Commit | Line | Data |
---|---|---|
15637ed4 RG |
1 | /* |
2 | * Mach Operating System | |
3 | * Copyright (c) 1991,1990 Carnegie Mellon University | |
4 | * All Rights Reserved. | |
5 | * | |
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. | |
11 | * | |
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. | |
15 | * | |
16 | * Carnegie Mellon requests users of this software to return to | |
17 | * | |
18 | * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU | |
19 | * School of Computer Science | |
20 | * Carnegie Mellon University | |
21 | * Pittsburgh PA 15213-3890 | |
22 | * | |
23 | * any improvements or extensions that they make and grant Carnegie the | |
24 | * rights to redistribute these changes. | |
15637ed4 | 25 | * |
78ed81a3 | 26 | * $Id$ |
15637ed4 | 27 | */ |
78ed81a3 | 28 | |
15637ed4 RG |
29 | /* |
30 | * Author: David B. Golub, Carnegie Mellon University | |
31 | * Date: 7/90 | |
32 | */ | |
33 | #include "param.h" | |
34 | #include "proc.h" | |
35 | #include <machine/db_machdep.h> /* type definitions */ | |
36 | ||
37 | /* | |
38 | * Access unaligned data items on aligned (longword) | |
39 | * boundaries. | |
40 | */ | |
41 | ||
42 | extern void db_read_bytes(); /* machine-dependent */ | |
43 | extern void db_write_bytes(); /* machine-dependent */ | |
44 | ||
45 | int db_extend[] = { /* table for sign-extending */ | |
46 | 0, | |
47 | 0xFFFFFF80, | |
48 | 0xFFFF8000, | |
49 | 0xFF800000 | |
50 | }; | |
51 | ||
52 | db_expr_t | |
53 | db_get_value(addr, size, is_signed) | |
54 | db_addr_t addr; | |
55 | register int size; | |
56 | boolean_t is_signed; | |
57 | { | |
58 | char data[sizeof(int)]; | |
59 | register db_expr_t value; | |
60 | register int i; | |
61 | ||
62 | db_read_bytes(addr, size, data); | |
63 | ||
64 | value = 0; | |
65 | #if BYTE_MSF | |
66 | for (i = 0; i < size; i++) | |
67 | #else /* BYTE_LSF */ | |
68 | for (i = size - 1; i >= 0; i--) | |
69 | #endif | |
70 | { | |
71 | value = (value << 8) + (data[i] & 0xFF); | |
72 | } | |
73 | ||
74 | if (size < 4) { | |
75 | if (is_signed && (value & db_extend[size]) != 0) | |
76 | value |= db_extend[size]; | |
77 | } | |
78 | return (value); | |
79 | } | |
80 | ||
81 | void | |
82 | db_put_value(addr, size, value) | |
83 | db_addr_t addr; | |
84 | register int size; | |
85 | register db_expr_t value; | |
86 | { | |
87 | char data[sizeof(int)]; | |
88 | register int i; | |
89 | ||
90 | #if BYTE_MSF | |
91 | for (i = size - 1; i >= 0; i--) | |
92 | #else /* BYTE_LSF */ | |
93 | for (i = 0; i < size; i++) | |
94 | #endif | |
95 | { | |
96 | data[i] = value & 0xFF; | |
97 | value >>= 8; | |
98 | } | |
99 | ||
100 | db_write_bytes(addr, size, data); | |
101 | } | |
102 |