From: Pavel Machek <pavel@suse.cz>
To: Anton Blanchard <anton@samba.org>
Cc: "H. Peter Anvin" <hpa@zytor.com>, linux-kernel@vger.kernel.org
Subject: Re: [PATCH][2.4.20-pre5] non syscall gettimeofday
Date: Sat, 7 Sep 2002 03:29:58 +0000 [thread overview]
Message-ID: <20020907032957.B35@toy.ucw.cz> (raw)
In-Reply-To: <20020906012144.GA6804@krispykreme>; from anton@samba.org on Fri, Sep 06, 2002 at 11:21:44AM +1000
Hi!
> > This sounds like a vsyscall. Since we have discussed vsyscalls on and
> > off without getting anywhere, I'd like to know how your implementation
> > does it -- the #1 proposal I think was to map in a page at 0xfffff000
> > and have the vsyscall code there.
>
> Id like to do a similar thing on ppc32 and ppc64. It would be good to
> make some of this generic before everyone implements it their own way.
>
> Of course the lower level stuff will be arch specific, but some of it
> could be the same (like how do we handle ptracing into the area? Do
> we COW or do we deny it and fix gdb to unsderstand vsyscalls).
It is already implemented on x86-64.
AFAIR putting breakpoints into vsyscall area is not permitted.
Pavel
--
Philips Velo 1: 1"x4"x8", 300gram, 60, 12MB, 40bogomips, linux, mutt,
details at http://atrey.karlin.mff.cuni.cz/~pavel/velo/index.html.
prev parent reply other threads:[~2002-09-08 19:07 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-09-05 23:12 Stephen Hemminger
2002-09-05 23:32 ` Alan Cox
2002-09-05 23:38 ` H. Peter Anvin
2002-09-06 1:21 ` Anton Blanchard
2002-09-07 3:29 ` Pavel Machek [this message]
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