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Sweden-Number/win32/except.c

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/*
* Win32 exception functions
*
* Copyright (c) 1996 Onno Hovers, (onno@stack.urc.tue.nl)
* Copyright (c) 1999 Alexandre Julliard
*
* Notes:
* What really happens behind the scenes of those new
* __try{...}__except(..){....} and
* __try{...}__finally{...}
* statements is simply not documented by Microsoft. There could be different
* reasons for this:
* One reason could be that they try to hide the fact that exception
* handling in Win32 looks almost the same as in OS/2 2.x.
* Another reason could be that Microsoft does not want others to write
* binary compatible implementations of the Win32 API (like us).
*
* Whatever the reason, THIS SUCKS!! Ensuring portability or future
* compatibility may be valid reasons to keep some things undocumented.
* But exception handling is so basic to Win32 that it should be
* documented!
*
*/
#include <stdio.h>
#include "windef.h"
#include "winerror.h"
#include "ntddk.h"
#include "wingdi.h"
#include "winuser.h"
#include "wine/exception.h"
#include "thread.h"
#include "stackframe.h"
#include "wine/server.h"
#include "debugtools.h"
DEFAULT_DEBUG_CHANNEL(seh);
static PTOP_LEVEL_EXCEPTION_FILTER top_filter;
typedef INT (WINAPI *MessageBoxA_funcptr)(HWND,LPCSTR,LPCSTR,UINT);
typedef INT (WINAPI *MessageBoxW_funcptr)(HWND,LPCWSTR,LPCWSTR,UINT);
/*******************************************************************
* RaiseException (KERNEL32.@)
*/
void WINAPI RaiseException( DWORD code, DWORD flags, DWORD nbargs, const LPDWORD args )
{
EXCEPTION_RECORD record;
/* Compose an exception record */
record.ExceptionCode = code;
record.ExceptionFlags = flags & EH_NONCONTINUABLE;
record.ExceptionRecord = NULL;
record.ExceptionAddress = RaiseException;
if (nbargs && args)
{
if (nbargs > EXCEPTION_MAXIMUM_PARAMETERS) nbargs = EXCEPTION_MAXIMUM_PARAMETERS;
record.NumberParameters = nbargs;
memcpy( record.ExceptionInformation, args, nbargs * sizeof(*args) );
}
else record.NumberParameters = 0;
RtlRaiseException( &record );
}
/*******************************************************************
* format_exception_msg
*/
static int format_exception_msg( const EXCEPTION_POINTERS *ptr, char *buffer, int size )
{
const EXCEPTION_RECORD *rec = ptr->ExceptionRecord;
int len,len2;
switch(rec->ExceptionCode)
{
case EXCEPTION_INT_DIVIDE_BY_ZERO:
len = snprintf( buffer, size, "Unhandled division by zero" );
break;
case EXCEPTION_INT_OVERFLOW:
len = snprintf( buffer, size, "Unhandled overflow" );
break;
case EXCEPTION_ARRAY_BOUNDS_EXCEEDED:
len = snprintf( buffer, size, "Unhandled array bounds" );
break;
case EXCEPTION_ILLEGAL_INSTRUCTION:
len = snprintf( buffer, size, "Unhandled illegal instruction" );
break;
case EXCEPTION_STACK_OVERFLOW:
len = snprintf( buffer, size, "Unhandled stack overflow" );
break;
case EXCEPTION_PRIV_INSTRUCTION:
len = snprintf( buffer, size, "Unhandled privileged instruction" );
break;
case EXCEPTION_ACCESS_VIOLATION:
if (rec->NumberParameters == 2)
len = snprintf( buffer, size, "Unhandled page fault on %s access to 0x%08lx",
rec->ExceptionInformation[0] ? "write" : "read",
rec->ExceptionInformation[1]);
else
len = snprintf( buffer, size, "Unhandled page fault");
break;
case EXCEPTION_DATATYPE_MISALIGNMENT:
len = snprintf( buffer, size, "Unhandled alignment" );
break;
case CONTROL_C_EXIT:
len = snprintf( buffer, size, "Unhandled ^C");
break;
case EXCEPTION_CRITICAL_SECTION_WAIT:
len = snprintf( buffer, size, "Critical section %08lx wait failed",
rec->ExceptionInformation[0]);
break;
case EXCEPTION_WINE_STUB:
len = snprintf( buffer, size, "Unimplemented function %s.%s called",
(char *)rec->ExceptionInformation[0], (char *)rec->ExceptionInformation[1] );
break;
case EXCEPTION_VM86_INTx:
len = snprintf( buffer, size, "Unhandled interrupt %02lx in vm86 mode",
rec->ExceptionInformation[0]);
break;
case EXCEPTION_VM86_STI:
len = snprintf( buffer, size, "Unhandled sti in vm86 mode");
break;
case EXCEPTION_VM86_PICRETURN:
len = snprintf( buffer, size, "Unhandled PIC return in vm86 mode");
break;
default:
len = snprintf( buffer, size, "Unhandled exception 0x%08lx", rec->ExceptionCode);
break;
}
if ((len<0) || (len>=size))
return -1;
#ifdef __i386__
if (ptr->ContextRecord->SegCs != __get_cs())
len2 = snprintf(buffer+len, size-len,
" at address 0x%04lx:0x%08lx.\nDo you wish to debug it ?",
ptr->ContextRecord->SegCs,
(DWORD)ptr->ExceptionRecord->ExceptionAddress);
else
#endif
len2 = snprintf(buffer+len, size-len,
" at address 0x%08lx.\nDo you wish to debug it ?",
(DWORD)ptr->ExceptionRecord->ExceptionAddress);
if ((len2<0) || (len>=size-len))
return -1;
return len+len2;
}
/**********************************************************************
* send_debug_event
*
* Send an EXCEPTION_DEBUG_EVENT event to the debugger.
*/
static int send_debug_event( EXCEPTION_RECORD *rec, int first_chance, CONTEXT *context )
{
int ret;
HANDLE handle = 0;
SERVER_START_VAR_REQ( queue_exception_event, sizeof(*rec) + sizeof(*context) )
{
CONTEXT *context_ptr = server_data_ptr(req);
EXCEPTION_RECORD *rec_ptr = (EXCEPTION_RECORD *)(context_ptr + 1);
req->first = first_chance;
*rec_ptr = *rec;
*context_ptr = *context;
if (!SERVER_CALL()) handle = req->handle;
}
SERVER_END_VAR_REQ;
if (!handle) return 0; /* no debugger present or other error */
/* No need to wait on the handle since the process gets suspended
* once the event is passed to the debugger, so when we get back
* here the event has been continued already.
*/
SERVER_START_VAR_REQ( get_exception_status, sizeof(*context) )
{
req->handle = handle;
if (!SERVER_CALL()) *context = *(CONTEXT *)server_data_ptr(req);
ret = req->status;
}
SERVER_END_VAR_REQ;
NtClose( handle );
return ret;
}
/******************************************************************
* start_debugger
*
* Does the effective debugger startup according to 'format'
*/
static BOOL start_debugger(PEXCEPTION_POINTERS epointers, HANDLE hEvent)
{
HKEY hDbgConf;
DWORD bAuto = FALSE;
PROCESS_INFORMATION info;
STARTUPINFOA startup;
char* cmdline = NULL;
char* format = NULL;
DWORD format_size;
BOOL ret = FALSE;
MESSAGE("wine: Unhandled exception, starting debugger...\n");
if (!RegOpenKeyA(HKEY_LOCAL_MACHINE,
"Software\\Microsoft\\Windows NT\\CurrentVersion\\AeDebug", &hDbgConf)) {
DWORD type;
DWORD count;
format_size = 0;
if (!RegQueryValueExA(hDbgConf, "Debugger", 0, &type, NULL, &format_size)) {
format = HeapAlloc(GetProcessHeap(), 0, format_size);
RegQueryValueExA(hDbgConf, "Debugger", 0, &type, format, &format_size);
if (type==REG_EXPAND_SZ) {
char* tmp;
/* Expand environment variable references */
format_size=ExpandEnvironmentStringsA(format,NULL,0);
tmp=HeapAlloc(GetProcessHeap(), 0, format_size);
ExpandEnvironmentStringsA(format,tmp,format_size);
HeapFree(GetProcessHeap(), 0, format);
format=tmp;
}
}
count = sizeof(bAuto);
if (RegQueryValueExA(hDbgConf, "Auto", 0, &type, (char*)&bAuto, &count))
bAuto = TRUE;
else if (type == REG_SZ)
{
char autostr[10];
count = sizeof(autostr);
if (!RegQueryValueExA(hDbgConf, "Auto", 0, &type, autostr, &count))
bAuto = atoi(autostr);
}
RegCloseKey(hDbgConf);
} else {
/* try a default setup... */
strcpy( format, "winedbg --debugmsg -all -- --auto %ld %ld" );
}
if (!bAuto)
{
HMODULE mod = GetModuleHandleA( "user32.dll" );
MessageBoxA_funcptr pMessageBoxA = NULL;
if (mod) pMessageBoxA = (MessageBoxA_funcptr)GetProcAddress( mod, "MessageBoxA" );
if (pMessageBoxA)
{
char buffer[256];
format_exception_msg( epointers, buffer, sizeof(buffer) );
if (pMessageBoxA( 0, buffer, "Exception raised", MB_YESNO | MB_ICONHAND ) == IDNO)
{
TRACE("Killing process\n");
goto EXIT;
}
}
}
if (format) {
TRACE("Starting debugger (fmt=%s)\n", format);
cmdline=HeapAlloc(GetProcessHeap(), 0, format_size+2*20);
sprintf(cmdline, format, GetCurrentProcessId(), hEvent);
memset(&startup, 0, sizeof(startup));
startup.cb = sizeof(startup);
startup.dwFlags = STARTF_USESHOWWINDOW;
startup.wShowWindow = SW_SHOWNORMAL;
if (CreateProcessA(NULL, cmdline, NULL, NULL, TRUE, 0, NULL, NULL, &startup, &info)) {
/* wait for debugger to come up... */
WaitForSingleObject(hEvent, INFINITE);
ret = TRUE;
goto EXIT;
}
} else {
cmdline = NULL;
}
ERR("Couldn't start debugger (%s) (%ld)\n"
"Read the Wine Developers Guide on how to set up winedbg or another debugger\n",
debugstr_a(cmdline), GetLastError());
EXIT:
if (cmdline)
HeapFree(GetProcessHeap(), 0, cmdline);
if (format)
HeapFree(GetProcessHeap(), 0, format);
return ret;
}
/******************************************************************
* start_debugger_atomic
*
* starts the debugger is an atomic way:
* - either the debugger is not started and it is started
* - either the debugger has already been started by an other thread
* - either the debugger couldn't be started
*
* returns TRUE for the two first condition, FALSE for the last
*/
static int start_debugger_atomic(PEXCEPTION_POINTERS epointers)
{
static HANDLE hRunOnce /* = 0 */;
if (hRunOnce == 0)
{
OBJECT_ATTRIBUTES attr;
HANDLE hEvent;
attr.Length = sizeof(attr);
attr.RootDirectory = 0;
attr.Attributes = OBJ_INHERIT;
attr.ObjectName = NULL;
attr.SecurityDescriptor = NULL;
attr.SecurityQualityOfService = NULL;
/* ask for manual reset, so that once the debugger is started, every thread will be
* know it
*/
NtCreateEvent( &hEvent, EVENT_ALL_ACCESS, &attr, TRUE, FALSE );
if (InterlockedCompareExchange( (LPLONG)&hRunOnce, hEvent, 0 ) == 0)
{
/* ok, our event has been set... we're the winning thread */
BOOL ret = start_debugger( epointers, hRunOnce );
DWORD tmp;
if (!ret)
{
/* so that the other threads won't be stuck */
NtSetEvent( hRunOnce, &tmp );
}
return ret;
}
/* someone beat us here... */
CloseHandle( hEvent );
}
/* and wait for the winner to have actually created the debugger */
WaitForSingleObject( hRunOnce, INFINITE );
/* in fact, here, we only know that someone has tried to start the debugger, we'll know
* by reposting the exception if it has actually attached to the current process
*/
return TRUE;
}
/*******************************************************************
* UnhandledExceptionFilter (KERNEL32.@)
*/
DWORD WINAPI UnhandledExceptionFilter(PEXCEPTION_POINTERS epointers)
{
int status;
int loop = 0;
for (loop = 0; loop <= 1; loop++)
{
/* send a last chance event to the debugger */
status = send_debug_event( epointers->ExceptionRecord, FALSE, epointers->ContextRecord );
switch (status)
{
case DBG_CONTINUE:
return EXCEPTION_CONTINUE_EXECUTION;
case DBG_EXCEPTION_NOT_HANDLED:
TerminateProcess( GetCurrentProcess(), epointers->ExceptionRecord->ExceptionCode );
break; /* not reached */
case 0: /* no debugger is present */
if (epointers->ExceptionRecord->ExceptionCode == CONTROL_C_EXIT)
{
/* do not launch the debugger on ^C, simply terminate the process */
TerminateProcess( GetCurrentProcess(), 1 );
}
/* second try, the debugger isn't present... */
if (loop == 1) return EXCEPTION_EXECUTE_HANDLER;
break;
default:
FIXME("Unsupported yet debug continue value %d (please report)\n", status);
return EXCEPTION_EXECUTE_HANDLER;
}
/* should only be there when loop == 0 */
if (top_filter)
{
DWORD ret = top_filter( epointers );
if (ret != EXCEPTION_CONTINUE_SEARCH) return ret;
}
/* FIXME: Should check the current error mode */
if (!start_debugger_atomic( epointers ))
return EXCEPTION_EXECUTE_HANDLER;
/* now that we should have a debugger attached, try to resend event */
}
return EXCEPTION_EXECUTE_HANDLER;
}
/***********************************************************************
* SetUnhandledExceptionFilter (KERNEL32.@)
*/
LPTOP_LEVEL_EXCEPTION_FILTER WINAPI SetUnhandledExceptionFilter(
LPTOP_LEVEL_EXCEPTION_FILTER filter )
{
LPTOP_LEVEL_EXCEPTION_FILTER old = top_filter;
top_filter = filter;
return old;
}
/**************************************************************************
* FatalAppExitA (KERNEL32.@)
*/
void WINAPI FatalAppExitA( UINT action, LPCSTR str )
{
HMODULE mod = GetModuleHandleA( "user32.dll" );
MessageBoxA_funcptr pMessageBoxA = NULL;
WARN("AppExit\n");
if (mod) pMessageBoxA = (MessageBoxA_funcptr)GetProcAddress( mod, "MessageBoxA" );
if (pMessageBoxA) pMessageBoxA( 0, str, NULL, MB_SYSTEMMODAL | MB_OK );
else ERR( "%s\n", debugstr_a(str) );
ExitProcess(0);
}
/**************************************************************************
* FatalAppExitW (KERNEL32.@)
*/
void WINAPI FatalAppExitW( UINT action, LPCWSTR str )
{
HMODULE mod = GetModuleHandleA( "user32.dll" );
MessageBoxW_funcptr pMessageBoxW = NULL;
WARN("AppExit\n");
if (mod) pMessageBoxW = (MessageBoxW_funcptr)GetProcAddress( mod, "MessageBoxW" );
if (pMessageBoxW) pMessageBoxW( 0, str, NULL, MB_SYSTEMMODAL | MB_OK );
else ERR( "%s\n", debugstr_w(str) );
ExitProcess(0);
}
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