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) 1995-2016 Free Software Foundation, Inc.
   4    This file is part of the GNU C Library.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, see
  18    <http://www.gnu.org/licenses/>.  */
  19
  20 #ifndef _LIBC_SYMBOLS_H
  21 #define _LIBC_SYMBOLS_H 1
  22
  23 #define IN_MODULE PASTE_NAME (MODULE_, MODULE_NAME)
  24 #define IS_IN(lib) (IN_MODULE == MODULE_##lib)
  25
  26 /* Returns true if the current module is a versioned library.  Versioned
  27    library names culled from shlib-versions files are assigned a MODULE_*
  28    value lower than MODULE_LIBS_BEGIN.  */
  29 #define IS_IN_LIB (IN_MODULE > MODULE_LIBS_BEGIN)
  30
  31 #define PASTE_NAME(a,b)      PASTE_NAME1 (a,b)
  32 #define PASTE_NAME1(a,b)     a##b
  33
  34 /* This file's macros are included implicitly in the compilation of every
  35    file in the C library by -imacros.
  36
  37    We include config.h which is generated by configure.
  38    It should define for us the following symbol:
  39
  40    * HAVE_ASM_SET_DIRECTIVE if we have `.set B, A' instead of `A = B'.
  41
  42    */
  43
  44 /* This is defined for the compilation of all C library code.  features.h
  45    tests this to avoid inclusion of stubs.h while compiling the library,
  46    before stubs.h has been generated.  Some library code that is shared
  47    with other packages also tests this symbol to see if it is being
  48    compiled as part of the C library.  We must define this before including
  49    config.h, because it makes some definitions conditional on whether libc
  50    itself is being compiled, or just some generator program.  */
  51 #define _LIBC   1
  52
  53 /* Enable declarations of GNU extensions, since we are compiling them.  */
  54 #define _GNU_SOURCE     1
  55 /* And we also need the data for the reentrant functions.  */
  56 #define _REENTRANT      1
  57
  58 #include <config.h>
  59
  60 /* Define this for the benefit of portable GNU code that wants to check it.
  61    Code that checks with #if will not #include <config.h> again, since we've
  62    already done it (and this file is implicitly included in every compile,
  63    via -include).  Code that checks with #ifdef will #include <config.h>,
  64    but that file should always be idempotent (i.e., it's just #define/#undef
  65    and nothing else anywhere should be changing the macro state it touches),
  66    so it's harmless.  */
  67 #define HAVE_CONFIG_H   0
  68
  69 /* Define these macros for the benefit of portable GNU code that wants to check
  70    them.  Of course, STDC_HEADERS is never false when building libc!  */
  71 #define STDC_HEADERS    1
  72 #define HAVE_MBSTATE_T  1
  73 #define HAVE_MBSRTOWCS  1
  74 #define HAVE_LIBINTL_H  1
  75 #define HAVE_WCTYPE_H   1
  76 #define HAVE_ISWCTYPE   1
  77 #define ENABLE_NLS      1
  78
  79 /* The symbols in all the user (non-_) macros are C symbols.  */
  80
  81 #ifndef __SYMBOL_PREFIX
  82 # define __SYMBOL_PREFIX
  83 #endif
  84
  85 #ifndef C_SYMBOL_NAME
  86 # define C_SYMBOL_NAME(name) name
  87 #endif
  88
  89 #ifndef ASM_LINE_SEP
  90 # define ASM_LINE_SEP ;
  91 #endif
  92
  93 #ifndef __ASSEMBLER__
  94 /* GCC understands weak symbols and aliases; use its interface where
  95    possible, instead of embedded assembly language.  */
  96
  97 /* Define ALIASNAME as a strong alias for NAME.  */
  98 # define strong_alias(name, aliasname) _strong_alias(name, aliasname)
  99 # define _strong_alias(name, aliasname) \
 100   extern __typeof (name) aliasname __attribute__ ((alias (#name)));
 101
 102 /* This comes between the return type and function name in
 103    a function definition to make that definition weak.  */
 104 # define weak_function __attribute__ ((weak))
 105 # define weak_const_function __attribute__ ((weak, __const__))
 106
 107 /* Define ALIASNAME as a weak alias for NAME.
 108    If weak aliases are not available, this defines a strong alias.  */
 109 # define weak_alias(name, aliasname) _weak_alias (name, aliasname)
 110 # define _weak_alias(name, aliasname) \
 111   extern __typeof (name) aliasname __attribute__ ((weak, alias (#name)));
 112
 113 /* Same as WEAK_ALIAS, but mark symbol as hidden.  */
 114 # define weak_hidden_alias(name, aliasname) \
 115   _weak_hidden_alias (name, aliasname)
 116 # define _weak_hidden_alias(name, aliasname) \
 117   extern __typeof (name) aliasname \
 118     __attribute__ ((weak, alias (#name), __visibility__ ("hidden")));
 119
 120 /* Declare SYMBOL as weak undefined symbol (resolved to 0 if not defined).  */
 121 # define weak_extern(symbol) _weak_extern (weak symbol)
 122 # define _weak_extern(expr) _Pragma (#expr)
 123
 124
 125 #else /* __ASSEMBLER__ */
 126
 127 # ifdef HAVE_ASM_SET_DIRECTIVE
 128 #  define strong_alias(original, alias)                         \
 129   .globl C_SYMBOL_NAME (alias) ASM_LINE_SEP             \
 130   .set C_SYMBOL_NAME (alias),C_SYMBOL_NAME (original)
 131 #  define strong_data_alias(original, alias) strong_alias(original, alias)
 132 # else
 133 #  define strong_alias(original, alias)                         \
 134   .globl C_SYMBOL_NAME (alias) ASM_LINE_SEP             \
 135   C_SYMBOL_NAME (alias) = C_SYMBOL_NAME (original)
 136 #  define strong_data_alias(original, alias) strong_alias(original, alias)
 137 # endif
 138
 139 # define weak_alias(original, alias)                                    \
 140   .weak C_SYMBOL_NAME (alias) ASM_LINE_SEP                              \
 141   C_SYMBOL_NAME (alias) = C_SYMBOL_NAME (original)
 142
 143 # define weak_extern(symbol)                                            \
 144   .weak C_SYMBOL_NAME (symbol)
 145
 146 #endif /* __ASSEMBLER__ */
 147
 148 /* On some platforms we can make internal function calls (i.e., calls of
 149    functions not exported) a bit faster by using a different calling
 150    convention.  */
 151 #ifndef internal_function
 152 # define internal_function      /* empty */
 153 #endif
 154
 155 /* Determine the return address.  */
 156 #define RETURN_ADDRESS(nr) \
 157   __builtin_extract_return_addr (__builtin_return_address (nr))
 158
 159 /* When a reference to SYMBOL is encountered, the linker will emit a
 160    warning message MSG.  */
 161 /* We want the .gnu.warning.SYMBOL section to be unallocated.  */
 162 #define __make_section_unallocated(section_string)      \
 163   asm (".section " section_string "\n\t.previous");
 164
 165 /* Tacking on "\n\t#" to the section name makes gcc put it's bogus
 166    section attributes on what looks like a comment to the assembler.  */
 167 #ifdef HAVE_SECTION_QUOTES
 168 # define __sec_comment "\"\n\t#\""
 169 #else
 170 # define __sec_comment "\n\t#"
 171 #endif
 172 #define link_warning(symbol, msg) \
 173   __make_section_unallocated (".gnu.warning." #symbol) \
 174   static const char __evoke_link_warning_##symbol[]     \
 175     __attribute__ ((used, section (".gnu.warning." #symbol __sec_comment))) \
 176     = msg;
 177 #define libc_freeres_ptr(decl) \
 178   __make_section_unallocated ("__libc_freeres_ptrs, \"aw\", %nobits") \
 179   decl __attribute__ ((section ("__libc_freeres_ptrs" __sec_comment)))
 180 #define __libc_freeres_fn_section \
 181   __attribute__ ((section ("__libc_freeres_fn")))
 182
 183 #define libc_freeres_fn(name)   \
 184   static void name (void) __attribute_used__ __libc_freeres_fn_section; \
 185   text_set_element (__libc_subfreeres, name);                           \
 186   static void name (void)
 187
 188 /* A canned warning for sysdeps/stub functions.  */
 189 #define stub_warning(name) \
 190   __make_section_unallocated (".gnu.glibc-stub." #name) \
 191   link_warning (name, #name " is not implemented and will always fail")
 192
 193 /* Warning for linking functions calling dlopen into static binaries.  */
 194 #ifdef SHARED
 195 #define static_link_warning(name)
 196 #else
 197 #define static_link_warning(name) static_link_warning1(name)
 198 #define static_link_warning1(name) \
 199   link_warning(name, "Using '" #name "' in statically linked applications \
 200 requires at runtime the shared libraries from the glibc version used \
 201 for linking")
 202 #endif
 203
 204 /* Declare SYMBOL to be TYPE (`function' or `object') of SIZE bytes
 205    alias to ORIGINAL, when the assembler supports such declarations
 206    (such as in ELF).
 207    This is only necessary when defining something in assembly, or playing
 208    funny alias games where the size should be other than what the compiler
 209    thinks it is.  */
 210 #define declare_symbol_alias(symbol, original, type, size) \
 211   declare_symbol_alias_1 (symbol, original, type, size)
 212 #ifdef __ASSEMBLER__
 213 # define declare_symbol_alias_1(symbol, original, type, size) \
 214    strong_alias (original, symbol); \
 215    .type C_SYMBOL_NAME (symbol), %##type; \
 216    .size C_SYMBOL_NAME (symbol), size
 217 #else /* Not __ASSEMBLER__.  */
 218 # define declare_symbol_alias_1(symbol, original, type, size) \
 219    asm (".globl " __SYMBOL_PREFIX #symbol \
 220         "\n\t" declare_symbol_alias_1_alias (symbol, original) \
 221         "\n\t.type " __SYMBOL_PREFIX #symbol ", " \
 222         "%" #type \
 223         "\n\t.size " __SYMBOL_PREFIX #symbol ", " #size);
 224 # ifdef HAVE_ASM_SET_DIRECTIVE
 225 #  define declare_symbol_alias_1_alias(symbol, original) \
 226      ".set " __SYMBOL_PREFIX #symbol ", " __SYMBOL_PREFIX #original
 227 # else
 228 #  define declare_symbol_alias_1_alias(symbol, original) \
 229      __SYMBOL_PREFIX #symbol " = " __SYMBOL_PREFIX #original
 230 # endif /* HAVE_ASM_SET_DIRECTIVE */
 231 #endif /* __ASSEMBLER__ */
 232
 233
 234 /*
 235 \f
 236 */
 237
 238 /* Symbol set support macros.  */
 239
 240 /* Make SYMBOL, which is in the text segment, an element of SET.  */
 241 #define text_set_element(set, symbol)   _elf_set_element(set, symbol)
 242 /* Make SYMBOL, which is in the data segment, an element of SET.  */
 243 #define data_set_element(set, symbol)   _elf_set_element(set, symbol)
 244 /* Make SYMBOL, which is in the bss segment, an element of SET.  */
 245 #define bss_set_element(set, symbol)    _elf_set_element(set, symbol)
 246
 247 /* These are all done the same way in ELF.
 248    There is a new section created for each set.  */
 249 #ifdef SHARED
 250 /* When building a shared library, make the set section writable,
 251    because it will need to be relocated at run time anyway.  */
 252 # define _elf_set_element(set, symbol) \
 253   static const void *__elf_set_##set##_element_##symbol##__ \
 254     __attribute__ ((used, section (#set))) = &(symbol)
 255 #else
 256 # define _elf_set_element(set, symbol) \
 257   static const void *const __elf_set_##set##_element_##symbol##__ \
 258     __attribute__ ((used, section (#set))) = &(symbol)
 259 #endif
 260
 261 /* Define SET as a symbol set.  This may be required (it is in a.out) to
 262    be able to use the set's contents.  */
 263 #define symbol_set_define(set)  symbol_set_declare(set)
 264
 265 /* Declare SET for use in this module, if defined in another module.
 266    In a shared library, this is always local to that shared object.
 267    For static linking, the set might be wholly absent and so we use
 268    weak references.  */
 269 #define symbol_set_declare(set) \
 270   extern char const __start_##set[] __symbol_set_attribute; \
 271   extern char const __stop_##set[] __symbol_set_attribute;
 272 #ifdef SHARED
 273 # define __symbol_set_attribute attribute_hidden
 274 #else
 275 # define __symbol_set_attribute __attribute__ ((weak))
 276 #endif
 277
 278 /* Return a pointer (void *const *) to the first element of SET.  */
 279 #define symbol_set_first_element(set)   ((void *const *) (&__start_##set))
 280
 281 /* Return true iff PTR (a void *const *) has been incremented
 282    past the last element in SET.  */
 283 #define symbol_set_end_p(set, ptr) ((ptr) >= (void *const *) &__stop_##set)
 284
 285 #ifdef SHARED
 286 # define symbol_version(real, name, version) \
 287      _symbol_version(real, name, version)
 288 # define default_symbol_version(real, name, version) \
 289      _default_symbol_version(real, name, version)
 290 # ifdef __ASSEMBLER__
 291 #  define _symbol_version(real, name, version) \
 292      .symver real, name##@##version
 293 #  define _default_symbol_version(real, name, version) \
 294      .symver real, name##@##@##version
 295 # else
 296 #  define _symbol_version(real, name, version) \
 297      __asm__ (".symver " #real "," #name "@" #version)
 298 #  define _default_symbol_version(real, name, version) \
 299      __asm__ (".symver " #real "," #name "@@" #version)
 300 # endif
 301 #else
 302 # define symbol_version(real, name, version)
 303 # define default_symbol_version(real, name, version) \
 304   strong_alias(real, name)
 305 #endif
 306
 307 #if defined SHARED || defined LIBC_NONSHARED
 308 # define attribute_hidden __attribute__ ((visibility ("hidden")))
 309 #else
 310 # define attribute_hidden
 311 #endif
 312
 313 #define attribute_tls_model_ie __attribute__ ((tls_model ("initial-exec")))
 314
 315 #define attribute_relro __attribute__ ((section (".data.rel.ro")))
 316
 317 /* The following macros are used for PLT bypassing within libc.so
 318    (and if needed other libraries similarly).
 319    First of all, you need to have the function prototyped somewhere,
 320    say in foo/foo.h:
 321
 322    int foo (int __bar);
 323
 324    If calls to foo within libc.so should always go to foo defined in libc.so,
 325    then in include/foo.h you add:
 326
 327    libc_hidden_proto (foo)
 328
 329    line and after the foo function definition:
 330
 331    int foo (int __bar)
 332    {
 333      return __bar;
 334    }
 335    libc_hidden_def (foo)
 336
 337    or
 338
 339    int foo (int __bar)
 340    {
 341      return __bar;
 342    }
 343    libc_hidden_weak (foo)
 344
 345    Similarly for global data.  If references to foo within libc.so should
 346    always go to foo defined in libc.so, then in include/foo.h you add:
 347
 348    libc_hidden_proto (foo)
 349
 350    line and after foo's definition:
 351
 352    int foo = INITIAL_FOO_VALUE;
 353    libc_hidden_data_def (foo)
 354
 355    or
 356
 357    int foo = INITIAL_FOO_VALUE;
 358    libc_hidden_data_weak (foo)
 359
 360    If foo is normally just an alias (strong or weak) to some other function,
 361    you should use the normal strong_alias first, then add libc_hidden_def
 362    or libc_hidden_weak:
 363
 364    int baz (int __bar)
 365    {
 366      return __bar;
 367    }
 368    strong_alias (baz, foo)
 369    libc_hidden_weak (foo)
 370
 371    If the function should be internal to multiple objects, say ld.so and
 372    libc.so, the best way is to use:
 373
 374    #if IS_IN (libc) || IS_IN (rtld)
 375    hidden_proto (foo)
 376    #endif
 377
 378    in include/foo.h and the normal macros at all function definitions
 379    depending on what DSO they belong to.
 380
 381    If versioned_symbol macro is used to define foo,
 382    libc_hidden_ver macro should be used, as in:
 383
 384    int __real_foo (int __bar)
 385    {
 386      return __bar;
 387    }
 388    versioned_symbol (libc, __real_foo, foo, GLIBC_2_1);
 389    libc_hidden_ver (__real_foo, foo)  */
 390
 391 #if defined SHARED && !defined NO_HIDDEN
 392 # ifndef __ASSEMBLER__
 393 #  define __hidden_proto_hiddenattr(attrs...) \
 394   __attribute__ ((visibility ("hidden"), ##attrs))
 395 #  define hidden_proto(name, attrs...) \
 396   __hidden_proto (name, , __GI_##name, ##attrs)
 397 #  define hidden_tls_proto(name, attrs...) \
 398   __hidden_proto (name, __thread, __GI_##name, ##attrs)
 399 #  define __hidden_proto(name, thread, internal, attrs...)           \
 400   extern thread __typeof (name) name __asm__ (__hidden_asmname (#internal)) \
 401   __hidden_proto_hiddenattr (attrs);
 402 #  define __hidden_asmname(name) \
 403   __hidden_asmname1 (__USER_LABEL_PREFIX__, name)
 404 #  define __hidden_asmname1(prefix, name) __hidden_asmname2(prefix, name)
 405 #  define __hidden_asmname2(prefix, name) #prefix name
 406 #  define __hidden_ver1(local, internal, name) \
 407   extern __typeof (name) __EI_##name __asm__(__hidden_asmname (#internal)); \
 408   extern __typeof (name) __EI_##name \
 409         __attribute__((alias (__hidden_asmname (#local))))
 410 #  define hidden_ver(local, name)       __hidden_ver1(local, __GI_##name, name);
 411 #  define hidden_data_ver(local, name)  hidden_ver(local, name)
 412 #  define hidden_def(name)              __hidden_ver1(__GI_##name, name, name);
 413 #  define hidden_data_def(name)         hidden_def(name)
 414 #  define hidden_weak(name) \
 415         __hidden_ver1(__GI_##name, name, name) __attribute__((weak));
 416 #  define hidden_data_weak(name)        hidden_weak(name)
 417 #  define hidden_nolink(name, lib, version) \
 418   __hidden_nolink1 (__GI_##name, __EI_##name, name, VERSION_##lib##_##version)
 419 #  define __hidden_nolink1(local, internal, name, version) \
 420   __hidden_nolink2 (local, internal, name, version)
 421 #  define __hidden_nolink2(local, internal, name, version) \
 422   extern __typeof (name) internal __attribute__ ((alias (#local))); \
 423   __hidden_nolink3 (local, internal, #name "@" #version)
 424 #  define __hidden_nolink3(local, internal, vername) \
 425   __asm__ (".symver " #internal ", " vername);
 426 # else
 427 /* For assembly, we need to do the opposite of what we do in C:
 428    in assembly gcc __REDIRECT stuff is not in place, so functions
 429    are defined by its normal name and we need to create the
 430    __GI_* alias to it, in C __REDIRECT causes the function definition
 431    to use __GI_* name and we need to add alias to the real name.
 432    There is no reason to use hidden_weak over hidden_def in assembly,
 433    but we provide it for consistency with the C usage.
 434    hidden_proto doesn't make sense for assembly but the equivalent
 435    is to call via the HIDDEN_JUMPTARGET macro instead of JUMPTARGET.  */
 436 #  define hidden_def(name)      strong_alias (name, __GI_##name)
 437 #  define hidden_weak(name)     hidden_def (name)
 438 #  define hidden_ver(local, name) strong_alias (local, __GI_##name)
 439 #  define hidden_data_def(name) strong_data_alias (name, __GI_##name)
 440 #  define hidden_data_weak(name)        hidden_data_def (name)
 441 #  define hidden_data_ver(local, name) strong_data_alias (local, __GI_##name)
 442 #  define HIDDEN_JUMPTARGET(name) __GI_##name
 443 # endif
 444 #else
 445 # ifndef __ASSEMBLER__
 446 #  define hidden_proto(name, attrs...)
 447 #  define hidden_tls_proto(name, attrs...)
 448 # else
 449 #  define HIDDEN_JUMPTARGET(name) JUMPTARGET(name)
 450 # endif /* Not  __ASSEMBLER__ */
 451 # define hidden_weak(name)
 452 # define hidden_def(name)
 453 # define hidden_ver(local, name)
 454 # define hidden_data_weak(name)
 455 # define hidden_data_def(name)
 456 # define hidden_data_ver(local, name)
 457 # define hidden_nolink(name, lib, version)
 458 #endif
 459
 460 #if IS_IN (libc)
 461 # define libc_hidden_proto(name, attrs...) hidden_proto (name, ##attrs)
 462 # define libc_hidden_tls_proto(name, attrs...) hidden_tls_proto (name, ##attrs)
 463 # define libc_hidden_def(name) hidden_def (name)
 464 # define libc_hidden_weak(name) hidden_weak (name)
 465 # ifdef LINK_OBSOLETE_RPC
 466    /* libc_hidden_nolink_sunrpc should only get used in sunrpc code.  */
 467 #  define libc_hidden_nolink_sunrpc(name, version) hidden_def (name)
 468 # else
 469 #  define libc_hidden_nolink_sunrpc(name, version) hidden_nolink (name, libc, version)
 470 # endif
 471 # define libc_hidden_ver(local, name) hidden_ver (local, name)
 472 # define libc_hidden_data_def(name) hidden_data_def (name)
 473 # define libc_hidden_data_weak(name) hidden_data_weak (name)
 474 # define libc_hidden_data_ver(local, name) hidden_data_ver (local, name)
 475 #else
 476 # define libc_hidden_proto(name, attrs...)
 477 # define libc_hidden_tls_proto(name, attrs...)
 478 # define libc_hidden_def(name)
 479 # define libc_hidden_weak(name)
 480 # define libc_hidden_ver(local, name)
 481 # define libc_hidden_data_def(name)
 482 # define libc_hidden_data_weak(name)
 483 # define libc_hidden_data_ver(local, name)
 484 #endif
 485
 486 #if IS_IN (rtld)
 487 # define rtld_hidden_proto(name, attrs...) hidden_proto (name, ##attrs)
 488 # define rtld_hidden_tls_proto(name, attrs...) hidden_tls_proto (name, ##attrs)
 489 # define rtld_hidden_def(name) hidden_def (name)
 490 # define rtld_hidden_weak(name) hidden_weak (name)
 491 # define rtld_hidden_ver(local, name) hidden_ver (local, name)
 492 # define rtld_hidden_data_def(name) hidden_data_def (name)
 493 # define rtld_hidden_data_weak(name) hidden_data_weak (name)
 494 # define rtld_hidden_data_ver(local, name) hidden_data_ver (local, name)
 495 #else
 496 # define rtld_hidden_proto(name, attrs...)
 497 # define rtld_hidden_tls_proto(name, attrs...)
 498 # define rtld_hidden_def(name)
 499 # define rtld_hidden_weak(name)
 500 # define rtld_hidden_ver(local, name)
 501 # define rtld_hidden_data_def(name)
 502 # define rtld_hidden_data_weak(name)
 503 # define rtld_hidden_data_ver(local, name)
 504 #endif
 505
 506 #if IS_IN (libm)
 507 # define libm_hidden_proto(name, attrs...) hidden_proto (name, ##attrs)
 508 # define libm_hidden_tls_proto(name, attrs...) hidden_tls_proto (name, ##attrs)
 509 # define libm_hidden_def(name) hidden_def (name)
 510 # define libm_hidden_weak(name) hidden_weak (name)
 511 # define libm_hidden_ver(local, name) hidden_ver (local, name)
 512 # define libm_hidden_data_def(name) hidden_data_def (name)
 513 # define libm_hidden_data_weak(name) hidden_data_weak (name)
 514 # define libm_hidden_data_ver(local, name) hidden_data_ver (local, name)
 515 #else
 516 # define libm_hidden_proto(name, attrs...)
 517 # define libm_hidden_tls_proto(name, attrs...)
 518 # define libm_hidden_def(name)
 519 # define libm_hidden_weak(name)
 520 # define libm_hidden_ver(local, name)
 521 # define libm_hidden_data_def(name)
 522 # define libm_hidden_data_weak(name)
 523 # define libm_hidden_data_ver(local, name)
 524 #endif
 525
 526 #if IS_IN (libmvec)
 527 # define libmvec_hidden_proto(name, attrs...) hidden_proto (name, ##attrs)
 528 # define libmvec_hidden_tls_proto(name, attrs...) hidden_tls_proto (name, ##attrs)
 529 # define libmvec_hidden_def(name) hidden_def (name)
 530 # define libmvec_hidden_weak(name) hidden_weak (name)
 531 # define libmvec_hidden_ver(local, name) hidden_ver (local, name)
 532 # define libmvec_hidden_data_def(name) hidden_data_def (name)
 533 # define libmvec_hidden_data_weak(name) hidden_data_weak (name)
 534 # define libmvec_hidden_data_ver(local, name) hidden_data_ver (local, name)
 535 #else
 536 # define libmvec_hidden_proto(name, attrs...)
 537 # define libmvec_hidden_tls_proto(name, attrs...)
 538 # define libmvec_hidden_def(name)
 539 # define libmvec_hidden_weak(name)
 540 # define libmvec_hidden_ver(local, name)
 541 # define libmvec_hidden_data_def(name)
 542 # define libmvec_hidden_data_weak(name)
 543 # define libmvec_hidden_data_ver(local, name)
 544 #endif
 545
 546 #if IS_IN (libresolv)
 547 # define libresolv_hidden_proto(name, attrs...) hidden_proto (name, ##attrs)
 548 # define libresolv_hidden_tls_proto(name, attrs...) \
 549   hidden_tls_proto (name, ##attrs)
 550 # define libresolv_hidden_def(name) hidden_def (name)
 551 # define libresolv_hidden_weak(name) hidden_weak (name)
 552 # define libresolv_hidden_ver(local, name) hidden_ver (local, name)
 553 # define libresolv_hidden_data_def(name) hidden_data_def (name)
 554 # define libresolv_hidden_data_weak(name) hidden_data_weak (name)
 555 # define libresolv_hidden_data_ver(local, name) hidden_data_ver (local, name)
 556 #else
 557 # define libresolv_hidden_proto(name, attrs...)
 558 # define libresolv_hidden_tls_proto(name, attrs...)
 559 # define libresolv_hidden_def(name)
 560 # define libresolv_hidden_weak(name)
 561 # define libresolv_hidden_ver(local, name)
 562 # define libresolv_hidden_data_def(name)
 563 # define libresolv_hidden_data_weak(name)
 564 # define libresolv_hidden_data_ver(local, name)
 565 #endif
 566
 567 #if IS_IN (librt)
 568 # define librt_hidden_proto(name, attrs...) hidden_proto (name, ##attrs)
 569 # define librt_hidden_tls_proto(name, attrs...) \
 570   hidden_tls_proto (name, ##attrs)
 571 # define librt_hidden_def(name) hidden_def (name)
 572 # define librt_hidden_weak(name) hidden_weak (name)
 573 # define librt_hidden_ver(local, name) hidden_ver (local, name)
 574 # define librt_hidden_data_def(name) hidden_data_def (name)
 575 # define librt_hidden_data_weak(name) hidden_data_weak (name)
 576 # define librt_hidden_data_ver(local, name) hidden_data_ver (local, name)
 577 #else
 578 # define librt_hidden_proto(name, attrs...)
 579 # define librt_hidden_tls_proto(name, attrs...)
 580 # define librt_hidden_def(name)
 581 # define librt_hidden_weak(name)
 582 # define librt_hidden_ver(local, name)
 583 # define librt_hidden_data_def(name)
 584 # define librt_hidden_data_weak(name)
 585 # define librt_hidden_data_ver(local, name)
 586 #endif
 587
 588 #if IS_IN (libdl)
 589 # define libdl_hidden_proto(name, attrs...) hidden_proto (name, ##attrs)
 590 # define libdl_hidden_tls_proto(name, attrs...) \
 591   hidden_tls_proto (name, ##attrs)
 592 # define libdl_hidden_def(name) hidden_def (name)
 593 # define libdl_hidden_weak(name) hidden_weak (name)
 594 # define libdl_hidden_ver(local, name) hidden_ver (local, name)
 595 # define libdl_hidden_data_def(name) hidden_data_def (name)
 596 # define libdl_hidden_data_weak(name) hidden_data_weak (name)
 597 # define libdl_hidden_data_ver(local, name) hidden_data_ver (local, name)
 598 #else
 599 # define libdl_hidden_proto(name, attrs...)
 600 # define libdl_hidden_tls_proto(name, attrs...)
 601 # define libdl_hidden_def(name)
 602 # define libdl_hidden_weak(name)
 603 # define libdl_hidden_ver(local, name)
 604 # define libdl_hidden_data_def(name)
 605 # define libdl_hidden_data_weak(name)
 606 # define libdl_hidden_data_ver(local, name)
 607 #endif
 608
 609 #if IS_IN (libnss_files)
 610 # define libnss_files_hidden_proto(name, attrs...) hidden_proto (name, ##attrs)
 611 # define libnss_files_hidden_tls_proto(name, attrs...) \
 612   hidden_tls_proto (name, ##attrs)
 613 # define libnss_files_hidden_def(name) hidden_def (name)
 614 # define libnss_files_hidden_weak(name) hidden_weak (name)
 615 # define libnss_files_hidden_ver(local, name) hidden_ver (local, name)
 616 # define libnss_files_hidden_data_def(name) hidden_data_def (name)
 617 # define libnss_files_hidden_data_weak(name) hidden_data_weak (name)
 618 # define libnss_files_hidden_data_ver(local, name) hidden_data_ver(local, name)
 619 #else
 620 # define libnss_files_hidden_proto(name, attrs...)
 621 # define libnss_files_hidden_tls_proto(name, attrs...)
 622 # define libnss_files_hidden_def(name)
 623 # define libnss_files_hidden_weak(name)
 624 # define libnss_files_hidden_ver(local, name)
 625 # define libnss_files_hidden_data_def(name)
 626 # define libnss_files_hidden_data_weak(name)
 627 # define libnss_files_hidden_data_ver(local, name)
 628 #endif
 629
 630 #if IS_IN (libnsl)
 631 # define libnsl_hidden_proto(name, attrs...) hidden_proto (name, ##attrs)
 632 # define libnsl_hidden_tls_proto(name, attrs...) \
 633   hidden_tls_proto (name, ##attrs)
 634 # define libnsl_hidden_def(name) hidden_def (name)
 635 # define libnsl_hidden_weak(name) hidden_weak (name)
 636 # define libnsl_hidden_ver(local, name) hidden_ver (local, name)
 637 # define libnsl_hidden_data_def(name) hidden_data_def (name)
 638 # define libnsl_hidden_data_weak(name) hidden_data_weak (name)
 639 # define libnsl_hidden_data_ver(local, name) hidden_data_ver (local, name)
 640 #else
 641 # define libnsl_hidden_proto(name, attrs...)
 642 # define libnsl_hidden_tls_proto(name, attrs...)
 643 # define libnsl_hidden_def(name)
 644 # define libnsl_hidden_weak(name)
 645 # define libnsl_hidden_ver(local, name)
 646 # define libnsl_hidden_data_def(name)
 647 # define libnsl_hidden_data_weak(name)
 648 # define libnsl_hidden_data_ver(local, name)
 649 #endif
 650
 651 #if IS_IN (libnss_nisplus)
 652 # define libnss_nisplus_hidden_proto(name, attrs...) hidden_proto (name, ##attrs)
 653 # define libnss_nisplus_hidden_tls_proto(name, attrs...) \
 654   hidden_tls_proto (name, ##attrs)
 655 # define libnss_nisplus_hidden_def(name) hidden_def (name)
 656 # define libnss_nisplus_hidden_weak(name) hidden_weak (name)
 657 # define libnss_nisplus_hidden_ver(local, name) hidden_ver (local, name)
 658 # define libnss_nisplus_hidden_data_def(name) hidden_data_def (name)
 659 # define libnss_nisplus_hidden_data_weak(name) hidden_data_weak (name)
 660 # define libnss_nisplus_hidden_data_ver(local, name) hidden_data_ver (local, name)
 661 #else
 662 # define libnss_nisplus_hidden_proto(name, attrs...)
 663 # define libnss_nisplus_hidden_tls_proto(name, attrs...)
 664 # define libnss_nisplus_hidden_def(name)
 665 # define libnss_nisplus_hidden_weak(name)
 666 # define libnss_nisplus_hidden_ver(local, name)
 667 # define libnss_nisplus_hidden_data_def(name)
 668 # define libnss_nisplus_hidden_data_weak(name)
 669 # define libnss_nisplus_hidden_data_ver(local, name)
 670 #endif
 671
 672 #define libc_hidden_builtin_proto(name, attrs...) libc_hidden_proto (name, ##attrs)
 673 #define libc_hidden_builtin_def(name) libc_hidden_def (name)
 674 #define libc_hidden_builtin_weak(name) libc_hidden_weak (name)
 675 #define libc_hidden_builtin_ver(local, name) libc_hidden_ver (local, name)
 676 #ifdef __ASSEMBLER__
 677 # define HIDDEN_BUILTIN_JUMPTARGET(name) HIDDEN_JUMPTARGET(name)
 678 #endif
 679
 680 #if IS_IN (libutil)
 681 # define libutil_hidden_proto(name, attrs...) hidden_proto (name, ##attrs)
 682 # define libutil_hidden_tls_proto(name, attrs...) \
 683   hidden_tls_proto (name, ##attrs)
 684 # define libutil_hidden_def(name) hidden_def (name)
 685 # define libutil_hidden_weak(name) hidden_weak (name)
 686 # define libutil_hidden_ver(local, name) hidden_ver (local, name)
 687 # define libutil_hidden_data_def(name) hidden_data_def (name)
 688 # define libutil_hidden_data_weak(name) hidden_data_weak (name)
 689 # define libutil_hidden_data_ver(local, name) hidden_data_ver (local, name)
 690 #else
 691 # define libutil_hidden_proto(name, attrs...)
 692 # define libutil_hidden_tls_proto(name, attrs...)
 693 # define libutil_hidden_def(name)
 694 # define libutil_hidden_weak(name)
 695 # define libutil_hidden_ver(local, name)
 696 # define libutil_hidden_data_def(name)
 697 # define libutil_hidden_data_weak(name)
 698 # define libutil_hidden_data_ver(local, name)
 699 #endif
 700
 701 /* Get some dirty hacks.  */
 702 #include <symbol-hacks.h>
 703
 704 /* Move compatibility symbols out of the way by placing them all in a
 705    special section.  */
 706 #ifndef __ASSEMBLER__
 707 # define attribute_compat_text_section \
 708     __attribute__ ((section (".text.compat")))
 709 # define attribute_compat_data_section \
 710     __attribute__ ((section (".data.compat")))
 711 #else
 712 # define compat_text_section .section ".text.compat", "ax";
 713 # define compat_data_section .section ".data.compat", "aw";
 714 #endif
 715
 716 /* Marker used for indirection function symbols.  */
 717 #define libc_ifunc(name, expr)                                          \
 718   extern void *name##_ifunc (void) __asm__ (#name);                     \
 719   void *name##_ifunc (void)                                             \
 720   {                                                                     \
 721     INIT_ARCH ();                                                       \
 722     __typeof (name) *res = expr;                                        \
 723     return res;                                                         \
 724   }                                                                     \
 725   __asm__ (".type " #name ", %gnu_indirect_function");
 726
 727 /* The body of the function is supposed to use __get_cpu_features
 728    which will, if necessary, initialize the data first.  */
 729 #define libm_ifunc(name, expr)                                          \
 730   extern void *name##_ifunc (void) __asm__ (#name);                     \
 731   void *name##_ifunc (void)                                             \
 732   {                                                                     \
 733     __typeof (name) *res = expr;                                        \
 734     return res;                                                         \
 735   }                                                                     \
 736   __asm__ (".type " #name ", %gnu_indirect_function");
 737
 738 #ifdef HAVE_ASM_SET_DIRECTIVE
 739 # define libc_ifunc_hidden_def1(local, name)                            \
 740     __asm__ (".globl " #local "\n\t"                                    \
 741              ".hidden " #local "\n\t"                                   \
 742              ".set " #local ", " #name);
 743 #else
 744 # define libc_ifunc_hidden_def1(local, name)                            \
 745     __asm__ (".globl " #local "\n\t"                                    \
 746              ".hidden " #local "\n\t"                                   \
 747              #local " = " #name);
 748 #endif
 749
 750 #define libc_ifunc_hidden_def(name) \
 751   libc_ifunc_hidden_def1 (__GI_##name, name)
 752
 753 /* Add the compiler optimization to inhibit loop transformation to library
 754    calls.  This is used to avoid recursive calls in memset and memmove
 755    default implementations.  */
 756 #ifdef HAVE_CC_INHIBIT_LOOP_TO_LIBCALL
 757 # define inhibit_loop_to_libcall \
 758     __attribute__ ((__optimize__ ("-fno-tree-loop-distribute-patterns")))
 759 #else
 760 # define inhibit_loop_to_libcall
 761 #endif
 762
 763 #endif /* libc-symbols.h */