1 /* Support for testing and measuring memcpy functions.
2 Copyright (C) 1999-2023 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
18
19 /* This fail contains the actual memcpy test functions. It is included
20 in test-memcpy.c and test-memcpy-large.c. They are split because
21 the tests take a long time to run and splitting them allows for
22 simpler parallel testing. */
23
24 #ifndef MEMCPY_RESULT
25 #define MEMCPY_RESULT(dst, len) dst
26 #define MIN_PAGE_SIZE 131072
27 #define TEST_MAIN
28 #define TEST_NAME "memcpy"
29 #define TIMEOUT (8 * 60)
30 #include "test-string.h"
31
32 IMPL (memcpy, 1)
33
34 /* Naive implementation to verify results. */
35 char *
36 simple_memcpy (char *dst, const char *src, size_t n)
37 {
38 char *ret = dst;
39 while (n--)
40 *dst++ = *src++;
41 return ret;
42 }
43
44 #endif
45 typedef char *(*proto_t) (char *, const char *, size_t);
46 typedef uint32_t __attribute__ ((may_alias, aligned (1))) unaligned_uint32_t;
47
48 static void
49 do_one_test (impl_t *impl, char *dst, const char *src, size_t len)
50 {
51 size_t i;
52
53 /* Must clear the destination buffer set by the previous run. */
54 for (i = 0; i < len; i++)
55 dst[i] = 0;
56
57 if (CALL (impl, dst, src, len) != MEMCPY_RESULT (dst, len))
58 {
59 error (0, 0, "Wrong result in function %s %p %p", impl->name,
60 CALL (impl, dst, src, len), MEMCPY_RESULT (dst, len));
61 ret = 1;
62 return;
63 }
64
65 if (memcmp (dst, src, len) != 0)
66 {
67 error (0, 0,
68 "Wrong result in function %s dst %p \"%.*s\" src %p \"%.*s\" len "
69 "%zu",
70 impl->name, dst, (int)len, dst, src, (int)len, src, len);
71 ret = 1;
72 return;
73 }
74 }
75
76 static void
77 do_test (size_t align1, size_t align2, size_t len)
78 {
79 size_t i, j;
80 char *s1, *s2;
81
82 align1 &= 4095;
83 if (align1 + len >= page_size)
84 return;
85
86 align2 &= 4095;
87 if (align2 + len >= page_size)
88 return;
89
90 s1 = (char *)(buf1 + align1);
91 s2 = (char *)(buf2 + align2);
92 for (size_t repeats = 0; repeats < 2; ++repeats)
93 {
94 for (i = 0, j = 1; i < len; i++, j += 23)
95 s1[i] = j;
96
97 FOR_EACH_IMPL (impl, 0)
98 do_one_test (impl, s2, s1, len);
99
100 s1 = (char *) (buf2 + align1);
101 s2 = (char *) (buf1 + align2);
102 }
103 }
104
105 static void
106 do_test1 (size_t align1, size_t align2, size_t size)
107 {
108 void *large_buf;
109 size_t mmap_size, region_size;
110
111 align1 &= (page_size - 1);
112 if (align1 == 0)
113 align1 = page_size;
114
115 align2 &= (page_size - 1);
116 if (align2 == 0)
117 align2 = page_size;
118
119 region_size = (size + page_size - 1) & (~(page_size - 1));
120
121 mmap_size = region_size * 2 + 3 * page_size;
122 large_buf = mmap (NULL, mmap_size, PROT_READ | PROT_WRITE,
123 MAP_PRIVATE | MAP_ANON, -1, 0);
124 if (large_buf == MAP_FAILED)
125 {
126 puts ("Failed to allocate large_buf, skipping do_test");
127 return;
128 }
129 if (mprotect (large_buf + region_size + page_size, page_size, PROT_NONE))
130 error (EXIT_FAILURE, errno, "mprotect failed");
131
132 size_t array_size = size / sizeof (uint32_t);
133 unaligned_uint32_t *dest = large_buf + align1;
134 unaligned_uint32_t *src = large_buf + region_size + 2 * page_size + align2;
135 size_t i;
136 for (size_t repeats = 0; repeats < 2; repeats++)
137 {
138 for (i = 0; i < array_size; i++)
139 src[i] = (uint32_t)i;
140 FOR_EACH_IMPL (impl, 0)
141 {
142 memset (dest, -1, size);
143 CALL (impl, (char *)dest, (char *)src, size);
144 if (memcmp (src, dest, size))
145 {
146 for (i = 0; i < array_size; i++)
147 if (dest[i] != src[i])
148 {
149 error (0, 0,
150 "Wrong result in function %s dst \"%p\" src \"%p\" "
151 "offset \"%zd\"",
152 impl->name, dest, src, i);
153 ret = 1;
154 munmap ((void *)large_buf, mmap_size);
155 return;
156 }
157 }
158 }
159 dest = large_buf + region_size + 2 * page_size + align1;
160 src = large_buf + align2;
161 }
162 munmap ((void *)large_buf, mmap_size);
163 }