vmlinux.lds.h 25.4 KB
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/*
 * Helper macros to support writing architecture specific
 * linker scripts.
 *
 * A minimal linker scripts has following content:
 * [This is a sample, architectures may have special requiriements]
 *
 * OUTPUT_FORMAT(...)
 * OUTPUT_ARCH(...)
 * ENTRY(...)
 * SECTIONS
 * {
 *	. = START;
 *	__init_begin = .;
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 *	HEAD_TEXT_SECTION
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 *	INIT_TEXT_SECTION(PAGE_SIZE)
 *	INIT_DATA_SECTION(...)
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 *	PERCPU_SECTION(CACHELINE_SIZE)
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 *	__init_end = .;
 *
 *	_stext = .;
 *	TEXT_SECTION = 0
 *	_etext = .;
 *
 *      _sdata = .;
 *	RO_DATA_SECTION(PAGE_SIZE)
 *	RW_DATA_SECTION(...)
 *	_edata = .;
 *
 *	EXCEPTION_TABLE(...)
 *	NOTES
 *
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 *	BSS_SECTION(0, 0, 0)
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 *	_end = .;
 *
 *	STABS_DEBUG
 *	DWARF_DEBUG
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 *
 *	DISCARDS		// must be the last
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 * }
 *
 * [__init_begin, __init_end] is the init section that may be freed after init
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 * 	// __init_begin and __init_end should be page aligned, so that we can
 *	// free the whole .init memory
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 * [_stext, _etext] is the text section
 * [_sdata, _edata] is the data section
 *
 * Some of the included output section have their own set of constants.
 * Examples are: [__initramfs_start, __initramfs_end] for initramfs and
 *               [__nosave_begin, __nosave_end] for the nosave data
 */
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#ifndef LOAD_OFFSET
#define LOAD_OFFSET 0
#endif

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#include <linux/export.h>
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/* Align . to a 8 byte boundary equals to maximum function alignment. */
#define ALIGN_FUNCTION()  . = ALIGN(8)

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/*
 * Align to a 32 byte boundary equal to the
 * alignment gcc 4.5 uses for a struct
 */
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#define STRUCT_ALIGNMENT 32
#define STRUCT_ALIGN() . = ALIGN(STRUCT_ALIGNMENT)
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/* The actual configuration determine if the init/exit sections
 * are handled as text/data or they can be discarded (which
 * often happens at runtime)
 */
#ifdef CONFIG_HOTPLUG_CPU
#define CPU_KEEP(sec)    *(.cpu##sec)
#define CPU_DISCARD(sec)
#else
#define CPU_KEEP(sec)
#define CPU_DISCARD(sec) *(.cpu##sec)
#endif

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#if defined(CONFIG_MEMORY_HOTPLUG)
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#define MEM_KEEP(sec)    *(.mem##sec)
#define MEM_DISCARD(sec)
#else
#define MEM_KEEP(sec)
#define MEM_DISCARD(sec) *(.mem##sec)
#endif

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#ifdef CONFIG_FTRACE_MCOUNT_RECORD
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#define MCOUNT_REC()	. = ALIGN(8);				\
			VMLINUX_SYMBOL(__start_mcount_loc) = .; \
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			*(__mcount_loc)				\
			VMLINUX_SYMBOL(__stop_mcount_loc) = .;
#else
#define MCOUNT_REC()
#endif
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#ifdef CONFIG_TRACE_BRANCH_PROFILING
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#define LIKELY_PROFILE()	VMLINUX_SYMBOL(__start_annotated_branch_profile) = .; \
				*(_ftrace_annotated_branch)			      \
				VMLINUX_SYMBOL(__stop_annotated_branch_profile) = .;
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#else
#define LIKELY_PROFILE()
#endif

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#ifdef CONFIG_PROFILE_ALL_BRANCHES
#define BRANCH_PROFILE()	VMLINUX_SYMBOL(__start_branch_profile) = .;   \
				*(_ftrace_branch)			      \
				VMLINUX_SYMBOL(__stop_branch_profile) = .;
#else
#define BRANCH_PROFILE()
#endif

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#ifdef CONFIG_KPROBES
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#define KPROBE_BLACKLIST()	. = ALIGN(8);				      \
				VMLINUX_SYMBOL(__start_kprobe_blacklist) = .; \
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				*(_kprobe_blacklist)			      \
				VMLINUX_SYMBOL(__stop_kprobe_blacklist) = .;
#else
#define KPROBE_BLACKLIST()
#endif

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#ifdef CONFIG_EVENT_TRACING
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#define FTRACE_EVENTS()	. = ALIGN(8);					\
			VMLINUX_SYMBOL(__start_ftrace_events) = .;	\
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			*(_ftrace_events)				\
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			VMLINUX_SYMBOL(__stop_ftrace_events) = .;	\
			VMLINUX_SYMBOL(__start_ftrace_enum_maps) = .;	\
			*(_ftrace_enum_map)				\
			VMLINUX_SYMBOL(__stop_ftrace_enum_maps) = .;
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#else
#define FTRACE_EVENTS()
#endif

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#ifdef CONFIG_TRACING
#define TRACE_PRINTKS() VMLINUX_SYMBOL(__start___trace_bprintk_fmt) = .;      \
			 *(__trace_printk_fmt) /* Trace_printk fmt' pointer */ \
			 VMLINUX_SYMBOL(__stop___trace_bprintk_fmt) = .;
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#define TRACEPOINT_STR() VMLINUX_SYMBOL(__start___tracepoint_str) = .;	\
			 *(__tracepoint_str) /* Trace_printk fmt' pointer */ \
			 VMLINUX_SYMBOL(__stop___tracepoint_str) = .;
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#else
#define TRACE_PRINTKS()
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#define TRACEPOINT_STR()
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#endif

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#ifdef CONFIG_FTRACE_SYSCALLS
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#define TRACE_SYSCALLS() . = ALIGN(8);					\
			 VMLINUX_SYMBOL(__start_syscalls_metadata) = .;	\
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			 *(__syscalls_metadata)				\
			 VMLINUX_SYMBOL(__stop_syscalls_metadata) = .;
#else
#define TRACE_SYSCALLS()
#endif

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#ifdef CONFIG_SERIAL_EARLYCON
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#define EARLYCON_TABLE() STRUCT_ALIGN();			\
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			 VMLINUX_SYMBOL(__earlycon_table) = .;	\
			 *(__earlycon_table)			\
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			 VMLINUX_SYMBOL(__earlycon_table_end) = .;
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#else
#define EARLYCON_TABLE()
#endif
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#define ___OF_TABLE(cfg, name)	_OF_TABLE_##cfg(name)
#define __OF_TABLE(cfg, name)	___OF_TABLE(cfg, name)
#define OF_TABLE(cfg, name)	__OF_TABLE(config_enabled(cfg), name)
#define _OF_TABLE_0(name)
#define _OF_TABLE_1(name)						\
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	. = ALIGN(8);							\
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	VMLINUX_SYMBOL(__##name##_of_table) = .;			\
	*(__##name##_of_table)						\
	*(__##name##_of_table_end)

#define CLKSRC_OF_TABLES()	OF_TABLE(CONFIG_CLKSRC_OF, clksrc)
#define IRQCHIP_OF_MATCH_TABLE() OF_TABLE(CONFIG_IRQCHIP, irqchip)
#define CLK_OF_TABLES()		OF_TABLE(CONFIG_COMMON_CLK, clk)
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#define IOMMU_OF_TABLES()	OF_TABLE(CONFIG_OF_IOMMU, iommu)
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#define RESERVEDMEM_OF_TABLES()	OF_TABLE(CONFIG_OF_RESERVED_MEM, reservedmem)
#define CPU_METHOD_OF_TABLES()	OF_TABLE(CONFIG_SMP, cpu_method)
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#define CPUIDLE_METHOD_OF_TABLES() OF_TABLE(CONFIG_CPU_IDLE, cpuidle_method)
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#ifdef CONFIG_ACPI
#define ACPI_PROBE_TABLE(name)						\
	. = ALIGN(8);							\
	VMLINUX_SYMBOL(__##name##_acpi_probe_table) = .;		\
	*(__##name##_acpi_probe_table)					\
	VMLINUX_SYMBOL(__##name##_acpi_probe_table_end) = .;
#else
#define ACPI_PROBE_TABLE(name)
#endif

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#define KERNEL_DTB()							\
	STRUCT_ALIGN();							\
	VMLINUX_SYMBOL(__dtb_start) = .;				\
	*(.dtb.init.rodata)						\
	VMLINUX_SYMBOL(__dtb_end) = .;

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/* .data section */
#define DATA_DATA							\
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	*(.data)							\
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	*(.ref.data)							\
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	*(.data..shared_aligned) /* percpu related */			\
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	MEM_KEEP(init.data)						\
	MEM_KEEP(exit.data)						\
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	*(.data.unlikely)						\
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	STRUCT_ALIGN();							\
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	*(__tracepoints)						\
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	/* implement dynamic printk debug */				\
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	. = ALIGN(8);                                                   \
	VMLINUX_SYMBOL(__start___jump_table) = .;                       \
	*(__jump_table)                                                 \
	VMLINUX_SYMBOL(__stop___jump_table) = .;                        \
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	. = ALIGN(8);							\
	VMLINUX_SYMBOL(__start___verbose) = .;                          \
	*(__verbose)                                                    \
	VMLINUX_SYMBOL(__stop___verbose) = .;				\
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	LIKELY_PROFILE()		       				\
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	BRANCH_PROFILE()						\
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	TRACE_PRINTKS()							\
	TRACEPOINT_STR()
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/*
 * Data section helpers
 */
#define NOSAVE_DATA							\
	. = ALIGN(PAGE_SIZE);						\
	VMLINUX_SYMBOL(__nosave_begin) = .;				\
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	*(.data..nosave)						\
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	. = ALIGN(PAGE_SIZE);						\
	VMLINUX_SYMBOL(__nosave_end) = .;

#define PAGE_ALIGNED_DATA(page_align)					\
	. = ALIGN(page_align);						\
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	*(.data..page_aligned)
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#define READ_MOSTLY_DATA(align)						\
	. = ALIGN(align);						\
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	*(.data..read_mostly)						\
	. = ALIGN(align);
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#define CACHELINE_ALIGNED_DATA(align)					\
	. = ALIGN(align);						\
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	*(.data..cacheline_aligned)
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#define INIT_TASK_DATA(align)						\
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	. = ALIGN(align);						\
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	VMLINUX_SYMBOL(__start_init_task) = .;				\
	*(.data..init_task)						\
	VMLINUX_SYMBOL(__end_init_task) = .;
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/*
 * Read only Data
 */
#define RO_DATA_SECTION(align)						\
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	. = ALIGN((align));						\
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	.rodata           : AT(ADDR(.rodata) - LOAD_OFFSET) {		\
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		VMLINUX_SYMBOL(__start_rodata) = .;			\
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		*(.rodata) *(.rodata.*)					\
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		*(.data..ro_after_init)	/* Read only after init */	\
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		*(__vermagic)		/* Kernel version magic */	\
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		. = ALIGN(8);						\
		VMLINUX_SYMBOL(__start___tracepoints_ptrs) = .;		\
		*(__tracepoints_ptrs)	/* Tracepoints: pointer array */\
		VMLINUX_SYMBOL(__stop___tracepoints_ptrs) = .;		\
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		*(__tracepoints_strings)/* Tracepoints: strings */	\
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	}								\
									\
	.rodata1          : AT(ADDR(.rodata1) - LOAD_OFFSET) {		\
		*(.rodata1)						\
	}								\
									\
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	BUG_TABLE							\
									\
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	/* PCI quirks */						\
	.pci_fixup        : AT(ADDR(.pci_fixup) - LOAD_OFFSET) {	\
		VMLINUX_SYMBOL(__start_pci_fixups_early) = .;		\
		*(.pci_fixup_early)					\
		VMLINUX_SYMBOL(__end_pci_fixups_early) = .;		\
		VMLINUX_SYMBOL(__start_pci_fixups_header) = .;		\
		*(.pci_fixup_header)					\
		VMLINUX_SYMBOL(__end_pci_fixups_header) = .;		\
		VMLINUX_SYMBOL(__start_pci_fixups_final) = .;		\
		*(.pci_fixup_final)					\
		VMLINUX_SYMBOL(__end_pci_fixups_final) = .;		\
		VMLINUX_SYMBOL(__start_pci_fixups_enable) = .;		\
		*(.pci_fixup_enable)					\
		VMLINUX_SYMBOL(__end_pci_fixups_enable) = .;		\
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		VMLINUX_SYMBOL(__start_pci_fixups_resume) = .;		\
		*(.pci_fixup_resume)					\
		VMLINUX_SYMBOL(__end_pci_fixups_resume) = .;		\
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		VMLINUX_SYMBOL(__start_pci_fixups_resume_early) = .;	\
		*(.pci_fixup_resume_early)				\
		VMLINUX_SYMBOL(__end_pci_fixups_resume_early) = .;	\
		VMLINUX_SYMBOL(__start_pci_fixups_suspend) = .;		\
		*(.pci_fixup_suspend)					\
		VMLINUX_SYMBOL(__end_pci_fixups_suspend) = .;		\
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		VMLINUX_SYMBOL(__start_pci_fixups_suspend_late) = .;	\
		*(.pci_fixup_suspend_late)				\
		VMLINUX_SYMBOL(__end_pci_fixups_suspend_late) = .;	\
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	}								\
									\
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	/* Built-in firmware blobs */					\
	.builtin_fw        : AT(ADDR(.builtin_fw) - LOAD_OFFSET) {	\
		VMLINUX_SYMBOL(__start_builtin_fw) = .;			\
		*(.builtin_fw)						\
		VMLINUX_SYMBOL(__end_builtin_fw) = .;			\
	}								\
									\
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	TRACEDATA							\
									\
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	/* Kernel symbol table: Normal symbols */			\
	__ksymtab         : AT(ADDR(__ksymtab) - LOAD_OFFSET) {		\
		VMLINUX_SYMBOL(__start___ksymtab) = .;			\
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		*(SORT(___ksymtab+*))					\
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		VMLINUX_SYMBOL(__stop___ksymtab) = .;			\
	}								\
									\
	/* Kernel symbol table: GPL-only symbols */			\
	__ksymtab_gpl     : AT(ADDR(__ksymtab_gpl) - LOAD_OFFSET) {	\
		VMLINUX_SYMBOL(__start___ksymtab_gpl) = .;		\
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		*(SORT(___ksymtab_gpl+*))				\
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		VMLINUX_SYMBOL(__stop___ksymtab_gpl) = .;		\
	}								\
									\
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	/* Kernel symbol table: Normal unused symbols */		\
	__ksymtab_unused  : AT(ADDR(__ksymtab_unused) - LOAD_OFFSET) {	\
		VMLINUX_SYMBOL(__start___ksymtab_unused) = .;		\
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		*(SORT(___ksymtab_unused+*))				\
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		VMLINUX_SYMBOL(__stop___ksymtab_unused) = .;		\
	}								\
									\
	/* Kernel symbol table: GPL-only unused symbols */		\
	__ksymtab_unused_gpl : AT(ADDR(__ksymtab_unused_gpl) - LOAD_OFFSET) { \
		VMLINUX_SYMBOL(__start___ksymtab_unused_gpl) = .;	\
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		*(SORT(___ksymtab_unused_gpl+*))			\
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		VMLINUX_SYMBOL(__stop___ksymtab_unused_gpl) = .;	\
	}								\
									\
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	/* Kernel symbol table: GPL-future-only symbols */		\
	__ksymtab_gpl_future : AT(ADDR(__ksymtab_gpl_future) - LOAD_OFFSET) { \
		VMLINUX_SYMBOL(__start___ksymtab_gpl_future) = .;	\
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		*(SORT(___ksymtab_gpl_future+*))			\
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		VMLINUX_SYMBOL(__stop___ksymtab_gpl_future) = .;	\
	}								\
									\
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	/* Kernel symbol table: Normal symbols */			\
	__kcrctab         : AT(ADDR(__kcrctab) - LOAD_OFFSET) {		\
		VMLINUX_SYMBOL(__start___kcrctab) = .;			\
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		*(SORT(___kcrctab+*))					\
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		VMLINUX_SYMBOL(__stop___kcrctab) = .;			\
	}								\
									\
	/* Kernel symbol table: GPL-only symbols */			\
	__kcrctab_gpl     : AT(ADDR(__kcrctab_gpl) - LOAD_OFFSET) {	\
		VMLINUX_SYMBOL(__start___kcrctab_gpl) = .;		\
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		*(SORT(___kcrctab_gpl+*))				\
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		VMLINUX_SYMBOL(__stop___kcrctab_gpl) = .;		\
	}								\
									\
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	/* Kernel symbol table: Normal unused symbols */		\
	__kcrctab_unused  : AT(ADDR(__kcrctab_unused) - LOAD_OFFSET) {	\
		VMLINUX_SYMBOL(__start___kcrctab_unused) = .;		\
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		*(SORT(___kcrctab_unused+*))				\
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		VMLINUX_SYMBOL(__stop___kcrctab_unused) = .;		\
	}								\
									\
	/* Kernel symbol table: GPL-only unused symbols */		\
	__kcrctab_unused_gpl : AT(ADDR(__kcrctab_unused_gpl) - LOAD_OFFSET) { \
		VMLINUX_SYMBOL(__start___kcrctab_unused_gpl) = .;	\
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		*(SORT(___kcrctab_unused_gpl+*))			\
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		VMLINUX_SYMBOL(__stop___kcrctab_unused_gpl) = .;	\
	}								\
									\
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	/* Kernel symbol table: GPL-future-only symbols */		\
	__kcrctab_gpl_future : AT(ADDR(__kcrctab_gpl_future) - LOAD_OFFSET) { \
		VMLINUX_SYMBOL(__start___kcrctab_gpl_future) = .;	\
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		*(SORT(___kcrctab_gpl_future+*))			\
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		VMLINUX_SYMBOL(__stop___kcrctab_gpl_future) = .;	\
	}								\
									\
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	/* Kernel symbol table: strings */				\
        __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) {	\
		*(__ksymtab_strings)					\
	}								\
									\
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	/* __*init sections */						\
	__init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) {		\
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		*(.ref.rodata)						\
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		MEM_KEEP(init.rodata)					\
		MEM_KEEP(exit.rodata)					\
	}								\
									\
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	/* Built-in module parameters. */				\
	__param : AT(ADDR(__param) - LOAD_OFFSET) {			\
		VMLINUX_SYMBOL(__start___param) = .;			\
		*(__param)						\
		VMLINUX_SYMBOL(__stop___param) = .;			\
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	}								\
									\
	/* Built-in module versions. */					\
	__modver : AT(ADDR(__modver) - LOAD_OFFSET) {			\
		VMLINUX_SYMBOL(__start___modver) = .;			\
		*(__modver)						\
		VMLINUX_SYMBOL(__stop___modver) = .;			\
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		. = ALIGN((align));					\
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		VMLINUX_SYMBOL(__end_rodata) = .;			\
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	}								\
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	. = ALIGN((align));

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/* RODATA & RO_DATA provided for backward compatibility.
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 * All archs are supposed to use RO_DATA() */
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#define RODATA          RO_DATA_SECTION(4096)
#define RO_DATA(align)  RO_DATA_SECTION(align)
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#define SECURITY_INIT							\
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	.security_initcall.init : AT(ADDR(.security_initcall.init) - LOAD_OFFSET) { \
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		VMLINUX_SYMBOL(__security_initcall_start) = .;		\
		*(.security_initcall.init) 				\
		VMLINUX_SYMBOL(__security_initcall_end) = .;		\
	}

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/* .text section. Map to function alignment to avoid address changes
 * during second ld run in second ld pass when generating System.map */
#define TEXT_TEXT							\
		ALIGN_FUNCTION();					\
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		*(.text.hot .text .text.fixup .text.unlikely)		\
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		*(.ref.text)						\
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	MEM_KEEP(init.text)						\
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	MEM_KEEP(exit.text)						\
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/* sched.text is aling to function alignment to secure we have same
 * address even at second ld pass when generating System.map */
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#define SCHED_TEXT							\
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		ALIGN_FUNCTION();					\
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		VMLINUX_SYMBOL(__sched_text_start) = .;			\
		*(.sched.text)						\
		VMLINUX_SYMBOL(__sched_text_end) = .;

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/* spinlock.text is aling to function alignment to secure we have same
 * address even at second ld pass when generating System.map */
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#define LOCK_TEXT							\
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		ALIGN_FUNCTION();					\
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		VMLINUX_SYMBOL(__lock_text_start) = .;			\
		*(.spinlock.text)					\
		VMLINUX_SYMBOL(__lock_text_end) = .;
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#define KPROBES_TEXT							\
		ALIGN_FUNCTION();					\
		VMLINUX_SYMBOL(__kprobes_text_start) = .;		\
		*(.kprobes.text)					\
		VMLINUX_SYMBOL(__kprobes_text_end) = .;
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#define ENTRY_TEXT							\
		ALIGN_FUNCTION();					\
		VMLINUX_SYMBOL(__entry_text_start) = .;			\
		*(.entry.text)						\
		VMLINUX_SYMBOL(__entry_text_end) = .;

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#if defined(CONFIG_FUNCTION_GRAPH_TRACER) || defined(CONFIG_KASAN)
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#define IRQENTRY_TEXT							\
		ALIGN_FUNCTION();					\
		VMLINUX_SYMBOL(__irqentry_text_start) = .;		\
		*(.irqentry.text)					\
		VMLINUX_SYMBOL(__irqentry_text_end) = .;
#else
#define IRQENTRY_TEXT
#endif

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#if defined(CONFIG_FUNCTION_GRAPH_TRACER) || defined(CONFIG_KASAN)
#define SOFTIRQENTRY_TEXT						\
		ALIGN_FUNCTION();					\
		VMLINUX_SYMBOL(__softirqentry_text_start) = .;		\
		*(.softirqentry.text)					\
		VMLINUX_SYMBOL(__softirqentry_text_end) = .;
#else
#define SOFTIRQENTRY_TEXT
#endif

481
/* Section used for early init (in .S files) */
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#define HEAD_TEXT  *(.head.text)
483

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#define HEAD_TEXT_SECTION							\
485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502
	.head.text : AT(ADDR(.head.text) - LOAD_OFFSET) {		\
		HEAD_TEXT						\
	}

/*
 * Exception table
 */
#define EXCEPTION_TABLE(align)						\
	. = ALIGN(align);						\
	__ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) {		\
		VMLINUX_SYMBOL(__start___ex_table) = .;			\
		*(__ex_table)						\
		VMLINUX_SYMBOL(__stop___ex_table) = .;			\
	}

/*
 * Init task
 */
503
#define INIT_TASK_DATA_SECTION(align)					\
504
	. = ALIGN(align);						\
505
	.data..init_task :  AT(ADDR(.data..init_task) - LOAD_OFFSET) {	\
506
		INIT_TASK_DATA(align)					\
507
	}
508

509
#ifdef CONFIG_CONSTRUCTORS
510 511
#define KERNEL_CTORS()	. = ALIGN(8);			   \
			VMLINUX_SYMBOL(__ctors_start) = .; \
512
			*(.ctors)			   \
513
			*(SORT(.init_array.*))		   \
514
			*(.init_array)			   \
515 516 517 518 519
			VMLINUX_SYMBOL(__ctors_end) = .;
#else
#define KERNEL_CTORS()
#endif

520
/* init and exit section handling */
521 522 523
#define INIT_DATA							\
	*(.init.data)							\
	MEM_DISCARD(init.data)						\
524
	KERNEL_CTORS()							\
525
	MCOUNT_REC()							\
526
	*(.init.rodata)							\
527
	FTRACE_EVENTS()							\
528
	TRACE_SYSCALLS()						\
529
	KPROBE_BLACKLIST()						\
530
	MEM_DISCARD(init.rodata)					\
531
	CLK_OF_TABLES()							\
532
	RESERVEDMEM_OF_TABLES()						\
533
	CLKSRC_OF_TABLES()						\
534
	IOMMU_OF_TABLES()						\
535
	CPU_METHOD_OF_TABLES()						\
536
	CPUIDLE_METHOD_OF_TABLES()					\
537
	KERNEL_DTB()							\
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	IRQCHIP_OF_MATCH_TABLE()					\
539
	ACPI_PROBE_TABLE(irqchip)					\
540
	ACPI_PROBE_TABLE(clksrc)					\
541
	EARLYCON_TABLE()
542 543 544 545 546 547 548 549 550

#define INIT_TEXT							\
	*(.init.text)							\
	MEM_DISCARD(init.text)

#define EXIT_DATA							\
	*(.exit.data)							\
	MEM_DISCARD(exit.data)						\
	MEM_DISCARD(exit.rodata)
551

552 553 554
#define EXIT_TEXT							\
	*(.exit.text)							\
	MEM_DISCARD(exit.text)
555

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#define EXIT_CALL							\
	*(.exitcall.exit)

559 560 561 562
/*
 * bss (Block Started by Symbol) - uninitialized data
 * zeroed during startup
 */
563 564
#define SBSS(sbss_align)						\
	. = ALIGN(sbss_align);						\
565 566 567 568 569
	.sbss : AT(ADDR(.sbss) - LOAD_OFFSET) {				\
		*(.sbss)						\
		*(.scommon)						\
	}

570 571 572 573 574 575 576 577
/*
 * Allow archectures to redefine BSS_FIRST_SECTIONS to add extra
 * sections to the front of bss.
 */
#ifndef BSS_FIRST_SECTIONS
#define BSS_FIRST_SECTIONS
#endif

578 579 580
#define BSS(bss_align)							\
	. = ALIGN(bss_align);						\
	.bss : AT(ADDR(.bss) - LOAD_OFFSET) {				\
581
		BSS_FIRST_SECTIONS					\
582
		*(.bss..page_aligned)					\
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		*(.dynbss)						\
		*(.bss)							\
		*(COMMON)						\
	}

/*
 * DWARF debug sections.
 * Symbols in the DWARF debugging sections are relative to
 * the beginning of the section so we begin them at 0.
 */
593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626
#define DWARF_DEBUG							\
		/* DWARF 1 */						\
		.debug          0 : { *(.debug) }			\
		.line           0 : { *(.line) }			\
		/* GNU DWARF 1 extensions */				\
		.debug_srcinfo  0 : { *(.debug_srcinfo) }		\
		.debug_sfnames  0 : { *(.debug_sfnames) }		\
		/* DWARF 1.1 and DWARF 2 */				\
		.debug_aranges  0 : { *(.debug_aranges) }		\
		.debug_pubnames 0 : { *(.debug_pubnames) }		\
		/* DWARF 2 */						\
		.debug_info     0 : { *(.debug_info			\
				.gnu.linkonce.wi.*) }			\
		.debug_abbrev   0 : { *(.debug_abbrev) }		\
		.debug_line     0 : { *(.debug_line) }			\
		.debug_frame    0 : { *(.debug_frame) }			\
		.debug_str      0 : { *(.debug_str) }			\
		.debug_loc      0 : { *(.debug_loc) }			\
		.debug_macinfo  0 : { *(.debug_macinfo) }		\
		/* SGI/MIPS DWARF 2 extensions */			\
		.debug_weaknames 0 : { *(.debug_weaknames) }		\
		.debug_funcnames 0 : { *(.debug_funcnames) }		\
		.debug_typenames 0 : { *(.debug_typenames) }		\
		.debug_varnames  0 : { *(.debug_varnames) }		\

		/* Stabs debugging sections.  */
#define STABS_DEBUG							\
		.stab 0 : { *(.stab) }					\
		.stabstr 0 : { *(.stabstr) }				\
		.stab.excl 0 : { *(.stab.excl) }			\
		.stab.exclstr 0 : { *(.stab.exclstr) }			\
		.stab.index 0 : { *(.stab.index) }			\
		.stab.indexstr 0 : { *(.stab.indexstr) }		\
		.comment 0 : { *(.comment) }
627

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#ifdef CONFIG_GENERIC_BUG
629 630 631
#define BUG_TABLE							\
	. = ALIGN(8);							\
	__bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) {		\
632
		VMLINUX_SYMBOL(__start___bug_table) = .;		\
633
		*(__bug_table)						\
634
		VMLINUX_SYMBOL(__stop___bug_table) = .;			\
635
	}
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#else
#define BUG_TABLE
#endif
639

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#ifdef CONFIG_PM_TRACE
#define TRACEDATA							\
	. = ALIGN(4);							\
	.tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) {		\
644
		VMLINUX_SYMBOL(__tracedata_start) = .;			\
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		*(.tracedata)						\
646
		VMLINUX_SYMBOL(__tracedata_end) = .;			\
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	}
#else
#define TRACEDATA
#endif

652
#define NOTES								\
653 654 655 656 657
	.notes : AT(ADDR(.notes) - LOAD_OFFSET) {			\
		VMLINUX_SYMBOL(__start_notes) = .;			\
		*(.note.*)						\
		VMLINUX_SYMBOL(__stop_notes) = .;			\
	}
658

659 660 661 662 663 664
#define INIT_SETUP(initsetup_align)					\
		. = ALIGN(initsetup_align);				\
		VMLINUX_SYMBOL(__setup_start) = .;			\
		*(.init.setup)						\
		VMLINUX_SYMBOL(__setup_end) = .;

665 666 667 668
#define INIT_CALLS_LEVEL(level)						\
		VMLINUX_SYMBOL(__initcall##level##_start) = .;		\
		*(.initcall##level##.init)				\
		*(.initcall##level##s.init)				\
669

670 671
#define INIT_CALLS							\
		VMLINUX_SYMBOL(__initcall_start) = .;			\
672 673 674 675 676 677 678 679 680 681
		*(.initcallearly.init)					\
		INIT_CALLS_LEVEL(0)					\
		INIT_CALLS_LEVEL(1)					\
		INIT_CALLS_LEVEL(2)					\
		INIT_CALLS_LEVEL(3)					\
		INIT_CALLS_LEVEL(4)					\
		INIT_CALLS_LEVEL(5)					\
		INIT_CALLS_LEVEL(rootfs)				\
		INIT_CALLS_LEVEL(6)					\
		INIT_CALLS_LEVEL(7)					\
682 683 684 685 686 687 688 689 690 691 692 693 694 695
		VMLINUX_SYMBOL(__initcall_end) = .;

#define CON_INITCALL							\
		VMLINUX_SYMBOL(__con_initcall_start) = .;		\
		*(.con_initcall.init)					\
		VMLINUX_SYMBOL(__con_initcall_end) = .;

#define SECURITY_INITCALL						\
		VMLINUX_SYMBOL(__security_initcall_start) = .;		\
		*(.security_initcall.init)				\
		VMLINUX_SYMBOL(__security_initcall_end) = .;

#ifdef CONFIG_BLK_DEV_INITRD
#define INIT_RAM_FS							\
696
	. = ALIGN(4);							\
697 698
	VMLINUX_SYMBOL(__initramfs_start) = .;				\
	*(.init.ramfs)							\
699 700
	. = ALIGN(8);							\
	*(.init.ramfs.info)
701
#else
702
#define INIT_RAM_FS
703 704
#endif

705 706 707 708 709 710 711 712 713
/*
 * Default discarded sections.
 *
 * Some archs want to discard exit text/data at runtime rather than
 * link time due to cross-section references such as alt instructions,
 * bug table, eh_frame, etc.  DISCARDS must be the last of output
 * section definitions so that such archs put those in earlier section
 * definitions.
 */
714 715 716 717
#define DISCARDS							\
	/DISCARD/ : {							\
	EXIT_TEXT							\
	EXIT_DATA							\
718
	EXIT_CALL							\
719
	*(.discard)							\
720
	*(.discard.*)							\
721 722
	}

723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738
/**
 * PERCPU_INPUT - the percpu input sections
 * @cacheline: cacheline size
 *
 * The core percpu section names and core symbols which do not rely
 * directly upon load addresses.
 *
 * @cacheline is used to align subsections to avoid false cacheline
 * sharing between subsections for different purposes.
 */
#define PERCPU_INPUT(cacheline)						\
	VMLINUX_SYMBOL(__per_cpu_start) = .;				\
	*(.data..percpu..first)						\
	. = ALIGN(PAGE_SIZE);						\
	*(.data..percpu..page_aligned)					\
	. = ALIGN(cacheline);						\
739
	*(.data..percpu..read_mostly)					\
740 741 742 743 744
	. = ALIGN(cacheline);						\
	*(.data..percpu)						\
	*(.data..percpu..shared_aligned)				\
	VMLINUX_SYMBOL(__per_cpu_end) = .;

745
/**
746
 * PERCPU_VADDR - define output section for percpu area
747
 * @cacheline: cacheline size
748 749 750
 * @vaddr: explicit base address (optional)
 * @phdr: destination PHDR (optional)
 *
751 752 753 754 755 756 757 758
 * Macro which expands to output section for percpu area.
 *
 * @cacheline is used to align subsections to avoid false cacheline
 * sharing between subsections for different purposes.
 *
 * If @vaddr is not blank, it specifies explicit base address and all
 * percpu symbols will be offset from the given address.  If blank,
 * @vaddr always equals @laddr + LOAD_OFFSET.
759 760 761 762 763 764
 *
 * @phdr defines the output PHDR to use if not blank.  Be warned that
 * output PHDR is sticky.  If @phdr is specified, the next output
 * section in the linker script will go there too.  @phdr should have
 * a leading colon.
 *
765 766
 * Note that this macros defines __per_cpu_load as an absolute symbol.
 * If there is no need to put the percpu section at a predetermined
767
 * address, use PERCPU_SECTION.
768
 */
769
#define PERCPU_VADDR(cacheline, vaddr, phdr)				\
770
	VMLINUX_SYMBOL(__per_cpu_load) = .;				\
771
	.data..percpu vaddr : AT(VMLINUX_SYMBOL(__per_cpu_load)		\
772
				- LOAD_OFFSET) {			\
773
		PERCPU_INPUT(cacheline)					\
774
	} phdr								\
775
	. = VMLINUX_SYMBOL(__per_cpu_load) + SIZEOF(.data..percpu);
776 777

/**
778
 * PERCPU_SECTION - define output section for percpu area, simple version
779
 * @cacheline: cacheline size
780
 *
781 782
 * Align to PAGE_SIZE and outputs output section for percpu area.  This
 * macro doesn't manipulate @vaddr or @phdr and __per_cpu_load and
783
 * __per_cpu_start will be identical.
784
 *
785
 * This macro is equivalent to ALIGN(PAGE_SIZE); PERCPU_VADDR(@cacheline,,)
786 787
 * except that __per_cpu_load is defined as a relative symbol against
 * .data..percpu which is required for relocatable x86_32 configuration.
788
 */
789 790
#define PERCPU_SECTION(cacheline)					\
	. = ALIGN(PAGE_SIZE);						\
791
	.data..percpu	: AT(ADDR(.data..percpu) - LOAD_OFFSET) {	\
792
		VMLINUX_SYMBOL(__per_cpu_load) = .;			\
793
		PERCPU_INPUT(cacheline)					\
794
	}
795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811


/*
 * Definition of the high level *_SECTION macros
 * They will fit only a subset of the architectures
 */


/*
 * Writeable data.
 * All sections are combined in a single .data section.
 * The sections following CONSTRUCTORS are arranged so their
 * typical alignment matches.
 * A cacheline is typical/always less than a PAGE_SIZE so
 * the sections that has this restriction (or similar)
 * is located before the ones requiring PAGE_SIZE alignment.
 * NOSAVE_DATA starts and ends with a PAGE_SIZE alignment which
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Lucas De Marchi 已提交
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 * matches the requirement of PAGE_ALIGNED_DATA.
813
 *
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Sam Ravnborg 已提交
814
 * use 0 as page_align if page_aligned data is not used */
815
#define RW_DATA_SECTION(cacheline, pagealigned, inittask)		\
816 817
	. = ALIGN(PAGE_SIZE);						\
	.data : AT(ADDR(.data) - LOAD_OFFSET) {				\
818
		INIT_TASK_DATA(inittask)				\
819 820
		NOSAVE_DATA						\
		PAGE_ALIGNED_DATA(pagealigned)				\
821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844
		CACHELINE_ALIGNED_DATA(cacheline)			\
		READ_MOSTLY_DATA(cacheline)				\
		DATA_DATA						\
		CONSTRUCTORS						\
	}

#define INIT_TEXT_SECTION(inittext_align)				\
	. = ALIGN(inittext_align);					\
	.init.text : AT(ADDR(.init.text) - LOAD_OFFSET) {		\
		VMLINUX_SYMBOL(_sinittext) = .;				\
		INIT_TEXT						\
		VMLINUX_SYMBOL(_einittext) = .;				\
	}

#define INIT_DATA_SECTION(initsetup_align)				\
	.init.data : AT(ADDR(.init.data) - LOAD_OFFSET) {		\
		INIT_DATA						\
		INIT_SETUP(initsetup_align)				\
		INIT_CALLS						\
		CON_INITCALL						\
		SECURITY_INITCALL					\
		INIT_RAM_FS						\
	}

845 846 847 848
#define BSS_SECTION(sbss_align, bss_align, stop_align)			\
	. = ALIGN(sbss_align);						\
	VMLINUX_SYMBOL(__bss_start) = .;				\
	SBSS(sbss_align)						\
849
	BSS(bss_align)							\
850 851
	. = ALIGN(stop_align);						\
	VMLINUX_SYMBOL(__bss_stop) = .;