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 #if defined __GNUC__ && (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 4))
  89 # define attribute_optimize(x) __attribute__ ((optimize(x)))
  90 #else
  91 # define attribute_optimize(x)
  92 #endif
  93
  94 #define attribute_unused __attribute__ ((unused))
  95
  96 #if defined __GNUC__ || defined __ICC
  97 # define attribute_noreturn __attribute__ ((__noreturn__))
  98 #else
  99 # define attribute_noreturn
 100 #endif
 101
 102 #define libc_freeres_ptr(decl) \
 103       __make_section_unallocated ("__libc_freeres_ptrs, \"aw\", %nobits") \
 104   decl __attribute__ ((section ("__libc_freeres_ptrs" __sec_comment)))
 105 #define __libc_freeres_fn_section \
 106       __attribute__ ((section ("__libc_freeres_fn")))
 107
 108 #ifndef NOT_IN_libc
 109 # define IS_IN_libc 1
 110 #endif
 111
 112 /* Indirect stringification.  Doing two levels allows
 113  * the parameter to be a macro itself.
 114  */
 115 #define __stringify_1(x)    #x
 116 #define __stringify(x)      __stringify_1(x)
 117
 118 #ifdef __UCLIBC_HAVE_ASM_SET_DIRECTIVE__
 119 # define HAVE_ASM_SET_DIRECTIVE
 120 #else
 121 # undef HAVE_ASM_SET_DIRECTIVE
 122 #endif
 123
 124 #ifdef __UCLIBC_ASM_GLOBAL_DIRECTIVE__
 125 # define ASM_GLOBAL_DIRECTIVE __UCLIBC_ASM_GLOBAL_DIRECTIVE__
 126 #else
 127 # define ASM_GLOBAL_DIRECTIVE .global
 128 #endif
 129
 130 #ifdef __UCLIBC_HAVE_ASM_WEAK_DIRECTIVE__
 131 # define HAVE_ASM_WEAK_DIRECTIVE
 132 #else
 133 # undef HAVE_ASM_WEAK_DIRECTIVE
 134 #endif
 135
 136 #ifdef __UCLIBC_HAVE_ASM_WEAKEXT_DIRECTIVE__
 137 # define HAVE_ASM_WEAKEXT_DIRECTIVE
 138 #else
 139 # undef HAVE_ASM_WEAKEXT_DIRECTIVE
 140 #endif
 141
 142 #ifdef __UCLIBC_HAVE_ASM_GLOBAL_DOT_NAME__
 143 # define HAVE_ASM_GLOBAL_DOT_NAME
 144 #else
 145 # undef HAVE_ASM_GLOBAL_DOT_NAME
 146 #endif
 147
 148 #ifdef __UCLIBC_HAVE_ASM_CFI_DIRECTIVES__
 149 # define HAVE_ASM_CFI_DIRECTIVES
 150 #else
 151 # undef HAVE_ASM_CFI_DIRECTIVES
 152 #endif
 153
 154 #if defined HAVE_ASM_WEAK_DIRECTIVE || defined HAVE_ASM_WEAKEXT_DIRECTIVE
 155 # define HAVE_WEAK_SYMBOLS
 156 #endif
 157
 158 #undef C_SYMBOL_NAME
 159 #ifndef C_SYMBOL_NAME
 160 # ifndef __UCLIBC_UNDERSCORES__
 161 #  define C_SYMBOL_NAME(name) name
 162 # else
 163 #  define C_SYMBOL_NAME(name) _##name
 164 # endif
 165 #endif
 166
 167 #ifdef __UCLIBC_ASM_LINE_SEP__
 168 # define ASM_LINE_SEP __UCLIBC_ASM_LINE_SEP__
 169 #else
 170 # define ASM_LINE_SEP ;
 171 #endif
 172
 173 #ifdef HAVE_ASM_GLOBAL_DOT_NAME
 174 # ifndef C_SYMBOL_DOT_NAME
 175 #  if defined __GNUC__ && defined __GNUC_MINOR__ \
 176       && (__GNUC__ << 16) + __GNUC_MINOR__ >= (3 << 16) + 1
 177 #   define C_SYMBOL_DOT_NAME(name) .name
 178 #  else
 179 #   define C_SYMBOL_DOT_NAME(name) .##name
 180 #  endif
 181 # endif
 182 #endif
 183
 184 #ifndef __ASSEMBLER__
 185 /* GCC understands weak symbols and aliases; use its interface where
 186    possible, instead of embedded assembly language.  */
 187
 188 /* Define ALIASNAME as a strong alias for NAME.  */
 189 # define strong_alias(name, aliasname) _strong_alias(name, aliasname)
 190 # define _strong_alias(name, aliasname) \
 191   extern __typeof (name) aliasname __attribute__ ((alias (#name)));
 192 /* Same, but does not check for type match. Use sparingly.
 193    Example: strong_alias(stat,stat64) may fail, this one works: */
 194 # define strong_alias_untyped(name, aliasname) \
 195   _strong_alias_untyped(name, aliasname)
 196 # define _strong_alias_untyped(name, aliasname) \
 197   extern __typeof (aliasname) aliasname __attribute__ ((alias (#name)));
 198
 199 /* This comes between the return type and function name in
 200    a function definition to make that definition weak.  */
 201 # define weak_function __attribute__ ((weak))
 202 # define weak_const_function __attribute__ ((weak, __const__))
 203
 204 # ifdef HAVE_WEAK_SYMBOLS
 205
 206 /* Define ALIASNAME as a weak alias for NAME.
 207    If weak aliases are not available, this defines a strong alias.  */
 208 #  define weak_alias(name, aliasname) _weak_alias (name, aliasname)
 209 #  define _weak_alias(name, aliasname) \
 210   extern __typeof (name) aliasname __attribute__ ((weak, alias (#name)));
 211
 212 /* Declare SYMBOL as weak undefined symbol (resolved to 0 if not defined).  */
 213 #  define weak_extern(symbol) _weak_extern (weak symbol)
 214 #  define _weak_extern(expr) _Pragma (#expr)
 215
 216 # else
 217
 218 #  define weak_alias(name, aliasname) strong_alias(name, aliasname)
 219 #  define weak_extern(symbol) /* Nothing. */
 220
 221 # endif
 222
 223 #else /* __ASSEMBLER__ */
 224
 225 # ifdef HAVE_ASM_SET_DIRECTIVE
 226 #  ifdef HAVE_ASM_GLOBAL_DOT_NAME
 227 #   define strong_alias(original, alias) \
 228         ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(alias)               ASM_LINE_SEP \
 229         .set    C_SYMBOL_NAME(alias),C_SYMBOL_NAME(original)    ASM_LINE_SEP \
 230         ASM_GLOBAL_DIRECTIVE C_SYMBOL_DOT_NAME(alias)           ASM_LINE_SEP \
 231         .set    C_SYMBOL_DOT_NAME(alias),C_SYMBOL_DOT_NAME(original)
 232 #   define strong_data_alias(original, alias) \
 233         ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(alias)               ASM_LINE_SEP \
 234         .set    C_SYMBOL_NAME(alias),C_SYMBOL_NAME(original)
 235 #  else
 236 #   define strong_alias(original, alias) \
 237         ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(alias)               ASM_LINE_SEP \
 238         .set    C_SYMBOL_NAME(alias),C_SYMBOL_NAME(original)
 239 #   define strong_data_alias(original, alias) strong_alias(original, alias)
 240 #  endif
 241 # else
 242 #  ifdef HAVE_ASM_GLOBAL_DOT_NAME
 243 #   define strong_alias(original, alias) \
 244         ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(alias)               ASM_LINE_SEP \
 245         C_SYMBOL_NAME(alias) = C_SYMBOL_NAME(original)          ASM_LINE_SEP \
 246         ASM_GLOBAL_DIRECTIVE C_SYMBOL_DOT_NAME(alias)           ASM_LINE_SEP \
 247         C_SYMBOL_DOT_NAME(alias) = C_SYMBOL_DOT_NAME(original)
 248 #   define strong_data_alias(original, alias) \
 249         ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(alias)               ASM_LINE_SEP \
 250         C_SYMBOL_NAME(alias) = C_SYMBOL_NAME(original)
 251 #  else
 252 #   define strong_alias(original, alias) \
 253         ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(alias)               ASM_LINE_SEP \
 254         C_SYMBOL_NAME(alias) = C_SYMBOL_NAME(original)
 255 #   define strong_data_alias(original, alias) strong_alias(original, alias)
 256 #  endif
 257 # endif
 258
 259 # ifdef HAVE_WEAK_SYMBOLS
 260 #  ifdef HAVE_ASM_WEAKEXT_DIRECTIVE
 261 #   ifdef HAVE_ASM_GLOBAL_DOT_NAME
 262 #    define weak_alias(original, alias) \
 263         .weakext C_SYMBOL_NAME(alias),C_SYMBOL_NAME(original)   ASM_LINE_SEP \
 264         .weakext C_SYMBOL_DOT_NAME(alias),C_SYMBOL_DOT_NAME(original)
 265 #   else
 266 #    define weak_alias(original, alias) \
 267         .weakext C_SYMBOL_NAME(alias),C_SYMBOL_NAME(original)
 268 #   endif
 269 #   define weak_extern(symbol) \
 270         .weakext C_SYMBOL_NAME(symbol)
 271
 272 #  else /* ! HAVE_ASM_WEAKEXT_DIRECTIVE */
 273
 274 #   ifdef HAVE_ASM_SET_DIRECTIVE
 275 #    ifdef HAVE_ASM_GLOBAL_DOT_NAME
 276 #     define weak_alias(original, alias) \
 277         .weak   C_SYMBOL_NAME(alias)                            ASM_LINE_SEP \
 278         .set    C_SYMBOL_NAME(alias),C_SYMBOL_NAME(original)    ASM_LINE_SEP \
 279         .weak   C_SYMBOL_DOT_NAME(alias)                        ASM_LINE_SEP \
 280         .set    C_SYMBOL_DOT_NAME(alias),C_SYMBOL_DOT_NAME(original)
 281 #    else
 282 #     define weak_alias(original, alias) \
 283         .weak   C_SYMBOL_NAME(alias)                            ASM_LINE_SEP \
 284         .set    C_SYMBOL_NAME(alias),C_SYMBOL_NAME(original)
 285 #    endif
 286 #   else /* ! HAVE_ASM_SET_DIRECTIVE */
 287 #    ifdef HAVE_ASM_GLOBAL_DOT_NAME
 288 #     define weak_alias(original, alias) \
 289         .weak   C_SYMBOL_NAME(alias)                            ASM_LINE_SEP \
 290         C_SYMBOL_NAME(alias) = C_SYMBOL_NAME(original)          ASM_LINE_SEP \
 291         .weak   C_SYMBOL_DOT_NAME(alias)                        ASM_LINE_SEP \
 292         C_SYMBOL_DOT_NAME(alias) = C_SYMBOL_DOT_NAME(original)
 293 #    else
 294 #     define weak_alias(original, alias) \
 295         .weak   C_SYMBOL_NAME(alias)                            ASM_LINE_SEP \
 296         C_SYMBOL_NAME(alias) = C_SYMBOL_NAME(original)
 297 #    endif
 298 #   endif
 299 #   define weak_extern(symbol) \
 300         .weak   C_SYMBOL_NAME(symbol)
 301
 302 #  endif /* ! HAVE_ASM_WEAKEXT_DIRECTIVE */
 303
 304 # else /* ! HAVE_WEAK_SYMBOLS */
 305
 306 #  define weak_alias(original, alias) strong_alias(original, alias)
 307 #  define weak_extern(symbol) /* Nothing */
 308 # endif /* ! HAVE_WEAK_SYMBOLS */
 309
 310 #endif /* __ASSEMBLER__ */
 311
 312
 313 /* On some platforms we can make internal function calls (i.e., calls of
 314    functions not exported) a bit faster by using a different calling
 315    convention.  */
 316 #ifndef internal_function
 317 # define internal_function      /* empty */
 318 #endif
 319
 320
 321 /* We want the .gnu.warning.SYMBOL section to be unallocated.  */
 322 #define __make_section_unallocated(section_string)      \
 323   __asm__ (".section " section_string "\n\t.previous");
 324
 325
 326 /* Tacking on "\n#APP\n\t#" to the section name makes gcc put it's bogus
 327    section attributes on what looks like a comment to the assembler.  */
 328 #ifdef __sparc__ /* HAVE_SECTION_QUOTES */
 329 # define __sec_comment "\"\n#APP\n\t#\""
 330 #else
 331 # define __sec_comment "\n#APP\n\t#"
 332 #endif
 333
 334
 335 /* When a reference to SYMBOL is encountered, the linker will emit a
 336    warning message MSG.  */
 337 #define link_warning(symbol, msg) \
 338   __make_section_unallocated (".gnu.warning." #symbol) \
 339   static const char __evoke_link_warning_##symbol[]     \
 340     __attribute__ ((used, section (".gnu.warning." #symbol __sec_comment))) \
 341     = msg;
 342
 343 /* Handling on non-exported internal names.  We have to do this only
 344    for shared code.  */
 345 #ifdef SHARED
 346 # define INTUSE(name) name##_internal
 347 # define INTDEF(name) strong_alias (name, name##_internal)
 348 # define INTVARDEF(name) _INTVARDEF (name, name##_internal)
 349 # if defined HAVE_VISIBILITY_ATTRIBUTE
 350 #  define _INTVARDEF(name, aliasname) \
 351   extern __typeof (name) aliasname __attribute__ ((alias (#name), \
 352                                                    visibility ("hidden")));
 353 # else
 354 #  define _INTVARDEF(name, aliasname) \
 355   extern __typeof (name) aliasname __attribute__ ((alias (#name)));
 356 # endif
 357 # define INTDEF2(name, newname) strong_alias (name, newname##_internal)
 358 # define INTVARDEF2(name, newname) _INTVARDEF (name, newname##_internal)
 359 #else
 360 # define INTUSE(name) name
 361 # define INTDEF(name)
 362 # define INTVARDEF(name)
 363 # define INTDEF2(name, newname)
 364 # define INTVARDEF2(name, newname)
 365 #endif
 366
 367
 368 /* The following macros are used for PLT bypassing within libc.so
 369    (and if needed other libraries similarly).
 370
 371    If calls to foo within libc.so should always go to foo defined in libc.so,
 372    then in include/foo.h you add:
 373
 374    int foo(int __bar);
 375    libc_hidden_proto(foo)
 376
 377    line and after the foo function definition:
 378
 379    int foo(int __bar) {
 380      return __bar;
 381    }
 382    libc_hidden_def(foo)
 383
 384    or
 385
 386    int foo(int __bar) {
 387      return __bar;
 388    }
 389    libc_hidden_weak(foo)
 390
 391    Similarly for global data: if references to foo within libc.so
 392    should always go to foo defined in libc.so, then in include/foo.h:
 393
 394    extern int foo;
 395    libc_hidden_proto(foo)
 396
 397    and after foo's definition:
 398
 399    int foo = INITIAL_FOO_VALUE;
 400    libc_hidden_data_def(foo)
 401
 402    or
 403
 404    int foo = INITIAL_FOO_VALUE;
 405    libc_hidden_data_weak(foo)
 406
 407    If foo is normally just an alias (strong or weak) to some other function,
 408    you should use the normal strong_alias first, then add libc_hidden_def
 409    or libc_hidden_weak:
 410
 411    int baz(int __bar) {
 412      return __bar;
 413    }
 414    strong_alias(baz, foo)
 415    libc_hidden_weak(foo)
 416
 417    If the function should be internal to multiple objects, say ld.so and
 418    libc.so, the best way is to use:
 419
 420    #if !defined NOT_IN_libc || defined IS_IN_rtld
 421    hidden_proto(foo)
 422    #endif
 423
 424    in include/foo.h and the normal macros at all function definitions
 425    depending on what DSO they belong to.
 426
 427    If versioned_symbol macro is used to define foo,
 428    libc_hidden_ver macro should be used, as in:
 429
 430    int __real_foo(int __bar) {
 431      return __bar;
 432    }
 433    versioned_symbol(libc, __real_foo, foo, GLIBC_2_1);
 434    libc_hidden_ver(__real_foo, foo)
 435  */
 436
 437 /* uClibc specific (the above comment was copied from glibc):
 438  *
 439  * when ppc64 will be supported, we need changes to support
 440  * strong_data_alias (used by asm hidden_data_def)
 441  *
 442  * no versioning support, hidden[_data]_ver are noop
 443  *
 444  * hidden_def() in asm is _hidden_strong_alias (not strong_alias)
 445  *
 446  * libc_hidden_proto(foo) should be added after declaration
 447  * in the header, or after extern foo... in all source files
 448  * (this is discouraged).
 449  * libc_hidden_def does not hide __GI_foo itself, although the name
 450  * suggests it (hiding is done exclusively by libc_hidden_proto).
 451
 452 FIXME! - ?
 453  * The reasoning to have it after the header w/ foo's prototype is
 454  * to get first the __REDIRECT from original header and then create
 455  * the __GI_foo alias
 456
 457  * Hunt for references which still go through PLT (example for x86):
 458  * build shared lib, then disassemble it and search for <xxx@plt>:
 459  * $ objdump -drx libuClibc-*.so >disasm.txt
 460  * $ grep -F '@plt>:' disasm.txt
 461  *
 462  * In uclibc, malloc/free and related functions should be called
 463  * through PLT (making it possible to use alternative malloc),
 464  * and possibly some __pthread_xxx functions can be called through PLT
 465  * (why?). The rest should not use PLT.
 466  */
 467
 468 #if (defined __GNUC__ && defined __GNUC_MINOR__ \
 469         && (( __GNUC__ >= 3 && __GNUC_MINOR__ >= 3) || __GNUC__ >= 4) \
 470     ) || defined __ICC
 471 # define attribute_hidden __attribute__ ((visibility ("hidden")))
 472 # define attribute_protected __attribute__ ((visibility ("protected")))
 473 # define __hidden_proto_hiddenattr(attrs...) __attribute__ ((visibility ("hidden"), ##attrs))
 474 #else
 475 # define attribute_hidden
 476 # define attribute_protected
 477 # define __hidden_proto_hiddenattr(attrs...)
 478 #endif
 479
 480 #if /*!defined STATIC &&*/ !defined __BCC__
 481
 482 # ifndef __ASSEMBLER__
 483 #  define hidden_proto(name, attrs...) __hidden_proto(name, __GI_##name, ##attrs)
 484 #  define __hidden_proto(name, internal, attrs...) \
 485         extern __typeof (name) name __asm__ (__hidden_asmname (#internal)) \
 486         __hidden_proto_hiddenattr (attrs);
 487 #  define __hidden_asmname(name) __hidden_asmname1 (__USER_LABEL_PREFIX__, name)
 488 #  define __hidden_asmname1(prefix, name) __hidden_asmname2(prefix, name)
 489 #  define __hidden_asmname2(prefix, name) #prefix name
 490 #  define __hidden_ver1(local, internal, name) \
 491         extern __typeof (name) __EI_##name __asm__(__hidden_asmname (#internal)); \
 492         extern __typeof (name) __EI_##name __attribute__((alias (__hidden_asmname1 (,#local))))
 493 #  define hidden_ver(local, name)       __hidden_ver1(local, __GI_##name, name);
 494 #  define hidden_data_ver(local, name)  hidden_ver(local, name)
 495 #  define hidden_def(name)              __hidden_ver1(__GI_##name, name, name);
 496 #  define hidden_data_def(name)         hidden_def(name)
 497 #  define hidden_weak(name) \
 498         __hidden_ver1(__GI_##name, name, name) __attribute__((weak));
 499 #  define hidden_data_weak(name)        hidden_weak(name)
 500
 501 # else /* __ASSEMBLER__ */
 502
 503 #  ifdef HAVE_ASM_SET_DIRECTIVE
 504 #   ifdef HAVE_ASM_GLOBAL_DOT_NAME
 505 #    define _hidden_strong_alias(original, alias) \
 506         ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(alias)               ASM_LINE_SEP \
 507         .hidden C_SYMBOL_NAME(alias)                            ASM_LINE_SEP \
 508         .set    C_SYMBOL_NAME(alias),C_SYMBOL_NAME(original)    ASM_LINE_SEP \
 509         ASM_GLOBAL_DIRECTIVE C_SYMBOL_DOT_NAME(alias)           ASM_LINE_SEP \
 510         .hidden C_SYMBOL_DOT_NAME(alias)                        ASM_LINE_SEP \
 511         .set    C_SYMBOL_DOT_NAME(alias),C_SYMBOL_DOT_NAME(original)
 512 #   else
 513 #    define _hidden_strong_alias(original, alias) \
 514         ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(alias)               ASM_LINE_SEP \
 515         .hidden C_SYMBOL_NAME(alias)                            ASM_LINE_SEP \
 516         .set    C_SYMBOL_NAME(alias),C_SYMBOL_NAME(original)
 517 #   endif
 518 #  else /* dont have .set directive */
 519 #   ifdef HAVE_ASM_GLOBAL_DOT_NAME
 520 #    define _hidden_strong_alias(original, alias) \
 521         ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(alias)               ASM_LINE_SEP \
 522         .hidden C_SYMBOL_NAME(alias)                            ASM_LINE_SEP \
 523         C_SYMBOL_NAME(alias) = C_SYMBOL_NAME(original)          ASM_LINE_SEP \
 524         ASM_GLOBAL_DIRECTIVE C_SYMBOL_DOT_NAME(alias)           ASM_LINE_SEP \
 525         .hidden C_SYMBOL_DOT_NAME(alias)                        ASM_LINE_SEP \
 526         C_SYMBOL_DOT_NAME(alias) = C_SYMBOL_DOT_NAME(original)
 527 #   else
 528 #    define _hidden_strong_alias(original, alias) \
 529         ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(alias)               ASM_LINE_SEP \
 530         .hidden C_SYMBOL_NAME(alias)                            ASM_LINE_SEP \
 531         C_SYMBOL_NAME(alias) = C_SYMBOL_NAME(original)
 532 #   endif
 533 #  endif
 534
 535 #  ifdef HAVE_ASM_GLOBAL_DOT_NAME
 536 #   define _hidden_weak_alias(original, alias) \
 537         .hidden C_SYMBOL_NAME(alias)                            ASM_LINE_SEP \
 538         .hidden C_SYMBOL_DOT_NAME(alias)                        ASM_LINE_SEP \
 539         weak_alias(original, alias)
 540 #  else
 541 #   define _hidden_weak_alias(original, alias) \
 542         .hidden C_SYMBOL_NAME(alias)                            ASM_LINE_SEP \
 543         weak_alias(original, alias)
 544 #  endif
 545
 546 /* For assembly, we need to do the opposite of what we do in C:
 547    in assembly gcc __REDIRECT stuff is not in place, so functions
 548    are defined by its normal name and we need to create the
 549    __GI_* alias to it, in C __REDIRECT causes the function definition
 550    to use __GI_* name and we need to add alias to the real name.
 551    There is no reason to use hidden_weak over hidden_def in assembly,
 552    but we provide it for consistency with the C usage.
 553    hidden_proto doesn't make sense for assembly but the equivalent
 554    is to call via the HIDDEN_JUMPTARGET macro instead of JUMPTARGET.  */
 555 #  define hidden_def(name)      _hidden_strong_alias (name, __GI_##name)
 556 #  define hidden_weak(name)     _hidden_weak_alias (name, __GI_##name)
 557 #  define hidden_ver(local, name) strong_alias (local, __GI_##name)
 558 #  define hidden_data_def(name) _hidden_strong_alias (name, __GI_##name)
 559 #  define hidden_data_weak(name)        _hidden_weak_alias (name, __GI_##name)
 560 #  define hidden_data_ver(local, name) strong_data_alias (local, __GI_##name)
 561 #  ifdef HAVE_ASM_GLOBAL_DOT_NAME
 562 #   define HIDDEN_JUMPTARGET(name) .__GI_##name
 563 #  else
 564 #   define HIDDEN_JUMPTARGET(name) __GI_##name
 565 #  endif
 566 # endif /* __ASSEMBLER__ */
 567
 568 #else /* not SHARED */
 569
 570 # ifndef __ASSEMBLER__
 571 #  define hidden_proto(name, attrs...)
 572 # else
 573 #  define HIDDEN_JUMPTARGET(name) name
 574 # endif /* not __ASSEMBLER__ */
 575 # define hidden_weak(name)
 576 # define hidden_def(name)
 577 # define hidden_ver(local, name)
 578 # define hidden_data_weak(name)
 579 # define hidden_data_def(name)
 580 # define hidden_data_ver(local, name)
 581
 582 #endif /* SHARED / not SHARED */
 583
 584
 585 /* uClibc does not support versioning yet. */
 586 #define versioned_symbol(lib, local, symbol, version) /* weak_alias(local, symbol) */
 587 #undef hidden_ver
 588 #define hidden_ver(local, name) /* strong_alias(local, __GI_##name) */
 589 #undef hidden_data_ver
 590 #define hidden_data_ver(local, name) /* strong_alias(local,__GI_##name) */
 591
 592 #if !defined NOT_IN_libc
 593 # define libc_hidden_proto(name, attrs...) hidden_proto (name, ##attrs)
 594 # define libc_hidden_def(name) hidden_def (name)
 595 # define libc_hidden_weak(name) hidden_weak (name)
 596 # define libc_hidden_ver(local, name) hidden_ver (local, name)
 597 # define libc_hidden_data_def(name) hidden_data_def (name)
 598 # define libc_hidden_data_weak(name) hidden_data_weak (name)
 599 # define libc_hidden_data_ver(local, name) hidden_data_ver (local, name)
 600 #else
 601 # define libc_hidden_proto(name, attrs...)
 602 # define libc_hidden_def(name)
 603 # define libc_hidden_weak(name)
 604 # define libc_hidden_ver(local, name)
 605 # define libc_hidden_data_def(name)
 606 # define libc_hidden_data_weak(name)
 607 # define libc_hidden_data_ver(local, name)
 608 #endif
 609
 610 #if defined NOT_IN_libc && defined IS_IN_rtld
 611 # define rtld_hidden_proto(name, attrs...) hidden_proto (name, ##attrs)
 612 # define rtld_hidden_def(name) hidden_def (name)
 613 # define rtld_hidden_weak(name) hidden_weak (name)
 614 # define rtld_hidden_ver(local, name) hidden_ver (local, name)
 615 # define rtld_hidden_data_def(name) hidden_data_def (name)
 616 # define rtld_hidden_data_weak(name) hidden_data_weak (name)
 617 # define rtld_hidden_data_ver(local, name) hidden_data_ver (local, name)
 618 #else
 619 # define rtld_hidden_proto(name, attrs...)
 620 # define rtld_hidden_def(name)
 621 # define rtld_hidden_weak(name)
 622 # define rtld_hidden_ver(local, name)
 623 # define rtld_hidden_data_def(name)
 624 # define rtld_hidden_data_weak(name)
 625 # define rtld_hidden_data_ver(local, name)
 626 #endif
 627
 628 #if defined NOT_IN_libc && defined IS_IN_libm
 629 # define libm_hidden_proto(name, attrs...) hidden_proto (name, ##attrs)
 630 # define libm_hidden_def(name) hidden_def (name)
 631 # define libm_hidden_weak(name) hidden_weak (name)
 632 # define libm_hidden_ver(local, name) hidden_ver (local, name)
 633 # define libm_hidden_data_def(name) hidden_data_def (name)
 634 # define libm_hidden_data_weak(name) hidden_data_weak (name)
 635 # define libm_hidden_data_ver(local, name) hidden_data_ver (local, name)
 636 #else
 637 # define libm_hidden_proto(name, attrs...)
 638 # define libm_hidden_def(name)
 639 # define libm_hidden_weak(name)
 640 # define libm_hidden_ver(local, name)
 641 # define libm_hidden_data_def(name)
 642 # define libm_hidden_data_weak(name)
 643 # define libm_hidden_data_ver(local, name)
 644 #endif
 645
 646 #if defined NOT_IN_libc && defined IS_IN_libresolv
 647 # define libresolv_hidden_proto(name, attrs...) hidden_proto (name, ##attrs)
 648 # define libresolv_hidden_def(name) hidden_def (name)
 649 # define libresolv_hidden_weak(name) hidden_weak (name)
 650 # define libresolv_hidden_ver(local, name) hidden_ver (local, name)
 651 # define libresolv_hidden_data_def(name) hidden_data_def (name)
 652 # define libresolv_hidden_data_weak(name) hidden_data_weak (name)
 653 # define libresolv_hidden_data_ver(local, name) hidden_data_ver (local, name)
 654 #else
 655 # define libresolv_hidden_proto(name, attrs...)
 656 # define libresolv_hidden_def(name)
 657 # define libresolv_hidden_weak(name)
 658 # define libresolv_hidden_ver(local, name)
 659 # define libresolv_hidden_data_def(name)
 660 # define libresolv_hidden_data_weak(name)
 661 # define libresolv_hidden_data_ver(local, name)
 662 #endif
 663
 664 #if defined NOT_IN_libc && defined IS_IN_librt
 665 # define librt_hidden_proto(name, attrs...) hidden_proto (name, ##attrs)
 666 # define librt_hidden_def(name) hidden_def (name)
 667 # define librt_hidden_weak(name) hidden_weak (name)
 668 # define librt_hidden_ver(local, name) hidden_ver (local, name)
 669 # define librt_hidden_data_def(name) hidden_data_def (name)
 670 # define librt_hidden_data_weak(name) hidden_data_weak (name)
 671 # define librt_hidden_data_ver(local, name) hidden_data_ver (local, name)
 672 #else
 673 # define librt_hidden_proto(name, attrs...)
 674 # define librt_hidden_def(name)
 675 # define librt_hidden_weak(name)
 676 # define librt_hidden_ver(local, name)
 677 # define librt_hidden_data_def(name)
 678 # define librt_hidden_data_weak(name)
 679 # define librt_hidden_data_ver(local, name)
 680 #endif
 681
 682 #if defined NOT_IN_libc && defined IS_IN_libdl
 683 # define libdl_hidden_proto(name, attrs...) hidden_proto (name, ##attrs)
 684 # define libdl_hidden_def(name) hidden_def (name)
 685 # define libdl_hidden_weak(name) hidden_weak (name)
 686 # define libdl_hidden_ver(local, name) hidden_ver (local, name)
 687 # define libdl_hidden_data_def(name) hidden_data_def (name)
 688 # define libdl_hidden_data_weak(name) hidden_data_weak (name)
 689 # define libdl_hidden_data_ver(local, name) hidden_data_ver (local, name)
 690 #else
 691 # define libdl_hidden_proto(name, attrs...)
 692 # define libdl_hidden_def(name)
 693 # define libdl_hidden_weak(name)
 694 # define libdl_hidden_ver(local, name)
 695 # define libdl_hidden_data_def(name)
 696 # define libdl_hidden_data_weak(name)
 697 # define libdl_hidden_data_ver(local, name)
 698 #endif
 699
 700 #if defined NOT_IN_libc && defined IS_IN_libintl
 701 # define libintl_hidden_proto(name, attrs...) hidden_proto (name, ##attrs)
 702 # define libintl_hidden_def(name) hidden_def (name)
 703 # define libintl_hidden_weak(name) hidden_weak (name)
 704 # define libintl_hidden_ver(local, name) hidden_ver (local, name)
 705 # define libintl_hidden_data_def(name) hidden_data_def (name)
 706 # define libintl_hidden_data_weak(name) hidden_data_weak (name)
 707 # define libintl_hidden_data_ver(local, name) hidden_data_ver(local, name)
 708 #else
 709 # define libintl_hidden_proto(name, attrs...)
 710 # define libintl_hidden_def(name)
 711 # define libintl_hidden_weak(name)
 712 # define libintl_hidden_ver(local, name)
 713 # define libintl_hidden_data_def(name)
 714 # define libintl_hidden_data_weak(name)
 715 # define libintl_hidden_data_ver(local, name)
 716 #endif
 717
 718 #if defined NOT_IN_libc && defined IS_IN_libnsl
 719 # define libnsl_hidden_proto(name, attrs...) hidden_proto (name, ##attrs)
 720 # define libnsl_hidden_def(name) hidden_def (name)
 721 # define libnsl_hidden_weak(name) hidden_weak (name)
 722 # define libnsl_hidden_ver(local, name) hidden_ver (local, name)
 723 # define libnsl_hidden_data_def(name) hidden_data_def (name)
 724 # define libnsl_hidden_data_weak(name) hidden_data_weak (name)
 725 # define libnsl_hidden_data_ver(local, name) hidden_data_ver (local, name)
 726 #else
 727 # define libnsl_hidden_proto(name, attrs...)
 728 # define libnsl_hidden_def(name)
 729 # define libnsl_hidden_weak(name)
 730 # define libnsl_hidden_ver(local, name)
 731 # define libnsl_hidden_data_def(name)
 732 # define libnsl_hidden_data_weak(name)
 733 # define libnsl_hidden_data_ver(local, name)
 734 #endif
 735
 736 #if defined NOT_IN_libc && defined IS_IN_libutil
 737 # define libutil_hidden_proto(name, attrs...) hidden_proto (name, ##attrs)
 738 # define libutil_hidden_def(name) hidden_def (name)
 739 # define libutil_hidden_weak(name) hidden_weak (name)
 740 # define libutil_hidden_ver(local, name) hidden_ver (local, name)
 741 # define libutil_hidden_data_def(name) hidden_data_def (name)
 742 # define libutil_hidden_data_weak(name) hidden_data_weak (name)
 743 # define libutil_hidden_data_ver(local, name) hidden_data_ver (local, name)
 744 #else
 745 # define libutil_hidden_proto(name, attrs...)
 746 # define libutil_hidden_def(name)
 747 # define libutil_hidden_weak(name)
 748 # define libutil_hidden_ver(local, name)
 749 # define libutil_hidden_data_def(name)
 750 # define libutil_hidden_data_weak(name)
 751 # define libutil_hidden_data_ver(local, name)
 752 #endif
 753
 754 #if defined NOT_IN_libc && defined IS_IN_libcrypt
 755 # define libcrypt_hidden_proto(name, attrs...) hidden_proto (name, ##attrs)
 756 # define libcrypt_hidden_def(name) hidden_def (name)
 757 # define libcrypt_hidden_weak(name) hidden_weak (name)
 758 # define libcrypt_hidden_ver(local, name) hidden_ver (local, name)
 759 # define libcrypt_hidden_data_def(name) hidden_data_def (name)
 760 # define libcrypt_hidden_data_weak(name) hidden_data_weak (name)
 761 # define libcrypt_hidden_data_ver(local, name) hidden_data_ver (local, name)
 762 #else
 763 # define libcrypt_hidden_proto(name, attrs...)
 764 # define libcrypt_hidden_def(name)
 765 # define libcrypt_hidden_weak(name)
 766 # define libcrypt_hidden_ver(local, name)
 767 # define libcrypt_hidden_data_def(name)
 768 # define libcrypt_hidden_data_weak(name)
 769 # define libcrypt_hidden_data_ver(local, name)
 770 #endif
 771
 772 #if defined NOT_IN_libc && defined IS_IN_libpthread
 773 # define libpthread_hidden_proto(name, attrs...) hidden_proto (name, ##attrs)
 774 # define libpthread_hidden_def(name) hidden_def (name)
 775 # define libpthread_hidden_weak(name) hidden_weak (name)
 776 # define libpthread_hidden_ver(local, name) hidden_ver (local, name)
 777 # define libpthread_hidden_data_def(name) hidden_data_def (name)
 778 # define libpthread_hidden_data_weak(name) hidden_data_weak (name)
 779 # define libpthread_hidden_data_ver(local, name) hidden_data_ver (local, name)
 780 #else
 781 # define libpthread_hidden_proto(name, attrs...)
 782 # define libpthread_hidden_def(name)
 783 # define libpthread_hidden_weak(name)
 784 # define libpthread_hidden_ver(local, name)
 785 # define libpthread_hidden_data_def(name)
 786 # define libpthread_hidden_data_weak(name)
 787 # define libpthread_hidden_data_ver(local, name)
 788 #endif
 789
 790 #endif /* libc-symbols.h */