FreeBSD/Linux Kernel Cross Reference
sys/ddb/db_trap.c
1 /* $OpenBSD: db_trap.c,v 1.30 2019/11/06 07:30:08 mpi 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/systm.h>
38
39 #include <machine/db_machdep.h>
40
41 #include <ddb/db_run.h>
42 #include <ddb/db_command.h>
43 #include <ddb/db_output.h>
44 #include <ddb/db_sym.h>
45 #include <ddb/db_extern.h>
46 #include <ddb/db_interface.h>
47 #include <ddb/db_var.h>
48
49 void
50 db_trap(int type, int code)
51 {
52 int bkpt;
53 int watchpt;
54
55 bkpt = IS_BREAKPOINT_TRAP(type, code);
56 watchpt = IS_WATCHPOINT_TRAP(type, code);
57
58 if (db_stop_at_pc(&ddb_regs, &bkpt)) {
59 if (db_inst_count) {
60 db_printf("After %d instructions\n", db_inst_count);
61 }
62 if (bkpt)
63 db_printf("Breakpoint at\t");
64 else if (watchpt)
65 db_printf("Watchpoint at\t");
66 else
67 db_printf("Stopped at\t");
68 db_dot = PC_REGS(&ddb_regs);
69 db_print_loc_and_inst(db_dot);
70
71 if (panicstr != NULL) {
72 static int ddb_msg_shown;
73
74 if (! ddb_msg_shown) {
75 /* show on-proc threads */
76 db_show_all_procs(0, 0, 0, "o");
77 }
78 /* then the backtrace */
79 db_stack_trace_print(db_dot, 0, 14 /* arbitrary */, "",
80 db_printf);
81
82 if (db_print_position() != 0)
83 db_printf("\n");
84 if (! ddb_msg_shown) {
85 db_printf(
86 "https://www.openbsd.org/ddb.html describes the minimum info required in bug\n"
87 "reports. Insufficient info makes it difficult to find and fix bugs.\n");
88 ddb_msg_shown = 1;
89 }
90 }
91
92 db_command_loop();
93 }
94
95 db_restart_at_pc(&ddb_regs, watchpt);
96 }
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