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sys/x86/include/ifunc.h
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/*- | |||||
* Copyright (c) 2015, 2017 The FreeBSD Foundation | |||||
* All rights reserved. | |||||
* | |||||
* This software was developed by Konstantin Belousov <kib@FreeBSD.org> | |||||
* under sponsorship from the FreeBSD Foundation. | |||||
* | |||||
* Redistribution and use in source and binary forms, with or without | |||||
* modification, are permitted provided that the following conditions | |||||
* are met: | |||||
* 1. Redistributions of source code must retain the above copyright | |||||
* notice, this list of conditions and the following disclaimer. | |||||
* 2. Redistributions in binary form must reproduce the above copyright | |||||
* notice, this list of conditions and the following disclaimer in the | |||||
* documentation and/or other materials provided with the distribution. | |||||
* | |||||
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND | |||||
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |||||
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |||||
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE | |||||
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |||||
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |||||
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |||||
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |||||
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |||||
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |||||
* SUCH DAMAGE. | |||||
* | |||||
* $FreeBSD$ | |||||
*/ | |||||
#ifndef __X86_IFUNC_H | |||||
#define __X86_IFUNC_H | |||||
#define DECLARE_LIFUNC(ret_type, name, args) \ | |||||
ret_type name args | |||||
#define DEFINE_LIFUNC(scope, selector_qual, ret_type, name, args) \ | |||||
__asm__ (scope "\t" #name "\n" \ | |||||
"\t.type\t" #name ",@function\n" \ | |||||
#name ":\n" \ | |||||
"\tjmp *" #name "_selector\n" \ | |||||
"\t.size\t" #name ",\t. - "#name); \ | |||||
selector_qual ret_type (*name##_selector)args __used; \ | |||||
DECLARE_LIFUNC(ret_type, name, args) | |||||
#define DEFINE_STATIC_LIFUNC(ret_type, name, args) \ | |||||
DEFINE_LIFUNC(".local", static, ret_type, name, args) | |||||
#define DEFINE_GLOBAL_LIFUNC(ret_type, name, args) \ | |||||
DEFINE_LIFUNC(".globl", , ret_type, name, args) | |||||
#define DEFINE_IFUNC(qual, ret_type, name, args, resolver_qual) \ | |||||
resolver_qual ret_type (*name##_resolver(void))args __used; \ | |||||
qual ret_type name args __attribute__((ifunc(#name "_resolver"))); \ | |||||
resolver_qual ret_type (*name##_resolver(void))args | |||||
#endif |