string/test-memcpy-support.h

   1 /* Support for testing and measuring memcpy functions.
   2    Copyright (C) 1999-2022 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 *
  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 *
  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
  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
  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
 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 }