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 #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_ */ 67