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)
72 #define DEV_KEEP(sec) *(.dev##sec)
73 #define DEV_DISCARD(sec)
76 #define DEV_DISCARD(sec) *(.dev##sec)
79 #ifdef CONFIG_HOTPLUG_CPU
80 #define CPU_KEEP(sec) *(.cpu##sec)
81 #define CPU_DISCARD(sec)
84 #define CPU_DISCARD(sec) *(.cpu##sec)
87 #if defined(CONFIG_MEMORY_HOTPLUG)
88 #define MEM_KEEP(sec) *(.mem##sec)
89 #define MEM_DISCARD(sec)
92 #define MEM_DISCARD(sec) *(.mem##sec)
95 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
96 #define MCOUNT_REC() . = ALIGN(8); \
97 VMLINUX_SYMBOL(__start_mcount_loc) = .; \
99 VMLINUX_SYMBOL(__stop_mcount_loc) = .;
104 #ifdef CONFIG_TRACE_BRANCH_PROFILING
105 #define LIKELY_PROFILE() VMLINUX_SYMBOL(__start_annotated_branch_profile) = .; \
106 *(_ftrace_annotated_branch) \
107 VMLINUX_SYMBOL(__stop_annotated_branch_profile) = .;
109 #define LIKELY_PROFILE()
112 #ifdef CONFIG_PROFILE_ALL_BRANCHES
113 #define BRANCH_PROFILE() VMLINUX_SYMBOL(__start_branch_profile) = .; \
115 VMLINUX_SYMBOL(__stop_branch_profile) = .;
117 #define BRANCH_PROFILE()
120 #ifdef CONFIG_EVENT_TRACING
121 #define FTRACE_EVENTS() . = ALIGN(8); \
122 VMLINUX_SYMBOL(__start_ftrace_events) = .; \
124 VMLINUX_SYMBOL(__stop_ftrace_events) = .;
126 #define FTRACE_EVENTS()
129 #ifdef CONFIG_TRACING
130 #define TRACE_PRINTKS() VMLINUX_SYMBOL(__start___trace_bprintk_fmt) = .; \
131 *(__trace_printk_fmt) /* Trace_printk fmt' pointer */ \
132 VMLINUX_SYMBOL(__stop___trace_bprintk_fmt) = .;
134 #define TRACE_PRINTKS()
137 #ifdef CONFIG_FTRACE_SYSCALLS
138 #define TRACE_SYSCALLS() . = ALIGN(8); \
139 VMLINUX_SYMBOL(__start_syscalls_metadata) = .; \
140 *(__syscalls_metadata) \
141 VMLINUX_SYMBOL(__stop_syscalls_metadata) = .;
143 #define TRACE_SYSCALLS()
146 #ifdef CONFIG_CLKSRC_OF
147 #define CLKSRC_OF_TABLES() . = ALIGN(8); \
148 VMLINUX_SYMBOL(__clksrc_of_table) = .; \
149 *(__clksrc_of_table) \
150 *(__clksrc_of_table_end)
152 #define CLKSRC_OF_TABLES()
155 #ifdef CONFIG_IRQCHIP
156 #define IRQCHIP_OF_MATCH_TABLE() \
158 VMLINUX_SYMBOL(__irqchip_begin) = .; \
159 *(__irqchip_of_table) \
162 #define IRQCHIP_OF_MATCH_TABLE()
165 #ifdef CONFIG_COMMON_CLK
166 #define CLK_OF_TABLES() . = ALIGN(8); \
167 VMLINUX_SYMBOL(__clk_of_table) = .; \
169 *(__clk_of_table_end)
171 #define CLK_OF_TABLES()
174 #ifdef CONFIG_OF_RESERVED_MEM
175 #define RESERVEDMEM_OF_TABLES() \
177 VMLINUX_SYMBOL(__reservedmem_of_table) = .; \
178 *(__reservedmem_of_table) \
179 *(__reservedmem_of_table_end)
181 #define RESERVEDMEM_OF_TABLES()
184 #define KERNEL_DTB() \
186 VMLINUX_SYMBOL(__dtb_start) = .; \
187 *(.dtb.init.rodata) \
188 VMLINUX_SYMBOL(__dtb_end) = .;
194 *(.data..shared_aligned) /* percpu related */ \
195 DEV_KEEP(init.data) \
196 DEV_KEEP(exit.data) \
197 CPU_KEEP(init.data) \
198 CPU_KEEP(exit.data) \
199 MEM_KEEP(init.data) \
200 MEM_KEEP(exit.data) \
204 /* implement dynamic printk debug */ \
206 VMLINUX_SYMBOL(__start___jump_table) = .; \
208 VMLINUX_SYMBOL(__stop___jump_table) = .; \
210 VMLINUX_SYMBOL(__start___verbose) = .; \
212 VMLINUX_SYMBOL(__stop___verbose) = .; \
218 * Data section helpers
220 #define NOSAVE_DATA \
221 . = ALIGN(PAGE_SIZE); \
222 VMLINUX_SYMBOL(__nosave_begin) = .; \
224 . = ALIGN(PAGE_SIZE); \
225 VMLINUX_SYMBOL(__nosave_end) = .;
227 #define PAGE_ALIGNED_DATA(page_align) \
228 . = ALIGN(page_align); \
229 *(.data..page_aligned)
231 #define READ_MOSTLY_DATA(align) \
233 *(.data..read_mostly) \
236 #define CACHELINE_ALIGNED_DATA(align) \
238 *(.data..cacheline_aligned)
240 #define INIT_TASK_DATA(align) \
247 #define RO_DATA_SECTION(align) \
248 . = ALIGN((align)); \
249 .rodata : AT(ADDR(.rodata) - LOAD_OFFSET) { \
250 VMLINUX_SYMBOL(__start_rodata) = .; \
251 *(.rodata) *(.rodata.*) \
252 *(__vermagic) /* Kernel version magic */ \
254 VMLINUX_SYMBOL(__start___tracepoints_ptrs) = .; \
255 *(__tracepoints_ptrs) /* Tracepoints: pointer array */\
256 VMLINUX_SYMBOL(__stop___tracepoints_ptrs) = .; \
257 *(__tracepoints_strings)/* Tracepoints: strings */ \
260 .rodata1 : AT(ADDR(.rodata1) - LOAD_OFFSET) { \
267 .pci_fixup : AT(ADDR(.pci_fixup) - LOAD_OFFSET) { \
268 VMLINUX_SYMBOL(__start_pci_fixups_early) = .; \
269 *(.pci_fixup_early) \
270 VMLINUX_SYMBOL(__end_pci_fixups_early) = .; \
271 VMLINUX_SYMBOL(__start_pci_fixups_header) = .; \
272 *(.pci_fixup_header) \
273 VMLINUX_SYMBOL(__end_pci_fixups_header) = .; \
274 VMLINUX_SYMBOL(__start_pci_fixups_final) = .; \
275 *(.pci_fixup_final) \
276 VMLINUX_SYMBOL(__end_pci_fixups_final) = .; \
277 VMLINUX_SYMBOL(__start_pci_fixups_enable) = .; \
278 *(.pci_fixup_enable) \
279 VMLINUX_SYMBOL(__end_pci_fixups_enable) = .; \
280 VMLINUX_SYMBOL(__start_pci_fixups_resume) = .; \
281 *(.pci_fixup_resume) \
282 VMLINUX_SYMBOL(__end_pci_fixups_resume) = .; \
283 VMLINUX_SYMBOL(__start_pci_fixups_resume_early) = .; \
284 *(.pci_fixup_resume_early) \
285 VMLINUX_SYMBOL(__end_pci_fixups_resume_early) = .; \
286 VMLINUX_SYMBOL(__start_pci_fixups_suspend) = .; \
287 *(.pci_fixup_suspend) \
288 VMLINUX_SYMBOL(__end_pci_fixups_suspend) = .; \
291 /* Built-in firmware blobs */ \
292 .builtin_fw : AT(ADDR(.builtin_fw) - LOAD_OFFSET) { \
293 VMLINUX_SYMBOL(__start_builtin_fw) = .; \
295 VMLINUX_SYMBOL(__end_builtin_fw) = .; \
298 /* RapidIO route ops */ \
299 .rio_ops : AT(ADDR(.rio_ops) - LOAD_OFFSET) { \
300 VMLINUX_SYMBOL(__start_rio_switch_ops) = .; \
302 VMLINUX_SYMBOL(__end_rio_switch_ops) = .; \
307 /* Kernel symbol table: Normal symbols */ \
308 __ksymtab : AT(ADDR(__ksymtab) - LOAD_OFFSET) { \
309 VMLINUX_SYMBOL(__start___ksymtab) = .; \
310 *(SORT(___ksymtab+*)) \
311 VMLINUX_SYMBOL(__stop___ksymtab) = .; \
314 /* Kernel symbol table: GPL-only symbols */ \
315 __ksymtab_gpl : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) { \
316 VMLINUX_SYMBOL(__start___ksymtab_gpl) = .; \
317 *(SORT(___ksymtab_gpl+*)) \
318 VMLINUX_SYMBOL(__stop___ksymtab_gpl) = .; \
321 /* Kernel symbol table: Normal unused symbols */ \
322 __ksymtab_unused : AT(ADDR(__ksymtab_unused) - LOAD_OFFSET) { \
323 VMLINUX_SYMBOL(__start___ksymtab_unused) = .; \
324 *(SORT(___ksymtab_unused+*)) \
325 VMLINUX_SYMBOL(__stop___ksymtab_unused) = .; \
328 /* Kernel symbol table: GPL-only unused symbols */ \
329 __ksymtab_unused_gpl : AT(ADDR(__ksymtab_unused_gpl) - LOAD_OFFSET) { \
330 VMLINUX_SYMBOL(__start___ksymtab_unused_gpl) = .; \
331 *(SORT(___ksymtab_unused_gpl+*)) \
332 VMLINUX_SYMBOL(__stop___ksymtab_unused_gpl) = .; \
335 /* Kernel symbol table: GPL-future-only symbols */ \
336 __ksymtab_gpl_future : AT(ADDR(__ksymtab_gpl_future) - LOAD_OFFSET) { \
337 VMLINUX_SYMBOL(__start___ksymtab_gpl_future) = .; \
338 *(SORT(___ksymtab_gpl_future+*)) \
339 VMLINUX_SYMBOL(__stop___ksymtab_gpl_future) = .; \
342 /* Kernel symbol table: Normal symbols */ \
343 __kcrctab : AT(ADDR(__kcrctab) - LOAD_OFFSET) { \
344 VMLINUX_SYMBOL(__start___kcrctab) = .; \
345 *(SORT(___kcrctab+*)) \
346 VMLINUX_SYMBOL(__stop___kcrctab) = .; \
349 /* Kernel symbol table: GPL-only symbols */ \
350 __kcrctab_gpl : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) { \
351 VMLINUX_SYMBOL(__start___kcrctab_gpl) = .; \
352 *(SORT(___kcrctab_gpl+*)) \
353 VMLINUX_SYMBOL(__stop___kcrctab_gpl) = .; \
356 /* Kernel symbol table: Normal unused symbols */ \
357 __kcrctab_unused : AT(ADDR(__kcrctab_unused) - LOAD_OFFSET) { \
358 VMLINUX_SYMBOL(__start___kcrctab_unused) = .; \
359 *(SORT(___kcrctab_unused+*)) \
360 VMLINUX_SYMBOL(__stop___kcrctab_unused) = .; \
363 /* Kernel symbol table: GPL-only unused symbols */ \
364 __kcrctab_unused_gpl : AT(ADDR(__kcrctab_unused_gpl) - LOAD_OFFSET) { \
365 VMLINUX_SYMBOL(__start___kcrctab_unused_gpl) = .; \
366 *(SORT(___kcrctab_unused_gpl+*)) \
367 VMLINUX_SYMBOL(__stop___kcrctab_unused_gpl) = .; \
370 /* Kernel symbol table: GPL-future-only symbols */ \
371 __kcrctab_gpl_future : AT(ADDR(__kcrctab_gpl_future) - LOAD_OFFSET) { \
372 VMLINUX_SYMBOL(__start___kcrctab_gpl_future) = .; \
373 *(SORT(___kcrctab_gpl_future+*)) \
374 VMLINUX_SYMBOL(__stop___kcrctab_gpl_future) = .; \
377 /* Kernel symbol table: strings */ \
378 __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \
379 *(__ksymtab_strings) \
382 /* __*init sections */ \
383 __init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) { \
385 DEV_KEEP(init.rodata) \
386 DEV_KEEP(exit.rodata) \
387 CPU_KEEP(init.rodata) \
388 CPU_KEEP(exit.rodata) \
389 MEM_KEEP(init.rodata) \
390 MEM_KEEP(exit.rodata) \
393 /* Built-in module parameters. */ \
394 __param : AT(ADDR(__param) - LOAD_OFFSET) { \
395 VMLINUX_SYMBOL(__start___param) = .; \
397 VMLINUX_SYMBOL(__stop___param) = .; \
400 /* Built-in module versions. */ \
401 __modver : AT(ADDR(__modver) - LOAD_OFFSET) { \
402 VMLINUX_SYMBOL(__start___modver) = .; \
404 VMLINUX_SYMBOL(__stop___modver) = .; \
405 . = ALIGN((align)); \
406 VMLINUX_SYMBOL(__end_rodata) = .; \
410 /* RODATA & RO_DATA provided for backward compatibility.
411 * All archs are supposed to use RO_DATA() */
412 #define RODATA RO_DATA_SECTION(4096)
413 #define RO_DATA(align) RO_DATA_SECTION(align)
415 #define SECURITY_INIT \
416 .security_initcall.init : AT(ADDR(.security_initcall.init) - LOAD_OFFSET) { \
417 VMLINUX_SYMBOL(__security_initcall_start) = .; \
418 *(.security_initcall.init) \
419 VMLINUX_SYMBOL(__security_initcall_end) = .; \
422 /* .text section. Map to function alignment to avoid address changes
423 * during second ld run in second ld pass when generating System.map */
429 DEV_KEEP(init.text) \
430 DEV_KEEP(exit.text) \
431 CPU_KEEP(init.text) \
432 CPU_KEEP(exit.text) \
433 MEM_KEEP(init.text) \
434 MEM_KEEP(exit.text) \
438 /* sched.text is aling to function alignment to secure we have same
439 * address even at second ld pass when generating System.map */
442 VMLINUX_SYMBOL(__sched_text_start) = .; \
444 VMLINUX_SYMBOL(__sched_text_end) = .;
446 /* spinlock.text is aling to function alignment to secure we have same
447 * address even at second ld pass when generating System.map */
450 VMLINUX_SYMBOL(__lock_text_start) = .; \
452 VMLINUX_SYMBOL(__lock_text_end) = .;
454 #define KPROBES_TEXT \
456 VMLINUX_SYMBOL(__kprobes_text_start) = .; \
458 VMLINUX_SYMBOL(__kprobes_text_end) = .;
462 VMLINUX_SYMBOL(__entry_text_start) = .; \
464 VMLINUX_SYMBOL(__entry_text_end) = .;
466 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
467 #define IRQENTRY_TEXT \
469 VMLINUX_SYMBOL(__irqentry_text_start) = .; \
471 VMLINUX_SYMBOL(__irqentry_text_end) = .;
473 #define IRQENTRY_TEXT
476 /* Section used for early init (in .S files) */
477 #define HEAD_TEXT *(.head.text)
479 #define HEAD_TEXT_SECTION \
480 .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) { \
487 #define EXCEPTION_TABLE(align) \
489 __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) { \
490 VMLINUX_SYMBOL(__start___ex_table) = .; \
492 VMLINUX_SYMBOL(__stop___ex_table) = .; \
498 #define INIT_TASK_DATA_SECTION(align) \
500 .data..init_task : AT(ADDR(.data..init_task) - LOAD_OFFSET) { \
501 INIT_TASK_DATA(align) \
504 #ifdef CONFIG_CONSTRUCTORS
505 #define KERNEL_CTORS() . = ALIGN(8); \
506 VMLINUX_SYMBOL(__ctors_start) = .; \
508 VMLINUX_SYMBOL(__ctors_end) = .;
510 #define KERNEL_CTORS()
513 /* init and exit section handling */
516 DEV_DISCARD(init.data) \
517 CPU_DISCARD(init.data) \
518 MEM_DISCARD(init.data) \
524 DEV_DISCARD(init.rodata) \
525 CPU_DISCARD(init.rodata) \
526 MEM_DISCARD(init.rodata) \
528 RESERVEDMEM_OF_TABLES() \
531 IRQCHIP_OF_MATCH_TABLE()
535 DEV_DISCARD(init.text) \
536 CPU_DISCARD(init.text) \
537 MEM_DISCARD(init.text)
541 DEV_DISCARD(exit.data) \
542 DEV_DISCARD(exit.rodata) \
543 CPU_DISCARD(exit.data) \
544 CPU_DISCARD(exit.rodata) \
545 MEM_DISCARD(exit.data) \
546 MEM_DISCARD(exit.rodata)
550 DEV_DISCARD(exit.text) \
551 CPU_DISCARD(exit.text) \
552 MEM_DISCARD(exit.text)
558 * bss (Block Started by Symbol) - uninitialized data
559 * zeroed during startup
561 #define SBSS(sbss_align) \
562 . = ALIGN(sbss_align); \
563 .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) { \
569 * Allow archectures to redefine BSS_FIRST_SECTIONS to add extra
570 * sections to the front of bss.
572 #ifndef BSS_FIRST_SECTIONS
573 #define BSS_FIRST_SECTIONS
576 #define BSS(bss_align) \
577 . = ALIGN(bss_align); \
578 .bss : AT(ADDR(.bss) - LOAD_OFFSET) { \
580 *(.bss..page_aligned) \
587 * DWARF debug sections.
588 * Symbols in the DWARF debugging sections are relative to
589 * the beginning of the section so we begin them at 0.
591 #define DWARF_DEBUG \
593 .debug 0 : { *(.debug) } \
594 .line 0 : { *(.line) } \
595 /* GNU DWARF 1 extensions */ \
596 .debug_srcinfo 0 : { *(.debug_srcinfo) } \
597 .debug_sfnames 0 : { *(.debug_sfnames) } \
598 /* DWARF 1.1 and DWARF 2 */ \
599 .debug_aranges 0 : { *(.debug_aranges) } \
600 .debug_pubnames 0 : { *(.debug_pubnames) } \
602 .debug_info 0 : { *(.debug_info \
603 .gnu.linkonce.wi.*) } \
604 .debug_abbrev 0 : { *(.debug_abbrev) } \
605 .debug_line 0 : { *(.debug_line) } \
606 .debug_frame 0 : { *(.debug_frame) } \
607 .debug_str 0 : { *(.debug_str) } \
608 .debug_loc 0 : { *(.debug_loc) } \
609 .debug_macinfo 0 : { *(.debug_macinfo) } \
610 /* SGI/MIPS DWARF 2 extensions */ \
611 .debug_weaknames 0 : { *(.debug_weaknames) } \
612 .debug_funcnames 0 : { *(.debug_funcnames) } \
613 .debug_typenames 0 : { *(.debug_typenames) } \
614 .debug_varnames 0 : { *(.debug_varnames) } \
616 /* Stabs debugging sections. */
617 #define STABS_DEBUG \
618 .stab 0 : { *(.stab) } \
619 .stabstr 0 : { *(.stabstr) } \
620 .stab.excl 0 : { *(.stab.excl) } \
621 .stab.exclstr 0 : { *(.stab.exclstr) } \
622 .stab.index 0 : { *(.stab.index) } \
623 .stab.indexstr 0 : { *(.stab.indexstr) } \
624 .comment 0 : { *(.comment) }
626 #ifdef CONFIG_GENERIC_BUG
629 __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) { \
630 VMLINUX_SYMBOL(__start___bug_table) = .; \
632 VMLINUX_SYMBOL(__stop___bug_table) = .; \
638 #ifdef CONFIG_PM_TRACE
641 .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) { \
642 VMLINUX_SYMBOL(__tracedata_start) = .; \
644 VMLINUX_SYMBOL(__tracedata_end) = .; \
651 .notes : AT(ADDR(.notes) - LOAD_OFFSET) { \
652 VMLINUX_SYMBOL(__start_notes) = .; \
654 VMLINUX_SYMBOL(__stop_notes) = .; \
657 #define INIT_SETUP(initsetup_align) \
658 . = ALIGN(initsetup_align); \
659 VMLINUX_SYMBOL(__setup_start) = .; \
661 VMLINUX_SYMBOL(__setup_end) = .;
663 #define INIT_CALLS_LEVEL(level) \
664 VMLINUX_SYMBOL(__initcall##level##_start) = .; \
665 *(.initcall##level##.init) \
666 *(.initcall##level##s.init) \
669 VMLINUX_SYMBOL(__initcall_start) = .; \
670 *(.initcallearly.init) \
671 INIT_CALLS_LEVEL(0) \
672 INIT_CALLS_LEVEL(1) \
673 INIT_CALLS_LEVEL(2) \
674 INIT_CALLS_LEVEL(3) \
675 INIT_CALLS_LEVEL(4) \
676 INIT_CALLS_LEVEL(5) \
677 INIT_CALLS_LEVEL(rootfs) \
678 INIT_CALLS_LEVEL(6) \
679 INIT_CALLS_LEVEL(7) \
680 VMLINUX_SYMBOL(__initcall_end) = .;
682 #define CON_INITCALL \
683 VMLINUX_SYMBOL(__con_initcall_start) = .; \
684 *(.con_initcall.init) \
685 VMLINUX_SYMBOL(__con_initcall_end) = .;
687 #define SECURITY_INITCALL \
688 VMLINUX_SYMBOL(__security_initcall_start) = .; \
689 *(.security_initcall.init) \
690 VMLINUX_SYMBOL(__security_initcall_end) = .;
692 #ifdef CONFIG_BLK_DEV_INITRD
693 #define INIT_RAM_FS \
695 VMLINUX_SYMBOL(__initramfs_start) = .; \
704 * Default discarded sections.
706 * Some archs want to discard exit text/data at runtime rather than
707 * link time due to cross-section references such as alt instructions,
708 * bug table, eh_frame, etc. DISCARDS must be the last of output
709 * section definitions so that such archs put those in earlier section
722 * PERCPU_INPUT - the percpu input sections
723 * @cacheline: cacheline size
725 * The core percpu section names and core symbols which do not rely
726 * directly upon load addresses.
728 * @cacheline is used to align subsections to avoid false cacheline
729 * sharing between subsections for different purposes.
731 #define PERCPU_INPUT(cacheline) \
732 VMLINUX_SYMBOL(__per_cpu_start) = .; \
733 *(.data..percpu..first) \
734 . = ALIGN(PAGE_SIZE); \
735 *(.data..percpu..page_aligned) \
736 . = ALIGN(cacheline); \
737 *(.data..percpu..readmostly) \
738 . = ALIGN(cacheline); \
740 *(.data..percpu..shared_aligned) \
741 VMLINUX_SYMBOL(__per_cpu_end) = .;
744 * PERCPU_VADDR - define output section for percpu area
745 * @cacheline: cacheline size
746 * @vaddr: explicit base address (optional)
747 * @phdr: destination PHDR (optional)
749 * Macro which expands to output section for percpu area.
751 * @cacheline is used to align subsections to avoid false cacheline
752 * sharing between subsections for different purposes.
754 * If @vaddr is not blank, it specifies explicit base address and all
755 * percpu symbols will be offset from the given address. If blank,
756 * @vaddr always equals @laddr + LOAD_OFFSET.
758 * @phdr defines the output PHDR to use if not blank. Be warned that
759 * output PHDR is sticky. If @phdr is specified, the next output
760 * section in the linker script will go there too. @phdr should have
763 * Note that this macros defines __per_cpu_load as an absolute symbol.
764 * If there is no need to put the percpu section at a predetermined
765 * address, use PERCPU_SECTION.
767 #define PERCPU_VADDR(cacheline, vaddr, phdr) \
768 VMLINUX_SYMBOL(__per_cpu_load) = .; \
769 .data..percpu vaddr : AT(VMLINUX_SYMBOL(__per_cpu_load) \
771 PERCPU_INPUT(cacheline) \
773 . = VMLINUX_SYMBOL(__per_cpu_load) + SIZEOF(.data..percpu);
776 * PERCPU_SECTION - define output section for percpu area, simple version
777 * @cacheline: cacheline size
779 * Align to PAGE_SIZE and outputs output section for percpu area. This
780 * macro doesn't manipulate @vaddr or @phdr and __per_cpu_load and
781 * __per_cpu_start will be identical.
783 * This macro is equivalent to ALIGN(PAGE_SIZE); PERCPU_VADDR(@cacheline,,)
784 * except that __per_cpu_load is defined as a relative symbol against
785 * .data..percpu which is required for relocatable x86_32 configuration.
787 #define PERCPU_SECTION(cacheline) \
788 . = ALIGN(PAGE_SIZE); \
789 .data..percpu : AT(ADDR(.data..percpu) - LOAD_OFFSET) { \
790 VMLINUX_SYMBOL(__per_cpu_load) = .; \
791 PERCPU_INPUT(cacheline) \
796 * Definition of the high level *_SECTION macros
797 * They will fit only a subset of the architectures
803 * All sections are combined in a single .data section.
804 * The sections following CONSTRUCTORS are arranged so their
805 * typical alignment matches.
806 * A cacheline is typical/always less than a PAGE_SIZE so
807 * the sections that has this restriction (or similar)
808 * is located before the ones requiring PAGE_SIZE alignment.
809 * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which
810 * matches the requirement of PAGE_ALIGNED_DATA.
812 * use 0 as page_align if page_aligned data is not used */
813 #define RW_DATA_SECTION(cacheline, pagealigned, inittask) \
814 . = ALIGN(PAGE_SIZE); \
815 .data : AT(ADDR(.data) - LOAD_OFFSET) { \
816 INIT_TASK_DATA(inittask) \
818 PAGE_ALIGNED_DATA(pagealigned) \
819 CACHELINE_ALIGNED_DATA(cacheline) \
820 READ_MOSTLY_DATA(cacheline) \
825 #define INIT_TEXT_SECTION(inittext_align) \
826 . = ALIGN(inittext_align); \
827 .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) { \
828 VMLINUX_SYMBOL(_sinittext) = .; \
830 VMLINUX_SYMBOL(_einittext) = .; \
833 #define INIT_DATA_SECTION(initsetup_align) \
834 .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) { \
836 INIT_SETUP(initsetup_align) \
843 #define BSS_SECTION(sbss_align, bss_align, stop_align) \
844 . = ALIGN(sbss_align); \
845 VMLINUX_SYMBOL(__bss_start) = .; \
848 . = ALIGN(stop_align); \
849 VMLINUX_SYMBOL(__bss_stop) = .;