diff options
Diffstat (limited to 'usr/contrib/freebsd/sys/linker_set.h')
| -rw-r--r-- | usr/contrib/freebsd/sys/linker_set.h | 119 |
1 files changed, 119 insertions, 0 deletions
diff --git a/usr/contrib/freebsd/sys/linker_set.h b/usr/contrib/freebsd/sys/linker_set.h new file mode 100644 index 0000000000..d766c5e2db --- /dev/null +++ b/usr/contrib/freebsd/sys/linker_set.h @@ -0,0 +1,119 @@ +/*- + * 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: head/sys/sys/linker_set.h 215701 2010-11-22 19:32:54Z dim $ + */ + +#ifndef _SYS_LINKER_SET_H_ +#define _SYS_LINKER_SET_H_ + +#ifdef __FreeBSD__ +#ifndef _SYS_CDEFS_H_ +#error this file needs sys/cdefs.h as a prerequisite +#endif +#else +#ifndef _COMPAT_FREEBSD_SYS_CDEFS_H_ +#error this file needs sys/cdefs.h as a prerequisite +#endif +#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 +#ifdef __FreeBSD__ +#define __MAKE_SET(set, sym) \ + __GLOBL(__CONCAT(__start_set_,set)); \ + __GLOBL(__CONCAT(__stop_set_,set)); \ + static void const * const __set_##set##_sym_##sym \ + __section("set_" #set) __used = &sym +#else +#define __MAKE_SET(set, sym) \ + static void const * const __set_##set##_sym_##sym \ + __section("set_" #set) __used = &sym +#endif +#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. + */ +#if defined(__FreeBSD__) || defined(_KERNEL) +#define SET_DECLARE(set, ptype) \ + extern ptype *__CONCAT(__start_set_,set); \ + extern ptype *__CONCAT(__stop_set_,set) +#else +#define SET_DECLARE(set, ptype) \ + _Pragma(__XSTRING(weak __CONCAT(__start_set_,set))) \ + _Pragma(__XSTRING(weak __CONCAT(__stop_set_,set))) \ + extern ptype *__CONCAT(__start_set_,set); \ + extern ptype *__CONCAT(__stop_set_,set) +#endif + +#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_ */ |