1 /* $NetBSD: db_panic.c,v 1.11 2021/10/06 12:18:20 uwe Exp $ */ 2 3 /*- 4 * Copyright (c) 2000, 2002, 2006, 2007, 2009, 2013 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 26 * POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __KERNEL_RCSID(0, "$NetBSD: db_panic.c,v 1.11 2021/10/06 12:18:20 uwe Exp $"); 31 32 #include <sys/param.h> 33 #include <sys/types.h> 34 #include <sys/cpu.h> 35 36 #include <ddb/ddbvar.h> 37 #include <ddb/ddb.h> 38 39 /* 40 * db_panic: Called by panic(). May print a stack trace; may enter the 41 * kernel debugger; may just return so that panic() will continue to 42 * halt or reboot the system. 43 */ 44 void 45 db_panic(void) 46 { 47 48 if (db_dumpstack > 0) { 49 static int intrace = 0; 50 51 if (intrace == 0) { 52 intrace = 1; 53 printf("cpu%u: Begin traceback...\n", 54 cpu_index(curcpu())); 55 db_stack_trace_print( 56 (db_expr_t)(intptr_t)__builtin_frame_address(0), 57 true, db_panicstackframes, "", printf); 58 printf("cpu%u: End traceback...\n", 59 cpu_index(curcpu())); 60 intrace = 0; 61 } else 62 printf("Faulted in mid-traceback; aborting...\n"); 63 } 64 65 if (db_onpanic > 0) 66 Debugger(); 67 68 return; 69 } 70