linux-vybrid_public/arch/x86/kernel/vmlinux_32.lds.S

/* ld script to make i386 Linux kernel
 * Written by Martin Mares <mj@atrey.karlin.mff.cuni.cz>;
 *
 * Don't define absolute symbols until and unless you know that symbol
 * value is should remain constant even if kernel image is relocated
 * at run time. Absolute symbols are not relocated. If symbol value should
 * change if kernel is relocated, make the symbol section relative and
 * put it inside the section definition.
 */

#define LOAD_OFFSET __PAGE_OFFSET

#include <asm-generic/vmlinux.lds.h>
#include <asm/thread_info.h>
#include <asm/page_types.h>
#include <asm/cache.h>
#include <asm/boot.h>

OUTPUT_FORMAT("elf32-i386", "elf32-i386", "elf32-i386")
OUTPUT_ARCH(i386)
ENTRY(phys_startup_32)
jiffies = jiffies_64;

PHDRS {
	text PT_LOAD FLAGS(5);		/* R_E */
	data PT_LOAD FLAGS(7);		/* RWE */
	note PT_NOTE FLAGS(0);		/* ___ */
}
SECTIONS
{
	. = LOAD_OFFSET + LOAD_PHYSICAL_ADDR;
	phys_startup_32 = startup_32 - LOAD_OFFSET;

	/* Text and read-only data */
	.text.head : AT(ADDR(.text.head) - LOAD_OFFSET) {
		_text = .;
		*(.text.head)
	} :text = 0x9090

	/* read-only */
	.text : AT(ADDR(.text) - LOAD_OFFSET) {
		/* not really needed, already page aligned */
		. = ALIGN(PAGE_SIZE);
		*(.text.page_aligned)
		TEXT_TEXT
		SCHED_TEXT
		LOCK_TEXT
		KPROBES_TEXT
		IRQENTRY_TEXT
		*(.fixup)
		*(.gnu.warning)
		/* End of text section */
		_etext = .;
	} :text = 0x9090

	NOTES :text :note

	/* Exception table */
	. = ALIGN(16);
	__ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) {
		__start___ex_table = .;
		 *(__ex_table)
		__stop___ex_table = .;
	} :text = 0x9090

	RODATA

	/* writeable */
	. = ALIGN(PAGE_SIZE);
	/* Data */
	.data : AT(ADDR(.data) - LOAD_OFFSET) {
		DATA_DATA
		CONSTRUCTORS
	} :data

	. = ALIGN(PAGE_SIZE);
	.data_nosave : AT(ADDR(.data_nosave) - LOAD_OFFSET) {
		__nosave_begin = .;
		*(.data.nosave)
		. = ALIGN(PAGE_SIZE);
		__nosave_end = .;
	}

	. = ALIGN(PAGE_SIZE);
	.data.page_aligned : AT(ADDR(.data.page_aligned) - LOAD_OFFSET) {
		*(.data.page_aligned)
		*(.data.idt)
	}

	. = ALIGN(32);
	.data.cacheline_aligned :
		AT(ADDR(.data.cacheline_aligned) - LOAD_OFFSET) {
		*(.data.cacheline_aligned)
	}

	/* rarely changed data like cpu maps */
	. = ALIGN(32);
	.data.read_mostly : AT(ADDR(.data.read_mostly) - LOAD_OFFSET) {
		*(.data.read_mostly)

		/* End of data section */
		_edata = .;
	}

	/* init_task */
	. = ALIGN(THREAD_SIZE);
	.data.init_task : AT(ADDR(.data.init_task) - LOAD_OFFSET) {
		*(.data.init_task)
	}

	. = ALIGN(PAGE_SIZE);
	.smp_locks : AT(ADDR(.smp_locks) - LOAD_OFFSET) {
		/* might get freed after init */
		__smp_locks = .;
		*(.smp_locks)
		__smp_locks_end = .;
	}
	/* will be freed after init
	 * Following ALIGN() is required to make sure no other data falls on the
	 * same page where __smp_alt_end is pointing as that page might be freed
	 * after boot. Always make sure that ALIGN() directive is present after
	 * the section which contains __smp_alt_end.
	 */
	. = ALIGN(PAGE_SIZE);

	/* Init code and data - will be freed after init */
	. = ALIGN(PAGE_SIZE);
	.init.text : AT(ADDR(.init.text) - LOAD_OFFSET) {
		__init_begin = .;
		_sinittext = .;
		INIT_TEXT
		_einittext = .;
	}

	.init.data : AT(ADDR(.init.data) - LOAD_OFFSET) {
		INIT_DATA
	}

	. = ALIGN(16);
	.init.setup : AT(ADDR(.init.setup) - LOAD_OFFSET) {
		__setup_start = .;
		*(.init.setup)
		__setup_end = .;
	}
	.initcall.init : AT(ADDR(.initcall.init) - LOAD_OFFSET) {
		__initcall_start = .;
		INITCALLS
		__initcall_end = .;
	}

	.con_initcall.init : AT(ADDR(.con_initcall.init) - LOAD_OFFSET) {
		__con_initcall_start = .;
		*(.con_initcall.init)
		__con_initcall_end = .;
	}

	.x86_cpu_dev.init : AT(ADDR(.x86_cpu_dev.init) - LOAD_OFFSET) {
		__x86_cpu_dev_start = .;
		*(.x86_cpu_dev.init)
		__x86_cpu_dev_end = .;
	}

	SECURITY_INIT

	. = ALIGN(4);
	.altinstructions : AT(ADDR(.altinstructions) - LOAD_OFFSET) {
		__alt_instructions = .;
		*(.altinstructions)
		__alt_instructions_end = .;
	}

	.altinstr_replacement : AT(ADDR(.altinstr_replacement) - LOAD_OFFSET) {
		*(.altinstr_replacement)
	}

	. = ALIGN(4);
	.parainstructions : AT(ADDR(.parainstructions) - LOAD_OFFSET) {
		__parainstructions = .;
		*(.parainstructions)
		__parainstructions_end = .;
	}

	/*
	 * .exit.text is discard at runtime, not link time, to deal with
	 *  references from .altinstructions and .eh_frame
	 */
	.exit.text : AT(ADDR(.exit.text) - LOAD_OFFSET) {
		EXIT_TEXT
	}

	.exit.data : AT(ADDR(.exit.data) - LOAD_OFFSET) {
		EXIT_DATA
	}

#if defined(CONFIG_BLK_DEV_INITRD)
	. = ALIGN(PAGE_SIZE);
	.init.ramfs : AT(ADDR(.init.ramfs) - LOAD_OFFSET) {
		__initramfs_start = .;
		*(.init.ramfs)
		__initramfs_end = .;
	}
#endif

	PERCPU(PAGE_SIZE)

	. = ALIGN(PAGE_SIZE);
	/* freed after init ends here */

	/* BSS */
	.bss : AT(ADDR(.bss) - LOAD_OFFSET) {
		__init_end = .;
		__bss_start = .;
		*(.bss.page_aligned)
		*(.bss)
		. = ALIGN(4);
		__bss_stop = .;
	}

	.brk : AT(ADDR(.brk) - LOAD_OFFSET) {
		. = ALIGN(PAGE_SIZE);
		__brk_base = .;
		. += 64 * 1024;		/* 64k alignment slop space */
		*(.brk_reservation)	/* areas brk users have reserved */
		__brk_limit = .;
	}

	.end : AT(ADDR(.end) - LOAD_OFFSET) {
		_end = . ;
	}

	/* Sections to be discarded */
	/DISCARD/ : {
		*(.exitcall.exit)
		*(.discard)
	}

	STABS_DEBUG
	DWARF_DEBUG
}

/*
 * Build-time check on the image size:
 */
ASSERT((_end - LOAD_OFFSET <= KERNEL_IMAGE_SIZE),
	"kernel image bigger than KERNEL_IMAGE_SIZE")

#ifdef CONFIG_KEXEC
/* Link time checks */
#include <asm/kexec.h>

ASSERT(kexec_control_code_size <= KEXEC_CONTROL_CODE_MAX_SIZE,
       "kexec control code size is too big")
#endif