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.
27 * Author: David B. Golub, Carnegie Mellon University
31 #include <sys/cdefs.h>
32 __FBSDID("$FreeBSD$");
34 #include <sys/param.h>
38 #include <ddb/db_access.h>
41 * Access unaligned data items on aligned (longword)
45 static unsigned db_extend[] = { /* table for sign-extending */
57 db_get_value(db_addr_t addr, int size, bool is_signed)
59 char data[sizeof(u_int64_t)];
63 if (db_read_bytes(addr, size, data) != 0) {
64 db_printf("*** error reading from address %llx ***\n",
71 for (i = 0; i < size; i++)
73 for (i = size - 1; i >= 0; i--)
76 value = (value << 8) + (data[i] & 0xFF);
80 if (is_signed && (value & db_extend[size]) != 0)
81 value |= db_extend[size];
87 db_put_value(db_addr_t addr, int size, db_expr_t value)
89 char data[sizeof(int)];
93 for (i = size - 1; i >= 0; i--)
95 for (i = 0; i < size; i++)
98 data[i] = value & 0xFF;
102 if (db_write_bytes(addr, size, data) != 0) {
103 db_printf("*** error writing to address %llx ***\n",