Re: [Xen-devel] x86_emulate(): Upon LOCK prefix for MOV, should inject #UD rather than #GP?

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

Strictly speaking we don't actually generate exceptions yet. We return
X86EMUL_UNHANDLEABLE to the caller, and they will often inject #UD as a
result. But yes, it really should be EXC_UD.

 -- Keir


On 20/12/07 02:58, "Liu, Eric E" <eric.e.liu@xxxxxxxxx> wrote:

> Hi all,
> The Intel SDM(2A) says that if the LOCK prefix is used with some
> instructions such as "mov" and the souce  operand is a memory operand, a
> #UD may be generated, but in the x86_emulate.c there are places such as
> :
>     942     /* Lock prefix is allowed only on RMW instructions.
> */
>     943     generate_exception_if((d & Mov) && lock_prefix,
> EXC_GP);
> here we inject EXC_GP but not EXC_UD, is it a bug?
> 
> --Eric (Liu, Feng)
> 
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> http://lists.xensource.com/xen-devel



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