1 /*
2 * Copyright (c) 2016, 2018, Oracle and/or its affiliates. All rights reserved.
3 * Copyright (c) 2016, 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 // 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.inline.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/debug.hpp"
58 #include "utilities/vmError.hpp"
59
60 // put OS-includes here
61 # include <sys/types.h>
62 # include <sys/mman.h>
63 # include <pthread.h>
64 # include <signal.h>
65 # include <errno.h>
66 # include <dlfcn.h>
67 # include <stdlib.h>
68 # include <stdio.h>
69 # include <unistd.h>
70 # include <sys/resource.h>
71 # include <pthread.h>
72 # include <sys/stat.h>
73 # include <sys/time.h>
74 # include <sys/utsname.h>
75 # include <sys/socket.h>
76 # include <sys/wait.h>
77 # include <pwd.h>
78 # include <poll.h>
79 # include <ucontext.h>
80
81 address os::current_stack_pointer() {
82 intptr_t* csp;
83
84 // Inline assembly for `z_lgr regno(csp), Z_SP' (Z_SP = Z_R15):
85 __asm__ __volatile__ ("lgr %0, 15":"=r"(csp):);
86
87 assert(((uint64_t)csp & (frame::alignment_in_bytes-1)) == 0, "SP must be aligned");
88 return (address) csp;
89 }
90
91 char* os::non_memory_address_word() {
92 // Must never look like an address returned by reserve_memory,
93 // even in its subfields (as defined by the CPU immediate fields,
94 // if the CPU splits constants across multiple instructions).
95 return (char*) -1;
96 }
97
98 // OS specific thread initialization.
99 void os::initialize_thread(Thread* thread) { }
100
101 // Frame information (pc, sp, fp) retrieved via ucontext
102 // always looks like a C-frame according to the frame
103 // conventions in frame_s390.hpp.
104 address os::Linux::ucontext_get_pc(const ucontext_t * uc) {
105 return (address)uc->uc_mcontext.psw.addr;
106 }
107
108 void os::Linux::ucontext_set_pc(ucontext_t * uc, address pc) {
109 uc->uc_mcontext.psw.addr = (unsigned long)pc;
110 }
111
112 static address ucontext_get_lr(const ucontext_t * uc) {
113 return (address)uc->uc_mcontext.gregs[14/*LINK*/];
114 }
115
116 intptr_t* os::Linux::ucontext_get_sp(const ucontext_t * uc) {
117 return (intptr_t*)uc->uc_mcontext.gregs[15/*REG_SP*/];
118 }
119
120 intptr_t* os::Linux::ucontext_get_fp(const ucontext_t * uc) {
121 return NULL;
122 }
123
124 ExtendedPC os::fetch_frame_from_context(const void* ucVoid,
125 intptr_t** ret_sp, intptr_t** ret_fp) {
126
127 ExtendedPC epc;
128 const ucontext_t* uc = (const ucontext_t*)ucVoid;
129
130 if (uc != NULL) {
131 epc = ExtendedPC(os::Linux::ucontext_get_pc(uc));
132 if (ret_sp) { *ret_sp = os::Linux::ucontext_get_sp(uc); }
133 if (ret_fp) { *ret_fp = os::Linux::ucontext_get_fp(uc); }
134 } else {
135 // Construct empty ExtendedPC for return value checking.
136 epc = ExtendedPC(NULL);
137 if (ret_sp) { *ret_sp = (intptr_t *)NULL; }
138 if (ret_fp) { *ret_fp = (intptr_t *)NULL; }
139 }
140
141 return epc;
142 }
143
144 frame os::fetch_frame_from_context(const void* ucVoid) {
145 intptr_t* sp;
146 intptr_t* fp;
147 ExtendedPC epc = fetch_frame_from_context(ucVoid, &sp, &fp);
148 return frame(sp, epc.pc());
149 }
150
151 bool os::Linux::get_frame_at_stack_banging_point(JavaThread* thread, ucontext_t* uc, frame* fr) {
152 address pc = (address) os::Linux::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::Linux::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() == 0) {
189 // fr is the last C frame.
190 return frame();
191 }
192
193 // If its not one of our frames, the return pc is saved at gpr14
194 // stack slot. The call_stub stores the return_pc to the stack slot
195 // of gpr10.
196 if ((Interpreter::code() != NULL && Interpreter::contains(fr->pc())) ||
197 (CodeCache::contains(fr->pc()) && !StubRoutines::contains(fr->pc()))) {
198 return frame(fr->sender_sp(), fr->sender_pc());
199 } else {
200 if (StubRoutines::contains(fr->pc())) {
201 StubCodeDesc* desc = StubCodeDesc::desc_for(fr->pc());
202 if (desc && !strcmp(desc->name(),"call_stub")) {
203 return frame(fr->sender_sp(), fr->callstub_sender_pc());
204 } else {
205 return frame(fr->sender_sp(), fr->sender_pc());
206 }
207 } else {
208 return frame(fr->sender_sp(), fr->native_sender_pc());
209 }
210 }
211 }
212
213 frame os::current_frame() {
214 // Expected to return the stack pointer of this method.
215 // But if inlined, returns the stack pointer of our caller!
216 intptr_t* csp = (intptr_t*) *((intptr_t*) os::current_stack_pointer());
217 assert (csp != NULL, "sp should not be NULL");
218 // Pass a dummy pc. This way we don't have to load it from the
219 // stack, since we don't know in which slot we can find it.
220 frame topframe(csp, (address)0x8);
221 if (os::is_first_C_frame(&topframe)) {
222 // Stack is not walkable.
223 return frame();
224 } else {
225 frame senderFrame = os::get_sender_for_C_frame(&topframe);
226 assert(senderFrame.pc() != NULL, "Sender pc should not be NULL");
227 // Return sender of sender of current topframe which hopefully
228 // both have pc != NULL.
229 #ifdef _NMT_NOINLINE_ // Is set in slowdebug builds.
230 // Current_stack_pointer is not inlined, we must pop one more frame.
231 frame tmp = os::get_sender_for_C_frame(&topframe);
232 return os::get_sender_for_C_frame(&tmp);
233 #else
234 return os::get_sender_for_C_frame(&topframe);
235 #endif
236 }
237 }
238
239 // Utility functions
240
241 extern "C" JNIEXPORT int
242 JVM_handle_linux_signal(int sig,
243 siginfo_t* info,
244 void* ucVoid,
245 int abort_if_unrecognized) {
246 ucontext_t* uc = (ucontext_t*) ucVoid;
247
248 Thread* t = Thread::current_or_null_safe();
249
250 // Must do this before SignalHandlerMark, if crash protection installed we will longjmp away
251 // (no destructors can be run).
252 os::ThreadCrashProtection::check_crash_protection(sig, t);
253
254 SignalHandlerMark shm(t);
255
256 // Note: it's not uncommon that JNI code uses signal/sigset to install
257 // then restore certain signal handler (e.g. to temporarily block SIGPIPE,
258 // or have a SIGILL handler when detecting CPU type). When that happens,
259 // JVM_handle_linux_signal() might be invoked with junk info/ucVoid. To
260 // avoid unnecessary crash when libjsig is not preloaded, try handle signals
261 // that do not require siginfo/ucontext first.
262
263 if (sig == SIGPIPE) {
264 if (os::Linux::chained_handler(sig, info, ucVoid)) {
265 return true;
266 } else {
267 if (PrintMiscellaneous && (WizardMode || Verbose)) {
268 warning("Ignoring SIGPIPE - see bug 4229104");
269 }
270 return true;
271 }
272 }
273
274 #ifdef CAN_SHOW_REGISTERS_ON_ASSERT
275 if ((sig == SIGSEGV || sig == SIGBUS) && info != NULL && info->si_addr == g_assert_poison) {
276 handle_assert_poison_fault(ucVoid, info->si_addr);
277 return 1;
278 }
279 #endif
280
281 JavaThread* thread = NULL;
282 VMThread* vmthread = NULL;
283 if (os::Linux::signal_handlers_are_installed) {
284 if (t != NULL) {
285 if(t->is_Java_thread()) {
286 thread = (JavaThread*)t;
287 } else if(t->is_VM_thread()) {
288 vmthread = (VMThread *)t;
289 }
290 }
291 }
292
293 // Moved SafeFetch32 handling outside thread!=NULL conditional block to make
294 // it work if no associated JavaThread object exists.
295 if (uc) {
296 address const pc = os::Linux::ucontext_get_pc(uc);
297 if (pc && StubRoutines::is_safefetch_fault(pc)) {
298 os::Linux::ucontext_set_pc(uc, StubRoutines::continuation_for_safefetch_fault(pc));
299 return true;
300 }
301 }
302
303 // Decide if this trap can be handled by a stub.
304 address stub = NULL;
305 address pc = NULL; // Pc as retrieved from PSW. Usually points past failing instruction.
306 address trap_pc = NULL; // Pc of the instruction causing the trap.
307
308 //%note os_trap_1
309 if (info != NULL && uc != NULL && thread != NULL) {
310 pc = os::Linux::ucontext_get_pc(uc);
311 if (TraceTraps) {
312 tty->print_cr(" pc at " INTPTR_FORMAT, p2i(pc));
313 }
314 if ((unsigned long)(pc - (address)info->si_addr) <= (unsigned long)Assembler::instr_maxlen() ) {
315 trap_pc = (address)info->si_addr;
316 if (TraceTraps) {
317 tty->print_cr("trap_pc at " INTPTR_FORMAT, p2i(trap_pc));
318 }
319 }
320
321 // Handle ALL stack overflow variations here
322 if (sig == SIGSEGV) {
323 address addr = (address)info->si_addr; // Address causing SIGSEGV, usually mem ref target.
324
325 // Check if fault address is within thread stack.
326 if (thread->on_local_stack(addr)) {
327 // stack overflow
328 if (thread->in_stack_yellow_reserved_zone(addr)) {
329 if (thread->thread_state() == _thread_in_Java) {
330 if (thread->in_stack_reserved_zone(addr)) {
331 frame fr;
332 if (os::Linux::get_frame_at_stack_banging_point(thread, uc, &fr)) {
333 assert(fr.is_java_frame(), "Must be a Javac frame");
334 frame activation =
335 SharedRuntime::look_for_reserved_stack_annotated_method(thread, fr);
336 if (activation.sp() != NULL) {
337 thread->disable_stack_reserved_zone();
338 if (activation.is_interpreted_frame()) {
339 thread->set_reserved_stack_activation((address)activation.fp());
340 } else {
341 thread->set_reserved_stack_activation((address)activation.unextended_sp());
342 }
343 return 1;
344 }
345 }
346 }
347 // Throw a stack overflow exception.
348 // Guard pages will be reenabled while unwinding the stack.
349 thread->disable_stack_yellow_reserved_zone();
350 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW);
351 } else {
352 // Thread was in the vm or native code. Return and try to finish.
353 thread->disable_stack_yellow_reserved_zone();
354 return 1;
355 }
356 } else if (thread->in_stack_red_zone(addr)) {
357 // Fatal red zone violation. Disable the guard pages and fall through
358 // to handle_unexpected_exception way down below.
359 thread->disable_stack_red_zone();
360 tty->print_raw_cr("An irrecoverable stack overflow has occurred.");
361
362 // This is a likely cause, but hard to verify. Let's just print
363 // it as a hint.
364 tty->print_raw_cr("Please check if any of your loaded .so files has "
365 "enabled executable stack (see man page execstack(8))");
366 } else {
367 // Accessing stack address below sp may cause SEGV if current
368 // thread has MAP_GROWSDOWN stack. This should only happen when
369 // current thread was created by user code with MAP_GROWSDOWN flag
370 // and then attached to VM. See notes in os_linux.cpp.
371 if (thread->osthread()->expanding_stack() == 0) {
372 thread->osthread()->set_expanding_stack();
373 if (os::Linux::manually_expand_stack(thread, addr)) {
374 thread->osthread()->clear_expanding_stack();
375 return 1;
376 }
377 thread->osthread()->clear_expanding_stack();
378 } else {
379 fatal("recursive segv. expanding stack.");
380 }
381 }
382 }
383 }
384
385 if (thread->thread_state() == _thread_in_Java) {
386 // Java thread running in Java code => find exception handler if any
387 // a fault inside compiled code, the interpreter, or a stub
388
389 // Handle signal from NativeJump::patch_verified_entry().
390 if (sig == SIGILL && nativeInstruction_at(pc)->is_sigill_zombie_not_entrant()) {
391 if (TraceTraps) {
392 tty->print_cr("trap: zombie_not_entrant (SIGILL)");
393 }
394 stub = SharedRuntime::get_handle_wrong_method_stub();
395 }
396
397 else if (sig == SIGSEGV &&
398 os::is_poll_address((address)info->si_addr)) {
399 if (TraceTraps) {
400 tty->print_cr("trap: safepoint_poll at " INTPTR_FORMAT " (SIGSEGV)", p2i(pc));
401 }
402 stub = SharedRuntime::get_poll_stub(pc);
403
404 // Info->si_addr only points to the page base address, so we
405 // must extract the real si_addr from the instruction and the
406 // ucontext.
407 assert(((NativeInstruction*)pc)->is_safepoint_poll(), "must be safepoint poll");
408 const address real_si_addr = ((NativeInstruction*)pc)->get_poll_address(uc);
409 }
410
411 // SIGTRAP-based implicit null check in compiled code.
412 else if ((sig == SIGFPE) &&
413 TrapBasedNullChecks &&
414 (trap_pc != NULL) &&
415 Assembler::is_sigtrap_zero_check(trap_pc)) {
416 if (TraceTraps) {
417 tty->print_cr("trap: NULL_CHECK at " INTPTR_FORMAT " (SIGFPE)", p2i(trap_pc));
418 }
419 stub = SharedRuntime::continuation_for_implicit_exception(thread, trap_pc, SharedRuntime::IMPLICIT_NULL);
420 }
421
422 else if (sig == SIGSEGV && ImplicitNullChecks &&
423 CodeCache::contains((void*) pc) &&
424 !MacroAssembler::needs_explicit_null_check((intptr_t) info->si_addr)) {
425 if (TraceTraps) {
426 tty->print_cr("trap: null_check at " INTPTR_FORMAT " (SIGSEGV)", p2i(pc));
427 }
428 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
429 }
430
431 // SIGTRAP-based implicit range check in compiled code.
432 else if (sig == SIGFPE && TrapBasedRangeChecks &&
433 (trap_pc != NULL) &&
434 Assembler::is_sigtrap_range_check(trap_pc)) {
435 if (TraceTraps) {
436 tty->print_cr("trap: RANGE_CHECK at " INTPTR_FORMAT " (SIGFPE)", p2i(trap_pc));
437 }
438 stub = SharedRuntime::continuation_for_implicit_exception(thread, trap_pc, SharedRuntime::IMPLICIT_NULL);
439 }
440
441 else if (sig == SIGFPE && info->si_code == FPE_INTDIV) {
442 stub = SharedRuntime::continuation_for_implicit_exception(thread, trap_pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO);
443 }
444
445 else if (sig == SIGBUS) {
446 // BugId 4454115: A read from a MappedByteBuffer can fault here if the
447 // underlying file has been truncated. Do not crash the VM in such a case.
448 CodeBlob* cb = CodeCache::find_blob_unsafe(pc);
449 CompiledMethod* nm = (cb != NULL) ? cb->as_compiled_method_or_null() : NULL;
450 if (nm != NULL && nm->has_unsafe_access()) {
451 // We don't really need a stub here! Just set the pending exeption and
452 // continue at the next instruction after the faulting read. Returning
453 // garbage from this read is ok.
454 thread->set_pending_unsafe_access_error();
455 uc->uc_mcontext.psw.addr = ((unsigned long)pc) + Assembler::instr_len(pc);
456 return true;
457 }
458 }
459 }
460
461 else { // thread->thread_state() != _thread_in_Java
462 if ((sig == SIGILL) && VM_Version::is_determine_features_test_running()) {
463 // SIGILL must be caused by VM_Version::determine_features()
464 // when attempting to execute a non-existing instruction.
465 //*(int *) (pc-6)=0; // Patch instruction to 0 to indicate that it causes a SIGILL.
466 // Flushing of icache is not necessary.
467 stub = pc; // Continue with next instruction.
468 } else if ((sig == SIGFPE) && VM_Version::is_determine_features_test_running()) {
469 // SIGFPE is known to be caused by trying to execute a vector instruction
470 // when the vector facility is installed, but operating system support is missing.
471 VM_Version::reset_has_VectorFacility();
472 stub = pc; // Continue with next instruction.
473 } else if (thread->thread_state() == _thread_in_vm &&
474 sig == SIGBUS && thread->doing_unsafe_access()) {
475 // We don't really need a stub here! Just set the pending exeption and
476 // continue at the next instruction after the faulting read. Returning
477 // garbage from this read is ok.
478 thread->set_pending_unsafe_access_error();
479 os::Linux::ucontext_set_pc(uc, pc + Assembler::instr_len(pc));
480 return true;
481 }
482 }
483
484 // Check to see if we caught the safepoint code in the
485 // process of write protecting the memory serialization page.
486 // It write enables the page immediately after protecting it
487 // so we can just return to retry the write.
488 // Info->si_addr need not be the exact address, it is only
489 // guaranteed to be on the same page as the address that caused
490 // the SIGSEGV.
491 if ((sig == SIGSEGV) && !UseMembar &&
492 (os::get_memory_serialize_page() ==
493 (address)((uintptr_t)info->si_addr & ~(os::vm_page_size()-1)))) {
494 return true;
495 }
496 }
497
498 if (stub != NULL) {
499 // Save all thread context in case we need to restore it.
500 if (thread != NULL) thread->set_saved_exception_pc(pc);
501 os::Linux::ucontext_set_pc(uc, stub);
502 return true;
503 }
504
505 // signal-chaining
506 if (os::Linux::chained_handler(sig, info, ucVoid)) {
507 return true;
508 }
509
510 if (!abort_if_unrecognized) {
511 // caller wants another chance, so give it to him
512 return false;
513 }
514
515 if (pc == NULL && uc != NULL) {
516 pc = os::Linux::ucontext_get_pc(uc);
517 }
518
519 // unmask current signal
520 sigset_t newset;
521 sigemptyset(&newset);
522 sigaddset(&newset, sig);
523 sigprocmask(SIG_UNBLOCK, &newset, NULL);
524
525 // Hand down correct pc for SIGILL, SIGFPE. pc from context
526 // usually points to the instruction after the failing instruction.
527 // Note: this should be combined with the trap_pc handling above,
528 // because it handles the same issue.
529 if (sig == SIGILL || sig == SIGFPE) {
530 pc = (address)info->si_addr;
531 }
532
533 VMError::report_and_die(t, sig, pc, info, ucVoid);
534
535 ShouldNotReachHere();
536 return false;
537 }
538
539 void os::Linux::init_thread_fpu_state(void) {
540 // Nothing to do on z/Architecture.
541 }
542
543 int os::Linux::get_fpu_control_word(void) {
544 // Nothing to do on z/Architecture.
545 return 0;
546 }
547
548 void os::Linux::set_fpu_control_word(int fpu_control) {
549 // Nothing to do on z/Architecture.
550 }
551
552 ////////////////////////////////////////////////////////////////////////////////
553 // thread stack
554
555 // Minimum usable stack sizes required to get to user code. Space for
556 // HotSpot guard pages is added later.
557 size_t os::Posix::_compiler_thread_min_stack_allowed = (52 DEBUG_ONLY(+ 32)) * K;
558 size_t os::Posix::_java_thread_min_stack_allowed = (32 DEBUG_ONLY(+ 8)) * K;
559 size_t os::Posix::_vm_internal_thread_min_stack_allowed = 32 * K;
560
561 // Return default stack size for thr_type.
562 size_t os::Posix::default_stack_size(os::ThreadType thr_type) {
563 // Default stack size (compiler thread needs larger stack).
564 size_t s = (thr_type == os::compiler_thread ? 4 * M : 1024 * K);
565 return s;
566 }
567
568 /////////////////////////////////////////////////////////////////////////////
569 // helper functions for fatal error handler
570
571 void os::print_context(outputStream *st, const void *context) {
572 if (context == NULL) return;
573
574 const ucontext_t* uc = (const ucontext_t*)context;
575
576 st->print_cr("Processor state:");
577 st->print_cr("----------------");
578 st->print_cr(" ip = " INTPTR_FORMAT " ", uc->uc_mcontext.psw.addr);
579 st->print_cr(" proc mask = " INTPTR_FORMAT " ", uc->uc_mcontext.psw.mask);
580 st->print_cr(" fpc reg = 0x%8.8x " , uc->uc_mcontext.fpregs.fpc);
581 st->cr();
582
583 st->print_cr("General Purpose Registers:");
584 st->print_cr("--------------------------");
585 for( int i = 0; i < 16; i+=2 ) {
586 st->print(" r%-2d = " INTPTR_FORMAT " " , i, uc->uc_mcontext.gregs[i]);
587 st->print(" r%-2d = " INTPTR_FORMAT " |", i+1, uc->uc_mcontext.gregs[i+1]);
588 st->print(" r%-2d = %23.1ld " , i, uc->uc_mcontext.gregs[i]);
589 st->print(" r%-2d = %23.1ld " , i+1, uc->uc_mcontext.gregs[i+1]);
590 st->cr();
591 }
592 st->cr();
593
594 st->print_cr("Access Registers:");
595 st->print_cr("-----------------");
596 for( int i = 0; i < 16; i+=2 ) {
597 st->print(" ar%-2d = 0x%8.8x ", i, uc->uc_mcontext.aregs[i]);
598 st->print(" ar%-2d = 0x%8.8x ", i+1, uc->uc_mcontext.aregs[i+1]);
599 st->cr();
600 }
601 st->cr();
602
603 st->print_cr("Float Registers:");
604 st->print_cr("----------------");
605 for (int i = 0; i < 16; i += 2) {
606 st->print(" fr%-2d = " INTPTR_FORMAT " " , i, (int64_t)(uc->uc_mcontext.fpregs.fprs[i].d));
607 st->print(" fr%-2d = " INTPTR_FORMAT " |", i+1, (int64_t)(uc->uc_mcontext.fpregs.fprs[i+1].d));
608 st->print(" fr%-2d = %23.15e " , i, (uc->uc_mcontext.fpregs.fprs[i].d));
609 st->print(" fr%-2d = %23.15e " , i+1, (uc->uc_mcontext.fpregs.fprs[i+1].d));
610 st->cr();
611 }
612 st->cr();
613 st->cr();
614
615 intptr_t *sp = (intptr_t *)os::Linux::ucontext_get_sp(uc);
616 st->print_cr("Top of Stack: (sp=" PTR_FORMAT ")", p2i(sp));
617 print_hex_dump(st, (address)sp, (address)(sp + 128), sizeof(intptr_t));
618 st->cr();
619
620 // Note: it may be unsafe to inspect memory near pc. For example, pc may
621 // point to garbage if entry point in an nmethod is corrupted. Leave
622 // this at the end, and hope for the best.
623 address pc = os::Linux::ucontext_get_pc(uc);
624 if (Verbose) { st->print_cr("pc at " PTR_FORMAT, p2i(pc)); }
625 st->print_cr("Instructions: (pc=" PTR_FORMAT ")", p2i(pc));
626 print_hex_dump(st, pc-64, pc+64, /*intrsize=*/4);
627 st->cr();
628 }
629
630 void os::print_register_info(outputStream *st, const void *context) {
631 if (context == NULL) return;
632
633 const ucontext_t *uc = (const ucontext_t*)context;
634
635 st->print_cr("Register to memory mapping:");
636 st->cr();
637
638 st->print("pc ="); print_location(st, (intptr_t)uc->uc_mcontext.psw.addr);
639 for (int i = 0; i < 16; i++) {
640 st->print("r%-2d=", i);
641 print_location(st, uc->uc_mcontext.gregs[i]);
642 }
643 st->cr();
644 }
645
646 #ifndef PRODUCT
647 void os::verify_stack_alignment() {
648 }
649 #endif
650
651 int os::extra_bang_size_in_bytes() {
652 // z/Architecture does not require the additional stack bang.
653 return 0;
654 }