1/* SPDX-License-Identifier: GPL-2.0+ OR BSD-2-Clause */
2/*
3 * crt0-efi-aarch64.S - PE/COFF header for aarch64 EFI applications
4 *
5 * Copright (C) 2014 Linaro Ltd. <ard.biesheuvel@linaro.org>
6 *
7 *
8 * This file is taken and modified from the gnu-efi project.
9 */
10
11#include <asm-generic/pe.h>
12
13	.section	.text.head
14
15	/*
16	 * Magic "MZ" signature for PE/COFF
17	 */
18	.globl	ImageBase
19ImageBase:
20	.short	IMAGE_DOS_SIGNATURE		/* 'MZ' */
21	.skip	54				/* 'MZ' + pad + offset == 64 */
22	.long   LINUX_ARM64_MAGIC		/* For GRUB's linux command */
23	.long	pe_header - ImageBase		/* Offset to the PE header */
24pe_header:
25	.long	IMAGE_NT_SIGNATURE		/* 'PE' */
26coff_header:
27	.short	IMAGE_FILE_MACHINE_ARM64	/* AArch64 */
28	.short	3				/* nr_sections */
29	.long	0				/* TimeDateStamp */
30	.long	0				/* PointerToSymbolTable */
31	.long	0				/* NumberOfSymbols */
32	.short	section_table - optional_header	/* SizeOfOptionalHeader */
33	/* Characteristics */
34	.short	(IMAGE_FILE_EXECUTABLE_IMAGE | \
35		 IMAGE_FILE_LINE_NUMS_STRIPPED | \
36		 IMAGE_FILE_LOCAL_SYMS_STRIPPED | \
37		 IMAGE_FILE_LARGE_ADDRESS_AWARE | \
38		 IMAGE_FILE_DEBUG_STRIPPED)
39optional_header:
40	.short	IMAGE_NT_OPTIONAL_HDR64_MAGIC	/* PE32+ format */
41	.byte	0x02				/* MajorLinkerVersion */
42	.byte	0x14				/* MinorLinkerVersion */
43	.long	_etext - _start			/* SizeOfCode */
44	.long	0				/* SizeOfInitializedData */
45	.long	0				/* SizeOfUninitializedData */
46	.long	_start - ImageBase		/* AddressOfEntryPoint */
47	.long	_start - ImageBase		/* BaseOfCode */
48
49extra_header_fields:
50	.quad	0				/* ImageBase */
51	.long	0x1000				/* SectionAlignment */
52	.long	0x200				/* FileAlignment */
53	.short	0				/* MajorOperatingSystemVersion */
54	.short	0				/* MinorOperatingSystemVersion */
55	.short	0				/* MajorImageVersion */
56	.short	0				/* MinorImageVersion */
57	.short	0				/* MajorSubsystemVersion */
58	.short	0				/* MinorSubsystemVersion */
59	.long	0				/* Win32VersionValue */
60
61	.long	_edata - ImageBase		/* SizeOfImage */
62
63	/*
64	 * Everything before the kernel image is considered part of the header
65	 */
66	.long	_start - ImageBase		/* SizeOfHeaders */
67	.long	0				/* CheckSum */
68	.short	IMAGE_SUBSYSTEM_EFI_APPLICATION /* Subsystem */
69	.short	0				/* DllCharacteristics */
70	.quad	0				/* SizeOfStackReserve */
71	.quad	0				/* SizeOfStackCommit */
72	.quad	0				/* SizeOfHeapReserve */
73	.quad	0				/* SizeOfHeapCommit */
74	.long	0				/* LoaderFlags */
75	.long	0x6				/* NumberOfRvaAndSizes */
76
77	.quad	0				/* ExportTable */
78	.quad	0				/* ImportTable */
79	.quad	0				/* ResourceTable */
80	.quad	0				/* ExceptionTable */
81	.quad	0				/* CertificationTable */
82	.quad	0				/* BaseRelocationTable */
83
84	/* Section table */
85section_table:
86
87	/*
88	 * The EFI application loader requires a relocation section
89	 * because EFI applications must be relocatable.  This is a
90	 * dummy section as far as we are concerned.
91	 */
92	.ascii	".reloc"
93	.byte	0
94	.byte	0			/* end of 0 padding of section name */
95	.long	0
96	.long	0
97	.long	0			/* SizeOfRawData */
98	.long	0			/* PointerToRawData */
99	.long	0			/* PointerToRelocations */
100	.long	0			/* PointerToLineNumbers */
101	.short	0			/* NumberOfRelocations */
102	.short	0			/* NumberOfLineNumbers */
103	/* Characteristics (section flags) */
104	.long	(IMAGE_SCN_MEM_READ | \
105		 IMAGE_SCN_MEM_DISCARDABLE | \
106		 IMAGE_SCN_CNT_INITIALIZED_DATA)
107
108	.ascii	".text"
109	.byte	0
110	.byte	0
111	.byte	0			/* end of 0 padding of section name */
112	.long	_etext - _start		/* VirtualSize */
113	.long	_start - ImageBase	/* VirtualAddress */
114	.long	_etext - _start		/* SizeOfRawData */
115	.long	_start - ImageBase	/* PointerToRawData */
116	.long	0			/* PointerToRelocations */
117	.long	0			/* PointerToLineNumbers */
118	.short	0			/* NumberOfRelocations */
119	.short	0			/* NumberOfLineNumbers */
120	/* Characteristics (section flags) */
121	.long	(IMAGE_SCN_MEM_READ | \
122		 IMAGE_SCN_MEM_EXECUTE | \
123		 IMAGE_SCN_CNT_CODE)
124
125	.ascii	".data"
126	.byte	0
127	.byte	0
128	.byte	0			/* end of 0 padding of section name */
129	.long	_data_size		/* VirtualSize */
130	.long	_data - ImageBase	/* VirtualAddress */
131	.long	_data_size		/* SizeOfRawData */
132	.long	_data - ImageBase	/* PointerToRawData */
133	.long	0			/* PointerToRelocations */
134	.long	0			/* PointerToLineNumbers */
135	.short	0			/* NumberOfRelocations */
136	.short	0			/* NumberOfLineNumbers */
137	/* Characteristics (section flags) */
138	.long	(IMAGE_SCN_MEM_WRITE | \
139		 IMAGE_SCN_MEM_READ | \
140		 IMAGE_SCN_CNT_INITIALIZED_DATA)
141
142	.align		12
143_start:
144	stp		x29, x30, [sp, #-32]!
145	mov		x29, sp
146
147	stp		x0, x1, [sp, #16]
148	adr		x0, ImageBase
149	adrp		x1, _DYNAMIC
150	add		x1, x1, #:lo12:_DYNAMIC
151	bl		_relocate
152	cbnz		x0, 0f
153
154	ldp		x0, x1, [sp, #16]
155	bl		efi_main
156
1570:	ldp		x29, x30, [sp], #32
158	ret
159