FreeBSD/Linux Kernel Cross Reference
sys/ddb/db_write_cmd.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_write_cmd.c,v $
     * Revision 2.11  93/11/17  16:27:12  dbg
     *      ANSI-fied.
     *      [93/10/13            dbg]
     * 
     * Revision 2.10  93/01/14  17:26:21  danner
     *      64bit cleanup.
     *      [92/11/30            af]
     * 
     * Revision 2.9  92/08/03  17:32:36  jfriedl
     *      removed silly prototypes
     *      [92/08/02            jfriedl]
     * 
     * Revision 2.8  92/05/21  17:08:21  jfriedl
     *      Removed unused variable 'p' from db_write_cmd().
     *      [92/05/16            jfriedl]
     * 
     * Revision 2.7  92/05/04  11:24:18  danner
     *      Reorganized. w/u now works, instead of just w/tu. 
     *      [92/04/18            danner]
     * 
     * Revision 2.6  91/10/09  16:05:06  af
     *      Added user space write support including inactive task.
     *      [91/08/29            tak]
     * 
     * Revision 2.5  91/05/14  15:38:04  mrt
     *      Correcting copyright
     * 
     * Revision 2.4  91/02/05  17:07:35  mrt
     *      Changed to new Mach copyright
     *      [91/01/31  16:20:19  mrt]
     * 
     * Revision 2.3  90/10/25  14:44:26  rwd
     *      Changed db_write_cmd to print unsigned.
     *      [90/10/19            rpd]
     * 
     * Revision 2.2  90/08/27  21:53:54  dbg
     *      Set db_prev and db_next instead of explicitly advancing dot.
     *      [90/08/22            dbg]
     *      Reflected changes in db_printsym()'s calling seq.
     *      [90/08/20            af]
     *      Warn user if nothing was written.
     *      [90/08/07            dbg]
     *      Created.
     *      [90/07/25            dbg]
     * 
     */
    /*
     *      Author: David B. Golub,  Carnegie Mellon University
     *      Date:   7/90
     */
    
    #include <mach/boolean.h>
    #include <kern/task.h>
    #include <kern/thread.h>
    
    #include <machine/db_machdep.h>
    
    #include <ddb/db_lex.h>
    #include <ddb/db_access.h>
    #include <ddb/db_command.h>
    #include <ddb/db_examine.h>
    #include <ddb/db_output.h>
    #include <ddb/db_sym.h>
    #include <ddb/db_task_thread.h>
    
    
    
    /*
     * Write to file.
     */
    /*ARGSUSED*/
   void
   db_write_cmd(
           db_expr_t       address,
           boolean_t       have_addr,
           db_expr_t       count,
           char *          modif)
   {
           register db_addr_t      addr;
           register db_expr_t      old_value;
           db_expr_t       new_value;
           register int    size;
           boolean_t       wrote_one = FALSE;
           boolean_t       t_opt, u_opt;
           thread_t        thread;
           task_t          task;
   
           addr = (db_addr_t) address;
   
           size = db_size_option(modif, &u_opt, &t_opt);
           if (t_opt) 
             {
               if (!db_get_next_thread(&thread, 0))
                 return;
               task = thread->task;
             }
           else
             task = db_current_task();
           
           /* if user space is not explicitly specified, 
              look in the kernel */
           if (!u_opt)
             task = TASK_NULL;
   
           if (!DB_VALID_ADDRESS(addr, u_opt)) {
             db_printf("Bad address %#*X\n", 2*sizeof(vm_offset_t), addr);
             return;
           }
   
           while (db_expression(&new_value)) {
               old_value = db_get_task_value(addr, size, FALSE, task);
               db_task_printsym(addr, DB_STGY_ANY, task);
               db_printf("\t\t%#*N\t=\t%#*N\n",
                   2*sizeof(db_expr_t), old_value,
                   2*sizeof(db_expr_t), new_value);
               db_put_task_value(addr, size, new_value, task);
               addr += size;
   
               wrote_one = TRUE;
           }
   
           if (!wrote_one)
               db_error("Nothing written.\n");
   
           db_next = addr;
           db_prev = addr - size;
   }

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