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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
45pe_header:
46 .long PE_MAGIC
47
48coff_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
62optional_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
73extra_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
104section_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
1/*
2 * Copyright (C) 2013-2015 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 .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 'M' | ('Z' << 8) | (0x1310 << 16) @ tstne r0, #0x4d000
19#else
20 mov r0, r0
21#endif
22 .endm
23
24 .macro __EFI_HEADER
25#ifdef CONFIG_EFI_STUB
26 b __efi_start
27
28 .set start_offset, __efi_start - start
29 .org start + 0x3c
30 @
31 @ The PE header can be anywhere in the file, but for
32 @ simplicity we keep it together with the MSDOS header
33 @ The offset to the PE/COFF header needs to be at offset
34 @ 0x3C in the MSDOS header.
35 @ The only 2 fields of the MSDOS header that are used are this
36 @ PE/COFF offset, and the "MZ" bytes at offset 0x0.
37 @
38 .long pe_header - start @ Offset to the PE header.
39
40pe_header:
41 .ascii "PE\0\0"
42
43coff_header:
44 .short 0x01c2 @ ARM or Thumb
45 .short 2 @ nr_sections
46 .long 0 @ TimeDateStamp
47 .long 0 @ PointerToSymbolTable
48 .long 1 @ NumberOfSymbols
49 .short section_table - optional_header
50 @ SizeOfOptionalHeader
51 .short 0x306 @ Characteristics.
52 @ IMAGE_FILE_32BIT_MACHINE |
53 @ IMAGE_FILE_DEBUG_STRIPPED |
54 @ IMAGE_FILE_EXECUTABLE_IMAGE |
55 @ IMAGE_FILE_LINE_NUMS_STRIPPED
56
57optional_header:
58 .short 0x10b @ PE32 format
59 .byte 0x02 @ MajorLinkerVersion
60 .byte 0x14 @ MinorLinkerVersion
61 .long _end - __efi_start @ SizeOfCode
62 .long 0 @ SizeOfInitializedData
63 .long 0 @ SizeOfUninitializedData
64 .long efi_stub_entry - start @ AddressOfEntryPoint
65 .long start_offset @ BaseOfCode
66 .long 0 @ data
67
68extra_header_fields:
69 .long 0 @ ImageBase
70 .long 0x200 @ SectionAlignment
71 .long 0x200 @ FileAlignment
72 .short 0 @ MajorOperatingSystemVersion
73 .short 0 @ MinorOperatingSystemVersion
74 .short 0 @ MajorImageVersion
75 .short 0 @ MinorImageVersion
76 .short 0 @ MajorSubsystemVersion
77 .short 0 @ MinorSubsystemVersion
78 .long 0 @ Win32VersionValue
79
80 .long _end - start @ SizeOfImage
81 .long start_offset @ SizeOfHeaders
82 .long 0 @ CheckSum
83 .short 0xa @ Subsystem (EFI application)
84 .short 0 @ DllCharacteristics
85 .long 0 @ SizeOfStackReserve
86 .long 0 @ SizeOfStackCommit
87 .long 0 @ SizeOfHeapReserve
88 .long 0 @ SizeOfHeapCommit
89 .long 0 @ LoaderFlags
90 .long 0x6 @ NumberOfRvaAndSizes
91
92 .quad 0 @ ExportTable
93 .quad 0 @ ImportTable
94 .quad 0 @ ResourceTable
95 .quad 0 @ ExceptionTable
96 .quad 0 @ CertificationTable
97 .quad 0 @ BaseRelocationTable
98
99section_table:
100 @
101 @ The EFI application loader requires a relocation section
102 @ because EFI applications must be relocatable. This is a
103 @ dummy section as far as we are concerned.
104 @
105 .ascii ".reloc\0\0"
106 .long 0 @ VirtualSize
107 .long 0 @ VirtualAddress
108 .long 0 @ SizeOfRawData
109 .long 0 @ PointerToRawData
110 .long 0 @ PointerToRelocations
111 .long 0 @ PointerToLineNumbers
112 .short 0 @ NumberOfRelocations
113 .short 0 @ NumberOfLineNumbers
114 .long 0x42100040 @ Characteristics
115
116 .ascii ".text\0\0\0"
117 .long _end - __efi_start @ VirtualSize
118 .long __efi_start @ VirtualAddress
119 .long _edata - __efi_start @ SizeOfRawData
120 .long __efi_start @ PointerToRawData
121 .long 0 @ PointerToRelocations
122 .long 0 @ PointerToLineNumbers
123 .short 0 @ NumberOfRelocations
124 .short 0 @ NumberOfLineNumbers
125 .long 0xe0500020 @ Characteristics
126
127 .align 9
128__efi_start:
129#endif
130 .endm