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crt0-efi-aarch64.S revision 1.1.1.1.2.2 
      1 /*	$NetBSD: crt0-efi-aarch64.S,v 1.1.1.1.2.2 2018/09/06 06:56:38 pgoyette Exp $	*/
      2 
      3 /*
      4  * crt0-efi-aarch64.S - PE/COFF header for AArch64 EFI applications
      5  *
      6  * Copright (C) 2014 Linaro Ltd. <ard.biesheuvel (at) linaro.org>
      7  *
      8  * Redistribution and use in source and binary forms, with or without
      9  * modification, are permitted provided that the following conditions
     10  * are met:
     11  * 1. Redistributions of source code must retain the above copyright
     12  *    notice and this list of conditions, without modification.
     13  * 2. The name of the author may not be used to endorse or promote products
     14  *    derived from this software without specific prior written permission.
     15  *
     16  * Alternatively, this software may be distributed under the terms of the
     17  * GNU General Public License as published by the Free Software Foundation;
     18  * either version 2 of the License, or (at your option) any later version.
     19  */
     20 
     21 	.section	.text.head
     22 
     23 	/*
     24 	 * Magic "MZ" signature for PE/COFF
     25 	 */
     26 	.globl	ImageBase
     27 ImageBase:
     28 	.ascii	"MZ"
     29 	.skip	58				// 'MZ' + pad + offset == 64
     30 	.long	pe_header - ImageBase		// Offset to the PE header.
     31 pe_header:
     32 	.ascii	"PE"
     33 	.short 	0
     34 coff_header:
     35 	.short	0xaa64				// AArch64
     36 	.short	2				// nr_sections
     37 	.long	0 				// TimeDateStamp
     38 	.long	0				// PointerToSymbolTable
     39 	.long	1				// NumberOfSymbols
     40 	.short	section_table - optional_header	// SizeOfOptionalHeader
     41 	.short	0x206				// Characteristics.
     42 						// IMAGE_FILE_DEBUG_STRIPPED |
     43 						// IMAGE_FILE_EXECUTABLE_IMAGE |
     44 						// IMAGE_FILE_LINE_NUMS_STRIPPED
     45 optional_header:
     46 	.short	0x20b				// PE32+ format
     47 	.byte	0x02				// MajorLinkerVersion
     48 	.byte	0x14				// MinorLinkerVersion
     49 	.long	_data - _start			// SizeOfCode
     50 	.long	_data_size			// SizeOfInitializedData
     51 	.long	0				// SizeOfUninitializedData
     52 	.long	_start - ImageBase		// AddressOfEntryPoint
     53 	.long	_start - ImageBase		// BaseOfCode
     54 
     55 extra_header_fields:
     56 	.quad	0				// ImageBase
     57 	.long	0x1000				// SectionAlignment
     58 	.long	0x200				// FileAlignment
     59 	.short	0				// MajorOperatingSystemVersion
     60 	.short	0				// MinorOperatingSystemVersion
     61 	.short	0				// MajorImageVersion
     62 	.short	0				// MinorImageVersion
     63 	.short	0				// MajorSubsystemVersion
     64 	.short	0				// MinorSubsystemVersion
     65 	.long	0				// Win32VersionValue
     66 
     67 	.long	_edata - ImageBase		// SizeOfImage
     68 
     69 	// Everything before the kernel image is considered part of the header
     70 	.long	_start - ImageBase		// SizeOfHeaders
     71 	.long	0				// CheckSum
     72 	.short	EFI_SUBSYSTEM			// Subsystem
     73 	.short	0				// DllCharacteristics
     74 	.quad	0				// SizeOfStackReserve
     75 	.quad	0				// SizeOfStackCommit
     76 	.quad	0				// SizeOfHeapReserve
     77 	.quad	0				// SizeOfHeapCommit
     78 	.long	0				// LoaderFlags
     79 	.long	0x6				// NumberOfRvaAndSizes
     80 
     81 	.quad	0				// ExportTable
     82 	.quad	0				// ImportTable
     83 	.quad	0				// ResourceTable
     84 	.quad	0				// ExceptionTable
     85 	.quad	0				// CertificationTable
     86 	.quad	0				// BaseRelocationTable
     87 
     88 	// Section table
     89 section_table:
     90 	.ascii	".text\0\0\0"
     91 	.long	_data - _start		// VirtualSize
     92 	.long	_start - ImageBase	// VirtualAddress
     93 	.long	_data - _start		// SizeOfRawData
     94 	.long	_start - ImageBase	// PointerToRawData
     95 
     96 	.long	0		// PointerToRelocations (0 for executables)
     97 	.long	0		// PointerToLineNumbers (0 for executables)
     98 	.short	0		// NumberOfRelocations  (0 for executables)
     99 	.short	0		// NumberOfLineNumbers  (0 for executables)
    100 	.long	0x60000020	// Characteristics (section flags)
    101 
    102 	.ascii	".data\0\0\0"
    103 	.long	_data_size		// VirtualSize
    104 	.long	_data - ImageBase	// VirtualAddress
    105 	.long	_data_size		// SizeOfRawData
    106 	.long	_data - ImageBase	// PointerToRawData
    107 
    108 	.long	0		// PointerToRelocations (0 for executables)
    109 	.long	0		// PointerToLineNumbers (0 for executables)
    110 	.short	0		// NumberOfRelocations  (0 for executables)
    111 	.short	0		// NumberOfLineNumbers  (0 for executables)
    112 	.long	0xc0000040	// Characteristics (section flags)
    113 
    114 	.align		12
    115 _start:
    116 	stp		x29, x30, [sp, #-32]!
    117 	mov		x29, sp
    118 
    119 	stp		x0, x1, [sp, #16]
    120 	mov		x2, x0
    121 	mov		x3, x1
    122 	adr		x0, ImageBase
    123 	adrp		x1, _DYNAMIC
    124 	add		x1, x1, #:lo12:_DYNAMIC
    125 	bl		_relocate
    126 	cbnz		x0, 0f
    127 
    128 	ldp		x0, x1, [sp, #16]
    129 	bl		efi_main
    130 
    131 0:	ldp		x29, x30, [sp], #32
    132 	ret
    133