text: /* Test for large alignment in TLS blocks (extern case), BZ#18383.
     Copyright (C) 2015-2020 Free Software Foundation, Inc.
     This file is part of the GNU C Library.
  
     The GNU C Library is free software; you can redistribute it and/or
     modify it under the terms of the GNU Lesser General Public
     License as published by the Free Software Foundation; either
     version 2.1 of the License, or (at your option) any later version.
  
     The GNU C Library is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     Lesser General Public License for more details.
  
     You should have received a copy of the GNU Lesser General Public
     License along with the GNU C Library; if not, see
     <https://www.gnu.org/licenses/>.  */
  
  #include <stdint.h>
  #include <stdio.h>
  #include <stdlib.h>
  
  /* This is the same as tst-tlsalign-static.c, except that it uses
     TLS variables that are defined in a separate translation unit
     (ts-tlsalign-vars.c).  It turned out that the cause of BZ#18383
     on ARM was actually an ARM assembler bug triggered by the ways of
     using .tdata/.tbss sections and relocs referring to them that GCC
     chooses when the variables are defined in the same translation
     unit that contains the references.  */
  
  extern __thread int tdata1;
  extern __thread int tdata2;
  extern __thread int tdata3;
  extern __thread int tbss1;
  extern __thread int tbss2;
  extern __thread int tbss3;
  
  static int
  test_one (const char *which, unsigned int alignment, int *var, int value)
  {
    uintptr_t addr = (uintptr_t) var;
    unsigned int misalign = addr & (alignment - 1);
  
    printf ("%s TLS address %p %% %u = %u\n",
  	  which, (void *) var, alignment, misalign);
  
    int got = *var;
    if (got != value)
      {
        printf ("%s value %d should be %d\n", which, got, value);
        return 1;
      }
  
    return misalign != 0;
  }
  
  static int
  do_test (void)
  {
    int fail = 0;
  
    fail |= test_one ("tdata1", 4, &tdata1, 1);
    fail |= test_one ("tdata2", 0x10, &tdata2, 2);
    fail |= test_one ("tdata3", 0x1000, &tdata3, 4);
  
    fail |= test_one ("tbss1", 4, &tbss1, 0);
    fail |= test_one ("tbss2", 0x10, &tbss2, 0);
    fail |= test_one ("tbss3", 0x1000, &tbss3, 0);
  
    return fail ? EXIT_FAILURE : EXIT_SUCCESS;
  }
  
  #include <support/test-driver.c>
  