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_ */ 65