/*	$OpenBSD: db_machdep.h,v 1.2 1996/07/29 22:58:35 niklas Exp $	*/
/*	$NetBSD: db_machdep.h,v 1.1 1995/11/23 02:35:54 cgd Exp $	*/

/*
 * Copyright (c) 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_DB_MACHDEP_H_
#define	_ALPHA_DB_MACHDEP_H_

/*
 * Machine-dependent defines for new kernel debugger.
 */

#include <sys/param.h>
#include <vm/vm.h>
#include <machine/frame.h>

typedef	vm_offset_t	db_addr_t;	/* address - unsigned */
typedef	long		db_expr_t;	/* expression - signed */

typedef struct trapframe db_regs_t;
db_regs_t		ddb_regs;	/* register state */
#define	DDB_REGS	(&ddb_regs)

#define	PC_REGS(regs)	((db_addr_t)(regs)->tf_pc)

#define	BKPT_INST	0x00000080	/* breakpoint instruction */
#define	BKPT_SIZE	(4)		/* size of breakpoint inst */
#define	BKPT_SET(inst)	(BKPT_INST)

#define	FIXUP_PC_AFTER_BREAK	ddb_regs.tf_pc -= BKPT_SIZE;

#endif	/* _ALPHA_DB_MACHDEP_H_ */