wincall.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 619 行 · 第 1/2 页

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        public  __CallBack_
__CallBack_ proc        near
        pop     DX                      ; get return address
        inc     BP                      ; standard Windows prolog
        push    BP                      ; ...
        mov     BP,SP                   ; ... get access to parms
        push    DS                      ; save DS
ifdef DLL32
        mov     AX,DGROUP
        mov     DS,AX                   ; get access to DGROUP
else
        push    SS                      ; SS points to DGROUP
        pop     DS                      ; set DS to DGROUP
endif
        mov     AX,offset __CallBack_-1 ; calc. callback index
        sub     AX,DX                   ; ...
        mov     DX,AX                   ; ...
        mov     AX,SS                   ; get 16-bit stack selector
        mov     word ptr _EntryStackSave,SP     ; save current sp
        mov     word ptr _EntryStackSave+2,SS   ; save stack segment
        mov     ES,_DataSelector        ; get 32-bit data selector
        mov     SS,_StackSelector       ; switch to 32-bit stack
        mov     ESP,_SaveSP             ; ...
        push    _EntryStackSave         ; save 16-bit SS:SP on 32-bit stack
        call    __32BitCallBackAddr     ; go over to 32-bit side
        lea     ECX,4[ESP]              ; calc. value for 32-bit stack pointer
        mov     _SaveSP,ECX             ; save 32-bit stack pointer 22-nov-93
        lss     SP,[ESP]                ; switch back to 16-bit stack
        pop     DS                      ; restore DS
        pop     BP                      ; restore BP
        dec     BP                      ; ...
        pop     BX                      ; get return address
        pop     CX                      ; ...
        mov     DH,0                    ; zero high byte of stack adjustment
        add     SP,DX                   ; adjust stack pointer
        push    CX                      ; push return address
        push    BX                      ; ...
        push    EAX                     ; push return value
        pop     AX                      ; pop return value into DX:AX
        pop     DX                      ; ...
        retf                            ; return
__CallBack_ endp

_TEXT   ends
        end