1 /* src/vm/signal.c - machine independent signal functions
3 Copyright (C) 1996-2005, 2006, 2007, 2008
4 CACAOVM - Verein zur Foerderung der freien virtuellen Maschine CACAO
6 This file is part of CACAO.
8 This program is free software; you can redistribute it and/or
9 modify it under the terms of the GNU General Public License as
10 published by the Free Software Foundation; either version 2, or (at
11 your option) any later version.
13 This program is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
33 #if defined(__DARWIN__)
34 /* If we compile with -ansi on darwin, <sys/types.h> is not
35 included. So let's do it here. */
36 # include <sys/types.h>
37 # include <sys/utsname.h>
42 #if defined(ENABLE_GC_BOEHM)
43 # include "mm/memory.hpp"
46 #include "threads/thread.hpp"
47 #include "threads/threadlist.hpp"
49 #include "vm/exceptions.hpp"
50 #include "vm/globals.hpp"
51 #include "vm/method.hpp"
52 #include "vm/options.h"
54 #include "vm/signallocal.hpp"
57 #if defined(ENABLE_STATISTICS)
58 # include "vm/statistics.h"
62 /* function prototypes ********************************************************/
64 void signal_handler_sighup(int sig, siginfo_t *siginfo, void *_p);
65 void signal_handler_sigusr1(int sig, siginfo_t *siginfo, void *_p);
68 /* signal_init *****************************************************************
70 Initializes the signal subsystem and installs the signal handler.
72 *******************************************************************************/
74 bool signal_init(void)
76 #if !defined(__CYGWIN__)
79 TRACESUBSYSTEMINITIALIZATION("signal_init");
81 #if defined(__LINUX__) && defined(ENABLE_THREADS)
82 /* XXX Remove for exact-GC. */
83 if (threads_pthreads_implementation_nptl) {
86 /* Block the following signals (SIGINT for <ctrl>-c, SIGQUIT for
87 <ctrl>-\). We enable them later in signal_thread, but only for
90 if (sigemptyset(&mask) != 0)
91 os::abort_errno("signal_init: sigemptyset failed");
93 #if !defined(WITH_JAVA_RUNTIME_LIBRARY_OPENJDK)
94 /* Let OpenJDK handle SIGINT itself. */
96 if (sigaddset(&mask, SIGINT) != 0)
97 os::abort_errno("signal_init: sigaddset failed");
100 #if !defined(__FREEBSD__)
101 if (sigaddset(&mask, SIGQUIT) != 0)
102 os::abort_errno("signal_init: sigaddset failed");
105 if (sigprocmask(SIG_BLOCK, &mask, NULL) != 0)
106 os::abort_errno("signal_init: sigprocmask failed");
108 #if defined(__LINUX__) && defined(ENABLE_THREADS)
109 /* XXX Remove for exact-GC. */
113 #if defined(ENABLE_GC_BOEHM)
114 /* Allocate something so the garbage collector's signal handlers
120 /* Install signal handlers for signals we want to catch in all
123 #if defined(ENABLE_JIT)
124 # if defined(ENABLE_INTRP)
127 /* SIGSEGV handler */
129 signal_register_signal(SIGSEGV, (functionptr) md_signal_handler_sigsegv,
130 SA_NODEFER | SA_SIGINFO);
133 signal_register_signal(SIGBUS, (functionptr) md_signal_handler_sigsegv,
134 SA_NODEFER | SA_SIGINFO);
137 # if SUPPORT_HARDWARE_DIVIDE_BY_ZERO
140 signal_register_signal(SIGFPE, (functionptr) md_signal_handler_sigfpe,
141 SA_NODEFER | SA_SIGINFO);
144 # if defined(__ALPHA__) || defined(__ARM__) || defined(__I386__) || defined(__MIPS__) || defined(__POWERPC__) || defined(__POWERPC64__) || defined(__S390__) || defined(__X86_64__) || defined(__M68K__)
145 /* XXX use better defines for that (in arch.h) */
148 signal_register_signal(SIGILL, (functionptr) md_signal_handler_sigill,
149 SA_NODEFER | SA_SIGINFO);
152 # if defined(__POWERPC__)
153 /* XXX use better defines for that (in arch.h) */
154 /* SIGTRAP handler */
156 signal_register_signal(SIGTRAP, (functionptr) md_signal_handler_sigtrap,
157 SA_NODEFER | SA_SIGINFO);
159 # if defined(ENABLE_INTRP)
163 #if defined(__DARWIN__)
168 /* Check if we're on 10.4 (Tiger/8.x) or earlier */
169 if (uname(&name) != 0)
172 /* Make sure the string is large enough */
173 /* Check the major number (ascii comparison) */
174 /* Verify that we're not looking at '10.' by checking for a trailing period. */
175 if (name.release[0] == '\0' || name.release[0] > '8' || name.release[1] != '.')
178 /* Reset CrashReporter's task signal handler */
179 kr = task_set_exception_ports(mach_task_self(),
181 # if defined(__I386__)
182 | EXC_MASK_BAD_INSTRUCTION
185 EXCEPTION_STATE_IDENTITY,
186 MACHINE_THREAD_STATE);
188 assert(kr == KERN_SUCCESS);
191 #endif /* !defined(ENABLE_JIT) */
193 #if defined(ENABLE_THREADS)
194 /* SIGHUP handler for threads_thread_interrupt */
196 signal_register_signal(Signal_INTERRUPT_SYSTEM_CALL, (functionptr) signal_handler_sighup, 0);
199 #if defined(ENABLE_THREADS)
200 /* SIGUSR1 handler for thread suspension */
202 signal_register_signal(SIGUSR1, (functionptr) signal_handler_sigusr1,
206 #if defined(ENABLE_THREADS) && defined(ENABLE_PROFILING)
207 /* SIGUSR2 handler for profiling sampling */
209 signal_register_signal(SIGUSR2, (functionptr) md_signal_handler_sigusr2,
213 #endif /* !defined(__CYGWIN__) */
219 /* signal_register_signal ******************************************************
221 Register the specified handler with the specified signal.
223 *******************************************************************************/
225 void signal_register_signal(int signum, functionptr handler, int flags)
227 struct sigaction act;
229 void (*function)(int, siginfo_t *, void *);
231 function = (void (*)(int, siginfo_t *, void *)) handler;
233 if (sigemptyset(&act.sa_mask) != 0)
234 os::abort_errno("signal_register_signal: sigemptyset failed");
236 act.sa_sigaction = function;
237 act.sa_flags = flags;
239 if (sigaction(signum, &act, NULL) != 0)
240 os::abort_errno("signal_register_signal: sigaction failed");
244 /* signal_thread ************************************************************
246 This thread sets the signal mask to catch the user input signals
247 (SIGINT, SIGQUIT). We use such a thread, so we don't get the
248 signals on every single thread running.
250 *******************************************************************************/
252 static void signal_thread(void)
261 if (sigemptyset(&mask) != 0)
262 os::abort_errno("signal_thread: sigemptyset failed");
264 #if !defined(WITH_JAVA_RUNTIME_LIBRARY_OPENJDK)
265 /* Let OpenJDK handle SIGINT itself. */
267 if (sigaddset(&mask, SIGINT) != 0)
268 os::abort_errno("signal_thread: sigaddset failed");
271 #if !defined(__FREEBSD__)
272 if (sigaddset(&mask, SIGQUIT) != 0)
273 os::abort_errno("signal_thread: sigaddset failed");
277 /* just wait for a signal */
279 #if defined(ENABLE_THREADS)
280 thread_set_state_waiting(t);
283 // sigwait can return EINTR (unlike what the Linux man-page
286 result = sigwait(&mask, &sig);
287 } while (result == EINTR);
290 os::abort_errnum(result, "signal_thread: sigwait failed");
292 #if defined(ENABLE_THREADS)
293 thread_set_state_runnable(t);
296 /* Handle the signal. */
298 signal_thread_handler(sig);
303 /* signal_thread_handler *******************************************************
305 Handles the signals caught in the signal handler thread. Also used
306 from sun.misc.Signal with OpenJDK.
308 *******************************************************************************/
310 void signal_thread_handler(int sig)
314 /* exit the vm properly */
320 /* print a thread dump */
321 #if defined(ENABLE_THREADS)
322 ThreadList::dump_threads();
325 #if defined(ENABLE_STATISTICS)
327 statistics_print_memory_usage();
331 #if defined(WITH_JAVA_RUNTIME_LIBRARY_OPENJDK)
333 // For OpenJDK we dispatch all unknown signals to Java.
334 methodinfo* m = class_resolvemethod(class_sun_misc_Signal, utf_dispatch, utf_int__void);
335 (void) vm_call_method(m, NULL, sig);
337 if (exceptions_get_exception()) {
338 log_println("signal_thread_handler: Java signal handler throw an exception while dispatching signal %d:", sig);
339 exceptions_print_stacktrace();
340 vm_abort("signal_thread_handler: Aborting...");
346 vm_abort("signal_thread_handler: Unknown signal %d", sig);
352 /* signal_start_thread *********************************************************
354 Starts the signal handler thread.
356 *******************************************************************************/
358 bool signal_start_thread(void)
360 #if defined(ENABLE_THREADS)
363 name = utf_new_char("Signal Handler");
365 if (!threads_thread_start_internal(name, signal_thread))
368 /* everything's ok */
377 /* signal_handler_sighup *******************************************************
379 This handler is required by threads_thread_interrupt and does
382 *******************************************************************************/
384 #if defined(ENABLE_THREADS)
385 void signal_handler_sighup(int sig, siginfo_t *siginfo, void *_p)
392 /* signal_handler_sigusr1 ******************************************************
394 Signal handler for suspending threads.
396 *******************************************************************************/
398 #if defined(ENABLE_THREADS)
399 void signal_handler_sigusr1(int sig, siginfo_t *siginfo, void *_p)
401 // Really suspend ourselves by acknowledging the suspension.
402 threads_suspend_ack();
408 * These are local overrides for various environment variables in Emacs.
409 * Please do not remove this and leave it at the end of the file, where
410 * Emacs will automagically detect them.
411 * ---------------------------------------------------------------------
414 * indent-tabs-mode: t