Re: [Xen-devel] [PATCH VERY RFC 3/5] tools/fuzz: introduce x86 instruction emulator target

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Thu, Dec 08, 2016 at 08:03:04AM -0700, Jan Beulich wrote:
[...]
> 
> > +static int emul_read_cr(
> > +    unsigned int reg,
> > +    unsigned long *val,
> > +    struct x86_emulate_ctxt *ctxt)
> > +{
> > +    /* Fake just enough state for the emulator's _get_fpu() to be happy. */
> > +    switch ( reg )
> > +    {
> > +    case 0:
> > +        *val = 0x00000001; /* PE */
> > +        return X86EMUL_OKAY;
> > +
> > +    case 4:
> > +        /* OSFXSR, OSXMMEXCPT, and maybe OSXSAVE */
> > +        *val = 0x00000600 | (cpu_has_xsave ? 0x00040000 : 0);
> > +        return X86EMUL_OKAY;
> > +    }
> > +
> > +    return X86EMUL_UNHANDLEABLE;
> > +}
> 
> Looks suspiciously similar to existing code. We may want to share
> such stuff, to avoid having to update it in multiple places.
> 

Share with what? Do you mean the real emulator code?

Wei.

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