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

["Xu, Anthony" <anthony.xu@xxxxxxxxx>]

>From: Tristan Gingold [mailto:Tristan.Gingold@xxxxxxxx]
>Sent: 2006年4月26日 16:59
>To: Xu, Anthony; xen-ia64-devel@xxxxxxxxxxxxxxxxxxx
>Subject: Re: [Xen-ia64-devel] [PATCH] emulate ldfp8 in mmio
>
>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.
Sure


>Tristan.

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