vmlinux.lds.h 23 KB

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  1. /*
  2. * Helper macros to support writing architecture specific
  3. * linker scripts.
  4. *
  5. * A minimal linker scripts has following content:
  6. * [This is a sample, architectures may have special requiriements]
  7. *
  8. * OUTPUT_FORMAT(...)
  9. * OUTPUT_ARCH(...)
  10. * ENTRY(...)
  11. * SECTIONS
  12. * {
  13. * . = START;
  14. * __init_begin = .;
  15. * HEAD_TEXT_SECTION
  16. * INIT_TEXT_SECTION(PAGE_SIZE)
  17. * INIT_DATA_SECTION(...)
  18. * PERCPU(CACHELINE_SIZE, PAGE_SIZE)
  19. * __init_end = .;
  20. *
  21. * _stext = .;
  22. * TEXT_SECTION = 0
  23. * _etext = .;
  24. *
  25. * _sdata = .;
  26. * RO_DATA_SECTION(PAGE_SIZE)
  27. * RW_DATA_SECTION(...)
  28. * _edata = .;
  29. *
  30. * EXCEPTION_TABLE(...)
  31. * NOTES
  32. *
  33. * BSS_SECTION(0, 0, 0)
  34. * _end = .;
  35. *
  36. * STABS_DEBUG
  37. * DWARF_DEBUG
  38. *
  39. * DISCARDS // must be the last
  40. * }
  41. *
  42. * [__init_begin, __init_end] is the init section that may be freed after init
  43. * [_stext, _etext] is the text section
  44. * [_sdata, _edata] is the data section
  45. *
  46. * Some of the included output section have their own set of constants.
  47. * Examples are: [__initramfs_start, __initramfs_end] for initramfs and
  48. * [__nosave_begin, __nosave_end] for the nosave data
  49. */
  50. #ifndef LOAD_OFFSET
  51. #define LOAD_OFFSET 0
  52. #endif
  53. #ifndef SYMBOL_PREFIX
  54. #define VMLINUX_SYMBOL(sym) sym
  55. #else
  56. #define PASTE2(x,y) x##y
  57. #define PASTE(x,y) PASTE2(x,y)
  58. #define VMLINUX_SYMBOL(sym) PASTE(SYMBOL_PREFIX, sym)
  59. #endif
  60. /* Align . to a 8 byte boundary equals to maximum function alignment. */
  61. #define ALIGN_FUNCTION() . = ALIGN(8)
  62. /*
  63. * Align to a 32 byte boundary equal to the
  64. * alignment gcc 4.5 uses for a struct
  65. */
  66. #define STRUCT_ALIGNMENT 32
  67. #define STRUCT_ALIGN() . = ALIGN(STRUCT_ALIGNMENT)
  68. /* The actual configuration determine if the init/exit sections
  69. * are handled as text/data or they can be discarded (which
  70. * often happens at runtime)
  71. */
  72. #ifdef CONFIG_HOTPLUG
  73. #define DEV_KEEP(sec) *(.dev##sec)
  74. #define DEV_DISCARD(sec)
  75. #else
  76. #define DEV_KEEP(sec)
  77. #define DEV_DISCARD(sec) *(.dev##sec)
  78. #endif
  79. #ifdef CONFIG_HOTPLUG_CPU
  80. #define CPU_KEEP(sec) *(.cpu##sec)
  81. #define CPU_DISCARD(sec)
  82. #else
  83. #define CPU_KEEP(sec)
  84. #define CPU_DISCARD(sec) *(.cpu##sec)
  85. #endif
  86. #if defined(CONFIG_MEMORY_HOTPLUG)
  87. #define MEM_KEEP(sec) *(.mem##sec)
  88. #define MEM_DISCARD(sec)
  89. #else
  90. #define MEM_KEEP(sec)
  91. #define MEM_DISCARD(sec) *(.mem##sec)
  92. #endif
  93. #ifdef CONFIG_FTRACE_MCOUNT_RECORD
  94. #define MCOUNT_REC() . = ALIGN(8); \
  95. VMLINUX_SYMBOL(__start_mcount_loc) = .; \
  96. *(__mcount_loc) \
  97. VMLINUX_SYMBOL(__stop_mcount_loc) = .;
  98. #else
  99. #define MCOUNT_REC()
  100. #endif
  101. #ifdef CONFIG_TRACE_BRANCH_PROFILING
  102. #define LIKELY_PROFILE() VMLINUX_SYMBOL(__start_annotated_branch_profile) = .; \
  103. *(_ftrace_annotated_branch) \
  104. VMLINUX_SYMBOL(__stop_annotated_branch_profile) = .;
  105. #else
  106. #define LIKELY_PROFILE()
  107. #endif
  108. #ifdef CONFIG_PROFILE_ALL_BRANCHES
  109. #define BRANCH_PROFILE() VMLINUX_SYMBOL(__start_branch_profile) = .; \
  110. *(_ftrace_branch) \
  111. VMLINUX_SYMBOL(__stop_branch_profile) = .;
  112. #else
  113. #define BRANCH_PROFILE()
  114. #endif
  115. #ifdef CONFIG_EVENT_TRACING
  116. #define FTRACE_EVENTS() VMLINUX_SYMBOL(__start_ftrace_events) = .; \
  117. *(_ftrace_events) \
  118. VMLINUX_SYMBOL(__stop_ftrace_events) = .;
  119. #else
  120. #define FTRACE_EVENTS()
  121. #endif
  122. #ifdef CONFIG_TRACING
  123. #define TRACE_PRINTKS() VMLINUX_SYMBOL(__start___trace_bprintk_fmt) = .; \
  124. *(__trace_printk_fmt) /* Trace_printk fmt' pointer */ \
  125. VMLINUX_SYMBOL(__stop___trace_bprintk_fmt) = .;
  126. #else
  127. #define TRACE_PRINTKS()
  128. #endif
  129. #ifdef CONFIG_FTRACE_SYSCALLS
  130. #define TRACE_SYSCALLS() VMLINUX_SYMBOL(__start_syscalls_metadata) = .; \
  131. *(__syscalls_metadata) \
  132. VMLINUX_SYMBOL(__stop_syscalls_metadata) = .;
  133. #else
  134. #define TRACE_SYSCALLS()
  135. #endif
  136. #define KERNEL_DTB() \
  137. STRUCT_ALIGN(); \
  138. VMLINUX_SYMBOL(__dtb_start) = .; \
  139. *(.dtb.init.rodata) \
  140. VMLINUX_SYMBOL(__dtb_end) = .;
  141. /* .data section */
  142. #define DATA_DATA \
  143. *(.data) \
  144. *(.ref.data) \
  145. *(.data..shared_aligned) /* percpu related */ \
  146. DEV_KEEP(init.data) \
  147. DEV_KEEP(exit.data) \
  148. CPU_KEEP(init.data) \
  149. CPU_KEEP(exit.data) \
  150. MEM_KEEP(init.data) \
  151. MEM_KEEP(exit.data) \
  152. . = ALIGN(32); \
  153. VMLINUX_SYMBOL(__start___tracepoints) = .; \
  154. *(__tracepoints) \
  155. VMLINUX_SYMBOL(__stop___tracepoints) = .; \
  156. /* implement dynamic printk debug */ \
  157. . = ALIGN(8); \
  158. VMLINUX_SYMBOL(__start___verbose) = .; \
  159. *(__verbose) \
  160. VMLINUX_SYMBOL(__stop___verbose) = .; \
  161. LIKELY_PROFILE() \
  162. BRANCH_PROFILE() \
  163. TRACE_PRINTKS() \
  164. \
  165. STRUCT_ALIGN(); \
  166. FTRACE_EVENTS() \
  167. \
  168. STRUCT_ALIGN(); \
  169. TRACE_SYSCALLS()
  170. /*
  171. * Data section helpers
  172. */
  173. #define NOSAVE_DATA \
  174. . = ALIGN(PAGE_SIZE); \
  175. VMLINUX_SYMBOL(__nosave_begin) = .; \
  176. *(.data..nosave) \
  177. . = ALIGN(PAGE_SIZE); \
  178. VMLINUX_SYMBOL(__nosave_end) = .;
  179. #define PAGE_ALIGNED_DATA(page_align) \
  180. . = ALIGN(page_align); \
  181. *(.data..page_aligned)
  182. #define READ_MOSTLY_DATA(align) \
  183. . = ALIGN(align); \
  184. *(.data..read_mostly) \
  185. . = ALIGN(align);
  186. #define CACHELINE_ALIGNED_DATA(align) \
  187. . = ALIGN(align); \
  188. *(.data..cacheline_aligned)
  189. #define INIT_TASK_DATA(align) \
  190. . = ALIGN(align); \
  191. *(.data..init_task)
  192. /*
  193. * Read only Data
  194. */
  195. #define RO_DATA_SECTION(align) \
  196. . = ALIGN((align)); \
  197. .rodata : AT(ADDR(.rodata) - LOAD_OFFSET) { \
  198. VMLINUX_SYMBOL(__start_rodata) = .; \
  199. *(.rodata) *(.rodata.*) \
  200. *(__vermagic) /* Kernel version magic */ \
  201. *(__markers_strings) /* Markers: strings */ \
  202. *(__tracepoints_strings)/* Tracepoints: strings */ \
  203. } \
  204. \
  205. .rodata1 : AT(ADDR(.rodata1) - LOAD_OFFSET) { \
  206. *(.rodata1) \
  207. } \
  208. \
  209. BUG_TABLE \
  210. \
  211. JUMP_TABLE \
  212. \
  213. /* PCI quirks */ \
  214. .pci_fixup : AT(ADDR(.pci_fixup) - LOAD_OFFSET) { \
  215. VMLINUX_SYMBOL(__start_pci_fixups_early) = .; \
  216. *(.pci_fixup_early) \
  217. VMLINUX_SYMBOL(__end_pci_fixups_early) = .; \
  218. VMLINUX_SYMBOL(__start_pci_fixups_header) = .; \
  219. *(.pci_fixup_header) \
  220. VMLINUX_SYMBOL(__end_pci_fixups_header) = .; \
  221. VMLINUX_SYMBOL(__start_pci_fixups_final) = .; \
  222. *(.pci_fixup_final) \
  223. VMLINUX_SYMBOL(__end_pci_fixups_final) = .; \
  224. VMLINUX_SYMBOL(__start_pci_fixups_enable) = .; \
  225. *(.pci_fixup_enable) \
  226. VMLINUX_SYMBOL(__end_pci_fixups_enable) = .; \
  227. VMLINUX_SYMBOL(__start_pci_fixups_resume) = .; \
  228. *(.pci_fixup_resume) \
  229. VMLINUX_SYMBOL(__end_pci_fixups_resume) = .; \
  230. VMLINUX_SYMBOL(__start_pci_fixups_resume_early) = .; \
  231. *(.pci_fixup_resume_early) \
  232. VMLINUX_SYMBOL(__end_pci_fixups_resume_early) = .; \
  233. VMLINUX_SYMBOL(__start_pci_fixups_suspend) = .; \
  234. *(.pci_fixup_suspend) \
  235. VMLINUX_SYMBOL(__end_pci_fixups_suspend) = .; \
  236. } \
  237. \
  238. /* Built-in firmware blobs */ \
  239. .builtin_fw : AT(ADDR(.builtin_fw) - LOAD_OFFSET) { \
  240. VMLINUX_SYMBOL(__start_builtin_fw) = .; \
  241. *(.builtin_fw) \
  242. VMLINUX_SYMBOL(__end_builtin_fw) = .; \
  243. } \
  244. \
  245. /* RapidIO route ops */ \
  246. .rio_ops : AT(ADDR(.rio_ops) - LOAD_OFFSET) { \
  247. VMLINUX_SYMBOL(__start_rio_switch_ops) = .; \
  248. *(.rio_switch_ops) \
  249. VMLINUX_SYMBOL(__end_rio_switch_ops) = .; \
  250. } \
  251. \
  252. TRACEDATA \
  253. \
  254. /* Kernel symbol table: Normal symbols */ \
  255. __ksymtab : AT(ADDR(__ksymtab) - LOAD_OFFSET) { \
  256. VMLINUX_SYMBOL(__start___ksymtab) = .; \
  257. *(__ksymtab) \
  258. VMLINUX_SYMBOL(__stop___ksymtab) = .; \
  259. } \
  260. \
  261. /* Kernel symbol table: GPL-only symbols */ \
  262. __ksymtab_gpl : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) { \
  263. VMLINUX_SYMBOL(__start___ksymtab_gpl) = .; \
  264. *(__ksymtab_gpl) \
  265. VMLINUX_SYMBOL(__stop___ksymtab_gpl) = .; \
  266. } \
  267. \
  268. /* Kernel symbol table: Normal unused symbols */ \
  269. __ksymtab_unused : AT(ADDR(__ksymtab_unused) - LOAD_OFFSET) { \
  270. VMLINUX_SYMBOL(__start___ksymtab_unused) = .; \
  271. *(__ksymtab_unused) \
  272. VMLINUX_SYMBOL(__stop___ksymtab_unused) = .; \
  273. } \
  274. \
  275. /* Kernel symbol table: GPL-only unused symbols */ \
  276. __ksymtab_unused_gpl : AT(ADDR(__ksymtab_unused_gpl) - LOAD_OFFSET) { \
  277. VMLINUX_SYMBOL(__start___ksymtab_unused_gpl) = .; \
  278. *(__ksymtab_unused_gpl) \
  279. VMLINUX_SYMBOL(__stop___ksymtab_unused_gpl) = .; \
  280. } \
  281. \
  282. /* Kernel symbol table: GPL-future-only symbols */ \
  283. __ksymtab_gpl_future : AT(ADDR(__ksymtab_gpl_future) - LOAD_OFFSET) { \
  284. VMLINUX_SYMBOL(__start___ksymtab_gpl_future) = .; \
  285. *(__ksymtab_gpl_future) \
  286. VMLINUX_SYMBOL(__stop___ksymtab_gpl_future) = .; \
  287. } \
  288. \
  289. /* Kernel symbol table: Normal symbols */ \
  290. __kcrctab : AT(ADDR(__kcrctab) - LOAD_OFFSET) { \
  291. VMLINUX_SYMBOL(__start___kcrctab) = .; \
  292. *(__kcrctab) \
  293. VMLINUX_SYMBOL(__stop___kcrctab) = .; \
  294. } \
  295. \
  296. /* Kernel symbol table: GPL-only symbols */ \
  297. __kcrctab_gpl : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) { \
  298. VMLINUX_SYMBOL(__start___kcrctab_gpl) = .; \
  299. *(__kcrctab_gpl) \
  300. VMLINUX_SYMBOL(__stop___kcrctab_gpl) = .; \
  301. } \
  302. \
  303. /* Kernel symbol table: Normal unused symbols */ \
  304. __kcrctab_unused : AT(ADDR(__kcrctab_unused) - LOAD_OFFSET) { \
  305. VMLINUX_SYMBOL(__start___kcrctab_unused) = .; \
  306. *(__kcrctab_unused) \
  307. VMLINUX_SYMBOL(__stop___kcrctab_unused) = .; \
  308. } \
  309. \
  310. /* Kernel symbol table: GPL-only unused symbols */ \
  311. __kcrctab_unused_gpl : AT(ADDR(__kcrctab_unused_gpl) - LOAD_OFFSET) { \
  312. VMLINUX_SYMBOL(__start___kcrctab_unused_gpl) = .; \
  313. *(__kcrctab_unused_gpl) \
  314. VMLINUX_SYMBOL(__stop___kcrctab_unused_gpl) = .; \
  315. } \
  316. \
  317. /* Kernel symbol table: GPL-future-only symbols */ \
  318. __kcrctab_gpl_future : AT(ADDR(__kcrctab_gpl_future) - LOAD_OFFSET) { \
  319. VMLINUX_SYMBOL(__start___kcrctab_gpl_future) = .; \
  320. *(__kcrctab_gpl_future) \
  321. VMLINUX_SYMBOL(__stop___kcrctab_gpl_future) = .; \
  322. } \
  323. \
  324. /* Kernel symbol table: strings */ \
  325. __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \
  326. *(__ksymtab_strings) \
  327. } \
  328. \
  329. /* __*init sections */ \
  330. __init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) { \
  331. *(.ref.rodata) \
  332. DEV_KEEP(init.rodata) \
  333. DEV_KEEP(exit.rodata) \
  334. CPU_KEEP(init.rodata) \
  335. CPU_KEEP(exit.rodata) \
  336. MEM_KEEP(init.rodata) \
  337. MEM_KEEP(exit.rodata) \
  338. } \
  339. \
  340. /* Built-in module parameters. */ \
  341. __param : AT(ADDR(__param) - LOAD_OFFSET) { \
  342. VMLINUX_SYMBOL(__start___param) = .; \
  343. *(__param) \
  344. VMLINUX_SYMBOL(__stop___param) = .; \
  345. } \
  346. \
  347. /* Built-in module versions. */ \
  348. __modver : AT(ADDR(__modver) - LOAD_OFFSET) { \
  349. VMLINUX_SYMBOL(__start___modver) = .; \
  350. *(__modver) \
  351. VMLINUX_SYMBOL(__stop___modver) = .; \
  352. . = ALIGN((align)); \
  353. VMLINUX_SYMBOL(__end_rodata) = .; \
  354. } \
  355. . = ALIGN((align));
  356. /* RODATA & RO_DATA provided for backward compatibility.
  357. * All archs are supposed to use RO_DATA() */
  358. #define RODATA RO_DATA_SECTION(4096)
  359. #define RO_DATA(align) RO_DATA_SECTION(align)
  360. #define SECURITY_INIT \
  361. .security_initcall.init : AT(ADDR(.security_initcall.init) - LOAD_OFFSET) { \
  362. VMLINUX_SYMBOL(__security_initcall_start) = .; \
  363. *(.security_initcall.init) \
  364. VMLINUX_SYMBOL(__security_initcall_end) = .; \
  365. }
  366. /* .text section. Map to function alignment to avoid address changes
  367. * during second ld run in second ld pass when generating System.map */
  368. #define TEXT_TEXT \
  369. ALIGN_FUNCTION(); \
  370. *(.text.hot) \
  371. *(.text) \
  372. *(.ref.text) \
  373. DEV_KEEP(init.text) \
  374. DEV_KEEP(exit.text) \
  375. CPU_KEEP(init.text) \
  376. CPU_KEEP(exit.text) \
  377. MEM_KEEP(init.text) \
  378. MEM_KEEP(exit.text) \
  379. *(.text.unlikely)
  380. /* sched.text is aling to function alignment to secure we have same
  381. * address even at second ld pass when generating System.map */
  382. #define SCHED_TEXT \
  383. ALIGN_FUNCTION(); \
  384. VMLINUX_SYMBOL(__sched_text_start) = .; \
  385. *(.sched.text) \
  386. VMLINUX_SYMBOL(__sched_text_end) = .;
  387. /* spinlock.text is aling to function alignment to secure we have same
  388. * address even at second ld pass when generating System.map */
  389. #define LOCK_TEXT \
  390. ALIGN_FUNCTION(); \
  391. VMLINUX_SYMBOL(__lock_text_start) = .; \
  392. *(.spinlock.text) \
  393. VMLINUX_SYMBOL(__lock_text_end) = .;
  394. #define KPROBES_TEXT \
  395. ALIGN_FUNCTION(); \
  396. VMLINUX_SYMBOL(__kprobes_text_start) = .; \
  397. *(.kprobes.text) \
  398. VMLINUX_SYMBOL(__kprobes_text_end) = .;
  399. #ifdef CONFIG_FUNCTION_GRAPH_TRACER
  400. #define IRQENTRY_TEXT \
  401. ALIGN_FUNCTION(); \
  402. VMLINUX_SYMBOL(__irqentry_text_start) = .; \
  403. *(.irqentry.text) \
  404. VMLINUX_SYMBOL(__irqentry_text_end) = .;
  405. #else
  406. #define IRQENTRY_TEXT
  407. #endif
  408. /* Section used for early init (in .S files) */
  409. #define HEAD_TEXT *(.head.text)
  410. #define HEAD_TEXT_SECTION \
  411. .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) { \
  412. HEAD_TEXT \
  413. }
  414. /*
  415. * Exception table
  416. */
  417. #define EXCEPTION_TABLE(align) \
  418. . = ALIGN(align); \
  419. __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) { \
  420. VMLINUX_SYMBOL(__start___ex_table) = .; \
  421. *(__ex_table) \
  422. VMLINUX_SYMBOL(__stop___ex_table) = .; \
  423. }
  424. /*
  425. * Init task
  426. */
  427. #define INIT_TASK_DATA_SECTION(align) \
  428. . = ALIGN(align); \
  429. .data..init_task : AT(ADDR(.data..init_task) - LOAD_OFFSET) { \
  430. INIT_TASK_DATA(align) \
  431. }
  432. #ifdef CONFIG_CONSTRUCTORS
  433. #define KERNEL_CTORS() . = ALIGN(8); \
  434. VMLINUX_SYMBOL(__ctors_start) = .; \
  435. *(.ctors) \
  436. VMLINUX_SYMBOL(__ctors_end) = .;
  437. #else
  438. #define KERNEL_CTORS()
  439. #endif
  440. /* init and exit section handling */
  441. #define INIT_DATA \
  442. *(.init.data) \
  443. DEV_DISCARD(init.data) \
  444. CPU_DISCARD(init.data) \
  445. MEM_DISCARD(init.data) \
  446. KERNEL_CTORS() \
  447. *(.init.rodata) \
  448. MCOUNT_REC() \
  449. DEV_DISCARD(init.rodata) \
  450. CPU_DISCARD(init.rodata) \
  451. MEM_DISCARD(init.rodata) \
  452. KERNEL_DTB()
  453. #define INIT_TEXT \
  454. *(.init.text) \
  455. DEV_DISCARD(init.text) \
  456. CPU_DISCARD(init.text) \
  457. MEM_DISCARD(init.text)
  458. #define EXIT_DATA \
  459. *(.exit.data) \
  460. DEV_DISCARD(exit.data) \
  461. DEV_DISCARD(exit.rodata) \
  462. CPU_DISCARD(exit.data) \
  463. CPU_DISCARD(exit.rodata) \
  464. MEM_DISCARD(exit.data) \
  465. MEM_DISCARD(exit.rodata)
  466. #define EXIT_TEXT \
  467. *(.exit.text) \
  468. DEV_DISCARD(exit.text) \
  469. CPU_DISCARD(exit.text) \
  470. MEM_DISCARD(exit.text)
  471. #define EXIT_CALL \
  472. *(.exitcall.exit)
  473. /*
  474. * bss (Block Started by Symbol) - uninitialized data
  475. * zeroed during startup
  476. */
  477. #define SBSS(sbss_align) \
  478. . = ALIGN(sbss_align); \
  479. .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) { \
  480. *(.sbss) \
  481. *(.scommon) \
  482. }
  483. #define BSS(bss_align) \
  484. . = ALIGN(bss_align); \
  485. .bss : AT(ADDR(.bss) - LOAD_OFFSET) { \
  486. *(.bss..page_aligned) \
  487. *(.dynbss) \
  488. *(.bss) \
  489. *(COMMON) \
  490. }
  491. /*
  492. * DWARF debug sections.
  493. * Symbols in the DWARF debugging sections are relative to
  494. * the beginning of the section so we begin them at 0.
  495. */
  496. #define DWARF_DEBUG \
  497. /* DWARF 1 */ \
  498. .debug 0 : { *(.debug) } \
  499. .line 0 : { *(.line) } \
  500. /* GNU DWARF 1 extensions */ \
  501. .debug_srcinfo 0 : { *(.debug_srcinfo) } \
  502. .debug_sfnames 0 : { *(.debug_sfnames) } \
  503. /* DWARF 1.1 and DWARF 2 */ \
  504. .debug_aranges 0 : { *(.debug_aranges) } \
  505. .debug_pubnames 0 : { *(.debug_pubnames) } \
  506. /* DWARF 2 */ \
  507. .debug_info 0 : { *(.debug_info \
  508. .gnu.linkonce.wi.*) } \
  509. .debug_abbrev 0 : { *(.debug_abbrev) } \
  510. .debug_line 0 : { *(.debug_line) } \
  511. .debug_frame 0 : { *(.debug_frame) } \
  512. .debug_str 0 : { *(.debug_str) } \
  513. .debug_loc 0 : { *(.debug_loc) } \
  514. .debug_macinfo 0 : { *(.debug_macinfo) } \
  515. /* SGI/MIPS DWARF 2 extensions */ \
  516. .debug_weaknames 0 : { *(.debug_weaknames) } \
  517. .debug_funcnames 0 : { *(.debug_funcnames) } \
  518. .debug_typenames 0 : { *(.debug_typenames) } \
  519. .debug_varnames 0 : { *(.debug_varnames) } \
  520. /* Stabs debugging sections. */
  521. #define STABS_DEBUG \
  522. .stab 0 : { *(.stab) } \
  523. .stabstr 0 : { *(.stabstr) } \
  524. .stab.excl 0 : { *(.stab.excl) } \
  525. .stab.exclstr 0 : { *(.stab.exclstr) } \
  526. .stab.index 0 : { *(.stab.index) } \
  527. .stab.indexstr 0 : { *(.stab.indexstr) } \
  528. .comment 0 : { *(.comment) }
  529. #ifdef CONFIG_GENERIC_BUG
  530. #define BUG_TABLE \
  531. . = ALIGN(8); \
  532. __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) { \
  533. VMLINUX_SYMBOL(__start___bug_table) = .; \
  534. *(__bug_table) \
  535. VMLINUX_SYMBOL(__stop___bug_table) = .; \
  536. }
  537. #else
  538. #define BUG_TABLE
  539. #endif
  540. #define JUMP_TABLE \
  541. . = ALIGN(8); \
  542. __jump_table : AT(ADDR(__jump_table) - LOAD_OFFSET) { \
  543. VMLINUX_SYMBOL(__start___jump_table) = .; \
  544. *(__jump_table) \
  545. VMLINUX_SYMBOL(__stop___jump_table) = .; \
  546. }
  547. #ifdef CONFIG_PM_TRACE
  548. #define TRACEDATA \
  549. . = ALIGN(4); \
  550. .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) { \
  551. VMLINUX_SYMBOL(__tracedata_start) = .; \
  552. *(.tracedata) \
  553. VMLINUX_SYMBOL(__tracedata_end) = .; \
  554. }
  555. #else
  556. #define TRACEDATA
  557. #endif
  558. #define NOTES \
  559. .notes : AT(ADDR(.notes) - LOAD_OFFSET) { \
  560. VMLINUX_SYMBOL(__start_notes) = .; \
  561. *(.note.*) \
  562. VMLINUX_SYMBOL(__stop_notes) = .; \
  563. }
  564. #define INIT_SETUP(initsetup_align) \
  565. . = ALIGN(initsetup_align); \
  566. VMLINUX_SYMBOL(__setup_start) = .; \
  567. *(.init.setup) \
  568. VMLINUX_SYMBOL(__setup_end) = .;
  569. #define INITCALLS \
  570. *(.initcallearly.init) \
  571. VMLINUX_SYMBOL(__early_initcall_end) = .; \
  572. *(.initcall0.init) \
  573. *(.initcall0s.init) \
  574. *(.initcall1.init) \
  575. *(.initcall1s.init) \
  576. *(.initcall2.init) \
  577. *(.initcall2s.init) \
  578. *(.initcall3.init) \
  579. *(.initcall3s.init) \
  580. *(.initcall4.init) \
  581. *(.initcall4s.init) \
  582. *(.initcall5.init) \
  583. *(.initcall5s.init) \
  584. *(.initcallrootfs.init) \
  585. *(.initcall6.init) \
  586. *(.initcall6s.init) \
  587. *(.initcall7.init) \
  588. *(.initcall7s.init)
  589. #define INIT_CALLS \
  590. VMLINUX_SYMBOL(__initcall_start) = .; \
  591. INITCALLS \
  592. VMLINUX_SYMBOL(__initcall_end) = .;
  593. #define CON_INITCALL \
  594. VMLINUX_SYMBOL(__con_initcall_start) = .; \
  595. *(.con_initcall.init) \
  596. VMLINUX_SYMBOL(__con_initcall_end) = .;
  597. #define SECURITY_INITCALL \
  598. VMLINUX_SYMBOL(__security_initcall_start) = .; \
  599. *(.security_initcall.init) \
  600. VMLINUX_SYMBOL(__security_initcall_end) = .;
  601. #ifdef CONFIG_BLK_DEV_INITRD
  602. #define INIT_RAM_FS \
  603. . = ALIGN(4); \
  604. VMLINUX_SYMBOL(__initramfs_start) = .; \
  605. *(.init.ramfs) \
  606. . = ALIGN(8); \
  607. *(.init.ramfs.info)
  608. #else
  609. #define INIT_RAM_FS
  610. #endif
  611. /*
  612. * Default discarded sections.
  613. *
  614. * Some archs want to discard exit text/data at runtime rather than
  615. * link time due to cross-section references such as alt instructions,
  616. * bug table, eh_frame, etc. DISCARDS must be the last of output
  617. * section definitions so that such archs put those in earlier section
  618. * definitions.
  619. */
  620. #define DISCARDS \
  621. /DISCARD/ : { \
  622. EXIT_TEXT \
  623. EXIT_DATA \
  624. EXIT_CALL \
  625. *(.discard) \
  626. *(.discard.*) \
  627. }
  628. /**
  629. * PERCPU_VADDR - define output section for percpu area
  630. * @cacheline: cacheline size
  631. * @vaddr: explicit base address (optional)
  632. * @phdr: destination PHDR (optional)
  633. *
  634. * Macro which expands to output section for percpu area.
  635. *
  636. * @cacheline is used to align subsections to avoid false cacheline
  637. * sharing between subsections for different purposes.
  638. *
  639. * If @vaddr is not blank, it specifies explicit base address and all
  640. * percpu symbols will be offset from the given address. If blank,
  641. * @vaddr always equals @laddr + LOAD_OFFSET.
  642. *
  643. * @phdr defines the output PHDR to use if not blank. Be warned that
  644. * output PHDR is sticky. If @phdr is specified, the next output
  645. * section in the linker script will go there too. @phdr should have
  646. * a leading colon.
  647. *
  648. * Note that this macros defines __per_cpu_load as an absolute symbol.
  649. * If there is no need to put the percpu section at a predetermined
  650. * address, use PERCPU().
  651. */
  652. #define PERCPU_VADDR(cacheline, vaddr, phdr) \
  653. VMLINUX_SYMBOL(__per_cpu_load) = .; \
  654. .data..percpu vaddr : AT(VMLINUX_SYMBOL(__per_cpu_load) \
  655. - LOAD_OFFSET) { \
  656. VMLINUX_SYMBOL(__per_cpu_start) = .; \
  657. *(.data..percpu..first) \
  658. . = ALIGN(PAGE_SIZE); \
  659. *(.data..percpu..page_aligned) \
  660. . = ALIGN(cacheline); \
  661. *(.data..percpu..readmostly) \
  662. . = ALIGN(cacheline); \
  663. *(.data..percpu) \
  664. *(.data..percpu..shared_aligned) \
  665. VMLINUX_SYMBOL(__per_cpu_end) = .; \
  666. } phdr \
  667. . = VMLINUX_SYMBOL(__per_cpu_load) + SIZEOF(.data..percpu);
  668. /**
  669. * PERCPU - define output section for percpu area, simple version
  670. * @cacheline: cacheline size
  671. * @align: required alignment
  672. *
  673. * Align to @align and outputs output section for percpu area. This macro
  674. * doesn't manipulate @vaddr or @phdr and __per_cpu_load and
  675. * __per_cpu_start will be identical.
  676. *
  677. * This macro is equivalent to ALIGN(@align); PERCPU_VADDR(@cacheline,,)
  678. * except that __per_cpu_load is defined as a relative symbol against
  679. * .data..percpu which is required for relocatable x86_32 configuration.
  680. */
  681. #define PERCPU(cacheline, align) \
  682. . = ALIGN(align); \
  683. .data..percpu : AT(ADDR(.data..percpu) - LOAD_OFFSET) { \
  684. VMLINUX_SYMBOL(__per_cpu_load) = .; \
  685. VMLINUX_SYMBOL(__per_cpu_start) = .; \
  686. *(.data..percpu..first) \
  687. . = ALIGN(PAGE_SIZE); \
  688. *(.data..percpu..page_aligned) \
  689. . = ALIGN(cacheline); \
  690. *(.data..percpu..readmostly) \
  691. . = ALIGN(cacheline); \
  692. *(.data..percpu) \
  693. *(.data..percpu..shared_aligned) \
  694. VMLINUX_SYMBOL(__per_cpu_end) = .; \
  695. }
  696. /*
  697. * Definition of the high level *_SECTION macros
  698. * They will fit only a subset of the architectures
  699. */
  700. /*
  701. * Writeable data.
  702. * All sections are combined in a single .data section.
  703. * The sections following CONSTRUCTORS are arranged so their
  704. * typical alignment matches.
  705. * A cacheline is typical/always less than a PAGE_SIZE so
  706. * the sections that has this restriction (or similar)
  707. * is located before the ones requiring PAGE_SIZE alignment.
  708. * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which
  709. * matches the requirment of PAGE_ALIGNED_DATA.
  710. *
  711. * use 0 as page_align if page_aligned data is not used */
  712. #define RW_DATA_SECTION(cacheline, pagealigned, inittask) \
  713. . = ALIGN(PAGE_SIZE); \
  714. .data : AT(ADDR(.data) - LOAD_OFFSET) { \
  715. INIT_TASK_DATA(inittask) \
  716. NOSAVE_DATA \
  717. PAGE_ALIGNED_DATA(pagealigned) \
  718. CACHELINE_ALIGNED_DATA(cacheline) \
  719. READ_MOSTLY_DATA(cacheline) \
  720. DATA_DATA \
  721. CONSTRUCTORS \
  722. }
  723. #define INIT_TEXT_SECTION(inittext_align) \
  724. . = ALIGN(inittext_align); \
  725. .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) { \
  726. VMLINUX_SYMBOL(_sinittext) = .; \
  727. INIT_TEXT \
  728. VMLINUX_SYMBOL(_einittext) = .; \
  729. }
  730. #define INIT_DATA_SECTION(initsetup_align) \
  731. .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) { \
  732. INIT_DATA \
  733. INIT_SETUP(initsetup_align) \
  734. INIT_CALLS \
  735. CON_INITCALL \
  736. SECURITY_INITCALL \
  737. INIT_RAM_FS \
  738. }
  739. #define BSS_SECTION(sbss_align, bss_align, stop_align) \
  740. . = ALIGN(sbss_align); \
  741. VMLINUX_SYMBOL(__bss_start) = .; \
  742. SBSS(sbss_align) \
  743. BSS(bss_align) \
  744. . = ALIGN(stop_align); \
  745. VMLINUX_SYMBOL(__bss_stop) = .;