1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3  * Copyright (C) 2013-2017 Linaro Ltd
4  * Authors: Roy Franz <roy.franz@linaro.org>
5  *          Ard Biesheuvel <ard.biesheuvel@linaro.org>
6  */
7 
8 #include <linux/pe.h>
9 #include <linux/sizes.h>
10 
11 		.macro	__nop
12  AR_CLASS(	mov	r0, r0		)
13   M_CLASS(	nop.w			)
14 		.endm
15 
16 		.macro __initial_nops
17 #ifdef CONFIG_EFI_STUB
18 		@ This is a two-instruction NOP, which happens to bear the
19 		@ PE/COFF signature "MZ" in the first two bytes, so the kernel
20 		@ is accepted as an EFI binary. Booting via the UEFI stub
21 		@ will not execute those instructions, but the ARM/Linux
22 		@ boot protocol does, so we need some NOPs here.
23 		.inst	MZ_MAGIC | (0xe225 << 16)	@ eor r5, r5, 0x4d000
24 		eor	r5, r5, 0x4d000			@ undo previous insn
25 #else
26 		__nop
27 		__nop
28 #endif
29 		.endm
30 
31 		.macro	__EFI_HEADER
32 #ifdef CONFIG_EFI_STUB
33 		.set	start_offset, __efi_start - start
34 		.org	start + 0x3c
35 		@
36 		@ The PE header can be anywhere in the file, but for
37 		@ simplicity we keep it together with the MSDOS header
38 		@ The offset to the PE/COFF header needs to be at offset
39 		@ 0x3C in the MSDOS header.
40 		@ The only 2 fields of the MSDOS header that are used are this
41 		@ PE/COFF offset, and the "MZ" bytes at offset 0x0.
42 		@
43 		.long	pe_header - start		@ Offset to the PE header.
44 
45 pe_header:
46 		.long	PE_MAGIC
47 
48 coff_header:
49 		.short	IMAGE_FILE_MACHINE_THUMB	@ Machine
50 		.short	section_count			@ NumberOfSections
51 		.long	0 				@ TimeDateStamp
52 		.long	0				@ PointerToSymbolTable
53 		.long	0				@ NumberOfSymbols
54 		.short	section_table - optional_header	@ SizeOfOptionalHeader
55 		.short	IMAGE_FILE_32BIT_MACHINE | \
56 			IMAGE_FILE_DEBUG_STRIPPED | \
57 			IMAGE_FILE_EXECUTABLE_IMAGE | \
58 			IMAGE_FILE_LINE_NUMS_STRIPPED	@ Characteristics
59 
60 #define __pecoff_code_size (__pecoff_data_start - __efi_start)
61 
62 optional_header:
63 		.short	PE_OPT_MAGIC_PE32		@ PE32 format
64 		.byte	0x02				@ MajorLinkerVersion
65 		.byte	0x14				@ MinorLinkerVersion
66 		.long	__pecoff_code_size		@ SizeOfCode
67 		.long	__pecoff_data_size		@ SizeOfInitializedData
68 		.long	0				@ SizeOfUninitializedData
69 		.long	efi_pe_entry - start		@ AddressOfEntryPoint
70 		.long	start_offset			@ BaseOfCode
71 		.long	__pecoff_data_start - start	@ BaseOfData
72 
73 extra_header_fields:
74 		.long	0				@ ImageBase
75 		.long	SZ_4K				@ SectionAlignment
76 		.long	SZ_512				@ FileAlignment
77 		.short	0				@ MajorOsVersion
78 		.short	0				@ MinorOsVersion
79 		.short	LINUX_EFISTUB_MAJOR_VERSION	@ MajorImageVersion
80 		.short	LINUX_EFISTUB_MINOR_VERSION	@ MinorImageVersion
81 		.short	0				@ MajorSubsystemVersion
82 		.short	0				@ MinorSubsystemVersion
83 		.long	0				@ Win32VersionValue
84 
85 		.long	__pecoff_end - start		@ SizeOfImage
86 		.long	start_offset			@ SizeOfHeaders
87 		.long	0				@ CheckSum
88 		.short	IMAGE_SUBSYSTEM_EFI_APPLICATION	@ Subsystem
89 		.short	0				@ DllCharacteristics
90 		.long	0				@ SizeOfStackReserve
91 		.long	0				@ SizeOfStackCommit
92 		.long	0				@ SizeOfHeapReserve
93 		.long	0				@ SizeOfHeapCommit
94 		.long	0				@ LoaderFlags
95 		.long	(section_table - .) / 8		@ NumberOfRvaAndSizes
96 
97 		.quad	0				@ ExportTable
98 		.quad	0				@ ImportTable
99 		.quad	0				@ ResourceTable
100 		.quad	0				@ ExceptionTable
101 		.quad	0				@ CertificationTable
102 		.quad	0				@ BaseRelocationTable
103 
104 section_table:
105 		.ascii	".text\0\0\0"
106 		.long	__pecoff_code_size		@ VirtualSize
107 		.long	__efi_start			@ VirtualAddress
108 		.long	__pecoff_code_size		@ SizeOfRawData
109 		.long	__efi_start			@ PointerToRawData
110 		.long	0				@ PointerToRelocations
111 		.long	0				@ PointerToLineNumbers
112 		.short	0				@ NumberOfRelocations
113 		.short	0				@ NumberOfLineNumbers
114 		.long	IMAGE_SCN_CNT_CODE | \
115 			IMAGE_SCN_MEM_READ | \
116 			IMAGE_SCN_MEM_EXECUTE		@ Characteristics
117 
118 		.ascii	".data\0\0\0"
119 		.long	__pecoff_data_size		@ VirtualSize
120 		.long	__pecoff_data_start - start	@ VirtualAddress
121 		.long	__pecoff_data_rawsize		@ SizeOfRawData
122 		.long	__pecoff_data_start - start	@ PointerToRawData
123 		.long	0				@ PointerToRelocations
124 		.long	0				@ PointerToLineNumbers
125 		.short	0				@ NumberOfRelocations
126 		.short	0				@ NumberOfLineNumbers
127 		.long	IMAGE_SCN_CNT_INITIALIZED_DATA | \
128 			IMAGE_SCN_MEM_READ | \
129 			IMAGE_SCN_MEM_WRITE		@ Characteristics
130 
131 		.set	section_count, (. - section_table) / 40
132 
133 		.align	12
134 __efi_start:
135 #endif
136 		.endm
137