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target-arm: Handle exception return from AArch64 to non-EL0 AArch32
Remove the assumptions that the AArch64 exception return code was making about a return to AArch32 always being a return to EL0. This includes pulling out the illegal-SPSR checks so we can apply them for return to 32 bit as well as return to 64-bit. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>
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