/* $FreeBSD: src/sys/alpha/include/frame.h,v 1.6 2005/01/05 20:05:50 imp Exp $ */
/* From: NetBSD: frame.h,v 1.4 1997/04/06 08:47:27 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 _ALPHA_FRAME_H_
#define	_ALPHA_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_FLAGS		27
#define FRAME_FLAGS_SYSCALL		1 /* partial frame for syscalls */
/* The following are set only when a signal is to be delivered to a process. */
#define FRAME_TRAPARG_A0	28
#define FRAME_TRAPARG_A1	29
#define FRAME_TRAPARG_A2	30

#define	FRAME_SW_SIZE	(FRAME_TRAPARG_A2 + 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 /* _ALPHA_FRAME_H_ */
