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hw/intc/armv7m_nvic: Support v8.1M CCR.TRD bit
v8.1M introduces a new TRD flag in the CCR register, which enables checking for stack frame integrity signatures on SG instructions. This bit is not banked, and is always RAZ/WI to Non-secure code. Adjust the code for handling CCR reads and writes to handle this. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Message-id: 20201119215617.29887-23-peter.maydell@linaro.org
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