1 /*- 2 * Copyright (c) 1999 John D. Polstra 3 * Copyright (c) 1999,2001 Peter Wemm <peter@FreeBSD.org> 4 * All rights reserved. 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 * $FreeBSD$ 28 */ 29 30 #ifndef _SYS_LINKER_SET_H_ 31 #define _SYS_LINKER_SET_H_ 32 33 #ifndef _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 __GLOBL(__CONCAT(__start_set_,set)); \ 49 __GLOBL(__CONCAT(__stop_set_,set)); \ 50 static void const * const __set_##set##_sym_##sym \ 51 __section("set_" #set) __used = &sym 52 #else /* !__GNUCLIKE___SECTION */ 53 #ifndef lint 54 #error this file needs to be ported to your compiler 55 #endif /* lint */ 56 #define __MAKE_SET(set, sym) extern void const * const (__set_##set##_sym_##sym) 57 #endif /* __GNUCLIKE___SECTION */ 58 59 /* 60 * Public macros. 61 */ 62 #define TEXT_SET(set, sym) __MAKE_SET(set, sym) 63 #define DATA_SET(set, sym) __MAKE_SET(set, sym) 64 #define BSS_SET(set, sym) __MAKE_SET(set, sym) 65 #define ABS_SET(set, sym) __MAKE_SET(set, sym) 66 #define SET_ENTRY(set, sym) __MAKE_SET(set, sym) 67 68 /* 69 * Initialize before referring to a given linker set. 70 */ 71 #define SET_DECLARE(set, ptype) \ 72 extern ptype *__CONCAT(__start_set_,set); \ 73 extern ptype *__CONCAT(__stop_set_,set) 74 75 #define SET_BEGIN(set) \ 76 (&__CONCAT(__start_set_,set)) 77 #define SET_LIMIT(set) \ 78 (&__CONCAT(__stop_set_,set)) 79 80 /* 81 * Iterate over all the elements of a set. 82 * 83 * Sets always contain addresses of things, and "pvar" points to words 84 * containing those addresses. Thus is must be declared as "type **pvar", 85 * and the address of each set item is obtained inside the loop by "*pvar". 86 */ 87 #define SET_FOREACH(pvar, set) \ 88 for (pvar = SET_BEGIN(set); pvar < SET_LIMIT(set); pvar++) 89 90 #define SET_ITEM(set, i) \ 91 ((SET_BEGIN(set))[i]) 92 93 /* 94 * Provide a count of the items in a set. 95 */ 96 #define SET_COUNT(set) \ 97 (SET_LIMIT(set) - SET_BEGIN(set)) 98 99 #endif /* _SYS_LINKER_SET_H_ */ 100