2 * SPDX-License-Identifier: MIT-CMU
4 * Mach Operating System
5 * Copyright (c) 1991,1990 Carnegie Mellon University
8 * Permission to use, copy, modify and distribute this software and its
9 * documentation is hereby granted, provided that both the copyright
10 * notice and this permission notice appear in all copies of the
11 * software, derivative works or modified versions, and any portions
12 * thereof, and that both notices appear in supporting documentation.
14 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS
15 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
16 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
18 * Carnegie Mellon requests users of this software to return to
20 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
21 * School of Computer Science
22 * Carnegie Mellon University
23 * Pittsburgh PA 15213-3890
25 * any improvements or extensions that they make and grant Carnegie the
26 * rights to redistribute these changes.
29 * Author: David B. Golub, Carnegie Mellon University
33 #include <sys/cdefs.h>
34 __FBSDID("$FreeBSD$");
36 #include <sys/param.h>
40 #include <ddb/db_access.h>
43 * Access unaligned data items on aligned (longword)
47 static unsigned db_extend[] = { /* table for sign-extending */
59 db_get_value(db_addr_t addr, int size, bool is_signed)
61 char data[sizeof(u_int64_t)];
65 if (db_read_bytes(addr, size, data) != 0) {
66 db_printf("*** error reading from address %llx ***\n",
73 for (i = 0; i < size; i++)
75 for (i = size - 1; i >= 0; i--)
78 value = (value << 8) + (data[i] & 0xFF);
82 if (is_signed && (value & db_extend[size]) != 0)
83 value |= db_extend[size];
89 db_put_value(db_addr_t addr, int size, db_expr_t value)
91 char data[sizeof(int)];
95 for (i = size - 1; i >= 0; i--)
97 for (i = 0; i < size; i++)
100 data[i] = value & 0xFF;
104 if (db_write_bytes(addr, size, data) != 0) {
105 db_printf("*** error writing to address %llx ***\n",