1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 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 #ifndef _FBSD_COMPAT_SYS_LINKER_SET_H_ 30 #define _FBSD_COMPAT_SYS_LINKER_SET_H_ 31 32 33 #ifndef _FBSD_COMPAT_SYS_CDEFS_H_ 34 #error this file needs sys/cdefs.h as a prerequisite 35 #endif 36 37 /* 38 * The following macros are used to declare global sets of objects, which 39 * are collected by the linker into a `linker_set' as defined below. 40 * For ELF, this is done by constructing a separate segment for each set. 41 */ 42 43 /* 44 * Private macros, not to be used outside this header file. 45 */ 46 #ifdef __GNUCLIKE___SECTION 47 #define __MAKE_SET(set, sym) \ 48 static void const * const __set_##set##_sym_##sym \ 49 __section("set_" #set) __used = &sym 50 #else /* !__GNUCLIKE___SECTION */ 51 #ifndef lint 52 #error this file needs to be ported to your compiler 53 #endif /* lint */ 54 #define __MAKE_SET(set, sym) extern void const * const (__set_##set##_sym_##sym) 55 #endif /* __GNUCLIKE___SECTION */ 56 57 /* 58 * Public macros. 59 */ 60 #define TEXT_SET(set, sym) __MAKE_SET(set, sym) 61 #define DATA_SET(set, sym) __MAKE_SET(set, sym) 62 #define BSS_SET(set, sym) __MAKE_SET(set, sym) 63 #define ABS_SET(set, sym) __MAKE_SET(set, sym) 64 #define SET_ENTRY(set, sym) __MAKE_SET(set, sym) 65 66 /* 67 * Initialize before referring to a given linker set. 68 */ 69 #define SET_DECLARE(set, ptype) \ 70 extern ptype *__CONCAT(__start_set_,set); \ 71 extern ptype *__CONCAT(__stop_set_,set) 72 73 #define SET_BEGIN(set) \ 74 (&__CONCAT(__start_set_,set)) 75 #define SET_LIMIT(set) \ 76 (&__CONCAT(__stop_set_,set)) 77 78 /* 79 * Iterate over all the elements of a set. 80 * 81 * Sets always contain addresses of things, and "pvar" points to words 82 * containing those addresses. Thus is must be declared as "type **pvar", 83 * and the address of each set item is obtained inside the loop by "*pvar". 84 */ 85 #define SET_FOREACH(pvar, set) \ 86 for (pvar = SET_BEGIN(set); pvar < SET_LIMIT(set); pvar++) 87 88 #endif /* _FBSD_COMPAT_SYS_LINKER_SET_H_ */ 89