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xen-ia64-devel
RE: [Xen-ia64-devel] [PATCH] emulate ldfp8 in mmio
>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.
Thanks,
Anthony
>Tristan.
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