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