| /*- |
| * Copyright (c) 1999 John D. Polstra |
| * Copyright (c) 1999,2001 Peter Wemm <peter@FreeBSD.org> |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
| * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
| * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| * SUCH DAMAGE. |
| * |
| * $FreeBSD$ |
| */ |
| |
| #ifndef _BSD_SYS_LINKER_SET_H_ |
| #define _BSD_SYS_LINKER_SET_H_ |
| |
| #ifndef _BSD_SYS_CDEFS_H_ |
| #error this file needs sys/bsd_cdefs.h as a prerequisite |
| #endif |
| |
| /* |
| * The following macros are used to declare global sets of objects, which |
| * are collected by the linker into a `linker_set' as defined below. |
| * For ELF, this is done by constructing a separate segment for each set. |
| */ |
| |
| /* |
| * Private macros, not to be used outside this header file. |
| */ |
| #ifdef __GNUCLIKE___SECTION |
| #define __MAKE_SET(set, sym) \ |
| static void * __set_##set##_sym_##sym \ |
| __section("set_" #set) __used = &sym |
| #else /* !__GNUCLIKE___SECTION */ |
| #ifndef lint |
| #error this file needs to be ported to your compiler |
| #endif /* lint */ |
| #define __MAKE_SET(set, sym) extern void const * const (__set_##set##_sym_##sym) |
| #endif /* __GNUCLIKE___SECTION */ |
| |
| /* |
| * Public macros. |
| */ |
| #define TEXT_SET(set, sym) __MAKE_SET(set, sym) |
| #define DATA_SET(set, sym) __MAKE_SET(set, sym) |
| #define BSS_SET(set, sym) __MAKE_SET(set, sym) |
| #define ABS_SET(set, sym) __MAKE_SET(set, sym) |
| #define SET_ENTRY(set, sym) __MAKE_SET(set, sym) |
| |
| /* |
| * Initialize before referring to a given linker set. |
| */ |
| #define SET_DECLARE(set, ptype) \ |
| extern ptype *__CONCAT(__start_set_,set); \ |
| extern ptype *__CONCAT(__stop_set_,set) |
| |
| #define SET_BEGIN(set) \ |
| (&__CONCAT(__start_set_,set)) |
| #define SET_LIMIT(set) \ |
| (&__CONCAT(__stop_set_,set)) |
| |
| /* |
| * Iterate over all the elements of a set. |
| * |
| * Sets always contain addresses of things, and "pvar" points to words |
| * containing those addresses. Thus is must be declared as "type **pvar", |
| * and the address of each set item is obtained inside the loop by "*pvar". |
| */ |
| #define SET_FOREACH(pvar, set) \ |
| for (pvar = SET_BEGIN(set); pvar < SET_LIMIT(set); pvar++) |
| |
| #define SET_ITEM(set, i) \ |
| ((SET_BEGIN(set))[i]) |
| |
| /* |
| * Provide a count of the items in a set. |
| */ |
| #define SET_COUNT(set) \ |
| (SET_LIMIT(set) - SET_BEGIN(set)) |
| |
| #endif /* _BSD_SYS_LINKER_SET_H_ */ |
