dll/ntdll/dispatch/dispatch.c

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