1 /* $NetBSD: db_trap.c,v 1.18 2001/11/12 22:54:07 lukem Exp $ */ 2 3 /* 4 * Mach Operating System 5 * Copyright (c) 1991,1990 Carnegie Mellon University 6 * All Rights Reserved. 7 * 8 * Permission to use, copy, modify and distribute this software and its 9 * documentation is hereby granted, provided that both the copyright 10 * notice and this permission notice appear in all copies of the 11 * software, derivative works or modified versions, and any portions 12 * thereof, and that both notices appear in supporting documentation. 13 * 14 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 15 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR 16 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 17 * 18 * Carnegie Mellon requests users of this software to return to 19 * 20 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU 21 * School of Computer Science 22 * Carnegie Mellon University 23 * Pittsburgh PA 15213-3890 24 * 25 * any improvements or extensions that they make and grant Carnegie the 26 * rights to redistribute these changes. 27 * 28 * Author: David B. Golub, Carnegie Mellon University 29 * Date: 7/90 30 */ 31 32 /* 33 * Trap entry point to kernel debugger. 34 */ 35 36 #include <sys/cdefs.h> 37 __KERNEL_RCSID(0, "$NetBSD: db_trap.c,v 1.18 2001/11/12 22:54:07 lukem Exp $"); 38 39 #include <sys/param.h> 40 #include <sys/proc.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 51 /* 52 * db_trap_callback can be hooked by MD port code to handle special 53 * cases such as disabling hardware watchdogs while in DDB. 54 */ 55 void (*db_trap_callback)(int); 56 57 void 58 db_trap(type, code) 59 int type, code; 60 { 61 boolean_t bkpt; 62 boolean_t watchpt; 63 64 bkpt = IS_BREAKPOINT_TRAP(type, code); 65 watchpt = IS_WATCHPOINT_TRAP(type, code); 66 67 if (db_trap_callback) db_trap_callback(1); 68 69 if (db_stop_at_pc(DDB_REGS, &bkpt)) { 70 if (db_inst_count) { 71 db_printf("After %d instructions (%d loads, %d stores),\n", 72 db_inst_count, db_load_count, db_store_count); 73 } 74 if (curproc != NULL) { 75 if (bkpt) 76 db_printf("Breakpoint"); 77 else if (watchpt) 78 db_printf("Watchpoint"); 79 else 80 db_printf("Stopped"); 81 db_printf(" in pid %d (%s) at\t", curproc->p_pid, 82 curproc->p_comm); 83 } else if (bkpt) 84 db_printf("Breakpoint at\t"); 85 else if (watchpt) 86 db_printf("Watchpoint at\t"); 87 else 88 db_printf("Stopped at\t"); 89 db_dot = PC_REGS(DDB_REGS); 90 db_print_loc_and_inst(db_dot); 91 92 db_command_loop(); 93 } 94 95 db_restart_at_pc(DDB_REGS, watchpt); 96 97 if (db_trap_callback) db_trap_callback(0); 98 } 99