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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/arm/boot/compressed/efi-header.S
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/* SPDX-License-Identifier: GPL-2.0-only */

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/*

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 * Copyright (C) 2013-2017 Linaro Ltd

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 * Authors: Roy Franz <[email protected]>

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 *          Ard Biesheuvel <[email protected]>

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 */

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#include <linux/pe.h>

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#include <linux/sizes.h>

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		.macro	__nop

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 AR_CLASS(	mov	r0, r0		)

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  M_CLASS(	nop.w			)

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		.endm

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		.macro __initial_nops

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#ifdef CONFIG_EFI_STUB

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		@ This is a two-instruction NOP, which happens to bear the

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		@ PE/COFF signature "MZ" in the first two bytes, so the kernel

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		@ is accepted as an EFI binary. Booting via the UEFI stub

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		@ will not execute those instructions, but the ARM/Linux

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		@ boot protocol does, so we need some NOPs here.

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		.inst	IMAGE_DOS_SIGNATURE | (0xe225 << 16) @ eor r5, r5, 0x4d000

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		eor	r5, r5, 0x4d000			@ undo previous insn

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#else

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		__nop

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		__nop

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#endif

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		.endm

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		.macro	__EFI_HEADER

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#ifdef CONFIG_EFI_STUB

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		.set	start_offset, __efi_start - start

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		.org	start + 0x3c

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		@

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		@ The PE header can be anywhere in the file, but for

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		@ simplicity we keep it together with the MSDOS header

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		@ The offset to the PE/COFF header needs to be at offset

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		@ 0x3C in the MSDOS header.

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		@ The only 2 fields of the MSDOS header that are used are this

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		@ PE/COFF offset, and the "MZ" bytes at offset 0x0.

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		@

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		.long	pe_header - start		@ Offset to the PE header.

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pe_header:

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		.long	IMAGE_NT_SIGNATURE

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coff_header:

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		.short	IMAGE_FILE_MACHINE_THUMB	@ Machine

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		.short	section_count			@ NumberOfSections

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		.long	0 				@ TimeDateStamp

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		.long	0				@ PointerToSymbolTable

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		.long	0				@ NumberOfSymbols

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		.short	section_table - optional_header	@ SizeOfOptionalHeader

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		.short	IMAGE_FILE_32BIT_MACHINE | \

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			IMAGE_FILE_DEBUG_STRIPPED | \

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			IMAGE_FILE_EXECUTABLE_IMAGE | \

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			IMAGE_FILE_LINE_NUMS_STRIPPED	@ Characteristics

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#define __pecoff_code_size (__pecoff_data_start - __efi_start)

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optional_header:

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		.short	IMAGE_NT_OPTIONAL_HDR32_MAGIC	@ PE32 format

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		.byte	0x02				@ MajorLinkerVersion

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		.byte	0x14				@ MinorLinkerVersion

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		.long	__pecoff_code_size		@ SizeOfCode

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		.long	__pecoff_data_size		@ SizeOfInitializedData

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		.long	0				@ SizeOfUninitializedData

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		.long	efi_pe_entry - start		@ AddressOfEntryPoint

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		.long	start_offset			@ BaseOfCode

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		.long	__pecoff_data_start - start	@ BaseOfData

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extra_header_fields:

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		.long	0				@ ImageBase

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		.long	SZ_4K				@ SectionAlignment

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		.long	SZ_512				@ FileAlignment

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		.short	0				@ MajorOsVersion

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		.short	0				@ MinorOsVersion

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		.short	LINUX_EFISTUB_MAJOR_VERSION	@ MajorImageVersion

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		.short	LINUX_EFISTUB_MINOR_VERSION	@ MinorImageVersion

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		.short	0				@ MajorSubsystemVersion

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		.short	0				@ MinorSubsystemVersion

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		.long	0				@ Win32VersionValue

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		.long	__pecoff_end - start		@ SizeOfImage

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		.long	start_offset			@ SizeOfHeaders

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		.long	0				@ CheckSum

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		.short	IMAGE_SUBSYSTEM_EFI_APPLICATION	@ Subsystem

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		.short	0				@ DllCharacteristics

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		.long	0				@ SizeOfStackReserve

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		.long	0				@ SizeOfStackCommit

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		.long	0				@ SizeOfHeapReserve

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		.long	0				@ SizeOfHeapCommit

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		.long	0				@ LoaderFlags

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		.long	(section_table - .) / 8		@ NumberOfRvaAndSizes

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		.quad	0				@ ExportTable

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		.quad	0				@ ImportTable

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		.quad	0				@ ResourceTable

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		.quad	0				@ ExceptionTable

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		.quad	0				@ CertificationTable

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		.quad	0				@ BaseRelocationTable

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section_table:

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		.ascii	".text\0\0\0"

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		.long	__pecoff_code_size		@ VirtualSize

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		.long	__efi_start			@ VirtualAddress

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		.long	__pecoff_code_size		@ SizeOfRawData

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		.long	__efi_start			@ PointerToRawData

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		.long	0				@ PointerToRelocations

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		.long	0				@ PointerToLineNumbers

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		.short	0				@ NumberOfRelocations

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		.short	0				@ NumberOfLineNumbers

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		.long	IMAGE_SCN_CNT_CODE | \

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			IMAGE_SCN_MEM_READ | \

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			IMAGE_SCN_MEM_EXECUTE		@ Characteristics

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		.ascii	".data\0\0\0"

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		.long	__pecoff_data_size		@ VirtualSize

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		.long	__pecoff_data_start - start	@ VirtualAddress

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		.long	__pecoff_data_rawsize		@ SizeOfRawData

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		.long	__pecoff_data_start - start	@ PointerToRawData

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		.long	0				@ PointerToRelocations

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		.long	0				@ PointerToLineNumbers

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		.short	0				@ NumberOfRelocations

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		.short	0				@ NumberOfLineNumbers

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		.long	IMAGE_SCN_CNT_INITIALIZED_DATA | \

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			IMAGE_SCN_MEM_READ | \

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			IMAGE_SCN_MEM_WRITE		@ Characteristics

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		.set	section_count, (. - section_table) / 40

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		.align	12

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__efi_start:

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#endif

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		.endm

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