sys/ddb/db_trap.c

   1 /*      $NetBSD: db_trap.c,v 1.23 2005/12/11 12:20:53 christos Exp $    */
   2
   3 /*
   4  * Mach Operating System
   5  * Copyright (c) 1991,1990 Carnegie Mellon University
   6  * All Rights Reserved.
   7  *
   8  * Permission to use, copy, modify and distribute this software and its
   9  * documentation is hereby granted, provided that both the copyright
  10  * notice and this permission notice appear in all copies of the
  11  * software, derivative works or modified versions, and any portions
  12  * thereof, and that both notices appear in supporting documentation.
  13  *
  14  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
  15  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
  16  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
  17  *
  18  * Carnegie Mellon requests users of this software to return to
  19  *
  20  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
  21  *  School of Computer Science
  22  *  Carnegie Mellon University
  23  *  Pittsburgh PA 15213-3890
  24  *
  25  * any improvements or extensions that they make and grant Carnegie the
  26  * rights to redistribute these changes.
  27  *
  28  *      Author: David B. Golub, Carnegie Mellon University
  29  *      Date:   7/90
  30  */
  31
  32 /*
  33  * Trap entry point to kernel debugger.
  34  */
  35
  36 #include <sys/cdefs.h>
  37 __KERNEL_RCSID(0, "$NetBSD: db_trap.c,v 1.23 2005/12/11 12:20:53 christos Exp $");
  38
  39 #include <sys/param.h>
  40 #include <sys/proc.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
  51 /*
  52  * db_trap_callback can be hooked by MD port code to handle special
  53  * cases such as disabling hardware watchdogs while in DDB.
  54  */
  55 void (*db_trap_callback)(int);
  56
  57 int db_trap_type;
  58
  59 void
  60 db_trap(int type, int code)
  61 {
  62         bool    bkpt;
  63         bool    watchpt;
  64
  65         db_trap_type = type;
  66
  67         bkpt = IS_BREAKPOINT_TRAP(type, code);
  68         watchpt = IS_WATCHPOINT_TRAP(type, code);
  69
  70         if (db_trap_callback) db_trap_callback(1);
  71
  72         if (db_stop_at_pc(DDB_REGS, &bkpt)) {
  73                 if (db_inst_count) {
  74                         db_printf("After %d instructions "
  75                             "(%d loads, %d stores),\n",
  76                             db_inst_count, db_load_count, db_store_count);
  77                 }
  78                 if (curlwp != NULL) {
  79                         if (bkpt)
  80                                 db_printf("Breakpoint");
  81                         else if (watchpt)
  82                                 db_printf("Watchpoint");
  83                         else
  84                                 db_printf("Stopped");
  85                         if (curproc == NULL)
  86                                 db_printf("; curlwp = %p,"
  87                                     " curproc is NULL at\t", curlwp);
  88                         else
  89                                 db_printf(" in pid %d.%d (%s) at\t",
  90                                     curproc->p_pid, curlwp->l_lid,
  91                                     curproc->p_comm);
  92                 } else if (bkpt)
  93                         db_printf("Breakpoint at\t");
  94                 else if (watchpt)
  95                         db_printf("Watchpoint at\t");
  96                 else
  97                         db_printf("Stopped at\t");
  98                 db_dot = PC_REGS(DDB_REGS);
  99                 db_print_loc_and_inst(db_dot);
 100
 101                 db_command_loop();
 102         }
 103
 104         db_restart_at_pc(DDB_REGS, watchpt);
 105
 106         if (db_trap_callback)
 107                 db_trap_callback(0);
 108 }