2 * NT exception handling routines
4 * Copyright 1999 Turchanov Sergey
5 * Copyright 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 #include "wine/port.h"
32 #include "wine/exception.h"
33 #include "wine/server.h"
34 #include "wine/list.h"
35 #include "wine/debug.h"
37 #include "ntdll_misc.h"
39 WINE_DEFAULT_DEBUG_CHANNEL(seh);
41 /* Exception record for handling exceptions happening inside exception handlers */
44 EXCEPTION_REGISTRATION_RECORD frame;
45 EXCEPTION_REGISTRATION_RECORD *prevFrame;
51 PVECTORED_EXCEPTION_HANDLER func;
54 static struct list vectored_handlers = LIST_INIT(vectored_handlers);
56 static RTL_CRITICAL_SECTION vectored_handlers_section;
57 static RTL_CRITICAL_SECTION_DEBUG critsect_debug =
59 0, 0, &vectored_handlers_section,
60 { &critsect_debug.ProcessLocksList, &critsect_debug.ProcessLocksList },
61 0, 0, { 0, (DWORD)(__FILE__ ": vectored_handlers_section") }
63 static RTL_CRITICAL_SECTION vectored_handlers_section = { &critsect_debug, -1, 0, 0, 0, 0 };
66 # define GET_IP(context) ((LPVOID)(context)->Eip)
67 #elif defined(__sparc__)
68 # define GET_IP(context) ((LPVOID)(context)->pc)
69 #elif defined(__powerpc__)
70 # define GET_IP(context) ((LPVOID)(context)->Iar)
71 #elif defined(__ALPHA__)
72 # define GET_IP(context) ((LPVOID)(context)->Fir)
74 # error You must define GET_IP for this CPU
78 /*******************************************************************
81 * Handler for exceptions happening inside a handler.
83 static DWORD EXC_RaiseHandler( EXCEPTION_RECORD *rec, EXCEPTION_REGISTRATION_RECORD *frame,
84 CONTEXT *context, EXCEPTION_REGISTRATION_RECORD **dispatcher )
86 if (rec->ExceptionFlags & (EH_UNWINDING | EH_EXIT_UNWIND))
87 return ExceptionContinueSearch;
88 /* We shouldn't get here so we store faulty frame in dispatcher */
89 *dispatcher = ((EXC_NESTED_FRAME*)frame)->prevFrame;
90 return ExceptionNestedException;
94 /*******************************************************************
97 * Handler for exceptions happening inside an unwind handler.
99 static DWORD EXC_UnwindHandler( EXCEPTION_RECORD *rec, EXCEPTION_REGISTRATION_RECORD *frame,
100 CONTEXT *context, EXCEPTION_REGISTRATION_RECORD **dispatcher )
102 if (!(rec->ExceptionFlags & (EH_UNWINDING | EH_EXIT_UNWIND)))
103 return ExceptionContinueSearch;
104 /* We shouldn't get here so we store faulty frame in dispatcher */
105 *dispatcher = ((EXC_NESTED_FRAME*)frame)->prevFrame;
106 return ExceptionCollidedUnwind;
110 /*******************************************************************
113 * Call an exception handler, setting up an exception frame to catch exceptions
114 * happening during the handler execution.
115 * Please do not change the first 4 parameters order in any way - some exceptions handlers
116 * rely on Base Pointer (EBP) to have a fixed position related to the exception frame
118 static DWORD EXC_CallHandler( EXCEPTION_RECORD *record, EXCEPTION_REGISTRATION_RECORD *frame,
119 CONTEXT *context, EXCEPTION_REGISTRATION_RECORD **dispatcher,
120 PEXCEPTION_HANDLER handler, PEXCEPTION_HANDLER nested_handler)
122 EXC_NESTED_FRAME newframe;
125 newframe.frame.Handler = nested_handler;
126 newframe.prevFrame = frame;
127 __wine_push_frame( &newframe.frame );
128 TRACE( "calling handler at %p code=%lx flags=%lx\n",
129 handler, record->ExceptionCode, record->ExceptionFlags );
130 ret = handler( record, frame, context, dispatcher );
131 TRACE( "handler returned %lx\n", ret );
132 __wine_pop_frame( &newframe.frame );
137 /**********************************************************************
140 * Send an EXCEPTION_DEBUG_EVENT event to the debugger.
142 static int send_debug_event( EXCEPTION_RECORD *rec, int first_chance, CONTEXT *context )
147 if (!NtCurrentTeb()->Peb->BeingDebugged) return 0; /* no debugger present */
149 SERVER_START_REQ( queue_exception_event )
151 req->first = first_chance;
152 wine_server_add_data( req, context, sizeof(*context) );
153 wine_server_add_data( req, rec, sizeof(*rec) );
154 if (!wine_server_call( req )) handle = reply->handle;
157 if (!handle) return 0;
159 /* No need to wait on the handle since the process gets suspended
160 * once the event is passed to the debugger, so when we get back
161 * here the event has been continued already.
163 SERVER_START_REQ( get_exception_status )
165 req->handle = handle;
166 wine_server_set_reply( req, context, sizeof(*context) );
167 wine_server_call( req );
176 /**********************************************************************
177 * call_vectored_handlers
179 * Call the vectored handlers chain.
181 static LONG call_vectored_handlers( EXCEPTION_RECORD *rec, CONTEXT *context )
184 LONG ret = EXCEPTION_CONTINUE_SEARCH;
185 EXCEPTION_POINTERS except_ptrs;
187 except_ptrs.ExceptionRecord = rec;
188 except_ptrs.ContextRecord = context;
190 RtlEnterCriticalSection( &vectored_handlers_section );
191 LIST_FOR_EACH( ptr, &vectored_handlers )
193 VECTORED_HANDLER *handler = LIST_ENTRY( ptr, VECTORED_HANDLER, entry );
194 ret = handler->func( &except_ptrs );
195 if (ret == EXCEPTION_CONTINUE_EXECUTION) break;
197 RtlLeaveCriticalSection( &vectored_handlers_section );
202 /*******************************************************************
203 * EXC_DefaultHandling
205 * Default handling for exceptions. Called when we didn't find a suitable handler.
207 static void EXC_DefaultHandling( EXCEPTION_RECORD *rec, CONTEXT *context )
209 if (send_debug_event( rec, FALSE, context ) == DBG_CONTINUE) return; /* continue execution */
211 if (rec->ExceptionFlags & EH_STACK_INVALID)
212 ERR("Exception frame is not in stack limits => unable to dispatch exception.\n");
213 else if (rec->ExceptionCode == STATUS_NONCONTINUABLE_EXCEPTION)
214 ERR("Process attempted to continue execution after noncontinuable exception.\n");
216 ERR("Unhandled exception code %lx flags %lx addr %p\n",
217 rec->ExceptionCode, rec->ExceptionFlags, rec->ExceptionAddress );
218 NtTerminateProcess( NtCurrentProcess(), 1 );
222 /***********************************************************************
223 * RtlRaiseException (NTDLL.@)
225 void WINAPI __regs_RtlRaiseException( EXCEPTION_RECORD *rec, CONTEXT *context )
227 EXCEPTION_REGISTRATION_RECORD *frame, *dispatch, *nested_frame;
228 EXCEPTION_RECORD newrec;
231 TRACE( "code=%lx flags=%lx addr=%p\n", rec->ExceptionCode, rec->ExceptionFlags, rec->ExceptionAddress );
232 for (c=0; c<rec->NumberParameters; c++) TRACE(" info[%ld]=%08lx\n", c, rec->ExceptionInformation[c]);
233 if (rec->ExceptionCode == EXCEPTION_WINE_STUB)
235 if (HIWORD(rec->ExceptionInformation[1]))
236 MESSAGE( "wine: Call from %p to unimplemented function %s.%s, aborting\n",
237 rec->ExceptionAddress,
238 (char*)rec->ExceptionInformation[0], (char*)rec->ExceptionInformation[1] );
240 MESSAGE( "wine: Call from %p to unimplemented function %s.%ld, aborting\n",
241 rec->ExceptionAddress,
242 (char*)rec->ExceptionInformation[0], rec->ExceptionInformation[1] );
247 TRACE(" eax=%08lx ebx=%08lx ecx=%08lx edx=%08lx esi=%08lx edi=%08lx\n",
248 context->Eax, context->Ebx, context->Ecx,
249 context->Edx, context->Esi, context->Edi );
250 TRACE(" ebp=%08lx esp=%08lx cs=%04lx ds=%04lx es=%04lx fs=%04lx gs=%04lx flags=%08lx\n",
251 context->Ebp, context->Esp, context->SegCs, context->SegDs,
252 context->SegEs, context->SegFs, context->SegGs, context->EFlags );
256 if (send_debug_event( rec, TRUE, context ) == DBG_CONTINUE) return; /* continue execution */
258 if (call_vectored_handlers( rec, context ) == EXCEPTION_CONTINUE_EXECUTION) return;
260 frame = NtCurrentTeb()->Tib.ExceptionList;
262 while (frame != (EXCEPTION_REGISTRATION_RECORD*)~0UL)
264 /* Check frame address */
265 if (((void*)frame < NtCurrentTeb()->Tib.StackLimit) ||
266 ((void*)(frame+1) > NtCurrentTeb()->Tib.StackBase) ||
267 (ULONG_PTR)frame & 3)
269 rec->ExceptionFlags |= EH_STACK_INVALID;
274 res = EXC_CallHandler( rec, frame, context, &dispatch, frame->Handler, EXC_RaiseHandler );
275 if (frame == nested_frame)
277 /* no longer nested */
279 rec->ExceptionFlags &= ~EH_NESTED_CALL;
284 case ExceptionContinueExecution:
285 if (!(rec->ExceptionFlags & EH_NONCONTINUABLE)) return;
286 newrec.ExceptionCode = STATUS_NONCONTINUABLE_EXCEPTION;
287 newrec.ExceptionFlags = EH_NONCONTINUABLE;
288 newrec.ExceptionRecord = rec;
289 newrec.NumberParameters = 0;
290 RtlRaiseException( &newrec ); /* never returns */
292 case ExceptionContinueSearch:
294 case ExceptionNestedException:
295 if (nested_frame < dispatch) nested_frame = dispatch;
296 rec->ExceptionFlags |= EH_NESTED_CALL;
299 newrec.ExceptionCode = STATUS_INVALID_DISPOSITION;
300 newrec.ExceptionFlags = EH_NONCONTINUABLE;
301 newrec.ExceptionRecord = rec;
302 newrec.NumberParameters = 0;
303 RtlRaiseException( &newrec ); /* never returns */
308 EXC_DefaultHandling( rec, context );
311 /**********************************************************************/
313 #ifdef DEFINE_REGS_ENTRYPOINT
314 DEFINE_REGS_ENTRYPOINT( RtlRaiseException, 4, 4 );
316 void WINAPI RtlRaiseException( EXCEPTION_RECORD *rec )
319 memset( &context, 0, sizeof(context) );
320 __regs_RtlRaiseException( rec, &context );
325 /*******************************************************************
326 * RtlUnwind (NTDLL.@)
328 void WINAPI __regs_RtlUnwind( EXCEPTION_REGISTRATION_RECORD* pEndFrame, PVOID unusedEip,
329 PEXCEPTION_RECORD pRecord, PVOID returnEax, CONTEXT *context )
331 EXCEPTION_RECORD record, newrec;
332 EXCEPTION_REGISTRATION_RECORD *frame, *dispatch;
335 context->Eax = (DWORD)returnEax;
338 /* build an exception record, if we do not have one */
341 record.ExceptionCode = STATUS_UNWIND;
342 record.ExceptionFlags = 0;
343 record.ExceptionRecord = NULL;
344 record.ExceptionAddress = GET_IP(context);
345 record.NumberParameters = 0;
349 pRecord->ExceptionFlags |= EH_UNWINDING | (pEndFrame ? 0 : EH_EXIT_UNWIND);
351 TRACE( "code=%lx flags=%lx\n", pRecord->ExceptionCode, pRecord->ExceptionFlags );
353 /* get chain of exception frames */
354 frame = NtCurrentTeb()->Tib.ExceptionList;
355 while ((frame != (EXCEPTION_REGISTRATION_RECORD*)~0UL) && (frame != pEndFrame))
357 /* Check frame address */
358 if (pEndFrame && (frame > pEndFrame))
360 newrec.ExceptionCode = STATUS_INVALID_UNWIND_TARGET;
361 newrec.ExceptionFlags = EH_NONCONTINUABLE;
362 newrec.ExceptionRecord = pRecord;
363 newrec.NumberParameters = 0;
364 RtlRaiseException( &newrec ); /* never returns */
366 if (((void*)frame < NtCurrentTeb()->Tib.StackLimit) ||
367 ((void*)(frame+1) > NtCurrentTeb()->Tib.StackBase) ||
370 newrec.ExceptionCode = STATUS_BAD_STACK;
371 newrec.ExceptionFlags = EH_NONCONTINUABLE;
372 newrec.ExceptionRecord = pRecord;
373 newrec.NumberParameters = 0;
374 RtlRaiseException( &newrec ); /* never returns */
378 switch(EXC_CallHandler( pRecord, frame, context, &dispatch,
379 frame->Handler, EXC_UnwindHandler ))
381 case ExceptionContinueSearch:
383 case ExceptionCollidedUnwind:
387 newrec.ExceptionCode = STATUS_INVALID_DISPOSITION;
388 newrec.ExceptionFlags = EH_NONCONTINUABLE;
389 newrec.ExceptionRecord = pRecord;
390 newrec.NumberParameters = 0;
391 RtlRaiseException( &newrec ); /* never returns */
394 frame = __wine_pop_frame( frame );
398 /**********************************************************************/
400 #ifdef DEFINE_REGS_ENTRYPOINT
401 DEFINE_REGS_ENTRYPOINT( RtlUnwind, 16, 16 );
403 void WINAPI RtlUnwind( PVOID pEndFrame, PVOID unusedEip,
404 PEXCEPTION_RECORD pRecord, PVOID returnEax )
407 memset( &context, 0, sizeof(context) );
408 __regs_RtlUnwind( pEndFrame, unusedEip, pRecord, returnEax, &context );
413 /*******************************************************************
414 * NtRaiseException (NTDLL.@)
416 void WINAPI __regs_NtRaiseException( EXCEPTION_RECORD *rec, CONTEXT *ctx,
417 BOOL first, CONTEXT *context )
419 __regs_RtlRaiseException( rec, ctx );
423 #ifdef DEFINE_REGS_ENTRYPOINT
424 DEFINE_REGS_ENTRYPOINT( NtRaiseException, 12, 12 );
426 void WINAPI NtRaiseException( EXCEPTION_RECORD *rec, CONTEXT *ctx, BOOL first )
429 memset( &context, 0, sizeof(context) );
430 __regs_NtRaiseException( rec, ctx, first, &context );
435 /***********************************************************************
436 * RtlRaiseStatus (NTDLL.@)
438 * Raise an exception with ExceptionCode = status
440 void WINAPI RtlRaiseStatus( NTSTATUS status )
442 EXCEPTION_RECORD ExceptionRec;
444 ExceptionRec.ExceptionCode = status;
445 ExceptionRec.ExceptionFlags = EH_NONCONTINUABLE;
446 ExceptionRec.ExceptionRecord = NULL;
447 ExceptionRec.NumberParameters = 0;
448 RtlRaiseException( &ExceptionRec );
452 /*******************************************************************
453 * RtlAddVectoredExceptionHandler (NTDLL.@)
455 PVOID WINAPI RtlAddVectoredExceptionHandler( ULONG first, PVECTORED_EXCEPTION_HANDLER func )
457 VECTORED_HANDLER *handler = RtlAllocateHeap( GetProcessHeap(), 0, sizeof(*handler) );
460 handler->func = func;
461 RtlEnterCriticalSection( &vectored_handlers_section );
462 if (first) list_add_head( &vectored_handlers, &handler->entry );
463 else list_add_tail( &vectored_handlers, &handler->entry );
464 RtlLeaveCriticalSection( &vectored_handlers_section );
470 /*******************************************************************
471 * RtlRemoveVectoredExceptionHandler (NTDLL.@)
473 ULONG WINAPI RtlRemoveVectoredExceptionHandler( PVOID handler )
478 RtlEnterCriticalSection( &vectored_handlers_section );
479 LIST_FOR_EACH( ptr, &vectored_handlers )
481 VECTORED_HANDLER *curr_handler = LIST_ENTRY( ptr, VECTORED_HANDLER, entry );
482 if (curr_handler == handler)
489 RtlLeaveCriticalSection( &vectored_handlers_section );
490 if (ret) RtlFreeHeap( GetProcessHeap(), 0, handler );
495 /*************************************************************
496 * __wine_exception_handler (NTDLL.@)
498 * Exception handler for exception blocks declared in Wine code.
500 DWORD __wine_exception_handler( EXCEPTION_RECORD *record, EXCEPTION_REGISTRATION_RECORD *frame,
501 CONTEXT *context, EXCEPTION_REGISTRATION_RECORD **pdispatcher )
503 __WINE_FRAME *wine_frame = (__WINE_FRAME *)frame;
505 if (record->ExceptionFlags & (EH_UNWINDING | EH_EXIT_UNWIND | EH_NESTED_CALL))
506 return ExceptionContinueSearch;
507 if (wine_frame->u.filter)
509 EXCEPTION_POINTERS ptrs;
510 ptrs.ExceptionRecord = record;
511 ptrs.ContextRecord = context;
512 switch(wine_frame->u.filter( &ptrs ))
514 case EXCEPTION_CONTINUE_SEARCH:
515 return ExceptionContinueSearch;
516 case EXCEPTION_CONTINUE_EXECUTION:
517 return ExceptionContinueExecution;
518 case EXCEPTION_EXECUTE_HANDLER:
521 MESSAGE( "Invalid return value from exception filter\n" );
525 /* hack to make GetExceptionCode() work in handler */
526 wine_frame->ExceptionCode = record->ExceptionCode;
527 wine_frame->ExceptionRecord = wine_frame;
529 RtlUnwind( frame, 0, record, 0 );
530 __wine_pop_frame( frame );
531 siglongjmp( wine_frame->jmp, 1 );
535 /*************************************************************
536 * __wine_finally_handler (NTDLL.@)
538 * Exception handler for try/finally blocks declared in Wine code.
540 DWORD __wine_finally_handler( EXCEPTION_RECORD *record, EXCEPTION_REGISTRATION_RECORD *frame,
541 CONTEXT *context, EXCEPTION_REGISTRATION_RECORD **pdispatcher )
543 if (record->ExceptionFlags & (EH_UNWINDING | EH_EXIT_UNWIND))
545 __WINE_FRAME *wine_frame = (__WINE_FRAME *)frame;
546 wine_frame->u.finally_func( FALSE );
548 return ExceptionContinueSearch;