/* * ld script for the x86 kernel * * Historic 32-bit version written by Martin Mares <mj@atrey.karlin.mff.cuni.cz> * * Modernisation, unification and other changes and fixes: *   Copyright (C) 2007-2009  Sam Ravnborg <sam@ravnborg.org> * * * 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. */ #ifdef CONFIG_X86_32#define LOAD_OFFSET __PAGE_OFFSET#else#define LOAD_OFFSET __START_KERNEL_map#endif #include <asm-generic/vmlinux.lds.h>#include <asm/asm-offsets.h>#include <asm/thread_info.h>#include <asm/page_types.h>#include <asm/cache.h>#include <asm/boot.h> #undef i386     /* in case the preprocessor is a 32bit one */ OUTPUT_FORMAT(CONFIG_OUTPUT_FORMAT, CONFIG_OUTPUT_FORMAT, CONFIG_OUTPUT_FORMAT) #ifdef CONFIG_X86_32OUTPUT_ARCH(i386)ENTRY(phys_startup_32)jiffies = jiffies_64;#elseOUTPUT_ARCH(i386:x86-64)ENTRY(phys_startup_64)jiffies_64 = jiffies;#endif #if defined(CONFIG_X86_64)/* * On 64-bit, align RODATA to 2MB so we retain large page mappings for * boundaries spanning kernel text, rodata and data sections. * * However, kernel identity mappings will have different RWX permissions * to the pages mapping to text and to the pages padding (which are freed) the * text section. Hence kernel identity mappings will be broken to smaller * pages. For 64-bit, kernel text and kernel identity mappings are different, * so we can enable protection checks as well as retain 2MB large page * mappings for kernel text. */#define X64_ALIGN_RODATA_BEGIN	. = ALIGN(HPAGE_SIZE); #define X64_ALIGN_RODATA_END					\		. = ALIGN(HPAGE_SIZE);				\		__end_rodata_hpage_align = .; #else #define X64_ALIGN_RODATA_BEGIN#define X64_ALIGN_RODATA_END #endif PHDRS {	text PT_LOAD FLAGS(5);          /* R_E */	data PT_LOAD FLAGS(6);          /* RW_ */#ifdef CONFIG_X86_64#ifdef CONFIG_SMP	percpu PT_LOAD FLAGS(6);        /* RW_ */#endif	init PT_LOAD FLAGS(7);          /* RWE */#endif	note PT_NOTE FLAGS(0);          /* ___ */} SECTIONS{#ifdef CONFIG_X86_32	. = LOAD_OFFSET + LOAD_PHYSICAL_ADDR;	phys_startup_32 = ABSOLUTE(startup_32 - LOAD_OFFSET);#else	. = __START_KERNEL;	phys_startup_64 = ABSOLUTE(startup_64 - LOAD_OFFSET);#endif 	/* Text and read-only data */	.text :  AT(ADDR(.text) - LOAD_OFFSET) {		_text = .;		_stext = .;		/* bootstrapping code */		HEAD_TEXT		. = ALIGN(8);		TEXT_TEXT		SCHED_TEXT		CPUIDLE_TEXT		LOCK_TEXT		KPROBES_TEXT		ENTRY_TEXT		IRQENTRY_TEXT		SOFTIRQENTRY_TEXT		*(.fixup)		*(.gnu.warning)		/* End of text section */		_etext = .;	} :text = 0x9090 	NOTES :text :note 	EXCEPTION_TABLE(16) :text = 0x9090 	/* .text should occupy whole number of pages */	. = ALIGN(PAGE_SIZE);	X64_ALIGN_RODATA_BEGIN	RO_DATA(PAGE_SIZE)	X64_ALIGN_RODATA_END 	/* Data */	.data : AT(ADDR(.data) - LOAD_OFFSET) {		/* Start of data section */		_sdata = .; 		/* init_task */		INIT_TASK_DATA(THREAD_SIZE) #ifdef CONFIG_X86_32		/* 32 bit has nosave before _edata */		NOSAVE_DATA#endif 		PAGE_ALIGNED_DATA(PAGE_SIZE) 		CACHELINE_ALIGNED_DATA(L1_CACHE_BYTES) 		DATA_DATA		CONSTRUCTORS 		/* rarely changed data like cpu maps */		READ_MOSTLY_DATA(INTERNODE_CACHE_BYTES) 		/* End of data section */		_edata = .;	} :data 	BUG_TABLE 	. = ALIGN(PAGE_SIZE);	__vvar_page = .; 	.vvar : AT(ADDR(.vvar) - LOAD_OFFSET) {		/* work around gold bug 13023 */		__vvar_beginning_hack = .; 		/* Place all vvars at the offsets in asm/vvar.h. */#define EMIT_VVAR(name, offset) 			\		. = __vvar_beginning_hack + offset;	\		*(.vvar_ ## name)#define __VVAR_KERNEL_LDS#include <asm/vvar.h>#undef __VVAR_KERNEL_LDS#undef EMIT_VVAR 		/*		 * Pad the rest of the page with zeros.  Otherwise the loader		 * can leave garbage here.		 */		. = __vvar_beginning_hack + PAGE_SIZE;	} :data        . = ALIGN(__vvar_page + PAGE_SIZE, PAGE_SIZE); 	/* Init code and data - will be freed after init */	. = ALIGN(PAGE_SIZE);	.init.begin : AT(ADDR(.init.begin) - LOAD_OFFSET) {		__init_begin = .; /* paired with __init_end */	} #if defined(CONFIG_X86_64) && defined(CONFIG_SMP)	/*	 * percpu offsets are zero-based on SMP.  PERCPU_VADDR() changes the	 * output PHDR, so the next output section - .init.text - should	 * start another segment - init.	 */	PERCPU_VADDR(INTERNODE_CACHE_BYTES, 0, :percpu)	ASSERT(SIZEOF(.data..percpu) < CONFIG_PHYSICAL_START,	       "per-CPU data too large - increase CONFIG_PHYSICAL_START")#endif 	INIT_TEXT_SECTION(PAGE_SIZE)#ifdef CONFIG_X86_64	:init#endif 	/*	 * Section for code used exclusively before alternatives are run. All	 * references to such code must be patched out by alternatives, normally	 * by using X86_FEATURE_ALWAYS CPU feature bit.	 *	 * See static_cpu_has() for an example.	 */	.altinstr_aux : AT(ADDR(.altinstr_aux) - LOAD_OFFSET) {		*(.altinstr_aux)	} 	INIT_DATA_SECTION(16) 	.x86_cpu_dev.init : AT(ADDR(.x86_cpu_dev.init) - LOAD_OFFSET) {		__x86_cpu_dev_start = .;		*(.x86_cpu_dev.init)		__x86_cpu_dev_end = .;	} #ifdef CONFIG_X86_INTEL_MID	.x86_intel_mid_dev.init : AT(ADDR(.x86_intel_mid_dev.init) - \								LOAD_OFFSET) {		__x86_intel_mid_dev_start = .;		*(.x86_intel_mid_dev.init)		__x86_intel_mid_dev_end = .;	}#endif 	/*	 * start address and size of operations which during runtime	 * can be patched with virtualization friendly instructions or	 * baremetal native ones. Think page table operations.	 * Details in paravirt_types.h	 */	. = ALIGN(8);	.parainstructions : AT(ADDR(.parainstructions) - LOAD_OFFSET) {		__parainstructions = .;		*(.parainstructions)		__parainstructions_end = .;	} 	/*	 * struct alt_inst entries. From the header (alternative.h):	 * "Alternative instructions for different CPU types or capabilities"	 * Think locking instructions on spinlocks.	 */	. = ALIGN(8);	.altinstructions : AT(ADDR(.altinstructions) - LOAD_OFFSET) {		__alt_instructions = .;		*(.altinstructions)		__alt_instructions_end = .;	} 	/*	 * And here are the replacement instructions. The linker sticks	 * them as binary blobs. The .altinstructions has enough data to	 * get the address and the length of them to patch the kernel safely.	 */	.altinstr_replacement : AT(ADDR(.altinstr_replacement) - LOAD_OFFSET) {		*(.altinstr_replacement)	} 	/*	 * struct iommu_table_entry entries are injected in this section.	 * It is an array of IOMMUs which during run time gets sorted depending	 * on its dependency order. After rootfs_initcall is complete	 * this section can be safely removed.	 */	.iommu_table : AT(ADDR(.iommu_table) - LOAD_OFFSET) {		__iommu_table = .;		*(.iommu_table)		__iommu_table_end = .;	} 	. = ALIGN(8);	.apicdrivers : AT(ADDR(.apicdrivers) - LOAD_OFFSET) {		__apicdrivers = .;		*(.apicdrivers);		__apicdrivers_end = .;	} 	. = ALIGN(8);	/*	 * .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_X86_64) || !defined(CONFIG_SMP)	PERCPU_SECTION(INTERNODE_CACHE_BYTES)#endif 	. = ALIGN(PAGE_SIZE); 	/* freed after init ends here */	.init.end : AT(ADDR(.init.end) - LOAD_OFFSET) {		__init_end = .;	} 	/*	 * smp_locks might be freed after init	 * start/end must be page aligned	 */	. = ALIGN(PAGE_SIZE);	.smp_locks : AT(ADDR(.smp_locks) - LOAD_OFFSET) {		__smp_locks = .;		*(.smp_locks)		. = ALIGN(PAGE_SIZE);		__smp_locks_end = .;	} #ifdef CONFIG_X86_64	.data_nosave : AT(ADDR(.data_nosave) - LOAD_OFFSET) {		NOSAVE_DATA	}#endif 	/* BSS */	. = ALIGN(PAGE_SIZE);	.bss : AT(ADDR(.bss) - LOAD_OFFSET) {		__bss_start = .;		*(.bss..page_aligned)		*(.bss)		. = ALIGN(PAGE_SIZE);		__bss_stop = .;	} 	. = ALIGN(PAGE_SIZE);	.brk : AT(ADDR(.brk) - LOAD_OFFSET) {		__brk_base = .;		. += 64 * 1024;		/* 64k alignment slop space */		*(.brk_reservation)	/* areas brk users have reserved */		__brk_limit = .;	} 	. = ALIGN(PAGE_SIZE);		/* keep VO_INIT_SIZE page aligned */	_end = .;         STABS_DEBUG        DWARF_DEBUG 	/* Sections to be discarded */	DISCARDS	/DISCARD/ : {		*(.eh_frame)	}}  #ifdef CONFIG_X86_32/* * The ASSERT() sink to . is intentional, for binutils 2.14 compatibility: */. = ASSERT((_end - LOAD_OFFSET <= KERNEL_IMAGE_SIZE),	   "kernel image bigger than KERNEL_IMAGE_SIZE");#else/* * Per-cpu symbols which need to be offset from __per_cpu_load * for the boot processor. */#define INIT_PER_CPU(x) init_per_cpu__##x = x + __per_cpu_loadINIT_PER_CPU(gdt_page);INIT_PER_CPU(irq_stack_union); /* * Build-time check on the image size: */. = ASSERT((_end - _text <= KERNEL_IMAGE_SIZE),	   "kernel image bigger than KERNEL_IMAGE_SIZE"); #ifdef CONFIG_SMP. = ASSERT((irq_stack_union == 0),           "irq_stack_union is not at start of per-cpu area");#endif #endif /* CONFIG_X86_32 */ #ifdef CONFIG_KEXEC_CORE#include <asm/kexec.h> . = ASSERT(kexec_control_code_size <= KEXEC_CONTROL_CODE_MAX_SIZE,           "kexec control code size is too big");#endif