1 /* Support for testing and measuring memcpy functions.
2 Copyright (C) 1999-2021 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 char *simple_memcpy (char *, const char *, size_t);
33 char *builtin_memcpy (char *, const char *, size_t);
34
35 IMPL (simple_memcpy, 0)
36 IMPL (builtin_memcpy, 0)
37 IMPL (memcpy, 1)
38 char *
simple_memcpy(char * dst,const char * src,size_t n)39 simple_memcpy (char *dst, const char *src, size_t n)
40 {
41 char *ret = dst;
42 while (n--)
43 *dst++ = *src++;
44 return ret;
45 }
46
47 char *
builtin_memcpy(char * dst,const char * src,size_t n)48 builtin_memcpy (char *dst, const char *src, size_t n)
49 {
50 return __builtin_memcpy (dst, src, n);
51 }
52 #endif
53 typedef char *(*proto_t) (char *, const char *, size_t);
54 typedef uint32_t __attribute__ ((may_alias, aligned (1))) unaligned_uint32_t;
55
56 static void
do_one_test(impl_t * impl,char * dst,const char * src,size_t len)57 do_one_test (impl_t *impl, char *dst, const char *src, size_t len)
58 {
59 size_t i;
60
61 /* Must clear the destination buffer set by the previous run. */
62 for (i = 0; i < len; i++)
63 dst[i] = 0;
64
65 if (CALL (impl, dst, src, len) != MEMCPY_RESULT (dst, len))
66 {
67 error (0, 0, "Wrong result in function %s %p %p", impl->name,
68 CALL (impl, dst, src, len), MEMCPY_RESULT (dst, len));
69 ret = 1;
70 return;
71 }
72
73 if (memcmp (dst, src, len) != 0)
74 {
75 error (0, 0,
76 "Wrong result in function %s dst %p \"%.*s\" src %p \"%.*s\" len "
77 "%zu",
78 impl->name, dst, (int)len, dst, src, (int)len, src, len);
79 ret = 1;
80 return;
81 }
82 }
83
84 static void
do_test(size_t align1,size_t align2,size_t len)85 do_test (size_t align1, size_t align2, size_t len)
86 {
87 size_t i, j, repeats;
88 char *s1, *s2;
89
90 align1 &= 4095;
91 if (align1 + len >= page_size)
92 return;
93
94 align2 &= 4095;
95 if (align2 + len >= page_size)
96 return;
97
98 s1 = (char *)(buf1 + align1);
99 s2 = (char *)(buf2 + align2);
100 for (repeats = 0; repeats < 2; ++repeats)
101 {
102 for (i = 0, j = 1; i < len; i++, j += 23)
103 s1[i] = j;
104
105 FOR_EACH_IMPL (impl, 0)
106 do_one_test (impl, s2, s1, len);
107 }
108 }
109
110 static void
do_test1(size_t align1,size_t align2,size_t size)111 do_test1 (size_t align1, size_t align2, size_t size)
112 {
113 void *large_buf;
114 size_t mmap_size, region_size;
115
116 align1 &= (page_size - 1);
117 if (align1 == 0)
118 align1 = page_size;
119
120 align2 &= (page_size - 1);
121 if (align2 == 0)
122 align2 = page_size;
123
124 region_size = (size + page_size - 1) & (~(page_size - 1));
125
126 mmap_size = region_size * 2 + 3 * page_size;
127 large_buf = mmap (NULL, mmap_size, PROT_READ | PROT_WRITE,
128 MAP_PRIVATE | MAP_ANON, -1, 0);
129 if (large_buf == MAP_FAILED)
130 {
131 puts ("Failed to allocate large_buf, skipping do_test");
132 return;
133 }
134 if (mprotect (large_buf + region_size + page_size, page_size, PROT_NONE))
135 error (EXIT_FAILURE, errno, "mprotect failed");
136
137 size_t array_size = size / sizeof (uint32_t);
138 unaligned_uint32_t *dest = large_buf + align1;
139 unaligned_uint32_t *src = large_buf + region_size + 2 * page_size + align2;
140 size_t i;
141 size_t repeats;
142 for (repeats = 0; repeats < 2; repeats++)
143 {
144 for (i = 0; i < array_size; i++)
145 src[i] = (uint32_t)i;
146 FOR_EACH_IMPL (impl, 0)
147 {
148 memset (dest, -1, size);
149 CALL (impl, (char *)dest, (char *)src, size);
150 if (memcmp (src, dest, size))
151 {
152 for (i = 0; i < array_size; i++)
153 if (dest[i] != src[i])
154 {
155 error (0, 0,
156 "Wrong result in function %s dst \"%p\" src \"%p\" "
157 "offset \"%zd\"",
158 impl->name, dest, src, i);
159 ret = 1;
160 munmap ((void *)large_buf, mmap_size);
161 return;
162 }
163 }
164 }
165 dest = large_buf + region_size + 2 * page_size + align1;
166 src = large_buf + align2;
167 }
168 munmap ((void *)large_buf, mmap_size);
169 }
170