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 "memory/allocation.inline.hpp"
37 #include "memory/filemap.hpp"
38 #include "oops/oop.inline.hpp"
39 #include "os_bsd.inline.hpp"
40 #include "os_share_bsd.hpp"
41 #include "prims/jniFastGetField.hpp"
42 #include "prims/jvm_misc.hpp"
43 #include "runtime/arguments.hpp"
44 #include "runtime/atomic.hpp"
45 #include "runtime/extendedPC.hpp"
46 #include "runtime/globals.hpp"
47 #include "runtime/interfaceSupport.inline.hpp"
48 #include "runtime/java.hpp"
49 #include "runtime/javaCalls.hpp"
50 #include "runtime/mutexLocker.hpp"
51 #include "runtime/objectMonitor.hpp"
52 #include "runtime/orderAccess.hpp"
53 #include "runtime/osThread.hpp"
54 #include "runtime/perfMemory.hpp"
55 #include "runtime/semaphore.hpp"
56 #include "runtime/sharedRuntime.hpp"
57 #include "runtime/statSampler.hpp"
58 #include "runtime/stubRoutines.hpp"
59 #include "runtime/thread.inline.hpp"
60 #include "runtime/threadCritical.hpp"
61 #include "runtime/timer.hpp"
62 #include "services/attachListener.hpp"
63 #include "services/memTracker.hpp"
64 #include "services/runtimeService.hpp"
65 #include "utilities/align.hpp"
66 #include "utilities/decoder.hpp"
67 #include "utilities/defaultStream.hpp"
68 #include "utilities/events.hpp"
69 #include "utilities/growableArray.hpp"
70 #include "utilities/vmError.hpp"
71
72 // put OS-includes here
73 # include <dlfcn.h>
74 # include <errno.h>
75 # include <fcntl.h>
76 # include <inttypes.h>
77 # include <poll.h>
78 # include <pthread.h>
79 # include <pwd.h>
80 # include <signal.h>
81 # include <stdint.h>
82 # include <stdio.h>
83 # include <string.h>
84 # include <sys/ioctl.h>
85 # include <sys/mman.h>
86 # include <sys/param.h>
87 # include <sys/resource.h>
88 # include <sys/socket.h>
89 # include <sys/stat.h>
90 # include <sys/syscall.h>
91 # include <sys/sysctl.h>
92 # include <sys/time.h>
93 # include <sys/times.h>
94 # include <sys/types.h>
95 # include <sys/wait.h>
96 # include <time.h>
97 # include <unistd.h>
98
99 #if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__DragonFly__)
100 #include <elf.h>
101 #endif
102
103 #if defined(__FreeBSD__) || defined(__DragonFly__)
104 #include <pthread_np.h>
105 #include <sys/link_elf.h>
106 #include <vm/vm_param.h>
107 #endif
108
109 #if defined(__OpenBSD__) || defined(__DragonFly__)
110 # include <pthread_np.h>
111 #endif
112
113 #ifdef __APPLE__
114 #include <mach-o/dyld.h>
115 #endif
116
117 #ifndef MAP_ANONYMOUS
118 #define MAP_ANONYMOUS MAP_ANON
119 #endif
120
121 #ifndef MAP_NORESERVE
122 #define MAP_NORESERVE 0
123 #endif
124
125 #define MAX_PATH (2 * K)
126
127 // for timer info max values which include all bits
128 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF)
129
130 ////////////////////////////////////////////////////////////////////////////////
131 // global variables
132 julong os::Bsd::_physical_memory = 0;
133
134 #ifdef __APPLE__
135 mach_timebase_info_data_t os::Bsd::_timebase_info = {0, 0};
136 volatile uint64_t os::Bsd::_max_abstime = 0;
137 #else
138 int (*os::Bsd::_clock_gettime)(clockid_t, struct timespec *) = NULL;
139 int (*os::Bsd::_getcpuclockid)(pthread_t, clockid_t *) = NULL;
140 #endif
141 pthread_t os::Bsd::_main_thread;
142 int os::Bsd::_page_size = -1;
143
144 static jlong initial_time_count=0;
145
146 static int clock_tics_per_sec = 100;
147
148 // For diagnostics to print a message once. see run_periodic_checks
149 static sigset_t check_signal_done;
150 static bool check_signals = true;
151
152 static pid_t _initial_pid = 0;
153
154 // Signal number used to suspend/resume a thread
155
156 // do not use any signal number less than SIGSEGV, see 4355769
157 static int SR_signum = SIGUSR2;
158 sigset_t SR_sigset;
159
160
161 ////////////////////////////////////////////////////////////////////////////////
162 // utility functions
163
164 static int SR_initialize();
165
available_memory()166 julong os::available_memory() {
167 return Bsd::available_memory();
168 }
169
170 // available here means free
available_memory()171 julong os::Bsd::available_memory() {
172 uint64_t available = physical_memory() >> 2;
173 #ifdef __APPLE__
174 mach_msg_type_number_t count = HOST_VM_INFO64_COUNT;
175 vm_statistics64_data_t vmstat;
176 kern_return_t kerr = host_statistics64(mach_host_self(), HOST_VM_INFO64,
177 (host_info64_t)&vmstat, &count);
178 assert(kerr == KERN_SUCCESS,
179 "host_statistics64 failed - check mach_host_self() and count");
180 if (kerr == KERN_SUCCESS) {
181 available = vmstat.free_count * os::vm_page_size();
182 }
183 #elif defined(__FreeBSD__) || defined(__DragonFly__)
184 static const char *vm_stats[] = {
185 "vm.stats.vm.v_free_count",
186 "vm.stats.vm.v_cache_count",
187 "vm.stats.vm.v_inactive_count"
188 };
189 size_t size;
190 julong free_pages;
191 #ifdef __DragonFly__
192 u_long i, npages;
193 #else
194 u_int i, npages;
195 #endif
196
197 for (i = 0, free_pages = 0; i < sizeof(vm_stats) / sizeof(vm_stats[0]); i++) {
198 size = sizeof(npages);
199 if (sysctlbyname(vm_stats[i], &npages, &size, NULL, 0) == -1) {
200 free_pages = 0;
201 break;
202 }
203 free_pages += npages;
204 }
205 if (free_pages > 0)
206 available = free_pages * os::vm_page_size();
207 #endif
208 return available;
209 }
210
physical_memory()211 julong os::physical_memory() {
212 return Bsd::physical_memory();
213 }
214
215 // Return true if user is running as root.
216
have_special_privileges()217 bool os::have_special_privileges() {
218 static bool init = false;
219 static bool privileges = false;
220 if (!init) {
221 #ifdef __APPLE__
222 privileges = (getuid() != geteuid()) || (getgid() != getegid());
223 #else
224 privileges = issetugid();
225 #endif
226 init = true;
227 }
228 return privileges;
229 }
230
231
232
233 // Cpu architecture string
234 #if defined(ZERO)
235 static char cpu_arch[] = ZERO_LIBARCH;
236 #elif defined(IA64)
237 static char cpu_arch[] = "ia64";
238 #elif defined(IA32)
239 static char cpu_arch[] = "i386";
240 #elif defined(AMD64)
241 static char cpu_arch[] = "amd64";
242 #elif defined(ARM)
243 static char cpu_arch[] = "arm";
244 #elif defined(PPC32)
245 static char cpu_arch[] = "ppc";
246 #elif defined(PPC64)
247 static char cpu_arch[] = "ppc64";
248 #elif defined(SPARC)
249 #ifdef _LP64
250 static char cpu_arch[] = "sparcv9";
251 #else
252 static char cpu_arch[] = "sparc";
253 #endif
254 #elif defined(AARCH64)
255 static char cpu_arch[] = "aarch64";
256 #else
257 #error Add appropriate cpu_arch setting
258 #endif
259
260 // Compiler variant
261 #ifdef COMPILER2
262 #define COMPILER_VARIANT "server"
263 #else
264 #define COMPILER_VARIANT "client"
265 #endif
266
267
initialize_system_info()268 void os::Bsd::initialize_system_info() {
269 int mib[2];
270 size_t len;
271 int cpu_val;
272 #if defined (HW_MEMSIZE) // Apple
273 uint64_t mem_val;
274 #define MEMMIB HW_MEMSIZE;
275 #elif defined(HW_PHYSMEM64) // OpenBSD & NetBSD
276 int64_t mem_val;
277 #define MEMMIB HW_PHYSMEM64;
278 #elif defined(HW_PHYSMEM) // FreeBSD
279 unsigned long mem_val;
280 #define MEMMIB HW_PHYSMEM;
281 #else
282 #error No ways to get physmem
283 #endif
284
285 // get processors count via hw.ncpus sysctl
286 mib[0] = CTL_HW;
287 mib[1] = HW_NCPU;
288 len = sizeof(cpu_val);
289 if (sysctl(mib, 2, &cpu_val, &len, NULL, 0) != -1 && cpu_val >= 1) {
290 assert(len == sizeof(cpu_val), "unexpected data size");
291 set_processor_count(cpu_val);
292 } else {
293 set_processor_count(1); // fallback
294 }
295
296 // get physical memory via sysctl
297 mib[0] = CTL_HW;
298 mib[1] = MEMMIB;
299
300 len = sizeof(mem_val);
301 if (sysctl(mib, 2, &mem_val, &len, NULL, 0) != -1) {
302 assert(len == sizeof(mem_val), "unexpected data size");
303 _physical_memory = mem_val;
304 } else {
305 _physical_memory = 256 * 1024 * 1024; // fallback (XXXBSD?)
306 }
307
308 #ifdef __OpenBSD__
309 {
310 // limit _physical_memory memory view on OpenBSD since
311 // datasize rlimit restricts us anyway.
312 struct rlimit limits;
313 getrlimit(RLIMIT_DATA, &limits);
314 _physical_memory = MIN2(_physical_memory, (julong)limits.rlim_cur);
315 }
316 #endif
317 }
318
319 #ifdef __APPLE__
get_home()320 static const char *get_home() {
321 const char *home_dir = ::getenv("HOME");
322 if ((home_dir == NULL) || (*home_dir == '\0')) {
323 struct passwd *passwd_info = getpwuid(geteuid());
324 if (passwd_info != NULL) {
325 home_dir = passwd_info->pw_dir;
326 }
327 }
328
329 return home_dir;
330 }
331 #endif
332
init_system_properties_values()333 void os::init_system_properties_values() {
334 // The next steps are taken in the product version:
335 //
336 // Obtain the JAVA_HOME value from the location of libjvm.so.
337 // This library should be located at:
338 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm.so.
339 //
340 // If "/jre/lib/" appears at the right place in the path, then we
341 // assume libjvm.so is installed in a JDK and we use this path.
342 //
343 // Otherwise exit with message: "Could not create the Java virtual machine."
344 //
345 // The following extra steps are taken in the debugging version:
346 //
347 // If "/jre/lib/" does NOT appear at the right place in the path
348 // instead of exit check for $JAVA_HOME environment variable.
349 //
350 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>,
351 // then we append a fake suffix "hotspot/libjvm.so" to this path so
352 // it looks like libjvm.so is installed there
353 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm.so.
354 //
355 // Otherwise exit.
356 //
357 // Important note: if the location of libjvm.so changes this
358 // code needs to be changed accordingly.
359
360 // See ld(1):
361 // The linker uses the following search paths to locate required
362 // shared libraries:
363 // 1: ...
364 // ...
365 // 7: The default directories, normally /lib and /usr/lib.
366 #ifndef DEFAULT_LIBPATH
367 #ifndef OVERRIDE_LIBPATH
368 #ifdef __APPLE__
369 #define DEFAULT_LIBPATH "/lib:/usr/lib"
370 #elif defined(__NetBSD__)
371 #define DEFAULT_LIBPATH "/usr/lib:/usr/pkg/lib"
372 #else
373 #define DEFAULT_LIBPATH "/usr/lib:/usr/local/lib"
374 #endif
375 #else
376 #define DEFAULT_LIBPATH OVERRIDE_LIBPATH
377 #endif
378 #endif
379
380 // Base path of extensions installed on the system.
381 #define SYS_EXT_DIR "/usr/java/packages"
382 #define EXTENSIONS_DIR "/lib/ext"
383
384 #ifndef __APPLE__
385
386 // Buffer that fits several sprintfs.
387 // Note that the space for the colon and the trailing null are provided
388 // by the nulls included by the sizeof operator.
389 const size_t bufsize =
390 MAX2((size_t)MAXPATHLEN, // For dll_dir & friends.
391 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR) + sizeof(SYS_EXT_DIR) + sizeof(EXTENSIONS_DIR)); // extensions dir
392 char *buf = (char *)NEW_C_HEAP_ARRAY(char, bufsize, mtInternal);
393
394 // sysclasspath, java_home, dll_dir
395 {
396 char *pslash;
397 os::jvm_path(buf, bufsize);
398
399 // Found the full path to libjvm.so.
400 // Now cut the path to <java_home>/jre if we can.
401 pslash = strrchr(buf, '/');
402 if (pslash != NULL) {
403 *pslash = '\0'; // Get rid of /libjvm.so.
404 }
405 pslash = strrchr(buf, '/');
406 if (pslash != NULL) {
407 *pslash = '\0'; // Get rid of /{client|server|hotspot}.
408 }
409 Arguments::set_dll_dir(buf);
410
411 if (pslash != NULL) {
412 pslash = strrchr(buf, '/');
413 if (pslash != NULL) {
414 *pslash = '\0'; // Get rid of /lib.
415 }
416 }
417 Arguments::set_java_home(buf);
418 if (!set_boot_path('/', ':')) {
419 vm_exit_during_initialization("Failed setting boot class path.", NULL);
420 }
421 }
422
423 // Where to look for native libraries.
424 //
425 // Note: Due to a legacy implementation, most of the library path
426 // is set in the launcher. This was to accomodate linking restrictions
427 // on legacy Bsd implementations (which are no longer supported).
428 // Eventually, all the library path setting will be done here.
429 //
430 // However, to prevent the proliferation of improperly built native
431 // libraries, the new path component /usr/java/packages is added here.
432 // Eventually, all the library path setting will be done here.
433 {
434 // Get the user setting of LD_LIBRARY_PATH, and prepended it. It
435 // should always exist (until the legacy problem cited above is
436 // addressed).
437 const char *v = ::getenv("LD_LIBRARY_PATH");
438 const char *v_colon = ":";
439 if (v == NULL) { v = ""; v_colon = ""; }
440 // That's +1 for the colon and +1 for the trailing '\0'.
441 char *ld_library_path = (char *)NEW_C_HEAP_ARRAY(char,
442 strlen(v) + 1 +
443 sizeof(DEFAULT_LIBPATH) + 1,
444 mtInternal);
445 sprintf(ld_library_path, "%s%s" DEFAULT_LIBPATH, v, v_colon);
446
447 Arguments::set_library_path(ld_library_path);
448 FREE_C_HEAP_ARRAY(char, ld_library_path);
449 }
450
451 // Extensions directories.
452 sprintf(buf, "%s" EXTENSIONS_DIR ":" SYS_EXT_DIR EXTENSIONS_DIR, Arguments::get_java_home());
453 Arguments::set_ext_dirs(buf);
454
455 FREE_C_HEAP_ARRAY(char, buf);
456
457 #else // __APPLE__
458
459 #define SYS_EXTENSIONS_DIR "/Library/Java/Extensions"
460 #define SYS_EXTENSIONS_DIRS SYS_EXTENSIONS_DIR ":/Network" SYS_EXTENSIONS_DIR ":/System" SYS_EXTENSIONS_DIR ":/usr/lib/java"
461
462 const char *user_home_dir = get_home();
463 // The null in SYS_EXTENSIONS_DIRS counts for the size of the colon after user_home_dir.
464 size_t system_ext_size = strlen(user_home_dir) + sizeof(SYS_EXTENSIONS_DIR) +
465 sizeof(SYS_EXTENSIONS_DIRS);
466
467 // Buffer that fits several sprintfs.
468 // Note that the space for the colon and the trailing null are provided
469 // by the nulls included by the sizeof operator.
470 const size_t bufsize =
471 MAX2((size_t)MAXPATHLEN, // for dll_dir & friends.
472 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR) + system_ext_size); // extensions dir
473 char *buf = (char *)NEW_C_HEAP_ARRAY(char, bufsize, mtInternal);
474
475 // sysclasspath, java_home, dll_dir
476 {
477 char *pslash;
478 os::jvm_path(buf, bufsize);
479
480 // Found the full path to libjvm.so.
481 // Now cut the path to <java_home>/jre if we can.
482 *(strrchr(buf, '/')) = '\0'; // Get rid of /libjvm.so.
483 pslash = strrchr(buf, '/');
484 if (pslash != NULL) {
485 *pslash = '\0'; // Get rid of /{client|server|hotspot}.
486 }
487 #ifdef STATIC_BUILD
488 strcat(buf, "/lib");
489 #endif
490
491 Arguments::set_dll_dir(buf);
492
493 if (pslash != NULL) {
494 pslash = strrchr(buf, '/');
495 if (pslash != NULL) {
496 *pslash = '\0'; // Get rid of /lib.
497 }
498 }
499 Arguments::set_java_home(buf);
500 set_boot_path('/', ':');
501 }
502
503 // Where to look for native libraries.
504 //
505 // Note: Due to a legacy implementation, most of the library path
506 // is set in the launcher. This was to accomodate linking restrictions
507 // on legacy Bsd implementations (which are no longer supported).
508 // Eventually, all the library path setting will be done here.
509 //
510 // However, to prevent the proliferation of improperly built native
511 // libraries, the new path component /usr/java/packages is added here.
512 // Eventually, all the library path setting will be done here.
513 {
514 // Get the user setting of LD_LIBRARY_PATH, and prepended it. It
515 // should always exist (until the legacy problem cited above is
516 // addressed).
517 // Prepend the default path with the JAVA_LIBRARY_PATH so that the app launcher code
518 // can specify a directory inside an app wrapper
519 const char *l = ::getenv("JAVA_LIBRARY_PATH");
520 const char *l_colon = ":";
521 if (l == NULL) { l = ""; l_colon = ""; }
522
523 const char *v = ::getenv("DYLD_LIBRARY_PATH");
524 const char *v_colon = ":";
525 if (v == NULL) { v = ""; v_colon = ""; }
526
527 // Apple's Java6 has "." at the beginning of java.library.path.
528 // OpenJDK on Windows has "." at the end of java.library.path.
529 // OpenJDK on Linux and Solaris don't have "." in java.library.path
530 // at all. To ease the transition from Apple's Java6 to OpenJDK7,
531 // "." is appended to the end of java.library.path. Yes, this
532 // could cause a change in behavior, but Apple's Java6 behavior
533 // can be achieved by putting "." at the beginning of the
534 // JAVA_LIBRARY_PATH environment variable.
535 char *ld_library_path = (char *)NEW_C_HEAP_ARRAY(char,
536 strlen(v) + 1 + strlen(l) + 1 +
537 system_ext_size + 3,
538 mtInternal);
539 sprintf(ld_library_path, "%s%s%s%s%s" SYS_EXTENSIONS_DIR ":" SYS_EXTENSIONS_DIRS ":.",
540 v, v_colon, l, l_colon, user_home_dir);
541 Arguments::set_library_path(ld_library_path);
542 FREE_C_HEAP_ARRAY(char, ld_library_path);
543 }
544
545 // Extensions directories.
546 //
547 // Note that the space for the colon and the trailing null are provided
548 // by the nulls included by the sizeof operator (so actually one byte more
549 // than necessary is allocated).
550 sprintf(buf, "%s" SYS_EXTENSIONS_DIR ":%s" EXTENSIONS_DIR ":" SYS_EXTENSIONS_DIRS,
551 user_home_dir, Arguments::get_java_home());
552 Arguments::set_ext_dirs(buf);
553
554 FREE_C_HEAP_ARRAY(char, buf);
555
556 #undef SYS_EXTENSIONS_DIR
557 #undef SYS_EXTENSIONS_DIRS
558
559 #endif // __APPLE__
560
561 #undef SYS_EXT_DIR
562 #undef EXTENSIONS_DIR
563 }
564
565 ////////////////////////////////////////////////////////////////////////////////
566 // breakpoint support
567
breakpoint()568 void os::breakpoint() {
569 BREAKPOINT;
570 }
571
breakpoint()572 extern "C" void breakpoint() {
573 // use debugger to set breakpoint here
574 }
575
576 ////////////////////////////////////////////////////////////////////////////////
577 // signal support
578
579 debug_only(static bool signal_sets_initialized = false);
580 static sigset_t unblocked_sigs, vm_sigs;
581
signal_sets_init()582 void os::Bsd::signal_sets_init() {
583 // Should also have an assertion stating we are still single-threaded.
584 assert(!signal_sets_initialized, "Already initialized");
585 // Fill in signals that are necessarily unblocked for all threads in
586 // the VM. Currently, we unblock the following signals:
587 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden
588 // by -Xrs (=ReduceSignalUsage));
589 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all
590 // other threads. The "ReduceSignalUsage" boolean tells us not to alter
591 // the dispositions or masks wrt these signals.
592 // Programs embedding the VM that want to use the above signals for their
593 // own purposes must, at this time, use the "-Xrs" option to prevent
594 // interference with shutdown hooks and BREAK_SIGNAL thread dumping.
595 // (See bug 4345157, and other related bugs).
596 // In reality, though, unblocking these signals is really a nop, since
597 // these signals are not blocked by default.
598 sigemptyset(&unblocked_sigs);
599 sigaddset(&unblocked_sigs, SIGILL);
600 sigaddset(&unblocked_sigs, SIGSEGV);
601 sigaddset(&unblocked_sigs, SIGBUS);
602 sigaddset(&unblocked_sigs, SIGFPE);
603 #if defined(PPC64)
604 sigaddset(&unblocked_sigs, SIGTRAP);
605 #endif
606 sigaddset(&unblocked_sigs, SR_signum);
607
608 if (!ReduceSignalUsage) {
609 if (!os::Posix::is_sig_ignored(SHUTDOWN1_SIGNAL)) {
610 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL);
611
612 }
613 if (!os::Posix::is_sig_ignored(SHUTDOWN2_SIGNAL)) {
614 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL);
615 }
616 if (!os::Posix::is_sig_ignored(SHUTDOWN3_SIGNAL)) {
617 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL);
618 }
619 }
620 // Fill in signals that are blocked by all but the VM thread.
621 sigemptyset(&vm_sigs);
622 if (!ReduceSignalUsage) {
623 sigaddset(&vm_sigs, BREAK_SIGNAL);
624 }
625 debug_only(signal_sets_initialized = true);
626
627 }
628
629 // These are signals that are unblocked while a thread is running Java.
630 // (For some reason, they get blocked by default.)
unblocked_signals()631 sigset_t* os::Bsd::unblocked_signals() {
632 assert(signal_sets_initialized, "Not initialized");
633 return &unblocked_sigs;
634 }
635
636 // These are the signals that are blocked while a (non-VM) thread is
637 // running Java. Only the VM thread handles these signals.
vm_signals()638 sigset_t* os::Bsd::vm_signals() {
639 assert(signal_sets_initialized, "Not initialized");
640 return &vm_sigs;
641 }
642
hotspot_sigmask(Thread * thread)643 void os::Bsd::hotspot_sigmask(Thread* thread) {
644
645 //Save caller's signal mask before setting VM signal mask
646 sigset_t caller_sigmask;
647 pthread_sigmask(SIG_BLOCK, NULL, &caller_sigmask);
648
649 OSThread* osthread = thread->osthread();
650 osthread->set_caller_sigmask(caller_sigmask);
651
652 pthread_sigmask(SIG_UNBLOCK, os::Bsd::unblocked_signals(), NULL);
653
654 if (!ReduceSignalUsage) {
655 if (thread->is_VM_thread()) {
656 // Only the VM thread handles BREAK_SIGNAL ...
657 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL);
658 } else {
659 // ... all other threads block BREAK_SIGNAL
660 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL);
661 }
662 }
663 }
664
665
666 //////////////////////////////////////////////////////////////////////////////
667 // create new thread
668
669 #ifdef __APPLE__
670 // library handle for calling objc_registerThreadWithCollector()
671 // without static linking to the libobjc library
672 #define OBJC_LIB "/usr/lib/libobjc.dylib"
673 #define OBJC_GCREGISTER "objc_registerThreadWithCollector"
674 typedef void (*objc_registerThreadWithCollector_t)();
675 extern "C" objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction;
676 objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction = NULL;
677 #endif
678
679 #ifdef __APPLE__
locate_unique_thread_id(mach_port_t mach_thread_port)680 static uint64_t locate_unique_thread_id(mach_port_t mach_thread_port) {
681 // Additional thread_id used to correlate threads in SA
682 thread_identifier_info_data_t m_ident_info;
683 mach_msg_type_number_t count = THREAD_IDENTIFIER_INFO_COUNT;
684
685 thread_info(mach_thread_port, THREAD_IDENTIFIER_INFO,
686 (thread_info_t) &m_ident_info, &count);
687
688 return m_ident_info.thread_id;
689 }
690 #endif
691
692 // Thread start routine for all newly created threads
thread_native_entry(Thread * thread)693 static void *thread_native_entry(Thread *thread) {
694
695 thread->record_stack_base_and_size();
696
697 // Try to randomize the cache line index of hot stack frames.
698 // This helps when threads of the same stack traces evict each other's
699 // cache lines. The threads can be either from the same JVM instance, or
700 // from different JVM instances. The benefit is especially true for
701 // processors with hyperthreading technology.
702 static int counter = 0;
703 int pid = os::current_process_id();
704 alloca(((pid ^ counter++) & 7) * 128);
705
706 thread->initialize_thread_current();
707
708 OSThread* osthread = thread->osthread();
709 Monitor* sync = osthread->startThread_lock();
710
711 osthread->set_thread_id(os::Bsd::gettid());
712
713 log_info(os, thread)("Thread is alive (tid: " UINTX_FORMAT ", pthread id: " UINTX_FORMAT ").",
714 os::current_thread_id(), (uintx) pthread_self());
715
716 #ifdef __APPLE__
717 uint64_t unique_thread_id = locate_unique_thread_id(osthread->thread_id());
718 guarantee(unique_thread_id != 0, "unique thread id was not found");
719 osthread->set_unique_thread_id(unique_thread_id);
720 #endif
721 // initialize signal mask for this thread
722 os::Bsd::hotspot_sigmask(thread);
723
724 // initialize floating point control register
725 os::Bsd::init_thread_fpu_state();
726
727 #ifdef __APPLE__
728 // register thread with objc gc
729 if (objc_registerThreadWithCollectorFunction != NULL) {
730 objc_registerThreadWithCollectorFunction();
731 }
732 #endif
733
734 // handshaking with parent thread
735 {
736 MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag);
737
738 // notify parent thread
739 osthread->set_state(INITIALIZED);
740 sync->notify_all();
741
742 // wait until os::start_thread()
743 while (osthread->get_state() == INITIALIZED) {
744 sync->wait(Mutex::_no_safepoint_check_flag);
745 }
746 }
747
748 // call one more level start routine
749 thread->call_run();
750
751 // Note: at this point the thread object may already have deleted itself.
752 // Prevent dereferencing it from here on out.
753 thread = NULL;
754
755 log_info(os, thread)("Thread finished (tid: " UINTX_FORMAT ", pthread id: " UINTX_FORMAT ").",
756 os::current_thread_id(), (uintx) pthread_self());
757
758 return 0;
759 }
760
create_thread(Thread * thread,ThreadType thr_type,size_t req_stack_size)761 bool os::create_thread(Thread* thread, ThreadType thr_type,
762 size_t req_stack_size) {
763 assert(thread->osthread() == NULL, "caller responsible");
764
765 // Allocate the OSThread object
766 OSThread* osthread = new OSThread(NULL, NULL);
767 if (osthread == NULL) {
768 return false;
769 }
770
771 // set the correct thread state
772 osthread->set_thread_type(thr_type);
773
774 // Initial state is ALLOCATED but not INITIALIZED
775 osthread->set_state(ALLOCATED);
776
777 thread->set_osthread(osthread);
778
779 // init thread attributes
780 pthread_attr_t attr;
781 pthread_attr_init(&attr);
782 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
783
784 // calculate stack size if it's not specified by caller
785 size_t stack_size = os::Posix::get_initial_stack_size(thr_type, req_stack_size);
786 int status = pthread_attr_setstacksize(&attr, stack_size);
787 assert_status(status == 0, status, "pthread_attr_setstacksize");
788
789 ThreadState state;
790
791 {
792 pthread_t tid;
793 int ret = pthread_create(&tid, &attr, (void* (*)(void*)) thread_native_entry, thread);
794
795 char buf[64];
796 if (ret == 0) {
797 log_info(os, thread)("Thread started (pthread id: " UINTX_FORMAT ", attributes: %s). ",
798 (uintx) tid, os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr));
799 } else {
800 log_warning(os, thread)("Failed to start thread - pthread_create failed (%s) for attributes: %s.",
801 os::errno_name(ret), os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr));
802 }
803
804 pthread_attr_destroy(&attr);
805
806 if (ret != 0) {
807 // Need to clean up stuff we've allocated so far
808 thread->set_osthread(NULL);
809 delete osthread;
810 return false;
811 }
812
813 // Store pthread info into the OSThread
814 osthread->set_pthread_id(tid);
815
816 // Wait until child thread is either initialized or aborted
817 {
818 Monitor* sync_with_child = osthread->startThread_lock();
819 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag);
820 while ((state = osthread->get_state()) == ALLOCATED) {
821 sync_with_child->wait(Mutex::_no_safepoint_check_flag);
822 }
823 }
824
825 }
826
827 // Aborted due to thread limit being reached
828 if (state == ZOMBIE) {
829 thread->set_osthread(NULL);
830 delete osthread;
831 return false;
832 }
833
834 // The thread is returned suspended (in state INITIALIZED),
835 // and is started higher up in the call chain
836 assert(state == INITIALIZED, "race condition");
837 return true;
838 }
839
840 /////////////////////////////////////////////////////////////////////////////
841 // attach existing thread
842
843 // bootstrap the main thread
create_main_thread(JavaThread * thread)844 bool os::create_main_thread(JavaThread* thread) {
845 assert(os::Bsd::_main_thread == pthread_self(), "should be called inside main thread");
846 return create_attached_thread(thread);
847 }
848
create_attached_thread(JavaThread * thread)849 bool os::create_attached_thread(JavaThread* thread) {
850 #ifdef ASSERT
851 thread->verify_not_published();
852 #endif
853
854 // Allocate the OSThread object
855 OSThread* osthread = new OSThread(NULL, NULL);
856
857 if (osthread == NULL) {
858 return false;
859 }
860
861 osthread->set_thread_id(os::Bsd::gettid());
862
863 // Store pthread info into the OSThread
864 #ifdef __APPLE__
865 uint64_t unique_thread_id = locate_unique_thread_id(osthread->thread_id());
866 guarantee(unique_thread_id != 0, "just checking");
867 osthread->set_unique_thread_id(unique_thread_id);
868 #endif
869 osthread->set_pthread_id(::pthread_self());
870
871 // initialize floating point control register
872 os::Bsd::init_thread_fpu_state();
873
874 // Initial thread state is RUNNABLE
875 osthread->set_state(RUNNABLE);
876
877 thread->set_osthread(osthread);
878
879 // initialize signal mask for this thread
880 // and save the caller's signal mask
881 os::Bsd::hotspot_sigmask(thread);
882
883 log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ", pthread id: " UINTX_FORMAT ").",
884 os::current_thread_id(), (uintx) pthread_self());
885
886 return true;
887 }
888
pd_start_thread(Thread * thread)889 void os::pd_start_thread(Thread* thread) {
890 OSThread * osthread = thread->osthread();
891 assert(osthread->get_state() != INITIALIZED, "just checking");
892 Monitor* sync_with_child = osthread->startThread_lock();
893 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag);
894 sync_with_child->notify();
895 }
896
897 // Free Bsd resources related to the OSThread
free_thread(OSThread * osthread)898 void os::free_thread(OSThread* osthread) {
899 assert(osthread != NULL, "osthread not set");
900
901 // We are told to free resources of the argument thread,
902 // but we can only really operate on the current thread.
903 assert(Thread::current()->osthread() == osthread,
904 "os::free_thread but not current thread");
905
906 // Restore caller's signal mask
907 sigset_t sigmask = osthread->caller_sigmask();
908 pthread_sigmask(SIG_SETMASK, &sigmask, NULL);
909
910 delete osthread;
911 }
912
913 ////////////////////////////////////////////////////////////////////////////////
914 // time support
915
916 // Time since start-up in seconds to a fine granularity.
917 // Used by VMSelfDestructTimer and the MemProfiler.
elapsedTime()918 double os::elapsedTime() {
919
920 return ((double)os::elapsed_counter()) / os::elapsed_frequency();
921 }
922
elapsed_counter()923 jlong os::elapsed_counter() {
924 return javaTimeNanos() - initial_time_count;
925 }
926
elapsed_frequency()927 jlong os::elapsed_frequency() {
928 return NANOSECS_PER_SEC; // nanosecond resolution
929 }
930
supports_vtime()931 bool os::supports_vtime() { return true; }
enable_vtime()932 bool os::enable_vtime() { return false; }
vtime_enabled()933 bool os::vtime_enabled() { return false; }
934
elapsedVTime()935 double os::elapsedVTime() {
936 #ifdef RUSAGE_THREAD
937 struct rusage usage;
938 int retval = getrusage(RUSAGE_THREAD, &usage);
939 if (retval == 0) {
940 return (double) (usage.ru_utime.tv_sec + usage.ru_stime.tv_sec) + (double) (usage.ru_utime.tv_usec + usage.ru_stime.tv_usec) / (1000 * 1000);
941 }
942 #endif
943 // better than nothing, but not much
944 return elapsedTime();
945 }
946
javaTimeMillis()947 jlong os::javaTimeMillis() {
948 timeval time;
949 int status = gettimeofday(&time, NULL);
950 assert(status != -1, "bsd error");
951 return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000);
952 }
953
javaTimeSystemUTC(jlong & seconds,jlong & nanos)954 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) {
955 timeval time;
956 int status = gettimeofday(&time, NULL);
957 assert(status != -1, "bsd error");
958 seconds = jlong(time.tv_sec);
959 nanos = jlong(time.tv_usec) * 1000;
960 }
961
962 #ifndef __APPLE__
963 #ifndef CLOCK_MONOTONIC
964 #define CLOCK_MONOTONIC (1)
965 #endif
966 #endif
967
968 #ifdef __APPLE__
clock_init()969 void os::Bsd::clock_init() {
970 mach_timebase_info(&_timebase_info);
971 }
972 #else
clock_init()973 void os::Bsd::clock_init() {
974 struct timespec res;
975 struct timespec tp;
976 _getcpuclockid = (int (*)(pthread_t, clockid_t *))dlsym(RTLD_DEFAULT, "pthread_getcpuclockid");
977 if (::clock_getres(CLOCK_MONOTONIC, &res) == 0 &&
978 ::clock_gettime(CLOCK_MONOTONIC, &tp) == 0) {
979 // yes, monotonic clock is supported
980 _clock_gettime = ::clock_gettime;
981 return;
982 }
983 warning("No monotonic clock was available - timed services may " \
984 "be adversely affected if the time-of-day clock changes");
985 }
986 #endif
987
988
989
990 #ifdef __APPLE__
991
javaTimeNanos()992 jlong os::javaTimeNanos() {
993 const uint64_t tm = mach_absolute_time();
994 const uint64_t now = (tm * Bsd::_timebase_info.numer) / Bsd::_timebase_info.denom;
995 const uint64_t prev = Bsd::_max_abstime;
996 if (now <= prev) {
997 return prev; // same or retrograde time;
998 }
999 const uint64_t obsv = Atomic::cmpxchg(now, &Bsd::_max_abstime, prev);
1000 assert(obsv >= prev, "invariant"); // Monotonicity
1001 // If the CAS succeeded then we're done and return "now".
1002 // If the CAS failed and the observed value "obsv" is >= now then
1003 // we should return "obsv". If the CAS failed and now > obsv > prv then
1004 // some other thread raced this thread and installed a new value, in which case
1005 // we could either (a) retry the entire operation, (b) retry trying to install now
1006 // or (c) just return obsv. We use (c). No loop is required although in some cases
1007 // we might discard a higher "now" value in deference to a slightly lower but freshly
1008 // installed obsv value. That's entirely benign -- it admits no new orderings compared
1009 // to (a) or (b) -- and greatly reduces coherence traffic.
1010 // We might also condition (c) on the magnitude of the delta between obsv and now.
1011 // Avoiding excessive CAS operations to hot RW locations is critical.
1012 // See https://blogs.oracle.com/dave/entry/cas_and_cache_trivia_invalidate
1013 return (prev == obsv) ? now : obsv;
1014 }
1015
1016 #else // __APPLE__
1017
javaTimeNanos()1018 jlong os::javaTimeNanos() {
1019 if (os::supports_monotonic_clock()) {
1020 struct timespec tp;
1021 int status = Bsd::_clock_gettime(CLOCK_MONOTONIC, &tp);
1022 assert(status == 0, "gettime error");
1023 jlong result = jlong(tp.tv_sec) * (1000 * 1000 * 1000) + jlong(tp.tv_nsec);
1024 return result;
1025 } else {
1026 timeval time;
1027 int status = gettimeofday(&time, NULL);
1028 assert(status != -1, "bsd error");
1029 jlong usecs = jlong(time.tv_sec) * (1000 * 1000) + jlong(time.tv_usec);
1030 return 1000 * usecs;
1031 }
1032 }
1033
1034 #endif // __APPLE__
1035
javaTimeNanos_info(jvmtiTimerInfo * info_ptr)1036 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
1037 if (os::supports_monotonic_clock()) {
1038 info_ptr->max_value = ALL_64_BITS;
1039
1040 // CLOCK_MONOTONIC - amount of time since some arbitrary point in the past
1041 info_ptr->may_skip_backward = false; // not subject to resetting or drifting
1042 info_ptr->may_skip_forward = false; // not subject to resetting or drifting
1043 } else {
1044 // gettimeofday - based on time in seconds since the Epoch thus does not wrap
1045 info_ptr->max_value = ALL_64_BITS;
1046
1047 // gettimeofday is a real time clock so it skips
1048 info_ptr->may_skip_backward = true;
1049 info_ptr->may_skip_forward = true;
1050 }
1051
1052 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
1053 }
1054
1055 // Return the real, user, and system times in seconds from an
1056 // arbitrary fixed point in the past.
getTimesSecs(double * process_real_time,double * process_user_time,double * process_system_time)1057 bool os::getTimesSecs(double* process_real_time,
1058 double* process_user_time,
1059 double* process_system_time) {
1060 struct tms ticks;
1061 clock_t real_ticks = times(&ticks);
1062
1063 if (real_ticks == (clock_t) (-1)) {
1064 return false;
1065 } else {
1066 double ticks_per_second = (double) clock_tics_per_sec;
1067 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second;
1068 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second;
1069 *process_real_time = ((double) real_ticks) / ticks_per_second;
1070
1071 return true;
1072 }
1073 }
1074
1075
local_time_string(char * buf,size_t buflen)1076 char * os::local_time_string(char *buf, size_t buflen) {
1077 struct tm t;
1078 time_t long_time;
1079 time(&long_time);
1080 localtime_r(&long_time, &t);
1081 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
1082 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday,
1083 t.tm_hour, t.tm_min, t.tm_sec);
1084 return buf;
1085 }
1086
localtime_pd(const time_t * clock,struct tm * res)1087 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
1088 return localtime_r(clock, res);
1089 }
1090
1091 ////////////////////////////////////////////////////////////////////////////////
1092 // runtime exit support
1093
1094 // Note: os::shutdown() might be called very early during initialization, or
1095 // called from signal handler. Before adding something to os::shutdown(), make
1096 // sure it is async-safe and can handle partially initialized VM.
shutdown()1097 void os::shutdown() {
1098
1099 // allow PerfMemory to attempt cleanup of any persistent resources
1100 perfMemory_exit();
1101
1102 // needs to remove object in file system
1103 AttachListener::abort();
1104
1105 // flush buffered output, finish log files
1106 ostream_abort();
1107
1108 // Check for abort hook
1109 abort_hook_t abort_hook = Arguments::abort_hook();
1110 if (abort_hook != NULL) {
1111 abort_hook();
1112 }
1113
1114 }
1115
1116 // Note: os::abort() might be called very early during initialization, or
1117 // called from signal handler. Before adding something to os::abort(), make
1118 // sure it is async-safe and can handle partially initialized VM.
abort(bool dump_core,void * siginfo,const void * context)1119 void os::abort(bool dump_core, void* siginfo, const void* context) {
1120 os::shutdown();
1121 if (dump_core) {
1122 #ifndef PRODUCT
1123 fdStream out(defaultStream::output_fd());
1124 out.print_raw("Current thread is ");
1125 char buf[16];
1126 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id());
1127 out.print_raw_cr(buf);
1128 out.print_raw_cr("Dumping core ...");
1129 #endif
1130 ::abort(); // dump core
1131 }
1132
1133 ::exit(1);
1134 }
1135
1136 // Die immediately, no exit hook, no abort hook, no cleanup.
die()1137 void os::die() {
1138 // _exit() on BsdThreads only kills current thread
1139 ::abort();
1140 }
1141
1142 // Information of current thread in variety of formats
gettid()1143 pid_t os::Bsd::gettid() {
1144 int retval = -1;
1145
1146 #ifdef __APPLE__ //XNU kernel
1147 // despite the fact mach port is actually not a thread id use it
1148 // instead of syscall(SYS_thread_selfid) as it certainly fits to u4
1149 retval = ::pthread_mach_thread_np(::pthread_self());
1150 guarantee(retval != 0, "just checking");
1151 return retval;
1152
1153 #elif defined(__FreeBSD__) || defined(__DragonFly__)
1154 return ::pthread_getthreadid_np();
1155 #elif defined(__OpenBSD__)
1156 retval = getthrid();
1157 #elif defined(__NetBSD__)
1158 retval = (pid_t) _lwp_self();
1159 #endif
1160
1161 if (retval == -1) {
1162 return getpid();
1163 }
1164 return retval;
1165 }
1166
current_thread_id()1167 intx os::current_thread_id() {
1168 #ifdef __APPLE__
1169 return (intx)::pthread_mach_thread_np(::pthread_self());
1170 #elif defined(__FreeBSD__)
1171 return os::Bsd::gettid();
1172 #else
1173 return (intx)::pthread_self();
1174 #endif
1175 }
1176
current_process_id()1177 int os::current_process_id() {
1178
1179 // Under the old bsd thread library, bsd gives each thread
1180 // its own process id. Because of this each thread will return
1181 // a different pid if this method were to return the result
1182 // of getpid(2). Bsd provides no api that returns the pid
1183 // of the launcher thread for the vm. This implementation
1184 // returns a unique pid, the pid of the launcher thread
1185 // that starts the vm 'process'.
1186
1187 // Under the NPTL, getpid() returns the same pid as the
1188 // launcher thread rather than a unique pid per thread.
1189 // Use gettid() if you want the old pre NPTL behaviour.
1190
1191 // if you are looking for the result of a call to getpid() that
1192 // returns a unique pid for the calling thread, then look at the
1193 // OSThread::thread_id() method in osThread_bsd.hpp file
1194
1195 return (int)(_initial_pid ? _initial_pid : getpid());
1196 }
1197
1198 // DLL functions
1199
dll_file_extension()1200 const char* os::dll_file_extension() { return JNI_LIB_SUFFIX; }
1201
1202 // This must be hard coded because it's the system's temporary
1203 // directory not the java application's temp directory, ala java.io.tmpdir.
1204 #ifdef __APPLE__
1205 // macosx has a secure per-user temporary directory
1206 char temp_path_storage[PATH_MAX];
get_temp_directory()1207 const char* os::get_temp_directory() {
1208 static char *temp_path = NULL;
1209 if (temp_path == NULL) {
1210 int pathSize = confstr(_CS_DARWIN_USER_TEMP_DIR, temp_path_storage, PATH_MAX);
1211 if (pathSize == 0 || pathSize > PATH_MAX) {
1212 strlcpy(temp_path_storage, "/tmp/", sizeof(temp_path_storage));
1213 }
1214 temp_path = temp_path_storage;
1215 }
1216 return temp_path;
1217 }
1218 #else // __APPLE__
get_temp_directory()1219 const char* os::get_temp_directory() { return "/tmp"; }
1220 #endif // __APPLE__
1221
1222 // check if addr is inside libjvm.so
address_is_in_vm(address addr)1223 bool os::address_is_in_vm(address addr) {
1224 static address libjvm_base_addr;
1225 Dl_info dlinfo;
1226
1227 if (libjvm_base_addr == NULL) {
1228 if (dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo) != 0) {
1229 libjvm_base_addr = (address)dlinfo.dli_fbase;
1230 }
1231 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm");
1232 }
1233
1234 if (dladdr((void *)addr, &dlinfo) != 0) {
1235 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true;
1236 }
1237
1238 return false;
1239 }
1240
1241
1242 #define MACH_MAXSYMLEN 256
1243
dll_address_to_function_name(address addr,char * buf,int buflen,int * offset,bool demangle)1244 bool os::dll_address_to_function_name(address addr, char *buf,
1245 int buflen, int *offset,
1246 bool demangle) {
1247 // buf is not optional, but offset is optional
1248 assert(buf != NULL, "sanity check");
1249
1250 Dl_info dlinfo;
1251 char localbuf[MACH_MAXSYMLEN];
1252
1253 if (dladdr((void*)addr, &dlinfo) != 0) {
1254 // see if we have a matching symbol
1255 if (dlinfo.dli_saddr != NULL && dlinfo.dli_sname != NULL) {
1256 if (!(demangle && Decoder::demangle(dlinfo.dli_sname, buf, buflen))) {
1257 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname);
1258 }
1259 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr;
1260 return true;
1261 }
1262 // no matching symbol so try for just file info
1263 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) {
1264 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase),
1265 buf, buflen, offset, dlinfo.dli_fname, demangle)) {
1266 return true;
1267 }
1268 }
1269
1270 // Handle non-dynamic manually:
1271 if (dlinfo.dli_fbase != NULL &&
1272 Decoder::decode(addr, localbuf, MACH_MAXSYMLEN, offset,
1273 dlinfo.dli_fbase)) {
1274 if (!(demangle && Decoder::demangle(localbuf, buf, buflen))) {
1275 jio_snprintf(buf, buflen, "%s", localbuf);
1276 }
1277 return true;
1278 }
1279 }
1280 buf[0] = '\0';
1281 if (offset != NULL) *offset = -1;
1282 return false;
1283 }
1284
1285 // ported from solaris version
dll_address_to_library_name(address addr,char * buf,int buflen,int * offset)1286 bool os::dll_address_to_library_name(address addr, char* buf,
1287 int buflen, int* offset) {
1288 // buf is not optional, but offset is optional
1289 assert(buf != NULL, "sanity check");
1290
1291 Dl_info dlinfo;
1292
1293 if (dladdr((void*)addr, &dlinfo) != 0) {
1294 if (dlinfo.dli_fname != NULL) {
1295 jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname);
1296 }
1297 if (dlinfo.dli_fbase != NULL && offset != NULL) {
1298 *offset = addr - (address)dlinfo.dli_fbase;
1299 }
1300 return true;
1301 }
1302
1303 buf[0] = '\0';
1304 if (offset) *offset = -1;
1305 return false;
1306 }
1307
1308 // Loads .dll/.so and
1309 // in case of error it checks if .dll/.so was built for the
1310 // same architecture as Hotspot is running on
1311
1312 #ifdef __APPLE__
dll_load(const char * filename,char * ebuf,int ebuflen)1313 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) {
1314 #ifdef STATIC_BUILD
1315 return os::get_default_process_handle();
1316 #else
1317 void * result= ::dlopen(filename, RTLD_LAZY);
1318 if (result != NULL) {
1319 // Successful loading
1320 return result;
1321 }
1322
1323 // Read system error message into ebuf
1324 ::strncpy(ebuf, ::dlerror(), ebuflen-1);
1325 ebuf[ebuflen-1]='\0';
1326
1327 return NULL;
1328 #endif // STATIC_BUILD
1329 }
1330 #else
dll_load(const char * filename,char * ebuf,int ebuflen)1331 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) {
1332 #ifdef STATIC_BUILD
1333 return os::get_default_process_handle();
1334 #else
1335 void * result= ::dlopen(filename, RTLD_LAZY);
1336 if (result != NULL) {
1337 // Successful loading
1338 return result;
1339 }
1340
1341 Elf32_Ehdr elf_head;
1342
1343 // Read system error message into ebuf
1344 // It may or may not be overwritten below
1345 ::strncpy(ebuf, ::dlerror(), ebuflen-1);
1346 ebuf[ebuflen-1]='\0';
1347 int diag_msg_max_length=ebuflen-strlen(ebuf);
1348 char* diag_msg_buf=ebuf+strlen(ebuf);
1349
1350 if (diag_msg_max_length==0) {
1351 // No more space in ebuf for additional diagnostics message
1352 return NULL;
1353 }
1354
1355
1356 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK);
1357
1358 if (file_descriptor < 0) {
1359 // Can't open library, report dlerror() message
1360 return NULL;
1361 }
1362
1363 bool failed_to_read_elf_head=
1364 (sizeof(elf_head)!=
1365 (::read(file_descriptor, &elf_head,sizeof(elf_head))));
1366
1367 ::close(file_descriptor);
1368 if (failed_to_read_elf_head) {
1369 // file i/o error - report dlerror() msg
1370 return NULL;
1371 }
1372
1373 typedef struct {
1374 Elf32_Half code; // Actual value as defined in elf.h
1375 Elf32_Half compat_class; // Compatibility of archs at VM's sense
1376 char elf_class; // 32 or 64 bit
1377 char endianess; // MSB or LSB
1378 char* name; // String representation
1379 } arch_t;
1380
1381 #ifndef EM_486
1382 #define EM_486 6 /* Intel 80486 */
1383 #endif
1384
1385 #ifndef EM_MIPS_RS3_LE
1386 #define EM_MIPS_RS3_LE 10 /* MIPS */
1387 #endif
1388
1389 #ifndef EM_PPC64
1390 #define EM_PPC64 21 /* PowerPC64 */
1391 #endif
1392
1393 #ifndef EM_S390
1394 #define EM_S390 22 /* IBM System/390 */
1395 #endif
1396
1397 #ifndef EM_IA_64
1398 #define EM_IA_64 50 /* HP/Intel IA-64 */
1399 #endif
1400
1401 #ifndef EM_X86_64
1402 #define EM_X86_64 62 /* AMD x86-64 */
1403 #endif
1404
1405 #ifndef EM_AARCH64
1406 #define EM_AARCH64 183 /* ARM AARCH64 */
1407 #endif
1408
1409 static const arch_t arch_array[]={
1410 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
1411 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
1412 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"},
1413 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"},
1414 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
1415 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
1416 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"},
1417 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"},
1418 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"},
1419 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM"},
1420 {EM_AARCH64, EM_AARCH64, ELFCLASS64, ELFDATA2LSB, (char*)"AARCH64"},
1421 {EM_S390, EM_S390, ELFCLASSNONE, ELFDATA2MSB, (char*)"IBM System/390"},
1422 {EM_ALPHA, EM_ALPHA, ELFCLASS64, ELFDATA2LSB, (char*)"Alpha"},
1423 {EM_MIPS_RS3_LE, EM_MIPS_RS3_LE, ELFCLASS32, ELFDATA2LSB, (char*)"MIPSel"},
1424 {EM_MIPS, EM_MIPS, ELFCLASS32, ELFDATA2MSB, (char*)"MIPS"},
1425 {EM_PARISC, EM_PARISC, ELFCLASS32, ELFDATA2MSB, (char*)"PARISC"},
1426 {EM_68K, EM_68K, ELFCLASS32, ELFDATA2MSB, (char*)"M68k"}
1427 };
1428
1429 #if (defined IA32)
1430 static Elf32_Half running_arch_code=EM_386;
1431 #elif (defined AMD64)
1432 static Elf32_Half running_arch_code=EM_X86_64;
1433 #elif (defined IA64)
1434 static Elf32_Half running_arch_code=EM_IA_64;
1435 #elif (defined __sparc) && (defined _LP64)
1436 static Elf32_Half running_arch_code=EM_SPARCV9;
1437 #elif (defined __sparc) && (!defined _LP64)
1438 static Elf32_Half running_arch_code=EM_SPARC;
1439 #elif (defined __powerpc64__)
1440 static Elf32_Half running_arch_code=EM_PPC64;
1441 #elif (defined __powerpc__)
1442 static Elf32_Half running_arch_code=EM_PPC;
1443 #elif (defined AARCH64)
1444 static Elf32_Half running_arch_code=EM_AARCH64;
1445 #elif (defined ARM)
1446 static Elf32_Half running_arch_code=EM_ARM;
1447 #elif (defined S390)
1448 static Elf32_Half running_arch_code=EM_S390;
1449 #elif (defined ALPHA)
1450 static Elf32_Half running_arch_code=EM_ALPHA;
1451 #elif (defined MIPSEL)
1452 static Elf32_Half running_arch_code=EM_MIPS_RS3_LE;
1453 #elif (defined PARISC)
1454 static Elf32_Half running_arch_code=EM_PARISC;
1455 #elif (defined MIPS)
1456 static Elf32_Half running_arch_code=EM_MIPS;
1457 #elif (defined M68K)
1458 static Elf32_Half running_arch_code=EM_68K;
1459 #else
1460 #error Method os::dll_load requires that one of following is defined:\
1461 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, AARCH64, S390, ALPHA, MIPS, MIPSEL, PARISC, M68K
1462 #endif
1463
1464 // Identify compatability class for VM's architecture and library's architecture
1465 // Obtain string descriptions for architectures
1466
1467 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL};
1468 int running_arch_index=-1;
1469
1470 for (unsigned int i=0; i < ARRAY_SIZE(arch_array); i++) {
1471 if (running_arch_code == arch_array[i].code) {
1472 running_arch_index = i;
1473 }
1474 if (lib_arch.code == arch_array[i].code) {
1475 lib_arch.compat_class = arch_array[i].compat_class;
1476 lib_arch.name = arch_array[i].name;
1477 }
1478 }
1479
1480 assert(running_arch_index != -1,
1481 "Didn't find running architecture code (running_arch_code) in arch_array");
1482 if (running_arch_index == -1) {
1483 // Even though running architecture detection failed
1484 // we may still continue with reporting dlerror() message
1485 return NULL;
1486 }
1487
1488 if (lib_arch.endianess != arch_array[running_arch_index].endianess) {
1489 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)");
1490 return NULL;
1491 }
1492
1493 #ifndef S390
1494 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) {
1495 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)");
1496 return NULL;
1497 }
1498 #endif // !S390
1499
1500 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) {
1501 if (lib_arch.name!=NULL) {
1502 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
1503 " (Possible cause: can't load %s-bit .so on a %s-bit platform)",
1504 lib_arch.name, arch_array[running_arch_index].name);
1505 } else {
1506 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
1507 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)",
1508 lib_arch.code,
1509 arch_array[running_arch_index].name);
1510 }
1511 }
1512
1513 return NULL;
1514 #endif // STATIC_BUILD
1515 }
1516 #endif // !__APPLE__
1517
get_default_process_handle()1518 void* os::get_default_process_handle() {
1519 #ifdef __APPLE__
1520 // MacOS X needs to use RTLD_FIRST instead of RTLD_LAZY
1521 // to avoid finding unexpected symbols on second (or later)
1522 // loads of a library.
1523 return (void*)::dlopen(NULL, RTLD_FIRST);
1524 #else
1525 return (void*)::dlopen(NULL, RTLD_LAZY);
1526 #endif
1527 }
1528
1529 // XXX: Do we need a lock around this as per Linux?
dll_lookup(void * handle,const char * name)1530 void* os::dll_lookup(void* handle, const char* name) {
1531 return dlsym(handle, name);
1532 }
1533
_print_dll_info_cb(const char * name,address base_address,address top_address,void * param)1534 int _print_dll_info_cb(const char * name, address base_address, address top_address, void * param) {
1535 outputStream * out = (outputStream *) param;
1536 out->print_cr(INTPTR_FORMAT " \t%s", (intptr_t)base_address, name);
1537 return 0;
1538 }
1539
print_dll_info(outputStream * st)1540 void os::print_dll_info(outputStream *st) {
1541 st->print_cr("Dynamic libraries:");
1542 if (get_loaded_modules_info(_print_dll_info_cb, (void *)st)) {
1543 st->print_cr("Error: Cannot print dynamic libraries.");
1544 }
1545 }
1546
1547 #if defined(__OpenBSD__)
1548 struct iterate_data {
1549 os::LoadedModulesCallbackFunc callback;
1550 void *param;
1551 };
1552
iter_callback(struct dl_phdr_info * info,size_t size,void * d)1553 static int iter_callback(struct dl_phdr_info *info, size_t size, void* d) {
1554 struct iterate_data *data = (struct iterate_data *)d;
1555
1556 if(data->callback(info->dlpi_name, (address)info->dlpi_addr, (address)0, data->param))
1557 return 1;
1558
1559 return 0;
1560 }
1561 #endif
1562
get_loaded_modules_info(os::LoadedModulesCallbackFunc callback,void * param)1563 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) {
1564 #ifdef RTLD_DI_LINKMAP
1565 Dl_info dli;
1566 void *handle;
1567 Link_map *map;
1568 Link_map *p;
1569
1570 if (dladdr(CAST_FROM_FN_PTR(void *, os::print_dll_info), &dli) == 0 ||
1571 dli.dli_fname == NULL) {
1572 return 1;
1573 }
1574 handle = dlopen(dli.dli_fname, RTLD_LAZY);
1575 if (handle == NULL) {
1576 return 1;
1577 }
1578 dlinfo(handle, RTLD_DI_LINKMAP, &map);
1579 if (map == NULL) {
1580 dlclose(handle);
1581 return 1;
1582 }
1583
1584 while (map->l_prev != NULL)
1585 map = map->l_prev;
1586
1587 while (map != NULL) {
1588 // Value for top_address is returned as 0 since we don't have any information about module size
1589 if (callback(map->l_name, (address)map->l_addr, (address)0, param)) {
1590 dlclose(handle);
1591 return 1;
1592 }
1593 map = map->l_next;
1594 }
1595
1596 dlclose(handle);
1597 return 0;
1598 #elif defined(__APPLE__)
1599 for (uint32_t i = 1; i < _dyld_image_count(); i++) {
1600 // Value for top_address is returned as 0 since we don't have any information about module size
1601 if (callback(_dyld_get_image_name(i), (address)_dyld_get_image_header(i), (address)0, param)) {
1602 return 1;
1603 }
1604 }
1605 return 0;
1606 #elif defined(__OpenBSD__)
1607 struct iterate_data data = { callback, param };
1608
1609 return dl_iterate_phdr(iter_callback, &data);
1610 #else
1611 return 1;
1612 #endif
1613 }
1614
get_summary_os_info(char * buf,size_t buflen)1615 void os::get_summary_os_info(char* buf, size_t buflen) {
1616 // These buffers are small because we want this to be brief
1617 // and not use a lot of stack while generating the hs_err file.
1618 char os[100];
1619 size_t size = sizeof(os);
1620 int mib_kern[] = { CTL_KERN, KERN_OSTYPE };
1621 if (sysctl(mib_kern, 2, os, &size, NULL, 0) < 0) {
1622 #ifdef __APPLE__
1623 strncpy(os, "Darwin", sizeof(os));
1624 #elif defined(__OpenBSD__)
1625 strncpy(os, "OpenBSD", sizeof(os));
1626 #else
1627 strncpy(os, "BSD", sizeof(os));
1628 #endif
1629 }
1630
1631 char release[100];
1632 size = sizeof(release);
1633 int mib_release[] = { CTL_KERN, KERN_OSRELEASE };
1634 if (sysctl(mib_release, 2, release, &size, NULL, 0) < 0) {
1635 // if error, leave blank
1636 strncpy(release, "", sizeof(release));
1637 }
1638 snprintf(buf, buflen, "%s %s", os, release);
1639 }
1640
print_os_info_brief(outputStream * st)1641 void os::print_os_info_brief(outputStream* st) {
1642 os::Posix::print_uname_info(st);
1643 }
1644
print_os_info(outputStream * st)1645 void os::print_os_info(outputStream* st) {
1646 st->print("OS:");
1647
1648 os::Posix::print_uname_info(st);
1649
1650 os::Posix::print_rlimit_info(st);
1651
1652 os::Posix::print_load_average(st);
1653 }
1654
pd_print_cpu_info(outputStream * st,char * buf,size_t buflen)1655 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) {
1656 size_t size = buflen;
1657 int mib[] = { CTL_HW, HW_MODEL };
1658 if (sysctl(mib, 2, buf, &size, NULL, 0) == 0) {
1659 st->print("CPU Model: %s\n", buf);
1660 }
1661 }
1662
get_summary_cpu_info(char * buf,size_t buflen)1663 void os::get_summary_cpu_info(char* buf, size_t buflen) {
1664 size_t size;
1665 #ifdef __APPLE__
1666 unsigned int mhz;
1667 size = sizeof(mhz);
1668 int mib[] = { CTL_HW, HW_CPU_FREQ };
1669 if (sysctl(mib, 2, &mhz, &size, NULL, 0) < 0) {
1670 mhz = 1; // looks like an error but can be divided by
1671 } else {
1672 mhz /= 1000000; // reported in millions
1673 }
1674 #endif
1675
1676 char model[100];
1677 size = sizeof(model);
1678 int mib_model[] = { CTL_HW, HW_MODEL };
1679 if (sysctl(mib_model, 2, model, &size, NULL, 0) < 0) {
1680 strncpy(model, cpu_arch, sizeof(model));
1681 }
1682
1683 char machine[100];
1684 size = sizeof(machine);
1685 int mib_machine[] = { CTL_HW, HW_MACHINE };
1686 if (sysctl(mib_machine, 2, machine, &size, NULL, 0) < 0) {
1687 strncpy(machine, "", sizeof(machine));
1688 }
1689
1690 #ifdef __APPLE__
1691 snprintf(buf, buflen, "%s %s %d MHz", model, machine, mhz);
1692 #else
1693 snprintf(buf, buflen, "%s %s", model, machine);
1694 #endif
1695 }
1696
1697 #ifdef __FreeBSD__
get_swap_info(int * total_pages,int * used_pages)1698 static void get_swap_info(int *total_pages, int *used_pages) {
1699 struct xswdev xsw;
1700 size_t mibsize, size;
1701 int mib[16];
1702 int n, total = 0, used = 0;
1703
1704 mibsize = sizeof(mib) / sizeof(mib[0]);
1705 if (sysctlnametomib("vm.swap_info", mib, &mibsize) != -1) {
1706 for (n = 0; ; n++) {
1707 mib[mibsize] = n;
1708 size = sizeof(xsw);
1709 if (sysctl(mib, mibsize + 1, &xsw, &size, NULL, 0) == -1)
1710 break;
1711 total += xsw.xsw_nblks;
1712 used += xsw.xsw_used;
1713 }
1714 }
1715 *total_pages = total;
1716 *used_pages = used;
1717 }
1718 #endif
1719
print_memory_info(outputStream * st)1720 void os::print_memory_info(outputStream* st) {
1721
1722 st->print("Memory:");
1723 st->print(" %dk page", os::vm_page_size()>>10);
1724
1725 st->print(", physical " UINT64_FORMAT "k",
1726 os::physical_memory() >> 10);
1727 st->print("(" UINT64_FORMAT "k free)",
1728 os::available_memory() >> 10);
1729 #ifdef __FreeBSD__
1730 int total, used;
1731 get_swap_info(&total, &used);
1732 st->print(", swap " UINT64_FORMAT "k",
1733 (((uint64_t) total) * ((uint64_t) os::vm_page_size())) >> 10);
1734 st->print("(" UINT64_FORMAT "k free)",
1735 (((uint64_t) (total - used)) * ((uint64_t) os::vm_page_size())) >> 10);
1736 #endif
1737 st->cr();
1738 }
1739
1740 static void print_signal_handler(outputStream* st, int sig,
1741 char* buf, size_t buflen);
1742
print_signal_handlers(outputStream * st,char * buf,size_t buflen)1743 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1744 st->print_cr("Signal Handlers:");
1745 print_signal_handler(st, SIGSEGV, buf, buflen);
1746 print_signal_handler(st, SIGBUS , buf, buflen);
1747 print_signal_handler(st, SIGFPE , buf, buflen);
1748 print_signal_handler(st, SIGPIPE, buf, buflen);
1749 print_signal_handler(st, SIGXFSZ, buf, buflen);
1750 print_signal_handler(st, SIGILL , buf, buflen);
1751 print_signal_handler(st, SR_signum, buf, buflen);
1752 print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen);
1753 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen);
1754 print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen);
1755 print_signal_handler(st, BREAK_SIGNAL, buf, buflen);
1756 }
1757
1758 static char saved_jvm_path[MAXPATHLEN] = {0};
1759
1760 // Find the full path to the current module, libjvm
jvm_path(char * buf,jint buflen)1761 void os::jvm_path(char *buf, jint buflen) {
1762 // Error checking.
1763 if (buflen < MAXPATHLEN) {
1764 assert(false, "must use a large-enough buffer");
1765 buf[0] = '\0';
1766 return;
1767 }
1768 // Lazy resolve the path to current module.
1769 if (saved_jvm_path[0] != 0) {
1770 strcpy(buf, saved_jvm_path);
1771 return;
1772 }
1773
1774 char dli_fname[MAXPATHLEN];
1775 bool ret = dll_address_to_library_name(
1776 CAST_FROM_FN_PTR(address, os::jvm_path),
1777 dli_fname, sizeof(dli_fname), NULL);
1778 assert(ret, "cannot locate libjvm");
1779 char *rp = NULL;
1780 if (ret && dli_fname[0] != '\0') {
1781 rp = os::Posix::realpath(dli_fname, buf, buflen);
1782 }
1783 if (rp == NULL) {
1784 return;
1785 }
1786
1787 if (Arguments::sun_java_launcher_is_altjvm()) {
1788 // Support for the java launcher's '-XXaltjvm=<path>' option. Typical
1789 // value for buf is "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so"
1790 // or "<JAVA_HOME>/jre/lib/<vmtype>/libjvm.dylib". If "/jre/lib/"
1791 // appears at the right place in the string, then assume we are
1792 // installed in a JDK and we're done. Otherwise, check for a
1793 // JAVA_HOME environment variable and construct a path to the JVM
1794 // being overridden.
1795
1796 const char *p = buf + strlen(buf) - 1;
1797 for (int count = 0; p > buf && count < 5; ++count) {
1798 for (--p; p > buf && *p != '/'; --p)
1799 /* empty */ ;
1800 }
1801
1802 if (strncmp(p, "/jre/lib/", 9) != 0) {
1803 // Look for JAVA_HOME in the environment.
1804 char* java_home_var = ::getenv("JAVA_HOME");
1805 if (java_home_var != NULL && java_home_var[0] != 0) {
1806 char* jrelib_p;
1807 int len;
1808
1809 // Check the current module name "libjvm"
1810 p = strrchr(buf, '/');
1811 assert(strstr(p, "/libjvm") == p, "invalid library name");
1812
1813 rp = os::Posix::realpath(java_home_var, buf, buflen);
1814 if (rp == NULL) {
1815 return;
1816 }
1817
1818 // determine if this is a legacy image or modules image
1819 // modules image doesn't have "jre" subdirectory
1820 len = strlen(buf);
1821 assert(len < buflen, "Ran out of buffer space");
1822 jrelib_p = buf + len;
1823
1824 // Add the appropriate library subdir
1825 snprintf(jrelib_p, buflen-len, "/jre/lib");
1826 if (0 != access(buf, F_OK)) {
1827 snprintf(jrelib_p, buflen-len, "/lib");
1828 }
1829
1830 // Add the appropriate client or server subdir
1831 len = strlen(buf);
1832 jrelib_p = buf + len;
1833 snprintf(jrelib_p, buflen-len, "/%s", COMPILER_VARIANT);
1834 if (0 != access(buf, F_OK)) {
1835 snprintf(jrelib_p, buflen-len, "%s", "");
1836 }
1837
1838 // If the path exists within JAVA_HOME, add the JVM library name
1839 // to complete the path to JVM being overridden. Otherwise fallback
1840 // to the path to the current library.
1841 if (0 == access(buf, F_OK)) {
1842 // Use current module name "libjvm"
1843 len = strlen(buf);
1844 snprintf(buf + len, buflen-len, "/libjvm%s", JNI_LIB_SUFFIX);
1845 } else {
1846 // Fall back to path of current library
1847 rp = os::Posix::realpath(dli_fname, buf, buflen);
1848 if (rp == NULL) {
1849 return;
1850 }
1851 }
1852 }
1853 }
1854 }
1855
1856 strncpy(saved_jvm_path, buf, MAXPATHLEN);
1857 saved_jvm_path[MAXPATHLEN - 1] = '\0';
1858 }
1859
print_jni_name_prefix_on(outputStream * st,int args_size)1860 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1861 // no prefix required, not even "_"
1862 }
1863
print_jni_name_suffix_on(outputStream * st,int args_size)1864 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1865 // no suffix required
1866 }
1867
1868 ////////////////////////////////////////////////////////////////////////////////
1869 // sun.misc.Signal support
1870
1871 static volatile jint sigint_count = 0;
1872
UserHandler(int sig,void * siginfo,void * context)1873 static void UserHandler(int sig, void *siginfo, void *context) {
1874 // 4511530 - sem_post is serialized and handled by the manager thread. When
1875 // the program is interrupted by Ctrl-C, SIGINT is sent to every thread. We
1876 // don't want to flood the manager thread with sem_post requests.
1877 if (sig == SIGINT && Atomic::add(1, &sigint_count) > 1) {
1878 return;
1879 }
1880
1881 // Ctrl-C is pressed during error reporting, likely because the error
1882 // handler fails to abort. Let VM die immediately.
1883 if (sig == SIGINT && VMError::is_error_reported()) {
1884 os::die();
1885 }
1886
1887 os::signal_notify(sig);
1888 }
1889
user_handler()1890 void* os::user_handler() {
1891 return CAST_FROM_FN_PTR(void*, UserHandler);
1892 }
1893
1894 #ifdef __APPLE__
1895 #define create_semaphore_timespec(sec, nsec) sec, nsec
1896 #else
1897 #define MAX_SECS 100000000
1898
1899 // This code is common to linux and solaris and will be moved to a
1900 // common place in dolphin.
1901 //
1902 // The passed in time value is either a relative time in nanoseconds
1903 // or an absolute time in milliseconds. Either way it has to be unpacked
1904 // into suitable seconds and nanoseconds components and stored in the
1905 // given timespec structure.
1906 // Given time is a 64-bit value and the time_t used in the timespec is only
1907 // a signed-32-bit value (except on 64-bit Linux) we have to watch for
1908 // overflow if times way in the future are given. Further on Solaris versions
1909 // prior to 10 there is a restriction (see cond_timedwait) that the specified
1910 // number of seconds, in abstime, is less than current_time + 100,000,000.
1911 // As it will be 28 years before "now + 100000000" will overflow we can
1912 // ignore overflow and just impose a hard-limit on seconds using the value
1913 // of "now + 100,000,000". This places a limit on the timeout of about 3.17
1914 // years from "now".
1915 //
unpackTime(timespec * absTime,bool isAbsolute,jlong time)1916 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time) {
1917 assert(time > 0, "convertTime");
1918
1919 struct timeval now;
1920 int status = gettimeofday(&now, NULL);
1921 assert(status == 0, "gettimeofday");
1922
1923 time_t max_secs = now.tv_sec + MAX_SECS;
1924
1925 if (isAbsolute) {
1926 jlong secs = time / 1000;
1927 if (secs > max_secs) {
1928 absTime->tv_sec = max_secs;
1929 } else {
1930 absTime->tv_sec = secs;
1931 }
1932 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC;
1933 } else {
1934 jlong secs = time / NANOSECS_PER_SEC;
1935 if (secs >= MAX_SECS) {
1936 absTime->tv_sec = max_secs;
1937 absTime->tv_nsec = 0;
1938 } else {
1939 absTime->tv_sec = now.tv_sec + secs;
1940 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000;
1941 if (absTime->tv_nsec >= NANOSECS_PER_SEC) {
1942 absTime->tv_nsec -= NANOSECS_PER_SEC;
1943 ++absTime->tv_sec; // note: this must be <= max_secs
1944 }
1945 }
1946 }
1947 assert(absTime->tv_sec >= 0, "tv_sec < 0");
1948 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs");
1949 assert(absTime->tv_nsec >= 0, "tv_nsec < 0");
1950 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec");
1951 }
1952
create_semaphore_timespec(unsigned int sec,int nsec)1953 static struct timespec create_semaphore_timespec(unsigned int sec, int nsec) {
1954 struct timespec ts;
1955
1956 if (os::supports_monotonic_clock()) {
1957 ::clock_gettime(CLOCK_REALTIME, &ts);
1958 // see os_posix.cpp for discussion on overflow checking
1959 if (sec >= MAX_SECS) {
1960 ts.tv_sec += MAX_SECS;
1961 ts.tv_nsec = 0;
1962 } else {
1963 ts.tv_sec += sec;
1964 ts.tv_nsec += nsec;
1965 if (ts.tv_nsec >= NANOSECS_PER_SEC) {
1966 ts.tv_nsec -= NANOSECS_PER_SEC;
1967 ++ts.tv_sec; // note: this must be <= max_secs
1968 }
1969 }
1970 } else {
1971 unpackTime(&ts, false, (sec * NANOSECS_PER_SEC) + nsec);
1972 }
1973 return ts;
1974 }
1975 #endif
1976
1977 extern "C" {
1978 typedef void (*sa_handler_t)(int);
1979 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *);
1980 }
1981
signal(int signal_number,void * handler)1982 void* os::signal(int signal_number, void* handler) {
1983 struct sigaction sigAct, oldSigAct;
1984
1985 sigfillset(&(sigAct.sa_mask));
1986 sigAct.sa_flags = SA_RESTART|SA_SIGINFO;
1987 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler);
1988
1989 if (sigaction(signal_number, &sigAct, &oldSigAct)) {
1990 // -1 means registration failed
1991 return (void *)-1;
1992 }
1993
1994 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler);
1995 }
1996
signal_raise(int signal_number)1997 void os::signal_raise(int signal_number) {
1998 ::raise(signal_number);
1999 }
2000
2001 // The following code is moved from os.cpp for making this
2002 // code platform specific, which it is by its very nature.
2003
2004 // Will be modified when max signal is changed to be dynamic
sigexitnum_pd()2005 int os::sigexitnum_pd() {
2006 return NSIG;
2007 }
2008
2009 // a counter for each possible signal value
2010 static volatile jint pending_signals[NSIG+1] = { 0 };
2011 static Semaphore* sig_sem = NULL;
2012
jdk_misc_signal_init()2013 static void jdk_misc_signal_init() {
2014 // Initialize signal structures
2015 ::memset((void*)pending_signals, 0, sizeof(pending_signals));
2016
2017 // Initialize signal semaphore
2018 sig_sem = new Semaphore();
2019 }
2020
signal_notify(int sig)2021 void os::signal_notify(int sig) {
2022 if (sig_sem != NULL) {
2023 Atomic::inc(&pending_signals[sig]);
2024 sig_sem->signal();
2025 } else {
2026 // Signal thread is not created with ReduceSignalUsage and jdk_misc_signal_init
2027 // initialization isn't called.
2028 assert(ReduceSignalUsage, "signal semaphore should be created");
2029 }
2030 }
2031
check_pending_signals()2032 static int check_pending_signals() {
2033 Atomic::store(0, &sigint_count);
2034 for (;;) {
2035 for (int i = 0; i < NSIG + 1; i++) {
2036 jint n = pending_signals[i];
2037 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
2038 return i;
2039 }
2040 }
2041 JavaThread *thread = JavaThread::current();
2042 ThreadBlockInVM tbivm(thread);
2043
2044 bool threadIsSuspended;
2045 do {
2046 thread->set_suspend_equivalent();
2047 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
2048 sig_sem->wait();
2049
2050 // were we externally suspended while we were waiting?
2051 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
2052 if (threadIsSuspended) {
2053 // The semaphore has been incremented, but while we were waiting
2054 // another thread suspended us. We don't want to continue running
2055 // while suspended because that would surprise the thread that
2056 // suspended us.
2057 sig_sem->signal();
2058
2059 thread->java_suspend_self();
2060 }
2061 } while (threadIsSuspended);
2062 }
2063 }
2064
signal_wait()2065 int os::signal_wait() {
2066 return check_pending_signals();
2067 }
2068
2069 ////////////////////////////////////////////////////////////////////////////////
2070 // Virtual Memory
2071
vm_page_size()2072 int os::vm_page_size() {
2073 // Seems redundant as all get out
2074 assert(os::Bsd::page_size() != -1, "must call os::init");
2075 return os::Bsd::page_size();
2076 }
2077
2078 // Solaris allocates memory by pages.
vm_allocation_granularity()2079 int os::vm_allocation_granularity() {
2080 assert(os::Bsd::page_size() != -1, "must call os::init");
2081 return os::Bsd::page_size();
2082 }
2083
2084 // Rationale behind this function:
2085 // current (Mon Apr 25 20:12:18 MSD 2005) oprofile drops samples without executable
2086 // mapping for address (see lookup_dcookie() in the kernel module), thus we cannot get
2087 // samples for JITted code. Here we create private executable mapping over the code cache
2088 // and then we can use standard (well, almost, as mapping can change) way to provide
2089 // info for the reporting script by storing timestamp and location of symbol
bsd_wrap_code(char * base,size_t size)2090 void bsd_wrap_code(char* base, size_t size) {
2091 static volatile jint cnt = 0;
2092
2093 if (!UseOprofile) {
2094 return;
2095 }
2096
2097 char buf[PATH_MAX + 1];
2098 int num = Atomic::add(1, &cnt);
2099
2100 snprintf(buf, PATH_MAX + 1, "%s/hs-vm-%d-%d",
2101 os::get_temp_directory(), os::current_process_id(), num);
2102 unlink(buf);
2103
2104 int fd = ::open(buf, O_CREAT | O_RDWR, S_IRWXU);
2105
2106 if (fd != -1) {
2107 off_t rv = ::lseek(fd, size-2, SEEK_SET);
2108 if (rv != (off_t)-1) {
2109 if (::write(fd, "", 1) == 1) {
2110 mmap(base, size,
2111 PROT_READ|PROT_WRITE|PROT_EXEC,
2112 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE, fd, 0);
2113 }
2114 }
2115 ::close(fd);
2116 unlink(buf);
2117 }
2118 }
2119
warn_fail_commit_memory(char * addr,size_t size,bool exec,int err)2120 static void warn_fail_commit_memory(char* addr, size_t size, bool exec,
2121 int err) {
2122 warning("INFO: os::commit_memory(" INTPTR_FORMAT ", " SIZE_FORMAT
2123 ", %d) failed; error='%s' (errno=%d)", (intptr_t)addr, size, exec,
2124 os::errno_name(err), err);
2125 }
2126
2127 // NOTE: Bsd kernel does not really reserve the pages for us.
2128 // All it does is to check if there are enough free pages
2129 // left at the time of mmap(). This could be a potential
2130 // problem.
pd_commit_memory(char * addr,size_t size,bool exec)2131 bool os::pd_commit_memory(char* addr, size_t size, bool exec) {
2132 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE;
2133 uintptr_t res = (uintptr_t) ::mmap(addr, size, prot,
2134 MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0);
2135 if (res != (uintptr_t) MAP_FAILED) {
2136 return true;
2137 }
2138
2139 // Warn about any commit errors we see in non-product builds just
2140 // in case mmap() doesn't work as described on the man page.
2141 NOT_PRODUCT(warn_fail_commit_memory(addr, size, exec, errno);)
2142
2143 return false;
2144 }
2145
pd_commit_memory(char * addr,size_t size,size_t alignment_hint,bool exec)2146 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint,
2147 bool exec) {
2148 // alignment_hint is ignored on this OS
2149 return pd_commit_memory(addr, size, exec);
2150 }
2151
pd_commit_memory_or_exit(char * addr,size_t size,bool exec,const char * mesg)2152 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec,
2153 const char* mesg) {
2154 assert(mesg != NULL, "mesg must be specified");
2155 if (!pd_commit_memory(addr, size, exec)) {
2156 // add extra info in product mode for vm_exit_out_of_memory():
2157 PRODUCT_ONLY(warn_fail_commit_memory(addr, size, exec, errno);)
2158 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, "%s", mesg);
2159 }
2160 }
2161
pd_commit_memory_or_exit(char * addr,size_t size,size_t alignment_hint,bool exec,const char * mesg)2162 void os::pd_commit_memory_or_exit(char* addr, size_t size,
2163 size_t alignment_hint, bool exec,
2164 const char* mesg) {
2165 // alignment_hint is ignored on this OS
2166 pd_commit_memory_or_exit(addr, size, exec, mesg);
2167 }
2168
pd_realign_memory(char * addr,size_t bytes,size_t alignment_hint)2169 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) {
2170 }
2171
pd_free_memory(char * addr,size_t bytes,size_t alignment_hint)2172 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) {
2173 ::madvise(addr, bytes, MADV_DONTNEED);
2174 }
2175
numa_make_global(char * addr,size_t bytes)2176 void os::numa_make_global(char *addr, size_t bytes) {
2177 }
2178
numa_make_local(char * addr,size_t bytes,int lgrp_hint)2179 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) {
2180 }
2181
numa_topology_changed()2182 bool os::numa_topology_changed() { return false; }
2183
numa_get_groups_num()2184 size_t os::numa_get_groups_num() {
2185 return 1;
2186 }
2187
numa_get_group_id()2188 int os::numa_get_group_id() {
2189 return 0;
2190 }
2191
numa_get_leaf_groups(int * ids,size_t size)2192 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
2193 if (size > 0) {
2194 ids[0] = 0;
2195 return 1;
2196 }
2197 return 0;
2198 }
2199
get_page_info(char * start,page_info * info)2200 bool os::get_page_info(char *start, page_info* info) {
2201 return false;
2202 }
2203
scan_pages(char * start,char * end,page_info * page_expected,page_info * page_found)2204 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) {
2205 return end;
2206 }
2207
2208
pd_uncommit_memory(char * addr,size_t size)2209 bool os::pd_uncommit_memory(char* addr, size_t size) {
2210 uintptr_t res = (uintptr_t) ::mmap(addr, size, PROT_NONE,
2211 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE|MAP_ANONYMOUS, -1, 0);
2212 return res != (uintptr_t) MAP_FAILED;
2213 }
2214
pd_create_stack_guard_pages(char * addr,size_t size)2215 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
2216 return os::commit_memory(addr, size, !ExecMem);
2217 }
2218
2219 // If this is a growable mapping, remove the guard pages entirely by
2220 // munmap()ping them. If not, just call uncommit_memory().
remove_stack_guard_pages(char * addr,size_t size)2221 bool os::remove_stack_guard_pages(char* addr, size_t size) {
2222 return os::uncommit_memory(addr, size);
2223 }
2224
2225 // If 'fixed' is true, anon_mmap() will attempt to reserve anonymous memory
2226 // at 'requested_addr'. If there are existing memory mappings at the same
2227 // location, however, they will be overwritten. If 'fixed' is false,
2228 // 'requested_addr' is only treated as a hint, the return value may or
2229 // may not start from the requested address. Unlike Bsd mmap(), this
2230 // function returns NULL to indicate failure.
anon_mmap(char * requested_addr,size_t bytes,bool fixed)2231 static char* anon_mmap(char* requested_addr, size_t bytes, bool fixed) {
2232 char * addr;
2233 int flags;
2234
2235 flags = MAP_PRIVATE | MAP_NORESERVE | MAP_ANONYMOUS;
2236 if (fixed) {
2237 assert((uintptr_t)requested_addr % os::Bsd::page_size() == 0, "unaligned address");
2238 flags |= MAP_FIXED;
2239 }
2240
2241 // Map reserved/uncommitted pages PROT_NONE so we fail early if we
2242 // touch an uncommitted page. Otherwise, the read/write might
2243 // succeed if we have enough swap space to back the physical page.
2244 addr = (char*)::mmap(requested_addr, bytes, PROT_NONE,
2245 flags, -1, 0);
2246
2247 return addr == MAP_FAILED ? NULL : addr;
2248 }
2249
anon_munmap(char * addr,size_t size)2250 static int anon_munmap(char * addr, size_t size) {
2251 return ::munmap(addr, size) == 0;
2252 }
2253
pd_reserve_memory(size_t bytes,char * requested_addr,size_t alignment_hint)2254 char* os::pd_reserve_memory(size_t bytes, char* requested_addr,
2255 size_t alignment_hint) {
2256 return anon_mmap(requested_addr, bytes, (requested_addr != NULL));
2257 }
2258
pd_release_memory(char * addr,size_t size)2259 bool os::pd_release_memory(char* addr, size_t size) {
2260 return anon_munmap(addr, size);
2261 }
2262
bsd_mprotect(char * addr,size_t size,int prot)2263 static bool bsd_mprotect(char* addr, size_t size, int prot) {
2264 // Bsd wants the mprotect address argument to be page aligned.
2265 char* bottom = (char*)align_down((intptr_t)addr, os::Bsd::page_size());
2266
2267 // According to SUSv3, mprotect() should only be used with mappings
2268 // established by mmap(), and mmap() always maps whole pages. Unaligned
2269 // 'addr' likely indicates problem in the VM (e.g. trying to change
2270 // protection of malloc'ed or statically allocated memory). Check the
2271 // caller if you hit this assert.
2272 assert(addr == bottom, "sanity check");
2273
2274 size = align_up(pointer_delta(addr, bottom, 1) + size, os::Bsd::page_size());
2275 return ::mprotect(bottom, size, prot) == 0;
2276 }
2277
2278 // Set protections specified
protect_memory(char * addr,size_t bytes,ProtType prot,bool is_committed)2279 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
2280 bool is_committed) {
2281 unsigned int p = 0;
2282 switch (prot) {
2283 case MEM_PROT_NONE: p = PROT_NONE; break;
2284 case MEM_PROT_READ: p = PROT_READ; break;
2285 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break;
2286 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break;
2287 default:
2288 ShouldNotReachHere();
2289 }
2290 // is_committed is unused.
2291 return bsd_mprotect(addr, bytes, p);
2292 }
2293
guard_memory(char * addr,size_t size)2294 bool os::guard_memory(char* addr, size_t size) {
2295 return bsd_mprotect(addr, size, PROT_NONE);
2296 }
2297
unguard_memory(char * addr,size_t size)2298 bool os::unguard_memory(char* addr, size_t size) {
2299 return bsd_mprotect(addr, size, PROT_READ|PROT_WRITE);
2300 }
2301
hugetlbfs_sanity_check(bool warn,size_t page_size)2302 bool os::Bsd::hugetlbfs_sanity_check(bool warn, size_t page_size) {
2303 return false;
2304 }
2305
2306 // Large page support
2307
2308 static size_t _large_page_size = 0;
2309
large_page_init()2310 void os::large_page_init() {
2311 }
2312
2313
reserve_memory_special(size_t bytes,size_t alignment,char * req_addr,bool exec)2314 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* req_addr, bool exec) {
2315 fatal("os::reserve_memory_special should not be called on BSD.");
2316 return NULL;
2317 }
2318
release_memory_special(char * base,size_t bytes)2319 bool os::release_memory_special(char* base, size_t bytes) {
2320 fatal("os::release_memory_special should not be called on BSD.");
2321 return false;
2322 }
2323
large_page_size()2324 size_t os::large_page_size() {
2325 return _large_page_size;
2326 }
2327
can_commit_large_page_memory()2328 bool os::can_commit_large_page_memory() {
2329 // Does not matter, we do not support huge pages.
2330 return false;
2331 }
2332
can_execute_large_page_memory()2333 bool os::can_execute_large_page_memory() {
2334 // Does not matter, we do not support huge pages.
2335 return false;
2336 }
2337
pd_attempt_reserve_memory_at(size_t bytes,char * requested_addr,int file_desc)2338 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr, int file_desc) {
2339 assert(file_desc >= 0, "file_desc is not valid");
2340 char* result = pd_attempt_reserve_memory_at(bytes, requested_addr);
2341 if (result != NULL) {
2342 if (replace_existing_mapping_with_file_mapping(result, bytes, file_desc) == NULL) {
2343 vm_exit_during_initialization(err_msg("Error in mapping Java heap at the given filesystem directory"));
2344 }
2345 }
2346 return result;
2347 }
2348
2349 // Reserve memory at an arbitrary address, only if that area is
2350 // available (and not reserved for something else).
2351
pd_attempt_reserve_memory_at(size_t bytes,char * requested_addr)2352 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
2353 const int max_tries = 10;
2354 char* base[max_tries];
2355 size_t size[max_tries];
2356 const size_t gap = 0x000000;
2357
2358 // Assert only that the size is a multiple of the page size, since
2359 // that's all that mmap requires, and since that's all we really know
2360 // about at this low abstraction level. If we need higher alignment,
2361 // we can either pass an alignment to this method or verify alignment
2362 // in one of the methods further up the call chain. See bug 5044738.
2363 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block");
2364
2365 // Repeatedly allocate blocks until the block is allocated at the
2366 // right spot.
2367
2368 // Bsd mmap allows caller to pass an address as hint; give it a try first,
2369 // if kernel honors the hint then we can return immediately.
2370 char * addr = anon_mmap(requested_addr, bytes, false);
2371 if (addr == requested_addr) {
2372 return requested_addr;
2373 }
2374
2375 if (addr != NULL) {
2376 // mmap() is successful but it fails to reserve at the requested address
2377 anon_munmap(addr, bytes);
2378 }
2379
2380 int i;
2381 for (i = 0; i < max_tries; ++i) {
2382 base[i] = reserve_memory(bytes);
2383
2384 if (base[i] != NULL) {
2385 // Is this the block we wanted?
2386 if (base[i] == requested_addr) {
2387 size[i] = bytes;
2388 break;
2389 }
2390
2391 // Does this overlap the block we wanted? Give back the overlapped
2392 // parts and try again.
2393
2394 ptrdiff_t top_overlap = requested_addr + (bytes + gap) - base[i];
2395 if (top_overlap >= 0 && (size_t)top_overlap < bytes) {
2396 unmap_memory(base[i], top_overlap);
2397 base[i] += top_overlap;
2398 size[i] = bytes - top_overlap;
2399 } else {
2400 ptrdiff_t bottom_overlap = base[i] + bytes - requested_addr;
2401 if (bottom_overlap >= 0 && (size_t)bottom_overlap < bytes) {
2402 unmap_memory(requested_addr, bottom_overlap);
2403 size[i] = bytes - bottom_overlap;
2404 } else {
2405 size[i] = bytes;
2406 }
2407 }
2408 }
2409 }
2410
2411 // Give back the unused reserved pieces.
2412
2413 for (int j = 0; j < i; ++j) {
2414 if (base[j] != NULL) {
2415 unmap_memory(base[j], size[j]);
2416 }
2417 }
2418
2419 if (i < max_tries) {
2420 return requested_addr;
2421 } else {
2422 return NULL;
2423 }
2424 }
2425
read(int fd,void * buf,unsigned int nBytes)2426 size_t os::read(int fd, void *buf, unsigned int nBytes) {
2427 RESTARTABLE_RETURN_INT(::read(fd, buf, nBytes));
2428 }
2429
read_at(int fd,void * buf,unsigned int nBytes,jlong offset)2430 size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) {
2431 RESTARTABLE_RETURN_INT(::pread(fd, buf, nBytes, offset));
2432 }
2433
naked_short_sleep(jlong ms)2434 void os::naked_short_sleep(jlong ms) {
2435 struct timespec req;
2436
2437 assert(ms < 1000, "Un-interruptable sleep, short time use only");
2438 req.tv_sec = 0;
2439 if (ms > 0) {
2440 req.tv_nsec = (ms % 1000) * 1000000;
2441 } else {
2442 req.tv_nsec = 1;
2443 }
2444
2445 nanosleep(&req, NULL);
2446
2447 return;
2448 }
2449
2450 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
infinite_sleep()2451 void os::infinite_sleep() {
2452 while (true) { // sleep forever ...
2453 ::sleep(100); // ... 100 seconds at a time
2454 }
2455 }
2456
2457 // Used to convert frequent JVM_Yield() to nops
dont_yield()2458 bool os::dont_yield() {
2459 return DontYieldALot;
2460 }
2461
naked_yield()2462 void os::naked_yield() {
2463 sched_yield();
2464 }
2465
2466 ////////////////////////////////////////////////////////////////////////////////
2467 // thread priority support
2468
2469 // Note: Normal Bsd applications are run with SCHED_OTHER policy. SCHED_OTHER
2470 // only supports dynamic priority, static priority must be zero. For real-time
2471 // applications, Bsd supports SCHED_RR which allows static priority (1-99).
2472 // However, for large multi-threaded applications, SCHED_RR is not only slower
2473 // than SCHED_OTHER, but also very unstable (my volano tests hang hard 4 out
2474 // of 5 runs - Sep 2005).
2475 //
2476 // The following code actually changes the niceness of kernel-thread/LWP. It
2477 // has an assumption that setpriority() only modifies one kernel-thread/LWP,
2478 // not the entire user process, and user level threads are 1:1 mapped to kernel
2479 // threads. It has always been the case, but could change in the future. For
2480 // this reason, the code should not be used as default (ThreadPriorityPolicy=0).
2481 // It is only used when ThreadPriorityPolicy=1 and may require system level permission
2482 // (e.g., root privilege or CAP_SYS_NICE capability).
2483
2484 #if !defined(__APPLE__)
2485 int os::java_to_os_priority[CriticalPriority + 1] = {
2486 19, // 0 Entry should never be used
2487
2488 0, // 1 MinPriority
2489 3, // 2
2490 6, // 3
2491
2492 10, // 4
2493 15, // 5 NormPriority
2494 18, // 6
2495
2496 21, // 7
2497 25, // 8
2498 28, // 9 NearMaxPriority
2499
2500 31, // 10 MaxPriority
2501
2502 31 // 11 CriticalPriority
2503 };
2504 #else
2505 // Using Mach high-level priority assignments
2506 int os::java_to_os_priority[CriticalPriority + 1] = {
2507 0, // 0 Entry should never be used (MINPRI_USER)
2508
2509 27, // 1 MinPriority
2510 28, // 2
2511 29, // 3
2512
2513 30, // 4
2514 31, // 5 NormPriority (BASEPRI_DEFAULT)
2515 32, // 6
2516
2517 33, // 7
2518 34, // 8
2519 35, // 9 NearMaxPriority
2520
2521 36, // 10 MaxPriority
2522
2523 36 // 11 CriticalPriority
2524 };
2525 #endif
2526
prio_init()2527 static int prio_init() {
2528 if (ThreadPriorityPolicy == 1) {
2529 if (geteuid() != 0) {
2530 if (!FLAG_IS_DEFAULT(ThreadPriorityPolicy)) {
2531 warning("-XX:ThreadPriorityPolicy=1 may require system level permission, " \
2532 "e.g., being the root user. If the necessary permission is not " \
2533 "possessed, changes to priority will be silently ignored.");
2534 }
2535 }
2536 }
2537 if (UseCriticalJavaThreadPriority) {
2538 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority];
2539 }
2540 return 0;
2541 }
2542
set_native_priority(Thread * thread,int newpri)2543 OSReturn os::set_native_priority(Thread* thread, int newpri) {
2544 if (!UseThreadPriorities || ThreadPriorityPolicy == 0) return OS_OK;
2545
2546 struct sched_param sp;
2547 int policy;
2548 pthread_t self = pthread_self();
2549
2550 if (pthread_getschedparam(self, &policy, &sp) != 0) {
2551 return OS_ERR;
2552 }
2553
2554 sp.sched_priority = newpri;
2555 if (pthread_setschedparam(self, policy, &sp) != 0) {
2556 return OS_ERR;
2557 }
2558
2559 return OS_OK;
2560 }
2561
get_native_priority(const Thread * const thread,int * priority_ptr)2562 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) {
2563 if (!UseThreadPriorities || ThreadPriorityPolicy == 0) {
2564 *priority_ptr = java_to_os_priority[NormPriority];
2565 return OS_OK;
2566 }
2567
2568 errno = 0;
2569 int policy;
2570 struct sched_param sp;
2571
2572 pthread_getschedparam(pthread_self(), &policy, &sp);
2573 *priority_ptr = sp.sched_priority;
2574 return (*priority_ptr != -1 || errno == 0 ? OS_OK : OS_ERR);
2575 }
2576
2577 ////////////////////////////////////////////////////////////////////////////////
2578 // suspend/resume support
2579
2580 // The low-level signal-based suspend/resume support is a remnant from the
2581 // old VM-suspension that used to be for java-suspension, safepoints etc,
2582 // within hotspot. Currently used by JFR's OSThreadSampler
2583 //
2584 // The remaining code is greatly simplified from the more general suspension
2585 // code that used to be used.
2586 //
2587 // The protocol is quite simple:
2588 // - suspend:
2589 // - sends a signal to the target thread
2590 // - polls the suspend state of the osthread using a yield loop
2591 // - target thread signal handler (SR_handler) sets suspend state
2592 // and blocks in sigsuspend until continued
2593 // - resume:
2594 // - sets target osthread state to continue
2595 // - sends signal to end the sigsuspend loop in the SR_handler
2596 //
2597 // Note that the SR_lock plays no role in this suspend/resume protocol,
2598 // but is checked for NULL in SR_handler as a thread termination indicator.
2599 // The SR_lock is, however, used by JavaThread::java_suspend()/java_resume() APIs.
2600 //
2601 // Note that resume_clear_context() and suspend_save_context() are needed
2602 // by SR_handler(), so that fetch_frame_from_ucontext() works,
2603 // which in part is used by:
2604 // - Forte Analyzer: AsyncGetCallTrace()
2605 // - StackBanging: get_frame_at_stack_banging_point()
2606
resume_clear_context(OSThread * osthread)2607 static void resume_clear_context(OSThread *osthread) {
2608 osthread->set_ucontext(NULL);
2609 osthread->set_siginfo(NULL);
2610 }
2611
suspend_save_context(OSThread * osthread,siginfo_t * siginfo,ucontext_t * context)2612 static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) {
2613 osthread->set_ucontext(context);
2614 osthread->set_siginfo(siginfo);
2615 }
2616
2617 // Handler function invoked when a thread's execution is suspended or
2618 // resumed. We have to be careful that only async-safe functions are
2619 // called here (Note: most pthread functions are not async safe and
2620 // should be avoided.)
2621 //
2622 // Note: sigwait() is a more natural fit than sigsuspend() from an
2623 // interface point of view, but sigwait() prevents the signal hander
2624 // from being run. libpthread would get very confused by not having
2625 // its signal handlers run and prevents sigwait()'s use with the
2626 // mutex granting granting signal.
2627 //
2628 // Currently only ever called on the VMThread or JavaThread
2629 //
2630 #ifdef __APPLE__
2631 static OSXSemaphore sr_semaphore;
2632 #else
2633 static PosixSemaphore sr_semaphore;
2634 #endif
2635
SR_handler(int sig,siginfo_t * siginfo,ucontext_t * context)2636 static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) {
2637 // Save and restore errno to avoid confusing native code with EINTR
2638 // after sigsuspend.
2639 int old_errno = errno;
2640
2641 Thread* thread = Thread::current_or_null_safe();
2642 assert(thread != NULL, "Missing current thread in SR_handler");
2643
2644 // On some systems we have seen signal delivery get "stuck" until the signal
2645 // mask is changed as part of thread termination. Check that the current thread
2646 // has not already terminated (via SR_lock()) - else the following assertion
2647 // will fail because the thread is no longer a JavaThread as the ~JavaThread
2648 // destructor has completed.
2649
2650 if (thread->SR_lock() == NULL) {
2651 return;
2652 }
2653
2654 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread");
2655
2656 OSThread* osthread = thread->osthread();
2657
2658 os::SuspendResume::State current = osthread->sr.state();
2659 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) {
2660 suspend_save_context(osthread, siginfo, context);
2661
2662 // attempt to switch the state, we assume we had a SUSPEND_REQUEST
2663 os::SuspendResume::State state = osthread->sr.suspended();
2664 if (state == os::SuspendResume::SR_SUSPENDED) {
2665 sigset_t suspend_set; // signals for sigsuspend()
2666
2667 // get current set of blocked signals and unblock resume signal
2668 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set);
2669 sigdelset(&suspend_set, SR_signum);
2670
2671 sr_semaphore.signal();
2672 // wait here until we are resumed
2673 while (1) {
2674 sigsuspend(&suspend_set);
2675
2676 os::SuspendResume::State result = osthread->sr.running();
2677 if (result == os::SuspendResume::SR_RUNNING) {
2678 sr_semaphore.signal();
2679 break;
2680 } else if (result != os::SuspendResume::SR_SUSPENDED) {
2681 ShouldNotReachHere();
2682 }
2683 }
2684
2685 } else if (state == os::SuspendResume::SR_RUNNING) {
2686 // request was cancelled, continue
2687 } else {
2688 ShouldNotReachHere();
2689 }
2690
2691 resume_clear_context(osthread);
2692 } else if (current == os::SuspendResume::SR_RUNNING) {
2693 // request was cancelled, continue
2694 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) {
2695 // ignore
2696 } else {
2697 // ignore
2698 }
2699
2700 errno = old_errno;
2701 }
2702
2703
SR_initialize()2704 static int SR_initialize() {
2705 struct sigaction act;
2706 char *s;
2707 // Get signal number to use for suspend/resume
2708 if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) {
2709 int sig = ::strtol(s, 0, 10);
2710 if (sig > MAX2(SIGSEGV, SIGBUS) && // See 4355769.
2711 sig < NSIG) { // Must be legal signal and fit into sigflags[].
2712 SR_signum = sig;
2713 } else {
2714 warning("You set _JAVA_SR_SIGNUM=%d. It must be in range [%d, %d]. Using %d instead.",
2715 sig, MAX2(SIGSEGV, SIGBUS)+1, NSIG-1, SR_signum);
2716 }
2717 }
2718
2719 assert(SR_signum > SIGSEGV && SR_signum > SIGBUS,
2720 "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769");
2721
2722 sigemptyset(&SR_sigset);
2723 sigaddset(&SR_sigset, SR_signum);
2724
2725 // Set up signal handler for suspend/resume
2726 act.sa_flags = SA_RESTART|SA_SIGINFO;
2727 act.sa_handler = (void (*)(int)) SR_handler;
2728
2729 // SR_signum is blocked by default.
2730 // 4528190 - We also need to block pthread restart signal (32 on all
2731 // supported Bsd platforms). Note that BsdThreads need to block
2732 // this signal for all threads to work properly. So we don't have
2733 // to use hard-coded signal number when setting up the mask.
2734 pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask);
2735
2736 if (sigaction(SR_signum, &act, 0) == -1) {
2737 return -1;
2738 }
2739
2740 // Save signal flag
2741 os::Bsd::set_our_sigflags(SR_signum, act.sa_flags);
2742 return 0;
2743 }
2744
sr_notify(OSThread * osthread)2745 static int sr_notify(OSThread* osthread) {
2746 int status = pthread_kill(osthread->pthread_id(), SR_signum);
2747 assert_status(status == 0, status, "pthread_kill");
2748 return status;
2749 }
2750
2751 // "Randomly" selected value for how long we want to spin
2752 // before bailing out on suspending a thread, also how often
2753 // we send a signal to a thread we want to resume
2754 static const int RANDOMLY_LARGE_INTEGER = 1000000;
2755 static const int RANDOMLY_LARGE_INTEGER2 = 100;
2756
2757 // returns true on success and false on error - really an error is fatal
2758 // but this seems the normal response to library errors
do_suspend(OSThread * osthread)2759 static bool do_suspend(OSThread* osthread) {
2760 assert(osthread->sr.is_running(), "thread should be running");
2761 assert(!sr_semaphore.trywait(), "semaphore has invalid state");
2762
2763 // mark as suspended and send signal
2764 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) {
2765 // failed to switch, state wasn't running?
2766 ShouldNotReachHere();
2767 return false;
2768 }
2769
2770 if (sr_notify(osthread) != 0) {
2771 ShouldNotReachHere();
2772 }
2773
2774 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED
2775 while (true) {
2776 if (sr_semaphore.timedwait(create_semaphore_timespec(0, 2 * NANOSECS_PER_MILLISEC))) {
2777 break;
2778 } else {
2779 // timeout
2780 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend();
2781 if (cancelled == os::SuspendResume::SR_RUNNING) {
2782 return false;
2783 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) {
2784 // make sure that we consume the signal on the semaphore as well
2785 sr_semaphore.wait();
2786 break;
2787 } else {
2788 ShouldNotReachHere();
2789 return false;
2790 }
2791 }
2792 }
2793
2794 guarantee(osthread->sr.is_suspended(), "Must be suspended");
2795 return true;
2796 }
2797
do_resume(OSThread * osthread)2798 static void do_resume(OSThread* osthread) {
2799 assert(osthread->sr.is_suspended(), "thread should be suspended");
2800 assert(!sr_semaphore.trywait(), "invalid semaphore state");
2801
2802 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) {
2803 // failed to switch to WAKEUP_REQUEST
2804 ShouldNotReachHere();
2805 return;
2806 }
2807
2808 while (true) {
2809 if (sr_notify(osthread) == 0) {
2810 if (sr_semaphore.timedwait(create_semaphore_timespec(0, 2 * NANOSECS_PER_MILLISEC))) {
2811 if (osthread->sr.is_running()) {
2812 return;
2813 }
2814 }
2815 } else {
2816 ShouldNotReachHere();
2817 }
2818 }
2819
2820 guarantee(osthread->sr.is_running(), "Must be running!");
2821 }
2822
2823 ///////////////////////////////////////////////////////////////////////////////////
2824 // signal handling (except suspend/resume)
2825
2826 // This routine may be used by user applications as a "hook" to catch signals.
2827 // The user-defined signal handler must pass unrecognized signals to this
2828 // routine, and if it returns true (non-zero), then the signal handler must
2829 // return immediately. If the flag "abort_if_unrecognized" is true, then this
2830 // routine will never retun false (zero), but instead will execute a VM panic
2831 // routine kill the process.
2832 //
2833 // If this routine returns false, it is OK to call it again. This allows
2834 // the user-defined signal handler to perform checks either before or after
2835 // the VM performs its own checks. Naturally, the user code would be making
2836 // a serious error if it tried to handle an exception (such as a null check
2837 // or breakpoint) that the VM was generating for its own correct operation.
2838 //
2839 // This routine may recognize any of the following kinds of signals:
2840 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1.
2841 // It should be consulted by handlers for any of those signals.
2842 //
2843 // The caller of this routine must pass in the three arguments supplied
2844 // to the function referred to in the "sa_sigaction" (not the "sa_handler")
2845 // field of the structure passed to sigaction(). This routine assumes that
2846 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART.
2847 //
2848 // Note that the VM will print warnings if it detects conflicting signal
2849 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers".
2850 //
2851 extern "C" JNIEXPORT int JVM_handle_bsd_signal(int signo, siginfo_t* siginfo,
2852 void* ucontext,
2853 int abort_if_unrecognized);
2854
signalHandler(int sig,siginfo_t * info,void * uc)2855 static void signalHandler(int sig, siginfo_t* info, void* uc) {
2856 assert(info != NULL && uc != NULL, "it must be old kernel");
2857 int orig_errno = errno; // Preserve errno value over signal handler.
2858 JVM_handle_bsd_signal(sig, info, uc, true);
2859 errno = orig_errno;
2860 }
2861
2862
2863 // This boolean allows users to forward their own non-matching signals
2864 // to JVM_handle_bsd_signal, harmlessly.
2865 bool os::Bsd::signal_handlers_are_installed = false;
2866
2867 // For signal-chaining
2868 struct sigaction sigact[NSIG];
2869 uint64_t sigs = 0;
2870 #if (64 < NSIG-1)
2871 #error "Not all signals can be encoded in sigs. Adapt its type!"
2872 #endif
2873 bool os::Bsd::libjsig_is_loaded = false;
2874 typedef struct sigaction *(*get_signal_t)(int);
2875 get_signal_t os::Bsd::get_signal_action = NULL;
2876
get_chained_signal_action(int sig)2877 struct sigaction* os::Bsd::get_chained_signal_action(int sig) {
2878 struct sigaction *actp = NULL;
2879
2880 if (libjsig_is_loaded) {
2881 // Retrieve the old signal handler from libjsig
2882 actp = (*get_signal_action)(sig);
2883 }
2884 if (actp == NULL) {
2885 // Retrieve the preinstalled signal handler from jvm
2886 actp = get_preinstalled_handler(sig);
2887 }
2888
2889 return actp;
2890 }
2891
call_chained_handler(struct sigaction * actp,int sig,siginfo_t * siginfo,void * context)2892 static bool call_chained_handler(struct sigaction *actp, int sig,
2893 siginfo_t *siginfo, void *context) {
2894 // Call the old signal handler
2895 if (actp->sa_handler == SIG_DFL) {
2896 // It's more reasonable to let jvm treat it as an unexpected exception
2897 // instead of taking the default action.
2898 return false;
2899 } else if (actp->sa_handler != SIG_IGN) {
2900 if ((actp->sa_flags & SA_NODEFER) == 0) {
2901 // automaticlly block the signal
2902 sigaddset(&(actp->sa_mask), sig);
2903 }
2904
2905 sa_handler_t hand;
2906 sa_sigaction_t sa;
2907 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0;
2908 // retrieve the chained handler
2909 if (siginfo_flag_set) {
2910 sa = actp->sa_sigaction;
2911 } else {
2912 hand = actp->sa_handler;
2913 }
2914
2915 if ((actp->sa_flags & SA_RESETHAND) != 0) {
2916 actp->sa_handler = SIG_DFL;
2917 }
2918
2919 // try to honor the signal mask
2920 sigset_t oset;
2921 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset);
2922
2923 // call into the chained handler
2924 if (siginfo_flag_set) {
2925 (*sa)(sig, siginfo, context);
2926 } else {
2927 (*hand)(sig);
2928 }
2929
2930 // restore the signal mask
2931 pthread_sigmask(SIG_SETMASK, &oset, 0);
2932 }
2933 // Tell jvm's signal handler the signal is taken care of.
2934 return true;
2935 }
2936
chained_handler(int sig,siginfo_t * siginfo,void * context)2937 bool os::Bsd::chained_handler(int sig, siginfo_t* siginfo, void* context) {
2938 bool chained = false;
2939 // signal-chaining
2940 if (UseSignalChaining) {
2941 struct sigaction *actp = get_chained_signal_action(sig);
2942 if (actp != NULL) {
2943 chained = call_chained_handler(actp, sig, siginfo, context);
2944 }
2945 }
2946 return chained;
2947 }
2948
get_preinstalled_handler(int sig)2949 struct sigaction* os::Bsd::get_preinstalled_handler(int sig) {
2950 if ((((uint64_t)1 << (sig-1)) & sigs) != 0) {
2951 return &sigact[sig];
2952 }
2953 return NULL;
2954 }
2955
save_preinstalled_handler(int sig,struct sigaction & oldAct)2956 void os::Bsd::save_preinstalled_handler(int sig, struct sigaction& oldAct) {
2957 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
2958 sigact[sig] = oldAct;
2959 sigs |= (uint64_t)1 << (sig-1);
2960 }
2961
2962 // for diagnostic
2963 int sigflags[NSIG];
2964
get_our_sigflags(int sig)2965 int os::Bsd::get_our_sigflags(int sig) {
2966 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
2967 return sigflags[sig];
2968 }
2969
set_our_sigflags(int sig,int flags)2970 void os::Bsd::set_our_sigflags(int sig, int flags) {
2971 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
2972 if (sig > 0 && sig < NSIG) {
2973 sigflags[sig] = flags;
2974 }
2975 }
2976
set_signal_handler(int sig,bool set_installed)2977 void os::Bsd::set_signal_handler(int sig, bool set_installed) {
2978 // Check for overwrite.
2979 struct sigaction oldAct;
2980 sigaction(sig, (struct sigaction*)NULL, &oldAct);
2981
2982 void* oldhand = oldAct.sa_sigaction
2983 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
2984 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
2985 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) &&
2986 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) &&
2987 oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)signalHandler)) {
2988 if (AllowUserSignalHandlers || !set_installed) {
2989 // Do not overwrite; user takes responsibility to forward to us.
2990 return;
2991 } else if (UseSignalChaining) {
2992 // save the old handler in jvm
2993 save_preinstalled_handler(sig, oldAct);
2994 // libjsig also interposes the sigaction() call below and saves the
2995 // old sigaction on it own.
2996 } else {
2997 fatal("Encountered unexpected pre-existing sigaction handler "
2998 "%#lx for signal %d.", (long)oldhand, sig);
2999 }
3000 }
3001
3002 struct sigaction sigAct;
3003 sigfillset(&(sigAct.sa_mask));
3004 sigAct.sa_handler = SIG_DFL;
3005 if (!set_installed) {
3006 sigAct.sa_flags = SA_SIGINFO|SA_RESTART;
3007 } else {
3008 sigAct.sa_sigaction = signalHandler;
3009 sigAct.sa_flags = SA_SIGINFO|SA_RESTART;
3010 }
3011 #ifdef __APPLE__
3012 // Needed for main thread as XNU (Mac OS X kernel) will only deliver SIGSEGV
3013 // (which starts as SIGBUS) on main thread with faulting address inside "stack+guard pages"
3014 // if the signal handler declares it will handle it on alternate stack.
3015 // Notice we only declare we will handle it on alt stack, but we are not
3016 // actually going to use real alt stack - this is just a workaround.
3017 // Please see ux_exception.c, method catch_mach_exception_raise for details
3018 // link http://www.opensource.apple.com/source/xnu/xnu-2050.18.24/bsd/uxkern/ux_exception.c
3019 if (sig == SIGSEGV) {
3020 sigAct.sa_flags |= SA_ONSTACK;
3021 }
3022 #endif
3023
3024 // Save flags, which are set by ours
3025 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
3026 sigflags[sig] = sigAct.sa_flags;
3027
3028 int ret = sigaction(sig, &sigAct, &oldAct);
3029 assert(ret == 0, "check");
3030
3031 void* oldhand2 = oldAct.sa_sigaction
3032 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3033 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3034 assert(oldhand2 == oldhand, "no concurrent signal handler installation");
3035 }
3036
3037 // install signal handlers for signals that HotSpot needs to
3038 // handle in order to support Java-level exception handling.
3039
install_signal_handlers()3040 void os::Bsd::install_signal_handlers() {
3041 if (!signal_handlers_are_installed) {
3042 signal_handlers_are_installed = true;
3043
3044 // signal-chaining
3045 typedef void (*signal_setting_t)();
3046 signal_setting_t begin_signal_setting = NULL;
3047 signal_setting_t end_signal_setting = NULL;
3048 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
3049 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting"));
3050 if (begin_signal_setting != NULL) {
3051 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
3052 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting"));
3053 get_signal_action = CAST_TO_FN_PTR(get_signal_t,
3054 dlsym(RTLD_DEFAULT, "JVM_get_signal_action"));
3055 libjsig_is_loaded = true;
3056 assert(UseSignalChaining, "should enable signal-chaining");
3057 }
3058 if (libjsig_is_loaded) {
3059 // Tell libjsig jvm is setting signal handlers
3060 (*begin_signal_setting)();
3061 }
3062
3063 set_signal_handler(SIGSEGV, true);
3064 set_signal_handler(SIGPIPE, true);
3065 set_signal_handler(SIGBUS, true);
3066 set_signal_handler(SIGILL, true);
3067 set_signal_handler(SIGFPE, true);
3068 #if defined(PPC64)
3069 set_signal_handler(SIGTRAP, true);
3070 #endif
3071 set_signal_handler(SIGXFSZ, true);
3072
3073 #if defined(__APPLE__)
3074 // In Mac OS X 10.4, CrashReporter will write a crash log for all 'fatal' signals, including
3075 // signals caught and handled by the JVM. To work around this, we reset the mach task
3076 // signal handler that's placed on our process by CrashReporter. This disables
3077 // CrashReporter-based reporting.
3078 //
3079 // This work-around is not necessary for 10.5+, as CrashReporter no longer intercedes
3080 // on caught fatal signals.
3081 //
3082 // Additionally, gdb installs both standard BSD signal handlers, and mach exception
3083 // handlers. By replacing the existing task exception handler, we disable gdb's mach
3084 // exception handling, while leaving the standard BSD signal handlers functional.
3085 kern_return_t kr;
3086 kr = task_set_exception_ports(mach_task_self(),
3087 EXC_MASK_BAD_ACCESS | EXC_MASK_ARITHMETIC,
3088 MACH_PORT_NULL,
3089 EXCEPTION_STATE_IDENTITY,
3090 MACHINE_THREAD_STATE);
3091
3092 assert(kr == KERN_SUCCESS, "could not set mach task signal handler");
3093 #endif
3094
3095 if (libjsig_is_loaded) {
3096 // Tell libjsig jvm finishes setting signal handlers
3097 (*end_signal_setting)();
3098 }
3099
3100 // We don't activate signal checker if libjsig is in place, we trust ourselves
3101 // and if UserSignalHandler is installed all bets are off
3102 if (CheckJNICalls) {
3103 if (libjsig_is_loaded) {
3104 if (PrintJNIResolving) {
3105 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled");
3106 }
3107 check_signals = false;
3108 }
3109 if (AllowUserSignalHandlers) {
3110 if (PrintJNIResolving) {
3111 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled");
3112 }
3113 check_signals = false;
3114 }
3115 }
3116 }
3117 }
3118
3119
3120 /////
3121 // glibc on Bsd platform uses non-documented flag
3122 // to indicate, that some special sort of signal
3123 // trampoline is used.
3124 // We will never set this flag, and we should
3125 // ignore this flag in our diagnostic
3126 #ifdef SIGNIFICANT_SIGNAL_MASK
3127 #undef SIGNIFICANT_SIGNAL_MASK
3128 #endif
3129
3130 #ifdef __APPLE__
3131 #define SIGNIFICANT_SIGNAL_MASK (~0x04000000)
3132 #else
3133 #define SIGNIFICANT_SIGNAL_MASK (~0x00000000)
3134 #endif
3135
get_signal_handler_name(address handler,char * buf,int buflen)3136 static const char* get_signal_handler_name(address handler,
3137 char* buf, int buflen) {
3138 int offset = 0;
3139 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset);
3140 if (found) {
3141 // skip directory names
3142 const char *p1, *p2;
3143 p1 = buf;
3144 size_t len = strlen(os::file_separator());
3145 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len;
3146 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset);
3147 } else {
3148 jio_snprintf(buf, buflen, PTR_FORMAT, handler);
3149 }
3150 return buf;
3151 }
3152
print_signal_handler(outputStream * st,int sig,char * buf,size_t buflen)3153 static void print_signal_handler(outputStream* st, int sig,
3154 char* buf, size_t buflen) {
3155 struct sigaction sa;
3156
3157 sigaction(sig, NULL, &sa);
3158
3159 // See comment for SIGNIFICANT_SIGNAL_MASK define
3160 sa.sa_flags &= SIGNIFICANT_SIGNAL_MASK;
3161
3162 st->print("%s: ", os::exception_name(sig, buf, buflen));
3163
3164 address handler = (sa.sa_flags & SA_SIGINFO)
3165 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction)
3166 : CAST_FROM_FN_PTR(address, sa.sa_handler);
3167
3168 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) {
3169 st->print("SIG_DFL");
3170 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) {
3171 st->print("SIG_IGN");
3172 } else {
3173 st->print("[%s]", get_signal_handler_name(handler, buf, buflen));
3174 }
3175
3176 st->print(", sa_mask[0]=");
3177 os::Posix::print_signal_set_short(st, &sa.sa_mask);
3178
3179 address rh = VMError::get_resetted_sighandler(sig);
3180 // May be, handler was resetted by VMError?
3181 if (rh != NULL) {
3182 handler = rh;
3183 sa.sa_flags = VMError::get_resetted_sigflags(sig) & SIGNIFICANT_SIGNAL_MASK;
3184 }
3185
3186 st->print(", sa_flags=");
3187 os::Posix::print_sa_flags(st, sa.sa_flags);
3188
3189 // Check: is it our handler?
3190 if (handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler) ||
3191 handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) {
3192 // It is our signal handler
3193 // check for flags, reset system-used one!
3194 if ((int)sa.sa_flags != os::Bsd::get_our_sigflags(sig)) {
3195 st->print(
3196 ", flags was changed from " PTR32_FORMAT ", consider using jsig library",
3197 os::Bsd::get_our_sigflags(sig));
3198 }
3199 }
3200 st->cr();
3201 }
3202
3203
3204 #define DO_SIGNAL_CHECK(sig) \
3205 do { \
3206 if (!sigismember(&check_signal_done, sig)) { \
3207 os::Bsd::check_signal_handler(sig); \
3208 } \
3209 } while (0)
3210
3211 // This method is a periodic task to check for misbehaving JNI applications
3212 // under CheckJNI, we can add any periodic checks here
3213
run_periodic_checks()3214 void os::run_periodic_checks() {
3215
3216 if (check_signals == false) return;
3217
3218 // SEGV and BUS if overridden could potentially prevent
3219 // generation of hs*.log in the event of a crash, debugging
3220 // such a case can be very challenging, so we absolutely
3221 // check the following for a good measure:
3222 DO_SIGNAL_CHECK(SIGSEGV);
3223 DO_SIGNAL_CHECK(SIGILL);
3224 DO_SIGNAL_CHECK(SIGFPE);
3225 DO_SIGNAL_CHECK(SIGBUS);
3226 DO_SIGNAL_CHECK(SIGPIPE);
3227 DO_SIGNAL_CHECK(SIGXFSZ);
3228 #if defined(PPC64)
3229 DO_SIGNAL_CHECK(SIGTRAP);
3230 #endif
3231
3232
3233 // ReduceSignalUsage allows the user to override these handlers
3234 // see comments at the very top and jvm_md.h
3235 if (!ReduceSignalUsage) {
3236 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL);
3237 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL);
3238 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL);
3239 DO_SIGNAL_CHECK(BREAK_SIGNAL);
3240 }
3241
3242 DO_SIGNAL_CHECK(SR_signum);
3243 }
3244
3245 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *);
3246
3247 static os_sigaction_t os_sigaction = NULL;
3248
check_signal_handler(int sig)3249 void os::Bsd::check_signal_handler(int sig) {
3250 char buf[O_BUFLEN];
3251 address jvmHandler = NULL;
3252
3253
3254 struct sigaction act;
3255 if (os_sigaction == NULL) {
3256 // only trust the default sigaction, in case it has been interposed
3257 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction");
3258 if (os_sigaction == NULL) return;
3259 }
3260
3261 os_sigaction(sig, (struct sigaction*)NULL, &act);
3262
3263
3264 act.sa_flags &= SIGNIFICANT_SIGNAL_MASK;
3265
3266 address thisHandler = (act.sa_flags & SA_SIGINFO)
3267 ? CAST_FROM_FN_PTR(address, act.sa_sigaction)
3268 : CAST_FROM_FN_PTR(address, act.sa_handler);
3269
3270
3271 switch (sig) {
3272 case SIGSEGV:
3273 case SIGBUS:
3274 case SIGFPE:
3275 case SIGPIPE:
3276 case SIGILL:
3277 case SIGXFSZ:
3278 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler);
3279 break;
3280
3281 case SHUTDOWN1_SIGNAL:
3282 case SHUTDOWN2_SIGNAL:
3283 case SHUTDOWN3_SIGNAL:
3284 case BREAK_SIGNAL:
3285 jvmHandler = (address)user_handler();
3286 break;
3287
3288 default:
3289 if (sig == SR_signum) {
3290 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler);
3291 } else {
3292 return;
3293 }
3294 break;
3295 }
3296
3297 if (thisHandler != jvmHandler) {
3298 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN));
3299 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN));
3300 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN));
3301 // No need to check this sig any longer
3302 sigaddset(&check_signal_done, sig);
3303 // Running under non-interactive shell, SHUTDOWN2_SIGNAL will be reassigned SIG_IGN
3304 if (sig == SHUTDOWN2_SIGNAL && !isatty(fileno(stdin))) {
3305 tty->print_cr("Running in non-interactive shell, %s handler is replaced by shell",
3306 exception_name(sig, buf, O_BUFLEN));
3307 }
3308 } else if(os::Bsd::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Bsd::get_our_sigflags(sig)) {
3309 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN));
3310 tty->print("expected:");
3311 os::Posix::print_sa_flags(tty, os::Bsd::get_our_sigflags(sig));
3312 tty->cr();
3313 tty->print(" found:");
3314 os::Posix::print_sa_flags(tty, act.sa_flags);
3315 tty->cr();
3316 // No need to check this sig any longer
3317 sigaddset(&check_signal_done, sig);
3318 }
3319
3320 // Dump all the signal
3321 if (sigismember(&check_signal_done, sig)) {
3322 print_signal_handlers(tty, buf, O_BUFLEN);
3323 }
3324 }
3325
3326 extern void report_error(char* file_name, int line_no, char* title,
3327 char* format, ...);
3328
3329 // this is called _before_ the most of global arguments have been parsed
init(void)3330 void os::init(void) {
3331 char dummy; // used to get a guess on initial stack address
3332
3333 // With BsdThreads the JavaMain thread pid (primordial thread)
3334 // is different than the pid of the java launcher thread.
3335 // So, on Bsd, the launcher thread pid is passed to the VM
3336 // via the sun.java.launcher.pid property.
3337 // Use this property instead of getpid() if it was correctly passed.
3338 // See bug 6351349.
3339 pid_t java_launcher_pid = (pid_t) Arguments::sun_java_launcher_pid();
3340
3341 _initial_pid = (java_launcher_pid > 0) ? java_launcher_pid : getpid();
3342
3343 clock_tics_per_sec = CLK_TCK;
3344
3345 init_random(1234567);
3346
3347 Bsd::set_page_size(getpagesize());
3348 if (Bsd::page_size() == -1) {
3349 fatal("os_bsd.cpp: os::init: sysconf failed (%s)", os::strerror(errno));
3350 }
3351 init_page_sizes((size_t) Bsd::page_size());
3352
3353 Bsd::initialize_system_info();
3354
3355 // _main_thread points to the thread that created/loaded the JVM.
3356 Bsd::_main_thread = pthread_self();
3357
3358 Bsd::clock_init();
3359 initial_time_count = javaTimeNanos();
3360
3361 os::Posix::init();
3362 }
3363
3364 // To install functions for atexit system call
3365 extern "C" {
perfMemory_exit_helper()3366 static void perfMemory_exit_helper() {
3367 perfMemory_exit();
3368 }
3369 }
3370
3371 // this is called _after_ the global arguments have been parsed
init_2(void)3372 jint os::init_2(void) {
3373
3374 // This could be set after os::Posix::init() but all platforms
3375 // have to set it the same so we have to mirror Solaris.
3376 DEBUG_ONLY(os::set_mutex_init_done();)
3377
3378 os::Posix::init_2();
3379
3380 // initialize suspend/resume support - must do this before signal_sets_init()
3381 if (SR_initialize() != 0) {
3382 perror("SR_initialize failed");
3383 return JNI_ERR;
3384 }
3385
3386 Bsd::signal_sets_init();
3387 Bsd::install_signal_handlers();
3388 // Initialize data for jdk.internal.misc.Signal
3389 if (!ReduceSignalUsage) {
3390 jdk_misc_signal_init();
3391 }
3392
3393 // Check and sets minimum stack sizes against command line options
3394 if (Posix::set_minimum_stack_sizes() == JNI_ERR) {
3395 return JNI_ERR;
3396 }
3397
3398 if (MaxFDLimit) {
3399 // set the number of file descriptors to max. print out error
3400 // if getrlimit/setrlimit fails but continue regardless.
3401 struct rlimit nbr_files;
3402 int status = getrlimit(RLIMIT_NOFILE, &nbr_files);
3403 if (status != 0) {
3404 log_info(os)("os::init_2 getrlimit failed: %s", os::strerror(errno));
3405 } else {
3406 nbr_files.rlim_cur = nbr_files.rlim_max;
3407
3408 #ifdef __APPLE__
3409 // Darwin returns RLIM_INFINITY for rlim_max, but fails with EINVAL if
3410 // you attempt to use RLIM_INFINITY. As per setrlimit(2), OPEN_MAX must
3411 // be used instead
3412 nbr_files.rlim_cur = MIN(OPEN_MAX, nbr_files.rlim_cur);
3413 #endif
3414
3415 status = setrlimit(RLIMIT_NOFILE, &nbr_files);
3416 if (status != 0) {
3417 log_info(os)("os::init_2 setrlimit failed: %s", os::strerror(errno));
3418 }
3419 }
3420 }
3421
3422 // at-exit methods are called in the reverse order of their registration.
3423 // atexit functions are called on return from main or as a result of a
3424 // call to exit(3C). There can be only 32 of these functions registered
3425 // and atexit() does not set errno.
3426
3427 if (PerfAllowAtExitRegistration) {
3428 // only register atexit functions if PerfAllowAtExitRegistration is set.
3429 // atexit functions can be delayed until process exit time, which
3430 // can be problematic for embedded VM situations. Embedded VMs should
3431 // call DestroyJavaVM() to assure that VM resources are released.
3432
3433 // note: perfMemory_exit_helper atexit function may be removed in
3434 // the future if the appropriate cleanup code can be added to the
3435 // VM_Exit VMOperation's doit method.
3436 if (atexit(perfMemory_exit_helper) != 0) {
3437 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
3438 }
3439 }
3440
3441 // initialize thread priority policy
3442 prio_init();
3443
3444 #ifdef __APPLE__
3445 // dynamically link to objective c gc registration
3446 void *handleLibObjc = dlopen(OBJC_LIB, RTLD_LAZY);
3447 if (handleLibObjc != NULL) {
3448 objc_registerThreadWithCollectorFunction = (objc_registerThreadWithCollector_t) dlsym(handleLibObjc, OBJC_GCREGISTER);
3449 }
3450 #endif
3451
3452 return JNI_OK;
3453 }
3454
3455 // Mark the polling page as unreadable
make_polling_page_unreadable(void)3456 void os::make_polling_page_unreadable(void) {
3457 if (!guard_memory((char*)_polling_page, Bsd::page_size())) {
3458 fatal("Could not disable polling page");
3459 }
3460 }
3461
3462 // Mark the polling page as readable
make_polling_page_readable(void)3463 void os::make_polling_page_readable(void) {
3464 if (!bsd_mprotect((char *)_polling_page, Bsd::page_size(), PROT_READ)) {
3465 fatal("Could not enable polling page");
3466 }
3467 }
3468
active_processor_count()3469 int os::active_processor_count() {
3470 // User has overridden the number of active processors
3471 if (ActiveProcessorCount > 0) {
3472 log_trace(os)("active_processor_count: "
3473 "active processor count set by user : %d",
3474 ActiveProcessorCount);
3475 return ActiveProcessorCount;
3476 }
3477
3478 #ifdef __DragonFly__
3479 return sysconf(_SC_NPROCESSORS_ONLN);
3480 #endif
3481
3482 #ifdef __FreeBSD__
3483 int online_cpus = 0;
3484 cpuset_t mask;
3485 if (cpuset_getaffinity(CPU_LEVEL_WHICH, CPU_WHICH_PID, -1, sizeof(mask),
3486 &mask) == 0)
3487 for (u_int i = 0; i < sizeof(mask) / sizeof(long); i++)
3488 online_cpus += __builtin_popcountl(((long *)&mask)[i]);
3489 if (online_cpus > 0 && online_cpus <= _processor_count)
3490 return online_cpus;
3491 online_cpus = sysconf(_SC_NPROCESSORS_ONLN);
3492 if (online_cpus >= 1)
3493 return online_cpus;
3494 #endif
3495
3496 return _processor_count;
3497 }
3498
set_native_thread_name(const char * name)3499 void os::set_native_thread_name(const char *name) {
3500 #if defined(__APPLE__) && MAC_OS_X_VERSION_MIN_REQUIRED > MAC_OS_X_VERSION_10_5
3501 // This is only supported in Snow Leopard and beyond
3502 if (name != NULL) {
3503 // Add a "Java: " prefix to the name
3504 char buf[MAXTHREADNAMESIZE];
3505 snprintf(buf, sizeof(buf), "Java: %s", name);
3506 pthread_setname_np(buf);
3507 }
3508 #endif
3509 }
3510
distribute_processes(uint length,uint * distribution)3511 bool os::distribute_processes(uint length, uint* distribution) {
3512 // Not yet implemented.
3513 return false;
3514 }
3515
bind_to_processor(uint processor_id)3516 bool os::bind_to_processor(uint processor_id) {
3517 // Not yet implemented.
3518 return false;
3519 }
3520
internal_do_task()3521 void os::SuspendedThreadTask::internal_do_task() {
3522 if (do_suspend(_thread->osthread())) {
3523 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext());
3524 do_task(context);
3525 do_resume(_thread->osthread());
3526 }
3527 }
3528
3529 ////////////////////////////////////////////////////////////////////////////////
3530 // debug support
3531
find(address addr,outputStream * st)3532 bool os::find(address addr, outputStream* st) {
3533 Dl_info dlinfo;
3534 memset(&dlinfo, 0, sizeof(dlinfo));
3535 if (dladdr(addr, &dlinfo) != 0) {
3536 st->print(INTPTR_FORMAT ": ", (intptr_t)addr);
3537 if (dlinfo.dli_sname != NULL && dlinfo.dli_saddr != NULL) {
3538 st->print("%s+%#x", dlinfo.dli_sname,
3539 (uint)((uintptr_t)addr - (uintptr_t)dlinfo.dli_saddr));
3540 } else if (dlinfo.dli_fbase != NULL) {
3541 st->print("<offset %#x>", (uint)((uintptr_t)addr - (uintptr_t)dlinfo.dli_fbase));
3542 } else {
3543 st->print("<absolute address>");
3544 }
3545 if (dlinfo.dli_fname != NULL) {
3546 st->print(" in %s", dlinfo.dli_fname);
3547 }
3548 if (dlinfo.dli_fbase != NULL) {
3549 st->print(" at " INTPTR_FORMAT, (intptr_t)dlinfo.dli_fbase);
3550 }
3551 st->cr();
3552
3553 if (Verbose) {
3554 // decode some bytes around the PC
3555 address begin = clamp_address_in_page(addr-40, addr, os::vm_page_size());
3556 address end = clamp_address_in_page(addr+40, addr, os::vm_page_size());
3557 address lowest = (address) dlinfo.dli_sname;
3558 if (!lowest) lowest = (address) dlinfo.dli_fbase;
3559 if (begin < lowest) begin = lowest;
3560 Dl_info dlinfo2;
3561 if (dladdr(end, &dlinfo2) != 0 && dlinfo2.dli_saddr != dlinfo.dli_saddr
3562 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) {
3563 end = (address) dlinfo2.dli_saddr;
3564 }
3565 Disassembler::decode(begin, end, st);
3566 }
3567 return true;
3568 }
3569 return false;
3570 }
3571
3572 ////////////////////////////////////////////////////////////////////////////////
3573 // misc
3574
3575 // This does not do anything on Bsd. This is basically a hook for being
3576 // able to use structured exception handling (thread-local exception filters)
3577 // on, e.g., Win32.
os_exception_wrapper(java_call_t f,JavaValue * value,const methodHandle & method,JavaCallArguments * args,Thread * thread)3578 void os::os_exception_wrapper(java_call_t f, JavaValue* value,
3579 const methodHandle& method, JavaCallArguments* args,
3580 Thread* thread) {
3581 f(value, method, args, thread);
3582 }
3583
print_statistics()3584 void os::print_statistics() {
3585 }
3586
message_box(const char * title,const char * message)3587 bool os::message_box(const char* title, const char* message) {
3588 int i;
3589 fdStream err(defaultStream::error_fd());
3590 for (i = 0; i < 78; i++) err.print_raw("=");
3591 err.cr();
3592 err.print_raw_cr(title);
3593 for (i = 0; i < 78; i++) err.print_raw("-");
3594 err.cr();
3595 err.print_raw_cr(message);
3596 for (i = 0; i < 78; i++) err.print_raw("=");
3597 err.cr();
3598
3599 char buf[16];
3600 // Prevent process from exiting upon "read error" without consuming all CPU
3601 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); }
3602
3603 return buf[0] == 'y' || buf[0] == 'Y';
3604 }
3605
get_mtime(const char * filename)3606 static inline struct timespec get_mtime(const char* filename) {
3607 struct stat st;
3608 int ret = os::stat(filename, &st);
3609 assert(ret == 0, "failed to stat() file '%s': %s", filename, os::strerror(errno));
3610 #ifdef __APPLE__
3611 return st.st_mtimespec;
3612 #else
3613 return st.st_mtim;
3614 #endif
3615 }
3616
compare_file_modified_times(const char * file1,const char * file2)3617 int os::compare_file_modified_times(const char* file1, const char* file2) {
3618 struct timespec filetime1 = get_mtime(file1);
3619 struct timespec filetime2 = get_mtime(file2);
3620 int diff = filetime1.tv_sec - filetime2.tv_sec;
3621 if (diff == 0) {
3622 return filetime1.tv_nsec - filetime2.tv_nsec;
3623 }
3624 return diff;
3625 }
3626
3627 // Is a (classpath) directory empty?
dir_is_empty(const char * path)3628 bool os::dir_is_empty(const char* path) {
3629 DIR *dir = NULL;
3630 struct dirent *ptr;
3631
3632 dir = opendir(path);
3633 if (dir == NULL) return true;
3634
3635 // Scan the directory
3636 bool result = true;
3637 while (result && (ptr = readdir(dir)) != NULL) {
3638 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) {
3639 result = false;
3640 }
3641 }
3642 closedir(dir);
3643 return result;
3644 }
3645
3646 // This code originates from JDK's sysOpen and open64_w
3647 // from src/solaris/hpi/src/system_md.c
3648
open(const char * path,int oflag,int mode)3649 int os::open(const char *path, int oflag, int mode) {
3650 if (strlen(path) > MAX_PATH - 1) {
3651 errno = ENAMETOOLONG;
3652 return -1;
3653 }
3654 int fd;
3655
3656 fd = ::open(path, oflag, mode);
3657 if (fd == -1) return -1;
3658
3659 // If the open succeeded, the file might still be a directory
3660 {
3661 struct stat buf;
3662 int ret = ::fstat(fd, &buf);
3663 int st_mode = buf.st_mode;
3664
3665 if (ret != -1) {
3666 if ((st_mode & S_IFMT) == S_IFDIR) {
3667 errno = EISDIR;
3668 ::close(fd);
3669 return -1;
3670 }
3671 } else {
3672 ::close(fd);
3673 return -1;
3674 }
3675 }
3676
3677 // All file descriptors that are opened in the JVM and not
3678 // specifically destined for a subprocess should have the
3679 // close-on-exec flag set. If we don't set it, then careless 3rd
3680 // party native code might fork and exec without closing all
3681 // appropriate file descriptors (e.g. as we do in closeDescriptors in
3682 // UNIXProcess.c), and this in turn might:
3683 //
3684 // - cause end-of-file to fail to be detected on some file
3685 // descriptors, resulting in mysterious hangs, or
3686 //
3687 // - might cause an fopen in the subprocess to fail on a system
3688 // suffering from bug 1085341.
3689 //
3690 // (Yes, the default setting of the close-on-exec flag is a Unix
3691 // design flaw)
3692 //
3693 // See:
3694 // 1085341: 32-bit stdio routines should support file descriptors >255
3695 // 4843136: (process) pipe file descriptor from Runtime.exec not being closed
3696 // 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9
3697 //
3698 #ifdef FD_CLOEXEC
3699 {
3700 int flags = ::fcntl(fd, F_GETFD);
3701 if (flags != -1) {
3702 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
3703 }
3704 }
3705 #endif
3706
3707 return fd;
3708 }
3709
3710
3711 // create binary file, rewriting existing file if required
create_binary_file(const char * path,bool rewrite_existing)3712 int os::create_binary_file(const char* path, bool rewrite_existing) {
3713 int oflags = O_WRONLY | O_CREAT;
3714 if (!rewrite_existing) {
3715 oflags |= O_EXCL;
3716 }
3717 return ::open(path, oflags, S_IREAD | S_IWRITE);
3718 }
3719
3720 // return current position of file pointer
current_file_offset(int fd)3721 jlong os::current_file_offset(int fd) {
3722 return (jlong)::lseek(fd, (off_t)0, SEEK_CUR);
3723 }
3724
3725 // move file pointer to the specified offset
seek_to_file_offset(int fd,jlong offset)3726 jlong os::seek_to_file_offset(int fd, jlong offset) {
3727 return (jlong)::lseek(fd, (off_t)offset, SEEK_SET);
3728 }
3729
3730 // This code originates from JDK's sysAvailable
3731 // from src/solaris/hpi/src/native_threads/src/sys_api_td.c
3732
available(int fd,jlong * bytes)3733 int os::available(int fd, jlong *bytes) {
3734 jlong cur, end;
3735 int mode;
3736 struct stat buf;
3737
3738 if (::fstat(fd, &buf) >= 0) {
3739 mode = buf.st_mode;
3740 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) {
3741 int n;
3742 if (::ioctl(fd, FIONREAD, &n) >= 0) {
3743 *bytes = n;
3744 return 1;
3745 }
3746 }
3747 }
3748 if ((cur = ::lseek(fd, 0L, SEEK_CUR)) == -1) {
3749 return 0;
3750 } else if ((end = ::lseek(fd, 0L, SEEK_END)) == -1) {
3751 return 0;
3752 } else if (::lseek(fd, cur, SEEK_SET) == -1) {
3753 return 0;
3754 }
3755 *bytes = end - cur;
3756 return 1;
3757 }
3758
3759 // Map a block of memory.
pd_map_memory(int fd,const char * file_name,size_t file_offset,char * addr,size_t bytes,bool read_only,bool allow_exec)3760 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
3761 char *addr, size_t bytes, bool read_only,
3762 bool allow_exec) {
3763 int prot;
3764 int flags;
3765
3766 if (read_only) {
3767 prot = PROT_READ;
3768 flags = MAP_SHARED;
3769 } else {
3770 prot = PROT_READ | PROT_WRITE;
3771 flags = MAP_PRIVATE;
3772 }
3773
3774 if (allow_exec) {
3775 prot |= PROT_EXEC;
3776 }
3777
3778 if (addr != NULL) {
3779 flags |= MAP_FIXED;
3780 }
3781
3782 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags,
3783 fd, file_offset);
3784 if (mapped_address == MAP_FAILED) {
3785 return NULL;
3786 }
3787 return mapped_address;
3788 }
3789
3790
3791 // Remap a block of memory.
pd_remap_memory(int fd,const char * file_name,size_t file_offset,char * addr,size_t bytes,bool read_only,bool allow_exec)3792 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
3793 char *addr, size_t bytes, bool read_only,
3794 bool allow_exec) {
3795 // same as map_memory() on this OS
3796 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only,
3797 allow_exec);
3798 }
3799
3800
3801 // Unmap a block of memory.
pd_unmap_memory(char * addr,size_t bytes)3802 bool os::pd_unmap_memory(char* addr, size_t bytes) {
3803 return munmap(addr, bytes) == 0;
3804 }
3805
3806 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
3807 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
3808 // of a thread.
3809 //
3810 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
3811 // the fast estimate available on the platform.
3812
current_thread_cpu_time()3813 jlong os::current_thread_cpu_time() {
3814 return os::thread_cpu_time(Thread::current(), true /* user + sys */);
3815 }
3816
thread_cpu_time(Thread * thread)3817 jlong os::thread_cpu_time(Thread* thread) {
3818 return os::thread_cpu_time(thread, true /* user + sys */);
3819 }
3820
current_thread_cpu_time(bool user_sys_cpu_time)3821 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
3822 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
3823 }
3824
thread_cpu_time(Thread * thread,bool user_sys_cpu_time)3825 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) {
3826 #ifdef __APPLE__
3827 struct thread_basic_info tinfo;
3828 mach_msg_type_number_t tcount = THREAD_INFO_MAX;
3829 kern_return_t kr;
3830 thread_t mach_thread;
3831
3832 mach_thread = thread->osthread()->thread_id();
3833 kr = thread_info(mach_thread, THREAD_BASIC_INFO, (thread_info_t)&tinfo, &tcount);
3834 if (kr != KERN_SUCCESS) {
3835 return -1;
3836 }
3837
3838 if (user_sys_cpu_time) {
3839 jlong nanos;
3840 nanos = ((jlong) tinfo.system_time.seconds + tinfo.user_time.seconds) * (jlong)1000000000;
3841 nanos += ((jlong) tinfo.system_time.microseconds + (jlong) tinfo.user_time.microseconds) * (jlong)1000;
3842 return nanos;
3843 } else {
3844 return ((jlong)tinfo.user_time.seconds * 1000000000) + ((jlong)tinfo.user_time.microseconds * (jlong)1000);
3845 }
3846 #else
3847 #if defined(__OpenBSD__)
3848 size_t length = 0;
3849 pid_t pid = getpid();
3850 struct kinfo_proc *ki;
3851
3852 int mib[] = { CTL_KERN, KERN_PROC, KERN_PROC_PID|KERN_PROC_SHOW_THREADS, pid, sizeof(struct kinfo_proc), 0 };
3853 const u_int miblen = sizeof(mib) / sizeof(mib[0]);
3854
3855 if (sysctl(mib, miblen, NULL, &length, NULL, 0) < 0) {
3856 return -1;
3857 }
3858
3859 size_t num_threads = length / sizeof(*ki);
3860 ki = NEW_C_HEAP_ARRAY(struct kinfo_proc, num_threads, mtInternal);
3861
3862 mib[5] = num_threads;
3863
3864 if (sysctl(mib, miblen, ki, &length, NULL, 0) < 0) {
3865 FREE_C_HEAP_ARRAY(struct kinfo_proc, ki);
3866 return -1;
3867 }
3868
3869 num_threads = length / sizeof(*ki);
3870
3871 for (size_t i = 0; i < num_threads; i++) {
3872 if (ki[i].p_tid == thread->osthread()->thread_id()) {
3873 jlong nanos = (jlong)ki[i].p_uutime_sec * NANOSECS_PER_SEC;
3874 nanos += (jlong)ki[i].p_uutime_usec * 1000;
3875 if (user_sys_cpu_time) {
3876 nanos += (jlong)ki[i].p_ustime_sec * NANOSECS_PER_SEC;
3877 nanos += (jlong)ki[i].p_ustime_usec * 1000;
3878 }
3879 FREE_C_HEAP_ARRAY(struct kinfo_proc, ki);
3880 return nanos;
3881 }
3882 }
3883 FREE_C_HEAP_ARRAY(struct kinfo_proc, ki);
3884 return -1;
3885 #else /* !OpenBSD */
3886 if (user_sys_cpu_time && Bsd::_getcpuclockid != NULL) {
3887 struct timespec tp;
3888 clockid_t clockid;
3889 int ret;
3890
3891 /*
3892 * XXX This is essentially a copy of the Linux implementation,
3893 * but with fewer indirections.
3894 */
3895 ret = Bsd::_getcpuclockid(thread->osthread()->pthread_id(), &clockid);
3896 if (ret != 0)
3897 return -1;
3898 /* NB: _clock_gettime only needs to be valid for CLOCK_MONOTONIC. */
3899 ret = ::clock_gettime(clockid, &tp);
3900 if (ret != 0)
3901 return -1;
3902 return (tp.tv_sec * NANOSECS_PER_SEC) + tp.tv_nsec;
3903 }
3904 #ifdef RUSAGE_THREAD
3905 if (thread == Thread::current()) {
3906 struct rusage usage;
3907 jlong nanos;
3908
3909 if (getrusage(RUSAGE_THREAD, &usage) != 0)
3910 return -1;
3911 nanos = (jlong)usage.ru_utime.tv_sec * NANOSECS_PER_SEC;
3912 nanos += (jlong)usage.ru_utime.tv_usec * 1000;
3913 if (user_sys_cpu_time) {
3914 nanos += (jlong)usage.ru_stime.tv_sec * NANOSECS_PER_SEC;
3915 nanos += (jlong)usage.ru_stime.tv_usec * 1000;
3916 }
3917 return nanos;
3918 }
3919 #endif
3920 return -1;
3921 #endif
3922 #endif
3923 }
3924
3925
current_thread_cpu_time_info(jvmtiTimerInfo * info_ptr)3926 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
3927 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
3928 info_ptr->may_skip_backward = false; // elapsed time not wall time
3929 info_ptr->may_skip_forward = false; // elapsed time not wall time
3930 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
3931 }
3932
thread_cpu_time_info(jvmtiTimerInfo * info_ptr)3933 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
3934 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
3935 info_ptr->may_skip_backward = false; // elapsed time not wall time
3936 info_ptr->may_skip_forward = false; // elapsed time not wall time
3937 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
3938 }
3939
is_thread_cpu_time_supported()3940 bool os::is_thread_cpu_time_supported() {
3941 #if defined(__APPLE__) || defined(__OpenBSD__)
3942 return true;
3943 #else
3944 return (Bsd::_getcpuclockid != NULL);
3945 #endif
3946 }
3947
3948 // System loadavg support. Returns -1 if load average cannot be obtained.
3949 // Bsd doesn't yet have a (official) notion of processor sets,
3950 // so just return the system wide load average.
loadavg(double loadavg[],int nelem)3951 int os::loadavg(double loadavg[], int nelem) {
3952 return ::getloadavg(loadavg, nelem);
3953 }
3954
pause()3955 void os::pause() {
3956 char filename[MAX_PATH];
3957 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
3958 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
3959 } else {
3960 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
3961 }
3962
3963 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
3964 if (fd != -1) {
3965 struct stat buf;
3966 ::close(fd);
3967 while (::stat(filename, &buf) == 0) {
3968 (void)::poll(NULL, 0, 100);
3969 }
3970 } else {
3971 jio_fprintf(stderr,
3972 "Could not open pause file '%s', continuing immediately.\n", filename);
3973 }
3974 }
3975
3976 // Darwin has no "environ" in a dynamic library.
3977 #ifdef __APPLE__
3978 #include <crt_externs.h>
3979 #define environ (*_NSGetEnviron())
3980 #else
3981 extern char** environ;
3982 #endif
3983
3984 // Run the specified command in a separate process. Return its exit value,
3985 // or -1 on failure (e.g. can't fork a new process).
3986 // Unlike system(), this function can be called from signal handler. It
3987 // doesn't block SIGINT et al.
fork_and_exec(char * cmd,bool use_vfork_if_available)3988 int os::fork_and_exec(char* cmd, bool use_vfork_if_available) {
3989 const char * argv[4] = {"sh", "-c", cmd, NULL};
3990
3991 // fork() in BsdThreads/NPTL is not async-safe. It needs to run
3992 // pthread_atfork handlers and reset pthread library. All we need is a
3993 // separate process to execve. Make a direct syscall to fork process.
3994 // On IA64 there's no fork syscall, we have to use fork() and hope for
3995 // the best...
3996 pid_t pid = fork();
3997
3998 if (pid < 0) {
3999 // fork failed
4000 return -1;
4001
4002 } else if (pid == 0) {
4003 // child process
4004
4005 // execve() in BsdThreads will call pthread_kill_other_threads_np()
4006 // first to kill every thread on the thread list. Because this list is
4007 // not reset by fork() (see notes above), execve() will instead kill
4008 // every thread in the parent process. We know this is the only thread
4009 // in the new process, so make a system call directly.
4010 // IA64 should use normal execve() from glibc to match the glibc fork()
4011 // above.
4012 execve("/bin/sh", (char* const*)argv, environ);
4013
4014 // execve failed
4015 _exit(-1);
4016
4017 } else {
4018 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't
4019 // care about the actual exit code, for now.
4020
4021 int status;
4022
4023 // Wait for the child process to exit. This returns immediately if
4024 // the child has already exited. */
4025 while (waitpid(pid, &status, 0) < 0) {
4026 switch (errno) {
4027 case ECHILD: return 0;
4028 case EINTR: break;
4029 default: return -1;
4030 }
4031 }
4032
4033 if (WIFEXITED(status)) {
4034 // The child exited normally; get its exit code.
4035 return WEXITSTATUS(status);
4036 } else if (WIFSIGNALED(status)) {
4037 // The child exited because of a signal
4038 // The best value to return is 0x80 + signal number,
4039 // because that is what all Unix shells do, and because
4040 // it allows callers to distinguish between process exit and
4041 // process death by signal.
4042 return 0x80 + WTERMSIG(status);
4043 } else {
4044 // Unknown exit code; pass it through
4045 return status;
4046 }
4047 }
4048 }
4049
4050 // Get the default path to the core file
4051 // Returns the length of the string
get_core_path(char * buffer,size_t bufferSize)4052 int os::get_core_path(char* buffer, size_t bufferSize) {
4053 #ifdef __APPLE__
4054 int n = jio_snprintf(buffer, bufferSize, "/cores/core.%d", current_process_id());
4055
4056 // Truncate if theoretical string was longer than bufferSize
4057 n = MIN2(n, (int)bufferSize);
4058
4059 return n;
4060 #else
4061 const char *p = get_current_directory(buffer, bufferSize);
4062
4063 if (p == NULL) {
4064 assert(p != NULL, "failed to get current directory");
4065 return 0;
4066 }
4067
4068 const char *q = getprogname();
4069
4070 if (q == NULL) {
4071 assert(q != NULL, "failed to get progname");
4072 return 0;
4073 }
4074
4075 const int n = strlen(buffer);
4076
4077 jio_snprintf(buffer + n, bufferSize - n, "/%s.core", q);
4078 return strlen(buffer);
4079 #endif
4080 }
4081
4082 #ifndef PRODUCT
TestReserveMemorySpecial_test()4083 void TestReserveMemorySpecial_test() {
4084 // No tests available for this platform
4085 }
4086 #endif
4087
start_debugging(char * buf,int buflen)4088 bool os::start_debugging(char *buf, int buflen) {
4089 int len = (int)strlen(buf);
4090 char *p = &buf[len];
4091
4092 jio_snprintf(p, buflen-len,
4093 "\n\n"
4094 "Do you want to debug the problem?\n\n"
4095 "To debug, run 'gdb /proc/%d/exe %d'; then switch to thread " INTX_FORMAT " (" INTPTR_FORMAT ")\n"
4096 "Enter 'yes' to launch gdb automatically (PATH must include gdb)\n"
4097 "Otherwise, press RETURN to abort...",
4098 os::current_process_id(), os::current_process_id(),
4099 os::current_thread_id(), os::current_thread_id());
4100
4101 bool yes = os::message_box("Unexpected Error", buf);
4102
4103 if (yes) {
4104 // yes, user asked VM to launch debugger
4105 jio_snprintf(buf, sizeof(buf), "gdb /proc/%d/exe %d",
4106 os::current_process_id(), os::current_process_id());
4107
4108 os::fork_and_exec(buf);
4109 yes = false;
4110 }
4111 return yes;
4112 }
4113
4114 // Java thread:
4115 //
4116 // Low memory addresses
4117 // +------------------------+
4118 // | |\ Java thread created by VM does not have
4119 // | pthread guard page | - pthread guard, attached Java thread usually
4120 // | |/ has 1 pthread guard page.
4121 // P1 +------------------------+ Thread::stack_base() - Thread::stack_size()
4122 // | |\
4123 // | HotSpot Guard Pages | - red, yellow and reserved pages
4124 // | |/
4125 // +------------------------+ JavaThread::stack_reserved_zone_base()
4126 // | |\
4127 // | Normal Stack | -
4128 // | |/
4129 // P2 +------------------------+ Thread::stack_base()
4130 //
4131 // Non-Java thread:
4132 //
4133 // Low memory addresses
4134 // +------------------------+
4135 // | |\
4136 // | pthread guard page | - usually 1 page
4137 // | |/
4138 // P1 +------------------------+ Thread::stack_base() - Thread::stack_size()
4139 // | |\
4140 // | Normal Stack | -
4141 // | |/
4142 // P2 +------------------------+ Thread::stack_base()
4143 //
4144 // ** P1 (aka bottom) and size ( P2 = P1 - size) are the address and stack size returned from
4145 // pthread_attr_getstack()
4146
current_stack_region(address * bottom,size_t * size)4147 static void current_stack_region(address * bottom, size_t * size) {
4148 #ifdef __APPLE__
4149 pthread_t self = pthread_self();
4150 void *stacktop = pthread_get_stackaddr_np(self);
4151 *size = pthread_get_stacksize_np(self);
4152 // workaround for OS X 10.9.0 (Mavericks)
4153 // pthread_get_stacksize_np returns 128 pages even though the actual size is 2048 pages
4154 if (pthread_main_np() == 1) {
4155 // At least on Mac OS 10.12 we have observed stack sizes not aligned
4156 // to pages boundaries. This can be provoked by e.g. setrlimit() (ulimit -s xxxx in the
4157 // shell). Apparently Mac OS actually rounds upwards to next multiple of page size,
4158 // however, we round downwards here to be on the safe side.
4159 *size = align_down(*size, getpagesize());
4160
4161 if ((*size) < (DEFAULT_MAIN_THREAD_STACK_PAGES * (size_t)getpagesize())) {
4162 char kern_osrelease[256];
4163 size_t kern_osrelease_size = sizeof(kern_osrelease);
4164 int ret = sysctlbyname("kern.osrelease", kern_osrelease, &kern_osrelease_size, NULL, 0);
4165 if (ret == 0) {
4166 // get the major number, atoi will ignore the minor amd micro portions of the version string
4167 if (atoi(kern_osrelease) >= OS_X_10_9_0_KERNEL_MAJOR_VERSION) {
4168 *size = (DEFAULT_MAIN_THREAD_STACK_PAGES*getpagesize());
4169 }
4170 }
4171 }
4172 }
4173 *bottom = (address) stacktop - *size;
4174 #elif defined(__OpenBSD__)
4175 stack_t ss;
4176 int rslt = pthread_stackseg_np(pthread_self(), &ss);
4177
4178 if (rslt != 0)
4179 fatal("pthread_stackseg_np failed with error = %d", rslt);
4180
4181 *bottom = (address)((char *)ss.ss_sp - ss.ss_size);
4182 *size = ss.ss_size;
4183 #else
4184 pthread_attr_t attr;
4185
4186 int rslt = pthread_attr_init(&attr);
4187
4188 // JVM needs to know exact stack location, abort if it fails
4189 if (rslt != 0)
4190 fatal("pthread_attr_init failed with error = %d", rslt);
4191
4192 rslt = pthread_attr_get_np(pthread_self(), &attr);
4193
4194 if (rslt != 0)
4195 fatal("pthread_attr_get_np failed with error = %d", rslt);
4196
4197 if (pthread_attr_getstack(&attr, (void **)bottom, size) != 0) {
4198 fatal("Can not locate current stack attributes!");
4199 }
4200
4201 pthread_attr_destroy(&attr);
4202 #endif
4203 assert(os::current_stack_pointer() >= *bottom &&
4204 os::current_stack_pointer() < *bottom + *size, "just checking");
4205 }
4206
current_stack_base()4207 address os::current_stack_base() {
4208 address bottom;
4209 size_t size;
4210 current_stack_region(&bottom, &size);
4211 return (bottom + size);
4212 }
4213
current_stack_size()4214 size_t os::current_stack_size() {
4215 // stack size includes normal stack and HotSpot guard pages
4216 address bottom;
4217 size_t size;
4218 current_stack_region(&bottom, &size);
4219 return size;
4220 }
4221