From: Jon Medhurst (Tixy) <tixy@yxit.co.uk>
Date: Tue, 29 Nov 2011 07:16:02 +0000 (+0100)
Subject: ARM: 7181/1: Restrict kprobes probing SWP instructions to ARMv5 and below
X-Git-Tag: v3.2-rc4~2^2~1
X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b5bed7fe801d1460424b7aeb6b06464e23d2a1e6;p=pandora-kernel.git

ARM: 7181/1: Restrict kprobes probing SWP instructions to ARMv5 and below

The SWP instruction is deprecated on ARMv6 and with ARMv7 it will be
UNDEFINED when CONFIG_SWP_EMULATE is selected. In this case, probing a
SWP instruction will cause an oops when the kprobes emulation code
executes an undefined instruction.

As the SWP instruction should be rare or non-existent in kernels for
ARMv6 and later, we can simply avoid these problems by not allowing
probing of these.

Reported-by: Leif Lindholm <leif.lindholm@arm.com>
Tested-by: Leif Lindholm <leif.lindholm@arm.com>
Acked-by: Nicolas Pitre <nicolas.pitre@linaro.org>
Signed-off-by: Jon Medhurst <tixy@yxit.co.uk>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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