usr/src/sys/vax/frame.h

/*
 * Copyright (c) 1982, 1986 Regents of the University of California.
 * All rights reserved.  The Berkeley software License Agreement
 * specifies the terms and conditions for redistribution.
 *
 *      @(#)frame.h     7.1 (Berkeley) 6/5/86
 */

/*
 * Definition of the vax calls/callg frame.
 */
struct frame {
        int     fr_handler;
        u_int   fr_psw:16,              /* saved psw */
                fr_mask:12,             /* register save mask */
                :1,
                fr_s:1,                 /* call was a calls, not callg */
                fr_spa:2;               /* stack pointer alignment */
        int     fr_savap;               /* saved arg pointer */
        int     fr_savfp;               /* saved frame pointer */
        int     fr_savpc;               /* saved program counter */
};