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/**
* \file
* POSIX signal handling support for Mono.
*
* Authors:
* Mono Team (mono-list@lists.ximian.com)
*
* Copyright 2001-2003 Ximian, Inc.
* Copyright 2003-2008 Ximian, Inc.
*
* See LICENSE for licensing information.
* Licensed under the MIT license. See LICENSE file in the project root for full license information.
*/
#include <config.h>
#include <signal.h>
#include <math.h>
#include <conio.h>
#include <assert.h>
#include <mono/metadata/coree.h>
#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/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-internals.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-internals.h>
#include <mono/utils/mono-mmap.h>
#include <mono/utils/dtrace.h>
#include <mono/utils/w32subset.h>
#include "mini.h"
#include "mini-runtime.h"
#include "mini-windows.h"
#include <string.h>
#include <ctype.h>
#include "trace.h"
#include "version.h"
#include "jit-icalls.h"
#define MONO_HANDLER_DELIMITER ','
#define MONO_HANDLER_DELIMITER_LEN G_N_ELEMENTS(MONO_HANDLER_DELIMITER)-1
#define MONO_HANDLER_ATEXIT_WAIT_KEYPRESS "atexit-waitkeypress"
#define MONO_HANDLER_ATEXIT_WAIT_KEYPRESS_LEN G_N_ELEMENTS(MONO_HANDLER_ATEXIT_WAIT_KEYPRESS)-1
// Typedefs used to setup handler table.
typedef void (*handler)(void);
typedef struct {
const char * cmd;
const int cmd_len;
handler handler;
} HandlerItem;
#if HAVE_API_SUPPORT_WIN32_CONSOLE
/**
* atexit_wait_keypress:
*
* This function is installed as an atexit function making sure that the console is not terminated before the end user has a chance to read the result.
* This can be handy in debug scenarios (running from within the debugger) since an exit of the process will close the console window
* without giving the end user a chance to look at the output before closed.
*/
static void
atexit_wait_keypress (void)
{
fflush (stdin);
printf ("Press any key to continue . . . ");
fflush (stdout);
_getch ();
return;
}
/**
* install_atexit_wait_keypress:
*
* This function installs the wait keypress exit handler.
*/
static void
install_atexit_wait_keypress (void)
{
atexit (atexit_wait_keypress);
return;
}
#else
/**
* install_atexit_wait_keypress:
*
* Not supported on WINAPI family.
*/
static void
install_atexit_wait_keypress (void)
{
return;
}
#endif /* HAVE_API_SUPPORT_WIN32_CONSOLE */
// Table describing handlers that can be installed at process startup. Adding a new handler can be done by adding a new item to the table together with an install handler function.
const HandlerItem g_handler_items[] = { { MONO_HANDLER_ATEXIT_WAIT_KEYPRESS, MONO_HANDLER_ATEXIT_WAIT_KEYPRESS_LEN, install_atexit_wait_keypress },
{ NULL, 0, NULL } };
/**
* get_handler_arg_len:
* @handlers: Get length of next handler.
*
* This function calculates the length of next handler included in argument.
*
* Returns: The length of next handler, if available.
*/
static size_t
get_next_handler_arg_len (const char *handlers)
{
assert (handlers != NULL);
size_t current_len = 0;
const char *handler = strchr (handlers, MONO_HANDLER_DELIMITER);
if (handler != NULL) {
// Get length of next handler arg.
current_len = (handler - handlers);
} else {
// Consume rest as length of next handler arg.
current_len = strlen (handlers);
}
return current_len;
}
/**
* install_custom_handler:
* @handlers: Handlers included in --handler argument, example "atexit-waitkeypress,someothercmd,yetanothercmd".
* @handler_arg_len: Output, length of consumed handler.
*
* This function installs the next handler included in @handlers parameter.
*
* Returns: TRUE on successful install, FALSE on failure or unrecognized handler.
*/
static gboolean
install_custom_handler (const char *handlers, size_t *handler_arg_len)
{
gboolean result = FALSE;
assert (handlers != NULL);
assert (handler_arg_len);
*handler_arg_len = get_next_handler_arg_len (handlers);
for (int current_item = 0; current_item < G_N_ELEMENTS (g_handler_items); ++current_item) {
const HandlerItem * handler_item = &g_handler_items [current_item];
if (handler_item->cmd == NULL)
continue;
if (*handler_arg_len == handler_item->cmd_len && strncmp (handlers, handler_item->cmd, *handler_arg_len) == 0) {
assert (handler_item->handler != NULL);
handler_item->handler ();
result = TRUE;
break;
}
}
return result;
}
void
mono_runtime_install_handlers (void)
{
#ifndef MONO_CROSS_COMPILE
win32_seh_init();
win32_seh_set_handler(SIGFPE, mono_sigfpe_signal_handler);
win32_seh_set_handler(SIGILL, mono_crashing_signal_handler);
win32_seh_set_handler(SIGSEGV, mono_sigsegv_signal_handler);
if (mini_debug_options.handle_sigint)
win32_seh_set_handler(SIGINT, mono_sigint_signal_handler);
#endif
}
gboolean
mono_runtime_install_custom_handlers (const char *handlers)
{
gboolean result = FALSE;
assert (handlers != NULL);
while (*handlers != '\0') {
size_t handler_arg_len = 0;
result = install_custom_handler (handlers, &handler_arg_len);
handlers += handler_arg_len;
if (*handlers == MONO_HANDLER_DELIMITER)
handlers++;
if (!result)
break;
}
return result;
}
void
mono_runtime_install_custom_handlers_usage (void)
{
fprintf (stdout,
"Custom Handlers:\n"
" --handlers=HANDLERS Enable handler support, HANDLERS is a comma\n"
" separated list of available handlers to install.\n"
"\n"
#if HAVE_API_SUPPORT_WIN32_CONSOLE
"HANDLERS is composed of:\n"
" atexit-waitkeypress Install an atexit handler waiting for a keypress\n"
" before exiting process.\n");
#else
"No handlers supported on current platform.\n");
#endif /* HAVE_API_SUPPORT_WIN32_CONSOLE */
}
void
mono_runtime_cleanup_handlers (void)
{
#ifndef MONO_CROSS_COMPILE
win32_seh_cleanup();
#endif
}
void
mono_init_native_crash_info (void)
{
return;
}
void
mono_cleanup_native_crash_info (void)
{
return;
}
/* 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
MONO_SIG_HANDLER_SIGNATURE (mono_chain_signal)
{
/* Set to FALSE to indicate that vectored exception handling should continue to look for handler */
MONO_SIG_HANDLER_GET_INFO ()->handled = FALSE;
return TRUE;
}
#if !HAVE_EXTERN_DEFINED_NATIVE_CRASH_HANDLER
#ifndef MONO_CROSS_COMPILE
void
mono_dump_native_crash_info (const char *signal, MonoContext *mctx, MONO_SIG_HANDLER_INFO_TYPE *info)
{
//TBD
}
void
mono_post_native_crash_handler (const char *signal, MonoContext *mctx, MONO_SIG_HANDLER_INFO_TYPE *info, gboolean crash_chaining)
{
if (!crash_chaining)
abort ();
}
#endif /* !MONO_CROSS_COMPILE */
#endif /* !HAVE_EXTERN_DEFINED_NATIVE_CRASH_HANDLER */
#if HAVE_API_SUPPORT_WIN32_TIMERS
#include <mmsystem.h>
static MMRESULT g_timer_event = 0;
static HANDLE g_timer_main_thread = INVALID_HANDLE_VALUE;
static VOID
thread_timer_expired (HANDLE thread)
{
CONTEXT context;
context.ContextFlags = CONTEXT_CONTROL;
if (GetThreadContext (thread, &context)) {
guchar *ip;
#ifdef _WIN64
ip = (guchar *) context.Rip;
#else
ip = (guchar *) context.Eip;
#endif
MONO_PROFILER_RAISE (sample_hit, (ip, &context));
}
}
static VOID CALLBACK
timer_event_proc (UINT uID, UINT uMsg, DWORD_PTR dwUser, DWORD_PTR dw1, DWORD_PTR dw2)
{
thread_timer_expired ((HANDLE)dwUser);
}
static VOID
stop_profiler_timer_event (void)
{
if (g_timer_event != 0) {
timeKillEvent (g_timer_event);
g_timer_event = 0;
}
if (g_timer_main_thread != INVALID_HANDLE_VALUE) {
CloseHandle (g_timer_main_thread);
g_timer_main_thread = INVALID_HANDLE_VALUE;
}
}
static VOID
start_profiler_timer_event (void)
{
g_return_if_fail (g_timer_main_thread == INVALID_HANDLE_VALUE && g_timer_event == 0);
TIMECAPS timecaps;
if (timeGetDevCaps (&timecaps, sizeof (timecaps)) != TIMERR_NOERROR)
return;
g_timer_main_thread = OpenThread (READ_CONTROL | THREAD_GET_CONTEXT, FALSE, GetCurrentThreadId ());
if (g_timer_main_thread == NULL)
return;
if (timeBeginPeriod (1) != TIMERR_NOERROR)
return;
g_timer_event = timeSetEvent (1, 0, (LPTIMECALLBACK)timer_event_proc, (DWORD_PTR)g_timer_main_thread, TIME_PERIODIC | TIME_KILL_SYNCHRONOUS);
if (g_timer_event == 0) {
timeEndPeriod (1);
return;
}
}
void
mono_runtime_setup_stat_profiler (void)
{
start_profiler_timer_event ();
return;
}
void
mono_runtime_shutdown_stat_profiler (void)
{
stop_profiler_timer_event ();
return;
}
#elif !HAVE_EXTERN_DEFINED_WIN32_TIMERS
void
mono_runtime_setup_stat_profiler (void)
{
g_unsupported_api ("timeGetDevCaps, timeBeginPeriod, timeEndPeriod, timeSetEvent, timeKillEvent");
SetLastError (ERROR_NOT_SUPPORTED);
return;
}
void
mono_runtime_shutdown_stat_profiler (void)
{
g_unsupported_api ("timeGetDevCaps, timeBeginPeriod, timeEndPeriod, timeSetEvent, timeKillEvent");
SetLastError (ERROR_NOT_SUPPORTED);
return;
}
#endif /* HAVE_API_SUPPORT_WIN32_TIMERS */
#if HAVE_API_SUPPORT_WIN32_OPEN_THREAD
gboolean
mono_setup_thread_context(DWORD thread_id, MonoContext *mono_context)
{
HANDLE handle;
CONTEXT context;
g_assert (thread_id != GetCurrentThreadId ());
handle = OpenThread (THREAD_ALL_ACCESS, FALSE, thread_id);
g_assert (handle);
context.ContextFlags = CONTEXT_INTEGER | CONTEXT_FLOATING_POINT | CONTEXT_CONTROL;
if (!GetThreadContext (handle, &context)) {
CloseHandle (handle);
return FALSE;
}
memset (mono_context, 0, sizeof (MonoContext));
mono_sigctx_to_monoctx (&context, mono_context);
CloseHandle (handle);
return TRUE;
}
#elif !HAVE_EXTERN_DEFINED_WIN32_OPEN_THREAD
gboolean
mono_setup_thread_context (DWORD thread_id, MonoContext *mono_context)
{
g_unsupported_api ("OpenThread");
SetLastError (ERROR_NOT_SUPPORTED);
return FALSE;
}
#endif /* HAVE_API_SUPPORT_WIN32_OPEN_THREAD */
gboolean
mono_thread_state_init_from_handle (MonoThreadUnwindState *tctx, MonoThreadInfo *info, void *sigctx)
{
tctx->valid = FALSE;
tctx->unwind_data [MONO_UNWIND_DATA_DOMAIN] = NULL;
tctx->unwind_data [MONO_UNWIND_DATA_LMF] = NULL;
tctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS] = NULL;
if (sigctx == NULL) {
DWORD id = mono_thread_info_get_tid (info);
mono_setup_thread_context (id, &tctx->ctx);
} else {
g_assert (((CONTEXT *)sigctx)->ContextFlags & CONTEXT_INTEGER);
g_assert (((CONTEXT *)sigctx)->ContextFlags & CONTEXT_CONTROL);
mono_sigctx_to_monoctx (sigctx, &tctx->ctx);
}
/* mono_set_jit_tls () sets this */
void *jit_tls = mono_thread_info_tls_get (info, TLS_KEY_JIT_TLS);
/* SET_APPDOMAIN () sets this */
void *domain = mono_thread_info_tls_get (info, TLS_KEY_DOMAIN);
/*Thread already started to cleanup, can no longer capture unwind state*/
if (!jit_tls || !domain)
return FALSE;
/*
* The current LMF address is kept in a separate TLS variable, and its hard to read its value without
* arch-specific code. But the address of the TLS variable is stored in another TLS variable which
* can be accessed through MonoThreadInfo.
*/
/* mono_set_lmf_addr () sets this */
MonoLMF *lmf = NULL;
MonoLMF **addr = (MonoLMF**)mono_thread_info_tls_get (info, TLS_KEY_LMF_ADDR);
if (addr)
lmf = *addr;
tctx->unwind_data [MONO_UNWIND_DATA_DOMAIN] = domain;
tctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS] = jit_tls;
tctx->unwind_data [MONO_UNWIND_DATA_LMF] = lmf;
tctx->valid = TRUE;
return TRUE;
}
BOOL
mono_win32_runtime_tls_callback (HMODULE module_handle, DWORD reason, LPVOID reserved, MonoWin32TLSCallbackType callback_type)
{
if (!mono_win32_handle_tls_callback_type (callback_type))
return TRUE;
if (!mono_gc_dllmain (module_handle, reason, reserved))
return FALSE;
switch (reason)
{
case DLL_PROCESS_ATTACH:
mono_install_runtime_load (mini_init);
break;
case DLL_PROCESS_DETACH:
if (coree_module_handle)
FreeLibrary (coree_module_handle);
break;
case DLL_THREAD_DETACH:
mono_thread_info_detach ();
break;
}
return TRUE;
}
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