Date: Thu, 3 May 2018 21:45:59 +0000 (UTC) From: Konstantin Belousov <kib@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r333229 - head/sys/x86/include Message-ID: <201805032145.w43Ljx8w036130@repo.freebsd.org>
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Author: kib Date: Thu May 3 21:45:59 2018 New Revision: 333229 URL: https://svnweb.freebsd.org/changeset/base/333229 Log: Add helper macros to hide some boring repeatable ceremonies to define ifuncs on x86. Also keep helpers to define 'pseudo-ifuncs' which are emulated by the indirect jmp. Reviewed by: jhb (previous version, as part of the larger patch) Sponsored by: The FreeBSD Foundation MFC after: 2 weeks Differential revision: https://reviews.freebsd.org/D13838 Added: head/sys/x86/include/ifunc.h (contents, props changed) Added: head/sys/x86/include/ifunc.h ============================================================================== --- /dev/null 00:00:00 1970 (empty, because file is newly added) +++ head/sys/x86/include/ifunc.h Thu May 3 21:45:59 2018 (r333229) @@ -0,0 +1,58 @@ +/*- + * 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
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