From mboxrd@z Thu Jan  1 00:00:00 1970
From: Mike Frysinger <vapier@gentoo.org>
Subject: Re: [PATCH] man2 : syscall.2 : document syscall calling conventions
Date: Thu, 11 Apr 2013 21:55:43 -0400
Message-ID: <201304112155.46349.vapier@gentoo.org>
References: <1364361092-5948-1-git-send-email-ch0.han@lge.com> <201304071439.15297.vapier@gentoo.org> <BLU0-SMTP986B123D17DB8B88214F797C40@phx.gbl>
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To: John David Anglin <dave.anglin@bell.net>
Cc: Kyle McMartin <kyle@mcmartin.ca>, "Michael Kerrisk (man-pages)" <mtk.manpages@gmail.com>, linux-man <linux-man@vger.kernel.org>, Kyle McMartin <kyle@infradead.org>, Helge Deller <deller@gmx.de>, "James E.J. Bottomley" <jejb@parisc-linux.org>, linux-parisc@vger.kernel.org
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On Sunday 07 April 2013 14:48:42 John David Anglin wrote:
> On 7-Apr-13, at 2:39 PM, Mike Frysinger wrote:
> > just to be clear, the only insn you need is:
> > 	ble 0x100(%sr2, %r0);
> >=20
> > the kernel docs say sr2 holds the kernel gateway page (so i guess
> > 0x100 is a
> > known offset into that).  the docs don't mention r0 that i can see,
> > so i'm
> > guessing it's one of those "always 0" registers ?
>=20
> Yes.  There is also an entry at offset 0xb0 for light-weight-
> syscalls.  Currently,
> this implements an atomic CAS operation used for pthread support.

interesting.  sounds like a poor man's vDSO.  i'll document this the new=20
vdso(7) man page.
=2Dmike

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