Re: A92: PLEASE ! > HELP ! Interrupt & stack ! PLEH <

To: assembly-92@lists.ticalc.org
Subject: Re: A92: PLEASE ! > HELP ! Interrupt & stack ! PLEH <
From: David Ellsworth <davidell@ix.netcom.com>
Date: Wed, 28 Jan 1998 13:36:46 -0800
In-Reply-To: <01BD2C2A.F7930D20@rou6-237.abo.wanadoo.fr>
Reply-To: assembly-92@lists.ticalc.org


At 08:25 PM 1/28/98 +0100, Famille SCHERRER wrote:
<< I have an other question... Is the CCR register destroyed by the
interrupt routine ? Because If it break the program just after a 'cmp', it
could crash the program. If it is destroyed, how could I do to save it and
then restore it, since the 'move from CCR' doesn't work on the 68000. >>

Yes, the SR register (which contains CCR in its low byte) is saved when an
exception occurs, and is restored by RTE. The exception stack frame
consists of 0(sp)=saved SR (word), and 2(sp)=return address (longword).

---
David Ellsworth
davidell@earthling.net
IRC: eXocomp
ICQ: 2300673

References:

Re: A92: PLEASE ! > HELP ! Interrupt & stack ! PLEH <

From: Famille SCHERRER <p.c.Scherrer@wanadoo.fr>

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