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Annotation of sys/ddb/db_trap.c, Revision 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: }