1/* SPDX-License-Identifier: BSD-3-Clause or GPL-2.0-or-later */
2
3/*
4 * crt0-efi-arm.S - PE/COFF header for ARM EFI applications
5 *
6 * Copyright (C) 2014 Linaro Ltd. <ard.biesheuvel@linaro.org>
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice and this list of conditions, without modification.
13 * 2. The name of the author may not be used to endorse or promote products
14 *    derived from this software without specific prior written permission.
15 *
16 * Alternatively, this software may be distributed under the terms of the
17 * GNU General Public License as published by the Free Software Foundation;
18 * either version 2 of the License, or (at your option) any later version.
19 */
20
21	.section	.text.head
22
23	/*
24	 * Magic "MZ" signature for PE/COFF
25	 */
26	.globl	ImageBase
27ImageBase:
28	.ascii	"MZ"
29	.skip	58				// 'MZ' + pad + offset == 64
30	.long	pe_header - ImageBase		// Offset to the PE header.
31pe_header:
32	.ascii	"PE"
33	.short 	0
34coff_header:
35	.short	0x1c2				// Mixed ARM/Thumb
36	.short	2				// nr_sections
37	.long	0 				// TimeDateStamp
38	.long	0				// PointerToSymbolTable
39	.long	1				// NumberOfSymbols
40	.short	section_table - optional_header	// SizeOfOptionalHeader
41	.short	0x306				// Characteristics.
42						// IMAGE_FILE_32BIT_MACHINE |
43						// IMAGE_FILE_DEBUG_STRIPPED |
44						// IMAGE_FILE_EXECUTABLE_IMAGE |
45						// IMAGE_FILE_LINE_NUMS_STRIPPED
46optional_header:
47	.short	0x10b				// PE32+ format
48	.byte	0x02				// MajorLinkerVersion
49	.byte	0x14				// MinorLinkerVersion
50	.long	_edata - _gnuefi_start			// SizeOfCode
51	.long	0				// SizeOfInitializedData
52	.long	0				// SizeOfUninitializedData
53	.long	_gnuefi_start - ImageBase		// AddressOfEntryPoint
54	.long	_gnuefi_start - ImageBase		// BaseOfCode
55	.long	0				// BaseOfData
56
57extra_header_fields:
58	.long	0				// ImageBase
59	.long	0x20				// SectionAlignment
60	.long	0x8				// FileAlignment
61	.short	0				// MajorOperatingSystemVersion
62	.short	0				// MinorOperatingSystemVersion
63	.short	0				// MajorImageVersion
64	.short	0				// MinorImageVersion
65	.short	0				// MajorSubsystemVersion
66	.short	0				// MinorSubsystemVersion
67	.long	0				// Win32VersionValue
68
69	.long	_edata - ImageBase		// SizeOfImage
70
71	// Everything before the kernel image is considered part of the header
72	.long	_gnuefi_start - ImageBase		// SizeOfHeaders
73	.long	0				// CheckSum
74	.short	EFI_SUBSYSTEM			// Subsystem
75	.short	0				// DllCharacteristics
76	.long	0				// SizeOfStackReserve
77	.long	0				// SizeOfStackCommit
78	.long	0				// SizeOfHeapReserve
79	.long	0				// SizeOfHeapCommit
80	.long	0				// LoaderFlags
81	.long	0x6				// NumberOfRvaAndSizes
82
83	.quad	0				// ExportTable
84	.quad	0				// ImportTable
85	.quad	0				// ResourceTable
86	.quad	0				// ExceptionTable
87	.quad	0				// CertificationTable
88	.quad	0				// BaseRelocationTable
89
90	// Section table
91section_table:
92
93	/*
94	 * The EFI application loader requires a relocation section
95	 * because EFI applications must be relocatable.  This is a
96	 * dummy section as far as we are concerned.
97	 */
98	.ascii	".reloc"
99	.byte	0
100	.byte	0			// end of 0 padding of section name
101	.long	0
102	.long	0
103	.long	0			// SizeOfRawData
104	.long	0			// PointerToRawData
105	.long	0			// PointerToRelocations
106	.long	0			// PointerToLineNumbers
107	.short	0			// NumberOfRelocations
108	.short	0			// NumberOfLineNumbers
109	.long	0x42100040		// Characteristics (section flags)
110
111
112	.ascii	".text"
113	.byte	0
114	.byte	0
115	.byte	0        		// end of 0 padding of section name
116	.long	_edata - _gnuefi_start		// VirtualSize
117	.long	_gnuefi_start - ImageBase	// VirtualAddress
118	.long	_edata - _gnuefi_start		// SizeOfRawData
119	.long	_gnuefi_start - ImageBase	// PointerToRawData
120
121	.long	0		// PointerToRelocations (0 for executables)
122	.long	0		// PointerToLineNumbers (0 for executables)
123	.short	0		// NumberOfRelocations  (0 for executables)
124	.short	0		// NumberOfLineNumbers  (0 for executables)
125	.long	0xe0500020	// Characteristics (section flags)
126
127_gnuefi_start:
128	stmfd		sp!, {r0-r2, lr}
129
130	mov		r2, r0
131	mov		r3, r1
132	adr		r1, .L_DYNAMIC
133	ldr		r0, [r1]
134	add		r1, r0, r1
135	adr		r0, ImageBase
136	bl		_relocate
137	teq		r0, #0
138	bne		0f
139
140	ldmfd		sp, {r0-r1}
141	bl		efi_main
142
1430:	add		sp, sp, #12
144	ldr		pc, [sp], #4
145
146.L_DYNAMIC:
147	.word		_DYNAMIC - .
148