xref: /bionic/libc/include/sys/cdefs_elf.h

/*	$NetBSD: cdefs_elf.h,v 1.22 2005/02/26 22:25:34 perry Exp $	*/

/*
 * Copyright (c) 1995, 1996 Carnegie-Mellon University.
 * All rights reserved.
 *
 * Author: Chris G. Demetriou
 *
 * Permission to use, copy, modify and distribute this software and
 * its documentation is hereby granted, provided that both the copyright
 * notice and this permission notice appear in all copies of the
 * software, derivative works or modified versions, and any portions
 * thereof, and that both notices appear in supporting documentation.
 *
 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
 * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
 *
 * Carnegie Mellon requests users of this software to return to
 *
 *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
 *  School of Computer Science
 *  Carnegie Mellon University
 *  Pittsburgh PA 15213-3890
 *
 * any improvements or extensions that they make and grant Carnegie the
 * rights to redistribute these changes.
 */

#ifndef _SYS_CDEFS_ELF_H_
#define	_SYS_CDEFS_ELF_H_

#ifdef __LEADING_UNDERSCORE
#define	_C_LABEL(x)	__CONCAT(_,x)
#define _C_LABEL_STRING(x)	"_"x
#else
#define	_C_LABEL(x)	x
#define _C_LABEL_STRING(x)	x
#endif

#if __STDC__
#define	___RENAME(x)	__asm__(___STRING(_C_LABEL(x)))
#else
#ifdef __LEADING_UNDERSCORE
#define	___RENAME(x)	____RENAME(_/**/x)
#define	____RENAME(x)	__asm__(___STRING(x))
#else
#define	___RENAME(x)	__asm__(___STRING(x))
#endif
#endif

#define	__indr_reference(sym,alias)	/* nada, since we do weak refs */

#if __STDC__
#define	__strong_alias(alias,sym)	       				\
    __asm__(".global " _C_LABEL_STRING(#alias) "\n"			\
	    _C_LABEL_STRING(#alias) " = " _C_LABEL_STRING(#sym));

#define	__weak_alias(alias,sym)						\
    __asm__(".weak " _C_LABEL_STRING(#alias) "\n"			\
	    _C_LABEL_STRING(#alias) " = " _C_LABEL_STRING(#sym));
#define	__weak_extern(sym)						\
    __asm__(".weak " _C_LABEL_STRING(#sym));
#define	__warn_references(sym,msg)					\
    __asm__(".section .gnu.warning." #sym "\n\t.ascii \"" msg "\"\n\t.text");

#else /* !__STDC__ */

#ifdef __LEADING_UNDERSCORE
#define __weak_alias(alias,sym) ___weak_alias(_/**/alias,_/**/sym)
#define	___weak_alias(alias,sym)					\
    __asm__(".weak alias\nalias = sym");
#else
#define	__weak_alias(alias,sym)						\
    __asm__(".weak alias\nalias = sym");
#endif
#ifdef __LEADING_UNDERSCORE
#define __weak_extern(sym) ___weak_extern(_/**/sym)
#define	___weak_extern(sym)						\
    __asm__(".weak sym");
#else
#define	__weak_extern(sym)						\
    __asm__(".weak sym");
#endif
#define	__warn_references(sym,msg)					\
    __asm__(".section .gnu.warning.sym\n\t.ascii msg ; .text");

#endif /* !__STDC__ */

#if __STDC__
#define	__SECTIONSTRING(_sec, _str)					\
	__asm__(".section " #_sec "\n\t.asciz \"" _str "\"\n\t.previous")
#else
#define	__SECTIONSTRING(_sec, _str)					\
	__asm__(".section _sec\n\t.asciz _str\n\t.previous")
#endif

/* GCC visibility helper macro */
/* This must be used to tag non-static functions that are private, i.e.
 * never exposed by the shared library. */
#define __LIBC_HIDDEN__							\
	__attribute__ ((visibility ("hidden")))

/* This must be used to tag non-static functions that are public, i.e.
 * exposed by the shared library, and part of the stable NDK ABI */
#define __LIBC_ABI_PUBLIC__ \
        __attribute__ ((visibility ("default")))

/* This must be used to tag non-static functions that must be exported
 * by the shared library, but whose implementation is private to the
 * platform. For now this is equivalent to __LIBC_ABI_PUBLIC__, but we
 * may want to change this later.
 */
#define __LIBC_ABI_PRIVATE__ \
        __attribute__ ((visibility ("default")))

#define	__IDSTRING(_n,_s)		__SECTIONSTRING(.ident,_s)

#define	__RCSID(_s)			__IDSTRING(rcsid,_s)
#define	__SCCSID(_s)
#define __SCCSID2(_s)
#if 0	/* XXX userland __COPYRIGHTs have \ns in them */
#define	__COPYRIGHT(_s)			__SECTIONSTRING(.copyright,_s)
#else
#define	__COPYRIGHT(_s)							\
	static const char copyright[]					\
	    __attribute__((__unused__,__section__(".copyright"))) = _s
#endif

#define	__KERNEL_RCSID(_n, _s)		__RCSID(_s)
#define	__KERNEL_SCCSID(_n, _s)
#if 0	/* XXX see above */
#define	__KERNEL_COPYRIGHT(_n, _s)	__COPYRIGHT(_s)
#else
#define	__KERNEL_COPYRIGHT(_n, _s)	__SECTIONSTRING(.copyright, _s)
#endif

#ifndef __lint__
#define	__link_set_make_entry(set, sym)					\
	static void const * const __link_set_##set##_sym_##sym		\
	    __section("link_set_" #set) __used = &sym
#define	__link_set_make_entry2(set, sym, n)				\
	static void const * const __link_set_##set##_sym_##sym##_##n	\
	    __section("link_set_" #set) __used = &sym[n]
#else
#define	__link_set_make_entry(set, sym)					\
	extern void const * const __link_set_##set##_sym_##sym
#define	__link_set_make_entry2(set, sym, n)				\
	extern void const * const __link_set_##set##_sym_##sym##_##n
#endif /* __lint__ */

#define	__link_set_add_text(set, sym)	__link_set_make_entry(set, sym)
#define	__link_set_add_rodata(set, sym)	__link_set_make_entry(set, sym)
#define	__link_set_add_data(set, sym)	__link_set_make_entry(set, sym)
#define	__link_set_add_bss(set, sym)	__link_set_make_entry(set, sym)
#define	__link_set_add_text2(set, sym, n)   __link_set_make_entry2(set, sym, n)
#define	__link_set_add_rodata2(set, sym, n) __link_set_make_entry2(set, sym, n)
#define	__link_set_add_data2(set, sym, n)   __link_set_make_entry2(set, sym, n)
#define	__link_set_add_bss2(set, sym, n)    __link_set_make_entry2(set, sym, n)

#define	__link_set_decl(set, ptype)					\
	extern ptype * const __start_link_set_##set[];			\
	extern ptype * const __stop_link_set_##set[]			\

#define	__link_set_start(set)	(__start_link_set_##set)
#define	__link_set_end(set)	(__stop_link_set_##set)

#define	__link_set_count(set)						\
	(__link_set_end(set) - __link_set_start(set))

#endif /* !_SYS_CDEFS_ELF_H_ */