dlls/ntdll/exception.c

   1 /*
   2  * NT exception handling routines
   3  *
   4  * Copyright 1999 Turchanov Sergey
   5  * Copyright 1999 Alexandre Julliard
   6  */
   7
   8 #include <signal.h>
   9 #include "winnt.h"
  10 #include "ntddk.h"
  11 #include "process.h"
  12 #include "global.h"
  13 #include "wine/exception.h"
  14 #include "stackframe.h"
  15 #include "sig_context.h"
  16 #include "miscemu.h"
  17 #include "debugtools.h"
  18
  19 DEFAULT_DEBUG_CHANNEL(seh)
  20
  21 /* Exception record for handling exceptions happening inside exception handlers */
  22 typedef struct
  23 {
  24     EXCEPTION_FRAME frame;
  25     EXCEPTION_FRAME *prevFrame;
  26 } EXC_NESTED_FRAME;
  27
  28 #ifdef __i386__
  29 # define GET_IP(context) ((LPVOID)EIP_reg(context))
  30 #else
  31 # define GET_IP(context) ((LPVOID)0)
  32 #endif  /* __i386__ */
  33
  34 /* Default hook for built-in debugger */
  35 static DWORD default_hook( EXCEPTION_RECORD *rec, CONTEXT *ctx, BOOL first )
  36 {
  37     if (!first)
  38     {
  39         DPRINTF( "stopping process due to unhandled exception %08lx.\n",
  40                  rec->ExceptionCode );
  41         raise( SIGSTOP );
  42     }
  43     return 0;  /* not handled */
  44 }
  45 static DEBUGHOOK debug_hook = default_hook;
  46
  47 /*******************************************************************
  48  *         EXC_SetDebugEventHook
  49  *         EXC_GetDebugEventHook
  50  *
  51  * Set/Get the hook for the built-in debugger.
  52  *
  53  * FIXME: the built-in debugger should use the normal debug events.
  54  */
  55 void EXC_SetDebugEventHook( DEBUGHOOK hook )
  56 {
  57     debug_hook = hook;
  58 }
  59 DEBUGHOOK EXC_GetDebugEventHook(void)
  60 {
  61     return debug_hook;
  62 }
  63
  64 /*******************************************************************
  65  *         EXC_RaiseHandler
  66  *
  67  * Handler for exceptions happening inside a handler.
  68  */
  69 static DWORD CALLBACK EXC_RaiseHandler( EXCEPTION_RECORD *rec, EXCEPTION_FRAME *frame,
  70                                         CONTEXT *context, EXCEPTION_FRAME **dispatcher )
  71 {
  72     if (rec->ExceptionFlags & (EH_UNWINDING | EH_EXIT_UNWIND))
  73         return ExceptionContinueSearch;
  74     /* We shouldn't get here so we store faulty frame in dispatcher */
  75     *dispatcher = ((EXC_NESTED_FRAME*)frame)->prevFrame;
  76     return ExceptionNestedException;
  77 }
  78
  79
  80 /*******************************************************************
  81  *         EXC_UnwindHandler
  82  *
  83  * Handler for exceptions happening inside an unwind handler.
  84  */
  85 static DWORD CALLBACK EXC_UnwindHandler( EXCEPTION_RECORD *rec, EXCEPTION_FRAME *frame,
  86                                          CONTEXT *context, EXCEPTION_FRAME **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 ExceptionCollidedUnwind;
  93 }
  94
  95
  96 /*******************************************************************
  97  *         EXC_CallHandler
  98  *
  99  * Call an exception handler, setting up an exception frame to catch exceptions
 100  * happening during the handler execution.
 101  */
 102 static DWORD EXC_CallHandler( PEXCEPTION_HANDLER handler, PEXCEPTION_HANDLER nested_handler,
 103                               EXCEPTION_RECORD *record, EXCEPTION_FRAME *frame,
 104                               CONTEXT *context, EXCEPTION_FRAME **dispatcher )
 105 {
 106     EXC_NESTED_FRAME newframe;
 107     DWORD ret;
 108
 109     newframe.frame.Handler = nested_handler;
 110     newframe.prevFrame     = frame;
 111     EXC_push_frame( &newframe.frame );
 112     TRACE( "calling handler at %p code=%lx flags=%lx\n",
 113            handler, record->ExceptionCode, record->ExceptionFlags );
 114     ret = handler( record, frame, context, dispatcher );
 115     TRACE( "handler returned %lx\n", ret );
 116     EXC_pop_frame( &newframe.frame );
 117     return ret;
 118 }
 119
 120
 121 /*******************************************************************
 122  *         EXC_DefaultHandling
 123  *
 124  * Default handling for exceptions. Called when we didn't find a suitable handler.
 125  */
 126 static void EXC_DefaultHandling( EXCEPTION_RECORD *rec, CONTEXT *context )
 127 {
 128     if ((PROCESS_Current()->flags & PDB32_DEBUGGED) &&
 129         (DEBUG_SendExceptionEvent( rec, FALSE ) == DBG_CONTINUE))
 130         return;  /* continue execution */
 131
 132     if (debug_hook( rec, context, FALSE ) == DBG_CONTINUE)
 133         return;  /* continue execution */
 134
 135     if (rec->ExceptionFlags & EH_STACK_INVALID)
 136         ERR("Exception frame is not in stack limits => unable to dispatch exception.\n");
 137     else if (rec->ExceptionCode == EXCEPTION_NONCONTINUABLE_EXCEPTION)
 138         ERR("Process attempted to continue execution after noncontinuable exception.\n");
 139     else
 140         ERR("Unhandled exception code %lx flags %lx addr %p\n",
 141             rec->ExceptionCode, rec->ExceptionFlags, rec->ExceptionAddress );
 142     TerminateProcess( GetCurrentProcess(), 1 );
 143 }
 144
 145
 146 /***********************************************************************
 147  *            RtlRaiseException  (NTDLL.464)
 148  */
 149 void WINAPI REGS_FUNC(RtlRaiseException)( EXCEPTION_RECORD *rec, CONTEXT *context )
 150 {
 151     PEXCEPTION_FRAME frame, dispatch, nested_frame;
 152     EXCEPTION_RECORD newrec;
 153     DWORD res;
 154
 155     TRACE( "code=%lx flags=%lx\n", rec->ExceptionCode, rec->ExceptionFlags );
 156
 157     if ((PROCESS_Current()->flags & PDB32_DEBUGGED) &&
 158         (DEBUG_SendExceptionEvent( rec, TRUE ) == DBG_CONTINUE))
 159         return;  /* continue execution */
 160
 161     if (debug_hook( rec, context, TRUE ) == DBG_CONTINUE)
 162         return;  /* continue execution */
 163
 164     frame = NtCurrentTeb()->except;
 165     nested_frame = NULL;
 166     while (frame != (PEXCEPTION_FRAME)0xFFFFFFFF)
 167     {
 168         /* Check frame address */
 169         if (((void*)frame < NtCurrentTeb()->stack_low) ||
 170             ((void*)(frame+1) > NtCurrentTeb()->stack_top) ||
 171             (int)frame & 3)
 172         {
 173             rec->ExceptionFlags |= EH_STACK_INVALID;
 174             break;
 175         }
 176
 177         /* Call handler */
 178         res = EXC_CallHandler( frame->Handler, EXC_RaiseHandler, rec, frame, context, &dispatch );
 179         if (frame == nested_frame)
 180         {
 181             /* no longer nested */
 182             nested_frame = NULL;
 183             rec->ExceptionFlags &= ~EH_NESTED_CALL;
 184         }
 185
 186         switch(res)
 187         {
 188         case ExceptionContinueExecution:
 189             if (!(rec->ExceptionFlags & EH_NONCONTINUABLE)) return;
 190             newrec.ExceptionCode    = STATUS_NONCONTINUABLE_EXCEPTION;
 191             newrec.ExceptionFlags   = EH_NONCONTINUABLE;
 192             newrec.ExceptionRecord  = rec;
 193             newrec.NumberParameters = 0;
 194             RtlRaiseException( &newrec );  /* never returns */
 195             break;
 196         case ExceptionContinueSearch:
 197             break;
 198         case ExceptionNestedException:
 199             if (nested_frame < dispatch) nested_frame = dispatch;
 200             rec->ExceptionFlags |= EH_NESTED_CALL;
 201             break;
 202         default:
 203             newrec.ExceptionCode    = STATUS_INVALID_DISPOSITION;
 204             newrec.ExceptionFlags   = EH_NONCONTINUABLE;
 205             newrec.ExceptionRecord  = rec;
 206             newrec.NumberParameters = 0;
 207             RtlRaiseException( &newrec );  /* never returns */
 208             break;
 209         }
 210         frame = frame->Prev;
 211     }
 212     EXC_DefaultHandling( rec, context );
 213 }
 214
 215
 216 /*******************************************************************
 217  *         RtlUnwind  (KERNEL32.590) (NTDLL.518)
 218  */
 219 void WINAPI REGS_FUNC(RtlUnwind)( PEXCEPTION_FRAME pEndFrame, LPVOID unusedEip,
 220                                   PEXCEPTION_RECORD pRecord, DWORD returnEax,
 221                                   CONTEXT *context )
 222 {
 223     EXCEPTION_RECORD record, newrec;
 224     PEXCEPTION_FRAME frame, dispatch;
 225
 226 #ifdef __i386__
 227     EAX_reg(context) = returnEax;
 228 #endif
 229
 230     /* build an exception record, if we do not have one */
 231     if (!pRecord)
 232     {
 233         record.ExceptionCode    = STATUS_UNWIND;
 234         record.ExceptionFlags   = 0;
 235         record.ExceptionRecord  = NULL;
 236         record.ExceptionAddress = GET_IP(context);
 237         record.NumberParameters = 0;
 238         pRecord = &record;
 239     }
 240
 241     pRecord->ExceptionFlags |= EH_UNWINDING | (pEndFrame ? 0 : EH_EXIT_UNWIND);
 242
 243     TRACE( "code=%lx flags=%lx\n", pRecord->ExceptionCode, pRecord->ExceptionFlags );
 244
 245     /* get chain of exception frames */
 246     frame = NtCurrentTeb()->except;
 247     while ((frame != (PEXCEPTION_FRAME)0xffffffff) && (frame != pEndFrame))
 248     {
 249         /* Check frame address */
 250         if (pEndFrame && (frame > pEndFrame))
 251         {
 252             newrec.ExceptionCode    = STATUS_INVALID_UNWIND_TARGET;
 253             newrec.ExceptionFlags   = EH_NONCONTINUABLE;
 254             newrec.ExceptionRecord  = pRecord;
 255             newrec.NumberParameters = 0;
 256             RtlRaiseException( &newrec );  /* never returns */
 257         }
 258         if (((void*)frame < NtCurrentTeb()->stack_low) ||
 259             ((void*)(frame+1) > NtCurrentTeb()->stack_top) ||
 260             (int)frame & 3)
 261         {
 262             newrec.ExceptionCode    = STATUS_BAD_STACK;
 263             newrec.ExceptionFlags   = EH_NONCONTINUABLE;
 264             newrec.ExceptionRecord  = pRecord;
 265             newrec.NumberParameters = 0;
 266             RtlRaiseException( &newrec );  /* never returns */
 267         }
 268
 269         /* Call handler */
 270         switch(EXC_CallHandler( frame->Handler, EXC_UnwindHandler, pRecord,
 271                                 frame, context, &dispatch ))
 272         {
 273         case ExceptionContinueSearch:
 274             break;
 275         case ExceptionCollidedUnwind:
 276             frame = dispatch;
 277             break;
 278         default:
 279             newrec.ExceptionCode    = STATUS_INVALID_DISPOSITION;
 280             newrec.ExceptionFlags   = EH_NONCONTINUABLE;
 281             newrec.ExceptionRecord  = pRecord;
 282             newrec.NumberParameters = 0;
 283             RtlRaiseException( &newrec );  /* never returns */
 284             break;
 285         }
 286         frame = EXC_pop_frame( frame );
 287     }
 288 }
 289
 290
 291 /*******************************************************************
 292  *         NtRaiseException    (NTDLL.175)
 293  *
 294  * Real prototype:
 295  *    DWORD WINAPI NtRaiseException( EXCEPTION_RECORD *rec, CONTEXT *ctx, BOOL first );
 296  */
 297 void WINAPI REGS_FUNC(NtRaiseException)( EXCEPTION_RECORD *rec, CONTEXT *ctx,
 298                                          BOOL first, CONTEXT *context )
 299 {
 300     REGS_FUNC(RtlRaiseException)( rec, ctx );
 301     *context = *ctx;
 302 }
 303
 304
 305 /***********************************************************************
 306  *            RtlRaiseStatus  (NTDLL.465)
 307  *
 308  * Raise an exception with ExceptionCode = status
 309  */
 310 void WINAPI RtlRaiseStatus( NTSTATUS status )
 311 {
 312     EXCEPTION_RECORD ExceptionRec;
 313
 314     ExceptionRec.ExceptionCode    = status;
 315     ExceptionRec.ExceptionFlags   = EH_NONCONTINUABLE;
 316     ExceptionRec.ExceptionRecord  = NULL;
 317     ExceptionRec.NumberParameters = 0;
 318     RtlRaiseException( &ExceptionRec );
 319 }
 320
 321
 322 /***********************************************************************
 323  *           DebugBreak   (KERNEL32.181)
 324  */
 325 void WINAPI REGS_FUNC(DebugBreak)( CONTEXT *context )
 326 {
 327     EXCEPTION_RECORD rec;
 328
 329     rec.ExceptionCode    = EXCEPTION_BREAKPOINT;
 330     rec.ExceptionFlags   = EH_NONCONTINUABLE;
 331     rec.ExceptionRecord  = NULL;
 332     rec.NumberParameters = 0;
 333     REGS_FUNC(RtlRaiseException)( &rec, context );
 334 }
 335
 336
 337 /***********************************************************************
 338  *           DebugBreak16   (KERNEL.203)
 339  */
 340 void WINAPI DebugBreak16( CONTEXT86 *context )
 341 {
 342 #ifdef __i386__
 343     REGS_FUNC(DebugBreak)( context );
 344 #endif  /* defined(__i386__) */
 345 }
 346
 347
 348 /***********************************************************************
 349  *           EXC_SaveContext
 350  *
 351  * Set the register values from a sigcontext.
 352  */
 353 static void EXC_SaveContext( CONTEXT *context, const SIGCONTEXT *sigcontext )
 354 {
 355 #ifdef __i386__
 356     EAX_reg(context) = EAX_sig(sigcontext);
 357     EBX_reg(context) = EBX_sig(sigcontext);
 358     ECX_reg(context) = ECX_sig(sigcontext);
 359     EDX_reg(context) = EDX_sig(sigcontext);
 360     ESI_reg(context) = ESI_sig(sigcontext);
 361     EDI_reg(context) = EDI_sig(sigcontext);
 362     EBP_reg(context) = EBP_sig(sigcontext);
 363     EFL_reg(context) = EFL_sig(sigcontext);
 364     EIP_reg(context) = EIP_sig(sigcontext);
 365     ESP_reg(context) = ESP_sig(sigcontext);
 366     CS_reg(context)  = LOWORD(CS_sig(sigcontext));
 367     DS_reg(context)  = LOWORD(DS_sig(sigcontext));
 368     ES_reg(context)  = LOWORD(ES_sig(sigcontext));
 369     SS_reg(context)  = LOWORD(SS_sig(sigcontext));
 370 #ifdef FS_sig
 371     FS_reg(context)  = LOWORD(FS_sig(sigcontext));
 372 #else
 373     GET_FS( FS_reg(context) );
 374     FS_reg(context) &= 0xffff;
 375 #endif
 376 #ifdef GS_sig
 377     GS_reg(context)  = LOWORD(GS_sig(sigcontext));
 378 #else
 379     GET_GS( GS_reg(context) );
 380     GS_reg(context) &= 0xffff;
 381 #endif
 382     if (ISV86(context)) V86BASE(context) = (DWORD)DOSMEM_MemoryBase(0);
 383 #endif  /* __i386__ */
 384 }
 385
 386
 387 /***********************************************************************
 388  *           EXC_RestoreContext
 389  *
 390  * Build a sigcontext from the register values.
 391  */
 392 static void EXC_RestoreContext( const CONTEXT *context, SIGCONTEXT *sigcontext )
 393 {
 394 #ifdef __i386__
 395     EAX_sig(sigcontext) = EAX_reg(context);
 396     EBX_sig(sigcontext) = EBX_reg(context);
 397     ECX_sig(sigcontext) = ECX_reg(context);
 398     EDX_sig(sigcontext) = EDX_reg(context);
 399     ESI_sig(sigcontext) = ESI_reg(context);
 400     EDI_sig(sigcontext) = EDI_reg(context);
 401     EBP_sig(sigcontext) = EBP_reg(context);
 402     EFL_sig(sigcontext) = EFL_reg(context);
 403     EIP_sig(sigcontext) = EIP_reg(context);
 404     ESP_sig(sigcontext) = ESP_reg(context);
 405     CS_sig(sigcontext)  = CS_reg(context);
 406     DS_sig(sigcontext)  = DS_reg(context);
 407     ES_sig(sigcontext)  = ES_reg(context);
 408     SS_sig(sigcontext)  = SS_reg(context);
 409 #ifdef FS_sig
 410     FS_sig(sigcontext)  = FS_reg(context);
 411 #else
 412     SET_FS( FS_reg(context) );
 413 #endif
 414 #ifdef GS_sig
 415     GS_sig(sigcontext)  = GS_reg(context);
 416 #else
 417     SET_GS( GS_reg(context) );
 418 #endif
 419 #endif  /* __i386__ */
 420 }
 421
 422
 423 /**********************************************************************
 424  *              EXC_segv
 425  *
 426  * Handler for SIGSEGV and related errors.
 427  */
 428 static HANDLER_DEF(EXC_segv)
 429 {
 430     EXCEPTION_RECORD rec;
 431     CONTEXT context;
 432
 433     HANDLER_INIT();
 434
 435 #if defined(TRAP_sig) && defined(CR2_sig)
 436     /* we want the page-fault case to be fast */
 437     if (TRAP_sig(HANDLER_CONTEXT) == 14)
 438         if (VIRTUAL_HandleFault( (LPVOID)CR2_sig(HANDLER_CONTEXT) )) return;
 439 #endif
 440
 441     EXC_SaveContext( &context, HANDLER_CONTEXT );
 442     rec.ExceptionRecord  = NULL;
 443     rec.ExceptionFlags   = EH_NONCONTINUABLE;
 444     rec.ExceptionAddress = GET_IP(&context);
 445     rec.NumberParameters = 0;
 446
 447 #ifdef TRAP_sig
 448     switch(TRAP_sig(HANDLER_CONTEXT))
 449     {
 450     case 4:   /* Overflow exception */
 451         rec.ExceptionCode = EXCEPTION_INT_OVERFLOW;
 452         break;
 453     case 5:   /* Bound range exception */
 454         rec.ExceptionCode = EXCEPTION_ARRAY_BOUNDS_EXCEEDED;
 455         break;
 456     case 6:   /* Invalid opcode exception */
 457         rec.ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION;
 458         break;
 459     case 12:  /* Stack fault */
 460         rec.ExceptionCode = EXCEPTION_STACK_OVERFLOW;
 461         break;
 462     case 11:  /* Segment not present exception */
 463     case 13:  /* General protection fault */
 464         if (INSTR_EmulateInstruction( &context )) goto restore;
 465         rec.ExceptionCode = EXCEPTION_PRIV_INSTRUCTION;
 466         break;
 467     case 14:  /* Page fault */
 468 #ifdef CR2_sig
 469         rec.NumberParameters = 2;
 470 #ifdef ERROR_sig
 471         rec.ExceptionInformation[0] = (ERROR_sig(HANDLER_CONTEXT) & 2) != 0;
 472 #else
 473         rec.ExceptionInformation[0] = 0;
 474 #endif /* ERROR_sig */
 475         rec.ExceptionInformation[1] = CR2_sig(HANDLER_CONTEXT);
 476 #endif /* CR2_sig */
 477         rec.ExceptionCode = EXCEPTION_ACCESS_VIOLATION;
 478         break;
 479     case 17:  /* Alignment check exception */
 480         /* FIXME: pass through exception handler first? */
 481         if (EFL_reg(&context) & 0x00040000)
 482         {
 483             /* Disable AC flag, return */
 484             EFL_reg(&context) &= ~0x00040000;
 485             goto restore;
 486         }
 487         rec.ExceptionCode = EXCEPTION_DATATYPE_MISALIGNMENT;
 488         break;
 489     default:
 490         ERR( "Got unexpected trap %ld\n", TRAP_sig(HANDLER_CONTEXT) );
 491         /* fall through */
 492     case 2:   /* NMI interrupt */
 493     case 7:   /* Device not available exception */
 494     case 8:   /* Double fault exception */
 495     case 10:  /* Invalid TSS exception */
 496     case 15:  /* Unknown exception */
 497     case 18:  /* Machine check exception */
 498     case 19:  /* Cache flush exception */
 499         rec.ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION;
 500         break;
 501     }
 502 #else  /* TRAP_sig */
 503 # ifdef __i386__
 504     if (INSTR_EmulateInstruction( &context )) goto restore;
 505 # endif
 506     rec.ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION;  /* generic error */
 507 #endif  /* TRAP_sig */
 508
 509     REGS_FUNC(RtlRaiseException)( &rec, &context );
 510  restore:
 511     EXC_RestoreContext( &context, HANDLER_CONTEXT );
 512 }
 513
 514
 515 /**********************************************************************
 516  *              EXC_trap
 517  *
 518  * Handler for SIGTRAP.
 519  */
 520 static HANDLER_DEF(EXC_trap)
 521 {
 522     EXCEPTION_RECORD rec;
 523     CONTEXT context;
 524
 525     HANDLER_INIT();
 526
 527 #ifdef TRAP_sig
 528     rec.ExceptionCode = (TRAP_sig(HANDLER_CONTEXT) == 1) ?
 529                             EXCEPTION_SINGLE_STEP : EXCEPTION_BREAKPOINT;
 530 #else
 531     rec.ExceptionCode = EXCEPTION_BREAKPOINT;
 532 #endif  /* TRAP_sig */
 533
 534     EXC_SaveContext( &context, HANDLER_CONTEXT );
 535     rec.ExceptionFlags   = EXCEPTION_CONTINUABLE;
 536     rec.ExceptionRecord  = NULL;
 537     rec.ExceptionAddress = GET_IP(&context);
 538     rec.NumberParameters = 0;
 539     REGS_FUNC(RtlRaiseException)( &rec, &context );
 540     EXC_RestoreContext( &context, HANDLER_CONTEXT );
 541 }
 542
 543
 544 /***********************************************************************
 545  *           EXC_SaveFPU
 546  *
 547  * Set the FPU context from a sigcontext.
 548  */
 549 static void inline EXC_SaveFPU( CONTEXT *context, const SIGCONTEXT *sigcontext )
 550 {
 551 #ifdef __i386__
 552 # ifdef FPU_sig
 553     if (FPU_sig(sigcontext))
 554     {
 555         context->FloatSave = *FPU_sig(sigcontext);
 556         return;
 557     }
 558 # endif  /* FPU_sig */
 559 # ifdef __GNUC__
 560     __asm__ __volatile__( "fnsave %0; fwait" : "=m" (context->FloatSave) );
 561 # endif  /* __GNUC__ */
 562 #endif  /* __i386__ */
 563 }
 564
 565
 566 /***********************************************************************
 567  *           EXC_RestoreFPU
 568  *
 569  * Restore the FPU context to a sigcontext.
 570  */
 571 static void inline EXC_RestoreFPU( CONTEXT *context, const SIGCONTEXT *sigcontext )
 572 {
 573 #ifdef __i386__
 574 # ifdef FPU_sig
 575     if (FPU_sig(sigcontext))
 576     {
 577         *FPU_sig(sigcontext) = context->FloatSave;
 578         return;
 579     }
 580 # endif  /* FPU_sig */
 581 # ifdef __GNUC__
 582     /* avoid nested exceptions */
 583     context->FloatSave.StatusWord &= context->FloatSave.ControlWord | 0xffffff80;
 584     __asm__ __volatile__( "frstor %0; fwait" : : "m" (context->FloatSave) );
 585 # endif  /* __GNUC__ */
 586 #endif  /* __i386__ */
 587 }
 588
 589
 590 /**********************************************************************
 591  *              EXC_GetFPUCode
 592  *
 593  * Get the FPU exception code from the FPU status.
 594  */
 595 static inline DWORD EXC_GetFPUCode( const CONTEXT *context )
 596 {
 597 #ifdef __i386__
 598     DWORD status = context->FloatSave.StatusWord;
 599
 600     if (status & 0x01)  /* IE */
 601     {
 602         if (status & 0x40)  /* SF */
 603             return EXCEPTION_FLT_STACK_CHECK;
 604         else
 605             return EXCEPTION_FLT_INVALID_OPERATION;
 606     }
 607     if (status & 0x02) return EXCEPTION_FLT_DENORMAL_OPERAND;  /* DE flag */
 608     if (status & 0x04) return EXCEPTION_FLT_DIVIDE_BY_ZERO;    /* ZE flag */
 609     if (status & 0x08) return EXCEPTION_FLT_OVERFLOW;          /* OE flag */
 610     if (status & 0x10) return EXCEPTION_FLT_UNDERFLOW;         /* UE flag */
 611     if (status & 0x20) return EXCEPTION_FLT_INEXACT_RESULT;    /* PE flag */
 612 #endif  /* __i386__ */
 613     return EXCEPTION_FLT_INVALID_OPERATION;  /* generic error */
 614 }
 615
 616
 617 /**********************************************************************
 618  *              EXC_fpe
 619  *
 620  * Handler for SIGFPE.
 621  */
 622 static HANDLER_DEF(EXC_fpe)
 623 {
 624     EXCEPTION_RECORD rec;
 625     CONTEXT context;
 626
 627     HANDLER_INIT();
 628
 629     EXC_SaveFPU( &context, HANDLER_CONTEXT );
 630
 631 #ifdef TRAP_sig
 632     switch(TRAP_sig(HANDLER_CONTEXT))
 633     {
 634     case 0:   /* Division by zero exception */
 635         rec.ExceptionCode = EXCEPTION_INT_DIVIDE_BY_ZERO;
 636         break;
 637     case 9:   /* Coprocessor segment overrun */
 638         rec.ExceptionCode = EXCEPTION_FLT_INVALID_OPERATION;
 639         break;
 640     case 16:  /* Floating point exception */
 641         rec.ExceptionCode = EXC_GetFPUCode( &context );
 642         break;
 643     default:
 644         ERR( "Got unexpected trap %ld\n", TRAP_sig(HANDLER_CONTEXT) );
 645         rec.ExceptionCode = EXCEPTION_FLT_INVALID_OPERATION;
 646         break;
 647     }
 648 #else  /* TRAP_sig */
 649     rec.ExceptionCode = EXC_GetFPUCode( &context );
 650 #endif  /* TRAP_sig */
 651
 652     EXC_SaveContext( &context, HANDLER_CONTEXT );
 653     rec.ExceptionFlags   = EH_NONCONTINUABLE;
 654     rec.ExceptionRecord  = NULL;
 655     rec.ExceptionAddress = GET_IP(&context);
 656     rec.NumberParameters = 0;
 657     REGS_FUNC(RtlRaiseException)( &rec, &context );
 658     EXC_RestoreContext( &context, HANDLER_CONTEXT );
 659     EXC_RestoreFPU( &context, HANDLER_CONTEXT );
 660 }
 661
 662
 663 /**********************************************************************
 664  *              EXC_int
 665  *
 666  * Handler for SIGINT.
 667  */
 668 static HANDLER_DEF(EXC_int)
 669 {
 670     EXCEPTION_RECORD rec;
 671     CONTEXT context;
 672
 673     HANDLER_INIT();
 674
 675     EXC_SaveContext( &context, HANDLER_CONTEXT );
 676     rec.ExceptionCode    = CONTROL_C_EXIT;
 677     rec.ExceptionFlags   = EH_NONCONTINUABLE;
 678     rec.ExceptionRecord  = NULL;
 679     rec.ExceptionAddress = GET_IP(&context);
 680     rec.NumberParameters = 0;
 681     REGS_FUNC(RtlRaiseException)( &rec, &context );
 682     EXC_RestoreContext( &context, HANDLER_CONTEXT );
 683 }
 684
 685
 686 /**********************************************************************
 687  *          EXC_InitHandlers
 688  *
 689  * Initialize the signal handlers for exception handling.
 690  */
 691 void EXC_InitHandlers(void)
 692 {
 693     SIGNAL_SetHandler( SIGINT,  (void (*)())EXC_int );
 694     SIGNAL_SetHandler( SIGFPE,  (void (*)())EXC_fpe );
 695     SIGNAL_SetHandler( SIGSEGV, (void (*)())EXC_segv );
 696     SIGNAL_SetHandler( SIGILL,  (void (*)())EXC_segv );
 697 #ifdef SIGBUS
 698     SIGNAL_SetHandler( SIGBUS,  (void (*)())EXC_segv );
 699 #endif
 700 #ifdef SIGTRAP
 701     SIGNAL_SetHandler( SIGTRAP, (void (*)())EXC_trap );
 702 #endif
 703     return;
 704 }