1 /*
2 * msvcrt.dll exception handling
3 *
4 * Copyright 2000 Jon Griffiths
5 * Copyright 2005 Juan Lang
6 *
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.
11 *
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.
16 *
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
20 *
21 * FIXME: Incomplete support for nested exceptions/try block cleanup.
22 */
23
24 #include <float.h>
25 #include <signal.h>
26 #include <stdarg.h>
27 #include <stdbool.h>
28
29 #include "ntstatus.h"
30 #define WIN32_NO_STATUS
31 #include "windef.h"
32 #include "winbase.h"
33 #include "winternl.h"
34 #ifdef __REACTOS__ // FIXME: Clean up wine headers!
35 #include "wine/exception.h"
36 #endif // __REACTOS__
37 #include "msvcrt.h"
38 #include "excpt.h"
39 #include "wincon.h"
40 #include "wine/debug.h"
41
42 #include "cppexcept.h"
43
44 WINE_DEFAULT_DEBUG_CHANNEL(seh);
45
46 #if _MSVCR_VER>=70 && _MSVCR_VER<=71
47 static MSVCRT_security_error_handler security_error_handler;
48 #endif
49
50 static __sighandler_t sighandlers[NSIG] = { SIG_DFL };
51
msvcrt_console_handler(DWORD ctrlType)52 static BOOL WINAPI msvcrt_console_handler(DWORD ctrlType)
53 {
54 BOOL ret = FALSE;
55
56 switch (ctrlType)
57 {
58 case CTRL_C_EVENT:
59 if (sighandlers[SIGINT])
60 {
61 if (sighandlers[SIGINT] != SIG_IGN)
62 sighandlers[SIGINT](SIGINT);
63 ret = TRUE;
64 }
65 break;
66 }
67 return ret;
68 }
69
70 /*********************************************************************
71 * __pxcptinfoptrs (MSVCRT.@)
72 */
__pxcptinfoptrs(void)73 void** CDECL __pxcptinfoptrs(void)
74 {
75 return (void**)&msvcrt_get_thread_data()->xcptinfo;
76 }
77
78 typedef void (CDECL *float_handler)(int, int);
79
80 /* The exception codes are actually NTSTATUS values */
81 static const struct
82 {
83 NTSTATUS status;
84 int signal;
85 } float_exception_map[] = {
86 { EXCEPTION_FLT_DENORMAL_OPERAND, _FPE_DENORMAL },
87 { EXCEPTION_FLT_DIVIDE_BY_ZERO, _FPE_ZERODIVIDE },
88 { EXCEPTION_FLT_INEXACT_RESULT, _FPE_INEXACT },
89 { EXCEPTION_FLT_INVALID_OPERATION, _FPE_INVALID },
90 { EXCEPTION_FLT_OVERFLOW, _FPE_OVERFLOW },
91 { EXCEPTION_FLT_STACK_CHECK, _FPE_STACKOVERFLOW },
92 { EXCEPTION_FLT_UNDERFLOW, _FPE_UNDERFLOW },
93 };
94
msvcrt_exception_filter(struct _EXCEPTION_POINTERS * except)95 static LONG msvcrt_exception_filter(struct _EXCEPTION_POINTERS *except)
96 {
97 LONG ret = EXCEPTION_CONTINUE_SEARCH;
98 __sighandler_t handler;
99
100 if (!except || !except->ExceptionRecord)
101 return EXCEPTION_CONTINUE_SEARCH;
102
103 switch (except->ExceptionRecord->ExceptionCode)
104 {
105 case EXCEPTION_ACCESS_VIOLATION:
106 if ((handler = sighandlers[SIGSEGV]) != SIG_DFL)
107 {
108 if (handler != SIG_IGN)
109 {
110 EXCEPTION_POINTERS **ep = (EXCEPTION_POINTERS**)__pxcptinfoptrs(), *old_ep;
111
112 old_ep = *ep;
113 *ep = except;
114 sighandlers[SIGSEGV] = SIG_DFL;
115 handler(SIGSEGV);
116 *ep = old_ep;
117 }
118 ret = EXCEPTION_CONTINUE_EXECUTION;
119 }
120 break;
121 /* According to msdn,
122 * the FPE signal handler takes as a second argument the type of
123 * floating point exception.
124 */
125 case EXCEPTION_FLT_DENORMAL_OPERAND:
126 case EXCEPTION_FLT_DIVIDE_BY_ZERO:
127 case EXCEPTION_FLT_INEXACT_RESULT:
128 case EXCEPTION_FLT_INVALID_OPERATION:
129 case EXCEPTION_FLT_OVERFLOW:
130 case EXCEPTION_FLT_STACK_CHECK:
131 case EXCEPTION_FLT_UNDERFLOW:
132 if ((handler = sighandlers[SIGFPE]) != SIG_DFL)
133 {
134 if (handler != SIG_IGN)
135 {
136 EXCEPTION_POINTERS **ep = (EXCEPTION_POINTERS**)__pxcptinfoptrs(), *old_ep;
137 unsigned int i;
138 int float_signal = _FPE_INVALID;
139
140 sighandlers[SIGFPE] = SIG_DFL;
141 for (i = 0; i < ARRAY_SIZE(float_exception_map); i++)
142 {
143 if (float_exception_map[i].status ==
144 except->ExceptionRecord->ExceptionCode)
145 {
146 float_signal = float_exception_map[i].signal;
147 break;
148 }
149 }
150
151 old_ep = *ep;
152 *ep = except;
153 ((float_handler)handler)(SIGFPE, float_signal);
154 *ep = old_ep;
155 }
156 ret = EXCEPTION_CONTINUE_EXECUTION;
157 }
158 break;
159 case EXCEPTION_ILLEGAL_INSTRUCTION:
160 case EXCEPTION_PRIV_INSTRUCTION:
161 if ((handler = sighandlers[SIGILL]) != SIG_DFL)
162 {
163 if (handler != SIG_IGN)
164 {
165 EXCEPTION_POINTERS **ep = (EXCEPTION_POINTERS**)__pxcptinfoptrs(), *old_ep;
166
167 old_ep = *ep;
168 *ep = except;
169 sighandlers[SIGILL] = SIG_DFL;
170 handler(SIGILL);
171 *ep = old_ep;
172 }
173 ret = EXCEPTION_CONTINUE_EXECUTION;
174 }
175 break;
176 }
177 return ret;
178 }
179
msvcrt_init_signals(void)180 void msvcrt_init_signals(void)
181 {
182 SetConsoleCtrlHandler(msvcrt_console_handler, TRUE);
183 }
184
msvcrt_free_signals(void)185 void msvcrt_free_signals(void)
186 {
187 SetConsoleCtrlHandler(msvcrt_console_handler, FALSE);
188 }
189
190 #ifndef __REACTOS__ // Own implementation in signal/signal.c
191 /*********************************************************************
192 * signal (MSVCRT.@)
193 * Some signals may never be generated except through an explicit call to
194 * raise.
195 */
signal(int sig,__sighandler_t func)196 __sighandler_t CDECL signal(int sig, __sighandler_t func)
197 {
198 __sighandler_t ret = SIG_ERR;
199
200 TRACE("(%d, %p)\n", sig, func);
201
202 if (func == SIG_ERR) return SIG_ERR;
203
204 switch (sig)
205 {
206 /* Cases handled internally. Note SIGTERM is never generated by Windows,
207 * so we effectively mask it.
208 */
209 case SIGABRT:
210 case SIGFPE:
211 case SIGILL:
212 case SIGSEGV:
213 case SIGINT:
214 case SIGTERM:
215 case SIGBREAK:
216 ret = sighandlers[sig];
217 sighandlers[sig] = func;
218 break;
219 default:
220 ret = SIG_ERR;
221 }
222 return ret;
223 }
224
225 /*********************************************************************
226 * raise (MSVCRT.@)
227 */
raise(int sig)228 int CDECL raise(int sig)
229 {
230 __sighandler_t handler;
231
232 TRACE("(%d)\n", sig);
233
234 switch (sig)
235 {
236 case SIGFPE:
237 case SIGILL:
238 case SIGSEGV:
239 handler = sighandlers[sig];
240 if (handler == SIG_DFL) _exit(3);
241 if (handler != SIG_IGN)
242 {
243 EXCEPTION_POINTERS **ep = (EXCEPTION_POINTERS**)__pxcptinfoptrs(), *old_ep;
244
245 sighandlers[sig] = SIG_DFL;
246
247 old_ep = *ep;
248 *ep = NULL;
249 if (sig == SIGFPE)
250 ((float_handler)handler)(sig, _FPE_EXPLICITGEN);
251 else
252 handler(sig);
253 *ep = old_ep;
254 }
255 break;
256 case SIGABRT:
257 case SIGINT:
258 case SIGTERM:
259 case SIGBREAK:
260 handler = sighandlers[sig];
261 if (handler == SIG_DFL) _exit(3);
262 if (handler != SIG_IGN)
263 {
264 sighandlers[sig] = SIG_DFL;
265 handler(sig);
266 }
267 break;
268 default:
269 return -1;
270 }
271 return 0;
272 }
273 #endif // __REACTOS__
274
275 /*********************************************************************
276 * _XcptFilter (MSVCRT.@)
277 */
_XcptFilter(NTSTATUS ex,PEXCEPTION_POINTERS ptr)278 int CDECL _XcptFilter(NTSTATUS ex, PEXCEPTION_POINTERS ptr)
279 {
280 TRACE("(%08x,%p)\n", ex, ptr);
281 /* I assume ptr->ExceptionRecord->ExceptionCode is the same as ex */
282 return msvcrt_exception_filter(ptr);
283 }
284
285 #ifndef __REACTOS__
286 /*********************************************************************
287 * _abnormal_termination (MSVCRT.@)
288 */
__intrinsic_abnormal_termination(void)289 int CDECL __intrinsic_abnormal_termination(void)
290 {
291 FIXME("(void)stub\n");
292 return 0;
293 }
294 #endif /* __REACTOS__ */
295
296 /******************************************************************
297 * __uncaught_exception (MSVCRT.@)
298 */
__uncaught_exception(void)299 BOOL CDECL __uncaught_exception(void)
300 {
301 return msvcrt_get_thread_data()->processing_throw != 0;
302 }
303
304 #if _MSVCR_VER>=70 && _MSVCR_VER<=71
305
306 /*********************************************************************
307 * _set_security_error_handler (MSVCR70.@)
308 */
_set_security_error_handler(MSVCRT_security_error_handler handler)309 MSVCRT_security_error_handler CDECL _set_security_error_handler(
310 MSVCRT_security_error_handler handler )
311 {
312 MSVCRT_security_error_handler old = security_error_handler;
313
314 TRACE("(%p)\n", handler);
315
316 security_error_handler = handler;
317 return old;
318 }
319
320 /*********************************************************************
321 * __security_error_handler (MSVCR70.@)
322 */
__security_error_handler(int code,void * data)323 void CDECL __security_error_handler(int code, void *data)
324 {
325 if(security_error_handler)
326 security_error_handler(code, data);
327 else
328 FIXME("(%d, %p) stub\n", code, data);
329
330 _exit(3);
331 }
332
333 #endif /* _MSVCR_VER>=70 && _MSVCR_VER<=71 */
334
335 #if _MSVCR_VER>=110
336 /*********************************************************************
337 * __crtSetUnhandledExceptionFilter (MSVCR110.@)
338 */
__crtSetUnhandledExceptionFilter(LPTOP_LEVEL_EXCEPTION_FILTER filter)339 LPTOP_LEVEL_EXCEPTION_FILTER CDECL __crtSetUnhandledExceptionFilter(LPTOP_LEVEL_EXCEPTION_FILTER filter)
340 {
341 return SetUnhandledExceptionFilter(filter);
342 }
343 #endif
344
345 /*********************************************************************
346 * _CreateFrameInfo (MSVCR80.@)
347 */
_CreateFrameInfo(frame_info * fi,void * obj)348 frame_info* CDECL _CreateFrameInfo(frame_info *fi, void *obj)
349 {
350 thread_data_t *data = msvcrt_get_thread_data();
351
352 TRACE("(%p, %p)\n", fi, obj);
353
354 fi->next = data->frame_info_head;
355 data->frame_info_head = fi;
356 fi->object = obj;
357 return fi;
358 }
359
360 /*********************************************************************
361 * _FindAndUnlinkFrame (MSVCR80.@)
362 */
_FindAndUnlinkFrame(frame_info * fi)363 void CDECL _FindAndUnlinkFrame(frame_info *fi)
364 {
365 thread_data_t *data = msvcrt_get_thread_data();
366 frame_info *cur = data->frame_info_head;
367
368 TRACE("(%p)\n", fi);
369
370 if (cur == fi)
371 {
372 data->frame_info_head = cur->next;
373 return;
374 }
375
376 for (; cur->next; cur = cur->next)
377 {
378 if (cur->next == fi)
379 {
380 cur->next = fi->next;
381 return;
382 }
383 }
384
385 ERR("frame not found, native crashes in this case\n");
386 }
387
388 /*********************************************************************
389 * _IsExceptionObjectToBeDestroyed (MSVCR80.@)
390 */
_IsExceptionObjectToBeDestroyed(const void * obj)391 BOOL __cdecl _IsExceptionObjectToBeDestroyed(const void *obj)
392 {
393 frame_info *cur;
394
395 TRACE( "%p\n", obj );
396
397 for (cur = msvcrt_get_thread_data()->frame_info_head; cur; cur = cur->next)
398 {
399 if (cur->object == obj)
400 return FALSE;
401 }
402
403 return TRUE;
404 }
405
406 /*********************************************************************
407 * __DestructExceptionObject (MSVCRT.@)
408 */
__DestructExceptionObject(EXCEPTION_RECORD * rec)409 void CDECL __DestructExceptionObject(EXCEPTION_RECORD *rec)
410 {
411 cxx_exception_type *info = (cxx_exception_type*) rec->ExceptionInformation[2];
412 void *object = (void*)rec->ExceptionInformation[1];
413
414 TRACE("(%p)\n", rec);
415
416 if (rec->ExceptionCode != CXX_EXCEPTION) return;
417 #ifndef __x86_64__
418 if (rec->NumberParameters != 3) return;
419 #else
420 if (rec->NumberParameters != 4) return;
421 #endif
422 if (rec->ExceptionInformation[0] < CXX_FRAME_MAGIC_VC6 ||
423 rec->ExceptionInformation[0] > CXX_FRAME_MAGIC_VC8) return;
424
425 if (!info || !info->destructor)
426 return;
427
428 #if defined(__i386__)
429 #ifdef _MSC_VER
430 ((void(__fastcall*)(void*))info->destructor)(object);
431 #else
432 __asm__ __volatile__("call *%0" : : "r" (info->destructor), "c" (object) : "eax", "edx", "memory");
433 #endif
434 #elif defined(__x86_64__)
435 ((void (__cdecl*)(void*))(info->destructor+rec->ExceptionInformation[3]))(object);
436 #else
437 ((void (__cdecl*)(void*))info->destructor)(object);
438 #endif
439 }
440
441 /*********************************************************************
442 * __CxxRegisterExceptionObject (MSVCRT.@)
443 */
__CxxRegisterExceptionObject(EXCEPTION_POINTERS * ep,cxx_frame_info * frame_info)444 BOOL CDECL __CxxRegisterExceptionObject(EXCEPTION_POINTERS *ep, cxx_frame_info *frame_info)
445 {
446 thread_data_t *data = msvcrt_get_thread_data();
447
448 TRACE("(%p, %p)\n", ep, frame_info);
449
450 if (!ep || !ep->ExceptionRecord)
451 {
452 frame_info->rec = (void*)-1;
453 frame_info->context = (void*)-1;
454 return TRUE;
455 }
456
457 frame_info->rec = data->exc_record;
458 frame_info->context = data->ctx_record;
459 data->exc_record = ep->ExceptionRecord;
460 data->ctx_record = ep->ContextRecord;
461 _CreateFrameInfo(&frame_info->frame_info, (void*)ep->ExceptionRecord->ExceptionInformation[1]);
462 return TRUE;
463 }
464
465 /*********************************************************************
466 * __CxxUnregisterExceptionObject (MSVCRT.@)
467 */
__CxxUnregisterExceptionObject(cxx_frame_info * frame_info,BOOL in_use)468 void CDECL __CxxUnregisterExceptionObject(cxx_frame_info *frame_info, BOOL in_use)
469 {
470 thread_data_t *data = msvcrt_get_thread_data();
471
472 TRACE("(%p)\n", frame_info);
473
474 if(frame_info->rec == (void*)-1)
475 return;
476
477 _FindAndUnlinkFrame(&frame_info->frame_info);
478 if(data->exc_record->ExceptionCode == CXX_EXCEPTION && !in_use
479 && _IsExceptionObjectToBeDestroyed((void*)data->exc_record->ExceptionInformation[1]))
480 __DestructExceptionObject(data->exc_record);
481 data->exc_record = frame_info->rec;
482 data->ctx_record = frame_info->context;
483 }
484
485 struct __std_exception_data {
486 char *what;
487 char dofree;
488 };
489
490 #if _MSVCR_VER>=140
491
492 /*********************************************************************
493 * __std_exception_copy (UCRTBASE.@)
494 */
__std_exception_copy(const struct __std_exception_data * src,struct __std_exception_data * dst)495 void CDECL __std_exception_copy(const struct __std_exception_data *src,
496 struct __std_exception_data *dst)
497 {
498 TRACE("(%p %p)\n", src, dst);
499
500 if(src->dofree && src->what) {
501 dst->what = _strdup(src->what);
502 dst->dofree = 1;
503 } else {
504 dst->what = src->what;
505 dst->dofree = 0;
506 }
507 }
508
509 /*********************************************************************
510 * __std_exception_destroy (UCRTBASE.@)
511 */
__std_exception_destroy(struct __std_exception_data * data)512 void CDECL __std_exception_destroy(struct __std_exception_data *data)
513 {
514 TRACE("(%p)\n", data);
515
516 if(data->dofree)
517 free(data->what);
518 data->what = NULL;
519 data->dofree = 0;
520 }
521
522 /*********************************************************************
523 * __current_exception (UCRTBASE.@)
524 */
__current_exception(void)525 void** CDECL __current_exception(void)
526 {
527 TRACE("()\n");
528 return (void**)&msvcrt_get_thread_data()->exc_record;
529 }
530
531 /*********************************************************************
532 * __current_exception_context (UCRTBASE.@)
533 */
__current_exception_context(void)534 void** CDECL __current_exception_context(void)
535 {
536 TRACE("()\n");
537 return (void**)&msvcrt_get_thread_data()->ctx_record;
538 }
539
540 /*********************************************************************
541 * __processing_throw (UCRTBASE.@)
542 */
__processing_throw(void)543 int* CDECL __processing_throw(void)
544 {
545 TRACE("()\n");
546 return &msvcrt_get_thread_data()->processing_throw;
547 }
548
549 #endif /* _MSVCR_VER>=140 */
550