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Re: LL and SC instruction simulation

To: "Ralf Baechle" <ralf@linux-mips.org>, "Sathesh Babu Edara" <satheshbabu.edara@analog.com>
Subject: Re: LL and SC instruction simulation
From: "Kevin D. Kissell" <kevink@mips.com>
Date: Mon, 9 Jan 2006 16:17:50 +0100
Cc: <linux-mips-bounce@linux-mips.org>, <linux-mips@linux-mips.org>
Original-recipient: rfc822;linux-mips@linux-mips.org
References: <200601090742.k097gYaZ017304@lilac.hdcindia.analog.com> <200601090749.k097nFaZ017891@lilac.hdcindia.analog.com> <20060109145425.GA4286@linux-mips.org>
Sender: linux-mips-bounce@linux-mips.org
Ralf writes:
> On Mon, Jan 09, 2006 at 01:19:46PM +0530, Sathesh Babu Edara wrote:
> 
> >    We have ported linux-2.4.18 and linux-2-6.12 kernel (mips.org)onto MIPS
> > processor (CPU type lx4189).
> > 
> >  We observed that on 2.4 kernel,ll and sc instruction exception handlers
> > hitting very often.
> > Where as on linux-2.6.12 this is not happening.
> 
> > Can anybody have idea why this instructions are hitting on 2.4.18 kernel and
> > not on 2-6.12 kernel.
> 
> Only ll/sc instructions in application software can be emulated, so it
> would seem your application is behaving different on 2.4 and 2.6 kernels.

Is there an interface where 2.6 might be telling library code to use system 
calls
instead LL/SC, where the 2.4 kernel didn't?

            Regards,

            Kevin K.

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