1 /*
2 * Copyright (c) 1999, 2019, 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 */
24
25 // no precompiled headers
26 #include "jvm.h"
27 #include "classfile/classLoader.hpp"
28 #include "classfile/systemDictionary.hpp"
29 #include "classfile/vmSymbols.hpp"
30 #include "code/icBuffer.hpp"
31 #include "code/vtableStubs.hpp"
32 #include "compiler/compileBroker.hpp"
33 #include "compiler/disassembler.hpp"
34 #include "interpreter/interpreter.hpp"
35 #include "logging/log.hpp"
36 #include "logging/logStream.hpp"
37 #include "memory/allocation.inline.hpp"
38 #include "memory/filemap.hpp"
39 #include "oops/oop.inline.hpp"
40 #include "os_bsd.inline.hpp"
41 #include "os_posix.inline.hpp"
42 #include "os_share_bsd.hpp"
43 #include "prims/jniFastGetField.hpp"
44 #include "prims/jvm_misc.hpp"
45 #include "runtime/arguments.hpp"
46 #include "runtime/atomic.hpp"
47 #include "runtime/extendedPC.hpp"
48 #include "runtime/globals.hpp"
49 #include "runtime/interfaceSupport.inline.hpp"
50 #include "runtime/java.hpp"
51 #include "runtime/javaCalls.hpp"
52 #include "runtime/mutexLocker.hpp"
53 #include "runtime/objectMonitor.hpp"
54 #include "runtime/osThread.hpp"
55 #include "runtime/perfMemory.hpp"
56 #include "runtime/semaphore.hpp"
57 #include "runtime/sharedRuntime.hpp"
58 #include "runtime/statSampler.hpp"
59 #include "runtime/stubRoutines.hpp"
60 #include "runtime/thread.inline.hpp"
61 #include "runtime/threadCritical.hpp"
62 #include "runtime/timer.hpp"
63 #include "services/attachListener.hpp"
64 #include "services/memTracker.hpp"
65 #include "services/runtimeService.hpp"
66 #include "utilities/align.hpp"
67 #include "utilities/decoder.hpp"
68 #include "utilities/defaultStream.hpp"
69 #include "utilities/events.hpp"
70 #include "utilities/growableArray.hpp"
71 #include "utilities/vmError.hpp"
72
73 // put OS-includes here
74 # include <dlfcn.h>
75 # include <errno.h>
76 # include <fcntl.h>
77 # include <inttypes.h>
78 # include <poll.h>
79 # include <pthread.h>
80 # include <pwd.h>
81 # include <signal.h>
82 # include <stdint.h>
83 # include <stdio.h>
84 # include <string.h>
85 # include <sys/ioctl.h>
86 # include <sys/mman.h>
87 # include <sys/param.h>
88 # include <sys/resource.h>
89 # include <sys/socket.h>
90 # include <sys/stat.h>
91 # include <sys/syscall.h>
92 # include <sys/sysctl.h>
93 # include <sys/time.h>
94 # include <sys/times.h>
95 # include <sys/types.h>
96 # include <sys/wait.h>
97 # include <time.h>
98 # include <unistd.h>
99
100 #if defined(__FreeBSD__) || defined(__NetBSD__)
101 #include <elf.h>
102 #endif
103
104 #ifdef __APPLE__
105 #include <mach-o/dyld.h>
106 #endif
107
108 #ifndef MAP_ANONYMOUS
109 #define MAP_ANONYMOUS MAP_ANON
110 #endif
111
112 #define MAX_PATH (2 * K)
113
114 // for timer info max values which include all bits
115 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF)
116
117 ////////////////////////////////////////////////////////////////////////////////
118 // global variables
119 julong os::Bsd::_physical_memory = 0;
120
121 #ifdef __APPLE__
122 mach_timebase_info_data_t os::Bsd::_timebase_info = {0, 0};
123 volatile uint64_t os::Bsd::_max_abstime = 0;
124 #else
125 int (*os::Bsd::_clock_gettime)(clockid_t, struct timespec *) = NULL;
126 #endif
127 pthread_t os::Bsd::_main_thread;
128 int os::Bsd::_page_size = -1;
129
130 static jlong initial_time_count=0;
131
132 static int clock_tics_per_sec = 100;
133
134 // For diagnostics to print a message once. see run_periodic_checks
135 static sigset_t check_signal_done;
136 static bool check_signals = true;
137
138 // Signal number used to suspend/resume a thread
139
140 // do not use any signal number less than SIGSEGV, see 4355769
141 static int SR_signum = SIGUSR2;
142 sigset_t SR_sigset;
143
144
145 ////////////////////////////////////////////////////////////////////////////////
146 // utility functions
147
148 static int SR_initialize();
149
150 julong os::available_memory() {
151 return Bsd::available_memory();
152 }
153
154 // available here means free
155 julong os::Bsd::available_memory() {
156 uint64_t available = physical_memory() >> 2;
157 #ifdef __APPLE__
158 mach_msg_type_number_t count = HOST_VM_INFO64_COUNT;
159 vm_statistics64_data_t vmstat;
160 kern_return_t kerr = host_statistics64(mach_host_self(), HOST_VM_INFO64,
161 (host_info64_t)&vmstat, &count);
162 assert(kerr == KERN_SUCCESS,
163 "host_statistics64 failed - check mach_host_self() and count");
164 if (kerr == KERN_SUCCESS) {
165 available = vmstat.free_count * os::vm_page_size();
166 }
167 #endif
168 return available;
169 }
170
171 julong os::physical_memory() {
172 return Bsd::physical_memory();
173 }
174
175 // Return true if user is running as root.
176
177 bool os::have_special_privileges() {
178 static bool init = false;
179 static bool privileges = false;
180 if (!init) {
181 privileges = (getuid() != geteuid()) || (getgid() != getegid());
182 init = true;
183 }
184 return privileges;
185 }
186
187
188
189 // Cpu architecture string
190 #if defined(ZERO)
191 static char cpu_arch[] = ZERO_LIBARCH;
192 #elif defined(IA64)
193 static char cpu_arch[] = "ia64";
194 #elif defined(IA32)
195 static char cpu_arch[] = "i386";
196 #elif defined(AMD64)
197 static char cpu_arch[] = "amd64";
198 #elif defined(ARM)
199 static char cpu_arch[] = "arm";
200 #elif defined(PPC32)
201 static char cpu_arch[] = "ppc";
202 #elif defined(SPARC)
203 #ifdef _LP64
204 static char cpu_arch[] = "sparcv9";
205 #else
206 static char cpu_arch[] = "sparc";
207 #endif
208 #else
209 #error Add appropriate cpu_arch setting
210 #endif
211
212 // Compiler variant
213 #ifdef COMPILER2
214 #define COMPILER_VARIANT "server"
215 #else
216 #define COMPILER_VARIANT "client"
217 #endif
218
219
220 void os::Bsd::initialize_system_info() {
221 int mib[2];
222 size_t len;
223 int cpu_val;
224 julong mem_val;
225
226 // get processors count via hw.ncpus sysctl
227 mib[0] = CTL_HW;
228 mib[1] = HW_NCPU;
229 len = sizeof(cpu_val);
230 if (sysctl(mib, 2, &cpu_val, &len, NULL, 0) != -1 && cpu_val >= 1) {
231 assert(len == sizeof(cpu_val), "unexpected data size");
232 set_processor_count(cpu_val);
233 } else {
234 set_processor_count(1); // fallback
235 }
236
237 // get physical memory via hw.memsize sysctl (hw.memsize is used
238 // since it returns a 64 bit value)
239 mib[0] = CTL_HW;
240
241 #if defined (HW_MEMSIZE) // Apple
242 mib[1] = HW_MEMSIZE;
243 #elif defined(HW_PHYSMEM) // Most of BSD
244 mib[1] = HW_PHYSMEM;
245 #elif defined(HW_REALMEM) // Old FreeBSD
246 mib[1] = HW_REALMEM;
247 #else
248 #error No ways to get physmem
249 #endif
250
251 len = sizeof(mem_val);
252 if (sysctl(mib, 2, &mem_val, &len, NULL, 0) != -1) {
253 assert(len == sizeof(mem_val), "unexpected data size");
254 _physical_memory = mem_val;
255 } else {
256 _physical_memory = 256 * 1024 * 1024; // fallback (XXXBSD?)
257 }
258
259 #ifdef __OpenBSD__
260 {
261 // limit _physical_memory memory view on OpenBSD since
262 // datasize rlimit restricts us anyway.
263 struct rlimit limits;
264 getrlimit(RLIMIT_DATA, &limits);
265 _physical_memory = MIN2(_physical_memory, (julong)limits.rlim_cur);
266 }
267 #endif
268 }
269
270 #ifdef __APPLE__
271 static const char *get_home() {
272 const char *home_dir = ::getenv("HOME");
273 if ((home_dir == NULL) || (*home_dir == '\0')) {
274 struct passwd *passwd_info = getpwuid(geteuid());
275 if (passwd_info != NULL) {
276 home_dir = passwd_info->pw_dir;
277 }
278 }
279
280 return home_dir;
281 }
282 #endif
283
284 void os::init_system_properties_values() {
285 // The next steps are taken in the product version:
286 //
287 // Obtain the JAVA_HOME value from the location of libjvm.so.
288 // This library should be located at:
289 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm.so.
290 //
291 // If "/jre/lib/" appears at the right place in the path, then we
292 // assume libjvm.so is installed in a JDK and we use this path.
293 //
294 // Otherwise exit with message: "Could not create the Java virtual machine."
295 //
296 // The following extra steps are taken in the debugging version:
297 //
298 // If "/jre/lib/" does NOT appear at the right place in the path
299 // instead of exit check for $JAVA_HOME environment variable.
300 //
301 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>,
302 // then we append a fake suffix "hotspot/libjvm.so" to this path so
303 // it looks like libjvm.so is installed there
304 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm.so.
305 //
306 // Otherwise exit.
307 //
308 // Important note: if the location of libjvm.so changes this
309 // code needs to be changed accordingly.
310
311 // See ld(1):
312 // The linker uses the following search paths to locate required
313 // shared libraries:
314 // 1: ...
315 // ...
316 // 7: The default directories, normally /lib and /usr/lib.
317 #ifndef DEFAULT_LIBPATH
318 #ifndef OVERRIDE_LIBPATH
319 #define DEFAULT_LIBPATH "/lib:/usr/lib"
320 #else
321 #define DEFAULT_LIBPATH OVERRIDE_LIBPATH
322 #endif
323 #endif
324
325 // Base path of extensions installed on the system.
326 #define SYS_EXT_DIR "/usr/java/packages"
327 #define EXTENSIONS_DIR "/lib/ext"
328
329 #ifndef __APPLE__
330
331 // Buffer that fits several sprintfs.
332 // Note that the space for the colon and the trailing null are provided
333 // by the nulls included by the sizeof operator.
334 const size_t bufsize =
335 MAX2((size_t)MAXPATHLEN, // For dll_dir & friends.
336 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR) + sizeof(SYS_EXT_DIR) + sizeof(EXTENSIONS_DIR)); // extensions dir
337 char *buf = NEW_C_HEAP_ARRAY(char, bufsize, mtInternal);
338
339 // sysclasspath, java_home, dll_dir
340 {
341 char *pslash;
342 os::jvm_path(buf, bufsize);
343
344 // Found the full path to libjvm.so.
345 // Now cut the path to <java_home>/jre if we can.
346 *(strrchr(buf, '/')) = '\0'; // Get rid of /libjvm.so.
347 pslash = strrchr(buf, '/');
348 if (pslash != NULL) {
349 *pslash = '\0'; // Get rid of /{client|server|hotspot}.
350 }
351 Arguments::set_dll_dir(buf);
352
353 if (pslash != NULL) {
354 pslash = strrchr(buf, '/');
355 if (pslash != NULL) {
356 *pslash = '\0'; // Get rid of /<arch>.
357 pslash = strrchr(buf, '/');
358 if (pslash != NULL) {
359 *pslash = '\0'; // Get rid of /lib.
360 }
361 }
362 }
363 Arguments::set_java_home(buf);
364 if (!set_boot_path('/', ':')) {
365 vm_exit_during_initialization("Failed setting boot class path.", NULL);
366 }
367 }
368
369 // Where to look for native libraries.
370 //
371 // Note: Due to a legacy implementation, most of the library path
372 // is set in the launcher. This was to accomodate linking restrictions
373 // on legacy Bsd implementations (which are no longer supported).
374 // Eventually, all the library path setting will be done here.
375 //
376 // However, to prevent the proliferation of improperly built native
377 // libraries, the new path component /usr/java/packages is added here.
378 // Eventually, all the library path setting will be done here.
379 {
380 // Get the user setting of LD_LIBRARY_PATH, and prepended it. It
381 // should always exist (until the legacy problem cited above is
382 // addressed).
383 const char *v = ::getenv("LD_LIBRARY_PATH");
384 const char *v_colon = ":";
385 if (v == NULL) { v = ""; v_colon = ""; }
386 // That's +1 for the colon and +1 for the trailing '\0'.
387 char *ld_library_path = NEW_C_HEAP_ARRAY(char,
388 strlen(v) + 1 +
389 sizeof(SYS_EXT_DIR) + sizeof("/lib/") + strlen(cpu_arch) + sizeof(DEFAULT_LIBPATH) + 1,
390 mtInternal);
391 sprintf(ld_library_path, "%s%s" SYS_EXT_DIR "/lib/%s:" DEFAULT_LIBPATH, v, v_colon, cpu_arch);
392 Arguments::set_library_path(ld_library_path);
393 FREE_C_HEAP_ARRAY(char, ld_library_path);
394 }
395
396 // Extensions directories.
397 sprintf(buf, "%s" EXTENSIONS_DIR ":" SYS_EXT_DIR EXTENSIONS_DIR, Arguments::get_java_home());
398 Arguments::set_ext_dirs(buf);
399
400 FREE_C_HEAP_ARRAY(char, buf);
401
402 #else // __APPLE__
403
404 #define SYS_EXTENSIONS_DIR "/Library/Java/Extensions"
405 #define SYS_EXTENSIONS_DIRS SYS_EXTENSIONS_DIR ":/Network" SYS_EXTENSIONS_DIR ":/System" SYS_EXTENSIONS_DIR ":/usr/lib/java"
406
407 const char *user_home_dir = get_home();
408 // The null in SYS_EXTENSIONS_DIRS counts for the size of the colon after user_home_dir.
409 size_t system_ext_size = strlen(user_home_dir) + sizeof(SYS_EXTENSIONS_DIR) +
410 sizeof(SYS_EXTENSIONS_DIRS);
411
412 // Buffer that fits several sprintfs.
413 // Note that the space for the colon and the trailing null are provided
414 // by the nulls included by the sizeof operator.
415 const size_t bufsize =
416 MAX2((size_t)MAXPATHLEN, // for dll_dir & friends.
417 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR) + system_ext_size); // extensions dir
418 char *buf = NEW_C_HEAP_ARRAY(char, bufsize, mtInternal);
419
420 // sysclasspath, java_home, dll_dir
421 {
422 char *pslash;
423 os::jvm_path(buf, bufsize);
424
425 // Found the full path to libjvm.so.
426 // Now cut the path to <java_home>/jre if we can.
427 *(strrchr(buf, '/')) = '\0'; // Get rid of /libjvm.so.
428 pslash = strrchr(buf, '/');
429 if (pslash != NULL) {
430 *pslash = '\0'; // Get rid of /{client|server|hotspot}.
431 }
432 #ifdef STATIC_BUILD
433 strcat(buf, "/lib");
434 #endif
435
436 Arguments::set_dll_dir(buf);
437
438 if (pslash != NULL) {
439 pslash = strrchr(buf, '/');
440 if (pslash != NULL) {
441 *pslash = '\0'; // Get rid of /lib.
442 }
443 }
444 Arguments::set_java_home(buf);
445 set_boot_path('/', ':');
446 }
447
448 // Where to look for native libraries.
449 //
450 // Note: Due to a legacy implementation, most of the library path
451 // is set in the launcher. This was to accomodate linking restrictions
452 // on legacy Bsd implementations (which are no longer supported).
453 // Eventually, all the library path setting will be done here.
454 //
455 // However, to prevent the proliferation of improperly built native
456 // libraries, the new path component /usr/java/packages is added here.
457 // Eventually, all the library path setting will be done here.
458 {
459 // Get the user setting of LD_LIBRARY_PATH, and prepended it. It
460 // should always exist (until the legacy problem cited above is
461 // addressed).
462 // Prepend the default path with the JAVA_LIBRARY_PATH so that the app launcher code
463 // can specify a directory inside an app wrapper
464 const char *l = ::getenv("JAVA_LIBRARY_PATH");
465 const char *l_colon = ":";
466 if (l == NULL) { l = ""; l_colon = ""; }
467
468 const char *v = ::getenv("DYLD_LIBRARY_PATH");
469 const char *v_colon = ":";
470 if (v == NULL) { v = ""; v_colon = ""; }
471
472 // Apple's Java6 has "." at the beginning of java.library.path.
473 // OpenJDK on Windows has "." at the end of java.library.path.
474 // OpenJDK on Linux and Solaris don't have "." in java.library.path
475 // at all. To ease the transition from Apple's Java6 to OpenJDK7,
476 // "." is appended to the end of java.library.path. Yes, this
477 // could cause a change in behavior, but Apple's Java6 behavior
478 // can be achieved by putting "." at the beginning of the
479 // JAVA_LIBRARY_PATH environment variable.
480 char *ld_library_path = NEW_C_HEAP_ARRAY(char,
481 strlen(v) + 1 + strlen(l) + 1 +
482 system_ext_size + 3,
483 mtInternal);
484 sprintf(ld_library_path, "%s%s%s%s%s" SYS_EXTENSIONS_DIR ":" SYS_EXTENSIONS_DIRS ":.",
485 v, v_colon, l, l_colon, user_home_dir);
486 Arguments::set_library_path(ld_library_path);
487 FREE_C_HEAP_ARRAY(char, ld_library_path);
488 }
489
490 // Extensions directories.
491 //
492 // Note that the space for the colon and the trailing null are provided
493 // by the nulls included by the sizeof operator (so actually one byte more
494 // than necessary is allocated).
495 sprintf(buf, "%s" SYS_EXTENSIONS_DIR ":%s" EXTENSIONS_DIR ":" SYS_EXTENSIONS_DIRS,
496 user_home_dir, Arguments::get_java_home());
497 Arguments::set_ext_dirs(buf);
498
499 FREE_C_HEAP_ARRAY(char, buf);
500
501 #undef SYS_EXTENSIONS_DIR
502 #undef SYS_EXTENSIONS_DIRS
503
504 #endif // __APPLE__
505
506 #undef SYS_EXT_DIR
507 #undef EXTENSIONS_DIR
508 }
509
510 ////////////////////////////////////////////////////////////////////////////////
511 // breakpoint support
512
513 void os::breakpoint() {
514 BREAKPOINT;
515 }
516
517 extern "C" void breakpoint() {
518 // use debugger to set breakpoint here
519 }
520
521 ////////////////////////////////////////////////////////////////////////////////
522 // signal support
523
524 debug_only(static bool signal_sets_initialized = false);
525 static sigset_t unblocked_sigs, vm_sigs;
526
527 void os::Bsd::signal_sets_init() {
528 // Should also have an assertion stating we are still single-threaded.
529 assert(!signal_sets_initialized, "Already initialized");
530 // Fill in signals that are necessarily unblocked for all threads in
531 // the VM. Currently, we unblock the following signals:
532 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden
533 // by -Xrs (=ReduceSignalUsage));
534 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all
535 // other threads. The "ReduceSignalUsage" boolean tells us not to alter
536 // the dispositions or masks wrt these signals.
537 // Programs embedding the VM that want to use the above signals for their
538 // own purposes must, at this time, use the "-Xrs" option to prevent
539 // interference with shutdown hooks and BREAK_SIGNAL thread dumping.
540 // (See bug 4345157, and other related bugs).
541 // In reality, though, unblocking these signals is really a nop, since
542 // these signals are not blocked by default.
543 sigemptyset(&unblocked_sigs);
544 sigaddset(&unblocked_sigs, SIGILL);
545 sigaddset(&unblocked_sigs, SIGSEGV);
546 sigaddset(&unblocked_sigs, SIGBUS);
547 sigaddset(&unblocked_sigs, SIGFPE);
548 sigaddset(&unblocked_sigs, SR_signum);
549
550 if (!ReduceSignalUsage) {
551 if (!os::Posix::is_sig_ignored(SHUTDOWN1_SIGNAL)) {
552 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL);
553
554 }
555 if (!os::Posix::is_sig_ignored(SHUTDOWN2_SIGNAL)) {
556 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL);
557 }
558 if (!os::Posix::is_sig_ignored(SHUTDOWN3_SIGNAL)) {
559 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL);
560 }
561 }
562 // Fill in signals that are blocked by all but the VM thread.
563 sigemptyset(&vm_sigs);
564 if (!ReduceSignalUsage) {
565 sigaddset(&vm_sigs, BREAK_SIGNAL);
566 }
567 debug_only(signal_sets_initialized = true);
568
569 }
570
571 // These are signals that are unblocked while a thread is running Java.
572 // (For some reason, they get blocked by default.)
573 sigset_t* os::Bsd::unblocked_signals() {
574 assert(signal_sets_initialized, "Not initialized");
575 return &unblocked_sigs;
576 }
577
578 // These are the signals that are blocked while a (non-VM) thread is
579 // running Java. Only the VM thread handles these signals.
580 sigset_t* os::Bsd::vm_signals() {
581 assert(signal_sets_initialized, "Not initialized");
582 return &vm_sigs;
583 }
584
585 void os::Bsd::hotspot_sigmask(Thread* thread) {
586
587 //Save caller's signal mask before setting VM signal mask
588 sigset_t caller_sigmask;
589 pthread_sigmask(SIG_BLOCK, NULL, &caller_sigmask);
590
591 OSThread* osthread = thread->osthread();
592 osthread->set_caller_sigmask(caller_sigmask);
593
594 pthread_sigmask(SIG_UNBLOCK, os::Bsd::unblocked_signals(), NULL);
595
596 if (!ReduceSignalUsage) {
597 if (thread->is_VM_thread()) {
598 // Only the VM thread handles BREAK_SIGNAL ...
599 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL);
600 } else {
601 // ... all other threads block BREAK_SIGNAL
602 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL);
603 }
604 }
605 }
606
607
608 //////////////////////////////////////////////////////////////////////////////
609 // create new thread
610
611 #ifdef __APPLE__
612 // library handle for calling objc_registerThreadWithCollector()
613 // without static linking to the libobjc library
614 #define OBJC_LIB "/usr/lib/libobjc.dylib"
615 #define OBJC_GCREGISTER "objc_registerThreadWithCollector"
616 typedef void (*objc_registerThreadWithCollector_t)();
617 extern "C" objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction;
618 objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction = NULL;
619 #endif
620
621 #ifdef __APPLE__
622 static uint64_t locate_unique_thread_id(mach_port_t mach_thread_port) {
623 // Additional thread_id used to correlate threads in SA
624 thread_identifier_info_data_t m_ident_info;
625 mach_msg_type_number_t count = THREAD_IDENTIFIER_INFO_COUNT;
626
627 thread_info(mach_thread_port, THREAD_IDENTIFIER_INFO,
628 (thread_info_t) &m_ident_info, &count);
629
630 return m_ident_info.thread_id;
631 }
632 #endif
633
634 // Thread start routine for all newly created threads
635 static void *thread_native_entry(Thread *thread) {
636
637 thread->record_stack_base_and_size();
638
639 // Try to randomize the cache line index of hot stack frames.
640 // This helps when threads of the same stack traces evict each other's
641 // cache lines. The threads can be either from the same JVM instance, or
642 // from different JVM instances. The benefit is especially true for
643 // processors with hyperthreading technology.
644 static int counter = 0;
645 int pid = os::current_process_id();
646 alloca(((pid ^ counter++) & 7) * 128);
647
648 thread->initialize_thread_current();
649
650 OSThread* osthread = thread->osthread();
651 Monitor* sync = osthread->startThread_lock();
652
653 osthread->set_thread_id(os::Bsd::gettid());
654
655 log_info(os, thread)("Thread is alive (tid: " UINTX_FORMAT ", pthread id: " UINTX_FORMAT ").",
656 os::current_thread_id(), (uintx) pthread_self());
657
658 #ifdef __APPLE__
659 uint64_t unique_thread_id = locate_unique_thread_id(osthread->thread_id());
660 guarantee(unique_thread_id != 0, "unique thread id was not found");
661 osthread->set_unique_thread_id(unique_thread_id);
662 #endif
663 // initialize signal mask for this thread
664 os::Bsd::hotspot_sigmask(thread);
665
666 // initialize floating point control register
667 os::Bsd::init_thread_fpu_state();
668
669 #ifdef __APPLE__
670 // register thread with objc gc
671 if (objc_registerThreadWithCollectorFunction != NULL) {
672 objc_registerThreadWithCollectorFunction();
673 }
674 #endif
675
676 // handshaking with parent thread
677 {
678 MutexLocker ml(sync, Mutex::_no_safepoint_check_flag);
679
680 // notify parent thread
681 osthread->set_state(INITIALIZED);
682 sync->notify_all();
683
684 // wait until os::start_thread()
685 while (osthread->get_state() == INITIALIZED) {
686 sync->wait_without_safepoint_check();
687 }
688 }
689
690 // call one more level start routine
691 thread->call_run();
692
693 // Note: at this point the thread object may already have deleted itself.
694 // Prevent dereferencing it from here on out.
695 thread = NULL;
696
697 log_info(os, thread)("Thread finished (tid: " UINTX_FORMAT ", pthread id: " UINTX_FORMAT ").",
698 os::current_thread_id(), (uintx) pthread_self());
699
700 return 0;
701 }
702
703 bool os::create_thread(Thread* thread, ThreadType thr_type,
704 size_t req_stack_size) {
705 assert(thread->osthread() == NULL, "caller responsible");
706
707 // Allocate the OSThread object
708 OSThread* osthread = new OSThread(NULL, NULL);
709 if (osthread == NULL) {
710 return false;
711 }
712
713 // set the correct thread state
714 osthread->set_thread_type(thr_type);
715
716 // Initial state is ALLOCATED but not INITIALIZED
717 osthread->set_state(ALLOCATED);
718
719 thread->set_osthread(osthread);
720
721 // init thread attributes
722 pthread_attr_t attr;
723 pthread_attr_init(&attr);
724 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
725
726 // calculate stack size if it's not specified by caller
727 size_t stack_size = os::Posix::get_initial_stack_size(thr_type, req_stack_size);
728 int status = pthread_attr_setstacksize(&attr, stack_size);
729 assert_status(status == 0, status, "pthread_attr_setstacksize");
730
731 ThreadState state;
732
733 {
734 pthread_t tid;
735 int ret = pthread_create(&tid, &attr, (void* (*)(void*)) thread_native_entry, thread);
736
737 char buf[64];
738 if (ret == 0) {
739 log_info(os, thread)("Thread started (pthread id: " UINTX_FORMAT ", attributes: %s). ",
740 (uintx) tid, os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr));
741 } else {
742 log_warning(os, thread)("Failed to start thread - pthread_create failed (%s) for attributes: %s.",
743 os::errno_name(ret), os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr));
744 // Log some OS information which might explain why creating the thread failed.
745 log_info(os, thread)("Number of threads approx. running in the VM: %d", Threads::number_of_threads());
746 LogStream st(Log(os, thread)::info());
747 os::Posix::print_rlimit_info(&st);
748 os::print_memory_info(&st);
749 }
750
751 pthread_attr_destroy(&attr);
752
753 if (ret != 0) {
754 // Need to clean up stuff we've allocated so far
755 thread->set_osthread(NULL);
756 delete osthread;
757 return false;
758 }
759
760 // Store pthread info into the OSThread
761 osthread->set_pthread_id(tid);
762
763 // Wait until child thread is either initialized or aborted
764 {
765 Monitor* sync_with_child = osthread->startThread_lock();
766 MutexLocker ml(sync_with_child, Mutex::_no_safepoint_check_flag);
767 while ((state = osthread->get_state()) == ALLOCATED) {
768 sync_with_child->wait_without_safepoint_check();
769 }
770 }
771
772 }
773
774 // Aborted due to thread limit being reached
775 if (state == ZOMBIE) {
776 thread->set_osthread(NULL);
777 delete osthread;
778 return false;
779 }
780
781 // The thread is returned suspended (in state INITIALIZED),
782 // and is started higher up in the call chain
783 assert(state == INITIALIZED, "race condition");
784 return true;
785 }
786
787 /////////////////////////////////////////////////////////////////////////////
788 // attach existing thread
789
790 // bootstrap the main thread
791 bool os::create_main_thread(JavaThread* thread) {
792 assert(os::Bsd::_main_thread == pthread_self(), "should be called inside main thread");
793 return create_attached_thread(thread);
794 }
795
796 bool os::create_attached_thread(JavaThread* thread) {
797 #ifdef ASSERT
798 thread->verify_not_published();
799 #endif
800
801 // Allocate the OSThread object
802 OSThread* osthread = new OSThread(NULL, NULL);
803
804 if (osthread == NULL) {
805 return false;
806 }
807
808 osthread->set_thread_id(os::Bsd::gettid());
809
810 // Store pthread info into the OSThread
811 #ifdef __APPLE__
812 uint64_t unique_thread_id = locate_unique_thread_id(osthread->thread_id());
813 guarantee(unique_thread_id != 0, "just checking");
814 osthread->set_unique_thread_id(unique_thread_id);
815 #endif
816 osthread->set_pthread_id(::pthread_self());
817
818 // initialize floating point control register
819 os::Bsd::init_thread_fpu_state();
820
821 // Initial thread state is RUNNABLE
822 osthread->set_state(RUNNABLE);
823
824 thread->set_osthread(osthread);
825
826 // initialize signal mask for this thread
827 // and save the caller's signal mask
828 os::Bsd::hotspot_sigmask(thread);
829
830 log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ", pthread id: " UINTX_FORMAT ").",
831 os::current_thread_id(), (uintx) pthread_self());
832
833 return true;
834 }
835
836 void os::pd_start_thread(Thread* thread) {
837 OSThread * osthread = thread->osthread();
838 assert(osthread->get_state() != INITIALIZED, "just checking");
839 Monitor* sync_with_child = osthread->startThread_lock();
840 MutexLocker ml(sync_with_child, Mutex::_no_safepoint_check_flag);
841 sync_with_child->notify();
842 }
843
844 // Free Bsd resources related to the OSThread
845 void os::free_thread(OSThread* osthread) {
846 assert(osthread != NULL, "osthread not set");
847
848 // We are told to free resources of the argument thread,
849 // but we can only really operate on the current thread.
850 assert(Thread::current()->osthread() == osthread,
851 "os::free_thread but not current thread");
852
853 // Restore caller's signal mask
854 sigset_t sigmask = osthread->caller_sigmask();
855 pthread_sigmask(SIG_SETMASK, &sigmask, NULL);
856
857 delete osthread;
858 }
859
860 ////////////////////////////////////////////////////////////////////////////////
861 // time support
862
863 // Time since start-up in seconds to a fine granularity.
864 // Used by VMSelfDestructTimer and the MemProfiler.
865 double os::elapsedTime() {
866
867 return ((double)os::elapsed_counter()) / os::elapsed_frequency();
868 }
869
870 jlong os::elapsed_counter() {
871 return javaTimeNanos() - initial_time_count;
872 }
873
874 jlong os::elapsed_frequency() {
875 return NANOSECS_PER_SEC; // nanosecond resolution
876 }
877
878 bool os::supports_vtime() { return true; }
879
880 double os::elapsedVTime() {
881 // better than nothing, but not much
882 return elapsedTime();
883 }
884
885 jlong os::javaTimeMillis() {
886 timeval time;
887 int status = gettimeofday(&time, NULL);
888 assert(status != -1, "bsd error");
889 return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000);
890 }
891
892 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) {
893 timeval time;
894 int status = gettimeofday(&time, NULL);
895 assert(status != -1, "bsd error");
896 seconds = jlong(time.tv_sec);
897 nanos = jlong(time.tv_usec) * 1000;
898 }
899
900 #ifndef __APPLE__
901 #ifndef CLOCK_MONOTONIC
902 #define CLOCK_MONOTONIC (1)
903 #endif
904 #endif
905
906 #ifdef __APPLE__
907 void os::Bsd::clock_init() {
908 mach_timebase_info(&_timebase_info);
909 }
910 #else
911 void os::Bsd::clock_init() {
912 struct timespec res;
913 struct timespec tp;
914 if (::clock_getres(CLOCK_MONOTONIC, &res) == 0 &&
915 ::clock_gettime(CLOCK_MONOTONIC, &tp) == 0) {
916 // yes, monotonic clock is supported
917 _clock_gettime = ::clock_gettime;
918 }
919 }
920 #endif
921
922
923
924 #ifdef __APPLE__
925
926 jlong os::javaTimeNanos() {
927 const uint64_t tm = mach_absolute_time();
928 const uint64_t now = (tm * Bsd::_timebase_info.numer) / Bsd::_timebase_info.denom;
929 const uint64_t prev = Bsd::_max_abstime;
930 if (now <= prev) {
931 return prev; // same or retrograde time;
932 }
933 const uint64_t obsv = Atomic::cmpxchg(now, &Bsd::_max_abstime, prev);
934 assert(obsv >= prev, "invariant"); // Monotonicity
935 // If the CAS succeeded then we're done and return "now".
936 // If the CAS failed and the observed value "obsv" is >= now then
937 // we should return "obsv". If the CAS failed and now > obsv > prv then
938 // some other thread raced this thread and installed a new value, in which case
939 // we could either (a) retry the entire operation, (b) retry trying to install now
940 // or (c) just return obsv. We use (c). No loop is required although in some cases
941 // we might discard a higher "now" value in deference to a slightly lower but freshly
942 // installed obsv value. That's entirely benign -- it admits no new orderings compared
943 // to (a) or (b) -- and greatly reduces coherence traffic.
944 // We might also condition (c) on the magnitude of the delta between obsv and now.
945 // Avoiding excessive CAS operations to hot RW locations is critical.
946 // See https://blogs.oracle.com/dave/entry/cas_and_cache_trivia_invalidate
947 return (prev == obsv) ? now : obsv;
948 }
949
950 #else // __APPLE__
951
952 jlong os::javaTimeNanos() {
953 if (os::supports_monotonic_clock()) {
954 struct timespec tp;
955 int status = Bsd::_clock_gettime(CLOCK_MONOTONIC, &tp);
956 assert(status == 0, "gettime error");
957 jlong result = jlong(tp.tv_sec) * (1000 * 1000 * 1000) + jlong(tp.tv_nsec);
958 return result;
959 } else {
960 timeval time;
961 int status = gettimeofday(&time, NULL);
962 assert(status != -1, "bsd error");
963 jlong usecs = jlong(time.tv_sec) * (1000 * 1000) + jlong(time.tv_usec);
964 return 1000 * usecs;
965 }
966 }
967
968 #endif // __APPLE__
969
970 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
971 if (os::supports_monotonic_clock()) {
972 info_ptr->max_value = ALL_64_BITS;
973
974 // CLOCK_MONOTONIC - amount of time since some arbitrary point in the past
975 info_ptr->may_skip_backward = false; // not subject to resetting or drifting
976 info_ptr->may_skip_forward = false; // not subject to resetting or drifting
977 } else {
978 // gettimeofday - based on time in seconds since the Epoch thus does not wrap
979 info_ptr->max_value = ALL_64_BITS;
980
981 // gettimeofday is a real time clock so it skips
982 info_ptr->may_skip_backward = true;
983 info_ptr->may_skip_forward = true;
984 }
985
986 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
987 }
988
989 // Return the real, user, and system times in seconds from an
990 // arbitrary fixed point in the past.
991 bool os::getTimesSecs(double* process_real_time,
992 double* process_user_time,
993 double* process_system_time) {
994 struct tms ticks;
995 clock_t real_ticks = times(&ticks);
996
997 if (real_ticks == (clock_t) (-1)) {
998 return false;
999 } else {
1000 double ticks_per_second = (double) clock_tics_per_sec;
1001 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second;
1002 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second;
1003 *process_real_time = ((double) real_ticks) / ticks_per_second;
1004
1005 return true;
1006 }
1007 }
1008
1009
1010 char * os::local_time_string(char *buf, size_t buflen) {
1011 struct tm t;
1012 time_t long_time;
1013 time(&long_time);
1014 localtime_r(&long_time, &t);
1015 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
1016 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday,
1017 t.tm_hour, t.tm_min, t.tm_sec);
1018 return buf;
1019 }
1020
1021 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
1022 return localtime_r(clock, res);
1023 }
1024
1025 ////////////////////////////////////////////////////////////////////////////////
1026 // runtime exit support
1027
1028 // Note: os::shutdown() might be called very early during initialization, or
1029 // called from signal handler. Before adding something to os::shutdown(), make
1030 // sure it is async-safe and can handle partially initialized VM.
1031 void os::shutdown() {
1032
1033 // allow PerfMemory to attempt cleanup of any persistent resources
1034 perfMemory_exit();
1035
1036 // needs to remove object in file system
1037 AttachListener::abort();
1038
1039 // flush buffered output, finish log files
1040 ostream_abort();
1041
1042 // Check for abort hook
1043 abort_hook_t abort_hook = Arguments::abort_hook();
1044 if (abort_hook != NULL) {
1045 abort_hook();
1046 }
1047
1048 }
1049
1050 // Note: os::abort() might be called very early during initialization, or
1051 // called from signal handler. Before adding something to os::abort(), make
1052 // sure it is async-safe and can handle partially initialized VM.
1053 void os::abort(bool dump_core, void* siginfo, const void* context) {
1054 os::shutdown();
1055 if (dump_core) {
1056 #ifndef PRODUCT
1057 fdStream out(defaultStream::output_fd());
1058 out.print_raw("Current thread is ");
1059 char buf[16];
1060 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id());
1061 out.print_raw_cr(buf);
1062 out.print_raw_cr("Dumping core ...");
1063 #endif
1064 ::abort(); // dump core
1065 }
1066
1067 ::exit(1);
1068 }
1069
1070 // Die immediately, no exit hook, no abort hook, no cleanup.
1071 // Dump a core file, if possible, for debugging.
1072 void os::die() {
1073 if (TestUnresponsiveErrorHandler && !CreateCoredumpOnCrash) {
1074 // For TimeoutInErrorHandlingTest.java, we just kill the VM
1075 // and don't take the time to generate a core file.
1076 os::signal_raise(SIGKILL);
1077 } else {
1078 // _exit() on BsdThreads only kills current thread
1079 ::abort();
1080 }
1081 }
1082
1083 // Information of current thread in variety of formats
1084 pid_t os::Bsd::gettid() {
1085 int retval = -1;
1086
1087 #ifdef __APPLE__ //XNU kernel
1088 // despite the fact mach port is actually not a thread id use it
1089 // instead of syscall(SYS_thread_selfid) as it certainly fits to u4
1090 retval = ::pthread_mach_thread_np(::pthread_self());
1091 guarantee(retval != 0, "just checking");
1092 return retval;
1093
1094 #else
1095 #ifdef __FreeBSD__
1096 retval = syscall(SYS_thr_self);
1097 #else
1098 #ifdef __OpenBSD__
1099 retval = syscall(SYS_getthrid);
1100 #else
1101 #ifdef __NetBSD__
1102 retval = (pid_t) syscall(SYS__lwp_self);
1103 #endif
1104 #endif
1105 #endif
1106 #endif
1107
1108 if (retval == -1) {
1109 return getpid();
1110 }
1111 }
1112
1113 intx os::current_thread_id() {
1114 #ifdef __APPLE__
1115 return (intx)::pthread_mach_thread_np(::pthread_self());
1116 #else
1117 return (intx)::pthread_self();
1118 #endif
1119 }
1120
1121 int os::current_process_id() {
1122 return (int)(getpid());
1123 }
1124
1125 // DLL functions
1126
1127 const char* os::dll_file_extension() { return JNI_LIB_SUFFIX; }
1128
1129 // This must be hard coded because it's the system's temporary
1130 // directory not the java application's temp directory, ala java.io.tmpdir.
1131 #ifdef __APPLE__
1132 // macosx has a secure per-user temporary directory
1133 char temp_path_storage[PATH_MAX];
1134 const char* os::get_temp_directory() {
1135 static char *temp_path = NULL;
1136 if (temp_path == NULL) {
1137 int pathSize = confstr(_CS_DARWIN_USER_TEMP_DIR, temp_path_storage, PATH_MAX);
1138 if (pathSize == 0 || pathSize > PATH_MAX) {
1139 strlcpy(temp_path_storage, "/tmp/", sizeof(temp_path_storage));
1140 }
1141 temp_path = temp_path_storage;
1142 }
1143 return temp_path;
1144 }
1145 #else // __APPLE__
1146 const char* os::get_temp_directory() { return "/tmp"; }
1147 #endif // __APPLE__
1148
1149 // check if addr is inside libjvm.so
1150 bool os::address_is_in_vm(address addr) {
1151 static address libjvm_base_addr;
1152 Dl_info dlinfo;
1153
1154 if (libjvm_base_addr == NULL) {
1155 if (dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo) != 0) {
1156 libjvm_base_addr = (address)dlinfo.dli_fbase;
1157 }
1158 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm");
1159 }
1160
1161 if (dladdr((void *)addr, &dlinfo) != 0) {
1162 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true;
1163 }
1164
1165 return false;
1166 }
1167
1168
1169 #define MACH_MAXSYMLEN 256
1170
1171 bool os::dll_address_to_function_name(address addr, char *buf,
1172 int buflen, int *offset,
1173 bool demangle) {
1174 // buf is not optional, but offset is optional
1175 assert(buf != NULL, "sanity check");
1176
1177 Dl_info dlinfo;
1178 char localbuf[MACH_MAXSYMLEN];
1179
1180 if (dladdr((void*)addr, &dlinfo) != 0) {
1181 // see if we have a matching symbol
1182 if (dlinfo.dli_saddr != NULL && dlinfo.dli_sname != NULL) {
1183 if (!(demangle && Decoder::demangle(dlinfo.dli_sname, buf, buflen))) {
1184 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname);
1185 }
1186 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr;
1187 return true;
1188 }
1189 // no matching symbol so try for just file info
1190 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) {
1191 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase),
1192 buf, buflen, offset, dlinfo.dli_fname, demangle)) {
1193 return true;
1194 }
1195 }
1196
1197 // Handle non-dynamic manually:
1198 if (dlinfo.dli_fbase != NULL &&
1199 Decoder::decode(addr, localbuf, MACH_MAXSYMLEN, offset,
1200 dlinfo.dli_fbase)) {
1201 if (!(demangle && Decoder::demangle(localbuf, buf, buflen))) {
1202 jio_snprintf(buf, buflen, "%s", localbuf);
1203 }
1204 return true;
1205 }
1206 }
1207 buf[0] = '\0';
1208 if (offset != NULL) *offset = -1;
1209 return false;
1210 }
1211
1212 // ported from solaris version
1213 bool os::dll_address_to_library_name(address addr, char* buf,
1214 int buflen, int* offset) {
1215 // buf is not optional, but offset is optional
1216 assert(buf != NULL, "sanity check");
1217
1218 Dl_info dlinfo;
1219
1220 if (dladdr((void*)addr, &dlinfo) != 0) {
1221 if (dlinfo.dli_fname != NULL) {
1222 jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname);
1223 }
1224 if (dlinfo.dli_fbase != NULL && offset != NULL) {
1225 *offset = addr - (address)dlinfo.dli_fbase;
1226 }
1227 return true;
1228 }
1229
1230 buf[0] = '\0';
1231 if (offset) *offset = -1;
1232 return false;
1233 }
1234
1235 // Loads .dll/.so and
1236 // in case of error it checks if .dll/.so was built for the
1237 // same architecture as Hotspot is running on
1238
1239 #ifdef __APPLE__
1240 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) {
1241 #ifdef STATIC_BUILD
1242 return os::get_default_process_handle();
1243 #else
1244 log_info(os)("attempting shared library load of %s", filename);
1245
1246 void * result= ::dlopen(filename, RTLD_LAZY);
1247 if (result != NULL) {
1248 Events::log(NULL, "Loaded shared library %s", filename);
1249 // Successful loading
1250 log_info(os)("shared library load of %s was successful", filename);
1251 return result;
1252 }
1253
1254 const char* error_report = ::dlerror();
1255 if (error_report == NULL) {
1256 error_report = "dlerror returned no error description";
1257 }
1258 if (ebuf != NULL && ebuflen > 0) {
1259 // Read system error message into ebuf
1260 ::strncpy(ebuf, error_report, ebuflen-1);
1261 ebuf[ebuflen-1]='\0';
1262 }
1263 Events::log(NULL, "Loading shared library %s failed, %s", filename, error_report);
1264 log_info(os)("shared library load of %s failed, %s", filename, error_report);
1265
1266 return NULL;
1267 #endif // STATIC_BUILD
1268 }
1269 #else
1270 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) {
1271 #ifdef STATIC_BUILD
1272 return os::get_default_process_handle();
1273 #else
1274 log_info(os)("attempting shared library load of %s", filename);
1275 void * result= ::dlopen(filename, RTLD_LAZY);
1276 if (result != NULL) {
1277 Events::log(NULL, "Loaded shared library %s", filename);
1278 // Successful loading
1279 log_info(os)("shared library load of %s was successful", filename);
1280 return result;
1281 }
1282
1283 Elf32_Ehdr elf_head;
1284
1285 const char* const error_report = ::dlerror();
1286 if (error_report == NULL) {
1287 error_report = "dlerror returned no error description";
1288 }
1289 if (ebuf != NULL && ebuflen > 0) {
1290 // Read system error message into ebuf
1291 ::strncpy(ebuf, error_report, ebuflen-1);
1292 ebuf[ebuflen-1]='\0';
1293 }
1294 Events::log(NULL, "Loading shared library %s failed, %s", filename, error_report);
1295 log_info(os)("shared library load of %s failed, %s", filename, error_report);
1296
1297 int diag_msg_max_length=ebuflen-strlen(ebuf);
1298 char* diag_msg_buf=ebuf+strlen(ebuf);
1299
1300 if (diag_msg_max_length==0) {
1301 // No more space in ebuf for additional diagnostics message
1302 return NULL;
1303 }
1304
1305
1306 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK);
1307
1308 if (file_descriptor < 0) {
1309 // Can't open library, report dlerror() message
1310 return NULL;
1311 }
1312
1313 bool failed_to_read_elf_head=
1314 (sizeof(elf_head)!=
1315 (::read(file_descriptor, &elf_head,sizeof(elf_head))));
1316
1317 ::close(file_descriptor);
1318 if (failed_to_read_elf_head) {
1319 // file i/o error - report dlerror() msg
1320 return NULL;
1321 }
1322
1323 typedef struct {
1324 Elf32_Half code; // Actual value as defined in elf.h
1325 Elf32_Half compat_class; // Compatibility of archs at VM's sense
1326 char elf_class; // 32 or 64 bit
1327 char endianess; // MSB or LSB
1328 char* name; // String representation
1329 } arch_t;
1330
1331 #ifndef EM_486
1332 #define EM_486 6 /* Intel 80486 */
1333 #endif
1334
1335 #ifndef EM_MIPS_RS3_LE
1336 #define EM_MIPS_RS3_LE 10 /* MIPS */
1337 #endif
1338
1339 #ifndef EM_PPC64
1340 #define EM_PPC64 21 /* PowerPC64 */
1341 #endif
1342
1343 #ifndef EM_S390
1344 #define EM_S390 22 /* IBM System/390 */
1345 #endif
1346
1347 #ifndef EM_IA_64
1348 #define EM_IA_64 50 /* HP/Intel IA-64 */
1349 #endif
1350
1351 #ifndef EM_X86_64
1352 #define EM_X86_64 62 /* AMD x86-64 */
1353 #endif
1354
1355 static const arch_t arch_array[]={
1356 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
1357 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
1358 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"},
1359 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"},
1360 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
1361 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
1362 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"},
1363 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"},
1364 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"},
1365 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM"},
1366 {EM_S390, EM_S390, ELFCLASSNONE, ELFDATA2MSB, (char*)"IBM System/390"},
1367 {EM_ALPHA, EM_ALPHA, ELFCLASS64, ELFDATA2LSB, (char*)"Alpha"},
1368 {EM_MIPS_RS3_LE, EM_MIPS_RS3_LE, ELFCLASS32, ELFDATA2LSB, (char*)"MIPSel"},
1369 {EM_MIPS, EM_MIPS, ELFCLASS32, ELFDATA2MSB, (char*)"MIPS"},
1370 {EM_PARISC, EM_PARISC, ELFCLASS32, ELFDATA2MSB, (char*)"PARISC"},
1371 {EM_68K, EM_68K, ELFCLASS32, ELFDATA2MSB, (char*)"M68k"}
1372 };
1373
1374 #if (defined IA32)
1375 static Elf32_Half running_arch_code=EM_386;
1376 #elif (defined AMD64)
1377 static Elf32_Half running_arch_code=EM_X86_64;
1378 #elif (defined IA64)
1379 static Elf32_Half running_arch_code=EM_IA_64;
1380 #elif (defined __sparc) && (defined _LP64)
1381 static Elf32_Half running_arch_code=EM_SPARCV9;
1382 #elif (defined __sparc) && (!defined _LP64)
1383 static Elf32_Half running_arch_code=EM_SPARC;
1384 #elif (defined __powerpc64__)
1385 static Elf32_Half running_arch_code=EM_PPC64;
1386 #elif (defined __powerpc__)
1387 static Elf32_Half running_arch_code=EM_PPC;
1388 #elif (defined ARM)
1389 static Elf32_Half running_arch_code=EM_ARM;
1390 #elif (defined S390)
1391 static Elf32_Half running_arch_code=EM_S390;
1392 #elif (defined ALPHA)
1393 static Elf32_Half running_arch_code=EM_ALPHA;
1394 #elif (defined MIPSEL)
1395 static Elf32_Half running_arch_code=EM_MIPS_RS3_LE;
1396 #elif (defined PARISC)
1397 static Elf32_Half running_arch_code=EM_PARISC;
1398 #elif (defined MIPS)
1399 static Elf32_Half running_arch_code=EM_MIPS;
1400 #elif (defined M68K)
1401 static Elf32_Half running_arch_code=EM_68K;
1402 #else
1403 #error Method os::dll_load requires that one of following is defined:\
1404 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, S390, ALPHA, MIPS, MIPSEL, PARISC, M68K
1405 #endif
1406
1407 // Identify compatability class for VM's architecture and library's architecture
1408 // Obtain string descriptions for architectures
1409
1410 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL};
1411 int running_arch_index=-1;
1412
1413 for (unsigned int i=0; i < ARRAY_SIZE(arch_array); i++) {
1414 if (running_arch_code == arch_array[i].code) {
1415 running_arch_index = i;
1416 }
1417 if (lib_arch.code == arch_array[i].code) {
1418 lib_arch.compat_class = arch_array[i].compat_class;
1419 lib_arch.name = arch_array[i].name;
1420 }
1421 }
1422
1423 assert(running_arch_index != -1,
1424 "Didn't find running architecture code (running_arch_code) in arch_array");
1425 if (running_arch_index == -1) {
1426 // Even though running architecture detection failed
1427 // we may still continue with reporting dlerror() message
1428 return NULL;
1429 }
1430
1431 if (lib_arch.endianess != arch_array[running_arch_index].endianess) {
1432 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)");
1433 return NULL;
1434 }
1435
1436 #ifndef S390
1437 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) {
1438 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)");
1439 return NULL;
1440 }
1441 #endif // !S390
1442
1443 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) {
1444 if (lib_arch.name!=NULL) {
1445 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
1446 " (Possible cause: can't load %s-bit .so on a %s-bit platform)",
1447 lib_arch.name, arch_array[running_arch_index].name);
1448 } else {
1449 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
1450 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)",
1451 lib_arch.code,
1452 arch_array[running_arch_index].name);
1453 }
1454 }
1455
1456 return NULL;
1457 #endif // STATIC_BUILD
1458 }
1459 #endif // !__APPLE__
1460
1461 void* os::get_default_process_handle() {
1462 #ifdef __APPLE__
1463 // MacOS X needs to use RTLD_FIRST instead of RTLD_LAZY
1464 // to avoid finding unexpected symbols on second (or later)
1465 // loads of a library.
1466 return (void*)::dlopen(NULL, RTLD_FIRST);
1467 #else
1468 return (void*)::dlopen(NULL, RTLD_LAZY);
1469 #endif
1470 }
1471
1472 // XXX: Do we need a lock around this as per Linux?
1473 void* os::dll_lookup(void* handle, const char* name) {
1474 return dlsym(handle, name);
1475 }
1476
1477 int _print_dll_info_cb(const char * name, address base_address, address top_address, void * param) {
1478 outputStream * out = (outputStream *) param;
1479 out->print_cr(INTPTR_FORMAT " \t%s", (intptr_t)base_address, name);
1480 return 0;
1481 }
1482
1483 void os::print_dll_info(outputStream *st) {
1484 st->print_cr("Dynamic libraries:");
1485 if (get_loaded_modules_info(_print_dll_info_cb, (void *)st)) {
1486 st->print_cr("Error: Cannot print dynamic libraries.");
1487 }
1488 }
1489
1490 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) {
1491 #ifdef RTLD_DI_LINKMAP
1492 Dl_info dli;
1493 void *handle;
1494 Link_map *map;
1495 Link_map *p;
1496
1497 if (dladdr(CAST_FROM_FN_PTR(void *, os::print_dll_info), &dli) == 0 ||
1498 dli.dli_fname == NULL) {
1499 return 1;
1500 }
1501 handle = dlopen(dli.dli_fname, RTLD_LAZY);
1502 if (handle == NULL) {
1503 return 1;
1504 }
1505 dlinfo(handle, RTLD_DI_LINKMAP, &map);
1506 if (map == NULL) {
1507 dlclose(handle);
1508 return 1;
1509 }
1510
1511 while (map->l_prev != NULL)
1512 map = map->l_prev;
1513
1514 while (map != NULL) {
1515 // Value for top_address is returned as 0 since we don't have any information about module size
1516 if (callback(map->l_name, (address)map->l_addr, (address)0, param)) {
1517 dlclose(handle);
1518 return 1;
1519 }
1520 map = map->l_next;
1521 }
1522
1523 dlclose(handle);
1524 #elif defined(__APPLE__)
1525 for (uint32_t i = 1; i < _dyld_image_count(); i++) {
1526 // Value for top_address is returned as 0 since we don't have any information about module size
1527 if (callback(_dyld_get_image_name(i), (address)_dyld_get_image_header(i), (address)0, param)) {
1528 return 1;
1529 }
1530 }
1531 return 0;
1532 #else
1533 return 1;
1534 #endif
1535 }
1536
1537 void os::get_summary_os_info(char* buf, size_t buflen) {
1538 // These buffers are small because we want this to be brief
1539 // and not use a lot of stack while generating the hs_err file.
1540 char os[100];
1541 size_t size = sizeof(os);
1542 int mib_kern[] = { CTL_KERN, KERN_OSTYPE };
1543 if (sysctl(mib_kern, 2, os, &size, NULL, 0) < 0) {
1544 #ifdef __APPLE__
1545 strncpy(os, "Darwin", sizeof(os));
1546 #elif __OpenBSD__
1547 strncpy(os, "OpenBSD", sizeof(os));
1548 #else
1549 strncpy(os, "BSD", sizeof(os));
1550 #endif
1551 }
1552
1553 char release[100];
1554 size = sizeof(release);
1555 int mib_release[] = { CTL_KERN, KERN_OSRELEASE };
1556 if (sysctl(mib_release, 2, release, &size, NULL, 0) < 0) {
1557 // if error, leave blank
1558 strncpy(release, "", sizeof(release));
1559 }
1560 snprintf(buf, buflen, "%s %s", os, release);
1561 }
1562
1563 void os::print_os_info_brief(outputStream* st) {
1564 os::Posix::print_uname_info(st);
1565 }
1566
1567 void os::print_os_info(outputStream* st) {
1568 st->print("OS:");
1569
1570 os::Posix::print_uname_info(st);
1571
1572 os::Posix::print_rlimit_info(st);
1573
1574 os::Posix::print_load_average(st);
1575 }
1576
1577 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) {
1578 // Nothing to do for now.
1579 }
1580
1581 void os::get_summary_cpu_info(char* buf, size_t buflen) {
1582 unsigned int mhz;
1583 size_t size = sizeof(mhz);
1584 int mib[] = { CTL_HW, HW_CPU_FREQ };
1585 if (sysctl(mib, 2, &mhz, &size, NULL, 0) < 0) {
1586 mhz = 1; // looks like an error but can be divided by
1587 } else {
1588 mhz /= 1000000; // reported in millions
1589 }
1590
1591 char model[100];
1592 size = sizeof(model);
1593 int mib_model[] = { CTL_HW, HW_MODEL };
1594 if (sysctl(mib_model, 2, model, &size, NULL, 0) < 0) {
1595 strncpy(model, cpu_arch, sizeof(model));
1596 }
1597
1598 char machine[100];
1599 size = sizeof(machine);
1600 int mib_machine[] = { CTL_HW, HW_MACHINE };
1601 if (sysctl(mib_machine, 2, machine, &size, NULL, 0) < 0) {
1602 strncpy(machine, "", sizeof(machine));
1603 }
1604
1605 snprintf(buf, buflen, "%s %s %d MHz", model, machine, mhz);
1606 }
1607
1608 void os::print_memory_info(outputStream* st) {
1609 xsw_usage swap_usage;
1610 size_t size = sizeof(swap_usage);
1611
1612 st->print("Memory:");
1613 st->print(" %dk page", os::vm_page_size()>>10);
1614
1615 st->print(", physical " UINT64_FORMAT "k",
1616 os::physical_memory() >> 10);
1617 st->print("(" UINT64_FORMAT "k free)",
1618 os::available_memory() >> 10);
1619
1620 if((sysctlbyname("vm.swapusage", &swap_usage, &size, NULL, 0) == 0) || (errno == ENOMEM)) {
1621 if (size >= offset_of(xsw_usage, xsu_used)) {
1622 st->print(", swap " UINT64_FORMAT "k",
1623 ((julong) swap_usage.xsu_total) >> 10);
1624 st->print("(" UINT64_FORMAT "k free)",
1625 ((julong) swap_usage.xsu_avail) >> 10);
1626 }
1627 }
1628
1629 st->cr();
1630 }
1631
1632 static void print_signal_handler(outputStream* st, int sig,
1633 char* buf, size_t buflen);
1634
1635 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1636 st->print_cr("Signal Handlers:");
1637 print_signal_handler(st, SIGSEGV, buf, buflen);
1638 print_signal_handler(st, SIGBUS , buf, buflen);
1639 print_signal_handler(st, SIGFPE , buf, buflen);
1640 print_signal_handler(st, SIGPIPE, buf, buflen);
1641 print_signal_handler(st, SIGXFSZ, buf, buflen);
1642 print_signal_handler(st, SIGILL , buf, buflen);
1643 print_signal_handler(st, SR_signum, buf, buflen);
1644 print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen);
1645 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen);
1646 print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen);
1647 print_signal_handler(st, BREAK_SIGNAL, buf, buflen);
1648 }
1649
1650 static char saved_jvm_path[MAXPATHLEN] = {0};
1651
1652 // Find the full path to the current module, libjvm
1653 void os::jvm_path(char *buf, jint buflen) {
1654 // Error checking.
1655 if (buflen < MAXPATHLEN) {
1656 assert(false, "must use a large-enough buffer");
1657 buf[0] = '\0';
1658 return;
1659 }
1660 // Lazy resolve the path to current module.
1661 if (saved_jvm_path[0] != 0) {
1662 strcpy(buf, saved_jvm_path);
1663 return;
1664 }
1665
1666 char dli_fname[MAXPATHLEN];
1667 bool ret = dll_address_to_library_name(
1668 CAST_FROM_FN_PTR(address, os::jvm_path),
1669 dli_fname, sizeof(dli_fname), NULL);
1670 assert(ret, "cannot locate libjvm");
1671 char *rp = NULL;
1672 if (ret && dli_fname[0] != '\0') {
1673 rp = os::Posix::realpath(dli_fname, buf, buflen);
1674 }
1675 if (rp == NULL) {
1676 return;
1677 }
1678
1679 if (Arguments::sun_java_launcher_is_altjvm()) {
1680 // Support for the java launcher's '-XXaltjvm=<path>' option. Typical
1681 // value for buf is "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so"
1682 // or "<JAVA_HOME>/jre/lib/<vmtype>/libjvm.dylib". If "/jre/lib/"
1683 // appears at the right place in the string, then assume we are
1684 // installed in a JDK and we're done. Otherwise, check for a
1685 // JAVA_HOME environment variable and construct a path to the JVM
1686 // being overridden.
1687
1688 const char *p = buf + strlen(buf) - 1;
1689 for (int count = 0; p > buf && count < 5; ++count) {
1690 for (--p; p > buf && *p != '/'; --p)
1691 /* empty */ ;
1692 }
1693
1694 if (strncmp(p, "/jre/lib/", 9) != 0) {
1695 // Look for JAVA_HOME in the environment.
1696 char* java_home_var = ::getenv("JAVA_HOME");
1697 if (java_home_var != NULL && java_home_var[0] != 0) {
1698 char* jrelib_p;
1699 int len;
1700
1701 // Check the current module name "libjvm"
1702 p = strrchr(buf, '/');
1703 assert(strstr(p, "/libjvm") == p, "invalid library name");
1704
1705 rp = os::Posix::realpath(java_home_var, buf, buflen);
1706 if (rp == NULL) {
1707 return;
1708 }
1709
1710 // determine if this is a legacy image or modules image
1711 // modules image doesn't have "jre" subdirectory
1712 len = strlen(buf);
1713 assert(len < buflen, "Ran out of buffer space");
1714 jrelib_p = buf + len;
1715
1716 // Add the appropriate library subdir
1717 snprintf(jrelib_p, buflen-len, "/jre/lib");
1718 if (0 != access(buf, F_OK)) {
1719 snprintf(jrelib_p, buflen-len, "/lib");
1720 }
1721
1722 // Add the appropriate client or server subdir
1723 len = strlen(buf);
1724 jrelib_p = buf + len;
1725 snprintf(jrelib_p, buflen-len, "/%s", COMPILER_VARIANT);
1726 if (0 != access(buf, F_OK)) {
1727 snprintf(jrelib_p, buflen-len, "%s", "");
1728 }
1729
1730 // If the path exists within JAVA_HOME, add the JVM library name
1731 // to complete the path to JVM being overridden. Otherwise fallback
1732 // to the path to the current library.
1733 if (0 == access(buf, F_OK)) {
1734 // Use current module name "libjvm"
1735 len = strlen(buf);
1736 snprintf(buf + len, buflen-len, "/libjvm%s", JNI_LIB_SUFFIX);
1737 } else {
1738 // Fall back to path of current library
1739 rp = os::Posix::realpath(dli_fname, buf, buflen);
1740 if (rp == NULL) {
1741 return;
1742 }
1743 }
1744 }
1745 }
1746 }
1747
1748 strncpy(saved_jvm_path, buf, MAXPATHLEN);
1749 saved_jvm_path[MAXPATHLEN - 1] = '\0';
1750 }
1751
1752 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1753 // no prefix required, not even "_"
1754 }
1755
1756 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1757 // no suffix required
1758 }
1759
1760 ////////////////////////////////////////////////////////////////////////////////
1761 // sun.misc.Signal support
1762
1763 static void UserHandler(int sig, void *siginfo, void *context) {
1764 // Ctrl-C is pressed during error reporting, likely because the error
1765 // handler fails to abort. Let VM die immediately.
1766 if (sig == SIGINT && VMError::is_error_reported()) {
1767 os::die();
1768 }
1769
1770 os::signal_notify(sig);
1771 }
1772
1773 void* os::user_handler() {
1774 return CAST_FROM_FN_PTR(void*, UserHandler);
1775 }
1776
1777 extern "C" {
1778 typedef void (*sa_handler_t)(int);
1779 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *);
1780 }
1781
1782 void* os::signal(int signal_number, void* handler) {
1783 struct sigaction sigAct, oldSigAct;
1784
1785 sigfillset(&(sigAct.sa_mask));
1786 sigAct.sa_flags = SA_RESTART|SA_SIGINFO;
1787 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler);
1788
1789 if (sigaction(signal_number, &sigAct, &oldSigAct)) {
1790 // -1 means registration failed
1791 return (void *)-1;
1792 }
1793
1794 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler);
1795 }
1796
1797 void os::signal_raise(int signal_number) {
1798 ::raise(signal_number);
1799 }
1800
1801 // The following code is moved from os.cpp for making this
1802 // code platform specific, which it is by its very nature.
1803
1804 // Will be modified when max signal is changed to be dynamic
1805 int os::sigexitnum_pd() {
1806 return NSIG;
1807 }
1808
1809 // a counter for each possible signal value
1810 static volatile jint pending_signals[NSIG+1] = { 0 };
1811 static Semaphore* sig_sem = NULL;
1812
1813 static void jdk_misc_signal_init() {
1814 // Initialize signal structures
1815 ::memset((void*)pending_signals, 0, sizeof(pending_signals));
1816
1817 // Initialize signal semaphore
1818 sig_sem = new Semaphore();
1819 }
1820
1821 void os::signal_notify(int sig) {
1822 if (sig_sem != NULL) {
1823 Atomic::inc(&pending_signals[sig]);
1824 sig_sem->signal();
1825 } else {
1826 // Signal thread is not created with ReduceSignalUsage and jdk_misc_signal_init
1827 // initialization isn't called.
1828 assert(ReduceSignalUsage, "signal semaphore should be created");
1829 }
1830 }
1831
1832 static int check_pending_signals() {
1833 for (;;) {
1834 for (int i = 0; i < NSIG + 1; i++) {
1835 jint n = pending_signals[i];
1836 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
1837 return i;
1838 }
1839 }
1840 JavaThread *thread = JavaThread::current();
1841 ThreadBlockInVM tbivm(thread);
1842
1843 bool threadIsSuspended;
1844 do {
1845 thread->set_suspend_equivalent();
1846 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
1847 sig_sem->wait();
1848
1849 // were we externally suspended while we were waiting?
1850 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
1851 if (threadIsSuspended) {
1852 // The semaphore has been incremented, but while we were waiting
1853 // another thread suspended us. We don't want to continue running
1854 // while suspended because that would surprise the thread that
1855 // suspended us.
1856 sig_sem->signal();
1857
1858 thread->java_suspend_self();
1859 }
1860 } while (threadIsSuspended);
1861 }
1862 }
1863
1864 int os::signal_wait() {
1865 return check_pending_signals();
1866 }
1867
1868 ////////////////////////////////////////////////////////////////////////////////
1869 // Virtual Memory
1870
1871 int os::vm_page_size() {
1872 // Seems redundant as all get out
1873 assert(os::Bsd::page_size() != -1, "must call os::init");
1874 return os::Bsd::page_size();
1875 }
1876
1877 // Solaris allocates memory by pages.
1878 int os::vm_allocation_granularity() {
1879 assert(os::Bsd::page_size() != -1, "must call os::init");
1880 return os::Bsd::page_size();
1881 }
1882
1883 // Rationale behind this function:
1884 // current (Mon Apr 25 20:12:18 MSD 2005) oprofile drops samples without executable
1885 // mapping for address (see lookup_dcookie() in the kernel module), thus we cannot get
1886 // samples for JITted code. Here we create private executable mapping over the code cache
1887 // and then we can use standard (well, almost, as mapping can change) way to provide
1888 // info for the reporting script by storing timestamp and location of symbol
1889 void bsd_wrap_code(char* base, size_t size) {
1890 static volatile jint cnt = 0;
1891
1892 if (!UseOprofile) {
1893 return;
1894 }
1895
1896 char buf[PATH_MAX + 1];
1897 int num = Atomic::add(1, &cnt);
1898
1899 snprintf(buf, PATH_MAX + 1, "%s/hs-vm-%d-%d",
1900 os::get_temp_directory(), os::current_process_id(), num);
1901 unlink(buf);
1902
1903 int fd = ::open(buf, O_CREAT | O_RDWR, S_IRWXU);
1904
1905 if (fd != -1) {
1906 off_t rv = ::lseek(fd, size-2, SEEK_SET);
1907 if (rv != (off_t)-1) {
1908 if (::write(fd, "", 1) == 1) {
1909 mmap(base, size,
1910 PROT_READ|PROT_WRITE|PROT_EXEC,
1911 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE, fd, 0);
1912 }
1913 }
1914 ::close(fd);
1915 unlink(buf);
1916 }
1917 }
1918
1919 static void warn_fail_commit_memory(char* addr, size_t size, bool exec,
1920 int err) {
1921 warning("INFO: os::commit_memory(" INTPTR_FORMAT ", " SIZE_FORMAT
1922 ", %d) failed; error='%s' (errno=%d)", (intptr_t)addr, size, exec,
1923 os::errno_name(err), err);
1924 }
1925
1926 // NOTE: Bsd kernel does not really reserve the pages for us.
1927 // All it does is to check if there are enough free pages
1928 // left at the time of mmap(). This could be a potential
1929 // problem.
1930 bool os::pd_commit_memory(char* addr, size_t size, bool exec) {
1931 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE;
1932 #ifdef __OpenBSD__
1933 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD
1934 Events::log(NULL, "Protecting memory [" INTPTR_FORMAT "," INTPTR_FORMAT "] with protection modes %x", p2i(addr), p2i(addr+size), prot);
1935 if (::mprotect(addr, size, prot) == 0) {
1936 return true;
1937 }
1938 #else
1939 uintptr_t res = (uintptr_t) ::mmap(addr, size, prot,
1940 MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0);
1941 if (res != (uintptr_t) MAP_FAILED) {
1942 return true;
1943 }
1944 #endif
1945
1946 // Warn about any commit errors we see in non-product builds just
1947 // in case mmap() doesn't work as described on the man page.
1948 NOT_PRODUCT(warn_fail_commit_memory(addr, size, exec, errno);)
1949
1950 return false;
1951 }
1952
1953 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint,
1954 bool exec) {
1955 // alignment_hint is ignored on this OS
1956 return pd_commit_memory(addr, size, exec);
1957 }
1958
1959 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec,
1960 const char* mesg) {
1961 assert(mesg != NULL, "mesg must be specified");
1962 if (!pd_commit_memory(addr, size, exec)) {
1963 // add extra info in product mode for vm_exit_out_of_memory():
1964 PRODUCT_ONLY(warn_fail_commit_memory(addr, size, exec, errno);)
1965 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, "%s", mesg);
1966 }
1967 }
1968
1969 void os::pd_commit_memory_or_exit(char* addr, size_t size,
1970 size_t alignment_hint, bool exec,
1971 const char* mesg) {
1972 // alignment_hint is ignored on this OS
1973 pd_commit_memory_or_exit(addr, size, exec, mesg);
1974 }
1975
1976 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) {
1977 }
1978
1979 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) {
1980 ::madvise(addr, bytes, MADV_DONTNEED);
1981 }
1982
1983 void os::numa_make_global(char *addr, size_t bytes) {
1984 }
1985
1986 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) {
1987 }
1988
1989 bool os::numa_topology_changed() { return false; }
1990
1991 size_t os::numa_get_groups_num() {
1992 return 1;
1993 }
1994
1995 int os::numa_get_group_id() {
1996 return 0;
1997 }
1998
1999 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
2000 if (size > 0) {
2001 ids[0] = 0;
2002 return 1;
2003 }
2004 return 0;
2005 }
2006
2007 int os::numa_get_group_id_for_address(const void* address) {
2008 return 0;
2009 }
2010
2011 bool os::get_page_info(char *start, page_info* info) {
2012 return false;
2013 }
2014
2015 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) {
2016 return end;
2017 }
2018
2019
2020 bool os::pd_uncommit_memory(char* addr, size_t size) {
2021 #ifdef __OpenBSD__
2022 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD
2023 Events::log(NULL, "Protecting memory [" INTPTR_FORMAT "," INTPTR_FORMAT "] with PROT_NONE", p2i(addr), p2i(addr+size));
2024 return ::mprotect(addr, size, PROT_NONE) == 0;
2025 #else
2026 uintptr_t res = (uintptr_t) ::mmap(addr, size, PROT_NONE,
2027 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE|MAP_ANONYMOUS, -1, 0);
2028 return res != (uintptr_t) MAP_FAILED;
2029 #endif
2030 }
2031
2032 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
2033 return os::commit_memory(addr, size, !ExecMem);
2034 }
2035
2036 // If this is a growable mapping, remove the guard pages entirely by
2037 // munmap()ping them. If not, just call uncommit_memory().
2038 bool os::remove_stack_guard_pages(char* addr, size_t size) {
2039 return os::uncommit_memory(addr, size);
2040 }
2041
2042 // If 'fixed' is true, anon_mmap() will attempt to reserve anonymous memory
2043 // at 'requested_addr'. If there are existing memory mappings at the same
2044 // location, however, they will be overwritten. If 'fixed' is false,
2045 // 'requested_addr' is only treated as a hint, the return value may or
2046 // may not start from the requested address. Unlike Bsd mmap(), this
2047 // function returns NULL to indicate failure.
2048 static char* anon_mmap(char* requested_addr, size_t bytes, bool fixed) {
2049 char * addr;
2050 int flags;
2051
2052 flags = MAP_PRIVATE | MAP_NORESERVE | MAP_ANONYMOUS;
2053 if (fixed) {
2054 assert((uintptr_t)requested_addr % os::Bsd::page_size() == 0, "unaligned address");
2055 flags |= MAP_FIXED;
2056 }
2057
2058 // Map reserved/uncommitted pages PROT_NONE so we fail early if we
2059 // touch an uncommitted page. Otherwise, the read/write might
2060 // succeed if we have enough swap space to back the physical page.
2061 addr = (char*)::mmap(requested_addr, bytes, PROT_NONE,
2062 flags, -1, 0);
2063
2064 return addr == MAP_FAILED ? NULL : addr;
2065 }
2066
2067 static int anon_munmap(char * addr, size_t size) {
2068 return ::munmap(addr, size) == 0;
2069 }
2070
2071 char* os::pd_reserve_memory(size_t bytes, char* requested_addr,
2072 size_t alignment_hint) {
2073 return anon_mmap(requested_addr, bytes, (requested_addr != NULL));
2074 }
2075
2076 bool os::pd_release_memory(char* addr, size_t size) {
2077 return anon_munmap(addr, size);
2078 }
2079
2080 static bool bsd_mprotect(char* addr, size_t size, int prot) {
2081 // Bsd wants the mprotect address argument to be page aligned.
2082 char* bottom = (char*)align_down((intptr_t)addr, os::Bsd::page_size());
2083
2084 // According to SUSv3, mprotect() should only be used with mappings
2085 // established by mmap(), and mmap() always maps whole pages. Unaligned
2086 // 'addr' likely indicates problem in the VM (e.g. trying to change
2087 // protection of malloc'ed or statically allocated memory). Check the
2088 // caller if you hit this assert.
2089 assert(addr == bottom, "sanity check");
2090
2091 size = align_up(pointer_delta(addr, bottom, 1) + size, os::Bsd::page_size());
2092 Events::log(NULL, "Protecting memory [" INTPTR_FORMAT "," INTPTR_FORMAT "] with protection modes %x", p2i(bottom), p2i(bottom+size), prot);
2093 return ::mprotect(bottom, size, prot) == 0;
2094 }
2095
2096 // Set protections specified
2097 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
2098 bool is_committed) {
2099 unsigned int p = 0;
2100 switch (prot) {
2101 case MEM_PROT_NONE: p = PROT_NONE; break;
2102 case MEM_PROT_READ: p = PROT_READ; break;
2103 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break;
2104 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break;
2105 default:
2106 ShouldNotReachHere();
2107 }
2108 // is_committed is unused.
2109 return bsd_mprotect(addr, bytes, p);
2110 }
2111
2112 bool os::guard_memory(char* addr, size_t size) {
2113 return bsd_mprotect(addr, size, PROT_NONE);
2114 }
2115
2116 bool os::unguard_memory(char* addr, size_t size) {
2117 return bsd_mprotect(addr, size, PROT_READ|PROT_WRITE);
2118 }
2119
2120 bool os::Bsd::hugetlbfs_sanity_check(bool warn, size_t page_size) {
2121 return false;
2122 }
2123
2124 // Large page support
2125
2126 static size_t _large_page_size = 0;
2127
2128 void os::large_page_init() {
2129 }
2130
2131
2132 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* req_addr, bool exec) {
2133 fatal("os::reserve_memory_special should not be called on BSD.");
2134 return NULL;
2135 }
2136
2137 bool os::release_memory_special(char* base, size_t bytes) {
2138 fatal("os::release_memory_special should not be called on BSD.");
2139 return false;
2140 }
2141
2142 size_t os::large_page_size() {
2143 return _large_page_size;
2144 }
2145
2146 bool os::can_commit_large_page_memory() {
2147 // Does not matter, we do not support huge pages.
2148 return false;
2149 }
2150
2151 bool os::can_execute_large_page_memory() {
2152 // Does not matter, we do not support huge pages.
2153 return false;
2154 }
2155
2156 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr, int file_desc) {
2157 assert(file_desc >= 0, "file_desc is not valid");
2158 char* result = pd_attempt_reserve_memory_at(bytes, requested_addr);
2159 if (result != NULL) {
2160 if (replace_existing_mapping_with_file_mapping(result, bytes, file_desc) == NULL) {
2161 vm_exit_during_initialization(err_msg("Error in mapping Java heap at the given filesystem directory"));
2162 }
2163 }
2164 return result;
2165 }
2166
2167 // Reserve memory at an arbitrary address, only if that area is
2168 // available (and not reserved for something else).
2169
2170 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
2171 // Assert only that the size is a multiple of the page size, since
2172 // that's all that mmap requires, and since that's all we really know
2173 // about at this low abstraction level. If we need higher alignment,
2174 // we can either pass an alignment to this method or verify alignment
2175 // in one of the methods further up the call chain. See bug 5044738.
2176 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block");
2177
2178 // Repeatedly allocate blocks until the block is allocated at the
2179 // right spot.
2180
2181 // Bsd mmap allows caller to pass an address as hint; give it a try first,
2182 // if kernel honors the hint then we can return immediately.
2183 char * addr = anon_mmap(requested_addr, bytes, false);
2184 if (addr == requested_addr) {
2185 return requested_addr;
2186 }
2187
2188 if (addr != NULL) {
2189 // mmap() is successful but it fails to reserve at the requested address
2190 anon_munmap(addr, bytes);
2191 }
2192
2193 return NULL;
2194 }
2195
2196 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
2197 void os::infinite_sleep() {
2198 while (true) { // sleep forever ...
2199 ::sleep(100); // ... 100 seconds at a time
2200 }
2201 }
2202
2203 // Used to convert frequent JVM_Yield() to nops
2204 bool os::dont_yield() {
2205 return DontYieldALot;
2206 }
2207
2208 void os::naked_yield() {
2209 sched_yield();
2210 }
2211
2212 ////////////////////////////////////////////////////////////////////////////////
2213 // thread priority support
2214
2215 // Note: Normal Bsd applications are run with SCHED_OTHER policy. SCHED_OTHER
2216 // only supports dynamic priority, static priority must be zero. For real-time
2217 // applications, Bsd supports SCHED_RR which allows static priority (1-99).
2218 // However, for large multi-threaded applications, SCHED_RR is not only slower
2219 // than SCHED_OTHER, but also very unstable (my volano tests hang hard 4 out
2220 // of 5 runs - Sep 2005).
2221 //
2222 // The following code actually changes the niceness of kernel-thread/LWP. It
2223 // has an assumption that setpriority() only modifies one kernel-thread/LWP,
2224 // not the entire user process, and user level threads are 1:1 mapped to kernel
2225 // threads. It has always been the case, but could change in the future. For
2226 // this reason, the code should not be used as default (ThreadPriorityPolicy=0).
2227 // It is only used when ThreadPriorityPolicy=1 and may require system level permission
2228 // (e.g., root privilege or CAP_SYS_NICE capability).
2229
2230 #if !defined(__APPLE__)
2231 int os::java_to_os_priority[CriticalPriority + 1] = {
2232 19, // 0 Entry should never be used
2233
2234 0, // 1 MinPriority
2235 3, // 2
2236 6, // 3
2237
2238 10, // 4
2239 15, // 5 NormPriority
2240 18, // 6
2241
2242 21, // 7
2243 25, // 8
2244 28, // 9 NearMaxPriority
2245
2246 31, // 10 MaxPriority
2247
2248 31 // 11 CriticalPriority
2249 };
2250 #else
2251 // Using Mach high-level priority assignments
2252 int os::java_to_os_priority[CriticalPriority + 1] = {
2253 0, // 0 Entry should never be used (MINPRI_USER)
2254
2255 27, // 1 MinPriority
2256 28, // 2
2257 29, // 3
2258
2259 30, // 4
2260 31, // 5 NormPriority (BASEPRI_DEFAULT)
2261 32, // 6
2262
2263 33, // 7
2264 34, // 8
2265 35, // 9 NearMaxPriority
2266
2267 36, // 10 MaxPriority
2268
2269 36 // 11 CriticalPriority
2270 };
2271 #endif
2272
2273 static int prio_init() {
2274 if (ThreadPriorityPolicy == 1) {
2275 if (geteuid() != 0) {
2276 if (!FLAG_IS_DEFAULT(ThreadPriorityPolicy)) {
2277 warning("-XX:ThreadPriorityPolicy=1 may require system level permission, " \
2278 "e.g., being the root user. If the necessary permission is not " \
2279 "possessed, changes to priority will be silently ignored.");
2280 }
2281 }
2282 }
2283 if (UseCriticalJavaThreadPriority) {
2284 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority];
2285 }
2286 return 0;
2287 }
2288
2289 OSReturn os::set_native_priority(Thread* thread, int newpri) {
2290 if (!UseThreadPriorities || ThreadPriorityPolicy == 0) return OS_OK;
2291
2292 #ifdef __OpenBSD__
2293 // OpenBSD pthread_setprio starves low priority threads
2294 return OS_OK;
2295 #elif defined(__FreeBSD__)
2296 int ret = pthread_setprio(thread->osthread()->pthread_id(), newpri);
2297 return (ret == 0) ? OS_OK : OS_ERR;
2298 #elif defined(__APPLE__) || defined(__NetBSD__)
2299 struct sched_param sp;
2300 int policy;
2301
2302 if (pthread_getschedparam(thread->osthread()->pthread_id(), &policy, &sp) != 0) {
2303 return OS_ERR;
2304 }
2305
2306 sp.sched_priority = newpri;
2307 if (pthread_setschedparam(thread->osthread()->pthread_id(), policy, &sp) != 0) {
2308 return OS_ERR;
2309 }
2310
2311 return OS_OK;
2312 #else
2313 int ret = setpriority(PRIO_PROCESS, thread->osthread()->thread_id(), newpri);
2314 return (ret == 0) ? OS_OK : OS_ERR;
2315 #endif
2316 }
2317
2318 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) {
2319 if (!UseThreadPriorities || ThreadPriorityPolicy == 0) {
2320 *priority_ptr = java_to_os_priority[NormPriority];
2321 return OS_OK;
2322 }
2323
2324 errno = 0;
2325 #if defined(__OpenBSD__) || defined(__FreeBSD__)
2326 *priority_ptr = pthread_getprio(thread->osthread()->pthread_id());
2327 #elif defined(__APPLE__) || defined(__NetBSD__)
2328 int policy;
2329 struct sched_param sp;
2330
2331 int res = pthread_getschedparam(thread->osthread()->pthread_id(), &policy, &sp);
2332 if (res != 0) {
2333 *priority_ptr = -1;
2334 return OS_ERR;
2335 } else {
2336 *priority_ptr = sp.sched_priority;
2337 return OS_OK;
2338 }
2339 #else
2340 *priority_ptr = getpriority(PRIO_PROCESS, thread->osthread()->thread_id());
2341 #endif
2342 return (*priority_ptr != -1 || errno == 0 ? OS_OK : OS_ERR);
2343 }
2344
2345 ////////////////////////////////////////////////////////////////////////////////
2346 // suspend/resume support
2347
2348 // The low-level signal-based suspend/resume support is a remnant from the
2349 // old VM-suspension that used to be for java-suspension, safepoints etc,
2350 // within hotspot. Currently used by JFR's OSThreadSampler
2351 //
2352 // The remaining code is greatly simplified from the more general suspension
2353 // code that used to be used.
2354 //
2355 // The protocol is quite simple:
2356 // - suspend:
2357 // - sends a signal to the target thread
2358 // - polls the suspend state of the osthread using a yield loop
2359 // - target thread signal handler (SR_handler) sets suspend state
2360 // and blocks in sigsuspend until continued
2361 // - resume:
2362 // - sets target osthread state to continue
2363 // - sends signal to end the sigsuspend loop in the SR_handler
2364 //
2365 // Note that the SR_lock plays no role in this suspend/resume protocol,
2366 // but is checked for NULL in SR_handler as a thread termination indicator.
2367 // The SR_lock is, however, used by JavaThread::java_suspend()/java_resume() APIs.
2368 //
2369 // Note that resume_clear_context() and suspend_save_context() are needed
2370 // by SR_handler(), so that fetch_frame_from_ucontext() works,
2371 // which in part is used by:
2372 // - Forte Analyzer: AsyncGetCallTrace()
2373 // - StackBanging: get_frame_at_stack_banging_point()
2374
2375 static void resume_clear_context(OSThread *osthread) {
2376 osthread->set_ucontext(NULL);
2377 osthread->set_siginfo(NULL);
2378 }
2379
2380 static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) {
2381 osthread->set_ucontext(context);
2382 osthread->set_siginfo(siginfo);
2383 }
2384
2385 // Handler function invoked when a thread's execution is suspended or
2386 // resumed. We have to be careful that only async-safe functions are
2387 // called here (Note: most pthread functions are not async safe and
2388 // should be avoided.)
2389 //
2390 // Note: sigwait() is a more natural fit than sigsuspend() from an
2391 // interface point of view, but sigwait() prevents the signal hander
2392 // from being run. libpthread would get very confused by not having
2393 // its signal handlers run and prevents sigwait()'s use with the
2394 // mutex granting granting signal.
2395 //
2396 // Currently only ever called on the VMThread or JavaThread
2397 //
2398 #ifdef __APPLE__
2399 static OSXSemaphore sr_semaphore;
2400 #else
2401 static PosixSemaphore sr_semaphore;
2402 #endif
2403
2404 static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) {
2405 // Save and restore errno to avoid confusing native code with EINTR
2406 // after sigsuspend.
2407 int old_errno = errno;
2408
2409 Thread* thread = Thread::current_or_null_safe();
2410 assert(thread != NULL, "Missing current thread in SR_handler");
2411
2412 // On some systems we have seen signal delivery get "stuck" until the signal
2413 // mask is changed as part of thread termination. Check that the current thread
2414 // has not already terminated (via SR_lock()) - else the following assertion
2415 // will fail because the thread is no longer a JavaThread as the ~JavaThread
2416 // destructor has completed.
2417
2418 if (thread->SR_lock() == NULL) {
2419 return;
2420 }
2421
2422 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread");
2423
2424 OSThread* osthread = thread->osthread();
2425
2426 os::SuspendResume::State current = osthread->sr.state();
2427 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) {
2428 suspend_save_context(osthread, siginfo, context);
2429
2430 // attempt to switch the state, we assume we had a SUSPEND_REQUEST
2431 os::SuspendResume::State state = osthread->sr.suspended();
2432 if (state == os::SuspendResume::SR_SUSPENDED) {
2433 sigset_t suspend_set; // signals for sigsuspend()
2434
2435 // get current set of blocked signals and unblock resume signal
2436 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set);
2437 sigdelset(&suspend_set, SR_signum);
2438
2439 sr_semaphore.signal();
2440 // wait here until we are resumed
2441 while (1) {
2442 sigsuspend(&suspend_set);
2443
2444 os::SuspendResume::State result = osthread->sr.running();
2445 if (result == os::SuspendResume::SR_RUNNING) {
2446 sr_semaphore.signal();
2447 break;
2448 } else if (result != os::SuspendResume::SR_SUSPENDED) {
2449 ShouldNotReachHere();
2450 }
2451 }
2452
2453 } else if (state == os::SuspendResume::SR_RUNNING) {
2454 // request was cancelled, continue
2455 } else {
2456 ShouldNotReachHere();
2457 }
2458
2459 resume_clear_context(osthread);
2460 } else if (current == os::SuspendResume::SR_RUNNING) {
2461 // request was cancelled, continue
2462 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) {
2463 // ignore
2464 } else {
2465 // ignore
2466 }
2467
2468 errno = old_errno;
2469 }
2470
2471
2472 static int SR_initialize() {
2473 struct sigaction act;
2474 char *s;
2475 // Get signal number to use for suspend/resume
2476 if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) {
2477 int sig = ::strtol(s, 0, 10);
2478 if (sig > MAX2(SIGSEGV, SIGBUS) && // See 4355769.
2479 sig < NSIG) { // Must be legal signal and fit into sigflags[].
2480 SR_signum = sig;
2481 } else {
2482 warning("You set _JAVA_SR_SIGNUM=%d. It must be in range [%d, %d]. Using %d instead.",
2483 sig, MAX2(SIGSEGV, SIGBUS)+1, NSIG-1, SR_signum);
2484 }
2485 }
2486
2487 assert(SR_signum > SIGSEGV && SR_signum > SIGBUS,
2488 "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769");
2489
2490 sigemptyset(&SR_sigset);
2491 sigaddset(&SR_sigset, SR_signum);
2492
2493 // Set up signal handler for suspend/resume
2494 act.sa_flags = SA_RESTART|SA_SIGINFO;
2495 act.sa_handler = (void (*)(int)) SR_handler;
2496
2497 // SR_signum is blocked by default.
2498 // 4528190 - We also need to block pthread restart signal (32 on all
2499 // supported Bsd platforms). Note that BsdThreads need to block
2500 // this signal for all threads to work properly. So we don't have
2501 // to use hard-coded signal number when setting up the mask.
2502 pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask);
2503
2504 if (sigaction(SR_signum, &act, 0) == -1) {
2505 return -1;
2506 }
2507
2508 // Save signal flag
2509 os::Bsd::set_our_sigflags(SR_signum, act.sa_flags);
2510 return 0;
2511 }
2512
2513 static int sr_notify(OSThread* osthread) {
2514 int status = pthread_kill(osthread->pthread_id(), SR_signum);
2515 assert_status(status == 0, status, "pthread_kill");
2516 return status;
2517 }
2518
2519 // "Randomly" selected value for how long we want to spin
2520 // before bailing out on suspending a thread, also how often
2521 // we send a signal to a thread we want to resume
2522 static const int RANDOMLY_LARGE_INTEGER = 1000000;
2523 static const int RANDOMLY_LARGE_INTEGER2 = 100;
2524
2525 // returns true on success and false on error - really an error is fatal
2526 // but this seems the normal response to library errors
2527 static bool do_suspend(OSThread* osthread) {
2528 assert(osthread->sr.is_running(), "thread should be running");
2529 assert(!sr_semaphore.trywait(), "semaphore has invalid state");
2530
2531 // mark as suspended and send signal
2532 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) {
2533 // failed to switch, state wasn't running?
2534 ShouldNotReachHere();
2535 return false;
2536 }
2537
2538 if (sr_notify(osthread) != 0) {
2539 ShouldNotReachHere();
2540 }
2541
2542 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED
2543 while (true) {
2544 if (sr_semaphore.timedwait(2)) {
2545 break;
2546 } else {
2547 // timeout
2548 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend();
2549 if (cancelled == os::SuspendResume::SR_RUNNING) {
2550 return false;
2551 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) {
2552 // make sure that we consume the signal on the semaphore as well
2553 sr_semaphore.wait();
2554 break;
2555 } else {
2556 ShouldNotReachHere();
2557 return false;
2558 }
2559 }
2560 }
2561
2562 guarantee(osthread->sr.is_suspended(), "Must be suspended");
2563 return true;
2564 }
2565
2566 static void do_resume(OSThread* osthread) {
2567 assert(osthread->sr.is_suspended(), "thread should be suspended");
2568 assert(!sr_semaphore.trywait(), "invalid semaphore state");
2569
2570 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) {
2571 // failed to switch to WAKEUP_REQUEST
2572 ShouldNotReachHere();
2573 return;
2574 }
2575
2576 while (true) {
2577 if (sr_notify(osthread) == 0) {
2578 if (sr_semaphore.timedwait(2)) {
2579 if (osthread->sr.is_running()) {
2580 return;
2581 }
2582 }
2583 } else {
2584 ShouldNotReachHere();
2585 }
2586 }
2587
2588 guarantee(osthread->sr.is_running(), "Must be running!");
2589 }
2590
2591 ///////////////////////////////////////////////////////////////////////////////////
2592 // signal handling (except suspend/resume)
2593
2594 // This routine may be used by user applications as a "hook" to catch signals.
2595 // The user-defined signal handler must pass unrecognized signals to this
2596 // routine, and if it returns true (non-zero), then the signal handler must
2597 // return immediately. If the flag "abort_if_unrecognized" is true, then this
2598 // routine will never retun false (zero), but instead will execute a VM panic
2599 // routine kill the process.
2600 //
2601 // If this routine returns false, it is OK to call it again. This allows
2602 // the user-defined signal handler to perform checks either before or after
2603 // the VM performs its own checks. Naturally, the user code would be making
2604 // a serious error if it tried to handle an exception (such as a null check
2605 // or breakpoint) that the VM was generating for its own correct operation.
2606 //
2607 // This routine may recognize any of the following kinds of signals:
2608 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1.
2609 // It should be consulted by handlers for any of those signals.
2610 //
2611 // The caller of this routine must pass in the three arguments supplied
2612 // to the function referred to in the "sa_sigaction" (not the "sa_handler")
2613 // field of the structure passed to sigaction(). This routine assumes that
2614 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART.
2615 //
2616 // Note that the VM will print warnings if it detects conflicting signal
2617 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers".
2618 //
2619 extern "C" JNIEXPORT int JVM_handle_bsd_signal(int signo, siginfo_t* siginfo,
2620 void* ucontext,
2621 int abort_if_unrecognized);
2622
2623 static void signalHandler(int sig, siginfo_t* info, void* uc) {
2624 assert(info != NULL && uc != NULL, "it must be old kernel");
2625 int orig_errno = errno; // Preserve errno value over signal handler.
2626 JVM_handle_bsd_signal(sig, info, uc, true);
2627 errno = orig_errno;
2628 }
2629
2630
2631 // This boolean allows users to forward their own non-matching signals
2632 // to JVM_handle_bsd_signal, harmlessly.
2633 bool os::Bsd::signal_handlers_are_installed = false;
2634
2635 // For signal-chaining
2636 bool os::Bsd::libjsig_is_loaded = false;
2637 typedef struct sigaction *(*get_signal_t)(int);
2638 get_signal_t os::Bsd::get_signal_action = NULL;
2639
2640 struct sigaction* os::Bsd::get_chained_signal_action(int sig) {
2641 struct sigaction *actp = NULL;
2642
2643 if (libjsig_is_loaded) {
2644 // Retrieve the old signal handler from libjsig
2645 actp = (*get_signal_action)(sig);
2646 }
2647 if (actp == NULL) {
2648 // Retrieve the preinstalled signal handler from jvm
2649 actp = os::Posix::get_preinstalled_handler(sig);
2650 }
2651
2652 return actp;
2653 }
2654
2655 static bool call_chained_handler(struct sigaction *actp, int sig,
2656 siginfo_t *siginfo, void *context) {
2657 // Call the old signal handler
2658 if (actp->sa_handler == SIG_DFL) {
2659 // It's more reasonable to let jvm treat it as an unexpected exception
2660 // instead of taking the default action.
2661 return false;
2662 } else if (actp->sa_handler != SIG_IGN) {
2663 if ((actp->sa_flags & SA_NODEFER) == 0) {
2664 // automaticlly block the signal
2665 sigaddset(&(actp->sa_mask), sig);
2666 }
2667
2668 sa_handler_t hand;
2669 sa_sigaction_t sa;
2670 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0;
2671 // retrieve the chained handler
2672 if (siginfo_flag_set) {
2673 sa = actp->sa_sigaction;
2674 } else {
2675 hand = actp->sa_handler;
2676 }
2677
2678 if ((actp->sa_flags & SA_RESETHAND) != 0) {
2679 actp->sa_handler = SIG_DFL;
2680 }
2681
2682 // try to honor the signal mask
2683 sigset_t oset;
2684 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset);
2685
2686 // call into the chained handler
2687 if (siginfo_flag_set) {
2688 (*sa)(sig, siginfo, context);
2689 } else {
2690 (*hand)(sig);
2691 }
2692
2693 // restore the signal mask
2694 pthread_sigmask(SIG_SETMASK, &oset, 0);
2695 }
2696 // Tell jvm's signal handler the signal is taken care of.
2697 return true;
2698 }
2699
2700 bool os::Bsd::chained_handler(int sig, siginfo_t* siginfo, void* context) {
2701 bool chained = false;
2702 // signal-chaining
2703 if (UseSignalChaining) {
2704 struct sigaction *actp = get_chained_signal_action(sig);
2705 if (actp != NULL) {
2706 chained = call_chained_handler(actp, sig, siginfo, context);
2707 }
2708 }
2709 return chained;
2710 }
2711
2712 // for diagnostic
2713 int sigflags[NSIG];
2714
2715 int os::Bsd::get_our_sigflags(int sig) {
2716 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
2717 return sigflags[sig];
2718 }
2719
2720 void os::Bsd::set_our_sigflags(int sig, int flags) {
2721 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
2722 if (sig > 0 && sig < NSIG) {
2723 sigflags[sig] = flags;
2724 }
2725 }
2726
2727 void os::Bsd::set_signal_handler(int sig, bool set_installed) {
2728 // Check for overwrite.
2729 struct sigaction oldAct;
2730 sigaction(sig, (struct sigaction*)NULL, &oldAct);
2731
2732 void* oldhand = oldAct.sa_sigaction
2733 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
2734 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
2735 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) &&
2736 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) &&
2737 oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)signalHandler)) {
2738 if (AllowUserSignalHandlers || !set_installed) {
2739 // Do not overwrite; user takes responsibility to forward to us.
2740 return;
2741 } else if (UseSignalChaining) {
2742 // save the old handler in jvm
2743 os::Posix::save_preinstalled_handler(sig, oldAct);
2744 // libjsig also interposes the sigaction() call below and saves the
2745 // old sigaction on it own.
2746 } else {
2747 fatal("Encountered unexpected pre-existing sigaction handler "
2748 "%#lx for signal %d.", (long)oldhand, sig);
2749 }
2750 }
2751
2752 struct sigaction sigAct;
2753 sigfillset(&(sigAct.sa_mask));
2754 sigAct.sa_handler = SIG_DFL;
2755 if (!set_installed) {
2756 sigAct.sa_flags = SA_SIGINFO|SA_RESTART;
2757 } else {
2758 sigAct.sa_sigaction = signalHandler;
2759 sigAct.sa_flags = SA_SIGINFO|SA_RESTART;
2760 }
2761 #ifdef __APPLE__
2762 // Needed for main thread as XNU (Mac OS X kernel) will only deliver SIGSEGV
2763 // (which starts as SIGBUS) on main thread with faulting address inside "stack+guard pages"
2764 // if the signal handler declares it will handle it on alternate stack.
2765 // Notice we only declare we will handle it on alt stack, but we are not
2766 // actually going to use real alt stack - this is just a workaround.
2767 // Please see ux_exception.c, method catch_mach_exception_raise for details
2768 // link http://www.opensource.apple.com/source/xnu/xnu-2050.18.24/bsd/uxkern/ux_exception.c
2769 if (sig == SIGSEGV) {
2770 sigAct.sa_flags |= SA_ONSTACK;
2771 }
2772 #endif
2773
2774 // Save flags, which are set by ours
2775 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
2776 sigflags[sig] = sigAct.sa_flags;
2777
2778 int ret = sigaction(sig, &sigAct, &oldAct);
2779 assert(ret == 0, "check");
2780
2781 void* oldhand2 = oldAct.sa_sigaction
2782 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
2783 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
2784 assert(oldhand2 == oldhand, "no concurrent signal handler installation");
2785 }
2786
2787 // install signal handlers for signals that HotSpot needs to
2788 // handle in order to support Java-level exception handling.
2789
2790 void os::Bsd::install_signal_handlers() {
2791 if (!signal_handlers_are_installed) {
2792 signal_handlers_are_installed = true;
2793
2794 // signal-chaining
2795 typedef void (*signal_setting_t)();
2796 signal_setting_t begin_signal_setting = NULL;
2797 signal_setting_t end_signal_setting = NULL;
2798 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
2799 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting"));
2800 if (begin_signal_setting != NULL) {
2801 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
2802 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting"));
2803 get_signal_action = CAST_TO_FN_PTR(get_signal_t,
2804 dlsym(RTLD_DEFAULT, "JVM_get_signal_action"));
2805 libjsig_is_loaded = true;
2806 assert(UseSignalChaining, "should enable signal-chaining");
2807 }
2808 if (libjsig_is_loaded) {
2809 // Tell libjsig jvm is setting signal handlers
2810 (*begin_signal_setting)();
2811 }
2812
2813 set_signal_handler(SIGSEGV, true);
2814 set_signal_handler(SIGPIPE, true);
2815 set_signal_handler(SIGBUS, true);
2816 set_signal_handler(SIGILL, true);
2817 set_signal_handler(SIGFPE, true);
2818 set_signal_handler(SIGXFSZ, true);
2819
2820 #if defined(__APPLE__)
2821 // In Mac OS X 10.4, CrashReporter will write a crash log for all 'fatal' signals, including
2822 // signals caught and handled by the JVM. To work around this, we reset the mach task
2823 // signal handler that's placed on our process by CrashReporter. This disables
2824 // CrashReporter-based reporting.
2825 //
2826 // This work-around is not necessary for 10.5+, as CrashReporter no longer intercedes
2827 // on caught fatal signals.
2828 //
2829 // Additionally, gdb installs both standard BSD signal handlers, and mach exception
2830 // handlers. By replacing the existing task exception handler, we disable gdb's mach
2831 // exception handling, while leaving the standard BSD signal handlers functional.
2832 kern_return_t kr;
2833 kr = task_set_exception_ports(mach_task_self(),
2834 EXC_MASK_BAD_ACCESS | EXC_MASK_ARITHMETIC,
2835 MACH_PORT_NULL,
2836 EXCEPTION_STATE_IDENTITY,
2837 MACHINE_THREAD_STATE);
2838
2839 assert(kr == KERN_SUCCESS, "could not set mach task signal handler");
2840 #endif
2841
2842 if (libjsig_is_loaded) {
2843 // Tell libjsig jvm finishes setting signal handlers
2844 (*end_signal_setting)();
2845 }
2846
2847 // We don't activate signal checker if libjsig is in place, we trust ourselves
2848 // and if UserSignalHandler is installed all bets are off
2849 if (CheckJNICalls) {
2850 if (libjsig_is_loaded) {
2851 log_debug(jni, resolve)("Info: libjsig is activated, all active signal checking is disabled");
2852 check_signals = false;
2853 }
2854 if (AllowUserSignalHandlers) {
2855 log_debug(jni, resolve)("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled");
2856 check_signals = false;
2857 }
2858 }
2859 }
2860 }
2861
2862
2863 /////
2864 // glibc on Bsd platform uses non-documented flag
2865 // to indicate, that some special sort of signal
2866 // trampoline is used.
2867 // We will never set this flag, and we should
2868 // ignore this flag in our diagnostic
2869 #ifdef SIGNIFICANT_SIGNAL_MASK
2870 #undef SIGNIFICANT_SIGNAL_MASK
2871 #endif
2872 #define SIGNIFICANT_SIGNAL_MASK (~0x04000000)
2873
2874 static const char* get_signal_handler_name(address handler,
2875 char* buf, int buflen) {
2876 int offset;
2877 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset);
2878 if (found) {
2879 // skip directory names
2880 const char *p1, *p2;
2881 p1 = buf;
2882 size_t len = strlen(os::file_separator());
2883 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len;
2884 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset);
2885 } else {
2886 jio_snprintf(buf, buflen, PTR_FORMAT, handler);
2887 }
2888 return buf;
2889 }
2890
2891 static void print_signal_handler(outputStream* st, int sig,
2892 char* buf, size_t buflen) {
2893 struct sigaction sa;
2894
2895 sigaction(sig, NULL, &sa);
2896
2897 // See comment for SIGNIFICANT_SIGNAL_MASK define
2898 sa.sa_flags &= SIGNIFICANT_SIGNAL_MASK;
2899
2900 st->print("%s: ", os::exception_name(sig, buf, buflen));
2901
2902 address handler = (sa.sa_flags & SA_SIGINFO)
2903 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction)
2904 : CAST_FROM_FN_PTR(address, sa.sa_handler);
2905
2906 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) {
2907 st->print("SIG_DFL");
2908 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) {
2909 st->print("SIG_IGN");
2910 } else {
2911 st->print("[%s]", get_signal_handler_name(handler, buf, buflen));
2912 }
2913
2914 st->print(", sa_mask[0]=");
2915 os::Posix::print_signal_set_short(st, &sa.sa_mask);
2916
2917 address rh = VMError::get_resetted_sighandler(sig);
2918 // May be, handler was resetted by VMError?
2919 if (rh != NULL) {
2920 handler = rh;
2921 sa.sa_flags = VMError::get_resetted_sigflags(sig) & SIGNIFICANT_SIGNAL_MASK;
2922 }
2923
2924 st->print(", sa_flags=");
2925 os::Posix::print_sa_flags(st, sa.sa_flags);
2926
2927 // Check: is it our handler?
2928 if (handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler) ||
2929 handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) {
2930 // It is our signal handler
2931 // check for flags, reset system-used one!
2932 if ((int)sa.sa_flags != os::Bsd::get_our_sigflags(sig)) {
2933 st->print(
2934 ", flags was changed from " PTR32_FORMAT ", consider using jsig library",
2935 os::Bsd::get_our_sigflags(sig));
2936 }
2937 }
2938 st->cr();
2939 }
2940
2941
2942 #define DO_SIGNAL_CHECK(sig) \
2943 do { \
2944 if (!sigismember(&check_signal_done, sig)) { \
2945 os::Bsd::check_signal_handler(sig); \
2946 } \
2947 } while (0)
2948
2949 // This method is a periodic task to check for misbehaving JNI applications
2950 // under CheckJNI, we can add any periodic checks here
2951
2952 void os::run_periodic_checks() {
2953
2954 if (check_signals == false) return;
2955
2956 // SEGV and BUS if overridden could potentially prevent
2957 // generation of hs*.log in the event of a crash, debugging
2958 // such a case can be very challenging, so we absolutely
2959 // check the following for a good measure:
2960 DO_SIGNAL_CHECK(SIGSEGV);
2961 DO_SIGNAL_CHECK(SIGILL);
2962 DO_SIGNAL_CHECK(SIGFPE);
2963 DO_SIGNAL_CHECK(SIGBUS);
2964 DO_SIGNAL_CHECK(SIGPIPE);
2965 DO_SIGNAL_CHECK(SIGXFSZ);
2966
2967
2968 // ReduceSignalUsage allows the user to override these handlers
2969 // see comments at the very top and jvm_md.h
2970 if (!ReduceSignalUsage) {
2971 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL);
2972 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL);
2973 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL);
2974 DO_SIGNAL_CHECK(BREAK_SIGNAL);
2975 }
2976
2977 DO_SIGNAL_CHECK(SR_signum);
2978 }
2979
2980 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *);
2981
2982 static os_sigaction_t os_sigaction = NULL;
2983
2984 void os::Bsd::check_signal_handler(int sig) {
2985 char buf[O_BUFLEN];
2986 address jvmHandler = NULL;
2987
2988
2989 struct sigaction act;
2990 if (os_sigaction == NULL) {
2991 // only trust the default sigaction, in case it has been interposed
2992 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction");
2993 if (os_sigaction == NULL) return;
2994 }
2995
2996 os_sigaction(sig, (struct sigaction*)NULL, &act);
2997
2998
2999 act.sa_flags &= SIGNIFICANT_SIGNAL_MASK;
3000
3001 address thisHandler = (act.sa_flags & SA_SIGINFO)
3002 ? CAST_FROM_FN_PTR(address, act.sa_sigaction)
3003 : CAST_FROM_FN_PTR(address, act.sa_handler);
3004
3005
3006 switch (sig) {
3007 case SIGSEGV:
3008 case SIGBUS:
3009 case SIGFPE:
3010 case SIGPIPE:
3011 case SIGILL:
3012 case SIGXFSZ:
3013 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler);
3014 break;
3015
3016 case SHUTDOWN1_SIGNAL:
3017 case SHUTDOWN2_SIGNAL:
3018 case SHUTDOWN3_SIGNAL:
3019 case BREAK_SIGNAL:
3020 jvmHandler = (address)user_handler();
3021 break;
3022
3023 default:
3024 if (sig == SR_signum) {
3025 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler);
3026 } else {
3027 return;
3028 }
3029 break;
3030 }
3031
3032 if (thisHandler != jvmHandler) {
3033 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN));
3034 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN));
3035 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN));
3036 // No need to check this sig any longer
3037 sigaddset(&check_signal_done, sig);
3038 // Running under non-interactive shell, SHUTDOWN2_SIGNAL will be reassigned SIG_IGN
3039 if (sig == SHUTDOWN2_SIGNAL && !isatty(fileno(stdin))) {
3040 tty->print_cr("Running in non-interactive shell, %s handler is replaced by shell",
3041 exception_name(sig, buf, O_BUFLEN));
3042 }
3043 } else if(os::Bsd::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Bsd::get_our_sigflags(sig)) {
3044 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN));
3045 tty->print("expected:");
3046 os::Posix::print_sa_flags(tty, os::Bsd::get_our_sigflags(sig));
3047 tty->cr();
3048 tty->print(" found:");
3049 os::Posix::print_sa_flags(tty, act.sa_flags);
3050 tty->cr();
3051 // No need to check this sig any longer
3052 sigaddset(&check_signal_done, sig);
3053 }
3054
3055 // Dump all the signal
3056 if (sigismember(&check_signal_done, sig)) {
3057 print_signal_handlers(tty, buf, O_BUFLEN);
3058 }
3059 }
3060
3061 extern void report_error(char* file_name, int line_no, char* title,
3062 char* format, ...);
3063
3064 // this is called _before_ the most of global arguments have been parsed
3065 void os::init(void) {
3066 char dummy; // used to get a guess on initial stack address
3067
3068 clock_tics_per_sec = CLK_TCK;
3069
3070 init_random(1234567);
3071
3072 Bsd::set_page_size(getpagesize());
3073 if (Bsd::page_size() == -1) {
3074 fatal("os_bsd.cpp: os::init: sysconf failed (%s)", os::strerror(errno));
3075 }
3076 init_page_sizes((size_t) Bsd::page_size());
3077
3078 Bsd::initialize_system_info();
3079
3080 // _main_thread points to the thread that created/loaded the JVM.
3081 Bsd::_main_thread = pthread_self();
3082
3083 Bsd::clock_init();
3084 initial_time_count = javaTimeNanos();
3085
3086 os::Posix::init();
3087 }
3088
3089 // To install functions for atexit system call
3090 extern "C" {
3091 static void perfMemory_exit_helper() {
3092 perfMemory_exit();
3093 }
3094 }
3095
3096 // this is called _after_ the global arguments have been parsed
3097 jint os::init_2(void) {
3098
3099 // This could be set after os::Posix::init() but all platforms
3100 // have to set it the same so we have to mirror Solaris.
3101 DEBUG_ONLY(os::set_mutex_init_done();)
3102
3103 os::Posix::init_2();
3104
3105 // initialize suspend/resume support - must do this before signal_sets_init()
3106 if (SR_initialize() != 0) {
3107 perror("SR_initialize failed");
3108 return JNI_ERR;
3109 }
3110
3111 Bsd::signal_sets_init();
3112 Bsd::install_signal_handlers();
3113 // Initialize data for jdk.internal.misc.Signal
3114 if (!ReduceSignalUsage) {
3115 jdk_misc_signal_init();
3116 }
3117
3118 // Check and sets minimum stack sizes against command line options
3119 if (Posix::set_minimum_stack_sizes() == JNI_ERR) {
3120 return JNI_ERR;
3121 }
3122
3123 if (MaxFDLimit) {
3124 // set the number of file descriptors to max. print out error
3125 // if getrlimit/setrlimit fails but continue regardless.
3126 struct rlimit nbr_files;
3127 int status = getrlimit(RLIMIT_NOFILE, &nbr_files);
3128 if (status != 0) {
3129 log_info(os)("os::init_2 getrlimit failed: %s", os::strerror(errno));
3130 } else {
3131 nbr_files.rlim_cur = nbr_files.rlim_max;
3132
3133 #ifdef __APPLE__
3134 // Darwin returns RLIM_INFINITY for rlim_max, but fails with EINVAL if
3135 // you attempt to use RLIM_INFINITY. As per setrlimit(2), OPEN_MAX must
3136 // be used instead
3137 nbr_files.rlim_cur = MIN(OPEN_MAX, nbr_files.rlim_cur);
3138 #endif
3139
3140 status = setrlimit(RLIMIT_NOFILE, &nbr_files);
3141 if (status != 0) {
3142 log_info(os)("os::init_2 setrlimit failed: %s", os::strerror(errno));
3143 }
3144 }
3145 }
3146
3147 // at-exit methods are called in the reverse order of their registration.
3148 // atexit functions are called on return from main or as a result of a
3149 // call to exit(3C). There can be only 32 of these functions registered
3150 // and atexit() does not set errno.
3151
3152 if (PerfAllowAtExitRegistration) {
3153 // only register atexit functions if PerfAllowAtExitRegistration is set.
3154 // atexit functions can be delayed until process exit time, which
3155 // can be problematic for embedded VM situations. Embedded VMs should
3156 // call DestroyJavaVM() to assure that VM resources are released.
3157
3158 // note: perfMemory_exit_helper atexit function may be removed in
3159 // the future if the appropriate cleanup code can be added to the
3160 // VM_Exit VMOperation's doit method.
3161 if (atexit(perfMemory_exit_helper) != 0) {
3162 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
3163 }
3164 }
3165
3166 // initialize thread priority policy
3167 prio_init();
3168
3169 #ifdef __APPLE__
3170 // dynamically link to objective c gc registration
3171 void *handleLibObjc = dlopen(OBJC_LIB, RTLD_LAZY);
3172 if (handleLibObjc != NULL) {
3173 objc_registerThreadWithCollectorFunction = (objc_registerThreadWithCollector_t) dlsym(handleLibObjc, OBJC_GCREGISTER);
3174 }
3175 #endif
3176
3177 return JNI_OK;
3178 }
3179
3180 // Mark the polling page as unreadable
3181 void os::make_polling_page_unreadable(void) {
3182 if (!guard_memory((char*)_polling_page, Bsd::page_size())) {
3183 fatal("Could not disable polling page");
3184 }
3185 }
3186
3187 // Mark the polling page as readable
3188 void os::make_polling_page_readable(void) {
3189 if (!bsd_mprotect((char *)_polling_page, Bsd::page_size(), PROT_READ)) {
3190 fatal("Could not enable polling page");
3191 }
3192 }
3193
3194 int os::active_processor_count() {
3195 // User has overridden the number of active processors
3196 if (ActiveProcessorCount > 0) {
3197 log_trace(os)("active_processor_count: "
3198 "active processor count set by user : %d",
3199 ActiveProcessorCount);
3200 return ActiveProcessorCount;
3201 }
3202
3203 return _processor_count;
3204 }
3205
3206 #ifdef __APPLE__
3207 static volatile int* volatile apic_to_processor_mapping = NULL;
3208 static volatile int next_processor_id = 0;
3209
3210 static inline volatile int* get_apic_to_processor_mapping() {
3211 volatile int* mapping = Atomic::load_acquire(&apic_to_processor_mapping);
3212 if (mapping == NULL) {
3213 // Calculate possible number space for APIC ids. This space is not necessarily
3214 // in the range [0, number_of_processors).
3215 uint total_bits = 0;
3216 for (uint i = 0;; ++i) {
3217 uint eax = 0xb; // Query topology leaf
3218 uint ebx;
3219 uint ecx = i;
3220 uint edx;
3221
3222 __asm__ ("cpuid\n\t" : "+a" (eax), "+b" (ebx), "+c" (ecx), "+d" (edx) : );
3223
3224 uint level_type = (ecx >> 8) & 0xFF;
3225 if (level_type == 0) {
3226 // Invalid level; end of topology
3227 break;
3228 }
3229 uint level_apic_id_shift = eax & ((1u << 5) - 1);
3230 total_bits += level_apic_id_shift;
3231 }
3232
3233 uint max_apic_ids = 1u << total_bits;
3234 mapping = NEW_C_HEAP_ARRAY(int, max_apic_ids, mtInternal);
3235
3236 for (uint i = 0; i < max_apic_ids; ++i) {
3237 mapping[i] = -1;
3238 }
3239
3240 if (!Atomic::replace_if_null(mapping, &apic_to_processor_mapping)) {
3241 FREE_C_HEAP_ARRAY(int, mapping);
3242 mapping = Atomic::load_acquire(&apic_to_processor_mapping);
3243 }
3244 }
3245
3246 return mapping;
3247 }
3248
3249 uint os::processor_id() {
3250 volatile int* mapping = get_apic_to_processor_mapping();
3251
3252 uint eax = 0xb;
3253 uint ebx;
3254 uint ecx = 0;
3255 uint edx;
3256
3257 __asm__ ("cpuid\n\t" : "+a" (eax), "+b" (ebx), "+c" (ecx), "+d" (edx) : );
3258
3259 // Map from APIC id to a unique logical processor ID in the expected
3260 // [0, num_processors) range.
3261
3262 uint apic_id = edx;
3263 int processor_id = Atomic::load(&mapping[apic_id]);
3264
3265 while (processor_id < 0) {
3266 if (Atomic::cmpxchg(-2, &mapping[apic_id], -1)) {
3267 Atomic::store(Atomic::add(1, &next_processor_id) - 1, &mapping[apic_id]);
3268 }
3269 processor_id = Atomic::load(&mapping[apic_id]);
3270 }
3271
3272 return (uint)processor_id;
3273 }
3274 #endif
3275
3276 void os::set_native_thread_name(const char *name) {
3277 #if defined(__APPLE__) && MAC_OS_X_VERSION_MIN_REQUIRED > MAC_OS_X_VERSION_10_5
3278 // This is only supported in Snow Leopard and beyond
3279 if (name != NULL) {
3280 // Add a "Java: " prefix to the name
3281 char buf[MAXTHREADNAMESIZE];
3282 snprintf(buf, sizeof(buf), "Java: %s", name);
3283 pthread_setname_np(buf);
3284 }
3285 #endif
3286 }
3287
3288 bool os::bind_to_processor(uint processor_id) {
3289 // Not yet implemented.
3290 return false;
3291 }
3292
3293 void os::SuspendedThreadTask::internal_do_task() {
3294 if (do_suspend(_thread->osthread())) {
3295 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext());
3296 do_task(context);
3297 do_resume(_thread->osthread());
3298 }
3299 }
3300
3301 ////////////////////////////////////////////////////////////////////////////////
3302 // debug support
3303
3304 bool os::find(address addr, outputStream* st) {
3305 Dl_info dlinfo;
3306 memset(&dlinfo, 0, sizeof(dlinfo));
3307 if (dladdr(addr, &dlinfo) != 0) {
3308 st->print(INTPTR_FORMAT ": ", (intptr_t)addr);
3309 if (dlinfo.dli_sname != NULL && dlinfo.dli_saddr != NULL) {
3310 st->print("%s+%#x", dlinfo.dli_sname,
3311 (uint)((uintptr_t)addr - (uintptr_t)dlinfo.dli_saddr));
3312 } else if (dlinfo.dli_fbase != NULL) {
3313 st->print("<offset %#x>", (uint)((uintptr_t)addr - (uintptr_t)dlinfo.dli_fbase));
3314 } else {
3315 st->print("<absolute address>");
3316 }
3317 if (dlinfo.dli_fname != NULL) {
3318 st->print(" in %s", dlinfo.dli_fname);
3319 }
3320 if (dlinfo.dli_fbase != NULL) {
3321 st->print(" at " INTPTR_FORMAT, (intptr_t)dlinfo.dli_fbase);
3322 }
3323 st->cr();
3324
3325 if (Verbose) {
3326 // decode some bytes around the PC
3327 address begin = clamp_address_in_page(addr-40, addr, os::vm_page_size());
3328 address end = clamp_address_in_page(addr+40, addr, os::vm_page_size());
3329 address lowest = (address) dlinfo.dli_sname;
3330 if (!lowest) lowest = (address) dlinfo.dli_fbase;
3331 if (begin < lowest) begin = lowest;
3332 Dl_info dlinfo2;
3333 if (dladdr(end, &dlinfo2) != 0 && dlinfo2.dli_saddr != dlinfo.dli_saddr
3334 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) {
3335 end = (address) dlinfo2.dli_saddr;
3336 }
3337 Disassembler::decode(begin, end, st);
3338 }
3339 return true;
3340 }
3341 return false;
3342 }
3343
3344 ////////////////////////////////////////////////////////////////////////////////
3345 // misc
3346
3347 // This does not do anything on Bsd. This is basically a hook for being
3348 // able to use structured exception handling (thread-local exception filters)
3349 // on, e.g., Win32.
3350 void os::os_exception_wrapper(java_call_t f, JavaValue* value,
3351 const methodHandle& method, JavaCallArguments* args,
3352 Thread* thread) {
3353 f(value, method, args, thread);
3354 }
3355
3356 void os::print_statistics() {
3357 }
3358
3359 bool os::message_box(const char* title, const char* message) {
3360 int i;
3361 fdStream err(defaultStream::error_fd());
3362 for (i = 0; i < 78; i++) err.print_raw("=");
3363 err.cr();
3364 err.print_raw_cr(title);
3365 for (i = 0; i < 78; i++) err.print_raw("-");
3366 err.cr();
3367 err.print_raw_cr(message);
3368 for (i = 0; i < 78; i++) err.print_raw("=");
3369 err.cr();
3370
3371 char buf[16];
3372 // Prevent process from exiting upon "read error" without consuming all CPU
3373 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); }
3374
3375 return buf[0] == 'y' || buf[0] == 'Y';
3376 }
3377
3378 static inline struct timespec get_mtime(const char* filename) {
3379 struct stat st;
3380 int ret = os::stat(filename, &st);
3381 assert(ret == 0, "failed to stat() file '%s': %s", filename, os::strerror(errno));
3382 #ifdef __APPLE__
3383 return st.st_mtimespec;
3384 #else
3385 return st.st_mtim;
3386 #endif
3387 }
3388
3389 int os::compare_file_modified_times(const char* file1, const char* file2) {
3390 struct timespec filetime1 = get_mtime(file1);
3391 struct timespec filetime2 = get_mtime(file2);
3392 int diff = filetime1.tv_sec - filetime2.tv_sec;
3393 if (diff == 0) {
3394 return filetime1.tv_nsec - filetime2.tv_nsec;
3395 }
3396 return diff;
3397 }
3398
3399 // Is a (classpath) directory empty?
3400 bool os::dir_is_empty(const char* path) {
3401 DIR *dir = NULL;
3402 struct dirent *ptr;
3403
3404 dir = opendir(path);
3405 if (dir == NULL) return true;
3406
3407 // Scan the directory
3408 bool result = true;
3409 while (result && (ptr = readdir(dir)) != NULL) {
3410 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) {
3411 result = false;
3412 }
3413 }
3414 closedir(dir);
3415 return result;
3416 }
3417
3418 // This code originates from JDK's sysOpen and open64_w
3419 // from src/solaris/hpi/src/system_md.c
3420
3421 int os::open(const char *path, int oflag, int mode) {
3422 if (strlen(path) > MAX_PATH - 1) {
3423 errno = ENAMETOOLONG;
3424 return -1;
3425 }
3426 int fd;
3427
3428 fd = ::open(path, oflag, mode);
3429 if (fd == -1) return -1;
3430
3431 // If the open succeeded, the file might still be a directory
3432 {
3433 struct stat buf;
3434 int ret = ::fstat(fd, &buf);
3435 int st_mode = buf.st_mode;
3436
3437 if (ret != -1) {
3438 if ((st_mode & S_IFMT) == S_IFDIR) {
3439 errno = EISDIR;
3440 ::close(fd);
3441 return -1;
3442 }
3443 } else {
3444 ::close(fd);
3445 return -1;
3446 }
3447 }
3448
3449 // All file descriptors that are opened in the JVM and not
3450 // specifically destined for a subprocess should have the
3451 // close-on-exec flag set. If we don't set it, then careless 3rd
3452 // party native code might fork and exec without closing all
3453 // appropriate file descriptors (e.g. as we do in closeDescriptors in
3454 // UNIXProcess.c), and this in turn might:
3455 //
3456 // - cause end-of-file to fail to be detected on some file
3457 // descriptors, resulting in mysterious hangs, or
3458 //
3459 // - might cause an fopen in the subprocess to fail on a system
3460 // suffering from bug 1085341.
3461 //
3462 // (Yes, the default setting of the close-on-exec flag is a Unix
3463 // design flaw)
3464 //
3465 // See:
3466 // 1085341: 32-bit stdio routines should support file descriptors >255
3467 // 4843136: (process) pipe file descriptor from Runtime.exec not being closed
3468 // 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9
3469 //
3470 #ifdef FD_CLOEXEC
3471 {
3472 int flags = ::fcntl(fd, F_GETFD);
3473 if (flags != -1) {
3474 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
3475 }
3476 }
3477 #endif
3478
3479 return fd;
3480 }
3481
3482
3483 // create binary file, rewriting existing file if required
3484 int os::create_binary_file(const char* path, bool rewrite_existing) {
3485 int oflags = O_WRONLY | O_CREAT;
3486 if (!rewrite_existing) {
3487 oflags |= O_EXCL;
3488 }
3489 return ::open(path, oflags, S_IREAD | S_IWRITE);
3490 }
3491
3492 // return current position of file pointer
3493 jlong os::current_file_offset(int fd) {
3494 return (jlong)::lseek(fd, (off_t)0, SEEK_CUR);
3495 }
3496
3497 // move file pointer to the specified offset
3498 jlong os::seek_to_file_offset(int fd, jlong offset) {
3499 return (jlong)::lseek(fd, (off_t)offset, SEEK_SET);
3500 }
3501
3502 // This code originates from JDK's sysAvailable
3503 // from src/solaris/hpi/src/native_threads/src/sys_api_td.c
3504
3505 int os::available(int fd, jlong *bytes) {
3506 jlong cur, end;
3507 int mode;
3508 struct stat buf;
3509
3510 if (::fstat(fd, &buf) >= 0) {
3511 mode = buf.st_mode;
3512 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) {
3513 int n;
3514 if (::ioctl(fd, FIONREAD, &n) >= 0) {
3515 *bytes = n;
3516 return 1;
3517 }
3518 }
3519 }
3520 if ((cur = ::lseek(fd, 0L, SEEK_CUR)) == -1) {
3521 return 0;
3522 } else if ((end = ::lseek(fd, 0L, SEEK_END)) == -1) {
3523 return 0;
3524 } else if (::lseek(fd, cur, SEEK_SET) == -1) {
3525 return 0;
3526 }
3527 *bytes = end - cur;
3528 return 1;
3529 }
3530
3531 // Map a block of memory.
3532 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
3533 char *addr, size_t bytes, bool read_only,
3534 bool allow_exec) {
3535 int prot;
3536 int flags;
3537
3538 if (read_only) {
3539 prot = PROT_READ;
3540 flags = MAP_SHARED;
3541 } else {
3542 prot = PROT_READ | PROT_WRITE;
3543 flags = MAP_PRIVATE;
3544 }
3545
3546 if (allow_exec) {
3547 prot |= PROT_EXEC;
3548 }
3549
3550 if (addr != NULL) {
3551 flags |= MAP_FIXED;
3552 }
3553
3554 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags,
3555 fd, file_offset);
3556 if (mapped_address == MAP_FAILED) {
3557 return NULL;
3558 }
3559 return mapped_address;
3560 }
3561
3562
3563 // Remap a block of memory.
3564 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
3565 char *addr, size_t bytes, bool read_only,
3566 bool allow_exec) {
3567 // same as map_memory() on this OS
3568 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only,
3569 allow_exec);
3570 }
3571
3572
3573 // Unmap a block of memory.
3574 bool os::pd_unmap_memory(char* addr, size_t bytes) {
3575 return munmap(addr, bytes) == 0;
3576 }
3577
3578 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
3579 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
3580 // of a thread.
3581 //
3582 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
3583 // the fast estimate available on the platform.
3584
3585 jlong os::current_thread_cpu_time() {
3586 #ifdef __APPLE__
3587 return os::thread_cpu_time(Thread::current(), true /* user + sys */);
3588 #else
3589 Unimplemented();
3590 return 0;
3591 #endif
3592 }
3593
3594 jlong os::thread_cpu_time(Thread* thread) {
3595 #ifdef __APPLE__
3596 return os::thread_cpu_time(thread, true /* user + sys */);
3597 #else
3598 Unimplemented();
3599 return 0;
3600 #endif
3601 }
3602
3603 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
3604 #ifdef __APPLE__
3605 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
3606 #else
3607 Unimplemented();
3608 return 0;
3609 #endif
3610 }
3611
3612 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) {
3613 #ifdef __APPLE__
3614 struct thread_basic_info tinfo;
3615 mach_msg_type_number_t tcount = THREAD_INFO_MAX;
3616 kern_return_t kr;
3617 thread_t mach_thread;
3618
3619 mach_thread = thread->osthread()->thread_id();
3620 kr = thread_info(mach_thread, THREAD_BASIC_INFO, (thread_info_t)&tinfo, &tcount);
3621 if (kr != KERN_SUCCESS) {
3622 return -1;
3623 }
3624
3625 if (user_sys_cpu_time) {
3626 jlong nanos;
3627 nanos = ((jlong) tinfo.system_time.seconds + tinfo.user_time.seconds) * (jlong)1000000000;
3628 nanos += ((jlong) tinfo.system_time.microseconds + (jlong) tinfo.user_time.microseconds) * (jlong)1000;
3629 return nanos;
3630 } else {
3631 return ((jlong)tinfo.user_time.seconds * 1000000000) + ((jlong)tinfo.user_time.microseconds * (jlong)1000);
3632 }
3633 #else
3634 Unimplemented();
3635 return 0;
3636 #endif
3637 }
3638
3639
3640 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
3641 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
3642 info_ptr->may_skip_backward = false; // elapsed time not wall time
3643 info_ptr->may_skip_forward = false; // elapsed time not wall time
3644 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
3645 }
3646
3647 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
3648 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
3649 info_ptr->may_skip_backward = false; // elapsed time not wall time
3650 info_ptr->may_skip_forward = false; // elapsed time not wall time
3651 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
3652 }
3653
3654 bool os::is_thread_cpu_time_supported() {
3655 #ifdef __APPLE__
3656 return true;
3657 #else
3658 return false;
3659 #endif
3660 }
3661
3662 // System loadavg support. Returns -1 if load average cannot be obtained.
3663 // Bsd doesn't yet have a (official) notion of processor sets,
3664 // so just return the system wide load average.
3665 int os::loadavg(double loadavg[], int nelem) {
3666 return ::getloadavg(loadavg, nelem);
3667 }
3668
3669 void os::pause() {
3670 char filename[MAX_PATH];
3671 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
3672 jio_snprintf(filename, MAX_PATH, "%s", PauseAtStartupFile);
3673 } else {
3674 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
3675 }
3676
3677 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
3678 if (fd != -1) {
3679 struct stat buf;
3680 ::close(fd);
3681 while (::stat(filename, &buf) == 0) {
3682 (void)::poll(NULL, 0, 100);
3683 }
3684 } else {
3685 jio_fprintf(stderr,
3686 "Could not open pause file '%s', continuing immediately.\n", filename);
3687 }
3688 }
3689
3690 // Darwin has no "environ" in a dynamic library.
3691 #ifdef __APPLE__
3692 #include <crt_externs.h>
3693 #define environ (*_NSGetEnviron())
3694 #else
3695 extern char** environ;
3696 #endif
3697
3698 // Run the specified command in a separate process. Return its exit value,
3699 // or -1 on failure (e.g. can't fork a new process).
3700 // Unlike system(), this function can be called from signal handler. It
3701 // doesn't block SIGINT et al.
3702 int os::fork_and_exec(char* cmd, bool use_vfork_if_available) {
3703 const char * argv[4] = {"sh", "-c", cmd, NULL};
3704
3705 // fork() in BsdThreads/NPTL is not async-safe. It needs to run
3706 // pthread_atfork handlers and reset pthread library. All we need is a
3707 // separate process to execve. Make a direct syscall to fork process.
3708 // On IA64 there's no fork syscall, we have to use fork() and hope for
3709 // the best...
3710 pid_t pid = fork();
3711
3712 if (pid < 0) {
3713 // fork failed
3714 return -1;
3715
3716 } else if (pid == 0) {
3717 // child process
3718
3719 // execve() in BsdThreads will call pthread_kill_other_threads_np()
3720 // first to kill every thread on the thread list. Because this list is
3721 // not reset by fork() (see notes above), execve() will instead kill
3722 // every thread in the parent process. We know this is the only thread
3723 // in the new process, so make a system call directly.
3724 // IA64 should use normal execve() from glibc to match the glibc fork()
3725 // above.
3726 execve("/bin/sh", (char* const*)argv, environ);
3727
3728 // execve failed
3729 _exit(-1);
3730
3731 } else {
3732 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't
3733 // care about the actual exit code, for now.
3734
3735 int status;
3736
3737 // Wait for the child process to exit. This returns immediately if
3738 // the child has already exited. */
3739 while (waitpid(pid, &status, 0) < 0) {
3740 switch (errno) {
3741 case ECHILD: return 0;
3742 case EINTR: break;
3743 default: return -1;
3744 }
3745 }
3746
3747 if (WIFEXITED(status)) {
3748 // The child exited normally; get its exit code.
3749 return WEXITSTATUS(status);
3750 } else if (WIFSIGNALED(status)) {
3751 // The child exited because of a signal
3752 // The best value to return is 0x80 + signal number,
3753 // because that is what all Unix shells do, and because
3754 // it allows callers to distinguish between process exit and
3755 // process death by signal.
3756 return 0x80 + WTERMSIG(status);
3757 } else {
3758 // Unknown exit code; pass it through
3759 return status;
3760 }
3761 }
3762 }
3763
3764 // Get the default path to the core file
3765 // Returns the length of the string
3766 int os::get_core_path(char* buffer, size_t bufferSize) {
3767 int n = jio_snprintf(buffer, bufferSize, "/cores/core.%d", current_process_id());
3768
3769 // Truncate if theoretical string was longer than bufferSize
3770 n = MIN2(n, (int)bufferSize);
3771
3772 return n;
3773 }
3774
3775 bool os::supports_map_sync() {
3776 return false;
3777 }
3778
3779 #ifndef PRODUCT
3780 void TestReserveMemorySpecial_test() {
3781 // No tests available for this platform
3782 }
3783 #endif
3784
3785 bool os::start_debugging(char *buf, int buflen) {
3786 int len = (int)strlen(buf);
3787 char *p = &buf[len];
3788
3789 jio_snprintf(p, buflen-len,
3790 "\n\n"
3791 "Do you want to debug the problem?\n\n"
3792 "To debug, run 'gdb /proc/%d/exe %d'; then switch to thread " INTX_FORMAT " (" INTPTR_FORMAT ")\n"
3793 "Enter 'yes' to launch gdb automatically (PATH must include gdb)\n"
3794 "Otherwise, press RETURN to abort...",
3795 os::current_process_id(), os::current_process_id(),
3796 os::current_thread_id(), os::current_thread_id());
3797
3798 bool yes = os::message_box("Unexpected Error", buf);
3799
3800 if (yes) {
3801 // yes, user asked VM to launch debugger
3802 jio_snprintf(buf, sizeof(buf), "gdb /proc/%d/exe %d",
3803 os::current_process_id(), os::current_process_id());
3804
3805 os::fork_and_exec(buf);
3806 yes = false;
3807 }
3808 return yes;
3809 }