tests/test-mmap.c

   1 /*
   2  * Small test program to verify simulated mmap behaviour.
   3  *
   4  * When running qemu-linux-user with the -p flag, you may need to tell
   5  * this test program about the pagesize because getpagesize() will not reflect
   6  * the -p choice. Simply pass one argument beeing the pagesize.
   7  *
   8  * Copyright (c) 2007 AXIS Communications AB
   9  * Written by Edgar E. Iglesias.
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
  24  *  MA 02110-1301, USA.
  25  */
  26
  27 #include <stdio.h>
  28 #include <stdlib.h>
  29 #include <stdint.h>
  30 #include <string.h>
  31 #include <unistd.h>
  32
  33 #include <sys/mman.h>
  34
  35 #define D(x)
  36
  37 #define fail_unless(x)                                         \
  38 do                                                             \
  39 {                                                              \
  40   if (!(x)) {                                                  \
  41     fprintf (stderr, "FAILED at %s:%d\n", __FILE__, __LINE__); \
  42     exit (EXIT_FAILURE);                                       \
  43   }                                                            \
  44 } while (0);
  45
  46 unsigned char *dummybuf;
  47 static unsigned int pagesize;
  48 static unsigned int pagemask;
  49 int test_fd;
  50 size_t test_fsize;
  51
  52 void check_aligned_anonymous_unfixed_mmaps(void)
  53 {
  54         void *p1;
  55         void *p2;
  56         void *p3;
  57         void *p4;
  58         void *p5;
  59         uintptr_t p;
  60         int i;
  61
  62         fprintf (stderr, "%s", __func__);
  63         for (i = 0; i < 0x1fff; i++)
  64         {
  65                 size_t len;
  66
  67                 len = pagesize + (pagesize * i & 7);
  68                 p1 = mmap(NULL, len, PROT_READ,
  69                           MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
  70                 p2 = mmap(NULL, len, PROT_READ,
  71                           MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
  72                 p3 = mmap(NULL, len, PROT_READ,
  73                           MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
  74                 p4 = mmap(NULL, len, PROT_READ,
  75                           MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
  76                 p5 = mmap(NULL, len, PROT_READ,
  77                           MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
  78
  79                 /* Make sure we get pages aligned with the pagesize. The
  80                    target expects this.  */
  81                 fail_unless (p1 != MAP_FAILED);
  82                 fail_unless (p2 != MAP_FAILED);
  83                 fail_unless (p3 != MAP_FAILED);
  84                 fail_unless (p4 != MAP_FAILED);
  85                 fail_unless (p5 != MAP_FAILED);
  86                 p = (uintptr_t) p1;
  87                 D(printf ("p=%x\n", p));
  88                 fail_unless ((p & pagemask) == 0);
  89                 p = (uintptr_t) p2;
  90                 fail_unless ((p & pagemask) == 0);
  91                 p = (uintptr_t) p3;
  92                 fail_unless ((p & pagemask) == 0);
  93                 p = (uintptr_t) p4;
  94                 fail_unless ((p & pagemask) == 0);
  95                 p = (uintptr_t) p5;
  96                 fail_unless ((p & pagemask) == 0);
  97
  98                 /* Make sure we can read from the entire area.  */
  99                 memcpy (dummybuf, p1, pagesize);
 100                 memcpy (dummybuf, p2, pagesize);
 101                 memcpy (dummybuf, p3, pagesize);
 102                 memcpy (dummybuf, p4, pagesize);
 103                 memcpy (dummybuf, p5, pagesize);
 104
 105                 munmap (p1, len);
 106                 munmap (p2, len);
 107                 munmap (p3, len);
 108                 munmap (p4, len);
 109                 munmap (p5, len);
 110         }
 111         fprintf (stderr, " passed\n");
 112 }
 113
 114 void check_large_anonymous_unfixed_mmap(void)
 115 {
 116         void *p1;
 117         uintptr_t p;
 118         size_t len;
 119
 120         fprintf (stderr, "%s", __func__);
 121
 122         len = 0x02000000;
 123         p1 = mmap(NULL, len, PROT_READ,
 124                   MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
 125
 126         /* Make sure we get pages aligned with the pagesize. The
 127            target expects this.  */
 128         fail_unless (p1 != MAP_FAILED);
 129         p = (uintptr_t) p1;
 130         fail_unless ((p & pagemask) == 0);
 131
 132         /* Make sure we can read from the entire area.  */
 133         memcpy (dummybuf, p1, pagesize);
 134         munmap (p1, len);
 135         fprintf (stderr, " passed\n");
 136 }
 137
 138 void check_aligned_anonymous_unfixed_colliding_mmaps(void)
 139 {
 140         char *p1;
 141         char *p2;
 142         char *p3;
 143         uintptr_t p;
 144         int i;
 145
 146         fprintf (stderr, "%s", __func__);
 147         for (i = 0; i < 0x2fff; i++)
 148         {
 149                 int nlen;
 150                 p1 = mmap(NULL, pagesize, PROT_READ,
 151                           MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
 152                 fail_unless (p1 != MAP_FAILED);
 153                 p = (uintptr_t) p1;
 154                 fail_unless ((p & pagemask) == 0);
 155                 memcpy (dummybuf, p1, pagesize);
 156
 157                 p2 = mmap(NULL, pagesize, PROT_READ,
 158                           MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
 159                 fail_unless (p2 != MAP_FAILED);
 160                 p = (uintptr_t) p2;
 161                 fail_unless ((p & pagemask) == 0);
 162                 memcpy (dummybuf, p2, pagesize);
 163
 164
 165                 munmap (p1, pagesize);
 166                 nlen = pagesize * 8;
 167                 p3 = mmap(NULL, nlen, PROT_READ,
 168                           MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
 169
 170                 /* Check if the mmaped areas collide.  */
 171                 if (p3 < p2
 172                     && (p3 + nlen) > p2)
 173                         fail_unless (0);
 174
 175                 memcpy (dummybuf, p3, pagesize);
 176
 177                 /* Make sure we get pages aligned with the pagesize. The
 178                    target expects this.  */
 179                 fail_unless (p3 != MAP_FAILED);
 180                 p = (uintptr_t) p3;
 181                 fail_unless ((p & pagemask) == 0);
 182                 munmap (p2, pagesize);
 183                 munmap (p3, nlen);
 184         }
 185         fprintf (stderr, " passed\n");
 186 }
 187
 188 void check_aligned_anonymous_fixed_mmaps(void)
 189 {
 190         char *addr;
 191         void *p1;
 192         uintptr_t p;
 193         int i;
 194
 195         /* Find a suitable address to start with.  */
 196         addr = mmap(NULL, pagesize * 40, PROT_READ | PROT_WRITE,
 197                     MAP_PRIVATE | MAP_ANONYMOUS,
 198                     -1, 0);
 199         fprintf (stderr, "%s addr=%p", __func__, addr);
 200         fail_unless (addr != MAP_FAILED);
 201
 202         for (i = 0; i < 40; i++)
 203         {
 204                 /* Create submaps within our unfixed map.  */
 205                 p1 = mmap(addr, pagesize, PROT_READ,
 206                           MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED,
 207                           -1, 0);
 208                 /* Make sure we get pages aligned with the pagesize.
 209                    The target expects this.  */
 210                 p = (uintptr_t) p1;
 211                 fail_unless (p1 == addr);
 212                 fail_unless ((p & pagemask) == 0);
 213                 memcpy (dummybuf, p1, pagesize);
 214                 munmap (p1, pagesize);
 215                 addr += pagesize;
 216         }
 217         fprintf (stderr, " passed\n");
 218 }
 219
 220 void check_aligned_anonymous_fixed_mmaps_collide_with_host(void)
 221 {
 222         char *addr;
 223         void *p1;
 224         uintptr_t p;
 225         int i;
 226
 227         /* Find a suitable address to start with.  Right were the x86 hosts
 228          stack is.  */
 229         addr = ((void *)0x80000000);
 230         fprintf (stderr, "%s addr=%p", __func__, addr);
 231         fprintf (stderr, "FIXME: QEMU fails to track pages used by the host.");
 232
 233         for (i = 0; i < 20; i++)
 234         {
 235                 /* Create submaps within our unfixed map.  */
 236                 p1 = mmap(addr, pagesize, PROT_READ | PROT_WRITE,
 237                           MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED,
 238                           -1, 0);
 239                 /* Make sure we get pages aligned with the pagesize.
 240                    The target expects this.  */
 241                 p = (uintptr_t) p1;
 242                 fail_unless (p1 == addr);
 243                 fail_unless ((p & pagemask) == 0);
 244                 memcpy (p1, dummybuf, pagesize);
 245                 munmap (p1, pagesize);
 246                 addr += pagesize;
 247         }
 248         fprintf (stderr, " passed\n");
 249 }
 250
 251 void check_file_unfixed_mmaps(void)
 252 {
 253         unsigned int *p1, *p2, *p3;
 254         uintptr_t p;
 255         int i;
 256
 257         fprintf (stderr, "%s", __func__);
 258         for (i = 0; i < 0x10; i++)
 259         {
 260                 size_t len;
 261
 262                 len = pagesize;
 263                 p1 = mmap(NULL, len, PROT_READ,
 264                           MAP_PRIVATE,
 265                           test_fd, 0);
 266                 p2 = mmap(NULL, len, PROT_READ,
 267                           MAP_PRIVATE,
 268                           test_fd, pagesize);
 269                 p3 = mmap(NULL, len, PROT_READ,
 270                           MAP_PRIVATE,
 271                           test_fd, pagesize * 2);
 272
 273                 fail_unless (p1 != MAP_FAILED);
 274                 fail_unless (p2 != MAP_FAILED);
 275                 fail_unless (p3 != MAP_FAILED);
 276
 277                 /* Make sure we get pages aligned with the pagesize. The
 278                    target expects this.  */
 279                 p = (uintptr_t) p1;
 280                 fail_unless ((p & pagemask) == 0);
 281                 p = (uintptr_t) p2;
 282                 fail_unless ((p & pagemask) == 0);
 283                 p = (uintptr_t) p3;
 284                 fail_unless ((p & pagemask) == 0);
 285
 286                 /* Verify that the file maps was made correctly.  */
 287                 D(printf ("p1=%d p2=%d p3=%d\n", *p1, *p2, *p3));
 288                 fail_unless (*p1 == 0);
 289                 fail_unless (*p2 == (pagesize / sizeof *p2));
 290                 fail_unless (*p3 == ((pagesize * 2) / sizeof *p3));
 291
 292                 memcpy (dummybuf, p1, pagesize);
 293                 memcpy (dummybuf, p2, pagesize);
 294                 memcpy (dummybuf, p3, pagesize);
 295                 munmap (p1, len);
 296                 munmap (p2, len);
 297                 munmap (p3, len);
 298         }
 299         fprintf (stderr, " passed\n");
 300 }
 301
 302 void check_file_unfixed_eof_mmaps(void)
 303 {
 304         char *cp;
 305         unsigned int *p1;
 306         uintptr_t p;
 307         int i;
 308
 309         fprintf (stderr, "%s", __func__);
 310         for (i = 0; i < 0x10; i++)
 311         {
 312                 p1 = mmap(NULL, pagesize, PROT_READ,
 313                           MAP_PRIVATE,
 314                           test_fd,
 315                           (test_fsize - sizeof *p1) & ~pagemask);
 316
 317                 fail_unless (p1 != MAP_FAILED);
 318
 319                 /* Make sure we get pages aligned with the pagesize. The
 320                    target expects this.  */
 321                 p = (uintptr_t) p1;
 322                 fail_unless ((p & pagemask) == 0);
 323                 /* Verify that the file maps was made correctly.  */
 324                 fail_unless (p1[(test_fsize & pagemask) / sizeof *p1 - 1]
 325                              == ((test_fsize - sizeof *p1) / sizeof *p1));
 326
 327                 /* Verify that the end of page is accessable and zeroed.  */
 328                 cp = (void *) p1;
 329                 fail_unless (cp[pagesize - 4] == 0);
 330                 munmap (p1, pagesize);
 331         }
 332         fprintf (stderr, " passed\n");
 333 }
 334
 335 void check_file_fixed_eof_mmaps(void)
 336 {
 337         char *addr;
 338         char *cp;
 339         unsigned int *p1;
 340         uintptr_t p;
 341         int i;
 342
 343         /* Find a suitable address to start with.  */
 344         addr = mmap(NULL, pagesize * 44, PROT_READ,
 345                     MAP_PRIVATE | MAP_ANONYMOUS,
 346                     -1, 0);
 347
 348         fprintf (stderr, "%s addr=%p", __func__, (void *)addr);
 349         fail_unless (addr != MAP_FAILED);
 350
 351         for (i = 0; i < 0x10; i++)
 352         {
 353                 /* Create submaps within our unfixed map.  */
 354                 p1 = mmap(addr, pagesize, PROT_READ,
 355                           MAP_PRIVATE | MAP_FIXED,
 356                           test_fd,
 357                           (test_fsize - sizeof *p1) & ~pagemask);
 358
 359                 fail_unless (p1 != MAP_FAILED);
 360
 361                 /* Make sure we get pages aligned with the pagesize. The
 362                    target expects this.  */
 363                 p = (uintptr_t) p1;
 364                 fail_unless ((p & pagemask) == 0);
 365
 366                 /* Verify that the file maps was made correctly.  */
 367                 fail_unless (p1[(test_fsize & pagemask) / sizeof *p1 - 1]
 368                              == ((test_fsize - sizeof *p1) / sizeof *p1));
 369
 370                 /* Verify that the end of page is accessable and zeroed.  */
 371                 cp = (void *)p1;
 372                 fail_unless (cp[pagesize - 4] == 0);
 373                 munmap (p1, pagesize);
 374                 addr += pagesize;
 375         }
 376         fprintf (stderr, " passed\n");
 377 }
 378
 379 void check_file_fixed_mmaps(void)
 380 {
 381         unsigned char *addr;
 382         unsigned int *p1, *p2, *p3, *p4;
 383         int i;
 384
 385         /* Find a suitable address to start with.  */
 386         addr = mmap(NULL, pagesize * 40 * 4, PROT_READ,
 387                     MAP_PRIVATE | MAP_ANONYMOUS,
 388                     -1, 0);
 389         fprintf (stderr, "%s addr=%p", __func__, (void *)addr);
 390         fail_unless (addr != MAP_FAILED);
 391
 392         for (i = 0; i < 40; i++)
 393         {
 394                 p1 = mmap(addr, pagesize, PROT_READ,
 395                           MAP_PRIVATE | MAP_FIXED,
 396                           test_fd, 0);
 397                 p2 = mmap(addr + pagesize, pagesize, PROT_READ,
 398                           MAP_PRIVATE | MAP_FIXED,
 399                           test_fd, pagesize);
 400                 p3 = mmap(addr + pagesize * 2, pagesize, PROT_READ,
 401                           MAP_PRIVATE | MAP_FIXED,
 402                           test_fd, pagesize * 2);
 403                 p4 = mmap(addr + pagesize * 3, pagesize, PROT_READ,
 404                           MAP_PRIVATE | MAP_FIXED,
 405                           test_fd, pagesize * 3);
 406
 407                 /* Make sure we get pages aligned with the pagesize.
 408                    The target expects this.  */
 409                 fail_unless (p1 == (void *)addr);
 410                 fail_unless (p2 == (void *)addr + pagesize);
 411                 fail_unless (p3 == (void *)addr + pagesize * 2);
 412                 fail_unless (p4 == (void *)addr + pagesize * 3);
 413
 414                 /* Verify that the file maps was made correctly.  */
 415                 fail_unless (*p1 == 0);
 416                 fail_unless (*p2 == (pagesize / sizeof *p2));
 417                 fail_unless (*p3 == ((pagesize * 2) / sizeof *p3));
 418                 fail_unless (*p4 == ((pagesize * 3) / sizeof *p4));
 419
 420                 memcpy (dummybuf, p1, pagesize);
 421                 memcpy (dummybuf, p2, pagesize);
 422                 memcpy (dummybuf, p3, pagesize);
 423                 memcpy (dummybuf, p4, pagesize);
 424
 425                 munmap (p1, pagesize);
 426                 munmap (p2, pagesize);
 427                 munmap (p3, pagesize);
 428                 munmap (p4, pagesize);
 429                 addr += pagesize * 4;
 430         }
 431         fprintf (stderr, " passed\n");
 432 }
 433
 434 int main(int argc, char **argv)
 435 {
 436         char tempname[] = "/tmp/.cmmapXXXXXX";
 437         unsigned int i;
 438
 439         /* Trust the first argument, otherwise probe the system for our
 440            pagesize.  */
 441         if (argc > 1)
 442                 pagesize = strtoul(argv[1], NULL, 0);
 443         else
 444                 pagesize = sysconf(_SC_PAGESIZE);
 445
 446         /* Assume pagesize is a power of two.  */
 447         pagemask = pagesize - 1;
 448         dummybuf = malloc (pagesize);
 449         printf ("pagesize=%u pagemask=%x\n", pagesize, pagemask);
 450
 451         test_fd = mkstemp(tempname);
 452         unlink(tempname);
 453
 454         /* Fill the file with int's counting from zero and up.  */
 455         for (i = 0; i < (pagesize * 4) / sizeof i; i++)
 456                 write (test_fd, &i, sizeof i);
 457         /* Append a few extra writes to make the file end at non
 458            page boundary.  */
 459         write (test_fd, &i, sizeof i); i++;
 460         write (test_fd, &i, sizeof i); i++;
 461         write (test_fd, &i, sizeof i); i++;
 462
 463         test_fsize = lseek(test_fd, 0, SEEK_CUR);
 464
 465         /* Run the tests.  */
 466         check_aligned_anonymous_unfixed_mmaps();
 467         check_aligned_anonymous_unfixed_colliding_mmaps();
 468         check_aligned_anonymous_fixed_mmaps();
 469         check_file_unfixed_mmaps();
 470         check_file_fixed_mmaps();
 471         check_file_fixed_eof_mmaps();
 472         check_file_unfixed_eof_mmaps();
 473
 474         /* Fails at the moment.  */
 475         /* check_aligned_anonymous_fixed_mmaps_collide_with_host(); */
 476
 477         return EXIT_SUCCESS;
 478 }