1/* $NetBSD: crt0-efi-riscv64.S,v 1.1.1.1 2021/09/30 18:50:09 jmcneill Exp $ */ 2 3/* SPDX-License-Identifier: GPL-2.0+ */ 4/* 5 * Copright (C) 2014 Linaro Ltd. <ard.biesheuvel@linaro.org> 6 * Copright (C) 2018 Alexander Graf <agraf@suse.de> 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice and this list of conditions, without modification. 13 * 2. The name of the author may not be used to endorse or promote products 14 * derived from this software without specific prior written permission. 15 * 16 * Alternatively, this software may be distributed under the terms of the 17 * GNU General Public License as published by the Free Software Foundation; 18 * either version 2 of the License, or (at your option) any later version. 19 */ 20 21#ifndef EFI_SUBSYSTEM 22#define EFI_SUBSYSTEM 10 23#endif 24 25 .section .text.head 26 27 /* 28 * Magic "MZ" signature for PE/COFF 29 */ 30 .globl ImageBase 31ImageBase: 32 .ascii "MZ" 33 .skip 58 // 'MZ' + pad + offset == 64 34 .long pe_header - ImageBase // Offset to the PE header. 35pe_header: 36 .ascii "PE" 37 .short 0 38coff_header: 39 .short 0x5064 // riscv64 40 .short 2 // nr_sections 41 .long 0 // TimeDateStamp 42 .long 0 // PointerToSymbolTable 43 .long 0 // NumberOfSymbols 44 .short section_table - optional_header // SizeOfOptionalHeader 45 .short 0x206 // Characteristics. 46 // IMAGE_FILE_DEBUG_STRIPPED | 47 // IMAGE_FILE_EXECUTABLE_IMAGE | 48 // IMAGE_FILE_LINE_NUMS_STRIPPED 49optional_header: 50 .short 0x20b // PE32+ format 51 .byte 0x02 // MajorLinkerVersion 52 .byte 0x14 // MinorLinkerVersion 53 .long _data - _start // SizeOfCode 54 .long _data_size // SizeOfInitializedData 55 .long 0 // SizeOfUninitializedData 56 .long _start - ImageBase // AddressOfEntryPoint 57 .long _start - ImageBase // BaseOfCode 58 59extra_header_fields: 60 .quad 0 // ImageBase 61 .long 0x1000 // SectionAlignment 62 .long 0x200 // FileAlignment 63 .short 0 // MajorOperatingSystemVersion 64 .short 0 // MinorOperatingSystemVersion 65 .short 0 // MajorImageVersion 66 .short 0 // MinorImageVersion 67 .short 0 // MajorSubsystemVersion 68 .short 0 // MinorSubsystemVersion 69 .long 0 // Win32VersionValue 70 71 .long _edata - ImageBase // SizeOfImage 72 73 // Everything before the kernel image is considered part of the header 74 .long _start - ImageBase // SizeOfHeaders 75 .long 0 // CheckSum 76 .short EFI_SUBSYSTEM // Subsystem 77 .short 0 // DllCharacteristics 78 .quad 0 // SizeOfStackReserve 79 .quad 0 // SizeOfStackCommit 80 .quad 0 // SizeOfHeapReserve 81 .quad 0 // SizeOfHeapCommit 82 .long 0 // LoaderFlags 83 .long 0x6 // NumberOfRvaAndSizes 84 85 .quad 0 // ExportTable 86 .quad 0 // ImportTable 87 .quad 0 // ResourceTable 88 .quad 0 // ExceptionTable 89 .quad 0 // CertificationTable 90 .quad 0 // BaseRelocationTable 91 92 // Section table 93section_table: 94 /* 95 * The EFI application loader requires a relocation section 96 * because EFI applications must be relocatable. This is a 97 * dummy section as far as we are concerned. 98 */ 99 .ascii ".reloc\0\0" 100 .long 0 101 .long 0 102 .long 0 // SizeOfRawData 103 .long 0 // PointerToRawData 104 .long 0 // PointerToRelocations 105 .long 0 // PointerToLineNumbers 106 .short 0 // NumberOfRelocations 107 .short 0 // NumberOfLineNumbers 108 .long 0x42100040 // Characteristics (section flags) 109 110 .ascii ".text\0\0\0" 111 .long _edata - _start // VirtualSize 112 .long _start - ImageBase // VirtualAddress 113 .long _edata - _start // SizeOfRawData 114 .long _start - ImageBase // PointerToRawData 115 116 .long 0 // PointerToRelocations (0 for executables) 117 .long 0 // PointerToLineNumbers (0 for executables) 118 .short 0 // NumberOfRelocations (0 for executables) 119 .short 0 // NumberOfLineNumbers (0 for executables) 120 .long 0xe0500020 // Characteristics (section flags) 121 122 .align 12 123 .globl _start 124_start: 125 addi sp, sp, -24 126 sd a0, 0(sp) 127 sd a1, 8(sp) 128 sd ra, 16(sp) 129 lla a0, ImageBase 130 lla a1, _DYNAMIC 131 call _relocate 132 bne a0, zero, 0f 133 ld a1, 8(sp) 134 ld a0, 0(sp) 135 call efi_main 136 ld ra, 16(sp) 1370: addi sp, sp, 24 138 ret 139