/arch/x86/kernel/vmlinux.lds.S
Assembly | 433 lines | 433 code | 0 blank | 0 comment | 1 complexity | f75e906ec0159fe17e017ed66ae903c1 MD5 | raw file
Possible License(s): GPL-2.0, LGPL-2.0, AGPL-1.0
- /*
- * 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.
- */
- #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_32
- OUTPUT_ARCH(i386)
- ENTRY(phys_startup_32)
- jiffies = jiffies_64;
- #else
- OUTPUT_ARCH(i386:x86-64)
- ENTRY(phys_startup_64)
- jiffies_64 = jiffies;
- #endif
- PHDRS {
- text PT_LOAD FLAGS(5); /* R_E */
- data PT_LOAD FLAGS(7); /* RWE */
- #ifdef CONFIG_X86_64
- user PT_LOAD FLAGS(7); /* RWE */
- data.init PT_LOAD FLAGS(7); /* RWE */
- #ifdef CONFIG_SMP
- percpu PT_LOAD FLAGS(7); /* RWE */
- #endif
- data.init2 PT_LOAD FLAGS(7); /* RWE */
- #endif
- note PT_NOTE FLAGS(0); /* ___ */
- }
- SECTIONS
- {
- #ifdef CONFIG_X86_32
- . = LOAD_OFFSET + LOAD_PHYSICAL_ADDR;
- phys_startup_32 = startup_32 - LOAD_OFFSET;
- #else
- . = __START_KERNEL;
- phys_startup_64 = startup_64 - LOAD_OFFSET;
- #endif
- /* Text and read-only data */
- /* bootstrapping code */
- .text.head : AT(ADDR(.text.head) - LOAD_OFFSET) {
- _text = .;
- *(.text.head)
- } :text = 0x9090
- /* The rest of the text */
- .text : AT(ADDR(.text) - LOAD_OFFSET) {
- #ifdef CONFIG_X86_32
- /* not really needed, already page aligned */
- . = ALIGN(PAGE_SIZE);
- *(.text.page_aligned)
- #endif
- . = ALIGN(8);
- _stext = .;
- 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
- /* Data */
- . = ALIGN(PAGE_SIZE);
- .data : AT(ADDR(.data) - LOAD_OFFSET) {
- /* Start of data section */
- _sdata = .;
- DATA_DATA
- CONSTRUCTORS
- #ifdef CONFIG_X86_64
- /* End of data section */
- _edata = .;
- #endif
- } :data
- #ifdef CONFIG_X86_32
- /* 32 bit has nosave before _edata */
- . = ALIGN(PAGE_SIZE);
- .data_nosave : AT(ADDR(.data_nosave) - LOAD_OFFSET) {
- __nosave_begin = .;
- *(.data.nosave)
- . = ALIGN(PAGE_SIZE);
- __nosave_end = .;
- }
- #endif
- . = ALIGN(PAGE_SIZE);
- .data.page_aligned : AT(ADDR(.data.page_aligned) - LOAD_OFFSET) {
- *(.data.page_aligned)
- *(.data.idt)
- }
- #ifdef CONFIG_X86_32
- . = ALIGN(32);
- #else
- . = ALIGN(PAGE_SIZE);
- . = ALIGN(CONFIG_X86_L1_CACHE_BYTES);
- #endif
- .data.cacheline_aligned :
- AT(ADDR(.data.cacheline_aligned) - LOAD_OFFSET) {
- *(.data.cacheline_aligned)
- }
- /* rarely changed data like cpu maps */
- #ifdef CONFIG_X86_32
- . = ALIGN(32);
- #else
- . = ALIGN(CONFIG_X86_INTERNODE_CACHE_BYTES);
- #endif
- .data.read_mostly : AT(ADDR(.data.read_mostly) - LOAD_OFFSET) {
- *(.data.read_mostly)
- #ifdef CONFIG_X86_32
- /* End of data section */
- _edata = .;
- #endif
- }
- #ifdef CONFIG_X86_64
- #define VSYSCALL_ADDR (-10*1024*1024)
- #define VSYSCALL_PHYS_ADDR ((LOADADDR(.data.read_mostly) + \
- SIZEOF(.data.read_mostly) + 4095) & ~(4095))
- #define VSYSCALL_VIRT_ADDR ((ADDR(.data.read_mostly) + \
- SIZEOF(.data.read_mostly) + 4095) & ~(4095))
- #define VLOAD_OFFSET (VSYSCALL_ADDR - VSYSCALL_PHYS_ADDR)
- #define VLOAD(x) (ADDR(x) - VLOAD_OFFSET)
- #define VVIRT_OFFSET (VSYSCALL_ADDR - VSYSCALL_VIRT_ADDR)
- #define VVIRT(x) (ADDR(x) - VVIRT_OFFSET)
- . = VSYSCALL_ADDR;
- .vsyscall_0 : AT(VSYSCALL_PHYS_ADDR) {
- *(.vsyscall_0)
- } :user
- __vsyscall_0 = VSYSCALL_VIRT_ADDR;
- . = ALIGN(CONFIG_X86_L1_CACHE_BYTES);
- .vsyscall_fn : AT(VLOAD(.vsyscall_fn)) {
- *(.vsyscall_fn)
- }
- . = ALIGN(CONFIG_X86_L1_CACHE_BYTES);
- .vsyscall_gtod_data : AT(VLOAD(.vsyscall_gtod_data)) {
- *(.vsyscall_gtod_data)
- }
- vsyscall_gtod_data = VVIRT(.vsyscall_gtod_data);
- .vsyscall_clock : AT(VLOAD(.vsyscall_clock)) {
- *(.vsyscall_clock)
- }
- vsyscall_clock = VVIRT(.vsyscall_clock);
- .vsyscall_1 ADDR(.vsyscall_0) + 1024: AT(VLOAD(.vsyscall_1)) {
- *(.vsyscall_1)
- }
- .vsyscall_2 ADDR(.vsyscall_0) + 2048: AT(VLOAD(.vsyscall_2)) {
- *(.vsyscall_2)
- }
- .vgetcpu_mode : AT(VLOAD(.vgetcpu_mode)) {
- *(.vgetcpu_mode)
- }
- vgetcpu_mode = VVIRT(.vgetcpu_mode);
- . = ALIGN(CONFIG_X86_L1_CACHE_BYTES);
- .jiffies : AT(VLOAD(.jiffies)) {
- *(.jiffies)
- }
- jiffies = VVIRT(.jiffies);
- .vsyscall_3 ADDR(.vsyscall_0) + 3072: AT(VLOAD(.vsyscall_3)) {
- *(.vsyscall_3)
- }
- . = VSYSCALL_VIRT_ADDR + PAGE_SIZE;
- #undef VSYSCALL_ADDR
- #undef VSYSCALL_PHYS_ADDR
- #undef VSYSCALL_VIRT_ADDR
- #undef VLOAD_OFFSET
- #undef VLOAD
- #undef VVIRT_OFFSET
- #undef VVIRT
- #endif /* CONFIG_X86_64 */
- /* init_task */
- . = ALIGN(THREAD_SIZE);
- .data.init_task : AT(ADDR(.data.init_task) - LOAD_OFFSET) {
- *(.data.init_task)
- }
- #ifdef CONFIG_X86_64
- :data.init
- #endif
- /*
- * 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)
- __smp_locks_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 = .; /* paired with __init_end */
- _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(8);
- .parainstructions : AT(ADDR(.parainstructions) - LOAD_OFFSET) {
- __parainstructions = .;
- *(.parainstructions)
- __parainstructions_end = .;
- }
- . = ALIGN(8);
- .altinstructions : AT(ADDR(.altinstructions) - LOAD_OFFSET) {
- __alt_instructions = .;
- *(.altinstructions)
- __alt_instructions_end = .;
- }
- .altinstr_replacement : AT(ADDR(.altinstr_replacement) - LOAD_OFFSET) {
- *(.altinstr_replacement)
- }
- /*
- * .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
- }
- #ifdef CONFIG_BLK_DEV_INITRD
- . = ALIGN(PAGE_SIZE);
- .init.ramfs : AT(ADDR(.init.ramfs) - LOAD_OFFSET) {
- __initramfs_start = .;
- *(.init.ramfs)
- __initramfs_end = .;
- }
- #endif
- #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 - __data_nosave - should
- * start another section data.init2. Also, pda should be at the head of
- * percpu area. Preallocate it and define the percpu offset symbol
- * so that it can be accessed as a percpu variable.
- */
- . = ALIGN(PAGE_SIZE);
- PERCPU_VADDR(0, :percpu)
- #else
- PERCPU(PAGE_SIZE)
- #endif
- . = 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) {
- . = ALIGN(PAGE_SIZE);
- __nosave_begin = .;
- *(.data.nosave)
- . = ALIGN(PAGE_SIZE);
- __nosave_end = .;
- } :data.init2
- /* use another section data.init2, see PERCPU_VADDR() above */
- #endif
- /* BSS */
- . = ALIGN(PAGE_SIZE);
- .bss : AT(ADDR(.bss) - LOAD_OFFSET) {
- __bss_start = .;
- *(.bss.page_aligned)
- *(.bss)
- . = ALIGN(4);
- __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 = .;
- }
- .end : AT(ADDR(.end) - LOAD_OFFSET) {
- _end = .;
- }
- /* Sections to be discarded */
- /DISCARD/ : {
- *(.exitcall.exit)
- *(.eh_frame)
- *(.discard)
- }
- STABS_DEBUG
- DWARF_DEBUG
- }
- #ifdef CONFIG_X86_32
- 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 = per_cpu__##x + __per_cpu_load
- INIT_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((per_cpu__irq_stack_union == 0),
- "irq_stack_union is not at start of per-cpu area");
- #endif
- #endif /* CONFIG_X86_32 */
- #ifdef CONFIG_KEXEC
- #include <asm/kexec.h>
- ASSERT(kexec_control_code_size <= KEXEC_CONTROL_CODE_MAX_SIZE,
- "kexec control code size is too big")
- #endif