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 requirements]
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#include <asm-generic/codetag.lds.h>
54
55#ifndef LOAD_OFFSET
56#define LOAD_OFFSET 0
57#endif
58
59/*
60 * Only some architectures want to have the .notes segment visible in
61 * a separate PT_NOTE ELF Program Header. When this happens, it needs
62 * to be visible in both the kernel text's PT_LOAD and the PT_NOTE
63 * Program Headers. In this case, though, the PT_LOAD needs to be made
64 * the default again so that all the following sections don't also end
65 * up in the PT_NOTE Program Header.
66 */
67#ifdef EMITS_PT_NOTE
68#define NOTES_HEADERS :text :note
69#define NOTES_HEADERS_RESTORE __restore_ph : { *(.__restore_ph) } :text
70#else
71#define NOTES_HEADERS
72#define NOTES_HEADERS_RESTORE
73#endif
74
75/*
76 * Some architectures have non-executable read-only exception tables.
77 * They can be added to the RO_DATA segment by specifying their desired
78 * alignment.
79 */
80#ifdef RO_EXCEPTION_TABLE_ALIGN
81#define RO_EXCEPTION_TABLE EXCEPTION_TABLE(RO_EXCEPTION_TABLE_ALIGN)
82#else
83#define RO_EXCEPTION_TABLE
84#endif
85
86/* Align . function alignment. */
87#define ALIGN_FUNCTION() . = ALIGN(CONFIG_FUNCTION_ALIGNMENT)
88
89/*
90 * LD_DEAD_CODE_DATA_ELIMINATION option enables -fdata-sections, which
91 * generates .data.identifier sections, which need to be pulled in with
92 * .data. We don't want to pull in .data..other sections, which Linux
93 * has defined. Same for text and bss.
94 *
95 * With LTO_CLANG, the linker also splits sections by default, so we need
96 * these macros to combine the sections during the final link.
97 *
98 * RODATA_MAIN is not used because existing code already defines .rodata.x
99 * sections to be brought in with rodata.
100 */
101#if defined(CONFIG_LD_DEAD_CODE_DATA_ELIMINATION) || defined(CONFIG_LTO_CLANG)
102#define TEXT_MAIN .text .text.[0-9a-zA-Z_]*
103#define DATA_MAIN .data .data.[0-9a-zA-Z_]* .data..L* .data..compoundliteral* .data.$__unnamed_* .data.$L*
104#define SDATA_MAIN .sdata .sdata.[0-9a-zA-Z_]*
105#define RODATA_MAIN .rodata .rodata.[0-9a-zA-Z_]* .rodata..L*
106#define BSS_MAIN .bss .bss.[0-9a-zA-Z_]* .bss..L* .bss..compoundliteral*
107#define SBSS_MAIN .sbss .sbss.[0-9a-zA-Z_]*
108#else
109#define TEXT_MAIN .text
110#define DATA_MAIN .data
111#define SDATA_MAIN .sdata
112#define RODATA_MAIN .rodata
113#define BSS_MAIN .bss
114#define SBSS_MAIN .sbss
115#endif
116
117/*
118 * GCC 4.5 and later have a 32 bytes section alignment for structures.
119 * Except GCC 4.9, that feels the need to align on 64 bytes.
120 */
121#define STRUCT_ALIGNMENT 32
122#define STRUCT_ALIGN() . = ALIGN(STRUCT_ALIGNMENT)
123
124/*
125 * The order of the sched class addresses are important, as they are
126 * used to determine the order of the priority of each sched class in
127 * relation to each other.
128 */
129#define SCHED_DATA \
130 STRUCT_ALIGN(); \
131 __sched_class_highest = .; \
132 *(__stop_sched_class) \
133 *(__dl_sched_class) \
134 *(__rt_sched_class) \
135 *(__fair_sched_class) \
136 *(__ext_sched_class) \
137 *(__idle_sched_class) \
138 __sched_class_lowest = .;
139
140/* The actual configuration determine if the init/exit sections
141 * are handled as text/data or they can be discarded (which
142 * often happens at runtime)
143 */
144
145#ifndef CONFIG_HAVE_DYNAMIC_FTRACE_NO_PATCHABLE
146#define KEEP_PATCHABLE KEEP(*(__patchable_function_entries))
147#define PATCHABLE_DISCARDS
148#else
149#define KEEP_PATCHABLE
150#define PATCHABLE_DISCARDS *(__patchable_function_entries)
151#endif
152
153#ifndef CONFIG_ARCH_SUPPORTS_CFI_CLANG
154/*
155 * Simply points to ftrace_stub, but with the proper protocol.
156 * Defined by the linker script in linux/vmlinux.lds.h
157 */
158#define FTRACE_STUB_HACK ftrace_stub_graph = ftrace_stub;
159#else
160#define FTRACE_STUB_HACK
161#endif
162
163#ifdef CONFIG_FTRACE_MCOUNT_RECORD
164/*
165 * The ftrace call sites are logged to a section whose name depends on the
166 * compiler option used. A given kernel image will only use one, AKA
167 * FTRACE_CALLSITE_SECTION. We capture all of them here to avoid header
168 * dependencies for FTRACE_CALLSITE_SECTION's definition.
169 *
170 * ftrace_ops_list_func will be defined as arch_ftrace_ops_list_func
171 * as some archs will have a different prototype for that function
172 * but ftrace_ops_list_func() will have a single prototype.
173 */
174#define MCOUNT_REC() . = ALIGN(8); \
175 __start_mcount_loc = .; \
176 KEEP(*(__mcount_loc)) \
177 KEEP_PATCHABLE \
178 __stop_mcount_loc = .; \
179 FTRACE_STUB_HACK \
180 ftrace_ops_list_func = arch_ftrace_ops_list_func;
181#else
182# ifdef CONFIG_FUNCTION_TRACER
183# define MCOUNT_REC() FTRACE_STUB_HACK \
184 ftrace_ops_list_func = arch_ftrace_ops_list_func;
185# else
186# define MCOUNT_REC()
187# endif
188#endif
189
190#define BOUNDED_SECTION_PRE_LABEL(_sec_, _label_, _BEGIN_, _END_) \
191 _BEGIN_##_label_ = .; \
192 KEEP(*(_sec_)) \
193 _END_##_label_ = .;
194
195#define BOUNDED_SECTION_POST_LABEL(_sec_, _label_, _BEGIN_, _END_) \
196 _label_##_BEGIN_ = .; \
197 KEEP(*(_sec_)) \
198 _label_##_END_ = .;
199
200#define BOUNDED_SECTION_BY(_sec_, _label_) \
201 BOUNDED_SECTION_PRE_LABEL(_sec_, _label_, __start, __stop)
202
203#define BOUNDED_SECTION(_sec) BOUNDED_SECTION_BY(_sec, _sec)
204
205#define HEADERED_SECTION_PRE_LABEL(_sec_, _label_, _BEGIN_, _END_, _HDR_) \
206 _HDR_##_label_ = .; \
207 KEEP(*(.gnu.linkonce.##_sec_)) \
208 BOUNDED_SECTION_PRE_LABEL(_sec_, _label_, _BEGIN_, _END_)
209
210#define HEADERED_SECTION_POST_LABEL(_sec_, _label_, _BEGIN_, _END_, _HDR_) \
211 _label_##_HDR_ = .; \
212 KEEP(*(.gnu.linkonce.##_sec_)) \
213 BOUNDED_SECTION_POST_LABEL(_sec_, _label_, _BEGIN_, _END_)
214
215#define HEADERED_SECTION_BY(_sec_, _label_) \
216 HEADERED_SECTION_PRE_LABEL(_sec_, _label_, __start, __stop)
217
218#define HEADERED_SECTION(_sec) HEADERED_SECTION_BY(_sec, _sec)
219
220#ifdef CONFIG_TRACE_BRANCH_PROFILING
221#define LIKELY_PROFILE() \
222 BOUNDED_SECTION_BY(_ftrace_annotated_branch, _annotated_branch_profile)
223#else
224#define LIKELY_PROFILE()
225#endif
226
227#ifdef CONFIG_PROFILE_ALL_BRANCHES
228#define BRANCH_PROFILE() \
229 BOUNDED_SECTION_BY(_ftrace_branch, _branch_profile)
230#else
231#define BRANCH_PROFILE()
232#endif
233
234#ifdef CONFIG_KPROBES
235#define KPROBE_BLACKLIST() \
236 . = ALIGN(8); \
237 BOUNDED_SECTION(_kprobe_blacklist)
238#else
239#define KPROBE_BLACKLIST()
240#endif
241
242#ifdef CONFIG_FUNCTION_ERROR_INJECTION
243#define ERROR_INJECT_WHITELIST() \
244 STRUCT_ALIGN(); \
245 BOUNDED_SECTION(_error_injection_whitelist)
246#else
247#define ERROR_INJECT_WHITELIST()
248#endif
249
250#ifdef CONFIG_EVENT_TRACING
251#define FTRACE_EVENTS() \
252 . = ALIGN(8); \
253 BOUNDED_SECTION(_ftrace_events) \
254 BOUNDED_SECTION_BY(_ftrace_eval_map, _ftrace_eval_maps)
255#else
256#define FTRACE_EVENTS()
257#endif
258
259#ifdef CONFIG_TRACING
260#define TRACE_PRINTKS() BOUNDED_SECTION_BY(__trace_printk_fmt, ___trace_bprintk_fmt)
261#define TRACEPOINT_STR() BOUNDED_SECTION_BY(__tracepoint_str, ___tracepoint_str)
262#else
263#define TRACE_PRINTKS()
264#define TRACEPOINT_STR()
265#endif
266
267#ifdef CONFIG_FTRACE_SYSCALLS
268#define TRACE_SYSCALLS() \
269 . = ALIGN(8); \
270 BOUNDED_SECTION_BY(__syscalls_metadata, _syscalls_metadata)
271#else
272#define TRACE_SYSCALLS()
273#endif
274
275#ifdef CONFIG_BPF_EVENTS
276#define BPF_RAW_TP() STRUCT_ALIGN(); \
277 BOUNDED_SECTION_BY(__bpf_raw_tp_map, __bpf_raw_tp)
278#else
279#define BPF_RAW_TP()
280#endif
281
282#ifdef CONFIG_SERIAL_EARLYCON
283#define EARLYCON_TABLE() \
284 . = ALIGN(8); \
285 BOUNDED_SECTION_POST_LABEL(__earlycon_table, __earlycon_table, , _end)
286#else
287#define EARLYCON_TABLE()
288#endif
289
290#ifdef CONFIG_SECURITY
291#define LSM_TABLE() \
292 . = ALIGN(8); \
293 BOUNDED_SECTION_PRE_LABEL(.lsm_info.init, _lsm_info, __start, __end)
294
295#define EARLY_LSM_TABLE() \
296 . = ALIGN(8); \
297 BOUNDED_SECTION_PRE_LABEL(.early_lsm_info.init, _early_lsm_info, __start, __end)
298#else
299#define LSM_TABLE()
300#define EARLY_LSM_TABLE()
301#endif
302
303#define ___OF_TABLE(cfg, name) _OF_TABLE_##cfg(name)
304#define __OF_TABLE(cfg, name) ___OF_TABLE(cfg, name)
305#define OF_TABLE(cfg, name) __OF_TABLE(IS_ENABLED(cfg), name)
306#define _OF_TABLE_0(name)
307#define _OF_TABLE_1(name) \
308 . = ALIGN(8); \
309 __##name##_of_table = .; \
310 KEEP(*(__##name##_of_table)) \
311 KEEP(*(__##name##_of_table_end))
312
313#define TIMER_OF_TABLES() OF_TABLE(CONFIG_TIMER_OF, timer)
314#define IRQCHIP_OF_MATCH_TABLE() OF_TABLE(CONFIG_IRQCHIP, irqchip)
315#define CLK_OF_TABLES() OF_TABLE(CONFIG_COMMON_CLK, clk)
316#define RESERVEDMEM_OF_TABLES() OF_TABLE(CONFIG_OF_RESERVED_MEM, reservedmem)
317#define CPU_METHOD_OF_TABLES() OF_TABLE(CONFIG_SMP, cpu_method)
318#define CPUIDLE_METHOD_OF_TABLES() OF_TABLE(CONFIG_CPU_IDLE, cpuidle_method)
319
320#ifdef CONFIG_ACPI
321#define ACPI_PROBE_TABLE(name) \
322 . = ALIGN(8); \
323 BOUNDED_SECTION_POST_LABEL(__##name##_acpi_probe_table, \
324 __##name##_acpi_probe_table,, _end)
325#else
326#define ACPI_PROBE_TABLE(name)
327#endif
328
329#ifdef CONFIG_THERMAL
330#define THERMAL_TABLE(name) \
331 . = ALIGN(8); \
332 BOUNDED_SECTION_POST_LABEL(__##name##_thermal_table, \
333 __##name##_thermal_table,, _end)
334#else
335#define THERMAL_TABLE(name)
336#endif
337
338#define KERNEL_DTB() \
339 STRUCT_ALIGN(); \
340 __dtb_start = .; \
341 KEEP(*(.dtb.init.rodata)) \
342 __dtb_end = .;
343
344/*
345 * .data section
346 */
347#define DATA_DATA \
348 *(.xiptext) \
349 *(DATA_MAIN) \
350 *(.data..decrypted) \
351 *(.ref.data) \
352 *(.data..shared_aligned) /* percpu related */ \
353 *(.data.unlikely) \
354 __start_once = .; \
355 *(.data.once) \
356 __end_once = .; \
357 STRUCT_ALIGN(); \
358 *(__tracepoints) \
359 /* implement dynamic printk debug */ \
360 . = ALIGN(8); \
361 BOUNDED_SECTION_BY(__dyndbg_classes, ___dyndbg_classes) \
362 BOUNDED_SECTION_BY(__dyndbg, ___dyndbg) \
363 CODETAG_SECTIONS() \
364 LIKELY_PROFILE() \
365 BRANCH_PROFILE() \
366 TRACE_PRINTKS() \
367 BPF_RAW_TP() \
368 TRACEPOINT_STR() \
369 KUNIT_TABLE()
370
371/*
372 * Data section helpers
373 */
374#define NOSAVE_DATA \
375 . = ALIGN(PAGE_SIZE); \
376 __nosave_begin = .; \
377 *(.data..nosave) \
378 . = ALIGN(PAGE_SIZE); \
379 __nosave_end = .;
380
381#define PAGE_ALIGNED_DATA(page_align) \
382 . = ALIGN(page_align); \
383 *(.data..page_aligned) \
384 . = ALIGN(page_align);
385
386#define READ_MOSTLY_DATA(align) \
387 . = ALIGN(align); \
388 *(.data..read_mostly) \
389 . = ALIGN(align);
390
391#define CACHELINE_ALIGNED_DATA(align) \
392 . = ALIGN(align); \
393 *(.data..cacheline_aligned)
394
395#define INIT_TASK_DATA(align) \
396 . = ALIGN(align); \
397 __start_init_stack = .; \
398 init_thread_union = .; \
399 init_stack = .; \
400 KEEP(*(.data..init_task)) \
401 KEEP(*(.data..init_thread_info)) \
402 . = __start_init_stack + THREAD_SIZE; \
403 __end_init_stack = .;
404
405#define JUMP_TABLE_DATA \
406 . = ALIGN(8); \
407 BOUNDED_SECTION_BY(__jump_table, ___jump_table)
408
409#ifdef CONFIG_HAVE_STATIC_CALL_INLINE
410#define STATIC_CALL_DATA \
411 . = ALIGN(8); \
412 BOUNDED_SECTION_BY(.static_call_sites, _static_call_sites) \
413 BOUNDED_SECTION_BY(.static_call_tramp_key, _static_call_tramp_key)
414#else
415#define STATIC_CALL_DATA
416#endif
417
418/*
419 * Allow architectures to handle ro_after_init data on their
420 * own by defining an empty RO_AFTER_INIT_DATA.
421 */
422#ifndef RO_AFTER_INIT_DATA
423#define RO_AFTER_INIT_DATA \
424 . = ALIGN(8); \
425 __start_ro_after_init = .; \
426 *(.data..ro_after_init) \
427 JUMP_TABLE_DATA \
428 STATIC_CALL_DATA \
429 __end_ro_after_init = .;
430#endif
431
432/*
433 * .kcfi_traps contains a list KCFI trap locations.
434 */
435#ifndef KCFI_TRAPS
436#ifdef CONFIG_ARCH_USES_CFI_TRAPS
437#define KCFI_TRAPS \
438 __kcfi_traps : AT(ADDR(__kcfi_traps) - LOAD_OFFSET) { \
439 BOUNDED_SECTION_BY(.kcfi_traps, ___kcfi_traps) \
440 }
441#else
442#define KCFI_TRAPS
443#endif
444#endif
445
446/*
447 * Read only Data
448 */
449#define RO_DATA(align) \
450 . = ALIGN((align)); \
451 .rodata : AT(ADDR(.rodata) - LOAD_OFFSET) { \
452 __start_rodata = .; \
453 *(.rodata) *(.rodata.*) \
454 SCHED_DATA \
455 RO_AFTER_INIT_DATA /* Read only after init */ \
456 . = ALIGN(8); \
457 BOUNDED_SECTION_BY(__tracepoints_ptrs, ___tracepoints_ptrs) \
458 *(__tracepoints_strings)/* Tracepoints: strings */ \
459 } \
460 \
461 .rodata1 : AT(ADDR(.rodata1) - LOAD_OFFSET) { \
462 *(.rodata1) \
463 } \
464 \
465 /* PCI quirks */ \
466 .pci_fixup : AT(ADDR(.pci_fixup) - LOAD_OFFSET) { \
467 BOUNDED_SECTION_PRE_LABEL(.pci_fixup_early, _pci_fixups_early, __start, __end) \
468 BOUNDED_SECTION_PRE_LABEL(.pci_fixup_header, _pci_fixups_header, __start, __end) \
469 BOUNDED_SECTION_PRE_LABEL(.pci_fixup_final, _pci_fixups_final, __start, __end) \
470 BOUNDED_SECTION_PRE_LABEL(.pci_fixup_enable, _pci_fixups_enable, __start, __end) \
471 BOUNDED_SECTION_PRE_LABEL(.pci_fixup_resume, _pci_fixups_resume, __start, __end) \
472 BOUNDED_SECTION_PRE_LABEL(.pci_fixup_suspend, _pci_fixups_suspend, __start, __end) \
473 BOUNDED_SECTION_PRE_LABEL(.pci_fixup_resume_early, _pci_fixups_resume_early, __start, __end) \
474 BOUNDED_SECTION_PRE_LABEL(.pci_fixup_suspend_late, _pci_fixups_suspend_late, __start, __end) \
475 } \
476 \
477 FW_LOADER_BUILT_IN_DATA \
478 TRACEDATA \
479 \
480 PRINTK_INDEX \
481 \
482 /* Kernel symbol table: Normal symbols */ \
483 __ksymtab : AT(ADDR(__ksymtab) - LOAD_OFFSET) { \
484 __start___ksymtab = .; \
485 KEEP(*(SORT(___ksymtab+*))) \
486 __stop___ksymtab = .; \
487 } \
488 \
489 /* Kernel symbol table: GPL-only symbols */ \
490 __ksymtab_gpl : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) { \
491 __start___ksymtab_gpl = .; \
492 KEEP(*(SORT(___ksymtab_gpl+*))) \
493 __stop___ksymtab_gpl = .; \
494 } \
495 \
496 /* Kernel symbol table: Normal symbols */ \
497 __kcrctab : AT(ADDR(__kcrctab) - LOAD_OFFSET) { \
498 __start___kcrctab = .; \
499 KEEP(*(SORT(___kcrctab+*))) \
500 __stop___kcrctab = .; \
501 } \
502 \
503 /* Kernel symbol table: GPL-only symbols */ \
504 __kcrctab_gpl : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) { \
505 __start___kcrctab_gpl = .; \
506 KEEP(*(SORT(___kcrctab_gpl+*))) \
507 __stop___kcrctab_gpl = .; \
508 } \
509 \
510 /* Kernel symbol table: strings */ \
511 __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \
512 *(__ksymtab_strings) \
513 } \
514 \
515 /* __*init sections */ \
516 __init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) { \
517 *(.ref.rodata) \
518 } \
519 \
520 /* Built-in module parameters. */ \
521 __param : AT(ADDR(__param) - LOAD_OFFSET) { \
522 BOUNDED_SECTION_BY(__param, ___param) \
523 } \
524 \
525 /* Built-in module versions. */ \
526 __modver : AT(ADDR(__modver) - LOAD_OFFSET) { \
527 BOUNDED_SECTION_BY(__modver, ___modver) \
528 } \
529 \
530 KCFI_TRAPS \
531 \
532 RO_EXCEPTION_TABLE \
533 NOTES \
534 BTF \
535 \
536 . = ALIGN((align)); \
537 __end_rodata = .;
538
539
540/*
541 * Non-instrumentable text section
542 */
543#define NOINSTR_TEXT \
544 ALIGN_FUNCTION(); \
545 __noinstr_text_start = .; \
546 *(.noinstr.text) \
547 __cpuidle_text_start = .; \
548 *(.cpuidle.text) \
549 __cpuidle_text_end = .; \
550 __noinstr_text_end = .;
551
552/*
553 * .text section. Map to function alignment to avoid address changes
554 * during second ld run in second ld pass when generating System.map
555 *
556 * TEXT_MAIN here will match .text.fixup and .text.unlikely if dead
557 * code elimination is enabled, so these sections should be converted
558 * to use ".." first.
559 */
560#define TEXT_TEXT \
561 ALIGN_FUNCTION(); \
562 *(.text.hot .text.hot.*) \
563 *(TEXT_MAIN .text.fixup) \
564 *(.text.unlikely .text.unlikely.*) \
565 *(.text.unknown .text.unknown.*) \
566 NOINSTR_TEXT \
567 *(.ref.text) \
568 *(.text.asan.* .text.tsan.*)
569
570
571/* sched.text is aling to function alignment to secure we have same
572 * address even at second ld pass when generating System.map */
573#define SCHED_TEXT \
574 ALIGN_FUNCTION(); \
575 __sched_text_start = .; \
576 *(.sched.text) \
577 __sched_text_end = .;
578
579/* spinlock.text is aling to function alignment to secure we have same
580 * address even at second ld pass when generating System.map */
581#define LOCK_TEXT \
582 ALIGN_FUNCTION(); \
583 __lock_text_start = .; \
584 *(.spinlock.text) \
585 __lock_text_end = .;
586
587#define KPROBES_TEXT \
588 ALIGN_FUNCTION(); \
589 __kprobes_text_start = .; \
590 *(.kprobes.text) \
591 __kprobes_text_end = .;
592
593#define ENTRY_TEXT \
594 ALIGN_FUNCTION(); \
595 __entry_text_start = .; \
596 *(.entry.text) \
597 __entry_text_end = .;
598
599#define IRQENTRY_TEXT \
600 ALIGN_FUNCTION(); \
601 __irqentry_text_start = .; \
602 *(.irqentry.text) \
603 __irqentry_text_end = .;
604
605#define SOFTIRQENTRY_TEXT \
606 ALIGN_FUNCTION(); \
607 __softirqentry_text_start = .; \
608 *(.softirqentry.text) \
609 __softirqentry_text_end = .;
610
611#define STATIC_CALL_TEXT \
612 ALIGN_FUNCTION(); \
613 __static_call_text_start = .; \
614 *(.static_call.text) \
615 __static_call_text_end = .;
616
617/* Section used for early init (in .S files) */
618#define HEAD_TEXT KEEP(*(.head.text))
619
620#define HEAD_TEXT_SECTION \
621 .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) { \
622 HEAD_TEXT \
623 }
624
625/*
626 * Exception table
627 */
628#define EXCEPTION_TABLE(align) \
629 . = ALIGN(align); \
630 __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) { \
631 BOUNDED_SECTION_BY(__ex_table, ___ex_table) \
632 }
633
634/*
635 * .BTF
636 */
637#ifdef CONFIG_DEBUG_INFO_BTF
638#define BTF \
639 .BTF : AT(ADDR(.BTF) - LOAD_OFFSET) { \
640 BOUNDED_SECTION_BY(.BTF, _BTF) \
641 } \
642 . = ALIGN(4); \
643 .BTF_ids : AT(ADDR(.BTF_ids) - LOAD_OFFSET) { \
644 *(.BTF_ids) \
645 }
646#else
647#define BTF
648#endif
649
650/*
651 * Init task
652 */
653#define INIT_TASK_DATA_SECTION(align) \
654 . = ALIGN(align); \
655 .data..init_task : AT(ADDR(.data..init_task) - LOAD_OFFSET) { \
656 INIT_TASK_DATA(align) \
657 }
658
659#ifdef CONFIG_CONSTRUCTORS
660#define KERNEL_CTORS() . = ALIGN(8); \
661 __ctors_start = .; \
662 KEEP(*(SORT(.ctors.*))) \
663 KEEP(*(.ctors)) \
664 KEEP(*(SORT(.init_array.*))) \
665 KEEP(*(.init_array)) \
666 __ctors_end = .;
667#else
668#define KERNEL_CTORS()
669#endif
670
671/* init and exit section handling */
672#define INIT_DATA \
673 KEEP(*(SORT(___kentry+*))) \
674 *(.init.data .init.data.*) \
675 KERNEL_CTORS() \
676 MCOUNT_REC() \
677 *(.init.rodata .init.rodata.*) \
678 FTRACE_EVENTS() \
679 TRACE_SYSCALLS() \
680 KPROBE_BLACKLIST() \
681 ERROR_INJECT_WHITELIST() \
682 CLK_OF_TABLES() \
683 RESERVEDMEM_OF_TABLES() \
684 TIMER_OF_TABLES() \
685 CPU_METHOD_OF_TABLES() \
686 CPUIDLE_METHOD_OF_TABLES() \
687 KERNEL_DTB() \
688 IRQCHIP_OF_MATCH_TABLE() \
689 ACPI_PROBE_TABLE(irqchip) \
690 ACPI_PROBE_TABLE(timer) \
691 THERMAL_TABLE(governor) \
692 EARLYCON_TABLE() \
693 LSM_TABLE() \
694 EARLY_LSM_TABLE() \
695 KUNIT_INIT_TABLE()
696
697#define INIT_TEXT \
698 *(.init.text .init.text.*) \
699 *(.text.startup)
700
701#define EXIT_DATA \
702 *(.exit.data .exit.data.*) \
703 *(.fini_array .fini_array.*) \
704 *(.dtors .dtors.*) \
705
706#define EXIT_TEXT \
707 *(.exit.text) \
708 *(.text.exit) \
709
710#define EXIT_CALL \
711 *(.exitcall.exit)
712
713/*
714 * bss (Block Started by Symbol) - uninitialized data
715 * zeroed during startup
716 */
717#define SBSS(sbss_align) \
718 . = ALIGN(sbss_align); \
719 .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) { \
720 *(.dynsbss) \
721 *(SBSS_MAIN) \
722 *(.scommon) \
723 }
724
725/*
726 * Allow archectures to redefine BSS_FIRST_SECTIONS to add extra
727 * sections to the front of bss.
728 */
729#ifndef BSS_FIRST_SECTIONS
730#define BSS_FIRST_SECTIONS
731#endif
732
733#define BSS(bss_align) \
734 . = ALIGN(bss_align); \
735 .bss : AT(ADDR(.bss) - LOAD_OFFSET) { \
736 BSS_FIRST_SECTIONS \
737 . = ALIGN(PAGE_SIZE); \
738 *(.bss..page_aligned) \
739 . = ALIGN(PAGE_SIZE); \
740 *(.dynbss) \
741 *(BSS_MAIN) \
742 *(COMMON) \
743 }
744
745/*
746 * DWARF debug sections.
747 * Symbols in the DWARF debugging sections are relative to
748 * the beginning of the section so we begin them at 0.
749 */
750#define DWARF_DEBUG \
751 /* DWARF 1 */ \
752 .debug 0 : { *(.debug) } \
753 .line 0 : { *(.line) } \
754 /* GNU DWARF 1 extensions */ \
755 .debug_srcinfo 0 : { *(.debug_srcinfo) } \
756 .debug_sfnames 0 : { *(.debug_sfnames) } \
757 /* DWARF 1.1 and DWARF 2 */ \
758 .debug_aranges 0 : { *(.debug_aranges) } \
759 .debug_pubnames 0 : { *(.debug_pubnames) } \
760 /* DWARF 2 */ \
761 .debug_info 0 : { *(.debug_info \
762 .gnu.linkonce.wi.*) } \
763 .debug_abbrev 0 : { *(.debug_abbrev) } \
764 .debug_line 0 : { *(.debug_line) } \
765 .debug_frame 0 : { *(.debug_frame) } \
766 .debug_str 0 : { *(.debug_str) } \
767 .debug_loc 0 : { *(.debug_loc) } \
768 .debug_macinfo 0 : { *(.debug_macinfo) } \
769 .debug_pubtypes 0 : { *(.debug_pubtypes) } \
770 /* DWARF 3 */ \
771 .debug_ranges 0 : { *(.debug_ranges) } \
772 /* SGI/MIPS DWARF 2 extensions */ \
773 .debug_weaknames 0 : { *(.debug_weaknames) } \
774 .debug_funcnames 0 : { *(.debug_funcnames) } \
775 .debug_typenames 0 : { *(.debug_typenames) } \
776 .debug_varnames 0 : { *(.debug_varnames) } \
777 /* GNU DWARF 2 extensions */ \
778 .debug_gnu_pubnames 0 : { *(.debug_gnu_pubnames) } \
779 .debug_gnu_pubtypes 0 : { *(.debug_gnu_pubtypes) } \
780 /* DWARF 4 */ \
781 .debug_types 0 : { *(.debug_types) } \
782 /* DWARF 5 */ \
783 .debug_addr 0 : { *(.debug_addr) } \
784 .debug_line_str 0 : { *(.debug_line_str) } \
785 .debug_loclists 0 : { *(.debug_loclists) } \
786 .debug_macro 0 : { *(.debug_macro) } \
787 .debug_names 0 : { *(.debug_names) } \
788 .debug_rnglists 0 : { *(.debug_rnglists) } \
789 .debug_str_offsets 0 : { *(.debug_str_offsets) }
790
791/* Stabs debugging sections. */
792#define STABS_DEBUG \
793 .stab 0 : { *(.stab) } \
794 .stabstr 0 : { *(.stabstr) } \
795 .stab.excl 0 : { *(.stab.excl) } \
796 .stab.exclstr 0 : { *(.stab.exclstr) } \
797 .stab.index 0 : { *(.stab.index) } \
798 .stab.indexstr 0 : { *(.stab.indexstr) }
799
800/* Required sections not related to debugging. */
801#define ELF_DETAILS \
802 .comment 0 : { *(.comment) } \
803 .symtab 0 : { *(.symtab) } \
804 .strtab 0 : { *(.strtab) } \
805 .shstrtab 0 : { *(.shstrtab) }
806
807#ifdef CONFIG_GENERIC_BUG
808#define BUG_TABLE \
809 . = ALIGN(8); \
810 __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) { \
811 BOUNDED_SECTION_BY(__bug_table, ___bug_table) \
812 }
813#else
814#define BUG_TABLE
815#endif
816
817#ifdef CONFIG_UNWINDER_ORC
818#define ORC_UNWIND_TABLE \
819 .orc_header : AT(ADDR(.orc_header) - LOAD_OFFSET) { \
820 BOUNDED_SECTION_BY(.orc_header, _orc_header) \
821 } \
822 . = ALIGN(4); \
823 .orc_unwind_ip : AT(ADDR(.orc_unwind_ip) - LOAD_OFFSET) { \
824 BOUNDED_SECTION_BY(.orc_unwind_ip, _orc_unwind_ip) \
825 } \
826 . = ALIGN(2); \
827 .orc_unwind : AT(ADDR(.orc_unwind) - LOAD_OFFSET) { \
828 BOUNDED_SECTION_BY(.orc_unwind, _orc_unwind) \
829 } \
830 text_size = _etext - _stext; \
831 . = ALIGN(4); \
832 .orc_lookup : AT(ADDR(.orc_lookup) - LOAD_OFFSET) { \
833 orc_lookup = .; \
834 . += (((text_size + LOOKUP_BLOCK_SIZE - 1) / \
835 LOOKUP_BLOCK_SIZE) + 1) * 4; \
836 orc_lookup_end = .; \
837 }
838#else
839#define ORC_UNWIND_TABLE
840#endif
841
842/* Built-in firmware blobs */
843#ifdef CONFIG_FW_LOADER
844#define FW_LOADER_BUILT_IN_DATA \
845 .builtin_fw : AT(ADDR(.builtin_fw) - LOAD_OFFSET) ALIGN(8) { \
846 BOUNDED_SECTION_PRE_LABEL(.builtin_fw, _builtin_fw, __start, __end) \
847 }
848#else
849#define FW_LOADER_BUILT_IN_DATA
850#endif
851
852#ifdef CONFIG_PM_TRACE
853#define TRACEDATA \
854 . = ALIGN(4); \
855 .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) { \
856 BOUNDED_SECTION_POST_LABEL(.tracedata, __tracedata, _start, _end) \
857 }
858#else
859#define TRACEDATA
860#endif
861
862#ifdef CONFIG_PRINTK_INDEX
863#define PRINTK_INDEX \
864 .printk_index : AT(ADDR(.printk_index) - LOAD_OFFSET) { \
865 BOUNDED_SECTION_BY(.printk_index, _printk_index) \
866 }
867#else
868#define PRINTK_INDEX
869#endif
870
871/*
872 * Discard .note.GNU-stack, which is emitted as PROGBITS by the compiler.
873 * Otherwise, the type of .notes section would become PROGBITS instead of NOTES.
874 *
875 * Also, discard .note.gnu.property, otherwise it forces the notes section to
876 * be 8-byte aligned which causes alignment mismatches with the kernel's custom
877 * 4-byte aligned notes.
878 */
879#define NOTES \
880 /DISCARD/ : { \
881 *(.note.GNU-stack) \
882 *(.note.gnu.property) \
883 } \
884 .notes : AT(ADDR(.notes) - LOAD_OFFSET) { \
885 BOUNDED_SECTION_BY(.note.*, _notes) \
886 } NOTES_HEADERS \
887 NOTES_HEADERS_RESTORE
888
889#define INIT_SETUP(initsetup_align) \
890 . = ALIGN(initsetup_align); \
891 BOUNDED_SECTION_POST_LABEL(.init.setup, __setup, _start, _end)
892
893#define INIT_CALLS_LEVEL(level) \
894 __initcall##level##_start = .; \
895 KEEP(*(.initcall##level##.init)) \
896 KEEP(*(.initcall##level##s.init)) \
897
898#define INIT_CALLS \
899 __initcall_start = .; \
900 KEEP(*(.initcallearly.init)) \
901 INIT_CALLS_LEVEL(0) \
902 INIT_CALLS_LEVEL(1) \
903 INIT_CALLS_LEVEL(2) \
904 INIT_CALLS_LEVEL(3) \
905 INIT_CALLS_LEVEL(4) \
906 INIT_CALLS_LEVEL(5) \
907 INIT_CALLS_LEVEL(rootfs) \
908 INIT_CALLS_LEVEL(6) \
909 INIT_CALLS_LEVEL(7) \
910 __initcall_end = .;
911
912#define CON_INITCALL \
913 BOUNDED_SECTION_POST_LABEL(.con_initcall.init, __con_initcall, _start, _end)
914
915#define NAMED_SECTION(name) \
916 . = ALIGN(8); \
917 name : AT(ADDR(name) - LOAD_OFFSET) \
918 { BOUNDED_SECTION_PRE_LABEL(name, name, __start_, __stop_) }
919
920#define RUNTIME_CONST(t,x) NAMED_SECTION(runtime_##t##_##x)
921
922#define RUNTIME_CONST_VARIABLES \
923 RUNTIME_CONST(shift, d_hash_shift) \
924 RUNTIME_CONST(ptr, dentry_hashtable)
925
926/* Alignment must be consistent with (kunit_suite *) in include/kunit/test.h */
927#define KUNIT_TABLE() \
928 . = ALIGN(8); \
929 BOUNDED_SECTION_POST_LABEL(.kunit_test_suites, __kunit_suites, _start, _end)
930
931/* Alignment must be consistent with (kunit_suite *) in include/kunit/test.h */
932#define KUNIT_INIT_TABLE() \
933 . = ALIGN(8); \
934 BOUNDED_SECTION_POST_LABEL(.kunit_init_test_suites, \
935 __kunit_init_suites, _start, _end)
936
937#ifdef CONFIG_BLK_DEV_INITRD
938#define INIT_RAM_FS \
939 . = ALIGN(4); \
940 __initramfs_start = .; \
941 KEEP(*(.init.ramfs)) \
942 . = ALIGN(8); \
943 KEEP(*(.init.ramfs.info))
944#else
945#define INIT_RAM_FS
946#endif
947
948/*
949 * Memory encryption operates on a page basis. Since we need to clear
950 * the memory encryption mask for this section, it needs to be aligned
951 * on a page boundary and be a page-size multiple in length.
952 *
953 * Note: We use a separate section so that only this section gets
954 * decrypted to avoid exposing more than we wish.
955 */
956#ifdef CONFIG_AMD_MEM_ENCRYPT
957#define PERCPU_DECRYPTED_SECTION \
958 . = ALIGN(PAGE_SIZE); \
959 *(.data..percpu..decrypted) \
960 . = ALIGN(PAGE_SIZE);
961#else
962#define PERCPU_DECRYPTED_SECTION
963#endif
964
965
966/*
967 * Default discarded sections.
968 *
969 * Some archs want to discard exit text/data at runtime rather than
970 * link time due to cross-section references such as alt instructions,
971 * bug table, eh_frame, etc. DISCARDS must be the last of output
972 * section definitions so that such archs put those in earlier section
973 * definitions.
974 */
975#ifdef RUNTIME_DISCARD_EXIT
976#define EXIT_DISCARDS
977#else
978#define EXIT_DISCARDS \
979 EXIT_TEXT \
980 EXIT_DATA
981#endif
982
983/*
984 * Clang's -fprofile-arcs, -fsanitize=kernel-address, and
985 * -fsanitize=thread produce unwanted sections (.eh_frame
986 * and .init_array.*), but CONFIG_CONSTRUCTORS wants to
987 * keep any .init_array.* sections.
988 * https://llvm.org/pr46478
989 */
990#ifdef CONFIG_UNWIND_TABLES
991#define DISCARD_EH_FRAME
992#else
993#define DISCARD_EH_FRAME *(.eh_frame)
994#endif
995#if defined(CONFIG_GCOV_KERNEL) || defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KCSAN)
996# ifdef CONFIG_CONSTRUCTORS
997# define SANITIZER_DISCARDS \
998 DISCARD_EH_FRAME
999# else
1000# define SANITIZER_DISCARDS \
1001 *(.init_array) *(.init_array.*) \
1002 DISCARD_EH_FRAME
1003# endif
1004#else
1005# define SANITIZER_DISCARDS
1006#endif
1007
1008#define COMMON_DISCARDS \
1009 SANITIZER_DISCARDS \
1010 PATCHABLE_DISCARDS \
1011 *(.discard) \
1012 *(.discard.*) \
1013 *(.export_symbol) \
1014 *(.modinfo) \
1015 /* ld.bfd warns about .gnu.version* even when not emitted */ \
1016 *(.gnu.version*) \
1017
1018#define DISCARDS \
1019 /DISCARD/ : { \
1020 EXIT_DISCARDS \
1021 EXIT_CALL \
1022 COMMON_DISCARDS \
1023 }
1024
1025/**
1026 * PERCPU_INPUT - the percpu input sections
1027 * @cacheline: cacheline size
1028 *
1029 * The core percpu section names and core symbols which do not rely
1030 * directly upon load addresses.
1031 *
1032 * @cacheline is used to align subsections to avoid false cacheline
1033 * sharing between subsections for different purposes.
1034 */
1035#define PERCPU_INPUT(cacheline) \
1036 __per_cpu_start = .; \
1037 *(.data..percpu..first) \
1038 . = ALIGN(PAGE_SIZE); \
1039 *(.data..percpu..page_aligned) \
1040 . = ALIGN(cacheline); \
1041 *(.data..percpu..read_mostly) \
1042 . = ALIGN(cacheline); \
1043 *(.data..percpu) \
1044 *(.data..percpu..shared_aligned) \
1045 PERCPU_DECRYPTED_SECTION \
1046 __per_cpu_end = .;
1047
1048/**
1049 * PERCPU_VADDR - define output section for percpu area
1050 * @cacheline: cacheline size
1051 * @vaddr: explicit base address (optional)
1052 * @phdr: destination PHDR (optional)
1053 *
1054 * Macro which expands to output section for percpu area.
1055 *
1056 * @cacheline is used to align subsections to avoid false cacheline
1057 * sharing between subsections for different purposes.
1058 *
1059 * If @vaddr is not blank, it specifies explicit base address and all
1060 * percpu symbols will be offset from the given address. If blank,
1061 * @vaddr always equals @laddr + LOAD_OFFSET.
1062 *
1063 * @phdr defines the output PHDR to use if not blank. Be warned that
1064 * output PHDR is sticky. If @phdr is specified, the next output
1065 * section in the linker script will go there too. @phdr should have
1066 * a leading colon.
1067 *
1068 * Note that this macros defines __per_cpu_load as an absolute symbol.
1069 * If there is no need to put the percpu section at a predetermined
1070 * address, use PERCPU_SECTION.
1071 */
1072#define PERCPU_VADDR(cacheline, vaddr, phdr) \
1073 __per_cpu_load = .; \
1074 .data..percpu vaddr : AT(__per_cpu_load - LOAD_OFFSET) { \
1075 PERCPU_INPUT(cacheline) \
1076 } phdr \
1077 . = __per_cpu_load + SIZEOF(.data..percpu);
1078
1079/**
1080 * PERCPU_SECTION - define output section for percpu area, simple version
1081 * @cacheline: cacheline size
1082 *
1083 * Align to PAGE_SIZE and outputs output section for percpu area. This
1084 * macro doesn't manipulate @vaddr or @phdr and __per_cpu_load and
1085 * __per_cpu_start will be identical.
1086 *
1087 * This macro is equivalent to ALIGN(PAGE_SIZE); PERCPU_VADDR(@cacheline,,)
1088 * except that __per_cpu_load is defined as a relative symbol against
1089 * .data..percpu which is required for relocatable x86_32 configuration.
1090 */
1091#define PERCPU_SECTION(cacheline) \
1092 . = ALIGN(PAGE_SIZE); \
1093 .data..percpu : AT(ADDR(.data..percpu) - LOAD_OFFSET) { \
1094 __per_cpu_load = .; \
1095 PERCPU_INPUT(cacheline) \
1096 }
1097
1098
1099/*
1100 * Definition of the high level *_SECTION macros
1101 * They will fit only a subset of the architectures
1102 */
1103
1104
1105/*
1106 * Writeable data.
1107 * All sections are combined in a single .data section.
1108 * The sections following CONSTRUCTORS are arranged so their
1109 * typical alignment matches.
1110 * A cacheline is typical/always less than a PAGE_SIZE so
1111 * the sections that has this restriction (or similar)
1112 * is located before the ones requiring PAGE_SIZE alignment.
1113 * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which
1114 * matches the requirement of PAGE_ALIGNED_DATA.
1115 *
1116 * use 0 as page_align if page_aligned data is not used */
1117#define RW_DATA(cacheline, pagealigned, inittask) \
1118 . = ALIGN(PAGE_SIZE); \
1119 .data : AT(ADDR(.data) - LOAD_OFFSET) { \
1120 INIT_TASK_DATA(inittask) \
1121 NOSAVE_DATA \
1122 PAGE_ALIGNED_DATA(pagealigned) \
1123 CACHELINE_ALIGNED_DATA(cacheline) \
1124 READ_MOSTLY_DATA(cacheline) \
1125 DATA_DATA \
1126 CONSTRUCTORS \
1127 } \
1128 BUG_TABLE \
1129
1130#define INIT_TEXT_SECTION(inittext_align) \
1131 . = ALIGN(inittext_align); \
1132 .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) { \
1133 _sinittext = .; \
1134 INIT_TEXT \
1135 _einittext = .; \
1136 }
1137
1138#define INIT_DATA_SECTION(initsetup_align) \
1139 .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) { \
1140 INIT_DATA \
1141 INIT_SETUP(initsetup_align) \
1142 INIT_CALLS \
1143 CON_INITCALL \
1144 INIT_RAM_FS \
1145 }
1146
1147#define BSS_SECTION(sbss_align, bss_align, stop_align) \
1148 . = ALIGN(sbss_align); \
1149 __bss_start = .; \
1150 SBSS(sbss_align) \
1151 BSS(bss_align) \
1152 . = ALIGN(stop_align); \
1153 __bss_stop = .;