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mini-posix.c
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mini-posix.c
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/*
* mini-posix.c: POSIX signal handling support for Mono.
*
* Authors:
* Mono Team (mono-list@lists.ximian.com)
*
* Copyright 2001-2003 Ximian, Inc.
* Copyright 2003-2008 Ximian, Inc.
* Copyright 2011 Xamarin, Inc (http://www.xamarin.com)
*
* See LICENSE for licensing information.
*/
#include <config.h>
#include <signal.h>
#ifdef HAVE_ALLOCA_H
#include <alloca.h>
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <math.h>
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#endif
#ifdef HAVE_SYS_SYSCALL_H
#include <sys/syscall.h>
#endif
#include <mono/metadata/assembly.h>
#include <mono/metadata/loader.h>
#include <mono/metadata/tabledefs.h>
#include <mono/metadata/class.h>
#include <mono/metadata/object.h>
#include <mono/metadata/tokentype.h>
#include <mono/metadata/tabledefs.h>
#include <mono/metadata/threads.h>
#include <mono/metadata/appdomain.h>
#include <mono/metadata/debug-helpers.h>
#include <mono/io-layer/io-layer.h>
#include "mono/metadata/profiler.h"
#include <mono/metadata/profiler-private.h>
#include <mono/metadata/mono-config.h>
#include <mono/metadata/environment.h>
#include <mono/metadata/mono-debug.h>
#include <mono/metadata/gc-internal.h>
#include <mono/metadata/threads-types.h>
#include <mono/metadata/verify.h>
#include <mono/metadata/verify-internals.h>
#include <mono/metadata/mempool-internals.h>
#include <mono/metadata/attach.h>
#include <mono/utils/mono-math.h>
#include <mono/utils/mono-compiler.h>
#include <mono/utils/mono-counters.h>
#include <mono/utils/mono-logger-internal.h>
#include <mono/utils/mono-mmap.h>
#include <mono/utils/dtrace.h>
#include "mini.h"
#include <string.h>
#include <ctype.h>
#include "trace.h"
#include "version.h"
#include "debugger-agent.h"
#include "jit-icalls.h"
#if defined(__native_client__)
void
mono_runtime_setup_stat_profiler (void)
{
printf("WARNING: mono_runtime_setup_stat_profiler() called!\n");
}
void
mono_runtime_shutdown_stat_profiler (void)
{
}
gboolean
SIG_HANDLER_SIGNATURE (mono_chain_signal)
{
return FALSE;
}
void
mono_runtime_install_handlers (void)
{
}
void
mono_runtime_shutdown_handlers (void)
{
}
void
mono_runtime_cleanup_handlers (void)
{
}
pid_t
mono_runtime_syscall_fork (void)
{
g_assert_not_reached();
return 0;
}
void
mono_gdb_render_native_backtraces (pid_t crashed_pid)
{
return FALSE;
}
#else
static GHashTable *mono_saved_signal_handlers = NULL;
static gpointer
get_saved_signal_handler (int signo)
{
if (mono_saved_signal_handlers)
/* The hash is only modified during startup, so no need for locking */
return g_hash_table_lookup (mono_saved_signal_handlers, GINT_TO_POINTER (signo));
return NULL;
}
static void
save_old_signal_handler (int signo, struct sigaction *old_action)
{
struct sigaction *handler_to_save = g_malloc (sizeof (struct sigaction));
mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_CONFIG,
"Saving old signal handler for signal %d.", signo);
if (! (old_action->sa_flags & SA_SIGINFO)) {
handler_to_save->sa_handler = old_action->sa_handler;
} else {
#ifdef MONO_ARCH_USE_SIGACTION
handler_to_save->sa_sigaction = old_action->sa_sigaction;
#endif /* MONO_ARCH_USE_SIGACTION */
}
handler_to_save->sa_mask = old_action->sa_mask;
handler_to_save->sa_flags = old_action->sa_flags;
if (!mono_saved_signal_handlers)
mono_saved_signal_handlers = g_hash_table_new (NULL, NULL);
g_hash_table_insert (mono_saved_signal_handlers, GINT_TO_POINTER (signo), handler_to_save);
}
static void
free_saved_sig_handler_func (gpointer key, gpointer value, gpointer user_data)
{
g_free (value);
}
static void
free_saved_signal_handlers (void)
{
if (mono_saved_signal_handlers) {
g_hash_table_foreach (mono_saved_signal_handlers, free_saved_sig_handler_func, NULL);
g_hash_table_destroy (mono_saved_signal_handlers);
mono_saved_signal_handlers = NULL;
}
}
/*
* mono_chain_signal:
*
* Call the original signal handler for the signal given by the arguments, which
* should be the same as for a signal handler. Returns TRUE if the original handler
* was called, false otherwise.
*/
gboolean
SIG_HANDLER_SIGNATURE (mono_chain_signal)
{
int signal = _dummy;
struct sigaction *saved_handler = get_saved_signal_handler (signal);
GET_CONTEXT;
if (saved_handler && saved_handler->sa_handler) {
if (!(saved_handler->sa_flags & SA_SIGINFO)) {
saved_handler->sa_handler (signal);
} else {
#ifdef MONO_ARCH_USE_SIGACTION
saved_handler->sa_sigaction (signal, info, ctx);
#endif /* MONO_ARCH_USE_SIGACTION */
}
return TRUE;
}
return FALSE;
}
static void
SIG_HANDLER_SIGNATURE (sigabrt_signal_handler)
{
MonoJitInfo *ji = NULL;
GET_CONTEXT;
if (mono_thread_internal_current ())
ji = mono_jit_info_table_find (mono_domain_get (), mono_arch_ip_from_context(ctx));
if (!ji) {
if (mono_chain_signal (SIG_HANDLER_PARAMS))
return;
mono_handle_native_sigsegv (SIGABRT, ctx);
}
}
static void
SIG_HANDLER_SIGNATURE (sigusr1_signal_handler)
{
gboolean running_managed;
MonoException *exc;
MonoInternalThread *thread = mono_thread_internal_current ();
MonoDomain *domain = mono_domain_get ();
void *ji;
GET_CONTEXT;
if (!thread || !domain) {
/* The thread might not have started up yet */
/* FIXME: Specify the synchronization with start_wrapper () in threads.c */
mono_debugger_agent_thread_interrupt (ctx, NULL);
return;
}
if (thread->ignore_next_signal) {
thread->ignore_next_signal = FALSE;
return;
}
if (thread->thread_dump_requested) {
thread->thread_dump_requested = FALSE;
mono_print_thread_dump (ctx);
}
/*
* This is an async signal, so the code below must not call anything which
* is not async safe. That includes the pthread locking functions. If we
* know that we interrupted managed code, then locking is safe.
*/
/*
* On OpenBSD, ctx can be NULL if we are interrupting poll ().
*/
if (ctx) {
ji = mono_jit_info_table_find (mono_domain_get (), mono_arch_ip_from_context(ctx));
running_managed = ji != NULL;
if (mono_debugger_agent_thread_interrupt (ctx, ji))
return;
} else {
running_managed = FALSE;
}
/* We can't do handler block checking from metadata since it requires doing
* a stack walk with context.
*
* FIXME add full-aot support.
*/
#ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
if (!mono_aot_only && ctx) {
MonoThreadUnwindState unwind_state;
if (mono_thread_state_init_from_sigctx (&unwind_state, ctx)) {
if (mono_install_handler_block_guard (&unwind_state)) {
#ifndef HOST_WIN32
/*Clear current thread from been wapi interrupted otherwise things can go south*/
wapi_clear_interruption ();
#endif
return;
}
}
}
#endif
exc = mono_thread_request_interruption (running_managed);
if (!exc)
return;
mono_arch_handle_exception (ctx, exc);
}
#if defined(__i386__) || defined(__x86_64__)
#define FULL_STAT_PROFILER_BACKTRACE 1
#define CURRENT_FRAME_GET_BASE_POINTER(f) (* (gpointer*)(f))
#define CURRENT_FRAME_GET_RETURN_ADDRESS(f) (* (((gpointer*)(f)) + 1))
#if MONO_ARCH_STACK_GROWS_UP
#define IS_BEFORE_ON_STACK <
#define IS_AFTER_ON_STACK >
#else
#define IS_BEFORE_ON_STACK >
#define IS_AFTER_ON_STACK <
#endif
#else
#define FULL_STAT_PROFILER_BACKTRACE 0
#endif
#if defined(__ia64__) || defined(__sparc__) || defined(sparc) || defined(__s390__) || defined(s390)
static void
SIG_HANDLER_SIGNATURE (sigprof_signal_handler)
{
if (mono_chain_signal (SIG_HANDLER_PARAMS))
return;
NOT_IMPLEMENTED;
}
#else
static void
SIG_HANDLER_SIGNATURE (sigprof_signal_handler)
{
int call_chain_depth = mono_profiler_stat_get_call_chain_depth ();
MonoProfilerCallChainStrategy call_chain_strategy = mono_profiler_stat_get_call_chain_strategy ();
GET_CONTEXT;
if (call_chain_depth == 0) {
mono_profiler_stat_hit (mono_arch_ip_from_context (ctx), ctx);
} else {
MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
int current_frame_index = 1;
MonoContext mono_context;
guchar *ips [call_chain_depth + 1];
mono_arch_sigctx_to_monoctx (ctx, &mono_context);
ips [0] = MONO_CONTEXT_GET_IP (&mono_context);
if (jit_tls != NULL) {
if (call_chain_strategy == MONO_PROFILER_CALL_CHAIN_NATIVE) {
#if FULL_STAT_PROFILER_BACKTRACE
guchar *current_frame;
guchar *stack_bottom;
guchar *stack_top;
stack_bottom = jit_tls->end_of_stack;
stack_top = MONO_CONTEXT_GET_SP (&mono_context);
current_frame = MONO_CONTEXT_GET_BP (&mono_context);
while ((current_frame_index <= call_chain_depth) &&
(stack_bottom IS_BEFORE_ON_STACK (guchar*) current_frame) &&
((guchar*) current_frame IS_BEFORE_ON_STACK stack_top)) {
ips [current_frame_index] = CURRENT_FRAME_GET_RETURN_ADDRESS (current_frame);
current_frame_index ++;
stack_top = current_frame;
current_frame = CURRENT_FRAME_GET_BASE_POINTER (current_frame);
}
#else
call_chain_strategy = MONO_PROFILER_CALL_CHAIN_GLIBC;
#endif
}
if (call_chain_strategy == MONO_PROFILER_CALL_CHAIN_GLIBC) {
#if GLIBC_PROFILER_BACKTRACE
current_frame_index = backtrace ((void**) & ips [1], call_chain_depth);
#else
call_chain_strategy = MONO_PROFILER_CALL_CHAIN_MANAGED;
#endif
}
if (call_chain_strategy == MONO_PROFILER_CALL_CHAIN_MANAGED) {
MonoDomain *domain = mono_domain_get ();
if (domain != NULL) {
MonoLMF *lmf = NULL;
MonoJitInfo *ji;
MonoJitInfo res;
MonoContext new_mono_context;
int native_offset;
ji = mono_find_jit_info (domain, jit_tls, &res, NULL, &mono_context,
&new_mono_context, NULL, &lmf, &native_offset, NULL);
while ((ji != NULL) && (current_frame_index <= call_chain_depth)) {
ips [current_frame_index] = MONO_CONTEXT_GET_IP (&new_mono_context);
current_frame_index ++;
mono_context = new_mono_context;
ji = mono_find_jit_info (domain, jit_tls, &res, NULL, &mono_context,
&new_mono_context, NULL, &lmf, &native_offset, NULL);
}
}
}
}
mono_profiler_stat_call_chain (current_frame_index, & ips [0], ctx);
}
mono_chain_signal (SIG_HANDLER_PARAMS);
}
#endif
static void
SIG_HANDLER_SIGNATURE (sigquit_signal_handler)
{
gboolean res;
GET_CONTEXT;
/* We use this signal to start the attach agent too */
res = mono_attach_start ();
if (res)
return;
if (mono_thread_info_new_interrupt_enabled ()) {
mono_threads_request_thread_dump ();
} else {
printf ("Full thread dump:\n");
mono_threads_request_thread_dump ();
/*
* print_thread_dump () skips the current thread, since sending a signal
* to it would invoke the signal handler below the sigquit signal handler,
* and signal handlers don't create an lmf, so the stack walk could not
* be performed.
*/
mono_print_thread_dump (ctx);
}
mono_chain_signal (SIG_HANDLER_PARAMS);
}
static void
SIG_HANDLER_SIGNATURE (sigusr2_signal_handler)
{
gboolean enabled = mono_trace_is_enabled ();
mono_trace_enable (!enabled);
mono_chain_signal (SIG_HANDLER_PARAMS);
}
static void
add_signal_handler (int signo, gpointer handler)
{
struct sigaction sa;
struct sigaction previous_sa;
#ifdef MONO_ARCH_USE_SIGACTION
sa.sa_sigaction = handler;
sigemptyset (&sa.sa_mask);
sa.sa_flags = SA_SIGINFO;
#ifdef MONO_ARCH_SIGSEGV_ON_ALTSTACK
/*Apple likes to deliver SIGBUS for *0 */
#ifdef __APPLE__
if (signo == SIGSEGV || signo == SIGBUS) {
#else
if (signo == SIGSEGV) {
#endif
sa.sa_flags |= SA_ONSTACK;
/*
* libgc will crash when trying to do stack marking for threads which are on
* an altstack, so delay the suspend signal after the signal handler has
* executed.
*/
if (mono_gc_get_suspend_signal () != -1)
sigaddset (&sa.sa_mask, mono_gc_get_suspend_signal ());
}
#endif
if (signo == SIGSEGV) {
/*
* Delay abort signals while handling SIGSEGVs since they could go unnoticed.
*/
sigset_t block_mask;
sigemptyset (&block_mask);
sigaddset (&sa.sa_mask, mono_thread_get_abort_signal ());
}
#else
sa.sa_handler = handler;
sigemptyset (&sa.sa_mask);
sa.sa_flags = 0;
#endif
g_assert (sigaction (signo, &sa, &previous_sa) != -1);
/* if there was already a handler in place for this signal, store it */
if (! (previous_sa.sa_flags & SA_SIGINFO) &&
(SIG_DFL == previous_sa.sa_handler)) {
/* it there is no sa_sigaction function and the sa_handler is default, we can safely ignore this */
} else {
if (mono_do_signal_chaining)
save_old_signal_handler (signo, &previous_sa);
}
}
static void
remove_signal_handler (int signo)
{
struct sigaction sa;
struct sigaction *saved_action = get_saved_signal_handler (signo);
if (!saved_action) {
sa.sa_handler = SIG_DFL;
sigemptyset (&sa.sa_mask);
sa.sa_flags = 0;
sigaction (signo, &sa, NULL);
} else {
g_assert (sigaction (signo, saved_action, NULL) != -1);
}
}
void
mono_runtime_posix_install_handlers (void)
{
sigset_t signal_set;
if (mini_get_debug_options ()->handle_sigint)
add_signal_handler (SIGINT, mono_sigint_signal_handler);
add_signal_handler (SIGFPE, mono_sigfpe_signal_handler);
add_signal_handler (SIGQUIT, sigquit_signal_handler);
add_signal_handler (SIGILL, mono_sigill_signal_handler);
add_signal_handler (SIGBUS, mono_sigsegv_signal_handler);
if (mono_jit_trace_calls != NULL)
add_signal_handler (SIGUSR2, sigusr2_signal_handler);
if (!mono_thread_info_new_interrupt_enabled ())
add_signal_handler (mono_thread_get_abort_signal (), sigusr1_signal_handler);
/* it seems to have become a common bug for some programs that run as parents
* of many processes to block signal delivery for real time signals.
* We try to detect and work around their breakage here.
*/
sigemptyset (&signal_set);
sigaddset (&signal_set, mono_thread_get_abort_signal ());
sigprocmask (SIG_UNBLOCK, &signal_set, NULL);
signal (SIGPIPE, SIG_IGN);
add_signal_handler (SIGABRT, sigabrt_signal_handler);
/* catch SIGSEGV */
add_signal_handler (SIGSEGV, mono_sigsegv_signal_handler);
}
#ifndef PLATFORM_MACOSX
void
mono_runtime_install_handlers (void)
{
mono_runtime_posix_install_handlers ();
}
#endif
void
mono_runtime_cleanup_handlers (void)
{
if (mini_get_debug_options ()->handle_sigint)
remove_signal_handler (SIGINT);
remove_signal_handler (SIGFPE);
remove_signal_handler (SIGQUIT);
remove_signal_handler (SIGILL);
remove_signal_handler (SIGBUS);
if (mono_jit_trace_calls != NULL)
remove_signal_handler (SIGUSR2);
remove_signal_handler (mono_thread_get_abort_signal ());
remove_signal_handler (SIGABRT);
remove_signal_handler (SIGSEGV);
free_saved_signal_handlers ();
}
#ifdef HAVE_LINUX_RTC_H
#include <linux/rtc.h>
#include <sys/ioctl.h>
#include <fcntl.h>
static int rtc_fd = -1;
static int
enable_rtc_timer (gboolean enable)
{
int flags;
flags = fcntl (rtc_fd, F_GETFL);
if (flags < 0) {
perror ("getflags");
return 0;
}
if (enable)
flags |= FASYNC;
else
flags &= ~FASYNC;
if (fcntl (rtc_fd, F_SETFL, flags) == -1) {
perror ("setflags");
return 0;
}
return 1;
}
#endif
void
mono_runtime_shutdown_stat_profiler (void)
{
#ifdef HAVE_LINUX_RTC_H
if (rtc_fd >= 0)
enable_rtc_timer (FALSE);
#endif
}
void
mono_runtime_setup_stat_profiler (void)
{
#ifdef ITIMER_PROF
struct itimerval itval;
static int inited = 0;
#ifdef HAVE_LINUX_RTC_H
const char *rtc_freq;
if (!inited && (rtc_freq = g_getenv ("MONO_RTC"))) {
int freq = 0;
inited = 1;
if (*rtc_freq)
freq = atoi (rtc_freq);
if (!freq)
freq = 1024;
rtc_fd = open ("/dev/rtc", O_RDONLY);
if (rtc_fd == -1) {
perror ("open /dev/rtc");
return;
}
add_signal_handler (SIGPROF, sigprof_signal_handler);
if (ioctl (rtc_fd, RTC_IRQP_SET, freq) == -1) {
perror ("set rtc freq");
return;
}
if (ioctl (rtc_fd, RTC_PIE_ON, 0) == -1) {
perror ("start rtc");
return;
}
if (fcntl (rtc_fd, F_SETSIG, SIGPROF) == -1) {
perror ("setsig");
return;
}
if (fcntl (rtc_fd, F_SETOWN, getpid ()) == -1) {
perror ("setown");
return;
}
enable_rtc_timer (TRUE);
return;
}
if (rtc_fd >= 0)
return;
#endif
itval.it_interval.tv_usec = 999;
itval.it_interval.tv_sec = 0;
itval.it_value = itval.it_interval;
setitimer (ITIMER_PROF, &itval, NULL);
if (inited)
return;
inited = 1;
add_signal_handler (SIGPROF, sigprof_signal_handler);
#endif
}
#if !defined(__APPLE__)
pid_t
mono_runtime_syscall_fork ()
{
#if defined(SYS_fork)
return (pid_t) syscall (SYS_fork);
#else
g_assert_not_reached ();
return 0;
#endif
}
void
mono_gdb_render_native_backtraces (pid_t crashed_pid)
{
const char *argv [9];
char buf1 [128];
argv [0] = g_find_program_in_path ("gdb");
if (argv [0] == NULL) {
return;
}
argv [1] = "-ex";
sprintf (buf1, "attach %ld", (long) crashed_pid);
argv [2] = buf1;
argv [3] = "--ex";
argv [4] = "info threads";
argv [5] = "--ex";
argv [6] = "thread apply all bt";
argv [7] = "--batch";
argv [8] = 0;
execv (argv [0], (char**)argv);
}
#endif
#endif /* __native_client__ */
#if !defined (__MACH__)
gboolean
mono_thread_state_init_from_handle (MonoThreadUnwindState *tctx, MonoNativeThreadId thread_id, MonoNativeThreadHandle thread_handle)
{
g_error ("Posix systems don't support mono_thread_state_init_from_handle");
return FALSE;
}
#endif