1 /*- 2 * Copyright (c) 2015, 2017 The FreeBSD Foundation 3 * All rights reserved. 4 * 5 * This software was developed by Konstantin Belousov <kib@FreeBSD.org> 6 * under sponsorship from the FreeBSD Foundation. 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 AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * $FreeBSD$ 30 */ 31 32 #ifndef __X86_IFUNC_H 33 #define __X86_IFUNC_H 34 35 #define DECLARE_LIFUNC(ret_type, name, args) \ 36 ret_type name args 37 38 #define DEFINE_LIFUNC(scope, selector_qual, ret_type, name, args) \ 39 __asm__ (scope "\t" #name "\n" \ 40 "\t.type\t" #name ",@function\n" \ 41 #name ":\n" \ 42 "\tjmp *" #name "_selector\n" \ 43 "\t.size\t" #name ",\t. - "#name); \ 44 selector_qual ret_type (*name##_selector)args __used; \ 45 DECLARE_LIFUNC(ret_type, name, args) 46 47 #define DEFINE_STATIC_LIFUNC(ret_type, name, args) \ 48 DEFINE_LIFUNC(".local", static, ret_type, name, args) 49 50 #define DEFINE_GLOBAL_LIFUNC(ret_type, name, args) \ 51 DEFINE_LIFUNC(".globl", , ret_type, name, args) 52 53 #define DEFINE_IFUNC(qual, ret_type, name, args, resolver_qual) \ 54 resolver_qual ret_type (*name##_resolver(void))args __used; \ 55 qual ret_type name args __attribute__((ifunc(#name "_resolver"))); \ 56 resolver_qual ret_type (*name##_resolver(void))args 57 58 #endif 59