db_trap.c revision 1.4 
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 * 	Author: David B. Golub, Carnegie Mellon University
27 *	Date:	7/90
28 *	$Id: db_trap.c,v 1.4 1994/04/04 08:59:38 mycroft Exp $
29 */
30
31/*
32 * Trap entry point to kernel debugger.
33 */
34#include <sys/param.h>
35#include <sys/proc.h>
36
37#include <ddb/db_command.h>
38#include <ddb/db_break.h>
39
40#include <setjmp.h>
41
42extern void		db_restart_at_pc();
43extern boolean_t	db_stop_at_pc();
44
45extern int		db_inst_count;
46extern int		db_load_count;
47extern int		db_store_count;
48
49extern jmp_buf		*db_recover;
50
51db_trap(type, code)
52	int	type, code;
53{
54	boolean_t	bkpt;
55	boolean_t	watchpt;
56	jmp_buf		db_jmpbuf;
57	jmp_buf		*savejmp = db_recover;
58
59	bkpt = IS_BREAKPOINT_TRAP(type, code);
60	watchpt = IS_WATCHPOINT_TRAP(type, code);
61
62	if (db_stop_at_pc(&bkpt)) {
63	    if (db_inst_count) {
64		db_printf("After %d instructions (%d loads, %d stores),\n",
65			  db_inst_count, db_load_count, db_store_count);
66	    }
67	    if (bkpt)
68		db_printf("Breakpoint at\t");
69	    else if (watchpt)
70		db_printf("Watchpoint at\t");
71	    else
72		db_printf("Stopped at\t");
73	    db_dot = PC_REGS(DDB_REGS);
74	    if (!setjmp(*(db_recover = &db_jmpbuf)))
75		db_print_loc_and_inst(db_dot);
76
77	    db_command_loop();
78	}
79
80	db_restart_at_pc(watchpt);
81}
82