summaryrefslogtreecommitdiff
path: root/arch/arm64/kernel/efi-header.S
blob: a71844fb923eef9669bd23b087b752c214b8a763 (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
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * Copyright (C) 2013 - 2017 Linaro, Ltd.
 * Copyright (C) 2013, 2014 Red Hat, Inc.
 */

#include <linux/pe.h>
#include <linux/sizes.h>

	.macro	__EFI_PE_HEADER
	.long	PE_MAGIC
coff_header:
	.short	IMAGE_FILE_MACHINE_ARM64		// Machine
	.short	section_count				// NumberOfSections
	.long	0 					// TimeDateStamp
	.long	0					// PointerToSymbolTable
	.long	0					// NumberOfSymbols
	.short	section_table - optional_header		// SizeOfOptionalHeader
	.short	IMAGE_FILE_DEBUG_STRIPPED | \
		IMAGE_FILE_EXECUTABLE_IMAGE | \
		IMAGE_FILE_LINE_NUMS_STRIPPED		// Characteristics

optional_header:
	.short	PE_OPT_MAGIC_PE32PLUS			// PE32+ format
	.byte	0x02					// MajorLinkerVersion
	.byte	0x14					// MinorLinkerVersion
	.long	__initdata_begin - efi_header_end	// SizeOfCode
	.long	__pecoff_data_size			// SizeOfInitializedData
	.long	0					// SizeOfUninitializedData
	.long	__efistub_efi_pe_entry - _head		// AddressOfEntryPoint
	.long	efi_header_end - _head			// BaseOfCode

extra_header_fields:
	.quad	0					// ImageBase
	.long	SEGMENT_ALIGN				// SectionAlignment
	.long	PECOFF_FILE_ALIGNMENT			// FileAlignment
	.short	0					// MajorOperatingSystemVersion
	.short	0					// MinorOperatingSystemVersion
	.short	LINUX_EFISTUB_MAJOR_VERSION		// MajorImageVersion
	.short	LINUX_EFISTUB_MINOR_VERSION		// MinorImageVersion
	.short	0					// MajorSubsystemVersion
	.short	0					// MinorSubsystemVersion
	.long	0					// Win32VersionValue

	.long	_end - _head				// SizeOfImage

	// Everything before the kernel image is considered part of the header
	.long	efi_header_end - _head			// 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	(section_table - .) / 8			// NumberOfRvaAndSizes

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

#ifdef CONFIG_DEBUG_EFI
	.long	efi_debug_table - _head			// DebugTable
	.long	efi_debug_table_size
#endif

	// Section table
section_table:
	.ascii	".text\0\0\0"
	.long	__initdata_begin - efi_header_end	// VirtualSize
	.long	efi_header_end - _head			// VirtualAddress
	.long	__initdata_begin - efi_header_end	// SizeOfRawData
	.long	efi_header_end - _head			// PointerToRawData

	.long	0					// PointerToRelocations
	.long	0					// PointerToLineNumbers
	.short	0					// NumberOfRelocations
	.short	0					// NumberOfLineNumbers
	.long	IMAGE_SCN_CNT_CODE | \
		IMAGE_SCN_MEM_READ | \
		IMAGE_SCN_MEM_EXECUTE			// Characteristics

	.ascii	".data\0\0\0"
	.long	__pecoff_data_size			// VirtualSize
	.long	__initdata_begin - _head		// VirtualAddress
	.long	__pecoff_data_rawsize			// SizeOfRawData
	.long	__initdata_begin - _head		// PointerToRawData

	.long	0					// PointerToRelocations
	.long	0					// PointerToLineNumbers
	.short	0					// NumberOfRelocations
	.short	0					// NumberOfLineNumbers
	.long	IMAGE_SCN_CNT_INITIALIZED_DATA | \
		IMAGE_SCN_MEM_READ | \
		IMAGE_SCN_MEM_WRITE			// Characteristics

	.set	section_count, (. - section_table) / 40

#ifdef CONFIG_DEBUG_EFI
	/*
	 * The debug table is referenced via its Relative Virtual Address (RVA),
	 * which is only defined for those parts of the image that are covered
	 * by a section declaration. Since this header is not covered by any
	 * section, the debug table must be emitted elsewhere. So stick it in
	 * the .init.rodata section instead.
	 *
	 * Note that the EFI debug entry itself may legally have a zero RVA,
	 * which means we can simply put it right after the section headers.
	 */
	__INITRODATA

	.align	2
efi_debug_table:
	// EFI_IMAGE_DEBUG_DIRECTORY_ENTRY
	.long	0					// Characteristics
	.long	0					// TimeDateStamp
	.short	0					// MajorVersion
	.short	0					// MinorVersion
	.long	IMAGE_DEBUG_TYPE_CODEVIEW		// Type
	.long	efi_debug_entry_size			// SizeOfData
	.long	0					// RVA
	.long	efi_debug_entry - _head			// FileOffset

	.set	efi_debug_table_size, . - efi_debug_table
	.previous

efi_debug_entry:
	// EFI_IMAGE_DEBUG_CODEVIEW_NB10_ENTRY
	.ascii	"NB10"					// Signature
	.long	0					// Unknown
	.long	0					// Unknown2
	.long	0					// Unknown3

	.asciz	VMLINUX_PATH

	.set	efi_debug_entry_size, . - efi_debug_entry
#endif

	/*
	 * EFI will load .text onwards at the 4k section alignment
	 * described in the PE/COFF header. To ensure that instruction
	 * sequences using an adrp and a :lo12: immediate will function
	 * correctly at this alignment, we must ensure that .text is
	 * placed at a 4k boundary in the Image to begin with.
	 */
	.balign	SEGMENT_ALIGN
efi_header_end:
	.endm