mirror of https://github.com/ncroxon/gnu-efi
203 lines
5.1 KiB
ArmAsm
203 lines
5.1 KiB
ArmAsm
/*
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* crt0-efi-mips64el.S - PE/COFF header for MIPS64 EFI applications
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*
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* Copyright (C) 2014 Linaro Ltd. <ard.biesheuvel@linaro.org>
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* Copyright (C) 2017 Heiher <r@hev.cc>
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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 0x166 // MIPS little endian
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.2byte 2 // 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 _edata - _start // SizeOfCode
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.4byte 0 // 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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extra_header_fields:
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.8byte 0 // ImageBase
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.4byte 0x20 // SectionAlignment
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.4byte 0x8 // 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 _edata - 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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.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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.8byte 0 // BaseRelocationTable
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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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/*
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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"
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.byte 0
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.byte 0 // end of 0 padding of section name
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.4byte 0
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.4byte 0
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.4byte 0 // SizeOfRawData
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.4byte 0 // 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 0x42100040 // Characteristics (section flags)
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.ascii ".text"
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.byte 0
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.byte 0
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.byte 0 // end of 0 padding of section name
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.4byte _edata - _start // VirtualSize
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.4byte _start - ImageBase // VirtualAddress
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.4byte _edata - _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 0xe0500020 // Characteristics (section flags)
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.set push
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.set noreorder
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.align 4
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.globl _start
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.ent _start
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.type _start, @function
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_start:
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daddiu $sp, -32
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sd $ra, ($sp)
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// Get pc & gp
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.align 3
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bal 1f
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sd $gp, 8($sp)
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_pc:
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.dword _gp
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.dword _DYNAMIC
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.dword _relocate
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1:
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// pc in ra
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ld $gp, ($ra)
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dli $t0, _pc
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dsubu $gp, $t0
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daddu $gp, $ra
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sd $a0, 16($sp)
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sd $a1, 24($sp)
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// a2: ImageHandle
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move $a2, $a0
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// a3: SystemTable
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move $a3, $a1
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// a0: ImageBase
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dli $t1, ImageBase - _pc
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daddu $a0, $ra, $t1
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// a1: DynamicSection
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ld $t1, 8($ra)
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dsubu $t1, $t0
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daddu $a1, $ra, $t1
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// call _relocate
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ld $t1, 16($ra)
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dsubu $t1, $t0
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daddu $t9, $ra, $t1
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jalr $t9
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nop
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bnez $v0, 1b
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nop
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// a0: ImageHandle
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ld $a0, 16($sp)
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// call _start
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dla $t9, _entry
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jalr $t9
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// a1: SystemTable
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ld $a1, 24($sp)
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1:
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ld $gp, 8($sp)
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ld $ra, ($sp)
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jr $ra
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daddiu $sp, 32
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.end _start
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.set pop
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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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