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
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23 * any improvements or extensions that they make and grant Carnegie the
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26 * $FreeBSD: src/sys/ddb/db_access.c,v 1.15 1999/08/28 00:41:04 peter Exp $
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 */
55 db_get_value(db_addr_t addr, int size, boolean_t is_signed)
57 char data[sizeof(int)];
61 db_read_bytes(addr, size, data);
65 for (i = 0; i < size; i++)
67 for (i = size - 1; i >= 0; i--)
70 value = (value << 8) + (data[i] & 0xFF);
74 if (is_signed && (value & db_extend[size]) != 0)
75 value |= db_extend[size];
81 db_put_value(db_addr_t addr, int size, db_expr_t value)
83 char data[sizeof(int)];
87 for (i = size - 1; i >= 0; i--)
89 for (i = 0; i < size; i++)
92 data[i] = value & 0xFF;
96 db_write_bytes(addr, size, data);