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Re: [Xen-devel] [PATCH] x86 emulation: fix bswap
| To: | Jan Beulich <jbeulich@xxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] [PATCH] x86 emulation: fix bswap |
| From: | Keir Fraser <Keir.Fraser@xxxxxxxxxxxx> |
| Date: | Thu, 15 Feb 2007 10:33:12 +0000 |
| Delivery-date: | Thu, 15 Feb 2007 02:32:56 -0800 |
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| Thread-index: | AcdQ7LFF74/AALzfEdu/0gAX8io7RQ== |
| Thread-topic: | [Xen-devel] [PATCH] x86 emulation: fix bswap |
| User-agent: | Microsoft-Entourage/11.2.5.060620 |
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? -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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