[RFA] W.I.P. AltiVec ppc registers support.

[Andrew Cagney]

> 
> Wait, I knew I was forgetting something important.
> 
> There is no kernel support for this feature in any public PowerPC
> kernel tree, and to my knowledge there has been no suggested patch for
> it on any of the public LinuxPPC forums.  As such, the interface to it
> is still up in the air.  I've discussed this with other kernel folk at
> various times, and the general consensus is that, instead of adding
> them to the user area and using PEEKUSR, someone should simply
> implement PTRACE_GETFPXREGS (perhaps just PTRACE_GETXREGS, as the FP
> does not really apply, but consistency...).  We almost never want to
> fetch just one altivec register, excepting maybe VRSAVE, and GETFPXREGS
> takes negligibly more time than a single PEEKUSR call.

So if the tweek to ppc-linux-nat.c that does the register fetch was 
omitted, it would be ok?

Andrew