1 | /* $NetBSD: db_trap.c,v 1.25 2011/02/09 18:24:44 matt 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 1.25 2011/02/09 18:24:44 matt 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 |
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) db_trap_callback(1); |
71 | |
72 | if (db_stop_at_pc(DDB_REGS, &bkpt)) { |
73 | if (db_inst_count) { |
74 | db_printf("After %d instructions " |
75 | "(%d loads, %d stores),\n" , |
76 | db_inst_count, db_load_count, db_store_count); |
77 | } |
78 | if (bkpt) |
79 | db_printf("Breakpoint" ); |
80 | else if (watchpt) |
81 | db_printf("Watchpoint" ); |
82 | else |
83 | db_printf("Stopped" ); |
84 | db_printf(" in pid %d.%d (%s) at\t" , |
85 | curproc->p_pid, curlwp->l_lid, |
86 | curproc->p_comm); |
87 | db_dot = PC_REGS(DDB_REGS); |
88 | db_print_loc_and_inst(db_dot); |
89 | |
90 | db_command_loop(); |
91 | } |
92 | |
93 | db_restart_at_pc(DDB_REGS, watchpt); |
94 | |
95 | if (db_trap_callback) |
96 | db_trap_callback(0); |
97 | } |
98 | |