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#ifdef CONFIG_EFI_STUB
13		@ This is almost but not quite a NOP, since it does clobber the
14		@ condition flags. But it is the best we can do for EFI, since
15		@ PE/COFF expects the magic string "MZ" at offset 0, while the
16		@ ARM/Linux boot protocol expects an executable instruction
17		@ there.
18		.inst	MZ_MAGIC | (0x1310 << 16)	@ tstne r0, #0x4d000
19#else
20 AR_CLASS(	mov	r0, r0		)
21  M_CLASS(	nop.w			)
22#endif
23		.endm
24
25		.macro	__EFI_HEADER
26#ifdef CONFIG_EFI_STUB
27		.set	start_offset, __efi_start - start
28		.org	start + 0x3c
29		@
30		@ The PE header can be anywhere in the file, but for
31		@ simplicity we keep it together with the MSDOS header
32		@ The offset to the PE/COFF header needs to be at offset
33		@ 0x3C in the MSDOS header.
34		@ The only 2 fields of the MSDOS header that are used are this
35		@ PE/COFF offset, and the "MZ" bytes at offset 0x0.
36		@
37		.long	pe_header - start		@ Offset to the PE header.
38
39pe_header:
40		.long	PE_MAGIC
41
42coff_header:
43		.short	IMAGE_FILE_MACHINE_THUMB	@ Machine
44		.short	section_count			@ NumberOfSections
45		.long	0 				@ TimeDateStamp
46		.long	0				@ PointerToSymbolTable
47		.long	0				@ NumberOfSymbols
48		.short	section_table - optional_header	@ SizeOfOptionalHeader
49		.short	IMAGE_FILE_32BIT_MACHINE | \
50			IMAGE_FILE_DEBUG_STRIPPED | \
51			IMAGE_FILE_EXECUTABLE_IMAGE | \
52			IMAGE_FILE_LINE_NUMS_STRIPPED	@ Characteristics
53
54#define __pecoff_code_size (__pecoff_data_start - __efi_start)
55
56optional_header:
57		.short	PE_OPT_MAGIC_PE32		@ PE32 format
58		.byte	0x02				@ MajorLinkerVersion
59		.byte	0x14				@ MinorLinkerVersion
60		.long	__pecoff_code_size		@ SizeOfCode
61		.long	__pecoff_data_size		@ SizeOfInitializedData
62		.long	0				@ SizeOfUninitializedData
63		.long	efi_entry - start		@ AddressOfEntryPoint
64		.long	start_offset			@ BaseOfCode
65		.long	__pecoff_data_start - start	@ BaseOfData
66
67extra_header_fields:
68		.long	0				@ ImageBase
69		.long	SZ_4K				@ SectionAlignment
70		.long	SZ_512				@ FileAlignment
71		.short	0				@ MajorOsVersion
72		.short	0				@ MinorOsVersion
73		.short	LINUX_EFISTUB_MAJOR_VERSION	@ MajorImageVersion
74		.short	LINUX_EFISTUB_MINOR_VERSION	@ MinorImageVersion
75		.short	0				@ MajorSubsystemVersion
76		.short	0				@ MinorSubsystemVersion
77		.long	0				@ Win32VersionValue
78
79		.long	__pecoff_end - start		@ SizeOfImage
80		.long	start_offset			@ SizeOfHeaders
81		.long	0				@ CheckSum
82		.short	IMAGE_SUBSYSTEM_EFI_APPLICATION	@ Subsystem
83		.short	0				@ DllCharacteristics
84		.long	0				@ SizeOfStackReserve
85		.long	0				@ SizeOfStackCommit
86		.long	0				@ SizeOfHeapReserve
87		.long	0				@ SizeOfHeapCommit
88		.long	0				@ LoaderFlags
89		.long	(section_table - .) / 8		@ NumberOfRvaAndSizes
90
91		.quad	0				@ ExportTable
92		.quad	0				@ ImportTable
93		.quad	0				@ ResourceTable
94		.quad	0				@ ExceptionTable
95		.quad	0				@ CertificationTable
96		.quad	0				@ BaseRelocationTable
97
98section_table:
99		.ascii	".text\0\0\0"
100		.long	__pecoff_code_size		@ VirtualSize
101		.long	__efi_start			@ VirtualAddress
102		.long	__pecoff_code_size		@ SizeOfRawData
103		.long	__efi_start			@ PointerToRawData
104		.long	0				@ PointerToRelocations
105		.long	0				@ PointerToLineNumbers
106		.short	0				@ NumberOfRelocations
107		.short	0				@ NumberOfLineNumbers
108		.long	IMAGE_SCN_CNT_CODE | \
109			IMAGE_SCN_MEM_READ | \
110			IMAGE_SCN_MEM_EXECUTE		@ Characteristics
111
112		.ascii	".data\0\0\0"
113		.long	__pecoff_data_size		@ VirtualSize
114		.long	__pecoff_data_start - start	@ VirtualAddress
115		.long	__pecoff_data_rawsize		@ SizeOfRawData
116		.long	__pecoff_data_start - start	@ PointerToRawData
117		.long	0				@ PointerToRelocations
118		.long	0				@ PointerToLineNumbers
119		.short	0				@ NumberOfRelocations
120		.short	0				@ NumberOfLineNumbers
121		.long	IMAGE_SCN_CNT_INITIALIZED_DATA | \
122			IMAGE_SCN_MEM_READ | \
123			IMAGE_SCN_MEM_WRITE		@ Characteristics
124
125		.set	section_count, (. - section_table) / 40
126
127		.align	12
128__efi_start:
129#endif
130		.endm
131