Path: utzoo!attcan!uunet!cbmvax!rutgers!tut.cis.ohio-state.edu!osu-cis!killer!texbell!tness1!uhnix1!uhnix2!uace0
From: uace0@uhnix2.uh.edu (Michael B. Vederman)
Newsgroups: comp.sys.atari.st
Subject: Re: Interrupts, Interrupts, Interrupts.
Summary: Save, Save, Save
Message-ID: <688@uhnix2.uh.edu>
Date: 18 Oct 88 23:44:55 GMT
References: <8810181052.AA28587@ucbvax.Berkeley.EDU>
Reply-To: uace0@uhnix2.UUCP
Organization: University of Houston
Lines: 30

First of all, you must do something like this:

move.w sr,-(a7)
ori.w  #700,sr
(your code)
move.w (a7)+,sr

In actuality, you should probably do something like:

move.w  sr,-(a7)
ori.w   #700,sr
movem.l d0-d7/a0-a5,-(a7)
(your code)
movem.l (a7)+,d0-d7/a0-a5
move.w  (a7)+,sr

To protect any possible register changes.  I would also be sure you are not
screwing up the stack pointer which almost sounds possible.  You should not
mess with the status register except by oring it to mask out interrupts, but
mostly you must restore its previous value.  You might also need to check
whether you are in super or user mode when you enter your code, so you know
which stack to use...

- mike vederman

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