| /* |
| * 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 |
| |
| #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 = startup_32 - LOAD_OFFSET; |
| #else |
| . = __START_KERNEL; |
| phys_startup_64 = startup_64 - LOAD_OFFSET; |
| #endif |
| |
| /* Text and read-only data */ |
| .text : AT(ADDR(.text) - LOAD_OFFSET) { |
| _text = .; |
| /* bootstrapping code */ |
| HEAD_TEXT |
| . = ALIGN(8); |
| _stext = .; |
| TEXT_TEXT |
| SCHED_TEXT |
| LOCK_TEXT |
| KPROBES_TEXT |
| ENTRY_TEXT |
| IRQENTRY_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 |
| |
| |
| . = 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 |
| |
| 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 = .; |
| } |
| |
| _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_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((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 |
| |