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338 lines
7.6 KiB
338 lines
7.6 KiB
/* 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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#define RO_EXCEPTION_TABLE_ALIGN 8 |
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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/hyp_image.h> |
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#include <asm/kernel-pgtable.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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#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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__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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__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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#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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#endif |
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#define HYPERVISOR_TEXT \ |
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/* \ |
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* Align to 4 KB so that \ |
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* a) the HYP vector table is at its minimum \ |
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* alignment of 2048 bytes \ |
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* b) the HYP init code will not cross a page \ |
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* boundary if its size does not exceed \ |
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* 4 KB (see related ASSERT() below) \ |
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*/ \ |
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. = ALIGN(SZ_4K); \ |
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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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__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(SZ_4K); \ |
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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_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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#else |
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#define TRAMP_TEXT |
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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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CPUIDLE_TEXT |
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LOCK_TEXT |
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KPROBES_TEXT |
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HYPERVISOR_TEXT |
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IDMAP_TEXT |
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HIBERNATE_TEXT |
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TRAMP_TEXT |
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*(.fixup) |
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*(.gnu.warning) |
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. = ALIGN(16); |
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*(.got) /* Global offset table */ |
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} |
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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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. = 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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idmap_pg_dir = .; |
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. += IDMAP_DIR_SIZE; |
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idmap_pg_end = .; |
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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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. = ALIGN(SEGMENT_ALIGN); |
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__inittext_end = .; |
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__initdata_begin = .; |
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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 .rela*) |
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} |
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__rela_offset = ABSOLUTE(ADDR(.rela.dyn) - KIMAGE_VADDR); |
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__rela_size = SIZEOF(.rela.dyn); |
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#ifdef CONFIG_RELR |
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.relr.dyn : ALIGN(8) { |
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*(.relr.dyn) |
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} |
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__relr_offset = ABSOLUTE(ADDR(.relr.dyn) - KIMAGE_VADDR); |
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__relr_size = SIZEOF(.relr.dyn); |
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#endif |
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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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HYPERVISOR_DATA_SECTIONS |
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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(0, 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, |
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* and should not cross a page boundary. |
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*/ |
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ASSERT(__hyp_idmap_text_end - (__hyp_idmap_text_start & ~(SZ_4K - 1)) <= SZ_4K, |
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"HYP init code too big or misaligned") |
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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 - 1)) |
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<= SZ_4K, "Hibernate exit text too big or misaligned") |
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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) == PAGE_SIZE, |
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"Entry trampoline text too big") |
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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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