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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
23 #include "wine/port.h"
30 #define WIN32_NO_STATUS
33 #include "wine/exception.h"
34 #include "wine/server.h"
35 #include "wine/list.h"
36 #include "wine/debug.h"
38 #include "ntdll_misc.h"
40 WINE_DEFAULT_DEBUG_CHANNEL(seh);
42 /* Exception record for handling exceptions happening inside exception handlers */
45 EXCEPTION_REGISTRATION_RECORD frame;
46 EXCEPTION_REGISTRATION_RECORD *prevFrame;
52 PVECTORED_EXCEPTION_HANDLER func;
55 static struct list vectored_handlers = LIST_INIT(vectored_handlers);
57 static RTL_CRITICAL_SECTION vectored_handlers_section;
58 static RTL_CRITICAL_SECTION_DEBUG critsect_debug =
60 0, 0, &vectored_handlers_section,
61 { &critsect_debug.ProcessLocksList, &critsect_debug.ProcessLocksList },
62 0, 0, { (DWORD_PTR)(__FILE__ ": vectored_handlers_section") }
64 static RTL_CRITICAL_SECTION vectored_handlers_section = { &critsect_debug, -1, 0, 0, 0, 0 };
67 # define GET_IP(context) ((LPVOID)(context)->Eip)
68 #elif defined(__sparc__)
69 # define GET_IP(context) ((LPVOID)(context)->pc)
70 #elif defined(__powerpc__)
71 # define GET_IP(context) ((LPVOID)(context)->Iar)
72 #elif defined(__ALPHA__)
73 # define GET_IP(context) ((LPVOID)(context)->Fir)
74 #elif defined(__x86_64__)
75 # define GET_IP(context) ((LPVOID)(context)->Rip)
77 # error You must define GET_IP for this CPU
80 /*******************************************************************
83 * Handler for exceptions happening inside a handler.
85 static DWORD EXC_RaiseHandler( EXCEPTION_RECORD *rec, EXCEPTION_REGISTRATION_RECORD *frame,
86 CONTEXT *context, EXCEPTION_REGISTRATION_RECORD **dispatcher )
88 if (rec->ExceptionFlags & (EH_UNWINDING | EH_EXIT_UNWIND))
89 return ExceptionContinueSearch;
90 /* We shouldn't get here so we store faulty frame in dispatcher */
91 *dispatcher = ((EXC_NESTED_FRAME*)frame)->prevFrame;
92 return ExceptionNestedException;
96 /*******************************************************************
99 * Handler for exceptions happening inside an unwind handler.
101 static DWORD EXC_UnwindHandler( EXCEPTION_RECORD *rec, EXCEPTION_REGISTRATION_RECORD *frame,
102 CONTEXT *context, EXCEPTION_REGISTRATION_RECORD **dispatcher )
104 if (!(rec->ExceptionFlags & (EH_UNWINDING | EH_EXIT_UNWIND)))
105 return ExceptionContinueSearch;
106 /* We shouldn't get here so we store faulty frame in dispatcher */
107 *dispatcher = ((EXC_NESTED_FRAME*)frame)->prevFrame;
108 return ExceptionCollidedUnwind;
112 /*******************************************************************
115 * Call an exception handler, setting up an exception frame to catch exceptions
116 * happening during the handler execution.
118 * For i386 this function is implemented in assembler in signal_i386.c.
121 static DWORD EXC_CallHandler( EXCEPTION_RECORD *record, EXCEPTION_REGISTRATION_RECORD *frame,
122 CONTEXT *context, EXCEPTION_REGISTRATION_RECORD **dispatcher,
123 PEXCEPTION_HANDLER handler, PEXCEPTION_HANDLER nested_handler)
125 EXC_NESTED_FRAME newframe;
128 newframe.frame.Handler = nested_handler;
129 newframe.prevFrame = frame;
130 __wine_push_frame( &newframe.frame );
131 ret = handler( record, frame, context, dispatcher );
132 __wine_pop_frame( &newframe.frame );
136 /* in signal_i386.c */
137 extern DWORD EXC_CallHandler( EXCEPTION_RECORD *record, EXCEPTION_REGISTRATION_RECORD *frame,
138 CONTEXT *context, EXCEPTION_REGISTRATION_RECORD **dispatcher,
139 PEXCEPTION_HANDLER handler, PEXCEPTION_HANDLER nested_handler);
142 /**********************************************************************
145 * Wait until the thread is no longer suspended.
147 void wait_suspend( CONTEXT *context )
149 LARGE_INTEGER timeout;
151 /* store the context we got at suspend time */
152 SERVER_START_REQ( set_thread_context )
154 req->handle = GetCurrentThread();
155 req->flags = CONTEXT_FULL;
157 wine_server_add_data( req, context, sizeof(*context) );
158 wine_server_call( req );
162 /* wait with 0 timeout, will only return once the thread is no longer suspended */
163 timeout.QuadPart = 0;
164 NTDLL_wait_for_multiple_objects( 0, NULL, 0, &timeout, 0 );
166 /* retrieve the new context */
167 SERVER_START_REQ( get_thread_context )
169 req->handle = GetCurrentThread();
170 req->flags = CONTEXT_FULL;
172 wine_server_set_reply( req, context, sizeof(*context) );
173 wine_server_call( req );
179 /**********************************************************************
182 * Send an EXCEPTION_DEBUG_EVENT event to the debugger.
184 static NTSTATUS send_debug_event( EXCEPTION_RECORD *rec, int first_chance, CONTEXT *context )
189 if (!NtCurrentTeb()->Peb->BeingDebugged) return 0; /* no debugger present */
191 SERVER_START_REQ( queue_exception_event )
193 req->first = first_chance;
194 wine_server_add_data( req, context, sizeof(*context) );
195 wine_server_add_data( req, rec, sizeof(*rec) );
196 if (!wine_server_call( req )) handle = reply->handle;
199 if (!handle) return 0;
201 NTDLL_wait_for_multiple_objects( 1, &handle, 0, NULL, 0 );
203 SERVER_START_REQ( get_exception_status )
205 req->handle = handle;
206 wine_server_set_reply( req, context, sizeof(*context) );
207 ret = wine_server_call( req );
214 /**********************************************************************
215 * call_vectored_handlers
217 * Call the vectored handlers chain.
219 static LONG call_vectored_handlers( EXCEPTION_RECORD *rec, CONTEXT *context )
222 LONG ret = EXCEPTION_CONTINUE_SEARCH;
223 EXCEPTION_POINTERS except_ptrs;
225 except_ptrs.ExceptionRecord = rec;
226 except_ptrs.ContextRecord = context;
228 RtlEnterCriticalSection( &vectored_handlers_section );
229 LIST_FOR_EACH( ptr, &vectored_handlers )
231 VECTORED_HANDLER *handler = LIST_ENTRY( ptr, VECTORED_HANDLER, entry );
232 ret = handler->func( &except_ptrs );
233 if (ret == EXCEPTION_CONTINUE_EXECUTION) break;
235 RtlLeaveCriticalSection( &vectored_handlers_section );
240 /**********************************************************************
241 * call_stack_handlers
243 * Call the stack handlers chain.
245 static NTSTATUS call_stack_handlers( EXCEPTION_RECORD *rec, CONTEXT *context )
247 EXCEPTION_REGISTRATION_RECORD *frame, *dispatch, *nested_frame;
250 frame = NtCurrentTeb()->Tib.ExceptionList;
252 while (frame != (EXCEPTION_REGISTRATION_RECORD*)~0UL)
254 /* Check frame address */
255 if (((void*)frame < NtCurrentTeb()->Tib.StackLimit) ||
256 ((void*)(frame+1) > NtCurrentTeb()->Tib.StackBase) ||
257 (ULONG_PTR)frame & 3)
259 rec->ExceptionFlags |= EH_STACK_INVALID;
264 TRACE( "calling handler at %p code=%x flags=%x\n",
265 frame->Handler, rec->ExceptionCode, rec->ExceptionFlags );
266 res = EXC_CallHandler( rec, frame, context, &dispatch, frame->Handler, EXC_RaiseHandler );
267 TRACE( "handler at %p returned %x\n", frame->Handler, res );
269 if (frame == nested_frame)
271 /* no longer nested */
273 rec->ExceptionFlags &= ~EH_NESTED_CALL;
278 case ExceptionContinueExecution:
279 if (!(rec->ExceptionFlags & EH_NONCONTINUABLE)) return STATUS_SUCCESS;
280 return STATUS_NONCONTINUABLE_EXCEPTION;
281 case ExceptionContinueSearch:
283 case ExceptionNestedException:
284 if (nested_frame < dispatch) nested_frame = dispatch;
285 rec->ExceptionFlags |= EH_NESTED_CALL;
288 return STATUS_INVALID_DISPOSITION;
292 return STATUS_UNHANDLED_EXCEPTION;
296 /*******************************************************************
299 * Implementation of NtRaiseException.
301 static NTSTATUS raise_exception( EXCEPTION_RECORD *rec, CONTEXT *context, BOOL first_chance )
309 TRACE( "code=%x flags=%x addr=%p\n",
310 rec->ExceptionCode, rec->ExceptionFlags, rec->ExceptionAddress );
311 for (c = 0; c < rec->NumberParameters; c++)
312 TRACE( " info[%d]=%08lx\n", c, rec->ExceptionInformation[c] );
313 if (rec->ExceptionCode == EXCEPTION_WINE_STUB)
315 if (rec->ExceptionInformation[1] >> 16)
316 MESSAGE( "wine: Call from %p to unimplemented function %s.%s, aborting\n",
317 rec->ExceptionAddress,
318 (char*)rec->ExceptionInformation[0], (char*)rec->ExceptionInformation[1] );
320 MESSAGE( "wine: Call from %p to unimplemented function %s.%ld, aborting\n",
321 rec->ExceptionAddress,
322 (char*)rec->ExceptionInformation[0], rec->ExceptionInformation[1] );
327 TRACE(" eax=%08x ebx=%08x ecx=%08x edx=%08x esi=%08x edi=%08x\n",
328 context->Eax, context->Ebx, context->Ecx,
329 context->Edx, context->Esi, context->Edi );
330 TRACE(" ebp=%08x esp=%08x cs=%04x ds=%04x es=%04x fs=%04x gs=%04x flags=%08x\n",
331 context->Ebp, context->Esp, context->SegCs, context->SegDs,
332 context->SegEs, context->SegFs, context->SegGs, context->EFlags );
335 status = send_debug_event( rec, TRUE, context );
336 if (status == DBG_CONTINUE || status == DBG_EXCEPTION_HANDLED)
337 return STATUS_SUCCESS;
339 if (call_vectored_handlers( rec, context ) == EXCEPTION_CONTINUE_EXECUTION)
340 return STATUS_SUCCESS;
342 if ((status = call_stack_handlers( rec, context )) != STATUS_UNHANDLED_EXCEPTION)
346 /* last chance exception */
348 status = send_debug_event( rec, FALSE, context );
349 if (status != DBG_CONTINUE)
351 if (rec->ExceptionFlags & EH_STACK_INVALID)
352 ERR("Exception frame is not in stack limits => unable to dispatch exception.\n");
353 else if (rec->ExceptionCode == STATUS_NONCONTINUABLE_EXCEPTION)
354 ERR("Process attempted to continue execution after noncontinuable exception.\n");
356 ERR("Unhandled exception code %x flags %x addr %p\n",
357 rec->ExceptionCode, rec->ExceptionFlags, rec->ExceptionAddress );
358 NtTerminateProcess( NtCurrentProcess(), 1 );
360 return STATUS_SUCCESS;
364 /*******************************************************************
365 * NtRaiseException (NTDLL.@)
367 NTSTATUS WINAPI NtRaiseException( EXCEPTION_RECORD *rec, CONTEXT *context, BOOL first_chance )
369 NTSTATUS status = raise_exception( rec, context, first_chance );
370 if (status == STATUS_SUCCESS) NtSetContextThread( GetCurrentThread(), context );
374 /***********************************************************************
375 * RtlRaiseException (NTDLL.@)
377 void WINAPI __regs_RtlRaiseException( EXCEPTION_RECORD *rec, CONTEXT *context )
379 NTSTATUS status = raise_exception( rec, context, TRUE );
380 if (status != STATUS_SUCCESS)
382 EXCEPTION_RECORD newrec;
383 newrec.ExceptionCode = status;
384 newrec.ExceptionFlags = EH_NONCONTINUABLE;
385 newrec.ExceptionRecord = rec;
386 newrec.NumberParameters = 0;
387 RtlRaiseException( &newrec ); /* never returns */
391 /**********************************************************************/
393 #ifdef DEFINE_REGS_ENTRYPOINT
394 DEFINE_REGS_ENTRYPOINT( RtlRaiseException, 4, 4 );
396 void WINAPI RtlRaiseException( EXCEPTION_RECORD *rec )
399 memset( &context, 0, sizeof(context) );
400 __regs_RtlRaiseException( rec, &context );
405 /*******************************************************************
406 * RtlUnwind (NTDLL.@)
408 void WINAPI __regs_RtlUnwind( EXCEPTION_REGISTRATION_RECORD* pEndFrame, PVOID unusedEip,
409 PEXCEPTION_RECORD pRecord, PVOID returnEax, CONTEXT *context )
411 EXCEPTION_RECORD record, newrec;
412 EXCEPTION_REGISTRATION_RECORD *frame, *dispatch;
416 context->Eax = (DWORD)returnEax;
419 /* build an exception record, if we do not have one */
422 record.ExceptionCode = STATUS_UNWIND;
423 record.ExceptionFlags = 0;
424 record.ExceptionRecord = NULL;
425 record.ExceptionAddress = GET_IP(context);
426 record.NumberParameters = 0;
430 pRecord->ExceptionFlags |= EH_UNWINDING | (pEndFrame ? 0 : EH_EXIT_UNWIND);
432 TRACE( "code=%x flags=%x\n", pRecord->ExceptionCode, pRecord->ExceptionFlags );
434 /* get chain of exception frames */
435 frame = NtCurrentTeb()->Tib.ExceptionList;
436 while ((frame != (EXCEPTION_REGISTRATION_RECORD*)~0UL) && (frame != pEndFrame))
438 /* Check frame address */
439 if (pEndFrame && (frame > pEndFrame))
441 newrec.ExceptionCode = STATUS_INVALID_UNWIND_TARGET;
442 newrec.ExceptionFlags = EH_NONCONTINUABLE;
443 newrec.ExceptionRecord = pRecord;
444 newrec.NumberParameters = 0;
445 RtlRaiseException( &newrec ); /* never returns */
447 if (((void*)frame < NtCurrentTeb()->Tib.StackLimit) ||
448 ((void*)(frame+1) > NtCurrentTeb()->Tib.StackBase) ||
451 newrec.ExceptionCode = STATUS_BAD_STACK;
452 newrec.ExceptionFlags = EH_NONCONTINUABLE;
453 newrec.ExceptionRecord = pRecord;
454 newrec.NumberParameters = 0;
455 RtlRaiseException( &newrec ); /* never returns */
459 TRACE( "calling handler at %p code=%x flags=%x\n",
460 frame->Handler, pRecord->ExceptionCode, pRecord->ExceptionFlags );
461 res = EXC_CallHandler( pRecord, frame, context, &dispatch, frame->Handler, EXC_UnwindHandler );
462 TRACE( "handler at %p returned %x\n", frame->Handler, res );
466 case ExceptionContinueSearch:
468 case ExceptionCollidedUnwind:
472 newrec.ExceptionCode = STATUS_INVALID_DISPOSITION;
473 newrec.ExceptionFlags = EH_NONCONTINUABLE;
474 newrec.ExceptionRecord = pRecord;
475 newrec.NumberParameters = 0;
476 RtlRaiseException( &newrec ); /* never returns */
479 frame = __wine_pop_frame( frame );
483 /**********************************************************************/
485 #ifdef DEFINE_REGS_ENTRYPOINT
486 DEFINE_REGS_ENTRYPOINT( RtlUnwind, 16, 16 );
488 void WINAPI RtlUnwind( PVOID pEndFrame, PVOID unusedEip,
489 PEXCEPTION_RECORD pRecord, PVOID returnEax )
492 memset( &context, 0, sizeof(context) );
493 __regs_RtlUnwind( pEndFrame, unusedEip, pRecord, returnEax, &context );
498 /***********************************************************************
499 * RtlRaiseStatus (NTDLL.@)
501 * Raise an exception with ExceptionCode = status
503 void WINAPI RtlRaiseStatus( NTSTATUS status )
505 EXCEPTION_RECORD ExceptionRec;
507 ExceptionRec.ExceptionCode = status;
508 ExceptionRec.ExceptionFlags = EH_NONCONTINUABLE;
509 ExceptionRec.ExceptionRecord = NULL;
510 ExceptionRec.NumberParameters = 0;
511 RtlRaiseException( &ExceptionRec );
515 /*******************************************************************
516 * RtlAddVectoredExceptionHandler (NTDLL.@)
518 PVOID WINAPI RtlAddVectoredExceptionHandler( ULONG first, PVECTORED_EXCEPTION_HANDLER func )
520 VECTORED_HANDLER *handler = RtlAllocateHeap( GetProcessHeap(), 0, sizeof(*handler) );
523 handler->func = func;
524 RtlEnterCriticalSection( &vectored_handlers_section );
525 if (first) list_add_head( &vectored_handlers, &handler->entry );
526 else list_add_tail( &vectored_handlers, &handler->entry );
527 RtlLeaveCriticalSection( &vectored_handlers_section );
533 /*******************************************************************
534 * RtlRemoveVectoredExceptionHandler (NTDLL.@)
536 ULONG WINAPI RtlRemoveVectoredExceptionHandler( PVOID handler )
541 RtlEnterCriticalSection( &vectored_handlers_section );
542 LIST_FOR_EACH( ptr, &vectored_handlers )
544 VECTORED_HANDLER *curr_handler = LIST_ENTRY( ptr, VECTORED_HANDLER, entry );
545 if (curr_handler == handler)
552 RtlLeaveCriticalSection( &vectored_handlers_section );
553 if (ret) RtlFreeHeap( GetProcessHeap(), 0, handler );
558 /*************************************************************
559 * __wine_exception_handler (NTDLL.@)
561 * Exception handler for exception blocks declared in Wine code.
563 DWORD __wine_exception_handler( EXCEPTION_RECORD *record, EXCEPTION_REGISTRATION_RECORD *frame,
564 CONTEXT *context, EXCEPTION_REGISTRATION_RECORD **pdispatcher )
566 __WINE_FRAME *wine_frame = (__WINE_FRAME *)frame;
568 if (record->ExceptionFlags & (EH_UNWINDING | EH_EXIT_UNWIND | EH_NESTED_CALL))
569 return ExceptionContinueSearch;
571 if (wine_frame->u.filter == (void *)1) /* special hack for page faults */
573 if (record->ExceptionCode != STATUS_ACCESS_VIOLATION)
574 return ExceptionContinueSearch;
576 else if (wine_frame->u.filter)
578 EXCEPTION_POINTERS ptrs;
579 ptrs.ExceptionRecord = record;
580 ptrs.ContextRecord = context;
581 switch(wine_frame->u.filter( &ptrs ))
583 case EXCEPTION_CONTINUE_SEARCH:
584 return ExceptionContinueSearch;
585 case EXCEPTION_CONTINUE_EXECUTION:
586 return ExceptionContinueExecution;
587 case EXCEPTION_EXECUTE_HANDLER:
590 MESSAGE( "Invalid return value from exception filter\n" );
594 /* hack to make GetExceptionCode() work in handler */
595 wine_frame->ExceptionCode = record->ExceptionCode;
596 wine_frame->ExceptionRecord = wine_frame;
598 RtlUnwind( frame, 0, record, 0 );
599 __wine_pop_frame( frame );
600 siglongjmp( wine_frame->jmp, 1 );
604 /*************************************************************
605 * __wine_finally_handler (NTDLL.@)
607 * Exception handler for try/finally blocks declared in Wine code.
609 DWORD __wine_finally_handler( EXCEPTION_RECORD *record, EXCEPTION_REGISTRATION_RECORD *frame,
610 CONTEXT *context, EXCEPTION_REGISTRATION_RECORD **pdispatcher )
612 if (record->ExceptionFlags & (EH_UNWINDING | EH_EXIT_UNWIND))
614 __WINE_FRAME *wine_frame = (__WINE_FRAME *)frame;
615 wine_frame->u.finally_func( FALSE );
617 return ExceptionContinueSearch;
621 /*************************************************************
622 * __wine_spec_unimplemented_stub
624 * ntdll-specific implementation to avoid depending on kernel functions.
625 * Can be removed once ntdll.spec no longer contains stubs.
627 void __wine_spec_unimplemented_stub( const char *module, const char *function )
629 EXCEPTION_RECORD record;
631 record.ExceptionCode = EXCEPTION_WINE_STUB;
632 record.ExceptionFlags = EH_NONCONTINUABLE;
633 record.ExceptionRecord = NULL;
634 record.ExceptionAddress = __wine_spec_unimplemented_stub;
635 record.NumberParameters = 2;
636 record.ExceptionInformation[0] = (ULONG_PTR)module;
637 record.ExceptionInformation[1] = (ULONG_PTR)function;
638 RtlRaiseException( &record );