target/m68k: manage 680x0 stack frames
680x0 manages several stack frame formats: - format 0: four-word stack frame - format 1: four-word throwaway stack frame - format 2: six-word stack frame - format 3: Floating-Point post-instruction stack frame - format 4: eight-word stack frame - format 7: access-error stack frame Signed-off-by: NLaurent Vivier <laurent@vivier.eu> Reviewed-by: NRichard Henderson <richard.henderson@linaro.org> Message-Id: <20180104012913.30763-7-laurent@vivier.eu>
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