osfmk/ddb/db_write_cmd.c

   1 /*
   2  * Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 /*
  23  * @OSF_COPYRIGHT@
  24  */
  25 /*
  26  * Mach Operating System
  27  * Copyright (c) 1991,1990 Carnegie Mellon University
  28  * All Rights Reserved.
  29  *
  30  * Permission to use, copy, modify and distribute this software and its
  31  * documentation is hereby granted, provided that both the copyright
  32  * notice and this permission notice appear in all copies of the
  33  * software, derivative works or modified versions, and any portions
  34  * thereof, and that both notices appear in supporting documentation.
  35  *
  36  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
  37  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
  38  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
  39  *
  40  * Carnegie Mellon requests users of this software to return to
  41  *
  42  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
  43  *  School of Computer Science
  44  *  Carnegie Mellon University
  45  *  Pittsburgh PA 15213-3890
  46  *
  47  * any improvements or extensions that they make and grant Carnegie Mellon
  48  * the rights to redistribute these changes.
  49  */
  50 /*
  51  */
  52 /*
  53  *      Author: David B. Golub,  Carnegie Mellon University
  54  *      Date:   7/90
  55  */
  56
  57 #include <mach/boolean.h>
  58 #include <kern/task.h>
  59 #include <kern/thread.h>
  60
  61 #include <machine/db_machdep.h>
  62
  63 #include <ddb/db_lex.h>
  64 #include <ddb/db_access.h>
  65 #include <ddb/db_command.h>
  66 #include <ddb/db_sym.h>
  67 #include <ddb/db_task_thread.h>
  68 #include <ddb/db_expr.h>
  69 #include <ddb/db_write_cmd.h>
  70 #include <ddb/db_output.h>                      /* For db_printf() */
  71
  72 /*
  73  * Write to file.
  74  */
  75 void
  76 db_write_cmd(
  77         db_expr_t       address,
  78         boolean_t       have_addr,
  79         db_expr_t       count,
  80         char *          modif)
  81 {
  82         register db_addr_t      addr;
  83         register db_expr_t      old_value;
  84         db_expr_t       new_value;
  85         register int    size;
  86         boolean_t       wrote_one = FALSE;
  87         boolean_t       t_opt, u_opt;
  88         thread_t        thr_act;
  89         task_t          task;
  90
  91         addr = (db_addr_t) address;
  92
  93         size = db_size_option(modif, &u_opt, &t_opt);
  94
  95         if (t_opt)
  96           {
  97             if (!db_get_next_act(&thr_act, 0))
  98               return;
  99             task = thr_act->task;
 100           }
 101         else
 102           task = db_current_space();
 103
 104         /* if user space is not explicitly specified,
 105            look in the kernel */
 106         if (!u_opt)
 107           task = TASK_NULL;
 108
 109         if (!DB_VALID_ADDRESS(addr, u_opt)) {
 110           db_printf("Bad address 0x%llx\n", (unsigned long long)addr);
 111           return;
 112         }
 113
 114         while (db_expression(&new_value)) {
 115             old_value = db_get_task_value(addr, size, FALSE, task);
 116             db_task_printsym(addr, DB_STGY_ANY, task);
 117             db_printf("\t\t%#8lln\t=\t%#8lln\n", (unsigned long long)old_value, (unsigned long long)new_value);
 118             db_put_task_value(addr, size, new_value, task);
 119             addr += size;
 120
 121             wrote_one = TRUE;
 122         }
 123
 124         if (!wrote_one)
 125             db_error("Nothing written.\n");
 126
 127         db_next = addr;
 128         db_prev = addr - size;
 129 }