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In the Arm ARM, rule R_TYTWB states that returning to AArch32 is an illegal exception return if: * AArch32 is not supported at any exception level * the target EL is configured for AArch64 via SCR_EL3.RW or HCR_EL2.RW or via CPU state at reset We check the second of these, but not the first (which can only be relevant for the case of a return to EL0, because if AArch32 is not supported at one of the higher ELs then the RW bits will have an effective value of 1 and the the "configured for AArch64" condition will hold also). Add the missing condition. Although this is technically a bug (because we have one AArch64-only CPU: a64fx) it isn't worth backporting to stable because no sensible guest code will deliberately try to return to a nonexistent execution state to check that it gets an illegal exception return. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> |
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