Mon, 08 Dec 2008 15:50:55 -0500
6773838: There is no calling stack for Compiler thread in hs_err file on x86
Summary: On solaris, the inline assembly wasn't being processed. Added volatile to il file fixed it.
Reviewed-by: phh, kvn
1 /*
2 * Copyright 1999-2008 Sun Microsystems, Inc. All Rights Reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
25 // do not include precompiled header file
26 # include "incls/_os_solaris_x86.cpp.incl"
28 // put OS-includes here
29 # include <sys/types.h>
30 # include <sys/mman.h>
31 # include <pthread.h>
32 # include <signal.h>
33 # include <setjmp.h>
34 # include <errno.h>
35 # include <dlfcn.h>
36 # include <stdio.h>
37 # include <unistd.h>
38 # include <sys/resource.h>
39 # include <thread.h>
40 # include <sys/stat.h>
41 # include <sys/time.h>
42 # include <sys/filio.h>
43 # include <sys/utsname.h>
44 # include <sys/systeminfo.h>
45 # include <sys/socket.h>
46 # include <sys/trap.h>
47 # include <sys/lwp.h>
48 # include <pwd.h>
49 # include <poll.h>
50 # include <sys/lwp.h>
51 # include <procfs.h> // see comment in <sys/procfs.h>
53 #ifndef AMD64
54 // QQQ seems useless at this point
55 # define _STRUCTURED_PROC 1 // this gets us the new structured proc interfaces of 5.6 & later
56 #endif // AMD64
57 # include <sys/procfs.h> // see comment in <sys/procfs.h>
60 #define MAX_PATH (2 * K)
62 // Minimum stack size for the VM. It's easier to document a constant value
63 // but it's different for x86 and sparc because the page sizes are different.
64 #ifdef AMD64
65 size_t os::Solaris::min_stack_allowed = 224*K;
66 #define REG_SP REG_RSP
67 #define REG_PC REG_RIP
68 #define REG_FP REG_RBP
69 #else
70 size_t os::Solaris::min_stack_allowed = 64*K;
71 #define REG_SP UESP
72 #define REG_PC EIP
73 #define REG_FP EBP
74 // 4900493 counter to prevent runaway LDTR refresh attempt
76 static volatile int ldtr_refresh = 0;
77 // the libthread instruction that faults because of the stale LDTR
79 static const unsigned char movlfs[] = { 0x8e, 0xe0 // movl %eax,%fs
80 };
81 #endif // AMD64
83 char* os::non_memory_address_word() {
84 // Must never look like an address returned by reserve_memory,
85 // even in its subfields (as defined by the CPU immediate fields,
86 // if the CPU splits constants across multiple instructions).
87 return (char*) -1;
88 }
90 //
91 // Validate a ucontext retrieved from walking a uc_link of a ucontext.
92 // There are issues with libthread giving out uc_links for different threads
93 // on the same uc_link chain and bad or circular links.
94 //
95 bool os::Solaris::valid_ucontext(Thread* thread, ucontext_t* valid, ucontext_t* suspect) {
96 if (valid >= suspect ||
97 valid->uc_stack.ss_flags != suspect->uc_stack.ss_flags ||
98 valid->uc_stack.ss_sp != suspect->uc_stack.ss_sp ||
99 valid->uc_stack.ss_size != suspect->uc_stack.ss_size) {
100 DEBUG_ONLY(tty->print_cr("valid_ucontext: failed test 1");)
101 return false;
102 }
104 if (thread->is_Java_thread()) {
105 if (!valid_stack_address(thread, (address)suspect)) {
106 DEBUG_ONLY(tty->print_cr("valid_ucontext: uc_link not in thread stack");)
107 return false;
108 }
109 if (!valid_stack_address(thread, (address) suspect->uc_mcontext.gregs[REG_SP])) {
110 DEBUG_ONLY(tty->print_cr("valid_ucontext: stackpointer not in thread stack");)
111 return false;
112 }
113 }
114 return true;
115 }
117 // We will only follow one level of uc_link since there are libthread
118 // issues with ucontext linking and it is better to be safe and just
119 // let caller retry later.
120 ucontext_t* os::Solaris::get_valid_uc_in_signal_handler(Thread *thread,
121 ucontext_t *uc) {
123 ucontext_t *retuc = NULL;
125 if (uc != NULL) {
126 if (uc->uc_link == NULL) {
127 // cannot validate without uc_link so accept current ucontext
128 retuc = uc;
129 } else if (os::Solaris::valid_ucontext(thread, uc, uc->uc_link)) {
130 // first ucontext is valid so try the next one
131 uc = uc->uc_link;
132 if (uc->uc_link == NULL) {
133 // cannot validate without uc_link so accept current ucontext
134 retuc = uc;
135 } else if (os::Solaris::valid_ucontext(thread, uc, uc->uc_link)) {
136 // the ucontext one level down is also valid so return it
137 retuc = uc;
138 }
139 }
140 }
141 return retuc;
142 }
144 // Assumes ucontext is valid
145 ExtendedPC os::Solaris::ucontext_get_ExtendedPC(ucontext_t *uc) {
146 return ExtendedPC((address)uc->uc_mcontext.gregs[REG_PC]);
147 }
149 // Assumes ucontext is valid
150 intptr_t* os::Solaris::ucontext_get_sp(ucontext_t *uc) {
151 return (intptr_t*)uc->uc_mcontext.gregs[REG_SP];
152 }
154 // Assumes ucontext is valid
155 intptr_t* os::Solaris::ucontext_get_fp(ucontext_t *uc) {
156 return (intptr_t*)uc->uc_mcontext.gregs[REG_FP];
157 }
159 // For Forte Analyzer AsyncGetCallTrace profiling support - thread
160 // is currently interrupted by SIGPROF.
161 //
162 // The difference between this and os::fetch_frame_from_context() is that
163 // here we try to skip nested signal frames.
164 ExtendedPC os::Solaris::fetch_frame_from_ucontext(Thread* thread,
165 ucontext_t* uc, intptr_t** ret_sp, intptr_t** ret_fp) {
167 assert(thread != NULL, "just checking");
168 assert(ret_sp != NULL, "just checking");
169 assert(ret_fp != NULL, "just checking");
171 ucontext_t *luc = os::Solaris::get_valid_uc_in_signal_handler(thread, uc);
172 return os::fetch_frame_from_context(luc, ret_sp, ret_fp);
173 }
175 ExtendedPC os::fetch_frame_from_context(void* ucVoid,
176 intptr_t** ret_sp, intptr_t** ret_fp) {
178 ExtendedPC epc;
179 ucontext_t *uc = (ucontext_t*)ucVoid;
181 if (uc != NULL) {
182 epc = os::Solaris::ucontext_get_ExtendedPC(uc);
183 if (ret_sp) *ret_sp = os::Solaris::ucontext_get_sp(uc);
184 if (ret_fp) *ret_fp = os::Solaris::ucontext_get_fp(uc);
185 } else {
186 // construct empty ExtendedPC for return value checking
187 epc = ExtendedPC(NULL);
188 if (ret_sp) *ret_sp = (intptr_t *)NULL;
189 if (ret_fp) *ret_fp = (intptr_t *)NULL;
190 }
192 return epc;
193 }
195 frame os::fetch_frame_from_context(void* ucVoid) {
196 intptr_t* sp;
197 intptr_t* fp;
198 ExtendedPC epc = fetch_frame_from_context(ucVoid, &sp, &fp);
199 return frame(sp, fp, epc.pc());
200 }
202 frame os::get_sender_for_C_frame(frame* fr) {
203 return frame(fr->sender_sp(), fr->link(), fr->sender_pc());
204 }
206 extern "C" intptr_t *_get_current_fp(); // in .il file
208 frame os::current_frame() {
209 intptr_t* fp = _get_current_fp(); // it's inlined so want current fp
210 frame myframe((intptr_t*)os::current_stack_pointer(),
211 (intptr_t*)fp,
212 CAST_FROM_FN_PTR(address, os::current_frame));
213 if (os::is_first_C_frame(&myframe)) {
214 // stack is not walkable
215 frame ret; // This will be a null useless frame
216 return ret;
217 } else {
218 return os::get_sender_for_C_frame(&myframe);
219 }
220 }
222 // This is a simple callback that just fetches a PC for an interrupted thread.
223 // The thread need not be suspended and the fetched PC is just a hint.
224 // This one is currently used for profiling the VMThread ONLY!
226 // Must be synchronous
227 void GetThreadPC_Callback::execute(OSThread::InterruptArguments *args) {
228 Thread* thread = args->thread();
229 ucontext_t* uc = args->ucontext();
230 intptr_t* sp;
232 assert(ProfileVM && thread->is_VM_thread(), "just checking");
234 ExtendedPC new_addr((address)uc->uc_mcontext.gregs[REG_PC]);
235 _addr = new_addr;
236 }
238 static int threadgetstate(thread_t tid, int *flags, lwpid_t *lwp, stack_t *ss, gregset_t rs, lwpstatus_t *lwpstatus) {
239 char lwpstatusfile[PROCFILE_LENGTH];
240 int lwpfd, err;
242 if (err = os::Solaris::thr_getstate(tid, flags, lwp, ss, rs))
243 return (err);
244 if (*flags == TRS_LWPID) {
245 sprintf(lwpstatusfile, "/proc/%d/lwp/%d/lwpstatus", getpid(),
246 *lwp);
247 if ((lwpfd = open(lwpstatusfile, O_RDONLY)) < 0) {
248 perror("thr_mutator_status: open lwpstatus");
249 return (EINVAL);
250 }
251 if (pread(lwpfd, lwpstatus, sizeof (lwpstatus_t), (off_t)0) !=
252 sizeof (lwpstatus_t)) {
253 perror("thr_mutator_status: read lwpstatus");
254 (void) close(lwpfd);
255 return (EINVAL);
256 }
257 (void) close(lwpfd);
258 }
259 return (0);
260 }
262 #ifndef AMD64
264 // Detecting SSE support by OS
265 // From solaris_i486.s
266 extern "C" bool sse_check();
267 extern "C" bool sse_unavailable();
269 enum { SSE_UNKNOWN, SSE_NOT_SUPPORTED, SSE_SUPPORTED};
270 static int sse_status = SSE_UNKNOWN;
273 static void check_for_sse_support() {
274 if (!VM_Version::supports_sse()) {
275 sse_status = SSE_NOT_SUPPORTED;
276 return;
277 }
278 // looking for _sse_hw in libc.so, if it does not exist or
279 // the value (int) is 0, OS has no support for SSE
280 int *sse_hwp;
281 void *h;
283 if ((h=dlopen("/usr/lib/libc.so", RTLD_LAZY)) == NULL) {
284 //open failed, presume no support for SSE
285 sse_status = SSE_NOT_SUPPORTED;
286 return;
287 }
288 if ((sse_hwp = (int *)dlsym(h, "_sse_hw")) == NULL) {
289 sse_status = SSE_NOT_SUPPORTED;
290 } else if (*sse_hwp == 0) {
291 sse_status = SSE_NOT_SUPPORTED;
292 }
293 dlclose(h);
295 if (sse_status == SSE_UNKNOWN) {
296 bool (*try_sse)() = (bool (*)())sse_check;
297 sse_status = (*try_sse)() ? SSE_SUPPORTED : SSE_NOT_SUPPORTED;
298 }
300 }
302 bool os::supports_sse() {
303 if (sse_status == SSE_UNKNOWN)
304 check_for_sse_support();
305 return sse_status == SSE_SUPPORTED;
306 }
308 #endif // AMD64
310 bool os::is_allocatable(size_t bytes) {
311 #ifdef AMD64
312 return true;
313 #else
315 if (bytes < 2 * G) {
316 return true;
317 }
319 char* addr = reserve_memory(bytes, NULL);
321 if (addr != NULL) {
322 release_memory(addr, bytes);
323 }
325 return addr != NULL;
326 #endif // AMD64
328 }
330 extern "C" int JVM_handle_solaris_signal(int signo, siginfo_t* siginfo, void* ucontext, int abort_if_unrecognized);
332 extern "C" void Fetch32PFI () ;
333 extern "C" void Fetch32Resume () ;
334 #ifdef AMD64
335 extern "C" void FetchNPFI () ;
336 extern "C" void FetchNResume () ;
337 #endif // AMD64
339 int JVM_handle_solaris_signal(int sig, siginfo_t* info, void* ucVoid, int abort_if_unrecognized) {
340 ucontext_t* uc = (ucontext_t*) ucVoid;
342 #ifndef AMD64
343 if (sig == SIGILL && info->si_addr == (caddr_t)sse_check) {
344 // the SSE instruction faulted. supports_sse() need return false.
345 uc->uc_mcontext.gregs[EIP] = (greg_t)sse_unavailable;
346 return true;
347 }
348 #endif // !AMD64
350 Thread* t = ThreadLocalStorage::get_thread_slow(); // slow & steady
352 SignalHandlerMark shm(t);
354 if(sig == SIGPIPE || sig == SIGXFSZ) {
355 if (os::Solaris::chained_handler(sig, info, ucVoid)) {
356 return true;
357 } else {
358 if (PrintMiscellaneous && (WizardMode || Verbose)) {
359 char buf[64];
360 warning("Ignoring %s - see 4229104 or 6499219",
361 os::exception_name(sig, buf, sizeof(buf)));
363 }
364 return true;
365 }
366 }
368 JavaThread* thread = NULL;
369 VMThread* vmthread = NULL;
371 if (os::Solaris::signal_handlers_are_installed) {
372 if (t != NULL ){
373 if(t->is_Java_thread()) {
374 thread = (JavaThread*)t;
375 }
376 else if(t->is_VM_thread()){
377 vmthread = (VMThread *)t;
378 }
379 }
380 }
382 guarantee(sig != os::Solaris::SIGinterrupt(), "Can not chain VM interrupt signal, try -XX:+UseAltSigs");
384 if (sig == os::Solaris::SIGasync()) {
385 if(thread){
386 OSThread::InterruptArguments args(thread, uc);
387 thread->osthread()->do_interrupt_callbacks_at_interrupt(&args);
388 return true;
389 }
390 else if(vmthread){
391 OSThread::InterruptArguments args(vmthread, uc);
392 vmthread->osthread()->do_interrupt_callbacks_at_interrupt(&args);
393 return true;
394 } else if (os::Solaris::chained_handler(sig, info, ucVoid)) {
395 return true;
396 } else {
397 // If os::Solaris::SIGasync not chained, and this is a non-vm and
398 // non-java thread
399 return true;
400 }
401 }
403 if (info == NULL || info->si_code <= 0 || info->si_code == SI_NOINFO) {
404 // can't decode this kind of signal
405 info = NULL;
406 } else {
407 assert(sig == info->si_signo, "bad siginfo");
408 }
410 // decide if this trap can be handled by a stub
411 address stub = NULL;
413 address pc = NULL;
415 //%note os_trap_1
416 if (info != NULL && uc != NULL && thread != NULL) {
417 // factor me: getPCfromContext
418 pc = (address) uc->uc_mcontext.gregs[REG_PC];
420 // SafeFetch32() support
421 if (pc == (address) Fetch32PFI) {
422 uc->uc_mcontext.gregs[REG_PC] = intptr_t(Fetch32Resume) ;
423 return true ;
424 }
425 #ifdef AMD64
426 if (pc == (address) FetchNPFI) {
427 uc->uc_mcontext.gregs [REG_PC] = intptr_t(FetchNResume) ;
428 return true ;
429 }
430 #endif // AMD64
432 // Handle ALL stack overflow variations here
433 if (sig == SIGSEGV && info->si_code == SEGV_ACCERR) {
434 address addr = (address) info->si_addr;
435 if (thread->in_stack_yellow_zone(addr)) {
436 thread->disable_stack_yellow_zone();
437 if (thread->thread_state() == _thread_in_Java) {
438 // Throw a stack overflow exception. Guard pages will be reenabled
439 // while unwinding the stack.
440 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW);
441 } else {
442 // Thread was in the vm or native code. Return and try to finish.
443 return true;
444 }
445 } else if (thread->in_stack_red_zone(addr)) {
446 // Fatal red zone violation. Disable the guard pages and fall through
447 // to handle_unexpected_exception way down below.
448 thread->disable_stack_red_zone();
449 tty->print_raw_cr("An irrecoverable stack overflow has occurred.");
450 }
451 }
453 if (thread->thread_state() == _thread_in_vm) {
454 if (sig == SIGBUS && info->si_code == BUS_OBJERR && thread->doing_unsafe_access()) {
455 stub = StubRoutines::handler_for_unsafe_access();
456 }
457 }
459 if (thread->thread_state() == _thread_in_Java) {
460 // Support Safepoint Polling
461 if ( sig == SIGSEGV && os::is_poll_address((address)info->si_addr)) {
462 stub = SharedRuntime::get_poll_stub(pc);
463 }
464 else if (sig == SIGBUS && info->si_code == BUS_OBJERR) {
465 // BugId 4454115: A read from a MappedByteBuffer can fault
466 // here if the underlying file has been truncated.
467 // Do not crash the VM in such a case.
468 CodeBlob* cb = CodeCache::find_blob_unsafe(pc);
469 nmethod* nm = cb->is_nmethod() ? (nmethod*)cb : NULL;
470 if (nm != NULL && nm->has_unsafe_access()) {
471 stub = StubRoutines::handler_for_unsafe_access();
472 }
473 }
474 else
475 if (sig == SIGFPE && info->si_code == FPE_INTDIV) {
476 // integer divide by zero
477 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO);
478 }
479 #ifndef AMD64
480 else if (sig == SIGFPE && info->si_code == FPE_FLTDIV) {
481 // floating-point divide by zero
482 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO);
483 }
484 else if (sig == SIGFPE && info->si_code == FPE_FLTINV) {
485 // The encoding of D2I in i486.ad can cause an exception prior
486 // to the fist instruction if there was an invalid operation
487 // pending. We want to dismiss that exception. From the win_32
488 // side it also seems that if it really was the fist causing
489 // the exception that we do the d2i by hand with different
490 // rounding. Seems kind of weird. QQQ TODO
491 // Note that we take the exception at the NEXT floating point instruction.
492 if (pc[0] == 0xDB) {
493 assert(pc[0] == 0xDB, "not a FIST opcode");
494 assert(pc[1] == 0x14, "not a FIST opcode");
495 assert(pc[2] == 0x24, "not a FIST opcode");
496 return true;
497 } else {
498 assert(pc[-3] == 0xDB, "not an flt invalid opcode");
499 assert(pc[-2] == 0x14, "not an flt invalid opcode");
500 assert(pc[-1] == 0x24, "not an flt invalid opcode");
501 }
502 }
503 else if (sig == SIGFPE ) {
504 tty->print_cr("caught SIGFPE, info 0x%x.", info->si_code);
505 }
506 #endif // !AMD64
508 // QQQ It doesn't seem that we need to do this on x86 because we should be able
509 // to return properly from the handler without this extra stuff on the back side.
511 else if (sig == SIGSEGV && info->si_code > 0 && !MacroAssembler::needs_explicit_null_check((intptr_t)info->si_addr)) {
512 // Determination of interpreter/vtable stub/compiled code null exception
513 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
514 }
515 }
517 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in
518 // and the heap gets shrunk before the field access.
519 if ((sig == SIGSEGV) || (sig == SIGBUS)) {
520 address addr = JNI_FastGetField::find_slowcase_pc(pc);
521 if (addr != (address)-1) {
522 stub = addr;
523 }
524 }
526 // Check to see if we caught the safepoint code in the
527 // process of write protecting the memory serialization page.
528 // It write enables the page immediately after protecting it
529 // so we can just return to retry the write.
530 if ((sig == SIGSEGV) &&
531 os::is_memory_serialize_page(thread, (address)info->si_addr)) {
532 // Block current thread until the memory serialize page permission restored.
533 os::block_on_serialize_page_trap();
534 return true;
535 }
536 }
538 // Execution protection violation
539 //
540 // Preventative code for future versions of Solaris which may
541 // enable execution protection when running the 32-bit VM on AMD64.
542 //
543 // This should be kept as the last step in the triage. We don't
544 // have a dedicated trap number for a no-execute fault, so be
545 // conservative and allow other handlers the first shot.
546 //
547 // Note: We don't test that info->si_code == SEGV_ACCERR here.
548 // this si_code is so generic that it is almost meaningless; and
549 // the si_code for this condition may change in the future.
550 // Furthermore, a false-positive should be harmless.
551 if (UnguardOnExecutionViolation > 0 &&
552 (sig == SIGSEGV || sig == SIGBUS) &&
553 uc->uc_mcontext.gregs[TRAPNO] == T_PGFLT) { // page fault
554 int page_size = os::vm_page_size();
555 address addr = (address) info->si_addr;
556 address pc = (address) uc->uc_mcontext.gregs[REG_PC];
557 // Make sure the pc and the faulting address are sane.
558 //
559 // If an instruction spans a page boundary, and the page containing
560 // the beginning of the instruction is executable but the following
561 // page is not, the pc and the faulting address might be slightly
562 // different - we still want to unguard the 2nd page in this case.
563 //
564 // 15 bytes seems to be a (very) safe value for max instruction size.
565 bool pc_is_near_addr =
566 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15);
567 bool instr_spans_page_boundary =
568 (align_size_down((intptr_t) pc ^ (intptr_t) addr,
569 (intptr_t) page_size) > 0);
571 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) {
572 static volatile address last_addr =
573 (address) os::non_memory_address_word();
575 // In conservative mode, don't unguard unless the address is in the VM
576 if (addr != last_addr &&
577 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) {
579 // Unguard and retry
580 address page_start =
581 (address) align_size_down((intptr_t) addr, (intptr_t) page_size);
582 bool res = os::unguard_memory((char*) page_start, page_size);
584 if (PrintMiscellaneous && Verbose) {
585 char buf[256];
586 jio_snprintf(buf, sizeof(buf), "Execution protection violation "
587 "at " INTPTR_FORMAT
588 ", unguarding " INTPTR_FORMAT ": %s, errno=%d", addr,
589 page_start, (res ? "success" : "failed"), errno);
590 tty->print_raw_cr(buf);
591 }
592 stub = pc;
594 // Set last_addr so if we fault again at the same address, we don't end
595 // up in an endless loop.
596 //
597 // There are two potential complications here. Two threads trapping at
598 // the same address at the same time could cause one of the threads to
599 // think it already unguarded, and abort the VM. Likely very rare.
600 //
601 // The other race involves two threads alternately trapping at
602 // different addresses and failing to unguard the page, resulting in
603 // an endless loop. This condition is probably even more unlikely than
604 // the first.
605 //
606 // Although both cases could be avoided by using locks or thread local
607 // last_addr, these solutions are unnecessary complication: this
608 // handler is a best-effort safety net, not a complete solution. It is
609 // disabled by default and should only be used as a workaround in case
610 // we missed any no-execute-unsafe VM code.
612 last_addr = addr;
613 }
614 }
615 }
617 if (stub != NULL) {
618 // save all thread context in case we need to restore it
620 if (thread != NULL) thread->set_saved_exception_pc(pc);
621 // 12/02/99: On Sparc it appears that the full context is also saved
622 // but as yet, no one looks at or restores that saved context
623 // factor me: setPC
624 uc->uc_mcontext.gregs[REG_PC] = (greg_t)stub;
625 return true;
626 }
628 // signal-chaining
629 if (os::Solaris::chained_handler(sig, info, ucVoid)) {
630 return true;
631 }
633 #ifndef AMD64
634 // Workaround (bug 4900493) for Solaris kernel bug 4966651.
635 // Handle an undefined selector caused by an attempt to assign
636 // fs in libthread getipriptr(). With the current libthread design every 512
637 // thread creations the LDT for a private thread data structure is extended
638 // and thre is a hazard that and another thread attempting a thread creation
639 // will use a stale LDTR that doesn't reflect the structure's growth,
640 // causing a GP fault.
641 // Enforce the probable limit of passes through here to guard against an
642 // infinite loop if some other move to fs caused the GP fault. Note that
643 // this loop counter is ultimately a heuristic as it is possible for
644 // more than one thread to generate this fault at a time in an MP system.
645 // In the case of the loop count being exceeded or if the poll fails
646 // just fall through to a fatal error.
647 // If there is some other source of T_GPFLT traps and the text at EIP is
648 // unreadable this code will loop infinitely until the stack is exausted.
649 // The key to diagnosis in this case is to look for the bottom signal handler
650 // frame.
652 if(! IgnoreLibthreadGPFault) {
653 if (sig == SIGSEGV && uc->uc_mcontext.gregs[TRAPNO] == T_GPFLT) {
654 const unsigned char *p =
655 (unsigned const char *) uc->uc_mcontext.gregs[EIP];
657 // Expected instruction?
659 if(p[0] == movlfs[0] && p[1] == movlfs[1]) {
661 Atomic::inc(&ldtr_refresh);
663 // Infinite loop?
665 if(ldtr_refresh < ((2 << 16) / PAGESIZE)) {
667 // No, force scheduling to get a fresh view of the LDTR
669 if(poll(NULL, 0, 10) == 0) {
671 // Retry the move
673 return false;
674 }
675 }
676 }
677 }
678 }
679 #endif // !AMD64
681 if (!abort_if_unrecognized) {
682 // caller wants another chance, so give it to him
683 return false;
684 }
686 if (!os::Solaris::libjsig_is_loaded) {
687 struct sigaction oldAct;
688 sigaction(sig, (struct sigaction *)0, &oldAct);
689 if (oldAct.sa_sigaction != signalHandler) {
690 void* sighand = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
691 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
692 warning("Unexpected Signal %d occured under user-defined signal handler %#lx", sig, (long)sighand);
693 }
694 }
696 if (pc == NULL && uc != NULL) {
697 pc = (address) uc->uc_mcontext.gregs[REG_PC];
698 }
700 // unmask current signal
701 sigset_t newset;
702 sigemptyset(&newset);
703 sigaddset(&newset, sig);
704 sigprocmask(SIG_UNBLOCK, &newset, NULL);
706 VMError err(t, sig, pc, info, ucVoid);
707 err.report_and_die();
709 ShouldNotReachHere();
710 }
712 void os::print_context(outputStream *st, void *context) {
713 if (context == NULL) return;
715 ucontext_t *uc = (ucontext_t*)context;
716 st->print_cr("Registers:");
717 #ifdef AMD64
718 st->print( "RAX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RAX]);
719 st->print(", RBX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RBX]);
720 st->print(", RCX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RCX]);
721 st->print(", RDX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RDX]);
722 st->cr();
723 st->print( "RSP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RSP]);
724 st->print(", RBP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RBP]);
725 st->print(", RSI=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RSI]);
726 st->print(", RDI=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RDI]);
727 st->cr();
728 st->print(", R8=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R8]);
729 st->print(", R9=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R9]);
730 st->print(", R10=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R10]);
731 st->print(", R11=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R11]);
732 st->print(", R12=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R12]);
733 st->print(", R13=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R13]);
734 st->print(", R14=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R14]);
735 st->print(", R15=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R15]);
736 st->cr();
737 st->print( "RIP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RIP]);
738 st->print(", RFLAGS=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RFL]);
739 #else
740 st->print( "EAX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[EAX]);
741 st->print(", EBX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[EBX]);
742 st->print(", ECX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[ECX]);
743 st->print(", EDX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[EDX]);
744 st->cr();
745 st->print( "ESP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[UESP]);
746 st->print(", EBP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[EBP]);
747 st->print(", ESI=" INTPTR_FORMAT, uc->uc_mcontext.gregs[ESI]);
748 st->print(", EDI=" INTPTR_FORMAT, uc->uc_mcontext.gregs[EDI]);
749 st->cr();
750 st->print( "EIP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[EIP]);
751 st->print(", EFLAGS=" INTPTR_FORMAT, uc->uc_mcontext.gregs[EFL]);
752 #endif // AMD64
753 st->cr();
754 st->cr();
756 intptr_t *sp = (intptr_t *)os::Solaris::ucontext_get_sp(uc);
757 st->print_cr("Top of Stack: (sp=" PTR_FORMAT ")", sp);
758 print_hex_dump(st, (address)sp, (address)(sp + 8*sizeof(intptr_t)), sizeof(intptr_t));
759 st->cr();
761 // Note: it may be unsafe to inspect memory near pc. For example, pc may
762 // point to garbage if entry point in an nmethod is corrupted. Leave
763 // this at the end, and hope for the best.
764 ExtendedPC epc = os::Solaris::ucontext_get_ExtendedPC(uc);
765 address pc = epc.pc();
766 st->print_cr("Instructions: (pc=" PTR_FORMAT ")", pc);
767 print_hex_dump(st, pc - 16, pc + 16, sizeof(char));
768 }
770 #ifdef AMD64
771 void os::Solaris::init_thread_fpu_state(void) {
772 // Nothing to do
773 }
774 #else
775 // From solaris_i486.s
776 extern "C" void fixcw();
778 void os::Solaris::init_thread_fpu_state(void) {
779 // Set fpu to 53 bit precision. This happens too early to use a stub.
780 fixcw();
781 }
783 // These routines are the initial value of atomic_xchg_entry(),
784 // atomic_cmpxchg_entry(), atomic_inc_entry() and fence_entry()
785 // until initialization is complete.
786 // TODO - replace with .il implementation when compiler supports it.
788 typedef jint xchg_func_t (jint, volatile jint*);
789 typedef jint cmpxchg_func_t (jint, volatile jint*, jint);
790 typedef jlong cmpxchg_long_func_t(jlong, volatile jlong*, jlong);
791 typedef jint add_func_t (jint, volatile jint*);
792 typedef void fence_func_t ();
794 jint os::atomic_xchg_bootstrap(jint exchange_value, volatile jint* dest) {
795 // try to use the stub:
796 xchg_func_t* func = CAST_TO_FN_PTR(xchg_func_t*, StubRoutines::atomic_xchg_entry());
798 if (func != NULL) {
799 os::atomic_xchg_func = func;
800 return (*func)(exchange_value, dest);
801 }
802 assert(Threads::number_of_threads() == 0, "for bootstrap only");
804 jint old_value = *dest;
805 *dest = exchange_value;
806 return old_value;
807 }
809 jint os::atomic_cmpxchg_bootstrap(jint exchange_value, volatile jint* dest, jint compare_value) {
810 // try to use the stub:
811 cmpxchg_func_t* func = CAST_TO_FN_PTR(cmpxchg_func_t*, StubRoutines::atomic_cmpxchg_entry());
813 if (func != NULL) {
814 os::atomic_cmpxchg_func = func;
815 return (*func)(exchange_value, dest, compare_value);
816 }
817 assert(Threads::number_of_threads() == 0, "for bootstrap only");
819 jint old_value = *dest;
820 if (old_value == compare_value)
821 *dest = exchange_value;
822 return old_value;
823 }
825 jlong os::atomic_cmpxchg_long_bootstrap(jlong exchange_value, volatile jlong* dest, jlong compare_value) {
826 // try to use the stub:
827 cmpxchg_long_func_t* func = CAST_TO_FN_PTR(cmpxchg_long_func_t*, StubRoutines::atomic_cmpxchg_long_entry());
829 if (func != NULL) {
830 os::atomic_cmpxchg_long_func = func;
831 return (*func)(exchange_value, dest, compare_value);
832 }
833 assert(Threads::number_of_threads() == 0, "for bootstrap only");
835 jlong old_value = *dest;
836 if (old_value == compare_value)
837 *dest = exchange_value;
838 return old_value;
839 }
841 jint os::atomic_add_bootstrap(jint add_value, volatile jint* dest) {
842 // try to use the stub:
843 add_func_t* func = CAST_TO_FN_PTR(add_func_t*, StubRoutines::atomic_add_entry());
845 if (func != NULL) {
846 os::atomic_add_func = func;
847 return (*func)(add_value, dest);
848 }
849 assert(Threads::number_of_threads() == 0, "for bootstrap only");
851 return (*dest) += add_value;
852 }
854 void os::fence_bootstrap() {
855 // try to use the stub:
856 fence_func_t* func = CAST_TO_FN_PTR(fence_func_t*, StubRoutines::fence_entry());
858 if (func != NULL) {
859 os::fence_func = func;
860 (*func)();
861 return;
862 }
863 assert(Threads::number_of_threads() == 0, "for bootstrap only");
865 // don't have to do anything for a single thread
866 }
868 xchg_func_t* os::atomic_xchg_func = os::atomic_xchg_bootstrap;
869 cmpxchg_func_t* os::atomic_cmpxchg_func = os::atomic_cmpxchg_bootstrap;
870 cmpxchg_long_func_t* os::atomic_cmpxchg_long_func = os::atomic_cmpxchg_long_bootstrap;
871 add_func_t* os::atomic_add_func = os::atomic_add_bootstrap;
872 fence_func_t* os::fence_func = os::fence_bootstrap;
874 extern "C" _solaris_raw_setup_fpu(address ptr);
875 void os::setup_fpu() {
876 address fpu_cntrl = StubRoutines::addr_fpu_cntrl_wrd_std();
877 _solaris_raw_setup_fpu(fpu_cntrl);
878 }
879 #endif // AMD64