2 * Win32 exception functions
4 * Copyright (c) 1996 Onno Hovers, (onno@stack.urc.tue.nl)
5 * Copyright (c) 1999 Alexandre Julliard
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with this library; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
22 * What really happens behind the scenes of those new
23 * __try{...}__except(..){....} and
24 * __try{...}__finally{...}
25 * statements is simply not documented by Microsoft. There could be different
27 * One reason could be that they try to hide the fact that exception
28 * handling in Win32 looks almost the same as in OS/2 2.x.
29 * Another reason could be that Microsoft does not want others to write
30 * binary compatible implementations of the Win32 API (like us).
32 * Whatever the reason, THIS SUCKS!! Ensuring portability or future
33 * compatibility may be valid reasons to keep some things undocumented.
34 * But exception handling is so basic to Win32 that it should be
39 #include "wine/port.h"
44 #define WIN32_NO_STATUS
50 #include "wine/exception.h"
51 #include "wine/library.h"
53 #include "wine/unicode.h"
54 #include "wine/debug.h"
56 WINE_DEFAULT_DEBUG_CHANNEL(seh);
58 static PTOP_LEVEL_EXCEPTION_FILTER top_filter;
60 typedef INT (WINAPI *MessageBoxA_funcptr)(HWND,LPCSTR,LPCSTR,UINT);
61 typedef INT (WINAPI *MessageBoxW_funcptr)(HWND,LPCWSTR,LPCWSTR,UINT);
63 /*******************************************************************
64 * RaiseException (KERNEL32.@)
66 void WINAPI RaiseException( DWORD code, DWORD flags, DWORD nbargs, const ULONG_PTR *args )
68 EXCEPTION_RECORD record;
70 /* Compose an exception record */
72 record.ExceptionCode = code;
73 record.ExceptionFlags = flags & EH_NONCONTINUABLE;
74 record.ExceptionRecord = NULL;
75 record.ExceptionAddress = RaiseException;
78 if (nbargs > EXCEPTION_MAXIMUM_PARAMETERS) nbargs = EXCEPTION_MAXIMUM_PARAMETERS;
79 record.NumberParameters = nbargs;
80 memcpy( record.ExceptionInformation, args, nbargs * sizeof(*args) );
82 else record.NumberParameters = 0;
84 RtlRaiseException( &record );
88 /*******************************************************************
89 * format_exception_msg
91 static int format_exception_msg( const EXCEPTION_POINTERS *ptr, char *buffer, int size )
93 const EXCEPTION_RECORD *rec = ptr->ExceptionRecord;
96 switch(rec->ExceptionCode)
98 case EXCEPTION_INT_DIVIDE_BY_ZERO:
99 len = snprintf( buffer, size, "Unhandled division by zero" );
101 case EXCEPTION_INT_OVERFLOW:
102 len = snprintf( buffer, size, "Unhandled overflow" );
104 case EXCEPTION_ARRAY_BOUNDS_EXCEEDED:
105 len = snprintf( buffer, size, "Unhandled array bounds" );
107 case EXCEPTION_ILLEGAL_INSTRUCTION:
108 len = snprintf( buffer, size, "Unhandled illegal instruction" );
110 case EXCEPTION_STACK_OVERFLOW:
111 len = snprintf( buffer, size, "Unhandled stack overflow" );
113 case EXCEPTION_PRIV_INSTRUCTION:
114 len = snprintf( buffer, size, "Unhandled privileged instruction" );
116 case EXCEPTION_ACCESS_VIOLATION:
117 if (rec->NumberParameters == 2)
118 len = snprintf( buffer, size, "Unhandled page fault on %s access to 0x%08lx",
119 rec->ExceptionInformation[0] == EXCEPTION_WRITE_FAULT ? "write" :
120 rec->ExceptionInformation[0] == EXCEPTION_EXECUTE_FAULT ? "execute" : "read",
121 rec->ExceptionInformation[1]);
123 len = snprintf( buffer, size, "Unhandled page fault");
125 case EXCEPTION_DATATYPE_MISALIGNMENT:
126 len = snprintf( buffer, size, "Unhandled alignment" );
129 len = snprintf( buffer, size, "Unhandled ^C");
131 case STATUS_POSSIBLE_DEADLOCK:
132 len = snprintf( buffer, size, "Critical section %08lx wait failed",
133 rec->ExceptionInformation[0]);
135 case EXCEPTION_WINE_STUB:
136 if (HIWORD(rec->ExceptionInformation[1]))
137 len = snprintf( buffer, size, "Unimplemented function %s.%s called",
138 (char *)rec->ExceptionInformation[0], (char *)rec->ExceptionInformation[1] );
140 len = snprintf( buffer, size, "Unimplemented function %s.%ld called",
141 (char *)rec->ExceptionInformation[0], rec->ExceptionInformation[1] );
143 case EXCEPTION_WINE_ASSERTION:
144 len = snprintf( buffer, size, "Assertion failed" );
146 case EXCEPTION_VM86_INTx:
147 len = snprintf( buffer, size, "Unhandled interrupt %02lx in vm86 mode",
148 rec->ExceptionInformation[0]);
150 case EXCEPTION_VM86_STI:
151 len = snprintf( buffer, size, "Unhandled sti in vm86 mode");
153 case EXCEPTION_VM86_PICRETURN:
154 len = snprintf( buffer, size, "Unhandled PIC return in vm86 mode");
157 len = snprintf( buffer, size, "Unhandled exception 0x%08x", rec->ExceptionCode);
160 if ((len<0) || (len>=size))
163 if (ptr->ContextRecord->SegCs != wine_get_cs())
164 len2 = snprintf(buffer+len, size-len, " at address 0x%04x:0x%08x",
165 ptr->ContextRecord->SegCs,
166 (DWORD)ptr->ExceptionRecord->ExceptionAddress);
169 len2 = snprintf(buffer+len, size-len, " at address %p",
170 ptr->ExceptionRecord->ExceptionAddress);
171 if ((len2<0) || (len>=size-len))
177 /******************************************************************
180 * Does the effective debugger startup according to 'format'
182 static BOOL start_debugger(PEXCEPTION_POINTERS epointers, HANDLE hEvent)
184 OBJECT_ATTRIBUTES attr;
185 UNICODE_STRING nameW;
186 char *cmdline, *env, *p;
189 PROCESS_INFORMATION info;
190 STARTUPINFOA startup;
195 static const WCHAR AeDebugW[] = {'M','a','c','h','i','n','e','\\',
196 'S','o','f','t','w','a','r','e','\\',
197 'M','i','c','r','o','s','o','f','t','\\',
198 'W','i','n','d','o','w','s',' ','N','T','\\',
199 'C','u','r','r','e','n','t','V','e','r','s','i','o','n','\\',
200 'A','e','D','e','b','u','g',0};
201 static const WCHAR DebuggerW[] = {'D','e','b','u','g','g','e','r',0};
202 static const WCHAR AutoW[] = {'A','u','t','o',0};
204 format_exception_msg( epointers, buffer, sizeof(buffer) );
205 MESSAGE("wine: %s (thread %04x), starting debugger...\n", buffer, GetCurrentThreadId());
207 attr.Length = sizeof(attr);
208 attr.RootDirectory = 0;
209 attr.ObjectName = &nameW;
211 attr.SecurityDescriptor = NULL;
212 attr.SecurityQualityOfService = NULL;
213 RtlInitUnicodeString( &nameW, AeDebugW );
215 if (!NtOpenKey( &hDbgConf, KEY_READ, &attr ))
218 KEY_VALUE_PARTIAL_INFORMATION *info;
219 DWORD format_size = 0;
221 RtlInitUnicodeString( &nameW, DebuggerW );
222 if (NtQueryValueKey( hDbgConf, &nameW, KeyValuePartialInformation,
223 NULL, 0, &format_size ) == STATUS_BUFFER_OVERFLOW)
225 char *data = HeapAlloc(GetProcessHeap(), 0, format_size);
226 NtQueryValueKey( hDbgConf, &nameW, KeyValuePartialInformation,
227 data, format_size, &format_size );
228 info = (KEY_VALUE_PARTIAL_INFORMATION *)data;
229 RtlUnicodeToMultiByteSize( &format_size, (WCHAR *)info->Data, info->DataLength );
230 format = HeapAlloc( GetProcessHeap(), 0, format_size+1 );
231 RtlUnicodeToMultiByteN( format, format_size, NULL,
232 (WCHAR *)info->Data, info->DataLength );
233 format[format_size] = 0;
235 if (info->Type == REG_EXPAND_SZ)
239 /* Expand environment variable references */
240 format_size=ExpandEnvironmentStringsA(format,NULL,0);
241 tmp=HeapAlloc(GetProcessHeap(), 0, format_size);
242 ExpandEnvironmentStringsA(format,tmp,format_size);
243 HeapFree(GetProcessHeap(), 0, format);
246 HeapFree( GetProcessHeap(), 0, data );
249 RtlInitUnicodeString( &nameW, AutoW );
250 if (!NtQueryValueKey( hDbgConf, &nameW, KeyValuePartialInformation,
251 buffer, sizeof(buffer)-sizeof(WCHAR), &format_size ))
253 info = (KEY_VALUE_PARTIAL_INFORMATION *)buffer;
254 if (info->Type == REG_DWORD) memcpy( &bAuto, info->Data, sizeof(DWORD) );
255 else if (info->Type == REG_SZ)
257 WCHAR *str = (WCHAR *)info->Data;
258 str[info->DataLength/sizeof(WCHAR)] = 0;
259 bAuto = atoiW( str );
268 size_t format_size = strlen(format) + 2*20;
269 cmdline = HeapAlloc(GetProcessHeap(), 0, format_size);
270 snprintf(cmdline, format_size, format, (long)GetCurrentProcessId(), (long)HandleToLong(hEvent));
271 HeapFree(GetProcessHeap(), 0, format);
275 cmdline = HeapAlloc(GetProcessHeap(), 0, 80);
276 snprintf(cmdline, 80, "winedbg --auto %ld %ld", /* as in tools/wine.inf */
277 (long)GetCurrentProcessId(), (long)HandleToLong(hEvent));
282 HMODULE mod = GetModuleHandleA( "user32.dll" );
283 MessageBoxA_funcptr pMessageBoxA = NULL;
285 if (mod) pMessageBoxA = (MessageBoxA_funcptr)GetProcAddress( mod, "MessageBoxA" );
288 static const char msg[] = ".\nDo you wish to debug it?";
291 format_exception_msg( epointers, buffer, sizeof(buffer)-sizeof(msg) );
292 strcat( buffer, msg );
293 if (pMessageBoxA( 0, buffer, "Exception raised", MB_YESNO | MB_ICONHAND ) == IDNO)
295 TRACE("Killing process\n");
301 /* make WINEDEBUG empty in the environment */
302 env = GetEnvironmentStringsA();
303 for (p = env; *p; p += strlen(p) + 1)
305 if (!memcmp( p, "WINEDEBUG=", sizeof("WINEDEBUG=")-1 ))
307 char *next = p + strlen(p);
308 char *end = next + 1;
309 while (*end) end += strlen(end) + 1;
310 memmove( p + sizeof("WINEDEBUG=") - 1, next, end + 1 - next );
315 TRACE("Starting debugger %s\n", debugstr_a(cmdline));
316 memset(&startup, 0, sizeof(startup));
317 startup.cb = sizeof(startup);
318 startup.dwFlags = STARTF_USESHOWWINDOW;
319 startup.wShowWindow = SW_SHOWNORMAL;
320 ret = CreateProcessA(NULL, cmdline, NULL, NULL, TRUE, 0, env, NULL, &startup, &info);
321 FreeEnvironmentStringsA( env );
325 /* wait for debugger to come up... */
327 CloseHandle(info.hThread);
329 handles[1]=info.hProcess;
330 WaitForMultipleObjects(2, handles, FALSE, INFINITE);
331 CloseHandle(info.hProcess);
333 else ERR("Couldn't start debugger (%s) (%d)\n"
334 "Read the Wine Developers Guide on how to set up winedbg or another debugger\n",
335 debugstr_a(cmdline), GetLastError());
337 HeapFree(GetProcessHeap(), 0, cmdline);
341 /******************************************************************
342 * start_debugger_atomic
344 * starts the debugger in an atomic way:
345 * - either the debugger is not started and it is started
346 * - or the debugger has already been started by another thread
347 * - or the debugger couldn't be started
349 * returns TRUE for the two first conditions, FALSE for the last
351 static int start_debugger_atomic(PEXCEPTION_POINTERS epointers)
353 static HANDLE hRunOnce /* = 0 */;
357 OBJECT_ATTRIBUTES attr;
360 attr.Length = sizeof(attr);
361 attr.RootDirectory = 0;
362 attr.Attributes = OBJ_INHERIT;
363 attr.ObjectName = NULL;
364 attr.SecurityDescriptor = NULL;
365 attr.SecurityQualityOfService = NULL;
367 /* ask for manual reset, so that once the debugger is started,
368 * every thread will know it */
369 NtCreateEvent( &hEvent, EVENT_ALL_ACCESS, &attr, NotificationEvent, FALSE );
370 if (InterlockedCompareExchangePointer( &hRunOnce, hEvent, 0 ) == 0)
372 /* ok, our event has been set... we're the winning thread */
373 BOOL ret = start_debugger( epointers, hRunOnce );
378 /* so that the other threads won't be stuck */
379 NtSetEvent( hRunOnce, &tmp );
384 /* someone beat us here... */
385 CloseHandle( hEvent );
388 /* and wait for the winner to have actually created the debugger */
389 WaitForSingleObject( hRunOnce, INFINITE );
390 /* in fact, here, we only know that someone has tried to start the debugger,
391 * we'll know by reposting the exception if it has actually attached
392 * to the current process */
397 /*******************************************************************
398 * check_resource_write
400 * Check if the exception is a write attempt to the resource data.
401 * If yes, we unprotect the resources to let broken apps continue
402 * (Windows does this too).
404 static inline BOOL check_resource_write( void *addr )
408 MEMORY_BASIC_INFORMATION info;
410 if (!VirtualQuery( addr, &info, sizeof(info) )) return FALSE;
411 if (info.State == MEM_FREE || !(info.Type & MEM_IMAGE)) return FALSE;
412 if (!(rsrc = RtlImageDirectoryEntryToData( info.AllocationBase, TRUE,
413 IMAGE_DIRECTORY_ENTRY_RESOURCE, &size )))
415 if (addr < rsrc || (char *)addr >= (char *)rsrc + size) return FALSE;
416 TRACE( "Broken app is writing to the resource data, enabling work-around\n" );
417 VirtualProtect( rsrc, size, PAGE_WRITECOPY, NULL );
422 /*******************************************************************
423 * UnhandledExceptionFilter (KERNEL32.@)
425 LONG WINAPI UnhandledExceptionFilter(PEXCEPTION_POINTERS epointers)
427 const EXCEPTION_RECORD *rec = epointers->ExceptionRecord;
429 if (rec->ExceptionCode == EXCEPTION_ACCESS_VIOLATION && rec->NumberParameters >= 2)
431 switch(rec->ExceptionInformation[0])
433 case EXCEPTION_WRITE_FAULT:
434 if (check_resource_write( (void *)rec->ExceptionInformation[1] ))
435 return EXCEPTION_CONTINUE_EXECUTION;
440 if (!NtCurrentTeb()->Peb->BeingDebugged)
442 if (rec->ExceptionCode == CONTROL_C_EXIT)
444 /* do not launch the debugger on ^C, simply terminate the process */
445 TerminateProcess( GetCurrentProcess(), 1 );
450 LONG ret = top_filter( epointers );
451 if (ret != EXCEPTION_CONTINUE_SEARCH) return ret;
454 /* FIXME: Should check the current error mode */
456 if (!start_debugger_atomic( epointers ) || !NtCurrentTeb()->Peb->BeingDebugged)
457 return EXCEPTION_EXECUTE_HANDLER;
459 return EXCEPTION_CONTINUE_SEARCH;
463 /***********************************************************************
464 * SetUnhandledExceptionFilter (KERNEL32.@)
466 LPTOP_LEVEL_EXCEPTION_FILTER WINAPI SetUnhandledExceptionFilter(
467 LPTOP_LEVEL_EXCEPTION_FILTER filter )
469 LPTOP_LEVEL_EXCEPTION_FILTER old = top_filter;
475 /**************************************************************************
476 * FatalAppExitA (KERNEL32.@)
478 void WINAPI FatalAppExitA( UINT action, LPCSTR str )
480 HMODULE mod = GetModuleHandleA( "user32.dll" );
481 MessageBoxA_funcptr pMessageBoxA = NULL;
485 if (mod) pMessageBoxA = (MessageBoxA_funcptr)GetProcAddress( mod, "MessageBoxA" );
486 if (pMessageBoxA) pMessageBoxA( 0, str, NULL, MB_SYSTEMMODAL | MB_OK );
487 else ERR( "%s\n", debugstr_a(str) );
492 /**************************************************************************
493 * FatalAppExitW (KERNEL32.@)
495 void WINAPI FatalAppExitW( UINT action, LPCWSTR str )
497 static const WCHAR User32DllW[] = {'u','s','e','r','3','2','.','d','l','l',0};
499 HMODULE mod = GetModuleHandleW( User32DllW );
500 MessageBoxW_funcptr pMessageBoxW = NULL;
504 if (mod) pMessageBoxW = (MessageBoxW_funcptr)GetProcAddress( mod, "MessageBoxW" );
505 if (pMessageBoxW) pMessageBoxW( 0, str, NULL, MB_SYSTEMMODAL | MB_OK );
506 else ERR( "%s\n", debugstr_w(str) );
511 /**************************************************************************
512 * FatalExit (KERNEL32.@)
514 void WINAPI FatalExit(int ExitCode)
517 ExitProcess(ExitCode);