diff options
Diffstat (limited to 'gnu-efi/gnuefi/crt0-efi-aarch64.S')
| -rw-r--r-- | gnu-efi/gnuefi/crt0-efi-aarch64.S | 143 |
1 files changed, 15 insertions, 128 deletions
diff --git a/gnu-efi/gnuefi/crt0-efi-aarch64.S b/gnu-efi/gnuefi/crt0-efi-aarch64.S index a96b5eb8..0fefec0c 100644 --- a/gnu-efi/gnuefi/crt0-efi-aarch64.S +++ b/gnu-efi/gnuefi/crt0-efi-aarch64.S @@ -16,136 +16,11 @@ * either version 2 of the License, or (at your option) any later version. */ - .section .text.head - - /* - * Magic "MZ" signature for PE/COFF - */ - .globl ImageBase -ImageBase: - .ascii "MZ" - .skip 58 // 'MZ' + pad + offset == 64 - .long pe_header - ImageBase // Offset to the PE header. -pe_header: - .ascii "PE" - .short 0 -coff_header: - .short 0xaa64 // AArch64 - .short 4 // nr_sections - .long 0 // TimeDateStamp - .long 0 // PointerToSymbolTable - .long 1 // NumberOfSymbols - .short section_table - optional_header // SizeOfOptionalHeader - .short 0x206 // Characteristics. - // IMAGE_FILE_DEBUG_STRIPPED | - // IMAGE_FILE_EXECUTABLE_IMAGE | - // IMAGE_FILE_LINE_NUMS_STRIPPED -optional_header: - .short 0x20b // PE32+ format - .byte 0x02 // MajorLinkerVersion - .byte 0x14 // MinorLinkerVersion - .long _text_size // SizeOfCode - .long _alldata_size // SizeOfInitializedData - .long 0 // SizeOfUninitializedData - .long _start - ImageBase // AddressOfEntryPoint - .long _start - ImageBase // BaseOfCode - -extra_header_fields: - .quad 0 // ImageBase - .long 0x1000 // SectionAlignment - .long 0x200 // FileAlignment - .short 0 // MajorOperatingSystemVersion - .short 0 // MinorOperatingSystemVersion - .short 0 // MajorImageVersion - .short 0 // MinorImageVersion - .short 0 // MajorSubsystemVersion - .short 0 // MinorSubsystemVersion - .long 0 // Win32VersionValue - - .long _erodata - ImageBase // SizeOfImage - - // Everything before the kernel image is considered part of the header - .long _start - ImageBase // SizeOfHeaders - .long 0 // CheckSum - .short EFI_SUBSYSTEM // Subsystem - .short 0 // DllCharacteristics - .quad 0 // SizeOfStackReserve - .quad 0 // SizeOfStackCommit - .quad 0 // SizeOfHeapReserve - .quad 0 // SizeOfHeapCommit - .long 0 // LoaderFlags - .long 0x6 // NumberOfRvaAndSizes - - .quad 0 // ExportTable - .quad 0 // ImportTable - .quad 0 // ResourceTable - .quad 0 // ExceptionTable - .quad 0 // CertificationTable - .quad 0 // BaseRelocationTable - - // Section table -section_table: - .ascii ".text\0\0\0" - .long _evtext - _start // VirtualSize - .long _start - ImageBase // VirtualAddress - .long _etext - _start // SizeOfRawData - .long _start - ImageBase // PointerToRawData - - .long 0 // PointerToRelocations (0 for executables) - .long 0 // PointerToLineNumbers (0 for executables) - .short 0 // NumberOfRelocations (0 for executables) - .short 0 // NumberOfLineNumbers (0 for executables) - /* - * EFI_IMAGE_SCN_MEM_READ | EFI_IMAGE_SCN_MEM_EXECUTE | EFI_IMAGE_SCN_CNT_CODE - */ - .long 0x60000020 // Characteristics (section flags) - - .ascii ".data\0\0\0" - .long _data_vsize // VirtualSize - .long _data - ImageBase // VirtualAddress - .long _data_size // SizeOfRawData - .long _data - ImageBase // PointerToRawData - - .long 0 // PointerToRelocations (0 for executables) - .long 0 // PointerToLineNumbers (0 for executables) - .short 0 // NumberOfRelocations (0 for executables) - .short 0 // NumberOfLineNumbers (0 for executables) - /* - * EFI_IMAGE_SCN_MEM_WRITE | EFI_IMAGE_SCN_MEM_READ | EFI_IMAGE_SCN_CNT_INITIALIZED_DATA - */ - .long 0xc0000040 // Characteristics (section flags) - - .ascii ".sbat\0\0\0" - .long _sbat_vsize // VirtualSize - .long _sbat - ImageBase // VirtualAddress - .long _sbat_size // SizeOfRawData - .long _sbat - ImageBase // PointerToRawData - - .long 0 // PointerToRelocations (0 for executables) - .long 0 // PointerToLineNumbers (0 for executables) - .short 0 // NumberOfRelocations (0 for executables) - .short 0 // NumberOfLineNumbers (0 for executables) - /* - * EFI_IMAGE_SCN_MEM_READ | EFI_IMAGE_SCN_ALIGN_8BYTES | EFI_IMAGE_SCN_CNT_INITIALIZED_DATA - */ - .long 0x40400040 // Characteristics (section flags) - - .ascii ".rodata\0" - .long _rodata_vsize // VirtualSize - .long _rodata - ImageBase // VirtualAddress - .long _rodata_size // SizeOfRawData - .long _rodata - ImageBase // PointerToRawData - - .long 0 // PointerToRelocations (0 for executables) - .long 0 // PointerToLineNumbers (0 for executables) - .short 0 // NumberOfRelocations (0 for executables) - .short 0 // NumberOfLineNumbers (0 for executables) - /* - * EFI_IMAGE_SCN_MEM_READ | EFI_IMAGE_SCN_ALIGN_8BYTES | EFI_IMAGE_SCN_CNT_INITIALIZED_DATA - */ - .long 0x40400040 // Characteristics (section flags) + .text .align 12 + + .globl _start _start: stp x29, x30, [sp, #-32]! mov x29, sp @@ -164,3 +39,15 @@ _start: 0: ldp x29, x30, [sp], #32 ret + + // hand-craft a dummy .reloc section so EFI knows it's a relocatable executable: + .data +.dummy0: +.dummy1: + .4byte 0 + +#define IMAGE_REL_ABSOLUTE 0 + .section .reloc, "a" + .4byte .dummy1-.dummy0 // Page RVA + .4byte 10 // Block Size (2*4+2) + .2byte (IMAGE_REL_ABSOLUTE<<12) + 0 // reloc for dummy |