include/libc-symbols.h

   1 /* Support macros for making weak and strong aliases for symbols,
   2    and for using symbol sets and linker warnings with GNU ld.
   3    Copyright (C) 1995-1998,2000-2003,2004,2005,2006
   4         Free Software Foundation, Inc.
   5    This file is part of the GNU C Library.
   6
   7    The GNU C Library is free software; you can redistribute it and/or
   8    modify it under the terms of the GNU Lesser General Public
   9    License as published by the Free Software Foundation; either
  10    version 2.1 of the License, or (at your option) any later version.
  11
  12    The GNU C Library is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15    Lesser General Public License for more details.
  16
  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.  */
  21
  22 #ifndef _LIBC_SYMBOLS_H
  23 #define _LIBC_SYMBOLS_H 1
  24
  25 /* This is defined for the compilation of all C library code.  features.h
  26    tests this to avoid inclusion of stubs.h while compiling the library,
  27    before stubs.h has been generated.  Some library code that is shared
  28    with other packages also tests this symbol to see if it is being
  29    compiled as part of the C library.  We must define this before including
  30    config.h, because it makes some definitions conditional on whether libc
  31    itself is being compiled, or just some generator program.  */
  32 #define _LIBC   1
  33
  34
  35 /* This file's macros are included implicitly in the compilation of every
  36    file in the C library by -imacros.
  37
  38    We include uClibc_arch_features.h which is defined by arch devs.
  39    It should define for us the following symbols:
  40
  41    * HAVE_ASM_SET_DIRECTIVE if we have `.set B, A' instead of `A = B'.
  42    * ASM_GLOBAL_DIRECTIVE with `.globl' or `.global'.
  43    * ASM_TYPE_DIRECTIVE_PREFIX with `@' or `#' or whatever for .type,
  44      or leave it undefined if there is no .type directive.
  45    * HAVE_ELF if using ELF, which supports weak symbols using `.weak'.
  46    * HAVE_ASM_WEAK_DIRECTIVE if we have weak symbols using `.weak'.
  47    * HAVE_ASM_WEAKEXT_DIRECTIVE if we have weak symbols using `.weakext'.
  48
  49    */
  50
  51 #include <bits/uClibc_arch_features.h>
  52
  53 /* Enable declarations of GNU extensions, since we are compiling them.  */
  54 #define _GNU_SOURCE     1
  55
  56 /* Prepare for the case that `__builtin_expect' is not available.  */
  57 #if defined __GNUC__ && __GNUC__ == 2 && __GNUC_MINOR__ < 96
  58 # define __builtin_expect(x, expected_value) (x)
  59 #endif
  60 #ifndef likely
  61 # define likely(x)      __builtin_expect((!!(x)),1)
  62 #endif
  63 #ifndef unlikely
  64 # define unlikely(x)    __builtin_expect((!!(x)),0)
  65 #endif
  66 #if defined __GNUC__ && (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3))
  67 # ifndef __cold
  68 #  define __cold __attribute__ ((__cold__))
  69 # endif
  70 # ifndef __hot
  71 #  define __hot __attribute__ ((__hot__))
  72 # endif
  73 #else
  74 # ifndef __cold
  75 #  define __cold
  76 # endif
  77 # ifndef __hot
  78 #  define __hot
  79 # endif
  80 #endif
  81 #ifndef __LINUX_COMPILER_H
  82 # define __LINUX_COMPILER_H
  83 #endif
  84 #ifndef __cast__
  85 # define __cast__(_to)
  86 #endif
  87
  88 #define attribute_unused __attribute__ ((unused))
  89
  90 #if defined __GNUC__ || defined __ICC
  91 # define attribute_noreturn __attribute__ ((__noreturn__))
  92 #else
  93 # define attribute_noreturn
  94 #endif
  95
  96 #ifndef NOT_IN_libc
  97 # define IS_IN_libc 1
  98 #endif
  99
 100 /* Indirect stringification.  Doing two levels allows
 101  * the parameter to be a macro itself.
 102  */
 103 #define __stringify_1(x)    #x
 104 #define __stringify(x)      __stringify_1(x)
 105
 106 #ifdef __UCLIBC_HAVE_ASM_SET_DIRECTIVE__
 107 # define HAVE_ASM_SET_DIRECTIVE
 108 #else
 109 # undef HAVE_ASM_SET_DIRECTIVE
 110 #endif
 111
 112 #ifdef __UCLIBC_ASM_GLOBAL_DIRECTIVE__
 113 # define ASM_GLOBAL_DIRECTIVE __UCLIBC_ASM_GLOBAL_DIRECTIVE__
 114 #else
 115 # define ASM_GLOBAL_DIRECTIVE .global
 116 #endif
 117
 118 #ifdef __UCLIBC_HAVE_ASM_WEAK_DIRECTIVE__
 119 # define HAVE_ASM_WEAK_DIRECTIVE
 120 #else
 121 # undef HAVE_ASM_WEAK_DIRECTIVE
 122 #endif
 123
 124 #ifdef __UCLIBC_HAVE_ASM_WEAKEXT_DIRECTIVE__
 125 # define HAVE_ASM_WEAKEXT_DIRECTIVE
 126 #else
 127 # undef HAVE_ASM_WEAKEXT_DIRECTIVE
 128 #endif
 129
 130 #ifdef __UCLIBC_HAVE_ASM_GLOBAL_DOT_NAME__
 131 # define HAVE_ASM_GLOBAL_DOT_NAME
 132 #else
 133 # undef HAVE_ASM_GLOBAL_DOT_NAME
 134 #endif
 135
 136 #ifdef __UCLIBC_HAVE_ASM_CFI_DIRECTIVES__
 137 # define HAVE_ASM_CFI_DIRECTIVES
 138 #else
 139 # undef HAVE_ASM_CFI_DIRECTIVES
 140 #endif
 141
 142 #if defined HAVE_ASM_WEAK_DIRECTIVE || defined HAVE_ASM_WEAKEXT_DIRECTIVE
 143 # define HAVE_WEAK_SYMBOLS
 144 #endif
 145
 146 #undef C_SYMBOL_NAME
 147 #ifndef C_SYMBOL_NAME
 148 # ifndef __UCLIBC_UNDERSCORES__
 149 #  define C_SYMBOL_NAME(name) name
 150 # else
 151 #  define C_SYMBOL_NAME(name) _##name
 152 # endif
 153 #endif
 154
 155 #ifdef __UCLIBC_ASM_LINE_SEP__
 156 # define ASM_LINE_SEP __UCLIBC_ASM_LINE_SEP__
 157 #else
 158 # define ASM_LINE_SEP ;
 159 #endif
 160
 161 #ifdef HAVE_ASM_GLOBAL_DOT_NAME
 162 # ifndef C_SYMBOL_DOT_NAME
 163 #  if defined __GNUC__ && defined __GNUC_MINOR__ \
 164       && (__GNUC__ << 16) + __GNUC_MINOR__ >= (3 << 16) + 1
 165 #   define C_SYMBOL_DOT_NAME(name) .name
 166 #  else
 167 #   define C_SYMBOL_DOT_NAME(name) .##name
 168 #  endif
 169 # endif
 170 #endif
 171
 172 #ifndef __ASSEMBLER__
 173 /* GCC understands weak symbols and aliases; use its interface where
 174    possible, instead of embedded assembly language.  */
 175
 176 /* Define ALIASNAME as a strong alias for NAME.  */
 177 # define strong_alias(name, aliasname) _strong_alias(name, aliasname)
 178 # define _strong_alias(name, aliasname) \
 179   extern __typeof (name) aliasname __attribute__ ((alias (#name)));
 180
 181 /* This comes between the return type and function name in
 182    a function definition to make that definition weak.  */
 183 # define weak_function __attribute__ ((weak))
 184 # define weak_const_function __attribute__ ((weak, __const__))
 185
 186 # ifdef HAVE_WEAK_SYMBOLS
 187
 188 /* Define ALIASNAME as a weak alias for NAME.
 189    If weak aliases are not available, this defines a strong alias.  */
 190 #  define weak_alias(name, aliasname) _weak_alias (name, aliasname)
 191 #  define _weak_alias(name, aliasname) \
 192   extern __typeof (name) aliasname __attribute__ ((weak, alias (#name)));
 193
 194 /* Declare SYMBOL as weak undefined symbol (resolved to 0 if not defined).  */
 195 #  define weak_extern(symbol) _weak_extern (weak symbol)
 196 #  define _weak_extern(expr) _Pragma (#expr)
 197
 198 # else
 199
 200 #  define weak_alias(name, aliasname) strong_alias(name, aliasname)
 201 #  define weak_extern(symbol) /* Nothing. */
 202
 203 # endif
 204
 205 #else /* __ASSEMBLER__ */
 206
 207 # ifdef HAVE_ASM_SET_DIRECTIVE
 208 #  ifdef HAVE_ASM_GLOBAL_DOT_NAME
 209 #   define strong_alias(original, alias) \
 210         ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(alias)               ASM_LINE_SEP \
 211         .set    C_SYMBOL_NAME(alias),C_SYMBOL_NAME(original)    ASM_LINE_SEP \
 212         ASM_GLOBAL_DIRECTIVE C_SYMBOL_DOT_NAME(alias)           ASM_LINE_SEP \
 213         .set    C_SYMBOL_DOT_NAME(alias),C_SYMBOL_DOT_NAME(original)
 214 #   define strong_data_alias(original, alias) \
 215         ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(alias)               ASM_LINE_SEP \
 216         .set    C_SYMBOL_NAME(alias),C_SYMBOL_NAME(original)
 217 #  else
 218 #   define strong_alias(original, alias) \
 219         ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(alias)               ASM_LINE_SEP \
 220         .set    C_SYMBOL_NAME(alias),C_SYMBOL_NAME(original)
 221 #   define strong_data_alias(original, alias) strong_alias(original, alias)
 222 #  endif
 223 # else
 224 #  ifdef HAVE_ASM_GLOBAL_DOT_NAME
 225 #   define strong_alias(original, alias) \
 226         ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(alias)               ASM_LINE_SEP \
 227         C_SYMBOL_NAME(alias) = C_SYMBOL_NAME(original)          ASM_LINE_SEP \
 228         ASM_GLOBAL_DIRECTIVE C_SYMBOL_DOT_NAME(alias)           ASM_LINE_SEP \
 229         C_SYMBOL_DOT_NAME(alias) = C_SYMBOL_DOT_NAME(original)
 230 #   define strong_data_alias(original, alias) \
 231         ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(alias)               ASM_LINE_SEP \
 232         C_SYMBOL_NAME(alias) = C_SYMBOL_NAME(original)
 233 #  else
 234 #   define strong_alias(original, alias) \
 235         ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(alias)               ASM_LINE_SEP \
 236         C_SYMBOL_NAME(alias) = C_SYMBOL_NAME(original)
 237 #   define strong_data_alias(original, alias) strong_alias(original, alias)
 238 #  endif
 239 # endif
 240
 241 # ifdef HAVE_WEAK_SYMBOLS
 242 #  ifdef HAVE_ASM_WEAKEXT_DIRECTIVE
 243 #   ifdef HAVE_ASM_GLOBAL_DOT_NAME
 244 #    define weak_alias(original, alias) \
 245         .weakext C_SYMBOL_NAME(alias),C_SYMBOL_NAME(original)   ASM_LINE_SEP \
 246         .weakext C_SYMBOL_DOT_NAME(alias),C_SYMBOL_DOT_NAME(original)
 247 #   else
 248 #    define weak_alias(original, alias) \
 249         .weakext C_SYMBOL_NAME(alias),C_SYMBOL_NAME(original)
 250 #   endif
 251 #   define weak_extern(symbol) \
 252         .weakext C_SYMBOL_NAME(symbol)
 253
 254 #  else /* ! HAVE_ASM_WEAKEXT_DIRECTIVE */
 255
 256 #   ifdef HAVE_ASM_SET_DIRECTIVE
 257 #    ifdef HAVE_ASM_GLOBAL_DOT_NAME
 258 #     define weak_alias(original, alias) \
 259         .weak   C_SYMBOL_NAME(alias)                            ASM_LINE_SEP \
 260         .set    C_SYMBOL_NAME(alias),C_SYMBOL_NAME(original)    ASM_LINE_SEP \
 261         .weak   C_SYMBOL_DOT_NAME(alias)                        ASM_LINE_SEP \
 262         .set    C_SYMBOL_DOT_NAME(alias),C_SYMBOL_DOT_NAME(original)
 263 #    else
 264 #     define weak_alias(original, alias) \
 265         .weak   C_SYMBOL_NAME(alias)                            ASM_LINE_SEP \
 266         .set    C_SYMBOL_NAME(alias),C_SYMBOL_NAME(original)
 267 #    endif
 268 #   else /* ! HAVE_ASM_SET_DIRECTIVE */
 269 #    ifdef HAVE_ASM_GLOBAL_DOT_NAME
 270 #     define weak_alias(original, alias) \
 271         .weak   C_SYMBOL_NAME(alias)                            ASM_LINE_SEP \
 272         C_SYMBOL_NAME(alias) = C_SYMBOL_NAME(original)          ASM_LINE_SEP \
 273         .weak   C_SYMBOL_DOT_NAME(alias)                        ASM_LINE_SEP \
 274         C_SYMBOL_DOT_NAME(alias) = C_SYMBOL_DOT_NAME(original)
 275 #    else
 276 #     define weak_alias(original, alias) \
 277         .weak   C_SYMBOL_NAME(alias)                            ASM_LINE_SEP \
 278         C_SYMBOL_NAME(alias) = C_SYMBOL_NAME(original)
 279 #    endif
 280 #   endif
 281 #   define weak_extern(symbol) \
 282         .weak   C_SYMBOL_NAME(symbol)
 283
 284 #  endif /* ! HAVE_ASM_WEAKEXT_DIRECTIVE */
 285
 286 # else /* ! HAVE_WEAK_SYMBOLS */
 287
 288 #  define weak_alias(original, alias) strong_alias(original, alias)
 289 #  define weak_extern(symbol) /* Nothing */
 290 # endif /* ! HAVE_WEAK_SYMBOLS */
 291
 292 #endif /* __ASSEMBLER__ */
 293
 294
 295 /* On some platforms we can make internal function calls (i.e., calls of
 296    functions not exported) a bit faster by using a different calling
 297    convention.  */
 298 #ifndef internal_function
 299 # define internal_function      /* empty */
 300 #endif
 301
 302
 303 /* We want the .gnu.warning.SYMBOL section to be unallocated.  */
 304 #define __make_section_unallocated(section_string)      \
 305   __asm__ (".section " section_string "\n\t.previous");
 306
 307
 308 /* Tacking on "\n#APP\n\t#" to the section name makes gcc put it's bogus
 309    section attributes on what looks like a comment to the assembler.  */
 310 #ifdef __sparc__ /* HAVE_SECTION_QUOTES */
 311 # define __sec_comment "\"\n#APP\n\t#\""
 312 #else
 313 # define __sec_comment "\n#APP\n\t#"
 314 #endif
 315
 316
 317 /* When a reference to SYMBOL is encountered, the linker will emit a
 318    warning message MSG.  */
 319 #define link_warning(symbol, msg) \
 320   __make_section_unallocated (".gnu.warning." #symbol) \
 321   static const char __evoke_link_warning_##symbol[]     \
 322     __attribute__ ((used, section (".gnu.warning." #symbol __sec_comment))) \
 323     = msg;
 324
 325 /* Handling on non-exported internal names.  We have to do this only
 326    for shared code.  */
 327 #ifdef SHARED
 328 # define INTUSE(name) name##_internal
 329 # define INTDEF(name) strong_alias (name, name##_internal)
 330 # define INTVARDEF(name) _INTVARDEF (name, name##_internal)
 331 # if defined HAVE_VISIBILITY_ATTRIBUTE
 332 #  define _INTVARDEF(name, aliasname) \
 333   extern __typeof (name) aliasname __attribute__ ((alias (#name), \
 334                                                    visibility ("hidden")));
 335 # else
 336 #  define _INTVARDEF(name, aliasname) \
 337   extern __typeof (name) aliasname __attribute__ ((alias (#name)));
 338 # endif
 339 # define INTDEF2(name, newname) strong_alias (name, newname##_internal)
 340 # define INTVARDEF2(name, newname) _INTVARDEF (name, newname##_internal)
 341 #else
 342 # define INTUSE(name) name
 343 # define INTDEF(name)
 344 # define INTVARDEF(name)
 345 # define INTDEF2(name, newname)
 346 # define INTVARDEF2(name, newname)
 347 #endif
 348
 349
 350 /* The following macros are used for PLT bypassing within libc.so
 351    (and if needed other libraries similarly).
 352
 353    If calls to foo within libc.so should always go to foo defined in libc.so,
 354    then in include/foo.h you add:
 355
 356    int foo(int __bar);
 357    libc_hidden_proto(foo)
 358
 359    line and after the foo function definition:
 360
 361    int foo(int __bar) {
 362      return __bar;
 363    }
 364    libc_hidden_def(foo)
 365
 366    or
 367
 368    int foo(int __bar) {
 369      return __bar;
 370    }
 371    libc_hidden_weak(foo)
 372
 373    Similarly for global data: if references to foo within libc.so
 374    should always go to foo defined in libc.so, then in include/foo.h:
 375
 376    extern int foo;
 377    libc_hidden_proto(foo)
 378
 379    and after foo's definition:
 380
 381    int foo = INITIAL_FOO_VALUE;
 382    libc_hidden_data_def(foo)
 383
 384    or
 385
 386    int foo = INITIAL_FOO_VALUE;
 387    libc_hidden_data_weak(foo)
 388
 389    If foo is normally just an alias (strong or weak) to some other function,
 390    you should use the normal strong_alias first, then add libc_hidden_def
 391    or libc_hidden_weak:
 392
 393    int baz(int __bar) {
 394      return __bar;
 395    }
 396    strong_alias(baz, foo)
 397    libc_hidden_weak(foo)
 398
 399    If the function should be internal to multiple objects, say ld.so and
 400    libc.so, the best way is to use:
 401
 402    #if !defined NOT_IN_libc || defined IS_IN_rtld
 403    hidden_proto(foo)
 404    #endif
 405
 406    in include/foo.h and the normal macros at all function definitions
 407    depending on what DSO they belong to.
 408
 409    If versioned_symbol macro is used to define foo,
 410    libc_hidden_ver macro should be used, as in:
 411
 412    int __real_foo(int __bar) {
 413      return __bar;
 414    }
 415    versioned_symbol(libc, __real_foo, foo, GLIBC_2_1);
 416    libc_hidden_ver(__real_foo, foo)
 417  */
 418
 419 /* uClibc specific (the above comment was copied from glibc):
 420  *
 421  * when ppc64 will be supported, we need changes to support
 422  * strong_data_alias (used by asm hidden_data_def)
 423  *
 424  * no versioning support, hidden[_data]_ver are noop
 425  *
 426  * hidden_def() in asm is _hidden_strong_alias (not strong_alias)
 427  *
 428  * libc_hidden_proto(foo) should be added after declaration
 429  * in the header, or after extern foo... in all source files
 430  * (this is discouraged).
 431  * libc_hidden_def does not hide __GI_foo itself, although the name
 432  * suggests it (hiding is done exclusively by libc_hidden_proto).
 433
 434 FIXME! - ?
 435  * The reasoning to have it after the header w/ foo's prototype is
 436  * to get first the __REDIRECT from original header and then create
 437  * the __GI_foo alias
 438
 439  * Hunt for references which still go through PLT (example for x86):
 440  * build shared lib, then disassemble it and search for <xxx@plt>:
 441  * $ objdump -drx libuClibc-*.so >disasm.txt
 442  * $ grep -F '@plt>:' disasm.txt
 443  *
 444  * In uclibc, malloc/free and related functions should be called
 445  * through PLT (making it possible to use alternative malloc),
 446  * and possibly some __pthread_xxx functions can be called through PLT
 447  * (why?). The rest should not use PLT.
 448  */
 449
 450 #if (defined __GNUC__ && defined __GNUC_MINOR__ \
 451         && (( __GNUC__ >= 3 && __GNUC_MINOR__ >= 3) || __GNUC__ >= 4) \
 452     ) || defined __ICC
 453 # define attribute_hidden __attribute__ ((visibility ("hidden")))
 454 # define __hidden_proto_hiddenattr(attrs...) __attribute__ ((visibility ("hidden"), ##attrs))
 455 #else
 456 # define attribute_hidden
 457 # define __hidden_proto_hiddenattr(attrs...)
 458 #endif
 459
 460 #if /*!defined STATIC &&*/ !defined __BCC__
 461
 462 # ifndef __ASSEMBLER__
 463 #  define hidden_proto(name, attrs...) __hidden_proto(name, __GI_##name, ##attrs)
 464 #  define __hidden_proto(name, internal, attrs...) \
 465         extern __typeof (name) name __asm__ (__hidden_asmname (#internal)) \
 466         __hidden_proto_hiddenattr (attrs);
 467 #  define __hidden_asmname(name) __hidden_asmname1 (__USER_LABEL_PREFIX__, name)
 468 #  define __hidden_asmname1(prefix, name) __hidden_asmname2(prefix, name)
 469 #  define __hidden_asmname2(prefix, name) #prefix name
 470 #  define __hidden_ver1(local, internal, name) \
 471         extern __typeof (name) __EI_##name __asm__(__hidden_asmname (#internal)); \
 472         extern __typeof (name) __EI_##name __attribute__((alias (__hidden_asmname1 (,#local))))
 473 #  define hidden_ver(local, name)       __hidden_ver1(local, __GI_##name, name);
 474 #  define hidden_data_ver(local, name)  hidden_ver(local, name)
 475 #  define hidden_def(name)              __hidden_ver1(__GI_##name, name, name);
 476 #  define hidden_data_def(name)         hidden_def(name)
 477 #  define hidden_weak(name) \
 478         __hidden_ver1(__GI_##name, name, name) __attribute__((weak));
 479 #  define hidden_data_weak(name)        hidden_weak(name)
 480
 481 # else /* __ASSEMBLER__ */
 482
 483 #  ifdef HAVE_ASM_SET_DIRECTIVE
 484 #   ifdef HAVE_ASM_GLOBAL_DOT_NAME
 485 #    define _hidden_strong_alias(original, alias) \
 486         ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(alias)               ASM_LINE_SEP \
 487         .hidden C_SYMBOL_NAME(alias)                            ASM_LINE_SEP \
 488         .set    C_SYMBOL_NAME(alias),C_SYMBOL_NAME(original)    ASM_LINE_SEP \
 489         ASM_GLOBAL_DIRECTIVE C_SYMBOL_DOT_NAME(alias)           ASM_LINE_SEP \
 490         .hidden C_SYMBOL_DOT_NAME(alias)                        ASM_LINE_SEP \
 491         .set    C_SYMBOL_DOT_NAME(alias),C_SYMBOL_DOT_NAME(original)
 492 #   else
 493 #    define _hidden_strong_alias(original, alias) \
 494         ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(alias)               ASM_LINE_SEP \
 495         .hidden C_SYMBOL_NAME(alias)                            ASM_LINE_SEP \
 496         .set    C_SYMBOL_NAME(alias),C_SYMBOL_NAME(original)
 497 #   endif
 498 #  else /* dont have .set directive */
 499 #   ifdef HAVE_ASM_GLOBAL_DOT_NAME
 500 #    define _hidden_strong_alias(original, alias) \
 501         ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(alias)               ASM_LINE_SEP \
 502         .hidden C_SYMBOL_NAME(alias)                            ASM_LINE_SEP \
 503         C_SYMBOL_NAME(alias) = C_SYMBOL_NAME(original)          ASM_LINE_SEP \
 504         ASM_GLOBAL_DIRECTIVE C_SYMBOL_DOT_NAME(alias)           ASM_LINE_SEP \
 505         .hidden C_SYMBOL_DOT_NAME(alias)                        ASM_LINE_SEP \
 506         C_SYMBOL_DOT_NAME(alias) = C_SYMBOL_DOT_NAME(original)
 507 #   else
 508 #    define _hidden_strong_alias(original, alias) \
 509         ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(alias)               ASM_LINE_SEP \
 510         .hidden C_SYMBOL_NAME(alias)                            ASM_LINE_SEP \
 511         C_SYMBOL_NAME(alias) = C_SYMBOL_NAME(original)
 512 #   endif
 513 #  endif
 514
 515 #  ifdef HAVE_ASM_GLOBAL_DOT_NAME
 516 #   define _hidden_weak_alias(original, alias) \
 517         .hidden C_SYMBOL_NAME(alias)                            ASM_LINE_SEP \
 518         .hidden C_SYMBOL_DOT_NAME(alias)                        ASM_LINE_SEP \
 519         weak_alias(original, alias)
 520 #  else
 521 #   define _hidden_weak_alias(original, alias) \
 522         .hidden C_SYMBOL_NAME(alias)                            ASM_LINE_SEP \
 523         weak_alias(original, alias)
 524 #  endif
 525
 526 /* For assembly, we need to do the opposite of what we do in C:
 527    in assembly gcc __REDIRECT stuff is not in place, so functions
 528    are defined by its normal name and we need to create the
 529    __GI_* alias to it, in C __REDIRECT causes the function definition
 530    to use __GI_* name and we need to add alias to the real name.
 531    There is no reason to use hidden_weak over hidden_def in assembly,
 532    but we provide it for consistency with the C usage.
 533    hidden_proto doesn't make sense for assembly but the equivalent
 534    is to call via the HIDDEN_JUMPTARGET macro instead of JUMPTARGET.  */
 535 #  define hidden_def(name)      _hidden_strong_alias (name, __GI_##name)
 536 #  define hidden_weak(name)     _hidden_weak_alias (name, __GI_##name)
 537 #  define hidden_ver(local, name) strong_alias (local, __GI_##name)
 538 #  define hidden_data_def(name) _hidden_strong_alias (name, __GI_##name)
 539 #  define hidden_data_weak(name)        _hidden_weak_alias (name, __GI_##name)
 540 #  define hidden_data_ver(local, name) strong_data_alias (local, __GI_##name)
 541 #  ifdef HAVE_ASM_GLOBAL_DOT_NAME
 542 #   define HIDDEN_JUMPTARGET(name) .__GI_##name
 543 #  else
 544 #   define HIDDEN_JUMPTARGET(name) __GI_##name
 545 #  endif
 546 # endif /* __ASSEMBLER__ */
 547
 548 #else /* not SHARED */
 549
 550 # ifndef __ASSEMBLER__
 551 #  define hidden_proto(name, attrs...)
 552 # else
 553 #  define HIDDEN_JUMPTARGET(name) name
 554 # endif /* not __ASSEMBLER__ */
 555 # define hidden_weak(name)
 556 # define hidden_def(name)
 557 # define hidden_ver(local, name)
 558 # define hidden_data_weak(name)
 559 # define hidden_data_def(name)
 560 # define hidden_data_ver(local, name)
 561
 562 #endif /* SHARED / not SHARED */
 563
 564
 565 /* uClibc does not support versioning yet. */
 566 #define versioned_symbol(lib, local, symbol, version) /* weak_alias(local, symbol) */
 567 #undef hidden_ver
 568 #define hidden_ver(local, name) /* strong_alias(local, __GI_##name) */
 569 #undef hidden_data_ver
 570 #define hidden_data_ver(local, name) /* strong_alias(local,__GI_##name) */
 571
 572 #if !defined NOT_IN_libc
 573 # define libc_hidden_proto(name, attrs...) hidden_proto (name, ##attrs)
 574 # define libc_hidden_def(name) hidden_def (name)
 575 # define libc_hidden_weak(name) hidden_weak (name)
 576 # define libc_hidden_ver(local, name) hidden_ver (local, name)
 577 # define libc_hidden_data_def(name) hidden_data_def (name)
 578 # define libc_hidden_data_weak(name) hidden_data_weak (name)
 579 # define libc_hidden_data_ver(local, name) hidden_data_ver (local, name)
 580 #else
 581 # define libc_hidden_proto(name, attrs...)
 582 # define libc_hidden_def(name)
 583 # define libc_hidden_weak(name)
 584 # define libc_hidden_ver(local, name)
 585 # define libc_hidden_data_def(name)
 586 # define libc_hidden_data_weak(name)
 587 # define libc_hidden_data_ver(local, name)
 588 #endif
 589
 590 #if defined NOT_IN_libc && defined IS_IN_rtld
 591 # define rtld_hidden_proto(name, attrs...) hidden_proto (name, ##attrs)
 592 # define rtld_hidden_def(name) hidden_def (name)
 593 # define rtld_hidden_weak(name) hidden_weak (name)
 594 # define rtld_hidden_ver(local, name) hidden_ver (local, name)
 595 # define rtld_hidden_data_def(name) hidden_data_def (name)
 596 # define rtld_hidden_data_weak(name) hidden_data_weak (name)
 597 # define rtld_hidden_data_ver(local, name) hidden_data_ver (local, name)
 598 #else
 599 # define rtld_hidden_proto(name, attrs...)
 600 # define rtld_hidden_def(name)
 601 # define rtld_hidden_weak(name)
 602 # define rtld_hidden_ver(local, name)
 603 # define rtld_hidden_data_def(name)
 604 # define rtld_hidden_data_weak(name)
 605 # define rtld_hidden_data_ver(local, name)
 606 #endif
 607
 608 #if defined NOT_IN_libc && defined IS_IN_libm
 609 # define libm_hidden_proto(name, attrs...) hidden_proto (name, ##attrs)
 610 # define libm_hidden_def(name) hidden_def (name)
 611 # define libm_hidden_weak(name) hidden_weak (name)
 612 # define libm_hidden_ver(local, name) hidden_ver (local, name)
 613 # define libm_hidden_data_def(name) hidden_data_def (name)
 614 # define libm_hidden_data_weak(name) hidden_data_weak (name)
 615 # define libm_hidden_data_ver(local, name) hidden_data_ver (local, name)
 616 #else
 617 # define libm_hidden_proto(name, attrs...)
 618 # define libm_hidden_def(name)
 619 # define libm_hidden_weak(name)
 620 # define libm_hidden_ver(local, name)
 621 # define libm_hidden_data_def(name)
 622 # define libm_hidden_data_weak(name)
 623 # define libm_hidden_data_ver(local, name)
 624 #endif
 625
 626 #if defined NOT_IN_libc && defined IS_IN_libresolv
 627 # define libresolv_hidden_proto(name, attrs...) hidden_proto (name, ##attrs)
 628 # define libresolv_hidden_def(name) hidden_def (name)
 629 # define libresolv_hidden_weak(name) hidden_weak (name)
 630 # define libresolv_hidden_ver(local, name) hidden_ver (local, name)
 631 # define libresolv_hidden_data_def(name) hidden_data_def (name)
 632 # define libresolv_hidden_data_weak(name) hidden_data_weak (name)
 633 # define libresolv_hidden_data_ver(local, name) hidden_data_ver (local, name)
 634 #else
 635 # define libresolv_hidden_proto(name, attrs...)
 636 # define libresolv_hidden_def(name)
 637 # define libresolv_hidden_weak(name)
 638 # define libresolv_hidden_ver(local, name)
 639 # define libresolv_hidden_data_def(name)
 640 # define libresolv_hidden_data_weak(name)
 641 # define libresolv_hidden_data_ver(local, name)
 642 #endif
 643
 644 #if defined NOT_IN_libc && defined IS_IN_librt
 645 # define librt_hidden_proto(name, attrs...) hidden_proto (name, ##attrs)
 646 # define librt_hidden_def(name) hidden_def (name)
 647 # define librt_hidden_weak(name) hidden_weak (name)
 648 # define librt_hidden_ver(local, name) hidden_ver (local, name)
 649 # define librt_hidden_data_def(name) hidden_data_def (name)
 650 # define librt_hidden_data_weak(name) hidden_data_weak (name)
 651 # define librt_hidden_data_ver(local, name) hidden_data_ver (local, name)
 652 #else
 653 # define librt_hidden_proto(name, attrs...)
 654 # define librt_hidden_def(name)
 655 # define librt_hidden_weak(name)
 656 # define librt_hidden_ver(local, name)
 657 # define librt_hidden_data_def(name)
 658 # define librt_hidden_data_weak(name)
 659 # define librt_hidden_data_ver(local, name)
 660 #endif
 661
 662 #if defined NOT_IN_libc && defined IS_IN_libdl
 663 # define libdl_hidden_proto(name, attrs...) hidden_proto (name, ##attrs)
 664 # define libdl_hidden_def(name) hidden_def (name)
 665 # define libdl_hidden_weak(name) hidden_weak (name)
 666 # define libdl_hidden_ver(local, name) hidden_ver (local, name)
 667 # define libdl_hidden_data_def(name) hidden_data_def (name)
 668 # define libdl_hidden_data_weak(name) hidden_data_weak (name)
 669 # define libdl_hidden_data_ver(local, name) hidden_data_ver (local, name)
 670 #else
 671 # define libdl_hidden_proto(name, attrs...)
 672 # define libdl_hidden_def(name)
 673 # define libdl_hidden_weak(name)
 674 # define libdl_hidden_ver(local, name)
 675 # define libdl_hidden_data_def(name)
 676 # define libdl_hidden_data_weak(name)
 677 # define libdl_hidden_data_ver(local, name)
 678 #endif
 679
 680 #if defined NOT_IN_libc && defined IS_IN_libintl
 681 # define libintl_hidden_proto(name, attrs...) hidden_proto (name, ##attrs)
 682 # define libintl_hidden_def(name) hidden_def (name)
 683 # define libintl_hidden_weak(name) hidden_weak (name)
 684 # define libintl_hidden_ver(local, name) hidden_ver (local, name)
 685 # define libintl_hidden_data_def(name) hidden_data_def (name)
 686 # define libintl_hidden_data_weak(name) hidden_data_weak (name)
 687 # define libintl_hidden_data_ver(local, name) hidden_data_ver(local, name)
 688 #else
 689 # define libintl_hidden_proto(name, attrs...)
 690 # define libintl_hidden_def(name)
 691 # define libintl_hidden_weak(name)
 692 # define libintl_hidden_ver(local, name)
 693 # define libintl_hidden_data_def(name)
 694 # define libintl_hidden_data_weak(name)
 695 # define libintl_hidden_data_ver(local, name)
 696 #endif
 697
 698 #if defined NOT_IN_libc && defined IS_IN_libnsl
 699 # define libnsl_hidden_proto(name, attrs...) hidden_proto (name, ##attrs)
 700 # define libnsl_hidden_def(name) hidden_def (name)
 701 # define libnsl_hidden_weak(name) hidden_weak (name)
 702 # define libnsl_hidden_ver(local, name) hidden_ver (local, name)
 703 # define libnsl_hidden_data_def(name) hidden_data_def (name)
 704 # define libnsl_hidden_data_weak(name) hidden_data_weak (name)
 705 # define libnsl_hidden_data_ver(local, name) hidden_data_ver (local, name)
 706 #else
 707 # define libnsl_hidden_proto(name, attrs...)
 708 # define libnsl_hidden_def(name)
 709 # define libnsl_hidden_weak(name)
 710 # define libnsl_hidden_ver(local, name)
 711 # define libnsl_hidden_data_def(name)
 712 # define libnsl_hidden_data_weak(name)
 713 # define libnsl_hidden_data_ver(local, name)
 714 #endif
 715
 716 #if defined NOT_IN_libc && defined IS_IN_libutil
 717 # define libutil_hidden_proto(name, attrs...) hidden_proto (name, ##attrs)
 718 # define libutil_hidden_def(name) hidden_def (name)
 719 # define libutil_hidden_weak(name) hidden_weak (name)
 720 # define libutil_hidden_ver(local, name) hidden_ver (local, name)
 721 # define libutil_hidden_data_def(name) hidden_data_def (name)
 722 # define libutil_hidden_data_weak(name) hidden_data_weak (name)
 723 # define libutil_hidden_data_ver(local, name) hidden_data_ver (local, name)
 724 #else
 725 # define libutil_hidden_proto(name, attrs...)
 726 # define libutil_hidden_def(name)
 727 # define libutil_hidden_weak(name)
 728 # define libutil_hidden_ver(local, name)
 729 # define libutil_hidden_data_def(name)
 730 # define libutil_hidden_data_weak(name)
 731 # define libutil_hidden_data_ver(local, name)
 732 #endif
 733
 734 #if defined NOT_IN_libc && defined IS_IN_libcrypt
 735 # define libcrypt_hidden_proto(name, attrs...) hidden_proto (name, ##attrs)
 736 # define libcrypt_hidden_def(name) hidden_def (name)
 737 # define libcrypt_hidden_weak(name) hidden_weak (name)
 738 # define libcrypt_hidden_ver(local, name) hidden_ver (local, name)
 739 # define libcrypt_hidden_data_def(name) hidden_data_def (name)
 740 # define libcrypt_hidden_data_weak(name) hidden_data_weak (name)
 741 # define libcrypt_hidden_data_ver(local, name) hidden_data_ver (local, name)
 742 #else
 743 # define libcrypt_hidden_proto(name, attrs...)
 744 # define libcrypt_hidden_def(name)
 745 # define libcrypt_hidden_weak(name)
 746 # define libcrypt_hidden_ver(local, name)
 747 # define libcrypt_hidden_data_def(name)
 748 # define libcrypt_hidden_data_weak(name)
 749 # define libcrypt_hidden_data_ver(local, name)
 750 #endif
 751
 752 #if defined NOT_IN_libc && defined IS_IN_libpthread
 753 # define libpthread_hidden_proto(name, attrs...) hidden_proto (name, ##attrs)
 754 # define libpthread_hidden_def(name) hidden_def (name)
 755 # define libpthread_hidden_weak(name) hidden_weak (name)
 756 # define libpthread_hidden_ver(local, name) hidden_ver (local, name)
 757 # define libpthread_hidden_data_def(name) hidden_data_def (name)
 758 # define libpthread_hidden_data_weak(name) hidden_data_weak (name)
 759 # define libpthread_hidden_data_ver(local, name) hidden_data_ver (local, name)
 760 #else
 761 # define libpthread_hidden_proto(name, attrs...)
 762 # define libpthread_hidden_def(name)
 763 # define libpthread_hidden_weak(name)
 764 # define libpthread_hidden_ver(local, name)
 765 # define libpthread_hidden_data_def(name)
 766 # define libpthread_hidden_data_weak(name)
 767 # define libpthread_hidden_data_ver(local, name)
 768 #endif
 769
 770 #endif /* libc-symbols.h */