1 /*
2 * Copyright (c) 1997, 2024, 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 if (is_heap_frame()) {
60 return true;
61 }
62 address sp = (address)_sp;
63 address fp = (address)_fp;
64 address unextended_sp = (address)_unextended_sp;
65
66 // consider stack guards when trying to determine "safe" stack pointers
67 // sp must be within the usable part of the stack (not in guards)
68 if (!thread->is_in_usable_stack(sp)) {
69 return false;
70 }
71
72 // When we are running interpreted code the machine stack pointer, SP, is
73 // set low enough so that the Java expression stack can grow and shrink
74 // without ever exceeding the machine stack bounds. So, ESP >= SP.
75
76 // When we call out of an interpreted method, SP is incremented so that
77 // the space between SP and ESP is removed. The SP saved in the callee's
78 // frame is the SP *before* this increment. So, when we walk a stack of
79 // interpreter frames the sender's SP saved in a frame might be less than
80 // the SP at the point of call.
81
82 // So unextended sp must be within the stack but we need not to check
83 // that unextended sp >= sp
84 if (!thread->is_in_full_stack_checked(unextended_sp)) {
85 return false;
86 }
87
88 // an fp must be within the stack and above (but not equal) sp
89 // second evaluation on fp+ is added to handle situation where fp is -1
90 bool fp_safe = thread->is_in_stack_range_excl(fp, sp) &&
91 thread->is_in_full_stack_checked(fp + (return_addr_offset * sizeof(void*)));
92
93 // We know sp/unextended_sp are safe only fp is questionable here
94
95 // If the current frame is known to the code cache then we can attempt to
96 // to construct the sender and do some validation of it. This goes a long way
97 // toward eliminating issues when we get in frame construction code
98
99 if (_cb != nullptr ) {
100
101 // First check if frame is complete and tester is reliable
102 // Unfortunately we can only check frame complete for runtime stubs and nmethod
103 // other generic buffer blobs are more problematic so we just assume they are
104 // ok. adapter blobs never have a frame complete and are never ok.
105
106 if (!_cb->is_frame_complete_at(_pc)) {
107 if (_cb->is_nmethod() || _cb->is_adapter_blob() || _cb->is_runtime_stub()) {
108 return false;
109 }
110 }
111
112 // Could just be some random pointer within the codeBlob
113 if (!_cb->code_contains(_pc)) {
114 return false;
115 }
116
117 // Entry frame checks
118 if (is_entry_frame()) {
119 // an entry frame must have a valid fp.
120 return fp_safe && is_entry_frame_valid(thread);
121 } else if (is_upcall_stub_frame()) {
122 return fp_safe;
123 }
124
125 intptr_t* sender_sp = nullptr;
126 intptr_t* sender_unextended_sp = nullptr;
127 address sender_pc = nullptr;
128 intptr_t* saved_fp = nullptr;
129
130 if (is_interpreted_frame()) {
131 // fp must be safe
132 if (!fp_safe) {
133 return false;
134 }
135
136 // for interpreted frames, the value below is the sender "raw" sp,
137 // which can be different from the sender unextended sp (the sp seen
138 // by the sender) because of current frame local variables
139 sender_sp = (intptr_t*) addr_at(sender_sp_offset);
140 sender_unextended_sp = (intptr_t*) this->fp()[interpreter_frame_sender_sp_offset];
141 saved_fp = (intptr_t*) this->fp()[link_offset];
142 sender_pc = pauth_strip_verifiable((address) this->fp()[return_addr_offset]);
143 } else {
144 // must be some sort of compiled/runtime frame
145 // fp does not have to be safe (although it could be check for c1?)
146
147 // check for a valid frame_size, otherwise we are unlikely to get a valid sender_pc
148 if (_cb->frame_size() <= 0) {
149 return false;
150 }
151
152 sender_sp = _unextended_sp + _cb->frame_size();
153 // Is sender_sp safe?
154 if (!thread->is_in_full_stack_checked((address)sender_sp)) {
155 return false;
156 }
157 sender_unextended_sp = sender_sp;
158 // Note: frame::sender_sp_offset is only valid for compiled frame
159 saved_fp = (intptr_t*) *(sender_sp - frame::sender_sp_offset);
160 // Note: PAC authentication may fail in case broken frame is passed in.
161 // Just strip it for now.
162 sender_pc = pauth_strip_pointer((address) *(sender_sp - 1));
163 }
164
165 if (Continuation::is_return_barrier_entry(sender_pc)) {
166 // If our sender_pc is the return barrier, then our "real" sender is the continuation entry
167 frame s = Continuation::continuation_bottom_sender(thread, *this, sender_sp);
168 sender_sp = s.sp();
169 sender_pc = s.pc();
170 }
171
172 // If the potential sender is the interpreter then we can do some more checking
173 if (Interpreter::contains(sender_pc)) {
174
175 // fp is always saved in a recognizable place in any code we generate. However
176 // only if the sender is interpreted/call_stub (c1 too?) are we certain that the saved fp
177 // is really a frame pointer.
178
179 if (!thread->is_in_stack_range_excl((address)saved_fp, (address)sender_sp)) {
180 return false;
181 }
182
183 // construct the potential sender
184
185 frame sender(sender_sp, sender_unextended_sp, saved_fp, sender_pc);
186
187 return sender.is_interpreted_frame_valid(thread);
188
189 }
190
191 // We must always be able to find a recognizable pc
192 CodeBlob* sender_blob = CodeCache::find_blob(sender_pc);
193 if (sender_pc == nullptr || sender_blob == nullptr) {
194 return false;
195 }
196
197 // Could just be some random pointer within the codeBlob
198 if (!sender_blob->code_contains(sender_pc)) {
199 return false;
200 }
201
202 // We should never be able to see an adapter if the current frame is something from code cache
203 if (sender_blob->is_adapter_blob()) {
204 return false;
205 }
206
207 // Could be the call_stub
208 if (StubRoutines::returns_to_call_stub(sender_pc)) {
209 if (!thread->is_in_stack_range_excl((address)saved_fp, (address)sender_sp)) {
210 return false;
211 }
212
213 // construct the potential sender
214
215 frame sender(sender_sp, sender_unextended_sp, saved_fp, sender_pc);
216
217 // Validate the JavaCallWrapper an entry frame must have
218 address jcw = (address)sender.entry_frame_call_wrapper();
219
220 return thread->is_in_stack_range_excl(jcw, (address)sender.fp());
221 } else if (sender_blob->is_upcall_stub()) {
222 return false;
223 }
224
225 nmethod* nm = sender_blob->as_nmethod_or_null();
226 if (nm != nullptr) {
227 if (nm->is_deopt_mh_entry(sender_pc) || nm->is_deopt_entry(sender_pc) ||
228 nm->method()->is_method_handle_intrinsic()) {
229 return false;
230 }
231 }
232
233 // If the frame size is 0 something (or less) is bad because every nmethod has a non-zero frame size
234 // because the return address counts against the callee's frame.
235
236 if (sender_blob->frame_size() <= 0) {
237 assert(!sender_blob->is_nmethod(), "should count return address at least");
238 return false;
239 }
240
241 // We should never be able to see anything here except an nmethod. If something in the
242 // code cache (current frame) is called by an entity within the code cache that entity
243 // should not be anything but the call stub (already covered), the interpreter (already covered)
244 // or an nmethod.
245
246 if (!sender_blob->is_nmethod()) {
247 return false;
248 }
249
250 // Could put some more validation for the potential non-interpreted sender
251 // frame we'd create by calling sender if I could think of any. Wait for next crash in forte...
252
253 // One idea is seeing if the sender_pc we have is one that we'd expect to call to current cb
254
255 // We've validated the potential sender that would be created
256 return true;
257 }
258
259 // Must be native-compiled frame. Since sender will try and use fp to find
260 // linkages it must be safe
261
262 if (!fp_safe) {
263 return false;
264 }
265
266 // Will the pc we fetch be non-zero (which we'll find at the oldest frame)
267
268 if ( (address) this->fp()[return_addr_offset] == nullptr) return false;
269
270
271 // could try and do some more potential verification of native frame if we could think of some...
272
273 return true;
274
275 }
276
277 void frame::patch_pc(Thread* thread, address pc) {
278 assert(_cb == CodeCache::find_blob(pc), "unexpected pc");
279 address* pc_addr = &(((address*) sp())[-1]);
280 address signed_pc = pauth_sign_return_address(pc);
281 address pc_old = pauth_strip_verifiable(*pc_addr);
282
283 if (TracePcPatching) {
284 tty->print("patch_pc at address " INTPTR_FORMAT " [" INTPTR_FORMAT " -> " INTPTR_FORMAT "]",
285 p2i(pc_addr), p2i(pc_old), p2i(pc));
286 if (VM_Version::use_rop_protection()) {
287 tty->print(" [signed " INTPTR_FORMAT " -> " INTPTR_FORMAT "]", p2i(*pc_addr), p2i(signed_pc));
288 }
289 tty->print_cr("");
290 }
291
292 assert(!Continuation::is_return_barrier_entry(pc_old), "return barrier");
293
294 // Either the return address is the original one or we are going to
295 // patch in the same address that's already there.
296 assert(_pc == pc_old || pc == pc_old || pc_old == nullptr, "");
297 DEBUG_ONLY(address old_pc = _pc;)
298 *pc_addr = signed_pc;
299 _pc = pc; // must be set before call to get_deopt_original_pc
300 address original_pc = get_deopt_original_pc();
301 if (original_pc != nullptr) {
302 assert(original_pc == old_pc, "expected original PC to be stored before patching");
303 _deopt_state = is_deoptimized;
304 _pc = original_pc;
305 } else {
306 _deopt_state = not_deoptimized;
307 }
308 }
309
310 intptr_t* frame::entry_frame_argument_at(int offset) const {
311 // convert offset to index to deal with tsi
312 int index = (Interpreter::expr_offset_in_bytes(offset)/wordSize);
313 // Entry frame's arguments are always in relation to unextended_sp()
314 return &unextended_sp()[index];
315 }
316
317 // locals
318
319 void frame::interpreter_frame_set_locals(intptr_t* locs) {
320 assert(is_interpreted_frame(), "interpreted frame expected");
321 // set relativized locals
322 ptr_at_put(interpreter_frame_locals_offset, (intptr_t) (locs - fp()));
323 }
324
325 // sender_sp
326
327 intptr_t* frame::interpreter_frame_sender_sp() const {
328 assert(is_interpreted_frame(), "interpreted frame expected");
329 return (intptr_t*) at(interpreter_frame_sender_sp_offset);
330 }
331
332 void frame::set_interpreter_frame_sender_sp(intptr_t* sender_sp) {
333 assert(is_interpreted_frame(), "interpreted frame expected");
334 ptr_at_put(interpreter_frame_sender_sp_offset, (intptr_t) sender_sp);
335 }
336
337
338 // monitor elements
339
340 BasicObjectLock* frame::interpreter_frame_monitor_begin() const {
341 return (BasicObjectLock*) addr_at(interpreter_frame_monitor_block_bottom_offset);
342 }
343
344 BasicObjectLock* frame::interpreter_frame_monitor_end() const {
345 BasicObjectLock* result = (BasicObjectLock*) at_relative(interpreter_frame_monitor_block_top_offset);
346 // make sure the pointer points inside the frame
347 assert(sp() <= (intptr_t*) result, "monitor end should be above the stack pointer");
348 assert((intptr_t*) result < fp(), "monitor end should be strictly below the frame pointer");
349 return result;
350 }
351
352 void frame::interpreter_frame_set_monitor_end(BasicObjectLock* value) {
353 assert(is_interpreted_frame(), "interpreted frame expected");
354 // set relativized monitor_block_top
355 ptr_at_put(interpreter_frame_monitor_block_top_offset, (intptr_t*)value - fp());
356 assert(at_absolute(interpreter_frame_monitor_block_top_offset) <= interpreter_frame_monitor_block_top_offset, "");
357 }
358
359 // Used by template based interpreter deoptimization
360 void frame::interpreter_frame_set_last_sp(intptr_t* sp) {
361 assert(is_interpreted_frame(), "interpreted frame expected");
362 // set relativized last_sp
363 ptr_at_put(interpreter_frame_last_sp_offset, sp != nullptr ? (sp - fp()) : 0);
364 }
365
366 // Used by template based interpreter deoptimization
367 void frame::interpreter_frame_set_extended_sp(intptr_t* sp) {
368 assert(is_interpreted_frame(), "interpreted frame expected");
369 // set relativized extended_sp
370 ptr_at_put(interpreter_frame_extended_sp_offset, (sp - fp()));
371 }
372
373 frame frame::sender_for_entry_frame(RegisterMap* map) const {
374 assert(map != nullptr, "map must be set");
375 // Java frame called from C; skip all C frames and return top C
376 // frame of that chunk as the sender
377 JavaFrameAnchor* jfa = entry_frame_call_wrapper()->anchor();
378 assert(!entry_frame_is_first(), "next Java fp must be non zero");
379 assert(jfa->last_Java_sp() > sp(), "must be above this frame on stack");
380 // Since we are walking the stack now this nested anchor is obviously walkable
381 // even if it wasn't when it was stacked.
382 jfa->make_walkable();
383 map->clear();
384 assert(map->include_argument_oops(), "should be set by clear");
385 frame fr(jfa->last_Java_sp(), jfa->last_Java_fp(), jfa->last_Java_pc());
386 fr.set_sp_is_trusted();
387
388 return fr;
389 }
390
391 UpcallStub::FrameData* UpcallStub::frame_data_for_frame(const frame& frame) const {
392 assert(frame.is_upcall_stub_frame(), "wrong frame");
393 // need unextended_sp here, since normal sp is wrong for interpreter callees
394 return reinterpret_cast<UpcallStub::FrameData*>(
395 reinterpret_cast<address>(frame.unextended_sp()) + in_bytes(_frame_data_offset));
396 }
397
398 bool frame::upcall_stub_frame_is_first() const {
399 assert(is_upcall_stub_frame(), "must be optimzed entry frame");
400 UpcallStub* blob = _cb->as_upcall_stub();
401 JavaFrameAnchor* jfa = blob->jfa_for_frame(*this);
402 return jfa->last_Java_sp() == nullptr;
403 }
404
405 frame frame::sender_for_upcall_stub_frame(RegisterMap* map) const {
406 assert(map != nullptr, "map must be set");
407 UpcallStub* blob = _cb->as_upcall_stub();
408 // Java frame called from C; skip all C frames and return top C
409 // frame of that chunk as the sender
410 JavaFrameAnchor* jfa = blob->jfa_for_frame(*this);
411 assert(!upcall_stub_frame_is_first(), "must have a frame anchor to go back to");
412 assert(jfa->last_Java_sp() > sp(), "must be above this frame on stack");
413 // Since we are walking the stack now this nested anchor is obviously walkable
414 // even if it wasn't when it was stacked.
415 jfa->make_walkable();
416 map->clear();
417 assert(map->include_argument_oops(), "should be set by clear");
418 frame fr(jfa->last_Java_sp(), jfa->last_Java_fp(), jfa->last_Java_pc());
419
420 return fr;
421 }
422
423 #if defined(ASSERT)
424 static address get_register_address_in_stub(const frame& stub_fr, VMReg reg) {
425 RegisterMap map(nullptr,
426 RegisterMap::UpdateMap::include,
427 RegisterMap::ProcessFrames::skip,
428 RegisterMap::WalkContinuation::skip);
429 stub_fr.oop_map()->update_register_map(&stub_fr, &map);
430 return map.location(reg, stub_fr.sp());
431 }
432 #endif
433
434 JavaThread** frame::saved_thread_address(const frame& f) {
435 CodeBlob* cb = f.cb();
436 assert(cb != nullptr && cb->is_runtime_stub(), "invalid frame");
437
438 JavaThread** thread_addr;
439 #ifdef COMPILER1
440 if (cb == Runtime1::blob_for(C1StubId::monitorenter_id) ||
441 cb == Runtime1::blob_for(C1StubId::monitorenter_nofpu_id)) {
442 thread_addr = (JavaThread**)(f.sp() + Runtime1::runtime_blob_current_thread_offset(f));
443 } else
444 #endif
445 {
446 // c2 only saves rbp in the stub frame so nothing to do.
447 thread_addr = nullptr;
448 }
449 assert(get_register_address_in_stub(f, SharedRuntime::thread_register()) == (address)thread_addr, "wrong thread address");
450 return thread_addr;
451 }
452
453 //------------------------------------------------------------------------------
454 // frame::verify_deopt_original_pc
455 //
456 // Verifies the calculated original PC of a deoptimization PC for the
457 // given unextended SP.
458 #ifdef ASSERT
459 void frame::verify_deopt_original_pc(nmethod* nm, intptr_t* unextended_sp) {
460 frame fr;
461
462 // This is ugly but it's better than to change {get,set}_original_pc
463 // to take an SP value as argument. And it's only a debugging
464 // method anyway.
465 fr._unextended_sp = unextended_sp;
466
467 address original_pc = nm->get_original_pc(&fr);
468 assert(nm->insts_contains_inclusive(original_pc),
469 "original PC must be in the main code section of the compiled method (or must be immediately following it)");
470 }
471 #endif
472
473 //------------------------------------------------------------------------------
474 // frame::adjust_unextended_sp
475 #ifdef ASSERT
476 void frame::adjust_unextended_sp() {
477 // On aarch64, sites calling method handle intrinsics and lambda forms are treated
478 // as any other call site. Therefore, no special action is needed when we are
479 // returning to any of these call sites.
480
481 if (_cb != nullptr) {
482 nmethod* sender_nm = _cb->as_nmethod_or_null();
483 if (sender_nm != nullptr) {
484 // If the sender PC is a deoptimization point, get the original PC.
485 if (sender_nm->is_deopt_entry(_pc) ||
486 sender_nm->is_deopt_mh_entry(_pc)) {
487 verify_deopt_original_pc(sender_nm, _unextended_sp);
488 }
489 }
490 }
491 }
492 #endif
493
494
495 //------------------------------------------------------------------------------
496 // frame::sender_for_interpreter_frame
497 frame frame::sender_for_interpreter_frame(RegisterMap* map) const {
498 // SP is the raw SP from the sender after adapter or interpreter
499 // extension.
500 intptr_t* sender_sp = this->sender_sp();
501
502 // This is the sp before any possible extension (adapter/locals).
503 intptr_t* unextended_sp = interpreter_frame_sender_sp();
504 intptr_t* sender_fp = link();
505
506 #if COMPILER2_OR_JVMCI
507 if (map->update_map()) {
508 update_map_with_saved_link(map, (intptr_t**) addr_at(link_offset));
509 }
510 #endif // COMPILER2_OR_JVMCI
511
512 // For ROP protection, Interpreter will have signed the sender_pc,
513 // but there is no requirement to authenticate it here.
514 address sender_pc = pauth_strip_verifiable(sender_pc_maybe_signed());
515
516 if (Continuation::is_return_barrier_entry(sender_pc)) {
517 if (map->walk_cont()) { // about to walk into an h-stack
518 return Continuation::top_frame(*this, map);
519 } else {
520 return Continuation::continuation_bottom_sender(map->thread(), *this, sender_sp);
521 }
522 }
523
524 return frame(sender_sp, unextended_sp, sender_fp, sender_pc);
525 }
526
527 bool frame::is_interpreted_frame_valid(JavaThread* thread) const {
528 assert(is_interpreted_frame(), "Not an interpreted frame");
529 // These are reasonable sanity checks
530 if (fp() == nullptr || (intptr_t(fp()) & (wordSize-1)) != 0) {
531 return false;
532 }
533 if (sp() == nullptr || (intptr_t(sp()) & (wordSize-1)) != 0) {
534 return false;
535 }
536 if (fp() + interpreter_frame_initial_sp_offset < sp()) {
537 return false;
538 }
539 // These are hacks to keep us out of trouble.
540 // The problem with these is that they mask other problems
541 if (fp() <= sp()) { // this attempts to deal with unsigned comparison above
542 return false;
543 }
544
545 // do some validation of frame elements
546
547 // first the method
548
549 Method* m = safe_interpreter_frame_method();
550
551 // validate the method we'd find in this potential sender
552 if (!Method::is_valid_method(m)) return false;
553
554 // stack frames shouldn't be much larger than max_stack elements
555 // this test requires the use of unextended_sp which is the sp as seen by
556 // the current frame, and not sp which is the "raw" pc which could point
557 // further because of local variables of the callee method inserted after
558 // method arguments
559 if (fp() - unextended_sp() > 1024 + m->max_stack()*Interpreter::stackElementSize) {
560 return false;
561 }
562
563 // validate bci/bcx
564
565 address bcp = interpreter_frame_bcp();
566 if (m->validate_bci_from_bcp(bcp) < 0) {
567 return false;
568 }
569
570 // validate constantPoolCache*
571 ConstantPoolCache* cp = *interpreter_frame_cache_addr();
572 if (MetaspaceObj::is_valid(cp) == false) return false;
573
574 // validate locals
575
576 address locals = (address)interpreter_frame_locals();
577 return thread->is_in_stack_range_incl(locals, (address)fp());
578 }
579
580 BasicType frame::interpreter_frame_result(oop* oop_result, jvalue* value_result) {
581 assert(is_interpreted_frame(), "interpreted frame expected");
582 Method* method = interpreter_frame_method();
583 BasicType type = method->result_type();
584
585 intptr_t* tos_addr;
586 if (method->is_native()) {
587 // TODO : ensure AARCH64 does the same as Intel here i.e. push v0 then r0
588 // Prior to calling into the runtime to report the method_exit the possible
589 // return value is pushed to the native stack. If the result is a jfloat/jdouble
590 // then ST0 is saved before EAX/EDX. See the note in generate_native_result
591 tos_addr = (intptr_t*)sp();
592 if (type == T_FLOAT || type == T_DOUBLE) {
593 // This is times two because we do a push(ltos) after pushing XMM0
594 // and that takes two interpreter stack slots.
595 tos_addr += 2 * Interpreter::stackElementWords;
596 }
597 } else {
598 tos_addr = (intptr_t*)interpreter_frame_tos_address();
599 }
600
601 switch (type) {
602 case T_OBJECT :
603 case T_ARRAY : {
604 oop obj;
605 if (method->is_native()) {
606 obj = cast_to_oop(at(interpreter_frame_oop_temp_offset));
607 } else {
608 oop* obj_p = (oop*)tos_addr;
609 obj = (obj_p == nullptr) ? (oop)nullptr : *obj_p;
610 }
611 assert(Universe::is_in_heap_or_null(obj), "sanity check");
612 *oop_result = obj;
613 break;
614 }
615 case T_BOOLEAN : value_result->z = *(jboolean*)tos_addr; break;
616 case T_BYTE : value_result->b = *(jbyte*)tos_addr; break;
617 case T_CHAR : value_result->c = *(jchar*)tos_addr; break;
618 case T_SHORT : value_result->s = *(jshort*)tos_addr; break;
619 case T_INT : value_result->i = *(jint*)tos_addr; break;
620 case T_LONG : value_result->j = *(jlong*)tos_addr; break;
621 case T_FLOAT : {
622 value_result->f = *(jfloat*)tos_addr;
623 break;
624 }
625 case T_DOUBLE : value_result->d = *(jdouble*)tos_addr; break;
626 case T_VOID : /* Nothing to do */ break;
627 default : ShouldNotReachHere();
628 }
629
630 return type;
631 }
632
633 intptr_t* frame::interpreter_frame_tos_at(jint offset) const {
634 int index = (Interpreter::expr_offset_in_bytes(offset)/wordSize);
635 return &interpreter_frame_tos_address()[index];
636 }
637
638 #ifndef PRODUCT
639
640 #define DESCRIBE_FP_OFFSET(name) \
641 values.describe(frame_no, fp() + frame::name##_offset, #name)
642
643 void frame::describe_pd(FrameValues& values, int frame_no) {
644 if (is_interpreted_frame()) {
645 DESCRIBE_FP_OFFSET(interpreter_frame_sender_sp);
646 DESCRIBE_FP_OFFSET(interpreter_frame_last_sp);
647 DESCRIBE_FP_OFFSET(interpreter_frame_method);
648 DESCRIBE_FP_OFFSET(interpreter_frame_mdp);
649 DESCRIBE_FP_OFFSET(interpreter_frame_extended_sp);
650 DESCRIBE_FP_OFFSET(interpreter_frame_mirror);
651 DESCRIBE_FP_OFFSET(interpreter_frame_cache);
652 DESCRIBE_FP_OFFSET(interpreter_frame_locals);
653 DESCRIBE_FP_OFFSET(interpreter_frame_bcp);
654 DESCRIBE_FP_OFFSET(interpreter_frame_initial_sp);
655 }
656
657 if (is_java_frame() || Continuation::is_continuation_enterSpecial(*this)) {
658 intptr_t* ret_pc_loc;
659 intptr_t* fp_loc;
660 if (is_interpreted_frame()) {
661 ret_pc_loc = fp() + return_addr_offset;
662 fp_loc = fp();
663 } else {
664 ret_pc_loc = real_fp() - return_addr_offset;
665 fp_loc = real_fp() - sender_sp_offset;
666 }
667 address ret_pc = *(address*)ret_pc_loc;
668 values.describe(frame_no, ret_pc_loc,
669 Continuation::is_return_barrier_entry(ret_pc) ? "return address (return barrier)" : "return address");
670 values.describe(-1, fp_loc, "saved fp", 0); // "unowned" as value belongs to sender
671 }
672 }
673 #endif
674
675 intptr_t *frame::initial_deoptimization_info() {
676 // Not used on aarch64, but we must return something.
677 return nullptr;
678 }
679
680 #undef DESCRIBE_FP_OFFSET
681
682 #define DESCRIBE_FP_OFFSET(name) \
683 { \
684 uintptr_t *p = (uintptr_t *)fp; \
685 printf(INTPTR_FORMAT " " INTPTR_FORMAT " %s\n", \
686 (uintptr_t)(p + frame::name##_offset), \
687 p[frame::name##_offset], #name); \
688 }
689
690 static THREAD_LOCAL uintptr_t nextfp;
691 static THREAD_LOCAL uintptr_t nextpc;
692 static THREAD_LOCAL uintptr_t nextsp;
693 static THREAD_LOCAL RegisterMap *reg_map;
694
695 static void printbc(Method *m, intptr_t bcx) {
696 const char *name;
697 char buf[16];
698 if (m->validate_bci_from_bcp((address)bcx) < 0
699 || !m->contains((address)bcx)) {
700 name = "???";
701 snprintf(buf, sizeof buf, "(bad)");
702 } else {
703 int bci = m->bci_from((address)bcx);
704 snprintf(buf, sizeof buf, "%d", bci);
705 name = Bytecodes::name(m->code_at(bci));
706 }
707 ResourceMark rm;
708 printf("%s : %s ==> %s\n", m->name_and_sig_as_C_string(), buf, name);
709 }
710
711 static void internal_pf(uintptr_t sp, uintptr_t fp, uintptr_t pc, uintptr_t bcx) {
712 if (! fp)
713 return;
714
715 DESCRIBE_FP_OFFSET(return_addr);
716 DESCRIBE_FP_OFFSET(link);
717 DESCRIBE_FP_OFFSET(interpreter_frame_sender_sp);
718 DESCRIBE_FP_OFFSET(interpreter_frame_last_sp);
719 DESCRIBE_FP_OFFSET(interpreter_frame_method);
720 DESCRIBE_FP_OFFSET(interpreter_frame_mdp);
721 DESCRIBE_FP_OFFSET(interpreter_frame_extended_sp);
722 DESCRIBE_FP_OFFSET(interpreter_frame_mirror);
723 DESCRIBE_FP_OFFSET(interpreter_frame_cache);
724 DESCRIBE_FP_OFFSET(interpreter_frame_locals);
725 DESCRIBE_FP_OFFSET(interpreter_frame_bcp);
726 DESCRIBE_FP_OFFSET(interpreter_frame_initial_sp);
727 uintptr_t *p = (uintptr_t *)fp;
728
729 // We want to see all frames, native and Java. For compiled and
730 // interpreted frames we have special information that allows us to
731 // unwind them; for everything else we assume that the native frame
732 // pointer chain is intact.
733 frame this_frame((intptr_t*)sp, (intptr_t*)fp, (address)pc);
734 if (this_frame.is_compiled_frame() ||
735 this_frame.is_interpreted_frame()) {
736 frame sender = this_frame.sender(reg_map);
737 nextfp = (uintptr_t)sender.fp();
738 nextpc = (uintptr_t)sender.pc();
739 nextsp = (uintptr_t)sender.unextended_sp();
740 } else {
741 nextfp = p[frame::link_offset];
742 nextpc = p[frame::return_addr_offset];
743 nextsp = (uintptr_t)&p[frame::sender_sp_offset];
744 }
745
746 if (bcx == -1ULL)
747 bcx = p[frame::interpreter_frame_bcp_offset];
748
749 if (Interpreter::contains((address)pc)) {
750 Method* m = (Method*)p[frame::interpreter_frame_method_offset];
751 if(m && m->is_method()) {
752 printbc(m, bcx);
753 } else
754 printf("not a Method\n");
755 } else {
756 CodeBlob *cb = CodeCache::find_blob((address)pc);
757 if (cb != nullptr) {
758 if (cb->is_nmethod()) {
759 ResourceMark rm;
760 nmethod* nm = (nmethod*)cb;
761 printf("nmethod %s\n", nm->method()->name_and_sig_as_C_string());
762 } else if (cb->name()) {
763 printf("CodeBlob %s\n", cb->name());
764 }
765 }
766 }
767 }
768
769 extern "C" void npf() {
770 CodeBlob *cb = CodeCache::find_blob((address)nextpc);
771 // C2 does not always chain the frame pointers when it can, instead
772 // preferring to use fixed offsets from SP, so a simple leave() does
773 // not work. Instead, it adds the frame size to SP then pops FP and
774 // LR. We have to do the same thing to get a good call chain.
775 if (cb && cb->frame_size())
776 nextfp = nextsp + wordSize * (cb->frame_size() - 2);
777 internal_pf (nextsp, nextfp, nextpc, -1);
778 }
779
780 extern "C" void pf(uintptr_t sp, uintptr_t fp, uintptr_t pc,
781 uintptr_t bcx, uintptr_t thread) {
782 if (!reg_map) {
783 reg_map = NEW_C_HEAP_OBJ(RegisterMap, mtInternal);
784 ::new (reg_map) RegisterMap(reinterpret_cast<JavaThread*>(thread),
785 RegisterMap::UpdateMap::skip,
786 RegisterMap::ProcessFrames::include,
787 RegisterMap::WalkContinuation::skip);
788 } else {
789 *reg_map = RegisterMap(reinterpret_cast<JavaThread*>(thread),
790 RegisterMap::UpdateMap::skip,
791 RegisterMap::ProcessFrames::include,
792 RegisterMap::WalkContinuation::skip);
793 }
794
795 {
796 CodeBlob *cb = CodeCache::find_blob((address)pc);
797 if (cb && cb->frame_size())
798 fp = sp + wordSize * (cb->frame_size() - 2);
799 }
800 internal_pf(sp, fp, pc, bcx);
801 }
802
803 // support for printing out where we are in a Java method
804 // needs to be passed current fp and bcp register values
805 // prints method name, bc index and bytecode name
806 extern "C" void pm(uintptr_t fp, uintptr_t bcx) {
807 DESCRIBE_FP_OFFSET(interpreter_frame_method);
808 uintptr_t *p = (uintptr_t *)fp;
809 Method* m = (Method*)p[frame::interpreter_frame_method_offset];
810 printbc(m, bcx);
811 }
812
813 #ifndef PRODUCT
814 // This is a generic constructor which is only used by pns() in debug.cpp.
815 frame::frame(void* sp, void* fp, void* pc) {
816 init((intptr_t*)sp, (intptr_t*)fp, (address)pc);
817 }
818
819 #endif
820
821 void JavaFrameAnchor::make_walkable() {
822 // last frame set?
823 if (last_Java_sp() == nullptr) return;
824 // already walkable?
825 if (walkable()) return;
826 vmassert(last_Java_sp() != nullptr, "not called from Java code?");
827 vmassert(last_Java_pc() == nullptr, "already walkable");
828 _last_Java_pc = (address)_last_Java_sp[-1];
829 vmassert(walkable(), "something went wrong");
830 }