summaryrefslogtreecommitdiff
path: root/arch/riscv/lib/crt0_riscv_efi.S
blob: b7b5329e1f788dd51d477825b43c7eac4aadbc69 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
/* SPDX-License-Identifier: GPL-2.0+ */
/*
 * crt0-efi-riscv.S - PE/COFF header for RISC-V EFI applications
 *
 * Copright (C) 2014 Linaro Ltd. <ard.biesheuvel@linaro.org>
 * Copright (C) 2018 Alexander Graf <agraf@suse.de>
 *
 * This file is inspired by arch/arm/lib/crt0_aarch64_efi.S
 */

#include <asm-generic/pe.h>

#if __riscv_xlen == 64
#define SIZE_LONG	8
#define SAVE_LONG(reg, idx)	sd	reg, (idx*SIZE_LONG)(sp)
#define LOAD_LONG(reg, idx)	ld	reg, (idx*SIZE_LONG)(sp)
#define PE_MACHINE	0x5064
#else
#define SIZE_LONG	4
#define SAVE_LONG(reg, idx)	sw	reg, (idx*SIZE_LONG)(sp)
#define LOAD_LONG(reg, idx)	lw	reg, (idx*SIZE_LONG)(sp)
#define PE_MACHINE	0x5032
#endif


	.section	.text.head

	/*
	 * Magic "MZ" signature for PE/COFF
	 */
	.globl	ImageBase
ImageBase:
	.ascii	"MZ"
	.skip	58				/* 'MZ' + pad + offset == 64 */
	.long	pe_header - ImageBase		/* Offset to the PE header */
pe_header:
	.ascii	"PE"
	.short	0
coff_header:
	.short	PE_MACHINE			/* RISC-V 64/32-bit */
	.short	2				/* nr_sections */
	.long	0				/* TimeDateStamp */
	.long	0				/* PointerToSymbolTable */
	.long	0				/* NumberOfSymbols */
	.short	section_table - optional_header	/* SizeOfOptionalHeader */
	/* Characteristics */
	.short	(IMAGE_FILE_EXECUTABLE_IMAGE | \
		 IMAGE_FILE_LINE_NUMS_STRIPPED | \
		 IMAGE_FILE_LOCAL_SYMS_STRIPPED | \
		 IMAGE_FILE_DEBUG_STRIPPED)
optional_header:
	.short	0x20b				/* PE32+ format */
	.byte	0x02				/* MajorLinkerVersion */
	.byte	0x14				/* MinorLinkerVersion */
	.long	_edata - _start			/* SizeOfCode */
	.long	0				/* SizeOfInitializedData */
	.long	0				/* SizeOfUninitializedData */
	.long	_start - ImageBase		/* AddressOfEntryPoint */
	.long	_start - ImageBase		/* BaseOfCode */

extra_header_fields:
	.quad	0				/* ImageBase */
	.long	0x20				/* SectionAlignment */
	.long	0x8				/* FileAlignment */
	.short	0				/* MajorOperatingSystemVersion */
	.short	0				/* MinorOperatingSystemVersion */
	.short	0				/* MajorImageVersion */
	.short	0				/* MinorImageVersion */
	.short	0				/* MajorSubsystemVersion */
	.short	0				/* MinorSubsystemVersion */
	.long	0				/* Win32VersionValue */

	.long	_edata - ImageBase		/* SizeOfImage */

	/*
	 * Everything before the kernel image is considered part of the header
	 */
	.long	_start - ImageBase		/* SizeOfHeaders */
	.long	0				/* CheckSum */
	.short	IMAGE_SUBSYSTEM_EFI_APPLICATION /* Subsystem */
	.short	0				/* DllCharacteristics */
	.quad	0				/* SizeOfStackReserve */
	.quad	0				/* SizeOfStackCommit */
	.quad	0				/* SizeOfHeapReserve */
	.quad	0				/* SizeOfHeapCommit */
	.long	0				/* LoaderFlags */
	.long	0x6				/* NumberOfRvaAndSizes */

	.quad	0				/* ExportTable */
	.quad	0				/* ImportTable */
	.quad	0				/* ResourceTable */
	.quad	0				/* ExceptionTable */
	.quad	0				/* CertificationTable */
	.quad	0				/* BaseRelocationTable */

	/* Section table */
section_table:

	/*
	 * The EFI application loader requires a relocation section
	 * because EFI applications must be relocatable.  This is a
	 * dummy section as far as we are concerned.
	 */
	.ascii	".reloc"
	.byte	0
	.byte	0			/* end of 0 padding of section name */
	.long	0
	.long	0
	.long	0			/* SizeOfRawData */
	.long	0			/* PointerToRawData */
	.long	0			/* PointerToRelocations */
	.long	0			/* PointerToLineNumbers */
	.short	0			/* NumberOfRelocations */
	.short	0			/* NumberOfLineNumbers */
	.long	0x42100040		/* Characteristics (section flags) */


	.ascii	".text"
	.byte	0
	.byte	0
	.byte	0			/* end of 0 padding of section name */
	.long	_edata - _start		/* VirtualSize */
	.long	_start - ImageBase	/* VirtualAddress */
	.long	_edata - _start		/* SizeOfRawData */
	.long	_start - ImageBase	/* PointerToRawData */

	.long	0		/* PointerToRelocations (0 for executables) */
	.long	0		/* PointerToLineNumbers (0 for executables) */
	.short	0		/* NumberOfRelocations  (0 for executables) */
	.short	0		/* NumberOfLineNumbers  (0 for executables) */
	.long	0xe0500020	/* Characteristics (section flags) */

_start:
	addi		sp, sp, -(SIZE_LONG * 3)
	SAVE_LONG(a0, 0)
	SAVE_LONG(a1, 1)
	SAVE_LONG(ra, 2)

	lla		a0, ImageBase
	lla		a1, _DYNAMIC
	call		_relocate
	bne		a0, zero, 0f

	LOAD_LONG(a1, 1)
	LOAD_LONG(a0, 0)
	call		efi_main

	LOAD_LONG(ra, 2)

0:	addi		sp, sp, (SIZE_LONG * 3)
	ret