svn commit: r333229 - head/sys/x86/include
Konstantin Belousov
kib at FreeBSD.org
Thu May 3 21:46:00 UTC 2018
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 at 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 ", at 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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