db_trap.c revision 1.2 
1/*
2 * Mach Operating System
3 * Copyright (c) 1991,1990 Carnegie Mellon University
4 * All Rights Reserved.
5 *
6 * Permission to use, copy, modify and distribute this software and its
7 * documentation is hereby granted, provided that both the copyright
8 * notice and this permission notice appear in all copies of the
9 * software, derivative works or modified versions, and any portions
10 * thereof, and that both notices appear in supporting documentation.
11 *
12 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS
13 * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
14 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
15 *
16 * Carnegie Mellon requests users of this software to return to
17 *
18 *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
19 *  School of Computer Science
20 *  Carnegie Mellon University
21 *  Pittsburgh PA 15213-3890
22 *
23 * any improvements or extensions that they make and grant Carnegie the
24 * rights to redistribute these changes.
25 */
26/*
27 * $Id: db_trap.c,v 1.2 1993/05/20 03:39:34 cgd Exp $
28 *
29 * HISTORY
30 * $Log: db_trap.c,v $
31 * Revision 1.2  1993/05/20 03:39:34  cgd
32 * add explicit rcs id
33 *
34 * Revision 1.1.1.1  1993/03/21  09:46:27  cgd
35 * initial import of 386bsd-0.1 sources
36 *
37 * Revision 1.1  1992/03/25  21:45:31  pace
38 * Initial revision
39 *
40 * Revision 2.5  91/02/05  17:07:16  mrt
41 * 	Changed to new Mach copyright
42 * 	[91/01/31  16:19:35  mrt]
43 *
44 * Revision 2.4  91/01/08  15:09:17  rpd
45 * 	Changed db_stop_at_pc's arguments.
46 * 	Print db_inst_count, db_load_count, db_store_count.
47 * 	[90/11/27            rpd]
48 *
49 * Revision 2.3  90/10/25  14:44:11  rwd
50 * 	From rpd.
51 * 	[90/10/19  17:03:17  rwd]
52 *
53 * 	Generalized the watchpoint support.
54 * 	[90/10/16            rwd]
55 * 	Added watchpoint support.
56 * 	[90/10/16            rpd]
57 *
58 * Revision 2.2  90/08/27  21:52:52  dbg
59 * 	Assign to db_dot before calling the print function.
60 * 	[90/08/20            af]
61 * 	Reduce lint.
62 * 	[90/08/07            dbg]
63 * 	Created.
64 * 	[90/07/25            dbg]
65 *
66 */
67/*
68 * 	Author: David B. Golub, Carnegie Mellon University
69 *	Date:	7/90
70 */
71
72/*
73 * Trap entry point to kernel debugger.
74 */
75#include "param.h"
76#include "proc.h"
77#include <ddb/db_command.h>
78#include <ddb/db_break.h>
79
80extern void		db_restart_at_pc();
81extern boolean_t	db_stop_at_pc();
82
83extern int		db_inst_count;
84extern int		db_load_count;
85extern int		db_store_count;
86
87db_trap(type, code)
88	int	type, code;
89{
90	boolean_t	bkpt;
91	boolean_t	watchpt;
92
93	bkpt = IS_BREAKPOINT_TRAP(type, code);
94	watchpt = IS_WATCHPOINT_TRAP(type, code);
95
96	if (db_stop_at_pc(&bkpt)) {
97	    if (db_inst_count) {
98		db_printf("After %d instructions (%d loads, %d stores),\n",
99			  db_inst_count, db_load_count, db_store_count);
100	    }
101	    if (bkpt)
102		db_printf("Breakpoint at\t");
103	    else if (watchpt)
104		db_printf("Watchpoint at\t");
105	    else
106		db_printf("Stopped at\t");
107	    db_dot = PC_REGS(DDB_REGS);
108	    db_print_loc_and_inst(db_dot);
109
110	    db_command_loop();
111	}
112
113	db_restart_at_pc(watchpt);
114}
115