linux-kernel - Re: [PATCH v1 1/8] tools/nolibc: add support for powerpc

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Date:   Tue, 25 Jul 2023 14:14:11 +0800
From:   Zhangjin Wu <falcon@...ylab.org>
To:     thomas@...ch.de
Cc:     arnd@...db.de, falcon@...ylab.org, linux-kernel@...r.kernel.org,
        linux-kselftest@...r.kernel.org, w@....eu
Subject: Re: [PATCH v1 1/8] tools/nolibc: add support for powerpc

Hi, Thomas

> 
> On 2023-07-19 05:10:48+0800, Zhangjin Wu wrote:
> > Both syscall declarations and _start code definition are added for
> > powerpc to nolibc.
> > 
[...]
> > 
> > Signed-off-by: Zhangjin Wu <falcon@...ylab.org>
> > ---
> >  tools/include/nolibc/arch-powerpc.h | 156 ++++++++++++++++++++++++++++
> 
> This also should be added to nolibc/arch.h.
>

Thanks, it should be.

> >  1 file changed, 156 insertions(+)
> >  create mode 100644 tools/include/nolibc/arch-powerpc.h
> > 
> > diff --git a/tools/include/nolibc/arch-powerpc.h b/tools/include/nolibc/arch-powerpc.h
> > new file mode 100644
> > index 000000000000..100ec0f412dc
> > --- /dev/null
> > +++ b/tools/include/nolibc/arch-powerpc.h
> > @@ -0,0 +1,156 @@
> > +/* SPDX-License-Identifier: LGPL-2.1 OR MIT */
> > +/*
> > + * PowerPC specific definitions for NOLIBC
> > + * Copyright (C) 2023 Zhangjin Wu <falcon@...ylab.org>
> 
> If it is taken from musl, shouldn't there also be a musl copyright?
>

For this copyright issue, I have prepared two new versions without a line from
musl. even in our old version, most of them are different except the 'sc; bns+
1f; neg %1, %1; 1:' line and the register variables.

Seems 'sc; bns+ 1f; neg %1, %1; 1:' is also used in linux kernel:
arch/powerpc/include/asm/vdso/gettimeofday.h, so, it should be ok enough to
apply it.

The register varibles have been changed and aligned with othe arch-<ARCH>.h
locally, they are completely different now, and even further with the new
syscall.h mentioned in this reply [1], the file will be completely different.

Thomas, Have added your Reviewed-by lines too, thanks a lot!

Best regards,
Zhangjin
----
[1]: https://lore.kernel.org/lkml/20230725054414.15055-1-falcon@tinylab.org/