| 1 | /*- |
| 2 | * Copyright (c) 2000, 2002, 2006, 2007, 2009, 2013 The NetBSD Foundation, Inc. |
| 3 | * All rights reserved. |
| 4 | * |
| 5 | * Redistribution and use in source and binary forms, with or without |
| 6 | * modification, are permitted provided that the following conditions |
| 7 | * are met: |
| 8 | * 1. Redistributions of source code must retain the above copyright |
| 9 | * notice, this list of conditions and the following disclaimer. |
| 10 | * 2. Redistributions in binary form must reproduce the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer in the |
| 12 | * documentation and/or other materials provided with the distribution. |
| 13 | * |
| 14 | * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS |
| 15 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
| 16 | * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| 17 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS |
| 18 | * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| 19 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| 20 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| 21 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| 22 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 23 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| 24 | * POSSIBILITY OF SUCH DAMAGE. |
| 25 | */ |
| 26 | |
| 27 | #include <sys/cdefs.h> |
| 28 | __KERNEL_RCSID(0, "$NetBSD: db_panic.c,v 1.3 2014/01/22 15:20:40 christos Exp $" ); |
| 29 | |
| 30 | #include <sys/types.h> |
| 31 | #include <sys/cpu.h> |
| 32 | |
| 33 | #include <ddb/ddbvar.h> |
| 34 | #include <ddb/ddb.h> |
| 35 | |
| 36 | /* |
| 37 | * db_panic: Called by panic(). May print a stack trace; may enter the |
| 38 | * kernel debugger; may just return so that panic() will continue to |
| 39 | * halt or reboot the system. |
| 40 | */ |
| 41 | void db_panic(void) |
| 42 | { |
| 43 | |
| 44 | if (db_onpanic == 1) |
| 45 | Debugger(); |
| 46 | else if (db_onpanic >= 0) { |
| 47 | static int intrace = 0; |
| 48 | |
| 49 | if (intrace == 0) { |
| 50 | intrace = 1; |
| 51 | printf("cpu%u: Begin traceback...\n" , |
| 52 | cpu_index(curcpu())); |
| 53 | db_stack_trace_print( |
| 54 | (db_expr_t)(intptr_t)__builtin_frame_address(0), |
| 55 | true, 65535, "" , printf); |
| 56 | printf("cpu%u: End traceback...\n" , |
| 57 | cpu_index(curcpu())); |
| 58 | intrace = 0; |
| 59 | } else |
| 60 | printf("Faulted in mid-traceback; aborting...\n" ); |
| 61 | if (db_onpanic == 2) |
| 62 | Debugger(); |
| 63 | } |
| 64 | return; |
| 65 | } |
| 66 | |