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 #define STRUCT_ALIGNMENT 32
120 #define STRUCT_ALIGN() . = ALIGN(STRUCT_ALIGNMENT)
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.
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 = .;
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)
141 #ifdef CONFIG_HOTPLUG_CPU
142 #define CPU_KEEP(sec) *(.cpu##sec)
143 #define CPU_DISCARD(sec)
145 #define CPU_KEEP(sec)
146 #define CPU_DISCARD(sec) *(.cpu##sec)
149 #if defined(CONFIG_MEMORY_HOTPLUG)
150 #define MEM_KEEP(sec) *(.mem##sec)
151 #define MEM_DISCARD(sec)
153 #define MEM_KEEP(sec)
154 #define MEM_DISCARD(sec) *(.mem##sec)
157 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
159 * The ftrace call sites are logged to a section whose name depends on the
160 * compiler option used. A given kernel image will only use one, AKA
161 * FTRACE_CALLSITE_SECTION. We capture all of them here to avoid header
162 * dependencies for FTRACE_CALLSITE_SECTION's definition.
164 * Need to also make ftrace_stub_graph point to ftrace_stub
165 * so that the same stub location may have different protocols
166 * and not mess up with C verifiers.
168 * ftrace_ops_list_func will be defined as arch_ftrace_ops_list_func
169 * as some archs will have a different prototype for that function
170 * but ftrace_ops_list_func() will have a single prototype.
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; \
178 ftrace_ops_list_func = arch_ftrace_ops_list_func;
180 # ifdef CONFIG_FUNCTION_TRACER
181 # define MCOUNT_REC() ftrace_stub_graph = ftrace_stub; \
182 ftrace_ops_list_func = arch_ftrace_ops_list_func;
184 # define MCOUNT_REC()
188 #ifdef CONFIG_TRACE_BRANCH_PROFILING
189 #define LIKELY_PROFILE() __start_annotated_branch_profile = .; \
190 KEEP(*(_ftrace_annotated_branch)) \
191 __stop_annotated_branch_profile = .;
193 #define LIKELY_PROFILE()
196 #ifdef CONFIG_PROFILE_ALL_BRANCHES
197 #define BRANCH_PROFILE() __start_branch_profile = .; \
198 KEEP(*(_ftrace_branch)) \
199 __stop_branch_profile = .;
201 #define BRANCH_PROFILE()
204 #ifdef CONFIG_KPROBES
205 #define KPROBE_BLACKLIST() . = ALIGN(8); \
206 __start_kprobe_blacklist = .; \
207 KEEP(*(_kprobe_blacklist)) \
208 __stop_kprobe_blacklist = .;
210 #define KPROBE_BLACKLIST()
213 #ifdef CONFIG_FUNCTION_ERROR_INJECTION
214 #define ERROR_INJECT_WHITELIST() STRUCT_ALIGN(); \
215 __start_error_injection_whitelist = .; \
216 KEEP(*(_error_injection_whitelist)) \
217 __stop_error_injection_whitelist = .;
219 #define ERROR_INJECT_WHITELIST()
222 #ifdef CONFIG_EVENT_TRACING
223 #define FTRACE_EVENTS() . = ALIGN(8); \
224 __start_ftrace_events = .; \
225 KEEP(*(_ftrace_events)) \
226 __stop_ftrace_events = .; \
227 __start_ftrace_eval_maps = .; \
228 KEEP(*(_ftrace_eval_map)) \
229 __stop_ftrace_eval_maps = .;
231 #define FTRACE_EVENTS()
234 #ifdef CONFIG_TRACING
235 #define TRACE_PRINTKS() __start___trace_bprintk_fmt = .; \
236 KEEP(*(__trace_printk_fmt)) /* Trace_printk fmt' pointer */ \
237 __stop___trace_bprintk_fmt = .;
238 #define TRACEPOINT_STR() __start___tracepoint_str = .; \
239 KEEP(*(__tracepoint_str)) /* Trace_printk fmt' pointer */ \
240 __stop___tracepoint_str = .;
242 #define TRACE_PRINTKS()
243 #define TRACEPOINT_STR()
246 #ifdef CONFIG_FTRACE_SYSCALLS
247 #define TRACE_SYSCALLS() . = ALIGN(8); \
248 __start_syscalls_metadata = .; \
249 KEEP(*(__syscalls_metadata)) \
250 __stop_syscalls_metadata = .;
252 #define TRACE_SYSCALLS()
255 #ifdef CONFIG_BPF_EVENTS
256 #define BPF_RAW_TP() STRUCT_ALIGN(); \
257 __start__bpf_raw_tp = .; \
258 KEEP(*(__bpf_raw_tp_map)) \
259 __stop__bpf_raw_tp = .;
264 #ifdef CONFIG_SERIAL_EARLYCON
265 #define EARLYCON_TABLE() . = ALIGN(8); \
266 __earlycon_table = .; \
267 KEEP(*(__earlycon_table)) \
268 __earlycon_table_end = .;
270 #define EARLYCON_TABLE()
273 #ifdef CONFIG_SECURITY
274 #define LSM_TABLE() . = ALIGN(8); \
275 __start_lsm_info = .; \
276 KEEP(*(.lsm_info.init)) \
278 #define EARLY_LSM_TABLE() . = ALIGN(8); \
279 __start_early_lsm_info = .; \
280 KEEP(*(.early_lsm_info.init)) \
281 __end_early_lsm_info = .;
284 #define EARLY_LSM_TABLE()
287 #define ___OF_TABLE(cfg, name) _OF_TABLE_##cfg(name)
288 #define __OF_TABLE(cfg, name) ___OF_TABLE(cfg, name)
289 #define OF_TABLE(cfg, name) __OF_TABLE(IS_ENABLED(cfg), name)
290 #define _OF_TABLE_0(name)
291 #define _OF_TABLE_1(name) \
293 __##name##_of_table = .; \
294 KEEP(*(__##name##_of_table)) \
295 KEEP(*(__##name##_of_table_end))
297 #define TIMER_OF_TABLES() OF_TABLE(CONFIG_TIMER_OF, timer)
298 #define IRQCHIP_OF_MATCH_TABLE() OF_TABLE(CONFIG_IRQCHIP, irqchip)
299 #define CLK_OF_TABLES() OF_TABLE(CONFIG_COMMON_CLK, clk)
300 #define RESERVEDMEM_OF_TABLES() OF_TABLE(CONFIG_OF_RESERVED_MEM, reservedmem)
301 #define CPU_METHOD_OF_TABLES() OF_TABLE(CONFIG_SMP, cpu_method)
302 #define CPUIDLE_METHOD_OF_TABLES() OF_TABLE(CONFIG_CPU_IDLE, cpuidle_method)
305 #define ACPI_PROBE_TABLE(name) \
307 __##name##_acpi_probe_table = .; \
308 KEEP(*(__##name##_acpi_probe_table)) \
309 __##name##_acpi_probe_table_end = .;
311 #define ACPI_PROBE_TABLE(name)
314 #ifdef CONFIG_THERMAL
315 #define THERMAL_TABLE(name) \
317 __##name##_thermal_table = .; \
318 KEEP(*(__##name##_thermal_table)) \
319 __##name##_thermal_table_end = .;
321 #define THERMAL_TABLE(name)
324 #define KERNEL_DTB() \
327 KEEP(*(.dtb.init.rodata)) \
336 *(.data..decrypted) \
338 *(.data..shared_aligned) /* percpu related */ \
339 MEM_KEEP(init.data*) \
340 MEM_KEEP(exit.data*) \
347 /* implement dynamic printk debug */ \
349 __start___dyndbg = .; \
351 __stop___dyndbg = .; \
359 * Data section helpers
361 #define NOSAVE_DATA \
362 . = ALIGN(PAGE_SIZE); \
363 __nosave_begin = .; \
365 . = ALIGN(PAGE_SIZE); \
368 #define PAGE_ALIGNED_DATA(page_align) \
369 . = ALIGN(page_align); \
370 *(.data..page_aligned) \
371 . = ALIGN(page_align);
373 #define READ_MOSTLY_DATA(align) \
375 *(.data..read_mostly) \
378 #define CACHELINE_ALIGNED_DATA(align) \
380 *(.data..cacheline_aligned)
382 #define INIT_TASK_DATA(align) \
384 __start_init_task = .; \
385 init_thread_union = .; \
387 KEEP(*(.data..init_task)) \
388 KEEP(*(.data..init_thread_info)) \
389 . = __start_init_task + THREAD_SIZE; \
392 #define JUMP_TABLE_DATA \
394 __start___jump_table = .; \
395 KEEP(*(__jump_table)) \
396 __stop___jump_table = .;
398 #ifdef CONFIG_HAVE_STATIC_CALL_INLINE
399 #define STATIC_CALL_DATA \
401 __start_static_call_sites = .; \
402 KEEP(*(.static_call_sites)) \
403 __stop_static_call_sites = .; \
404 __start_static_call_tramp_key = .; \
405 KEEP(*(.static_call_tramp_key)) \
406 __stop_static_call_tramp_key = .;
408 #define STATIC_CALL_DATA
412 * Allow architectures to handle ro_after_init data on their
413 * own by defining an empty RO_AFTER_INIT_DATA.
415 #ifndef RO_AFTER_INIT_DATA
416 #define RO_AFTER_INIT_DATA \
418 __start_ro_after_init = .; \
419 *(.data..ro_after_init) \
422 __end_ro_after_init = .;
428 #define RO_DATA(align) \
429 . = ALIGN((align)); \
430 .rodata : AT(ADDR(.rodata) - LOAD_OFFSET) { \
431 __start_rodata = .; \
432 *(.rodata) *(.rodata.*) \
434 RO_AFTER_INIT_DATA /* Read only after init */ \
436 __start___tracepoints_ptrs = .; \
437 KEEP(*(__tracepoints_ptrs)) /* Tracepoints: pointer array */ \
438 __stop___tracepoints_ptrs = .; \
439 *(__tracepoints_strings)/* Tracepoints: strings */ \
442 .rodata1 : AT(ADDR(.rodata1) - LOAD_OFFSET) { \
447 .pci_fixup : AT(ADDR(.pci_fixup) - LOAD_OFFSET) { \
448 __start_pci_fixups_early = .; \
449 KEEP(*(.pci_fixup_early)) \
450 __end_pci_fixups_early = .; \
451 __start_pci_fixups_header = .; \
452 KEEP(*(.pci_fixup_header)) \
453 __end_pci_fixups_header = .; \
454 __start_pci_fixups_final = .; \
455 KEEP(*(.pci_fixup_final)) \
456 __end_pci_fixups_final = .; \
457 __start_pci_fixups_enable = .; \
458 KEEP(*(.pci_fixup_enable)) \
459 __end_pci_fixups_enable = .; \
460 __start_pci_fixups_resume = .; \
461 KEEP(*(.pci_fixup_resume)) \
462 __end_pci_fixups_resume = .; \
463 __start_pci_fixups_resume_early = .; \
464 KEEP(*(.pci_fixup_resume_early)) \
465 __end_pci_fixups_resume_early = .; \
466 __start_pci_fixups_suspend = .; \
467 KEEP(*(.pci_fixup_suspend)) \
468 __end_pci_fixups_suspend = .; \
469 __start_pci_fixups_suspend_late = .; \
470 KEEP(*(.pci_fixup_suspend_late)) \
471 __end_pci_fixups_suspend_late = .; \
474 FW_LOADER_BUILT_IN_DATA \
479 /* Kernel symbol table: Normal symbols */ \
480 __ksymtab : AT(ADDR(__ksymtab) - LOAD_OFFSET) { \
481 __start___ksymtab = .; \
482 KEEP(*(SORT(___ksymtab+*))) \
483 __stop___ksymtab = .; \
486 /* Kernel symbol table: GPL-only symbols */ \
487 __ksymtab_gpl : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) { \
488 __start___ksymtab_gpl = .; \
489 KEEP(*(SORT(___ksymtab_gpl+*))) \
490 __stop___ksymtab_gpl = .; \
493 /* Kernel symbol table: Normal symbols */ \
494 __kcrctab : AT(ADDR(__kcrctab) - LOAD_OFFSET) { \
495 __start___kcrctab = .; \
496 KEEP(*(SORT(___kcrctab+*))) \
497 __stop___kcrctab = .; \
500 /* Kernel symbol table: GPL-only symbols */ \
501 __kcrctab_gpl : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) { \
502 __start___kcrctab_gpl = .; \
503 KEEP(*(SORT(___kcrctab_gpl+*))) \
504 __stop___kcrctab_gpl = .; \
507 /* Kernel symbol table: strings */ \
508 __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \
509 *(__ksymtab_strings) \
512 /* __*init sections */ \
513 __init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) { \
515 MEM_KEEP(init.rodata) \
516 MEM_KEEP(exit.rodata) \
519 /* Built-in module parameters. */ \
520 __param : AT(ADDR(__param) - LOAD_OFFSET) { \
521 __start___param = .; \
523 __stop___param = .; \
526 /* Built-in module versions. */ \
527 __modver : AT(ADDR(__modver) - LOAD_OFFSET) { \
528 __start___modver = .; \
530 __stop___modver = .; \
537 . = ALIGN((align)); \
542 * .text..L.cfi.jumptable.* contain Control-Flow Integrity (CFI)
543 * jump table entries.
545 #ifdef CONFIG_CFI_CLANG
546 #define TEXT_CFI_JT \
548 __cfi_jt_start = .; \
549 *(.text..L.cfi.jumptable .text..L.cfi.jumptable.*) \
556 * Non-instrumentable text section
558 #define NOINSTR_TEXT \
560 __noinstr_text_start = .; \
562 __noinstr_text_end = .;
565 * .text section. Map to function alignment to avoid address changes
566 * during second ld run in second ld pass when generating System.map
568 * TEXT_MAIN here will match .text.fixup and .text.unlikely if dead
569 * code elimination is enabled, so these sections should be converted
574 *(.text.hot .text.hot.*) \
575 *(TEXT_MAIN .text.fixup) \
576 *(.text.unlikely .text.unlikely.*) \
577 *(.text.unknown .text.unknown.*) \
581 *(.text.asan.* .text.tsan.*) \
583 MEM_KEEP(init.text*) \
584 MEM_KEEP(exit.text*) \
587 /* sched.text is aling to function alignment to secure we have same
588 * address even at second ld pass when generating System.map */
591 __sched_text_start = .; \
593 __sched_text_end = .;
595 /* spinlock.text is aling to function alignment to secure we have same
596 * address even at second ld pass when generating System.map */
599 __lock_text_start = .; \
603 #define CPUIDLE_TEXT \
605 __cpuidle_text_start = .; \
607 __cpuidle_text_end = .;
609 #define KPROBES_TEXT \
611 __kprobes_text_start = .; \
613 __kprobes_text_end = .;
617 __entry_text_start = .; \
619 __entry_text_end = .;
621 #define IRQENTRY_TEXT \
623 __irqentry_text_start = .; \
625 __irqentry_text_end = .;
627 #define SOFTIRQENTRY_TEXT \
629 __softirqentry_text_start = .; \
630 *(.softirqentry.text) \
631 __softirqentry_text_end = .;
633 #define STATIC_CALL_TEXT \
635 __static_call_text_start = .; \
636 *(.static_call.text) \
637 __static_call_text_end = .;
639 /* Section used for early init (in .S files) */
640 #define HEAD_TEXT KEEP(*(.head.text))
642 #define HEAD_TEXT_SECTION \
643 .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) { \
650 #define EXCEPTION_TABLE(align) \
652 __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) { \
653 __start___ex_table = .; \
654 KEEP(*(__ex_table)) \
655 __stop___ex_table = .; \
661 #ifdef CONFIG_DEBUG_INFO_BTF
663 .BTF : AT(ADDR(.BTF) - LOAD_OFFSET) { \
669 .BTF_ids : AT(ADDR(.BTF_ids) - LOAD_OFFSET) { \
679 #define INIT_TASK_DATA_SECTION(align) \
681 .data..init_task : AT(ADDR(.data..init_task) - LOAD_OFFSET) { \
682 INIT_TASK_DATA(align) \
685 #ifdef CONFIG_CONSTRUCTORS
686 #define KERNEL_CTORS() . = ALIGN(8); \
688 KEEP(*(SORT(.ctors.*))) \
690 KEEP(*(SORT(.init_array.*))) \
691 KEEP(*(.init_array)) \
694 #define KERNEL_CTORS()
697 /* init and exit section handling */
699 KEEP(*(SORT(___kentry+*))) \
700 *(.init.data init.data.*) \
701 MEM_DISCARD(init.data*) \
704 *(.init.rodata .init.rodata.*) \
708 ERROR_INJECT_WHITELIST() \
709 MEM_DISCARD(init.rodata) \
711 RESERVEDMEM_OF_TABLES() \
713 CPU_METHOD_OF_TABLES() \
714 CPUIDLE_METHOD_OF_TABLES() \
716 IRQCHIP_OF_MATCH_TABLE() \
717 ACPI_PROBE_TABLE(irqchip) \
718 ACPI_PROBE_TABLE(timer) \
719 THERMAL_TABLE(governor) \
726 *(.init.text .init.text.*) \
728 MEM_DISCARD(init.text*)
731 *(.exit.data .exit.data.*) \
732 *(.fini_array .fini_array.*) \
734 MEM_DISCARD(exit.data*) \
735 MEM_DISCARD(exit.rodata*)
740 MEM_DISCARD(exit.text)
746 * bss (Block Started by Symbol) - uninitialized data
747 * zeroed during startup
749 #define SBSS(sbss_align) \
750 . = ALIGN(sbss_align); \
751 .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) { \
758 * Allow archectures to redefine BSS_FIRST_SECTIONS to add extra
759 * sections to the front of bss.
761 #ifndef BSS_FIRST_SECTIONS
762 #define BSS_FIRST_SECTIONS
765 #define BSS(bss_align) \
766 . = ALIGN(bss_align); \
767 .bss : AT(ADDR(.bss) - LOAD_OFFSET) { \
769 . = ALIGN(PAGE_SIZE); \
770 *(.bss..page_aligned) \
771 . = ALIGN(PAGE_SIZE); \
778 * DWARF debug sections.
779 * Symbols in the DWARF debugging sections are relative to
780 * the beginning of the section so we begin them at 0.
782 #define DWARF_DEBUG \
784 .debug 0 : { *(.debug) } \
785 .line 0 : { *(.line) } \
786 /* GNU DWARF 1 extensions */ \
787 .debug_srcinfo 0 : { *(.debug_srcinfo) } \
788 .debug_sfnames 0 : { *(.debug_sfnames) } \
789 /* DWARF 1.1 and DWARF 2 */ \
790 .debug_aranges 0 : { *(.debug_aranges) } \
791 .debug_pubnames 0 : { *(.debug_pubnames) } \
793 .debug_info 0 : { *(.debug_info \
794 .gnu.linkonce.wi.*) } \
795 .debug_abbrev 0 : { *(.debug_abbrev) } \
796 .debug_line 0 : { *(.debug_line) } \
797 .debug_frame 0 : { *(.debug_frame) } \
798 .debug_str 0 : { *(.debug_str) } \
799 .debug_loc 0 : { *(.debug_loc) } \
800 .debug_macinfo 0 : { *(.debug_macinfo) } \
801 .debug_pubtypes 0 : { *(.debug_pubtypes) } \
803 .debug_ranges 0 : { *(.debug_ranges) } \
804 /* SGI/MIPS DWARF 2 extensions */ \
805 .debug_weaknames 0 : { *(.debug_weaknames) } \
806 .debug_funcnames 0 : { *(.debug_funcnames) } \
807 .debug_typenames 0 : { *(.debug_typenames) } \
808 .debug_varnames 0 : { *(.debug_varnames) } \
809 /* GNU DWARF 2 extensions */ \
810 .debug_gnu_pubnames 0 : { *(.debug_gnu_pubnames) } \
811 .debug_gnu_pubtypes 0 : { *(.debug_gnu_pubtypes) } \
813 .debug_types 0 : { *(.debug_types) } \
815 .debug_addr 0 : { *(.debug_addr) } \
816 .debug_line_str 0 : { *(.debug_line_str) } \
817 .debug_loclists 0 : { *(.debug_loclists) } \
818 .debug_macro 0 : { *(.debug_macro) } \
819 .debug_names 0 : { *(.debug_names) } \
820 .debug_rnglists 0 : { *(.debug_rnglists) } \
821 .debug_str_offsets 0 : { *(.debug_str_offsets) }
823 /* Stabs debugging sections. */
824 #define STABS_DEBUG \
825 .stab 0 : { *(.stab) } \
826 .stabstr 0 : { *(.stabstr) } \
827 .stab.excl 0 : { *(.stab.excl) } \
828 .stab.exclstr 0 : { *(.stab.exclstr) } \
829 .stab.index 0 : { *(.stab.index) } \
830 .stab.indexstr 0 : { *(.stab.indexstr) }
832 /* Required sections not related to debugging. */
833 #define ELF_DETAILS \
834 .comment 0 : { *(.comment) } \
835 .symtab 0 : { *(.symtab) } \
836 .strtab 0 : { *(.strtab) } \
837 .shstrtab 0 : { *(.shstrtab) }
839 #ifdef CONFIG_GENERIC_BUG
842 __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) { \
843 __start___bug_table = .; \
844 KEEP(*(__bug_table)) \
845 __stop___bug_table = .; \
851 #ifdef CONFIG_UNWINDER_ORC
852 #define ORC_UNWIND_TABLE \
854 .orc_unwind_ip : AT(ADDR(.orc_unwind_ip) - LOAD_OFFSET) { \
855 __start_orc_unwind_ip = .; \
856 KEEP(*(.orc_unwind_ip)) \
857 __stop_orc_unwind_ip = .; \
860 .orc_unwind : AT(ADDR(.orc_unwind) - LOAD_OFFSET) { \
861 __start_orc_unwind = .; \
862 KEEP(*(.orc_unwind)) \
863 __stop_orc_unwind = .; \
865 text_size = _etext - _stext; \
867 .orc_lookup : AT(ADDR(.orc_lookup) - LOAD_OFFSET) { \
869 . += (((text_size + LOOKUP_BLOCK_SIZE - 1) / \
870 LOOKUP_BLOCK_SIZE) + 1) * 4; \
871 orc_lookup_end = .; \
874 #define ORC_UNWIND_TABLE
877 /* Built-in firmware blobs */
878 #ifdef CONFIG_FW_LOADER
879 #define FW_LOADER_BUILT_IN_DATA \
880 .builtin_fw : AT(ADDR(.builtin_fw) - LOAD_OFFSET) ALIGN(8) { \
881 __start_builtin_fw = .; \
882 KEEP(*(.builtin_fw)) \
883 __end_builtin_fw = .; \
886 #define FW_LOADER_BUILT_IN_DATA
889 #ifdef CONFIG_PM_TRACE
892 .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) { \
893 __tracedata_start = .; \
894 KEEP(*(.tracedata)) \
895 __tracedata_end = .; \
901 #ifdef CONFIG_PRINTK_INDEX
902 #define PRINTK_INDEX \
903 .printk_index : AT(ADDR(.printk_index) - LOAD_OFFSET) { \
904 __start_printk_index = .; \
906 __stop_printk_index = .; \
913 .notes : AT(ADDR(.notes) - LOAD_OFFSET) { \
918 NOTES_HEADERS_RESTORE
920 #define INIT_SETUP(initsetup_align) \
921 . = ALIGN(initsetup_align); \
923 KEEP(*(.init.setup)) \
926 #define INIT_CALLS_LEVEL(level) \
927 __initcall##level##_start = .; \
928 KEEP(*(.initcall##level##.init)) \
929 KEEP(*(.initcall##level##s.init)) \
932 __initcall_start = .; \
933 KEEP(*(.initcallearly.init)) \
934 INIT_CALLS_LEVEL(0) \
935 INIT_CALLS_LEVEL(1) \
936 INIT_CALLS_LEVEL(2) \
937 INIT_CALLS_LEVEL(3) \
938 INIT_CALLS_LEVEL(4) \
939 INIT_CALLS_LEVEL(5) \
940 INIT_CALLS_LEVEL(rootfs) \
941 INIT_CALLS_LEVEL(6) \
942 INIT_CALLS_LEVEL(7) \
945 #define CON_INITCALL \
946 __con_initcall_start = .; \
947 KEEP(*(.con_initcall.init)) \
948 __con_initcall_end = .;
950 /* Alignment must be consistent with (kunit_suite *) in include/kunit/test.h */
951 #define KUNIT_TABLE() \
953 __kunit_suites_start = .; \
954 KEEP(*(.kunit_test_suites)) \
955 __kunit_suites_end = .;
957 #ifdef CONFIG_BLK_DEV_INITRD
958 #define INIT_RAM_FS \
960 __initramfs_start = .; \
961 KEEP(*(.init.ramfs)) \
963 KEEP(*(.init.ramfs.info))
969 * Memory encryption operates on a page basis. Since we need to clear
970 * the memory encryption mask for this section, it needs to be aligned
971 * on a page boundary and be a page-size multiple in length.
973 * Note: We use a separate section so that only this section gets
974 * decrypted to avoid exposing more than we wish.
976 #ifdef CONFIG_AMD_MEM_ENCRYPT
977 #define PERCPU_DECRYPTED_SECTION \
978 . = ALIGN(PAGE_SIZE); \
979 *(.data..percpu..decrypted) \
980 . = ALIGN(PAGE_SIZE);
982 #define PERCPU_DECRYPTED_SECTION
987 * Default discarded sections.
989 * Some archs want to discard exit text/data at runtime rather than
990 * link time due to cross-section references such as alt instructions,
991 * bug table, eh_frame, etc. DISCARDS must be the last of output
992 * section definitions so that such archs put those in earlier section
995 #ifdef RUNTIME_DISCARD_EXIT
996 #define EXIT_DISCARDS
998 #define EXIT_DISCARDS \
1004 * Clang's -fprofile-arcs, -fsanitize=kernel-address, and
1005 * -fsanitize=thread produce unwanted sections (.eh_frame
1006 * and .init_array.*), but CONFIG_CONSTRUCTORS wants to
1007 * keep any .init_array.* sections.
1008 * https://bugs.llvm.org/show_bug.cgi?id=46478
1010 #if defined(CONFIG_GCOV_KERNEL) || defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KCSAN) || \
1011 defined(CONFIG_CFI_CLANG)
1012 # ifdef CONFIG_CONSTRUCTORS
1013 # define SANITIZER_DISCARDS \
1016 # define SANITIZER_DISCARDS \
1017 *(.init_array) *(.init_array.*) \
1021 # define SANITIZER_DISCARDS
1024 #define COMMON_DISCARDS \
1025 SANITIZER_DISCARDS \
1029 /* ld.bfd warns about .gnu.version* even when not emitted */ \
1040 * PERCPU_INPUT - the percpu input sections
1041 * @cacheline: cacheline size
1043 * The core percpu section names and core symbols which do not rely
1044 * directly upon load addresses.
1046 * @cacheline is used to align subsections to avoid false cacheline
1047 * sharing between subsections for different purposes.
1049 #define PERCPU_INPUT(cacheline) \
1050 __per_cpu_start = .; \
1051 *(.data..percpu..first) \
1052 . = ALIGN(PAGE_SIZE); \
1053 *(.data..percpu..page_aligned) \
1054 . = ALIGN(cacheline); \
1055 *(.data..percpu..read_mostly) \
1056 . = ALIGN(cacheline); \
1058 *(.data..percpu..shared_aligned) \
1059 PERCPU_DECRYPTED_SECTION \
1063 * PERCPU_VADDR - define output section for percpu area
1064 * @cacheline: cacheline size
1065 * @vaddr: explicit base address (optional)
1066 * @phdr: destination PHDR (optional)
1068 * Macro which expands to output section for percpu area.
1070 * @cacheline is used to align subsections to avoid false cacheline
1071 * sharing between subsections for different purposes.
1073 * If @vaddr is not blank, it specifies explicit base address and all
1074 * percpu symbols will be offset from the given address. If blank,
1075 * @vaddr always equals @laddr + LOAD_OFFSET.
1077 * @phdr defines the output PHDR to use if not blank. Be warned that
1078 * output PHDR is sticky. If @phdr is specified, the next output
1079 * section in the linker script will go there too. @phdr should have
1082 * Note that this macros defines __per_cpu_load as an absolute symbol.
1083 * If there is no need to put the percpu section at a predetermined
1084 * address, use PERCPU_SECTION.
1086 #define PERCPU_VADDR(cacheline, vaddr, phdr) \
1087 __per_cpu_load = .; \
1088 .data..percpu vaddr : AT(__per_cpu_load - LOAD_OFFSET) { \
1089 PERCPU_INPUT(cacheline) \
1091 . = __per_cpu_load + SIZEOF(.data..percpu);
1094 * PERCPU_SECTION - define output section for percpu area, simple version
1095 * @cacheline: cacheline size
1097 * Align to PAGE_SIZE and outputs output section for percpu area. This
1098 * macro doesn't manipulate @vaddr or @phdr and __per_cpu_load and
1099 * __per_cpu_start will be identical.
1101 * This macro is equivalent to ALIGN(PAGE_SIZE); PERCPU_VADDR(@cacheline,,)
1102 * except that __per_cpu_load is defined as a relative symbol against
1103 * .data..percpu which is required for relocatable x86_32 configuration.
1105 #define PERCPU_SECTION(cacheline) \
1106 . = ALIGN(PAGE_SIZE); \
1107 .data..percpu : AT(ADDR(.data..percpu) - LOAD_OFFSET) { \
1108 __per_cpu_load = .; \
1109 PERCPU_INPUT(cacheline) \
1114 * Definition of the high level *_SECTION macros
1115 * They will fit only a subset of the architectures
1121 * All sections are combined in a single .data section.
1122 * The sections following CONSTRUCTORS are arranged so their
1123 * typical alignment matches.
1124 * A cacheline is typical/always less than a PAGE_SIZE so
1125 * the sections that has this restriction (or similar)
1126 * is located before the ones requiring PAGE_SIZE alignment.
1127 * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which
1128 * matches the requirement of PAGE_ALIGNED_DATA.
1130 * use 0 as page_align if page_aligned data is not used */
1131 #define RW_DATA(cacheline, pagealigned, inittask) \
1132 . = ALIGN(PAGE_SIZE); \
1133 .data : AT(ADDR(.data) - LOAD_OFFSET) { \
1134 INIT_TASK_DATA(inittask) \
1136 PAGE_ALIGNED_DATA(pagealigned) \
1137 CACHELINE_ALIGNED_DATA(cacheline) \
1138 READ_MOSTLY_DATA(cacheline) \
1144 #define INIT_TEXT_SECTION(inittext_align) \
1145 . = ALIGN(inittext_align); \
1146 .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) { \
1152 #define INIT_DATA_SECTION(initsetup_align) \
1153 .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) { \
1155 INIT_SETUP(initsetup_align) \
1161 #define BSS_SECTION(sbss_align, bss_align, stop_align) \
1162 . = ALIGN(sbss_align); \
1166 . = ALIGN(stop_align); \