string/test-memmove.c

   1 /* Test and measure memmove functions.
   2    Copyright (C) 1999-2018 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 #define TEST_MAIN
  21 #ifdef TEST_BCOPY
  22 # define TEST_NAME "bcopy"
  23 #else
  24 # define TEST_NAME "memmove"
  25 #endif
  26 #include "test-string.h"
  27 #include <support/test-driver.h>
  28
  29 char *simple_memmove (char *, const char *, size_t);
  30
  31 #ifdef TEST_BCOPY
  32 typedef void (*proto_t) (const char *, char *, size_t);
  33 void simple_bcopy (const char *, char *, size_t);
  34
  35 IMPL (simple_bcopy, 0)
  36 IMPL (bcopy, 1)
  37
  38 void
  39 simple_bcopy (const char *src, char *dst, size_t n)
  40 {
  41   simple_memmove (dst, src, n);
  42 }
  43 #else
  44 typedef char *(*proto_t) (char *, const char *, size_t);
  45
  46 IMPL (simple_memmove, 0)
  47 IMPL (memmove, 1)
  48 #endif
  49
  50 char *
  51 inhibit_loop_to_libcall
  52 simple_memmove (char *dst, const char *src, size_t n)
  53 {
  54   char *ret = dst;
  55   if (src < dst)
  56     {
  57       dst += n;
  58       src += n;
  59       while (n--)
  60         *--dst = *--src;
  61     }
  62   else
  63     while (n--)
  64       *dst++ = *src++;
  65   return ret;
  66 }
  67
  68 static void
  69 do_one_test (impl_t *impl, char *dst, char *src, const char *orig_src,
  70              size_t len)
  71 {
  72   /* This also clears the destination buffer set by the previous run.  */
  73   memcpy (src, orig_src, len);
  74 #ifdef TEST_BCOPY
  75   CALL (impl, src, dst, len);
  76 #else
  77   char *res;
  78
  79   res = CALL (impl, dst, src, len);
  80   if (res != dst)
  81     {
  82       error (0, 0, "Wrong result in function %s %p %p", impl->name,
  83              res, dst);
  84       ret = 1;
  85       return;
  86     }
  87 #endif
  88
  89   if (memcmp (dst, orig_src, len) != 0)
  90     {
  91       error (0, 0, "Wrong result in function %s dst \"%s\" src \"%s\"",
  92              impl->name, dst, src);
  93       ret = 1;
  94       return;
  95     }
  96 }
  97
  98 static void
  99 do_test (size_t align1, size_t align2, size_t len)
 100 {
 101   size_t i, j;
 102   char *s1, *s2;
 103
 104   align1 &= 63;
 105   if (align1 + len >= page_size)
 106     return;
 107
 108   align2 &= 63;
 109   if (align2 + len >= page_size)
 110     return;
 111
 112   s1 = (char *) (buf1 + align1);
 113   s2 = (char *) (buf2 + align2);
 114
 115   for (i = 0, j = 1; i < len; i++, j += 23)
 116     s1[i] = j;
 117
 118   FOR_EACH_IMPL (impl, 0)
 119     do_one_test (impl, s2, (char *) (buf2 + align1), s1, len);
 120 }
 121
 122 static void
 123 do_random_tests (void)
 124 {
 125   size_t i, n, align1, align2, len, size;
 126   size_t srcstart, srcend, dststart, dstend;
 127   int c;
 128   unsigned char *p1, *p2;
 129 #ifndef TEST_BCOPY
 130   unsigned char *res;
 131 #endif
 132
 133   for (n = 0; n < ITERATIONS; n++)
 134     {
 135       if ((random () & 255) == 0)
 136         size = 65536;
 137       else
 138         size = 512;
 139       if (size > page_size)
 140         size = page_size;
 141       if ((random () & 3) == 0)
 142         {
 143           len = random () & (size - 1);
 144           align1 = size - len - (random () & 31);
 145           align2 = size - len - (random () & 31);
 146           if (align1 > size)
 147             align1 = 0;
 148           if (align2 > size)
 149             align2 = 0;
 150         }
 151       else
 152         {
 153           align1 = random () & (size / 2 - 1);
 154           align2 = random () & (size / 2 - 1);
 155           len = random () & (size - 1);
 156           if (align1 + len > size)
 157             align1 = size - len;
 158           if (align2 + len > size)
 159             align2 = size - len;
 160         }
 161
 162       p1 = buf1 + page_size - size;
 163       p2 = buf2 + page_size - size;
 164       c = random () & 255;
 165       srcend = align1 + len + 256;
 166       if (srcend > size)
 167         srcend = size;
 168       if (align1 > 256)
 169         srcstart = align1 - 256;
 170       else
 171         srcstart = 0;
 172       for (i = srcstart; i < srcend; ++i)
 173         p1[i] = random () & 255;
 174       dstend = align2 + len + 256;
 175       if (dstend > size)
 176         dstend = size;
 177       if (align2 > 256)
 178         dststart = align2 - 256;
 179       else
 180         dststart = 0;
 181
 182       FOR_EACH_IMPL (impl, 1)
 183         {
 184           memset (p2 + dststart, c, dstend - dststart);
 185           memcpy (p2 + srcstart, p1 + srcstart, srcend - srcstart);
 186 #ifdef TEST_BCOPY
 187           CALL (impl, (char *) (p2 + align1), (char *) (p2 + align2), len);
 188 #else
 189           res = (unsigned char *) CALL (impl,
 190                                         (char *) (p2 + align2),
 191                                         (char *) (p2 + align1), len);
 192           if (res != p2 + align2)
 193             {
 194               error (0, 0, "Iteration %zd - wrong result in function %s (%zd, %zd, %zd) %p != %p",
 195                      n, impl->name, align1, align2, len, res, p2 + align2);
 196               ret = 1;
 197             }
 198 #endif
 199           if (memcmp (p1 + align1, p2 + align2, len))
 200             {
 201               error (0, 0, "Iteration %zd - different strings, %s (%zd, %zd, %zd)",
 202                      n, impl->name, align1, align2, len);
 203               ret = 1;
 204             }
 205           for (i = dststart; i < dstend; ++i)
 206             {
 207               if (i >= align2 && i < align2 + len)
 208                 {
 209                   i = align2 + len - 1;
 210                   continue;
 211                 }
 212               if (i >= srcstart && i < srcend)
 213                 {
 214                   i = srcend - 1;
 215                   continue;
 216                 }
 217               if (p2[i] != c)
 218                 {
 219                   error (0, 0, "Iteration %zd - garbage in memset area, %s (%zd, %zd, %zd)",
 220                          n, impl->name, align1, align2, len);
 221                   ret = 1;
 222                   break;
 223                 }
 224             }
 225
 226           if (srcstart < align2
 227               && memcmp (p2 + srcstart, p1 + srcstart,
 228                          (srcend > align2 ? align2 : srcend) - srcstart))
 229             {
 230               error (0, 0, "Iteration %zd - garbage before dst, %s (%zd, %zd, %zd)",
 231                      n, impl->name, align1, align2, len);
 232               ret = 1;
 233               break;
 234             }
 235
 236           i = srcstart > align2 + len ? srcstart : align2 + len;
 237           if (srcend > align2 + len
 238               && memcmp (p2 + i, p1 + i, srcend - i))
 239             {
 240               error (0, 0, "Iteration %zd - garbage after dst, %s (%zd, %zd, %zd)",
 241                      n, impl->name, align1, align2, len);
 242               ret = 1;
 243               break;
 244             }
 245         }
 246     }
 247 }
 248
 249 static void
 250 do_test2 (void)
 251 {
 252   size_t size = 0x20000000;
 253   uint32_t * large_buf;
 254
 255   large_buf = mmap ((void*) 0x70000000, size, PROT_READ | PROT_WRITE,
 256                     MAP_PRIVATE | MAP_ANON, -1, 0);
 257
 258   if (large_buf == MAP_FAILED)
 259     error (EXIT_UNSUPPORTED, errno, "Large mmap failed");
 260
 261   if ((uintptr_t) large_buf > 0x80000000 - 128
 262       || 0x80000000 - (uintptr_t) large_buf > 0x20000000)
 263     {
 264       error (0, 0, "Large mmap allocated improperly");
 265       ret = EXIT_UNSUPPORTED;
 266       munmap ((void *) large_buf, size);
 267       return;
 268     }
 269
 270   size_t bytes_move = 0x80000000 - (uintptr_t) large_buf;
 271   size_t arr_size = bytes_move / sizeof (uint32_t);
 272   size_t i;
 273
 274   FOR_EACH_IMPL (impl, 0)
 275     {
 276       for (i = 0; i < arr_size; i++)
 277         large_buf[i] = (uint32_t) i;
 278
 279       uint32_t * dst = &large_buf[33];
 280
 281 #ifdef TEST_BCOPY
 282       CALL (impl, (char *) large_buf, (char *) dst, bytes_move);
 283 #else
 284       CALL (impl, (char *) dst, (char *) large_buf, bytes_move);
 285 #endif
 286
 287       for (i = 0; i < arr_size; i++)
 288         {
 289           if (dst[i] != (uint32_t) i)
 290             {
 291               error (0, 0,
 292                      "Wrong result in function %s dst \"%p\" src \"%p\" offset \"%zd\"",
 293                      impl->name, dst, large_buf, i);
 294               ret = 1;
 295               break;
 296             }
 297         }
 298     }
 299
 300   munmap ((void *) large_buf, size);
 301 }
 302
 303 int
 304 test_main (void)
 305 {
 306   size_t i;
 307
 308   test_init ();
 309
 310   printf ("%23s", "");
 311   FOR_EACH_IMPL (impl, 0)
 312     printf ("\t%s", impl->name);
 313   putchar ('\n');
 314
 315   for (i = 0; i < 14; ++i)
 316     {
 317       do_test (0, 32, 1 << i);
 318       do_test (32, 0, 1 << i);
 319       do_test (0, i, 1 << i);
 320       do_test (i, 0, 1 << i);
 321     }
 322
 323   for (i = 0; i < 32; ++i)
 324     {
 325       do_test (0, 32, i);
 326       do_test (32, 0, i);
 327       do_test (0, i, i);
 328       do_test (i, 0, i);
 329     }
 330
 331   for (i = 3; i < 32; ++i)
 332     {
 333       if ((i & (i - 1)) == 0)
 334         continue;
 335       do_test (0, 32, 16 * i);
 336       do_test (32, 0, 16 * i);
 337       do_test (0, i, 16 * i);
 338       do_test (i, 0, 16 * i);
 339     }
 340
 341   do_random_tests ();
 342
 343   do_test2 ();
 344
 345   return ret;
 346 }
 347
 348 #include <support/test-driver.c>