1/*
2 * crt0-efi-arm.S - PE/COFF header for ARM EFI applications
3 *
4 * Copright (C) 2014 Linaro Ltd. <ard.biesheuvel@linaro.org>
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice and this list of conditions, without modification.
11 * 2. The name of the author may not be used to endorse or promote products
12 *    derived from this software without specific prior written permission.
13 *
14 * Alternatively, this software may be distributed under the terms of the
15 * GNU General Public License as published by the Free Software Foundation;
16 * either version 2 of the License, or (at your option) any later version.
17 */
18
19	.section	.text.head
20
21	/*
22	 * Magic "MZ" signature for PE/COFF
23	 */
24	.globl	ImageBase
25ImageBase:
26	.ascii	"MZ"
27	.skip	58				// 'MZ' + pad + offset == 64
28	.long	pe_header - ImageBase		// Offset to the PE header.
29pe_header:
30	.ascii	"PE"
31	.short 	0
32coff_header:
33	.short	0x1c2				// Mixed ARM/Thumb
34	.short	2				// nr_sections
35	.long	0 				// TimeDateStamp
36	.long	0				// PointerToSymbolTable
37	.long	1				// NumberOfSymbols
38	.short	section_table - optional_header	// SizeOfOptionalHeader
39	.short	0x306				// Characteristics.
40						// IMAGE_FILE_32BIT_MACHINE |
41						// IMAGE_FILE_DEBUG_STRIPPED |
42						// IMAGE_FILE_EXECUTABLE_IMAGE |
43						// IMAGE_FILE_LINE_NUMS_STRIPPED
44optional_header:
45	.short	0x10b				// PE32+ format
46	.byte	0x02				// MajorLinkerVersion
47	.byte	0x14				// MinorLinkerVersion
48	.long	_edata - _start			// SizeOfCode
49	.long	0				// SizeOfInitializedData
50	.long	0				// SizeOfUninitializedData
51	.long	_start - ImageBase		// AddressOfEntryPoint
52	.long	_start - ImageBase		// BaseOfCode
53	.long	0				// BaseOfData
54
55extra_header_fields:
56	.long	0				// ImageBase
57	.long	0x20				// SectionAlignment
58	.long	0x8				// FileAlignment
59	.short	0				// MajorOperatingSystemVersion
60	.short	0				// MinorOperatingSystemVersion
61	.short	0				// MajorImageVersion
62	.short	0				// MinorImageVersion
63	.short	0				// MajorSubsystemVersion
64	.short	0				// MinorSubsystemVersion
65	.long	0				// Win32VersionValue
66
67	.long	_edata - ImageBase		// SizeOfImage
68
69	// Everything before the kernel image is considered part of the header
70	.long	_start - ImageBase		// SizeOfHeaders
71	.long	0				// CheckSum
72	.short	10				// Subsystem (EFI)
73	.short	0				// DllCharacteristics
74	.long	0				// SizeOfStackReserve
75	.long	0				// SizeOfStackCommit
76	.long	0				// SizeOfHeapReserve
77	.long	0				// SizeOfHeapCommit
78	.long	0				// LoaderFlags
79	.long	0x6				// NumberOfRvaAndSizes
80
81	.quad	0				// ExportTable
82	.quad	0				// ImportTable
83	.quad	0				// ResourceTable
84	.quad	0				// ExceptionTable
85	.quad	0				// CertificationTable
86	.quad	0				// BaseRelocationTable
87
88	// Section table
89section_table:
90
91	/*
92	 * The EFI application loader requires a relocation section
93	 * because EFI applications must be relocatable.  This is a
94	 * dummy section as far as we are concerned.
95	 */
96	.ascii	".reloc"
97	.byte	0
98	.byte	0			// end of 0 padding of section name
99	.long	0
100	.long	0
101	.long	0			// SizeOfRawData
102	.long	0			// PointerToRawData
103	.long	0			// PointerToRelocations
104	.long	0			// PointerToLineNumbers
105	.short	0			// NumberOfRelocations
106	.short	0			// NumberOfLineNumbers
107	.long	0x42100040		// Characteristics (section flags)
108
109
110	.ascii	".text"
111	.byte	0
112	.byte	0
113	.byte	0        		// end of 0 padding of section name
114	.long	_edata - _start		// VirtualSize
115	.long	_start - ImageBase	// VirtualAddress
116	.long	_edata - _start		// SizeOfRawData
117	.long	_start - ImageBase	// PointerToRawData
118
119	.long	0		// PointerToRelocations (0 for executables)
120	.long	0		// PointerToLineNumbers (0 for executables)
121	.short	0		// NumberOfRelocations  (0 for executables)
122	.short	0		// NumberOfLineNumbers  (0 for executables)
123	.long	0xe0500020	// Characteristics (section flags)
124
125	.globl _start
126_start:
127	stmfd		sp!, {r0-r2, lr}
128
129	mov		r2, r0
130	mov		r3, r1
131	adr		r1, .L_DYNAMIC
132	ldr		r0, [r1]
133	add		r1, r0, r1
134	adr		r0, ImageBase
135	bl		_relocate
136	teq		r0, #0
137	bne		0f
138
139	ldmfd		sp, {r0-r1}
140	bl		efi_main
141
1420:	add		sp, sp, #12
143	ldr		pc, [sp], #4
144
145.L_DYNAMIC:
146	.word		_DYNAMIC - .
147