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 * With LTO_CLANG, the linker also splits sections by default, so we need
94 * these macros to combine the sections during the final link.
96 * RODATA_MAIN is not used because existing code already defines .rodata.x
97 * sections to be brought in with rodata.
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_]*
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
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.
119 #if __GNUC__ == 4 && __GNUC_MINOR__ == 9
120 #define STRUCT_ALIGNMENT 64
122 #define STRUCT_ALIGNMENT 32
124 #define STRUCT_ALIGN() . = ALIGN(STRUCT_ALIGNMENT)
127 * The order of the sched class addresses are important, as they are
128 * used to determine the order of the priority of each sched class in
129 * relation to each other.
133 __begin_sched_classes = .; \
134 *(__idle_sched_class) \
135 *(__fair_sched_class) \
136 *(__rt_sched_class) \
137 *(__dl_sched_class) \
138 *(__stop_sched_class) \
139 __end_sched_classes = .;
141 /* The actual configuration determine if the init/exit sections
142 * are handled as text/data or they can be discarded (which
143 * often happens at runtime)
145 #ifdef CONFIG_HOTPLUG_CPU
146 #define CPU_KEEP(sec) *(.cpu##sec)
147 #define CPU_DISCARD(sec)
149 #define CPU_KEEP(sec)
150 #define CPU_DISCARD(sec) *(.cpu##sec)
153 #if defined(CONFIG_MEMORY_HOTPLUG)
154 #define MEM_KEEP(sec) *(.mem##sec)
155 #define MEM_DISCARD(sec)
157 #define MEM_KEEP(sec)
158 #define MEM_DISCARD(sec) *(.mem##sec)
161 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
163 * The ftrace call sites are logged to a section whose name depends on the
164 * compiler option used. A given kernel image will only use one, AKA
165 * FTRACE_CALLSITE_SECTION. We capture all of them here to avoid header
166 * dependencies for FTRACE_CALLSITE_SECTION's definition.
168 * Need to also make ftrace_stub_graph point to ftrace_stub
169 * so that the same stub location may have different protocols
170 * and not mess up with C verifiers.
172 #define MCOUNT_REC() . = ALIGN(8); \
173 __start_mcount_loc = .; \
174 KEEP(*(__mcount_loc)) \
175 KEEP(*(__patchable_function_entries)) \
176 __stop_mcount_loc = .; \
177 ftrace_stub_graph = ftrace_stub;
179 # ifdef CONFIG_FUNCTION_TRACER
180 # define MCOUNT_REC() ftrace_stub_graph = ftrace_stub;
182 # define MCOUNT_REC()
186 #ifdef CONFIG_TRACE_BRANCH_PROFILING
187 #define LIKELY_PROFILE() __start_annotated_branch_profile = .; \
188 KEEP(*(_ftrace_annotated_branch)) \
189 __stop_annotated_branch_profile = .;
191 #define LIKELY_PROFILE()
194 #ifdef CONFIG_PROFILE_ALL_BRANCHES
195 #define BRANCH_PROFILE() __start_branch_profile = .; \
196 KEEP(*(_ftrace_branch)) \
197 __stop_branch_profile = .;
199 #define BRANCH_PROFILE()
202 #ifdef CONFIG_KPROBES
203 #define KPROBE_BLACKLIST() . = ALIGN(8); \
204 __start_kprobe_blacklist = .; \
205 KEEP(*(_kprobe_blacklist)) \
206 __stop_kprobe_blacklist = .;
208 #define KPROBE_BLACKLIST()
211 #ifdef CONFIG_FUNCTION_ERROR_INJECTION
212 #define ERROR_INJECT_WHITELIST() STRUCT_ALIGN(); \
213 __start_error_injection_whitelist = .; \
214 KEEP(*(_error_injection_whitelist)) \
215 __stop_error_injection_whitelist = .;
217 #define ERROR_INJECT_WHITELIST()
220 #ifdef CONFIG_EVENT_TRACING
221 #define FTRACE_EVENTS() . = ALIGN(8); \
222 __start_ftrace_events = .; \
223 KEEP(*(_ftrace_events)) \
224 __stop_ftrace_events = .; \
225 __start_ftrace_eval_maps = .; \
226 KEEP(*(_ftrace_eval_map)) \
227 __stop_ftrace_eval_maps = .;
229 #define FTRACE_EVENTS()
232 #ifdef CONFIG_TRACING
233 #define TRACE_PRINTKS() __start___trace_bprintk_fmt = .; \
234 KEEP(*(__trace_printk_fmt)) /* Trace_printk fmt' pointer */ \
235 __stop___trace_bprintk_fmt = .;
236 #define TRACEPOINT_STR() __start___tracepoint_str = .; \
237 KEEP(*(__tracepoint_str)) /* Trace_printk fmt' pointer */ \
238 __stop___tracepoint_str = .;
240 #define TRACE_PRINTKS()
241 #define TRACEPOINT_STR()
244 #ifdef CONFIG_FTRACE_SYSCALLS
245 #define TRACE_SYSCALLS() . = ALIGN(8); \
246 __start_syscalls_metadata = .; \
247 KEEP(*(__syscalls_metadata)) \
248 __stop_syscalls_metadata = .;
250 #define TRACE_SYSCALLS()
253 #ifdef CONFIG_BPF_EVENTS
254 #define BPF_RAW_TP() STRUCT_ALIGN(); \
255 __start__bpf_raw_tp = .; \
256 KEEP(*(__bpf_raw_tp_map)) \
257 __stop__bpf_raw_tp = .;
262 #ifdef CONFIG_SERIAL_EARLYCON
263 #define EARLYCON_TABLE() . = ALIGN(8); \
264 __earlycon_table = .; \
265 KEEP(*(__earlycon_table)) \
266 __earlycon_table_end = .;
268 #define EARLYCON_TABLE()
271 #ifdef CONFIG_SECURITY
272 #define LSM_TABLE() . = ALIGN(8); \
273 __start_lsm_info = .; \
274 KEEP(*(.lsm_info.init)) \
276 #define EARLY_LSM_TABLE() . = ALIGN(8); \
277 __start_early_lsm_info = .; \
278 KEEP(*(.early_lsm_info.init)) \
279 __end_early_lsm_info = .;
282 #define EARLY_LSM_TABLE()
285 #define ___OF_TABLE(cfg, name) _OF_TABLE_##cfg(name)
286 #define __OF_TABLE(cfg, name) ___OF_TABLE(cfg, name)
287 #define OF_TABLE(cfg, name) __OF_TABLE(IS_ENABLED(cfg), name)
288 #define _OF_TABLE_0(name)
289 #define _OF_TABLE_1(name) \
291 __##name##_of_table = .; \
292 KEEP(*(__##name##_of_table)) \
293 KEEP(*(__##name##_of_table_end))
295 #define TIMER_OF_TABLES() OF_TABLE(CONFIG_TIMER_OF, timer)
296 #define IRQCHIP_OF_MATCH_TABLE() OF_TABLE(CONFIG_IRQCHIP, irqchip)
297 #define CLK_OF_TABLES() OF_TABLE(CONFIG_COMMON_CLK, clk)
298 #define RESERVEDMEM_OF_TABLES() OF_TABLE(CONFIG_OF_RESERVED_MEM, reservedmem)
299 #define CPU_METHOD_OF_TABLES() OF_TABLE(CONFIG_SMP, cpu_method)
300 #define CPUIDLE_METHOD_OF_TABLES() OF_TABLE(CONFIG_CPU_IDLE, cpuidle_method)
303 #define ACPI_PROBE_TABLE(name) \
305 __##name##_acpi_probe_table = .; \
306 KEEP(*(__##name##_acpi_probe_table)) \
307 __##name##_acpi_probe_table_end = .;
309 #define ACPI_PROBE_TABLE(name)
312 #ifdef CONFIG_THERMAL
313 #define THERMAL_TABLE(name) \
315 __##name##_thermal_table = .; \
316 KEEP(*(__##name##_thermal_table)) \
317 __##name##_thermal_table_end = .;
319 #define THERMAL_TABLE(name)
323 #define DTPM_TABLE() \
326 KEEP(*(__dtpm_table)) \
327 __dtpm_table_end = .;
332 #define KERNEL_DTB() \
335 KEEP(*(.dtb.init.rodata)) \
345 *(.data..shared_aligned) /* percpu related */ \
346 MEM_KEEP(init.data*) \
347 MEM_KEEP(exit.data*) \
354 /* implement dynamic printk debug */ \
356 __start___dyndbg = .; \
358 __stop___dyndbg = .; \
366 * Data section helpers
368 #define NOSAVE_DATA \
369 . = ALIGN(PAGE_SIZE); \
370 __nosave_begin = .; \
372 . = ALIGN(PAGE_SIZE); \
375 #define PAGE_ALIGNED_DATA(page_align) \
376 . = ALIGN(page_align); \
377 *(.data..page_aligned) \
378 . = ALIGN(page_align);
380 #define READ_MOSTLY_DATA(align) \
382 *(.data..read_mostly) \
385 #define CACHELINE_ALIGNED_DATA(align) \
387 *(.data..cacheline_aligned)
389 #define INIT_TASK_DATA(align) \
391 __start_init_task = .; \
392 init_thread_union = .; \
394 KEEP(*(.data..init_task)) \
395 KEEP(*(.data..init_thread_info)) \
396 . = __start_init_task + THREAD_SIZE; \
399 #define JUMP_TABLE_DATA \
401 __start___jump_table = .; \
402 KEEP(*(__jump_table)) \
403 __stop___jump_table = .;
405 #define STATIC_CALL_DATA \
407 __start_static_call_sites = .; \
408 KEEP(*(.static_call_sites)) \
409 __stop_static_call_sites = .; \
410 __start_static_call_tramp_key = .; \
411 KEEP(*(.static_call_tramp_key)) \
412 __stop_static_call_tramp_key = .;
415 * Allow architectures to handle ro_after_init data on their
416 * own by defining an empty RO_AFTER_INIT_DATA.
418 #ifndef RO_AFTER_INIT_DATA
419 #define RO_AFTER_INIT_DATA \
421 __start_ro_after_init = .; \
422 *(.data..ro_after_init) \
425 __end_ro_after_init = .;
431 #define RO_DATA(align) \
432 . = ALIGN((align)); \
433 .rodata : AT(ADDR(.rodata) - LOAD_OFFSET) { \
434 __start_rodata = .; \
435 *(.rodata) *(.rodata.*) \
437 RO_AFTER_INIT_DATA /* Read only after init */ \
439 __start___tracepoints_ptrs = .; \
440 KEEP(*(__tracepoints_ptrs)) /* Tracepoints: pointer array */ \
441 __stop___tracepoints_ptrs = .; \
442 *(__tracepoints_strings)/* Tracepoints: strings */ \
445 .rodata1 : AT(ADDR(.rodata1) - LOAD_OFFSET) { \
450 .pci_fixup : AT(ADDR(.pci_fixup) - LOAD_OFFSET) { \
451 __start_pci_fixups_early = .; \
452 KEEP(*(.pci_fixup_early)) \
453 __end_pci_fixups_early = .; \
454 __start_pci_fixups_header = .; \
455 KEEP(*(.pci_fixup_header)) \
456 __end_pci_fixups_header = .; \
457 __start_pci_fixups_final = .; \
458 KEEP(*(.pci_fixup_final)) \
459 __end_pci_fixups_final = .; \
460 __start_pci_fixups_enable = .; \
461 KEEP(*(.pci_fixup_enable)) \
462 __end_pci_fixups_enable = .; \
463 __start_pci_fixups_resume = .; \
464 KEEP(*(.pci_fixup_resume)) \
465 __end_pci_fixups_resume = .; \
466 __start_pci_fixups_resume_early = .; \
467 KEEP(*(.pci_fixup_resume_early)) \
468 __end_pci_fixups_resume_early = .; \
469 __start_pci_fixups_suspend = .; \
470 KEEP(*(.pci_fixup_suspend)) \
471 __end_pci_fixups_suspend = .; \
472 __start_pci_fixups_suspend_late = .; \
473 KEEP(*(.pci_fixup_suspend_late)) \
474 __end_pci_fixups_suspend_late = .; \
477 /* Built-in firmware blobs */ \
478 .builtin_fw : AT(ADDR(.builtin_fw) - LOAD_OFFSET) ALIGN(8) { \
479 __start_builtin_fw = .; \
480 KEEP(*(.builtin_fw)) \
481 __end_builtin_fw = .; \
486 /* Kernel symbol table: Normal symbols */ \
487 __ksymtab : AT(ADDR(__ksymtab) - LOAD_OFFSET) { \
488 __start___ksymtab = .; \
489 KEEP(*(SORT(___ksymtab+*))) \
490 __stop___ksymtab = .; \
493 /* Kernel symbol table: GPL-only symbols */ \
494 __ksymtab_gpl : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) { \
495 __start___ksymtab_gpl = .; \
496 KEEP(*(SORT(___ksymtab_gpl+*))) \
497 __stop___ksymtab_gpl = .; \
500 /* Kernel symbol table: Normal symbols */ \
501 __kcrctab : AT(ADDR(__kcrctab) - LOAD_OFFSET) { \
502 __start___kcrctab = .; \
503 KEEP(*(SORT(___kcrctab+*))) \
504 __stop___kcrctab = .; \
507 /* Kernel symbol table: GPL-only symbols */ \
508 __kcrctab_gpl : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) { \
509 __start___kcrctab_gpl = .; \
510 KEEP(*(SORT(___kcrctab_gpl+*))) \
511 __stop___kcrctab_gpl = .; \
514 /* Kernel symbol table: strings */ \
515 __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \
516 *(__ksymtab_strings) \
519 /* __*init sections */ \
520 __init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) { \
522 MEM_KEEP(init.rodata) \
523 MEM_KEEP(exit.rodata) \
526 /* Built-in module parameters. */ \
527 __param : AT(ADDR(__param) - LOAD_OFFSET) { \
528 __start___param = .; \
530 __stop___param = .; \
533 /* Built-in module versions. */ \
534 __modver : AT(ADDR(__modver) - LOAD_OFFSET) { \
535 __start___modver = .; \
537 __stop___modver = .; \
544 . = ALIGN((align)); \
549 * .text..L.cfi.jumptable.* contain Control-Flow Integrity (CFI)
550 * jump table entries.
552 #ifdef CONFIG_CFI_CLANG
553 #define TEXT_CFI_JT \
554 . = ALIGN(PMD_SIZE); \
555 __cfi_jt_start = .; \
556 *(.text..L.cfi.jumptable .text..L.cfi.jumptable.*) \
557 . = ALIGN(PMD_SIZE); \
564 * Non-instrumentable text section
566 #define NOINSTR_TEXT \
568 __noinstr_text_start = .; \
570 __noinstr_text_end = .;
573 * .text section. Map to function alignment to avoid address changes
574 * during second ld run in second ld pass when generating System.map
576 * TEXT_MAIN here will match .text.fixup and .text.unlikely if dead
577 * code elimination is enabled, so these sections should be converted
582 *(.text.hot .text.hot.*) \
583 *(TEXT_MAIN .text.fixup) \
584 *(.text.unlikely .text.unlikely.*) \
585 *(.text.unknown .text.unknown.*) \
590 MEM_KEEP(init.text*) \
591 MEM_KEEP(exit.text*) \
594 /* sched.text is aling to function alignment to secure we have same
595 * address even at second ld pass when generating System.map */
598 __sched_text_start = .; \
600 __sched_text_end = .;
602 /* spinlock.text is aling to function alignment to secure we have same
603 * address even at second ld pass when generating System.map */
606 __lock_text_start = .; \
610 #define CPUIDLE_TEXT \
612 __cpuidle_text_start = .; \
614 __cpuidle_text_end = .;
616 #define KPROBES_TEXT \
618 __kprobes_text_start = .; \
620 __kprobes_text_end = .;
624 __entry_text_start = .; \
626 __entry_text_end = .;
628 #define IRQENTRY_TEXT \
630 __irqentry_text_start = .; \
632 __irqentry_text_end = .;
634 #define SOFTIRQENTRY_TEXT \
636 __softirqentry_text_start = .; \
637 *(.softirqentry.text) \
638 __softirqentry_text_end = .;
640 #define STATIC_CALL_TEXT \
642 __static_call_text_start = .; \
643 *(.static_call.text) \
644 __static_call_text_end = .;
646 /* Section used for early init (in .S files) */
647 #define HEAD_TEXT KEEP(*(.head.text))
649 #define HEAD_TEXT_SECTION \
650 .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) { \
657 #define EXCEPTION_TABLE(align) \
659 __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) { \
660 __start___ex_table = .; \
661 KEEP(*(__ex_table)) \
662 __stop___ex_table = .; \
668 #ifdef CONFIG_DEBUG_INFO_BTF
670 .BTF : AT(ADDR(.BTF) - LOAD_OFFSET) { \
676 .BTF_ids : AT(ADDR(.BTF_ids) - LOAD_OFFSET) { \
686 #define INIT_TASK_DATA_SECTION(align) \
688 .data..init_task : AT(ADDR(.data..init_task) - LOAD_OFFSET) { \
689 INIT_TASK_DATA(align) \
692 #ifdef CONFIG_CONSTRUCTORS
693 #define KERNEL_CTORS() . = ALIGN(8); \
695 KEEP(*(SORT(.ctors.*))) \
697 KEEP(*(SORT(.init_array.*))) \
698 KEEP(*(.init_array)) \
701 #define KERNEL_CTORS()
704 /* init and exit section handling */
706 KEEP(*(SORT(___kentry+*))) \
707 *(.init.data init.data.*) \
708 MEM_DISCARD(init.data*) \
711 *(.init.rodata .init.rodata.*) \
715 ERROR_INJECT_WHITELIST() \
716 MEM_DISCARD(init.rodata) \
718 RESERVEDMEM_OF_TABLES() \
720 CPU_METHOD_OF_TABLES() \
721 CPUIDLE_METHOD_OF_TABLES() \
723 IRQCHIP_OF_MATCH_TABLE() \
724 ACPI_PROBE_TABLE(irqchip) \
725 ACPI_PROBE_TABLE(timer) \
726 THERMAL_TABLE(governor) \
734 *(.init.text .init.text.*) \
736 MEM_DISCARD(init.text*)
739 *(.exit.data .exit.data.*) \
740 *(.fini_array .fini_array.*) \
742 MEM_DISCARD(exit.data*) \
743 MEM_DISCARD(exit.rodata*)
748 MEM_DISCARD(exit.text)
754 * bss (Block Started by Symbol) - uninitialized data
755 * zeroed during startup
757 #define SBSS(sbss_align) \
758 . = ALIGN(sbss_align); \
759 .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) { \
766 * Allow archectures to redefine BSS_FIRST_SECTIONS to add extra
767 * sections to the front of bss.
769 #ifndef BSS_FIRST_SECTIONS
770 #define BSS_FIRST_SECTIONS
773 #define BSS(bss_align) \
774 . = ALIGN(bss_align); \
775 .bss : AT(ADDR(.bss) - LOAD_OFFSET) { \
777 . = ALIGN(PAGE_SIZE); \
778 *(.bss..page_aligned) \
779 . = ALIGN(PAGE_SIZE); \
786 * DWARF debug sections.
787 * Symbols in the DWARF debugging sections are relative to
788 * the beginning of the section so we begin them at 0.
790 #define DWARF_DEBUG \
792 .debug 0 : { *(.debug) } \
793 .line 0 : { *(.line) } \
794 /* GNU DWARF 1 extensions */ \
795 .debug_srcinfo 0 : { *(.debug_srcinfo) } \
796 .debug_sfnames 0 : { *(.debug_sfnames) } \
797 /* DWARF 1.1 and DWARF 2 */ \
798 .debug_aranges 0 : { *(.debug_aranges) } \
799 .debug_pubnames 0 : { *(.debug_pubnames) } \
801 .debug_info 0 : { *(.debug_info \
802 .gnu.linkonce.wi.*) } \
803 .debug_abbrev 0 : { *(.debug_abbrev) } \
804 .debug_line 0 : { *(.debug_line) } \
805 .debug_frame 0 : { *(.debug_frame) } \
806 .debug_str 0 : { *(.debug_str) } \
807 .debug_loc 0 : { *(.debug_loc) } \
808 .debug_macinfo 0 : { *(.debug_macinfo) } \
809 .debug_pubtypes 0 : { *(.debug_pubtypes) } \
811 .debug_ranges 0 : { *(.debug_ranges) } \
812 /* SGI/MIPS DWARF 2 extensions */ \
813 .debug_weaknames 0 : { *(.debug_weaknames) } \
814 .debug_funcnames 0 : { *(.debug_funcnames) } \
815 .debug_typenames 0 : { *(.debug_typenames) } \
816 .debug_varnames 0 : { *(.debug_varnames) } \
817 /* GNU DWARF 2 extensions */ \
818 .debug_gnu_pubnames 0 : { *(.debug_gnu_pubnames) } \
819 .debug_gnu_pubtypes 0 : { *(.debug_gnu_pubtypes) } \
821 .debug_types 0 : { *(.debug_types) } \
823 .debug_addr 0 : { *(.debug_addr) } \
824 .debug_line_str 0 : { *(.debug_line_str) } \
825 .debug_loclists 0 : { *(.debug_loclists) } \
826 .debug_macro 0 : { *(.debug_macro) } \
827 .debug_names 0 : { *(.debug_names) } \
828 .debug_rnglists 0 : { *(.debug_rnglists) } \
829 .debug_str_offsets 0 : { *(.debug_str_offsets) }
831 /* Stabs debugging sections. */
832 #define STABS_DEBUG \
833 .stab 0 : { *(.stab) } \
834 .stabstr 0 : { *(.stabstr) } \
835 .stab.excl 0 : { *(.stab.excl) } \
836 .stab.exclstr 0 : { *(.stab.exclstr) } \
837 .stab.index 0 : { *(.stab.index) } \
838 .stab.indexstr 0 : { *(.stab.indexstr) }
840 /* Required sections not related to debugging. */
841 #define ELF_DETAILS \
842 .comment 0 : { *(.comment) } \
843 .symtab 0 : { *(.symtab) } \
844 .strtab 0 : { *(.strtab) } \
845 .shstrtab 0 : { *(.shstrtab) }
847 #ifdef CONFIG_GENERIC_BUG
850 __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) { \
851 __start___bug_table = .; \
852 KEEP(*(__bug_table)) \
853 __stop___bug_table = .; \
859 #ifdef CONFIG_UNWINDER_ORC
860 #define ORC_UNWIND_TABLE \
862 .orc_unwind_ip : AT(ADDR(.orc_unwind_ip) - LOAD_OFFSET) { \
863 __start_orc_unwind_ip = .; \
864 KEEP(*(.orc_unwind_ip)) \
865 __stop_orc_unwind_ip = .; \
868 .orc_unwind : AT(ADDR(.orc_unwind) - LOAD_OFFSET) { \
869 __start_orc_unwind = .; \
870 KEEP(*(.orc_unwind)) \
871 __stop_orc_unwind = .; \
874 .orc_lookup : AT(ADDR(.orc_lookup) - LOAD_OFFSET) { \
876 . += (((SIZEOF(.text) + LOOKUP_BLOCK_SIZE - 1) / \
877 LOOKUP_BLOCK_SIZE) + 1) * 4; \
878 orc_lookup_end = .; \
881 #define ORC_UNWIND_TABLE
884 #ifdef CONFIG_PM_TRACE
887 .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) { \
888 __tracedata_start = .; \
889 KEEP(*(.tracedata)) \
890 __tracedata_end = .; \
897 .notes : AT(ADDR(.notes) - LOAD_OFFSET) { \
902 NOTES_HEADERS_RESTORE
904 #define INIT_SETUP(initsetup_align) \
905 . = ALIGN(initsetup_align); \
907 KEEP(*(.init.setup)) \
910 #define INIT_CALLS_LEVEL(level) \
911 __initcall##level##_start = .; \
912 KEEP(*(.initcall##level##.init)) \
913 KEEP(*(.initcall##level##s.init)) \
916 __initcall_start = .; \
917 KEEP(*(.initcallearly.init)) \
918 INIT_CALLS_LEVEL(0) \
919 INIT_CALLS_LEVEL(1) \
920 INIT_CALLS_LEVEL(2) \
921 INIT_CALLS_LEVEL(3) \
922 INIT_CALLS_LEVEL(4) \
923 INIT_CALLS_LEVEL(5) \
924 INIT_CALLS_LEVEL(rootfs) \
925 INIT_CALLS_LEVEL(6) \
926 INIT_CALLS_LEVEL(7) \
929 #define CON_INITCALL \
930 __con_initcall_start = .; \
931 KEEP(*(.con_initcall.init)) \
932 __con_initcall_end = .;
934 /* Alignment must be consistent with (kunit_suite *) in include/kunit/test.h */
935 #define KUNIT_TABLE() \
937 __kunit_suites_start = .; \
938 KEEP(*(.kunit_test_suites)) \
939 __kunit_suites_end = .;
941 #ifdef CONFIG_BLK_DEV_INITRD
942 #define INIT_RAM_FS \
944 __initramfs_start = .; \
945 KEEP(*(.init.ramfs)) \
947 KEEP(*(.init.ramfs.info))
953 * Memory encryption operates on a page basis. Since we need to clear
954 * the memory encryption mask for this section, it needs to be aligned
955 * on a page boundary and be a page-size multiple in length.
957 * Note: We use a separate section so that only this section gets
958 * decrypted to avoid exposing more than we wish.
960 #ifdef CONFIG_AMD_MEM_ENCRYPT
961 #define PERCPU_DECRYPTED_SECTION \
962 . = ALIGN(PAGE_SIZE); \
963 *(.data..decrypted) \
964 *(.data..percpu..decrypted) \
965 . = ALIGN(PAGE_SIZE);
967 #define PERCPU_DECRYPTED_SECTION
972 * Default discarded sections.
974 * Some archs want to discard exit text/data at runtime rather than
975 * link time due to cross-section references such as alt instructions,
976 * bug table, eh_frame, etc. DISCARDS must be the last of output
977 * section definitions so that such archs put those in earlier section
980 #ifdef RUNTIME_DISCARD_EXIT
981 #define EXIT_DISCARDS
983 #define EXIT_DISCARDS \
989 * Clang's -fprofile-arcs, -fsanitize=kernel-address, and
990 * -fsanitize=thread produce unwanted sections (.eh_frame
991 * and .init_array.*), but CONFIG_CONSTRUCTORS wants to
992 * keep any .init_array.* sections.
993 * https://bugs.llvm.org/show_bug.cgi?id=46478
995 #if defined(CONFIG_GCOV_KERNEL) || defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KCSAN) || \
996 defined(CONFIG_CFI_CLANG)
997 # ifdef CONFIG_CONSTRUCTORS
998 # define SANITIZER_DISCARDS \
1001 # define SANITIZER_DISCARDS \
1002 *(.init_array) *(.init_array.*) \
1006 # define SANITIZER_DISCARDS
1009 #define COMMON_DISCARDS \
1010 SANITIZER_DISCARDS \
1014 /* ld.bfd warns about .gnu.version* even when not emitted */ \
1025 * PERCPU_INPUT - the percpu input sections
1026 * @cacheline: cacheline size
1028 * The core percpu section names and core symbols which do not rely
1029 * directly upon load addresses.
1031 * @cacheline is used to align subsections to avoid false cacheline
1032 * sharing between subsections for different purposes.
1034 #define PERCPU_INPUT(cacheline) \
1035 __per_cpu_start = .; \
1036 *(.data..percpu..first) \
1037 . = ALIGN(PAGE_SIZE); \
1038 *(.data..percpu..page_aligned) \
1039 . = ALIGN(cacheline); \
1040 *(.data..percpu..read_mostly) \
1041 . = ALIGN(cacheline); \
1043 *(.data..percpu..shared_aligned) \
1044 PERCPU_DECRYPTED_SECTION \
1048 * PERCPU_VADDR - define output section for percpu area
1049 * @cacheline: cacheline size
1050 * @vaddr: explicit base address (optional)
1051 * @phdr: destination PHDR (optional)
1053 * Macro which expands to output section for percpu area.
1055 * @cacheline is used to align subsections to avoid false cacheline
1056 * sharing between subsections for different purposes.
1058 * If @vaddr is not blank, it specifies explicit base address and all
1059 * percpu symbols will be offset from the given address. If blank,
1060 * @vaddr always equals @laddr + LOAD_OFFSET.
1062 * @phdr defines the output PHDR to use if not blank. Be warned that
1063 * output PHDR is sticky. If @phdr is specified, the next output
1064 * section in the linker script will go there too. @phdr should have
1067 * Note that this macros defines __per_cpu_load as an absolute symbol.
1068 * If there is no need to put the percpu section at a predetermined
1069 * address, use PERCPU_SECTION.
1071 #define PERCPU_VADDR(cacheline, vaddr, phdr) \
1072 __per_cpu_load = .; \
1073 .data..percpu vaddr : AT(__per_cpu_load - LOAD_OFFSET) { \
1074 PERCPU_INPUT(cacheline) \
1076 . = __per_cpu_load + SIZEOF(.data..percpu);
1079 * PERCPU_SECTION - define output section for percpu area, simple version
1080 * @cacheline: cacheline size
1082 * Align to PAGE_SIZE and outputs output section for percpu area. This
1083 * macro doesn't manipulate @vaddr or @phdr and __per_cpu_load and
1084 * __per_cpu_start will be identical.
1086 * This macro is equivalent to ALIGN(PAGE_SIZE); PERCPU_VADDR(@cacheline,,)
1087 * except that __per_cpu_load is defined as a relative symbol against
1088 * .data..percpu which is required for relocatable x86_32 configuration.
1090 #define PERCPU_SECTION(cacheline) \
1091 . = ALIGN(PAGE_SIZE); \
1092 .data..percpu : AT(ADDR(.data..percpu) - LOAD_OFFSET) { \
1093 __per_cpu_load = .; \
1094 PERCPU_INPUT(cacheline) \
1099 * Definition of the high level *_SECTION macros
1100 * They will fit only a subset of the architectures
1106 * All sections are combined in a single .data section.
1107 * The sections following CONSTRUCTORS are arranged so their
1108 * typical alignment matches.
1109 * A cacheline is typical/always less than a PAGE_SIZE so
1110 * the sections that has this restriction (or similar)
1111 * is located before the ones requiring PAGE_SIZE alignment.
1112 * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which
1113 * matches the requirement of PAGE_ALIGNED_DATA.
1115 * use 0 as page_align if page_aligned data is not used */
1116 #define RW_DATA(cacheline, pagealigned, inittask) \
1117 . = ALIGN(PAGE_SIZE); \
1118 .data : AT(ADDR(.data) - LOAD_OFFSET) { \
1119 INIT_TASK_DATA(inittask) \
1121 PAGE_ALIGNED_DATA(pagealigned) \
1122 CACHELINE_ALIGNED_DATA(cacheline) \
1123 READ_MOSTLY_DATA(cacheline) \
1129 #define INIT_TEXT_SECTION(inittext_align) \
1130 . = ALIGN(inittext_align); \
1131 .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) { \
1137 #define INIT_DATA_SECTION(initsetup_align) \
1138 .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) { \
1140 INIT_SETUP(initsetup_align) \
1146 #define BSS_SECTION(sbss_align, bss_align, stop_align) \
1147 . = ALIGN(sbss_align); \
1151 . = ALIGN(stop_align); \