1 /*
2 * Copyright (c) 2016, 2017, Oracle and/or its affiliates. All rights reserved.
3 * Copyright (c) 2016, 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 // This file is organized as os_linux_x86.cpp.
27
28 // no precompiled headers
29 #include "jvm.h"
30 #include "asm/assembler.inline.hpp"
31 #include "classfile/classLoader.hpp"
32 #include "classfile/systemDictionary.hpp"
33 #include "classfile/vmSymbols.hpp"
34 #include "code/icBuffer.hpp"
35 #include "code/nativeInst.hpp"
36 #include "code/vtableStubs.hpp"
37 #include "compiler/disassembler.hpp"
38 #include "interpreter/interpreter.hpp"
39 #include "memory/allocation.inline.hpp"
40 #include "nativeInst_s390.hpp"
41 #include "os_share_linux.hpp"
42 #include "prims/jniFastGetField.hpp"
43 #include "prims/jvm_misc.hpp"
44 #include "runtime/arguments.hpp"
45 #include "runtime/extendedPC.hpp"
46 #include "runtime/frame.inline.hpp"
47 #include "runtime/interfaceSupport.hpp"
48 #include "runtime/java.hpp"
49 #include "runtime/javaCalls.hpp"
50 #include "runtime/mutexLocker.hpp"
51 #include "runtime/osThread.hpp"
52 #include "runtime/sharedRuntime.hpp"
53 #include "runtime/stubRoutines.hpp"
54 #include "runtime/thread.inline.hpp"
55 #include "runtime/timer.hpp"
56 #include "utilities/events.hpp"
57 #include "utilities/vmError.hpp"
58
59 // put OS-includes here
60 # include <sys/types.h>
61 # include <sys/mman.h>
62 # include <pthread.h>
63 # include <signal.h>
64 # include <errno.h>
65 # include <dlfcn.h>
66 # include <stdlib.h>
67 # include <stdio.h>
68 # include <unistd.h>
69 # include <sys/resource.h>
70 # include <pthread.h>
71 # include <sys/stat.h>
72 # include <sys/time.h>
73 # include <sys/utsname.h>
74 # include <sys/socket.h>
75 # include <sys/wait.h>
76 # include <pwd.h>
77 # include <poll.h>
78 # include <ucontext.h>
79
80 address os::current_stack_pointer() {
81 intptr_t* csp;
82
83 // Inline assembly for `z_lgr regno(csp), Z_SP' (Z_SP = Z_R15):
84 __asm__ __volatile__ ("lgr %0, 15":"=r"(csp):);
85
86 assert(((uint64_t)csp & (frame::alignment_in_bytes-1)) == 0, "SP must be aligned");
87 return (address) csp;
88 }
89
90 char* os::non_memory_address_word() {
91 // Must never look like an address returned by reserve_memory,
92 // even in its subfields (as defined by the CPU immediate fields,
93 // if the CPU splits constants across multiple instructions).
94 return (char*) -1;
95 }
96
97 // OS specific thread initialization.
98 void os::initialize_thread(Thread* thread) { }
99
100 // Frame information (pc, sp, fp) retrieved via ucontext
101 // always looks like a C-frame according to the frame
102 // conventions in frame_s390.hpp.
103 address os::Linux::ucontext_get_pc(const ucontext_t * uc) {
104 return (address)uc->uc_mcontext.psw.addr;
105 }
106
107 void os::Linux::ucontext_set_pc(ucontext_t * uc, address pc) {
108 uc->uc_mcontext.psw.addr = (unsigned long)pc;
109 }
110
111 intptr_t* os::Linux::ucontext_get_sp(const ucontext_t * uc) {
112 return (intptr_t*)uc->uc_mcontext.gregs[15/*REG_SP*/];
113 }
114
115 intptr_t* os::Linux::ucontext_get_fp(const ucontext_t * uc) {
116 return NULL;
117 }
118
119 ExtendedPC os::fetch_frame_from_context(const void* ucVoid,
120 intptr_t** ret_sp, intptr_t** ret_fp) {
121
122 ExtendedPC epc;
123 const ucontext_t* uc = (const ucontext_t*)ucVoid;
124
125 if (uc != NULL) {
126 epc = ExtendedPC(os::Linux::ucontext_get_pc(uc));
127 if (ret_sp) { *ret_sp = os::Linux::ucontext_get_sp(uc); }
128 if (ret_fp) { *ret_fp = os::Linux::ucontext_get_fp(uc); }
129 } else {
130 // Construct empty ExtendedPC for return value checking.
131 epc = ExtendedPC(NULL);
132 if (ret_sp) { *ret_sp = (intptr_t *)NULL; }
133 if (ret_fp) { *ret_fp = (intptr_t *)NULL; }
134 }
135
136 return epc;
137 }
138
139 frame os::fetch_frame_from_context(const void* ucVoid) {
140 intptr_t* sp;
141 intptr_t* fp;
142 ExtendedPC epc = fetch_frame_from_context(ucVoid, &sp, &fp);
143 return frame(sp, epc.pc());
144 }
145
146 bool os::Linux::get_frame_at_stack_banging_point(JavaThread* thread, ucontext_t* uc, frame* fr) {
147 address pc = (address) os::Linux::ucontext_get_pc(uc);
148 if (Interpreter::contains(pc)) {
149 // Interpreter performs stack banging after the fixed frame header has
150 // been generated while the compilers perform it before. To maintain
151 // semantic consistency between interpreted and compiled frames, the
152 // method returns the Java sender of the current frame.
153 *fr = os::fetch_frame_from_context(uc);
154 if (!fr->is_first_java_frame()) {
155 assert(fr->safe_for_sender(thread), "Safety check");
156 *fr = fr->java_sender();
157 }
158 } else {
159 // More complex code with compiled code.
160 assert(!Interpreter::contains(pc), "Interpreted methods should have been handled above");
161 CodeBlob* cb = CodeCache::find_blob(pc);
162 if (cb == NULL || !cb->is_nmethod() || cb->is_frame_complete_at(pc)) {
163 // Not sure where the pc points to, fallback to default
164 // stack overflow handling. In compiled code, we bang before
165 // the frame is complete.
166 return false;
167 } else {
168 intptr_t* fp = os::Linux::ucontext_get_fp(uc);
169 intptr_t* sp = os::Linux::ucontext_get_sp(uc);
170 *fr = frame(sp, (address)*sp);
171 if (!fr->is_java_frame()) {
172 assert(fr->safe_for_sender(thread), "Safety check");
173 assert(!fr->is_first_frame(), "Safety check");
174 *fr = fr->java_sender();
175 }
176 }
177 }
178 assert(fr->is_java_frame(), "Safety check");
179 return true;
180 }
181
182 frame os::get_sender_for_C_frame(frame* fr) {
183 if (*fr->sp() == 0) {
184 // fr is the last C frame.
185 return frame();
186 }
187
188 // If its not one of our frames, the return pc is saved at gpr14
189 // stack slot. The call_stub stores the return_pc to the stack slot
190 // of gpr10.
191 if ((Interpreter::code() != NULL && Interpreter::contains(fr->pc())) ||
192 (CodeCache::contains(fr->pc()) && !StubRoutines::contains(fr->pc()))) {
193 return frame(fr->sender_sp(), fr->sender_pc());
194 } else {
195 if (StubRoutines::contains(fr->pc())) {
196 StubCodeDesc* desc = StubCodeDesc::desc_for(fr->pc());
197 if (desc && !strcmp(desc->name(),"call_stub")) {
198 return frame(fr->sender_sp(), fr->callstub_sender_pc());
199 } else {
200 return frame(fr->sender_sp(), fr->sender_pc());
201 }
202 } else {
203 return frame(fr->sender_sp(), fr->native_sender_pc());
204 }
205 }
206 }
207
208 frame os::current_frame() {
209 // Expected to return the stack pointer of this method.
210 // But if inlined, returns the stack pointer of our caller!
211 intptr_t* csp = (intptr_t*) *((intptr_t*) os::current_stack_pointer());
212 assert (csp != NULL, "sp should not be NULL");
213 // Pass a dummy pc. This way we don't have to load it from the
214 // stack, since we don't know in which slot we can find it.
215 frame topframe(csp, (address)0x8);
216 if (os::is_first_C_frame(&topframe)) {
217 // Stack is not walkable.
218 return frame();
219 } else {
220 frame senderFrame = os::get_sender_for_C_frame(&topframe);
221 assert(senderFrame.pc() != NULL, "Sender pc should not be NULL");
222 // Return sender of sender of current topframe which hopefully
223 // both have pc != NULL.
224 #ifdef _NMT_NOINLINE_ // Is set in slowdebug builds.
225 // Current_stack_pointer is not inlined, we must pop one more frame.
226 frame tmp = os::get_sender_for_C_frame(&topframe);
227 return os::get_sender_for_C_frame(&tmp);
228 #else
229 return os::get_sender_for_C_frame(&topframe);
230 #endif
231 }
232 }
233
234 // Utility functions
235
236 extern "C" JNIEXPORT int
237 JVM_handle_linux_signal(int sig,
238 siginfo_t* info,
239 void* ucVoid,
240 int abort_if_unrecognized) {
241 ucontext_t* uc = (ucontext_t*) ucVoid;
242
243 Thread* t = Thread::current_or_null_safe();
244
245 // Must do this before SignalHandlerMark, if crash protection installed we will longjmp away
246 // (no destructors can be run).
247 os::ThreadCrashProtection::check_crash_protection(sig, t);
248
249 SignalHandlerMark shm(t);
250
251 // Note: it's not uncommon that JNI code uses signal/sigset to install
252 // then restore certain signal handler (e.g. to temporarily block SIGPIPE,
253 // or have a SIGILL handler when detecting CPU type). When that happens,
254 // JVM_handle_linux_signal() might be invoked with junk info/ucVoid. To
255 // avoid unnecessary crash when libjsig is not preloaded, try handle signals
256 // that do not require siginfo/ucontext first.
257
258 if (sig == SIGPIPE) {
259 if (os::Linux::chained_handler(sig, info, ucVoid)) {
260 return true;
261 } else {
262 if (PrintMiscellaneous && (WizardMode || Verbose)) {
263 warning("Ignoring SIGPIPE - see bug 4229104");
264 }
265 return true;
266 }
267 }
268
269 JavaThread* thread = NULL;
270 VMThread* vmthread = NULL;
271 if (os::Linux::signal_handlers_are_installed) {
272 if (t != NULL) {
273 if(t->is_Java_thread()) {
274 thread = (JavaThread*)t;
275 } else if(t->is_VM_thread()) {
276 vmthread = (VMThread *)t;
277 }
278 }
279 }
280
281 // Moved SafeFetch32 handling outside thread!=NULL conditional block to make
282 // it work if no associated JavaThread object exists.
283 if (uc) {
284 address const pc = os::Linux::ucontext_get_pc(uc);
285 if (pc && StubRoutines::is_safefetch_fault(pc)) {
286 os::Linux::ucontext_set_pc(uc, StubRoutines::continuation_for_safefetch_fault(pc));
287 return true;
288 }
289 }
290
291 // Decide if this trap can be handled by a stub.
292 address stub = NULL;
293 address pc = NULL; // Pc as retrieved from PSW. Usually points past failing instruction.
294 address trap_pc = NULL; // Pc of the instruction causing the trap.
295
296 //%note os_trap_1
297 if (info != NULL && uc != NULL && thread != NULL) {
298 pc = os::Linux::ucontext_get_pc(uc);
299 if (TraceTraps) {
300 tty->print_cr(" pc at " INTPTR_FORMAT, p2i(pc));
301 }
302 if ((unsigned long)(pc - (address)info->si_addr) <= (unsigned long)Assembler::instr_maxlen() ) {
303 trap_pc = (address)info->si_addr;
304 if (TraceTraps) {
305 tty->print_cr("trap_pc at " INTPTR_FORMAT, p2i(trap_pc));
306 }
307 }
308
309 // Handle ALL stack overflow variations here
310 if (sig == SIGSEGV) {
311 address addr = (address)info->si_addr; // Address causing SIGSEGV, usually mem ref target.
312
313 // Check if fault address is within thread stack.
314 if (thread->on_local_stack(addr)) {
315 // stack overflow
316 if (thread->in_stack_yellow_reserved_zone(addr)) {
317 if (thread->thread_state() == _thread_in_Java) {
318 if (thread->in_stack_reserved_zone(addr)) {
319 frame fr;
320 if (os::Linux::get_frame_at_stack_banging_point(thread, uc, &fr)) {
321 assert(fr.is_java_frame(), "Must be a Javac frame");
322 frame activation =
323 SharedRuntime::look_for_reserved_stack_annotated_method(thread, fr);
324 if (activation.sp() != NULL) {
325 thread->disable_stack_reserved_zone();
326 if (activation.is_interpreted_frame()) {
327 thread->set_reserved_stack_activation((address)activation.fp());
328 } else {
329 thread->set_reserved_stack_activation((address)activation.unextended_sp());
330 }
331 return 1;
332 }
333 }
334 }
335 // Throw a stack overflow exception.
336 // Guard pages will be reenabled while unwinding the stack.
337 thread->disable_stack_yellow_reserved_zone();
338 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW);
339 } else {
340 // Thread was in the vm or native code. Return and try to finish.
341 thread->disable_stack_yellow_reserved_zone();
342 return 1;
343 }
344 } else if (thread->in_stack_red_zone(addr)) {
345 // Fatal red zone violation. Disable the guard pages and fall through
346 // to handle_unexpected_exception way down below.
347 thread->disable_stack_red_zone();
348 tty->print_raw_cr("An irrecoverable stack overflow has occurred.");
349
350 // This is a likely cause, but hard to verify. Let's just print
351 // it as a hint.
352 tty->print_raw_cr("Please check if any of your loaded .so files has "
353 "enabled executable stack (see man page execstack(8))");
354 } else {
355 // Accessing stack address below sp may cause SEGV if current
356 // thread has MAP_GROWSDOWN stack. This should only happen when
357 // current thread was created by user code with MAP_GROWSDOWN flag
358 // and then attached to VM. See notes in os_linux.cpp.
359 if (thread->osthread()->expanding_stack() == 0) {
360 thread->osthread()->set_expanding_stack();
361 if (os::Linux::manually_expand_stack(thread, addr)) {
362 thread->osthread()->clear_expanding_stack();
363 return 1;
364 }
365 thread->osthread()->clear_expanding_stack();
366 } else {
367 fatal("recursive segv. expanding stack.");
368 }
369 }
370 }
371 }
372
373 if (thread->thread_state() == _thread_in_Java) {
374 // Java thread running in Java code => find exception handler if any
375 // a fault inside compiled code, the interpreter, or a stub
376
377 // Handle signal from NativeJump::patch_verified_entry().
378 if (sig == SIGILL && nativeInstruction_at(pc)->is_sigill_zombie_not_entrant()) {
379 if (TraceTraps) {
380 tty->print_cr("trap: zombie_not_entrant (SIGILL)");
381 }
382 stub = SharedRuntime::get_handle_wrong_method_stub();
383 }
384
385 else if (sig == SIGSEGV &&
386 os::is_poll_address((address)info->si_addr)) {
387 if (TraceTraps) {
388 tty->print_cr("trap: safepoint_poll at " INTPTR_FORMAT " (SIGSEGV)", p2i(pc));
389 }
390 stub = SharedRuntime::get_poll_stub(pc);
391
392 // Info->si_addr only points to the page base address, so we
393 // must extract the real si_addr from the instruction and the
394 // ucontext.
395 assert(((NativeInstruction*)pc)->is_safepoint_poll(), "must be safepoint poll");
396 const address real_si_addr = ((NativeInstruction*)pc)->get_poll_address(uc);
397 }
398
399 // SIGTRAP-based implicit null check in compiled code.
400 else if ((sig == SIGFPE) &&
401 TrapBasedNullChecks &&
402 (trap_pc != NULL) &&
403 Assembler::is_sigtrap_zero_check(trap_pc)) {
404 if (TraceTraps) {
405 tty->print_cr("trap: NULL_CHECK at " INTPTR_FORMAT " (SIGFPE)", p2i(trap_pc));
406 }
407 stub = SharedRuntime::continuation_for_implicit_exception(thread, trap_pc, SharedRuntime::IMPLICIT_NULL);
408 }
409
410 else if (sig == SIGSEGV && ImplicitNullChecks &&
411 CodeCache::contains((void*) pc) &&
412 !MacroAssembler::needs_explicit_null_check((intptr_t) info->si_addr)) {
413 if (TraceTraps) {
414 tty->print_cr("trap: null_check at " INTPTR_FORMAT " (SIGSEGV)", p2i(pc));
415 }
416 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
417 }
418
419 // SIGTRAP-based implicit range check in compiled code.
420 else if (sig == SIGFPE && TrapBasedRangeChecks &&
421 (trap_pc != NULL) &&
422 Assembler::is_sigtrap_range_check(trap_pc)) {
423 if (TraceTraps) {
424 tty->print_cr("trap: RANGE_CHECK at " INTPTR_FORMAT " (SIGFPE)", p2i(trap_pc));
425 }
426 stub = SharedRuntime::continuation_for_implicit_exception(thread, trap_pc, SharedRuntime::IMPLICIT_NULL);
427 }
428
429 else if (sig == SIGFPE && info->si_code == FPE_INTDIV) {
430 stub = SharedRuntime::continuation_for_implicit_exception(thread, trap_pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO);
431 }
432
433 else if (sig == SIGBUS) {
434 // BugId 4454115: A read from a MappedByteBuffer can fault here if the
435 // underlying file has been truncated. Do not crash the VM in such a case.
436 CodeBlob* cb = CodeCache::find_blob_unsafe(pc);
437 CompiledMethod* nm = (cb != NULL) ? cb->as_compiled_method_or_null() : NULL;
438 if (nm != NULL && nm->has_unsafe_access()) {
439 // We don't really need a stub here! Just set the pending exeption and
440 // continue at the next instruction after the faulting read. Returning
441 // garbage from this read is ok.
442 thread->set_pending_unsafe_access_error();
443 uc->uc_mcontext.psw.addr = ((unsigned long)pc) + Assembler::instr_len(pc);
444 return true;
445 }
446 }
447 }
448
449 else { // thread->thread_state() != _thread_in_Java
450 if ((sig == SIGILL) && VM_Version::is_determine_features_test_running()) {
451 // SIGILL must be caused by VM_Version::determine_features()
452 // when attempting to execute a non-existing instruction.
453 //*(int *) (pc-6)=0; // Patch instruction to 0 to indicate that it causes a SIGILL.
454 // Flushing of icache is not necessary.
455 stub = pc; // Continue with next instruction.
456 } else if ((sig == SIGFPE) && VM_Version::is_determine_features_test_running()) {
457 // SIGFPE is known to be caused by trying to execute a vector instruction
458 // when the vector facility is installed, but operating system support is missing.
459 VM_Version::reset_has_VectorFacility();
460 stub = pc; // Continue with next instruction.
461 } else if (thread->thread_state() == _thread_in_vm &&
462 sig == SIGBUS && thread->doing_unsafe_access()) {
463 // We don't really need a stub here! Just set the pending exeption and
464 // continue at the next instruction after the faulting read. Returning
465 // garbage from this read is ok.
466 thread->set_pending_unsafe_access_error();
467 os::Linux::ucontext_set_pc(uc, pc + Assembler::instr_len(pc));
468 return true;
469 }
470 }
471
472 // Check to see if we caught the safepoint code in the
473 // process of write protecting the memory serialization page.
474 // It write enables the page immediately after protecting it
475 // so we can just return to retry the write.
476 // Info->si_addr need not be the exact address, it is only
477 // guaranteed to be on the same page as the address that caused
478 // the SIGSEGV.
479 if ((sig == SIGSEGV) && !UseMembar &&
480 (os::get_memory_serialize_page() ==
481 (address)((uintptr_t)info->si_addr & ~(os::vm_page_size()-1)))) {
482 return true;
483 }
484 }
485
486 if (stub != NULL) {
487 // Save all thread context in case we need to restore it.
488 if (thread != NULL) thread->set_saved_exception_pc(pc);
489 os::Linux::ucontext_set_pc(uc, stub);
490 return true;
491 }
492
493 // signal-chaining
494 if (os::Linux::chained_handler(sig, info, ucVoid)) {
495 return true;
496 }
497
498 if (!abort_if_unrecognized) {
499 // caller wants another chance, so give it to him
500 return false;
501 }
502
503 if (pc == NULL && uc != NULL) {
504 pc = os::Linux::ucontext_get_pc(uc);
505 }
506
507 // unmask current signal
508 sigset_t newset;
509 sigemptyset(&newset);
510 sigaddset(&newset, sig);
511 sigprocmask(SIG_UNBLOCK, &newset, NULL);
512
513 // Hand down correct pc for SIGILL, SIGFPE. pc from context
514 // usually points to the instruction after the failing instruction.
515 // Note: this should be combined with the trap_pc handling above,
516 // because it handles the same issue.
517 if (sig == SIGILL || sig == SIGFPE) {
518 pc = (address)info->si_addr;
519 }
520
521 VMError::report_and_die(t, sig, pc, info, ucVoid);
522
523 ShouldNotReachHere();
524 return false;
525 }
526
527 void os::Linux::init_thread_fpu_state(void) {
528 // Nothing to do on z/Architecture.
529 }
530
531 int os::Linux::get_fpu_control_word(void) {
532 // Nothing to do on z/Architecture.
533 return 0;
534 }
535
536 void os::Linux::set_fpu_control_word(int fpu_control) {
537 // Nothing to do on z/Architecture.
538 }
539
540 ////////////////////////////////////////////////////////////////////////////////
541 // thread stack
542
543 // Minimum usable stack sizes required to get to user code. Space for
544 // HotSpot guard pages is added later.
545 size_t os::Posix::_compiler_thread_min_stack_allowed = (52 DEBUG_ONLY(+ 32)) * K;
546 size_t os::Posix::_java_thread_min_stack_allowed = (32 DEBUG_ONLY(+ 8)) * K;
547 size_t os::Posix::_vm_internal_thread_min_stack_allowed = 32 * K;
548
549 // Return default stack size for thr_type.
550 size_t os::Posix::default_stack_size(os::ThreadType thr_type) {
551 // Default stack size (compiler thread needs larger stack).
552 size_t s = (thr_type == os::compiler_thread ? 4 * M : 1024 * K);
553 return s;
554 }
555
556 /////////////////////////////////////////////////////////////////////////////
557 // helper functions for fatal error handler
558
559 void os::print_context(outputStream *st, const void *context) {
560 if (context == NULL) return;
561
562 const ucontext_t* uc = (const ucontext_t*)context;
563
564 st->print_cr("Processor state:");
565 st->print_cr("----------------");
566 st->print_cr(" ip = " INTPTR_FORMAT " ", uc->uc_mcontext.psw.addr);
567 st->print_cr(" proc mask = " INTPTR_FORMAT " ", uc->uc_mcontext.psw.mask);
568 st->print_cr(" fpc reg = 0x%8.8x " , uc->uc_mcontext.fpregs.fpc);
569 st->cr();
570
571 st->print_cr("General Purpose Registers:");
572 st->print_cr("--------------------------");
573 for( int i = 0; i < 16; i+=2 ) {
574 st->print(" r%-2d = " INTPTR_FORMAT " " , i, uc->uc_mcontext.gregs[i]);
575 st->print(" r%-2d = " INTPTR_FORMAT " |", i+1, uc->uc_mcontext.gregs[i+1]);
576 st->print(" r%-2d = %23.1ld " , i, uc->uc_mcontext.gregs[i]);
577 st->print(" r%-2d = %23.1ld " , i+1, uc->uc_mcontext.gregs[i+1]);
578 st->cr();
579 }
580 st->cr();
581
582 st->print_cr("Access Registers:");
583 st->print_cr("-----------------");
584 for( int i = 0; i < 16; i+=2 ) {
585 st->print(" ar%-2d = 0x%8.8x ", i, uc->uc_mcontext.aregs[i]);
586 st->print(" ar%-2d = 0x%8.8x ", i+1, uc->uc_mcontext.aregs[i+1]);
587 st->cr();
588 }
589 st->cr();
590
591 st->print_cr("Float Registers:");
592 st->print_cr("----------------");
593 for (int i = 0; i < 16; i += 2) {
594 st->print(" fr%-2d = " INTPTR_FORMAT " " , i, (int64_t)(uc->uc_mcontext.fpregs.fprs[i].d));
595 st->print(" fr%-2d = " INTPTR_FORMAT " |", i+1, (int64_t)(uc->uc_mcontext.fpregs.fprs[i+1].d));
596 st->print(" fr%-2d = %23.15e " , i, (uc->uc_mcontext.fpregs.fprs[i].d));
597 st->print(" fr%-2d = %23.15e " , i+1, (uc->uc_mcontext.fpregs.fprs[i+1].d));
598 st->cr();
599 }
600 st->cr();
601 st->cr();
602
603 intptr_t *sp = (intptr_t *)os::Linux::ucontext_get_sp(uc);
604 st->print_cr("Top of Stack: (sp=" PTR_FORMAT ")", p2i(sp));
605 print_hex_dump(st, (address)sp, (address)(sp + 128), sizeof(intptr_t));
606 st->cr();
607
608 // Note: it may be unsafe to inspect memory near pc. For example, pc may
609 // point to garbage if entry point in an nmethod is corrupted. Leave
610 // this at the end, and hope for the best.
611 address pc = os::Linux::ucontext_get_pc(uc);
612 if (Verbose) { st->print_cr("pc at " PTR_FORMAT, p2i(pc)); }
613 st->print_cr("Instructions: (pc=" PTR_FORMAT ")", p2i(pc));
614 print_hex_dump(st, pc-64, pc+64, /*intrsize=*/4);
615 st->cr();
616 }
617
618 void os::print_register_info(outputStream *st, const void *context) {
619 st->print("Not ported\n");
620 }
621
622 #ifndef PRODUCT
623 void os::verify_stack_alignment() {
624 }
625 #endif
626
627 int os::extra_bang_size_in_bytes() {
628 // z/Architecture does not require the additional stack bang.
629 return 0;
630 }