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)
26 * RO_DATA_SECTION(PAGE_SIZE)
27 * RW_DATA_SECTION(...)
30 * EXCEPTION_TABLE(...)
33 * 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
57 #include <linux/export.h>
59 /* Align . to a 8 byte boundary equals to maximum function alignment. */
60 #define ALIGN_FUNCTION() . = ALIGN(8)
63 * LD_DEAD_CODE_DATA_ELIMINATION option enables -fdata-sections, which
64 * generates .data.identifier sections, which need to be pulled in with
65 * .data. We don't want to pull in .data..other sections, which Linux
66 * has defined. Same for text and bss.
68 * RODATA_MAIN is not used because existing code already defines .rodata.x
69 * sections to be brought in with rodata.
71 #ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
72 #define TEXT_MAIN .text .text.[0-9a-zA-Z_]*
73 #define DATA_MAIN .data .data.[0-9a-zA-Z_]*
74 #define SDATA_MAIN .sdata .sdata.[0-9a-zA-Z_]*
75 #define RODATA_MAIN .rodata .rodata.[0-9a-zA-Z_]*
76 #define BSS_MAIN .bss .bss.[0-9a-zA-Z_]*
77 #define SBSS_MAIN .sbss .sbss.[0-9a-zA-Z_]*
79 #define TEXT_MAIN .text
80 #define DATA_MAIN .data
81 #define SDATA_MAIN .sdata
82 #define RODATA_MAIN .rodata
84 #define SBSS_MAIN .sbss
88 * Align to a 32 byte boundary equal to the
89 * alignment gcc 4.5 uses for a struct
91 #define STRUCT_ALIGNMENT 32
92 #define STRUCT_ALIGN() . = ALIGN(STRUCT_ALIGNMENT)
94 /* The actual configuration determine if the init/exit sections
95 * are handled as text/data or they can be discarded (which
96 * often happens at runtime)
98 #ifdef CONFIG_HOTPLUG_CPU
99 #define CPU_KEEP(sec) *(.cpu##sec)
100 #define CPU_DISCARD(sec)
102 #define CPU_KEEP(sec)
103 #define CPU_DISCARD(sec) *(.cpu##sec)
106 #if defined(CONFIG_MEMORY_HOTPLUG)
107 #define MEM_KEEP(sec) *(.mem##sec)
108 #define MEM_DISCARD(sec)
110 #define MEM_KEEP(sec)
111 #define MEM_DISCARD(sec) *(.mem##sec)
114 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
115 #define MCOUNT_REC() . = ALIGN(8); \
116 __start_mcount_loc = .; \
117 KEEP(*(__mcount_loc)) \
118 __stop_mcount_loc = .;
123 #ifdef CONFIG_TRACE_BRANCH_PROFILING
124 #define LIKELY_PROFILE() __start_annotated_branch_profile = .; \
125 KEEP(*(_ftrace_annotated_branch)) \
126 __stop_annotated_branch_profile = .;
128 #define LIKELY_PROFILE()
131 #ifdef CONFIG_PROFILE_ALL_BRANCHES
132 #define BRANCH_PROFILE() __start_branch_profile = .; \
133 KEEP(*(_ftrace_branch)) \
134 __stop_branch_profile = .;
136 #define BRANCH_PROFILE()
139 #ifdef CONFIG_KPROBES
140 #define KPROBE_BLACKLIST() . = ALIGN(8); \
141 __start_kprobe_blacklist = .; \
142 KEEP(*(_kprobe_blacklist)) \
143 __stop_kprobe_blacklist = .;
145 #define KPROBE_BLACKLIST()
148 #ifdef CONFIG_FUNCTION_ERROR_INJECTION
149 #define ERROR_INJECT_WHITELIST() STRUCT_ALIGN(); \
150 __start_error_injection_whitelist = .; \
151 KEEP(*(_error_injection_whitelist)) \
152 __stop_error_injection_whitelist = .;
154 #define ERROR_INJECT_WHITELIST()
157 #ifdef CONFIG_EVENT_TRACING
158 #define FTRACE_EVENTS() . = ALIGN(8); \
159 __start_ftrace_events = .; \
160 KEEP(*(_ftrace_events)) \
161 __stop_ftrace_events = .; \
162 __start_ftrace_eval_maps = .; \
163 KEEP(*(_ftrace_eval_map)) \
164 __stop_ftrace_eval_maps = .;
166 #define FTRACE_EVENTS()
169 #ifdef CONFIG_TRACING
170 #define TRACE_PRINTKS() __start___trace_bprintk_fmt = .; \
171 KEEP(*(__trace_printk_fmt)) /* Trace_printk fmt' pointer */ \
172 __stop___trace_bprintk_fmt = .;
173 #define TRACEPOINT_STR() __start___tracepoint_str = .; \
174 KEEP(*(__tracepoint_str)) /* Trace_printk fmt' pointer */ \
175 __stop___tracepoint_str = .;
177 #define TRACE_PRINTKS()
178 #define TRACEPOINT_STR()
181 #ifdef CONFIG_FTRACE_SYSCALLS
182 #define TRACE_SYSCALLS() . = ALIGN(8); \
183 __start_syscalls_metadata = .; \
184 KEEP(*(__syscalls_metadata)) \
185 __stop_syscalls_metadata = .;
187 #define TRACE_SYSCALLS()
190 #ifdef CONFIG_BPF_EVENTS
191 #define BPF_RAW_TP() STRUCT_ALIGN(); \
192 __start__bpf_raw_tp = .; \
193 KEEP(*(__bpf_raw_tp_map)) \
194 __stop__bpf_raw_tp = .;
199 #ifdef CONFIG_SERIAL_EARLYCON
200 #define EARLYCON_TABLE() . = ALIGN(8); \
201 __earlycon_table = .; \
202 KEEP(*(__earlycon_table)) \
203 __earlycon_table_end = .;
205 #define EARLYCON_TABLE()
208 #define ___OF_TABLE(cfg, name) _OF_TABLE_##cfg(name)
209 #define __OF_TABLE(cfg, name) ___OF_TABLE(cfg, name)
210 #define OF_TABLE(cfg, name) __OF_TABLE(IS_ENABLED(cfg), name)
211 #define _OF_TABLE_0(name)
212 #define _OF_TABLE_1(name) \
214 __##name##_of_table = .; \
215 KEEP(*(__##name##_of_table)) \
216 KEEP(*(__##name##_of_table_end))
218 #define TIMER_OF_TABLES() OF_TABLE(CONFIG_TIMER_OF, timer)
219 #define IRQCHIP_OF_MATCH_TABLE() OF_TABLE(CONFIG_IRQCHIP, irqchip)
220 #define CLK_OF_TABLES() OF_TABLE(CONFIG_COMMON_CLK, clk)
221 #define RESERVEDMEM_OF_TABLES() OF_TABLE(CONFIG_OF_RESERVED_MEM, reservedmem)
222 #define CPU_METHOD_OF_TABLES() OF_TABLE(CONFIG_SMP, cpu_method)
223 #define CPUIDLE_METHOD_OF_TABLES() OF_TABLE(CONFIG_CPU_IDLE, cpuidle_method)
226 #define ACPI_PROBE_TABLE(name) \
228 __##name##_acpi_probe_table = .; \
229 KEEP(*(__##name##_acpi_probe_table)) \
230 __##name##_acpi_probe_table_end = .;
232 #define ACPI_PROBE_TABLE(name)
235 #define KERNEL_DTB() \
238 KEEP(*(.dtb.init.rodata)) \
248 *(.data..shared_aligned) /* percpu related */ \
249 MEM_KEEP(init.data*) \
250 MEM_KEEP(exit.data*) \
257 /* implement dynamic printk debug */ \
259 __start___jump_table = .; \
260 KEEP(*(__jump_table)) \
261 __stop___jump_table = .; \
263 __start___verbose = .; \
265 __stop___verbose = .; \
273 * Data section helpers
275 #define NOSAVE_DATA \
276 . = ALIGN(PAGE_SIZE); \
277 __nosave_begin = .; \
279 . = ALIGN(PAGE_SIZE); \
282 #define PAGE_ALIGNED_DATA(page_align) \
283 . = ALIGN(page_align); \
284 *(.data..page_aligned)
286 #define READ_MOSTLY_DATA(align) \
288 *(.data..read_mostly) \
291 #define CACHELINE_ALIGNED_DATA(align) \
293 *(.data..cacheline_aligned)
295 #define INIT_TASK_DATA(align) \
297 __start_init_task = .; \
298 init_thread_union = .; \
300 KEEP(*(.data..init_task)) \
301 KEEP(*(.data..init_thread_info)) \
302 . = __start_init_task + THREAD_SIZE; \
306 * Allow architectures to handle ro_after_init data on their
307 * own by defining an empty RO_AFTER_INIT_DATA.
309 #ifndef RO_AFTER_INIT_DATA
310 #define RO_AFTER_INIT_DATA \
311 __start_ro_after_init = .; \
312 *(.data..ro_after_init) \
313 __end_ro_after_init = .;
319 #define RO_DATA_SECTION(align) \
320 . = ALIGN((align)); \
321 .rodata : AT(ADDR(.rodata) - LOAD_OFFSET) { \
322 __start_rodata = .; \
323 *(.rodata) *(.rodata.*) \
324 RO_AFTER_INIT_DATA /* Read only after init */ \
325 KEEP(*(__vermagic)) /* Kernel version magic */ \
327 __start___tracepoints_ptrs = .; \
328 KEEP(*(__tracepoints_ptrs)) /* Tracepoints: pointer array */ \
329 __stop___tracepoints_ptrs = .; \
330 *(__tracepoints_strings)/* Tracepoints: strings */ \
333 .rodata1 : AT(ADDR(.rodata1) - LOAD_OFFSET) { \
338 .pci_fixup : AT(ADDR(.pci_fixup) - LOAD_OFFSET) { \
339 __start_pci_fixups_early = .; \
340 KEEP(*(.pci_fixup_early)) \
341 __end_pci_fixups_early = .; \
342 __start_pci_fixups_header = .; \
343 KEEP(*(.pci_fixup_header)) \
344 __end_pci_fixups_header = .; \
345 __start_pci_fixups_final = .; \
346 KEEP(*(.pci_fixup_final)) \
347 __end_pci_fixups_final = .; \
348 __start_pci_fixups_enable = .; \
349 KEEP(*(.pci_fixup_enable)) \
350 __end_pci_fixups_enable = .; \
351 __start_pci_fixups_resume = .; \
352 KEEP(*(.pci_fixup_resume)) \
353 __end_pci_fixups_resume = .; \
354 __start_pci_fixups_resume_early = .; \
355 KEEP(*(.pci_fixup_resume_early)) \
356 __end_pci_fixups_resume_early = .; \
357 __start_pci_fixups_suspend = .; \
358 KEEP(*(.pci_fixup_suspend)) \
359 __end_pci_fixups_suspend = .; \
360 __start_pci_fixups_suspend_late = .; \
361 KEEP(*(.pci_fixup_suspend_late)) \
362 __end_pci_fixups_suspend_late = .; \
365 /* Built-in firmware blobs */ \
366 .builtin_fw : AT(ADDR(.builtin_fw) - LOAD_OFFSET) { \
367 __start_builtin_fw = .; \
368 KEEP(*(.builtin_fw)) \
369 __end_builtin_fw = .; \
374 /* Kernel symbol table: Normal symbols */ \
375 __ksymtab : AT(ADDR(__ksymtab) - LOAD_OFFSET) { \
376 __start___ksymtab = .; \
377 KEEP(*(SORT(___ksymtab+*))) \
378 __stop___ksymtab = .; \
381 /* Kernel symbol table: GPL-only symbols */ \
382 __ksymtab_gpl : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) { \
383 __start___ksymtab_gpl = .; \
384 KEEP(*(SORT(___ksymtab_gpl+*))) \
385 __stop___ksymtab_gpl = .; \
388 /* Kernel symbol table: Normal unused symbols */ \
389 __ksymtab_unused : AT(ADDR(__ksymtab_unused) - LOAD_OFFSET) { \
390 __start___ksymtab_unused = .; \
391 KEEP(*(SORT(___ksymtab_unused+*))) \
392 __stop___ksymtab_unused = .; \
395 /* Kernel symbol table: GPL-only unused symbols */ \
396 __ksymtab_unused_gpl : AT(ADDR(__ksymtab_unused_gpl) - LOAD_OFFSET) { \
397 __start___ksymtab_unused_gpl = .; \
398 KEEP(*(SORT(___ksymtab_unused_gpl+*))) \
399 __stop___ksymtab_unused_gpl = .; \
402 /* Kernel symbol table: GPL-future-only symbols */ \
403 __ksymtab_gpl_future : AT(ADDR(__ksymtab_gpl_future) - LOAD_OFFSET) { \
404 __start___ksymtab_gpl_future = .; \
405 KEEP(*(SORT(___ksymtab_gpl_future+*))) \
406 __stop___ksymtab_gpl_future = .; \
409 /* Kernel symbol table: Normal symbols */ \
410 __kcrctab : AT(ADDR(__kcrctab) - LOAD_OFFSET) { \
411 __start___kcrctab = .; \
412 KEEP(*(SORT(___kcrctab+*))) \
413 __stop___kcrctab = .; \
416 /* Kernel symbol table: GPL-only symbols */ \
417 __kcrctab_gpl : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) { \
418 __start___kcrctab_gpl = .; \
419 KEEP(*(SORT(___kcrctab_gpl+*))) \
420 __stop___kcrctab_gpl = .; \
423 /* Kernel symbol table: Normal unused symbols */ \
424 __kcrctab_unused : AT(ADDR(__kcrctab_unused) - LOAD_OFFSET) { \
425 __start___kcrctab_unused = .; \
426 KEEP(*(SORT(___kcrctab_unused+*))) \
427 __stop___kcrctab_unused = .; \
430 /* Kernel symbol table: GPL-only unused symbols */ \
431 __kcrctab_unused_gpl : AT(ADDR(__kcrctab_unused_gpl) - LOAD_OFFSET) { \
432 __start___kcrctab_unused_gpl = .; \
433 KEEP(*(SORT(___kcrctab_unused_gpl+*))) \
434 __stop___kcrctab_unused_gpl = .; \
437 /* Kernel symbol table: GPL-future-only symbols */ \
438 __kcrctab_gpl_future : AT(ADDR(__kcrctab_gpl_future) - LOAD_OFFSET) { \
439 __start___kcrctab_gpl_future = .; \
440 KEEP(*(SORT(___kcrctab_gpl_future+*))) \
441 __stop___kcrctab_gpl_future = .; \
444 /* Kernel symbol table: strings */ \
445 __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \
446 *(__ksymtab_strings) \
449 /* __*init sections */ \
450 __init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) { \
452 MEM_KEEP(init.rodata) \
453 MEM_KEEP(exit.rodata) \
456 /* Built-in module parameters. */ \
457 __param : AT(ADDR(__param) - LOAD_OFFSET) { \
458 __start___param = .; \
460 __stop___param = .; \
463 /* Built-in module versions. */ \
464 __modver : AT(ADDR(__modver) - LOAD_OFFSET) { \
465 __start___modver = .; \
467 __stop___modver = .; \
468 . = ALIGN((align)); \
473 /* RODATA & RO_DATA provided for backward compatibility.
474 * All archs are supposed to use RO_DATA() */
475 #define RODATA RO_DATA_SECTION(4096)
476 #define RO_DATA(align) RO_DATA_SECTION(align)
478 #define SECURITY_INIT \
479 .security_initcall.init : AT(ADDR(.security_initcall.init) - LOAD_OFFSET) { \
480 __security_initcall_start = .; \
481 KEEP(*(.security_initcall.init)) \
482 __security_initcall_end = .; \
486 * .text section. Map to function alignment to avoid address changes
487 * during second ld run in second ld pass when generating System.map
489 * TEXT_MAIN here will match .text.fixup and .text.unlikely if dead
490 * code elimination is enabled, so these sections should be converted
495 *(.text.hot TEXT_MAIN .text.fixup .text.unlikely) \
498 MEM_KEEP(init.text*) \
499 MEM_KEEP(exit.text*) \
502 /* sched.text is aling to function alignment to secure we have same
503 * address even at second ld pass when generating System.map */
506 __sched_text_start = .; \
508 __sched_text_end = .;
510 /* spinlock.text is aling to function alignment to secure we have same
511 * address even at second ld pass when generating System.map */
514 __lock_text_start = .; \
518 #define CPUIDLE_TEXT \
520 __cpuidle_text_start = .; \
522 __cpuidle_text_end = .;
524 #define KPROBES_TEXT \
526 __kprobes_text_start = .; \
528 __kprobes_text_end = .;
532 __entry_text_start = .; \
534 __entry_text_end = .;
536 #define IRQENTRY_TEXT \
538 __irqentry_text_start = .; \
540 __irqentry_text_end = .;
542 #define SOFTIRQENTRY_TEXT \
544 __softirqentry_text_start = .; \
545 *(.softirqentry.text) \
546 __softirqentry_text_end = .;
548 /* Section used for early init (in .S files) */
549 #define HEAD_TEXT KEEP(*(.head.text))
551 #define HEAD_TEXT_SECTION \
552 .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) { \
559 #define EXCEPTION_TABLE(align) \
561 __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) { \
562 __start___ex_table = .; \
563 KEEP(*(__ex_table)) \
564 __stop___ex_table = .; \
570 #define INIT_TASK_DATA_SECTION(align) \
572 .data..init_task : AT(ADDR(.data..init_task) - LOAD_OFFSET) { \
573 INIT_TASK_DATA(align) \
576 #ifdef CONFIG_CONSTRUCTORS
577 #define KERNEL_CTORS() . = ALIGN(8); \
580 KEEP(*(SORT(.init_array.*))) \
581 KEEP(*(.init_array)) \
584 #define KERNEL_CTORS()
587 /* init and exit section handling */
589 KEEP(*(SORT(___kentry+*))) \
590 *(.init.data init.data.*) \
591 MEM_DISCARD(init.data*) \
594 *(.init.rodata .init.rodata.*) \
598 ERROR_INJECT_WHITELIST() \
599 MEM_DISCARD(init.rodata) \
601 RESERVEDMEM_OF_TABLES() \
603 CPU_METHOD_OF_TABLES() \
604 CPUIDLE_METHOD_OF_TABLES() \
606 IRQCHIP_OF_MATCH_TABLE() \
607 ACPI_PROBE_TABLE(irqchip) \
608 ACPI_PROBE_TABLE(timer) \
612 *(.init.text .init.text.*) \
614 MEM_DISCARD(init.text*)
617 *(.exit.data .exit.data.*) \
620 MEM_DISCARD(exit.data*) \
621 MEM_DISCARD(exit.rodata*)
626 MEM_DISCARD(exit.text)
632 * bss (Block Started by Symbol) - uninitialized data
633 * zeroed during startup
635 #define SBSS(sbss_align) \
636 . = ALIGN(sbss_align); \
637 .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) { \
644 * Allow archectures to redefine BSS_FIRST_SECTIONS to add extra
645 * sections to the front of bss.
647 #ifndef BSS_FIRST_SECTIONS
648 #define BSS_FIRST_SECTIONS
651 #define BSS(bss_align) \
652 . = ALIGN(bss_align); \
653 .bss : AT(ADDR(.bss) - LOAD_OFFSET) { \
655 *(.bss..page_aligned) \
662 * DWARF debug sections.
663 * Symbols in the DWARF debugging sections are relative to
664 * the beginning of the section so we begin them at 0.
666 #define DWARF_DEBUG \
668 .debug 0 : { *(.debug) } \
669 .line 0 : { *(.line) } \
670 /* GNU DWARF 1 extensions */ \
671 .debug_srcinfo 0 : { *(.debug_srcinfo) } \
672 .debug_sfnames 0 : { *(.debug_sfnames) } \
673 /* DWARF 1.1 and DWARF 2 */ \
674 .debug_aranges 0 : { *(.debug_aranges) } \
675 .debug_pubnames 0 : { *(.debug_pubnames) } \
677 .debug_info 0 : { *(.debug_info \
678 .gnu.linkonce.wi.*) } \
679 .debug_abbrev 0 : { *(.debug_abbrev) } \
680 .debug_line 0 : { *(.debug_line) } \
681 .debug_frame 0 : { *(.debug_frame) } \
682 .debug_str 0 : { *(.debug_str) } \
683 .debug_loc 0 : { *(.debug_loc) } \
684 .debug_macinfo 0 : { *(.debug_macinfo) } \
685 .debug_pubtypes 0 : { *(.debug_pubtypes) } \
687 .debug_ranges 0 : { *(.debug_ranges) } \
688 /* SGI/MIPS DWARF 2 extensions */ \
689 .debug_weaknames 0 : { *(.debug_weaknames) } \
690 .debug_funcnames 0 : { *(.debug_funcnames) } \
691 .debug_typenames 0 : { *(.debug_typenames) } \
692 .debug_varnames 0 : { *(.debug_varnames) } \
693 /* GNU DWARF 2 extensions */ \
694 .debug_gnu_pubnames 0 : { *(.debug_gnu_pubnames) } \
695 .debug_gnu_pubtypes 0 : { *(.debug_gnu_pubtypes) } \
697 .debug_types 0 : { *(.debug_types) } \
699 .debug_macro 0 : { *(.debug_macro) } \
700 .debug_addr 0 : { *(.debug_addr) }
702 /* Stabs debugging sections. */
703 #define STABS_DEBUG \
704 .stab 0 : { *(.stab) } \
705 .stabstr 0 : { *(.stabstr) } \
706 .stab.excl 0 : { *(.stab.excl) } \
707 .stab.exclstr 0 : { *(.stab.exclstr) } \
708 .stab.index 0 : { *(.stab.index) } \
709 .stab.indexstr 0 : { *(.stab.indexstr) } \
710 .comment 0 : { *(.comment) }
712 #ifdef CONFIG_GENERIC_BUG
715 __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) { \
716 __start___bug_table = .; \
717 KEEP(*(__bug_table)) \
718 __stop___bug_table = .; \
724 #ifdef CONFIG_UNWINDER_ORC
725 #define ORC_UNWIND_TABLE \
727 .orc_unwind_ip : AT(ADDR(.orc_unwind_ip) - LOAD_OFFSET) { \
728 __start_orc_unwind_ip = .; \
729 KEEP(*(.orc_unwind_ip)) \
730 __stop_orc_unwind_ip = .; \
733 .orc_unwind : AT(ADDR(.orc_unwind) - LOAD_OFFSET) { \
734 __start_orc_unwind = .; \
735 KEEP(*(.orc_unwind)) \
736 __stop_orc_unwind = .; \
739 .orc_lookup : AT(ADDR(.orc_lookup) - LOAD_OFFSET) { \
741 . += (((SIZEOF(.text) + LOOKUP_BLOCK_SIZE - 1) / \
742 LOOKUP_BLOCK_SIZE) + 1) * 4; \
743 orc_lookup_end = .; \
746 #define ORC_UNWIND_TABLE
749 #ifdef CONFIG_PM_TRACE
752 .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) { \
753 __tracedata_start = .; \
754 KEEP(*(.tracedata)) \
755 __tracedata_end = .; \
762 .notes : AT(ADDR(.notes) - LOAD_OFFSET) { \
768 #define INIT_SETUP(initsetup_align) \
769 . = ALIGN(initsetup_align); \
771 KEEP(*(.init.setup)) \
774 #define INIT_CALLS_LEVEL(level) \
775 __initcall##level##_start = .; \
776 KEEP(*(.initcall##level##.init)) \
777 KEEP(*(.initcall##level##s.init)) \
780 __initcall_start = .; \
781 KEEP(*(.initcallearly.init)) \
782 INIT_CALLS_LEVEL(0) \
783 INIT_CALLS_LEVEL(1) \
784 INIT_CALLS_LEVEL(2) \
785 INIT_CALLS_LEVEL(3) \
786 INIT_CALLS_LEVEL(4) \
787 INIT_CALLS_LEVEL(5) \
788 INIT_CALLS_LEVEL(rootfs) \
789 INIT_CALLS_LEVEL(6) \
790 INIT_CALLS_LEVEL(7) \
793 #define CON_INITCALL \
794 __con_initcall_start = .; \
795 KEEP(*(.con_initcall.init)) \
796 __con_initcall_end = .;
798 #define SECURITY_INITCALL \
799 __security_initcall_start = .; \
800 KEEP(*(.security_initcall.init)) \
801 __security_initcall_end = .;
803 #ifdef CONFIG_BLK_DEV_INITRD
804 #define INIT_RAM_FS \
806 __initramfs_start = .; \
807 KEEP(*(.init.ramfs)) \
809 KEEP(*(.init.ramfs.info))
815 * Memory encryption operates on a page basis. Since we need to clear
816 * the memory encryption mask for this section, it needs to be aligned
817 * on a page boundary and be a page-size multiple in length.
819 * Note: We use a separate section so that only this section gets
820 * decrypted to avoid exposing more than we wish.
822 #ifdef CONFIG_AMD_MEM_ENCRYPT
823 #define PERCPU_DECRYPTED_SECTION \
824 . = ALIGN(PAGE_SIZE); \
825 *(.data..percpu..decrypted) \
826 . = ALIGN(PAGE_SIZE);
828 #define PERCPU_DECRYPTED_SECTION
833 * Default discarded sections.
835 * Some archs want to discard exit text/data at runtime rather than
836 * link time due to cross-section references such as alt instructions,
837 * bug table, eh_frame, etc. DISCARDS must be the last of output
838 * section definitions so that such archs put those in earlier section
851 * PERCPU_INPUT - the percpu input sections
852 * @cacheline: cacheline size
854 * The core percpu section names and core symbols which do not rely
855 * directly upon load addresses.
857 * @cacheline is used to align subsections to avoid false cacheline
858 * sharing between subsections for different purposes.
860 #define PERCPU_INPUT(cacheline) \
861 __per_cpu_start = .; \
862 *(.data..percpu..first) \
863 . = ALIGN(PAGE_SIZE); \
864 *(.data..percpu..page_aligned) \
865 . = ALIGN(cacheline); \
866 *(.data..percpu..read_mostly) \
867 . = ALIGN(cacheline); \
869 *(.data..percpu..shared_aligned) \
870 PERCPU_DECRYPTED_SECTION \
874 * PERCPU_VADDR - define output section for percpu area
875 * @cacheline: cacheline size
876 * @vaddr: explicit base address (optional)
877 * @phdr: destination PHDR (optional)
879 * Macro which expands to output section for percpu area.
881 * @cacheline is used to align subsections to avoid false cacheline
882 * sharing between subsections for different purposes.
884 * If @vaddr is not blank, it specifies explicit base address and all
885 * percpu symbols will be offset from the given address. If blank,
886 * @vaddr always equals @laddr + LOAD_OFFSET.
888 * @phdr defines the output PHDR to use if not blank. Be warned that
889 * output PHDR is sticky. If @phdr is specified, the next output
890 * section in the linker script will go there too. @phdr should have
893 * Note that this macros defines __per_cpu_load as an absolute symbol.
894 * If there is no need to put the percpu section at a predetermined
895 * address, use PERCPU_SECTION.
897 #define PERCPU_VADDR(cacheline, vaddr, phdr) \
898 __per_cpu_load = .; \
899 .data..percpu vaddr : AT(__per_cpu_load - LOAD_OFFSET) { \
900 PERCPU_INPUT(cacheline) \
902 . = __per_cpu_load + SIZEOF(.data..percpu);
905 * PERCPU_SECTION - define output section for percpu area, simple version
906 * @cacheline: cacheline size
908 * Align to PAGE_SIZE and outputs output section for percpu area. This
909 * macro doesn't manipulate @vaddr or @phdr and __per_cpu_load and
910 * __per_cpu_start will be identical.
912 * This macro is equivalent to ALIGN(PAGE_SIZE); PERCPU_VADDR(@cacheline,,)
913 * except that __per_cpu_load is defined as a relative symbol against
914 * .data..percpu which is required for relocatable x86_32 configuration.
916 #define PERCPU_SECTION(cacheline) \
917 . = ALIGN(PAGE_SIZE); \
918 .data..percpu : AT(ADDR(.data..percpu) - LOAD_OFFSET) { \
919 __per_cpu_load = .; \
920 PERCPU_INPUT(cacheline) \
925 * Definition of the high level *_SECTION macros
926 * They will fit only a subset of the architectures
932 * All sections are combined in a single .data section.
933 * The sections following CONSTRUCTORS are arranged so their
934 * typical alignment matches.
935 * A cacheline is typical/always less than a PAGE_SIZE so
936 * the sections that has this restriction (or similar)
937 * is located before the ones requiring PAGE_SIZE alignment.
938 * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which
939 * matches the requirement of PAGE_ALIGNED_DATA.
941 * use 0 as page_align if page_aligned data is not used */
942 #define RW_DATA_SECTION(cacheline, pagealigned, inittask) \
943 . = ALIGN(PAGE_SIZE); \
944 .data : AT(ADDR(.data) - LOAD_OFFSET) { \
945 INIT_TASK_DATA(inittask) \
947 PAGE_ALIGNED_DATA(pagealigned) \
948 CACHELINE_ALIGNED_DATA(cacheline) \
949 READ_MOSTLY_DATA(cacheline) \
955 #define INIT_TEXT_SECTION(inittext_align) \
956 . = ALIGN(inittext_align); \
957 .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) { \
963 #define INIT_DATA_SECTION(initsetup_align) \
964 .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) { \
966 INIT_SETUP(initsetup_align) \
973 #define BSS_SECTION(sbss_align, bss_align, stop_align) \
974 . = ALIGN(sbss_align); \
978 . = ALIGN(stop_align); \