db_trap.c revision 1.15 
1/*	$OpenBSD: db_trap.c,v 1.15 2010/11/27 19:57:23 miod Exp $	*/
2/*	$NetBSD: db_trap.c,v 1.9 1996/02/05 01:57:18 christos Exp $	*/
3
4/*
5 * Mach Operating System
6 * Copyright (c) 1993,1992,1991,1990 Carnegie Mellon University
7 * All Rights Reserved.
8 *
9 * Permission to use, copy, modify and distribute this software and its
10 * documentation is hereby granted, provided that both the copyright
11 * notice and this permission notice appear in all copies of the
12 * software, derivative works or modified versions, and any portions
13 * thereof, and that both notices appear in supporting documentation.
14 *
15 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
16 * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
17 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
18 *
19 * Carnegie Mellon requests users of this software to return to
20 *
21 *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
22 *  School of Computer Science
23 *  Carnegie Mellon University
24 *  Pittsburgh PA 15213-3890
25 *
26 * any improvements or extensions that they make and grant Carnegie Mellon
27 * the rights to redistribute these changes.
28 *
29 * 	Author: David B. Golub, Carnegie Mellon University
30 *	Date:	7/90
31 */
32
33/*
34 * Trap entry point to kernel debugger.
35 */
36#include <sys/param.h>
37#include <sys/proc.h>
38#include <sys/systm.h>
39
40#include <uvm/uvm_extern.h>
41
42#include <machine/db_machdep.h>
43
44#include <ddb/db_run.h>
45#include <ddb/db_command.h>
46#include <ddb/db_break.h>
47#include <ddb/db_output.h>
48#include <ddb/db_sym.h>
49#include <ddb/db_extern.h>
50#include <ddb/db_interface.h>
51
52void
53db_trap(int type, int code)
54{
55	boolean_t	bkpt;
56	boolean_t	watchpt;
57
58	bkpt = IS_BREAKPOINT_TRAP(type, code);
59	watchpt = IS_WATCHPOINT_TRAP(type, code);
60
61	if (db_stop_at_pc(DDB_REGS, &bkpt)) {
62		if (db_inst_count) {
63			db_printf("After %d instructions\n", db_inst_count);
64		}
65		if (bkpt)
66			db_printf("Breakpoint at\t");
67		else if (watchpt)
68			db_printf("Watchpoint at\t");
69		else
70			db_printf("Stopped at\t");
71		db_dot = PC_REGS(DDB_REGS);
72		db_print_loc_and_inst(db_dot);
73
74		/*
75		 * Just in case we do not have any usable console driver,
76		 * give the user a traceback.
77		 */
78		if (cold) {
79			db_stack_trace_print(db_dot, 0, 10 /* arbitrary */, "",
80			    db_printf);
81		}
82
83		if (panicstr != NULL) {
84			if (db_print_position() != 0)
85				db_printf("\n");
86			db_printf("RUN AT LEAST 'trace' AND 'ps' AND INCLUDE "
87			    "OUTPUT WHEN REPORTING THIS PANIC!\n");
88#ifdef MULTIPROCESSOR
89			db_printf("IF RUNNING SMP, USE 'mach ddbcpu <#>' AND "
90			    "'trace' ON OTHER PROCESSORS, TOO.\n");
91#endif
92			db_printf("DO NOT EVEN BOTHER REPORTING THIS WITHOUT "
93			    "INCLUDING THAT INFORMATION!\n");
94		}
95
96		db_command_loop();
97	}
98
99	db_restart_at_pc(DDB_REGS, watchpt);
100}
101