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91ac3a7d | 1 | /* Test if an executable can read from the TLS from an STT_GNU_IFUNC resolver. |
2b778ceb | 2 | Copyright (C) 2017-2021 Free Software Foundation, Inc. |
91ac3a7d TMQMF |
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 | |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
91ac3a7d TMQMF |
18 | |
19 | #include <stdio.h> | |
20 | #include <stdlib.h> | |
21 | #include <stdint.h> | |
22 | #include <inttypes.h> | |
23 | #include <libc-symbols.h> | |
24 | #include <tls-macros.h> | |
25 | ||
26 | __thread int bar; | |
27 | static int *bar_ptr = NULL; | |
28 | ||
29 | static uint32_t resolver_platform = 0; | |
30 | ||
31 | int foo (void); | |
32 | ||
33 | int tcb_test (void); | |
34 | ||
35 | /* Offsets copied from tcb-offsets.h. */ | |
36 | #ifdef __powerpc64__ | |
37 | # define __TPREG "r13" | |
38 | # define __ATPLATOFF -28764 | |
39 | #else | |
40 | # define __TPREG "r2" | |
41 | # define __ATPLATOFF -28724 | |
42 | #endif | |
43 | ||
44 | uint32_t | |
45 | get_platform (void) | |
46 | { | |
47 | register unsigned long tp __asm__ (__TPREG); | |
48 | uint32_t tmp; | |
49 | ||
50 | __asm__ ("lwz %0,%1(%2)\n" | |
51 | : "=r" (tmp) | |
52 | : "i" (__ATPLATOFF), "b" (tp)); | |
53 | ||
54 | return tmp; | |
55 | } | |
56 | ||
57 | void | |
58 | init_foo (void) | |
59 | { | |
60 | bar_ptr = TLS_GD (bar); | |
61 | } | |
62 | ||
63 | int | |
64 | my_foo (void) | |
65 | { | |
66 | printf ("&bar = %p and bar_ptr = %p.\n", &bar, bar_ptr); | |
67 | return bar_ptr != NULL; | |
68 | } | |
69 | ||
70 | __ifunc (foo, foo, my_foo, void, init_foo); | |
71 | ||
72 | void | |
73 | init_tcb_test (void) | |
74 | { | |
75 | resolver_platform = get_platform (); | |
76 | } | |
77 | ||
78 | int | |
79 | my_tcb_test (void) | |
80 | { | |
81 | printf ("resolver_platform = 0x%"PRIx32 | |
82 | " and current platform = 0x%"PRIx32".\n", | |
83 | resolver_platform, get_platform ()); | |
84 | return resolver_platform != 0; | |
85 | } | |
86 | ||
87 | __ifunc (tcb_test, tcb_test, my_tcb_test, void, init_tcb_test); | |
88 | ||
89 | static int | |
90 | do_test (void) | |
91 | { | |
92 | int ret = 0; | |
93 | ||
94 | if (foo ()) | |
95 | printf ("PASS: foo IFUNC resolver called once.\n"); | |
96 | else | |
97 | { | |
98 | printf ("FAIL: foo IFUNC resolver not called once.\n"); | |
99 | ret = 1; | |
100 | } | |
101 | ||
102 | if (&bar == bar_ptr) | |
103 | printf ("PASS: bar address read from IFUNC resolver is correct.\n"); | |
104 | else | |
105 | { | |
106 | printf ("FAIL: bar address read from IFUNC resolver is incorrect.\n"); | |
107 | ret = 1; | |
108 | } | |
109 | ||
110 | if (tcb_test ()) | |
111 | printf ("PASS: tcb_test IFUNC resolver called once.\n"); | |
112 | else | |
113 | { | |
114 | printf ("FAIL: tcb_test IFUNC resolver not called once.\n"); | |
115 | ret = 1; | |
116 | } | |
117 | ||
118 | if (resolver_platform == get_platform ()) | |
119 | printf ("PASS: platform read from IFUNC resolver is correct.\n"); | |
120 | else | |
121 | { | |
122 | printf ("FAIL: platform read from IFUNC resolver is incorrect.\n"); | |
123 | ret = 1; | |
124 | } | |
125 | ||
126 | return ret; | |
127 | } | |
128 | ||
129 | #include <support/test-driver.c> |