h_helper_ifunc.c revision 1.10 
1/*-
2 * Copyright (c) 2014 The NetBSD Foundation, Inc.
3 * All rights reserved.
4 *
5 * This code is derived from software contributed to The NetBSD Foundation
6 * by Joerg Sonnenberger.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
18 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
19 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
20 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
21 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
22 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
23 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
24 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
25 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
26 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
27 * POSSIBILITY OF SUCH DAMAGE.
28 */
29
30#include <stdlib.h>
31#include <string.h>
32
33/*
34 * Not supported on hppa
35 */
36#if !defined(__hppa__)
37
38static long long
39ifunc1(void)
40{
41	return 0xdeadbeefll;
42}
43
44static long long
45ifunc2(void)
46{
47	return 0xbeefdeadll;
48}
49
50static __attribute__((used))
51long long (*resolve_ifunc(void))(void)
52{
53	const char *e = getenv("USE_IFUNC2");
54	return e && strcmp(e, "1") == 0 ? ifunc2 : ifunc1;
55}
56
57static __attribute__((used))
58long long (*resolve_ifunc2(void))(void)
59{
60	const char *e = getenv("USE_IFUNC2");
61	return e && strcmp(e, "1") == 0 ? ifunc1 : ifunc2;
62}
63
64__ifunc(ifunc, resolve_ifunc);
65__hidden_ifunc(ifunc_hidden, resolve_ifunc2);
66
67long long ifunc_hidden(void);
68long long ifunc_plt(void);
69
70long long ifunc_plt(void)
71{
72	return ifunc_hidden();
73}
74
75long long (*ifunc_indirect(void))(void);
76
77long long (*ifunc_indirect(void))(void)
78{
79	return ifunc_hidden;
80}
81#endif
82