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 /* Use symbol_version_reference to specify the version a symbol
 286    reference should link to.  Use symbol_version or
 287    default_symbol_version for the definition of a versioned symbol.
 288    The difference is that the latter is a no-op in non-shared
 289    builds.  */
 290 #ifdef __ASSEMBLER__
 291 # define symbol_version_reference(real, name, version) \
 292      .symver real, name##@##version
 293 #else  /* !__ASSEMBLER__ */
 294 # define symbol_version_reference(real, name, version) \
 295   __asm__ (".symver " #real "," #name "@" #version)
 296 #endif
 297
 298 #ifdef SHARED
 299 # define symbol_version(real, name, version) \
 300   symbol_version_reference(real, name, version)
 301 # define default_symbol_version(real, name, version) \
 302      _default_symbol_version(real, name, version)
 303 # ifdef __ASSEMBLER__
 304 #  define _default_symbol_version(real, name, version) \
 305      .symver real, name##@##@##version
 306 # else
 307 #  define _default_symbol_version(real, name, version) \
 308      __asm__ (".symver " #real "," #name "@@" #version)
 309 # endif
 310 #else
 311 # define symbol_version(real, name, version)
 312 # define default_symbol_version(real, name, version) \
 313   strong_alias(real, name)
 314 #endif
 315
 316 #if defined SHARED || defined LIBC_NONSHARED
 317 # define attribute_hidden __attribute__ ((visibility ("hidden")))
 318 #else
 319 # define attribute_hidden
 320 #endif
 321
 322 #define attribute_tls_model_ie __attribute__ ((tls_model ("initial-exec")))
 323
 324 #define attribute_relro __attribute__ ((section (".data.rel.ro")))
 325
 326 /* The following macros are used for PLT bypassing within libc.so
 327    (and if needed other libraries similarly).
 328    First of all, you need to have the function prototyped somewhere,
 329    say in foo/foo.h:
 330
 331    int foo (int __bar);
 332
 333    If calls to foo within libc.so should always go to foo defined in libc.so,
 334    then in include/foo.h you add:
 335
 336    libc_hidden_proto (foo)
 337
 338    line and after the foo function definition:
 339
 340    int foo (int __bar)
 341    {
 342      return __bar;
 343    }
 344    libc_hidden_def (foo)
 345
 346    or
 347
 348    int foo (int __bar)
 349    {
 350      return __bar;
 351    }
 352    libc_hidden_weak (foo)
 353
 354    Similarly for global data.  If references to foo within libc.so should
 355    always go to foo defined in libc.so, then in include/foo.h you add:
 356
 357    libc_hidden_proto (foo)
 358
 359    line and after foo's definition:
 360
 361    int foo = INITIAL_FOO_VALUE;
 362    libc_hidden_data_def (foo)
 363
 364    or
 365
 366    int foo = INITIAL_FOO_VALUE;
 367    libc_hidden_data_weak (foo)
 368
 369    If foo is normally just an alias (strong or weak) to some other function,
 370    you should use the normal strong_alias first, then add libc_hidden_def
 371    or libc_hidden_weak:
 372
 373    int baz (int __bar)
 374    {
 375      return __bar;
 376    }
 377    strong_alias (baz, foo)
 378    libc_hidden_weak (foo)
 379
 380    If the function should be internal to multiple objects, say ld.so and
 381    libc.so, the best way is to use:
 382
 383    #if IS_IN (libc) || IS_IN (rtld)
 384    hidden_proto (foo)
 385    #endif
 386
 387    in include/foo.h and the normal macros at all function definitions
 388    depending on what DSO they belong to.
 389
 390    If versioned_symbol macro is used to define foo,
 391    libc_hidden_ver macro should be used, as in:
 392
 393    int __real_foo (int __bar)
 394    {
 395      return __bar;
 396    }
 397    versioned_symbol (libc, __real_foo, foo, GLIBC_2_1);
 398    libc_hidden_ver (__real_foo, foo)  */
 399
 400 #if defined SHARED && !defined NO_HIDDEN
 401 # ifndef __ASSEMBLER__
 402 #  define __hidden_proto_hiddenattr(attrs...) \
 403   __attribute__ ((visibility ("hidden"), ##attrs))
 404 #  define hidden_proto(name, attrs...) \
 405   __hidden_proto (name, , __GI_##name, ##attrs)
 406 #  define hidden_tls_proto(name, attrs...) \
 407   __hidden_proto (name, __thread, __GI_##name, ##attrs)
 408 #  define __hidden_proto(name, thread, internal, attrs...)           \
 409   extern thread __typeof (name) name __asm__ (__hidden_asmname (#internal)) \
 410   __hidden_proto_hiddenattr (attrs);
 411 #  define __hidden_asmname(name) \
 412   __hidden_asmname1 (__USER_LABEL_PREFIX__, name)
 413 #  define __hidden_asmname1(prefix, name) __hidden_asmname2(prefix, name)
 414 #  define __hidden_asmname2(prefix, name) #prefix name
 415 #  define __hidden_ver1(local, internal, name) \
 416   extern __typeof (name) __EI_##name __asm__(__hidden_asmname (#internal)); \
 417   extern __typeof (name) __EI_##name \
 418         __attribute__((alias (__hidden_asmname (#local))))
 419 #  define hidden_ver(local, name)       __hidden_ver1(local, __GI_##name, name);
 420 #  define hidden_data_ver(local, name)  hidden_ver(local, name)
 421 #  define hidden_def(name)              __hidden_ver1(__GI_##name, name, name);
 422 #  define hidden_data_def(name)         hidden_def(name)
 423 #  define hidden_weak(name) \
 424         __hidden_ver1(__GI_##name, name, name) __attribute__((weak));
 425 #  define hidden_data_weak(name)        hidden_weak(name)
 426 #  define hidden_nolink(name, lib, version) \
 427   __hidden_nolink1 (__GI_##name, __EI_##name, name, VERSION_##lib##_##version)
 428 #  define __hidden_nolink1(local, internal, name, version) \
 429   __hidden_nolink2 (local, internal, name, version)
 430 #  define __hidden_nolink2(local, internal, name, version) \
 431   extern __typeof (name) internal __attribute__ ((alias (#local))); \
 432   __hidden_nolink3 (local, internal, #name "@" #version)
 433 #  define __hidden_nolink3(local, internal, vername) \
 434   __asm__ (".symver " #internal ", " vername);
 435 # else
 436 /* For assembly, we need to do the opposite of what we do in C:
 437    in assembly gcc __REDIRECT stuff is not in place, so functions
 438    are defined by its normal name and we need to create the
 439    __GI_* alias to it, in C __REDIRECT causes the function definition
 440    to use __GI_* name and we need to add alias to the real name.
 441    There is no reason to use hidden_weak over hidden_def in assembly,
 442    but we provide it for consistency with the C usage.
 443    hidden_proto doesn't make sense for assembly but the equivalent
 444    is to call via the HIDDEN_JUMPTARGET macro instead of JUMPTARGET.  */
 445 #  define hidden_def(name)      strong_alias (name, __GI_##name)
 446 #  define hidden_weak(name)     hidden_def (name)
 447 #  define hidden_ver(local, name) strong_alias (local, __GI_##name)
 448 #  define hidden_data_def(name) strong_data_alias (name, __GI_##name)
 449 #  define hidden_data_weak(name)        hidden_data_def (name)
 450 #  define hidden_data_ver(local, name) strong_data_alias (local, __GI_##name)
 451 #  define HIDDEN_JUMPTARGET(name) __GI_##name
 452 # endif
 453 #else
 454 # ifndef __ASSEMBLER__
 455 #  define hidden_proto(name, attrs...)
 456 #  define hidden_tls_proto(name, attrs...)
 457 # else
 458 #  define HIDDEN_JUMPTARGET(name) JUMPTARGET(name)
 459 # endif /* Not  __ASSEMBLER__ */
 460 # define hidden_weak(name)
 461 # define hidden_def(name)
 462 # define hidden_ver(local, name)
 463 # define hidden_data_weak(name)
 464 # define hidden_data_def(name)
 465 # define hidden_data_ver(local, name)
 466 # define hidden_nolink(name, lib, version)
 467 #endif
 468
 469 #if IS_IN (libc)
 470 # define libc_hidden_proto(name, attrs...) hidden_proto (name, ##attrs)
 471 # define libc_hidden_tls_proto(name, attrs...) hidden_tls_proto (name, ##attrs)
 472 # define libc_hidden_def(name) hidden_def (name)
 473 # define libc_hidden_weak(name) hidden_weak (name)
 474 # ifdef LINK_OBSOLETE_RPC
 475    /* libc_hidden_nolink_sunrpc should only get used in sunrpc code.  */
 476 #  define libc_hidden_nolink_sunrpc(name, version) hidden_def (name)
 477 # else
 478 #  define libc_hidden_nolink_sunrpc(name, version) hidden_nolink (name, libc, version)
 479 # endif
 480 # define libc_hidden_ver(local, name) hidden_ver (local, name)
 481 # define libc_hidden_data_def(name) hidden_data_def (name)
 482 # define libc_hidden_data_weak(name) hidden_data_weak (name)
 483 # define libc_hidden_data_ver(local, name) hidden_data_ver (local, name)
 484 #else
 485 # define libc_hidden_proto(name, attrs...)
 486 # define libc_hidden_tls_proto(name, attrs...)
 487 # define libc_hidden_def(name)
 488 # define libc_hidden_weak(name)
 489 # define libc_hidden_ver(local, name)
 490 # define libc_hidden_data_def(name)
 491 # define libc_hidden_data_weak(name)
 492 # define libc_hidden_data_ver(local, name)
 493 #endif
 494
 495 #if IS_IN (rtld)
 496 # define rtld_hidden_proto(name, attrs...) hidden_proto (name, ##attrs)
 497 # define rtld_hidden_tls_proto(name, attrs...) hidden_tls_proto (name, ##attrs)
 498 # define rtld_hidden_def(name) hidden_def (name)
 499 # define rtld_hidden_weak(name) hidden_weak (name)
 500 # define rtld_hidden_ver(local, name) hidden_ver (local, name)
 501 # define rtld_hidden_data_def(name) hidden_data_def (name)
 502 # define rtld_hidden_data_weak(name) hidden_data_weak (name)
 503 # define rtld_hidden_data_ver(local, name) hidden_data_ver (local, name)
 504 #else
 505 # define rtld_hidden_proto(name, attrs...)
 506 # define rtld_hidden_tls_proto(name, attrs...)
 507 # define rtld_hidden_def(name)
 508 # define rtld_hidden_weak(name)
 509 # define rtld_hidden_ver(local, name)
 510 # define rtld_hidden_data_def(name)
 511 # define rtld_hidden_data_weak(name)
 512 # define rtld_hidden_data_ver(local, name)
 513 #endif
 514
 515 #if IS_IN (libm)
 516 # define libm_hidden_proto(name, attrs...) hidden_proto (name, ##attrs)
 517 # define libm_hidden_tls_proto(name, attrs...) hidden_tls_proto (name, ##attrs)
 518 # define libm_hidden_def(name) hidden_def (name)
 519 # define libm_hidden_weak(name) hidden_weak (name)
 520 # define libm_hidden_ver(local, name) hidden_ver (local, name)
 521 # define libm_hidden_data_def(name) hidden_data_def (name)
 522 # define libm_hidden_data_weak(name) hidden_data_weak (name)
 523 # define libm_hidden_data_ver(local, name) hidden_data_ver (local, name)
 524 #else
 525 # define libm_hidden_proto(name, attrs...)
 526 # define libm_hidden_tls_proto(name, attrs...)
 527 # define libm_hidden_def(name)
 528 # define libm_hidden_weak(name)
 529 # define libm_hidden_ver(local, name)
 530 # define libm_hidden_data_def(name)
 531 # define libm_hidden_data_weak(name)
 532 # define libm_hidden_data_ver(local, name)
 533 #endif
 534
 535 #if IS_IN (libmvec)
 536 # define libmvec_hidden_proto(name, attrs...) hidden_proto (name, ##attrs)
 537 # define libmvec_hidden_tls_proto(name, attrs...) hidden_tls_proto (name, ##attrs)
 538 # define libmvec_hidden_def(name) hidden_def (name)
 539 # define libmvec_hidden_weak(name) hidden_weak (name)
 540 # define libmvec_hidden_ver(local, name) hidden_ver (local, name)
 541 # define libmvec_hidden_data_def(name) hidden_data_def (name)
 542 # define libmvec_hidden_data_weak(name) hidden_data_weak (name)
 543 # define libmvec_hidden_data_ver(local, name) hidden_data_ver (local, name)
 544 #else
 545 # define libmvec_hidden_proto(name, attrs...)
 546 # define libmvec_hidden_tls_proto(name, attrs...)
 547 # define libmvec_hidden_def(name)
 548 # define libmvec_hidden_weak(name)
 549 # define libmvec_hidden_ver(local, name)
 550 # define libmvec_hidden_data_def(name)
 551 # define libmvec_hidden_data_weak(name)
 552 # define libmvec_hidden_data_ver(local, name)
 553 #endif
 554
 555 #if IS_IN (libresolv)
 556 # define libresolv_hidden_proto(name, attrs...) hidden_proto (name, ##attrs)
 557 # define libresolv_hidden_tls_proto(name, attrs...) \
 558   hidden_tls_proto (name, ##attrs)
 559 # define libresolv_hidden_def(name) hidden_def (name)
 560 # define libresolv_hidden_weak(name) hidden_weak (name)
 561 # define libresolv_hidden_ver(local, name) hidden_ver (local, name)
 562 # define libresolv_hidden_data_def(name) hidden_data_def (name)
 563 # define libresolv_hidden_data_weak(name) hidden_data_weak (name)
 564 # define libresolv_hidden_data_ver(local, name) hidden_data_ver (local, name)
 565 #else
 566 # define libresolv_hidden_proto(name, attrs...)
 567 # define libresolv_hidden_tls_proto(name, attrs...)
 568 # define libresolv_hidden_def(name)
 569 # define libresolv_hidden_weak(name)
 570 # define libresolv_hidden_ver(local, name)
 571 # define libresolv_hidden_data_def(name)
 572 # define libresolv_hidden_data_weak(name)
 573 # define libresolv_hidden_data_ver(local, name)
 574 #endif
 575
 576 #if IS_IN (librt)
 577 # define librt_hidden_proto(name, attrs...) hidden_proto (name, ##attrs)
 578 # define librt_hidden_tls_proto(name, attrs...) \
 579   hidden_tls_proto (name, ##attrs)
 580 # define librt_hidden_def(name) hidden_def (name)
 581 # define librt_hidden_weak(name) hidden_weak (name)
 582 # define librt_hidden_ver(local, name) hidden_ver (local, name)
 583 # define librt_hidden_data_def(name) hidden_data_def (name)
 584 # define librt_hidden_data_weak(name) hidden_data_weak (name)
 585 # define librt_hidden_data_ver(local, name) hidden_data_ver (local, name)
 586 #else
 587 # define librt_hidden_proto(name, attrs...)
 588 # define librt_hidden_tls_proto(name, attrs...)
 589 # define librt_hidden_def(name)
 590 # define librt_hidden_weak(name)
 591 # define librt_hidden_ver(local, name)
 592 # define librt_hidden_data_def(name)
 593 # define librt_hidden_data_weak(name)
 594 # define librt_hidden_data_ver(local, name)
 595 #endif
 596
 597 #if IS_IN (libdl)
 598 # define libdl_hidden_proto(name, attrs...) hidden_proto (name, ##attrs)
 599 # define libdl_hidden_tls_proto(name, attrs...) \
 600   hidden_tls_proto (name, ##attrs)
 601 # define libdl_hidden_def(name) hidden_def (name)
 602 # define libdl_hidden_weak(name) hidden_weak (name)
 603 # define libdl_hidden_ver(local, name) hidden_ver (local, name)
 604 # define libdl_hidden_data_def(name) hidden_data_def (name)
 605 # define libdl_hidden_data_weak(name) hidden_data_weak (name)
 606 # define libdl_hidden_data_ver(local, name) hidden_data_ver (local, name)
 607 #else
 608 # define libdl_hidden_proto(name, attrs...)
 609 # define libdl_hidden_tls_proto(name, attrs...)
 610 # define libdl_hidden_def(name)
 611 # define libdl_hidden_weak(name)
 612 # define libdl_hidden_ver(local, name)
 613 # define libdl_hidden_data_def(name)
 614 # define libdl_hidden_data_weak(name)
 615 # define libdl_hidden_data_ver(local, name)
 616 #endif
 617
 618 #if IS_IN (libnss_files)
 619 # define libnss_files_hidden_proto(name, attrs...) hidden_proto (name, ##attrs)
 620 # define libnss_files_hidden_tls_proto(name, attrs...) \
 621   hidden_tls_proto (name, ##attrs)
 622 # define libnss_files_hidden_def(name) hidden_def (name)
 623 # define libnss_files_hidden_weak(name) hidden_weak (name)
 624 # define libnss_files_hidden_ver(local, name) hidden_ver (local, name)
 625 # define libnss_files_hidden_data_def(name) hidden_data_def (name)
 626 # define libnss_files_hidden_data_weak(name) hidden_data_weak (name)
 627 # define libnss_files_hidden_data_ver(local, name) hidden_data_ver(local, name)
 628 #else
 629 # define libnss_files_hidden_proto(name, attrs...)
 630 # define libnss_files_hidden_tls_proto(name, attrs...)
 631 # define libnss_files_hidden_def(name)
 632 # define libnss_files_hidden_weak(name)
 633 # define libnss_files_hidden_ver(local, name)
 634 # define libnss_files_hidden_data_def(name)
 635 # define libnss_files_hidden_data_weak(name)
 636 # define libnss_files_hidden_data_ver(local, name)
 637 #endif
 638
 639 #if IS_IN (libnsl)
 640 # define libnsl_hidden_proto(name, attrs...) hidden_proto (name, ##attrs)
 641 # define libnsl_hidden_tls_proto(name, attrs...) \
 642   hidden_tls_proto (name, ##attrs)
 643 # define libnsl_hidden_def(name) hidden_def (name)
 644 # define libnsl_hidden_weak(name) hidden_weak (name)
 645 # define libnsl_hidden_ver(local, name) hidden_ver (local, name)
 646 # define libnsl_hidden_data_def(name) hidden_data_def (name)
 647 # define libnsl_hidden_data_weak(name) hidden_data_weak (name)
 648 # define libnsl_hidden_data_ver(local, name) hidden_data_ver (local, name)
 649 #else
 650 # define libnsl_hidden_proto(name, attrs...)
 651 # define libnsl_hidden_tls_proto(name, attrs...)
 652 # define libnsl_hidden_def(name)
 653 # define libnsl_hidden_weak(name)
 654 # define libnsl_hidden_ver(local, name)
 655 # define libnsl_hidden_data_def(name)
 656 # define libnsl_hidden_data_weak(name)
 657 # define libnsl_hidden_data_ver(local, name)
 658 #endif
 659
 660 #if IS_IN (libnss_nisplus)
 661 # define libnss_nisplus_hidden_proto(name, attrs...) hidden_proto (name, ##attrs)
 662 # define libnss_nisplus_hidden_tls_proto(name, attrs...) \
 663   hidden_tls_proto (name, ##attrs)
 664 # define libnss_nisplus_hidden_def(name) hidden_def (name)
 665 # define libnss_nisplus_hidden_weak(name) hidden_weak (name)
 666 # define libnss_nisplus_hidden_ver(local, name) hidden_ver (local, name)
 667 # define libnss_nisplus_hidden_data_def(name) hidden_data_def (name)
 668 # define libnss_nisplus_hidden_data_weak(name) hidden_data_weak (name)
 669 # define libnss_nisplus_hidden_data_ver(local, name) hidden_data_ver (local, name)
 670 #else
 671 # define libnss_nisplus_hidden_proto(name, attrs...)
 672 # define libnss_nisplus_hidden_tls_proto(name, attrs...)
 673 # define libnss_nisplus_hidden_def(name)
 674 # define libnss_nisplus_hidden_weak(name)
 675 # define libnss_nisplus_hidden_ver(local, name)
 676 # define libnss_nisplus_hidden_data_def(name)
 677 # define libnss_nisplus_hidden_data_weak(name)
 678 # define libnss_nisplus_hidden_data_ver(local, name)
 679 #endif
 680
 681 #define libc_hidden_builtin_proto(name, attrs...) libc_hidden_proto (name, ##attrs)
 682 #define libc_hidden_builtin_def(name) libc_hidden_def (name)
 683 #define libc_hidden_builtin_weak(name) libc_hidden_weak (name)
 684 #define libc_hidden_builtin_ver(local, name) libc_hidden_ver (local, name)
 685 #ifdef __ASSEMBLER__
 686 # define HIDDEN_BUILTIN_JUMPTARGET(name) HIDDEN_JUMPTARGET(name)
 687 #endif
 688
 689 #if IS_IN (libutil)
 690 # define libutil_hidden_proto(name, attrs...) hidden_proto (name, ##attrs)
 691 # define libutil_hidden_tls_proto(name, attrs...) \
 692   hidden_tls_proto (name, ##attrs)
 693 # define libutil_hidden_def(name) hidden_def (name)
 694 # define libutil_hidden_weak(name) hidden_weak (name)
 695 # define libutil_hidden_ver(local, name) hidden_ver (local, name)
 696 # define libutil_hidden_data_def(name) hidden_data_def (name)
 697 # define libutil_hidden_data_weak(name) hidden_data_weak (name)
 698 # define libutil_hidden_data_ver(local, name) hidden_data_ver (local, name)
 699 #else
 700 # define libutil_hidden_proto(name, attrs...)
 701 # define libutil_hidden_tls_proto(name, attrs...)
 702 # define libutil_hidden_def(name)
 703 # define libutil_hidden_weak(name)
 704 # define libutil_hidden_ver(local, name)
 705 # define libutil_hidden_data_def(name)
 706 # define libutil_hidden_data_weak(name)
 707 # define libutil_hidden_data_ver(local, name)
 708 #endif
 709
 710 /* Get some dirty hacks.  */
 711 #include <symbol-hacks.h>
 712
 713 /* Move compatibility symbols out of the way by placing them all in a
 714    special section.  */
 715 #ifndef __ASSEMBLER__
 716 # define attribute_compat_text_section \
 717     __attribute__ ((section (".text.compat")))
 718 # define attribute_compat_data_section \
 719     __attribute__ ((section (".data.compat")))
 720 #else
 721 # define compat_text_section .section ".text.compat", "ax";
 722 # define compat_data_section .section ".data.compat", "aw";
 723 #endif
 724
 725 /* Marker used for indirection function symbols.  */
 726 #define libc_ifunc(name, expr)                                          \
 727   extern void *name##_ifunc (void) __asm__ (#name);                     \
 728   void *name##_ifunc (void)                                             \
 729   {                                                                     \
 730     INIT_ARCH ();                                                       \
 731     __typeof (name) *res = expr;                                        \
 732     return res;                                                         \
 733   }                                                                     \
 734   __asm__ (".type " #name ", %gnu_indirect_function");
 735
 736 /* The body of the function is supposed to use __get_cpu_features
 737    which will, if necessary, initialize the data first.  */
 738 #define libm_ifunc(name, expr)                                          \
 739   extern void *name##_ifunc (void) __asm__ (#name);                     \
 740   void *name##_ifunc (void)                                             \
 741   {                                                                     \
 742     __typeof (name) *res = expr;                                        \
 743     return res;                                                         \
 744   }                                                                     \
 745   __asm__ (".type " #name ", %gnu_indirect_function");
 746
 747 #ifdef HAVE_ASM_SET_DIRECTIVE
 748 # define libc_ifunc_hidden_def1(local, name)                            \
 749     __asm__ (".globl " #local "\n\t"                                    \
 750              ".hidden " #local "\n\t"                                   \
 751              ".set " #local ", " #name);
 752 #else
 753 # define libc_ifunc_hidden_def1(local, name)                            \
 754     __asm__ (".globl " #local "\n\t"                                    \
 755              ".hidden " #local "\n\t"                                   \
 756              #local " = " #name);
 757 #endif
 758
 759 #define libc_ifunc_hidden_def(name) \
 760   libc_ifunc_hidden_def1 (__GI_##name, name)
 761
 762 /* Add the compiler optimization to inhibit loop transformation to library
 763    calls.  This is used to avoid recursive calls in memset and memmove
 764    default implementations.  */
 765 #ifdef HAVE_CC_INHIBIT_LOOP_TO_LIBCALL
 766 # define inhibit_loop_to_libcall \
 767     __attribute__ ((__optimize__ ("-fno-tree-loop-distribute-patterns")))
 768 #else
 769 # define inhibit_loop_to_libcall
 770 #endif
 771
 772 #endif /* libc-symbols.h */