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 . function alignment. */
85 #define ALIGN_FUNCTION() . = ALIGN(CONFIG_FUNCTION_ALIGNMENT)
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 #ifndef CONFIG_HAVE_DYNAMIC_FTRACE_NO_PATCHABLE
158 #define KEEP_PATCHABLE KEEP(*(__patchable_function_entries))
159 #define PATCHABLE_DISCARDS
161 #define KEEP_PATCHABLE
162 #define PATCHABLE_DISCARDS *(__patchable_function_entries)
165 #ifndef CONFIG_ARCH_SUPPORTS_CFI_CLANG
167 * Simply points to ftrace_stub, but with the proper protocol.
168 * Defined by the linker script in linux/vmlinux.lds.h
170 #define FTRACE_STUB_HACK ftrace_stub_graph = ftrace_stub;
172 #define FTRACE_STUB_HACK
175 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
177 * The ftrace call sites are logged to a section whose name depends on the
178 * compiler option used. A given kernel image will only use one, AKA
179 * FTRACE_CALLSITE_SECTION. We capture all of them here to avoid header
180 * dependencies for FTRACE_CALLSITE_SECTION's definition.
182 * ftrace_ops_list_func will be defined as arch_ftrace_ops_list_func
183 * as some archs will have a different prototype for that function
184 * but ftrace_ops_list_func() will have a single prototype.
186 #define MCOUNT_REC() . = ALIGN(8); \
187 __start_mcount_loc = .; \
188 KEEP(*(__mcount_loc)) \
190 __stop_mcount_loc = .; \
192 ftrace_ops_list_func = arch_ftrace_ops_list_func;
194 # ifdef CONFIG_FUNCTION_TRACER
195 # define MCOUNT_REC() FTRACE_STUB_HACK \
196 ftrace_ops_list_func = arch_ftrace_ops_list_func;
198 # define MCOUNT_REC()
202 #define BOUNDED_SECTION_PRE_LABEL(_sec_, _label_, _BEGIN_, _END_) \
203 _BEGIN_##_label_ = .; \
207 #define BOUNDED_SECTION_POST_LABEL(_sec_, _label_, _BEGIN_, _END_) \
208 _label_##_BEGIN_ = .; \
212 #define BOUNDED_SECTION_BY(_sec_, _label_) \
213 BOUNDED_SECTION_PRE_LABEL(_sec_, _label_, __start, __stop)
215 #define BOUNDED_SECTION(_sec) BOUNDED_SECTION_BY(_sec, _sec)
217 #define HEADERED_SECTION_PRE_LABEL(_sec_, _label_, _BEGIN_, _END_, _HDR_) \
218 _HDR_##_label_ = .; \
219 KEEP(*(.gnu.linkonce.##_sec_)) \
220 BOUNDED_SECTION_PRE_LABEL(_sec_, _label_, _BEGIN_, _END_)
222 #define HEADERED_SECTION_POST_LABEL(_sec_, _label_, _BEGIN_, _END_, _HDR_) \
223 _label_##_HDR_ = .; \
224 KEEP(*(.gnu.linkonce.##_sec_)) \
225 BOUNDED_SECTION_POST_LABEL(_sec_, _label_, _BEGIN_, _END_)
227 #define HEADERED_SECTION_BY(_sec_, _label_) \
228 HEADERED_SECTION_PRE_LABEL(_sec_, _label_, __start, __stop)
230 #define HEADERED_SECTION(_sec) HEADERED_SECTION_BY(_sec, _sec)
232 #ifdef CONFIG_TRACE_BRANCH_PROFILING
233 #define LIKELY_PROFILE() \
234 BOUNDED_SECTION_BY(_ftrace_annotated_branch, _annotated_branch_profile)
236 #define LIKELY_PROFILE()
239 #ifdef CONFIG_PROFILE_ALL_BRANCHES
240 #define BRANCH_PROFILE() \
241 BOUNDED_SECTION_BY(_ftrace_branch, _branch_profile)
243 #define BRANCH_PROFILE()
246 #ifdef CONFIG_KPROBES
247 #define KPROBE_BLACKLIST() \
249 BOUNDED_SECTION(_kprobe_blacklist)
251 #define KPROBE_BLACKLIST()
254 #ifdef CONFIG_FUNCTION_ERROR_INJECTION
255 #define ERROR_INJECT_WHITELIST() \
257 BOUNDED_SECTION(_error_injection_whitelist)
259 #define ERROR_INJECT_WHITELIST()
262 #ifdef CONFIG_EVENT_TRACING
263 #define FTRACE_EVENTS() \
265 BOUNDED_SECTION(_ftrace_events) \
266 BOUNDED_SECTION_BY(_ftrace_eval_map, _ftrace_eval_maps)
268 #define FTRACE_EVENTS()
271 #ifdef CONFIG_TRACING
272 #define TRACE_PRINTKS() BOUNDED_SECTION_BY(__trace_printk_fmt, ___trace_bprintk_fmt)
273 #define TRACEPOINT_STR() BOUNDED_SECTION_BY(__tracepoint_str, ___tracepoint_str)
275 #define TRACE_PRINTKS()
276 #define TRACEPOINT_STR()
279 #ifdef CONFIG_FTRACE_SYSCALLS
280 #define TRACE_SYSCALLS() \
282 BOUNDED_SECTION_BY(__syscalls_metadata, _syscalls_metadata)
284 #define TRACE_SYSCALLS()
287 #ifdef CONFIG_BPF_EVENTS
288 #define BPF_RAW_TP() STRUCT_ALIGN(); \
289 BOUNDED_SECTION_BY(__bpf_raw_tp_map, __bpf_raw_tp)
294 #ifdef CONFIG_SERIAL_EARLYCON
295 #define EARLYCON_TABLE() \
297 BOUNDED_SECTION_POST_LABEL(__earlycon_table, __earlycon_table, , _end)
299 #define EARLYCON_TABLE()
302 #ifdef CONFIG_SECURITY
303 #define LSM_TABLE() \
305 BOUNDED_SECTION_PRE_LABEL(.lsm_info.init, _lsm_info, __start, __end)
307 #define EARLY_LSM_TABLE() \
309 BOUNDED_SECTION_PRE_LABEL(.early_lsm_info.init, _early_lsm_info, __start, __end)
312 #define EARLY_LSM_TABLE()
315 #define ___OF_TABLE(cfg, name) _OF_TABLE_##cfg(name)
316 #define __OF_TABLE(cfg, name) ___OF_TABLE(cfg, name)
317 #define OF_TABLE(cfg, name) __OF_TABLE(IS_ENABLED(cfg), name)
318 #define _OF_TABLE_0(name)
319 #define _OF_TABLE_1(name) \
321 __##name##_of_table = .; \
322 KEEP(*(__##name##_of_table)) \
323 KEEP(*(__##name##_of_table_end))
325 #define TIMER_OF_TABLES() OF_TABLE(CONFIG_TIMER_OF, timer)
326 #define IRQCHIP_OF_MATCH_TABLE() OF_TABLE(CONFIG_IRQCHIP, irqchip)
327 #define CLK_OF_TABLES() OF_TABLE(CONFIG_COMMON_CLK, clk)
328 #define RESERVEDMEM_OF_TABLES() OF_TABLE(CONFIG_OF_RESERVED_MEM, reservedmem)
329 #define CPU_METHOD_OF_TABLES() OF_TABLE(CONFIG_SMP, cpu_method)
330 #define CPUIDLE_METHOD_OF_TABLES() OF_TABLE(CONFIG_CPU_IDLE, cpuidle_method)
333 #define ACPI_PROBE_TABLE(name) \
335 BOUNDED_SECTION_POST_LABEL(__##name##_acpi_probe_table, \
336 __##name##_acpi_probe_table,, _end)
338 #define ACPI_PROBE_TABLE(name)
341 #ifdef CONFIG_THERMAL
342 #define THERMAL_TABLE(name) \
344 BOUNDED_SECTION_POST_LABEL(__##name##_thermal_table, \
345 __##name##_thermal_table,, _end)
347 #define THERMAL_TABLE(name)
350 #define KERNEL_DTB() \
353 KEEP(*(.dtb.init.rodata)) \
362 *(.data..decrypted) \
364 *(.data..shared_aligned) /* percpu related */ \
365 MEM_KEEP(init.data*) \
366 MEM_KEEP(exit.data*) \
373 /* implement dynamic printk debug */ \
375 BOUNDED_SECTION_BY(__dyndbg_classes, ___dyndbg_classes) \
376 BOUNDED_SECTION_BY(__dyndbg, ___dyndbg) \
384 * Data section helpers
386 #define NOSAVE_DATA \
387 . = ALIGN(PAGE_SIZE); \
388 __nosave_begin = .; \
390 . = ALIGN(PAGE_SIZE); \
393 #define PAGE_ALIGNED_DATA(page_align) \
394 . = ALIGN(page_align); \
395 *(.data..page_aligned) \
396 . = ALIGN(page_align);
398 #define READ_MOSTLY_DATA(align) \
400 *(.data..read_mostly) \
403 #define CACHELINE_ALIGNED_DATA(align) \
405 *(.data..cacheline_aligned)
407 #define INIT_TASK_DATA(align) \
409 __start_init_task = .; \
410 init_thread_union = .; \
412 KEEP(*(.data..init_task)) \
413 KEEP(*(.data..init_thread_info)) \
414 . = __start_init_task + THREAD_SIZE; \
417 #define JUMP_TABLE_DATA \
419 BOUNDED_SECTION_BY(__jump_table, ___jump_table)
421 #ifdef CONFIG_HAVE_STATIC_CALL_INLINE
422 #define STATIC_CALL_DATA \
424 BOUNDED_SECTION_BY(.static_call_sites, _static_call_sites) \
425 BOUNDED_SECTION_BY(.static_call_tramp_key, _static_call_tramp_key)
427 #define STATIC_CALL_DATA
431 * Allow architectures to handle ro_after_init data on their
432 * own by defining an empty RO_AFTER_INIT_DATA.
434 #ifndef RO_AFTER_INIT_DATA
435 #define RO_AFTER_INIT_DATA \
437 __start_ro_after_init = .; \
438 *(.data..ro_after_init) \
441 __end_ro_after_init = .;
445 * .kcfi_traps contains a list KCFI trap locations.
448 #ifdef CONFIG_ARCH_USES_CFI_TRAPS
450 __kcfi_traps : AT(ADDR(__kcfi_traps) - LOAD_OFFSET) { \
451 BOUNDED_SECTION_BY(.kcfi_traps, ___kcfi_traps) \
461 #define RO_DATA(align) \
462 . = ALIGN((align)); \
463 .rodata : AT(ADDR(.rodata) - LOAD_OFFSET) { \
464 __start_rodata = .; \
465 *(.rodata) *(.rodata.*) \
467 RO_AFTER_INIT_DATA /* Read only after init */ \
469 BOUNDED_SECTION_BY(__tracepoints_ptrs, ___tracepoints_ptrs) \
470 *(__tracepoints_strings)/* Tracepoints: strings */ \
473 .rodata1 : AT(ADDR(.rodata1) - LOAD_OFFSET) { \
478 .pci_fixup : AT(ADDR(.pci_fixup) - LOAD_OFFSET) { \
479 BOUNDED_SECTION_PRE_LABEL(.pci_fixup_early, _pci_fixups_early, __start, __end) \
480 BOUNDED_SECTION_PRE_LABEL(.pci_fixup_header, _pci_fixups_header, __start, __end) \
481 BOUNDED_SECTION_PRE_LABEL(.pci_fixup_final, _pci_fixups_final, __start, __end) \
482 BOUNDED_SECTION_PRE_LABEL(.pci_fixup_enable, _pci_fixups_enable, __start, __end) \
483 BOUNDED_SECTION_PRE_LABEL(.pci_fixup_resume, _pci_fixups_resume, __start, __end) \
484 BOUNDED_SECTION_PRE_LABEL(.pci_fixup_suspend, _pci_fixups_suspend, __start, __end) \
485 BOUNDED_SECTION_PRE_LABEL(.pci_fixup_resume_early, _pci_fixups_resume_early, __start, __end) \
486 BOUNDED_SECTION_PRE_LABEL(.pci_fixup_suspend_late, _pci_fixups_suspend_late, __start, __end) \
489 FW_LOADER_BUILT_IN_DATA \
494 /* Kernel symbol table: Normal symbols */ \
495 __ksymtab : AT(ADDR(__ksymtab) - LOAD_OFFSET) { \
496 __start___ksymtab = .; \
497 KEEP(*(SORT(___ksymtab+*))) \
498 __stop___ksymtab = .; \
501 /* Kernel symbol table: GPL-only symbols */ \
502 __ksymtab_gpl : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) { \
503 __start___ksymtab_gpl = .; \
504 KEEP(*(SORT(___ksymtab_gpl+*))) \
505 __stop___ksymtab_gpl = .; \
508 /* Kernel symbol table: Normal symbols */ \
509 __kcrctab : AT(ADDR(__kcrctab) - LOAD_OFFSET) { \
510 __start___kcrctab = .; \
511 KEEP(*(SORT(___kcrctab+*))) \
512 __stop___kcrctab = .; \
515 /* Kernel symbol table: GPL-only symbols */ \
516 __kcrctab_gpl : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) { \
517 __start___kcrctab_gpl = .; \
518 KEEP(*(SORT(___kcrctab_gpl+*))) \
519 __stop___kcrctab_gpl = .; \
522 /* Kernel symbol table: strings */ \
523 __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \
524 *(__ksymtab_strings) \
527 /* __*init sections */ \
528 __init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) { \
530 MEM_KEEP(init.rodata) \
531 MEM_KEEP(exit.rodata) \
534 /* Built-in module parameters. */ \
535 __param : AT(ADDR(__param) - LOAD_OFFSET) { \
536 BOUNDED_SECTION_BY(__param, ___param) \
539 /* Built-in module versions. */ \
540 __modver : AT(ADDR(__modver) - LOAD_OFFSET) { \
541 BOUNDED_SECTION_BY(__modver, ___modver) \
550 . = ALIGN((align)); \
555 * Non-instrumentable text section
557 #define NOINSTR_TEXT \
559 __noinstr_text_start = .; \
561 __cpuidle_text_start = .; \
563 __cpuidle_text_end = .; \
564 __noinstr_text_end = .;
567 * .text section. Map to function alignment to avoid address changes
568 * during second ld run in second ld pass when generating System.map
570 * TEXT_MAIN here will match .text.fixup and .text.unlikely if dead
571 * code elimination is enabled, so these sections should be converted
576 *(.text.hot .text.hot.*) \
577 *(TEXT_MAIN .text.fixup) \
578 *(.text.unlikely .text.unlikely.*) \
579 *(.text.unknown .text.unknown.*) \
583 *(.text.asan.* .text.tsan.*) \
584 MEM_KEEP(init.text*) \
585 MEM_KEEP(exit.text*) \
588 /* sched.text is aling to function alignment to secure we have same
589 * address even at second ld pass when generating System.map */
592 __sched_text_start = .; \
594 __sched_text_end = .;
596 /* spinlock.text is aling to function alignment to secure we have same
597 * address even at second ld pass when generating System.map */
600 __lock_text_start = .; \
604 #define KPROBES_TEXT \
606 __kprobes_text_start = .; \
608 __kprobes_text_end = .;
612 __entry_text_start = .; \
614 __entry_text_end = .;
616 #define IRQENTRY_TEXT \
618 __irqentry_text_start = .; \
620 __irqentry_text_end = .;
622 #define SOFTIRQENTRY_TEXT \
624 __softirqentry_text_start = .; \
625 *(.softirqentry.text) \
626 __softirqentry_text_end = .;
628 #define STATIC_CALL_TEXT \
630 __static_call_text_start = .; \
631 *(.static_call.text) \
632 __static_call_text_end = .;
634 /* Section used for early init (in .S files) */
635 #define HEAD_TEXT KEEP(*(.head.text))
637 #define HEAD_TEXT_SECTION \
638 .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) { \
645 #define EXCEPTION_TABLE(align) \
647 __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) { \
648 BOUNDED_SECTION_BY(__ex_table, ___ex_table) \
654 #ifdef CONFIG_DEBUG_INFO_BTF
656 .BTF : AT(ADDR(.BTF) - LOAD_OFFSET) { \
657 BOUNDED_SECTION_BY(.BTF, _BTF) \
660 .BTF_ids : AT(ADDR(.BTF_ids) - LOAD_OFFSET) { \
670 #define INIT_TASK_DATA_SECTION(align) \
672 .data..init_task : AT(ADDR(.data..init_task) - LOAD_OFFSET) { \
673 INIT_TASK_DATA(align) \
676 #ifdef CONFIG_CONSTRUCTORS
677 #define KERNEL_CTORS() . = ALIGN(8); \
679 KEEP(*(SORT(.ctors.*))) \
681 KEEP(*(SORT(.init_array.*))) \
682 KEEP(*(.init_array)) \
685 #define KERNEL_CTORS()
688 /* init and exit section handling */
690 KEEP(*(SORT(___kentry+*))) \
691 *(.init.data init.data.*) \
692 MEM_DISCARD(init.data*) \
695 *(.init.rodata .init.rodata.*) \
699 ERROR_INJECT_WHITELIST() \
700 MEM_DISCARD(init.rodata) \
702 RESERVEDMEM_OF_TABLES() \
704 CPU_METHOD_OF_TABLES() \
705 CPUIDLE_METHOD_OF_TABLES() \
707 IRQCHIP_OF_MATCH_TABLE() \
708 ACPI_PROBE_TABLE(irqchip) \
709 ACPI_PROBE_TABLE(timer) \
710 THERMAL_TABLE(governor) \
717 *(.init.text .init.text.*) \
719 MEM_DISCARD(init.text*)
722 *(.exit.data .exit.data.*) \
723 *(.fini_array .fini_array.*) \
725 MEM_DISCARD(exit.data*) \
726 MEM_DISCARD(exit.rodata*)
731 MEM_DISCARD(exit.text)
737 * bss (Block Started by Symbol) - uninitialized data
738 * zeroed during startup
740 #define SBSS(sbss_align) \
741 . = ALIGN(sbss_align); \
742 .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) { \
749 * Allow archectures to redefine BSS_FIRST_SECTIONS to add extra
750 * sections to the front of bss.
752 #ifndef BSS_FIRST_SECTIONS
753 #define BSS_FIRST_SECTIONS
756 #define BSS(bss_align) \
757 . = ALIGN(bss_align); \
758 .bss : AT(ADDR(.bss) - LOAD_OFFSET) { \
760 . = ALIGN(PAGE_SIZE); \
761 *(.bss..page_aligned) \
762 . = ALIGN(PAGE_SIZE); \
769 * DWARF debug sections.
770 * Symbols in the DWARF debugging sections are relative to
771 * the beginning of the section so we begin them at 0.
773 #define DWARF_DEBUG \
775 .debug 0 : { *(.debug) } \
776 .line 0 : { *(.line) } \
777 /* GNU DWARF 1 extensions */ \
778 .debug_srcinfo 0 : { *(.debug_srcinfo) } \
779 .debug_sfnames 0 : { *(.debug_sfnames) } \
780 /* DWARF 1.1 and DWARF 2 */ \
781 .debug_aranges 0 : { *(.debug_aranges) } \
782 .debug_pubnames 0 : { *(.debug_pubnames) } \
784 .debug_info 0 : { *(.debug_info \
785 .gnu.linkonce.wi.*) } \
786 .debug_abbrev 0 : { *(.debug_abbrev) } \
787 .debug_line 0 : { *(.debug_line) } \
788 .debug_frame 0 : { *(.debug_frame) } \
789 .debug_str 0 : { *(.debug_str) } \
790 .debug_loc 0 : { *(.debug_loc) } \
791 .debug_macinfo 0 : { *(.debug_macinfo) } \
792 .debug_pubtypes 0 : { *(.debug_pubtypes) } \
794 .debug_ranges 0 : { *(.debug_ranges) } \
795 /* SGI/MIPS DWARF 2 extensions */ \
796 .debug_weaknames 0 : { *(.debug_weaknames) } \
797 .debug_funcnames 0 : { *(.debug_funcnames) } \
798 .debug_typenames 0 : { *(.debug_typenames) } \
799 .debug_varnames 0 : { *(.debug_varnames) } \
800 /* GNU DWARF 2 extensions */ \
801 .debug_gnu_pubnames 0 : { *(.debug_gnu_pubnames) } \
802 .debug_gnu_pubtypes 0 : { *(.debug_gnu_pubtypes) } \
804 .debug_types 0 : { *(.debug_types) } \
806 .debug_addr 0 : { *(.debug_addr) } \
807 .debug_line_str 0 : { *(.debug_line_str) } \
808 .debug_loclists 0 : { *(.debug_loclists) } \
809 .debug_macro 0 : { *(.debug_macro) } \
810 .debug_names 0 : { *(.debug_names) } \
811 .debug_rnglists 0 : { *(.debug_rnglists) } \
812 .debug_str_offsets 0 : { *(.debug_str_offsets) }
814 /* Stabs debugging sections. */
815 #define STABS_DEBUG \
816 .stab 0 : { *(.stab) } \
817 .stabstr 0 : { *(.stabstr) } \
818 .stab.excl 0 : { *(.stab.excl) } \
819 .stab.exclstr 0 : { *(.stab.exclstr) } \
820 .stab.index 0 : { *(.stab.index) } \
821 .stab.indexstr 0 : { *(.stab.indexstr) }
823 /* Required sections not related to debugging. */
824 #define ELF_DETAILS \
825 .comment 0 : { *(.comment) } \
826 .symtab 0 : { *(.symtab) } \
827 .strtab 0 : { *(.strtab) } \
828 .shstrtab 0 : { *(.shstrtab) }
830 #ifdef CONFIG_GENERIC_BUG
833 __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) { \
834 BOUNDED_SECTION_BY(__bug_table, ___bug_table) \
840 #ifdef CONFIG_UNWINDER_ORC
841 #define ORC_UNWIND_TABLE \
843 .orc_unwind_ip : AT(ADDR(.orc_unwind_ip) - LOAD_OFFSET) { \
844 BOUNDED_SECTION_BY(.orc_unwind_ip, _orc_unwind_ip) \
847 .orc_unwind : AT(ADDR(.orc_unwind) - LOAD_OFFSET) { \
848 BOUNDED_SECTION_BY(.orc_unwind, _orc_unwind) \
850 text_size = _etext - _stext; \
852 .orc_lookup : AT(ADDR(.orc_lookup) - LOAD_OFFSET) { \
854 . += (((text_size + LOOKUP_BLOCK_SIZE - 1) / \
855 LOOKUP_BLOCK_SIZE) + 1) * 4; \
856 orc_lookup_end = .; \
859 #define ORC_UNWIND_TABLE
862 /* Built-in firmware blobs */
863 #ifdef CONFIG_FW_LOADER
864 #define FW_LOADER_BUILT_IN_DATA \
865 .builtin_fw : AT(ADDR(.builtin_fw) - LOAD_OFFSET) ALIGN(8) { \
866 BOUNDED_SECTION_PRE_LABEL(.builtin_fw, _builtin_fw, __start, __end) \
869 #define FW_LOADER_BUILT_IN_DATA
872 #ifdef CONFIG_PM_TRACE
875 .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) { \
876 BOUNDED_SECTION_POST_LABEL(.tracedata, __tracedata, _start, _end) \
882 #ifdef CONFIG_PRINTK_INDEX
883 #define PRINTK_INDEX \
884 .printk_index : AT(ADDR(.printk_index) - LOAD_OFFSET) { \
885 BOUNDED_SECTION_BY(.printk_index, _printk_index) \
892 * Discard .note.GNU-stack, which is emitted as PROGBITS by the compiler.
893 * Otherwise, the type of .notes section would become PROGBITS instead of NOTES.
896 /DISCARD/ : { *(.note.GNU-stack) } \
897 .notes : AT(ADDR(.notes) - LOAD_OFFSET) { \
898 BOUNDED_SECTION_BY(.note.*, _notes) \
900 NOTES_HEADERS_RESTORE
902 #define INIT_SETUP(initsetup_align) \
903 . = ALIGN(initsetup_align); \
904 BOUNDED_SECTION_POST_LABEL(.init.setup, __setup, _start, _end)
906 #define INIT_CALLS_LEVEL(level) \
907 __initcall##level##_start = .; \
908 KEEP(*(.initcall##level##.init)) \
909 KEEP(*(.initcall##level##s.init)) \
912 __initcall_start = .; \
913 KEEP(*(.initcallearly.init)) \
914 INIT_CALLS_LEVEL(0) \
915 INIT_CALLS_LEVEL(1) \
916 INIT_CALLS_LEVEL(2) \
917 INIT_CALLS_LEVEL(3) \
918 INIT_CALLS_LEVEL(4) \
919 INIT_CALLS_LEVEL(5) \
920 INIT_CALLS_LEVEL(rootfs) \
921 INIT_CALLS_LEVEL(6) \
922 INIT_CALLS_LEVEL(7) \
925 #define CON_INITCALL \
926 BOUNDED_SECTION_POST_LABEL(.con_initcall.init, __con_initcall, _start, _end)
928 /* Alignment must be consistent with (kunit_suite *) in include/kunit/test.h */
929 #define KUNIT_TABLE() \
931 BOUNDED_SECTION_POST_LABEL(.kunit_test_suites, __kunit_suites, _start, _end)
933 #ifdef CONFIG_BLK_DEV_INITRD
934 #define INIT_RAM_FS \
936 __initramfs_start = .; \
937 KEEP(*(.init.ramfs)) \
939 KEEP(*(.init.ramfs.info))
945 * Memory encryption operates on a page basis. Since we need to clear
946 * the memory encryption mask for this section, it needs to be aligned
947 * on a page boundary and be a page-size multiple in length.
949 * Note: We use a separate section so that only this section gets
950 * decrypted to avoid exposing more than we wish.
952 #ifdef CONFIG_AMD_MEM_ENCRYPT
953 #define PERCPU_DECRYPTED_SECTION \
954 . = ALIGN(PAGE_SIZE); \
955 *(.data..percpu..decrypted) \
956 . = ALIGN(PAGE_SIZE);
958 #define PERCPU_DECRYPTED_SECTION
963 * Default discarded sections.
965 * Some archs want to discard exit text/data at runtime rather than
966 * link time due to cross-section references such as alt instructions,
967 * bug table, eh_frame, etc. DISCARDS must be the last of output
968 * section definitions so that such archs put those in earlier section
971 #ifdef RUNTIME_DISCARD_EXIT
972 #define EXIT_DISCARDS
974 #define EXIT_DISCARDS \
980 * Clang's -fprofile-arcs, -fsanitize=kernel-address, and
981 * -fsanitize=thread produce unwanted sections (.eh_frame
982 * and .init_array.*), but CONFIG_CONSTRUCTORS wants to
983 * keep any .init_array.* sections.
984 * https://bugs.llvm.org/show_bug.cgi?id=46478
986 #ifdef CONFIG_UNWIND_TABLES
987 #define DISCARD_EH_FRAME
989 #define DISCARD_EH_FRAME *(.eh_frame)
991 #if defined(CONFIG_GCOV_KERNEL) || defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KCSAN)
992 # ifdef CONFIG_CONSTRUCTORS
993 # define SANITIZER_DISCARDS \
996 # define SANITIZER_DISCARDS \
997 *(.init_array) *(.init_array.*) \
1001 # define SANITIZER_DISCARDS
1004 #define COMMON_DISCARDS \
1005 SANITIZER_DISCARDS \
1006 PATCHABLE_DISCARDS \
1010 /* ld.bfd warns about .gnu.version* even when not emitted */ \
1021 * PERCPU_INPUT - the percpu input sections
1022 * @cacheline: cacheline size
1024 * The core percpu section names and core symbols which do not rely
1025 * directly upon load addresses.
1027 * @cacheline is used to align subsections to avoid false cacheline
1028 * sharing between subsections for different purposes.
1030 #define PERCPU_INPUT(cacheline) \
1031 __per_cpu_start = .; \
1032 *(.data..percpu..first) \
1033 . = ALIGN(PAGE_SIZE); \
1034 *(.data..percpu..page_aligned) \
1035 . = ALIGN(cacheline); \
1036 *(.data..percpu..read_mostly) \
1037 . = ALIGN(cacheline); \
1039 *(.data..percpu..shared_aligned) \
1040 PERCPU_DECRYPTED_SECTION \
1044 * PERCPU_VADDR - define output section for percpu area
1045 * @cacheline: cacheline size
1046 * @vaddr: explicit base address (optional)
1047 * @phdr: destination PHDR (optional)
1049 * Macro which expands to output section for percpu area.
1051 * @cacheline is used to align subsections to avoid false cacheline
1052 * sharing between subsections for different purposes.
1054 * If @vaddr is not blank, it specifies explicit base address and all
1055 * percpu symbols will be offset from the given address. If blank,
1056 * @vaddr always equals @laddr + LOAD_OFFSET.
1058 * @phdr defines the output PHDR to use if not blank. Be warned that
1059 * output PHDR is sticky. If @phdr is specified, the next output
1060 * section in the linker script will go there too. @phdr should have
1063 * Note that this macros defines __per_cpu_load as an absolute symbol.
1064 * If there is no need to put the percpu section at a predetermined
1065 * address, use PERCPU_SECTION.
1067 #define PERCPU_VADDR(cacheline, vaddr, phdr) \
1068 __per_cpu_load = .; \
1069 .data..percpu vaddr : AT(__per_cpu_load - LOAD_OFFSET) { \
1070 PERCPU_INPUT(cacheline) \
1072 . = __per_cpu_load + SIZEOF(.data..percpu);
1075 * PERCPU_SECTION - define output section for percpu area, simple version
1076 * @cacheline: cacheline size
1078 * Align to PAGE_SIZE and outputs output section for percpu area. This
1079 * macro doesn't manipulate @vaddr or @phdr and __per_cpu_load and
1080 * __per_cpu_start will be identical.
1082 * This macro is equivalent to ALIGN(PAGE_SIZE); PERCPU_VADDR(@cacheline,,)
1083 * except that __per_cpu_load is defined as a relative symbol against
1084 * .data..percpu which is required for relocatable x86_32 configuration.
1086 #define PERCPU_SECTION(cacheline) \
1087 . = ALIGN(PAGE_SIZE); \
1088 .data..percpu : AT(ADDR(.data..percpu) - LOAD_OFFSET) { \
1089 __per_cpu_load = .; \
1090 PERCPU_INPUT(cacheline) \
1095 * Definition of the high level *_SECTION macros
1096 * They will fit only a subset of the architectures
1102 * All sections are combined in a single .data section.
1103 * The sections following CONSTRUCTORS are arranged so their
1104 * typical alignment matches.
1105 * A cacheline is typical/always less than a PAGE_SIZE so
1106 * the sections that has this restriction (or similar)
1107 * is located before the ones requiring PAGE_SIZE alignment.
1108 * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which
1109 * matches the requirement of PAGE_ALIGNED_DATA.
1111 * use 0 as page_align if page_aligned data is not used */
1112 #define RW_DATA(cacheline, pagealigned, inittask) \
1113 . = ALIGN(PAGE_SIZE); \
1114 .data : AT(ADDR(.data) - LOAD_OFFSET) { \
1115 INIT_TASK_DATA(inittask) \
1117 PAGE_ALIGNED_DATA(pagealigned) \
1118 CACHELINE_ALIGNED_DATA(cacheline) \
1119 READ_MOSTLY_DATA(cacheline) \
1125 #define INIT_TEXT_SECTION(inittext_align) \
1126 . = ALIGN(inittext_align); \
1127 .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) { \
1133 #define INIT_DATA_SECTION(initsetup_align) \
1134 .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) { \
1136 INIT_SETUP(initsetup_align) \
1142 #define BSS_SECTION(sbss_align, bss_align, stop_align) \
1143 . = ALIGN(sbss_align); \
1147 . = ALIGN(stop_align); \