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authorUlrich Drepper <drepper@redhat.com>2004-12-22 20:10:10 +0000
committerUlrich Drepper <drepper@redhat.com>2004-12-22 20:10:10 +0000
commita334319f6530564d22e775935d9c91663623a1b4 (patch)
treeb5877475619e4c938e98757d518bb1e9cbead751 /include/libc-symbols.h
parent0ecb606cb6cf65de1d9fc8a919bceb4be476c602 (diff)
downloadglibc-a334319f6530564d22e775935d9c91663623a1b4.tar.gz
(CFLAGS-tst-align.c): Add -mpreferred-stack-boundary=4.
Diffstat (limited to 'include/libc-symbols.h')
-rw-r--r--include/libc-symbols.h233
1 files changed, 145 insertions, 88 deletions
diff --git a/include/libc-symbols.h b/include/libc-symbols.h
index da46f5e804..dcc46cc80f 100644
--- a/include/libc-symbols.h
+++ b/include/libc-symbols.h
@@ -1,7 +1,6 @@
/* 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) 1995-1998,2000-2003,2004 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
@@ -32,6 +31,8 @@
* 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_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'.
@@ -55,7 +56,7 @@
#include <config.h>
/* The symbols in all the user (non-_) macros are C symbols.
- NO HAVE_ELF implies a.out. */
+ HAVE_GNU_LD without HAVE_ELF implies a.out. */
#if defined HAVE_ASM_WEAK_DIRECTIVE || defined HAVE_ASM_WEAKEXT_DIRECTIVE
# define HAVE_WEAK_SYMBOLS
@@ -219,48 +220,55 @@
/* When a reference to SYMBOL is encountered, the linker will emit a
warning message MSG. */
-#ifdef HAVE_ELF
+#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) \
+# 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
+# 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) \
+# 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 /* XCOFF */
+# define libc_freeres_ptr(decl) decl
+# define __libc_freeres_fn_section
+# endif
+#else
+/* We will never be heard; they will all die horribly. */
+# define link_warning(symbol, msg)
# define libc_freeres_ptr(decl) decl
# define __libc_freeres_fn_section
#endif
@@ -271,7 +279,6 @@
/* 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")
@@ -317,79 +324,92 @@ for linking")
*/
+#ifdef HAVE_GNU_LD
+
/* Symbol set support macros. */
-#ifdef HAVE_ELF
+# 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)
+# define symbol_set_end_p(set, ptr) ((ptr) >= (void *const *) &__stop_##set)
-#else /* Not ELF: a.out. */
+# else /* Not ELF: a.out. */
-# ifdef HAVE_XCOFF
+# 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) \
+# 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) \
+# 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 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 /* ELF. */
+#endif /* Have GNU ld. */
#if DO_VERSIONING
# define symbol_version(real, name, version) \
@@ -503,7 +523,7 @@ for linking")
}
libc_hidden_weak (foo)
- Similarly for global data. If references to foo within libc.so should
+ 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)
@@ -518,7 +538,7 @@ for linking")
int foo = INITIAL_FOO_VALUE;
libc_hidden_data_weak (foo)
- If foo is normally just an alias (strong or weak) to some other function,
+ 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:
@@ -562,23 +582,78 @@ for linking")
# 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
-# 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)
+# 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
@@ -687,24 +762,6 @@ for linking")
# define libresolv_hidden_data_ver(local, name)
#endif
-#if defined NOT_IN_libc && defined IS_IN_librt
-# define librt_hidden_proto(name, attrs...) hidden_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_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 defined NOT_IN_libc && defined IS_IN_libdl
# define libdl_hidden_proto(name, attrs...) hidden_proto (name, ##attrs)
# define libdl_hidden_def(name) hidden_def (name)