arch/arm/kernel/vmlinux.lds.S - linux - Git at Google

 /* ld script to make ARM Linux kernel
  * taken from the i386 version by Russell King
  * Written by Martin Mares <mj@atrey.karlin.mff.cuni.cz>
  */

 #include <asm-generic/vmlinux.lds.h>
 #include <asm/cache.h>
 #include <asm/thread_info.h>
 #include <asm/memory.h>
 #include <asm/page.h>

 #define PROC_INFO							\
 	. = ALIGN(4);							\
 	VMLINUX_SYMBOL(__proc_info_begin) = .;				\
 	*(.proc.info.init)						\
 	VMLINUX_SYMBOL(__proc_info_end) = .;

 #define IDMAP_TEXT							\
 	ALIGN_FUNCTION();						\
 	VMLINUX_SYMBOL(__idmap_text_start) = .;				\
 	*(.idmap.text)							\
 	VMLINUX_SYMBOL(__idmap_text_end) = .;

 #ifdef CONFIG_HOTPLUG_CPU
 #define ARM_CPU_DISCARD(x)
 #define ARM_CPU_KEEP(x)		x
 #else
 #define ARM_CPU_DISCARD(x)	x
 #define ARM_CPU_KEEP(x)
 #endif

 #if (defined(CONFIG_SMP_ON_UP) && !defined(CONFIG_DEBUG_SPINLOCK)) || \
 	defined(CONFIG_GENERIC_BUG)
 #define ARM_EXIT_KEEP(x)	x
 #define ARM_EXIT_DISCARD(x)
 #else
 #define ARM_EXIT_KEEP(x)
 #define ARM_EXIT_DISCARD(x)	x
 #endif

 OUTPUT_ARCH(arm)
 ENTRY(stext)

 #ifndef __ARMEB__
 jiffies = jiffies_64;
 #else
 jiffies = jiffies_64 + 4;
 #endif

 SECTIONS
 {
 	/*
 	 * XXX: The linker does not define how output sections are
 	 * assigned to input sections when there are multiple statements
 	 * matching the same input section name.  There is no documented
 	 * order of matching.
 	 *
 	 * unwind exit sections must be discarded before the rest of the
 	 * unwind sections get included.
 	 */
 	/DISCARD/ : {
 		*(.ARM.exidx.exit.text)
 		*(.ARM.extab.exit.text)
 		ARM_CPU_DISCARD(*(.ARM.exidx.cpuexit.text))
 		ARM_CPU_DISCARD(*(.ARM.extab.cpuexit.text))
 		ARM_EXIT_DISCARD(EXIT_TEXT)
 		ARM_EXIT_DISCARD(EXIT_DATA)
 		EXIT_CALL
 #ifndef CONFIG_HOTPLUG
 		*(.ARM.exidx.devexit.text)
 		*(.ARM.extab.devexit.text)
 #endif
 #ifndef CONFIG_MMU
 		*(.fixup)
 		*(__ex_table)
 #endif
 #ifndef CONFIG_SMP_ON_UP
 		*(.alt.smp.init)
 #endif
 		*(.discard)
 		*(.discard.*)
 	}

 #ifdef CONFIG_XIP_KERNEL
 	. = XIP_VIRT_ADDR(CONFIG_XIP_PHYS_ADDR);
 #else
 	. = PAGE_OFFSET + TEXT_OFFSET;
 #endif
 	.head.text : {
 		_text = .;
 		HEAD_TEXT
 	}
 	.text : {			/* Real text segment		*/
 		_stext = .;		/* Text and read-only data	*/
 			__exception_text_start = .;
 			*(.exception.text)
 			__exception_text_end = .;
 			IRQENTRY_TEXT
 			TEXT_TEXT
 			SCHED_TEXT
 			LOCK_TEXT
 			KPROBES_TEXT
 			IDMAP_TEXT
 #ifdef CONFIG_MMU
 			*(.fixup)
 #endif
 			*(.gnu.warning)
 			*(.glue_7)
 			*(.glue_7t)
 		. = ALIGN(4);
 		*(.got)			/* Global offset table		*/
 			ARM_CPU_KEEP(PROC_INFO)
 	}

 	RO_DATA(PAGE_SIZE)

 	. = ALIGN(4);
 	__ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) {
 		__start___ex_table = .;
 #ifdef CONFIG_MMU
 		*(__ex_table)
 #endif
 		__stop___ex_table = .;
 	}

 #ifdef CONFIG_ARM_UNWIND
 	/*
 	 * Stack unwinding tables
 	 */
 	. = ALIGN(8);
 	.ARM.unwind_idx : {
 		__start_unwind_idx = .;
 		*(.ARM.exidx*)
 		__stop_unwind_idx = .;
 	}
 	.ARM.unwind_tab : {
 		__start_unwind_tab = .;
 		*(.ARM.extab*)
 		__stop_unwind_tab = .;
 	}
 #endif

 	NOTES

 	_etext = .;			/* End of text and rodata section */

 #ifndef CONFIG_XIP_KERNEL
 	. = ALIGN(PAGE_SIZE);
 	__init_begin = .;
 #endif

 	INIT_TEXT_SECTION(8)
 	.exit.text : {
 		ARM_EXIT_KEEP(EXIT_TEXT)
 	}
 	.init.proc.info : {
 		ARM_CPU_DISCARD(PROC_INFO)
 	}
 	.init.arch.info : {
 		__arch_info_begin = .;
 		*(.arch.info.init)
 		__arch_info_end = .;
 	}
 	.init.tagtable : {
 		__tagtable_begin = .;
 		*(.taglist.init)
 		__tagtable_end = .;
 	}
 #ifdef CONFIG_SMP_ON_UP
 	.init.smpalt : {
 		__smpalt_begin = .;
 		*(.alt.smp.init)
 		__smpalt_end = .;
 	}
 #endif
 	.init.pv_table : {
 		__pv_table_begin = .;
 		*(.pv_table)
 		__pv_table_end = .;
 	}
 	.init.data : {
 #ifndef CONFIG_XIP_KERNEL
 		INIT_DATA
 #endif
 		INIT_SETUP(16)
 		INIT_CALLS
 		CON_INITCALL
 		SECURITY_INITCALL
 		INIT_RAM_FS
 	}
 #ifndef CONFIG_XIP_KERNEL
 	.exit.data : {
 		ARM_EXIT_KEEP(EXIT_DATA)
 	}
 #endif

 #ifdef CONFIG_SMP
 	PERCPU_SECTION(L1_CACHE_BYTES)
 #endif

 #ifdef CONFIG_XIP_KERNEL
 	__data_loc = ALIGN(4);		/* location in binary */
 	. = PAGE_OFFSET + TEXT_OFFSET;
 #else
 	__init_end = .;
 	. = ALIGN(THREAD_SIZE);
 	__data_loc = .;
 #endif

 	.data : AT(__data_loc) {
 		_data = .;		/* address in memory */
 		_sdata = .;

 		/*
 		 * first, the init task union, aligned
 		 * to an 8192 byte boundary.
 		 */
 		INIT_TASK_DATA(THREAD_SIZE)

 #ifdef CONFIG_XIP_KERNEL
 		. = ALIGN(PAGE_SIZE);
 		__init_begin = .;
 		INIT_DATA
 		ARM_EXIT_KEEP(EXIT_DATA)
 		. = ALIGN(PAGE_SIZE);
 		__init_end = .;
 #endif

 		NOSAVE_DATA
 		CACHELINE_ALIGNED_DATA(L1_CACHE_BYTES)
 		READ_MOSTLY_DATA(L1_CACHE_BYTES)

 		/*
 		 * and the usual data section
 		 */
 		DATA_DATA
 		CONSTRUCTORS

 		_edata = .;
 	}
 	_edata_loc = __data_loc + SIZEOF(.data);

 #ifdef CONFIG_HAVE_TCM
         /*
 	 * We align everything to a page boundary so we can
 	 * free it after init has commenced and TCM contents have
 	 * been copied to its destination.
 	 */
 	.tcm_start : {
 		. = ALIGN(PAGE_SIZE);
 		__tcm_start = .;
 		__itcm_start = .;
 	}

 	/*
 	 * Link these to the ITCM RAM
 	 * Put VMA to the TCM address and LMA to the common RAM
 	 * and we'll upload the contents from RAM to TCM and free
 	 * the used RAM after that.
 	 */
 	.text_itcm ITCM_OFFSET : AT(__itcm_start)
 	{
 		__sitcm_text = .;
 		*(.tcm.text)
 		*(.tcm.rodata)
 		. = ALIGN(4);
 		__eitcm_text = .;
 	}

 	/*
 	 * Reset the dot pointer, this is needed to create the
 	 * relative __dtcm_start below (to be used as extern in code).
 	 */
 	. = ADDR(.tcm_start) + SIZEOF(.tcm_start) + SIZEOF(.text_itcm);

 	.dtcm_start : {
 		__dtcm_start = .;
 	}

 	/* TODO: add remainder of ITCM as well, that can be used for data! */
 	.data_dtcm DTCM_OFFSET : AT(__dtcm_start)
 	{
 		. = ALIGN(4);
 		__sdtcm_data = .;
 		*(.tcm.data)
 		. = ALIGN(4);
 		__edtcm_data = .;
 	}

 	/* Reset the dot pointer or the linker gets confused */
 	. = ADDR(.dtcm_start) + SIZEOF(.data_dtcm);

 	/* End marker for freeing TCM copy in linked object */
 	.tcm_end : AT(ADDR(.dtcm_start) + SIZEOF(.data_dtcm)){
 		. = ALIGN(PAGE_SIZE);
 		__tcm_end = .;
 	}
 #endif

 	BSS_SECTION(0, 0, 0)
 	_end = .;

 	STABS_DEBUG
 	.comment 0 : { *(.comment) }
 }

 /*
  * These must never be empty
  * If you have to comment these two assert statements out, your
  * binutils is too old (for other reasons as well)
  */
 ASSERT((__proc_info_end - __proc_info_begin), "missing CPU support")
 ASSERT((__arch_info_end - __arch_info_begin), "no machine record defined")
	/* ld script to make ARM Linux kernel
	* taken from the i386 version by Russell King
	* Written by Martin Mares <mj@atrey.karlin.mff.cuni.cz>
	*/

	#include <asm-generic/vmlinux.lds.h>
	#include <asm/cache.h>
	#include <asm/thread_info.h>
	#include <asm/memory.h>
	#include <asm/page.h>

	#define PROC_INFO \
	. = ALIGN(4); \
	VMLINUX_SYMBOL(__proc_info_begin) = .; \
	*(.proc.info.init) \
	VMLINUX_SYMBOL(__proc_info_end) = .;

	#define IDMAP_TEXT \
	ALIGN_FUNCTION(); \
	VMLINUX_SYMBOL(__idmap_text_start) = .; \
	*(.idmap.text) \
	VMLINUX_SYMBOL(__idmap_text_end) = .;

	#ifdef CONFIG_HOTPLUG_CPU
	#define ARM_CPU_DISCARD(x)
	#define ARM_CPU_KEEP(x) x
	#else
	#define ARM_CPU_DISCARD(x) x
	#define ARM_CPU_KEEP(x)
	#endif

	#if (defined(CONFIG_SMP_ON_UP) && !defined(CONFIG_DEBUG_SPINLOCK)) \|\| \
	defined(CONFIG_GENERIC_BUG)
	#define ARM_EXIT_KEEP(x) x
	#define ARM_EXIT_DISCARD(x)
	#else
	#define ARM_EXIT_KEEP(x)
	#define ARM_EXIT_DISCARD(x) x
	#endif

	OUTPUT_ARCH(arm)
	ENTRY(stext)

	#ifndef __ARMEB__
	jiffies = jiffies_64;
	#else
	jiffies = jiffies_64 + 4;
	#endif

	SECTIONS
	{
	/*
	* XXX: The linker does not define how output sections are
	* assigned to input sections when there are multiple statements
	* matching the same input section name. There is no documented
	* order of matching.
	*
	* unwind exit sections must be discarded before the rest of the
	* unwind sections get included.
	*/
	/DISCARD/ : {
	*(.ARM.exidx.exit.text)
	*(.ARM.extab.exit.text)
	ARM_CPU_DISCARD(*(.ARM.exidx.cpuexit.text))
	ARM_CPU_DISCARD(*(.ARM.extab.cpuexit.text))
	ARM_EXIT_DISCARD(EXIT_TEXT)
	ARM_EXIT_DISCARD(EXIT_DATA)
	EXIT_CALL
	#ifndef CONFIG_HOTPLUG
	*(.ARM.exidx.devexit.text)
	*(.ARM.extab.devexit.text)
	#endif
	#ifndef CONFIG_MMU
	*(.fixup)
	*(__ex_table)
	#endif
	#ifndef CONFIG_SMP_ON_UP
	*(.alt.smp.init)
	#endif
	*(.discard)
	(.discard.)
	}

	#ifdef CONFIG_XIP_KERNEL
	. = XIP_VIRT_ADDR(CONFIG_XIP_PHYS_ADDR);
	#else
	. = PAGE_OFFSET + TEXT_OFFSET;
	#endif
	.head.text : {
	_text = .;
	HEAD_TEXT
	}
	.text : { /* Real text segment */
	_stext = .; /* Text and read-only data */
	__exception_text_start = .;
	*(.exception.text)
	__exception_text_end = .;
	IRQENTRY_TEXT
	TEXT_TEXT
	SCHED_TEXT
	LOCK_TEXT
	KPROBES_TEXT
	IDMAP_TEXT
	#ifdef CONFIG_MMU
	*(.fixup)
	#endif
	*(.gnu.warning)
	*(.glue_7)
	*(.glue_7t)
	. = ALIGN(4);
	(.got) / Global offset table */
	ARM_CPU_KEEP(PROC_INFO)
	}

	RO_DATA(PAGE_SIZE)

	. = ALIGN(4);
	__ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) {
	__start___ex_table = .;
	#ifdef CONFIG_MMU
	*(__ex_table)
	#endif
	__stop___ex_table = .;
	}

	#ifdef CONFIG_ARM_UNWIND
	/*
	* Stack unwinding tables
	*/
	. = ALIGN(8);
	.ARM.unwind_idx : {
	__start_unwind_idx = .;
	(.ARM.exidx)
	__stop_unwind_idx = .;
	}
	.ARM.unwind_tab : {
	__start_unwind_tab = .;
	(.ARM.extab)
	__stop_unwind_tab = .;
	}
	#endif

	NOTES

	_etext = .; /* End of text and rodata section */

	#ifndef CONFIG_XIP_KERNEL
	. = ALIGN(PAGE_SIZE);
	__init_begin = .;
	#endif

	INIT_TEXT_SECTION(8)
	.exit.text : {
	ARM_EXIT_KEEP(EXIT_TEXT)
	}
	.init.proc.info : {
	ARM_CPU_DISCARD(PROC_INFO)
	}
	.init.arch.info : {
	__arch_info_begin = .;
	*(.arch.info.init)
	__arch_info_end = .;
	}
	.init.tagtable : {
	__tagtable_begin = .;
	*(.taglist.init)
	__tagtable_end = .;
	}
	#ifdef CONFIG_SMP_ON_UP
	.init.smpalt : {
	__smpalt_begin = .;
	*(.alt.smp.init)
	__smpalt_end = .;
	}
	#endif
	.init.pv_table : {
	__pv_table_begin = .;
	*(.pv_table)
	__pv_table_end = .;
	}
	.init.data : {
	#ifndef CONFIG_XIP_KERNEL
	INIT_DATA
	#endif
	INIT_SETUP(16)
	INIT_CALLS
	CON_INITCALL
	SECURITY_INITCALL
	INIT_RAM_FS
	}
	#ifndef CONFIG_XIP_KERNEL
	.exit.data : {
	ARM_EXIT_KEEP(EXIT_DATA)
	}
	#endif

	#ifdef CONFIG_SMP
	PERCPU_SECTION(L1_CACHE_BYTES)
	#endif

	#ifdef CONFIG_XIP_KERNEL
	__data_loc = ALIGN(4); /* location in binary */
	. = PAGE_OFFSET + TEXT_OFFSET;
	#else
	__init_end = .;
	. = ALIGN(THREAD_SIZE);
	__data_loc = .;
	#endif

	.data : AT(__data_loc) {
	_data = .; /* address in memory */
	_sdata = .;

	/*
	* first, the init task union, aligned
	* to an 8192 byte boundary.
	*/
	INIT_TASK_DATA(THREAD_SIZE)

	#ifdef CONFIG_XIP_KERNEL
	. = ALIGN(PAGE_SIZE);
	__init_begin = .;
	INIT_DATA
	ARM_EXIT_KEEP(EXIT_DATA)
	. = ALIGN(PAGE_SIZE);
	__init_end = .;
	#endif

	NOSAVE_DATA
	CACHELINE_ALIGNED_DATA(L1_CACHE_BYTES)
	READ_MOSTLY_DATA(L1_CACHE_BYTES)

	/*
	* and the usual data section
	*/
	DATA_DATA
	CONSTRUCTORS

	_edata = .;
	}
	_edata_loc = __data_loc + SIZEOF(.data);

	#ifdef CONFIG_HAVE_TCM
	/*
	* We align everything to a page boundary so we can
	* free it after init has commenced and TCM contents have
	* been copied to its destination.
	*/
	.tcm_start : {
	. = ALIGN(PAGE_SIZE);
	__tcm_start = .;
	__itcm_start = .;
	}

	/*
	* Link these to the ITCM RAM
	* Put VMA to the TCM address and LMA to the common RAM
	* and we'll upload the contents from RAM to TCM and free
	* the used RAM after that.
	*/
	.text_itcm ITCM_OFFSET : AT(__itcm_start)
	{
	__sitcm_text = .;
	*(.tcm.text)
	*(.tcm.rodata)
	. = ALIGN(4);
	__eitcm_text = .;
	}

	/*
	* Reset the dot pointer, this is needed to create the
	* relative __dtcm_start below (to be used as extern in code).
	*/
	. = ADDR(.tcm_start) + SIZEOF(.tcm_start) + SIZEOF(.text_itcm);

	.dtcm_start : {
	__dtcm_start = .;
	}

	/* TODO: add remainder of ITCM as well, that can be used for data! */
	.data_dtcm DTCM_OFFSET : AT(__dtcm_start)
	{
	. = ALIGN(4);
	__sdtcm_data = .;
	*(.tcm.data)
	. = ALIGN(4);
	__edtcm_data = .;
	}

	/* Reset the dot pointer or the linker gets confused */
	. = ADDR(.dtcm_start) + SIZEOF(.data_dtcm);

	/* End marker for freeing TCM copy in linked object */
	.tcm_end : AT(ADDR(.dtcm_start) + SIZEOF(.data_dtcm)){
	. = ALIGN(PAGE_SIZE);
	__tcm_end = .;
	}
	#endif

	BSS_SECTION(0, 0, 0)
	_end = .;

	STABS_DEBUG
	.comment 0 : { *(.comment) }
	}

	/*
	* These must never be empty
	* If you have to comment these two assert statements out, your
	* binutils is too old (for other reasons as well)
	*/
	ASSERT((__proc_info_end - __proc_info_begin), "missing CPU support")
	ASSERT((__arch_info_end - __arch_info_begin), "no machine record defined")