sys/ddb/db_trap.c

   1 /*
   2  * Mach Operating System
   3  * Copyright (c) 1991,1990 Carnegie Mellon University
   4  * All Rights Reserved.
   5  *
   6  * Permission to use, copy, modify and distribute this software and its
   7  * documentation is hereby granted, provided that both the copyright
   8  * notice and this permission notice appear in all copies of the
   9  * software, derivative works or modified versions, and any portions
  10  * thereof, and that both notices appear in supporting documentation.
  11  *
  12  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS
  13  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
  14  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
  15  *
  16  * Carnegie Mellon requests users of this software to return to
  17  *
  18  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
  19  *  School of Computer Science
  20  *  Carnegie Mellon University
  21  *  Pittsburgh PA 15213-3890
  22  *
  23  * any improvements or extensions that they make and grant Carnegie the
  24  * rights to redistribute these changes.
  25  *
  26  * $FreeBSD: src/sys/ddb/db_trap.c,v 1.14 1999/08/28 00:41:11 peter Exp $
  27  * $DragonFly: src/sys/ddb/db_trap.c,v 1.4 2005/12/23 21:35:44 swildner Exp $
  28  */
  29
  30 /*
  31  *      Author: David B. Golub, Carnegie Mellon University
  32  *      Date:   7/90
  33  */
  34
  35 /*
  36  * Trap entry point to kernel debugger.
  37  */
  38 #include <sys/param.h>
  39
  40 #include <ddb/ddb.h>
  41 #include <ddb/db_command.h>
  42
  43 #include <setjmp.h>
  44
  45 extern jmp_buf  db_jmpbuf;
  46
  47 void
  48 db_trap(int type, int code)
  49 {
  50         boolean_t       bkpt;
  51         boolean_t       watchpt;
  52
  53         bkpt = IS_BREAKPOINT_TRAP(type, code);
  54         watchpt = IS_WATCHPOINT_TRAP(type, code);
  55
  56         if (db_stop_at_pc(&bkpt)) {
  57             if (db_inst_count) {
  58                 db_printf("After %d instructions (%d loads, %d stores),\n",
  59                           db_inst_count, db_load_count, db_store_count);
  60             }
  61             if (bkpt)
  62                 db_printf("Breakpoint at\t");
  63             else if (watchpt)
  64                 db_printf("Watchpoint at\t");
  65             else
  66                 db_printf("Stopped at\t");
  67             db_dot = PC_REGS(DDB_REGS);
  68             if (setjmp(db_jmpbuf) == 0)
  69                 db_print_loc_and_inst(db_dot, DDB_REGS);
  70
  71             db_command_loop();
  72         }
  73
  74         db_restart_at_pc(watchpt);
  75 }