1 /*- 2 * Copyright (c) 1999 John D. Polstra 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * $FreeBSD: src/sys/sys/linker_set.h,v 1.4.2.1 2000/08/02 21:52:20 peter Exp $ 27 * $DragonFly: src/sys/sys/linker_set.h,v 1.4 2004/08/27 12:08:41 joerg Exp $ 28 */ 29 30 #ifndef _SYS_LINKER_SET_H_ 31 #define _SYS_LINKER_SET_H_ 32 33 #ifndef _SYS_CDEFS_H_ 34 #include <sys/cdefs.h> 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 `struct linker_set' as defined below. 40 * For ELF, this is done by constructing a separate segment for each set. 41 * 42 * In the __MAKE_SET macros below, the lines: 43 * 44 * static void const * const __set_##set##_sym_##sym = &sym; 45 * 46 * are present only to prevent the compiler from producing bogus 47 * warnings about unused symbols. 48 */ 49 #ifndef __ELF__ 50 #error only ELF is supported 51 #endif 52 53 #if 0 54 55 #define __MAKE_SET(set, sym) \ 56 static void const * const __set_##set##_sym_##sym = &sym; \ 57 __asm(".section set_" #set ",\"aw\""); \ 58 __asm(".long " #sym); \ 59 __asm(".previous") 60 61 #endif 62 63 #define __MAKE_SET(set, sym) \ 64 __GLOBL(__CONCAT(__start_set_,set)); \ 65 __GLOBL(__CONCAT(__stop_set_,set)); \ 66 static void const * const __set_##set##_sym_##sym \ 67 __section("set_" #set) __used = &sym 68 69 #define TEXT_SET(set, sym) __MAKE_SET(set, sym) 70 #define DATA_SET(set, sym) __MAKE_SET(set, sym) 71 #define BSS_SET(set, sym) __MAKE_SET(set, sym) 72 #define ABS_SET(set, sym) __MAKE_SET(set, sym) 73 #define SET_ENTRY(set, sym) __MAKE_SET(set, sym) 74 75 #define SET_DECLARE(set, ptype) \ 76 extern ptype *__CONCAT(__start_set_,set); \ 77 extern ptype *__CONCAT(__stop_set_,set) 78 79 #define SET_BEGIN(set) (&__CONCAT(__start_set_,set)) 80 #define SET_LIMIT(set) (&__CONCAT(__stop_set_,set)) 81 82 /* 83 * Iterate over all the elements of a set. 84 * 85 * Sets always contain addresses of things, and "pvar" points to words 86 * containing those addresses. Thus is must be declared as "type **pvar", 87 * and the address of each set item is obtained inside the loop by "*pvar". 88 */ 89 #define SET_FOREACH(pvar, set) \ 90 for (pvar = SET_BEGIN(set); pvar < SET_LIMIT(set); pvar++) 91 92 #define SET_ITEM(set, i) \ 93 ((SET_BEGIN(set))[i]) 94 95 /* 96 * Provide a count of the items in a set. 97 */ 98 #define SET_COUNT(set) \ 99 (SET_LIMIT(set) - SET_BEGIN(set)) 100 101 #endif /* _SYS_LINKER_SET_H_ */ 102