reactos/ntoskrnl/ke/catch.c

   1 /*
   2  *  ReactOS kernel
   3  *  Copyright (C) 2000  ReactOS Team
   4  *
   5  *  This program is free software; you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License as published by
   7  *  the Free Software Foundation; either version 2 of the License, or
   8  *  (at your option) any later version.
   9  *
  10  *  This program is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with this program; if not, write to the Free Software
  17  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  18  */
  19 /* $Id: catch.c,v 1.31 2003/04/24 16:55:08 hbirr Exp $
  20  *
  21  * PROJECT:              ReactOS kernel
  22  * FILE:                 ntoskrnl/ke/catch.c
  23  * PURPOSE:              Exception handling
  24  * PROGRAMMER:           David Welch (welch@mcmail.com)
  25  *                       Casper S. Hornstrup (chorns@users.sourceforge.net)
  26  */
  27
  28 /* INCLUDES *****************************************************************/
  29
  30 #include <ddk/ntddk.h>
  31 #include <reactos/bugcodes.h>
  32 #include <roscfg.h>
  33 #include <internal/ke.h>
  34 #include <internal/ldr.h>
  35 #include <internal/ps.h>
  36 #include <internal/kd.h>
  37
  38 #define NDEBUG
  39 #include <internal/debug.h>
  40
  41 /* FUNCTIONS ****************************************************************/
  42
  43 ULONG
  44 RtlpDispatchException(IN PEXCEPTION_RECORD  ExceptionRecord,
  45         IN PCONTEXT  Context);
  46
  47 VOID
  48 KiDispatchException(PEXCEPTION_RECORD ExceptionRecord,
  49                     PCONTEXT Context,
  50                     PKTRAP_FRAME Tf,
  51                     KPROCESSOR_MODE PreviousMode,
  52                     BOOLEAN SearchFrames)
  53 {
  54   EXCEPTION_DISPOSITION Value;
  55   CONTEXT TContext;
  56   KD_CONTINUE_TYPE Action = kdContinue;
  57
  58   DPRINT("KiDispatchException() called\n");
  59
  60   /* PCR->KeExceptionDispatchCount++; */
  61
  62   if (Context == NULL)
  63     {
  64       TContext.ContextFlags = CONTEXT_FULL;
  65       if (PreviousMode == UserMode)
  66         {
  67           TContext.ContextFlags = TContext.ContextFlags | CONTEXT_DEBUGGER;
  68         }
  69
  70       KeTrapFrameToContext(Tf, &TContext);
  71
  72       Context = &TContext;
  73     }
  74
  75 #if 0
  76   if (ExceptionRecord->ExceptionCode == STATUS_BREAKPOINT)
  77     {
  78       Context->Eip--;
  79     }
  80 #endif
  81
  82   if (KdDebuggerEnabled && KdDebugState & KD_DEBUG_GDB)
  83     {
  84       Action = KdEnterDebuggerException (ExceptionRecord, Context, Tf);
  85     }
  86 #ifdef KDBG
  87   else if (KdDebuggerEnabled && KdDebugState & KD_DEBUG_KDB)
  88     {
  89       Action = KdbEnterDebuggerException (ExceptionRecord, Context, Tf);
  90     }
  91 #endif /* KDBG */
  92   if (Action != kdHandleException)
  93     {
  94       if (PreviousMode == UserMode)
  95         {
  96           if (SearchFrames)
  97             {
  98               PULONG Stack;
  99               ULONG CDest;
 100
 101               /* FIXME: Forward exception to user mode debugger */
 102
 103               /* FIXME: Check user mode stack for enough space */
 104
 105               /*
 106                * Let usermode try and handle the exception
 107                */
 108               Tf->Esp = Tf->Esp -
 109                 (12 + sizeof(EXCEPTION_RECORD) + sizeof(CONTEXT));
 110               Stack = (PULONG)Tf->Esp;
 111               CDest = 3 + (ROUND_UP(sizeof(EXCEPTION_RECORD), 4) / 4);
 112               /* Return address */
 113               Stack[0] = 0;
 114               /* Pointer to EXCEPTION_RECORD structure */
 115               Stack[1] = (ULONG)&Stack[3];
 116               /* Pointer to CONTEXT structure */
 117               Stack[2] = (ULONG)&Stack[CDest];
 118               memcpy(&Stack[3], ExceptionRecord, sizeof(EXCEPTION_RECORD));
 119               memcpy(&Stack[CDest], Context, sizeof(CONTEXT));
 120
 121               Tf->Eip = (ULONG)LdrpGetSystemDllExceptionDispatcher();
 122               return;
 123             }
 124
 125           /* FIXME: Forward the exception to the debugger */
 126
 127           /* FIXME: Forward the exception to the process exception port */
 128
 129           /* Terminate the offending thread */
 130           DPRINT1("Unhandled UserMode exception, terminating thread\n");
 131           ZwTerminateThread(NtCurrentThread(), ExceptionRecord->ExceptionCode);
 132
 133           /* If that fails then bugcheck */
 134           DPRINT1("Could not terminate thread\n");
 135           KeBugCheck(KMODE_EXCEPTION_NOT_HANDLED);
 136         }
 137       else
 138         {
 139           /* PreviousMode == KernelMode */
 140           Value = RtlpDispatchException (ExceptionRecord, Context);
 141
 142           DPRINT("RtlpDispatchException() returned with 0x%X\n", Value);
 143           /*
 144            * If RtlpDispatchException() does not handle the exception then
 145            * bugcheck
 146            */
 147           if (Value != ExceptionContinueExecution ||
 148               0 != (ExceptionRecord->ExceptionFlags & EXCEPTION_NONCONTINUABLE))
 149             {
 150               KeBugCheckWithTf(KMODE_EXCEPTION_NOT_HANDLED, 0, 0, 0, 0, Tf);
 151             }
 152         }
 153     }
 154   else
 155     {
 156       KeContextToTrapFrame (Context, KeGetCurrentThread()->TrapFrame);
 157     }
 158 }
 159
 160 VOID STDCALL
 161 ExRaiseAccessViolation (VOID)
 162 {
 163   ExRaiseStatus (STATUS_ACCESS_VIOLATION);
 164 }
 165
 166 VOID STDCALL
 167 ExRaiseDatatypeMisalignment (VOID)
 168 {
 169   ExRaiseStatus (STATUS_DATATYPE_MISALIGNMENT);
 170 }
 171
 172 VOID STDCALL
 173 ExRaiseStatus (IN NTSTATUS Status)
 174 {
 175   EXCEPTION_RECORD ExceptionRecord;
 176
 177   DPRINT("ExRaiseStatus(%x)\n", Status);
 178
 179   ExceptionRecord.ExceptionRecord = NULL;
 180   ExceptionRecord.NumberParameters = 0;
 181   ExceptionRecord.ExceptionCode = Status;
 182   ExceptionRecord.ExceptionFlags = 0;
 183
 184   RtlRaiseException(&ExceptionRecord);
 185 }
 186
 187
 188 NTSTATUS STDCALL
 189 NtRaiseException (IN PEXCEPTION_RECORD ExceptionRecord,
 190                   IN PCONTEXT Context,
 191                   IN BOOLEAN SearchFrames)
 192 {
 193   KiDispatchException(ExceptionRecord,
 194                       Context,
 195                       PsGetCurrentThread()->Tcb.TrapFrame,
 196                       ExGetPreviousMode(),
 197                       SearchFrames);
 198   return(STATUS_SUCCESS);
 199 }
 200
 201
 202 VOID STDCALL
 203 RtlRaiseException(PEXCEPTION_RECORD ExceptionRecord)
 204 {
 205   ZwRaiseException(ExceptionRecord, NULL, TRUE);
 206 }
 207
 208 /* EOF */