190ce8b93SToomas Soome /* 290ce8b93SToomas Soome * Copyright (c) 1999 John D. Polstra 390ce8b93SToomas Soome * Copyright (c) 1999,2001 Peter Wemm <peter@FreeBSD.org> 490ce8b93SToomas Soome * All rights reserved. 590ce8b93SToomas Soome * 690ce8b93SToomas Soome * Redistribution and use in source and binary forms, with or without 790ce8b93SToomas Soome * modification, are permitted provided that the following conditions 890ce8b93SToomas Soome * are met: 990ce8b93SToomas Soome * 1. Redistributions of source code must retain the above copyright 1090ce8b93SToomas Soome * notice, this list of conditions and the following disclaimer. 1190ce8b93SToomas Soome * 2. Redistributions in binary form must reproduce the above copyright 1290ce8b93SToomas Soome * notice, this list of conditions and the following disclaimer in the 1390ce8b93SToomas Soome * documentation and/or other materials provided with the distribution. 1490ce8b93SToomas Soome * 1590ce8b93SToomas Soome * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 1690ce8b93SToomas Soome * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 1790ce8b93SToomas Soome * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 1890ce8b93SToomas Soome * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 1990ce8b93SToomas Soome * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2090ce8b93SToomas Soome * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2190ce8b93SToomas Soome * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2290ce8b93SToomas Soome * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2390ce8b93SToomas Soome * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2490ce8b93SToomas Soome * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 2590ce8b93SToomas Soome * SUCH DAMAGE. 2690ce8b93SToomas Soome */ 2790ce8b93SToomas Soome 2890ce8b93SToomas Soome #ifndef _SYS_LINKER_SET_H_ 2990ce8b93SToomas Soome #define _SYS_LINKER_SET_H_ 3090ce8b93SToomas Soome 3190ce8b93SToomas Soome #include <sys/ccompile.h> 3290ce8b93SToomas Soome 3390ce8b93SToomas Soome /* 3490ce8b93SToomas Soome * The following macros are used to declare global sets of objects, which 3590ce8b93SToomas Soome * are collected by the linker into a `linker_set' as defined below. 3690ce8b93SToomas Soome * For ELF, this is done by constructing a separate segment for each set. 3790ce8b93SToomas Soome */ 3890ce8b93SToomas Soome 3990ce8b93SToomas Soome #define __MAKE_SET_CONST const 4090ce8b93SToomas Soome 4190ce8b93SToomas Soome #define __CONCAT1(x, y) x ## y 4290ce8b93SToomas Soome #define __CONCAT(x, y) __CONCAT1(x, y) 4390ce8b93SToomas Soome 44*d56b5f9fSToomas Soome #define __STRING(x) #x /* stringify without expanding x */ 45*d56b5f9fSToomas Soome #define __XSTRING(x) __STRING(x) /* expand x, then stringify */ 46*d56b5f9fSToomas Soome 47*d56b5f9fSToomas Soome #define __GLOBL(sym) __asm__(".globl " __XSTRING(sym)) 48*d56b5f9fSToomas Soome #define __WEAK(sym) __asm__(".weak " __XSTRING(sym)) 4990ce8b93SToomas Soome /* 5090ce8b93SToomas Soome * Private macros, not to be used outside this header file. 5190ce8b93SToomas Soome */ 5290ce8b93SToomas Soome #define __MAKE_SET(set, sym) \ 53*d56b5f9fSToomas Soome __WEAK(__CONCAT(__start_set_, set)); \ 54*d56b5f9fSToomas Soome __WEAK(__CONCAT(__stop_set_, set)); \ 5590ce8b93SToomas Soome static void const * __MAKE_SET_CONST \ 5690ce8b93SToomas Soome __set_##set##_sym_##sym __section("set_" #set) \ 5790ce8b93SToomas Soome __used = &(sym) 5890ce8b93SToomas Soome 5990ce8b93SToomas Soome /* 6090ce8b93SToomas Soome * Public macros. 6190ce8b93SToomas Soome */ 6290ce8b93SToomas Soome #define TEXT_SET(set, sym) __MAKE_SET(set, sym) 6390ce8b93SToomas Soome #define DATA_SET(set, sym) __MAKE_SET(set, sym) 6490ce8b93SToomas Soome #define BSS_SET(set, sym) __MAKE_SET(set, sym) 6590ce8b93SToomas Soome #define ABS_SET(set, sym) __MAKE_SET(set, sym) 6690ce8b93SToomas Soome #define SET_ENTRY(set, sym) __MAKE_SET(set, sym) 6790ce8b93SToomas Soome 6890ce8b93SToomas Soome /* 6990ce8b93SToomas Soome * Initialize before referring to a given linker set. 7090ce8b93SToomas Soome */ 7190ce8b93SToomas Soome #define SET_DECLARE(set, ptype) \ 7290ce8b93SToomas Soome extern ptype __weak_symbol *__CONCAT(__start_set_, set); \ 7390ce8b93SToomas Soome extern ptype __weak_symbol *__CONCAT(__stop_set_, set) 7490ce8b93SToomas Soome 7590ce8b93SToomas Soome #define SET_BEGIN(set) \ 7690ce8b93SToomas Soome (&__CONCAT(__start_set_, set)) 7790ce8b93SToomas Soome #define SET_LIMIT(set) \ 7890ce8b93SToomas Soome (&__CONCAT(__stop_set_, set)) 7990ce8b93SToomas Soome 8090ce8b93SToomas Soome /* 8190ce8b93SToomas Soome * Iterate over all the elements of a set. 8290ce8b93SToomas Soome * 8390ce8b93SToomas Soome * Sets always contain addresses of things, and "pvar" points to words 8490ce8b93SToomas Soome * containing those addresses. Thus is must be declared as "type **pvar", 8590ce8b93SToomas Soome * and the address of each set item is obtained inside the loop by "*pvar". 8690ce8b93SToomas Soome */ 8790ce8b93SToomas Soome #define SET_FOREACH(pvar, set) \ 8890ce8b93SToomas Soome for (pvar = SET_BEGIN(set); pvar < SET_LIMIT(set); pvar++) 8990ce8b93SToomas Soome 9090ce8b93SToomas Soome #define SET_ITEM(set, i) \ 9190ce8b93SToomas Soome ((SET_BEGIN(set))[i]) 9290ce8b93SToomas Soome 9390ce8b93SToomas Soome /* 9490ce8b93SToomas Soome * Provide a count of the items in a set. 9590ce8b93SToomas Soome */ 9690ce8b93SToomas Soome #define SET_COUNT(set) \ 9790ce8b93SToomas Soome (SET_LIMIT(set) - SET_BEGIN(set)) 9890ce8b93SToomas Soome 9990ce8b93SToomas Soome #endif /* _SYS_LINKER_SET_H_ */ 100