]>
git.ipfire.org Git - thirdparty/glibc.git/blob - include/libc-symbols.h
1 /* Support macros for making weak and strong aliases for symbols,
2 and for using symbol sets and linker warnings with GNU ld.
3 Copyright (C) 1995-1998,2000-2006,2008,2009,2011
4 Free Software Foundation, Inc.
5 This file is part of the GNU C Library.
7 The GNU C Library is free software; you can redistribute it and/or
8 modify it under the terms of the GNU Lesser General Public
9 License as published by the Free Software Foundation; either
10 version 2.1 of the License, or (at your option) any later version.
12 The GNU C Library is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 Lesser General Public License for more details.
17 You should have received a copy of the GNU Lesser General Public
18 License along with the GNU C Library; if not, write to the Free
19 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
22 #ifndef _LIBC_SYMBOLS_H
23 #define _LIBC_SYMBOLS_H 1
25 /* This file's macros are included implicitly in the compilation of every
26 file in the C library by -imacros.
28 We include config.h which is generated by configure.
29 It should define for us the following symbols:
31 * HAVE_ASM_SET_DIRECTIVE if we have `.set B, A' instead of `A = B'.
32 * ASM_GLOBAL_DIRECTIVE with `.globl' or `.global'.
33 * ASM_TYPE_DIRECTIVE_PREFIX with `@' or `#' or whatever for .type,
34 or leave it undefined if there is no .type directive.
35 * HAVE_ELF if using ELF, which supports weak symbols using `.weak'.
36 * HAVE_ASM_WEAK_DIRECTIVE if we have weak symbols using `.weak'.
37 * HAVE_ASM_WEAKEXT_DIRECTIVE if we have weak symbols using `.weakext'.
41 /* This is defined for the compilation of all C library code. features.h
42 tests this to avoid inclusion of stubs.h while compiling the library,
43 before stubs.h has been generated. Some library code that is shared
44 with other packages also tests this symbol to see if it is being
45 compiled as part of the C library. We must define this before including
46 config.h, because it makes some definitions conditional on whether libc
47 itself is being compiled, or just some generator program. */
50 /* Enable declarations of GNU extensions, since we are compiling them. */
52 /* And we also need the data for the reentrant functions. */
57 /* The symbols in all the user (non-_) macros are C symbols.
58 NO HAVE_ELF implies a.out. */
60 #if defined HAVE_ASM_WEAK_DIRECTIVE || defined HAVE_ASM_WEAKEXT_DIRECTIVE
61 # define HAVE_WEAK_SYMBOLS
64 #ifndef __SYMBOL_PREFIX
65 # ifdef NO_UNDERSCORES
66 # define __SYMBOL_PREFIX
68 # define __SYMBOL_PREFIX "_"
73 # ifdef NO_UNDERSCORES
74 # define C_SYMBOL_NAME(name) name
76 # define C_SYMBOL_NAME(name) _##name
81 # define ASM_LINE_SEP ;
84 #ifdef HAVE_ASM_GLOBAL_DOT_NAME
85 # ifndef C_SYMBOL_DOT_NAME
86 # if defined __GNUC__ && defined __GNUC_MINOR__ \
87 && (__GNUC__ << 16) + __GNUC_MINOR__ >= (3 << 16) + 1
88 # define C_SYMBOL_DOT_NAME(name) .name
90 # define C_SYMBOL_DOT_NAME(name) .##name
96 /* GCC understands weak symbols and aliases; use its interface where
97 possible, instead of embedded assembly language. */
99 /* Define ALIASNAME as a strong alias for NAME. */
100 # define strong_alias(name, aliasname) _strong_alias(name, aliasname)
101 # define _strong_alias(name, aliasname) \
102 extern __typeof (name) aliasname __attribute__ ((alias (#name)));
104 /* This comes between the return type and function name in
105 a function definition to make that definition weak. */
106 # define weak_function __attribute__ ((weak))
107 # define weak_const_function __attribute__ ((weak, __const__))
109 # ifdef HAVE_WEAK_SYMBOLS
111 /* Define ALIASNAME as a weak alias for NAME.
112 If weak aliases are not available, this defines a strong alias. */
113 # define weak_alias(name, aliasname) _weak_alias (name, aliasname)
114 # define _weak_alias(name, aliasname) \
115 extern __typeof (name) aliasname __attribute__ ((weak, alias (#name)));
117 /* Same as WEAK_ALIAS, but mark symbol as hidden. */
118 # define weak_hidden_alias(name, aliasname) \
119 _weak_hidden_alias (name, aliasname)
120 # define _weak_hidden_alias(name, aliasname) \
121 extern __typeof (name) aliasname \
122 __attribute__ ((weak, alias (#name), __visibility__ ("hidden")));
124 /* Declare SYMBOL as weak undefined symbol (resolved to 0 if not defined). */
125 # define weak_extern(symbol) _weak_extern (weak symbol)
126 # define _weak_extern(expr) _Pragma (#expr)
130 # define weak_alias(name, aliasname) strong_alias(name, aliasname)
131 # define weak_hidden_alias(name, aliasname) strong_alias(name, aliasname)
132 # define weak_extern(symbol) /* Nothing. */
136 #else /* __ASSEMBLER__ */
138 # ifdef HAVE_ASM_SET_DIRECTIVE
139 # ifdef HAVE_ASM_GLOBAL_DOT_NAME
140 # define strong_alias(original, alias) \
141 ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME (alias) ASM_LINE_SEP \
142 .set C_SYMBOL_NAME (alias),C_SYMBOL_NAME (original) ASM_LINE_SEP \
143 ASM_GLOBAL_DIRECTIVE C_SYMBOL_DOT_NAME (alias) ASM_LINE_SEP \
144 .set C_SYMBOL_DOT_NAME (alias),C_SYMBOL_DOT_NAME (original)
145 # define strong_data_alias(original, alias) \
146 ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME (alias) ASM_LINE_SEP \
147 .set C_SYMBOL_NAME (alias),C_SYMBOL_NAME (original)
149 # define strong_alias(original, alias) \
150 ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME (alias) ASM_LINE_SEP \
151 .set C_SYMBOL_NAME (alias),C_SYMBOL_NAME (original)
152 # define strong_data_alias(original, alias) strong_alias(original, alias)
155 # ifdef HAVE_ASM_GLOBAL_DOT_NAME
156 # define strong_alias(original, alias) \
157 ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME (alias) ASM_LINE_SEP \
158 C_SYMBOL_NAME (alias) = C_SYMBOL_NAME (original) ASM_LINE_SEP \
159 ASM_GLOBAL_DIRECTIVE C_SYMBOL_DOT_NAME (alias) ASM_LINE_SEP \
160 C_SYMBOL_DOT_NAME (alias) = C_SYMBOL_DOT_NAME (original)
161 # define strong_data_alias(original, alias) \
162 ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME (alias) ASM_LINE_SEP \
163 C_SYMBOL_NAME (alias) = C_SYMBOL_NAME (original)
165 # define strong_alias(original, alias) \
166 ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME (alias) ASM_LINE_SEP \
167 C_SYMBOL_NAME (alias) = C_SYMBOL_NAME (original)
168 # define strong_data_alias(original, alias) strong_alias(original, alias)
172 # ifdef HAVE_WEAK_SYMBOLS
173 # ifdef HAVE_ASM_WEAKEXT_DIRECTIVE
174 # ifdef HAVE_ASM_GLOBAL_DOT_NAME
175 # define weak_alias(original, alias) \
176 .weakext C_SYMBOL_NAME (alias), C_SYMBOL_NAME (original) ASM_LINE_SEP \
177 .weakext C_SYMBOL_DOT_NAME (alias), C_SYMBOL_DOT_NAME (original)
179 # define weak_alias(original, alias) \
180 .weakext C_SYMBOL_NAME (alias), C_SYMBOL_NAME (original)
182 # define weak_extern(symbol) \
183 .weakext C_SYMBOL_NAME (symbol)
185 # else /* ! HAVE_ASM_WEAKEXT_DIRECTIVE */
187 # ifdef HAVE_ASM_GLOBAL_DOT_NAME
188 # define weak_alias(original, alias) \
189 .weak C_SYMBOL_NAME (alias) ASM_LINE_SEP \
190 C_SYMBOL_NAME (alias) = C_SYMBOL_NAME (original) ASM_LINE_SEP \
191 .weak C_SYMBOL_DOT_NAME (alias) ASM_LINE_SEP \
192 C_SYMBOL_DOT_NAME (alias) = C_SYMBOL_DOT_NAME (original)
194 # define weak_alias(original, alias) \
195 .weak C_SYMBOL_NAME (alias) ASM_LINE_SEP \
196 C_SYMBOL_NAME (alias) = C_SYMBOL_NAME (original)
199 # define weak_extern(symbol) \
200 .weak C_SYMBOL_NAME (symbol)
202 # endif /* ! HAVE_ASM_WEAKEXT_DIRECTIVE */
204 # else /* ! HAVE_WEAK_SYMBOLS */
206 # define weak_alias(original, alias) strong_alias(original, alias)
207 # define weak_extern(symbol) /* Nothing */
208 # endif /* ! HAVE_WEAK_SYMBOLS */
210 #endif /* __ASSEMBLER__ */
212 /* On some platforms we can make internal function calls (i.e., calls of
213 functions not exported) a bit faster by using a different calling
215 #ifndef internal_function
216 # define internal_function /* empty */
219 /* Determine the return address. */
220 #define RETURN_ADDRESS(nr) \
221 __builtin_extract_return_addr (__builtin_return_address (nr))
223 /* When a reference to SYMBOL is encountered, the linker will emit a
224 warning message MSG. */
227 /* We want the .gnu.warning.SYMBOL section to be unallocated. */
228 # ifdef HAVE_ASM_PREVIOUS_DIRECTIVE
229 # define __make_section_unallocated(section_string) \
230 asm (".section " section_string "\n\t.previous");
231 # elif defined HAVE_ASM_POPSECTION_DIRECTIVE
232 # define __make_section_unallocated(section_string) \
233 asm (".pushsection " section_string "\n\t.popsection");
235 # define __make_section_unallocated(section_string)
238 /* Tacking on "\n\t#" to the section name makes gcc put it's bogus
239 section attributes on what looks like a comment to the assembler. */
240 # ifdef HAVE_SECTION_QUOTES
241 # define __sec_comment "\"\n\t#\""
243 # define __sec_comment "\n\t#"
245 # define link_warning(symbol, msg) \
246 __make_section_unallocated (".gnu.warning." #symbol) \
247 static const char __evoke_link_warning_##symbol[] \
248 __attribute__ ((used, section (".gnu.warning." #symbol __sec_comment))) \
250 # define libc_freeres_ptr(decl) \
251 __make_section_unallocated ("__libc_freeres_ptrs, \"aw\", %nobits") \
252 decl __attribute__ ((section ("__libc_freeres_ptrs" __sec_comment)))
253 # define __libc_freeres_fn_section \
254 __attribute__ ((section ("__libc_freeres_fn")))
255 #else /* Not ELF: a.out */
257 /* XCOFF does not support .stabs.
258 The native aix linker will remove the .stab and .stabstr sections
259 The gnu linker will have a fatal error if there is a relocation for
260 symbol in the .stab section. Silently disable this macro. */
261 # define link_warning(symbol, msg)
263 # define link_warning(symbol, msg) \
264 asm (".stabs \"" msg "\",30,0,0,0\n\t" \
265 ".stabs \"" __SYMBOL_PREFIX #symbol "\",1,0,0,0\n");
267 # define libc_freeres_ptr(decl) decl
268 # define __libc_freeres_fn_section
270 #define libc_freeres_fn(name) \
271 static void name (void) __attribute_used__ __libc_freeres_fn_section; \
272 text_set_element (__libc_subfreeres, name); \
273 static void name (void)
275 /* A canned warning for sysdeps/stub functions. */
276 #define stub_warning(name) \
277 __make_section_unallocated (".gnu.glibc-stub." #name) \
278 link_warning (name, \
279 "warning: " #name " is not implemented and will always fail")
281 /* Warning for linking functions calling dlopen into static binaries. */
283 #define static_link_warning(name)
285 #define static_link_warning(name) static_link_warning1(name)
286 #define static_link_warning1(name) \
287 link_warning(name, "Using '" #name "' in statically linked applications \
288 requires at runtime the shared libraries from the glibc version used \
292 /* Declare SYMBOL to be TYPE (`function' or `object') of SIZE bytes
293 alias to ORIGINAL, when the assembler supports such declarations
295 This is only necessary when defining something in assembly, or playing
296 funny alias games where the size should be other than what the compiler
298 #define declare_symbol_alias(symbol, original, type, size) \
299 declare_symbol_alias_1 (symbol, original, type, size)
300 #ifdef ASM_TYPE_DIRECTIVE_PREFIX
301 # ifdef __ASSEMBLER__
302 # define declare_symbol_alias_1(symbol, original, type, size) \
303 strong_alias (original, symbol); \
304 .type C_SYMBOL_NAME (symbol), \
305 declare_symbol_alias_1_paste (ASM_TYPE_DIRECTIVE_PREFIX, type); \
306 .size C_SYMBOL_NAME (symbol), size
307 # define declare_symbol_alias_1_paste(a, b) \
308 declare_symbol_alias_1_paste_1 (a,b)
309 # define declare_symbol_alias_1_paste_1(a,b) a##b
310 # else /* Not __ASSEMBLER__. */
311 # define declare_symbol_alias_1(symbol, original, type, size) \
312 asm (declare_symbol_alias_1_stringify (ASM_GLOBAL_DIRECTIVE) \
313 " " __SYMBOL_PREFIX #symbol \
314 "\n\t" declare_symbol_alias_1_alias (symbol, original) \
315 "\n\t.type " __SYMBOL_PREFIX #symbol ", " \
316 declare_symbol_alias_1_stringify (ASM_TYPE_DIRECTIVE_PREFIX) #type \
317 "\n\t.size " __SYMBOL_PREFIX #symbol ", " #size);
318 # define declare_symbol_alias_1_stringify(x) \
319 declare_symbol_alias_1_stringify_1 (x)
320 # define declare_symbol_alias_1_stringify_1(x) #x
321 # ifdef HAVE_ASM_SET_DIRECTIVE
322 # define declare_symbol_alias_1_alias(symbol, original) \
323 ".set " __SYMBOL_PREFIX #symbol ", " __SYMBOL_PREFIX #original
325 # define declare_symbol_alias_1_alias(symbol, original) \
326 __SYMBOL_PREFIX #symbol " = " __SYMBOL_PREFIX #original
327 # endif /* HAVE_ASM_SET_DIRECTIVE */
328 # endif /* __ASSEMBLER__ */
330 # define declare_symbol_1(symbol, type, size) /* Nothing. */
338 /* Symbol set support macros. */
342 /* Make SYMBOL, which is in the text segment, an element of SET. */
343 # define text_set_element(set, symbol) _elf_set_element(set, symbol)
344 /* Make SYMBOL, which is in the data segment, an element of SET. */
345 # define data_set_element(set, symbol) _elf_set_element(set, symbol)
346 /* Make SYMBOL, which is in the bss segment, an element of SET. */
347 # define bss_set_element(set, symbol) _elf_set_element(set, symbol)
349 /* These are all done the same way in ELF.
350 There is a new section created for each set. */
352 /* When building a shared library, make the set section writable,
353 because it will need to be relocated at run time anyway. */
354 # define _elf_set_element(set, symbol) \
355 static const void *__elf_set_##set##_element_##symbol##__ \
356 __attribute__ ((used, section (#set))) = &(symbol)
358 # define _elf_set_element(set, symbol) \
359 static const void *const __elf_set_##set##_element_##symbol##__ \
360 __attribute__ ((used, section (#set))) = &(symbol)
363 /* Define SET as a symbol set. This may be required (it is in a.out) to
364 be able to use the set's contents. */
365 # define symbol_set_define(set) symbol_set_declare(set)
367 /* Declare SET for use in this module, if defined in another module.
368 In a shared library, this is always local to that shared object.
369 For static linking, the set might be wholly absent and so we use
371 # define symbol_set_declare(set) \
372 extern char const __start_##set[] __symbol_set_attribute; \
373 extern char const __stop_##set[] __symbol_set_attribute;
375 # define __symbol_set_attribute attribute_hidden
377 # define __symbol_set_attribute __attribute__ ((weak))
380 /* Return a pointer (void *const *) to the first element of SET. */
381 # define symbol_set_first_element(set) ((void *const *) (&__start_##set))
383 /* Return true iff PTR (a void *const *) has been incremented
384 past the last element in SET. */
385 # define symbol_set_end_p(set, ptr) ((ptr) >= (void *const *) &__stop_##set)
387 #else /* Not ELF: a.out. */
390 /* XCOFF does not support .stabs.
391 The native aix linker will remove the .stab and .stabstr sections
392 The gnu linker will have a fatal error if there is a relocation for
393 symbol in the .stab section. Silently disable these macros. */
394 # define text_set_element(set, symbol)
395 # define data_set_element(set, symbol)
396 # define bss_set_element(set, symbol)
398 # define text_set_element(set, symbol) \
399 asm (".stabs \"" __SYMBOL_PREFIX #set "\",23,0,0," __SYMBOL_PREFIX #symbol)
400 # define data_set_element(set, symbol) \
401 asm (".stabs \"" __SYMBOL_PREFIX #set "\",25,0,0," __SYMBOL_PREFIX #symbol)
402 # define bss_set_element(set, symbol) ?error Must use initialized data.
404 # define symbol_set_define(set) void *const (set)[1];
405 # define symbol_set_declare(set) extern void *const (set)[1];
407 # define symbol_set_first_element(set) &(set)[1]
408 # define symbol_set_end_p(set, ptr) (*(ptr) == 0)
413 # define symbol_version(real, name, version) \
414 _symbol_version(real, name, version)
415 # define default_symbol_version(real, name, version) \
416 _default_symbol_version(real, name, version)
417 # ifdef __ASSEMBLER__
418 # ifdef HAVE_ASM_GLOBAL_DOT_NAME
419 # define _symbol_version(real, name, version) \
420 .symver real, name##@##version ASM_LINE_SEP \
421 .symver C_SYMBOL_DOT_NAME(real), C_SYMBOL_DOT_NAME(name##@##version)
422 # define _default_symbol_version(real, name, version) \
423 .symver real, name##@##@##version ASM_LINE_SEP \
424 .symver C_SYMBOL_DOT_NAME(real), C_SYMBOL_DOT_NAME(name##@##@##version)
426 # define _symbol_version(real, name, version) \
427 .symver real, name##@##version
428 # define _default_symbol_version(real, name, version) \
429 .symver real, name##@##@##version
432 # ifdef HAVE_ASM_GLOBAL_DOT_NAME
433 # define _symbol_version(real, name, version) \
434 __asm__ (".symver " #real "," #name "@" #version "\n\t" \
435 ".symver ." #real ",." #name "@" #version)
436 # define _default_symbol_version(real, name, version) \
437 __asm__ (".symver " #real "," #name "@@" #version "\n\t" \
438 ".symver ." #real ",." #name "@@" #version)
440 # define _symbol_version(real, name, version) \
441 __asm__ (".symver " #real "," #name "@" #version)
442 # define _default_symbol_version(real, name, version) \
443 __asm__ (".symver " #real "," #name "@@" #version)
447 # define symbol_version(real, name, version)
448 # define default_symbol_version(real, name, version) \
449 strong_alias(real, name)
452 #if defined SHARED || defined LIBC_NONSHARED
453 # define attribute_hidden __attribute__ ((visibility ("hidden")))
455 # define attribute_hidden
458 #define attribute_tls_model_ie __attribute__ ((tls_model ("initial-exec")))
460 #define attribute_relro __attribute__ ((section (".data.rel.ro")))
462 /* Handling on non-exported internal names. We have to do this only
465 # define INTUSE(name) name##_internal
466 # define INTDEF(name) strong_alias (name, name##_internal)
467 # define INTVARDEF(name) \
468 _INTVARDEF (name, name##_internal)
469 # define _INTVARDEF(name, aliasname) \
470 extern __typeof (name) aliasname __attribute__ ((alias (#name), \
471 visibility ("hidden")));
472 # define INTDEF2(name, newname) strong_alias (name, newname##_internal)
473 # define INTVARDEF2(name, newname) _INTVARDEF (name, newname##_internal)
475 # define INTUSE(name) name
476 # define INTDEF(name)
477 # define INTVARDEF(name)
478 # define INTDEF2(name, newname)
479 # define INTVARDEF2(name, newname)
482 /* The following macros are used for PLT bypassing within libc.so
483 (and if needed other libraries similarly).
484 First of all, you need to have the function prototyped somewhere,
489 If calls to foo within libc.so should always go to foo defined in libc.so,
490 then in include/foo.h you add:
492 libc_hidden_proto (foo)
494 line and after the foo function definition:
500 libc_hidden_def (foo)
508 libc_hidden_weak (foo)
510 Similarly for global data. If references to foo within libc.so should
511 always go to foo defined in libc.so, then in include/foo.h you add:
513 libc_hidden_proto (foo)
515 line and after foo's definition:
517 int foo = INITIAL_FOO_VALUE;
518 libc_hidden_data_def (foo)
522 int foo = INITIAL_FOO_VALUE;
523 libc_hidden_data_weak (foo)
525 If foo is normally just an alias (strong or weak) to some other function,
526 you should use the normal strong_alias first, then add libc_hidden_def
533 strong_alias (baz, foo)
534 libc_hidden_weak (foo)
536 If the function should be internal to multiple objects, say ld.so and
537 libc.so, the best way is to use:
539 #if !defined NOT_IN_libc || defined IS_IN_rtld
543 in include/foo.h and the normal macros at all function definitions
544 depending on what DSO they belong to.
546 If versioned_symbol macro is used to define foo,
547 libc_hidden_ver macro should be used, as in:
549 int __real_foo (int __bar)
553 versioned_symbol (libc, __real_foo, foo, GLIBC_2_1);
554 libc_hidden_ver (__real_foo, foo) */
556 #if defined SHARED && defined DO_VERSIONING && !defined NO_HIDDEN
557 # ifndef __ASSEMBLER__
558 # define __hidden_proto_hiddenattr(attrs...) \
559 __attribute__ ((visibility ("hidden"), ##attrs))
560 # define hidden_proto(name, attrs...) \
561 __hidden_proto (name, __GI_##name, ##attrs)
562 # define __hidden_proto(name, internal, attrs...) \
563 extern __typeof (name) name __asm__ (__hidden_asmname (#internal)) \
564 __hidden_proto_hiddenattr (attrs);
565 # define __hidden_asmname(name) \
566 __hidden_asmname1 (__USER_LABEL_PREFIX__, name)
567 # define __hidden_asmname1(prefix, name) __hidden_asmname2(prefix, name)
568 # define __hidden_asmname2(prefix, name) #prefix name
569 # define __hidden_ver1(local, internal, name) \
570 extern __typeof (name) __EI_##name __asm__(__hidden_asmname (#internal)); \
571 extern __typeof (name) __EI_##name \
572 __attribute__((alias (__hidden_asmname (#local))))
573 # define hidden_ver(local, name) __hidden_ver1(local, __GI_##name, name);
574 # define hidden_data_ver(local, name) hidden_ver(local, name)
575 # define hidden_def(name) __hidden_ver1(__GI_##name, name, name);
576 # define hidden_data_def(name) hidden_def(name)
577 # define hidden_weak(name) \
578 __hidden_ver1(__GI_##name, name, name) __attribute__((weak));
579 # define hidden_data_weak(name) hidden_weak(name)
580 # define hidden_nolink(name, lib, version) \
581 __hidden_nolink1 (__GI_##name, __EI_##name, name, VERSION_##lib##_##version)
582 # define __hidden_nolink1(local, internal, name, version) \
583 __hidden_nolink2 (local, internal, name, version)
584 # define __hidden_nolink2(local, internal, name, version) \
585 extern __typeof (name) internal __attribute__ ((alias (#local))); \
586 __hidden_nolink3 (local, internal, #name "@" #version)
587 # define __hidden_nolink3(local, internal, vername) \
588 __asm__ (".symver " #internal ", " vername);
590 /* For assembly, we need to do the opposite of what we do in C:
591 in assembly gcc __REDIRECT stuff is not in place, so functions
592 are defined by its normal name and we need to create the
593 __GI_* alias to it, in C __REDIRECT causes the function definition
594 to use __GI_* name and we need to add alias to the real name.
595 There is no reason to use hidden_weak over hidden_def in assembly,
596 but we provide it for consistency with the C usage.
597 hidden_proto doesn't make sense for assembly but the equivalent
598 is to call via the HIDDEN_JUMPTARGET macro instead of JUMPTARGET. */
599 # define hidden_def(name) strong_alias (name, __GI_##name)
600 # define hidden_weak(name) hidden_def (name)
601 # define hidden_ver(local, name) strong_alias (local, __GI_##name)
602 # define hidden_data_def(name) strong_data_alias (name, __GI_##name)
603 # define hidden_data_weak(name) hidden_data_def (name)
604 # define hidden_data_ver(local, name) strong_data_alias (local, __GI_##name)
605 # ifdef HAVE_ASM_GLOBAL_DOT_NAME
606 # define HIDDEN_JUMPTARGET(name) .__GI_##name
608 # define HIDDEN_JUMPTARGET(name) __GI_##name
612 # ifndef __ASSEMBLER__
613 # define hidden_proto(name, attrs...)
615 # define HIDDEN_JUMPTARGET(name) JUMPTARGET(name)
616 # endif /* Not __ASSEMBLER__ */
617 # define hidden_weak(name)
618 # define hidden_def(name)
619 # define hidden_ver(local, name)
620 # define hidden_data_weak(name)
621 # define hidden_data_def(name)
622 # define hidden_data_ver(local, name)
625 #if !defined NOT_IN_libc
626 # define libc_hidden_proto(name, attrs...) hidden_proto (name, ##attrs)
627 # define libc_hidden_def(name) hidden_def (name)
628 # define libc_hidden_weak(name) hidden_weak (name)
629 # define libc_hidden_nolink(name, version) hidden_nolink (name, libc, version)
630 # define libc_hidden_ver(local, name) hidden_ver (local, name)
631 # define libc_hidden_data_def(name) hidden_data_def (name)
632 # define libc_hidden_data_weak(name) hidden_data_weak (name)
633 # define libc_hidden_data_ver(local, name) hidden_data_ver (local, name)
635 # define libc_hidden_proto(name, attrs...)
636 # define libc_hidden_def(name)
637 # define libc_hidden_weak(name)
638 # define libc_hidden_ver(local, name)
639 # define libc_hidden_data_def(name)
640 # define libc_hidden_data_weak(name)
641 # define libc_hidden_data_ver(local, name)
644 #if defined NOT_IN_libc && defined IS_IN_rtld
645 # define rtld_hidden_proto(name, attrs...) hidden_proto (name, ##attrs)
646 # define rtld_hidden_def(name) hidden_def (name)
647 # define rtld_hidden_weak(name) hidden_weak (name)
648 # define rtld_hidden_ver(local, name) hidden_ver (local, name)
649 # define rtld_hidden_data_def(name) hidden_data_def (name)
650 # define rtld_hidden_data_weak(name) hidden_data_weak (name)
651 # define rtld_hidden_data_ver(local, name) hidden_data_ver (local, name)
653 # define rtld_hidden_proto(name, attrs...)
654 # define rtld_hidden_def(name)
655 # define rtld_hidden_weak(name)
656 # define rtld_hidden_ver(local, name)
657 # define rtld_hidden_data_def(name)
658 # define rtld_hidden_data_weak(name)
659 # define rtld_hidden_data_ver(local, name)
662 #if defined NOT_IN_libc && defined IS_IN_libm
663 # define libm_hidden_proto(name, attrs...) hidden_proto (name, ##attrs)
664 # define libm_hidden_def(name) hidden_def (name)
665 # define libm_hidden_weak(name) hidden_weak (name)
666 # define libm_hidden_ver(local, name) hidden_ver (local, name)
667 # define libm_hidden_data_def(name) hidden_data_def (name)
668 # define libm_hidden_data_weak(name) hidden_data_weak (name)
669 # define libm_hidden_data_ver(local, name) hidden_data_ver (local, name)
671 # define libm_hidden_proto(name, attrs...)
672 # define libm_hidden_def(name)
673 # define libm_hidden_weak(name)
674 # define libm_hidden_ver(local, name)
675 # define libm_hidden_data_def(name)
676 # define libm_hidden_data_weak(name)
677 # define libm_hidden_data_ver(local, name)
680 #if defined NOT_IN_libc && defined IS_IN_libresolv
681 # define libresolv_hidden_proto(name, attrs...) hidden_proto (name, ##attrs)
682 # define libresolv_hidden_def(name) hidden_def (name)
683 # define libresolv_hidden_weak(name) hidden_weak (name)
684 # define libresolv_hidden_ver(local, name) hidden_ver (local, name)
685 # define libresolv_hidden_data_def(name) hidden_data_def (name)
686 # define libresolv_hidden_data_weak(name) hidden_data_weak (name)
687 # define libresolv_hidden_data_ver(local, name) hidden_data_ver (local, name)
689 # define libresolv_hidden_proto(name, attrs...)
690 # define libresolv_hidden_def(name)
691 # define libresolv_hidden_weak(name)
692 # define libresolv_hidden_ver(local, name)
693 # define libresolv_hidden_data_def(name)
694 # define libresolv_hidden_data_weak(name)
695 # define libresolv_hidden_data_ver(local, name)
698 #if defined NOT_IN_libc && defined IS_IN_librt
699 # define librt_hidden_proto(name, attrs...) hidden_proto (name, ##attrs)
700 # define librt_hidden_def(name) hidden_def (name)
701 # define librt_hidden_weak(name) hidden_weak (name)
702 # define librt_hidden_ver(local, name) hidden_ver (local, name)
703 # define librt_hidden_data_def(name) hidden_data_def (name)
704 # define librt_hidden_data_weak(name) hidden_data_weak (name)
705 # define librt_hidden_data_ver(local, name) hidden_data_ver (local, name)
707 # define librt_hidden_proto(name, attrs...)
708 # define librt_hidden_def(name)
709 # define librt_hidden_weak(name)
710 # define librt_hidden_ver(local, name)
711 # define librt_hidden_data_def(name)
712 # define librt_hidden_data_weak(name)
713 # define librt_hidden_data_ver(local, name)
716 #if defined NOT_IN_libc && defined IS_IN_libdl
717 # define libdl_hidden_proto(name, attrs...) hidden_proto (name, ##attrs)
718 # define libdl_hidden_def(name) hidden_def (name)
719 # define libdl_hidden_weak(name) hidden_weak (name)
720 # define libdl_hidden_ver(local, name) hidden_ver (local, name)
721 # define libdl_hidden_data_def(name) hidden_data_def (name)
722 # define libdl_hidden_data_weak(name) hidden_data_weak (name)
723 # define libdl_hidden_data_ver(local, name) hidden_data_ver (local, name)
725 # define libdl_hidden_proto(name, attrs...)
726 # define libdl_hidden_def(name)
727 # define libdl_hidden_weak(name)
728 # define libdl_hidden_ver(local, name)
729 # define libdl_hidden_data_def(name)
730 # define libdl_hidden_data_weak(name)
731 # define libdl_hidden_data_ver(local, name)
734 #if defined NOT_IN_libc && defined IS_IN_libnss_files
735 # define libnss_files_hidden_proto(name, attrs...) hidden_proto (name, ##attrs)
736 # define libnss_files_hidden_def(name) hidden_def (name)
737 # define libnss_files_hidden_weak(name) hidden_weak (name)
738 # define libnss_files_hidden_ver(local, name) hidden_ver (local, name)
739 # define libnss_files_hidden_data_def(name) hidden_data_def (name)
740 # define libnss_files_hidden_data_weak(name) hidden_data_weak (name)
741 # define libnss_files_hidden_data_ver(local, name) hidden_data_ver(local, name)
743 # define libnss_files_hidden_proto(name, attrs...)
744 # define libnss_files_hidden_def(name)
745 # define libnss_files_hidden_weak(name)
746 # define libnss_files_hidden_ver(local, name)
747 # define libnss_files_hidden_data_def(name)
748 # define libnss_files_hidden_data_weak(name)
749 # define libnss_files_hidden_data_ver(local, name)
752 #if defined NOT_IN_libc && defined IS_IN_libnsl
753 # define libnsl_hidden_proto(name, attrs...) hidden_proto (name, ##attrs)
754 # define libnsl_hidden_def(name) hidden_def (name)
755 # define libnsl_hidden_weak(name) hidden_weak (name)
756 # define libnsl_hidden_ver(local, name) hidden_ver (local, name)
757 # define libnsl_hidden_data_def(name) hidden_data_def (name)
758 # define libnsl_hidden_data_weak(name) hidden_data_weak (name)
759 # define libnsl_hidden_data_ver(local, name) hidden_data_ver (local, name)
761 # define libnsl_hidden_proto(name, attrs...)
762 # define libnsl_hidden_def(name)
763 # define libnsl_hidden_weak(name)
764 # define libnsl_hidden_ver(local, name)
765 # define libnsl_hidden_data_def(name)
766 # define libnsl_hidden_data_weak(name)
767 # define libnsl_hidden_data_ver(local, name)
770 #if defined NOT_IN_libc && defined IS_IN_libnss_nisplus
771 # define libnss_nisplus_hidden_proto(name, attrs...) hidden_proto (name, ##attrs)
772 # define libnss_nisplus_hidden_def(name) hidden_def (name)
773 # define libnss_nisplus_hidden_weak(name) hidden_weak (name)
774 # define libnss_nisplus_hidden_ver(local, name) hidden_ver (local, name)
775 # define libnss_nisplus_hidden_data_def(name) hidden_data_def (name)
776 # define libnss_nisplus_hidden_data_weak(name) hidden_data_weak (name)
777 # define libnss_nisplus_hidden_data_ver(local, name) hidden_data_ver (local, name)
779 # define libnss_nisplus_hidden_proto(name, attrs...)
780 # define libnss_nisplus_hidden_def(name)
781 # define libnss_nisplus_hidden_weak(name)
782 # define libnss_nisplus_hidden_ver(local, name)
783 # define libnss_nisplus_hidden_data_def(name)
784 # define libnss_nisplus_hidden_data_weak(name)
785 # define libnss_nisplus_hidden_data_ver(local, name)
788 #define libc_hidden_builtin_proto(name, attrs...) libc_hidden_proto (name, ##attrs)
789 #define libc_hidden_builtin_def(name) libc_hidden_def (name)
790 #define libc_hidden_builtin_weak(name) libc_hidden_weak (name)
791 #define libc_hidden_builtin_ver(local, name) libc_hidden_ver (local, name)
793 # define HIDDEN_BUILTIN_JUMPTARGET(name) HIDDEN_JUMPTARGET(name)
796 #if defined NOT_IN_libc && defined IS_IN_libutil
797 # define libutil_hidden_proto(name, attrs...) hidden_proto (name, ##attrs)
798 # define libutil_hidden_def(name) hidden_def (name)
799 # define libutil_hidden_weak(name) hidden_weak (name)
800 # define libutil_hidden_ver(local, name) hidden_ver (local, name)
801 # define libutil_hidden_data_def(name) hidden_data_def (name)
802 # define libutil_hidden_data_weak(name) hidden_data_weak (name)
803 # define libutil_hidden_data_ver(local, name) hidden_data_ver (local, name)
805 # define libutil_hidden_proto(name, attrs...)
806 # define libutil_hidden_def(name)
807 # define libutil_hidden_weak(name)
808 # define libutil_hidden_ver(local, name)
809 # define libutil_hidden_data_def(name)
810 # define libutil_hidden_data_weak(name)
811 # define libutil_hidden_data_ver(local, name)
814 /* Get some dirty hacks. */
815 #include <symbol-hacks.h>
817 /* Move compatibility symbols out of the way by placing them all in a
819 #ifndef __ASSEMBLER__
820 # define attribute_compat_text_section \
821 __attribute__ ((section (".text.compat")))
822 # define attribute_compat_data_section \
823 __attribute__ ((section (".data.compat")))
825 # define compat_text_section .section ".text.compat", "ax";
826 # define compat_data_section .section ".data.compat", "aw";
829 /* Marker used for indirection function symbols. */
830 #define libc_ifunc(name, expr) \
831 extern void *name##_ifunc (void) __asm__ (#name); \
832 void *name##_ifunc (void) \
835 __typeof (name) *res = expr; \
838 __asm__ (".type " #name ", %gnu_indirect_function");
840 /* The body of the function is supposed to use __get_cpu_features
841 which will, if necessary, initialize the data first. */
842 #define libm_ifunc(name, expr) \
843 extern void *name##_ifunc (void) __asm__ (#name); \
844 void *name##_ifunc (void) \
846 __typeof (name) *res = expr; \
849 __asm__ (".type " #name ", %gnu_indirect_function");
851 #ifdef HAVE_ASM_SET_DIRECTIVE
852 # define libc_ifunc_hidden_def1(local, name) \
853 __asm__ (declare_symbol_alias_1_stringify (ASM_GLOBAL_DIRECTIVE) \
855 ".hidden " #local "\n\t" \
856 ".set " #local ", " #name);
858 # define libc_ifunc_hidden_def1(local, name) \
859 __asm__ (declare_symbol_alias_1_stringify (ASM_GLOBAL_DIRECTIVE) \
861 ".hidden " #local "\n\t" \
865 #define libc_ifunc_hidden_def(name) \
866 libc_ifunc_hidden_def1 (__GI_##name, name)
868 #endif /* libc-symbols.h */