1 /*
2 * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved.
3 * Copyright (c) 2012, 2017 SAP SE. 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 // no precompiled headers
27 #include "jvm.h"
28 #include "asm/assembler.inline.hpp"
29 #include "classfile/classLoader.hpp"
30 #include "classfile/systemDictionary.hpp"
31 #include "classfile/vmSymbols.hpp"
32 #include "code/codeCache.hpp"
33 #include "code/icBuffer.hpp"
34 #include "code/vtableStubs.hpp"
35 #include "interpreter/interpreter.hpp"
36 #include "memory/allocation.inline.hpp"
37 #include "nativeInst_ppc.hpp"
38 #include "os_share_aix.hpp"
39 #include "prims/jniFastGetField.hpp"
40 #include "prims/jvm_misc.hpp"
41 #include "porting_aix.hpp"
42 #include "runtime/arguments.hpp"
43 #include "runtime/extendedPC.hpp"
44 #include "runtime/frame.inline.hpp"
45 #include "runtime/interfaceSupport.hpp"
46 #include "runtime/java.hpp"
47 #include "runtime/javaCalls.hpp"
48 #include "runtime/mutexLocker.hpp"
49 #include "runtime/osThread.hpp"
50 #include "runtime/sharedRuntime.hpp"
51 #include "runtime/stubRoutines.hpp"
52 #include "runtime/thread.inline.hpp"
53 #include "runtime/timer.hpp"
54 #include "utilities/events.hpp"
55 #include "utilities/vmError.hpp"
56 #ifdef COMPILER1
57 #include "c1/c1_Runtime1.hpp"
58 #endif
59 #ifdef COMPILER2
60 #include "opto/runtime.hpp"
61 #endif
62
63 // put OS-includes here
64 # include <ucontext.h>
65
66 address os::current_stack_pointer() {
67 address csp;
68
69 #if !defined(USE_XLC_BUILTINS)
70 // inline assembly for `mr regno(csp), R1_SP':
71 __asm__ __volatile__ ("mr %0, 1":"=r"(csp):);
72 #else
73 csp = (address) __builtin_frame_address(0);
74 #endif
75
76 return csp;
77 }
78
79 char* os::non_memory_address_word() {
80 // Must never look like an address returned by reserve_memory,
81 // even in its subfields (as defined by the CPU immediate fields,
82 // if the CPU splits constants across multiple instructions).
83
84 return (char*) -1;
85 }
86
87 // OS specific thread initialization
88 //
89 // Calculate and store the limits of the memory stack.
90 void os::initialize_thread(Thread *thread) { }
91
92 // Frame information (pc, sp, fp) retrieved via ucontext
93 // always looks like a C-frame according to the frame
94 // conventions in frame_ppc.hpp.
95
96 address os::Aix::ucontext_get_pc(const ucontext_t * uc) {
97 return (address)uc->uc_mcontext.jmp_context.iar;
98 }
99
100 intptr_t* os::Aix::ucontext_get_sp(const ucontext_t * uc) {
101 // gpr1 holds the stack pointer on aix
102 return (intptr_t*)uc->uc_mcontext.jmp_context.gpr[1/*REG_SP*/];
103 }
104
105 intptr_t* os::Aix::ucontext_get_fp(const ucontext_t * uc) {
106 return NULL;
107 }
108
109 void os::Aix::ucontext_set_pc(ucontext_t* uc, address new_pc) {
110 uc->uc_mcontext.jmp_context.iar = (uint64_t) new_pc;
111 }
112
113 address ucontext_get_lr(const ucontext_t * uc) {
114 return (address)uc->uc_mcontext.jmp_context.lr;
115 }
116
117 ExtendedPC os::fetch_frame_from_context(const void* ucVoid,
118 intptr_t** ret_sp, intptr_t** ret_fp) {
119
120 ExtendedPC epc;
121 const ucontext_t* uc = (const ucontext_t*)ucVoid;
122
123 if (uc != NULL) {
124 epc = ExtendedPC(os::Aix::ucontext_get_pc(uc));
125 if (ret_sp) *ret_sp = os::Aix::ucontext_get_sp(uc);
126 if (ret_fp) *ret_fp = os::Aix::ucontext_get_fp(uc);
127 } else {
128 // construct empty ExtendedPC for return value checking
129 epc = ExtendedPC(NULL);
130 if (ret_sp) *ret_sp = (intptr_t *)NULL;
131 if (ret_fp) *ret_fp = (intptr_t *)NULL;
132 }
133
134 return epc;
135 }
136
137 frame os::fetch_frame_from_context(const void* ucVoid) {
138 intptr_t* sp;
139 intptr_t* fp;
140 ExtendedPC epc = fetch_frame_from_context(ucVoid, &sp, &fp);
141 // Avoid crash during crash if pc broken.
142 if (epc.pc()) {
143 frame fr(sp, epc.pc());
144 return fr;
145 }
146 frame fr(sp);
147 return fr;
148 }
149
150 bool os::Aix::get_frame_at_stack_banging_point(JavaThread* thread, ucontext_t* uc, frame* fr) {
151 address pc = (address) os::Aix::ucontext_get_pc(uc);
152 if (Interpreter::contains(pc)) {
153 // Interpreter performs stack banging after the fixed frame header has
154 // been generated while the compilers perform it before. To maintain
155 // semantic consistency between interpreted and compiled frames, the
156 // method returns the Java sender of the current frame.
157 *fr = os::fetch_frame_from_context(uc);
158 if (!fr->is_first_java_frame()) {
159 assert(fr->safe_for_sender(thread), "Safety check");
160 *fr = fr->java_sender();
161 }
162 } else {
163 // More complex code with compiled code.
164 assert(!Interpreter::contains(pc), "Interpreted methods should have been handled above");
165 CodeBlob* cb = CodeCache::find_blob(pc);
166 if (cb == NULL || !cb->is_nmethod() || cb->is_frame_complete_at(pc)) {
167 // Not sure where the pc points to, fallback to default
168 // stack overflow handling. In compiled code, we bang before
169 // the frame is complete.
170 return false;
171 } else {
172 intptr_t* sp = os::Aix::ucontext_get_sp(uc);
173 address lr = ucontext_get_lr(uc);
174 *fr = frame(sp, lr);
175 if (!fr->is_java_frame()) {
176 assert(fr->safe_for_sender(thread), "Safety check");
177 assert(!fr->is_first_frame(), "Safety check");
178 *fr = fr->java_sender();
179 }
180 }
181 }
182 assert(fr->is_java_frame(), "Safety check");
183 return true;
184 }
185
186 frame os::get_sender_for_C_frame(frame* fr) {
187 if (*fr->sp() == NULL) {
188 // fr is the last C frame
189 return frame(NULL, NULL);
190 }
191 return frame(fr->sender_sp(), fr->sender_pc());
192 }
193
194
195 frame os::current_frame() {
196 intptr_t* csp = (intptr_t*) *((intptr_t*) os::current_stack_pointer());
197 // hack.
198 frame topframe(csp, (address)0x8);
199 // Return sender of sender of current topframe which hopefully
200 // both have pc != NULL.
201 frame tmp = os::get_sender_for_C_frame(&topframe);
202 return os::get_sender_for_C_frame(&tmp);
203 }
204
205 // Utility functions
206
207 extern "C" JNIEXPORT int
208 JVM_handle_aix_signal(int sig, siginfo_t* info, void* ucVoid, int abort_if_unrecognized) {
209
210 ucontext_t* uc = (ucontext_t*) ucVoid;
211
212 Thread* t = Thread::current_or_null_safe();
213
214 SignalHandlerMark shm(t);
215
216 // Note: it's not uncommon that JNI code uses signal/sigset to install
217 // then restore certain signal handler (e.g. to temporarily block SIGPIPE,
218 // or have a SIGILL handler when detecting CPU type). When that happens,
219 // JVM_handle_aix_signal() might be invoked with junk info/ucVoid. To
220 // avoid unnecessary crash when libjsig is not preloaded, try handle signals
221 // that do not require siginfo/ucontext first.
222
223 if (sig == SIGPIPE) {
224 if (os::Aix::chained_handler(sig, info, ucVoid)) {
225 return 1;
226 } else {
227 // Ignoring SIGPIPE - see bugs 4229104
228 return 1;
229 }
230 }
231
232 JavaThread* thread = NULL;
233 VMThread* vmthread = NULL;
234 if (os::Aix::signal_handlers_are_installed) {
235 if (t != NULL) {
236 if(t->is_Java_thread()) {
237 thread = (JavaThread*)t;
238 }
239 else if(t->is_VM_thread()) {
240 vmthread = (VMThread *)t;
241 }
242 }
243 }
244
245 // Decide if this trap can be handled by a stub.
246 address stub = NULL;
247
248 // retrieve program counter
249 address const pc = uc ? os::Aix::ucontext_get_pc(uc) : NULL;
250
251 // retrieve crash address
252 address const addr = info ? (const address) info->si_addr : NULL;
253
254 // SafeFetch 32 handling:
255 // - make it work if _thread is null
256 // - make it use the standard os::...::ucontext_get/set_pc APIs
257 if (uc) {
258 address const pc = os::Aix::ucontext_get_pc(uc);
259 if (pc && StubRoutines::is_safefetch_fault(pc)) {
260 os::Aix::ucontext_set_pc(uc, StubRoutines::continuation_for_safefetch_fault(pc));
261 return true;
262 }
263 }
264
265 if (info == NULL || uc == NULL || thread == NULL && vmthread == NULL) {
266 goto run_chained_handler;
267 }
268
269 // If we are a java thread...
270 if (thread != NULL) {
271
272 // Handle ALL stack overflow variations here
273 if (sig == SIGSEGV && thread->on_local_stack(addr)) {
274 // stack overflow
275 //
276 // If we are in a yellow zone and we are inside java, we disable the yellow zone and
277 // throw a stack overflow exception.
278 // If we are in native code or VM C code, we report-and-die. The original coding tried
279 // to continue with yellow zone disabled, but that doesn't buy us much and prevents
280 // hs_err_pid files.
281 if (thread->in_stack_yellow_reserved_zone(addr)) {
282 if (thread->thread_state() == _thread_in_Java) {
283 if (thread->in_stack_reserved_zone(addr)) {
284 frame fr;
285 if (os::Aix::get_frame_at_stack_banging_point(thread, uc, &fr)) {
286 assert(fr.is_java_frame(), "Must be a Javac frame");
287 frame activation =
288 SharedRuntime::look_for_reserved_stack_annotated_method(thread, fr);
289 if (activation.sp() != NULL) {
290 thread->disable_stack_reserved_zone();
291 if (activation.is_interpreted_frame()) {
292 thread->set_reserved_stack_activation((address)activation.fp());
293 } else {
294 thread->set_reserved_stack_activation((address)activation.unextended_sp());
295 }
296 return 1;
297 }
298 }
299 }
300 // Throw a stack overflow exception.
301 // Guard pages will be reenabled while unwinding the stack.
302 thread->disable_stack_yellow_reserved_zone();
303 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW);
304 goto run_stub;
305 } else {
306 // Thread was in the vm or native code. Return and try to finish.
307 thread->disable_stack_yellow_reserved_zone();
308 return 1;
309 }
310 } else if (thread->in_stack_red_zone(addr)) {
311 // Fatal red zone violation. Disable the guard pages and fall through
312 // to handle_unexpected_exception way down below.
313 thread->disable_stack_red_zone();
314 tty->print_raw_cr("An irrecoverable stack overflow has occurred.");
315 goto report_and_die;
316 } else {
317 // This means a segv happened inside our stack, but not in
318 // the guarded zone. I'd like to know when this happens,
319 tty->print_raw_cr("SIGSEGV happened inside stack but outside yellow and red zone.");
320 goto report_and_die;
321 }
322
323 } // end handle SIGSEGV inside stack boundaries
324
325 if (thread->thread_state() == _thread_in_Java) {
326 // Java thread running in Java code
327
328 // The following signals are used for communicating VM events:
329 //
330 // SIGILL: the compiler generates illegal opcodes
331 // at places where it wishes to interrupt the VM:
332 // Safepoints, Unreachable Code, Entry points of Zombie methods,
333 // This results in a SIGILL with (*pc) == inserted illegal instruction.
334 //
335 // (so, SIGILLs with a pc inside the zero page are real errors)
336 //
337 // SIGTRAP:
338 // The ppc trap instruction raises a SIGTRAP and is very efficient if it
339 // does not trap. It is used for conditional branches that are expected
340 // to be never taken. These are:
341 // - zombie methods
342 // - IC (inline cache) misses.
343 // - null checks leading to UncommonTraps.
344 // - range checks leading to Uncommon Traps.
345 // On Aix, these are especially null checks, as the ImplicitNullCheck
346 // optimization works only in rare cases, as the page at address 0 is only
347 // write protected. //
348 // Note: !UseSIGTRAP is used to prevent SIGTRAPS altogether, to facilitate debugging.
349 //
350 // SIGSEGV:
351 // used for safe point polling:
352 // To notify all threads that they have to reach a safe point, safe point polling is used:
353 // All threads poll a certain mapped memory page. Normally, this page has read access.
354 // If the VM wants to inform the threads about impending safe points, it puts this
355 // page to read only ("poisens" the page), and the threads then reach a safe point.
356 // used for null checks:
357 // If the compiler finds a store it uses it for a null check. Unfortunately this
358 // happens rarely. In heap based and disjoint base compressd oop modes also loads
359 // are used for null checks.
360
361 // A VM-related SIGILL may only occur if we are not in the zero page.
362 // On AIX, we get a SIGILL if we jump to 0x0 or to somewhere else
363 // in the zero page, because it is filled with 0x0. We ignore
364 // explicit SIGILLs in the zero page.
365 if (sig == SIGILL && (pc < (address) 0x200)) {
366 if (TraceTraps) {
367 tty->print_raw_cr("SIGILL happened inside zero page.");
368 }
369 goto report_and_die;
370 }
371
372 // Handle signal from NativeJump::patch_verified_entry().
373 if (( TrapBasedNotEntrantChecks && sig == SIGTRAP && nativeInstruction_at(pc)->is_sigtrap_zombie_not_entrant()) ||
374 (!TrapBasedNotEntrantChecks && sig == SIGILL && nativeInstruction_at(pc)->is_sigill_zombie_not_entrant())) {
375 if (TraceTraps) {
376 tty->print_cr("trap: zombie_not_entrant (%s)", (sig == SIGTRAP) ? "SIGTRAP" : "SIGILL");
377 }
378 stub = SharedRuntime::get_handle_wrong_method_stub();
379 goto run_stub;
380 }
381
382 else if (sig == SIGSEGV && os::is_poll_address(addr)) {
383 if (TraceTraps) {
384 tty->print_cr("trap: safepoint_poll at " INTPTR_FORMAT " (SIGSEGV)", pc);
385 }
386 stub = SharedRuntime::get_poll_stub(pc);
387 goto run_stub;
388 }
389
390 // SIGTRAP-based ic miss check in compiled code.
391 else if (sig == SIGTRAP && TrapBasedICMissChecks &&
392 nativeInstruction_at(pc)->is_sigtrap_ic_miss_check()) {
393 if (TraceTraps) {
394 tty->print_cr("trap: ic_miss_check at " INTPTR_FORMAT " (SIGTRAP)", pc);
395 }
396 stub = SharedRuntime::get_ic_miss_stub();
397 goto run_stub;
398 }
399
400 // SIGTRAP-based implicit null check in compiled code.
401 else if (sig == SIGTRAP && TrapBasedNullChecks &&
402 nativeInstruction_at(pc)->is_sigtrap_null_check()) {
403 if (TraceTraps) {
404 tty->print_cr("trap: null_check at " INTPTR_FORMAT " (SIGTRAP)", pc);
405 }
406 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
407 goto run_stub;
408 }
409
410 // SIGSEGV-based implicit null check in compiled code.
411 else if (sig == SIGSEGV && ImplicitNullChecks &&
412 CodeCache::contains((void*) pc) &&
413 !MacroAssembler::needs_explicit_null_check((intptr_t) info->si_addr)) {
414 if (TraceTraps) {
415 tty->print_cr("trap: null_check at " INTPTR_FORMAT " (SIGSEGV)", pc);
416 }
417 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
418 }
419
420 #ifdef COMPILER2
421 // SIGTRAP-based implicit range check in compiled code.
422 else if (sig == SIGTRAP && TrapBasedRangeChecks &&
423 nativeInstruction_at(pc)->is_sigtrap_range_check()) {
424 if (TraceTraps) {
425 tty->print_cr("trap: range_check at " INTPTR_FORMAT " (SIGTRAP)", pc);
426 }
427 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
428 goto run_stub;
429 }
430 #endif
431
432 else if (sig == SIGFPE /* && info->si_code == FPE_INTDIV */) {
433 if (TraceTraps) {
434 tty->print_raw_cr("Fix SIGFPE handler, trying divide by zero handler.");
435 }
436 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO);
437 goto run_stub;
438 }
439
440 else if (sig == SIGBUS) {
441 // BugId 4454115: A read from a MappedByteBuffer can fault here if the
442 // underlying file has been truncated. Do not crash the VM in such a case.
443 CodeBlob* cb = CodeCache::find_blob_unsafe(pc);
444 CompiledMethod* nm = cb->as_compiled_method_or_null();
445 if (nm != NULL && nm->has_unsafe_access()) {
446 address next_pc = pc + 4;
447 next_pc = SharedRuntime::handle_unsafe_access(thread, next_pc);
448 os::Aix::ucontext_set_pc(uc, next_pc);
449 return 1;
450 }
451 }
452 }
453
454 else { // thread->thread_state() != _thread_in_Java
455 // Detect CPU features. This is only done at the very start of the VM. Later, the
456 // VM_Version::is_determine_features_test_running() flag should be false.
457
458 if (sig == SIGILL && VM_Version::is_determine_features_test_running()) {
459 // SIGILL must be caused by VM_Version::determine_features().
460 *(int *)pc = 0; // patch instruction to 0 to indicate that it causes a SIGILL,
461 // flushing of icache is not necessary.
462 stub = pc + 4; // continue with next instruction.
463 goto run_stub;
464 }
465 else if (thread->thread_state() == _thread_in_vm &&
466 sig == SIGBUS && thread->doing_unsafe_access()) {
467 address next_pc = pc + 4;
468 next_pc = SharedRuntime::handle_unsafe_access(thread, next_pc);
469 os::Aix::ucontext_set_pc(uc, next_pc);
470 return 1;
471 }
472 }
473
474 // Check to see if we caught the safepoint code in the
475 // process of write protecting the memory serialization page.
476 // It write enables the page immediately after protecting it
477 // so we can just return to retry the write.
478 if ((sig == SIGSEGV) &&
479 os::is_memory_serialize_page(thread, addr)) {
480 // Synchronization problem in the pseudo memory barrier code (bug id 6546278)
481 // Block current thread until the memory serialize page permission restored.
482 os::block_on_serialize_page_trap();
483 return true;
484 }
485 }
486
487 run_stub:
488
489 // One of the above code blocks ininitalized the stub, so we want to
490 // delegate control to that stub.
491 if (stub != NULL) {
492 // Save all thread context in case we need to restore it.
493 if (thread != NULL) thread->set_saved_exception_pc(pc);
494 os::Aix::ucontext_set_pc(uc, stub);
495 return 1;
496 }
497
498 run_chained_handler:
499
500 // signal-chaining
501 if (os::Aix::chained_handler(sig, info, ucVoid)) {
502 return 1;
503 }
504 if (!abort_if_unrecognized) {
505 // caller wants another chance, so give it to him
506 return 0;
507 }
508
509 report_and_die:
510
511 // Use sigthreadmask instead of sigprocmask on AIX and unmask current signal.
512 sigset_t newset;
513 sigemptyset(&newset);
514 sigaddset(&newset, sig);
515 sigthreadmask(SIG_UNBLOCK, &newset, NULL);
516
517 VMError::report_and_die(t, sig, pc, info, ucVoid);
518
519 ShouldNotReachHere();
520 return 0;
521 }
522
523 void os::Aix::init_thread_fpu_state(void) {
524 #if !defined(USE_XLC_BUILTINS)
525 // Disable FP exceptions.
526 __asm__ __volatile__ ("mtfsfi 6,0");
527 #else
528 __mtfsfi(6, 0);
529 #endif
530 }
531
532 ////////////////////////////////////////////////////////////////////////////////
533 // thread stack
534
535 // Minimum usable stack sizes required to get to user code. Space for
536 // HotSpot guard pages is added later.
537 size_t os::Posix::_compiler_thread_min_stack_allowed = 192 * K;
538 size_t os::Posix::_java_thread_min_stack_allowed = 64 * K;
539 size_t os::Posix::_vm_internal_thread_min_stack_allowed = 64 * K;
540
541 // Return default stack size for thr_type.
542 size_t os::Posix::default_stack_size(os::ThreadType thr_type) {
543 // Default stack size (compiler thread needs larger stack).
544 size_t s = (thr_type == os::compiler_thread ? 4 * M : 1 * M);
545 return s;
546 }
547
548 /////////////////////////////////////////////////////////////////////////////
549 // helper functions for fatal error handler
550
551 void os::print_context(outputStream *st, const void *context) {
552 if (context == NULL) return;
553
554 const ucontext_t* uc = (const ucontext_t*)context;
555
556 st->print_cr("Registers:");
557 st->print("pc =" INTPTR_FORMAT " ", uc->uc_mcontext.jmp_context.iar);
558 st->print("lr =" INTPTR_FORMAT " ", uc->uc_mcontext.jmp_context.lr);
559 st->print("ctr=" INTPTR_FORMAT " ", uc->uc_mcontext.jmp_context.ctr);
560 st->cr();
561 for (int i = 0; i < 32; i++) {
562 st->print("r%-2d=" INTPTR_FORMAT " ", i, uc->uc_mcontext.jmp_context.gpr[i]);
563 if (i % 3 == 2) st->cr();
564 }
565 st->cr();
566 st->cr();
567
568 intptr_t *sp = (intptr_t *)os::Aix::ucontext_get_sp(uc);
569 st->print_cr("Top of Stack: (sp=" PTR_FORMAT ")", sp);
570 print_hex_dump(st, (address)sp, (address)(sp + 128), sizeof(intptr_t));
571 st->cr();
572
573 // Note: it may be unsafe to inspect memory near pc. For example, pc may
574 // point to garbage if entry point in an nmethod is corrupted. Leave
575 // this at the end, and hope for the best.
576 address pc = os::Aix::ucontext_get_pc(uc);
577 st->print_cr("Instructions: (pc=" PTR_FORMAT ")", pc);
578 print_hex_dump(st, pc - 64, pc + 64, /*instrsize=*/4);
579 st->cr();
580
581 // Try to decode the instructions.
582 st->print_cr("Decoded instructions: (pc=" PTR_FORMAT ")", pc);
583 st->print("<TODO: PPC port - print_context>");
584 // TODO: PPC port Disassembler::decode(pc, 16, 16, st);
585 st->cr();
586 }
587
588 void os::print_register_info(outputStream *st, const void *context) {
589 if (context == NULL) return;
590
591 ucontext_t *uc = (ucontext_t*)context;
592
593 st->print_cr("Register to memory mapping:");
594 st->cr();
595
596 st->print("pc ="); print_location(st, (intptr_t)uc->uc_mcontext.jmp_context.iar);
597 st->print("lr ="); print_location(st, (intptr_t)uc->uc_mcontext.jmp_context.lr);
598 st->print("sp ="); print_location(st, (intptr_t)os::Aix::ucontext_get_sp(uc));
599 for (int i = 0; i < 32; i++) {
600 st->print("r%-2d=", i);
601 print_location(st, (intptr_t)uc->uc_mcontext.jmp_context.gpr[i]);
602 }
603
604 st->cr();
605 }
606
607 extern "C" {
608 int SpinPause() {
609 return 0;
610 }
611 }
612
613 #ifndef PRODUCT
614 void os::verify_stack_alignment() {
615 assert(((intptr_t)os::current_stack_pointer() & (StackAlignmentInBytes-1)) == 0, "incorrect stack alignment");
616 }
617 #endif
618
619 int os::extra_bang_size_in_bytes() {
620 // PPC does not require the additional stack bang.
621 return 0;
622 }
623
624 bool os::platform_print_native_stack(outputStream* st, void* context, char *buf, int buf_size) {
625 AixNativeCallstack::print_callstack_for_context(st, (const ucontext_t*)context, true, buf, (size_t) buf_size);
626 return true;
627 }
628
629