1 /* $OpenBSD: db_trap.c,v 1.14 2008/10/26 22:23:10 deraadt Exp $ */ 2 /* $NetBSD: db_trap.c,v 1.9 1996/02/05 01:57:18 christos Exp $ */ 3 4 /* 5 * Mach Operating System 6 * Copyright (c) 1993,1992,1991,1990 Carnegie Mellon University 7 * All Rights Reserved. 8 * 9 * Permission to use, copy, modify and distribute this software and its 10 * documentation is hereby granted, provided that both the copyright 11 * notice and this permission notice appear in all copies of the 12 * software, derivative works or modified versions, and any portions 13 * thereof, and that both notices appear in supporting documentation. 14 * 15 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 16 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR 17 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 18 * 19 * Carnegie Mellon requests users of this software to return to 20 * 21 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU 22 * School of Computer Science 23 * Carnegie Mellon University 24 * Pittsburgh PA 15213-3890 25 * 26 * any improvements or extensions that they make and grant Carnegie Mellon 27 * the rights to redistribute these changes. 28 * 29 * Author: David B. Golub, Carnegie Mellon University 30 * Date: 7/90 31 */ 32 33 /* 34 * Trap entry point to kernel debugger. 35 */ 36 #include <sys/param.h> 37 #include <sys/proc.h> 38 #include <sys/systm.h> 39 40 #include <uvm/uvm_extern.h> 41 42 #include <machine/db_machdep.h> 43 44 #include <ddb/db_run.h> 45 #include <ddb/db_command.h> 46 #include <ddb/db_break.h> 47 #include <ddb/db_output.h> 48 #include <ddb/db_sym.h> 49 #include <ddb/db_extern.h> 50 #include <ddb/db_interface.h> 51 52 void 53 db_trap(int type, int code) 54 { 55 boolean_t bkpt; 56 boolean_t watchpt; 57 58 bkpt = IS_BREAKPOINT_TRAP(type, code); 59 watchpt = IS_WATCHPOINT_TRAP(type, code); 60 61 if (db_stop_at_pc(DDB_REGS, &bkpt)) { 62 if (db_inst_count) { 63 db_printf("After %d instructions ", db_inst_count); 64 db_printf("(%d loads, %d stores),\n", db_load_count, 65 db_store_count); 66 } 67 if (bkpt) 68 db_printf("Breakpoint at\t"); 69 else if (watchpt) 70 db_printf("Watchpoint at\t"); 71 else 72 db_printf("Stopped at\t"); 73 db_dot = PC_REGS(DDB_REGS); 74 db_print_loc_and_inst(db_dot); 75 76 /* 77 * Just in case we do not have any usable console driver, 78 * give the user a traceback. 79 */ 80 if (cold) { 81 db_stack_trace_print(db_dot, 0, 10 /* arbitrary */, "", 82 db_printf); 83 } 84 85 if (panicstr != NULL) { 86 if (db_print_position() != 0) 87 db_printf("\n"); 88 db_printf("RUN AT LEAST 'trace' AND 'ps' AND INCLUDE " 89 "OUTPUT WHEN REPORTING THIS PANIC!\n"); 90 #ifdef MULTIPROCESSOR 91 db_printf("IF RUNNING SMP, USE 'mach ddbcpu <#>' AND " 92 "'trace' ON OTHER PROCESSORS, TOO.\n"); 93 #endif 94 db_printf("DO NOT EVEN BOTHER REPORTING THIS WITHOUT " 95 "INCLUDING THAT INFORMATION!\n"); 96 } 97 98 db_command_loop(); 99 } 100 101 db_restart_at_pc(DDB_REGS, watchpt); 102 } 103