From: Leif Lindholm <leif.lindholm@arm.com>
Date: Mon, 12 Dec 2011 18:45:24 +0000 (+0100)
Subject: ARM: 7208/1: Add condition code checking to SWP emulation handler.
X-Git-Tag: sz_155~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1593bba2d9619e0615ec30c43a6bac4940cd9870;p=pandora-kernel.git

ARM: 7208/1: Add condition code checking to SWP emulation handler.

This patch fixes two separate issues with the SWP emulation handler:
1: Certain processors implementing ARMv7-A can (legally) take an
   undef exception even when the condition code would have meant that
   the instruction should not have been executed.
2: Opcodes with all flags set (condition code = 0xf) have been reused
   in recent, and not-so-recent, versions of the ARM architecture to
   implement unconditional extensions to the instruction set. The
   existing code would still have processed any undefs triggered by
   executing an opcode with such a value.

This patch uses the new generic ARM instruction set condition code
checks to implement proper handling of these situations.

Signed-off-by: Leif Lindholm <leif.lindholm@arm.com>
Reviewed-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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