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()
156 #ifdef CONFIG_SERIAL_EARLYCON
157 #define EARLYCON_TABLE() STRUCT_ALIGN(); \
158 VMLINUX_SYMBOL(__earlycon_table) = .; \
159 *(__earlycon_table) \
160 *(__earlycon_table_end)
162 #define EARLYCON_TABLE()
165 #define ___OF_TABLE(cfg, name) _OF_TABLE_##cfg(name)
166 #define __OF_TABLE(cfg, name) ___OF_TABLE(cfg, name)
167 #define OF_TABLE(cfg, name) __OF_TABLE(config_enabled(cfg), name)
168 #define _OF_TABLE_0(name)
169 #define _OF_TABLE_1(name) \
171 VMLINUX_SYMBOL(__##name##_of_table) = .; \
172 *(__##name##_of_table) \
173 *(__##name##_of_table_end)
175 #define CLKSRC_OF_TABLES() OF_TABLE(CONFIG_CLKSRC_OF, clksrc)
176 #define IRQCHIP_OF_MATCH_TABLE() OF_TABLE(CONFIG_IRQCHIP, irqchip)
177 #define CLK_OF_TABLES() OF_TABLE(CONFIG_COMMON_CLK, clk)
178 #define IOMMU_OF_TABLES() OF_TABLE(CONFIG_OF_IOMMU, iommu)
179 #define RESERVEDMEM_OF_TABLES() OF_TABLE(CONFIG_OF_RESERVED_MEM, reservedmem)
180 #define CPU_METHOD_OF_TABLES() OF_TABLE(CONFIG_SMP, cpu_method)
181 #define CPUIDLE_METHOD_OF_TABLES() OF_TABLE(CONFIG_CPU_IDLE, cpuidle_method)
182 #define EARLYCON_OF_TABLES() OF_TABLE(CONFIG_SERIAL_EARLYCON, earlycon)
185 #define ACPI_PROBE_TABLE(name) \
187 VMLINUX_SYMBOL(__##name##_acpi_probe_table) = .; \
188 *(__##name##_acpi_probe_table) \
189 VMLINUX_SYMBOL(__##name##_acpi_probe_table_end) = .;
191 #define ACPI_PROBE_TABLE(name)
194 #define KERNEL_DTB() \
196 VMLINUX_SYMBOL(__dtb_start) = .; \
197 *(.dtb.init.rodata) \
198 VMLINUX_SYMBOL(__dtb_end) = .;
204 *(.data..shared_aligned) /* percpu related */ \
205 MEM_KEEP(init.data) \
206 MEM_KEEP(exit.data) \
210 /* implement dynamic printk debug */ \
212 VMLINUX_SYMBOL(__start___jump_table) = .; \
214 VMLINUX_SYMBOL(__stop___jump_table) = .; \
216 VMLINUX_SYMBOL(__start___verbose) = .; \
218 VMLINUX_SYMBOL(__stop___verbose) = .; \
225 * Data section helpers
227 #define NOSAVE_DATA \
228 . = ALIGN(PAGE_SIZE); \
229 VMLINUX_SYMBOL(__nosave_begin) = .; \
231 . = ALIGN(PAGE_SIZE); \
232 VMLINUX_SYMBOL(__nosave_end) = .;
234 #define PAGE_ALIGNED_DATA(page_align) \
235 . = ALIGN(page_align); \
236 *(.data..page_aligned)
238 #define READ_MOSTLY_DATA(align) \
240 *(.data..read_mostly) \
243 #define CACHELINE_ALIGNED_DATA(align) \
245 *(.data..cacheline_aligned)
247 #define INIT_TASK_DATA(align) \
254 #define RO_DATA_SECTION(align) \
255 . = ALIGN((align)); \
256 .rodata : AT(ADDR(.rodata) - LOAD_OFFSET) { \
257 VMLINUX_SYMBOL(__start_rodata) = .; \
258 *(.rodata) *(.rodata.*) \
259 *(__vermagic) /* Kernel version magic */ \
261 VMLINUX_SYMBOL(__start___tracepoints_ptrs) = .; \
262 *(__tracepoints_ptrs) /* Tracepoints: pointer array */\
263 VMLINUX_SYMBOL(__stop___tracepoints_ptrs) = .; \
264 *(__tracepoints_strings)/* Tracepoints: strings */ \
267 .rodata1 : AT(ADDR(.rodata1) - LOAD_OFFSET) { \
274 .pci_fixup : AT(ADDR(.pci_fixup) - LOAD_OFFSET) { \
275 VMLINUX_SYMBOL(__start_pci_fixups_early) = .; \
276 *(.pci_fixup_early) \
277 VMLINUX_SYMBOL(__end_pci_fixups_early) = .; \
278 VMLINUX_SYMBOL(__start_pci_fixups_header) = .; \
279 *(.pci_fixup_header) \
280 VMLINUX_SYMBOL(__end_pci_fixups_header) = .; \
281 VMLINUX_SYMBOL(__start_pci_fixups_final) = .; \
282 *(.pci_fixup_final) \
283 VMLINUX_SYMBOL(__end_pci_fixups_final) = .; \
284 VMLINUX_SYMBOL(__start_pci_fixups_enable) = .; \
285 *(.pci_fixup_enable) \
286 VMLINUX_SYMBOL(__end_pci_fixups_enable) = .; \
287 VMLINUX_SYMBOL(__start_pci_fixups_resume) = .; \
288 *(.pci_fixup_resume) \
289 VMLINUX_SYMBOL(__end_pci_fixups_resume) = .; \
290 VMLINUX_SYMBOL(__start_pci_fixups_resume_early) = .; \
291 *(.pci_fixup_resume_early) \
292 VMLINUX_SYMBOL(__end_pci_fixups_resume_early) = .; \
293 VMLINUX_SYMBOL(__start_pci_fixups_suspend) = .; \
294 *(.pci_fixup_suspend) \
295 VMLINUX_SYMBOL(__end_pci_fixups_suspend) = .; \
296 VMLINUX_SYMBOL(__start_pci_fixups_suspend_late) = .; \
297 *(.pci_fixup_suspend_late) \
298 VMLINUX_SYMBOL(__end_pci_fixups_suspend_late) = .; \
301 /* Built-in firmware blobs */ \
302 .builtin_fw : AT(ADDR(.builtin_fw) - LOAD_OFFSET) { \
303 VMLINUX_SYMBOL(__start_builtin_fw) = .; \
305 VMLINUX_SYMBOL(__end_builtin_fw) = .; \
310 /* Kernel symbol table: Normal symbols */ \
311 __ksymtab : AT(ADDR(__ksymtab) - LOAD_OFFSET) { \
312 VMLINUX_SYMBOL(__start___ksymtab) = .; \
313 *(SORT(___ksymtab+*)) \
314 VMLINUX_SYMBOL(__stop___ksymtab) = .; \
317 /* Kernel symbol table: GPL-only symbols */ \
318 __ksymtab_gpl : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) { \
319 VMLINUX_SYMBOL(__start___ksymtab_gpl) = .; \
320 *(SORT(___ksymtab_gpl+*)) \
321 VMLINUX_SYMBOL(__stop___ksymtab_gpl) = .; \
324 /* Kernel symbol table: Normal unused symbols */ \
325 __ksymtab_unused : AT(ADDR(__ksymtab_unused) - LOAD_OFFSET) { \
326 VMLINUX_SYMBOL(__start___ksymtab_unused) = .; \
327 *(SORT(___ksymtab_unused+*)) \
328 VMLINUX_SYMBOL(__stop___ksymtab_unused) = .; \
331 /* Kernel symbol table: GPL-only unused symbols */ \
332 __ksymtab_unused_gpl : AT(ADDR(__ksymtab_unused_gpl) - LOAD_OFFSET) { \
333 VMLINUX_SYMBOL(__start___ksymtab_unused_gpl) = .; \
334 *(SORT(___ksymtab_unused_gpl+*)) \
335 VMLINUX_SYMBOL(__stop___ksymtab_unused_gpl) = .; \
338 /* Kernel symbol table: GPL-future-only symbols */ \
339 __ksymtab_gpl_future : AT(ADDR(__ksymtab_gpl_future) - LOAD_OFFSET) { \
340 VMLINUX_SYMBOL(__start___ksymtab_gpl_future) = .; \
341 *(SORT(___ksymtab_gpl_future+*)) \
342 VMLINUX_SYMBOL(__stop___ksymtab_gpl_future) = .; \
345 /* Kernel symbol table: Normal symbols */ \
346 __kcrctab : AT(ADDR(__kcrctab) - LOAD_OFFSET) { \
347 VMLINUX_SYMBOL(__start___kcrctab) = .; \
348 *(SORT(___kcrctab+*)) \
349 VMLINUX_SYMBOL(__stop___kcrctab) = .; \
352 /* Kernel symbol table: GPL-only symbols */ \
353 __kcrctab_gpl : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) { \
354 VMLINUX_SYMBOL(__start___kcrctab_gpl) = .; \
355 *(SORT(___kcrctab_gpl+*)) \
356 VMLINUX_SYMBOL(__stop___kcrctab_gpl) = .; \
359 /* Kernel symbol table: Normal unused symbols */ \
360 __kcrctab_unused : AT(ADDR(__kcrctab_unused) - LOAD_OFFSET) { \
361 VMLINUX_SYMBOL(__start___kcrctab_unused) = .; \
362 *(SORT(___kcrctab_unused+*)) \
363 VMLINUX_SYMBOL(__stop___kcrctab_unused) = .; \
366 /* Kernel symbol table: GPL-only unused symbols */ \
367 __kcrctab_unused_gpl : AT(ADDR(__kcrctab_unused_gpl) - LOAD_OFFSET) { \
368 VMLINUX_SYMBOL(__start___kcrctab_unused_gpl) = .; \
369 *(SORT(___kcrctab_unused_gpl+*)) \
370 VMLINUX_SYMBOL(__stop___kcrctab_unused_gpl) = .; \
373 /* Kernel symbol table: GPL-future-only symbols */ \
374 __kcrctab_gpl_future : AT(ADDR(__kcrctab_gpl_future) - LOAD_OFFSET) { \
375 VMLINUX_SYMBOL(__start___kcrctab_gpl_future) = .; \
376 *(SORT(___kcrctab_gpl_future+*)) \
377 VMLINUX_SYMBOL(__stop___kcrctab_gpl_future) = .; \
380 /* Kernel symbol table: strings */ \
381 __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \
382 *(__ksymtab_strings) \
385 /* __*init sections */ \
386 __init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) { \
388 MEM_KEEP(init.rodata) \
389 MEM_KEEP(exit.rodata) \
392 /* Built-in module parameters. */ \
393 __param : AT(ADDR(__param) - LOAD_OFFSET) { \
394 VMLINUX_SYMBOL(__start___param) = .; \
396 VMLINUX_SYMBOL(__stop___param) = .; \
399 /* Built-in module versions. */ \
400 __modver : AT(ADDR(__modver) - LOAD_OFFSET) { \
401 VMLINUX_SYMBOL(__start___modver) = .; \
403 VMLINUX_SYMBOL(__stop___modver) = .; \
404 . = ALIGN((align)); \
405 VMLINUX_SYMBOL(__end_rodata) = .; \
409 /* RODATA & RO_DATA provided for backward compatibility.
410 * All archs are supposed to use RO_DATA() */
411 #define RODATA RO_DATA_SECTION(4096)
412 #define RO_DATA(align) RO_DATA_SECTION(align)
414 #define SECURITY_INIT \
415 .security_initcall.init : AT(ADDR(.security_initcall.init) - LOAD_OFFSET) { \
416 VMLINUX_SYMBOL(__security_initcall_start) = .; \
417 *(.security_initcall.init) \
418 VMLINUX_SYMBOL(__security_initcall_end) = .; \
421 /* .text section. Map to function alignment to avoid address changes
422 * during second ld run in second ld pass when generating System.map */
425 *(.text.hot .text .text.fixup .text.unlikely) \
427 MEM_KEEP(init.text) \
428 MEM_KEEP(exit.text) \
431 /* sched.text is aling to function alignment to secure we have same
432 * address even at second ld pass when generating System.map */
435 VMLINUX_SYMBOL(__sched_text_start) = .; \
437 VMLINUX_SYMBOL(__sched_text_end) = .;
439 /* spinlock.text is aling to function alignment to secure we have same
440 * address even at second ld pass when generating System.map */
443 VMLINUX_SYMBOL(__lock_text_start) = .; \
445 VMLINUX_SYMBOL(__lock_text_end) = .;
447 #define KPROBES_TEXT \
449 VMLINUX_SYMBOL(__kprobes_text_start) = .; \
451 VMLINUX_SYMBOL(__kprobes_text_end) = .;
455 VMLINUX_SYMBOL(__entry_text_start) = .; \
457 VMLINUX_SYMBOL(__entry_text_end) = .;
459 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
460 #define IRQENTRY_TEXT \
462 VMLINUX_SYMBOL(__irqentry_text_start) = .; \
464 VMLINUX_SYMBOL(__irqentry_text_end) = .;
466 #define IRQENTRY_TEXT
469 /* Section used for early init (in .S files) */
470 #define HEAD_TEXT *(.head.text)
472 #define HEAD_TEXT_SECTION \
473 .head.text : AT(ADDR(.head.text) - LOAD_OFFSET) { \
480 #define EXCEPTION_TABLE(align) \
482 __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) { \
483 VMLINUX_SYMBOL(__start___ex_table) = .; \
485 VMLINUX_SYMBOL(__stop___ex_table) = .; \
491 #define INIT_TASK_DATA_SECTION(align) \
493 .data..init_task : AT(ADDR(.data..init_task) - LOAD_OFFSET) { \
494 INIT_TASK_DATA(align) \
497 #ifdef CONFIG_CONSTRUCTORS
498 #define KERNEL_CTORS() . = ALIGN(8); \
499 VMLINUX_SYMBOL(__ctors_start) = .; \
501 *(SORT(.init_array.*)) \
503 VMLINUX_SYMBOL(__ctors_end) = .;
505 #define KERNEL_CTORS()
508 /* init and exit section handling */
511 MEM_DISCARD(init.data) \
518 MEM_DISCARD(init.rodata) \
520 RESERVEDMEM_OF_TABLES() \
523 CPU_METHOD_OF_TABLES() \
524 CPUIDLE_METHOD_OF_TABLES() \
526 IRQCHIP_OF_MATCH_TABLE() \
527 ACPI_PROBE_TABLE(irqchip) \
528 ACPI_PROBE_TABLE(clksrc) \
535 MEM_DISCARD(init.text)
541 MEM_DISCARD(exit.data) \
542 MEM_DISCARD(exit.rodata)
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..read_mostly) \
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) = .;