389 lines
9.1 KiB
ArmAsm
389 lines
9.1 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* ld script to make ARM Linux kernel
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* taken from the i386 version by Russell King
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* Written by Martin Mares <mj@atrey.karlin.mff.cuni.cz>
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*/
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#include <asm/hyp_image.h>
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#ifdef CONFIG_KVM
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#define HYPERVISOR_EXTABLE \
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. = ALIGN(SZ_8); \
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__start___kvm_ex_table = .; \
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*(__kvm_ex_table) \
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__stop___kvm_ex_table = .;
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#define HYPERVISOR_DATA_SECTIONS \
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HYP_SECTION_NAME(.rodata) : { \
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. = ALIGN(PAGE_SIZE); \
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__hyp_rodata_start = .; \
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*(HYP_SECTION_NAME(.data..ro_after_init)) \
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*(HYP_SECTION_NAME(.rodata)) \
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. = ALIGN(PAGE_SIZE); \
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__hyp_rodata_end = .; \
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}
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#define HYPERVISOR_PERCPU_SECTION \
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. = ALIGN(PAGE_SIZE); \
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HYP_SECTION_NAME(.data..percpu) : { \
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*(HYP_SECTION_NAME(.data..percpu)) \
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}
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#define HYPERVISOR_RELOC_SECTION \
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.hyp.reloc : ALIGN(4) { \
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__hyp_reloc_begin = .; \
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*(.hyp.reloc) \
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__hyp_reloc_end = .; \
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}
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#define BSS_FIRST_SECTIONS \
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__hyp_bss_start = .; \
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*(HYP_SECTION_NAME(.bss)) \
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. = ALIGN(PAGE_SIZE); \
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__hyp_bss_end = .;
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/*
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* We require that __hyp_bss_start and __bss_start are aligned, and enforce it
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* with an assertion. But the BSS_SECTION macro places an empty .sbss section
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* between them, which can in some cases cause the linker to misalign them. To
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* work around the issue, force a page alignment for __bss_start.
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*/
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#define SBSS_ALIGN PAGE_SIZE
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#else /* CONFIG_KVM */
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#define HYPERVISOR_EXTABLE
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#define HYPERVISOR_DATA_SECTIONS
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#define HYPERVISOR_PERCPU_SECTION
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#define HYPERVISOR_RELOC_SECTION
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#define SBSS_ALIGN 0
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#endif
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#define RO_EXCEPTION_TABLE_ALIGN 4
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#define RUNTIME_DISCARD_EXIT
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#include <asm-generic/vmlinux.lds.h>
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#include <asm/cache.h>
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#include <asm/kernel-pgtable.h>
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#include <asm/kexec.h>
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#include <asm/memory.h>
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#include <asm/page.h>
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#include "image.h"
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OUTPUT_ARCH(aarch64)
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ENTRY(_text)
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jiffies = jiffies_64;
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#define HYPERVISOR_TEXT \
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. = ALIGN(PAGE_SIZE); \
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__hyp_idmap_text_start = .; \
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*(.hyp.idmap.text) \
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__hyp_idmap_text_end = .; \
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__hyp_text_start = .; \
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*(.hyp.text) \
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HYPERVISOR_EXTABLE \
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. = ALIGN(PAGE_SIZE); \
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__hyp_text_end = .;
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#define IDMAP_TEXT \
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. = ALIGN(SZ_4K); \
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__idmap_text_start = .; \
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*(.idmap.text) \
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__idmap_text_end = .;
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#ifdef CONFIG_HIBERNATION
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#define HIBERNATE_TEXT \
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ALIGN_FUNCTION(); \
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__hibernate_exit_text_start = .; \
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*(.hibernate_exit.text) \
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__hibernate_exit_text_end = .;
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#else
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#define HIBERNATE_TEXT
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#endif
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#ifdef CONFIG_KEXEC_CORE
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#define KEXEC_TEXT \
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ALIGN_FUNCTION(); \
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__relocate_new_kernel_start = .; \
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*(.kexec_relocate.text) \
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__relocate_new_kernel_end = .;
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#else
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#define KEXEC_TEXT
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#endif
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#ifdef CONFIG_UNMAP_KERNEL_AT_EL0
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#define TRAMP_TEXT \
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. = ALIGN(PAGE_SIZE); \
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__entry_tramp_text_start = .; \
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*(.entry.tramp.text) \
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. = ALIGN(PAGE_SIZE); \
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__entry_tramp_text_end = .; \
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*(.entry.tramp.rodata)
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#else
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#define TRAMP_TEXT
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#endif
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#ifdef CONFIG_UNWIND_TABLES
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#define UNWIND_DATA_SECTIONS \
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.eh_frame : { \
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__eh_frame_start = .; \
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*(.eh_frame) \
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__eh_frame_end = .; \
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}
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#else
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#define UNWIND_DATA_SECTIONS
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#endif
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/*
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* The size of the PE/COFF section that covers the kernel image, which
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* runs from _stext to _edata, must be a round multiple of the PE/COFF
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* FileAlignment, which we set to its minimum value of 0x200. '_stext'
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* itself is 4 KB aligned, so padding out _edata to a 0x200 aligned
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* boundary should be sufficient.
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*/
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PECOFF_FILE_ALIGNMENT = 0x200;
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#ifdef CONFIG_EFI
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#define PECOFF_EDATA_PADDING \
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.pecoff_edata_padding : { BYTE(0); . = ALIGN(PECOFF_FILE_ALIGNMENT); }
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#else
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#define PECOFF_EDATA_PADDING
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#endif
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SECTIONS
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{
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/*
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* XXX: The linker does not define how output sections are
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* assigned to input sections when there are multiple statements
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* matching the same input section name. There is no documented
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* order of matching.
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*/
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DISCARDS
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/DISCARD/ : {
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*(.interp .dynamic)
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*(.dynsym .dynstr .hash .gnu.hash)
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}
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. = KIMAGE_VADDR;
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.head.text : {
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_text = .;
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HEAD_TEXT
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}
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.text : ALIGN(SEGMENT_ALIGN) { /* Real text segment */
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_stext = .; /* Text and read-only data */
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IRQENTRY_TEXT
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SOFTIRQENTRY_TEXT
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ENTRY_TEXT
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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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HYPERVISOR_TEXT
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*(.gnu.warning)
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}
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. = ALIGN(SEGMENT_ALIGN);
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_etext = .; /* End of text section */
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/* everything from this point to __init_begin will be marked RO NX */
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RO_DATA(PAGE_SIZE)
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HYPERVISOR_DATA_SECTIONS
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.got : { *(.got) }
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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 : { *(.got.plt) }
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ASSERT(SIZEOF(.got.plt) == 0 || SIZEOF(.got.plt) == 0x18,
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"Unexpected GOT/PLT entries detected!")
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/* code sections that are never executed via the kernel mapping */
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.rodata.text : {
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TRAMP_TEXT
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HIBERNATE_TEXT
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KEXEC_TEXT
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IDMAP_TEXT
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. = ALIGN(PAGE_SIZE);
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}
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idmap_pg_dir = .;
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. += PAGE_SIZE;
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#ifdef CONFIG_UNMAP_KERNEL_AT_EL0
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tramp_pg_dir = .;
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. += PAGE_SIZE;
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#endif
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reserved_pg_dir = .;
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. += PAGE_SIZE;
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swapper_pg_dir = .;
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. += PAGE_SIZE;
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. = ALIGN(SEGMENT_ALIGN);
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__init_begin = .;
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__inittext_begin = .;
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INIT_TEXT_SECTION(8)
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__exittext_begin = .;
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.exit.text : {
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EXIT_TEXT
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}
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__exittext_end = .;
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. = ALIGN(4);
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.altinstructions : {
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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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UNWIND_DATA_SECTIONS
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. = ALIGN(SEGMENT_ALIGN);
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__inittext_end = .;
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__initdata_begin = .;
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init_idmap_pg_dir = .;
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. += INIT_IDMAP_DIR_SIZE;
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init_idmap_pg_end = .;
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.init.data : {
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INIT_DATA
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INIT_SETUP(16)
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INIT_CALLS
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CON_INITCALL
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INIT_RAM_FS
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*(.init.altinstructions .init.bss) /* from the EFI stub */
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}
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.exit.data : {
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EXIT_DATA
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}
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PERCPU_SECTION(L1_CACHE_BYTES)
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HYPERVISOR_PERCPU_SECTION
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HYPERVISOR_RELOC_SECTION
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.rela.dyn : ALIGN(8) {
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__rela_start = .;
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*(.rela .rela*)
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__rela_end = .;
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}
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.relr.dyn : ALIGN(8) {
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__relr_start = .;
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*(.relr.dyn)
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__relr_end = .;
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}
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. = ALIGN(SEGMENT_ALIGN);
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__initdata_end = .;
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__init_end = .;
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_data = .;
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_sdata = .;
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RW_DATA(L1_CACHE_BYTES, PAGE_SIZE, THREAD_ALIGN)
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/*
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* Data written with the MMU off but read with the MMU on requires
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* cache lines to be invalidated, discarding up to a Cache Writeback
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* Granule (CWG) of data from the cache. Keep the section that
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* requires this type of maintenance to be in its own Cache Writeback
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* Granule (CWG) area so the cache maintenance operations don't
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* interfere with adjacent data.
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*/
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.mmuoff.data.write : ALIGN(SZ_2K) {
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__mmuoff_data_start = .;
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*(.mmuoff.data.write)
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}
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. = ALIGN(SZ_2K);
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.mmuoff.data.read : {
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*(.mmuoff.data.read)
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__mmuoff_data_end = .;
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}
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PECOFF_EDATA_PADDING
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__pecoff_data_rawsize = ABSOLUTE(. - __initdata_begin);
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_edata = .;
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BSS_SECTION(SBSS_ALIGN, 0, 0)
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. = ALIGN(PAGE_SIZE);
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init_pg_dir = .;
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. += INIT_DIR_SIZE;
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init_pg_end = .;
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. = ALIGN(SEGMENT_ALIGN);
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__pecoff_data_size = ABSOLUTE(. - __initdata_begin);
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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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HEAD_SYMBOLS
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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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.plt : {
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*(.plt) *(.plt.*) *(.iplt) *(.igot .igot.plt)
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}
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ASSERT(SIZEOF(.plt) == 0, "Unexpected run-time procedure linkages detected!")
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.data.rel.ro : { *(.data.rel.ro) }
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ASSERT(SIZEOF(.data.rel.ro) == 0, "Unexpected RELRO detected!")
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}
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#include "image-vars.h"
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/*
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* The HYP init code and ID map text can't be longer than a page each. The
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* former is page-aligned, but the latter may not be with 16K or 64K pages, so
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* it should also not cross a page boundary.
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*/
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ASSERT(__hyp_idmap_text_end - __hyp_idmap_text_start <= PAGE_SIZE,
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"HYP init code too big")
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ASSERT(__idmap_text_end - (__idmap_text_start & ~(SZ_4K - 1)) <= SZ_4K,
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"ID map text too big or misaligned")
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#ifdef CONFIG_HIBERNATION
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ASSERT(__hibernate_exit_text_end - __hibernate_exit_text_start <= SZ_4K,
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"Hibernate exit text is bigger than 4 KiB")
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ASSERT(__hibernate_exit_text_start == swsusp_arch_suspend_exit,
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"Hibernate exit text does not start with swsusp_arch_suspend_exit")
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#endif
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#ifdef CONFIG_UNMAP_KERNEL_AT_EL0
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ASSERT((__entry_tramp_text_end - __entry_tramp_text_start) <= 3*PAGE_SIZE,
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"Entry trampoline text too big")
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#endif
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#ifdef CONFIG_KVM
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ASSERT(__hyp_bss_start == __bss_start, "HYP and Host BSS are misaligned")
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#endif
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/*
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* If padding is applied before .head.text, virt<->phys conversions will fail.
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*/
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ASSERT(_text == KIMAGE_VADDR, "HEAD is misaligned")
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ASSERT(swapper_pg_dir - reserved_pg_dir == RESERVED_SWAPPER_OFFSET,
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"RESERVED_SWAPPER_OFFSET is wrong!")
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#ifdef CONFIG_UNMAP_KERNEL_AT_EL0
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ASSERT(swapper_pg_dir - tramp_pg_dir == TRAMP_SWAPPER_OFFSET,
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"TRAMP_SWAPPER_OFFSET is wrong!")
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#endif
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#ifdef CONFIG_KEXEC_CORE
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/* kexec relocation code should fit into one KEXEC_CONTROL_PAGE_SIZE */
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ASSERT(__relocate_new_kernel_end - __relocate_new_kernel_start <= SZ_4K,
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"kexec relocation code is bigger than 4 KiB")
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ASSERT(KEXEC_CONTROL_PAGE_SIZE >= SZ_4K, "KEXEC_CONTROL_PAGE_SIZE is broken")
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ASSERT(__relocate_new_kernel_start == arm64_relocate_new_kernel,
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"kexec control page does not start with arm64_relocate_new_kernel")
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#endif
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