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

On Thu, Nov 29, 2001 at 07:42:51PM -0500, Elena Zannoni wrote:
> Kevin Buettner writes:
>  > On Nov 29,  6:03pm, Andrew Cagney wrote:
>  > 
>  > > >> Unfortunately not. I thought the same, until I remembered about core
>  > > >  > > file debugging. That function is called by fetch_core_registers() in
>  > > >  > > core-aout.c.
>  > > >  > > Hmm... I wonder if Linux/PPC even needs this function in core-aout.c.
>  > > >  > Daniel J. is the expert on this stuff.  Daniel, doesn't Linux/PPC use
>  > > >  > core-regset.c instead?
>  > > >  > Whoops, yes, you are right. False alarm.
>  > > 
>  > > So just the core code needs to have a hard-wired (non native header) way 
>  > > of unpacking Altivec registers (if they are found?)?
>  > 
>  > I'm guessing we'll end up having to add fetch_core_registers() and
>  > company to ppc-linux-nat.c.  That way neither core-regset.c nor
>  > core-aout.c will be used for a native Linux/PPC build.  (See
>  > fetch_core_registers() in i386-linux-nat.c as an example.)
> cross core file support: is that a concern?

For me, at least, it is.  I should take this as motivation and finish
the cross core patches.  I'm a little behind on them.

> Side bar: there is something interesting about the way the corelow.c
> file gets the registers sections from a core file. It looks for .reg
> (gregs), .reg2 (fpregs), and .reg-xfp (extended-floating point x86
> only(?)). Seems like I'll have to add a fetch section call for a
> .reg-altivec (or whatever it will be called, it's not produced
> yet). But that's in common code.  I don't like it. This
> get_core_registers() will have to be overwritten too, maybe.

I'd rather make it support fetching arbitrary sections.  I have the
design for this in mind already; I'll get back to you on it as soon as
I can (probably next week).

Daniel Jacobowitz                           Carnegie Mellon University
MontaVista Software                         Debian GNU/Linux Developer

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