1 /* 2 * Copyright (c) 1999, 2018, Oracle and/or its affiliates. All rights reserved. 3 * Copyright (c) 2014, 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 "gc/shared/cardTable.hpp" 34 #include "gc/shared/cardTableBarrierSet.hpp" 35 #include "interpreter/interpreter.hpp" 36 #include "memory/universe.hpp" 37 #include "nativeInst_aarch64.hpp" 38 #include "oops/compiledICHolder.hpp" 39 #include "oops/oop.inline.hpp" 40 #include "prims/jvmtiExport.hpp" 41 #include "register_aarch64.hpp" 42 #include "runtime/sharedRuntime.hpp" 43 #include "runtime/signature.hpp" 44 #include "runtime/vframe.hpp" 45 #include "runtime/vframeArray.hpp" 46 #include "vmreg_aarch64.inline.hpp" 47 48 49 // Implementation of StubAssembler 50 51 int StubAssembler::call_RT(Register oop_result1, Register metadata_result, address entry, int args_size) { 52 // setup registers 53 assert(!(oop_result1->is_valid() || metadata_result->is_valid()) || oop_result1 != metadata_result, "registers must be different"); 54 assert(oop_result1 != rthread && metadata_result != rthread, "registers must be different"); 55 assert(args_size >= 0, "illegal args_size"); 56 bool align_stack = false; 57 58 mov(c_rarg0, rthread); 59 set_num_rt_args(0); // Nothing on stack 60 61 Label retaddr; 62 set_last_Java_frame(sp, rfp, retaddr, rscratch1); 63 64 // do the call 65 lea(rscratch1, RuntimeAddress(entry)); 66 blrt(rscratch1, args_size + 1, 8, 1); 67 bind(retaddr); 68 int call_offset = offset(); 69 // verify callee-saved register 70 #ifdef ASSERT 71 push(r0, sp); 72 { Label L; 73 get_thread(r0); 74 cmp(rthread, r0); 75 br(Assembler::EQ, L); 76 stop("StubAssembler::call_RT: rthread not callee saved?"); 77 bind(L); 78 } 79 pop(r0, sp); 80 #endif 81 reset_last_Java_frame(true); 82 maybe_isb(); 83 84 // check for pending exceptions 85 { Label L; 86 // check for pending exceptions (java_thread is set upon return) 87 ldr(rscratch1, Address(rthread, in_bytes(Thread::pending_exception_offset()))); 88 cbz(rscratch1, L); 89 // exception pending => remove activation and forward to exception handler 90 // make sure that the vm_results are cleared 91 if (oop_result1->is_valid()) { 92 str(zr, Address(rthread, JavaThread::vm_result_offset())); 93 } 94 if (metadata_result->is_valid()) { 95 str(zr, Address(rthread, JavaThread::vm_result_2_offset())); 96 } 97 if (frame_size() == no_frame_size) { 98 leave(); 99 far_jump(RuntimeAddress(StubRoutines::forward_exception_entry())); 100 } else if (_stub_id == Runtime1::forward_exception_id) { 101 should_not_reach_here(); 102 } else { 103 far_jump(RuntimeAddress(Runtime1::entry_for(Runtime1::forward_exception_id))); 104 } 105 bind(L); 106 } 107 // get oop results if there are any and reset the values in the thread 108 if (oop_result1->is_valid()) { 109 get_vm_result(oop_result1, rthread); 110 } 111 if (metadata_result->is_valid()) { 112 get_vm_result_2(metadata_result, rthread); 113 } 114 return call_offset; 115 } 116 117 118 int StubAssembler::call_RT(Register oop_result1, Register metadata_result, address entry, Register arg1) { 119 mov(c_rarg1, arg1); 120 return call_RT(oop_result1, metadata_result, entry, 1); 121 } 122 123 124 int StubAssembler::call_RT(Register oop_result1, Register metadata_result, address entry, Register arg1, Register arg2) { 125 if (c_rarg1 == arg2) { 126 if (c_rarg2 == arg1) { 127 mov(rscratch1, arg1); 128 mov(arg1, arg2); 129 mov(arg2, rscratch1); 130 } else { 131 mov(c_rarg2, arg2); 132 mov(c_rarg1, arg1); 133 } 134 } else { 135 mov(c_rarg1, arg1); 136 mov(c_rarg2, arg2); 137 } 138 return call_RT(oop_result1, metadata_result, entry, 2); 139 } 140 141 142 int StubAssembler::call_RT(Register oop_result1, Register metadata_result, address entry, Register arg1, Register arg2, Register arg3) { 143 // if there is any conflict use the stack 144 if (arg1 == c_rarg2 || arg1 == c_rarg3 || 145 arg2 == c_rarg1 || arg1 == c_rarg3 || 146 arg3 == c_rarg1 || arg1 == c_rarg2) { 147 stp(arg3, arg2, Address(pre(sp, 2 * wordSize))); 148 stp(arg1, zr, Address(pre(sp, -2 * wordSize))); 149 ldp(c_rarg1, zr, Address(post(sp, 2 * wordSize))); 150 ldp(c_rarg3, c_rarg2, Address(post(sp, 2 * wordSize))); 151 } else { 152 mov(c_rarg1, arg1); 153 mov(c_rarg2, arg2); 154 mov(c_rarg3, arg3); 155 } 156 return call_RT(oop_result1, metadata_result, entry, 3); 157 } 158 159 // Implementation of StubFrame 160 161 class StubFrame: public StackObj { 162 private: 163 StubAssembler* _sasm; 164 165 public: 166 StubFrame(StubAssembler* sasm, const char* name, bool must_gc_arguments); 167 void load_argument(int offset_in_words, Register reg); 168 169 ~StubFrame(); 170 };; 171 172 void StubAssembler::prologue(const char* name, bool must_gc_arguments) { 173 set_info(name, must_gc_arguments); 174 enter(); 175 } 176 177 void StubAssembler::epilogue() { 178 leave(); 179 ret(lr); 180 } 181 182 #define __ _sasm-> 183 184 StubFrame::StubFrame(StubAssembler* sasm, const char* name, bool must_gc_arguments) { 185 _sasm = sasm; 186 __ prologue(name, must_gc_arguments); 187 } 188 189 // load parameters that were stored with LIR_Assembler::store_parameter 190 // Note: offsets for store_parameter and load_argument must match 191 void StubFrame::load_argument(int offset_in_words, Register reg) { 192 __ load_parameter(offset_in_words, reg); 193 } 194 195 196 StubFrame::~StubFrame() { 197 __ epilogue(); 198 } 199 200 #undef __ 201 202 203 // Implementation of Runtime1 204 205 #define __ sasm-> 206 207 const int float_regs_as_doubles_size_in_slots = pd_nof_fpu_regs_frame_map * 2; 208 209 // Stack layout for saving/restoring all the registers needed during a runtime 210 // call (this includes deoptimization) 211 // Note: note that users of this frame may well have arguments to some runtime 212 // while these values are on the stack. These positions neglect those arguments 213 // but the code in save_live_registers will take the argument count into 214 // account. 215 // 216 217 enum reg_save_layout { 218 reg_save_frame_size = 32 /* float */ + 32 /* integer */ 219 }; 220 221 // Save off registers which might be killed by calls into the runtime. 222 // Tries to smart of about FP registers. In particular we separate 223 // saving and describing the FPU registers for deoptimization since we 224 // have to save the FPU registers twice if we describe them. The 225 // deopt blob is the only thing which needs to describe FPU registers. 226 // In all other cases it should be sufficient to simply save their 227 // current value. 228 229 static int cpu_reg_save_offsets[FrameMap::nof_cpu_regs]; 230 static int fpu_reg_save_offsets[FrameMap::nof_fpu_regs]; 231 static int reg_save_size_in_words; 232 static int frame_size_in_bytes = -1; 233 234 static OopMap* generate_oop_map(StubAssembler* sasm, bool save_fpu_registers) { 235 int frame_size_in_bytes = reg_save_frame_size * BytesPerWord; 236 sasm->set_frame_size(frame_size_in_bytes / BytesPerWord); 237 int frame_size_in_slots = frame_size_in_bytes / sizeof(jint); 238 OopMap* oop_map = new OopMap(frame_size_in_slots, 0); 239 240 for (int i = 0; i < FrameMap::nof_cpu_regs; i++) { 241 Register r = as_Register(i); 242 if (i <= 18 && i != rscratch1->encoding() && i != rscratch2->encoding()) { 243 int sp_offset = cpu_reg_save_offsets[i]; 244 oop_map->set_callee_saved(VMRegImpl::stack2reg(sp_offset), 245 r->as_VMReg()); 246 } 247 } 248 249 if (save_fpu_registers) { 250 for (int i = 0; i < FrameMap::nof_fpu_regs; i++) { 251 FloatRegister r = as_FloatRegister(i); 252 { 253 int sp_offset = fpu_reg_save_offsets[i]; 254 oop_map->set_callee_saved(VMRegImpl::stack2reg(sp_offset), 255 r->as_VMReg()); 256 } 257 } 258 } 259 return oop_map; 260 } 261 262 static OopMap* save_live_registers(StubAssembler* sasm, 263 bool save_fpu_registers = true) { 264 __ block_comment("save_live_registers"); 265 266 __ push(RegSet::range(r0, r29), sp); // integer registers except lr & sp 267 268 if (save_fpu_registers) { 269 for (int i = 31; i>= 0; i -= 4) { 270 __ sub(sp, sp, 4 * wordSize); // no pre-increment for st1. Emulate it without modifying other registers 271 __ st1(as_FloatRegister(i-3), as_FloatRegister(i-2), as_FloatRegister(i-1), 272 as_FloatRegister(i), __ T1D, Address(sp)); 273 } 274 } else { 275 __ add(sp, sp, -32 * wordSize); 276 } 277 278 return generate_oop_map(sasm, save_fpu_registers); 279 } 280 281 static void restore_live_registers(StubAssembler* sasm, bool restore_fpu_registers = true) { 282 if (restore_fpu_registers) { 283 for (int i = 0; i < 32; i += 4) 284 __ ld1(as_FloatRegister(i), as_FloatRegister(i+1), as_FloatRegister(i+2), 285 as_FloatRegister(i+3), __ T1D, Address(__ post(sp, 4 * wordSize))); 286 } else { 287 __ add(sp, sp, 32 * wordSize); 288 } 289 290 __ pop(RegSet::range(r0, r29), sp); 291 } 292 293 static void restore_live_registers_except_r0(StubAssembler* sasm, bool restore_fpu_registers = true) { 294 295 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 __ ldp(zr, r1, Address(__ post(sp, 16))); 304 __ pop(RegSet::range(r2, r29), sp); 305 } 306 307 308 309 void Runtime1::initialize_pd() { 310 int i; 311 int sp_offset = 0; 312 313 // all float registers are saved explicitly 314 assert(FrameMap::nof_fpu_regs == 32, "double registers not handled here"); 315 for (i = 0; i < FrameMap::nof_fpu_regs; i++) { 316 fpu_reg_save_offsets[i] = sp_offset; 317 sp_offset += 2; // SP offsets are in halfwords 318 } 319 320 for (i = 0; i < FrameMap::nof_cpu_regs; i++) { 321 Register r = as_Register(i); 322 cpu_reg_save_offsets[i] = sp_offset; 323 sp_offset += 2; // SP offsets are in halfwords 324 } 325 } 326 327 328 // target: the entry point of the method that creates and posts the exception oop 329 // has_argument: true if the exception needs arguments (passed in rscratch1 and rscratch2) 330 331 OopMapSet* Runtime1::generate_exception_throw(StubAssembler* sasm, address target, bool has_argument) { 332 // make a frame and preserve the caller's caller-save registers 333 OopMap* oop_map = save_live_registers(sasm); 334 int call_offset; 335 if (!has_argument) { 336 call_offset = __ call_RT(noreg, noreg, target); 337 } else { 338 __ mov(c_rarg1, rscratch1); 339 __ mov(c_rarg2, rscratch2); 340 call_offset = __ call_RT(noreg, noreg, target); 341 } 342 OopMapSet* oop_maps = new OopMapSet(); 343 oop_maps->add_gc_map(call_offset, oop_map); 344 345 __ should_not_reach_here(); 346 return oop_maps; 347 } 348 349 350 OopMapSet* Runtime1::generate_handle_exception(StubID id, StubAssembler *sasm) { 351 __ block_comment("generate_handle_exception"); 352 353 // incoming parameters 354 const Register exception_oop = r0; 355 const Register exception_pc = r3; 356 // other registers used in this stub 357 358 // Save registers, if required. 359 OopMapSet* oop_maps = new OopMapSet(); 360 OopMap* oop_map = NULL; 361 switch (id) { 362 case forward_exception_id: 363 // We're handling an exception in the context of a compiled frame. 364 // The registers have been saved in the standard places. Perform 365 // an exception lookup in the caller and dispatch to the handler 366 // if found. Otherwise unwind and dispatch to the callers 367 // exception handler. 368 oop_map = generate_oop_map(sasm, 1 /*thread*/); 369 370 // load and clear pending exception oop into r0 371 __ ldr(exception_oop, Address(rthread, Thread::pending_exception_offset())); 372 __ str(zr, Address(rthread, Thread::pending_exception_offset())); 373 374 // load issuing PC (the return address for this stub) into r3 375 __ ldr(exception_pc, Address(rfp, 1*BytesPerWord)); 376 377 // make sure that the vm_results are cleared (may be unnecessary) 378 __ str(zr, Address(rthread, JavaThread::vm_result_offset())); 379 __ str(zr, Address(rthread, JavaThread::vm_result_2_offset())); 380 break; 381 case handle_exception_nofpu_id: 382 case handle_exception_id: 383 // At this point all registers MAY be live. 384 oop_map = save_live_registers(sasm, id != handle_exception_nofpu_id); 385 break; 386 case handle_exception_from_callee_id: { 387 // At this point all registers except exception oop (r0) and 388 // exception pc (lr) are dead. 389 const int frame_size = 2 /*fp, return address*/; 390 oop_map = new OopMap(frame_size * VMRegImpl::slots_per_word, 0); 391 sasm->set_frame_size(frame_size); 392 break; 393 } 394 default: 395 __ should_not_reach_here(); 396 break; 397 } 398 399 // verify that only r0 and r3 are valid at this time 400 __ invalidate_registers(false, true, true, false, true, true); 401 // verify that r0 contains a valid exception 402 __ verify_not_null_oop(exception_oop); 403 404 #ifdef ASSERT 405 // check that fields in JavaThread for exception oop and issuing pc are 406 // empty before writing to them 407 Label oop_empty; 408 __ ldr(rscratch1, Address(rthread, JavaThread::exception_oop_offset())); 409 __ cbz(rscratch1, oop_empty); 410 __ stop("exception oop already set"); 411 __ bind(oop_empty); 412 413 Label pc_empty; 414 __ ldr(rscratch1, Address(rthread, JavaThread::exception_pc_offset())); 415 __ cbz(rscratch1, pc_empty); 416 __ stop("exception pc already set"); 417 __ bind(pc_empty); 418 #endif 419 420 // save exception oop and issuing pc into JavaThread 421 // (exception handler will load it from here) 422 __ str(exception_oop, Address(rthread, JavaThread::exception_oop_offset())); 423 __ str(exception_pc, Address(rthread, JavaThread::exception_pc_offset())); 424 425 // patch throwing pc into return address (has bci & oop map) 426 __ str(exception_pc, Address(rfp, 1*BytesPerWord)); 427 428 // compute the exception handler. 429 // the exception oop and the throwing pc are read from the fields in JavaThread 430 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, exception_handler_for_pc)); 431 oop_maps->add_gc_map(call_offset, oop_map); 432 433 // r0: handler address 434 // will be the deopt blob if nmethod was deoptimized while we looked up 435 // handler regardless of whether handler existed in the nmethod. 436 437 // only r0 is valid at this time, all other registers have been destroyed by the runtime call 438 __ invalidate_registers(false, true, true, true, true, true); 439 440 // patch the return address, this stub will directly return to the exception handler 441 __ str(r0, Address(rfp, 1*BytesPerWord)); 442 443 switch (id) { 444 case forward_exception_id: 445 case handle_exception_nofpu_id: 446 case handle_exception_id: 447 // Restore the registers that were saved at the beginning. 448 restore_live_registers(sasm, id != handle_exception_nofpu_id); 449 break; 450 case handle_exception_from_callee_id: 451 // Pop the return address. 452 __ leave(); 453 __ ret(lr); // jump to exception handler 454 break; 455 default: ShouldNotReachHere(); 456 } 457 458 return oop_maps; 459 } 460 461 462 void Runtime1::generate_unwind_exception(StubAssembler *sasm) { 463 // incoming parameters 464 const Register exception_oop = r0; 465 // callee-saved copy of exception_oop during runtime call 466 const Register exception_oop_callee_saved = r19; 467 // other registers used in this stub 468 const Register exception_pc = r3; 469 const Register handler_addr = r1; 470 471 // verify that only r0, is valid at this time 472 __ invalidate_registers(false, true, true, true, true, true); 473 474 #ifdef ASSERT 475 // check that fields in JavaThread for exception oop and issuing pc are empty 476 Label oop_empty; 477 __ ldr(rscratch1, Address(rthread, JavaThread::exception_oop_offset())); 478 __ cbz(rscratch1, oop_empty); 479 __ stop("exception oop must be empty"); 480 __ bind(oop_empty); 481 482 Label pc_empty; 483 __ ldr(rscratch1, Address(rthread, JavaThread::exception_pc_offset())); 484 __ cbz(rscratch1, pc_empty); 485 __ stop("exception pc must be empty"); 486 __ bind(pc_empty); 487 #endif 488 489 // Save our return address because 490 // exception_handler_for_return_address will destroy it. We also 491 // save exception_oop 492 __ stp(lr, exception_oop, Address(__ pre(sp, -2 * wordSize))); 493 494 // search the exception handler address of the caller (using the return address) 495 __ call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::exception_handler_for_return_address), rthread, lr); 496 // r0: exception handler address of the caller 497 498 // Only R0 is valid at this time; all other registers have been 499 // destroyed by the call. 500 __ invalidate_registers(false, true, true, true, false, true); 501 502 // move result of call into correct register 503 __ mov(handler_addr, r0); 504 505 // get throwing pc (= return address). 506 // lr has been destroyed by the call 507 __ ldp(lr, exception_oop, Address(__ post(sp, 2 * wordSize))); 508 __ mov(r3, lr); 509 510 __ verify_not_null_oop(exception_oop); 511 512 // continue at exception handler (return address removed) 513 // note: do *not* remove arguments when unwinding the 514 // activation since the caller assumes having 515 // all arguments on the stack when entering the 516 // runtime to determine the exception handler 517 // (GC happens at call site with arguments!) 518 // r0: exception oop 519 // r3: throwing pc 520 // r1: exception handler 521 __ br(handler_addr); 522 } 523 524 525 526 OopMapSet* Runtime1::generate_patching(StubAssembler* sasm, address target) { 527 // use the maximum number of runtime-arguments here because it is difficult to 528 // distinguish each RT-Call. 529 // Note: This number affects also the RT-Call in generate_handle_exception because 530 // the oop-map is shared for all calls. 531 DeoptimizationBlob* deopt_blob = SharedRuntime::deopt_blob(); 532 assert(deopt_blob != NULL, "deoptimization blob must have been created"); 533 534 OopMap* oop_map = save_live_registers(sasm); 535 536 __ mov(c_rarg0, rthread); 537 Label retaddr; 538 __ set_last_Java_frame(sp, rfp, retaddr, rscratch1); 539 // do the call 540 __ lea(rscratch1, RuntimeAddress(target)); 541 __ blrt(rscratch1, 1, 0, 1); 542 __ bind(retaddr); 543 OopMapSet* oop_maps = new OopMapSet(); 544 oop_maps->add_gc_map(__ offset(), oop_map); 545 // verify callee-saved register 546 #ifdef ASSERT 547 { Label L; 548 __ get_thread(rscratch1); 549 __ cmp(rthread, rscratch1); 550 __ br(Assembler::EQ, L); 551 __ stop("StubAssembler::call_RT: rthread not callee saved?"); 552 __ bind(L); 553 } 554 #endif 555 __ reset_last_Java_frame(true); 556 __ maybe_isb(); 557 558 // check for pending exceptions 559 { Label L; 560 __ ldr(rscratch1, Address(rthread, Thread::pending_exception_offset())); 561 __ cbz(rscratch1, L); 562 // exception pending => remove activation and forward to exception handler 563 564 { Label L1; 565 __ cbnz(r0, L1); // have we deoptimized? 566 __ far_jump(RuntimeAddress(Runtime1::entry_for(Runtime1::forward_exception_id))); 567 __ bind(L1); 568 } 569 570 // the deopt blob expects exceptions in the special fields of 571 // JavaThread, so copy and clear pending exception. 572 573 // load and clear pending exception 574 __ ldr(r0, Address(rthread, Thread::pending_exception_offset())); 575 __ str(zr, Address(rthread, Thread::pending_exception_offset())); 576 577 // check that there is really a valid exception 578 __ verify_not_null_oop(r0); 579 580 // load throwing pc: this is the return address of the stub 581 __ mov(r3, lr); 582 583 #ifdef ASSERT 584 // check that fields in JavaThread for exception oop and issuing pc are empty 585 Label oop_empty; 586 __ ldr(rscratch1, Address(rthread, Thread::pending_exception_offset())); 587 __ cbz(rscratch1, oop_empty); 588 __ stop("exception oop must be empty"); 589 __ bind(oop_empty); 590 591 Label pc_empty; 592 __ ldr(rscratch1, Address(rthread, JavaThread::exception_pc_offset())); 593 __ cbz(rscratch1, pc_empty); 594 __ stop("exception pc must be empty"); 595 __ bind(pc_empty); 596 #endif 597 598 // store exception oop and throwing pc to JavaThread 599 __ str(r0, Address(rthread, JavaThread::exception_oop_offset())); 600 __ str(r3, Address(rthread, JavaThread::exception_pc_offset())); 601 602 restore_live_registers(sasm); 603 604 __ leave(); 605 606 // Forward the exception directly to deopt blob. We can blow no 607 // registers and must leave throwing pc on the stack. A patch may 608 // have values live in registers so the entry point with the 609 // exception in tls. 610 __ far_jump(RuntimeAddress(deopt_blob->unpack_with_exception_in_tls())); 611 612 __ bind(L); 613 } 614 615 616 // Runtime will return true if the nmethod has been deoptimized during 617 // the patching process. In that case we must do a deopt reexecute instead. 618 619 Label cont; 620 621 __ cbz(r0, cont); // have we deoptimized? 622 623 // Will reexecute. Proper return address is already on the stack we just restore 624 // registers, pop all of our frame but the return address and jump to the deopt blob 625 restore_live_registers(sasm); 626 __ leave(); 627 __ far_jump(RuntimeAddress(deopt_blob->unpack_with_reexecution())); 628 629 __ bind(cont); 630 restore_live_registers(sasm); 631 __ leave(); 632 __ ret(lr); 633 634 return oop_maps; 635 } 636 637 638 OopMapSet* Runtime1::generate_code_for(StubID id, StubAssembler* sasm) { 639 640 const Register exception_oop = r0; 641 const Register exception_pc = r3; 642 643 // for better readability 644 const bool must_gc_arguments = true; 645 const bool dont_gc_arguments = false; 646 647 // default value; overwritten for some optimized stubs that are called from methods that do not use the fpu 648 bool save_fpu_registers = true; 649 650 // stub code & info for the different stubs 651 OopMapSet* oop_maps = NULL; 652 OopMap* oop_map = NULL; 653 switch (id) { 654 { 655 case forward_exception_id: 656 { 657 oop_maps = generate_handle_exception(id, sasm); 658 __ leave(); 659 __ ret(lr); 660 } 661 break; 662 663 case throw_div0_exception_id: 664 { StubFrame f(sasm, "throw_div0_exception", dont_gc_arguments); 665 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_div0_exception), false); 666 } 667 break; 668 669 case throw_null_pointer_exception_id: 670 { StubFrame f(sasm, "throw_null_pointer_exception", dont_gc_arguments); 671 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_null_pointer_exception), false); 672 } 673 break; 674 675 case new_instance_id: 676 case fast_new_instance_id: 677 case fast_new_instance_init_check_id: 678 { 679 Register klass = r3; // Incoming 680 Register obj = r0; // Result 681 682 if (id == new_instance_id) { 683 __ set_info("new_instance", dont_gc_arguments); 684 } else if (id == fast_new_instance_id) { 685 __ set_info("fast new_instance", dont_gc_arguments); 686 } else { 687 assert(id == fast_new_instance_init_check_id, "bad StubID"); 688 __ set_info("fast new_instance init check", dont_gc_arguments); 689 } 690 691 // If TLAB is disabled, see if there is support for inlining contiguous 692 // allocations. 693 // Otherwise, just go to the slow path. 694 if ((id == fast_new_instance_id || id == fast_new_instance_init_check_id) && 695 !UseTLAB && Universe::heap()->supports_inline_contig_alloc()) { 696 Label slow_path; 697 Register obj_size = r2; 698 Register t1 = r19; 699 Register t2 = r4; 700 assert_different_registers(klass, obj, obj_size, t1, t2); 701 702 __ stp(r19, zr, Address(__ pre(sp, -2 * wordSize))); 703 704 if (id == fast_new_instance_init_check_id) { 705 // make sure the klass is initialized 706 __ ldrb(rscratch1, Address(klass, InstanceKlass::init_state_offset())); 707 __ cmpw(rscratch1, InstanceKlass::fully_initialized); 708 __ br(Assembler::NE, slow_path); 709 } 710 711 #ifdef ASSERT 712 // assert object can be fast path allocated 713 { 714 Label ok, not_ok; 715 __ ldrw(obj_size, Address(klass, Klass::layout_helper_offset())); 716 __ cmp(obj_size, (u1)0); 717 __ br(Assembler::LE, not_ok); // make sure it's an instance (LH > 0) 718 __ tstw(obj_size, Klass::_lh_instance_slow_path_bit); 719 __ br(Assembler::EQ, ok); 720 __ bind(not_ok); 721 __ stop("assert(can be fast path allocated)"); 722 __ should_not_reach_here(); 723 __ bind(ok); 724 } 725 #endif // ASSERT 726 727 // get the instance size (size is postive so movl is fine for 64bit) 728 __ ldrw(obj_size, Address(klass, Klass::layout_helper_offset())); 729 730 __ eden_allocate(obj, obj_size, 0, t1, slow_path); 731 732 __ initialize_object(obj, klass, obj_size, 0, t1, t2, /* is_tlab_allocated */ false); 733 __ verify_oop(obj); 734 __ ldp(r19, zr, Address(__ post(sp, 2 * wordSize))); 735 __ ret(lr); 736 737 __ bind(slow_path); 738 __ ldp(r19, zr, Address(__ post(sp, 2 * wordSize))); 739 } 740 741 __ enter(); 742 OopMap* map = save_live_registers(sasm); 743 int call_offset = __ call_RT(obj, noreg, CAST_FROM_FN_PTR(address, new_instance), klass); 744 oop_maps = new OopMapSet(); 745 oop_maps->add_gc_map(call_offset, map); 746 restore_live_registers_except_r0(sasm); 747 __ verify_oop(obj); 748 __ leave(); 749 __ ret(lr); 750 751 // r0,: new instance 752 } 753 754 break; 755 756 case counter_overflow_id: 757 { 758 Register bci = r0, method = r1; 759 __ enter(); 760 OopMap* map = save_live_registers(sasm); 761 // Retrieve bci 762 __ ldrw(bci, Address(rfp, 2*BytesPerWord)); 763 // And a pointer to the Method* 764 __ ldr(method, Address(rfp, 3*BytesPerWord)); 765 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, counter_overflow), bci, method); 766 oop_maps = new OopMapSet(); 767 oop_maps->add_gc_map(call_offset, map); 768 restore_live_registers(sasm); 769 __ leave(); 770 __ ret(lr); 771 } 772 break; 773 774 case new_type_array_id: 775 case new_object_array_id: 776 case new_value_array_id: 777 { 778 Register length = r19; // Incoming 779 Register klass = r3; // Incoming 780 Register obj = r0; // Result 781 782 if (id == new_type_array_id) { 783 __ set_info("new_type_array", dont_gc_arguments); 784 } 785 else if (id == new_object_array_id) { 786 __ set_info("new_object_array", dont_gc_arguments); 787 } 788 else { 789 __ set_info("new_value_array", dont_gc_arguments); 790 } 791 792 #ifdef ASSERT 793 // assert object type is really an array of the proper kind 794 { 795 Label ok; 796 Register t0 = obj; 797 __ ldrw(t0, Address(klass, Klass::layout_helper_offset())); 798 __ asrw(t0, t0, Klass::_lh_array_tag_shift); 799 800 int tag = 0; 801 switch (id) { 802 case new_type_array_id: tag = Klass::_lh_array_tag_type_value; break; 803 case new_object_array_id: tag = Klass::_lh_array_tag_obj_value; break; 804 case new_value_array_id: tag = Klass::_lh_array_tag_vt_value; break; 805 default: ShouldNotReachHere(); 806 } 807 __ mov(rscratch1, tag); 808 __ cmpw(t0, rscratch1); 809 __ br(Assembler::EQ, ok); 810 __ stop("assert(is an array klass)"); 811 __ should_not_reach_here(); 812 __ bind(ok); 813 } 814 #endif // ASSERT 815 816 // If TLAB is disabled, see if there is support for inlining contiguous 817 // allocations. 818 // Otherwise, just go to the slow path. 819 if (!UseTLAB && Universe::heap()->supports_inline_contig_alloc()) { 820 Register arr_size = r4; 821 Register t1 = r2; 822 Register t2 = r5; 823 Label slow_path; 824 assert_different_registers(length, klass, obj, arr_size, t1, t2); 825 826 // check that array length is small enough for fast path. 827 __ mov(rscratch1, C1_MacroAssembler::max_array_allocation_length); 828 __ cmpw(length, rscratch1); 829 __ br(Assembler::HI, slow_path); 830 831 // get the allocation size: round_up(hdr + length << (layout_helper & 0x1F)) 832 // since size is positive ldrw does right thing on 64bit 833 __ ldrw(t1, Address(klass, Klass::layout_helper_offset())); 834 // since size is positive movw does right thing on 64bit 835 __ movw(arr_size, length); 836 __ lslvw(arr_size, length, t1); 837 __ ubfx(t1, t1, Klass::_lh_header_size_shift, 838 exact_log2(Klass::_lh_header_size_mask + 1)); 839 __ add(arr_size, arr_size, t1); 840 __ add(arr_size, arr_size, MinObjAlignmentInBytesMask); // align up 841 __ andr(arr_size, arr_size, ~MinObjAlignmentInBytesMask); 842 843 __ eden_allocate(obj, arr_size, 0, t1, slow_path); // preserves arr_size 844 845 __ initialize_header(obj, klass, length, t1, t2); 846 __ ldrb(t1, Address(klass, in_bytes(Klass::layout_helper_offset()) + (Klass::_lh_header_size_shift / BitsPerByte))); 847 assert(Klass::_lh_header_size_shift % BitsPerByte == 0, "bytewise"); 848 assert(Klass::_lh_header_size_mask <= 0xFF, "bytewise"); 849 __ andr(t1, t1, Klass::_lh_header_size_mask); 850 __ sub(arr_size, arr_size, t1); // body length 851 __ add(t1, t1, obj); // body start 852 __ initialize_body(t1, arr_size, 0, t2); 853 __ verify_oop(obj); 854 855 __ ret(lr); 856 857 __ bind(slow_path); 858 } 859 860 __ enter(); 861 OopMap* map = save_live_registers(sasm); 862 int call_offset; 863 if (id == new_type_array_id) { 864 call_offset = __ call_RT(obj, noreg, CAST_FROM_FN_PTR(address, new_type_array), klass, length); 865 } else { 866 // Runtime1::new_object_array handles both object and value arrays 867 call_offset = __ call_RT(obj, noreg, CAST_FROM_FN_PTR(address, new_object_array), klass, length); 868 } 869 870 oop_maps = new OopMapSet(); 871 oop_maps->add_gc_map(call_offset, map); 872 restore_live_registers_except_r0(sasm); 873 874 __ verify_oop(obj); 875 __ leave(); 876 __ ret(lr); 877 878 // r0: new array 879 } 880 break; 881 882 case new_multi_array_id: 883 { StubFrame f(sasm, "new_multi_array", dont_gc_arguments); 884 // r0,: klass 885 // r19,: rank 886 // r2: address of 1st dimension 887 OopMap* map = save_live_registers(sasm); 888 __ mov(c_rarg1, r0); 889 __ mov(c_rarg3, r2); 890 __ mov(c_rarg2, r19); 891 int call_offset = __ call_RT(r0, noreg, CAST_FROM_FN_PTR(address, new_multi_array), r1, r2, r3); 892 893 oop_maps = new OopMapSet(); 894 oop_maps->add_gc_map(call_offset, map); 895 restore_live_registers_except_r0(sasm); 896 897 // r0,: new multi array 898 __ verify_oop(r0); 899 } 900 break; 901 902 case buffer_value_args_id: 903 case buffer_value_args_no_receiver_id: 904 { 905 const char* name = (id == buffer_value_args_id) ? 906 "buffer_value_args" : "buffer_value_args_no_receiver"; 907 StubFrame f(sasm, name, dont_gc_arguments); 908 OopMap* map = save_live_registers(sasm, 2); 909 Register method = r1; 910 address entry = (id == buffer_value_args_id) ? 911 CAST_FROM_FN_PTR(address, buffer_value_args) : 912 CAST_FROM_FN_PTR(address, buffer_value_args_no_receiver); 913 int call_offset = __ call_RT(r0, noreg, entry, method); 914 oop_maps = new OopMapSet(); 915 oop_maps->add_gc_map(call_offset, map); 916 restore_live_registers_except_r0(sasm); 917 __ verify_oop(r0); // r0: an array of buffered value objects 918 } 919 break; 920 921 case load_flattened_array_id: 922 { 923 StubFrame f(sasm, "load_flattened_array", dont_gc_arguments); 924 OopMap* map = save_live_registers(sasm, 3); 925 926 // Called with store_parameter and not C abi 927 928 f.load_argument(1, r0); // r0,: array 929 f.load_argument(0, r1); // r1,: index 930 int call_offset = __ call_RT(r0, noreg, CAST_FROM_FN_PTR(address, load_flattened_array), r0, r1); 931 932 oop_maps = new OopMapSet(); 933 oop_maps->add_gc_map(call_offset, map); 934 restore_live_registers_except_r0(sasm); 935 936 // r0: loaded element at array[index] 937 __ verify_oop(r0); 938 } 939 break; 940 941 case store_flattened_array_id: 942 { 943 StubFrame f(sasm, "store_flattened_array", dont_gc_arguments); 944 OopMap* map = save_live_registers(sasm, 4); 945 946 // Called with store_parameter and not C abi 947 948 f.load_argument(2, r0); // r0: array 949 f.load_argument(1, r1); // r1: index 950 f.load_argument(0, r2); // r2: value 951 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, store_flattened_array), r0, r1, r2); 952 953 oop_maps = new OopMapSet(); 954 oop_maps->add_gc_map(call_offset, map); 955 restore_live_registers_except_r0(sasm); 956 } 957 break; 958 959 case substitutability_check_id: 960 { 961 StubFrame f(sasm, "substitutability_check", dont_gc_arguments); 962 OopMap* map = save_live_registers(sasm, 3); 963 964 // Called with store_parameter and not C abi 965 966 f.load_argument(1, r0); // r0,: left 967 f.load_argument(0, r1); // r1,: right 968 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, substitutability_check), r0, r1); 969 970 oop_maps = new OopMapSet(); 971 oop_maps->add_gc_map(call_offset, map); 972 restore_live_registers_except_r0(sasm); 973 974 // r0,: are the two operands substitutable 975 } 976 break; 977 978 979 980 case register_finalizer_id: 981 { 982 __ set_info("register_finalizer", dont_gc_arguments); 983 984 // This is called via call_runtime so the arguments 985 // will be place in C abi locations 986 987 __ verify_oop(c_rarg0); 988 989 // load the klass and check the has finalizer flag 990 Label register_finalizer; 991 Register t = r5; 992 __ load_klass(t, r0); 993 __ ldrw(t, Address(t, Klass::access_flags_offset())); 994 __ tbnz(t, exact_log2(JVM_ACC_HAS_FINALIZER), register_finalizer); 995 __ ret(lr); 996 997 __ bind(register_finalizer); 998 __ enter(); 999 OopMap* oop_map = save_live_registers(sasm); 1000 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, SharedRuntime::register_finalizer), r0); 1001 oop_maps = new OopMapSet(); 1002 oop_maps->add_gc_map(call_offset, oop_map); 1003 1004 // Now restore all the live registers 1005 restore_live_registers(sasm); 1006 1007 __ leave(); 1008 __ ret(lr); 1009 } 1010 break; 1011 1012 case throw_class_cast_exception_id: 1013 { StubFrame f(sasm, "throw_class_cast_exception", dont_gc_arguments); 1014 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_class_cast_exception), true); 1015 } 1016 break; 1017 1018 case throw_incompatible_class_change_error_id: 1019 { StubFrame f(sasm, "throw_incompatible_class_change_exception", dont_gc_arguments); 1020 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_incompatible_class_change_error), false); 1021 } 1022 break; 1023 1024 case throw_illegal_monitor_state_exception_id: 1025 { StubFrame f(sasm, "throw_illegal_monitor_state_exception", dont_gc_arguments); 1026 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_illegal_monitor_state_exception), false); 1027 } 1028 break; 1029 1030 case slow_subtype_check_id: 1031 { 1032 // Typical calling sequence: 1033 // __ push(klass_RInfo); // object klass or other subclass 1034 // __ push(sup_k_RInfo); // array element klass or other superclass 1035 // __ bl(slow_subtype_check); 1036 // Note that the subclass is pushed first, and is therefore deepest. 1037 enum layout { 1038 r0_off, r0_off_hi, 1039 r2_off, r2_off_hi, 1040 r4_off, r4_off_hi, 1041 r5_off, r5_off_hi, 1042 sup_k_off, sup_k_off_hi, 1043 klass_off, klass_off_hi, 1044 framesize, 1045 result_off = sup_k_off 1046 }; 1047 1048 __ set_info("slow_subtype_check", dont_gc_arguments); 1049 __ push(RegSet::of(r0, r2, r4, r5), sp); 1050 1051 // This is called by pushing args and not with C abi 1052 // __ ldr(r4, Address(sp, (klass_off) * VMRegImpl::stack_slot_size)); // subclass 1053 // __ ldr(r0, Address(sp, (sup_k_off) * VMRegImpl::stack_slot_size)); // superclass 1054 1055 __ ldp(r4, r0, Address(sp, (sup_k_off) * VMRegImpl::stack_slot_size)); 1056 1057 Label miss; 1058 __ check_klass_subtype_slow_path(r4, r0, r2, r5, NULL, &miss); 1059 1060 // fallthrough on success: 1061 __ mov(rscratch1, 1); 1062 __ str(rscratch1, Address(sp, (result_off) * VMRegImpl::stack_slot_size)); // result 1063 __ pop(RegSet::of(r0, r2, r4, r5), sp); 1064 __ ret(lr); 1065 1066 __ bind(miss); 1067 __ str(zr, Address(sp, (result_off) * VMRegImpl::stack_slot_size)); // result 1068 __ pop(RegSet::of(r0, r2, r4, r5), sp); 1069 __ ret(lr); 1070 } 1071 break; 1072 1073 case monitorenter_nofpu_id: 1074 save_fpu_registers = false; 1075 // fall through 1076 case monitorenter_id: 1077 { 1078 StubFrame f(sasm, "monitorenter", dont_gc_arguments); 1079 OopMap* map = save_live_registers(sasm, save_fpu_registers); 1080 1081 // Called with store_parameter and not C abi 1082 1083 f.load_argument(1, r0); // r0,: object 1084 f.load_argument(0, r1); // r1,: lock address 1085 1086 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, monitorenter), r0, r1); 1087 1088 oop_maps = new OopMapSet(); 1089 oop_maps->add_gc_map(call_offset, map); 1090 restore_live_registers(sasm, save_fpu_registers); 1091 } 1092 break; 1093 1094 case monitorexit_nofpu_id: 1095 save_fpu_registers = false; 1096 // fall through 1097 case monitorexit_id: 1098 { 1099 StubFrame f(sasm, "monitorexit", dont_gc_arguments); 1100 OopMap* map = save_live_registers(sasm, save_fpu_registers); 1101 1102 // Called with store_parameter and not C abi 1103 1104 f.load_argument(0, r0); // r0,: lock address 1105 1106 // note: really a leaf routine but must setup last java sp 1107 // => use call_RT for now (speed can be improved by 1108 // doing last java sp setup manually) 1109 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, monitorexit), r0); 1110 1111 oop_maps = new OopMapSet(); 1112 oop_maps->add_gc_map(call_offset, map); 1113 restore_live_registers(sasm, save_fpu_registers); 1114 } 1115 break; 1116 1117 case deoptimize_id: 1118 { 1119 StubFrame f(sasm, "deoptimize", dont_gc_arguments); 1120 OopMap* oop_map = save_live_registers(sasm); 1121 f.load_argument(0, c_rarg1); 1122 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, deoptimize), c_rarg1); 1123 1124 oop_maps = new OopMapSet(); 1125 oop_maps->add_gc_map(call_offset, oop_map); 1126 restore_live_registers(sasm); 1127 DeoptimizationBlob* deopt_blob = SharedRuntime::deopt_blob(); 1128 assert(deopt_blob != NULL, "deoptimization blob must have been created"); 1129 __ leave(); 1130 __ far_jump(RuntimeAddress(deopt_blob->unpack_with_reexecution())); 1131 } 1132 break; 1133 1134 case throw_range_check_failed_id: 1135 { StubFrame f(sasm, "range_check_failed", dont_gc_arguments); 1136 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_range_check_exception), true); 1137 } 1138 break; 1139 1140 case unwind_exception_id: 1141 { __ set_info("unwind_exception", dont_gc_arguments); 1142 // note: no stubframe since we are about to leave the current 1143 // activation and we are calling a leaf VM function only. 1144 generate_unwind_exception(sasm); 1145 } 1146 break; 1147 1148 case access_field_patching_id: 1149 { StubFrame f(sasm, "access_field_patching", dont_gc_arguments); 1150 // we should set up register map 1151 oop_maps = generate_patching(sasm, CAST_FROM_FN_PTR(address, access_field_patching)); 1152 } 1153 break; 1154 1155 case load_klass_patching_id: 1156 { StubFrame f(sasm, "load_klass_patching", dont_gc_arguments); 1157 // we should set up register map 1158 oop_maps = generate_patching(sasm, CAST_FROM_FN_PTR(address, move_klass_patching)); 1159 } 1160 break; 1161 1162 case load_mirror_patching_id: 1163 { StubFrame f(sasm, "load_mirror_patching", dont_gc_arguments); 1164 // we should set up register map 1165 oop_maps = generate_patching(sasm, CAST_FROM_FN_PTR(address, move_mirror_patching)); 1166 } 1167 break; 1168 1169 case load_appendix_patching_id: 1170 { StubFrame f(sasm, "load_appendix_patching", dont_gc_arguments); 1171 // we should set up register map 1172 oop_maps = generate_patching(sasm, CAST_FROM_FN_PTR(address, move_appendix_patching)); 1173 } 1174 break; 1175 1176 case handle_exception_nofpu_id: 1177 case handle_exception_id: 1178 { StubFrame f(sasm, "handle_exception", dont_gc_arguments); 1179 oop_maps = generate_handle_exception(id, sasm); 1180 } 1181 break; 1182 1183 case handle_exception_from_callee_id: 1184 { StubFrame f(sasm, "handle_exception_from_callee", dont_gc_arguments); 1185 oop_maps = generate_handle_exception(id, sasm); 1186 } 1187 break; 1188 1189 case throw_index_exception_id: 1190 { StubFrame f(sasm, "index_range_check_failed", dont_gc_arguments); 1191 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_index_exception), true); 1192 } 1193 break; 1194 1195 case throw_array_store_exception_id: 1196 { StubFrame f(sasm, "throw_array_store_exception", dont_gc_arguments); 1197 // tos + 0: link 1198 // + 1: return address 1199 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_array_store_exception), true); 1200 } 1201 break; 1202 1203 case predicate_failed_trap_id: 1204 { 1205 StubFrame f(sasm, "predicate_failed_trap", dont_gc_arguments); 1206 1207 OopMap* map = save_live_registers(sasm); 1208 1209 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, predicate_failed_trap)); 1210 oop_maps = new OopMapSet(); 1211 oop_maps->add_gc_map(call_offset, map); 1212 restore_live_registers(sasm); 1213 __ leave(); 1214 DeoptimizationBlob* deopt_blob = SharedRuntime::deopt_blob(); 1215 assert(deopt_blob != NULL, "deoptimization blob must have been created"); 1216 1217 __ far_jump(RuntimeAddress(deopt_blob->unpack_with_reexecution())); 1218 } 1219 break; 1220 1221 default: 1222 // FIXME: For unhandled trap_id this code fails with assert during vm intialization 1223 // rather than insert a call to unimplemented_entry 1224 { StubFrame f(sasm, "unimplemented entry", dont_gc_arguments); 1225 __ mov(r0, (int)id); 1226 __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, unimplemented_entry), r0); 1227 __ should_not_reach_here(); 1228 } 1229 break; 1230 } 1231 } 1232 1233 1234 return oop_maps; 1235 } 1236 1237 #undef __ 1238 1239 const char *Runtime1::pd_name_for_address(address entry) { Unimplemented(); return 0; }