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 // Frame information (pc, sp, fp) retrieved via ucontext
99 // always looks like a C-frame according to the frame
100 // conventions in frame_s390.hpp.
101 address os::Linux::ucontext_get_pc(const ucontext_t * uc) {
102 return (address)uc->uc_mcontext.psw.addr;
103 }
104
105 void os::Linux::ucontext_set_pc(ucontext_t * uc, address pc) {
106 uc->uc_mcontext.psw.addr = (unsigned long)pc;
107 }
108
109 static address ucontext_get_lr(const ucontext_t * uc) {
110 return (address)uc->uc_mcontext.gregs[14/*LINK*/];
111 }
112
113 intptr_t* os::Linux::ucontext_get_sp(const ucontext_t * uc) {
114 return (intptr_t*)uc->uc_mcontext.gregs[15/*REG_SP*/];
115 }
116
117 intptr_t* os::Linux::ucontext_get_fp(const ucontext_t * uc) {
118 return NULL;
119 }
120
121 ExtendedPC os::fetch_frame_from_context(const void* ucVoid,
122 intptr_t** ret_sp, intptr_t** ret_fp) {
123
124 ExtendedPC epc;
125 const ucontext_t* uc = (const ucontext_t*)ucVoid;
126
127 if (uc != NULL) {
128 epc = ExtendedPC(os::Linux::ucontext_get_pc(uc));
129 if (ret_sp) { *ret_sp = os::Linux::ucontext_get_sp(uc); }
130 if (ret_fp) { *ret_fp = os::Linux::ucontext_get_fp(uc); }
131 } else {
132 // Construct empty ExtendedPC for return value checking.
133 epc = ExtendedPC(NULL);
134 if (ret_sp) { *ret_sp = (intptr_t *)NULL; }
135 if (ret_fp) { *ret_fp = (intptr_t *)NULL; }
136 }
137
138 return epc;
139 }
140
141 frame os::fetch_frame_from_context(const void* ucVoid) {
142 intptr_t* sp;
143 intptr_t* fp;
144 ExtendedPC epc = fetch_frame_from_context(ucVoid, &sp, &fp);
145 return frame(sp, epc.pc());
146 }
147
148 bool os::Linux::get_frame_at_stack_banging_point(JavaThread* thread, ucontext_t* uc, frame* fr) {
149 address pc = (address) os::Linux::ucontext_get_pc(uc);
150 if (Interpreter::contains(pc)) {
151 // Interpreter performs stack banging after the fixed frame header has
152 // been generated while the compilers perform it before. To maintain
153 // semantic consistency between interpreted and compiled frames, the
154 // method returns the Java sender of the current frame.
155 *fr = os::fetch_frame_from_context(uc);
156 if (!fr->is_first_java_frame()) {
157 assert(fr->safe_for_sender(thread), "Safety check");
158 *fr = fr->java_sender();
159 }
160 } else {
161 // More complex code with compiled code.
162 assert(!Interpreter::contains(pc), "Interpreted methods should have been handled above");
163 CodeBlob* cb = CodeCache::find_blob(pc);
164 if (cb == NULL || !cb->is_nmethod() || cb->is_frame_complete_at(pc)) {
165 // Not sure where the pc points to, fallback to default
166 // stack overflow handling. In compiled code, we bang before
167 // the frame is complete.
168 return false;
169 } else {
170 intptr_t* sp = os::Linux::ucontext_get_sp(uc);
171 address lr = ucontext_get_lr(uc);
172 *fr = frame(sp, lr);
173 if (!fr->is_java_frame()) {
174 assert(fr->safe_for_sender(thread), "Safety check");
175 assert(!fr->is_first_frame(), "Safety check");
176 *fr = fr->java_sender();
177 }
178 }
179 }
180 assert(fr->is_java_frame(), "Safety check");
181 return true;
182 }
183
184 frame os::get_sender_for_C_frame(frame* fr) {
185 if (*fr->sp() == 0) {
186 // fr is the last C frame.
187 return frame();
188 }
189
190 // If its not one of our frames, the return pc is saved at gpr14
191 // stack slot. The call_stub stores the return_pc to the stack slot
192 // of gpr10.
193 if ((Interpreter::code() != NULL && Interpreter::contains(fr->pc())) ||
194 (CodeCache::contains(fr->pc()) && !StubRoutines::contains(fr->pc()))) {
195 return frame(fr->sender_sp(), fr->sender_pc());
196 } else {
197 if (StubRoutines::contains(fr->pc())) {
198 StubCodeDesc* desc = StubCodeDesc::desc_for(fr->pc());
199 if (desc && !strcmp(desc->name(),"call_stub")) {
200 return frame(fr->sender_sp(), fr->callstub_sender_pc());
201 } else {
202 return frame(fr->sender_sp(), fr->sender_pc());
203 }
204 } else {
205 return frame(fr->sender_sp(), fr->native_sender_pc());
206 }
207 }
208 }
209
210 frame os::current_frame() {
211 // Expected to return the stack pointer of this method.
212 // But if inlined, returns the stack pointer of our caller!
213 intptr_t* csp = (intptr_t*) *((intptr_t*) os::current_stack_pointer());
214 assert (csp != NULL, "sp should not be NULL");
215 // Pass a dummy pc. This way we don't have to load it from the
216 // stack, since we don't know in which slot we can find it.
217 frame topframe(csp, (address)0x8);
218 if (os::is_first_C_frame(&topframe)) {
219 // Stack is not walkable.
220 return frame();
221 } else {
222 frame senderFrame = os::get_sender_for_C_frame(&topframe);
223 assert(senderFrame.pc() != NULL, "Sender pc should not be NULL");
224 // Return sender of sender of current topframe which hopefully
225 // both have pc != NULL.
226 #ifdef _NMT_NOINLINE_ // Is set in slowdebug builds.
227 // Current_stack_pointer is not inlined, we must pop one more frame.
228 frame tmp = os::get_sender_for_C_frame(&topframe);
229 return os::get_sender_for_C_frame(&tmp);
230 #else
231 return os::get_sender_for_C_frame(&topframe);
232 #endif
233 }
234 }
235
236 // Utility functions
237
238 extern "C" JNIEXPORT int
239 JVM_handle_linux_signal(int sig,
240 siginfo_t* info,
241 void* ucVoid,
242 int abort_if_unrecognized) {
243 ucontext_t* uc = (ucontext_t*) ucVoid;
244
245 Thread* t = Thread::current_or_null_safe();
246
247 // Must do this before SignalHandlerMark, if crash protection installed we will longjmp away
248 // (no destructors can be run).
249 os::ThreadCrashProtection::check_crash_protection(sig, t);
250
251 SignalHandlerMark shm(t);
252
253 // Note: it's not uncommon that JNI code uses signal/sigset to install
254 // then restore certain signal handler (e.g. to temporarily block SIGPIPE,
255 // or have a SIGILL handler when detecting CPU type). When that happens,
256 // JVM_handle_linux_signal() might be invoked with junk info/ucVoid. To
257 // avoid unnecessary crash when libjsig is not preloaded, try handle signals
258 // that do not require siginfo/ucontext first.
259
260 if (sig == SIGPIPE) {
261 if (os::Linux::chained_handler(sig, info, ucVoid)) {
262 return true;
263 } else {
264 if (PrintMiscellaneous && (WizardMode || Verbose)) {
265 warning("Ignoring SIGPIPE - see bug 4229104");
266 }
267 return true;
268 }
269 }
270
271 #ifdef CAN_SHOW_REGISTERS_ON_ASSERT
272 if ((sig == SIGSEGV || sig == SIGBUS) && info != NULL && info->si_addr == g_assert_poison) {
273 handle_assert_poison_fault(ucVoid, info->si_addr);
274 return 1;
275 }
276 #endif
277
278 JavaThread* thread = NULL;
279 VMThread* vmthread = NULL;
280 if (os::Linux::signal_handlers_are_installed) {
281 if (t != NULL) {
282 if(t->is_Java_thread()) {
283 thread = (JavaThread*)t;
284 } else if(t->is_VM_thread()) {
285 vmthread = (VMThread *)t;
286 }
287 }
288 }
289
290 // Moved SafeFetch32 handling outside thread!=NULL conditional block to make
291 // it work if no associated JavaThread object exists.
292 if (uc) {
293 address const pc = os::Linux::ucontext_get_pc(uc);
294 if (pc && StubRoutines::is_safefetch_fault(pc)) {
295 os::Linux::ucontext_set_pc(uc, StubRoutines::continuation_for_safefetch_fault(pc));
296 return true;
297 }
298 }
299
300 // Decide if this trap can be handled by a stub.
301 address stub = NULL;
302 address pc = NULL; // Pc as retrieved from PSW. Usually points past failing instruction.
303 address trap_pc = NULL; // Pc of the instruction causing the trap.
304
305 //%note os_trap_1
306 if (info != NULL && uc != NULL && thread != NULL) {
307 pc = os::Linux::ucontext_get_pc(uc);
308 if (TraceTraps) {
309 tty->print_cr(" pc at " INTPTR_FORMAT, p2i(pc));
310 }
311 if ((unsigned long)(pc - (address)info->si_addr) <= (unsigned long)Assembler::instr_maxlen() ) {
312 trap_pc = (address)info->si_addr;
313 if (TraceTraps) {
314 tty->print_cr("trap_pc at " INTPTR_FORMAT, p2i(trap_pc));
315 }
316 }
317
318 // Handle ALL stack overflow variations here
319 if (sig == SIGSEGV) {
320 address addr = (address)info->si_addr; // Address causing SIGSEGV, usually mem ref target.
321
322 // Check if fault address is within thread stack.
323 if (thread->on_local_stack(addr)) {
324 // stack overflow
325 if (thread->in_stack_yellow_reserved_zone(addr)) {
326 if (thread->thread_state() == _thread_in_Java) {
327 if (thread->in_stack_reserved_zone(addr)) {
328 frame fr;
329 if (os::Linux::get_frame_at_stack_banging_point(thread, uc, &fr)) {
330 assert(fr.is_java_frame(), "Must be a Javac frame");
331 frame activation =
332 SharedRuntime::look_for_reserved_stack_annotated_method(thread, fr);
333 if (activation.sp() != NULL) {
334 thread->disable_stack_reserved_zone();
335 if (activation.is_interpreted_frame()) {
336 thread->set_reserved_stack_activation((address)activation.fp());
337 } else {
338 thread->set_reserved_stack_activation((address)activation.unextended_sp());
339 }
340 return 1;
341 }
342 }
343 }
344 // Throw a stack overflow exception.
345 // Guard pages will be reenabled while unwinding the stack.
346 thread->disable_stack_yellow_reserved_zone();
347 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW);
348 } else {
349 // Thread was in the vm or native code. Return and try to finish.
350 thread->disable_stack_yellow_reserved_zone();
351 return 1;
352 }
353 } else if (thread->in_stack_red_zone(addr)) {
354 // Fatal red zone violation. Disable the guard pages and fall through
355 // to handle_unexpected_exception way down below.
356 thread->disable_stack_red_zone();
357 tty->print_raw_cr("An irrecoverable stack overflow has occurred.");
358
359 // This is a likely cause, but hard to verify. Let's just print
360 // it as a hint.
361 tty->print_raw_cr("Please check if any of your loaded .so files has "
362 "enabled executable stack (see man page execstack(8))");
363 } else {
364 // Accessing stack address below sp may cause SEGV if current
365 // thread has MAP_GROWSDOWN stack. This should only happen when
366 // current thread was created by user code with MAP_GROWSDOWN flag
367 // and then attached to VM. See notes in os_linux.cpp.
368 if (thread->osthread()->expanding_stack() == 0) {
369 thread->osthread()->set_expanding_stack();
370 if (os::Linux::manually_expand_stack(thread, addr)) {
371 thread->osthread()->clear_expanding_stack();
372 return 1;
373 }
374 thread->osthread()->clear_expanding_stack();
375 } else {
376 fatal("recursive segv. expanding stack.");
377 }
378 }
379 }
380 }
381
382 if (thread->thread_state() == _thread_in_Java) {
383 // Java thread running in Java code => find exception handler if any
384 // a fault inside compiled code, the interpreter, or a stub
385
386 // Handle signal from NativeJump::patch_verified_entry().
387 if (sig == SIGILL && nativeInstruction_at(pc)->is_sigill_zombie_not_entrant()) {
388 if (TraceTraps) {
389 tty->print_cr("trap: zombie_not_entrant (SIGILL)");
390 }
391 stub = SharedRuntime::get_handle_wrong_method_stub();
392 }
393
394 else if (sig == SIGSEGV &&
395 os::is_poll_address((address)info->si_addr)) {
396 if (TraceTraps) {
397 tty->print_cr("trap: safepoint_poll at " INTPTR_FORMAT " (SIGSEGV)", p2i(pc));
398 }
399 stub = SharedRuntime::get_poll_stub(pc);
400
401 // Info->si_addr only points to the page base address, so we
402 // must extract the real si_addr from the instruction and the
403 // ucontext.
404 assert(((NativeInstruction*)pc)->is_safepoint_poll(), "must be safepoint poll");
405 const address real_si_addr = ((NativeInstruction*)pc)->get_poll_address(uc);
406 }
407
408 // SIGTRAP-based implicit null check in compiled code.
409 else if ((sig == SIGFPE) &&
410 TrapBasedNullChecks &&
411 (trap_pc != NULL) &&
412 Assembler::is_sigtrap_zero_check(trap_pc)) {
413 if (TraceTraps) {
414 tty->print_cr("trap: NULL_CHECK at " INTPTR_FORMAT " (SIGFPE)", p2i(trap_pc));
415 }
416 stub = SharedRuntime::continuation_for_implicit_exception(thread, trap_pc, SharedRuntime::IMPLICIT_NULL);
417 }
418
419 else if (sig == SIGSEGV && ImplicitNullChecks &&
420 CodeCache::contains((void*) pc) &&
421 !MacroAssembler::needs_explicit_null_check((intptr_t) info->si_addr)) {
422 if (TraceTraps) {
423 tty->print_cr("trap: null_check at " INTPTR_FORMAT " (SIGSEGV)", p2i(pc));
424 }
425 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
426 }
427
428 // SIGTRAP-based implicit range check in compiled code.
429 else if (sig == SIGFPE && TrapBasedRangeChecks &&
430 (trap_pc != NULL) &&
431 Assembler::is_sigtrap_range_check(trap_pc)) {
432 if (TraceTraps) {
433 tty->print_cr("trap: RANGE_CHECK at " INTPTR_FORMAT " (SIGFPE)", p2i(trap_pc));
434 }
435 stub = SharedRuntime::continuation_for_implicit_exception(thread, trap_pc, SharedRuntime::IMPLICIT_NULL);
436 }
437
438 else if (sig == SIGFPE && info->si_code == FPE_INTDIV) {
439 stub = SharedRuntime::continuation_for_implicit_exception(thread, trap_pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO);
440 }
441
442 else if (sig == SIGBUS) {
443 // BugId 4454115: A read from a MappedByteBuffer can fault here if the
444 // underlying file has been truncated. Do not crash the VM in such a case.
445 CodeBlob* cb = CodeCache::find_blob_unsafe(pc);
446 CompiledMethod* nm = (cb != NULL) ? cb->as_compiled_method_or_null() : NULL;
447 if (nm != NULL && nm->has_unsafe_access()) {
448 // We don't really need a stub here! Just set the pending exeption and
449 // continue at the next instruction after the faulting read. Returning
450 // garbage from this read is ok.
451 thread->set_pending_unsafe_access_error();
452 uc->uc_mcontext.psw.addr = ((unsigned long)pc) + Assembler::instr_len(pc);
453 return true;
454 }
455 }
456 }
457
458 else { // thread->thread_state() != _thread_in_Java
459 if ((sig == SIGILL) && VM_Version::is_determine_features_test_running()) {
460 // SIGILL must be caused by VM_Version::determine_features()
461 // when attempting to execute a non-existing instruction.
462 //*(int *) (pc-6)=0; // Patch instruction to 0 to indicate that it causes a SIGILL.
463 // Flushing of icache is not necessary.
464 stub = pc; // Continue with next instruction.
465 } else if ((sig == SIGFPE) && VM_Version::is_determine_features_test_running()) {
466 // SIGFPE is known to be caused by trying to execute a vector instruction
467 // when the vector facility is installed, but operating system support is missing.
468 VM_Version::reset_has_VectorFacility();
469 stub = pc; // Continue with next instruction.
470 } else if (thread->thread_state() == _thread_in_vm &&
471 sig == SIGBUS && thread->doing_unsafe_access()) {
472 // We don't really need a stub here! Just set the pending exeption and
473 // continue at the next instruction after the faulting read. Returning
474 // garbage from this read is ok.
475 thread->set_pending_unsafe_access_error();
476 os::Linux::ucontext_set_pc(uc, pc + Assembler::instr_len(pc));
477 return true;
478 }
479 }
480
481 // Check to see if we caught the safepoint code in the
482 // process of write protecting the memory serialization page.
483 // It write enables the page immediately after protecting it
484 // so we can just return to retry the write.
485 // Info->si_addr need not be the exact address, it is only
486 // guaranteed to be on the same page as the address that caused
487 // the SIGSEGV.
488 if ((sig == SIGSEGV) && !UseMembar &&
489 (os::get_memory_serialize_page() ==
490 (address)((uintptr_t)info->si_addr & ~(os::vm_page_size()-1)))) {
491 return true;
492 }
493 }
494
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::Linux::ucontext_set_pc(uc, stub);
499 return true;
500 }
501
502 // signal-chaining
503 if (os::Linux::chained_handler(sig, info, ucVoid)) {
504 return true;
505 }
506
507 if (!abort_if_unrecognized) {
508 // caller wants another chance, so give it to him
509 return false;
510 }
511
512 if (pc == NULL && uc != NULL) {
513 pc = os::Linux::ucontext_get_pc(uc);
514 }
515
516 // unmask current signal
517 sigset_t newset;
518 sigemptyset(&newset);
519 sigaddset(&newset, sig);
520 sigprocmask(SIG_UNBLOCK, &newset, NULL);
521
522 // Hand down correct pc for SIGILL, SIGFPE. pc from context
523 // usually points to the instruction after the failing instruction.
524 // Note: this should be combined with the trap_pc handling above,
525 // because it handles the same issue.
526 if (sig == SIGILL || sig == SIGFPE) {
527 pc = (address)info->si_addr;
528 }
529
530 VMError::report_and_die(t, sig, pc, info, ucVoid);
531
532 ShouldNotReachHere();
533 return false;
534 }
535
536 void os::Linux::init_thread_fpu_state(void) {
537 // Nothing to do on z/Architecture.
538 }
539
540 int os::Linux::get_fpu_control_word(void) {
541 // Nothing to do on z/Architecture.
542 return 0;
543 }
544
545 void os::Linux::set_fpu_control_word(int fpu_control) {
546 // Nothing to do on z/Architecture.
547 }
548
549 ////////////////////////////////////////////////////////////////////////////////
550 // thread stack
551
552 // Minimum usable stack sizes required to get to user code. Space for
553 // HotSpot guard pages is added later.
554 size_t os::Posix::_compiler_thread_min_stack_allowed = (52 DEBUG_ONLY(+ 32)) * K;
555 size_t os::Posix::_java_thread_min_stack_allowed = (32 DEBUG_ONLY(+ 8)) * K;
556 size_t os::Posix::_vm_internal_thread_min_stack_allowed = 32 * K;
557
558 // Return default stack size for thr_type.
559 size_t os::Posix::default_stack_size(os::ThreadType thr_type) {
560 // Default stack size (compiler thread needs larger stack).
561 size_t s = (thr_type == os::compiler_thread ? 4 * M : 1024 * K);
562 return s;
563 }
564
565 /////////////////////////////////////////////////////////////////////////////
566 // helper functions for fatal error handler
567
568 void os::print_context(outputStream *st, const void *context) {
569 if (context == NULL) return;
570
571 const ucontext_t* uc = (const ucontext_t*)context;
572
573 st->print_cr("Processor state:");
574 st->print_cr("----------------");
575 st->print_cr(" ip = " INTPTR_FORMAT " ", uc->uc_mcontext.psw.addr);
576 st->print_cr(" proc mask = " INTPTR_FORMAT " ", uc->uc_mcontext.psw.mask);
577 st->print_cr(" fpc reg = 0x%8.8x " , uc->uc_mcontext.fpregs.fpc);
578 st->cr();
579
580 st->print_cr("General Purpose Registers:");
581 st->print_cr("--------------------------");
582 for( int i = 0; i < 16; i+=2 ) {
583 st->print(" r%-2d = " INTPTR_FORMAT " " , i, uc->uc_mcontext.gregs[i]);
584 st->print(" r%-2d = " INTPTR_FORMAT " |", i+1, uc->uc_mcontext.gregs[i+1]);
585 st->print(" r%-2d = %23.1ld " , i, uc->uc_mcontext.gregs[i]);
586 st->print(" r%-2d = %23.1ld " , i+1, uc->uc_mcontext.gregs[i+1]);
587 st->cr();
588 }
589 st->cr();
590
591 st->print_cr("Access Registers:");
592 st->print_cr("-----------------");
593 for( int i = 0; i < 16; i+=2 ) {
594 st->print(" ar%-2d = 0x%8.8x ", i, uc->uc_mcontext.aregs[i]);
595 st->print(" ar%-2d = 0x%8.8x ", i+1, uc->uc_mcontext.aregs[i+1]);
596 st->cr();
597 }
598 st->cr();
599
600 st->print_cr("Float Registers:");
601 st->print_cr("----------------");
602 for (int i = 0; i < 16; i += 2) {
603 st->print(" fr%-2d = " INTPTR_FORMAT " " , i, (int64_t)(uc->uc_mcontext.fpregs.fprs[i].d));
604 st->print(" fr%-2d = " INTPTR_FORMAT " |", i+1, (int64_t)(uc->uc_mcontext.fpregs.fprs[i+1].d));
605 st->print(" fr%-2d = %23.15e " , i, (uc->uc_mcontext.fpregs.fprs[i].d));
606 st->print(" fr%-2d = %23.15e " , i+1, (uc->uc_mcontext.fpregs.fprs[i+1].d));
607 st->cr();
608 }
609 st->cr();
610 st->cr();
611
612 intptr_t *sp = (intptr_t *)os::Linux::ucontext_get_sp(uc);
613 st->print_cr("Top of Stack: (sp=" PTR_FORMAT ")", p2i(sp));
614 print_hex_dump(st, (address)sp, (address)(sp + 128), sizeof(intptr_t));
615 st->cr();
616
617 // Note: it may be unsafe to inspect memory near pc. For example, pc may
618 // point to garbage if entry point in an nmethod is corrupted. Leave
619 // this at the end, and hope for the best.
620 address pc = os::Linux::ucontext_get_pc(uc);
621 if (Verbose) { st->print_cr("pc at " PTR_FORMAT, p2i(pc)); }
622 st->print_cr("Instructions: (pc=" PTR_FORMAT ")", p2i(pc));
623 print_hex_dump(st, pc-64, pc+64, /*intrsize=*/4);
624 st->cr();
625 }
626
627 void os::print_register_info(outputStream *st, const void *context) {
628 if (context == NULL) return;
629
630 const ucontext_t *uc = (const ucontext_t*)context;
631
632 st->print_cr("Register to memory mapping:");
633 st->cr();
634
635 st->print("pc ="); print_location(st, (intptr_t)uc->uc_mcontext.psw.addr);
636 for (int i = 0; i < 16; i++) {
637 st->print("r%-2d=", i);
638 print_location(st, uc->uc_mcontext.gregs[i]);
639 }
640 st->cr();
641 }
642
643 #ifndef PRODUCT
644 void os::verify_stack_alignment() {
645 }
646 #endif
647
648 int os::extra_bang_size_in_bytes() {
649 // z/Architecture does not require the additional stack bang.
650 return 0;
651 }