1/* 2 * crt0-efi-arm.S - PE/COFF header for ARM EFI applications 3 * 4 * Copright (C) 2014 Linaro Ltd. <ard.biesheuvel@linaro.org> 5 * 6 * SPDX-License-Identifier: GPL-2.0+ BSD-2-Clause 7 * 8 * This file is taken and modified from the gnu-efi project. 9 */ 10 11 .section .text.head 12 13 /* 14 * Magic "MZ" signature for PE/COFF 15 */ 16 .globl image_base 17image_base: 18 .ascii "MZ" 19 .skip 58 /* 'MZ' + pad + offset == 64 */ 20 .long pe_header - image_base /* Offset to the PE header */ 21pe_header: 22 .ascii "PE" 23 .short 0 24coff_header: 25 .short 0x1c2 /* Mixed ARM/Thumb */ 26 .short 2 /* nr_sections */ 27 .long 0 /* TimeDateStamp */ 28 .long 0 /* PointerToSymbolTable */ 29 .long 1 /* NumberOfSymbols */ 30 .short section_table - optional_header /* SizeOfOptionalHeader */ 31 /* 32 * Characteristics: IMAGE_FILE_32BIT_MACHINE | 33 * IMAGE_FILE_DEBUG_STRIPPED | IMAGE_FILE_EXECUTABLE_IMAGE | 34 * IMAGE_FILE_LINE_NUMS_STRIPPED 35 */ 36 .short 0x306 37optional_header: 38 .short 0x10b /* PE32+ format */ 39 .byte 0x02 /* MajorLinkerVersion */ 40 .byte 0x14 /* MinorLinkerVersion */ 41 .long _edata - _start /* SizeOfCode */ 42 .long 0 /* SizeOfInitializedData */ 43 .long 0 /* SizeOfUninitializedData */ 44 .long _start - image_base /* AddressOfEntryPoint */ 45 .long _start - image_base /* BaseOfCode */ 46 .long 0 /* BaseOfData */ 47 48extra_header_fields: 49 .long 0 /* image_base */ 50 .long 0x20 /* SectionAlignment */ 51 .long 0x8 /* FileAlignment */ 52 .short 0 /* MajorOperatingSystemVersion */ 53 .short 0 /* MinorOperatingSystemVersion */ 54 .short 0 /* MajorImageVersion */ 55 .short 0 /* MinorImageVersion */ 56 .short 0 /* MajorSubsystemVersion */ 57 .short 0 /* MinorSubsystemVersion */ 58 .long 0 /* Win32VersionValue */ 59 60 .long _edata - image_base /* SizeOfImage */ 61 62 /* 63 * Everything before the kernel image is considered part of the header 64 */ 65 .long _start - image_base /* SizeOfHeaders */ 66 .long 0 /* CheckSum */ 67 .short EFI_SUBSYSTEM /* Subsystem */ 68 .short 0 /* DllCharacteristics */ 69 .long 0 /* SizeOfStackReserve */ 70 .long 0 /* SizeOfStackCommit */ 71 .long 0 /* SizeOfHeapReserve */ 72 .long 0 /* SizeOfHeapCommit */ 73 .long 0 /* LoaderFlags */ 74 .long 0x6 /* NumberOfRvaAndSizes */ 75 76 .quad 0 /* ExportTable */ 77 .quad 0 /* ImportTable */ 78 .quad 0 /* ResourceTable */ 79 .quad 0 /* ExceptionTable */ 80 .quad 0 /* CertificationTable */ 81 .quad 0 /* BaseRelocationTable */ 82 83section_table: 84 85 /* 86 * The EFI application loader requires a relocation section 87 * because EFI applications must be relocatable. This is a 88 * dummy section as far as we are concerned. 89 */ 90 .ascii ".reloc" 91 .byte 0 92 .byte 0 /* end of 0 padding of section name */ 93 .long 0 94 .long 0 95 .long 0 /* SizeOfRawData */ 96 .long 0 /* PointerToRawData */ 97 .long 0 /* PointerToRelocations */ 98 .long 0 /* PointerToLineNumbers */ 99 .short 0 /* NumberOfRelocations */ 100 .short 0 /* NumberOfLineNumbers */ 101 .long 0x42100040 /* Characteristics (section flags) */ 102 103 .ascii ".text" 104 .byte 0 105 .byte 0 106 .byte 0 /* end of 0 padding of section name */ 107 .long _edata - _start /* VirtualSize */ 108 .long _start - image_base /* VirtualAddress */ 109 .long _edata - _start /* SizeOfRawData */ 110 .long _start - image_base /* PointerToRawData */ 111 112 .long 0 /* PointerToRelocations (0 for executables) */ 113 .long 0 /* PointerToLineNumbers (0 for executables) */ 114 .short 0 /* NumberOfRelocations (0 for executables) */ 115 .short 0 /* NumberOfLineNumbers (0 for executables) */ 116 .long 0xe0500020 /* Characteristics (section flags) */ 117 118_start: 119 stmfd sp!, {r0-r2, lr} 120 121 mov r2, r0 122 mov r3, r1 123 adr r1, .L_DYNAMIC 124 ldr r0, [r1] 125 add r1, r0, r1 126 adr r0, image_base 127 bl _relocate 128 teq r0, #0 129 bne 0f 130 131 ldmfd sp, {r0-r1} 132 bl efi_main 133 1340: add sp, sp, #12 135 ldr pc, [sp], #4 136 137.L_DYNAMIC: 138 .word _DYNAMIC - . 139