Intravision/reactos
1
0
Fork 0
mirror of https://github.com/reactos/reactos.git synced 2025-08-05 15:43:00 +00:00
Code Issues Projects Releases Packages Wiki Activity
reactos/reactos/ntoskrnl/rtl/i386/exception.c
guido 6756a59755 initialize variable 
svn path=/trunk/; revision=4503
2003-04-05 22:21:33 +00:00

476 lines
13 KiB
C
Executable file
Raw Blame History

/* $Id: exception.c,v 1.5 2003/04/05 22:20:49 guido Exp $
*
* COPYRIGHT: See COPYING in the top level directory
* PROJECT: ReactOS kernel
* PURPOSE: Kernel-mode exception support for IA-32
* FILE: ntoskrnl/rtl/i386/exception.c
* PROGRAMER: Casper S. Hornstrup (chorns@users.sourceforge.net)
*/
/* INCLUDES *****************************************************************/
#include <ntos.h>
#include <internal/ke.h>
#include <internal/ps.h>
#define NDEBUG
#include <debug.h>
/* FUNCTIONS ***************************************************************/
#if 1
VOID STDCALL
MsvcrtDebug(ULONG Value)
{
DbgPrint("KernelDebug 0x%.08x\n", Value);
}
#endif
int
_abnormal_termination(void)
{
DbgPrint("Abnormal Termination\n");
return 0;
}
struct _CONTEXT;
EXCEPTION_DISPOSITION
_except_handler2(
struct _EXCEPTION_RECORD *ExceptionRecord,
void *RegistrationFrame,
struct _CONTEXT *ContextRecord,
void *DispatcherContext)
{
DbgPrint("_except_handler2()\n");
return (EXCEPTION_DISPOSITION)0;
}
void __cdecl
_global_unwind2(PEXCEPTION_REGISTRATION RegistrationFrame)
{
RtlUnwind(RegistrationFrame, &&__ret_label, NULL, 0);
__ret_label:
// return is important
return;
}
/* Implemented in except.s */
VOID
RtlpCaptureContext(PCONTEXT pContext);
/* Macros that will help streamline the SEH implementations for
kernel mode and user mode */
#define SehpGetStackLimits(StackBase, StackLimit) \
{ \
(*(StackBase)) = KeGetCurrentKPCR()->StackBase; \
(*(StackLimit)) = KeGetCurrentKPCR()->StackLimit; \
}
#define SehpGetExceptionList() \
(PEXCEPTION_REGISTRATION)(KeGetCurrentThread()->TrapFrame ->ExceptionList)
#define SehpSetExceptionList(NewExceptionList) \
KeGetCurrentThread()->TrapFrame->ExceptionList = (PVOID)(NewExceptionList)
#define SehpCaptureContext(Context) \
{ \
KeTrapFrameToContext(KeGetCurrentThread()->TrapFrame, (Context)); \
}
/*** Code below this line is shared with lib/ntdll/arch/ia32/exception.c - please keep in sync ***/
VOID STDCALL
AsmDebug(ULONG Value)
{
DbgPrint("Value 0x%.08x\n", Value);
}
/* Declare a few prototypes for the functions in except.s */
EXCEPTION_DISPOSITION
RtlpExecuteHandlerForException(
PEXCEPTION_RECORD ExceptionRecord,
PEXCEPTION_REGISTRATION RegistrationFrame,
PCONTEXT Context,
PVOID DispatcherContext,
PEXCEPTION_HANDLER ExceptionHandler);
EXCEPTION_DISPOSITION
RtlpExecuteHandlerForUnwind(
PEXCEPTION_RECORD ExceptionRecord,
PEXCEPTION_REGISTRATION RegistrationFrame,
PCONTEXT Context,
PVOID DispatcherContext,
PEXCEPTION_HANDLER ExceptionHandler);
#ifndef NDEBUG
VOID RtlpDumpExceptionRegistrations(VOID)
{
PEXCEPTION_REGISTRATION Current;
DbgPrint("Dumping exception registrations:\n");
Current = SehpGetExceptionList();
if ((ULONG_PTR)Current != -1)
{
while ((ULONG_PTR)Current != -1)
{
DbgPrint(" (0x%08X) HANDLER (0x%08X)\n", Current, Current->handler);
Current = Current->prev;
}
DbgPrint(" End-Of-List\n");
} else {
DbgPrint(" No exception registrations exists.\n");
}
}
#endif /* NDEBUG */
ULONG
RtlpDispatchException(IN PEXCEPTION_RECORD ExceptionRecord,
IN PCONTEXT Context)
{
PEXCEPTION_REGISTRATION RegistrationFrame;
DWORD DispatcherContext;
DWORD ReturnValue;
DPRINT("RtlpDispatchException()\n");
#ifndef NDEBUG
RtlpDumpExceptionRegistrations();
#endif /* NDEBUG */
RegistrationFrame = SehpGetExceptionList();
DPRINT("RegistrationFrame is 0x%X\n", RegistrationFrame);
while ((ULONG_PTR)RegistrationFrame != (ULONG_PTR)-1)
{
EXCEPTION_RECORD ExceptionRecord2;
DWORD Temp = 0;
//PVOID RegistrationFrameEnd = (PVOID)RegistrationFrame + 8;
// Make sure the registration frame is located within the stack
DPRINT("Error checking\n");
#if 0
if (Teb->Tib.StackBase > RegistrationFrameEnd)
{
DPRINT("Teb->Tib.StackBase (0x%.08x) > RegistrationFrameEnd (0x%.08x)\n",
Teb->Tib.StackBase, RegistrationFrameEnd);
ExceptionRecord->ExceptionFlags |= EXCEPTION_STACK_INVALID;
return ExceptionContinueExecution;
}
// FIXME: Stack top, correct?
if (Teb->Tib.StackLimit < RegistrationFrameEnd)
{
DPRINT("Teb->Tib.StackLimit (0x%.08x) > RegistrationFrameEnd (0x%.08x)\n",
Teb->Tib.StackLimit, RegistrationFrameEnd);
ExceptionRecord->ExceptionFlags |= EXCEPTION_STACK_INVALID;
return ExceptionContinueExecution;
}
// Make sure stack is DWORD aligned
if ((ULONG_PTR)RegistrationFrame & 3)
{
DPRINT("RegistrationFrameEnd (0x%.08x) is not DWORD aligned.\n",
RegistrationFrameEnd);
ExceptionRecord->ExceptionFlags |= EXCEPTION_STACK_INVALID;
return ExceptionContinueExecution;
}
#endif
#if 0
/* FIXME: */
if (someFlag)
RtlpLogLastExceptionDisposition( hLog, retValue );
#endif
DPRINT("Calling handler at 0x%X\n", RegistrationFrame->handler);
DPRINT("ExceptionRecord 0x%X\n", ExceptionRecord);
DPRINT("RegistrationFrame 0x%X\n", RegistrationFrame);
DPRINT("Context 0x%X\n", Context);
DPRINT("&DispatcherContext 0x%X\n", &DispatcherContext);
ReturnValue = RtlpExecuteHandlerForException(
ExceptionRecord,
RegistrationFrame,
Context,
&DispatcherContext,
RegistrationFrame->handler);
#ifndef NDEBUG
DPRINT("Exception handler said 0x%X\n", ReturnValue);
DPRINT("RegistrationFrame == 0x%.08x\n", RegistrationFrame);
{
PULONG sp = (PULONG)((PVOID)RegistrationFrame - 0x08);
DPRINT("StandardESP == 0x%.08x\n", sp[0]);
DPRINT("Exception Pointers == 0x%.08x\n", sp[1]);
DPRINT("PrevFrame == 0x%.08x\n", sp[2]);
DPRINT("Handler == 0x%.08x\n", sp[3]);
DPRINT("ScopeTable == 0x%.08x\n", sp[4]);
DPRINT("TryLevel == 0x%.08x\n", sp[5]);
DPRINT("EBP == 0x%.08x\n", sp[6]);
}
#endif
if (RegistrationFrame == NULL)
{
ExceptionRecord->ExceptionFlags &= ~EXCEPTION_NESTED_CALL; // Turn off flag
}
if (ReturnValue == ExceptionContinueExecution)
{
DPRINT("ReturnValue == ExceptionContinueExecution\n");
if (ExceptionRecord->ExceptionFlags & EXCEPTION_NONCONTINUABLE)
{
DPRINT("(ExceptionRecord->ExceptionFlags & EXCEPTION_NONCONTINUABLE) == TRUE\n");
ExceptionRecord2.ExceptionRecord = ExceptionRecord;
ExceptionRecord2.ExceptionCode = STATUS_NONCONTINUABLE_EXCEPTION;
ExceptionRecord2.ExceptionFlags = EXCEPTION_NONCONTINUABLE;
ExceptionRecord2.NumberParameters = 0;
RtlRaiseException(&ExceptionRecord2);
}
else
{
/* Copy the (possibly changed) context back to the trap frame and return */
NtContinue(Context, FALSE);
return ExceptionContinueExecution;
}
}
else if (ReturnValue == ExceptionContinueSearch)
{
DPRINT("ReturnValue == ExceptionContinueSearch\n");
/* Nothing to do here */
}
else if (ReturnValue == ExceptionNestedException)
{
DPRINT("ReturnValue == ExceptionNestedException\n");
ExceptionRecord->ExceptionFlags |= EXCEPTION_EXIT_UNWIND;
if (DispatcherContext > Temp)
{
Temp = DispatcherContext;
}
}
else /* if (ReturnValue == ExceptionCollidedUnwind) */
{
DPRINT("ReturnValue == ExceptionCollidedUnwind or unknown\n");
ExceptionRecord2.ExceptionRecord = ExceptionRecord;
ExceptionRecord2.ExceptionCode = STATUS_INVALID_DISPOSITION;
ExceptionRecord2.ExceptionFlags = EXCEPTION_NONCONTINUABLE;
ExceptionRecord2.NumberParameters = 0;
RtlRaiseException(&ExceptionRecord2);
}
RegistrationFrame = RegistrationFrame->prev; // Go to previous frame
}
/* No exception handler will handle this exception */
DPRINT("RtlpDispatchException(): Return ExceptionContinueExecution\n");
return ExceptionContinueExecution;
}
VOID STDCALL
RtlRaiseStatus(NTSTATUS Status)
{
EXCEPTION_RECORD ExceptionRecord;
DPRINT("RtlRaiseStatus(Status 0x%.08x)\n", Status);
ExceptionRecord.ExceptionCode = Status;
ExceptionRecord.ExceptionRecord = NULL;
ExceptionRecord.NumberParameters = 0;
ExceptionRecord.ExceptionFlags = EXCEPTION_NONCONTINUABLE;
RtlRaiseException (& ExceptionRecord);
}
VOID STDCALL
RtlUnwind(PEXCEPTION_REGISTRATION RegistrationFrame,
PVOID ReturnAddress,
PEXCEPTION_RECORD ExceptionRecord,
DWORD EaxValue)
{
PEXCEPTION_REGISTRATION ERHead;
PEXCEPTION_RECORD pExceptRec;
EXCEPTION_RECORD TempER;
CONTEXT Context;
DPRINT("RtlUnwind(). RegistrationFrame 0x%X\n", RegistrationFrame);
#ifndef NDEBUG
RtlpDumpExceptionRegistrations();
#endif /* NDEBUG */
ERHead = SehpGetExceptionList();
DPRINT("ERHead is 0x%X\n", ERHead);
pExceptRec = &TempER;
if (ExceptionRecord == NULL) // The normal case
{
DPRINT("ExceptionRecord == NULL (normal)\n");
pExceptRec->ExceptionFlags = 0;
pExceptRec->ExceptionCode = STATUS_UNWIND;
pExceptRec->ExceptionRecord = NULL;
pExceptRec->ExceptionAddress = ReturnAddress;
pExceptRec->ExceptionInformation[0] = 0;
}
if (RegistrationFrame)
pExceptRec->ExceptionFlags |= EXCEPTION_UNWINDING;
else
pExceptRec->ExceptionFlags |= (EXCEPTION_UNWINDING|EXCEPTION_EXIT_UNWIND);
#ifndef NDEBUG
DPRINT("ExceptionFlags == 0x%x:\n", pExceptRec->ExceptionFlags);
if (pExceptRec->ExceptionFlags & EXCEPTION_UNWINDING)
{
DPRINT(" * EXCEPTION_UNWINDING (0x%x)\n", EXCEPTION_UNWINDING);
}
if (pExceptRec->ExceptionFlags & EXCEPTION_EXIT_UNWIND)
{
DPRINT(" * EXCEPTION_EXIT_UNWIND (0x%x)\n", EXCEPTION_EXIT_UNWIND);
}
#endif /* NDEBUG */
Context.ContextFlags =
(CONTEXT_i386 | CONTEXT_CONTROL | CONTEXT_INTEGER | CONTEXT_SEGMENTS);
SehpCaptureContext(&Context);
DPRINT("Context.Eip = 0x%.08x\n", Context.Eip);
DPRINT("Context.Ebp = 0x%.08x\n", Context.Ebp);
DPRINT("Context.Esp = 0x%.08x\n", Context.Esp);
Context.Esp += 0x10;
Context.Eax = EaxValue;
// Begin traversing the list of EXCEPTION_REGISTRATION
while ((ULONG_PTR)ERHead != (ULONG_PTR)-1)
{
EXCEPTION_RECORD er2;
DPRINT("ERHead 0x%X\n", ERHead);
if (ERHead == RegistrationFrame)
{
DPRINT("Continueing execution\n");
NtContinue(&Context, FALSE);
return;
}
else
{
// If there's an exception frame, but it's lower on the stack
// than the head of the exception list, something's wrong!
if (RegistrationFrame && (RegistrationFrame <= ERHead))
{
DPRINT("The exception frame is bad\n");
// Generate an exception to bail out
er2.ExceptionRecord = pExceptRec;
er2.NumberParameters = 0;
er2.ExceptionCode = STATUS_INVALID_UNWIND_TARGET;
er2.ExceptionFlags = EXCEPTION_NONCONTINUABLE;
RtlRaiseException(&er2);
}
}
#if 0
Stack = ERHead + sizeof(EXCEPTION_REGISTRATION);
if ( (Teb->Tib.StackBase <= (PVOID)ERHead ) // Make sure that ERHead
&& (Teb->Tib.->StackLimit >= (PVOID)Stack ) // is in range, and a multiple
&& (0 == ((ULONG_PTR)ERHead & 3)) ) // of 4 (i.e., sane)
{
#else
if (1) {
#endif
PEXCEPTION_REGISTRATION NewERHead;
PEXCEPTION_REGISTRATION pCurrExceptReg;
EXCEPTION_DISPOSITION ReturnValue;
DPRINT("Executing handler at 0x%X for unwind\n", ERHead->handler);
ReturnValue = RtlpExecuteHandlerForUnwind(
pExceptRec,
ERHead,
&Context,
&NewERHead,
ERHead->handler);
DPRINT("Handler at 0x%X returned 0x%X\n", ERHead->handler, ReturnValue);
if (ReturnValue != ExceptionContinueSearch)
{
if (ReturnValue != ExceptionCollidedUnwind)
{
DPRINT("Bad return value\n");
er2.ExceptionRecord = pExceptRec;
er2.NumberParameters = 0;
er2.ExceptionCode = STATUS_INVALID_DISPOSITION;
er2.ExceptionFlags = EXCEPTION_NONCONTINUABLE;
RtlRaiseException(&er2);
}
else
{
ERHead = NewERHead;
}
}
pCurrExceptReg = ERHead;
ERHead = ERHead->prev;
DPRINT("New ERHead is 0x%X\n", ERHead);
DPRINT("Setting exception registration at 0x%X as current\n",
RegistrationFrame->prev);
// Unlink the exception handler
SehpSetExceptionList(RegistrationFrame->prev);
}
else // The stack looks goofy! Raise an exception to bail out
{
DPRINT("Bad stack\n");
er2.ExceptionRecord = pExceptRec;
er2.NumberParameters = 0;
er2.ExceptionCode = STATUS_BAD_STACK;
er2.ExceptionFlags = EXCEPTION_NONCONTINUABLE;
RtlRaiseException(&er2);
}
}
// If we get here, we reached the end of the EXCEPTION_REGISTRATION list.
// This shouldn't happen normally.
DPRINT("Ran out of exception registrations. RegistrationFrame is (0x%X)\n",
RegistrationFrame);
if ((ULONG_PTR)RegistrationFrame == (ULONG_PTR)-1)
NtContinue(&Context, FALSE);
else
NtRaiseException(pExceptRec, &Context, 0);
}
/* EOF */
Reference in a new issue View git blame Copy permalink