1 /* 2 * Copyright (C) 2019 The Android Open Source Project 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * * Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * * Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in 12 * the documentation and/or other materials provided with the 13 * distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #pragma once 30 31 #include <stdint.h> 32 #include <sys/ifunc.h> 33 34 #if defined(__aarch64__) 35 #define IFUNC_ARGS (uint64_t hwcap __attribute__((unused)), \ 36 __ifunc_arg_t* arg __attribute__((unused))) 37 #elif defined(__arm__) 38 #define IFUNC_ARGS (unsigned long hwcap __attribute__((unused))) 39 #else 40 #define IFUNC_ARGS () 41 #endif 42 43 // We can't have HWASAN enabled in resolvers because they may be called before HWASAN is 44 // initialized. 45 #define DEFINE_IFUNC_FOR(name) \ 46 name##_func name __attribute__((ifunc(#name "_resolver"))); \ 47 __attribute__((visibility("hidden"))) \ 48 __attribute__((no_sanitize("hwaddress"))) \ 49 name##_func* name##_resolver IFUNC_ARGS 50 51 #define DECLARE_FUNC(type, name) \ 52 __attribute__((visibility("hidden"))) \ 53 type name 54 55 #define RETURN_FUNC(type, name) { \ 56 DECLARE_FUNC(type, name); \ 57 return name; \ 58 } 59