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 28 #ifndef _SYS_LINKER_SET_H_ 29 #define _SYS_LINKER_SET_H_ 30 31 #include <sys/ccompile.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 #define __MAKE_SET_CONST const 40 41 #define __CONCAT1(x, y) x ## y 42 #define __CONCAT(x, y) __CONCAT1(x, y) 43 44 #define __STRING(x) #x /* stringify without expanding x */ 45 #define __XSTRING(x) __STRING(x) /* expand x, then stringify */ 46 47 #define __GLOBL(sym) __asm__(".globl " __XSTRING(sym)) 48 #define __WEAK(sym) __asm__(".weak " __XSTRING(sym)) 49 /* 50 * Private macros, not to be used outside this header file. 51 */ 52 #define __MAKE_SET(set, sym) \ 53 __WEAK(__CONCAT(__start_set_, set)); \ 54 __WEAK(__CONCAT(__stop_set_, set)); \ 55 static void const * __MAKE_SET_CONST \ 56 __set_##set##_sym_##sym __section("set_" #set) \ 57 __used = &(sym) 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 __weak_symbol *__CONCAT(__start_set_, set); \ 73 extern ptype __weak_symbol *__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