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Re: [RFA] W.I.P. AltiVec ppc registers support.
On Thu, Nov 29, 2001 at 12:04:22PM -0500, Andrew Cagney wrote:
> >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?
It would be (somewhat trivial, but) OK, yes. I have nothing against
the implementation, just the interface.
Daniel Jacobowitz Carnegie Mellon University
MontaVista Software Debian GNU/Linux Developer