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Annotation of sys/ddb/db_trap.c, Revision 1.1.1.1

1.1       nbrk        1: /*     $OpenBSD: db_trap.c,v 1.13 2007/06/04 17:03:04 miod 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/proc.h>
                     38: #include <sys/systm.h>
                     39:
                     40: #include <uvm/uvm_extern.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: #include <ddb/db_interface.h>
                     51:
                     52: void
                     53: db_trap(int type, int code)
                     54: {
                     55:        boolean_t       bkpt;
                     56:        boolean_t       watchpt;
                     57:
                     58:        bkpt = IS_BREAKPOINT_TRAP(type, code);
                     59:        watchpt = IS_WATCHPOINT_TRAP(type, code);
                     60:
                     61:        if (db_stop_at_pc(DDB_REGS, &bkpt)) {
                     62:                if (db_inst_count) {
                     63:                        db_printf("After %d instructions ", db_inst_count);
                     64:                        db_printf("(%d loads, %d stores),\n", db_load_count,
                     65:                            db_store_count);
                     66:                }
                     67:                if (bkpt)
                     68:                        db_printf("Breakpoint at\t");
                     69:                else if (watchpt)
                     70:                        db_printf("Watchpoint at\t");
                     71:                else
                     72:                        db_printf("Stopped at\t");
                     73:                db_dot = PC_REGS(DDB_REGS);
                     74:                db_print_loc_and_inst(db_dot);
                     75:
                     76:                /*
                     77:                 * Just in case we do not have any usable console driver,
                     78:                 * give the user a traceback.
                     79:                 */
                     80:                if (cold) {
                     81:                        db_stack_trace_print(db_dot, 0, 10 /* arbitrary */, "",
                     82:                            db_printf);
                     83:                }
                     84:
                     85:                if (panicstr != NULL) {
                     86:                        if (db_print_position() != 0)
                     87:                                db_printf("\n");
                     88:                        db_printf("RUN AT LEAST 'trace' AND 'ps' AND INCLUDE "
                     89:                            "OUTPUT WHEN REPORTING THIS PANIC!\n");
                     90:                        db_printf("DO NOT EVEN BOTHER REPORTING THIS WITHOUT "
                     91:                            "INCLUDING THAT INFORMATION!\n");
                     92:                }
                     93:
                     94:                db_command_loop();
                     95:        }
                     96:
                     97:        db_restart_at_pc(DDB_REGS, watchpt);
                     98: }