| blob | 32c45e5fe0abfa4516fb3b56103b68b134b1d70c |
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 */
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___verbose) = .; \
175 *(__verbose) \
176 VMLINUX_SYMBOL(__stop___verbose) = .; \
177 LIKELY_PROFILE() \
178 BRANCH_PROFILE() \
179 TRACE_PRINTKS()
181 /*
182 * Data section helpers
183 */
184 #define NOSAVE_DATA \
185 . = ALIGN(PAGE_SIZE); \
186 VMLINUX_SYMBOL(__nosave_begin) = .; \
187 *(.data..nosave) \
188 . = ALIGN(PAGE_SIZE); \
189 VMLINUX_SYMBOL(__nosave_end) = .;
191 #define PAGE_ALIGNED_DATA(page_align) \
192 . = ALIGN(page_align); \
193 *(.data..page_aligned)
195 #define READ_MOSTLY_DATA(align) \
196 . = ALIGN(align); \
197 *(.data..read_mostly) \
198 . = ALIGN(align);
200 #define CACHELINE_ALIGNED_DATA(align) \
201 . = ALIGN(align); \
202 *(.data..cacheline_aligned)
204 #define INIT_TASK_DATA(align) \
205 . = ALIGN(align); \
206 *(.data..init_task)
208 /*
209 * Read only Data
210 */
211 #define RO_DATA_SECTION(align) \
212 . = ALIGN((align)); \
213 .rodata : AT(ADDR(.rodata) - LOAD_OFFSET) { \
214 VMLINUX_SYMBOL(__start_rodata) = .; \
215 *(.rodata) *(.rodata.*) \
217 . = ALIGN(8); \
218 VMLINUX_SYMBOL(__start___tracepoints_ptrs) = .; \
220 VMLINUX_SYMBOL(__stop___tracepoints_ptrs) = .; \
223 } \
224 \
225 .rodata1 : AT(ADDR(.rodata1) - LOAD_OFFSET) { \
226 *(.rodata1) \
227 } \
228 \
229 BUG_TABLE \
230 \
231 JUMP_TABLE \
232 \
234 .pci_fixup : AT(ADDR(.pci_fixup) - LOAD_OFFSET) { \
235 VMLINUX_SYMBOL(__start_pci_fixups_early) = .; \
236 *(.pci_fixup_early) \
237 VMLINUX_SYMBOL(__end_pci_fixups_early) = .; \
238 VMLINUX_SYMBOL(__start_pci_fixups_header) = .; \
239 *(.pci_fixup_header) \
240 VMLINUX_SYMBOL(__end_pci_fixups_header) = .; \
241 VMLINUX_SYMBOL(__start_pci_fixups_final) = .; \
242 *(.pci_fixup_final) \
243 VMLINUX_SYMBOL(__end_pci_fixups_final) = .; \
244 VMLINUX_SYMBOL(__start_pci_fixups_enable) = .; \
245 *(.pci_fixup_enable) \
246 VMLINUX_SYMBOL(__end_pci_fixups_enable) = .; \
247 VMLINUX_SYMBOL(__start_pci_fixups_resume) = .; \
248 *(.pci_fixup_resume) \
249 VMLINUX_SYMBOL(__end_pci_fixups_resume) = .; \
250 VMLINUX_SYMBOL(__start_pci_fixups_resume_early) = .; \
251 *(.pci_fixup_resume_early) \
252 VMLINUX_SYMBOL(__end_pci_fixups_resume_early) = .; \
253 VMLINUX_SYMBOL(__start_pci_fixups_suspend) = .; \
254 *(.pci_fixup_suspend) \
255 VMLINUX_SYMBOL(__end_pci_fixups_suspend) = .; \
256 } \
257 \
259 .builtin_fw : AT(ADDR(.builtin_fw) - LOAD_OFFSET) { \
260 VMLINUX_SYMBOL(__start_builtin_fw) = .; \
261 *(.builtin_fw) \
262 VMLINUX_SYMBOL(__end_builtin_fw) = .; \
263 } \
264 \
266 .rio_ops : AT(ADDR(.rio_ops) - LOAD_OFFSET) { \
267 VMLINUX_SYMBOL(__start_rio_switch_ops) = .; \
268 *(.rio_switch_ops) \
269 VMLINUX_SYMBOL(__end_rio_switch_ops) = .; \
270 } \
271 \
272 TRACEDATA \
273 \
275 __ksymtab : AT(ADDR(__ksymtab) - LOAD_OFFSET) { \
276 VMLINUX_SYMBOL(__start___ksymtab) = .; \
277 *(__ksymtab) \
278 VMLINUX_SYMBOL(__stop___ksymtab) = .; \
279 } \
280 \
282 __ksymtab_gpl : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) { \
283 VMLINUX_SYMBOL(__start___ksymtab_gpl) = .; \
284 *(__ksymtab_gpl) \
285 VMLINUX_SYMBOL(__stop___ksymtab_gpl) = .; \
286 } \
287 \
289 __ksymtab_unused : AT(ADDR(__ksymtab_unused) - LOAD_OFFSET) { \
290 VMLINUX_SYMBOL(__start___ksymtab_unused) = .; \
291 *(__ksymtab_unused) \
292 VMLINUX_SYMBOL(__stop___ksymtab_unused) = .; \
293 } \
294 \
296 __ksymtab_unused_gpl : AT(ADDR(__ksymtab_unused_gpl) - LOAD_OFFSET) { \
297 VMLINUX_SYMBOL(__start___ksymtab_unused_gpl) = .; \
298 *(__ksymtab_unused_gpl) \
299 VMLINUX_SYMBOL(__stop___ksymtab_unused_gpl) = .; \
300 } \
301 \
303 __ksymtab_gpl_future : AT(ADDR(__ksymtab_gpl_future) - LOAD_OFFSET) { \
304 VMLINUX_SYMBOL(__start___ksymtab_gpl_future) = .; \
305 *(__ksymtab_gpl_future) \
306 VMLINUX_SYMBOL(__stop___ksymtab_gpl_future) = .; \
307 } \
308 \
310 __kcrctab : AT(ADDR(__kcrctab) - LOAD_OFFSET) { \
311 VMLINUX_SYMBOL(__start___kcrctab) = .; \
312 *(__kcrctab) \
313 VMLINUX_SYMBOL(__stop___kcrctab) = .; \
314 } \
315 \
317 __kcrctab_gpl : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) { \
318 VMLINUX_SYMBOL(__start___kcrctab_gpl) = .; \
319 *(__kcrctab_gpl) \
320 VMLINUX_SYMBOL(__stop___kcrctab_gpl) = .; \
321 } \
322 \
324 __kcrctab_unused : AT(ADDR(__kcrctab_unused) - LOAD_OFFSET) { \
325 VMLINUX_SYMBOL(__start___kcrctab_unused) = .; \
326 *(__kcrctab_unused) \
327 VMLINUX_SYMBOL(__stop___kcrctab_unused) = .; \
328 } \
329 \
331 __kcrctab_unused_gpl : AT(ADDR(__kcrctab_unused_gpl) - LOAD_OFFSET) { \
332 VMLINUX_SYMBOL(__start___kcrctab_unused_gpl) = .; \
333 *(__kcrctab_unused_gpl) \
334 VMLINUX_SYMBOL(__stop___kcrctab_unused_gpl) = .; \
335 } \
336 \
338 __kcrctab_gpl_future : AT(ADDR(__kcrctab_gpl_future) - LOAD_OFFSET) { \
339 VMLINUX_SYMBOL(__start___kcrctab_gpl_future) = .; \
340 *(__kcrctab_gpl_future) \
341 VMLINUX_SYMBOL(__stop___kcrctab_gpl_future) = .; \
342 } \
343 \
345 __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \
346 *(__ksymtab_strings) \
347 } \
348 \
350 __init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) { \
351 *(.ref.rodata) \
352 DEV_KEEP(init.rodata) \
353 DEV_KEEP(exit.rodata) \
354 CPU_KEEP(init.rodata) \
355 CPU_KEEP(exit.rodata) \
356 MEM_KEEP(init.rodata) \
357 MEM_KEEP(exit.rodata) \
358 } \
359 \
361 __param : AT(ADDR(__param) - LOAD_OFFSET) { \
362 VMLINUX_SYMBOL(__start___param) = .; \
363 *(__param) \
364 VMLINUX_SYMBOL(__stop___param) = .; \
365 } \
366 \
368 __modver : AT(ADDR(__modver) - LOAD_OFFSET) { \
369 VMLINUX_SYMBOL(__start___modver) = .; \
370 *(__modver) \
371 VMLINUX_SYMBOL(__stop___modver) = .; \
372 . = ALIGN((align)); \
373 VMLINUX_SYMBOL(__end_rodata) = .; \
374 } \
375 . = ALIGN((align));
377 /* RODATA & RO_DATA provided for backward compatibility.
378 * All archs are supposed to use RO_DATA() */
379 #define RODATA RO_DATA_SECTION(4096)
380 #define RO_DATA(align) RO_DATA_SECTION(align)
382 #define SECURITY_INIT \
383 .security_initcall.init : AT(ADDR(.security_initcall.init) - LOAD_OFFSET) { \
384 VMLINUX_SYMBOL(__security_initcall_start) = .; \
385 *(.security_initcall.init) \
386 VMLINUX_SYMBOL(__security_initcall_end) = .; \
387 }
389 /* .text section. Map to function alignment to avoid address changes
390 * during second ld run in second ld pass when generating System.map */
391 #define TEXT_TEXT \
392 ALIGN_FUNCTION(); \
393 *(.text.hot) \
394 *(.text) \
395 *(.ref.text) \
396 DEV_KEEP(init.text) \
397 DEV_KEEP(exit.text) \
398 CPU_KEEP(init.text) \
399 CPU_KEEP(exit.text) \
400 MEM_KEEP(init.text) \
401 MEM_KEEP(exit.text) \
402 *(.text.unlikely)
405 /* sched.text is aling to function alignment to secure we have same
406 * address even at second ld pass when generating System.map */
407 #define SCHED_TEXT \
408 ALIGN_FUNCTION(); \
409 VMLINUX_SYMBOL(__sched_text_start) = .; \
410 *(.sched.text) \
411 VMLINUX_SYMBOL(__sched_text_end) = .;
413 /* spinlock.text is aling to function alignment to secure we have same
414 * address even at second ld pass when generating System.map */
415 #define LOCK_TEXT \
416 ALIGN_FUNCTION(); \
417 VMLINUX_SYMBOL(__lock_text_start) = .; \
418 *(.spinlock.text) \
419 VMLINUX_SYMBOL(__lock_text_end) = .;
421 #define KPROBES_TEXT \
422 ALIGN_FUNCTION(); \
423 VMLINUX_SYMBOL(__kprobes_text_start) = .; \
424 *(.kprobes.text) \
425 VMLINUX_SYMBOL(__kprobes_text_end) = .;
427 #define ENTRY_TEXT \
428 ALIGN_FUNCTION(); \
429 VMLINUX_SYMBOL(__entry_text_start) = .; \
430 *(.entry.text) \
431 VMLINUX_SYMBOL(__entry_text_end) = .;
433 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
434 #define IRQENTRY_TEXT \
435 ALIGN_FUNCTION(); \
436 VMLINUX_SYMBOL(__irqentry_text_start) = .; \
437 *(.irqentry.text) \
438 VMLINUX_SYMBOL(__irqentry_text_end) = .;
439 #else
440 #define IRQENTRY_TEXT
441 #endif
443 /* Section used for early init (in .S files) */
444 #define HEAD_TEXT *(.head.text)
446 #define HEAD_TEXT_SECTION \
447 .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) { \
448 HEAD_TEXT \
449 }
451 /*
452 * Exception table
453 */
454 #define EXCEPTION_TABLE(align) \
455 . = ALIGN(align); \
456 __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) { \
457 VMLINUX_SYMBOL(__start___ex_table) = .; \
458 *(__ex_table) \
459 VMLINUX_SYMBOL(__stop___ex_table) = .; \
460 }
462 /*
463 * Init task
464 */
465 #define INIT_TASK_DATA_SECTION(align) \
466 . = ALIGN(align); \
467 .data..init_task : AT(ADDR(.data..init_task) - LOAD_OFFSET) { \
468 INIT_TASK_DATA(align) \
469 }
471 #ifdef CONFIG_CONSTRUCTORS
472 #define KERNEL_CTORS() . = ALIGN(8); \
473 VMLINUX_SYMBOL(__ctors_start) = .; \
474 *(.ctors) \
475 VMLINUX_SYMBOL(__ctors_end) = .;
476 #else
477 #define KERNEL_CTORS()
478 #endif
480 /* init and exit section handling */
481 #define INIT_DATA \
482 *(.init.data) \
483 DEV_DISCARD(init.data) \
484 CPU_DISCARD(init.data) \
485 MEM_DISCARD(init.data) \
486 KERNEL_CTORS() \
487 *(.init.rodata) \
488 MCOUNT_REC() \
489 FTRACE_EVENTS() \
490 TRACE_SYSCALLS() \
491 DEV_DISCARD(init.rodata) \
492 CPU_DISCARD(init.rodata) \
493 MEM_DISCARD(init.rodata) \
494 KERNEL_DTB()
496 #define INIT_TEXT \
497 *(.init.text) \
498 DEV_DISCARD(init.text) \
499 CPU_DISCARD(init.text) \
500 MEM_DISCARD(init.text)
502 #define EXIT_DATA \
503 *(.exit.data) \
504 DEV_DISCARD(exit.data) \
505 DEV_DISCARD(exit.rodata) \
506 CPU_DISCARD(exit.data) \
507 CPU_DISCARD(exit.rodata) \
508 MEM_DISCARD(exit.data) \
509 MEM_DISCARD(exit.rodata)
511 #define EXIT_TEXT \
512 *(.exit.text) \
513 DEV_DISCARD(exit.text) \
514 CPU_DISCARD(exit.text) \
515 MEM_DISCARD(exit.text)
517 #define EXIT_CALL \
518 *(.exitcall.exit)
520 /*
521 * bss (Block Started by Symbol) - uninitialized data
522 * zeroed during startup
523 */
524 #define SBSS(sbss_align) \
525 . = ALIGN(sbss_align); \
526 .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) { \
527 *(.sbss) \
528 *(.scommon) \
529 }
531 #define BSS(bss_align) \
532 . = ALIGN(bss_align); \
533 .bss : AT(ADDR(.bss) - LOAD_OFFSET) { \
534 *(.bss..page_aligned) \
535 *(.dynbss) \
536 *(.bss) \
537 *(COMMON) \
538 }
540 /*
541 * DWARF debug sections.
542 * Symbols in the DWARF debugging sections are relative to
543 * the beginning of the section so we begin them at 0.
544 */
545 #define DWARF_DEBUG \
547 .debug 0 : { *(.debug) } \
548 .line 0 : { *(.line) } \
550 .debug_srcinfo 0 : { *(.debug_srcinfo) } \
551 .debug_sfnames 0 : { *(.debug_sfnames) } \
553 .debug_aranges 0 : { *(.debug_aranges) } \
554 .debug_pubnames 0 : { *(.debug_pubnames) } \
556 .debug_info 0 : { *(.debug_info \
557 .gnu.linkonce.wi.*) } \
558 .debug_abbrev 0 : { *(.debug_abbrev) } \
559 .debug_line 0 : { *(.debug_line) } \
560 .debug_frame 0 : { *(.debug_frame) } \
561 .debug_str 0 : { *(.debug_str) } \
562 .debug_loc 0 : { *(.debug_loc) } \
563 .debug_macinfo 0 : { *(.debug_macinfo) } \
565 .debug_weaknames 0 : { *(.debug_weaknames) } \
566 .debug_funcnames 0 : { *(.debug_funcnames) } \
567 .debug_typenames 0 : { *(.debug_typenames) } \
568 .debug_varnames 0 : { *(.debug_varnames) } \
570 /* Stabs debugging sections. */
571 #define STABS_DEBUG \
572 .stab 0 : { *(.stab) } \
573 .stabstr 0 : { *(.stabstr) } \
574 .stab.excl 0 : { *(.stab.excl) } \
575 .stab.exclstr 0 : { *(.stab.exclstr) } \
576 .stab.index 0 : { *(.stab.index) } \
577 .stab.indexstr 0 : { *(.stab.indexstr) } \
578 .comment 0 : { *(.comment) }
580 #ifdef CONFIG_GENERIC_BUG
581 #define BUG_TABLE \
582 . = ALIGN(8); \
583 __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) { \
584 VMLINUX_SYMBOL(__start___bug_table) = .; \
585 *(__bug_table) \
586 VMLINUX_SYMBOL(__stop___bug_table) = .; \
587 }
588 #else
589 #define BUG_TABLE
590 #endif
592 #define JUMP_TABLE \
593 . = ALIGN(8); \
594 __jump_table : AT(ADDR(__jump_table) - LOAD_OFFSET) { \
595 VMLINUX_SYMBOL(__start___jump_table) = .; \
596 *(__jump_table) \
597 VMLINUX_SYMBOL(__stop___jump_table) = .; \
598 }
600 #ifdef CONFIG_PM_TRACE
601 #define TRACEDATA \
602 . = ALIGN(4); \
603 .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) { \
604 VMLINUX_SYMBOL(__tracedata_start) = .; \
605 *(.tracedata) \
606 VMLINUX_SYMBOL(__tracedata_end) = .; \
607 }
608 #else
609 #define TRACEDATA
610 #endif
612 #define NOTES \
613 .notes : AT(ADDR(.notes) - LOAD_OFFSET) { \
614 VMLINUX_SYMBOL(__start_notes) = .; \
615 *(.note.*) \
616 VMLINUX_SYMBOL(__stop_notes) = .; \
617 }
619 #define INIT_SETUP(initsetup_align) \
620 . = ALIGN(initsetup_align); \
621 VMLINUX_SYMBOL(__setup_start) = .; \
622 *(.init.setup) \
623 VMLINUX_SYMBOL(__setup_end) = .;
625 #define INITCALLS \
626 *(.initcallearly.init) \
627 VMLINUX_SYMBOL(__early_initcall_end) = .; \
628 *(.initcall0.init) \
629 *(.initcall0s.init) \
630 *(.initcall1.init) \
631 *(.initcall1s.init) \
632 *(.initcall2.init) \
633 *(.initcall2s.init) \
634 *(.initcall3.init) \
635 *(.initcall3s.init) \
636 *(.initcall4.init) \
637 *(.initcall4s.init) \
638 *(.initcall5.init) \
639 *(.initcall5s.init) \
640 *(.initcallrootfs.init) \
641 *(.initcall6.init) \
642 *(.initcall6s.init) \
643 *(.initcall7.init) \
644 *(.initcall7s.init)
646 #define INIT_CALLS \
647 VMLINUX_SYMBOL(__initcall_start) = .; \
648 INITCALLS \
649 VMLINUX_SYMBOL(__initcall_end) = .;
651 #define CON_INITCALL \
652 VMLINUX_SYMBOL(__con_initcall_start) = .; \
653 *(.con_initcall.init) \
654 VMLINUX_SYMBOL(__con_initcall_end) = .;
656 #define SECURITY_INITCALL \
657 VMLINUX_SYMBOL(__security_initcall_start) = .; \
658 *(.security_initcall.init) \
659 VMLINUX_SYMBOL(__security_initcall_end) = .;
661 #ifdef CONFIG_BLK_DEV_INITRD
662 #define INIT_RAM_FS \
663 . = ALIGN(4); \
664 VMLINUX_SYMBOL(__initramfs_start) = .; \
665 *(.init.ramfs) \
666 . = ALIGN(8); \
667 *(.init.ramfs.info)
668 #else
669 #define INIT_RAM_FS
670 #endif
672 /*
673 * Default discarded sections.
674 *
675 * Some archs want to discard exit text/data at runtime rather than
676 * link time due to cross-section references such as alt instructions,
677 * bug table, eh_frame, etc. DISCARDS must be the last of output
678 * section definitions so that such archs put those in earlier section
679 * definitions.
680 */
681 #define DISCARDS \
682 /DISCARD/ : { \
683 EXIT_TEXT \
684 EXIT_DATA \
685 EXIT_CALL \
686 *(.discard) \
687 *(.discard.*) \
688 }
690 /**
691 * PERCPU_VADDR - define output section for percpu area
692 * @cacheline: cacheline size
693 * @vaddr: explicit base address (optional)
694 * @phdr: destination PHDR (optional)
695 *
696 * Macro which expands to output section for percpu area.
697 *
698 * @cacheline is used to align subsections to avoid false cacheline
699 * sharing between subsections for different purposes.
700 *
701 * If @vaddr is not blank, it specifies explicit base address and all
702 * percpu symbols will be offset from the given address. If blank,
703 * @vaddr always equals @laddr + LOAD_OFFSET.
704 *
705 * @phdr defines the output PHDR to use if not blank. Be warned that
706 * output PHDR is sticky. If @phdr is specified, the next output
707 * section in the linker script will go there too. @phdr should have
708 * a leading colon.
709 *
710 * Note that this macros defines __per_cpu_load as an absolute symbol.
711 * If there is no need to put the percpu section at a predetermined
712 * address, use PERCPU().
713 */
714 #define PERCPU_VADDR(cacheline, vaddr, phdr) \
715 VMLINUX_SYMBOL(__per_cpu_load) = .; \
716 .data..percpu vaddr : AT(VMLINUX_SYMBOL(__per_cpu_load) \
717 - LOAD_OFFSET) { \
718 VMLINUX_SYMBOL(__per_cpu_start) = .; \
719 *(.data..percpu..first) \
720 . = ALIGN(PAGE_SIZE); \
721 *(.data..percpu..page_aligned) \
722 . = ALIGN(cacheline); \
723 *(.data..percpu..readmostly) \
724 . = ALIGN(cacheline); \
725 *(.data..percpu) \
726 *(.data..percpu..shared_aligned) \
727 VMLINUX_SYMBOL(__per_cpu_end) = .; \
728 } phdr \
729 . = VMLINUX_SYMBOL(__per_cpu_load) + SIZEOF(.data..percpu);
731 /**
732 * PERCPU - define output section for percpu area, simple version
733 * @cacheline: cacheline size
734 * @align: required alignment
735 *
736 * Align to @align and outputs output section for percpu area. This macro
737 * doesn't manipulate @vaddr or @phdr and __per_cpu_load and
738 * __per_cpu_start will be identical.
739 *
740 * This macro is equivalent to ALIGN(@align); PERCPU_VADDR(@cacheline,,)
741 * except that __per_cpu_load is defined as a relative symbol against
742 * .data..percpu which is required for relocatable x86_32 configuration.
743 */
744 #define PERCPU(cacheline, align) \
745 . = ALIGN(align); \
746 .data..percpu : AT(ADDR(.data..percpu) - LOAD_OFFSET) { \
747 VMLINUX_SYMBOL(__per_cpu_load) = .; \
748 VMLINUX_SYMBOL(__per_cpu_start) = .; \
749 *(.data..percpu..first) \
750 . = ALIGN(PAGE_SIZE); \
751 *(.data..percpu..page_aligned) \
752 . = ALIGN(cacheline); \
753 *(.data..percpu..readmostly) \
754 . = ALIGN(cacheline); \
755 *(.data..percpu) \
756 *(.data..percpu..shared_aligned) \
757 VMLINUX_SYMBOL(__per_cpu_end) = .; \
758 }
761 /*
762 * Definition of the high level *_SECTION macros
763 * They will fit only a subset of the architectures
764 */
767 /*
768 * Writeable data.
769 * All sections are combined in a single .data section.
770 * The sections following CONSTRUCTORS are arranged so their
771 * typical alignment matches.
772 * A cacheline is typical/always less than a PAGE_SIZE so
773 * the sections that has this restriction (or similar)
774 * is located before the ones requiring PAGE_SIZE alignment.
775 * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which
776 * matches the requirment of PAGE_ALIGNED_DATA.
777 *
778 * use 0 as page_align if page_aligned data is not used */
779 #define RW_DATA_SECTION(cacheline, pagealigned, inittask) \
780 . = ALIGN(PAGE_SIZE); \
781 .data : AT(ADDR(.data) - LOAD_OFFSET) { \
782 INIT_TASK_DATA(inittask) \
783 NOSAVE_DATA \
784 PAGE_ALIGNED_DATA(pagealigned) \
785 CACHELINE_ALIGNED_DATA(cacheline) \
786 READ_MOSTLY_DATA(cacheline) \
787 DATA_DATA \
788 CONSTRUCTORS \
789 }
791 #define INIT_TEXT_SECTION(inittext_align) \
792 . = ALIGN(inittext_align); \
793 .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) { \
794 VMLINUX_SYMBOL(_sinittext) = .; \
795 INIT_TEXT \
796 VMLINUX_SYMBOL(_einittext) = .; \
797 }
799 #define INIT_DATA_SECTION(initsetup_align) \
800 .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) { \
801 INIT_DATA \
802 INIT_SETUP(initsetup_align) \
803 INIT_CALLS \
804 CON_INITCALL \
805 SECURITY_INITCALL \
806 INIT_RAM_FS \
807 }
809 #define BSS_SECTION(sbss_align, bss_align, stop_align) \
810 . = ALIGN(sbss_align); \
811 VMLINUX_SYMBOL(__bss_start) = .; \
812 SBSS(sbss_align) \
813 BSS(bss_align) \
814 . = ALIGN(stop_align); \
815 VMLINUX_SYMBOL(__bss_stop) = .;