269 lines
6.2 KiB
C
269 lines
6.2 KiB
C
/*++
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Copyright (c) 1990 Microsoft Corporation
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Module Name:
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raisests.c
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Abstract:
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This module implements routines to raise a general exception from kernel
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mode or a noncontinuable exception from kernel mode.
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Author:
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David N. Cutler (davec) 18-Oct-1990
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Environment:
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Any mode.
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Revision History:
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Tom Wood 23-Aug-1994
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Add stack limit parameters to RtlVirtualUnwind.
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--*/
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#include "exp.h"
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//
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// Define private function prototypes.
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//
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VOID
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ExpRaiseException (
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IN PEXCEPTION_RECORD ExceptionRecord
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);
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VOID
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ExpRaiseStatus (
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IN NTSTATUS ExceptionCode
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);
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VOID
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ExRaiseException (
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IN PEXCEPTION_RECORD ExceptionRecord
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)
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/*++
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Routine Description:
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This function raises a software exception by building a context record
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and calling the exception dispatcher directly.
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N.B. This routine is a shell routine that simply calls another routine
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to do the real work. The reason this is done is to avoid a problem
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in try/finally scopes where the last statement in the scope is a
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call to raise an exception.
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Arguments:
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ExceptionRecord - Supplies a pointer to an exception record.
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Return Value:
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None.
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--*/
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{
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ExpRaiseException(ExceptionRecord);
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return;
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}
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VOID
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ExpRaiseException (
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IN PEXCEPTION_RECORD ExceptionRecord
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)
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/*++
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Routine Description:
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This function raises a software exception by building a context record
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and calling the exception dispatcher directly.
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Arguments:
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ExceptionRecord - Supplies a pointer to an exception record.
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Return Value:
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None.
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--*/
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{
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ULONG ControlPc;
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CONTEXT ContextRecord;
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ULONG EstablisherFrame;
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PRUNTIME_FUNCTION FunctionEntry;
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BOOLEAN InFunction;
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ULONG NextPc;
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NTSTATUS Status;
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//
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// Capture the current context, virtually unwind to the caller of this
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// routine, set the fault instruction address to that of the caller, and
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// call the exception dispatcher.
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//
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RtlCaptureContext(&ContextRecord);
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ControlPc = ContextRecord.Lr - 4;
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FunctionEntry = RtlLookupFunctionEntry(ControlPc);
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NextPc = RtlVirtualUnwind(ControlPc,
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FunctionEntry,
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&ContextRecord,
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&InFunction,
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&EstablisherFrame,
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NULL,
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0,
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0xffffffff);
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ContextRecord.Iar = NextPc + 4;
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ExceptionRecord->ExceptionAddress = (PVOID)ContextRecord.Iar;
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//
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// If the exception is successfully dispatched, then continue execution.
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// Otherwise, give the kernel debugger a chance to handle the exception.
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//
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if (RtlDispatchException(ExceptionRecord, &ContextRecord)) {
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Status = ZwContinue(&ContextRecord, FALSE);
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} else {
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Status = ZwRaiseException(ExceptionRecord, &ContextRecord, FALSE);
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}
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//
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// Either the attempt to continue execution or the attempt to give
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// the kernel debugger a chance to handle the exception failed. Raise
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// a noncontinuable exception.
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//
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ExRaiseStatus(Status);
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}
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VOID
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ExRaiseStatus (
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IN NTSTATUS ExceptionCode
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)
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/*++
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Routine Description:
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This function raises an exception with the specified status value by
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building an exception record, building a context record, and calling the
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exception dispatcher directly. The exception is marked as noncontinuable
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with no parameters. There is no return from this function.
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N.B. This routine is a shell routine that simply calls another routine
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to do the real work. The reason this is done is to avoid a problem
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in try/finally scopes where the last statement in the scope is a
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call to raise an exception.
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Arguments:
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ExceptionCode - Supplies the status value to be used as the exception
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code for the exception that is to be raised.
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Return Value:
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None.
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--*/
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{
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ExpRaiseStatus(ExceptionCode);
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return;
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}
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VOID
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ExpRaiseStatus (
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IN NTSTATUS ExceptionCode
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)
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/*++
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Routine Description:
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This function raises an exception with the specified status value by
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building an exception record, building a context record, and calling the
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exception dispatcher directly. The exception is marked as noncontinuable
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with no parameters. There is no return from this function.
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Arguments:
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ExceptionCode - Supplies the status value to be used as the exception
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code for the exception that is to be raised.
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Return Value:
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None.
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--*/
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{
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ULONG ControlPc;
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CONTEXT ContextRecord;
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ULONG EstablisherFrame;
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EXCEPTION_RECORD ExceptionRecord;
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PRUNTIME_FUNCTION FunctionEntry;
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BOOLEAN InFunction;
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ULONG NextPc;
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NTSTATUS Status;
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//
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// Construct an exception record.
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//
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ExceptionRecord.ExceptionCode = ExceptionCode;
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ExceptionRecord.ExceptionRecord = (PEXCEPTION_RECORD)NULL;
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ExceptionRecord.NumberParameters = 0;
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ExceptionRecord.ExceptionFlags = EXCEPTION_NONCONTINUABLE;
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//
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// Capture the current context, virtually unwind to the caller of this
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// routine, set the fault instruction address to that of the caller, and
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// call the exception dispatcher.
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//
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RtlCaptureContext(&ContextRecord);
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ControlPc = ContextRecord.Lr - 4;
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FunctionEntry = RtlLookupFunctionEntry(ControlPc);
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NextPc = RtlVirtualUnwind(ControlPc,
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FunctionEntry,
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&ContextRecord,
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&InFunction,
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&EstablisherFrame,
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NULL,
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0,
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0xffffffff);
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ContextRecord.Iar = NextPc + 4;
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ExceptionRecord.ExceptionAddress = (PVOID)ContextRecord.Iar;
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RtlDispatchException(&ExceptionRecord, &ContextRecord);
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//
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// An unwind was not initiated during the dispatching of a noncontinuable
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// exception. Give the kernel debugger a chance to handle the exception.
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//
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Status = ZwRaiseException(&ExceptionRecord, &ContextRecord, FALSE);
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//
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// The attempt to give the kernel debugger a chance to handle the exception
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// failed. Raise another noncontinuable exception.
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//
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ExRaiseStatus(Status);
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}
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