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Factor out the code which changes the CPU state so as to actually take an exception to AArch32. We're going to want to use this for handling exception entry to Hyp mode. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Reviewed-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com> Reviewed-by: Luc Michel <luc.michel@greensocs.com> Message-id: 20180820153020.21478-4-peter.maydell@linaro.org