sparc64 support for Solaris

[Joe Buck]

> > Solaris 2.5.x does not save the 64-bit register state, so basically some
> > registers will come back randomized (from other processes?).
> 
> hmm...
> are you sure ?
> Solaris2.5.1 ultra != solaris 2.5.1 32bit sparc.

I am quite certain.

> > Solaris 2.6 is supposed to fix this.  
> 
> no
> 64bit interface will be in Solaris 2.7, Q1 next year i've heard

I was told "fixed in 2.6" by Sun people over a year ago.  Possibly
it slipped.