1 /* $OpenBSD: db_trap.c,v 1.13 2007/06/04 17:03:04 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
52 void
53 db_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 ", db_inst_count);
64 db_printf("(%d loads, %d stores),\n", db_load_count,
65 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 db_print_loc_and_inst(db_dot);
75
76 /*
77 * Just in case we do not have any usable console driver,
78 * give the user a traceback.
79 */
80 if (cold) {
81 db_stack_trace_print(db_dot, 0, 10 /* arbitrary */, "",
82 db_printf);
83 }
84
85 if (panicstr != NULL) {
86 if (db_print_position() != 0)
87 db_printf("\n");
88 db_printf("RUN AT LEAST 'trace' AND 'ps' AND INCLUDE "
89 "OUTPUT WHEN REPORTING THIS PANIC!\n");
90 db_printf("DO NOT EVEN BOTHER REPORTING THIS WITHOUT "
91 "INCLUDING THAT INFORMATION!\n");
92 }
93
94 db_command_loop();
95 }
96
97 db_restart_at_pc(DDB_REGS, watchpt);
98 }