1/*
2 * Copyright (C) 2013-2017 Linaro Ltd
3 * Authors: Roy Franz <roy.franz@linaro.org>
4 *          Ard Biesheuvel <ard.biesheuvel@linaro.org>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10
11#include <linux/pe.h>
12#include <linux/sizes.h>
13
14		.macro	__nop
15#ifdef CONFIG_EFI_STUB
16		@ This is almost but not quite a NOP, since it does clobber the
17		@ condition flags. But it is the best we can do for EFI, since
18		@ PE/COFF expects the magic string "MZ" at offset 0, while the
19		@ ARM/Linux boot protocol expects an executable instruction
20		@ there.
21		.inst	MZ_MAGIC | (0x1310 << 16)	@ tstne r0, #0x4d000
22#else
23 AR_CLASS(	mov	r0, r0		)
24  M_CLASS(	nop.w			)
25#endif
26		.endm
27
28		.macro	__EFI_HEADER
29#ifdef CONFIG_EFI_STUB
30		.set	start_offset, __efi_start - start
31		.org	start + 0x3c
32		@
33		@ The PE header can be anywhere in the file, but for
34		@ simplicity we keep it together with the MSDOS header
35		@ The offset to the PE/COFF header needs to be at offset
36		@ 0x3C in the MSDOS header.
37		@ The only 2 fields of the MSDOS header that are used are this
38		@ PE/COFF offset, and the "MZ" bytes at offset 0x0.
39		@
40		.long	pe_header - start		@ Offset to the PE header.
41
42pe_header:
43		.long	PE_MAGIC
44
45coff_header:
46		.short	IMAGE_FILE_MACHINE_THUMB	@ Machine
47		.short	section_count			@ NumberOfSections
48		.long	0 				@ TimeDateStamp
49		.long	0				@ PointerToSymbolTable
50		.long	0				@ NumberOfSymbols
51		.short	section_table - optional_header	@ SizeOfOptionalHeader
52		.short	IMAGE_FILE_32BIT_MACHINE | \
53			IMAGE_FILE_DEBUG_STRIPPED | \
54			IMAGE_FILE_EXECUTABLE_IMAGE | \
55			IMAGE_FILE_LINE_NUMS_STRIPPED	@ Characteristics
56
57#define __pecoff_code_size (__pecoff_data_start - __efi_start)
58
59optional_header:
60		.short	PE_OPT_MAGIC_PE32		@ PE32 format
61		.byte	0x02				@ MajorLinkerVersion
62		.byte	0x14				@ MinorLinkerVersion
63		.long	__pecoff_code_size		@ SizeOfCode
64		.long	__pecoff_data_size		@ SizeOfInitializedData
65		.long	0				@ SizeOfUninitializedData
66		.long	efi_stub_entry - start		@ AddressOfEntryPoint
67		.long	start_offset			@ BaseOfCode
68		.long	__pecoff_data_start - start	@ BaseOfData
69
70extra_header_fields:
71		.long	0				@ ImageBase
72		.long	SZ_4K				@ SectionAlignment
73		.long	SZ_512				@ FileAlignment
74		.short	0				@ MajorOsVersion
75		.short	0				@ MinorOsVersion
76		.short	0				@ MajorImageVersion
77		.short	0				@ MinorImageVersion
78		.short	0				@ MajorSubsystemVersion
79		.short	0				@ MinorSubsystemVersion
80		.long	0				@ Win32VersionValue
81
82		.long	__pecoff_end - start		@ SizeOfImage
83		.long	start_offset			@ SizeOfHeaders
84		.long	0				@ CheckSum
85		.short	IMAGE_SUBSYSTEM_EFI_APPLICATION	@ Subsystem
86		.short	0				@ DllCharacteristics
87		.long	0				@ SizeOfStackReserve
88		.long	0				@ SizeOfStackCommit
89		.long	0				@ SizeOfHeapReserve
90		.long	0				@ SizeOfHeapCommit
91		.long	0				@ LoaderFlags
92		.long	(section_table - .) / 8		@ NumberOfRvaAndSizes
93
94		.quad	0				@ ExportTable
95		.quad	0				@ ImportTable
96		.quad	0				@ ResourceTable
97		.quad	0				@ ExceptionTable
98		.quad	0				@ CertificationTable
99		.quad	0				@ BaseRelocationTable
100
101section_table:
102		.ascii	".text\0\0\0"
103		.long	__pecoff_code_size		@ VirtualSize
104		.long	__efi_start			@ VirtualAddress
105		.long	__pecoff_code_size		@ SizeOfRawData
106		.long	__efi_start			@ PointerToRawData
107		.long	0				@ PointerToRelocations
108		.long	0				@ PointerToLineNumbers
109		.short	0				@ NumberOfRelocations
110		.short	0				@ NumberOfLineNumbers
111		.long	IMAGE_SCN_CNT_CODE | \
112			IMAGE_SCN_MEM_READ | \
113			IMAGE_SCN_MEM_EXECUTE		@ Characteristics
114
115		.ascii	".data\0\0\0"
116		.long	__pecoff_data_size		@ VirtualSize
117		.long	__pecoff_data_start - start	@ VirtualAddress
118		.long	__pecoff_data_rawsize		@ SizeOfRawData
119		.long	__pecoff_data_start - start	@ PointerToRawData
120		.long	0				@ PointerToRelocations
121		.long	0				@ PointerToLineNumbers
122		.short	0				@ NumberOfRelocations
123		.short	0				@ NumberOfLineNumbers
124		.long	IMAGE_SCN_CNT_INITIALIZED_DATA | \
125			IMAGE_SCN_MEM_READ | \
126			IMAGE_SCN_MEM_WRITE		@ Characteristics
127
128		.set	section_count, (. - section_table) / 40
129
130		.align	12
131__efi_start:
132#endif
133		.endm
134