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 <errno.h>
  27 #include <signal.h>
  28 #include <stdarg.h>
  29
  30 #include "ntstatus.h"
  31 #define WIN32_NO_STATUS
  32 #include "windef.h"
  33 #include "winternl.h"
  34 #include "wine/exception.h"
  35 #include "wine/server.h"
  36 #include "wine/list.h"
  37 #include "wine/debug.h"
  38 #include "excpt.h"
  39 #include "ntdll_misc.h"
  40
  41 WINE_DEFAULT_DEBUG_CHANNEL(seh);
  42
  43 /* Exception record for handling exceptions happening inside exception handlers */
  44 typedef struct
  45 {
  46     EXCEPTION_REGISTRATION_RECORD frame;
  47     EXCEPTION_REGISTRATION_RECORD *prevFrame;
  48 } EXC_NESTED_FRAME;
  49
  50 typedef struct
  51 {
  52     struct list                 entry;
  53     PVECTORED_EXCEPTION_HANDLER func;
  54 } VECTORED_HANDLER;
  55
  56 static struct list vectored_handlers = LIST_INIT(vectored_handlers);
  57
  58 static RTL_CRITICAL_SECTION vectored_handlers_section;
  59 static RTL_CRITICAL_SECTION_DEBUG critsect_debug =
  60 {
  61     0, 0, &vectored_handlers_section,
  62     { &critsect_debug.ProcessLocksList, &critsect_debug.ProcessLocksList },
  63       0, 0, { (DWORD_PTR)(__FILE__ ": vectored_handlers_section") }
  64 };
  65 static RTL_CRITICAL_SECTION vectored_handlers_section = { &critsect_debug, -1, 0, 0, 0, 0 };
  66
  67 #ifdef __i386__
  68 # define GET_IP(context) ((LPVOID)(context)->Eip)
  69 #elif defined(__sparc__)
  70 # define GET_IP(context) ((LPVOID)(context)->pc)
  71 #elif defined(__powerpc__)
  72 # define GET_IP(context) ((LPVOID)(context)->Iar)
  73 #elif defined(__ALPHA__)
  74 # define GET_IP(context) ((LPVOID)(context)->Fir)
  75 #elif defined(__x86_64__)
  76 # define GET_IP(context) ((LPVOID)(context)->Rip)
  77 #else
  78 # error You must define GET_IP for this CPU
  79 #endif
  80
  81 /*******************************************************************
  82  *         EXC_RaiseHandler
  83  *
  84  * Handler for exceptions happening inside a handler.
  85  */
  86 static DWORD EXC_RaiseHandler( EXCEPTION_RECORD *rec, EXCEPTION_REGISTRATION_RECORD *frame,
  87                                CONTEXT *context, EXCEPTION_REGISTRATION_RECORD **dispatcher )
  88 {
  89     if (rec->ExceptionFlags & (EH_UNWINDING | EH_EXIT_UNWIND))
  90         return ExceptionContinueSearch;
  91     /* We shouldn't get here so we store faulty frame in dispatcher */
  92     *dispatcher = ((EXC_NESTED_FRAME*)frame)->prevFrame;
  93     return ExceptionNestedException;
  94 }
  95
  96
  97 /*******************************************************************
  98  *         EXC_UnwindHandler
  99  *
 100  * Handler for exceptions happening inside an unwind handler.
 101  */
 102 static DWORD EXC_UnwindHandler( EXCEPTION_RECORD *rec, EXCEPTION_REGISTRATION_RECORD *frame,
 103                                 CONTEXT *context, EXCEPTION_REGISTRATION_RECORD **dispatcher )
 104 {
 105     if (!(rec->ExceptionFlags & (EH_UNWINDING | EH_EXIT_UNWIND)))
 106         return ExceptionContinueSearch;
 107     /* We shouldn't get here so we store faulty frame in dispatcher */
 108     *dispatcher = ((EXC_NESTED_FRAME*)frame)->prevFrame;
 109     return ExceptionCollidedUnwind;
 110 }
 111
 112
 113 /*******************************************************************
 114  *         EXC_CallHandler
 115  *
 116  * Call an exception handler, setting up an exception frame to catch exceptions
 117  * happening during the handler execution.
 118  *
 119  * For i386 this function is implemented in assembler in signal_i386.c.
 120  */
 121 #ifndef __i386__
 122 static DWORD EXC_CallHandler( EXCEPTION_RECORD *record, EXCEPTION_REGISTRATION_RECORD *frame,
 123                               CONTEXT *context, EXCEPTION_REGISTRATION_RECORD **dispatcher,
 124                               PEXCEPTION_HANDLER handler, PEXCEPTION_HANDLER nested_handler)
 125 {
 126     EXC_NESTED_FRAME newframe;
 127     DWORD ret;
 128
 129     newframe.frame.Handler = nested_handler;
 130     newframe.prevFrame     = frame;
 131     __wine_push_frame( &newframe.frame );
 132     ret = handler( record, frame, context, dispatcher );
 133     __wine_pop_frame( &newframe.frame );
 134     return ret;
 135 }
 136 #else
 137 /* in signal_i386.c */
 138 extern DWORD EXC_CallHandler( EXCEPTION_RECORD *record, EXCEPTION_REGISTRATION_RECORD *frame,
 139                               CONTEXT *context, EXCEPTION_REGISTRATION_RECORD **dispatcher,
 140                               PEXCEPTION_HANDLER handler, PEXCEPTION_HANDLER nested_handler);
 141 #endif
 142
 143 /**********************************************************************
 144  *           wait_suspend
 145  *
 146  * Wait until the thread is no longer suspended.
 147  */
 148 void wait_suspend( CONTEXT *context )
 149 {
 150     LARGE_INTEGER timeout;
 151     int saved_errno = errno;
 152
 153     /* store the context we got at suspend time */
 154     SERVER_START_REQ( set_thread_context )
 155     {
 156         req->handle  = wine_server_obj_handle( GetCurrentThread() );
 157         req->flags   = CONTEXT_FULL;
 158         req->suspend = 1;
 159         wine_server_add_data( req, context, sizeof(*context) );
 160         wine_server_call( req );
 161     }
 162     SERVER_END_REQ;
 163
 164     /* wait with 0 timeout, will only return once the thread is no longer suspended */
 165     timeout.QuadPart = 0;
 166     NTDLL_wait_for_multiple_objects( 0, NULL, SELECT_INTERRUPTIBLE, &timeout, 0 );
 167
 168     /* retrieve the new context */
 169     SERVER_START_REQ( get_thread_context )
 170     {
 171         req->handle  = wine_server_obj_handle( GetCurrentThread() );
 172         req->flags   = CONTEXT_FULL;
 173         req->suspend = 1;
 174         wine_server_set_reply( req, context, sizeof(*context) );
 175         wine_server_call( req );
 176     }
 177     SERVER_END_REQ;
 178
 179     errno = saved_errno;
 180 }
 181
 182
 183 /**********************************************************************
 184  *           send_debug_event
 185  *
 186  * Send an EXCEPTION_DEBUG_EVENT event to the debugger.
 187  */
 188 static NTSTATUS send_debug_event( EXCEPTION_RECORD *rec, int first_chance, CONTEXT *context )
 189 {
 190     int ret;
 191     HANDLE handle = 0;
 192
 193     if (!NtCurrentTeb()->Peb->BeingDebugged) return 0;  /* no debugger present */
 194
 195     SERVER_START_REQ( queue_exception_event )
 196     {
 197         req->first   = first_chance;
 198         wine_server_add_data( req, context, sizeof(*context) );
 199         wine_server_add_data( req, rec, sizeof(*rec) );
 200         if (!wine_server_call( req )) handle = wine_server_ptr_handle( reply->handle );
 201     }
 202     SERVER_END_REQ;
 203     if (!handle) return 0;
 204
 205     NTDLL_wait_for_multiple_objects( 1, &handle, SELECT_INTERRUPTIBLE, NULL, 0 );
 206
 207     SERVER_START_REQ( get_exception_status )
 208     {
 209         req->handle = wine_server_obj_handle( handle );
 210         wine_server_set_reply( req, context, sizeof(*context) );
 211         ret = wine_server_call( req );
 212     }
 213     SERVER_END_REQ;
 214     return ret;
 215 }
 216
 217
 218 /**********************************************************************
 219  *           call_vectored_handlers
 220  *
 221  * Call the vectored handlers chain.
 222  */
 223 static LONG call_vectored_handlers( EXCEPTION_RECORD *rec, CONTEXT *context )
 224 {
 225     struct list *ptr;
 226     LONG ret = EXCEPTION_CONTINUE_SEARCH;
 227     EXCEPTION_POINTERS except_ptrs;
 228
 229     except_ptrs.ExceptionRecord = rec;
 230     except_ptrs.ContextRecord = context;
 231
 232     RtlEnterCriticalSection( &vectored_handlers_section );
 233     LIST_FOR_EACH( ptr, &vectored_handlers )
 234     {
 235         VECTORED_HANDLER *handler = LIST_ENTRY( ptr, VECTORED_HANDLER, entry );
 236         ret = handler->func( &except_ptrs );
 237         if (ret == EXCEPTION_CONTINUE_EXECUTION) break;
 238     }
 239     RtlLeaveCriticalSection( &vectored_handlers_section );
 240     return ret;
 241 }
 242
 243
 244 /**********************************************************************
 245  *           call_stack_handlers
 246  *
 247  * Call the stack handlers chain.
 248  */
 249 static NTSTATUS call_stack_handlers( EXCEPTION_RECORD *rec, CONTEXT *context )
 250 {
 251     EXCEPTION_REGISTRATION_RECORD *frame, *dispatch, *nested_frame;
 252     DWORD res;
 253
 254     frame = NtCurrentTeb()->Tib.ExceptionList;
 255     nested_frame = NULL;
 256     while (frame != (EXCEPTION_REGISTRATION_RECORD*)~0UL)
 257     {
 258         /* Check frame address */
 259         if (((void*)frame < NtCurrentTeb()->Tib.StackLimit) ||
 260             ((void*)(frame+1) > NtCurrentTeb()->Tib.StackBase) ||
 261             (ULONG_PTR)frame & 3)
 262         {
 263             rec->ExceptionFlags |= EH_STACK_INVALID;
 264             break;
 265         }
 266
 267         /* Call handler */
 268         TRACE( "calling handler at %p code=%x flags=%x\n",
 269                frame->Handler, rec->ExceptionCode, rec->ExceptionFlags );
 270         res = EXC_CallHandler( rec, frame, context, &dispatch, frame->Handler, EXC_RaiseHandler );
 271         TRACE( "handler at %p returned %x\n", frame->Handler, res );
 272
 273         if (frame == nested_frame)
 274         {
 275             /* no longer nested */
 276             nested_frame = NULL;
 277             rec->ExceptionFlags &= ~EH_NESTED_CALL;
 278         }
 279
 280         switch(res)
 281         {
 282         case ExceptionContinueExecution:
 283             if (!(rec->ExceptionFlags & EH_NONCONTINUABLE)) return STATUS_SUCCESS;
 284             return STATUS_NONCONTINUABLE_EXCEPTION;
 285         case ExceptionContinueSearch:
 286             break;
 287         case ExceptionNestedException:
 288             if (nested_frame < dispatch) nested_frame = dispatch;
 289             rec->ExceptionFlags |= EH_NESTED_CALL;
 290             break;
 291         default:
 292             return STATUS_INVALID_DISPOSITION;
 293         }
 294         frame = frame->Prev;
 295     }
 296     return STATUS_UNHANDLED_EXCEPTION;
 297 }
 298
 299
 300 /*******************************************************************
 301  *              raise_exception
 302  *
 303  * Implementation of NtRaiseException.
 304  */
 305 static NTSTATUS raise_exception( EXCEPTION_RECORD *rec, CONTEXT *context, BOOL first_chance )
 306 {
 307     NTSTATUS status;
 308
 309     if (first_chance)
 310     {
 311         DWORD c;
 312
 313         TRACE( "code=%x flags=%x addr=%p\n",
 314                rec->ExceptionCode, rec->ExceptionFlags, rec->ExceptionAddress );
 315         for (c = 0; c < rec->NumberParameters; c++)
 316             TRACE( " info[%d]=%08lx\n", c, rec->ExceptionInformation[c] );
 317         if (rec->ExceptionCode == EXCEPTION_WINE_STUB)
 318         {
 319             if (rec->ExceptionInformation[1] >> 16)
 320                 MESSAGE( "wine: Call from %p to unimplemented function %s.%s, aborting\n",
 321                          rec->ExceptionAddress,
 322                          (char*)rec->ExceptionInformation[0], (char*)rec->ExceptionInformation[1] );
 323             else
 324                 MESSAGE( "wine: Call from %p to unimplemented function %s.%ld, aborting\n",
 325                          rec->ExceptionAddress,
 326                          (char*)rec->ExceptionInformation[0], rec->ExceptionInformation[1] );
 327         }
 328 #ifdef __i386__
 329         else
 330         {
 331             TRACE(" eax=%08x ebx=%08x ecx=%08x edx=%08x esi=%08x edi=%08x\n",
 332                   context->Eax, context->Ebx, context->Ecx,
 333                   context->Edx, context->Esi, context->Edi );
 334             TRACE(" ebp=%08x esp=%08x cs=%04x ds=%04x es=%04x fs=%04x gs=%04x flags=%08x\n",
 335                   context->Ebp, context->Esp, context->SegCs, context->SegDs,
 336                   context->SegEs, context->SegFs, context->SegGs, context->EFlags );
 337         }
 338 #endif
 339         status = send_debug_event( rec, TRUE, context );
 340         if (status == DBG_CONTINUE || status == DBG_EXCEPTION_HANDLED)
 341             return STATUS_SUCCESS;
 342
 343 #ifdef __i386__
 344         /* fix up instruction pointer in context for EXCEPTION_BREAKPOINT */
 345         if (rec->ExceptionCode == EXCEPTION_BREAKPOINT) context->Eip--;
 346 #endif
 347
 348         if (call_vectored_handlers( rec, context ) == EXCEPTION_CONTINUE_EXECUTION)
 349             return STATUS_SUCCESS;
 350
 351         if ((status = call_stack_handlers( rec, context )) != STATUS_UNHANDLED_EXCEPTION)
 352             return status;
 353     }
 354
 355     /* last chance exception */
 356
 357     status = send_debug_event( rec, FALSE, context );
 358     if (status != DBG_CONTINUE)
 359     {
 360         if (rec->ExceptionFlags & EH_STACK_INVALID)
 361             ERR("Exception frame is not in stack limits => unable to dispatch exception.\n");
 362         else if (rec->ExceptionCode == STATUS_NONCONTINUABLE_EXCEPTION)
 363             ERR("Process attempted to continue execution after noncontinuable exception.\n");
 364         else
 365             ERR("Unhandled exception code %x flags %x addr %p\n",
 366                 rec->ExceptionCode, rec->ExceptionFlags, rec->ExceptionAddress );
 367         NtTerminateProcess( NtCurrentProcess(), 1 );
 368     }
 369     return STATUS_SUCCESS;
 370 }
 371
 372
 373 /*******************************************************************
 374  *              NtRaiseException (NTDLL.@)
 375  */
 376 NTSTATUS WINAPI NtRaiseException( EXCEPTION_RECORD *rec, CONTEXT *context, BOOL first_chance )
 377 {
 378     NTSTATUS status = raise_exception( rec, context, first_chance );
 379     if (status == STATUS_SUCCESS) NtSetContextThread( GetCurrentThread(), context );
 380     return status;
 381 }
 382
 383 /***********************************************************************
 384  *              RtlCaptureContext (NTDLL.@)
 385  */
 386 void WINAPI __regs_RtlCaptureContext( CONTEXT *context_out, CONTEXT *context_in )
 387 {
 388     *context_out = *context_in;
 389 }
 390
 391 /**********************************************************************/
 392
 393 #ifdef DEFINE_REGS_ENTRYPOINT
 394 DEFINE_REGS_ENTRYPOINT( RtlCaptureContext, 4, 4 )
 395 #else
 396 void WINAPI RtlCaptureContext( CONTEXT *context_out )
 397 {
 398     memset( context_out, 0, sizeof(*context_out) );
 399 }
 400 #endif
 401
 402
 403 /***********************************************************************
 404  *              RtlRaiseException (NTDLL.@)
 405  */
 406 void WINAPI __regs_RtlRaiseException( EXCEPTION_RECORD *rec, CONTEXT *context )
 407 {
 408     NTSTATUS status = raise_exception( rec, context, TRUE );
 409     if (status != STATUS_SUCCESS)
 410     {
 411         EXCEPTION_RECORD newrec;
 412         newrec.ExceptionCode    = status;
 413         newrec.ExceptionFlags   = EH_NONCONTINUABLE;
 414         newrec.ExceptionRecord  = rec;
 415         newrec.NumberParameters = 0;
 416         RtlRaiseException( &newrec );  /* never returns */
 417     }
 418 }
 419
 420 /**********************************************************************/
 421
 422 #ifdef DEFINE_REGS_ENTRYPOINT
 423 DEFINE_REGS_ENTRYPOINT( RtlRaiseException, 4, 4 )
 424 #else
 425 void WINAPI RtlRaiseException( EXCEPTION_RECORD *rec )
 426 {
 427     CONTEXT context;
 428     RtlCaptureContext( &context );
 429     __regs_RtlRaiseException( rec, &context );
 430 }
 431 #endif
 432
 433
 434 /*******************************************************************
 435  *              RtlUnwind (NTDLL.@)
 436  */
 437 void WINAPI __regs_RtlUnwind( EXCEPTION_REGISTRATION_RECORD* pEndFrame, PVOID unusedEip,
 438                               PEXCEPTION_RECORD pRecord, PVOID returnEax, CONTEXT *context )
 439 {
 440     EXCEPTION_RECORD record, newrec;
 441     EXCEPTION_REGISTRATION_RECORD *frame, *dispatch;
 442     DWORD res;
 443
 444 #ifdef __i386__
 445     context->Eax = (DWORD)returnEax;
 446 #endif
 447
 448     /* build an exception record, if we do not have one */
 449     if (!pRecord)
 450     {
 451         record.ExceptionCode    = STATUS_UNWIND;
 452         record.ExceptionFlags   = 0;
 453         record.ExceptionRecord  = NULL;
 454         record.ExceptionAddress = GET_IP(context);
 455         record.NumberParameters = 0;
 456         pRecord = &record;
 457     }
 458
 459     pRecord->ExceptionFlags |= EH_UNWINDING | (pEndFrame ? 0 : EH_EXIT_UNWIND);
 460
 461     TRACE( "code=%x flags=%x\n", pRecord->ExceptionCode, pRecord->ExceptionFlags );
 462
 463     /* get chain of exception frames */
 464     frame = NtCurrentTeb()->Tib.ExceptionList;
 465     while ((frame != (EXCEPTION_REGISTRATION_RECORD*)~0UL) && (frame != pEndFrame))
 466     {
 467         /* Check frame address */
 468         if (pEndFrame && (frame > pEndFrame))
 469         {
 470             newrec.ExceptionCode    = STATUS_INVALID_UNWIND_TARGET;
 471             newrec.ExceptionFlags   = EH_NONCONTINUABLE;
 472             newrec.ExceptionRecord  = pRecord;
 473             newrec.NumberParameters = 0;
 474             RtlRaiseException( &newrec );  /* never returns */
 475         }
 476         if (((void*)frame < NtCurrentTeb()->Tib.StackLimit) ||
 477             ((void*)(frame+1) > NtCurrentTeb()->Tib.StackBase) ||
 478             (UINT_PTR)frame & 3)
 479         {
 480             newrec.ExceptionCode    = STATUS_BAD_STACK;
 481             newrec.ExceptionFlags   = EH_NONCONTINUABLE;
 482             newrec.ExceptionRecord  = pRecord;
 483             newrec.NumberParameters = 0;
 484             RtlRaiseException( &newrec );  /* never returns */
 485         }
 486
 487         /* Call handler */
 488         TRACE( "calling handler at %p code=%x flags=%x\n",
 489                frame->Handler, pRecord->ExceptionCode, pRecord->ExceptionFlags );
 490         res = EXC_CallHandler( pRecord, frame, context, &dispatch, frame->Handler, EXC_UnwindHandler );
 491         TRACE( "handler at %p returned %x\n", frame->Handler, res );
 492
 493         switch(res)
 494         {
 495         case ExceptionContinueSearch:
 496             break;
 497         case ExceptionCollidedUnwind:
 498             frame = dispatch;
 499             break;
 500         default:
 501             newrec.ExceptionCode    = STATUS_INVALID_DISPOSITION;
 502             newrec.ExceptionFlags   = EH_NONCONTINUABLE;
 503             newrec.ExceptionRecord  = pRecord;
 504             newrec.NumberParameters = 0;
 505             RtlRaiseException( &newrec );  /* never returns */
 506             break;
 507         }
 508         frame = __wine_pop_frame( frame );
 509     }
 510 }
 511
 512 /**********************************************************************/
 513
 514 #ifdef DEFINE_REGS_ENTRYPOINT
 515 DEFINE_REGS_ENTRYPOINT( RtlUnwind, 16, 16 )
 516 #else
 517 void WINAPI RtlUnwind( PVOID pEndFrame, PVOID unusedEip,
 518                        PEXCEPTION_RECORD pRecord, PVOID returnEax )
 519 {
 520     CONTEXT context;
 521     RtlCaptureContext( &context );
 522     __regs_RtlUnwind( pEndFrame, unusedEip, pRecord, returnEax, &context );
 523 }
 524 #endif
 525
 526
 527 /***********************************************************************
 528  *            RtlRaiseStatus  (NTDLL.@)
 529  *
 530  * Raise an exception with ExceptionCode = status
 531  */
 532 void WINAPI RtlRaiseStatus( NTSTATUS status )
 533 {
 534     EXCEPTION_RECORD ExceptionRec;
 535
 536     ExceptionRec.ExceptionCode    = status;
 537     ExceptionRec.ExceptionFlags   = EH_NONCONTINUABLE;
 538     ExceptionRec.ExceptionRecord  = NULL;
 539     ExceptionRec.NumberParameters = 0;
 540     RtlRaiseException( &ExceptionRec );
 541 }
 542
 543
 544 /*******************************************************************
 545  *         RtlAddVectoredExceptionHandler   (NTDLL.@)
 546  */
 547 PVOID WINAPI RtlAddVectoredExceptionHandler( ULONG first, PVECTORED_EXCEPTION_HANDLER func )
 548 {
 549     VECTORED_HANDLER *handler = RtlAllocateHeap( GetProcessHeap(), 0, sizeof(*handler) );
 550     if (handler)
 551     {
 552         handler->func = func;
 553         RtlEnterCriticalSection( &vectored_handlers_section );
 554         if (first) list_add_head( &vectored_handlers, &handler->entry );
 555         else list_add_tail( &vectored_handlers, &handler->entry );
 556         RtlLeaveCriticalSection( &vectored_handlers_section );
 557     }
 558     return handler;
 559 }
 560
 561
 562 /*******************************************************************
 563  *         RtlRemoveVectoredExceptionHandler   (NTDLL.@)
 564  */
 565 ULONG WINAPI RtlRemoveVectoredExceptionHandler( PVOID handler )
 566 {
 567     struct list *ptr;
 568     ULONG ret = FALSE;
 569
 570     RtlEnterCriticalSection( &vectored_handlers_section );
 571     LIST_FOR_EACH( ptr, &vectored_handlers )
 572     {
 573         VECTORED_HANDLER *curr_handler = LIST_ENTRY( ptr, VECTORED_HANDLER, entry );
 574         if (curr_handler == handler)
 575         {
 576             list_remove( ptr );
 577             ret = TRUE;
 578             break;
 579         }
 580     }
 581     RtlLeaveCriticalSection( &vectored_handlers_section );
 582     if (ret) RtlFreeHeap( GetProcessHeap(), 0, handler );
 583     return ret;
 584 }
 585
 586
 587 /*************************************************************
 588  *            __wine_spec_unimplemented_stub
 589  *
 590  * ntdll-specific implementation to avoid depending on kernel functions.
 591  * Can be removed once ntdll.spec no longer contains stubs.
 592  */
 593 void __wine_spec_unimplemented_stub( const char *module, const char *function )
 594 {
 595     EXCEPTION_RECORD record;
 596
 597     record.ExceptionCode    = EXCEPTION_WINE_STUB;
 598     record.ExceptionFlags   = EH_NONCONTINUABLE;
 599     record.ExceptionRecord  = NULL;
 600     record.ExceptionAddress = __wine_spec_unimplemented_stub;
 601     record.NumberParameters = 2;
 602     record.ExceptionInformation[0] = (ULONG_PTR)module;
 603     record.ExceptionInformation[1] = (ULONG_PTR)function;
 604     RtlRaiseException( &record );
 605 }