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From: bright@Data-IO.COM (Walter Bright)
Newsgroups: comp.windows.ms
Subject: Windows prolog/epilog
Message-ID: <1992@dataio.Data-IO.COM>
Date: 22 May 89 21:07:58 GMT
Reply-To: bright@dataio.Data-IO.COM (Walter Bright)
Organization: Data I/O Corporation; Redmond, WA
Lines: 22
References:

In examining the Windows prolog and epilog code for functions, it is:
prolog:
	mov	AX,DS		;?????
	nop			;?????
	inc	BP		;?????
	push	BP		;save previous
	mov	BP,SP		;setup frame pointer for locals
	push	DS
	mov	DS,AX
	sub	SP,xx		;make room for locals

epilog:
	sub	BP,2		;account for the PUSH DS
	mov	SP,BP		;remove locals
	pop	DS
	pop	BP
	dec	BP		;????
	ret

Can anybody explain what's going on with the DS manipulation, the NOP
and the inc and dec of BP? I suspect that the MOV AX,DS NOP is replaced
at runtime with a MOV AX,VALUE, but I can't figure the INC BP.