1/* Test for large alignment in TLS blocks, BZ#18383.
2 Copyright (C) 2015-2022 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
23static __thread int tdata1 = 1;
24static __thread int tdata2 __attribute__ ((aligned (0x10))) = 2;
25static __thread int tdata3 __attribute__ ((aligned (0x1000))) = 4;
26static __thread int tbss1;
27static __thread int tbss2 __attribute__ ((aligned (0x10)));
28static __thread int tbss3 __attribute__ ((aligned (0x1000)));
29
30#ifndef NO_LIB
31extern __thread int mod_tdata1;
32extern __thread int mod_tdata2;
33extern __thread int mod_tdata3;
34extern __thread int mod_tbss1;
35extern __thread int mod_tbss2;
36extern __thread int mod_tbss3;
37#endif
38
39static int
40test_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 (format: "%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 (format: "%s value %d should be %d\n", which, got, value);
52 return 1;
53 }
54
55 return misalign != 0;
56}
57
58static int
59do_test (void)
60{
61 int fail = 0;
62
63 fail |= test_one (which: "tdata1", alignment: 4, var: &tdata1, value: 1);
64 fail |= test_one (which: "tdata2", alignment: 0x10, var: &tdata2, value: 2);
65 fail |= test_one (which: "tdata3", alignment: 0x1000, var: &tdata3, value: 4);
66
67 fail |= test_one (which: "tbss1", alignment: 4, var: &tbss1, value: 0);
68 fail |= test_one (which: "tbss2", alignment: 0x10, var: &tbss2, value: 0);
69 fail |= test_one (which: "tbss3", alignment: 0x1000, var: &tbss3, value: 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>
85

source code of glibc/elf/tst-tlsalign.c