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 43 ifunc1(void) 44 { 45 return 0xdeadbeefll; 46 } 47 48 static long long 49 ifunc2(void) 50 { 51 return 0xbeefdeadll; 52 } 53 54 static __attribute__((used)) 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 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 74 main(int argc, char **argv) 75 { 76 return 127; 77 } 78 #endif 79