/* SPDX-License-Identifier: GPL-2.0 *//* * 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. */ #define LOAD_OFFSET __START_KERNEL_map #define RUNTIME_DISCARD_EXIT#define EMITS_PT_NOTE#define RO_EXCEPTION_TABLE_ALIGN	16 #include <asm-generic/vmlinux.lds.h>#include <asm/asm-offsets.h>#include <asm/thread_info.h>#include <asm/page_types.h>#include <asm/orc_lookup.h>#include <asm/cache.h>#include <asm/boot.h>#include <asm/kexec.h> #undef i386     /* in case the preprocessor is a 32bit one */ OUTPUT_FORMAT(CONFIG_OUTPUT_FORMAT) #ifdef CONFIG_X86_32OUTPUT_ARCH(i386)ENTRY(phys_startup_32)#elseOUTPUT_ARCH(i386:x86-64)ENTRY(phys_startup_64)#endif jiffies = jiffies_64;const_current_task = current_task;const_cpu_current_top_of_stack = cpu_current_top_of_stack; #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 X86_ALIGN_RODATA_BEGIN	. = ALIGN(HPAGE_SIZE); #define X86_ALIGN_RODATA_END					\		. = ALIGN(HPAGE_SIZE);				\		__end_rodata_hpage_align = .;			\		__end_rodata_aligned = .; #if defined(CONFIG_MITIGATION_PAGE_TABLE_ISOLATION) || defined(CONFIG_MITIGATION_SRSO)#define ALIGN_ENTRY_TEXT_BEGIN	. = ALIGN(PMD_SIZE);#define ALIGN_ENTRY_TEXT_END	. = ALIGN(PMD_SIZE);#else#define ALIGN_ENTRY_TEXT_BEGIN#define ALIGN_ENTRY_TEXT_END#endif #else #define X86_ALIGN_RODATA_BEGIN#define X86_ALIGN_RODATA_END					\		. = ALIGN(PAGE_SIZE);				\		__end_rodata_aligned = .; #define ALIGN_ENTRY_TEXT_BEGIN#define ALIGN_ENTRY_TEXT_END#endif #ifdef CONFIG_AMD_MEM_ENCRYPT/* * This section contains data which will be mapped as decrypted. Memory * encryption operates on a page basis. Make this section PMD-aligned * to avoid splitting the pages while mapping the section early. * * Note: We use a separate section so that only this section gets * decrypted to avoid exposing more than we wish. */#define BSS_DECRYPTED						\	. = ALIGN(PMD_SIZE);					\	__start_bss_decrypted = .;				\	__pi___start_bss_decrypted = .;				\	*(.bss..decrypted);					\	. = ALIGN(PAGE_SIZE);					\	__start_bss_decrypted_unused = .;			\	. = ALIGN(PMD_SIZE);					\	__end_bss_decrypted = .;				\	__pi___end_bss_decrypted = .;				\ #else#define BSS_DECRYPTED#endif #if defined(CONFIG_X86_64) && defined(CONFIG_KEXEC_CORE)#define KEXEC_RELOCATE_KERNEL					\	. = ALIGN(0x100);					\	__relocate_kernel_start = .;				\	*(.text..relocate_kernel);				\	*(.data..relocate_kernel);				\	__relocate_kernel_end = .; ASSERT(__relocate_kernel_end - __relocate_kernel_start <= KEXEC_CONTROL_CODE_MAX_SIZE,	"relocate_kernel code too large!")#else#define KEXEC_RELOCATE_KERNEL#endifPHDRS {	text PT_LOAD FLAGS(5);          /* R_E */	data PT_LOAD FLAGS(6);          /* RW_ */	note PT_NOTE FLAGS(0);          /* ___ */} SECTIONS{	. = __START_KERNEL;#ifdef CONFIG_X86_32	phys_startup_32 = ABSOLUTE(startup_32 - LOAD_OFFSET);#else	phys_startup_64 = ABSOLUTE(startup_64 - LOAD_OFFSET);#endif 	/* Text and read-only data */	.text :  AT(ADDR(.text) - LOAD_OFFSET) {		_text = .;		__pi__text = .;		_stext = .;		ALIGN_ENTRY_TEXT_BEGIN		*(.text..__x86.rethunk_untrain)		ENTRY_TEXT #ifdef CONFIG_MITIGATION_SRSO		/*		 * See the comment above srso_alias_untrain_ret()'s		 * definition.		 */		. = srso_alias_untrain_ret | (1 << 2) | (1 << 8) | (1 << 14) | (1 << 20);		*(.text..__x86.rethunk_safe)#endif		ALIGN_ENTRY_TEXT_END 		TEXT_TEXT		SCHED_TEXT		LOCK_TEXT		KPROBES_TEXT		SOFTIRQENTRY_TEXT#ifdef CONFIG_MITIGATION_RETPOLINE		*(.text..__x86.indirect_thunk)		*(.text..__x86.return_thunk)#endif		STATIC_CALL_TEXT		*(.gnu.warning) 	} :text = 0xcccccccc 	/* End of text section, which should occupy whole number of pages */	_etext = .;	. = ALIGN(PAGE_SIZE); 	X86_ALIGN_RODATA_BEGIN	RO_DATA(PAGE_SIZE)	X86_ALIGN_RODATA_END 	/* Data */	.data : AT(ADDR(.data) - LOAD_OFFSET) {		/* Start of data section */		_sdata = .; 		/* init_task */		INIT_TASK_DATA(THREAD_SIZE) 		/* equivalent to task_pt_regs(&init_task) */		__top_init_kernel_stack = __end_init_stack - TOP_OF_KERNEL_STACK_PADDING - PTREGS_SIZE; #ifdef CONFIG_X86_32		/* 32 bit has nosave before _edata */		NOSAVE_DATA#endif 		PAGE_ALIGNED_DATA(PAGE_SIZE) 		CACHE_HOT_DATA(L1_CACHE_BYTES) 		CACHELINE_ALIGNED_DATA(L1_CACHE_BYTES) 		DATA_DATA		CONSTRUCTORS		KEXEC_RELOCATE_KERNEL 		/* rarely changed data like cpu maps */		READ_MOSTLY_DATA(INTERNODE_CACHE_BYTES) 		/* End of data section */		_edata = .;	} :data 	BUG_TABLE 	ORC_UNWIND_TABLE 	/* 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 */	} 	INIT_TEXT_SECTION(PAGE_SIZE) 	/*	 * 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 cpu_feature_enabled() for an example.	 */	.altinstr_aux : AT(ADDR(.altinstr_aux) - LOAD_OFFSET) {		*(.altinstr_aux)		. = ALIGN(PAGE_SIZE);		__inittext_end = .;	} 	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 #ifdef CONFIG_MITIGATION_RETPOLINE	/*	 * List of instructions that call/jmp/jcc to retpoline thunks	 * __x86_indirect_thunk_*(). These instructions can be patched along	 * with alternatives, after which the section can be freed.	 */	. = ALIGN(8);	.retpoline_sites : AT(ADDR(.retpoline_sites) - LOAD_OFFSET) {		__retpoline_sites = .;		*(.retpoline_sites)		__retpoline_sites_end = .;	} 	. = ALIGN(8);	.return_sites : AT(ADDR(.return_sites) - LOAD_OFFSET) {		__return_sites = .;		*(.return_sites)		__return_sites_end = .;	} 	. = ALIGN(8);	.call_sites : AT(ADDR(.call_sites) - LOAD_OFFSET) {		__call_sites = .;		*(.call_sites)		__call_sites_end = .;	}#endif #ifdef CONFIG_X86_KERNEL_IBT	. = ALIGN(8);	.ibt_endbr_seal : AT(ADDR(.ibt_endbr_seal) - LOAD_OFFSET) {		__ibt_endbr_seal = .;		*(.ibt_endbr_seal)		__ibt_endbr_seal_end = .;	}#endif #ifdef CONFIG_FINEIBT	. = ALIGN(8);	.cfi_sites : AT(ADDR(.cfi_sites) - LOAD_OFFSET) {		__cfi_sites = .;		*(.cfi_sites)		__cfi_sites_end = .;	}#endif 	/*	 * 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)	} 	. = ALIGN(8);	.apicdrivers : AT(ADDR(.apicdrivers) - LOAD_OFFSET) {		__apicdrivers = .;		*(.apicdrivers);		__apicdrivers_end = .;	} 	. = ALIGN(8);	/*	 * .exit.text is discarded at runtime, not link time, to deal with	 *  references from .altinstructions	 */	.exit.text : AT(ADDR(.exit.text) - LOAD_OFFSET) {		EXIT_TEXT	} 	.exit.data : AT(ADDR(.exit.data) - LOAD_OFFSET) {		EXIT_DATA	} 	PERCPU_SECTION(L1_CACHE_BYTES)	ASSERT(__per_cpu_hot_end - __per_cpu_hot_start <= 64, "percpu cache hot data too large") 	RUNTIME_CONST_VARIABLES	RUNTIME_CONST(ptr, USER_PTR_MAX) 	. = ALIGN(PAGE_SIZE); 	/* freed after init ends here */	.init.end : AT(ADDR(.init.end) - LOAD_OFFSET) {		__init_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)		. = ALIGN(PAGE_SIZE);		*(BSS_MAIN)		BSS_DECRYPTED		. = ALIGN(PAGE_SIZE);		__bss_stop = .;	} 	/*	 * The memory occupied from _text to here, __end_of_kernel_reserve, is	 * automatically reserved in setup_arch(). Anything after here must be	 * explicitly reserved using memblock_reserve() or it will be discarded	 * and treated as available memory.	 */	__end_of_kernel_reserve = .; 	. = ALIGN(PAGE_SIZE);	.brk : AT(ADDR(.brk) - LOAD_OFFSET) {		__brk_base = .;		. += 64 * 1024;		/* 64k alignment slop space */		*(.bss..brk)		/* areas brk users have reserved */		__brk_limit = .;	} 	. = ALIGN(PAGE_SIZE);		/* keep VO_INIT_SIZE page aligned */	_end = .;	__pi__end = .; #ifdef CONFIG_AMD_MEM_ENCRYPT	/*	 * Early scratch/workarea section: Lives outside of the kernel proper	 * (_text - _end).	 *	 * Resides after _end because even though the .brk section is after	 * __end_of_kernel_reserve, the .brk section is later reserved as a	 * part of the kernel. Since it is located after __end_of_kernel_reserve	 * it will be discarded and become part of the available memory. As	 * such, it can only be used by very early boot code and must not be	 * needed afterwards.	 *	 * Currently used by SME for performing in-place encryption of the	 * kernel during boot. Resides on a 2MB boundary to simplify the	 * pagetable setup used for SME in-place encryption.	 */	. = ALIGN(HPAGE_SIZE);	.init.scratch : AT(ADDR(.init.scratch) - LOAD_OFFSET) {		__init_scratch_begin = .;		*(.init.scratch)		. = ALIGN(HPAGE_SIZE);		__init_scratch_end = .;	}#endif 	STABS_DEBUG	DWARF_DEBUG	PROPELLER_DATA	MODINFO	ELF_DETAILS 	DISCARDS 	/*	 * Make sure that the .got.plt is either completely empty or it	 * contains only the lazy dispatch entries.	 */	.got.plt (INFO) : { *(.got.plt) }	ASSERT(SIZEOF(.got.plt) == 0 ||#ifdef CONFIG_X86_64	       SIZEOF(.got.plt) == 0x18,#else	       SIZEOF(.got.plt) == 0xc,#endif	       "Unexpected GOT/PLT entries detected!") 	/*	 * Sections that should stay zero sized, which is safer to	 * explicitly check instead of blindly discarding.	 */	.got : {		*(.got) *(.igot.*)	}	ASSERT(SIZEOF(.got) == 0, "Unexpected GOT entries detected!") 	.plt : {		*(.plt) *(.plt.*) *(.iplt)	}	ASSERT(SIZEOF(.plt) == 0, "Unexpected run-time procedure linkages detected!") 	.rel.dyn : {		*(.rel.*) *(.rel_*)	}	ASSERT(SIZEOF(.rel.dyn) == 0, "Unexpected run-time relocations (.rel) detected!") 	.rela.dyn : {		*(.rela.*) *(.rela_*)	}	ASSERT(SIZEOF(.rela.dyn) == 0, "Unexpected run-time relocations (.rela) detected!")} /* * COMPILE_TEST kernels can be large - CONFIG_KASAN, for example, can cause * this.  Let's assume that nobody will be running a COMPILE_TEST kernel and * let's assert that fuller build coverage is more valuable than being able to * run a COMPILE_TEST kernel. */#ifndef CONFIG_COMPILE_TEST/* * The ASSERT() sync to . is intentional, for binutils 2.14 compatibility: */. = ASSERT((_end - LOAD_OFFSET <= KERNEL_IMAGE_SIZE),	   "kernel image bigger than KERNEL_IMAGE_SIZE");#endif /* needed for Clang - see arch/x86/entry/entry.S */PROVIDE(__ref_stack_chk_guard = __stack_chk_guard); #ifdef CONFIG_X86_64 #ifdef CONFIG_MITIGATION_UNRET_ENTRY. = ASSERT((retbleed_return_thunk & 0x3f) == 0, "retbleed_return_thunk not cacheline-aligned");#endif #ifdef CONFIG_MITIGATION_SRSO. = ASSERT((srso_safe_ret & 0x3f) == 0, "srso_safe_ret not cacheline-aligned");/* * GNU ld cannot do XOR until 2.41. * https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=f6f78318fca803c4907fb8d7f6ded8295f1947b1 * * LLVM lld cannot do XOR until lld-17. * https://github.com/llvm/llvm-project/commit/fae96104d4378166cbe5c875ef8ed808a356f3fb * * Instead do: (A | B) - (A & B) in order to compute the XOR * of the two function addresses: */. = ASSERT(((ABSOLUTE(srso_alias_untrain_ret) | srso_alias_safe_ret) -		(ABSOLUTE(srso_alias_untrain_ret) & srso_alias_safe_ret)) == ((1 << 2) | (1 << 8) | (1 << 14) | (1 << 20)),

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