Curle
d588e232c4
This branch has been dedicated to purely the UEFI bootloader. As such, all other code has been removed. This code can be compiled with Visual Studio, gcc or llvm.
131 lines
3.9 KiB
ArmAsm
131 lines
3.9 KiB
ArmAsm
/*
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* crt0-efi-aarch64.S - PE/COFF header for AArch64 EFI applications
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*
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* Copright (C) 2014 Linaro Ltd. <ard.biesheuvel@linaro.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice and this list of conditions, without modification.
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* 2. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License as published by the Free Software Foundation;
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* either version 2 of the License, or (at your option) any later version.
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*/
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.section .text.head
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/*
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* Magic "MZ" signature for PE/COFF
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*/
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.globl ImageBase
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ImageBase:
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.ascii "MZ"
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.skip 58 // 'MZ' + pad + offset == 64
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.long pe_header - ImageBase // Offset to the PE header.
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pe_header:
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.ascii "PE"
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.short 0
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coff_header:
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.short 0xaa64 // AArch64
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.short 2 // nr_sections
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.long 0 // TimeDateStamp
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.long 0 // PointerToSymbolTable
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.long 1 // NumberOfSymbols
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.short section_table - optional_header // SizeOfOptionalHeader
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.short 0x206 // Characteristics.
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// IMAGE_FILE_DEBUG_STRIPPED |
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// IMAGE_FILE_EXECUTABLE_IMAGE |
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// IMAGE_FILE_LINE_NUMS_STRIPPED
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optional_header:
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.short 0x20b // PE32+ format
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.byte 0x02 // MajorLinkerVersion
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.byte 0x14 // MinorLinkerVersion
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.long _data - _start // SizeOfCode
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.long _data_size // SizeOfInitializedData
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.long 0 // SizeOfUninitializedData
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.long _start - ImageBase // AddressOfEntryPoint
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.long _start - ImageBase // BaseOfCode
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extra_header_fields:
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.quad 0 // ImageBase
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.long 0x1000 // SectionAlignment
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.long 0x200 // FileAlignment
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.short 0 // MajorOperatingSystemVersion
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.short 0 // MinorOperatingSystemVersion
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.short 0 // MajorImageVersion
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.short 0 // MinorImageVersion
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.short 0 // MajorSubsystemVersion
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.short 0 // MinorSubsystemVersion
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.long 0 // Win32VersionValue
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.long _edata - ImageBase // SizeOfImage
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// Everything before the kernel image is considered part of the header
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.long _start - ImageBase // SizeOfHeaders
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.long 0 // CheckSum
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.short EFI_SUBSYSTEM // Subsystem
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.short 0 // DllCharacteristics
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.quad 0 // SizeOfStackReserve
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.quad 0 // SizeOfStackCommit
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.quad 0 // SizeOfHeapReserve
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.quad 0 // SizeOfHeapCommit
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.long 0 // LoaderFlags
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.long 0x6 // NumberOfRvaAndSizes
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.quad 0 // ExportTable
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.quad 0 // ImportTable
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.quad 0 // ResourceTable
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.quad 0 // ExceptionTable
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.quad 0 // CertificationTable
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.quad 0 // BaseRelocationTable
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// Section table
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section_table:
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.ascii ".text\0\0\0"
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.long _data - _start // VirtualSize
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.long _start - ImageBase // VirtualAddress
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.long _data - _start // SizeOfRawData
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.long _start - ImageBase // PointerToRawData
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.long 0 // PointerToRelocations (0 for executables)
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.long 0 // PointerToLineNumbers (0 for executables)
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.short 0 // NumberOfRelocations (0 for executables)
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.short 0 // NumberOfLineNumbers (0 for executables)
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.long 0x60000020 // Characteristics (section flags)
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.ascii ".data\0\0\0"
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.long _data_size // VirtualSize
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.long _data - ImageBase // VirtualAddress
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.long _data_size // SizeOfRawData
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.long _data - ImageBase // PointerToRawData
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.long 0 // PointerToRelocations (0 for executables)
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.long 0 // PointerToLineNumbers (0 for executables)
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.short 0 // NumberOfRelocations (0 for executables)
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.short 0 // NumberOfLineNumbers (0 for executables)
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.long 0xc0000040 // Characteristics (section flags)
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.align 12
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_start:
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stp x29, x30, [sp, #-32]!
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mov x29, sp
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stp x0, x1, [sp, #16]
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mov x2, x0
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mov x3, x1
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adr x0, ImageBase
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adrp x1, _DYNAMIC
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add x1, x1, #:lo12:_DYNAMIC
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bl _relocate
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cbnz x0, 0f
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ldp x0, x1, [sp, #16]
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bl efi_main
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0: ldp x29, x30, [sp], #32
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ret
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