From: "dl-ipaddr" <dl-ipaddress@china-netcom.com>
To: <linux-kernel@vger.kernel.org>
Subject: RE: [PATCH] Pentium Pro - sysenter - doublefault
Date: Wed, 27 Aug 2003 22:25:21 +0800
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did you notice the announcement from www.apache.org and www.debian.org?

-----Original Message-----
From: linux-kernel-owner@vger.kernel.org
[mailto:linux-kernel-owner@vger.kernel.org] On Behalf Of Jamie Lokier
Sent: Wednesday, August 27, 2003 10:01 PM
To: Jim Houston; linux-kernel@vger.kernel.org; jim.houston@ccur.com
Subject: Re: [PATCH] Pentium Pro - sysenter - doublefault


Richard Curnow wrote:
> OK, since I get something different to the other reports I saw:
> 
>  1:20PM-malvern-0-534-% ./sysenter  1:20PM-malvern-STKFLT-535-% echo 
> $? 144

Hi Richard,

That's because you ran it on a 2.5/2.6 kernel, right?  The test code is
meant for 2.4 kernels and earlier :)

Here is a more universal test:

	int main () {
		asm ("movl %%esp,%%ebp;sysenter" : : "a" (1), "b" (0));
		return 0;
	}

I expect it to do the first of these which is applicable:

	- raise SIGILL on Pentium and earlier Intel CPUs
	- raise SIGILL on non-Intel CPUs which don't have the SEP
capability
	- raise SIGSEGV on Pentium Pro CPUs
	- raise SIGSEGV on Pentium II CPUs with model == 3 and stepping
< 3
	- raise SIGSEGV on 2.4 kernels
	- exit with status 0 on 2.6 kernels

Enjoy,
-- Jamie
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