elf/tst-tlsalign.c

   1 /* Test for large alignment in TLS blocks, BZ#18383.
   2    Copyright (C) 2015-2020 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 #include <stdint.h>
  20 #include <stdio.h>
  21 #include <stdlib.h>
  22
  23 static __thread int tdata1 = 1;
  24 static __thread int tdata2 __attribute__ ((aligned (0x10))) = 2;
  25 static __thread int tdata3 __attribute__ ((aligned (0x1000))) = 4;
  26 static __thread int tbss1;
  27 static __thread int tbss2 __attribute__ ((aligned (0x10)));
  28 static __thread int tbss3 __attribute__ ((aligned (0x1000)));
  29
  30 #ifndef NO_LIB
  31 extern __thread int mod_tdata1;
  32 extern __thread int mod_tdata2;
  33 extern __thread int mod_tdata3;
  34 extern __thread int mod_tbss1;
  35 extern __thread int mod_tbss2;
  36 extern __thread int mod_tbss3;
  37 #endif
  38
  39 static int
  40 test_one (const char *which, unsigned int alignment, int *var, int value)
  41 {
  42   uintptr_t addr = (uintptr_t) var;
  43   unsigned int misalign = addr & (alignment - 1);
  44
  45   printf ("%s TLS address %p %% %u = %u\n",
  46           which, (void *) var, alignment, misalign);
  47
  48   int got = *var;
  49   if (got != value)
  50     {
  51       printf ("%s value %d should be %d\n", which, got, value);
  52       return 1;
  53     }
  54
  55   return misalign != 0;
  56 }
  57
  58 static int
  59 do_test (void)
  60 {
  61   int fail = 0;
  62
  63   fail |= test_one ("tdata1", 4, &tdata1, 1);
  64   fail |= test_one ("tdata2", 0x10, &tdata2, 2);
  65   fail |= test_one ("tdata3", 0x1000, &tdata3, 4);
  66
  67   fail |= test_one ("tbss1", 4, &tbss1, 0);
  68   fail |= test_one ("tbss2", 0x10, &tbss2, 0);
  69   fail |= test_one ("tbss3", 0x1000, &tbss3, 0);
  70
  71 #ifndef NO_LIB
  72   fail |= test_one ("mod_tdata1", 4, &mod_tdata1, 1);
  73   fail |= test_one ("mod_tdata2", 0x10, &mod_tdata2, 2);
  74   fail |= test_one ("mod_tdata3", 0x1000, &mod_tdata3, 4);
  75
  76   fail |= test_one ("mod_tbss1", 4, &mod_tbss1, 0);
  77   fail |= test_one ("mod_tbss2", 0x10, &mod_tbss2, 0);
  78   fail |= test_one ("mod_tbss3", 0x1000, &mod_tbss3, 0);
  79 #endif
  80
  81   return fail ? EXIT_FAILURE : EXIT_SUCCESS;
  82 }
  83
  84 #include <support/test-driver.c>