ifunc.h

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    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: releng/11.2/sys/x86/include/ifunc.h 333741 2018-05-17 17:40:06Z kib $
   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

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FreeBSD/Linux Kernel Cross Reference sys/x86/include/ifunc.h

FreeBSD/Linux Kernel Cross Reference
sys/x86/include/ifunc.h