1/* SPDX-License-Identifier: BSD-3-Clause or GPL-2.0-or-later */ 2 3/* 4 * crt0-efi-arm.S - PE/COFF header for ARM EFI applications 5 * 6 * Copyright (C) 2014 Linaro Ltd. <ard.biesheuvel@linaro.org> 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 .section .text.head 22 23 /* 24 * Magic "MZ" signature for PE/COFF 25 */ 26 .globl ImageBase 27ImageBase: 28 .ascii "MZ" 29 .skip 58 // 'MZ' + pad + offset == 64 30 .long pe_header - ImageBase // Offset to the PE header. 31pe_header: 32 .ascii "PE" 33 .short 0 34coff_header: 35 .short 0x1c2 // Mixed ARM/Thumb 36 .short 2 // nr_sections 37 .long 0 // TimeDateStamp 38 .long 0 // PointerToSymbolTable 39 .long 1 // NumberOfSymbols 40 .short section_table - optional_header // SizeOfOptionalHeader 41 .short 0x306 // Characteristics. 42 // IMAGE_FILE_32BIT_MACHINE | 43 // IMAGE_FILE_DEBUG_STRIPPED | 44 // IMAGE_FILE_EXECUTABLE_IMAGE | 45 // IMAGE_FILE_LINE_NUMS_STRIPPED 46optional_header: 47 .short 0x10b // PE32+ format 48 .byte 0x02 // MajorLinkerVersion 49 .byte 0x14 // MinorLinkerVersion 50 .long _edata - _gnuefi_start // SizeOfCode 51 .long 0 // SizeOfInitializedData 52 .long 0 // SizeOfUninitializedData 53 .long _gnuefi_start - ImageBase // AddressOfEntryPoint 54 .long _gnuefi_start - ImageBase // BaseOfCode 55 .long 0 // BaseOfData 56 57extra_header_fields: 58 .long 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 _gnuefi_start - ImageBase // SizeOfHeaders 73 .long 0 // CheckSum 74 .short EFI_SUBSYSTEM // Subsystem 75 .short 0 // DllCharacteristics 76 .long 0 // SizeOfStackReserve 77 .long 0 // SizeOfStackCommit 78 .long 0 // SizeOfHeapReserve 79 .long 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 - _gnuefi_start // VirtualSize 117 .long _gnuefi_start - ImageBase // VirtualAddress 118 .long _edata - _gnuefi_start // SizeOfRawData 119 .long _gnuefi_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_gnuefi_start: 128 stmfd sp!, {r0-r2, lr} 129 130 mov r2, r0 131 mov r3, r1 132 adr r1, .L_DYNAMIC 133 ldr r0, [r1] 134 add r1, r0, r1 135 adr r0, ImageBase 136 bl _relocate 137 teq r0, #0 138 bne 0f 139 140 ldmfd sp, {r0-r1} 141 bl efi_main 142 1430: add sp, sp, #12 144 ldr pc, [sp], #4 145 146.L_DYNAMIC: 147 .word _DYNAMIC - . 148