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
56 #define VMLINUX_SYMBOL(sym) sym
58 #define PASTE2(x,y) x##y
59 #define PASTE(x,y) PASTE2(x,y)
60 #define VMLINUX_SYMBOL(sym) PASTE(SYMBOL_PREFIX, sym)
63 /* Align . to a 8 byte boundary equals to maximum function alignment. */
64 #define ALIGN_FUNCTION() . = ALIGN(8)
67 * Align to a 32 byte boundary equal to the
68 * alignment gcc 4.5 uses for a struct
70 #define STRUCT_ALIGNMENT 32
71 #define STRUCT_ALIGN() . = ALIGN(STRUCT_ALIGNMENT)
73 /* The actual configuration determine if the init/exit sections
74 * are handled as text/data or they can be discarded (which
75 * often happens at runtime)
78 #define DEV_KEEP(sec) *(.dev##sec)
79 #define DEV_DISCARD(sec)
82 #define DEV_DISCARD(sec) *(.dev##sec)
85 #ifdef CONFIG_HOTPLUG_CPU
86 #define CPU_KEEP(sec) *(.cpu##sec)
87 #define CPU_DISCARD(sec)
90 #define CPU_DISCARD(sec) *(.cpu##sec)
93 #if defined(CONFIG_MEMORY_HOTPLUG)
94 #define MEM_KEEP(sec) *(.mem##sec)
95 #define MEM_DISCARD(sec)
98 #define MEM_DISCARD(sec) *(.mem##sec)
101 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
102 #define MCOUNT_REC() . = ALIGN(8); \
103 VMLINUX_SYMBOL(__start_mcount_loc) = .; \
105 VMLINUX_SYMBOL(__stop_mcount_loc) = .;
110 #ifdef CONFIG_TRACE_BRANCH_PROFILING
111 #define LIKELY_PROFILE() VMLINUX_SYMBOL(__start_annotated_branch_profile) = .; \
112 *(_ftrace_annotated_branch) \
113 VMLINUX_SYMBOL(__stop_annotated_branch_profile) = .;
115 #define LIKELY_PROFILE()
118 #ifdef CONFIG_PROFILE_ALL_BRANCHES
119 #define BRANCH_PROFILE() VMLINUX_SYMBOL(__start_branch_profile) = .; \
121 VMLINUX_SYMBOL(__stop_branch_profile) = .;
123 #define BRANCH_PROFILE()
126 #ifdef CONFIG_EVENT_TRACING
127 #define FTRACE_EVENTS() . = ALIGN(8); \
128 VMLINUX_SYMBOL(__start_ftrace_events) = .; \
130 VMLINUX_SYMBOL(__stop_ftrace_events) = .;
132 #define FTRACE_EVENTS()
135 #ifdef CONFIG_TRACING
136 #define TRACE_PRINTKS() VMLINUX_SYMBOL(__start___trace_bprintk_fmt) = .; \
137 *(__trace_printk_fmt) /* Trace_printk fmt' pointer */ \
138 VMLINUX_SYMBOL(__stop___trace_bprintk_fmt) = .;
140 #define TRACE_PRINTKS()
143 #ifdef CONFIG_FTRACE_SYSCALLS
144 #define TRACE_SYSCALLS() . = ALIGN(8); \
145 VMLINUX_SYMBOL(__start_syscalls_metadata) = .; \
146 *(__syscalls_metadata) \
147 VMLINUX_SYMBOL(__stop_syscalls_metadata) = .;
149 #define TRACE_SYSCALLS()
152 #ifdef CONFIG_CLKSRC_OF
153 #define CLKSRC_OF_TABLES() . = ALIGN(8); \
154 VMLINUX_SYMBOL(__clksrc_of_table) = .; \
155 *(__clksrc_of_table) \
156 *(__clksrc_of_table_end)
158 #define CLKSRC_OF_TABLES()
161 #ifdef CONFIG_IRQCHIP
162 #define IRQCHIP_OF_MATCH_TABLE() \
164 VMLINUX_SYMBOL(__irqchip_begin) = .; \
165 *(__irqchip_of_table) \
168 #define IRQCHIP_OF_MATCH_TABLE()
171 #ifdef CONFIG_COMMON_CLK
172 #define CLK_OF_TABLES() . = ALIGN(8); \
173 VMLINUX_SYMBOL(__clk_of_table) = .; \
175 *(__clk_of_table_end)
177 #define CLK_OF_TABLES()
180 #define KERNEL_DTB() \
182 VMLINUX_SYMBOL(__dtb_start) = .; \
183 *(.dtb.init.rodata) \
184 VMLINUX_SYMBOL(__dtb_end) = .;
190 *(.data..shared_aligned) /* percpu related */ \
191 DEV_KEEP(init.data) \
192 DEV_KEEP(exit.data) \
193 CPU_KEEP(init.data) \
194 CPU_KEEP(exit.data) \
195 MEM_KEEP(init.data) \
196 MEM_KEEP(exit.data) \
200 /* implement dynamic printk debug */ \
202 VMLINUX_SYMBOL(__start___jump_table) = .; \
204 VMLINUX_SYMBOL(__stop___jump_table) = .; \
206 VMLINUX_SYMBOL(__start___verbose) = .; \
208 VMLINUX_SYMBOL(__stop___verbose) = .; \
214 * Data section helpers
216 #define NOSAVE_DATA \
217 . = ALIGN(PAGE_SIZE); \
218 VMLINUX_SYMBOL(__nosave_begin) = .; \
220 . = ALIGN(PAGE_SIZE); \
221 VMLINUX_SYMBOL(__nosave_end) = .;
223 #define PAGE_ALIGNED_DATA(page_align) \
224 . = ALIGN(page_align); \
225 *(.data..page_aligned)
227 #define READ_MOSTLY_DATA(align) \
229 *(.data..read_mostly) \
232 #define CACHELINE_ALIGNED_DATA(align) \
234 *(.data..cacheline_aligned)
236 #define INIT_TASK_DATA(align) \
243 #define RO_DATA_SECTION(align) \
244 . = ALIGN((align)); \
245 .rodata : AT(ADDR(.rodata) - LOAD_OFFSET) { \
246 VMLINUX_SYMBOL(__start_rodata) = .; \
247 *(.rodata) *(.rodata.*) \
248 *(__vermagic) /* Kernel version magic */ \
250 VMLINUX_SYMBOL(__start___tracepoints_ptrs) = .; \
251 *(__tracepoints_ptrs) /* Tracepoints: pointer array */\
252 VMLINUX_SYMBOL(__stop___tracepoints_ptrs) = .; \
253 *(__tracepoints_strings)/* Tracepoints: strings */ \
256 .rodata1 : AT(ADDR(.rodata1) - LOAD_OFFSET) { \
263 .pci_fixup : AT(ADDR(.pci_fixup) - LOAD_OFFSET) { \
264 VMLINUX_SYMBOL(__start_pci_fixups_early) = .; \
265 *(.pci_fixup_early) \
266 VMLINUX_SYMBOL(__end_pci_fixups_early) = .; \
267 VMLINUX_SYMBOL(__start_pci_fixups_header) = .; \
268 *(.pci_fixup_header) \
269 VMLINUX_SYMBOL(__end_pci_fixups_header) = .; \
270 VMLINUX_SYMBOL(__start_pci_fixups_final) = .; \
271 *(.pci_fixup_final) \
272 VMLINUX_SYMBOL(__end_pci_fixups_final) = .; \
273 VMLINUX_SYMBOL(__start_pci_fixups_enable) = .; \
274 *(.pci_fixup_enable) \
275 VMLINUX_SYMBOL(__end_pci_fixups_enable) = .; \
276 VMLINUX_SYMBOL(__start_pci_fixups_resume) = .; \
277 *(.pci_fixup_resume) \
278 VMLINUX_SYMBOL(__end_pci_fixups_resume) = .; \
279 VMLINUX_SYMBOL(__start_pci_fixups_resume_early) = .; \
280 *(.pci_fixup_resume_early) \
281 VMLINUX_SYMBOL(__end_pci_fixups_resume_early) = .; \
282 VMLINUX_SYMBOL(__start_pci_fixups_suspend) = .; \
283 *(.pci_fixup_suspend) \
284 VMLINUX_SYMBOL(__end_pci_fixups_suspend) = .; \
287 /* Built-in firmware blobs */ \
288 .builtin_fw : AT(ADDR(.builtin_fw) - LOAD_OFFSET) { \
289 VMLINUX_SYMBOL(__start_builtin_fw) = .; \
291 VMLINUX_SYMBOL(__end_builtin_fw) = .; \
294 /* RapidIO route ops */ \
295 .rio_ops : AT(ADDR(.rio_ops) - LOAD_OFFSET) { \
296 VMLINUX_SYMBOL(__start_rio_switch_ops) = .; \
298 VMLINUX_SYMBOL(__end_rio_switch_ops) = .; \
303 /* Kernel symbol table: Normal symbols */ \
304 __ksymtab : AT(ADDR(__ksymtab) - LOAD_OFFSET) { \
305 VMLINUX_SYMBOL(__start___ksymtab) = .; \
306 *(SORT(___ksymtab+*)) \
307 VMLINUX_SYMBOL(__stop___ksymtab) = .; \
310 /* Kernel symbol table: GPL-only symbols */ \
311 __ksymtab_gpl : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) { \
312 VMLINUX_SYMBOL(__start___ksymtab_gpl) = .; \
313 *(SORT(___ksymtab_gpl+*)) \
314 VMLINUX_SYMBOL(__stop___ksymtab_gpl) = .; \
317 /* Kernel symbol table: Normal unused symbols */ \
318 __ksymtab_unused : AT(ADDR(__ksymtab_unused) - LOAD_OFFSET) { \
319 VMLINUX_SYMBOL(__start___ksymtab_unused) = .; \
320 *(SORT(___ksymtab_unused+*)) \
321 VMLINUX_SYMBOL(__stop___ksymtab_unused) = .; \
324 /* Kernel symbol table: GPL-only unused symbols */ \
325 __ksymtab_unused_gpl : AT(ADDR(__ksymtab_unused_gpl) - LOAD_OFFSET) { \
326 VMLINUX_SYMBOL(__start___ksymtab_unused_gpl) = .; \
327 *(SORT(___ksymtab_unused_gpl+*)) \
328 VMLINUX_SYMBOL(__stop___ksymtab_unused_gpl) = .; \
331 /* Kernel symbol table: GPL-future-only symbols */ \
332 __ksymtab_gpl_future : AT(ADDR(__ksymtab_gpl_future) - LOAD_OFFSET) { \
333 VMLINUX_SYMBOL(__start___ksymtab_gpl_future) = .; \
334 *(SORT(___ksymtab_gpl_future+*)) \
335 VMLINUX_SYMBOL(__stop___ksymtab_gpl_future) = .; \
338 /* Kernel symbol table: Normal symbols */ \
339 __kcrctab : AT(ADDR(__kcrctab) - LOAD_OFFSET) { \
340 VMLINUX_SYMBOL(__start___kcrctab) = .; \
341 *(SORT(___kcrctab+*)) \
342 VMLINUX_SYMBOL(__stop___kcrctab) = .; \
345 /* Kernel symbol table: GPL-only symbols */ \
346 __kcrctab_gpl : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) { \
347 VMLINUX_SYMBOL(__start___kcrctab_gpl) = .; \
348 *(SORT(___kcrctab_gpl+*)) \
349 VMLINUX_SYMBOL(__stop___kcrctab_gpl) = .; \
352 /* Kernel symbol table: Normal unused symbols */ \
353 __kcrctab_unused : AT(ADDR(__kcrctab_unused) - LOAD_OFFSET) { \
354 VMLINUX_SYMBOL(__start___kcrctab_unused) = .; \
355 *(SORT(___kcrctab_unused+*)) \
356 VMLINUX_SYMBOL(__stop___kcrctab_unused) = .; \
359 /* Kernel symbol table: GPL-only unused symbols */ \
360 __kcrctab_unused_gpl : AT(ADDR(__kcrctab_unused_gpl) - LOAD_OFFSET) { \
361 VMLINUX_SYMBOL(__start___kcrctab_unused_gpl) = .; \
362 *(SORT(___kcrctab_unused_gpl+*)) \
363 VMLINUX_SYMBOL(__stop___kcrctab_unused_gpl) = .; \
366 /* Kernel symbol table: GPL-future-only symbols */ \
367 __kcrctab_gpl_future : AT(ADDR(__kcrctab_gpl_future) - LOAD_OFFSET) { \
368 VMLINUX_SYMBOL(__start___kcrctab_gpl_future) = .; \
369 *(SORT(___kcrctab_gpl_future+*)) \
370 VMLINUX_SYMBOL(__stop___kcrctab_gpl_future) = .; \
373 /* Kernel symbol table: strings */ \
374 __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \
375 *(__ksymtab_strings) \
378 /* __*init sections */ \
379 __init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) { \
381 DEV_KEEP(init.rodata) \
382 DEV_KEEP(exit.rodata) \
383 CPU_KEEP(init.rodata) \
384 CPU_KEEP(exit.rodata) \
385 MEM_KEEP(init.rodata) \
386 MEM_KEEP(exit.rodata) \
389 /* Built-in module parameters. */ \
390 __param : AT(ADDR(__param) - LOAD_OFFSET) { \
391 VMLINUX_SYMBOL(__start___param) = .; \
393 VMLINUX_SYMBOL(__stop___param) = .; \
396 /* Built-in module versions. */ \
397 __modver : AT(ADDR(__modver) - LOAD_OFFSET) { \
398 VMLINUX_SYMBOL(__start___modver) = .; \
400 VMLINUX_SYMBOL(__stop___modver) = .; \
401 . = ALIGN((align)); \
402 VMLINUX_SYMBOL(__end_rodata) = .; \
406 /* RODATA & RO_DATA provided for backward compatibility.
407 * All archs are supposed to use RO_DATA() */
408 #define RODATA RO_DATA_SECTION(4096)
409 #define RO_DATA(align) RO_DATA_SECTION(align)
411 #define SECURITY_INIT \
412 .security_initcall.init : AT(ADDR(.security_initcall.init) - LOAD_OFFSET) { \
413 VMLINUX_SYMBOL(__security_initcall_start) = .; \
414 *(.security_initcall.init) \
415 VMLINUX_SYMBOL(__security_initcall_end) = .; \
418 /* .text section. Map to function alignment to avoid address changes
419 * during second ld run in second ld pass when generating System.map */
425 DEV_KEEP(init.text) \
426 DEV_KEEP(exit.text) \
427 CPU_KEEP(init.text) \
428 CPU_KEEP(exit.text) \
429 MEM_KEEP(init.text) \
430 MEM_KEEP(exit.text) \
434 /* sched.text is aling to function alignment to secure we have same
435 * address even at second ld pass when generating System.map */
438 VMLINUX_SYMBOL(__sched_text_start) = .; \
440 VMLINUX_SYMBOL(__sched_text_end) = .;
442 /* spinlock.text is aling to function alignment to secure we have same
443 * address even at second ld pass when generating System.map */
446 VMLINUX_SYMBOL(__lock_text_start) = .; \
448 VMLINUX_SYMBOL(__lock_text_end) = .;
450 #define KPROBES_TEXT \
452 VMLINUX_SYMBOL(__kprobes_text_start) = .; \
454 VMLINUX_SYMBOL(__kprobes_text_end) = .;
458 VMLINUX_SYMBOL(__entry_text_start) = .; \
460 VMLINUX_SYMBOL(__entry_text_end) = .;
462 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
463 #define IRQENTRY_TEXT \
465 VMLINUX_SYMBOL(__irqentry_text_start) = .; \
467 VMLINUX_SYMBOL(__irqentry_text_end) = .;
469 #define IRQENTRY_TEXT
472 /* Section used for early init (in .S files) */
473 #define HEAD_TEXT *(.head.text)
475 #define HEAD_TEXT_SECTION \
476 .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) { \
483 #define EXCEPTION_TABLE(align) \
485 __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) { \
486 VMLINUX_SYMBOL(__start___ex_table) = .; \
488 VMLINUX_SYMBOL(__stop___ex_table) = .; \
494 #define INIT_TASK_DATA_SECTION(align) \
496 .data..init_task : AT(ADDR(.data..init_task) - LOAD_OFFSET) { \
497 INIT_TASK_DATA(align) \
500 #ifdef CONFIG_CONSTRUCTORS
501 #define KERNEL_CTORS() . = ALIGN(8); \
502 VMLINUX_SYMBOL(__ctors_start) = .; \
504 VMLINUX_SYMBOL(__ctors_end) = .;
506 #define KERNEL_CTORS()
509 /* init and exit section handling */
512 DEV_DISCARD(init.data) \
513 CPU_DISCARD(init.data) \
514 MEM_DISCARD(init.data) \
520 DEV_DISCARD(init.rodata) \
521 CPU_DISCARD(init.rodata) \
522 MEM_DISCARD(init.rodata) \
526 IRQCHIP_OF_MATCH_TABLE()
530 DEV_DISCARD(init.text) \
531 CPU_DISCARD(init.text) \
532 MEM_DISCARD(init.text)
536 DEV_DISCARD(exit.data) \
537 DEV_DISCARD(exit.rodata) \
538 CPU_DISCARD(exit.data) \
539 CPU_DISCARD(exit.rodata) \
540 MEM_DISCARD(exit.data) \
541 MEM_DISCARD(exit.rodata)
545 DEV_DISCARD(exit.text) \
546 CPU_DISCARD(exit.text) \
547 MEM_DISCARD(exit.text)
553 * bss (Block Started by Symbol) - uninitialized data
554 * zeroed during startup
556 #define SBSS(sbss_align) \
557 . = ALIGN(sbss_align); \
558 .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) { \
564 * Allow archectures to redefine BSS_FIRST_SECTIONS to add extra
565 * sections to the front of bss.
567 #ifndef BSS_FIRST_SECTIONS
568 #define BSS_FIRST_SECTIONS
571 #define BSS(bss_align) \
572 . = ALIGN(bss_align); \
573 .bss : AT(ADDR(.bss) - LOAD_OFFSET) { \
575 *(.bss..page_aligned) \
582 * DWARF debug sections.
583 * Symbols in the DWARF debugging sections are relative to
584 * the beginning of the section so we begin them at 0.
586 #define DWARF_DEBUG \
588 .debug 0 : { *(.debug) } \
589 .line 0 : { *(.line) } \
590 /* GNU DWARF 1 extensions */ \
591 .debug_srcinfo 0 : { *(.debug_srcinfo) } \
592 .debug_sfnames 0 : { *(.debug_sfnames) } \
593 /* DWARF 1.1 and DWARF 2 */ \
594 .debug_aranges 0 : { *(.debug_aranges) } \
595 .debug_pubnames 0 : { *(.debug_pubnames) } \
597 .debug_info 0 : { *(.debug_info \
598 .gnu.linkonce.wi.*) } \
599 .debug_abbrev 0 : { *(.debug_abbrev) } \
600 .debug_line 0 : { *(.debug_line) } \
601 .debug_frame 0 : { *(.debug_frame) } \
602 .debug_str 0 : { *(.debug_str) } \
603 .debug_loc 0 : { *(.debug_loc) } \
604 .debug_macinfo 0 : { *(.debug_macinfo) } \
605 /* SGI/MIPS DWARF 2 extensions */ \
606 .debug_weaknames 0 : { *(.debug_weaknames) } \
607 .debug_funcnames 0 : { *(.debug_funcnames) } \
608 .debug_typenames 0 : { *(.debug_typenames) } \
609 .debug_varnames 0 : { *(.debug_varnames) } \
611 /* Stabs debugging sections. */
612 #define STABS_DEBUG \
613 .stab 0 : { *(.stab) } \
614 .stabstr 0 : { *(.stabstr) } \
615 .stab.excl 0 : { *(.stab.excl) } \
616 .stab.exclstr 0 : { *(.stab.exclstr) } \
617 .stab.index 0 : { *(.stab.index) } \
618 .stab.indexstr 0 : { *(.stab.indexstr) } \
619 .comment 0 : { *(.comment) }
621 #ifdef CONFIG_GENERIC_BUG
624 __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) { \
625 VMLINUX_SYMBOL(__start___bug_table) = .; \
627 VMLINUX_SYMBOL(__stop___bug_table) = .; \
633 #ifdef CONFIG_PM_TRACE
636 .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) { \
637 VMLINUX_SYMBOL(__tracedata_start) = .; \
639 VMLINUX_SYMBOL(__tracedata_end) = .; \
646 .notes : AT(ADDR(.notes) - LOAD_OFFSET) { \
647 VMLINUX_SYMBOL(__start_notes) = .; \
649 VMLINUX_SYMBOL(__stop_notes) = .; \
652 #define INIT_SETUP(initsetup_align) \
653 . = ALIGN(initsetup_align); \
654 VMLINUX_SYMBOL(__setup_start) = .; \
656 VMLINUX_SYMBOL(__setup_end) = .;
658 #define INIT_CALLS_LEVEL(level) \
659 VMLINUX_SYMBOL(__initcall##level##_start) = .; \
660 *(.initcall##level##.init) \
661 *(.initcall##level##s.init) \
664 VMLINUX_SYMBOL(__initcall_start) = .; \
665 *(.initcallearly.init) \
666 INIT_CALLS_LEVEL(0) \
667 INIT_CALLS_LEVEL(1) \
668 INIT_CALLS_LEVEL(2) \
669 INIT_CALLS_LEVEL(3) \
670 INIT_CALLS_LEVEL(4) \
671 INIT_CALLS_LEVEL(5) \
672 INIT_CALLS_LEVEL(rootfs) \
673 INIT_CALLS_LEVEL(6) \
674 INIT_CALLS_LEVEL(7) \
675 VMLINUX_SYMBOL(__initcall_end) = .;
677 #define CON_INITCALL \
678 VMLINUX_SYMBOL(__con_initcall_start) = .; \
679 *(.con_initcall.init) \
680 VMLINUX_SYMBOL(__con_initcall_end) = .;
682 #define SECURITY_INITCALL \
683 VMLINUX_SYMBOL(__security_initcall_start) = .; \
684 *(.security_initcall.init) \
685 VMLINUX_SYMBOL(__security_initcall_end) = .;
687 #ifdef CONFIG_BLK_DEV_INITRD
688 #define INIT_RAM_FS \
690 VMLINUX_SYMBOL(__initramfs_start) = .; \
699 * Default discarded sections.
701 * Some archs want to discard exit text/data at runtime rather than
702 * link time due to cross-section references such as alt instructions,
703 * bug table, eh_frame, etc. DISCARDS must be the last of output
704 * section definitions so that such archs put those in earlier section
717 * PERCPU_INPUT - the percpu input sections
718 * @cacheline: cacheline size
720 * The core percpu section names and core symbols which do not rely
721 * directly upon load addresses.
723 * @cacheline is used to align subsections to avoid false cacheline
724 * sharing between subsections for different purposes.
726 #define PERCPU_INPUT(cacheline) \
727 VMLINUX_SYMBOL(__per_cpu_start) = .; \
728 *(.data..percpu..first) \
729 . = ALIGN(PAGE_SIZE); \
730 *(.data..percpu..page_aligned) \
731 . = ALIGN(cacheline); \
732 *(.data..percpu..readmostly) \
733 . = ALIGN(cacheline); \
735 *(.data..percpu..shared_aligned) \
736 VMLINUX_SYMBOL(__per_cpu_end) = .;
739 * PERCPU_VADDR - define output section for percpu area
740 * @cacheline: cacheline size
741 * @vaddr: explicit base address (optional)
742 * @phdr: destination PHDR (optional)
744 * Macro which expands to output section for percpu area.
746 * @cacheline is used to align subsections to avoid false cacheline
747 * sharing between subsections for different purposes.
749 * If @vaddr is not blank, it specifies explicit base address and all
750 * percpu symbols will be offset from the given address. If blank,
751 * @vaddr always equals @laddr + LOAD_OFFSET.
753 * @phdr defines the output PHDR to use if not blank. Be warned that
754 * output PHDR is sticky. If @phdr is specified, the next output
755 * section in the linker script will go there too. @phdr should have
758 * Note that this macros defines __per_cpu_load as an absolute symbol.
759 * If there is no need to put the percpu section at a predetermined
760 * address, use PERCPU_SECTION.
762 #define PERCPU_VADDR(cacheline, vaddr, phdr) \
763 VMLINUX_SYMBOL(__per_cpu_load) = .; \
764 .data..percpu vaddr : AT(VMLINUX_SYMBOL(__per_cpu_load) \
766 PERCPU_INPUT(cacheline) \
768 . = VMLINUX_SYMBOL(__per_cpu_load) + SIZEOF(.data..percpu);
771 * PERCPU_SECTION - define output section for percpu area, simple version
772 * @cacheline: cacheline size
774 * Align to PAGE_SIZE and outputs output section for percpu area. This
775 * macro doesn't manipulate @vaddr or @phdr and __per_cpu_load and
776 * __per_cpu_start will be identical.
778 * This macro is equivalent to ALIGN(PAGE_SIZE); PERCPU_VADDR(@cacheline,,)
779 * except that __per_cpu_load is defined as a relative symbol against
780 * .data..percpu which is required for relocatable x86_32 configuration.
782 #define PERCPU_SECTION(cacheline) \
783 . = ALIGN(PAGE_SIZE); \
784 .data..percpu : AT(ADDR(.data..percpu) - LOAD_OFFSET) { \
785 VMLINUX_SYMBOL(__per_cpu_load) = .; \
786 PERCPU_INPUT(cacheline) \
791 * Definition of the high level *_SECTION macros
792 * They will fit only a subset of the architectures
798 * All sections are combined in a single .data section.
799 * The sections following CONSTRUCTORS are arranged so their
800 * typical alignment matches.
801 * A cacheline is typical/always less than a PAGE_SIZE so
802 * the sections that has this restriction (or similar)
803 * is located before the ones requiring PAGE_SIZE alignment.
804 * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which
805 * matches the requirement of PAGE_ALIGNED_DATA.
807 * use 0 as page_align if page_aligned data is not used */
808 #define RW_DATA_SECTION(cacheline, pagealigned, inittask) \
809 . = ALIGN(PAGE_SIZE); \
810 .data : AT(ADDR(.data) - LOAD_OFFSET) { \
811 INIT_TASK_DATA(inittask) \
813 PAGE_ALIGNED_DATA(pagealigned) \
814 CACHELINE_ALIGNED_DATA(cacheline) \
815 READ_MOSTLY_DATA(cacheline) \
820 #define INIT_TEXT_SECTION(inittext_align) \
821 . = ALIGN(inittext_align); \
822 .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) { \
823 VMLINUX_SYMBOL(_sinittext) = .; \
825 VMLINUX_SYMBOL(_einittext) = .; \
828 #define INIT_DATA_SECTION(initsetup_align) \
829 .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) { \
831 INIT_SETUP(initsetup_align) \
838 #define BSS_SECTION(sbss_align, bss_align, stop_align) \
839 . = ALIGN(sbss_align); \
840 VMLINUX_SYMBOL(__bss_start) = .; \
843 . = ALIGN(stop_align); \
844 VMLINUX_SYMBOL(__bss_stop) = .;