1 /*
2 * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
3 * Copyright (c) 2012, 2018 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/safepointMechanism.hpp"
51 #include "runtime/sharedRuntime.hpp"
52 #include "runtime/stubRoutines.hpp"
53 #include "runtime/thread.inline.hpp"
54 #include "runtime/timer.hpp"
55 #include "utilities/events.hpp"
56 #include "utilities/vmError.hpp"
57 #ifdef COMPILER1
58 #include "c1/c1_Runtime1.hpp"
59 #endif
60 #ifdef COMPILER2
61 #include "opto/runtime.hpp"
62 #endif
63
64 // put OS-includes here
65 # include <ucontext.h>
66
67 address os::current_stack_pointer() {
68 address csp;
69
70 #if !defined(USE_XLC_BUILTINS)
71 // inline assembly for `mr regno(csp), R1_SP':
72 __asm__ __volatile__ ("mr %0, 1":"=r"(csp):);
73 #else
74 csp = (address) __builtin_frame_address(0);
75 #endif
76
77 return csp;
78 }
79
80 char* os::non_memory_address_word() {
81 // Must never look like an address returned by reserve_memory,
82 // even in its subfields (as defined by the CPU immediate fields,
83 // if the CPU splits constants across multiple instructions).
84
85 return (char*) -1;
86 }
87
88 // OS specific thread initialization
89 //
90 // Calculate and store the limits of the memory stack.
91 void os::initialize_thread(Thread *thread) { }
92
93 // Frame information (pc, sp, fp) retrieved via ucontext
94 // always looks like a C-frame according to the frame
95 // conventions in frame_ppc.hpp.
96
97 address os::Aix::ucontext_get_pc(const ucontext_t * uc) {
98 return (address)uc->uc_mcontext.jmp_context.iar;
99 }
100
101 intptr_t* os::Aix::ucontext_get_sp(const ucontext_t * uc) {
102 // gpr1 holds the stack pointer on aix
103 return (intptr_t*)uc->uc_mcontext.jmp_context.gpr[1/*REG_SP*/];
104 }
105
106 intptr_t* os::Aix::ucontext_get_fp(const ucontext_t * uc) {
107 return NULL;
108 }
109
110 void os::Aix::ucontext_set_pc(ucontext_t* uc, address new_pc) {
111 uc->uc_mcontext.jmp_context.iar = (uint64_t) new_pc;
112 }
113
114 static address ucontext_get_lr(const ucontext_t * uc) {
115 return (address)uc->uc_mcontext.jmp_context.lr;
116 }
117
118 ExtendedPC os::fetch_frame_from_context(const void* ucVoid,
119 intptr_t** ret_sp, intptr_t** ret_fp) {
120
121 ExtendedPC epc;
122 const ucontext_t* uc = (const ucontext_t*)ucVoid;
123
124 if (uc != NULL) {
125 epc = ExtendedPC(os::Aix::ucontext_get_pc(uc));
126 if (ret_sp) *ret_sp = os::Aix::ucontext_get_sp(uc);
127 if (ret_fp) *ret_fp = os::Aix::ucontext_get_fp(uc);
128 } else {
129 // construct empty ExtendedPC for return value checking
130 epc = ExtendedPC(NULL);
131 if (ret_sp) *ret_sp = (intptr_t *)NULL;
132 if (ret_fp) *ret_fp = (intptr_t *)NULL;
133 }
134
135 return epc;
136 }
137
138 frame os::fetch_frame_from_context(const void* ucVoid) {
139 intptr_t* sp;
140 intptr_t* fp;
141 ExtendedPC epc = fetch_frame_from_context(ucVoid, &sp, &fp);
142 // Avoid crash during crash if pc broken.
143 if (epc.pc()) {
144 frame fr(sp, epc.pc());
145 return fr;
146 }
147 frame fr(sp);
148 return fr;
149 }
150
151 bool os::Aix::get_frame_at_stack_banging_point(JavaThread* thread, ucontext_t* uc, frame* fr) {
152 address pc = (address) os::Aix::ucontext_get_pc(uc);
153 if (Interpreter::contains(pc)) {
154 // Interpreter performs stack banging after the fixed frame header has
155 // been generated while the compilers perform it before. To maintain
156 // semantic consistency between interpreted and compiled frames, the
157 // method returns the Java sender of the current frame.
158 *fr = os::fetch_frame_from_context(uc);
159 if (!fr->is_first_java_frame()) {
160 assert(fr->safe_for_sender(thread), "Safety check");
161 *fr = fr->java_sender();
162 }
163 } else {
164 // More complex code with compiled code.
165 assert(!Interpreter::contains(pc), "Interpreted methods should have been handled above");
166 CodeBlob* cb = CodeCache::find_blob(pc);
167 if (cb == NULL || !cb->is_nmethod() || cb->is_frame_complete_at(pc)) {
168 // Not sure where the pc points to, fallback to default
169 // stack overflow handling. In compiled code, we bang before
170 // the frame is complete.
171 return false;
172 } else {
173 intptr_t* sp = os::Aix::ucontext_get_sp(uc);
174 address lr = ucontext_get_lr(uc);
175 *fr = frame(sp, lr);
176 if (!fr->is_java_frame()) {
177 assert(fr->safe_for_sender(thread), "Safety check");
178 assert(!fr->is_first_frame(), "Safety check");
179 *fr = fr->java_sender();
180 }
181 }
182 }
183 assert(fr->is_java_frame(), "Safety check");
184 return true;
185 }
186
187 frame os::get_sender_for_C_frame(frame* fr) {
188 if (*fr->sp() == NULL) {
189 // fr is the last C frame
190 return frame(NULL, NULL);
191 }
192 return frame(fr->sender_sp(), fr->sender_pc());
193 }
194
195
196 frame os::current_frame() {
197 intptr_t* csp = (intptr_t*) *((intptr_t*) os::current_stack_pointer());
198 // hack.
199 frame topframe(csp, (address)0x8);
200 // Return sender of sender of current topframe which hopefully
201 // both have pc != NULL.
202 frame tmp = os::get_sender_for_C_frame(&topframe);
203 return os::get_sender_for_C_frame(&tmp);
204 }
205
206 // Utility functions
207
208 extern "C" JNIEXPORT int
209 JVM_handle_aix_signal(int sig, siginfo_t* info, void* ucVoid, int abort_if_unrecognized) {
210
211 ucontext_t* uc = (ucontext_t*) ucVoid;
212
213 Thread* t = Thread::current_or_null_safe();
214
215 SignalHandlerMark shm(t);
216
217 // Note: it's not uncommon that JNI code uses signal/sigset to install
218 // then restore certain signal handler (e.g. to temporarily block SIGPIPE,
219 // or have a SIGILL handler when detecting CPU type). When that happens,
220 // JVM_handle_aix_signal() might be invoked with junk info/ucVoid. To
221 // avoid unnecessary crash when libjsig is not preloaded, try handle signals
222 // that do not require siginfo/ucontext first.
223
224 if (sig == SIGPIPE) {
225 if (os::Aix::chained_handler(sig, info, ucVoid)) {
226 return 1;
227 } else {
228 // Ignoring SIGPIPE - see bugs 4229104
229 return 1;
230 }
231 }
232
233 JavaThread* thread = NULL;
234 VMThread* vmthread = NULL;
235 if (os::Aix::signal_handlers_are_installed) {
236 if (t != NULL) {
237 if(t->is_Java_thread()) {
238 thread = (JavaThread*)t;
239 }
240 else if(t->is_VM_thread()) {
241 vmthread = (VMThread *)t;
242 }
243 }
244 }
245
246 // Decide if this trap can be handled by a stub.
247 address stub = NULL;
248
249 // retrieve program counter
250 address const pc = uc ? os::Aix::ucontext_get_pc(uc) : NULL;
251
252 // retrieve crash address
253 address const addr = info ? (const address) info->si_addr : NULL;
254
255 // SafeFetch 32 handling:
256 // - make it work if _thread is null
257 // - make it use the standard os::...::ucontext_get/set_pc APIs
258 if (uc) {
259 address const pc = os::Aix::ucontext_get_pc(uc);
260 if (pc && StubRoutines::is_safefetch_fault(pc)) {
261 os::Aix::ucontext_set_pc(uc, StubRoutines::continuation_for_safefetch_fault(pc));
262 return true;
263 }
264 }
265
266 if (info == NULL || uc == NULL || thread == NULL && vmthread == NULL) {
267 goto run_chained_handler;
268 }
269
270 // If we are a java thread...
271 if (thread != NULL) {
272
273 // Handle ALL stack overflow variations here
274 if (sig == SIGSEGV && thread->on_local_stack(addr)) {
275 // stack overflow
276 //
277 // If we are in a yellow zone and we are inside java, we disable the yellow zone and
278 // throw a stack overflow exception.
279 // If we are in native code or VM C code, we report-and-die. The original coding tried
280 // to continue with yellow zone disabled, but that doesn't buy us much and prevents
281 // hs_err_pid files.
282 if (thread->in_stack_yellow_reserved_zone(addr)) {
283 if (thread->thread_state() == _thread_in_Java) {
284 if (thread->in_stack_reserved_zone(addr)) {
285 frame fr;
286 if (os::Aix::get_frame_at_stack_banging_point(thread, uc, &fr)) {
287 assert(fr.is_java_frame(), "Must be a Javac frame");
288 frame activation =
289 SharedRuntime::look_for_reserved_stack_annotated_method(thread, fr);
290 if (activation.sp() != NULL) {
291 thread->disable_stack_reserved_zone();
292 if (activation.is_interpreted_frame()) {
293 thread->set_reserved_stack_activation((address)activation.fp());
294 } else {
295 thread->set_reserved_stack_activation((address)activation.unextended_sp());
296 }
297 return 1;
298 }
299 }
300 }
301 // Throw a stack overflow exception.
302 // Guard pages will be reenabled while unwinding the stack.
303 thread->disable_stack_yellow_reserved_zone();
304 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW);
305 goto run_stub;
306 } else {
307 // Thread was in the vm or native code. Return and try to finish.
308 thread->disable_stack_yellow_reserved_zone();
309 return 1;
310 }
311 } else if (thread->in_stack_red_zone(addr)) {
312 // Fatal red zone violation. Disable the guard pages and fall through
313 // to handle_unexpected_exception way down below.
314 thread->disable_stack_red_zone();
315 tty->print_raw_cr("An irrecoverable stack overflow has occurred.");
316 goto report_and_die;
317 } else {
318 // This means a segv happened inside our stack, but not in
319 // the guarded zone. I'd like to know when this happens,
320 tty->print_raw_cr("SIGSEGV happened inside stack but outside yellow and red zone.");
321 goto report_and_die;
322 }
323
324 } // end handle SIGSEGV inside stack boundaries
325
326 if (thread->thread_state() == _thread_in_Java) {
327 // Java thread running in Java code
328
329 // The following signals are used for communicating VM events:
330 //
331 // SIGILL: the compiler generates illegal opcodes
332 // at places where it wishes to interrupt the VM:
333 // Safepoints, Unreachable Code, Entry points of Zombie methods,
334 // This results in a SIGILL with (*pc) == inserted illegal instruction.
335 //
336 // (so, SIGILLs with a pc inside the zero page are real errors)
337 //
338 // SIGTRAP:
339 // The ppc trap instruction raises a SIGTRAP and is very efficient if it
340 // does not trap. It is used for conditional branches that are expected
341 // to be never taken. These are:
342 // - zombie methods
343 // - IC (inline cache) misses.
344 // - null checks leading to UncommonTraps.
345 // - range checks leading to Uncommon Traps.
346 // On Aix, these are especially null checks, as the ImplicitNullCheck
347 // optimization works only in rare cases, as the page at address 0 is only
348 // write protected. //
349 // Note: !UseSIGTRAP is used to prevent SIGTRAPS altogether, to facilitate debugging.
350 //
351 // SIGSEGV:
352 // used for safe point polling:
353 // To notify all threads that they have to reach a safe point, safe point polling is used:
354 // All threads poll a certain mapped memory page. Normally, this page has read access.
355 // If the VM wants to inform the threads about impending safe points, it puts this
356 // page to read only ("poisens" the page), and the threads then reach a safe point.
357 // used for null checks:
358 // If the compiler finds a store it uses it for a null check. Unfortunately this
359 // happens rarely. In heap based and disjoint base compressd oop modes also loads
360 // are used for null checks.
361
362 // A VM-related SIGILL may only occur if we are not in the zero page.
363 // On AIX, we get a SIGILL if we jump to 0x0 or to somewhere else
364 // in the zero page, because it is filled with 0x0. We ignore
365 // explicit SIGILLs in the zero page.
366 if (sig == SIGILL && (pc < (address) 0x200)) {
367 if (TraceTraps) {
368 tty->print_raw_cr("SIGILL happened inside zero page.");
369 }
370 goto report_and_die;
371 }
372
373 // Handle signal from NativeJump::patch_verified_entry().
374 if (( TrapBasedNotEntrantChecks && sig == SIGTRAP && nativeInstruction_at(pc)->is_sigtrap_zombie_not_entrant()) ||
375 (!TrapBasedNotEntrantChecks && sig == SIGILL && nativeInstruction_at(pc)->is_sigill_zombie_not_entrant())) {
376 if (TraceTraps) {
377 tty->print_cr("trap: zombie_not_entrant (%s)", (sig == SIGTRAP) ? "SIGTRAP" : "SIGILL");
378 }
379 stub = SharedRuntime::get_handle_wrong_method_stub();
380 goto run_stub;
381 }
382
383 else if ((SafepointMechanism::uses_thread_local_poll() && USE_POLL_BIT_ONLY)
384 ? (sig == SIGTRAP && ((NativeInstruction*)pc)->is_safepoint_poll())
385 : (sig == SIGSEGV && os::is_poll_address(addr))) {
386 if (TraceTraps) {
387 tty->print_cr("trap: safepoint_poll at " INTPTR_FORMAT " (%s)", p2i(pc),
388 (SafepointMechanism::uses_thread_local_poll() && USE_POLL_BIT_ONLY) ? "SIGTRAP" : "SIGSEGV");
389 }
390 stub = SharedRuntime::get_poll_stub(pc);
391 goto run_stub;
392 }
393
394 // SIGTRAP-based ic miss check in compiled code.
395 else if (sig == SIGTRAP && TrapBasedICMissChecks &&
396 nativeInstruction_at(pc)->is_sigtrap_ic_miss_check()) {
397 if (TraceTraps) {
398 tty->print_cr("trap: ic_miss_check at " INTPTR_FORMAT " (SIGTRAP)", pc);
399 }
400 stub = SharedRuntime::get_ic_miss_stub();
401 goto run_stub;
402 }
403
404 // SIGTRAP-based implicit null check in compiled code.
405 else if (sig == SIGTRAP && TrapBasedNullChecks &&
406 nativeInstruction_at(pc)->is_sigtrap_null_check()) {
407 if (TraceTraps) {
408 tty->print_cr("trap: null_check at " INTPTR_FORMAT " (SIGTRAP)", pc);
409 }
410 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
411 goto run_stub;
412 }
413
414 // SIGSEGV-based implicit null check in compiled code.
415 else if (sig == SIGSEGV && ImplicitNullChecks &&
416 CodeCache::contains((void*) pc) &&
417 !MacroAssembler::needs_explicit_null_check((intptr_t) info->si_addr)) {
418 if (TraceTraps) {
419 tty->print_cr("trap: null_check at " INTPTR_FORMAT " (SIGSEGV)", pc);
420 }
421 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
422 }
423
424 #ifdef COMPILER2
425 // SIGTRAP-based implicit range check in compiled code.
426 else if (sig == SIGTRAP && TrapBasedRangeChecks &&
427 nativeInstruction_at(pc)->is_sigtrap_range_check()) {
428 if (TraceTraps) {
429 tty->print_cr("trap: range_check at " INTPTR_FORMAT " (SIGTRAP)", pc);
430 }
431 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
432 goto run_stub;
433 }
434 #endif
435
436 else if (sig == SIGFPE /* && info->si_code == FPE_INTDIV */) {
437 if (TraceTraps) {
438 tty->print_raw_cr("Fix SIGFPE handler, trying divide by zero handler.");
439 }
440 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO);
441 goto run_stub;
442 }
443
444 else if (sig == SIGBUS) {
445 // BugId 4454115: A read from a MappedByteBuffer can fault here if the
446 // underlying file has been truncated. Do not crash the VM in such a case.
447 CodeBlob* cb = CodeCache::find_blob_unsafe(pc);
448 CompiledMethod* nm = cb->as_compiled_method_or_null();
449 if (nm != NULL && nm->has_unsafe_access()) {
450 address next_pc = pc + 4;
451 next_pc = SharedRuntime::handle_unsafe_access(thread, next_pc);
452 os::Aix::ucontext_set_pc(uc, next_pc);
453 return 1;
454 }
455 }
456 }
457
458 else { // thread->thread_state() != _thread_in_Java
459 // Detect CPU features. This is only done at the very start of the VM. Later, the
460 // VM_Version::is_determine_features_test_running() flag should be false.
461
462 if (sig == SIGILL && VM_Version::is_determine_features_test_running()) {
463 // SIGILL must be caused by VM_Version::determine_features().
464 *(int *)pc = 0; // patch instruction to 0 to indicate that it causes a SIGILL,
465 // flushing of icache is not necessary.
466 stub = pc + 4; // continue with next instruction.
467 goto run_stub;
468 }
469 else if (thread->thread_state() == _thread_in_vm &&
470 sig == SIGBUS && thread->doing_unsafe_access()) {
471 address next_pc = pc + 4;
472 next_pc = SharedRuntime::handle_unsafe_access(thread, next_pc);
473 os::Aix::ucontext_set_pc(uc, next_pc);
474 return 1;
475 }
476 }
477
478 // Check to see if we caught the safepoint code in the
479 // process of write protecting the memory serialization page.
480 // It write enables the page immediately after protecting it
481 // so we can just return to retry the write.
482 if ((sig == SIGSEGV) &&
483 os::is_memory_serialize_page(thread, addr)) {
484 // Synchronization problem in the pseudo memory barrier code (bug id 6546278)
485 // Block current thread until the memory serialize page permission restored.
486 os::block_on_serialize_page_trap();
487 return true;
488 }
489 }
490
491 run_stub:
492
493 // One of the above code blocks ininitalized the stub, so we want to
494 // delegate control to that stub.
495 if (stub != NULL) {
496 // Save all thread context in case we need to restore it.
497 if (thread != NULL) thread->set_saved_exception_pc(pc);
498 os::Aix::ucontext_set_pc(uc, stub);
499 return 1;
500 }
501
502 run_chained_handler:
503
504 // signal-chaining
505 if (os::Aix::chained_handler(sig, info, ucVoid)) {
506 return 1;
507 }
508 if (!abort_if_unrecognized) {
509 // caller wants another chance, so give it to him
510 return 0;
511 }
512
513 report_and_die:
514
515 // Use sigthreadmask instead of sigprocmask on AIX and unmask current signal.
516 sigset_t newset;
517 sigemptyset(&newset);
518 sigaddset(&newset, sig);
519 sigthreadmask(SIG_UNBLOCK, &newset, NULL);
520
521 VMError::report_and_die(t, sig, pc, info, ucVoid);
522
523 ShouldNotReachHere();
524 return 0;
525 }
526
527 void os::Aix::init_thread_fpu_state(void) {
528 #if !defined(USE_XLC_BUILTINS)
529 // Disable FP exceptions.
530 __asm__ __volatile__ ("mtfsfi 6,0");
531 #else
532 __mtfsfi(6, 0);
533 #endif
534 }
535
536 ////////////////////////////////////////////////////////////////////////////////
537 // thread stack
538
539 // Minimum usable stack sizes required to get to user code. Space for
540 // HotSpot guard pages is added later.
541 size_t os::Posix::_compiler_thread_min_stack_allowed = 192 * K;
542 size_t os::Posix::_java_thread_min_stack_allowed = 64 * K;
543 size_t os::Posix::_vm_internal_thread_min_stack_allowed = 64 * K;
544
545 // Return default stack size for thr_type.
546 size_t os::Posix::default_stack_size(os::ThreadType thr_type) {
547 // Default stack size (compiler thread needs larger stack).
548 size_t s = (thr_type == os::compiler_thread ? 4 * M : 1 * M);
549 return s;
550 }
551
552 /////////////////////////////////////////////////////////////////////////////
553 // helper functions for fatal error handler
554
555 void os::print_context(outputStream *st, const void *context) {
556 if (context == NULL) return;
557
558 const ucontext_t* uc = (const ucontext_t*)context;
559
560 st->print_cr("Registers:");
561 st->print("pc =" INTPTR_FORMAT " ", uc->uc_mcontext.jmp_context.iar);
562 st->print("lr =" INTPTR_FORMAT " ", uc->uc_mcontext.jmp_context.lr);
563 st->print("ctr=" INTPTR_FORMAT " ", uc->uc_mcontext.jmp_context.ctr);
564 st->cr();
565 for (int i = 0; i < 32; i++) {
566 st->print("r%-2d=" INTPTR_FORMAT " ", i, uc->uc_mcontext.jmp_context.gpr[i]);
567 if (i % 3 == 2) st->cr();
568 }
569 st->cr();
570 st->cr();
571
572 intptr_t *sp = (intptr_t *)os::Aix::ucontext_get_sp(uc);
573 st->print_cr("Top of Stack: (sp=" PTR_FORMAT ")", sp);
574 print_hex_dump(st, (address)sp, (address)(sp + 128), sizeof(intptr_t));
575 st->cr();
576
577 // Note: it may be unsafe to inspect memory near pc. For example, pc may
578 // point to garbage if entry point in an nmethod is corrupted. Leave
579 // this at the end, and hope for the best.
580 address pc = os::Aix::ucontext_get_pc(uc);
581 st->print_cr("Instructions: (pc=" PTR_FORMAT ")", pc);
582 print_hex_dump(st, pc - 64, pc + 64, /*instrsize=*/4);
583 st->cr();
584
585 // Try to decode the instructions.
586 st->print_cr("Decoded instructions: (pc=" PTR_FORMAT ")", pc);
587 st->print("<TODO: PPC port - print_context>");
588 // TODO: PPC port Disassembler::decode(pc, 16, 16, st);
589 st->cr();
590 }
591
592 void os::print_register_info(outputStream *st, const void *context) {
593 if (context == NULL) return;
594
595 ucontext_t *uc = (ucontext_t*)context;
596
597 st->print_cr("Register to memory mapping:");
598 st->cr();
599
600 st->print("pc ="); print_location(st, (intptr_t)uc->uc_mcontext.jmp_context.iar);
601 st->print("lr ="); print_location(st, (intptr_t)uc->uc_mcontext.jmp_context.lr);
602 st->print("sp ="); print_location(st, (intptr_t)os::Aix::ucontext_get_sp(uc));
603 for (int i = 0; i < 32; i++) {
604 st->print("r%-2d=", i);
605 print_location(st, (intptr_t)uc->uc_mcontext.jmp_context.gpr[i]);
606 }
607
608 st->cr();
609 }
610
611 extern "C" {
612 int SpinPause() {
613 return 0;
614 }
615 }
616
617 #ifndef PRODUCT
618 void os::verify_stack_alignment() {
619 assert(((intptr_t)os::current_stack_pointer() & (StackAlignmentInBytes-1)) == 0, "incorrect stack alignment");
620 }
621 #endif
622
623 int os::extra_bang_size_in_bytes() {
624 // PPC does not require the additional stack bang.
625 return 0;
626 }
627
628 bool os::platform_print_native_stack(outputStream* st, void* context, char *buf, int buf_size) {
629 AixNativeCallstack::print_callstack_for_context(st, (const ucontext_t*)context, true, buf, (size_t) buf_size);
630 return true;
631 }
632
633