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title "Callback Routines";++;; Copyright (c) 1985 - 1999, Microsoft Corporation;; Module Name:;; callproc.asm;; Abstract:;; This module implements stack cleanup to gaurd against cdecl; declared wndprocs.; Bug 234292;; Author:;; Joseph Jones (joejo) 12/4/98;;; Revision History:;;--
.386p .xlistinclude ks386.incinclude callconv.inc ; calling convention macros .list
_TEXT SEGMENT DWORD PUBLIC 'CODE' ASSUME DS:FLAT, ES:FLAT, SS:NOTHING, FS:NOTHING, GS:NOTHING
page , 132
;++;;LRESULT;InternalCallWinProc(; WNDPROC winproc,; HWND hwnd,; UINT message,; WPARAM wParam,; LPARAM lParam; );; Routine Description:;; this function cals an x86 window procedure. It protects against; window procedures that don't preserve EBX or fail to clean up; enough stack.;; The only register that the window proc cannot trash is ESI.;; Arguments:;; winproc - x86 Procedure to call;; hwnd - window handle that sent the message;; message - message being sent;; wParam - wParam argument to window procedure;; lParam - lParam argument to window proc;; Return Value:;; LRESULT return value from called window procedure;;--
cPublicProc _InternalCallWinProc , 5
winproc equ [ebp + 8]hwnd equ [ebp + 12]message equ [ebp + 16]wParam equ [ebp + 20]lParam equ [ebp + 24]
StackGuard equ 0DCBAABCDh
push ebp mov ebp, esp
push esi push edi push ebx
push StackGuard ; push guard on the stack push esi ; push another DWORD on the stack ; so that bogus apps that treat &lParam ; as an LPPOINT don't corrupt the StackGuard
push lParam push wParam push message push hwnd call winproc
cmp DWORD PTR [esp+4], StackGuard je goodCalling
;--; Bug 386625: fix for Corel Presentation 9.0 that restores the stack; for 5 parameters instead of 4;--
cmp DWORD PTR [esp], StackGuard jne fixupTheStack sub esp, 04h jmp goodCalling
fixupTheStack: add esp, 010h ; fix up the stack
goodCalling: add esp, 08h ; pop the extra DWORD ; pop the second StackGuard
pop ebx pop edi pop esi
pop ebp stdRET _InternalCallWinProcstdENDP _InternalCallWinProc
;/*; * Bug 246472 - joejo; * fixup all DDE Callbacks since some apps make their callbacks; * C-Style instead of PASCAL.; */
;++;;HDDEDATA;UserCallDDECallback(; UINT wType,; UINT wFmt,; HCONV hConv,; HSZ hsz1,; HSZ hsz2,; HDDEDATA hData,; ULONG_PTR dwData1,; ULONG_PTR dwData2; );; Routine Description:;; this function cals an x86 DDE Callback procedure. It protects against; callback procedures that don't preserve EBX or fail to clean up; enough stack.;; The only register that the window proc cannot trash is ESI.;; Arguments:;; pfnDDECallback - DDE Callback function pointer; wType; wFmt; hConv; hsz1; hsz2; hData; dwData1; dwData2;; Return Value:;; HDDEDATA - Handle to a returnded DDE Data object;;--
cPublicProc _UserCallDDECallback , 9
pfnDDECallback equ [ebp + 8]wType equ [ebp + 12]wFmt equ [ebp + 16]hConv equ [ebp + 20]hsz1 equ [ebp + 24]hsz2 equ [ebp + 28]hData equ [ebp + 32]dwData1 equ [ebp + 36]dwData2 equ [ebp + 40]
push ebp mov ebp, esp push esi ; save esi across the call push edi ; save edi across the call push ebx ; save ebx on the stack across the call mov esi,esp ; save the stack pointer in esi across the call push dwData2 push dwData1 push hData push hsz2 push hsz1 push hConv push wFmt push wType call pfnDDECallback mov esp,esi ; restore the stack pointer in case callee forgot to clean up pop ebx ; restore ebx pop edi ; restore edi pop esi ; restore esi pop ebp stdRET _UserCallDDECallbackstdENDP _UserCallDDECallback
_TEXT ends
end
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