[RFC PATCH v5 2/2] ARM: VFP: preserve the HW context when calling signal handlers

[Russell King - ARM Linux]

On Fri, Apr 02, 2010 at 05:36:03PM +0300, imre.deak at nokia.com wrote:
> From: Imre Deak <imre.deak at nokia.com>
> 
> Signal handlers can use floating point, so prevent them to corrupt
> the main thread's VFP context. So far there were two signal stack
> frame formats defined based on the VFP implementation, but the user
> struct used for ptrace covers all posibilities, so use it for the
> signal stack too.
> 
> Introduce also a new user struct for VFP exception registers. In
> this too fields not relevant to the current VFP architecture are
> ignored.
> 
> Support to save / restore the exception registers was added by
> Will Deacon.

Look fine to me, but I'd like an ack from Daniel since he partly looks
after the toolchain side of things and has dealt with this area before.