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From: Pedro Alves <pedro@codesourcery.com>
To: "H.J. Lu" <hjl.tools@gmail.com>
Subject: Re: PATCH: gdbserver: Clear regcache if buf is NULL
Date: Sat, 16 Oct 2010 20:01:00 -0000
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References: <20100203174414.GA29948@lucon.org> <201009282123.29913.pedro@codesourcery.com> <AANLkTim6oLv-WqasLRfxG=tf3QVFj=hP=Nn1U0KGovcm@mail.gmail.com>
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On Friday 01 October 2010 02:51:07, H.J. Lu wrote:
> On Tue, Sep 28, 2010 at 1:23 PM, Pedro Alves <pedro@codesourcery.com> wrote:

> > Hi H.J..  I'm looking at where in the current sources this
> > ended up being used, and not finding it.  Am I right in thinking
> > that the need for this was obsoleted when you later tought
> > gdbserver x86-linux about xml descriptions?
> >
> 
> i387-fp.c has
> 
>   if ((x86_xcr0 & I386_XSTATE_SSE))
>     {
>       int xmm0_regnum = find_regno ("xmm0");
> 
>       if ((clear_bv & I386_XSTATE_SSE))
>         p = NULL;
>       else
>         p = (char *) buf;
> 
>       for (i = 0; i < num_xmm_registers; i++)
>         {
>           if (p)
>             p = ((char *) &fp->xmm_space[0]) + i * 16;
>           supply_register (regcache, i + xmm0_regnum, p);
>         }
>     }
> 

Thanks, and sorry as for not coming back to this promptly.
Hmm, I don't think I have a way to trigger that.
So is the registers' value really zero, or should gdb
ideally present them as not available (and zero is just a
hack)?

-- 
Pedro Alves