1 /*
2 * Copyright 1997-2010 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any 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()->instructions_contains(sender_pc)) return false;
257
258 // We should never be able to see an adapter if the current frame is something from code cache
259
260 if ( sender_blob->is_adapter_blob()) {
261 return false;
262 }
263
264 if( sender.is_entry_frame()) {
265 // Validate the JavaCallWrapper an entry frame must have
266
267 address jcw = (address)sender.entry_frame_call_wrapper();
268
269 bool jcw_safe = (jcw <= thread->stack_base()) && ( jcw > sender_fp);
270
271 return jcw_safe;
272 }
273
274 // If the frame size is 0 something is bad because every nmethod has a non-zero frame size
275 // because you must allocate window space
276
277 if (sender_blob->frame_size() == 0) {
278 assert(!sender_blob->is_nmethod(), "should count return address at least");
279 return false;
280 }
281
282 // The sender should positively be an nmethod or call_stub. On sparc we might in fact see something else.
283 // The cause of this is because at a save instruction the O7 we get is a leftover from an earlier
284 // window use. So if a runtime stub creates two frames (common in fastdebug/jvmg) then we see the
285 // stale pc. So if the sender blob is not something we'd expect we have little choice but to declare
286 // the stack unwalkable. pd_get_top_frame_for_signal_handler tries to recover from this by unwinding
287 // that initial frame and retrying.
288
289 if (!sender_blob->is_nmethod()) {
290 return false;
291 }
292
293 // Could put some more validation for the potential non-interpreted sender
294 // frame we'd create by calling sender if I could think of any. Wait for next crash in forte...
295
296 // One idea is seeing if the sender_pc we have is one that we'd expect to call to current cb
297
298 // We've validated the potential sender that would be created
299
300 return true;
301
302 }
303
304 // Must be native-compiled frame. Since sender will try and use fp to find
305 // linkages it must be safe
306
307 if (!fp_safe) return false;
308
309 // could try and do some more potential verification of native frame if we could think of some...
310
311 return true;
312 }
313
314 // constructors
315
316 // Construct an unpatchable, deficient frame
317 frame::frame(intptr_t* sp, unpatchable_t, address pc, CodeBlob* cb) {
318 #ifdef _LP64
319 assert( (((intptr_t)sp & (wordSize-1)) == 0), "frame constructor passed an invalid sp");
320 #endif
321 _sp = sp;
322 _younger_sp = NULL;
323 _pc = pc;
324 _cb = cb;
325 _sp_adjustment_by_callee = 0;
326 assert(pc == NULL && cb == NULL || pc != NULL, "can't have a cb and no pc!");
327 if (_cb == NULL && _pc != NULL ) {
328 _cb = CodeCache::find_blob(_pc);
329 }
330 _deopt_state = unknown;
331 #ifdef ASSERT
332 if ( _cb != NULL && _cb->is_nmethod()) {
333 // Without a valid unextended_sp() we can't convert the pc to "original"
334 assert(!((nmethod*)_cb)->is_deopt_pc(_pc), "invariant broken");
335 }
336 #endif // ASSERT
337 }
338
339 frame::frame(intptr_t* sp, intptr_t* younger_sp, bool younger_frame_adjusted_stack) {
340 _sp = sp;
341 _younger_sp = younger_sp;
342 if (younger_sp == NULL) {
343 // make a deficient frame which doesn't know where its PC is
344 _pc = NULL;
345 _cb = NULL;
346 } else {
347 _pc = (address)younger_sp[I7->sp_offset_in_saved_window()] + pc_return_offset;
348 assert( (intptr_t*)younger_sp[FP->sp_offset_in_saved_window()] == (intptr_t*)((intptr_t)sp - STACK_BIAS), "younger_sp must be valid");
349 // Any frame we ever build should always "safe" therefore we should not have to call
350 // find_blob_unsafe
351 // In case of native stubs, the pc retrieved here might be
352 // wrong. (the _last_native_pc will have the right value)
353 // So do not put add any asserts on the _pc here.
354 }
355 if (younger_frame_adjusted_stack) {
356 // compute adjustment to this frame's SP made by its interpreted callee
357 _sp_adjustment_by_callee = (intptr_t*)((intptr_t)younger_sp[I5_savedSP->sp_offset_in_saved_window()] +
358 STACK_BIAS) - sp;
359 } else {
360 _sp_adjustment_by_callee = 0;
361 }
362
363 _deopt_state = unknown;
364
365 // It is important that frame be fully construct when we do this lookup
366 // as get_original_pc() needs correct value for unextended_sp()
367 if (_pc != NULL) {
368 _cb = CodeCache::find_blob(_pc);
369 address original_pc = nmethod::get_deopt_original_pc(this);
370 if (original_pc != NULL) {
371 _pc = original_pc;
372 _deopt_state = is_deoptimized;
373 } else {
374 _deopt_state = not_deoptimized;
375 }
376 }
377 }
378
379 bool frame::is_interpreted_frame() const {
380 return Interpreter::contains(pc());
381 }
382
383 // sender_sp
384
385 intptr_t* frame::interpreter_frame_sender_sp() const {
386 assert(is_interpreted_frame(), "interpreted frame expected");
387 return fp();
388 }
389
390 #ifndef CC_INTERP
391 void frame::set_interpreter_frame_sender_sp(intptr_t* sender_sp) {
392 assert(is_interpreted_frame(), "interpreted frame expected");
393 Unimplemented();
394 }
395 #endif // CC_INTERP
396
397
398 #ifdef ASSERT
399 // Debugging aid
400 static frame nth_sender(int n) {
401 frame f = JavaThread::current()->last_frame();
402
403 for(int i = 0; i < n; ++i)
404 f = f.sender((RegisterMap*)NULL);
405
406 printf("first frame %d\n", f.is_first_frame() ? 1 : 0);
407 printf("interpreted frame %d\n", f.is_interpreted_frame() ? 1 : 0);
408 printf("java frame %d\n", f.is_java_frame() ? 1 : 0);
409 printf("entry frame %d\n", f.is_entry_frame() ? 1 : 0);
410 printf("native frame %d\n", f.is_native_frame() ? 1 : 0);
411 if (f.is_compiled_frame()) {
412 if (f.is_deoptimized_frame())
413 printf("deoptimized frame 1\n");
414 else
415 printf("compiled frame 1\n");
416 }
417
418 return f;
419 }
420 #endif
421
422
423 frame frame::sender_for_entry_frame(RegisterMap *map) const {
424 assert(map != NULL, "map must be set");
425 // Java frame called from C; skip all C frames and return top C
426 // frame of that chunk as the sender
427 JavaFrameAnchor* jfa = entry_frame_call_wrapper()->anchor();
428 assert(!entry_frame_is_first(), "next Java fp must be non zero");
429 assert(jfa->last_Java_sp() > _sp, "must be above this frame on stack");
430 intptr_t* last_Java_sp = jfa->last_Java_sp();
431 // Since we are walking the stack now this nested anchor is obviously walkable
432 // even if it wasn't when it was stacked.
433 if (!jfa->walkable()) {
434 // Capture _last_Java_pc (if needed) and mark anchor walkable.
435 jfa->capture_last_Java_pc(_sp);
436 }
437 assert(jfa->last_Java_pc() != NULL, "No captured pc!");
438 map->clear();
439 map->make_integer_regs_unsaved();
440 map->shift_window(last_Java_sp, NULL);
441 assert(map->include_argument_oops(), "should be set by clear");
442 return frame(last_Java_sp, frame::unpatchable, jfa->last_Java_pc());
443 }
444
445 frame frame::sender_for_interpreter_frame(RegisterMap *map) const {
446 ShouldNotCallThis();
447 return sender(map);
448 }
449
450 frame frame::sender_for_compiled_frame(RegisterMap *map) const {
451 ShouldNotCallThis();
452 return sender(map);
453 }
454
455 frame frame::sender(RegisterMap* map) const {
456 assert(map != NULL, "map must be set");
457
458 assert(CodeCache::find_blob_unsafe(_pc) == _cb, "inconsistent");
459
460 // Default is not to follow arguments; update it accordingly below
461 map->set_include_argument_oops(false);
462
463 if (is_entry_frame()) return sender_for_entry_frame(map);
464
465 intptr_t* younger_sp = sp();
466 intptr_t* sp = sender_sp();
467 bool adjusted_stack = false;
468
469 // Note: The version of this operation on any platform with callee-save
470 // registers must update the register map (if not null).
471 // In order to do this correctly, the various subtypes of
472 // of frame (interpreted, compiled, glue, native),
473 // must be distinguished. There is no need on SPARC for
474 // such distinctions, because all callee-save registers are
475 // preserved for all frames via SPARC-specific mechanisms.
476 //
477 // *** HOWEVER, *** if and when we make any floating-point
478 // registers callee-saved, then we will have to copy over
479 // the RegisterMap update logic from the Intel code.
480
481 // The constructor of the sender must know whether this frame is interpreted so it can set the
482 // sender's _sp_adjustment_by_callee field. An osr adapter frame was originally
483 // interpreted but its pc is in the code cache (for c1 -> osr_frame_return_id stub), so it must be
484 // explicitly recognized.
485
486 adjusted_stack = is_interpreted_frame();
487 if (adjusted_stack) {
488 map->make_integer_regs_unsaved();
489 map->shift_window(sp, younger_sp);
490 } else if (_cb != NULL) {
491 // Update the locations of implicitly saved registers to be their
492 // addresses in the register save area.
493 // For %o registers, the addresses of %i registers in the next younger
494 // frame are used.
495 map->shift_window(sp, younger_sp);
496 if (map->update_map()) {
497 // Tell GC to use argument oopmaps for some runtime stubs that need it.
498 // For C1, the runtime stub might not have oop maps, so set this flag
499 // outside of update_register_map.
500 map->set_include_argument_oops(_cb->caller_must_gc_arguments(map->thread()));
501 if (_cb->oop_maps() != NULL) {
502 OopMapSet::update_register_map(this, map);
503 }
504 }
505 }
506 return frame(sp, younger_sp, adjusted_stack);
507 }
508
509
510 void frame::patch_pc(Thread* thread, address pc) {
511 if(thread == Thread::current()) {
512 StubRoutines::Sparc::flush_callers_register_windows_func()();
513 }
514 if (TracePcPatching) {
515 // QQQ this assert is invalid (or too strong anyway) sice _pc could
516 // be original pc and frame could have the deopt pc.
517 // assert(_pc == *O7_addr() + pc_return_offset, "frame has wrong pc");
518 tty->print_cr("patch_pc at address 0x%x [0x%x -> 0x%x] ", O7_addr(), _pc, pc);
519 }
520 _cb = CodeCache::find_blob(pc);
521 *O7_addr() = pc - pc_return_offset;
522 _cb = CodeCache::find_blob(_pc);
523 address original_pc = nmethod::get_deopt_original_pc(this);
524 if (original_pc != NULL) {
525 assert(original_pc == _pc, "expected original to be stored before patching");
526 _deopt_state = is_deoptimized;
527 } else {
528 _deopt_state = not_deoptimized;
529 }
530 }
531
532
533 static bool sp_is_valid(intptr_t* old_sp, intptr_t* young_sp, intptr_t* sp) {
534 return (((intptr_t)sp & (2*wordSize-1)) == 0 &&
535 sp <= old_sp &&
536 sp >= young_sp);
537 }
538
539
540 /*
541 Find the (biased) sp that is just younger than old_sp starting at sp.
542 If not found return NULL. Register windows are assumed to be flushed.
543 */
544 intptr_t* frame::next_younger_sp_or_null(intptr_t* old_sp, intptr_t* sp) {
545
546 intptr_t* previous_sp = NULL;
547 intptr_t* orig_sp = sp;
548
549 int max_frames = (old_sp - sp) / 16; // Minimum frame size is 16
550 int max_frame2 = max_frames;
551 while(sp != old_sp && sp_is_valid(old_sp, orig_sp, sp)) {
552 if (max_frames-- <= 0)
553 // too many frames have gone by; invalid parameters given to this function
554 break;
555 previous_sp = sp;
556 sp = (intptr_t*)sp[FP->sp_offset_in_saved_window()];
557 sp = (intptr_t*)((intptr_t)sp + STACK_BIAS);
558 }
559
560 return (sp == old_sp ? previous_sp : NULL);
561 }
562
563 /*
564 Determine if "sp" is a valid stack pointer. "sp" is assumed to be younger than
565 "valid_sp". So if "sp" is valid itself then it should be possible to walk frames
566 from "sp" to "valid_sp". The assumption is that the registers windows for the
567 thread stack in question are flushed.
568 */
569 bool frame::is_valid_stack_pointer(intptr_t* valid_sp, intptr_t* sp) {
570 return next_younger_sp_or_null(valid_sp, sp) != NULL;
571 }
572
573
574 bool frame::interpreter_frame_equals_unpacked_fp(intptr_t* fp) {
575 assert(is_interpreted_frame(), "must be interpreter frame");
576 return this->fp() == fp;
577 }
578
579
580 void frame::pd_gc_epilog() {
581 if (is_interpreted_frame()) {
582 // set constant pool cache entry for interpreter
583 methodOop m = interpreter_frame_method();
584
585 *interpreter_frame_cpoolcache_addr() = m->constants()->cache();
586 }
587 }
588
589
590 bool frame::is_interpreted_frame_valid(JavaThread* thread) const {
591 #ifdef CC_INTERP
592 // Is there anything to do?
593 #else
594 assert(is_interpreted_frame(), "Not an interpreted frame");
595 // These are reasonable sanity checks
596 if (fp() == 0 || (intptr_t(fp()) & (2*wordSize-1)) != 0) {
597 return false;
598 }
599 if (sp() == 0 || (intptr_t(sp()) & (2*wordSize-1)) != 0) {
600 return false;
601 }
602
603 const intptr_t interpreter_frame_initial_sp_offset = interpreter_frame_vm_local_words;
604 if (fp() + interpreter_frame_initial_sp_offset < sp()) {
605 return false;
606 }
607 // These are hacks to keep us out of trouble.
608 // The problem with these is that they mask other problems
609 if (fp() <= sp()) { // this attempts to deal with unsigned comparison above
610 return false;
611 }
612 // do some validation of frame elements
613
614 // first the method
615
616 methodOop m = *interpreter_frame_method_addr();
617
618 // validate the method we'd find in this potential sender
619 if (!Universe::heap()->is_valid_method(m)) return false;
620
621 // stack frames shouldn't be much larger than max_stack elements
622
623 if (fp() - sp() > 1024 + m->max_stack()*Interpreter::stackElementSize()) {
624 return false;
625 }
626
627 // validate bci/bcx
628
629 intptr_t bcx = interpreter_frame_bcx();
630 if (m->validate_bci_from_bcx(bcx) < 0) {
631 return false;
632 }
633
634 // validate constantPoolCacheOop
635
636 constantPoolCacheOop cp = *interpreter_frame_cache_addr();
637
638 if (cp == NULL ||
639 !Space::is_aligned(cp) ||
640 !Universe::heap()->is_permanent((void*)cp)) return false;
641
642 // validate locals
643
644 address locals = (address) *interpreter_frame_locals_addr();
645
646 if (locals > thread->stack_base() || locals < (address) fp()) return false;
647
648 // We'd have to be pretty unlucky to be mislead at this point
649 #endif /* CC_INTERP */
650 return true;
651 }
652
653
654 // Windows have been flushed on entry (but not marked). Capture the pc that
655 // is the return address to the frame that contains "sp" as its stack pointer.
656 // This pc resides in the called of the frame corresponding to "sp".
657 // As a side effect we mark this JavaFrameAnchor as having flushed the windows.
658 // This side effect lets us mark stacked JavaFrameAnchors (stacked in the
659 // call_helper) as flushed when we have flushed the windows for the most
660 // recent (i.e. current) JavaFrameAnchor. This saves useless flushing calls
661 // and lets us find the pc just once rather than multiple times as it did
662 // in the bad old _post_Java_state days.
663 //
664 void JavaFrameAnchor::capture_last_Java_pc(intptr_t* sp) {
665 if (last_Java_sp() != NULL && last_Java_pc() == NULL) {
666 // try and find the sp just younger than _last_Java_sp
667 intptr_t* _post_Java_sp = frame::next_younger_sp_or_null(last_Java_sp(), sp);
668 // Really this should never fail otherwise VM call must have non-standard
669 // frame linkage (bad) or stack is not properly flushed (worse).
670 guarantee(_post_Java_sp != NULL, "bad stack!");
671 _last_Java_pc = (address) _post_Java_sp[ I7->sp_offset_in_saved_window()] + frame::pc_return_offset;
672
673 }
674 set_window_flushed();
675 }
676
677 void JavaFrameAnchor::make_walkable(JavaThread* thread) {
678 if (walkable()) return;
679 // Eventually make an assert
680 guarantee(Thread::current() == (Thread*)thread, "only current thread can flush its registers");
681 // We always flush in case the profiler wants it but we won't mark
682 // the windows as flushed unless we have a last_Java_frame
683 intptr_t* sp = StubRoutines::Sparc::flush_callers_register_windows_func()();
684 if (last_Java_sp() != NULL ) {
685 capture_last_Java_pc(sp);
686 }
687 }
688
689 intptr_t* frame::entry_frame_argument_at(int offset) const {
690 // convert offset to index to deal with tsi
691 int index = (Interpreter::expr_offset_in_bytes(offset)/wordSize);
692
693 intptr_t* LSP = (intptr_t*) sp()[Lentry_args->sp_offset_in_saved_window()];
694 return &LSP[index+1];
695 }
696
697
698 BasicType frame::interpreter_frame_result(oop* oop_result, jvalue* value_result) {
699 assert(is_interpreted_frame(), "interpreted frame expected");
700 methodOop method = interpreter_frame_method();
701 BasicType type = method->result_type();
702
703 if (method->is_native()) {
704 // Prior to notifying the runtime of the method_exit the possible result
705 // value is saved to l_scratch and d_scratch.
706
707 #ifdef CC_INTERP
708 interpreterState istate = get_interpreterState();
709 intptr_t* l_scratch = (intptr_t*) &istate->_native_lresult;
710 intptr_t* d_scratch = (intptr_t*) &istate->_native_fresult;
711 #else /* CC_INTERP */
712 intptr_t* l_scratch = fp() + interpreter_frame_l_scratch_fp_offset;
713 intptr_t* d_scratch = fp() + interpreter_frame_d_scratch_fp_offset;
714 #endif /* CC_INTERP */
715
716 address l_addr = (address)l_scratch;
717 #ifdef _LP64
718 // On 64-bit the result for 1/8/16/32-bit result types is in the other
719 // word half
720 l_addr += wordSize/2;
721 #endif
722
723 switch (type) {
724 case T_OBJECT:
725 case T_ARRAY: {
726 #ifdef CC_INTERP
727 *oop_result = istate->_oop_temp;
728 #else
729 oop obj = (oop) at(interpreter_frame_oop_temp_offset);
730 assert(obj == NULL || Universe::heap()->is_in(obj), "sanity check");
731 *oop_result = obj;
732 #endif // CC_INTERP
733 break;
734 }
735
736 case T_BOOLEAN : { jint* p = (jint*)l_addr; value_result->z = (jboolean)((*p) & 0x1); break; }
737 case T_BYTE : { jint* p = (jint*)l_addr; value_result->b = (jbyte)((*p) & 0xff); break; }
738 case T_CHAR : { jint* p = (jint*)l_addr; value_result->c = (jchar)((*p) & 0xffff); break; }
739 case T_SHORT : { jint* p = (jint*)l_addr; value_result->s = (jshort)((*p) & 0xffff); break; }
740 case T_INT : value_result->i = *(jint*)l_addr; break;
741 case T_LONG : value_result->j = *(jlong*)l_scratch; break;
742 case T_FLOAT : value_result->f = *(jfloat*)d_scratch; break;
743 case T_DOUBLE : value_result->d = *(jdouble*)d_scratch; break;
744 case T_VOID : /* Nothing to do */ break;
745 default : ShouldNotReachHere();
746 }
747 } else {
748 intptr_t* tos_addr = interpreter_frame_tos_address();
749
750 switch(type) {
751 case T_OBJECT:
752 case T_ARRAY: {
753 oop obj = (oop)*tos_addr;
754 assert(obj == NULL || Universe::heap()->is_in(obj), "sanity check");
755 *oop_result = obj;
756 break;
757 }
758 case T_BOOLEAN : { jint* p = (jint*)tos_addr; value_result->z = (jboolean)((*p) & 0x1); break; }
759 case T_BYTE : { jint* p = (jint*)tos_addr; value_result->b = (jbyte)((*p) & 0xff); break; }
760 case T_CHAR : { jint* p = (jint*)tos_addr; value_result->c = (jchar)((*p) & 0xffff); break; }
761 case T_SHORT : { jint* p = (jint*)tos_addr; value_result->s = (jshort)((*p) & 0xffff); break; }
762 case T_INT : value_result->i = *(jint*)tos_addr; break;
763 case T_LONG : value_result->j = *(jlong*)tos_addr; break;
764 case T_FLOAT : value_result->f = *(jfloat*)tos_addr; break;
765 case T_DOUBLE : value_result->d = *(jdouble*)tos_addr; break;
766 case T_VOID : /* Nothing to do */ break;
767 default : ShouldNotReachHere();
768 }
769 };
770
771 return type;
772 }
773
774 // Lesp pointer is one word lower than the top item on the stack.
775 intptr_t* frame::interpreter_frame_tos_at(jint offset) const {
776 int index = (Interpreter::expr_offset_in_bytes(offset)/wordSize) - 1;
777 return &interpreter_frame_tos_address()[index];
778 }