Mercurial > jdk8-mips64-public > hotspot / file revision
src/os/posix/vm/os_posix.cpp@833b0f92429a
src/os/posix/vm/os_posix.cpp
Wed, 27 Aug 2014 08:19:12 -0400
- author
- zgu
- date
- Wed, 27 Aug 2014 08:19:12 -0400
- changeset 7074
- 833b0f92429a
- parent 6680
- 78bbf4d43a14
- child 7535
- 7ae4e26cb1e0
- child 8423
- 2988e5adeb8c
- permissions
- -rw-r--r--
8046598: Scalable Native memory tracking development
Summary: Enhance scalability of native memory tracking
Reviewed-by: coleenp, ctornqvi, gtriantafill
1 /*
2 * Copyright (c) 1999, 2014, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
25 #include "utilities/globalDefinitions.hpp"
26 #include "prims/jvm.h"
27 #include "runtime/frame.inline.hpp"
28 #include "runtime/os.hpp"
29 #include "utilities/vmError.hpp"
31 #include <signal.h>
32 #include <unistd.h>
33 #include <sys/resource.h>
34 #include <sys/utsname.h>
35 #include <pthread.h>
36 #include <signal.h>
38 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
40 // Todo: provide a os::get_max_process_id() or similar. Number of processes
41 // may have been configured, can be read more accurately from proc fs etc.
42 #ifndef MAX_PID
43 #define MAX_PID INT_MAX
44 #endif
45 #define IS_VALID_PID(p) (p > 0 && p < MAX_PID)
47 // Check core dump limit and report possible place where core can be found
48 void os::check_or_create_dump(void* exceptionRecord, void* contextRecord, char* buffer, size_t bufferSize) {
49 int n;
50 struct rlimit rlim;
51 bool success;
53 n = get_core_path(buffer, bufferSize);
55 if (getrlimit(RLIMIT_CORE, &rlim) != 0) {
56 jio_snprintf(buffer + n, bufferSize - n, "/core or core.%d (may not exist)", current_process_id());
57 success = true;
58 } else {
59 switch(rlim.rlim_cur) {
60 case RLIM_INFINITY:
61 jio_snprintf(buffer + n, bufferSize - n, "/core or core.%d", current_process_id());
62 success = true;
63 break;
64 case 0:
65 jio_snprintf(buffer, bufferSize, "Core dumps have been disabled. To enable core dumping, try \"ulimit -c unlimited\" before starting Java again");
66 success = false;
67 break;
68 default:
69 jio_snprintf(buffer + n, bufferSize - n, "/core or core.%d (max size %lu kB). To ensure a full core dump, try \"ulimit -c unlimited\" before starting Java again", current_process_id(), (unsigned long)(rlim.rlim_cur >> 10));
70 success = true;
71 break;
72 }
73 }
74 VMError::report_coredump_status(buffer, success);
75 }
77 int os::get_native_stack(address* stack, int frames, int toSkip) {
78 #ifdef _NMT_NOINLINE_
79 toSkip++;
80 #endif
82 int frame_idx = 0;
83 int num_of_frames; // number of frames captured
84 frame fr = os::current_frame();
85 while (fr.pc() && frame_idx < frames) {
86 if (toSkip > 0) {
87 toSkip --;
88 } else {
89 stack[frame_idx ++] = fr.pc();
90 }
91 if (fr.fp() == NULL || os::is_first_C_frame(&fr)
92 ||fr.sender_pc() == NULL || fr.cb() != NULL) break;
94 if (fr.sender_pc() && !os::is_first_C_frame(&fr)) {
95 fr = os::get_sender_for_C_frame(&fr);
96 } else {
97 break;
98 }
99 }
100 num_of_frames = frame_idx;
101 for (; frame_idx < frames; frame_idx ++) {
102 stack[frame_idx] = NULL;
103 }
105 return num_of_frames;
106 }
109 bool os::unsetenv(const char* name) {
110 assert(name != NULL, "Null pointer");
111 return (::unsetenv(name) == 0);
112 }
114 int os::get_last_error() {
115 return errno;
116 }
118 bool os::is_debugger_attached() {
119 // not implemented
120 return false;
121 }
123 void os::wait_for_keypress_at_exit(void) {
124 // don't do anything on posix platforms
125 return;
126 }
128 // Multiple threads can race in this code, and can remap over each other with MAP_FIXED,
129 // so on posix, unmap the section at the start and at the end of the chunk that we mapped
130 // rather than unmapping and remapping the whole chunk to get requested alignment.
131 char* os::reserve_memory_aligned(size_t size, size_t alignment) {
132 assert((alignment & (os::vm_allocation_granularity() - 1)) == 0,
133 "Alignment must be a multiple of allocation granularity (page size)");
134 assert((size & (alignment -1)) == 0, "size must be 'alignment' aligned");
136 size_t extra_size = size + alignment;
137 assert(extra_size >= size, "overflow, size is too large to allow alignment");
139 char* extra_base = os::reserve_memory(extra_size, NULL, alignment);
141 if (extra_base == NULL) {
142 return NULL;
143 }
145 // Do manual alignment
146 char* aligned_base = (char*) align_size_up((uintptr_t) extra_base, alignment);
148 // [ | | ]
149 // ^ extra_base
150 // ^ extra_base + begin_offset == aligned_base
151 // extra_base + begin_offset + size ^
152 // extra_base + extra_size ^
153 // |<>| == begin_offset
154 // end_offset == |<>|
155 size_t begin_offset = aligned_base - extra_base;
156 size_t end_offset = (extra_base + extra_size) - (aligned_base + size);
158 if (begin_offset > 0) {
159 os::release_memory(extra_base, begin_offset);
160 }
162 if (end_offset > 0) {
163 os::release_memory(extra_base + begin_offset + size, end_offset);
164 }
166 return aligned_base;
167 }
169 void os::Posix::print_load_average(outputStream* st) {
170 st->print("load average:");
171 double loadavg[3];
172 os::loadavg(loadavg, 3);
173 st->print("%0.02f %0.02f %0.02f", loadavg[0], loadavg[1], loadavg[2]);
174 st->cr();
175 }
177 void os::Posix::print_rlimit_info(outputStream* st) {
178 st->print("rlimit:");
179 struct rlimit rlim;
181 st->print(" STACK ");
182 getrlimit(RLIMIT_STACK, &rlim);
183 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
184 else st->print("%uk", rlim.rlim_cur >> 10);
186 st->print(", CORE ");
187 getrlimit(RLIMIT_CORE, &rlim);
188 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
189 else st->print("%uk", rlim.rlim_cur >> 10);
191 // Isn't there on solaris
192 #if !defined(TARGET_OS_FAMILY_solaris) && !defined(TARGET_OS_FAMILY_aix)
193 st->print(", NPROC ");
194 getrlimit(RLIMIT_NPROC, &rlim);
195 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
196 else st->print("%d", rlim.rlim_cur);
197 #endif
199 st->print(", NOFILE ");
200 getrlimit(RLIMIT_NOFILE, &rlim);
201 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
202 else st->print("%d", rlim.rlim_cur);
204 st->print(", AS ");
205 getrlimit(RLIMIT_AS, &rlim);
206 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
207 else st->print("%uk", rlim.rlim_cur >> 10);
208 st->cr();
209 }
211 void os::Posix::print_uname_info(outputStream* st) {
212 // kernel
213 st->print("uname:");
214 struct utsname name;
215 uname(&name);
216 st->print("%s ", name.sysname);
217 st->print("%s ", name.release);
218 st->print("%s ", name.version);
219 st->print("%s", name.machine);
220 st->cr();
221 }
223 bool os::has_allocatable_memory_limit(julong* limit) {
224 struct rlimit rlim;
225 int getrlimit_res = getrlimit(RLIMIT_AS, &rlim);
226 // if there was an error when calling getrlimit, assume that there is no limitation
227 // on virtual memory.
228 bool result;
229 if ((getrlimit_res != 0) || (rlim.rlim_cur == RLIM_INFINITY)) {
230 result = false;
231 } else {
232 *limit = (julong)rlim.rlim_cur;
233 result = true;
234 }
235 #ifdef _LP64
236 return result;
237 #else
238 // arbitrary virtual space limit for 32 bit Unices found by testing. If
239 // getrlimit above returned a limit, bound it with this limit. Otherwise
240 // directly use it.
241 const julong max_virtual_limit = (julong)3800*M;
242 if (result) {
243 *limit = MIN2(*limit, max_virtual_limit);
244 } else {
245 *limit = max_virtual_limit;
246 }
248 // bound by actually allocatable memory. The algorithm uses two bounds, an
249 // upper and a lower limit. The upper limit is the current highest amount of
250 // memory that could not be allocated, the lower limit is the current highest
251 // amount of memory that could be allocated.
252 // The algorithm iteratively refines the result by halving the difference
253 // between these limits, updating either the upper limit (if that value could
254 // not be allocated) or the lower limit (if the that value could be allocated)
255 // until the difference between these limits is "small".
257 // the minimum amount of memory we care about allocating.
258 const julong min_allocation_size = M;
260 julong upper_limit = *limit;
262 // first check a few trivial cases
263 if (is_allocatable(upper_limit) || (upper_limit <= min_allocation_size)) {
264 *limit = upper_limit;
265 } else if (!is_allocatable(min_allocation_size)) {
266 // we found that not even min_allocation_size is allocatable. Return it
267 // anyway. There is no point to search for a better value any more.
268 *limit = min_allocation_size;
269 } else {
270 // perform the binary search.
271 julong lower_limit = min_allocation_size;
272 while ((upper_limit - lower_limit) > min_allocation_size) {
273 julong temp_limit = ((upper_limit - lower_limit) / 2) + lower_limit;
274 temp_limit = align_size_down_(temp_limit, min_allocation_size);
275 if (is_allocatable(temp_limit)) {
276 lower_limit = temp_limit;
277 } else {
278 upper_limit = temp_limit;
279 }
280 }
281 *limit = lower_limit;
282 }
283 return true;
284 #endif
285 }
287 const char* os::get_current_directory(char *buf, size_t buflen) {
288 return getcwd(buf, buflen);
289 }
291 FILE* os::open(int fd, const char* mode) {
292 return ::fdopen(fd, mode);
293 }
295 // Builds a platform dependent Agent_OnLoad_<lib_name> function name
296 // which is used to find statically linked in agents.
297 // Parameters:
298 // sym_name: Symbol in library we are looking for
299 // lib_name: Name of library to look in, NULL for shared libs.
300 // is_absolute_path == true if lib_name is absolute path to agent
301 // such as "/a/b/libL.so"
302 // == false if only the base name of the library is passed in
303 // such as "L"
304 char* os::build_agent_function_name(const char *sym_name, const char *lib_name,
305 bool is_absolute_path) {
306 char *agent_entry_name;
307 size_t len;
308 size_t name_len;
309 size_t prefix_len = strlen(JNI_LIB_PREFIX);
310 size_t suffix_len = strlen(JNI_LIB_SUFFIX);
311 const char *start;
313 if (lib_name != NULL) {
314 len = name_len = strlen(lib_name);
315 if (is_absolute_path) {
316 // Need to strip path, prefix and suffix
317 if ((start = strrchr(lib_name, *os::file_separator())) != NULL) {
318 lib_name = ++start;
319 }
320 if (len <= (prefix_len + suffix_len)) {
321 return NULL;
322 }
323 lib_name += prefix_len;
324 name_len = strlen(lib_name) - suffix_len;
325 }
326 }
327 len = (lib_name != NULL ? name_len : 0) + strlen(sym_name) + 2;
328 agent_entry_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtThread);
329 if (agent_entry_name == NULL) {
330 return NULL;
331 }
332 strcpy(agent_entry_name, sym_name);
333 if (lib_name != NULL) {
334 strcat(agent_entry_name, "_");
335 strncat(agent_entry_name, lib_name, name_len);
336 }
337 return agent_entry_name;
338 }
340 // Returned string is a constant. For unknown signals "UNKNOWN" is returned.
341 const char* os::Posix::get_signal_name(int sig, char* out, size_t outlen) {
343 static const struct {
344 int sig; const char* name;
345 }
346 info[] =
347 {
348 { SIGABRT, "SIGABRT" },
349 #ifdef SIGAIO
350 { SIGAIO, "SIGAIO" },
351 #endif
352 { SIGALRM, "SIGALRM" },
353 #ifdef SIGALRM1
354 { SIGALRM1, "SIGALRM1" },
355 #endif
356 { SIGBUS, "SIGBUS" },
357 #ifdef SIGCANCEL
358 { SIGCANCEL, "SIGCANCEL" },
359 #endif
360 { SIGCHLD, "SIGCHLD" },
361 #ifdef SIGCLD
362 { SIGCLD, "SIGCLD" },
363 #endif
364 { SIGCONT, "SIGCONT" },
365 #ifdef SIGCPUFAIL
366 { SIGCPUFAIL, "SIGCPUFAIL" },
367 #endif
368 #ifdef SIGDANGER
369 { SIGDANGER, "SIGDANGER" },
370 #endif
371 #ifdef SIGDIL
372 { SIGDIL, "SIGDIL" },
373 #endif
374 #ifdef SIGEMT
375 { SIGEMT, "SIGEMT" },
376 #endif
377 { SIGFPE, "SIGFPE" },
378 #ifdef SIGFREEZE
379 { SIGFREEZE, "SIGFREEZE" },
380 #endif
381 #ifdef SIGGFAULT
382 { SIGGFAULT, "SIGGFAULT" },
383 #endif
384 #ifdef SIGGRANT
385 { SIGGRANT, "SIGGRANT" },
386 #endif
387 { SIGHUP, "SIGHUP" },
388 { SIGILL, "SIGILL" },
389 { SIGINT, "SIGINT" },
390 #ifdef SIGIO
391 { SIGIO, "SIGIO" },
392 #endif
393 #ifdef SIGIOINT
394 { SIGIOINT, "SIGIOINT" },
395 #endif
396 #ifdef SIGIOT
397 // SIGIOT is there for BSD compatibility, but on most Unices just a
398 // synonym for SIGABRT. The result should be "SIGABRT", not
399 // "SIGIOT".
400 #if (SIGIOT != SIGABRT )
401 { SIGIOT, "SIGIOT" },
402 #endif
403 #endif
404 #ifdef SIGKAP
405 { SIGKAP, "SIGKAP" },
406 #endif
407 { SIGKILL, "SIGKILL" },
408 #ifdef SIGLOST
409 { SIGLOST, "SIGLOST" },
410 #endif
411 #ifdef SIGLWP
412 { SIGLWP, "SIGLWP" },
413 #endif
414 #ifdef SIGLWPTIMER
415 { SIGLWPTIMER, "SIGLWPTIMER" },
416 #endif
417 #ifdef SIGMIGRATE
418 { SIGMIGRATE, "SIGMIGRATE" },
419 #endif
420 #ifdef SIGMSG
421 { SIGMSG, "SIGMSG" },
422 #endif
423 { SIGPIPE, "SIGPIPE" },
424 #ifdef SIGPOLL
425 { SIGPOLL, "SIGPOLL" },
426 #endif
427 #ifdef SIGPRE
428 { SIGPRE, "SIGPRE" },
429 #endif
430 { SIGPROF, "SIGPROF" },
431 #ifdef SIGPTY
432 { SIGPTY, "SIGPTY" },
433 #endif
434 #ifdef SIGPWR
435 { SIGPWR, "SIGPWR" },
436 #endif
437 { SIGQUIT, "SIGQUIT" },
438 #ifdef SIGRECONFIG
439 { SIGRECONFIG, "SIGRECONFIG" },
440 #endif
441 #ifdef SIGRECOVERY
442 { SIGRECOVERY, "SIGRECOVERY" },
443 #endif
444 #ifdef SIGRESERVE
445 { SIGRESERVE, "SIGRESERVE" },
446 #endif
447 #ifdef SIGRETRACT
448 { SIGRETRACT, "SIGRETRACT" },
449 #endif
450 #ifdef SIGSAK
451 { SIGSAK, "SIGSAK" },
452 #endif
453 { SIGSEGV, "SIGSEGV" },
454 #ifdef SIGSOUND
455 { SIGSOUND, "SIGSOUND" },
456 #endif
457 { SIGSTOP, "SIGSTOP" },
458 { SIGSYS, "SIGSYS" },
459 #ifdef SIGSYSERROR
460 { SIGSYSERROR, "SIGSYSERROR" },
461 #endif
462 #ifdef SIGTALRM
463 { SIGTALRM, "SIGTALRM" },
464 #endif
465 { SIGTERM, "SIGTERM" },
466 #ifdef SIGTHAW
467 { SIGTHAW, "SIGTHAW" },
468 #endif
469 { SIGTRAP, "SIGTRAP" },
470 #ifdef SIGTSTP
471 { SIGTSTP, "SIGTSTP" },
472 #endif
473 { SIGTTIN, "SIGTTIN" },
474 { SIGTTOU, "SIGTTOU" },
475 #ifdef SIGURG
476 { SIGURG, "SIGURG" },
477 #endif
478 { SIGUSR1, "SIGUSR1" },
479 { SIGUSR2, "SIGUSR2" },
480 #ifdef SIGVIRT
481 { SIGVIRT, "SIGVIRT" },
482 #endif
483 { SIGVTALRM, "SIGVTALRM" },
484 #ifdef SIGWAITING
485 { SIGWAITING, "SIGWAITING" },
486 #endif
487 #ifdef SIGWINCH
488 { SIGWINCH, "SIGWINCH" },
489 #endif
490 #ifdef SIGWINDOW
491 { SIGWINDOW, "SIGWINDOW" },
492 #endif
493 { SIGXCPU, "SIGXCPU" },
494 { SIGXFSZ, "SIGXFSZ" },
495 #ifdef SIGXRES
496 { SIGXRES, "SIGXRES" },
497 #endif
498 { -1, NULL }
499 };
501 const char* ret = NULL;
503 #ifdef SIGRTMIN
504 if (sig >= SIGRTMIN && sig <= SIGRTMAX) {
505 if (sig == SIGRTMIN) {
506 ret = "SIGRTMIN";
507 } else if (sig == SIGRTMAX) {
508 ret = "SIGRTMAX";
509 } else {
510 jio_snprintf(out, outlen, "SIGRTMIN+%d", sig - SIGRTMIN);
511 return out;
512 }
513 }
514 #endif
516 if (sig > 0) {
517 for (int idx = 0; info[idx].sig != -1; idx ++) {
518 if (info[idx].sig == sig) {
519 ret = info[idx].name;
520 break;
521 }
522 }
523 }
525 if (!ret) {
526 if (!is_valid_signal(sig)) {
527 ret = "INVALID";
528 } else {
529 ret = "UNKNOWN";
530 }
531 }
533 jio_snprintf(out, outlen, ret);
534 return out;
535 }
537 // Returns true if signal number is valid.
538 bool os::Posix::is_valid_signal(int sig) {
539 // MacOS not really POSIX compliant: sigaddset does not return
540 // an error for invalid signal numbers. However, MacOS does not
541 // support real time signals and simply seems to have just 33
542 // signals with no holes in the signal range.
543 #ifdef __APPLE__
544 return sig >= 1 && sig < NSIG;
545 #else
546 // Use sigaddset to check for signal validity.
547 sigset_t set;
548 if (sigaddset(&set, sig) == -1 && errno == EINVAL) {
549 return false;
550 }
551 return true;
552 #endif
553 }
555 #define NUM_IMPORTANT_SIGS 32
556 // Returns one-line short description of a signal set in a user provided buffer.
557 const char* os::Posix::describe_signal_set_short(const sigset_t* set, char* buffer, size_t buf_size) {
558 assert(buf_size == (NUM_IMPORTANT_SIGS + 1), "wrong buffer size");
559 // Note: for shortness, just print out the first 32. That should
560 // cover most of the useful ones, apart from realtime signals.
561 for (int sig = 1; sig <= NUM_IMPORTANT_SIGS; sig++) {
562 const int rc = sigismember(set, sig);
563 if (rc == -1 && errno == EINVAL) {
564 buffer[sig-1] = '?';
565 } else {
566 buffer[sig-1] = rc == 0 ? '0' : '1';
567 }
568 }
569 buffer[NUM_IMPORTANT_SIGS] = 0;
570 return buffer;
571 }
573 // Prints one-line description of a signal set.
574 void os::Posix::print_signal_set_short(outputStream* st, const sigset_t* set) {
575 char buf[NUM_IMPORTANT_SIGS + 1];
576 os::Posix::describe_signal_set_short(set, buf, sizeof(buf));
577 st->print("%s", buf);
578 }
580 // Writes one-line description of a combination of sigaction.sa_flags into a user
581 // provided buffer. Returns that buffer.
582 const char* os::Posix::describe_sa_flags(int flags, char* buffer, size_t size) {
583 char* p = buffer;
584 size_t remaining = size;
585 bool first = true;
586 int idx = 0;
588 assert(buffer, "invalid argument");
590 if (size == 0) {
591 return buffer;
592 }
594 strncpy(buffer, "none", size);
596 const struct {
597 int i;
598 const char* s;
599 } flaginfo [] = {
600 { SA_NOCLDSTOP, "SA_NOCLDSTOP" },
601 { SA_ONSTACK, "SA_ONSTACK" },
602 { SA_RESETHAND, "SA_RESETHAND" },
603 { SA_RESTART, "SA_RESTART" },
604 { SA_SIGINFO, "SA_SIGINFO" },
605 { SA_NOCLDWAIT, "SA_NOCLDWAIT" },
606 { SA_NODEFER, "SA_NODEFER" },
607 #ifdef AIX
608 { SA_ONSTACK, "SA_ONSTACK" },
609 { SA_OLDSTYLE, "SA_OLDSTYLE" },
610 #endif
611 { 0, NULL }
612 };
614 for (idx = 0; flaginfo[idx].s && remaining > 1; idx++) {
615 if (flags & flaginfo[idx].i) {
616 if (first) {
617 jio_snprintf(p, remaining, "%s", flaginfo[idx].s);
618 first = false;
619 } else {
620 jio_snprintf(p, remaining, "|%s", flaginfo[idx].s);
621 }
622 const size_t len = strlen(p);
623 p += len;
624 remaining -= len;
625 }
626 }
628 buffer[size - 1] = '\0';
630 return buffer;
631 }
633 // Prints one-line description of a combination of sigaction.sa_flags.
634 void os::Posix::print_sa_flags(outputStream* st, int flags) {
635 char buffer[0x100];
636 os::Posix::describe_sa_flags(flags, buffer, sizeof(buffer));
637 st->print("%s", buffer);
638 }
640 // Helper function for os::Posix::print_siginfo_...():
641 // return a textual description for signal code.
642 struct enum_sigcode_desc_t {
643 const char* s_name;
644 const char* s_desc;
645 };
647 static bool get_signal_code_description(const siginfo_t* si, enum_sigcode_desc_t* out) {
649 const struct {
650 int sig; int code; const char* s_code; const char* s_desc;
651 } t1 [] = {
652 { SIGILL, ILL_ILLOPC, "ILL_ILLOPC", "Illegal opcode." },
653 { SIGILL, ILL_ILLOPN, "ILL_ILLOPN", "Illegal operand." },
654 { SIGILL, ILL_ILLADR, "ILL_ILLADR", "Illegal addressing mode." },
655 { SIGILL, ILL_ILLTRP, "ILL_ILLTRP", "Illegal trap." },
656 { SIGILL, ILL_PRVOPC, "ILL_PRVOPC", "Privileged opcode." },
657 { SIGILL, ILL_PRVREG, "ILL_PRVREG", "Privileged register." },
658 { SIGILL, ILL_COPROC, "ILL_COPROC", "Coprocessor error." },
659 { SIGILL, ILL_BADSTK, "ILL_BADSTK", "Internal stack error." },
660 #if defined(IA64) && defined(LINUX)
661 { SIGILL, ILL_BADIADDR, "ILL_BADIADDR", "Unimplemented instruction address" },
662 { SIGILL, ILL_BREAK, "ILL_BREAK", "Application Break instruction" },
663 #endif
664 { SIGFPE, FPE_INTDIV, "FPE_INTDIV", "Integer divide by zero." },
665 { SIGFPE, FPE_INTOVF, "FPE_INTOVF", "Integer overflow." },
666 { SIGFPE, FPE_FLTDIV, "FPE_FLTDIV", "Floating-point divide by zero." },
667 { SIGFPE, FPE_FLTOVF, "FPE_FLTOVF", "Floating-point overflow." },
668 { SIGFPE, FPE_FLTUND, "FPE_FLTUND", "Floating-point underflow." },
669 { SIGFPE, FPE_FLTRES, "FPE_FLTRES", "Floating-point inexact result." },
670 { SIGFPE, FPE_FLTINV, "FPE_FLTINV", "Invalid floating-point operation." },
671 { SIGFPE, FPE_FLTSUB, "FPE_FLTSUB", "Subscript out of range." },
672 { SIGSEGV, SEGV_MAPERR, "SEGV_MAPERR", "Address not mapped to object." },
673 { SIGSEGV, SEGV_ACCERR, "SEGV_ACCERR", "Invalid permissions for mapped object." },
674 #ifdef AIX
675 // no explanation found what keyerr would be
676 { SIGSEGV, SEGV_KEYERR, "SEGV_KEYERR", "key error" },
677 #endif
678 #if defined(IA64) && !defined(AIX)
679 { SIGSEGV, SEGV_PSTKOVF, "SEGV_PSTKOVF", "Paragraph stack overflow" },
680 #endif
681 { SIGBUS, BUS_ADRALN, "BUS_ADRALN", "Invalid address alignment." },
682 { SIGBUS, BUS_ADRERR, "BUS_ADRERR", "Nonexistent physical address." },
683 { SIGBUS, BUS_OBJERR, "BUS_OBJERR", "Object-specific hardware error." },
684 { SIGTRAP, TRAP_BRKPT, "TRAP_BRKPT", "Process breakpoint." },
685 { SIGTRAP, TRAP_TRACE, "TRAP_TRACE", "Process trace trap." },
686 { SIGCHLD, CLD_EXITED, "CLD_EXITED", "Child has exited." },
687 { SIGCHLD, CLD_KILLED, "CLD_KILLED", "Child has terminated abnormally and did not create a core file." },
688 { SIGCHLD, CLD_DUMPED, "CLD_DUMPED", "Child has terminated abnormally and created a core file." },
689 { SIGCHLD, CLD_TRAPPED, "CLD_TRAPPED", "Traced child has trapped." },
690 { SIGCHLD, CLD_STOPPED, "CLD_STOPPED", "Child has stopped." },
691 { SIGCHLD, CLD_CONTINUED,"CLD_CONTINUED","Stopped child has continued." },
692 #ifdef SIGPOLL
693 { SIGPOLL, POLL_OUT, "POLL_OUT", "Output buffers available." },
694 { SIGPOLL, POLL_MSG, "POLL_MSG", "Input message available." },
695 { SIGPOLL, POLL_ERR, "POLL_ERR", "I/O error." },
696 { SIGPOLL, POLL_PRI, "POLL_PRI", "High priority input available." },
697 { SIGPOLL, POLL_HUP, "POLL_HUP", "Device disconnected. [Option End]" },
698 #endif
699 { -1, -1, NULL, NULL }
700 };
702 // Codes valid in any signal context.
703 const struct {
704 int code; const char* s_code; const char* s_desc;
705 } t2 [] = {
706 { SI_USER, "SI_USER", "Signal sent by kill()." },
707 { SI_QUEUE, "SI_QUEUE", "Signal sent by the sigqueue()." },
708 { SI_TIMER, "SI_TIMER", "Signal generated by expiration of a timer set by timer_settime()." },
709 { SI_ASYNCIO, "SI_ASYNCIO", "Signal generated by completion of an asynchronous I/O request." },
710 { SI_MESGQ, "SI_MESGQ", "Signal generated by arrival of a message on an empty message queue." },
711 // Linux specific
712 #ifdef SI_TKILL
713 { SI_TKILL, "SI_TKILL", "Signal sent by tkill (pthread_kill)" },
714 #endif
715 #ifdef SI_DETHREAD
716 { SI_DETHREAD, "SI_DETHREAD", "Signal sent by execve() killing subsidiary threads" },
717 #endif
718 #ifdef SI_KERNEL
719 { SI_KERNEL, "SI_KERNEL", "Signal sent by kernel." },
720 #endif
721 #ifdef SI_SIGIO
722 { SI_SIGIO, "SI_SIGIO", "Signal sent by queued SIGIO" },
723 #endif
725 #ifdef AIX
726 { SI_UNDEFINED, "SI_UNDEFINED","siginfo contains partial information" },
727 { SI_EMPTY, "SI_EMPTY", "siginfo contains no useful information" },
728 #endif
730 #ifdef __sun
731 { SI_NOINFO, "SI_NOINFO", "No signal information" },
732 { SI_RCTL, "SI_RCTL", "kernel generated signal via rctl action" },
733 { SI_LWP, "SI_LWP", "Signal sent via lwp_kill" },
734 #endif
736 { -1, NULL, NULL }
737 };
739 const char* s_code = NULL;
740 const char* s_desc = NULL;
742 for (int i = 0; t1[i].sig != -1; i ++) {
743 if (t1[i].sig == si->si_signo && t1[i].code == si->si_code) {
744 s_code = t1[i].s_code;
745 s_desc = t1[i].s_desc;
746 break;
747 }
748 }
750 if (s_code == NULL) {
751 for (int i = 0; t2[i].s_code != NULL; i ++) {
752 if (t2[i].code == si->si_code) {
753 s_code = t2[i].s_code;
754 s_desc = t2[i].s_desc;
755 }
756 }
757 }
759 if (s_code == NULL) {
760 out->s_name = "unknown";
761 out->s_desc = "unknown";
762 return false;
763 }
765 out->s_name = s_code;
766 out->s_desc = s_desc;
768 return true;
769 }
771 // A POSIX conform, platform-independend siginfo print routine.
772 // Short print out on one line.
773 void os::Posix::print_siginfo_brief(outputStream* os, const siginfo_t* si) {
774 char buf[20];
775 os->print("siginfo: ");
777 if (!si) {
778 os->print("<null>");
779 return;
780 }
782 // See print_siginfo_full() for details.
783 const int sig = si->si_signo;
785 os->print("si_signo: %d (%s)", sig, os::Posix::get_signal_name(sig, buf, sizeof(buf)));
787 enum_sigcode_desc_t ed;
788 if (get_signal_code_description(si, &ed)) {
789 os->print(", si_code: %d (%s)", si->si_code, ed.s_name);
790 } else {
791 os->print(", si_code: %d (unknown)", si->si_code);
792 }
794 if (si->si_errno) {
795 os->print(", si_errno: %d", si->si_errno);
796 }
798 const int me = (int) ::getpid();
799 const int pid = (int) si->si_pid;
801 if (si->si_code == SI_USER || si->si_code == SI_QUEUE) {
802 if (IS_VALID_PID(pid) && pid != me) {
803 os->print(", sent from pid: %d (uid: %d)", pid, (int) si->si_uid);
804 }
805 } else if (sig == SIGSEGV || sig == SIGBUS || sig == SIGILL ||
806 sig == SIGTRAP || sig == SIGFPE) {
807 os->print(", si_addr: " PTR_FORMAT, si->si_addr);
808 #ifdef SIGPOLL
809 } else if (sig == SIGPOLL) {
810 os->print(", si_band: " PTR64_FORMAT, (uint64_t)si->si_band);
811 #endif
812 } else if (sig == SIGCHLD) {
813 os->print_cr(", si_pid: %d, si_uid: %d, si_status: %d", (int) si->si_pid, si->si_uid, si->si_status);
814 }
815 }
817 os::WatcherThreadCrashProtection::WatcherThreadCrashProtection() {
818 assert(Thread::current()->is_Watcher_thread(), "Must be WatcherThread");
819 }
821 /*
822 * See the caveats for this class in os_posix.hpp
823 * Protects the callback call so that SIGSEGV / SIGBUS jumps back into this
824 * method and returns false. If none of the signals are raised, returns true.
825 * The callback is supposed to provide the method that should be protected.
826 */
827 bool os::WatcherThreadCrashProtection::call(os::CrashProtectionCallback& cb) {
828 sigset_t saved_sig_mask;
830 assert(Thread::current()->is_Watcher_thread(), "Only for WatcherThread");
831 assert(!WatcherThread::watcher_thread()->has_crash_protection(),
832 "crash_protection already set?");
834 // we cannot rely on sigsetjmp/siglongjmp to save/restore the signal mask
835 // since on at least some systems (OS X) siglongjmp will restore the mask
836 // for the process, not the thread
837 pthread_sigmask(0, NULL, &saved_sig_mask);
838 if (sigsetjmp(_jmpbuf, 0) == 0) {
839 // make sure we can see in the signal handler that we have crash protection
840 // installed
841 WatcherThread::watcher_thread()->set_crash_protection(this);
842 cb.call();
843 // and clear the crash protection
844 WatcherThread::watcher_thread()->set_crash_protection(NULL);
845 return true;
846 }
847 // this happens when we siglongjmp() back
848 pthread_sigmask(SIG_SETMASK, &saved_sig_mask, NULL);
849 WatcherThread::watcher_thread()->set_crash_protection(NULL);
850 return false;
851 }
853 void os::WatcherThreadCrashProtection::restore() {
854 assert(WatcherThread::watcher_thread()->has_crash_protection(),
855 "must have crash protection");
857 siglongjmp(_jmpbuf, 1);
858 }
860 void os::WatcherThreadCrashProtection::check_crash_protection(int sig,
861 Thread* thread) {
863 if (thread != NULL &&
864 thread->is_Watcher_thread() &&
865 WatcherThread::watcher_thread()->has_crash_protection()) {
867 if (sig == SIGSEGV || sig == SIGBUS) {
868 WatcherThread::watcher_thread()->crash_protection()->restore();
869 }
870 }
871 }
