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SubjectRe: [PATCH] tools/nolibc: x86: Remove `r8`, `r9` and `r10` from the clobber list


On Wed, Oct 13, 2021, at 9:30 AM, Willy Tarreau wrote:
> Hello Michael,
>
> On Wed, Oct 13, 2021 at 04:24:28PM +0000, Michael Matz wrote:
> (...)
>> In short: Ammars initial claim:
>>
>> > 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.
>> >
>> > Other registers are preserved.
>>
>> is accurate and I will clarify the psABI to make that explicit.
>
> Many thanks for this very detailed explanation! Ammar, I'll take your
> patch.

Acked-by: Andy Lutomirski <luto@kernel.org>

>
> Thanks all,
> Willy

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