/* Support macros for making weak and strong aliases for symbols,
and for using symbol sets and linker warnings with GNU ld.
- Copyright (C) 1995-1998,2000-2003,2004,2005,2006
- Free Software Foundation, Inc.
+ Copyright (C) 1995-2015 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.
It should define for us the following symbols:
* HAVE_ASM_SET_DIRECTIVE if we have `.set B, A' instead of `A = B'.
- * ASM_GLOBAL_DIRECTIVE with `.globl' or `.global'.
- * ASM_TYPE_DIRECTIVE_PREFIX with `@' or `#' or whatever for .type,
- or leave it undefined if there is no .type directive.
- * 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.
- NO HAVE_ELF implies a.out. */
-
-#if defined HAVE_ASM_WEAK_DIRECTIVE || defined HAVE_ASM_WEAKEXT_DIRECTIVE
-# define HAVE_WEAK_SYMBOLS
+/* 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. */
+
+#if !defined HAVE_ASM_WEAK_DIRECTIVE && !defined HAVE_ASM_WEAKEXT_DIRECTIVE
+# error "weak symbol support needed"
#endif
#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 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 (weak symbol)
-# define _weak_extern(expr) _Pragma (#expr)
+/* 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")));
-# else
-
-# 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
# ifdef HAVE_ASM_GLOBAL_DOT_NAME
# define strong_alias(original, alias) \
- ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME (alias) ASM_LINE_SEP \
+ .globl C_SYMBOL_NAME (alias) ASM_LINE_SEP \
.set C_SYMBOL_NAME (alias),C_SYMBOL_NAME (original) ASM_LINE_SEP \
- ASM_GLOBAL_DIRECTIVE C_SYMBOL_DOT_NAME (alias) ASM_LINE_SEP \
+ .globl C_SYMBOL_DOT_NAME (alias) ASM_LINE_SEP \
.set C_SYMBOL_DOT_NAME (alias),C_SYMBOL_DOT_NAME (original)
# define strong_data_alias(original, alias) \
- ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME (alias) ASM_LINE_SEP \
+ .globl C_SYMBOL_NAME (alias) ASM_LINE_SEP \
.set C_SYMBOL_NAME (alias),C_SYMBOL_NAME (original)
# else
# define strong_alias(original, alias) \
- ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME (alias) ASM_LINE_SEP \
+ .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)
# endif
# else
# ifdef HAVE_ASM_GLOBAL_DOT_NAME
# define strong_alias(original, alias) \
- ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME (alias) ASM_LINE_SEP \
+ .globl 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 \
+ .globl C_SYMBOL_DOT_NAME (alias) ASM_LINE_SEP \
C_SYMBOL_DOT_NAME (alias) = C_SYMBOL_DOT_NAME (original)
# define strong_data_alias(original, alias) \
- ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME (alias) ASM_LINE_SEP \
+ .globl C_SYMBOL_NAME (alias) ASM_LINE_SEP \
C_SYMBOL_NAME (alias) = C_SYMBOL_NAME (original)
# else
# define strong_alias(original, alias) \
- ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME (alias) ASM_LINE_SEP \
+ .globl C_SYMBOL_NAME (alias) ASM_LINE_SEP \
C_SYMBOL_NAME (alias) = C_SYMBOL_NAME (original)
# define strong_data_alias(original, alias) strong_alias(original, alias)
# endif
# endif
-# ifdef HAVE_WEAK_SYMBOLS
-# ifdef HAVE_ASM_WEAKEXT_DIRECTIVE
-# ifdef HAVE_ASM_GLOBAL_DOT_NAME
-# define weak_alias(original, alias) \
+# ifdef HAVE_ASM_WEAKEXT_DIRECTIVE
+# ifdef HAVE_ASM_GLOBAL_DOT_NAME
+# define weak_alias(original, alias) \
.weakext C_SYMBOL_NAME (alias), C_SYMBOL_NAME (original) ASM_LINE_SEP \
.weakext C_SYMBOL_DOT_NAME (alias), C_SYMBOL_DOT_NAME (original)
-# else
-# define weak_alias(original, alias) \
+# else
+# define weak_alias(original, alias) \
.weakext C_SYMBOL_NAME (alias), C_SYMBOL_NAME (original)
-# endif
-# define weak_extern(symbol) \
+# endif
+# define weak_extern(symbol) \
.weakext C_SYMBOL_NAME (symbol)
-# else /* ! HAVE_ASM_WEAKEXT_DIRECTIVE */
+# else /* ! HAVE_ASM_WEAKEXT_DIRECTIVE */
-# ifdef HAVE_ASM_GLOBAL_DOT_NAME
-# define weak_alias(original, alias) \
+# 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 \
.weak C_SYMBOL_DOT_NAME (alias) ASM_LINE_SEP \
C_SYMBOL_DOT_NAME (alias) = C_SYMBOL_DOT_NAME (original)
-# else
-# define weak_alias(original, alias) \
+# else
+# define weak_alias(original, alias) \
.weak C_SYMBOL_NAME (alias) ASM_LINE_SEP \
C_SYMBOL_NAME (alias) = C_SYMBOL_NAME (original)
-# endif
+# 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 /* ! HAVE_ASM_WEAKEXT_DIRECTIVE */
#endif /* __ASSEMBLER__ */
# 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_ELF
-
/* We want the .gnu.warning.SYMBOL section to be unallocated. */
-# ifdef HAVE_ASM_PREVIOUS_DIRECTIVE
-# define __make_section_unallocated(section_string) \
+#ifdef HAVE_ASM_PREVIOUS_DIRECTIVE
+# 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) \
+#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
+#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 __sec_comment "\"\n\t#\""
-# else
-# define __sec_comment "\n\t#"
-# endif
-# 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__ ((used, section (".gnu.warning." #symbol __sec_comment))) \
= msg;
-# define libc_freeres_ptr(decl) \
+#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 \
+#define __libc_freeres_fn_section \
__attribute__ ((section ("__libc_freeres_fn")))
-#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 */
-# define libc_freeres_ptr(decl) decl
-# define __libc_freeres_fn_section
-#endif
+
#define libc_freeres_fn(name) \
static void name (void) __attribute_used__ __libc_freeres_fn_section; \
text_set_element (__libc_subfreeres, name); \
/* A canned warning for sysdeps/stub functions. */
#define stub_warning(name) \
__make_section_unallocated (".gnu.glibc-stub." #name) \
- link_warning (name, \
- "warning: " #name " is not implemented and will always fail")
+ link_warning (name, #name " is not implemented and will always fail")
/* Warning for linking functions calling dlopen into static binaries. */
#ifdef SHARED
for linking")
#endif
-/* Declare SYMBOL to be TYPE (`function' or `object') and of SIZE bytes,
- when the assembler supports such declarations (such as in ELF).
+/* 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(symbol, type, size) \
- declare_symbol_1 (symbol, type, size)
-#ifdef ASM_TYPE_DIRECTIVE_PREFIX
-# ifdef __ASSEMBLER__
-# define declare_symbol_1(symbol, type, size) \
- .type C_SYMBOL_NAME (symbol), \
- declare_symbol_1_paste (ASM_TYPE_DIRECTIVE_PREFIX, type), size
-# define declare_symbol_1_paste(a, b) declare_symbol_1_paste_1 (a,b)
-# define declare_symbol_1_paste_1(a,b) a##b
-# else /* Not __ASSEMBLER__. */
-# define declare_symbol_1(symbol, type, size) \
- asm (".type " __SYMBOL_PREFIX #symbol ", " \
- declare_symbol_1_stringify (ASM_TYPE_DIRECTIVE_PREFIX) #type \
- "\n\t.size " __SYMBOL_PREFIX #symbol ", " #size);
-# define declare_symbol_1_stringify(x) declare_symbol_1_stringify_1 (x)
-# define declare_symbol_1_stringify_1(x) #x
-# endif /* __ASSEMBLER__ */
-#else
-# define declare_symbol_1(symbol, type, size) /* Nothing. */
-#endif
+#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__ */
/*
/* 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__ ((used, section (#set))) = &(symbol)
-# else
-# define _elf_set_element(set, symbol) \
+#else
+# define _elf_set_element(set, symbol) \
static const void *const __elf_set_##set##_element_##symbol##__ \
__attribute__ ((used, section (#set))) = &(symbol)
-# endif
+#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)
+#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) \
+#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
+#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) ((void *const *) (&__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) >= (void *const *) &__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. */
+#define symbol_set_end_p(set, ptr) ((ptr) >= (void *const *) &__stop_##set)
-#if DO_VERSIONING
+#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 || defined LIBC_NONSHARED)
+#if defined SHARED || defined LIBC_NONSHARED
# define attribute_hidden __attribute__ ((visibility ("hidden")))
#else
# define attribute_hidden
#endif
-#ifdef HAVE_TLS_MODEL_ATTRIBUTE
-# define attribute_tls_model_ie __attribute__ ((tls_model ("initial-exec")))
-#else
-# define attribute_tls_model_ie
-#endif
-
-#ifdef HAVE_Z_RELRO
-# define attribute_relro __attribute__ ((section (".data.rel.ro")))
-#else
-# define attribute_relro
-#endif
+#define attribute_tls_model_ie __attribute__ ((tls_model ("initial-exec")))
-/* 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_relro __attribute__ ((section (".data.rel.ro")))
/* The following macros are used for PLT bypassing within libc.so
(and if needed other libraries similarly).
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 \
- && !defined HAVE_BROKEN_ALIAS_ATTRIBUTE && !defined NO_HIDDEN
+#if defined SHARED && !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...) \
+# 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) name __asm__ (__hidden_asmname (#internal)) \
+ __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_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
#else
# 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_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
+#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, 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_ver(local, name)
#endif
-#if defined NOT_IN_libc && defined IS_IN_rtld
+#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_ver(local, name) hidden_data_ver (local, name)
#else
# 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_ver(local, name)
#endif
-#if defined NOT_IN_libc && defined IS_IN_libm
+#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_ver(local, name) hidden_data_ver (local, name)
#else
# 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_ver(local, name)
#endif
-#if defined NOT_IN_libc && defined IS_IN_libresolv
+#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_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_ver(local, name)
#endif
-#if defined NOT_IN_libc && defined IS_IN_librt
+#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_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_ver(local, name)
#endif
-#if defined NOT_IN_libc && defined IS_IN_libdl
+#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_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_ver(local, name)
#endif
-#if defined NOT_IN_libc && defined IS_IN_libnss_files
+#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_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_ver(local, name)
#endif
-#if defined NOT_IN_libc && defined IS_IN_libnsl
+#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_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_ver(local, name)
#endif
-#if defined NOT_IN_libc && defined IS_IN_libnss_nisplus
+#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_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_ver(local, name)
#endif
-#ifdef HAVE_BUILTIN_REDIRECTION
-# 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
-#else
-# define libc_hidden_builtin_proto(name, attrs...)
-# define libc_hidden_builtin_def(name)
-# define libc_hidden_builtin_weak(name)
-# define libc_hidden_builtin_ver(local, name)
-# ifdef __ASSEMBLER__
-# define HIDDEN_BUILTIN_JUMPTARGET(name) JUMPTARGET(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 defined NOT_IN_libc && defined IS_IN_libutil
+#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_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 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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