dlls/ntdll/exception.c

   1 /*
   2  * NT exception handling routines
   3  *
   4  * Copyright 1999 Turchanov Sergey
   5  * Copyright 1999 Alexandre Julliard
   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
  22 #include "config.h"
  23 #include "wine/port.h"
  24
  25 #include <assert.h>
  26 #include <signal.h>
  27 #include <stdarg.h>
  28
  29 #include "ntstatus.h"
  30 #define WIN32_NO_STATUS
  31 #include "windef.h"
  32 #include "winternl.h"
  33 #include "wine/exception.h"
  34 #include "wine/server.h"
  35 #include "wine/list.h"
  36 #include "wine/debug.h"
  37 #include "excpt.h"
  38 #include "ntdll_misc.h"
  39
  40 WINE_DEFAULT_DEBUG_CHANNEL(seh);
  41
  42 /* Exception record for handling exceptions happening inside exception handlers */
  43 typedef struct
  44 {
  45     EXCEPTION_REGISTRATION_RECORD frame;
  46     EXCEPTION_REGISTRATION_RECORD *prevFrame;
  47 } EXC_NESTED_FRAME;
  48
  49 typedef struct
  50 {
  51     struct list                 entry;
  52     PVECTORED_EXCEPTION_HANDLER func;
  53 } VECTORED_HANDLER;
  54
  55 static struct list vectored_handlers = LIST_INIT(vectored_handlers);
  56
  57 static RTL_CRITICAL_SECTION vectored_handlers_section;
  58 static RTL_CRITICAL_SECTION_DEBUG critsect_debug =
  59 {
  60     0, 0, &vectored_handlers_section,
  61     { &critsect_debug.ProcessLocksList, &critsect_debug.ProcessLocksList },
  62       0, 0, { (DWORD_PTR)(__FILE__ ": vectored_handlers_section") }
  63 };
  64 static RTL_CRITICAL_SECTION vectored_handlers_section = { &critsect_debug, -1, 0, 0, 0, 0 };
  65
  66 #ifdef __i386__
  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)
  76 #else
  77 # error You must define GET_IP for this CPU
  78 #endif
  79
  80 /*******************************************************************
  81  *         EXC_RaiseHandler
  82  *
  83  * Handler for exceptions happening inside a handler.
  84  */
  85 static DWORD EXC_RaiseHandler( EXCEPTION_RECORD *rec, EXCEPTION_REGISTRATION_RECORD *frame,
  86                                CONTEXT *context, EXCEPTION_REGISTRATION_RECORD **dispatcher )
  87 {
  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;
  93 }
  94
  95
  96 /*******************************************************************
  97  *         EXC_UnwindHandler
  98  *
  99  * Handler for exceptions happening inside an unwind handler.
 100  */
 101 static DWORD EXC_UnwindHandler( EXCEPTION_RECORD *rec, EXCEPTION_REGISTRATION_RECORD *frame,
 102                                 CONTEXT *context, EXCEPTION_REGISTRATION_RECORD **dispatcher )
 103 {
 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;
 109 }
 110
 111
 112 /*******************************************************************
 113  *         EXC_CallHandler
 114  *
 115  * Call an exception handler, setting up an exception frame to catch exceptions
 116  * happening during the handler execution.
 117  *
 118  * For i386 this function is implemented in assembler in signal_i386.c.
 119  */
 120 #ifndef __i386__
 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)
 124 {
 125     EXC_NESTED_FRAME newframe;
 126     DWORD ret;
 127
 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 );
 133     return ret;
 134 }
 135 #else
 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);
 140 #endif
 141
 142 /**********************************************************************
 143  *           wait_suspend
 144  *
 145  * Wait until the thread is no longer suspended.
 146  */
 147 void wait_suspend( CONTEXT *context )
 148 {
 149     LARGE_INTEGER timeout;
 150
 151     /* store the context we got at suspend time */
 152     SERVER_START_REQ( set_thread_context )
 153     {
 154         req->handle  = GetCurrentThread();
 155         req->flags   = CONTEXT_FULL;
 156         req->suspend = 1;
 157         wine_server_add_data( req, context, sizeof(*context) );
 158         wine_server_call( req );
 159     }
 160     SERVER_END_REQ;
 161
 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, SELECT_INTERRUPTIBLE, &timeout, 0 );
 165
 166     /* retrieve the new context */
 167     SERVER_START_REQ( get_thread_context )
 168     {
 169         req->handle  = GetCurrentThread();
 170         req->flags   = CONTEXT_FULL;
 171         req->suspend = 1;
 172         wine_server_set_reply( req, context, sizeof(*context) );
 173         wine_server_call( req );
 174     }
 175     SERVER_END_REQ;
 176 }
 177
 178
 179 /**********************************************************************
 180  *           send_debug_event
 181  *
 182  * Send an EXCEPTION_DEBUG_EVENT event to the debugger.
 183  */
 184 static NTSTATUS send_debug_event( EXCEPTION_RECORD *rec, int first_chance, CONTEXT *context )
 185 {
 186     int ret;
 187     HANDLE handle = 0;
 188
 189     if (!NtCurrentTeb()->Peb->BeingDebugged) return 0;  /* no debugger present */
 190
 191     SERVER_START_REQ( queue_exception_event )
 192     {
 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;
 197     }
 198     SERVER_END_REQ;
 199     if (!handle) return 0;
 200
 201     NTDLL_wait_for_multiple_objects( 1, &handle, SELECT_INTERRUPTIBLE, NULL, 0 );
 202
 203     SERVER_START_REQ( get_exception_status )
 204     {
 205         req->handle = handle;
 206         wine_server_set_reply( req, context, sizeof(*context) );
 207         ret = wine_server_call( req );
 208     }
 209     SERVER_END_REQ;
 210     return ret;
 211 }
 212
 213
 214 /**********************************************************************
 215  *           call_vectored_handlers
 216  *
 217  * Call the vectored handlers chain.
 218  */
 219 static LONG call_vectored_handlers( EXCEPTION_RECORD *rec, CONTEXT *context )
 220 {
 221     struct list *ptr;
 222     LONG ret = EXCEPTION_CONTINUE_SEARCH;
 223     EXCEPTION_POINTERS except_ptrs;
 224
 225     except_ptrs.ExceptionRecord = rec;
 226     except_ptrs.ContextRecord = context;
 227
 228     RtlEnterCriticalSection( &vectored_handlers_section );
 229     LIST_FOR_EACH( ptr, &vectored_handlers )
 230     {
 231         VECTORED_HANDLER *handler = LIST_ENTRY( ptr, VECTORED_HANDLER, entry );
 232         ret = handler->func( &except_ptrs );
 233         if (ret == EXCEPTION_CONTINUE_EXECUTION) break;
 234     }
 235     RtlLeaveCriticalSection( &vectored_handlers_section );
 236     return ret;
 237 }
 238
 239
 240 /**********************************************************************
 241  *           call_stack_handlers
 242  *
 243  * Call the stack handlers chain.
 244  */
 245 static NTSTATUS call_stack_handlers( EXCEPTION_RECORD *rec, CONTEXT *context )
 246 {
 247     EXCEPTION_REGISTRATION_RECORD *frame, *dispatch, *nested_frame;
 248     DWORD res;
 249
 250     frame = NtCurrentTeb()->Tib.ExceptionList;
 251     nested_frame = NULL;
 252     while (frame != (EXCEPTION_REGISTRATION_RECORD*)~0UL)
 253     {
 254         /* Check frame address */
 255         if (((void*)frame < NtCurrentTeb()->Tib.StackLimit) ||
 256             ((void*)(frame+1) > NtCurrentTeb()->Tib.StackBase) ||
 257             (ULONG_PTR)frame & 3)
 258         {
 259             rec->ExceptionFlags |= EH_STACK_INVALID;
 260             break;
 261         }
 262
 263         /* Call handler */
 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 );
 268
 269         if (frame == nested_frame)
 270         {
 271             /* no longer nested */
 272             nested_frame = NULL;
 273             rec->ExceptionFlags &= ~EH_NESTED_CALL;
 274         }
 275
 276         switch(res)
 277         {
 278         case ExceptionContinueExecution:
 279             if (!(rec->ExceptionFlags & EH_NONCONTINUABLE)) return STATUS_SUCCESS;
 280             return STATUS_NONCONTINUABLE_EXCEPTION;
 281         case ExceptionContinueSearch:
 282             break;
 283         case ExceptionNestedException:
 284             if (nested_frame < dispatch) nested_frame = dispatch;
 285             rec->ExceptionFlags |= EH_NESTED_CALL;
 286             break;
 287         default:
 288             return STATUS_INVALID_DISPOSITION;
 289         }
 290         frame = frame->Prev;
 291     }
 292     return STATUS_UNHANDLED_EXCEPTION;
 293 }
 294
 295
 296 /*******************************************************************
 297  *              raise_exception
 298  *
 299  * Implementation of NtRaiseException.
 300  */
 301 static NTSTATUS raise_exception( EXCEPTION_RECORD *rec, CONTEXT *context, BOOL first_chance )
 302 {
 303     NTSTATUS status;
 304
 305     if (first_chance)
 306     {
 307         DWORD c;
 308
 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)
 314         {
 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] );
 319             else
 320                 MESSAGE( "wine: Call from %p to unimplemented function %s.%ld, aborting\n",
 321                          rec->ExceptionAddress,
 322                          (char*)rec->ExceptionInformation[0], rec->ExceptionInformation[1] );
 323         }
 324 #ifdef __i386__
 325         else
 326         {
 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 );
 333         }
 334 #endif
 335         status = send_debug_event( rec, TRUE, context );
 336         if (status == DBG_CONTINUE || status == DBG_EXCEPTION_HANDLED)
 337             return STATUS_SUCCESS;
 338
 339 #ifdef __i386__
 340         /* fix up instruction pointer in context for EXCEPTION_BREAKPOINT */
 341         if (rec->ExceptionCode == EXCEPTION_BREAKPOINT) context->Eip--;
 342 #endif
 343
 344         if (call_vectored_handlers( rec, context ) == EXCEPTION_CONTINUE_EXECUTION)
 345             return STATUS_SUCCESS;
 346
 347         if ((status = call_stack_handlers( rec, context )) != STATUS_UNHANDLED_EXCEPTION)
 348             return status;
 349     }
 350
 351     /* last chance exception */
 352
 353     status = send_debug_event( rec, FALSE, context );
 354     if (status != DBG_CONTINUE)
 355     {
 356         if (rec->ExceptionFlags & EH_STACK_INVALID)
 357             ERR("Exception frame is not in stack limits => unable to dispatch exception.\n");
 358         else if (rec->ExceptionCode == STATUS_NONCONTINUABLE_EXCEPTION)
 359             ERR("Process attempted to continue execution after noncontinuable exception.\n");
 360         else
 361             ERR("Unhandled exception code %x flags %x addr %p\n",
 362                 rec->ExceptionCode, rec->ExceptionFlags, rec->ExceptionAddress );
 363         NtTerminateProcess( NtCurrentProcess(), 1 );
 364     }
 365     return STATUS_SUCCESS;
 366 }
 367
 368
 369 /*******************************************************************
 370  *              NtRaiseException (NTDLL.@)
 371  */
 372 NTSTATUS WINAPI NtRaiseException( EXCEPTION_RECORD *rec, CONTEXT *context, BOOL first_chance )
 373 {
 374     NTSTATUS status = raise_exception( rec, context, first_chance );
 375     if (status == STATUS_SUCCESS) NtSetContextThread( GetCurrentThread(), context );
 376     return status;
 377 }
 378
 379 /***********************************************************************
 380  *              RtlRaiseException (NTDLL.@)
 381  */
 382 void WINAPI __regs_RtlRaiseException( EXCEPTION_RECORD *rec, CONTEXT *context )
 383 {
 384     NTSTATUS status = raise_exception( rec, context, TRUE );
 385     if (status != STATUS_SUCCESS)
 386     {
 387         EXCEPTION_RECORD newrec;
 388         newrec.ExceptionCode    = status;
 389         newrec.ExceptionFlags   = EH_NONCONTINUABLE;
 390         newrec.ExceptionRecord  = rec;
 391         newrec.NumberParameters = 0;
 392         RtlRaiseException( &newrec );  /* never returns */
 393     }
 394 }
 395
 396 /**********************************************************************/
 397
 398 #ifdef DEFINE_REGS_ENTRYPOINT
 399 DEFINE_REGS_ENTRYPOINT( RtlRaiseException, 4, 4 )
 400 #else
 401 void WINAPI RtlRaiseException( EXCEPTION_RECORD *rec )
 402 {
 403     CONTEXT context;
 404     memset( &context, 0, sizeof(context) );
 405     __regs_RtlRaiseException( rec, &context );
 406 }
 407 #endif
 408
 409
 410 /*******************************************************************
 411  *              RtlUnwind (NTDLL.@)
 412  */
 413 void WINAPI __regs_RtlUnwind( EXCEPTION_REGISTRATION_RECORD* pEndFrame, PVOID unusedEip,
 414                               PEXCEPTION_RECORD pRecord, PVOID returnEax, CONTEXT *context )
 415 {
 416     EXCEPTION_RECORD record, newrec;
 417     EXCEPTION_REGISTRATION_RECORD *frame, *dispatch;
 418     DWORD res;
 419
 420 #ifdef __i386__
 421     context->Eax = (DWORD)returnEax;
 422 #endif
 423
 424     /* build an exception record, if we do not have one */
 425     if (!pRecord)
 426     {
 427         record.ExceptionCode    = STATUS_UNWIND;
 428         record.ExceptionFlags   = 0;
 429         record.ExceptionRecord  = NULL;
 430         record.ExceptionAddress = GET_IP(context);
 431         record.NumberParameters = 0;
 432         pRecord = &record;
 433     }
 434
 435     pRecord->ExceptionFlags |= EH_UNWINDING | (pEndFrame ? 0 : EH_EXIT_UNWIND);
 436
 437     TRACE( "code=%x flags=%x\n", pRecord->ExceptionCode, pRecord->ExceptionFlags );
 438
 439     /* get chain of exception frames */
 440     frame = NtCurrentTeb()->Tib.ExceptionList;
 441     while ((frame != (EXCEPTION_REGISTRATION_RECORD*)~0UL) && (frame != pEndFrame))
 442     {
 443         /* Check frame address */
 444         if (pEndFrame && (frame > pEndFrame))
 445         {
 446             newrec.ExceptionCode    = STATUS_INVALID_UNWIND_TARGET;
 447             newrec.ExceptionFlags   = EH_NONCONTINUABLE;
 448             newrec.ExceptionRecord  = pRecord;
 449             newrec.NumberParameters = 0;
 450             RtlRaiseException( &newrec );  /* never returns */
 451         }
 452         if (((void*)frame < NtCurrentTeb()->Tib.StackLimit) ||
 453             ((void*)(frame+1) > NtCurrentTeb()->Tib.StackBase) ||
 454             (UINT_PTR)frame & 3)
 455         {
 456             newrec.ExceptionCode    = STATUS_BAD_STACK;
 457             newrec.ExceptionFlags   = EH_NONCONTINUABLE;
 458             newrec.ExceptionRecord  = pRecord;
 459             newrec.NumberParameters = 0;
 460             RtlRaiseException( &newrec );  /* never returns */
 461         }
 462
 463         /* Call handler */
 464         TRACE( "calling handler at %p code=%x flags=%x\n",
 465                frame->Handler, pRecord->ExceptionCode, pRecord->ExceptionFlags );
 466         res = EXC_CallHandler( pRecord, frame, context, &dispatch, frame->Handler, EXC_UnwindHandler );
 467         TRACE( "handler at %p returned %x\n", frame->Handler, res );
 468
 469         switch(res)
 470         {
 471         case ExceptionContinueSearch:
 472             break;
 473         case ExceptionCollidedUnwind:
 474             frame = dispatch;
 475             break;
 476         default:
 477             newrec.ExceptionCode    = STATUS_INVALID_DISPOSITION;
 478             newrec.ExceptionFlags   = EH_NONCONTINUABLE;
 479             newrec.ExceptionRecord  = pRecord;
 480             newrec.NumberParameters = 0;
 481             RtlRaiseException( &newrec );  /* never returns */
 482             break;
 483         }
 484         frame = __wine_pop_frame( frame );
 485     }
 486 }
 487
 488 /**********************************************************************/
 489
 490 #ifdef DEFINE_REGS_ENTRYPOINT
 491 DEFINE_REGS_ENTRYPOINT( RtlUnwind, 16, 16 )
 492 #else
 493 void WINAPI RtlUnwind( PVOID pEndFrame, PVOID unusedEip,
 494                        PEXCEPTION_RECORD pRecord, PVOID returnEax )
 495 {
 496     CONTEXT context;
 497     memset( &context, 0, sizeof(context) );
 498     __regs_RtlUnwind( pEndFrame, unusedEip, pRecord, returnEax, &context );
 499 }
 500 #endif
 501
 502
 503 /***********************************************************************
 504  *            RtlRaiseStatus  (NTDLL.@)
 505  *
 506  * Raise an exception with ExceptionCode = status
 507  */
 508 void WINAPI RtlRaiseStatus( NTSTATUS status )
 509 {
 510     EXCEPTION_RECORD ExceptionRec;
 511
 512     ExceptionRec.ExceptionCode    = status;
 513     ExceptionRec.ExceptionFlags   = EH_NONCONTINUABLE;
 514     ExceptionRec.ExceptionRecord  = NULL;
 515     ExceptionRec.NumberParameters = 0;
 516     RtlRaiseException( &ExceptionRec );
 517 }
 518
 519
 520 /*******************************************************************
 521  *         RtlAddVectoredExceptionHandler   (NTDLL.@)
 522  */
 523 PVOID WINAPI RtlAddVectoredExceptionHandler( ULONG first, PVECTORED_EXCEPTION_HANDLER func )
 524 {
 525     VECTORED_HANDLER *handler = RtlAllocateHeap( GetProcessHeap(), 0, sizeof(*handler) );
 526     if (handler)
 527     {
 528         handler->func = func;
 529         RtlEnterCriticalSection( &vectored_handlers_section );
 530         if (first) list_add_head( &vectored_handlers, &handler->entry );
 531         else list_add_tail( &vectored_handlers, &handler->entry );
 532         RtlLeaveCriticalSection( &vectored_handlers_section );
 533     }
 534     return handler;
 535 }
 536
 537
 538 /*******************************************************************
 539  *         RtlRemoveVectoredExceptionHandler   (NTDLL.@)
 540  */
 541 ULONG WINAPI RtlRemoveVectoredExceptionHandler( PVOID handler )
 542 {
 543     struct list *ptr;
 544     ULONG ret = FALSE;
 545
 546     RtlEnterCriticalSection( &vectored_handlers_section );
 547     LIST_FOR_EACH( ptr, &vectored_handlers )
 548     {
 549         VECTORED_HANDLER *curr_handler = LIST_ENTRY( ptr, VECTORED_HANDLER, entry );
 550         if (curr_handler == handler)
 551         {
 552             list_remove( ptr );
 553             ret = TRUE;
 554             break;
 555         }
 556     }
 557     RtlLeaveCriticalSection( &vectored_handlers_section );
 558     if (ret) RtlFreeHeap( GetProcessHeap(), 0, handler );
 559     return ret;
 560 }
 561
 562
 563 /*************************************************************
 564  *            __wine_exception_handler (NTDLL.@)
 565  *
 566  * Exception handler for exception blocks declared in Wine code.
 567  */
 568 DWORD __wine_exception_handler( EXCEPTION_RECORD *record, EXCEPTION_REGISTRATION_RECORD *frame,
 569                                 CONTEXT *context, EXCEPTION_REGISTRATION_RECORD **pdispatcher )
 570 {
 571     __WINE_FRAME *wine_frame = (__WINE_FRAME *)frame;
 572
 573     if (record->ExceptionFlags & (EH_UNWINDING | EH_EXIT_UNWIND | EH_NESTED_CALL))
 574         return ExceptionContinueSearch;
 575
 576     if (wine_frame->u.filter == (void *)1)  /* special hack for page faults */
 577     {
 578         if (record->ExceptionCode != STATUS_ACCESS_VIOLATION)
 579             return ExceptionContinueSearch;
 580     }
 581     else if (wine_frame->u.filter)
 582     {
 583         EXCEPTION_POINTERS ptrs;
 584         ptrs.ExceptionRecord = record;
 585         ptrs.ContextRecord = context;
 586         switch(wine_frame->u.filter( &ptrs ))
 587         {
 588         case EXCEPTION_CONTINUE_SEARCH:
 589             return ExceptionContinueSearch;
 590         case EXCEPTION_CONTINUE_EXECUTION:
 591             return ExceptionContinueExecution;
 592         case EXCEPTION_EXECUTE_HANDLER:
 593             break;
 594         default:
 595             MESSAGE( "Invalid return value from exception filter\n" );
 596             assert( FALSE );
 597         }
 598     }
 599     /* hack to make GetExceptionCode() work in handler */
 600     wine_frame->ExceptionCode   = record->ExceptionCode;
 601     wine_frame->ExceptionRecord = wine_frame;
 602
 603     RtlUnwind( frame, 0, record, 0 );
 604     __wine_pop_frame( frame );
 605     siglongjmp( wine_frame->jmp, 1 );
 606 }
 607
 608
 609 /*************************************************************
 610  *            __wine_finally_handler (NTDLL.@)
 611  *
 612  * Exception handler for try/finally blocks declared in Wine code.
 613  */
 614 DWORD __wine_finally_handler( EXCEPTION_RECORD *record, EXCEPTION_REGISTRATION_RECORD *frame,
 615                               CONTEXT *context, EXCEPTION_REGISTRATION_RECORD **pdispatcher )
 616 {
 617     if (record->ExceptionFlags & (EH_UNWINDING | EH_EXIT_UNWIND))
 618     {
 619         __WINE_FRAME *wine_frame = (__WINE_FRAME *)frame;
 620         wine_frame->u.finally_func( FALSE );
 621     }
 622     return ExceptionContinueSearch;
 623 }
 624
 625
 626 /*************************************************************
 627  *            __wine_spec_unimplemented_stub
 628  *
 629  * ntdll-specific implementation to avoid depending on kernel functions.
 630  * Can be removed once ntdll.spec no longer contains stubs.
 631  */
 632 void __wine_spec_unimplemented_stub( const char *module, const char *function )
 633 {
 634     EXCEPTION_RECORD record;
 635
 636     record.ExceptionCode    = EXCEPTION_WINE_STUB;
 637     record.ExceptionFlags   = EH_NONCONTINUABLE;
 638     record.ExceptionRecord  = NULL;
 639     record.ExceptionAddress = __wine_spec_unimplemented_stub;
 640     record.NumberParameters = 2;
 641     record.ExceptionInformation[0] = (ULONG_PTR)module;
 642     record.ExceptionInformation[1] = (ULONG_PTR)function;
 643     RtlRaiseException( &record );
 644 }