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https://kernel.googlesource.com/pub/scm/linux/kernel/git/stable/linux-stable.git
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39b3307294
This config allows to compile 64b kernel as PIE and to relocate it at any virtual address at runtime: this paves the way to KASLR. Runtime relocation is possible since relocation metadata are embedded into the kernel. Note that relocating at runtime introduces an overhead even if the kernel is loaded at the same address it was linked at and that the compiler options are those used in arm64 which uses the same RELA relocation format. Signed-off-by: Alexandre Ghiti <alexghiti@rivosinc.com> Link: https://lore.kernel.org/r/20230329045329.64565-4-alexghiti@rivosinc.com Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
168 lines
3.1 KiB
ArmAsm
168 lines
3.1 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (C) 2012 Regents of the University of California
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* Copyright (C) 2017 SiFive
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*/
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#define RO_EXCEPTION_TABLE_ALIGN 4
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#define RUNTIME_DISCARD_EXIT
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#ifdef CONFIG_XIP_KERNEL
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#include "vmlinux-xip.lds.S"
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#else
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#include <asm/pgtable.h>
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#define LOAD_OFFSET KERNEL_LINK_ADDR
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#include <asm/vmlinux.lds.h>
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#include <asm/page.h>
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#include <asm/cache.h>
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#include <asm/thread_info.h>
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#include <asm/set_memory.h>
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#include "image-vars.h"
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#include <linux/sizes.h>
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OUTPUT_ARCH(riscv)
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ENTRY(_start)
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jiffies = jiffies_64;
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SECTIONS
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{
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/* Beginning of code and text segment */
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. = LOAD_OFFSET;
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_start = .;
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HEAD_TEXT_SECTION
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. = ALIGN(PAGE_SIZE);
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.text : {
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_text = .;
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_stext = .;
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TEXT_TEXT
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SCHED_TEXT
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LOCK_TEXT
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KPROBES_TEXT
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ENTRY_TEXT
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IRQENTRY_TEXT
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SOFTIRQENTRY_TEXT
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_etext = .;
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}
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. = ALIGN(SECTION_ALIGN);
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__init_begin = .;
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__init_text_begin = .;
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.init.text : AT(ADDR(.init.text) - LOAD_OFFSET) ALIGN(SECTION_ALIGN) { \
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_sinittext = .; \
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INIT_TEXT \
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_einittext = .; \
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}
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. = ALIGN(8);
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__soc_early_init_table : {
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__soc_early_init_table_start = .;
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KEEP(*(__soc_early_init_table))
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__soc_early_init_table_end = .;
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}
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__soc_builtin_dtb_table : {
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__soc_builtin_dtb_table_start = .;
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KEEP(*(__soc_builtin_dtb_table))
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__soc_builtin_dtb_table_end = .;
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}
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/* we have to discard exit text and such at runtime, not link time */
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.exit.text :
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{
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EXIT_TEXT
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}
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__init_text_end = .;
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. = ALIGN(SECTION_ALIGN);
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#ifdef CONFIG_EFI
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. = ALIGN(PECOFF_SECTION_ALIGNMENT);
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__pecoff_text_end = .;
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#endif
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/* Start of init data section */
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__init_data_begin = .;
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INIT_DATA_SECTION(16)
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.init.bss : {
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*(.init.bss) /* from the EFI stub */
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}
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.exit.data :
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{
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EXIT_DATA
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}
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PERCPU_SECTION(L1_CACHE_BYTES)
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.rel.dyn : {
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*(.rel.dyn*)
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}
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__init_data_end = .;
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. = ALIGN(8);
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.alternative : {
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__alt_start = .;
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*(.alternative)
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__alt_end = .;
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}
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__init_end = .;
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/* Start of data section */
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_sdata = .;
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RO_DATA(SECTION_ALIGN)
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.srodata : {
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*(.srodata*)
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}
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. = ALIGN(SECTION_ALIGN);
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_data = .;
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RW_DATA(L1_CACHE_BYTES, PAGE_SIZE, THREAD_ALIGN)
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.sdata : {
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__global_pointer$ = . + 0x800;
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*(.sdata*)
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}
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.rela.dyn : ALIGN(8) {
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__rela_dyn_start = .;
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*(.rela .rela*)
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__rela_dyn_end = .;
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}
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#ifdef CONFIG_RELOCATABLE
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.data.rel : { *(.data.rel*) }
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.got : { *(.got*) }
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.plt : { *(.plt) }
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.dynamic : { *(.dynamic) }
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.dynsym : { *(.dynsym) }
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.dynstr : { *(.dynstr) }
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.hash : { *(.hash) }
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.gnu.hash : { *(.gnu.hash) }
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#endif
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#ifdef CONFIG_EFI
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.pecoff_edata_padding : { BYTE(0); . = ALIGN(PECOFF_FILE_ALIGNMENT); }
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__pecoff_data_raw_size = ABSOLUTE(. - __pecoff_text_end);
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__pecoff_data_raw_end = ABSOLUTE(.);
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#endif
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/* End of data section */
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_edata = .;
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BSS_SECTION(PAGE_SIZE, PAGE_SIZE, 0)
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#ifdef CONFIG_EFI
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. = ALIGN(PECOFF_SECTION_ALIGNMENT);
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__pecoff_data_virt_size = ABSOLUTE(. - __pecoff_text_end);
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__pecoff_data_virt_end = ABSOLUTE(.);
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#endif
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_end = .;
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STABS_DEBUG
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DWARF_DEBUG
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ELF_DETAILS
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.riscv.attributes 0 : { *(.riscv.attributes) }
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DISCARDS
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}
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#endif /* CONFIG_XIP_KERNEL */
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