Fri, 27 Feb 2009 13:27:09 -0800
6810672: Comment typos
Summary: I have collected some typos I have found while looking at the code.
Reviewed-by: kvn, never
1 /*
2 * Copyright 1999-2009 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 #endif // AMD64
304 bool os::supports_sse() {
305 #ifdef AMD64
306 return true;
307 #else
308 if (sse_status == SSE_UNKNOWN)
309 check_for_sse_support();
310 return sse_status == SSE_SUPPORTED;
311 #endif // AMD64
312 }
314 bool os::is_allocatable(size_t bytes) {
315 #ifdef AMD64
316 return true;
317 #else
319 if (bytes < 2 * G) {
320 return true;
321 }
323 char* addr = reserve_memory(bytes, NULL);
325 if (addr != NULL) {
326 release_memory(addr, bytes);
327 }
329 return addr != NULL;
330 #endif // AMD64
332 }
334 extern "C" int JVM_handle_solaris_signal(int signo, siginfo_t* siginfo, void* ucontext, int abort_if_unrecognized);
336 extern "C" void Fetch32PFI () ;
337 extern "C" void Fetch32Resume () ;
338 #ifdef AMD64
339 extern "C" void FetchNPFI () ;
340 extern "C" void FetchNResume () ;
341 #endif // AMD64
343 int JVM_handle_solaris_signal(int sig, siginfo_t* info, void* ucVoid, int abort_if_unrecognized) {
344 ucontext_t* uc = (ucontext_t*) ucVoid;
346 #ifndef AMD64
347 if (sig == SIGILL && info->si_addr == (caddr_t)sse_check) {
348 // the SSE instruction faulted. supports_sse() need return false.
349 uc->uc_mcontext.gregs[EIP] = (greg_t)sse_unavailable;
350 return true;
351 }
352 #endif // !AMD64
354 Thread* t = ThreadLocalStorage::get_thread_slow(); // slow & steady
356 SignalHandlerMark shm(t);
358 if(sig == SIGPIPE || sig == SIGXFSZ) {
359 if (os::Solaris::chained_handler(sig, info, ucVoid)) {
360 return true;
361 } else {
362 if (PrintMiscellaneous && (WizardMode || Verbose)) {
363 char buf[64];
364 warning("Ignoring %s - see 4229104 or 6499219",
365 os::exception_name(sig, buf, sizeof(buf)));
367 }
368 return true;
369 }
370 }
372 JavaThread* thread = NULL;
373 VMThread* vmthread = NULL;
375 if (os::Solaris::signal_handlers_are_installed) {
376 if (t != NULL ){
377 if(t->is_Java_thread()) {
378 thread = (JavaThread*)t;
379 }
380 else if(t->is_VM_thread()){
381 vmthread = (VMThread *)t;
382 }
383 }
384 }
386 guarantee(sig != os::Solaris::SIGinterrupt(), "Can not chain VM interrupt signal, try -XX:+UseAltSigs");
388 if (sig == os::Solaris::SIGasync()) {
389 if(thread){
390 OSThread::InterruptArguments args(thread, uc);
391 thread->osthread()->do_interrupt_callbacks_at_interrupt(&args);
392 return true;
393 }
394 else if(vmthread){
395 OSThread::InterruptArguments args(vmthread, uc);
396 vmthread->osthread()->do_interrupt_callbacks_at_interrupt(&args);
397 return true;
398 } else if (os::Solaris::chained_handler(sig, info, ucVoid)) {
399 return true;
400 } else {
401 // If os::Solaris::SIGasync not chained, and this is a non-vm and
402 // non-java thread
403 return true;
404 }
405 }
407 if (info == NULL || info->si_code <= 0 || info->si_code == SI_NOINFO) {
408 // can't decode this kind of signal
409 info = NULL;
410 } else {
411 assert(sig == info->si_signo, "bad siginfo");
412 }
414 // decide if this trap can be handled by a stub
415 address stub = NULL;
417 address pc = NULL;
419 //%note os_trap_1
420 if (info != NULL && uc != NULL && thread != NULL) {
421 // factor me: getPCfromContext
422 pc = (address) uc->uc_mcontext.gregs[REG_PC];
424 // SafeFetch32() support
425 if (pc == (address) Fetch32PFI) {
426 uc->uc_mcontext.gregs[REG_PC] = intptr_t(Fetch32Resume) ;
427 return true ;
428 }
429 #ifdef AMD64
430 if (pc == (address) FetchNPFI) {
431 uc->uc_mcontext.gregs [REG_PC] = intptr_t(FetchNResume) ;
432 return true ;
433 }
434 #endif // AMD64
436 // Handle ALL stack overflow variations here
437 if (sig == SIGSEGV && info->si_code == SEGV_ACCERR) {
438 address addr = (address) info->si_addr;
439 if (thread->in_stack_yellow_zone(addr)) {
440 thread->disable_stack_yellow_zone();
441 if (thread->thread_state() == _thread_in_Java) {
442 // Throw a stack overflow exception. Guard pages will be reenabled
443 // while unwinding the stack.
444 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW);
445 } else {
446 // Thread was in the vm or native code. Return and try to finish.
447 return true;
448 }
449 } else if (thread->in_stack_red_zone(addr)) {
450 // Fatal red zone violation. Disable the guard pages and fall through
451 // to handle_unexpected_exception way down below.
452 thread->disable_stack_red_zone();
453 tty->print_raw_cr("An irrecoverable stack overflow has occurred.");
454 }
455 }
457 if (thread->thread_state() == _thread_in_vm) {
458 if (sig == SIGBUS && info->si_code == BUS_OBJERR && thread->doing_unsafe_access()) {
459 stub = StubRoutines::handler_for_unsafe_access();
460 }
461 }
463 if (thread->thread_state() == _thread_in_Java) {
464 // Support Safepoint Polling
465 if ( sig == SIGSEGV && os::is_poll_address((address)info->si_addr)) {
466 stub = SharedRuntime::get_poll_stub(pc);
467 }
468 else if (sig == SIGBUS && info->si_code == BUS_OBJERR) {
469 // BugId 4454115: A read from a MappedByteBuffer can fault
470 // here if the underlying file has been truncated.
471 // Do not crash the VM in such a case.
472 CodeBlob* cb = CodeCache::find_blob_unsafe(pc);
473 nmethod* nm = cb->is_nmethod() ? (nmethod*)cb : NULL;
474 if (nm != NULL && nm->has_unsafe_access()) {
475 stub = StubRoutines::handler_for_unsafe_access();
476 }
477 }
478 else
479 if (sig == SIGFPE && info->si_code == FPE_INTDIV) {
480 // integer divide by zero
481 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO);
482 }
483 #ifndef AMD64
484 else if (sig == SIGFPE && info->si_code == FPE_FLTDIV) {
485 // floating-point divide by zero
486 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO);
487 }
488 else if (sig == SIGFPE && info->si_code == FPE_FLTINV) {
489 // The encoding of D2I in i486.ad can cause an exception prior
490 // to the fist instruction if there was an invalid operation
491 // pending. We want to dismiss that exception. From the win_32
492 // side it also seems that if it really was the fist causing
493 // the exception that we do the d2i by hand with different
494 // rounding. Seems kind of weird. QQQ TODO
495 // Note that we take the exception at the NEXT floating point instruction.
496 if (pc[0] == 0xDB) {
497 assert(pc[0] == 0xDB, "not a FIST opcode");
498 assert(pc[1] == 0x14, "not a FIST opcode");
499 assert(pc[2] == 0x24, "not a FIST opcode");
500 return true;
501 } else {
502 assert(pc[-3] == 0xDB, "not an flt invalid opcode");
503 assert(pc[-2] == 0x14, "not an flt invalid opcode");
504 assert(pc[-1] == 0x24, "not an flt invalid opcode");
505 }
506 }
507 else if (sig == SIGFPE ) {
508 tty->print_cr("caught SIGFPE, info 0x%x.", info->si_code);
509 }
510 #endif // !AMD64
512 // QQQ It doesn't seem that we need to do this on x86 because we should be able
513 // to return properly from the handler without this extra stuff on the back side.
515 else if (sig == SIGSEGV && info->si_code > 0 && !MacroAssembler::needs_explicit_null_check((intptr_t)info->si_addr)) {
516 // Determination of interpreter/vtable stub/compiled code null exception
517 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
518 }
519 }
521 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in
522 // and the heap gets shrunk before the field access.
523 if ((sig == SIGSEGV) || (sig == SIGBUS)) {
524 address addr = JNI_FastGetField::find_slowcase_pc(pc);
525 if (addr != (address)-1) {
526 stub = addr;
527 }
528 }
530 // Check to see if we caught the safepoint code in the
531 // process of write protecting the memory serialization page.
532 // It write enables the page immediately after protecting it
533 // so we can just return to retry the write.
534 if ((sig == SIGSEGV) &&
535 os::is_memory_serialize_page(thread, (address)info->si_addr)) {
536 // Block current thread until the memory serialize page permission restored.
537 os::block_on_serialize_page_trap();
538 return true;
539 }
540 }
542 // Execution protection violation
543 //
544 // Preventative code for future versions of Solaris which may
545 // enable execution protection when running the 32-bit VM on AMD64.
546 //
547 // This should be kept as the last step in the triage. We don't
548 // have a dedicated trap number for a no-execute fault, so be
549 // conservative and allow other handlers the first shot.
550 //
551 // Note: We don't test that info->si_code == SEGV_ACCERR here.
552 // this si_code is so generic that it is almost meaningless; and
553 // the si_code for this condition may change in the future.
554 // Furthermore, a false-positive should be harmless.
555 if (UnguardOnExecutionViolation > 0 &&
556 (sig == SIGSEGV || sig == SIGBUS) &&
557 uc->uc_mcontext.gregs[TRAPNO] == T_PGFLT) { // page fault
558 int page_size = os::vm_page_size();
559 address addr = (address) info->si_addr;
560 address pc = (address) uc->uc_mcontext.gregs[REG_PC];
561 // Make sure the pc and the faulting address are sane.
562 //
563 // If an instruction spans a page boundary, and the page containing
564 // the beginning of the instruction is executable but the following
565 // page is not, the pc and the faulting address might be slightly
566 // different - we still want to unguard the 2nd page in this case.
567 //
568 // 15 bytes seems to be a (very) safe value for max instruction size.
569 bool pc_is_near_addr =
570 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15);
571 bool instr_spans_page_boundary =
572 (align_size_down((intptr_t) pc ^ (intptr_t) addr,
573 (intptr_t) page_size) > 0);
575 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) {
576 static volatile address last_addr =
577 (address) os::non_memory_address_word();
579 // In conservative mode, don't unguard unless the address is in the VM
580 if (addr != last_addr &&
581 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) {
583 // Make memory rwx and retry
584 address page_start =
585 (address) align_size_down((intptr_t) addr, (intptr_t) page_size);
586 bool res = os::protect_memory((char*) page_start, page_size,
587 os::MEM_PROT_RWX);
589 if (PrintMiscellaneous && Verbose) {
590 char buf[256];
591 jio_snprintf(buf, sizeof(buf), "Execution protection violation "
592 "at " INTPTR_FORMAT
593 ", unguarding " INTPTR_FORMAT ": %s, errno=%d", addr,
594 page_start, (res ? "success" : "failed"), errno);
595 tty->print_raw_cr(buf);
596 }
597 stub = pc;
599 // Set last_addr so if we fault again at the same address, we don't end
600 // up in an endless loop.
601 //
602 // There are two potential complications here. Two threads trapping at
603 // the same address at the same time could cause one of the threads to
604 // think it already unguarded, and abort the VM. Likely very rare.
605 //
606 // The other race involves two threads alternately trapping at
607 // different addresses and failing to unguard the page, resulting in
608 // an endless loop. This condition is probably even more unlikely than
609 // the first.
610 //
611 // Although both cases could be avoided by using locks or thread local
612 // last_addr, these solutions are unnecessary complication: this
613 // handler is a best-effort safety net, not a complete solution. It is
614 // disabled by default and should only be used as a workaround in case
615 // we missed any no-execute-unsafe VM code.
617 last_addr = addr;
618 }
619 }
620 }
622 if (stub != NULL) {
623 // save all thread context in case we need to restore it
625 if (thread != NULL) thread->set_saved_exception_pc(pc);
626 // 12/02/99: On Sparc it appears that the full context is also saved
627 // but as yet, no one looks at or restores that saved context
628 // factor me: setPC
629 uc->uc_mcontext.gregs[REG_PC] = (greg_t)stub;
630 return true;
631 }
633 // signal-chaining
634 if (os::Solaris::chained_handler(sig, info, ucVoid)) {
635 return true;
636 }
638 #ifndef AMD64
639 // Workaround (bug 4900493) for Solaris kernel bug 4966651.
640 // Handle an undefined selector caused by an attempt to assign
641 // fs in libthread getipriptr(). With the current libthread design every 512
642 // thread creations the LDT for a private thread data structure is extended
643 // and thre is a hazard that and another thread attempting a thread creation
644 // will use a stale LDTR that doesn't reflect the structure's growth,
645 // causing a GP fault.
646 // Enforce the probable limit of passes through here to guard against an
647 // infinite loop if some other move to fs caused the GP fault. Note that
648 // this loop counter is ultimately a heuristic as it is possible for
649 // more than one thread to generate this fault at a time in an MP system.
650 // In the case of the loop count being exceeded or if the poll fails
651 // just fall through to a fatal error.
652 // If there is some other source of T_GPFLT traps and the text at EIP is
653 // unreadable this code will loop infinitely until the stack is exausted.
654 // The key to diagnosis in this case is to look for the bottom signal handler
655 // frame.
657 if(! IgnoreLibthreadGPFault) {
658 if (sig == SIGSEGV && uc->uc_mcontext.gregs[TRAPNO] == T_GPFLT) {
659 const unsigned char *p =
660 (unsigned const char *) uc->uc_mcontext.gregs[EIP];
662 // Expected instruction?
664 if(p[0] == movlfs[0] && p[1] == movlfs[1]) {
666 Atomic::inc(&ldtr_refresh);
668 // Infinite loop?
670 if(ldtr_refresh < ((2 << 16) / PAGESIZE)) {
672 // No, force scheduling to get a fresh view of the LDTR
674 if(poll(NULL, 0, 10) == 0) {
676 // Retry the move
678 return false;
679 }
680 }
681 }
682 }
683 }
684 #endif // !AMD64
686 if (!abort_if_unrecognized) {
687 // caller wants another chance, so give it to him
688 return false;
689 }
691 if (!os::Solaris::libjsig_is_loaded) {
692 struct sigaction oldAct;
693 sigaction(sig, (struct sigaction *)0, &oldAct);
694 if (oldAct.sa_sigaction != signalHandler) {
695 void* sighand = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
696 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
697 warning("Unexpected Signal %d occurred under user-defined signal handler %#lx", sig, (long)sighand);
698 }
699 }
701 if (pc == NULL && uc != NULL) {
702 pc = (address) uc->uc_mcontext.gregs[REG_PC];
703 }
705 // unmask current signal
706 sigset_t newset;
707 sigemptyset(&newset);
708 sigaddset(&newset, sig);
709 sigprocmask(SIG_UNBLOCK, &newset, NULL);
711 VMError err(t, sig, pc, info, ucVoid);
712 err.report_and_die();
714 ShouldNotReachHere();
715 }
717 void os::print_context(outputStream *st, void *context) {
718 if (context == NULL) return;
720 ucontext_t *uc = (ucontext_t*)context;
721 st->print_cr("Registers:");
722 #ifdef AMD64
723 st->print( "RAX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RAX]);
724 st->print(", RBX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RBX]);
725 st->print(", RCX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RCX]);
726 st->print(", RDX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RDX]);
727 st->cr();
728 st->print( "RSP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RSP]);
729 st->print(", RBP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RBP]);
730 st->print(", RSI=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RSI]);
731 st->print(", RDI=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RDI]);
732 st->cr();
733 st->print(", R8=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R8]);
734 st->print(", R9=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R9]);
735 st->print(", R10=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R10]);
736 st->print(", R11=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R11]);
737 st->print(", R12=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R12]);
738 st->print(", R13=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R13]);
739 st->print(", R14=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R14]);
740 st->print(", R15=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R15]);
741 st->cr();
742 st->print( "RIP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RIP]);
743 st->print(", RFLAGS=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RFL]);
744 #else
745 st->print( "EAX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[EAX]);
746 st->print(", EBX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[EBX]);
747 st->print(", ECX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[ECX]);
748 st->print(", EDX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[EDX]);
749 st->cr();
750 st->print( "ESP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[UESP]);
751 st->print(", EBP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[EBP]);
752 st->print(", ESI=" INTPTR_FORMAT, uc->uc_mcontext.gregs[ESI]);
753 st->print(", EDI=" INTPTR_FORMAT, uc->uc_mcontext.gregs[EDI]);
754 st->cr();
755 st->print( "EIP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[EIP]);
756 st->print(", EFLAGS=" INTPTR_FORMAT, uc->uc_mcontext.gregs[EFL]);
757 #endif // AMD64
758 st->cr();
759 st->cr();
761 intptr_t *sp = (intptr_t *)os::Solaris::ucontext_get_sp(uc);
762 st->print_cr("Top of Stack: (sp=" PTR_FORMAT ")", sp);
763 print_hex_dump(st, (address)sp, (address)(sp + 8*sizeof(intptr_t)), sizeof(intptr_t));
764 st->cr();
766 // Note: it may be unsafe to inspect memory near pc. For example, pc may
767 // point to garbage if entry point in an nmethod is corrupted. Leave
768 // this at the end, and hope for the best.
769 ExtendedPC epc = os::Solaris::ucontext_get_ExtendedPC(uc);
770 address pc = epc.pc();
771 st->print_cr("Instructions: (pc=" PTR_FORMAT ")", pc);
772 print_hex_dump(st, pc - 16, pc + 16, sizeof(char));
773 }
775 #ifdef AMD64
776 void os::Solaris::init_thread_fpu_state(void) {
777 // Nothing to do
778 }
779 #else
780 // From solaris_i486.s
781 extern "C" void fixcw();
783 void os::Solaris::init_thread_fpu_state(void) {
784 // Set fpu to 53 bit precision. This happens too early to use a stub.
785 fixcw();
786 }
788 // These routines are the initial value of atomic_xchg_entry(),
789 // atomic_cmpxchg_entry(), atomic_inc_entry() and fence_entry()
790 // until initialization is complete.
791 // TODO - replace with .il implementation when compiler supports it.
793 typedef jint xchg_func_t (jint, volatile jint*);
794 typedef jint cmpxchg_func_t (jint, volatile jint*, jint);
795 typedef jlong cmpxchg_long_func_t(jlong, volatile jlong*, jlong);
796 typedef jint add_func_t (jint, volatile jint*);
797 typedef void fence_func_t ();
799 jint os::atomic_xchg_bootstrap(jint exchange_value, volatile jint* dest) {
800 // try to use the stub:
801 xchg_func_t* func = CAST_TO_FN_PTR(xchg_func_t*, StubRoutines::atomic_xchg_entry());
803 if (func != NULL) {
804 os::atomic_xchg_func = func;
805 return (*func)(exchange_value, dest);
806 }
807 assert(Threads::number_of_threads() == 0, "for bootstrap only");
809 jint old_value = *dest;
810 *dest = exchange_value;
811 return old_value;
812 }
814 jint os::atomic_cmpxchg_bootstrap(jint exchange_value, volatile jint* dest, jint compare_value) {
815 // try to use the stub:
816 cmpxchg_func_t* func = CAST_TO_FN_PTR(cmpxchg_func_t*, StubRoutines::atomic_cmpxchg_entry());
818 if (func != NULL) {
819 os::atomic_cmpxchg_func = func;
820 return (*func)(exchange_value, dest, compare_value);
821 }
822 assert(Threads::number_of_threads() == 0, "for bootstrap only");
824 jint old_value = *dest;
825 if (old_value == compare_value)
826 *dest = exchange_value;
827 return old_value;
828 }
830 jlong os::atomic_cmpxchg_long_bootstrap(jlong exchange_value, volatile jlong* dest, jlong compare_value) {
831 // try to use the stub:
832 cmpxchg_long_func_t* func = CAST_TO_FN_PTR(cmpxchg_long_func_t*, StubRoutines::atomic_cmpxchg_long_entry());
834 if (func != NULL) {
835 os::atomic_cmpxchg_long_func = func;
836 return (*func)(exchange_value, dest, compare_value);
837 }
838 assert(Threads::number_of_threads() == 0, "for bootstrap only");
840 jlong old_value = *dest;
841 if (old_value == compare_value)
842 *dest = exchange_value;
843 return old_value;
844 }
846 jint os::atomic_add_bootstrap(jint add_value, volatile jint* dest) {
847 // try to use the stub:
848 add_func_t* func = CAST_TO_FN_PTR(add_func_t*, StubRoutines::atomic_add_entry());
850 if (func != NULL) {
851 os::atomic_add_func = func;
852 return (*func)(add_value, dest);
853 }
854 assert(Threads::number_of_threads() == 0, "for bootstrap only");
856 return (*dest) += add_value;
857 }
859 void os::fence_bootstrap() {
860 // try to use the stub:
861 fence_func_t* func = CAST_TO_FN_PTR(fence_func_t*, StubRoutines::fence_entry());
863 if (func != NULL) {
864 os::fence_func = func;
865 (*func)();
866 return;
867 }
868 assert(Threads::number_of_threads() == 0, "for bootstrap only");
870 // don't have to do anything for a single thread
871 }
873 xchg_func_t* os::atomic_xchg_func = os::atomic_xchg_bootstrap;
874 cmpxchg_func_t* os::atomic_cmpxchg_func = os::atomic_cmpxchg_bootstrap;
875 cmpxchg_long_func_t* os::atomic_cmpxchg_long_func = os::atomic_cmpxchg_long_bootstrap;
876 add_func_t* os::atomic_add_func = os::atomic_add_bootstrap;
877 fence_func_t* os::fence_func = os::fence_bootstrap;
879 extern "C" _solaris_raw_setup_fpu(address ptr);
880 void os::setup_fpu() {
881 address fpu_cntrl = StubRoutines::addr_fpu_cntrl_wrd_std();
882 _solaris_raw_setup_fpu(fpu_cntrl);
883 }
884 #endif // AMD64