Path: utzoo!utgpu!attcan!uunet!mcvax!enea!tut!santra!jmunkki
From: jmunkki@santra.HUT.FI (Juri Munkki)
Newsgroups: comp.sys.mac.programmer
Subject: Re: Register saving conventions
Message-ID: <15055@santra.UUCP>
Date: 6 Aug 88 12:41:36 GMT
References: <664@iraun1.ira.uka.de> <1133@lzsc.ATT.COM>
Sender: jmunkki@santra.UUCP
Reply-To: jmunkki@santra.UUCP (Juri Munkki)
Organization: Helsinki University of Technology, Finland
Lines: 20

In article <1133@lzsc.ATT.COM> mkg@lzsc.ATT.COM (Marsh Gosnell) writes:
>When I patch traps I make it a point to save/restore everything (D0-D7/A0-A4).
>No telling what assumptions the ROM makes or, worse yet, what assumptions
>some other programmer who patches the same trap as you made (or forgot to).
>  Marsh Gosnell

Ithink we should program according to apple documentation. Since register-
saving is one of the most time-consuming things that can be done on a 68000,
it should avoided when possible.

Maybe someone could write a "register scramble" function for TMON. It would
trash any registers that can be theoretically trashed when a trap is called.
All apple code _should_ be able to survive this mode (probably wouldn't at
first).

Juri Munkki
jmunkki@santra.hut.fi
jmunkki@fingate.bitnet

P.S. When is there going to be a 020 and 881 compatible TMON??