[RFC PATCH v5 0/2] ARM: VFP: Save / restore VFP state on the signal handler path

[Nicolas Pitre]

On Tue, 13 Apr 2010, Imre Deak wrote:

> On Tue, Apr 13, 2010 at 12:04:40AM +0200, ext Jamie Lokier wrote:
> > imre.deak at nokia.com wrote:
> > > From: Imre Deak <imre.deak at nokia.com>
> > > 
> > > Changes since v4:
> > > - Do not add the packed attribute to user_vfp or user_vfp_exc.
> > >   I added packed to these structs to prevent the extra padding in
> > >   vfp_sigframe. But actually the padding is in accordance with the
> > >   ARM ABI.
> > 
> > EABI, OABI or both?
> 
> I checked only EABI, which specifies alignment to the struct's alignment,
> which is 8 bytes for struct user_vfp.
> 
> I haven't found an official OABI spec, but some googling turned up
> that there the requirement is only to align to word size, so we'd
> have a difference in the struct vfp_sigframe's size and the alignment
> of the user_vfp_exc within.

I think that VFP is defined for EABI only anyway.  I doubt people are 
using VFP with OABI in practice either.


Nicolas