target-arm: Implement AArch64 EL1 exception handling
Implement exception handling for AArch64 EL1. Exceptions from AArch64 or AArch32 EL0 are supported. Signed-off-by: NRob Herring <rob.herring@linaro.org> [PMM: fixed minor style nits; updated to match changes in previous patches; added some of the simpler cases of illegal-exception-return support] Signed-off-by: NPeter Maydell <peter.maydell@linaro.org> Reviewed-by: NPeter Crosthwaite <peter.crosthwaite@xilinx.com>
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