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- /*
- * crt0-efi-aarch64.S - PE/COFF header for AArch64 EFI applications
- *
- * Copright (C) 2014 Linaro Ltd. <[email protected]>
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice and this list of conditions, without modification.
- * 2. The name of the author may not be used to endorse or promote products
- * derived from this software without specific prior written permission.
- *
- * Alternatively, this software may be distributed under the terms of the
- * GNU General Public License as published by the Free Software Foundation;
- * 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 2 // 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 _edata - _start // SizeOfCode
- .long 0 // SizeOfInitializedData
- .long 0 // SizeOfUninitializedData
- .long _start - ImageBase // AddressOfEntryPoint
- .long _start - ImageBase // BaseOfCode
- extra_header_fields:
- .quad 0 // ImageBase
- .long 0x20 // SectionAlignment
- .long 0x8 // FileAlignment
- .short 0 // MajorOperatingSystemVersion
- .short 0 // MinorOperatingSystemVersion
- .short 0 // MajorImageVersion
- .short 0 // MinorImageVersion
- .short 0 // MajorSubsystemVersion
- .short 0 // MinorSubsystemVersion
- .long 0 // Win32VersionValue
- .long _edata - 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:
- /*
- * The EFI application loader requires a relocation section
- * because EFI applications must be relocatable. This is a
- * dummy section as far as we are concerned.
- */
- .ascii ".reloc"
- .byte 0
- .byte 0 // end of 0 padding of section name
- .long 0
- .long 0
- .long 0 // SizeOfRawData
- .long 0 // PointerToRawData
- .long 0 // PointerToRelocations
- .long 0 // PointerToLineNumbers
- .short 0 // NumberOfRelocations
- .short 0 // NumberOfLineNumbers
- .long 0x42100040 // Characteristics (section flags)
- .ascii ".text"
- .byte 0
- .byte 0
- .byte 0 // end of 0 padding of section name
- .long _edata - _start // VirtualSize
- .long _start - ImageBase // VirtualAddress
- .long _edata - _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)
- .long 0xe0500020 // Characteristics (section flags)
- _start:
- stp x29, x30, [sp, #-32]!
- mov x29, sp
- stp x0, x1, [sp, #16]
- mov x2, x0
- mov x3, x1
- adr x0, ImageBase
- adrp x1, _DYNAMIC
- add x1, x1, #:lo12:_DYNAMIC
- bl _relocate
- cbnz x0, 0f
- ldp x0, x1, [sp, #16]
- bl efi_main
- 0: ldp x29, x30, [sp], #32
- ret
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