From: Ralf Baechle <ralf@oss.sgi.com>
To: Carsten Langgaard <carstenl@mips.com>
Cc: linux-mips@oss.sgi.com
Subject: Re: an old FPU context corruption problem when signal happens
Date: Tue, 25 Dec 2001 04:51:34 -0200 [thread overview]
Message-ID: <20011225045134.A17007@dea.linux-mips.net> (raw)
In-Reply-To: <20011225044125.A16759@dea.linux-mips.net>; from ralf@oss.sgi.com on Tue, Dec 25, 2001 at 04:41:25AM -0200
On Tue, Dec 25, 2001 at 04:41:25AM -0200, Ralf Baechle wrote:
> > Are you sure this hasn't been fix in the latest sources (2.4.16) ?
> > I have send a patch to Ralf, which I believe solves a similar problem as
> > you describe below.
> >
> > Ralf have you applied the patch ?
>
> Well, I applied it but it's really broken as something can be. Just an
> example:
>
> + /*
> + * FPU emulator may have it's own trampoline active just
> + * above the user stack, 16-bytes before the next lowest
> + * 16 byte boundary. Try to avoid trashing it.
> + */
> + sp -= 32;
>
> So the whole thing needs some overhaul.
Btw, the whole fp trampoline thing will have to die anyway. Virtually
indexed i-caches on some new types of SMP are making them even more
expensive then they already are.
Ralf
next prev parent reply other threads:[~2001-12-26 21:43 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-12-20 1:04 an old FPU context corruption problem when signal happens Jun Sun
2001-12-20 7:58 ` Carsten Langgaard
2001-12-20 17:16 ` Jun Sun
2001-12-25 6:41 ` Ralf Baechle
2001-12-25 6:51 ` Ralf Baechle [this message]
2001-12-27 10:53 ` Carsten Langgaard
2002-01-02 4:34 ` Ralf Baechle
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