1 /* 2 * Copyright (c) 1997, 2010, 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 "incls/_precompiled.incl" 26 # include "incls/_frame_sparc.cpp.incl" 27 28 void RegisterMap::pd_clear() { 29 if (_thread->has_last_Java_frame()) { 30 frame fr = _thread->last_frame(); 31 _window = fr.sp(); 32 } else { 33 _window = NULL; 34 } 35 _younger_window = NULL; 36 } 37 38 39 // Unified register numbering scheme: each 32-bits counts as a register 40 // number, so all the V9 registers take 2 slots. 41 const static int R_L_nums[] = {0+040,2+040,4+040,6+040,8+040,10+040,12+040,14+040}; 42 const static int R_I_nums[] = {0+060,2+060,4+060,6+060,8+060,10+060,12+060,14+060}; 43 const static int R_O_nums[] = {0+020,2+020,4+020,6+020,8+020,10+020,12+020,14+020}; 44 const static int R_G_nums[] = {0+000,2+000,4+000,6+000,8+000,10+000,12+000,14+000}; 45 static RegisterMap::LocationValidType bad_mask = 0; 46 static RegisterMap::LocationValidType R_LIO_mask = 0; 47 static bool register_map_inited = false; 48 49 static void register_map_init() { 50 if (!register_map_inited) { 51 register_map_inited = true; 52 int i; 53 for (i = 0; i < 8; i++) { 54 assert(R_L_nums[i] < RegisterMap::location_valid_type_size, "in first chunk"); 55 assert(R_I_nums[i] < RegisterMap::location_valid_type_size, "in first chunk"); 56 assert(R_O_nums[i] < RegisterMap::location_valid_type_size, "in first chunk"); 57 assert(R_G_nums[i] < RegisterMap::location_valid_type_size, "in first chunk"); 58 } 59 60 bad_mask |= (1LL << R_O_nums[6]); // SP 61 bad_mask |= (1LL << R_O_nums[7]); // cPC 62 bad_mask |= (1LL << R_I_nums[6]); // FP 63 bad_mask |= (1LL << R_I_nums[7]); // rPC 64 bad_mask |= (1LL << R_G_nums[2]); // TLS 65 bad_mask |= (1LL << R_G_nums[7]); // reserved by libthread 66 67 for (i = 0; i < 8; i++) { 68 R_LIO_mask |= (1LL << R_L_nums[i]); 69 R_LIO_mask |= (1LL << R_I_nums[i]); 70 R_LIO_mask |= (1LL << R_O_nums[i]); 71 } 72 } 73 } 74 75 76 address RegisterMap::pd_location(VMReg regname) const { 77 register_map_init(); 78 79 assert(regname->is_reg(), "sanity check"); 80 // Only the GPRs get handled this way 81 if( !regname->is_Register()) 82 return NULL; 83 84 // don't talk about bad registers 85 if ((bad_mask & ((LocationValidType)1 << regname->value())) != 0) { 86 return NULL; 87 } 88 89 // Convert to a GPR 90 Register reg; 91 int second_word = 0; 92 // 32-bit registers for in, out and local 93 if (!regname->is_concrete()) { 94 // HMM ought to return NULL for any non-concrete (odd) vmreg 95 // this all tied up in the fact we put out double oopMaps for 96 // register locations. When that is fixed we'd will return NULL 97 // (or assert here). 98 reg = regname->prev()->as_Register(); 99 #ifdef _LP64 100 second_word = sizeof(jint); 101 #else 102 return NULL; 103 #endif // _LP64 104 } else { 105 reg = regname->as_Register(); 106 } 107 if (reg->is_out()) { 108 assert(_younger_window != NULL, "Younger window should be available"); 109 return second_word + (address)&_younger_window[reg->after_save()->sp_offset_in_saved_window()]; 110 } 111 if (reg->is_local() || reg->is_in()) { 112 assert(_window != NULL, "Window should be available"); 113 return second_word + (address)&_window[reg->sp_offset_in_saved_window()]; 114 } 115 // Only the window'd GPRs get handled this way; not the globals. 116 return NULL; 117 } 118 119 120 #ifdef ASSERT 121 void RegisterMap::check_location_valid() { 122 register_map_init(); 123 assert((_location_valid[0] & bad_mask) == 0, "cannot have special locations for SP,FP,TLS,etc."); 124 } 125 #endif 126 127 // We are shifting windows. That means we are moving all %i to %o, 128 // getting rid of all current %l, and keeping all %g. This is only 129 // complicated if any of the location pointers for these are valid. 130 // The normal case is that everything is in its standard register window 131 // home, and _location_valid[0] is zero. In that case, this routine 132 // does exactly nothing. 133 void RegisterMap::shift_individual_registers() { 134 if (!update_map()) return; // this only applies to maps with locations 135 register_map_init(); 136 check_location_valid(); 137 138 LocationValidType lv = _location_valid[0]; 139 LocationValidType lv0 = lv; 140 141 lv &= ~R_LIO_mask; // clear %l, %o, %i regs 142 143 // if we cleared some non-%g locations, we may have to do some shifting 144 if (lv != lv0) { 145 // copy %i0-%i5 to %o0-%o5, if they have special locations 146 // This can happen in within stubs which spill argument registers 147 // around a dynamic link operation, such as resolve_opt_virtual_call. 148 for (int i = 0; i < 8; i++) { 149 if (lv0 & (1LL << R_I_nums[i])) { 150 _location[R_O_nums[i]] = _location[R_I_nums[i]]; 151 lv |= (1LL << R_O_nums[i]); 152 } 153 } 154 } 155 156 _location_valid[0] = lv; 157 check_location_valid(); 158 } 159 160 bool frame::safe_for_sender(JavaThread *thread) { 161 162 address _SP = (address) sp(); 163 address _FP = (address) fp(); 164 address _UNEXTENDED_SP = (address) unextended_sp(); 165 // sp must be within the stack 166 bool sp_safe = (_SP <= thread->stack_base()) && 167 (_SP >= thread->stack_base() - thread->stack_size()); 168 169 if (!sp_safe) { 170 return false; 171 } 172 173 // unextended sp must be within the stack and above or equal sp 174 bool unextended_sp_safe = (_UNEXTENDED_SP <= thread->stack_base()) && 175 (_UNEXTENDED_SP >= _SP); 176 177 if (!unextended_sp_safe) return false; 178 179 // an fp must be within the stack and above (but not equal) sp 180 bool fp_safe = (_FP <= thread->stack_base()) && 181 (_FP > _SP); 182 183 // We know sp/unextended_sp are safe only fp is questionable here 184 185 // If the current frame is known to the code cache then we can attempt to 186 // to construct the sender and do some validation of it. This goes a long way 187 // toward eliminating issues when we get in frame construction code 188 189 if (_cb != NULL ) { 190 191 // First check if frame is complete and tester is reliable 192 // Unfortunately we can only check frame complete for runtime stubs and nmethod 193 // other generic buffer blobs are more problematic so we just assume they are 194 // ok. adapter blobs never have a frame complete and are never ok. 195 196 if (!_cb->is_frame_complete_at(_pc)) { 197 if (_cb->is_nmethod() || _cb->is_adapter_blob() || _cb->is_runtime_stub()) { 198 return false; 199 } 200 } 201 202 // Entry frame checks 203 if (is_entry_frame()) { 204 // an entry frame must have a valid fp. 205 206 if (!fp_safe) { 207 return false; 208 } 209 210 // Validate the JavaCallWrapper an entry frame must have 211 212 address jcw = (address)entry_frame_call_wrapper(); 213 214 bool jcw_safe = (jcw <= thread->stack_base()) && ( jcw > _FP); 215 216 return jcw_safe; 217 218 } 219 220 intptr_t* younger_sp = sp(); 221 intptr_t* _SENDER_SP = sender_sp(); // sender is actually just _FP 222 bool adjusted_stack = is_interpreted_frame(); 223 224 address sender_pc = (address)younger_sp[I7->sp_offset_in_saved_window()] + pc_return_offset; 225 226 227 // We must always be able to find a recognizable pc 228 CodeBlob* sender_blob = CodeCache::find_blob_unsafe(sender_pc); 229 if (sender_pc == NULL || sender_blob == NULL) { 230 return false; 231 } 232 233 // It should be safe to construct the sender though it might not be valid 234 235 frame sender(_SENDER_SP, younger_sp, adjusted_stack); 236 237 // Do we have a valid fp? 238 address sender_fp = (address) sender.fp(); 239 240 // an fp must be within the stack and above (but not equal) current frame's _FP 241 242 bool sender_fp_safe = (sender_fp <= thread->stack_base()) && 243 (sender_fp > _FP); 244 245 if (!sender_fp_safe) { 246 return false; 247 } 248 249 250 // If the potential sender is the interpreter then we can do some more checking 251 if (Interpreter::contains(sender_pc)) { 252 return sender.is_interpreted_frame_valid(thread); 253 } 254 255 // Could just be some random pointer within the codeBlob 256 if (!sender.cb()->code_contains(sender_pc)) { 257 return false; 258 } 259 260 // We should never be able to see an adapter if the current frame is something from code cache 261 if (sender_blob->is_adapter_blob()) { 262 return false; 263 } 264 265 if( sender.is_entry_frame()) { 266 // Validate the JavaCallWrapper an entry frame must have 267 268 address jcw = (address)sender.entry_frame_call_wrapper(); 269 270 bool jcw_safe = (jcw <= thread->stack_base()) && ( jcw > sender_fp); 271 272 return jcw_safe; 273 } 274 275 // If the frame size is 0 something is bad because every nmethod has a non-zero frame size 276 // because you must allocate window space 277 278 if (sender_blob->frame_size() == 0) { 279 assert(!sender_blob->is_nmethod(), "should count return address at least"); 280 return false; 281 } 282 283 // The sender should positively be an nmethod or call_stub. On sparc we might in fact see something else. 284 // The cause of this is because at a save instruction the O7 we get is a leftover from an earlier 285 // window use. So if a runtime stub creates two frames (common in fastdebug/jvmg) then we see the 286 // stale pc. So if the sender blob is not something we'd expect we have little choice but to declare 287 // the stack unwalkable. pd_get_top_frame_for_signal_handler tries to recover from this by unwinding 288 // that initial frame and retrying. 289 290 if (!sender_blob->is_nmethod()) { 291 return false; 292 } 293 294 // Could put some more validation for the potential non-interpreted sender 295 // frame we'd create by calling sender if I could think of any. Wait for next crash in forte... 296 297 // One idea is seeing if the sender_pc we have is one that we'd expect to call to current cb 298 299 // We've validated the potential sender that would be created 300 301 return true; 302 303 } 304 305 // Must be native-compiled frame. Since sender will try and use fp to find 306 // linkages it must be safe 307 308 if (!fp_safe) return false; 309 310 // could try and do some more potential verification of native frame if we could think of some... 311 312 return true; 313 } 314 315 // constructors 316 317 // Construct an unpatchable, deficient frame 318 frame::frame(intptr_t* sp, unpatchable_t, address pc, CodeBlob* cb) { 319 #ifdef _LP64 320 assert( (((intptr_t)sp & (wordSize-1)) == 0), "frame constructor passed an invalid sp"); 321 #endif 322 _sp = sp; 323 _younger_sp = NULL; 324 _pc = pc; 325 _cb = cb; 326 _sp_adjustment_by_callee = 0; 327 assert(pc == NULL && cb == NULL || pc != NULL, "can't have a cb and no pc!"); 328 if (_cb == NULL && _pc != NULL ) { 329 _cb = CodeCache::find_blob(_pc); 330 } 331 _deopt_state = unknown; 332 #ifdef ASSERT 333 if ( _cb != NULL && _cb->is_nmethod()) { 334 // Without a valid unextended_sp() we can't convert the pc to "original" 335 assert(!((nmethod*)_cb)->is_deopt_pc(_pc), "invariant broken"); 336 } 337 #endif // ASSERT 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 nmethod* nm = _cb->as_nmethod_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 = nmethod::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 bool frame::is_interpreted_frame() const { 395 return Interpreter::contains(pc()); 396 } 397 398 // sender_sp 399 400 intptr_t* frame::interpreter_frame_sender_sp() const { 401 assert(is_interpreted_frame(), "interpreted frame expected"); 402 return fp(); 403 } 404 405 #ifndef CC_INTERP 406 void frame::set_interpreter_frame_sender_sp(intptr_t* sender_sp) { 407 assert(is_interpreted_frame(), "interpreted frame expected"); 408 Unimplemented(); 409 } 410 #endif // CC_INTERP 411 412 413 #ifdef ASSERT 414 // Debugging aid 415 static frame nth_sender(int n) { 416 frame f = JavaThread::current()->last_frame(); 417 418 for(int i = 0; i < n; ++i) 419 f = f.sender((RegisterMap*)NULL); 420 421 printf("first frame %d\n", f.is_first_frame() ? 1 : 0); 422 printf("interpreted frame %d\n", f.is_interpreted_frame() ? 1 : 0); 423 printf("java frame %d\n", f.is_java_frame() ? 1 : 0); 424 printf("entry frame %d\n", f.is_entry_frame() ? 1 : 0); 425 printf("native frame %d\n", f.is_native_frame() ? 1 : 0); 426 if (f.is_compiled_frame()) { 427 if (f.is_deoptimized_frame()) 428 printf("deoptimized frame 1\n"); 429 else 430 printf("compiled frame 1\n"); 431 } 432 433 return f; 434 } 435 #endif 436 437 438 frame frame::sender_for_entry_frame(RegisterMap *map) const { 439 assert(map != NULL, "map must be set"); 440 // Java frame called from C; skip all C frames and return top C 441 // frame of that chunk as the sender 442 JavaFrameAnchor* jfa = entry_frame_call_wrapper()->anchor(); 443 assert(!entry_frame_is_first(), "next Java fp must be non zero"); 444 assert(jfa->last_Java_sp() > _sp, "must be above this frame on stack"); 445 intptr_t* last_Java_sp = jfa->last_Java_sp(); 446 // Since we are walking the stack now this nested anchor is obviously walkable 447 // even if it wasn't when it was stacked. 448 if (!jfa->walkable()) { 449 // Capture _last_Java_pc (if needed) and mark anchor walkable. 450 jfa->capture_last_Java_pc(_sp); 451 } 452 assert(jfa->last_Java_pc() != NULL, "No captured pc!"); 453 map->clear(); 454 map->make_integer_regs_unsaved(); 455 map->shift_window(last_Java_sp, NULL); 456 assert(map->include_argument_oops(), "should be set by clear"); 457 return frame(last_Java_sp, frame::unpatchable, jfa->last_Java_pc()); 458 } 459 460 frame frame::sender_for_interpreter_frame(RegisterMap *map) const { 461 ShouldNotCallThis(); 462 return sender(map); 463 } 464 465 frame frame::sender_for_compiled_frame(RegisterMap *map) const { 466 ShouldNotCallThis(); 467 return sender(map); 468 } 469 470 frame frame::sender(RegisterMap* map) const { 471 assert(map != NULL, "map must be set"); 472 473 assert(CodeCache::find_blob_unsafe(_pc) == _cb, "inconsistent"); 474 475 // Default is not to follow arguments; update it accordingly below 476 map->set_include_argument_oops(false); 477 478 if (is_entry_frame()) return sender_for_entry_frame(map); 479 480 intptr_t* younger_sp = sp(); 481 intptr_t* sp = sender_sp(); 482 483 // Note: The version of this operation on any platform with callee-save 484 // registers must update the register map (if not null). 485 // In order to do this correctly, the various subtypes of 486 // of frame (interpreted, compiled, glue, native), 487 // must be distinguished. There is no need on SPARC for 488 // such distinctions, because all callee-save registers are 489 // preserved for all frames via SPARC-specific mechanisms. 490 // 491 // *** HOWEVER, *** if and when we make any floating-point 492 // registers callee-saved, then we will have to copy over 493 // the RegisterMap update logic from the Intel code. 494 495 // The constructor of the sender must know whether this frame is interpreted so it can set the 496 // sender's _sp_adjustment_by_callee field. An osr adapter frame was originally 497 // interpreted but its pc is in the code cache (for c1 -> osr_frame_return_id stub), so it must be 498 // explicitly recognized. 499 500 bool frame_is_interpreted = is_interpreted_frame(); 501 if (frame_is_interpreted) { 502 map->make_integer_regs_unsaved(); 503 map->shift_window(sp, younger_sp); 504 } else if (_cb != NULL) { 505 // Update the locations of implicitly saved registers to be their 506 // addresses in the register save area. 507 // For %o registers, the addresses of %i registers in the next younger 508 // frame are used. 509 map->shift_window(sp, younger_sp); 510 if (map->update_map()) { 511 // Tell GC to use argument oopmaps for some runtime stubs that need it. 512 // For C1, the runtime stub might not have oop maps, so set this flag 513 // outside of update_register_map. 514 map->set_include_argument_oops(_cb->caller_must_gc_arguments(map->thread())); 515 if (_cb->oop_maps() != NULL) { 516 OopMapSet::update_register_map(this, map); 517 } 518 } 519 } 520 return frame(sp, younger_sp, frame_is_interpreted); 521 } 522 523 524 void frame::patch_pc(Thread* thread, address pc) { 525 if(thread == Thread::current()) { 526 StubRoutines::Sparc::flush_callers_register_windows_func()(); 527 } 528 if (TracePcPatching) { 529 // QQQ this assert is invalid (or too strong anyway) sice _pc could 530 // be original pc and frame could have the deopt pc. 531 // assert(_pc == *O7_addr() + pc_return_offset, "frame has wrong pc"); 532 tty->print_cr("patch_pc at address 0x%x [0x%x -> 0x%x] ", O7_addr(), _pc, pc); 533 } 534 _cb = CodeCache::find_blob(pc); 535 *O7_addr() = pc - pc_return_offset; 536 _cb = CodeCache::find_blob(_pc); 537 address original_pc = nmethod::get_deopt_original_pc(this); 538 if (original_pc != NULL) { 539 assert(original_pc == _pc, "expected original to be stored before patching"); 540 _deopt_state = is_deoptimized; 541 } else { 542 _deopt_state = not_deoptimized; 543 } 544 } 545 546 547 static bool sp_is_valid(intptr_t* old_sp, intptr_t* young_sp, intptr_t* sp) { 548 return (((intptr_t)sp & (2*wordSize-1)) == 0 && 549 sp <= old_sp && 550 sp >= young_sp); 551 } 552 553 554 /* 555 Find the (biased) sp that is just younger than old_sp starting at sp. 556 If not found return NULL. Register windows are assumed to be flushed. 557 */ 558 intptr_t* frame::next_younger_sp_or_null(intptr_t* old_sp, intptr_t* sp) { 559 560 intptr_t* previous_sp = NULL; 561 intptr_t* orig_sp = sp; 562 563 int max_frames = (old_sp - sp) / 16; // Minimum frame size is 16 564 int max_frame2 = max_frames; 565 while(sp != old_sp && sp_is_valid(old_sp, orig_sp, sp)) { 566 if (max_frames-- <= 0) 567 // too many frames have gone by; invalid parameters given to this function 568 break; 569 previous_sp = sp; 570 sp = (intptr_t*)sp[FP->sp_offset_in_saved_window()]; 571 sp = (intptr_t*)((intptr_t)sp + STACK_BIAS); 572 } 573 574 return (sp == old_sp ? previous_sp : NULL); 575 } 576 577 /* 578 Determine if "sp" is a valid stack pointer. "sp" is assumed to be younger than 579 "valid_sp". So if "sp" is valid itself then it should be possible to walk frames 580 from "sp" to "valid_sp". The assumption is that the registers windows for the 581 thread stack in question are flushed. 582 */ 583 bool frame::is_valid_stack_pointer(intptr_t* valid_sp, intptr_t* sp) { 584 return next_younger_sp_or_null(valid_sp, sp) != NULL; 585 } 586 587 588 bool frame::interpreter_frame_equals_unpacked_fp(intptr_t* fp) { 589 assert(is_interpreted_frame(), "must be interpreter frame"); 590 return this->fp() == fp; 591 } 592 593 594 void frame::pd_gc_epilog() { 595 if (is_interpreted_frame()) { 596 // set constant pool cache entry for interpreter 597 methodOop m = interpreter_frame_method(); 598 599 *interpreter_frame_cpoolcache_addr() = m->constants()->cache(); 600 } 601 } 602 603 604 bool frame::is_interpreted_frame_valid(JavaThread* thread) const { 605 #ifdef CC_INTERP 606 // Is there anything to do? 607 #else 608 assert(is_interpreted_frame(), "Not an interpreted frame"); 609 // These are reasonable sanity checks 610 if (fp() == 0 || (intptr_t(fp()) & (2*wordSize-1)) != 0) { 611 return false; 612 } 613 if (sp() == 0 || (intptr_t(sp()) & (2*wordSize-1)) != 0) { 614 return false; 615 } 616 617 const intptr_t interpreter_frame_initial_sp_offset = interpreter_frame_vm_local_words; 618 if (fp() + interpreter_frame_initial_sp_offset < sp()) { 619 return false; 620 } 621 // These are hacks to keep us out of trouble. 622 // The problem with these is that they mask other problems 623 if (fp() <= sp()) { // this attempts to deal with unsigned comparison above 624 return false; 625 } 626 // do some validation of frame elements 627 628 // first the method 629 630 methodOop m = *interpreter_frame_method_addr(); 631 632 // validate the method we'd find in this potential sender 633 if (!Universe::heap()->is_valid_method(m)) return false; 634 635 // stack frames shouldn't be much larger than max_stack elements 636 637 if (fp() - sp() > 1024 + m->max_stack()*Interpreter::stackElementSize) { 638 return false; 639 } 640 641 // validate bci/bcx 642 643 intptr_t bcx = interpreter_frame_bcx(); 644 if (m->validate_bci_from_bcx(bcx) < 0) { 645 return false; 646 } 647 648 // validate constantPoolCacheOop 649 650 constantPoolCacheOop cp = *interpreter_frame_cache_addr(); 651 652 if (cp == NULL || 653 !Space::is_aligned(cp) || 654 !Universe::heap()->is_permanent((void*)cp)) return false; 655 656 // validate locals 657 658 address locals = (address) *interpreter_frame_locals_addr(); 659 660 if (locals > thread->stack_base() || locals < (address) fp()) return false; 661 662 // We'd have to be pretty unlucky to be mislead at this point 663 #endif /* CC_INTERP */ 664 return true; 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 methodOop 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 #ifdef CC_INTERP 722 interpreterState istate = get_interpreterState(); 723 intptr_t* l_scratch = (intptr_t*) &istate->_native_lresult; 724 intptr_t* d_scratch = (intptr_t*) &istate->_native_fresult; 725 #else /* CC_INTERP */ 726 intptr_t* l_scratch = fp() + interpreter_frame_l_scratch_fp_offset; 727 intptr_t* d_scratch = fp() + interpreter_frame_d_scratch_fp_offset; 728 #endif /* CC_INTERP */ 729 730 address l_addr = (address)l_scratch; 731 #ifdef _LP64 732 // On 64-bit the result for 1/8/16/32-bit result types is in the other 733 // word half 734 l_addr += wordSize/2; 735 #endif 736 737 switch (type) { 738 case T_OBJECT: 739 case T_ARRAY: { 740 #ifdef CC_INTERP 741 *oop_result = istate->_oop_temp; 742 #else 743 oop obj = (oop) at(interpreter_frame_oop_temp_offset); 744 assert(obj == NULL || Universe::heap()->is_in(obj), "sanity check"); 745 *oop_result = obj; 746 #endif // CC_INTERP 747 break; 748 } 749 750 case T_BOOLEAN : { jint* p = (jint*)l_addr; value_result->z = (jboolean)((*p) & 0x1); break; } 751 case T_BYTE : { jint* p = (jint*)l_addr; value_result->b = (jbyte)((*p) & 0xff); break; } 752 case T_CHAR : { jint* p = (jint*)l_addr; value_result->c = (jchar)((*p) & 0xffff); break; } 753 case T_SHORT : { jint* p = (jint*)l_addr; value_result->s = (jshort)((*p) & 0xffff); break; } 754 case T_INT : value_result->i = *(jint*)l_addr; break; 755 case T_LONG : value_result->j = *(jlong*)l_scratch; break; 756 case T_FLOAT : value_result->f = *(jfloat*)d_scratch; break; 757 case T_DOUBLE : value_result->d = *(jdouble*)d_scratch; break; 758 case T_VOID : /* Nothing to do */ break; 759 default : ShouldNotReachHere(); 760 } 761 } else { 762 intptr_t* tos_addr = interpreter_frame_tos_address(); 763 764 switch(type) { 765 case T_OBJECT: 766 case T_ARRAY: { 767 oop obj = (oop)*tos_addr; 768 assert(obj == NULL || Universe::heap()->is_in(obj), "sanity check"); 769 *oop_result = obj; 770 break; 771 } 772 case T_BOOLEAN : { jint* p = (jint*)tos_addr; value_result->z = (jboolean)((*p) & 0x1); break; } 773 case T_BYTE : { jint* p = (jint*)tos_addr; value_result->b = (jbyte)((*p) & 0xff); break; } 774 case T_CHAR : { jint* p = (jint*)tos_addr; value_result->c = (jchar)((*p) & 0xffff); break; } 775 case T_SHORT : { jint* p = (jint*)tos_addr; value_result->s = (jshort)((*p) & 0xffff); break; } 776 case T_INT : value_result->i = *(jint*)tos_addr; break; 777 case T_LONG : value_result->j = *(jlong*)tos_addr; break; 778 case T_FLOAT : value_result->f = *(jfloat*)tos_addr; break; 779 case T_DOUBLE : value_result->d = *(jdouble*)tos_addr; break; 780 case T_VOID : /* Nothing to do */ break; 781 default : ShouldNotReachHere(); 782 } 783 }; 784 785 return type; 786 } 787 788 // Lesp pointer is one word lower than the top item on the stack. 789 intptr_t* frame::interpreter_frame_tos_at(jint offset) const { 790 int index = (Interpreter::expr_offset_in_bytes(offset)/wordSize) - 1; 791 return &interpreter_frame_tos_address()[index]; 792 }