diff options
Diffstat (limited to 'cpukit/libnetworking/sys/linker_set.h')
| -rw-r--r-- | cpukit/libnetworking/sys/linker_set.h | 93 |
1 files changed, 93 insertions, 0 deletions
diff --git a/cpukit/libnetworking/sys/linker_set.h b/cpukit/libnetworking/sys/linker_set.h new file mode 100644 index 0000000000..a2354ed397 --- /dev/null +++ b/cpukit/libnetworking/sys/linker_set.h @@ -0,0 +1,93 @@ +/*- + * 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: src/sys/sys/linker_set.h,v 1.13 2002/09/23 06:11:29 peter Exp $ + */ + +#ifndef _SYS_LINKER_SET_H_ +#define _SYS_LINKER_SET_H_ + +/* + * 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 __GNUC__ +#define __MAKE_SET(set, sym) \ + static void const * const __set_##set##_sym_##sym \ + __attribute((section("set_" #set))) __used = &sym +#else /* !__GNUC__ */ +#ifndef lint +#error "This file needs to be compiled by GCC or lint" +#endif /* lint */ +#define __MAKE_SET(set, sym) extern void const * const (__set_##set##_sym_##sym) +#endif /* __GNUC__ */ + +/* + * 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 give 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 /* _SYS_LINKER_SET_H_ */ |