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static_call: Add inline static call infrastructure
[mirror_ubuntu-jammy-kernel.git] / include / asm-generic / vmlinux.lds.h
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(PAGE_SIZE)
27 * RW_DATA(...)
28 * _edata = .;
29 *
30 * EXCEPTION_TABLE(...)
31 *
32 * BSS_SECTION(0, 0, 0)
33 * _end = .;
34 *
35 * STABS_DEBUG
36 * DWARF_DEBUG
37 *
38 * DISCARDS // must be the last
39 * }
40 *
41 * [__init_begin, __init_end] is the init section that may be freed after init
42 * // __init_begin and __init_end should be page aligned, so that we can
43 * // free the whole .init memory
44 * [_stext, _etext] is the text section
45 * [_sdata, _edata] is the data section
46 *
47 * Some of the included output section have their own set of constants.
48 * Examples are: [__initramfs_start, __initramfs_end] for initramfs and
49 * [__nosave_begin, __nosave_end] for the nosave data
50 */
51
52 #ifndef LOAD_OFFSET
53 #define LOAD_OFFSET 0
54 #endif
55
56 /*
57 * Only some architectures want to have the .notes segment visible in
58 * a separate PT_NOTE ELF Program Header. When this happens, it needs
59 * to be visible in both the kernel text's PT_LOAD and the PT_NOTE
60 * Program Headers. In this case, though, the PT_LOAD needs to be made
61 * the default again so that all the following sections don't also end
62 * up in the PT_NOTE Program Header.
63 */
64 #ifdef EMITS_PT_NOTE
65 #define NOTES_HEADERS :text :note
66 #define NOTES_HEADERS_RESTORE __restore_ph : { *(.__restore_ph) } :text
67 #else
68 #define NOTES_HEADERS
69 #define NOTES_HEADERS_RESTORE
70 #endif
71
72 /*
73 * Some architectures have non-executable read-only exception tables.
74 * They can be added to the RO_DATA segment by specifying their desired
75 * alignment.
76 */
77 #ifdef RO_EXCEPTION_TABLE_ALIGN
78 #define RO_EXCEPTION_TABLE EXCEPTION_TABLE(RO_EXCEPTION_TABLE_ALIGN)
79 #else
80 #define RO_EXCEPTION_TABLE
81 #endif
82
83 /* Align . to a 8 byte boundary equals to maximum function alignment. */
84 #define ALIGN_FUNCTION() . = ALIGN(8)
85
86 /*
87 * LD_DEAD_CODE_DATA_ELIMINATION option enables -fdata-sections, which
88 * generates .data.identifier sections, which need to be pulled in with
89 * .data. We don't want to pull in .data..other sections, which Linux
90 * has defined. Same for text and bss.
91 *
92 * RODATA_MAIN is not used because existing code already defines .rodata.x
93 * sections to be brought in with rodata.
94 */
95 #ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
96 #define TEXT_MAIN .text .text.[0-9a-zA-Z_]*
97 #define DATA_MAIN .data .data.[0-9a-zA-Z_]* .data..LPBX*
98 #define SDATA_MAIN .sdata .sdata.[0-9a-zA-Z_]*
99 #define RODATA_MAIN .rodata .rodata.[0-9a-zA-Z_]*
100 #define BSS_MAIN .bss .bss.[0-9a-zA-Z_]*
101 #define SBSS_MAIN .sbss .sbss.[0-9a-zA-Z_]*
102 #else
103 #define TEXT_MAIN .text
104 #define DATA_MAIN .data
105 #define SDATA_MAIN .sdata
106 #define RODATA_MAIN .rodata
107 #define BSS_MAIN .bss
108 #define SBSS_MAIN .sbss
109 #endif
110
111 /*
112 * GCC 4.5 and later have a 32 bytes section alignment for structures.
113 * Except GCC 4.9, that feels the need to align on 64 bytes.
114 */
115 #if __GNUC__ == 4 && __GNUC_MINOR__ == 9
116 #define STRUCT_ALIGNMENT 64
117 #else
118 #define STRUCT_ALIGNMENT 32
119 #endif
120 #define STRUCT_ALIGN() . = ALIGN(STRUCT_ALIGNMENT)
121
122 /*
123 * The order of the sched class addresses are important, as they are
124 * used to determine the order of the priority of each sched class in
125 * relation to each other.
126 */
127 #define SCHED_DATA \
128 STRUCT_ALIGN(); \
129 __begin_sched_classes = .; \
130 *(__idle_sched_class) \
131 *(__fair_sched_class) \
132 *(__rt_sched_class) \
133 *(__dl_sched_class) \
134 *(__stop_sched_class) \
135 __end_sched_classes = .;
136
137 /* The actual configuration determine if the init/exit sections
138 * are handled as text/data or they can be discarded (which
139 * often happens at runtime)
140 */
141 #ifdef CONFIG_HOTPLUG_CPU
142 #define CPU_KEEP(sec) *(.cpu##sec)
143 #define CPU_DISCARD(sec)
144 #else
145 #define CPU_KEEP(sec)
146 #define CPU_DISCARD(sec) *(.cpu##sec)
147 #endif
148
149 #if defined(CONFIG_MEMORY_HOTPLUG)
150 #define MEM_KEEP(sec) *(.mem##sec)
151 #define MEM_DISCARD(sec)
152 #else
153 #define MEM_KEEP(sec)
154 #define MEM_DISCARD(sec) *(.mem##sec)
155 #endif
156
157 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
158 /*
159 * The ftrace call sites are logged to a section whose name depends on the
160 * compiler option used. A given kernel image will only use one, AKA
161 * FTRACE_CALLSITE_SECTION. We capture all of them here to avoid header
162 * dependencies for FTRACE_CALLSITE_SECTION's definition.
163 *
164 * Need to also make ftrace_stub_graph point to ftrace_stub
165 * so that the same stub location may have different protocols
166 * and not mess up with C verifiers.
167 */
168 #define MCOUNT_REC() . = ALIGN(8); \
169 __start_mcount_loc = .; \
170 KEEP(*(__mcount_loc)) \
171 KEEP(*(__patchable_function_entries)) \
172 __stop_mcount_loc = .; \
173 ftrace_stub_graph = ftrace_stub;
174 #else
175 # ifdef CONFIG_FUNCTION_TRACER
176 # define MCOUNT_REC() ftrace_stub_graph = ftrace_stub;
177 # else
178 # define MCOUNT_REC()
179 # endif
180 #endif
181
182 #ifdef CONFIG_TRACE_BRANCH_PROFILING
183 #define LIKELY_PROFILE() __start_annotated_branch_profile = .; \
184 KEEP(*(_ftrace_annotated_branch)) \
185 __stop_annotated_branch_profile = .;
186 #else
187 #define LIKELY_PROFILE()
188 #endif
189
190 #ifdef CONFIG_PROFILE_ALL_BRANCHES
191 #define BRANCH_PROFILE() __start_branch_profile = .; \
192 KEEP(*(_ftrace_branch)) \
193 __stop_branch_profile = .;
194 #else
195 #define BRANCH_PROFILE()
196 #endif
197
198 #ifdef CONFIG_KPROBES
199 #define KPROBE_BLACKLIST() . = ALIGN(8); \
200 __start_kprobe_blacklist = .; \
201 KEEP(*(_kprobe_blacklist)) \
202 __stop_kprobe_blacklist = .;
203 #else
204 #define KPROBE_BLACKLIST()
205 #endif
206
207 #ifdef CONFIG_FUNCTION_ERROR_INJECTION
208 #define ERROR_INJECT_WHITELIST() STRUCT_ALIGN(); \
209 __start_error_injection_whitelist = .; \
210 KEEP(*(_error_injection_whitelist)) \
211 __stop_error_injection_whitelist = .;
212 #else
213 #define ERROR_INJECT_WHITELIST()
214 #endif
215
216 #ifdef CONFIG_EVENT_TRACING
217 #define FTRACE_EVENTS() . = ALIGN(8); \
218 __start_ftrace_events = .; \
219 KEEP(*(_ftrace_events)) \
220 __stop_ftrace_events = .; \
221 __start_ftrace_eval_maps = .; \
222 KEEP(*(_ftrace_eval_map)) \
223 __stop_ftrace_eval_maps = .;
224 #else
225 #define FTRACE_EVENTS()
226 #endif
227
228 #ifdef CONFIG_TRACING
229 #define TRACE_PRINTKS() __start___trace_bprintk_fmt = .; \
230 KEEP(*(__trace_printk_fmt)) /* Trace_printk fmt' pointer */ \
231 __stop___trace_bprintk_fmt = .;
232 #define TRACEPOINT_STR() __start___tracepoint_str = .; \
233 KEEP(*(__tracepoint_str)) /* Trace_printk fmt' pointer */ \
234 __stop___tracepoint_str = .;
235 #else
236 #define TRACE_PRINTKS()
237 #define TRACEPOINT_STR()
238 #endif
239
240 #ifdef CONFIG_FTRACE_SYSCALLS
241 #define TRACE_SYSCALLS() . = ALIGN(8); \
242 __start_syscalls_metadata = .; \
243 KEEP(*(__syscalls_metadata)) \
244 __stop_syscalls_metadata = .;
245 #else
246 #define TRACE_SYSCALLS()
247 #endif
248
249 #ifdef CONFIG_BPF_EVENTS
250 #define BPF_RAW_TP() STRUCT_ALIGN(); \
251 __start__bpf_raw_tp = .; \
252 KEEP(*(__bpf_raw_tp_map)) \
253 __stop__bpf_raw_tp = .;
254 #else
255 #define BPF_RAW_TP()
256 #endif
257
258 #ifdef CONFIG_SERIAL_EARLYCON
259 #define EARLYCON_TABLE() . = ALIGN(8); \
260 __earlycon_table = .; \
261 KEEP(*(__earlycon_table)) \
262 __earlycon_table_end = .;
263 #else
264 #define EARLYCON_TABLE()
265 #endif
266
267 #ifdef CONFIG_SECURITY
268 #define LSM_TABLE() . = ALIGN(8); \
269 __start_lsm_info = .; \
270 KEEP(*(.lsm_info.init)) \
271 __end_lsm_info = .;
272 #define EARLY_LSM_TABLE() . = ALIGN(8); \
273 __start_early_lsm_info = .; \
274 KEEP(*(.early_lsm_info.init)) \
275 __end_early_lsm_info = .;
276 #else
277 #define LSM_TABLE()
278 #define EARLY_LSM_TABLE()
279 #endif
280
281 #define ___OF_TABLE(cfg, name) _OF_TABLE_##cfg(name)
282 #define __OF_TABLE(cfg, name) ___OF_TABLE(cfg, name)
283 #define OF_TABLE(cfg, name) __OF_TABLE(IS_ENABLED(cfg), name)
284 #define _OF_TABLE_0(name)
285 #define _OF_TABLE_1(name) \
286 . = ALIGN(8); \
287 __##name##_of_table = .; \
288 KEEP(*(__##name##_of_table)) \
289 KEEP(*(__##name##_of_table_end))
290
291 #define TIMER_OF_TABLES() OF_TABLE(CONFIG_TIMER_OF, timer)
292 #define IRQCHIP_OF_MATCH_TABLE() OF_TABLE(CONFIG_IRQCHIP, irqchip)
293 #define CLK_OF_TABLES() OF_TABLE(CONFIG_COMMON_CLK, clk)
294 #define RESERVEDMEM_OF_TABLES() OF_TABLE(CONFIG_OF_RESERVED_MEM, reservedmem)
295 #define CPU_METHOD_OF_TABLES() OF_TABLE(CONFIG_SMP, cpu_method)
296 #define CPUIDLE_METHOD_OF_TABLES() OF_TABLE(CONFIG_CPU_IDLE, cpuidle_method)
297
298 #ifdef CONFIG_ACPI
299 #define ACPI_PROBE_TABLE(name) \
300 . = ALIGN(8); \
301 __##name##_acpi_probe_table = .; \
302 KEEP(*(__##name##_acpi_probe_table)) \
303 __##name##_acpi_probe_table_end = .;
304 #else
305 #define ACPI_PROBE_TABLE(name)
306 #endif
307
308 #ifdef CONFIG_THERMAL
309 #define THERMAL_TABLE(name) \
310 . = ALIGN(8); \
311 __##name##_thermal_table = .; \
312 KEEP(*(__##name##_thermal_table)) \
313 __##name##_thermal_table_end = .;
314 #else
315 #define THERMAL_TABLE(name)
316 #endif
317
318 #define KERNEL_DTB() \
319 STRUCT_ALIGN(); \
320 __dtb_start = .; \
321 KEEP(*(.dtb.init.rodata)) \
322 __dtb_end = .;
323
324 /*
325 * .data section
326 */
327 #define DATA_DATA \
328 *(.xiptext) \
329 *(DATA_MAIN) \
330 *(.ref.data) \
331 *(.data..shared_aligned) /* percpu related */ \
332 MEM_KEEP(init.data*) \
333 MEM_KEEP(exit.data*) \
334 *(.data.unlikely) \
335 __start_once = .; \
336 *(.data.once) \
337 __end_once = .; \
338 STRUCT_ALIGN(); \
339 *(__tracepoints) \
340 /* implement dynamic printk debug */ \
341 . = ALIGN(8); \
342 __start___dyndbg = .; \
343 KEEP(*(__dyndbg)) \
344 __stop___dyndbg = .; \
345 LIKELY_PROFILE() \
346 BRANCH_PROFILE() \
347 TRACE_PRINTKS() \
348 BPF_RAW_TP() \
349 TRACEPOINT_STR()
350
351 /*
352 * Data section helpers
353 */
354 #define NOSAVE_DATA \
355 . = ALIGN(PAGE_SIZE); \
356 __nosave_begin = .; \
357 *(.data..nosave) \
358 . = ALIGN(PAGE_SIZE); \
359 __nosave_end = .;
360
361 #define PAGE_ALIGNED_DATA(page_align) \
362 . = ALIGN(page_align); \
363 *(.data..page_aligned) \
364 . = ALIGN(page_align);
365
366 #define READ_MOSTLY_DATA(align) \
367 . = ALIGN(align); \
368 *(.data..read_mostly) \
369 . = ALIGN(align);
370
371 #define CACHELINE_ALIGNED_DATA(align) \
372 . = ALIGN(align); \
373 *(.data..cacheline_aligned)
374
375 #define INIT_TASK_DATA(align) \
376 . = ALIGN(align); \
377 __start_init_task = .; \
378 init_thread_union = .; \
379 init_stack = .; \
380 KEEP(*(.data..init_task)) \
381 KEEP(*(.data..init_thread_info)) \
382 . = __start_init_task + THREAD_SIZE; \
383 __end_init_task = .;
384
385 #define JUMP_TABLE_DATA \
386 . = ALIGN(8); \
387 __start___jump_table = .; \
388 KEEP(*(__jump_table)) \
389 __stop___jump_table = .;
390
391 #define STATIC_CALL_DATA \
392 . = ALIGN(8); \
393 __start_static_call_sites = .; \
394 KEEP(*(.static_call_sites)) \
395 __stop_static_call_sites = .;
396
397 /*
398 * Allow architectures to handle ro_after_init data on their
399 * own by defining an empty RO_AFTER_INIT_DATA.
400 */
401 #ifndef RO_AFTER_INIT_DATA
402 #define RO_AFTER_INIT_DATA \
403 . = ALIGN(8); \
404 __start_ro_after_init = .; \
405 *(.data..ro_after_init) \
406 JUMP_TABLE_DATA \
407 STATIC_CALL_DATA \
408 __end_ro_after_init = .;
409 #endif
410
411 /*
412 * Read only Data
413 */
414 #define RO_DATA(align) \
415 . = ALIGN((align)); \
416 .rodata : AT(ADDR(.rodata) - LOAD_OFFSET) { \
417 __start_rodata = .; \
418 *(.rodata) *(.rodata.*) \
419 SCHED_DATA \
420 RO_AFTER_INIT_DATA /* Read only after init */ \
421 . = ALIGN(8); \
422 __start___tracepoints_ptrs = .; \
423 KEEP(*(__tracepoints_ptrs)) /* Tracepoints: pointer array */ \
424 __stop___tracepoints_ptrs = .; \
425 *(__tracepoints_strings)/* Tracepoints: strings */ \
426 } \
427 \
428 .rodata1 : AT(ADDR(.rodata1) - LOAD_OFFSET) { \
429 *(.rodata1) \
430 } \
431 \
432 /* PCI quirks */ \
433 .pci_fixup : AT(ADDR(.pci_fixup) - LOAD_OFFSET) { \
434 __start_pci_fixups_early = .; \
435 KEEP(*(.pci_fixup_early)) \
436 __end_pci_fixups_early = .; \
437 __start_pci_fixups_header = .; \
438 KEEP(*(.pci_fixup_header)) \
439 __end_pci_fixups_header = .; \
440 __start_pci_fixups_final = .; \
441 KEEP(*(.pci_fixup_final)) \
442 __end_pci_fixups_final = .; \
443 __start_pci_fixups_enable = .; \
444 KEEP(*(.pci_fixup_enable)) \
445 __end_pci_fixups_enable = .; \
446 __start_pci_fixups_resume = .; \
447 KEEP(*(.pci_fixup_resume)) \
448 __end_pci_fixups_resume = .; \
449 __start_pci_fixups_resume_early = .; \
450 KEEP(*(.pci_fixup_resume_early)) \
451 __end_pci_fixups_resume_early = .; \
452 __start_pci_fixups_suspend = .; \
453 KEEP(*(.pci_fixup_suspend)) \
454 __end_pci_fixups_suspend = .; \
455 __start_pci_fixups_suspend_late = .; \
456 KEEP(*(.pci_fixup_suspend_late)) \
457 __end_pci_fixups_suspend_late = .; \
458 } \
459 \
460 /* Built-in firmware blobs */ \
461 .builtin_fw : AT(ADDR(.builtin_fw) - LOAD_OFFSET) { \
462 __start_builtin_fw = .; \
463 KEEP(*(.builtin_fw)) \
464 __end_builtin_fw = .; \
465 } \
466 \
467 TRACEDATA \
468 \
469 /* Kernel symbol table: Normal symbols */ \
470 __ksymtab : AT(ADDR(__ksymtab) - LOAD_OFFSET) { \
471 __start___ksymtab = .; \
472 KEEP(*(SORT(___ksymtab+*))) \
473 __stop___ksymtab = .; \
474 } \
475 \
476 /* Kernel symbol table: GPL-only symbols */ \
477 __ksymtab_gpl : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) { \
478 __start___ksymtab_gpl = .; \
479 KEEP(*(SORT(___ksymtab_gpl+*))) \
480 __stop___ksymtab_gpl = .; \
481 } \
482 \
483 /* Kernel symbol table: Normal unused symbols */ \
484 __ksymtab_unused : AT(ADDR(__ksymtab_unused) - LOAD_OFFSET) { \
485 __start___ksymtab_unused = .; \
486 KEEP(*(SORT(___ksymtab_unused+*))) \
487 __stop___ksymtab_unused = .; \
488 } \
489 \
490 /* Kernel symbol table: GPL-only unused symbols */ \
491 __ksymtab_unused_gpl : AT(ADDR(__ksymtab_unused_gpl) - LOAD_OFFSET) { \
492 __start___ksymtab_unused_gpl = .; \
493 KEEP(*(SORT(___ksymtab_unused_gpl+*))) \
494 __stop___ksymtab_unused_gpl = .; \
495 } \
496 \
497 /* Kernel symbol table: GPL-future-only symbols */ \
498 __ksymtab_gpl_future : AT(ADDR(__ksymtab_gpl_future) - LOAD_OFFSET) { \
499 __start___ksymtab_gpl_future = .; \
500 KEEP(*(SORT(___ksymtab_gpl_future+*))) \
501 __stop___ksymtab_gpl_future = .; \
502 } \
503 \
504 /* Kernel symbol table: Normal symbols */ \
505 __kcrctab : AT(ADDR(__kcrctab) - LOAD_OFFSET) { \
506 __start___kcrctab = .; \
507 KEEP(*(SORT(___kcrctab+*))) \
508 __stop___kcrctab = .; \
509 } \
510 \
511 /* Kernel symbol table: GPL-only symbols */ \
512 __kcrctab_gpl : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) { \
513 __start___kcrctab_gpl = .; \
514 KEEP(*(SORT(___kcrctab_gpl+*))) \
515 __stop___kcrctab_gpl = .; \
516 } \
517 \
518 /* Kernel symbol table: Normal unused symbols */ \
519 __kcrctab_unused : AT(ADDR(__kcrctab_unused) - LOAD_OFFSET) { \
520 __start___kcrctab_unused = .; \
521 KEEP(*(SORT(___kcrctab_unused+*))) \
522 __stop___kcrctab_unused = .; \
523 } \
524 \
525 /* Kernel symbol table: GPL-only unused symbols */ \
526 __kcrctab_unused_gpl : AT(ADDR(__kcrctab_unused_gpl) - LOAD_OFFSET) { \
527 __start___kcrctab_unused_gpl = .; \
528 KEEP(*(SORT(___kcrctab_unused_gpl+*))) \
529 __stop___kcrctab_unused_gpl = .; \
530 } \
531 \
532 /* Kernel symbol table: GPL-future-only symbols */ \
533 __kcrctab_gpl_future : AT(ADDR(__kcrctab_gpl_future) - LOAD_OFFSET) { \
534 __start___kcrctab_gpl_future = .; \
535 KEEP(*(SORT(___kcrctab_gpl_future+*))) \
536 __stop___kcrctab_gpl_future = .; \
537 } \
538 \
539 /* Kernel symbol table: strings */ \
540 __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \
541 *(__ksymtab_strings) \
542 } \
543 \
544 /* __*init sections */ \
545 __init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) { \
546 *(.ref.rodata) \
547 MEM_KEEP(init.rodata) \
548 MEM_KEEP(exit.rodata) \
549 } \
550 \
551 /* Built-in module parameters. */ \
552 __param : AT(ADDR(__param) - LOAD_OFFSET) { \
553 __start___param = .; \
554 KEEP(*(__param)) \
555 __stop___param = .; \
556 } \
557 \
558 /* Built-in module versions. */ \
559 __modver : AT(ADDR(__modver) - LOAD_OFFSET) { \
560 __start___modver = .; \
561 KEEP(*(__modver)) \
562 __stop___modver = .; \
563 } \
564 \
565 RO_EXCEPTION_TABLE \
566 NOTES \
567 BTF \
568 \
569 . = ALIGN((align)); \
570 __end_rodata = .;
571
572 /*
573 * Non-instrumentable text section
574 */
575 #define NOINSTR_TEXT \
576 ALIGN_FUNCTION(); \
577 __noinstr_text_start = .; \
578 *(.noinstr.text) \
579 __noinstr_text_end = .;
580
581 /*
582 * .text section. Map to function alignment to avoid address changes
583 * during second ld run in second ld pass when generating System.map
584 *
585 * TEXT_MAIN here will match .text.fixup and .text.unlikely if dead
586 * code elimination is enabled, so these sections should be converted
587 * to use ".." first.
588 */
589 #define TEXT_TEXT \
590 ALIGN_FUNCTION(); \
591 *(.text.hot TEXT_MAIN .text.fixup .text.unlikely) \
592 NOINSTR_TEXT \
593 *(.text..refcount) \
594 *(.ref.text) \
595 MEM_KEEP(init.text*) \
596 MEM_KEEP(exit.text*) \
597
598
599 /* sched.text is aling to function alignment to secure we have same
600 * address even at second ld pass when generating System.map */
601 #define SCHED_TEXT \
602 ALIGN_FUNCTION(); \
603 __sched_text_start = .; \
604 *(.sched.text) \
605 __sched_text_end = .;
606
607 /* spinlock.text is aling to function alignment to secure we have same
608 * address even at second ld pass when generating System.map */
609 #define LOCK_TEXT \
610 ALIGN_FUNCTION(); \
611 __lock_text_start = .; \
612 *(.spinlock.text) \
613 __lock_text_end = .;
614
615 #define CPUIDLE_TEXT \
616 ALIGN_FUNCTION(); \
617 __cpuidle_text_start = .; \
618 *(.cpuidle.text) \
619 __cpuidle_text_end = .;
620
621 #define KPROBES_TEXT \
622 ALIGN_FUNCTION(); \
623 __kprobes_text_start = .; \
624 *(.kprobes.text) \
625 __kprobes_text_end = .;
626
627 #define ENTRY_TEXT \
628 ALIGN_FUNCTION(); \
629 __entry_text_start = .; \
630 *(.entry.text) \
631 __entry_text_end = .;
632
633 #define IRQENTRY_TEXT \
634 ALIGN_FUNCTION(); \
635 __irqentry_text_start = .; \
636 *(.irqentry.text) \
637 __irqentry_text_end = .;
638
639 #define SOFTIRQENTRY_TEXT \
640 ALIGN_FUNCTION(); \
641 __softirqentry_text_start = .; \
642 *(.softirqentry.text) \
643 __softirqentry_text_end = .;
644
645 /* Section used for early init (in .S files) */
646 #define HEAD_TEXT KEEP(*(.head.text))
647
648 #define HEAD_TEXT_SECTION \
649 .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) { \
650 HEAD_TEXT \
651 }
652
653 /*
654 * Exception table
655 */
656 #define EXCEPTION_TABLE(align) \
657 . = ALIGN(align); \
658 __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) { \
659 __start___ex_table = .; \
660 KEEP(*(__ex_table)) \
661 __stop___ex_table = .; \
662 }
663
664 /*
665 * .BTF
666 */
667 #ifdef CONFIG_DEBUG_INFO_BTF
668 #define BTF \
669 .BTF : AT(ADDR(.BTF) - LOAD_OFFSET) { \
670 __start_BTF = .; \
671 *(.BTF) \
672 __stop_BTF = .; \
673 } \
674 . = ALIGN(4); \
675 .BTF_ids : AT(ADDR(.BTF_ids) - LOAD_OFFSET) { \
676 *(.BTF_ids) \
677 }
678 #else
679 #define BTF
680 #endif
681
682 /*
683 * Init task
684 */
685 #define INIT_TASK_DATA_SECTION(align) \
686 . = ALIGN(align); \
687 .data..init_task : AT(ADDR(.data..init_task) - LOAD_OFFSET) { \
688 INIT_TASK_DATA(align) \
689 }
690
691 #ifdef CONFIG_CONSTRUCTORS
692 #define KERNEL_CTORS() . = ALIGN(8); \
693 __ctors_start = .; \
694 KEEP(*(.ctors)) \
695 KEEP(*(SORT(.init_array.*))) \
696 KEEP(*(.init_array)) \
697 __ctors_end = .;
698 #else
699 #define KERNEL_CTORS()
700 #endif
701
702 /* init and exit section handling */
703 #define INIT_DATA \
704 KEEP(*(SORT(___kentry+*))) \
705 *(.init.data init.data.*) \
706 MEM_DISCARD(init.data*) \
707 KERNEL_CTORS() \
708 MCOUNT_REC() \
709 *(.init.rodata .init.rodata.*) \
710 FTRACE_EVENTS() \
711 TRACE_SYSCALLS() \
712 KPROBE_BLACKLIST() \
713 ERROR_INJECT_WHITELIST() \
714 MEM_DISCARD(init.rodata) \
715 CLK_OF_TABLES() \
716 RESERVEDMEM_OF_TABLES() \
717 TIMER_OF_TABLES() \
718 CPU_METHOD_OF_TABLES() \
719 CPUIDLE_METHOD_OF_TABLES() \
720 KERNEL_DTB() \
721 IRQCHIP_OF_MATCH_TABLE() \
722 ACPI_PROBE_TABLE(irqchip) \
723 ACPI_PROBE_TABLE(timer) \
724 THERMAL_TABLE(governor) \
725 EARLYCON_TABLE() \
726 LSM_TABLE() \
727 EARLY_LSM_TABLE()
728
729 #define INIT_TEXT \
730 *(.init.text .init.text.*) \
731 *(.text.startup) \
732 MEM_DISCARD(init.text*)
733
734 #define EXIT_DATA \
735 *(.exit.data .exit.data.*) \
736 *(.fini_array .fini_array.*) \
737 *(.dtors .dtors.*) \
738 MEM_DISCARD(exit.data*) \
739 MEM_DISCARD(exit.rodata*)
740
741 #define EXIT_TEXT \
742 *(.exit.text) \
743 *(.text.exit) \
744 MEM_DISCARD(exit.text)
745
746 #define EXIT_CALL \
747 *(.exitcall.exit)
748
749 /*
750 * bss (Block Started by Symbol) - uninitialized data
751 * zeroed during startup
752 */
753 #define SBSS(sbss_align) \
754 . = ALIGN(sbss_align); \
755 .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) { \
756 *(.dynsbss) \
757 *(SBSS_MAIN) \
758 *(.scommon) \
759 }
760
761 /*
762 * Allow archectures to redefine BSS_FIRST_SECTIONS to add extra
763 * sections to the front of bss.
764 */
765 #ifndef BSS_FIRST_SECTIONS
766 #define BSS_FIRST_SECTIONS
767 #endif
768
769 #define BSS(bss_align) \
770 . = ALIGN(bss_align); \
771 .bss : AT(ADDR(.bss) - LOAD_OFFSET) { \
772 BSS_FIRST_SECTIONS \
773 . = ALIGN(PAGE_SIZE); \
774 *(.bss..page_aligned) \
775 . = ALIGN(PAGE_SIZE); \
776 *(.dynbss) \
777 *(BSS_MAIN) \
778 *(COMMON) \
779 }
780
781 /*
782 * DWARF debug sections.
783 * Symbols in the DWARF debugging sections are relative to
784 * the beginning of the section so we begin them at 0.
785 */
786 #define DWARF_DEBUG \
787 /* DWARF 1 */ \
788 .debug 0 : { *(.debug) } \
789 .line 0 : { *(.line) } \
790 /* GNU DWARF 1 extensions */ \
791 .debug_srcinfo 0 : { *(.debug_srcinfo) } \
792 .debug_sfnames 0 : { *(.debug_sfnames) } \
793 /* DWARF 1.1 and DWARF 2 */ \
794 .debug_aranges 0 : { *(.debug_aranges) } \
795 .debug_pubnames 0 : { *(.debug_pubnames) } \
796 /* DWARF 2 */ \
797 .debug_info 0 : { *(.debug_info \
798 .gnu.linkonce.wi.*) } \
799 .debug_abbrev 0 : { *(.debug_abbrev) } \
800 .debug_line 0 : { *(.debug_line) } \
801 .debug_frame 0 : { *(.debug_frame) } \
802 .debug_str 0 : { *(.debug_str) } \
803 .debug_loc 0 : { *(.debug_loc) } \
804 .debug_macinfo 0 : { *(.debug_macinfo) } \
805 .debug_pubtypes 0 : { *(.debug_pubtypes) } \
806 /* DWARF 3 */ \
807 .debug_ranges 0 : { *(.debug_ranges) } \
808 /* SGI/MIPS DWARF 2 extensions */ \
809 .debug_weaknames 0 : { *(.debug_weaknames) } \
810 .debug_funcnames 0 : { *(.debug_funcnames) } \
811 .debug_typenames 0 : { *(.debug_typenames) } \
812 .debug_varnames 0 : { *(.debug_varnames) } \
813 /* GNU DWARF 2 extensions */ \
814 .debug_gnu_pubnames 0 : { *(.debug_gnu_pubnames) } \
815 .debug_gnu_pubtypes 0 : { *(.debug_gnu_pubtypes) } \
816 /* DWARF 4 */ \
817 .debug_types 0 : { *(.debug_types) } \
818 /* DWARF 5 */ \
819 .debug_macro 0 : { *(.debug_macro) } \
820 .debug_addr 0 : { *(.debug_addr) }
821
822 /* Stabs debugging sections. */
823 #define STABS_DEBUG \
824 .stab 0 : { *(.stab) } \
825 .stabstr 0 : { *(.stabstr) } \
826 .stab.excl 0 : { *(.stab.excl) } \
827 .stab.exclstr 0 : { *(.stab.exclstr) } \
828 .stab.index 0 : { *(.stab.index) } \
829 .stab.indexstr 0 : { *(.stab.indexstr) } \
830 .comment 0 : { *(.comment) }
831
832 #ifdef CONFIG_GENERIC_BUG
833 #define BUG_TABLE \
834 . = ALIGN(8); \
835 __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) { \
836 __start___bug_table = .; \
837 KEEP(*(__bug_table)) \
838 __stop___bug_table = .; \
839 }
840 #else
841 #define BUG_TABLE
842 #endif
843
844 #ifdef CONFIG_UNWINDER_ORC
845 #define ORC_UNWIND_TABLE \
846 . = ALIGN(4); \
847 .orc_unwind_ip : AT(ADDR(.orc_unwind_ip) - LOAD_OFFSET) { \
848 __start_orc_unwind_ip = .; \
849 KEEP(*(.orc_unwind_ip)) \
850 __stop_orc_unwind_ip = .; \
851 } \
852 . = ALIGN(2); \
853 .orc_unwind : AT(ADDR(.orc_unwind) - LOAD_OFFSET) { \
854 __start_orc_unwind = .; \
855 KEEP(*(.orc_unwind)) \
856 __stop_orc_unwind = .; \
857 } \
858 . = ALIGN(4); \
859 .orc_lookup : AT(ADDR(.orc_lookup) - LOAD_OFFSET) { \
860 orc_lookup = .; \
861 . += (((SIZEOF(.text) + LOOKUP_BLOCK_SIZE - 1) / \
862 LOOKUP_BLOCK_SIZE) + 1) * 4; \
863 orc_lookup_end = .; \
864 }
865 #else
866 #define ORC_UNWIND_TABLE
867 #endif
868
869 #ifdef CONFIG_PM_TRACE
870 #define TRACEDATA \
871 . = ALIGN(4); \
872 .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) { \
873 __tracedata_start = .; \
874 KEEP(*(.tracedata)) \
875 __tracedata_end = .; \
876 }
877 #else
878 #define TRACEDATA
879 #endif
880
881 #define NOTES \
882 .notes : AT(ADDR(.notes) - LOAD_OFFSET) { \
883 __start_notes = .; \
884 KEEP(*(.note.*)) \
885 __stop_notes = .; \
886 } NOTES_HEADERS \
887 NOTES_HEADERS_RESTORE
888
889 #define INIT_SETUP(initsetup_align) \
890 . = ALIGN(initsetup_align); \
891 __setup_start = .; \
892 KEEP(*(.init.setup)) \
893 __setup_end = .;
894
895 #define INIT_CALLS_LEVEL(level) \
896 __initcall##level##_start = .; \
897 KEEP(*(.initcall##level##.init)) \
898 KEEP(*(.initcall##level##s.init)) \
899
900 #define INIT_CALLS \
901 __initcall_start = .; \
902 KEEP(*(.initcallearly.init)) \
903 INIT_CALLS_LEVEL(0) \
904 INIT_CALLS_LEVEL(1) \
905 INIT_CALLS_LEVEL(2) \
906 INIT_CALLS_LEVEL(3) \
907 INIT_CALLS_LEVEL(4) \
908 INIT_CALLS_LEVEL(5) \
909 INIT_CALLS_LEVEL(rootfs) \
910 INIT_CALLS_LEVEL(6) \
911 INIT_CALLS_LEVEL(7) \
912 __initcall_end = .;
913
914 #define CON_INITCALL \
915 __con_initcall_start = .; \
916 KEEP(*(.con_initcall.init)) \
917 __con_initcall_end = .;
918
919 #ifdef CONFIG_BLK_DEV_INITRD
920 #define INIT_RAM_FS \
921 . = ALIGN(4); \
922 __initramfs_start = .; \
923 KEEP(*(.init.ramfs)) \
924 . = ALIGN(8); \
925 KEEP(*(.init.ramfs.info))
926 #else
927 #define INIT_RAM_FS
928 #endif
929
930 /*
931 * Memory encryption operates on a page basis. Since we need to clear
932 * the memory encryption mask for this section, it needs to be aligned
933 * on a page boundary and be a page-size multiple in length.
934 *
935 * Note: We use a separate section so that only this section gets
936 * decrypted to avoid exposing more than we wish.
937 */
938 #ifdef CONFIG_AMD_MEM_ENCRYPT
939 #define PERCPU_DECRYPTED_SECTION \
940 . = ALIGN(PAGE_SIZE); \
941 *(.data..percpu..decrypted) \
942 . = ALIGN(PAGE_SIZE);
943 #else
944 #define PERCPU_DECRYPTED_SECTION
945 #endif
946
947
948 /*
949 * Default discarded sections.
950 *
951 * Some archs want to discard exit text/data at runtime rather than
952 * link time due to cross-section references such as alt instructions,
953 * bug table, eh_frame, etc. DISCARDS must be the last of output
954 * section definitions so that such archs put those in earlier section
955 * definitions.
956 */
957 #ifdef RUNTIME_DISCARD_EXIT
958 #define EXIT_DISCARDS
959 #else
960 #define EXIT_DISCARDS \
961 EXIT_TEXT \
962 EXIT_DATA
963 #endif
964
965 #define DISCARDS \
966 /DISCARD/ : { \
967 EXIT_DISCARDS \
968 EXIT_CALL \
969 *(.discard) \
970 *(.discard.*) \
971 *(.modinfo) \
972 }
973
974 /**
975 * PERCPU_INPUT - the percpu input sections
976 * @cacheline: cacheline size
977 *
978 * The core percpu section names and core symbols which do not rely
979 * directly upon load addresses.
980 *
981 * @cacheline is used to align subsections to avoid false cacheline
982 * sharing between subsections for different purposes.
983 */
984 #define PERCPU_INPUT(cacheline) \
985 __per_cpu_start = .; \
986 *(.data..percpu..first) \
987 . = ALIGN(PAGE_SIZE); \
988 *(.data..percpu..page_aligned) \
989 . = ALIGN(cacheline); \
990 *(.data..percpu..read_mostly) \
991 . = ALIGN(cacheline); \
992 *(.data..percpu) \
993 *(.data..percpu..shared_aligned) \
994 PERCPU_DECRYPTED_SECTION \
995 __per_cpu_end = .;
996
997 /**
998 * PERCPU_VADDR - define output section for percpu area
999 * @cacheline: cacheline size
1000 * @vaddr: explicit base address (optional)
1001 * @phdr: destination PHDR (optional)
1002 *
1003 * Macro which expands to output section for percpu area.
1004 *
1005 * @cacheline is used to align subsections to avoid false cacheline
1006 * sharing between subsections for different purposes.
1007 *
1008 * If @vaddr is not blank, it specifies explicit base address and all
1009 * percpu symbols will be offset from the given address. If blank,
1010 * @vaddr always equals @laddr + LOAD_OFFSET.
1011 *
1012 * @phdr defines the output PHDR to use if not blank. Be warned that
1013 * output PHDR is sticky. If @phdr is specified, the next output
1014 * section in the linker script will go there too. @phdr should have
1015 * a leading colon.
1016 *
1017 * Note that this macros defines __per_cpu_load as an absolute symbol.
1018 * If there is no need to put the percpu section at a predetermined
1019 * address, use PERCPU_SECTION.
1020 */
1021 #define PERCPU_VADDR(cacheline, vaddr, phdr) \
1022 __per_cpu_load = .; \
1023 .data..percpu vaddr : AT(__per_cpu_load - LOAD_OFFSET) { \
1024 PERCPU_INPUT(cacheline) \
1025 } phdr \
1026 . = __per_cpu_load + SIZEOF(.data..percpu);
1027
1028 /**
1029 * PERCPU_SECTION - define output section for percpu area, simple version
1030 * @cacheline: cacheline size
1031 *
1032 * Align to PAGE_SIZE and outputs output section for percpu area. This
1033 * macro doesn't manipulate @vaddr or @phdr and __per_cpu_load and
1034 * __per_cpu_start will be identical.
1035 *
1036 * This macro is equivalent to ALIGN(PAGE_SIZE); PERCPU_VADDR(@cacheline,,)
1037 * except that __per_cpu_load is defined as a relative symbol against
1038 * .data..percpu which is required for relocatable x86_32 configuration.
1039 */
1040 #define PERCPU_SECTION(cacheline) \
1041 . = ALIGN(PAGE_SIZE); \
1042 .data..percpu : AT(ADDR(.data..percpu) - LOAD_OFFSET) { \
1043 __per_cpu_load = .; \
1044 PERCPU_INPUT(cacheline) \
1045 }
1046
1047
1048 /*
1049 * Definition of the high level *_SECTION macros
1050 * They will fit only a subset of the architectures
1051 */
1052
1053
1054 /*
1055 * Writeable data.
1056 * All sections are combined in a single .data section.
1057 * The sections following CONSTRUCTORS are arranged so their
1058 * typical alignment matches.
1059 * A cacheline is typical/always less than a PAGE_SIZE so
1060 * the sections that has this restriction (or similar)
1061 * is located before the ones requiring PAGE_SIZE alignment.
1062 * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which
1063 * matches the requirement of PAGE_ALIGNED_DATA.
1064 *
1065 * use 0 as page_align if page_aligned data is not used */
1066 #define RW_DATA(cacheline, pagealigned, inittask) \
1067 . = ALIGN(PAGE_SIZE); \
1068 .data : AT(ADDR(.data) - LOAD_OFFSET) { \
1069 INIT_TASK_DATA(inittask) \
1070 NOSAVE_DATA \
1071 PAGE_ALIGNED_DATA(pagealigned) \
1072 CACHELINE_ALIGNED_DATA(cacheline) \
1073 READ_MOSTLY_DATA(cacheline) \
1074 DATA_DATA \
1075 CONSTRUCTORS \
1076 } \
1077 BUG_TABLE \
1078
1079 #define INIT_TEXT_SECTION(inittext_align) \
1080 . = ALIGN(inittext_align); \
1081 .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) { \
1082 _sinittext = .; \
1083 INIT_TEXT \
1084 _einittext = .; \
1085 }
1086
1087 #define INIT_DATA_SECTION(initsetup_align) \
1088 .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) { \
1089 INIT_DATA \
1090 INIT_SETUP(initsetup_align) \
1091 INIT_CALLS \
1092 CON_INITCALL \
1093 INIT_RAM_FS \
1094 }
1095
1096 #define BSS_SECTION(sbss_align, bss_align, stop_align) \
1097 . = ALIGN(sbss_align); \
1098 __bss_start = .; \
1099 SBSS(sbss_align) \
1100 BSS(bss_align) \
1101 . = ALIGN(stop_align); \
1102 __bss_stop = .;
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