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

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Reviewed by:	kib, mhorne
MFC after:	1 month
Differential Revision:	https://reviews.freebsd.org/D46279
This commit is contained in:
Jessica Clarke 2024-08-22 20:36:45 +01:00
parent 729d2b16b7
commit 8afae0caf4
1 changed files with 49 additions and 0 deletions
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49
sys/riscv/include/ifunc.h Normal file
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/*-
* 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