1 /* $OpenBSD: db_trap.c,v 1.30 2019/11/06 07:30:08 mpi 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/systm.h> 38 39 #include <machine/db_machdep.h> 40 41 #include <ddb/db_run.h> 42 #include <ddb/db_command.h> 43 #include <ddb/db_output.h> 44 #include <ddb/db_sym.h> 45 #include <ddb/db_extern.h> 46 #include <ddb/db_interface.h> 47 #include <ddb/db_var.h> 48 49 void 50 db_trap(int type, int code) 51 { 52 int bkpt; 53 int watchpt; 54 55 bkpt = IS_BREAKPOINT_TRAP(type, code); 56 watchpt = IS_WATCHPOINT_TRAP(type, code); 57 58 if (db_stop_at_pc(&ddb_regs, &bkpt)) { 59 if (db_inst_count) { 60 db_printf("After %d instructions\n", db_inst_count); 61 } 62 if (bkpt) 63 db_printf("Breakpoint at\t"); 64 else if (watchpt) 65 db_printf("Watchpoint at\t"); 66 else 67 db_printf("Stopped at\t"); 68 db_dot = PC_REGS(&ddb_regs); 69 db_print_loc_and_inst(db_dot); 70 71 if (panicstr != NULL) { 72 static int ddb_msg_shown; 73 74 if (! ddb_msg_shown) { 75 /* show on-proc threads */ 76 db_show_all_procs(0, 0, 0, "o"); 77 } 78 /* then the backtrace */ 79 db_stack_trace_print(db_dot, 0, 14 /* arbitrary */, "", 80 db_printf); 81 82 if (db_print_position() != 0) 83 db_printf("\n"); 84 if (! ddb_msg_shown) { 85 db_printf( 86 "https://www.openbsd.org/ddb.html describes the minimum info required in bug\n" 87 "reports. Insufficient info makes it difficult to find and fix bugs.\n"); 88 ddb_msg_shown = 1; 89 } 90 } 91 92 db_command_loop(); 93 } 94 95 db_restart_at_pc(&ddb_regs, watchpt); 96 } 97