osfmk/ddb/db_write_cmd.c

   1 /*
   2  * Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_OSREFERENCE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License.  The rights granted to you under the
  10  * License may not be used to create, or enable the creation or
  11  * redistribution of, unlawful or unlicensed copies of an Apple operating
  12  * system, or to circumvent, violate, or enable the circumvention or
  13  * violation of, any terms of an Apple operating system software license
  14  * agreement.
  15  *
  16  * Please obtain a copy of the License at
  17  * http://www.opensource.apple.com/apsl/ and read it before using this
  18  * file.
  19  *
  20  * The Original Code and all software distributed under the License are
  21  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  22  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  23  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  24  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  25  * Please see the License for the specific language governing rights and
  26  * limitations under the License.
  27  *
  28  * @APPLE_LICENSE_OSREFERENCE_HEADER_END@
  29  */
  30 /*
  31  * @OSF_COPYRIGHT@
  32  */
  33 /*
  34  * Mach Operating System
  35  * Copyright (c) 1991,1990 Carnegie Mellon University
  36  * All Rights Reserved.
  37  *
  38  * Permission to use, copy, modify and distribute this software and its
  39  * documentation is hereby granted, provided that both the copyright
  40  * notice and this permission notice appear in all copies of the
  41  * software, derivative works or modified versions, and any portions
  42  * thereof, and that both notices appear in supporting documentation.
  43  *
  44  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
  45  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
  46  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
  47  *
  48  * Carnegie Mellon requests users of this software to return to
  49  *
  50  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
  51  *  School of Computer Science
  52  *  Carnegie Mellon University
  53  *  Pittsburgh PA 15213-3890
  54  *
  55  * any improvements or extensions that they make and grant Carnegie Mellon
  56  * the rights to redistribute these changes.
  57  */
  58 /*
  59  */
  60 /*
  61  *      Author: David B. Golub,  Carnegie Mellon University
  62  *      Date:   7/90
  63  */
  64
  65 #include <mach/boolean.h>
  66 #include <kern/task.h>
  67 #include <kern/thread.h>
  68
  69 #include <machine/db_machdep.h>
  70
  71 #include <ddb/db_lex.h>
  72 #include <ddb/db_access.h>
  73 #include <ddb/db_command.h>
  74 #include <ddb/db_sym.h>
  75 #include <ddb/db_task_thread.h>
  76 #include <ddb/db_expr.h>
  77 #include <ddb/db_write_cmd.h>
  78 #include <ddb/db_output.h>                      /* For db_printf() */
  79
  80 /*
  81  * Write to file.
  82  */
  83 void
  84 db_write_cmd(
  85         db_expr_t       address,
  86         boolean_t       have_addr,
  87         db_expr_t       count,
  88         char *          modif)
  89 {
  90         register db_addr_t      addr;
  91         register db_expr_t      old_value;
  92         db_expr_t       new_value;
  93         register int    size;
  94         boolean_t       wrote_one = FALSE;
  95         boolean_t       t_opt, u_opt;
  96         thread_t        thr_act;
  97         task_t          task;
  98
  99         addr = (db_addr_t) address;
 100
 101         size = db_size_option(modif, &u_opt, &t_opt);
 102
 103         if (t_opt)
 104           {
 105             if (!db_get_next_act(&thr_act, 0))
 106               return;
 107             task = thr_act->task;
 108           }
 109         else
 110           task = db_current_space();
 111
 112         /* if user space is not explicitly specified,
 113            look in the kernel */
 114         if (!u_opt)
 115           task = TASK_NULL;
 116
 117         if (!DB_VALID_ADDRESS(addr, u_opt)) {
 118           db_printf("Bad address 0x%llx\n", (unsigned long long)addr);
 119           return;
 120         }
 121
 122         while (db_expression(&new_value)) {
 123             old_value = db_get_task_value(addr, size, FALSE, task);
 124             db_task_printsym(addr, DB_STGY_ANY, task);
 125             db_printf("\t\t%#8lln\t=\t%#8lln\n", (unsigned long long)old_value, (unsigned long long)new_value);
 126             db_put_task_value(addr, size, new_value, task);
 127             addr += size;
 128
 129             wrote_one = TRUE;
 130         }
 131
 132         if (!wrote_one)
 133             db_error("Nothing written.\n");
 134
 135         db_next = addr;
 136         db_prev = addr - size;
 137 }