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-rw-r--r--arch/arm64/kernel/efi-header.S181
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diff --git a/arch/arm64/kernel/efi-header.S b/arch/arm64/kernel/efi-header.S
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+/* 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_signature_nop
+#ifdef CONFIG_EFI
+.L_head:
+ /*
+ * This ccmp instruction has no meaningful effect except that
+ * its opcode forms the magic "MZ" signature required by UEFI.
+ */
+ ccmp x18, #0, #0xd, pl
+#else
+ /*
+ * Bootloaders may inspect the opcode at the start of the kernel
+ * image to decide if the kernel is capable of booting via UEFI.
+ * So put an ordinary NOP here, not the "MZ.." pseudo-nop above.
+ */
+ nop
+#endif
+ .endm
+
+ .macro __EFI_PE_HEADER
+#ifdef CONFIG_EFI
+ .set .Lpe_header_offset, . - .L_head
+ .long PE_MAGIC
+ .short IMAGE_FILE_MACHINE_ARM64 // Machine
+ .short .Lsection_count // NumberOfSections
+ .long 0 // TimeDateStamp
+ .long 0 // PointerToSymbolTable
+ .long 0 // NumberOfSymbols
+ .short .Lsection_table - .Loptional_header // SizeOfOptionalHeader
+ .short IMAGE_FILE_DEBUG_STRIPPED | \
+ IMAGE_FILE_EXECUTABLE_IMAGE | \
+ IMAGE_FILE_LINE_NUMS_STRIPPED // Characteristics
+
+.Loptional_header:
+ .short PE_OPT_MAGIC_PE32PLUS // PE32+ format
+ .byte 0x02 // MajorLinkerVersion
+ .byte 0x14 // MinorLinkerVersion
+ .long __initdata_begin - .Lefi_header_end // SizeOfCode
+ .long __pecoff_data_size // SizeOfInitializedData
+ .long 0 // SizeOfUninitializedData
+ .long __efistub_efi_pe_entry - .L_head // AddressOfEntryPoint
+ .long .Lefi_header_end - .L_head // BaseOfCode
+
+ .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 - .L_head // SizeOfImage
+
+ // Everything before the kernel image is considered part of the header
+ .long .Lefi_header_end - .L_head // SizeOfHeaders
+ .long 0 // CheckSum
+ .short IMAGE_SUBSYSTEM_EFI_APPLICATION // Subsystem
+ .short IMAGE_DLL_CHARACTERISTICS_NX_COMPAT // DllCharacteristics
+ .quad 0 // SizeOfStackReserve
+ .quad 0 // SizeOfStackCommit
+ .quad 0 // SizeOfHeapReserve
+ .quad 0 // SizeOfHeapCommit
+ .long 0 // LoaderFlags
+ .long (.Lsection_table - .) / 8 // NumberOfRvaAndSizes
+
+ .quad 0 // ExportTable
+ .quad 0 // ImportTable
+ .quad 0 // ResourceTable
+ .quad 0 // ExceptionTable
+ .quad 0 // CertificationTable
+ .quad 0 // BaseRelocationTable
+
+#if defined(CONFIG_DEBUG_EFI) || defined(CONFIG_ARM64_BTI_KERNEL)
+ .long .Lefi_debug_table - .L_head // DebugTable
+ .long .Lefi_debug_table_size
+
+ /*
+ * 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 payloads themselves are permitted to have zero RVAs,
+ * which means we can simply put those right after the section headers.
+ */
+ __INITRODATA
+
+ .align 2
+.Lefi_debug_table:
+#ifdef CONFIG_DEBUG_EFI
+ // EFI_IMAGE_DEBUG_DIRECTORY_ENTRY
+ .long 0 // Characteristics
+ .long 0 // TimeDateStamp
+ .short 0 // MajorVersion
+ .short 0 // MinorVersion
+ .long IMAGE_DEBUG_TYPE_CODEVIEW // Type
+ .long .Lefi_debug_entry_size // SizeOfData
+ .long 0 // RVA
+ .long .Lefi_debug_entry - .L_head // FileOffset
+#endif
+#ifdef CONFIG_ARM64_BTI_KERNEL
+ .long 0 // Characteristics
+ .long 0 // TimeDateStamp
+ .short 0 // MajorVersion
+ .short 0 // MinorVersion
+ .long IMAGE_DEBUG_TYPE_EX_DLLCHARACTERISTICS // Type
+ .long 4 // SizeOfData
+ .long 0 // RVA
+ .long .Lefi_dll_characteristics_ex - .L_head // FileOffset
+#endif
+ .set .Lefi_debug_table_size, . - .Lefi_debug_table
+ .previous
+#endif
+
+ // Section table
+.Lsection_table:
+ .ascii ".text\0\0\0"
+ .long __initdata_begin - .Lefi_header_end // VirtualSize
+ .long .Lefi_header_end - .L_head // VirtualAddress
+ .long __initdata_begin - .Lefi_header_end // SizeOfRawData
+ .long .Lefi_header_end - .L_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 - .L_head // VirtualAddress
+ .long __pecoff_data_rawsize // SizeOfRawData
+ .long __initdata_begin - .L_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 .Lsection_count, (. - .Lsection_table) / 40
+
+#ifdef CONFIG_DEBUG_EFI
+.Lefi_debug_entry:
+ // EFI_IMAGE_DEBUG_CODEVIEW_NB10_ENTRY
+ .ascii "NB10" // Signature
+ .long 0 // Unknown
+ .long 0 // Unknown2
+ .long 0 // Unknown3
+
+ .asciz VMLINUX_PATH
+
+ .set .Lefi_debug_entry_size, . - .Lefi_debug_entry
+#endif
+#ifdef CONFIG_ARM64_BTI_KERNEL
+.Lefi_dll_characteristics_ex:
+ .long IMAGE_DLLCHARACTERISTICS_EX_FORWARD_CFI_COMPAT
+#endif
+
+ .balign SEGMENT_ALIGN
+.Lefi_header_end:
+#else
+ .set .Lpe_header_offset, 0x0
+#endif
+ .endm