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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 /*
76 * This table is for sign-extending things.
77 * Therefore its entries are signed, and yes
78 * they are in fact negative numbers.
79 * So don't put Us in it. Or Ls either.
80 * Otherwise there is no point having it, n'est pas ?
81 */
82 static int db_extend[sizeof(long)+1] = { /* table for sign-extending */
83 #if defined(__arch64__)
84 0,
85 0xFFFFFFFFFFFFFF80,
86 0xFFFFFFFFFFFF8000,
87 0xFFFFFFFFFF800000,
88 0xFFFFFFFF80000000,
89 0xFFFFFF8000000000,
90 0xFFFF800000000000,
91 0xFF80000000000000,
92 0x8000000000000000,
93 #else /* !defined(__arch64__) */
94 0,
95 0xFFFFFF80,
96 0xFFFF8000,
97 0xFF800000,
98 0x80000000
99 #endif /* defined(__arch64__) */
100 };
101
102 db_expr_t
103 db_get_task_value(
104 db_addr_t addr,
105 register int size,
106 boolean_t is_signed,
107 task_t task)
108 {
109 char data[sizeof(db_expr_t)];
110 register db_expr_t value;
111 register int i;
112
113 db_read_bytes((vm_offset_t)addr, size, data, task);
114
115 value = 0;
116 #if BYTE_MSF
117 for (i = 0; i < size; i++)
118 #else /* BYTE_LSF */
119 for (i = size - 1; i >= 0; i--)
120 #endif
121 {
122 value = (value << 8) + (data[i] & 0xFF);
123 }
124
125 if (size <= sizeof(int)) {
126 if (is_signed && (value & db_extend[size]) != 0)
127 value |= db_extend[size];
128 }
129 return (value);
130 }
131
132 void
133 db_put_task_value(
134 db_addr_t addr,
135 register int size,
136 register db_expr_t value,
137 task_t task)
138 {
139 char data[sizeof(db_expr_t)];
140 register int i;
141
142 #if BYTE_MSF
143 for (i = size - 1; i >= 0; i--)
144 #else /* BYTE_LSF */
145 for (i = 0; i < size; i++)
146 #endif
147 {
148 data[i] = value & 0xFF;
149 value >>= 8;
150 }
151
152 db_write_bytes((vm_offset_t)addr, size, data, task);
153 }
154
155 db_expr_t
156 db_get_value(
157 db_addr_t addr,
158 int size,
159 boolean_t is_signed)
160 {
161 return(db_get_task_value(addr, size, is_signed, TASK_NULL));
162 }
163
164 void
165 db_put_value(
166 db_addr_t addr,
167 int size,
168 db_expr_t value)
169 {
170 db_put_task_value(addr, size, value, TASK_NULL);
171 }