73 lines
2.2 KiB
NASM
73 lines
2.2 KiB
NASM
|
PAGE ,132
|
||
|
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
||
|
|
;
|
||
|
|
; LIBENTRY.ASM
|
||
|
|
;
|
||
|
|
; Windows dynamic link library entry routine
|
||
|
|
;
|
||
|
|
; This module generates a code segment called INIT_TEXT.
|
||
|
|
; It initializes the local heap if one exists and then calls
|
||
|
|
; the C routine LibMain() which should have the form:
|
||
|
|
; BOOL FAR PASCAL LibMain(HANDLE hInstance,
|
||
|
|
; WORD wDataSeg,
|
||
|
|
; WORD cbHeap,
|
||
|
|
; LPSTR lpszCmdLine);
|
||
|
|
;
|
||
|
|
; The result of the call to LibMain is returned to Windows.
|
||
|
|
; The C routine should return TRUE if it completes initialization
|
||
|
|
; successfully, FALSE if some error occurs.
|
||
|
|
;
|
||
|
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
||
|
|
|
||
|
|
extrn LibMain:far ; the C routine to be called
|
||
|
|
extrn LocalInit:far ; Windows heap init routine
|
||
|
|
extrn __acrtused:abs ; ensures that Win DLL startup code is linked
|
||
|
|
|
||
|
|
public LibEntry ; entry point for the DLL
|
||
|
|
|
||
|
|
INIT_TEXT segment byte public 'CODE'
|
||
|
|
assume cs:INIT_TEXT
|
||
|
|
|
||
|
|
LibEntry proc far
|
||
|
|
|
||
|
|
push di ; handle of the module instance
|
||
|
|
push ds ; library data segment
|
||
|
|
push cx ; heap size
|
||
|
|
push es ; command line segment
|
||
|
|
push si ; command line offset
|
||
|
|
|
||
|
|
; if we have some heap then initialize it
|
||
|
|
jcxz callc ; jump if no heap specified
|
||
|
|
|
||
|
|
; call the Windows function LocalInit() to set up the heap
|
||
|
|
; LocalInit((LPSTR)start, WORD cbHeap);
|
||
|
|
|
||
|
|
push ds ; Heap segment
|
||
|
|
xor ax,ax
|
||
|
|
push ax ; Heap start offset in segment
|
||
|
|
push cx ; Heap end offset in segment
|
||
|
|
call LocalInit ; try to initialize it
|
||
|
|
or ax,ax ; did it do it ok ?
|
||
|
|
jz nocall ; quit if it failed
|
||
|
|
|
||
|
|
; invoke the C routine to do any special initialization
|
||
|
|
|
||
|
|
callc:
|
||
|
|
call LibMain ; invoke the 'C' routine (result in AX)
|
||
|
|
jmp short exit ; LibMain is responsible for stack clean up
|
||
|
|
|
||
|
|
nocall: ; clean up passed params
|
||
|
|
pop si ; if LocalInit fails.
|
||
|
|
pop es
|
||
|
|
pop cx
|
||
|
|
pop ds
|
||
|
|
pop di
|
||
|
|
exit:
|
||
|
|
ret ; return the result
|
||
|
|
|
||
|
|
LibEntry endp
|
||
|
|
|
||
|
|
INIT_TEXT ends
|
||
|
|
|
||
|
|
end LibEntry
|