578 const Register kdx = tmp2; 2579 const Register xstart = tmp3; 2580 2581 const Register y_idx = tmp4; 2582 const Register carry = tmp5; 2583 const Register product = xlen; 2584 const Register x_xstart = zlen; // reuse register 2585 2586 // First Loop. 2587 // 2588 // final static long LONG_MASK = 0xffffffffL; 2589 // int xstart = xlen - 1; 2590 // int ystart = ylen - 1; 2591 // long carry = 0; 2592 // for (int idx=ystart, kdx=ystart+1+xstart; idx >= 0; idx-, kdx--) { 2593 // long product = (y[idx] & LONG_MASK) * (x[xstart] & LONG_MASK) + carry; 2594 // z[kdx] = (int)product; 2595 // carry = product >>> 32; 2596 // } 2597 // z[xstart] = (int)carry; 2598 // 2599 2600 movw(idx, ylen); // idx = ylen; 2601 movw(kdx, zlen); // kdx = xlen+ylen; 2602 mov(carry, zr); // carry = 0; 2603 2604 Label L_done; 2605 2606 movw(xstart, xlen); 2607 subsw(xstart, xstart, 1); 2608 br(Assembler::MI, L_done); 2609 2610 multiply_64_x_64_loop(x, xstart, x_xstart, y, y_idx, z, carry, product, idx, kdx); 2611 2612 Label L_second_loop; 2613 cbzw(kdx, L_second_loop); 2614 2615 Label L_carry; 2616 subw(kdx, kdx, 1); 2617 cbzw(kdx, L_carry); 2618 2619 strw(carry, Address(z, kdx, Address::uxtw(LogBytesPerInt))); 2620 lsr(carry, carry, 32); 2621 subw(kdx, kdx, 1); 2622 2623 bind(L_carry); 2624 strw(carry, Address(z, kdx, Address::uxtw(LogBytesPerInt))); 2625 2626 // Second and third (nested) loops. 2627 // 2628 // for (int i = xstart-1; i >= 0; i--) { // Second loop 2629 // carry = 0; 2630 // for (int jdx=ystart, k=ystart+1+i; jdx >= 0; jdx--, k--) { // Third loop 2631 // long product = (y[jdx] & LONG_MASK) * (x[i] & LONG_MASK) + 2632 // (z[k] & LONG_MASK) + carry; 2633 // z[k] = (int)product; 2634 // carry = product >>> 32; 2635 // } 2636 // z[i] = (int)carry; 2637 // } 2638 // 2639 // i = xlen, j = tmp1, k = tmp2, carry = tmp5, x[i] = product_hi 2640 2641 const Register jdx = tmp1; 2642 2643 bind(L_second_loop); 2644 mov(carry, zr); // carry = 0; 2645 movw(jdx, ylen); // j = ystart+1 2646 2647 subsw(xstart, xstart, 1); // i = xstart-1; 2648 br(Assembler::MI, L_done); 2649 2650 str(z, Address(pre(sp, -4 * wordSize))); 2651 2652 Label L_last_x; 2653 lea(z, offsetted_address(z, xstart, Address::uxtw(LogBytesPerInt), 4, BytesPerInt)); // z = z + k - j 2654 subsw(xstart, xstart, 1); // i = xstart-1; 2655 br(Assembler::MI, L_last_x); 2656 2657 lea(rscratch1, Address(x, xstart, Address::uxtw(LogBytesPerInt))); 2658 ldr(product_hi, Address(rscratch1)); 2659 ror(product_hi, product_hi, 32); // convert big-endian to little-endian 2660 2661 Label L_third_loop_prologue; 2662 bind(L_third_loop_prologue); 2663 2664 str(ylen, Address(sp, wordSize)); 2665 stp(x, xstart, Address(sp, 2 * wordSize)); 2666 multiply_128_x_128_loop(y, z, carry, x, jdx, ylen, product, 2667 tmp2, x_xstart, tmp3, tmp4, tmp6, product_hi); 2668 ldp(z, ylen, Address(post(sp, 2 * wordSize))); 2669 ldp(x, xlen, Address(post(sp, 2 * wordSize))); // copy old xstart -> xlen 2670 2671 addw(tmp3, xlen, 1); 2672 strw(carry, Address(z, tmp3, Address::uxtw(LogBytesPerInt))); 2673 subsw(tmp3, tmp3, 1); 2674 br(Assembler::MI, L_done); 2675 2676 lsr(carry, carry, 32); 2677 strw(carry, Address(z, tmp3, Address::uxtw(LogBytesPerInt))); 2678 b(L_second_loop); 2679 2680 // Next infrequent code is moved outside loops. 2681 bind(L_last_x); 2682 ldrw(product_hi, Address(x, 0)); 2683 b(L_third_loop_prologue); 2684 2685 bind(L_done); 2686 } 2687 2688 /** 2689 * Emits code to update CRC-32 with a byte value according to constants in table 2690 * 2691 * @param [in,out]crc Register containing the crc. 2692 * @param [in]val Register containing the byte to fold into the CRC. 2693 * @param [in]table Register containing the table of crc constants. 2694 * 2695 * uint32_t crc; 2696 * val = crc_table[(val ^ crc) & 0xFF]; 2697 * crc = val ^ (crc >> 8); 2698 * 2699 */ 2700 void MacroAssembler::update_byte_crc32(Register crc, Register val, Register table) { 2701 eor(val, val, crc); 2702 andr(val, val, 0xff); 2703 ldrw(val, Address(table, val, Address::lsl(2))); 2704 eor(crc, val, crc, Assembler::LSR, 8); 2705 } 2706 2707 /** 2708 * Emits code to update CRC-32 with a 32-bit value according to tables 0 to 3 2709 * 2710 * @param [in,out]crc Register containing the crc. 2711 * @param [in]v Register containing the 32-bit to fold into the CRC. 2712 * @param [in]table0 Register containing table 0 of crc constants. 2713 * @param [in]table1 Register containing table 1 of crc constants. 2714 * @param [in]table2 Register containing table 2 of crc constants. 2715 * @param [in]table3 Register containing table 3 of crc constants. 2716 * 2717 * uint32_t crc; 2718 * v = crc ^ v 2719 * crc = table3[v&0xff]^table2[(v>>8)&0xff]^table1[(v>>16)&0xff]^table0[v>>24] 2720 * 2721 */ 2722 void MacroAssembler::update_word_crc32(Register crc, Register v, Register tmp, 2723 Register table0, Register table1, Register table2, Register table3, 2724 bool upper) { 2725 eor(v, crc, v, upper ? LSR:LSL, upper ? 32:0); 2726 uxtb(tmp, v); 2727 ldrw(crc, Address(table3, tmp, Address::lsl(2))); 2728 ubfx(tmp, v, 8, 8); 2729 ldrw(tmp, Address(table2, tmp, Address::lsl(2))); 2730 eor(crc, crc, tmp); 2731 ubfx(tmp, v, 16, 8); 2732 ldrw(tmp, Address(table1, tmp, Address::lsl(2))); 2733 eor(crc, crc, tmp); 2734 ubfx(tmp, v, 24, 8); 2735 ldrw(tmp, Address(table0, tmp, Address::lsl(2))); 2736 eor(crc, crc, tmp); 2737 } 2738 2739 /** 2740 * @param crc register containing existing CRC (32-bit) 2741 * @param buf register pointing to input byte buffer (byte*) 2742 * @param len register containing number of bytes 2743 * @param table register that will contain address of CRC table 2744 * @param tmp scratch register 2745 */ 2746 void MacroAssembler::kernel_crc32(Register crc, Register buf, Register len, 2747 Register table0, Register table1, Register table2, Register table3, 2748 Register tmp, Register tmp2, Register tmp3) { 2749 Label L_by16, L_by16_loop, L_by4, L_by4_loop, L_by1, L_by1_loop, L_exit; 2750 unsigned long offset; 2751 2752 ornw(crc, zr, crc); 2753 2754 if (UseCRC32) { 2755 Label CRC_by64_loop, CRC_by4_loop, CRC_by1_loop; 2756 2757 subs(len, len, 64); 2758 br(Assembler::GE, CRC_by64_loop); 2759 adds(len, len, 64-4); 2760 br(Assembler::GE, CRC_by4_loop); 2761 adds(len, len, 4); 2762 br(Assembler::GT, CRC_by1_loop); 2763 b(L_exit); 2764 2765 BIND(CRC_by4_loop); 2766 ldrw(tmp, Address(post(buf, 4))); 2767 subs(len, len, 4); 2768 crc32w(crc, crc, tmp); 2769 br(Assembler::GE, CRC_by4_loop); 2770 adds(len, len, 4); 2771 br(Assembler::LE, L_exit); 2772 BIND(CRC_by1_loop); 2773 ldrb(tmp, Address(post(buf, 1))); 2774 subs(len, len, 1); 2775 crc32b(crc, crc, tmp); 2776 br(Assembler::GT, CRC_by1_loop); 2777 b(L_exit); 2778 2779 align(CodeEntryAlignment); 2780 BIND(CRC_by64_loop); 2781 subs(len, len, 64); 2782 ldp(tmp, tmp3, Address(post(buf, 16))); 2783 crc32x(crc, crc, tmp); 2784 crc32x(crc, crc, tmp3); 2785 ldp(tmp, tmp3, Address(post(buf, 16))); 2786 crc32x(crc, crc, tmp); 2787 crc32x(crc, crc, tmp3); 2788 ldp(tmp, tmp3, Address(post(buf, 16))); 2789 crc32x(crc, crc, tmp); 2790 crc32x(crc, crc, tmp3); 2791 ldp(tmp, tmp3, Address(post(buf, 16))); 2792 crc32x(crc, crc, tmp); 2793 crc32x(crc, crc, tmp3); 2794 br(Assembler::GE, CRC_by64_loop); 2795 adds(len, len, 64-4); 2796 br(Assembler::GE, CRC_by4_loop); 2797 adds(len, len, 4); 2798 br(Assembler::GT, CRC_by1_loop); 2799 BIND(L_exit); 2800 ornw(crc, zr, crc); 2801 return; 2802 } 2803 2804 adrp(table0, ExternalAddress(StubRoutines::crc_table_addr()), offset); 2805 if (offset) add(table0, table0, offset); 2806 add(table1, table0, 1*256*sizeof(juint)); 2807 add(table2, table0, 2*256*sizeof(juint)); 2808 add(table3, table0, 3*256*sizeof(juint)); 2809 2810 if (UseNeon) { 2811 cmp(len, 64); 2812 br(Assembler::LT, L_by16); 2813 eor(v16, T16B, v16, v16); 2814 2815 Label L_fold; 2816 2817 add(tmp, table0, 4*256*sizeof(juint)); // Point at the Neon constants 2818 2819 ld1(v0, v1, T2D, post(buf, 32)); 2820 ld1r(v4, T2D, post(tmp, 8)); 2821 ld1r(v5, T2D, post(tmp, 8)); 2822 ld1r(v6, T2D, post(tmp, 8)); 2823 ld1r(v7, T2D, post(tmp, 8)); 2824 mov(v16, T4S, 0, crc); 2825 2826 eor(v0, T16B, v0, v16); 2827 sub(len, len, 64); 2828 2829 BIND(L_fold); 2830 pmull(v22, T8H, v0, v5, T8B); 2831 pmull(v20, T8H, v0, v7, T8B); 2832 pmull(v23, T8H, v0, v4, T8B); 2833 pmull(v21, T8H, v0, v6, T8B); 2834 2835 pmull2(v18, T8H, v0, v5, T16B); 2836 pmull2(v16, T8H, v0, v7, T16B); 2837 pmull2(v19, T8H, v0, v4, T16B); 2838 pmull2(v17, T8H, v0, v6, T16B); 2839 2840 uzp1(v24, v20, v22, T8H); 2841 uzp2(v25, v20, v22, T8H); 2842 eor(v20, T16B, v24, v25); 2843 2844 uzp1(v26, v16, v18, T8H); 2845 uzp2(v27, v16, v18, T8H); 2846 eor(v16, T16B, v26, v27); 2847 2848 ushll2(v22, T4S, v20, T8H, 8); 2849 ushll(v20, T4S, v20, T4H, 8); 2850 2851 ushll2(v18, T4S, v16, T8H, 8); 2852 ushll(v16, T4S, v16, T4H, 8); 2853 2854 eor(v22, T16B, v23, v22); 2855 eor(v18, T16B, v19, v18); 2856 eor(v20, T16B, v21, v20); 2857 eor(v16, T16B, v17, v16); 2858 2859 uzp1(v17, v16, v20, T2D); 2860 uzp2(v21, v16, v20, T2D); 2861 eor(v17, T16B, v17, v21); 2862 2863 ushll2(v20, T2D, v17, T4S, 16); 2864 ushll(v16, T2D, v17, T2S, 16); 2865 2866 eor(v20, T16B, v20, v22); 2867 eor(v16, T16B, v16, v18); 2868 2869 uzp1(v17, v20, v16, T2D); 2870 uzp2(v21, v20, v16, T2D); 2871 eor(v28, T16B, v17, v21); 2872 2873 pmull(v22, T8H, v1, v5, T8B); 2874 pmull(v20, T8H, v1, v7, T8B); 2875 pmull(v23, T8H, v1, v4, T8B); 2876 pmull(v21, T8H, v1, v6, T8B); 2877 2878 pmull2(v18, T8H, v1, v5, T16B); 2879 pmull2(v16, T8H, v1, v7, T16B); 2880 pmull2(v19, T8H, v1, v4, T16B); 2881 pmull2(v17, T8H, v1, v6, T16B); 2882 2883 ld1(v0, v1, T2D, post(buf, 32)); 2884 2885 uzp1(v24, v20, v22, T8H); 2886 uzp2(v25, v20, v22, T8H); 2887 eor(v20, T16B, v24, v25); 2888 2889 uzp1(v26, v16, v18, T8H); 2890 uzp2(v27, v16, v18, T8H); 2891 eor(v16, T16B, v26, v27); 2892 2893 ushll2(v22, T4S, v20, T8H, 8); 2894 ushll(v20, T4S, v20, T4H, 8); 2895 2896 ushll2(v18, T4S, v16, T8H, 8); 2897 ushll(v16, T4S, v16, T4H, 8); 2898 2899 eor(v22, T16B, v23, v22); 2900 eor(v18, T16B, v19, v18); 2901 eor(v20, T16B, v21, v20); 2902 eor(v16, T16B, v17, v16); 2903 2904 uzp1(v17, v16, v20, T2D); 2905 uzp2(v21, v16, v20, T2D); 2906 eor(v16, T16B, v17, v21); 2907 2908 ushll2(v20, T2D, v16, T4S, 16); 2909 ushll(v16, T2D, v16, T2S, 16); 2910 2911 eor(v20, T16B, v22, v20); 2912 eor(v16, T16B, v16, v18); 2913 2914 uzp1(v17, v20, v16, T2D); 2915 uzp2(v21, v20, v16, T2D); 2916 eor(v20, T16B, v17, v21); 2917 2918 shl(v16, T2D, v28, 1); 2919 shl(v17, T2D, v20, 1); 2920 2921 eor(v0, T16B, v0, v16); 2922 eor(v1, T16B, v1, v17); 2923 2924 subs(len, len, 32); 2925 br(Assembler::GE, L_fold); 2926 2927 mov(crc, 0); 2928 mov(tmp, v0, T1D, 0); 2929 update_word_crc32(crc, tmp, tmp2, table0, table1, table2, table3, false); 2930 update_word_crc32(crc, tmp, tmp2, table0, table1, table2, table3, true); 2931 mov(tmp, v0, T1D, 1); 2932 update_word_crc32(crc, tmp, tmp2, table0, table1, table2, table3, false); 2933 update_word_crc32(crc, tmp, tmp2, table0, table1, table2, table3, true); 2934 mov(tmp, v1, T1D, 0); 2935 update_word_crc32(crc, tmp, tmp2, table0, table1, table2, table3, false); 2936 update_word_crc32(crc, tmp, tmp2, table0, table1, table2, table3, true); 2937 mov(tmp, v1, T1D, 1); 2938 update_word_crc32(crc, tmp, tmp2, table0, table1, table2, table3, false); 2939 update_word_crc32(crc, tmp, tmp2, table0, table1, table2, table3, true); 2940 2941 add(len, len, 32); 2942 } 2943 2944 BIND(L_by16); 2945 subs(len, len, 16); 2946 br(Assembler::GE, L_by16_loop); 2947 adds(len, len, 16-4); 2948 br(Assembler::GE, L_by4_loop); 2949 adds(len, len, 4); 2950 br(Assembler::GT, L_by1_loop); 2951 b(L_exit); 2952 2953 BIND(L_by4_loop); 2954 ldrw(tmp, Address(post(buf, 4))); 2955 update_word_crc32(crc, tmp, tmp2, table0, table1, table2, table3); 2956 subs(len, len, 4); 2957 br(Assembler::GE, L_by4_loop); 2958 adds(len, len, 4); 2959 br(Assembler::LE, L_exit); 2960 BIND(L_by1_loop); 2961 subs(len, len, 1); 2962 ldrb(tmp, Address(post(buf, 1))); 2963 update_byte_crc32(crc, tmp, table0); 2964 br(Assembler::GT, L_by1_loop); 2965 b(L_exit); 2966 2967 align(CodeEntryAlignment); 2968 BIND(L_by16_loop); 2969 subs(len, len, 16); 2970 ldp(tmp, tmp3, Address(post(buf, 16))); 2971 update_word_crc32(crc, tmp, tmp2, table0, table1, table2, table3, false); 2972 update_word_crc32(crc, tmp, tmp2, table0, table1, table2, table3, true); 2973 update_word_crc32(crc, tmp3, tmp2, table0, table1, table2, table3, false); 2974 update_word_crc32(crc, tmp3, tmp2, table0, table1, table2, table3, true); 2975 br(Assembler::GE, L_by16_loop); 2976 adds(len, len, 16-4); 2977 br(Assembler::GE, L_by4_loop); 2978 adds(len, len, 4); 2979 br(Assembler::GT, L_by1_loop); 2980 BIND(L_exit); 2981 ornw(crc, zr, crc); 2982 } 2983 2984 /** 2985 * @param crc register containing existing CRC (32-bit) 2986 * @param buf register pointing to input byte buffer (byte*) 2987 * @param len register containing number of bytes 2988 * @param table register that will contain address of CRC table 2989 * @param tmp scratch register 2990 */ 2991 void MacroAssembler::kernel_crc32c(Register crc, Register buf, Register len, 2992 Register table0, Register table1, Register table2, Register table3, 2993 Register tmp, Register tmp2, Register tmp3) { 2994 Label L_exit; 2995 Label CRC_by64_loop, CRC_by4_loop, CRC_by1_loop; 2996 2997 subs(len, len, 64); 2998 br(Assembler::GE, CRC_by64_loop); 2999 adds(len, len, 64-4); 3000 br(Assembler::GE, CRC_by4_loop); 3001 adds(len, len, 4); 3002 br(Assembler::GT, CRC_by1_loop); 3003 b(L_exit); 3004 3005 BIND(CRC_by4_loop); 3006 ldrw(tmp, Address(post(buf, 4))); 3007 subs(len, len, 4); 3008 crc32cw(crc, crc, tmp); 3009 br(Assembler::GE, CRC_by4_loop); 3010 adds(len, len, 4); 3011 br(Assembler::LE, L_exit); 3012 BIND(CRC_by1_loop); 3013 ldrb(tmp, Address(post(buf, 1))); 3014 subs(len, len, 1); 3015 crc32cb(crc, crc, tmp); 3016 br(Assembler::GT, CRC_by1_loop); 3017 b(L_exit); 3018 3019 align(CodeEntryAlignment); 3020 BIND(CRC_by64_loop); 3021 subs(len, len, 64); 3022 ldp(tmp, tmp3, Address(post(buf, 16))); 3023 crc32cx(crc, crc, tmp); 3024 crc32cx(crc, crc, tmp3); 3025 ldp(tmp, tmp3, Address(post(buf, 16))); 3026 crc32cx(crc, crc, tmp); 3027 crc32cx(crc, crc, tmp3); 3028 ldp(tmp, tmp3, Address(post(buf, 16))); 3029 crc32cx(crc, crc, tmp); 3030 crc32cx(crc, crc, tmp3); 3031 ldp(tmp, tmp3, Address(post(buf, 16))); 3032 crc32cx(crc, crc, tmp); 3033 crc32cx(crc, crc, tmp3); 3034 br(Assembler::GE, CRC_by64_loop); 3035 adds(len, len, 64-4); 3036 br(Assembler::GE, CRC_by4_loop); 3037 adds(len, len, 4); 3038 br(Assembler::GT, CRC_by1_loop); 3039 BIND(L_exit); 3040 return; 3041 } 3042 3043 SkipIfEqual::SkipIfEqual( 3044 MacroAssembler* masm, const bool* flag_addr, bool value) { 3045 _masm = masm; 3046 unsigned long offset; 3047 _masm->adrp(rscratch1, ExternalAddress((address)flag_addr), offset); 3048 _masm->ldrb(rscratch1, Address(rscratch1, offset)); 3049 _masm->cbzw(rscratch1, _label); 3050 } 3051 3052 SkipIfEqual::~SkipIfEqual() { 3053 _masm->bind(_label); 3054 } 3055 3056 void MacroAssembler::addptr(const Address &dst, int32_t src) { 3057 Address adr; 3058 switch(dst.getMode()) { 3059 case Address::base_plus_offset: 3060 // This is the expected mode, although we allow all the other 3061 // forms below. 3062 adr = form_address(rscratch2, dst.base(), dst.offset(), LogBytesPerWord); 3063 break; 3064 default: 3065 lea(rscratch2, dst); 3066 adr = Address(rscratch2); 3067 break; 3068 } 3069 ldr(rscratch1, adr); 3070 add(rscratch1, rscratch1, src); 3071 str(rscratch1, adr); 3072 } 3073 3074 void MacroAssembler::cmpptr(Register src1, Address src2) { 3075 unsigned long offset; 3076 adrp(rscratch1, src2, offset); 3077 ldr(rscratch1, Address(rscratch1, offset)); 3078 cmp(src1, rscratch1); 3079 } 3080 3081 void MacroAssembler::store_check(Register obj, Address dst) { 3082 store_check(obj); 3083 } 3084 3085 void MacroAssembler::store_check(Register obj) { 3086 // Does a store check for the oop in register obj. The content of 3087 // register obj is destroyed afterwards. 3088 3089 BarrierSet* bs = Universe::heap()->barrier_set(); 3090 assert(bs->kind() == BarrierSet::CardTableForRS || 3091 bs->kind() == BarrierSet::CardTableExtension, 3092 "Wrong barrier set kind"); 3093 3094 CardTableModRefBS* ct = barrier_set_cast<CardTableModRefBS>(bs); 3095 assert(sizeof(*ct->byte_map_base) == sizeof(jbyte), "adjust this code"); 3096 3097 lsr(obj, obj, CardTableModRefBS::card_shift); 3098 3099 assert(CardTableModRefBS::dirty_card_val() == 0, "must be"); 3100 3101 { 3102 ExternalAddress cardtable((address) ct->byte_map_base); 3103 unsigned long offset; 3104 adrp(rscratch1, cardtable, offset); 3105 assert(offset == 0, "byte_map_base is misaligned"); 3106 } 3107 3108 if (UseCondCardMark) { 3109 Label L_already_dirty; 3110 membar(StoreLoad); 3111 ldrb(rscratch2, Address(obj, rscratch1)); 3112 cbz(rscratch2, L_already_dirty); 3113 strb(zr, Address(obj, rscratch1)); 3114 bind(L_already_dirty); 3115 } else { 3116 if (UseConcMarkSweepGC && CMSPrecleaningEnabled) { 3117 membar(StoreStore); 3118 } 3119 strb(zr, Address(obj, rscratch1)); 3120 } 3121 } 3122 3123 void MacroAssembler::load_klass(Register dst, Register src) { 3124 if (UseCompressedClassPointers) { 3125 ldrw(dst, Address(src, oopDesc::klass_offset_in_bytes())); 3126 decode_klass_not_null(dst); 3127 } else { 3128 ldr(dst, Address(src, oopDesc::klass_offset_in_bytes())); 3129 } 3130 } 3131 3132 void MacroAssembler::cmp_klass(Register oop, Register trial_klass, Register tmp) { 3133 if (UseCompressedClassPointers) { 3134 ldrw(tmp, Address(oop, oopDesc::klass_offset_in_bytes())); 3135 if (Universe::narrow_klass_base() == NULL) { 3136 cmp(trial_klass, tmp, LSL, Universe::narrow_klass_shift()); 3137 return; 3138 } else if (((uint64_t)Universe::narrow_klass_base() & 0xffffffff) == 0 3139 && Universe::narrow_klass_shift() == 0) { 3140 // Only the bottom 32 bits matter 3141 cmpw(trial_klass, tmp); 3142 return; 3143 } 3144 decode_klass_not_null(tmp); 3145 } else { 3146 ldr(tmp, Address(oop, oopDesc::klass_offset_in_bytes())); 3147 } 3148 cmp(trial_klass, tmp); 3149 } 3150 3151 void MacroAssembler::load_prototype_header(Register dst, Register src) { 3152 load_klass(dst, src); 3153 ldr(dst, Address(dst, Klass::prototype_header_offset())); 3154 } 3155 3156 void MacroAssembler::store_klass(Register dst, Register src) { 3157 // FIXME: Should this be a store release? concurrent gcs assumes 3158 // klass length is valid if klass field is not null. 3159 if (UseCompressedClassPointers) { 3160 encode_klass_not_null(src); 3161 strw(src, Address(dst, oopDesc::klass_offset_in_bytes())); 3162 } else { 3163 str(src, Address(dst, oopDesc::klass_offset_in_bytes())); 3164 } 3165 } 3166 3167 void MacroAssembler::store_klass_gap(Register dst, Register src) { 3168 if (UseCompressedClassPointers) { 3169 // Store to klass gap in destination 3170 strw(src, Address(dst, oopDesc::klass_gap_offset_in_bytes())); 3171 } 3172 } 3173 3174 // Algorithm must match oop.inline.hpp encode_heap_oop. 3175 void MacroAssembler::encode_heap_oop(Register d, Register s) { 3176 #ifdef ASSERT 3177 verify_heapbase("MacroAssembler::encode_heap_oop: heap base corrupted?"); 3178 #endif 3179 verify_oop(s, "broken oop in encode_heap_oop"); 3180 if (Universe::narrow_oop_base() == NULL) { 3181 if (Universe::narrow_oop_shift() != 0) { 3182 assert (LogMinObjAlignmentInBytes == Universe::narrow_oop_shift(), "decode alg wrong"); 3183 lsr(d, s, LogMinObjAlignmentInBytes); 3184 } else { 3185 mov(d, s); 3186 } 3187 } else { 3188 subs(d, s, rheapbase); 3189 csel(d, d, zr, Assembler::HS); 3190 lsr(d, d, LogMinObjAlignmentInBytes); 3191 3192 /* Old algorithm: is this any worse? 3193 Label nonnull; 3194 cbnz(r, nonnull); 3195 sub(r, r, rheapbase); 3196 bind(nonnull); 3197 lsr(r, r, LogMinObjAlignmentInBytes); 3198 */ 3199 } 3200 } 3201 3202 void MacroAssembler::encode_heap_oop_not_null(Register r) { 3203 #ifdef ASSERT 3204 verify_heapbase("MacroAssembler::encode_heap_oop_not_null: heap base corrupted?"); 3205 if (CheckCompressedOops) { 3206 Label ok; 3207 cbnz(r, ok); 3208 stop("null oop passed to encode_heap_oop_not_null"); 3209 bind(ok); 3210 } 3211 #endif 3212 verify_oop(r, "broken oop in encode_heap_oop_not_null"); 3213 if (Universe::narrow_oop_base() != NULL) { 3214 sub(r, r, rheapbase); 3215 } 3216 if (Universe::narrow_oop_shift() != 0) { 3217 assert (LogMinObjAlignmentInBytes == Universe::narrow_oop_shift(), "decode alg wrong"); 3218 lsr(r, r, LogMinObjAlignmentInBytes); 3219 } 3220 } 3221 3222 void MacroAssembler::encode_heap_oop_not_null(Register dst, Register src) { 3223 #ifdef ASSERT 3224 verify_heapbase("MacroAssembler::encode_heap_oop_not_null2: heap base corrupted?"); 3225 if (CheckCompressedOops) { 3226 Label ok; 3227 cbnz(src, ok); 3228 stop("null oop passed to encode_heap_oop_not_null2"); 3229 bind(ok); 3230 } 3231 #endif 3232 verify_oop(src, "broken oop in encode_heap_oop_not_null2"); 3233 3234 Register data = src; 3235 if (Universe::narrow_oop_base() != NULL) { 3236 sub(dst, src, rheapbase); 3237 data = dst; 3238 } 3239 if (Universe::narrow_oop_shift() != 0) { 3240 assert (LogMinObjAlignmentInBytes == Universe::narrow_oop_shift(), "decode alg wrong"); 3241 lsr(dst, data, LogMinObjAlignmentInBytes); 3242 data = dst; 3243 } 3244 if (data == src) 3245 mov(dst, src); 3246 } 3247 3248 void MacroAssembler::decode_heap_oop(Register d, Register s) { 3249 #ifdef ASSERT 3250 verify_heapbase("MacroAssembler::decode_heap_oop: heap base corrupted?"); 3251 #endif 3252 if (Universe::narrow_oop_base() == NULL) { 3253 if (Universe::narrow_oop_shift() != 0 || d != s) { 3254 lsl(d, s, Universe::narrow_oop_shift()); 3255 } 3256 } else { 3257 Label done; 3258 if (d != s) 3259 mov(d, s); 3260 cbz(s, done); 3261 add(d, rheapbase, s, Assembler::LSL, LogMinObjAlignmentInBytes); 3262 bind(done); 3263 } 3264 verify_oop(d, "broken oop in decode_heap_oop"); 3265 } 3266 3267 void MacroAssembler::decode_heap_oop_not_null(Register r) { 3268 assert (UseCompressedOops, "should only be used for compressed headers"); 3269 assert (Universe::heap() != NULL, "java heap should be initialized"); 3270 // Cannot assert, unverified entry point counts instructions (see .ad file) 3271 // vtableStubs also counts instructions in pd_code_size_limit. 3272 // Also do not verify_oop as this is called by verify_oop. 3273 if (Universe::narrow_oop_shift() != 0) { 3274 assert(LogMinObjAlignmentInBytes == Universe::narrow_oop_shift(), "decode alg wrong"); 3275 if (Universe::narrow_oop_base() != NULL) { 3276 add(r, rheapbase, r, Assembler::LSL, LogMinObjAlignmentInBytes); 3277 } else { 3278 add(r, zr, r, Assembler::LSL, LogMinObjAlignmentInBytes); 3279 } 3280 } else { 3281 assert (Universe::narrow_oop_base() == NULL, "sanity"); 3282 } 3283 } 3284 3285 void MacroAssembler::decode_heap_oop_not_null(Register dst, Register src) { 3286 assert (UseCompressedOops, "should only be used for compressed headers"); 3287 assert (Universe::heap() != NULL, "java heap should be initialized"); 3288 // Cannot assert, unverified entry point counts instructions (see .ad file) 3289 // vtableStubs also counts instructions in pd_code_size_limit. 3290 // Also do not verify_oop as this is called by verify_oop. 3291 if (Universe::narrow_oop_shift() != 0) { 3292 assert(LogMinObjAlignmentInBytes == Universe::narrow_oop_shift(), "decode alg wrong"); 3293 if (Universe::narrow_oop_base() != NULL) { 3294 add(dst, rheapbase, src, Assembler::LSL, LogMinObjAlignmentInBytes); 3295 } else { 3296 add(dst, zr, src, Assembler::LSL, LogMinObjAlignmentInBytes); 3297 } 3298 } else { 3299 assert (Universe::narrow_oop_base() == NULL, "sanity"); 3300 if (dst != src) { 3301 mov(dst, src); 3302 } 3303 } 3304 } 3305 3306 void MacroAssembler::encode_klass_not_null(Register dst, Register src) { 3307 if (Universe::narrow_klass_base() == NULL) { 3308 if (Universe::narrow_klass_shift() != 0) { 3309 assert (LogKlassAlignmentInBytes == Universe::narrow_klass_shift(), "decode alg wrong"); 3310 lsr(dst, src, LogKlassAlignmentInBytes); 3311 } else { 3312 if (dst != src) mov(dst, src); 3313 } 3314 return; 3315 } 3316 3317 if (use_XOR_for_compressed_class_base) { 3318 if (Universe::narrow_klass_shift() != 0) { 3319 eor(dst, src, (uint64_t)Universe::narrow_klass_base()); 3320 lsr(dst, dst, LogKlassAlignmentInBytes); 3321 } else { 3322 eor(dst, src, (uint64_t)Universe::narrow_klass_base()); 3323 } 3324 return; 3325 } 3326 3327 if (((uint64_t)Universe::narrow_klass_base() & 0xffffffff) == 0 3328 && Universe::narrow_klass_shift() == 0) { 3329 movw(dst, src); 3330 return; 3331 } 3332 3333 #ifdef ASSERT 3334 verify_heapbase("MacroAssembler::encode_klass_not_null2: heap base corrupted?"); 3335 #endif 3336 3337 Register rbase = dst; 3338 if (dst == src) rbase = rheapbase; 3339 mov(rbase, (uint64_t)Universe::narrow_klass_base()); 3340 sub(dst, src, rbase); 3341 if (Universe::narrow_klass_shift() != 0) { 3342 assert (LogKlassAlignmentInBytes == Universe::narrow_klass_shift(), "decode alg wrong"); 3343 lsr(dst, dst, LogKlassAlignmentInBytes); 3344 } 3345 if (dst == src) reinit_heapbase(); 3346 } 3347 3348 void MacroAssembler::encode_klass_not_null(Register r) { 3349 encode_klass_not_null(r, r); 3350 } 3351 3352 void MacroAssembler::decode_klass_not_null(Register dst, Register src) { 3353 Register rbase = dst; 3354 assert (UseCompressedClassPointers, "should only be used for compressed headers"); 3355 3356 if (Universe::narrow_klass_base() == NULL) { 3357 if (Universe::narrow_klass_shift() != 0) { 3358 assert(LogKlassAlignmentInBytes == Universe::narrow_klass_shift(), "decode alg wrong"); 3359 lsl(dst, src, LogKlassAlignmentInBytes); 3360 } else { 3361 if (dst != src) mov(dst, src); 3362 } 3363 return; 3364 } 3365 3366 if (use_XOR_for_compressed_class_base) { 3367 if (Universe::narrow_klass_shift() != 0) { 3368 lsl(dst, src, LogKlassAlignmentInBytes); 3369 eor(dst, dst, (uint64_t)Universe::narrow_klass_base()); 3370 } else { 3371 eor(dst, src, (uint64_t)Universe::narrow_klass_base()); 3372 } 3373 return; 3374 } 3375 3376 if (((uint64_t)Universe::narrow_klass_base() & 0xffffffff) == 0 3377 && Universe::narrow_klass_shift() == 0) { 3378 if (dst != src) 3379 movw(dst, src); 3380 movk(dst, (uint64_t)Universe::narrow_klass_base() >> 32, 32); 3381 return; 3382 } 3383 3384 // Cannot assert, unverified entry point counts instructions (see .ad file) 3385 // vtableStubs also counts instructions in pd_code_size_limit. 3386 // Also do not verify_oop as this is called by verify_oop. 3387 if (dst == src) rbase = rheapbase; 3388 mov(rbase, (uint64_t)Universe::narrow_klass_base()); 3389 if (Universe::narrow_klass_shift() != 0) { 3390 assert(LogKlassAlignmentInBytes == Universe::narrow_klass_shift(), "decode alg wrong"); 3391 add(dst, rbase, src, Assembler::LSL, LogKlassAlignmentInBytes); 3392 } else { 3393 add(dst, rbase, src); 3394 } 3395 if (dst == src) reinit_heapbase(); 3396 } 3397 3398 void MacroAssembler::decode_klass_not_null(Register r) { 3399 decode_klass_not_null(r, r); 3400 } 3401 3402 void MacroAssembler::set_narrow_oop(Register dst, jobject obj) { 3403 assert (UseCompressedOops, "should only be used for compressed oops"); 3404 assert (Universe::heap() != NULL, "java heap should be initialized"); 3405 assert (oop_recorder() != NULL, "this assembler needs an OopRecorder"); 3406 3407 int oop_index = oop_recorder()->find_index(obj); 3408 assert(Universe::heap()->is_in_reserved(JNIHandles::resolve(obj)), "should be real oop"); 3409 3410 InstructionMark im(this); 3411 RelocationHolder rspec = oop_Relocation::spec(oop_index); 3412 code_section()->relocate(inst_mark(), rspec); 3413 movz(dst, 0xDEAD, 16); 3414 movk(dst, 0xBEEF); 3415 } 3416 3417 void MacroAssembler::set_narrow_klass(Register dst, Klass* k) { 3418 assert (UseCompressedClassPointers, "should only be used for compressed headers"); 3419 assert (oop_recorder() != NULL, "this assembler needs an OopRecorder"); 3420 int index = oop_recorder()->find_index(k); 3421 assert(! Universe::heap()->is_in_reserved(k), "should not be an oop"); 3422 3423 InstructionMark im(this); 3424 RelocationHolder rspec = metadata_Relocation::spec(index); 3425 code_section()->relocate(inst_mark(), rspec); 3426 narrowKlass nk = Klass::encode_klass(k); 3427 movz(dst, (nk >> 16), 16); 3428 movk(dst, nk & 0xffff); 3429 } 3430 3431 void MacroAssembler::load_heap_oop(Register dst, Address src) 3432 { 3433 if (UseCompressedOops) { 3434 ldrw(dst, src); 3435 decode_heap_oop(dst); 3436 } else { 3437 ldr(dst, src); 3438 } 3439 } 3440 3441 void MacroAssembler::load_heap_oop_not_null(Register dst, Address src) 3442 { 3443 if (UseCompressedOops) { 3444 ldrw(dst, src); 3445 decode_heap_oop_not_null(dst); 3446 } else { 3447 ldr(dst, src); 3448 } 3449 } 3450 3451 void MacroAssembler::store_heap_oop(Address dst, Register src) { 3452 if (UseCompressedOops) { 3453 assert(!dst.uses(src), "not enough registers"); 3454 encode_heap_oop(src); 3455 strw(src, dst); 3456 } else 3457 str(src, dst); 3458 } 3459 3460 // Used for storing NULLs. 3461 void MacroAssembler::store_heap_oop_null(Address dst) { 3462 if (UseCompressedOops) { 3463 strw(zr, dst); 3464 } else 3465 str(zr, dst); 3466 } 3467 3468 #if INCLUDE_ALL_GCS 3469 void MacroAssembler::g1_write_barrier_pre(Register obj, 3470 Register pre_val, 3471 Register thread, 3472 Register tmp, 3473 bool tosca_live, 3474 bool expand_call) { 3475 // If expand_call is true then we expand the call_VM_leaf macro 3476 // directly to skip generating the check by 3477 // InterpreterMacroAssembler::call_VM_leaf_base that checks _last_sp. 3478 3479 assert(thread == rthread, "must be"); 3480 3481 Label done; 3482 Label runtime; 3483 3484 assert(pre_val != noreg, "check this code"); 3485 3486 if (obj != noreg) 3487 assert_different_registers(obj, pre_val, tmp); 3488 3489 Address in_progress(thread, in_bytes(JavaThread::satb_mark_queue_offset() + 3490 PtrQueue::byte_offset_of_active())); 3491 Address index(thread, in_bytes(JavaThread::satb_mark_queue_offset() + 3492 PtrQueue::byte_offset_of_index())); 3493 Address buffer(thread, in_bytes(JavaThread::satb_mark_queue_offset() + 3494 PtrQueue::byte_offset_of_buf())); 3495 3496 3497 // Is marking active? 3498 if (in_bytes(PtrQueue::byte_width_of_active()) == 4) { 3499 ldrw(tmp, in_progress); 3500 } else { 3501 assert(in_bytes(PtrQueue::byte_width_of_active()) == 1, "Assumption"); 3502 ldrb(tmp, in_progress); 3503 } 3504 cbzw(tmp, done); 3505 3506 // Do we need to load the previous value? 3507 if (obj != noreg) { 3508 load_heap_oop(pre_val, Address(obj, 0)); 3509 } 3510 3511 // Is the previous value null? 3512 cbz(pre_val, done); 3513 3514 // Can we store original value in the thread's buffer? 3515 // Is index == 0? 3516 // (The index field is typed as size_t.) 3517 3518 ldr(tmp, index); // tmp := *index_adr 3519 cbz(tmp, runtime); // tmp == 0? 3520 // If yes, goto runtime 3521 3522 sub(tmp, tmp, wordSize); // tmp := tmp - wordSize 3523 str(tmp, index); // *index_adr := tmp 3524 ldr(rscratch1, buffer); 3525 add(tmp, tmp, rscratch1); // tmp := tmp + *buffer_adr 3526 3527 // Record the previous value 3528 str(pre_val, Address(tmp, 0)); 3529 b(done); 3530 3531 bind(runtime); 3532 // save the live input values 3533 push(r0->bit(tosca_live) | obj->bit(obj != noreg) | pre_val->bit(true), sp); 3534 3535 // Calling the runtime using the regular call_VM_leaf mechanism generates 3536 // code (generated by InterpreterMacroAssember::call_VM_leaf_base) 3537 // that checks that the *(rfp+frame::interpreter_frame_last_sp) == NULL. 3538 // 3539 // If we care generating the pre-barrier without a frame (e.g. in the 3540 // intrinsified Reference.get() routine) then ebp might be pointing to 3541 // the caller frame and so this check will most likely fail at runtime. 3542 // 3543 // Expanding the call directly bypasses the generation of the check. 3544 // So when we do not have have a full interpreter frame on the stack 3545 // expand_call should be passed true. 3546 3547 if (expand_call) { 3548 assert(pre_val != c_rarg1, "smashed arg"); 3549 pass_arg1(this, thread); 3550 pass_arg0(this, pre_val); 3551 MacroAssembler::call_VM_leaf_base(CAST_FROM_FN_PTR(address, SharedRuntime::g1_wb_pre), 2); 3552 } else { 3553 call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::g1_wb_pre), pre_val, thread); 3554 } 3555 3556 pop(r0->bit(tosca_live) | obj->bit(obj != noreg) | pre_val->bit(true), sp); 3557 3558 bind(done); 3559 } 3560 3561 void MacroAssembler::g1_write_barrier_post(Register store_addr, 3562 Register new_val, 3563 Register thread, 3564 Register tmp, 3565 Register tmp2) { 3566 assert(thread == rthread, "must be"); 3567 3568 Address queue_index(thread, in_bytes(JavaThread::dirty_card_queue_offset() + 3569 PtrQueue::byte_offset_of_index())); 3570 Address buffer(thread, in_bytes(JavaThread::dirty_card_queue_offset() + 3571 PtrQueue::byte_offset_of_buf())); 3572 3573 BarrierSet* bs = Universe::heap()->barrier_set(); 3574 CardTableModRefBS* ct = (CardTableModRefBS*)bs; 3575 assert(sizeof(*ct->byte_map_base) == sizeof(jbyte), "adjust this code"); 3576 3577 Label done; 3578 Label runtime; 3579 3580 // Does store cross heap regions? 3581 3582 eor(tmp, store_addr, new_val); 3583 lsr(tmp, tmp, HeapRegion::LogOfHRGrainBytes); 3584 cbz(tmp, done); 3585 3586 // crosses regions, storing NULL? 3587 3588 cbz(new_val, done); 3589 3590 // storing region crossing non-NULL, is card already dirty? 3591 3592 ExternalAddress cardtable((address) ct->byte_map_base); 3593 assert(sizeof(*ct->byte_map_base) == sizeof(jbyte), "adjust this code"); 3594 const Register card_addr = tmp; 3595 3596 lsr(card_addr, store_addr, CardTableModRefBS::card_shift); 3597 3598 unsigned long offset; 3599 adrp(tmp2, cardtable, offset); 3600 3601 // get the address of the card 3602 add(card_addr, card_addr, tmp2); 3603 ldrb(tmp2, Address(card_addr, offset)); 3604 cmpw(tmp2, (int)G1SATBCardTableModRefBS::g1_young_card_val()); 3605 br(Assembler::EQ, done); 3606 3607 assert((int)CardTableModRefBS::dirty_card_val() == 0, "must be 0"); 3608 3609 membar(Assembler::StoreLoad); 3610 3611 ldrb(tmp2, Address(card_addr, offset)); 3612 cbzw(tmp2, done); 3613 3614 // storing a region crossing, non-NULL oop, card is clean. 3615 // dirty card and log. 3616 3617 strb(zr, Address(card_addr, offset)); 3618 3619 ldr(rscratch1, queue_index); 3620 cbz(rscratch1, runtime); 3621 sub(rscratch1, rscratch1, wordSize); 3622 str(rscratch1, queue_index); 3623 3624 ldr(tmp2, buffer); 3625 str(card_addr, Address(tmp2, rscratch1)); 3626 b(done); 3627 3628 bind(runtime); 3629 // save the live input values 3630 push(store_addr->bit(true) | new_val->bit(true), sp); 3631 call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::g1_wb_post), card_addr, thread); 3632 pop(store_addr->bit(true) | new_val->bit(true), sp); 3633 3634 bind(done); 3635 } 3636 3637 #endif // INCLUDE_ALL_GCS 3638 3639 Address MacroAssembler::allocate_metadata_address(Metadata* obj) { 3640 assert(oop_recorder() != NULL, "this assembler needs a Recorder"); 3641 int index = oop_recorder()->allocate_metadata_index(obj); 3642 RelocationHolder rspec = metadata_Relocation::spec(index); 3643 return Address((address)obj, rspec); 3644 } 3645 3646 // Move an oop into a register. immediate is true if we want 3647 // immediate instrcutions, i.e. we are not going to patch this 3648 // instruction while the code is being executed by another thread. In 3649 // that case we can use move immediates rather than the constant pool. 3650 void MacroAssembler::movoop(Register dst, jobject obj, bool immediate) { 3651 int oop_index; 3652 if (obj == NULL) { 3653 oop_index = oop_recorder()->allocate_oop_index(obj); 3654 } else { 3655 oop_index = oop_recorder()->find_index(obj); 3656 assert(Universe::heap()->is_in_reserved(JNIHandles::resolve(obj)), "should be real oop"); 3657 } 3658 RelocationHolder rspec = oop_Relocation::spec(oop_index); 3659 if (! immediate) { 3660 address dummy = address(uintptr_t(pc()) & -wordSize); // A nearby aligned address 3661 ldr_constant(dst, Address(dummy, rspec)); 3662 } else 3663 mov(dst, Address((address)obj, rspec)); 3664 } 3665 3666 // Move a metadata address into a register. 3667 void MacroAssembler::mov_metadata(Register dst, Metadata* obj) { 3668 int oop_index; 3669 if (obj == NULL) { 3670 oop_index = oop_recorder()->allocate_metadata_index(obj); 3671 } else { 3672 oop_index = oop_recorder()->find_index(obj); 3673 } 3674 RelocationHolder rspec = metadata_Relocation::spec(oop_index); 3675 mov(dst, Address((address)obj, rspec)); 3676 } 3677 3678 Address MacroAssembler::constant_oop_address(jobject obj) { 3679 assert(oop_recorder() != NULL, "this assembler needs an OopRecorder"); 3680 assert(Universe::heap()->is_in_reserved(JNIHandles::resolve(obj)), "not an oop"); 3681 int oop_index = oop_recorder()->find_index(obj); 3682 return Address((address)obj, oop_Relocation::spec(oop_index)); 3683 } 3684 3685 // Defines obj, preserves var_size_in_bytes, okay for t2 == var_size_in_bytes. 3686 void MacroAssembler::tlab_allocate(Register obj, 3687 Register var_size_in_bytes, 3688 int con_size_in_bytes, 3689 Register t1, 3690 Register t2, 3691 Label& slow_case) { 3692 assert_different_registers(obj, t2); 3693 assert_different_registers(obj, var_size_in_bytes); 3694 Register end = t2; 3695 3696 // verify_tlab(); 3697 3698 ldr(obj, Address(rthread, JavaThread::tlab_top_offset())); 3699 if (var_size_in_bytes == noreg) { 3700 lea(end, Address(obj, con_size_in_bytes)); 3701 } else { 3702 lea(end, Address(obj, var_size_in_bytes)); 3703 } 3704 ldr(rscratch1, Address(rthread, JavaThread::tlab_end_offset())); 3705 cmp(end, rscratch1); 3706 br(Assembler::HI, slow_case); 3707 3708 // update the tlab top pointer 3709 str(end, Address(rthread, JavaThread::tlab_top_offset())); 3710 3711 // recover var_size_in_bytes if necessary 3712 if (var_size_in_bytes == end) { 3713 sub(var_size_in_bytes, var_size_in_bytes, obj); 3714 } 3715 // verify_tlab(); 3716 } 3717 3718 // Preserves r19, and r3. 3719 Register MacroAssembler::tlab_refill(Label& retry, 3720 Label& try_eden, 3721 Label& slow_case) { 3722 Register top = r0; 3723 Register t1 = r2; 3724 Register t2 = r4; 3725 assert_different_registers(top, rthread, t1, t2, /* preserve: */ r19, r3); 3726 Label do_refill, discard_tlab; 3727 3728 if (!Universe::heap()->supports_inline_contig_alloc()) { 3729 // No allocation in the shared eden. 3730 b(slow_case); 3731 } 3732 3733 ldr(top, Address(rthread, in_bytes(JavaThread::tlab_top_offset()))); 3734 ldr(t1, Address(rthread, in_bytes(JavaThread::tlab_end_offset()))); 3735 3736 // calculate amount of free space 3737 sub(t1, t1, top); 3738 lsr(t1, t1, LogHeapWordSize); 3739 3740 // Retain tlab and allocate object in shared space if 3741 // the amount free in the tlab is too large to discard. 3742 3743 ldr(rscratch1, Address(rthread, in_bytes(JavaThread::tlab_refill_waste_limit_offset()))); 3744 cmp(t1, rscratch1); 3745 br(Assembler::LE, discard_tlab); 3746 3747 // Retain 3748 // ldr(rscratch1, Address(rthread, in_bytes(JavaThread::tlab_refill_waste_limit_offset()))); 3749 mov(t2, (int32_t) ThreadLocalAllocBuffer::refill_waste_limit_increment()); 3750 add(rscratch1, rscratch1, t2); 3751 str(rscratch1, Address(rthread, in_bytes(JavaThread::tlab_refill_waste_limit_offset()))); 3752 3753 if (TLABStats) { 3754 // increment number of slow_allocations 3755 addmw(Address(rthread, in_bytes(JavaThread::tlab_slow_allocations_offset())), 3756 1, rscratch1); 3757 } 3758 b(try_eden); 3759 3760 bind(discard_tlab); 3761 if (TLABStats) { 3762 // increment number of refills 3763 addmw(Address(rthread, in_bytes(JavaThread::tlab_number_of_refills_offset())), 1, 3764 rscratch1); 3765 // accumulate wastage -- t1 is amount free in tlab 3766 addmw(Address(rthread, in_bytes(JavaThread::tlab_fast_refill_waste_offset())), t1, 3767 rscratch1); 3768 } 3769 3770 // if tlab is currently allocated (top or end != null) then 3771 // fill [top, end + alignment_reserve) with array object 3772 cbz(top, do_refill); 3773 3774 // set up the mark word 3775 mov(rscratch1, (intptr_t)markOopDesc::prototype()->copy_set_hash(0x2)); 3776 str(rscratch1, Address(top, oopDesc::mark_offset_in_bytes())); 3777 // set the length to the remaining space 3778 sub(t1, t1, typeArrayOopDesc::header_size(T_INT)); 3779 add(t1, t1, (int32_t)ThreadLocalAllocBuffer::alignment_reserve()); 3780 lsl(t1, t1, log2_intptr(HeapWordSize/sizeof(jint))); 3781 strw(t1, Address(top, arrayOopDesc::length_offset_in_bytes())); 3782 // set klass to intArrayKlass 3783 { 3784 unsigned long offset; 3785 // dubious reloc why not an oop reloc? 3786 adrp(rscratch1, ExternalAddress((address)Universe::intArrayKlassObj_addr()), 3787 offset); 3788 ldr(t1, Address(rscratch1, offset)); 3789 } 3790 // store klass last. concurrent gcs assumes klass length is valid if 3791 // klass field is not null. 3792 store_klass(top, t1); 3793 3794 mov(t1, top); 3795 ldr(rscratch1, Address(rthread, in_bytes(JavaThread::tlab_start_offset()))); 3796 sub(t1, t1, rscratch1); 3797 incr_allocated_bytes(rthread, t1, 0, rscratch1); 3798 3799 // refill the tlab with an eden allocation 3800 bind(do_refill); 3801 ldr(t1, Address(rthread, in_bytes(JavaThread::tlab_size_offset()))); 3802 lsl(t1, t1, LogHeapWordSize); 3803 // allocate new tlab, address returned in top 3804 eden_allocate(top, t1, 0, t2, slow_case); 3805 3806 // Check that t1 was preserved in eden_allocate. 3807 #ifdef ASSERT 3808 if (UseTLAB) { 3809 Label ok; 3810 Register tsize = r4; 3811 assert_different_registers(tsize, rthread, t1); 3812 str(tsize, Address(pre(sp, -16))); 3813 ldr(tsize, Address(rthread, in_bytes(JavaThread::tlab_size_offset()))); 3814 lsl(tsize, tsize, LogHeapWordSize); 3815 cmp(t1, tsize); 3816 br(Assembler::EQ, ok); 3817 STOP("assert(t1 != tlab size)"); 3818 should_not_reach_here(); 3819 3820 bind(ok); 3821 ldr(tsize, Address(post(sp, 16))); 3822 } 3823 #endif 3824 str(top, Address(rthread, in_bytes(JavaThread::tlab_start_offset()))); 3825 str(top, Address(rthread, in_bytes(JavaThread::tlab_top_offset()))); 3826 add(top, top, t1); 3827 sub(top, top, (int32_t)ThreadLocalAllocBuffer::alignment_reserve_in_bytes()); 3828 str(top, Address(rthread, in_bytes(JavaThread::tlab_end_offset()))); 3829 verify_tlab(); 3830 b(retry); 3831 3832 return rthread; // for use by caller 3833 } 3834 3835 // Defines obj, preserves var_size_in_bytes 3836 void MacroAssembler::eden_allocate(Register obj, 3837 Register var_size_in_bytes, 3838 int con_size_in_bytes, 3839 Register t1, 3840 Label& slow_case) { 3841 assert_different_registers(obj, var_size_in_bytes, t1); 3842 if (!Universe::heap()->supports_inline_contig_alloc()) { 3843 b(slow_case); 3844 } else { 3845 Register end = t1; 3846 Register heap_end = rscratch2; 3847 Label retry; 3848 bind(retry); 3849 { 3850 unsigned long offset; 3851 adrp(rscratch1, ExternalAddress((address) Universe::heap()->end_addr()), offset); 3852 ldr(heap_end, Address(rscratch1, offset)); 3853 } 3854 3855 ExternalAddress heap_top((address) Universe::heap()->top_addr()); 3856 3857 // Get the current top of the heap 3858 { 3859 unsigned long offset; 3860 adrp(rscratch1, heap_top, offset); 3861 // Use add() here after ARDP, rather than lea(). 3862 // lea() does not generate anything if its offset is zero. 3863 // However, relocs expect to find either an ADD or a load/store 3864 // insn after an ADRP. add() always generates an ADD insn, even 3865 // for add(Rn, Rn, 0). 3866 add(rscratch1, rscratch1, offset); 3867 ldaxr(obj, rscratch1); 3868 } 3869 3870 // Adjust it my the size of our new object 3871 if (var_size_in_bytes == noreg) { 3872 lea(end, Address(obj, con_size_in_bytes)); 3873 } else { 3874 lea(end, Address(obj, var_size_in_bytes)); 3875 } 3876 3877 // if end < obj then we wrapped around high memory 3878 cmp(end, obj); 3879 br(Assembler::LO, slow_case); 3880 3881 cmp(end, heap_end); 3882 br(Assembler::HI, slow_case); 3883 3884 // If heap_top hasn't been changed by some other thread, update it. 3885 stlxr(rscratch2, end, rscratch1); 3886 cbnzw(rscratch2, retry); 3887 } 3888 } 3889 3890 void MacroAssembler::verify_tlab() { 3891 #ifdef ASSERT 3892 if (UseTLAB && VerifyOops) { 3893 Label next, ok; 3894 3895 stp(rscratch2, rscratch1, Address(pre(sp, -16))); 3896 3897 ldr(rscratch2, Address(rthread, in_bytes(JavaThread::tlab_top_offset()))); 3898 ldr(rscratch1, Address(rthread, in_bytes(JavaThread::tlab_start_offset()))); 3899 cmp(rscratch2, rscratch1); 3900 br(Assembler::HS, next); 3901 STOP("assert(top >= start)"); 3902 should_not_reach_here(); 3903 3904 bind(next); 3905 ldr(rscratch2, Address(rthread, in_bytes(JavaThread::tlab_end_offset()))); 3906 ldr(rscratch1, Address(rthread, in_bytes(JavaThread::tlab_top_offset()))); 3907 cmp(rscratch2, rscratch1); 3908 br(Assembler::HS, ok); 3909 STOP("assert(top <= end)"); 3910 should_not_reach_here(); 3911 3912 bind(ok); 3913 ldp(rscratch2, rscratch1, Address(post(sp, 16))); 3914 } 3915 #endif 3916 } 3917 3918 // Writes to stack successive pages until offset reached to check for 3919 // stack overflow + shadow pages. This clobbers tmp. 3920 void MacroAssembler::bang_stack_size(Register size, Register tmp) { 3921 assert_different_registers(tmp, size, rscratch1); 3922 mov(tmp, sp); 3923 // Bang stack for total size given plus shadow page size. 3924 // Bang one page at a time because large size can bang beyond yellow and 3925 // red zones. 3926 Label loop; 3927 mov(rscratch1, os::vm_page_size()); 3928 bind(loop); 3929 lea(tmp, Address(tmp, -os::vm_page_size())); 3930 subsw(size, size, rscratch1); 3931 str(size, Address(tmp)); 3932 br(Assembler::GT, loop); 3933 3934 // Bang down shadow pages too. 3935 // At this point, (tmp-0) is the last address touched, so don't 3936 // touch it again. (It was touched as (tmp-pagesize) but then tmp 3937 // was post-decremented.) Skip this address by starting at i=1, and 3938 // touch a few more pages below. N.B. It is important to touch all 3939 // the way down to and including i=StackShadowPages. 3940 for (int i = 0; i< StackShadowPages-1; i++) { 3941 // this could be any sized move but this is can be a debugging crumb 3942 // so the bigger the better. 3943 lea(tmp, Address(tmp, -os::vm_page_size())); 3944 str(size, Address(tmp)); 3945 } 3946 } 3947 3948 3949 address MacroAssembler::read_polling_page(Register r, address page, relocInfo::relocType rtype) { 3950 unsigned long off; 3951 adrp(r, Address(page, rtype), off); 3952 InstructionMark im(this); 3953 code_section()->relocate(inst_mark(), rtype); 3954 ldrw(zr, Address(r, off)); 3955 return inst_mark(); 3956 } 3957 3958 address MacroAssembler::read_polling_page(Register r, relocInfo::relocType rtype) { 3959 InstructionMark im(this); 3960 code_section()->relocate(inst_mark(), rtype); 3961 ldrw(zr, Address(r, 0)); 3962 return inst_mark(); 3963 } 3964 3965 void MacroAssembler::adrp(Register reg1, const Address &dest, unsigned long &byte_offset) { 3966 relocInfo::relocType rtype = dest.rspec().reloc()->type(); 3967 if (uabs(pc() - dest.target()) >= (1LL << 32)) { 3968 guarantee(rtype == relocInfo::none 3969 || rtype == relocInfo::external_word_type 3970 || rtype == relocInfo::poll_type 3971 || rtype == relocInfo::poll_return_type, 3972 "can only use a fixed address with an ADRP"); 3973 // Out of range. This doesn't happen very often, but we have to 3974 // handle it 3975 mov(reg1, dest); 3976 byte_offset = 0; 3977 } else { 3978 InstructionMark im(this); 3979 code_section()->relocate(inst_mark(), dest.rspec()); 3980 byte_offset = (uint64_t)dest.target() & 0xfff; 3981 _adrp(reg1, dest.target()); 3982 } 3983 } 3984 3985 void MacroAssembler::build_frame(int framesize) { 3986 assert(framesize > 0, "framesize must be > 0"); 3987 if (framesize < ((1 << 9) + 2 * wordSize)) { 3988 sub(sp, sp, framesize); 3989 stp(rfp, lr, Address(sp, framesize - 2 * wordSize)); 3990 if (PreserveFramePointer) add(rfp, sp, framesize - 2 * wordSize); 3991 } else { 3992 stp(rfp, lr, Address(pre(sp, -2 * wordSize))); 3993 if (PreserveFramePointer) mov(rfp, sp); 3994 if (framesize < ((1 << 12) + 2 * wordSize)) 3995 sub(sp, sp, framesize - 2 * wordSize); 3996 else { 3997 mov(rscratch1, framesize - 2 * wordSize); 3998 sub(sp, sp, rscratch1); 3999 } 4000 } 4001 } 4002 4003 void MacroAssembler::remove_frame(int framesize) { 4004 assert(framesize > 0, "framesize must be > 0"); 4005 if (framesize < ((1 << 9) + 2 * wordSize)) { 4006 ldp(rfp, lr, Address(sp, framesize - 2 * wordSize)); 4007 add(sp, sp, framesize); 4008 } else { 4009 if (framesize < ((1 << 12) + 2 * wordSize)) 4010 add(sp, sp, framesize - 2 * wordSize); 4011 else { 4012 mov(rscratch1, framesize - 2 * wordSize); 4013 add(sp, sp, rscratch1); 4014 } 4015 ldp(rfp, lr, Address(post(sp, 2 * wordSize))); 4016 } 4017 } 4018 4019 4020 // Search for str1 in str2 and return index or -1 4021 void MacroAssembler::string_indexof(Register str2, Register str1, 4022 Register cnt2, Register cnt1, 4023 Register tmp1, Register tmp2, 4024 Register tmp3, Register tmp4, 4025 int icnt1, Register result) { 4026 Label BM, LINEARSEARCH, DONE, NOMATCH, MATCH; 4027 4028 Register ch1 = rscratch1; 4029 Register ch2 = rscratch2; 4030 Register cnt1tmp = tmp1; 4031 Register cnt2tmp = tmp2; 4032 Register cnt1_neg = cnt1; 4033 Register cnt2_neg = cnt2; 4034 Register result_tmp = tmp4; 4035 4036 // Note, inline_string_indexOf() generates checks: 4037 // if (substr.count > string.count) return -1; 4038 // if (substr.count == 0) return 0; 4039 4040 // We have two strings, a source string in str2, cnt2 and a pattern string 4041 // in str1, cnt1. Find the 1st occurence of pattern in source or return -1. 4042 4043 // For larger pattern and source we use a simplified Boyer Moore algorithm. 4044 // With a small pattern and source we use linear scan. 4045 4046 if (icnt1 == -1) { 4047 cmp(cnt1, 256); // Use Linear Scan if cnt1 < 8 || cnt1 >= 256 4048 ccmp(cnt1, 8, 0b0000, LO); // Can't handle skip >= 256 because we use 4049 br(LO, LINEARSEARCH); // a byte array. 4050 cmp(cnt1, cnt2, LSR, 2); // Source must be 4 * pattern for BM 4051 br(HS, LINEARSEARCH); 4052 } 4053 4054 // The Boyer Moore alogorithm is based on the description here:- 4055 // 4056 // http://en.wikipedia.org/wiki/Boyer%E2%80%93Moore_string_search_algorithm 4057 // 4058 // This describes and algorithm with 2 shift rules. The 'Bad Character' rule 4059 // and the 'Good Suffix' rule. 4060 // 4061 // These rules are essentially heuristics for how far we can shift the 4062 // pattern along the search string. 4063 // 4064 // The implementation here uses the 'Bad Character' rule only because of the 4065 // complexity of initialisation for the 'Good Suffix' rule. 4066 // 4067 // This is also known as the Boyer-Moore-Horspool algorithm:- 4068 // 4069 // http://en.wikipedia.org/wiki/Boyer-Moore-Horspool_algorithm 4070 // 4071 // #define ASIZE 128 4072 // 4073 // int bm(unsigned char *x, int m, unsigned char *y, int n) { 4074 // int i, j; 4075 // unsigned c; 4076 // unsigned char bc[ASIZE]; 4077 // 4078 // /* Preprocessing */ 4079 // for (i = 0; i < ASIZE; ++i) 4080 // bc[i] = 0; 4081 // for (i = 0; i < m - 1; ) { 4082 // c = x[i]; 4083 // ++i; 4084 // if (c < ASIZE) bc[c] = i; 4085 // } 4086 // 4087 // /* Searching */ 4088 // j = 0; 4089 // while (j <= n - m) { 4090 // c = y[i+j]; 4091 // if (x[m-1] == c) 4092 // for (i = m - 2; i >= 0 && x[i] == y[i + j]; --i); 4093 // if (i < 0) return j; 4094 // if (c < ASIZE) 4095 // j = j - bc[y[j+m-1]] + m; 4096 // else 4097 // j += 1; // Advance by 1 only if char >= ASIZE 4098 // } 4099 // } 4100 4101 if (icnt1 == -1) { 4102 BIND(BM); 4103 4104 Label ZLOOP, BCLOOP, BCSKIP, BMLOOPSTR2, BMLOOPSTR1, BMSKIP; 4105 Label BMADV, BMMATCH, BMCHECKEND; 4106 4107 Register cnt1end = tmp2; 4108 Register str2end = cnt2; 4109 Register skipch = tmp2; 4110 4111 // Restrict ASIZE to 128 to reduce stack space/initialisation. 4112 // The presence of chars >= ASIZE in the target string does not affect 4113 // performance, but we must be careful not to initialise them in the stack 4114 // array. 4115 // The presence of chars >= ASIZE in the source string may adversely affect 4116 // performance since we can only advance by one when we encounter one. 4117 4118 stp(zr, zr, pre(sp, -128)); 4119 for (int i = 1; i < 8; i++) 4120 stp(zr, zr, Address(sp, i*16)); 4121 4122 mov(cnt1tmp, 0); 4123 sub(cnt1end, cnt1, 1); 4124 BIND(BCLOOP); 4125 ldrh(ch1, Address(str1, cnt1tmp, Address::lsl(1))); 4126 cmp(ch1, 128); 4127 add(cnt1tmp, cnt1tmp, 1); 4128 br(HS, BCSKIP); 4129 strb(cnt1tmp, Address(sp, ch1)); 4130 BIND(BCSKIP); 4131 cmp(cnt1tmp, cnt1end); 4132 br(LT, BCLOOP); 4133 4134 mov(result_tmp, str2); 4135 4136 sub(cnt2, cnt2, cnt1); 4137 add(str2end, str2, cnt2, LSL, 1); 4138 BIND(BMLOOPSTR2); 4139 sub(cnt1tmp, cnt1, 1); 4140 ldrh(ch1, Address(str1, cnt1tmp, Address::lsl(1))); 4141 ldrh(skipch, Address(str2, cnt1tmp, Address::lsl(1))); 4142 cmp(ch1, skipch); 4143 br(NE, BMSKIP); 4144 subs(cnt1tmp, cnt1tmp, 1); 4145 br(LT, BMMATCH); 4146 BIND(BMLOOPSTR1); 4147 ldrh(ch1, Address(str1, cnt1tmp, Address::lsl(1))); 4148 ldrh(ch2, Address(str2, cnt1tmp, Address::lsl(1))); 4149 cmp(ch1, ch2); 4150 br(NE, BMSKIP); 4151 subs(cnt1tmp, cnt1tmp, 1); 4152 br(GE, BMLOOPSTR1); 4153 BIND(BMMATCH); 4154 sub(result_tmp, str2, result_tmp); 4155 lsr(result, result_tmp, 1); 4156 add(sp, sp, 128); 4157 b(DONE); 4158 BIND(BMADV); 4159 add(str2, str2, 2); 4160 b(BMCHECKEND); 4161 BIND(BMSKIP); 4162 cmp(skipch, 128); 4163 br(HS, BMADV); 4164 ldrb(ch2, Address(sp, skipch)); 4165 add(str2, str2, cnt1, LSL, 1); 4166 sub(str2, str2, ch2, LSL, 1); 4167 BIND(BMCHECKEND); 4168 cmp(str2, str2end); 4169 br(LE, BMLOOPSTR2); 4170 add(sp, sp, 128); 4171 b(NOMATCH); 4172 } 4173 4174 BIND(LINEARSEARCH); 4175 { 4176 Label DO1, DO2, DO3; 4177 4178 Register str2tmp = tmp2; 4179 Register first = tmp3; 4180 4181 if (icnt1 == -1) 4182 { 4183 Label DOSHORT, FIRST_LOOP, STR2_NEXT, STR1_LOOP, STR1_NEXT, LAST_WORD; 4184 4185 cmp(cnt1, 4); 4186 br(LT, DOSHORT); 4187 4188 sub(cnt2, cnt2, cnt1); 4189 sub(cnt1, cnt1, 4); 4190 mov(result_tmp, cnt2); 4191 4192 lea(str1, Address(str1, cnt1, Address::uxtw(1))); 4193 lea(str2, Address(str2, cnt2, Address::uxtw(1))); 4194 sub(cnt1_neg, zr, cnt1, LSL, 1); 4195 sub(cnt2_neg, zr, cnt2, LSL, 1); 4196 ldr(first, Address(str1, cnt1_neg)); 4197 4198 BIND(FIRST_LOOP); 4199 ldr(ch2, Address(str2, cnt2_neg)); 4200 cmp(first, ch2); 4201 br(EQ, STR1_LOOP); 4202 BIND(STR2_NEXT); 4203 adds(cnt2_neg, cnt2_neg, 2); 4204 br(LE, FIRST_LOOP); 4205 b(NOMATCH); 4206 4207 BIND(STR1_LOOP); 4208 adds(cnt1tmp, cnt1_neg, 8); 4209 add(cnt2tmp, cnt2_neg, 8); 4210 br(GE, LAST_WORD); 4211 4212 BIND(STR1_NEXT); 4213 ldr(ch1, Address(str1, cnt1tmp)); 4214 ldr(ch2, Address(str2, cnt2tmp)); 4215 cmp(ch1, ch2); 4216 br(NE, STR2_NEXT); 4217 adds(cnt1tmp, cnt1tmp, 8); 4218 add(cnt2tmp, cnt2tmp, 8); 4219 br(LT, STR1_NEXT); 4220 4221 BIND(LAST_WORD); 4222 ldr(ch1, Address(str1)); 4223 sub(str2tmp, str2, cnt1_neg); // adjust to corresponding 4224 ldr(ch2, Address(str2tmp, cnt2_neg)); // word in str2 4225 cmp(ch1, ch2); 4226 br(NE, STR2_NEXT); 4227 b(MATCH); 4228 4229 BIND(DOSHORT); 4230 cmp(cnt1, 2); 4231 br(LT, DO1); 4232 br(GT, DO3); 4233 } 4234 4235 if (icnt1 == 4) { 4236 Label CH1_LOOP; 4237 4238 ldr(ch1, str1); 4239 sub(cnt2, cnt2, 4); 4240 mov(result_tmp, cnt2); 4241 lea(str2, Address(str2, cnt2, Address::uxtw(1))); 4242 sub(cnt2_neg, zr, cnt2, LSL, 1); 4243 4244 BIND(CH1_LOOP); 4245 ldr(ch2, Address(str2, cnt2_neg)); 4246 cmp(ch1, ch2); 4247 br(EQ, MATCH); 4248 adds(cnt2_neg, cnt2_neg, 2); 4249 br(LE, CH1_LOOP); 4250 b(NOMATCH); 4251 } 4252 4253 if (icnt1 == -1 || icnt1 == 2) { 4254 Label CH1_LOOP; 4255 4256 BIND(DO2); 4257 ldrw(ch1, str1); 4258 sub(cnt2, cnt2, 2); 4259 mov(result_tmp, cnt2); 4260 lea(str2, Address(str2, cnt2, Address::uxtw(1))); 4261 sub(cnt2_neg, zr, cnt2, LSL, 1); 4262 4263 BIND(CH1_LOOP); 4264 ldrw(ch2, Address(str2, cnt2_neg)); 4265 cmp(ch1, ch2); 4266 br(EQ, MATCH); 4267 adds(cnt2_neg, cnt2_neg, 2); 4268 br(LE, CH1_LOOP); 4269 b(NOMATCH); 4270 } 4271 4272 if (icnt1 == -1 || icnt1 == 3) { 4273 Label FIRST_LOOP, STR2_NEXT, STR1_LOOP; 4274 4275 BIND(DO3); 4276 ldrw(first, str1); 4277 ldrh(ch1, Address(str1, 4)); 4278 4279 sub(cnt2, cnt2, 3); 4280 mov(result_tmp, cnt2); 4281 lea(str2, Address(str2, cnt2, Address::uxtw(1))); 4282 sub(cnt2_neg, zr, cnt2, LSL, 1); 4283 4284 BIND(FIRST_LOOP); 4285 ldrw(ch2, Address(str2, cnt2_neg)); 4286 cmpw(first, ch2); 4287 br(EQ, STR1_LOOP); 4288 BIND(STR2_NEXT); 4289 adds(cnt2_neg, cnt2_neg, 2); 4290 br(LE, FIRST_LOOP); 4291 b(NOMATCH); 4292 4293 BIND(STR1_LOOP); 4294 add(cnt2tmp, cnt2_neg, 4); 4295 ldrh(ch2, Address(str2, cnt2tmp)); 4296 cmp(ch1, ch2); 4297 br(NE, STR2_NEXT); 4298 b(MATCH); 4299 } 4300 4301 if (icnt1 == -1 || icnt1 == 1) { 4302 Label CH1_LOOP, HAS_ZERO; 4303 Label DO1_SHORT, DO1_LOOP; 4304 4305 BIND(DO1); 4306 ldrh(ch1, str1); 4307 cmp(cnt2, 4); 4308 br(LT, DO1_SHORT); 4309 4310 orr(ch1, ch1, ch1, LSL, 16); 4311 orr(ch1, ch1, ch1, LSL, 32); 4312 4313 sub(cnt2, cnt2, 4); 4314 mov(result_tmp, cnt2); 4315 lea(str2, Address(str2, cnt2, Address::uxtw(1))); 4316 sub(cnt2_neg, zr, cnt2, LSL, 1); 4317 4318 mov(tmp3, 0x0001000100010001); 4319 BIND(CH1_LOOP); 4320 ldr(ch2, Address(str2, cnt2_neg)); 4321 eor(ch2, ch1, ch2); 4322 sub(tmp1, ch2, tmp3); 4323 orr(tmp2, ch2, 0x7fff7fff7fff7fff); 4324 bics(tmp1, tmp1, tmp2); 4325 br(NE, HAS_ZERO); 4326 adds(cnt2_neg, cnt2_neg, 8); 4327 br(LT, CH1_LOOP); 4328 4329 cmp(cnt2_neg, 8); 4330 mov(cnt2_neg, 0); 4331 br(LT, CH1_LOOP); 4332 b(NOMATCH); 4333 4334 BIND(HAS_ZERO); 4335 rev(tmp1, tmp1); 4336 clz(tmp1, tmp1); 4337 add(cnt2_neg, cnt2_neg, tmp1, LSR, 3); 4338 b(MATCH); 4339 4340 BIND(DO1_SHORT); 4341 mov(result_tmp, cnt2); 4342 lea(str2, Address(str2, cnt2, Address::uxtw(1))); 4343 sub(cnt2_neg, zr, cnt2, LSL, 1); 4344 BIND(DO1_LOOP); 4345 ldrh(ch2, Address(str2, cnt2_neg)); 4346 cmpw(ch1, ch2); 4347 br(EQ, MATCH); 4348 adds(cnt2_neg, cnt2_neg, 2); 4349 br(LT, DO1_LOOP); 4350 } 4351 } 4352 BIND(NOMATCH); 4353 mov(result, -1); 4354 b(DONE); 4355 BIND(MATCH); 4356 add(result, result_tmp, cnt2_neg, ASR, 1); 4357 BIND(DONE); 4358 } 4359 4360 // Compare strings. 4361 void MacroAssembler::string_compare(Register str1, Register str2, 4362 Register cnt1, Register cnt2, Register result, 4363 Register tmp1) { 4364 Label LENGTH_DIFF, DONE, SHORT_LOOP, SHORT_STRING, 4365 NEXT_WORD, DIFFERENCE; 4366 4367 BLOCK_COMMENT("string_compare {"); 4368 4369 // Compute the minimum of the string lengths and save the difference. 4370 subsw(tmp1, cnt1, cnt2); 4371 cselw(cnt2, cnt1, cnt2, Assembler::LE); // min 4372 4373 // A very short string 4374 cmpw(cnt2, 4); 4375 br(Assembler::LT, SHORT_STRING); 4376 4377 // Check if the strings start at the same location. 4378 cmp(str1, str2); 4379 br(Assembler::EQ, LENGTH_DIFF); 4380 4381 // Compare longwords 4382 { 4383 subw(cnt2, cnt2, 4); // The last longword is a special case 4384 4385 // Move both string pointers to the last longword of their 4386 // strings, negate the remaining count, and convert it to bytes. 4387 lea(str1, Address(str1, cnt2, Address::uxtw(1))); 4388 lea(str2, Address(str2, cnt2, Address::uxtw(1))); 4389 sub(cnt2, zr, cnt2, LSL, 1); 4390 4391 // Loop, loading longwords and comparing them into rscratch2. 4392 bind(NEXT_WORD); 4393 ldr(result, Address(str1, cnt2)); 4394 ldr(cnt1, Address(str2, cnt2)); 4395 adds(cnt2, cnt2, wordSize); 4396 eor(rscratch2, result, cnt1); 4397 cbnz(rscratch2, DIFFERENCE); 4398 br(Assembler::LT, NEXT_WORD); 4399 4400 // Last longword. In the case where length == 4 we compare the 4401 // same longword twice, but that's still faster than another 4402 // conditional branch. 4403 4404 ldr(result, Address(str1)); 4405 ldr(cnt1, Address(str2)); 4406 eor(rscratch2, result, cnt1); 4407 cbz(rscratch2, LENGTH_DIFF); 4408 4409 // Find the first different characters in the longwords and 4410 // compute their difference. 4411 bind(DIFFERENCE); 4412 rev(rscratch2, rscratch2); 4413 clz(rscratch2, rscratch2); 4414 andr(rscratch2, rscratch2, -16); 4415 lsrv(result, result, rscratch2); 4416 uxthw(result, result); 4417 lsrv(cnt1, cnt1, rscratch2); 4418 uxthw(cnt1, cnt1); 4419 subw(result, result, cnt1); 4420 b(DONE); 4421 } 4422 4423 bind(SHORT_STRING); 4424 // Is the minimum length zero? 4425 cbz(cnt2, LENGTH_DIFF); 4426 4427 bind(SHORT_LOOP); 4428 load_unsigned_short(result, Address(post(str1, 2))); 4429 load_unsigned_short(cnt1, Address(post(str2, 2))); 4430 subw(result, result, cnt1); 4431 cbnz(result, DONE); 4432 sub(cnt2, cnt2, 1); 4433 cbnz(cnt2, SHORT_LOOP); 4434 4435 // Strings are equal up to min length. Return the length difference. 4436 bind(LENGTH_DIFF); 4437 mov(result, tmp1); 4438 4439 // That's it 4440 bind(DONE); 4441 4442 BLOCK_COMMENT("} string_compare"); 4443 } 4444 4445 4446 void MacroAssembler::string_equals(Register str1, Register str2, 4447 Register cnt, Register result, 4448 Register tmp1) { 4449 Label SAME_CHARS, DONE, SHORT_LOOP, SHORT_STRING, 4450 NEXT_WORD; 4451 4452 const Register tmp2 = rscratch1; 4453 assert_different_registers(str1, str2, cnt, result, tmp1, tmp2, rscratch2); 4454 4455 BLOCK_COMMENT("string_equals {"); 4456 4457 // Start by assuming that the strings are not equal. 4458 mov(result, zr); 4459 4460 // A very short string 4461 cmpw(cnt, 4); 4462 br(Assembler::LT, SHORT_STRING); 4463 4464 // Check if the strings start at the same location. 4465 cmp(str1, str2); 4466 br(Assembler::EQ, SAME_CHARS); 4467 4468 // Compare longwords 4469 { 4470 subw(cnt, cnt, 4); // The last longword is a special case 4471 4472 // Move both string pointers to the last longword of their 4473 // strings, negate the remaining count, and convert it to bytes. 4474 lea(str1, Address(str1, cnt, Address::uxtw(1))); 4475 lea(str2, Address(str2, cnt, Address::uxtw(1))); 4476 sub(cnt, zr, cnt, LSL, 1); 4477 4478 // Loop, loading longwords and comparing them into rscratch2. 4479 bind(NEXT_WORD); 4480 ldr(tmp1, Address(str1, cnt)); 4481 ldr(tmp2, Address(str2, cnt)); 4482 adds(cnt, cnt, wordSize); 4483 eor(rscratch2, tmp1, tmp2); 4484 cbnz(rscratch2, DONE); 4485 br(Assembler::LT, NEXT_WORD); 4486 4487 // Last longword. In the case where length == 4 we compare the 4488 // same longword twice, but that's still faster than another 4489 // conditional branch. 4490 4491 ldr(tmp1, Address(str1)); 4492 ldr(tmp2, Address(str2)); 4493 eor(rscratch2, tmp1, tmp2); 4494 cbz(rscratch2, SAME_CHARS); 4495 b(DONE); 4496 } 4497 4498 bind(SHORT_STRING); 4499 // Is the length zero? 4500 cbz(cnt, SAME_CHARS); 4501 4502 bind(SHORT_LOOP); 4503 load_unsigned_short(tmp1, Address(post(str1, 2))); 4504 load_unsigned_short(tmp2, Address(post(str2, 2))); 4505 subw(tmp1, tmp1, tmp2); 4506 cbnz(tmp1, DONE); 4507 sub(cnt, cnt, 1); 4508 cbnz(cnt, SHORT_LOOP); 4509 4510 // Strings are equal. 4511 bind(SAME_CHARS); 4512 mov(result, true); 4513 4514 // That's it 4515 bind(DONE); 4516 4517 BLOCK_COMMENT("} string_equals"); 4518 } 4519 4520 // Compare char[] arrays aligned to 4 bytes 4521 void MacroAssembler::char_arrays_equals(Register ary1, Register ary2, 4522 Register result, Register tmp1) 4523 { 4524 Register cnt1 = rscratch1; 4525 Register cnt2 = rscratch2; 4526 Register tmp2 = rscratch2; 4527 4528 Label SAME, DIFFER, NEXT, TAIL03, TAIL01; 4529 4530 int length_offset = arrayOopDesc::length_offset_in_bytes(); 4531 int base_offset = arrayOopDesc::base_offset_in_bytes(T_CHAR); 4532 4533 BLOCK_COMMENT("char_arrays_equals {"); 4534 4535 // different until proven equal 4536 mov(result, false); 4537 4538 // same array? 4539 cmp(ary1, ary2); 4540 br(Assembler::EQ, SAME); 4541 4542 // ne if either null 4543 cbz(ary1, DIFFER); 4544 cbz(ary2, DIFFER); 4545 4546 // lengths ne? 4547 ldrw(cnt1, Address(ary1, length_offset)); 4548 ldrw(cnt2, Address(ary2, length_offset)); 4549 cmp(cnt1, cnt2); 4550 br(Assembler::NE, DIFFER); 4551 4552 lea(ary1, Address(ary1, base_offset)); 4553 lea(ary2, Address(ary2, base_offset)); 4554 4555 subs(cnt1, cnt1, 4); 4556 br(LT, TAIL03); 4557 4558 BIND(NEXT); 4559 ldr(tmp1, Address(post(ary1, 8))); 4560 ldr(tmp2, Address(post(ary2, 8))); 4561 subs(cnt1, cnt1, 4); 4562 eor(tmp1, tmp1, tmp2); 4563 cbnz(tmp1, DIFFER); 4564 br(GE, NEXT); 4565 4566 BIND(TAIL03); // 0-3 chars left, cnt1 = #chars left - 4 4567 tst(cnt1, 0b10); 4568 br(EQ, TAIL01); 4569 ldrw(tmp1, Address(post(ary1, 4))); 4570 ldrw(tmp2, Address(post(ary2, 4))); 4571 cmp(tmp1, tmp2); 4572 br(NE, DIFFER); 4573 BIND(TAIL01); // 0-1 chars left 4574 tst(cnt1, 0b01); 4575 br(EQ, SAME); 4576 ldrh(tmp1, ary1); 4577 ldrh(tmp2, ary2); 4578 cmp(tmp1, tmp2); 4579 br(NE, DIFFER); 4580 4581 BIND(SAME); 4582 mov(result, true); 4583 BIND(DIFFER); // result already set 4584 4585 BLOCK_COMMENT("} char_arrays_equals"); 4586 } 4587 4588 // encode char[] to byte[] in ISO_8859_1 4589 void MacroAssembler::encode_iso_array(Register src, Register dst, 4590 Register len, Register result, 4591 FloatRegister Vtmp1, FloatRegister Vtmp2, 4592 FloatRegister Vtmp3, FloatRegister Vtmp4) 4593 { 4594 Label DONE, NEXT_32, LOOP_8, NEXT_8, LOOP_1, NEXT_1; 4595 Register tmp1 = rscratch1; 4596 4597 mov(result, len); // Save initial len 4598 4599 #ifndef BUILTIN_SIM 4600 subs(len, len, 32); 4601 br(LT, LOOP_8); 4602 4603 // The following code uses the SIMD 'uqxtn' and 'uqxtn2' instructions 4604 // to convert chars to bytes. These set the 'QC' bit in the FPSR if 4605 // any char could not fit in a byte, so clear the FPSR so we can test it. 4606 clear_fpsr(); 4607 4608 BIND(NEXT_32); 4609 ld1(Vtmp1, Vtmp2, Vtmp3, Vtmp4, T8H, src); 4610 uqxtn(Vtmp1, T8B, Vtmp1, T8H); // uqxtn - write bottom half 4611 uqxtn(Vtmp1, T16B, Vtmp2, T8H); // uqxtn2 - write top half 4612 uqxtn(Vtmp2, T8B, Vtmp3, T8H); 4613 uqxtn(Vtmp2, T16B, Vtmp4, T8H); // uqxtn2 4614 get_fpsr(tmp1); 4615 cbnzw(tmp1, LOOP_8); 4616 st1(Vtmp1, Vtmp2, T16B, post(dst, 32)); 4617 subs(len, len, 32); 4618 add(src, src, 64); 4619 br(GE, NEXT_32); 4620 4621 BIND(LOOP_8); 4622 adds(len, len, 32-8); 4623 br(LT, LOOP_1); 4624 clear_fpsr(); // QC may be set from loop above, clear again 4625 BIND(NEXT_8); 4626 ld1(Vtmp1, T8H, src); 4627 uqxtn(Vtmp1, T8B, Vtmp1, T8H); 4628 get_fpsr(tmp1); 4629 cbnzw(tmp1, LOOP_1); 4630 st1(Vtmp1, T8B, post(dst, 8)); 4631 subs(len, len, 8); 4632 add(src, src, 16); 4633 br(GE, NEXT_8); 4634 4635 BIND(LOOP_1); 4636 adds(len, len, 8); 4637 br(LE, DONE); 4638 #else 4639 cbz(len, DONE); 4640 #endif 4641 BIND(NEXT_1); 4642 ldrh(tmp1, Address(post(src, 2))); 4643 tst(tmp1, 0xff00); 4644 br(NE, DONE); 4645 strb(tmp1, Address(post(dst, 1))); 4646 subs(len, len, 1); 4647 br(GT, NEXT_1); 4648 4649 BIND(DONE); 4650 sub(result, result, len); // Return index where we stopped 4651 }