sys/ddb/db_trap.c

/*
 * Mach Operating System
 * Copyright (c) 1991,1990 Carnegie Mellon University
 * All Rights Reserved.
 *
 * Permission to use, copy, modify and distribute this software and its
 * documentation is hereby granted, provided that both the copyright
 * notice and this permission notice appear in all copies of the
 * software, derivative works or modified versions, and any portions
 * thereof, and that both notices appear in supporting documentation.
 *
 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS
 * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
 *
 * Carnegie Mellon requests users of this software to return to
 *
 *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
 *  School of Computer Science
 *  Carnegie Mellon University
 *  Pittsburgh PA 15213-3890
 *
 * any improvements or extensions that they make and grant Carnegie the
 * rights to redistribute these changes.
 *
 *      $Id: db_trap.c,v 1.2 1993/10/16 16:47:28 rgrimes Exp $
 */

/*
 *      Author: David B. Golub, Carnegie Mellon University
 *      Date:   7/90
 */

/*
 * Trap entry point to kernel debugger.
 */
#include "param.h"
#include "systm.h"
#include "proc.h"
#include "ddb/ddb.h"
#include <ddb/db_command.h>
#include <ddb/db_break.h>

extern void             db_restart_at_pc();
extern boolean_t        db_stop_at_pc();

extern int              db_inst_count;
extern int              db_load_count;
extern int              db_store_count;

void
db_trap(type, code)
        int     type, code;
{
        boolean_t       bkpt;
        boolean_t       watchpt;

        bkpt = IS_BREAKPOINT_TRAP(type, code);
        watchpt = IS_WATCHPOINT_TRAP(type, code);

        if (db_stop_at_pc(&bkpt)) {
            if (db_inst_count) {
                db_printf("After %d instructions (%d loads, %d stores),\n",
                          db_inst_count, db_load_count, db_store_count);
            }
            if (bkpt)
                db_printf("Breakpoint at\t");
            else if (watchpt)
                db_printf("Watchpoint at\t");
            else
                db_printf("Stopped at\t");
            db_dot = PC_REGS(DDB_REGS);
            db_print_loc_and_inst(db_dot);

            db_command_loop();
        }

        db_restart_at_pc(watchpt);
}