5fbf2e0992
This patch defines a few new macros that can be used to control the visibility of symbols exported by the C library: - ENTRY_PRIVATE() can be used in assembly sources to indicate that an assembler function should have "hidden" visibility, i.e. will never be exported by the C library's shared library. This is the equivalent of using __LIBC_HIDDEN__ for a C function, but ENTRY_PRIVATE() works like ENTRY(), and must be used with END() to tag the end of the function. - __LIBC_ABI_PUBLIC__ can be used to tag a C functions as being part of the C library's public ABI. This is important for a few functions that must be exposed by the NDK to maintain binary compatibility. Once a symbol has been tagged with this macro, it shall *never* be removed from the library, even if it becomes directly unused due to implementation changes (e.g. __is_threaded). - __LIBC_ABI_PRIVATE__ can be used for C functions that should always be exported by the C library because they are used by other libraries in the platform, but should not be exposed by the NDK. It is possible to remove such symbols from the implementation if all callers are also modified. + Add missing END() assembly macro for x86 Change-Id: Ia96236ea0dbec41d57bea634b39d246b30e5e234
172 lines
5.8 KiB
C
172 lines
5.8 KiB
C
/* $NetBSD: cdefs_elf.h,v 1.22 2005/02/26 22:25:34 perry Exp $ */
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/*
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* Copyright (c) 1995, 1996 Carnegie-Mellon University.
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* All rights reserved.
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*
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* Author: Chris G. Demetriou
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*
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* Permission to use, copy, modify and distribute this software and
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* its documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
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* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
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* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* Carnegie Mellon requests users of this software to return to
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*
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* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
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* School of Computer Science
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* Carnegie Mellon University
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* Pittsburgh PA 15213-3890
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*
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* any improvements or extensions that they make and grant Carnegie the
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* rights to redistribute these changes.
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*/
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#ifndef _SYS_CDEFS_ELF_H_
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#define _SYS_CDEFS_ELF_H_
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#ifdef __LEADING_UNDERSCORE
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#define _C_LABEL(x) __CONCAT(_,x)
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#define _C_LABEL_STRING(x) "_"x
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#else
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#define _C_LABEL(x) x
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#define _C_LABEL_STRING(x) x
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#endif
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#if __STDC__
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#define ___RENAME(x) __asm__(___STRING(_C_LABEL(x)))
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#else
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#ifdef __LEADING_UNDERSCORE
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#define ___RENAME(x) ____RENAME(_/**/x)
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#define ____RENAME(x) __asm__(___STRING(x))
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#else
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#define ___RENAME(x) __asm__(___STRING(x))
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#endif
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#endif
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#define __indr_reference(sym,alias) /* nada, since we do weak refs */
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#if __STDC__
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#define __strong_alias(alias,sym) \
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__asm__(".global " _C_LABEL_STRING(#alias) "\n" \
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_C_LABEL_STRING(#alias) " = " _C_LABEL_STRING(#sym));
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#define __weak_alias(alias,sym) \
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__asm__(".weak " _C_LABEL_STRING(#alias) "\n" \
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_C_LABEL_STRING(#alias) " = " _C_LABEL_STRING(#sym));
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#define __weak_extern(sym) \
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__asm__(".weak " _C_LABEL_STRING(#sym));
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#define __warn_references(sym,msg) \
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__asm__(".section .gnu.warning." #sym "\n\t.ascii \"" msg "\"\n\t.text");
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#else /* !__STDC__ */
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#ifdef __LEADING_UNDERSCORE
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#define __weak_alias(alias,sym) ___weak_alias(_/**/alias,_/**/sym)
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#define ___weak_alias(alias,sym) \
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__asm__(".weak alias\nalias = sym");
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#else
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#define __weak_alias(alias,sym) \
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__asm__(".weak alias\nalias = sym");
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#endif
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#ifdef __LEADING_UNDERSCORE
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#define __weak_extern(sym) ___weak_extern(_/**/sym)
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#define ___weak_extern(sym) \
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__asm__(".weak sym");
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#else
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#define __weak_extern(sym) \
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__asm__(".weak sym");
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#endif
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#define __warn_references(sym,msg) \
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__asm__(".section .gnu.warning.sym\n\t.ascii msg ; .text");
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#endif /* !__STDC__ */
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#if __STDC__
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#define __SECTIONSTRING(_sec, _str) \
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__asm__(".section " #_sec "\n\t.asciz \"" _str "\"\n\t.previous")
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#else
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#define __SECTIONSTRING(_sec, _str) \
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__asm__(".section _sec\n\t.asciz _str\n\t.previous")
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#endif
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/* GCC visibility helper macro */
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/* This must be used to tag non-static functions that are private, i.e.
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* never exposed by the shared library. */
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#define __LIBC_HIDDEN__ \
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__attribute__ ((visibility ("hidden")))
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/* This must be used to tag non-static functions that are public, i.e.
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* exposed by the shared library, and part of the stable NDK ABI */
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#define __LIBC_ABI_PUBLIC__ \
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__attribute__ ((visibility ("default")))
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/* This must be used to tag non-static functions that must be exported
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* by the shared library, but whose implementation is private to the
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* platform. For now this is equivalent to __LIBC_ABI_PUBLIC__, but we
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* may want to change this later.
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*/
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#define __LIBC_ABI_PRIVATE__ \
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__attribute__ ((visibility ("default")))
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#define __IDSTRING(_n,_s) __SECTIONSTRING(.ident,_s)
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#define __RCSID(_s) __IDSTRING(rcsid,_s)
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#define __SCCSID(_s)
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#define __SCCSID2(_s)
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#if 0 /* XXX userland __COPYRIGHTs have \ns in them */
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#define __COPYRIGHT(_s) __SECTIONSTRING(.copyright,_s)
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#else
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#define __COPYRIGHT(_s) \
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static const char copyright[] \
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__attribute__((__unused__,__section__(".copyright"))) = _s
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#endif
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#define __KERNEL_RCSID(_n, _s) __RCSID(_s)
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#define __KERNEL_SCCSID(_n, _s)
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#if 0 /* XXX see above */
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#define __KERNEL_COPYRIGHT(_n, _s) __COPYRIGHT(_s)
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#else
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#define __KERNEL_COPYRIGHT(_n, _s) __SECTIONSTRING(.copyright, _s)
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#endif
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#ifndef __lint__
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#define __link_set_make_entry(set, sym) \
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static void const * const __link_set_##set##_sym_##sym \
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__section("link_set_" #set) __used = &sym
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#define __link_set_make_entry2(set, sym, n) \
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static void const * const __link_set_##set##_sym_##sym##_##n \
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__section("link_set_" #set) __used = &sym[n]
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#else
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#define __link_set_make_entry(set, sym) \
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extern void const * const __link_set_##set##_sym_##sym
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#define __link_set_make_entry2(set, sym, n) \
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extern void const * const __link_set_##set##_sym_##sym##_##n
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#endif /* __lint__ */
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#define __link_set_add_text(set, sym) __link_set_make_entry(set, sym)
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#define __link_set_add_rodata(set, sym) __link_set_make_entry(set, sym)
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#define __link_set_add_data(set, sym) __link_set_make_entry(set, sym)
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#define __link_set_add_bss(set, sym) __link_set_make_entry(set, sym)
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#define __link_set_add_text2(set, sym, n) __link_set_make_entry2(set, sym, n)
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#define __link_set_add_rodata2(set, sym, n) __link_set_make_entry2(set, sym, n)
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#define __link_set_add_data2(set, sym, n) __link_set_make_entry2(set, sym, n)
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#define __link_set_add_bss2(set, sym, n) __link_set_make_entry2(set, sym, n)
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#define __link_set_decl(set, ptype) \
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extern ptype * const __start_link_set_##set[]; \
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extern ptype * const __stop_link_set_##set[] \
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#define __link_set_start(set) (__start_link_set_##set)
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#define __link_set_end(set) (__stop_link_set_##set)
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#define __link_set_count(set) \
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(__link_set_end(set) - __link_set_start(set))
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#endif /* !_SYS_CDEFS_ELF_H_ */
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