mirror of
https://sourceware.org/git/glibc.git
synced 2024-09-20 00:19:57 +00:00
8bcdb7e0c5
Mark internal functions with attribute_hidden to allow direct access to
internal functions within libc.so and libc.a without using GOT nor PLT.
Size comparison of libc.so:
On x86-64:
text data bss dec hex
Before: 1728577 20584 17088 1766249 1af369
After : 1728593 20584 17088 1766265 1af379
The only change is __gconv_release_shlib in iconv/gconv_dl.c is inlined
since it is hidden, which increases the code size of gconv_dl.os by 18
bytes.
On i686:
text data bss dec hex
Before: 1869039 11444 11112 1891595 1cdd0b
After : 1868635 11444 11112 1891191 1cdb77
The code size is decreased by avoiding GOT/PLT for hidden functions.
[BZ #18822]
* iconv/gconv_int.h (__gconv_open): Add attribute_hidden.
(__gconv_close): Likewise.
(__gconv): Likewise.
(__gconv_find_transform): Likewise.
(__gconv_lookup_cache): Likewise.
(__gconv_compare_alias_cache): Likewise.
(__gconv_load_cache): Likewise.
(__gconv_get_path): Likewise.
(__gconv_close_transform): Likewise.
(__gconv_release_cache): Likewise.
(__gconv_find_shlib): Likewise.
(__gconv_release_shlib): Likewise.
(__gconv_get_builtin_trans): Likewise.
(__gconv_compare_alias): Likewise.
* include/dlfcn.h (_dlerror_run): Likewise.
* include/stdio.h (__fortify_fail_abort): Likewise.
* include/time.h (__tz_compute): Likewise.
(__strptime_internal): Likewise.
* intl/gettextP.h (_nl_find_domain): Likewise.
(_nl_load_domain): Likewise.
(_nl_find_msg): Likewise.
* intl/plural-exp.h (FREE_EXPRESSION): Likewise.
(EXTRACT_PLURAL_EXPRESSION): Likewise.
* locale/coll-lookup.h (__collidx_table_lookup): Likewise.
* resolv/gai_misc.h (__gai_enqueue_request): Likewise.
(__gai_find_request): Likewise.
(__gai_remove_request): Likewise.
(__gai_notify): Likewise.
(__gai_notify_only): Likewise.
* sysdeps/generic/aio_misc.h (__aio_sigqueue): Likewise.
* sysdeps/generic/ldsodefs.h (_dl_fini): Likewise.
(_dl_non_dynamic_init): Likewise.
(_dl_aux_init): Likewise.
* sysdeps/i386/machine-gmon.h (mcount_internal): Likewise.
* sysdeps/unix/sysv/linux/i386/olddirent.h (__old_getdents64):
Likewise.
* wcsmbs/wcsmbsload.h (__wcsmbs_load_conv): Likewise.
(__wcsmbs_clone_conv): Likewise.
(__wcsmbs_named_conv): Likewise.
138 lines
4.6 KiB
C
138 lines
4.6 KiB
C
#ifndef _DLFCN_H
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#include <dlfcn/dlfcn.h>
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#ifndef _ISOMAC
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#include <link.h> /* For ElfW. */
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#include <stdbool.h>
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/* Internally used flag. */
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#define __RTLD_DLOPEN 0x80000000
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#define __RTLD_SPROF 0x40000000
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#define __RTLD_OPENEXEC 0x20000000
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#define __RTLD_CALLMAP 0x10000000
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#define __RTLD_AUDIT 0x08000000
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#define __RTLD_SECURE 0x04000000 /* Apply additional security checks. */
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#define __RTLD_NOIFUNC 0x02000000 /* Suppress calling ifunc functions. */
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#define __LM_ID_CALLER -2
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#ifdef SHARED
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/* Locally stored program arguments. */
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extern int __dlfcn_argc attribute_hidden;
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extern char **__dlfcn_argv attribute_hidden;
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#else
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/* These variables are defined and initialized in the startup code. */
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extern int __libc_argc attribute_hidden;
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extern char **__libc_argv attribute_hidden;
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# define __dlfcn_argc __libc_argc
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# define __dlfcn_argv __libc_argv
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#endif
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/* Now define the internal interfaces. */
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#define __libc_dlopen(name) \
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__libc_dlopen_mode (name, RTLD_LAZY | __RTLD_DLOPEN)
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extern void *__libc_dlopen_mode (const char *__name, int __mode);
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extern void *__libc_dlsym (void *__map, const char *__name);
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extern int __libc_dlclose (void *__map);
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libc_hidden_proto (__libc_dlopen_mode)
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libc_hidden_proto (__libc_dlsym)
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libc_hidden_proto (__libc_dlclose)
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/* Locate shared object containing the given address. */
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#ifdef ElfW
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extern int _dl_addr (const void *address, Dl_info *info,
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struct link_map **mapp, const ElfW(Sym) **symbolp);
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libc_hidden_proto (_dl_addr)
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#endif
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struct link_map;
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/* Close an object previously opened by _dl_open. */
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extern void _dl_close (void *map) attribute_hidden;
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/* Same as above, but without locking and safety checks for user
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provided map arguments. */
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extern void _dl_close_worker (struct link_map *map, bool force)
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attribute_hidden;
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/* Look up NAME in shared object HANDLE (which may be RTLD_DEFAULT or
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RTLD_NEXT). WHO is the calling function, for RTLD_NEXT. Returns
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the symbol value, which may be NULL. */
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extern void *_dl_sym (void *handle, const char *name, void *who);
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/* Look up version VERSION of symbol NAME in shared object HANDLE
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(which may be RTLD_DEFAULT or RTLD_NEXT). WHO is the calling
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function, for RTLD_NEXT. Returns the symbol value, which may be
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NULL. */
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extern void *_dl_vsym (void *handle, const char *name, const char *version,
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void *who);
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/* Helper function for <dlfcn.h> functions. Runs the OPERATE function via
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_dl_catch_error. Returns zero for success, nonzero for failure; and
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arranges for `dlerror' to return the error details.
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ARGS is passed as argument to OPERATE. */
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extern int _dlerror_run (void (*operate) (void *), void *args)
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attribute_hidden;
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#ifdef SHARED
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# define DL_CALLER_DECL /* Nothing */
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# define DL_CALLER RETURN_ADDRESS (0)
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#else
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# define DL_CALLER_DECL , void *dl_caller
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# define DL_CALLER dl_caller
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#endif
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struct dlfcn_hook
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{
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void *(*dlopen) (const char *file, int mode, void *dl_caller);
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int (*dlclose) (void *handle);
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void *(*dlsym) (void *handle, const char *name, void *dl_caller);
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void *(*dlvsym) (void *handle, const char *name, const char *version,
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void *dl_caller);
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char *(*dlerror) (void);
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int (*dladdr) (const void *address, Dl_info *info);
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int (*dladdr1) (const void *address, Dl_info *info,
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void **extra_info, int flags);
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int (*dlinfo) (void *handle, int request, void *arg, void *dl_caller);
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void *(*dlmopen) (Lmid_t nsid, const char *file, int mode, void *dl_caller);
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void *pad[4];
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};
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extern struct dlfcn_hook *_dlfcn_hook;
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libdl_hidden_proto (_dlfcn_hook)
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extern void *__dlopen (const char *file, int mode DL_CALLER_DECL)
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attribute_hidden;
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extern void *__dlmopen (Lmid_t nsid, const char *file, int mode DL_CALLER_DECL)
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attribute_hidden;
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extern int __dlclose (void *handle)
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attribute_hidden;
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extern void *__dlsym (void *handle, const char *name DL_CALLER_DECL)
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attribute_hidden;
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extern void *__dlvsym (void *handle, const char *name, const char *version
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DL_CALLER_DECL)
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attribute_hidden;
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extern char *__dlerror (void)
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attribute_hidden;
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extern int __dladdr (const void *address, Dl_info *info)
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attribute_hidden;
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extern int __dladdr1 (const void *address, Dl_info *info,
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void **extra_info, int flags)
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attribute_hidden;
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extern int __dlinfo (void *handle, int request, void *arg DL_CALLER_DECL)
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attribute_hidden;
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#ifndef SHARED
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struct link_map;
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extern void * __libc_dlsym_private (struct link_map *map, const char *name)
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attribute_hidden;
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extern void __libc_register_dl_open_hook (struct link_map *map)
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attribute_hidden;
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extern void __libc_register_dlfcn_hook (struct link_map *map)
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attribute_hidden;
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#endif
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#endif
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#endif
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