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

 #ifdef CONFIG_PPC64
 #define PROVIDE32(x)	PROVIDE(__unused__##x)
 #else
 #define PROVIDE32(x)	PROVIDE(x)
 #endif
 #include <asm/page.h>
 #include <asm-generic/vmlinux.lds.h>
 #include <asm/cache.h>
 #include <asm/thread_info.h>

 ENTRY(_stext)

 PHDRS {
 	kernel PT_LOAD FLAGS(7); /* RWX */
 	notes PT_NOTE FLAGS(0);
 	dummy PT_NOTE FLAGS(0);

 	/* binutils < 2.18 has a bug that makes it misbehave when taking an
 	   ELF file with all segments at load address 0 as input.  This
 	   happens when running "strip" on vmlinux, because of the AT() magic
 	   in this linker script.  People using GCC >= 4.2 won't run into
 	   this problem, because the "build-id" support will put some data
 	   into the "notes" segment (at a non-zero load address).

 	   To work around this, we force some data into both the "dummy"
 	   segment and the kernel segment, so the dummy segment will get a
 	   non-zero load address.  It's not enough to always create the
 	   "notes" segment, since if nothing gets assigned to it, its load
 	   address will be zero.  */
 }

 #ifdef CONFIG_PPC64
 OUTPUT_ARCH(powerpc:common64)
 jiffies = jiffies_64;
 #else
 OUTPUT_ARCH(powerpc:common)
 jiffies = jiffies_64 + 4;
 #endif
 SECTIONS
 {
 	. = KERNELBASE;

 /*
  * Text, read only data and other permanent read-only sections
  */

 	_text = .;
 	_stext = .;

 	/*
 	 * Head text.
 	 * This needs to be in its own output section to avoid ld placing
 	 * branch trampoline stubs randomly throughout the fixed sections,
 	 * which it will do (even if the branch comes from another section)
 	 * in order to optimize stub generation.
 	 */
 	.head.text : AT(ADDR(.head.text) - LOAD_OFFSET) {
 #ifdef CONFIG_PPC64
 		KEEP(*(.head.text.first_256B));
 #ifdef CONFIG_PPC_BOOK3E
 # define END_FIXED	0x100
 #else
 		KEEP(*(.head.text.real_vectors));
 		*(.head.text.real_trampolines);
 		KEEP(*(.head.text.virt_vectors));
 		*(.head.text.virt_trampolines);
 # if defined(CONFIG_PPC_PSERIES) || defined(CONFIG_PPC_POWERNV)
 		KEEP(*(.head.data.fwnmi_page));
 #  define END_FIXED	0x8000
 # else
 #  define END_FIXED	0x7000
 # endif
 #endif
 		ASSERT((. == END_FIXED), "vmlinux.lds.S: fixed section overflow error");
 #else /* !CONFIG_PPC64 */
 		HEAD_TEXT
 #endif
 	} :kernel

 	/*
 	 * If the build dies here, it's likely code in head_64.S is referencing
 	 * labels it can't reach, and the linker inserting stubs without the
 	 * assembler's knowledge. To debug, remove the above assert and
 	 * rebuild. Look for branch stubs in the fixed section region.
 	 *
 	 * Linker stub generation could be allowed in "trampoline"
 	 * sections if absolutely necessary, but this would require
 	 * some rework of the fixed sections. Before resorting to this,
 	 * consider references that have sufficient addressing range,
 	 * (e.g., hand coded trampolines) so the linker does not have
 	 * to add stubs.
 	 *
 	 * Linker stubs at the top of the main text section are currently not
 	 * detected, and will result in a crash at boot due to offsets being
 	 * wrong.
 	 */
 #ifdef CONFIG_PPC64
 	/*
 	 * BLOCK(0) overrides the default output section alignment because
 	 * this needs to start right after .head.text in order for fixed
 	 * section placement to work.
 	 */
 	.text BLOCK(0) : AT(ADDR(.text) - LOAD_OFFSET) {
 #else
 	.text : AT(ADDR(.text) - LOAD_OFFSET) {
 		ALIGN_FUNCTION();
 #endif
 		/* careful! __ftr_alt_* sections need to be close to .text */
 		*(.text .fixup __ftr_alt_* .ref.text)
 		SCHED_TEXT
 		CPUIDLE_TEXT
 		LOCK_TEXT
 		KPROBES_TEXT
 		IRQENTRY_TEXT
 		SOFTIRQENTRY_TEXT
 		MEM_KEEP(init.text)
 		MEM_KEEP(exit.text)

 #ifdef CONFIG_PPC32
 		*(.got1)
 		__got2_start = .;
 		*(.got2)
 		__got2_end = .;
 #endif /* CONFIG_PPC32 */

 	} :kernel

 	. = ALIGN(PAGE_SIZE);
 	_etext = .;
 	PROVIDE32 (etext = .);

 	/* Read-only data */
 	RODATA

 	EXCEPTION_TABLE(0)

 	NOTES :kernel :notes

 	/* The dummy segment contents for the bug workaround mentioned above
 	   near PHDRS.  */
 	.dummy : AT(ADDR(.dummy) - LOAD_OFFSET) {
 		LONG(0)
 		LONG(0)
 		LONG(0)
 	} :kernel :dummy

 /*
  * Init sections discarded at runtime
  */
 	. = ALIGN(PAGE_SIZE);
 	__init_begin = .;
 	INIT_TEXT_SECTION(PAGE_SIZE) :kernel

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

 	.init.data : AT(ADDR(.init.data) - LOAD_OFFSET) {
 		INIT_DATA
 		__vtop_table_begin = .;
 		*(.vtop_fixup);
 		__vtop_table_end = .;
 		__ptov_table_begin = .;
 		*(.ptov_fixup);
 		__ptov_table_end = .;
 	}

 	.init.setup : AT(ADDR(.init.setup) - LOAD_OFFSET) {
 		INIT_SETUP(16)
 	}

 	.initcall.init : AT(ADDR(.initcall.init) - LOAD_OFFSET) {
 		INIT_CALLS
 	}

 	.con_initcall.init : AT(ADDR(.con_initcall.init) - LOAD_OFFSET) {
 		CON_INITCALL
 	}

 	SECURITY_INIT

 	. = ALIGN(8);
 	__ftr_fixup : AT(ADDR(__ftr_fixup) - LOAD_OFFSET) {
 		__start___ftr_fixup = .;
 		*(__ftr_fixup)
 		__stop___ftr_fixup = .;
 	}
 	. = ALIGN(8);
 	__mmu_ftr_fixup : AT(ADDR(__mmu_ftr_fixup) - LOAD_OFFSET) {
 		__start___mmu_ftr_fixup = .;
 		*(__mmu_ftr_fixup)
 		__stop___mmu_ftr_fixup = .;
 	}
 	. = ALIGN(8);
 	__lwsync_fixup : AT(ADDR(__lwsync_fixup) - LOAD_OFFSET) {
 		__start___lwsync_fixup = .;
 		*(__lwsync_fixup)
 		__stop___lwsync_fixup = .;
 	}
 #ifdef CONFIG_PPC64
 	. = ALIGN(8);
 	__fw_ftr_fixup : AT(ADDR(__fw_ftr_fixup) - LOAD_OFFSET) {
 		__start___fw_ftr_fixup = .;
 		*(__fw_ftr_fixup)
 		__stop___fw_ftr_fixup = .;
 	}
 #endif
 	.init.ramfs : AT(ADDR(.init.ramfs) - LOAD_OFFSET) {
 		INIT_RAM_FS
 	}

 	PERCPU_SECTION(L1_CACHE_BYTES)

 	. = ALIGN(8);
 	.machine.desc : AT(ADDR(.machine.desc) - LOAD_OFFSET) {
 		__machine_desc_start = . ;
 		*(.machine.desc)
 		__machine_desc_end = . ;
 	}
 #ifdef CONFIG_RELOCATABLE
 	. = ALIGN(8);
 	.dynsym : AT(ADDR(.dynsym) - LOAD_OFFSET)
 	{
 #ifdef CONFIG_PPC32
 		__dynamic_symtab = .;
 #endif
 		*(.dynsym)
 	}
 	.dynstr : AT(ADDR(.dynstr) - LOAD_OFFSET) { *(.dynstr) }
 	.dynamic : AT(ADDR(.dynamic) - LOAD_OFFSET)
 	{
 		__dynamic_start = .;
 		*(.dynamic)
 	}
 	.hash : AT(ADDR(.hash) - LOAD_OFFSET) { *(.hash) }
 	.interp : AT(ADDR(.interp) - LOAD_OFFSET) { *(.interp) }
 	.rela.dyn : AT(ADDR(.rela.dyn) - LOAD_OFFSET)
 	{
 		__rela_dyn_start = .;
 		*(.rela*)
 	}
 #endif
 	/* .exit.data is discarded at runtime, not link time,
 	 * to deal with references from .exit.text
 	 */
 	.exit.data : AT(ADDR(.exit.data) - LOAD_OFFSET) {
 		EXIT_DATA
 	}

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

 /*
  * And now the various read/write data
  */

 	. = ALIGN(PAGE_SIZE);
 	_sdata = .;

 #ifdef CONFIG_PPC32
 	.data : AT(ADDR(.data) - LOAD_OFFSET) {
 		DATA_DATA
 		*(.sdata)
 		*(.got.plt) *(.got)
 	}
 #else
 	.data : AT(ADDR(.data) - LOAD_OFFSET) {
 		DATA_DATA
 		*(.data.rel*)
 		*(.toc1)
 		*(.branch_lt)
 	}

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

 	. = ALIGN(256);
 	.got : AT(ADDR(.got) - LOAD_OFFSET) {
 		__toc_start = .;
 #ifndef CONFIG_RELOCATABLE
 		__prom_init_toc_start = .;
 		arch/powerpc/kernel/prom_init.o*(.toc .got)
 		__prom_init_toc_end = .;
 #endif
 		*(.got)
 		*(.toc)
 	}
 #endif

 	/* The initial task and kernel stack */
 	INIT_TASK_DATA_SECTION(THREAD_SIZE)

 	.data..page_aligned : AT(ADDR(.data..page_aligned) - LOAD_OFFSET) {
 		PAGE_ALIGNED_DATA(PAGE_SIZE)
 	}

 	.data..cacheline_aligned : AT(ADDR(.data..cacheline_aligned) - LOAD_OFFSET) {
 		CACHELINE_ALIGNED_DATA(L1_CACHE_BYTES)
 	}

 	.data..read_mostly : AT(ADDR(.data..read_mostly) - LOAD_OFFSET) {
 		READ_MOSTLY_DATA(L1_CACHE_BYTES)
 	}

 	. = ALIGN(PAGE_SIZE);
 	.data_nosave : AT(ADDR(.data_nosave) - LOAD_OFFSET) {
 		NOSAVE_DATA
 	}

 	. = ALIGN(PAGE_SIZE);
 	_edata  =  .;
 	PROVIDE32 (edata = .);

 /*
  * And finally the bss
  */

 	BSS_SECTION(0, 0, 0)

 	. = ALIGN(PAGE_SIZE);
 	_end = . ;
 	PROVIDE32 (end = .);

 	/* Sections to be discarded. */
 	DISCARDS
 }
	#ifdef CONFIG_PPC64
	#define PROVIDE32(x) PROVIDE(__unused__##x)
	#else
	#define PROVIDE32(x) PROVIDE(x)
	#endif
	#include <asm/page.h>
	#include <asm-generic/vmlinux.lds.h>
	#include <asm/cache.h>
	#include <asm/thread_info.h>

	ENTRY(_stext)

	PHDRS {
	kernel PT_LOAD FLAGS(7); /* RWX */
	notes PT_NOTE FLAGS(0);
	dummy PT_NOTE FLAGS(0);

	/* binutils < 2.18 has a bug that makes it misbehave when taking an
	ELF file with all segments at load address 0 as input. This
	happens when running "strip" on vmlinux, because of the AT() magic
	in this linker script. People using GCC >= 4.2 won't run into
	this problem, because the "build-id" support will put some data
	into the "notes" segment (at a non-zero load address).

	To work around this, we force some data into both the "dummy"
	segment and the kernel segment, so the dummy segment will get a
	non-zero load address. It's not enough to always create the
	"notes" segment, since if nothing gets assigned to it, its load
	address will be zero. */
	}

	#ifdef CONFIG_PPC64
	OUTPUT_ARCH(powerpc:common64)
	jiffies = jiffies_64;
	#else
	OUTPUT_ARCH(powerpc:common)
	jiffies = jiffies_64 + 4;
	#endif
	SECTIONS
	{
	. = KERNELBASE;

	/*
	* Text, read only data and other permanent read-only sections
	*/

	_text = .;
	_stext = .;

	/*
	* Head text.
	* This needs to be in its own output section to avoid ld placing
	* branch trampoline stubs randomly throughout the fixed sections,
	* which it will do (even if the branch comes from another section)
	* in order to optimize stub generation.
	*/
	.head.text : AT(ADDR(.head.text) - LOAD_OFFSET) {
	#ifdef CONFIG_PPC64
	KEEP(*(.head.text.first_256B));
	#ifdef CONFIG_PPC_BOOK3E
	# define END_FIXED 0x100
	#else
	KEEP(*(.head.text.real_vectors));
	*(.head.text.real_trampolines);
	KEEP(*(.head.text.virt_vectors));
	*(.head.text.virt_trampolines);
	# if defined(CONFIG_PPC_PSERIES) \|\| defined(CONFIG_PPC_POWERNV)
	KEEP(*(.head.data.fwnmi_page));
	# define END_FIXED 0x8000
	# else
	# define END_FIXED 0x7000
	# endif
	#endif
	ASSERT((. == END_FIXED), "vmlinux.lds.S: fixed section overflow error");
	#else /* !CONFIG_PPC64 */
	HEAD_TEXT
	#endif
	} :kernel

	/*
	* If the build dies here, it's likely code in head_64.S is referencing
	* labels it can't reach, and the linker inserting stubs without the
	* assembler's knowledge. To debug, remove the above assert and
	* rebuild. Look for branch stubs in the fixed section region.
	*
	* Linker stub generation could be allowed in "trampoline"
	* sections if absolutely necessary, but this would require
	* some rework of the fixed sections. Before resorting to this,
	* consider references that have sufficient addressing range,
	* (e.g., hand coded trampolines) so the linker does not have
	* to add stubs.
	*
	* Linker stubs at the top of the main text section are currently not
	* detected, and will result in a crash at boot due to offsets being
	* wrong.
	*/
	#ifdef CONFIG_PPC64
	/*
	* BLOCK(0) overrides the default output section alignment because
	* this needs to start right after .head.text in order for fixed
	* section placement to work.
	*/
	.text BLOCK(0) : AT(ADDR(.text) - LOAD_OFFSET) {
	#else
	.text : AT(ADDR(.text) - LOAD_OFFSET) {
	ALIGN_FUNCTION();
	#endif
	/* careful! __ftr_alt_* sections need to be close to .text */
	(.text .fixup __ftr_alt_ .ref.text)
	SCHED_TEXT
	CPUIDLE_TEXT
	LOCK_TEXT
	KPROBES_TEXT
	IRQENTRY_TEXT
	SOFTIRQENTRY_TEXT
	MEM_KEEP(init.text)
	MEM_KEEP(exit.text)

	#ifdef CONFIG_PPC32
	*(.got1)
	__got2_start = .;
	*(.got2)
	__got2_end = .;
	#endif /* CONFIG_PPC32 */

	} :kernel

	. = ALIGN(PAGE_SIZE);
	_etext = .;
	PROVIDE32 (etext = .);

	/* Read-only data */
	RODATA

	EXCEPTION_TABLE(0)

	NOTES :kernel :notes

	/* The dummy segment contents for the bug workaround mentioned above
	near PHDRS. */
	.dummy : AT(ADDR(.dummy) - LOAD_OFFSET) {
	LONG(0)
	LONG(0)
	LONG(0)
	} :kernel :dummy

	/*
	* Init sections discarded at runtime
	*/
	. = ALIGN(PAGE_SIZE);
	__init_begin = .;
	INIT_TEXT_SECTION(PAGE_SIZE) :kernel

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

	.init.data : AT(ADDR(.init.data) - LOAD_OFFSET) {
	INIT_DATA
	__vtop_table_begin = .;
	*(.vtop_fixup);
	__vtop_table_end = .;
	__ptov_table_begin = .;
	*(.ptov_fixup);
	__ptov_table_end = .;
	}

	.init.setup : AT(ADDR(.init.setup) - LOAD_OFFSET) {
	INIT_SETUP(16)
	}

	.initcall.init : AT(ADDR(.initcall.init) - LOAD_OFFSET) {
	INIT_CALLS
	}

	.con_initcall.init : AT(ADDR(.con_initcall.init) - LOAD_OFFSET) {
	CON_INITCALL
	}

	SECURITY_INIT

	. = ALIGN(8);
	__ftr_fixup : AT(ADDR(__ftr_fixup) - LOAD_OFFSET) {
	__start___ftr_fixup = .;
	*(__ftr_fixup)
	__stop___ftr_fixup = .;
	}
	. = ALIGN(8);
	__mmu_ftr_fixup : AT(ADDR(__mmu_ftr_fixup) - LOAD_OFFSET) {
	__start___mmu_ftr_fixup = .;
	*(__mmu_ftr_fixup)
	__stop___mmu_ftr_fixup = .;
	}
	. = ALIGN(8);
	__lwsync_fixup : AT(ADDR(__lwsync_fixup) - LOAD_OFFSET) {
	__start___lwsync_fixup = .;
	*(__lwsync_fixup)
	__stop___lwsync_fixup = .;
	}
	#ifdef CONFIG_PPC64
	. = ALIGN(8);
	__fw_ftr_fixup : AT(ADDR(__fw_ftr_fixup) - LOAD_OFFSET) {
	__start___fw_ftr_fixup = .;
	*(__fw_ftr_fixup)
	__stop___fw_ftr_fixup = .;
	}
	#endif
	.init.ramfs : AT(ADDR(.init.ramfs) - LOAD_OFFSET) {
	INIT_RAM_FS
	}

	PERCPU_SECTION(L1_CACHE_BYTES)

	. = ALIGN(8);
	.machine.desc : AT(ADDR(.machine.desc) - LOAD_OFFSET) {
	__machine_desc_start = . ;
	*(.machine.desc)
	__machine_desc_end = . ;
	}
	#ifdef CONFIG_RELOCATABLE
	. = ALIGN(8);
	.dynsym : AT(ADDR(.dynsym) - LOAD_OFFSET)
	{
	#ifdef CONFIG_PPC32
	__dynamic_symtab = .;
	#endif
	*(.dynsym)
	}
	.dynstr : AT(ADDR(.dynstr) - LOAD_OFFSET) { *(.dynstr) }
	.dynamic : AT(ADDR(.dynamic) - LOAD_OFFSET)
	{
	__dynamic_start = .;
	*(.dynamic)
	}
	.hash : AT(ADDR(.hash) - LOAD_OFFSET) { *(.hash) }
	.interp : AT(ADDR(.interp) - LOAD_OFFSET) { *(.interp) }
	.rela.dyn : AT(ADDR(.rela.dyn) - LOAD_OFFSET)
	{
	__rela_dyn_start = .;
	(.rela)
	}
	#endif
	/* .exit.data is discarded at runtime, not link time,
	* to deal with references from .exit.text
	*/
	.exit.data : AT(ADDR(.exit.data) - LOAD_OFFSET) {
	EXIT_DATA
	}

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

	/*
	* And now the various read/write data
	*/

	. = ALIGN(PAGE_SIZE);
	_sdata = .;

	#ifdef CONFIG_PPC32
	.data : AT(ADDR(.data) - LOAD_OFFSET) {
	DATA_DATA
	*(.sdata)
	(.got.plt) (.got)
	}
	#else
	.data : AT(ADDR(.data) - LOAD_OFFSET) {
	DATA_DATA
	(.data.rel)
	*(.toc1)
	*(.branch_lt)
	}

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

	. = ALIGN(256);
	.got : AT(ADDR(.got) - LOAD_OFFSET) {
	__toc_start = .;
	#ifndef CONFIG_RELOCATABLE
	__prom_init_toc_start = .;
	arch/powerpc/kernel/prom_init.o*(.toc .got)
	__prom_init_toc_end = .;
	#endif
	*(.got)
	*(.toc)
	}
	#endif

	/* The initial task and kernel stack */
	INIT_TASK_DATA_SECTION(THREAD_SIZE)

	.data..page_aligned : AT(ADDR(.data..page_aligned) - LOAD_OFFSET) {
	PAGE_ALIGNED_DATA(PAGE_SIZE)
	}

	.data..cacheline_aligned : AT(ADDR(.data..cacheline_aligned) - LOAD_OFFSET) {
	CACHELINE_ALIGNED_DATA(L1_CACHE_BYTES)
	}

	.data..read_mostly : AT(ADDR(.data..read_mostly) - LOAD_OFFSET) {
	READ_MOSTLY_DATA(L1_CACHE_BYTES)
	}

	. = ALIGN(PAGE_SIZE);
	.data_nosave : AT(ADDR(.data_nosave) - LOAD_OFFSET) {
	NOSAVE_DATA
	}

	. = ALIGN(PAGE_SIZE);
	_edata = .;
	PROVIDE32 (edata = .);

	/*
	* And finally the bss
	*/

	BSS_SECTION(0, 0, 0)

	. = ALIGN(PAGE_SIZE);
	_end = . ;
	PROVIDE32 (end = .);

	/* Sections to be discarded. */
	DISCARDS
	}