1 /* 2 * Copyright (c) 1997, 2022, Oracle and/or its affiliates. All rights reserved. 3 * Copyright (c) 2014, 2020, 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 "compiler/oopMap.hpp" 28 #include "interpreter/interpreter.hpp" 29 #include "memory/resourceArea.hpp" 30 #include "memory/universe.hpp" 31 #include "oops/markWord.hpp" 32 #include "oops/method.hpp" 33 #include "oops/oop.inline.hpp" 34 #include "prims/methodHandles.hpp" 35 #include "runtime/frame.inline.hpp" 36 #include "runtime/handles.inline.hpp" 37 #include "runtime/javaCalls.hpp" 38 #include "runtime/monitorChunk.hpp" 39 #include "runtime/os.inline.hpp" 40 #include "runtime/signature.hpp" 41 #include "runtime/stackWatermarkSet.hpp" 42 #include "runtime/stubCodeGenerator.hpp" 43 #include "runtime/stubRoutines.hpp" 44 #include "vmreg_aarch64.inline.hpp" 45 #ifdef COMPILER1 46 #include "c1/c1_Runtime1.hpp" 47 #include "runtime/vframeArray.hpp" 48 #endif 49 50 #ifdef ASSERT 51 void RegisterMap::check_location_valid() { 52 } 53 #endif 54 55 56 // Profiling/safepoint support 57 58 bool frame::safe_for_sender(JavaThread *thread) { 59 address sp = (address)_sp; 60 address fp = (address)_fp; 61 address unextended_sp = (address)_unextended_sp; 62 63 // consider stack guards when trying to determine "safe" stack pointers 64 // sp must be within the usable part of the stack (not in guards) 65 if (!thread->is_in_usable_stack(sp)) { 66 return false; 67 } 68 69 // When we are running interpreted code the machine stack pointer, SP, is 70 // set low enough so that the Java expression stack can grow and shrink 71 // without ever exceeding the machine stack bounds. So, ESP >= SP. 72 73 // When we call out of an interpreted method, SP is incremented so that 74 // the space between SP and ESP is removed. The SP saved in the callee's 75 // frame is the SP *before* this increment. So, when we walk a stack of 76 // interpreter frames the sender's SP saved in a frame might be less than 77 // the SP at the point of call. 78 79 // So unextended sp must be within the stack but we need not to check 80 // that unextended sp >= sp 81 if (!thread->is_in_full_stack_checked(unextended_sp)) { 82 return false; 83 } 84 85 // an fp must be within the stack and above (but not equal) sp 86 // second evaluation on fp+ is added to handle situation where fp is -1 87 bool fp_safe = thread->is_in_stack_range_excl(fp, sp) && 88 thread->is_in_full_stack_checked(fp + (return_addr_offset * sizeof(void*))); 89 90 // We know sp/unextended_sp are safe only fp is questionable here 91 92 // If the current frame is known to the code cache then we can attempt to 93 // to construct the sender and do some validation of it. This goes a long way 94 // toward eliminating issues when we get in frame construction code 95 96 if (_cb != NULL ) { 97 98 // First check if frame is complete and tester is reliable 99 // Unfortunately we can only check frame complete for runtime stubs and nmethod 100 // other generic buffer blobs are more problematic so we just assume they are 101 // ok. adapter blobs never have a frame complete and are never ok. 102 103 if (!_cb->is_frame_complete_at(_pc)) { 104 if (_cb->is_nmethod() || _cb->is_adapter_blob() || _cb->is_runtime_stub()) { 105 return false; 106 } 107 } 108 109 // Could just be some random pointer within the codeBlob 110 if (!_cb->code_contains(_pc)) { 111 return false; 112 } 113 114 // Entry frame checks 115 if (is_entry_frame()) { 116 // an entry frame must have a valid fp. 117 return fp_safe && is_entry_frame_valid(thread); 118 } 119 120 intptr_t* sender_sp = NULL; 121 intptr_t* sender_unextended_sp = NULL; 122 address sender_pc = NULL; 123 intptr_t* saved_fp = NULL; 124 125 if (is_interpreted_frame()) { 126 // fp must be safe 127 if (!fp_safe) { 128 return false; 129 } 130 131 // for interpreted frames, the value below is the sender "raw" sp, 132 // which can be different from the sender unextended sp (the sp seen 133 // by the sender) because of current frame local variables 134 sender_sp = (intptr_t*) addr_at(sender_sp_offset); 135 sender_unextended_sp = (intptr_t*) this->fp()[interpreter_frame_sender_sp_offset]; 136 saved_fp = (intptr_t*) this->fp()[link_offset]; 137 sender_pc = pauth_strip_verifiable((address) this->fp()[return_addr_offset], (address)saved_fp); 138 139 } else { 140 // must be some sort of compiled/runtime frame 141 // fp does not have to be safe (although it could be check for c1?) 142 143 // check for a valid frame_size, otherwise we are unlikely to get a valid sender_pc 144 if (_cb->frame_size() <= 0) { 145 return false; 146 } 147 148 sender_sp = _unextended_sp + _cb->frame_size(); 149 // Is sender_sp safe? 150 if (!thread->is_in_full_stack_checked((address)sender_sp)) { 151 return false; 152 } 153 sender_unextended_sp = sender_sp; 154 // Note: frame::sender_sp_offset is only valid for compiled frame 155 saved_fp = (intptr_t*) *(sender_sp - frame::sender_sp_offset); 156 sender_pc = pauth_strip_verifiable((address) *(sender_sp-1), (address)saved_fp); 157 } 158 159 160 // If the potential sender is the interpreter then we can do some more checking 161 if (Interpreter::contains(sender_pc)) { 162 163 // fp is always saved in a recognizable place in any code we generate. However 164 // only if the sender is interpreted/call_stub (c1 too?) are we certain that the saved fp 165 // is really a frame pointer. 166 167 if (!thread->is_in_stack_range_excl((address)saved_fp, (address)sender_sp)) { 168 return false; 169 } 170 171 // construct the potential sender 172 173 frame sender(sender_sp, sender_unextended_sp, saved_fp, sender_pc); 174 175 return sender.is_interpreted_frame_valid(thread); 176 177 } 178 179 // We must always be able to find a recognizable pc 180 CodeBlob* sender_blob = CodeCache::find_blob_unsafe(sender_pc); 181 if (sender_pc == NULL || sender_blob == NULL) { 182 return false; 183 } 184 185 // Could be a zombie method 186 if (sender_blob->is_zombie() || sender_blob->is_unloaded()) { 187 return false; 188 } 189 190 // Could just be some random pointer within the codeBlob 191 if (!sender_blob->code_contains(sender_pc)) { 192 return false; 193 } 194 195 // We should never be able to see an adapter if the current frame is something from code cache 196 if (sender_blob->is_adapter_blob()) { 197 return false; 198 } 199 200 // Could be the call_stub 201 if (StubRoutines::returns_to_call_stub(sender_pc)) { 202 if (!thread->is_in_stack_range_excl((address)saved_fp, (address)sender_sp)) { 203 return false; 204 } 205 206 // construct the potential sender 207 208 frame sender(sender_sp, sender_unextended_sp, saved_fp, sender_pc); 209 210 // Validate the JavaCallWrapper an entry frame must have 211 address jcw = (address)sender.entry_frame_call_wrapper(); 212 213 return thread->is_in_stack_range_excl(jcw, (address)sender.fp()); 214 } 215 216 CompiledMethod* nm = sender_blob->as_compiled_method_or_null(); 217 if (nm != NULL) { 218 if (nm->is_deopt_mh_entry(sender_pc) || nm->is_deopt_entry(sender_pc) || 219 nm->method()->is_method_handle_intrinsic()) { 220 return false; 221 } 222 } 223 224 // If the frame size is 0 something (or less) is bad because every nmethod has a non-zero frame size 225 // because the return address counts against the callee's frame. 226 227 if (sender_blob->frame_size() <= 0) { 228 assert(!sender_blob->is_compiled(), "should count return address at least"); 229 return false; 230 } 231 232 // We should never be able to see anything here except an nmethod. If something in the 233 // code cache (current frame) is called by an entity within the code cache that entity 234 // should not be anything but the call stub (already covered), the interpreter (already covered) 235 // or an nmethod. 236 237 if (!sender_blob->is_compiled()) { 238 return false; 239 } 240 241 // Could put some more validation for the potential non-interpreted sender 242 // frame we'd create by calling sender if I could think of any. Wait for next crash in forte... 243 244 // One idea is seeing if the sender_pc we have is one that we'd expect to call to current cb 245 246 // We've validated the potential sender that would be created 247 return true; 248 } 249 250 // Must be native-compiled frame. Since sender will try and use fp to find 251 // linkages it must be safe 252 253 if (!fp_safe) { 254 return false; 255 } 256 257 // Will the pc we fetch be non-zero (which we'll find at the oldest frame) 258 259 if ( (address) this->fp()[return_addr_offset] == NULL) return false; 260 261 262 // could try and do some more potential verification of native frame if we could think of some... 263 264 return true; 265 266 } 267 268 void frame::patch_pc(Thread* thread, address pc) { 269 assert(_cb == CodeCache::find_blob(pc), "unexpected pc"); 270 address* pc_addr = &(((address*) sp())[-1]); 271 address signing_sp = (((address*) sp())[-2]); 272 address signed_pc = pauth_sign_return_address(pc, (address)signing_sp); 273 address pc_old = pauth_strip_verifiable(*pc_addr, (address)signing_sp); 274 if (TracePcPatching) { 275 tty->print("patch_pc at address " INTPTR_FORMAT " [" INTPTR_FORMAT " -> " INTPTR_FORMAT "]", 276 p2i(pc_addr), p2i(pc_old), p2i(pc)); 277 if (VM_Version::use_rop_protection()) { 278 tty->print(" [signed " INTPTR_FORMAT " -> " INTPTR_FORMAT "]", p2i(*pc_addr), p2i(signed_pc)); 279 } 280 tty->print_cr(""); 281 } 282 283 // Either the return address is the original one or we are going to 284 // patch in the same address that's already there. 285 assert(_pc == pc_old || pc == pc_old, "must be"); 286 *pc_addr = signed_pc; 287 address original_pc = CompiledMethod::get_deopt_original_pc(this); 288 if (original_pc != NULL) { 289 assert(original_pc == _pc, "expected original PC to be stored before patching"); 290 _deopt_state = is_deoptimized; 291 // leave _pc as is 292 } else { 293 _deopt_state = not_deoptimized; 294 _pc = pc; 295 } 296 } 297 298 bool frame::is_interpreted_frame() const { 299 return Interpreter::contains(pc()); 300 } 301 302 int frame::frame_size(RegisterMap* map) const { 303 frame sender = this->sender(map); 304 return sender.sp() - sp(); 305 } 306 307 intptr_t* frame::entry_frame_argument_at(int offset) const { 308 // convert offset to index to deal with tsi 309 int index = (Interpreter::expr_offset_in_bytes(offset)/wordSize); 310 // Entry frame's arguments are always in relation to unextended_sp() 311 return &unextended_sp()[index]; 312 } 313 314 // sender_sp 315 intptr_t* frame::interpreter_frame_sender_sp() const { 316 assert(is_interpreted_frame(), "interpreted frame expected"); 317 return (intptr_t*) at(interpreter_frame_sender_sp_offset); 318 } 319 320 void frame::set_interpreter_frame_sender_sp(intptr_t* sender_sp) { 321 assert(is_interpreted_frame(), "interpreted frame expected"); 322 ptr_at_put(interpreter_frame_sender_sp_offset, (intptr_t) sender_sp); 323 } 324 325 326 // monitor elements 327 328 BasicObjectLock* frame::interpreter_frame_monitor_begin() const { 329 return (BasicObjectLock*) addr_at(interpreter_frame_monitor_block_bottom_offset); 330 } 331 332 BasicObjectLock* frame::interpreter_frame_monitor_end() const { 333 BasicObjectLock* result = (BasicObjectLock*) *addr_at(interpreter_frame_monitor_block_top_offset); 334 // make sure the pointer points inside the frame 335 assert(sp() <= (intptr_t*) result, "monitor end should be above the stack pointer"); 336 assert((intptr_t*) result < fp(), "monitor end should be strictly below the frame pointer"); 337 return result; 338 } 339 340 void frame::interpreter_frame_set_monitor_end(BasicObjectLock* value) { 341 *((BasicObjectLock**)addr_at(interpreter_frame_monitor_block_top_offset)) = value; 342 } 343 344 // Used by template based interpreter deoptimization 345 void frame::interpreter_frame_set_last_sp(intptr_t* sp) { 346 *((intptr_t**)addr_at(interpreter_frame_last_sp_offset)) = sp; 347 } 348 349 frame frame::sender_for_entry_frame(RegisterMap* map) const { 350 assert(map != NULL, "map must be set"); 351 // Java frame called from C; skip all C frames and return top C 352 // frame of that chunk as the sender 353 JavaFrameAnchor* jfa = entry_frame_call_wrapper()->anchor(); 354 assert(!entry_frame_is_first(), "next Java fp must be non zero"); 355 assert(jfa->last_Java_sp() > sp(), "must be above this frame on stack"); 356 // Since we are walking the stack now this nested anchor is obviously walkable 357 // even if it wasn't when it was stacked. 358 jfa->make_walkable(); 359 map->clear(); 360 assert(map->include_argument_oops(), "should be set by clear"); 361 frame fr(jfa->last_Java_sp(), jfa->last_Java_fp(), jfa->last_Java_pc()); 362 fr.set_sp_is_trusted(); 363 364 return fr; 365 } 366 367 OptimizedEntryBlob::FrameData* OptimizedEntryBlob::frame_data_for_frame(const frame& frame) const { 368 ShouldNotCallThis(); 369 return nullptr; 370 } 371 372 bool frame::optimized_entry_frame_is_first() const { 373 ShouldNotCallThis(); 374 return false; 375 } 376 377 frame frame::sender_for_optimized_entry_frame(RegisterMap* map) const { 378 ShouldNotCallThis(); 379 return {}; 380 } 381 382 //------------------------------------------------------------------------------ 383 // frame::verify_deopt_original_pc 384 // 385 // Verifies the calculated original PC of a deoptimization PC for the 386 // given unextended SP. 387 #ifdef ASSERT 388 void frame::verify_deopt_original_pc(CompiledMethod* nm, intptr_t* unextended_sp) { 389 frame fr; 390 391 // This is ugly but it's better than to change {get,set}_original_pc 392 // to take an SP value as argument. And it's only a debugging 393 // method anyway. 394 fr._unextended_sp = unextended_sp; 395 396 address original_pc = nm->get_original_pc(&fr); 397 assert(nm->insts_contains_inclusive(original_pc), 398 "original PC must be in the main code section of the the compiled method (or must be immediately following it)"); 399 } 400 #endif 401 402 //------------------------------------------------------------------------------ 403 // frame::adjust_unextended_sp 404 void frame::adjust_unextended_sp() { 405 // On aarch64, sites calling method handle intrinsics and lambda forms are treated 406 // as any other call site. Therefore, no special action is needed when we are 407 // returning to any of these call sites. 408 409 if (_cb != NULL) { 410 CompiledMethod* sender_cm = _cb->as_compiled_method_or_null(); 411 if (sender_cm != NULL) { 412 // If the sender PC is a deoptimization point, get the original PC. 413 if (sender_cm->is_deopt_entry(_pc) || 414 sender_cm->is_deopt_mh_entry(_pc)) { 415 DEBUG_ONLY(verify_deopt_original_pc(sender_cm, _unextended_sp)); 416 } 417 } 418 } 419 } 420 421 //------------------------------------------------------------------------------ 422 // frame::update_map_with_saved_link 423 void frame::update_map_with_saved_link(RegisterMap* map, intptr_t** link_addr) { 424 // The interpreter and compiler(s) always save fp in a known 425 // location on entry. We must record where that location is 426 // so that if fp was live on callout from c2 we can find 427 // the saved copy no matter what it called. 428 429 // Since the interpreter always saves fp if we record where it is then 430 // we don't have to always save fp on entry and exit to c2 compiled 431 // code, on entry will be enough. 432 map->set_location(rfp->as_VMReg(), (address) link_addr); 433 // this is weird "H" ought to be at a higher address however the 434 // oopMaps seems to have the "H" regs at the same address and the 435 // vanilla register. 436 // XXXX make this go away 437 if (true) { 438 map->set_location(rfp->as_VMReg()->next(), (address) link_addr); 439 } 440 } 441 442 443 //------------------------------------------------------------------------------ 444 // frame::sender_for_interpreter_frame 445 frame frame::sender_for_interpreter_frame(RegisterMap* map) const { 446 // SP is the raw SP from the sender after adapter or interpreter 447 // extension. 448 intptr_t* sender_sp = this->sender_sp(); 449 450 // This is the sp before any possible extension (adapter/locals). 451 intptr_t* unextended_sp = interpreter_frame_sender_sp(); 452 453 #if COMPILER2_OR_JVMCI 454 if (map->update_map()) { 455 update_map_with_saved_link(map, (intptr_t**) addr_at(link_offset)); 456 } 457 #endif // COMPILER2_OR_JVMCI 458 459 // For ROP protection, Interpreter will have signed the sender_pc, but there is no requirement to authenticate it here. 460 address sender_pc = pauth_strip_verifiable(sender_pc_maybe_signed(), (address)link()); 461 462 return frame(sender_sp, unextended_sp, link(), sender_pc); 463 } 464 465 //------------------------------------------------------------------------------ 466 // frame::sender_for_compiled_frame 467 frame frame::sender_for_compiled_frame(RegisterMap* map) const { 468 // When the sp of a compiled frame is correct, we can get the correct sender sp 469 // by unextended sp + frame size. 470 // For the following two scenarios, the sp of a compiled frame is correct: 471 // a) This compiled frame is built from the anchor. 472 // b) This compiled frame is built from a callee frame, and the callee frame can 473 // calculate its sp correctly. 474 // 475 // For b), if the callee frame is a native code frame (such as leaf call), the sp of 476 // the compiled frame cannot be calculated correctly. There is currently no suitable 477 // solution to solve this problem perfectly. But when PreserveFramePointer is enabled, 478 // we can get the correct sender sp by fp + 2 (that is sender_sp()). 479 480 assert(_cb->frame_size() >= 0, "must have non-zero frame size"); 481 intptr_t* l_sender_sp = (!PreserveFramePointer || _sp_is_trusted) ? unextended_sp() + _cb->frame_size() 482 : sender_sp(); 483 intptr_t* unextended_sp = l_sender_sp; 484 485 // the return_address is always the word on the stack 486 487 // For ROP protection, C1/C2 will have signed the sender_pc, but there is no requirement to authenticate it here. 488 address sender_pc = pauth_strip_verifiable((address) *(l_sender_sp-1), (address) *(l_sender_sp-2)); 489 490 intptr_t** saved_fp_addr = (intptr_t**) (l_sender_sp - frame::sender_sp_offset); 491 492 // assert (sender_sp() == l_sender_sp, "should be"); 493 // assert (*saved_fp_addr == link(), "should be"); 494 495 if (map->update_map()) { 496 // Tell GC to use argument oopmaps for some runtime stubs that need it. 497 // For C1, the runtime stub might not have oop maps, so set this flag 498 // outside of update_register_map. 499 map->set_include_argument_oops(_cb->caller_must_gc_arguments(map->thread())); 500 if (_cb->oop_maps() != NULL) { 501 OopMapSet::update_register_map(this, map); 502 } 503 504 // Since the prolog does the save and restore of FP there is no 505 // oopmap for it so we must fill in its location as if there was 506 // an oopmap entry since if our caller was compiled code there 507 // could be live jvm state in it. 508 update_map_with_saved_link(map, saved_fp_addr); 509 } 510 511 return frame(l_sender_sp, unextended_sp, *saved_fp_addr, sender_pc); 512 } 513 514 //------------------------------------------------------------------------------ 515 // frame::sender_raw 516 frame frame::sender_raw(RegisterMap* map) const { 517 // Default is we done have to follow them. The sender_for_xxx will 518 // update it accordingly 519 map->set_include_argument_oops(false); 520 521 if (is_entry_frame()) 522 return sender_for_entry_frame(map); 523 if (is_interpreted_frame()) 524 return sender_for_interpreter_frame(map); 525 assert(_cb == CodeCache::find_blob(pc()),"Must be the same"); 526 527 // This test looks odd: why is it not is_compiled_frame() ? That's 528 // because stubs also have OOP maps. 529 if (_cb != NULL) { 530 return sender_for_compiled_frame(map); 531 } 532 533 // Must be native-compiled frame, i.e. the marshaling code for native 534 // methods that exists in the core system. 535 536 // Native code may or may not have signed the return address, we have no way to be sure or what 537 // signing methods they used. Instead, just ensure the stripped value is used. 538 539 return frame(sender_sp(), link(), sender_pc()); 540 } 541 542 frame frame::sender(RegisterMap* map) const { 543 frame result = sender_raw(map); 544 545 if (map->process_frames()) { 546 StackWatermarkSet::on_iteration(map->thread(), result); 547 } 548 549 return result; 550 } 551 552 bool frame::is_interpreted_frame_valid(JavaThread* thread) const { 553 assert(is_interpreted_frame(), "Not an interpreted frame"); 554 // These are reasonable sanity checks 555 if (fp() == 0 || (intptr_t(fp()) & (wordSize-1)) != 0) { 556 return false; 557 } 558 if (sp() == 0 || (intptr_t(sp()) & (wordSize-1)) != 0) { 559 return false; 560 } 561 if (fp() + interpreter_frame_initial_sp_offset < sp()) { 562 return false; 563 } 564 // These are hacks to keep us out of trouble. 565 // The problem with these is that they mask other problems 566 if (fp() <= sp()) { // this attempts to deal with unsigned comparison above 567 return false; 568 } 569 570 // do some validation of frame elements 571 572 // first the method 573 574 Method* m = *interpreter_frame_method_addr(); 575 576 // validate the method we'd find in this potential sender 577 if (!Method::is_valid_method(m)) return false; 578 579 // stack frames shouldn't be much larger than max_stack elements 580 // this test requires the use of unextended_sp which is the sp as seen by 581 // the current frame, and not sp which is the "raw" pc which could point 582 // further because of local variables of the callee method inserted after 583 // method arguments 584 if (fp() - unextended_sp() > 1024 + m->max_stack()*Interpreter::stackElementSize) { 585 return false; 586 } 587 588 // validate bci/bcx 589 590 address bcp = interpreter_frame_bcp(); 591 if (m->validate_bci_from_bcp(bcp) < 0) { 592 return false; 593 } 594 595 // validate constantPoolCache* 596 ConstantPoolCache* cp = *interpreter_frame_cache_addr(); 597 if (MetaspaceObj::is_valid(cp) == false) return false; 598 599 // validate locals 600 601 address locals = (address) *interpreter_frame_locals_addr(); 602 return thread->is_in_stack_range_incl(locals, (address)fp()); 603 } 604 605 BasicType frame::interpreter_frame_result(oop* oop_result, jvalue* value_result) { 606 assert(is_interpreted_frame(), "interpreted frame expected"); 607 Method* method = interpreter_frame_method(); 608 BasicType type = method->result_type(); 609 610 intptr_t* tos_addr; 611 if (method->is_native()) { 612 // TODO : ensure AARCH64 does the same as Intel here i.e. push v0 then r0 613 // Prior to calling into the runtime to report the method_exit the possible 614 // return value is pushed to the native stack. If the result is a jfloat/jdouble 615 // then ST0 is saved before EAX/EDX. See the note in generate_native_result 616 tos_addr = (intptr_t*)sp(); 617 if (type == T_FLOAT || type == T_DOUBLE) { 618 // This is times two because we do a push(ltos) after pushing XMM0 619 // and that takes two interpreter stack slots. 620 tos_addr += 2 * Interpreter::stackElementWords; 621 } 622 } else { 623 tos_addr = (intptr_t*)interpreter_frame_tos_address(); 624 } 625 626 switch (type) { 627 case T_OBJECT : 628 case T_ARRAY : { 629 oop obj; 630 if (method->is_native()) { 631 obj = cast_to_oop(at(interpreter_frame_oop_temp_offset)); 632 } else { 633 oop* obj_p = (oop*)tos_addr; 634 obj = (obj_p == NULL) ? (oop)NULL : *obj_p; 635 } 636 assert(Universe::is_in_heap_or_null(obj), "sanity check"); 637 *oop_result = obj; 638 break; 639 } 640 case T_BOOLEAN : value_result->z = *(jboolean*)tos_addr; break; 641 case T_BYTE : value_result->b = *(jbyte*)tos_addr; break; 642 case T_CHAR : value_result->c = *(jchar*)tos_addr; break; 643 case T_SHORT : value_result->s = *(jshort*)tos_addr; break; 644 case T_INT : value_result->i = *(jint*)tos_addr; break; 645 case T_LONG : value_result->j = *(jlong*)tos_addr; break; 646 case T_FLOAT : { 647 value_result->f = *(jfloat*)tos_addr; 648 break; 649 } 650 case T_DOUBLE : value_result->d = *(jdouble*)tos_addr; break; 651 case T_VOID : /* Nothing to do */ break; 652 default : ShouldNotReachHere(); 653 } 654 655 return type; 656 } 657 658 659 intptr_t* frame::interpreter_frame_tos_at(jint offset) const { 660 int index = (Interpreter::expr_offset_in_bytes(offset)/wordSize); 661 return &interpreter_frame_tos_address()[index]; 662 } 663 664 #ifndef PRODUCT 665 666 #define DESCRIBE_FP_OFFSET(name) \ 667 values.describe(frame_no, fp() + frame::name##_offset, #name) 668 669 void frame::describe_pd(FrameValues& values, int frame_no) { 670 if (is_interpreted_frame()) { 671 DESCRIBE_FP_OFFSET(interpreter_frame_sender_sp); 672 DESCRIBE_FP_OFFSET(interpreter_frame_last_sp); 673 DESCRIBE_FP_OFFSET(interpreter_frame_method); 674 DESCRIBE_FP_OFFSET(interpreter_frame_mdp); 675 DESCRIBE_FP_OFFSET(interpreter_frame_mirror); 676 DESCRIBE_FP_OFFSET(interpreter_frame_cache); 677 DESCRIBE_FP_OFFSET(interpreter_frame_locals); 678 DESCRIBE_FP_OFFSET(interpreter_frame_bcp); 679 DESCRIBE_FP_OFFSET(interpreter_frame_initial_sp); 680 } 681 } 682 #endif 683 684 intptr_t *frame::initial_deoptimization_info() { 685 // Not used on aarch64, but we must return something. 686 return NULL; 687 } 688 689 intptr_t* frame::real_fp() const { 690 if (_cb != NULL) { 691 // use the frame size if valid 692 int size = _cb->frame_size(); 693 if (size > 0) { 694 return unextended_sp() + size; 695 } 696 } 697 // else rely on fp() 698 assert(! is_compiled_frame(), "unknown compiled frame size"); 699 return fp(); 700 } 701 702 #undef DESCRIBE_FP_OFFSET 703 704 #define DESCRIBE_FP_OFFSET(name) \ 705 { \ 706 uintptr_t *p = (uintptr_t *)fp; \ 707 printf(INTPTR_FORMAT " " INTPTR_FORMAT " %s\n", \ 708 (uintptr_t)(p + frame::name##_offset), \ 709 p[frame::name##_offset], #name); \ 710 } 711 712 static THREAD_LOCAL uintptr_t nextfp; 713 static THREAD_LOCAL uintptr_t nextpc; 714 static THREAD_LOCAL uintptr_t nextsp; 715 static THREAD_LOCAL RegisterMap *reg_map; 716 717 static void printbc(Method *m, intptr_t bcx) { 718 const char *name; 719 char buf[16]; 720 if (m->validate_bci_from_bcp((address)bcx) < 0 721 || !m->contains((address)bcx)) { 722 name = "???"; 723 snprintf(buf, sizeof buf, "(bad)"); 724 } else { 725 int bci = m->bci_from((address)bcx); 726 snprintf(buf, sizeof buf, "%d", bci); 727 name = Bytecodes::name(m->code_at(bci)); 728 } 729 ResourceMark rm; 730 printf("%s : %s ==> %s\n", m->name_and_sig_as_C_string(), buf, name); 731 } 732 733 void internal_pf(uintptr_t sp, uintptr_t fp, uintptr_t pc, uintptr_t bcx) { 734 if (! fp) 735 return; 736 737 DESCRIBE_FP_OFFSET(return_addr); 738 DESCRIBE_FP_OFFSET(link); 739 DESCRIBE_FP_OFFSET(interpreter_frame_sender_sp); 740 DESCRIBE_FP_OFFSET(interpreter_frame_last_sp); 741 DESCRIBE_FP_OFFSET(interpreter_frame_method); 742 DESCRIBE_FP_OFFSET(interpreter_frame_mdp); 743 DESCRIBE_FP_OFFSET(interpreter_frame_cache); 744 DESCRIBE_FP_OFFSET(interpreter_frame_locals); 745 DESCRIBE_FP_OFFSET(interpreter_frame_bcp); 746 DESCRIBE_FP_OFFSET(interpreter_frame_initial_sp); 747 uintptr_t *p = (uintptr_t *)fp; 748 749 // We want to see all frames, native and Java. For compiled and 750 // interpreted frames we have special information that allows us to 751 // unwind them; for everything else we assume that the native frame 752 // pointer chain is intact. 753 frame this_frame((intptr_t*)sp, (intptr_t*)fp, (address)pc); 754 if (this_frame.is_compiled_frame() || 755 this_frame.is_interpreted_frame()) { 756 frame sender = this_frame.sender(reg_map); 757 nextfp = (uintptr_t)sender.fp(); 758 nextpc = (uintptr_t)sender.pc(); 759 nextsp = (uintptr_t)sender.unextended_sp(); 760 } else { 761 nextfp = p[frame::link_offset]; 762 nextpc = p[frame::return_addr_offset]; 763 nextsp = (uintptr_t)&p[frame::sender_sp_offset]; 764 } 765 766 if (bcx == -1ULL) 767 bcx = p[frame::interpreter_frame_bcp_offset]; 768 769 if (Interpreter::contains((address)pc)) { 770 Method* m = (Method*)p[frame::interpreter_frame_method_offset]; 771 if(m && m->is_method()) { 772 printbc(m, bcx); 773 } else 774 printf("not a Method\n"); 775 } else { 776 CodeBlob *cb = CodeCache::find_blob((address)pc); 777 if (cb != NULL) { 778 if (cb->is_nmethod()) { 779 ResourceMark rm; 780 nmethod* nm = (nmethod*)cb; 781 printf("nmethod %s\n", nm->method()->name_and_sig_as_C_string()); 782 } else if (cb->name()) { 783 printf("CodeBlob %s\n", cb->name()); 784 } 785 } 786 } 787 } 788 789 extern "C" void npf() { 790 CodeBlob *cb = CodeCache::find_blob((address)nextpc); 791 // C2 does not always chain the frame pointers when it can, instead 792 // preferring to use fixed offsets from SP, so a simple leave() does 793 // not work. Instead, it adds the frame size to SP then pops FP and 794 // LR. We have to do the same thing to get a good call chain. 795 if (cb && cb->frame_size()) 796 nextfp = nextsp + wordSize * (cb->frame_size() - 2); 797 internal_pf (nextsp, nextfp, nextpc, -1); 798 } 799 800 extern "C" void pf(uintptr_t sp, uintptr_t fp, uintptr_t pc, 801 uintptr_t bcx, uintptr_t thread) { 802 if (!reg_map) { 803 reg_map = NEW_C_HEAP_OBJ(RegisterMap, mtInternal); 804 ::new (reg_map) RegisterMap((JavaThread*)thread, false); 805 } else { 806 *reg_map = RegisterMap((JavaThread*)thread, false); 807 } 808 809 { 810 CodeBlob *cb = CodeCache::find_blob((address)pc); 811 if (cb && cb->frame_size()) 812 fp = sp + wordSize * (cb->frame_size() - 2); 813 } 814 internal_pf(sp, fp, pc, bcx); 815 } 816 817 // support for printing out where we are in a Java method 818 // needs to be passed current fp and bcp register values 819 // prints method name, bc index and bytecode name 820 extern "C" void pm(uintptr_t fp, uintptr_t bcx) { 821 DESCRIBE_FP_OFFSET(interpreter_frame_method); 822 uintptr_t *p = (uintptr_t *)fp; 823 Method* m = (Method*)p[frame::interpreter_frame_method_offset]; 824 printbc(m, bcx); 825 } 826 827 #ifndef PRODUCT 828 // This is a generic constructor which is only used by pns() in debug.cpp. 829 frame::frame(void* sp, void* fp, void* pc) { 830 init((intptr_t*)sp, (intptr_t*)fp, (address)pc); 831 } 832 833 #endif 834 835 void JavaFrameAnchor::make_walkable() { 836 // last frame set? 837 if (last_Java_sp() == NULL) return; 838 // already walkable? 839 if (walkable()) return; 840 vmassert(last_Java_sp() != NULL, "not called from Java code?"); 841 vmassert(last_Java_pc() == NULL, "already walkable"); 842 _last_Java_pc = (address)_last_Java_sp[-1]; 843 vmassert(walkable(), "something went wrong"); 844 } 845