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Because of the complexity of setting ESR, re-use the existing arm_cpu_do_unaligned_access function. This means we have to handle the exception ourselves in cpu_loop, transforming it to the appropriate signal. Reviewed-by: Warner Losh <imp@bsdimp.com> Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>