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, 0, &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, 0, 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=%lx flags=%lx\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 %lx\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=%lx flags=%lx addr=%p\n",
 310                rec->ExceptionCode, rec->ExceptionFlags, rec->ExceptionAddress );
 311         for (c = 0; c < rec->NumberParameters; c++)
 312             TRACE( " info[%ld]=%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=%08lx ebx=%08lx ecx=%08lx edx=%08lx esi=%08lx edi=%08lx\n",
 328                   context->Eax, context->Ebx, context->Ecx,
 329                   context->Edx, context->Esi, context->Edi );
 330             TRACE(" ebp=%08lx esp=%08lx cs=%04lx ds=%04lx es=%04lx fs=%04lx gs=%04lx flags=%08lx\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         if (call_vectored_handlers( rec, context ) == EXCEPTION_CONTINUE_EXECUTION)
 340             return STATUS_SUCCESS;
 341
 342         if ((status = call_stack_handlers( rec, context )) != STATUS_UNHANDLED_EXCEPTION)
 343             return status;
 344     }
 345
 346     /* last chance exception */
 347
 348     status = send_debug_event( rec, FALSE, context );
 349     if (status != DBG_CONTINUE)
 350     {
 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");
 355         else
 356             ERR("Unhandled exception code %lx flags %lx addr %p\n",
 357                 rec->ExceptionCode, rec->ExceptionFlags, rec->ExceptionAddress );
 358         NtTerminateProcess( NtCurrentProcess(), 1 );
 359     }
 360     return STATUS_SUCCESS;
 361 }
 362
 363
 364 /*******************************************************************
 365  *              NtRaiseException (NTDLL.@)
 366  */
 367 NTSTATUS WINAPI NtRaiseException( EXCEPTION_RECORD *rec, CONTEXT *context, BOOL first_chance )
 368 {
 369     NTSTATUS status = raise_exception( rec, context, first_chance );
 370     if (status == STATUS_SUCCESS) NtSetContextThread( GetCurrentThread(), context );
 371     return status;
 372 }
 373
 374 /***********************************************************************
 375  *              RtlRaiseException (NTDLL.@)
 376  */
 377 void WINAPI __regs_RtlRaiseException( EXCEPTION_RECORD *rec, CONTEXT *context )
 378 {
 379     NTSTATUS status = raise_exception( rec, context, TRUE );
 380     if (status != STATUS_SUCCESS)
 381     {
 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 */
 388     }
 389 }
 390
 391 /**********************************************************************/
 392
 393 #ifdef DEFINE_REGS_ENTRYPOINT
 394 DEFINE_REGS_ENTRYPOINT( RtlRaiseException, 4, 4 );
 395 #else
 396 void WINAPI RtlRaiseException( EXCEPTION_RECORD *rec )
 397 {
 398     CONTEXT context;
 399     memset( &context, 0, sizeof(context) );
 400     __regs_RtlRaiseException( rec, &context );
 401 }
 402 #endif
 403
 404
 405 /*******************************************************************
 406  *              RtlUnwind (NTDLL.@)
 407  */
 408 void WINAPI __regs_RtlUnwind( EXCEPTION_REGISTRATION_RECORD* pEndFrame, PVOID unusedEip,
 409                               PEXCEPTION_RECORD pRecord, PVOID returnEax, CONTEXT *context )
 410 {
 411     EXCEPTION_RECORD record, newrec;
 412     EXCEPTION_REGISTRATION_RECORD *frame, *dispatch;
 413     DWORD res;
 414
 415 #ifdef __i386__
 416     context->Eax = (DWORD)returnEax;
 417 #endif
 418
 419     /* build an exception record, if we do not have one */
 420     if (!pRecord)
 421     {
 422         record.ExceptionCode    = STATUS_UNWIND;
 423         record.ExceptionFlags   = 0;
 424         record.ExceptionRecord  = NULL;
 425         record.ExceptionAddress = GET_IP(context);
 426         record.NumberParameters = 0;
 427         pRecord = &record;
 428     }
 429
 430     pRecord->ExceptionFlags |= EH_UNWINDING | (pEndFrame ? 0 : EH_EXIT_UNWIND);
 431
 432     TRACE( "code=%lx flags=%lx\n", pRecord->ExceptionCode, pRecord->ExceptionFlags );
 433
 434     /* get chain of exception frames */
 435     frame = NtCurrentTeb()->Tib.ExceptionList;
 436     while ((frame != (EXCEPTION_REGISTRATION_RECORD*)~0UL) && (frame != pEndFrame))
 437     {
 438         /* Check frame address */
 439         if (pEndFrame && (frame > pEndFrame))
 440         {
 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 */
 446         }
 447         if (((void*)frame < NtCurrentTeb()->Tib.StackLimit) ||
 448             ((void*)(frame+1) > NtCurrentTeb()->Tib.StackBase) ||
 449             (UINT_PTR)frame & 3)
 450         {
 451             newrec.ExceptionCode    = STATUS_BAD_STACK;
 452             newrec.ExceptionFlags   = EH_NONCONTINUABLE;
 453             newrec.ExceptionRecord  = pRecord;
 454             newrec.NumberParameters = 0;
 455             RtlRaiseException( &newrec );  /* never returns */
 456         }
 457
 458         /* Call handler */
 459         TRACE( "calling handler at %p code=%lx flags=%lx\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 %lx\n", frame->Handler, res );
 463
 464         switch(res)
 465         {
 466         case ExceptionContinueSearch:
 467             break;
 468         case ExceptionCollidedUnwind:
 469             frame = dispatch;
 470             break;
 471         default:
 472             newrec.ExceptionCode    = STATUS_INVALID_DISPOSITION;
 473             newrec.ExceptionFlags   = EH_NONCONTINUABLE;
 474             newrec.ExceptionRecord  = pRecord;
 475             newrec.NumberParameters = 0;
 476             RtlRaiseException( &newrec );  /* never returns */
 477             break;
 478         }
 479         frame = __wine_pop_frame( frame );
 480     }
 481 }
 482
 483 /**********************************************************************/
 484
 485 #ifdef DEFINE_REGS_ENTRYPOINT
 486 DEFINE_REGS_ENTRYPOINT( RtlUnwind, 16, 16 );
 487 #else
 488 void WINAPI RtlUnwind( PVOID pEndFrame, PVOID unusedEip,
 489                        PEXCEPTION_RECORD pRecord, PVOID returnEax )
 490 {
 491     CONTEXT context;
 492     memset( &context, 0, sizeof(context) );
 493     __regs_RtlUnwind( pEndFrame, unusedEip, pRecord, returnEax, &context );
 494 }
 495 #endif
 496
 497
 498 /***********************************************************************
 499  *            RtlRaiseStatus  (NTDLL.@)
 500  *
 501  * Raise an exception with ExceptionCode = status
 502  */
 503 void WINAPI RtlRaiseStatus( NTSTATUS status )
 504 {
 505     EXCEPTION_RECORD ExceptionRec;
 506
 507     ExceptionRec.ExceptionCode    = status;
 508     ExceptionRec.ExceptionFlags   = EH_NONCONTINUABLE;
 509     ExceptionRec.ExceptionRecord  = NULL;
 510     ExceptionRec.NumberParameters = 0;
 511     RtlRaiseException( &ExceptionRec );
 512 }
 513
 514
 515 /*******************************************************************
 516  *         RtlAddVectoredExceptionHandler   (NTDLL.@)
 517  */
 518 PVOID WINAPI RtlAddVectoredExceptionHandler( ULONG first, PVECTORED_EXCEPTION_HANDLER func )
 519 {
 520     VECTORED_HANDLER *handler = RtlAllocateHeap( GetProcessHeap(), 0, sizeof(*handler) );
 521     if (handler)
 522     {
 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 );
 528     }
 529     return handler;
 530 }
 531
 532
 533 /*******************************************************************
 534  *         RtlRemoveVectoredExceptionHandler   (NTDLL.@)
 535  */
 536 ULONG WINAPI RtlRemoveVectoredExceptionHandler( PVOID handler )
 537 {
 538     struct list *ptr;
 539     ULONG ret = FALSE;
 540
 541     RtlEnterCriticalSection( &vectored_handlers_section );
 542     LIST_FOR_EACH( ptr, &vectored_handlers )
 543     {
 544         VECTORED_HANDLER *curr_handler = LIST_ENTRY( ptr, VECTORED_HANDLER, entry );
 545         if (curr_handler == handler)
 546         {
 547             list_remove( ptr );
 548             ret = TRUE;
 549             break;
 550         }
 551     }
 552     RtlLeaveCriticalSection( &vectored_handlers_section );
 553     if (ret) RtlFreeHeap( GetProcessHeap(), 0, handler );
 554     return ret;
 555 }
 556
 557
 558 /*************************************************************
 559  *            __wine_exception_handler (NTDLL.@)
 560  *
 561  * Exception handler for exception blocks declared in Wine code.
 562  */
 563 DWORD __wine_exception_handler( EXCEPTION_RECORD *record, EXCEPTION_REGISTRATION_RECORD *frame,
 564                                 CONTEXT *context, EXCEPTION_REGISTRATION_RECORD **pdispatcher )
 565 {
 566     __WINE_FRAME *wine_frame = (__WINE_FRAME *)frame;
 567
 568     if (record->ExceptionFlags & (EH_UNWINDING | EH_EXIT_UNWIND | EH_NESTED_CALL))
 569         return ExceptionContinueSearch;
 570
 571     if (wine_frame->u.filter == (void *)1)  /* special hack for page faults */
 572     {
 573         if (record->ExceptionCode != STATUS_ACCESS_VIOLATION)
 574             return ExceptionContinueSearch;
 575     }
 576     else if (wine_frame->u.filter)
 577     {
 578         EXCEPTION_POINTERS ptrs;
 579         ptrs.ExceptionRecord = record;
 580         ptrs.ContextRecord = context;
 581         switch(wine_frame->u.filter( &ptrs ))
 582         {
 583         case EXCEPTION_CONTINUE_SEARCH:
 584             return ExceptionContinueSearch;
 585         case EXCEPTION_CONTINUE_EXECUTION:
 586             return ExceptionContinueExecution;
 587         case EXCEPTION_EXECUTE_HANDLER:
 588             break;
 589         default:
 590             MESSAGE( "Invalid return value from exception filter\n" );
 591             assert( FALSE );
 592         }
 593     }
 594     /* hack to make GetExceptionCode() work in handler */
 595     wine_frame->ExceptionCode   = record->ExceptionCode;
 596     wine_frame->ExceptionRecord = wine_frame;
 597
 598     RtlUnwind( frame, 0, record, 0 );
 599     __wine_pop_frame( frame );
 600     siglongjmp( wine_frame->jmp, 1 );
 601 }
 602
 603
 604 /*************************************************************
 605  *            __wine_finally_handler (NTDLL.@)
 606  *
 607  * Exception handler for try/finally blocks declared in Wine code.
 608  */
 609 DWORD __wine_finally_handler( EXCEPTION_RECORD *record, EXCEPTION_REGISTRATION_RECORD *frame,
 610                               CONTEXT *context, EXCEPTION_REGISTRATION_RECORD **pdispatcher )
 611 {
 612     if (record->ExceptionFlags & (EH_UNWINDING | EH_EXIT_UNWIND))
 613     {
 614         __WINE_FRAME *wine_frame = (__WINE_FRAME *)frame;
 615         wine_frame->u.finally_func( FALSE );
 616     }
 617     return ExceptionContinueSearch;
 618 }
 619
 620
 621 /*************************************************************
 622  *            __wine_spec_unimplemented_stub
 623  *
 624  * ntdll-specific implementation to avoid depending on kernel functions.
 625  * Can be removed once ntdll.spec no longer contains stubs.
 626  */
 627 void __wine_spec_unimplemented_stub( const char *module, const char *function )
 628 {
 629     EXCEPTION_RECORD record;
 630
 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 );
 639 }