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glibc/elf/tst-tlsalign-extern.c
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/* Test for large alignment in TLS blocks (extern case), BZ#18383. | |
Copyright (C) 2015-2016 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; | |
} | |
#define TEST_FUNCTION do_test () | |
#include "../test-skeleton.c" |