FreeBSD/Linux Kernel Cross Reference
sys/ddb/db_trap.c

     /* 
      * Mach Operating System
      * Copyright (c) 1993,1992,1991,1990 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 "AS IS"
     * 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 Mellon
     * the rights to redistribute these changes.
     */
    /*
     * HISTORY
     * $Log:        db_trap.c,v $
     * Revision 2.12  93/11/17  16:26:12  dbg
     *      ANSI-fied.
     *      [93/10/13            dbg]
     * 
     * Revision 2.11  93/01/14  17:26:00  danner
     *      64bit cleanup.
     *      [92/12/10  16:22:07  af]
     * 
     * Revision 2.10  92/08/03  17:32:15  jfriedl
     *      removed silly prototypes
     *      [92/08/02            jfriedl]
     * 
     * Revision 2.9  92/05/21  17:08:04  jfriedl
     *      tried prototypes.
     *      [92/05/20            jfriedl]
     * 
     * Revision 2.8  91/10/09  16:03:34  af
     *      Replaced db_trap function with db_task_trap, and changed
     *       db_trap to call db_task_trap with user_space parameter.
     *       db_trap exists only for backward compatibility.
     *      Passed task parameter for user space break point support.
     *      [91/08/29            tak]
     * 
     * Revision 2.7  91/05/18  14:29:20  rpd
     *      Protect against faults in db_print_loc_and_inst.
     *      [91/05/14            rpd]
     * 
     * Revision 2.6  91/05/14  15:36:39  mrt
     *      Correcting copyright
     * 
     * Revision 2.5  91/02/05  17:07:16  mrt
     *      Changed to new Mach copyright
     *      [91/01/31  16:19:35  mrt]
     * 
     * Revision 2.4  91/01/08  15:09:17  rpd
     *      Changed db_stop_at_pc's arguments.
     *      Print db_inst_count, db_load_count, db_store_count.
     *      [90/11/27            rpd]
     * 
     * Revision 2.3  90/10/25  14:44:11  rwd
     *      From rpd.
     *      [90/10/19  17:03:17  rwd]
     * 
     *      Generalized the watchpoint support.
     *      [90/10/16            rwd]
     *      Added watchpoint support.
     *      [90/10/16            rpd]
     * 
     * Revision 2.2  90/08/27  21:52:52  dbg
     *      Assign to db_dot before calling the print function.
     *      [90/08/20            af]
     *      Reduce lint.
     *      [90/08/07            dbg]
     *      Created.
     *      [90/07/25            dbg]
     * 
     */
    /*
     *      Author: David B. Golub, Carnegie Mellon University
     *      Date:   7/90
     */
    
    /*
     * Trap entry point to kernel debugger.
     */
    #include <mach/boolean.h>
    #include <machine/db_machdep.h>
    #include <ddb/db_access.h>
    #include <ddb/db_break.h>
    #include <ddb/db_command.h>
    #include <ddb/db_examine.h>
   #include <ddb/db_output.h>
   #include <ddb/db_run.h>
   #include <ddb/db_task_thread.h>
   
   
   extern int              db_inst_count;
   extern int              db_load_count;
   extern int              db_store_count;
   
   void
   db_task_trap(
           int       type,
           int       code,
           boolean_t user_space)
   {
           jmp_buf_t db_jmpbuf;
           jmp_buf_t *prev;
           boolean_t       bkpt;
           boolean_t       watchpt;
           task_t          task_space;
   
           task_space = db_target_space(current_thread(), user_space);
           bkpt = IS_BREAKPOINT_TRAP(type, code);
           watchpt = IS_WATCHPOINT_TRAP(type, code);
   
           db_init_default_thread();
           db_check_breakpoint_valid();
           if (db_stop_at_pc(&bkpt, task_space)) {
               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  ");
               else if (watchpt)
                   db_printf("Watchpoint at  ");
               else
                   db_printf("Stopped at  ");
               db_dot = PC_REGS(DDB_REGS);
   
               prev = db_recover;
               if (_setjmp(db_recover = &db_jmpbuf) == 0)
                   db_print_loc_and_inst(db_dot, task_space);
               else
                   db_printf("Trouble printing location %#X.\n", db_dot);
               db_recover = prev;
   
               db_command_loop();
           }
   
           db_restart_at_pc(watchpt, task_space);
   }
   
   void
   db_trap(
           int     type,
           int     code)
   {
           db_task_trap(type, code, !DB_VALID_KERN_ADDR(PC_REGS(DDB_REGS)));
   }

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