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_]* .data..LPBX*
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 #ifdef CC_USING_PATCHABLE_FUNCTION_ENTRY
114 #define MCOUNT_REC() . = ALIGN(8); \
115 __start_mcount_loc = .; \
116 KEEP(*(__patchable_function_entries)) \
117 __stop_mcount_loc = .;
119 #define MCOUNT_REC() . = ALIGN(8); \
120 __start_mcount_loc = .; \
121 KEEP(*(__mcount_loc)) \
122 __stop_mcount_loc = .;
128 #ifdef CONFIG_TRACE_BRANCH_PROFILING
129 #define LIKELY_PROFILE() __start_annotated_branch_profile = .; \
130 KEEP(*(_ftrace_annotated_branch)) \
131 __stop_annotated_branch_profile = .;
133 #define LIKELY_PROFILE()
136 #ifdef CONFIG_PROFILE_ALL_BRANCHES
137 #define BRANCH_PROFILE() __start_branch_profile = .; \
138 KEEP(*(_ftrace_branch)) \
139 __stop_branch_profile = .;
141 #define BRANCH_PROFILE()
144 #ifdef CONFIG_KPROBES
145 #define KPROBE_BLACKLIST() . = ALIGN(8); \
146 __start_kprobe_blacklist = .; \
147 KEEP(*(_kprobe_blacklist)) \
148 __stop_kprobe_blacklist = .;
150 #define KPROBE_BLACKLIST()
153 #ifdef CONFIG_FUNCTION_ERROR_INJECTION
154 #define ERROR_INJECT_WHITELIST() STRUCT_ALIGN(); \
155 __start_error_injection_whitelist = .; \
156 KEEP(*(_error_injection_whitelist)) \
157 __stop_error_injection_whitelist = .;
159 #define ERROR_INJECT_WHITELIST()
162 #ifdef CONFIG_EVENT_TRACING
163 #define FTRACE_EVENTS() . = ALIGN(8); \
164 __start_ftrace_events = .; \
165 KEEP(*(_ftrace_events)) \
166 __stop_ftrace_events = .; \
167 __start_ftrace_eval_maps = .; \
168 KEEP(*(_ftrace_eval_map)) \
169 __stop_ftrace_eval_maps = .;
171 #define FTRACE_EVENTS()
174 #ifdef CONFIG_TRACING
175 #define TRACE_PRINTKS() __start___trace_bprintk_fmt = .; \
176 KEEP(*(__trace_printk_fmt)) /* Trace_printk fmt' pointer */ \
177 __stop___trace_bprintk_fmt = .;
178 #define TRACEPOINT_STR() __start___tracepoint_str = .; \
179 KEEP(*(__tracepoint_str)) /* Trace_printk fmt' pointer */ \
180 __stop___tracepoint_str = .;
182 #define TRACE_PRINTKS()
183 #define TRACEPOINT_STR()
186 #ifdef CONFIG_FTRACE_SYSCALLS
187 #define TRACE_SYSCALLS() . = ALIGN(8); \
188 __start_syscalls_metadata = .; \
189 KEEP(*(__syscalls_metadata)) \
190 __stop_syscalls_metadata = .;
192 #define TRACE_SYSCALLS()
195 #ifdef CONFIG_BPF_EVENTS
196 #define BPF_RAW_TP() STRUCT_ALIGN(); \
197 __start__bpf_raw_tp = .; \
198 KEEP(*(__bpf_raw_tp_map)) \
199 __stop__bpf_raw_tp = .;
204 #ifdef CONFIG_SERIAL_EARLYCON
205 #define EARLYCON_TABLE() . = ALIGN(8); \
206 __earlycon_table = .; \
207 KEEP(*(__earlycon_table)) \
208 __earlycon_table_end = .;
210 #define EARLYCON_TABLE()
213 #ifdef CONFIG_SECURITY
214 #define LSM_TABLE() . = ALIGN(8); \
215 __start_lsm_info = .; \
216 KEEP(*(.lsm_info.init)) \
222 #define ___OF_TABLE(cfg, name) _OF_TABLE_##cfg(name)
223 #define __OF_TABLE(cfg, name) ___OF_TABLE(cfg, name)
224 #define OF_TABLE(cfg, name) __OF_TABLE(IS_ENABLED(cfg), name)
225 #define _OF_TABLE_0(name)
226 #define _OF_TABLE_1(name) \
228 __##name##_of_table = .; \
229 KEEP(*(__##name##_of_table)) \
230 KEEP(*(__##name##_of_table_end))
232 #define TIMER_OF_TABLES() OF_TABLE(CONFIG_TIMER_OF, timer)
233 #define IRQCHIP_OF_MATCH_TABLE() OF_TABLE(CONFIG_IRQCHIP, irqchip)
234 #define CLK_OF_TABLES() OF_TABLE(CONFIG_COMMON_CLK, clk)
235 #define RESERVEDMEM_OF_TABLES() OF_TABLE(CONFIG_OF_RESERVED_MEM, reservedmem)
236 #define CPU_METHOD_OF_TABLES() OF_TABLE(CONFIG_SMP, cpu_method)
237 #define CPUIDLE_METHOD_OF_TABLES() OF_TABLE(CONFIG_CPU_IDLE, cpuidle_method)
240 #define ACPI_PROBE_TABLE(name) \
242 __##name##_acpi_probe_table = .; \
243 KEEP(*(__##name##_acpi_probe_table)) \
244 __##name##_acpi_probe_table_end = .;
246 #define ACPI_PROBE_TABLE(name)
249 #define KERNEL_DTB() \
252 KEEP(*(.dtb.init.rodata)) \
262 *(.data..shared_aligned) /* percpu related */ \
263 MEM_KEEP(init.data*) \
264 MEM_KEEP(exit.data*) \
271 /* implement dynamic printk debug */ \
273 __start___verbose = .; \
275 __stop___verbose = .; \
283 * Data section helpers
285 #define NOSAVE_DATA \
286 . = ALIGN(PAGE_SIZE); \
287 __nosave_begin = .; \
289 . = ALIGN(PAGE_SIZE); \
292 #define PAGE_ALIGNED_DATA(page_align) \
293 . = ALIGN(page_align); \
294 *(.data..page_aligned)
296 #define READ_MOSTLY_DATA(align) \
298 *(.data..read_mostly) \
301 #define CACHELINE_ALIGNED_DATA(align) \
303 *(.data..cacheline_aligned)
305 #define INIT_TASK_DATA(align) \
307 __start_init_task = .; \
308 init_thread_union = .; \
310 KEEP(*(.data..init_task)) \
311 KEEP(*(.data..init_thread_info)) \
312 . = __start_init_task + THREAD_SIZE; \
315 #define JUMP_TABLE_DATA \
317 __start___jump_table = .; \
318 KEEP(*(__jump_table)) \
319 __stop___jump_table = .;
322 * Allow architectures to handle ro_after_init data on their
323 * own by defining an empty RO_AFTER_INIT_DATA.
325 #ifndef RO_AFTER_INIT_DATA
326 #define RO_AFTER_INIT_DATA \
327 __start_ro_after_init = .; \
328 *(.data..ro_after_init) \
330 __end_ro_after_init = .;
336 #define RO_DATA_SECTION(align) \
337 . = ALIGN((align)); \
338 .rodata : AT(ADDR(.rodata) - LOAD_OFFSET) { \
339 __start_rodata = .; \
340 *(.rodata) *(.rodata.*) \
341 RO_AFTER_INIT_DATA /* Read only after init */ \
343 __start___tracepoints_ptrs = .; \
344 KEEP(*(__tracepoints_ptrs)) /* Tracepoints: pointer array */ \
345 __stop___tracepoints_ptrs = .; \
346 *(__tracepoints_strings)/* Tracepoints: strings */ \
349 .rodata1 : AT(ADDR(.rodata1) - LOAD_OFFSET) { \
354 .pci_fixup : AT(ADDR(.pci_fixup) - LOAD_OFFSET) { \
355 __start_pci_fixups_early = .; \
356 KEEP(*(.pci_fixup_early)) \
357 __end_pci_fixups_early = .; \
358 __start_pci_fixups_header = .; \
359 KEEP(*(.pci_fixup_header)) \
360 __end_pci_fixups_header = .; \
361 __start_pci_fixups_final = .; \
362 KEEP(*(.pci_fixup_final)) \
363 __end_pci_fixups_final = .; \
364 __start_pci_fixups_enable = .; \
365 KEEP(*(.pci_fixup_enable)) \
366 __end_pci_fixups_enable = .; \
367 __start_pci_fixups_resume = .; \
368 KEEP(*(.pci_fixup_resume)) \
369 __end_pci_fixups_resume = .; \
370 __start_pci_fixups_resume_early = .; \
371 KEEP(*(.pci_fixup_resume_early)) \
372 __end_pci_fixups_resume_early = .; \
373 __start_pci_fixups_suspend = .; \
374 KEEP(*(.pci_fixup_suspend)) \
375 __end_pci_fixups_suspend = .; \
376 __start_pci_fixups_suspend_late = .; \
377 KEEP(*(.pci_fixup_suspend_late)) \
378 __end_pci_fixups_suspend_late = .; \
381 /* Built-in firmware blobs */ \
382 .builtin_fw : AT(ADDR(.builtin_fw) - LOAD_OFFSET) { \
383 __start_builtin_fw = .; \
384 KEEP(*(.builtin_fw)) \
385 __end_builtin_fw = .; \
390 /* Kernel symbol table: Normal symbols */ \
391 __ksymtab : AT(ADDR(__ksymtab) - LOAD_OFFSET) { \
392 __start___ksymtab = .; \
393 KEEP(*(SORT(___ksymtab+*))) \
394 __stop___ksymtab = .; \
397 /* Kernel symbol table: GPL-only symbols */ \
398 __ksymtab_gpl : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) { \
399 __start___ksymtab_gpl = .; \
400 KEEP(*(SORT(___ksymtab_gpl+*))) \
401 __stop___ksymtab_gpl = .; \
404 /* Kernel symbol table: Normal unused symbols */ \
405 __ksymtab_unused : AT(ADDR(__ksymtab_unused) - LOAD_OFFSET) { \
406 __start___ksymtab_unused = .; \
407 KEEP(*(SORT(___ksymtab_unused+*))) \
408 __stop___ksymtab_unused = .; \
411 /* Kernel symbol table: GPL-only unused symbols */ \
412 __ksymtab_unused_gpl : AT(ADDR(__ksymtab_unused_gpl) - LOAD_OFFSET) { \
413 __start___ksymtab_unused_gpl = .; \
414 KEEP(*(SORT(___ksymtab_unused_gpl+*))) \
415 __stop___ksymtab_unused_gpl = .; \
418 /* Kernel symbol table: GPL-future-only symbols */ \
419 __ksymtab_gpl_future : AT(ADDR(__ksymtab_gpl_future) - LOAD_OFFSET) { \
420 __start___ksymtab_gpl_future = .; \
421 KEEP(*(SORT(___ksymtab_gpl_future+*))) \
422 __stop___ksymtab_gpl_future = .; \
425 /* Kernel symbol table: Normal symbols */ \
426 __kcrctab : AT(ADDR(__kcrctab) - LOAD_OFFSET) { \
427 __start___kcrctab = .; \
428 KEEP(*(SORT(___kcrctab+*))) \
429 __stop___kcrctab = .; \
432 /* Kernel symbol table: GPL-only symbols */ \
433 __kcrctab_gpl : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) { \
434 __start___kcrctab_gpl = .; \
435 KEEP(*(SORT(___kcrctab_gpl+*))) \
436 __stop___kcrctab_gpl = .; \
439 /* Kernel symbol table: Normal unused symbols */ \
440 __kcrctab_unused : AT(ADDR(__kcrctab_unused) - LOAD_OFFSET) { \
441 __start___kcrctab_unused = .; \
442 KEEP(*(SORT(___kcrctab_unused+*))) \
443 __stop___kcrctab_unused = .; \
446 /* Kernel symbol table: GPL-only unused symbols */ \
447 __kcrctab_unused_gpl : AT(ADDR(__kcrctab_unused_gpl) - LOAD_OFFSET) { \
448 __start___kcrctab_unused_gpl = .; \
449 KEEP(*(SORT(___kcrctab_unused_gpl+*))) \
450 __stop___kcrctab_unused_gpl = .; \
453 /* Kernel symbol table: GPL-future-only symbols */ \
454 __kcrctab_gpl_future : AT(ADDR(__kcrctab_gpl_future) - LOAD_OFFSET) { \
455 __start___kcrctab_gpl_future = .; \
456 KEEP(*(SORT(___kcrctab_gpl_future+*))) \
457 __stop___kcrctab_gpl_future = .; \
460 /* Kernel symbol table: strings */ \
461 __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \
462 *(__ksymtab_strings) \
465 /* __*init sections */ \
466 __init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) { \
468 MEM_KEEP(init.rodata) \
469 MEM_KEEP(exit.rodata) \
472 /* Built-in module parameters. */ \
473 __param : AT(ADDR(__param) - LOAD_OFFSET) { \
474 __start___param = .; \
476 __stop___param = .; \
479 /* Built-in module versions. */ \
480 __modver : AT(ADDR(__modver) - LOAD_OFFSET) { \
481 __start___modver = .; \
483 __stop___modver = .; \
484 . = ALIGN((align)); \
489 /* RODATA & RO_DATA provided for backward compatibility.
490 * All archs are supposed to use RO_DATA() */
491 #define RODATA RO_DATA_SECTION(4096)
492 #define RO_DATA(align) RO_DATA_SECTION(align)
495 * .text section. Map to function alignment to avoid address changes
496 * during second ld run in second ld pass when generating System.map
498 * TEXT_MAIN here will match .text.fixup and .text.unlikely if dead
499 * code elimination is enabled, so these sections should be converted
504 *(.text.hot TEXT_MAIN .text.fixup .text.unlikely) \
507 MEM_KEEP(init.text*) \
508 MEM_KEEP(exit.text*) \
511 /* sched.text is aling to function alignment to secure we have same
512 * address even at second ld pass when generating System.map */
515 __sched_text_start = .; \
517 __sched_text_end = .;
519 /* spinlock.text is aling to function alignment to secure we have same
520 * address even at second ld pass when generating System.map */
523 __lock_text_start = .; \
527 #define CPUIDLE_TEXT \
529 __cpuidle_text_start = .; \
531 __cpuidle_text_end = .;
533 #define KPROBES_TEXT \
535 __kprobes_text_start = .; \
537 __kprobes_text_end = .;
541 __entry_text_start = .; \
543 __entry_text_end = .;
545 #define IRQENTRY_TEXT \
547 __irqentry_text_start = .; \
549 __irqentry_text_end = .;
551 #define SOFTIRQENTRY_TEXT \
553 __softirqentry_text_start = .; \
554 *(.softirqentry.text) \
555 __softirqentry_text_end = .;
557 /* Section used for early init (in .S files) */
558 #define HEAD_TEXT KEEP(*(.head.text))
560 #define HEAD_TEXT_SECTION \
561 .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) { \
568 #define EXCEPTION_TABLE(align) \
570 __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) { \
571 __start___ex_table = .; \
572 KEEP(*(__ex_table)) \
573 __stop___ex_table = .; \
579 #define INIT_TASK_DATA_SECTION(align) \
581 .data..init_task : AT(ADDR(.data..init_task) - LOAD_OFFSET) { \
582 INIT_TASK_DATA(align) \
585 #ifdef CONFIG_CONSTRUCTORS
586 #define KERNEL_CTORS() . = ALIGN(8); \
589 KEEP(*(SORT(.init_array.*))) \
590 KEEP(*(.init_array)) \
593 #define KERNEL_CTORS()
596 /* init and exit section handling */
598 KEEP(*(SORT(___kentry+*))) \
599 *(.init.data init.data.*) \
600 MEM_DISCARD(init.data*) \
603 *(.init.rodata .init.rodata.*) \
607 ERROR_INJECT_WHITELIST() \
608 MEM_DISCARD(init.rodata) \
610 RESERVEDMEM_OF_TABLES() \
612 CPU_METHOD_OF_TABLES() \
613 CPUIDLE_METHOD_OF_TABLES() \
615 IRQCHIP_OF_MATCH_TABLE() \
616 ACPI_PROBE_TABLE(irqchip) \
617 ACPI_PROBE_TABLE(timer) \
622 *(.init.text .init.text.*) \
624 MEM_DISCARD(init.text*)
627 *(.exit.data .exit.data.*) \
628 *(.fini_array .fini_array.*) \
630 MEM_DISCARD(exit.data*) \
631 MEM_DISCARD(exit.rodata*)
636 MEM_DISCARD(exit.text)
642 * bss (Block Started by Symbol) - uninitialized data
643 * zeroed during startup
645 #define SBSS(sbss_align) \
646 . = ALIGN(sbss_align); \
647 .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) { \
654 * Allow archectures to redefine BSS_FIRST_SECTIONS to add extra
655 * sections to the front of bss.
657 #ifndef BSS_FIRST_SECTIONS
658 #define BSS_FIRST_SECTIONS
661 #define BSS(bss_align) \
662 . = ALIGN(bss_align); \
663 .bss : AT(ADDR(.bss) - LOAD_OFFSET) { \
665 *(.bss..page_aligned) \
672 * DWARF debug sections.
673 * Symbols in the DWARF debugging sections are relative to
674 * the beginning of the section so we begin them at 0.
676 #define DWARF_DEBUG \
678 .debug 0 : { *(.debug) } \
679 .line 0 : { *(.line) } \
680 /* GNU DWARF 1 extensions */ \
681 .debug_srcinfo 0 : { *(.debug_srcinfo) } \
682 .debug_sfnames 0 : { *(.debug_sfnames) } \
683 /* DWARF 1.1 and DWARF 2 */ \
684 .debug_aranges 0 : { *(.debug_aranges) } \
685 .debug_pubnames 0 : { *(.debug_pubnames) } \
687 .debug_info 0 : { *(.debug_info \
688 .gnu.linkonce.wi.*) } \
689 .debug_abbrev 0 : { *(.debug_abbrev) } \
690 .debug_line 0 : { *(.debug_line) } \
691 .debug_frame 0 : { *(.debug_frame) } \
692 .debug_str 0 : { *(.debug_str) } \
693 .debug_loc 0 : { *(.debug_loc) } \
694 .debug_macinfo 0 : { *(.debug_macinfo) } \
695 .debug_pubtypes 0 : { *(.debug_pubtypes) } \
697 .debug_ranges 0 : { *(.debug_ranges) } \
698 /* SGI/MIPS DWARF 2 extensions */ \
699 .debug_weaknames 0 : { *(.debug_weaknames) } \
700 .debug_funcnames 0 : { *(.debug_funcnames) } \
701 .debug_typenames 0 : { *(.debug_typenames) } \
702 .debug_varnames 0 : { *(.debug_varnames) } \
703 /* GNU DWARF 2 extensions */ \
704 .debug_gnu_pubnames 0 : { *(.debug_gnu_pubnames) } \
705 .debug_gnu_pubtypes 0 : { *(.debug_gnu_pubtypes) } \
707 .debug_types 0 : { *(.debug_types) } \
709 .debug_macro 0 : { *(.debug_macro) } \
710 .debug_addr 0 : { *(.debug_addr) }
712 /* Stabs debugging sections. */
713 #define STABS_DEBUG \
714 .stab 0 : { *(.stab) } \
715 .stabstr 0 : { *(.stabstr) } \
716 .stab.excl 0 : { *(.stab.excl) } \
717 .stab.exclstr 0 : { *(.stab.exclstr) } \
718 .stab.index 0 : { *(.stab.index) } \
719 .stab.indexstr 0 : { *(.stab.indexstr) } \
720 .comment 0 : { *(.comment) }
722 #ifdef CONFIG_GENERIC_BUG
725 __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) { \
726 __start___bug_table = .; \
727 KEEP(*(__bug_table)) \
728 __stop___bug_table = .; \
734 #ifdef CONFIG_UNWINDER_ORC
735 #define ORC_UNWIND_TABLE \
737 .orc_unwind_ip : AT(ADDR(.orc_unwind_ip) - LOAD_OFFSET) { \
738 __start_orc_unwind_ip = .; \
739 KEEP(*(.orc_unwind_ip)) \
740 __stop_orc_unwind_ip = .; \
743 .orc_unwind : AT(ADDR(.orc_unwind) - LOAD_OFFSET) { \
744 __start_orc_unwind = .; \
745 KEEP(*(.orc_unwind)) \
746 __stop_orc_unwind = .; \
749 .orc_lookup : AT(ADDR(.orc_lookup) - LOAD_OFFSET) { \
751 . += (((SIZEOF(.text) + LOOKUP_BLOCK_SIZE - 1) / \
752 LOOKUP_BLOCK_SIZE) + 1) * 4; \
753 orc_lookup_end = .; \
756 #define ORC_UNWIND_TABLE
759 #ifdef CONFIG_PM_TRACE
762 .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) { \
763 __tracedata_start = .; \
764 KEEP(*(.tracedata)) \
765 __tracedata_end = .; \
772 .notes : AT(ADDR(.notes) - LOAD_OFFSET) { \
778 #define INIT_SETUP(initsetup_align) \
779 . = ALIGN(initsetup_align); \
781 KEEP(*(.init.setup)) \
784 #define INIT_CALLS_LEVEL(level) \
785 __initcall##level##_start = .; \
786 KEEP(*(.initcall##level##.init)) \
787 KEEP(*(.initcall##level##s.init)) \
790 __initcall_start = .; \
791 KEEP(*(.initcallearly.init)) \
792 INIT_CALLS_LEVEL(0) \
793 INIT_CALLS_LEVEL(1) \
794 INIT_CALLS_LEVEL(2) \
795 INIT_CALLS_LEVEL(3) \
796 INIT_CALLS_LEVEL(4) \
797 INIT_CALLS_LEVEL(5) \
798 INIT_CALLS_LEVEL(rootfs) \
799 INIT_CALLS_LEVEL(6) \
800 INIT_CALLS_LEVEL(7) \
803 #define CON_INITCALL \
804 __con_initcall_start = .; \
805 KEEP(*(.con_initcall.init)) \
806 __con_initcall_end = .;
808 #ifdef CONFIG_BLK_DEV_INITRD
809 #define INIT_RAM_FS \
811 __initramfs_start = .; \
812 KEEP(*(.init.ramfs)) \
814 KEEP(*(.init.ramfs.info))
820 * Memory encryption operates on a page basis. Since we need to clear
821 * the memory encryption mask for this section, it needs to be aligned
822 * on a page boundary and be a page-size multiple in length.
824 * Note: We use a separate section so that only this section gets
825 * decrypted to avoid exposing more than we wish.
827 #ifdef CONFIG_AMD_MEM_ENCRYPT
828 #define PERCPU_DECRYPTED_SECTION \
829 . = ALIGN(PAGE_SIZE); \
830 *(.data..percpu..decrypted) \
831 . = ALIGN(PAGE_SIZE);
833 #define PERCPU_DECRYPTED_SECTION
838 * Default discarded sections.
840 * Some archs want to discard exit text/data at runtime rather than
841 * link time due to cross-section references such as alt instructions,
842 * bug table, eh_frame, etc. DISCARDS must be the last of output
843 * section definitions so that such archs put those in earlier section
857 * PERCPU_INPUT - the percpu input sections
858 * @cacheline: cacheline size
860 * The core percpu section names and core symbols which do not rely
861 * directly upon load addresses.
863 * @cacheline is used to align subsections to avoid false cacheline
864 * sharing between subsections for different purposes.
866 #define PERCPU_INPUT(cacheline) \
867 __per_cpu_start = .; \
868 *(.data..percpu..first) \
869 . = ALIGN(PAGE_SIZE); \
870 *(.data..percpu..page_aligned) \
871 . = ALIGN(cacheline); \
872 *(.data..percpu..read_mostly) \
873 . = ALIGN(cacheline); \
875 *(.data..percpu..shared_aligned) \
876 PERCPU_DECRYPTED_SECTION \
880 * PERCPU_VADDR - define output section for percpu area
881 * @cacheline: cacheline size
882 * @vaddr: explicit base address (optional)
883 * @phdr: destination PHDR (optional)
885 * Macro which expands to output section for percpu area.
887 * @cacheline is used to align subsections to avoid false cacheline
888 * sharing between subsections for different purposes.
890 * If @vaddr is not blank, it specifies explicit base address and all
891 * percpu symbols will be offset from the given address. If blank,
892 * @vaddr always equals @laddr + LOAD_OFFSET.
894 * @phdr defines the output PHDR to use if not blank. Be warned that
895 * output PHDR is sticky. If @phdr is specified, the next output
896 * section in the linker script will go there too. @phdr should have
899 * Note that this macros defines __per_cpu_load as an absolute symbol.
900 * If there is no need to put the percpu section at a predetermined
901 * address, use PERCPU_SECTION.
903 #define PERCPU_VADDR(cacheline, vaddr, phdr) \
904 __per_cpu_load = .; \
905 .data..percpu vaddr : AT(__per_cpu_load - LOAD_OFFSET) { \
906 PERCPU_INPUT(cacheline) \
908 . = __per_cpu_load + SIZEOF(.data..percpu);
911 * PERCPU_SECTION - define output section for percpu area, simple version
912 * @cacheline: cacheline size
914 * Align to PAGE_SIZE and outputs output section for percpu area. This
915 * macro doesn't manipulate @vaddr or @phdr and __per_cpu_load and
916 * __per_cpu_start will be identical.
918 * This macro is equivalent to ALIGN(PAGE_SIZE); PERCPU_VADDR(@cacheline,,)
919 * except that __per_cpu_load is defined as a relative symbol against
920 * .data..percpu which is required for relocatable x86_32 configuration.
922 #define PERCPU_SECTION(cacheline) \
923 . = ALIGN(PAGE_SIZE); \
924 .data..percpu : AT(ADDR(.data..percpu) - LOAD_OFFSET) { \
925 __per_cpu_load = .; \
926 PERCPU_INPUT(cacheline) \
931 * Definition of the high level *_SECTION macros
932 * They will fit only a subset of the architectures
938 * All sections are combined in a single .data section.
939 * The sections following CONSTRUCTORS are arranged so their
940 * typical alignment matches.
941 * A cacheline is typical/always less than a PAGE_SIZE so
942 * the sections that has this restriction (or similar)
943 * is located before the ones requiring PAGE_SIZE alignment.
944 * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which
945 * matches the requirement of PAGE_ALIGNED_DATA.
947 * use 0 as page_align if page_aligned data is not used */
948 #define RW_DATA_SECTION(cacheline, pagealigned, inittask) \
949 . = ALIGN(PAGE_SIZE); \
950 .data : AT(ADDR(.data) - LOAD_OFFSET) { \
951 INIT_TASK_DATA(inittask) \
953 PAGE_ALIGNED_DATA(pagealigned) \
954 CACHELINE_ALIGNED_DATA(cacheline) \
955 READ_MOSTLY_DATA(cacheline) \
961 #define INIT_TEXT_SECTION(inittext_align) \
962 . = ALIGN(inittext_align); \
963 .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) { \
969 #define INIT_DATA_SECTION(initsetup_align) \
970 .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) { \
972 INIT_SETUP(initsetup_align) \
978 #define BSS_SECTION(sbss_align, bss_align, stop_align) \
979 . = ALIGN(sbss_align); \
983 . = ALIGN(stop_align); \