Line data    Source code

       1             : /*      $OpenBSD: db_trap.c,v 1.28 2017/01/09 17:58:44 mpi 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/systm.h>
      38             : 
      39             : #include <machine/db_machdep.h>
      40             : 
      41             : #include <ddb/db_run.h>
      42             : #include <ddb/db_command.h>
      43             : #include <ddb/db_output.h>
      44             : #include <ddb/db_sym.h>
      45             : #include <ddb/db_extern.h>
      46             : #include <ddb/db_interface.h>
      47             : #include <ddb/db_var.h>
      48             : 
      49             : void
      50           0 : db_trap(int type, int code)
      51             : {
      52           0 :         boolean_t       bkpt;
      53             :         boolean_t       watchpt;
      54             : 
      55           0 :         db_is_active = 1;
      56           0 :         bkpt = IS_BREAKPOINT_TRAP(type, code);
      57           0 :         watchpt = IS_WATCHPOINT_TRAP(type, code);
      58             : 
      59           0 :         if (db_stop_at_pc(&ddb_regs, &bkpt)) {
      60           0 :                 if (db_inst_count) {
      61           0 :                         db_printf("After %d instructions\n", db_inst_count);
      62           0 :                 }
      63           0 :                 if (bkpt)
      64           0 :                         db_printf("Breakpoint at\t");
      65           0 :                 else if (watchpt)
      66           0 :                         db_printf("Watchpoint at\t");
      67             :                 else
      68           0 :                         db_printf("Stopped at\t");
      69           0 :                 db_dot = PC_REGS(&ddb_regs);
      70           0 :                 db_print_loc_and_inst(db_dot);
      71             : 
      72           0 :                 if (panicstr != NULL) {
      73             :                         static int ddb_msg_shown;
      74             : 
      75           0 :                         if (! ddb_msg_shown) {
      76             :                                 /* show on-proc threads */
      77           0 :                                 db_show_all_procs(0, 0, 0, "o");
      78           0 :                         }
      79             :                         /* then the backtrace */
      80           0 :                         db_stack_trace_print(db_dot, 0, 14 /* arbitrary */, "",
      81             :                             db_printf);
      82             : 
      83           0 :                         if (db_print_position() != 0)
      84           0 :                                 db_printf("\n");
      85           0 :                         if (! ddb_msg_shown) {
      86           0 :                                 db_printf(
      87             : "https://www.openbsd.org/ddb.html describes the minimum info required in bug\n"
      88             : "reports.  Insufficient info makes it difficult to find and fix bugs.\n");
      89           0 :                                 ddb_msg_shown = 1;
      90           0 :                         }
      91             :                 }
      92             : 
      93           0 :                 db_command_loop();
      94           0 :         }
      95             : 
      96           0 :         db_restart_at_pc(&ddb_regs, watchpt);
      97           0 :         db_is_active = 0;
      98           0 : }