121 lines
2.9 KiB
NASM
121 lines
2.9 KiB
NASM
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title "Miscellaneous Exception Handling"
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;++
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;
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; Copyright (c) 1989 Microsoft Corporation
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;
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; Module Name:
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;
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; xcptmisc.asm
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;
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; Abstract:
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;
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; This module implements miscellaneous routines that are required to
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; support exception handling. Functions are provided to call an exception
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; handler for an exception, call an exception handler for unwinding, get
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; the caller's stack pointer, get the caller's frame pointer, get the
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; caller's floating status, get the caller's processor state, get the
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; caller's extended processor status, and get the current stack limits.
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;
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; Author:
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;
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; David N. Cutler (davec) 14-Aug-1989
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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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; Keith Moore (keithmo) 12-Sep-1997
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;
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; Stolen from ntdll for use in IIS.
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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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_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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page
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subttl "Capture Context"
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;++
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;
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; VOID
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; PuDbgCaptureContext (PCONTEXT ContextRecord)
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;
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; Routine Description:
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;
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; This fucntion fills in the specified context record with the
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; current state of the machine, except that the values of EBP
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; and ESP are computed to be those of the caller's caller.
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;
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; N.B. This function assumes it is called from a 'C' procedure with
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; the old ebp at [ebp], the return address at [ebp+4], and
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; old esp = ebp + 8.
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;
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; Certain 'C' optimizations may cause this to not be true.
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;
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; N.B. This function does NOT adjust ESP to pop the arguments off
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; the caller's stack. In other words, it provides a __cdecl ESP,
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; NOT a __stdcall ESP. This is mainly because we can't figure
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; out how many arguments the caller takes.
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;
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; N.B. Floating point state is NOT captured.
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;
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; Arguments:
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;
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; ContextRecord (esp+4) - Address of context record to fill in.
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;
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; Return Value:
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;
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; The caller's return address.
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;
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;--
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cPublicProc _PuDbgCaptureContext ,1
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push ebx
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mov ebx,[esp+8] ; (ebx) -> ContextRecord
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mov dword ptr [ebx.CsEax],eax
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mov dword ptr [ebx.CsEcx],ecx
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mov dword ptr [ebx.CsEdx],edx
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mov eax, [esp]
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mov dword ptr [ebx.CsEbx],eax
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mov dword ptr [ebx.CsEsi],esi
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mov dword ptr [ebx.CsEdi],edi
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mov [ebx.CsSegCs],cs
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mov [ebx.CsSegDs],ds
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mov [ebx.CsSegEs],es
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mov [ebx.CsSegFs],fs
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mov [ebx.CsSegGs],gs
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mov [ebx.CsSegSs],ss
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pushfd
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pop [ebx.CsEflags]
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mov eax,[ebp+4]
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mov [ebx.CsEip],eax
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mov eax,[ebp]
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mov [ebx.CsEbp],eax
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lea eax,[ebp+8]
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mov [ebx.CsEsp],eax
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pop ebx
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stdRET _PuDbgCaptureContext
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stdENDP _PuDbgCaptureContext
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_TEXT$01 ends
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end
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