1/*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2020 Mitchell Horne <mhorne@FreeBSD.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, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 * 27 * $FreeBSD$ 28 */ 29 30 .section .text.head 31 32 /* 33 * Magic "MZ" signature for PE/COFF 34 */ 35 .globl ImageBase 36ImageBase: 37 .ascii "MZ" 38 .skip 58 // 'MZ' + pad + offset == 64 39 .long pe_header - ImageBase // Offset to the PE header. 40pe_header: 41 .ascii "PE" 42 .short 0 43coff_header: 44 .short 0x5064 // RISCV64 45 .short 2 // nr_sections 46 .long 0 // TimeDateStamp 47 .long 0 // PointerToSymbolTable 48 .long 0 // NumberOfSymbols 49 .short section_table - optional_header // SizeOfOptionalHeader 50 .short 0x20e // Characteristics. 51 // IMAGE_FILE_DEBUG_STRIPPED | 52 // IMAGE_FILE_EXECUTABLE_IMAGE | 53 // IMAGE_FILE_LOCAL_SYMS_STRIPPED | 54 // IMAGE_FILE_LINE_NUMS_STRIPPED 55optional_header: 56 .short 0x20b // PE32+ format 57 .byte 0x02 // MajorLinkerVersion 58 .byte 0x14 // MinorLinkerVersion 59 .long _edata - _start // SizeOfCode 60 .long 0 // SizeOfInitializedData 61 .long 0 // SizeOfUninitializedData 62 .long _start - ImageBase // AddressOfEntryPoint 63 .long _start - ImageBase // BaseOfCode 64 65extra_header_fields: 66 .quad 0 // ImageBase 67 .long 32 // SectionAlignment 68 .long 8 // FileAlignment 69 70 .short 0 // MajorOperatingSystemVersion 71 .short 0 // MinorOperatingSystemVersion 72 .short 0 // MajorImageVersion 73 .short 0 // MinorImageVersion 74 .short 0 // MajorSubsystemVersion 75 .short 0 // MinorSubsystemVersion 76 .long 0 // Win32VersionValue 77 78 .long _edata - ImageBase // SizeOfImage 79 80 // Everything before the kernel image is considered part of the header 81 .long _start - ImageBase // SizeOfHeaders 82 .long 0 // CheckSum 83 .short 10 // Subsystem (EFI) 84 .short 0 // DllCharacteristics 85 .quad 0 // SizeOfStackReserve 86 .quad 0 // SizeOfStackCommit 87 .quad 0 // SizeOfHeapReserve 88 .quad 0 // SizeOfHeapCommit 89 .long 0 // LoaderFlags 90 .long 16 // NumberOfRvaAndSizes 91 92 .quad 0 // ExportTable 93 .quad 0 // ImportTable 94 .quad 0 // ResourceTable 95 .quad 0 // ExceptionTable 96 .quad 0 // CertificationTable 97 .quad 0 // BaseRelocationTable 98 .quad 0 // Debug 99 .quad 0 // Architecture 100 .quad 0 // Global Ptr 101 .quad 0 // TLS Table 102 .quad 0 // Load Config Table 103 .quad 0 // Bound Import 104 .quad 0 // IAT 105 .quad 0 // Delay Import Descriptor 106 .quad 0 // CLR Runtime Header 107 .quad 0 // Reserved 108 109 // Section table 110section_table: 111 112 /* 113 * The EFI application loader requires a relocation section 114 * because EFI applications must be relocatable. This is a 115 * dummy section as far as we are concerned. 116 */ 117 .ascii ".reloc" 118 .byte 0 119 .byte 0 // end of 0 padding of section name 120 .long 0 121 .long 0 122 .long 0 // SizeOfRawData 123 .long 0 // PointerToRawData 124 .long 0 // PointerToRelocations 125 .long 0 // PointerToLineNumbers 126 .short 0 // NumberOfRelocations 127 .short 0 // NumberOfLineNumbers 128 .long 0x42100040 // Characteristics (section flags) 129 130 131 .ascii ".text" 132 .byte 0 133 .byte 0 134 .byte 0 // end of 0 padding of section name 135 .long _edata - _start // VirtualSize 136 .long _start - ImageBase // VirtualAddress 137 .long _edata - _start // SizeOfRawData 138 .long _start - ImageBase // PointerToRawData 139 140 .long 0 // PointerToRelocations (0 for executables) 141 .long 0 // PointerToLineNumbers (0 for executables) 142 .short 0 // NumberOfRelocations (0 for executables) 143 .short 0 // NumberOfLineNumbers (0 for executables) 144 .long 0xe0500020 // Characteristics (section flags) 145 146 .globl _start 147_start: 148 /* Save boot parameters to the stack */ 149 addi sp, sp, -24 150 sd a0, 0(sp) 151 sd a1, 8(sp) 152 sd ra, 16(sp) 153 154 /* Run relocation */ 155 lla a0, ImageBase 156 lla a1, _DYNAMIC 157 call efi_relocate 158 bne a0, zero, 0f 159 160 /* Call EFI code */ 161 ld a1, 8(sp) 162 ld a0, 0(sp) 163 call efi_main 164 165 ld ra, 16(sp) 166 1670: addi sp, sp, 24 168 ret 169 170_DYNAMIC: 171 .long 0 172