1 /* 2 * Copyright (c) 1997, 2020, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "code/codeCache.hpp" 27 #include "interpreter/interpreter.hpp" 28 #include "memory/resourceArea.hpp" 29 #include "memory/universe.hpp" 30 #include "oops/markWord.hpp" 31 #include "oops/method.hpp" 32 #include "oops/oop.inline.hpp" 33 #include "prims/methodHandles.hpp" 34 #include "runtime/frame.inline.hpp" 35 #include "runtime/handles.inline.hpp" 36 #include "runtime/javaCalls.hpp" 37 #include "runtime/monitorChunk.hpp" 38 #include "runtime/signature.hpp" 39 #include "runtime/stubCodeGenerator.hpp" 40 #include "runtime/stubRoutines.hpp" 41 #include "vmreg_sparc.inline.hpp" 42 #ifdef COMPILER1 43 #include "c1/c1_Runtime1.hpp" 44 #include "runtime/vframeArray.hpp" 45 #endif 46 47 void RegisterMap::pd_clear() { 48 if (_thread->has_last_Java_frame()) { 49 frame fr = _thread->last_frame(); 50 _window = fr.sp(); 51 } else { 52 _window = NULL; 53 } 54 _younger_window = NULL; 55 } 56 57 58 // Unified register numbering scheme: each 32-bits counts as a register 59 // number, so all the V9 registers take 2 slots. 60 const static int R_L_nums[] = {0+040,2+040,4+040,6+040,8+040,10+040,12+040,14+040}; 61 const static int R_I_nums[] = {0+060,2+060,4+060,6+060,8+060,10+060,12+060,14+060}; 62 const static int R_O_nums[] = {0+020,2+020,4+020,6+020,8+020,10+020,12+020,14+020}; 63 const static int R_G_nums[] = {0+000,2+000,4+000,6+000,8+000,10+000,12+000,14+000}; 64 static RegisterMap::LocationValidType bad_mask = 0; 65 static RegisterMap::LocationValidType R_LIO_mask = 0; 66 static bool register_map_inited = false; 67 68 static void register_map_init() { 69 if (!register_map_inited) { 70 register_map_inited = true; 71 int i; 72 for (i = 0; i < 8; i++) { 73 assert(R_L_nums[i] < RegisterMap::location_valid_type_size, "in first chunk"); 74 assert(R_I_nums[i] < RegisterMap::location_valid_type_size, "in first chunk"); 75 assert(R_O_nums[i] < RegisterMap::location_valid_type_size, "in first chunk"); 76 assert(R_G_nums[i] < RegisterMap::location_valid_type_size, "in first chunk"); 77 } 78 79 bad_mask |= (1LL << R_O_nums[6]); // SP 80 bad_mask |= (1LL << R_O_nums[7]); // cPC 81 bad_mask |= (1LL << R_I_nums[6]); // FP 82 bad_mask |= (1LL << R_I_nums[7]); // rPC 83 bad_mask |= (1LL << R_G_nums[2]); // TLS 84 bad_mask |= (1LL << R_G_nums[7]); // reserved by libthread 85 86 for (i = 0; i < 8; i++) { 87 R_LIO_mask |= (1LL << R_L_nums[i]); 88 R_LIO_mask |= (1LL << R_I_nums[i]); 89 R_LIO_mask |= (1LL << R_O_nums[i]); 90 } 91 } 92 } 93 94 95 address RegisterMap::pd_location(VMReg regname) const { 96 register_map_init(); 97 98 assert(regname->is_reg(), "sanity check"); 99 // Only the GPRs get handled this way 100 if( !regname->is_Register()) 101 return NULL; 102 103 // don't talk about bad registers 104 if ((bad_mask & ((LocationValidType)1 << regname->value())) != 0) { 105 return NULL; 106 } 107 108 // Convert to a GPR 109 Register reg; 110 int second_word = 0; 111 // 32-bit registers for in, out and local 112 if (!regname->is_concrete()) { 113 // HMM ought to return NULL for any non-concrete (odd) vmreg 114 // this all tied up in the fact we put out double oopMaps for 115 // register locations. When that is fixed we'd will return NULL 116 // (or assert here). 117 reg = regname->prev()->as_Register(); 118 second_word = sizeof(jint); 119 } else { 120 reg = regname->as_Register(); 121 } 122 if (reg->is_out()) { 123 return _younger_window == NULL ? NULL : 124 second_word + (address)&_younger_window[reg->after_save()->sp_offset_in_saved_window()]; 125 } 126 if (reg->is_local() || reg->is_in()) { 127 assert(_window != NULL, "Window should be available"); 128 return second_word + (address)&_window[reg->sp_offset_in_saved_window()]; 129 } 130 // Only the window'd GPRs get handled this way; not the globals. 131 return NULL; 132 } 133 134 135 #ifdef ASSERT 136 void RegisterMap::check_location_valid() { 137 register_map_init(); 138 assert((_location_valid[0] & bad_mask) == 0, "cannot have special locations for SP,FP,TLS,etc."); 139 } 140 #endif 141 142 // We are shifting windows. That means we are moving all %i to %o, 143 // getting rid of all current %l, and keeping all %g. This is only 144 // complicated if any of the location pointers for these are valid. 145 // The normal case is that everything is in its standard register window 146 // home, and _location_valid[0] is zero. In that case, this routine 147 // does exactly nothing. 148 void RegisterMap::shift_individual_registers() { 149 if (!update_map()) return; // this only applies to maps with locations 150 register_map_init(); 151 check_location_valid(); 152 153 LocationValidType lv = _location_valid[0]; 154 LocationValidType lv0 = lv; 155 156 lv &= ~R_LIO_mask; // clear %l, %o, %i regs 157 158 // if we cleared some non-%g locations, we may have to do some shifting 159 if (lv != lv0) { 160 // copy %i0-%i5 to %o0-%o5, if they have special locations 161 // This can happen in within stubs which spill argument registers 162 // around a dynamic link operation, such as resolve_opt_virtual_call. 163 for (int i = 0; i < 8; i++) { 164 if (lv0 & (1LL << R_I_nums[i])) { 165 _location[R_O_nums[i]] = _location[R_I_nums[i]]; 166 lv |= (1LL << R_O_nums[i]); 167 } 168 } 169 } 170 171 _location_valid[0] = lv; 172 check_location_valid(); 173 } 174 175 bool frame::safe_for_sender(JavaThread *thread) { 176 177 address _SP = (address) sp(); 178 address _FP = (address) fp(); 179 address _UNEXTENDED_SP = (address) unextended_sp(); 180 181 // consider stack guards when trying to determine "safe" stack pointers 182 // sp must be within the usable part of the stack (not in guards) 183 if (!thread->is_in_usable_stack(_SP)) { 184 return false; 185 } 186 187 // unextended sp must be within the stack and above or equal sp 188 if (!thread->is_in_stack_range_incl(_UNEXTENDED_SP, _SP)) { 189 return false; 190 } 191 192 // an fp must be within the stack and above (but not equal) sp 193 bool fp_safe = thread->is_in_stack_range_excl(_FP, _SP); 194 195 // We know sp/unextended_sp are safe only fp is questionable here 196 197 // If the current frame is known to the code cache then we can attempt to 198 // to construct the sender and do some validation of it. This goes a long way 199 // toward eliminating issues when we get in frame construction code 200 201 if (_cb != NULL ) { 202 203 // First check if frame is complete and tester is reliable 204 // Unfortunately we can only check frame complete for runtime stubs and nmethod 205 // other generic buffer blobs are more problematic so we just assume they are 206 // ok. adapter blobs never have a frame complete and are never ok. 207 208 if (!_cb->is_frame_complete_at(_pc)) { 209 if (_cb->is_compiled() || _cb->is_adapter_blob() || _cb->is_runtime_stub()) { 210 return false; 211 } 212 } 213 214 // Could just be some random pointer within the codeBlob 215 if (!_cb->code_contains(_pc)) { 216 return false; 217 } 218 219 // Entry frame checks 220 if (is_entry_frame()) { 221 // an entry frame must have a valid fp. 222 return fp_safe && is_entry_frame_valid(thread); 223 } 224 225 intptr_t* younger_sp = sp(); 226 intptr_t* _SENDER_SP = sender_sp(); // sender is actually just _FP 227 bool adjusted_stack = is_interpreted_frame(); 228 229 address sender_pc = (address)younger_sp[I7->sp_offset_in_saved_window()] + pc_return_offset; 230 231 232 // We must always be able to find a recognizable pc 233 CodeBlob* sender_blob = CodeCache::find_blob_unsafe(sender_pc); 234 if (sender_pc == NULL || sender_blob == NULL) { 235 return false; 236 } 237 238 // Could be a zombie method 239 if (sender_blob->is_zombie() || sender_blob->is_unloaded()) { 240 return false; 241 } 242 243 // It should be safe to construct the sender though it might not be valid 244 245 frame sender(_SENDER_SP, younger_sp, adjusted_stack); 246 247 // Do we have a valid fp? 248 address sender_fp = (address) sender.fp(); 249 250 // an fp must be within the stack and above (but not equal) current frame's _FP 251 252 if (!thread->is_in_stack_range_excl(sender_fp, _FP)) { 253 return false; 254 } 255 256 257 // If the potential sender is the interpreter then we can do some more checking 258 if (Interpreter::contains(sender_pc)) { 259 return sender.is_interpreted_frame_valid(thread); 260 } 261 262 // Could just be some random pointer within the codeBlob 263 if (!sender.cb()->code_contains(sender_pc)) { 264 return false; 265 } 266 267 // We should never be able to see an adapter if the current frame is something from code cache 268 if (sender_blob->is_adapter_blob()) { 269 return false; 270 } 271 272 if (sender.is_entry_frame()) { 273 // Validate the JavaCallWrapper an entry frame must have 274 address jcw = (address)sender.entry_frame_call_wrapper(); 275 276 return thread->is_in_stack_range_excl(jcw, sender_fp); 277 } 278 279 // If the frame size is 0 something (or less) is bad because every nmethod has a non-zero frame size 280 // because you must allocate window space 281 282 if (sender_blob->frame_size() <= 0) { 283 assert(!sender_blob->is_compiled(), "should count return address at least"); 284 return false; 285 } 286 287 // The sender should positively be an nmethod or call_stub. On sparc we might in fact see something else. 288 // The cause of this is because at a save instruction the O7 we get is a leftover from an earlier 289 // window use. So if a runtime stub creates two frames (common in fastdebug/debug) then we see the 290 // stale pc. So if the sender blob is not something we'd expect we have little choice but to declare 291 // the stack unwalkable. pd_get_top_frame_for_signal_handler tries to recover from this by unwinding 292 // that initial frame and retrying. 293 294 if (!sender_blob->is_compiled()) { 295 return false; 296 } 297 298 // Could put some more validation for the potential non-interpreted sender 299 // frame we'd create by calling sender if I could think of any. Wait for next crash in forte... 300 301 // One idea is seeing if the sender_pc we have is one that we'd expect to call to current cb 302 303 // We've validated the potential sender that would be created 304 305 return true; 306 307 } 308 309 // Must be native-compiled frame. Since sender will try and use fp to find 310 // linkages it must be safe 311 312 if (!fp_safe) return false; 313 314 // could try and do some more potential verification of native frame if we could think of some... 315 316 return true; 317 } 318 319 // constructors 320 321 // Construct an unpatchable, deficient frame 322 void frame::init(intptr_t* sp, address pc, CodeBlob* cb) { 323 assert( (((intptr_t)sp & (wordSize-1)) == 0), "frame constructor passed an invalid sp"); 324 _sp = sp; 325 _younger_sp = NULL; 326 _pc = pc; 327 _cb = cb; 328 _sp_adjustment_by_callee = 0; 329 assert(pc == NULL && cb == NULL || pc != NULL, "can't have a cb and no pc!"); 330 if (_cb == NULL && _pc != NULL ) { 331 _cb = CodeCache::find_blob(_pc); 332 } 333 _deopt_state = unknown; 334 } 335 336 frame::frame(intptr_t* sp, unpatchable_t, address pc, CodeBlob* cb) { 337 init(sp, pc, cb); 338 } 339 340 frame::frame(intptr_t* sp, intptr_t* younger_sp, bool younger_frame_is_interpreted) : 341 _sp(sp), 342 _younger_sp(younger_sp), 343 _deopt_state(unknown), 344 _sp_adjustment_by_callee(0) { 345 if (younger_sp == NULL) { 346 // make a deficient frame which doesn't know where its PC is 347 _pc = NULL; 348 _cb = NULL; 349 } else { 350 _pc = (address)younger_sp[I7->sp_offset_in_saved_window()] + pc_return_offset; 351 assert( (intptr_t*)younger_sp[FP->sp_offset_in_saved_window()] == (intptr_t*)((intptr_t)sp - STACK_BIAS), "younger_sp must be valid"); 352 // Any frame we ever build should always "safe" therefore we should not have to call 353 // find_blob_unsafe 354 // In case of native stubs, the pc retrieved here might be 355 // wrong. (the _last_native_pc will have the right value) 356 // So do not put add any asserts on the _pc here. 357 } 358 359 if (_pc != NULL) 360 _cb = CodeCache::find_blob(_pc); 361 362 // Check for MethodHandle call sites. 363 if (_cb != NULL) { 364 CompiledMethod* nm = _cb->as_compiled_method_or_null(); 365 if (nm != NULL) { 366 if (nm->is_deopt_mh_entry(_pc) || nm->is_method_handle_return(_pc)) { 367 _sp_adjustment_by_callee = (intptr_t*) ((intptr_t) sp[L7_mh_SP_save->sp_offset_in_saved_window()] + STACK_BIAS) - sp; 368 // The SP is already adjusted by this MH call site, don't 369 // overwrite this value with the wrong interpreter value. 370 younger_frame_is_interpreted = false; 371 } 372 } 373 } 374 375 if (younger_frame_is_interpreted) { 376 // compute adjustment to this frame's SP made by its interpreted callee 377 _sp_adjustment_by_callee = (intptr_t*) ((intptr_t) younger_sp[I5_savedSP->sp_offset_in_saved_window()] + STACK_BIAS) - sp; 378 } 379 380 // It is important that the frame is fully constructed when we do 381 // this lookup as get_deopt_original_pc() needs a correct value for 382 // unextended_sp() which uses _sp_adjustment_by_callee. 383 if (_pc != NULL) { 384 address original_pc = CompiledMethod::get_deopt_original_pc(this); 385 if (original_pc != NULL) { 386 _pc = original_pc; 387 _deopt_state = is_deoptimized; 388 } else { 389 _deopt_state = not_deoptimized; 390 } 391 } 392 } 393 394 #ifndef PRODUCT 395 // This is a generic constructor which is only used by pns() in debug.cpp. 396 frame::frame(void* sp, void* fp, void* pc) { 397 init((intptr_t*)sp, (address)pc, NULL); 398 } 399 400 extern "C" void findpc(intptr_t x); 401 402 void frame::pd_ps() { 403 intptr_t* curr_sp = sp(); 404 intptr_t* prev_sp = curr_sp - 1; 405 intptr_t *pc = NULL; 406 intptr_t *next_pc = NULL; 407 int count = 0; 408 tty->print_cr("register window backtrace from " INTPTR_FORMAT ":", p2i(curr_sp)); 409 while (curr_sp != NULL && ((intptr_t)curr_sp & 7) == 0 && curr_sp > prev_sp && curr_sp < prev_sp+1000) { 410 pc = next_pc; 411 next_pc = (intptr_t*) curr_sp[I7->sp_offset_in_saved_window()]; 412 tty->print("[%d] curr_sp=" INTPTR_FORMAT " pc=", count, p2i(curr_sp)); 413 findpc((intptr_t)pc); 414 if (WizardMode && Verbose) { 415 // print register window contents also 416 tty->print_cr(" L0..L7: {" 417 INTPTR_FORMAT " " INTPTR_FORMAT " " INTPTR_FORMAT " " INTPTR_FORMAT " " 418 INTPTR_FORMAT " " INTPTR_FORMAT " " INTPTR_FORMAT " " INTPTR_FORMAT " ", 419 curr_sp[0+0], curr_sp[0+1], curr_sp[0+2], curr_sp[0+3], 420 curr_sp[0+4], curr_sp[0+5], curr_sp[0+6], curr_sp[0+7]); 421 tty->print_cr(" I0..I7: {" 422 INTPTR_FORMAT " " INTPTR_FORMAT " " INTPTR_FORMAT " " INTPTR_FORMAT " " 423 INTPTR_FORMAT " " INTPTR_FORMAT " " INTPTR_FORMAT " " INTPTR_FORMAT " ", 424 curr_sp[8+0], curr_sp[8+1], curr_sp[8+2], curr_sp[8+3], 425 curr_sp[8+4], curr_sp[8+5], curr_sp[8+6], curr_sp[8+7]); 426 // (and print stack frame contents too??) 427 428 CodeBlob *b = CodeCache::find_blob((address) pc); 429 if (b != NULL) { 430 if (b->is_nmethod()) { 431 Method* m = ((nmethod*)b)->method(); 432 int nlocals = m->max_locals(); 433 int nparams = m->size_of_parameters(); 434 tty->print_cr("compiled java method (locals = %d, params = %d)", nlocals, nparams); 435 } 436 } 437 } 438 prev_sp = curr_sp; 439 curr_sp = (intptr_t *)curr_sp[FP->sp_offset_in_saved_window()]; 440 curr_sp = (intptr_t *)((intptr_t)curr_sp + STACK_BIAS); 441 count += 1; 442 } 443 if (curr_sp != NULL) 444 tty->print("[%d] curr_sp=" INTPTR_FORMAT " [bogus sp!]", count, p2i(curr_sp)); 445 } 446 447 #endif // PRODUCT 448 449 bool frame::is_interpreted_frame() const { 450 return Interpreter::contains(pc()); 451 } 452 453 // sender_sp 454 455 intptr_t* frame::interpreter_frame_sender_sp() const { 456 assert(is_interpreted_frame(), "interpreted frame expected"); 457 return fp(); 458 } 459 460 void frame::set_interpreter_frame_sender_sp(intptr_t* sender_sp) { 461 assert(is_interpreted_frame(), "interpreted frame expected"); 462 Unimplemented(); 463 } 464 465 frame frame::sender_for_entry_frame(RegisterMap *map) const { 466 assert(map != NULL, "map must be set"); 467 // Java frame called from C; skip all C frames and return top C 468 // frame of that chunk as the sender 469 JavaFrameAnchor* jfa = entry_frame_call_wrapper()->anchor(); 470 assert(!entry_frame_is_first(), "next Java fp must be non zero"); 471 assert(jfa->last_Java_sp() > _sp, "must be above this frame on stack"); 472 intptr_t* last_Java_sp = jfa->last_Java_sp(); 473 // Since we are walking the stack now this nested anchor is obviously walkable 474 // even if it wasn't when it was stacked. 475 if (!jfa->walkable()) { 476 // Capture _last_Java_pc (if needed) and mark anchor walkable. 477 jfa->capture_last_Java_pc(_sp); 478 } 479 assert(jfa->last_Java_pc() != NULL, "No captured pc!"); 480 map->clear(); 481 map->make_integer_regs_unsaved(); 482 map->shift_window(last_Java_sp, NULL); 483 assert(map->include_argument_oops(), "should be set by clear"); 484 return frame(last_Java_sp, frame::unpatchable, jfa->last_Java_pc()); 485 } 486 487 frame frame::sender_for_interpreter_frame(RegisterMap *map) const { 488 ShouldNotCallThis(); 489 return sender(map); 490 } 491 492 frame frame::sender_for_compiled_frame(RegisterMap *map) const { 493 ShouldNotCallThis(); 494 return sender(map); 495 } 496 497 frame frame::sender(RegisterMap* map) const { 498 assert(map != NULL, "map must be set"); 499 500 assert(CodeCache::find_blob_unsafe(_pc) == _cb, "inconsistent"); 501 502 // Default is not to follow arguments; update it accordingly below 503 map->set_include_argument_oops(false); 504 505 if (is_entry_frame()) return sender_for_entry_frame(map); 506 507 intptr_t* younger_sp = sp(); 508 intptr_t* sp = sender_sp(); 509 510 // Note: The version of this operation on any platform with callee-save 511 // registers must update the register map (if not null). 512 // In order to do this correctly, the various subtypes of 513 // of frame (interpreted, compiled, glue, native), 514 // must be distinguished. There is no need on SPARC for 515 // such distinctions, because all callee-save registers are 516 // preserved for all frames via SPARC-specific mechanisms. 517 // 518 // *** HOWEVER, *** if and when we make any floating-point 519 // registers callee-saved, then we will have to copy over 520 // the RegisterMap update logic from the Intel code. 521 522 // The constructor of the sender must know whether this frame is interpreted so it can set the 523 // sender's _sp_adjustment_by_callee field. An osr adapter frame was originally 524 // interpreted but its pc is in the code cache (for c1 -> osr_frame_return_id stub), so it must be 525 // explicitly recognized. 526 527 528 bool frame_is_interpreted = is_interpreted_frame(); 529 if (frame_is_interpreted) { 530 map->make_integer_regs_unsaved(); 531 map->shift_window(sp, younger_sp); 532 } else if (_cb != NULL) { 533 // Update the locations of implicitly saved registers to be their 534 // addresses in the register save area. 535 // For %o registers, the addresses of %i registers in the next younger 536 // frame are used. 537 map->shift_window(sp, younger_sp); 538 if (map->update_map()) { 539 // Tell GC to use argument oopmaps for some runtime stubs that need it. 540 // For C1, the runtime stub might not have oop maps, so set this flag 541 // outside of update_register_map. 542 map->set_include_argument_oops(_cb->caller_must_gc_arguments(map->thread())); 543 if (_cb->oop_maps() != NULL) { 544 OopMapSet::update_register_map(this, map); 545 } 546 } 547 } 548 return frame(sp, younger_sp, frame_is_interpreted); 549 } 550 551 552 void frame::patch_pc(Thread* thread, address pc) { 553 assert(_cb == CodeCache::find_blob(pc), "unexpected pc"); 554 vmassert(_deopt_state != unknown, "frame is unpatchable"); 555 if (thread == Thread::current()) { 556 StubRoutines::Sparc::flush_callers_register_windows_func()(); 557 } 558 if (TracePcPatching) { 559 // QQQ this assert is invalid (or too strong anyway) sice _pc could 560 // be original pc and frame could have the deopt pc. 561 // assert(_pc == *O7_addr() + pc_return_offset, "frame has wrong pc"); 562 tty->print_cr("patch_pc at address " INTPTR_FORMAT " [" INTPTR_FORMAT " -> " INTPTR_FORMAT "]", 563 p2i(O7_addr()), p2i(_pc), p2i(pc)); 564 } 565 *O7_addr() = pc - pc_return_offset; 566 address original_pc = CompiledMethod::get_deopt_original_pc(this); 567 if (original_pc != NULL) { 568 assert(original_pc == _pc, "expected original to be stored before patching"); 569 _deopt_state = is_deoptimized; 570 } else { 571 _deopt_state = not_deoptimized; 572 } 573 } 574 575 576 static bool sp_is_valid(intptr_t* old_sp, intptr_t* young_sp, intptr_t* sp) { 577 return (((intptr_t)sp & (2*wordSize-1)) == 0 && 578 sp <= old_sp && 579 sp >= young_sp); 580 } 581 582 583 /* 584 Find the (biased) sp that is just younger than old_sp starting at sp. 585 If not found return NULL. Register windows are assumed to be flushed. 586 */ 587 intptr_t* frame::next_younger_sp_or_null(intptr_t* old_sp, intptr_t* sp) { 588 589 intptr_t* previous_sp = NULL; 590 intptr_t* orig_sp = sp; 591 592 int max_frames = (old_sp - sp) / 16; // Minimum frame size is 16 593 int max_frame2 = max_frames; 594 while(sp != old_sp && sp_is_valid(old_sp, orig_sp, sp)) { 595 if (max_frames-- <= 0) 596 // too many frames have gone by; invalid parameters given to this function 597 break; 598 previous_sp = sp; 599 sp = (intptr_t*)sp[FP->sp_offset_in_saved_window()]; 600 sp = (intptr_t*)((intptr_t)sp + STACK_BIAS); 601 } 602 603 return (sp == old_sp ? previous_sp : NULL); 604 } 605 606 /* 607 Determine if "sp" is a valid stack pointer. "sp" is assumed to be younger than 608 "valid_sp". So if "sp" is valid itself then it should be possible to walk frames 609 from "sp" to "valid_sp". The assumption is that the registers windows for the 610 thread stack in question are flushed. 611 */ 612 bool frame::is_valid_stack_pointer(intptr_t* valid_sp, intptr_t* sp) { 613 return next_younger_sp_or_null(valid_sp, sp) != NULL; 614 } 615 616 bool frame::is_interpreted_frame_valid(JavaThread* thread) const { 617 assert(is_interpreted_frame(), "Not an interpreted frame"); 618 // These are reasonable sanity checks 619 if (fp() == 0 || (intptr_t(fp()) & (2*wordSize-1)) != 0) { 620 return false; 621 } 622 if (sp() == 0 || (intptr_t(sp()) & (2*wordSize-1)) != 0) { 623 return false; 624 } 625 626 const intptr_t interpreter_frame_initial_sp_offset = interpreter_frame_vm_local_words; 627 if (fp() + interpreter_frame_initial_sp_offset < sp()) { 628 return false; 629 } 630 // These are hacks to keep us out of trouble. 631 // The problem with these is that they mask other problems 632 if (fp() <= sp()) { // this attempts to deal with unsigned comparison above 633 return false; 634 } 635 // do some validation of frame elements 636 637 // first the method 638 639 Method* m = *interpreter_frame_method_addr(); 640 641 // validate the method we'd find in this potential sender 642 if (!Method::is_valid_method(m)) return false; 643 644 // stack frames shouldn't be much larger than max_stack elements 645 646 if (fp() - unextended_sp() > 1024 + m->max_stack()*Interpreter::stackElementSize) { 647 return false; 648 } 649 650 // validate bci/bcp 651 652 address bcp = interpreter_frame_bcp(); 653 if (m->validate_bci_from_bcp(bcp) < 0) { 654 return false; 655 } 656 657 // validate ConstantPoolCache* 658 ConstantPoolCache* cp = *interpreter_frame_cache_addr(); 659 if (MetaspaceObj::is_valid(cp) == false) return false; 660 661 // validate locals 662 663 address locals = (address) *interpreter_frame_locals_addr(); 664 return thread->is_in_stack_range_incl(locals, (address)fp()); 665 } 666 667 668 // Windows have been flushed on entry (but not marked). Capture the pc that 669 // is the return address to the frame that contains "sp" as its stack pointer. 670 // This pc resides in the called of the frame corresponding to "sp". 671 // As a side effect we mark this JavaFrameAnchor as having flushed the windows. 672 // This side effect lets us mark stacked JavaFrameAnchors (stacked in the 673 // call_helper) as flushed when we have flushed the windows for the most 674 // recent (i.e. current) JavaFrameAnchor. This saves useless flushing calls 675 // and lets us find the pc just once rather than multiple times as it did 676 // in the bad old _post_Java_state days. 677 // 678 void JavaFrameAnchor::capture_last_Java_pc(intptr_t* sp) { 679 if (last_Java_sp() != NULL && last_Java_pc() == NULL) { 680 // try and find the sp just younger than _last_Java_sp 681 intptr_t* _post_Java_sp = frame::next_younger_sp_or_null(last_Java_sp(), sp); 682 // Really this should never fail otherwise VM call must have non-standard 683 // frame linkage (bad) or stack is not properly flushed (worse). 684 guarantee(_post_Java_sp != NULL, "bad stack!"); 685 _last_Java_pc = (address) _post_Java_sp[ I7->sp_offset_in_saved_window()] + frame::pc_return_offset; 686 687 } 688 set_window_flushed(); 689 } 690 691 void JavaFrameAnchor::make_walkable(JavaThread* thread) { 692 if (walkable()) return; 693 // Eventually make an assert 694 guarantee(Thread::current() == (Thread*)thread, "only current thread can flush its registers"); 695 // We always flush in case the profiler wants it but we won't mark 696 // the windows as flushed unless we have a last_Java_frame 697 intptr_t* sp = StubRoutines::Sparc::flush_callers_register_windows_func()(); 698 if (last_Java_sp() != NULL ) { 699 capture_last_Java_pc(sp); 700 } 701 } 702 703 intptr_t* frame::entry_frame_argument_at(int offset) const { 704 // convert offset to index to deal with tsi 705 int index = (Interpreter::expr_offset_in_bytes(offset)/wordSize); 706 707 intptr_t* LSP = (intptr_t*) sp()[Lentry_args->sp_offset_in_saved_window()]; 708 return &LSP[index+1]; 709 } 710 711 712 BasicType frame::interpreter_frame_result(oop* oop_result, jvalue* value_result) { 713 assert(is_interpreted_frame(), "interpreted frame expected"); 714 Method* method = interpreter_frame_method(); 715 BasicType type = method->result_type(); 716 717 if (method->is_native()) { 718 // Prior to notifying the runtime of the method_exit the possible result 719 // value is saved to l_scratch and d_scratch. 720 721 intptr_t* l_scratch = fp() + interpreter_frame_l_scratch_fp_offset; 722 intptr_t* d_scratch = fp() + interpreter_frame_d_scratch_fp_offset; 723 724 address l_addr = (address)l_scratch; 725 // On 64-bit the result for 1/8/16/32-bit result types is in the other 726 // word half 727 l_addr += wordSize/2; 728 729 switch (type) { 730 case T_OBJECT: 731 case T_ARRAY: { 732 oop obj = cast_to_oop(at(interpreter_frame_oop_temp_offset)); 733 assert(obj == NULL || Universe::heap()->is_in(obj), "sanity check"); 734 *oop_result = obj; 735 break; 736 } 737 738 case T_BOOLEAN : { jint* p = (jint*)l_addr; value_result->z = (jboolean)((*p) & 0x1); break; } 739 case T_BYTE : { jint* p = (jint*)l_addr; value_result->b = (jbyte)((*p) & 0xff); break; } 740 case T_CHAR : { jint* p = (jint*)l_addr; value_result->c = (jchar)((*p) & 0xffff); break; } 741 case T_SHORT : { jint* p = (jint*)l_addr; value_result->s = (jshort)((*p) & 0xffff); break; } 742 case T_INT : value_result->i = *(jint*)l_addr; break; 743 case T_LONG : value_result->j = *(jlong*)l_scratch; break; 744 case T_FLOAT : value_result->f = *(jfloat*)d_scratch; break; 745 case T_DOUBLE : value_result->d = *(jdouble*)d_scratch; break; 746 case T_VOID : /* Nothing to do */ break; 747 default : ShouldNotReachHere(); 748 } 749 } else { 750 intptr_t* tos_addr = interpreter_frame_tos_address(); 751 752 switch(type) { 753 case T_OBJECT: 754 case T_ARRAY: { 755 oop obj = cast_to_oop(*tos_addr); 756 assert(obj == NULL || Universe::heap()->is_in(obj), "sanity check"); 757 *oop_result = obj; 758 break; 759 } 760 case T_BOOLEAN : { jint* p = (jint*)tos_addr; value_result->z = (jboolean)((*p) & 0x1); break; } 761 case T_BYTE : { jint* p = (jint*)tos_addr; value_result->b = (jbyte)((*p) & 0xff); break; } 762 case T_CHAR : { jint* p = (jint*)tos_addr; value_result->c = (jchar)((*p) & 0xffff); break; } 763 case T_SHORT : { jint* p = (jint*)tos_addr; value_result->s = (jshort)((*p) & 0xffff); break; } 764 case T_INT : value_result->i = *(jint*)tos_addr; break; 765 case T_LONG : value_result->j = *(jlong*)tos_addr; break; 766 case T_FLOAT : value_result->f = *(jfloat*)tos_addr; break; 767 case T_DOUBLE : value_result->d = *(jdouble*)tos_addr; break; 768 case T_VOID : /* Nothing to do */ break; 769 default : ShouldNotReachHere(); 770 } 771 }; 772 773 return type; 774 } 775 776 // Lesp pointer is one word lower than the top item on the stack. 777 intptr_t* frame::interpreter_frame_tos_at(jint offset) const { 778 int index = (Interpreter::expr_offset_in_bytes(offset)/wordSize) - 1; 779 return &interpreter_frame_tos_address()[index]; 780 } 781 782 783 #ifndef PRODUCT 784 785 #define DESCRIBE_FP_OFFSET(name) \ 786 values.describe(frame_no, fp() + frame::name##_offset, #name) 787 788 void frame::describe_pd(FrameValues& values, int frame_no) { 789 for (int w = 0; w < frame::register_save_words; w++) { 790 values.describe(frame_no, sp() + w, err_msg("register save area word %d", w), 1); 791 } 792 793 if (is_interpreted_frame()) { 794 DESCRIBE_FP_OFFSET(interpreter_frame_d_scratch_fp); 795 DESCRIBE_FP_OFFSET(interpreter_frame_l_scratch_fp); 796 DESCRIBE_FP_OFFSET(interpreter_frame_mirror); 797 DESCRIBE_FP_OFFSET(interpreter_frame_oop_temp); 798 799 // esp, according to Lesp (e.g. not depending on bci), if seems valid 800 intptr_t* esp = *interpreter_frame_esp_addr(); 801 if ((esp >= sp()) && (esp < fp())) { 802 values.describe(-1, esp, "*Lesp"); 803 } 804 } 805 806 if (!is_compiled_frame()) { 807 if (frame::callee_aggregate_return_pointer_words != 0) { 808 values.describe(frame_no, sp() + frame::callee_aggregate_return_pointer_sp_offset, "callee_aggregate_return_pointer_word"); 809 } 810 for (int w = 0; w < frame::callee_register_argument_save_area_words; w++) { 811 values.describe(frame_no, sp() + frame::callee_register_argument_save_area_sp_offset + w, 812 err_msg("callee_register_argument_save_area_words %d", w)); 813 } 814 } 815 } 816 817 #endif 818 819 intptr_t *frame::initial_deoptimization_info() { 820 // unused... but returns fp() to minimize changes introduced by 7087445 821 return fp(); 822 }