osfmk/ddb/db_write_cmd.c

   1 /*
   2  * Copyright (c) 2000-2005 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_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 License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28 /*
  29  * @OSF_COPYRIGHT@
  30  */
  31 /*
  32  * Mach Operating System
  33  * Copyright (c) 1991,1990 Carnegie Mellon University
  34  * All Rights Reserved.
  35  *
  36  * Permission to use, copy, modify and distribute this software and its
  37  * documentation is hereby granted, provided that both the copyright
  38  * notice and this permission notice appear in all copies of the
  39  * software, derivative works or modified versions, and any portions
  40  * thereof, and that both notices appear in supporting documentation.
  41  *
  42  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
  43  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
  44  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
  45  *
  46  * Carnegie Mellon requests users of this software to return to
  47  *
  48  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
  49  *  School of Computer Science
  50  *  Carnegie Mellon University
  51  *  Pittsburgh PA 15213-3890
  52  *
  53  * any improvements or extensions that they make and grant Carnegie Mellon
  54  * the rights to redistribute these changes.
  55  */
  56 /*
  57  */
  58 /*
  59  *      Author: David B. Golub,  Carnegie Mellon University
  60  *      Date:   7/90
  61  */
  62
  63 #include <mach/boolean.h>
  64 #include <kern/task.h>
  65 #include <kern/thread.h>
  66
  67 #include <machine/db_machdep.h>
  68
  69 #include <ddb/db_lex.h>
  70 #include <ddb/db_access.h>
  71 #include <ddb/db_command.h>
  72 #include <ddb/db_sym.h>
  73 #include <ddb/db_task_thread.h>
  74 #include <ddb/db_expr.h>
  75 #include <ddb/db_write_cmd.h>
  76 #include <ddb/db_output.h>                      /* For db_printf() */
  77
  78 /*
  79  * Write to file.
  80  */
  81 void
  82 db_write_cmd(db_expr_t address, __unused boolean_t have_addr,
  83              __unused db_expr_t count, char *modif)
  84 {
  85         register db_addr_t      addr;
  86         register db_expr_t      old_value;
  87         db_expr_t       new_value;
  88         register int    size;
  89         boolean_t       wrote_one = FALSE;
  90         boolean_t       t_opt, u_opt;
  91         thread_t        thr_act;
  92         task_t          task;
  93
  94         addr = (db_addr_t) address;
  95
  96         size = db_size_option(modif, &u_opt, &t_opt);
  97
  98         if (t_opt)
  99           {
 100             if (!db_get_next_act(&thr_act, 0))
 101               return;
 102             task = thr_act->task;
 103           }
 104         else
 105           task = db_current_space();
 106
 107         /* if user space is not explicitly specified,
 108            look in the kernel */
 109         if (!u_opt)
 110           task = TASK_NULL;
 111
 112         if (!DB_VALID_ADDRESS(addr, u_opt)) {
 113           db_printf("Bad address 0x%llx\n", (unsigned long long)addr);
 114           return;
 115         }
 116
 117         while (db_expression(&new_value)) {
 118             old_value = db_get_task_value(addr, size, FALSE, task);
 119             db_task_printsym(addr, DB_STGY_ANY, task);
 120             db_printf("\t\t%#8lln\t=\t%#8lln\n", (unsigned long long)old_value, (unsigned long long)new_value);
 121             db_put_task_value(addr, size, new_value, task);
 122             addr += size;
 123
 124             wrote_one = TRUE;
 125         }
 126
 127         if (!wrote_one)
 128             db_error("Nothing written.\n");
 129
 130         db_next = addr;
 131         db_prev = addr - size;
 132 }