1/* 2 * crt0-efi-loongarch64.S - PE/COFF header for LoongArch64 EFI applications 3 * 4 * Copyright (C) 2021 Loongson Technology Corporation Limited. <zhoumingtao@loongson.cn> 5 * Copyright (C) 2014 Linaro Ltd. <ard.biesheuvel@linaro.org> 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice and this list of conditions, without modification. 12 * 2. The name of the author may not be used to endorse or promote products 13 * derived from this software without specific prior written permission. 14 * 15 * Alternatively, this software may be distributed under the terms of the 16 * GNU General Public License as published by the Free Software Foundation; 17 * either version 2 of the License, or (at your option) any later version. 18 */ 19 20#ifndef EFI_SUBSYSTEM 21#define EFI_SUBSYSTEM 0xa 22#endif 23 .section .text.head 24 25 /* 26 * Magic "MZ" signature for PE/COFF 27 */ 28 .globl ImageBase 29ImageBase: 30 .ascii "MZ" 31 .skip 58 // 'MZ' + pad + offset == 64 32 .long pe_header - ImageBase // Offset to the PE header. 33pe_header: 34 .ascii "PE" 35 .short 0 36coff_header: 37 .short 0x6264 // loongarch64 little endian 38 .short 2 // nr_sections 39 .long 0 // TimeDateStamp 40 .long 0 // PointerToSymbolTable 41 .long 1 // NumberOfSymbols 42 .short section_table - optional_header // SizeOfOptionalHeader 43 .short 0x206 // Characteristics. 44 // IMAGE_FILE_DEBUG_STRIPPED | 45 // IMAGE_FILE_EXECUTABLE_IMAGE | 46 // IMAGE_FILE_LINE_NUMS_STRIPPED 47optional_header: 48 .short 0x20b // PE32+ format 49 .byte 0x02 // MajorLinkerVersion 50 .byte 0x14 // MinorLinkerVersion 51 .long _edata - _start // SizeOfCode 52 .long 0 // SizeOfInitializedData 53 .long 0 // SizeOfUninitializedData 54 .long _start - ImageBase // AddressOfEntryPoint 55 .long _start - ImageBase // BaseOfCode 56 57extra_header_fields: 58 .quad 0 // ImageBase 59 .long 0x20 // SectionAlignment 60 .long 0x8 // FileAlignment 61 .short 0 // MajorOperatingSystemVersion 62 .short 0 // MinorOperatingSystemVersion 63 .short 0 // MajorImageVersion 64 .short 0 // MinorImageVersion 65 .short 0 // MajorSubsystemVersion 66 .short 0 // MinorSubsystemVersion 67 .long 0 // Win32VersionValue 68 69 .long _edata - ImageBase // SizeOfImage 70 71 // Everything before the kernel image is considered part of the header 72 .long _start - ImageBase // SizeOfHeaders 73 .long 0 // CheckSum 74 .short EFI_SUBSYSTEM // Subsystem 75 .short 0 // DllCharacteristics 76 .quad 0 // SizeOfStackReserve 77 .quad 0 // SizeOfStackCommit 78 .quad 0 // SizeOfHeapReserve 79 .quad 0 // SizeOfHeapCommit 80 .long 0 // LoaderFlags 81 .long 0x6 // NumberOfRvaAndSizes 82 83 .quad 0 // ExportTable 84 .quad 0 // ImportTable 85 .quad 0 // ResourceTable 86 .quad 0 // ExceptionTable 87 .quad 0 // CertificationTable 88 .quad 0 // BaseRelocationTable 89 90 // Section table 91section_table: 92 93 /* 94 * The EFI application loader requires a relocation section 95 * because EFI applications must be relocatable. This is a 96 * dummy section as far as we are concerned. 97 */ 98 .ascii ".reloc" 99 .byte 0 100 .byte 0 // end of 0 padding of section name 101 .long 0 102 .long 0 103 .long 0 // SizeOfRawData 104 .long 0 // PointerToRawData 105 .long 0 // PointerToRelocations 106 .long 0 // PointerToLineNumbers 107 .short 0 // NumberOfRelocations 108 .short 0 // NumberOfLineNumbers 109 .long 0x42100040 // Characteristics (section flags) 110 111 112 .ascii ".text" 113 .byte 0 114 .byte 0 115 .byte 0 // end of 0 padding of section name 116 .long _edata - _start // VirtualSize 117 .long _start - ImageBase // VirtualAddress 118 .long _edata - _start // SizeOfRawData 119 .long _start - ImageBase // PointerToRawData 120 121 .long 0 // PointerToRelocations (0 for executables) 122 .long 0 // PointerToLineNumbers (0 for executables) 123 .short 0 // NumberOfRelocations (0 for executables) 124 .short 0 // NumberOfLineNumbers (0 for executables) 125 .long 0xe0500020 // Characteristics (section flags) 126 127 .align 4 128 129 .globl _start 130 .type _start, @function 131_start: 132 addi.d $sp, $sp, -24 133 st.d $ra, $sp, 0 134 st.d $a0, $sp, 8 135 st.d $a1, $sp, 16 136 137 move $a2, $a0 // a2: ImageHandle 138 move $a3, $a1 // a3: SystemTable 139 la.local $a0, ImageBase // a0: ImageBase 140 la.local $a1, _DYNAMIC // a1: DynamicSection 141 bl _relocate 142 bnez $a0, 0f 143 144 ld.d $a0, $sp, 8 145 ld.d $a1, $sp, 16 146 bl efi_main 147 1480: ld.d $ra, $sp, 0 149 addi.d $sp, $sp, 24 150 jr $ra 151 .end _start 152