177 lines
5.3 KiB
ArmAsm
177 lines
5.3 KiB
ArmAsm
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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 0x14c // i386+
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.2byte 4 // 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 0x306 // Characteristics.
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// IMAGE_FILE_32BIT_MACHINE |
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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 0x10b // PE32+ format
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.byte 0x02 // MajorLinkerVersion
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.byte 0x14 // MinorLinkerVersion
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.4byte _etext - _start // 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 _start - ImageBase // BaseOfCode
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.4byte _reloc - ImageBase // BaseOfData
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extra_header_fields:
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.4byte 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 _start - 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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.4byte 0 // SizeOfStackReserve
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.4byte 0 // SizeOfStackCommit
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.4byte 0 // SizeOfHeapReserve
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.4byte 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 _evtext - _start // VirtualSize
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.4byte _start - ImageBase // VirtualAddress
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.4byte _etext - _start // SizeOfRawData
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.4byte _start - 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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.globl _start
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.type _start,%function
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_start:
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pushl %ebp
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movl %esp,%ebp
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pushl 12(%ebp) # copy "image" argument
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pushl 8(%ebp) # copy "systab" argument
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call 0f
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0: popl %eax
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movl %eax,%ebx
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addl $ImageBase-0b,%eax # %eax = ldbase
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addl $_DYNAMIC-0b,%ebx # %ebx = _DYNAMIC
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pushl %ebx # pass _DYNAMIC as second argument
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pushl %eax # pass ldbase as first argument
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call _relocate
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popl %ebx
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popl %ebx
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testl %eax,%eax
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jne .exit
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call _entry # call app with "image" and "systab" argument
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.exit: leave
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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
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.4byte dummy // 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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