string/test-memmove.c

   1 /* Test and measure memmove functions.
   2    Copyright (C) 1999-2024 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 #define TEST_MAIN
  20 #ifdef TEST_BCOPY
  21 # define TEST_NAME "bcopy"
  22 #else
  23 # define TEST_NAME "memmove"
  24 #endif
  25 #include "test-string.h"
  26 #include <support/test-driver.h>
  27
  28 char *simple_memmove (char *, const char *, size_t);
  29
  30 #ifdef TEST_BCOPY
  31 typedef void (*proto_t) (const char *, char *, size_t);
  32
  33 IMPL (bcopy, 1)
  34
  35 /* Naive implementation to verify results.  */
  36 void
  37 simple_bcopy (const char *src, char *dst, size_t n)
  38 {
  39   simple_memmove (dst, src, n);
  40 }
  41
  42 #else
  43 typedef char *(*proto_t) (char *, const char *, size_t);
  44
  45 IMPL (memmove, 1)
  46 #endif
  47
  48 /* Naive implementation to verify results.  */
  49 char *
  50 inhibit_loop_to_libcall
  51 simple_memmove (char *dst, const char *src, size_t n)
  52 {
  53   char *ret = dst;
  54   if (src < dst)
  55     {
  56       dst += n;
  57       src += n;
  58       while (n--)
  59         *--dst = *--src;
  60     }
  61   else
  62     while (n--)
  63       *dst++ = *src++;
  64   return ret;
  65 }
  66
  67 static void
  68 do_one_test (impl_t *impl, char *dst, char *src, const char *orig_src,
  69              size_t len)
  70 {
  71   /* This also clears the destination buffer set by the previous run.  */
  72   memcpy (src, orig_src, len);
  73 #ifdef TEST_BCOPY
  74   CALL (impl, src, dst, len);
  75 #else
  76   char *res;
  77
  78   res = CALL (impl, dst, src, len);
  79   if (res != dst)
  80     {
  81       error (0, 0, "Wrong result in function %s %p %p", impl->name,
  82              res, dst);
  83       ret = 1;
  84       return;
  85     }
  86 #endif
  87
  88   if (memcmp (dst, orig_src, len) != 0)
  89     {
  90       error (0, 0, "Wrong result in function %s dst \"%s\" src \"%s\"",
  91              impl->name, dst, src);
  92       ret = 1;
  93       return;
  94     }
  95 }
  96
  97 static void
  98 do_test (size_t align1, size_t align2, size_t len)
  99 {
 100   size_t i, j;
 101   char *s1, *s2;
 102
 103   align1 &= (getpagesize() - 1);
 104   if (align1 + len >= page_size)
 105     return;
 106
 107   align2 &= (getpagesize() - 1);
 108   if (align2 + len >= page_size)
 109     return;
 110
 111   s1 = (char *) (buf1 + align1);
 112   s2 = (char *) (buf2 + align2);
 113
 114   for (i = 0, j = 1; i < len; i++, j += 23)
 115     s1[i] = j;
 116
 117   FOR_EACH_IMPL (impl, 0)
 118     do_one_test (impl, s2, (char *) (buf2 + align1), s1, len);
 119 }
 120
 121 static void
 122 do_random_tests (void)
 123 {
 124   size_t i, n, align1, align2, len, size;
 125   size_t srcstart, srcend, dststart, dstend;
 126   int c;
 127   unsigned char *p1, *p2;
 128 #ifndef TEST_BCOPY
 129   unsigned char *res;
 130 #endif
 131
 132   for (n = 0; n < ITERATIONS; n++)
 133     {
 134       if ((random () & 255) == 0)
 135         size = 65536;
 136       else
 137         size = 512;
 138       if (size > page_size)
 139         size = page_size;
 140       if ((random () & 3) == 0)
 141         {
 142           len = random () & (size - 1);
 143           align1 = size - len - (random () & 31);
 144           align2 = size - len - (random () & 31);
 145           if (align1 > size)
 146             align1 = 0;
 147           if (align2 > size)
 148             align2 = 0;
 149         }
 150       else
 151         {
 152           align1 = random () & (size / 2 - 1);
 153           align2 = random () & (size / 2 - 1);
 154           len = random () & (size - 1);
 155           if (align1 + len > size)
 156             align1 = size - len;
 157           if (align2 + len > size)
 158             align2 = size - len;
 159         }
 160
 161       p1 = buf1 + page_size - size;
 162       p2 = buf2 + page_size - size;
 163       c = random () & 255;
 164       srcend = align1 + len + 256;
 165       if (srcend > size)
 166         srcend = size;
 167       if (align1 > 256)
 168         srcstart = align1 - 256;
 169       else
 170         srcstart = 0;
 171       for (i = srcstart; i < srcend; ++i)
 172         p1[i] = random () & 255;
 173       dstend = align2 + len + 256;
 174       if (dstend > size)
 175         dstend = size;
 176       if (align2 > 256)
 177         dststart = align2 - 256;
 178       else
 179         dststart = 0;
 180
 181       FOR_EACH_IMPL (impl, 1)
 182         {
 183           memset (p2 + dststart, c, dstend - dststart);
 184           memcpy (p2 + srcstart, p1 + srcstart, srcend - srcstart);
 185 #ifdef TEST_BCOPY
 186           CALL (impl, (char *) (p2 + align1), (char *) (p2 + align2), len);
 187 #else
 188           res = (unsigned char *) CALL (impl,
 189                                         (char *) (p2 + align2),
 190                                         (char *) (p2 + align1), len);
 191           if (res != p2 + align2)
 192             {
 193               error (0, 0, "Iteration %zd - wrong result in function %s (%zd, %zd, %zd) %p != %p",
 194                      n, impl->name, align1, align2, len, res, p2 + align2);
 195               ret = 1;
 196             }
 197 #endif
 198           if (memcmp (p1 + align1, p2 + align2, len))
 199             {
 200               error (0, 0, "Iteration %zd - different strings, %s (%zd, %zd, %zd)",
 201                      n, impl->name, align1, align2, len);
 202               ret = 1;
 203             }
 204           for (i = dststart; i < dstend; ++i)
 205             {
 206               if (i >= align2 && i < align2 + len)
 207                 {
 208                   i = align2 + len - 1;
 209                   continue;
 210                 }
 211               if (i >= srcstart && i < srcend)
 212                 {
 213                   i = srcend - 1;
 214                   continue;
 215                 }
 216               if (p2[i] != c)
 217                 {
 218                   error (0, 0, "Iteration %zd - garbage in memset area, %s (%zd, %zd, %zd)",
 219                          n, impl->name, align1, align2, len);
 220                   ret = 1;
 221                   break;
 222                 }
 223             }
 224
 225           if (srcstart < align2
 226               && memcmp (p2 + srcstart, p1 + srcstart,
 227                          (srcend > align2 ? align2 : srcend) - srcstart))
 228             {
 229               error (0, 0, "Iteration %zd - garbage before dst, %s (%zd, %zd, %zd)",
 230                      n, impl->name, align1, align2, len);
 231               ret = 1;
 232               break;
 233             }
 234
 235           i = srcstart > align2 + len ? srcstart : align2 + len;
 236           if (srcend > align2 + len
 237               && memcmp (p2 + i, p1 + i, srcend - i))
 238             {
 239               error (0, 0, "Iteration %zd - garbage after dst, %s (%zd, %zd, %zd)",
 240                      n, impl->name, align1, align2, len);
 241               ret = 1;
 242               break;
 243             }
 244         }
 245     }
 246 }
 247
 248 static void
 249 do_test2 (size_t offset)
 250 {
 251   size_t size = 0x20000000;
 252   uint32_t * large_buf;
 253
 254   large_buf = mmap ((void*) 0x70000000, size, PROT_READ | PROT_WRITE,
 255                     MAP_PRIVATE | MAP_ANON, -1, 0);
 256
 257   if (large_buf == MAP_FAILED)
 258     error (EXIT_UNSUPPORTED, errno, "Large mmap failed");
 259
 260   if ((uintptr_t) large_buf > 0x80000000 - 128
 261       || 0x80000000 - (uintptr_t) large_buf > 0x20000000)
 262     {
 263       error (0, 0, "Large mmap allocated improperly");
 264       ret = EXIT_UNSUPPORTED;
 265       munmap ((void *) large_buf, size);
 266       return;
 267     }
 268
 269   size_t bytes_move = 0x80000000 - (uintptr_t) large_buf;
 270   if (bytes_move + offset * sizeof (uint32_t) > size)
 271     {
 272       munmap ((void *) large_buf, size);
 273       return;
 274     }
 275   size_t arr_size = bytes_move / sizeof (uint32_t);
 276   size_t i;
 277   size_t repeats;
 278   uint32_t * src = large_buf;
 279   uint32_t * dst = &large_buf[offset];
 280   for (repeats = 0; repeats < 2; ++repeats)
 281     {
 282       FOR_EACH_IMPL (impl, 0)
 283         {
 284           for (i = 0; i < arr_size; i++)
 285             src[i] = (uint32_t) i;
 286
 287
 288 #ifdef TEST_BCOPY
 289           CALL (impl, (char *) src, (char *) dst, bytes_move);
 290 #else
 291           CALL (impl, (char *) dst, (char *) src, bytes_move);
 292 #endif
 293
 294           for (i = 0; i < arr_size; i++)
 295             {
 296               if (dst[i] != (uint32_t) i)
 297                 {
 298                   error (0, 0,
 299                          "Wrong result in function %s dst \"%p\" src \"%p\" offset \"%zd\"",
 300                          impl->name, dst, src, i);
 301                   ret = 1;
 302                   munmap ((void *) large_buf, size);
 303                   return;
 304                 }
 305             }
 306         }
 307       src = dst;
 308       dst = large_buf;
 309     }
 310
 311   munmap ((void *) large_buf, size);
 312 }
 313
 314 static void
 315 do_test3 (size_t bytes_move, size_t offset)
 316 {
 317   size_t size = bytes_move * 3;
 318   uint32_t *buf;
 319
 320   buf = mmap (NULL, size, PROT_READ | PROT_WRITE,
 321               MAP_PRIVATE | MAP_ANON, -1, 0);
 322
 323   if (buf == MAP_FAILED)
 324     error (EXIT_UNSUPPORTED, errno, "mmap failed");
 325
 326   size_t arr_size = bytes_move / sizeof (uint32_t);
 327   size_t i;
 328
 329   FOR_EACH_IMPL (impl, 0)
 330     {
 331       for (i = 0; i < arr_size; i++)
 332         buf[i] = (uint32_t) i;
 333
 334       uint32_t *dst = &buf[arr_size + offset];
 335
 336 #ifdef TEST_BCOPY
 337       CALL (impl, (char *) buf, (char *) dst, bytes_move);
 338 #else
 339       CALL (impl, (char *) dst, (char *) buf, bytes_move);
 340 #endif
 341
 342       for (i = 0; i < arr_size; i++)
 343         {
 344           if (dst[i] != (uint32_t) i)
 345             {
 346               error (0, 0,
 347                      "Wrong result in function %s dst \"%p\" src \"%p\" offset \"%zd\"",
 348                      impl->name, dst, buf, i);
 349               ret = 1;
 350               break;
 351             }
 352         }
 353     }
 354
 355   munmap ((void *) buf, size);
 356 }
 357
 358 static void
 359 do_test4 (size_t bytes_move, size_t offset1, size_t offset2)
 360 {
 361   size_t size, repeats, i;
 362   uint8_t *buf, *dst, *src;
 363
 364   size = bytes_move + MAX(offset1, offset2);
 365   buf  = mmap(NULL, size, PROT_READ | PROT_WRITE,
 366              MAP_PRIVATE | MAP_ANON, -1, 0);
 367
 368   if (buf == MAP_FAILED)
 369     error (EXIT_UNSUPPORTED, errno, "mmap failed");
 370
 371   dst = &buf[offset1];
 372   src = &buf[offset2];
 373   for (repeats = 0; repeats < 2; ++repeats)
 374     {
 375       FOR_EACH_IMPL (impl, 0)
 376         {
 377           for (i = 0; i < bytes_move; i++)
 378               src[i] = (uint8_t) i;
 379 #ifdef TEST_BCOPY
 380           CALL (impl, (char *) src, (char *) dst, bytes_move);
 381 #else
 382           CALL (impl, (char *) dst, (char *) src, bytes_move);
 383 #endif
 384           for (i = 0; i < bytes_move; i++)
 385             {
 386               if (dst[i] != (uint8_t) i)
 387                 {
 388                   error (0, 0,
 389                          "Wrong result in function %s dst \"%p\" src \"%p\" offset \"%zd\"",
 390                          impl->name, dst, buf, i);
 391                   ret = 1;
 392                   break;
 393                 }
 394             }
 395         }
 396       dst = &buf[offset2];
 397       src = &buf[offset1];
 398     }
 399   munmap ((void *) buf, size);
 400 }
 401
 402
 403 int
 404 test_main (void)
 405 {
 406   size_t i;
 407
 408   test_init ();
 409
 410   printf ("%23s", "");
 411   FOR_EACH_IMPL (impl, 0)
 412     printf ("\t%s", impl->name);
 413   putchar ('\n');
 414
 415   for (i = 0; i < 14; ++i)
 416     {
 417       do_test (0, 32, 1 << i);
 418       do_test (32, 0, 1 << i);
 419       do_test (0, i, 1 << i);
 420       do_test (i, 0, 1 << i);
 421     }
 422
 423   for (i = 0; i < 32; ++i)
 424     {
 425       do_test (0, 32, i);
 426       do_test (32, 0, i);
 427       do_test (0, i, i);
 428       do_test (i, 0, i);
 429     }
 430
 431   for (i = 3; i < 32; ++i)
 432     {
 433       if ((i & (i - 1)) == 0)
 434         continue;
 435       do_test (0, 32, 16 * i);
 436       do_test (32, 0, 16 * i);
 437       do_test (0, i, 16 * i);
 438       do_test (i, 0, 16 * i);
 439     }
 440
 441   do_random_tests ();
 442
 443   do_test2 (0);
 444   do_test2 (33);
 445   do_test2 (0x200000 - 1);
 446   do_test2 (0x200000);
 447   do_test2 (0x200000 + 1);
 448   do_test2 (0x1000000 - 1);
 449   do_test2 (0x1000000);
 450   do_test2 (0x1000000 + 1);
 451   do_test2 (0x4000000 - 1);
 452   do_test2 (0x4000000);
 453   do_test2 (0x4000000 + 1);
 454
 455   /* Copy 16KB data.  */
 456   do_test3 (16384, 3);
 457   for (i = 4096; i <= 16384; i <<= 1)
 458     {
 459       do_test4 (i, 0, i);
 460       do_test4 (i, 0, i - 1);
 461       do_test4 (i, 0, i + 1);
 462       do_test4 (i, 63, i + 63);
 463       do_test4 (i, 63, i + 64);
 464       do_test4 (i, 63, i);
 465
 466       do_test4 (i, 0, 1);
 467       do_test4 (i, 0, 15);
 468       do_test4 (i, 0, 31);
 469       do_test4 (i, 0, 63);
 470       do_test4 (i, 0, 64);
 471       do_test4 (i, 0, 65);
 472       do_test4 (i, 0, 127);
 473       do_test4 (i, 0, 129);
 474     }
 475
 476
 477   return ret;
 478 }
 479
 480 #include <support/test-driver.c>