Source code of Windows XP (NT5)
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;
; 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,
; DWORD ignore); /* Always NULL - ignore */
;
; 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.
;
; Note - The last parameter to LibMain is included for compatibility
; reasons. Applications that wish to modify this file and remove the
; parameter from LibMain may do so by simply removing the two
; "push" instructions below marked with "****".
;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
include cmacros.inc
externFP <LibMain> ; the C routine to be called
createSeg INIT_TEXT, INIT_TEXT, BYTE, PUBLIC, CODE
sBegin INIT_TEXT
assumes CS,INIT_TEXT
?PLM=0 ; 'C'naming
;externA <_acrtused> ; ensures that Win DLL startup code is linked
?PLM=1 ; 'PASCAL' naming
externFP <LocalInit> ; Windows heap init routine
cProc LibEntry, <PUBLIC,FAR> ; entry point into DLL
include CONVDLL.INC
cBegin
push di ; handle of the module instance
push ds ; library data segment
push cx ; heap size
push es ; Always NULL **** May remove (see above)
push si ; Always NULL **** May remove (see above)
; 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);
xor ax,ax
cCall LocalInit <ds, ax, cx>
or ax,ax ; did it do it ok ?
jz error ; 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
error:
pop si ; clean up stack on a LocalInit error
pop es
pop cx
pop ds
pop di
exit:
cEnd
sEnd INIT_TEXT
end LibEntry