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git.saurik.com Git - apple/xnu.git/blob - osfmk/ddb/db_access.c
2 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
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7 * are subject to the Apple Public Source License Version 1.1 (the
8 * "License"). You may not use this file except in compliance with the
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12 * This Original Code and all software distributed under the License are
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14 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
15 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
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26 * Mach Operating System
27 * Copyright (c) 1991,1990 Carnegie Mellon University
28 * All Rights Reserved.
30 * Permission to use, copy, modify and distribute this software and its
31 * documentation is hereby granted, provided that both the copyright
32 * notice and this permission notice appear in all copies of the
33 * software, derivative works or modified versions, and any portions
34 * thereof, and that both notices appear in supporting documentation.
36 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
37 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
38 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
40 * Carnegie Mellon requests users of this software to return to
42 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
43 * School of Computer Science
44 * Carnegie Mellon University
45 * Pittsburgh PA 15213-3890
47 * any improvements or extensions that they make and grant Carnegie Mellon
48 * the rights to redistribute these changes.
53 * Author: David B. Golub, Carnegie Mellon University
56 #include <mach/boolean.h>
57 #include <machine/db_machdep.h> /* type definitions */
58 #include <machine/setjmp.h>
59 #include <machine/endian.h>
60 #include <kern/task.h>
61 #include <ddb/db_access.h>
66 * Access unaligned data items on aligned (longword)
70 int db_access_level
= DB_ACCESS_LEVEL
;
73 * This table is for sign-extending things.
74 * Therefore its entries are signed, and yes
75 * they are in fact negative numbers.
76 * So don't put Us in it. Or Ls either.
77 * Otherwise there is no point having it, n'est pas ?
79 static int db_extend
[sizeof(long)+1] = { /* table for sign-extending */
80 #if defined(__arch64__)
90 #else /* !defined(__arch64__) */
96 #endif /* defined(__arch64__) */
106 char data
[sizeof(db_expr_t
)];
107 register db_expr_t value
;
110 db_read_bytes((vm_offset_t
)addr
, size
, data
, task
);
114 for (i
= 0; i
< size
; i
++)
116 for (i
= size
- 1; i
>= 0; i
--)
119 value
= (value
<< 8) + (data
[i
] & 0xFF);
122 if (size
<= sizeof(int)) {
123 if (is_signed
&& (value
& db_extend
[size
]) != 0)
124 value
|= db_extend
[size
];
133 register db_expr_t value
,
136 char data
[sizeof(db_expr_t
)];
140 for (i
= size
- 1; i
>= 0; i
--)
142 for (i
= 0; i
< size
; i
++)
145 data
[i
] = value
& 0xFF;
149 db_write_bytes((vm_offset_t
)addr
, size
, data
, task
);
158 return(db_get_task_value(addr
, size
, is_signed
, TASK_NULL
));
167 db_put_task_value(addr
, size
, value
, TASK_NULL
);