linux-kernel - Re: [PATCH 1/2] tools/nolibc: x86: Remove `r8`, `r9` and `r10` from the clobber list

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Message-ID: <20211018055236.GA15718@1wt.eu>
Date:   Mon, 18 Oct 2021 07:52:36 +0200
From:   Willy Tarreau <w@....eu>
To:     Ammar Faizi <ammar.faizi@...dents.amikom.ac.id>
Cc:     Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Andy Lutomirski <luto@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>,
        David Laight <David.Laight@...LAB.COM>,
        Peter Cordes <peter@...des.ca>,
        Bedirhan KURT <windowz414@...weeb.org>,
        Louvian Lyndal <louvianlyndal@...il.com>,
        Borislav Petkov <bp@...en8.de>
Subject: Re: [PATCH 1/2] tools/nolibc: x86: Remove `r8`, `r9` and `r10` from
 the clobber list

On Fri, Oct 15, 2021 at 03:25:06PM +0700, Ammar Faizi wrote:
> Linux x86-64 syscall only clobbers rax, rcx and r11 (and "memory").
> 
>   - rax for the return value.
>   - rcx to save the return address.
>   - r11 to save the rflags.
(...)

Now queued, thank you Ammar. I'll pass the series to Paul once we're
done with the remaining patches.

Willy