Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301, USA.
- $Id: signal.c 7280 2007-02-03 19:34:10Z twisti $
-
*/
#include "config.h"
+#include <assert.h>
#include <errno.h>
#include <signal.h>
+#include <stdint.h>
#include <stdlib.h>
-#include <unistd.h>
-#include <sys/mman.h>
#if defined(__DARWIN__)
/* If we compile with -ansi on darwin, <sys/types.h> is not
# include <sys/types.h>
#endif
-#include "vm/types.h"
+#include "arch.h"
#include "mm/memory.h"
-#include "native/jni.h"
-#include "native/include/java_lang_Thread.h"
-
-#if defined(WITH_CLASSPATH_GNU)
-# include "native/include/java_lang_VMThread.h"
-#endif
-
#if defined(ENABLE_THREADS)
-# include "threads/native/threads.h"
+# include "threads/threads-common.h"
+#else
+# include "threads/none/threads.h"
#endif
-#include "vm/builtin.h"
+#include "toolbox/logging.h"
+
+#include "vm/exceptions.h"
#include "vm/signallocal.h"
-#include "vm/stringlocal.h"
#include "vm/vm.h"
-#include "vm/jit/stacktrace.h"
-
-#include "vmcore/options.h"
+#include "vm/jit/codegen-common.h"
+#include "vm/jit/disass.h"
+#include "vm/jit/patcher-common.h"
-/* global variables ***********************************************************/
+#include "vmcore/options.h"
-#if defined(ENABLE_THREADS)
-static threadobject *thread_signal;
+#if defined(ENABLE_STATISTICS)
+# include "vmcore/statistics.h"
#endif
*******************************************************************************/
-void signal_init(void)
+bool signal_init(void)
{
#if !defined(__CYGWIN__)
- int pagesize;
- sigset_t mask;
- struct sigaction act;
-
- /* mmap a memory page at address 0x0, so our hardware-exceptions
- work. */
-
- pagesize = getpagesize();
+ sigset_t mask;
- (void) memory_mmap_anon(NULL, pagesize, PROT_NONE, MAP_PRIVATE | MAP_FIXED);
+#if defined(__LINUX__) && defined(ENABLE_THREADS)
+ /* XXX Remove for exact-GC. */
+ if (threads_pthreads_implementation_nptl) {
+#endif
-#if 0
/* Block the following signals (SIGINT for <ctrl>-c, SIGQUIT for
<ctrl>-\). We enable them later in signal_thread, but only for
this thread. */
if (sigemptyset(&mask) != 0)
vm_abort("signal_init: sigemptyset failed: %s", strerror(errno));
+#if !defined(WITH_CLASSPATH_SUN)
+ /* Let OpenJDK handle SIGINT itself. */
+
if (sigaddset(&mask, SIGINT) != 0)
vm_abort("signal_init: sigaddset failed: %s", strerror(errno));
+#endif
#if !defined(__FREEBSD__)
if (sigaddset(&mask, SIGQUIT) != 0)
if (sigprocmask(SIG_BLOCK, &mask, NULL) != 0)
vm_abort("signal_init: sigprocmask failed: %s", strerror(errno));
+
+#if defined(__LINUX__) && defined(ENABLE_THREADS)
+ /* XXX Remove for exact-GC. */
+ }
#endif
#if defined(ENABLE_GC_BOEHM)
/* Allocate something so the garbage collector's signal handlers
are installed. */
- (void) GCNEW(u1);
+ (void) GCNEW(int);
#endif
/* Install signal handlers for signals we want to catch in all
threads. */
- sigemptyset(&act.sa_mask);
-
#if defined(ENABLE_JIT)
# if defined(ENABLE_INTRP)
if (!opt_intrp) {
# endif
/* SIGSEGV handler */
- act.sa_sigaction = md_signal_handler_sigsegv;
- act.sa_flags = SA_NODEFER | SA_SIGINFO;
+ signal_register_signal(SIGSEGV, (functionptr) md_signal_handler_sigsegv,
+ SA_NODEFER | SA_SIGINFO);
-#if defined(SIGSEGV)
- sigaction(SIGSEGV, &act, NULL);
-#endif
-
-#if defined(SIGBUS)
- sigaction(SIGBUS, &act, NULL);
-#endif
+# if defined(SIGBUS)
+ signal_register_signal(SIGBUS, (functionptr) md_signal_handler_sigsegv,
+ SA_NODEFER | SA_SIGINFO);
+# endif
-#if SUPPORT_HARDWARE_DIVIDE_BY_ZERO
+# if SUPPORT_HARDWARE_DIVIDE_BY_ZERO
/* SIGFPE handler */
- act.sa_sigaction = md_signal_handler_sigfpe;
- act.sa_flags = SA_NODEFER | SA_SIGINFO;
- sigaction(SIGFPE, &act, NULL);
-#endif
+ signal_register_signal(SIGFPE, (functionptr) md_signal_handler_sigfpe,
+ SA_NODEFER | SA_SIGINFO);
+# endif
+
+# if defined(__ARM__) || defined(__S390__)
+ /* XXX use better defines for that (in arch.h) */
+ /* SIGILL handler */
+
+ signal_register_signal(SIGILL, (functionptr) md_signal_handler_sigill,
+ SA_NODEFER | SA_SIGINFO);
+# endif
+
+# if defined(__POWERPC__)
+ /* XXX use better defines for that (in arch.h) */
+ /* SIGTRAP handler */
+
+ signal_register_signal(SIGTRAP, (functionptr) md_signal_handler_sigtrap,
+ SA_NODEFER | SA_SIGINFO);
+# endif
# if defined(ENABLE_INTRP)
}
# endif
#if defined(ENABLE_THREADS)
/* SIGHUP handler for threads_thread_interrupt */
- act.sa_sigaction = signal_handler_sighup;
- act.sa_flags = 0;
- sigaction(SIGHUP, &act, NULL);
+ signal_register_signal(SIGHUP, (functionptr) signal_handler_sighup, 0);
#endif
#if defined(ENABLE_THREADS) && defined(ENABLE_PROFILING)
/* SIGUSR2 handler for profiling sampling */
- act.sa_sigaction = md_signal_handler_sigusr2;
- act.sa_flags = SA_SIGINFO;
- sigaction(SIGUSR2, &act, NULL);
+ signal_register_signal(SIGUSR2, (functionptr) md_signal_handler_sigusr2,
+ SA_SIGINFO);
#endif
#endif /* !defined(__CYGWIN__) */
+
+ return true;
+}
+
+
+/* signal_register_signal ******************************************************
+
+ Register the specified handler with the specified signal.
+
+*******************************************************************************/
+
+void signal_register_signal(int signum, functionptr handler, int flags)
+{
+ struct sigaction act;
+
+ void (*function)(int, siginfo_t *, void *);
+
+ function = (void (*)(int, siginfo_t *, void *)) handler;
+
+ if (sigemptyset(&act.sa_mask) != 0)
+ vm_abort("signal_register_signal: sigemptyset failed: %s",
+ strerror(errno));
+
+ act.sa_sigaction = function;
+ act.sa_flags = flags;
+
+ if (sigaction(signum, &act, NULL) != 0)
+ vm_abort("signal_register_signal: sigaction failed: %s",
+ strerror(errno));
+}
+
+
+/* signal_handle ***************************************************************
+
+ Handles the signal caught by a signal handler and calls the correct
+ function.
+
+*******************************************************************************/
+
+void *signal_handle(void *xpc, int type, intptr_t val)
+{
+ void *p;
+ int32_t index;
+ java_object_t *o;
+
+ switch (type) {
+ case EXCEPTION_HARDWARE_NULLPOINTER:
+ p = exceptions_new_nullpointerexception();
+ break;
+
+ case EXCEPTION_HARDWARE_ARITHMETIC:
+ p = exceptions_new_arithmeticexception();
+ break;
+
+ case EXCEPTION_HARDWARE_ARRAYINDEXOUTOFBOUNDS:
+ index = (s4) val;
+ p = exceptions_new_arrayindexoutofboundsexception(index);
+ break;
+
+ case EXCEPTION_HARDWARE_CLASSCAST:
+ o = (java_object_t *) val;
+ p = exceptions_new_classcastexception(o);
+ break;
+
+ case EXCEPTION_HARDWARE_EXCEPTION:
+ p = exceptions_fillinstacktrace();
+ break;
+
+ case EXCEPTION_HARDWARE_PATCHER:
+#if defined(ENABLE_REPLACEMENT)
+ if (replace_me_wrapper(xpc)) {
+ p = NULL;
+ break;
+ }
+#endif
+ p = patcher_handler(xpc);
+ break;
+
+ default:
+ /* Let's try to get a backtrace. */
+
+ codegen_get_pv_from_pc(xpc);
+
+ /* If that does not work, print more debug info. */
+
+ log_println("exceptions_new_hardware_exception: unknown exception type %d", type);
+
+#if SIZEOF_VOID_P == 8
+ log_println("PC=0x%016lx", xpc);
+#else
+ log_println("PC=0x%08x", xpc);
+#endif
+
+#if defined(ENABLE_DISASSEMBLER)
+ log_println("machine instruction at PC:");
+ disassinstr(xpc);
+#endif
+
+ vm_abort("Exiting...");
+
+ /* keep compiler happy */
+
+ p = NULL;
+ }
+
+ return p;
}
This thread sets the signal mask to catch the user input signals
(SIGINT, SIGQUIT). We use such a thread, so we don't get the
- signals on every single thread running. Especially, this makes
- problems on slow machines.
+ signals on every single thread running.
*******************************************************************************/
static void signal_thread(void)
{
- sigset_t mask;
- int sig;
+ threadobject *t;
+ sigset_t mask;
+ int sig;
+
+ t = THREADOBJECT;
+
+ if (sigemptyset(&mask) != 0)
+ vm_abort("signal_thread: sigemptyset failed: %s", strerror(errno));
+
+#if !defined(WITH_CLASSPATH_SUN)
+ /* Let OpenJDK handle SIGINT itself. */
+
+ if (sigaddset(&mask, SIGINT) != 0)
+ vm_abort("signal_thread: sigaddset failed: %s", strerror(errno));
+#endif
- sigemptyset(&mask);
- sigaddset(&mask, SIGINT);
#if !defined(__FREEBSD__)
- sigaddset(&mask, SIGQUIT);
+ if (sigaddset(&mask, SIGQUIT) != 0)
+ vm_abort("signal_thread: sigaddset failed: %s", strerror(errno));
#endif
- while (true) {
+ for (;;) {
/* just wait for a signal */
- sigwait(&mask, &sig);
- log_println("signal caught: %d", sig);
-
- switch (sig) {
- case SIGINT:
- /* exit the vm properly */
-
- vm_exit(0);
- break;
+#if defined(ENABLE_THREADS)
+ threads_thread_state_waiting(t);
+#endif
- case SIGQUIT:
- /* print a thread dump */
+ /* XXX We don't check for an error here, although the man-page
+ states sigwait does not return an error (which is wrong!),
+ but it seems to make problems with Boehm-GC. We should
+ revisit this code with our new exact-GC. */
- threads_dump();
+/* if (sigwait(&mask, &sig) != 0) */
+/* vm_abort("signal_thread: sigwait failed: %s", strerror(errno)); */
+ (void) sigwait(&mask, &sig);
-#if defined(ENABLE_STATISTICS)
- if (opt_stat)
- statistics_print_memory_usage();
+#if defined(ENABLE_THREADS)
+ threads_thread_state_runnable(t);
#endif
- break;
- }
- }
- /* this should not happen */
+ /* Handle the signal. */
- vm_abort("signal_thread: this thread should not exit!");
+ signal_thread_handler(sig);
+ }
}
-/* signal_start_thread *********************************************************
+/* signal_thread_handler *******************************************************
- Starts the signal handler thread.
+ Handles the signals caught in the signal handler thread. Also used
+ from sun.misc.Signal with OpenJDK.
*******************************************************************************/
-bool signal_start_thread(void)
+void signal_thread_handler(int sig)
{
-#if defined(ENABLE_THREADS)
-#if defined(WITH_CLASSPATH_GNU)
- java_lang_VMThread *vmt;
-#endif
+ switch (sig) {
+ case SIGINT:
+ /* exit the vm properly */
- /* create the finalizer object */
+ vm_exit(0);
+ break;
- thread_signal = (threadobject *) builtin_new(class_java_lang_Thread);
+ case SIGQUIT:
+ /* print a thread dump */
+#if defined(ENABLE_THREADS)
+ threads_dump();
+#endif
- if (thread_signal == NULL)
- return false;
+#if defined(ENABLE_STATISTICS)
+ if (opt_stat)
+ statistics_print_memory_usage();
+#endif
+ break;
+ }
+}
-#if defined(WITH_CLASSPATH_GNU)
- vmt = (java_lang_VMThread *) builtin_new(class_java_lang_VMThread);
- vmt->thread = (java_lang_Thread *) thread_signal;
+/* signal_start_thread *********************************************************
- thread_signal->o.vmThread = vmt;
-#endif
+ Starts the signal handler thread.
- thread_signal->flags = THREAD_FLAG_DAEMON;
+*******************************************************************************/
- thread_signal->o.name = javastring_new_from_ascii("Signal Handler");
-#if defined(ENABLE_JAVASE)
- thread_signal->o.daemon = true;
-#endif
- thread_signal->o.priority = 5;
+bool signal_start_thread(void)
+{
+#if defined(ENABLE_THREADS)
+ utf *name;
- /* actually start the finalizer thread */
+ name = utf_new_char("Signal Handler");
- threads_start_thread(thread_signal, signal_thread);
+ if (!threads_thread_start_internal(name, signal_thread))
+ return false;
/* everything's ok */
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