1 /* $NetBSD: db_trap.c,v 1.26 2019/03/12 07:44:58 skrll Exp $ */
2
3 /*
4 * Mach Operating System
5 * Copyright (c) 1991,1990 Carnegie Mellon University
6 * All Rights Reserved.
7 *
8 * Permission to use, copy, modify and distribute this software and its
9 * documentation is hereby granted, provided that both the copyright
10 * notice and this permission notice appear in all copies of the
11 * software, derivative works or modified versions, and any portions
12 * thereof, and that both notices appear in supporting documentation.
13 *
14 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
15 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
16 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
17 *
18 * Carnegie Mellon requests users of this software to return to
19 *
20 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
21 * School of Computer Science
22 * Carnegie Mellon University
23 * Pittsburgh PA 15213-3890
24 *
25 * any improvements or extensions that they make and grant Carnegie the
26 * rights to redistribute these changes.
27 *
28 * Author: David B. Golub, Carnegie Mellon University
29 * Date: 7/90
30 */
31
32 /*
33 * Trap entry point to kernel debugger.
34 */
35
36 #include <sys/cdefs.h>
37 __KERNEL_RCSID(0, "$NetBSD: db_trap.c,v 1.26 2019/03/12 07:44:58 skrll Exp $");
38
39 #include <sys/param.h>
40 #include <sys/proc.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
51 /*
52 * db_trap_callback can be hooked by MD port code to handle special
53 * cases such as disabling hardware watchdogs while in DDB.
54 */
55 void (*db_trap_callback)(int);
56
57 int db_trap_type;
58
59 void
db_trap(int type,int code)60 db_trap(int type, int code)
61 {
62 bool bkpt;
63 bool watchpt;
64
65 db_trap_type = type;
66
67 bkpt = IS_BREAKPOINT_TRAP(type, code);
68 watchpt = IS_WATCHPOINT_TRAP(type, code);
69
70 if (db_trap_callback)
71 db_trap_callback(1);
72
73 if (db_stop_at_pc(DDB_REGS, &bkpt)) {
74 if (db_inst_count) {
75 db_printf("After %d instructions "
76 "(%d loads, %d stores),\n",
77 db_inst_count, db_load_count, db_store_count);
78 }
79 if (bkpt)
80 db_printf("Breakpoint");
81 else if (watchpt)
82 db_printf("Watchpoint");
83 else
84 db_printf("Stopped");
85 db_printf(" in pid %d.%d (%s) at\t",
86 curproc->p_pid, curlwp->l_lid,
87 curproc->p_comm);
88 db_dot = PC_REGS(DDB_REGS);
89 db_print_loc_and_inst(db_dot);
90
91 db_command_loop();
92 }
93
94 db_restart_at_pc(DDB_REGS, watchpt);
95
96 if (db_trap_callback)
97 db_trap_callback(0);
98 }
99