1 /* 2 * Copyright (c) 1999, 2022, 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/compiledICHolder.hpp" 42 #include "oops/oop.inline.hpp" 43 #include "prims/jvmtiExport.hpp" 44 #include "register_aarch64.hpp" 45 #include "runtime/sharedRuntime.hpp" 46 #include "runtime/signature.hpp" 47 #include "runtime/stubRoutines.hpp" 48 #include "runtime/vframe.hpp" 49 #include "runtime/vframeArray.hpp" 50 #include "utilities/powerOfTwo.hpp" 51 #include "vmreg_aarch64.inline.hpp" 52 53 54 // Implementation of StubAssembler 55 56 int StubAssembler::call_RT(Register oop_result1, Register metadata_result, address entry, int args_size) { 57 // setup registers 58 assert(!(oop_result1->is_valid() || metadata_result->is_valid()) || oop_result1 != metadata_result, "registers must be different"); 59 assert(oop_result1 != rthread && metadata_result != rthread, "registers must be different"); 60 assert(args_size >= 0, "illegal args_size"); 61 bool align_stack = false; 62 63 mov(c_rarg0, rthread); 64 set_num_rt_args(0); // Nothing on stack 65 66 Label retaddr; 67 set_last_Java_frame(sp, rfp, retaddr, rscratch1); 68 69 // do the call 70 lea(rscratch1, RuntimeAddress(entry)); 71 blr(rscratch1); 72 bind(retaddr); 73 int call_offset = offset(); 74 // verify callee-saved register 75 #ifdef ASSERT 76 push(r0, sp); 77 { Label L; 78 get_thread(r0); 79 cmp(rthread, r0); 80 br(Assembler::EQ, L); 81 stop("StubAssembler::call_RT: rthread not callee saved?"); 82 bind(L); 83 } 84 pop(r0, sp); 85 #endif 86 reset_last_Java_frame(true); 87 88 // check for pending exceptions 89 { Label L; 90 // check for pending exceptions (java_thread is set upon return) 91 ldr(rscratch1, Address(rthread, in_bytes(Thread::pending_exception_offset()))); 92 cbz(rscratch1, L); 93 // exception pending => remove activation and forward to exception handler 94 // make sure that the vm_results are cleared 95 if (oop_result1->is_valid()) { 96 str(zr, Address(rthread, JavaThread::vm_result_offset())); 97 } 98 if (metadata_result->is_valid()) { 99 str(zr, Address(rthread, JavaThread::vm_result_2_offset())); 100 } 101 if (frame_size() == no_frame_size) { 102 leave(); 103 far_jump(RuntimeAddress(StubRoutines::forward_exception_entry())); 104 } else if (_stub_id == Runtime1::forward_exception_id) { 105 should_not_reach_here(); 106 } else { 107 far_jump(RuntimeAddress(Runtime1::entry_for(Runtime1::forward_exception_id))); 108 } 109 bind(L); 110 } 111 // get oop results if there are any and reset the values in the thread 112 if (oop_result1->is_valid()) { 113 get_vm_result(oop_result1, rthread); 114 } 115 if (metadata_result->is_valid()) { 116 get_vm_result_2(metadata_result, rthread); 117 } 118 return call_offset; 119 } 120 121 122 int StubAssembler::call_RT(Register oop_result1, Register metadata_result, address entry, Register arg1) { 123 mov(c_rarg1, arg1); 124 return call_RT(oop_result1, metadata_result, entry, 1); 125 } 126 127 128 int StubAssembler::call_RT(Register oop_result1, Register metadata_result, address entry, Register arg1, Register arg2) { 129 if (c_rarg1 == arg2) { 130 if (c_rarg2 == arg1) { 131 mov(rscratch1, arg1); 132 mov(arg1, arg2); 133 mov(arg2, rscratch1); 134 } else { 135 mov(c_rarg2, arg2); 136 mov(c_rarg1, arg1); 137 } 138 } else { 139 mov(c_rarg1, arg1); 140 mov(c_rarg2, arg2); 141 } 142 return call_RT(oop_result1, metadata_result, entry, 2); 143 } 144 145 146 int StubAssembler::call_RT(Register oop_result1, Register metadata_result, address entry, Register arg1, Register arg2, Register arg3) { 147 // if there is any conflict use the stack 148 if (arg1 == c_rarg2 || arg1 == c_rarg3 || 149 arg2 == c_rarg1 || arg2 == c_rarg3 || 150 arg3 == c_rarg1 || arg3 == c_rarg2) { 151 stp(arg3, arg2, Address(pre(sp, -2 * wordSize))); 152 stp(arg1, zr, Address(pre(sp, -2 * wordSize))); 153 ldp(c_rarg1, zr, Address(post(sp, 2 * wordSize))); 154 ldp(c_rarg3, c_rarg2, Address(post(sp, 2 * wordSize))); 155 } else { 156 mov(c_rarg1, arg1); 157 mov(c_rarg2, arg2); 158 mov(c_rarg3, arg3); 159 } 160 return call_RT(oop_result1, metadata_result, entry, 3); 161 } 162 163 enum return_state_t { 164 does_not_return, requires_return 165 }; 166 167 168 // Implementation of StubFrame 169 170 class StubFrame: public StackObj { 171 private: 172 StubAssembler* _sasm; 173 bool _return_state; 174 175 public: 176 StubFrame(StubAssembler* sasm, const char* name, bool must_gc_arguments, return_state_t return_state=requires_return); 177 void load_argument(int offset_in_words, Register reg); 178 179 ~StubFrame(); 180 };; 181 182 void StubAssembler::prologue(const char* name, bool must_gc_arguments) { 183 set_info(name, must_gc_arguments); 184 enter(); 185 } 186 187 void StubAssembler::epilogue() { 188 leave(); 189 ret(lr); 190 } 191 192 #define __ _sasm-> 193 194 StubFrame::StubFrame(StubAssembler* sasm, const char* name, bool must_gc_arguments, return_state_t return_state) { 195 _sasm = sasm; 196 _return_state = return_state; 197 __ prologue(name, must_gc_arguments); 198 } 199 200 // load parameters that were stored with LIR_Assembler::store_parameter 201 // Note: offsets for store_parameter and load_argument must match 202 void StubFrame::load_argument(int offset_in_words, Register reg) { 203 __ load_parameter(offset_in_words, reg); 204 } 205 206 StubFrame::~StubFrame() { 207 if (_return_state == requires_return) { 208 __ epilogue(); 209 } else { 210 __ should_not_reach_here(); 211 } 212 } 213 214 #undef __ 215 216 217 // Implementation of Runtime1 218 219 #define __ sasm-> 220 221 const int float_regs_as_doubles_size_in_slots = pd_nof_fpu_regs_frame_map * 2; 222 223 // Stack layout for saving/restoring all the registers needed during a runtime 224 // call (this includes deoptimization) 225 // Note: note that users of this frame may well have arguments to some runtime 226 // while these values are on the stack. These positions neglect those arguments 227 // but the code in save_live_registers will take the argument count into 228 // account. 229 // 230 231 enum reg_save_layout { 232 reg_save_frame_size = 32 /* float */ + 32 /* integer */ 233 }; 234 235 // Save off registers which might be killed by calls into the runtime. 236 // Tries to smart of about FP registers. In particular we separate 237 // saving and describing the FPU registers for deoptimization since we 238 // have to save the FPU registers twice if we describe them. The 239 // deopt blob is the only thing which needs to describe FPU registers. 240 // In all other cases it should be sufficient to simply save their 241 // current value. 242 243 static int cpu_reg_save_offsets[FrameMap::nof_cpu_regs]; 244 static int fpu_reg_save_offsets[FrameMap::nof_fpu_regs]; 245 static int reg_save_size_in_words; 246 static int frame_size_in_bytes = -1; 247 248 static OopMap* generate_oop_map(StubAssembler* sasm, bool save_fpu_registers) { 249 int frame_size_in_bytes = reg_save_frame_size * BytesPerWord; 250 sasm->set_frame_size(frame_size_in_bytes / BytesPerWord); 251 int frame_size_in_slots = frame_size_in_bytes / sizeof(jint); 252 OopMap* oop_map = new OopMap(frame_size_in_slots, 0); 253 254 for (int i = 0; i < FrameMap::nof_cpu_regs; i++) { 255 Register r = as_Register(i); 256 if (i <= 18 && i != rscratch1->encoding() && i != rscratch2->encoding()) { 257 int sp_offset = cpu_reg_save_offsets[i]; 258 oop_map->set_callee_saved(VMRegImpl::stack2reg(sp_offset), 259 r->as_VMReg()); 260 } 261 } 262 263 if (save_fpu_registers) { 264 for (int i = 0; i < FrameMap::nof_fpu_regs; i++) { 265 FloatRegister r = as_FloatRegister(i); 266 { 267 int sp_offset = fpu_reg_save_offsets[i]; 268 oop_map->set_callee_saved(VMRegImpl::stack2reg(sp_offset), 269 r->as_VMReg()); 270 } 271 } 272 } 273 return oop_map; 274 } 275 276 static void save_live_registers_no_oop_map(StubAssembler* sasm, 277 bool save_fpu_registers = true) { 278 __ block_comment("save_live_registers"); 279 280 __ push(RegSet::range(r0, r29), sp); // integer registers except lr & sp 281 282 if (save_fpu_registers) { 283 for (int i = 31; i>= 0; i -= 4) { 284 __ sub(sp, sp, 4 * wordSize); // no pre-increment for st1. Emulate it without modifying other registers 285 __ st1(as_FloatRegister(i-3), as_FloatRegister(i-2), as_FloatRegister(i-1), 286 as_FloatRegister(i), __ T1D, Address(sp)); 287 } 288 } else { 289 __ add(sp, sp, -32 * wordSize); 290 } 291 } 292 293 static OopMap* save_live_registers(StubAssembler* sasm, 294 bool save_fpu_registers = true) { 295 save_live_registers_no_oop_map(sasm, save_fpu_registers); 296 return generate_oop_map(sasm, save_fpu_registers); 297 } 298 299 static void restore_live_registers(StubAssembler* sasm, bool restore_fpu_registers = true) { 300 if (restore_fpu_registers) { 301 for (int i = 0; i < 32; i += 4) 302 __ ld1(as_FloatRegister(i), as_FloatRegister(i+1), as_FloatRegister(i+2), 303 as_FloatRegister(i+3), __ T1D, Address(__ post(sp, 4 * wordSize))); 304 } else { 305 __ add(sp, sp, 32 * wordSize); 306 } 307 308 __ pop(RegSet::range(r0, r29), sp); 309 } 310 311 static void restore_live_registers_except_r0(StubAssembler* sasm, bool restore_fpu_registers = true) { 312 313 if (restore_fpu_registers) { 314 for (int i = 0; i < 32; i += 4) 315 __ ld1(as_FloatRegister(i), as_FloatRegister(i+1), as_FloatRegister(i+2), 316 as_FloatRegister(i+3), __ T1D, Address(__ post(sp, 4 * wordSize))); 317 } else { 318 __ add(sp, sp, 32 * wordSize); 319 } 320 321 __ ldp(zr, r1, Address(__ post(sp, 16))); 322 __ pop(RegSet::range(r2, r29), sp); 323 } 324 325 326 327 void Runtime1::initialize_pd() { 328 int i; 329 int sp_offset = 0; 330 331 // all float registers are saved explicitly 332 assert(FrameMap::nof_fpu_regs == 32, "double registers not handled here"); 333 for (i = 0; i < FrameMap::nof_fpu_regs; i++) { 334 fpu_reg_save_offsets[i] = sp_offset; 335 sp_offset += 2; // SP offsets are in halfwords 336 } 337 338 for (i = 0; i < FrameMap::nof_cpu_regs; i++) { 339 Register r = as_Register(i); 340 cpu_reg_save_offsets[i] = sp_offset; 341 sp_offset += 2; // SP offsets are in halfwords 342 } 343 } 344 345 346 // target: the entry point of the method that creates and posts the exception oop 347 // has_argument: true if the exception needs arguments (passed in rscratch1 and rscratch2) 348 349 OopMapSet* Runtime1::generate_exception_throw(StubAssembler* sasm, address target, bool has_argument) { 350 // make a frame and preserve the caller's caller-save registers 351 OopMap* oop_map = save_live_registers(sasm); 352 int call_offset; 353 if (!has_argument) { 354 call_offset = __ call_RT(noreg, noreg, target); 355 } else { 356 __ mov(c_rarg1, rscratch1); 357 __ mov(c_rarg2, rscratch2); 358 call_offset = __ call_RT(noreg, noreg, target); 359 } 360 OopMapSet* oop_maps = new OopMapSet(); 361 oop_maps->add_gc_map(call_offset, oop_map); 362 return oop_maps; 363 } 364 365 366 OopMapSet* Runtime1::generate_handle_exception(StubID id, StubAssembler *sasm) { 367 __ block_comment("generate_handle_exception"); 368 369 // incoming parameters 370 const Register exception_oop = r0; 371 const Register exception_pc = r3; 372 // other registers used in this stub 373 374 // Save registers, if required. 375 OopMapSet* oop_maps = new OopMapSet(); 376 OopMap* oop_map = NULL; 377 switch (id) { 378 case forward_exception_id: 379 // We're handling an exception in the context of a compiled frame. 380 // The registers have been saved in the standard places. Perform 381 // an exception lookup in the caller and dispatch to the handler 382 // if found. Otherwise unwind and dispatch to the callers 383 // exception handler. 384 oop_map = generate_oop_map(sasm, 1 /*thread*/); 385 386 // load and clear pending exception oop into r0 387 __ ldr(exception_oop, Address(rthread, Thread::pending_exception_offset())); 388 __ str(zr, Address(rthread, Thread::pending_exception_offset())); 389 390 // load issuing PC (the return address for this stub) into r3 391 __ ldr(exception_pc, Address(rfp, 1*BytesPerWord)); 392 __ authenticate_return_address(exception_pc, rscratch1); 393 394 // make sure that the vm_results are cleared (may be unnecessary) 395 __ str(zr, Address(rthread, JavaThread::vm_result_offset())); 396 __ str(zr, Address(rthread, JavaThread::vm_result_2_offset())); 397 break; 398 case handle_exception_nofpu_id: 399 case handle_exception_id: 400 // At this point all registers MAY be live. 401 oop_map = save_live_registers(sasm, id != handle_exception_nofpu_id); 402 break; 403 case handle_exception_from_callee_id: { 404 // At this point all registers except exception oop (r0) and 405 // exception pc (lr) are dead. 406 const int frame_size = 2 /*fp, return address*/; 407 oop_map = new OopMap(frame_size * VMRegImpl::slots_per_word, 0); 408 sasm->set_frame_size(frame_size); 409 break; 410 } 411 default: ShouldNotReachHere(); 412 } 413 414 // verify that only r0 and r3 are valid at this time 415 __ invalidate_registers(false, true, true, false, true, true); 416 // verify that r0 contains a valid exception 417 __ verify_not_null_oop(exception_oop); 418 419 #ifdef ASSERT 420 // check that fields in JavaThread for exception oop and issuing pc are 421 // empty before writing to them 422 Label oop_empty; 423 __ ldr(rscratch1, Address(rthread, JavaThread::exception_oop_offset())); 424 __ cbz(rscratch1, oop_empty); 425 __ stop("exception oop already set"); 426 __ bind(oop_empty); 427 428 Label pc_empty; 429 __ ldr(rscratch1, Address(rthread, JavaThread::exception_pc_offset())); 430 __ cbz(rscratch1, pc_empty); 431 __ stop("exception pc already set"); 432 __ bind(pc_empty); 433 #endif 434 435 // save exception oop and issuing pc into JavaThread 436 // (exception handler will load it from here) 437 __ str(exception_oop, Address(rthread, JavaThread::exception_oop_offset())); 438 __ str(exception_pc, Address(rthread, JavaThread::exception_pc_offset())); 439 440 // patch throwing pc into return address (has bci & oop map) 441 __ protect_return_address(exception_pc, rscratch1); 442 __ str(exception_pc, Address(rfp, 1*BytesPerWord)); 443 444 // compute the exception handler. 445 // the exception oop and the throwing pc are read from the fields in JavaThread 446 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, exception_handler_for_pc)); 447 oop_maps->add_gc_map(call_offset, oop_map); 448 449 // r0: handler address 450 // will be the deopt blob if nmethod was deoptimized while we looked up 451 // handler regardless of whether handler existed in the nmethod. 452 453 // only r0 is valid at this time, all other registers have been destroyed by the runtime call 454 __ invalidate_registers(false, true, true, true, true, true); 455 456 // patch the return address, this stub will directly return to the exception handler 457 __ protect_return_address(r0, rscratch1); 458 __ str(r0, Address(rfp, 1*BytesPerWord)); 459 460 switch (id) { 461 case forward_exception_id: 462 case handle_exception_nofpu_id: 463 case handle_exception_id: 464 // Restore the registers that were saved at the beginning. 465 restore_live_registers(sasm, id != handle_exception_nofpu_id); 466 break; 467 case handle_exception_from_callee_id: 468 break; 469 default: ShouldNotReachHere(); 470 } 471 472 return oop_maps; 473 } 474 475 476 void Runtime1::generate_unwind_exception(StubAssembler *sasm) { 477 // incoming parameters 478 const Register exception_oop = r0; 479 // callee-saved copy of exception_oop during runtime call 480 const Register exception_oop_callee_saved = r19; 481 // other registers used in this stub 482 const Register exception_pc = r3; 483 const Register handler_addr = r1; 484 485 // verify that only r0, is valid at this time 486 __ invalidate_registers(false, true, true, true, true, true); 487 488 #ifdef ASSERT 489 // check that fields in JavaThread for exception oop and issuing pc are empty 490 Label oop_empty; 491 __ ldr(rscratch1, Address(rthread, JavaThread::exception_oop_offset())); 492 __ cbz(rscratch1, oop_empty); 493 __ stop("exception oop must be empty"); 494 __ bind(oop_empty); 495 496 Label pc_empty; 497 __ ldr(rscratch1, Address(rthread, JavaThread::exception_pc_offset())); 498 __ cbz(rscratch1, pc_empty); 499 __ stop("exception pc must be empty"); 500 __ bind(pc_empty); 501 #endif 502 503 // Save our return address because 504 // exception_handler_for_return_address will destroy it. We also 505 // save exception_oop 506 __ mov(r3, lr); 507 __ protect_return_address(); 508 __ stp(lr, exception_oop, Address(__ pre(sp, -2 * wordSize))); 509 510 // search the exception handler address of the caller (using the return address) 511 __ call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::exception_handler_for_return_address), rthread, r3); 512 // r0: exception handler address of the caller 513 514 // Only R0 is valid at this time; all other registers have been 515 // destroyed by the call. 516 __ invalidate_registers(false, true, true, true, false, true); 517 518 // move result of call into correct register 519 __ mov(handler_addr, r0); 520 521 // get throwing pc (= return address). 522 // lr has been destroyed by the call 523 __ ldp(lr, exception_oop, Address(__ post(sp, 2 * wordSize))); 524 __ authenticate_return_address(); 525 __ mov(r3, lr); 526 527 __ verify_not_null_oop(exception_oop); 528 529 // continue at exception handler (return address removed) 530 // note: do *not* remove arguments when unwinding the 531 // activation since the caller assumes having 532 // all arguments on the stack when entering the 533 // runtime to determine the exception handler 534 // (GC happens at call site with arguments!) 535 // r0: exception oop 536 // r3: throwing pc 537 // r1: exception handler 538 __ br(handler_addr); 539 } 540 541 542 543 OopMapSet* Runtime1::generate_patching(StubAssembler* sasm, address target) { 544 // use the maximum number of runtime-arguments here because it is difficult to 545 // distinguish each RT-Call. 546 // Note: This number affects also the RT-Call in generate_handle_exception because 547 // the oop-map is shared for all calls. 548 DeoptimizationBlob* deopt_blob = SharedRuntime::deopt_blob(); 549 assert(deopt_blob != NULL, "deoptimization blob must have been created"); 550 551 OopMap* oop_map = save_live_registers(sasm); 552 553 __ mov(c_rarg0, rthread); 554 Label retaddr; 555 __ set_last_Java_frame(sp, rfp, retaddr, rscratch1); 556 // do the call 557 __ lea(rscratch1, RuntimeAddress(target)); 558 __ blr(rscratch1); 559 __ bind(retaddr); 560 OopMapSet* oop_maps = new OopMapSet(); 561 oop_maps->add_gc_map(__ offset(), oop_map); 562 // verify callee-saved register 563 #ifdef ASSERT 564 { Label L; 565 __ get_thread(rscratch1); 566 __ cmp(rthread, rscratch1); 567 __ br(Assembler::EQ, L); 568 __ stop("StubAssembler::call_RT: rthread not callee saved?"); 569 __ bind(L); 570 } 571 #endif 572 573 __ reset_last_Java_frame(true); 574 575 #ifdef ASSERT 576 // check that fields in JavaThread for exception oop and issuing pc are empty 577 Label oop_empty; 578 __ ldr(rscratch1, Address(rthread, Thread::pending_exception_offset())); 579 __ cbz(rscratch1, oop_empty); 580 __ stop("exception oop must be empty"); 581 __ bind(oop_empty); 582 583 Label pc_empty; 584 __ ldr(rscratch1, Address(rthread, JavaThread::exception_pc_offset())); 585 __ cbz(rscratch1, pc_empty); 586 __ stop("exception pc must be empty"); 587 __ bind(pc_empty); 588 #endif 589 590 // Runtime will return true if the nmethod has been deoptimized, this is the 591 // expected scenario and anything else is an error. Note that we maintain a 592 // check on the result purely as a defensive measure. 593 Label no_deopt; 594 __ cbz(r0, no_deopt); // Have we deoptimized? 595 596 // Perform a re-execute. The proper return address is already on the stack, 597 // we just need to restore registers, pop all of our frame but the return 598 // address and jump to the deopt blob. 599 restore_live_registers(sasm); 600 __ leave(); 601 __ far_jump(RuntimeAddress(deopt_blob->unpack_with_reexecution())); 602 603 __ bind(no_deopt); 604 __ stop("deopt not performed"); 605 606 return oop_maps; 607 } 608 609 610 OopMapSet* Runtime1::generate_code_for(StubID id, StubAssembler* sasm) { 611 612 const Register exception_oop = r0; 613 const Register exception_pc = r3; 614 615 // for better readability 616 const bool must_gc_arguments = true; 617 const bool dont_gc_arguments = false; 618 619 // default value; overwritten for some optimized stubs that are called from methods that do not use the fpu 620 bool save_fpu_registers = true; 621 622 // stub code & info for the different stubs 623 OopMapSet* oop_maps = NULL; 624 OopMap* oop_map = NULL; 625 switch (id) { 626 { 627 case forward_exception_id: 628 { 629 oop_maps = generate_handle_exception(id, sasm); 630 __ leave(); 631 __ ret(lr); 632 } 633 break; 634 635 case throw_div0_exception_id: 636 { StubFrame f(sasm, "throw_div0_exception", dont_gc_arguments, does_not_return); 637 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_div0_exception), false); 638 } 639 break; 640 641 case throw_null_pointer_exception_id: 642 { StubFrame f(sasm, "throw_null_pointer_exception", dont_gc_arguments, does_not_return); 643 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_null_pointer_exception), false); 644 } 645 break; 646 647 case new_instance_id: 648 case fast_new_instance_id: 649 case fast_new_instance_init_check_id: 650 { 651 Register klass = r3; // Incoming 652 Register obj = r0; // Result 653 654 if (id == new_instance_id) { 655 __ set_info("new_instance", dont_gc_arguments); 656 } else if (id == fast_new_instance_id) { 657 __ set_info("fast new_instance", dont_gc_arguments); 658 } else { 659 assert(id == fast_new_instance_init_check_id, "bad StubID"); 660 __ set_info("fast new_instance init check", dont_gc_arguments); 661 } 662 663 // If TLAB is disabled, see if there is support for inlining contiguous 664 // allocations. 665 // Otherwise, just go to the slow path. 666 if ((id == fast_new_instance_id || id == fast_new_instance_init_check_id) && 667 !UseTLAB && Universe::heap()->supports_inline_contig_alloc()) { 668 Label slow_path; 669 Register obj_size = r19; 670 Register t1 = r10; 671 Register t2 = r11; 672 assert_different_registers(klass, obj, obj_size, t1, t2); 673 674 __ stp(r19, zr, Address(__ pre(sp, -2 * wordSize))); 675 676 if (id == fast_new_instance_init_check_id) { 677 // make sure the klass is initialized 678 __ ldrb(rscratch1, Address(klass, InstanceKlass::init_state_offset())); 679 __ cmpw(rscratch1, InstanceKlass::fully_initialized); 680 __ br(Assembler::NE, slow_path); 681 } 682 683 #ifdef ASSERT 684 // assert object can be fast path allocated 685 { 686 Label ok, not_ok; 687 __ ldrw(obj_size, Address(klass, Klass::layout_helper_offset())); 688 __ cmp(obj_size, (u1)0); 689 __ br(Assembler::LE, not_ok); // make sure it's an instance (LH > 0) 690 __ tstw(obj_size, Klass::_lh_instance_slow_path_bit); 691 __ br(Assembler::EQ, ok); 692 __ bind(not_ok); 693 __ stop("assert(can be fast path allocated)"); 694 __ should_not_reach_here(); 695 __ bind(ok); 696 } 697 #endif // ASSERT 698 699 // get the instance size (size is positive so movl is fine for 64bit) 700 __ ldrw(obj_size, Address(klass, Klass::layout_helper_offset())); 701 702 __ eden_allocate(obj, obj_size, 0, t1, slow_path); 703 704 __ initialize_object(obj, klass, obj_size, 0, t1, t2, /* is_tlab_allocated */ false); 705 __ verify_oop(obj); 706 __ ldp(r19, zr, Address(__ post(sp, 2 * wordSize))); 707 __ ret(lr); 708 709 __ bind(slow_path); 710 __ ldp(r19, zr, Address(__ post(sp, 2 * wordSize))); 711 } 712 713 __ enter(); 714 OopMap* map = save_live_registers(sasm); 715 int call_offset = __ call_RT(obj, noreg, CAST_FROM_FN_PTR(address, new_instance), klass); 716 oop_maps = new OopMapSet(); 717 oop_maps->add_gc_map(call_offset, map); 718 restore_live_registers_except_r0(sasm); 719 __ verify_oop(obj); 720 __ leave(); 721 __ ret(lr); 722 723 // r0,: new instance 724 } 725 726 break; 727 728 case load_klass_id: 729 { 730 StubFrame f(sasm, "load_klass", dont_gc_arguments); 731 save_live_registers_no_oop_map(sasm, true); 732 f.load_argument(0, r0); // obj 733 __ call_VM_leaf(CAST_FROM_FN_PTR(address, oopDesc::load_nklass_runtime), r0); 734 restore_live_registers_except_r0(sasm, true); 735 } 736 break; 737 738 case counter_overflow_id: 739 { 740 Register bci = r0, method = r1; 741 __ enter(); 742 OopMap* map = save_live_registers(sasm); 743 // Retrieve bci 744 __ ldrw(bci, Address(rfp, 2*BytesPerWord)); 745 // And a pointer to the Method* 746 __ ldr(method, Address(rfp, 3*BytesPerWord)); 747 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, counter_overflow), bci, method); 748 oop_maps = new OopMapSet(); 749 oop_maps->add_gc_map(call_offset, map); 750 restore_live_registers(sasm); 751 __ leave(); 752 __ ret(lr); 753 } 754 break; 755 756 case new_type_array_id: 757 case new_object_array_id: 758 { 759 Register length = r19; // Incoming 760 Register klass = r3; // Incoming 761 Register obj = r0; // Result 762 763 if (id == new_type_array_id) { 764 __ set_info("new_type_array", dont_gc_arguments); 765 } else { 766 __ set_info("new_object_array", dont_gc_arguments); 767 } 768 769 #ifdef ASSERT 770 // assert object type is really an array of the proper kind 771 { 772 Label ok; 773 Register t0 = obj; 774 __ ldrw(t0, Address(klass, Klass::layout_helper_offset())); 775 __ asrw(t0, t0, Klass::_lh_array_tag_shift); 776 int tag = ((id == new_type_array_id) 777 ? Klass::_lh_array_tag_type_value 778 : Klass::_lh_array_tag_obj_value); 779 __ mov(rscratch1, tag); 780 __ cmpw(t0, rscratch1); 781 __ br(Assembler::EQ, ok); 782 __ stop("assert(is an array klass)"); 783 __ should_not_reach_here(); 784 __ bind(ok); 785 } 786 #endif // ASSERT 787 788 // If TLAB is disabled, see if there is support for inlining contiguous 789 // allocations. 790 // Otherwise, just go to the slow path. 791 if (!UseTLAB && Universe::heap()->supports_inline_contig_alloc()) { 792 Register arr_size = r5; 793 Register t1 = r10; 794 Register t2 = r11; 795 Label slow_path; 796 assert_different_registers(length, klass, obj, arr_size, t1, t2); 797 798 // check that array length is small enough for fast path. 799 __ mov(rscratch1, C1_MacroAssembler::max_array_allocation_length); 800 __ cmpw(length, rscratch1); 801 __ br(Assembler::HI, slow_path); 802 803 // get the allocation size: round_up(hdr + length << (layout_helper & 0x1F)) 804 // since size is positive ldrw does right thing on 64bit 805 __ ldrw(t1, Address(klass, Klass::layout_helper_offset())); 806 // since size is positive movw does right thing on 64bit 807 __ movw(arr_size, length); 808 __ lslvw(arr_size, length, t1); 809 __ ubfx(t1, t1, Klass::_lh_header_size_shift, 810 exact_log2(Klass::_lh_header_size_mask + 1)); 811 __ add(arr_size, arr_size, t1); 812 __ add(arr_size, arr_size, MinObjAlignmentInBytesMask); // align up 813 __ andr(arr_size, arr_size, ~MinObjAlignmentInBytesMask); 814 815 __ eden_allocate(obj, arr_size, 0, t1, slow_path); // preserves arr_size 816 817 __ initialize_header(obj, klass, length, t1, t2); 818 __ ldrb(t1, Address(klass, in_bytes(Klass::layout_helper_offset()) + (Klass::_lh_header_size_shift / BitsPerByte))); 819 assert(Klass::_lh_header_size_shift % BitsPerByte == 0, "bytewise"); 820 assert(Klass::_lh_header_size_mask <= 0xFF, "bytewise"); 821 __ andr(t1, t1, Klass::_lh_header_size_mask); 822 __ sub(arr_size, arr_size, t1); // body length 823 __ add(t1, t1, obj); // body start 824 __ initialize_body(t1, arr_size, 0, t1, t2); 825 __ membar(Assembler::StoreStore); 826 __ verify_oop(obj); 827 828 __ ret(lr); 829 830 __ bind(slow_path); 831 } 832 833 __ enter(); 834 OopMap* map = save_live_registers(sasm); 835 int call_offset; 836 if (id == new_type_array_id) { 837 call_offset = __ call_RT(obj, noreg, CAST_FROM_FN_PTR(address, new_type_array), klass, length); 838 } else { 839 call_offset = __ call_RT(obj, noreg, CAST_FROM_FN_PTR(address, new_object_array), klass, length); 840 } 841 842 oop_maps = new OopMapSet(); 843 oop_maps->add_gc_map(call_offset, map); 844 restore_live_registers_except_r0(sasm); 845 846 __ verify_oop(obj); 847 __ leave(); 848 __ ret(lr); 849 850 // r0: new array 851 } 852 break; 853 854 case new_multi_array_id: 855 { StubFrame f(sasm, "new_multi_array", dont_gc_arguments); 856 // r0,: klass 857 // r19,: rank 858 // r2: address of 1st dimension 859 OopMap* map = save_live_registers(sasm); 860 __ mov(c_rarg1, r0); 861 __ mov(c_rarg3, r2); 862 __ mov(c_rarg2, r19); 863 int call_offset = __ call_RT(r0, noreg, CAST_FROM_FN_PTR(address, new_multi_array), r1, r2, r3); 864 865 oop_maps = new OopMapSet(); 866 oop_maps->add_gc_map(call_offset, map); 867 restore_live_registers_except_r0(sasm); 868 869 // r0,: new multi array 870 __ verify_oop(r0); 871 } 872 break; 873 874 case register_finalizer_id: 875 { 876 __ set_info("register_finalizer", dont_gc_arguments); 877 878 // This is called via call_runtime so the arguments 879 // will be place in C abi locations 880 881 __ verify_oop(c_rarg0); 882 883 // load the klass and check the has finalizer flag 884 Label register_finalizer; 885 Register t = r5; 886 __ load_klass(t, r0); 887 __ ldrw(t, Address(t, Klass::access_flags_offset())); 888 __ tbnz(t, exact_log2(JVM_ACC_HAS_FINALIZER), register_finalizer); 889 __ ret(lr); 890 891 __ bind(register_finalizer); 892 __ enter(); 893 OopMap* oop_map = save_live_registers(sasm); 894 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, SharedRuntime::register_finalizer), r0); 895 oop_maps = new OopMapSet(); 896 oop_maps->add_gc_map(call_offset, oop_map); 897 898 // Now restore all the live registers 899 restore_live_registers(sasm); 900 901 __ leave(); 902 __ ret(lr); 903 } 904 break; 905 906 case throw_class_cast_exception_id: 907 { StubFrame f(sasm, "throw_class_cast_exception", dont_gc_arguments, does_not_return); 908 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_class_cast_exception), true); 909 } 910 break; 911 912 case throw_incompatible_class_change_error_id: 913 { StubFrame f(sasm, "throw_incompatible_class_cast_exception", dont_gc_arguments, does_not_return); 914 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_incompatible_class_change_error), false); 915 } 916 break; 917 918 case slow_subtype_check_id: 919 { 920 // Typical calling sequence: 921 // __ push(klass_RInfo); // object klass or other subclass 922 // __ push(sup_k_RInfo); // array element klass or other superclass 923 // __ bl(slow_subtype_check); 924 // Note that the subclass is pushed first, and is therefore deepest. 925 enum layout { 926 r0_off, r0_off_hi, 927 r2_off, r2_off_hi, 928 r4_off, r4_off_hi, 929 r5_off, r5_off_hi, 930 sup_k_off, sup_k_off_hi, 931 klass_off, klass_off_hi, 932 framesize, 933 result_off = sup_k_off 934 }; 935 936 __ set_info("slow_subtype_check", dont_gc_arguments); 937 __ push(RegSet::of(r0, r2, r4, r5), sp); 938 939 // This is called by pushing args and not with C abi 940 // __ ldr(r4, Address(sp, (klass_off) * VMRegImpl::stack_slot_size)); // subclass 941 // __ ldr(r0, Address(sp, (sup_k_off) * VMRegImpl::stack_slot_size)); // superclass 942 943 __ ldp(r4, r0, Address(sp, (sup_k_off) * VMRegImpl::stack_slot_size)); 944 945 Label miss; 946 __ check_klass_subtype_slow_path(r4, r0, r2, r5, NULL, &miss); 947 948 // fallthrough on success: 949 __ mov(rscratch1, 1); 950 __ str(rscratch1, Address(sp, (result_off) * VMRegImpl::stack_slot_size)); // result 951 __ pop(RegSet::of(r0, r2, r4, r5), sp); 952 __ ret(lr); 953 954 __ bind(miss); 955 __ str(zr, Address(sp, (result_off) * VMRegImpl::stack_slot_size)); // result 956 __ pop(RegSet::of(r0, r2, r4, r5), sp); 957 __ ret(lr); 958 } 959 break; 960 961 case monitorenter_nofpu_id: 962 save_fpu_registers = false; 963 // fall through 964 case monitorenter_id: 965 { 966 StubFrame f(sasm, "monitorenter", dont_gc_arguments); 967 OopMap* map = save_live_registers(sasm, save_fpu_registers); 968 969 // Called with store_parameter and not C abi 970 971 f.load_argument(1, r0); // r0,: object 972 f.load_argument(0, r1); // r1,: lock address 973 974 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, monitorenter), r0, r1); 975 976 oop_maps = new OopMapSet(); 977 oop_maps->add_gc_map(call_offset, map); 978 restore_live_registers(sasm, save_fpu_registers); 979 } 980 break; 981 982 case monitorexit_nofpu_id: 983 save_fpu_registers = false; 984 // fall through 985 case monitorexit_id: 986 { 987 StubFrame f(sasm, "monitorexit", dont_gc_arguments); 988 OopMap* map = save_live_registers(sasm, save_fpu_registers); 989 990 // Called with store_parameter and not C abi 991 992 f.load_argument(0, r0); // r0,: lock address 993 994 // note: really a leaf routine but must setup last java sp 995 // => use call_RT for now (speed can be improved by 996 // doing last java sp setup manually) 997 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, monitorexit), r0); 998 999 oop_maps = new OopMapSet(); 1000 oop_maps->add_gc_map(call_offset, map); 1001 restore_live_registers(sasm, save_fpu_registers); 1002 } 1003 break; 1004 1005 case deoptimize_id: 1006 { 1007 StubFrame f(sasm, "deoptimize", dont_gc_arguments, does_not_return); 1008 OopMap* oop_map = save_live_registers(sasm); 1009 f.load_argument(0, c_rarg1); 1010 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, deoptimize), c_rarg1); 1011 1012 oop_maps = new OopMapSet(); 1013 oop_maps->add_gc_map(call_offset, oop_map); 1014 restore_live_registers(sasm); 1015 DeoptimizationBlob* deopt_blob = SharedRuntime::deopt_blob(); 1016 assert(deopt_blob != NULL, "deoptimization blob must have been created"); 1017 __ leave(); 1018 __ far_jump(RuntimeAddress(deopt_blob->unpack_with_reexecution())); 1019 } 1020 break; 1021 1022 case throw_range_check_failed_id: 1023 { StubFrame f(sasm, "range_check_failed", dont_gc_arguments, does_not_return); 1024 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_range_check_exception), true); 1025 } 1026 break; 1027 1028 case unwind_exception_id: 1029 { __ set_info("unwind_exception", dont_gc_arguments); 1030 // note: no stubframe since we are about to leave the current 1031 // activation and we are calling a leaf VM function only. 1032 generate_unwind_exception(sasm); 1033 } 1034 break; 1035 1036 case access_field_patching_id: 1037 { StubFrame f(sasm, "access_field_patching", dont_gc_arguments, does_not_return); 1038 // we should set up register map 1039 oop_maps = generate_patching(sasm, CAST_FROM_FN_PTR(address, access_field_patching)); 1040 } 1041 break; 1042 1043 case load_klass_patching_id: 1044 { StubFrame f(sasm, "load_klass_patching", dont_gc_arguments, does_not_return); 1045 // we should set up register map 1046 oop_maps = generate_patching(sasm, CAST_FROM_FN_PTR(address, move_klass_patching)); 1047 } 1048 break; 1049 1050 case load_mirror_patching_id: 1051 { StubFrame f(sasm, "load_mirror_patching", dont_gc_arguments, does_not_return); 1052 // we should set up register map 1053 oop_maps = generate_patching(sasm, CAST_FROM_FN_PTR(address, move_mirror_patching)); 1054 } 1055 break; 1056 1057 case load_appendix_patching_id: 1058 { StubFrame f(sasm, "load_appendix_patching", dont_gc_arguments, does_not_return); 1059 // we should set up register map 1060 oop_maps = generate_patching(sasm, CAST_FROM_FN_PTR(address, move_appendix_patching)); 1061 } 1062 break; 1063 1064 case handle_exception_nofpu_id: 1065 case handle_exception_id: 1066 { StubFrame f(sasm, "handle_exception", dont_gc_arguments); 1067 oop_maps = generate_handle_exception(id, sasm); 1068 } 1069 break; 1070 1071 case handle_exception_from_callee_id: 1072 { StubFrame f(sasm, "handle_exception_from_callee", dont_gc_arguments); 1073 oop_maps = generate_handle_exception(id, sasm); 1074 } 1075 break; 1076 1077 case throw_index_exception_id: 1078 { StubFrame f(sasm, "index_range_check_failed", dont_gc_arguments, does_not_return); 1079 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_index_exception), true); 1080 } 1081 break; 1082 1083 case throw_array_store_exception_id: 1084 { StubFrame f(sasm, "throw_array_store_exception", dont_gc_arguments, does_not_return); 1085 // tos + 0: link 1086 // + 1: return address 1087 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_array_store_exception), true); 1088 } 1089 break; 1090 1091 case predicate_failed_trap_id: 1092 { 1093 StubFrame f(sasm, "predicate_failed_trap", dont_gc_arguments, does_not_return); 1094 1095 OopMap* map = save_live_registers(sasm); 1096 1097 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, predicate_failed_trap)); 1098 oop_maps = new OopMapSet(); 1099 oop_maps->add_gc_map(call_offset, map); 1100 restore_live_registers(sasm); 1101 __ leave(); 1102 DeoptimizationBlob* deopt_blob = SharedRuntime::deopt_blob(); 1103 assert(deopt_blob != NULL, "deoptimization blob must have been created"); 1104 1105 __ far_jump(RuntimeAddress(deopt_blob->unpack_with_reexecution())); 1106 } 1107 break; 1108 1109 case dtrace_object_alloc_id: 1110 { // c_rarg0: object 1111 StubFrame f(sasm, "dtrace_object_alloc", dont_gc_arguments); 1112 save_live_registers(sasm); 1113 1114 __ call_VM_leaf(CAST_FROM_FN_PTR(address, static_cast<int (*)(oopDesc*)>(SharedRuntime::dtrace_object_alloc)), c_rarg0); 1115 1116 restore_live_registers(sasm); 1117 } 1118 break; 1119 1120 default: 1121 { StubFrame f(sasm, "unimplemented entry", dont_gc_arguments, does_not_return); 1122 __ mov(r0, (int)id); 1123 __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, unimplemented_entry), r0); 1124 } 1125 break; 1126 } 1127 } 1128 return oop_maps; 1129 } 1130 1131 #undef __ 1132 1133 const char *Runtime1::pd_name_for_address(address entry) { Unimplemented(); return 0; }