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References: <20210917035736.3934017-1-chenhuacai@loongson.cn>
 <20210917035736.3934017-2-chenhuacai@loongson.cn> <20210923203705.GA1936@bug>
In-Reply-To: <20210923203705.GA1936@bug>
From:   Huacai Chen <chenhuacai@gmail.com>
Date:   Fri, 24 Sep 2021 12:07:56 +0800
Message-ID: <CAAhV-H4=Fdsut8c+Zs3RmR9p=_4pNeYb7Bw-JA51UwV7SF9GgA@mail.gmail.com>
Subject: Re: [PATCH V3 01/22] Documentation: LoongArch: Add basic documentations
To:     Pavel Machek <pavel@ucw.cz>
Cc:     Huacai Chen <chenhuacai@loongson.cn>,
        Arnd Bergmann <arnd@arndb.de>,
        Andy Lutomirski <luto@kernel.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Peter Zijlstra <peterz@infradead.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        David Airlie <airlied@linux.ie>,
        Jonathan Corbet <corbet@lwn.net>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        linux-arch <linux-arch@vger.kernel.org>,
        "open list:DOCUMENTATION" <linux-doc@vger.kernel.org>,
        LKML <linux-kernel@vger.kernel.org>,
        Xuefeng Li <lixuefeng@loongson.cn>,
        Yanteng Si <siyanteng@loongson.cn>,
        Jiaxun Yang <jiaxun.yang@flygoat.com>
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Hi, Pavel,

On Fri, Sep 24, 2021 at 4:37 AM Pavel Machek <pavel@ucw.cz> wrote:
>
> Hi!
>
> > Add some basic documentations for LoongArch. LoongArch is a new RISC
>
> ... documentation ...
OK, thanks.

>
> > +wide in LA64. $r0 is always zero, and other registers has no special feature,
>
> ...have no special features...
OK, thanks.

>
> > +but we actually have an ABI register conversion as below.
>
> convention?
Yes, should be convention here.

>
> > +``$r21``          ``$x``          Reserved            Unused
> > +``$r22``          ``$fp``         Frame pointer       Yes
> > +``$r23``-``$r31`` ``$s0``-``$s8`` Static registers    Yes
> > +================= =============== =================== ============
>
> Not sure I know the term 'static registers' before.
"Static register" comes from the MIPS code "SAVE_STATIC", maybe it is
called "Saved register" in other places, but I think "static register"
is also OK.

Huacai
>                                                                 Pavel