linux-kernel - Re: [PATCH v1 3/3] Documentation: x86-64: Document registers on entry and exit

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Message-ID: <Yeq16JjCBXmxgWaj@zn.tnic>
Date:   Fri, 21 Jan 2022 14:32:24 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Andy Lutomirski <luto@...nel.org>
Cc:     Ammar Faizi <ammarfaizi2@...weeb.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "H. Peter Anvin" <hpa@...or.com>, x86-ml <x86@...nel.org>,
        lkml <linux-kernel@...r.kernel.org>,
        GNU/Weeb Mailing List <gwml@...weeb.org>,
        Michael Matz <matz@...e.de>, "H.J. Lu" <hjl.tools@...il.com>,
        Jonathan Corbet <corbet@....net>, Willy Tarreau <w@....eu>
Subject: Re: [PATCH v1 3/3] Documentation: x86-64: Document registers on
 entry and exit

On Fri, Jan 07, 2022 at 04:02:27PM -0800, Andy Lutomirski wrote:
> This is SYSCALL64 registers on entry, not general registers on entry. Also,
> this has little to do with the entry logic, so it probably doesn't belong in
> this file.

Right, except that syscall is also a kernel entry point so it kinda
belongs in a documentation file called "entry". :)

Srsly, I'd really like to keep the note about which registers glibc
considers clobbered and which not, documented somewhere as that is
practically an ABI which is not (yet) in the psABI doc.

Thx.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette