1 /* 2 * Copyright (c) 1999, 2023, Oracle and/or its affiliates. All rights reserved. 3 * Copyright (c) 2014, 2021, Red Hat Inc. All rights reserved. 4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 5 * 6 * This code is free software; you can redistribute it and/or modify it 7 * under the terms of the GNU General Public License version 2 only, as 8 * published by the Free Software Foundation. 9 * 10 * This code is distributed in the hope that it will be useful, but WITHOUT 11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 13 * version 2 for more details (a copy is included in the LICENSE file that 14 * accompanied this code). 15 * 16 * You should have received a copy of the GNU General Public License version 17 * 2 along with this work; if not, write to the Free Software Foundation, 18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 19 * 20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 21 * or visit www.oracle.com if you need additional information or have any 22 * questions. 23 * 24 */ 25 26 #include "precompiled.hpp" 27 #include "asm/assembler.hpp" 28 #include "c1/c1_CodeStubs.hpp" 29 #include "c1/c1_Defs.hpp" 30 #include "c1/c1_MacroAssembler.hpp" 31 #include "c1/c1_Runtime1.hpp" 32 #include "compiler/disassembler.hpp" 33 #include "compiler/oopMap.hpp" 34 #include "gc/shared/cardTable.hpp" 35 #include "gc/shared/cardTableBarrierSet.hpp" 36 #include "gc/shared/collectedHeap.hpp" 37 #include "gc/shared/tlab_globals.hpp" 38 #include "interpreter/interpreter.hpp" 39 #include "memory/universe.hpp" 40 #include "nativeInst_aarch64.hpp" 41 #include "oops/oop.inline.hpp" 42 #include "prims/jvmtiExport.hpp" 43 #include "register_aarch64.hpp" 44 #include "runtime/sharedRuntime.hpp" 45 #include "runtime/signature.hpp" 46 #include "runtime/stubRoutines.hpp" 47 #include "runtime/vframe.hpp" 48 #include "runtime/vframeArray.hpp" 49 #include "utilities/powerOfTwo.hpp" 50 #include "vmreg_aarch64.inline.hpp" 51 52 53 // Implementation of StubAssembler 54 55 int StubAssembler::call_RT(Register oop_result1, Register metadata_result, address entry, int args_size) { 56 // setup registers 57 assert(!(oop_result1->is_valid() || metadata_result->is_valid()) || oop_result1 != metadata_result, "registers must be different"); 58 assert(oop_result1 != rthread && metadata_result != rthread, "registers must be different"); 59 assert(args_size >= 0, "illegal args_size"); 60 bool align_stack = false; 61 62 mov(c_rarg0, rthread); 63 set_num_rt_args(0); // Nothing on stack 64 65 Label retaddr; 66 set_last_Java_frame(sp, rfp, retaddr, rscratch1); 67 68 // do the call 69 lea(rscratch1, RuntimeAddress(entry)); 70 blr(rscratch1); 71 bind(retaddr); 72 int call_offset = offset(); 73 // verify callee-saved register 74 #ifdef ASSERT 75 push(r0, sp); 76 { Label L; 77 get_thread(r0); 78 cmp(rthread, r0); 79 br(Assembler::EQ, L); 80 stop("StubAssembler::call_RT: rthread not callee saved?"); 81 bind(L); 82 } 83 pop(r0, sp); 84 #endif 85 reset_last_Java_frame(true); 86 87 // check for pending exceptions 88 { Label L; 89 // check for pending exceptions (java_thread is set upon return) 90 ldr(rscratch1, Address(rthread, in_bytes(Thread::pending_exception_offset()))); 91 cbz(rscratch1, L); 92 // exception pending => remove activation and forward to exception handler 93 // make sure that the vm_results are cleared 94 if (oop_result1->is_valid()) { 95 str(zr, Address(rthread, JavaThread::vm_result_offset())); 96 } 97 if (metadata_result->is_valid()) { 98 str(zr, Address(rthread, JavaThread::vm_result_2_offset())); 99 } 100 if (frame_size() == no_frame_size) { 101 leave(); 102 far_jump(RuntimeAddress(StubRoutines::forward_exception_entry())); 103 } else if (_stub_id == Runtime1::forward_exception_id) { 104 should_not_reach_here(); 105 } else { 106 far_jump(RuntimeAddress(Runtime1::entry_for(Runtime1::forward_exception_id))); 107 } 108 bind(L); 109 } 110 // get oop results if there are any and reset the values in the thread 111 if (oop_result1->is_valid()) { 112 get_vm_result(oop_result1, rthread); 113 } 114 if (metadata_result->is_valid()) { 115 get_vm_result_2(metadata_result, rthread); 116 } 117 return call_offset; 118 } 119 120 121 int StubAssembler::call_RT(Register oop_result1, Register metadata_result, address entry, Register arg1) { 122 mov(c_rarg1, arg1); 123 return call_RT(oop_result1, metadata_result, entry, 1); 124 } 125 126 127 int StubAssembler::call_RT(Register oop_result1, Register metadata_result, address entry, Register arg1, Register arg2) { 128 if (c_rarg1 == arg2) { 129 if (c_rarg2 == arg1) { 130 mov(rscratch1, arg1); 131 mov(arg1, arg2); 132 mov(arg2, rscratch1); 133 } else { 134 mov(c_rarg2, arg2); 135 mov(c_rarg1, arg1); 136 } 137 } else { 138 mov(c_rarg1, arg1); 139 mov(c_rarg2, arg2); 140 } 141 return call_RT(oop_result1, metadata_result, entry, 2); 142 } 143 144 145 int StubAssembler::call_RT(Register oop_result1, Register metadata_result, address entry, Register arg1, Register arg2, Register arg3) { 146 // if there is any conflict use the stack 147 if (arg1 == c_rarg2 || arg1 == c_rarg3 || 148 arg2 == c_rarg1 || arg2 == c_rarg3 || 149 arg3 == c_rarg1 || arg3 == c_rarg2) { 150 stp(arg3, arg2, Address(pre(sp, -2 * wordSize))); 151 stp(arg1, zr, Address(pre(sp, -2 * wordSize))); 152 ldp(c_rarg1, zr, Address(post(sp, 2 * wordSize))); 153 ldp(c_rarg3, c_rarg2, Address(post(sp, 2 * wordSize))); 154 } else { 155 mov(c_rarg1, arg1); 156 mov(c_rarg2, arg2); 157 mov(c_rarg3, arg3); 158 } 159 return call_RT(oop_result1, metadata_result, entry, 3); 160 } 161 162 enum return_state_t { 163 does_not_return, requires_return 164 }; 165 166 167 // Implementation of StubFrame 168 169 class StubFrame: public StackObj { 170 private: 171 StubAssembler* _sasm; 172 bool _return_state; 173 174 public: 175 StubFrame(StubAssembler* sasm, const char* name, bool must_gc_arguments, return_state_t return_state=requires_return); 176 void load_argument(int offset_in_words, Register reg); 177 178 ~StubFrame(); 179 };; 180 181 void StubAssembler::prologue(const char* name, bool must_gc_arguments) { 182 set_info(name, must_gc_arguments); 183 enter(); 184 } 185 186 void StubAssembler::epilogue() { 187 leave(); 188 ret(lr); 189 } 190 191 #define __ _sasm-> 192 193 StubFrame::StubFrame(StubAssembler* sasm, const char* name, bool must_gc_arguments, return_state_t return_state) { 194 _sasm = sasm; 195 _return_state = return_state; 196 __ prologue(name, must_gc_arguments); 197 } 198 199 // load parameters that were stored with LIR_Assembler::store_parameter 200 // Note: offsets for store_parameter and load_argument must match 201 void StubFrame::load_argument(int offset_in_words, Register reg) { 202 __ load_parameter(offset_in_words, reg); 203 } 204 205 StubFrame::~StubFrame() { 206 if (_return_state == requires_return) { 207 __ epilogue(); 208 } else { 209 __ should_not_reach_here(); 210 } 211 } 212 213 #undef __ 214 215 216 // Implementation of Runtime1 217 218 #define __ sasm-> 219 220 const int float_regs_as_doubles_size_in_slots = pd_nof_fpu_regs_frame_map * 2; 221 222 // Stack layout for saving/restoring all the registers needed during a runtime 223 // call (this includes deoptimization) 224 // Note: note that users of this frame may well have arguments to some runtime 225 // while these values are on the stack. These positions neglect those arguments 226 // but the code in save_live_registers will take the argument count into 227 // account. 228 // 229 230 enum reg_save_layout { 231 reg_save_frame_size = 32 /* float */ + 32 /* integer */ 232 }; 233 234 // Save off registers which might be killed by calls into the runtime. 235 // Tries to smart of about FP registers. In particular we separate 236 // saving and describing the FPU registers for deoptimization since we 237 // have to save the FPU registers twice if we describe them. The 238 // deopt blob is the only thing which needs to describe FPU registers. 239 // In all other cases it should be sufficient to simply save their 240 // current value. 241 242 static int cpu_reg_save_offsets[FrameMap::nof_cpu_regs]; 243 static int fpu_reg_save_offsets[FrameMap::nof_fpu_regs]; 244 static int reg_save_size_in_words; 245 static int frame_size_in_bytes = -1; 246 247 static OopMap* generate_oop_map(StubAssembler* sasm, bool save_fpu_registers) { 248 int frame_size_in_bytes = reg_save_frame_size * BytesPerWord; 249 sasm->set_frame_size(frame_size_in_bytes / BytesPerWord); 250 int frame_size_in_slots = frame_size_in_bytes / sizeof(jint); 251 OopMap* oop_map = new OopMap(frame_size_in_slots, 0); 252 253 for (int i = 0; i < FrameMap::nof_cpu_regs; i++) { 254 Register r = as_Register(i); 255 if (i <= 18 && i != rscratch1->encoding() && i != rscratch2->encoding()) { 256 int sp_offset = cpu_reg_save_offsets[i]; 257 oop_map->set_callee_saved(VMRegImpl::stack2reg(sp_offset), 258 r->as_VMReg()); 259 } 260 } 261 262 if (save_fpu_registers) { 263 for (int i = 0; i < FrameMap::nof_fpu_regs; i++) { 264 FloatRegister r = as_FloatRegister(i); 265 { 266 int sp_offset = fpu_reg_save_offsets[i]; 267 oop_map->set_callee_saved(VMRegImpl::stack2reg(sp_offset), 268 r->as_VMReg()); 269 } 270 } 271 } 272 return oop_map; 273 } 274 275 static OopMap* save_live_registers(StubAssembler* sasm, 276 bool save_fpu_registers = true) { 277 __ block_comment("save_live_registers"); 278 279 __ push(RegSet::range(r0, r29), sp); // integer registers except lr & sp 280 281 if (save_fpu_registers) { 282 for (int i = 31; i>= 0; i -= 4) { 283 __ sub(sp, sp, 4 * wordSize); // no pre-increment for st1. Emulate it without modifying other registers 284 __ st1(as_FloatRegister(i-3), as_FloatRegister(i-2), as_FloatRegister(i-1), 285 as_FloatRegister(i), __ T1D, Address(sp)); 286 } 287 } else { 288 __ add(sp, sp, -32 * wordSize); 289 } 290 291 return generate_oop_map(sasm, save_fpu_registers); 292 } 293 294 static void restore_live_registers(StubAssembler* sasm, bool restore_fpu_registers = true) { 295 if (restore_fpu_registers) { 296 for (int i = 0; i < 32; i += 4) 297 __ ld1(as_FloatRegister(i), as_FloatRegister(i+1), as_FloatRegister(i+2), 298 as_FloatRegister(i+3), __ T1D, Address(__ post(sp, 4 * wordSize))); 299 } else { 300 __ add(sp, sp, 32 * wordSize); 301 } 302 303 __ pop(RegSet::range(r0, r29), sp); 304 } 305 306 static void restore_live_registers_except_r0(StubAssembler* sasm, bool restore_fpu_registers = true) { 307 308 if (restore_fpu_registers) { 309 for (int i = 0; i < 32; i += 4) 310 __ ld1(as_FloatRegister(i), as_FloatRegister(i+1), as_FloatRegister(i+2), 311 as_FloatRegister(i+3), __ T1D, Address(__ post(sp, 4 * wordSize))); 312 } else { 313 __ add(sp, sp, 32 * wordSize); 314 } 315 316 __ ldp(zr, r1, Address(__ post(sp, 16))); 317 __ pop(RegSet::range(r2, r29), sp); 318 } 319 320 321 322 void Runtime1::initialize_pd() { 323 int i; 324 int sp_offset = 0; 325 326 // all float registers are saved explicitly 327 assert(FrameMap::nof_fpu_regs == 32, "double registers not handled here"); 328 for (i = 0; i < FrameMap::nof_fpu_regs; i++) { 329 fpu_reg_save_offsets[i] = sp_offset; 330 sp_offset += 2; // SP offsets are in halfwords 331 } 332 333 for (i = 0; i < FrameMap::nof_cpu_regs; i++) { 334 Register r = as_Register(i); 335 cpu_reg_save_offsets[i] = sp_offset; 336 sp_offset += 2; // SP offsets are in halfwords 337 } 338 } 339 340 341 // target: the entry point of the method that creates and posts the exception oop 342 // has_argument: true if the exception needs arguments (passed in rscratch1 and rscratch2) 343 344 OopMapSet* Runtime1::generate_exception_throw(StubAssembler* sasm, address target, bool has_argument) { 345 // make a frame and preserve the caller's caller-save registers 346 OopMap* oop_map = save_live_registers(sasm); 347 int call_offset; 348 if (!has_argument) { 349 call_offset = __ call_RT(noreg, noreg, target); 350 } else { 351 __ mov(c_rarg1, rscratch1); 352 __ mov(c_rarg2, rscratch2); 353 call_offset = __ call_RT(noreg, noreg, target); 354 } 355 OopMapSet* oop_maps = new OopMapSet(); 356 oop_maps->add_gc_map(call_offset, oop_map); 357 return oop_maps; 358 } 359 360 361 OopMapSet* Runtime1::generate_handle_exception(StubID id, StubAssembler *sasm) { 362 __ block_comment("generate_handle_exception"); 363 364 // incoming parameters 365 const Register exception_oop = r0; 366 const Register exception_pc = r3; 367 // other registers used in this stub 368 369 // Save registers, if required. 370 OopMapSet* oop_maps = new OopMapSet(); 371 OopMap* oop_map = nullptr; 372 switch (id) { 373 case forward_exception_id: 374 // We're handling an exception in the context of a compiled frame. 375 // The registers have been saved in the standard places. Perform 376 // an exception lookup in the caller and dispatch to the handler 377 // if found. Otherwise unwind and dispatch to the callers 378 // exception handler. 379 oop_map = generate_oop_map(sasm, 1 /*thread*/); 380 381 // load and clear pending exception oop into r0 382 __ ldr(exception_oop, Address(rthread, Thread::pending_exception_offset())); 383 __ str(zr, Address(rthread, Thread::pending_exception_offset())); 384 385 // load issuing PC (the return address for this stub) into r3 386 __ ldr(exception_pc, Address(rfp, 1*BytesPerWord)); 387 __ authenticate_return_address(exception_pc); 388 389 // make sure that the vm_results are cleared (may be unnecessary) 390 __ str(zr, Address(rthread, JavaThread::vm_result_offset())); 391 __ str(zr, Address(rthread, JavaThread::vm_result_2_offset())); 392 break; 393 case handle_exception_nofpu_id: 394 case handle_exception_id: 395 // At this point all registers MAY be live. 396 oop_map = save_live_registers(sasm, id != handle_exception_nofpu_id); 397 break; 398 case handle_exception_from_callee_id: { 399 // At this point all registers except exception oop (r0) and 400 // exception pc (lr) are dead. 401 const int frame_size = 2 /*fp, return address*/; 402 oop_map = new OopMap(frame_size * VMRegImpl::slots_per_word, 0); 403 sasm->set_frame_size(frame_size); 404 break; 405 } 406 default: ShouldNotReachHere(); 407 } 408 409 // verify that only r0 and r3 are valid at this time 410 __ invalidate_registers(false, true, true, false, true, true); 411 // verify that r0 contains a valid exception 412 __ verify_not_null_oop(exception_oop); 413 414 #ifdef ASSERT 415 // check that fields in JavaThread for exception oop and issuing pc are 416 // empty before writing to them 417 Label oop_empty; 418 __ ldr(rscratch1, Address(rthread, JavaThread::exception_oop_offset())); 419 __ cbz(rscratch1, oop_empty); 420 __ stop("exception oop already set"); 421 __ bind(oop_empty); 422 423 Label pc_empty; 424 __ ldr(rscratch1, Address(rthread, JavaThread::exception_pc_offset())); 425 __ cbz(rscratch1, pc_empty); 426 __ stop("exception pc already set"); 427 __ bind(pc_empty); 428 #endif 429 430 // save exception oop and issuing pc into JavaThread 431 // (exception handler will load it from here) 432 __ str(exception_oop, Address(rthread, JavaThread::exception_oop_offset())); 433 __ str(exception_pc, Address(rthread, JavaThread::exception_pc_offset())); 434 435 // patch throwing pc into return address (has bci & oop map) 436 __ protect_return_address(exception_pc); 437 __ str(exception_pc, Address(rfp, 1*BytesPerWord)); 438 439 // compute the exception handler. 440 // the exception oop and the throwing pc are read from the fields in JavaThread 441 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, exception_handler_for_pc)); 442 oop_maps->add_gc_map(call_offset, oop_map); 443 444 // r0: handler address 445 // will be the deopt blob if nmethod was deoptimized while we looked up 446 // handler regardless of whether handler existed in the nmethod. 447 448 // only r0 is valid at this time, all other registers have been destroyed by the runtime call 449 __ invalidate_registers(false, true, true, true, true, true); 450 451 // patch the return address, this stub will directly return to the exception handler 452 __ protect_return_address(r0); 453 __ str(r0, Address(rfp, 1*BytesPerWord)); 454 455 switch (id) { 456 case forward_exception_id: 457 case handle_exception_nofpu_id: 458 case handle_exception_id: 459 // Restore the registers that were saved at the beginning. 460 restore_live_registers(sasm, id != handle_exception_nofpu_id); 461 break; 462 case handle_exception_from_callee_id: 463 break; 464 default: ShouldNotReachHere(); 465 } 466 467 return oop_maps; 468 } 469 470 471 void Runtime1::generate_unwind_exception(StubAssembler *sasm) { 472 // incoming parameters 473 const Register exception_oop = r0; 474 // callee-saved copy of exception_oop during runtime call 475 const Register exception_oop_callee_saved = r19; 476 // other registers used in this stub 477 const Register exception_pc = r3; 478 const Register handler_addr = r1; 479 480 if (AbortVMOnException) { 481 __ mov(rscratch1, exception_oop); 482 __ enter(); 483 save_live_registers(sasm); 484 __ call_VM_leaf(CAST_FROM_FN_PTR(address, check_abort_on_vm_exception), rscratch1); 485 restore_live_registers(sasm); 486 __ leave(); 487 } 488 489 // verify that only r0, is valid at this time 490 __ invalidate_registers(false, true, true, true, true, true); 491 492 #ifdef ASSERT 493 // check that fields in JavaThread for exception oop and issuing pc are empty 494 Label oop_empty; 495 __ ldr(rscratch1, Address(rthread, JavaThread::exception_oop_offset())); 496 __ cbz(rscratch1, oop_empty); 497 __ stop("exception oop must be empty"); 498 __ bind(oop_empty); 499 500 Label pc_empty; 501 __ ldr(rscratch1, Address(rthread, JavaThread::exception_pc_offset())); 502 __ cbz(rscratch1, pc_empty); 503 __ stop("exception pc must be empty"); 504 __ bind(pc_empty); 505 #endif 506 507 // Save our return address because 508 // exception_handler_for_return_address will destroy it. We also 509 // save exception_oop 510 __ mov(r3, lr); 511 __ protect_return_address(); 512 __ stp(lr, exception_oop, Address(__ pre(sp, -2 * wordSize))); 513 514 // search the exception handler address of the caller (using the return address) 515 __ call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::exception_handler_for_return_address), rthread, r3); 516 // r0: exception handler address of the caller 517 518 // Only R0 is valid at this time; all other registers have been 519 // destroyed by the call. 520 __ invalidate_registers(false, true, true, true, false, true); 521 522 // move result of call into correct register 523 __ mov(handler_addr, r0); 524 525 // get throwing pc (= return address). 526 // lr has been destroyed by the call 527 __ ldp(lr, exception_oop, Address(__ post(sp, 2 * wordSize))); 528 __ authenticate_return_address(); 529 __ mov(r3, lr); 530 531 __ verify_not_null_oop(exception_oop); 532 533 // continue at exception handler (return address removed) 534 // note: do *not* remove arguments when unwinding the 535 // activation since the caller assumes having 536 // all arguments on the stack when entering the 537 // runtime to determine the exception handler 538 // (GC happens at call site with arguments!) 539 // r0: exception oop 540 // r3: throwing pc 541 // r1: exception handler 542 __ br(handler_addr); 543 } 544 545 546 547 OopMapSet* Runtime1::generate_patching(StubAssembler* sasm, address target) { 548 // use the maximum number of runtime-arguments here because it is difficult to 549 // distinguish each RT-Call. 550 // Note: This number affects also the RT-Call in generate_handle_exception because 551 // the oop-map is shared for all calls. 552 DeoptimizationBlob* deopt_blob = SharedRuntime::deopt_blob(); 553 assert(deopt_blob != nullptr, "deoptimization blob must have been created"); 554 555 OopMap* oop_map = save_live_registers(sasm); 556 557 __ mov(c_rarg0, rthread); 558 Label retaddr; 559 __ set_last_Java_frame(sp, rfp, retaddr, rscratch1); 560 // do the call 561 __ lea(rscratch1, RuntimeAddress(target)); 562 __ blr(rscratch1); 563 __ bind(retaddr); 564 OopMapSet* oop_maps = new OopMapSet(); 565 oop_maps->add_gc_map(__ offset(), oop_map); 566 // verify callee-saved register 567 #ifdef ASSERT 568 { Label L; 569 __ get_thread(rscratch1); 570 __ cmp(rthread, rscratch1); 571 __ br(Assembler::EQ, L); 572 __ stop("StubAssembler::call_RT: rthread not callee saved?"); 573 __ bind(L); 574 } 575 #endif 576 577 __ reset_last_Java_frame(true); 578 579 #ifdef ASSERT 580 // check that fields in JavaThread for exception oop and issuing pc are empty 581 Label oop_empty; 582 __ ldr(rscratch1, Address(rthread, Thread::pending_exception_offset())); 583 __ cbz(rscratch1, oop_empty); 584 __ stop("exception oop must be empty"); 585 __ bind(oop_empty); 586 587 Label pc_empty; 588 __ ldr(rscratch1, Address(rthread, JavaThread::exception_pc_offset())); 589 __ cbz(rscratch1, pc_empty); 590 __ stop("exception pc must be empty"); 591 __ bind(pc_empty); 592 #endif 593 594 // Runtime will return true if the nmethod has been deoptimized, this is the 595 // expected scenario and anything else is an error. Note that we maintain a 596 // check on the result purely as a defensive measure. 597 Label no_deopt; 598 __ cbz(r0, no_deopt); // Have we deoptimized? 599 600 // Perform a re-execute. The proper return address is already on the stack, 601 // we just need to restore registers, pop all of our frame but the return 602 // address and jump to the deopt blob. 603 restore_live_registers(sasm); 604 __ leave(); 605 __ far_jump(RuntimeAddress(deopt_blob->unpack_with_reexecution())); 606 607 __ bind(no_deopt); 608 __ stop("deopt not performed"); 609 610 return oop_maps; 611 } 612 613 614 OopMapSet* Runtime1::generate_code_for(StubID id, StubAssembler* sasm) { 615 616 const Register exception_oop = r0; 617 const Register exception_pc = r3; 618 619 // for better readability 620 const bool must_gc_arguments = true; 621 const bool dont_gc_arguments = false; 622 623 // default value; overwritten for some optimized stubs that are called from methods that do not use the fpu 624 bool save_fpu_registers = true; 625 626 // stub code & info for the different stubs 627 OopMapSet* oop_maps = nullptr; 628 OopMap* oop_map = nullptr; 629 switch (id) { 630 { 631 case forward_exception_id: 632 { 633 oop_maps = generate_handle_exception(id, sasm); 634 __ leave(); 635 __ ret(lr); 636 } 637 break; 638 639 case throw_div0_exception_id: 640 { StubFrame f(sasm, "throw_div0_exception", dont_gc_arguments, does_not_return); 641 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_div0_exception), false); 642 } 643 break; 644 645 case throw_null_pointer_exception_id: 646 { StubFrame f(sasm, "throw_null_pointer_exception", dont_gc_arguments, does_not_return); 647 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_null_pointer_exception), false); 648 } 649 break; 650 651 case new_instance_id: 652 case fast_new_instance_id: 653 case fast_new_instance_init_check_id: 654 { 655 Register klass = r3; // Incoming 656 Register obj = r0; // Result 657 658 if (id == new_instance_id) { 659 __ set_info("new_instance", dont_gc_arguments); 660 } else if (id == fast_new_instance_id) { 661 __ set_info("fast new_instance", dont_gc_arguments); 662 } else { 663 assert(id == fast_new_instance_init_check_id, "bad StubID"); 664 __ set_info("fast new_instance init check", dont_gc_arguments); 665 } 666 667 __ enter(); 668 OopMap* map = save_live_registers(sasm); 669 int call_offset; 670 call_offset = __ call_RT(obj, noreg, CAST_FROM_FN_PTR(address, new_instance), klass); 671 oop_maps = new OopMapSet(); 672 oop_maps->add_gc_map(call_offset, map); 673 restore_live_registers_except_r0(sasm); 674 __ verify_oop(obj); 675 __ leave(); 676 __ ret(lr); 677 678 // r0,: new instance 679 } 680 681 break; 682 683 case counter_overflow_id: 684 { 685 Register bci = r0, method = r1; 686 __ enter(); 687 OopMap* map = save_live_registers(sasm); 688 // Retrieve bci 689 __ ldrw(bci, Address(rfp, 2*BytesPerWord)); 690 // And a pointer to the Method* 691 __ ldr(method, Address(rfp, 3*BytesPerWord)); 692 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, counter_overflow), bci, method); 693 oop_maps = new OopMapSet(); 694 oop_maps->add_gc_map(call_offset, map); 695 restore_live_registers(sasm); 696 __ leave(); 697 __ ret(lr); 698 } 699 break; 700 701 case new_type_array_id: 702 case new_object_array_id: 703 case new_null_free_array_id: 704 { 705 Register length = r19; // Incoming 706 Register klass = r3; // Incoming 707 Register obj = r0; // Result 708 709 if (id == new_type_array_id) { 710 __ set_info("new_type_array", dont_gc_arguments); 711 } else if (id == new_object_array_id) { 712 __ set_info("new_object_array", dont_gc_arguments); 713 } else { 714 __ set_info("new_null_free_array", dont_gc_arguments); 715 } 716 717 #ifdef ASSERT 718 // assert object type is really an array of the proper kind 719 { 720 Label ok; 721 Register t0 = obj; 722 __ ldrw(t0, Address(klass, Klass::layout_helper_offset())); 723 __ asrw(t0, t0, Klass::_lh_array_tag_shift); 724 switch (id) { 725 case new_type_array_id: 726 __ cmpw(t0, Klass::_lh_array_tag_type_value); 727 __ br(Assembler::EQ, ok); 728 __ stop("assert(is a type array klass)"); 729 break; 730 case new_object_array_id: 731 __ cmpw(t0, Klass::_lh_array_tag_obj_value); // new "[Ljava/lang/Object;" 732 __ br(Assembler::EQ, ok); 733 __ cmpw(t0, Klass::_lh_array_tag_vt_value); // new "[LVT;" 734 __ br(Assembler::EQ, ok); 735 __ stop("assert(is an object or inline type array klass)"); 736 break; 737 case new_null_free_array_id: 738 __ cmpw(t0, Klass::_lh_array_tag_vt_value); // the array can be a flat array. 739 __ br(Assembler::EQ, ok); 740 __ cmpw(t0, Klass::_lh_array_tag_obj_value); // the array cannot be a flat array (due to InlineArrayElementMaxFlatSize, etc) 741 __ br(Assembler::EQ, ok); 742 __ stop("assert(is an object or inline type array klass)"); 743 break; 744 default: ShouldNotReachHere(); 745 } 746 __ should_not_reach_here(); 747 __ bind(ok); 748 } 749 #endif // ASSERT 750 751 __ enter(); 752 OopMap* map = save_live_registers(sasm); 753 int call_offset; 754 if (id == new_type_array_id) { 755 call_offset = __ call_RT(obj, noreg, CAST_FROM_FN_PTR(address, new_type_array), klass, length); 756 } else if (id == new_object_array_id) { 757 call_offset = __ call_RT(obj, noreg, CAST_FROM_FN_PTR(address, new_object_array), klass, length); 758 } else { 759 assert(id == new_null_free_array_id, "must be"); 760 call_offset = __ call_RT(obj, noreg, CAST_FROM_FN_PTR(address, new_null_free_array), klass, length); 761 } 762 763 oop_maps = new OopMapSet(); 764 oop_maps->add_gc_map(call_offset, map); 765 restore_live_registers_except_r0(sasm); 766 767 __ verify_oop(obj); 768 __ leave(); 769 __ ret(lr); 770 771 // r0: new array 772 } 773 break; 774 775 case new_multi_array_id: 776 { StubFrame f(sasm, "new_multi_array", dont_gc_arguments); 777 // r0,: klass 778 // r19,: rank 779 // r2: address of 1st dimension 780 OopMap* map = save_live_registers(sasm); 781 __ mov(c_rarg1, r0); 782 __ mov(c_rarg3, r2); 783 __ mov(c_rarg2, r19); 784 int call_offset = __ call_RT(r0, noreg, CAST_FROM_FN_PTR(address, new_multi_array), r1, r2, r3); 785 786 oop_maps = new OopMapSet(); 787 oop_maps->add_gc_map(call_offset, map); 788 restore_live_registers_except_r0(sasm); 789 790 // r0,: new multi array 791 __ verify_oop(r0); 792 } 793 break; 794 795 case buffer_inline_args_id: 796 case buffer_inline_args_no_receiver_id: 797 { 798 const char* name = (id == buffer_inline_args_id) ? 799 "buffer_inline_args" : "buffer_inline_args_no_receiver"; 800 StubFrame f(sasm, name, dont_gc_arguments); 801 OopMap* map = save_live_registers(sasm); 802 Register method = r19; // Incoming 803 address entry = (id == buffer_inline_args_id) ? 804 CAST_FROM_FN_PTR(address, buffer_inline_args) : 805 CAST_FROM_FN_PTR(address, buffer_inline_args_no_receiver); 806 // This is called from a C1 method's scalarized entry point 807 // where r0-r7 may be holding live argument values so we can't 808 // return the result in r0 as the other stubs do. LR is used as 809 // a temporay below to avoid the result being clobbered by 810 // restore_live_registers. 811 int call_offset = __ call_RT(lr, noreg, entry, method); 812 oop_maps = new OopMapSet(); 813 oop_maps->add_gc_map(call_offset, map); 814 restore_live_registers(sasm); 815 __ mov(r20, lr); 816 __ verify_oop(r20); // r20: an array of buffered value objects 817 } 818 break; 819 820 case load_flat_array_id: 821 { 822 StubFrame f(sasm, "load_flat_array", dont_gc_arguments); 823 OopMap* map = save_live_registers(sasm); 824 825 // Called with store_parameter and not C abi 826 827 f.load_argument(1, r0); // r0,: array 828 f.load_argument(0, r1); // r1,: index 829 int call_offset = __ call_RT(r0, noreg, CAST_FROM_FN_PTR(address, load_flat_array), r0, r1); 830 831 // Ensure the stores that initialize the buffer are visible 832 // before any subsequent store that publishes this reference. 833 __ membar(Assembler::StoreStore); 834 835 oop_maps = new OopMapSet(); 836 oop_maps->add_gc_map(call_offset, map); 837 restore_live_registers_except_r0(sasm); 838 839 // r0: loaded element at array[index] 840 __ verify_oop(r0); 841 } 842 break; 843 844 case store_flat_array_id: 845 { 846 StubFrame f(sasm, "store_flat_array", dont_gc_arguments); 847 OopMap* map = save_live_registers(sasm, 4); 848 849 // Called with store_parameter and not C abi 850 851 f.load_argument(2, r0); // r0: array 852 f.load_argument(1, r1); // r1: index 853 f.load_argument(0, r2); // r2: value 854 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, store_flat_array), r0, r1, r2); 855 856 oop_maps = new OopMapSet(); 857 oop_maps->add_gc_map(call_offset, map); 858 restore_live_registers_except_r0(sasm); 859 } 860 break; 861 862 case substitutability_check_id: 863 { 864 StubFrame f(sasm, "substitutability_check", dont_gc_arguments); 865 OopMap* map = save_live_registers(sasm); 866 867 // Called with store_parameter and not C abi 868 869 f.load_argument(1, r1); // r1,: left 870 f.load_argument(0, r2); // r2,: right 871 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, substitutability_check), r1, r2); 872 873 oop_maps = new OopMapSet(); 874 oop_maps->add_gc_map(call_offset, map); 875 restore_live_registers_except_r0(sasm); 876 877 // r0,: are the two operands substitutable 878 } 879 break; 880 881 case register_finalizer_id: 882 { 883 __ set_info("register_finalizer", dont_gc_arguments); 884 885 // This is called via call_runtime so the arguments 886 // will be place in C abi locations 887 888 __ verify_oop(c_rarg0); 889 890 // load the klass and check the has finalizer flag 891 Label register_finalizer; 892 Register t = r5; 893 __ load_klass(t, r0); 894 __ ldrw(t, Address(t, Klass::access_flags_offset())); 895 __ tbnz(t, exact_log2(JVM_ACC_HAS_FINALIZER), register_finalizer); 896 __ ret(lr); 897 898 __ bind(register_finalizer); 899 __ enter(); 900 OopMap* oop_map = save_live_registers(sasm); 901 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, SharedRuntime::register_finalizer), r0); 902 oop_maps = new OopMapSet(); 903 oop_maps->add_gc_map(call_offset, oop_map); 904 905 // Now restore all the live registers 906 restore_live_registers(sasm); 907 908 __ leave(); 909 __ ret(lr); 910 } 911 break; 912 913 case throw_class_cast_exception_id: 914 { StubFrame f(sasm, "throw_class_cast_exception", dont_gc_arguments, does_not_return); 915 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_class_cast_exception), true); 916 } 917 break; 918 919 case throw_incompatible_class_change_error_id: 920 { StubFrame f(sasm, "throw_incompatible_class_change_error", dont_gc_arguments, does_not_return); 921 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_incompatible_class_change_error), false); 922 } 923 break; 924 925 case throw_illegal_monitor_state_exception_id: 926 { StubFrame f(sasm, "throw_illegal_monitor_state_exception", dont_gc_arguments); 927 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_illegal_monitor_state_exception), false); 928 } 929 break; 930 931 case throw_identity_exception_id: 932 { StubFrame f(sasm, "throw_identity_exception", dont_gc_arguments); 933 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_identity_exception), true); 934 } 935 break; 936 937 case slow_subtype_check_id: 938 { 939 // Typical calling sequence: 940 // __ push(klass_RInfo); // object klass or other subclass 941 // __ push(sup_k_RInfo); // array element klass or other superclass 942 // __ bl(slow_subtype_check); 943 // Note that the subclass is pushed first, and is therefore deepest. 944 enum layout { 945 r0_off, r0_off_hi, 946 r2_off, r2_off_hi, 947 r4_off, r4_off_hi, 948 r5_off, r5_off_hi, 949 sup_k_off, sup_k_off_hi, 950 klass_off, klass_off_hi, 951 framesize, 952 result_off = sup_k_off 953 }; 954 955 __ set_info("slow_subtype_check", dont_gc_arguments); 956 __ push(RegSet::of(r0, r2, r4, r5), sp); 957 958 // This is called by pushing args and not with C abi 959 // __ ldr(r4, Address(sp, (klass_off) * VMRegImpl::stack_slot_size)); // subclass 960 // __ ldr(r0, Address(sp, (sup_k_off) * VMRegImpl::stack_slot_size)); // superclass 961 962 __ ldp(r4, r0, Address(sp, (sup_k_off) * VMRegImpl::stack_slot_size)); 963 964 Label miss; 965 __ check_klass_subtype_slow_path(r4, r0, r2, r5, nullptr, &miss); 966 967 // fallthrough on success: 968 __ mov(rscratch1, 1); 969 __ str(rscratch1, Address(sp, (result_off) * VMRegImpl::stack_slot_size)); // result 970 __ pop(RegSet::of(r0, r2, r4, r5), sp); 971 __ ret(lr); 972 973 __ bind(miss); 974 __ str(zr, Address(sp, (result_off) * VMRegImpl::stack_slot_size)); // result 975 __ pop(RegSet::of(r0, r2, r4, r5), sp); 976 __ ret(lr); 977 } 978 break; 979 980 case monitorenter_nofpu_id: 981 save_fpu_registers = false; 982 // fall through 983 case monitorenter_id: 984 { 985 StubFrame f(sasm, "monitorenter", dont_gc_arguments); 986 OopMap* map = save_live_registers(sasm, save_fpu_registers); 987 988 // Called with store_parameter and not C abi 989 990 f.load_argument(1, r0); // r0,: object 991 f.load_argument(0, r1); // r1,: lock address 992 993 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, monitorenter), r0, r1); 994 995 oop_maps = new OopMapSet(); 996 oop_maps->add_gc_map(call_offset, map); 997 restore_live_registers(sasm, save_fpu_registers); 998 } 999 break; 1000 1001 case monitorexit_nofpu_id: 1002 save_fpu_registers = false; 1003 // fall through 1004 case monitorexit_id: 1005 { 1006 StubFrame f(sasm, "monitorexit", dont_gc_arguments); 1007 OopMap* map = save_live_registers(sasm, save_fpu_registers); 1008 1009 // Called with store_parameter and not C abi 1010 1011 f.load_argument(0, r0); // r0,: lock address 1012 1013 // note: really a leaf routine but must setup last java sp 1014 // => use call_RT for now (speed can be improved by 1015 // doing last java sp setup manually) 1016 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, monitorexit), r0); 1017 1018 oop_maps = new OopMapSet(); 1019 oop_maps->add_gc_map(call_offset, map); 1020 restore_live_registers(sasm, save_fpu_registers); 1021 } 1022 break; 1023 1024 case deoptimize_id: 1025 { 1026 StubFrame f(sasm, "deoptimize", dont_gc_arguments, does_not_return); 1027 OopMap* oop_map = save_live_registers(sasm); 1028 f.load_argument(0, c_rarg1); 1029 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, deoptimize), c_rarg1); 1030 1031 oop_maps = new OopMapSet(); 1032 oop_maps->add_gc_map(call_offset, oop_map); 1033 restore_live_registers(sasm); 1034 DeoptimizationBlob* deopt_blob = SharedRuntime::deopt_blob(); 1035 assert(deopt_blob != nullptr, "deoptimization blob must have been created"); 1036 __ leave(); 1037 __ far_jump(RuntimeAddress(deopt_blob->unpack_with_reexecution())); 1038 } 1039 break; 1040 1041 case throw_range_check_failed_id: 1042 { StubFrame f(sasm, "range_check_failed", dont_gc_arguments, does_not_return); 1043 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_range_check_exception), true); 1044 } 1045 break; 1046 1047 case unwind_exception_id: 1048 { __ set_info("unwind_exception", dont_gc_arguments); 1049 // note: no stubframe since we are about to leave the current 1050 // activation and we are calling a leaf VM function only. 1051 generate_unwind_exception(sasm); 1052 } 1053 break; 1054 1055 case access_field_patching_id: 1056 { StubFrame f(sasm, "access_field_patching", dont_gc_arguments, does_not_return); 1057 // we should set up register map 1058 oop_maps = generate_patching(sasm, CAST_FROM_FN_PTR(address, access_field_patching)); 1059 } 1060 break; 1061 1062 case load_klass_patching_id: 1063 { StubFrame f(sasm, "load_klass_patching", dont_gc_arguments, does_not_return); 1064 // we should set up register map 1065 oop_maps = generate_patching(sasm, CAST_FROM_FN_PTR(address, move_klass_patching)); 1066 } 1067 break; 1068 1069 case load_mirror_patching_id: 1070 { StubFrame f(sasm, "load_mirror_patching", dont_gc_arguments, does_not_return); 1071 // we should set up register map 1072 oop_maps = generate_patching(sasm, CAST_FROM_FN_PTR(address, move_mirror_patching)); 1073 } 1074 break; 1075 1076 case load_appendix_patching_id: 1077 { StubFrame f(sasm, "load_appendix_patching", dont_gc_arguments, does_not_return); 1078 // we should set up register map 1079 oop_maps = generate_patching(sasm, CAST_FROM_FN_PTR(address, move_appendix_patching)); 1080 } 1081 break; 1082 1083 case handle_exception_nofpu_id: 1084 case handle_exception_id: 1085 { StubFrame f(sasm, "handle_exception", dont_gc_arguments); 1086 oop_maps = generate_handle_exception(id, sasm); 1087 } 1088 break; 1089 1090 case handle_exception_from_callee_id: 1091 { StubFrame f(sasm, "handle_exception_from_callee", dont_gc_arguments); 1092 oop_maps = generate_handle_exception(id, sasm); 1093 } 1094 break; 1095 1096 case throw_index_exception_id: 1097 { StubFrame f(sasm, "index_range_check_failed", dont_gc_arguments, does_not_return); 1098 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_index_exception), true); 1099 } 1100 break; 1101 1102 case throw_array_store_exception_id: 1103 { StubFrame f(sasm, "throw_array_store_exception", dont_gc_arguments, does_not_return); 1104 // tos + 0: link 1105 // + 1: return address 1106 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_array_store_exception), true); 1107 } 1108 break; 1109 1110 case predicate_failed_trap_id: 1111 { 1112 StubFrame f(sasm, "predicate_failed_trap", dont_gc_arguments, does_not_return); 1113 1114 OopMap* map = save_live_registers(sasm); 1115 1116 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, predicate_failed_trap)); 1117 oop_maps = new OopMapSet(); 1118 oop_maps->add_gc_map(call_offset, map); 1119 restore_live_registers(sasm); 1120 __ leave(); 1121 DeoptimizationBlob* deopt_blob = SharedRuntime::deopt_blob(); 1122 assert(deopt_blob != nullptr, "deoptimization blob must have been created"); 1123 1124 __ far_jump(RuntimeAddress(deopt_blob->unpack_with_reexecution())); 1125 } 1126 break; 1127 1128 case dtrace_object_alloc_id: 1129 { // c_rarg0: object 1130 StubFrame f(sasm, "dtrace_object_alloc", dont_gc_arguments); 1131 save_live_registers(sasm); 1132 1133 __ call_VM_leaf(CAST_FROM_FN_PTR(address, static_cast<int (*)(oopDesc*)>(SharedRuntime::dtrace_object_alloc)), c_rarg0); 1134 1135 restore_live_registers(sasm); 1136 } 1137 break; 1138 1139 default: 1140 // FIXME: For unhandled trap_id this code fails with assert during vm intialization 1141 // rather than insert a call to unimplemented_entry 1142 { StubFrame f(sasm, "unimplemented entry", dont_gc_arguments, does_not_return); 1143 __ mov(r0, (int)id); 1144 __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, unimplemented_entry), r0); 1145 } 1146 break; 1147 } 1148 } 1149 1150 1151 return oop_maps; 1152 } 1153 1154 #undef __ 1155 1156 const char *Runtime1::pd_name_for_address(address entry) { Unimplemented(); return 0; }