From: Jamie Lokier <jamie@shareable.org>
To: Jakob Oestergaard <jakob@unthought.net>,
Jim Houston <jim.houston@comcast.net>,
linux-kernel@vger.kernel.org, jim.houston@ccur.com
Subject: Re: [PATCH] Pentium Pro - sysenter - doublefault
Date: Mon, 25 Aug 2003 06:50:28 +0100 [thread overview]
Message-ID: <20030825055028.GE20529@mail.jlokier.co.uk> (raw)
In-Reply-To: <20030825041423.GB29987@unthought.net>
Jakob Oestergaard wrote:
> > Jim you can answer this as you have such a Ppro. Could you please run
> > this very simple userspace program for me, and report the result?
> >
> > int main() { __asm__ ("sysenter"); return 0; }
>
> I tested on two boxes:
>
> Stepping 1 ppro: SIGSEGV
> Stepping 7 ppro: SIGSEGV
Thank you!
So that means the sysenter instruction _does_ exist on the PPro and
early Pentium II, but it isn't usable.
It's safe so long as it is disabled, but as you found, when you enable
and use it, it doesn't work as expected. (I wonder what the actual
behaviour of sysenter/sysexit are on these CPUs.)
-- Jamie
next prev parent reply other threads:[~2003-08-25 5:50 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-08-21 20:41 Jim Houston
2003-08-21 21:32 ` Mikael Pettersson
2003-08-22 2:18 ` [PATCH2] " Jim Houston
2003-08-25 5:56 ` [PATCH] " Jamie Lokier
2003-08-25 6:09 ` Jamie Lokier
2003-09-03 12:50 ` Pavel Machek
2003-09-08 14:05 ` Jamie Lokier
2003-08-25 4:05 ` Jamie Lokier
2003-08-25 4:14 ` Jakob Oestergaard
2003-08-25 5:50 ` Jamie Lokier [this message]
2003-08-25 6:29 ` Jamie Lokier
2003-08-25 7:49 ` Jakob Oestergaard
2003-08-25 18:15 ` Jim Houston
2003-08-26 12:26 ` Richard Curnow
2003-08-27 14:01 ` Jamie Lokier
2003-08-27 14:23 ` Richard Curnow
2003-08-27 14:25 ` dl-ipaddr
2003-08-27 15:15 ` Stan Bubrouski
2003-08-27 16:02 ` Pasi Savolainen
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