osfmk/ddb/db_access.c

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_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. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23 /*
  24  * @OSF_COPYRIGHT@
  25  */
  26 /*
  27  * Mach Operating System
  28  * Copyright (c) 1991,1990 Carnegie Mellon University
  29  * All Rights Reserved.
  30  *
  31  * Permission to use, copy, modify and distribute this software and its
  32  * documentation is hereby granted, provided that both the copyright
  33  * notice and this permission notice appear in all copies of the
  34  * software, derivative works or modified versions, and any portions
  35  * thereof, and that both notices appear in supporting documentation.
  36  *
  37  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
  38  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
  39  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
  40  *
  41  * Carnegie Mellon requests users of this software to return to
  42  *
  43  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
  44  *  School of Computer Science
  45  *  Carnegie Mellon University
  46  *  Pittsburgh PA 15213-3890
  47  *
  48  * any improvements or extensions that they make and grant Carnegie Mellon
  49  * the rights to redistribute these changes.
  50  */
  51 /*
  52  */
  53 /*
  54  *      Author: David B. Golub, Carnegie Mellon University
  55  *      Date:   7/90
  56  */
  57 #include <mach/boolean.h>
  58 #include <machine/db_machdep.h>         /* type definitions */
  59 #include <machine/setjmp.h>
  60 #include <machine/endian.h>
  61 #include <kern/task.h>
  62 #include <ddb/db_access.h>
  63
  64
  65
  66 /*
  67  * Access unaligned data items on aligned (longword)
  68  * boundaries.
  69  */
  70
  71 int db_access_level = DB_ACCESS_LEVEL;
  72
  73 db_expr_t
  74 db_get_task_value(
  75         db_addr_t       addr,
  76         register int    size,
  77         boolean_t       is_signed,
  78         task_t          task)
  79 {
  80         char            data[sizeof(db_expr_t)];
  81         register db_expr_t value;
  82         register int    i;
  83         uint64_t signx;
  84
  85         if(size == 0) return 0;
  86
  87         db_read_bytes((vm_offset_t)addr, size, data, task);
  88
  89         value = 0;
  90 #if     BYTE_MSF
  91         for (i = 0; i < size; i++)
  92 #else   /* BYTE_LSF */
  93         for (i = size - 1; i >= 0; i--)
  94 #endif
  95         {
  96             value = (value << 8) + (data[i] & 0xFF);
  97         }
  98
  99         if(!is_signed) return value;
 100
 101         signx = 0xFFFFFFFFFFFFFFFFULL << ((size << 3) - 1);
 102
 103         if(value & signx) value |= signx;       /* Add 1s to front if sign bit is on */
 104
 105         return (value);
 106 }
 107
 108 void
 109 db_put_task_value(
 110         db_addr_t       addr,
 111         register int    size,
 112         register db_expr_t value,
 113         task_t          task)
 114 {
 115         char            data[sizeof(db_expr_t)];
 116         register int    i;
 117
 118 #if     BYTE_MSF
 119         for (i = size - 1; i >= 0; i--)
 120 #else   /* BYTE_LSF */
 121         for (i = 0; i < size; i++)
 122 #endif
 123         {
 124             data[i] = value & 0xFF;
 125             value >>= 8;
 126         }
 127
 128         db_write_bytes((vm_offset_t)addr, size, data, task);
 129 }
 130
 131 db_expr_t
 132 db_get_value(
 133         db_addr_t       addr,
 134         int             size,
 135         boolean_t       is_signed)
 136 {
 137         return(db_get_task_value(addr, size, is_signed, TASK_NULL));
 138 }
 139
 140 void
 141 db_put_value(
 142         db_addr_t       addr,
 143         int             size,
 144         db_expr_t       value)
 145 {
 146         db_put_task_value(addr, size, value, TASK_NULL);
 147 }