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db_panic.c revision 1.3.4.2 
      1  1.3.4.2  yamt /*-
      2  1.3.4.2  yamt  * Copyright (c) 2000, 2002, 2006, 2007, 2009, 2013 The NetBSD Foundation, Inc.
      3  1.3.4.2  yamt  * All rights reserved.
      4  1.3.4.2  yamt  *
      5  1.3.4.2  yamt  * Redistribution and use in source and binary forms, with or without
      6  1.3.4.2  yamt  * modification, are permitted provided that the following conditions
      7  1.3.4.2  yamt  * are met:
      8  1.3.4.2  yamt  * 1. Redistributions of source code must retain the above copyright
      9  1.3.4.2  yamt  *    notice, this list of conditions and the following disclaimer.
     10  1.3.4.2  yamt  * 2. Redistributions in binary form must reproduce the above copyright
     11  1.3.4.2  yamt  *    notice, this list of conditions and the following disclaimer in the
     12  1.3.4.2  yamt  *    documentation and/or other materials provided with the distribution.
     13  1.3.4.2  yamt  *
     14  1.3.4.2  yamt  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     15  1.3.4.2  yamt  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     16  1.3.4.2  yamt  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     17  1.3.4.2  yamt  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     18  1.3.4.2  yamt  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     19  1.3.4.2  yamt  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     20  1.3.4.2  yamt  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     21  1.3.4.2  yamt  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     22  1.3.4.2  yamt  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     23  1.3.4.2  yamt  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     24  1.3.4.2  yamt  * POSSIBILITY OF SUCH DAMAGE.
     25  1.3.4.2  yamt  */
     26  1.3.4.2  yamt 
     27  1.3.4.2  yamt #include <sys/cdefs.h>
     28  1.3.4.2  yamt __KERNEL_RCSID(0, "$NetBSD: db_panic.c,v 1.3.4.2 2014/05/22 11:40:19 yamt Exp $");
     29  1.3.4.2  yamt 
     30  1.3.4.2  yamt #include <sys/types.h>
     31  1.3.4.2  yamt #include <sys/cpu.h>
     32  1.3.4.2  yamt 
     33  1.3.4.2  yamt #include <ddb/ddbvar.h>
     34  1.3.4.2  yamt #include <ddb/ddb.h>
     35  1.3.4.2  yamt 
     36  1.3.4.2  yamt /*
     37  1.3.4.2  yamt  * db_panic: Called by panic().  May print a stack trace; may enter the
     38  1.3.4.2  yamt  * kernel debugger; may just return so that panic() will continue to
     39  1.3.4.2  yamt  * halt or reboot the system.
     40  1.3.4.2  yamt  */
     41  1.3.4.2  yamt void db_panic(void)
     42  1.3.4.2  yamt {
     43  1.3.4.2  yamt 
     44  1.3.4.2  yamt 	if (db_onpanic == 1)
     45  1.3.4.2  yamt 		Debugger();
     46  1.3.4.2  yamt 	else if (db_onpanic >= 0) {
     47  1.3.4.2  yamt 		static int intrace = 0;
     48  1.3.4.2  yamt 
     49  1.3.4.2  yamt 		if (intrace == 0) {
     50  1.3.4.2  yamt 			intrace = 1;
     51  1.3.4.2  yamt 			printf("cpu%u: Begin traceback...\n",
     52  1.3.4.2  yamt 			    cpu_index(curcpu()));
     53  1.3.4.2  yamt 			db_stack_trace_print(
     54  1.3.4.2  yamt 			    (db_expr_t)(intptr_t)__builtin_frame_address(0),
     55  1.3.4.2  yamt 			    true, 65535, "", printf);
     56  1.3.4.2  yamt 			printf("cpu%u: End traceback...\n",
     57  1.3.4.2  yamt 			    cpu_index(curcpu()));
     58  1.3.4.2  yamt 			intrace = 0;
     59  1.3.4.2  yamt 		} else
     60  1.3.4.2  yamt 			printf("Faulted in mid-traceback; aborting...\n");
     61  1.3.4.2  yamt 		if (db_onpanic == 2)
     62  1.3.4.2  yamt 			Debugger();
     63  1.3.4.2  yamt 	}
     64  1.3.4.2  yamt 	return;
     65  1.3.4.2  yamt }
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