Re: [Xen-ia64-devel] [PATCH] emulate ldfp8 in mmio

[Tristan Gingold <Tristan.Gingold@xxxxxxxx>]

Le Mercredi 26 Avril 2006 10:39, Xu, Anthony a écrit :
> From: Tristan Gingold
>
> >Sent: 2006年4月26日 16:32
> >To: Xu, Anthony; xen-ia64-devel@xxxxxxxxxxxxxxxxxxx
> >Subject: Re: [Xen-ia64-devel] [PATCH] emulate ldfp8 in mmio
> >
> >Le Mardi 25 Avril 2006 07:30, Xu, Anthony a écrit :
> >> 1. emulate ldpf8 in mmio
> >> 2. handle floating point register rotation in functions setfpreg and
> >> getfpreg
> >
> >Just a late comment:
> >
> >writes to f0/f1 are not correctly handled.  A fault must be reflected to
> > user.
>
> From intuition, it's a bug,
>
> After studying ldfp instruction further, this maybe not a bug,
> Before reading memory, processor will check target fp register, if the
> target fp register is f0 or f1, a fault happens.
Good point.

So we could remove case 0 and case 1 in setfpreg because this generates a 
warning.

Tristan.



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