diff options
Diffstat (limited to 'include/libc-symbols.h')
| -rw-r--r-- | include/libc-symbols.h | 130 |
1 files changed, 54 insertions, 76 deletions
diff --git a/include/libc-symbols.h b/include/libc-symbols.h index 4fef305..8ee9407 100644 --- a/include/libc-symbols.h +++ b/include/libc-symbols.h @@ -31,8 +31,6 @@ * 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_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'. @@ -56,7 +54,7 @@ #include <config.h> /* The symbols in all the user (non-_) macros are C symbols. - HAVE_GNU_LD without HAVE_ELF implies a.out. */ + NO HAVE_ELF implies a.out. */ #if defined HAVE_ASM_WEAK_DIRECTIVE || defined HAVE_ASM_WEAKEXT_DIRECTIVE # define HAVE_WEAK_SYMBOLS @@ -220,55 +218,48 @@ /* When a reference to SYMBOL is encountered, the linker will emit a warning message MSG. */ -#ifdef HAVE_GNU_LD -# ifdef HAVE_ELF +#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 */ -# 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) +# endif /* XCOFF */ # define libc_freeres_ptr(decl) decl # define __libc_freeres_fn_section #endif @@ -325,92 +316,79 @@ 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 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 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 /* Have GNU ld. */ + +#endif /* ELF. */ #if DO_VERSIONING # define symbol_version(real, name, version) \ |