From: Mike Frysinger <vapier@gentoo.org>
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
Subject: Re: [PATCH] man2 : syscall.2 : document syscall calling conventions
Date: Thu, 11 Apr 2013 21:55:43 -0400 [thread overview]
Message-ID: <201304112155.46349.vapier@gentoo.org> (raw)
In-Reply-To: <BLU0-SMTP986B123D17DB8B88214F797C40@phx.gbl>
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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);
> >
> > 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 ?
>
> 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
vdso(7) man page.
-mike
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next prev parent reply other threads:[~2013-04-12 1:55 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1364361092-5948-1-git-send-email-ch0.han@lge.com>
[not found] ` <201304010632.41520.vapier@gentoo.org>
[not found] ` <CAKgNAkgG2kdCC1tyZQkYU7O_nP7RB8VoCmx6eb8FcudU1s6RgA@mail.gmail.com>
[not found] ` <201304021917.17659.vapier@gentoo.org>
2013-04-07 10:00 ` [PATCH] man2 : syscall.2 : document syscall calling conventions Michael Kerrisk (man-pages)
2013-04-07 13:55 ` Kyle McMartin
2013-04-07 14:56 ` James Bottomley
2013-04-07 15:11 ` Kyle McMartin
[not found] ` <20130407151134.GX12938-PfSpb0PWhxZc2C7mugBRk2EX/6BAtgUQ@public.gmane.org>
2013-04-07 15:38 ` James Bottomley
2013-04-08 9:18 ` Michael Kerrisk (man-pages)
[not found] ` <20130407135514.GW12938-PfSpb0PWhxZc2C7mugBRk2EX/6BAtgUQ@public.gmane.org>
2013-04-07 18:39 ` Mike Frysinger
2013-04-07 18:48 ` John David Anglin
[not found] ` <BLU0-SMTP986B123D17DB8B88214F797C40-MsuGFMq8XAE@public.gmane.org>
2013-04-08 9:20 ` Michael Kerrisk (man-pages)
2013-04-12 1:55 ` Mike Frysinger [this message]
[not found] ` <201304112155.46349.vapier-aBrp7R+bbdUdnm+yROfE0A@public.gmane.org>
2013-04-12 2:34 ` John David Anglin
2013-04-12 3:38 ` Mike Frysinger
2013-04-12 4:45 ` James Bottomley
2013-04-12 12:17 ` John David Anglin
2013-04-12 18:45 ` Mike Frysinger
2013-04-12 19:14 ` James Bottomley
2013-04-12 19:46 ` Mike Frysinger
2013-04-12 20:25 ` James Bottomley
2013-04-12 14:01 ` Kyle McMartin
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