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/* Test for large alignment in TLS blocks (extern case), BZ#18383.
Copyright (C) 2015-2023 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>
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