2 * Mach Operating System
3 * Copyright (c) 1991,1990 Carnegie Mellon University
6 * Permission to use, copy, modify and distribute this software and its
7 * documentation is hereby granted, provided that both the copyright
8 * notice and this permission notice appear in all copies of the
9 * software, derivative works or modified versions, and any portions
10 * thereof, and that both notices appear in supporting documentation.
12 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS
13 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
14 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
16 * Carnegie Mellon requests users of this software to return to
18 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
19 * School of Computer Science
20 * Carnegie Mellon University
21 * Pittsburgh PA 15213-3890
23 * any improvements or extensions that they make and grant Carnegie the
24 * rights to redistribute these changes.
30 * Author: David B. Golub, Carnegie Mellon University
35 #include <machine/db_machdep.h> /* type definitions */
38 * Access unaligned data items on aligned (longword)
42 extern void db_read_bytes(); /* machine-dependent */
43 extern void db_write_bytes(); /* machine-dependent */
45 int db_extend[] = { /* table for sign-extending */
53 db_get_value(addr, size, is_signed)
58 char data[sizeof(int)];
59 register db_expr_t value;
62 db_read_bytes(addr, size, data);
66 for (i = 0; i < size; i++)
68 for (i = size - 1; i >= 0; i--)
71 value = (value << 8) + (data[i] & 0xFF);
75 if (is_signed && (value & db_extend[size]) != 0)
76 value |= db_extend[size];
82 db_put_value(addr, size, value)
85 register db_expr_t value;
87 char data[sizeof(int)];
91 for (i = size - 1; i >= 0; i--)
93 for (i = 0; i < size; i++)
96 data[i] = value & 0xFF;
100 db_write_bytes(addr, size, data);