reactos/dll/ntdll/main/dispatch.c

   1 /* COPYRIGHT:       See COPYING in the top level directory
   2  * PROJECT:         ReactOS NT Library
   3  * FILE:            lib/ntdll/main/dispatch.c
   4  * PURPOSE:         User-Mode NT Dispatchers
   5  * PROGRAMERS:      Alex Ionescu (alex@relsoft.net)
   6  *                  David Welch <welch@cwcom.net>
   7  */
   8
   9 /* INCLUDES *****************************************************************/
  10
  11 #include <ntdll.h>
  12 #define NDEBUG
  13 #include <debug.h>
  14
  15 typedef NTSTATUS (NTAPI *USER_CALL)(PVOID Argument, ULONG ArgumentLength);
  16
  17 EXCEPTION_DISPOSITION NTAPI
  18 RtlpExecuteVectoredExceptionHandlers(IN PEXCEPTION_RECORD  ExceptionRecord,
  19                                      IN PCONTEXT  Context);
  20
  21 /* FUNCTIONS ****************************************************************/
  22
  23 /*
  24  * @implemented
  25  */
  26 VOID
  27 NTAPI
  28 KiUserExceptionDispatcher(PEXCEPTION_RECORD ExceptionRecord,
  29                           PCONTEXT Context)
  30 {
  31     EXCEPTION_RECORD NestedExceptionRecord;
  32     NTSTATUS Status;
  33
  34     /* call the vectored exception handlers */
  35     if(RtlpExecuteVectoredExceptionHandlers(ExceptionRecord,
  36                                             Context) != ExceptionContinueExecution)
  37     {
  38         goto ContinueExecution;
  39     }
  40     else
  41     {
  42         /* Dispatch the exception and check the result */
  43         if(RtlDispatchException(ExceptionRecord, Context))
  44         {
  45 ContinueExecution:
  46             /* Continue executing */
  47             Status = NtContinue(Context, FALSE);
  48         }
  49         else
  50         {
  51             /* Raise an exception */
  52             Status = NtRaiseException(ExceptionRecord, Context, FALSE);
  53         }
  54     }
  55
  56     /* Setup the Exception record */
  57     NestedExceptionRecord.ExceptionCode = Status;
  58     NestedExceptionRecord.ExceptionFlags = EXCEPTION_NONCONTINUABLE;
  59     NestedExceptionRecord.ExceptionRecord = ExceptionRecord;
  60     NestedExceptionRecord.NumberParameters = Status;
  61
  62     /* Raise the exception */
  63     RtlRaiseException(&NestedExceptionRecord);
  64 }
  65
  66 /*
  67  * @implemented
  68  */
  69 VOID
  70 NTAPI
  71 KiRaiseUserExceptionDispatcher(VOID)
  72 {
  73     EXCEPTION_RECORD ExceptionRecord;
  74
  75     /* Setup the exception record */
  76     ExceptionRecord.ExceptionCode = ((PTEB)NtCurrentTeb())->ExceptionCode;
  77     ExceptionRecord.ExceptionFlags = 0;
  78     ExceptionRecord.ExceptionRecord = NULL;
  79     ExceptionRecord.NumberParameters = 0;
  80
  81     /* Raise the exception */
  82     RtlRaiseException(&ExceptionRecord);
  83 }
  84
  85 /*
  86  * @implemented
  87  */
  88 VOID
  89 NTAPI
  90 KiUserCallbackDispatcher(ULONG Index,
  91                          PVOID Argument,
  92                          ULONG ArgumentLength)
  93 {
  94     /* Return with the result of the callback function */
  95     ZwCallbackReturn(NULL,
  96                      0,
  97                      ((USER_CALL)(NtCurrentPeb()->KernelCallbackTable[Index]))
  98                      (Argument, ArgumentLength));
  99 }