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target/arm: Add state field, feature bit and migration for v8M secure…
… state As the first step in implementing ARM v8M's security extension: * add a new feature bit ARM_FEATURE_M_SECURITY * add the CPU state field that indicates whether the CPU is currently in the secure state * add a migration subsection for this new state (we will add the Secure copies of banked register state to this subsection in later patches) * add a #define for the one new-in-v8M exception type * make the CPU debug log print S/NS status Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Message-id: 1503414539-28762-4-git-send-email-peter.maydell@linaro.org
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