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) = .;
126 #define TRACE_PRINTKS()
129 #ifdef CONFIG_FTRACE_SYSCALLS
130 #define TRACE_SYSCALLS() . = ALIGN(8); \
131 VMLINUX_SYMBOL(__start_syscalls_metadata) = .; \
132 *(__syscalls_metadata) \
133 VMLINUX_SYMBOL(__stop_syscalls_metadata) = .;
135 #define TRACE_SYSCALLS()
138 #ifdef CONFIG_CLKSRC_OF
139 #define CLKSRC_OF_TABLES() . = ALIGN(8); \
140 VMLINUX_SYMBOL(__clksrc_of_table) = .; \
141 *(__clksrc_of_table) \
142 *(__clksrc_of_table_end)
144 #define CLKSRC_OF_TABLES()
147 #ifdef CONFIG_IRQCHIP
148 #define IRQCHIP_OF_MATCH_TABLE() \
150 VMLINUX_SYMBOL(__irqchip_begin) = .; \
151 *(__irqchip_of_table) \
154 #define IRQCHIP_OF_MATCH_TABLE()
157 #ifdef CONFIG_COMMON_CLK
158 #define CLK_OF_TABLES() . = ALIGN(8); \
159 VMLINUX_SYMBOL(__clk_of_table) = .; \
161 *(__clk_of_table_end)
163 #define CLK_OF_TABLES()
166 #define KERNEL_DTB() \
168 VMLINUX_SYMBOL(__dtb_start) = .; \
169 *(.dtb.init.rodata) \
170 VMLINUX_SYMBOL(__dtb_end) = .;
176 *(.data..shared_aligned) /* percpu related */ \
177 CPU_KEEP(init.data) \
178 CPU_KEEP(exit.data) \
179 MEM_KEEP(init.data) \
180 MEM_KEEP(exit.data) \
184 /* implement dynamic printk debug */ \
186 VMLINUX_SYMBOL(__start___jump_table) = .; \
188 VMLINUX_SYMBOL(__stop___jump_table) = .; \
190 VMLINUX_SYMBOL(__start___verbose) = .; \
192 VMLINUX_SYMBOL(__stop___verbose) = .; \
198 * Data section helpers
200 #define NOSAVE_DATA \
201 . = ALIGN(PAGE_SIZE); \
202 VMLINUX_SYMBOL(__nosave_begin) = .; \
204 . = ALIGN(PAGE_SIZE); \
205 VMLINUX_SYMBOL(__nosave_end) = .;
207 #define PAGE_ALIGNED_DATA(page_align) \
208 . = ALIGN(page_align); \
209 *(.data..page_aligned)
211 #define READ_MOSTLY_DATA(align) \
213 *(.data..read_mostly) \
216 #define CACHELINE_ALIGNED_DATA(align) \
218 *(.data..cacheline_aligned)
220 #define INIT_TASK_DATA(align) \
227 #define RO_DATA_SECTION(align) \
228 . = ALIGN((align)); \
229 .rodata : AT(ADDR(.rodata) - LOAD_OFFSET) { \
230 VMLINUX_SYMBOL(__start_rodata) = .; \
231 *(.rodata) *(.rodata.*) \
232 *(__vermagic) /* Kernel version magic */ \
234 VMLINUX_SYMBOL(__start___tracepoints_ptrs) = .; \
235 *(__tracepoints_ptrs) /* Tracepoints: pointer array */\
236 VMLINUX_SYMBOL(__stop___tracepoints_ptrs) = .; \
237 *(__tracepoints_strings)/* Tracepoints: strings */ \
240 .rodata1 : AT(ADDR(.rodata1) - LOAD_OFFSET) { \
247 .pci_fixup : AT(ADDR(.pci_fixup) - LOAD_OFFSET) { \
248 VMLINUX_SYMBOL(__start_pci_fixups_early) = .; \
249 *(.pci_fixup_early) \
250 VMLINUX_SYMBOL(__end_pci_fixups_early) = .; \
251 VMLINUX_SYMBOL(__start_pci_fixups_header) = .; \
252 *(.pci_fixup_header) \
253 VMLINUX_SYMBOL(__end_pci_fixups_header) = .; \
254 VMLINUX_SYMBOL(__start_pci_fixups_final) = .; \
255 *(.pci_fixup_final) \
256 VMLINUX_SYMBOL(__end_pci_fixups_final) = .; \
257 VMLINUX_SYMBOL(__start_pci_fixups_enable) = .; \
258 *(.pci_fixup_enable) \
259 VMLINUX_SYMBOL(__end_pci_fixups_enable) = .; \
260 VMLINUX_SYMBOL(__start_pci_fixups_resume) = .; \
261 *(.pci_fixup_resume) \
262 VMLINUX_SYMBOL(__end_pci_fixups_resume) = .; \
263 VMLINUX_SYMBOL(__start_pci_fixups_resume_early) = .; \
264 *(.pci_fixup_resume_early) \
265 VMLINUX_SYMBOL(__end_pci_fixups_resume_early) = .; \
266 VMLINUX_SYMBOL(__start_pci_fixups_suspend) = .; \
267 *(.pci_fixup_suspend) \
268 VMLINUX_SYMBOL(__end_pci_fixups_suspend) = .; \
271 /* Built-in firmware blobs */ \
272 .builtin_fw : AT(ADDR(.builtin_fw) - LOAD_OFFSET) { \
273 VMLINUX_SYMBOL(__start_builtin_fw) = .; \
275 VMLINUX_SYMBOL(__end_builtin_fw) = .; \
278 /* RapidIO route ops */ \
279 .rio_ops : AT(ADDR(.rio_ops) - LOAD_OFFSET) { \
280 VMLINUX_SYMBOL(__start_rio_switch_ops) = .; \
282 VMLINUX_SYMBOL(__end_rio_switch_ops) = .; \
287 /* Kernel symbol table: Normal symbols */ \
288 __ksymtab : AT(ADDR(__ksymtab) - LOAD_OFFSET) { \
289 VMLINUX_SYMBOL(__start___ksymtab) = .; \
290 *(SORT(___ksymtab+*)) \
291 VMLINUX_SYMBOL(__stop___ksymtab) = .; \
294 /* Kernel symbol table: GPL-only symbols */ \
295 __ksymtab_gpl : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) { \
296 VMLINUX_SYMBOL(__start___ksymtab_gpl) = .; \
297 *(SORT(___ksymtab_gpl+*)) \
298 VMLINUX_SYMBOL(__stop___ksymtab_gpl) = .; \
301 /* Kernel symbol table: Normal unused symbols */ \
302 __ksymtab_unused : AT(ADDR(__ksymtab_unused) - LOAD_OFFSET) { \
303 VMLINUX_SYMBOL(__start___ksymtab_unused) = .; \
304 *(SORT(___ksymtab_unused+*)) \
305 VMLINUX_SYMBOL(__stop___ksymtab_unused) = .; \
308 /* Kernel symbol table: GPL-only unused symbols */ \
309 __ksymtab_unused_gpl : AT(ADDR(__ksymtab_unused_gpl) - LOAD_OFFSET) { \
310 VMLINUX_SYMBOL(__start___ksymtab_unused_gpl) = .; \
311 *(SORT(___ksymtab_unused_gpl+*)) \
312 VMLINUX_SYMBOL(__stop___ksymtab_unused_gpl) = .; \
315 /* Kernel symbol table: GPL-future-only symbols */ \
316 __ksymtab_gpl_future : AT(ADDR(__ksymtab_gpl_future) - LOAD_OFFSET) { \
317 VMLINUX_SYMBOL(__start___ksymtab_gpl_future) = .; \
318 *(SORT(___ksymtab_gpl_future+*)) \
319 VMLINUX_SYMBOL(__stop___ksymtab_gpl_future) = .; \
322 /* Kernel symbol table: Normal symbols */ \
323 __kcrctab : AT(ADDR(__kcrctab) - LOAD_OFFSET) { \
324 VMLINUX_SYMBOL(__start___kcrctab) = .; \
325 *(SORT(___kcrctab+*)) \
326 VMLINUX_SYMBOL(__stop___kcrctab) = .; \
329 /* Kernel symbol table: GPL-only symbols */ \
330 __kcrctab_gpl : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) { \
331 VMLINUX_SYMBOL(__start___kcrctab_gpl) = .; \
332 *(SORT(___kcrctab_gpl+*)) \
333 VMLINUX_SYMBOL(__stop___kcrctab_gpl) = .; \
336 /* Kernel symbol table: Normal unused symbols */ \
337 __kcrctab_unused : AT(ADDR(__kcrctab_unused) - LOAD_OFFSET) { \
338 VMLINUX_SYMBOL(__start___kcrctab_unused) = .; \
339 *(SORT(___kcrctab_unused+*)) \
340 VMLINUX_SYMBOL(__stop___kcrctab_unused) = .; \
343 /* Kernel symbol table: GPL-only unused symbols */ \
344 __kcrctab_unused_gpl : AT(ADDR(__kcrctab_unused_gpl) - LOAD_OFFSET) { \
345 VMLINUX_SYMBOL(__start___kcrctab_unused_gpl) = .; \
346 *(SORT(___kcrctab_unused_gpl+*)) \
347 VMLINUX_SYMBOL(__stop___kcrctab_unused_gpl) = .; \
350 /* Kernel symbol table: GPL-future-only symbols */ \
351 __kcrctab_gpl_future : AT(ADDR(__kcrctab_gpl_future) - LOAD_OFFSET) { \
352 VMLINUX_SYMBOL(__start___kcrctab_gpl_future) = .; \
353 *(SORT(___kcrctab_gpl_future+*)) \
354 VMLINUX_SYMBOL(__stop___kcrctab_gpl_future) = .; \
357 /* Kernel symbol table: strings */ \
358 __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \
359 *(__ksymtab_strings) \
362 /* __*init sections */ \
363 __init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) { \
365 CPU_KEEP(init.rodata) \
366 CPU_KEEP(exit.rodata) \
367 MEM_KEEP(init.rodata) \
368 MEM_KEEP(exit.rodata) \
371 /* Built-in module parameters. */ \
372 __param : AT(ADDR(__param) - LOAD_OFFSET) { \
373 VMLINUX_SYMBOL(__start___param) = .; \
375 VMLINUX_SYMBOL(__stop___param) = .; \
378 /* Built-in module versions. */ \
379 __modver : AT(ADDR(__modver) - LOAD_OFFSET) { \
380 VMLINUX_SYMBOL(__start___modver) = .; \
382 VMLINUX_SYMBOL(__stop___modver) = .; \
383 . = ALIGN((align)); \
384 VMLINUX_SYMBOL(__end_rodata) = .; \
388 /* RODATA & RO_DATA provided for backward compatibility.
389 * All archs are supposed to use RO_DATA() */
390 #define RODATA RO_DATA_SECTION(4096)
391 #define RO_DATA(align) RO_DATA_SECTION(align)
393 #define SECURITY_INIT \
394 .security_initcall.init : AT(ADDR(.security_initcall.init) - LOAD_OFFSET) { \
395 VMLINUX_SYMBOL(__security_initcall_start) = .; \
396 *(.security_initcall.init) \
397 VMLINUX_SYMBOL(__security_initcall_end) = .; \
400 /* .text section. Map to function alignment to avoid address changes
401 * during second ld run in second ld pass when generating System.map */
407 CPU_KEEP(init.text) \
408 CPU_KEEP(exit.text) \
409 MEM_KEEP(init.text) \
410 MEM_KEEP(exit.text) \
414 /* sched.text is aling to function alignment to secure we have same
415 * address even at second ld pass when generating System.map */
418 VMLINUX_SYMBOL(__sched_text_start) = .; \
420 VMLINUX_SYMBOL(__sched_text_end) = .;
422 /* spinlock.text is aling to function alignment to secure we have same
423 * address even at second ld pass when generating System.map */
426 VMLINUX_SYMBOL(__lock_text_start) = .; \
428 VMLINUX_SYMBOL(__lock_text_end) = .;
430 #define KPROBES_TEXT \
432 VMLINUX_SYMBOL(__kprobes_text_start) = .; \
434 VMLINUX_SYMBOL(__kprobes_text_end) = .;
438 VMLINUX_SYMBOL(__entry_text_start) = .; \
440 VMLINUX_SYMBOL(__entry_text_end) = .;
442 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
443 #define IRQENTRY_TEXT \
445 VMLINUX_SYMBOL(__irqentry_text_start) = .; \
447 VMLINUX_SYMBOL(__irqentry_text_end) = .;
449 #define IRQENTRY_TEXT
452 /* Section used for early init (in .S files) */
453 #define HEAD_TEXT *(.head.text)
455 #define HEAD_TEXT_SECTION \
456 .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) { \
463 #define EXCEPTION_TABLE(align) \
465 __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) { \
466 VMLINUX_SYMBOL(__start___ex_table) = .; \
468 VMLINUX_SYMBOL(__stop___ex_table) = .; \
474 #define INIT_TASK_DATA_SECTION(align) \
476 .data..init_task : AT(ADDR(.data..init_task) - LOAD_OFFSET) { \
477 INIT_TASK_DATA(align) \
480 #ifdef CONFIG_CONSTRUCTORS
481 #define KERNEL_CTORS() . = ALIGN(8); \
482 VMLINUX_SYMBOL(__ctors_start) = .; \
484 VMLINUX_SYMBOL(__ctors_end) = .;
486 #define KERNEL_CTORS()
489 /* init and exit section handling */
492 CPU_DISCARD(init.data) \
493 MEM_DISCARD(init.data) \
499 CPU_DISCARD(init.rodata) \
500 MEM_DISCARD(init.rodata) \
504 IRQCHIP_OF_MATCH_TABLE()
508 CPU_DISCARD(init.text) \
509 MEM_DISCARD(init.text)
513 CPU_DISCARD(exit.data) \
514 CPU_DISCARD(exit.rodata) \
515 MEM_DISCARD(exit.data) \
516 MEM_DISCARD(exit.rodata)
520 CPU_DISCARD(exit.text) \
521 MEM_DISCARD(exit.text)
527 * bss (Block Started by Symbol) - uninitialized data
528 * zeroed during startup
530 #define SBSS(sbss_align) \
531 . = ALIGN(sbss_align); \
532 .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) { \
538 * Allow archectures to redefine BSS_FIRST_SECTIONS to add extra
539 * sections to the front of bss.
541 #ifndef BSS_FIRST_SECTIONS
542 #define BSS_FIRST_SECTIONS
545 #define BSS(bss_align) \
546 . = ALIGN(bss_align); \
547 .bss : AT(ADDR(.bss) - LOAD_OFFSET) { \
549 *(.bss..page_aligned) \
556 * DWARF debug sections.
557 * Symbols in the DWARF debugging sections are relative to
558 * the beginning of the section so we begin them at 0.
560 #define DWARF_DEBUG \
562 .debug 0 : { *(.debug) } \
563 .line 0 : { *(.line) } \
564 /* GNU DWARF 1 extensions */ \
565 .debug_srcinfo 0 : { *(.debug_srcinfo) } \
566 .debug_sfnames 0 : { *(.debug_sfnames) } \
567 /* DWARF 1.1 and DWARF 2 */ \
568 .debug_aranges 0 : { *(.debug_aranges) } \
569 .debug_pubnames 0 : { *(.debug_pubnames) } \
571 .debug_info 0 : { *(.debug_info \
572 .gnu.linkonce.wi.*) } \
573 .debug_abbrev 0 : { *(.debug_abbrev) } \
574 .debug_line 0 : { *(.debug_line) } \
575 .debug_frame 0 : { *(.debug_frame) } \
576 .debug_str 0 : { *(.debug_str) } \
577 .debug_loc 0 : { *(.debug_loc) } \
578 .debug_macinfo 0 : { *(.debug_macinfo) } \
579 /* SGI/MIPS DWARF 2 extensions */ \
580 .debug_weaknames 0 : { *(.debug_weaknames) } \
581 .debug_funcnames 0 : { *(.debug_funcnames) } \
582 .debug_typenames 0 : { *(.debug_typenames) } \
583 .debug_varnames 0 : { *(.debug_varnames) } \
585 /* Stabs debugging sections. */
586 #define STABS_DEBUG \
587 .stab 0 : { *(.stab) } \
588 .stabstr 0 : { *(.stabstr) } \
589 .stab.excl 0 : { *(.stab.excl) } \
590 .stab.exclstr 0 : { *(.stab.exclstr) } \
591 .stab.index 0 : { *(.stab.index) } \
592 .stab.indexstr 0 : { *(.stab.indexstr) } \
593 .comment 0 : { *(.comment) }
595 #ifdef CONFIG_GENERIC_BUG
598 __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) { \
599 VMLINUX_SYMBOL(__start___bug_table) = .; \
601 VMLINUX_SYMBOL(__stop___bug_table) = .; \
607 #ifdef CONFIG_PM_TRACE
610 .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) { \
611 VMLINUX_SYMBOL(__tracedata_start) = .; \
613 VMLINUX_SYMBOL(__tracedata_end) = .; \
620 .notes : AT(ADDR(.notes) - LOAD_OFFSET) { \
621 VMLINUX_SYMBOL(__start_notes) = .; \
623 VMLINUX_SYMBOL(__stop_notes) = .; \
626 #define INIT_SETUP(initsetup_align) \
627 . = ALIGN(initsetup_align); \
628 VMLINUX_SYMBOL(__setup_start) = .; \
630 VMLINUX_SYMBOL(__setup_end) = .;
632 #define INIT_CALLS_LEVEL(level) \
633 VMLINUX_SYMBOL(__initcall##level##_start) = .; \
634 *(.initcall##level##.init) \
635 *(.initcall##level##s.init) \
638 VMLINUX_SYMBOL(__initcall_start) = .; \
639 *(.initcallearly.init) \
640 INIT_CALLS_LEVEL(0) \
641 INIT_CALLS_LEVEL(1) \
642 INIT_CALLS_LEVEL(2) \
643 INIT_CALLS_LEVEL(3) \
644 INIT_CALLS_LEVEL(4) \
645 INIT_CALLS_LEVEL(5) \
646 INIT_CALLS_LEVEL(rootfs) \
647 INIT_CALLS_LEVEL(6) \
648 INIT_CALLS_LEVEL(7) \
649 VMLINUX_SYMBOL(__initcall_end) = .;
651 #define CON_INITCALL \
652 VMLINUX_SYMBOL(__con_initcall_start) = .; \
653 *(.con_initcall.init) \
654 VMLINUX_SYMBOL(__con_initcall_end) = .;
656 #define SECURITY_INITCALL \
657 VMLINUX_SYMBOL(__security_initcall_start) = .; \
658 *(.security_initcall.init) \
659 VMLINUX_SYMBOL(__security_initcall_end) = .;
661 #ifdef CONFIG_BLK_DEV_INITRD
662 #define INIT_RAM_FS \
664 VMLINUX_SYMBOL(__initramfs_start) = .; \
673 * Default discarded sections.
675 * Some archs want to discard exit text/data at runtime rather than
676 * link time due to cross-section references such as alt instructions,
677 * bug table, eh_frame, etc. DISCARDS must be the last of output
678 * section definitions so that such archs put those in earlier section
691 * PERCPU_INPUT - the percpu input sections
692 * @cacheline: cacheline size
694 * The core percpu section names and core symbols which do not rely
695 * directly upon load addresses.
697 * @cacheline is used to align subsections to avoid false cacheline
698 * sharing between subsections for different purposes.
700 #define PERCPU_INPUT(cacheline) \
701 VMLINUX_SYMBOL(__per_cpu_start) = .; \
702 *(.data..percpu..first) \
703 . = ALIGN(PAGE_SIZE); \
704 *(.data..percpu..page_aligned) \
705 . = ALIGN(cacheline); \
706 *(.data..percpu..readmostly) \
707 . = ALIGN(cacheline); \
709 *(.data..percpu..shared_aligned) \
710 VMLINUX_SYMBOL(__per_cpu_end) = .;
713 * PERCPU_VADDR - define output section for percpu area
714 * @cacheline: cacheline size
715 * @vaddr: explicit base address (optional)
716 * @phdr: destination PHDR (optional)
718 * Macro which expands to output section for percpu area.
720 * @cacheline is used to align subsections to avoid false cacheline
721 * sharing between subsections for different purposes.
723 * If @vaddr is not blank, it specifies explicit base address and all
724 * percpu symbols will be offset from the given address. If blank,
725 * @vaddr always equals @laddr + LOAD_OFFSET.
727 * @phdr defines the output PHDR to use if not blank. Be warned that
728 * output PHDR is sticky. If @phdr is specified, the next output
729 * section in the linker script will go there too. @phdr should have
732 * Note that this macros defines __per_cpu_load as an absolute symbol.
733 * If there is no need to put the percpu section at a predetermined
734 * address, use PERCPU_SECTION.
736 #define PERCPU_VADDR(cacheline, vaddr, phdr) \
737 VMLINUX_SYMBOL(__per_cpu_load) = .; \
738 .data..percpu vaddr : AT(VMLINUX_SYMBOL(__per_cpu_load) \
740 PERCPU_INPUT(cacheline) \
742 . = VMLINUX_SYMBOL(__per_cpu_load) + SIZEOF(.data..percpu);
745 * PERCPU_SECTION - define output section for percpu area, simple version
746 * @cacheline: cacheline size
748 * Align to PAGE_SIZE and outputs output section for percpu area. This
749 * macro doesn't manipulate @vaddr or @phdr and __per_cpu_load and
750 * __per_cpu_start will be identical.
752 * This macro is equivalent to ALIGN(PAGE_SIZE); PERCPU_VADDR(@cacheline,,)
753 * except that __per_cpu_load is defined as a relative symbol against
754 * .data..percpu which is required for relocatable x86_32 configuration.
756 #define PERCPU_SECTION(cacheline) \
757 . = ALIGN(PAGE_SIZE); \
758 .data..percpu : AT(ADDR(.data..percpu) - LOAD_OFFSET) { \
759 VMLINUX_SYMBOL(__per_cpu_load) = .; \
760 PERCPU_INPUT(cacheline) \
765 * Definition of the high level *_SECTION macros
766 * They will fit only a subset of the architectures
772 * All sections are combined in a single .data section.
773 * The sections following CONSTRUCTORS are arranged so their
774 * typical alignment matches.
775 * A cacheline is typical/always less than a PAGE_SIZE so
776 * the sections that has this restriction (or similar)
777 * is located before the ones requiring PAGE_SIZE alignment.
778 * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which
779 * matches the requirement of PAGE_ALIGNED_DATA.
781 * use 0 as page_align if page_aligned data is not used */
782 #define RW_DATA_SECTION(cacheline, pagealigned, inittask) \
783 . = ALIGN(PAGE_SIZE); \
784 .data : AT(ADDR(.data) - LOAD_OFFSET) { \
785 INIT_TASK_DATA(inittask) \
787 PAGE_ALIGNED_DATA(pagealigned) \
788 CACHELINE_ALIGNED_DATA(cacheline) \
789 READ_MOSTLY_DATA(cacheline) \
794 #define INIT_TEXT_SECTION(inittext_align) \
795 . = ALIGN(inittext_align); \
796 .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) { \
797 VMLINUX_SYMBOL(_sinittext) = .; \
799 VMLINUX_SYMBOL(_einittext) = .; \
802 #define INIT_DATA_SECTION(initsetup_align) \
803 .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) { \
805 INIT_SETUP(initsetup_align) \
812 #define BSS_SECTION(sbss_align, bss_align, stop_align) \
813 . = ALIGN(sbss_align); \
814 VMLINUX_SYMBOL(__bss_start) = .; \
817 . = ALIGN(stop_align); \
818 VMLINUX_SYMBOL(__bss_stop) = .;