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      1 /*	$NetBSD: db_panic.c,v 1.12 2023/11/21 14:35:01 riastradh 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 1.12 2023/11/21 14:35:01 riastradh 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_ra(
     56 			    (db_expr_t)(intptr_t)__builtin_return_address(0),
     57 			    true,
     58 			    (db_expr_t)(intptr_t)__builtin_frame_address(0),
     59 			    true, db_panicstackframes, "", printf);
     60 			printf("cpu%u: End traceback...\n",
     61 			    cpu_index(curcpu()));
     62 			intrace = 0;
     63 		} else
     64 			printf("Faulted in mid-traceback; aborting...\n");
     65 	}
     66 
     67 	if (db_onpanic > 0)
     68 		Debugger();
     69 
     70 	return;
     71 }
     72