diff options
Diffstat (limited to 'include/libc-symbols.h')
| -rw-r--r-- | include/libc-symbols.h | 115 |
1 files changed, 35 insertions, 80 deletions
diff --git a/include/libc-symbols.h b/include/libc-symbols.h index 851efc5c28..e253722c44 100644 --- a/include/libc-symbols.h +++ b/include/libc-symbols.h @@ -1,6 +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) 1995-1998,2000-2006,2008,2009,2011 + Copyright (C) 1995-1998,2000-2006,2008,2009,2011,2012 Free Software Foundation, Inc. This file is part of the GNU C Library. @@ -32,7 +32,6 @@ * 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'. @@ -54,8 +53,7 @@ #include <config.h> -/* The symbols in all the user (non-_) macros are C symbols. - NO HAVE_ELF implies a.out. */ +/* The symbols in all the user (non-_) macros are C symbols. */ #if defined HAVE_ASM_WEAK_DIRECTIVE || defined HAVE_ASM_WEAKEXT_DIRECTIVE # define HAVE_WEAK_SYMBOLS @@ -222,51 +220,35 @@ /* 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); \ @@ -337,77 +319,50 @@ for linking") /* 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 # define symbol_version(real, name, version) \ |