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LL and SC instruction simulation

To: <linux-mips-bounce@linux-mips.org>, <linux-mips@linux-mips.org>
Subject: LL and SC instruction simulation
From: "Sathesh Babu Edara" <satheshbabu.edara@analog.com>
Date: Mon, 9 Jan 2006 10:24:14 +0530
In-reply-to: <43BBC85C.4040405@mips.com>
Original-recipient: rfc822;linux-mips@linux-mips.org
Sender: linux-mips-bounce@linux-mips.org
Thread-index: AcYRL2wEZATk27YPQauJfmdzF9yApgDpTFIA
 
Hi,
   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.

What is the significance of these instructions?.

Note :
   For linux-2.4.18 : We use GCC version -3.3.4 binutils version -2.15 and
uClibc version -0.9.26
For linux-2.6.12 : We use GCC version -3.4.3 binutils version -2.15 and
uClibc version -0.9.28.

Thanks in advance.

Regards,
Sathesh  


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