[PATCH] arc: Add support for ARC HS extra registers in core files

[Claudiu Zissulescu Ianculescu]

Thank you for the clarification. It looks all right from my side.

Nick, am I allowed to push Shahab's patch? It does touches some generic files.

Thanks,
Claudiu

On Mon, Apr 6, 2020 at 12:06 PM Shahab Vahedi <shahab.vahedi@gmail.com> wrote:
>
> Hi Claudiu,
>
> > >
> > > Hi Shahab,
> > >
> > > I don't really like the ARC_V2 name. All ARC variants can have extra registers
> > > from r32 to r59 called extension core registers :) I would go for something more
> > > generic like ARC_EXT_REG, or something like that
> > >
>
> I have looked into this a little bit further:
>
> As Anton mentioned, since NT_ARC_V2 is entangled with kernel's ptrace, it is
> not a not a viable option to change it.
>
> Regarding the ".reg-arc-v2" section, there can be 3 registers in there: r30,
> r58, and r59. The r58/r59 pair are the accumulator registers. r30 is the tricky
> one. In ARCompact (ARC 600/700), r30 used to be called ILINK2 and was not a
> userspace register. In ARCv2, that has changed. It is considered a general
> purpose register, hence its inclusion in ".reg-arc-v2". I am afraid that the
> name of this note indeed reflects how tied it is to ARCv2.
>
>
> Cheers,
> Shahab