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Before we introduce blocking semihosting calls we need to ensure we can restart the system on semi hosting exception. To be able to do this the EXCP_SEMIHOST operation should be idempotent until it finally completes. Practically this means ensureing we only update the pc after the semihosting call has completed. Signed-off-by: Alex Bennée <alex.bennee@linaro.org> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Reviewed-by: Keith Packard <keithp@keithp.com> Tested-by: Keith Packard <keithp@keithp.com>