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()
153 #define KERNEL_DTB() \
155 VMLINUX_SYMBOL(__dtb_start) = .; \
156 *(.dtb.init.rodata) \
157 VMLINUX_SYMBOL(__dtb_end) = .;
163 *(.data..shared_aligned) /* percpu related */ \
164 DEV_KEEP(init.data) \
165 DEV_KEEP(exit.data) \
166 CPU_KEEP(init.data) \
167 CPU_KEEP(exit.data) \
168 MEM_KEEP(init.data) \
169 MEM_KEEP(exit.data) \
173 /* implement dynamic printk debug */ \
175 VMLINUX_SYMBOL(__start___jump_table) = .; \
177 VMLINUX_SYMBOL(__stop___jump_table) = .; \
179 VMLINUX_SYMBOL(__start___verbose) = .; \
181 VMLINUX_SYMBOL(__stop___verbose) = .; \
187 * Data section helpers
189 #define NOSAVE_DATA \
190 . = ALIGN(PAGE_SIZE); \
191 VMLINUX_SYMBOL(__nosave_begin) = .; \
193 . = ALIGN(PAGE_SIZE); \
194 VMLINUX_SYMBOL(__nosave_end) = .;
196 #define PAGE_ALIGNED_DATA(page_align) \
197 . = ALIGN(page_align); \
198 *(.data..page_aligned)
200 #define READ_MOSTLY_DATA(align) \
202 *(.data..read_mostly) \
205 #define CACHELINE_ALIGNED_DATA(align) \
207 *(.data..cacheline_aligned)
209 #define INIT_TASK_DATA(align) \
216 #define RO_DATA_SECTION(align) \
217 . = ALIGN((align)); \
218 .rodata : AT(ADDR(.rodata) - LOAD_OFFSET) { \
219 VMLINUX_SYMBOL(__start_rodata) = .; \
220 *(.rodata) *(.rodata.*) \
221 *(__vermagic) /* Kernel version magic */ \
223 VMLINUX_SYMBOL(__start___tracepoints_ptrs) = .; \
224 *(__tracepoints_ptrs) /* Tracepoints: pointer array */\
225 VMLINUX_SYMBOL(__stop___tracepoints_ptrs) = .; \
226 *(__tracepoints_strings)/* Tracepoints: strings */ \
229 .rodata1 : AT(ADDR(.rodata1) - LOAD_OFFSET) { \
236 .pci_fixup : AT(ADDR(.pci_fixup) - LOAD_OFFSET) { \
237 VMLINUX_SYMBOL(__start_pci_fixups_early) = .; \
238 *(.pci_fixup_early) \
239 VMLINUX_SYMBOL(__end_pci_fixups_early) = .; \
240 VMLINUX_SYMBOL(__start_pci_fixups_header) = .; \
241 *(.pci_fixup_header) \
242 VMLINUX_SYMBOL(__end_pci_fixups_header) = .; \
243 VMLINUX_SYMBOL(__start_pci_fixups_final) = .; \
244 *(.pci_fixup_final) \
245 VMLINUX_SYMBOL(__end_pci_fixups_final) = .; \
246 VMLINUX_SYMBOL(__start_pci_fixups_enable) = .; \
247 *(.pci_fixup_enable) \
248 VMLINUX_SYMBOL(__end_pci_fixups_enable) = .; \
249 VMLINUX_SYMBOL(__start_pci_fixups_resume) = .; \
250 *(.pci_fixup_resume) \
251 VMLINUX_SYMBOL(__end_pci_fixups_resume) = .; \
252 VMLINUX_SYMBOL(__start_pci_fixups_resume_early) = .; \
253 *(.pci_fixup_resume_early) \
254 VMLINUX_SYMBOL(__end_pci_fixups_resume_early) = .; \
255 VMLINUX_SYMBOL(__start_pci_fixups_suspend) = .; \
256 *(.pci_fixup_suspend) \
257 VMLINUX_SYMBOL(__end_pci_fixups_suspend) = .; \
260 /* Built-in firmware blobs */ \
261 .builtin_fw : AT(ADDR(.builtin_fw) - LOAD_OFFSET) { \
262 VMLINUX_SYMBOL(__start_builtin_fw) = .; \
264 VMLINUX_SYMBOL(__end_builtin_fw) = .; \
267 /* RapidIO route ops */ \
268 .rio_ops : AT(ADDR(.rio_ops) - LOAD_OFFSET) { \
269 VMLINUX_SYMBOL(__start_rio_switch_ops) = .; \
271 VMLINUX_SYMBOL(__end_rio_switch_ops) = .; \
276 /* Kernel symbol table: Normal symbols */ \
277 __ksymtab : AT(ADDR(__ksymtab) - LOAD_OFFSET) { \
278 VMLINUX_SYMBOL(__start___ksymtab) = .; \
279 *(SORT(___ksymtab+*)) \
280 VMLINUX_SYMBOL(__stop___ksymtab) = .; \
283 /* Kernel symbol table: GPL-only symbols */ \
284 __ksymtab_gpl : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) { \
285 VMLINUX_SYMBOL(__start___ksymtab_gpl) = .; \
286 *(SORT(___ksymtab_gpl+*)) \
287 VMLINUX_SYMBOL(__stop___ksymtab_gpl) = .; \
290 /* Kernel symbol table: Normal unused symbols */ \
291 __ksymtab_unused : AT(ADDR(__ksymtab_unused) - LOAD_OFFSET) { \
292 VMLINUX_SYMBOL(__start___ksymtab_unused) = .; \
293 *(SORT(___ksymtab_unused+*)) \
294 VMLINUX_SYMBOL(__stop___ksymtab_unused) = .; \
297 /* Kernel symbol table: GPL-only unused symbols */ \
298 __ksymtab_unused_gpl : AT(ADDR(__ksymtab_unused_gpl) - LOAD_OFFSET) { \
299 VMLINUX_SYMBOL(__start___ksymtab_unused_gpl) = .; \
300 *(SORT(___ksymtab_unused_gpl+*)) \
301 VMLINUX_SYMBOL(__stop___ksymtab_unused_gpl) = .; \
304 /* Kernel symbol table: GPL-future-only symbols */ \
305 __ksymtab_gpl_future : AT(ADDR(__ksymtab_gpl_future) - LOAD_OFFSET) { \
306 VMLINUX_SYMBOL(__start___ksymtab_gpl_future) = .; \
307 *(SORT(___ksymtab_gpl_future+*)) \
308 VMLINUX_SYMBOL(__stop___ksymtab_gpl_future) = .; \
311 /* Kernel symbol table: Normal symbols */ \
312 __kcrctab : AT(ADDR(__kcrctab) - LOAD_OFFSET) { \
313 VMLINUX_SYMBOL(__start___kcrctab) = .; \
314 *(SORT(___kcrctab+*)) \
315 VMLINUX_SYMBOL(__stop___kcrctab) = .; \
318 /* Kernel symbol table: GPL-only symbols */ \
319 __kcrctab_gpl : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) { \
320 VMLINUX_SYMBOL(__start___kcrctab_gpl) = .; \
321 *(SORT(___kcrctab_gpl+*)) \
322 VMLINUX_SYMBOL(__stop___kcrctab_gpl) = .; \
325 /* Kernel symbol table: Normal unused symbols */ \
326 __kcrctab_unused : AT(ADDR(__kcrctab_unused) - LOAD_OFFSET) { \
327 VMLINUX_SYMBOL(__start___kcrctab_unused) = .; \
328 *(SORT(___kcrctab_unused+*)) \
329 VMLINUX_SYMBOL(__stop___kcrctab_unused) = .; \
332 /* Kernel symbol table: GPL-only unused symbols */ \
333 __kcrctab_unused_gpl : AT(ADDR(__kcrctab_unused_gpl) - LOAD_OFFSET) { \
334 VMLINUX_SYMBOL(__start___kcrctab_unused_gpl) = .; \
335 *(SORT(___kcrctab_unused_gpl+*)) \
336 VMLINUX_SYMBOL(__stop___kcrctab_unused_gpl) = .; \
339 /* Kernel symbol table: GPL-future-only symbols */ \
340 __kcrctab_gpl_future : AT(ADDR(__kcrctab_gpl_future) - LOAD_OFFSET) { \
341 VMLINUX_SYMBOL(__start___kcrctab_gpl_future) = .; \
342 *(SORT(___kcrctab_gpl_future+*)) \
343 VMLINUX_SYMBOL(__stop___kcrctab_gpl_future) = .; \
346 /* Kernel symbol table: strings */ \
347 __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \
348 *(__ksymtab_strings) \
351 /* __*init sections */ \
352 __init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) { \
354 DEV_KEEP(init.rodata) \
355 DEV_KEEP(exit.rodata) \
356 CPU_KEEP(init.rodata) \
357 CPU_KEEP(exit.rodata) \
358 MEM_KEEP(init.rodata) \
359 MEM_KEEP(exit.rodata) \
364 /* Built-in module parameters. */ \
365 __param : AT(ADDR(__param) - LOAD_OFFSET) { \
366 VMLINUX_SYMBOL(__start___param) = .; \
368 VMLINUX_SYMBOL(__stop___param) = .; \
371 /* Built-in module versions. */ \
372 __modver : AT(ADDR(__modver) - LOAD_OFFSET) { \
373 VMLINUX_SYMBOL(__start___modver) = .; \
375 VMLINUX_SYMBOL(__stop___modver) = .; \
376 . = ALIGN((align)); \
377 VMLINUX_SYMBOL(__end_rodata) = .; \
381 /* RODATA & RO_DATA provided for backward compatibility.
382 * All archs are supposed to use RO_DATA() */
383 #define RODATA RO_DATA_SECTION(4096)
384 #define RO_DATA(align) RO_DATA_SECTION(align)
386 #define SECURITY_INIT \
387 .security_initcall.init : AT(ADDR(.security_initcall.init) - LOAD_OFFSET) { \
388 VMLINUX_SYMBOL(__security_initcall_start) = .; \
389 *(.security_initcall.init) \
390 VMLINUX_SYMBOL(__security_initcall_end) = .; \
393 /* .text section. Map to function alignment to avoid address changes
394 * during second ld run in second ld pass when generating System.map */
400 DEV_KEEP(init.text) \
401 DEV_KEEP(exit.text) \
402 CPU_KEEP(init.text) \
403 CPU_KEEP(exit.text) \
404 MEM_KEEP(init.text) \
405 MEM_KEEP(exit.text) \
409 /* sched.text is aling to function alignment to secure we have same
410 * address even at second ld pass when generating System.map */
413 VMLINUX_SYMBOL(__sched_text_start) = .; \
415 VMLINUX_SYMBOL(__sched_text_end) = .;
417 /* spinlock.text is aling to function alignment to secure we have same
418 * address even at second ld pass when generating System.map */
421 VMLINUX_SYMBOL(__lock_text_start) = .; \
423 VMLINUX_SYMBOL(__lock_text_end) = .;
425 #define KPROBES_TEXT \
427 VMLINUX_SYMBOL(__kprobes_text_start) = .; \
429 VMLINUX_SYMBOL(__kprobes_text_end) = .;
433 VMLINUX_SYMBOL(__entry_text_start) = .; \
435 VMLINUX_SYMBOL(__entry_text_end) = .;
437 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
438 #define IRQENTRY_TEXT \
440 VMLINUX_SYMBOL(__irqentry_text_start) = .; \
442 VMLINUX_SYMBOL(__irqentry_text_end) = .;
444 #define IRQENTRY_TEXT
447 /* Section used for early init (in .S files) */
448 #define HEAD_TEXT *(.head.text)
450 #define HEAD_TEXT_SECTION \
451 .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) { \
458 #define EXCEPTION_TABLE(align) \
460 __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) { \
461 VMLINUX_SYMBOL(__start___ex_table) = .; \
463 VMLINUX_SYMBOL(__stop___ex_table) = .; \
469 #define INIT_TASK_DATA_SECTION(align) \
471 .data..init_task : AT(ADDR(.data..init_task) - LOAD_OFFSET) { \
472 INIT_TASK_DATA(align) \
475 #ifdef CONFIG_CONSTRUCTORS
476 #define KERNEL_CTORS() . = ALIGN(8); \
477 VMLINUX_SYMBOL(__ctors_start) = .; \
479 VMLINUX_SYMBOL(__ctors_end) = .;
481 #define KERNEL_CTORS()
484 /* init and exit section handling */
487 DEV_DISCARD(init.data) \
488 CPU_DISCARD(init.data) \
489 MEM_DISCARD(init.data) \
495 DEV_DISCARD(init.rodata) \
496 CPU_DISCARD(init.rodata) \
497 MEM_DISCARD(init.rodata) \
502 DEV_DISCARD(init.text) \
503 CPU_DISCARD(init.text) \
504 MEM_DISCARD(init.text)
508 DEV_DISCARD(exit.data) \
509 DEV_DISCARD(exit.rodata) \
510 CPU_DISCARD(exit.data) \
511 CPU_DISCARD(exit.rodata) \
512 MEM_DISCARD(exit.data) \
513 MEM_DISCARD(exit.rodata)
517 DEV_DISCARD(exit.text) \
518 CPU_DISCARD(exit.text) \
519 MEM_DISCARD(exit.text)
525 * bss (Block Started by Symbol) - uninitialized data
526 * zeroed during startup
528 #define SBSS(sbss_align) \
529 . = ALIGN(sbss_align); \
530 .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) { \
535 #define BSS(bss_align) \
536 . = ALIGN(bss_align); \
537 .bss : AT(ADDR(.bss) - LOAD_OFFSET) { \
538 *(.bss..page_aligned) \
545 * DWARF debug sections.
546 * Symbols in the DWARF debugging sections are relative to
547 * the beginning of the section so we begin them at 0.
549 #define DWARF_DEBUG \
551 .debug 0 : { *(.debug) } \
552 .line 0 : { *(.line) } \
553 /* GNU DWARF 1 extensions */ \
554 .debug_srcinfo 0 : { *(.debug_srcinfo) } \
555 .debug_sfnames 0 : { *(.debug_sfnames) } \
556 /* DWARF 1.1 and DWARF 2 */ \
557 .debug_aranges 0 : { *(.debug_aranges) } \
558 .debug_pubnames 0 : { *(.debug_pubnames) } \
560 .debug_info 0 : { *(.debug_info \
561 .gnu.linkonce.wi.*) } \
562 .debug_abbrev 0 : { *(.debug_abbrev) } \
563 .debug_line 0 : { *(.debug_line) } \
564 .debug_frame 0 : { *(.debug_frame) } \
565 .debug_str 0 : { *(.debug_str) } \
566 .debug_loc 0 : { *(.debug_loc) } \
567 .debug_macinfo 0 : { *(.debug_macinfo) } \
568 /* SGI/MIPS DWARF 2 extensions */ \
569 .debug_weaknames 0 : { *(.debug_weaknames) } \
570 .debug_funcnames 0 : { *(.debug_funcnames) } \
571 .debug_typenames 0 : { *(.debug_typenames) } \
572 .debug_varnames 0 : { *(.debug_varnames) } \
574 /* Stabs debugging sections. */
575 #define STABS_DEBUG \
576 .stab 0 : { *(.stab) } \
577 .stabstr 0 : { *(.stabstr) } \
578 .stab.excl 0 : { *(.stab.excl) } \
579 .stab.exclstr 0 : { *(.stab.exclstr) } \
580 .stab.index 0 : { *(.stab.index) } \
581 .stab.indexstr 0 : { *(.stab.indexstr) } \
582 .comment 0 : { *(.comment) }
584 #ifdef CONFIG_GENERIC_BUG
587 __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) { \
588 VMLINUX_SYMBOL(__start___bug_table) = .; \
590 VMLINUX_SYMBOL(__stop___bug_table) = .; \
596 #ifdef CONFIG_PM_TRACE
599 .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) { \
600 VMLINUX_SYMBOL(__tracedata_start) = .; \
602 VMLINUX_SYMBOL(__tracedata_end) = .; \
609 .notes : AT(ADDR(.notes) - LOAD_OFFSET) { \
610 VMLINUX_SYMBOL(__start_notes) = .; \
612 VMLINUX_SYMBOL(__stop_notes) = .; \
615 #define INIT_SETUP(initsetup_align) \
616 . = ALIGN(initsetup_align); \
617 VMLINUX_SYMBOL(__setup_start) = .; \
619 VMLINUX_SYMBOL(__setup_end) = .;
621 #define INIT_CALLS_LEVEL(level) \
622 VMLINUX_SYMBOL(__initcall##level##_start) = .; \
623 *(.initcall##level##.init) \
624 *(.initcall##level##s.init) \
627 VMLINUX_SYMBOL(__initcall_start) = .; \
628 *(.initcallearly.init) \
629 INIT_CALLS_LEVEL(0) \
630 INIT_CALLS_LEVEL(1) \
631 INIT_CALLS_LEVEL(2) \
632 INIT_CALLS_LEVEL(3) \
633 INIT_CALLS_LEVEL(4) \
634 INIT_CALLS_LEVEL(5) \
635 INIT_CALLS_LEVEL(rootfs) \
636 INIT_CALLS_LEVEL(6) \
637 INIT_CALLS_LEVEL(7) \
638 VMLINUX_SYMBOL(__initcall_end) = .;
640 #define CON_INITCALL \
641 VMLINUX_SYMBOL(__con_initcall_start) = .; \
642 *(.con_initcall.init) \
643 VMLINUX_SYMBOL(__con_initcall_end) = .;
645 #define SECURITY_INITCALL \
646 VMLINUX_SYMBOL(__security_initcall_start) = .; \
647 *(.security_initcall.init) \
648 VMLINUX_SYMBOL(__security_initcall_end) = .;
650 #ifdef CONFIG_BLK_DEV_INITRD
651 #define INIT_RAM_FS \
653 VMLINUX_SYMBOL(__initramfs_start) = .; \
662 * Default discarded sections.
664 * Some archs want to discard exit text/data at runtime rather than
665 * link time due to cross-section references such as alt instructions,
666 * bug table, eh_frame, etc. DISCARDS must be the last of output
667 * section definitions so that such archs put those in earlier section
680 * PERCPU_INPUT - the percpu input sections
681 * @cacheline: cacheline size
683 * The core percpu section names and core symbols which do not rely
684 * directly upon load addresses.
686 * @cacheline is used to align subsections to avoid false cacheline
687 * sharing between subsections for different purposes.
689 #define PERCPU_INPUT(cacheline) \
690 VMLINUX_SYMBOL(__per_cpu_start) = .; \
691 *(.data..percpu..first) \
692 . = ALIGN(PAGE_SIZE); \
693 *(.data..percpu..page_aligned) \
694 . = ALIGN(cacheline); \
695 *(.data..percpu..readmostly) \
696 . = ALIGN(cacheline); \
698 *(.data..percpu..shared_aligned) \
699 VMLINUX_SYMBOL(__per_cpu_end) = .;
702 * PERCPU_VADDR - define output section for percpu area
703 * @cacheline: cacheline size
704 * @vaddr: explicit base address (optional)
705 * @phdr: destination PHDR (optional)
707 * Macro which expands to output section for percpu area.
709 * @cacheline is used to align subsections to avoid false cacheline
710 * sharing between subsections for different purposes.
712 * If @vaddr is not blank, it specifies explicit base address and all
713 * percpu symbols will be offset from the given address. If blank,
714 * @vaddr always equals @laddr + LOAD_OFFSET.
716 * @phdr defines the output PHDR to use if not blank. Be warned that
717 * output PHDR is sticky. If @phdr is specified, the next output
718 * section in the linker script will go there too. @phdr should have
721 * Note that this macros defines __per_cpu_load as an absolute symbol.
722 * If there is no need to put the percpu section at a predetermined
723 * address, use PERCPU_SECTION.
725 #define PERCPU_VADDR(cacheline, vaddr, phdr) \
726 VMLINUX_SYMBOL(__per_cpu_load) = .; \
727 .data..percpu vaddr : AT(VMLINUX_SYMBOL(__per_cpu_load) \
729 PERCPU_INPUT(cacheline) \
731 . = VMLINUX_SYMBOL(__per_cpu_load) + SIZEOF(.data..percpu);
734 * PERCPU_SECTION - define output section for percpu area, simple version
735 * @cacheline: cacheline size
737 * Align to PAGE_SIZE and outputs output section for percpu area. This
738 * macro doesn't manipulate @vaddr or @phdr and __per_cpu_load and
739 * __per_cpu_start will be identical.
741 * This macro is equivalent to ALIGN(PAGE_SIZE); PERCPU_VADDR(@cacheline,,)
742 * except that __per_cpu_load is defined as a relative symbol against
743 * .data..percpu which is required for relocatable x86_32 configuration.
745 #define PERCPU_SECTION(cacheline) \
746 . = ALIGN(PAGE_SIZE); \
747 .data..percpu : AT(ADDR(.data..percpu) - LOAD_OFFSET) { \
748 VMLINUX_SYMBOL(__per_cpu_load) = .; \
749 PERCPU_INPUT(cacheline) \
754 * Definition of the high level *_SECTION macros
755 * They will fit only a subset of the architectures
761 * All sections are combined in a single .data section.
762 * The sections following CONSTRUCTORS are arranged so their
763 * typical alignment matches.
764 * A cacheline is typical/always less than a PAGE_SIZE so
765 * the sections that has this restriction (or similar)
766 * is located before the ones requiring PAGE_SIZE alignment.
767 * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which
768 * matches the requirement of PAGE_ALIGNED_DATA.
770 * use 0 as page_align if page_aligned data is not used */
771 #define RW_DATA_SECTION(cacheline, pagealigned, inittask) \
772 . = ALIGN(PAGE_SIZE); \
773 .data : AT(ADDR(.data) - LOAD_OFFSET) { \
774 INIT_TASK_DATA(inittask) \
776 PAGE_ALIGNED_DATA(pagealigned) \
777 CACHELINE_ALIGNED_DATA(cacheline) \
778 READ_MOSTLY_DATA(cacheline) \
783 #define INIT_TEXT_SECTION(inittext_align) \
784 . = ALIGN(inittext_align); \
785 .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) { \
786 VMLINUX_SYMBOL(_sinittext) = .; \
788 VMLINUX_SYMBOL(_einittext) = .; \
791 #define INIT_DATA_SECTION(initsetup_align) \
792 .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) { \
794 INIT_SETUP(initsetup_align) \
801 #define BSS_SECTION(sbss_align, bss_align, stop_align) \
802 . = ALIGN(sbss_align); \
803 VMLINUX_SYMBOL(__bss_start) = .; \
806 . = ALIGN(stop_align); \
807 VMLINUX_SYMBOL(__bss_stop) = .;
809 #ifdef CONFIG_STACK_UNWIND
811 /* Unwind data binary search table */ \
813 .eh_frame_hdr : AT(ADDR(.eh_frame_hdr) - LOAD_OFFSET) { \
814 VMLINUX_SYMBOL(__start_unwind_hdr) = .; \
816 VMLINUX_SYMBOL(__end_unwind_hdr) = .; \
820 .eh_frame : AT(ADDR(.eh_frame) - LOAD_OFFSET) { \
821 VMLINUX_SYMBOL(__start_unwind) = .; \
823 VMLINUX_SYMBOL(__end_unwind) = .; \