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 /* Align . to a 8 byte boundary equals to maximum function alignment. */
58 #define ALIGN_FUNCTION() . = ALIGN(8)
61 * LD_DEAD_CODE_DATA_ELIMINATION option enables -fdata-sections, which
62 * generates .data.identifier sections, which need to be pulled in with
63 * .data. We don't want to pull in .data..other sections, which Linux
64 * has defined. Same for text and bss.
66 * RODATA_MAIN is not used because existing code already defines .rodata.x
67 * sections to be brought in with rodata.
69 #ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
70 #define TEXT_MAIN .text .text.[0-9a-zA-Z_]*
71 #define DATA_MAIN .data .data.[0-9a-zA-Z_]*
72 #define SDATA_MAIN .sdata .sdata.[0-9a-zA-Z_]*
73 #define RODATA_MAIN .rodata .rodata.[0-9a-zA-Z_]*
74 #define BSS_MAIN .bss .bss.[0-9a-zA-Z_]*
75 #define SBSS_MAIN .sbss .sbss.[0-9a-zA-Z_]*
77 #define TEXT_MAIN .text
78 #define DATA_MAIN .data
79 #define SDATA_MAIN .sdata
80 #define RODATA_MAIN .rodata
82 #define SBSS_MAIN .sbss
86 * Align to a 32 byte boundary equal to the
87 * alignment gcc 4.5 uses for a struct
89 #define STRUCT_ALIGNMENT 32
90 #define STRUCT_ALIGN() . = ALIGN(STRUCT_ALIGNMENT)
92 /* The actual configuration determine if the init/exit sections
93 * are handled as text/data or they can be discarded (which
94 * often happens at runtime)
96 #ifdef CONFIG_HOTPLUG_CPU
97 #define CPU_KEEP(sec) *(.cpu##sec)
98 #define CPU_DISCARD(sec)
100 #define CPU_KEEP(sec)
101 #define CPU_DISCARD(sec) *(.cpu##sec)
104 #if defined(CONFIG_MEMORY_HOTPLUG)
105 #define MEM_KEEP(sec) *(.mem##sec)
106 #define MEM_DISCARD(sec)
108 #define MEM_KEEP(sec)
109 #define MEM_DISCARD(sec) *(.mem##sec)
112 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
113 #define MCOUNT_REC() . = ALIGN(8); \
114 __start_mcount_loc = .; \
115 KEEP(*(__mcount_loc)) \
116 __stop_mcount_loc = .;
121 #ifdef CONFIG_TRACE_BRANCH_PROFILING
122 #define LIKELY_PROFILE() __start_annotated_branch_profile = .; \
123 KEEP(*(_ftrace_annotated_branch)) \
124 __stop_annotated_branch_profile = .;
126 #define LIKELY_PROFILE()
129 #ifdef CONFIG_PROFILE_ALL_BRANCHES
130 #define BRANCH_PROFILE() __start_branch_profile = .; \
131 KEEP(*(_ftrace_branch)) \
132 __stop_branch_profile = .;
134 #define BRANCH_PROFILE()
137 #ifdef CONFIG_KPROBES
138 #define KPROBE_BLACKLIST() . = ALIGN(8); \
139 __start_kprobe_blacklist = .; \
140 KEEP(*(_kprobe_blacklist)) \
141 __stop_kprobe_blacklist = .;
143 #define KPROBE_BLACKLIST()
146 #ifdef CONFIG_FUNCTION_ERROR_INJECTION
147 #define ERROR_INJECT_WHITELIST() STRUCT_ALIGN(); \
148 __start_error_injection_whitelist = .; \
149 KEEP(*(_error_injection_whitelist)) \
150 __stop_error_injection_whitelist = .;
152 #define ERROR_INJECT_WHITELIST()
155 #ifdef CONFIG_EVENT_TRACING
156 #define FTRACE_EVENTS() . = ALIGN(8); \
157 __start_ftrace_events = .; \
158 KEEP(*(_ftrace_events)) \
159 __stop_ftrace_events = .; \
160 __start_ftrace_eval_maps = .; \
161 KEEP(*(_ftrace_eval_map)) \
162 __stop_ftrace_eval_maps = .;
164 #define FTRACE_EVENTS()
167 #ifdef CONFIG_TRACING
168 #define TRACE_PRINTKS() __start___trace_bprintk_fmt = .; \
169 KEEP(*(__trace_printk_fmt)) /* Trace_printk fmt' pointer */ \
170 __stop___trace_bprintk_fmt = .;
171 #define TRACEPOINT_STR() __start___tracepoint_str = .; \
172 KEEP(*(__tracepoint_str)) /* Trace_printk fmt' pointer */ \
173 __stop___tracepoint_str = .;
175 #define TRACE_PRINTKS()
176 #define TRACEPOINT_STR()
179 #ifdef CONFIG_FTRACE_SYSCALLS
180 #define TRACE_SYSCALLS() . = ALIGN(8); \
181 __start_syscalls_metadata = .; \
182 KEEP(*(__syscalls_metadata)) \
183 __stop_syscalls_metadata = .;
185 #define TRACE_SYSCALLS()
188 #ifdef CONFIG_BPF_EVENTS
189 #define BPF_RAW_TP() STRUCT_ALIGN(); \
190 __start__bpf_raw_tp = .; \
191 KEEP(*(__bpf_raw_tp_map)) \
192 __stop__bpf_raw_tp = .;
197 #ifdef CONFIG_SERIAL_EARLYCON
198 #define EARLYCON_TABLE() . = ALIGN(8); \
199 __earlycon_table = .; \
200 KEEP(*(__earlycon_table)) \
201 __earlycon_table_end = .;
203 #define EARLYCON_TABLE()
206 #define ___OF_TABLE(cfg, name) _OF_TABLE_##cfg(name)
207 #define __OF_TABLE(cfg, name) ___OF_TABLE(cfg, name)
208 #define OF_TABLE(cfg, name) __OF_TABLE(IS_ENABLED(cfg), name)
209 #define _OF_TABLE_0(name)
210 #define _OF_TABLE_1(name) \
212 __##name##_of_table = .; \
213 KEEP(*(__##name##_of_table)) \
214 KEEP(*(__##name##_of_table_end))
216 #define TIMER_OF_TABLES() OF_TABLE(CONFIG_TIMER_OF, timer)
217 #define IRQCHIP_OF_MATCH_TABLE() OF_TABLE(CONFIG_IRQCHIP, irqchip)
218 #define CLK_OF_TABLES() OF_TABLE(CONFIG_COMMON_CLK, clk)
219 #define RESERVEDMEM_OF_TABLES() OF_TABLE(CONFIG_OF_RESERVED_MEM, reservedmem)
220 #define CPU_METHOD_OF_TABLES() OF_TABLE(CONFIG_SMP, cpu_method)
221 #define CPUIDLE_METHOD_OF_TABLES() OF_TABLE(CONFIG_CPU_IDLE, cpuidle_method)
224 #define ACPI_PROBE_TABLE(name) \
226 __##name##_acpi_probe_table = .; \
227 KEEP(*(__##name##_acpi_probe_table)) \
228 __##name##_acpi_probe_table_end = .;
230 #define ACPI_PROBE_TABLE(name)
233 #define KERNEL_DTB() \
236 KEEP(*(.dtb.init.rodata)) \
246 *(.data..shared_aligned) /* percpu related */ \
247 MEM_KEEP(init.data*) \
248 MEM_KEEP(exit.data*) \
255 /* implement dynamic printk debug */ \
257 __start___jump_table = .; \
258 KEEP(*(__jump_table)) \
259 __stop___jump_table = .; \
261 __start___verbose = .; \
263 __stop___verbose = .; \
271 * Data section helpers
273 #define NOSAVE_DATA \
274 . = ALIGN(PAGE_SIZE); \
275 __nosave_begin = .; \
277 . = ALIGN(PAGE_SIZE); \
280 #define PAGE_ALIGNED_DATA(page_align) \
281 . = ALIGN(page_align); \
282 *(.data..page_aligned)
284 #define READ_MOSTLY_DATA(align) \
286 *(.data..read_mostly) \
289 #define CACHELINE_ALIGNED_DATA(align) \
291 *(.data..cacheline_aligned)
293 #define INIT_TASK_DATA(align) \
295 __start_init_task = .; \
296 init_thread_union = .; \
298 KEEP(*(.data..init_task)) \
299 KEEP(*(.data..init_thread_info)) \
300 . = __start_init_task + THREAD_SIZE; \
304 * Allow architectures to handle ro_after_init data on their
305 * own by defining an empty RO_AFTER_INIT_DATA.
307 #ifndef RO_AFTER_INIT_DATA
308 #define RO_AFTER_INIT_DATA \
309 __start_ro_after_init = .; \
310 *(.data..ro_after_init) \
311 __end_ro_after_init = .;
317 #define RO_DATA_SECTION(align) \
318 . = ALIGN((align)); \
319 .rodata : AT(ADDR(.rodata) - LOAD_OFFSET) { \
320 __start_rodata = .; \
321 *(.rodata) *(.rodata.*) \
322 RO_AFTER_INIT_DATA /* Read only after init */ \
323 KEEP(*(__vermagic)) /* Kernel version magic */ \
325 __start___tracepoints_ptrs = .; \
326 KEEP(*(__tracepoints_ptrs)) /* Tracepoints: pointer array */ \
327 __stop___tracepoints_ptrs = .; \
328 *(__tracepoints_strings)/* Tracepoints: strings */ \
331 .rodata1 : AT(ADDR(.rodata1) - LOAD_OFFSET) { \
336 .pci_fixup : AT(ADDR(.pci_fixup) - LOAD_OFFSET) { \
337 __start_pci_fixups_early = .; \
338 KEEP(*(.pci_fixup_early)) \
339 __end_pci_fixups_early = .; \
340 __start_pci_fixups_header = .; \
341 KEEP(*(.pci_fixup_header)) \
342 __end_pci_fixups_header = .; \
343 __start_pci_fixups_final = .; \
344 KEEP(*(.pci_fixup_final)) \
345 __end_pci_fixups_final = .; \
346 __start_pci_fixups_enable = .; \
347 KEEP(*(.pci_fixup_enable)) \
348 __end_pci_fixups_enable = .; \
349 __start_pci_fixups_resume = .; \
350 KEEP(*(.pci_fixup_resume)) \
351 __end_pci_fixups_resume = .; \
352 __start_pci_fixups_resume_early = .; \
353 KEEP(*(.pci_fixup_resume_early)) \
354 __end_pci_fixups_resume_early = .; \
355 __start_pci_fixups_suspend = .; \
356 KEEP(*(.pci_fixup_suspend)) \
357 __end_pci_fixups_suspend = .; \
358 __start_pci_fixups_suspend_late = .; \
359 KEEP(*(.pci_fixup_suspend_late)) \
360 __end_pci_fixups_suspend_late = .; \
363 /* Built-in firmware blobs */ \
364 .builtin_fw : AT(ADDR(.builtin_fw) - LOAD_OFFSET) { \
365 __start_builtin_fw = .; \
366 KEEP(*(.builtin_fw)) \
367 __end_builtin_fw = .; \
372 /* Kernel symbol table: Normal symbols */ \
373 __ksymtab : AT(ADDR(__ksymtab) - LOAD_OFFSET) { \
374 __start___ksymtab = .; \
375 KEEP(*(SORT(___ksymtab+*))) \
376 __stop___ksymtab = .; \
379 /* Kernel symbol table: GPL-only symbols */ \
380 __ksymtab_gpl : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) { \
381 __start___ksymtab_gpl = .; \
382 KEEP(*(SORT(___ksymtab_gpl+*))) \
383 __stop___ksymtab_gpl = .; \
386 /* Kernel symbol table: Normal unused symbols */ \
387 __ksymtab_unused : AT(ADDR(__ksymtab_unused) - LOAD_OFFSET) { \
388 __start___ksymtab_unused = .; \
389 KEEP(*(SORT(___ksymtab_unused+*))) \
390 __stop___ksymtab_unused = .; \
393 /* Kernel symbol table: GPL-only unused symbols */ \
394 __ksymtab_unused_gpl : AT(ADDR(__ksymtab_unused_gpl) - LOAD_OFFSET) { \
395 __start___ksymtab_unused_gpl = .; \
396 KEEP(*(SORT(___ksymtab_unused_gpl+*))) \
397 __stop___ksymtab_unused_gpl = .; \
400 /* Kernel symbol table: GPL-future-only symbols */ \
401 __ksymtab_gpl_future : AT(ADDR(__ksymtab_gpl_future) - LOAD_OFFSET) { \
402 __start___ksymtab_gpl_future = .; \
403 KEEP(*(SORT(___ksymtab_gpl_future+*))) \
404 __stop___ksymtab_gpl_future = .; \
407 /* Kernel symbol table: Normal symbols */ \
408 __kcrctab : AT(ADDR(__kcrctab) - LOAD_OFFSET) { \
409 __start___kcrctab = .; \
410 KEEP(*(SORT(___kcrctab+*))) \
411 __stop___kcrctab = .; \
414 /* Kernel symbol table: GPL-only symbols */ \
415 __kcrctab_gpl : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) { \
416 __start___kcrctab_gpl = .; \
417 KEEP(*(SORT(___kcrctab_gpl+*))) \
418 __stop___kcrctab_gpl = .; \
421 /* Kernel symbol table: Normal unused symbols */ \
422 __kcrctab_unused : AT(ADDR(__kcrctab_unused) - LOAD_OFFSET) { \
423 __start___kcrctab_unused = .; \
424 KEEP(*(SORT(___kcrctab_unused+*))) \
425 __stop___kcrctab_unused = .; \
428 /* Kernel symbol table: GPL-only unused symbols */ \
429 __kcrctab_unused_gpl : AT(ADDR(__kcrctab_unused_gpl) - LOAD_OFFSET) { \
430 __start___kcrctab_unused_gpl = .; \
431 KEEP(*(SORT(___kcrctab_unused_gpl+*))) \
432 __stop___kcrctab_unused_gpl = .; \
435 /* Kernel symbol table: GPL-future-only symbols */ \
436 __kcrctab_gpl_future : AT(ADDR(__kcrctab_gpl_future) - LOAD_OFFSET) { \
437 __start___kcrctab_gpl_future = .; \
438 KEEP(*(SORT(___kcrctab_gpl_future+*))) \
439 __stop___kcrctab_gpl_future = .; \
442 /* Kernel symbol table: strings */ \
443 __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \
444 *(__ksymtab_strings) \
447 /* __*init sections */ \
448 __init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) { \
450 MEM_KEEP(init.rodata) \
451 MEM_KEEP(exit.rodata) \
454 /* Built-in module parameters. */ \
455 __param : AT(ADDR(__param) - LOAD_OFFSET) { \
456 __start___param = .; \
458 __stop___param = .; \
461 /* Built-in module versions. */ \
462 __modver : AT(ADDR(__modver) - LOAD_OFFSET) { \
463 __start___modver = .; \
465 __stop___modver = .; \
466 . = ALIGN((align)); \
471 /* RODATA & RO_DATA provided for backward compatibility.
472 * All archs are supposed to use RO_DATA() */
473 #define RODATA RO_DATA_SECTION(4096)
474 #define RO_DATA(align) RO_DATA_SECTION(align)
476 #define SECURITY_INIT \
477 .security_initcall.init : AT(ADDR(.security_initcall.init) - LOAD_OFFSET) { \
478 __security_initcall_start = .; \
479 KEEP(*(.security_initcall.init)) \
480 __security_initcall_end = .; \
484 * .text section. Map to function alignment to avoid address changes
485 * during second ld run in second ld pass when generating System.map
487 * TEXT_MAIN here will match .text.fixup and .text.unlikely if dead
488 * code elimination is enabled, so these sections should be converted
493 *(.text.hot TEXT_MAIN .text.fixup .text.unlikely) \
496 MEM_KEEP(init.text*) \
497 MEM_KEEP(exit.text*) \
500 /* sched.text is aling to function alignment to secure we have same
501 * address even at second ld pass when generating System.map */
504 __sched_text_start = .; \
506 __sched_text_end = .;
508 /* spinlock.text is aling to function alignment to secure we have same
509 * address even at second ld pass when generating System.map */
512 __lock_text_start = .; \
516 #define CPUIDLE_TEXT \
518 __cpuidle_text_start = .; \
520 __cpuidle_text_end = .;
522 #define KPROBES_TEXT \
524 __kprobes_text_start = .; \
526 __kprobes_text_end = .;
530 __entry_text_start = .; \
532 __entry_text_end = .;
534 #define IRQENTRY_TEXT \
536 __irqentry_text_start = .; \
538 __irqentry_text_end = .;
540 #define SOFTIRQENTRY_TEXT \
542 __softirqentry_text_start = .; \
543 *(.softirqentry.text) \
544 __softirqentry_text_end = .;
546 /* Section used for early init (in .S files) */
547 #define HEAD_TEXT KEEP(*(.head.text))
549 #define HEAD_TEXT_SECTION \
550 .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) { \
557 #define EXCEPTION_TABLE(align) \
559 __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) { \
560 __start___ex_table = .; \
561 KEEP(*(__ex_table)) \
562 __stop___ex_table = .; \
568 #define INIT_TASK_DATA_SECTION(align) \
570 .data..init_task : AT(ADDR(.data..init_task) - LOAD_OFFSET) { \
571 INIT_TASK_DATA(align) \
574 #ifdef CONFIG_CONSTRUCTORS
575 #define KERNEL_CTORS() . = ALIGN(8); \
578 KEEP(*(SORT(.init_array.*))) \
579 KEEP(*(.init_array)) \
582 #define KERNEL_CTORS()
585 /* init and exit section handling */
587 KEEP(*(SORT(___kentry+*))) \
588 *(.init.data init.data.*) \
589 MEM_DISCARD(init.data*) \
592 *(.init.rodata .init.rodata.*) \
596 ERROR_INJECT_WHITELIST() \
597 MEM_DISCARD(init.rodata) \
599 RESERVEDMEM_OF_TABLES() \
601 CPU_METHOD_OF_TABLES() \
602 CPUIDLE_METHOD_OF_TABLES() \
604 IRQCHIP_OF_MATCH_TABLE() \
605 ACPI_PROBE_TABLE(irqchip) \
606 ACPI_PROBE_TABLE(timer) \
610 *(.init.text .init.text.*) \
612 MEM_DISCARD(init.text*)
615 *(.exit.data .exit.data.*) \
618 MEM_DISCARD(exit.data*) \
619 MEM_DISCARD(exit.rodata*)
624 MEM_DISCARD(exit.text)
630 * bss (Block Started by Symbol) - uninitialized data
631 * zeroed during startup
633 #define SBSS(sbss_align) \
634 . = ALIGN(sbss_align); \
635 .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) { \
642 * Allow archectures to redefine BSS_FIRST_SECTIONS to add extra
643 * sections to the front of bss.
645 #ifndef BSS_FIRST_SECTIONS
646 #define BSS_FIRST_SECTIONS
649 #define BSS(bss_align) \
650 . = ALIGN(bss_align); \
651 .bss : AT(ADDR(.bss) - LOAD_OFFSET) { \
653 *(.bss..page_aligned) \
660 * DWARF debug sections.
661 * Symbols in the DWARF debugging sections are relative to
662 * the beginning of the section so we begin them at 0.
664 #define DWARF_DEBUG \
666 .debug 0 : { *(.debug) } \
667 .line 0 : { *(.line) } \
668 /* GNU DWARF 1 extensions */ \
669 .debug_srcinfo 0 : { *(.debug_srcinfo) } \
670 .debug_sfnames 0 : { *(.debug_sfnames) } \
671 /* DWARF 1.1 and DWARF 2 */ \
672 .debug_aranges 0 : { *(.debug_aranges) } \
673 .debug_pubnames 0 : { *(.debug_pubnames) } \
675 .debug_info 0 : { *(.debug_info \
676 .gnu.linkonce.wi.*) } \
677 .debug_abbrev 0 : { *(.debug_abbrev) } \
678 .debug_line 0 : { *(.debug_line) } \
679 .debug_frame 0 : { *(.debug_frame) } \
680 .debug_str 0 : { *(.debug_str) } \
681 .debug_loc 0 : { *(.debug_loc) } \
682 .debug_macinfo 0 : { *(.debug_macinfo) } \
683 .debug_pubtypes 0 : { *(.debug_pubtypes) } \
685 .debug_ranges 0 : { *(.debug_ranges) } \
686 /* SGI/MIPS DWARF 2 extensions */ \
687 .debug_weaknames 0 : { *(.debug_weaknames) } \
688 .debug_funcnames 0 : { *(.debug_funcnames) } \
689 .debug_typenames 0 : { *(.debug_typenames) } \
690 .debug_varnames 0 : { *(.debug_varnames) } \
691 /* GNU DWARF 2 extensions */ \
692 .debug_gnu_pubnames 0 : { *(.debug_gnu_pubnames) } \
693 .debug_gnu_pubtypes 0 : { *(.debug_gnu_pubtypes) } \
695 .debug_types 0 : { *(.debug_types) } \
697 .debug_macro 0 : { *(.debug_macro) } \
698 .debug_addr 0 : { *(.debug_addr) }
700 /* Stabs debugging sections. */
701 #define STABS_DEBUG \
702 .stab 0 : { *(.stab) } \
703 .stabstr 0 : { *(.stabstr) } \
704 .stab.excl 0 : { *(.stab.excl) } \
705 .stab.exclstr 0 : { *(.stab.exclstr) } \
706 .stab.index 0 : { *(.stab.index) } \
707 .stab.indexstr 0 : { *(.stab.indexstr) } \
708 .comment 0 : { *(.comment) }
710 #ifdef CONFIG_GENERIC_BUG
713 __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) { \
714 __start___bug_table = .; \
715 KEEP(*(__bug_table)) \
716 __stop___bug_table = .; \
722 #ifdef CONFIG_UNWINDER_ORC
723 #define ORC_UNWIND_TABLE \
725 .orc_unwind_ip : AT(ADDR(.orc_unwind_ip) - LOAD_OFFSET) { \
726 __start_orc_unwind_ip = .; \
727 KEEP(*(.orc_unwind_ip)) \
728 __stop_orc_unwind_ip = .; \
731 .orc_unwind : AT(ADDR(.orc_unwind) - LOAD_OFFSET) { \
732 __start_orc_unwind = .; \
733 KEEP(*(.orc_unwind)) \
734 __stop_orc_unwind = .; \
737 .orc_lookup : AT(ADDR(.orc_lookup) - LOAD_OFFSET) { \
739 . += (((SIZEOF(.text) + LOOKUP_BLOCK_SIZE - 1) / \
740 LOOKUP_BLOCK_SIZE) + 1) * 4; \
741 orc_lookup_end = .; \
744 #define ORC_UNWIND_TABLE
747 #ifdef CONFIG_PM_TRACE
750 .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) { \
751 __tracedata_start = .; \
752 KEEP(*(.tracedata)) \
753 __tracedata_end = .; \
760 .notes : AT(ADDR(.notes) - LOAD_OFFSET) { \
766 #define INIT_SETUP(initsetup_align) \
767 . = ALIGN(initsetup_align); \
769 KEEP(*(.init.setup)) \
772 #define INIT_CALLS_LEVEL(level) \
773 __initcall##level##_start = .; \
774 KEEP(*(.initcall##level##.init)) \
775 KEEP(*(.initcall##level##s.init)) \
778 __initcall_start = .; \
779 KEEP(*(.initcallearly.init)) \
780 INIT_CALLS_LEVEL(0) \
781 INIT_CALLS_LEVEL(1) \
782 INIT_CALLS_LEVEL(2) \
783 INIT_CALLS_LEVEL(3) \
784 INIT_CALLS_LEVEL(4) \
785 INIT_CALLS_LEVEL(5) \
786 INIT_CALLS_LEVEL(rootfs) \
787 INIT_CALLS_LEVEL(6) \
788 INIT_CALLS_LEVEL(7) \
791 #define CON_INITCALL \
792 __con_initcall_start = .; \
793 KEEP(*(.con_initcall.init)) \
794 __con_initcall_end = .;
796 #define SECURITY_INITCALL \
797 __security_initcall_start = .; \
798 KEEP(*(.security_initcall.init)) \
799 __security_initcall_end = .;
801 #ifdef CONFIG_BLK_DEV_INITRD
802 #define INIT_RAM_FS \
804 __initramfs_start = .; \
805 KEEP(*(.init.ramfs)) \
807 KEEP(*(.init.ramfs.info))
813 * Memory encryption operates on a page basis. Since we need to clear
814 * the memory encryption mask for this section, it needs to be aligned
815 * on a page boundary and be a page-size multiple in length.
817 * Note: We use a separate section so that only this section gets
818 * decrypted to avoid exposing more than we wish.
820 #ifdef CONFIG_AMD_MEM_ENCRYPT
821 #define PERCPU_DECRYPTED_SECTION \
822 . = ALIGN(PAGE_SIZE); \
823 *(.data..percpu..decrypted) \
824 . = ALIGN(PAGE_SIZE);
826 #define PERCPU_DECRYPTED_SECTION
831 * Default discarded sections.
833 * Some archs want to discard exit text/data at runtime rather than
834 * link time due to cross-section references such as alt instructions,
835 * bug table, eh_frame, etc. DISCARDS must be the last of output
836 * section definitions so that such archs put those in earlier section
849 * PERCPU_INPUT - the percpu input sections
850 * @cacheline: cacheline size
852 * The core percpu section names and core symbols which do not rely
853 * directly upon load addresses.
855 * @cacheline is used to align subsections to avoid false cacheline
856 * sharing between subsections for different purposes.
858 #define PERCPU_INPUT(cacheline) \
859 __per_cpu_start = .; \
860 *(.data..percpu..first) \
861 . = ALIGN(PAGE_SIZE); \
862 *(.data..percpu..page_aligned) \
863 . = ALIGN(cacheline); \
864 *(.data..percpu..read_mostly) \
865 . = ALIGN(cacheline); \
867 *(.data..percpu..shared_aligned) \
868 PERCPU_DECRYPTED_SECTION \
872 * PERCPU_VADDR - define output section for percpu area
873 * @cacheline: cacheline size
874 * @vaddr: explicit base address (optional)
875 * @phdr: destination PHDR (optional)
877 * Macro which expands to output section for percpu area.
879 * @cacheline is used to align subsections to avoid false cacheline
880 * sharing between subsections for different purposes.
882 * If @vaddr is not blank, it specifies explicit base address and all
883 * percpu symbols will be offset from the given address. If blank,
884 * @vaddr always equals @laddr + LOAD_OFFSET.
886 * @phdr defines the output PHDR to use if not blank. Be warned that
887 * output PHDR is sticky. If @phdr is specified, the next output
888 * section in the linker script will go there too. @phdr should have
891 * Note that this macros defines __per_cpu_load as an absolute symbol.
892 * If there is no need to put the percpu section at a predetermined
893 * address, use PERCPU_SECTION.
895 #define PERCPU_VADDR(cacheline, vaddr, phdr) \
896 __per_cpu_load = .; \
897 .data..percpu vaddr : AT(__per_cpu_load - LOAD_OFFSET) { \
898 PERCPU_INPUT(cacheline) \
900 . = __per_cpu_load + SIZEOF(.data..percpu);
903 * PERCPU_SECTION - define output section for percpu area, simple version
904 * @cacheline: cacheline size
906 * Align to PAGE_SIZE and outputs output section for percpu area. This
907 * macro doesn't manipulate @vaddr or @phdr and __per_cpu_load and
908 * __per_cpu_start will be identical.
910 * This macro is equivalent to ALIGN(PAGE_SIZE); PERCPU_VADDR(@cacheline,,)
911 * except that __per_cpu_load is defined as a relative symbol against
912 * .data..percpu which is required for relocatable x86_32 configuration.
914 #define PERCPU_SECTION(cacheline) \
915 . = ALIGN(PAGE_SIZE); \
916 .data..percpu : AT(ADDR(.data..percpu) - LOAD_OFFSET) { \
917 __per_cpu_load = .; \
918 PERCPU_INPUT(cacheline) \
923 * Definition of the high level *_SECTION macros
924 * They will fit only a subset of the architectures
930 * All sections are combined in a single .data section.
931 * The sections following CONSTRUCTORS are arranged so their
932 * typical alignment matches.
933 * A cacheline is typical/always less than a PAGE_SIZE so
934 * the sections that has this restriction (or similar)
935 * is located before the ones requiring PAGE_SIZE alignment.
936 * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which
937 * matches the requirement of PAGE_ALIGNED_DATA.
939 * use 0 as page_align if page_aligned data is not used */
940 #define RW_DATA_SECTION(cacheline, pagealigned, inittask) \
941 . = ALIGN(PAGE_SIZE); \
942 .data : AT(ADDR(.data) - LOAD_OFFSET) { \
943 INIT_TASK_DATA(inittask) \
945 PAGE_ALIGNED_DATA(pagealigned) \
946 CACHELINE_ALIGNED_DATA(cacheline) \
947 READ_MOSTLY_DATA(cacheline) \
953 #define INIT_TEXT_SECTION(inittext_align) \
954 . = ALIGN(inittext_align); \
955 .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) { \
961 #define INIT_DATA_SECTION(initsetup_align) \
962 .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) { \
964 INIT_SETUP(initsetup_align) \
971 #define BSS_SECTION(sbss_align, bss_align, stop_align) \
972 . = ALIGN(sbss_align); \
976 . = ALIGN(stop_align); \