From: Will Deacon <will.deacon@arm.com>
Date: Mon, 8 Aug 2011 13:26:53 +0000 (+0100)
Subject: ARM: hw_breakpoint: trap undef instruction exceptions in reset_ctrl_regs
X-Git-Tag: v3.2-rc1~130^2~7^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0d352e3d006c9589f22580212c3822cf62b6d775;p=pandora-kernel.git

ARM: hw_breakpoint: trap undef instruction exceptions in reset_ctrl_regs

The ARM debug registers can only be accessed if the DBGSWENABLE signal
to the core is driven HIGH by the DAP. The architecture does not provide
a way to detect the value of this signal, so the best we can do is
register an undef_hook to trap debug register co-processor accesses and
then fail if the trap is taken.

Signed-off-by: Will Deacon <will.deacon@arm.com>
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