diff options
Diffstat (limited to 'arch/arm64/kernel/efi-header.S')
| -rw-r--r-- | arch/arm64/kernel/efi-header.S | 155 |
1 files changed, 92 insertions, 63 deletions
diff --git a/arch/arm64/kernel/efi-header.S b/arch/arm64/kernel/efi-header.S index a7cfacce3e15..11d7f7de202d 100644 --- a/arch/arm64/kernel/efi-header.S +++ b/arch/arm64/kernel/efi-header.S @@ -7,54 +7,72 @@ #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 -coff_header: .short IMAGE_FILE_MACHINE_ARM64 // Machine - .short section_count // NumberOfSections + .short .Lsection_count // NumberOfSections .long 0 // TimeDateStamp .long 0 // PointerToSymbolTable .long 0 // NumberOfSymbols - .short section_table - optional_header // SizeOfOptionalHeader + .short .Lsection_table - .Loptional_header // SizeOfOptionalHeader .short IMAGE_FILE_DEBUG_STRIPPED | \ IMAGE_FILE_EXECUTABLE_IMAGE | \ IMAGE_FILE_LINE_NUMS_STRIPPED // Characteristics -optional_header: +.Loptional_header: .short PE_OPT_MAGIC_PE32PLUS // PE32+ format .byte 0x02 // MajorLinkerVersion .byte 0x14 // MinorLinkerVersion - .long __initdata_begin - efi_header_end // SizeOfCode + .long __initdata_begin - .Lefi_header_end // SizeOfCode .long __pecoff_data_size // SizeOfInitializedData .long 0 // SizeOfUninitializedData - .long __efistub_entry - _head // AddressOfEntryPoint - .long efi_header_end - _head // BaseOfCode + .long __efistub_efi_pe_entry - .L_head // AddressOfEntryPoint + .long .Lefi_header_end - .L_head // BaseOfCode -extra_header_fields: .quad 0 // ImageBase - .long SZ_4K // SectionAlignment + .long SEGMENT_ALIGN // SectionAlignment .long PECOFF_FILE_ALIGNMENT // FileAlignment .short 0 // MajorOperatingSystemVersion .short 0 // MinorOperatingSystemVersion - .short 0 // MajorImageVersion - .short 0 // MinorImageVersion + .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 + .long _end - .L_head // SizeOfImage // Everything before the kernel image is considered part of the header - .long efi_header_end - _head // SizeOfHeaders + .long .Lefi_header_end - .L_head // SizeOfHeaders .long 0 // CheckSum .short IMAGE_SUBSYSTEM_EFI_APPLICATION // Subsystem - .short 0 // DllCharacteristics + .short IMAGE_DLL_CHARACTERISTICS_NX_COMPAT // DllCharacteristics .quad 0 // SizeOfStackReserve .quad 0 // SizeOfStackCommit .quad 0 // SizeOfHeapReserve .quad 0 // SizeOfHeapCommit .long 0 // LoaderFlags - .long (section_table - .) / 8 // NumberOfRvaAndSizes + .long (.Lsection_table - .) / 8 // NumberOfRvaAndSizes .quad 0 // ExportTable .quad 0 // ImportTable @@ -63,18 +81,56 @@ extra_header_fields: .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 - .long efi_debug_table - _head // DebugTable - .long efi_debug_table_size + // 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 -section_table: +.Lsection_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 __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 @@ -86,9 +142,9 @@ section_table: .ascii ".data\0\0\0" .long __pecoff_data_size // VirtualSize - .long __initdata_begin - _head // VirtualAddress + .long __initdata_begin - .L_head // VirtualAddress .long __pecoff_data_rawsize // SizeOfRawData - .long __initdata_begin - _head // PointerToRawData + .long __initdata_begin - .L_head // PointerToRawData .long 0 // PointerToRelocations .long 0 // PointerToLineNumbers @@ -98,37 +154,10 @@ section_table: IMAGE_SCN_MEM_READ | \ IMAGE_SCN_MEM_WRITE // Characteristics - .set section_count, (. - section_table) / 40 + .set .Lsection_count, (. - .Lsection_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: +.Lefi_debug_entry: // EFI_IMAGE_DEBUG_CODEVIEW_NB10_ENTRY .ascii "NB10" // Signature .long 0 // Unknown @@ -137,16 +166,16 @@ efi_debug_entry: .asciz VMLINUX_PATH - .set efi_debug_entry_size, . - efi_debug_entry + .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 - /* - * 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. - */ - .align 12 -efi_header_end: + .balign SEGMENT_ALIGN +.Lefi_header_end: +#else + .set .Lpe_header_offset, 0x0 +#endif .endm |