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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  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 extern void DECLSPEC_NORETURN __wine_call_from_32_restore_regs( const CONTEXT *context );
  81
  82 /*******************************************************************
  83  *         EXC_RaiseHandler
  84  *
  85  * Handler for exceptions happening inside a handler.
  86  */
  87 static DWORD EXC_RaiseHandler( EXCEPTION_RECORD *rec, EXCEPTION_REGISTRATION_RECORD *frame,
  88                                CONTEXT *context, EXCEPTION_REGISTRATION_RECORD **dispatcher )
  89 {
  90     if (rec->ExceptionFlags & (EH_UNWINDING | EH_EXIT_UNWIND))
  91         return ExceptionContinueSearch;
  92     /* We shouldn't get here so we store faulty frame in dispatcher */
  93     *dispatcher = ((EXC_NESTED_FRAME*)frame)->prevFrame;
  94     return ExceptionNestedException;
  95 }
  96
  97
  98 /*******************************************************************
  99  *         EXC_UnwindHandler
 100  *
 101  * Handler for exceptions happening inside an unwind handler.
 102  */
 103 static DWORD EXC_UnwindHandler( EXCEPTION_RECORD *rec, EXCEPTION_REGISTRATION_RECORD *frame,
 104                                 CONTEXT *context, EXCEPTION_REGISTRATION_RECORD **dispatcher )
 105 {
 106     if (!(rec->ExceptionFlags & (EH_UNWINDING | EH_EXIT_UNWIND)))
 107         return ExceptionContinueSearch;
 108     /* We shouldn't get here so we store faulty frame in dispatcher */
 109     *dispatcher = ((EXC_NESTED_FRAME*)frame)->prevFrame;
 110     return ExceptionCollidedUnwind;
 111 }
 112
 113
 114 /*******************************************************************
 115  *         EXC_CallHandler
 116  *
 117  * Call an exception handler, setting up an exception frame to catch exceptions
 118  * happening during the handler execution.
 119  *
 120  * For i386 this function is implemented in assembler in signal_i386.c.
 121  */
 122 #ifndef __i386__
 123 static DWORD EXC_CallHandler( EXCEPTION_RECORD *record, EXCEPTION_REGISTRATION_RECORD *frame,
 124                               CONTEXT *context, EXCEPTION_REGISTRATION_RECORD **dispatcher,
 125                               PEXCEPTION_HANDLER handler, PEXCEPTION_HANDLER nested_handler)
 126 {
 127     EXC_NESTED_FRAME newframe;
 128     DWORD ret;
 129
 130     newframe.frame.Handler = nested_handler;
 131     newframe.prevFrame     = frame;
 132     __wine_push_frame( &newframe.frame );
 133     TRACE( "calling handler at %p code=%lx flags=%lx\n",
 134            handler, record->ExceptionCode, record->ExceptionFlags );
 135     ret = handler( record, frame, context, dispatcher );
 136     TRACE( "handler returned %lx\n", ret );
 137     __wine_pop_frame( &newframe.frame );
 138     return ret;
 139 }
 140 #else
 141 /* in signal_i386.c */
 142 extern DWORD EXC_CallHandler( EXCEPTION_RECORD *record, EXCEPTION_REGISTRATION_RECORD *frame,
 143                               CONTEXT *context, EXCEPTION_REGISTRATION_RECORD **dispatcher,
 144                               PEXCEPTION_HANDLER handler, PEXCEPTION_HANDLER nested_handler);
 145 #endif
 146
 147 /**********************************************************************
 148  *           wait_suspend
 149  *
 150  * Wait until the thread is no longer suspended.
 151  */
 152 void wait_suspend( CONTEXT *context )
 153 {
 154     LARGE_INTEGER timeout;
 155
 156     /* store the context we got at suspend time */
 157     SERVER_START_REQ( set_thread_context )
 158     {
 159         req->handle  = GetCurrentThread();
 160         req->flags   = CONTEXT_FULL;
 161         req->suspend = 1;
 162         wine_server_add_data( req, context, sizeof(*context) );
 163         wine_server_call( req );
 164     }
 165     SERVER_END_REQ;
 166
 167     /* wait with 0 timeout, will only return once the thread is no longer suspended */
 168     timeout.QuadPart = 0;
 169     NTDLL_wait_for_multiple_objects( 0, NULL, 0, &timeout, 0 );
 170
 171     /* retrieve the new context */
 172     SERVER_START_REQ( get_thread_context )
 173     {
 174         req->handle  = GetCurrentThread();
 175         req->flags   = CONTEXT_FULL;
 176         req->suspend = 1;
 177         wine_server_set_reply( req, context, sizeof(*context) );
 178         wine_server_call( req );
 179     }
 180     SERVER_END_REQ;
 181 }
 182
 183
 184 /**********************************************************************
 185  *           send_debug_event
 186  *
 187  * Send an EXCEPTION_DEBUG_EVENT event to the debugger.
 188  */
 189 static NTSTATUS send_debug_event( EXCEPTION_RECORD *rec, int first_chance, CONTEXT *context )
 190 {
 191     int ret;
 192     HANDLE handle = 0;
 193
 194     if (!NtCurrentTeb()->Peb->BeingDebugged) return 0;  /* no debugger present */
 195
 196     SERVER_START_REQ( queue_exception_event )
 197     {
 198         req->first   = first_chance;
 199         wine_server_add_data( req, context, sizeof(*context) );
 200         wine_server_add_data( req, rec, sizeof(*rec) );
 201         if (!wine_server_call( req )) handle = reply->handle;
 202     }
 203     SERVER_END_REQ;
 204     if (!handle) return 0;
 205
 206     NTDLL_wait_for_multiple_objects( 1, &handle, 0, NULL, 0 );
 207
 208     SERVER_START_REQ( get_exception_status )
 209     {
 210         req->handle = handle;
 211         wine_server_set_reply( req, context, sizeof(*context) );
 212         ret = wine_server_call( req );
 213     }
 214     SERVER_END_REQ;
 215     return ret;
 216 }
 217
 218
 219 /**********************************************************************
 220  *           call_vectored_handlers
 221  *
 222  * Call the vectored handlers chain.
 223  */
 224 static LONG call_vectored_handlers( EXCEPTION_RECORD *rec, CONTEXT *context )
 225 {
 226     struct list *ptr;
 227     LONG ret = EXCEPTION_CONTINUE_SEARCH;
 228     EXCEPTION_POINTERS except_ptrs;
 229
 230     except_ptrs.ExceptionRecord = rec;
 231     except_ptrs.ContextRecord = context;
 232
 233     RtlEnterCriticalSection( &vectored_handlers_section );
 234     LIST_FOR_EACH( ptr, &vectored_handlers )
 235     {
 236         VECTORED_HANDLER *handler = LIST_ENTRY( ptr, VECTORED_HANDLER, entry );
 237         ret = handler->func( &except_ptrs );
 238         if (ret == EXCEPTION_CONTINUE_EXECUTION) break;
 239     }
 240     RtlLeaveCriticalSection( &vectored_handlers_section );
 241     return ret;
 242 }
 243
 244
 245 /**********************************************************************
 246  *           call_stack_handlers
 247  *
 248  * Call the stack handlers chain.
 249  */
 250 static NTSTATUS call_stack_handlers( EXCEPTION_RECORD *rec, CONTEXT *context )
 251 {
 252     EXCEPTION_REGISTRATION_RECORD *frame, *dispatch, *nested_frame;
 253     DWORD res;
 254
 255     frame = NtCurrentTeb()->Tib.ExceptionList;
 256     nested_frame = NULL;
 257     while (frame != (EXCEPTION_REGISTRATION_RECORD*)~0UL)
 258     {
 259         /* Check frame address */
 260         if (((void*)frame < NtCurrentTeb()->Tib.StackLimit) ||
 261             ((void*)(frame+1) > NtCurrentTeb()->Tib.StackBase) ||
 262             (ULONG_PTR)frame & 3)
 263         {
 264             rec->ExceptionFlags |= EH_STACK_INVALID;
 265             break;
 266         }
 267
 268         /* Call handler */
 269         res = EXC_CallHandler( rec, frame, context, &dispatch, frame->Handler, EXC_RaiseHandler );
 270         if (frame == nested_frame)
 271         {
 272             /* no longer nested */
 273             nested_frame = NULL;
 274             rec->ExceptionFlags &= ~EH_NESTED_CALL;
 275         }
 276
 277         switch(res)
 278         {
 279         case ExceptionContinueExecution:
 280             if (!(rec->ExceptionFlags & EH_NONCONTINUABLE)) return STATUS_SUCCESS;
 281             return STATUS_NONCONTINUABLE_EXCEPTION;
 282         case ExceptionContinueSearch:
 283             break;
 284         case ExceptionNestedException:
 285             if (nested_frame < dispatch) nested_frame = dispatch;
 286             rec->ExceptionFlags |= EH_NESTED_CALL;
 287             break;
 288         default:
 289             return STATUS_INVALID_DISPOSITION;
 290         }
 291         frame = frame->Prev;
 292     }
 293     return STATUS_UNHANDLED_EXCEPTION;
 294 }
 295
 296
 297 /*******************************************************************
 298  *              raise_exception
 299  *
 300  * Implementation of NtRaiseException.
 301  */
 302 static NTSTATUS raise_exception( EXCEPTION_RECORD *rec, CONTEXT *context, BOOL first_chance )
 303 {
 304     NTSTATUS status;
 305
 306     if (first_chance)
 307     {
 308         DWORD c;
 309
 310         TRACE( "code=%lx flags=%lx addr=%p\n",
 311                rec->ExceptionCode, rec->ExceptionFlags, rec->ExceptionAddress );
 312         for (c = 0; c < rec->NumberParameters; c++)
 313             TRACE( " info[%ld]=%08lx\n", c, rec->ExceptionInformation[c] );
 314         if (rec->ExceptionCode == EXCEPTION_WINE_STUB)
 315         {
 316             if (rec->ExceptionInformation[1] >> 16)
 317                 MESSAGE( "wine: Call from %p to unimplemented function %s.%s, aborting\n",
 318                          rec->ExceptionAddress,
 319                          (char*)rec->ExceptionInformation[0], (char*)rec->ExceptionInformation[1] );
 320             else
 321                 MESSAGE( "wine: Call from %p to unimplemented function %s.%ld, aborting\n",
 322                          rec->ExceptionAddress,
 323                          (char*)rec->ExceptionInformation[0], rec->ExceptionInformation[1] );
 324         }
 325 #ifdef __i386__
 326         else
 327         {
 328             TRACE(" eax=%08lx ebx=%08lx ecx=%08lx edx=%08lx esi=%08lx edi=%08lx\n",
 329                   context->Eax, context->Ebx, context->Ecx,
 330                   context->Edx, context->Esi, context->Edi );
 331             TRACE(" ebp=%08lx esp=%08lx cs=%04lx ds=%04lx es=%04lx fs=%04lx gs=%04lx flags=%08lx\n",
 332                   context->Ebp, context->Esp, context->SegCs, context->SegDs,
 333                   context->SegEs, context->SegFs, context->SegGs, context->EFlags );
 334         }
 335 #endif
 336         status = send_debug_event( rec, TRUE, context );
 337         if (status == DBG_CONTINUE || status == DBG_EXCEPTION_HANDLED)
 338             return STATUS_SUCCESS;
 339
 340         if (call_vectored_handlers( rec, context ) == EXCEPTION_CONTINUE_EXECUTION)
 341             return STATUS_SUCCESS;
 342
 343         if ((status = call_stack_handlers( rec, context )) != STATUS_UNHANDLED_EXCEPTION)
 344             return status;
 345     }
 346
 347     /* last chance exception */
 348
 349     status = send_debug_event( rec, FALSE, context );
 350     if (status != DBG_CONTINUE)
 351     {
 352         if (rec->ExceptionFlags & EH_STACK_INVALID)
 353             ERR("Exception frame is not in stack limits => unable to dispatch exception.\n");
 354         else if (rec->ExceptionCode == STATUS_NONCONTINUABLE_EXCEPTION)
 355             ERR("Process attempted to continue execution after noncontinuable exception.\n");
 356         else
 357             ERR("Unhandled exception code %lx flags %lx addr %p\n",
 358                 rec->ExceptionCode, rec->ExceptionFlags, rec->ExceptionAddress );
 359         NtTerminateProcess( NtCurrentProcess(), 1 );
 360     }
 361     return STATUS_SUCCESS;
 362 }
 363
 364
 365 /*******************************************************************
 366  *              NtRaiseException (NTDLL.@)
 367  */
 368 NTSTATUS WINAPI NtRaiseException( EXCEPTION_RECORD *rec, CONTEXT *context, BOOL first_chance )
 369 {
 370     NTSTATUS status = raise_exception( rec, context, first_chance );
 371 #ifdef DEFINE_REGS_ENTRYPOINT
 372     if (status == STATUS_SUCCESS) __wine_call_from_32_restore_regs( context );
 373 #endif
 374     return status;
 375 }
 376
 377 /***********************************************************************
 378  *              RtlRaiseException (NTDLL.@)
 379  */
 380 void WINAPI __regs_RtlRaiseException( EXCEPTION_RECORD *rec, CONTEXT *context )
 381 {
 382     NTSTATUS status = raise_exception( rec, context, TRUE );
 383     if (status != STATUS_SUCCESS)
 384     {
 385         EXCEPTION_RECORD newrec;
 386         newrec.ExceptionCode    = status;
 387         newrec.ExceptionFlags   = EH_NONCONTINUABLE;
 388         newrec.ExceptionRecord  = rec;
 389         newrec.NumberParameters = 0;
 390         RtlRaiseException( &newrec );  /* never returns */
 391     }
 392 }
 393
 394 /**********************************************************************/
 395
 396 #ifdef DEFINE_REGS_ENTRYPOINT
 397 DEFINE_REGS_ENTRYPOINT( RtlRaiseException, 4, 4 );
 398 #else
 399 void WINAPI RtlRaiseException( EXCEPTION_RECORD *rec )
 400 {
 401     CONTEXT context;
 402     memset( &context, 0, sizeof(context) );
 403     __regs_RtlRaiseException( rec, &context );
 404 }
 405 #endif
 406
 407
 408 /*******************************************************************
 409  *              RtlUnwind (NTDLL.@)
 410  */
 411 void WINAPI __regs_RtlUnwind( EXCEPTION_REGISTRATION_RECORD* pEndFrame, PVOID unusedEip,
 412                               PEXCEPTION_RECORD pRecord, PVOID returnEax, CONTEXT *context )
 413 {
 414     EXCEPTION_RECORD record, newrec;
 415     EXCEPTION_REGISTRATION_RECORD *frame, *dispatch;
 416
 417 #ifdef __i386__
 418     context->Eax = (DWORD)returnEax;
 419 #endif
 420
 421     /* build an exception record, if we do not have one */
 422     if (!pRecord)
 423     {
 424         record.ExceptionCode    = STATUS_UNWIND;
 425         record.ExceptionFlags   = 0;
 426         record.ExceptionRecord  = NULL;
 427         record.ExceptionAddress = GET_IP(context);
 428         record.NumberParameters = 0;
 429         pRecord = &record;
 430     }
 431
 432     pRecord->ExceptionFlags |= EH_UNWINDING | (pEndFrame ? 0 : EH_EXIT_UNWIND);
 433
 434     TRACE( "code=%lx flags=%lx\n", pRecord->ExceptionCode, pRecord->ExceptionFlags );
 435
 436     /* get chain of exception frames */
 437     frame = NtCurrentTeb()->Tib.ExceptionList;
 438     while ((frame != (EXCEPTION_REGISTRATION_RECORD*)~0UL) && (frame != pEndFrame))
 439     {
 440         /* Check frame address */
 441         if (pEndFrame && (frame > pEndFrame))
 442         {
 443             newrec.ExceptionCode    = STATUS_INVALID_UNWIND_TARGET;
 444             newrec.ExceptionFlags   = EH_NONCONTINUABLE;
 445             newrec.ExceptionRecord  = pRecord;
 446             newrec.NumberParameters = 0;
 447             RtlRaiseException( &newrec );  /* never returns */
 448         }
 449         if (((void*)frame < NtCurrentTeb()->Tib.StackLimit) ||
 450             ((void*)(frame+1) > NtCurrentTeb()->Tib.StackBase) ||
 451             (UINT_PTR)frame & 3)
 452         {
 453             newrec.ExceptionCode    = STATUS_BAD_STACK;
 454             newrec.ExceptionFlags   = EH_NONCONTINUABLE;
 455             newrec.ExceptionRecord  = pRecord;
 456             newrec.NumberParameters = 0;
 457             RtlRaiseException( &newrec );  /* never returns */
 458         }
 459
 460         /* Call handler */
 461         switch(EXC_CallHandler( pRecord, frame, context, &dispatch,
 462                                 frame->Handler, EXC_UnwindHandler ))
 463         {
 464         case ExceptionContinueSearch:
 465             break;
 466         case ExceptionCollidedUnwind:
 467             frame = dispatch;
 468             break;
 469         default:
 470             newrec.ExceptionCode    = STATUS_INVALID_DISPOSITION;
 471             newrec.ExceptionFlags   = EH_NONCONTINUABLE;
 472             newrec.ExceptionRecord  = pRecord;
 473             newrec.NumberParameters = 0;
 474             RtlRaiseException( &newrec );  /* never returns */
 475             break;
 476         }
 477         frame = __wine_pop_frame( frame );
 478     }
 479 }
 480
 481 /**********************************************************************/
 482
 483 #ifdef DEFINE_REGS_ENTRYPOINT
 484 DEFINE_REGS_ENTRYPOINT( RtlUnwind, 16, 16 );
 485 #else
 486 void WINAPI RtlUnwind( PVOID pEndFrame, PVOID unusedEip,
 487                        PEXCEPTION_RECORD pRecord, PVOID returnEax )
 488 {
 489     CONTEXT context;
 490     memset( &context, 0, sizeof(context) );
 491     __regs_RtlUnwind( pEndFrame, unusedEip, pRecord, returnEax, &context );
 492 }
 493 #endif
 494
 495
 496 /***********************************************************************
 497  *            RtlRaiseStatus  (NTDLL.@)
 498  *
 499  * Raise an exception with ExceptionCode = status
 500  */
 501 void WINAPI RtlRaiseStatus( NTSTATUS status )
 502 {
 503     EXCEPTION_RECORD ExceptionRec;
 504
 505     ExceptionRec.ExceptionCode    = status;
 506     ExceptionRec.ExceptionFlags   = EH_NONCONTINUABLE;
 507     ExceptionRec.ExceptionRecord  = NULL;
 508     ExceptionRec.NumberParameters = 0;
 509     RtlRaiseException( &ExceptionRec );
 510 }
 511
 512
 513 /*******************************************************************
 514  *         RtlAddVectoredExceptionHandler   (NTDLL.@)
 515  */
 516 PVOID WINAPI RtlAddVectoredExceptionHandler( ULONG first, PVECTORED_EXCEPTION_HANDLER func )
 517 {
 518     VECTORED_HANDLER *handler = RtlAllocateHeap( GetProcessHeap(), 0, sizeof(*handler) );
 519     if (handler)
 520     {
 521         handler->func = func;
 522         RtlEnterCriticalSection( &vectored_handlers_section );
 523         if (first) list_add_head( &vectored_handlers, &handler->entry );
 524         else list_add_tail( &vectored_handlers, &handler->entry );
 525         RtlLeaveCriticalSection( &vectored_handlers_section );
 526     }
 527     return handler;
 528 }
 529
 530
 531 /*******************************************************************
 532  *         RtlRemoveVectoredExceptionHandler   (NTDLL.@)
 533  */
 534 ULONG WINAPI RtlRemoveVectoredExceptionHandler( PVOID handler )
 535 {
 536     struct list *ptr;
 537     ULONG ret = FALSE;
 538
 539     RtlEnterCriticalSection( &vectored_handlers_section );
 540     LIST_FOR_EACH( ptr, &vectored_handlers )
 541     {
 542         VECTORED_HANDLER *curr_handler = LIST_ENTRY( ptr, VECTORED_HANDLER, entry );
 543         if (curr_handler == handler)
 544         {
 545             list_remove( ptr );
 546             ret = TRUE;
 547             break;
 548         }
 549     }
 550     RtlLeaveCriticalSection( &vectored_handlers_section );
 551     if (ret) RtlFreeHeap( GetProcessHeap(), 0, handler );
 552     return ret;
 553 }
 554
 555
 556 /*************************************************************
 557  *            __wine_exception_handler (NTDLL.@)
 558  *
 559  * Exception handler for exception blocks declared in Wine code.
 560  */
 561 DWORD __wine_exception_handler( EXCEPTION_RECORD *record, EXCEPTION_REGISTRATION_RECORD *frame,
 562                                 CONTEXT *context, EXCEPTION_REGISTRATION_RECORD **pdispatcher )
 563 {
 564     __WINE_FRAME *wine_frame = (__WINE_FRAME *)frame;
 565
 566     if (record->ExceptionFlags & (EH_UNWINDING | EH_EXIT_UNWIND | EH_NESTED_CALL))
 567         return ExceptionContinueSearch;
 568
 569     if (wine_frame->u.filter == (void *)1)  /* special hack for page faults */
 570     {
 571         if (record->ExceptionCode != STATUS_ACCESS_VIOLATION)
 572             return ExceptionContinueSearch;
 573     }
 574     else if (wine_frame->u.filter)
 575     {
 576         EXCEPTION_POINTERS ptrs;
 577         ptrs.ExceptionRecord = record;
 578         ptrs.ContextRecord = context;
 579         switch(wine_frame->u.filter( &ptrs ))
 580         {
 581         case EXCEPTION_CONTINUE_SEARCH:
 582             return ExceptionContinueSearch;
 583         case EXCEPTION_CONTINUE_EXECUTION:
 584             return ExceptionContinueExecution;
 585         case EXCEPTION_EXECUTE_HANDLER:
 586             break;
 587         default:
 588             MESSAGE( "Invalid return value from exception filter\n" );
 589             assert( FALSE );
 590         }
 591     }
 592     /* hack to make GetExceptionCode() work in handler */
 593     wine_frame->ExceptionCode   = record->ExceptionCode;
 594     wine_frame->ExceptionRecord = wine_frame;
 595
 596     RtlUnwind( frame, 0, record, 0 );
 597     __wine_pop_frame( frame );
 598     siglongjmp( wine_frame->jmp, 1 );
 599 }
 600
 601
 602 /*************************************************************
 603  *            __wine_finally_handler (NTDLL.@)
 604  *
 605  * Exception handler for try/finally blocks declared in Wine code.
 606  */
 607 DWORD __wine_finally_handler( EXCEPTION_RECORD *record, EXCEPTION_REGISTRATION_RECORD *frame,
 608                               CONTEXT *context, EXCEPTION_REGISTRATION_RECORD **pdispatcher )
 609 {
 610     if (record->ExceptionFlags & (EH_UNWINDING | EH_EXIT_UNWIND))
 611     {
 612         __WINE_FRAME *wine_frame = (__WINE_FRAME *)frame;
 613         wine_frame->u.finally_func( FALSE );
 614     }
 615     return ExceptionContinueSearch;
 616 }
 617
 618
 619 /*************************************************************
 620  *            __wine_spec_unimplemented_stub
 621  *
 622  * ntdll-specific implementation to avoid depending on kernel functions.
 623  * Can be removed once ntdll.spec no longer contains stubs.
 624  */
 625 void __wine_spec_unimplemented_stub( const char *module, const char *function )
 626 {
 627     EXCEPTION_RECORD record;
 628
 629     record.ExceptionCode    = EXCEPTION_WINE_STUB;
 630     record.ExceptionFlags   = EH_NONCONTINUABLE;
 631     record.ExceptionRecord  = NULL;
 632     record.ExceptionAddress = __wine_spec_unimplemented_stub;
 633     record.NumberParameters = 2;
 634     record.ExceptionInformation[0] = (ULONG_PTR)module;
 635     record.ExceptionInformation[1] = (ULONG_PTR)function;
 636     RtlRaiseException( &record );
 637 }