1/* $NetBSD: db_trap.c,v 1.26 2019/03/12 07:44:58 skrll 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 1.26 2019/03/12 07:44:58 skrll 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 */ 55void (*db_trap_callback)(int); 56 57int db_trap_type; 58 59void 60db_trap(int type, int code) 61{ 62 bool bkpt; 63 bool watchpt; 64 65 db_trap_type = type; 66 67 bkpt = IS_BREAKPOINT_TRAP(type, code); 68 watchpt = IS_WATCHPOINT_TRAP(type, code); 69 70 if (db_trap_callback) 71 db_trap_callback(1); 72 73 if (db_stop_at_pc(DDB_REGS, &bkpt)) { 74 if (db_inst_count) { 75 db_printf("After %d instructions " 76 "(%d loads, %d stores),\n", 77 db_inst_count, db_load_count, db_store_count); 78 } 79 if (bkpt) 80 db_printf("Breakpoint"); 81 else if (watchpt) 82 db_printf("Watchpoint"); 83 else 84 db_printf("Stopped"); 85 db_printf(" in pid %d.%d (%s) at\t", 86 curproc->p_pid, curlwp->l_lid, 87 curproc->p_comm); 88 db_dot = PC_REGS(DDB_REGS); 89 db_print_loc_and_inst(db_dot); 90 91 db_command_loop(); 92 } 93 94 db_restart_at_pc(DDB_REGS, watchpt); 95 96 if (db_trap_callback) 97 db_trap_callback(0); 98} 99