winext.asm

来自「开放源码的编译器open watcom 1.6.0版的源代码」· 汇编 代码 · 共 78 行

;*****************************************************************************
;*
;*                            Open Watcom Project
;*
;*    Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved.
;*
;*  ========================================================================
;*
;*    This file contains Original Code and/or Modifications of Original
;*    Code as defined in and that are subject to the Sybase Open Watcom
;*    Public License version 1.0 (the 'License'). You may not use this file
;*    except in compliance with the License. BY USING THIS FILE YOU AGREE TO
;*    ALL TERMS AND CONDITIONS OF THE LICENSE. A copy of the License is
;*    provided with the Original Code and Modifications, and is also
;*    available at www.sybase.com/developer/opensource.
;*
;*    The Original Code and all software distributed under the License are
;*    distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
;*    EXPRESS OR IMPLIED, AND SYBASE AND ALL CONTRIBUTORS HEREBY DISCLAIM
;*    ALL SUCH WARRANTIES, INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF
;*    MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR
;*    NON-INFRINGEMENT. Please see the License for the specific language
;*    governing rights and limitations under the License.
;*
;*  ========================================================================
;*
;* Description:  WHEN YOU FIGURE OUT WHAT THIS FILE DOES, PLEASE
;*               DESCRIBE IT HERE!
;*
;*****************************************************************************


;****************************************************************************
;***                                                                      ***
;*** WINEXT.ASM - windows extender                                        ***
;***                                                                      ***
;****************************************************************************
.386p

DGROUP group _DATA

;*
;*** externals we need
;*
extrn   _SaveSP:DWORD
extrn   _DataSelector:WORD
extrn   _StackSelector:WORD
extrn   _EntryStackSave:DWORD
extrn   _ReturnCode:DWORD
extrn   _StackSize:DWORD
extrn   _EDataAddr:DWORD
extrn   _CodeEntry:FWORD

_DATA segment word public 'DATA' use16

PUBLIC  _InDebugger
_InDebugger     dw 0

_DATA ends

;*
;*** the windows extender code lies here
;*
_TEXT segment word public 'CODE' use16
assume cs:_TEXT

;****************************************************************************
;***                                                                      ***
;*** InvokeWin32 - invoke a 32-bit application                            ***
;***                                                                      ***
;***       The 32 bit application must save gs, since that is our pointer ***
;***       to our data segment (given to us by windows)                   ***
;***                                                                      ***
;***       Our program image is as follows:                               ***
;***                                                                      ***
;***            0 -> send          Stack                                  ***
;***            send+1 -> cend     Code                                   ***
;***            cend+1 ->