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The Arm v8M architecture includes hardware stack limit checking. When certain instructions update the stack pointer, if the new value of SP is below the limit set in the associated limit register then an exception is taken. Add a TB flag that tracks whether the limit-checking code needs to be emitted. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com> Message-id: 20181002163556.10279-2-peter.maydell@linaro.org