From: "Eric Ries" <eries@there.com>
To: "Alan Cox" <alan@lxorguk.ukuu.org.uk>
Cc: <linux-kernel@vger.kernel.org>
Subject: RE: FPU precision & signal handlers (bug?)
Date: Mon, 4 Mar 2002 15:31:26 -0800 [thread overview]
Message-ID: <KPEDLFEJBNHDLFEEOIIMCELKCEAA.eries@there.com> (raw)
In-Reply-To: <E16i15h-0000q9-00@the-village.bc.nu>
> -----Original Message-----
> From: Alan Cox [mailto:alan@lxorguk.ukuu.org.uk]
> Sent: Monday, March 04, 2002 2:38 PM
> To: Eric Ries
> Cc: linux-kernel@vger.kernel.org
> Subject: Re: FPU precision & signal handlers (bug?)
>
>
> Think about MMX and hopefully it makes sense then.
Yes, I think I understand why this is the case presently.
> > strikes me as kind of a hack. Why should the signal handler, alone
> > among all my functions (excepting main) be responsible for blowing
> > away the control word?
>
> Right - I would expect it to be restored at the end of the signal handler
> for you - is that occuring or not ? I just want to make sure I understand
> the precise details of the problem here.
Yes, my belief is that the kernel undoes the FINIT changes by restoring the
FPU state after the signal handler returns.
Eric
next prev parent reply other threads:[~2002-03-04 23:32 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-03-04 18:58 FPU precision & signal handlers (bug?) Eric Ries
2002-03-04 22:37 ` Alan Cox
2002-03-04 23:31 ` Eric Ries [this message]
2002-03-05 18:23 ` Gabriel Paubert
2002-03-06 0:06 ` Alan Cox
2002-03-07 17:31 ` Gabriel Paubert
2002-03-07 19:25 ` Alan Cox
2002-03-08 12:11 ` Gabriel Paubert
2002-03-06 19:11 ` Gabriel Paubert
2002-03-06 23:32 ` Eric Ries
2002-03-08 11:54 ` Gabriel Paubert
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