4.4BSD/usr/src/old/lisp/franz/h/tahoeframe.h

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/* not used - just to look at I guess */

#define FRAMOFFSET (-8)		/* FP points to frame + 8 */

struct machframe
       {
	lispval (*pc)();
	short mask;
	short removed;
	struct machframe *fp;
	lispval *arg[2];
};