mirror of https://github.com/ncroxon/gnu-efi
188 lines
5.9 KiB
ArmAsm
188 lines
5.9 KiB
ArmAsm
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/*
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* crt0-efi-aarch64-local.S - PE/COFF header for AArch64 EFI applications (without suitable objcopy)
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*
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* Copyright (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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.4byte pe_header - ImageBase // Offset to the PE header.
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pe_header:
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.ascii "PE"
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.2byte 0
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coff_header:
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.2byte 0xaa64 // AArch64
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.2byte NR_SECTIONS // nr_sections
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.4byte 0 // TimeDateStamp
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.4byte 0 // PointerToSymbolTable
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.4byte 0 // NumberOfSymbols
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.2byte section_table - optional_header // SizeOfOptionalHeader
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.2byte 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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.2byte 0x20b // PE32+ format
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.byte 0x02 // MajorLinkerVersion
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.byte 0x14 // MinorLinkerVersion
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.4byte _text_size - ImageBase // SizeOfCode
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.4byte _alldata_size - ImageBase // SizeOfInitializedData
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.4byte 0 // SizeOfUninitializedData
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.4byte _start - ImageBase // AddressOfEntryPoint
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.4byte _text - ImageBase // BaseOfCode
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extra_header_fields:
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.8byte 0 // ImageBase
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.4byte 0x1000 // SectionAlignment
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.4byte 0x1000 // FileAlignment
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.2byte 0 // MajorOperatingSystemVersion
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.2byte 0 // MinorOperatingSystemVersion
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.2byte 0 // MajorImageVersion
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.2byte 0 // MinorImageVersion
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.2byte 0 // MajorSubsystemVersion
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.2byte 0 // MinorSubsystemVersion
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.4byte 0 // Win32VersionValue
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.4byte _image_end - ImageBase // SizeOfImage
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// Everything before the kernel image is considered part of the header
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.4byte _text - ImageBase // SizeOfHeaders
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.4byte 0 // CheckSum
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.2byte EFI_SUBSYSTEM // Subsystem
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.2byte 0 // DllCharacteristics
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.8byte 0 // SizeOfStackReserve
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.8byte 0 // SizeOfStackCommit
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.8byte 0 // SizeOfHeapReserve
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.8byte 0 // SizeOfHeapCommit
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.4byte 0 // LoaderFlags
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.4byte 0x10 // NumberOfRvaAndSizes
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.8byte 0 // ExportTable
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.8byte 0 // ImportTable
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.8byte 0 // ResourceTable
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.8byte 0 // ExceptionTable
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.8byte 0 // CertificationTable
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.4byte _reloc - ImageBase // BaseRelocationTable (VirtualAddress)
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.4byte _reloc_vsize - ImageBase // BaseRelocationTable (Size)
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.8byte 0 // Debug
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.8byte 0 // Architecture
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.8byte 0 // Global Ptr
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.8byte 0 // TLS Table
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.8byte 0 // Load Config Table
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.8byte 0 // Bound Import
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.8byte 0 // IAT
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.8byte 0 // Delay Import Descriptor
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.8byte 0 // CLR Runtime Header
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.8byte 0 // Reserved, must be zero
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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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.4byte _text_vsize - ImageBase // VirtualSize
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.4byte _text - ImageBase // VirtualAddress
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.4byte _text_size - ImageBase // SizeOfRawData
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.4byte _text - ImageBase // PointerToRawData
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.4byte 0 // PointerToRelocations (0 for executables)
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.4byte 0 // PointerToLineNumbers (0 for executables)
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.2byte 0 // NumberOfRelocations (0 for executables)
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.2byte 0 // NumberOfLineNumbers (0 for executables)
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.4byte 0x60000020 // Characteristics (section flags)
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/*
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* The EFI application loader requires a relocation section
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* because EFI applications must be relocatable. This is a
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* dummy section as far as we are concerned.
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*/
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.ascii ".reloc\0\0"
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.4byte _reloc_vsize - ImageBase // VirtualSize
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.4byte _reloc - ImageBase // VirtualAddress
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.4byte _reloc_size - ImageBase // SizeOfRawData
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.4byte _reloc - ImageBase // PointerToRawData
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.4byte 0 // PointerToRelocations
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.4byte 0 // PointerToLineNumbers
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.2byte 0 // NumberOfRelocations
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.2byte 0 // NumberOfLineNumbers
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.4byte 0x42000040 // Characteristics (section flags)
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.ascii ".data\0\0\0"
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.4byte _data_vsize - ImageBase // VirtualSize
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.4byte _data - ImageBase // VirtualAddress
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.4byte _data_size - ImageBase // SizeOfRawData
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.4byte _data - ImageBase // PointerToRawData
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.4byte 0 // PointerToRelocations
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.4byte 0 // PointerToLineNumbers
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.2byte 0 // NumberOfRelocations
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.2byte 0 // NumberOfLineNumbers
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.4byte 0xC0000040 // Characteristics (section flags)
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.ascii ".rodata\0"
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.4byte _rodata_vsize - ImageBase // VirtualSize
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.4byte _rodata - ImageBase // VirtualAddress
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.4byte _rodata_size - ImageBase // SizeOfRawData
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.4byte _rodata - ImageBase // PointerToRawData
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.4byte 0 // PointerToRelocations
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.4byte 0 // PointerToLineNumbers
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.2byte 0 // NumberOfRelocations
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.2byte 0 // NumberOfLineNumbers
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.4byte 0x40000040 // Characteristics (section flags)
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.text
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.globl _start
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.type _start,%function
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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 _entry
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0: ldp x29, x30, [sp], #32
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ret
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// hand-craft a dummy .reloc section so EFI knows it's a relocatable executable:
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.data
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dummy: .4byte 0
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#define IMAGE_REL_ABSOLUTE 0
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.section .reloc, "a"
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label1:
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.4byte dummy-label1 // Page RVA
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.4byte 12 // Block Size (2*4+2*2), must be aligned by 32 Bits
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.2byte (IMAGE_REL_ABSOLUTE<<12) + 0 // reloc for dummy
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.2byte (IMAGE_REL_ABSOLUTE<<12) + 0 // reloc for dummy
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#if defined(__ELF__) && defined(__linux__)
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.section .note.GNU-stack,"",%progbits
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#endif
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