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 * [_stext, _etext] is the text section
44 * [_sdata, _edata] is the data section
46 * Some of the included output section have their own set of constants.
47 * Examples are: [__initramfs_start, __initramfs_end] for initramfs and
48 * [__nosave_begin, __nosave_end] for the nosave data
55 #include <linux/export.h>
57 /* Align . to a 8 byte boundary equals to maximum function alignment. */
58 #define ALIGN_FUNCTION() . = ALIGN(8)
61 * Align to a 32 byte boundary equal to the
62 * alignment gcc 4.5 uses for a struct
64 #define STRUCT_ALIGNMENT 32
65 #define STRUCT_ALIGN() . = ALIGN(STRUCT_ALIGNMENT)
67 /* The actual configuration determine if the init/exit sections
68 * are handled as text/data or they can be discarded (which
69 * often happens at runtime)
71 #ifdef CONFIG_HOTPLUG_CPU
72 #define CPU_KEEP(sec) *(.cpu##sec)
73 #define CPU_DISCARD(sec)
76 #define CPU_DISCARD(sec) *(.cpu##sec)
79 #if defined(CONFIG_MEMORY_HOTPLUG)
80 #define MEM_KEEP(sec) *(.mem##sec)
81 #define MEM_DISCARD(sec)
84 #define MEM_DISCARD(sec) *(.mem##sec)
87 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
88 #define MCOUNT_REC() . = ALIGN(8); \
89 VMLINUX_SYMBOL(__start_mcount_loc) = .; \
91 VMLINUX_SYMBOL(__stop_mcount_loc) = .;
96 #ifdef CONFIG_TRACE_BRANCH_PROFILING
97 #define LIKELY_PROFILE() VMLINUX_SYMBOL(__start_annotated_branch_profile) = .; \
98 *(_ftrace_annotated_branch) \
99 VMLINUX_SYMBOL(__stop_annotated_branch_profile) = .;
101 #define LIKELY_PROFILE()
104 #ifdef CONFIG_PROFILE_ALL_BRANCHES
105 #define BRANCH_PROFILE() VMLINUX_SYMBOL(__start_branch_profile) = .; \
107 VMLINUX_SYMBOL(__stop_branch_profile) = .;
109 #define BRANCH_PROFILE()
112 #ifdef CONFIG_EVENT_TRACING
113 #define FTRACE_EVENTS() . = ALIGN(8); \
114 VMLINUX_SYMBOL(__start_ftrace_events) = .; \
116 VMLINUX_SYMBOL(__stop_ftrace_events) = .;
118 #define FTRACE_EVENTS()
121 #ifdef CONFIG_TRACING
122 #define TRACE_PRINTKS() VMLINUX_SYMBOL(__start___trace_bprintk_fmt) = .; \
123 *(__trace_printk_fmt) /* Trace_printk fmt' pointer */ \
124 VMLINUX_SYMBOL(__stop___trace_bprintk_fmt) = .;
125 #define TRACEPOINT_STR() VMLINUX_SYMBOL(__start___tracepoint_str) = .; \
126 *(__tracepoint_str) /* Trace_printk fmt' pointer */ \
127 VMLINUX_SYMBOL(__stop___tracepoint_str) = .;
129 #define TRACE_PRINTKS()
130 #define TRACEPOINT_STR()
133 #ifdef CONFIG_FTRACE_SYSCALLS
134 #define TRACE_SYSCALLS() . = ALIGN(8); \
135 VMLINUX_SYMBOL(__start_syscalls_metadata) = .; \
136 *(__syscalls_metadata) \
137 VMLINUX_SYMBOL(__stop_syscalls_metadata) = .;
139 #define TRACE_SYSCALLS()
142 #ifdef CONFIG_CLKSRC_OF
143 #define CLKSRC_OF_TABLES() . = ALIGN(8); \
144 VMLINUX_SYMBOL(__clksrc_of_table) = .; \
145 *(__clksrc_of_table) \
146 *(__clksrc_of_table_end)
148 #define CLKSRC_OF_TABLES()
151 #ifdef CONFIG_IRQCHIP
152 #define IRQCHIP_OF_MATCH_TABLE() \
154 VMLINUX_SYMBOL(__irqchip_begin) = .; \
155 *(__irqchip_of_table) \
158 #define IRQCHIP_OF_MATCH_TABLE()
161 #ifdef CONFIG_COMMON_CLK
162 #define CLK_OF_TABLES() . = ALIGN(8); \
163 VMLINUX_SYMBOL(__clk_of_table) = .; \
165 *(__clk_of_table_end)
167 #define CLK_OF_TABLES()
171 #define CPU_METHOD_OF_TABLES() . = ALIGN(8); \
172 VMLINUX_SYMBOL(__cpu_method_of_table_begin) = .; \
173 *(__cpu_method_of_table) \
174 VMLINUX_SYMBOL(__cpu_method_of_table_end) = .;
176 #define CPU_METHOD_OF_TABLES()
179 #define KERNEL_DTB() \
181 VMLINUX_SYMBOL(__dtb_start) = .; \
182 *(.dtb.init.rodata) \
183 VMLINUX_SYMBOL(__dtb_end) = .;
189 *(.data..shared_aligned) /* percpu related */ \
190 MEM_KEEP(init.data) \
191 MEM_KEEP(exit.data) \
195 /* implement dynamic printk debug */ \
197 VMLINUX_SYMBOL(__start___jump_table) = .; \
199 VMLINUX_SYMBOL(__stop___jump_table) = .; \
201 VMLINUX_SYMBOL(__start___verbose) = .; \
203 VMLINUX_SYMBOL(__stop___verbose) = .; \
210 * Data section helpers
212 #define NOSAVE_DATA \
213 . = ALIGN(PAGE_SIZE); \
214 VMLINUX_SYMBOL(__nosave_begin) = .; \
216 . = ALIGN(PAGE_SIZE); \
217 VMLINUX_SYMBOL(__nosave_end) = .;
219 #define PAGE_ALIGNED_DATA(page_align) \
220 . = ALIGN(page_align); \
221 *(.data..page_aligned)
223 #define READ_MOSTLY_DATA(align) \
225 *(.data..read_mostly) \
228 #define CACHELINE_ALIGNED_DATA(align) \
230 *(.data..cacheline_aligned)
232 #define INIT_TASK_DATA(align) \
239 #define RO_DATA_SECTION(align) \
240 . = ALIGN((align)); \
241 .rodata : AT(ADDR(.rodata) - LOAD_OFFSET) { \
242 VMLINUX_SYMBOL(__start_rodata) = .; \
243 *(.rodata) *(.rodata.*) \
244 *(__vermagic) /* Kernel version magic */ \
246 VMLINUX_SYMBOL(__start___tracepoints_ptrs) = .; \
247 *(__tracepoints_ptrs) /* Tracepoints: pointer array */\
248 VMLINUX_SYMBOL(__stop___tracepoints_ptrs) = .; \
249 *(__tracepoints_strings)/* Tracepoints: strings */ \
252 .rodata1 : AT(ADDR(.rodata1) - LOAD_OFFSET) { \
259 .pci_fixup : AT(ADDR(.pci_fixup) - LOAD_OFFSET) { \
260 VMLINUX_SYMBOL(__start_pci_fixups_early) = .; \
261 *(.pci_fixup_early) \
262 VMLINUX_SYMBOL(__end_pci_fixups_early) = .; \
263 VMLINUX_SYMBOL(__start_pci_fixups_header) = .; \
264 *(.pci_fixup_header) \
265 VMLINUX_SYMBOL(__end_pci_fixups_header) = .; \
266 VMLINUX_SYMBOL(__start_pci_fixups_final) = .; \
267 *(.pci_fixup_final) \
268 VMLINUX_SYMBOL(__end_pci_fixups_final) = .; \
269 VMLINUX_SYMBOL(__start_pci_fixups_enable) = .; \
270 *(.pci_fixup_enable) \
271 VMLINUX_SYMBOL(__end_pci_fixups_enable) = .; \
272 VMLINUX_SYMBOL(__start_pci_fixups_resume) = .; \
273 *(.pci_fixup_resume) \
274 VMLINUX_SYMBOL(__end_pci_fixups_resume) = .; \
275 VMLINUX_SYMBOL(__start_pci_fixups_resume_early) = .; \
276 *(.pci_fixup_resume_early) \
277 VMLINUX_SYMBOL(__end_pci_fixups_resume_early) = .; \
278 VMLINUX_SYMBOL(__start_pci_fixups_suspend) = .; \
279 *(.pci_fixup_suspend) \
280 VMLINUX_SYMBOL(__end_pci_fixups_suspend) = .; \
283 /* Built-in firmware blobs */ \
284 .builtin_fw : AT(ADDR(.builtin_fw) - LOAD_OFFSET) { \
285 VMLINUX_SYMBOL(__start_builtin_fw) = .; \
287 VMLINUX_SYMBOL(__end_builtin_fw) = .; \
292 /* Kernel symbol table: Normal symbols */ \
293 __ksymtab : AT(ADDR(__ksymtab) - LOAD_OFFSET) { \
294 VMLINUX_SYMBOL(__start___ksymtab) = .; \
295 *(SORT(___ksymtab+*)) \
296 VMLINUX_SYMBOL(__stop___ksymtab) = .; \
299 /* Kernel symbol table: GPL-only symbols */ \
300 __ksymtab_gpl : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) { \
301 VMLINUX_SYMBOL(__start___ksymtab_gpl) = .; \
302 *(SORT(___ksymtab_gpl+*)) \
303 VMLINUX_SYMBOL(__stop___ksymtab_gpl) = .; \
306 /* Kernel symbol table: Normal unused symbols */ \
307 __ksymtab_unused : AT(ADDR(__ksymtab_unused) - LOAD_OFFSET) { \
308 VMLINUX_SYMBOL(__start___ksymtab_unused) = .; \
309 *(SORT(___ksymtab_unused+*)) \
310 VMLINUX_SYMBOL(__stop___ksymtab_unused) = .; \
313 /* Kernel symbol table: GPL-only unused symbols */ \
314 __ksymtab_unused_gpl : AT(ADDR(__ksymtab_unused_gpl) - LOAD_OFFSET) { \
315 VMLINUX_SYMBOL(__start___ksymtab_unused_gpl) = .; \
316 *(SORT(___ksymtab_unused_gpl+*)) \
317 VMLINUX_SYMBOL(__stop___ksymtab_unused_gpl) = .; \
320 /* Kernel symbol table: GPL-future-only symbols */ \
321 __ksymtab_gpl_future : AT(ADDR(__ksymtab_gpl_future) - LOAD_OFFSET) { \
322 VMLINUX_SYMBOL(__start___ksymtab_gpl_future) = .; \
323 *(SORT(___ksymtab_gpl_future+*)) \
324 VMLINUX_SYMBOL(__stop___ksymtab_gpl_future) = .; \
327 /* Kernel symbol table: Normal symbols */ \
328 __kcrctab : AT(ADDR(__kcrctab) - LOAD_OFFSET) { \
329 VMLINUX_SYMBOL(__start___kcrctab) = .; \
330 *(SORT(___kcrctab+*)) \
331 VMLINUX_SYMBOL(__stop___kcrctab) = .; \
334 /* Kernel symbol table: GPL-only symbols */ \
335 __kcrctab_gpl : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) { \
336 VMLINUX_SYMBOL(__start___kcrctab_gpl) = .; \
337 *(SORT(___kcrctab_gpl+*)) \
338 VMLINUX_SYMBOL(__stop___kcrctab_gpl) = .; \
341 /* Kernel symbol table: Normal unused symbols */ \
342 __kcrctab_unused : AT(ADDR(__kcrctab_unused) - LOAD_OFFSET) { \
343 VMLINUX_SYMBOL(__start___kcrctab_unused) = .; \
344 *(SORT(___kcrctab_unused+*)) \
345 VMLINUX_SYMBOL(__stop___kcrctab_unused) = .; \
348 /* Kernel symbol table: GPL-only unused symbols */ \
349 __kcrctab_unused_gpl : AT(ADDR(__kcrctab_unused_gpl) - LOAD_OFFSET) { \
350 VMLINUX_SYMBOL(__start___kcrctab_unused_gpl) = .; \
351 *(SORT(___kcrctab_unused_gpl+*)) \
352 VMLINUX_SYMBOL(__stop___kcrctab_unused_gpl) = .; \
355 /* Kernel symbol table: GPL-future-only symbols */ \
356 __kcrctab_gpl_future : AT(ADDR(__kcrctab_gpl_future) - LOAD_OFFSET) { \
357 VMLINUX_SYMBOL(__start___kcrctab_gpl_future) = .; \
358 *(SORT(___kcrctab_gpl_future+*)) \
359 VMLINUX_SYMBOL(__stop___kcrctab_gpl_future) = .; \
362 /* Kernel symbol table: strings */ \
363 __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \
364 *(__ksymtab_strings) \
367 /* __*init sections */ \
368 __init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) { \
370 MEM_KEEP(init.rodata) \
371 MEM_KEEP(exit.rodata) \
374 /* Built-in module parameters. */ \
375 __param : AT(ADDR(__param) - LOAD_OFFSET) { \
376 VMLINUX_SYMBOL(__start___param) = .; \
378 VMLINUX_SYMBOL(__stop___param) = .; \
381 /* Built-in module versions. */ \
382 __modver : AT(ADDR(__modver) - LOAD_OFFSET) { \
383 VMLINUX_SYMBOL(__start___modver) = .; \
385 VMLINUX_SYMBOL(__stop___modver) = .; \
386 . = ALIGN((align)); \
387 VMLINUX_SYMBOL(__end_rodata) = .; \
391 /* RODATA & RO_DATA provided for backward compatibility.
392 * All archs are supposed to use RO_DATA() */
393 #define RODATA RO_DATA_SECTION(4096)
394 #define RO_DATA(align) RO_DATA_SECTION(align)
396 #define SECURITY_INIT \
397 .security_initcall.init : AT(ADDR(.security_initcall.init) - LOAD_OFFSET) { \
398 VMLINUX_SYMBOL(__security_initcall_start) = .; \
399 *(.security_initcall.init) \
400 VMLINUX_SYMBOL(__security_initcall_end) = .; \
403 /* .text section. Map to function alignment to avoid address changes
404 * during second ld run in second ld pass when generating System.map */
410 MEM_KEEP(init.text) \
411 MEM_KEEP(exit.text) \
415 /* sched.text is aling to function alignment to secure we have same
416 * address even at second ld pass when generating System.map */
419 VMLINUX_SYMBOL(__sched_text_start) = .; \
421 VMLINUX_SYMBOL(__sched_text_end) = .;
423 /* spinlock.text is aling to function alignment to secure we have same
424 * address even at second ld pass when generating System.map */
427 VMLINUX_SYMBOL(__lock_text_start) = .; \
429 VMLINUX_SYMBOL(__lock_text_end) = .;
431 #define KPROBES_TEXT \
433 VMLINUX_SYMBOL(__kprobes_text_start) = .; \
435 VMLINUX_SYMBOL(__kprobes_text_end) = .;
439 VMLINUX_SYMBOL(__entry_text_start) = .; \
441 VMLINUX_SYMBOL(__entry_text_end) = .;
443 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
444 #define IRQENTRY_TEXT \
446 VMLINUX_SYMBOL(__irqentry_text_start) = .; \
448 VMLINUX_SYMBOL(__irqentry_text_end) = .;
450 #define IRQENTRY_TEXT
453 /* Section used for early init (in .S files) */
454 #define HEAD_TEXT *(.head.text)
456 #define HEAD_TEXT_SECTION \
457 .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) { \
464 #define EXCEPTION_TABLE(align) \
466 __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) { \
467 VMLINUX_SYMBOL(__start___ex_table) = .; \
469 VMLINUX_SYMBOL(__stop___ex_table) = .; \
475 #define INIT_TASK_DATA_SECTION(align) \
477 .data..init_task : AT(ADDR(.data..init_task) - LOAD_OFFSET) { \
478 INIT_TASK_DATA(align) \
481 #ifdef CONFIG_CONSTRUCTORS
482 #define KERNEL_CTORS() . = ALIGN(8); \
483 VMLINUX_SYMBOL(__ctors_start) = .; \
486 VMLINUX_SYMBOL(__ctors_end) = .;
488 #define KERNEL_CTORS()
491 /* init and exit section handling */
494 MEM_DISCARD(init.data) \
500 MEM_DISCARD(init.rodata) \
503 CPU_METHOD_OF_TABLES() \
505 IRQCHIP_OF_MATCH_TABLE()
509 MEM_DISCARD(init.text)
513 MEM_DISCARD(exit.data) \
514 MEM_DISCARD(exit.rodata)
518 MEM_DISCARD(exit.text)
524 * bss (Block Started by Symbol) - uninitialized data
525 * zeroed during startup
527 #define SBSS(sbss_align) \
528 . = ALIGN(sbss_align); \
529 .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) { \
535 * Allow archectures to redefine BSS_FIRST_SECTIONS to add extra
536 * sections to the front of bss.
538 #ifndef BSS_FIRST_SECTIONS
539 #define BSS_FIRST_SECTIONS
542 #define BSS(bss_align) \
543 . = ALIGN(bss_align); \
544 .bss : AT(ADDR(.bss) - LOAD_OFFSET) { \
546 *(.bss..page_aligned) \
553 * DWARF debug sections.
554 * Symbols in the DWARF debugging sections are relative to
555 * the beginning of the section so we begin them at 0.
557 #define DWARF_DEBUG \
559 .debug 0 : { *(.debug) } \
560 .line 0 : { *(.line) } \
561 /* GNU DWARF 1 extensions */ \
562 .debug_srcinfo 0 : { *(.debug_srcinfo) } \
563 .debug_sfnames 0 : { *(.debug_sfnames) } \
564 /* DWARF 1.1 and DWARF 2 */ \
565 .debug_aranges 0 : { *(.debug_aranges) } \
566 .debug_pubnames 0 : { *(.debug_pubnames) } \
568 .debug_info 0 : { *(.debug_info \
569 .gnu.linkonce.wi.*) } \
570 .debug_abbrev 0 : { *(.debug_abbrev) } \
571 .debug_line 0 : { *(.debug_line) } \
572 .debug_frame 0 : { *(.debug_frame) } \
573 .debug_str 0 : { *(.debug_str) } \
574 .debug_loc 0 : { *(.debug_loc) } \
575 .debug_macinfo 0 : { *(.debug_macinfo) } \
576 /* SGI/MIPS DWARF 2 extensions */ \
577 .debug_weaknames 0 : { *(.debug_weaknames) } \
578 .debug_funcnames 0 : { *(.debug_funcnames) } \
579 .debug_typenames 0 : { *(.debug_typenames) } \
580 .debug_varnames 0 : { *(.debug_varnames) } \
582 /* Stabs debugging sections. */
583 #define STABS_DEBUG \
584 .stab 0 : { *(.stab) } \
585 .stabstr 0 : { *(.stabstr) } \
586 .stab.excl 0 : { *(.stab.excl) } \
587 .stab.exclstr 0 : { *(.stab.exclstr) } \
588 .stab.index 0 : { *(.stab.index) } \
589 .stab.indexstr 0 : { *(.stab.indexstr) } \
590 .comment 0 : { *(.comment) }
592 #ifdef CONFIG_GENERIC_BUG
595 __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) { \
596 VMLINUX_SYMBOL(__start___bug_table) = .; \
598 VMLINUX_SYMBOL(__stop___bug_table) = .; \
604 #ifdef CONFIG_PM_TRACE
607 .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) { \
608 VMLINUX_SYMBOL(__tracedata_start) = .; \
610 VMLINUX_SYMBOL(__tracedata_end) = .; \
617 .notes : AT(ADDR(.notes) - LOAD_OFFSET) { \
618 VMLINUX_SYMBOL(__start_notes) = .; \
620 VMLINUX_SYMBOL(__stop_notes) = .; \
623 #define INIT_SETUP(initsetup_align) \
624 . = ALIGN(initsetup_align); \
625 VMLINUX_SYMBOL(__setup_start) = .; \
627 VMLINUX_SYMBOL(__setup_end) = .;
629 #define INIT_CALLS_LEVEL(level) \
630 VMLINUX_SYMBOL(__initcall##level##_start) = .; \
631 *(.initcall##level##.init) \
632 *(.initcall##level##s.init) \
635 VMLINUX_SYMBOL(__initcall_start) = .; \
636 *(.initcallearly.init) \
637 INIT_CALLS_LEVEL(0) \
638 INIT_CALLS_LEVEL(1) \
639 INIT_CALLS_LEVEL(2) \
640 INIT_CALLS_LEVEL(3) \
641 INIT_CALLS_LEVEL(4) \
642 INIT_CALLS_LEVEL(5) \
643 INIT_CALLS_LEVEL(rootfs) \
644 INIT_CALLS_LEVEL(6) \
645 INIT_CALLS_LEVEL(7) \
646 VMLINUX_SYMBOL(__initcall_end) = .;
648 #define CON_INITCALL \
649 VMLINUX_SYMBOL(__con_initcall_start) = .; \
650 *(.con_initcall.init) \
651 VMLINUX_SYMBOL(__con_initcall_end) = .;
653 #define SECURITY_INITCALL \
654 VMLINUX_SYMBOL(__security_initcall_start) = .; \
655 *(.security_initcall.init) \
656 VMLINUX_SYMBOL(__security_initcall_end) = .;
658 #ifdef CONFIG_BLK_DEV_INITRD
659 #define INIT_RAM_FS \
661 VMLINUX_SYMBOL(__initramfs_start) = .; \
670 * Default discarded sections.
672 * Some archs want to discard exit text/data at runtime rather than
673 * link time due to cross-section references such as alt instructions,
674 * bug table, eh_frame, etc. DISCARDS must be the last of output
675 * section definitions so that such archs put those in earlier section
688 * PERCPU_INPUT - the percpu input sections
689 * @cacheline: cacheline size
691 * The core percpu section names and core symbols which do not rely
692 * directly upon load addresses.
694 * @cacheline is used to align subsections to avoid false cacheline
695 * sharing between subsections for different purposes.
697 #define PERCPU_INPUT(cacheline) \
698 VMLINUX_SYMBOL(__per_cpu_start) = .; \
699 *(.data..percpu..first) \
700 . = ALIGN(PAGE_SIZE); \
701 *(.data..percpu..page_aligned) \
702 . = ALIGN(cacheline); \
703 *(.data..percpu..readmostly) \
704 . = ALIGN(cacheline); \
706 *(.data..percpu..shared_aligned) \
707 VMLINUX_SYMBOL(__per_cpu_end) = .;
710 * PERCPU_VADDR - define output section for percpu area
711 * @cacheline: cacheline size
712 * @vaddr: explicit base address (optional)
713 * @phdr: destination PHDR (optional)
715 * Macro which expands to output section for percpu area.
717 * @cacheline is used to align subsections to avoid false cacheline
718 * sharing between subsections for different purposes.
720 * If @vaddr is not blank, it specifies explicit base address and all
721 * percpu symbols will be offset from the given address. If blank,
722 * @vaddr always equals @laddr + LOAD_OFFSET.
724 * @phdr defines the output PHDR to use if not blank. Be warned that
725 * output PHDR is sticky. If @phdr is specified, the next output
726 * section in the linker script will go there too. @phdr should have
729 * Note that this macros defines __per_cpu_load as an absolute symbol.
730 * If there is no need to put the percpu section at a predetermined
731 * address, use PERCPU_SECTION.
733 #define PERCPU_VADDR(cacheline, vaddr, phdr) \
734 VMLINUX_SYMBOL(__per_cpu_load) = .; \
735 .data..percpu vaddr : AT(VMLINUX_SYMBOL(__per_cpu_load) \
737 PERCPU_INPUT(cacheline) \
739 . = VMLINUX_SYMBOL(__per_cpu_load) + SIZEOF(.data..percpu);
742 * PERCPU_SECTION - define output section for percpu area, simple version
743 * @cacheline: cacheline size
745 * Align to PAGE_SIZE and outputs output section for percpu area. This
746 * macro doesn't manipulate @vaddr or @phdr and __per_cpu_load and
747 * __per_cpu_start will be identical.
749 * This macro is equivalent to ALIGN(PAGE_SIZE); PERCPU_VADDR(@cacheline,,)
750 * except that __per_cpu_load is defined as a relative symbol against
751 * .data..percpu which is required for relocatable x86_32 configuration.
753 #define PERCPU_SECTION(cacheline) \
754 . = ALIGN(PAGE_SIZE); \
755 .data..percpu : AT(ADDR(.data..percpu) - LOAD_OFFSET) { \
756 VMLINUX_SYMBOL(__per_cpu_load) = .; \
757 PERCPU_INPUT(cacheline) \
762 * Definition of the high level *_SECTION macros
763 * They will fit only a subset of the architectures
769 * All sections are combined in a single .data section.
770 * The sections following CONSTRUCTORS are arranged so their
771 * typical alignment matches.
772 * A cacheline is typical/always less than a PAGE_SIZE so
773 * the sections that has this restriction (or similar)
774 * is located before the ones requiring PAGE_SIZE alignment.
775 * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which
776 * matches the requirement of PAGE_ALIGNED_DATA.
778 * use 0 as page_align if page_aligned data is not used */
779 #define RW_DATA_SECTION(cacheline, pagealigned, inittask) \
780 . = ALIGN(PAGE_SIZE); \
781 .data : AT(ADDR(.data) - LOAD_OFFSET) { \
782 INIT_TASK_DATA(inittask) \
784 PAGE_ALIGNED_DATA(pagealigned) \
785 CACHELINE_ALIGNED_DATA(cacheline) \
786 READ_MOSTLY_DATA(cacheline) \
791 #define INIT_TEXT_SECTION(inittext_align) \
792 . = ALIGN(inittext_align); \
793 .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) { \
794 VMLINUX_SYMBOL(_sinittext) = .; \
796 VMLINUX_SYMBOL(_einittext) = .; \
799 #define INIT_DATA_SECTION(initsetup_align) \
800 .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) { \
802 INIT_SETUP(initsetup_align) \
809 #define BSS_SECTION(sbss_align, bss_align, stop_align) \
810 . = ALIGN(sbss_align); \
811 VMLINUX_SYMBOL(__bss_start) = .; \
814 . = ALIGN(stop_align); \
815 VMLINUX_SYMBOL(__bss_stop) = .;