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Re: [Xen-devel] [PATCH] x86 emulation: fix bswap
| To: | "Keir Fraser" <Keir.Fraser@xxxxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] [PATCH] x86 emulation: fix bswap |
| From: | "Jan Beulich" <jbeulich@xxxxxxxxxx> |
| Date: | Thu, 15 Feb 2007 11:37:05 +0000 |
| Cc: | xen-devel@xxxxxxxxxxxxxxxxxxx |
| Delivery-date: | Thu, 15 Feb 2007 03:35:06 -0800 |
| Envelope-to: | www-data@xxxxxxxxxxxxxxxxxx |
| In-reply-to: | <C1F9E768.9744%Keir.Fraser@xxxxxxxxxxxx> |
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| References: | <45D4427E.76E4.0078.0@xxxxxxxxxx> <C1F9E768.9744%Keir.Fraser@xxxxxxxxxxxx> |
| Sender: | xen-devel-bounces@xxxxxxxxxxxxxxxxxxx |
>>> Keir Fraser <Keir.Fraser@xxxxxxxxxxxx> 15.02.07 11:33 >>> >On 15/2/07 10:22, "Jan Beulich" <jbeulich@xxxxxxxxxx> 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 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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