| blob | b6e818f4b24756a4a7eeb570260a9894490acb4c |
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(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 */
51 #ifndef LOAD_OFFSET
52 #define LOAD_OFFSET 0
53 #endif
55 #ifndef VMLINUX_SYMBOL
56 #define VMLINUX_SYMBOL(_sym_) _sym_
57 #endif
59 /* Align . to a 8 byte boundary equals to maximum function alignment. */
60 #define ALIGN_FUNCTION() . = ALIGN(8)
62 /* The actual configuration determine if the init/exit sections
63 * are handled as text/data or they can be discarded (which
64 * often happens at runtime)
65 */
66 #ifdef CONFIG_HOTPLUG
67 #define DEV_KEEP(sec) *(.dev##sec)
68 #define DEV_DISCARD(sec)
69 #else
70 #define DEV_KEEP(sec)
71 #define DEV_DISCARD(sec) *(.dev##sec)
72 #endif
74 #ifdef CONFIG_HOTPLUG_CPU
75 #define CPU_KEEP(sec) *(.cpu##sec)
76 #define CPU_DISCARD(sec)
77 #else
78 #define CPU_KEEP(sec)
79 #define CPU_DISCARD(sec) *(.cpu##sec)
80 #endif
82 #if defined(CONFIG_MEMORY_HOTPLUG)
83 #define MEM_KEEP(sec) *(.mem##sec)
84 #define MEM_DISCARD(sec)
85 #else
86 #define MEM_KEEP(sec)
87 #define MEM_DISCARD(sec) *(.mem##sec)
88 #endif
90 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
91 #define MCOUNT_REC() . = ALIGN(8); \
92 VMLINUX_SYMBOL(__start_mcount_loc) = .; \
93 *(__mcount_loc) \
94 VMLINUX_SYMBOL(__stop_mcount_loc) = .;
95 #else
96 #define MCOUNT_REC()
97 #endif
99 #ifdef CONFIG_TRACE_BRANCH_PROFILING
100 #define LIKELY_PROFILE() VMLINUX_SYMBOL(__start_annotated_branch_profile) = .; \
101 *(_ftrace_annotated_branch) \
102 VMLINUX_SYMBOL(__stop_annotated_branch_profile) = .;
103 #else
104 #define LIKELY_PROFILE()
105 #endif
107 #ifdef CONFIG_PROFILE_ALL_BRANCHES
108 #define BRANCH_PROFILE() VMLINUX_SYMBOL(__start_branch_profile) = .; \
109 *(_ftrace_branch) \
110 VMLINUX_SYMBOL(__stop_branch_profile) = .;
111 #else
112 #define BRANCH_PROFILE()
113 #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
123 #ifdef CONFIG_TRACING
124 #define TRACE_PRINTKS() VMLINUX_SYMBOL(__start___trace_bprintk_fmt) = .; \
126 VMLINUX_SYMBOL(__stop___trace_bprintk_fmt) = .;
127 #else
128 #define TRACE_PRINTKS()
129 #endif
131 #ifdef CONFIG_FTRACE_SYSCALLS
132 #define TRACE_SYSCALLS() VMLINUX_SYMBOL(__start_syscalls_metadata) = .; \
133 *(__syscalls_metadata) \
134 VMLINUX_SYMBOL(__stop_syscalls_metadata) = .;
135 #else
136 #define TRACE_SYSCALLS()
137 #endif
139 /* .data section */
140 #define DATA_DATA \
141 *(.data) \
142 *(.ref.data) \
143 DEV_KEEP(init.data) \
144 DEV_KEEP(exit.data) \
145 CPU_KEEP(init.data) \
146 CPU_KEEP(exit.data) \
147 MEM_KEEP(init.data) \
148 MEM_KEEP(exit.data) \
149 . = ALIGN(8); \
150 VMLINUX_SYMBOL(__start___markers) = .; \
151 *(__markers) \
152 VMLINUX_SYMBOL(__stop___markers) = .; \
153 . = ALIGN(32); \
154 VMLINUX_SYMBOL(__start___tracepoints) = .; \
155 *(__tracepoints) \
156 VMLINUX_SYMBOL(__stop___tracepoints) = .; \
158 . = ALIGN(8); \
159 VMLINUX_SYMBOL(__start___verbose) = .; \
160 *(__verbose) \
161 VMLINUX_SYMBOL(__stop___verbose) = .; \
162 LIKELY_PROFILE() \
163 BRANCH_PROFILE() \
164 TRACE_PRINTKS() \
165 FTRACE_EVENTS() \
166 TRACE_SYSCALLS()
168 /*
169 * Data section helpers
170 */
171 #define NOSAVE_DATA \
172 . = ALIGN(PAGE_SIZE); \
173 VMLINUX_SYMBOL(__nosave_begin) = .; \
174 *(.data.nosave) \
175 . = ALIGN(PAGE_SIZE); \
176 VMLINUX_SYMBOL(__nosave_end) = .;
178 #define PAGE_ALIGNED_DATA(page_align) \
179 . = ALIGN(page_align); \
180 *(.data.page_aligned)
182 #define READ_MOSTLY_DATA(align) \
183 . = ALIGN(align); \
184 *(.data.read_mostly)
186 #define CACHELINE_ALIGNED_DATA(align) \
187 . = ALIGN(align); \
188 *(.data.cacheline_aligned)
190 #define INIT_TASK_DATA(align) \
191 . = ALIGN(align); \
192 *(.data.init_task)
194 /*
195 * Read only Data
196 */
197 #define RO_DATA_SECTION(align) \
198 . = ALIGN((align)); \
199 .rodata : AT(ADDR(.rodata) - LOAD_OFFSET) { \
200 VMLINUX_SYMBOL(__start_rodata) = .; \
201 *(.rodata) *(.rodata.*) \
205 } \
206 \
207 .rodata1 : AT(ADDR(.rodata1) - LOAD_OFFSET) { \
208 *(.rodata1) \
209 } \
210 \
211 BUG_TABLE \
212 \
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 \
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 \
246 .rio_route : AT(ADDR(.rio_route) - LOAD_OFFSET) { \
247 VMLINUX_SYMBOL(__start_rio_route_ops) = .; \
248 *(.rio_route_ops) \
249 VMLINUX_SYMBOL(__end_rio_route_ops) = .; \
250 } \
251 \
252 TRACEDATA \
253 \
255 __ksymtab : AT(ADDR(__ksymtab) - LOAD_OFFSET) { \
256 VMLINUX_SYMBOL(__start___ksymtab) = .; \
257 *(__ksymtab) \
258 VMLINUX_SYMBOL(__stop___ksymtab) = .; \
259 } \
260 \
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 \
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 \
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 \
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 \
290 __kcrctab : AT(ADDR(__kcrctab) - LOAD_OFFSET) { \
291 VMLINUX_SYMBOL(__start___kcrctab) = .; \
292 *(__kcrctab) \
293 VMLINUX_SYMBOL(__stop___kcrctab) = .; \
294 } \
295 \
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 \
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 \
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 \
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 \
325 __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \
326 *(__ksymtab_strings) \
327 } \
328 \
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 \
341 __param : AT(ADDR(__param) - LOAD_OFFSET) { \
342 VMLINUX_SYMBOL(__start___param) = .; \
343 *(__param) \
344 VMLINUX_SYMBOL(__stop___param) = .; \
345 . = ALIGN((align)); \
346 VMLINUX_SYMBOL(__end_rodata) = .; \
347 } \
348 . = ALIGN((align));
350 /* RODATA & RO_DATA provided for backward compatibility.
351 * All archs are supposed to use RO_DATA() */
352 #define RODATA RO_DATA_SECTION(4096)
353 #define RO_DATA(align) RO_DATA_SECTION(align)
355 #define SECURITY_INIT \
356 .security_initcall.init : AT(ADDR(.security_initcall.init) - LOAD_OFFSET) { \
357 VMLINUX_SYMBOL(__security_initcall_start) = .; \
358 *(.security_initcall.init) \
359 VMLINUX_SYMBOL(__security_initcall_end) = .; \
360 }
362 /* .text section. Map to function alignment to avoid address changes
363 * during second ld run in second ld pass when generating System.map */
364 #define TEXT_TEXT \
365 ALIGN_FUNCTION(); \
366 *(.text.hot) \
367 *(.text) \
368 *(.ref.text) \
369 DEV_KEEP(init.text) \
370 DEV_KEEP(exit.text) \
371 CPU_KEEP(init.text) \
372 CPU_KEEP(exit.text) \
373 MEM_KEEP(init.text) \
374 MEM_KEEP(exit.text) \
375 *(.text.unlikely)
378 /* sched.text is aling to function alignment to secure we have same
379 * address even at second ld pass when generating System.map */
380 #define SCHED_TEXT \
381 ALIGN_FUNCTION(); \
382 VMLINUX_SYMBOL(__sched_text_start) = .; \
383 *(.sched.text) \
384 VMLINUX_SYMBOL(__sched_text_end) = .;
386 /* spinlock.text is aling to function alignment to secure we have same
387 * address even at second ld pass when generating System.map */
388 #define LOCK_TEXT \
389 ALIGN_FUNCTION(); \
390 VMLINUX_SYMBOL(__lock_text_start) = .; \
391 *(.spinlock.text) \
392 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) = .;
400 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
401 #define IRQENTRY_TEXT \
402 ALIGN_FUNCTION(); \
403 VMLINUX_SYMBOL(__irqentry_text_start) = .; \
404 *(.irqentry.text) \
405 VMLINUX_SYMBOL(__irqentry_text_end) = .;
406 #else
407 #define IRQENTRY_TEXT
408 #endif
410 /* Section used for early init (in .S files) */
411 #define HEAD_TEXT *(.head.text)
413 #define HEAD_TEXT_SECTION \
414 .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) { \
415 HEAD_TEXT \
416 }
418 /*
419 * Exception table
420 */
421 #define EXCEPTION_TABLE(align) \
422 . = ALIGN(align); \
423 __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) { \
424 VMLINUX_SYMBOL(__start___ex_table) = .; \
425 *(__ex_table) \
426 VMLINUX_SYMBOL(__stop___ex_table) = .; \
427 }
429 /*
430 * Init task
431 */
432 #define INIT_TASK_DATA_SECTION(align) \
433 . = ALIGN(align); \
434 .data.init_task : { \
435 INIT_TASK_DATA(align) \
436 }
438 #ifdef CONFIG_CONSTRUCTORS
439 #define KERNEL_CTORS() . = ALIGN(8); \
440 VMLINUX_SYMBOL(__ctors_start) = .; \
441 *(.ctors) \
442 VMLINUX_SYMBOL(__ctors_end) = .;
443 #else
444 #define KERNEL_CTORS()
445 #endif
447 /* init and exit section handling */
448 #define INIT_DATA \
449 *(.init.data) \
450 DEV_DISCARD(init.data) \
451 CPU_DISCARD(init.data) \
452 MEM_DISCARD(init.data) \
453 KERNEL_CTORS() \
454 *(.init.rodata) \
455 MCOUNT_REC() \
456 DEV_DISCARD(init.rodata) \
457 CPU_DISCARD(init.rodata) \
458 MEM_DISCARD(init.rodata)
460 #define INIT_TEXT \
461 *(.init.text) \
462 DEV_DISCARD(init.text) \
463 CPU_DISCARD(init.text) \
464 MEM_DISCARD(init.text)
466 #define EXIT_DATA \
467 *(.exit.data) \
468 DEV_DISCARD(exit.data) \
469 DEV_DISCARD(exit.rodata) \
470 CPU_DISCARD(exit.data) \
471 CPU_DISCARD(exit.rodata) \
472 MEM_DISCARD(exit.data) \
473 MEM_DISCARD(exit.rodata)
475 #define EXIT_TEXT \
476 *(.exit.text) \
477 DEV_DISCARD(exit.text) \
478 CPU_DISCARD(exit.text) \
479 MEM_DISCARD(exit.text)
481 #define EXIT_CALL \
482 *(.exitcall.exit)
484 /*
485 * bss (Block Started by Symbol) - uninitialized data
486 * zeroed during startup
487 */
488 #define SBSS(sbss_align) \
489 . = ALIGN(sbss_align); \
490 .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) { \
491 *(.sbss) \
492 *(.scommon) \
493 }
495 #define BSS(bss_align) \
496 . = ALIGN(bss_align); \
497 .bss : AT(ADDR(.bss) - LOAD_OFFSET) { \
498 *(.bss.page_aligned) \
499 *(.dynbss) \
500 *(.bss) \
501 *(COMMON) \
502 }
504 /*
505 * DWARF debug sections.
506 * Symbols in the DWARF debugging sections are relative to
507 * the beginning of the section so we begin them at 0.
508 */
509 #define DWARF_DEBUG \
511 .debug 0 : { *(.debug) } \
512 .line 0 : { *(.line) } \
514 .debug_srcinfo 0 : { *(.debug_srcinfo) } \
515 .debug_sfnames 0 : { *(.debug_sfnames) } \
517 .debug_aranges 0 : { *(.debug_aranges) } \
518 .debug_pubnames 0 : { *(.debug_pubnames) } \
520 .debug_info 0 : { *(.debug_info \
521 .gnu.linkonce.wi.*) } \
522 .debug_abbrev 0 : { *(.debug_abbrev) } \
523 .debug_line 0 : { *(.debug_line) } \
524 .debug_frame 0 : { *(.debug_frame) } \
525 .debug_str 0 : { *(.debug_str) } \
526 .debug_loc 0 : { *(.debug_loc) } \
527 .debug_macinfo 0 : { *(.debug_macinfo) } \
529 .debug_weaknames 0 : { *(.debug_weaknames) } \
530 .debug_funcnames 0 : { *(.debug_funcnames) } \
531 .debug_typenames 0 : { *(.debug_typenames) } \
532 .debug_varnames 0 : { *(.debug_varnames) } \
534 /* Stabs debugging sections. */
535 #define STABS_DEBUG \
536 .stab 0 : { *(.stab) } \
537 .stabstr 0 : { *(.stabstr) } \
538 .stab.excl 0 : { *(.stab.excl) } \
539 .stab.exclstr 0 : { *(.stab.exclstr) } \
540 .stab.index 0 : { *(.stab.index) } \
541 .stab.indexstr 0 : { *(.stab.indexstr) } \
542 .comment 0 : { *(.comment) }
544 #ifdef CONFIG_GENERIC_BUG
545 #define BUG_TABLE \
546 . = ALIGN(8); \
547 __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) { \
548 VMLINUX_SYMBOL(__start___bug_table) = .; \
549 *(__bug_table) \
550 VMLINUX_SYMBOL(__stop___bug_table) = .; \
551 }
552 #else
553 #define BUG_TABLE
554 #endif
556 #ifdef CONFIG_PM_TRACE
557 #define TRACEDATA \
558 . = ALIGN(4); \
559 .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) { \
560 VMLINUX_SYMBOL(__tracedata_start) = .; \
561 *(.tracedata) \
562 VMLINUX_SYMBOL(__tracedata_end) = .; \
563 }
564 #else
565 #define TRACEDATA
566 #endif
568 #define NOTES \
569 .notes : AT(ADDR(.notes) - LOAD_OFFSET) { \
570 VMLINUX_SYMBOL(__start_notes) = .; \
571 *(.note.*) \
572 VMLINUX_SYMBOL(__stop_notes) = .; \
573 }
575 #define INIT_SETUP(initsetup_align) \
576 . = ALIGN(initsetup_align); \
577 VMLINUX_SYMBOL(__setup_start) = .; \
578 *(.init.setup) \
579 VMLINUX_SYMBOL(__setup_end) = .;
581 #define INITCALLS \
582 *(.initcallearly.init) \
583 VMLINUX_SYMBOL(__early_initcall_end) = .; \
584 *(.initcall0.init) \
585 *(.initcall0s.init) \
586 *(.initcall1.init) \
587 *(.initcall1s.init) \
588 *(.initcall2.init) \
589 *(.initcall2s.init) \
590 *(.initcall3.init) \
591 *(.initcall3s.init) \
592 *(.initcall4.init) \
593 *(.initcall4s.init) \
594 *(.initcall5.init) \
595 *(.initcall5s.init) \
596 *(.initcallrootfs.init) \
597 *(.initcall6.init) \
598 *(.initcall6s.init) \
599 *(.initcall7.init) \
600 *(.initcall7s.init)
602 #define INIT_CALLS \
603 VMLINUX_SYMBOL(__initcall_start) = .; \
604 INITCALLS \
605 VMLINUX_SYMBOL(__initcall_end) = .;
607 #define CON_INITCALL \
608 VMLINUX_SYMBOL(__con_initcall_start) = .; \
609 *(.con_initcall.init) \
610 VMLINUX_SYMBOL(__con_initcall_end) = .;
612 #define SECURITY_INITCALL \
613 VMLINUX_SYMBOL(__security_initcall_start) = .; \
614 *(.security_initcall.init) \
615 VMLINUX_SYMBOL(__security_initcall_end) = .;
617 #ifdef CONFIG_BLK_DEV_INITRD
618 #define INIT_RAM_FS \
619 . = ALIGN(PAGE_SIZE); \
620 VMLINUX_SYMBOL(__initramfs_start) = .; \
621 *(.init.ramfs) \
622 VMLINUX_SYMBOL(__initramfs_end) = .;
623 #else
624 #define INIT_RAM_FS
625 #endif
627 /*
628 * Default discarded sections.
629 *
630 * Some archs want to discard exit text/data at runtime rather than
631 * link time due to cross-section references such as alt instructions,
632 * bug table, eh_frame, etc. DISCARDS must be the last of output
633 * section definitions so that such archs put those in earlier section
634 * definitions.
635 */
636 #define DISCARDS \
637 /DISCARD/ : { \
638 EXIT_TEXT \
639 EXIT_DATA \
640 EXIT_CALL \
641 *(.discard) \
642 }
644 /**
645 * PERCPU_VADDR - define output section for percpu area
646 * @vaddr: explicit base address (optional)
647 * @phdr: destination PHDR (optional)
648 *
649 * Macro which expands to output section for percpu area. If @vaddr
650 * is not blank, it specifies explicit base address and all percpu
651 * symbols will be offset from the given address. If blank, @vaddr
652 * always equals @laddr + LOAD_OFFSET.
653 *
654 * @phdr defines the output PHDR to use if not blank. Be warned that
655 * output PHDR is sticky. If @phdr is specified, the next output
656 * section in the linker script will go there too. @phdr should have
657 * a leading colon.
658 *
659 * Note that this macros defines __per_cpu_load as an absolute symbol.
660 * If there is no need to put the percpu section at a predetermined
661 * address, use PERCPU().
662 */
663 #define PERCPU_VADDR(vaddr, phdr) \
664 VMLINUX_SYMBOL(__per_cpu_load) = .; \
665 .data.percpu vaddr : AT(VMLINUX_SYMBOL(__per_cpu_load) \
666 - LOAD_OFFSET) { \
667 VMLINUX_SYMBOL(__per_cpu_start) = .; \
668 *(.data.percpu.first) \
669 *(.data.percpu.page_aligned) \
670 *(.data.percpu) \
671 *(.data.percpu.shared_aligned) \
672 VMLINUX_SYMBOL(__per_cpu_end) = .; \
673 } phdr \
674 . = VMLINUX_SYMBOL(__per_cpu_load) + SIZEOF(.data.percpu);
676 /**
677 * PERCPU - define output section for percpu area, simple version
678 * @align: required alignment
679 *
680 * Align to @align and outputs output section for percpu area. This
681 * macro doesn't maniuplate @vaddr or @phdr and __per_cpu_load and
682 * __per_cpu_start will be identical.
683 *
684 * This macro is equivalent to ALIGN(align); PERCPU_VADDR( , ) except
685 * that __per_cpu_load is defined as a relative symbol against
686 * .data.percpu which is required for relocatable x86_32
687 * configuration.
688 */
689 #define PERCPU(align) \
690 . = ALIGN(align); \
691 .data.percpu : AT(ADDR(.data.percpu) - LOAD_OFFSET) { \
692 VMLINUX_SYMBOL(__per_cpu_load) = .; \
693 VMLINUX_SYMBOL(__per_cpu_start) = .; \
694 *(.data.percpu.first) \
695 *(.data.percpu.page_aligned) \
696 *(.data.percpu) \
697 *(.data.percpu.shared_aligned) \
698 VMLINUX_SYMBOL(__per_cpu_end) = .; \
699 }
702 /*
703 * Definition of the high level *_SECTION macros
704 * They will fit only a subset of the architectures
705 */
708 /*
709 * Writeable data.
710 * All sections are combined in a single .data section.
711 * The sections following CONSTRUCTORS are arranged so their
712 * typical alignment matches.
713 * A cacheline is typical/always less than a PAGE_SIZE so
714 * the sections that has this restriction (or similar)
715 * is located before the ones requiring PAGE_SIZE alignment.
716 * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which
717 * matches the requirment of PAGE_ALIGNED_DATA.
718 *
719 * use 0 as page_align if page_aligned data is not used */
720 #define RW_DATA_SECTION(cacheline, pagealigned, inittask) \
721 . = ALIGN(PAGE_SIZE); \
722 .data : AT(ADDR(.data) - LOAD_OFFSET) { \
723 INIT_TASK_DATA(inittask) \
724 NOSAVE_DATA \
725 PAGE_ALIGNED_DATA(pagealigned) \
726 CACHELINE_ALIGNED_DATA(cacheline) \
727 READ_MOSTLY_DATA(cacheline) \
728 DATA_DATA \
729 CONSTRUCTORS \
730 }
732 #define INIT_TEXT_SECTION(inittext_align) \
733 . = ALIGN(inittext_align); \
734 .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) { \
735 VMLINUX_SYMBOL(_sinittext) = .; \
736 INIT_TEXT \
737 VMLINUX_SYMBOL(_einittext) = .; \
738 }
740 #define INIT_DATA_SECTION(initsetup_align) \
741 .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) { \
742 INIT_DATA \
743 INIT_SETUP(initsetup_align) \
744 INIT_CALLS \
745 CON_INITCALL \
746 SECURITY_INITCALL \
747 INIT_RAM_FS \
748 }
750 #define BSS_SECTION(sbss_align, bss_align, stop_align) \
751 . = ALIGN(sbss_align); \
752 VMLINUX_SYMBOL(__bss_start) = .; \
753 SBSS(sbss_align) \
754 BSS(bss_align) \
755 . = ALIGN(stop_align); \
756 VMLINUX_SYMBOL(__bss_stop) = .;