sys/compat/linux/linux_vdso.h

   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
  31 struct linux_vdso_sym {
  32         SLIST_ENTRY(linux_vdso_sym) sym;
  33         uint32_t        size;
  34         uintptr_t *     ptr;
  35         char            symname[];
  36 };
  37
  38 vm_object_t __elfN(linux_shared_page_init)(char **, vm_size_t);
  39 void    __elfN(linux_shared_page_fini)(vm_object_t, void *, vm_size_t);
  40 void    __elfN(linux_vdso_fixup)(char *, vm_offset_t);
  41 void    __elfN(linux_vdso_sym_init)(struct linux_vdso_sym *);
  42
  43 int     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)                             \
  47 uintptr_t name;                                                 \
  48 LINUX_VDSO_SYM_DEFINE(name)
  49
  50 #define LINUX_VDSO_SYM_CHAR(name)                               \
  51 const char * name;                                              \
  52 LINUX_VDSO_SYM_DEFINE(name)
  53
  54 #define LINUX_VDSO_SYM_DEFINE(name)                             \
  55 static struct linux_vdso_sym name ## sym = {                    \
  56         .symname        = #name,                                \
  57         .size           = sizeof(#name),                        \
  58         .ptr            = (uintptr_t *)&name                    \
  59 };                                                              \
  60 SYSINIT(__elfN(name ## _sym_init), SI_SUB_EXEC,                 \
  61     SI_ORDER_FIRST, __elfN(linux_vdso_sym_init), &name ## sym); \
  62 struct __hack
  63
  64 #endif  /* _LINUX_VDSO_H_ */