1 /* $NetBSD: h_ifunc_static.c,v 1.7 2022/06/21 06:52:17 skrll Exp $ */
2
3 /*-
4 * Copyright (c) 2018 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Joerg Sonnenberger.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 #if \
33 defined(__aarch64__) || \
34 defined(__arm__) || \
35 defined(__i386__) || \
36 defined(__powerpc__) || \
37 defined(__sparc__) || \
38 defined(__x86_64__)
39 #include <stdlib.h>
40 #include <string.h>
41
42 static long long
ifunc1(void)43 ifunc1(void)
44 {
45 return 0xdeadbeefll;
46 }
47
48 static long long
ifunc2(void)49 ifunc2(void)
50 {
51 return 0xbeefdeadll;
52 }
53
54 static __attribute__((used))
resolve_ifunc(void)55 long long (*resolve_ifunc(void))(void)
56 {
57 const char *e = getenv("USE_IFUNC2");
58 return e && strcmp(e, "1") == 0 ? ifunc2 : ifunc1;
59 }
60
61 __ifunc(ifunc, resolve_ifunc);
62 extern long long ifunc(void);
63
64 int
main(int argc,char ** argv)65 main(int argc, char **argv)
66 {
67
68 if (argc != 2)
69 return 1;
70 return atoll(argv[1]) != ifunc();
71 }
72 #else
73 int
main(int argc,char ** argv)74 main(int argc, char **argv)
75 {
76 return 127;
77 }
78 #endif
79