vmlinux.lds.h (2b5c0c72ea404d6b554a8284031dd78748314b9e) vmlinux.lds.h (023bf6f1b8bf58dc4da7f0dc1cf4787b0d5297c1)
1/*
2 * Helper macros to support writing architecture specific
3 * linker scripts.
4 *
5 * A minimal linker scripts has following content:
6 * [This is a sample, architectures may have special requiriements]
7 *
8 * OUTPUT_FORMAT(...)

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30 * EXCEPTION_TABLE(...)
31 * NOTES
32 *
33 * __bss_start = .;
34 * BSS_SECTION(0, 0)
35 * __bss_stop = .;
36 * _end = .;
37 *
1/*
2 * Helper macros to support writing architecture specific
3 * linker scripts.
4 *
5 * A minimal linker scripts has following content:
6 * [This is a sample, architectures may have special requiriements]
7 *
8 * OUTPUT_FORMAT(...)

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30 * EXCEPTION_TABLE(...)
31 * NOTES
32 *
33 * __bss_start = .;
34 * BSS_SECTION(0, 0)
35 * __bss_stop = .;
36 * _end = .;
37 *
38 * /DISCARD/ : {
39 * EXIT_TEXT
40 * EXIT_DATA
41 * EXIT_CALL
42 * }
43 * STABS_DEBUG
44 * DWARF_DEBUG
38 * STABS_DEBUG
39 * DWARF_DEBUG
40 *
41 * DISCARDS // must be the last
45 * }
46 *
47 * [__init_begin, __init_end] is the init section that may be freed after init
48 * [_stext, _etext] is the text section
49 * [_sdata, _edata] is the data section
50 *
51 * Some of the included output section have their own set of constants.
52 * Examples are: [__initramfs_start, __initramfs_end] for initramfs and

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186#define READ_MOSTLY_DATA(align) \
187 . = ALIGN(align); \
188 *(.data.read_mostly)
189
190#define CACHELINE_ALIGNED_DATA(align) \
191 . = ALIGN(align); \
192 *(.data.cacheline_aligned)
193
42 * }
43 *
44 * [__init_begin, __init_end] is the init section that may be freed after init
45 * [_stext, _etext] is the text section
46 * [_sdata, _edata] is the data section
47 *
48 * Some of the included output section have their own set of constants.
49 * Examples are: [__initramfs_start, __initramfs_end] for initramfs and

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183#define READ_MOSTLY_DATA(align) \
184 . = ALIGN(align); \
185 *(.data.read_mostly)
186
187#define CACHELINE_ALIGNED_DATA(align) \
188 . = ALIGN(align); \
189 *(.data.cacheline_aligned)
190
194#define INIT_TASK_DATA(align) \
191#define INIT_TASK(align) \
195 . = ALIGN(align); \
196 *(.data.init_task)
197
198/*
199 * Read only Data
200 */
201#define RO_DATA_SECTION(align) \
202 . = ALIGN((align)); \

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429 VMLINUX_SYMBOL(__start___ex_table) = .; \
430 *(__ex_table) \
431 VMLINUX_SYMBOL(__stop___ex_table) = .; \
432 }
433
434/*
435 * Init task
436 */
192 . = ALIGN(align); \
193 *(.data.init_task)
194
195/*
196 * Read only Data
197 */
198#define RO_DATA_SECTION(align) \
199 . = ALIGN((align)); \

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426 VMLINUX_SYMBOL(__start___ex_table) = .; \
427 *(__ex_table) \
428 VMLINUX_SYMBOL(__stop___ex_table) = .; \
429 }
430
431/*
432 * Init task
433 */
437#define INIT_TASK_DATA_SECTION(align) \
434#define INIT_TASK_DATA(align) \
438 . = ALIGN(align); \
439 .data.init_task : { \
435 . = ALIGN(align); \
436 .data.init_task : { \
440 INIT_TASK_DATA(align) \
437 INIT_TASK \
441 }
442
443#ifdef CONFIG_CONSTRUCTORS
444#define KERNEL_CTORS() . = ALIGN(8); \
445 VMLINUX_SYMBOL(__ctors_start) = .; \
446 *(.ctors) \
447 VMLINUX_SYMBOL(__ctors_end) = .;
448#else

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624 . = ALIGN(PAGE_SIZE); \
625 VMLINUX_SYMBOL(__initramfs_start) = .; \
626 *(.init.ramfs) \
627 VMLINUX_SYMBOL(__initramfs_end) = .;
628#else
629#define INIT_RAM_FS
630#endif
631
438 }
439
440#ifdef CONFIG_CONSTRUCTORS
441#define KERNEL_CTORS() . = ALIGN(8); \
442 VMLINUX_SYMBOL(__ctors_start) = .; \
443 *(.ctors) \
444 VMLINUX_SYMBOL(__ctors_end) = .;
445#else

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621 . = ALIGN(PAGE_SIZE); \
622 VMLINUX_SYMBOL(__initramfs_start) = .; \
623 *(.init.ramfs) \
624 VMLINUX_SYMBOL(__initramfs_end) = .;
625#else
626#define INIT_RAM_FS
627#endif
628
629/*
630 * Default discarded sections.
631 *
632 * Some archs want to discard exit text/data at runtime rather than
633 * link time due to cross-section references such as alt instructions,
634 * bug table, eh_frame, etc. DISCARDS must be the last of output
635 * section definitions so that such archs put those in earlier section
636 * definitions.
637 */
638#define DISCARDS \
639 /DISCARD/ : { \
640 EXIT_TEXT \
641 EXIT_DATA \
642 EXIT_CALL \
643 *(.discard) \
644 }
645
632/**
633 * PERCPU_VADDR - define output section for percpu area
634 * @vaddr: explicit base address (optional)
635 * @phdr: destination PHDR (optional)
636 *
637 * Macro which expands to output section for percpu area. If @vaddr
638 * is not blank, it specifies explicit base address and all percpu
639 * symbols will be offset from the given address. If blank, @vaddr

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700 * typical alignment matches.
701 * A cacheline is typical/always less than a PAGE_SIZE so
702 * the sections that has this restriction (or similar)
703 * is located before the ones requiring PAGE_SIZE alignment.
704 * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which
705 * matches the requirment of PAGE_ALIGNED_DATA.
706 *
707 * use 0 as page_align if page_aligned data is not used */
646/**
647 * PERCPU_VADDR - define output section for percpu area
648 * @vaddr: explicit base address (optional)
649 * @phdr: destination PHDR (optional)
650 *
651 * Macro which expands to output section for percpu area. If @vaddr
652 * is not blank, it specifies explicit base address and all percpu
653 * symbols will be offset from the given address. If blank, @vaddr

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714 * typical alignment matches.
715 * A cacheline is typical/always less than a PAGE_SIZE so
716 * the sections that has this restriction (or similar)
717 * is located before the ones requiring PAGE_SIZE alignment.
718 * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which
719 * matches the requirment of PAGE_ALIGNED_DATA.
720 *
721 * use 0 as page_align if page_aligned data is not used */
708#define RW_DATA_SECTION(cacheline, pagealigned, inittask) \
722#define RW_DATA_SECTION(cacheline, nosave, pagealigned, inittask) \
709 . = ALIGN(PAGE_SIZE); \
710 .data : AT(ADDR(.data) - LOAD_OFFSET) { \
723 . = ALIGN(PAGE_SIZE); \
724 .data : AT(ADDR(.data) - LOAD_OFFSET) { \
711 INIT_TASK_DATA(inittask) \
725 INIT_TASK(inittask) \
712 CACHELINE_ALIGNED_DATA(cacheline) \
713 READ_MOSTLY_DATA(cacheline) \
714 DATA_DATA \
715 CONSTRUCTORS \
726 CACHELINE_ALIGNED_DATA(cacheline) \
727 READ_MOSTLY_DATA(cacheline) \
728 DATA_DATA \
729 CONSTRUCTORS \
716 NOSAVE_DATA \
730 NOSAVE_DATA(nosave) \
717 PAGE_ALIGNED_DATA(pagealigned) \
718 }
719
720#define INIT_TEXT_SECTION(inittext_align) \
721 . = ALIGN(inittext_align); \
722 .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) { \
723 VMLINUX_SYMBOL(_sinittext) = .; \
724 INIT_TEXT \

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732 }
733
734#define INIT_TEXT_SECTION(inittext_align) \
735 . = ALIGN(inittext_align); \
736 .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) { \
737 VMLINUX_SYMBOL(_sinittext) = .; \
738 INIT_TEXT \

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