Re: A89: More ASM help please

To: assembly-89@lists.ticalc.org
Subject: Re: A89: More ASM help please
From: Xavier VASSOR - The Doors Team <doors@altern.org>
Date: Thu, 26 Nov 1998 20:04:20 +0100
Delivered-To: assembly-89-outgoing@towerguard.unix.edu.sollentuna.se
In-Reply-To: <c65c17f8.365b8523@aol.com>
Reply-To: assembly-89@lists.ticalc.org



>>  
>>      move.l   a0,-(a7)
>>  
>>  <<< String is being pushed into the stack via a0, but why did we have to
>use
>>  a0 when it seems logical enough to just push string in directly?>>>

Indeed he could have done:
	pea	string(pc)
instead of:
	lea	string(pc),a0
	move.l	a0,-(a7)

pea is the instruction which pushes on the stack an effective adress. here
the effective adress is: string(PC) + offset of 'string' relative to PC -->
this is an absolute adress.


Xavier VASSOR
---The Doors Team
E-mail:xvassor@mail.dotcom.fr
Doors Homepage: http://www.altern.org/doors
ICQ:10241721

References:

Re: A89: More ASM help please

From: Daniel7073@aol.com