1 /* $NetBSD: h_ifunc_static.c,v 1.2 2018/03/11 21:20:22 joerg 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 defined(__arm__) || defined(__i386__) || defined(__x86_64__) || defined(__powerpc__) || defined(__sparc__) 33 #include <stdlib.h> 34 #include <string.h> 35 36 static long long 37 ifunc1(void) 38 { 39 return 0xdeadbeefll; 40 } 41 42 static long long 43 ifunc2(void) 44 { 45 return 0xbeefdeadll; 46 } 47 48 static __attribute__((used)) 49 long long (*resolve_ifunc(void))(void) 50 { 51 const char *e = getenv("USE_IFUNC2"); 52 return e && strcmp(e, "1") == 0 ? ifunc2 : ifunc1; 53 } 54 55 __ifunc(ifunc, resolve_ifunc); 56 extern long long ifunc(void); 57 58 int 59 main(int argc, char **argv) 60 { 61 62 if (argc != 2) 63 return 1; 64 return atoll(argv[1]) != ifunc(); 65 } 66 #else 67 int 68 main(int argc, char **argv) 69 { 70 return 127; 71 } 72 #endif 73