]>
git.proxmox.com Git - mirror_ubuntu-zesty-kernel.git/blob - include/asm-generic/vmlinux.lds.h
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 * // __init_begin and __init_end should be page aligned, so that we can
44 * // free the whole .init memory
45 * [_stext, _etext] is the text section
46 * [_sdata, _edata] is the data section
48 * Some of the included output section have their own set of constants.
49 * Examples are: [__initramfs_start, __initramfs_end] for initramfs and
50 * [__nosave_begin, __nosave_end] for the nosave data
57 #include <linux/export.h>
59 /* Align . to a 8 byte boundary equals to maximum function alignment. */
60 #define ALIGN_FUNCTION() . = ALIGN(8)
63 * Align to a 32 byte boundary equal to the
64 * alignment gcc 4.5 uses for a struct
66 #define STRUCT_ALIGNMENT 32
67 #define STRUCT_ALIGN() . = ALIGN(STRUCT_ALIGNMENT)
69 /* The actual configuration determine if the init/exit sections
70 * are handled as text/data or they can be discarded (which
71 * often happens at runtime)
73 #ifdef CONFIG_HOTPLUG_CPU
74 #define CPU_KEEP(sec) *(.cpu##sec)
75 #define CPU_DISCARD(sec)
78 #define CPU_DISCARD(sec) *(.cpu##sec)
81 #if defined(CONFIG_MEMORY_HOTPLUG)
82 #define MEM_KEEP(sec) *(.mem##sec)
83 #define MEM_DISCARD(sec)
86 #define MEM_DISCARD(sec) *(.mem##sec)
89 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
90 #define MCOUNT_REC() . = ALIGN(8); \
91 VMLINUX_SYMBOL(__start_mcount_loc) = .; \
93 VMLINUX_SYMBOL(__stop_mcount_loc) = .;
98 #ifdef CONFIG_TRACE_BRANCH_PROFILING
99 #define LIKELY_PROFILE() VMLINUX_SYMBOL(__start_annotated_branch_profile) = .; \
100 *(_ftrace_annotated_branch) \
101 VMLINUX_SYMBOL(__stop_annotated_branch_profile) = .;
103 #define LIKELY_PROFILE()
106 #ifdef CONFIG_PROFILE_ALL_BRANCHES
107 #define BRANCH_PROFILE() VMLINUX_SYMBOL(__start_branch_profile) = .; \
109 VMLINUX_SYMBOL(__stop_branch_profile) = .;
111 #define BRANCH_PROFILE()
114 #ifdef CONFIG_KPROBES
115 #define KPROBE_BLACKLIST() . = ALIGN(8); \
116 VMLINUX_SYMBOL(__start_kprobe_blacklist) = .; \
117 *(_kprobe_blacklist) \
118 VMLINUX_SYMBOL(__stop_kprobe_blacklist) = .;
120 #define KPROBE_BLACKLIST()
123 #ifdef CONFIG_EVENT_TRACING
124 #define FTRACE_EVENTS() . = ALIGN(8); \
125 VMLINUX_SYMBOL(__start_ftrace_events) = .; \
127 VMLINUX_SYMBOL(__stop_ftrace_events) = .; \
128 VMLINUX_SYMBOL(__start_ftrace_enum_maps) = .; \
129 *(_ftrace_enum_map) \
130 VMLINUX_SYMBOL(__stop_ftrace_enum_maps) = .;
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) = .;
139 #define TRACEPOINT_STR() VMLINUX_SYMBOL(__start___tracepoint_str) = .; \
140 *(__tracepoint_str) /* Trace_printk fmt' pointer */ \
141 VMLINUX_SYMBOL(__stop___tracepoint_str) = .;
143 #define TRACE_PRINTKS()
144 #define TRACEPOINT_STR()
147 #ifdef CONFIG_FTRACE_SYSCALLS
148 #define TRACE_SYSCALLS() . = ALIGN(8); \
149 VMLINUX_SYMBOL(__start_syscalls_metadata) = .; \
150 *(__syscalls_metadata) \
151 VMLINUX_SYMBOL(__stop_syscalls_metadata) = .;
153 #define TRACE_SYSCALLS()
157 #define ___OF_TABLE(cfg, name) _OF_TABLE_##cfg(name)
158 #define __OF_TABLE(cfg, name) ___OF_TABLE(cfg, name)
159 #define OF_TABLE(cfg, name) __OF_TABLE(config_enabled(cfg), name)
160 #define _OF_TABLE_0(name)
161 #define _OF_TABLE_1(name) \
163 VMLINUX_SYMBOL(__##name##_of_table) = .; \
164 *(__##name##_of_table) \
165 *(__##name##_of_table_end)
167 #define CLKSRC_OF_TABLES() OF_TABLE(CONFIG_CLKSRC_OF, clksrc)
168 #define IRQCHIP_OF_MATCH_TABLE() OF_TABLE(CONFIG_IRQCHIP, irqchip)
169 #define CLK_OF_TABLES() OF_TABLE(CONFIG_COMMON_CLK, clk)
170 #define IOMMU_OF_TABLES() OF_TABLE(CONFIG_OF_IOMMU, iommu)
171 #define RESERVEDMEM_OF_TABLES() OF_TABLE(CONFIG_OF_RESERVED_MEM, reservedmem)
172 #define CPU_METHOD_OF_TABLES() OF_TABLE(CONFIG_SMP, cpu_method)
173 #define CPUIDLE_METHOD_OF_TABLES() OF_TABLE(CONFIG_CPU_IDLE, cpuidle_method)
174 #define EARLYCON_OF_TABLES() OF_TABLE(CONFIG_SERIAL_EARLYCON, earlycon)
176 #define KERNEL_DTB() \
178 VMLINUX_SYMBOL(__dtb_start) = .; \
179 *(.dtb.init.rodata) \
180 VMLINUX_SYMBOL(__dtb_end) = .;
186 *(.data..shared_aligned) /* percpu related */ \
187 MEM_KEEP(init.data) \
188 MEM_KEEP(exit.data) \
192 /* implement dynamic printk debug */ \
194 VMLINUX_SYMBOL(__start___jump_table) = .; \
196 VMLINUX_SYMBOL(__stop___jump_table) = .; \
198 VMLINUX_SYMBOL(__start___verbose) = .; \
200 VMLINUX_SYMBOL(__stop___verbose) = .; \
207 * Data section helpers
209 #define NOSAVE_DATA \
210 . = ALIGN(PAGE_SIZE); \
211 VMLINUX_SYMBOL(__nosave_begin) = .; \
213 . = ALIGN(PAGE_SIZE); \
214 VMLINUX_SYMBOL(__nosave_end) = .;
216 #define PAGE_ALIGNED_DATA(page_align) \
217 . = ALIGN(page_align); \
218 *(.data..page_aligned)
220 #define READ_MOSTLY_DATA(align) \
222 *(.data..read_mostly) \
225 #define CACHELINE_ALIGNED_DATA(align) \
227 *(.data..cacheline_aligned)
229 #define INIT_TASK_DATA(align) \
236 #define RO_DATA_SECTION(align) \
237 . = ALIGN((align)); \
238 .rodata : AT(ADDR(.rodata) - LOAD_OFFSET) { \
239 VMLINUX_SYMBOL(__start_rodata) = .; \
240 *(.rodata) *(.rodata.*) \
241 *(__vermagic) /* Kernel version magic */ \
243 VMLINUX_SYMBOL(__start___tracepoints_ptrs) = .; \
244 *(__tracepoints_ptrs) /* Tracepoints: pointer array */\
245 VMLINUX_SYMBOL(__stop___tracepoints_ptrs) = .; \
246 *(__tracepoints_strings)/* Tracepoints: strings */ \
249 .rodata1 : AT(ADDR(.rodata1) - LOAD_OFFSET) { \
256 .pci_fixup : AT(ADDR(.pci_fixup) - LOAD_OFFSET) { \
257 VMLINUX_SYMBOL(__start_pci_fixups_early) = .; \
258 *(.pci_fixup_early) \
259 VMLINUX_SYMBOL(__end_pci_fixups_early) = .; \
260 VMLINUX_SYMBOL(__start_pci_fixups_header) = .; \
261 *(.pci_fixup_header) \
262 VMLINUX_SYMBOL(__end_pci_fixups_header) = .; \
263 VMLINUX_SYMBOL(__start_pci_fixups_final) = .; \
264 *(.pci_fixup_final) \
265 VMLINUX_SYMBOL(__end_pci_fixups_final) = .; \
266 VMLINUX_SYMBOL(__start_pci_fixups_enable) = .; \
267 *(.pci_fixup_enable) \
268 VMLINUX_SYMBOL(__end_pci_fixups_enable) = .; \
269 VMLINUX_SYMBOL(__start_pci_fixups_resume) = .; \
270 *(.pci_fixup_resume) \
271 VMLINUX_SYMBOL(__end_pci_fixups_resume) = .; \
272 VMLINUX_SYMBOL(__start_pci_fixups_resume_early) = .; \
273 *(.pci_fixup_resume_early) \
274 VMLINUX_SYMBOL(__end_pci_fixups_resume_early) = .; \
275 VMLINUX_SYMBOL(__start_pci_fixups_suspend) = .; \
276 *(.pci_fixup_suspend) \
277 VMLINUX_SYMBOL(__end_pci_fixups_suspend) = .; \
278 VMLINUX_SYMBOL(__start_pci_fixups_suspend_late) = .; \
279 *(.pci_fixup_suspend_late) \
280 VMLINUX_SYMBOL(__end_pci_fixups_suspend_late) = .; \
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) = .; \
485 *(SORT(.init_array.*)) \
487 VMLINUX_SYMBOL(__ctors_end) = .;
489 #define KERNEL_CTORS()
492 /* init and exit section handling */
495 MEM_DISCARD(init.data) \
502 MEM_DISCARD(init.rodata) \
504 RESERVEDMEM_OF_TABLES() \
507 CPU_METHOD_OF_TABLES() \
508 CPUIDLE_METHOD_OF_TABLES() \
510 IRQCHIP_OF_MATCH_TABLE() \
515 MEM_DISCARD(init.text)
519 MEM_DISCARD(exit.data) \
520 MEM_DISCARD(exit.rodata)
524 MEM_DISCARD(exit.text)
530 * bss (Block Started by Symbol) - uninitialized data
531 * zeroed during startup
533 #define SBSS(sbss_align) \
534 . = ALIGN(sbss_align); \
535 .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) { \
541 * Allow archectures to redefine BSS_FIRST_SECTIONS to add extra
542 * sections to the front of bss.
544 #ifndef BSS_FIRST_SECTIONS
545 #define BSS_FIRST_SECTIONS
548 #define BSS(bss_align) \
549 . = ALIGN(bss_align); \
550 .bss : AT(ADDR(.bss) - LOAD_OFFSET) { \
552 *(.bss..page_aligned) \
559 * DWARF debug sections.
560 * Symbols in the DWARF debugging sections are relative to
561 * the beginning of the section so we begin them at 0.
563 #define DWARF_DEBUG \
565 .debug 0 : { *(.debug) } \
566 .line 0 : { *(.line) } \
567 /* GNU DWARF 1 extensions */ \
568 .debug_srcinfo 0 : { *(.debug_srcinfo) } \
569 .debug_sfnames 0 : { *(.debug_sfnames) } \
570 /* DWARF 1.1 and DWARF 2 */ \
571 .debug_aranges 0 : { *(.debug_aranges) } \
572 .debug_pubnames 0 : { *(.debug_pubnames) } \
574 .debug_info 0 : { *(.debug_info \
575 .gnu.linkonce.wi.*) } \
576 .debug_abbrev 0 : { *(.debug_abbrev) } \
577 .debug_line 0 : { *(.debug_line) } \
578 .debug_frame 0 : { *(.debug_frame) } \
579 .debug_str 0 : { *(.debug_str) } \
580 .debug_loc 0 : { *(.debug_loc) } \
581 .debug_macinfo 0 : { *(.debug_macinfo) } \
582 /* SGI/MIPS DWARF 2 extensions */ \
583 .debug_weaknames 0 : { *(.debug_weaknames) } \
584 .debug_funcnames 0 : { *(.debug_funcnames) } \
585 .debug_typenames 0 : { *(.debug_typenames) } \
586 .debug_varnames 0 : { *(.debug_varnames) } \
588 /* Stabs debugging sections. */
589 #define STABS_DEBUG \
590 .stab 0 : { *(.stab) } \
591 .stabstr 0 : { *(.stabstr) } \
592 .stab.excl 0 : { *(.stab.excl) } \
593 .stab.exclstr 0 : { *(.stab.exclstr) } \
594 .stab.index 0 : { *(.stab.index) } \
595 .stab.indexstr 0 : { *(.stab.indexstr) } \
596 .comment 0 : { *(.comment) }
598 #ifdef CONFIG_GENERIC_BUG
601 __bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) { \
602 VMLINUX_SYMBOL(__start___bug_table) = .; \
604 VMLINUX_SYMBOL(__stop___bug_table) = .; \
610 #ifdef CONFIG_PM_TRACE
613 .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) { \
614 VMLINUX_SYMBOL(__tracedata_start) = .; \
616 VMLINUX_SYMBOL(__tracedata_end) = .; \
623 .notes : AT(ADDR(.notes) - LOAD_OFFSET) { \
624 VMLINUX_SYMBOL(__start_notes) = .; \
626 VMLINUX_SYMBOL(__stop_notes) = .; \
629 #define INIT_SETUP(initsetup_align) \
630 . = ALIGN(initsetup_align); \
631 VMLINUX_SYMBOL(__setup_start) = .; \
633 VMLINUX_SYMBOL(__setup_end) = .;
635 #define INIT_CALLS_LEVEL(level) \
636 VMLINUX_SYMBOL(__initcall##level##_start) = .; \
637 *(.initcall##level##.init) \
638 *(.initcall##level##s.init) \
641 VMLINUX_SYMBOL(__initcall_start) = .; \
642 *(.initcallearly.init) \
643 INIT_CALLS_LEVEL(0) \
644 INIT_CALLS_LEVEL(1) \
645 INIT_CALLS_LEVEL(2) \
646 INIT_CALLS_LEVEL(3) \
647 INIT_CALLS_LEVEL(4) \
648 INIT_CALLS_LEVEL(5) \
649 INIT_CALLS_LEVEL(rootfs) \
650 INIT_CALLS_LEVEL(6) \
651 INIT_CALLS_LEVEL(7) \
652 VMLINUX_SYMBOL(__initcall_end) = .;
654 #define CON_INITCALL \
655 VMLINUX_SYMBOL(__con_initcall_start) = .; \
656 *(.con_initcall.init) \
657 VMLINUX_SYMBOL(__con_initcall_end) = .;
659 #define SECURITY_INITCALL \
660 VMLINUX_SYMBOL(__security_initcall_start) = .; \
661 *(.security_initcall.init) \
662 VMLINUX_SYMBOL(__security_initcall_end) = .;
664 #ifdef CONFIG_BLK_DEV_INITRD
665 #define INIT_RAM_FS \
667 VMLINUX_SYMBOL(__initramfs_start) = .; \
676 * Default discarded sections.
678 * Some archs want to discard exit text/data at runtime rather than
679 * link time due to cross-section references such as alt instructions,
680 * bug table, eh_frame, etc. DISCARDS must be the last of output
681 * section definitions so that such archs put those in earlier section
694 * PERCPU_INPUT - the percpu input sections
695 * @cacheline: cacheline size
697 * The core percpu section names and core symbols which do not rely
698 * directly upon load addresses.
700 * @cacheline is used to align subsections to avoid false cacheline
701 * sharing between subsections for different purposes.
703 #define PERCPU_INPUT(cacheline) \
704 VMLINUX_SYMBOL(__per_cpu_start) = .; \
705 *(.data..percpu..first) \
706 . = ALIGN(PAGE_SIZE); \
707 *(.data..percpu..page_aligned) \
708 . = ALIGN(cacheline); \
709 *(.data..percpu..read_mostly) \
710 . = ALIGN(cacheline); \
712 *(.data..percpu..shared_aligned) \
713 VMLINUX_SYMBOL(__per_cpu_end) = .;
716 * PERCPU_VADDR - define output section for percpu area
717 * @cacheline: cacheline size
718 * @vaddr: explicit base address (optional)
719 * @phdr: destination PHDR (optional)
721 * Macro which expands to output section for percpu area.
723 * @cacheline is used to align subsections to avoid false cacheline
724 * sharing between subsections for different purposes.
726 * If @vaddr is not blank, it specifies explicit base address and all
727 * percpu symbols will be offset from the given address. If blank,
728 * @vaddr always equals @laddr + LOAD_OFFSET.
730 * @phdr defines the output PHDR to use if not blank. Be warned that
731 * output PHDR is sticky. If @phdr is specified, the next output
732 * section in the linker script will go there too. @phdr should have
735 * Note that this macros defines __per_cpu_load as an absolute symbol.
736 * If there is no need to put the percpu section at a predetermined
737 * address, use PERCPU_SECTION.
739 #define PERCPU_VADDR(cacheline, vaddr, phdr) \
740 VMLINUX_SYMBOL(__per_cpu_load) = .; \
741 .data..percpu vaddr : AT(VMLINUX_SYMBOL(__per_cpu_load) \
743 PERCPU_INPUT(cacheline) \
745 . = VMLINUX_SYMBOL(__per_cpu_load) + SIZEOF(.data..percpu);
748 * PERCPU_SECTION - define output section for percpu area, simple version
749 * @cacheline: cacheline size
751 * Align to PAGE_SIZE and outputs output section for percpu area. This
752 * macro doesn't manipulate @vaddr or @phdr and __per_cpu_load and
753 * __per_cpu_start will be identical.
755 * This macro is equivalent to ALIGN(PAGE_SIZE); PERCPU_VADDR(@cacheline,,)
756 * except that __per_cpu_load is defined as a relative symbol against
757 * .data..percpu which is required for relocatable x86_32 configuration.
759 #define PERCPU_SECTION(cacheline) \
760 . = ALIGN(PAGE_SIZE); \
761 .data..percpu : AT(ADDR(.data..percpu) - LOAD_OFFSET) { \
762 VMLINUX_SYMBOL(__per_cpu_load) = .; \
763 PERCPU_INPUT(cacheline) \
768 * Definition of the high level *_SECTION macros
769 * They will fit only a subset of the architectures
775 * All sections are combined in a single .data section.
776 * The sections following CONSTRUCTORS are arranged so their
777 * typical alignment matches.
778 * A cacheline is typical/always less than a PAGE_SIZE so
779 * the sections that has this restriction (or similar)
780 * is located before the ones requiring PAGE_SIZE alignment.
781 * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which
782 * matches the requirement of PAGE_ALIGNED_DATA.
784 * use 0 as page_align if page_aligned data is not used */
785 #define RW_DATA_SECTION(cacheline, pagealigned, inittask) \
786 . = ALIGN(PAGE_SIZE); \
787 .data : AT(ADDR(.data) - LOAD_OFFSET) { \
788 INIT_TASK_DATA(inittask) \
790 PAGE_ALIGNED_DATA(pagealigned) \
791 CACHELINE_ALIGNED_DATA(cacheline) \
792 READ_MOSTLY_DATA(cacheline) \
797 #define INIT_TEXT_SECTION(inittext_align) \
798 . = ALIGN(inittext_align); \
799 .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) { \
800 VMLINUX_SYMBOL(_sinittext) = .; \
802 VMLINUX_SYMBOL(_einittext) = .; \
805 #define INIT_DATA_SECTION(initsetup_align) \
806 .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) { \
808 INIT_SETUP(initsetup_align) \
815 #define BSS_SECTION(sbss_align, bss_align, stop_align) \
816 . = ALIGN(sbss_align); \
817 VMLINUX_SYMBOL(__bss_start) = .; \
820 . = ALIGN(stop_align); \
821 VMLINUX_SYMBOL(__bss_stop) = .;