title  "User Callback Return"


; Copyright (c) 1985 - 1999, Microsoft Corporation

; Module Name:

;    callret.asm

; Abstract:

;    This module implements the fastpath callback return.

; Author:

;    David N. Cutler (davec) 21-Dec-95

; Environment:

;    User mode.

; Revision History:



.386p
        .xlist
include callconv.inc            ; calling convention macros
        .list

_TEXT   SEGMENT DWORD PUBLIC 'CODE'
        ASSUME  DS:FLAT, ES:FLAT, SS:NOTHING, FS:NOTHING, GS:NOTHING

        page ,132
        subttl  "Return from User Mode Callback"

ifndef BUILD_WOW6432


; NTSTATUS
; FASTCALL
; XyCallbackReturn (
;    IN PVOID OutputBuffer OPTIONAL,
;    IN ULONG OutputLength,
;    IN NTSTATUS Status
;    )

; Routine Description:

;    This function returns from a user mode callout to the kernel mode
;    caller of the user mode callback function.

; Arguments:

;    OutputBuffer (ecx) - Supplies an optional pointer to an output buffer.

;    OutputLength (edx) - Supplies the length of the output buffer.

;    Status (esp + 4) - Supplies the status value returned to the caller of the
;        callback function.

; Return Value:

;    Normally there is no return from this function. If a callbac is not active,
;    then the error status is returned to the caller.



cPublicFastCall XyCallbackReturn, 3

        mov     eax,[esp] + 4           ; get return status value
        int     02bH                    ; call fast path system service
        fstRET  XyCallbackReturn        ; return status to caller

fstENDP XyCallbackReturn
endif

_TEXT   ends
        end