sys/ddb/db_trap.c

   1 /*      $OpenBSD: db_trap.c,v 1.16 2011/04/03 16:46:19 drahn 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 #include <ddb/db_var.h>
  52
  53 void
  54 db_trap(int type, int code)
  55 {
  56         boolean_t       bkpt;
  57         boolean_t       watchpt;
  58
  59         db_is_active = 1;
  60         bkpt = IS_BREAKPOINT_TRAP(type, code);
  61         watchpt = IS_WATCHPOINT_TRAP(type, code);
  62
  63         if (db_stop_at_pc(DDB_REGS, &bkpt)) {
  64                 if (db_inst_count) {
  65                         db_printf("After %d instructions\n", db_inst_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 #ifdef MULTIPROCESSOR
  91                         db_printf("IF RUNNING SMP, USE 'mach ddbcpu <#>' AND "
  92                             "'trace' ON OTHER PROCESSORS, TOO.\n");
  93 #endif
  94                         db_printf("DO NOT EVEN BOTHER REPORTING THIS WITHOUT "
  95                             "INCLUDING THAT INFORMATION!\n");
  96                 }
  97
  98                 db_command_loop();
  99         }
 100
 101         db_restart_at_pc(DDB_REGS, watchpt);
 102         db_is_active = 0;
 103 }