/*      $OpenBSD: frame.h,v 1.4 2011/03/23 16:54:34 pirofti Exp $       */
/*      $NetBSD: frame.h,v 1.3 1996/07/11 05:31:32 cgd Exp $    */

/*
 * Copyright (c) 1994, 1995 Carnegie-Mellon University.
 * All rights reserved.
 *
 * Author: Chris G. Demetriou
 * 
 * Permission to use, copy, modify and distribute this software and
 * its documentation is hereby granted, provided that both the copyright
 * notice and this permission notice appear in all copies of the
 * software, derivative works or modified versions, and any portions
 * thereof, and that both notices appear in supporting documentation.
 * 
 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 
 * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND 
 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
 * 
 * Carnegie Mellon requests users of this software to return to
 *
 *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
 *  School of Computer Science
 *  Carnegie Mellon University
 *  Pittsburgh PA 15213-3890
 *
 * any improvements or extensions that they make and grant Carnegie the
 * rights to redistribute these changes.
 */

#ifndef _MACHINE_FRAME_H_
#define _MACHINE_FRAME_H_

#include <machine/alpha_cpu.h>

/*
 * Software trap, exception, and syscall frame.
 *
 * Includes "hardware" (PALcode) frame.
 *
 * PALcode puts ALPHA_HWFRAME_* fields on stack.  We have to add
 * all of the general-purpose registers except for zero, for sp
 * (which is automatically saved in the PCB's USP field for entries
 * from user mode, and which is implicitly saved and restored by the
 * calling conventions for entries from kernel mode), and (on traps
 * and exceptions) for a0, a1, and a2 (which are saved by PALcode).
 */

/* Quadword offsets of the registers to be saved. */
#define FRAME_V0        0
#define FRAME_T0        1
#define FRAME_T1        2
#define FRAME_T2        3
#define FRAME_T3        4
#define FRAME_T4        5
#define FRAME_T5        6
#define FRAME_T6        7
#define FRAME_T7        8
#define FRAME_S0        9
#define FRAME_S1        10
#define FRAME_S2        11
#define FRAME_S3        12
#define FRAME_S4        13
#define FRAME_S5        14
#define FRAME_S6        15
#define FRAME_A3        16
#define FRAME_A4        17
#define FRAME_A5        18
#define FRAME_T8        19
#define FRAME_T9        20
#define FRAME_T10       21
#define FRAME_T11       22
#define FRAME_RA        23
#define FRAME_T12       24
#define FRAME_AT        25
#define FRAME_SP        26

#define FRAME_SW_SIZE   (FRAME_SP + 1)
#define FRAME_HW_OFFSET FRAME_SW_SIZE

#define FRAME_PS        (FRAME_HW_OFFSET + ALPHA_HWFRAME_PS)
#define FRAME_PC        (FRAME_HW_OFFSET + ALPHA_HWFRAME_PC)
#define FRAME_GP        (FRAME_HW_OFFSET + ALPHA_HWFRAME_GP)
#define FRAME_A0        (FRAME_HW_OFFSET + ALPHA_HWFRAME_A0)
#define FRAME_A1        (FRAME_HW_OFFSET + ALPHA_HWFRAME_A1)
#define FRAME_A2        (FRAME_HW_OFFSET + ALPHA_HWFRAME_A2)

#define FRAME_HW_SIZE   ALPHA_HWFRAME_SIZE
#define FRAME_SIZE      (FRAME_HW_OFFSET + FRAME_HW_SIZE)

struct trapframe {
        unsigned long   tf_regs[FRAME_SIZE];    /* See above */
};

#endif /* _MACHINE_FRAME_H_ */