/* Test for large alignment in TLS blocks (extern case), BZ#18383.

   Copyright (C) 2015-2018 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

   <http://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>