On Wed, 30 Jun 2010, David VomLehn wrote:
> > How about something like:
> >
> > {
> > long x;
> > ...
> > asm("move %0,$29":"=g"(x));
> > ...
> > }
>
> Depending on the version of gcc you are using, you should also be able
> to use __builtin_frame_address(), though I haven't tried this in the kernel.
It works just fine with a zero argument; the usual restrictions apply to
non-zero arguments. Or alternatively an explicit register variable will
do as suggested by Ralf. Both approaches result in a bit better code than
an explicit move; the former is portable to other platforms even. :)
Maciej
