1/*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2013-2021 Dmitry Chagin <dchagin@FreeBSD.org>
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 */
27
28#ifndef _LINUX_VDSO_H_
29#define	_LINUX_VDSO_H_
30
31struct linux_vdso_sym {
32	SLIST_ENTRY(linux_vdso_sym) sym;
33	uint32_t	size;
34	uintptr_t *	ptr;
35	char		symname[];
36};
37
38vm_object_t __elfN(linux_shared_page_init)(char **, vm_size_t);
39void	__elfN(linux_shared_page_fini)(vm_object_t, void *, vm_size_t);
40void	__elfN(linux_vdso_fixup)(char *, vm_offset_t);
41void	__elfN(linux_vdso_sym_init)(struct linux_vdso_sym *);
42
43int	linux_map_vdso(struct proc *, vm_object_t, vm_offset_t,
44	    vm_offset_t, struct image_params *);
45
46#define	LINUX_VDSO_SYM_INTPTR(name)				\
47uintptr_t name;							\
48LINUX_VDSO_SYM_DEFINE(name)
49
50#define	LINUX_VDSO_SYM_CHAR(name)				\
51const char * name;						\
52LINUX_VDSO_SYM_DEFINE(name)
53
54#define	LINUX_VDSO_SYM_DEFINE(name)				\
55static struct linux_vdso_sym name ## sym = {			\
56	.symname	= #name,				\
57	.size		= sizeof(#name),			\
58	.ptr		= (uintptr_t *)&name			\
59};								\
60SYSINIT(__elfN(name ## _sym_init), SI_SUB_EXEC,			\
61    SI_ORDER_FIRST, __elfN(linux_vdso_sym_init), &name ## sym);	\
62struct __hack
63
64#endif	/* _LINUX_VDSO_H_ */
65