1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
/*
* Win32 exception functions
*
* Copyright (c) 1996 Onno Hovers, (onno@stack.urc.tue.nl)
* Copyright (c) 1999 Alexandre Julliard
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*
* 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 "config.h"
#include "wine/port.h"
#include <stdarg.h>
#include <stdio.h>
#include "ntstatus.h"
#define WIN32_NO_STATUS
#include "windef.h"
#include "winbase.h"
#include "winternl.h"
#include "wingdi.h"
#include "winuser.h"
#include "wine/exception.h"
#include "wine/library.h"
#include "excpt.h"
#include "wine/unicode.h"
#include "wine/debug.h"
WINE_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 ULONG_PTR *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] == EXCEPTION_WRITE_FAULT ? "write" :
rec->ExceptionInformation[0] == EXCEPTION_EXECUTE_FAULT ? "execute" : "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 STATUS_POSSIBLE_DEADLOCK:
len = snprintf( buffer, size, "Critical section %08lx wait failed",
rec->ExceptionInformation[0]);
break;
case EXCEPTION_WINE_STUB:
if (HIWORD(rec->ExceptionInformation[1]))
len = snprintf( buffer, size, "Unimplemented function %s.%s called",
(char *)rec->ExceptionInformation[0], (char *)rec->ExceptionInformation[1] );
else
len = snprintf( buffer, size, "Unimplemented function %s.%ld called",
(char *)rec->ExceptionInformation[0], rec->ExceptionInformation[1] );
break;
case EXCEPTION_WINE_ASSERTION:
len = snprintf( buffer, size, "Assertion failed" );
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%08x", rec->ExceptionCode);
break;
}
if ((len<0) || (len>=size))
return -1;
#ifdef __i386__
if (ptr->ContextRecord->SegCs != wine_get_cs())
len2 = snprintf(buffer+len, size-len, " at address 0x%04x:0x%08x",
ptr->ContextRecord->SegCs,
(DWORD)ptr->ExceptionRecord->ExceptionAddress);
else
#endif
len2 = snprintf(buffer+len, size-len, " at address %p",
ptr->ExceptionRecord->ExceptionAddress);
if ((len2<0) || (len>=size-len))
return -1;
return len+len2;
}
/******************************************************************
* start_debugger
*
* Does the effective debugger startup according to 'format'
*/
static BOOL start_debugger(PEXCEPTION_POINTERS epointers, HANDLE hEvent)
{
OBJECT_ATTRIBUTES attr;
UNICODE_STRING nameW;
char *cmdline, *env, *p;
HANDLE hDbgConf;
DWORD bAuto = TRUE;
PROCESS_INFORMATION info;
STARTUPINFOA startup;
char* format = NULL;
BOOL ret = FALSE;
char buffer[256];
static const WCHAR AeDebugW[] = {'M','a','c','h','i','n','e','\\',
'S','o','f','t','w','a','r','e','\\',
'M','i','c','r','o','s','o','f','t','\\',
'W','i','n','d','o','w','s',' ','N','T','\\',
'C','u','r','r','e','n','t','V','e','r','s','i','o','n','\\',
'A','e','D','e','b','u','g',0};
static const WCHAR DebuggerW[] = {'D','e','b','u','g','g','e','r',0};
static const WCHAR AutoW[] = {'A','u','t','o',0};
format_exception_msg( epointers, buffer, sizeof(buffer) );
MESSAGE("wine: %s (thread %04x), starting debugger...\n", buffer, GetCurrentThreadId());
attr.Length = sizeof(attr);
attr.RootDirectory = 0;
attr.ObjectName = &nameW;
attr.Attributes = 0;
attr.SecurityDescriptor = NULL;
attr.SecurityQualityOfService = NULL;
RtlInitUnicodeString( &nameW, AeDebugW );
if (!NtOpenKey( &hDbgConf, KEY_ALL_ACCESS, &attr ))
{
char buffer[64];
KEY_VALUE_PARTIAL_INFORMATION *info;
DWORD format_size = 0;
RtlInitUnicodeString( &nameW, DebuggerW );
if (NtQueryValueKey( hDbgConf, &nameW, KeyValuePartialInformation,
NULL, 0, &format_size ) == STATUS_BUFFER_OVERFLOW)
{
char *data = HeapAlloc(GetProcessHeap(), 0, format_size);
NtQueryValueKey( hDbgConf, &nameW, KeyValuePartialInformation,
data, format_size, &format_size );
info = (KEY_VALUE_PARTIAL_INFORMATION *)data;
RtlUnicodeToMultiByteSize( &format_size, (WCHAR *)info->Data, info->DataLength );
format = HeapAlloc( GetProcessHeap(), 0, format_size+1 );
RtlUnicodeToMultiByteN( format, format_size, NULL,
(WCHAR *)info->Data, info->DataLength );
format[format_size] = 0;
if (info->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;
}
HeapFree( GetProcessHeap(), 0, data );
}
RtlInitUnicodeString( &nameW, AutoW );
if (!NtQueryValueKey( hDbgConf, &nameW, KeyValuePartialInformation,
buffer, sizeof(buffer)-sizeof(WCHAR), &format_size ))
{
info = (KEY_VALUE_PARTIAL_INFORMATION *)buffer;
if (info->Type == REG_DWORD) memcpy( &bAuto, info->Data, sizeof(DWORD) );
else if (info->Type == REG_SZ)
{
WCHAR *str = (WCHAR *)info->Data;
str[info->DataLength/sizeof(WCHAR)] = 0;
bAuto = atoiW( str );
}
}
NtClose(hDbgConf);
}
if (format)
{
cmdline = HeapAlloc(GetProcessHeap(), 0, strlen(format) + 2*20);
sprintf(cmdline, format, GetCurrentProcessId(), hEvent);
HeapFree(GetProcessHeap(), 0, format);
}
else
{
cmdline = HeapAlloc(GetProcessHeap(), 0, 80);
sprintf(cmdline, "winedbg --auto %d %ld",
GetCurrentProcessId(), (ULONG_PTR)hEvent);
}
if (!bAuto)
{
HMODULE mod = GetModuleHandleA( "user32.dll" );
MessageBoxA_funcptr pMessageBoxA = NULL;
if (mod) pMessageBoxA = (MessageBoxA_funcptr)GetProcAddress( mod, "MessageBoxA" );
if (pMessageBoxA)
{
static const char msg[] = ".\nDo you wish to debug it?";
char buffer[256];
format_exception_msg( epointers, buffer, sizeof(buffer)-sizeof(msg) );
strcat( buffer, msg );
if (pMessageBoxA( 0, buffer, "Exception raised", MB_YESNO | MB_ICONHAND ) == IDNO)
{
TRACE("Killing process\n");
goto EXIT;
}
}
}
/* make WINEDEBUG empty in the environment */
env = GetEnvironmentStringsA();
for (p = env; *p; p += strlen(p) + 1)
{
if (!memcmp( p, "WINEDEBUG=", sizeof("WINEDEBUG=")-1 ))
{
char *next = p + strlen(p);
char *end = next + 1;
while (*end) end += strlen(end) + 1;
memmove( p + sizeof("WINEDEBUG=") - 1, next, end + 1 - next );
break;
}
}
TRACE("Starting debugger %s\n", debugstr_a(cmdline));
memset(&startup, 0, sizeof(startup));
startup.cb = sizeof(startup);
startup.dwFlags = STARTF_USESHOWWINDOW;
startup.wShowWindow = SW_SHOWNORMAL;
ret = CreateProcessA(NULL, cmdline, NULL, NULL, TRUE, 0, env, NULL, &startup, &info);
FreeEnvironmentStringsA( env );
if (ret)
{
/* wait for debugger to come up... */
HANDLE handles[2];
CloseHandle(info.hThread);
handles[0]=hEvent;
handles[1]=info.hProcess;
WaitForMultipleObjects(2, handles, FALSE, INFINITE);
CloseHandle(info.hProcess);
}
else ERR("Couldn't start debugger (%s) (%d)\n"
"Read the Wine Developers Guide on how to set up winedbg or another debugger\n",
debugstr_a(cmdline), GetLastError());
EXIT:
HeapFree(GetProcessHeap(), 0, cmdline);
return ret;
}
/******************************************************************
* start_debugger_atomic
*
* starts the debugger in an atomic way:
* - either the debugger is not started and it is started
* - or the debugger has already been started by another thread
* - or the debugger couldn't be started
*
* returns TRUE for the two first conditions, 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 know it */
NtCreateEvent( &hEvent, EVENT_ALL_ACCESS, &attr, TRUE, FALSE );
if (InterlockedCompareExchangePointer( (PVOID)&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;
}
/*******************************************************************
* check_resource_write
*
* Check if the exception is a write attempt to the resource data.
* If yes, we unprotect the resources to let broken apps continue
* (Windows does this too).
*/
static inline BOOL check_resource_write( void *addr )
{
void *rsrc;
DWORD size;
MEMORY_BASIC_INFORMATION info;
if (!VirtualQuery( addr, &info, sizeof(info) )) return FALSE;
if (info.State == MEM_FREE || !(info.Type & MEM_IMAGE)) return FALSE;
if (!(rsrc = RtlImageDirectoryEntryToData( (HMODULE)info.AllocationBase, TRUE,
IMAGE_DIRECTORY_ENTRY_RESOURCE, &size )))
return FALSE;
if (addr < rsrc || (char *)addr >= (char *)rsrc + size) return FALSE;
TRACE( "Broken app is writing to the resource data, enabling work-around\n" );
VirtualProtect( rsrc, size, PAGE_WRITECOPY, NULL );
return TRUE;
}
/*******************************************************************
* UnhandledExceptionFilter (KERNEL32.@)
*/
LONG WINAPI UnhandledExceptionFilter(PEXCEPTION_POINTERS epointers)
{
const EXCEPTION_RECORD *rec = epointers->ExceptionRecord;
if (rec->ExceptionCode == EXCEPTION_ACCESS_VIOLATION && rec->NumberParameters >= 2)
{
switch(rec->ExceptionInformation[0])
{
case EXCEPTION_WRITE_FAULT:
if (check_resource_write( (void *)rec->ExceptionInformation[1] ))
return EXCEPTION_CONTINUE_EXECUTION;
break;
}
}
if (!NtCurrentTeb()->Peb->BeingDebugged)
{
if (rec->ExceptionCode == CONTROL_C_EXIT)
{
/* do not launch the debugger on ^C, simply terminate the process */
TerminateProcess( GetCurrentProcess(), 1 );
}
if (top_filter)
{
LONG ret = top_filter( epointers );
if (ret != EXCEPTION_CONTINUE_SEARCH) return ret;
}
/* FIXME: Should check the current error mode */
if (!start_debugger_atomic( epointers ) || !NtCurrentTeb()->Peb->BeingDebugged)
return EXCEPTION_EXECUTE_HANDLER;
}
return EXCEPTION_CONTINUE_SEARCH;
}
/***********************************************************************
* 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 )
{
static const WCHAR User32DllW[] = {'u','s','e','r','3','2','.','d','l','l',0};
HMODULE mod = GetModuleHandleW( User32DllW );
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);
}
/**************************************************************************
* FatalExit (KERNEL32.@)
*/
void WINAPI FatalExit(int ExitCode)
{
WARN("FatalExit\n");
ExitProcess(ExitCode);
}