/* Support macros for making weak and strong aliases for symbols,
and for using symbol sets and linker warnings with GNU ld.
- Copyright (C) 1995-1998,2000,2001,2002 Free Software Foundation, Inc.
+ Copyright (C) 1995-2016 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
- License along with the GNU C Library; if not, write to the Free
- Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
- 02111-1307 USA. */
+ License along with the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
#ifndef _LIBC_SYMBOLS_H
#define _LIBC_SYMBOLS_H 1
+#define IN_MODULE PASTE_NAME (MODULE_, MODULE_NAME)
+#define IS_IN(lib) (IN_MODULE == MODULE_##lib)
+
+/* Returns true if the current module is a versioned library. Versioned
+ library names culled from shlib-versions files are assigned a MODULE_*
+ value lower than MODULE_LIBS_BEGIN. */
+#define IS_IN_LIB (IN_MODULE > MODULE_LIBS_BEGIN)
+
+#define PASTE_NAME(a,b) PASTE_NAME1 (a,b)
+#define PASTE_NAME1(a,b) a##b
+
/* This file's macros are included implicitly in the compilation of every
file in the C library by -imacros.
We include config.h which is generated by configure.
- It should define for us the following symbols:
+ It should define for us the following symbol:
* HAVE_ASM_SET_DIRECTIVE if we have `.set B, A' instead of `A = B'.
- * ASM_GLOBAL_DIRECTIVE with `.globl' or `.global'.
- * HAVE_GNU_LD if using GNU ld, with support for weak symbols in a.out,
- and for symbol set and warning messages extensions in a.out and ELF.
- * HAVE_ELF if using ELF, which supports weak symbols using `.weak'.
- * HAVE_ASM_WEAK_DIRECTIVE if we have weak symbols using `.weak'.
- * HAVE_ASM_WEAKEXT_DIRECTIVE if we have weak symbols using `.weakext'.
*/
#include <config.h>
-/* The symbols in all the user (non-_) macros are C symbols.
- HAVE_GNU_LD without HAVE_ELF implies a.out. */
-
-#if defined HAVE_ASM_WEAK_DIRECTIVE || defined HAVE_ASM_WEAKEXT_DIRECTIVE
-# define HAVE_WEAK_SYMBOLS
-#endif
+/* Define this for the benefit of portable GNU code that wants to check it.
+ Code that checks with #if will not #include <config.h> again, since we've
+ already done it (and this file is implicitly included in every compile,
+ via -include). Code that checks with #ifdef will #include <config.h>,
+ but that file should always be idempotent (i.e., it's just #define/#undef
+ and nothing else anywhere should be changing the macro state it touches),
+ so it's harmless. */
+#define HAVE_CONFIG_H 0
+
+/* Define these macros for the benefit of portable GNU code that wants to check
+ them. Of course, STDC_HEADERS is never false when building libc! */
+#define STDC_HEADERS 1
+#define HAVE_MBSTATE_T 1
+#define HAVE_MBSRTOWCS 1
+#define HAVE_LIBINTL_H 1
+#define HAVE_WCTYPE_H 1
+#define HAVE_ISWCTYPE 1
+#define ENABLE_NLS 1
+
+/* The symbols in all the user (non-_) macros are C symbols. */
#ifndef __SYMBOL_PREFIX
-# ifdef NO_UNDERSCORES
-# define __SYMBOL_PREFIX
-# else
-# define __SYMBOL_PREFIX "_"
-# endif
+# define __SYMBOL_PREFIX
#endif
#ifndef C_SYMBOL_NAME
-# ifdef NO_UNDERSCORES
-# define C_SYMBOL_NAME(name) name
-# else
-# define C_SYMBOL_NAME(name) _##name
-# endif
+# define C_SYMBOL_NAME(name) name
#endif
#ifndef ASM_LINE_SEP
# define ASM_LINE_SEP ;
#endif
-#ifndef C_SYMBOL_DOT_NAME
-# define C_SYMBOL_DOT_NAME(name) .##name
-#endif
-
#ifndef __ASSEMBLER__
/* GCC understands weak symbols and aliases; use its interface where
possible, instead of embedded assembly language. */
# define weak_function __attribute__ ((weak))
# define weak_const_function __attribute__ ((weak, __const__))
-# ifdef HAVE_WEAK_SYMBOLS
-
/* Define ALIASNAME as a weak alias for NAME.
If weak aliases are not available, this defines a strong alias. */
-# define weak_alias(name, aliasname) _weak_alias (name, aliasname)
-# define _weak_alias(name, aliasname) \
+# define weak_alias(name, aliasname) _weak_alias (name, aliasname)
+# define _weak_alias(name, aliasname) \
extern __typeof (name) aliasname __attribute__ ((weak, alias (#name)));
-/* Declare SYMBOL as weak undefined symbol (resolved to 0 if not defined). */
-# define weak_extern(symbol) _weak_extern (symbol)
-# ifdef HAVE_ASM_WEAKEXT_DIRECTIVE
-# define _weak_extern(symbol) asm (".weakext " __SYMBOL_PREFIX #symbol);
-# else
-# define _weak_extern(symbol) asm (".weak " __SYMBOL_PREFIX #symbol);
-# endif
-
-# else
+/* Same as WEAK_ALIAS, but mark symbol as hidden. */
+# define weak_hidden_alias(name, aliasname) \
+ _weak_hidden_alias (name, aliasname)
+# define _weak_hidden_alias(name, aliasname) \
+ extern __typeof (name) aliasname \
+ __attribute__ ((weak, alias (#name), __visibility__ ("hidden")));
-# define weak_alias(name, aliasname) strong_alias(name, aliasname)
-# define weak_extern(symbol) /* Nothing. */
+/* Declare SYMBOL as weak undefined symbol (resolved to 0 if not defined). */
+# define weak_extern(symbol) _weak_extern (weak symbol)
+# define _weak_extern(expr) _Pragma (#expr)
-# endif
#else /* __ASSEMBLER__ */
# ifdef HAVE_ASM_SET_DIRECTIVE
-# define strong_alias(original, alias) \
- ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME (alias) ASM_LINE_SEP \
+# define strong_alias(original, alias) \
+ .globl C_SYMBOL_NAME (alias) ASM_LINE_SEP \
.set C_SYMBOL_NAME (alias),C_SYMBOL_NAME (original)
+# define strong_data_alias(original, alias) strong_alias(original, alias)
# else
-# ifdef HAVE_ASM_GLOBAL_DOT_NAME
-# define strong_alias(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 strong_alias(original, alias) \
- ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME (alias) ASM_LINE_SEP \
+# define strong_alias(original, alias) \
+ .globl C_SYMBOL_NAME (alias) ASM_LINE_SEP \
C_SYMBOL_NAME (alias) = C_SYMBOL_NAME (original)
-# endif
+# define strong_data_alias(original, alias) strong_alias(original, alias)
# endif
-# ifdef HAVE_WEAK_SYMBOLS
-# ifdef HAVE_ASM_WEAKEXT_DIRECTIVE
-# define weak_alias(original, alias) \
- .weakext C_SYMBOL_NAME (alias), C_SYMBOL_NAME (original)
-# define weak_extern(symbol) \
- .weakext C_SYMBOL_NAME (symbol)
-
-# else /* ! HAVE_ASM_WEAKEXT_DIRECTIVE */
-
-# ifdef HAVE_ASM_GLOBAL_DOT_NAME
-# define weak_alias(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 weak_alias(original, alias) \
- .weak C_SYMBOL_NAME (alias) ASM_LINE_SEP \
+# define weak_alias(original, alias) \
+ .weak C_SYMBOL_NAME (alias) ASM_LINE_SEP \
C_SYMBOL_NAME (alias) = C_SYMBOL_NAME (original)
-# endif
-# define weak_extern(symbol) \
+# define weak_extern(symbol) \
.weak C_SYMBOL_NAME (symbol)
-# endif /* ! HAVE_ASM_WEAKEXT_DIRECTIVE */
-
-# else /* ! HAVE_WEAK_SYMBOLS */
-
-# define weak_alias(original, alias) strong_alias(original, alias)
-# define weak_extern(symbol) /* Nothing */
-# endif /* ! HAVE_WEAK_SYMBOLS */
-
#endif /* __ASSEMBLER__ */
/* On some platforms we can make internal function calls (i.e., calls of
# define internal_function /* empty */
#endif
-/* Prepare for the case that `__builtin_expect' is not available. */
-#ifndef HAVE_BUILTIN_EXPECT
-# define __builtin_expect(expr, val) (expr)
-#endif
-
/* Determine the return address. */
#define RETURN_ADDRESS(nr) \
__builtin_extract_return_addr (__builtin_return_address (nr))
/* When a reference to SYMBOL is encountered, the linker will emit a
warning message MSG. */
-#ifdef HAVE_GNU_LD
-# ifdef HAVE_ELF
-
/* We want the .gnu.warning.SYMBOL section to be unallocated. */
-# ifdef HAVE_ASM_PREVIOUS_DIRECTIVE
-# define __make_section_unallocated(section_string) \
+#define __make_section_unallocated(section_string) \
asm (".section " section_string "\n\t.previous");
-# elif defined HAVE_ASM_POPSECTION_DIRECTIVE
-# define __make_section_unallocated(section_string) \
- asm (".pushsection " section_string "\n\t.popsection");
-# else
-# define __make_section_unallocated(section_string)
-# endif
/* Tacking on "\n\t#" to the section name makes gcc put it's bogus
section attributes on what looks like a comment to the assembler. */
-# ifdef HAVE_SECTION_QUOTES
-# define link_warning(symbol, msg) \
+#ifdef HAVE_SECTION_QUOTES
+# define __sec_comment "\"\n\t#\""
+#else
+# define __sec_comment "\n\t#"
+#endif
+#define link_warning(symbol, msg) \
__make_section_unallocated (".gnu.warning." #symbol) \
static const char __evoke_link_warning_##symbol[] \
- __attribute__ ((unused, section (".gnu.warning." #symbol "\"\n\t#\""))) \
+ __attribute__ ((used, section (".gnu.warning." #symbol __sec_comment))) \
= msg;
-# else
-# define link_warning(symbol, msg) \
- __make_section_unallocated (".gnu.warning." #symbol) \
- static const char __evoke_link_warning_##symbol[] \
- __attribute__ ((unused, section (".gnu.warning." #symbol "\n\t#"))) = msg;
-# endif
-# 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 this macro. */
-# define link_warning(symbol, msg)
-# else
-# define link_warning(symbol, msg) \
- asm (".stabs \"" msg "\",30,0,0,0\n\t" \
- ".stabs \"" __SYMBOL_PREFIX #symbol "\",1,0,0,0\n");
-# endif /* XCOFF */
-# endif
-#else
-/* We will never be heard; they will all die horribly. */
-# define link_warning(symbol, msg)
-#endif
+#define libc_freeres_ptr(decl) \
+ __make_section_unallocated ("__libc_freeres_ptrs, \"aw\", %nobits") \
+ decl __attribute__ ((section ("__libc_freeres_ptrs" __sec_comment)))
+#define __libc_freeres_fn_section \
+ __attribute__ ((section ("__libc_freeres_fn")))
+
+#define libc_freeres_fn(name) \
+ static void name (void) __attribute_used__ __libc_freeres_fn_section; \
+ text_set_element (__libc_subfreeres, name); \
+ static void name (void)
/* A canned warning for sysdeps/stub functions. */
#define stub_warning(name) \
- link_warning (name, \
- "warning: " #name " is not implemented and will always fail")
+ __make_section_unallocated (".gnu.glibc-stub." #name) \
+ link_warning (name, #name " is not implemented and will always fail")
+
+/* Warning for linking functions calling dlopen into static binaries. */
+#ifdef SHARED
+#define static_link_warning(name)
+#else
+#define static_link_warning(name) static_link_warning1(name)
+#define static_link_warning1(name) \
+ link_warning(name, "Using '" #name "' in statically linked applications \
+requires at runtime the shared libraries from the glibc version used \
+for linking")
+#endif
+
+/* Declare SYMBOL to be TYPE (`function' or `object') of SIZE bytes
+ alias to ORIGINAL, when the assembler supports such declarations
+ (such as in ELF).
+ This is only necessary when defining something in assembly, or playing
+ funny alias games where the size should be other than what the compiler
+ thinks it is. */
+#define declare_symbol_alias(symbol, original, type, size) \
+ declare_symbol_alias_1 (symbol, original, type, size)
+#ifdef __ASSEMBLER__
+# define declare_symbol_alias_1(symbol, original, type, size) \
+ strong_alias (original, symbol); \
+ .type C_SYMBOL_NAME (symbol), %##type; \
+ .size C_SYMBOL_NAME (symbol), size
+#else /* Not __ASSEMBLER__. */
+# define declare_symbol_alias_1(symbol, original, type, size) \
+ asm (".globl " __SYMBOL_PREFIX #symbol \
+ "\n\t" declare_symbol_alias_1_alias (symbol, original) \
+ "\n\t.type " __SYMBOL_PREFIX #symbol ", " \
+ "%" #type \
+ "\n\t.size " __SYMBOL_PREFIX #symbol ", " #size);
+# ifdef HAVE_ASM_SET_DIRECTIVE
+# define declare_symbol_alias_1_alias(symbol, original) \
+ ".set " __SYMBOL_PREFIX #symbol ", " __SYMBOL_PREFIX #original
+# else
+# define declare_symbol_alias_1_alias(symbol, original) \
+ __SYMBOL_PREFIX #symbol " = " __SYMBOL_PREFIX #original
+# endif /* HAVE_ASM_SET_DIRECTIVE */
+#endif /* __ASSEMBLER__ */
+
/*
\f
*/
-#ifdef HAVE_GNU_LD
-
/* Symbol set support macros. */
-# ifdef HAVE_ELF
-
/* Make SYMBOL, which is in the text segment, an element of SET. */
-# define text_set_element(set, symbol) _elf_set_element(set, symbol)
+#define text_set_element(set, symbol) _elf_set_element(set, symbol)
/* Make SYMBOL, which is in the data segment, an element of SET. */
-# define data_set_element(set, symbol) _elf_set_element(set, symbol)
+#define data_set_element(set, symbol) _elf_set_element(set, symbol)
/* Make SYMBOL, which is in the bss segment, an element of SET. */
-# define bss_set_element(set, symbol) _elf_set_element(set, symbol)
+#define bss_set_element(set, symbol) _elf_set_element(set, symbol)
/* These are all done the same way in ELF.
There is a new section created for each set. */
-# ifdef SHARED
+#ifdef SHARED
/* When building a shared library, make the set section writable,
because it will need to be relocated at run time anyway. */
-# define _elf_set_element(set, symbol) \
+# define _elf_set_element(set, symbol) \
static const void *__elf_set_##set##_element_##symbol##__ \
- __attribute__ ((unused, section (#set))) = &(symbol)
-# else
-# define _elf_set_element(set, symbol) \
+ __attribute__ ((used, section (#set))) = &(symbol)
+#else
+# define _elf_set_element(set, symbol) \
static const void *const __elf_set_##set##_element_##symbol##__ \
- __attribute__ ((unused, section (#set))) = &(symbol)
-# endif
+ __attribute__ ((used, 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)
+#define symbol_set_define(set) symbol_set_declare(set)
+
+/* Declare SET for use in this module, if defined in another module.
+ In a shared library, this is always local to that shared object.
+ For static linking, the set might be wholly absent and so we use
+ weak references. */
+#define symbol_set_declare(set) \
+ extern char const __start_##set[] __symbol_set_attribute; \
+ extern char const __stop_##set[] __symbol_set_attribute;
+#ifdef SHARED
+# define __symbol_set_attribute attribute_hidden
+#else
+# define __symbol_set_attribute __attribute__ ((weak))
+#endif
/* Return a pointer (void *const *) to the first element of SET. */
-# define symbol_set_first_element(set) (&__start_##set)
+#define symbol_set_first_element(set) ((void *const *) (&__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_set_end_p(set, ptr) ((ptr) >= (void *const *) &__stop_##set)
+
+#ifdef SHARED
# define symbol_version(real, name, version) \
_symbol_version(real, name, version)
# define default_symbol_version(real, name, version) \
strong_alias(real, name)
#endif
-#if defined HAVE_VISIBILITY_ATTRIBUTE && defined SHARED
+#if defined SHARED || defined LIBC_NONSHARED
# define attribute_hidden __attribute__ ((visibility ("hidden")))
#else
# define attribute_hidden
#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
+#define attribute_tls_model_ie __attribute__ ((tls_model ("initial-exec")))
+
+#define attribute_relro __attribute__ ((section (".data.rel.ro")))
/* The following macros are used for PLT bypassing within libc.so
(and if needed other libraries similarly).
}
libc_hidden_weak (foo)
- If foo is normally just an alias (strong or weak) of some other function,
+ Similarly 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) to some other function,
you should use the normal strong_alias first, then add libc_hidden_def
or libc_hidden_weak:
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
+ #if IS_IN (libc) || IS_IN (rtld)
hidden_proto (foo)
#endif
versioned_symbol (libc, __real_foo, foo, GLIBC_2_1);
libc_hidden_ver (__real_foo, foo) */
-#if defined SHARED && defined DO_VERSIONING
+#if defined SHARED && !defined NO_HIDDEN
# ifndef __ASSEMBLER__
-# ifdef HAVE_BROKEN_VISIBILITY_ATTRIBUTE
-# define __hidden_proto_hiddenattr
-# else
-# define __hidden_proto_hiddenattr attribute_hidden
-# endif
-# ifndef HAVE_BROKEN_ALIAS_ATTRIBUTE
-# define hidden_proto(name) __hidden_proto (name, __GI_##name)
-# else
-# define hidden_proto(name)
-# endif
-# define __hidden_proto(name, internal) \
- __typeof (name) internal; \
- __typeof (name) name __asm__ (__hidden_asmname (#internal)) \
- __hidden_proto_hiddenattr;
+# define __hidden_proto_hiddenattr(attrs...) \
+ __attribute__ ((visibility ("hidden"), ##attrs))
+# define hidden_proto(name, attrs...) \
+ __hidden_proto (name, , __GI_##name, ##attrs)
+# define hidden_tls_proto(name, attrs...) \
+ __hidden_proto (name, __thread, __GI_##name, ##attrs)
+# define __hidden_proto(name, thread, internal, attrs...) \
+ extern thread __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)
-# 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
+# define __hidden_ver1(local, internal, name) \
+ extern __typeof (name) __EI_##name __asm__(__hidden_asmname (#internal)); \
+ extern __typeof (name) __EI_##name \
+ __attribute__((alias (__hidden_asmname (#local))))
+# define hidden_ver(local, name) __hidden_ver1(local, __GI_##name, name);
+# define hidden_data_ver(local, name) hidden_ver(local, name)
+# define hidden_def(name) __hidden_ver1(__GI_##name, name, name);
+# define hidden_data_def(name) hidden_def(name)
+# define hidden_weak(name) \
+ __hidden_ver1(__GI_##name, name, name) __attribute__((weak));
+# define hidden_data_weak(name) hidden_weak(name)
+# define hidden_nolink(name, lib, version) \
+ __hidden_nolink1 (__GI_##name, __EI_##name, name, VERSION_##lib##_##version)
+# define __hidden_nolink1(local, internal, name, version) \
+ __hidden_nolink2 (local, internal, name, version)
+# define __hidden_nolink2(local, internal, name, version) \
+ extern __typeof (name) internal __attribute__ ((alias (#local))); \
+ __hidden_nolink3 (local, internal, #name "@" #version)
+# define __hidden_nolink3(local, internal, vername) \
+ __asm__ (".symver " #internal ", " vername);
# 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.
- hidden_proto and hidden_weak don't make sense for assembly. */
-# define hidden_def(name) strong_alias (name, __GI_##name)
-# define hidden_weak(name) weak_alias (name, __GI_##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 instead 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)
+# define HIDDEN_JUMPTARGET(name) __GI_##name
# endif
#else
-# ifndef __ASSEMBLY__
-# define hidden_proto(name)
-# define hidden_weak(name)
-# endif
+# ifndef __ASSEMBLER__
+# define hidden_proto(name, attrs...)
+# define hidden_tls_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)
+# define hidden_nolink(name, lib, version)
#endif
-#if !defined NOT_IN_libc
-# define libc_hidden_proto(name) hidden_proto (name)
+#if IS_IN (libc)
+# define libc_hidden_proto(name, attrs...) hidden_proto (name, ##attrs)
+# define libc_hidden_tls_proto(name, attrs...) hidden_tls_proto (name, ##attrs)
# define libc_hidden_def(name) hidden_def (name)
# define libc_hidden_weak(name) hidden_weak (name)
+# ifdef LINK_OBSOLETE_RPC
+ /* libc_hidden_nolink_sunrpc should only get used in sunrpc code. */
+# define libc_hidden_nolink_sunrpc(name, version) hidden_def (name)
+# else
+# define libc_hidden_nolink_sunrpc(name, version) hidden_nolink (name, libc, version)
+# endif
# 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)
+# define libc_hidden_proto(name, attrs...)
+# define libc_hidden_tls_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) hidden_proto (name)
+#if IS_IN (rtld)
+# define rtld_hidden_proto(name, attrs...) hidden_proto (name, ##attrs)
+# define rtld_hidden_tls_proto(name, attrs...) hidden_tls_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)
+# define rtld_hidden_proto(name, attrs...)
+# define rtld_hidden_tls_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) hidden_proto (name)
+#if IS_IN (libm)
+# define libm_hidden_proto(name, attrs...) hidden_proto (name, ##attrs)
+# define libm_hidden_tls_proto(name, attrs...) hidden_tls_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)
+# define libm_hidden_proto(name, attrs...)
+# define libm_hidden_tls_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
+
+#if IS_IN (libmvec)
+# define libmvec_hidden_proto(name, attrs...) hidden_proto (name, ##attrs)
+# define libmvec_hidden_tls_proto(name, attrs...) hidden_tls_proto (name, ##attrs)
+# define libmvec_hidden_def(name) hidden_def (name)
+# define libmvec_hidden_weak(name) hidden_weak (name)
+# define libmvec_hidden_ver(local, name) hidden_ver (local, name)
+# define libmvec_hidden_data_def(name) hidden_data_def (name)
+# define libmvec_hidden_data_weak(name) hidden_data_weak (name)
+# define libmvec_hidden_data_ver(local, name) hidden_data_ver (local, name)
+#else
+# define libmvec_hidden_proto(name, attrs...)
+# define libmvec_hidden_tls_proto(name, attrs...)
+# define libmvec_hidden_def(name)
+# define libmvec_hidden_weak(name)
+# define libmvec_hidden_ver(local, name)
+# define libmvec_hidden_data_def(name)
+# define libmvec_hidden_data_weak(name)
+# define libmvec_hidden_data_ver(local, name)
+#endif
+
+#if IS_IN (libresolv)
+# define libresolv_hidden_proto(name, attrs...) hidden_proto (name, ##attrs)
+# define libresolv_hidden_tls_proto(name, attrs...) \
+ hidden_tls_proto (name, ##attrs)
+# define libresolv_hidden_def(name) hidden_def (name)
+# define libresolv_hidden_weak(name) hidden_weak (name)
+# define libresolv_hidden_ver(local, name) hidden_ver (local, name)
+# define libresolv_hidden_data_def(name) hidden_data_def (name)
+# define libresolv_hidden_data_weak(name) hidden_data_weak (name)
+# define libresolv_hidden_data_ver(local, name) hidden_data_ver (local, name)
+#else
+# define libresolv_hidden_proto(name, attrs...)
+# define libresolv_hidden_tls_proto(name, attrs...)
+# define libresolv_hidden_def(name)
+# define libresolv_hidden_weak(name)
+# define libresolv_hidden_ver(local, name)
+# define libresolv_hidden_data_def(name)
+# define libresolv_hidden_data_weak(name)
+# define libresolv_hidden_data_ver(local, name)
+#endif
+
+#if IS_IN (librt)
+# define librt_hidden_proto(name, attrs...) hidden_proto (name, ##attrs)
+# define librt_hidden_tls_proto(name, attrs...) \
+ hidden_tls_proto (name, ##attrs)
+# define librt_hidden_def(name) hidden_def (name)
+# define librt_hidden_weak(name) hidden_weak (name)
+# define librt_hidden_ver(local, name) hidden_ver (local, name)
+# define librt_hidden_data_def(name) hidden_data_def (name)
+# define librt_hidden_data_weak(name) hidden_data_weak (name)
+# define librt_hidden_data_ver(local, name) hidden_data_ver (local, name)
+#else
+# define librt_hidden_proto(name, attrs...)
+# define librt_hidden_tls_proto(name, attrs...)
+# define librt_hidden_def(name)
+# define librt_hidden_weak(name)
+# define librt_hidden_ver(local, name)
+# define librt_hidden_data_def(name)
+# define librt_hidden_data_weak(name)
+# define librt_hidden_data_ver(local, name)
+#endif
+
+#if IS_IN (libdl)
+# define libdl_hidden_proto(name, attrs...) hidden_proto (name, ##attrs)
+# define libdl_hidden_tls_proto(name, attrs...) \
+ hidden_tls_proto (name, ##attrs)
+# define libdl_hidden_def(name) hidden_def (name)
+# define libdl_hidden_weak(name) hidden_weak (name)
+# define libdl_hidden_ver(local, name) hidden_ver (local, name)
+# define libdl_hidden_data_def(name) hidden_data_def (name)
+# define libdl_hidden_data_weak(name) hidden_data_weak (name)
+# define libdl_hidden_data_ver(local, name) hidden_data_ver (local, name)
+#else
+# define libdl_hidden_proto(name, attrs...)
+# define libdl_hidden_tls_proto(name, attrs...)
+# define libdl_hidden_def(name)
+# define libdl_hidden_weak(name)
+# define libdl_hidden_ver(local, name)
+# define libdl_hidden_data_def(name)
+# define libdl_hidden_data_weak(name)
+# define libdl_hidden_data_ver(local, name)
+#endif
+
+#if IS_IN (libnss_files)
+# define libnss_files_hidden_proto(name, attrs...) hidden_proto (name, ##attrs)
+# define libnss_files_hidden_tls_proto(name, attrs...) \
+ hidden_tls_proto (name, ##attrs)
+# define libnss_files_hidden_def(name) hidden_def (name)
+# define libnss_files_hidden_weak(name) hidden_weak (name)
+# define libnss_files_hidden_ver(local, name) hidden_ver (local, name)
+# define libnss_files_hidden_data_def(name) hidden_data_def (name)
+# define libnss_files_hidden_data_weak(name) hidden_data_weak (name)
+# define libnss_files_hidden_data_ver(local, name) hidden_data_ver(local, name)
+#else
+# define libnss_files_hidden_proto(name, attrs...)
+# define libnss_files_hidden_tls_proto(name, attrs...)
+# define libnss_files_hidden_def(name)
+# define libnss_files_hidden_weak(name)
+# define libnss_files_hidden_ver(local, name)
+# define libnss_files_hidden_data_def(name)
+# define libnss_files_hidden_data_weak(name)
+# define libnss_files_hidden_data_ver(local, name)
+#endif
+
+#if IS_IN (libnsl)
+# define libnsl_hidden_proto(name, attrs...) hidden_proto (name, ##attrs)
+# define libnsl_hidden_tls_proto(name, attrs...) \
+ hidden_tls_proto (name, ##attrs)
+# define libnsl_hidden_def(name) hidden_def (name)
+# define libnsl_hidden_weak(name) hidden_weak (name)
+# define libnsl_hidden_ver(local, name) hidden_ver (local, name)
+# define libnsl_hidden_data_def(name) hidden_data_def (name)
+# define libnsl_hidden_data_weak(name) hidden_data_weak (name)
+# define libnsl_hidden_data_ver(local, name) hidden_data_ver (local, name)
+#else
+# define libnsl_hidden_proto(name, attrs...)
+# define libnsl_hidden_tls_proto(name, attrs...)
+# define libnsl_hidden_def(name)
+# define libnsl_hidden_weak(name)
+# define libnsl_hidden_ver(local, name)
+# define libnsl_hidden_data_def(name)
+# define libnsl_hidden_data_weak(name)
+# define libnsl_hidden_data_ver(local, name)
+#endif
+
+#if IS_IN (libnss_nisplus)
+# define libnss_nisplus_hidden_proto(name, attrs...) hidden_proto (name, ##attrs)
+# define libnss_nisplus_hidden_tls_proto(name, attrs...) \
+ hidden_tls_proto (name, ##attrs)
+# define libnss_nisplus_hidden_def(name) hidden_def (name)
+# define libnss_nisplus_hidden_weak(name) hidden_weak (name)
+# define libnss_nisplus_hidden_ver(local, name) hidden_ver (local, name)
+# define libnss_nisplus_hidden_data_def(name) hidden_data_def (name)
+# define libnss_nisplus_hidden_data_weak(name) hidden_data_weak (name)
+# define libnss_nisplus_hidden_data_ver(local, name) hidden_data_ver (local, name)
+#else
+# define libnss_nisplus_hidden_proto(name, attrs...)
+# define libnss_nisplus_hidden_tls_proto(name, attrs...)
+# define libnss_nisplus_hidden_def(name)
+# define libnss_nisplus_hidden_weak(name)
+# define libnss_nisplus_hidden_ver(local, name)
+# define libnss_nisplus_hidden_data_def(name)
+# define libnss_nisplus_hidden_data_weak(name)
+# define libnss_nisplus_hidden_data_ver(local, name)
+#endif
+
+#define libc_hidden_builtin_proto(name, attrs...) libc_hidden_proto (name, ##attrs)
+#define libc_hidden_builtin_def(name) libc_hidden_def (name)
+#define libc_hidden_builtin_weak(name) libc_hidden_weak (name)
+#define libc_hidden_builtin_ver(local, name) libc_hidden_ver (local, name)
+#ifdef __ASSEMBLER__
+# define HIDDEN_BUILTIN_JUMPTARGET(name) HIDDEN_JUMPTARGET(name)
+#endif
+
+#if IS_IN (libutil)
+# define libutil_hidden_proto(name, attrs...) hidden_proto (name, ##attrs)
+# define libutil_hidden_tls_proto(name, attrs...) \
+ hidden_tls_proto (name, ##attrs)
+# define libutil_hidden_def(name) hidden_def (name)
+# define libutil_hidden_weak(name) hidden_weak (name)
+# define libutil_hidden_ver(local, name) hidden_ver (local, name)
+# define libutil_hidden_data_def(name) hidden_data_def (name)
+# define libutil_hidden_data_weak(name) hidden_data_weak (name)
+# define libutil_hidden_data_ver(local, name) hidden_data_ver (local, name)
+#else
+# define libutil_hidden_proto(name, attrs...)
+# define libutil_hidden_tls_proto(name, attrs...)
+# define libutil_hidden_def(name)
+# define libutil_hidden_weak(name)
+# define libutil_hidden_ver(local, name)
+# define libutil_hidden_data_def(name)
+# define libutil_hidden_data_weak(name)
+# define libutil_hidden_data_ver(local, name)
+#endif
+
+/* Get some dirty hacks. */
+#include <symbol-hacks.h>
+
+/* Move compatibility symbols out of the way by placing them all in a
+ special section. */
+#ifndef __ASSEMBLER__
+# define attribute_compat_text_section \
+ __attribute__ ((section (".text.compat")))
+# define attribute_compat_data_section \
+ __attribute__ ((section (".data.compat")))
+#else
+# define compat_text_section .section ".text.compat", "ax";
+# define compat_data_section .section ".data.compat", "aw";
+#endif
+
+/* Marker used for indirection function symbols. */
+#define libc_ifunc(name, expr) \
+ extern void *name##_ifunc (void) __asm__ (#name); \
+ void *name##_ifunc (void) \
+ { \
+ INIT_ARCH (); \
+ __typeof (name) *res = expr; \
+ return res; \
+ } \
+ __asm__ (".type " #name ", %gnu_indirect_function");
+
+/* The body of the function is supposed to use __get_cpu_features
+ which will, if necessary, initialize the data first. */
+#define libm_ifunc(name, expr) \
+ extern void *name##_ifunc (void) __asm__ (#name); \
+ void *name##_ifunc (void) \
+ { \
+ __typeof (name) *res = expr; \
+ return res; \
+ } \
+ __asm__ (".type " #name ", %gnu_indirect_function");
+
+#ifdef HAVE_ASM_SET_DIRECTIVE
+# define libc_ifunc_hidden_def1(local, name) \
+ __asm__ (".globl " #local "\n\t" \
+ ".hidden " #local "\n\t" \
+ ".set " #local ", " #name);
+#else
+# define libc_ifunc_hidden_def1(local, name) \
+ __asm__ (".globl " #local "\n\t" \
+ ".hidden " #local "\n\t" \
+ #local " = " #name);
+#endif
+
+#define libc_ifunc_hidden_def(name) \
+ libc_ifunc_hidden_def1 (__GI_##name, name)
+
+/* Add the compiler optimization to inhibit loop transformation to library
+ calls. This is used to avoid recursive calls in memset and memmove
+ default implementations. */
+#ifdef HAVE_CC_INHIBIT_LOOP_TO_LIBCALL
+# define inhibit_loop_to_libcall \
+ __attribute__ ((__optimize__ ("-fno-tree-loop-distribute-patterns")))
+#else
+# define inhibit_loop_to_libcall
#endif
#endif /* libc-symbols.h */
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