libc-symbols.h 28 KB

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  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. 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. The GNU C Library is distributed in the hope that it will be useful,
  11. but WITHOUT ANY WARRANTY; without even the implied warranty of
  12. MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  13. Lesser General Public License for more details.
  14. You should have received a copy of the GNU Lesser General Public
  15. License along with the GNU C Library; if not, write to the Free
  16. Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17. 02111-1307 USA. */
  18. #ifndef _LIBC_SYMBOLS_H
  19. #define _LIBC_SYMBOLS_H 1
  20. /* This is defined for the compilation of all C library code. features.h
  21. tests this to avoid inclusion of stubs.h while compiling the library,
  22. before stubs.h has been generated. Some library code that is shared
  23. with other packages also tests this symbol to see if it is being
  24. compiled as part of the C library. We must define this before including
  25. config.h, because it makes some definitions conditional on whether libc
  26. itself is being compiled, or just some generator program. */
  27. #define _LIBC 1
  28. /* This file's macros are included implicitly in the compilation of every
  29. file in the C library by -imacros.
  30. We include uClibc_arch_features.h which is defined by arch devs.
  31. It should define for us the following symbols:
  32. * HAVE_ASM_SET_DIRECTIVE if we have `.set B, A' instead of `A = B'.
  33. * ASM_GLOBAL_DIRECTIVE with `.globl' or `.global'.
  34. * ASM_TYPE_DIRECTIVE_PREFIX with `@' or `#' or whatever for .type,
  35. or leave it undefined if there is no .type directive.
  36. * HAVE_ELF if using ELF, which supports weak symbols using `.weak'.
  37. * HAVE_ASM_WEAK_DIRECTIVE if we have weak symbols using `.weak'.
  38. * HAVE_ASM_WEAKEXT_DIRECTIVE if we have weak symbols using `.weakext'.
  39. */
  40. #include <bits/uClibc_arch_features.h>
  41. /* Enable declarations of GNU extensions, since we are compiling them. */
  42. #define _GNU_SOURCE 1
  43. /* Prepare for the case that `__builtin_expect' is not available. */
  44. #if defined __GNUC__ && __GNUC__ == 2 && __GNUC_MINOR__ < 96
  45. # define __builtin_expect(x, expected_value) (x)
  46. #endif
  47. #ifndef likely
  48. # define likely(x) __builtin_expect((!!(x)),1)
  49. #endif
  50. #ifndef unlikely
  51. # define unlikely(x) __builtin_expect((!!(x)),0)
  52. #endif
  53. #if defined __GNUC__ && (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3))
  54. # ifndef __cold
  55. # define __cold __attribute__ ((__cold__))
  56. # endif
  57. # ifndef __hot
  58. # define __hot __attribute__ ((__hot__))
  59. # endif
  60. #else
  61. # ifndef __cold
  62. # define __cold
  63. # endif
  64. # ifndef __hot
  65. # define __hot
  66. # endif
  67. #endif
  68. #ifndef __LINUX_COMPILER_H
  69. # define __LINUX_COMPILER_H
  70. #endif
  71. #ifndef __cast__
  72. # define __cast__(_to)
  73. #endif
  74. #if defined __GNUC__ && (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 4))
  75. # define attribute_optimize(x) __attribute__ ((optimize(x)))
  76. #else
  77. # define attribute_optimize(x)
  78. #endif
  79. #define attribute_unused __attribute__ ((unused))
  80. #if defined __GNUC__ || defined __ICC
  81. # define attribute_noreturn __attribute__ ((__noreturn__))
  82. #else
  83. # define attribute_noreturn
  84. #endif
  85. #define libc_freeres_ptr(decl) \
  86. __make_section_unallocated ("__libc_freeres_ptrs, \"aw\", %nobits") \
  87. decl __attribute__ ((section ("__libc_freeres_ptrs" __sec_comment)))
  88. #define __libc_freeres_fn_section \
  89. __attribute__ ((section ("__libc_freeres_fn")))
  90. #ifndef NOT_IN_libc
  91. # define IS_IN_libc 1
  92. #endif
  93. /* Indirect stringification. Doing two levels allows
  94. * the parameter to be a macro itself.
  95. */
  96. #define __stringify_1(x) #x
  97. #define __stringify(x) __stringify_1(x)
  98. #ifdef __UCLIBC_HAVE_ASM_SET_DIRECTIVE__
  99. # define HAVE_ASM_SET_DIRECTIVE
  100. #else
  101. # undef HAVE_ASM_SET_DIRECTIVE
  102. #endif
  103. #ifdef __UCLIBC_ASM_GLOBAL_DIRECTIVE__
  104. # define ASM_GLOBAL_DIRECTIVE __UCLIBC_ASM_GLOBAL_DIRECTIVE__
  105. #else
  106. # define ASM_GLOBAL_DIRECTIVE .global
  107. #endif
  108. #ifdef __UCLIBC_HAVE_ASM_WEAK_DIRECTIVE__
  109. # define HAVE_ASM_WEAK_DIRECTIVE
  110. #else
  111. # undef HAVE_ASM_WEAK_DIRECTIVE
  112. #endif
  113. #ifdef __UCLIBC_HAVE_ASM_WEAKEXT_DIRECTIVE__
  114. # define HAVE_ASM_WEAKEXT_DIRECTIVE
  115. #else
  116. # undef HAVE_ASM_WEAKEXT_DIRECTIVE
  117. #endif
  118. #ifdef __UCLIBC_HAVE_ASM_GLOBAL_DOT_NAME__
  119. # define HAVE_ASM_GLOBAL_DOT_NAME
  120. #else
  121. # undef HAVE_ASM_GLOBAL_DOT_NAME
  122. #endif
  123. #ifdef __UCLIBC_HAVE_ASM_CFI_DIRECTIVES__
  124. # define HAVE_ASM_CFI_DIRECTIVES
  125. #else
  126. # undef HAVE_ASM_CFI_DIRECTIVES
  127. #endif
  128. #if defined HAVE_ASM_WEAK_DIRECTIVE || defined HAVE_ASM_WEAKEXT_DIRECTIVE
  129. # define HAVE_WEAK_SYMBOLS
  130. #endif
  131. #undef C_SYMBOL_NAME
  132. #ifndef C_SYMBOL_NAME
  133. # ifndef __UCLIBC_UNDERSCORES__
  134. # define C_SYMBOL_NAME(name) name
  135. # else
  136. # define C_SYMBOL_NAME(name) _##name
  137. # endif
  138. #endif
  139. #ifdef __UCLIBC_ASM_LINE_SEP__
  140. # define ASM_LINE_SEP __UCLIBC_ASM_LINE_SEP__
  141. #else
  142. # define ASM_LINE_SEP ;
  143. #endif
  144. #ifdef HAVE_ASM_GLOBAL_DOT_NAME
  145. # ifndef C_SYMBOL_DOT_NAME
  146. # if defined __GNUC__ && defined __GNUC_MINOR__ \
  147. && (__GNUC__ << 16) + __GNUC_MINOR__ >= (3 << 16) + 1
  148. # define C_SYMBOL_DOT_NAME(name) .name
  149. # else
  150. # define C_SYMBOL_DOT_NAME(name) .##name
  151. # endif
  152. # endif
  153. #endif
  154. #ifndef __ASSEMBLER__
  155. /* GCC understands weak symbols and aliases; use its interface where
  156. possible, instead of embedded assembly language. */
  157. /* Define ALIASNAME as a strong alias for NAME. */
  158. # define strong_alias(name, aliasname) _strong_alias(name, aliasname)
  159. # define _strong_alias(name, aliasname) \
  160. extern __typeof (name) aliasname __attribute__ ((alias (#name)));
  161. /* Same, but does not check for type match. Use sparingly.
  162. Example: strong_alias(stat,stat64) may fail, this one works: */
  163. # define strong_alias_untyped(name, aliasname) \
  164. _strong_alias_untyped(name, aliasname)
  165. # define _strong_alias_untyped(name, aliasname) \
  166. extern __typeof (aliasname) aliasname __attribute__ ((alias (#name)));
  167. /* This comes between the return type and function name in
  168. a function definition to make that definition weak. */
  169. # define weak_function __attribute__ ((weak))
  170. # define weak_const_function __attribute__ ((weak, __const__))
  171. # ifdef HAVE_WEAK_SYMBOLS
  172. /* Define ALIASNAME as a weak alias for NAME.
  173. If weak aliases are not available, this defines a strong alias. */
  174. # define weak_alias(name, aliasname) _weak_alias (name, aliasname)
  175. # define _weak_alias(name, aliasname) \
  176. extern __typeof (name) aliasname __attribute__ ((weak, alias (#name)));
  177. /* Declare SYMBOL as weak undefined symbol (resolved to 0 if not defined). */
  178. # define weak_extern(symbol) _weak_extern (weak symbol)
  179. # define _weak_extern(expr) _Pragma (#expr)
  180. # else
  181. # define weak_alias(name, aliasname) strong_alias(name, aliasname)
  182. # define weak_extern(symbol) /* Nothing. */
  183. # endif
  184. #else /* __ASSEMBLER__ */
  185. # ifdef HAVE_ASM_SET_DIRECTIVE
  186. # ifdef HAVE_ASM_GLOBAL_DOT_NAME
  187. # define strong_alias(original, alias) \
  188. ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(alias) ASM_LINE_SEP \
  189. .set C_SYMBOL_NAME(alias),C_SYMBOL_NAME(original) ASM_LINE_SEP \
  190. ASM_GLOBAL_DIRECTIVE C_SYMBOL_DOT_NAME(alias) ASM_LINE_SEP \
  191. .set C_SYMBOL_DOT_NAME(alias),C_SYMBOL_DOT_NAME(original)
  192. # define strong_data_alias(original, alias) \
  193. ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(alias) ASM_LINE_SEP \
  194. .set C_SYMBOL_NAME(alias),C_SYMBOL_NAME(original)
  195. # else
  196. # define strong_alias(original, alias) \
  197. ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(alias) ASM_LINE_SEP \
  198. .set C_SYMBOL_NAME(alias),C_SYMBOL_NAME(original)
  199. # define strong_data_alias(original, alias) strong_alias(original, alias)
  200. # endif
  201. # else
  202. # ifdef HAVE_ASM_GLOBAL_DOT_NAME
  203. # define strong_alias(original, alias) \
  204. ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(alias) ASM_LINE_SEP \
  205. C_SYMBOL_NAME(alias) = C_SYMBOL_NAME(original) ASM_LINE_SEP \
  206. ASM_GLOBAL_DIRECTIVE C_SYMBOL_DOT_NAME(alias) ASM_LINE_SEP \
  207. C_SYMBOL_DOT_NAME(alias) = C_SYMBOL_DOT_NAME(original)
  208. # define strong_data_alias(original, alias) \
  209. ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(alias) ASM_LINE_SEP \
  210. C_SYMBOL_NAME(alias) = C_SYMBOL_NAME(original)
  211. # else
  212. # define strong_alias(original, alias) \
  213. ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(alias) ASM_LINE_SEP \
  214. C_SYMBOL_NAME(alias) = C_SYMBOL_NAME(original)
  215. # define strong_data_alias(original, alias) strong_alias(original, alias)
  216. # endif
  217. # endif
  218. # ifdef HAVE_WEAK_SYMBOLS
  219. # ifdef HAVE_ASM_WEAKEXT_DIRECTIVE
  220. # ifdef HAVE_ASM_GLOBAL_DOT_NAME
  221. # define weak_alias(original, alias) \
  222. .weakext C_SYMBOL_NAME(alias),C_SYMBOL_NAME(original) ASM_LINE_SEP \
  223. .weakext C_SYMBOL_DOT_NAME(alias),C_SYMBOL_DOT_NAME(original)
  224. # else
  225. # define weak_alias(original, alias) \
  226. .weakext C_SYMBOL_NAME(alias),C_SYMBOL_NAME(original)
  227. # endif
  228. # define weak_extern(symbol) \
  229. .weakext C_SYMBOL_NAME(symbol)
  230. # else /* ! HAVE_ASM_WEAKEXT_DIRECTIVE */
  231. # ifdef HAVE_ASM_SET_DIRECTIVE
  232. # ifdef HAVE_ASM_GLOBAL_DOT_NAME
  233. # define weak_alias(original, alias) \
  234. .weak C_SYMBOL_NAME(alias) ASM_LINE_SEP \
  235. .set C_SYMBOL_NAME(alias),C_SYMBOL_NAME(original) ASM_LINE_SEP \
  236. .weak C_SYMBOL_DOT_NAME(alias) ASM_LINE_SEP \
  237. .set C_SYMBOL_DOT_NAME(alias),C_SYMBOL_DOT_NAME(original)
  238. # else
  239. # define weak_alias(original, alias) \
  240. .weak C_SYMBOL_NAME(alias) ASM_LINE_SEP \
  241. .set C_SYMBOL_NAME(alias),C_SYMBOL_NAME(original)
  242. # endif
  243. # else /* ! HAVE_ASM_SET_DIRECTIVE */
  244. # ifdef HAVE_ASM_GLOBAL_DOT_NAME
  245. # define weak_alias(original, alias) \
  246. .weak C_SYMBOL_NAME(alias) ASM_LINE_SEP \
  247. C_SYMBOL_NAME(alias) = C_SYMBOL_NAME(original) ASM_LINE_SEP \
  248. .weak C_SYMBOL_DOT_NAME(alias) ASM_LINE_SEP \
  249. C_SYMBOL_DOT_NAME(alias) = C_SYMBOL_DOT_NAME(original)
  250. # else
  251. # define weak_alias(original, alias) \
  252. .weak C_SYMBOL_NAME(alias) ASM_LINE_SEP \
  253. C_SYMBOL_NAME(alias) = C_SYMBOL_NAME(original)
  254. # endif
  255. # endif
  256. # define weak_extern(symbol) \
  257. .weak C_SYMBOL_NAME(symbol)
  258. # endif /* ! HAVE_ASM_WEAKEXT_DIRECTIVE */
  259. # else /* ! HAVE_WEAK_SYMBOLS */
  260. # define weak_alias(original, alias) strong_alias(original, alias)
  261. # define weak_extern(symbol) /* Nothing */
  262. # endif /* ! HAVE_WEAK_SYMBOLS */
  263. #endif /* __ASSEMBLER__ */
  264. /* On some platforms we can make internal function calls (i.e., calls of
  265. functions not exported) a bit faster by using a different calling
  266. convention. */
  267. #ifndef internal_function
  268. # define internal_function /* empty */
  269. #endif
  270. /* We want the .gnu.warning.SYMBOL section to be unallocated. */
  271. #define __make_section_unallocated(section_string) \
  272. __asm__ (".section " section_string "\n\t.previous");
  273. /* Tacking on "\n#APP\n\t#" to the section name makes gcc put it's bogus
  274. section attributes on what looks like a comment to the assembler. */
  275. #ifdef __sparc__ /* HAVE_SECTION_QUOTES */
  276. # define __sec_comment "\"\n#APP\n\t#\""
  277. #else
  278. # define __sec_comment "\n#APP\n\t#"
  279. #endif
  280. /* When a reference to SYMBOL is encountered, the linker will emit a
  281. warning message MSG. */
  282. #define link_warning(symbol, msg) \
  283. __make_section_unallocated (".gnu.warning." #symbol) \
  284. static const char __evoke_link_warning_##symbol[] \
  285. __attribute__ ((used, section (".gnu.warning." #symbol __sec_comment))) \
  286. = msg;
  287. /* Handling on non-exported internal names. We have to do this only
  288. for shared code. */
  289. #ifdef SHARED
  290. # define INTUSE(name) name##_internal
  291. # define INTDEF(name) strong_alias (name, name##_internal)
  292. # define INTVARDEF(name) _INTVARDEF (name, name##_internal)
  293. # if defined HAVE_VISIBILITY_ATTRIBUTE
  294. # define _INTVARDEF(name, aliasname) \
  295. extern __typeof (name) aliasname __attribute__ ((alias (#name), \
  296. visibility ("hidden")));
  297. # else
  298. # define _INTVARDEF(name, aliasname) \
  299. extern __typeof (name) aliasname __attribute__ ((alias (#name)));
  300. # endif
  301. # define INTDEF2(name, newname) strong_alias (name, newname##_internal)
  302. # define INTVARDEF2(name, newname) _INTVARDEF (name, newname##_internal)
  303. #else
  304. # define INTUSE(name) name
  305. # define INTDEF(name)
  306. # define INTVARDEF(name)
  307. # define INTDEF2(name, newname)
  308. # define INTVARDEF2(name, newname)
  309. #endif
  310. /* The following macros are used for PLT bypassing within libc.so
  311. (and if needed other libraries similarly).
  312. If calls to foo within libc.so should always go to foo defined in libc.so,
  313. then in include/foo.h you add:
  314. int foo(int __bar);
  315. libc_hidden_proto(foo)
  316. line and after the foo function definition:
  317. int foo(int __bar) {
  318. return __bar;
  319. }
  320. libc_hidden_def(foo)
  321. or
  322. int foo(int __bar) {
  323. return __bar;
  324. }
  325. libc_hidden_weak(foo)
  326. Similarly for global data: if references to foo within libc.so
  327. should always go to foo defined in libc.so, then in include/foo.h:
  328. extern int foo;
  329. libc_hidden_proto(foo)
  330. and after foo's definition:
  331. int foo = INITIAL_FOO_VALUE;
  332. libc_hidden_data_def(foo)
  333. or
  334. int foo = INITIAL_FOO_VALUE;
  335. libc_hidden_data_weak(foo)
  336. If foo is normally just an alias (strong or weak) to some other function,
  337. you should use the normal strong_alias first, then add libc_hidden_def
  338. or libc_hidden_weak:
  339. int baz(int __bar) {
  340. return __bar;
  341. }
  342. strong_alias(baz, foo)
  343. libc_hidden_weak(foo)
  344. If the function should be internal to multiple objects, say ld.so and
  345. libc.so, the best way is to use:
  346. #if !defined NOT_IN_libc || defined IS_IN_rtld
  347. hidden_proto(foo)
  348. #endif
  349. in include/foo.h and the normal macros at all function definitions
  350. depending on what DSO they belong to.
  351. If versioned_symbol macro is used to define foo,
  352. libc_hidden_ver macro should be used, as in:
  353. int __real_foo(int __bar) {
  354. return __bar;
  355. }
  356. versioned_symbol(libc, __real_foo, foo, GLIBC_2_1);
  357. libc_hidden_ver(__real_foo, foo)
  358. */
  359. /* uClibc specific (the above comment was copied from glibc):
  360. *
  361. * when ppc64 will be supported, we need changes to support
  362. * strong_data_alias (used by asm hidden_data_def)
  363. *
  364. * no versioning support, hidden[_data]_ver are noop
  365. *
  366. * hidden_def() in asm is _hidden_strong_alias (not strong_alias)
  367. *
  368. * libc_hidden_proto(foo) should be added after declaration
  369. * in the header, or after extern foo... in all source files
  370. * (this is discouraged).
  371. * libc_hidden_def does not hide __GI_foo itself, although the name
  372. * suggests it (hiding is done exclusively by libc_hidden_proto).
  373. FIXME! - ?
  374. * The reasoning to have it after the header w/ foo's prototype is
  375. * to get first the __REDIRECT from original header and then create
  376. * the __GI_foo alias
  377. * Hunt for references which still go through PLT (example for x86):
  378. * build shared lib, then disassemble it and search for <xxx@plt>:
  379. * $ objdump -drx libuClibc-*.so >disasm.txt
  380. * $ grep -F '@plt>:' disasm.txt
  381. *
  382. * In uclibc, malloc/free and related functions should be called
  383. * through PLT (making it possible to use alternative malloc),
  384. * and possibly some __pthread_xxx functions can be called through PLT
  385. * (why?). The rest should not use PLT.
  386. */
  387. #if (defined __GNUC__ && defined __GNUC_MINOR__ \
  388. && (( __GNUC__ >= 3 && __GNUC_MINOR__ >= 3) || __GNUC__ >= 4) \
  389. ) || defined __ICC
  390. # define attribute_hidden __attribute__ ((visibility ("hidden")))
  391. # define __hidden_proto_hiddenattr(attrs...) __attribute__ ((visibility ("hidden"), ##attrs))
  392. #else
  393. # define attribute_hidden
  394. # define __hidden_proto_hiddenattr(attrs...)
  395. #endif
  396. #if /*!defined STATIC &&*/ !defined __BCC__
  397. # ifndef __ASSEMBLER__
  398. # define hidden_proto(name, attrs...) __hidden_proto(name, __GI_##name, ##attrs)
  399. # define __hidden_proto(name, internal, attrs...) \
  400. extern __typeof (name) name __asm__ (__hidden_asmname (#internal)) \
  401. __hidden_proto_hiddenattr (attrs);
  402. # define __hidden_asmname(name) __hidden_asmname1 (__USER_LABEL_PREFIX__, name)
  403. # define __hidden_asmname1(prefix, name) __hidden_asmname2(prefix, name)
  404. # define __hidden_asmname2(prefix, name) #prefix name
  405. # define __hidden_ver1(local, internal, name) \
  406. extern __typeof (name) __EI_##name __asm__(__hidden_asmname (#internal)); \
  407. extern __typeof (name) __EI_##name __attribute__((alias (__hidden_asmname1 (,#local))))
  408. # define hidden_ver(local, name) __hidden_ver1(local, __GI_##name, name);
  409. # define hidden_data_ver(local, name) hidden_ver(local, name)
  410. # define hidden_def(name) __hidden_ver1(__GI_##name, name, name);
  411. # define hidden_data_def(name) hidden_def(name)
  412. # define hidden_weak(name) \
  413. __hidden_ver1(__GI_##name, name, name) __attribute__((weak));
  414. # define hidden_data_weak(name) hidden_weak(name)
  415. # else /* __ASSEMBLER__ */
  416. # ifdef HAVE_ASM_SET_DIRECTIVE
  417. # ifdef HAVE_ASM_GLOBAL_DOT_NAME
  418. # define _hidden_strong_alias(original, alias) \
  419. ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(alias) ASM_LINE_SEP \
  420. .hidden C_SYMBOL_NAME(alias) ASM_LINE_SEP \
  421. .set C_SYMBOL_NAME(alias),C_SYMBOL_NAME(original) ASM_LINE_SEP \
  422. ASM_GLOBAL_DIRECTIVE C_SYMBOL_DOT_NAME(alias) ASM_LINE_SEP \
  423. .hidden C_SYMBOL_DOT_NAME(alias) ASM_LINE_SEP \
  424. .set C_SYMBOL_DOT_NAME(alias),C_SYMBOL_DOT_NAME(original)
  425. # else
  426. # define _hidden_strong_alias(original, alias) \
  427. ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(alias) ASM_LINE_SEP \
  428. .hidden C_SYMBOL_NAME(alias) ASM_LINE_SEP \
  429. .set C_SYMBOL_NAME(alias),C_SYMBOL_NAME(original)
  430. # endif
  431. # else /* dont have .set directive */
  432. # ifdef HAVE_ASM_GLOBAL_DOT_NAME
  433. # define _hidden_strong_alias(original, alias) \
  434. ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(alias) ASM_LINE_SEP \
  435. .hidden C_SYMBOL_NAME(alias) ASM_LINE_SEP \
  436. C_SYMBOL_NAME(alias) = C_SYMBOL_NAME(original) ASM_LINE_SEP \
  437. ASM_GLOBAL_DIRECTIVE C_SYMBOL_DOT_NAME(alias) ASM_LINE_SEP \
  438. .hidden C_SYMBOL_DOT_NAME(alias) ASM_LINE_SEP \
  439. C_SYMBOL_DOT_NAME(alias) = C_SYMBOL_DOT_NAME(original)
  440. # else
  441. # define _hidden_strong_alias(original, alias) \
  442. ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(alias) ASM_LINE_SEP \
  443. .hidden C_SYMBOL_NAME(alias) ASM_LINE_SEP \
  444. C_SYMBOL_NAME(alias) = C_SYMBOL_NAME(original)
  445. # endif
  446. # endif
  447. # ifdef HAVE_ASM_GLOBAL_DOT_NAME
  448. # define _hidden_weak_alias(original, alias) \
  449. .hidden C_SYMBOL_NAME(alias) ASM_LINE_SEP \
  450. .hidden C_SYMBOL_DOT_NAME(alias) ASM_LINE_SEP \
  451. weak_alias(original, alias)
  452. # else
  453. # define _hidden_weak_alias(original, alias) \
  454. .hidden C_SYMBOL_NAME(alias) ASM_LINE_SEP \
  455. weak_alias(original, alias)
  456. # endif
  457. /* For assembly, we need to do the opposite of what we do in C:
  458. in assembly gcc __REDIRECT stuff is not in place, so functions
  459. are defined by its normal name and we need to create the
  460. __GI_* alias to it, in C __REDIRECT causes the function definition
  461. to use __GI_* name and we need to add alias to the real name.
  462. There is no reason to use hidden_weak over hidden_def in assembly,
  463. but we provide it for consistency with the C usage.
  464. hidden_proto doesn't make sense for assembly but the equivalent
  465. is to call via the HIDDEN_JUMPTARGET macro instead of JUMPTARGET. */
  466. # define hidden_def(name) _hidden_strong_alias (name, __GI_##name)
  467. # define hidden_weak(name) _hidden_weak_alias (name, __GI_##name)
  468. # define hidden_ver(local, name) strong_alias (local, __GI_##name)
  469. # define hidden_data_def(name) _hidden_strong_alias (name, __GI_##name)
  470. # define hidden_data_weak(name) _hidden_weak_alias (name, __GI_##name)
  471. # define hidden_data_ver(local, name) strong_data_alias (local, __GI_##name)
  472. # ifdef HAVE_ASM_GLOBAL_DOT_NAME
  473. # define HIDDEN_JUMPTARGET(name) .__GI_##name
  474. # else
  475. # define HIDDEN_JUMPTARGET(name) __GI_##name
  476. # endif
  477. # endif /* __ASSEMBLER__ */
  478. #else /* not SHARED */
  479. # ifndef __ASSEMBLER__
  480. # define hidden_proto(name, attrs...)
  481. # else
  482. # define HIDDEN_JUMPTARGET(name) name
  483. # endif /* not __ASSEMBLER__ */
  484. # define hidden_weak(name)
  485. # define hidden_def(name)
  486. # define hidden_ver(local, name)
  487. # define hidden_data_weak(name)
  488. # define hidden_data_def(name)
  489. # define hidden_data_ver(local, name)
  490. #endif /* SHARED / not SHARED */
  491. /* uClibc does not support versioning yet. */
  492. #define versioned_symbol(lib, local, symbol, version) /* weak_alias(local, symbol) */
  493. #undef hidden_ver
  494. #define hidden_ver(local, name) /* strong_alias(local, __GI_##name) */
  495. #undef hidden_data_ver
  496. #define hidden_data_ver(local, name) /* strong_alias(local,__GI_##name) */
  497. #if !defined NOT_IN_libc
  498. # define libc_hidden_proto(name, attrs...) hidden_proto (name, ##attrs)
  499. # define libc_hidden_def(name) hidden_def (name)
  500. # define libc_hidden_weak(name) hidden_weak (name)
  501. # define libc_hidden_ver(local, name) hidden_ver (local, name)
  502. # define libc_hidden_data_def(name) hidden_data_def (name)
  503. # define libc_hidden_data_weak(name) hidden_data_weak (name)
  504. # define libc_hidden_data_ver(local, name) hidden_data_ver (local, name)
  505. #else
  506. # define libc_hidden_proto(name, attrs...)
  507. # define libc_hidden_def(name)
  508. # define libc_hidden_weak(name)
  509. # define libc_hidden_ver(local, name)
  510. # define libc_hidden_data_def(name)
  511. # define libc_hidden_data_weak(name)
  512. # define libc_hidden_data_ver(local, name)
  513. #endif
  514. #if defined NOT_IN_libc && defined IS_IN_rtld
  515. # define rtld_hidden_proto(name, attrs...) hidden_proto (name, ##attrs)
  516. # define rtld_hidden_def(name) hidden_def (name)
  517. # define rtld_hidden_weak(name) hidden_weak (name)
  518. # define rtld_hidden_ver(local, name) hidden_ver (local, name)
  519. # define rtld_hidden_data_def(name) hidden_data_def (name)
  520. # define rtld_hidden_data_weak(name) hidden_data_weak (name)
  521. # define rtld_hidden_data_ver(local, name) hidden_data_ver (local, name)
  522. #else
  523. # define rtld_hidden_proto(name, attrs...)
  524. # define rtld_hidden_def(name)
  525. # define rtld_hidden_weak(name)
  526. # define rtld_hidden_ver(local, name)
  527. # define rtld_hidden_data_def(name)
  528. # define rtld_hidden_data_weak(name)
  529. # define rtld_hidden_data_ver(local, name)
  530. #endif
  531. #if defined NOT_IN_libc && defined IS_IN_libm
  532. # define libm_hidden_proto(name, attrs...) hidden_proto (name, ##attrs)
  533. # define libm_hidden_def(name) hidden_def (name)
  534. # define libm_hidden_weak(name) hidden_weak (name)
  535. # define libm_hidden_ver(local, name) hidden_ver (local, name)
  536. # define libm_hidden_data_def(name) hidden_data_def (name)
  537. # define libm_hidden_data_weak(name) hidden_data_weak (name)
  538. # define libm_hidden_data_ver(local, name) hidden_data_ver (local, name)
  539. #else
  540. # define libm_hidden_proto(name, attrs...)
  541. # define libm_hidden_def(name)
  542. # define libm_hidden_weak(name)
  543. # define libm_hidden_ver(local, name)
  544. # define libm_hidden_data_def(name)
  545. # define libm_hidden_data_weak(name)
  546. # define libm_hidden_data_ver(local, name)
  547. #endif
  548. #if defined NOT_IN_libc && defined IS_IN_libresolv
  549. # define libresolv_hidden_proto(name, attrs...) hidden_proto (name, ##attrs)
  550. # define libresolv_hidden_def(name) hidden_def (name)
  551. # define libresolv_hidden_weak(name) hidden_weak (name)
  552. # define libresolv_hidden_ver(local, name) hidden_ver (local, name)
  553. # define libresolv_hidden_data_def(name) hidden_data_def (name)
  554. # define libresolv_hidden_data_weak(name) hidden_data_weak (name)
  555. # define libresolv_hidden_data_ver(local, name) hidden_data_ver (local, name)
  556. #else
  557. # define libresolv_hidden_proto(name, attrs...)
  558. # define libresolv_hidden_def(name)
  559. # define libresolv_hidden_weak(name)
  560. # define libresolv_hidden_ver(local, name)
  561. # define libresolv_hidden_data_def(name)
  562. # define libresolv_hidden_data_weak(name)
  563. # define libresolv_hidden_data_ver(local, name)
  564. #endif
  565. #if defined NOT_IN_libc && defined IS_IN_librt
  566. # define librt_hidden_proto(name, attrs...) hidden_proto (name, ##attrs)
  567. # define librt_hidden_def(name) hidden_def (name)
  568. # define librt_hidden_weak(name) hidden_weak (name)
  569. # define librt_hidden_ver(local, name) hidden_ver (local, name)
  570. # define librt_hidden_data_def(name) hidden_data_def (name)
  571. # define librt_hidden_data_weak(name) hidden_data_weak (name)
  572. # define librt_hidden_data_ver(local, name) hidden_data_ver (local, name)
  573. #else
  574. # define librt_hidden_proto(name, attrs...)
  575. # define librt_hidden_def(name)
  576. # define librt_hidden_weak(name)
  577. # define librt_hidden_ver(local, name)
  578. # define librt_hidden_data_def(name)
  579. # define librt_hidden_data_weak(name)
  580. # define librt_hidden_data_ver(local, name)
  581. #endif
  582. #if defined NOT_IN_libc && defined IS_IN_libdl
  583. # define libdl_hidden_proto(name, attrs...) hidden_proto (name, ##attrs)
  584. # define libdl_hidden_def(name) hidden_def (name)
  585. # define libdl_hidden_weak(name) hidden_weak (name)
  586. # define libdl_hidden_ver(local, name) hidden_ver (local, name)
  587. # define libdl_hidden_data_def(name) hidden_data_def (name)
  588. # define libdl_hidden_data_weak(name) hidden_data_weak (name)
  589. # define libdl_hidden_data_ver(local, name) hidden_data_ver (local, name)
  590. #else
  591. # define libdl_hidden_proto(name, attrs...)
  592. # define libdl_hidden_def(name)
  593. # define libdl_hidden_weak(name)
  594. # define libdl_hidden_ver(local, name)
  595. # define libdl_hidden_data_def(name)
  596. # define libdl_hidden_data_weak(name)
  597. # define libdl_hidden_data_ver(local, name)
  598. #endif
  599. #if defined NOT_IN_libc && defined IS_IN_libintl
  600. # define libintl_hidden_proto(name, attrs...) hidden_proto (name, ##attrs)
  601. # define libintl_hidden_def(name) hidden_def (name)
  602. # define libintl_hidden_weak(name) hidden_weak (name)
  603. # define libintl_hidden_ver(local, name) hidden_ver (local, name)
  604. # define libintl_hidden_data_def(name) hidden_data_def (name)
  605. # define libintl_hidden_data_weak(name) hidden_data_weak (name)
  606. # define libintl_hidden_data_ver(local, name) hidden_data_ver(local, name)
  607. #else
  608. # define libintl_hidden_proto(name, attrs...)
  609. # define libintl_hidden_def(name)
  610. # define libintl_hidden_weak(name)
  611. # define libintl_hidden_ver(local, name)
  612. # define libintl_hidden_data_def(name)
  613. # define libintl_hidden_data_weak(name)
  614. # define libintl_hidden_data_ver(local, name)
  615. #endif
  616. #if defined NOT_IN_libc && defined IS_IN_libnsl
  617. # define libnsl_hidden_proto(name, attrs...) hidden_proto (name, ##attrs)
  618. # define libnsl_hidden_def(name) hidden_def (name)
  619. # define libnsl_hidden_weak(name) hidden_weak (name)
  620. # define libnsl_hidden_ver(local, name) hidden_ver (local, name)
  621. # define libnsl_hidden_data_def(name) hidden_data_def (name)
  622. # define libnsl_hidden_data_weak(name) hidden_data_weak (name)
  623. # define libnsl_hidden_data_ver(local, name) hidden_data_ver (local, name)
  624. #else
  625. # define libnsl_hidden_proto(name, attrs...)
  626. # define libnsl_hidden_def(name)
  627. # define libnsl_hidden_weak(name)
  628. # define libnsl_hidden_ver(local, name)
  629. # define libnsl_hidden_data_def(name)
  630. # define libnsl_hidden_data_weak(name)
  631. # define libnsl_hidden_data_ver(local, name)
  632. #endif
  633. #if defined NOT_IN_libc && defined IS_IN_libutil
  634. # define libutil_hidden_proto(name, attrs...) hidden_proto (name, ##attrs)
  635. # define libutil_hidden_def(name) hidden_def (name)
  636. # define libutil_hidden_weak(name) hidden_weak (name)
  637. # define libutil_hidden_ver(local, name) hidden_ver (local, name)
  638. # define libutil_hidden_data_def(name) hidden_data_def (name)
  639. # define libutil_hidden_data_weak(name) hidden_data_weak (name)
  640. # define libutil_hidden_data_ver(local, name) hidden_data_ver (local, name)
  641. #else
  642. # define libutil_hidden_proto(name, attrs...)
  643. # define libutil_hidden_def(name)
  644. # define libutil_hidden_weak(name)
  645. # define libutil_hidden_ver(local, name)
  646. # define libutil_hidden_data_def(name)
  647. # define libutil_hidden_data_weak(name)
  648. # define libutil_hidden_data_ver(local, name)
  649. #endif
  650. #if defined NOT_IN_libc && defined IS_IN_libcrypt
  651. # define libcrypt_hidden_proto(name, attrs...) hidden_proto (name, ##attrs)
  652. # define libcrypt_hidden_def(name) hidden_def (name)
  653. # define libcrypt_hidden_weak(name) hidden_weak (name)
  654. # define libcrypt_hidden_ver(local, name) hidden_ver (local, name)
  655. # define libcrypt_hidden_data_def(name) hidden_data_def (name)
  656. # define libcrypt_hidden_data_weak(name) hidden_data_weak (name)
  657. # define libcrypt_hidden_data_ver(local, name) hidden_data_ver (local, name)
  658. #else
  659. # define libcrypt_hidden_proto(name, attrs...)
  660. # define libcrypt_hidden_def(name)
  661. # define libcrypt_hidden_weak(name)
  662. # define libcrypt_hidden_ver(local, name)
  663. # define libcrypt_hidden_data_def(name)
  664. # define libcrypt_hidden_data_weak(name)
  665. # define libcrypt_hidden_data_ver(local, name)
  666. #endif
  667. #if defined NOT_IN_libc && defined IS_IN_libpthread
  668. # define libpthread_hidden_proto(name, attrs...) hidden_proto (name, ##attrs)
  669. # define libpthread_hidden_def(name) hidden_def (name)
  670. # define libpthread_hidden_weak(name) hidden_weak (name)
  671. # define libpthread_hidden_ver(local, name) hidden_ver (local, name)
  672. # define libpthread_hidden_data_def(name) hidden_data_def (name)
  673. # define libpthread_hidden_data_weak(name) hidden_data_weak (name)
  674. # define libpthread_hidden_data_ver(local, name) hidden_data_ver (local, name)
  675. #else
  676. # define libpthread_hidden_proto(name, attrs...)
  677. # define libpthread_hidden_def(name)
  678. # define libpthread_hidden_weak(name)
  679. # define libpthread_hidden_ver(local, name)
  680. # define libpthread_hidden_data_def(name)
  681. # define libpthread_hidden_data_weak(name)
  682. # define libpthread_hidden_data_ver(local, name)
  683. #endif
  684. #endif /* libc-symbols.h */