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Diffstat (limited to 'private/ntos/rtl/i386/raise.asm')
| -rw-r--r-- | private/ntos/rtl/i386/raise.asm | 181 |
1 files changed, 181 insertions, 0 deletions
diff --git a/private/ntos/rtl/i386/raise.asm b/private/ntos/rtl/i386/raise.asm new file mode 100644 index 000000000..18f928fed --- /dev/null +++ b/private/ntos/rtl/i386/raise.asm @@ -0,0 +1,181 @@ + title "Raise Exception" +;++ +; +; Copyright (c) 1989 Microsoft Corporation +; +; Module Name: +; +; raise.asm +; +; Abstract: +; +; This module implements the function to raise a software exception. +; +; Author: +; +; Bryan Willman 11 april 90 +; +; Environment: +; +; Any mode. +; +; Revision History: +; +;-- +.386p + .xlist +include ks386.inc +include callconv.inc ; calling convention macros + .list + + EXTRNP _ZwRaiseException,3 + +_TEXT SEGMENT DWORD PUBLIC 'CODE' + ASSUME DS:FLAT, ES:FLAT, SS:NOTHING, FS:NOTHING, GS:NOTHING + +; +; Context flags definition. +; + +CONTEXT_SETTING EQU CONTEXT_INTEGER OR CONTEXT_CONTROL OR CONTEXT_SEGMENTS + + +; +; Exception record length definition. +; + +EXCEPTION_RECORD_LENGTH EQU (ErExceptionInformation + 16) AND 0fffffff0H + + page + subttl "Raise Software Exception" +;++ +; +; VOID +; RtlRaiseException ( +; IN PEXCEPTION_RECORD ExceptionRecord +; ) +; +; Routine Description: +; +; This function raises a software exception by building a context record, +; establishing the stack limits of the current processor mode, and calling +; the exception dispatcher. If the exception dispatcher finds a handler +; to process the exception, then control is returned to the caller using +; the NtContinue system service. Otherwise the NtLastChance system service +; is called to provide default handing. +; +; N.B. On the 386, floating point state is not defined for non-fp +; exceptions. Therefore, this routine does not attempt to +; capture it. +; +; This means this routine cannot be used to report fp exceptions. +; +; Arguments: +; +; ExceptionRecord (ebp+8) - Supplies a pointer to an exception record. +; +; Return Value: +; +; None. +; +;-- + +cPublicProc _RtlRaiseException ,1 + + push ebp + mov ebp,esp + pushfd ; save flags before sub + sub esp,ContextFrameLength ; Allocate a context record + +; +; Save regs we use in context record +; + + mov [(ebp-ContextFrameLength-4)+CsEax],eax + mov [(ebp-ContextFrameLength-4)+CsEcx],ecx + +; +; Get pointer to exception report record, and set the exceptionaddress +; field to be our return address +; + + mov eax,[ebp+8] ; (eax) -> ExceptionReportRecord + + mov ecx,[ebp+4] + mov [eax.ErExceptionAddress],ecx + +; +; Copy machine context into the context record +; + + + lea eax,[ebp-ContextFrameLength-4] ; (eax) -> Context record + + mov [eax.CsEip],ecx + + mov [eax.CsEbx],ebx + mov [eax.CsEdx],edx + + mov [eax.CsEsi],esi + mov [eax.CsEdi],edi + +; +; context record's ESP must have the argument popped off the stack +; + + lea ecx,[ebp+12] + + mov [eax.CsEsp],ecx + + mov ecx,[ebp] + mov [eax.CsEbp],ecx + + mov ecx,[ebp-4] + mov [eax.CsEflags],ecx + + mov dword ptr [eax.CsSegCs],cs + mov dword ptr [eax.CsSegDs],ds + mov dword ptr [eax.CsSegEs],es + mov dword ptr [eax.CsSegFs],fs + mov dword ptr [eax.CsSegGs],gs + mov dword ptr [eax.CsSegSs],ss + +; +; Set Context flags, note that FLOATING_POINT is NOT set. +; + + mov dword ptr [eax.CsContextFlags],CONTEXT_SETTING + +; +; _ZwRaiseException(ExceptionRecord, ContextRecord, FirstChance=TRUE) +; + +; 1 - TRUE +; eax - Context Record +; [ebp+8] - Exception Report Record + + stdCall _ZwRaiseException,<[ebp+8],eax,1> + +; +; We came back, suggesting some sort of error in the call. Raise +; a status exception to report this, return from ZwRaiseException is type. +; + + sub esp,EXCEPTION_RECORD_LENGTH ; allocate record on stack, esp is base + mov [esp.ErExceptionCode],eax ; set exception type + or dword ptr [esp.ErExceptionFlags],EXCEPTION_NONCONTINUABLE + mov dword ptr [esp.ErNumberParameters],0 ; no parms + mov eax,[ebp+8] + mov [esp.ErExceptionRecord],eax ; point back to first exception + mov eax,esp + stdCall _RtlRaiseException,<eax> + +; +; We will never come here, because RtlRaiseException will not allow +; return if exception is non-continuable. +; + +stdENDP _RtlRaiseException + +_TEXT ends + end |