From: Ralf Baechle <ralf@linux-mips.org>
To: "Kevin D. Kissell" <kevink@paralogos.com>
Cc: Shane McDonald <mcdonald.shane@gmail.com>,
linux-mips@linux-mips.org, Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Subject: Re: [MIPS] FPU emulator: allow Cause bits of FCSR to be writeable by ctc1
Date: Wed, 5 May 2010 10:11:59 +0100 [thread overview]
Message-ID: <20100505091159.GA4016@linux-mips.org> (raw)
In-Reply-To: <4BE122D1.3000609@paralogos.com>
On Wed, May 05, 2010 at 12:48:33AM -0700, Kevin D. Kissell wrote:
> I'm glad to hear that the patch is functional. It was pretty clear that
> it would solve your problem, but I was concerned that the inability to
> write the Cause bits was done as a way around some other problem.
> Someone went to a certain amount of trouble to not accept them as
> inputs, in violation of spec. I just looked back, and the bug was
> introduced as part of a patch of Ralf's from April 2005 entitled "Fix
> Preemption and SMP problems in the FP emulator". It's unlikely that
> overriding CTC semantics actually fixed any underlying problems, but it
> may have masked symptoms of problems that we can only hope have been
> fixed in the mean time. Anyone run this patch on an FPUless SMP? Oh,
> for a 34Kf with a bunch of TCs! ;o)
That's commit ID 72402ec9efdb2ea7e0ec6223cf20e7301a57da02 and the patch
was comitted during the CVS days which only records the comitter but not
the author. The actual author is Atsushi Nemoto.
Ralf
next prev parent reply other threads:[~2010-05-05 9:12 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-05-05 4:02 [MIPS] FPU emulator: allow Cause bits of FCSR to be writeable by ctc1 Shane McDonald
2010-05-05 7:48 ` Kevin D. Kissell
2010-05-05 9:11 ` Ralf Baechle [this message]
2010-05-05 15:43 ` Kevin D. Kissell
2010-05-05 16:22 ` Atsushi Nemoto
2010-05-05 19:20 ` Kevin D. Kissell
2010-05-06 11:24 ` Sergei Shtylyov
2010-05-06 15:46 ` Kevin D. Kissell
[not found] ` <o2yb2b2f2321005061142v431dbc78n2a21722676a72501@mail.gmail.com>
2010-05-06 18:47 ` Ralf Baechle
2010-05-06 19:06 ` Kevin D. Kissell
2010-05-08 16:46 ` Atsushi Nemoto
2010-05-06 9:01 ` Ralf Baechle
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