1 /* 2 * Copyright (c) 2003, 2023, Oracle and/or its affiliates. All rights reserved. 3 * Copyright (c) 2014, 2021, Red Hat Inc. All rights reserved. 4 * Copyright (c) 2021, Azul Systems, Inc. All rights reserved. 5 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 6 * 7 * This code is free software; you can redistribute it and/or modify it 8 * under the terms of the GNU General Public License version 2 only, as 9 * published by the Free Software Foundation. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 * 25 */ 26 27 #include "precompiled.hpp" 28 #include "asm/macroAssembler.hpp" 29 #include "asm/macroAssembler.inline.hpp" 30 #include "code/codeCache.hpp" 31 #include "code/compiledIC.hpp" 32 #include "code/debugInfoRec.hpp" 33 #include "code/icBuffer.hpp" 34 #include "code/vtableStubs.hpp" 35 #include "compiler/oopMap.hpp" 36 #include "gc/shared/barrierSetAssembler.hpp" 37 #include "interpreter/interpreter.hpp" 38 #include "interpreter/interp_masm.hpp" 39 #include "logging/log.hpp" 40 #include "memory/resourceArea.hpp" 41 #include "nativeInst_aarch64.hpp" 42 #include "oops/compiledICHolder.hpp" 43 #include "oops/klass.inline.hpp" 44 #include "oops/method.inline.hpp" 45 #include "prims/methodHandles.hpp" 46 #include "runtime/continuation.hpp" 47 #include "runtime/continuationEntry.inline.hpp" 48 #include "runtime/globals.hpp" 49 #include "runtime/jniHandles.hpp" 50 #include "runtime/safepointMechanism.hpp" 51 #include "runtime/sharedRuntime.hpp" 52 #include "runtime/signature.hpp" 53 #include "runtime/stubRoutines.hpp" 54 #include "runtime/vframeArray.hpp" 55 #include "utilities/align.hpp" 56 #include "utilities/formatBuffer.hpp" 57 #include "vmreg_aarch64.inline.hpp" 58 #ifdef COMPILER1 59 #include "c1/c1_Runtime1.hpp" 60 #endif 61 #ifdef COMPILER2 62 #include "adfiles/ad_aarch64.hpp" 63 #include "opto/runtime.hpp" 64 #endif 65 #if INCLUDE_JVMCI 66 #include "jvmci/jvmciJavaClasses.hpp" 67 #endif 68 69 #define __ masm-> 70 71 const int StackAlignmentInSlots = StackAlignmentInBytes / VMRegImpl::stack_slot_size; 72 73 class SimpleRuntimeFrame { 74 75 public: 76 77 // Most of the runtime stubs have this simple frame layout. 78 // This class exists to make the layout shared in one place. 79 // Offsets are for compiler stack slots, which are jints. 80 enum layout { 81 // The frame sender code expects that rbp will be in the "natural" place and 82 // will override any oopMap setting for it. We must therefore force the layout 83 // so that it agrees with the frame sender code. 84 // we don't expect any arg reg save area so aarch64 asserts that 85 // frame::arg_reg_save_area_bytes == 0 86 rfp_off = 0, 87 rfp_off2, 88 return_off, return_off2, 89 framesize 90 }; 91 }; 92 93 // FIXME -- this is used by C1 94 class RegisterSaver { 95 const bool _save_vectors; 96 public: 97 RegisterSaver(bool save_vectors) : _save_vectors(save_vectors) {} 98 99 OopMap* save_live_registers(MacroAssembler* masm, int additional_frame_words, int* total_frame_words); 100 void restore_live_registers(MacroAssembler* masm); 101 102 // Offsets into the register save area 103 // Used by deoptimization when it is managing result register 104 // values on its own 105 106 int reg_offset_in_bytes(Register r); 107 int r0_offset_in_bytes() { return reg_offset_in_bytes(r0); } 108 int rscratch1_offset_in_bytes() { return reg_offset_in_bytes(rscratch1); } 109 int v0_offset_in_bytes(); 110 111 // Total stack size in bytes for saving sve predicate registers. 112 int total_sve_predicate_in_bytes(); 113 114 // Capture info about frame layout 115 // Note this is only correct when not saving full vectors. 116 enum layout { 117 fpu_state_off = 0, 118 fpu_state_end = fpu_state_off + FPUStateSizeInWords - 1, 119 // The frame sender code expects that rfp will be in 120 // the "natural" place and will override any oopMap 121 // setting for it. We must therefore force the layout 122 // so that it agrees with the frame sender code. 123 r0_off = fpu_state_off + FPUStateSizeInWords, 124 rfp_off = r0_off + (Register::number_of_registers - 2) * Register::max_slots_per_register, 125 return_off = rfp_off + Register::max_slots_per_register, // slot for return address 126 reg_save_size = return_off + Register::max_slots_per_register}; 127 128 }; 129 130 int RegisterSaver::reg_offset_in_bytes(Register r) { 131 // The integer registers are located above the floating point 132 // registers in the stack frame pushed by save_live_registers() so the 133 // offset depends on whether we are saving full vectors, and whether 134 // those vectors are NEON or SVE. 135 136 int slots_per_vect = FloatRegister::save_slots_per_register; 137 138 #if COMPILER2_OR_JVMCI 139 if (_save_vectors) { 140 slots_per_vect = FloatRegister::slots_per_neon_register; 141 142 #ifdef COMPILER2 143 if (Matcher::supports_scalable_vector()) { 144 slots_per_vect = Matcher::scalable_vector_reg_size(T_FLOAT); 145 } 146 #endif 147 } 148 #endif 149 150 int r0_offset = v0_offset_in_bytes() + (slots_per_vect * FloatRegister::number_of_registers) * BytesPerInt; 151 return r0_offset + r->encoding() * wordSize; 152 } 153 154 int RegisterSaver::v0_offset_in_bytes() { 155 // The floating point registers are located above the predicate registers if 156 // they are present in the stack frame pushed by save_live_registers(). So the 157 // offset depends on the saved total predicate vectors in the stack frame. 158 return (total_sve_predicate_in_bytes() / VMRegImpl::stack_slot_size) * BytesPerInt; 159 } 160 161 int RegisterSaver::total_sve_predicate_in_bytes() { 162 #ifdef COMPILER2 163 if (_save_vectors && Matcher::supports_scalable_vector()) { 164 return (Matcher::scalable_vector_reg_size(T_BYTE) >> LogBitsPerByte) * 165 PRegister::number_of_registers; 166 } 167 #endif 168 return 0; 169 } 170 171 OopMap* RegisterSaver::save_live_registers(MacroAssembler* masm, int additional_frame_words, int* total_frame_words) { 172 bool use_sve = false; 173 int sve_vector_size_in_bytes = 0; 174 int sve_vector_size_in_slots = 0; 175 int sve_predicate_size_in_slots = 0; 176 int total_predicate_in_bytes = total_sve_predicate_in_bytes(); 177 int total_predicate_in_slots = total_predicate_in_bytes / VMRegImpl::stack_slot_size; 178 179 #ifdef COMPILER2 180 use_sve = Matcher::supports_scalable_vector(); 181 if (use_sve) { 182 sve_vector_size_in_bytes = Matcher::scalable_vector_reg_size(T_BYTE); 183 sve_vector_size_in_slots = Matcher::scalable_vector_reg_size(T_FLOAT); 184 sve_predicate_size_in_slots = Matcher::scalable_predicate_reg_slots(); 185 } 186 #endif 187 188 #if COMPILER2_OR_JVMCI 189 if (_save_vectors) { 190 int extra_save_slots_per_register = 0; 191 // Save upper half of vector registers 192 if (use_sve) { 193 extra_save_slots_per_register = sve_vector_size_in_slots - FloatRegister::save_slots_per_register; 194 } else { 195 extra_save_slots_per_register = FloatRegister::extra_save_slots_per_neon_register; 196 } 197 int extra_vector_bytes = extra_save_slots_per_register * 198 VMRegImpl::stack_slot_size * 199 FloatRegister::number_of_registers; 200 additional_frame_words += ((extra_vector_bytes + total_predicate_in_bytes) / wordSize); 201 } 202 #else 203 assert(!_save_vectors, "vectors are generated only by C2 and JVMCI"); 204 #endif 205 206 int frame_size_in_bytes = align_up(additional_frame_words * wordSize + 207 reg_save_size * BytesPerInt, 16); 208 // OopMap frame size is in compiler stack slots (jint's) not bytes or words 209 int frame_size_in_slots = frame_size_in_bytes / BytesPerInt; 210 // The caller will allocate additional_frame_words 211 int additional_frame_slots = additional_frame_words * wordSize / BytesPerInt; 212 // CodeBlob frame size is in words. 213 int frame_size_in_words = frame_size_in_bytes / wordSize; 214 *total_frame_words = frame_size_in_words; 215 216 // Save Integer and Float registers. 217 __ enter(); 218 __ push_CPU_state(_save_vectors, use_sve, sve_vector_size_in_bytes, total_predicate_in_bytes); 219 220 // Set an oopmap for the call site. This oopmap will map all 221 // oop-registers and debug-info registers as callee-saved. This 222 // will allow deoptimization at this safepoint to find all possible 223 // debug-info recordings, as well as let GC find all oops. 224 225 OopMapSet *oop_maps = new OopMapSet(); 226 OopMap* oop_map = new OopMap(frame_size_in_slots, 0); 227 228 for (int i = 0; i < Register::number_of_registers; i++) { 229 Register r = as_Register(i); 230 if (i <= rfp->encoding() && r != rscratch1 && r != rscratch2) { 231 // SP offsets are in 4-byte words. 232 // Register slots are 8 bytes wide, 32 floating-point registers. 233 int sp_offset = Register::max_slots_per_register * i + 234 FloatRegister::save_slots_per_register * FloatRegister::number_of_registers; 235 oop_map->set_callee_saved(VMRegImpl::stack2reg(sp_offset + additional_frame_slots), r->as_VMReg()); 236 } 237 } 238 239 for (int i = 0; i < FloatRegister::number_of_registers; i++) { 240 FloatRegister r = as_FloatRegister(i); 241 int sp_offset = 0; 242 if (_save_vectors) { 243 sp_offset = use_sve ? (total_predicate_in_slots + sve_vector_size_in_slots * i) : 244 (FloatRegister::slots_per_neon_register * i); 245 } else { 246 sp_offset = FloatRegister::save_slots_per_register * i; 247 } 248 oop_map->set_callee_saved(VMRegImpl::stack2reg(sp_offset), r->as_VMReg()); 249 } 250 251 return oop_map; 252 } 253 254 void RegisterSaver::restore_live_registers(MacroAssembler* masm) { 255 #ifdef COMPILER2 256 __ pop_CPU_state(_save_vectors, Matcher::supports_scalable_vector(), 257 Matcher::scalable_vector_reg_size(T_BYTE), total_sve_predicate_in_bytes()); 258 #else 259 #if !INCLUDE_JVMCI 260 assert(!_save_vectors, "vectors are generated only by C2 and JVMCI"); 261 #endif 262 __ pop_CPU_state(_save_vectors); 263 #endif 264 __ ldp(rfp, lr, Address(__ post(sp, 2 * wordSize))); 265 __ authenticate_return_address(); 266 } 267 268 // Is vector's size (in bytes) bigger than a size saved by default? 269 // 8 bytes vector registers are saved by default on AArch64. 270 // The SVE supported min vector size is 8 bytes and we need to save 271 // predicate registers when the vector size is 8 bytes as well. 272 bool SharedRuntime::is_wide_vector(int size) { 273 return size > 8 || (UseSVE > 0 && size >= 8); 274 } 275 276 // --------------------------------------------------------------------------- 277 // Read the array of BasicTypes from a signature, and compute where the 278 // arguments should go. Values in the VMRegPair regs array refer to 4-byte 279 // quantities. Values less than VMRegImpl::stack0 are registers, those above 280 // refer to 4-byte stack slots. All stack slots are based off of the stack pointer 281 // as framesizes are fixed. 282 // VMRegImpl::stack0 refers to the first slot 0(sp). 283 // and VMRegImpl::stack0+1 refers to the memory word 4-byes higher. 284 // Register up to Register::number_of_registers are the 64-bit 285 // integer registers. 286 287 // Note: the INPUTS in sig_bt are in units of Java argument words, 288 // which are 64-bit. The OUTPUTS are in 32-bit units. 289 290 // The Java calling convention is a "shifted" version of the C ABI. 291 // By skipping the first C ABI register we can call non-static jni 292 // methods with small numbers of arguments without having to shuffle 293 // the arguments at all. Since we control the java ABI we ought to at 294 // least get some advantage out of it. 295 296 int SharedRuntime::java_calling_convention(const BasicType *sig_bt, 297 VMRegPair *regs, 298 int total_args_passed) { 299 300 // Create the mapping between argument positions and 301 // registers. 302 static const Register INT_ArgReg[Argument::n_int_register_parameters_j] = { 303 j_rarg0, j_rarg1, j_rarg2, j_rarg3, j_rarg4, j_rarg5, j_rarg6, j_rarg7 304 }; 305 static const FloatRegister FP_ArgReg[Argument::n_float_register_parameters_j] = { 306 j_farg0, j_farg1, j_farg2, j_farg3, 307 j_farg4, j_farg5, j_farg6, j_farg7 308 }; 309 310 311 uint int_args = 0; 312 uint fp_args = 0; 313 uint stk_args = 0; // inc by 2 each time 314 315 for (int i = 0; i < total_args_passed; i++) { 316 switch (sig_bt[i]) { 317 case T_BOOLEAN: 318 case T_CHAR: 319 case T_BYTE: 320 case T_SHORT: 321 case T_INT: 322 if (int_args < Argument::n_int_register_parameters_j) { 323 regs[i].set1(INT_ArgReg[int_args++]->as_VMReg()); 324 } else { 325 regs[i].set1(VMRegImpl::stack2reg(stk_args)); 326 stk_args += 2; 327 } 328 break; 329 case T_VOID: 330 // halves of T_LONG or T_DOUBLE 331 assert(i != 0 && (sig_bt[i - 1] == T_LONG || sig_bt[i - 1] == T_DOUBLE), "expecting half"); 332 regs[i].set_bad(); 333 break; 334 case T_LONG: 335 assert((i + 1) < total_args_passed && sig_bt[i + 1] == T_VOID, "expecting half"); 336 // fall through 337 case T_OBJECT: 338 case T_ARRAY: 339 case T_ADDRESS: 340 if (int_args < Argument::n_int_register_parameters_j) { 341 regs[i].set2(INT_ArgReg[int_args++]->as_VMReg()); 342 } else { 343 regs[i].set2(VMRegImpl::stack2reg(stk_args)); 344 stk_args += 2; 345 } 346 break; 347 case T_FLOAT: 348 if (fp_args < Argument::n_float_register_parameters_j) { 349 regs[i].set1(FP_ArgReg[fp_args++]->as_VMReg()); 350 } else { 351 regs[i].set1(VMRegImpl::stack2reg(stk_args)); 352 stk_args += 2; 353 } 354 break; 355 case T_DOUBLE: 356 assert((i + 1) < total_args_passed && sig_bt[i + 1] == T_VOID, "expecting half"); 357 if (fp_args < Argument::n_float_register_parameters_j) { 358 regs[i].set2(FP_ArgReg[fp_args++]->as_VMReg()); 359 } else { 360 regs[i].set2(VMRegImpl::stack2reg(stk_args)); 361 stk_args += 2; 362 } 363 break; 364 default: 365 ShouldNotReachHere(); 366 break; 367 } 368 } 369 370 return align_up(stk_args, 2); 371 } 372 373 // Patch the callers callsite with entry to compiled code if it exists. 374 static void patch_callers_callsite(MacroAssembler *masm) { 375 Label L; 376 __ ldr(rscratch1, Address(rmethod, in_bytes(Method::code_offset()))); 377 __ cbz(rscratch1, L); 378 379 __ enter(); 380 __ push_CPU_state(); 381 382 // VM needs caller's callsite 383 // VM needs target method 384 // This needs to be a long call since we will relocate this adapter to 385 // the codeBuffer and it may not reach 386 387 #ifndef PRODUCT 388 assert(frame::arg_reg_save_area_bytes == 0, "not expecting frame reg save area"); 389 #endif 390 391 __ mov(c_rarg0, rmethod); 392 __ mov(c_rarg1, lr); 393 __ authenticate_return_address(c_rarg1, rscratch1); 394 __ lea(rscratch1, RuntimeAddress(CAST_FROM_FN_PTR(address, SharedRuntime::fixup_callers_callsite))); 395 __ blr(rscratch1); 396 397 // Explicit isb required because fixup_callers_callsite may change the code 398 // stream. 399 __ safepoint_isb(); 400 401 __ pop_CPU_state(); 402 // restore sp 403 __ leave(); 404 __ bind(L); 405 } 406 407 static void gen_c2i_adapter(MacroAssembler *masm, 408 int total_args_passed, 409 int comp_args_on_stack, 410 const BasicType *sig_bt, 411 const VMRegPair *regs, 412 Label& skip_fixup) { 413 // Before we get into the guts of the C2I adapter, see if we should be here 414 // at all. We've come from compiled code and are attempting to jump to the 415 // interpreter, which means the caller made a static call to get here 416 // (vcalls always get a compiled target if there is one). Check for a 417 // compiled target. If there is one, we need to patch the caller's call. 418 patch_callers_callsite(masm); 419 420 __ bind(skip_fixup); 421 422 int words_pushed = 0; 423 424 // Since all args are passed on the stack, total_args_passed * 425 // Interpreter::stackElementSize is the space we need. 426 427 int extraspace = total_args_passed * Interpreter::stackElementSize; 428 429 __ mov(r19_sender_sp, sp); 430 431 // stack is aligned, keep it that way 432 extraspace = align_up(extraspace, 2*wordSize); 433 434 if (extraspace) 435 __ sub(sp, sp, extraspace); 436 437 // Now write the args into the outgoing interpreter space 438 for (int i = 0; i < total_args_passed; i++) { 439 if (sig_bt[i] == T_VOID) { 440 assert(i > 0 && (sig_bt[i-1] == T_LONG || sig_bt[i-1] == T_DOUBLE), "missing half"); 441 continue; 442 } 443 444 // offset to start parameters 445 int st_off = (total_args_passed - i - 1) * Interpreter::stackElementSize; 446 int next_off = st_off - Interpreter::stackElementSize; 447 448 // Say 4 args: 449 // i st_off 450 // 0 32 T_LONG 451 // 1 24 T_VOID 452 // 2 16 T_OBJECT 453 // 3 8 T_BOOL 454 // - 0 return address 455 // 456 // However to make thing extra confusing. Because we can fit a Java long/double in 457 // a single slot on a 64 bt vm and it would be silly to break them up, the interpreter 458 // leaves one slot empty and only stores to a single slot. In this case the 459 // slot that is occupied is the T_VOID slot. See I said it was confusing. 460 461 VMReg r_1 = regs[i].first(); 462 VMReg r_2 = regs[i].second(); 463 if (!r_1->is_valid()) { 464 assert(!r_2->is_valid(), ""); 465 continue; 466 } 467 if (r_1->is_stack()) { 468 // memory to memory use rscratch1 469 int ld_off = (r_1->reg2stack() * VMRegImpl::stack_slot_size 470 + extraspace 471 + words_pushed * wordSize); 472 if (!r_2->is_valid()) { 473 // sign extend?? 474 __ ldrw(rscratch1, Address(sp, ld_off)); 475 __ str(rscratch1, Address(sp, st_off)); 476 477 } else { 478 479 __ ldr(rscratch1, Address(sp, ld_off)); 480 481 // Two VMREgs|OptoRegs can be T_OBJECT, T_ADDRESS, T_DOUBLE, T_LONG 482 // T_DOUBLE and T_LONG use two slots in the interpreter 483 if ( sig_bt[i] == T_LONG || sig_bt[i] == T_DOUBLE) { 484 // ld_off == LSW, ld_off+wordSize == MSW 485 // st_off == MSW, next_off == LSW 486 __ str(rscratch1, Address(sp, next_off)); 487 #ifdef ASSERT 488 // Overwrite the unused slot with known junk 489 __ mov(rscratch1, (uint64_t)0xdeadffffdeadaaaaull); 490 __ str(rscratch1, Address(sp, st_off)); 491 #endif /* ASSERT */ 492 } else { 493 __ str(rscratch1, Address(sp, st_off)); 494 } 495 } 496 } else if (r_1->is_Register()) { 497 Register r = r_1->as_Register(); 498 if (!r_2->is_valid()) { 499 // must be only an int (or less ) so move only 32bits to slot 500 // why not sign extend?? 501 __ str(r, Address(sp, st_off)); 502 } else { 503 // Two VMREgs|OptoRegs can be T_OBJECT, T_ADDRESS, T_DOUBLE, T_LONG 504 // T_DOUBLE and T_LONG use two slots in the interpreter 505 if ( sig_bt[i] == T_LONG || sig_bt[i] == T_DOUBLE) { 506 // jlong/double in gpr 507 #ifdef ASSERT 508 // Overwrite the unused slot with known junk 509 __ mov(rscratch1, (uint64_t)0xdeadffffdeadaaabull); 510 __ str(rscratch1, Address(sp, st_off)); 511 #endif /* ASSERT */ 512 __ str(r, Address(sp, next_off)); 513 } else { 514 __ str(r, Address(sp, st_off)); 515 } 516 } 517 } else { 518 assert(r_1->is_FloatRegister(), ""); 519 if (!r_2->is_valid()) { 520 // only a float use just part of the slot 521 __ strs(r_1->as_FloatRegister(), Address(sp, st_off)); 522 } else { 523 #ifdef ASSERT 524 // Overwrite the unused slot with known junk 525 __ mov(rscratch1, (uint64_t)0xdeadffffdeadaaacull); 526 __ str(rscratch1, Address(sp, st_off)); 527 #endif /* ASSERT */ 528 __ strd(r_1->as_FloatRegister(), Address(sp, next_off)); 529 } 530 } 531 } 532 533 __ mov(esp, sp); // Interp expects args on caller's expression stack 534 535 __ ldr(rscratch1, Address(rmethod, in_bytes(Method::interpreter_entry_offset()))); 536 __ br(rscratch1); 537 } 538 539 540 void SharedRuntime::gen_i2c_adapter(MacroAssembler *masm, 541 int total_args_passed, 542 int comp_args_on_stack, 543 const BasicType *sig_bt, 544 const VMRegPair *regs) { 545 546 // Note: r19_sender_sp contains the senderSP on entry. We must 547 // preserve it since we may do a i2c -> c2i transition if we lose a 548 // race where compiled code goes non-entrant while we get args 549 // ready. 550 551 // Adapters are frameless. 552 553 // An i2c adapter is frameless because the *caller* frame, which is 554 // interpreted, routinely repairs its own esp (from 555 // interpreter_frame_last_sp), even if a callee has modified the 556 // stack pointer. It also recalculates and aligns sp. 557 558 // A c2i adapter is frameless because the *callee* frame, which is 559 // interpreted, routinely repairs its caller's sp (from sender_sp, 560 // which is set up via the senderSP register). 561 562 // In other words, if *either* the caller or callee is interpreted, we can 563 // get the stack pointer repaired after a call. 564 565 // This is why c2i and i2c adapters cannot be indefinitely composed. 566 // In particular, if a c2i adapter were to somehow call an i2c adapter, 567 // both caller and callee would be compiled methods, and neither would 568 // clean up the stack pointer changes performed by the two adapters. 569 // If this happens, control eventually transfers back to the compiled 570 // caller, but with an uncorrected stack, causing delayed havoc. 571 572 if (VerifyAdapterCalls && 573 (Interpreter::code() != nullptr || StubRoutines::final_stubs_code() != nullptr)) { 574 #if 0 575 // So, let's test for cascading c2i/i2c adapters right now. 576 // assert(Interpreter::contains($return_addr) || 577 // StubRoutines::contains($return_addr), 578 // "i2c adapter must return to an interpreter frame"); 579 __ block_comment("verify_i2c { "); 580 Label L_ok; 581 if (Interpreter::code() != nullptr) { 582 range_check(masm, rax, r11, 583 Interpreter::code()->code_start(), Interpreter::code()->code_end(), 584 L_ok); 585 } 586 if (StubRoutines::initial_stubs_code() != nullptr) { 587 range_check(masm, rax, r11, 588 StubRoutines::initial_stubs_code()->code_begin(), 589 StubRoutines::initial_stubs_code()->code_end(), 590 L_ok); 591 } 592 if (StubRoutines::final_stubs_code() != nullptr) { 593 range_check(masm, rax, r11, 594 StubRoutines::final_stubs_code()->code_begin(), 595 StubRoutines::final_stubs_code()->code_end(), 596 L_ok); 597 } 598 const char* msg = "i2c adapter must return to an interpreter frame"; 599 __ block_comment(msg); 600 __ stop(msg); 601 __ bind(L_ok); 602 __ block_comment("} verify_i2ce "); 603 #endif 604 } 605 606 // Cut-out for having no stack args. 607 int comp_words_on_stack = align_up(comp_args_on_stack*VMRegImpl::stack_slot_size, wordSize)>>LogBytesPerWord; 608 if (comp_args_on_stack) { 609 __ sub(rscratch1, sp, comp_words_on_stack * wordSize); 610 __ andr(sp, rscratch1, -16); 611 } 612 613 // Will jump to the compiled code just as if compiled code was doing it. 614 // Pre-load the register-jump target early, to schedule it better. 615 __ ldr(rscratch1, Address(rmethod, in_bytes(Method::from_compiled_offset()))); 616 617 #if INCLUDE_JVMCI 618 if (EnableJVMCI) { 619 // check if this call should be routed towards a specific entry point 620 __ ldr(rscratch2, Address(rthread, in_bytes(JavaThread::jvmci_alternate_call_target_offset()))); 621 Label no_alternative_target; 622 __ cbz(rscratch2, no_alternative_target); 623 __ mov(rscratch1, rscratch2); 624 __ str(zr, Address(rthread, in_bytes(JavaThread::jvmci_alternate_call_target_offset()))); 625 __ bind(no_alternative_target); 626 } 627 #endif // INCLUDE_JVMCI 628 629 // Now generate the shuffle code. 630 for (int i = 0; i < total_args_passed; i++) { 631 if (sig_bt[i] == T_VOID) { 632 assert(i > 0 && (sig_bt[i-1] == T_LONG || sig_bt[i-1] == T_DOUBLE), "missing half"); 633 continue; 634 } 635 636 // Pick up 0, 1 or 2 words from SP+offset. 637 638 assert(!regs[i].second()->is_valid() || regs[i].first()->next() == regs[i].second(), 639 "scrambled load targets?"); 640 // Load in argument order going down. 641 int ld_off = (total_args_passed - i - 1)*Interpreter::stackElementSize; 642 // Point to interpreter value (vs. tag) 643 int next_off = ld_off - Interpreter::stackElementSize; 644 // 645 // 646 // 647 VMReg r_1 = regs[i].first(); 648 VMReg r_2 = regs[i].second(); 649 if (!r_1->is_valid()) { 650 assert(!r_2->is_valid(), ""); 651 continue; 652 } 653 if (r_1->is_stack()) { 654 // Convert stack slot to an SP offset (+ wordSize to account for return address ) 655 int st_off = regs[i].first()->reg2stack()*VMRegImpl::stack_slot_size; 656 if (!r_2->is_valid()) { 657 // sign extend??? 658 __ ldrsw(rscratch2, Address(esp, ld_off)); 659 __ str(rscratch2, Address(sp, st_off)); 660 } else { 661 // 662 // We are using two optoregs. This can be either T_OBJECT, 663 // T_ADDRESS, T_LONG, or T_DOUBLE the interpreter allocates 664 // two slots but only uses one for thr T_LONG or T_DOUBLE case 665 // So we must adjust where to pick up the data to match the 666 // interpreter. 667 // 668 // Interpreter local[n] == MSW, local[n+1] == LSW however locals 669 // are accessed as negative so LSW is at LOW address 670 671 // ld_off is MSW so get LSW 672 const int offset = (sig_bt[i]==T_LONG||sig_bt[i]==T_DOUBLE)? 673 next_off : ld_off; 674 __ ldr(rscratch2, Address(esp, offset)); 675 // st_off is LSW (i.e. reg.first()) 676 __ str(rscratch2, Address(sp, st_off)); 677 } 678 } else if (r_1->is_Register()) { // Register argument 679 Register r = r_1->as_Register(); 680 if (r_2->is_valid()) { 681 // 682 // We are using two VMRegs. This can be either T_OBJECT, 683 // T_ADDRESS, T_LONG, or T_DOUBLE the interpreter allocates 684 // two slots but only uses one for thr T_LONG or T_DOUBLE case 685 // So we must adjust where to pick up the data to match the 686 // interpreter. 687 688 const int offset = (sig_bt[i]==T_LONG||sig_bt[i]==T_DOUBLE)? 689 next_off : ld_off; 690 691 // this can be a misaligned move 692 __ ldr(r, Address(esp, offset)); 693 } else { 694 // sign extend and use a full word? 695 __ ldrw(r, Address(esp, ld_off)); 696 } 697 } else { 698 if (!r_2->is_valid()) { 699 __ ldrs(r_1->as_FloatRegister(), Address(esp, ld_off)); 700 } else { 701 __ ldrd(r_1->as_FloatRegister(), Address(esp, next_off)); 702 } 703 } 704 } 705 706 __ mov(rscratch2, rscratch1); 707 __ push_cont_fastpath(rthread); // Set JavaThread::_cont_fastpath to the sp of the oldest interpreted frame we know about; kills rscratch1 708 __ mov(rscratch1, rscratch2); 709 710 // 6243940 We might end up in handle_wrong_method if 711 // the callee is deoptimized as we race thru here. If that 712 // happens we don't want to take a safepoint because the 713 // caller frame will look interpreted and arguments are now 714 // "compiled" so it is much better to make this transition 715 // invisible to the stack walking code. Unfortunately if 716 // we try and find the callee by normal means a safepoint 717 // is possible. So we stash the desired callee in the thread 718 // and the vm will find there should this case occur. 719 720 __ str(rmethod, Address(rthread, JavaThread::callee_target_offset())); 721 722 __ br(rscratch1); 723 } 724 725 // --------------------------------------------------------------- 726 AdapterHandlerEntry* SharedRuntime::generate_i2c2i_adapters(MacroAssembler *masm, 727 int total_args_passed, 728 int comp_args_on_stack, 729 const BasicType *sig_bt, 730 const VMRegPair *regs, 731 AdapterFingerPrint* fingerprint) { 732 address i2c_entry = __ pc(); 733 734 gen_i2c_adapter(masm, total_args_passed, comp_args_on_stack, sig_bt, regs); 735 736 address c2i_unverified_entry = __ pc(); 737 Label skip_fixup; 738 739 Label ok; 740 741 Register holder = rscratch2; 742 Register receiver = j_rarg0; 743 Register tmp = r10; // A call-clobbered register not used for arg passing 744 745 // ------------------------------------------------------------------------- 746 // Generate a C2I adapter. On entry we know rmethod holds the Method* during calls 747 // to the interpreter. The args start out packed in the compiled layout. They 748 // need to be unpacked into the interpreter layout. This will almost always 749 // require some stack space. We grow the current (compiled) stack, then repack 750 // the args. We finally end in a jump to the generic interpreter entry point. 751 // On exit from the interpreter, the interpreter will restore our SP (lest the 752 // compiled code, which relies solely on SP and not FP, get sick). 753 754 { 755 __ block_comment("c2i_unverified_entry {"); 756 __ load_klass(rscratch1, receiver); 757 __ ldr(tmp, Address(holder, CompiledICHolder::holder_klass_offset())); 758 __ cmp(rscratch1, tmp); 759 __ ldr(rmethod, Address(holder, CompiledICHolder::holder_metadata_offset())); 760 __ br(Assembler::EQ, ok); 761 __ far_jump(RuntimeAddress(SharedRuntime::get_ic_miss_stub())); 762 763 __ bind(ok); 764 // Method might have been compiled since the call site was patched to 765 // interpreted; if that is the case treat it as a miss so we can get 766 // the call site corrected. 767 __ ldr(rscratch1, Address(rmethod, in_bytes(Method::code_offset()))); 768 __ cbz(rscratch1, skip_fixup); 769 __ far_jump(RuntimeAddress(SharedRuntime::get_ic_miss_stub())); 770 __ block_comment("} c2i_unverified_entry"); 771 } 772 773 address c2i_entry = __ pc(); 774 775 // Class initialization barrier for static methods 776 address c2i_no_clinit_check_entry = nullptr; 777 if (VM_Version::supports_fast_class_init_checks()) { 778 Label L_skip_barrier; 779 780 { // Bypass the barrier for non-static methods 781 __ ldrw(rscratch1, Address(rmethod, Method::access_flags_offset())); 782 __ andsw(zr, rscratch1, JVM_ACC_STATIC); 783 __ br(Assembler::EQ, L_skip_barrier); // non-static 784 } 785 786 __ load_method_holder(rscratch2, rmethod); 787 __ clinit_barrier(rscratch2, rscratch1, &L_skip_barrier); 788 __ far_jump(RuntimeAddress(SharedRuntime::get_handle_wrong_method_stub())); 789 790 __ bind(L_skip_barrier); 791 c2i_no_clinit_check_entry = __ pc(); 792 } 793 794 BarrierSetAssembler* bs = BarrierSet::barrier_set()->barrier_set_assembler(); 795 bs->c2i_entry_barrier(masm); 796 797 gen_c2i_adapter(masm, total_args_passed, comp_args_on_stack, sig_bt, regs, skip_fixup); 798 799 return AdapterHandlerLibrary::new_entry(fingerprint, i2c_entry, c2i_entry, c2i_unverified_entry, c2i_no_clinit_check_entry); 800 } 801 802 static int c_calling_convention_priv(const BasicType *sig_bt, 803 VMRegPair *regs, 804 VMRegPair *regs2, 805 int total_args_passed) { 806 assert(regs2 == nullptr, "not needed on AArch64"); 807 808 // We return the amount of VMRegImpl stack slots we need to reserve for all 809 // the arguments NOT counting out_preserve_stack_slots. 810 811 static const Register INT_ArgReg[Argument::n_int_register_parameters_c] = { 812 c_rarg0, c_rarg1, c_rarg2, c_rarg3, c_rarg4, c_rarg5, c_rarg6, c_rarg7 813 }; 814 static const FloatRegister FP_ArgReg[Argument::n_float_register_parameters_c] = { 815 c_farg0, c_farg1, c_farg2, c_farg3, 816 c_farg4, c_farg5, c_farg6, c_farg7 817 }; 818 819 uint int_args = 0; 820 uint fp_args = 0; 821 uint stk_args = 0; // inc by 2 each time 822 823 for (int i = 0; i < total_args_passed; i++) { 824 switch (sig_bt[i]) { 825 case T_BOOLEAN: 826 case T_CHAR: 827 case T_BYTE: 828 case T_SHORT: 829 case T_INT: 830 if (int_args < Argument::n_int_register_parameters_c) { 831 regs[i].set1(INT_ArgReg[int_args++]->as_VMReg()); 832 } else { 833 #ifdef __APPLE__ 834 // Less-than word types are stored one after another. 835 // The code is unable to handle this so bailout. 836 return -1; 837 #endif 838 regs[i].set1(VMRegImpl::stack2reg(stk_args)); 839 stk_args += 2; 840 } 841 break; 842 case T_LONG: 843 assert((i + 1) < total_args_passed && sig_bt[i + 1] == T_VOID, "expecting half"); 844 // fall through 845 case T_OBJECT: 846 case T_ARRAY: 847 case T_ADDRESS: 848 case T_METADATA: 849 if (int_args < Argument::n_int_register_parameters_c) { 850 regs[i].set2(INT_ArgReg[int_args++]->as_VMReg()); 851 } else { 852 regs[i].set2(VMRegImpl::stack2reg(stk_args)); 853 stk_args += 2; 854 } 855 break; 856 case T_FLOAT: 857 if (fp_args < Argument::n_float_register_parameters_c) { 858 regs[i].set1(FP_ArgReg[fp_args++]->as_VMReg()); 859 } else { 860 #ifdef __APPLE__ 861 // Less-than word types are stored one after another. 862 // The code is unable to handle this so bailout. 863 return -1; 864 #endif 865 regs[i].set1(VMRegImpl::stack2reg(stk_args)); 866 stk_args += 2; 867 } 868 break; 869 case T_DOUBLE: 870 assert((i + 1) < total_args_passed && sig_bt[i + 1] == T_VOID, "expecting half"); 871 if (fp_args < Argument::n_float_register_parameters_c) { 872 regs[i].set2(FP_ArgReg[fp_args++]->as_VMReg()); 873 } else { 874 regs[i].set2(VMRegImpl::stack2reg(stk_args)); 875 stk_args += 2; 876 } 877 break; 878 case T_VOID: // Halves of longs and doubles 879 assert(i != 0 && (sig_bt[i - 1] == T_LONG || sig_bt[i - 1] == T_DOUBLE), "expecting half"); 880 regs[i].set_bad(); 881 break; 882 default: 883 ShouldNotReachHere(); 884 break; 885 } 886 } 887 888 return stk_args; 889 } 890 891 int SharedRuntime::vector_calling_convention(VMRegPair *regs, 892 uint num_bits, 893 uint total_args_passed) { 894 Unimplemented(); 895 return 0; 896 } 897 898 int SharedRuntime::c_calling_convention(const BasicType *sig_bt, 899 VMRegPair *regs, 900 VMRegPair *regs2, 901 int total_args_passed) 902 { 903 int result = c_calling_convention_priv(sig_bt, regs, regs2, total_args_passed); 904 guarantee(result >= 0, "Unsupported arguments configuration"); 905 return result; 906 } 907 908 909 void SharedRuntime::save_native_result(MacroAssembler *masm, BasicType ret_type, int frame_slots) { 910 // We always ignore the frame_slots arg and just use the space just below frame pointer 911 // which by this time is free to use 912 switch (ret_type) { 913 case T_FLOAT: 914 __ strs(v0, Address(rfp, -wordSize)); 915 break; 916 case T_DOUBLE: 917 __ strd(v0, Address(rfp, -wordSize)); 918 break; 919 case T_VOID: break; 920 default: { 921 __ str(r0, Address(rfp, -wordSize)); 922 } 923 } 924 } 925 926 void SharedRuntime::restore_native_result(MacroAssembler *masm, BasicType ret_type, int frame_slots) { 927 // We always ignore the frame_slots arg and just use the space just below frame pointer 928 // which by this time is free to use 929 switch (ret_type) { 930 case T_FLOAT: 931 __ ldrs(v0, Address(rfp, -wordSize)); 932 break; 933 case T_DOUBLE: 934 __ ldrd(v0, Address(rfp, -wordSize)); 935 break; 936 case T_VOID: break; 937 default: { 938 __ ldr(r0, Address(rfp, -wordSize)); 939 } 940 } 941 } 942 static void save_args(MacroAssembler *masm, int arg_count, int first_arg, VMRegPair *args) { 943 RegSet x; 944 for ( int i = first_arg ; i < arg_count ; i++ ) { 945 if (args[i].first()->is_Register()) { 946 x = x + args[i].first()->as_Register(); 947 } else if (args[i].first()->is_FloatRegister()) { 948 __ strd(args[i].first()->as_FloatRegister(), Address(__ pre(sp, -2 * wordSize))); 949 } 950 } 951 __ push(x, sp); 952 } 953 954 static void restore_args(MacroAssembler *masm, int arg_count, int first_arg, VMRegPair *args) { 955 RegSet x; 956 for ( int i = first_arg ; i < arg_count ; i++ ) { 957 if (args[i].first()->is_Register()) { 958 x = x + args[i].first()->as_Register(); 959 } else { 960 ; 961 } 962 } 963 __ pop(x, sp); 964 for ( int i = arg_count - 1 ; i >= first_arg ; i-- ) { 965 if (args[i].first()->is_Register()) { 966 ; 967 } else if (args[i].first()->is_FloatRegister()) { 968 __ ldrd(args[i].first()->as_FloatRegister(), Address(__ post(sp, 2 * wordSize))); 969 } 970 } 971 } 972 973 static void verify_oop_args(MacroAssembler* masm, 974 const methodHandle& method, 975 const BasicType* sig_bt, 976 const VMRegPair* regs) { 977 Register temp_reg = r19; // not part of any compiled calling seq 978 if (VerifyOops) { 979 for (int i = 0; i < method->size_of_parameters(); i++) { 980 if (sig_bt[i] == T_OBJECT || 981 sig_bt[i] == T_ARRAY) { 982 VMReg r = regs[i].first(); 983 assert(r->is_valid(), "bad oop arg"); 984 if (r->is_stack()) { 985 __ ldr(temp_reg, Address(sp, r->reg2stack() * VMRegImpl::stack_slot_size)); 986 __ verify_oop(temp_reg); 987 } else { 988 __ verify_oop(r->as_Register()); 989 } 990 } 991 } 992 } 993 } 994 995 // on exit, sp points to the ContinuationEntry 996 static OopMap* continuation_enter_setup(MacroAssembler* masm, int& stack_slots) { 997 assert(ContinuationEntry::size() % VMRegImpl::stack_slot_size == 0, ""); 998 assert(in_bytes(ContinuationEntry::cont_offset()) % VMRegImpl::stack_slot_size == 0, ""); 999 assert(in_bytes(ContinuationEntry::chunk_offset()) % VMRegImpl::stack_slot_size == 0, ""); 1000 1001 stack_slots += (int)ContinuationEntry::size()/wordSize; 1002 __ sub(sp, sp, (int)ContinuationEntry::size()); // place Continuation metadata 1003 1004 OopMap* map = new OopMap(((int)ContinuationEntry::size() + wordSize)/ VMRegImpl::stack_slot_size, 0 /* arg_slots*/); 1005 1006 __ ldr(rscratch1, Address(rthread, JavaThread::cont_entry_offset())); 1007 __ str(rscratch1, Address(sp, ContinuationEntry::parent_offset())); 1008 __ mov(rscratch1, sp); // we can't use sp as the source in str 1009 __ str(rscratch1, Address(rthread, JavaThread::cont_entry_offset())); 1010 1011 return map; 1012 } 1013 1014 // on entry c_rarg1 points to the continuation 1015 // sp points to ContinuationEntry 1016 // c_rarg3 -- isVirtualThread 1017 static void fill_continuation_entry(MacroAssembler* masm) { 1018 #ifdef ASSERT 1019 __ movw(rscratch1, ContinuationEntry::cookie_value()); 1020 __ strw(rscratch1, Address(sp, ContinuationEntry::cookie_offset())); 1021 #endif 1022 1023 __ str (c_rarg1, Address(sp, ContinuationEntry::cont_offset())); 1024 __ strw(c_rarg3, Address(sp, ContinuationEntry::flags_offset())); 1025 __ str (zr, Address(sp, ContinuationEntry::chunk_offset())); 1026 __ strw(zr, Address(sp, ContinuationEntry::argsize_offset())); 1027 __ strw(zr, Address(sp, ContinuationEntry::pin_count_offset())); 1028 1029 __ ldr(rscratch1, Address(rthread, JavaThread::cont_fastpath_offset())); 1030 __ str(rscratch1, Address(sp, ContinuationEntry::parent_cont_fastpath_offset())); 1031 __ ldr(rscratch1, Address(rthread, JavaThread::held_monitor_count_offset())); 1032 __ str(rscratch1, Address(sp, ContinuationEntry::parent_held_monitor_count_offset())); 1033 1034 __ str(zr, Address(rthread, JavaThread::cont_fastpath_offset())); 1035 __ str(zr, Address(rthread, JavaThread::held_monitor_count_offset())); 1036 } 1037 1038 // on entry, sp points to the ContinuationEntry 1039 // on exit, rfp points to the spilled rfp in the entry frame 1040 static void continuation_enter_cleanup(MacroAssembler* masm) { 1041 #ifndef PRODUCT 1042 Label OK; 1043 __ ldr(rscratch1, Address(rthread, JavaThread::cont_entry_offset())); 1044 __ cmp(sp, rscratch1); 1045 __ br(Assembler::EQ, OK); 1046 __ stop("incorrect sp1"); 1047 __ bind(OK); 1048 #endif 1049 1050 __ ldr(rscratch1, Address(sp, ContinuationEntry::parent_cont_fastpath_offset())); 1051 __ str(rscratch1, Address(rthread, JavaThread::cont_fastpath_offset())); 1052 __ ldr(rscratch1, Address(sp, ContinuationEntry::parent_held_monitor_count_offset())); 1053 __ str(rscratch1, Address(rthread, JavaThread::held_monitor_count_offset())); 1054 1055 __ ldr(rscratch2, Address(sp, ContinuationEntry::parent_offset())); 1056 __ str(rscratch2, Address(rthread, JavaThread::cont_entry_offset())); 1057 __ add(rfp, sp, (int)ContinuationEntry::size()); 1058 } 1059 1060 // enterSpecial(Continuation c, boolean isContinue, boolean isVirtualThread) 1061 // On entry: c_rarg1 -- the continuation object 1062 // c_rarg2 -- isContinue 1063 // c_rarg3 -- isVirtualThread 1064 static void gen_continuation_enter(MacroAssembler* masm, 1065 const methodHandle& method, 1066 const BasicType* sig_bt, 1067 const VMRegPair* regs, 1068 int& exception_offset, 1069 OopMapSet*oop_maps, 1070 int& frame_complete, 1071 int& stack_slots, 1072 int& interpreted_entry_offset, 1073 int& compiled_entry_offset) { 1074 //verify_oop_args(masm, method, sig_bt, regs); 1075 Address resolve(SharedRuntime::get_resolve_static_call_stub(), relocInfo::static_call_type); 1076 1077 address start = __ pc(); 1078 1079 Label call_thaw, exit; 1080 1081 // i2i entry used at interp_only_mode only 1082 interpreted_entry_offset = __ pc() - start; 1083 { 1084 1085 #ifdef ASSERT 1086 Label is_interp_only; 1087 __ ldrw(rscratch1, Address(rthread, JavaThread::interp_only_mode_offset())); 1088 __ cbnzw(rscratch1, is_interp_only); 1089 __ stop("enterSpecial interpreter entry called when not in interp_only_mode"); 1090 __ bind(is_interp_only); 1091 #endif 1092 1093 // Read interpreter arguments into registers (this is an ad-hoc i2c adapter) 1094 __ ldr(c_rarg1, Address(esp, Interpreter::stackElementSize*2)); 1095 __ ldr(c_rarg2, Address(esp, Interpreter::stackElementSize*1)); 1096 __ ldr(c_rarg3, Address(esp, Interpreter::stackElementSize*0)); 1097 __ push_cont_fastpath(rthread); 1098 1099 __ enter(); 1100 stack_slots = 2; // will be adjusted in setup 1101 OopMap* map = continuation_enter_setup(masm, stack_slots); 1102 // The frame is complete here, but we only record it for the compiled entry, so the frame would appear unsafe, 1103 // but that's okay because at the very worst we'll miss an async sample, but we're in interp_only_mode anyway. 1104 1105 fill_continuation_entry(masm); 1106 1107 __ cbnz(c_rarg2, call_thaw); 1108 1109 const address tr_call = __ trampoline_call(resolve); 1110 if (tr_call == nullptr) { 1111 fatal("CodeCache is full at gen_continuation_enter"); 1112 } 1113 1114 oop_maps->add_gc_map(__ pc() - start, map); 1115 __ post_call_nop(); 1116 1117 __ b(exit); 1118 1119 CodeBuffer* cbuf = masm->code_section()->outer(); 1120 address stub = CompiledStaticCall::emit_to_interp_stub(*cbuf, tr_call); 1121 if (stub == nullptr) { 1122 fatal("CodeCache is full at gen_continuation_enter"); 1123 } 1124 } 1125 1126 // compiled entry 1127 __ align(CodeEntryAlignment); 1128 compiled_entry_offset = __ pc() - start; 1129 1130 __ enter(); 1131 stack_slots = 2; // will be adjusted in setup 1132 OopMap* map = continuation_enter_setup(masm, stack_slots); 1133 frame_complete = __ pc() - start; 1134 1135 fill_continuation_entry(masm); 1136 1137 __ cbnz(c_rarg2, call_thaw); 1138 1139 const address tr_call = __ trampoline_call(resolve); 1140 if (tr_call == nullptr) { 1141 fatal("CodeCache is full at gen_continuation_enter"); 1142 } 1143 1144 oop_maps->add_gc_map(__ pc() - start, map); 1145 __ post_call_nop(); 1146 1147 __ b(exit); 1148 1149 __ bind(call_thaw); 1150 1151 __ rt_call(CAST_FROM_FN_PTR(address, StubRoutines::cont_thaw())); 1152 oop_maps->add_gc_map(__ pc() - start, map->deep_copy()); 1153 ContinuationEntry::_return_pc_offset = __ pc() - start; 1154 __ post_call_nop(); 1155 1156 __ bind(exit); 1157 continuation_enter_cleanup(masm); 1158 __ leave(); 1159 __ ret(lr); 1160 1161 /// exception handling 1162 1163 exception_offset = __ pc() - start; 1164 { 1165 __ mov(r19, r0); // save return value contaning the exception oop in callee-saved R19 1166 1167 continuation_enter_cleanup(masm); 1168 1169 __ ldr(c_rarg1, Address(rfp, wordSize)); // return address 1170 __ call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::exception_handler_for_return_address), rthread, c_rarg1); 1171 1172 // see OptoRuntime::generate_exception_blob: r0 -- exception oop, r3 -- exception pc 1173 1174 __ mov(r1, r0); // the exception handler 1175 __ mov(r0, r19); // restore return value contaning the exception oop 1176 __ verify_oop(r0); 1177 1178 __ leave(); 1179 __ mov(r3, lr); 1180 __ br(r1); // the exception handler 1181 } 1182 1183 CodeBuffer* cbuf = masm->code_section()->outer(); 1184 address stub = CompiledStaticCall::emit_to_interp_stub(*cbuf, tr_call); 1185 if (stub == nullptr) { 1186 fatal("CodeCache is full at gen_continuation_enter"); 1187 } 1188 } 1189 1190 static void gen_continuation_yield(MacroAssembler* masm, 1191 const methodHandle& method, 1192 const BasicType* sig_bt, 1193 const VMRegPair* regs, 1194 OopMapSet* oop_maps, 1195 int& frame_complete, 1196 int& stack_slots, 1197 int& compiled_entry_offset) { 1198 enum layout { 1199 rfp_off1, 1200 rfp_off2, 1201 lr_off, 1202 lr_off2, 1203 framesize // inclusive of return address 1204 }; 1205 // assert(is_even(framesize/2), "sp not 16-byte aligned"); 1206 stack_slots = framesize / VMRegImpl::slots_per_word; 1207 assert(stack_slots == 2, "recheck layout"); 1208 1209 address start = __ pc(); 1210 1211 compiled_entry_offset = __ pc() - start; 1212 __ enter(); 1213 1214 __ mov(c_rarg1, sp); 1215 1216 frame_complete = __ pc() - start; 1217 address the_pc = __ pc(); 1218 1219 __ post_call_nop(); // this must be exactly after the pc value that is pushed into the frame info, we use this nop for fast CodeBlob lookup 1220 1221 __ mov(c_rarg0, rthread); 1222 __ set_last_Java_frame(sp, rfp, the_pc, rscratch1); 1223 __ call_VM_leaf(Continuation::freeze_entry(), 2); 1224 __ reset_last_Java_frame(true); 1225 1226 Label pinned; 1227 1228 __ cbnz(r0, pinned); 1229 1230 // We've succeeded, set sp to the ContinuationEntry 1231 __ ldr(rscratch1, Address(rthread, JavaThread::cont_entry_offset())); 1232 __ mov(sp, rscratch1); 1233 continuation_enter_cleanup(masm); 1234 1235 __ bind(pinned); // pinned -- return to caller 1236 1237 // handle pending exception thrown by freeze 1238 __ ldr(rscratch1, Address(rthread, in_bytes(Thread::pending_exception_offset()))); 1239 Label ok; 1240 __ cbz(rscratch1, ok); 1241 __ leave(); 1242 __ lea(rscratch1, RuntimeAddress(StubRoutines::forward_exception_entry())); 1243 __ br(rscratch1); 1244 __ bind(ok); 1245 1246 __ leave(); 1247 __ ret(lr); 1248 1249 OopMap* map = new OopMap(framesize, 1); 1250 oop_maps->add_gc_map(the_pc - start, map); 1251 } 1252 1253 static void gen_special_dispatch(MacroAssembler* masm, 1254 const methodHandle& method, 1255 const BasicType* sig_bt, 1256 const VMRegPair* regs) { 1257 verify_oop_args(masm, method, sig_bt, regs); 1258 vmIntrinsics::ID iid = method->intrinsic_id(); 1259 1260 // Now write the args into the outgoing interpreter space 1261 bool has_receiver = false; 1262 Register receiver_reg = noreg; 1263 int member_arg_pos = -1; 1264 Register member_reg = noreg; 1265 int ref_kind = MethodHandles::signature_polymorphic_intrinsic_ref_kind(iid); 1266 if (ref_kind != 0) { 1267 member_arg_pos = method->size_of_parameters() - 1; // trailing MemberName argument 1268 member_reg = r19; // known to be free at this point 1269 has_receiver = MethodHandles::ref_kind_has_receiver(ref_kind); 1270 } else if (iid == vmIntrinsics::_invokeBasic) { 1271 has_receiver = true; 1272 } else if (iid == vmIntrinsics::_linkToNative) { 1273 member_arg_pos = method->size_of_parameters() - 1; // trailing NativeEntryPoint argument 1274 member_reg = r19; // known to be free at this point 1275 } else { 1276 fatal("unexpected intrinsic id %d", vmIntrinsics::as_int(iid)); 1277 } 1278 1279 if (member_reg != noreg) { 1280 // Load the member_arg into register, if necessary. 1281 SharedRuntime::check_member_name_argument_is_last_argument(method, sig_bt, regs); 1282 VMReg r = regs[member_arg_pos].first(); 1283 if (r->is_stack()) { 1284 __ ldr(member_reg, Address(sp, r->reg2stack() * VMRegImpl::stack_slot_size)); 1285 } else { 1286 // no data motion is needed 1287 member_reg = r->as_Register(); 1288 } 1289 } 1290 1291 if (has_receiver) { 1292 // Make sure the receiver is loaded into a register. 1293 assert(method->size_of_parameters() > 0, "oob"); 1294 assert(sig_bt[0] == T_OBJECT, "receiver argument must be an object"); 1295 VMReg r = regs[0].first(); 1296 assert(r->is_valid(), "bad receiver arg"); 1297 if (r->is_stack()) { 1298 // Porting note: This assumes that compiled calling conventions always 1299 // pass the receiver oop in a register. If this is not true on some 1300 // platform, pick a temp and load the receiver from stack. 1301 fatal("receiver always in a register"); 1302 receiver_reg = r2; // known to be free at this point 1303 __ ldr(receiver_reg, Address(sp, r->reg2stack() * VMRegImpl::stack_slot_size)); 1304 } else { 1305 // no data motion is needed 1306 receiver_reg = r->as_Register(); 1307 } 1308 } 1309 1310 // Figure out which address we are really jumping to: 1311 MethodHandles::generate_method_handle_dispatch(masm, iid, 1312 receiver_reg, member_reg, /*for_compiler_entry:*/ true); 1313 } 1314 1315 // --------------------------------------------------------------------------- 1316 // Generate a native wrapper for a given method. The method takes arguments 1317 // in the Java compiled code convention, marshals them to the native 1318 // convention (handlizes oops, etc), transitions to native, makes the call, 1319 // returns to java state (possibly blocking), unhandlizes any result and 1320 // returns. 1321 // 1322 // Critical native functions are a shorthand for the use of 1323 // GetPrimtiveArrayCritical and disallow the use of any other JNI 1324 // functions. The wrapper is expected to unpack the arguments before 1325 // passing them to the callee. Critical native functions leave the state _in_Java, 1326 // since they block out GC. 1327 // Some other parts of JNI setup are skipped like the tear down of the JNI handle 1328 // block and the check for pending exceptions it's impossible for them 1329 // to be thrown. 1330 // 1331 nmethod* SharedRuntime::generate_native_wrapper(MacroAssembler* masm, 1332 const methodHandle& method, 1333 int compile_id, 1334 BasicType* in_sig_bt, 1335 VMRegPair* in_regs, 1336 BasicType ret_type) { 1337 if (method->is_continuation_native_intrinsic()) { 1338 int exception_offset = -1; 1339 OopMapSet* oop_maps = new OopMapSet(); 1340 int frame_complete = -1; 1341 int stack_slots = -1; 1342 int interpreted_entry_offset = -1; 1343 int vep_offset = -1; 1344 if (method->is_continuation_enter_intrinsic()) { 1345 gen_continuation_enter(masm, 1346 method, 1347 in_sig_bt, 1348 in_regs, 1349 exception_offset, 1350 oop_maps, 1351 frame_complete, 1352 stack_slots, 1353 interpreted_entry_offset, 1354 vep_offset); 1355 } else if (method->is_continuation_yield_intrinsic()) { 1356 gen_continuation_yield(masm, 1357 method, 1358 in_sig_bt, 1359 in_regs, 1360 oop_maps, 1361 frame_complete, 1362 stack_slots, 1363 vep_offset); 1364 } else { 1365 guarantee(false, "Unknown Continuation native intrinsic"); 1366 } 1367 1368 #ifdef ASSERT 1369 if (method->is_continuation_enter_intrinsic()) { 1370 assert(interpreted_entry_offset != -1, "Must be set"); 1371 assert(exception_offset != -1, "Must be set"); 1372 } else { 1373 assert(interpreted_entry_offset == -1, "Must be unset"); 1374 assert(exception_offset == -1, "Must be unset"); 1375 } 1376 assert(frame_complete != -1, "Must be set"); 1377 assert(stack_slots != -1, "Must be set"); 1378 assert(vep_offset != -1, "Must be set"); 1379 #endif 1380 1381 __ flush(); 1382 nmethod* nm = nmethod::new_native_nmethod(method, 1383 compile_id, 1384 masm->code(), 1385 vep_offset, 1386 frame_complete, 1387 stack_slots, 1388 in_ByteSize(-1), 1389 in_ByteSize(-1), 1390 oop_maps, 1391 exception_offset); 1392 if (method->is_continuation_enter_intrinsic()) { 1393 ContinuationEntry::set_enter_code(nm, interpreted_entry_offset); 1394 } else if (method->is_continuation_yield_intrinsic()) { 1395 _cont_doYield_stub = nm; 1396 } else { 1397 guarantee(false, "Unknown Continuation native intrinsic"); 1398 } 1399 return nm; 1400 } 1401 1402 if (method->is_method_handle_intrinsic()) { 1403 vmIntrinsics::ID iid = method->intrinsic_id(); 1404 intptr_t start = (intptr_t)__ pc(); 1405 int vep_offset = ((intptr_t)__ pc()) - start; 1406 1407 // First instruction must be a nop as it may need to be patched on deoptimisation 1408 __ nop(); 1409 gen_special_dispatch(masm, 1410 method, 1411 in_sig_bt, 1412 in_regs); 1413 int frame_complete = ((intptr_t)__ pc()) - start; // not complete, period 1414 __ flush(); 1415 int stack_slots = SharedRuntime::out_preserve_stack_slots(); // no out slots at all, actually 1416 return nmethod::new_native_nmethod(method, 1417 compile_id, 1418 masm->code(), 1419 vep_offset, 1420 frame_complete, 1421 stack_slots / VMRegImpl::slots_per_word, 1422 in_ByteSize(-1), 1423 in_ByteSize(-1), 1424 nullptr); 1425 } 1426 address native_func = method->native_function(); 1427 assert(native_func != nullptr, "must have function"); 1428 1429 // An OopMap for lock (and class if static) 1430 OopMapSet *oop_maps = new OopMapSet(); 1431 intptr_t start = (intptr_t)__ pc(); 1432 1433 // We have received a description of where all the java arg are located 1434 // on entry to the wrapper. We need to convert these args to where 1435 // the jni function will expect them. To figure out where they go 1436 // we convert the java signature to a C signature by inserting 1437 // the hidden arguments as arg[0] and possibly arg[1] (static method) 1438 1439 const int total_in_args = method->size_of_parameters(); 1440 int total_c_args = total_in_args + (method->is_static() ? 2 : 1); 1441 1442 BasicType* out_sig_bt = NEW_RESOURCE_ARRAY(BasicType, total_c_args); 1443 VMRegPair* out_regs = NEW_RESOURCE_ARRAY(VMRegPair, total_c_args); 1444 BasicType* in_elem_bt = nullptr; 1445 1446 int argc = 0; 1447 out_sig_bt[argc++] = T_ADDRESS; 1448 if (method->is_static()) { 1449 out_sig_bt[argc++] = T_OBJECT; 1450 } 1451 1452 for (int i = 0; i < total_in_args ; i++ ) { 1453 out_sig_bt[argc++] = in_sig_bt[i]; 1454 } 1455 1456 // Now figure out where the args must be stored and how much stack space 1457 // they require. 1458 int out_arg_slots; 1459 out_arg_slots = c_calling_convention_priv(out_sig_bt, out_regs, nullptr, total_c_args); 1460 1461 if (out_arg_slots < 0) { 1462 return nullptr; 1463 } 1464 1465 // Compute framesize for the wrapper. We need to handlize all oops in 1466 // incoming registers 1467 1468 // Calculate the total number of stack slots we will need. 1469 1470 // First count the abi requirement plus all of the outgoing args 1471 int stack_slots = SharedRuntime::out_preserve_stack_slots() + out_arg_slots; 1472 1473 // Now the space for the inbound oop handle area 1474 int total_save_slots = 8 * VMRegImpl::slots_per_word; // 8 arguments passed in registers 1475 1476 int oop_handle_offset = stack_slots; 1477 stack_slots += total_save_slots; 1478 1479 // Now any space we need for handlizing a klass if static method 1480 1481 int klass_slot_offset = 0; 1482 int klass_offset = -1; 1483 int lock_slot_offset = 0; 1484 bool is_static = false; 1485 1486 if (method->is_static()) { 1487 klass_slot_offset = stack_slots; 1488 stack_slots += VMRegImpl::slots_per_word; 1489 klass_offset = klass_slot_offset * VMRegImpl::stack_slot_size; 1490 is_static = true; 1491 } 1492 1493 // Plus a lock if needed 1494 1495 if (method->is_synchronized()) { 1496 lock_slot_offset = stack_slots; 1497 stack_slots += VMRegImpl::slots_per_word; 1498 } 1499 1500 // Now a place (+2) to save return values or temp during shuffling 1501 // + 4 for return address (which we own) and saved rfp 1502 stack_slots += 6; 1503 1504 // Ok The space we have allocated will look like: 1505 // 1506 // 1507 // FP-> | | 1508 // |---------------------| 1509 // | 2 slots for moves | 1510 // |---------------------| 1511 // | lock box (if sync) | 1512 // |---------------------| <- lock_slot_offset 1513 // | klass (if static) | 1514 // |---------------------| <- klass_slot_offset 1515 // | oopHandle area | 1516 // |---------------------| <- oop_handle_offset (8 java arg registers) 1517 // | outbound memory | 1518 // | based arguments | 1519 // | | 1520 // |---------------------| 1521 // | | 1522 // SP-> | out_preserved_slots | 1523 // 1524 // 1525 1526 1527 // Now compute actual number of stack words we need rounding to make 1528 // stack properly aligned. 1529 stack_slots = align_up(stack_slots, StackAlignmentInSlots); 1530 1531 int stack_size = stack_slots * VMRegImpl::stack_slot_size; 1532 1533 // First thing make an ic check to see if we should even be here 1534 1535 // We are free to use all registers as temps without saving them and 1536 // restoring them except rfp. rfp is the only callee save register 1537 // as far as the interpreter and the compiler(s) are concerned. 1538 1539 1540 const Register ic_reg = rscratch2; 1541 const Register receiver = j_rarg0; 1542 1543 Label hit; 1544 Label exception_pending; 1545 1546 assert_different_registers(ic_reg, receiver, rscratch1); 1547 __ verify_oop(receiver); 1548 __ cmp_klass(receiver, ic_reg, rscratch1); 1549 __ br(Assembler::EQ, hit); 1550 1551 __ far_jump(RuntimeAddress(SharedRuntime::get_ic_miss_stub())); 1552 1553 // Verified entry point must be aligned 1554 __ align(8); 1555 1556 __ bind(hit); 1557 1558 int vep_offset = ((intptr_t)__ pc()) - start; 1559 1560 // If we have to make this method not-entrant we'll overwrite its 1561 // first instruction with a jump. For this action to be legal we 1562 // must ensure that this first instruction is a B, BL, NOP, BKPT, 1563 // SVC, HVC, or SMC. Make it a NOP. 1564 __ nop(); 1565 1566 if (VM_Version::supports_fast_class_init_checks() && method->needs_clinit_barrier()) { 1567 Label L_skip_barrier; 1568 __ mov_metadata(rscratch2, method->method_holder()); // InstanceKlass* 1569 __ clinit_barrier(rscratch2, rscratch1, &L_skip_barrier); 1570 __ far_jump(RuntimeAddress(SharedRuntime::get_handle_wrong_method_stub())); 1571 1572 __ bind(L_skip_barrier); 1573 } 1574 1575 // Generate stack overflow check 1576 __ bang_stack_with_offset(checked_cast<int>(StackOverflow::stack_shadow_zone_size())); 1577 1578 // Generate a new frame for the wrapper. 1579 __ enter(); 1580 // -2 because return address is already present and so is saved rfp 1581 __ sub(sp, sp, stack_size - 2*wordSize); 1582 1583 BarrierSetAssembler* bs = BarrierSet::barrier_set()->barrier_set_assembler(); 1584 bs->nmethod_entry_barrier(masm, nullptr /* slow_path */, nullptr /* continuation */, nullptr /* guard */); 1585 1586 // Frame is now completed as far as size and linkage. 1587 int frame_complete = ((intptr_t)__ pc()) - start; 1588 1589 // We use r20 as the oop handle for the receiver/klass 1590 // It is callee save so it survives the call to native 1591 1592 const Register oop_handle_reg = r20; 1593 1594 // 1595 // We immediately shuffle the arguments so that any vm call we have to 1596 // make from here on out (sync slow path, jvmti, etc.) we will have 1597 // captured the oops from our caller and have a valid oopMap for 1598 // them. 1599 1600 // ----------------- 1601 // The Grand Shuffle 1602 1603 // The Java calling convention is either equal (linux) or denser (win64) than the 1604 // c calling convention. However the because of the jni_env argument the c calling 1605 // convention always has at least one more (and two for static) arguments than Java. 1606 // Therefore if we move the args from java -> c backwards then we will never have 1607 // a register->register conflict and we don't have to build a dependency graph 1608 // and figure out how to break any cycles. 1609 // 1610 1611 // Record esp-based slot for receiver on stack for non-static methods 1612 int receiver_offset = -1; 1613 1614 // This is a trick. We double the stack slots so we can claim 1615 // the oops in the caller's frame. Since we are sure to have 1616 // more args than the caller doubling is enough to make 1617 // sure we can capture all the incoming oop args from the 1618 // caller. 1619 // 1620 OopMap* map = new OopMap(stack_slots * 2, 0 /* arg_slots*/); 1621 1622 // Mark location of rfp (someday) 1623 // map->set_callee_saved(VMRegImpl::stack2reg( stack_slots - 2), stack_slots * 2, 0, vmreg(rfp)); 1624 1625 1626 int float_args = 0; 1627 int int_args = 0; 1628 1629 #ifdef ASSERT 1630 bool reg_destroyed[Register::number_of_registers]; 1631 bool freg_destroyed[FloatRegister::number_of_registers]; 1632 for ( int r = 0 ; r < Register::number_of_registers ; r++ ) { 1633 reg_destroyed[r] = false; 1634 } 1635 for ( int f = 0 ; f < FloatRegister::number_of_registers ; f++ ) { 1636 freg_destroyed[f] = false; 1637 } 1638 1639 #endif /* ASSERT */ 1640 1641 // For JNI natives the incoming and outgoing registers are offset upwards. 1642 GrowableArray<int> arg_order(2 * total_in_args); 1643 VMRegPair tmp_vmreg; 1644 tmp_vmreg.set2(r19->as_VMReg()); 1645 1646 for (int i = total_in_args - 1, c_arg = total_c_args - 1; i >= 0; i--, c_arg--) { 1647 arg_order.push(i); 1648 arg_order.push(c_arg); 1649 } 1650 1651 int temploc = -1; 1652 for (int ai = 0; ai < arg_order.length(); ai += 2) { 1653 int i = arg_order.at(ai); 1654 int c_arg = arg_order.at(ai + 1); 1655 __ block_comment(err_msg("move %d -> %d", i, c_arg)); 1656 assert(c_arg != -1 && i != -1, "wrong order"); 1657 #ifdef ASSERT 1658 if (in_regs[i].first()->is_Register()) { 1659 assert(!reg_destroyed[in_regs[i].first()->as_Register()->encoding()], "destroyed reg!"); 1660 } else if (in_regs[i].first()->is_FloatRegister()) { 1661 assert(!freg_destroyed[in_regs[i].first()->as_FloatRegister()->encoding()], "destroyed reg!"); 1662 } 1663 if (out_regs[c_arg].first()->is_Register()) { 1664 reg_destroyed[out_regs[c_arg].first()->as_Register()->encoding()] = true; 1665 } else if (out_regs[c_arg].first()->is_FloatRegister()) { 1666 freg_destroyed[out_regs[c_arg].first()->as_FloatRegister()->encoding()] = true; 1667 } 1668 #endif /* ASSERT */ 1669 switch (in_sig_bt[i]) { 1670 case T_ARRAY: 1671 case T_OBJECT: 1672 __ object_move(map, oop_handle_offset, stack_slots, in_regs[i], out_regs[c_arg], 1673 ((i == 0) && (!is_static)), 1674 &receiver_offset); 1675 int_args++; 1676 break; 1677 case T_VOID: 1678 break; 1679 1680 case T_FLOAT: 1681 __ float_move(in_regs[i], out_regs[c_arg]); 1682 float_args++; 1683 break; 1684 1685 case T_DOUBLE: 1686 assert( i + 1 < total_in_args && 1687 in_sig_bt[i + 1] == T_VOID && 1688 out_sig_bt[c_arg+1] == T_VOID, "bad arg list"); 1689 __ double_move(in_regs[i], out_regs[c_arg]); 1690 float_args++; 1691 break; 1692 1693 case T_LONG : 1694 __ long_move(in_regs[i], out_regs[c_arg]); 1695 int_args++; 1696 break; 1697 1698 case T_ADDRESS: assert(false, "found T_ADDRESS in java args"); 1699 1700 default: 1701 __ move32_64(in_regs[i], out_regs[c_arg]); 1702 int_args++; 1703 } 1704 } 1705 1706 // point c_arg at the first arg that is already loaded in case we 1707 // need to spill before we call out 1708 int c_arg = total_c_args - total_in_args; 1709 1710 // Pre-load a static method's oop into c_rarg1. 1711 if (method->is_static()) { 1712 1713 // load oop into a register 1714 __ movoop(c_rarg1, 1715 JNIHandles::make_local(method->method_holder()->java_mirror())); 1716 1717 // Now handlize the static class mirror it's known not-null. 1718 __ str(c_rarg1, Address(sp, klass_offset)); 1719 map->set_oop(VMRegImpl::stack2reg(klass_slot_offset)); 1720 1721 // Now get the handle 1722 __ lea(c_rarg1, Address(sp, klass_offset)); 1723 // and protect the arg if we must spill 1724 c_arg--; 1725 } 1726 1727 // Change state to native (we save the return address in the thread, since it might not 1728 // be pushed on the stack when we do a stack traversal). 1729 // We use the same pc/oopMap repeatedly when we call out 1730 1731 Label native_return; 1732 __ set_last_Java_frame(sp, noreg, native_return, rscratch1); 1733 1734 Label dtrace_method_entry, dtrace_method_entry_done; 1735 { 1736 uint64_t offset; 1737 __ adrp(rscratch1, ExternalAddress((address)&DTraceMethodProbes), offset); 1738 __ ldrb(rscratch1, Address(rscratch1, offset)); 1739 __ cbnzw(rscratch1, dtrace_method_entry); 1740 __ bind(dtrace_method_entry_done); 1741 } 1742 1743 // RedefineClasses() tracing support for obsolete method entry 1744 if (log_is_enabled(Trace, redefine, class, obsolete)) { 1745 // protect the args we've loaded 1746 save_args(masm, total_c_args, c_arg, out_regs); 1747 __ mov_metadata(c_rarg1, method()); 1748 __ call_VM_leaf( 1749 CAST_FROM_FN_PTR(address, SharedRuntime::rc_trace_method_entry), 1750 rthread, c_rarg1); 1751 restore_args(masm, total_c_args, c_arg, out_regs); 1752 } 1753 1754 // Lock a synchronized method 1755 1756 // Register definitions used by locking and unlocking 1757 1758 const Register swap_reg = r0; 1759 const Register obj_reg = r19; // Will contain the oop 1760 const Register lock_reg = r13; // Address of compiler lock object (BasicLock) 1761 const Register old_hdr = r13; // value of old header at unlock time 1762 const Register lock_tmp = r14; // Temporary used by lightweight_lock/unlock 1763 const Register tmp = lr; 1764 1765 Label slow_path_lock; 1766 Label lock_done; 1767 1768 if (method->is_synchronized()) { 1769 Label count; 1770 const int mark_word_offset = BasicLock::displaced_header_offset_in_bytes(); 1771 1772 // Get the handle (the 2nd argument) 1773 __ mov(oop_handle_reg, c_rarg1); 1774 1775 // Get address of the box 1776 1777 __ lea(lock_reg, Address(sp, lock_slot_offset * VMRegImpl::stack_slot_size)); 1778 1779 // Load the oop from the handle 1780 __ ldr(obj_reg, Address(oop_handle_reg, 0)); 1781 1782 if (LockingMode == LM_MONITOR) { 1783 __ b(slow_path_lock); 1784 } else if (LockingMode == LM_LEGACY) { 1785 // Load (object->mark() | 1) into swap_reg %r0 1786 __ ldr(rscratch1, Address(obj_reg, oopDesc::mark_offset_in_bytes())); 1787 __ orr(swap_reg, rscratch1, 1); 1788 1789 // Save (object->mark() | 1) into BasicLock's displaced header 1790 __ str(swap_reg, Address(lock_reg, mark_word_offset)); 1791 1792 // src -> dest iff dest == r0 else r0 <- dest 1793 __ cmpxchg_obj_header(r0, lock_reg, obj_reg, rscratch1, count, /*fallthrough*/nullptr); 1794 1795 // Hmm should this move to the slow path code area??? 1796 1797 // Test if the oopMark is an obvious stack pointer, i.e., 1798 // 1) (mark & 3) == 0, and 1799 // 2) sp <= mark < mark + os::pagesize() 1800 // These 3 tests can be done by evaluating the following 1801 // expression: ((mark - sp) & (3 - os::vm_page_size())), 1802 // assuming both stack pointer and pagesize have their 1803 // least significant 2 bits clear. 1804 // NOTE: the oopMark is in swap_reg %r0 as the result of cmpxchg 1805 1806 __ sub(swap_reg, sp, swap_reg); 1807 __ neg(swap_reg, swap_reg); 1808 __ ands(swap_reg, swap_reg, 3 - (int)os::vm_page_size()); 1809 1810 // Save the test result, for recursive case, the result is zero 1811 __ str(swap_reg, Address(lock_reg, mark_word_offset)); 1812 __ br(Assembler::NE, slow_path_lock); 1813 } else { 1814 assert(LockingMode == LM_LIGHTWEIGHT, "must be"); 1815 __ ldr(swap_reg, Address(obj_reg, oopDesc::mark_offset_in_bytes())); 1816 __ lightweight_lock(obj_reg, swap_reg, tmp, lock_tmp, slow_path_lock); 1817 } 1818 __ bind(count); 1819 __ increment(Address(rthread, JavaThread::held_monitor_count_offset())); 1820 1821 // Slow path will re-enter here 1822 __ bind(lock_done); 1823 } 1824 1825 1826 // Finally just about ready to make the JNI call 1827 1828 // get JNIEnv* which is first argument to native 1829 __ lea(c_rarg0, Address(rthread, in_bytes(JavaThread::jni_environment_offset()))); 1830 1831 // Now set thread in native 1832 __ mov(rscratch1, _thread_in_native); 1833 __ lea(rscratch2, Address(rthread, JavaThread::thread_state_offset())); 1834 __ stlrw(rscratch1, rscratch2); 1835 1836 __ rt_call(native_func); 1837 1838 __ bind(native_return); 1839 1840 intptr_t return_pc = (intptr_t) __ pc(); 1841 oop_maps->add_gc_map(return_pc - start, map); 1842 1843 // Unpack native results. 1844 switch (ret_type) { 1845 case T_BOOLEAN: __ c2bool(r0); break; 1846 case T_CHAR : __ ubfx(r0, r0, 0, 16); break; 1847 case T_BYTE : __ sbfx(r0, r0, 0, 8); break; 1848 case T_SHORT : __ sbfx(r0, r0, 0, 16); break; 1849 case T_INT : __ sbfx(r0, r0, 0, 32); break; 1850 case T_DOUBLE : 1851 case T_FLOAT : 1852 // Result is in v0 we'll save as needed 1853 break; 1854 case T_ARRAY: // Really a handle 1855 case T_OBJECT: // Really a handle 1856 break; // can't de-handlize until after safepoint check 1857 case T_VOID: break; 1858 case T_LONG: break; 1859 default : ShouldNotReachHere(); 1860 } 1861 1862 Label safepoint_in_progress, safepoint_in_progress_done; 1863 Label after_transition; 1864 1865 // Switch thread to "native transition" state before reading the synchronization state. 1866 // This additional state is necessary because reading and testing the synchronization 1867 // state is not atomic w.r.t. GC, as this scenario demonstrates: 1868 // Java thread A, in _thread_in_native state, loads _not_synchronized and is preempted. 1869 // VM thread changes sync state to synchronizing and suspends threads for GC. 1870 // Thread A is resumed to finish this native method, but doesn't block here since it 1871 // didn't see any synchronization is progress, and escapes. 1872 __ mov(rscratch1, _thread_in_native_trans); 1873 1874 __ strw(rscratch1, Address(rthread, JavaThread::thread_state_offset())); 1875 1876 // Force this write out before the read below 1877 if (!UseSystemMemoryBarrier) { 1878 __ dmb(Assembler::ISH); 1879 } 1880 1881 __ verify_sve_vector_length(); 1882 1883 // Check for safepoint operation in progress and/or pending suspend requests. 1884 { 1885 // We need an acquire here to ensure that any subsequent load of the 1886 // global SafepointSynchronize::_state flag is ordered after this load 1887 // of the thread-local polling word. We don't want this poll to 1888 // return false (i.e. not safepointing) and a later poll of the global 1889 // SafepointSynchronize::_state spuriously to return true. 1890 // 1891 // This is to avoid a race when we're in a native->Java transition 1892 // racing the code which wakes up from a safepoint. 1893 1894 __ safepoint_poll(safepoint_in_progress, true /* at_return */, true /* acquire */, false /* in_nmethod */); 1895 __ ldrw(rscratch1, Address(rthread, JavaThread::suspend_flags_offset())); 1896 __ cbnzw(rscratch1, safepoint_in_progress); 1897 __ bind(safepoint_in_progress_done); 1898 } 1899 1900 // change thread state 1901 __ mov(rscratch1, _thread_in_Java); 1902 __ lea(rscratch2, Address(rthread, JavaThread::thread_state_offset())); 1903 __ stlrw(rscratch1, rscratch2); 1904 __ bind(after_transition); 1905 1906 Label reguard; 1907 Label reguard_done; 1908 __ ldrb(rscratch1, Address(rthread, JavaThread::stack_guard_state_offset())); 1909 __ cmpw(rscratch1, StackOverflow::stack_guard_yellow_reserved_disabled); 1910 __ br(Assembler::EQ, reguard); 1911 __ bind(reguard_done); 1912 1913 // native result if any is live 1914 1915 // Unlock 1916 Label unlock_done; 1917 Label slow_path_unlock; 1918 if (method->is_synchronized()) { 1919 1920 // Get locked oop from the handle we passed to jni 1921 __ ldr(obj_reg, Address(oop_handle_reg, 0)); 1922 1923 Label done, not_recursive; 1924 1925 if (LockingMode == LM_LEGACY) { 1926 // Simple recursive lock? 1927 __ ldr(rscratch1, Address(sp, lock_slot_offset * VMRegImpl::stack_slot_size)); 1928 __ cbnz(rscratch1, not_recursive); 1929 __ decrement(Address(rthread, JavaThread::held_monitor_count_offset())); 1930 __ b(done); 1931 } 1932 1933 __ bind(not_recursive); 1934 1935 // Must save r0 if if it is live now because cmpxchg must use it 1936 if (ret_type != T_FLOAT && ret_type != T_DOUBLE && ret_type != T_VOID) { 1937 save_native_result(masm, ret_type, stack_slots); 1938 } 1939 1940 if (LockingMode == LM_MONITOR) { 1941 __ b(slow_path_unlock); 1942 } else if (LockingMode == LM_LEGACY) { 1943 // get address of the stack lock 1944 __ lea(r0, Address(sp, lock_slot_offset * VMRegImpl::stack_slot_size)); 1945 // get old displaced header 1946 __ ldr(old_hdr, Address(r0, 0)); 1947 1948 // Atomic swap old header if oop still contains the stack lock 1949 Label count; 1950 __ cmpxchg_obj_header(r0, old_hdr, obj_reg, rscratch1, count, &slow_path_unlock); 1951 __ bind(count); 1952 __ decrement(Address(rthread, JavaThread::held_monitor_count_offset())); 1953 } else { 1954 assert(LockingMode == LM_LIGHTWEIGHT, ""); 1955 __ ldr(old_hdr, Address(obj_reg, oopDesc::mark_offset_in_bytes())); 1956 __ tbnz(old_hdr, exact_log2(markWord::monitor_value), slow_path_unlock); 1957 __ lightweight_unlock(obj_reg, old_hdr, swap_reg, lock_tmp, slow_path_unlock); 1958 __ decrement(Address(rthread, JavaThread::held_monitor_count_offset())); 1959 } 1960 1961 // slow path re-enters here 1962 __ bind(unlock_done); 1963 if (ret_type != T_FLOAT && ret_type != T_DOUBLE && ret_type != T_VOID) { 1964 restore_native_result(masm, ret_type, stack_slots); 1965 } 1966 1967 __ bind(done); 1968 } 1969 1970 Label dtrace_method_exit, dtrace_method_exit_done; 1971 { 1972 uint64_t offset; 1973 __ adrp(rscratch1, ExternalAddress((address)&DTraceMethodProbes), offset); 1974 __ ldrb(rscratch1, Address(rscratch1, offset)); 1975 __ cbnzw(rscratch1, dtrace_method_exit); 1976 __ bind(dtrace_method_exit_done); 1977 } 1978 1979 __ reset_last_Java_frame(false); 1980 1981 // Unbox oop result, e.g. JNIHandles::resolve result. 1982 if (is_reference_type(ret_type)) { 1983 __ resolve_jobject(r0, r1, r2); 1984 } 1985 1986 if (CheckJNICalls) { 1987 // clear_pending_jni_exception_check 1988 __ str(zr, Address(rthread, JavaThread::pending_jni_exception_check_fn_offset())); 1989 } 1990 1991 // reset handle block 1992 __ ldr(r2, Address(rthread, JavaThread::active_handles_offset())); 1993 __ str(zr, Address(r2, JNIHandleBlock::top_offset())); 1994 1995 __ leave(); 1996 1997 // Any exception pending? 1998 __ ldr(rscratch1, Address(rthread, in_bytes(Thread::pending_exception_offset()))); 1999 __ cbnz(rscratch1, exception_pending); 2000 2001 // We're done 2002 __ ret(lr); 2003 2004 // Unexpected paths are out of line and go here 2005 2006 // forward the exception 2007 __ bind(exception_pending); 2008 2009 // and forward the exception 2010 __ far_jump(RuntimeAddress(StubRoutines::forward_exception_entry())); 2011 2012 // Slow path locking & unlocking 2013 if (method->is_synchronized()) { 2014 2015 __ block_comment("Slow path lock {"); 2016 __ bind(slow_path_lock); 2017 2018 // has last_Java_frame setup. No exceptions so do vanilla call not call_VM 2019 // args are (oop obj, BasicLock* lock, JavaThread* thread) 2020 2021 // protect the args we've loaded 2022 save_args(masm, total_c_args, c_arg, out_regs); 2023 2024 __ mov(c_rarg0, obj_reg); 2025 __ mov(c_rarg1, lock_reg); 2026 __ mov(c_rarg2, rthread); 2027 2028 // Not a leaf but we have last_Java_frame setup as we want 2029 __ call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::complete_monitor_locking_C), 3); 2030 restore_args(masm, total_c_args, c_arg, out_regs); 2031 2032 #ifdef ASSERT 2033 { Label L; 2034 __ ldr(rscratch1, Address(rthread, in_bytes(Thread::pending_exception_offset()))); 2035 __ cbz(rscratch1, L); 2036 __ stop("no pending exception allowed on exit from monitorenter"); 2037 __ bind(L); 2038 } 2039 #endif 2040 __ b(lock_done); 2041 2042 __ block_comment("} Slow path lock"); 2043 2044 __ block_comment("Slow path unlock {"); 2045 __ bind(slow_path_unlock); 2046 2047 // If we haven't already saved the native result we must save it now as xmm registers 2048 // are still exposed. 2049 2050 if (ret_type == T_FLOAT || ret_type == T_DOUBLE ) { 2051 save_native_result(masm, ret_type, stack_slots); 2052 } 2053 2054 __ mov(c_rarg2, rthread); 2055 __ lea(c_rarg1, Address(sp, lock_slot_offset * VMRegImpl::stack_slot_size)); 2056 __ mov(c_rarg0, obj_reg); 2057 2058 // Save pending exception around call to VM (which contains an EXCEPTION_MARK) 2059 // NOTE that obj_reg == r19 currently 2060 __ ldr(r19, Address(rthread, in_bytes(Thread::pending_exception_offset()))); 2061 __ str(zr, Address(rthread, in_bytes(Thread::pending_exception_offset()))); 2062 2063 __ rt_call(CAST_FROM_FN_PTR(address, SharedRuntime::complete_monitor_unlocking_C)); 2064 2065 #ifdef ASSERT 2066 { 2067 Label L; 2068 __ ldr(rscratch1, Address(rthread, in_bytes(Thread::pending_exception_offset()))); 2069 __ cbz(rscratch1, L); 2070 __ stop("no pending exception allowed on exit complete_monitor_unlocking_C"); 2071 __ bind(L); 2072 } 2073 #endif /* ASSERT */ 2074 2075 __ str(r19, Address(rthread, in_bytes(Thread::pending_exception_offset()))); 2076 2077 if (ret_type == T_FLOAT || ret_type == T_DOUBLE ) { 2078 restore_native_result(masm, ret_type, stack_slots); 2079 } 2080 __ b(unlock_done); 2081 2082 __ block_comment("} Slow path unlock"); 2083 2084 } // synchronized 2085 2086 // SLOW PATH Reguard the stack if needed 2087 2088 __ bind(reguard); 2089 save_native_result(masm, ret_type, stack_slots); 2090 __ rt_call(CAST_FROM_FN_PTR(address, SharedRuntime::reguard_yellow_pages)); 2091 restore_native_result(masm, ret_type, stack_slots); 2092 // and continue 2093 __ b(reguard_done); 2094 2095 // SLOW PATH safepoint 2096 { 2097 __ block_comment("safepoint {"); 2098 __ bind(safepoint_in_progress); 2099 2100 // Don't use call_VM as it will see a possible pending exception and forward it 2101 // and never return here preventing us from clearing _last_native_pc down below. 2102 // 2103 save_native_result(masm, ret_type, stack_slots); 2104 __ mov(c_rarg0, rthread); 2105 #ifndef PRODUCT 2106 assert(frame::arg_reg_save_area_bytes == 0, "not expecting frame reg save area"); 2107 #endif 2108 __ lea(rscratch1, RuntimeAddress(CAST_FROM_FN_PTR(address, JavaThread::check_special_condition_for_native_trans))); 2109 __ blr(rscratch1); 2110 2111 // Restore any method result value 2112 restore_native_result(masm, ret_type, stack_slots); 2113 2114 __ b(safepoint_in_progress_done); 2115 __ block_comment("} safepoint"); 2116 } 2117 2118 // SLOW PATH dtrace support 2119 { 2120 __ block_comment("dtrace entry {"); 2121 __ bind(dtrace_method_entry); 2122 2123 // We have all of the arguments setup at this point. We must not touch any register 2124 // argument registers at this point (what if we save/restore them there are no oop? 2125 2126 save_args(masm, total_c_args, c_arg, out_regs); 2127 __ mov_metadata(c_rarg1, method()); 2128 __ call_VM_leaf( 2129 CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_entry), 2130 rthread, c_rarg1); 2131 restore_args(masm, total_c_args, c_arg, out_regs); 2132 __ b(dtrace_method_entry_done); 2133 __ block_comment("} dtrace entry"); 2134 } 2135 2136 { 2137 __ block_comment("dtrace exit {"); 2138 __ bind(dtrace_method_exit); 2139 save_native_result(masm, ret_type, stack_slots); 2140 __ mov_metadata(c_rarg1, method()); 2141 __ call_VM_leaf( 2142 CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_exit), 2143 rthread, c_rarg1); 2144 restore_native_result(masm, ret_type, stack_slots); 2145 __ b(dtrace_method_exit_done); 2146 __ block_comment("} dtrace exit"); 2147 } 2148 2149 2150 __ flush(); 2151 2152 nmethod *nm = nmethod::new_native_nmethod(method, 2153 compile_id, 2154 masm->code(), 2155 vep_offset, 2156 frame_complete, 2157 stack_slots / VMRegImpl::slots_per_word, 2158 (is_static ? in_ByteSize(klass_offset) : in_ByteSize(receiver_offset)), 2159 in_ByteSize(lock_slot_offset*VMRegImpl::stack_slot_size), 2160 oop_maps); 2161 2162 return nm; 2163 } 2164 2165 // this function returns the adjust size (in number of words) to a c2i adapter 2166 // activation for use during deoptimization 2167 int Deoptimization::last_frame_adjust(int callee_parameters, int callee_locals) { 2168 assert(callee_locals >= callee_parameters, 2169 "test and remove; got more parms than locals"); 2170 if (callee_locals < callee_parameters) 2171 return 0; // No adjustment for negative locals 2172 int diff = (callee_locals - callee_parameters) * Interpreter::stackElementWords; 2173 // diff is counted in stack words 2174 return align_up(diff, 2); 2175 } 2176 2177 2178 //------------------------------generate_deopt_blob---------------------------- 2179 void SharedRuntime::generate_deopt_blob() { 2180 // Allocate space for the code 2181 ResourceMark rm; 2182 // Setup code generation tools 2183 int pad = 0; 2184 #if INCLUDE_JVMCI 2185 if (EnableJVMCI) { 2186 pad += 512; // Increase the buffer size when compiling for JVMCI 2187 } 2188 #endif 2189 CodeBuffer buffer("deopt_blob", 2048+pad, 1024); 2190 MacroAssembler* masm = new MacroAssembler(&buffer); 2191 int frame_size_in_words; 2192 OopMap* map = nullptr; 2193 OopMapSet *oop_maps = new OopMapSet(); 2194 RegisterSaver reg_save(COMPILER2_OR_JVMCI != 0); 2195 2196 // ------------- 2197 // This code enters when returning to a de-optimized nmethod. A return 2198 // address has been pushed on the stack, and return values are in 2199 // registers. 2200 // If we are doing a normal deopt then we were called from the patched 2201 // nmethod from the point we returned to the nmethod. So the return 2202 // address on the stack is wrong by NativeCall::instruction_size 2203 // We will adjust the value so it looks like we have the original return 2204 // address on the stack (like when we eagerly deoptimized). 2205 // In the case of an exception pending when deoptimizing, we enter 2206 // with a return address on the stack that points after the call we patched 2207 // into the exception handler. We have the following register state from, 2208 // e.g., the forward exception stub (see stubGenerator_x86_64.cpp). 2209 // r0: exception oop 2210 // r19: exception handler 2211 // r3: throwing pc 2212 // So in this case we simply jam r3 into the useless return address and 2213 // the stack looks just like we want. 2214 // 2215 // At this point we need to de-opt. We save the argument return 2216 // registers. We call the first C routine, fetch_unroll_info(). This 2217 // routine captures the return values and returns a structure which 2218 // describes the current frame size and the sizes of all replacement frames. 2219 // The current frame is compiled code and may contain many inlined 2220 // functions, each with their own JVM state. We pop the current frame, then 2221 // push all the new frames. Then we call the C routine unpack_frames() to 2222 // populate these frames. Finally unpack_frames() returns us the new target 2223 // address. Notice that callee-save registers are BLOWN here; they have 2224 // already been captured in the vframeArray at the time the return PC was 2225 // patched. 2226 address start = __ pc(); 2227 Label cont; 2228 2229 // Prolog for non exception case! 2230 2231 // Save everything in sight. 2232 map = reg_save.save_live_registers(masm, 0, &frame_size_in_words); 2233 2234 // Normal deoptimization. Save exec mode for unpack_frames. 2235 __ movw(rcpool, Deoptimization::Unpack_deopt); // callee-saved 2236 __ b(cont); 2237 2238 int reexecute_offset = __ pc() - start; 2239 #if INCLUDE_JVMCI && !defined(COMPILER1) 2240 if (EnableJVMCI && UseJVMCICompiler) { 2241 // JVMCI does not use this kind of deoptimization 2242 __ should_not_reach_here(); 2243 } 2244 #endif 2245 2246 // Reexecute case 2247 // return address is the pc describes what bci to do re-execute at 2248 2249 // No need to update map as each call to save_live_registers will produce identical oopmap 2250 (void) reg_save.save_live_registers(masm, 0, &frame_size_in_words); 2251 2252 __ movw(rcpool, Deoptimization::Unpack_reexecute); // callee-saved 2253 __ b(cont); 2254 2255 #if INCLUDE_JVMCI 2256 Label after_fetch_unroll_info_call; 2257 int implicit_exception_uncommon_trap_offset = 0; 2258 int uncommon_trap_offset = 0; 2259 2260 if (EnableJVMCI) { 2261 implicit_exception_uncommon_trap_offset = __ pc() - start; 2262 2263 __ ldr(lr, Address(rthread, in_bytes(JavaThread::jvmci_implicit_exception_pc_offset()))); 2264 __ str(zr, Address(rthread, in_bytes(JavaThread::jvmci_implicit_exception_pc_offset()))); 2265 2266 uncommon_trap_offset = __ pc() - start; 2267 2268 // Save everything in sight. 2269 reg_save.save_live_registers(masm, 0, &frame_size_in_words); 2270 // fetch_unroll_info needs to call last_java_frame() 2271 Label retaddr; 2272 __ set_last_Java_frame(sp, noreg, retaddr, rscratch1); 2273 2274 __ ldrw(c_rarg1, Address(rthread, in_bytes(JavaThread::pending_deoptimization_offset()))); 2275 __ movw(rscratch1, -1); 2276 __ strw(rscratch1, Address(rthread, in_bytes(JavaThread::pending_deoptimization_offset()))); 2277 2278 __ movw(rcpool, (int32_t)Deoptimization::Unpack_reexecute); 2279 __ mov(c_rarg0, rthread); 2280 __ movw(c_rarg2, rcpool); // exec mode 2281 __ lea(rscratch1, 2282 RuntimeAddress(CAST_FROM_FN_PTR(address, 2283 Deoptimization::uncommon_trap))); 2284 __ blr(rscratch1); 2285 __ bind(retaddr); 2286 oop_maps->add_gc_map( __ pc()-start, map->deep_copy()); 2287 2288 __ reset_last_Java_frame(false); 2289 2290 __ b(after_fetch_unroll_info_call); 2291 } // EnableJVMCI 2292 #endif // INCLUDE_JVMCI 2293 2294 int exception_offset = __ pc() - start; 2295 2296 // Prolog for exception case 2297 2298 // all registers are dead at this entry point, except for r0, and 2299 // r3 which contain the exception oop and exception pc 2300 // respectively. Set them in TLS and fall thru to the 2301 // unpack_with_exception_in_tls entry point. 2302 2303 __ str(r3, Address(rthread, JavaThread::exception_pc_offset())); 2304 __ str(r0, Address(rthread, JavaThread::exception_oop_offset())); 2305 2306 int exception_in_tls_offset = __ pc() - start; 2307 2308 // new implementation because exception oop is now passed in JavaThread 2309 2310 // Prolog for exception case 2311 // All registers must be preserved because they might be used by LinearScan 2312 // Exceptiop oop and throwing PC are passed in JavaThread 2313 // tos: stack at point of call to method that threw the exception (i.e. only 2314 // args are on the stack, no return address) 2315 2316 // The return address pushed by save_live_registers will be patched 2317 // later with the throwing pc. The correct value is not available 2318 // now because loading it from memory would destroy registers. 2319 2320 // NB: The SP at this point must be the SP of the method that is 2321 // being deoptimized. Deoptimization assumes that the frame created 2322 // here by save_live_registers is immediately below the method's SP. 2323 // This is a somewhat fragile mechanism. 2324 2325 // Save everything in sight. 2326 map = reg_save.save_live_registers(masm, 0, &frame_size_in_words); 2327 2328 // Now it is safe to overwrite any register 2329 2330 // Deopt during an exception. Save exec mode for unpack_frames. 2331 __ mov(rcpool, Deoptimization::Unpack_exception); // callee-saved 2332 2333 // load throwing pc from JavaThread and patch it as the return address 2334 // of the current frame. Then clear the field in JavaThread 2335 __ ldr(r3, Address(rthread, JavaThread::exception_pc_offset())); 2336 __ protect_return_address(r3, rscratch1); 2337 __ str(r3, Address(rfp, wordSize)); 2338 __ str(zr, Address(rthread, JavaThread::exception_pc_offset())); 2339 2340 #ifdef ASSERT 2341 // verify that there is really an exception oop in JavaThread 2342 __ ldr(r0, Address(rthread, JavaThread::exception_oop_offset())); 2343 __ verify_oop(r0); 2344 2345 // verify that there is no pending exception 2346 Label no_pending_exception; 2347 __ ldr(rscratch1, Address(rthread, Thread::pending_exception_offset())); 2348 __ cbz(rscratch1, no_pending_exception); 2349 __ stop("must not have pending exception here"); 2350 __ bind(no_pending_exception); 2351 #endif 2352 2353 __ bind(cont); 2354 2355 // Call C code. Need thread and this frame, but NOT official VM entry 2356 // crud. We cannot block on this call, no GC can happen. 2357 // 2358 // UnrollBlock* fetch_unroll_info(JavaThread* thread) 2359 2360 // fetch_unroll_info needs to call last_java_frame(). 2361 2362 Label retaddr; 2363 __ set_last_Java_frame(sp, noreg, retaddr, rscratch1); 2364 #ifdef ASSERT 2365 { Label L; 2366 __ ldr(rscratch1, Address(rthread, JavaThread::last_Java_fp_offset())); 2367 __ cbz(rscratch1, L); 2368 __ stop("SharedRuntime::generate_deopt_blob: last_Java_fp not cleared"); 2369 __ bind(L); 2370 } 2371 #endif // ASSERT 2372 __ mov(c_rarg0, rthread); 2373 __ mov(c_rarg1, rcpool); 2374 __ lea(rscratch1, RuntimeAddress(CAST_FROM_FN_PTR(address, Deoptimization::fetch_unroll_info))); 2375 __ blr(rscratch1); 2376 __ bind(retaddr); 2377 2378 // Need to have an oopmap that tells fetch_unroll_info where to 2379 // find any register it might need. 2380 oop_maps->add_gc_map(__ pc() - start, map); 2381 2382 __ reset_last_Java_frame(false); 2383 2384 #if INCLUDE_JVMCI 2385 if (EnableJVMCI) { 2386 __ bind(after_fetch_unroll_info_call); 2387 } 2388 #endif 2389 2390 // Load UnrollBlock* into r5 2391 __ mov(r5, r0); 2392 2393 __ ldrw(rcpool, Address(r5, Deoptimization::UnrollBlock::unpack_kind_offset())); 2394 Label noException; 2395 __ cmpw(rcpool, Deoptimization::Unpack_exception); // Was exception pending? 2396 __ br(Assembler::NE, noException); 2397 __ ldr(r0, Address(rthread, JavaThread::exception_oop_offset())); 2398 // QQQ this is useless it was null above 2399 __ ldr(r3, Address(rthread, JavaThread::exception_pc_offset())); 2400 __ str(zr, Address(rthread, JavaThread::exception_oop_offset())); 2401 __ str(zr, Address(rthread, JavaThread::exception_pc_offset())); 2402 2403 __ verify_oop(r0); 2404 2405 // Overwrite the result registers with the exception results. 2406 __ str(r0, Address(sp, reg_save.r0_offset_in_bytes())); 2407 // I think this is useless 2408 // __ str(r3, Address(sp, RegisterSaver::r3_offset_in_bytes())); 2409 2410 __ bind(noException); 2411 2412 // Only register save data is on the stack. 2413 // Now restore the result registers. Everything else is either dead 2414 // or captured in the vframeArray. 2415 2416 // Restore fp result register 2417 __ ldrd(v0, Address(sp, reg_save.v0_offset_in_bytes())); 2418 // Restore integer result register 2419 __ ldr(r0, Address(sp, reg_save.r0_offset_in_bytes())); 2420 2421 // Pop all of the register save area off the stack 2422 __ add(sp, sp, frame_size_in_words * wordSize); 2423 2424 // All of the register save area has been popped of the stack. Only the 2425 // return address remains. 2426 2427 // Pop all the frames we must move/replace. 2428 // 2429 // Frame picture (youngest to oldest) 2430 // 1: self-frame (no frame link) 2431 // 2: deopting frame (no frame link) 2432 // 3: caller of deopting frame (could be compiled/interpreted). 2433 // 2434 // Note: by leaving the return address of self-frame on the stack 2435 // and using the size of frame 2 to adjust the stack 2436 // when we are done the return to frame 3 will still be on the stack. 2437 2438 // Pop deoptimized frame 2439 __ ldrw(r2, Address(r5, Deoptimization::UnrollBlock::size_of_deoptimized_frame_offset())); 2440 __ sub(r2, r2, 2 * wordSize); 2441 __ add(sp, sp, r2); 2442 __ ldp(rfp, lr, __ post(sp, 2 * wordSize)); 2443 __ authenticate_return_address(); 2444 // LR should now be the return address to the caller (3) 2445 2446 #ifdef ASSERT 2447 // Compilers generate code that bang the stack by as much as the 2448 // interpreter would need. So this stack banging should never 2449 // trigger a fault. Verify that it does not on non product builds. 2450 __ ldrw(r19, Address(r5, Deoptimization::UnrollBlock::total_frame_sizes_offset())); 2451 __ bang_stack_size(r19, r2); 2452 #endif 2453 // Load address of array of frame pcs into r2 2454 __ ldr(r2, Address(r5, Deoptimization::UnrollBlock::frame_pcs_offset())); 2455 2456 // Trash the old pc 2457 // __ addptr(sp, wordSize); FIXME ???? 2458 2459 // Load address of array of frame sizes into r4 2460 __ ldr(r4, Address(r5, Deoptimization::UnrollBlock::frame_sizes_offset())); 2461 2462 // Load counter into r3 2463 __ ldrw(r3, Address(r5, Deoptimization::UnrollBlock::number_of_frames_offset())); 2464 2465 // Now adjust the caller's stack to make up for the extra locals 2466 // but record the original sp so that we can save it in the skeletal interpreter 2467 // frame and the stack walking of interpreter_sender will get the unextended sp 2468 // value and not the "real" sp value. 2469 2470 const Register sender_sp = r6; 2471 2472 __ mov(sender_sp, sp); 2473 __ ldrw(r19, Address(r5, 2474 Deoptimization::UnrollBlock:: 2475 caller_adjustment_offset())); 2476 __ sub(sp, sp, r19); 2477 2478 // Push interpreter frames in a loop 2479 __ mov(rscratch1, (uint64_t)0xDEADDEAD); // Make a recognizable pattern 2480 __ mov(rscratch2, rscratch1); 2481 Label loop; 2482 __ bind(loop); 2483 __ ldr(r19, Address(__ post(r4, wordSize))); // Load frame size 2484 __ sub(r19, r19, 2*wordSize); // We'll push pc and fp by hand 2485 __ ldr(lr, Address(__ post(r2, wordSize))); // Load pc 2486 __ enter(); // Save old & set new fp 2487 __ sub(sp, sp, r19); // Prolog 2488 // This value is corrected by layout_activation_impl 2489 __ str(zr, Address(rfp, frame::interpreter_frame_last_sp_offset * wordSize)); 2490 __ str(sender_sp, Address(rfp, frame::interpreter_frame_sender_sp_offset * wordSize)); // Make it walkable 2491 __ mov(sender_sp, sp); // Pass sender_sp to next frame 2492 __ sub(r3, r3, 1); // Decrement counter 2493 __ cbnz(r3, loop); 2494 2495 // Re-push self-frame 2496 __ ldr(lr, Address(r2)); 2497 __ enter(); 2498 2499 // Allocate a full sized register save area. We subtract 2 because 2500 // enter() just pushed 2 words 2501 __ sub(sp, sp, (frame_size_in_words - 2) * wordSize); 2502 2503 // Restore frame locals after moving the frame 2504 __ strd(v0, Address(sp, reg_save.v0_offset_in_bytes())); 2505 __ str(r0, Address(sp, reg_save.r0_offset_in_bytes())); 2506 2507 // Call C code. Need thread but NOT official VM entry 2508 // crud. We cannot block on this call, no GC can happen. Call should 2509 // restore return values to their stack-slots with the new SP. 2510 // 2511 // void Deoptimization::unpack_frames(JavaThread* thread, int exec_mode) 2512 2513 // Use rfp because the frames look interpreted now 2514 // Don't need the precise return PC here, just precise enough to point into this code blob. 2515 address the_pc = __ pc(); 2516 __ set_last_Java_frame(sp, rfp, the_pc, rscratch1); 2517 2518 __ mov(c_rarg0, rthread); 2519 __ movw(c_rarg1, rcpool); // second arg: exec_mode 2520 __ lea(rscratch1, RuntimeAddress(CAST_FROM_FN_PTR(address, Deoptimization::unpack_frames))); 2521 __ blr(rscratch1); 2522 2523 // Set an oopmap for the call site 2524 // Use the same PC we used for the last java frame 2525 oop_maps->add_gc_map(the_pc - start, 2526 new OopMap( frame_size_in_words, 0 )); 2527 2528 // Clear fp AND pc 2529 __ reset_last_Java_frame(true); 2530 2531 // Collect return values 2532 __ ldrd(v0, Address(sp, reg_save.v0_offset_in_bytes())); 2533 __ ldr(r0, Address(sp, reg_save.r0_offset_in_bytes())); 2534 // I think this is useless (throwing pc?) 2535 // __ ldr(r3, Address(sp, RegisterSaver::r3_offset_in_bytes())); 2536 2537 // Pop self-frame. 2538 __ leave(); // Epilog 2539 2540 // Jump to interpreter 2541 __ ret(lr); 2542 2543 // Make sure all code is generated 2544 masm->flush(); 2545 2546 _deopt_blob = DeoptimizationBlob::create(&buffer, oop_maps, 0, exception_offset, reexecute_offset, frame_size_in_words); 2547 _deopt_blob->set_unpack_with_exception_in_tls_offset(exception_in_tls_offset); 2548 #if INCLUDE_JVMCI 2549 if (EnableJVMCI) { 2550 _deopt_blob->set_uncommon_trap_offset(uncommon_trap_offset); 2551 _deopt_blob->set_implicit_exception_uncommon_trap_offset(implicit_exception_uncommon_trap_offset); 2552 } 2553 #endif 2554 } 2555 2556 // Number of stack slots between incoming argument block and the start of 2557 // a new frame. The PROLOG must add this many slots to the stack. The 2558 // EPILOG must remove this many slots. aarch64 needs two slots for 2559 // return address and fp. 2560 // TODO think this is correct but check 2561 uint SharedRuntime::in_preserve_stack_slots() { 2562 return 4; 2563 } 2564 2565 uint SharedRuntime::out_preserve_stack_slots() { 2566 return 0; 2567 } 2568 2569 #ifdef COMPILER2 2570 //------------------------------generate_uncommon_trap_blob-------------------- 2571 void SharedRuntime::generate_uncommon_trap_blob() { 2572 // Allocate space for the code 2573 ResourceMark rm; 2574 // Setup code generation tools 2575 CodeBuffer buffer("uncommon_trap_blob", 2048, 1024); 2576 MacroAssembler* masm = new MacroAssembler(&buffer); 2577 2578 assert(SimpleRuntimeFrame::framesize % 4 == 0, "sp not 16-byte aligned"); 2579 2580 address start = __ pc(); 2581 2582 // Push self-frame. We get here with a return address in LR 2583 // and sp should be 16 byte aligned 2584 // push rfp and retaddr by hand 2585 __ protect_return_address(); 2586 __ stp(rfp, lr, Address(__ pre(sp, -2 * wordSize))); 2587 // we don't expect an arg reg save area 2588 #ifndef PRODUCT 2589 assert(frame::arg_reg_save_area_bytes == 0, "not expecting frame reg save area"); 2590 #endif 2591 // compiler left unloaded_class_index in j_rarg0 move to where the 2592 // runtime expects it. 2593 if (c_rarg1 != j_rarg0) { 2594 __ movw(c_rarg1, j_rarg0); 2595 } 2596 2597 // we need to set the past SP to the stack pointer of the stub frame 2598 // and the pc to the address where this runtime call will return 2599 // although actually any pc in this code blob will do). 2600 Label retaddr; 2601 __ set_last_Java_frame(sp, noreg, retaddr, rscratch1); 2602 2603 // Call C code. Need thread but NOT official VM entry 2604 // crud. We cannot block on this call, no GC can happen. Call should 2605 // capture callee-saved registers as well as return values. 2606 // Thread is in rdi already. 2607 // 2608 // UnrollBlock* uncommon_trap(JavaThread* thread, jint unloaded_class_index); 2609 // 2610 // n.b. 2 gp args, 0 fp args, integral return type 2611 2612 __ mov(c_rarg0, rthread); 2613 __ movw(c_rarg2, (unsigned)Deoptimization::Unpack_uncommon_trap); 2614 __ lea(rscratch1, 2615 RuntimeAddress(CAST_FROM_FN_PTR(address, 2616 Deoptimization::uncommon_trap))); 2617 __ blr(rscratch1); 2618 __ bind(retaddr); 2619 2620 // Set an oopmap for the call site 2621 OopMapSet* oop_maps = new OopMapSet(); 2622 OopMap* map = new OopMap(SimpleRuntimeFrame::framesize, 0); 2623 2624 // location of rfp is known implicitly by the frame sender code 2625 2626 oop_maps->add_gc_map(__ pc() - start, map); 2627 2628 __ reset_last_Java_frame(false); 2629 2630 // move UnrollBlock* into r4 2631 __ mov(r4, r0); 2632 2633 #ifdef ASSERT 2634 { Label L; 2635 __ ldrw(rscratch1, Address(r4, Deoptimization::UnrollBlock::unpack_kind_offset())); 2636 __ cmpw(rscratch1, (unsigned)Deoptimization::Unpack_uncommon_trap); 2637 __ br(Assembler::EQ, L); 2638 __ stop("SharedRuntime::generate_uncommon_trap_blob: expected Unpack_uncommon_trap"); 2639 __ bind(L); 2640 } 2641 #endif 2642 2643 // Pop all the frames we must move/replace. 2644 // 2645 // Frame picture (youngest to oldest) 2646 // 1: self-frame (no frame link) 2647 // 2: deopting frame (no frame link) 2648 // 3: caller of deopting frame (could be compiled/interpreted). 2649 2650 // Pop self-frame. We have no frame, and must rely only on r0 and sp. 2651 __ add(sp, sp, (SimpleRuntimeFrame::framesize) << LogBytesPerInt); // Epilog! 2652 2653 // Pop deoptimized frame (int) 2654 __ ldrw(r2, Address(r4, 2655 Deoptimization::UnrollBlock:: 2656 size_of_deoptimized_frame_offset())); 2657 __ sub(r2, r2, 2 * wordSize); 2658 __ add(sp, sp, r2); 2659 __ ldp(rfp, lr, __ post(sp, 2 * wordSize)); 2660 __ authenticate_return_address(); 2661 // LR should now be the return address to the caller (3) frame 2662 2663 #ifdef ASSERT 2664 // Compilers generate code that bang the stack by as much as the 2665 // interpreter would need. So this stack banging should never 2666 // trigger a fault. Verify that it does not on non product builds. 2667 __ ldrw(r1, Address(r4, 2668 Deoptimization::UnrollBlock:: 2669 total_frame_sizes_offset())); 2670 __ bang_stack_size(r1, r2); 2671 #endif 2672 2673 // Load address of array of frame pcs into r2 (address*) 2674 __ ldr(r2, Address(r4, 2675 Deoptimization::UnrollBlock::frame_pcs_offset())); 2676 2677 // Load address of array of frame sizes into r5 (intptr_t*) 2678 __ ldr(r5, Address(r4, 2679 Deoptimization::UnrollBlock:: 2680 frame_sizes_offset())); 2681 2682 // Counter 2683 __ ldrw(r3, Address(r4, 2684 Deoptimization::UnrollBlock:: 2685 number_of_frames_offset())); // (int) 2686 2687 // Now adjust the caller's stack to make up for the extra locals but 2688 // record the original sp so that we can save it in the skeletal 2689 // interpreter frame and the stack walking of interpreter_sender 2690 // will get the unextended sp value and not the "real" sp value. 2691 2692 const Register sender_sp = r8; 2693 2694 __ mov(sender_sp, sp); 2695 __ ldrw(r1, Address(r4, 2696 Deoptimization::UnrollBlock:: 2697 caller_adjustment_offset())); // (int) 2698 __ sub(sp, sp, r1); 2699 2700 // Push interpreter frames in a loop 2701 Label loop; 2702 __ bind(loop); 2703 __ ldr(r1, Address(r5, 0)); // Load frame size 2704 __ sub(r1, r1, 2 * wordSize); // We'll push pc and rfp by hand 2705 __ ldr(lr, Address(r2, 0)); // Save return address 2706 __ enter(); // and old rfp & set new rfp 2707 __ sub(sp, sp, r1); // Prolog 2708 __ str(sender_sp, Address(rfp, frame::interpreter_frame_sender_sp_offset * wordSize)); // Make it walkable 2709 // This value is corrected by layout_activation_impl 2710 __ str(zr, Address(rfp, frame::interpreter_frame_last_sp_offset * wordSize)); 2711 __ mov(sender_sp, sp); // Pass sender_sp to next frame 2712 __ add(r5, r5, wordSize); // Bump array pointer (sizes) 2713 __ add(r2, r2, wordSize); // Bump array pointer (pcs) 2714 __ subsw(r3, r3, 1); // Decrement counter 2715 __ br(Assembler::GT, loop); 2716 __ ldr(lr, Address(r2, 0)); // save final return address 2717 // Re-push self-frame 2718 __ enter(); // & old rfp & set new rfp 2719 2720 // Use rfp because the frames look interpreted now 2721 // Save "the_pc" since it cannot easily be retrieved using the last_java_SP after we aligned SP. 2722 // Don't need the precise return PC here, just precise enough to point into this code blob. 2723 address the_pc = __ pc(); 2724 __ set_last_Java_frame(sp, rfp, the_pc, rscratch1); 2725 2726 // Call C code. Need thread but NOT official VM entry 2727 // crud. We cannot block on this call, no GC can happen. Call should 2728 // restore return values to their stack-slots with the new SP. 2729 // Thread is in rdi already. 2730 // 2731 // BasicType unpack_frames(JavaThread* thread, int exec_mode); 2732 // 2733 // n.b. 2 gp args, 0 fp args, integral return type 2734 2735 // sp should already be aligned 2736 __ mov(c_rarg0, rthread); 2737 __ movw(c_rarg1, (unsigned)Deoptimization::Unpack_uncommon_trap); 2738 __ lea(rscratch1, RuntimeAddress(CAST_FROM_FN_PTR(address, Deoptimization::unpack_frames))); 2739 __ blr(rscratch1); 2740 2741 // Set an oopmap for the call site 2742 // Use the same PC we used for the last java frame 2743 oop_maps->add_gc_map(the_pc - start, new OopMap(SimpleRuntimeFrame::framesize, 0)); 2744 2745 // Clear fp AND pc 2746 __ reset_last_Java_frame(true); 2747 2748 // Pop self-frame. 2749 __ leave(); // Epilog 2750 2751 // Jump to interpreter 2752 __ ret(lr); 2753 2754 // Make sure all code is generated 2755 masm->flush(); 2756 2757 _uncommon_trap_blob = UncommonTrapBlob::create(&buffer, oop_maps, 2758 SimpleRuntimeFrame::framesize >> 1); 2759 } 2760 #endif // COMPILER2 2761 2762 2763 //------------------------------generate_handler_blob------ 2764 // 2765 // Generate a special Compile2Runtime blob that saves all registers, 2766 // and setup oopmap. 2767 // 2768 SafepointBlob* SharedRuntime::generate_handler_blob(address call_ptr, int poll_type) { 2769 ResourceMark rm; 2770 OopMapSet *oop_maps = new OopMapSet(); 2771 OopMap* map; 2772 2773 // Allocate space for the code. Setup code generation tools. 2774 CodeBuffer buffer("handler_blob", 2048, 1024); 2775 MacroAssembler* masm = new MacroAssembler(&buffer); 2776 2777 address start = __ pc(); 2778 address call_pc = nullptr; 2779 int frame_size_in_words; 2780 bool cause_return = (poll_type == POLL_AT_RETURN); 2781 RegisterSaver reg_save(poll_type == POLL_AT_VECTOR_LOOP /* save_vectors */); 2782 2783 // When the signal occurred, the LR was either signed and stored on the stack (in which 2784 // case it will be restored from the stack before being used) or unsigned and not stored 2785 // on the stack. Stipping ensures we get the right value. 2786 __ strip_return_address(); 2787 2788 // Save Integer and Float registers. 2789 map = reg_save.save_live_registers(masm, 0, &frame_size_in_words); 2790 2791 // The following is basically a call_VM. However, we need the precise 2792 // address of the call in order to generate an oopmap. Hence, we do all the 2793 // work ourselves. 2794 2795 Label retaddr; 2796 __ set_last_Java_frame(sp, noreg, retaddr, rscratch1); 2797 2798 // The return address must always be correct so that frame constructor never 2799 // sees an invalid pc. 2800 2801 if (!cause_return) { 2802 // overwrite the return address pushed by save_live_registers 2803 // Additionally, r20 is a callee-saved register so we can look at 2804 // it later to determine if someone changed the return address for 2805 // us! 2806 __ ldr(r20, Address(rthread, JavaThread::saved_exception_pc_offset())); 2807 __ protect_return_address(r20, rscratch1); 2808 __ str(r20, Address(rfp, wordSize)); 2809 } 2810 2811 // Do the call 2812 __ mov(c_rarg0, rthread); 2813 __ lea(rscratch1, RuntimeAddress(call_ptr)); 2814 __ blr(rscratch1); 2815 __ bind(retaddr); 2816 2817 // Set an oopmap for the call site. This oopmap will map all 2818 // oop-registers and debug-info registers as callee-saved. This 2819 // will allow deoptimization at this safepoint to find all possible 2820 // debug-info recordings, as well as let GC find all oops. 2821 2822 oop_maps->add_gc_map( __ pc() - start, map); 2823 2824 Label noException; 2825 2826 __ reset_last_Java_frame(false); 2827 2828 __ membar(Assembler::LoadLoad | Assembler::LoadStore); 2829 2830 __ ldr(rscratch1, Address(rthread, Thread::pending_exception_offset())); 2831 __ cbz(rscratch1, noException); 2832 2833 // Exception pending 2834 2835 reg_save.restore_live_registers(masm); 2836 2837 __ far_jump(RuntimeAddress(StubRoutines::forward_exception_entry())); 2838 2839 // No exception case 2840 __ bind(noException); 2841 2842 Label no_adjust, bail; 2843 if (!cause_return) { 2844 // If our stashed return pc was modified by the runtime we avoid touching it 2845 __ ldr(rscratch1, Address(rfp, wordSize)); 2846 __ cmp(r20, rscratch1); 2847 __ br(Assembler::NE, no_adjust); 2848 __ authenticate_return_address(r20, rscratch1); 2849 2850 #ifdef ASSERT 2851 // Verify the correct encoding of the poll we're about to skip. 2852 // See NativeInstruction::is_ldrw_to_zr() 2853 __ ldrw(rscratch1, Address(r20)); 2854 __ ubfx(rscratch2, rscratch1, 22, 10); 2855 __ cmpw(rscratch2, 0b1011100101); 2856 __ br(Assembler::NE, bail); 2857 __ ubfx(rscratch2, rscratch1, 0, 5); 2858 __ cmpw(rscratch2, 0b11111); 2859 __ br(Assembler::NE, bail); 2860 #endif 2861 // Adjust return pc forward to step over the safepoint poll instruction 2862 __ add(r20, r20, NativeInstruction::instruction_size); 2863 __ protect_return_address(r20, rscratch1); 2864 __ str(r20, Address(rfp, wordSize)); 2865 } 2866 2867 __ bind(no_adjust); 2868 // Normal exit, restore registers and exit. 2869 reg_save.restore_live_registers(masm); 2870 2871 __ ret(lr); 2872 2873 #ifdef ASSERT 2874 __ bind(bail); 2875 __ stop("Attempting to adjust pc to skip safepoint poll but the return point is not what we expected"); 2876 #endif 2877 2878 // Make sure all code is generated 2879 masm->flush(); 2880 2881 // Fill-out other meta info 2882 return SafepointBlob::create(&buffer, oop_maps, frame_size_in_words); 2883 } 2884 2885 // 2886 // generate_resolve_blob - call resolution (static/virtual/opt-virtual/ic-miss 2887 // 2888 // Generate a stub that calls into vm to find out the proper destination 2889 // of a java call. All the argument registers are live at this point 2890 // but since this is generic code we don't know what they are and the caller 2891 // must do any gc of the args. 2892 // 2893 RuntimeStub* SharedRuntime::generate_resolve_blob(address destination, const char* name) { 2894 assert (StubRoutines::forward_exception_entry() != nullptr, "must be generated before"); 2895 2896 // allocate space for the code 2897 ResourceMark rm; 2898 2899 CodeBuffer buffer(name, 1000, 512); 2900 MacroAssembler* masm = new MacroAssembler(&buffer); 2901 2902 int frame_size_in_words; 2903 RegisterSaver reg_save(false /* save_vectors */); 2904 2905 OopMapSet *oop_maps = new OopMapSet(); 2906 OopMap* map = nullptr; 2907 2908 int start = __ offset(); 2909 2910 map = reg_save.save_live_registers(masm, 0, &frame_size_in_words); 2911 2912 int frame_complete = __ offset(); 2913 2914 { 2915 Label retaddr; 2916 __ set_last_Java_frame(sp, noreg, retaddr, rscratch1); 2917 2918 __ mov(c_rarg0, rthread); 2919 __ lea(rscratch1, RuntimeAddress(destination)); 2920 2921 __ blr(rscratch1); 2922 __ bind(retaddr); 2923 } 2924 2925 // Set an oopmap for the call site. 2926 // We need this not only for callee-saved registers, but also for volatile 2927 // registers that the compiler might be keeping live across a safepoint. 2928 2929 oop_maps->add_gc_map( __ offset() - start, map); 2930 2931 // r0 contains the address we are going to jump to assuming no exception got installed 2932 2933 // clear last_Java_sp 2934 __ reset_last_Java_frame(false); 2935 // check for pending exceptions 2936 Label pending; 2937 __ ldr(rscratch1, Address(rthread, Thread::pending_exception_offset())); 2938 __ cbnz(rscratch1, pending); 2939 2940 // get the returned Method* 2941 __ get_vm_result_2(rmethod, rthread); 2942 __ str(rmethod, Address(sp, reg_save.reg_offset_in_bytes(rmethod))); 2943 2944 // r0 is where we want to jump, overwrite rscratch1 which is saved and scratch 2945 __ str(r0, Address(sp, reg_save.rscratch1_offset_in_bytes())); 2946 reg_save.restore_live_registers(masm); 2947 2948 // We are back to the original state on entry and ready to go. 2949 2950 __ br(rscratch1); 2951 2952 // Pending exception after the safepoint 2953 2954 __ bind(pending); 2955 2956 reg_save.restore_live_registers(masm); 2957 2958 // exception pending => remove activation and forward to exception handler 2959 2960 __ str(zr, Address(rthread, JavaThread::vm_result_offset())); 2961 2962 __ ldr(r0, Address(rthread, Thread::pending_exception_offset())); 2963 __ far_jump(RuntimeAddress(StubRoutines::forward_exception_entry())); 2964 2965 // ------------- 2966 // make sure all code is generated 2967 masm->flush(); 2968 2969 // return the blob 2970 // frame_size_words or bytes?? 2971 return RuntimeStub::new_runtime_stub(name, &buffer, frame_complete, frame_size_in_words, oop_maps, true); 2972 } 2973 2974 #ifdef COMPILER2 2975 // This is here instead of runtime_aarch64_64.cpp because it uses SimpleRuntimeFrame 2976 // 2977 //------------------------------generate_exception_blob--------------------------- 2978 // creates exception blob at the end 2979 // Using exception blob, this code is jumped from a compiled method. 2980 // (see emit_exception_handler in x86_64.ad file) 2981 // 2982 // Given an exception pc at a call we call into the runtime for the 2983 // handler in this method. This handler might merely restore state 2984 // (i.e. callee save registers) unwind the frame and jump to the 2985 // exception handler for the nmethod if there is no Java level handler 2986 // for the nmethod. 2987 // 2988 // This code is entered with a jmp. 2989 // 2990 // Arguments: 2991 // r0: exception oop 2992 // r3: exception pc 2993 // 2994 // Results: 2995 // r0: exception oop 2996 // r3: exception pc in caller or ??? 2997 // destination: exception handler of caller 2998 // 2999 // Note: the exception pc MUST be at a call (precise debug information) 3000 // Registers r0, r3, r2, r4, r5, r8-r11 are not callee saved. 3001 // 3002 3003 void OptoRuntime::generate_exception_blob() { 3004 assert(!OptoRuntime::is_callee_saved_register(R3_num), ""); 3005 assert(!OptoRuntime::is_callee_saved_register(R0_num), ""); 3006 assert(!OptoRuntime::is_callee_saved_register(R2_num), ""); 3007 3008 assert(SimpleRuntimeFrame::framesize % 4 == 0, "sp not 16-byte aligned"); 3009 3010 // Allocate space for the code 3011 ResourceMark rm; 3012 // Setup code generation tools 3013 CodeBuffer buffer("exception_blob", 2048, 1024); 3014 MacroAssembler* masm = new MacroAssembler(&buffer); 3015 3016 // TODO check various assumptions made here 3017 // 3018 // make sure we do so before running this 3019 3020 address start = __ pc(); 3021 3022 // push rfp and retaddr by hand 3023 // Exception pc is 'return address' for stack walker 3024 __ protect_return_address(); 3025 __ stp(rfp, lr, Address(__ pre(sp, -2 * wordSize))); 3026 // there are no callee save registers and we don't expect an 3027 // arg reg save area 3028 #ifndef PRODUCT 3029 assert(frame::arg_reg_save_area_bytes == 0, "not expecting frame reg save area"); 3030 #endif 3031 // Store exception in Thread object. We cannot pass any arguments to the 3032 // handle_exception call, since we do not want to make any assumption 3033 // about the size of the frame where the exception happened in. 3034 __ str(r0, Address(rthread, JavaThread::exception_oop_offset())); 3035 __ str(r3, Address(rthread, JavaThread::exception_pc_offset())); 3036 3037 // This call does all the hard work. It checks if an exception handler 3038 // exists in the method. 3039 // If so, it returns the handler address. 3040 // If not, it prepares for stack-unwinding, restoring the callee-save 3041 // registers of the frame being removed. 3042 // 3043 // address OptoRuntime::handle_exception_C(JavaThread* thread) 3044 // 3045 // n.b. 1 gp arg, 0 fp args, integral return type 3046 3047 // the stack should always be aligned 3048 address the_pc = __ pc(); 3049 __ set_last_Java_frame(sp, noreg, the_pc, rscratch1); 3050 __ mov(c_rarg0, rthread); 3051 __ lea(rscratch1, RuntimeAddress(CAST_FROM_FN_PTR(address, OptoRuntime::handle_exception_C))); 3052 __ blr(rscratch1); 3053 // handle_exception_C is a special VM call which does not require an explicit 3054 // instruction sync afterwards. 3055 3056 // May jump to SVE compiled code 3057 __ reinitialize_ptrue(); 3058 3059 // Set an oopmap for the call site. This oopmap will only be used if we 3060 // are unwinding the stack. Hence, all locations will be dead. 3061 // Callee-saved registers will be the same as the frame above (i.e., 3062 // handle_exception_stub), since they were restored when we got the 3063 // exception. 3064 3065 OopMapSet* oop_maps = new OopMapSet(); 3066 3067 oop_maps->add_gc_map(the_pc - start, new OopMap(SimpleRuntimeFrame::framesize, 0)); 3068 3069 __ reset_last_Java_frame(false); 3070 3071 // Restore callee-saved registers 3072 3073 // rfp is an implicitly saved callee saved register (i.e. the calling 3074 // convention will save restore it in prolog/epilog) Other than that 3075 // there are no callee save registers now that adapter frames are gone. 3076 // and we dont' expect an arg reg save area 3077 __ ldp(rfp, r3, Address(__ post(sp, 2 * wordSize))); 3078 __ authenticate_return_address(r3); 3079 3080 // r0: exception handler 3081 3082 // We have a handler in r0 (could be deopt blob). 3083 __ mov(r8, r0); 3084 3085 // Get the exception oop 3086 __ ldr(r0, Address(rthread, JavaThread::exception_oop_offset())); 3087 // Get the exception pc in case we are deoptimized 3088 __ ldr(r4, Address(rthread, JavaThread::exception_pc_offset())); 3089 #ifdef ASSERT 3090 __ str(zr, Address(rthread, JavaThread::exception_handler_pc_offset())); 3091 __ str(zr, Address(rthread, JavaThread::exception_pc_offset())); 3092 #endif 3093 // Clear the exception oop so GC no longer processes it as a root. 3094 __ str(zr, Address(rthread, JavaThread::exception_oop_offset())); 3095 3096 // r0: exception oop 3097 // r8: exception handler 3098 // r4: exception pc 3099 // Jump to handler 3100 3101 __ br(r8); 3102 3103 // Make sure all code is generated 3104 masm->flush(); 3105 3106 // Set exception blob 3107 _exception_blob = ExceptionBlob::create(&buffer, oop_maps, SimpleRuntimeFrame::framesize >> 1); 3108 } 3109 3110 #endif // COMPILER2