]> git.ipfire.org Git - thirdparty/glibc.git/blame - include/libc-symbols.h
projects / thirdparty / glibc.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
Cleanup of configuration options
[thirdparty/glibc.git] / include / libc-symbols.h
CommitLineData
28f540f4
RM		 1/* Support macros for making weak and strong aliases for symbols,
2 and for using symbol sets and linker warnings with GNU ld.
7b57bfe5
UD		 3 Copyright (C) 1995-1998,2000-2006,2008,2009,2011
4 Free Software Foundation, Inc.
5290baf0 5 This file is part of the GNU C Library.
28f540f4 6
5290baf0 7 The GNU C Library is free software; you can redistribute it and/or
41bdb6e2
AJ		 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.
28f540f4 11
5290baf0
UD		 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
41bdb6e2 15 Lesser General Public License for more details.
28f540f4 16
41bdb6e2
AJ		 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
20 02111-1307 USA. */
28f540f4
RM		 21
22#ifndef _LIBC_SYMBOLS_H
5290baf0 23#define _LIBC_SYMBOLS_H 1
28f540f4
RM		 24
25/* This file's macros are included implicitly in the compilation of every
26 file in the C library by -imacros.
27
28 We include config.h which is generated by configure.
29 It should define for us the following symbols:
30
c224a18a
RM		 31 * HAVE_ASM_SET_DIRECTIVE if we have `.set B, A' instead of `A = B'.
32 * ASM_GLOBAL_DIRECTIVE with `.globl' or `.global'.
b88ac073
RM		 33 * ASM_TYPE_DIRECTIVE_PREFIX with `@' or `#' or whatever for .type,
34 or leave it undefined if there is no .type directive.
c224a18a
RM		 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'.
28f540f4
RM		 38
39 */
28f540f4 40
92777700
RM		 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. */
c709e372 48#define _LIBC 1
92777700 49
d3669add
RM		 50/* Enable declarations of GNU extensions, since we are compiling them. */
51#define _GNU_SOURCE 1
ec4b0518
UD		 52/* And we also need the data for the reentrant functions. */
53#define _REENTRANT 1
d3669add 54
92777700 55#include <config.h>
28f540f4 56
c224a18a 57/* The symbols in all the user (non-_) macros are C symbols.
57d44131 58 NO HAVE_ELF implies a.out. */
28f540f4 59
dfd2257a
UD		 60#if defined HAVE_ASM_WEAK_DIRECTIVE || defined HAVE_ASM_WEAKEXT_DIRECTIVE
61# define HAVE_WEAK_SYMBOLS
28f540f4 62#endif
28f540f4
RM		 63
64#ifndef __SYMBOL_PREFIX
dfd2257a
UD		 65# ifdef NO_UNDERSCORES
66# define __SYMBOL_PREFIX
67# else
68# define __SYMBOL_PREFIX "_"
69# endif
28f540f4
RM		 70#endif
71
72#ifndef C_SYMBOL_NAME
dfd2257a
UD		 73# ifdef NO_UNDERSCORES
74# define C_SYMBOL_NAME(name) name
75# else
76# define C_SYMBOL_NAME(name) _##name
77# endif
28f540f4
RM		 78#endif
79
b15cb495
UD		 80#ifndef ASM_LINE_SEP
81# define ASM_LINE_SEP ;
82#endif
83
c843e065
RM		 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
89# else
90# define C_SYMBOL_DOT_NAME(name) .##name
91# endif
92# endif
256ba888
UD		 93#endif
94
428383e8
UD		 95#ifndef __ASSEMBLER__
96/* GCC understands weak symbols and aliases; use its interface where
97 possible, instead of embedded assembly language. */
d02907df 98
428383e8 99/* Define ALIASNAME as a strong alias for NAME. */
c62f5cab
GM		 100# define strong_alias(name, aliasname) _strong_alias(name, aliasname)
101# define _strong_alias(name, aliasname) \
428383e8
UD		 102 extern __typeof (name) aliasname __attribute__ ((alias (#name)));
103
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__))
108
109# ifdef HAVE_WEAK_SYMBOLS
110
111/* Define ALIASNAME as a weak alias for NAME.
112 If weak aliases are not available, this defines a strong alias. */
c62f5cab
GM		 113# define weak_alias(name, aliasname) _weak_alias (name, aliasname)
114# define _weak_alias(name, aliasname) \
428383e8
UD		 115 extern __typeof (name) aliasname __attribute__ ((weak, alias (#name)));
116
11bf311e
UD		 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")));
123
428383e8 124/* Declare SYMBOL as weak undefined symbol (resolved to 0 if not defined). */
40e94df3
UD		 125# define weak_extern(symbol) _weak_extern (weak symbol)
126# define _weak_extern(expr) _Pragma (#expr)
428383e8
UD		 127
128# else
129
130# define weak_alias(name, aliasname) strong_alias(name, aliasname)
11bf311e 131# define weak_hidden_alias(name, aliasname) strong_alias(name, aliasname)
428383e8
UD		 132# define weak_extern(symbol) /* Nothing. */
133
134# endif
135
136#else /* __ASSEMBLER__ */
137
138# ifdef HAVE_ASM_SET_DIRECTIVE
c843e065
RM		 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 \
28f540f4 147 .set C_SYMBOL_NAME (alias),C_SYMBOL_NAME (original)
c843e065
RM		 148# else
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)
153# endif
dfd2257a 154# else
2aa15430 155# ifdef HAVE_ASM_GLOBAL_DOT_NAME
c843e065
RM		 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 \
2aa15430 160 C_SYMBOL_DOT_NAME (alias) = C_SYMBOL_DOT_NAME (original)
c843e065
RM		 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)
2aa15430 164# else
c843e065
RM		 165# define strong_alias(original, alias) \
166 ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME (alias) ASM_LINE_SEP \
335aa320 167 C_SYMBOL_NAME (alias) = C_SYMBOL_NAME (original)
c843e065 168# define strong_data_alias(original, alias) strong_alias(original, alias)
2aa15430 169# endif
dfd2257a 170# endif
d02907df 171
428383e8 172# ifdef HAVE_WEAK_SYMBOLS
dfd2257a 173# ifdef HAVE_ASM_WEAKEXT_DIRECTIVE
c843e065
RM		 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)
178# else
179# define weak_alias(original, alias) \
c224a18a 180 .weakext C_SYMBOL_NAME (alias), C_SYMBOL_NAME (original)
c843e065
RM		 181# endif
182# define weak_extern(symbol) \
af5b3bc3 183 .weakext C_SYMBOL_NAME (symbol)
c224a18a 184
dfd2257a 185# else /* ! HAVE_ASM_WEAKEXT_DIRECTIVE */
c224a18a 186
2aa15430 187# ifdef HAVE_ASM_GLOBAL_DOT_NAME
c843e065
RM		 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 \
2aa15430
UD		 192 C_SYMBOL_DOT_NAME (alias) = C_SYMBOL_DOT_NAME (original)
193# else
c843e065
RM		 194# define weak_alias(original, alias) \
195 .weak C_SYMBOL_NAME (alias) ASM_LINE_SEP \
28f540f4 196 C_SYMBOL_NAME (alias) = C_SYMBOL_NAME (original)
2aa15430 197# endif
e6964dd4 198
c843e065 199# define weak_extern(symbol) \
af5b3bc3 200 .weak C_SYMBOL_NAME (symbol)
d02907df 201
dfd2257a 202# endif /* ! HAVE_ASM_WEAKEXT_DIRECTIVE */
c224a18a 203
428383e8 204# else /* ! HAVE_WEAK_SYMBOLS */
af5b3bc3 205
428383e8
UD		 206# define weak_alias(original, alias) strong_alias(original, alias)
207# define weak_extern(symbol) /* Nothing */
208# endif /* ! HAVE_WEAK_SYMBOLS */
af5b3bc3 209
428383e8 210#endif /* __ASSEMBLER__ */
958f803f 211
dfd2257a
UD		 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
214 convention. */
215#ifndef internal_function
216# define internal_function /* empty */
217#endif
28f540f4 218
e862aada
UD		 219/* Determine the return address. */
220#define RETURN_ADDRESS(nr) \
221 __builtin_extract_return_addr (__builtin_return_address (nr))
222
44c8d1a2
RM		 223/* When a reference to SYMBOL is encountered, the linker will emit a
224 warning message MSG. */
57d44131 225#ifdef HAVE_ELF
fd26970f
UD		 226
227/* We want the .gnu.warning.SYMBOL section to be unallocated. */
57d44131
UD		 228# ifdef HAVE_ASM_PREVIOUS_DIRECTIVE
229# define __make_section_unallocated(section_string) \
b15cb495 230 asm (".section " section_string "\n\t.previous");
57d44131
UD		 231# elif defined HAVE_ASM_POPSECTION_DIRECTIVE
232# define __make_section_unallocated(section_string) \
b15cb495 233 asm (".pushsection " section_string "\n\t.popsection");
57d44131
UD		 234# else
235# define __make_section_unallocated(section_string)
236# endif
fd26970f 237
b15cb495
UD		 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. */
57d44131
UD		 240# ifdef HAVE_SECTION_QUOTES
241# define __sec_comment "\"\n\t#\""
242# else
243# define __sec_comment "\n\t#"
244# endif
245# define link_warning(symbol, msg) \
e26dd47f 246 __make_section_unallocated (".gnu.warning." #symbol) \
44c8d1a2 247 static const char __evoke_link_warning_##symbol[] \
6c5775c3 248 __attribute__ ((used, section (".gnu.warning." #symbol __sec_comment))) \
c877418f 249 = msg;
57d44131 250# define libc_freeres_ptr(decl) \
362f5ae2 251 __make_section_unallocated ("__libc_freeres_ptrs, \"aw\", %nobits") \
c877418f 252 decl __attribute__ ((section ("__libc_freeres_ptrs" __sec_comment)))
57d44131 253# define __libc_freeres_fn_section \
c877418f 254 __attribute__ ((section ("__libc_freeres_fn")))
57d44131
UD		 255#else /* Not ELF: a.out */
256# ifdef HAVE_XCOFF
5af3245a
UD		 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. */
57d44131
UD		 261# define link_warning(symbol, msg)
262# else
263# define link_warning(symbol, msg) \
5af3245a 264 asm (".stabs \"" msg "\",30,0,0,0\n\t" \
7b57bfe5 265 ".stabs \"" __SYMBOL_PREFIX #symbol "\",1,0,0,0\n");
57d44131 266# endif /* XCOFF */
c877418f
RM		 267# define libc_freeres_ptr(decl) decl
268# define __libc_freeres_fn_section
28f540f4 269#endif
c877418f
RM		 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)
28f540f4
RM		 274
275/* A canned warning for sysdeps/stub functions. */
276#define stub_warning(name) \
561bcb80 277 __make_section_unallocated (".gnu.glibc-stub." #name) \
44c8d1a2
RM		 278 link_warning (name, \
279 "warning: " #name " is not implemented and will always fail")
5f9e57ba 280
2f7f7bc6
UD		 281/* Warning for linking functions calling dlopen into static binaries. */
282#ifdef SHARED
283#define static_link_warning(name)
284#else
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 \
288requires at runtime the shared libraries from the glibc version used \
289for linking")
290#endif
b88ac073 291
11bf311e
UD		 292/* Declare SYMBOL to be TYPE (`function' or `object') of SIZE bytes
293 alias to ORIGINAL, when the assembler supports such declarations
294 (such as in ELF).
b88ac073
RM		 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
297 thinks it is. */
11bf311e
UD		 298#define declare_symbol_alias(symbol, original, type, size) \
299 declare_symbol_alias_1 (symbol, original, type, size)
b88ac073
RM		 300#ifdef ASM_TYPE_DIRECTIVE_PREFIX
301# ifdef __ASSEMBLER__
11bf311e
UD		 302# define declare_symbol_alias_1(symbol, original, type, size) \
303 strong_alias (original, symbol); \
b88ac073 304 .type C_SYMBOL_NAME (symbol), \
11bf311e
UD		 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
b88ac073 310# else /* Not __ASSEMBLER__. */
11bf311e
UD		 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 \
b88ac073 317 "\n\t.size " __SYMBOL_PREFIX #symbol ", " #size);
11bf311e
UD		 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
324# else
325# define declare_symbol_alias_1_alias(symbol, original) \
326 __SYMBOL_PREFIX #symbol " = " __SYMBOL_PREFIX #original
327# endif /* HAVE_ASM_SET_DIRECTIVE */
b88ac073
RM		 328# endif /* __ASSEMBLER__ */
329#else
330# define declare_symbol_1(symbol, type, size) /* Nothing. */
331#endif
332
333
5f9e57ba 334/*
28f540f4 335\f
5f9e57ba
RM		 336*/
337
28f540f4
RM		 338/* Symbol set support macros. */
339
57d44131 340#ifdef HAVE_ELF
28f540f4
RM		 341
342/* Make SYMBOL, which is in the text segment, an element of SET. */
57d44131 343# define text_set_element(set, symbol) _elf_set_element(set, symbol)
28f540f4 344/* Make SYMBOL, which is in the data segment, an element of SET. */
57d44131 345# define data_set_element(set, symbol) _elf_set_element(set, symbol)
28f540f4 346/* Make SYMBOL, which is in the bss segment, an element of SET. */
57d44131 347# define bss_set_element(set, symbol) _elf_set_element(set, symbol)
28f540f4
RM		 348
349/* These are all done the same way in ELF.
350 There is a new section created for each set. */
57d44131 351# ifdef SHARED
53afa8d9
RM		 352/* When building a shared library, make the set section writable,
353 because it will need to be relocated at run time anyway. */
57d44131 354# define _elf_set_element(set, symbol) \
53afa8d9 355 static const void *__elf_set_##set##_element_##symbol##__ \
6c5775c3 356 __attribute__ ((used, section (#set))) = &(symbol)
57d44131
UD		 357# else
358# define _elf_set_element(set, symbol) \
28f540f4 359 static const void *const __elf_set_##set##_element_##symbol##__ \
6c5775c3 360 __attribute__ ((used, section (#set))) = &(symbol)
57d44131 361# endif
28f540f4
RM		 362
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. */
57d44131 365# define symbol_set_define(set) symbol_set_declare(set)
28f540f4 366
20792f99
RM		 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
370 weak references. */
57d44131 371# define symbol_set_declare(set) \
6f1e513d
RH		 372 extern char const __start_##set[] __symbol_set_attribute; \
373 extern char const __stop_##set[] __symbol_set_attribute;
57d44131
UD		 374# ifdef SHARED
375# define __symbol_set_attribute attribute_hidden
376# else
377# define __symbol_set_attribute __attribute__ ((weak))
378# endif
28f540f4
RM		 379
380/* Return a pointer (void *const *) to the first element of SET. */
57d44131 381# define symbol_set_first_element(set) ((void *const *) (&__start_##set))
28f540f4
RM		 382
383/* Return true iff PTR (a void *const *) has been incremented
384 past the last element in SET. */
57d44131 385# define symbol_set_end_p(set, ptr) ((ptr) >= (void *const *) &__stop_##set)
28f540f4 386
57d44131 387#else /* Not ELF: a.out. */
28f540f4 388
57d44131 389# ifdef HAVE_XCOFF
5af3245a
UD		 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. */
57d44131
UD		 394# define text_set_element(set, symbol)
395# define data_set_element(set, symbol)
396# define bss_set_element(set, symbol)
397# else
398# define text_set_element(set, symbol) \
5af3245a 399 asm (".stabs \"" __SYMBOL_PREFIX #set "\",23,0,0," __SYMBOL_PREFIX #symbol)
57d44131 400# define data_set_element(set, symbol) \
5af3245a 401 asm (".stabs \"" __SYMBOL_PREFIX #set "\",25,0,0," __SYMBOL_PREFIX #symbol)
57d44131
UD		 402# define bss_set_element(set, symbol) ?error Must use initialized data.
403# endif /* XCOFF */
404# define symbol_set_define(set) void *const (set)[1];
a2a89dd6
UD		 405# define symbol_set_declare(set) extern void *const (set)[1];
406
407# define symbol_set_first_element(set) &(set)[1]
408# define symbol_set_end_p(set, ptr) (*(ptr) == 0)
57d44131
UD		 409
410#endif /* ELF. */
28f540f4 411
1ea89a40 412#if DO_VERSIONING
ebdf53a7 413# define symbol_version(real, name, version) \
8b943b4a 414 _symbol_version(real, name, version)
ebdf53a7
GM		 415# define default_symbol_version(real, name, version) \
416 _default_symbol_version(real, name, version)
417# ifdef __ASSEMBLER__
c843e065
RM		 418# ifdef HAVE_ASM_GLOBAL_DOT_NAME
419# define _symbol_version(real, name, version) \
420 .symver real, name##@##version ASM_LINE_SEP \
5ef6ae4b 421 .symver C_SYMBOL_DOT_NAME(real), C_SYMBOL_DOT_NAME(name##@##version)
c843e065
RM		 422# define _default_symbol_version(real, name, version) \
423 .symver real, name##@##@##version ASM_LINE_SEP \
5ef6ae4b 424 .symver C_SYMBOL_DOT_NAME(real), C_SYMBOL_DOT_NAME(name##@##@##version)
c843e065
RM		 425# else
426# define _symbol_version(real, name, version) \
da2d1bc5 427 .symver real, name##@##version
c843e065 428# define _default_symbol_version(real, name, version) \
da2d1bc5 429 .symver real, name##@##@##version
c843e065 430# endif
da2d1bc5 431# else
c843e065
RM		 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)
439# else
440# define _symbol_version(real, name, version) \
1ea89a40 441 __asm__ (".symver " #real "," #name "@" #version)
c843e065 442# define _default_symbol_version(real, name, version) \
f2ea0f5b 443 __asm__ (".symver " #real "," #name "@@" #version)
c843e065 444# endif
da2d1bc5 445# endif
1ea89a40
UD		 446#else
447# define symbol_version(real, name, version)
da2d1bc5
UD		 448# define default_symbol_version(real, name, version) \
449 strong_alias(real, name)
1ea89a40
UD		 450#endif
451
11bf311e 452#if defined SHARED || defined LIBC_NONSHARED
e6caf4e1
UD		 453# define attribute_hidden __attribute__ ((visibility ("hidden")))
454#else
455# define attribute_hidden
456#endif
457
3ce1f295 458#define attribute_tls_model_ie __attribute__ ((tls_model ("initial-exec")))
9b21e6bc 459
11bf311e 460#define attribute_relro __attribute__ ((section (".data.rel.ro")))
392a6b52 461
7969407a
UD		 462/* Handling on non-exported internal names. We have to do this only
463 for shared code. */
464#ifdef SHARED
cff26a3e 465# define INTUSE(name) name##_internal
e6caf4e1
UD		 466# define INTDEF(name) strong_alias (name, name##_internal)
467# define INTVARDEF(name) \
1897bc3f 468 _INTVARDEF (name, name##_internal)
11bf311e 469# define _INTVARDEF(name, aliasname) \
100351c3
UD		 470 extern __typeof (name) aliasname __attribute__ ((alias (#name), \
471 visibility ("hidden")));
e6caf4e1 472# define INTDEF2(name, newname) strong_alias (name, newname##_internal)
1897bc3f 473# define INTVARDEF2(name, newname) _INTVARDEF (name, newname##_internal)
7969407a 474#else
cff26a3e 475# define INTUSE(name) name
7969407a 476# define INTDEF(name)
e6caf4e1 477# define INTVARDEF(name)
77fe0b9c 478# define INTDEF2(name, newname)
1897bc3f 479# define INTVARDEF2(name, newname)
7969407a
UD		 480#endif
481
37ba7d66
UD		 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,
485 say in foo/foo.h:
486
487 int foo (int __bar);
488
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:
491
492 libc_hidden_proto (foo)
493
494 line and after the foo function definition:
495
496 int foo (int __bar)
497 {
498 return __bar;
499 }
500 libc_hidden_def (foo)
501
502 or
503
504 int foo (int __bar)
505 {
506 return __bar;
507 }
508 libc_hidden_weak (foo)
509
5536dfcb 510 Similarly for global data. If references to foo within libc.so should
c843e065
RM		 511 always go to foo defined in libc.so, then in include/foo.h you add:
512
513 libc_hidden_proto (foo)
514
515 line and after foo's definition:
516
517 int foo = INITIAL_FOO_VALUE;
518 libc_hidden_data_def (foo)
519
520 or
521
522 int foo = INITIAL_FOO_VALUE;
523 libc_hidden_data_weak (foo)
524
5536dfcb 525 If foo is normally just an alias (strong or weak) to some other function,
37ba7d66
UD		 526 you should use the normal strong_alias first, then add libc_hidden_def
527 or libc_hidden_weak:
528
529 int baz (int __bar)
530 {
531 return __bar;
532 }
533 strong_alias (baz, foo)
534 libc_hidden_weak (foo)
535
536 If the function should be internal to multiple objects, say ld.so and
537 libc.so, the best way is to use:
538
539 #if !defined NOT_IN_libc || defined IS_IN_rtld
540 hidden_proto (foo)
541 #endif
542
543 in include/foo.h and the normal macros at all function definitions
544 depending on what DSO they belong to.
545
546 If versioned_symbol macro is used to define foo,
547 libc_hidden_ver macro should be used, as in:
548
549 int __real_foo (int __bar)
550 {
551 return __bar;
552 }
553 versioned_symbol (libc, __real_foo, foo, GLIBC_2_1);
554 libc_hidden_ver (__real_foo, foo) */
555
11bf311e 556#if defined SHARED && defined DO_VERSIONING && !defined NO_HIDDEN
37ba7d66 557# ifndef __ASSEMBLER__
11bf311e 558# define __hidden_proto_hiddenattr(attrs...) \
81cb0d82 559 __attribute__ ((visibility ("hidden"), ##attrs))
81cb0d82
UD		 560# define hidden_proto(name, attrs...) \
561 __hidden_proto (name, __GI_##name, ##attrs)
562# define __hidden_proto(name, internal, attrs...) \
a585ba22 563 extern __typeof (name) name __asm__ (__hidden_asmname (#internal)) \
81cb0d82 564 __hidden_proto_hiddenattr (attrs);
37ba7d66
UD		 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
61995d3e
RM		 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)
7b57bfe5
UD		 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);
37ba7d66
UD		 589# else
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.
4547dee3
RM		 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
dce8f2b6 598 is to call via the HIDDEN_JUMPTARGET macro instead of JUMPTARGET. */
4547dee3
RM		 599# define hidden_def(name) strong_alias (name, __GI_##name)
600# define hidden_weak(name) hidden_def (name)
37ba7d66 601# define hidden_ver(local, name) strong_alias (local, __GI_##name)
c843e065
RM		 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
607# else
608# define HIDDEN_JUMPTARGET(name) __GI_##name
609# endif
37ba7d66
UD		 610# endif
611#else
4547dee3 612# ifndef __ASSEMBLER__
81cb0d82 613# define hidden_proto(name, attrs...)
4547dee3
RM		 614# else
615# define HIDDEN_JUMPTARGET(name) JUMPTARGET(name)
616# endif /* Not __ASSEMBLER__ */
617# define hidden_weak(name)
37ba7d66
UD		 618# define hidden_def(name)
619# define hidden_ver(local, name)
c843e065
RM		 620# define hidden_data_weak(name)
621# define hidden_data_def(name)
622# define hidden_data_ver(local, name)
37ba7d66
UD		 623#endif
624
c5598d47 625#if !defined NOT_IN_libc
81cb0d82 626# define libc_hidden_proto(name, attrs...) hidden_proto (name, ##attrs)
37ba7d66
UD		 627# define libc_hidden_def(name) hidden_def (name)
628# define libc_hidden_weak(name) hidden_weak (name)
7b57bfe5 629# define libc_hidden_nolink(name, version) hidden_nolink (name, libc, version)
37ba7d66 630# define libc_hidden_ver(local, name) hidden_ver (local, name)
c843e065
RM		 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)
37ba7d66 634#else
81cb0d82 635# define libc_hidden_proto(name, attrs...)
37ba7d66
UD		 636# define libc_hidden_def(name)
637# define libc_hidden_weak(name)
638# define libc_hidden_ver(local, name)
c843e065
RM		 639# define libc_hidden_data_def(name)
640# define libc_hidden_data_weak(name)
641# define libc_hidden_data_ver(local, name)
37ba7d66
UD		 642#endif
643
c5598d47 644#if defined NOT_IN_libc && defined IS_IN_rtld
81cb0d82 645# define rtld_hidden_proto(name, attrs...) hidden_proto (name, ##attrs)
37ba7d66
UD		 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)
c843e065
RM		 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)
37ba7d66 652#else
81cb0d82 653# define rtld_hidden_proto(name, attrs...)
37ba7d66
UD		 654# define rtld_hidden_def(name)
655# define rtld_hidden_weak(name)
656# define rtld_hidden_ver(local, name)
c843e065
RM		 657# define rtld_hidden_data_def(name)
658# define rtld_hidden_data_weak(name)
659# define rtld_hidden_data_ver(local, name)
37ba7d66
UD		 660#endif
661
c5598d47 662#if defined NOT_IN_libc && defined IS_IN_libm
81cb0d82 663# define libm_hidden_proto(name, attrs...) hidden_proto (name, ##attrs)
37ba7d66
UD		 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)
c843e065
RM		 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)
37ba7d66 670#else
81cb0d82 671# define libm_hidden_proto(name, attrs...)
37ba7d66
UD		 672# define libm_hidden_def(name)
673# define libm_hidden_weak(name)
674# define libm_hidden_ver(local, name)
c843e065
RM		 675# define libm_hidden_data_def(name)
676# define libm_hidden_data_weak(name)
677# define libm_hidden_data_ver(local, name)
37ba7d66
UD		 678#endif
679
6f9d8e68
UD		 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)
688#else
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)
696#endif
697
a9564ae9
UD		 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)
706#else
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)
714#endif
715
5f21997b
UD		 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)
724#else
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)
732#endif
733
44843eee
UD		 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)
742#else
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)
750#endif
751
1d5cee23
UD		 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)
760#else
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)
768#endif
769
b31b32b3
UD		 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)
778#else
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)
786#endif
787
3ce1f295
UD		 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)
792#ifdef __ASSEMBLER__
793# define HIDDEN_BUILTIN_JUMPTARGET(name) HIDDEN_JUMPTARGET(name)
85dd1003
UD		 794#endif
795
b31b32b3
UD		 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)
804#else
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)
812#endif
813
b30542fb
UD		 814/* Get some dirty hacks. */
815#include <symbol-hacks.h>
816
4a381a81
UD		 817/* Move compatibility symbols out of the way by placing them all in a
818 special section. */
d3a4a571
UD		 819#ifndef __ASSEMBLER__
820# define attribute_compat_text_section \
4a381a81 821 __attribute__ ((section (".text.compat")))
d3a4a571 822# define attribute_compat_data_section \
4a381a81 823 __attribute__ ((section (".data.compat")))
d3a4a571
UD		 824#else
825# define compat_text_section .section ".text.compat", "ax";
826# define compat_data_section .section ".data.compat", "aw";
827#endif
4a381a81 828
425ce2ed
UD		 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) \
833 { \
834 INIT_ARCH (); \
835 __typeof (name) *res = expr; \
836 return res; \
837 } \
838 __asm__ (".type " #name ", %gnu_indirect_function");
839
9a1d2d45
UD		 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) \
845 { \
846 __typeof (name) *res = expr; \
847 return res; \
848 } \
849 __asm__ (".type " #name ", %gnu_indirect_function");
850
74414708
UD		 851#ifdef HAVE_ASM_SET_DIRECTIVE
852# define libc_ifunc_hidden_def1(local, name) \
853 __asm__ (declare_symbol_alias_1_stringify (ASM_GLOBAL_DIRECTIVE) \
854 " " #local "\n\t" \
855 ".hidden " #local "\n\t" \
856 ".set " #local ", " #name);
857#else
858# define libc_ifunc_hidden_def1(local, name) \
859 __asm__ (declare_symbol_alias_1_stringify (ASM_GLOBAL_DIRECTIVE) \
860 " " #local "\n\t" \
861 ".hidden " #local "\n\t" \
862 #local " = " #name);
863#endif
864
865#define libc_ifunc_hidden_def(name) \
866 libc_ifunc_hidden_def1 (__GI_##name, name)
867
28f540f4 868#endif /* libc-symbols.h */
A mirror of the official glibc repository