string/test-memcpy.c

   1 /* Test and measure memcpy functions.
   2    Copyright (C) 1999-2019 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Written by Jakub Jelinek <jakub@redhat.com>, 1999.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, see
  18    <http://www.gnu.org/licenses/>.  */
  19
  20 #ifndef MEMCPY_RESULT
  21 # define MEMCPY_RESULT(dst, len) dst
  22 # define MIN_PAGE_SIZE 131072
  23 # define TEST_MAIN
  24 # define TEST_NAME "memcpy"
  25 # include "test-string.h"
  26
  27 char *simple_memcpy (char *, const char *, size_t);
  28 char *builtin_memcpy (char *, const char *, size_t);
  29
  30 IMPL (simple_memcpy, 0)
  31 IMPL (builtin_memcpy, 0)
  32 IMPL (memcpy, 1)
  33
  34 char *
  35 simple_memcpy (char *dst, const char *src, size_t n)
  36 {
  37   char *ret = dst;
  38   while (n--)
  39     *dst++ = *src++;
  40   return ret;
  41 }
  42
  43 char *
  44 builtin_memcpy (char *dst, const char *src, size_t n)
  45 {
  46   return __builtin_memcpy (dst, src, n);
  47 }
  48 #endif
  49
  50 typedef char *(*proto_t) (char *, const char *, size_t);
  51
  52 static void
  53 do_one_test (impl_t *impl, char *dst, const char *src,
  54              size_t len)
  55 {
  56   size_t i;
  57
  58   /* Must clear the destination buffer set by the previous run.  */
  59   for (i = 0; i < len; i++)
  60     dst[i] = 0;
  61
  62   if (CALL (impl, dst, src, len) != MEMCPY_RESULT (dst, len))
  63     {
  64       error (0, 0, "Wrong result in function %s %p %p", impl->name,
  65              CALL (impl, dst, src, len), MEMCPY_RESULT (dst, len));
  66       ret = 1;
  67       return;
  68     }
  69
  70   if (memcmp (dst, src, len) != 0)
  71     {
  72       error (0, 0, "Wrong result in function %s dst %p \"%.*s\" src %p \"%.*s\" len %zu",
  73              impl->name, dst, (int) len, dst, src, (int) len, src, len);
  74       ret = 1;
  75       return;
  76     }
  77 }
  78
  79 static void
  80 do_test (size_t align1, size_t align2, size_t len)
  81 {
  82   size_t i, j;
  83   char *s1, *s2;
  84
  85   align1 &= 63;
  86   if (align1 + len >= page_size)
  87     return;
  88
  89   align2 &= 63;
  90   if (align2 + len >= page_size)
  91     return;
  92
  93   s1 = (char *) (buf1 + align1);
  94   s2 = (char *) (buf2 + align2);
  95
  96   for (i = 0, j = 1; i < len; i++, j += 23)
  97     s1[i] = j;
  98
  99   FOR_EACH_IMPL (impl, 0)
 100     do_one_test (impl, s2, s1, len);
 101 }
 102
 103 static void
 104 do_random_tests (void)
 105 {
 106   size_t i, j, n, align1, align2, len, size1, size2, size;
 107   int c;
 108   unsigned char *p1, *p2;
 109   unsigned char *res;
 110
 111   for (n = 0; n < ITERATIONS; n++)
 112     {
 113       if (n == 0)
 114         {
 115           len = getpagesize ();
 116           size = len + 512;
 117           size1 = size;
 118           size2 = size;
 119           align1 = 512;
 120           align2 = 512;
 121         }
 122       else
 123         {
 124           if ((random () & 255) == 0)
 125             size = 65536;
 126           else
 127             size = 768;
 128           if (size > page_size)
 129             size = page_size;
 130           size1 = size;
 131           size2 = size;
 132           i = random ();
 133           if (i & 3)
 134             size -= 256;
 135           if (i & 1)
 136             size1 -= 256;
 137           if (i & 2)
 138             size2 -= 256;
 139           if (i & 4)
 140             {
 141               len = random () % size;
 142               align1 = size1 - len - (random () & 31);
 143               align2 = size2 - len - (random () & 31);
 144               if (align1 > size1)
 145                 align1 = 0;
 146               if (align2 > size2)
 147                 align2 = 0;
 148             }
 149           else
 150             {
 151               align1 = random () & 63;
 152               align2 = random () & 63;
 153               len = random () % size;
 154               if (align1 + len > size1)
 155                 align1 = size1 - len;
 156               if (align2 + len > size2)
 157                 align2 = size2 - len;
 158             }
 159         }
 160       p1 = buf1 + page_size - size1;
 161       p2 = buf2 + page_size - size2;
 162       c = random () & 255;
 163       j = align1 + len + 256;
 164       if (j > size1)
 165         j = size1;
 166       for (i = 0; i < j; ++i)
 167         p1[i] = random () & 255;
 168
 169       FOR_EACH_IMPL (impl, 1)
 170         {
 171           j = align2 + len + 256;
 172           if (j > size2)
 173             j = size2;
 174           memset (p2, c, j);
 175           res = (unsigned char *) CALL (impl,
 176                                         (char *) (p2 + align2),
 177                                         (char *) (p1 + align1), len);
 178           if (res != MEMCPY_RESULT (p2 + align2, len))
 179             {
 180               error (0, 0, "Iteration %zd - wrong result in function %s (%zd, %zd, %zd) %p != %p",
 181                      n, impl->name, align1, align2, len, res,
 182                      MEMCPY_RESULT (p2 + align2, len));
 183               ret = 1;
 184             }
 185           for (i = 0; i < align2; ++i)
 186             {
 187               if (p2[i] != c)
 188                 {
 189                   error (0, 0, "Iteration %zd - garbage before, %s (%zd, %zd, %zd)",
 190                          n, impl->name, align1, align2, len);
 191                   ret = 1;
 192                   break;
 193                 }
 194             }
 195           for (i = align2 + len; i < j; ++i)
 196             {
 197               if (p2[i] != c)
 198                 {
 199                   error (0, 0, "Iteration %zd - garbage after, %s (%zd, %zd, %zd)",
 200                          n, impl->name, align1, align2, len);
 201                   ret = 1;
 202                   break;
 203                 }
 204             }
 205           if (memcmp (p1 + align1, p2 + align2, len))
 206             {
 207               error (0, 0, "Iteration %zd - different strings, %s (%zd, %zd, %zd)",
 208                      n, impl->name, align1, align2, len);
 209               ret = 1;
 210             }
 211         }
 212     }
 213 }
 214
 215 static void
 216 do_test1 (void)
 217 {
 218   size_t size = 0x100000;
 219   void *large_buf;
 220
 221   large_buf = mmap (NULL, size * 2 + page_size, PROT_READ | PROT_WRITE,
 222                     MAP_PRIVATE | MAP_ANON, -1, 0);
 223   if (large_buf == MAP_FAILED)
 224     {
 225       puts ("Failed to allocat large_buf, skipping do_test1");
 226       return;
 227     }
 228
 229   if (mprotect (large_buf + size, page_size, PROT_NONE))
 230     error (EXIT_FAILURE, errno, "mprotect failed");
 231
 232   size_t arrary_size = size / sizeof (uint32_t);
 233   uint32_t *dest = large_buf;
 234   uint32_t *src = large_buf + size + page_size;
 235   size_t i;
 236
 237   for (i = 0; i < arrary_size; i++)
 238     src[i] = (uint32_t) i;
 239
 240   FOR_EACH_IMPL (impl, 0)
 241     {
 242       memset (dest, -1, size);
 243       CALL (impl, (char *) dest, (char *) src, size);
 244       for (i = 0; i < arrary_size; i++)
 245         if (dest[i] != src[i])
 246           {
 247             error (0, 0,
 248                    "Wrong result in function %s dst \"%p\" src \"%p\" offset \"%zd\"",
 249                    impl->name, dest, src, i);
 250             ret = 1;
 251             break;
 252           }
 253     }
 254
 255   munmap ((void *) dest, size);
 256   munmap ((void *) src, size);
 257 }
 258
 259 int
 260 test_main (void)
 261 {
 262   size_t i;
 263
 264   test_init ();
 265
 266   printf ("%23s", "");
 267   FOR_EACH_IMPL (impl, 0)
 268     printf ("\t%s", impl->name);
 269   putchar ('\n');
 270
 271   for (i = 0; i < 18; ++i)
 272     {
 273       do_test (0, 0, 1 << i);
 274       do_test (i, 0, 1 << i);
 275       do_test (0, i, 1 << i);
 276       do_test (i, i, 1 << i);
 277     }
 278
 279   for (i = 0; i < 32; ++i)
 280     {
 281       do_test (0, 0, i);
 282       do_test (i, 0, i);
 283       do_test (0, i, i);
 284       do_test (i, i, i);
 285     }
 286
 287   for (i = 3; i < 32; ++i)
 288     {
 289       if ((i & (i - 1)) == 0)
 290         continue;
 291       do_test (0, 0, 16 * i);
 292       do_test (i, 0, 16 * i);
 293       do_test (0, i, 16 * i);
 294       do_test (i, i, 16 * i);
 295     }
 296
 297   do_test (0, 0, getpagesize ());
 298
 299   do_random_tests ();
 300
 301   do_test1 ();
 302
 303   return ret;
 304 }
 305
 306 #include <support/test-driver.c>