mirror of
https://sourceware.org/git/glibc.git
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c877418f2e
New macros. * elf/dl-close.c (free_mem): Use libc_freeres_fn macro, remove text_set_element. * elf/dl-libc.c (free_mem): Likewise. * iconv/gconv_conf.c (free_mem): Likewise. * iconv/gconv_db.c (free_mem): Likewise. * iconv/gconv_dl.c (free_mem): Likewise. * iconv/gconv_cache.c (free_mem): Likewise. * intl/finddomain.c (free_mem): Likewise. * intl/dcigettext.c (free_mem): Likewise. * locale/setlocale.c (free_mem): Likewise. * misc/fstab.c (fstab_free): Likewise. * nss/nsswitch.c (free_mem): Likewise. * posix/regcomp.c (free_mem): Likewise. * resolv/gai_misc.c (free_res): Likewise. * stdlib/fmtmsg.c (free_mem): Likewise. * sunrpc/clnt_perr.c (free_mem): Likewise. * sysdeps/generic/setenv.c (free_mem): Likewise. * sysdeps/unix/sysv/linux/shm_open.c (freeit): Likewise. * sysdeps/pthread/aio_misc.c (free_res): Likewise. * time/tzset.c (free_mem): Likewise. * malloc/mtrace.c (release_libc_mem): Add __libc_freeres_fn_section. * locale/loadarchive.c (_nl_archive_subfreeres): Likewise. * malloc/set-freeres.c (__libc_freeres): Likewise. * login/getutent.c: Include stdlib.h instead of stddef.h. (buffer): Change into pointer to utmp, add libc_freeres_ptr. (__getutent): Allocate buffer the first time it is run. * login/getutid.c: Include stdlib.h instead of stddef.h. (buffer): Change into pointer to utmp, add libc_freeres_ptr. (__getutid): Allocate buffer the first time it is run. * login/getutline.c: Include stdlib.h instead of stddef.h. (buffer): Change into pointer to utmp, add libc_freeres_ptr. (__getutline): Allocate buffer the first time it is run. * malloc/mtrace.c (malloc_trace_buffer): Change into char *. (mtrace): Allocate malloc_trace_buffer. * resolv/nsap_addr.c (inet_nsap_ntoa): Decrease size of tmpbuf. * resolv/ns_print.c (ns_sprintrrf): Decrease size of t. * string/strerror.c: Include libintl.h and errno.h. (buf): New variable. (strerror): Only allocate buffer if actually needed (unknown error). * time/tzfile.c (transitions): Add libc_freeres_ptr. (freeres): Remove. 2002-10-25 Jakub Jelinek <jakub@redhat.com> * include/libc-symbols.h (libc_freeres_ptr): New macro. * malloc/set-freeres.c (__libc_freeres_ptrs): Define using symbol_set_define. (__libc_freeres): Free all pointers in that section. * Makerules (build-shlib): Add $(LDSEDCMD-$(@F:lib%.so=%).so) to sed commands when creating .lds script. (LDSEDCMD-c.so): New variable. * inet/rcmd.c (ahostbuf): Change into char *. Add libc_freeres_ptr. (rcmd_af): Use strdup to allocate ahostbuf. * inet/rexec.c (ahostbuf): Change into char *. Add libc_freeres_ptr. (rexec_af): Use strdup to allocate ahostbuf. * stdio-common/reg-printf.c (printf_funcs): Remove. (__printf_arginfo_table): Change into printf_arginfo_function **. Add libc_freeres_ptr. (__register_printf_function): Allocate __printf_arginfo_table and __printf_function_table the first time it is called. * stdio-common/printf-parse.h (__printf_arginfo_table): Change into printf_arginfo_function **. (parse_one_spec): Add __builtin_expect. * grp/fgetgrent.c (buffer): Add libc_freeres_ptr. (free_mem): Remove. * inet/getnetgrent.c (buffer): Add libc_freeres_ptr. (free_mem): Remove. * intl/localealias.c (libc_freeres_ptr): Define if !_LIBC. (string_space, map): Add libc_freeres_ptr. (free_mem): Remove. * misc/efgcvt.c (FCVT_BUFPTR): Add libc_freeres_ptr. (free_mem): Remove. * misc/mntent.c (getmntent_buffer): Add libc_freeres_ptr. (free_mem): Remove. * crypt/md5-crypt.c (libc_freeres_ptr): Define if !_LIBC. (buffer): Add libc_freeres_ptr. (free_mem): Remove for _LIBC. * nss/getXXbyYY.c (buffer): Add libc_freeres_ptr. (free_mem): Remove. * nss/getXXent.c (buffer): Add libc_freeres_ptr. (free_mem): Remove. * pwd/fgetpwent.c (buffer): Add libc_freeres_ptr. (free_mem): Remove. * resolv/res_hconf.c (ifaddrs): Add libc_freeres_ptr. (free_mem): Remove. * shadow/fgetspent.c (buffer): Add libc_freeres_ptr. (free_mem): Remove. * sysdeps/posix/ttyname.c (getttyname_name): Add libc_freeres_ptr. (free_mem): Remove. * sysdeps/unix/sysv/linux/getsysstats.c (mount_proc): Add libc_freeres_ptr. (free_mem): Remove. * sysdeps/unix/sysv/linux/ttyname.c (getttyname_name, ttyname_buf): Add libc_freeres_ptr. (free_mem): Remove. 2002-10-30 Jakub Jelinek <jakub@redhat.com> * malloc/obstack.c [_LIBC] (obstack_free): Change into strong_alias instead of duplicating the whole function in libc.
740 lines
27 KiB
C
740 lines
27 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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* ASM_TYPE_DIRECTIVE_PREFIX with `@' or `#' or whatever for .type,
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or leave it undefined if there is no .type directive.
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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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#ifdef HAVE_ASM_GLOBAL_DOT_NAME
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# ifndef C_SYMBOL_DOT_NAME
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# if defined __GNUC__ && defined __GNUC_MINOR__ \
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&& (__GNUC__ << 16) + __GNUC_MINOR__ >= (3 << 16) + 1
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# define C_SYMBOL_DOT_NAME(name) .name
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# else
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# define C_SYMBOL_DOT_NAME(name) .##name
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# endif
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# endif
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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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# ifdef HAVE_ASM_GLOBAL_DOT_NAME
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# define _weak_extern(symbol) \
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asm (".weakext " __SYMBOL_PREFIX #symbol "\n\t" \
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".weakext ." __SYMBOL_PREFIX #symbol);
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# else
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# define _weak_extern(symbol) asm (".weakext " __SYMBOL_PREFIX #symbol);
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# endif
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# else
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# ifdef HAVE_ASM_GLOBAL_DOT_NAME
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# define _weak_extern(symbol) \
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asm (".weak " __SYMBOL_PREFIX #symbol "\n\t" \
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".weak ." __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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# 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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# 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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.set 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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.set C_SYMBOL_DOT_NAME (alias),C_SYMBOL_DOT_NAME (original)
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# define strong_data_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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# 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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# define strong_data_alias(original, alias) strong_alias(original, alias)
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# endif
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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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# define strong_data_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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# 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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# define strong_data_alias(original, alias) strong_alias(original, alias)
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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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# ifdef HAVE_ASM_GLOBAL_DOT_NAME
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# define weak_alias(original, alias) \
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.weakext C_SYMBOL_NAME (alias), C_SYMBOL_NAME (original) ASM_LINE_SEP \
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.weakext 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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.weakext 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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.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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.weak 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 __sec_comment "\"\n\t#\""
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# else
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# define __sec_comment "\n\t#"
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# endif
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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 __sec_comment))) \
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= msg;
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# define libc_freeres_ptr(decl) \
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__make_section_unallocated ("__libc_freeres_ptrs, \"aw\", @nobits") \
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decl __attribute__ ((section ("__libc_freeres_ptrs" __sec_comment)))
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# define __libc_freeres_fn_section \
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__attribute__ ((section ("__libc_freeres_fn")))
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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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# define libc_freeres_ptr(decl) decl
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# define __libc_freeres_fn_section
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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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# define libc_freeres_ptr(decl) decl
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# define __libc_freeres_fn_section
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#endif
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#define libc_freeres_fn(name) \
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static void name (void) __attribute_used__ __libc_freeres_fn_section; \
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text_set_element (__libc_subfreeres, name); \
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static void name (void)
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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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/* Declare SYMBOL to be TYPE (`function' or `object') and of SIZE bytes,
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when the assembler supports such declarations (such as in ELF).
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This is only necessary when defining something in assembly, or playing
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funny alias games where the size should be other than what the compiler
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thinks it is. */
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#define declare_symbol(symbol, type, size) \
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declare_symbol_1 (symbol, type, size)
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#ifdef ASM_TYPE_DIRECTIVE_PREFIX
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# ifdef __ASSEMBLER__
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# define declare_symbol_1(symbol, type, size) \
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.type C_SYMBOL_NAME (symbol), \
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declare_symbol_1_paste (ASM_TYPE_DIRECTIVE_PREFIX, type), size
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# define declare_symbol_1_paste(a, b) declare_symbol_1_paste_1 (a,b)
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# define declare_symbol_1_paste_1(a,b) a##b
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# else /* Not __ASSEMBLER__. */
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# define declare_symbol_1(symbol, type, size) \
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asm (".type " __SYMBOL_PREFIX #symbol ", " \
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declare_symbol_1_stringify (ASM_TYPE_DIRECTIVE_PREFIX) #type \
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"\n\t.size " __SYMBOL_PREFIX #symbol ", " #size);
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# define declare_symbol_1_stringify(x) declare_symbol_1_stringify_1 (x)
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# define declare_symbol_1_stringify_1(x) #x
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# endif /* __ASSEMBLER__ */
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#else
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# define declare_symbol_1(symbol, type, size) /* Nothing. */
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#endif
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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##__ \
|
||
__attribute__ ((unused, section (#set))) = &(symbol)
|
||
# endif
|
||
|
||
/* Define SET as a symbol set. This may be required (it is in a.out) to
|
||
be able to use the set's contents. */
|
||
# define symbol_set_define(set) symbol_set_declare(set)
|
||
|
||
/* Declare SET for use in this module, if defined in another module. */
|
||
# define symbol_set_declare(set) \
|
||
extern void *const __start_##set __attribute__ ((__weak__)); \
|
||
extern void *const __stop_##set __attribute__ ((__weak__)); \
|
||
weak_extern (__start_##set) weak_extern (__stop_##set)
|
||
|
||
/* Return a pointer (void *const *) to the first element of SET. */
|
||
# define symbol_set_first_element(set) (&__start_##set)
|
||
|
||
/* Return true iff PTR (a void *const *) has been incremented
|
||
past the last element in SET. */
|
||
# define symbol_set_end_p(set, ptr) ((ptr) >= &__stop_##set)
|
||
|
||
# else /* Not ELF: a.out. */
|
||
|
||
# ifdef HAVE_XCOFF
|
||
/* XCOFF does not support .stabs.
|
||
The native aix linker will remove the .stab and .stabstr sections
|
||
The gnu linker will have a fatal error if there is a relocation for
|
||
symbol in the .stab section. Silently disable these macros. */
|
||
# define text_set_element(set, symbol)
|
||
# define data_set_element(set, symbol)
|
||
# define bss_set_element(set, symbol)
|
||
# else
|
||
# define text_set_element(set, symbol) \
|
||
asm (".stabs \"" __SYMBOL_PREFIX #set "\",23,0,0," __SYMBOL_PREFIX #symbol)
|
||
# define data_set_element(set, symbol) \
|
||
asm (".stabs \"" __SYMBOL_PREFIX #set "\",25,0,0," __SYMBOL_PREFIX #symbol)
|
||
# define bss_set_element(set, symbol) ?error Must use initialized data.
|
||
# endif /* XCOFF */
|
||
# define symbol_set_define(set) void *const (set)[1];
|
||
# define symbol_set_declare(set) extern void *const (set)[1];
|
||
|
||
# define symbol_set_first_element(set) &(set)[1]
|
||
# define symbol_set_end_p(set, ptr) (*(ptr) == 0)
|
||
|
||
# endif /* ELF. */
|
||
#else
|
||
/* We cannot do anything in generial. */
|
||
# define text_set_element(set, symbol) asm ("")
|
||
# define data_set_element(set, symbol) asm ("")
|
||
# define bss_set_element(set, symbol) asm ("")
|
||
# define symbol_set_define(set) void *const (set)[1];
|
||
# define symbol_set_declare(set) extern void *const (set)[1];
|
||
|
||
# define symbol_set_first_element(set) &(set)[1]
|
||
# define symbol_set_end_p(set, ptr) (*(ptr) == 0)
|
||
#endif /* Have GNU ld. */
|
||
|
||
#if DO_VERSIONING
|
||
# define symbol_version(real, name, version) \
|
||
_symbol_version(real, name, version)
|
||
# define default_symbol_version(real, name, version) \
|
||
_default_symbol_version(real, name, version)
|
||
# ifdef __ASSEMBLER__
|
||
# ifdef HAVE_ASM_GLOBAL_DOT_NAME
|
||
# define _symbol_version(real, name, version) \
|
||
.symver real, name##@##version ASM_LINE_SEP \
|
||
.symver .##real, .##name##@##version
|
||
# define _default_symbol_version(real, name, version) \
|
||
.symver real, name##@##@##version ASM_LINE_SEP \
|
||
.symver .##real, .##name##@##@##version
|
||
# else
|
||
# define _symbol_version(real, name, version) \
|
||
.symver real, name##@##version
|
||
# define _default_symbol_version(real, name, version) \
|
||
.symver real, name##@##@##version
|
||
# endif
|
||
# else
|
||
# ifdef HAVE_ASM_GLOBAL_DOT_NAME
|
||
# define _symbol_version(real, name, version) \
|
||
__asm__ (".symver " #real "," #name "@" #version "\n\t" \
|
||
".symver ." #real ",." #name "@" #version)
|
||
# define _default_symbol_version(real, name, version) \
|
||
__asm__ (".symver " #real "," #name "@@" #version "\n\t" \
|
||
".symver ." #real ",." #name "@@" #version)
|
||
# else
|
||
# define _symbol_version(real, name, version) \
|
||
__asm__ (".symver " #real "," #name "@" #version)
|
||
# define _default_symbol_version(real, name, version) \
|
||
__asm__ (".symver " #real "," #name "@@" #version)
|
||
# endif
|
||
# endif
|
||
#else
|
||
# define symbol_version(real, name, version)
|
||
# define default_symbol_version(real, name, version) \
|
||
strong_alias(real, name)
|
||
#endif
|
||
|
||
#if defined HAVE_VISIBILITY_ATTRIBUTE && defined SHARED
|
||
# define attribute_hidden __attribute__ ((visibility ("hidden")))
|
||
#else
|
||
# define attribute_hidden
|
||
#endif
|
||
|
||
#if defined HAVE_TLS_MODEL_ATTRIBUTE
|
||
# define attribute_tls_model_ie __attribute__ ((tls_model ("initial-exec")))
|
||
#else
|
||
# define attribute_tls_model_ie
|
||
#endif
|
||
|
||
/* Handling on non-exported internal names. We have to do this only
|
||
for shared code. */
|
||
#ifdef SHARED
|
||
# define INTUSE(name) name##_internal
|
||
# define INTDEF(name) strong_alias (name, name##_internal)
|
||
# define INTVARDEF(name) \
|
||
_INTVARDEF (name, name##_internal)
|
||
# if defined HAVE_VISIBILITY_ATTRIBUTE
|
||
# define _INTVARDEF(name, aliasname) \
|
||
extern __typeof (name) aliasname __attribute__ ((alias (#name), \
|
||
visibility ("hidden")));
|
||
# else
|
||
# define _INTVARDEF(name, aliasname) \
|
||
extern __typeof (name) aliasname __attribute__ ((alias (#name)));
|
||
# endif
|
||
# define INTDEF2(name, newname) strong_alias (name, newname##_internal)
|
||
# define INTVARDEF2(name, newname) _INTVARDEF (name, newname##_internal)
|
||
#else
|
||
# define INTUSE(name) name
|
||
# define INTDEF(name)
|
||
# define INTVARDEF(name)
|
||
# define INTDEF2(name, newname)
|
||
# define INTVARDEF2(name, newname)
|
||
#endif
|
||
|
||
/* The following macros are used for PLT bypassing within libc.so
|
||
(and if needed other libraries similarly).
|
||
First of all, you need to have the function prototyped somewhere,
|
||
say in foo/foo.h:
|
||
|
||
int foo (int __bar);
|
||
|
||
If calls to foo within libc.so should always go to foo defined in libc.so,
|
||
then in include/foo.h you add:
|
||
|
||
libc_hidden_proto (foo)
|
||
|
||
line and after the foo function definition:
|
||
|
||
int foo (int __bar)
|
||
{
|
||
return __bar;
|
||
}
|
||
libc_hidden_def (foo)
|
||
|
||
or
|
||
|
||
int foo (int __bar)
|
||
{
|
||
return __bar;
|
||
}
|
||
libc_hidden_weak (foo)
|
||
|
||
Simularly for global data. If references to foo within libc.so should
|
||
always go to foo defined in libc.so, then in include/foo.h you add:
|
||
|
||
libc_hidden_proto (foo)
|
||
|
||
line and after foo's definition:
|
||
|
||
int foo = INITIAL_FOO_VALUE;
|
||
libc_hidden_data_def (foo)
|
||
|
||
or
|
||
|
||
int foo = INITIAL_FOO_VALUE;
|
||
libc_hidden_data_weak (foo)
|
||
|
||
If foo is normally just an alias (strong or weak) of some other function,
|
||
you should use the normal strong_alias first, then add libc_hidden_def
|
||
or libc_hidden_weak:
|
||
|
||
int baz (int __bar)
|
||
{
|
||
return __bar;
|
||
}
|
||
strong_alias (baz, foo)
|
||
libc_hidden_weak (foo)
|
||
|
||
If the function should be internal to multiple objects, say ld.so and
|
||
libc.so, the best way is to use:
|
||
|
||
#if !defined NOT_IN_libc || defined IS_IN_rtld
|
||
hidden_proto (foo)
|
||
#endif
|
||
|
||
in include/foo.h and the normal macros at all function definitions
|
||
depending on what DSO they belong to.
|
||
|
||
If versioned_symbol macro is used to define foo,
|
||
libc_hidden_ver macro should be used, as in:
|
||
|
||
int __real_foo (int __bar)
|
||
{
|
||
return __bar;
|
||
}
|
||
versioned_symbol (libc, __real_foo, foo, GLIBC_2_1);
|
||
libc_hidden_ver (__real_foo, foo) */
|
||
|
||
#if defined SHARED && defined DO_VERSIONING \
|
||
&& !defined HAVE_BROKEN_ALIAS_ATTRIBUTE && !defined NO_HIDDEN
|
||
# ifndef __ASSEMBLER__
|
||
# if !defined HAVE_VISIBILITY_ATTRIBUTE \
|
||
|| defined HAVE_BROKEN_VISIBILITY_ATTRIBUTE
|
||
# define __hidden_proto_hiddenattr(attrs...)
|
||
# else
|
||
# define __hidden_proto_hiddenattr(attrs...) \
|
||
__attribute__ ((visibility ("hidden"), ##attrs))
|
||
# endif
|
||
# define hidden_proto(name, attrs...) \
|
||
__hidden_proto (name, __GI_##name, ##attrs)
|
||
# define __hidden_proto(name, internal, attrs...) \
|
||
extern __typeof (name) internal; \
|
||
extern __typeof (name) name __asm__ (__hidden_asmname (#internal)) \
|
||
__hidden_proto_hiddenattr (attrs);
|
||
# define __hidden_asmname(name) \
|
||
__hidden_asmname1 (__USER_LABEL_PREFIX__, name)
|
||
# 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)
|
||
# ifdef HAVE_ASM_GLOBAL_DOT_NAME
|
||
# define __hidden_dot_def1(original, alias) ASM_LINE_SEP \
|
||
ASM_GLOBAL_DIRECTIVE C_SYMBOL_DOT_NAME (alias) ASM_LINE_SEP \
|
||
.set C_SYMBOL_DOT_NAME (alias), C_SYMBOL_DOT_NAME (original)
|
||
# else
|
||
# define __hidden_dot_def1(original, alias)
|
||
# endif
|
||
# else
|
||
# define __hidden_def1(original, alias) \
|
||
ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME (alias) ASM_LINE_SEP \
|
||
C_SYMBOL_NAME (alias) = C_SYMBOL_NAME (original)
|
||
# ifdef HAVE_ASM_GLOBAL_DOT_NAME
|
||
# define __hidden_dot_def1(original, alias) 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_dot_def1(original, alias)
|
||
# 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) \
|
||
__hidden_dot_def1 (__GI_##name, name)));
|
||
# define hidden_data_def(name) \
|
||
__asm__ (__hidden_def3 (__hidden_def1 (__GI_##name, name)));
|
||
# define hidden_ver(local, name) \
|
||
__asm__ (__hidden_def3 (__hidden_def1 (local, __GI_##name) \
|
||
__hidden_dot_def1 (local, __GI_##name)));
|
||
# define hidden_data_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)
|
||
# ifdef HAVE_ASM_GLOBAL_DOT_NAME
|
||
# define __hidden_dot_weak1(original, alias) ASM_LINE_SEP \
|
||
.weakext C_SYMBOL_DOT_NAME (alias), C_SYMBOL_DOT_NAME (original)
|
||
# else
|
||
# define __hidden_dot_weak1(original, alias)
|
||
# endif
|
||
# else /* ! HAVE_ASM_WEAKEXT_DIRECTIVE */
|
||
# define __hidden_weak1(original, alias) \
|
||
.weak C_SYMBOL_NAME (alias) ASM_LINE_SEP \
|
||
C_SYMBOL_NAME (alias) = C_SYMBOL_NAME (original)
|
||
# ifdef HAVE_ASM_GLOBAL_DOT_NAME
|
||
# define __hidden_dot_weak1(original, alias) ASM_LINE_SEP \
|
||
.weak C_SYMBOL_DOT_NAME (alias) ASM_LINE_SEP \
|
||
C_SYMBOL_DOT_NAME (alias) = C_SYMBOL_DOT_NAME (original)
|
||
# else
|
||
# define __hidden_dot_weak1(original, alias)
|
||
# endif
|
||
# endif
|
||
# define hidden_weak(name) \
|
||
__asm__ (__hidden_def3 (__hidden_weak1 (__GI_##name, name) \
|
||
__hidden_dot_weak1 (__GI_##name, name)));
|
||
# define hidden_data_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_data_def(name) strong_data_alias (name, __GI_##name)
|
||
# define hidden_data_weak(name) hidden_data_def (name)
|
||
# define hidden_data_ver(local, name) strong_data_alias (local, __GI_##name)
|
||
# ifdef HAVE_ASM_GLOBAL_DOT_NAME
|
||
# define HIDDEN_JUMPTARGET(name) .__GI_##name
|
||
# else
|
||
# define HIDDEN_JUMPTARGET(name) __GI_##name
|
||
# endif
|
||
# endif
|
||
#else
|
||
# ifndef __ASSEMBLER__
|
||
# define hidden_proto(name, attrs...)
|
||
# else
|
||
# define HIDDEN_JUMPTARGET(name) JUMPTARGET(name)
|
||
# endif /* Not __ASSEMBLER__ */
|
||
# define hidden_weak(name)
|
||
# define hidden_def(name)
|
||
# define hidden_ver(local, name)
|
||
# define hidden_data_weak(name)
|
||
# define hidden_data_def(name)
|
||
# define hidden_data_ver(local, name)
|
||
#endif
|
||
|
||
#if !defined NOT_IN_libc
|
||
# define libc_hidden_proto(name, attrs...) hidden_proto (name, ##attrs)
|
||
# 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)
|
||
# define libc_hidden_data_def(name) hidden_data_def (name)
|
||
# define libc_hidden_data_weak(name) hidden_data_weak (name)
|
||
# define libc_hidden_data_ver(local, name) hidden_data_ver (local, name)
|
||
#else
|
||
# define libc_hidden_proto(name, attrs...)
|
||
# define libc_hidden_def(name)
|
||
# define libc_hidden_weak(name)
|
||
# define libc_hidden_ver(local, name)
|
||
# define libc_hidden_data_def(name)
|
||
# define libc_hidden_data_weak(name)
|
||
# define libc_hidden_data_ver(local, name)
|
||
#endif
|
||
|
||
#if defined NOT_IN_libc && defined IS_IN_rtld
|
||
# define rtld_hidden_proto(name, attrs...) hidden_proto (name, ##attrs)
|
||
# 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)
|
||
# define rtld_hidden_data_def(name) hidden_data_def (name)
|
||
# define rtld_hidden_data_weak(name) hidden_data_weak (name)
|
||
# define rtld_hidden_data_ver(local, name) hidden_data_ver (local, name)
|
||
#else
|
||
# define rtld_hidden_proto(name, attrs...)
|
||
# define rtld_hidden_def(name)
|
||
# define rtld_hidden_weak(name)
|
||
# define rtld_hidden_ver(local, name)
|
||
# define rtld_hidden_data_def(name)
|
||
# define rtld_hidden_data_weak(name)
|
||
# define rtld_hidden_data_ver(local, name)
|
||
#endif
|
||
|
||
#if defined NOT_IN_libc && defined IS_IN_libm
|
||
# define libm_hidden_proto(name, attrs...) hidden_proto (name, ##attrs)
|
||
# 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)
|
||
# define libm_hidden_data_def(name) hidden_data_def (name)
|
||
# define libm_hidden_data_weak(name) hidden_data_weak (name)
|
||
# define libm_hidden_data_ver(local, name) hidden_data_ver (local, name)
|
||
#else
|
||
# define libm_hidden_proto(name, attrs...)
|
||
# define libm_hidden_def(name)
|
||
# define libm_hidden_weak(name)
|
||
# define libm_hidden_ver(local, name)
|
||
# define libm_hidden_data_def(name)
|
||
# define libm_hidden_data_weak(name)
|
||
# define libm_hidden_data_ver(local, name)
|
||
#endif
|
||
|
||
#endif /* libc-symbols.h */
|