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

[Andy Lutomirski]

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@xxxxxxxxxx>

>
> Thanks all,
> Willy