[PATCH] ARM: make head.S register assignments more convenient

[dave.martin@linaro.org (Dave Martin)]

On Tue, Dec 06, 2011 at 02:01:23PM -0500, Nicolas Pitre wrote:
> On Tue, 6 Dec 2011, Dave Martin wrote:
> 
> > On Tue, Dec 06, 2011 at 11:29:12AM +0000, Russell King - ARM Linux wrote:
> > > On Tue, Dec 06, 2011 at 11:11:05AM +0000, Dave Martin wrote:
> > > > Is it also worth changing the other proc-*.S setup rountines to be PCS
> > > > compliant too?  This would clean up the calling convention further, and
> > > > help avoid future sutprises.
> > > 
> > > They _aren't_ PCS functions in any case.  They don't have a stack
> > > available to them.  So, having them as non-PCS functions reinforces
> > > the fact that they _are_ special.
> > 
> > Fair point.
> > 
> > Maybe a brief note in the commit message explaining why only certain
> > proc-*.S files are touched would be belpful.  But it's not vital.
> 
> They are touched only because they were using registers where I moved 
> the previous r1 and r2 values to.  So I moved their usage of mainly 
> r5-r6 to the normally callee clobbered registers.  I don't think there 
> is further changes that would be as badly needed as those I did.

Fair enough
---Dave