vmlinux.lds.h 24.2 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
 * [_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
#define KPROBE_BLACKLIST()	VMLINUX_SYMBOL(__start_kprobe_blacklist) = .; \
				*(_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)				\
			VMLINUX_SYMBOL(__stop_ftrace_events) = .;
#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_CLKSRC_OF
#define CLKSRC_OF_TABLES() . = ALIGN(8);				\
			   VMLINUX_SYMBOL(__clksrc_of_table) = .;	\
			   *(__clksrc_of_table)				\
			   *(__clksrc_of_table_end)
#else
#define CLKSRC_OF_TABLES()
#endif
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#ifdef CONFIG_IRQCHIP
#define IRQCHIP_OF_MATCH_TABLE()					\
	. = ALIGN(8);							\
	VMLINUX_SYMBOL(__irqchip_begin) = .;				\
	*(__irqchip_of_table)		  				\
	*(__irqchip_of_end)
#else
#define IRQCHIP_OF_MATCH_TABLE()
#endif
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#ifdef CONFIG_COMMON_CLK
#define CLK_OF_TABLES() . = ALIGN(8);				\
			VMLINUX_SYMBOL(__clk_of_table) = .;	\
			*(__clk_of_table)			\
			*(__clk_of_table_end)
#else
#define CLK_OF_TABLES()
#endif

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#ifdef CONFIG_OF_RESERVED_MEM
#define RESERVEDMEM_OF_TABLES()				\
	. = ALIGN(8);					\
	VMLINUX_SYMBOL(__reservedmem_of_table) = .;	\
	*(__reservedmem_of_table)			\
	*(__reservedmem_of_table_end)
#else
#define RESERVEDMEM_OF_TABLES()
#endif

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#ifdef CONFIG_SMP
#define CPU_METHOD_OF_TABLES() . = ALIGN(8);				    \
			   VMLINUX_SYMBOL(__cpu_method_of_table_begin) = .; \
			   *(__cpu_method_of_table)			    \
			   VMLINUX_SYMBOL(__cpu_method_of_table_end) = .;
#else
#define CPU_METHOD_OF_TABLES()
#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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	*(.data..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.*)					\
		*(__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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	}								\
									\
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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)						\
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		*(.text)						\
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		*(.ref.text)						\
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	MEM_KEEP(init.text)						\
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	MEM_KEEP(exit.text)						\
		*(.text.unlikely)
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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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#ifdef CONFIG_FUNCTION_GRAPH_TRACER
#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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/* Section used for early init (in .S files) */
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#define HEAD_TEXT  *(.head.text)
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#define HEAD_TEXT_SECTION							\
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	.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
 */
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#define INIT_TASK_DATA_SECTION(align)					\
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	. = ALIGN(align);						\
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	.data..init_task :  AT(ADDR(.data..init_task) - LOAD_OFFSET) {	\
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		INIT_TASK_DATA(align)					\
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	}
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#ifdef CONFIG_CONSTRUCTORS
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#define KERNEL_CTORS()	. = ALIGN(8);			   \
			VMLINUX_SYMBOL(__ctors_start) = .; \
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			*(.ctors)			   \
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			*(.init_array)			   \
504 505 506 507 508
			VMLINUX_SYMBOL(__ctors_end) = .;
#else
#define KERNEL_CTORS()
#endif

509
/* init and exit section handling */
510 511 512
#define INIT_DATA							\
	*(.init.data)							\
	MEM_DISCARD(init.data)						\
513
	KERNEL_CTORS()							\
514
	MCOUNT_REC()							\
515
	*(.init.rodata)							\
516
	FTRACE_EVENTS()							\
517
	TRACE_SYSCALLS()						\
518
	KPROBE_BLACKLIST()						\
519
	MEM_DISCARD(init.rodata)					\
520
	CLK_OF_TABLES()							\
521
	RESERVEDMEM_OF_TABLES()						\
522
	CLKSRC_OF_TABLES()						\
523
	CPU_METHOD_OF_TABLES()						\
524 525
	KERNEL_DTB()							\
	IRQCHIP_OF_MATCH_TABLE()
526 527 528 529 530 531 532 533 534

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

#define EXIT_DATA							\
	*(.exit.data)							\
	MEM_DISCARD(exit.data)						\
	MEM_DISCARD(exit.rodata)
535

536 537 538
#define EXIT_TEXT							\
	*(.exit.text)							\
	MEM_DISCARD(exit.text)
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#define EXIT_CALL							\
	*(.exitcall.exit)

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/*
 * bss (Block Started by Symbol) - uninitialized data
 * zeroed during startup
 */
547 548
#define SBSS(sbss_align)						\
	. = ALIGN(sbss_align);						\
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	.sbss : AT(ADDR(.sbss) - LOAD_OFFSET) {				\
		*(.sbss)						\
		*(.scommon)						\
	}

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/*
 * 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

562 563 564
#define BSS(bss_align)							\
	. = ALIGN(bss_align);						\
	.bss : AT(ADDR(.bss) - LOAD_OFFSET) {				\
565
		BSS_FIRST_SECTIONS					\
566
		*(.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.
 */
577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610
#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) }
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#ifdef CONFIG_GENERIC_BUG
613 614 615
#define BUG_TABLE							\
	. = ALIGN(8);							\
	__bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) {		\
616
		VMLINUX_SYMBOL(__start___bug_table) = .;		\
617
		*(__bug_table)						\
618
		VMLINUX_SYMBOL(__stop___bug_table) = .;			\
619
	}
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#else
#define BUG_TABLE
#endif
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#ifdef CONFIG_PM_TRACE
#define TRACEDATA							\
	. = ALIGN(4);							\
	.tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) {		\
628
		VMLINUX_SYMBOL(__tracedata_start) = .;			\
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		*(.tracedata)						\
630
		VMLINUX_SYMBOL(__tracedata_end) = .;			\
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	}
#else
#define TRACEDATA
#endif

636
#define NOTES								\
637 638 639 640 641
	.notes : AT(ADDR(.notes) - LOAD_OFFSET) {			\
		VMLINUX_SYMBOL(__start_notes) = .;			\
		*(.note.*)						\
		VMLINUX_SYMBOL(__stop_notes) = .;			\
	}
642

643 644 645 646 647 648
#define INIT_SETUP(initsetup_align)					\
		. = ALIGN(initsetup_align);				\
		VMLINUX_SYMBOL(__setup_start) = .;			\
		*(.init.setup)						\
		VMLINUX_SYMBOL(__setup_end) = .;

649 650 651 652
#define INIT_CALLS_LEVEL(level)						\
		VMLINUX_SYMBOL(__initcall##level##_start) = .;		\
		*(.initcall##level##.init)				\
		*(.initcall##level##s.init)				\
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654 655
#define INIT_CALLS							\
		VMLINUX_SYMBOL(__initcall_start) = .;			\
656 657 658 659 660 661 662 663 664 665
		*(.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)					\
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		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							\
680
	. = ALIGN(4);							\
681 682
	VMLINUX_SYMBOL(__initramfs_start) = .;				\
	*(.init.ramfs)							\
683 684
	. = ALIGN(8);							\
	*(.init.ramfs.info)
685
#else
686
#define INIT_RAM_FS
687 688
#endif

689 690 691 692 693 694 695 696 697
/*
 * 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.
 */
698 699 700 701
#define DISCARDS							\
	/DISCARD/ : {							\
	EXIT_TEXT							\
	EXIT_DATA							\
702
	EXIT_CALL							\
703
	*(.discard)							\
704
	*(.discard.*)							\
705 706
	}

707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728
/**
 * 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);						\
	*(.data..percpu..readmostly)					\
	. = ALIGN(cacheline);						\
	*(.data..percpu)						\
	*(.data..percpu..shared_aligned)				\
	VMLINUX_SYMBOL(__per_cpu_end) = .;

729
/**
730
 * PERCPU_VADDR - define output section for percpu area
731
 * @cacheline: cacheline size
732 733 734
 * @vaddr: explicit base address (optional)
 * @phdr: destination PHDR (optional)
 *
735 736 737 738 739 740 741 742
 * 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.
743 744 745 746 747 748
 *
 * @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.
 *
749 750
 * 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
751
 * address, use PERCPU_SECTION.
752
 */
753
#define PERCPU_VADDR(cacheline, vaddr, phdr)				\
754
	VMLINUX_SYMBOL(__per_cpu_load) = .;				\
755
	.data..percpu vaddr : AT(VMLINUX_SYMBOL(__per_cpu_load)		\
756
				- LOAD_OFFSET) {			\
757
		PERCPU_INPUT(cacheline)					\
758
	} phdr								\
759
	. = VMLINUX_SYMBOL(__per_cpu_load) + SIZEOF(.data..percpu);
760 761

/**
762
 * PERCPU_SECTION - define output section for percpu area, simple version
763
 * @cacheline: cacheline size
764
 *
765 766
 * Align to PAGE_SIZE and outputs output section for percpu area.  This
 * macro doesn't manipulate @vaddr or @phdr and __per_cpu_load and
767
 * __per_cpu_start will be identical.
768
 *
769
 * This macro is equivalent to ALIGN(PAGE_SIZE); PERCPU_VADDR(@cacheline,,)
770 771
 * except that __per_cpu_load is defined as a relative symbol against
 * .data..percpu which is required for relocatable x86_32 configuration.
772
 */
773 774
#define PERCPU_SECTION(cacheline)					\
	. = ALIGN(PAGE_SIZE);						\
775
	.data..percpu	: AT(ADDR(.data..percpu) - LOAD_OFFSET) {	\
776
		VMLINUX_SYMBOL(__per_cpu_load) = .;			\
777
		PERCPU_INPUT(cacheline)					\
778
	}
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/*
 * 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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 * matches the requirement of PAGE_ALIGNED_DATA.
797
 *
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 * use 0 as page_align if page_aligned data is not used */
799
#define RW_DATA_SECTION(cacheline, pagealigned, inittask)		\
800 801
	. = ALIGN(PAGE_SIZE);						\
	.data : AT(ADDR(.data) - LOAD_OFFSET) {				\
802
		INIT_TASK_DATA(inittask)				\
803 804
		NOSAVE_DATA						\
		PAGE_ALIGNED_DATA(pagealigned)				\
805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828
		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						\
	}

829 830 831 832
#define BSS_SECTION(sbss_align, bss_align, stop_align)			\
	. = ALIGN(sbss_align);						\
	VMLINUX_SYMBOL(__bss_start) = .;				\
	SBSS(sbss_align)						\
833
	BSS(bss_align)							\
834 835
	. = ALIGN(stop_align);						\
	VMLINUX_SYMBOL(__bss_stop) = .;