osfmk/ddb/db_access.c

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25 /*
  26  * @OSF_COPYRIGHT@
  27  */
  28 /*
  29  * Mach Operating System
  30  * Copyright (c) 1991,1990 Carnegie Mellon University
  31  * All Rights Reserved.
  32  *
  33  * Permission to use, copy, modify and distribute this software and its
  34  * documentation is hereby granted, provided that both the copyright
  35  * notice and this permission notice appear in all copies of the
  36  * software, derivative works or modified versions, and any portions
  37  * thereof, and that both notices appear in supporting documentation.
  38  *
  39  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
  40  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
  41  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
  42  *
  43  * Carnegie Mellon requests users of this software to return to
  44  *
  45  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
  46  *  School of Computer Science
  47  *  Carnegie Mellon University
  48  *  Pittsburgh PA 15213-3890
  49  *
  50  * any improvements or extensions that they make and grant Carnegie Mellon
  51  * the rights to redistribute these changes.
  52  */
  53 /*
  54  */
  55 /*
  56  *      Author: David B. Golub, Carnegie Mellon University
  57  *      Date:   7/90
  58  */
  59 #include <mach/boolean.h>
  60 #include <machine/db_machdep.h>         /* type definitions */
  61 #include <machine/setjmp.h>
  62 #include <machine/endian.h>
  63 #include <kern/task.h>
  64 #include <ddb/db_access.h>
  65
  66
  67
  68 /*
  69  * Access unaligned data items on aligned (longword)
  70  * boundaries.
  71  */
  72
  73 int db_access_level = DB_ACCESS_LEVEL;
  74
  75 db_expr_t
  76 db_get_task_value(
  77         db_addr_t       addr,
  78         register int    size,
  79         boolean_t       is_signed,
  80         task_t          task)
  81 {
  82         char            data[sizeof(db_expr_t)];
  83         register db_expr_t value;
  84         register int    i;
  85         uint64_t signx;
  86
  87         if(size == 0) return 0;
  88
  89         db_read_bytes((vm_offset_t)addr, size, data, task);
  90
  91         value = 0;
  92 #if     BYTE_MSF
  93         for (i = 0; i < size; i++)
  94 #else   /* BYTE_LSF */
  95         for (i = size - 1; i >= 0; i--)
  96 #endif
  97         {
  98             value = (value << 8) + (data[i] & 0xFF);
  99         }
 100
 101         if(!is_signed) return value;
 102
 103         signx = 0xFFFFFFFFFFFFFFFFULL << ((size << 3) - 1);
 104
 105         if(value & signx) value |= signx;       /* Add 1s to front if sign bit is on */
 106
 107         return (value);
 108 }
 109
 110 void
 111 db_put_task_value(
 112         db_addr_t       addr,
 113         register int    size,
 114         register db_expr_t value,
 115         task_t          task)
 116 {
 117         char            data[sizeof(db_expr_t)];
 118         register int    i;
 119
 120 #if     BYTE_MSF
 121         for (i = size - 1; i >= 0; i--)
 122 #else   /* BYTE_LSF */
 123         for (i = 0; i < size; i++)
 124 #endif
 125         {
 126             data[i] = value & 0xFF;
 127             value >>= 8;
 128         }
 129
 130         db_write_bytes((vm_offset_t)addr, size, data, task);
 131 }
 132
 133 db_expr_t
 134 db_get_value(
 135         db_addr_t       addr,
 136         int             size,
 137         boolean_t       is_signed)
 138 {
 139         return(db_get_task_value(addr, size, is_signed, TASK_NULL));
 140 }
 141
 142 void
 143 db_put_value(
 144         db_addr_t       addr,
 145         int             size,
 146         db_expr_t       value)
 147 {
 148         db_put_task_value(addr, size, value, TASK_NULL);
 149 }