Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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 * ELF_DETAILS
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/*
58 * Only some architectures want to have the .notes segment visible in
59 * a separate PT_NOTE ELF Program Header. When this happens, it needs
60 * to be visible in both the kernel text's PT_LOAD and the PT_NOTE
61 * Program Headers. In this case, though, the PT_LOAD needs to be made
62 * the default again so that all the following sections don't also end
63 * up in the PT_NOTE Program Header.
64 */
65#ifdef EMITS_PT_NOTE
66#define NOTES_HEADERS :text :note
67#define NOTES_HEADERS_RESTORE __restore_ph : { *(.__restore_ph) } :text
68#else
69#define NOTES_HEADERS
70#define NOTES_HEADERS_RESTORE
71#endif
72
73/*
74 * Some architectures have non-executable read-only exception tables.
75 * They can be added to the RO_DATA segment by specifying their desired
76 * alignment.
77 */
78#ifdef RO_EXCEPTION_TABLE_ALIGN
79#define RO_EXCEPTION_TABLE EXCEPTION_TABLE(RO_EXCEPTION_TABLE_ALIGN)
80#else
81#define RO_EXCEPTION_TABLE
82#endif
83
84/* Align . function alignment. */
85#define ALIGN_FUNCTION() . = ALIGN(CONFIG_FUNCTION_ALIGNMENT)
86
87/*
88 * LD_DEAD_CODE_DATA_ELIMINATION option enables -fdata-sections, which
89 * generates .data.identifier sections, which need to be pulled in with
90 * .data. We don't want to pull in .data..other sections, which Linux
91 * has defined. Same for text and bss.
92 *
93 * With LTO_CLANG, the linker also splits sections by default, so we need
94 * these macros to combine the sections during the final link.
95 *
96 * RODATA_MAIN is not used because existing code already defines .rodata.x
97 * sections to be brought in with rodata.
98 */
99#if defined(CONFIG_LD_DEAD_CODE_DATA_ELIMINATION) || defined(CONFIG_LTO_CLANG)
100#define TEXT_MAIN .text .text.[0-9a-zA-Z_]*
101#define DATA_MAIN .data .data.[0-9a-zA-Z_]* .data..L* .data..compoundliteral* .data.$__unnamed_* .data.$L*
102#define SDATA_MAIN .sdata .sdata.[0-9a-zA-Z_]*
103#define RODATA_MAIN .rodata .rodata.[0-9a-zA-Z_]* .rodata..L*
104#define BSS_MAIN .bss .bss.[0-9a-zA-Z_]* .bss..compoundliteral*
105#define SBSS_MAIN .sbss .sbss.[0-9a-zA-Z_]*
106#else
107#define TEXT_MAIN .text
108#define DATA_MAIN .data
109#define SDATA_MAIN .sdata
110#define RODATA_MAIN .rodata
111#define BSS_MAIN .bss
112#define SBSS_MAIN .sbss
113#endif
114
115/*
116 * GCC 4.5 and later have a 32 bytes section alignment for structures.
117 * Except GCC 4.9, that feels the need to align on 64 bytes.
118 */
119#define STRUCT_ALIGNMENT 32
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 __sched_class_highest = .; \
130 *(__stop_sched_class) \
131 *(__dl_sched_class) \
132 *(__rt_sched_class) \
133 *(__fair_sched_class) \
134 *(__idle_sched_class) \
135 __sched_class_lowest = .;
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
142#if defined(CONFIG_MEMORY_HOTPLUG)
143#define MEM_KEEP(sec) *(.mem##sec)
144#define MEM_DISCARD(sec)
145#else
146#define MEM_KEEP(sec)
147#define MEM_DISCARD(sec) *(.mem##sec)
148#endif
149
150#ifndef CONFIG_HAVE_DYNAMIC_FTRACE_NO_PATCHABLE
151#define KEEP_PATCHABLE KEEP(*(__patchable_function_entries))
152#define PATCHABLE_DISCARDS
153#else
154#define KEEP_PATCHABLE
155#define PATCHABLE_DISCARDS *(__patchable_function_entries)
156#endif
157
158#ifndef CONFIG_ARCH_SUPPORTS_CFI_CLANG
159/*
160 * Simply points to ftrace_stub, but with the proper protocol.
161 * Defined by the linker script in linux/vmlinux.lds.h
162 */
163#define FTRACE_STUB_HACK ftrace_stub_graph = ftrace_stub;
164#else
165#define FTRACE_STUB_HACK
166#endif
167
168#ifdef CONFIG_FTRACE_MCOUNT_RECORD
169/*
170 * The ftrace call sites are logged to a section whose name depends on the
171 * compiler option used. A given kernel image will only use one, AKA
172 * FTRACE_CALLSITE_SECTION. We capture all of them here to avoid header
173 * dependencies for FTRACE_CALLSITE_SECTION's definition.
174 *
175 * ftrace_ops_list_func will be defined as arch_ftrace_ops_list_func
176 * as some archs will have a different prototype for that function
177 * but ftrace_ops_list_func() will have a single prototype.
178 */
179#define MCOUNT_REC() . = ALIGN(8); \
180 __start_mcount_loc = .; \
181 KEEP(*(__mcount_loc)) \
182 KEEP_PATCHABLE \
183 __stop_mcount_loc = .; \
184 FTRACE_STUB_HACK \
185 ftrace_ops_list_func = arch_ftrace_ops_list_func;
186#else
187# ifdef CONFIG_FUNCTION_TRACER
188# define MCOUNT_REC() FTRACE_STUB_HACK \
189 ftrace_ops_list_func = arch_ftrace_ops_list_func;
190# else
191# define MCOUNT_REC()
192# endif
193#endif
194
195#define BOUNDED_SECTION_PRE_LABEL(_sec_, _label_, _BEGIN_, _END_) \
196 _BEGIN_##_label_ = .; \
197 KEEP(*(_sec_)) \
198 _END_##_label_ = .;
199
200#define BOUNDED_SECTION_POST_LABEL(_sec_, _label_, _BEGIN_, _END_) \
201 _label_##_BEGIN_ = .; \
202 KEEP(*(_sec_)) \
203 _label_##_END_ = .;
204
205#define BOUNDED_SECTION_BY(_sec_, _label_) \
206 BOUNDED_SECTION_PRE_LABEL(_sec_, _label_, __start, __stop)
207
208#define BOUNDED_SECTION(_sec) BOUNDED_SECTION_BY(_sec, _sec)
209
210#define HEADERED_SECTION_PRE_LABEL(_sec_, _label_, _BEGIN_, _END_, _HDR_) \
211 _HDR_##_label_ = .; \
212 KEEP(*(.gnu.linkonce.##_sec_)) \
213 BOUNDED_SECTION_PRE_LABEL(_sec_, _label_, _BEGIN_, _END_)
214
215#define HEADERED_SECTION_POST_LABEL(_sec_, _label_, _BEGIN_, _END_, _HDR_) \
216 _label_##_HDR_ = .; \
217 KEEP(*(.gnu.linkonce.##_sec_)) \
218 BOUNDED_SECTION_POST_LABEL(_sec_, _label_, _BEGIN_, _END_)
219
220#define HEADERED_SECTION_BY(_sec_, _label_) \
221 HEADERED_SECTION_PRE_LABEL(_sec_, _label_, __start, __stop)
222
223#define HEADERED_SECTION(_sec) HEADERED_SECTION_BY(_sec, _sec)
224
225#ifdef CONFIG_TRACE_BRANCH_PROFILING
226#define LIKELY_PROFILE() \
227 BOUNDED_SECTION_BY(_ftrace_annotated_branch, _annotated_branch_profile)
228#else
229#define LIKELY_PROFILE()
230#endif
231
232#ifdef CONFIG_PROFILE_ALL_BRANCHES
233#define BRANCH_PROFILE() \
234 BOUNDED_SECTION_BY(_ftrace_branch, _branch_profile)
235#else
236#define BRANCH_PROFILE()
237#endif
238
239#ifdef CONFIG_KPROBES
240#define KPROBE_BLACKLIST() \
241 . = ALIGN(8); \
242 BOUNDED_SECTION(_kprobe_blacklist)
243#else
244#define KPROBE_BLACKLIST()
245#endif
246
247#ifdef CONFIG_FUNCTION_ERROR_INJECTION
248#define ERROR_INJECT_WHITELIST() \
249 STRUCT_ALIGN(); \
250 BOUNDED_SECTION(_error_injection_whitelist)
251#else
252#define ERROR_INJECT_WHITELIST()
253#endif
254
255#ifdef CONFIG_EVENT_TRACING
256#define FTRACE_EVENTS() \
257 . = ALIGN(8); \
258 BOUNDED_SECTION(_ftrace_events) \
259 BOUNDED_SECTION_BY(_ftrace_eval_map, _ftrace_eval_maps)
260#else
261#define FTRACE_EVENTS()
262#endif
263
264#ifdef CONFIG_TRACING
265#define TRACE_PRINTKS() BOUNDED_SECTION_BY(__trace_printk_fmt, ___trace_bprintk_fmt)
266#define TRACEPOINT_STR() BOUNDED_SECTION_BY(__tracepoint_str, ___tracepoint_str)
267#else
268#define TRACE_PRINTKS()
269#define TRACEPOINT_STR()
270#endif
271
272#ifdef CONFIG_FTRACE_SYSCALLS
273#define TRACE_SYSCALLS() \
274 . = ALIGN(8); \
275 BOUNDED_SECTION_BY(__syscalls_metadata, _syscalls_metadata)
276#else
277#define TRACE_SYSCALLS()
278#endif
279
280#ifdef CONFIG_BPF_EVENTS
281#define BPF_RAW_TP() STRUCT_ALIGN(); \
282 BOUNDED_SECTION_BY(__bpf_raw_tp_map, __bpf_raw_tp)
283#else
284#define BPF_RAW_TP()
285#endif
286
287#ifdef CONFIG_SERIAL_EARLYCON
288#define EARLYCON_TABLE() \
289 . = ALIGN(8); \
290 BOUNDED_SECTION_POST_LABEL(__earlycon_table, __earlycon_table, , _end)
291#else
292#define EARLYCON_TABLE()
293#endif
294
295#ifdef CONFIG_SECURITY
296#define LSM_TABLE() \
297 . = ALIGN(8); \
298 BOUNDED_SECTION_PRE_LABEL(.lsm_info.init, _lsm_info, __start, __end)
299
300#define EARLY_LSM_TABLE() \
301 . = ALIGN(8); \
302 BOUNDED_SECTION_PRE_LABEL(.early_lsm_info.init, _early_lsm_info, __start, __end)
303#else
304#define LSM_TABLE()
305#define EARLY_LSM_TABLE()
306#endif
307
308#define ___OF_TABLE(cfg, name) _OF_TABLE_##cfg(name)
309#define __OF_TABLE(cfg, name) ___OF_TABLE(cfg, name)
310#define OF_TABLE(cfg, name) __OF_TABLE(IS_ENABLED(cfg), name)
311#define _OF_TABLE_0(name)
312#define _OF_TABLE_1(name) \
313 . = ALIGN(8); \
314 __##name##_of_table = .; \
315 KEEP(*(__##name##_of_table)) \
316 KEEP(*(__##name##_of_table_end))
317
318#define TIMER_OF_TABLES() OF_TABLE(CONFIG_TIMER_OF, timer)
319#define IRQCHIP_OF_MATCH_TABLE() OF_TABLE(CONFIG_IRQCHIP, irqchip)
320#define CLK_OF_TABLES() OF_TABLE(CONFIG_COMMON_CLK, clk)
321#define RESERVEDMEM_OF_TABLES() OF_TABLE(CONFIG_OF_RESERVED_MEM, reservedmem)
322#define CPU_METHOD_OF_TABLES() OF_TABLE(CONFIG_SMP, cpu_method)
323#define CPUIDLE_METHOD_OF_TABLES() OF_TABLE(CONFIG_CPU_IDLE, cpuidle_method)
324
325#ifdef CONFIG_ACPI
326#define ACPI_PROBE_TABLE(name) \
327 . = ALIGN(8); \
328 BOUNDED_SECTION_POST_LABEL(__##name##_acpi_probe_table, \
329 __##name##_acpi_probe_table,, _end)
330#else
331#define ACPI_PROBE_TABLE(name)
332#endif
333
334#ifdef CONFIG_THERMAL
335#define THERMAL_TABLE(name) \
336 . = ALIGN(8); \
337 BOUNDED_SECTION_POST_LABEL(__##name##_thermal_table, \
338 __##name##_thermal_table,, _end)
339#else
340#define THERMAL_TABLE(name)
341#endif
342
343#define KERNEL_DTB() \
344 STRUCT_ALIGN(); \
345 __dtb_start = .; \
346 KEEP(*(.dtb.init.rodata)) \
347 __dtb_end = .;
348
349/*
350 * .data section
351 */
352#define DATA_DATA \
353 *(.xiptext) \
354 *(DATA_MAIN) \
355 *(.data..decrypted) \
356 *(.ref.data) \
357 *(.data..shared_aligned) /* percpu related */ \
358 MEM_KEEP(init.data*) \
359 MEM_KEEP(exit.data*) \
360 *(.data.unlikely) \
361 __start_once = .; \
362 *(.data.once) \
363 __end_once = .; \
364 STRUCT_ALIGN(); \
365 *(__tracepoints) \
366 /* implement dynamic printk debug */ \
367 . = ALIGN(8); \
368 BOUNDED_SECTION_BY(__dyndbg_classes, ___dyndbg_classes) \
369 BOUNDED_SECTION_BY(__dyndbg, ___dyndbg) \
370 LIKELY_PROFILE() \
371 BRANCH_PROFILE() \
372 TRACE_PRINTKS() \
373 BPF_RAW_TP() \
374 TRACEPOINT_STR()
375
376/*
377 * Data section helpers
378 */
379#define NOSAVE_DATA \
380 . = ALIGN(PAGE_SIZE); \
381 __nosave_begin = .; \
382 *(.data..nosave) \
383 . = ALIGN(PAGE_SIZE); \
384 __nosave_end = .;
385
386#define PAGE_ALIGNED_DATA(page_align) \
387 . = ALIGN(page_align); \
388 *(.data..page_aligned) \
389 . = ALIGN(page_align);
390
391#define READ_MOSTLY_DATA(align) \
392 . = ALIGN(align); \
393 *(.data..read_mostly) \
394 . = ALIGN(align);
395
396#define CACHELINE_ALIGNED_DATA(align) \
397 . = ALIGN(align); \
398 *(.data..cacheline_aligned)
399
400#define INIT_TASK_DATA(align) \
401 . = ALIGN(align); \
402 __start_init_task = .; \
403 init_thread_union = .; \
404 init_stack = .; \
405 KEEP(*(.data..init_task)) \
406 KEEP(*(.data..init_thread_info)) \
407 . = __start_init_task + THREAD_SIZE; \
408 __end_init_task = .;
409
410#define JUMP_TABLE_DATA \
411 . = ALIGN(8); \
412 BOUNDED_SECTION_BY(__jump_table, ___jump_table)
413
414#ifdef CONFIG_HAVE_STATIC_CALL_INLINE
415#define STATIC_CALL_DATA \
416 . = ALIGN(8); \
417 BOUNDED_SECTION_BY(.static_call_sites, _static_call_sites) \
418 BOUNDED_SECTION_BY(.static_call_tramp_key, _static_call_tramp_key)
419#else
420#define STATIC_CALL_DATA
421#endif
422
423/*
424 * Allow architectures to handle ro_after_init data on their
425 * own by defining an empty RO_AFTER_INIT_DATA.
426 */
427#ifndef RO_AFTER_INIT_DATA
428#define RO_AFTER_INIT_DATA \
429 . = ALIGN(8); \
430 __start_ro_after_init = .; \
431 *(.data..ro_after_init) \
432 JUMP_TABLE_DATA \
433 STATIC_CALL_DATA \
434 __end_ro_after_init = .;
435#endif
436
437/*
438 * .kcfi_traps contains a list KCFI trap locations.
439 */
440#ifndef KCFI_TRAPS
441#ifdef CONFIG_ARCH_USES_CFI_TRAPS
442#define KCFI_TRAPS \
443 __kcfi_traps : AT(ADDR(__kcfi_traps) - LOAD_OFFSET) { \
444 BOUNDED_SECTION_BY(.kcfi_traps, ___kcfi_traps) \
445 }
446#else
447#define KCFI_TRAPS
448#endif
449#endif
450
451/*
452 * Read only Data
453 */
454#define RO_DATA(align) \
455 . = ALIGN((align)); \
456 .rodata : AT(ADDR(.rodata) - LOAD_OFFSET) { \
457 __start_rodata = .; \
458 *(.rodata) *(.rodata.*) \
459 SCHED_DATA \
460 RO_AFTER_INIT_DATA /* Read only after init */ \
461 . = ALIGN(8); \
462 BOUNDED_SECTION_BY(__tracepoints_ptrs, ___tracepoints_ptrs) \
463 *(__tracepoints_strings)/* Tracepoints: strings */ \
464 } \
465 \
466 .rodata1 : AT(ADDR(.rodata1) - LOAD_OFFSET) { \
467 *(.rodata1) \
468 } \
469 \
470 /* PCI quirks */ \
471 .pci_fixup : AT(ADDR(.pci_fixup) - LOAD_OFFSET) { \
472 BOUNDED_SECTION_PRE_LABEL(.pci_fixup_early, _pci_fixups_early, __start, __end) \
473 BOUNDED_SECTION_PRE_LABEL(.pci_fixup_header, _pci_fixups_header, __start, __end) \
474 BOUNDED_SECTION_PRE_LABEL(.pci_fixup_final, _pci_fixups_final, __start, __end) \
475 BOUNDED_SECTION_PRE_LABEL(.pci_fixup_enable, _pci_fixups_enable, __start, __end) \
476 BOUNDED_SECTION_PRE_LABEL(.pci_fixup_resume, _pci_fixups_resume, __start, __end) \
477 BOUNDED_SECTION_PRE_LABEL(.pci_fixup_suspend, _pci_fixups_suspend, __start, __end) \
478 BOUNDED_SECTION_PRE_LABEL(.pci_fixup_resume_early, _pci_fixups_resume_early, __start, __end) \
479 BOUNDED_SECTION_PRE_LABEL(.pci_fixup_suspend_late, _pci_fixups_suspend_late, __start, __end) \
480 } \
481 \
482 FW_LOADER_BUILT_IN_DATA \
483 TRACEDATA \
484 \
485 PRINTK_INDEX \
486 \
487 /* Kernel symbol table: Normal symbols */ \
488 __ksymtab : AT(ADDR(__ksymtab) - LOAD_OFFSET) { \
489 __start___ksymtab = .; \
490 KEEP(*(SORT(___ksymtab+*))) \
491 __stop___ksymtab = .; \
492 } \
493 \
494 /* Kernel symbol table: GPL-only symbols */ \
495 __ksymtab_gpl : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) { \
496 __start___ksymtab_gpl = .; \
497 KEEP(*(SORT(___ksymtab_gpl+*))) \
498 __stop___ksymtab_gpl = .; \
499 } \
500 \
501 /* Kernel symbol table: Normal symbols */ \
502 __kcrctab : AT(ADDR(__kcrctab) - LOAD_OFFSET) { \
503 __start___kcrctab = .; \
504 KEEP(*(SORT(___kcrctab+*))) \
505 __stop___kcrctab = .; \
506 } \
507 \
508 /* Kernel symbol table: GPL-only symbols */ \
509 __kcrctab_gpl : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) { \
510 __start___kcrctab_gpl = .; \
511 KEEP(*(SORT(___kcrctab_gpl+*))) \
512 __stop___kcrctab_gpl = .; \
513 } \
514 \
515 /* Kernel symbol table: strings */ \
516 __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \
517 *(__ksymtab_strings) \
518 } \
519 \
520 /* __*init sections */ \
521 __init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) { \
522 *(.ref.rodata) \
523 MEM_KEEP(init.rodata) \
524 MEM_KEEP(exit.rodata) \
525 } \
526 \
527 /* Built-in module parameters. */ \
528 __param : AT(ADDR(__param) - LOAD_OFFSET) { \
529 BOUNDED_SECTION_BY(__param, ___param) \
530 } \
531 \
532 /* Built-in module versions. */ \
533 __modver : AT(ADDR(__modver) - LOAD_OFFSET) { \
534 BOUNDED_SECTION_BY(__modver, ___modver) \
535 } \
536 \
537 KCFI_TRAPS \
538 \
539 RO_EXCEPTION_TABLE \
540 NOTES \
541 BTF \
542 \
543 . = ALIGN((align)); \
544 __end_rodata = .;
545
546
547/*
548 * Non-instrumentable text section
549 */
550#define NOINSTR_TEXT \
551 ALIGN_FUNCTION(); \
552 __noinstr_text_start = .; \
553 *(.noinstr.text) \
554 __cpuidle_text_start = .; \
555 *(.cpuidle.text) \
556 __cpuidle_text_end = .; \
557 __noinstr_text_end = .;
558
559/*
560 * .text section. Map to function alignment to avoid address changes
561 * during second ld run in second ld pass when generating System.map
562 *
563 * TEXT_MAIN here will match .text.fixup and .text.unlikely if dead
564 * code elimination is enabled, so these sections should be converted
565 * to use ".." first.
566 */
567#define TEXT_TEXT \
568 ALIGN_FUNCTION(); \
569 *(.text.hot .text.hot.*) \
570 *(TEXT_MAIN .text.fixup) \
571 *(.text.unlikely .text.unlikely.*) \
572 *(.text.unknown .text.unknown.*) \
573 NOINSTR_TEXT \
574 *(.ref.text) \
575 *(.text.asan.* .text.tsan.*) \
576 MEM_KEEP(init.text*) \
577 MEM_KEEP(exit.text*) \
578
579
580/* sched.text is aling to function alignment to secure we have same
581 * address even at second ld pass when generating System.map */
582#define SCHED_TEXT \
583 ALIGN_FUNCTION(); \
584 __sched_text_start = .; \
585 *(.sched.text) \
586 __sched_text_end = .;
587
588/* spinlock.text is aling to function alignment to secure we have same
589 * address even at second ld pass when generating System.map */
590#define LOCK_TEXT \
591 ALIGN_FUNCTION(); \
592 __lock_text_start = .; \
593 *(.spinlock.text) \
594 __lock_text_end = .;
595
596#define KPROBES_TEXT \
597 ALIGN_FUNCTION(); \
598 __kprobes_text_start = .; \
599 *(.kprobes.text) \
600 __kprobes_text_end = .;
601
602#define ENTRY_TEXT \
603 ALIGN_FUNCTION(); \
604 __entry_text_start = .; \
605 *(.entry.text) \
606 __entry_text_end = .;
607
608#define IRQENTRY_TEXT \
609 ALIGN_FUNCTION(); \
610 __irqentry_text_start = .; \
611 *(.irqentry.text) \
612 __irqentry_text_end = .;
613
614#define SOFTIRQENTRY_TEXT \
615 ALIGN_FUNCTION(); \
616 __softirqentry_text_start = .; \
617 *(.softirqentry.text) \
618 __softirqentry_text_end = .;
619
620#define STATIC_CALL_TEXT \
621 ALIGN_FUNCTION(); \
622 __static_call_text_start = .; \
623 *(.static_call.text) \
624 __static_call_text_end = .;
625
626/* Section used for early init (in .S files) */
627#define HEAD_TEXT KEEP(*(.head.text))
628
629#define HEAD_TEXT_SECTION \
630 .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) { \
631 HEAD_TEXT \
632 }
633
634/*
635 * Exception table
636 */
637#define EXCEPTION_TABLE(align) \
638 . = ALIGN(align); \
639 __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) { \
640 BOUNDED_SECTION_BY(__ex_table, ___ex_table) \
641 }
642
643/*
644 * .BTF
645 */
646#ifdef CONFIG_DEBUG_INFO_BTF
647#define BTF \
648 .BTF : AT(ADDR(.BTF) - LOAD_OFFSET) { \
649 BOUNDED_SECTION_BY(.BTF, _BTF) \
650 } \
651 . = ALIGN(4); \
652 .BTF_ids : AT(ADDR(.BTF_ids) - LOAD_OFFSET) { \
653 *(.BTF_ids) \
654 }
655#else
656#define BTF
657#endif
658
659/*
660 * Init task
661 */
662#define INIT_TASK_DATA_SECTION(align) \
663 . = ALIGN(align); \
664 .data..init_task : AT(ADDR(.data..init_task) - LOAD_OFFSET) { \
665 INIT_TASK_DATA(align) \
666 }
667
668#ifdef CONFIG_CONSTRUCTORS
669#define KERNEL_CTORS() . = ALIGN(8); \
670 __ctors_start = .; \
671 KEEP(*(SORT(.ctors.*))) \
672 KEEP(*(.ctors)) \
673 KEEP(*(SORT(.init_array.*))) \
674 KEEP(*(.init_array)) \
675 __ctors_end = .;
676#else
677#define KERNEL_CTORS()
678#endif
679
680/* init and exit section handling */
681#define INIT_DATA \
682 KEEP(*(SORT(___kentry+*))) \
683 *(.init.data .init.data.*) \
684 MEM_DISCARD(init.data*) \
685 KERNEL_CTORS() \
686 MCOUNT_REC() \
687 *(.init.rodata .init.rodata.*) \
688 FTRACE_EVENTS() \
689 TRACE_SYSCALLS() \
690 KPROBE_BLACKLIST() \
691 ERROR_INJECT_WHITELIST() \
692 MEM_DISCARD(init.rodata) \
693 CLK_OF_TABLES() \
694 RESERVEDMEM_OF_TABLES() \
695 TIMER_OF_TABLES() \
696 CPU_METHOD_OF_TABLES() \
697 CPUIDLE_METHOD_OF_TABLES() \
698 KERNEL_DTB() \
699 IRQCHIP_OF_MATCH_TABLE() \
700 ACPI_PROBE_TABLE(irqchip) \
701 ACPI_PROBE_TABLE(timer) \
702 THERMAL_TABLE(governor) \
703 EARLYCON_TABLE() \
704 LSM_TABLE() \
705 EARLY_LSM_TABLE() \
706 KUNIT_TABLE()
707
708#define INIT_TEXT \
709 *(.init.text .init.text.*) \
710 *(.text.startup) \
711 MEM_DISCARD(init.text*)
712
713#define EXIT_DATA \
714 *(.exit.data .exit.data.*) \
715 *(.fini_array .fini_array.*) \
716 *(.dtors .dtors.*) \
717 MEM_DISCARD(exit.data*) \
718 MEM_DISCARD(exit.rodata*)
719
720#define EXIT_TEXT \
721 *(.exit.text) \
722 *(.text.exit) \
723 MEM_DISCARD(exit.text)
724
725#define EXIT_CALL \
726 *(.exitcall.exit)
727
728/*
729 * bss (Block Started by Symbol) - uninitialized data
730 * zeroed during startup
731 */
732#define SBSS(sbss_align) \
733 . = ALIGN(sbss_align); \
734 .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) { \
735 *(.dynsbss) \
736 *(SBSS_MAIN) \
737 *(.scommon) \
738 }
739
740/*
741 * Allow archectures to redefine BSS_FIRST_SECTIONS to add extra
742 * sections to the front of bss.
743 */
744#ifndef BSS_FIRST_SECTIONS
745#define BSS_FIRST_SECTIONS
746#endif
747
748#define BSS(bss_align) \
749 . = ALIGN(bss_align); \
750 .bss : AT(ADDR(.bss) - LOAD_OFFSET) { \
751 BSS_FIRST_SECTIONS \
752 . = ALIGN(PAGE_SIZE); \
753 *(.bss..page_aligned) \
754 . = ALIGN(PAGE_SIZE); \
755 *(.dynbss) \
756 *(BSS_MAIN) \
757 *(COMMON) \
758 }
759
760/*
761 * DWARF debug sections.
762 * Symbols in the DWARF debugging sections are relative to
763 * the beginning of the section so we begin them at 0.
764 */
765#define DWARF_DEBUG \
766 /* DWARF 1 */ \
767 .debug 0 : { *(.debug) } \
768 .line 0 : { *(.line) } \
769 /* GNU DWARF 1 extensions */ \
770 .debug_srcinfo 0 : { *(.debug_srcinfo) } \
771 .debug_sfnames 0 : { *(.debug_sfnames) } \
772 /* DWARF 1.1 and DWARF 2 */ \
773 .debug_aranges 0 : { *(.debug_aranges) } \
774 .debug_pubnames 0 : { *(.debug_pubnames) } \
775 /* DWARF 2 */ \
776 .debug_info 0 : { *(.debug_info \
777 .gnu.linkonce.wi.*) } \
778 .debug_abbrev 0 : { *(.debug_abbrev) } \
779 .debug_line 0 : { *(.debug_line) } \
780 .debug_frame 0 : { *(.debug_frame) } \
781 .debug_str 0 : { *(.debug_str) } \
782 .debug_loc 0 : { *(.debug_loc) } \
783 .debug_macinfo 0 : { *(.debug_macinfo) } \
784 .debug_pubtypes 0 : { *(.debug_pubtypes) } \
785 /* DWARF 3 */ \
786 .debug_ranges 0 : { *(.debug_ranges) } \
787 /* SGI/MIPS DWARF 2 extensions */ \
788 .debug_weaknames 0 : { *(.debug_weaknames) } \
789 .debug_funcnames 0 : { *(.debug_funcnames) } \
790 .debug_typenames 0 : { *(.debug_typenames) } \
791 .debug_varnames 0 : { *(.debug_varnames) } \
792 /* GNU DWARF 2 extensions */ \
793 .debug_gnu_pubnames 0 : { *(.debug_gnu_pubnames) } \
794 .debug_gnu_pubtypes 0 : { *(.debug_gnu_pubtypes) } \
795 /* DWARF 4 */ \
796 .debug_types 0 : { *(.debug_types) } \
797 /* DWARF 5 */ \
798 .debug_addr 0 : { *(.debug_addr) } \
799 .debug_line_str 0 : { *(.debug_line_str) } \
800 .debug_loclists 0 : { *(.debug_loclists) } \
801 .debug_macro 0 : { *(.debug_macro) } \
802 .debug_names 0 : { *(.debug_names) } \
803 .debug_rnglists 0 : { *(.debug_rnglists) } \
804 .debug_str_offsets 0 : { *(.debug_str_offsets) }
805
806/* Stabs debugging sections. */
807#define STABS_DEBUG \
808 .stab 0 : { *(.stab) } \
809 .stabstr 0 : { *(.stabstr) } \
810 .stab.excl 0 : { *(.stab.excl) } \
811 .stab.exclstr 0 : { *(.stab.exclstr) } \
812 .stab.index 0 : { *(.stab.index) } \
813 .stab.indexstr 0 : { *(.stab.indexstr) }
814
815/* Required sections not related to debugging. */
816#define ELF_DETAILS \
817 .comment 0 : { *(.comment) } \
818 .symtab 0 : { *(.symtab) } \
819 .strtab 0 : { *(.strtab) } \
820 .shstrtab 0 : { *(.shstrtab) }
821
822#ifdef CONFIG_GENERIC_BUG
823#define BUG_TABLE \
824 . = ALIGN(8); \
825 __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) { \
826 BOUNDED_SECTION_BY(__bug_table, ___bug_table) \
827 }
828#else
829#define BUG_TABLE
830#endif
831
832#ifdef CONFIG_UNWINDER_ORC
833#define ORC_UNWIND_TABLE \
834 .orc_header : AT(ADDR(.orc_header) - LOAD_OFFSET) { \
835 BOUNDED_SECTION_BY(.orc_header, _orc_header) \
836 } \
837 . = ALIGN(4); \
838 .orc_unwind_ip : AT(ADDR(.orc_unwind_ip) - LOAD_OFFSET) { \
839 BOUNDED_SECTION_BY(.orc_unwind_ip, _orc_unwind_ip) \
840 } \
841 . = ALIGN(2); \
842 .orc_unwind : AT(ADDR(.orc_unwind) - LOAD_OFFSET) { \
843 BOUNDED_SECTION_BY(.orc_unwind, _orc_unwind) \
844 } \
845 text_size = _etext - _stext; \
846 . = ALIGN(4); \
847 .orc_lookup : AT(ADDR(.orc_lookup) - LOAD_OFFSET) { \
848 orc_lookup = .; \
849 . += (((text_size + LOOKUP_BLOCK_SIZE - 1) / \
850 LOOKUP_BLOCK_SIZE) + 1) * 4; \
851 orc_lookup_end = .; \
852 }
853#else
854#define ORC_UNWIND_TABLE
855#endif
856
857/* Built-in firmware blobs */
858#ifdef CONFIG_FW_LOADER
859#define FW_LOADER_BUILT_IN_DATA \
860 .builtin_fw : AT(ADDR(.builtin_fw) - LOAD_OFFSET) ALIGN(8) { \
861 BOUNDED_SECTION_PRE_LABEL(.builtin_fw, _builtin_fw, __start, __end) \
862 }
863#else
864#define FW_LOADER_BUILT_IN_DATA
865#endif
866
867#ifdef CONFIG_PM_TRACE
868#define TRACEDATA \
869 . = ALIGN(4); \
870 .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) { \
871 BOUNDED_SECTION_POST_LABEL(.tracedata, __tracedata, _start, _end) \
872 }
873#else
874#define TRACEDATA
875#endif
876
877#ifdef CONFIG_PRINTK_INDEX
878#define PRINTK_INDEX \
879 .printk_index : AT(ADDR(.printk_index) - LOAD_OFFSET) { \
880 BOUNDED_SECTION_BY(.printk_index, _printk_index) \
881 }
882#else
883#define PRINTK_INDEX
884#endif
885
886/*
887 * Discard .note.GNU-stack, which is emitted as PROGBITS by the compiler.
888 * Otherwise, the type of .notes section would become PROGBITS instead of NOTES.
889 *
890 * Also, discard .note.gnu.property, otherwise it forces the notes section to
891 * be 8-byte aligned which causes alignment mismatches with the kernel's custom
892 * 4-byte aligned notes.
893 */
894#define NOTES \
895 /DISCARD/ : { \
896 *(.note.GNU-stack) \
897 *(.note.gnu.property) \
898 } \
899 .notes : AT(ADDR(.notes) - LOAD_OFFSET) { \
900 BOUNDED_SECTION_BY(.note.*, _notes) \
901 } NOTES_HEADERS \
902 NOTES_HEADERS_RESTORE
903
904#define INIT_SETUP(initsetup_align) \
905 . = ALIGN(initsetup_align); \
906 BOUNDED_SECTION_POST_LABEL(.init.setup, __setup, _start, _end)
907
908#define INIT_CALLS_LEVEL(level) \
909 __initcall##level##_start = .; \
910 KEEP(*(.initcall##level##.init)) \
911 KEEP(*(.initcall##level##s.init)) \
912
913#define INIT_CALLS \
914 __initcall_start = .; \
915 KEEP(*(.initcallearly.init)) \
916 INIT_CALLS_LEVEL(0) \
917 INIT_CALLS_LEVEL(1) \
918 INIT_CALLS_LEVEL(2) \
919 INIT_CALLS_LEVEL(3) \
920 INIT_CALLS_LEVEL(4) \
921 INIT_CALLS_LEVEL(5) \
922 INIT_CALLS_LEVEL(rootfs) \
923 INIT_CALLS_LEVEL(6) \
924 INIT_CALLS_LEVEL(7) \
925 __initcall_end = .;
926
927#define CON_INITCALL \
928 BOUNDED_SECTION_POST_LABEL(.con_initcall.init, __con_initcall, _start, _end)
929
930/* Alignment must be consistent with (kunit_suite *) in include/kunit/test.h */
931#define KUNIT_TABLE() \
932 . = ALIGN(8); \
933 BOUNDED_SECTION_POST_LABEL(.kunit_test_suites, __kunit_suites, _start, _end)
934
935#ifdef CONFIG_BLK_DEV_INITRD
936#define INIT_RAM_FS \
937 . = ALIGN(4); \
938 __initramfs_start = .; \
939 KEEP(*(.init.ramfs)) \
940 . = ALIGN(8); \
941 KEEP(*(.init.ramfs.info))
942#else
943#define INIT_RAM_FS
944#endif
945
946/*
947 * Memory encryption operates on a page basis. Since we need to clear
948 * the memory encryption mask for this section, it needs to be aligned
949 * on a page boundary and be a page-size multiple in length.
950 *
951 * Note: We use a separate section so that only this section gets
952 * decrypted to avoid exposing more than we wish.
953 */
954#ifdef CONFIG_AMD_MEM_ENCRYPT
955#define PERCPU_DECRYPTED_SECTION \
956 . = ALIGN(PAGE_SIZE); \
957 *(.data..percpu..decrypted) \
958 . = ALIGN(PAGE_SIZE);
959#else
960#define PERCPU_DECRYPTED_SECTION
961#endif
962
963
964/*
965 * Default discarded sections.
966 *
967 * Some archs want to discard exit text/data at runtime rather than
968 * link time due to cross-section references such as alt instructions,
969 * bug table, eh_frame, etc. DISCARDS must be the last of output
970 * section definitions so that such archs put those in earlier section
971 * definitions.
972 */
973#ifdef RUNTIME_DISCARD_EXIT
974#define EXIT_DISCARDS
975#else
976#define EXIT_DISCARDS \
977 EXIT_TEXT \
978 EXIT_DATA
979#endif
980
981/*
982 * Clang's -fprofile-arcs, -fsanitize=kernel-address, and
983 * -fsanitize=thread produce unwanted sections (.eh_frame
984 * and .init_array.*), but CONFIG_CONSTRUCTORS wants to
985 * keep any .init_array.* sections.
986 * https://bugs.llvm.org/show_bug.cgi?id=46478
987 */
988#ifdef CONFIG_UNWIND_TABLES
989#define DISCARD_EH_FRAME
990#else
991#define DISCARD_EH_FRAME *(.eh_frame)
992#endif
993#if defined(CONFIG_GCOV_KERNEL) || defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KCSAN)
994# ifdef CONFIG_CONSTRUCTORS
995# define SANITIZER_DISCARDS \
996 DISCARD_EH_FRAME
997# else
998# define SANITIZER_DISCARDS \
999 *(.init_array) *(.init_array.*) \
1000 DISCARD_EH_FRAME
1001# endif
1002#else
1003# define SANITIZER_DISCARDS
1004#endif
1005
1006#define COMMON_DISCARDS \
1007 SANITIZER_DISCARDS \
1008 PATCHABLE_DISCARDS \
1009 *(.discard) \
1010 *(.discard.*) \
1011 *(.export_symbol) \
1012 *(.modinfo) \
1013 /* ld.bfd warns about .gnu.version* even when not emitted */ \
1014 *(.gnu.version*) \
1015
1016#define DISCARDS \
1017 /DISCARD/ : { \
1018 EXIT_DISCARDS \
1019 EXIT_CALL \
1020 COMMON_DISCARDS \
1021 }
1022
1023/**
1024 * PERCPU_INPUT - the percpu input sections
1025 * @cacheline: cacheline size
1026 *
1027 * The core percpu section names and core symbols which do not rely
1028 * directly upon load addresses.
1029 *
1030 * @cacheline is used to align subsections to avoid false cacheline
1031 * sharing between subsections for different purposes.
1032 */
1033#define PERCPU_INPUT(cacheline) \
1034 __per_cpu_start = .; \
1035 *(.data..percpu..first) \
1036 . = ALIGN(PAGE_SIZE); \
1037 *(.data..percpu..page_aligned) \
1038 . = ALIGN(cacheline); \
1039 *(.data..percpu..read_mostly) \
1040 . = ALIGN(cacheline); \
1041 *(.data..percpu) \
1042 *(.data..percpu..shared_aligned) \
1043 PERCPU_DECRYPTED_SECTION \
1044 __per_cpu_end = .;
1045
1046/**
1047 * PERCPU_VADDR - define output section for percpu area
1048 * @cacheline: cacheline size
1049 * @vaddr: explicit base address (optional)
1050 * @phdr: destination PHDR (optional)
1051 *
1052 * Macro which expands to output section for percpu area.
1053 *
1054 * @cacheline is used to align subsections to avoid false cacheline
1055 * sharing between subsections for different purposes.
1056 *
1057 * If @vaddr is not blank, it specifies explicit base address and all
1058 * percpu symbols will be offset from the given address. If blank,
1059 * @vaddr always equals @laddr + LOAD_OFFSET.
1060 *
1061 * @phdr defines the output PHDR to use if not blank. Be warned that
1062 * output PHDR is sticky. If @phdr is specified, the next output
1063 * section in the linker script will go there too. @phdr should have
1064 * a leading colon.
1065 *
1066 * Note that this macros defines __per_cpu_load as an absolute symbol.
1067 * If there is no need to put the percpu section at a predetermined
1068 * address, use PERCPU_SECTION.
1069 */
1070#define PERCPU_VADDR(cacheline, vaddr, phdr) \
1071 __per_cpu_load = .; \
1072 .data..percpu vaddr : AT(__per_cpu_load - LOAD_OFFSET) { \
1073 PERCPU_INPUT(cacheline) \
1074 } phdr \
1075 . = __per_cpu_load + SIZEOF(.data..percpu);
1076
1077/**
1078 * PERCPU_SECTION - define output section for percpu area, simple version
1079 * @cacheline: cacheline size
1080 *
1081 * Align to PAGE_SIZE and outputs output section for percpu area. This
1082 * macro doesn't manipulate @vaddr or @phdr and __per_cpu_load and
1083 * __per_cpu_start will be identical.
1084 *
1085 * This macro is equivalent to ALIGN(PAGE_SIZE); PERCPU_VADDR(@cacheline,,)
1086 * except that __per_cpu_load is defined as a relative symbol against
1087 * .data..percpu which is required for relocatable x86_32 configuration.
1088 */
1089#define PERCPU_SECTION(cacheline) \
1090 . = ALIGN(PAGE_SIZE); \
1091 .data..percpu : AT(ADDR(.data..percpu) - LOAD_OFFSET) { \
1092 __per_cpu_load = .; \
1093 PERCPU_INPUT(cacheline) \
1094 }
1095
1096
1097/*
1098 * Definition of the high level *_SECTION macros
1099 * They will fit only a subset of the architectures
1100 */
1101
1102
1103/*
1104 * Writeable data.
1105 * All sections are combined in a single .data section.
1106 * The sections following CONSTRUCTORS are arranged so their
1107 * typical alignment matches.
1108 * A cacheline is typical/always less than a PAGE_SIZE so
1109 * the sections that has this restriction (or similar)
1110 * is located before the ones requiring PAGE_SIZE alignment.
1111 * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which
1112 * matches the requirement of PAGE_ALIGNED_DATA.
1113 *
1114 * use 0 as page_align if page_aligned data is not used */
1115#define RW_DATA(cacheline, pagealigned, inittask) \
1116 . = ALIGN(PAGE_SIZE); \
1117 .data : AT(ADDR(.data) - LOAD_OFFSET) { \
1118 INIT_TASK_DATA(inittask) \
1119 NOSAVE_DATA \
1120 PAGE_ALIGNED_DATA(pagealigned) \
1121 CACHELINE_ALIGNED_DATA(cacheline) \
1122 READ_MOSTLY_DATA(cacheline) \
1123 DATA_DATA \
1124 CONSTRUCTORS \
1125 } \
1126 BUG_TABLE \
1127
1128#define INIT_TEXT_SECTION(inittext_align) \
1129 . = ALIGN(inittext_align); \
1130 .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) { \
1131 _sinittext = .; \
1132 INIT_TEXT \
1133 _einittext = .; \
1134 }
1135
1136#define INIT_DATA_SECTION(initsetup_align) \
1137 .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) { \
1138 INIT_DATA \
1139 INIT_SETUP(initsetup_align) \
1140 INIT_CALLS \
1141 CON_INITCALL \
1142 INIT_RAM_FS \
1143 }
1144
1145#define BSS_SECTION(sbss_align, bss_align, stop_align) \
1146 . = ALIGN(sbss_align); \
1147 __bss_start = .; \
1148 SBSS(sbss_align) \
1149 BSS(bss_align) \
1150 . = ALIGN(stop_align); \
1151 __bss_stop = .;