24a4cd0e56
* Force code to be at known dest of 4096 * Move _start into .text * Load the _start symbol address and then minus 4096 to get the load address Signed-off-by: Callum Farmer <gmbr3@opensuse.org>
192 lines
5.9 KiB
ArmAsm
192 lines
5.9 KiB
ArmAsm
/*
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* crt0-efi-arm.S - PE/COFF header for ARM EFI applications
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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 0x1c2 // Mixed ARM/Thumb
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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 _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 _text - ImageBase // AddressOfEntryPoint
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.4byte _text - 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 _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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.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 _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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stmfd sp!, {r0-r2, lr}
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mov r2, r0
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mov r3, r1
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adr r1, .L_DYNAMIC
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ldr r0, [r1]
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add r1, r0, r1
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adr r0, _start
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sub r0, r0, #0x1000
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bl _relocate
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teq r0, #0
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bne 0f
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ldmfd sp, {r0-r1}
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bl _entry
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0: add sp, sp, #12
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ldr pc, [sp], #4
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.L_DYNAMIC:
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.4byte _DYNAMIC - .
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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 .areloc
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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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