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 * // __init_begin and __init_end should be page aligned, so that we can
44 * // free the whole .init memory
45 * [_stext, _etext] is the text section
46 * [_sdata, _edata] is the data section
47 *
48 * Some of the included output section have their own set of constants.
49 * Examples are: [__initramfs_start, __initramfs_end] for initramfs and
50 * [__nosave_begin, __nosave_end] for the nosave data
51 */
52
53 #ifndef LOAD_OFFSET
54 #define LOAD_OFFSET 0
55 #endif
56
57 /* Align . to a 8 byte boundary equals to maximum function alignment. */
58 #define ALIGN_FUNCTION() . = ALIGN(8)
59
60 /*
61 * LD_DEAD_CODE_DATA_ELIMINATION option enables -fdata-sections, which
62 * generates .data.identifier sections, which need to be pulled in with
63 * .data. We don't want to pull in .data..other sections, which Linux
64 * has defined. Same for text and bss.
65 *
66 * RODATA_MAIN is not used because existing code already defines .rodata.x
67 * sections to be brought in with rodata.
68 */
69 #ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
70 #define TEXT_MAIN .text .text.[0-9a-zA-Z_]*
71 #define DATA_MAIN .data .data.[0-9a-zA-Z_]* .data..LPBX*
72 #define SDATA_MAIN .sdata .sdata.[0-9a-zA-Z_]*
73 #define RODATA_MAIN .rodata .rodata.[0-9a-zA-Z_]*
74 #define BSS_MAIN .bss .bss.[0-9a-zA-Z_]*
75 #define SBSS_MAIN .sbss .sbss.[0-9a-zA-Z_]*
76 #else
77 #define TEXT_MAIN .text
78 #define DATA_MAIN .data
79 #define SDATA_MAIN .sdata
80 #define RODATA_MAIN .rodata
81 #define BSS_MAIN .bss
82 #define SBSS_MAIN .sbss
83 #endif
84
85 /*
86 * Align to a 32 byte boundary equal to the
87 * alignment gcc 4.5 uses for a struct
88 */
89 #define STRUCT_ALIGNMENT 32
90 #define STRUCT_ALIGN() . = ALIGN(STRUCT_ALIGNMENT)
91
92 /* The actual configuration determine if the init/exit sections
93 * are handled as text/data or they can be discarded (which
94 * often happens at runtime)
95 */
96 #ifdef CONFIG_HOTPLUG_CPU
97 #define CPU_KEEP(sec) *(.cpu##sec)
98 #define CPU_DISCARD(sec)
99 #else
100 #define CPU_KEEP(sec)
101 #define CPU_DISCARD(sec) *(.cpu##sec)
102 #endif
103
104 #if defined(CONFIG_MEMORY_HOTPLUG)
105 #define MEM_KEEP(sec) *(.mem##sec)
106 #define MEM_DISCARD(sec)
107 #else
108 #define MEM_KEEP(sec)
109 #define MEM_DISCARD(sec) *(.mem##sec)
110 #endif
111
112 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
113 #ifdef CC_USING_PATCHABLE_FUNCTION_ENTRY
114 #define MCOUNT_REC() . = ALIGN(8); \
115 __start_mcount_loc = .; \
116 KEEP(*(__patchable_function_entries)) \
117 __stop_mcount_loc = .;
118 #else
119 #define MCOUNT_REC() . = ALIGN(8); \
120 __start_mcount_loc = .; \
121 KEEP(*(__mcount_loc)) \
122 __stop_mcount_loc = .;
123 #endif
124 #else
125 #define MCOUNT_REC()
126 #endif
127
128 #ifdef CONFIG_TRACE_BRANCH_PROFILING
129 #define LIKELY_PROFILE() __start_annotated_branch_profile = .; \
130 KEEP(*(_ftrace_annotated_branch)) \
131 __stop_annotated_branch_profile = .;
132 #else
133 #define LIKELY_PROFILE()
134 #endif
135
136 #ifdef CONFIG_PROFILE_ALL_BRANCHES
137 #define BRANCH_PROFILE() __start_branch_profile = .; \
138 KEEP(*(_ftrace_branch)) \
139 __stop_branch_profile = .;
140 #else
141 #define BRANCH_PROFILE()
142 #endif
143
144 #ifdef CONFIG_KPROBES
145 #define KPROBE_BLACKLIST() . = ALIGN(8); \
146 __start_kprobe_blacklist = .; \
147 KEEP(*(_kprobe_blacklist)) \
148 __stop_kprobe_blacklist = .;
149 #else
150 #define KPROBE_BLACKLIST()
151 #endif
152
153 #ifdef CONFIG_FUNCTION_ERROR_INJECTION
154 #define ERROR_INJECT_WHITELIST() STRUCT_ALIGN(); \
155 __start_error_injection_whitelist = .; \
156 KEEP(*(_error_injection_whitelist)) \
157 __stop_error_injection_whitelist = .;
158 #else
159 #define ERROR_INJECT_WHITELIST()
160 #endif
161
162 #ifdef CONFIG_EVENT_TRACING
163 #define FTRACE_EVENTS() . = ALIGN(8); \
164 __start_ftrace_events = .; \
165 KEEP(*(_ftrace_events)) \
166 __stop_ftrace_events = .; \
167 __start_ftrace_eval_maps = .; \
168 KEEP(*(_ftrace_eval_map)) \
169 __stop_ftrace_eval_maps = .;
170 #else
171 #define FTRACE_EVENTS()
172 #endif
173
174 #ifdef CONFIG_TRACING
175 #define TRACE_PRINTKS() __start___trace_bprintk_fmt = .; \
176 KEEP(*(__trace_printk_fmt)) /* Trace_printk fmt' pointer */ \
177 __stop___trace_bprintk_fmt = .;
178 #define TRACEPOINT_STR() __start___tracepoint_str = .; \
179 KEEP(*(__tracepoint_str)) /* Trace_printk fmt' pointer */ \
180 __stop___tracepoint_str = .;
181 #else
182 #define TRACE_PRINTKS()
183 #define TRACEPOINT_STR()
184 #endif
185
186 #ifdef CONFIG_FTRACE_SYSCALLS
187 #define TRACE_SYSCALLS() . = ALIGN(8); \
188 __start_syscalls_metadata = .; \
189 KEEP(*(__syscalls_metadata)) \
190 __stop_syscalls_metadata = .;
191 #else
192 #define TRACE_SYSCALLS()
193 #endif
194
195 #ifdef CONFIG_BPF_EVENTS
196 #define BPF_RAW_TP() STRUCT_ALIGN(); \
197 __start__bpf_raw_tp = .; \
198 KEEP(*(__bpf_raw_tp_map)) \
199 __stop__bpf_raw_tp = .;
200 #else
201 #define BPF_RAW_TP()
202 #endif
203
204 #ifdef CONFIG_SERIAL_EARLYCON
205 #define EARLYCON_TABLE() . = ALIGN(8); \
206 __earlycon_table = .; \
207 KEEP(*(__earlycon_table)) \
208 __earlycon_table_end = .;
209 #else
210 #define EARLYCON_TABLE()
211 #endif
212
213 #ifdef CONFIG_SECURITY
214 #define LSM_TABLE() . = ALIGN(8); \
215 __start_lsm_info = .; \
216 KEEP(*(.lsm_info.init)) \
217 __end_lsm_info = .;
218 #define EARLY_LSM_TABLE() . = ALIGN(8); \
219 __start_early_lsm_info = .; \
220 KEEP(*(.early_lsm_info.init)) \
221 __end_early_lsm_info = .;
222 #else
223 #define LSM_TABLE()
224 #define EARLY_LSM_TABLE()
225 #endif
226
227 #define ___OF_TABLE(cfg, name) _OF_TABLE_##cfg(name)
228 #define __OF_TABLE(cfg, name) ___OF_TABLE(cfg, name)
229 #define OF_TABLE(cfg, name) __OF_TABLE(IS_ENABLED(cfg), name)
230 #define _OF_TABLE_0(name)
231 #define _OF_TABLE_1(name) \
232 . = ALIGN(8); \
233 __##name##_of_table = .; \
234 KEEP(*(__##name##_of_table)) \
235 KEEP(*(__##name##_of_table_end))
236
237 #define TIMER_OF_TABLES() OF_TABLE(CONFIG_TIMER_OF, timer)
238 #define IRQCHIP_OF_MATCH_TABLE() OF_TABLE(CONFIG_IRQCHIP, irqchip)
239 #define CLK_OF_TABLES() OF_TABLE(CONFIG_COMMON_CLK, clk)
240 #define RESERVEDMEM_OF_TABLES() OF_TABLE(CONFIG_OF_RESERVED_MEM, reservedmem)
241 #define CPU_METHOD_OF_TABLES() OF_TABLE(CONFIG_SMP, cpu_method)
242 #define CPUIDLE_METHOD_OF_TABLES() OF_TABLE(CONFIG_CPU_IDLE, cpuidle_method)
243
244 #ifdef CONFIG_ACPI
245 #define ACPI_PROBE_TABLE(name) \
246 . = ALIGN(8); \
247 __##name##_acpi_probe_table = .; \
248 KEEP(*(__##name##_acpi_probe_table)) \
249 __##name##_acpi_probe_table_end = .;
250 #else
251 #define ACPI_PROBE_TABLE(name)
252 #endif
253
254 #ifdef CONFIG_THERMAL
255 #define THERMAL_TABLE(name) \
256 . = ALIGN(8); \
257 __##name##_thermal_table = .; \
258 KEEP(*(__##name##_thermal_table)) \
259 __##name##_thermal_table_end = .;
260 #else
261 #define THERMAL_TABLE(name)
262 #endif
263
264 #define KERNEL_DTB() \
265 STRUCT_ALIGN(); \
266 __dtb_start = .; \
267 KEEP(*(.dtb.init.rodata)) \
268 __dtb_end = .;
269
270 /*
271 * .data section
272 */
273 #define DATA_DATA \
274 *(.xiptext) \
275 *(DATA_MAIN) \
276 *(.ref.data) \
277 *(.data..shared_aligned) /* percpu related */ \
278 MEM_KEEP(init.data*) \
279 MEM_KEEP(exit.data*) \
280 *(.data.unlikely) \
281 __start_once = .; \
282 *(.data.once) \
283 __end_once = .; \
284 STRUCT_ALIGN(); \
285 *(__tracepoints) \
286 /* implement dynamic printk debug */ \
287 . = ALIGN(8); \
288 __start___verbose = .; \
289 KEEP(*(__verbose)) \
290 __stop___verbose = .; \
291 LIKELY_PROFILE() \
292 BRANCH_PROFILE() \
293 TRACE_PRINTKS() \
294 BPF_RAW_TP() \
295 TRACEPOINT_STR()
296
297 /*
298 * Data section helpers
299 */
300 #define NOSAVE_DATA \
301 . = ALIGN(PAGE_SIZE); \
302 __nosave_begin = .; \
303 *(.data..nosave) \
304 . = ALIGN(PAGE_SIZE); \
305 __nosave_end = .;
306
307 #define PAGE_ALIGNED_DATA(page_align) \
308 . = ALIGN(page_align); \
309 *(.data..page_aligned)
310
311 #define READ_MOSTLY_DATA(align) \
312 . = ALIGN(align); \
313 *(.data..read_mostly) \
314 . = ALIGN(align);
315
316 #define CACHELINE_ALIGNED_DATA(align) \
317 . = ALIGN(align); \
318 *(.data..cacheline_aligned)
319
320 #define INIT_TASK_DATA(align) \
321 . = ALIGN(align); \
322 __start_init_task = .; \
323 init_thread_union = .; \
324 init_stack = .; \
325 KEEP(*(.data..init_task)) \
326 KEEP(*(.data..init_thread_info)) \
327 . = __start_init_task + THREAD_SIZE; \
328 __end_init_task = .;
329
330 #define JUMP_TABLE_DATA \
331 . = ALIGN(8); \
332 __start___jump_table = .; \
333 KEEP(*(__jump_table)) \
334 __stop___jump_table = .;
335
336 /*
337 * Allow architectures to handle ro_after_init data on their
338 * own by defining an empty RO_AFTER_INIT_DATA.
339 */
340 #ifndef RO_AFTER_INIT_DATA
341 #define RO_AFTER_INIT_DATA \
342 __start_ro_after_init = .; \
343 *(.data..ro_after_init) \
344 JUMP_TABLE_DATA \
345 __end_ro_after_init = .;
346 #endif
347
348 /*
349 * Read only Data
350 */
351 #define RO_DATA_SECTION(align) \
352 . = ALIGN((align)); \
353 .rodata : AT(ADDR(.rodata) - LOAD_OFFSET) { \
354 __start_rodata = .; \
355 *(.rodata) *(.rodata.*) \
356 RO_AFTER_INIT_DATA /* Read only after init */ \
357 . = ALIGN(8); \
358 __start___tracepoints_ptrs = .; \
359 KEEP(*(__tracepoints_ptrs)) /* Tracepoints: pointer array */ \
360 __stop___tracepoints_ptrs = .; \
361 *(__tracepoints_strings)/* Tracepoints: strings */ \
362 } \
363 \
364 .rodata1 : AT(ADDR(.rodata1) - LOAD_OFFSET) { \
365 *(.rodata1) \
366 } \
367 \
368 /* PCI quirks */ \
369 .pci_fixup : AT(ADDR(.pci_fixup) - LOAD_OFFSET) { \
370 __start_pci_fixups_early = .; \
371 KEEP(*(.pci_fixup_early)) \
372 __end_pci_fixups_early = .; \
373 __start_pci_fixups_header = .; \
374 KEEP(*(.pci_fixup_header)) \
375 __end_pci_fixups_header = .; \
376 __start_pci_fixups_final = .; \
377 KEEP(*(.pci_fixup_final)) \
378 __end_pci_fixups_final = .; \
379 __start_pci_fixups_enable = .; \
380 KEEP(*(.pci_fixup_enable)) \
381 __end_pci_fixups_enable = .; \
382 __start_pci_fixups_resume = .; \
383 KEEP(*(.pci_fixup_resume)) \
384 __end_pci_fixups_resume = .; \
385 __start_pci_fixups_resume_early = .; \
386 KEEP(*(.pci_fixup_resume_early)) \
387 __end_pci_fixups_resume_early = .; \
388 __start_pci_fixups_suspend = .; \
389 KEEP(*(.pci_fixup_suspend)) \
390 __end_pci_fixups_suspend = .; \
391 __start_pci_fixups_suspend_late = .; \
392 KEEP(*(.pci_fixup_suspend_late)) \
393 __end_pci_fixups_suspend_late = .; \
394 } \
395 \
396 /* Built-in firmware blobs */ \
397 .builtin_fw : AT(ADDR(.builtin_fw) - LOAD_OFFSET) { \
398 __start_builtin_fw = .; \
399 KEEP(*(.builtin_fw)) \
400 __end_builtin_fw = .; \
401 } \
402 \
403 TRACEDATA \
404 \
405 /* Kernel symbol table: Normal symbols */ \
406 __ksymtab : AT(ADDR(__ksymtab) - LOAD_OFFSET) { \
407 __start___ksymtab = .; \
408 KEEP(*(SORT(___ksymtab+*))) \
409 __stop___ksymtab = .; \
410 } \
411 \
412 /* Kernel symbol table: GPL-only symbols */ \
413 __ksymtab_gpl : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) { \
414 __start___ksymtab_gpl = .; \
415 KEEP(*(SORT(___ksymtab_gpl+*))) \
416 __stop___ksymtab_gpl = .; \
417 } \
418 \
419 /* Kernel symbol table: Normal unused symbols */ \
420 __ksymtab_unused : AT(ADDR(__ksymtab_unused) - LOAD_OFFSET) { \
421 __start___ksymtab_unused = .; \
422 KEEP(*(SORT(___ksymtab_unused+*))) \
423 __stop___ksymtab_unused = .; \
424 } \
425 \
426 /* Kernel symbol table: GPL-only unused symbols */ \
427 __ksymtab_unused_gpl : AT(ADDR(__ksymtab_unused_gpl) - LOAD_OFFSET) { \
428 __start___ksymtab_unused_gpl = .; \
429 KEEP(*(SORT(___ksymtab_unused_gpl+*))) \
430 __stop___ksymtab_unused_gpl = .; \
431 } \
432 \
433 /* Kernel symbol table: GPL-future-only symbols */ \
434 __ksymtab_gpl_future : AT(ADDR(__ksymtab_gpl_future) - LOAD_OFFSET) { \
435 __start___ksymtab_gpl_future = .; \
436 KEEP(*(SORT(___ksymtab_gpl_future+*))) \
437 __stop___ksymtab_gpl_future = .; \
438 } \
439 \
440 /* Kernel symbol table: Normal symbols */ \
441 __kcrctab : AT(ADDR(__kcrctab) - LOAD_OFFSET) { \
442 __start___kcrctab = .; \
443 KEEP(*(SORT(___kcrctab+*))) \
444 __stop___kcrctab = .; \
445 } \
446 \
447 /* Kernel symbol table: GPL-only symbols */ \
448 __kcrctab_gpl : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) { \
449 __start___kcrctab_gpl = .; \
450 KEEP(*(SORT(___kcrctab_gpl+*))) \
451 __stop___kcrctab_gpl = .; \
452 } \
453 \
454 /* Kernel symbol table: Normal unused symbols */ \
455 __kcrctab_unused : AT(ADDR(__kcrctab_unused) - LOAD_OFFSET) { \
456 __start___kcrctab_unused = .; \
457 KEEP(*(SORT(___kcrctab_unused+*))) \
458 __stop___kcrctab_unused = .; \
459 } \
460 \
461 /* Kernel symbol table: GPL-only unused symbols */ \
462 __kcrctab_unused_gpl : AT(ADDR(__kcrctab_unused_gpl) - LOAD_OFFSET) { \
463 __start___kcrctab_unused_gpl = .; \
464 KEEP(*(SORT(___kcrctab_unused_gpl+*))) \
465 __stop___kcrctab_unused_gpl = .; \
466 } \
467 \
468 /* Kernel symbol table: GPL-future-only symbols */ \
469 __kcrctab_gpl_future : AT(ADDR(__kcrctab_gpl_future) - LOAD_OFFSET) { \
470 __start___kcrctab_gpl_future = .; \
471 KEEP(*(SORT(___kcrctab_gpl_future+*))) \
472 __stop___kcrctab_gpl_future = .; \
473 } \
474 \
475 /* Kernel symbol table: strings */ \
476 __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \
477 *(__ksymtab_strings) \
478 } \
479 \
480 /* __*init sections */ \
481 __init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) { \
482 *(.ref.rodata) \
483 MEM_KEEP(init.rodata) \
484 MEM_KEEP(exit.rodata) \
485 } \
486 \
487 /* Built-in module parameters. */ \
488 __param : AT(ADDR(__param) - LOAD_OFFSET) { \
489 __start___param = .; \
490 KEEP(*(__param)) \
491 __stop___param = .; \
492 } \
493 \
494 /* Built-in module versions. */ \
495 __modver : AT(ADDR(__modver) - LOAD_OFFSET) { \
496 __start___modver = .; \
497 KEEP(*(__modver)) \
498 __stop___modver = .; \
499 } \
500 \
501 BTF \
502 \
503 . = ALIGN((align)); \
504 __end_rodata = .;
505
506 /* RODATA & RO_DATA provided for backward compatibility.
507 * All archs are supposed to use RO_DATA() */
508 #define RODATA RO_DATA_SECTION(4096)
509 #define RO_DATA(align) RO_DATA_SECTION(align)
510
511 /*
512 * .text section. Map to function alignment to avoid address changes
513 * during second ld run in second ld pass when generating System.map
514 *
515 * TEXT_MAIN here will match .text.fixup and .text.unlikely if dead
516 * code elimination is enabled, so these sections should be converted
517 * to use ".." first.
518 */
519 #define TEXT_TEXT \
520 ALIGN_FUNCTION(); \
521 *(.text.hot TEXT_MAIN .text.fixup .text.unlikely) \
522 *(.text..refcount) \
523 *(.ref.text) \
524 MEM_KEEP(init.text*) \
525 MEM_KEEP(exit.text*) \
526
527
528 /* sched.text is aling to function alignment to secure we have same
529 * address even at second ld pass when generating System.map */
530 #define SCHED_TEXT \
531 ALIGN_FUNCTION(); \
532 __sched_text_start = .; \
533 *(.sched.text) \
534 __sched_text_end = .;
535
536 /* spinlock.text is aling to function alignment to secure we have same
537 * address even at second ld pass when generating System.map */
538 #define LOCK_TEXT \
539 ALIGN_FUNCTION(); \
540 __lock_text_start = .; \
541 *(.spinlock.text) \
542 __lock_text_end = .;
543
544 #define CPUIDLE_TEXT \
545 ALIGN_FUNCTION(); \
546 __cpuidle_text_start = .; \
547 *(.cpuidle.text) \
548 __cpuidle_text_end = .;
549
550 #define KPROBES_TEXT \
551 ALIGN_FUNCTION(); \
552 __kprobes_text_start = .; \
553 *(.kprobes.text) \
554 __kprobes_text_end = .;
555
556 #define ENTRY_TEXT \
557 ALIGN_FUNCTION(); \
558 __entry_text_start = .; \
559 *(.entry.text) \
560 __entry_text_end = .;
561
562 #define IRQENTRY_TEXT \
563 ALIGN_FUNCTION(); \
564 __irqentry_text_start = .; \
565 *(.irqentry.text) \
566 __irqentry_text_end = .;
567
568 #define SOFTIRQENTRY_TEXT \
569 ALIGN_FUNCTION(); \
570 __softirqentry_text_start = .; \
571 *(.softirqentry.text) \
572 __softirqentry_text_end = .;
573
574 /* Section used for early init (in .S files) */
575 #define HEAD_TEXT KEEP(*(.head.text))
576
577 #define HEAD_TEXT_SECTION \
578 .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) { \
579 HEAD_TEXT \
580 }
581
582 /*
583 * Exception table
584 */
585 #define EXCEPTION_TABLE(align) \
586 . = ALIGN(align); \
587 __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) { \
588 __start___ex_table = .; \
589 KEEP(*(__ex_table)) \
590 __stop___ex_table = .; \
591 }
592
593 /*
594 * .BTF
595 */
596 #ifdef CONFIG_DEBUG_INFO_BTF
597 #define BTF \
598 .BTF : AT(ADDR(.BTF) - LOAD_OFFSET) { \
599 __start_BTF = .; \
600 *(.BTF) \
601 __stop_BTF = .; \
602 }
603 #else
604 #define BTF
605 #endif
606
607 /*
608 * Init task
609 */
610 #define INIT_TASK_DATA_SECTION(align) \
611 . = ALIGN(align); \
612 .data..init_task : AT(ADDR(.data..init_task) - LOAD_OFFSET) { \
613 INIT_TASK_DATA(align) \
614 }
615
616 #ifdef CONFIG_CONSTRUCTORS
617 #define KERNEL_CTORS() . = ALIGN(8); \
618 __ctors_start = .; \
619 KEEP(*(.ctors)) \
620 KEEP(*(SORT(.init_array.*))) \
621 KEEP(*(.init_array)) \
622 __ctors_end = .;
623 #else
624 #define KERNEL_CTORS()
625 #endif
626
627 /* init and exit section handling */
628 #define INIT_DATA \
629 KEEP(*(SORT(___kentry+*))) \
630 *(.init.data init.data.*) \
631 MEM_DISCARD(init.data*) \
632 KERNEL_CTORS() \
633 MCOUNT_REC() \
634 *(.init.rodata .init.rodata.*) \
635 FTRACE_EVENTS() \
636 TRACE_SYSCALLS() \
637 KPROBE_BLACKLIST() \
638 ERROR_INJECT_WHITELIST() \
639 MEM_DISCARD(init.rodata) \
640 CLK_OF_TABLES() \
641 RESERVEDMEM_OF_TABLES() \
642 TIMER_OF_TABLES() \
643 CPU_METHOD_OF_TABLES() \
644 CPUIDLE_METHOD_OF_TABLES() \
645 KERNEL_DTB() \
646 IRQCHIP_OF_MATCH_TABLE() \
647 ACPI_PROBE_TABLE(irqchip) \
648 ACPI_PROBE_TABLE(timer) \
649 THERMAL_TABLE(governor) \
650 EARLYCON_TABLE() \
651 LSM_TABLE() \
652 EARLY_LSM_TABLE()
653
654 #define INIT_TEXT \
655 *(.init.text .init.text.*) \
656 *(.text.startup) \
657 MEM_DISCARD(init.text*)
658
659 #define EXIT_DATA \
660 *(.exit.data .exit.data.*) \
661 *(.fini_array .fini_array.*) \
662 *(.dtors .dtors.*) \
663 MEM_DISCARD(exit.data*) \
664 MEM_DISCARD(exit.rodata*)
665
666 #define EXIT_TEXT \
667 *(.exit.text) \
668 *(.text.exit) \
669 MEM_DISCARD(exit.text)
670
671 #define EXIT_CALL \
672 *(.exitcall.exit)
673
674 /*
675 * bss (Block Started by Symbol) - uninitialized data
676 * zeroed during startup
677 */
678 #define SBSS(sbss_align) \
679 . = ALIGN(sbss_align); \
680 .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) { \
681 *(.dynsbss) \
682 *(SBSS_MAIN) \
683 *(.scommon) \
684 }
685
686 /*
687 * Allow archectures to redefine BSS_FIRST_SECTIONS to add extra
688 * sections to the front of bss.
689 */
690 #ifndef BSS_FIRST_SECTIONS
691 #define BSS_FIRST_SECTIONS
692 #endif
693
694 #define BSS(bss_align) \
695 . = ALIGN(bss_align); \
696 .bss : AT(ADDR(.bss) - LOAD_OFFSET) { \
697 BSS_FIRST_SECTIONS \
698 *(.bss..page_aligned) \
699 *(.dynbss) \
700 *(BSS_MAIN) \
701 *(COMMON) \
702 }
703
704 /*
705 * DWARF debug sections.
706 * Symbols in the DWARF debugging sections are relative to
707 * the beginning of the section so we begin them at 0.
708 */
709 #define DWARF_DEBUG \
710 /* DWARF 1 */ \
711 .debug 0 : { *(.debug) } \
712 .line 0 : { *(.line) } \
713 /* GNU DWARF 1 extensions */ \
714 .debug_srcinfo 0 : { *(.debug_srcinfo) } \
715 .debug_sfnames 0 : { *(.debug_sfnames) } \
716 /* DWARF 1.1 and DWARF 2 */ \
717 .debug_aranges 0 : { *(.debug_aranges) } \
718 .debug_pubnames 0 : { *(.debug_pubnames) } \
719 /* DWARF 2 */ \
720 .debug_info 0 : { *(.debug_info \
721 .gnu.linkonce.wi.*) } \
722 .debug_abbrev 0 : { *(.debug_abbrev) } \
723 .debug_line 0 : { *(.debug_line) } \
724 .debug_frame 0 : { *(.debug_frame) } \
725 .debug_str 0 : { *(.debug_str) } \
726 .debug_loc 0 : { *(.debug_loc) } \
727 .debug_macinfo 0 : { *(.debug_macinfo) } \
728 .debug_pubtypes 0 : { *(.debug_pubtypes) } \
729 /* DWARF 3 */ \
730 .debug_ranges 0 : { *(.debug_ranges) } \
731 /* SGI/MIPS DWARF 2 extensions */ \
732 .debug_weaknames 0 : { *(.debug_weaknames) } \
733 .debug_funcnames 0 : { *(.debug_funcnames) } \
734 .debug_typenames 0 : { *(.debug_typenames) } \
735 .debug_varnames 0 : { *(.debug_varnames) } \
736 /* GNU DWARF 2 extensions */ \
737 .debug_gnu_pubnames 0 : { *(.debug_gnu_pubnames) } \
738 .debug_gnu_pubtypes 0 : { *(.debug_gnu_pubtypes) } \
739 /* DWARF 4 */ \
740 .debug_types 0 : { *(.debug_types) } \
741 /* DWARF 5 */ \
742 .debug_macro 0 : { *(.debug_macro) } \
743 .debug_addr 0 : { *(.debug_addr) }
744
745 /* Stabs debugging sections. */
746 #define STABS_DEBUG \
747 .stab 0 : { *(.stab) } \
748 .stabstr 0 : { *(.stabstr) } \
749 .stab.excl 0 : { *(.stab.excl) } \
750 .stab.exclstr 0 : { *(.stab.exclstr) } \
751 .stab.index 0 : { *(.stab.index) } \
752 .stab.indexstr 0 : { *(.stab.indexstr) } \
753 .comment 0 : { *(.comment) }
754
755 #ifdef CONFIG_GENERIC_BUG
756 #define BUG_TABLE \
757 . = ALIGN(8); \
758 __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) { \
759 __start___bug_table = .; \
760 KEEP(*(__bug_table)) \
761 __stop___bug_table = .; \
762 }
763 #else
764 #define BUG_TABLE
765 #endif
766
767 #ifdef CONFIG_UNWINDER_ORC
768 #define ORC_UNWIND_TABLE \
769 . = ALIGN(4); \
770 .orc_unwind_ip : AT(ADDR(.orc_unwind_ip) - LOAD_OFFSET) { \
771 __start_orc_unwind_ip = .; \
772 KEEP(*(.orc_unwind_ip)) \
773 __stop_orc_unwind_ip = .; \
774 } \
775 . = ALIGN(2); \
776 .orc_unwind : AT(ADDR(.orc_unwind) - LOAD_OFFSET) { \
777 __start_orc_unwind = .; \
778 KEEP(*(.orc_unwind)) \
779 __stop_orc_unwind = .; \
780 } \
781 . = ALIGN(4); \
782 .orc_lookup : AT(ADDR(.orc_lookup) - LOAD_OFFSET) { \
783 orc_lookup = .; \
784 . += (((SIZEOF(.text) + LOOKUP_BLOCK_SIZE - 1) / \
785 LOOKUP_BLOCK_SIZE) + 1) * 4; \
786 orc_lookup_end = .; \
787 }
788 #else
789 #define ORC_UNWIND_TABLE
790 #endif
791
792 #ifdef CONFIG_PM_TRACE
793 #define TRACEDATA \
794 . = ALIGN(4); \
795 .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) { \
796 __tracedata_start = .; \
797 KEEP(*(.tracedata)) \
798 __tracedata_end = .; \
799 }
800 #else
801 #define TRACEDATA
802 #endif
803
804 #define NOTES \
805 .notes : AT(ADDR(.notes) - LOAD_OFFSET) { \
806 __start_notes = .; \
807 KEEP(*(.note.*)) \
808 __stop_notes = .; \
809 }
810
811 #define INIT_SETUP(initsetup_align) \
812 . = ALIGN(initsetup_align); \
813 __setup_start = .; \
814 KEEP(*(.init.setup)) \
815 __setup_end = .;
816
817 #define INIT_CALLS_LEVEL(level) \
818 __initcall##level##_start = .; \
819 KEEP(*(.initcall##level##.init)) \
820 KEEP(*(.initcall##level##s.init)) \
821
822 #define INIT_CALLS \
823 __initcall_start = .; \
824 KEEP(*(.initcallearly.init)) \
825 INIT_CALLS_LEVEL(0) \
826 INIT_CALLS_LEVEL(1) \
827 INIT_CALLS_LEVEL(2) \
828 INIT_CALLS_LEVEL(3) \
829 INIT_CALLS_LEVEL(4) \
830 INIT_CALLS_LEVEL(5) \
831 INIT_CALLS_LEVEL(rootfs) \
832 INIT_CALLS_LEVEL(6) \
833 INIT_CALLS_LEVEL(7) \
834 __initcall_end = .;
835
836 #define CON_INITCALL \
837 __con_initcall_start = .; \
838 KEEP(*(.con_initcall.init)) \
839 __con_initcall_end = .;
840
841 #ifdef CONFIG_BLK_DEV_INITRD
842 #define INIT_RAM_FS \
843 . = ALIGN(4); \
844 __initramfs_start = .; \
845 KEEP(*(.init.ramfs)) \
846 . = ALIGN(8); \
847 KEEP(*(.init.ramfs.info))
848 #else
849 #define INIT_RAM_FS
850 #endif
851
852 /*
853 * Memory encryption operates on a page basis. Since we need to clear
854 * the memory encryption mask for this section, it needs to be aligned
855 * on a page boundary and be a page-size multiple in length.
856 *
857 * Note: We use a separate section so that only this section gets
858 * decrypted to avoid exposing more than we wish.
859 */
860 #ifdef CONFIG_AMD_MEM_ENCRYPT
861 #define PERCPU_DECRYPTED_SECTION \
862 . = ALIGN(PAGE_SIZE); \
863 *(.data..percpu..decrypted) \
864 . = ALIGN(PAGE_SIZE);
865 #else
866 #define PERCPU_DECRYPTED_SECTION
867 #endif
868
869
870 /*
871 * Default discarded sections.
872 *
873 * Some archs want to discard exit text/data at runtime rather than
874 * link time due to cross-section references such as alt instructions,
875 * bug table, eh_frame, etc. DISCARDS must be the last of output
876 * section definitions so that such archs put those in earlier section
877 * definitions.
878 */
879 #define DISCARDS \
880 /DISCARD/ : { \
881 EXIT_TEXT \
882 EXIT_DATA \
883 EXIT_CALL \
884 *(.discard) \
885 *(.discard.*) \
886 *(.modinfo) \
887 }
888
889 /**
890 * PERCPU_INPUT - the percpu input sections
891 * @cacheline: cacheline size
892 *
893 * The core percpu section names and core symbols which do not rely
894 * directly upon load addresses.
895 *
896 * @cacheline is used to align subsections to avoid false cacheline
897 * sharing between subsections for different purposes.
898 */
899 #define PERCPU_INPUT(cacheline) \
900 __per_cpu_start = .; \
901 *(.data..percpu..first) \
902 . = ALIGN(PAGE_SIZE); \
903 *(.data..percpu..page_aligned) \
904 . = ALIGN(cacheline); \
905 *(.data..percpu..read_mostly) \
906 . = ALIGN(cacheline); \
907 *(.data..percpu) \
908 *(.data..percpu..shared_aligned) \
909 PERCPU_DECRYPTED_SECTION \
910 __per_cpu_end = .;
911
912 /**
913 * PERCPU_VADDR - define output section for percpu area
914 * @cacheline: cacheline size
915 * @vaddr: explicit base address (optional)
916 * @phdr: destination PHDR (optional)
917 *
918 * Macro which expands to output section for percpu area.
919 *
920 * @cacheline is used to align subsections to avoid false cacheline
921 * sharing between subsections for different purposes.
922 *
923 * If @vaddr is not blank, it specifies explicit base address and all
924 * percpu symbols will be offset from the given address. If blank,
925 * @vaddr always equals @laddr + LOAD_OFFSET.
926 *
927 * @phdr defines the output PHDR to use if not blank. Be warned that
928 * output PHDR is sticky. If @phdr is specified, the next output
929 * section in the linker script will go there too. @phdr should have
930 * a leading colon.
931 *
932 * Note that this macros defines __per_cpu_load as an absolute symbol.
933 * If there is no need to put the percpu section at a predetermined
934 * address, use PERCPU_SECTION.
935 */
936 #define PERCPU_VADDR(cacheline, vaddr, phdr) \
937 __per_cpu_load = .; \
938 .data..percpu vaddr : AT(__per_cpu_load - LOAD_OFFSET) { \
939 PERCPU_INPUT(cacheline) \
940 } phdr \
941 . = __per_cpu_load + SIZEOF(.data..percpu);
942
943 /**
944 * PERCPU_SECTION - define output section for percpu area, simple version
945 * @cacheline: cacheline size
946 *
947 * Align to PAGE_SIZE and outputs output section for percpu area. This
948 * macro doesn't manipulate @vaddr or @phdr and __per_cpu_load and
949 * __per_cpu_start will be identical.
950 *
951 * This macro is equivalent to ALIGN(PAGE_SIZE); PERCPU_VADDR(@cacheline,,)
952 * except that __per_cpu_load is defined as a relative symbol against
953 * .data..percpu which is required for relocatable x86_32 configuration.
954 */
955 #define PERCPU_SECTION(cacheline) \
956 . = ALIGN(PAGE_SIZE); \
957 .data..percpu : AT(ADDR(.data..percpu) - LOAD_OFFSET) { \
958 __per_cpu_load = .; \
959 PERCPU_INPUT(cacheline) \
960 }
961
962
963 /*
964 * Definition of the high level *_SECTION macros
965 * They will fit only a subset of the architectures
966 */
967
968
969 /*
970 * Writeable data.
971 * All sections are combined in a single .data section.
972 * The sections following CONSTRUCTORS are arranged so their
973 * typical alignment matches.
974 * A cacheline is typical/always less than a PAGE_SIZE so
975 * the sections that has this restriction (or similar)
976 * is located before the ones requiring PAGE_SIZE alignment.
977 * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which
978 * matches the requirement of PAGE_ALIGNED_DATA.
979 *
980 * use 0 as page_align if page_aligned data is not used */
981 #define RW_DATA_SECTION(cacheline, pagealigned, inittask) \
982 . = ALIGN(PAGE_SIZE); \
983 .data : AT(ADDR(.data) - LOAD_OFFSET) { \
984 INIT_TASK_DATA(inittask) \
985 NOSAVE_DATA \
986 PAGE_ALIGNED_DATA(pagealigned) \
987 CACHELINE_ALIGNED_DATA(cacheline) \
988 READ_MOSTLY_DATA(cacheline) \
989 DATA_DATA \
990 CONSTRUCTORS \
991 } \
992 BUG_TABLE \
993
994 #define INIT_TEXT_SECTION(inittext_align) \
995 . = ALIGN(inittext_align); \
996 .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) { \
997 _sinittext = .; \
998 INIT_TEXT \
999 _einittext = .; \
1000 }
1001
1002 #define INIT_DATA_SECTION(initsetup_align) \
1003 .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) { \
1004 INIT_DATA \
1005 INIT_SETUP(initsetup_align) \
1006 INIT_CALLS \
1007 CON_INITCALL \
1008 INIT_RAM_FS \
1009 }
1010
1011 #define BSS_SECTION(sbss_align, bss_align, stop_align) \
1012 . = ALIGN(sbss_align); \
1013 __bss_start = .; \
1014 SBSS(sbss_align) \
1015 BSS(bss_align) \
1016 . = ALIGN(stop_align); \
1017 __bss_stop = .;