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486 lines
12 KiB
486 lines
12 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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/* |
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* ld script for the x86 kernel |
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* |
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* Historic 32-bit version written by Martin Mares <mj@atrey.karlin.mff.cuni.cz> |
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* |
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* Modernisation, unification and other changes and fixes: |
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* Copyright (C) 2007-2009 Sam Ravnborg <sam@ravnborg.org> |
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* |
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* |
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* Don't define absolute symbols until and unless you know that symbol |
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* value is should remain constant even if kernel image is relocated |
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* at run time. Absolute symbols are not relocated. If symbol value should |
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* change if kernel is relocated, make the symbol section relative and |
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* put it inside the section definition. |
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*/ |
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#ifdef CONFIG_X86_32 |
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#define LOAD_OFFSET __PAGE_OFFSET |
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#else |
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#define LOAD_OFFSET __START_KERNEL_map |
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#endif |
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#define RUNTIME_DISCARD_EXIT |
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#define EMITS_PT_NOTE |
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#define RO_EXCEPTION_TABLE_ALIGN 16 |
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#include <asm-generic/vmlinux.lds.h> |
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#include <asm/asm-offsets.h> |
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#include <asm/thread_info.h> |
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#include <asm/page_types.h> |
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#include <asm/orc_lookup.h> |
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#include <asm/cache.h> |
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#include <asm/boot.h> |
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#undef i386 /* in case the preprocessor is a 32bit one */ |
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OUTPUT_FORMAT(CONFIG_OUTPUT_FORMAT) |
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#ifdef CONFIG_X86_32 |
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OUTPUT_ARCH(i386) |
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ENTRY(phys_startup_32) |
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#else |
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OUTPUT_ARCH(i386:x86-64) |
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ENTRY(phys_startup_64) |
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#endif |
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jiffies = jiffies_64; |
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#if defined(CONFIG_X86_64) |
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/* |
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* On 64-bit, align RODATA to 2MB so we retain large page mappings for |
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* boundaries spanning kernel text, rodata and data sections. |
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* |
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* However, kernel identity mappings will have different RWX permissions |
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* to the pages mapping to text and to the pages padding (which are freed) the |
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* text section. Hence kernel identity mappings will be broken to smaller |
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* pages. For 64-bit, kernel text and kernel identity mappings are different, |
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* so we can enable protection checks as well as retain 2MB large page |
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* mappings for kernel text. |
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*/ |
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#define X86_ALIGN_RODATA_BEGIN . = ALIGN(HPAGE_SIZE); |
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#define X86_ALIGN_RODATA_END \ |
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. = ALIGN(HPAGE_SIZE); \ |
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__end_rodata_hpage_align = .; \ |
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__end_rodata_aligned = .; |
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#define ALIGN_ENTRY_TEXT_BEGIN . = ALIGN(PMD_SIZE); |
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#define ALIGN_ENTRY_TEXT_END . = ALIGN(PMD_SIZE); |
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/* |
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* This section contains data which will be mapped as decrypted. Memory |
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* encryption operates on a page basis. Make this section PMD-aligned |
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* to avoid splitting the pages while mapping the section early. |
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* |
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* Note: We use a separate section so that only this section gets |
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* decrypted to avoid exposing more than we wish. |
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*/ |
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#define BSS_DECRYPTED \ |
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. = ALIGN(PMD_SIZE); \ |
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__start_bss_decrypted = .; \ |
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*(.bss..decrypted); \ |
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. = ALIGN(PAGE_SIZE); \ |
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__start_bss_decrypted_unused = .; \ |
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. = ALIGN(PMD_SIZE); \ |
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__end_bss_decrypted = .; \ |
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#else |
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#define X86_ALIGN_RODATA_BEGIN |
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#define X86_ALIGN_RODATA_END \ |
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. = ALIGN(PAGE_SIZE); \ |
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__end_rodata_aligned = .; |
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#define ALIGN_ENTRY_TEXT_BEGIN |
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#define ALIGN_ENTRY_TEXT_END |
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#define BSS_DECRYPTED |
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#endif |
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PHDRS { |
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text PT_LOAD FLAGS(5); /* R_E */ |
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data PT_LOAD FLAGS(6); /* RW_ */ |
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#ifdef CONFIG_X86_64 |
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#ifdef CONFIG_SMP |
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percpu PT_LOAD FLAGS(6); /* RW_ */ |
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#endif |
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init PT_LOAD FLAGS(7); /* RWE */ |
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#endif |
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note PT_NOTE FLAGS(0); /* ___ */ |
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} |
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SECTIONS |
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{ |
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#ifdef CONFIG_X86_32 |
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. = LOAD_OFFSET + LOAD_PHYSICAL_ADDR; |
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phys_startup_32 = ABSOLUTE(startup_32 - LOAD_OFFSET); |
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#else |
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. = __START_KERNEL; |
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phys_startup_64 = ABSOLUTE(startup_64 - LOAD_OFFSET); |
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#endif |
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/* Text and read-only data */ |
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.text : AT(ADDR(.text) - LOAD_OFFSET) { |
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_text = .; |
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_stext = .; |
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/* bootstrapping code */ |
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HEAD_TEXT |
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TEXT_TEXT |
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SCHED_TEXT |
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CPUIDLE_TEXT |
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LOCK_TEXT |
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KPROBES_TEXT |
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ALIGN_ENTRY_TEXT_BEGIN |
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ENTRY_TEXT |
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ALIGN_ENTRY_TEXT_END |
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SOFTIRQENTRY_TEXT |
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STATIC_CALL_TEXT |
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*(.fixup) |
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*(.gnu.warning) |
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#ifdef CONFIG_RETPOLINE |
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__indirect_thunk_start = .; |
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*(.text.__x86.indirect_thunk) |
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__indirect_thunk_end = .; |
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#endif |
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} :text =0xcccc |
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/* End of text section, which should occupy whole number of pages */ |
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_etext = .; |
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. = ALIGN(PAGE_SIZE); |
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X86_ALIGN_RODATA_BEGIN |
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RO_DATA(PAGE_SIZE) |
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X86_ALIGN_RODATA_END |
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/* Data */ |
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.data : AT(ADDR(.data) - LOAD_OFFSET) { |
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/* Start of data section */ |
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_sdata = .; |
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/* init_task */ |
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INIT_TASK_DATA(THREAD_SIZE) |
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#ifdef CONFIG_X86_32 |
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/* 32 bit has nosave before _edata */ |
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NOSAVE_DATA |
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#endif |
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PAGE_ALIGNED_DATA(PAGE_SIZE) |
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CACHELINE_ALIGNED_DATA(L1_CACHE_BYTES) |
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DATA_DATA |
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CONSTRUCTORS |
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/* rarely changed data like cpu maps */ |
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READ_MOSTLY_DATA(INTERNODE_CACHE_BYTES) |
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/* End of data section */ |
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_edata = .; |
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} :data |
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BUG_TABLE |
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ORC_UNWIND_TABLE |
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. = ALIGN(PAGE_SIZE); |
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__vvar_page = .; |
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.vvar : AT(ADDR(.vvar) - LOAD_OFFSET) { |
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/* work around gold bug 13023 */ |
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__vvar_beginning_hack = .; |
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/* Place all vvars at the offsets in asm/vvar.h. */ |
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#define EMIT_VVAR(name, offset) \ |
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. = __vvar_beginning_hack + offset; \ |
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*(.vvar_ ## name) |
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#include <asm/vvar.h> |
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#undef EMIT_VVAR |
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/* |
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* Pad the rest of the page with zeros. Otherwise the loader |
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* can leave garbage here. |
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*/ |
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. = __vvar_beginning_hack + PAGE_SIZE; |
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} :data |
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. = ALIGN(__vvar_page + PAGE_SIZE, PAGE_SIZE); |
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/* Init code and data - will be freed after init */ |
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. = ALIGN(PAGE_SIZE); |
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.init.begin : AT(ADDR(.init.begin) - LOAD_OFFSET) { |
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__init_begin = .; /* paired with __init_end */ |
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} |
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#if defined(CONFIG_X86_64) && defined(CONFIG_SMP) |
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/* |
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* percpu offsets are zero-based on SMP. PERCPU_VADDR() changes the |
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* output PHDR, so the next output section - .init.text - should |
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* start another segment - init. |
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*/ |
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PERCPU_VADDR(INTERNODE_CACHE_BYTES, 0, :percpu) |
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ASSERT(SIZEOF(.data..percpu) < CONFIG_PHYSICAL_START, |
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"per-CPU data too large - increase CONFIG_PHYSICAL_START") |
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#endif |
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INIT_TEXT_SECTION(PAGE_SIZE) |
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#ifdef CONFIG_X86_64 |
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:init |
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#endif |
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/* |
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* Section for code used exclusively before alternatives are run. All |
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* references to such code must be patched out by alternatives, normally |
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* by using X86_FEATURE_ALWAYS CPU feature bit. |
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* |
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* See static_cpu_has() for an example. |
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*/ |
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.altinstr_aux : AT(ADDR(.altinstr_aux) - LOAD_OFFSET) { |
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*(.altinstr_aux) |
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} |
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INIT_DATA_SECTION(16) |
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.x86_cpu_dev.init : AT(ADDR(.x86_cpu_dev.init) - LOAD_OFFSET) { |
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__x86_cpu_dev_start = .; |
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*(.x86_cpu_dev.init) |
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__x86_cpu_dev_end = .; |
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} |
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#ifdef CONFIG_X86_INTEL_MID |
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.x86_intel_mid_dev.init : AT(ADDR(.x86_intel_mid_dev.init) - \ |
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LOAD_OFFSET) { |
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__x86_intel_mid_dev_start = .; |
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*(.x86_intel_mid_dev.init) |
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__x86_intel_mid_dev_end = .; |
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} |
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#endif |
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/* |
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* start address and size of operations which during runtime |
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* can be patched with virtualization friendly instructions or |
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* baremetal native ones. Think page table operations. |
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* Details in paravirt_types.h |
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*/ |
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. = ALIGN(8); |
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.parainstructions : AT(ADDR(.parainstructions) - LOAD_OFFSET) { |
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__parainstructions = .; |
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*(.parainstructions) |
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__parainstructions_end = .; |
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} |
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/* |
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* struct alt_inst entries. From the header (alternative.h): |
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* "Alternative instructions for different CPU types or capabilities" |
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* Think locking instructions on spinlocks. |
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*/ |
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. = ALIGN(8); |
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.altinstructions : AT(ADDR(.altinstructions) - LOAD_OFFSET) { |
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__alt_instructions = .; |
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*(.altinstructions) |
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__alt_instructions_end = .; |
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} |
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/* |
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* And here are the replacement instructions. The linker sticks |
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* them as binary blobs. The .altinstructions has enough data to |
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* get the address and the length of them to patch the kernel safely. |
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*/ |
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.altinstr_replacement : AT(ADDR(.altinstr_replacement) - LOAD_OFFSET) { |
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*(.altinstr_replacement) |
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} |
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/* |
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* struct iommu_table_entry entries are injected in this section. |
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* It is an array of IOMMUs which during run time gets sorted depending |
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* on its dependency order. After rootfs_initcall is complete |
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* this section can be safely removed. |
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*/ |
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.iommu_table : AT(ADDR(.iommu_table) - LOAD_OFFSET) { |
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__iommu_table = .; |
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*(.iommu_table) |
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__iommu_table_end = .; |
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} |
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. = ALIGN(8); |
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.apicdrivers : AT(ADDR(.apicdrivers) - LOAD_OFFSET) { |
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__apicdrivers = .; |
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*(.apicdrivers); |
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__apicdrivers_end = .; |
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} |
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. = ALIGN(8); |
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/* |
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* .exit.text is discarded at runtime, not link time, to deal with |
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* references from .altinstructions |
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*/ |
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.exit.text : AT(ADDR(.exit.text) - LOAD_OFFSET) { |
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EXIT_TEXT |
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} |
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.exit.data : AT(ADDR(.exit.data) - LOAD_OFFSET) { |
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EXIT_DATA |
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} |
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#if !defined(CONFIG_X86_64) || !defined(CONFIG_SMP) |
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PERCPU_SECTION(INTERNODE_CACHE_BYTES) |
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#endif |
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. = ALIGN(PAGE_SIZE); |
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/* freed after init ends here */ |
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.init.end : AT(ADDR(.init.end) - LOAD_OFFSET) { |
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__init_end = .; |
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} |
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/* |
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* smp_locks might be freed after init |
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* start/end must be page aligned |
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*/ |
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. = ALIGN(PAGE_SIZE); |
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.smp_locks : AT(ADDR(.smp_locks) - LOAD_OFFSET) { |
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__smp_locks = .; |
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*(.smp_locks) |
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. = ALIGN(PAGE_SIZE); |
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__smp_locks_end = .; |
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} |
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#ifdef CONFIG_X86_64 |
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.data_nosave : AT(ADDR(.data_nosave) - LOAD_OFFSET) { |
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NOSAVE_DATA |
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} |
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#endif |
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/* BSS */ |
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. = ALIGN(PAGE_SIZE); |
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.bss : AT(ADDR(.bss) - LOAD_OFFSET) { |
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__bss_start = .; |
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*(.bss..page_aligned) |
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. = ALIGN(PAGE_SIZE); |
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*(BSS_MAIN) |
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BSS_DECRYPTED |
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. = ALIGN(PAGE_SIZE); |
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__bss_stop = .; |
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} |
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/* |
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* The memory occupied from _text to here, __end_of_kernel_reserve, is |
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* automatically reserved in setup_arch(). Anything after here must be |
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* explicitly reserved using memblock_reserve() or it will be discarded |
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* and treated as available memory. |
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*/ |
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__end_of_kernel_reserve = .; |
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. = ALIGN(PAGE_SIZE); |
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.brk : AT(ADDR(.brk) - LOAD_OFFSET) { |
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__brk_base = .; |
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. += 64 * 1024; /* 64k alignment slop space */ |
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*(.brk_reservation) /* areas brk users have reserved */ |
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__brk_limit = .; |
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} |
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. = ALIGN(PAGE_SIZE); /* keep VO_INIT_SIZE page aligned */ |
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_end = .; |
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#ifdef CONFIG_AMD_MEM_ENCRYPT |
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/* |
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* Early scratch/workarea section: Lives outside of the kernel proper |
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* (_text - _end). |
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* |
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* Resides after _end because even though the .brk section is after |
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* __end_of_kernel_reserve, the .brk section is later reserved as a |
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* part of the kernel. Since it is located after __end_of_kernel_reserve |
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* it will be discarded and become part of the available memory. As |
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* such, it can only be used by very early boot code and must not be |
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* needed afterwards. |
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* |
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* Currently used by SME for performing in-place encryption of the |
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* kernel during boot. Resides on a 2MB boundary to simplify the |
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* pagetable setup used for SME in-place encryption. |
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*/ |
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. = ALIGN(HPAGE_SIZE); |
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.init.scratch : AT(ADDR(.init.scratch) - LOAD_OFFSET) { |
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__init_scratch_begin = .; |
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*(.init.scratch) |
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. = ALIGN(HPAGE_SIZE); |
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__init_scratch_end = .; |
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} |
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#endif |
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STABS_DEBUG |
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DWARF_DEBUG |
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ELF_DETAILS |
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DISCARDS |
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/* |
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* Make sure that the .got.plt is either completely empty or it |
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* contains only the lazy dispatch entries. |
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*/ |
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.got.plt (INFO) : { *(.got.plt) } |
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ASSERT(SIZEOF(.got.plt) == 0 || |
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#ifdef CONFIG_X86_64 |
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SIZEOF(.got.plt) == 0x18, |
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#else |
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SIZEOF(.got.plt) == 0xc, |
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#endif |
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"Unexpected GOT/PLT entries detected!") |
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/* |
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* Sections that should stay zero sized, which is safer to |
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* explicitly check instead of blindly discarding. |
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*/ |
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.got : { |
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*(.got) *(.igot.*) |
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} |
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ASSERT(SIZEOF(.got) == 0, "Unexpected GOT entries detected!") |
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.plt : { |
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*(.plt) *(.plt.*) *(.iplt) |
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} |
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ASSERT(SIZEOF(.plt) == 0, "Unexpected run-time procedure linkages detected!") |
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.rel.dyn : { |
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*(.rel.*) *(.rel_*) |
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} |
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ASSERT(SIZEOF(.rel.dyn) == 0, "Unexpected run-time relocations (.rel) detected!") |
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.rela.dyn : { |
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*(.rela.*) *(.rela_*) |
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} |
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ASSERT(SIZEOF(.rela.dyn) == 0, "Unexpected run-time relocations (.rela) detected!") |
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} |
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/* |
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* The ASSERT() sink to . is intentional, for binutils 2.14 compatibility: |
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*/ |
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. = ASSERT((_end - LOAD_OFFSET <= KERNEL_IMAGE_SIZE), |
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"kernel image bigger than KERNEL_IMAGE_SIZE"); |
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#ifdef CONFIG_X86_64 |
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/* |
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* Per-cpu symbols which need to be offset from __per_cpu_load |
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* for the boot processor. |
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*/ |
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#define INIT_PER_CPU(x) init_per_cpu__##x = ABSOLUTE(x) + __per_cpu_load |
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INIT_PER_CPU(gdt_page); |
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INIT_PER_CPU(fixed_percpu_data); |
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INIT_PER_CPU(irq_stack_backing_store); |
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#ifdef CONFIG_SMP |
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. = ASSERT((fixed_percpu_data == 0), |
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"fixed_percpu_data is not at start of per-cpu area"); |
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#endif |
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#endif /* CONFIG_X86_64 */ |
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#ifdef CONFIG_KEXEC_CORE |
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#include <asm/kexec.h> |
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. = ASSERT(kexec_control_code_size <= KEXEC_CONTROL_CODE_MAX_SIZE, |
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"kexec control code size is too big"); |
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#endif |
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