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Diffstat (limited to 'arch/arm64/kernel/efi-header.S')
| -rw-r--r-- | arch/arm64/kernel/efi-header.S | 152 |
1 files changed, 152 insertions, 0 deletions
diff --git a/arch/arm64/kernel/efi-header.S b/arch/arm64/kernel/efi-header.S new file mode 100644 index 000000000..a71844fb9 --- /dev/null +++ b/arch/arm64/kernel/efi-header.S @@ -0,0 +1,152 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Copyright (C) 2013 - 2017 Linaro, Ltd. + * Copyright (C) 2013, 2014 Red Hat, Inc. + */ + +#include <linux/pe.h> +#include <linux/sizes.h> + + .macro __EFI_PE_HEADER + .long PE_MAGIC +coff_header: + .short IMAGE_FILE_MACHINE_ARM64 // Machine + .short section_count // NumberOfSections + .long 0 // TimeDateStamp + .long 0 // PointerToSymbolTable + .long 0 // NumberOfSymbols + .short section_table - optional_header // SizeOfOptionalHeader + .short IMAGE_FILE_DEBUG_STRIPPED | \ + IMAGE_FILE_EXECUTABLE_IMAGE | \ + IMAGE_FILE_LINE_NUMS_STRIPPED // Characteristics + +optional_header: + .short PE_OPT_MAGIC_PE32PLUS // PE32+ format + .byte 0x02 // MajorLinkerVersion + .byte 0x14 // MinorLinkerVersion + .long __initdata_begin - efi_header_end // SizeOfCode + .long __pecoff_data_size // SizeOfInitializedData + .long 0 // SizeOfUninitializedData + .long __efistub_efi_pe_entry - _head // AddressOfEntryPoint + .long efi_header_end - _head // BaseOfCode + +extra_header_fields: + .quad 0 // ImageBase + .long SEGMENT_ALIGN // SectionAlignment + .long PECOFF_FILE_ALIGNMENT // FileAlignment + .short 0 // MajorOperatingSystemVersion + .short 0 // MinorOperatingSystemVersion + .short LINUX_EFISTUB_MAJOR_VERSION // MajorImageVersion + .short LINUX_EFISTUB_MINOR_VERSION // MinorImageVersion + .short 0 // MajorSubsystemVersion + .short 0 // MinorSubsystemVersion + .long 0 // Win32VersionValue + + .long _end - _head // SizeOfImage + + // Everything before the kernel image is considered part of the header + .long efi_header_end - _head // SizeOfHeaders + .long 0 // CheckSum + .short IMAGE_SUBSYSTEM_EFI_APPLICATION // Subsystem + .short 0 // DllCharacteristics + .quad 0 // SizeOfStackReserve + .quad 0 // SizeOfStackCommit + .quad 0 // SizeOfHeapReserve + .quad 0 // SizeOfHeapCommit + .long 0 // LoaderFlags + .long (section_table - .) / 8 // NumberOfRvaAndSizes + + .quad 0 // ExportTable + .quad 0 // ImportTable + .quad 0 // ResourceTable + .quad 0 // ExceptionTable + .quad 0 // CertificationTable + .quad 0 // BaseRelocationTable + +#ifdef CONFIG_DEBUG_EFI + .long efi_debug_table - _head // DebugTable + .long efi_debug_table_size +#endif + + // Section table +section_table: + .ascii ".text\0\0\0" + .long __initdata_begin - efi_header_end // VirtualSize + .long efi_header_end - _head // VirtualAddress + .long __initdata_begin - efi_header_end // SizeOfRawData + .long efi_header_end - _head // PointerToRawData + + .long 0 // PointerToRelocations + .long 0 // PointerToLineNumbers + .short 0 // NumberOfRelocations + .short 0 // NumberOfLineNumbers + .long IMAGE_SCN_CNT_CODE | \ + IMAGE_SCN_MEM_READ | \ + IMAGE_SCN_MEM_EXECUTE // Characteristics + + .ascii ".data\0\0\0" + .long __pecoff_data_size // VirtualSize + .long __initdata_begin - _head // VirtualAddress + .long __pecoff_data_rawsize // SizeOfRawData + .long __initdata_begin - _head // PointerToRawData + + .long 0 // PointerToRelocations + .long 0 // PointerToLineNumbers + .short 0 // NumberOfRelocations + .short 0 // NumberOfLineNumbers + .long IMAGE_SCN_CNT_INITIALIZED_DATA | \ + IMAGE_SCN_MEM_READ | \ + IMAGE_SCN_MEM_WRITE // Characteristics + + .set section_count, (. - section_table) / 40 + +#ifdef CONFIG_DEBUG_EFI + /* + * The debug table is referenced via its Relative Virtual Address (RVA), + * which is only defined for those parts of the image that are covered + * by a section declaration. Since this header is not covered by any + * section, the debug table must be emitted elsewhere. So stick it in + * the .init.rodata section instead. + * + * Note that the EFI debug entry itself may legally have a zero RVA, + * which means we can simply put it right after the section headers. + */ + __INITRODATA + + .align 2 +efi_debug_table: + // EFI_IMAGE_DEBUG_DIRECTORY_ENTRY + .long 0 // Characteristics + .long 0 // TimeDateStamp + .short 0 // MajorVersion + .short 0 // MinorVersion + .long IMAGE_DEBUG_TYPE_CODEVIEW // Type + .long efi_debug_entry_size // SizeOfData + .long 0 // RVA + .long efi_debug_entry - _head // FileOffset + + .set efi_debug_table_size, . - efi_debug_table + .previous + +efi_debug_entry: + // EFI_IMAGE_DEBUG_CODEVIEW_NB10_ENTRY + .ascii "NB10" // Signature + .long 0 // Unknown + .long 0 // Unknown2 + .long 0 // Unknown3 + + .asciz VMLINUX_PATH + + .set efi_debug_entry_size, . - efi_debug_entry +#endif + + /* + * EFI will load .text onwards at the 4k section alignment + * described in the PE/COFF header. To ensure that instruction + * sequences using an adrp and a :lo12: immediate will function + * correctly at this alignment, we must ensure that .text is + * placed at a 4k boundary in the Image to begin with. + */ + .balign SEGMENT_ALIGN +efi_header_end: + .endm |