1 /*
2 * Copyright (c) 1999, 2015, Oracle and/or its affiliates. All rights reserved.
3 * Copyright (c) 2014, Red Hat Inc. 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 "asm/macroAssembler.hpp"
28 #include "classfile/classLoader.hpp"
29 #include "classfile/systemDictionary.hpp"
30 #include "classfile/vmSymbols.hpp"
31 #include "code/icBuffer.hpp"
32 #include "code/vtableStubs.hpp"
33 #include "code/nativeInst.hpp"
34 #include "interpreter/interpreter.hpp"
35 #include "jvm_linux.h"
36 #include "memory/allocation.inline.hpp"
37 #include "mutex_linux.inline.hpp"
38 #include "os_share_linux.hpp"
39 #include "prims/jniFastGetField.hpp"
40 #include "prims/jvm.h"
41 #include "prims/jvm_misc.hpp"
42 #include "runtime/arguments.hpp"
43 #include "runtime/extendedPC.hpp"
44 #include "runtime/frame.inline.hpp"
45 #include "runtime/interfaceSupport.hpp"
46 #include "runtime/java.hpp"
47 #include "runtime/javaCalls.hpp"
48 #include "runtime/mutexLocker.hpp"
49 #include "runtime/osThread.hpp"
50 #include "runtime/sharedRuntime.hpp"
51 #include "runtime/stubRoutines.hpp"
52 #include "runtime/thread.inline.hpp"
53 #include "runtime/timer.hpp"
54 #include "utilities/events.hpp"
55 #include "utilities/vmError.hpp"
56 #ifdef BUILTIN_SIM
57 #include "../../../../../../simulator/simulator.hpp"
58 #endif
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 # include <fpu_control.h>
81
82 #ifdef BUILTIN_SIM
83 #define REG_SP REG_RSP
84 #define REG_PC REG_RIP
85 #define REG_FP REG_RBP
86 #define SPELL_REG_SP "rsp"
87 #define SPELL_REG_FP "rbp"
88 #else
89 #define REG_FP 29
90
91 #define SPELL_REG_SP "sp"
92 #define SPELL_REG_FP "x29"
93 #endif
94
95 address os::current_stack_pointer() {
96 register void *esp __asm__ (SPELL_REG_SP);
97 return (address) esp;
98 }
99
100 char* os::non_memory_address_word() {
101 // Must never look like an address returned by reserve_memory,
102 // even in its subfields (as defined by the CPU immediate fields,
103 // if the CPU splits constants across multiple instructions).
104
105 return (char*) 0xffffffffffff;
106 }
107
108 void os::initialize_thread(Thread *thr) {
109 }
110
111 address os::Linux::ucontext_get_pc(ucontext_t * uc) {
112 #ifdef BUILTIN_SIM
113 return (address)uc->uc_mcontext.gregs[REG_PC];
114 #else
115 return (address)uc->uc_mcontext.pc;
116 #endif
117 }
118
119 void os::Linux::ucontext_set_pc(ucontext_t * uc, address pc) {
120 #ifdef BUILTIN_SIM
121 uc->uc_mcontext.gregs[REG_PC] = (intptr_t)pc;
122 #else
123 uc->uc_mcontext.pc = (intptr_t)pc;
124 #endif
125 }
126
127 intptr_t* os::Linux::ucontext_get_sp(ucontext_t * uc) {
128 #ifdef BUILTIN_SIM
129 return (intptr_t*)uc->uc_mcontext.gregs[REG_SP];
130 #else
131 return (intptr_t*)uc->uc_mcontext.sp;
132 #endif
133 }
134
135 intptr_t* os::Linux::ucontext_get_fp(ucontext_t * uc) {
136 #ifdef BUILTIN_SIM
137 return (intptr_t*)uc->uc_mcontext.gregs[REG_FP];
138 #else
139 return (intptr_t*)uc->uc_mcontext.regs[REG_FP];
140 #endif
141 }
142
143 // For Forte Analyzer AsyncGetCallTrace profiling support - thread
144 // is currently interrupted by SIGPROF.
145 // os::Solaris::fetch_frame_from_ucontext() tries to skip nested signal
146 // frames. Currently we don't do that on Linux, so it's the same as
147 // os::fetch_frame_from_context().
148 ExtendedPC os::Linux::fetch_frame_from_ucontext(Thread* thread,
149 ucontext_t* uc, intptr_t** ret_sp, intptr_t** ret_fp) {
150
151 assert(thread != NULL, "just checking");
152 assert(ret_sp != NULL, "just checking");
153 assert(ret_fp != NULL, "just checking");
154
155 return os::fetch_frame_from_context(uc, ret_sp, ret_fp);
156 }
157
158 ExtendedPC os::fetch_frame_from_context(void* ucVoid,
159 intptr_t** ret_sp, intptr_t** ret_fp) {
160
161 ExtendedPC epc;
162 ucontext_t* uc = (ucontext_t*)ucVoid;
163
164 if (uc != NULL) {
165 epc = ExtendedPC(os::Linux::ucontext_get_pc(uc));
166 if (ret_sp) *ret_sp = os::Linux::ucontext_get_sp(uc);
167 if (ret_fp) *ret_fp = os::Linux::ucontext_get_fp(uc);
168 } else {
169 // construct empty ExtendedPC for return value checking
170 epc = ExtendedPC(NULL);
171 if (ret_sp) *ret_sp = (intptr_t *)NULL;
172 if (ret_fp) *ret_fp = (intptr_t *)NULL;
173 }
174
175 return epc;
176 }
177
178 frame os::fetch_frame_from_context(void* ucVoid) {
179 intptr_t* sp;
180 intptr_t* fp;
181 ExtendedPC epc = fetch_frame_from_context(ucVoid, &sp, &fp);
182 return frame(sp, fp, epc.pc());
183 }
184
185 // By default, gcc always saves frame pointer rfp on this stack. This
186 // may get turned off by -fomit-frame-pointer.
187 frame os::get_sender_for_C_frame(frame* fr) {
188 #ifdef BUILTIN_SIM
189 return frame(fr->sender_sp(), fr->link(), fr->sender_pc());
190 #else
191 return frame(fr->link(), fr->link(), fr->sender_pc());
192 #endif
193 }
194
195 intptr_t* _get_previous_fp() {
196 register intptr_t **ebp __asm__ (SPELL_REG_FP);
197 return (intptr_t*) *ebp; // we want what it points to.
198 }
199
200
201 frame os::current_frame() {
202 intptr_t* fp = _get_previous_fp();
203 frame myframe((intptr_t*)os::current_stack_pointer(),
204 (intptr_t*)fp,
205 CAST_FROM_FN_PTR(address, os::current_frame));
206 if (os::is_first_C_frame(&myframe)) {
207 // stack is not walkable
208 return frame();
209 } else {
210 return os::get_sender_for_C_frame(&myframe);
211 }
212 }
213
214 // Utility functions
215
216 // From IA32 System Programming Guide
217 enum {
218 trap_page_fault = 0xE
219 };
220
221 #ifdef BUILTIN_SIM
222 extern "C" void Fetch32PFI () ;
223 extern "C" void Fetch32Resume () ;
224 extern "C" void FetchNPFI () ;
225 extern "C" void FetchNResume () ;
226 #endif
227
228 // An operation in Unsafe has faulted. We're going to return to the
229 // instruction after the faulting load or store. We also set
230 // pending_unsafe_access_error so that at some point in the future our
231 // user will get a helpful message.
232 static address handle_unsafe_access(JavaThread* thread, address pc) {
233 // pc is the instruction which we must emulate
234 // doing a no-op is fine: return garbage from the load
235 // therefore, compute npc
236 address npc = pc + NativeCall::instruction_size;
237
238 // request an async exception
239 thread->set_pending_unsafe_access_error();
240
241 // return address of next instruction to execute
242 return npc;
243 }
244
245 extern "C" JNIEXPORT int
246 JVM_handle_linux_signal(int sig,
247 siginfo_t* info,
248 void* ucVoid,
249 int abort_if_unrecognized) {
250 ucontext_t* uc = (ucontext_t*) ucVoid;
251
252 Thread* t = ThreadLocalStorage::get_thread_slow();
253
254 // Must do this before SignalHandlerMark, if crash protection installed we will longjmp away
255 // (no destructors can be run)
256 os::WatcherThreadCrashProtection::check_crash_protection(sig, t);
257
258 SignalHandlerMark shm(t);
259
260 // Note: it's not uncommon that JNI code uses signal/sigset to install
261 // then restore certain signal handler (e.g. to temporarily block SIGPIPE,
262 // or have a SIGILL handler when detecting CPU type). When that happens,
263 // JVM_handle_linux_signal() might be invoked with junk info/ucVoid. To
264 // avoid unnecessary crash when libjsig is not preloaded, try handle signals
265 // that do not require siginfo/ucontext first.
266
267 if (sig == SIGPIPE || sig == SIGXFSZ) {
268 // allow chained handler to go first
269 if (os::Linux::chained_handler(sig, info, ucVoid)) {
270 return true;
271 } else {
272 if (PrintMiscellaneous && (WizardMode || Verbose)) {
273 char buf[64];
274 warning("Ignoring %s - see bugs 4229104 or 646499219",
275 os::exception_name(sig, buf, sizeof(buf)));
276 }
277 return true;
278 }
279 }
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 }
288 else if(t->is_VM_thread()){
289 vmthread = (VMThread *)t;
290 }
291 }
292 }
293 /*
294 NOTE: does not seem to work on linux.
295 if (info == NULL || info->si_code <= 0 || info->si_code == SI_NOINFO) {
296 // can't decode this kind of signal
297 info = NULL;
298 } else {
299 assert(sig == info->si_signo, "bad siginfo");
300 }
301 */
302 // decide if this trap can be handled by a stub
303 address stub = NULL;
304
305 address pc = NULL;
306
307 //%note os_trap_1
308 if (info != NULL && uc != NULL && thread != NULL) {
309 pc = (address) os::Linux::ucontext_get_pc(uc);
310
311 #ifdef BUILTIN_SIM
312 if (pc == (address) Fetch32PFI) {
313 uc->uc_mcontext.gregs[REG_PC] = intptr_t(Fetch32Resume) ;
314 return 1 ;
315 }
316 if (pc == (address) FetchNPFI) {
317 uc->uc_mcontext.gregs[REG_PC] = intptr_t (FetchNResume) ;
318 return 1 ;
319 }
320 #else
321 if (StubRoutines::is_safefetch_fault(pc)) {
322 os::Linux::ucontext_set_pc(uc, StubRoutines::continuation_for_safefetch_fault(pc));
323 return 1;
324 }
325 #endif
326
327 // Handle ALL stack overflow variations here
328 if (sig == SIGSEGV) {
329 address addr = (address) info->si_addr;
330
331 // check if fault address is within thread stack
332 if (addr < thread->stack_base() &&
333 addr >= thread->stack_base() - thread->stack_size()) {
334 // stack overflow
335 if (thread->in_stack_yellow_zone(addr)) {
336 thread->disable_stack_yellow_zone();
337 if (thread->thread_state() == _thread_in_Java) {
338 // Throw a stack overflow exception. Guard pages will be reenabled
339 // while unwinding the stack.
340 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW);
341 } else {
342 // Thread was in the vm or native code. Return and try to finish.
343 return 1;
344 }
345 } else if (thread->in_stack_red_zone(addr)) {
346 // Fatal red zone violation. Disable the guard pages and fall through
347 // to handle_unexpected_exception way down below.
348 thread->disable_stack_red_zone();
349 tty->print_raw_cr("An irrecoverable stack overflow has occurred.");
350
351 // This is a likely cause, but hard to verify. Let's just print
352 // it as a hint.
353 tty->print_raw_cr("Please check if any of your loaded .so files has "
354 "enabled executable stack (see man page execstack(8))");
355 } else {
356 // Accessing stack address below sp may cause SEGV if current
357 // thread has MAP_GROWSDOWN stack. This should only happen when
358 // current thread was created by user code with MAP_GROWSDOWN flag
359 // and then attached to VM. See notes in os_linux.cpp.
360 if (thread->osthread()->expanding_stack() == 0) {
361 thread->osthread()->set_expanding_stack();
362 if (os::Linux::manually_expand_stack(thread, addr)) {
363 thread->osthread()->clear_expanding_stack();
364 return 1;
365 }
366 thread->osthread()->clear_expanding_stack();
367 } else {
368 fatal("recursive segv. expanding stack.");
369 }
370 }
371 }
372 }
373
374 if (thread->thread_state() == _thread_in_Java) {
375 // Java thread running in Java code => find exception handler if any
376 // a fault inside compiled code, the interpreter, or a stub
377
378 // Handle signal from NativeJump::patch_verified_entry().
379 if ((sig == SIGILL || sig == SIGTRAP)
380 && nativeInstruction_at(pc)->is_sigill_zombie_not_entrant()) {
381 if (TraceTraps) {
382 tty->print_cr("trap: zombie_not_entrant (%s)", (sig == SIGTRAP) ? "SIGTRAP" : "SIGILL");
383 }
384 stub = SharedRuntime::get_handle_wrong_method_stub();
385 } else if (sig == SIGSEGV && os::is_poll_address((address)info->si_addr)) {
386 stub = SharedRuntime::get_poll_stub(pc);
387 } else if (sig == SIGBUS /* && info->si_code == BUS_OBJERR */) {
388 // BugId 4454115: A read from a MappedByteBuffer can fault
389 // here if the underlying file has been truncated.
390 // Do not crash the VM in such a case.
391 CodeBlob* cb = CodeCache::find_blob_unsafe(pc);
392 nmethod* nm = (cb != NULL && cb->is_nmethod()) ? (nmethod*)cb : NULL;
393 if (nm != NULL && nm->has_unsafe_access()) {
394 stub = handle_unsafe_access(thread, pc);
395 }
396 }
397 else
398
399 if (sig == SIGFPE &&
400 (info->si_code == FPE_INTDIV || info->si_code == FPE_FLTDIV)) {
401 stub =
402 SharedRuntime::
403 continuation_for_implicit_exception(thread,
404 pc,
405 SharedRuntime::
406 IMPLICIT_DIVIDE_BY_ZERO);
407 } else if (sig == SIGSEGV &&
408 !MacroAssembler::needs_explicit_null_check((intptr_t)info->si_addr)) {
409 // Determination of interpreter/vtable stub/compiled code null exception
410 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
411 }
412 } else if (thread->thread_state() == _thread_in_vm &&
413 sig == SIGBUS && /* info->si_code == BUS_OBJERR && */
414 thread->doing_unsafe_access()) {
415 stub = handle_unsafe_access(thread, pc);
416 }
417
418 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in
419 // and the heap gets shrunk before the field access.
420 if ((sig == SIGSEGV) || (sig == SIGBUS)) {
421 address addr = JNI_FastGetField::find_slowcase_pc(pc);
422 if (addr != (address)-1) {
423 stub = addr;
424 }
425 }
426
427 // Check to see if we caught the safepoint code in the
428 // process of write protecting the memory serialization page.
429 // It write enables the page immediately after protecting it
430 // so we can just return to retry the write.
431 if ((sig == SIGSEGV) &&
432 os::is_memory_serialize_page(thread, (address) info->si_addr)) {
433 // Block current thread until the memory serialize page permission restored.
434 os::block_on_serialize_page_trap();
435 return true;
436 }
437 }
438
439 if (stub != NULL) {
440 // save all thread context in case we need to restore it
441 if (thread != NULL) thread->set_saved_exception_pc(pc);
442
443 os::Linux::ucontext_set_pc(uc, stub);
444 return true;
445 }
446
447 // signal-chaining
448 if (os::Linux::chained_handler(sig, info, ucVoid)) {
449 return true;
450 }
451
452 if (!abort_if_unrecognized) {
453 // caller wants another chance, so give it to him
454 return false;
455 }
456
457 if (pc == NULL && uc != NULL) {
458 pc = os::Linux::ucontext_get_pc(uc);
459 }
460
461 // unmask current signal
462 sigset_t newset;
463 sigemptyset(&newset);
464 sigaddset(&newset, sig);
465 sigprocmask(SIG_UNBLOCK, &newset, NULL);
466
467 VMError err(t, sig, pc, info, ucVoid);
468 err.report_and_die();
469
470 ShouldNotReachHere();
471 return true; // Mute compiler
472 }
473
474 void os::Linux::init_thread_fpu_state(void) {
475 }
476
477 int os::Linux::get_fpu_control_word(void) {
478 return 0;
479 }
480
481 void os::Linux::set_fpu_control_word(int fpu_control) {
482 }
483
484 // Check that the linux kernel version is 2.4 or higher since earlier
485 // versions do not support SSE without patches.
486 bool os::supports_sse() {
487 return true;
488 }
489
490 bool os::is_allocatable(size_t bytes) {
491 return true;
492 }
493
494 ////////////////////////////////////////////////////////////////////////////////
495 // thread stack
496
497 size_t os::Linux::min_stack_allowed = 64 * K;
498
499 // return default stack size for thr_type
500 size_t os::Linux::default_stack_size(os::ThreadType thr_type) {
501 // default stack size (compiler thread needs larger stack)
502 size_t s = (thr_type == os::compiler_thread ? 4 * M : 1 * M);
503 return s;
504 }
505
506 size_t os::Linux::default_guard_size(os::ThreadType thr_type) {
507 // Creating guard page is very expensive. Java thread has HotSpot
508 // guard page, only enable glibc guard page for non-Java threads.
509 return (thr_type == java_thread ? 0 : page_size());
510 }
511
512 // Java thread:
513 //
514 // Low memory addresses
515 // +------------------------+
516 // | |\ JavaThread created by VM does not have glibc
517 // | glibc guard page | - guard, attached Java thread usually has
518 // | |/ 1 page glibc guard.
519 // P1 +------------------------+ Thread::stack_base() - Thread::stack_size()
520 // | |\
521 // | HotSpot Guard Pages | - red and yellow pages
522 // | |/
523 // +------------------------+ JavaThread::stack_yellow_zone_base()
524 // | |\
525 // | Normal Stack | -
526 // | |/
527 // P2 +------------------------+ Thread::stack_base()
528 //
529 // Non-Java thread:
530 //
531 // Low memory addresses
532 // +------------------------+
533 // | |\
534 // | glibc guard page | - usually 1 page
535 // | |/
536 // P1 +------------------------+ Thread::stack_base() - Thread::stack_size()
537 // | |\
538 // | Normal Stack | -
539 // | |/
540 // P2 +------------------------+ Thread::stack_base()
541 //
542 // ** P1 (aka bottom) and size ( P2 = P1 - size) are the address and stack size returned from
543 // pthread_attr_getstack()
544
545 static void current_stack_region(address * bottom, size_t * size) {
546 if (os::Linux::is_initial_thread()) {
547 // initial thread needs special handling because pthread_getattr_np()
548 // may return bogus value.
549 *bottom = os::Linux::initial_thread_stack_bottom();
550 *size = os::Linux::initial_thread_stack_size();
551 } else {
552 pthread_attr_t attr;
553
554 int rslt = pthread_getattr_np(pthread_self(), &attr);
555
556 // JVM needs to know exact stack location, abort if it fails
557 if (rslt != 0) {
558 if (rslt == ENOMEM) {
559 vm_exit_out_of_memory(0, OOM_MMAP_ERROR, "pthread_getattr_np");
560 } else {
561 fatal(err_msg("pthread_getattr_np failed with errno = %d", rslt));
562 }
563 }
564
565 if (pthread_attr_getstack(&attr, (void **)bottom, size) != 0) {
566 fatal("Can not locate current stack attributes!");
567 }
568
569 pthread_attr_destroy(&attr);
570
571 }
572 assert(os::current_stack_pointer() >= *bottom &&
573 os::current_stack_pointer() < *bottom + *size, "just checking");
574 }
575
576 address os::current_stack_base() {
577 address bottom;
578 size_t size;
579 current_stack_region(&bottom, &size);
580 return (bottom + size);
581 }
582
583 size_t os::current_stack_size() {
584 // stack size includes normal stack and HotSpot guard pages
585 address bottom;
586 size_t size;
587 current_stack_region(&bottom, &size);
588 return size;
589 }
590
591 /////////////////////////////////////////////////////////////////////////////
592 // helper functions for fatal error handler
593
594 void os::print_context(outputStream *st, void *context) {
595 if (context == NULL) return;
596
597 ucontext_t *uc = (ucontext_t*)context;
598 st->print_cr("Registers:");
599 #ifdef BUILTIN_SIM
600 st->print( "RAX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RAX]);
601 st->print(", RBX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RBX]);
602 st->print(", RCX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RCX]);
603 st->print(", RDX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RDX]);
604 st->cr();
605 st->print( "RSP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RSP]);
606 st->print(", RBP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RBP]);
607 st->print(", RSI=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RSI]);
608 st->print(", RDI=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RDI]);
609 st->cr();
610 st->print( "R8 =" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R8]);
611 st->print(", R9 =" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R9]);
612 st->print(", R10=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R10]);
613 st->print(", R11=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R11]);
614 st->cr();
615 st->print( "R12=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R12]);
616 st->print(", R13=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R13]);
617 st->print(", R14=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R14]);
618 st->print(", R15=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R15]);
619 st->cr();
620 st->print( "RIP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RIP]);
621 st->print(", EFLAGS=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_EFL]);
622 st->print(", CSGSFS=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_CSGSFS]);
623 st->print(", ERR=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_ERR]);
624 st->cr();
625 st->print(" TRAPNO=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_TRAPNO]);
626 st->cr();
627 #else
628 for (int r = 0; r < 31; r++)
629 st->print_cr( "R%d=" INTPTR_FORMAT, r, (size_t)uc->uc_mcontext.regs[r]);
630 #endif
631 st->cr();
632
633 intptr_t *sp = (intptr_t *)os::Linux::ucontext_get_sp(uc);
634 st->print_cr("Top of Stack: (sp=" PTR_FORMAT ")", p2i(sp));
635 print_hex_dump(st, (address)sp, (address)(sp + 8*sizeof(intptr_t)), sizeof(intptr_t));
636 st->cr();
637
638 // Note: it may be unsafe to inspect memory near pc. For example, pc may
639 // point to garbage if entry point in an nmethod is corrupted. Leave
640 // this at the end, and hope for the best.
641 address pc = os::Linux::ucontext_get_pc(uc);
642 st->print_cr("Instructions: (pc=" PTR_FORMAT ")", p2i(pc));
643 print_hex_dump(st, pc - 32, pc + 32, sizeof(char));
644 }
645
646 void os::print_register_info(outputStream *st, void *context) {
647 if (context == NULL) return;
648
649 ucontext_t *uc = (ucontext_t*)context;
650
651 st->print_cr("Register to memory mapping:");
652 st->cr();
653
654 // this is horrendously verbose but the layout of the registers in the
655 // context does not match how we defined our abstract Register set, so
656 // we can't just iterate through the gregs area
657
658 // this is only for the "general purpose" registers
659
660 #ifdef BUILTIN_SIM
661 st->print("RAX="); print_location(st, uc->uc_mcontext.gregs[REG_RAX]);
662 st->print("RBX="); print_location(st, uc->uc_mcontext.gregs[REG_RBX]);
663 st->print("RCX="); print_location(st, uc->uc_mcontext.gregs[REG_RCX]);
664 st->print("RDX="); print_location(st, uc->uc_mcontext.gregs[REG_RDX]);
665 st->print("RSP="); print_location(st, uc->uc_mcontext.gregs[REG_RSP]);
666 st->print("RBP="); print_location(st, uc->uc_mcontext.gregs[REG_RBP]);
667 st->print("RSI="); print_location(st, uc->uc_mcontext.gregs[REG_RSI]);
668 st->print("RDI="); print_location(st, uc->uc_mcontext.gregs[REG_RDI]);
669 st->print("R8 ="); print_location(st, uc->uc_mcontext.gregs[REG_R8]);
670 st->print("R9 ="); print_location(st, uc->uc_mcontext.gregs[REG_R9]);
671 st->print("R10="); print_location(st, uc->uc_mcontext.gregs[REG_R10]);
672 st->print("R11="); print_location(st, uc->uc_mcontext.gregs[REG_R11]);
673 st->print("R12="); print_location(st, uc->uc_mcontext.gregs[REG_R12]);
674 st->print("R13="); print_location(st, uc->uc_mcontext.gregs[REG_R13]);
675 st->print("R14="); print_location(st, uc->uc_mcontext.gregs[REG_R14]);
676 st->print("R15="); print_location(st, uc->uc_mcontext.gregs[REG_R15]);
677 #else
678 for (int r = 0; r < 31; r++)
679 st->print_cr( "R%d=" INTPTR_FORMAT, r, (uintptr_t)uc->uc_mcontext.regs[r]);
680 #endif
681 st->cr();
682 }
683
684 void os::setup_fpu() {
685 }
686
687 #ifndef PRODUCT
688 void os::verify_stack_alignment() {
689 assert(((intptr_t)os::current_stack_pointer() & (StackAlignmentInBytes-1)) == 0, "incorrect stack alignment");
690 }
691 #endif
692
693 int os::extra_bang_size_in_bytes() {
694 // AArch64 does not require the additional stack bang.
695 return 0;
696 }
697
698 extern "C" {
699 int SpinPause() {
700 return 0;
701 }
702
703 void _Copy_conjoint_jshorts_atomic(jshort* from, jshort* to, size_t count) {
704 if (from > to) {
705 jshort *end = from + count;
706 while (from < end)
707 *(to++) = *(from++);
708 }
709 else if (from < to) {
710 jshort *end = from;
711 from += count - 1;
712 to += count - 1;
713 while (from >= end)
714 *(to--) = *(from--);
715 }
716 }
717 void _Copy_conjoint_jints_atomic(jint* from, jint* to, size_t count) {
718 if (from > to) {
719 jint *end = from + count;
720 while (from < end)
721 *(to++) = *(from++);
722 }
723 else if (from < to) {
724 jint *end = from;
725 from += count - 1;
726 to += count - 1;
727 while (from >= end)
728 *(to--) = *(from--);
729 }
730 }
731 void _Copy_conjoint_jlongs_atomic(jlong* from, jlong* to, size_t count) {
732 if (from > to) {
733 jlong *end = from + count;
734 while (from < end)
735 os::atomic_copy64(from++, to++);
736 }
737 else if (from < to) {
738 jlong *end = from;
739 from += count - 1;
740 to += count - 1;
741 while (from >= end)
742 os::atomic_copy64(from--, to--);
743 }
744 }
745
746 void _Copy_arrayof_conjoint_bytes(HeapWord* from,
747 HeapWord* to,
748 size_t count) {
749 memmove(to, from, count);
750 }
751 void _Copy_arrayof_conjoint_jshorts(HeapWord* from,
752 HeapWord* to,
753 size_t count) {
754 memmove(to, from, count * 2);
755 }
756 void _Copy_arrayof_conjoint_jints(HeapWord* from,
757 HeapWord* to,
758 size_t count) {
759 memmove(to, from, count * 4);
760 }
761 void _Copy_arrayof_conjoint_jlongs(HeapWord* from,
762 HeapWord* to,
763 size_t count) {
764 memmove(to, from, count * 8);
765 }
766 };