mirror of
git://sourceware.org/git/glibc.git
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4547dee327
* include/libc-symbols.h: Fix [__ASSEMBLY__] -> [__ASSEMBLER__]. [__ASSEMBLER__] (hidden_weak): Define using hidden_def, or to empty. [__ASSEMBLER__] (HIDDEN_JUMPTARGET): New macro. * sysdeps/unix/sysv/linux/i386/makecontext.S: Use it for exit.
568 lines
20 KiB
C
568 lines
20 KiB
C
/* Support macros for making weak and strong aliases for symbols,
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and for using symbol sets and linker warnings with GNU ld.
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Copyright (C) 1995-1998,2000,2001,2002 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#ifndef _LIBC_SYMBOLS_H
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#define _LIBC_SYMBOLS_H 1
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/* This file's macros are included implicitly in the compilation of every
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file in the C library by -imacros.
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We include config.h which is generated by configure.
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It should define for us the following symbols:
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* HAVE_ASM_SET_DIRECTIVE if we have `.set B, A' instead of `A = B'.
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* ASM_GLOBAL_DIRECTIVE with `.globl' or `.global'.
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* HAVE_GNU_LD if using GNU ld, with support for weak symbols in a.out,
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and for symbol set and warning messages extensions in a.out and ELF.
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* HAVE_ELF if using ELF, which supports weak symbols using `.weak'.
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* HAVE_ASM_WEAK_DIRECTIVE if we have weak symbols using `.weak'.
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* HAVE_ASM_WEAKEXT_DIRECTIVE if we have weak symbols using `.weakext'.
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*/
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/* This is defined for the compilation of all C library code. features.h
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tests this to avoid inclusion of stubs.h while compiling the library,
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before stubs.h has been generated. Some library code that is shared
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with other packages also tests this symbol to see if it is being
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compiled as part of the C library. We must define this before including
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config.h, because it makes some definitions conditional on whether libc
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itself is being compiled, or just some generator program. */
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#define _LIBC 1
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/* Enable declarations of GNU extensions, since we are compiling them. */
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#define _GNU_SOURCE 1
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/* And we also need the data for the reentrant functions. */
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#define _REENTRANT 1
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#include <config.h>
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/* The symbols in all the user (non-_) macros are C symbols.
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HAVE_GNU_LD without HAVE_ELF implies a.out. */
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#if defined HAVE_ASM_WEAK_DIRECTIVE || defined HAVE_ASM_WEAKEXT_DIRECTIVE
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# define HAVE_WEAK_SYMBOLS
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#endif
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#ifndef __SYMBOL_PREFIX
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# ifdef NO_UNDERSCORES
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# define __SYMBOL_PREFIX
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# else
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# define __SYMBOL_PREFIX "_"
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# endif
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#endif
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#ifndef C_SYMBOL_NAME
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# ifdef NO_UNDERSCORES
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# define C_SYMBOL_NAME(name) name
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# else
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# define C_SYMBOL_NAME(name) _##name
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# endif
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#endif
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#ifndef ASM_LINE_SEP
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# define ASM_LINE_SEP ;
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#endif
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#ifndef C_SYMBOL_DOT_NAME
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# define C_SYMBOL_DOT_NAME(name) .##name
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#endif
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#ifndef __ASSEMBLER__
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/* GCC understands weak symbols and aliases; use its interface where
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possible, instead of embedded assembly language. */
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/* Define ALIASNAME as a strong alias for NAME. */
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# define strong_alias(name, aliasname) _strong_alias(name, aliasname)
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# define _strong_alias(name, aliasname) \
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extern __typeof (name) aliasname __attribute__ ((alias (#name)));
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/* This comes between the return type and function name in
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a function definition to make that definition weak. */
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# define weak_function __attribute__ ((weak))
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# define weak_const_function __attribute__ ((weak, __const__))
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# ifdef HAVE_WEAK_SYMBOLS
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/* Define ALIASNAME as a weak alias for NAME.
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If weak aliases are not available, this defines a strong alias. */
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# define weak_alias(name, aliasname) _weak_alias (name, aliasname)
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# define _weak_alias(name, aliasname) \
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extern __typeof (name) aliasname __attribute__ ((weak, alias (#name)));
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/* Declare SYMBOL as weak undefined symbol (resolved to 0 if not defined). */
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# define weak_extern(symbol) _weak_extern (symbol)
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# ifdef HAVE_ASM_WEAKEXT_DIRECTIVE
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# define _weak_extern(symbol) asm (".weakext " __SYMBOL_PREFIX #symbol);
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# else
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# define _weak_extern(symbol) asm (".weak " __SYMBOL_PREFIX #symbol);
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# endif
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# else
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# define weak_alias(name, aliasname) strong_alias(name, aliasname)
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# define weak_extern(symbol) /* Nothing. */
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# endif
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#else /* __ASSEMBLER__ */
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# ifdef HAVE_ASM_SET_DIRECTIVE
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# define strong_alias(original, alias) \
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ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME (alias) ASM_LINE_SEP \
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.set C_SYMBOL_NAME (alias),C_SYMBOL_NAME (original)
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# else
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# ifdef HAVE_ASM_GLOBAL_DOT_NAME
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# define strong_alias(original, alias) \
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ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME (alias) ASM_LINE_SEP \
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C_SYMBOL_NAME (alias) = C_SYMBOL_NAME (original) ASM_LINE_SEP \
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ASM_GLOBAL_DIRECTIVE C_SYMBOL_DOT_NAME (alias) ASM_LINE_SEP \
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C_SYMBOL_DOT_NAME (alias) = C_SYMBOL_DOT_NAME (original)
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# else
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# define strong_alias(original, alias) \
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ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME (alias) ASM_LINE_SEP \
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C_SYMBOL_NAME (alias) = C_SYMBOL_NAME (original)
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# endif
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# endif
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# ifdef HAVE_WEAK_SYMBOLS
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# ifdef HAVE_ASM_WEAKEXT_DIRECTIVE
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# define weak_alias(original, alias) \
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.weakext C_SYMBOL_NAME (alias), C_SYMBOL_NAME (original)
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# define weak_extern(symbol) \
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.weakext C_SYMBOL_NAME (symbol)
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# else /* ! HAVE_ASM_WEAKEXT_DIRECTIVE */
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# ifdef HAVE_ASM_GLOBAL_DOT_NAME
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# define weak_alias(original, alias) \
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.weak C_SYMBOL_NAME (alias) ASM_LINE_SEP \
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C_SYMBOL_NAME (alias) = C_SYMBOL_NAME (original) ASM_LINE_SEP \
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ASM_GLOBAL_DIRECTIVE C_SYMBOL_DOT_NAME (alias) ASM_LINE_SEP \
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C_SYMBOL_DOT_NAME (alias) = C_SYMBOL_DOT_NAME (original)
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# else
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# define weak_alias(original, alias) \
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.weak C_SYMBOL_NAME (alias) ASM_LINE_SEP \
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C_SYMBOL_NAME (alias) = C_SYMBOL_NAME (original)
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# endif
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# define weak_extern(symbol) \
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.weak C_SYMBOL_NAME (symbol)
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# endif /* ! HAVE_ASM_WEAKEXT_DIRECTIVE */
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# else /* ! HAVE_WEAK_SYMBOLS */
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# define weak_alias(original, alias) strong_alias(original, alias)
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# define weak_extern(symbol) /* Nothing */
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# endif /* ! HAVE_WEAK_SYMBOLS */
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#endif /* __ASSEMBLER__ */
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/* On some platforms we can make internal function calls (i.e., calls of
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functions not exported) a bit faster by using a different calling
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convention. */
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#ifndef internal_function
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# define internal_function /* empty */
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#endif
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/* Prepare for the case that `__builtin_expect' is not available. */
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#ifndef HAVE_BUILTIN_EXPECT
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# define __builtin_expect(expr, val) (expr)
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#endif
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/* Determine the return address. */
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#define RETURN_ADDRESS(nr) \
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__builtin_extract_return_addr (__builtin_return_address (nr))
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/* When a reference to SYMBOL is encountered, the linker will emit a
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warning message MSG. */
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#ifdef HAVE_GNU_LD
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# ifdef HAVE_ELF
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/* We want the .gnu.warning.SYMBOL section to be unallocated. */
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# ifdef HAVE_ASM_PREVIOUS_DIRECTIVE
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# define __make_section_unallocated(section_string) \
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asm (".section " section_string "\n\t.previous");
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# elif defined HAVE_ASM_POPSECTION_DIRECTIVE
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# define __make_section_unallocated(section_string) \
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asm (".pushsection " section_string "\n\t.popsection");
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# else
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# define __make_section_unallocated(section_string)
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# endif
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/* Tacking on "\n\t#" to the section name makes gcc put it's bogus
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section attributes on what looks like a comment to the assembler. */
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# ifdef HAVE_SECTION_QUOTES
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# define link_warning(symbol, msg) \
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__make_section_unallocated (".gnu.warning." #symbol) \
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static const char __evoke_link_warning_##symbol[] \
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__attribute__ ((unused, section (".gnu.warning." #symbol "\"\n\t#\""))) \
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= msg;
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# else
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# define link_warning(symbol, msg) \
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__make_section_unallocated (".gnu.warning." #symbol) \
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static const char __evoke_link_warning_##symbol[] \
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__attribute__ ((unused, section (".gnu.warning." #symbol "\n\t#"))) = msg;
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# endif
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# else /* Not ELF: a.out */
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# ifdef HAVE_XCOFF
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/* XCOFF does not support .stabs.
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The native aix linker will remove the .stab and .stabstr sections
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The gnu linker will have a fatal error if there is a relocation for
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symbol in the .stab section. Silently disable this macro. */
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# define link_warning(symbol, msg)
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# else
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# define link_warning(symbol, msg) \
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asm (".stabs \"" msg "\",30,0,0,0\n\t" \
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".stabs \"" __SYMBOL_PREFIX #symbol "\",1,0,0,0\n");
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# endif /* XCOFF */
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# endif
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#else
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/* We will never be heard; they will all die horribly. */
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# define link_warning(symbol, msg)
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#endif
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/* A canned warning for sysdeps/stub functions. */
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#define stub_warning(name) \
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link_warning (name, \
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"warning: " #name " is not implemented and will always fail")
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/*
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*/
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#ifdef HAVE_GNU_LD
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/* Symbol set support macros. */
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# ifdef HAVE_ELF
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/* Make SYMBOL, which is in the text segment, an element of SET. */
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# define text_set_element(set, symbol) _elf_set_element(set, symbol)
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/* Make SYMBOL, which is in the data segment, an element of SET. */
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# define data_set_element(set, symbol) _elf_set_element(set, symbol)
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/* Make SYMBOL, which is in the bss segment, an element of SET. */
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# define bss_set_element(set, symbol) _elf_set_element(set, symbol)
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/* These are all done the same way in ELF.
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There is a new section created for each set. */
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# ifdef SHARED
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/* When building a shared library, make the set section writable,
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because it will need to be relocated at run time anyway. */
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# define _elf_set_element(set, symbol) \
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static const void *__elf_set_##set##_element_##symbol##__ \
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__attribute__ ((unused, section (#set))) = &(symbol)
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# else
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# define _elf_set_element(set, symbol) \
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static const void *const __elf_set_##set##_element_##symbol##__ \
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__attribute__ ((unused, section (#set))) = &(symbol)
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# endif
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/* Define SET as a symbol set. This may be required (it is in a.out) to
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be able to use the set's contents. */
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# define symbol_set_define(set) symbol_set_declare(set)
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/* Declare SET for use in this module, if defined in another module. */
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# define symbol_set_declare(set) \
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extern void *const __start_##set __attribute__ ((__weak__)); \
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extern void *const __stop_##set __attribute__ ((__weak__)); \
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weak_extern (__start_##set) weak_extern (__stop_##set)
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/* Return a pointer (void *const *) to the first element of SET. */
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# define symbol_set_first_element(set) (&__start_##set)
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/* Return true iff PTR (a void *const *) has been incremented
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past the last element in SET. */
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# define symbol_set_end_p(set, ptr) ((ptr) >= &__stop_##set)
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# else /* Not ELF: a.out. */
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# ifdef HAVE_XCOFF
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/* XCOFF does not support .stabs.
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The native aix linker will remove the .stab and .stabstr sections
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The gnu linker will have a fatal error if there is a relocation for
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symbol in the .stab section. Silently disable these macros. */
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# define text_set_element(set, symbol)
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# define data_set_element(set, symbol)
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# define bss_set_element(set, symbol)
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# else
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# define text_set_element(set, symbol) \
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asm (".stabs \"" __SYMBOL_PREFIX #set "\",23,0,0," __SYMBOL_PREFIX #symbol)
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# define data_set_element(set, symbol) \
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asm (".stabs \"" __SYMBOL_PREFIX #set "\",25,0,0," __SYMBOL_PREFIX #symbol)
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# define bss_set_element(set, symbol) ?error Must use initialized data.
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# endif /* XCOFF */
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# define symbol_set_define(set) void *const (set)[1];
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# define symbol_set_declare(set) extern void *const (set)[1];
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# define symbol_set_first_element(set) &(set)[1]
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# define symbol_set_end_p(set, ptr) (*(ptr) == 0)
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# endif /* ELF. */
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#else
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/* We cannot do anything in generial. */
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# define text_set_element(set, symbol) asm ("")
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# define data_set_element(set, symbol) asm ("")
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# define bss_set_element(set, symbol) asm ("")
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# define symbol_set_define(set) void *const (set)[1];
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# define symbol_set_declare(set) extern void *const (set)[1];
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# define symbol_set_first_element(set) &(set)[1]
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# define symbol_set_end_p(set, ptr) (*(ptr) == 0)
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#endif /* Have GNU ld. */
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#if DO_VERSIONING
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# define symbol_version(real, name, version) \
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_symbol_version(real, name, version)
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# define default_symbol_version(real, name, version) \
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_default_symbol_version(real, name, version)
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# ifdef __ASSEMBLER__
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# define _symbol_version(real, name, version) \
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.symver real, name##@##version
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# define _default_symbol_version(real, name, version) \
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.symver real, name##@##@##version
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# else
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# define _symbol_version(real, name, version) \
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__asm__ (".symver " #real "," #name "@" #version)
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# define _default_symbol_version(real, name, version) \
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__asm__ (".symver " #real "," #name "@@" #version)
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# endif
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#else
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# define symbol_version(real, name, version)
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# define default_symbol_version(real, name, version) \
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strong_alias(real, name)
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#endif
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#if defined HAVE_VISIBILITY_ATTRIBUTE && defined SHARED
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# define attribute_hidden __attribute__ ((visibility ("hidden")))
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#else
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# define attribute_hidden
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#endif
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/* Handling on non-exported internal names. We have to do this only
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for shared code. */
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#ifdef SHARED
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# define INTUSE(name) name##_internal
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# define INTDEF(name) strong_alias (name, name##_internal)
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# define INTVARDEF(name) \
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_INTVARDEF (name, name##_internal)
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# if defined HAVE_VISIBILITY_ATTRIBUTE
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# define _INTVARDEF(name, aliasname) \
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extern __typeof (name) aliasname __attribute__ ((alias (#name), \
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visibility ("hidden")));
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# else
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# define _INTVARDEF(name, aliasname) \
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extern __typeof (name) aliasname __attribute__ ((alias (#name)));
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# endif
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# define INTDEF2(name, newname) strong_alias (name, newname##_internal)
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# define INTVARDEF2(name, newname) _INTVARDEF (name, newname##_internal)
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#else
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# define INTUSE(name) name
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# define INTDEF(name)
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# define INTVARDEF(name)
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# define INTDEF2(name, newname)
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# define INTVARDEF2(name, newname)
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#endif
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/* The following macros are used for PLT bypassing within libc.so
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(and if needed other libraries similarly).
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First of all, you need to have the function prototyped somewhere,
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say in foo/foo.h:
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int foo (int __bar);
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If calls to foo within libc.so should always go to foo defined in libc.so,
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then in include/foo.h you add:
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libc_hidden_proto (foo)
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line and after the foo function definition:
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int foo (int __bar)
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{
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return __bar;
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}
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libc_hidden_def (foo)
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or
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int foo (int __bar)
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{
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return __bar;
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}
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libc_hidden_weak (foo)
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If foo is normally just an alias (strong or weak) of some other function,
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you should use the normal strong_alias first, then add libc_hidden_def
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or libc_hidden_weak:
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int baz (int __bar)
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{
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return __bar;
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}
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strong_alias (baz, foo)
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libc_hidden_weak (foo)
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If the function should be internal to multiple objects, say ld.so and
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libc.so, the best way is to use:
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#if !defined NOT_IN_libc || defined IS_IN_rtld
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hidden_proto (foo)
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#endif
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in include/foo.h and the normal macros at all function definitions
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depending on what DSO they belong to.
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If versioned_symbol macro is used to define foo,
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libc_hidden_ver macro should be used, as in:
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int __real_foo (int __bar)
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{
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return __bar;
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}
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versioned_symbol (libc, __real_foo, foo, GLIBC_2_1);
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libc_hidden_ver (__real_foo, foo) */
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#if defined SHARED && defined DO_VERSIONING \
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&& !defined HAVE_BROKEN_ALIAS_ATTRIBUTE
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# ifndef __ASSEMBLER__
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# ifdef HAVE_BROKEN_VISIBILITY_ATTRIBUTE
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# define __hidden_proto_hiddenattr
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# else
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# define __hidden_proto_hiddenattr attribute_hidden
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# endif
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# define hidden_proto(name) __hidden_proto (name, __GI_##name)
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# define __hidden_proto(name, internal) \
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__typeof (name) internal; \
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__typeof (name) name __asm__ (__hidden_asmname (#internal)) \
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__hidden_proto_hiddenattr;
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# define __hidden_asmname(name) \
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__hidden_asmname1 (__USER_LABEL_PREFIX__, name)
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||
# define __hidden_asmname1(prefix, name) __hidden_asmname2(prefix, name)
|
||
# define __hidden_asmname2(prefix, name) #prefix name
|
||
# ifdef HAVE_ASM_SET_DIRECTIVE
|
||
# define __hidden_def1(original, alias) \
|
||
ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME (alias) ASM_LINE_SEP \
|
||
.set C_SYMBOL_NAME (alias), C_SYMBOL_NAME (original)
|
||
# else
|
||
# ifdef HAVE_ASM_GLOBAL_DOT_NAME
|
||
# define __hidden_def1(original, alias) \
|
||
ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME (alias) ASM_LINE_SEP \
|
||
C_SYMBOL_NAME (alias) = C_SYMBOL_NAME (original) ASM_LINE_SEP \
|
||
ASM_GLOBAL_DIRECTIVE C_SYMBOL_DOT_NAME (alias) ASM_LINE_SEP \
|
||
C_SYMBOL_DOT_NAME (alias) = C_SYMBOL_DOT_NAME (original)
|
||
# else
|
||
# define __hidden_def1(original, alias) \
|
||
ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME (alias) ASM_LINE_SEP \
|
||
C_SYMBOL_NAME (alias) = C_SYMBOL_NAME (original)
|
||
# endif
|
||
# endif
|
||
# define __hidden_def2(...) #__VA_ARGS__
|
||
# define __hidden_def3(...) __hidden_def2 (__VA_ARGS__)
|
||
# define hidden_def(name) \
|
||
__asm__ (__hidden_def3 (__hidden_def1 (__GI_##name, name)));
|
||
# define hidden_ver(local, name) \
|
||
__asm__ (__hidden_def3 (__hidden_def1 (local, __GI_##name)));
|
||
# ifdef HAVE_WEAK_SYMBOLS
|
||
# ifdef HAVE_ASM_WEAKEXT_DIRECTIVE
|
||
# define __hidden_weak1(original, alias) \
|
||
.weakext C_SYMBOL_NAME (alias), C_SYMBOL_NAME (original)
|
||
# else /* ! HAVE_ASM_WEAKEXT_DIRECTIVE */
|
||
# ifdef HAVE_ASM_GLOBAL_DOT_NAME
|
||
# define __hidden_weak1(original, alias) \
|
||
.weak C_SYMBOL_NAME (alias) ASM_LINE_SEP \
|
||
C_SYMBOL_NAME (alias) = C_SYMBOL_NAME (original) ASM_LINE_SEP \
|
||
ASM_GLOBAL_DIRECTIVE C_SYMBOL_DOT_NAME (alias) ASM_LINE_SEP \
|
||
C_SYMBOL_DOT_NAME (alias) = C_SYMBOL_DOT_NAME (original)
|
||
# else
|
||
# define __hidden_weak1(original, alias) \
|
||
.weak C_SYMBOL_NAME (alias) ASM_LINE_SEP \
|
||
C_SYMBOL_NAME (alias) = C_SYMBOL_NAME (original)
|
||
# endif
|
||
# endif
|
||
# define hidden_weak(name) \
|
||
__asm__ (__hidden_def3 (__hidden_weak1 (__GI_##name, name)));
|
||
# else
|
||
# define hidden_weak(name) hidden_def (name)
|
||
# endif
|
||
# else
|
||
/* For assembly, we need to do the opposite of what we do in C:
|
||
in assembly gcc __REDIRECT stuff is not in place, so functions
|
||
are defined by its normal name and we need to create the
|
||
__GI_* alias to it, in C __REDIRECT causes the function definition
|
||
to use __GI_* name and we need to add alias to the real name.
|
||
There is no reason to use hidden_weak over hidden_def in assembly,
|
||
but we provide it for consistency with the C usage.
|
||
hidden_proto doesn't make sense for assembly but the equivalent
|
||
is to call via the HIDDEN_JUMPTARGET macro einstead of JUMPTARGET. */
|
||
# define hidden_def(name) strong_alias (name, __GI_##name)
|
||
# define hidden_weak(name) hidden_def (name)
|
||
# define hidden_ver(local, name) strong_alias (local, __GI_##name)
|
||
# define HIDDEN_JUMPTARGET(name) __GI_##name
|
||
# endif
|
||
#else
|
||
# ifndef __ASSEMBLER__
|
||
# define hidden_proto(name)
|
||
# else
|
||
# define HIDDEN_JUMPTARGET(name) JUMPTARGET(name)
|
||
# endif /* Not __ASSEMBLER__ */
|
||
# define hidden_weak(name)
|
||
# define hidden_def(name)
|
||
# define hidden_ver(local, name)
|
||
#endif
|
||
|
||
#if !defined NOT_IN_libc
|
||
# define libc_hidden_proto(name) hidden_proto (name)
|
||
# define libc_hidden_def(name) hidden_def (name)
|
||
# define libc_hidden_weak(name) hidden_weak (name)
|
||
# define libc_hidden_ver(local, name) hidden_ver (local, name)
|
||
#else
|
||
# define libc_hidden_proto(name)
|
||
# define libc_hidden_def(name)
|
||
# define libc_hidden_weak(name)
|
||
# define libc_hidden_ver(local, name)
|
||
#endif
|
||
|
||
#if defined NOT_IN_libc && defined IS_IN_rtld
|
||
# define rtld_hidden_proto(name) hidden_proto (name)
|
||
# define rtld_hidden_def(name) hidden_def (name)
|
||
# define rtld_hidden_weak(name) hidden_weak (name)
|
||
# define rtld_hidden_ver(local, name) hidden_ver (local, name)
|
||
#else
|
||
# define rtld_hidden_proto(name)
|
||
# define rtld_hidden_def(name)
|
||
# define rtld_hidden_weak(name)
|
||
# define rtld_hidden_ver(local, name)
|
||
#endif
|
||
|
||
#if defined NOT_IN_libc && defined IS_IN_libm
|
||
# define libm_hidden_proto(name) hidden_proto (name)
|
||
# define libm_hidden_def(name) hidden_def (name)
|
||
# define libm_hidden_weak(name) hidden_weak (name)
|
||
# define libm_hidden_ver(local, name) hidden_ver (local, name)
|
||
#else
|
||
# define libm_hidden_proto(name)
|
||
# define libm_hidden_def(name)
|
||
# define libm_hidden_weak(name)
|
||
# define libm_hidden_ver(local, name)
|
||
#endif
|
||
|
||
#endif /* libc-symbols.h */
|