1/* SPDX-License-Identifier: GPL-2.0+ OR BSD-2-Clause */
2/*
3 * crt0-efi-arm.S - PE/COFF header for ARM EFI applications
4 *
5 * Copright (C) 2014 Linaro Ltd. <ard.biesheuvel@linaro.org>
6 *
7 * This file is taken and modified from the gnu-efi project.
8 */
9
10#include <asm-generic/pe.h>
11
12	.section	.text.head
13
14	/*
15	 * Magic "MZ" signature for PE/COFF
16	 */
17	.globl	image_base
18image_base:
19	.short	IMAGE_DOS_SIGNATURE		/* 'MZ' */
20	.skip	58				/* 'MZ' + pad + offset == 64 */
21	.long	pe_header - image_base		/* Offset to the PE header */
22pe_header:
23	.long	IMAGE_NT_SIGNATURE		/* 'PE' */
24coff_header:
25	.short	IMAGE_FILE_MACHINE_THUMB	/* Mixed ARM/Thumb */
26	.short	2				/* nr_sections */
27	.long	0				/* TimeDateStamp */
28	.long	0				/* PointerToSymbolTable */
29	.long	0				/* NumberOfSymbols */
30	.short	section_table - optional_header	/* SizeOfOptionalHeader */
31	/* Characteristics */
32	.short	(IMAGE_FILE_EXECUTABLE_IMAGE | \
33		 IMAGE_FILE_LINE_NUMS_STRIPPED | \
34		 IMAGE_FILE_LOCAL_SYMS_STRIPPED | \
35		 IMAGE_FILE_32BIT_MACHINE | \
36		 IMAGE_FILE_DEBUG_STRIPPED)
37optional_header:
38	.short	IMAGE_NT_OPTIONAL_HDR32_MAGIC	/* PE32 format */
39	.byte	0x02				/* MajorLinkerVersion */
40	.byte	0x14				/* MinorLinkerVersion */
41	.long	_edata - _start			/* SizeOfCode */
42	.long	0				/* SizeOfInitializedData */
43	.long	0				/* SizeOfUninitializedData */
44	.long	_start - image_base		/* AddressOfEntryPoint */
45	.long	_start - image_base		/* BaseOfCode */
46	.long	0				/* BaseOfData */
47
48extra_header_fields:
49	.long	0				/* image_base */
50	.long	0x20				/* SectionAlignment */
51	.long	0x8				/* FileAlignment */
52	.short	0				/* MajorOperatingSystemVersion */
53	.short	0				/* MinorOperatingSystemVersion */
54	.short	0				/* MajorImageVersion */
55	.short	0				/* MinorImageVersion */
56	.short	0				/* MajorSubsystemVersion */
57	.short	0				/* MinorSubsystemVersion */
58	.long	0				/* Win32VersionValue */
59
60	.long	_edata - image_base		/* SizeOfImage */
61
62	/*
63	 * Everything before the kernel image is considered part of the header
64	 */
65	.long	_start - image_base		/* SizeOfHeaders */
66	.long	0				/* CheckSum */
67	.short	IMAGE_SUBSYSTEM_EFI_APPLICATION	/* Subsystem */
68	.short	0				/* DllCharacteristics */
69	.long	0				/* SizeOfStackReserve */
70	.long	0				/* SizeOfStackCommit */
71	.long	0				/* SizeOfHeapReserve */
72	.long	0				/* SizeOfHeapCommit */
73	.long	0				/* LoaderFlags */
74	.long	0x6				/* NumberOfRvaAndSizes */
75
76	.quad	0				/* ExportTable */
77	.quad	0				/* ImportTable */
78	.quad	0				/* ResourceTable */
79	.quad	0				/* ExceptionTable */
80	.quad	0				/* CertificationTable */
81	.quad	0				/* BaseRelocationTable */
82
83section_table:
84
85	/*
86	 * The EFI application loader requires a relocation section
87	 * because EFI applications must be relocatable.  This is a
88	 * dummy section as far as we are concerned.
89	 */
90	.ascii	".reloc"
91	.byte	0
92	.byte	0			/* end of 0 padding of section name */
93	.long	0
94	.long	0
95	.long	0			/* SizeOfRawData */
96	.long	0			/* PointerToRawData */
97	.long	0			/* PointerToRelocations */
98	.long	0			/* PointerToLineNumbers */
99	.short	0			/* NumberOfRelocations */
100	.short	0			/* NumberOfLineNumbers */
101	.long	0x42100040		/* Characteristics (section flags) */
102
103	.ascii	".text"
104	.byte	0
105	.byte	0
106	.byte	0			/* end of 0 padding of section name */
107	.long	_edata - _start		/* VirtualSize */
108	.long	_start - image_base	/* VirtualAddress */
109	.long	_edata - _start		/* SizeOfRawData */
110	.long	_start - image_base	/* PointerToRawData */
111
112	.long	0		/* PointerToRelocations (0 for executables) */
113	.long	0		/* PointerToLineNumbers (0 for executables) */
114	.short	0		/* NumberOfRelocations  (0 for executables) */
115	.short	0		/* NumberOfLineNumbers  (0 for executables) */
116	.long	0xe0500020	/* Characteristics (section flags) */
117
118_start:
119	stmfd		sp!, {r0-r2, lr}
120
121	adr		r1, .L_DYNAMIC
122	ldr		r0, [r1]
123	add		r1, r0, r1
124	adr		r0, image_base
125	bl		_relocate
126	teq		r0, #0
127	bne		0f
128
129	ldmfd		sp, {r0-r1}
130	bl		efi_main
131
1320:	add		sp, sp, #12
133	ldr		pc, [sp], #4
134
135.L_DYNAMIC:
136	.word		_DYNAMIC - .
137