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