| 1 | /* $NetBSD: db_trap.c,v 1.25 2011/02/09 18:24:44 matt 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 1.25 2011/02/09 18:24:44 matt 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 | int db_trap_type; |
| 58 | |
| 59 | void |
| 60 | db_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) db_trap_callback(1); |
| 71 | |
| 72 | if (db_stop_at_pc(DDB_REGS, &bkpt)) { |
| 73 | if (db_inst_count) { |
| 74 | db_printf("After %d instructions " |
| 75 | "(%d loads, %d stores),\n" , |
| 76 | db_inst_count, db_load_count, db_store_count); |
| 77 | } |
| 78 | if (bkpt) |
| 79 | db_printf("Breakpoint" ); |
| 80 | else if (watchpt) |
| 81 | db_printf("Watchpoint" ); |
| 82 | else |
| 83 | db_printf("Stopped" ); |
| 84 | db_printf(" in pid %d.%d (%s) at\t" , |
| 85 | curproc->p_pid, curlwp->l_lid, |
| 86 | curproc->p_comm); |
| 87 | db_dot = PC_REGS(DDB_REGS); |
| 88 | db_print_loc_and_inst(db_dot); |
| 89 | |
| 90 | db_command_loop(); |
| 91 | } |
| 92 | |
| 93 | db_restart_at_pc(DDB_REGS, watchpt); |
| 94 | |
| 95 | if (db_trap_callback) |
| 96 | db_trap_callback(0); |
| 97 | } |
| 98 | |