sys/compat/linux/linux_vdso.h

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