[Xen-devel] Re: [patch 12/26] Xen-paravirt_ops: Fix patch site clobbers to include return register

[Zachary Amsden <zach@xxxxxxxxxx>]

Jeremy Fitzhardinge wrote:
> Zachary Amsden wrote:
>   
> > > Things like what?  Do you mean the %[foo] asm parameter syntax?  I think
> > > those versions are no longer supported - Arjan posted a patch a few days
> > > ago to convert a pile of asms to this form.  Or do you mean something
> > > else?
> > >   
> > >       
> > I meant having an output in the clobber list,
> >     
> There's no output in the clobber list, just "memory" and "cc".  The
> paravirt_clobber() is the stuff which gets put in the .parainstructions
> section which tells the patcher what registers are expected to be
> modified at that callsite (including both temp and output registers).
>   
Ah, ok.  I didn't think gcc had grown the appropriate antlers yet to 
allow outputs in the clobber list.  But the paravirt-clobbers, yes that 
makes sense.
Zach

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