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db_panic.c revision 1.1 
      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 1.1 2013/02/10 11:04:20 apb Exp $");
     29 
     30 #include <sys/cpu.h>
     31 
     32 #include <ddb/ddbvar.h>
     33 #include <ddb/ddb.h>
     34 
     35 /*
     36  * db_panic: Called by panic().  May print a stack trace; may enter the
     37  * kernel debugger; may just return so that panic() will continue to
     38  * halt or reboot the system.
     39  */
     40 void db_panic(void)
     41 {
     42 
     43 	if (db_onpanic == 1)
     44 		Debugger();
     45 	else if (db_onpanic >= 0) {
     46 		static int intrace = 0;
     47 
     48 		if (intrace == 0) {
     49 			intrace = 1;
     50 			printf("cpu%u: Begin traceback...\n",
     51 			    cpu_index(curcpu()));
     52 			db_stack_trace_print(
     53 			    (db_expr_t)(intptr_t)__builtin_frame_address(0),
     54 			    true, 65535, "", printf);
     55 			printf("cpu%u: End traceback...\n",
     56 			    cpu_index(curcpu()));
     57 			intrace = 0;
     58 		} else
     59 			printf("Faulted in mid-traceback; aborting...");
     60 		if (db_onpanic == 2)
     61 			Debugger();
     62 	}
     63 	return;
     64 }
     65