/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Copyright (c) 2013-2021 Dmitry Chagin <dchagin@FreeBSD.org>
 *
 * 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 _LINUX_VDSO_H_
#define	_LINUX_VDSO_H_

struct linux_vdso_sym {
	SLIST_ENTRY(linux_vdso_sym) sym;
	uint32_t	size;
	uintptr_t *	ptr;
	char		symname[];
};

vm_object_t __elfN(linux_shared_page_init)(char **, vm_size_t);
void	__elfN(linux_shared_page_fini)(vm_object_t, void *, vm_size_t);
void	__elfN(linux_vdso_fixup)(char *, vm_offset_t);
void	__elfN(linux_vdso_sym_init)(struct linux_vdso_sym *);

int	linux_map_vdso(struct proc *, vm_object_t, vm_offset_t,
	    vm_offset_t, struct image_params *);

#define	LINUX_VDSO_SYM_INTPTR(name)				\
uintptr_t name;							\
LINUX_VDSO_SYM_DEFINE(name)

#define	LINUX_VDSO_SYM_CHAR(name)				\
const char * name;						\
LINUX_VDSO_SYM_DEFINE(name)

#define	LINUX_VDSO_SYM_DEFINE(name)				\
static struct linux_vdso_sym name ## sym = {			\
	.symname	= #name,				\
	.size		= sizeof(#name),			\
	.ptr		= (uintptr_t *)&name			\
};								\
SYSINIT(__elfN(name ## _sym_init), SI_SUB_EXEC,			\
    SI_ORDER_FIRST, __elfN(linux_vdso_sym_init), &name ## sym);	\
struct __hack

#endif	/* _LINUX_VDSO_H_ */