svn commit: r333741 - stable/11/sys/x86/include

[Konstantin Belousov]

Author: kib
Date: Thu May 17 17:40:06 2018
New Revision: 333741
URL: https://svnweb.freebsd.org/changeset/base/333741

Log:
  MFC r333229:
  Add helper macros to hide some boring repeatable ceremonies to define
  ifuncs on x86.
  
  Approved by:	re (marius)

Added:
  stable/11/sys/x86/include/ifunc.h
     - copied unchanged from r333229, head/sys/x86/include/ifunc.h
Modified:
Directory Properties:
  stable/11/   (props changed)

Copied: stable/11/sys/x86/include/ifunc.h (from r333229, head/sys/x86/include/ifunc.h)
==============================================================================
--- /dev/null	00:00:00 1970	(empty, because file is newly added)
+++ stable/11/sys/x86/include/ifunc.h	Thu May 17 17:40:06 2018	(r333741, copy of r333229, head/sys/x86/include/ifunc.h)
@@ -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