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ARMv7VE introduced the ERET instruction, which is necessary to return from an exception taken to Hyp mode. Implement this. In A32 encoding it is a completely new encoding; in T32 it is an adjustment of the behaviour of the existing "SUBS PC, LR, #<imm8>" instruction. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com> Reviewed-by: Luc Michel <luc.michel@greensocs.com> Message-id: 20180814124254.5229-10-peter.maydell@linaro.org