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
33 #include <sys/param.h>
36 #include <ddb/db_access.h>
39 * Access unaligned data items on aligned (longword)
43 static unsigned db_extend[] = { /* table for sign-extending */
51 db_get_value(addr, size, is_signed)
56 char data[sizeof(int)];
57 register db_expr_t value;
60 db_read_bytes(addr, size, data);
64 for (i = 0; i < size; i++)
66 for (i = size - 1; i >= 0; i--)
69 value = (value << 8) + (data[i] & 0xFF);
73 if (is_signed && (value & db_extend[size]) != 0)
74 value |= db_extend[size];
80 db_put_value(addr, size, value)
83 register db_expr_t value;
85 char data[sizeof(int)];
89 for (i = size - 1; i >= 0; i--)
91 for (i = 0; i < size; i++)
94 data[i] = value & 0xFF;
98 db_write_bytes(addr, size, data);