1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
|
/* Test that __tls_get_addr preserves caller-saved registers.
Copyright (C) 2025 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 <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <dlfcn.h>
#include <pthread.h>
#include <support/xdlfcn.h>
#include <support/xthread.h>
#include <support/check.h>
#include <support/test-driver.h>
#include <tst-tls23.h>
#ifndef IS_SUPPORTED
# define IS_SUPPORTED() true
#endif
/* An architecture can define it to clobber caller-saved registers in
malloc below to verify that __tls_get_addr won't change caller-saved
registers. */
#ifndef PREPARE_MALLOC
# define PREPARE_MALLOC()
#endif
extern void * __libc_malloc (size_t);
size_t malloc_counter = 0;
void *
malloc (size_t n)
{
PREPARE_MALLOC ();
malloc_counter++;
return __libc_malloc (n);
}
static void *mod;
static const char *modname = "tst-tls23-mod.so";
static void
open_mod (void)
{
mod = xdlopen (modname, RTLD_LAZY);
printf ("open %s\n", modname);
}
static void
close_mod (void)
{
xdlclose (mod);
mod = NULL;
printf ("close %s\n", modname);
}
static void
access_mod (const char *sym)
{
struct tls var = { -4, -4, -4, -4 };
struct tls *(*f) (struct tls *) = xdlsym (mod, sym);
/* Check that our malloc is called. */
malloc_counter = 0;
struct tls *p = f (&var);
TEST_VERIFY (malloc_counter != 0);
printf ("access %s: %s() = %p\n", modname, sym, p);
TEST_VERIFY_EXIT (memcmp (p, &var, sizeof (var)) == 0);
++(p->a);
}
static void *
start (void *arg)
{
access_mod ("apply_tls");
return arg;
}
static int
do_test (void)
{
if (!IS_SUPPORTED ())
return EXIT_UNSUPPORTED;
open_mod ();
pthread_t t = xpthread_create (NULL, start, NULL);
xpthread_join (t);
close_mod ();
return 0;
}
#include <support/test-driver.c>
|
