summaryrefslogtreecommitdiff
path: root/arch/arm/lib/crt0_aarch64_efi.S
blob: 9b0e894f8a2eb373ca4067205c7acd238cf3c67d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
/*
 * crt0-efi-aarch64.S - PE/COFF header for aarch64 EFI applications
 *
 * Copright (C) 2014 Linaro Ltd. <ard.biesheuvel@linaro.org>
 *
 * SPDX-License-Identifier:     GPL-2.0+     BSD-2-Clause
 *
 * This file is taken and modified from the gnu-efi project.
 */

#include <asm-generic/pe.h>

	.section	.text.head

	/*
	 * Magic "MZ" signature for PE/COFF
	 */
	.globl	ImageBase
ImageBase:
	.ascii	"MZ"
	.skip	58				/* 'MZ' + pad + offset == 64 */
	.long	pe_header - ImageBase		/* Offset to the PE header */
pe_header:
	.ascii	"PE"
	.short	0
coff_header:
	.short	0xaa64				/* AArch64 */
	.short	2				/* nr_sections */
	.long	0				/* TimeDateStamp */
	.long	0				/* PointerToSymbolTable */
	.long	1				/* NumberOfSymbols */
	.short	section_table - optional_header	/* SizeOfOptionalHeader */
	/*
	 * Characteristics: IMAGE_FILE_DEBUG_STRIPPED |
	 * IMAGE_FILE_EXECUTABLE_IMAGE | IMAGE_FILE_LINE_NUMS_STRIPPED
	 */
	.short	0x206
optional_header:
	.short	0x20b				/* PE32+ format */
	.byte	0x02				/* MajorLinkerVersion */
	.byte	0x14				/* MinorLinkerVersion */
	.long	_edata - _start			/* SizeOfCode */
	.long	0				/* SizeOfInitializedData */
	.long	0				/* SizeOfUninitializedData */
	.long	_start - ImageBase		/* AddressOfEntryPoint */
	.long	_start - ImageBase		/* BaseOfCode */

extra_header_fields:
	.quad	0				/* ImageBase */
	.long	0x20				/* SectionAlignment */
	.long	0x8				/* FileAlignment */
	.short	0				/* MajorOperatingSystemVersion */
	.short	0				/* MinorOperatingSystemVersion */
	.short	0				/* MajorImageVersion */
	.short	0				/* MinorImageVersion */
	.short	0				/* MajorSubsystemVersion */
	.short	0				/* MinorSubsystemVersion */
	.long	0				/* Win32VersionValue */

	.long	_edata - ImageBase		/* SizeOfImage */

	/*
	 * Everything before the kernel image is considered part of the header
	 */
	.long	_start - ImageBase		/* SizeOfHeaders */
	.long	0				/* CheckSum */
	.short	IMAGE_SUBSYSTEM_EFI_APPLICATION /* Subsystem */
	.short	0				/* DllCharacteristics */
	.quad	0				/* SizeOfStackReserve */
	.quad	0				/* SizeOfStackCommit */
	.quad	0				/* SizeOfHeapReserve */
	.quad	0				/* SizeOfHeapCommit */
	.long	0				/* LoaderFlags */
	.long	0x6				/* NumberOfRvaAndSizes */

	.quad	0				/* ExportTable */
	.quad	0				/* ImportTable */
	.quad	0				/* ResourceTable */
	.quad	0				/* ExceptionTable */
	.quad	0				/* CertificationTable */
	.quad	0				/* BaseRelocationTable */

	/* Section table */
section_table:

	/*
	 * The EFI application loader requires a relocation section
	 * because EFI applications must be relocatable.  This is a
	 * dummy section as far as we are concerned.
	 */
	.ascii	".reloc"
	.byte	0
	.byte	0			/* end of 0 padding of section name */
	.long	0
	.long	0
	.long	0			/* SizeOfRawData */
	.long	0			/* PointerToRawData */
	.long	0			/* PointerToRelocations */
	.long	0			/* PointerToLineNumbers */
	.short	0			/* NumberOfRelocations */
	.short	0			/* NumberOfLineNumbers */
	.long	0x42100040		/* Characteristics (section flags) */


	.ascii	".text"
	.byte	0
	.byte	0
	.byte	0			/* end of 0 padding of section name */
	.long	_edata - _start		/* VirtualSize */
	.long	_start - ImageBase	/* VirtualAddress */
	.long	_edata - _start		/* SizeOfRawData */
	.long	_start - ImageBase	/* PointerToRawData */

	.long	0		/* PointerToRelocations (0 for executables) */
	.long	0		/* PointerToLineNumbers (0 for executables) */
	.short	0		/* NumberOfRelocations  (0 for executables) */
	.short	0		/* NumberOfLineNumbers  (0 for executables) */
	.long	0xe0500020	/* Characteristics (section flags) */

_start:
	stp		x29, x30, [sp, #-32]!
	mov		x29, sp

	stp		x0, x1, [sp, #16]
	mov		x2, x0
	mov		x3, x1
	adr		x0, ImageBase
	adrp		x1, _DYNAMIC
	add		x1, x1, #:lo12:_DYNAMIC
	bl		_relocate
	cbnz		x0, 0f

	ldp		x0, x1, [sp, #16]
	bl		efi_main

0:	ldp		x29, x30, [sp], #32
	ret