Re: Use of r31 on the powerpc/booke:mpc85xx architecture

[Matt Thomas <matt%3am-software.com@localhost>]

On Sep 7, 2012, at 9:59 AM, Scislowicz, Adam wrote:

> My mistake, the last set of listed registers is in this case a list of 
> registers implicitly clobbered by the inline assembly. If I understand 
> correctly this pmap_copy_page() function is incompatible with preservation of 
> the frame pointer. Perhaps falling back on a non-optimized pmap_copy_page() 
> when DDB is enabled is the right course of action excepting an alternative 
> optimized implementation which preserves r31.

I've tweaked pmap_copy_page so that gcc is not aware of the use of r31.