ARM: hw_breakpoint: trap undef instruction exceptions in reset_ctrl_regs

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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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Will Deacon 2011-08-08 14:26:53 +01:00

parent 6f26aa05c9

commit 0d352e3d00

1 changed files with 37 additions and 9 deletions

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arch/arm/kernel/hw_breakpoint.c

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