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db_panic.c revision 1.6 
      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 1.6 2017/12/28 17:51:19 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, db_panicstackframes, "", 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