git: 8afae0caf4c4 - main - riscv: Add machine/ifunc.h corresponding to rtld-elf's resolver interface

The branch main has been updated by jrtc27:

URL: https://cgit.FreeBSD.org/src/commit/?id=8afae0caf4c4816eb56b732fcd1a4b185e86098a

commit 8afae0caf4c4816eb56b732fcd1a4b185e86098a
Author:     Jessica Clarke <jrtc27@FreeBSD.org>
AuthorDate: 2024-08-22 19:36:45 +0000
Commit:     Jessica Clarke <jrtc27@FreeBSD.org>
CommitDate: 2024-08-22 19:36:45 +0000

    riscv: Add machine/ifunc.h corresponding to rtld-elf's resolver interface
    
    Reviewed by:    kib, mhorne
    MFC after:      1 month
    Differential Revision:  https://reviews.freebsd.org/D46279
---
 sys/riscv/include/ifunc.h | 49 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 49 insertions(+)

diff --git a/sys/riscv/include/ifunc.h b/sys/riscv/include/ifunc.h
new file mode 100644
index 000000000000..0f9747a2aa14
--- /dev/null
+++ b/sys/riscv/include/ifunc.h
@@ -0,0 +1,49 @@
+/*-
+ * Copyright (c) 2015-2018 The FreeBSD Foundation
+ * Copyright (c) 2024 Jessica Clarke <jrtc27@FreeBSD.org>
+ *
+ * Part of 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.
+ */
+
+#ifndef __RISCV_IFUNC_H
+#define	__RISCV_IFUNC_H
+
+#define	DEFINE_IFUNC(qual, ret_type, name, args)			\
+    static ret_type (*name##_resolver(void))args __used;		\
+    qual ret_type name args __attribute__((ifunc(#name "_resolver")));	\
+    static ret_type (*name##_resolver(void))args
+
+#define	DEFINE_UIFUNC(qual, ret_type, name, args)			\
+    static ret_type (*name##_resolver(unsigned long, unsigned long,	\
+	unsigned long, unsigned long, unsigned long, unsigned long,	\
+	unsigned long, unsigned long))args __used;			\
+    qual ret_type name args __attribute__((ifunc(#name "_resolver")));	\
+    static ret_type (*name##_resolver(unsigned long elf_hwcap __unused,	\
+	unsigned long _arg2 __unused, unsigned long _arg3 __unused,	\
+	unsigned long _arg4 __unused, unsigned long _arg5 __unused,	\
+	unsigned long _arg6 __unused, unsigned long _arg7 __unused,	\
+	unsigned long _arg8 __unused))args
+
+#endif