[PATCH 3/4] Add condition code checking to SWP emulation handler.

[Will Deacon]

On Fri, Dec 09, 2011 at 06:54:57PM +0000, Leif Lindholm wrote:
> 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 at arm.com>
> ---
>  arch/arm/kernel/swp_emulate.c |   16 ++++++++++++++++
>  1 files changed, 16 insertions(+), 0 deletions(-)

Reviewed-by: Will Deacon <will.deacon at arm.com>

Will