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d85168a5 JH |
1 | ?RCS: $Id$ |
2 | ?RCS: | |
3 | ?RCS: Copyright (c) 2001, Jarkko Hietaniemi | |
0065f4af | 4 | ?RCS: |
65a32477 | 5 | ?RCS: You may redistribute only under the terms of the Artistic License, |
d85168a5 JH |
6 | ?RCS: as specified in the README file that comes with the distribution. |
7 | ?RCS: You may reuse parts of this distribution only within the terms of | |
65a32477 | 8 | ?RCS: that same Artistic License; a copy of which may be found at the root |
d85168a5 JH |
9 | ?RCS: of the source tree for dist 3.0. |
10 | ?RCS: | |
2cb64bf6 | 11 | ?MAKE:d_u32align: Compile cat rm_try Oldconfig run i_stdlib \ |
9589ed74 | 12 | byteorder u32type Myread Setvar u8type signal_t |
d85168a5 JH |
13 | ?MAKE: -pick add $@ %< |
14 | ?S:d_u32align: | |
15 | ?S: This variable tells whether you must access character data | |
16 | ?S: through U32-aligned pointers. | |
17 | ?S:. | |
18 | ?C:U32_ALIGNMENT_REQUIRED: | |
19 | ?C: This symbol, if defined, indicates that you must access | |
20 | ?C: character data through U32-aligned pointers. | |
21 | ?C:. | |
98813c8a JH |
22 | ?H:?%<:#ifndef U32_ALIGNMENT_REQUIRED |
23 | ?H:?%<:#$d_u32align U32_ALIGNMENT_REQUIRED /**/ | |
24 | ?H:?%<:#endif | |
d85168a5 | 25 | ?H:. |
0065f4af | 26 | ?F:!try |
04c34a22 | 27 | : Checking 32bit alignedness |
d85168a5 JH |
28 | $cat <<EOM |
29 | ||
30 | Checking to see whether you can access character data unalignedly... | |
31 | EOM | |
a0d5d9d4 JH |
32 | case "$d_u32align" in |
33 | '') $cat >try.c <<EOCP | |
d85168a5 | 34 | #include <stdio.h> |
3b148aa9 JH |
35 | #$i_stdlib I_STDLIB |
36 | #ifdef I_STDLIB | |
37 | #include <stdlib.h> | |
38 | #endif | |
d85168a5 | 39 | #define U32 $u32type |
99457da0 JH |
40 | #define BYTEORDER 0x$byteorder |
41 | #define U8 $u8type | |
9589ed74 JH |
42 | #include <signal.h> |
43 | #ifdef SIGBUS | |
dc952a08 | 44 | $signal_t bletch(int s) { exit(4); } |
9589ed74 | 45 | #endif |
d85168a5 JH |
46 | int main() { |
47 | #if BYTEORDER == 0x1234 || BYTEORDER == 0x4321 | |
5ccb2b6b MB |
48 | volatile U8 buf[8]; |
49 | volatile U32 *up; | |
d85168a5 JH |
50 | int i; |
51 | ||
52 | if (sizeof(U32) != 4) { | |
53 | printf("sizeof(U32) is not 4, but %d\n", sizeof(U32)); | |
54 | exit(1); | |
55 | } | |
56 | ||
57 | fflush(stdout); | |
58 | ||
9589ed74 JH |
59 | #ifdef SIGBUS |
60 | signal(SIGBUS, bletch); | |
61 | #endif | |
62 | ||
6a2a4e4f JH |
63 | buf[0] = 0; |
64 | buf[1] = 0; | |
65 | buf[2] = 0; | |
66 | buf[3] = 1; | |
750213d3 | 67 | buf[4] = 0; |
6a2a4e4f JH |
68 | buf[5] = 0; |
69 | buf[6] = 0; | |
750213d3 | 70 | buf[7] = 1; |
6a2a4e4f | 71 | |
d85168a5 JH |
72 | for (i = 0; i < 4; i++) { |
73 | up = (U32*)(buf + i); | |
74 | if (! ((*up == 1 << (8*i)) || /* big-endian */ | |
75 | (*up == 1 << (8*(3-i))) /* little-endian */ | |
76 | ) | |
77 | ) | |
78 | { | |
79 | printf("read failed (%x)\n", *up); | |
80 | exit(2); | |
81 | } | |
82 | } | |
83 | ||
84 | /* write test */ | |
85 | for (i = 0; i < 4; i++) { | |
86 | up = (U32*)(buf + i); | |
87 | *up = 0xBeef; | |
88 | if (*up != 0xBeef) { | |
89 | printf("write failed (%x)\n", *up); | |
90 | exit(3); | |
91 | } | |
92 | } | |
93 | ||
94 | exit(0); | |
95 | #else | |
96 | printf("1\n"); | |
97 | exit(1); | |
98 | #endif | |
99 | return 0; | |
100 | } | |
101 | EOCP | |
102 | set try | |
103 | if eval $compile_ok; then | |
99457da0 | 104 | echo "(Testing for character data alignment may crash the test. That's okay.)" >&4 |
0f00356b | 105 | $run ./try 2>&1 >/dev/null |
d85168a5 JH |
106 | case "$?" in |
107 | 0) cat >&4 <<EOM | |
108 | You can access character data pretty unalignedly. | |
109 | EOM | |
110 | d_u32align="$undef" | |
111 | ;; | |
112 | *) cat >&4 <<EOM | |
113 | It seems that you must access character data in an aligned manner. | |
114 | EOM | |
115 | d_u32align="$define" | |
116 | ;; | |
117 | esac | |
d85168a5 JH |
118 | else |
119 | rp='Can you access character data at unaligned addresses?' | |
120 | dflt='n' | |
121 | . ./myread | |
122 | case "$ans" in | |
123 | [yY]*) d_u32align="$undef" ;; | |
124 | *) d_u32align="$define" ;; | |
125 | esac | |
126 | fi | |
2cb64bf6 | 127 | $rm_try |
a0d5d9d4 JH |
128 | ;; |
129 | esac | |
d85168a5 | 130 |