linux_vdso.h

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    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_ */

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FreeBSD/Linux Kernel Cross Reference sys/compat/linux/linux_vdso.h

FreeBSD/Linux Kernel Cross Reference
sys/compat/linux/linux_vdso.h