1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 1999 John D. Polstra 5 * Copyright (c) 1999,2001 Peter Wemm <peter@FreeBSD.org> 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #ifndef _SYS_LINKER_SET_H_ 31 #define _SYS_LINKER_SET_H_ 32 33 /* 34 * The following macros are used to declare global sets of objects, which 35 * are collected by the linker into a `linker_set' as defined below. 36 * For ELF, this is done by constructing a separate segment for each set. 37 */ 38 39 #if defined(__powerpc64__) && (!defined(_CALL_ELF) || _CALL_ELF == 1) 40 /* 41 * ELFv1 pointers to functions are actaully pointers to function 42 * descriptors. 43 * 44 * Move the symbol pointer from ".text" to ".data" segment, to make 45 * the GCC compiler happy: 46 */ 47 #define __MAKE_SET_CONST 48 #else 49 #define __MAKE_SET_CONST const 50 #endif 51 52 /* 53 * Private macros, not to be used outside this header file. 54 */ 55 56 /* 57 * The userspace address sanitizer inserts redzones around global variables, 58 * violating the assumption that linker set elements are packed. 59 */ 60 #ifdef _KERNEL 61 #define __NOASAN 62 #else 63 #define __NOASAN __nosanitizeaddress 64 #endif 65 66 #define __MAKE_SET_QV(set, sym, qv) \ 67 __WEAK(__CONCAT(__start_set_,set)); \ 68 __WEAK(__CONCAT(__stop_set_,set)); \ 69 static void const * qv \ 70 __NOASAN \ 71 __set_##set##_sym_##sym __section("set_" #set) \ 72 __used = &(sym) 73 #define __MAKE_SET(set, sym) __MAKE_SET_QV(set, sym, __MAKE_SET_CONST) 74 75 /* 76 * Public macros. 77 */ 78 #define TEXT_SET(set, sym) __MAKE_SET(set, sym) 79 #define DATA_SET(set, sym) __MAKE_SET(set, sym) 80 #define DATA_WSET(set, sym) __MAKE_SET_QV(set, sym, ) 81 #define BSS_SET(set, sym) __MAKE_SET(set, sym) 82 #define ABS_SET(set, sym) __MAKE_SET(set, sym) 83 #define SET_ENTRY(set, sym) __MAKE_SET(set, sym) 84 85 /* 86 * Initialize before referring to a given linker set. 87 */ 88 #define SET_DECLARE(set, ptype) \ 89 extern ptype __weak_symbol *__CONCAT(__start_set_,set); \ 90 extern ptype __weak_symbol *__CONCAT(__stop_set_,set) 91 92 #define SET_BEGIN(set) \ 93 (&__CONCAT(__start_set_,set)) 94 #define SET_LIMIT(set) \ 95 (&__CONCAT(__stop_set_,set)) 96 97 /* 98 * Iterate over all the elements of a set. 99 * 100 * Sets always contain addresses of things, and "pvar" points to words 101 * containing those addresses. Thus is must be declared as "type **pvar", 102 * and the address of each set item is obtained inside the loop by "*pvar". 103 */ 104 #define SET_FOREACH(pvar, set) \ 105 for (pvar = SET_BEGIN(set); pvar < SET_LIMIT(set); pvar++) 106 107 #define SET_ITEM(set, i) \ 108 ((SET_BEGIN(set))[i]) 109 110 /* 111 * Provide a count of the items in a set. 112 */ 113 #define SET_COUNT(set) \ 114 (SET_LIMIT(set) - SET_BEGIN(set)) 115 116 #endif /* _SYS_LINKER_SET_H_ */ 117