From: Ammar Faizi <ammar.faizi@students.amikom.ac.id>
To: Borislav Petkov <bp@alien8.de>
Cc: Ammar Faizi <ammar.faizi@students.amikom.ac.id>,
Michael Matz <matz@suse.de>, Willy Tarreau <w@1wt.eu>,
Paul Walmsley <paul.walmsley@sifive.com>,
Palmer Dabbelt <palmer@dabbelt.com>,
Albert Ou <aou@eecs.berkeley.edu>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Andy Lutomirski <luto@kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>,
x86@kernel.org, "H. Peter Anvin" <hpa@zytor.com>
Subject: Re: [PATCH] tools/nolibc: x86: Remove `r8`, `r9` and `r10` from the clobber list
Date: Thu, 14 Oct 2021 15:44:43 +0700 [thread overview]
Message-ID: <HvtY0TQ1cVfJf5WD1XTAig@gnuweeb.org> (raw)
In-Reply-To: <YWcOvmXkSiecGkER@zn.tnic>
On Wed, Oct 13, 2021 at 11:52 PM Borislav Petkov <bp@alien8.de> wrote:
>
> On Wed, Oct 13, 2021 at 06:30:23PM +0200, 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.
Thanks all.
>
> Great, why are we dealing with some funky document when the law is in
> glibc sources?!
>
> :-)))
>
> Ammar, if you wanna fixup the comment in entry_64.S too - make sure you
> explain that glibc expects argument registers to be restored - I'll take
> that patch too.
>
> :-)
Yay! I will send a patch for it, on this or next week.
>
> Thx, that was fun.
>
--
Ammar Faizi
next prev parent reply other threads:[~2021-10-14 8:49 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-11 4:03 [PATCH] tools/nolibc: x86: Remove `r8`, `r9` and `r10` from the clobber list Ammar Faizi
2021-10-12 5:28 ` Willy Tarreau
2021-10-12 8:36 ` Ammar Faizi
2021-10-12 9:06 ` Willy Tarreau
2021-10-12 20:29 ` Borislav Petkov
2021-10-12 21:51 ` Borislav Petkov
2021-10-12 22:23 ` Ammar Faizi
2021-10-13 3:01 ` Willy Tarreau
2021-10-13 3:32 ` Ammar Faizi
2021-10-13 3:34 ` Ammar Faizi
2021-10-13 3:37 ` Ammar Faizi
2021-10-13 12:43 ` Borislav Petkov
2021-10-13 12:51 ` Willy Tarreau
2021-10-13 13:06 ` Borislav Petkov
2021-10-13 14:07 ` Willy Tarreau
2021-10-13 14:20 ` Borislav Petkov
2021-10-13 14:24 ` Willy Tarreau
2021-10-13 16:24 ` Michael Matz
2021-10-13 16:30 ` Willy Tarreau
2021-10-13 16:51 ` Andy Lutomirski
2021-10-13 16:52 ` Borislav Petkov
2021-10-14 8:44 ` Ammar Faizi [this message]
2021-10-14 12:44 ` Michael Matz
2021-10-14 14:31 ` Borislav Petkov
2021-10-19 9:06 ` David Laight
2021-10-23 20:40 ` H. Peter Anvin
2021-10-12 21:21 ` David Laight
2021-10-12 23:02 ` Subject: " Ammar Faizi
2021-10-13 9:03 ` [PATCH v2] " Ammar Faizi
2021-10-15 8:25 ` [PATCH 0/2] Fix clobber list and startup code bug Ammar Faizi
2021-10-15 8:25 ` [PATCH 1/2] tools/nolibc: x86: Remove `r8`, `r9` and `r10` from the clobber list Ammar Faizi
2021-10-18 5:52 ` Willy Tarreau
2021-10-15 8:25 ` [PATCH 2/2] tools/nolibc: x86-64: Fix startup code bug Ammar Faizi
2021-10-15 8:57 ` Ammar Faizi
2021-10-15 9:26 ` Bedirhan KURT
2021-10-15 9:58 ` Ammar Faizi
2021-10-15 9:41 ` Louvian Lyndal
2021-10-18 4:58 ` Willy Tarreau
2021-10-18 6:53 ` Ammar Faizi
2021-10-23 13:27 ` Ammar Faizi
2021-10-23 13:43 ` Willy Tarreau
2021-10-24 2:11 ` [PATCHSET v2 0/2] tools/nolibc: Fix startup code bug and small improvement Ammar Faizi
2021-10-24 2:11 ` [PATCH 1/2] tools/nolibc: x86-64: Fix startup code bug Ammar Faizi
2021-10-24 2:11 ` [PATCH 2/2] tools/nolibc: x86-64: Use `mov $60,%eax` instead of `mov $60,%rax` Ammar Faizi
2021-10-24 11:41 ` [PATCHSET v2 0/2] tools/nolibc: Fix startup code bug and small improvement Willy Tarreau
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=HvtY0TQ1cVfJf5WD1XTAig@gnuweeb.org \
--to=ammar.faizi@students.amikom.ac.id \
--cc=aou@eecs.berkeley.edu \
--cc=bp@alien8.de \
--cc=hpa@zytor.com \
--cc=linux-kernel@vger.kernel.org \
--cc=luto@kernel.org \
--cc=matz@suse.de \
--cc=mingo@redhat.com \
--cc=palmer@dabbelt.com \
--cc=paul.walmsley@sifive.com \
--cc=tglx@linutronix.de \
--cc=w@1wt.eu \
--cc=x86@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).