1 /* $NetBSD: db_trap.c,v 1.5 1994/06/29 06:31:22 cgd 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 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 #include <sys/param.h> 36 #include <sys/proc.h> 37 38 #include <ddb/db_command.h> 39 #include <ddb/db_break.h> 40 41 #include <setjmp.h> 42 43 extern void db_restart_at_pc(); 44 extern boolean_t db_stop_at_pc(); 45 46 extern int db_inst_count; 47 extern int db_load_count; 48 extern int db_store_count; 49 50 extern jmp_buf *db_recover; 51 52 db_trap(type, code) 53 int type, code; 54 { 55 boolean_t bkpt; 56 boolean_t watchpt; 57 jmp_buf db_jmpbuf; 58 jmp_buf *savejmp = db_recover; 59 60 bkpt = IS_BREAKPOINT_TRAP(type, code); 61 watchpt = IS_WATCHPOINT_TRAP(type, code); 62 63 if (db_stop_at_pc(&bkpt)) { 64 if (db_inst_count) { 65 db_printf("After %d instructions (%d loads, %d stores),\n", 66 db_inst_count, db_load_count, db_store_count); 67 } 68 if (bkpt) 69 db_printf("Breakpoint at\t"); 70 else if (watchpt) 71 db_printf("Watchpoint at\t"); 72 else 73 db_printf("Stopped at\t"); 74 db_dot = PC_REGS(DDB_REGS); 75 if (!setjmp(*(db_recover = &db_jmpbuf))) 76 db_print_loc_and_inst(db_dot); 77 78 db_command_loop(); 79 } 80 81 db_restart_at_pc(watchpt); 82 } 83