2 * Helper macros to support writing architecture specific
5 * A minimal linker scripts has following content:
6 * [This is a sample, architectures may have special requiriements]
16 * INIT_TEXT_SECTION(PAGE_SIZE)
17 * INIT_DATA_SECTION(...)
18 * PERCPU_SECTION(CACHELINE_SIZE)
30 * EXCEPTION_TABLE(...)
32 * BSS_SECTION(0, 0, 0)
39 * DISCARDS // must be the last
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
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
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.
66 #define NOTES_HEADERS :text :note
67 #define NOTES_HEADERS_RESTORE __restore_ph : { *(.__restore_ph) } :text
70 #define NOTES_HEADERS_RESTORE
74 * Some architectures have non-executable read-only exception tables.
75 * They can be added to the RO_DATA segment by specifying their desired
78 #ifdef RO_EXCEPTION_TABLE_ALIGN
79 #define RO_EXCEPTION_TABLE EXCEPTION_TABLE(RO_EXCEPTION_TABLE_ALIGN)
81 #define RO_EXCEPTION_TABLE
84 /* Align . to a 8 byte boundary equals to maximum function alignment. */
85 #define ALIGN_FUNCTION() . = ALIGN(8)
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.
93 * RODATA_MAIN is not used because existing code already defines .rodata.x
94 * sections to be brought in with rodata.
96 #ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
97 #define TEXT_MAIN .text .text.[0-9a-zA-Z_]*
98 #define DATA_MAIN .data .data.[0-9a-zA-Z_]* .data..LPBX*
99 #define SDATA_MAIN .sdata .sdata.[0-9a-zA-Z_]*
100 #define RODATA_MAIN .rodata .rodata.[0-9a-zA-Z_]*
101 #define BSS_MAIN .bss .bss.[0-9a-zA-Z_]*
102 #define SBSS_MAIN .sbss .sbss.[0-9a-zA-Z_]*
104 #define TEXT_MAIN .text
105 #define DATA_MAIN .data
106 #define SDATA_MAIN .sdata
107 #define RODATA_MAIN .rodata
108 #define BSS_MAIN .bss
109 #define SBSS_MAIN .sbss
113 * GCC 4.5 and later have a 32 bytes section alignment for structures.
114 * Except GCC 4.9, that feels the need to align on 64 bytes.
116 #if __GNUC__ == 4 && __GNUC_MINOR__ == 9
117 #define STRUCT_ALIGNMENT 64
119 #define STRUCT_ALIGNMENT 32
121 #define STRUCT_ALIGN() . = ALIGN(STRUCT_ALIGNMENT)
124 * The order of the sched class addresses are important, as they are
125 * used to determine the order of the priority of each sched class in
126 * relation to each other.
130 __begin_sched_classes = .; \
131 *(__idle_sched_class) \
132 *(__fair_sched_class) \
133 *(__rt_sched_class) \
134 *(__dl_sched_class) \
135 *(__stop_sched_class) \
136 __end_sched_classes = .;
138 /* The actual configuration determine if the init/exit sections
139 * are handled as text/data or they can be discarded (which
140 * often happens at runtime)
142 #ifdef CONFIG_HOTPLUG_CPU
143 #define CPU_KEEP(sec) *(.cpu##sec)
144 #define CPU_DISCARD(sec)
146 #define CPU_KEEP(sec)
147 #define CPU_DISCARD(sec) *(.cpu##sec)
150 #if defined(CONFIG_MEMORY_HOTPLUG)
151 #define MEM_KEEP(sec) *(.mem##sec)
152 #define MEM_DISCARD(sec)
154 #define MEM_KEEP(sec)
155 #define MEM_DISCARD(sec) *(.mem##sec)
158 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
160 * The ftrace call sites are logged to a section whose name depends on the
161 * compiler option used. A given kernel image will only use one, AKA
162 * FTRACE_CALLSITE_SECTION. We capture all of them here to avoid header
163 * dependencies for FTRACE_CALLSITE_SECTION's definition.
165 * Need to also make ftrace_stub_graph point to ftrace_stub
166 * so that the same stub location may have different protocols
167 * and not mess up with C verifiers.
169 #define MCOUNT_REC() . = ALIGN(8); \
170 __start_mcount_loc = .; \
171 KEEP(*(__mcount_loc)) \
172 KEEP(*(__patchable_function_entries)) \
173 __stop_mcount_loc = .; \
174 ftrace_stub_graph = ftrace_stub;
176 # ifdef CONFIG_FUNCTION_TRACER
177 # define MCOUNT_REC() ftrace_stub_graph = ftrace_stub;
179 # define MCOUNT_REC()
183 #ifdef CONFIG_TRACE_BRANCH_PROFILING
184 #define LIKELY_PROFILE() __start_annotated_branch_profile = .; \
185 KEEP(*(_ftrace_annotated_branch)) \
186 __stop_annotated_branch_profile = .;
188 #define LIKELY_PROFILE()
191 #ifdef CONFIG_PROFILE_ALL_BRANCHES
192 #define BRANCH_PROFILE() __start_branch_profile = .; \
193 KEEP(*(_ftrace_branch)) \
194 __stop_branch_profile = .;
196 #define BRANCH_PROFILE()
199 #ifdef CONFIG_KPROBES
200 #define KPROBE_BLACKLIST() . = ALIGN(8); \
201 __start_kprobe_blacklist = .; \
202 KEEP(*(_kprobe_blacklist)) \
203 __stop_kprobe_blacklist = .;
205 #define KPROBE_BLACKLIST()
208 #ifdef CONFIG_FUNCTION_ERROR_INJECTION
209 #define ERROR_INJECT_WHITELIST() STRUCT_ALIGN(); \
210 __start_error_injection_whitelist = .; \
211 KEEP(*(_error_injection_whitelist)) \
212 __stop_error_injection_whitelist = .;
214 #define ERROR_INJECT_WHITELIST()
217 #ifdef CONFIG_EVENT_TRACING
218 #define FTRACE_EVENTS() . = ALIGN(8); \
219 __start_ftrace_events = .; \
220 KEEP(*(_ftrace_events)) \
221 __stop_ftrace_events = .; \
222 __start_ftrace_eval_maps = .; \
223 KEEP(*(_ftrace_eval_map)) \
224 __stop_ftrace_eval_maps = .;
226 #define FTRACE_EVENTS()
229 #ifdef CONFIG_TRACING
230 #define TRACE_PRINTKS() __start___trace_bprintk_fmt = .; \
231 KEEP(*(__trace_printk_fmt)) /* Trace_printk fmt' pointer */ \
232 __stop___trace_bprintk_fmt = .;
233 #define TRACEPOINT_STR() __start___tracepoint_str = .; \
234 KEEP(*(__tracepoint_str)) /* Trace_printk fmt' pointer */ \
235 __stop___tracepoint_str = .;
237 #define TRACE_PRINTKS()
238 #define TRACEPOINT_STR()
241 #ifdef CONFIG_FTRACE_SYSCALLS
242 #define TRACE_SYSCALLS() . = ALIGN(8); \
243 __start_syscalls_metadata = .; \
244 KEEP(*(__syscalls_metadata)) \
245 __stop_syscalls_metadata = .;
247 #define TRACE_SYSCALLS()
250 #ifdef CONFIG_BPF_EVENTS
251 #define BPF_RAW_TP() STRUCT_ALIGN(); \
252 __start__bpf_raw_tp = .; \
253 KEEP(*(__bpf_raw_tp_map)) \
254 __stop__bpf_raw_tp = .;
259 #ifdef CONFIG_SERIAL_EARLYCON
260 #define EARLYCON_TABLE() . = ALIGN(8); \
261 __earlycon_table = .; \
262 KEEP(*(__earlycon_table)) \
263 __earlycon_table_end = .;
265 #define EARLYCON_TABLE()
268 #ifdef CONFIG_SECURITY
269 #define LSM_TABLE() . = ALIGN(8); \
270 __start_lsm_info = .; \
271 KEEP(*(.lsm_info.init)) \
273 #define EARLY_LSM_TABLE() . = ALIGN(8); \
274 __start_early_lsm_info = .; \
275 KEEP(*(.early_lsm_info.init)) \
276 __end_early_lsm_info = .;
279 #define EARLY_LSM_TABLE()
282 #define ___OF_TABLE(cfg, name) _OF_TABLE_##cfg(name)
283 #define __OF_TABLE(cfg, name) ___OF_TABLE(cfg, name)
284 #define OF_TABLE(cfg, name) __OF_TABLE(IS_ENABLED(cfg), name)
285 #define _OF_TABLE_0(name)
286 #define _OF_TABLE_1(name) \
288 __##name##_of_table = .; \
289 KEEP(*(__##name##_of_table)) \
290 KEEP(*(__##name##_of_table_end))
292 #define TIMER_OF_TABLES() OF_TABLE(CONFIG_TIMER_OF, timer)
293 #define IRQCHIP_OF_MATCH_TABLE() OF_TABLE(CONFIG_IRQCHIP, irqchip)
294 #define CLK_OF_TABLES() OF_TABLE(CONFIG_COMMON_CLK, clk)
295 #define RESERVEDMEM_OF_TABLES() OF_TABLE(CONFIG_OF_RESERVED_MEM, reservedmem)
296 #define CPU_METHOD_OF_TABLES() OF_TABLE(CONFIG_SMP, cpu_method)
297 #define CPUIDLE_METHOD_OF_TABLES() OF_TABLE(CONFIG_CPU_IDLE, cpuidle_method)
300 #define ACPI_PROBE_TABLE(name) \
302 __##name##_acpi_probe_table = .; \
303 KEEP(*(__##name##_acpi_probe_table)) \
304 __##name##_acpi_probe_table_end = .;
306 #define ACPI_PROBE_TABLE(name)
309 #ifdef CONFIG_THERMAL
310 #define THERMAL_TABLE(name) \
312 __##name##_thermal_table = .; \
313 KEEP(*(__##name##_thermal_table)) \
314 __##name##_thermal_table_end = .;
316 #define THERMAL_TABLE(name)
319 #define KERNEL_DTB() \
322 KEEP(*(.dtb.init.rodata)) \
331 *(.data..decrypted) \
333 *(.data..shared_aligned) /* percpu related */ \
334 MEM_KEEP(init.data*) \
335 MEM_KEEP(exit.data*) \
342 /* implement dynamic printk debug */ \
344 __start___dyndbg = .; \
346 __stop___dyndbg = .; \
354 * Data section helpers
356 #define NOSAVE_DATA \
357 . = ALIGN(PAGE_SIZE); \
358 __nosave_begin = .; \
360 . = ALIGN(PAGE_SIZE); \
363 #define PAGE_ALIGNED_DATA(page_align) \
364 . = ALIGN(page_align); \
365 *(.data..page_aligned) \
366 . = ALIGN(page_align);
368 #define READ_MOSTLY_DATA(align) \
370 *(.data..read_mostly) \
373 #define CACHELINE_ALIGNED_DATA(align) \
375 *(.data..cacheline_aligned)
377 #define INIT_TASK_DATA(align) \
379 __start_init_task = .; \
380 init_thread_union = .; \
382 KEEP(*(.data..init_task)) \
383 KEEP(*(.data..init_thread_info)) \
384 . = __start_init_task + THREAD_SIZE; \
387 #define JUMP_TABLE_DATA \
389 __start___jump_table = .; \
390 KEEP(*(__jump_table)) \
391 __stop___jump_table = .;
393 #define STATIC_CALL_DATA \
395 __start_static_call_sites = .; \
396 KEEP(*(.static_call_sites)) \
397 __stop_static_call_sites = .; \
398 __start_static_call_tramp_key = .; \
399 KEEP(*(.static_call_tramp_key)) \
400 __stop_static_call_tramp_key = .;
403 * Allow architectures to handle ro_after_init data on their
404 * own by defining an empty RO_AFTER_INIT_DATA.
406 #ifndef RO_AFTER_INIT_DATA
407 #define RO_AFTER_INIT_DATA \
409 __start_ro_after_init = .; \
410 *(.data..ro_after_init) \
413 __end_ro_after_init = .;
419 #define RO_DATA(align) \
420 . = ALIGN((align)); \
421 .rodata : AT(ADDR(.rodata) - LOAD_OFFSET) { \
422 __start_rodata = .; \
423 *(.rodata) *(.rodata.*) \
425 RO_AFTER_INIT_DATA /* Read only after init */ \
427 __start___tracepoints_ptrs = .; \
428 KEEP(*(__tracepoints_ptrs)) /* Tracepoints: pointer array */ \
429 __stop___tracepoints_ptrs = .; \
430 *(__tracepoints_strings)/* Tracepoints: strings */ \
433 .rodata1 : AT(ADDR(.rodata1) - LOAD_OFFSET) { \
438 .pci_fixup : AT(ADDR(.pci_fixup) - LOAD_OFFSET) { \
439 __start_pci_fixups_early = .; \
440 KEEP(*(.pci_fixup_early)) \
441 __end_pci_fixups_early = .; \
442 __start_pci_fixups_header = .; \
443 KEEP(*(.pci_fixup_header)) \
444 __end_pci_fixups_header = .; \
445 __start_pci_fixups_final = .; \
446 KEEP(*(.pci_fixup_final)) \
447 __end_pci_fixups_final = .; \
448 __start_pci_fixups_enable = .; \
449 KEEP(*(.pci_fixup_enable)) \
450 __end_pci_fixups_enable = .; \
451 __start_pci_fixups_resume = .; \
452 KEEP(*(.pci_fixup_resume)) \
453 __end_pci_fixups_resume = .; \
454 __start_pci_fixups_resume_early = .; \
455 KEEP(*(.pci_fixup_resume_early)) \
456 __end_pci_fixups_resume_early = .; \
457 __start_pci_fixups_suspend = .; \
458 KEEP(*(.pci_fixup_suspend)) \
459 __end_pci_fixups_suspend = .; \
460 __start_pci_fixups_suspend_late = .; \
461 KEEP(*(.pci_fixup_suspend_late)) \
462 __end_pci_fixups_suspend_late = .; \
465 /* Built-in firmware blobs */ \
466 .builtin_fw : AT(ADDR(.builtin_fw) - LOAD_OFFSET) ALIGN(8) { \
467 __start_builtin_fw = .; \
468 KEEP(*(.builtin_fw)) \
469 __end_builtin_fw = .; \
474 /* Kernel symbol table: Normal symbols */ \
475 __ksymtab : AT(ADDR(__ksymtab) - LOAD_OFFSET) { \
476 __start___ksymtab = .; \
477 KEEP(*(SORT(___ksymtab+*))) \
478 __stop___ksymtab = .; \
481 /* Kernel symbol table: GPL-only symbols */ \
482 __ksymtab_gpl : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) { \
483 __start___ksymtab_gpl = .; \
484 KEEP(*(SORT(___ksymtab_gpl+*))) \
485 __stop___ksymtab_gpl = .; \
488 /* Kernel symbol table: Normal unused symbols */ \
489 __ksymtab_unused : AT(ADDR(__ksymtab_unused) - LOAD_OFFSET) { \
490 __start___ksymtab_unused = .; \
491 KEEP(*(SORT(___ksymtab_unused+*))) \
492 __stop___ksymtab_unused = .; \
495 /* Kernel symbol table: GPL-only unused symbols */ \
496 __ksymtab_unused_gpl : AT(ADDR(__ksymtab_unused_gpl) - LOAD_OFFSET) { \
497 __start___ksymtab_unused_gpl = .; \
498 KEEP(*(SORT(___ksymtab_unused_gpl+*))) \
499 __stop___ksymtab_unused_gpl = .; \
502 /* Kernel symbol table: GPL-future-only symbols */ \
503 __ksymtab_gpl_future : AT(ADDR(__ksymtab_gpl_future) - LOAD_OFFSET) { \
504 __start___ksymtab_gpl_future = .; \
505 KEEP(*(SORT(___ksymtab_gpl_future+*))) \
506 __stop___ksymtab_gpl_future = .; \
509 /* Kernel symbol table: Normal symbols */ \
510 __kcrctab : AT(ADDR(__kcrctab) - LOAD_OFFSET) { \
511 __start___kcrctab = .; \
512 KEEP(*(SORT(___kcrctab+*))) \
513 __stop___kcrctab = .; \
516 /* Kernel symbol table: GPL-only symbols */ \
517 __kcrctab_gpl : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) { \
518 __start___kcrctab_gpl = .; \
519 KEEP(*(SORT(___kcrctab_gpl+*))) \
520 __stop___kcrctab_gpl = .; \
523 /* Kernel symbol table: Normal unused symbols */ \
524 __kcrctab_unused : AT(ADDR(__kcrctab_unused) - LOAD_OFFSET) { \
525 __start___kcrctab_unused = .; \
526 KEEP(*(SORT(___kcrctab_unused+*))) \
527 __stop___kcrctab_unused = .; \
530 /* Kernel symbol table: GPL-only unused symbols */ \
531 __kcrctab_unused_gpl : AT(ADDR(__kcrctab_unused_gpl) - LOAD_OFFSET) { \
532 __start___kcrctab_unused_gpl = .; \
533 KEEP(*(SORT(___kcrctab_unused_gpl+*))) \
534 __stop___kcrctab_unused_gpl = .; \
537 /* Kernel symbol table: GPL-future-only symbols */ \
538 __kcrctab_gpl_future : AT(ADDR(__kcrctab_gpl_future) - LOAD_OFFSET) { \
539 __start___kcrctab_gpl_future = .; \
540 KEEP(*(SORT(___kcrctab_gpl_future+*))) \
541 __stop___kcrctab_gpl_future = .; \
544 /* Kernel symbol table: strings */ \
545 __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \
546 *(__ksymtab_strings) \
549 /* __*init sections */ \
550 __init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) { \
552 MEM_KEEP(init.rodata) \
553 MEM_KEEP(exit.rodata) \
556 /* Built-in module parameters. */ \
557 __param : AT(ADDR(__param) - LOAD_OFFSET) { \
558 __start___param = .; \
560 __stop___param = .; \
563 /* Built-in module versions. */ \
564 __modver : AT(ADDR(__modver) - LOAD_OFFSET) { \
565 __start___modver = .; \
567 __stop___modver = .; \
574 . = ALIGN((align)); \
578 * Non-instrumentable text section
580 #define NOINSTR_TEXT \
582 __noinstr_text_start = .; \
584 __noinstr_text_end = .;
587 * .text section. Map to function alignment to avoid address changes
588 * during second ld run in second ld pass when generating System.map
590 * TEXT_MAIN here will match .text.fixup and .text.unlikely if dead
591 * code elimination is enabled, so these sections should be converted
596 *(.text.hot .text.hot.*) \
597 *(TEXT_MAIN .text.fixup) \
598 *(.text.unlikely .text.unlikely.*) \
599 *(.text.unknown .text.unknown.*) \
603 *(.text.asan.* .text.tsan.*) \
604 MEM_KEEP(init.text*) \
605 MEM_KEEP(exit.text*) \
608 /* sched.text is aling to function alignment to secure we have same
609 * address even at second ld pass when generating System.map */
612 __sched_text_start = .; \
614 __sched_text_end = .;
616 /* spinlock.text is aling to function alignment to secure we have same
617 * address even at second ld pass when generating System.map */
620 __lock_text_start = .; \
624 #define CPUIDLE_TEXT \
626 __cpuidle_text_start = .; \
628 __cpuidle_text_end = .;
630 #define KPROBES_TEXT \
632 __kprobes_text_start = .; \
634 __kprobes_text_end = .;
638 __entry_text_start = .; \
640 __entry_text_end = .;
642 #define IRQENTRY_TEXT \
644 __irqentry_text_start = .; \
646 __irqentry_text_end = .;
648 #define SOFTIRQENTRY_TEXT \
650 __softirqentry_text_start = .; \
651 *(.softirqentry.text) \
652 __softirqentry_text_end = .;
654 #define STATIC_CALL_TEXT \
656 __static_call_text_start = .; \
657 *(.static_call.text) \
658 __static_call_text_end = .;
660 /* Section used for early init (in .S files) */
661 #define HEAD_TEXT KEEP(*(.head.text))
663 #define HEAD_TEXT_SECTION \
664 .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) { \
671 #define EXCEPTION_TABLE(align) \
673 __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) { \
674 __start___ex_table = .; \
675 KEEP(*(__ex_table)) \
676 __stop___ex_table = .; \
682 #ifdef CONFIG_DEBUG_INFO_BTF
684 .BTF : AT(ADDR(.BTF) - LOAD_OFFSET) { \
690 .BTF_ids : AT(ADDR(.BTF_ids) - LOAD_OFFSET) { \
700 #define INIT_TASK_DATA_SECTION(align) \
702 .data..init_task : AT(ADDR(.data..init_task) - LOAD_OFFSET) { \
703 INIT_TASK_DATA(align) \
706 #ifdef CONFIG_CONSTRUCTORS
707 #define KERNEL_CTORS() . = ALIGN(8); \
709 KEEP(*(SORT(.ctors.*))) \
711 KEEP(*(SORT(.init_array.*))) \
712 KEEP(*(.init_array)) \
715 #define KERNEL_CTORS()
718 /* init and exit section handling */
720 KEEP(*(SORT(___kentry+*))) \
721 *(.init.data init.data.*) \
722 MEM_DISCARD(init.data*) \
725 *(.init.rodata .init.rodata.*) \
729 ERROR_INJECT_WHITELIST() \
730 MEM_DISCARD(init.rodata) \
732 RESERVEDMEM_OF_TABLES() \
734 CPU_METHOD_OF_TABLES() \
735 CPUIDLE_METHOD_OF_TABLES() \
737 IRQCHIP_OF_MATCH_TABLE() \
738 ACPI_PROBE_TABLE(irqchip) \
739 ACPI_PROBE_TABLE(timer) \
740 THERMAL_TABLE(governor) \
747 *(.init.text .init.text.*) \
749 MEM_DISCARD(init.text*)
752 *(.exit.data .exit.data.*) \
753 *(.fini_array .fini_array.*) \
755 MEM_DISCARD(exit.data*) \
756 MEM_DISCARD(exit.rodata*)
761 MEM_DISCARD(exit.text)
767 * bss (Block Started by Symbol) - uninitialized data
768 * zeroed during startup
770 #define SBSS(sbss_align) \
771 . = ALIGN(sbss_align); \
772 .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) { \
779 * Allow archectures to redefine BSS_FIRST_SECTIONS to add extra
780 * sections to the front of bss.
782 #ifndef BSS_FIRST_SECTIONS
783 #define BSS_FIRST_SECTIONS
786 #define BSS(bss_align) \
787 . = ALIGN(bss_align); \
788 .bss : AT(ADDR(.bss) - LOAD_OFFSET) { \
790 . = ALIGN(PAGE_SIZE); \
791 *(.bss..page_aligned) \
792 . = ALIGN(PAGE_SIZE); \
799 * DWARF debug sections.
800 * Symbols in the DWARF debugging sections are relative to
801 * the beginning of the section so we begin them at 0.
803 #define DWARF_DEBUG \
805 .debug 0 : { *(.debug) } \
806 .line 0 : { *(.line) } \
807 /* GNU DWARF 1 extensions */ \
808 .debug_srcinfo 0 : { *(.debug_srcinfo) } \
809 .debug_sfnames 0 : { *(.debug_sfnames) } \
810 /* DWARF 1.1 and DWARF 2 */ \
811 .debug_aranges 0 : { *(.debug_aranges) } \
812 .debug_pubnames 0 : { *(.debug_pubnames) } \
814 .debug_info 0 : { *(.debug_info \
815 .gnu.linkonce.wi.*) } \
816 .debug_abbrev 0 : { *(.debug_abbrev) } \
817 .debug_line 0 : { *(.debug_line) } \
818 .debug_frame 0 : { *(.debug_frame) } \
819 .debug_str 0 : { *(.debug_str) } \
820 .debug_loc 0 : { *(.debug_loc) } \
821 .debug_macinfo 0 : { *(.debug_macinfo) } \
822 .debug_pubtypes 0 : { *(.debug_pubtypes) } \
824 .debug_ranges 0 : { *(.debug_ranges) } \
825 /* SGI/MIPS DWARF 2 extensions */ \
826 .debug_weaknames 0 : { *(.debug_weaknames) } \
827 .debug_funcnames 0 : { *(.debug_funcnames) } \
828 .debug_typenames 0 : { *(.debug_typenames) } \
829 .debug_varnames 0 : { *(.debug_varnames) } \
830 /* GNU DWARF 2 extensions */ \
831 .debug_gnu_pubnames 0 : { *(.debug_gnu_pubnames) } \
832 .debug_gnu_pubtypes 0 : { *(.debug_gnu_pubtypes) } \
834 .debug_types 0 : { *(.debug_types) } \
836 .debug_addr 0 : { *(.debug_addr) } \
837 .debug_line_str 0 : { *(.debug_line_str) } \
838 .debug_loclists 0 : { *(.debug_loclists) } \
839 .debug_macro 0 : { *(.debug_macro) } \
840 .debug_names 0 : { *(.debug_names) } \
841 .debug_rnglists 0 : { *(.debug_rnglists) } \
842 .debug_str_offsets 0 : { *(.debug_str_offsets) }
844 /* Stabs debugging sections. */
845 #define STABS_DEBUG \
846 .stab 0 : { *(.stab) } \
847 .stabstr 0 : { *(.stabstr) } \
848 .stab.excl 0 : { *(.stab.excl) } \
849 .stab.exclstr 0 : { *(.stab.exclstr) } \
850 .stab.index 0 : { *(.stab.index) } \
851 .stab.indexstr 0 : { *(.stab.indexstr) }
853 /* Required sections not related to debugging. */
854 #define ELF_DETAILS \
855 .comment 0 : { *(.comment) } \
856 .symtab 0 : { *(.symtab) } \
857 .strtab 0 : { *(.strtab) } \
858 .shstrtab 0 : { *(.shstrtab) }
860 #ifdef CONFIG_GENERIC_BUG
863 __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) { \
864 __start___bug_table = .; \
865 KEEP(*(__bug_table)) \
866 __stop___bug_table = .; \
872 #ifdef CONFIG_UNWINDER_ORC
873 #define ORC_UNWIND_TABLE \
875 .orc_unwind_ip : AT(ADDR(.orc_unwind_ip) - LOAD_OFFSET) { \
876 __start_orc_unwind_ip = .; \
877 KEEP(*(.orc_unwind_ip)) \
878 __stop_orc_unwind_ip = .; \
881 .orc_unwind : AT(ADDR(.orc_unwind) - LOAD_OFFSET) { \
882 __start_orc_unwind = .; \
883 KEEP(*(.orc_unwind)) \
884 __stop_orc_unwind = .; \
887 .orc_lookup : AT(ADDR(.orc_lookup) - LOAD_OFFSET) { \
889 . += (((SIZEOF(.text) + LOOKUP_BLOCK_SIZE - 1) / \
890 LOOKUP_BLOCK_SIZE) + 1) * 4; \
891 orc_lookup_end = .; \
894 #define ORC_UNWIND_TABLE
897 #ifdef CONFIG_PM_TRACE
900 .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) { \
901 __tracedata_start = .; \
902 KEEP(*(.tracedata)) \
903 __tracedata_end = .; \
910 * Discard .note.GNU-stack, which is emitted as PROGBITS by the compiler.
911 * Otherwise, the type of .notes section would become PROGBITS instead of NOTES.
914 /DISCARD/ : { *(.note.GNU-stack) } \
915 .notes : AT(ADDR(.notes) - LOAD_OFFSET) { \
920 NOTES_HEADERS_RESTORE
922 #define INIT_SETUP(initsetup_align) \
923 . = ALIGN(initsetup_align); \
925 KEEP(*(.init.setup)) \
928 #define INIT_CALLS_LEVEL(level) \
929 __initcall##level##_start = .; \
930 KEEP(*(.initcall##level##.init)) \
931 KEEP(*(.initcall##level##s.init)) \
934 __initcall_start = .; \
935 KEEP(*(.initcallearly.init)) \
936 INIT_CALLS_LEVEL(0) \
937 INIT_CALLS_LEVEL(1) \
938 INIT_CALLS_LEVEL(2) \
939 INIT_CALLS_LEVEL(3) \
940 INIT_CALLS_LEVEL(4) \
941 INIT_CALLS_LEVEL(5) \
942 INIT_CALLS_LEVEL(rootfs) \
943 INIT_CALLS_LEVEL(6) \
944 INIT_CALLS_LEVEL(7) \
947 #define CON_INITCALL \
948 __con_initcall_start = .; \
949 KEEP(*(.con_initcall.init)) \
950 __con_initcall_end = .;
952 /* Alignment must be consistent with (kunit_suite *) in include/kunit/test.h */
953 #define KUNIT_TABLE() \
955 __kunit_suites_start = .; \
956 KEEP(*(.kunit_test_suites)) \
957 __kunit_suites_end = .;
959 #ifdef CONFIG_BLK_DEV_INITRD
960 #define INIT_RAM_FS \
962 __initramfs_start = .; \
963 KEEP(*(.init.ramfs)) \
965 KEEP(*(.init.ramfs.info))
971 * Memory encryption operates on a page basis. Since we need to clear
972 * the memory encryption mask for this section, it needs to be aligned
973 * on a page boundary and be a page-size multiple in length.
975 * Note: We use a separate section so that only this section gets
976 * decrypted to avoid exposing more than we wish.
978 #ifdef CONFIG_AMD_MEM_ENCRYPT
979 #define PERCPU_DECRYPTED_SECTION \
980 . = ALIGN(PAGE_SIZE); \
981 *(.data..percpu..decrypted) \
982 . = ALIGN(PAGE_SIZE);
984 #define PERCPU_DECRYPTED_SECTION
989 * Default discarded sections.
991 * Some archs want to discard exit text/data at runtime rather than
992 * link time due to cross-section references such as alt instructions,
993 * bug table, eh_frame, etc. DISCARDS must be the last of output
994 * section definitions so that such archs put those in earlier section
997 #ifdef RUNTIME_DISCARD_EXIT
998 #define EXIT_DISCARDS
1000 #define EXIT_DISCARDS \
1006 * Clang's -fprofile-arcs, -fsanitize=kernel-address, and
1007 * -fsanitize=thread produce unwanted sections (.eh_frame
1008 * and .init_array.*), but CONFIG_CONSTRUCTORS wants to
1009 * keep any .init_array.* sections.
1010 * https://bugs.llvm.org/show_bug.cgi?id=46478
1012 #if defined(CONFIG_GCOV_KERNEL) || defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KCSAN)
1013 # ifdef CONFIG_CONSTRUCTORS
1014 # define SANITIZER_DISCARDS \
1017 # define SANITIZER_DISCARDS \
1018 *(.init_array) *(.init_array.*) \
1022 # define SANITIZER_DISCARDS
1025 #define COMMON_DISCARDS \
1026 SANITIZER_DISCARDS \
1030 /* ld.bfd warns about .gnu.version* even when not emitted */ \
1041 * PERCPU_INPUT - the percpu input sections
1042 * @cacheline: cacheline size
1044 * The core percpu section names and core symbols which do not rely
1045 * directly upon load addresses.
1047 * @cacheline is used to align subsections to avoid false cacheline
1048 * sharing between subsections for different purposes.
1050 #define PERCPU_INPUT(cacheline) \
1051 __per_cpu_start = .; \
1052 *(.data..percpu..first) \
1053 . = ALIGN(PAGE_SIZE); \
1054 *(.data..percpu..page_aligned) \
1055 . = ALIGN(cacheline); \
1056 *(.data..percpu..read_mostly) \
1057 . = ALIGN(cacheline); \
1059 *(.data..percpu..shared_aligned) \
1060 PERCPU_DECRYPTED_SECTION \
1064 * PERCPU_VADDR - define output section for percpu area
1065 * @cacheline: cacheline size
1066 * @vaddr: explicit base address (optional)
1067 * @phdr: destination PHDR (optional)
1069 * Macro which expands to output section for percpu area.
1071 * @cacheline is used to align subsections to avoid false cacheline
1072 * sharing between subsections for different purposes.
1074 * If @vaddr is not blank, it specifies explicit base address and all
1075 * percpu symbols will be offset from the given address. If blank,
1076 * @vaddr always equals @laddr + LOAD_OFFSET.
1078 * @phdr defines the output PHDR to use if not blank. Be warned that
1079 * output PHDR is sticky. If @phdr is specified, the next output
1080 * section in the linker script will go there too. @phdr should have
1083 * Note that this macros defines __per_cpu_load as an absolute symbol.
1084 * If there is no need to put the percpu section at a predetermined
1085 * address, use PERCPU_SECTION.
1087 #define PERCPU_VADDR(cacheline, vaddr, phdr) \
1088 __per_cpu_load = .; \
1089 .data..percpu vaddr : AT(__per_cpu_load - LOAD_OFFSET) { \
1090 PERCPU_INPUT(cacheline) \
1092 . = __per_cpu_load + SIZEOF(.data..percpu);
1095 * PERCPU_SECTION - define output section for percpu area, simple version
1096 * @cacheline: cacheline size
1098 * Align to PAGE_SIZE and outputs output section for percpu area. This
1099 * macro doesn't manipulate @vaddr or @phdr and __per_cpu_load and
1100 * __per_cpu_start will be identical.
1102 * This macro is equivalent to ALIGN(PAGE_SIZE); PERCPU_VADDR(@cacheline,,)
1103 * except that __per_cpu_load is defined as a relative symbol against
1104 * .data..percpu which is required for relocatable x86_32 configuration.
1106 #define PERCPU_SECTION(cacheline) \
1107 . = ALIGN(PAGE_SIZE); \
1108 .data..percpu : AT(ADDR(.data..percpu) - LOAD_OFFSET) { \
1109 __per_cpu_load = .; \
1110 PERCPU_INPUT(cacheline) \
1115 * Definition of the high level *_SECTION macros
1116 * They will fit only a subset of the architectures
1122 * All sections are combined in a single .data section.
1123 * The sections following CONSTRUCTORS are arranged so their
1124 * typical alignment matches.
1125 * A cacheline is typical/always less than a PAGE_SIZE so
1126 * the sections that has this restriction (or similar)
1127 * is located before the ones requiring PAGE_SIZE alignment.
1128 * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which
1129 * matches the requirement of PAGE_ALIGNED_DATA.
1131 * use 0 as page_align if page_aligned data is not used */
1132 #define RW_DATA(cacheline, pagealigned, inittask) \
1133 . = ALIGN(PAGE_SIZE); \
1134 .data : AT(ADDR(.data) - LOAD_OFFSET) { \
1135 INIT_TASK_DATA(inittask) \
1137 PAGE_ALIGNED_DATA(pagealigned) \
1138 CACHELINE_ALIGNED_DATA(cacheline) \
1139 READ_MOSTLY_DATA(cacheline) \
1145 #define INIT_TEXT_SECTION(inittext_align) \
1146 . = ALIGN(inittext_align); \
1147 .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) { \
1153 #define INIT_DATA_SECTION(initsetup_align) \
1154 .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) { \
1156 INIT_SETUP(initsetup_align) \
1162 #define BSS_SECTION(sbss_align, bss_align, stop_align) \
1163 . = ALIGN(sbss_align); \
1167 . = ALIGN(stop_align); \