db_machdep.h revision 1.13 
1/*	$NetBSD: db_machdep.h,v 1.13 1996/04/29 20:50:08 leo Exp $	*/
2
3/*
4 * Mach Operating System
5 * Copyright (c) 1992 Carnegie Mellon University
6 * All Rights Reserved.
7 *
8 * Permission to use, copy, modify and distribute this software and its
9 * documentation is hereby granted, provided that both the copyright
10 * notice and this permission notice appear in all copies of the
11 * software, derivative works or modified versions, and any portions
12 * thereof, and that both notices appear in supporting documentation.
13 *
14 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
15 * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
16 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
17 *
18 * Carnegie Mellon requests users of this software to return to
19 *
20 *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
21 *  School of Computer Science
22 *  Carnegie Mellon University
23 *  Pittsburgh PA 15213-3890
24 *
25 * any improvements or extensions that they make and grant Carnegie Mellon
26 * the rights to redistribute these changes.
27 */
28
29/*
30 * Machine-dependent defines for new kernel debugger.
31 */
32#ifndef	_M68K_DB_MACHDEP_H_
33#define	_M68K_DB_MACHDEP_H_
34
35#include <vm/vm_prot.h>
36#include <vm/vm_param.h>
37#include <vm/vm_inherit.h>
38#include <vm/lock.h>
39#include <machine/psl.h>
40#include <machine/trap.h>
41
42typedef	vm_offset_t	db_addr_t;	/* address - unsigned */
43typedef	int		db_expr_t;	/* expression - signed */
44struct mc68020_saved_state {
45	int		d0;		/* data registers */
46	int		d1;
47	int		d2;
48	int		d3;
49	int		d4;
50	int		d5;
51	int		d6;
52	int		d7;
53	int		a0;		/* address registers */
54	int		a1;
55	int		a2;
56	int		a3;
57	int		a4;
58	int		a5;
59	int		a6;
60	int		sp;		/* stack pointer */
61	short		empty;
62	short		stackadj;
63	unsigned short	sr;		/* status register */
64	unsigned int	pc;		/* program counter - UNALIGNED!!! */
65	unsigned short	stkfmt	: 4;	/* rte stack frame format */
66	unsigned short	vector	: 12;	/* vector number */
67};
68typedef struct mc68020_saved_state db_regs_t;
69db_regs_t	ddb_regs;		/* register state */
70#define DDB_REGS	(&ddb_regs)
71
72#define	PC_REGS(regs)	((db_addr_t)(regs)->pc)
73
74#define	BKPT_INST	0x4e4f		/* breakpoint instruction */
75#define	BKPT_SIZE	(2)		/* size of breakpoint inst */
76#define	BKPT_SET(inst)	(BKPT_INST)
77
78#define	FIXUP_PC_AFTER_BREAK	ddb_regs.pc -= 2;
79
80#define SR_T1 0x8000
81#define	db_clear_single_step(regs)	((regs)->sr &= ~SR_T1)
82#define	db_set_single_step(regs)	((regs)->sr |=  SR_T1)
83
84#define	IS_BREAKPOINT_TRAP(type, code)	((type) == T_BREAKPOINT)
85#ifdef T_WATCHPOINT
86#define	IS_WATCHPOINT_TRAP(type, code)	((type) == T_WATCHPOINT)
87#else
88#define	IS_WATCHPOINT_TRAP(type, code)	0
89#endif
90
91#define	M_RTS		0xffff0000
92#define I_RTS		0x4e750000
93#define M_JSR		0xffc00000
94#define I_JSR		0x4e800000
95#define M_BSR		0xff000000
96#define I_BSR		0x61000000
97#define	M_RTE		0xffff0000
98#define	I_RTE		0x4e730000
99
100#define	inst_trap_return(ins)	(((ins)&M_RTE) == I_RTE)
101#define	inst_return(ins)	(((ins)&M_RTS) == I_RTS)
102#define	inst_call(ins)		(((ins)&M_JSR) == I_JSR || \
103				 ((ins)&M_BSR) == I_BSR)
104#define inst_load(ins)		0
105#define inst_store(ins)		0
106
107#ifdef _KERNEL
108
109void	kdb_kintr __P((struct mc68020_saved_state *));
110int	kdb_trap __P((int, struct mc68020_saved_state *));
111
112#endif /* _KERNEL */
113
114#endif	/* _M68K_DB_MACHDEP_H_ */
115