From: "John Breen" <jab3@hotmail.com>
To: egcs@cygnus.com
Subject: Re: Interrupt handler attribute for m68k
Date: Wed, 16 Dec 1998 10:16:00 -0000 [thread overview]
Message-ID: <19981216181640.27895.qmail@hotmail.com> (raw)
From: Jeffrey A Law <law@hurl.cygnus.com>
> > [...] Which one would be the best to use as a model?
>Not sure. Probably whichever port has code which most closely
>matches the m68k's prologue/epilogue code.
Maybe I'm being naive about this. From what I've been told, people
currently use a wrapper like this for interrupts on m68k:
movem.l %d0-%d1/%a0-%a1,-(%sp)
jsr c_function
movem.l (%sp)+,%d0-%d1/%a0-%a1
rte
My plan was simply to have the prologue code save these registers also
if it's an interrupt handler, and the epilogue restore them and do an
rte instead of an rts. The rest of the prologue/epilogue code would
stay the same.
If it takes much more than that, then I'm probably in over my head.
--
John A. Breen
jab3@hotmail.com
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next reply other threads:[~1998-12-16 10:16 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
1998-12-16 10:16 John Breen [this message]
-- strict thread matches above, loose matches on Subject: below --
1998-12-15 14:28 Mike Stump
1998-12-15 14:31 ` Jeffrey A Law
1998-12-15 13:43 John Breen
1998-12-15 13:58 ` Jeffrey A Law
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