317 lines
7.8 KiB
NASM
317 lines
7.8 KiB
NASM
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title "Raise Exception"
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;++
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;
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; Copyright (c) 1990 Microsoft Corporation
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;
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; Module Name:
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;
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; raisests.asm
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;
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; Abstract:
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;
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; This module implements the function to raise a software exception.
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;
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; Author:
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;
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; Bryan Willman 11 Nov 90
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;
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; Environment:
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;
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; Any mode.
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;
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; Revision History:
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;
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;--
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.386p
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.xlist
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include ks386.inc
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include callconv.inc ; calling convention macros
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.list
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EXTRNP _RtlDispatchException,2
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EXTRNP _ZwContinue,2
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EXTRNP _ZwRaiseException,3
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_TEXT$01 SEGMENT DWORD PUBLIC 'CODE'
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ASSUME DS:FLAT, ES:FLAT, SS:NOTHING, FS:NOTHING, GS:NOTHING
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;
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; Context flags definition.
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;
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CONTEXT_SETTING EQU CONTEXT_INTEGER OR CONTEXT_CONTROL OR CONTEXT_SEGMENTS
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;
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; Exception record length definition.
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;
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EXCEPTION_RECORD_LENGTH EQU (ErExceptionInformation + 16) AND 0fffffff0H
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page
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subttl "Raise Software Exception"
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;++
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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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;
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; This function raises a software exception by building a context record,
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; establishing the stack limits of the current processor mode, and calling
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; the exception dispatcher. If the exception dispatcher finds a handler
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; to process the exception, then control is returned to the caller using
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; the NtContinue system service. Otherwise the NtLastChance system service
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; is called to provide default handing.
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;
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; N.B. On the 386, floating point state is not defined for non-fp
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; exceptions. Therefore, this routine does not attempt to
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; capture it.
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;
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; This means this routine cannot be used to report fp exceptions.
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;
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; Arguments:
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;
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; ExceptionRecord (ebp+8) - Supplies a pointer to an exception record.
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;
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; Return Value:
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;
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; None.
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;
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;--
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cPublicProc _ExRaiseException , 1
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push ebp
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mov ebp,esp
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pushfd ; save flags before sub
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sub esp,ContextFrameLength ; Allocate a context record
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;
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; Save regs we use in context record
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;
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mov [(ebp-ContextFrameLength-4)+CsEax],eax
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mov [(ebp-ContextFrameLength-4)+CsEcx],ecx
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;
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; Get pointer to exception report record, and set the exceptionaddress
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; field to be our return address
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;
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mov eax,[ebp+8] ; (eax) -> ExceptionReportRecord
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mov ecx,[ebp+4]
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mov [eax.ErExceptionAddress],ecx
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;
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; Copy machine context into the context record
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;
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lea eax,[ebp-ContextFrameLength-4] ; (eax) -> Context record
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mov [eax.CsEip],ecx
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mov [eax.CsEbx],ebx
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mov [eax.CsEdx],edx
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mov [eax.CsEsi],esi
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mov [eax.CsEdi],edi
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lea ecx,[ebp+8]
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mov [eax.CsEsp],ecx
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mov ecx,[ebp]
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mov [eax.CsEbp],ecx
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mov ecx,[ebp-4]
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mov [eax.CsEflags],ecx
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mov dword ptr [eax.CsSegCs],cs
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mov dword ptr [eax.CsSegDs],ds
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mov dword ptr [eax.CsSegEs],es
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mov dword ptr [eax.CsSegFs],fs
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mov dword ptr [eax.CsSegGs],gs
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mov dword ptr [eax.CsSegSs],ss
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;
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; Set Context flags, note that FLOATING_POINT is NOT set.
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;
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mov dword ptr [eax.CsContextFlags],CONTEXT_SETTING
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;
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; _RtlDispatchException(ExceptionRecord, ContextRecord)
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;
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stdCall _RtlDispatchException, <[ebp+8],eax>
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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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lea ecx,[ebp-ContextFrameLength-4] ; (eax) -> Context record
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or eax, eax
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jz short ere10
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stdCall _ZwContinue, <ecx,0>
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jmp short ere20
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ere10:
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stdCall _ZwRaiseException, <[ebp+8],ecx,0>
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ere20:
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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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stdCall _ExRaiseStatus, <eax>
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stdENDP _ExRaiseException
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page
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subttl "Raise Software Exception"
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;++
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;
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; VOID
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; ExRaiseStatus (
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; IN NTSTATUS Status
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; )
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;
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; Routine Description:
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;
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; This function raises a software exception with the specified status value
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; by building a context record, establishing the stack limits of the current
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; processor mode, and calling the exception dispatcher. If the exception
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; dispatcher finds a handler to process the exception, then control is
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; returned to the caller using the NtContinue system service. Otherwise
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; the NtLastChance system service is called to provide default handing.
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;
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; N.B. On the 386, floating point state is not defined for non-fp
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; exceptions. Therefore, this routine does not attempt to
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; capture it.
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;
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; This means this routine cannot be used to report fp exceptions.
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;
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; Arguments:
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;
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; Status - Supplies the status value to be used as the exception code
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; for the exception that is to be raised.
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;
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; Return Value:
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;
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; None.
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; Arguments:
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;
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;--
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cPublicProc _ExRaiseStatus,1
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push ebp
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mov ebp,esp
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pushfd ; save flags before sub
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sub esp,ContextFrameLength+ExceptionRecordLength
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;
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; Save regs we use in context record
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;
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mov [(ebp-ContextFrameLength-4)+CsEax],eax
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mov [(ebp-ContextFrameLength-4)+CsEcx],ecx
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;
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; Copy machine context into the context record
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;
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lea eax,[ebp-ContextFrameLength-4] ; (eax) -> Context record
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mov ecx,[ebp+4] ; [ecx] = returned address
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mov [eax.CsEip],ecx
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mov [eax.CsEbx],ebx
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mov [eax.CsEdx],edx
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mov [eax.CsEsi],esi
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mov [eax.CsEdi],edi
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lea ecx,[ebp+8]
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mov [eax.CsEsp],ecx
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mov ecx,[ebp]
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mov [eax.CsEbp],ecx
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mov ecx,[ebp-4]
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mov [eax.CsEflags],ecx
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mov dword ptr [eax.CsSegCs],cs
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mov dword ptr [eax.CsSegDs],ds
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mov dword ptr [eax.CsSegEs],es
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mov dword ptr [eax.CsSegFs],fs
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mov dword ptr [eax.CsSegGs],gs
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mov dword ptr [eax.CsSegSs],ss
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;
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; Set Context flags, note that FLOATING_POINT is NOT set.
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;
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mov dword ptr [eax.CsContextFlags],CONTEXT_SETTING
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;
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; Get pointer to exception report record, and set the exceptionaddress
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; field to be our return address
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;
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lea eax,[ebp-ContextFrameLength-ExceptionRecordLength-4]
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; (eax) -> ExceptionRecord
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mov ecx,[ebp+4]
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mov dword ptr [eax.ErExceptionAddress],ecx
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mov ecx,[ebp+8]
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mov dword ptr [eax.ErExceptionCode],ecx
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mov dword ptr [eax.ErNumberParameters], 0
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mov dword ptr [eax.ErExceptionRecord], 0
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mov dword ptr [eax.ErExceptionFlags], EXCEPTION_NONCONTINUABLE
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;
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; _RtlDispatchException(ExceptionRecord, ContextRecord)
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;
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lea ecx,[ebp-ContextFrameLength-4] ; (eax) -> Context record
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; ecx - Context record
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; eax - Exception record
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stdCall _RtlDispatchException, <eax, ecx>
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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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;
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; _ZwRaiseException(ExceptionRecord, ContextRecord, FirstChance=TRUE)
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;
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lea ecx,[ebp-ContextFrameLength-4] ; (eax) -> Context record
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lea eax,[ebp-ContextFrameLength-ExceptionRecordLength-4]
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; 1 - TRUE
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; ecx - Context Record
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; eax - Exception Report Record
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stdCall _ZwRaiseException, <eax, ecx, 1>
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;
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; We came back, suggesting some sort of error in the call. Raise
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; a status exception to report this, return from ZwRaiseException is type.
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;
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stdCall _ExRaiseStatus, <eax>
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stdENDP _ExRaiseStatus
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_TEXT$01 ends
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end
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