/*	$NetBSD: db_machdep.h,v 1.2 1996/04/08 18:35:47 ragge Exp $	*/

/* 
 * Mach Operating System
 * Copyright (c) 1991,1990 Carnegie Mellon University
 * All Rights Reserved.
 * 
 * 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 Mellon
 * the rights to redistribute these changes.
 */

#ifndef	_VAX_DB_MACHDEP_H_
#define	_VAX_DB_MACHDEP_H_

/*
 * Machine-dependent defines for new kernel debugger.
 * Modified for vax out of i386 code.
 */

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

typedef	vm_offset_t	db_addr_t;	/* address - unsigned */
typedef	int		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)->pc)

#define	BKPT_INST	0x03		/* breakpoint instruction */
#define	BKPT_SIZE	(1)		/* size of breakpoint inst */
#define	BKPT_SET(inst)	(BKPT_INST)

#define	FIXUP_PC_AFTER_BREAK		ddb_regs.pc -= BKPT_SIZE;

#define	db_clear_single_step(regs)	((regs)->psl &= ~PSL_T)
#define	db_set_single_step(regs)	((regs)->psl |=  PSL_T)

#define	IS_BREAKPOINT_TRAP(type, code)	((type) == T_BPTFLT)
#define IS_WATCHPOINT_TRAP(type, code)	((type) == T_TRCTRAP)

#define	I_CALL		0xfb
#define	I_RET		0x04
#define	I_IRET		0x02

#define	inst_trap_return(ins)	(((ins)&0xff) == I_IRET)
#define	inst_return(ins)	(((ins)&0xff) == I_RET)
#define	inst_call(ins)		(((ins)&0xff) == I_CALL)

#define inst_load(ins)		0
#define inst_store(ins)		0

/* Prototypes */
void	kdb_trap __P((struct trapframe *));
#endif	/* _VAX_DB_MACHDEP_H_ */
