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Re: Illegal instruction - a workaround or fix ?

To: "Maciej W. Rozycki" <macro@ds2.pg.gda.pl>
Subject: Re: Illegal instruction - a workaround or fix ?
From: Ralf Baechle <ralf@oss.sgi.com>
Date: Mon, 30 Apr 2001 17:24:19 -0300
Cc: Florian Lohoff <flo@rfc822.org>, Pete Popov <ppopov@mvista.com>, linux-mips@oss.sgi.com
In-reply-to: <Pine.GSO.3.96.1010430113243.889B-100000@delta.ds2.pg.gda.pl>; from macro@ds2.pg.gda.pl on Mon, Apr 30, 2001 at 11:34:32AM +0200
References: <20010420215841.D15990@paradigm.rfc822.org> <Pine.GSO.3.96.1010430113243.889B-100000@delta.ds2.pg.gda.pl>
Sender: owner-linux-mips@oss.sgi.com
User-agent: Mutt/1.2.5i
On Mon, Apr 30, 2001 at 11:34:32AM +0200, Maciej W. Rozycki wrote:

> > A different solution would be to take the usual exit in sysmips via
> > the return at the end (for which the compiler generated a correct
> > epilogue) and modify the return address - This is an very ugly hack
> > and you cant tell where the compiler stores the ra on the stack.
> 
>  It could be doable with __builtin_frame_address().  Haven't investigated
> it further, though. 

MIPS ABI doesn't define that ra gets stored at a constant offset in
the stackframe, so that won't work.

  Ralf

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