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1/*
2 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
3 *
8f6c56a5 4 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
1c79356b 5 *
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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
8ad349bb 24 * limitations under the License.
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25 *
26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
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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#include <mach/boolean.h>
63#include <machine/db_machdep.h> /* type definitions */
64#include <machine/setjmp.h>
65#include <machine/endian.h>
66#include <kern/task.h>
67#include <ddb/db_access.h>
68
69
70
71/*
72 * Access unaligned data items on aligned (longword)
73 * boundaries.
74 */
75
76int db_access_level = DB_ACCESS_LEVEL;
77
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78db_expr_t
79db_get_task_value(
80 db_addr_t addr,
81 register int size,
82 boolean_t is_signed,
83 task_t task)
84{
85 char data[sizeof(db_expr_t)];
86 register db_expr_t value;
87 register int i;
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88 uint64_t signx;
89
90 if(size == 0) return 0;
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91
92 db_read_bytes((vm_offset_t)addr, size, data, task);
93
94 value = 0;
95#if BYTE_MSF
96 for (i = 0; i < size; i++)
97#else /* BYTE_LSF */
98 for (i = size - 1; i >= 0; i--)
99#endif
100 {
101 value = (value << 8) + (data[i] & 0xFF);
102 }
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103
104 if(!is_signed) return value;
105
106 signx = 0xFFFFFFFFFFFFFFFFULL << ((size << 3) - 1);
107
108 if(value & signx) value |= signx; /* Add 1s to front if sign bit is on */
109
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110 return (value);
111}
112
113void
114db_put_task_value(
115 db_addr_t addr,
116 register int size,
117 register db_expr_t value,
118 task_t task)
119{
120 char data[sizeof(db_expr_t)];
121 register int i;
122
123#if BYTE_MSF
124 for (i = size - 1; i >= 0; i--)
125#else /* BYTE_LSF */
126 for (i = 0; i < size; i++)
127#endif
128 {
129 data[i] = value & 0xFF;
130 value >>= 8;
131 }
132
133 db_write_bytes((vm_offset_t)addr, size, data, task);
134}
135
136db_expr_t
137db_get_value(
138 db_addr_t addr,
139 int size,
140 boolean_t is_signed)
141{
142 return(db_get_task_value(addr, size, is_signed, TASK_NULL));
143}
144
145void
146db_put_value(
147 db_addr_t addr,
148 int size,
149 db_expr_t value)
150{
151 db_put_task_value(addr, size, value, TASK_NULL);
152}