| blob | db22d136ad08bf671266faa87f89de37178187f3 |
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_SECTION(CACHELINE_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 */
51 #ifndef LOAD_OFFSET
52 #define LOAD_OFFSET 0
53 #endif
55 #ifndef SYMBOL_PREFIX
56 #define VMLINUX_SYMBOL(sym) sym
57 #else
58 #define PASTE2(x,y) x##y
59 #define PASTE(x,y) PASTE2(x,y)
60 #define VMLINUX_SYMBOL(sym) PASTE(SYMBOL_PREFIX, sym)
61 #endif
63 /* Align . to a 8 byte boundary equals to maximum function alignment. */
64 #define ALIGN_FUNCTION() . = ALIGN(8)
66 /*
67 * Align to a 32 byte boundary equal to the
68 * alignment gcc 4.5 uses for a struct
69 */
70 #define STRUCT_ALIGNMENT 32
71 #define STRUCT_ALIGN() . = ALIGN(STRUCT_ALIGNMENT)
73 /* The actual configuration determine if the init/exit sections
74 * are handled as text/data or they can be discarded (which
75 * often happens at runtime)
76 */
77 #ifdef CONFIG_HOTPLUG
78 #define DEV_KEEP(sec) *(.dev##sec)
79 #define DEV_DISCARD(sec)
80 #else
81 #define DEV_KEEP(sec)
82 #define DEV_DISCARD(sec) *(.dev##sec)
83 #endif
85 #ifdef CONFIG_HOTPLUG_CPU
86 #define CPU_KEEP(sec) *(.cpu##sec)
87 #define CPU_DISCARD(sec)
88 #else
89 #define CPU_KEEP(sec)
90 #define CPU_DISCARD(sec) *(.cpu##sec)
91 #endif
93 #if defined(CONFIG_MEMORY_HOTPLUG)
94 #define MEM_KEEP(sec) *(.mem##sec)
95 #define MEM_DISCARD(sec)
96 #else
97 #define MEM_KEEP(sec)
98 #define MEM_DISCARD(sec) *(.mem##sec)
99 #endif
101 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
102 #define MCOUNT_REC() . = ALIGN(8); \
103 VMLINUX_SYMBOL(__start_mcount_loc) = .; \
104 *(__mcount_loc) \
105 VMLINUX_SYMBOL(__stop_mcount_loc) = .;
106 #else
107 #define MCOUNT_REC()
108 #endif
110 #ifdef CONFIG_TRACE_BRANCH_PROFILING
111 #define LIKELY_PROFILE() VMLINUX_SYMBOL(__start_annotated_branch_profile) = .; \
112 *(_ftrace_annotated_branch) \
113 VMLINUX_SYMBOL(__stop_annotated_branch_profile) = .;
114 #else
115 #define LIKELY_PROFILE()
116 #endif
118 #ifdef CONFIG_PROFILE_ALL_BRANCHES
119 #define BRANCH_PROFILE() VMLINUX_SYMBOL(__start_branch_profile) = .; \
120 *(_ftrace_branch) \
121 VMLINUX_SYMBOL(__stop_branch_profile) = .;
122 #else
123 #define BRANCH_PROFILE()
124 #endif
126 #ifdef CONFIG_EVENT_TRACING
127 #define FTRACE_EVENTS() . = ALIGN(8); \
128 VMLINUX_SYMBOL(__start_ftrace_events) = .; \
129 *(_ftrace_events) \
130 VMLINUX_SYMBOL(__stop_ftrace_events) = .;
131 #else
132 #define FTRACE_EVENTS()
133 #endif
135 #ifdef CONFIG_TRACING
136 #define TRACE_PRINTKS() VMLINUX_SYMBOL(__start___trace_bprintk_fmt) = .; \
138 VMLINUX_SYMBOL(__stop___trace_bprintk_fmt) = .;
139 #else
140 #define TRACE_PRINTKS()
141 #endif
143 #ifdef CONFIG_FTRACE_SYSCALLS
144 #define TRACE_SYSCALLS() . = ALIGN(8); \
145 VMLINUX_SYMBOL(__start_syscalls_metadata) = .; \
146 *(__syscalls_metadata) \
147 VMLINUX_SYMBOL(__stop_syscalls_metadata) = .;
148 #else
149 #define TRACE_SYSCALLS()
150 #endif
153 #define KERNEL_DTB() \
154 STRUCT_ALIGN(); \
155 VMLINUX_SYMBOL(__dtb_start) = .; \
156 *(.dtb.init.rodata) \
157 VMLINUX_SYMBOL(__dtb_end) = .;
159 /* .data section */
160 #define DATA_DATA \
161 *(.data) \
162 *(.ref.data) \
164 DEV_KEEP(init.data) \
165 DEV_KEEP(exit.data) \
166 CPU_KEEP(init.data) \
167 CPU_KEEP(exit.data) \
168 MEM_KEEP(init.data) \
169 MEM_KEEP(exit.data) \
170 STRUCT_ALIGN(); \
171 *(__tracepoints) \
173 . = ALIGN(8); \
174 VMLINUX_SYMBOL(__start___jump_table) = .; \
175 *(__jump_table) \
176 VMLINUX_SYMBOL(__stop___jump_table) = .; \
177 . = ALIGN(8); \
178 VMLINUX_SYMBOL(__start___verbose) = .; \
179 *(__verbose) \
180 VMLINUX_SYMBOL(__stop___verbose) = .; \
181 LIKELY_PROFILE() \
182 BRANCH_PROFILE() \
183 TRACE_PRINTKS()
185 /*
186 * Data section helpers
187 */
188 #define NOSAVE_DATA \
189 . = ALIGN(PAGE_SIZE); \
190 VMLINUX_SYMBOL(__nosave_begin) = .; \
191 *(.data..nosave) \
192 . = ALIGN(PAGE_SIZE); \
193 VMLINUX_SYMBOL(__nosave_end) = .;
195 #define PAGE_ALIGNED_DATA(page_align) \
196 . = ALIGN(page_align); \
197 *(.data..page_aligned)
199 #define READ_MOSTLY_DATA(align) \
200 . = ALIGN(align); \
201 *(.data..read_mostly) \
202 . = ALIGN(align);
204 #define CACHELINE_ALIGNED_DATA(align) \
205 . = ALIGN(align); \
206 *(.data..cacheline_aligned)
208 #define INIT_TASK_DATA(align) \
209 . = ALIGN(align); \
210 *(.data..init_task)
212 /*
213 * Read only Data
214 */
215 #define RO_DATA_SECTION(align) \
216 . = ALIGN((align)); \
217 .rodata : AT(ADDR(.rodata) - LOAD_OFFSET) { \
218 VMLINUX_SYMBOL(__start_rodata) = .; \
219 *(.rodata) *(.rodata.*) \
221 . = ALIGN(8); \
222 VMLINUX_SYMBOL(__start___tracepoints_ptrs) = .; \
224 VMLINUX_SYMBOL(__stop___tracepoints_ptrs) = .; \
227 } \
228 \
229 .rodata1 : AT(ADDR(.rodata1) - LOAD_OFFSET) { \
230 *(.rodata1) \
231 } \
232 \
233 BUG_TABLE \
234 \
236 .pci_fixup : AT(ADDR(.pci_fixup) - LOAD_OFFSET) { \
237 VMLINUX_SYMBOL(__start_pci_fixups_early) = .; \
238 *(.pci_fixup_early) \
239 VMLINUX_SYMBOL(__end_pci_fixups_early) = .; \
240 VMLINUX_SYMBOL(__start_pci_fixups_header) = .; \
241 *(.pci_fixup_header) \
242 VMLINUX_SYMBOL(__end_pci_fixups_header) = .; \
243 VMLINUX_SYMBOL(__start_pci_fixups_final) = .; \
244 *(.pci_fixup_final) \
245 VMLINUX_SYMBOL(__end_pci_fixups_final) = .; \
246 VMLINUX_SYMBOL(__start_pci_fixups_enable) = .; \
247 *(.pci_fixup_enable) \
248 VMLINUX_SYMBOL(__end_pci_fixups_enable) = .; \
249 VMLINUX_SYMBOL(__start_pci_fixups_resume) = .; \
250 *(.pci_fixup_resume) \
251 VMLINUX_SYMBOL(__end_pci_fixups_resume) = .; \
252 VMLINUX_SYMBOL(__start_pci_fixups_resume_early) = .; \
253 *(.pci_fixup_resume_early) \
254 VMLINUX_SYMBOL(__end_pci_fixups_resume_early) = .; \
255 VMLINUX_SYMBOL(__start_pci_fixups_suspend) = .; \
256 *(.pci_fixup_suspend) \
257 VMLINUX_SYMBOL(__end_pci_fixups_suspend) = .; \
258 } \
259 \
261 .builtin_fw : AT(ADDR(.builtin_fw) - LOAD_OFFSET) { \
262 VMLINUX_SYMBOL(__start_builtin_fw) = .; \
263 *(.builtin_fw) \
264 VMLINUX_SYMBOL(__end_builtin_fw) = .; \
265 } \
266 \
268 .rio_ops : AT(ADDR(.rio_ops) - LOAD_OFFSET) { \
269 VMLINUX_SYMBOL(__start_rio_switch_ops) = .; \
270 *(.rio_switch_ops) \
271 VMLINUX_SYMBOL(__end_rio_switch_ops) = .; \
272 } \
273 \
274 TRACEDATA \
275 \
277 __ksymtab : AT(ADDR(__ksymtab) - LOAD_OFFSET) { \
278 VMLINUX_SYMBOL(__start___ksymtab) = .; \
279 *(SORT(___ksymtab+*)) \
280 VMLINUX_SYMBOL(__stop___ksymtab) = .; \
281 } \
282 \
284 __ksymtab_gpl : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) { \
285 VMLINUX_SYMBOL(__start___ksymtab_gpl) = .; \
286 *(SORT(___ksymtab_gpl+*)) \
287 VMLINUX_SYMBOL(__stop___ksymtab_gpl) = .; \
288 } \
289 \
291 __ksymtab_unused : AT(ADDR(__ksymtab_unused) - LOAD_OFFSET) { \
292 VMLINUX_SYMBOL(__start___ksymtab_unused) = .; \
293 *(SORT(___ksymtab_unused+*)) \
294 VMLINUX_SYMBOL(__stop___ksymtab_unused) = .; \
295 } \
296 \
298 __ksymtab_unused_gpl : AT(ADDR(__ksymtab_unused_gpl) - LOAD_OFFSET) { \
299 VMLINUX_SYMBOL(__start___ksymtab_unused_gpl) = .; \
300 *(SORT(___ksymtab_unused_gpl+*)) \
301 VMLINUX_SYMBOL(__stop___ksymtab_unused_gpl) = .; \
302 } \
303 \
305 __ksymtab_gpl_future : AT(ADDR(__ksymtab_gpl_future) - LOAD_OFFSET) { \
306 VMLINUX_SYMBOL(__start___ksymtab_gpl_future) = .; \
307 *(SORT(___ksymtab_gpl_future+*)) \
308 VMLINUX_SYMBOL(__stop___ksymtab_gpl_future) = .; \
309 } \
310 \
312 __kcrctab : AT(ADDR(__kcrctab) - LOAD_OFFSET) { \
313 VMLINUX_SYMBOL(__start___kcrctab) = .; \
314 *(SORT(___kcrctab+*)) \
315 VMLINUX_SYMBOL(__stop___kcrctab) = .; \
316 } \
317 \
319 __kcrctab_gpl : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) { \
320 VMLINUX_SYMBOL(__start___kcrctab_gpl) = .; \
321 *(SORT(___kcrctab_gpl+*)) \
322 VMLINUX_SYMBOL(__stop___kcrctab_gpl) = .; \
323 } \
324 \
326 __kcrctab_unused : AT(ADDR(__kcrctab_unused) - LOAD_OFFSET) { \
327 VMLINUX_SYMBOL(__start___kcrctab_unused) = .; \
328 *(SORT(___kcrctab_unused+*)) \
329 VMLINUX_SYMBOL(__stop___kcrctab_unused) = .; \
330 } \
331 \
333 __kcrctab_unused_gpl : AT(ADDR(__kcrctab_unused_gpl) - LOAD_OFFSET) { \
334 VMLINUX_SYMBOL(__start___kcrctab_unused_gpl) = .; \
335 *(SORT(___kcrctab_unused_gpl+*)) \
336 VMLINUX_SYMBOL(__stop___kcrctab_unused_gpl) = .; \
337 } \
338 \
340 __kcrctab_gpl_future : AT(ADDR(__kcrctab_gpl_future) - LOAD_OFFSET) { \
341 VMLINUX_SYMBOL(__start___kcrctab_gpl_future) = .; \
342 *(SORT(___kcrctab_gpl_future+*)) \
343 VMLINUX_SYMBOL(__stop___kcrctab_gpl_future) = .; \
344 } \
345 \
347 __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \
348 *(__ksymtab_strings) \
349 } \
350 \
352 __init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) { \
353 *(.ref.rodata) \
354 DEV_KEEP(init.rodata) \
355 DEV_KEEP(exit.rodata) \
356 CPU_KEEP(init.rodata) \
357 CPU_KEEP(exit.rodata) \
358 MEM_KEEP(init.rodata) \
359 MEM_KEEP(exit.rodata) \
360 } \
361 \
363 __param : AT(ADDR(__param) - LOAD_OFFSET) { \
364 VMLINUX_SYMBOL(__start___param) = .; \
365 *(__param) \
366 VMLINUX_SYMBOL(__stop___param) = .; \
367 } \
368 \
370 __modver : AT(ADDR(__modver) - LOAD_OFFSET) { \
371 VMLINUX_SYMBOL(__start___modver) = .; \
372 *(__modver) \
373 VMLINUX_SYMBOL(__stop___modver) = .; \
374 . = ALIGN((align)); \
375 VMLINUX_SYMBOL(__end_rodata) = .; \
376 } \
377 . = ALIGN((align));
379 /* RODATA & RO_DATA provided for backward compatibility.
380 * All archs are supposed to use RO_DATA() */
381 #define RODATA RO_DATA_SECTION(4096)
382 #define RO_DATA(align) RO_DATA_SECTION(align)
384 #define SECURITY_INIT \
385 .security_initcall.init : AT(ADDR(.security_initcall.init) - LOAD_OFFSET) { \
386 VMLINUX_SYMBOL(__security_initcall_start) = .; \
387 *(.security_initcall.init) \
388 VMLINUX_SYMBOL(__security_initcall_end) = .; \
389 }
391 /* .text section. Map to function alignment to avoid address changes
392 * during second ld run in second ld pass when generating System.map */
393 #define TEXT_TEXT \
394 ALIGN_FUNCTION(); \
395 *(.text.hot) \
396 *(.text) \
397 *(.ref.text) \
398 DEV_KEEP(init.text) \
399 DEV_KEEP(exit.text) \
400 CPU_KEEP(init.text) \
401 CPU_KEEP(exit.text) \
402 MEM_KEEP(init.text) \
403 MEM_KEEP(exit.text) \
404 *(.text.unlikely)
407 /* sched.text is aling to function alignment to secure we have same
408 * address even at second ld pass when generating System.map */
409 #define SCHED_TEXT \
410 ALIGN_FUNCTION(); \
411 VMLINUX_SYMBOL(__sched_text_start) = .; \
412 *(.sched.text) \
413 VMLINUX_SYMBOL(__sched_text_end) = .;
415 /* spinlock.text is aling to function alignment to secure we have same
416 * address even at second ld pass when generating System.map */
417 #define LOCK_TEXT \
418 ALIGN_FUNCTION(); \
419 VMLINUX_SYMBOL(__lock_text_start) = .; \
420 *(.spinlock.text) \
421 VMLINUX_SYMBOL(__lock_text_end) = .;
423 #define KPROBES_TEXT \
424 ALIGN_FUNCTION(); \
425 VMLINUX_SYMBOL(__kprobes_text_start) = .; \
426 *(.kprobes.text) \
427 VMLINUX_SYMBOL(__kprobes_text_end) = .;
429 #define ENTRY_TEXT \
430 ALIGN_FUNCTION(); \
431 VMLINUX_SYMBOL(__entry_text_start) = .; \
432 *(.entry.text) \
433 VMLINUX_SYMBOL(__entry_text_end) = .;
435 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
436 #define IRQENTRY_TEXT \
437 ALIGN_FUNCTION(); \
438 VMLINUX_SYMBOL(__irqentry_text_start) = .; \
439 *(.irqentry.text) \
440 VMLINUX_SYMBOL(__irqentry_text_end) = .;
441 #else
442 #define IRQENTRY_TEXT
443 #endif
445 /* Section used for early init (in .S files) */
446 #define HEAD_TEXT *(.head.text)
448 #define HEAD_TEXT_SECTION \
449 .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) { \
450 HEAD_TEXT \
451 }
453 /*
454 * Exception table
455 */
456 #define EXCEPTION_TABLE(align) \
457 . = ALIGN(align); \
458 __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) { \
459 VMLINUX_SYMBOL(__start___ex_table) = .; \
460 *(__ex_table) \
461 VMLINUX_SYMBOL(__stop___ex_table) = .; \
462 }
464 /*
465 * Init task
466 */
467 #define INIT_TASK_DATA_SECTION(align) \
468 . = ALIGN(align); \
469 .data..init_task : AT(ADDR(.data..init_task) - LOAD_OFFSET) { \
470 INIT_TASK_DATA(align) \
471 }
473 #ifdef CONFIG_CONSTRUCTORS
474 #define KERNEL_CTORS() . = ALIGN(8); \
475 VMLINUX_SYMBOL(__ctors_start) = .; \
476 *(.ctors) \
477 VMLINUX_SYMBOL(__ctors_end) = .;
478 #else
479 #define KERNEL_CTORS()
480 #endif
482 /* init and exit section handling */
483 #define INIT_DATA \
484 *(.init.data) \
485 DEV_DISCARD(init.data) \
486 CPU_DISCARD(init.data) \
487 MEM_DISCARD(init.data) \
488 KERNEL_CTORS() \
489 *(.init.rodata) \
490 MCOUNT_REC() \
491 FTRACE_EVENTS() \
492 TRACE_SYSCALLS() \
493 DEV_DISCARD(init.rodata) \
494 CPU_DISCARD(init.rodata) \
495 MEM_DISCARD(init.rodata) \
496 KERNEL_DTB()
498 #define INIT_TEXT \
499 *(.init.text) \
500 DEV_DISCARD(init.text) \
501 CPU_DISCARD(init.text) \
502 MEM_DISCARD(init.text)
504 #define EXIT_DATA \
505 *(.exit.data) \
506 DEV_DISCARD(exit.data) \
507 DEV_DISCARD(exit.rodata) \
508 CPU_DISCARD(exit.data) \
509 CPU_DISCARD(exit.rodata) \
510 MEM_DISCARD(exit.data) \
511 MEM_DISCARD(exit.rodata)
513 #define EXIT_TEXT \
514 *(.exit.text) \
515 DEV_DISCARD(exit.text) \
516 CPU_DISCARD(exit.text) \
517 MEM_DISCARD(exit.text)
519 #define EXIT_CALL \
520 *(.exitcall.exit)
522 /*
523 * bss (Block Started by Symbol) - uninitialized data
524 * zeroed during startup
525 */
526 #define SBSS(sbss_align) \
527 . = ALIGN(sbss_align); \
528 .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) { \
529 *(.sbss) \
530 *(.scommon) \
531 }
533 #define BSS(bss_align) \
534 . = ALIGN(bss_align); \
535 .bss : AT(ADDR(.bss) - LOAD_OFFSET) { \
536 *(.bss..page_aligned) \
537 *(.dynbss) \
538 *(.bss) \
539 *(COMMON) \
540 }
542 /*
543 * DWARF debug sections.
544 * Symbols in the DWARF debugging sections are relative to
545 * the beginning of the section so we begin them at 0.
546 */
547 #define DWARF_DEBUG \
549 .debug 0 : { *(.debug) } \
550 .line 0 : { *(.line) } \
552 .debug_srcinfo 0 : { *(.debug_srcinfo) } \
553 .debug_sfnames 0 : { *(.debug_sfnames) } \
555 .debug_aranges 0 : { *(.debug_aranges) } \
556 .debug_pubnames 0 : { *(.debug_pubnames) } \
558 .debug_info 0 : { *(.debug_info \
559 .gnu.linkonce.wi.*) } \
560 .debug_abbrev 0 : { *(.debug_abbrev) } \
561 .debug_line 0 : { *(.debug_line) } \
562 .debug_frame 0 : { *(.debug_frame) } \
563 .debug_str 0 : { *(.debug_str) } \
564 .debug_loc 0 : { *(.debug_loc) } \
565 .debug_macinfo 0 : { *(.debug_macinfo) } \
567 .debug_weaknames 0 : { *(.debug_weaknames) } \
568 .debug_funcnames 0 : { *(.debug_funcnames) } \
569 .debug_typenames 0 : { *(.debug_typenames) } \
570 .debug_varnames 0 : { *(.debug_varnames) } \
572 /* Stabs debugging sections. */
573 #define STABS_DEBUG \
574 .stab 0 : { *(.stab) } \
575 .stabstr 0 : { *(.stabstr) } \
576 .stab.excl 0 : { *(.stab.excl) } \
577 .stab.exclstr 0 : { *(.stab.exclstr) } \
578 .stab.index 0 : { *(.stab.index) } \
579 .stab.indexstr 0 : { *(.stab.indexstr) } \
580 .comment 0 : { *(.comment) }
582 #ifdef CONFIG_GENERIC_BUG
583 #define BUG_TABLE \
584 . = ALIGN(8); \
585 __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) { \
586 VMLINUX_SYMBOL(__start___bug_table) = .; \
587 *(__bug_table) \
588 VMLINUX_SYMBOL(__stop___bug_table) = .; \
589 }
590 #else
591 #define BUG_TABLE
592 #endif
594 #ifdef CONFIG_PM_TRACE
595 #define TRACEDATA \
596 . = ALIGN(4); \
597 .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) { \
598 VMLINUX_SYMBOL(__tracedata_start) = .; \
599 *(.tracedata) \
600 VMLINUX_SYMBOL(__tracedata_end) = .; \
601 }
602 #else
603 #define TRACEDATA
604 #endif
606 #define NOTES \
607 .notes : AT(ADDR(.notes) - LOAD_OFFSET) { \
608 VMLINUX_SYMBOL(__start_notes) = .; \
609 *(.note.*) \
610 VMLINUX_SYMBOL(__stop_notes) = .; \
611 }
613 #define INIT_SETUP(initsetup_align) \
614 . = ALIGN(initsetup_align); \
615 VMLINUX_SYMBOL(__setup_start) = .; \
616 *(.init.setup) \
617 VMLINUX_SYMBOL(__setup_end) = .;
619 #define INITCALLS \
620 *(.initcallearly.init) \
621 VMLINUX_SYMBOL(__early_initcall_end) = .; \
622 *(.initcall0.init) \
623 *(.initcall0s.init) \
624 *(.initcall1.init) \
625 *(.initcall1s.init) \
626 *(.initcall2.init) \
627 *(.initcall2s.init) \
628 *(.initcall3.init) \
629 *(.initcall3s.init) \
630 *(.initcall4.init) \
631 *(.initcall4s.init) \
632 *(.initcall5.init) \
633 *(.initcall5s.init) \
634 *(.initcallrootfs.init) \
635 *(.initcall6.init) \
636 *(.initcall6s.init) \
637 *(.initcall7.init) \
638 *(.initcall7s.init)
640 #define INIT_CALLS \
641 VMLINUX_SYMBOL(__initcall_start) = .; \
642 INITCALLS \
643 VMLINUX_SYMBOL(__initcall_end) = .;
645 #define CON_INITCALL \
646 VMLINUX_SYMBOL(__con_initcall_start) = .; \
647 *(.con_initcall.init) \
648 VMLINUX_SYMBOL(__con_initcall_end) = .;
650 #define SECURITY_INITCALL \
651 VMLINUX_SYMBOL(__security_initcall_start) = .; \
652 *(.security_initcall.init) \
653 VMLINUX_SYMBOL(__security_initcall_end) = .;
655 #ifdef CONFIG_BLK_DEV_INITRD
656 #define INIT_RAM_FS \
657 . = ALIGN(4); \
658 VMLINUX_SYMBOL(__initramfs_start) = .; \
659 *(.init.ramfs) \
660 . = ALIGN(8); \
661 *(.init.ramfs.info)
662 #else
663 #define INIT_RAM_FS
664 #endif
666 /*
667 * Default discarded sections.
668 *
669 * Some archs want to discard exit text/data at runtime rather than
670 * link time due to cross-section references such as alt instructions,
671 * bug table, eh_frame, etc. DISCARDS must be the last of output
672 * section definitions so that such archs put those in earlier section
673 * definitions.
674 */
675 #define DISCARDS \
676 /DISCARD/ : { \
677 EXIT_TEXT \
678 EXIT_DATA \
679 EXIT_CALL \
680 *(.discard) \
681 *(.discard.*) \
682 }
684 /**
685 * PERCPU_INPUT - the percpu input sections
686 * @cacheline: cacheline size
687 *
688 * The core percpu section names and core symbols which do not rely
689 * directly upon load addresses.
690 *
691 * @cacheline is used to align subsections to avoid false cacheline
692 * sharing between subsections for different purposes.
693 */
694 #define PERCPU_INPUT(cacheline) \
695 VMLINUX_SYMBOL(__per_cpu_start) = .; \
696 *(.data..percpu..first) \
697 . = ALIGN(PAGE_SIZE); \
698 *(.data..percpu..page_aligned) \
699 . = ALIGN(cacheline); \
700 *(.data..percpu..readmostly) \
701 . = ALIGN(cacheline); \
702 *(.data..percpu) \
703 *(.data..percpu..shared_aligned) \
704 VMLINUX_SYMBOL(__per_cpu_end) = .;
706 /**
707 * PERCPU_VADDR - define output section for percpu area
708 * @cacheline: cacheline size
709 * @vaddr: explicit base address (optional)
710 * @phdr: destination PHDR (optional)
711 *
712 * Macro which expands to output section for percpu area.
713 *
714 * @cacheline is used to align subsections to avoid false cacheline
715 * sharing between subsections for different purposes.
716 *
717 * If @vaddr is not blank, it specifies explicit base address and all
718 * percpu symbols will be offset from the given address. If blank,
719 * @vaddr always equals @laddr + LOAD_OFFSET.
720 *
721 * @phdr defines the output PHDR to use if not blank. Be warned that
722 * output PHDR is sticky. If @phdr is specified, the next output
723 * section in the linker script will go there too. @phdr should have
724 * a leading colon.
725 *
726 * Note that this macros defines __per_cpu_load as an absolute symbol.
727 * If there is no need to put the percpu section at a predetermined
728 * address, use PERCPU_SECTION.
729 */
730 #define PERCPU_VADDR(cacheline, vaddr, phdr) \
731 VMLINUX_SYMBOL(__per_cpu_load) = .; \
732 .data..percpu vaddr : AT(VMLINUX_SYMBOL(__per_cpu_load) \
733 - LOAD_OFFSET) { \
734 PERCPU_INPUT(cacheline) \
735 } phdr \
736 . = VMLINUX_SYMBOL(__per_cpu_load) + SIZEOF(.data..percpu);
738 /**
739 * PERCPU_SECTION - define output section for percpu area, simple version
740 * @cacheline: cacheline size
741 *
742 * Align to PAGE_SIZE and outputs output section for percpu area. This
743 * macro doesn't manipulate @vaddr or @phdr and __per_cpu_load and
744 * __per_cpu_start will be identical.
745 *
746 * This macro is equivalent to ALIGN(PAGE_SIZE); PERCPU_VADDR(@cacheline,,)
747 * except that __per_cpu_load is defined as a relative symbol against
748 * .data..percpu which is required for relocatable x86_32 configuration.
749 */
750 #define PERCPU_SECTION(cacheline) \
751 . = ALIGN(PAGE_SIZE); \
752 .data..percpu : AT(ADDR(.data..percpu) - LOAD_OFFSET) { \
753 VMLINUX_SYMBOL(__per_cpu_load) = .; \
754 PERCPU_INPUT(cacheline) \
755 }
758 /*
759 * Definition of the high level *_SECTION macros
760 * They will fit only a subset of the architectures
761 */
764 /*
765 * Writeable data.
766 * All sections are combined in a single .data section.
767 * The sections following CONSTRUCTORS are arranged so their
768 * typical alignment matches.
769 * A cacheline is typical/always less than a PAGE_SIZE so
770 * the sections that has this restriction (or similar)
771 * is located before the ones requiring PAGE_SIZE alignment.
772 * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which
773 * matches the requirement of PAGE_ALIGNED_DATA.
774 *
775 * use 0 as page_align if page_aligned data is not used */
776 #define RW_DATA_SECTION(cacheline, pagealigned, inittask) \
777 . = ALIGN(PAGE_SIZE); \
778 .data : AT(ADDR(.data) - LOAD_OFFSET) { \
779 INIT_TASK_DATA(inittask) \
780 NOSAVE_DATA \
781 PAGE_ALIGNED_DATA(pagealigned) \
782 CACHELINE_ALIGNED_DATA(cacheline) \
783 READ_MOSTLY_DATA(cacheline) \
784 DATA_DATA \
785 CONSTRUCTORS \
786 }
788 #define INIT_TEXT_SECTION(inittext_align) \
789 . = ALIGN(inittext_align); \
790 .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) { \
791 VMLINUX_SYMBOL(_sinittext) = .; \
792 INIT_TEXT \
793 VMLINUX_SYMBOL(_einittext) = .; \
794 }
796 #define INIT_DATA_SECTION(initsetup_align) \
797 .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) { \
798 INIT_DATA \
799 INIT_SETUP(initsetup_align) \
800 INIT_CALLS \
801 CON_INITCALL \
802 SECURITY_INITCALL \
803 INIT_RAM_FS \
804 }
806 #define BSS_SECTION(sbss_align, bss_align, stop_align) \
807 . = ALIGN(sbss_align); \
808 VMLINUX_SYMBOL(__bss_start) = .; \
809 SBSS(sbss_align) \
810 BSS(bss_align) \
811 . = ALIGN(stop_align); \
812 VMLINUX_SYMBOL(__bss_stop) = .;