選択できるのは25トピックまでです。 トピックは、先頭が英数字で、英数字とダッシュ('-')を使用した35文字以内のものにしてください。

compiler.h 23KB

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  1. #ifndef COMPILER_H
  2. #define COMPILER_H
  3. /*
  4. * Doxygen can't cope with some of the more esoteric areas of C, so we
  5. * make its life simpler.
  6. *
  7. */
  8. #ifdef DOXYGEN
  9. #define __attribute__(x)
  10. #endif
  11. /** @file
  12. *
  13. * Global compiler definitions.
  14. *
  15. * This file is implicitly included by every @c .c file in Etherboot.
  16. * It defines global macros such as DBG().
  17. *
  18. * We arrange for each object to export the symbol @c obj_OBJECT
  19. * (where @c OBJECT is the object name, e.g. @c rtl8139) as a global
  20. * symbol, so that the linker can drag in selected object files from
  21. * the library using <tt> -u obj_OBJECT </tt>.
  22. *
  23. */
  24. /* Force visibility of all symbols to "hidden", i.e. inform gcc that
  25. * all symbol references resolve strictly within our final binary.
  26. * This avoids unnecessary PLT/GOT entries on x86_64.
  27. *
  28. * This is a stronger claim than specifying "-fvisibility=hidden",
  29. * since it also affects symbols marked with "extern".
  30. */
  31. #ifndef ASSEMBLY
  32. #if __GNUC__ >= 4
  33. #pragma GCC visibility push(hidden)
  34. #endif
  35. #endif /* ASSEMBLY */
  36. #undef _S1
  37. #undef _S2
  38. #undef _C1
  39. #undef _C2
  40. /** Concatenate non-expanded arguments */
  41. #define _C1( x, y ) x ## y
  42. /** Concatenate expanded arguments */
  43. #define _C2( x, y ) _C1 ( x, y )
  44. /** Stringify non-expanded argument */
  45. #define _S1( x ) #x
  46. /** Stringify expanded argument */
  47. #define _S2( x ) _S1 ( x )
  48. /* Assembler section types */
  49. #ifdef ASSEMBLY
  50. #define PROGBITS _C2 ( ASM_TCHAR, progbits )
  51. #define NOBITS _C2 ( ASM_TCHAR, nobits )
  52. #else
  53. #define PROGBITS_OPS _S2 ( ASM_TCHAR_OPS ) "progbits"
  54. #define PROGBITS _S2 ( ASM_TCHAR ) "progbits"
  55. #define NOBITS_OPS _S2 ( ASM_TCHAR_OPS ) "nobits"
  56. #define NOBITS _S2 ( ASM_TCHAR ) "nobits"
  57. #endif
  58. /**
  59. * @defgroup symmacros Macros to provide or require explicit symbols
  60. * @{
  61. */
  62. /**
  63. * Provide a symbol within this object file
  64. *
  65. * @v symbol Symbol name
  66. */
  67. #ifdef ASSEMBLY
  68. #define PROVIDE_SYMBOL( symbol ) \
  69. .section ".provided", "a", NOBITS ; \
  70. .hidden symbol ; \
  71. .globl symbol ; \
  72. symbol: ; \
  73. .previous
  74. #else
  75. #define PROVIDE_SYMBOL( symbol ) \
  76. char symbol[0] \
  77. __attribute__ (( section ( ".provided" ) ))
  78. #endif
  79. /**
  80. * Request a symbol
  81. *
  82. * @v symbol Symbol name
  83. *
  84. * Request a symbol to be included within the link. If the symbol
  85. * cannot be found, the link will succeed anyway.
  86. */
  87. #ifdef ASSEMBLY
  88. #define REQUEST_SYMBOL( symbol ) \
  89. .equ __request_ ## symbol, symbol
  90. #else
  91. #define REQUEST_SYMBOL( symbol ) \
  92. __asm__ ( ".equ __request_" #symbol ", " #symbol )
  93. #endif
  94. /**
  95. * Require a symbol
  96. *
  97. * @v symbol Symbol name
  98. *
  99. * Require a symbol to be included within the link. If the symbol
  100. * cannot be found, the link will fail.
  101. *
  102. * To use this macro within a file, you must also specify the file's
  103. * "requiring symbol" using the REQUIRING_SYMBOL() or
  104. * PROVIDE_REQUIRING_SYMBOL() macros.
  105. */
  106. #ifdef ASSEMBLY
  107. #define REQUIRE_SYMBOL( symbol ) \
  108. .reloc __requiring_symbol__, RELOC_TYPE_NONE, symbol
  109. #else
  110. #define REQUIRE_SYMBOL( symbol ) \
  111. __asm__ ( ".reloc __requiring_symbol__, " \
  112. _S2 ( RELOC_TYPE_NONE ) ", " #symbol )
  113. #endif
  114. /**
  115. * Specify the file's requiring symbol
  116. *
  117. * @v symbol Symbol name
  118. *
  119. * REQUIRE_SYMBOL() works by defining a dummy relocation record
  120. * against a nominated "requiring symbol". The presence of the
  121. * nominated requiring symbol will drag in all of the symbols
  122. * specified using REQUIRE_SYMBOL().
  123. */
  124. #ifdef ASSEMBLY
  125. #define REQUIRING_SYMBOL( symbol ) \
  126. .equ __requiring_symbol__, symbol
  127. #else
  128. #define REQUIRING_SYMBOL( symbol ) \
  129. __asm__ ( ".equ __requiring_symbol__, " #symbol )
  130. #endif
  131. /**
  132. * Provide a file's requiring symbol
  133. *
  134. * If the file contains no symbols that can be used as the requiring
  135. * symbol, you can provide a dummy one-byte-long symbol using
  136. * PROVIDE_REQUIRING_SYMBOL().
  137. */
  138. #ifdef ASSEMBLY
  139. #define PROVIDE_REQUIRING_SYMBOL() \
  140. .section ".tbl.requiring_symbols", "a", PROGBITS ; \
  141. __requiring_symbol__: .byte 0 ; \
  142. .size __requiring_symbol__, . - __requiring_symbol__ ; \
  143. .previous
  144. #else
  145. #define PROVIDE_REQUIRING_SYMBOL() \
  146. __asm__ ( ".section \".tbl.requiring_symbols\", " \
  147. " \"a\", " PROGBITS "\n" \
  148. "__requiring_symbol__:\t.byte 0\n" \
  149. ".size __requiring_symbol__, " \
  150. " . - __requiring_symbol__\n" \
  151. ".previous" )
  152. #endif
  153. /** @} */
  154. /**
  155. * @defgroup objmacros Macros to provide or require explicit objects
  156. * @{
  157. */
  158. #define PREFIX_OBJECT( _prefix ) _C2 ( _prefix, OBJECT )
  159. #define OBJECT_SYMBOL PREFIX_OBJECT ( obj_ )
  160. /** Always provide the symbol for the current object (defined by -DOBJECT) */
  161. PROVIDE_SYMBOL ( OBJECT_SYMBOL );
  162. /**
  163. * Request an object
  164. *
  165. * @v object Object name
  166. *
  167. * Request an object to be included within the link. If the object
  168. * cannot be found, the link will succeed anyway.
  169. */
  170. #define REQUEST_OBJECT( object ) REQUEST_SYMBOL ( obj_ ## object )
  171. /**
  172. * Require an object
  173. *
  174. * @v object Object name
  175. *
  176. * Require an object to be included within the link. If the object
  177. * cannot be found, the link will fail.
  178. *
  179. * To use this macro within a file, you must also specify the file's
  180. * "requiring symbol" using the REQUIRING_SYMBOL() or
  181. * PROVIDE_REQUIRING_SYMBOL() macros.
  182. */
  183. #define REQUIRE_OBJECT( object ) REQUIRE_SYMBOL ( obj_ ## object )
  184. /** @} */
  185. /** Select file identifier for errno.h (if used) */
  186. #define ERRFILE PREFIX_OBJECT ( ERRFILE_ )
  187. #ifndef ASSEMBLY
  188. /** Declare a function as weak (use *before* the definition)
  189. *
  190. * Due to a bug in at least GCC 4.4.4 and earlier, weak symbols may be
  191. * inlined if they have hidden visibility (see above for why hidden
  192. * visibility is used). This results in the non-weak symbol never
  193. * being used, so explicitly mark the function as noinline to prevent
  194. * inlining.
  195. */
  196. #define __weak __attribute__ (( weak, noinline ))
  197. #endif
  198. /** @defgroup dbg Debugging infrastructure
  199. * @{
  200. */
  201. /** @def DBG
  202. *
  203. * Print a debugging message.
  204. *
  205. * The debug level is set at build time by specifying the @c DEBUG=
  206. * parameter on the @c make command line. For example, to enable
  207. * debugging for the PCI bus functions (in pci.c) in a @c .dsk image
  208. * for the @c rtl8139 card, you could use the command line
  209. *
  210. * @code
  211. *
  212. * make bin/rtl8139.dsk DEBUG=pci
  213. *
  214. * @endcode
  215. *
  216. * This will enable the debugging statements (DBG()) in pci.c. If
  217. * debugging is not enabled, DBG() statements will be ignored.
  218. *
  219. * You can enable debugging in several objects simultaneously by
  220. * separating them with commas, as in
  221. *
  222. * @code
  223. *
  224. * make bin/rtl8139.dsk DEBUG=pci,buffer,heap
  225. *
  226. * @endcode
  227. *
  228. * You can increase the debugging level for an object by specifying it
  229. * with @c :N, where @c N is the level, as in
  230. *
  231. * @code
  232. *
  233. * make bin/rtl8139.dsk DEBUG=pci,buffer:2,heap
  234. *
  235. * @endcode
  236. *
  237. * which would enable debugging for the PCI, buffer-handling and
  238. * heap-allocation code, with the buffer-handling code at level 2.
  239. *
  240. */
  241. #ifndef DBGLVL_MAX
  242. #define NDEBUG
  243. #define DBGLVL_MAX 0
  244. #endif
  245. #ifndef ASSEMBLY
  246. /** printf() for debugging */
  247. extern void __attribute__ (( format ( printf, 1, 2 ) ))
  248. dbg_printf ( const char *fmt, ... );
  249. extern void dbg_autocolourise ( unsigned long id );
  250. extern void dbg_decolourise ( void );
  251. extern void dbg_hex_dump_da ( unsigned long dispaddr,
  252. const void *data, unsigned long len );
  253. extern void dbg_md5_da ( unsigned long dispaddr,
  254. const void *data, unsigned long len );
  255. extern void dbg_pause ( void );
  256. extern void dbg_more ( void );
  257. /* Allow for selective disabling of enabled debug levels */
  258. #if DBGLVL_MAX
  259. int __debug_disable;
  260. #define DBGLVL ( DBGLVL_MAX & ~__debug_disable )
  261. #define DBG_DISABLE( level ) do { \
  262. __debug_disable |= (level); \
  263. } while ( 0 )
  264. #define DBG_ENABLE( level ) do { \
  265. __debug_disable &= ~(level); \
  266. } while ( 0 )
  267. #else
  268. #define DBGLVL 0
  269. #define DBG_DISABLE( level ) do { } while ( 0 )
  270. #define DBG_ENABLE( level ) do { } while ( 0 )
  271. #endif
  272. #define DBGLVL_LOG 1
  273. #define DBG_LOG ( DBGLVL & DBGLVL_LOG )
  274. #define DBGLVL_EXTRA 2
  275. #define DBG_EXTRA ( DBGLVL & DBGLVL_EXTRA )
  276. #define DBGLVL_PROFILE 4
  277. #define DBG_PROFILE ( DBGLVL & DBGLVL_PROFILE )
  278. #define DBGLVL_IO 8
  279. #define DBG_IO ( DBGLVL & DBGLVL_IO )
  280. /**
  281. * Print debugging message if we are at a certain debug level
  282. *
  283. * @v level Debug level
  284. * @v ... printf() argument list
  285. */
  286. #define DBG_IF( level, ... ) do { \
  287. if ( DBG_ ## level ) { \
  288. dbg_printf ( __VA_ARGS__ ); \
  289. } \
  290. } while ( 0 )
  291. /**
  292. * Print a hex dump if we are at a certain debug level
  293. *
  294. * @v level Debug level
  295. * @v dispaddr Display address
  296. * @v data Data to print
  297. * @v len Length of data
  298. */
  299. #define DBG_HDA_IF( level, dispaddr, data, len ) do { \
  300. if ( DBG_ ## level ) { \
  301. union { \
  302. unsigned long ul; \
  303. typeof ( dispaddr ) raw; \
  304. } da; \
  305. da.ul = 0; \
  306. da.raw = dispaddr; \
  307. dbg_hex_dump_da ( da.ul, data, len ); \
  308. } \
  309. } while ( 0 )
  310. /**
  311. * Print a hex dump if we are at a certain debug level
  312. *
  313. * @v level Debug level
  314. * @v data Data to print
  315. * @v len Length of data
  316. */
  317. #define DBG_HD_IF( level, data, len ) do { \
  318. const void *_data = data; \
  319. DBG_HDA_IF ( level, _data, _data, len ); \
  320. } while ( 0 )
  321. /**
  322. * Print an MD5 checksum if we are at a certain debug level
  323. *
  324. * @v level Debug level
  325. * @v dispaddr Display address
  326. * @v data Data to print
  327. * @v len Length of data
  328. */
  329. #define DBG_MD5A_IF( level, dispaddr, data, len ) do { \
  330. if ( DBG_ ## level ) { \
  331. union { \
  332. unsigned long ul; \
  333. typeof ( dispaddr ) raw; \
  334. } da; \
  335. da.ul = 0; \
  336. da.raw = dispaddr; \
  337. dbg_md5_da ( da.ul, data, len ); \
  338. } \
  339. } while ( 0 )
  340. /**
  341. * Print an MD5 checksum if we are at a certain debug level
  342. *
  343. * @v level Debug level
  344. * @v data Data to print
  345. * @v len Length of data
  346. */
  347. #define DBG_MD5_IF( level, data, len ) do { \
  348. const void *_data = data; \
  349. DBG_MD5A_IF ( level, _data, _data, len ); \
  350. } while ( 0 )
  351. /**
  352. * Prompt for key press if we are at a certain debug level
  353. *
  354. * @v level Debug level
  355. */
  356. #define DBG_PAUSE_IF( level ) do { \
  357. if ( DBG_ ## level ) { \
  358. dbg_pause(); \
  359. } \
  360. } while ( 0 )
  361. /**
  362. * Prompt for more output data if we are at a certain debug level
  363. *
  364. * @v level Debug level
  365. */
  366. #define DBG_MORE_IF( level ) do { \
  367. if ( DBG_ ## level ) { \
  368. dbg_more(); \
  369. } \
  370. } while ( 0 )
  371. /**
  372. * Select colour for debug messages if we are at a certain debug level
  373. *
  374. * @v level Debug level
  375. * @v id Message stream ID
  376. */
  377. #define DBG_AC_IF( level, id ) do { \
  378. if ( DBG_ ## level ) { \
  379. union { \
  380. unsigned long ul; \
  381. typeof ( id ) raw; \
  382. } dbg_stream; \
  383. dbg_stream.ul = 0; \
  384. dbg_stream.raw = id; \
  385. dbg_autocolourise ( dbg_stream.ul ); \
  386. } \
  387. } while ( 0 )
  388. /**
  389. * Revert colour for debug messages if we are at a certain debug level
  390. *
  391. * @v level Debug level
  392. */
  393. #define DBG_DC_IF( level ) do { \
  394. if ( DBG_ ## level ) { \
  395. dbg_decolourise(); \
  396. } \
  397. } while ( 0 )
  398. /* Autocolourising versions of the DBGxxx_IF() macros */
  399. #define DBGC_IF( level, id, ... ) do { \
  400. DBG_AC_IF ( level, id ); \
  401. DBG_IF ( level, __VA_ARGS__ ); \
  402. DBG_DC_IF ( level ); \
  403. } while ( 0 )
  404. #define DBGC_HDA_IF( level, id, ... ) do { \
  405. DBG_AC_IF ( level, id ); \
  406. DBG_HDA_IF ( level, __VA_ARGS__ ); \
  407. DBG_DC_IF ( level ); \
  408. } while ( 0 )
  409. #define DBGC_HD_IF( level, id, ... ) do { \
  410. DBG_AC_IF ( level, id ); \
  411. DBG_HD_IF ( level, __VA_ARGS__ ); \
  412. DBG_DC_IF ( level ); \
  413. } while ( 0 )
  414. #define DBGC_MD5A_IF( level, id, ... ) do { \
  415. DBG_AC_IF ( level, id ); \
  416. DBG_MD5A_IF ( level, __VA_ARGS__ ); \
  417. DBG_DC_IF ( level ); \
  418. } while ( 0 )
  419. #define DBGC_MD5_IF( level, id, ... ) do { \
  420. DBG_AC_IF ( level, id ); \
  421. DBG_MD5_IF ( level, __VA_ARGS__ ); \
  422. DBG_DC_IF ( level ); \
  423. } while ( 0 )
  424. #define DBGC_PAUSE_IF( level, id ) do { \
  425. DBG_AC_IF ( level, id ); \
  426. DBG_PAUSE_IF ( level ); \
  427. DBG_DC_IF ( level ); \
  428. } while ( 0 )
  429. #define DBGC_MORE_IF( level, id ) do { \
  430. DBG_AC_IF ( level, id ); \
  431. DBG_MORE_IF ( level ); \
  432. DBG_DC_IF ( level ); \
  433. } while ( 0 )
  434. /* Versions of the DBGxxx_IF() macros that imply DBGxxx_IF( LOG, ... )*/
  435. #define DBG( ... ) DBG_IF ( LOG, ##__VA_ARGS__ )
  436. #define DBG_HDA( ... ) DBG_HDA_IF ( LOG, ##__VA_ARGS__ )
  437. #define DBG_HD( ... ) DBG_HD_IF ( LOG, ##__VA_ARGS__ )
  438. #define DBG_MD5A( ... ) DBG_MD5A_IF ( LOG, ##__VA_ARGS__ )
  439. #define DBG_MD5( ... ) DBG_MD5_IF ( LOG, ##__VA_ARGS__ )
  440. #define DBG_PAUSE( ... ) DBG_PAUSE_IF ( LOG, ##__VA_ARGS__ )
  441. #define DBG_MORE( ... ) DBG_MORE_IF ( LOG, ##__VA_ARGS__ )
  442. #define DBGC( ... ) DBGC_IF ( LOG, ##__VA_ARGS__ )
  443. #define DBGC_HDA( ... ) DBGC_HDA_IF ( LOG, ##__VA_ARGS__ )
  444. #define DBGC_HD( ... ) DBGC_HD_IF ( LOG, ##__VA_ARGS__ )
  445. #define DBGC_MD5A( ... ) DBGC_MD5A_IF ( LOG, ##__VA_ARGS__ )
  446. #define DBGC_MD5( ... ) DBGC_MD5_IF ( LOG, ##__VA_ARGS__ )
  447. #define DBGC_PAUSE( ... ) DBGC_PAUSE_IF ( LOG, ##__VA_ARGS__ )
  448. #define DBGC_MORE( ... ) DBGC_MORE_IF ( LOG, ##__VA_ARGS__ )
  449. /* Versions of the DBGxxx_IF() macros that imply DBGxxx_IF( EXTRA, ... )*/
  450. #define DBG2( ... ) DBG_IF ( EXTRA, ##__VA_ARGS__ )
  451. #define DBG2_HDA( ... ) DBG_HDA_IF ( EXTRA, ##__VA_ARGS__ )
  452. #define DBG2_HD( ... ) DBG_HD_IF ( EXTRA, ##__VA_ARGS__ )
  453. #define DBG2_MD5A( ... ) DBG_MD5A_IF ( EXTRA, ##__VA_ARGS__ )
  454. #define DBG2_MD5( ... ) DBG_MD5_IF ( EXTRA, ##__VA_ARGS__ )
  455. #define DBG2_PAUSE( ... ) DBG_PAUSE_IF ( EXTRA, ##__VA_ARGS__ )
  456. #define DBG2_MORE( ... ) DBG_MORE_IF ( EXTRA, ##__VA_ARGS__ )
  457. #define DBGC2( ... ) DBGC_IF ( EXTRA, ##__VA_ARGS__ )
  458. #define DBGC2_HDA( ... ) DBGC_HDA_IF ( EXTRA, ##__VA_ARGS__ )
  459. #define DBGC2_HD( ... ) DBGC_HD_IF ( EXTRA, ##__VA_ARGS__ )
  460. #define DBGC2_MD5A( ... ) DBGC_MD5A_IF ( EXTRA, ##__VA_ARGS__ )
  461. #define DBGC2_MD5( ... ) DBGC_MD5_IF ( EXTRA, ##__VA_ARGS__ )
  462. #define DBGC2_PAUSE( ... ) DBGC_PAUSE_IF ( EXTRA, ##__VA_ARGS__ )
  463. #define DBGC2_MORE( ... ) DBGC_MORE_IF ( EXTRA, ##__VA_ARGS__ )
  464. /* Versions of the DBGxxx_IF() macros that imply DBGxxx_IF( PROFILE, ... )*/
  465. #define DBGP( ... ) DBG_IF ( PROFILE, ##__VA_ARGS__ )
  466. #define DBGP_HDA( ... ) DBG_HDA_IF ( PROFILE, ##__VA_ARGS__ )
  467. #define DBGP_HD( ... ) DBG_HD_IF ( PROFILE, ##__VA_ARGS__ )
  468. #define DBGP_MD5A( ... ) DBG_MD5A_IF ( PROFILE, ##__VA_ARGS__ )
  469. #define DBGP_MD5( ... ) DBG_MD5_IF ( PROFILE, ##__VA_ARGS__ )
  470. #define DBGP_PAUSE( ... ) DBG_PAUSE_IF ( PROFILE, ##__VA_ARGS__ )
  471. #define DBGP_MORE( ... ) DBG_MORE_IF ( PROFILE, ##__VA_ARGS__ )
  472. #define DBGCP( ... ) DBGC_IF ( PROFILE, ##__VA_ARGS__ )
  473. #define DBGCP_HDA( ... ) DBGC_HDA_IF ( PROFILE, ##__VA_ARGS__ )
  474. #define DBGCP_HD( ... ) DBGC_HD_IF ( PROFILE, ##__VA_ARGS__ )
  475. #define DBGCP_MD5A( ... ) DBGC_MD5A_IF ( PROFILE, ##__VA_ARGS__ )
  476. #define DBGCP_MD5( ... ) DBGC_MD5_IF ( PROFILE, ##__VA_ARGS__ )
  477. #define DBGCP_PAUSE( ... ) DBGC_PAUSE_IF ( PROFILE, ##__VA_ARGS__ )
  478. #define DBGCP_MORE( ... ) DBGC_MORE_IF ( PROFILE, ##__VA_ARGS__ )
  479. /* Versions of the DBGxxx_IF() macros that imply DBGxxx_IF( IO, ... )*/
  480. #define DBGIO( ... ) DBG_IF ( IO, ##__VA_ARGS__ )
  481. #define DBGIO_HDA( ... ) DBG_HDA_IF ( IO, ##__VA_ARGS__ )
  482. #define DBGIO_HD( ... ) DBG_HD_IF ( IO, ##__VA_ARGS__ )
  483. #define DBGIO_MD5A( ... ) DBG_MD5A_IF ( IO, ##__VA_ARGS__ )
  484. #define DBGIO_MD5( ... ) DBG_MD5_IF ( IO, ##__VA_ARGS__ )
  485. #define DBGIO_PAUSE( ... ) DBG_PAUSE_IF ( IO, ##__VA_ARGS__ )
  486. #define DBGIO_MORE( ... ) DBG_MORE_IF ( IO, ##__VA_ARGS__ )
  487. #define DBGCIO( ... ) DBGC_IF ( IO, ##__VA_ARGS__ )
  488. #define DBGCIO_HDA( ... ) DBGC_HDA_IF ( IO, ##__VA_ARGS__ )
  489. #define DBGCIO_HD( ... ) DBGC_HD_IF ( IO, ##__VA_ARGS__ )
  490. #define DBGCIO_MD5A( ... ) DBGC_MD5A_IF ( IO, ##__VA_ARGS__ )
  491. #define DBGCIO_MD5( ... ) DBGC_MD5_IF ( IO, ##__VA_ARGS__ )
  492. #define DBGCIO_PAUSE( ... ) DBGC_PAUSE_IF ( IO, ##__VA_ARGS__ )
  493. #define DBGCIO_MORE( ... ) DBGC_MORE_IF ( IO, ##__VA_ARGS__ )
  494. #endif /* ASSEMBLY */
  495. /** @} */
  496. /** @defgroup attrs Miscellaneous attributes
  497. * @{
  498. */
  499. #ifndef ASSEMBLY
  500. /** Declare a variable or data structure as unused. */
  501. #define __unused __attribute__ (( unused ))
  502. /**
  503. * Declare a function as pure - i.e. without side effects
  504. */
  505. #define __pure __attribute__ (( pure ))
  506. /**
  507. * Declare a function as const - i.e. it does not access global memory
  508. * (including dereferencing pointers passed to it) at all.
  509. * Must also not call any non-const functions.
  510. */
  511. #define __const __attribute__ (( const ))
  512. /**
  513. * Declare a function's pointer parameters as non-null - i.e. force
  514. * compiler to check pointers at compile time and enable possible
  515. * optimizations based on that fact
  516. */
  517. #define __nonnull __attribute__ (( nonnull ))
  518. /**
  519. * Declare a pointer returned by a function as a unique memory address
  520. * as returned by malloc-type functions.
  521. */
  522. #define __malloc __attribute__ (( malloc ))
  523. /**
  524. * Declare a function as used.
  525. *
  526. * Necessary only if the function is called only from assembler code.
  527. */
  528. #define __used __attribute__ (( used ))
  529. /** Declare a data structure to be aligned with 16-byte alignment */
  530. #define __aligned __attribute__ (( aligned ( 16 ) ))
  531. /** Declare a function to be always inline */
  532. #define __always_inline __attribute__ (( always_inline ))
  533. /* Force all inline functions to not be instrumented
  534. *
  535. * This is required to cope with what seems to be a long-standing gcc
  536. * bug, in which -finstrument-functions will cause instances of
  537. * inlined functions to be reported as further calls to the
  538. * *containing* function. This makes instrumentation very difficult
  539. * to use.
  540. *
  541. * Work around this problem by adding the no_instrument_function
  542. * attribute to all inlined functions.
  543. */
  544. #define inline inline __attribute__ (( no_instrument_function ))
  545. /**
  546. * Shared data.
  547. *
  548. * To save space in the binary when multiple-driver images are
  549. * compiled, uninitialised data areas can be shared between drivers.
  550. * This will typically be used to share statically-allocated receive
  551. * and transmit buffers between drivers.
  552. *
  553. * Use as e.g.
  554. *
  555. * @code
  556. *
  557. * struct {
  558. * char rx_buf[NUM_RX_BUF][RX_BUF_SIZE];
  559. * char tx_buf[TX_BUF_SIZE];
  560. * } my_static_data __shared;
  561. *
  562. * @endcode
  563. *
  564. */
  565. #define __shared __asm__ ( "_shared_bss" ) __aligned
  566. #endif /* ASSEMBLY */
  567. /** @} */
  568. /**
  569. * Optimisation barrier
  570. */
  571. #ifndef ASSEMBLY
  572. #define barrier() __asm__ __volatile__ ( "" : : : "memory" )
  573. #endif /* ASSEMBLY */
  574. /**
  575. * @defgroup licences Licence declarations
  576. *
  577. * For reasons that are partly historical, various different files
  578. * within the iPXE codebase have differing licences.
  579. *
  580. * @{
  581. */
  582. /** Declare a file as being in the public domain
  583. *
  584. * This licence declaration is applicable when a file states itself to
  585. * be in the public domain.
  586. */
  587. #define FILE_LICENCE_PUBLIC_DOMAIN \
  588. PROVIDE_SYMBOL ( PREFIX_OBJECT ( __licence__public_domain__ ) )
  589. /** Declare a file as being under version 2 (or later) of the GNU GPL
  590. *
  591. * This licence declaration is applicable when a file states itself to
  592. * be licensed under the GNU GPL; "either version 2 of the License, or
  593. * (at your option) any later version".
  594. */
  595. #define FILE_LICENCE_GPL2_OR_LATER \
  596. PROVIDE_SYMBOL ( PREFIX_OBJECT ( __licence__gpl2_or_later__ ) )
  597. /** Declare a file as being under version 2 of the GNU GPL
  598. *
  599. * This licence declaration is applicable when a file states itself to
  600. * be licensed under version 2 of the GPL, and does not include the
  601. * "or, at your option, any later version" clause.
  602. */
  603. #define FILE_LICENCE_GPL2_ONLY \
  604. PROVIDE_SYMBOL ( PREFIX_OBJECT ( __licence__gpl2_only__ ) )
  605. /** Declare a file as being under any version of the GNU GPL
  606. *
  607. * This licence declaration is applicable when a file states itself to
  608. * be licensed under the GPL, but does not specify a version.
  609. *
  610. * According to section 9 of the GPLv2, "If the Program does not
  611. * specify a version number of this License, you may choose any
  612. * version ever published by the Free Software Foundation".
  613. */
  614. #define FILE_LICENCE_GPL_ANY \
  615. PROVIDE_SYMBOL ( PREFIX_OBJECT ( __licence__gpl_any__ ) )
  616. /** Declare a file as being under the three-clause BSD licence
  617. *
  618. * This licence declaration is applicable when a file states itself to
  619. * be licensed under terms allowing redistribution in source and
  620. * binary forms (with or without modification) provided that:
  621. *
  622. * redistributions of source code retain the copyright notice,
  623. * list of conditions and any attached disclaimers
  624. *
  625. * redistributions in binary form reproduce the copyright notice,
  626. * list of conditions and any attached disclaimers in the
  627. * documentation and/or other materials provided with the
  628. * distribution
  629. *
  630. * the name of the author is not used to endorse or promote
  631. * products derived from the software without specific prior
  632. * written permission
  633. *
  634. * It is not necessary for the file to explicitly state that it is
  635. * under a "BSD" licence; only that the licensing terms be
  636. * functionally equivalent to the standard three-clause BSD licence.
  637. */
  638. #define FILE_LICENCE_BSD3 \
  639. PROVIDE_SYMBOL ( PREFIX_OBJECT ( __licence__bsd3__ ) )
  640. /** Declare a file as being under the two-clause BSD licence
  641. *
  642. * This licence declaration is applicable when a file states itself to
  643. * be licensed under terms allowing redistribution in source and
  644. * binary forms (with or without modification) provided that:
  645. *
  646. * redistributions of source code retain the copyright notice,
  647. * list of conditions and any attached disclaimers
  648. *
  649. * redistributions in binary form reproduce the copyright notice,
  650. * list of conditions and any attached disclaimers in the
  651. * documentation and/or other materials provided with the
  652. * distribution
  653. *
  654. * It is not necessary for the file to explicitly state that it is
  655. * under a "BSD" licence; only that the licensing terms be
  656. * functionally equivalent to the standard two-clause BSD licence.
  657. */
  658. #define FILE_LICENCE_BSD2 \
  659. PROVIDE_SYMBOL ( PREFIX_OBJECT ( __licence__bsd2__ ) )
  660. /** Declare a file as being under the one-clause MIT-style licence
  661. *
  662. * This licence declaration is applicable when a file states itself to
  663. * be licensed under terms allowing redistribution for any purpose
  664. * with or without fee, provided that the copyright notice and
  665. * permission notice appear in all copies.
  666. */
  667. #define FILE_LICENCE_MIT \
  668. PROVIDE_SYMBOL ( PREFIX_OBJECT ( __licence__mit__ ) )
  669. /** Declare a file as being under GPLv2+ or UBDL
  670. *
  671. * This licence declaration is applicable when a file states itself to
  672. * be licensed under the GNU GPL; "either version 2 of the License, or
  673. * (at your option) any later version" and also states that it may be
  674. * distributed under the terms of the Unmodified Binary Distribution
  675. * Licence (as given in the file COPYING.UBDL).
  676. */
  677. #define FILE_LICENCE_GPL2_OR_LATER_OR_UBDL \
  678. PROVIDE_SYMBOL ( PREFIX_OBJECT ( __licence__gpl2_or_later_or_ubdl__ ) )
  679. /** Declare a particular licence as applying to a file */
  680. #define FILE_LICENCE( _licence ) FILE_LICENCE_ ## _licence
  681. /** @} */
  682. /* This file itself is under GPLv2+/UBDL */
  683. FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
  684. #include <bits/compiler.h>
  685. #endif /* COMPILER_H */