From: "Jan Beulich" <jbeulich@novell.com>
To: Keir Fraser <Keir.Fraser@cl.cam.ac.uk>
Cc: xen-devel@lists.xensource.com
Subject: Re: [PATCH] x86 emulation: fix bswap
Date: Thu, 15 Feb 2007 11:37:05 +0000 [thread overview]
Message-ID: <45D453F1.76E4.0078.0@novell.com> (raw)
In-Reply-To: <C1F9E768.9744%Keir.Fraser@cl.cam.ac.uk>
>>> Keir Fraser <Keir.Fraser@cl.cam.ac.uk> 15.02.07 11:33 >>>
>On 15/2/07 10:22, "Jan Beulich" <jbeulich@novell.com> wrote:
>
>> REX.R needs to be decoded and since bswap on a 16-bit operand is undefined,
>> it is best to have hardware execute this so the emulation result matches
>> hardware behavior. Since it is simple to do, faster, and smaller, also let
>> hardware do 32- and 64-bit ones.
>
>Can 'undefined' behaviour include e.g. #UD?
I don't think so.
Jan
next prev parent reply other threads:[~2007-02-15 11:37 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-02-15 10:22 [PATCH] x86 emulation: fix bswap Jan Beulich
2007-02-15 10:33 ` Keir Fraser
2007-02-15 11:37 ` Jan Beulich [this message]
2007-02-15 11:46 ` Petersson, Mats
2007-02-15 11:54 ` Keir Fraser
2007-02-15 12:12 ` Petersson, Mats
2007-02-16 7:32 ` Error with vfb Xen 3.0.4 Kaushik Barde
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