1/* SPDX-License-Identifier: GPL-2.0+ OR BSD-2-Clause */ 2/* 3 * crt0-efi-arm.S - PE/COFF header for ARM EFI applications 4 * 5 * Copright (C) 2014 Linaro Ltd. <ard.biesheuvel@linaro.org> 6 * 7 * This file is taken and modified from the gnu-efi project. 8 */ 9 10#include <asm-generic/pe.h> 11 12 .section .text.head 13 14 /* 15 * Magic "MZ" signature for PE/COFF 16 */ 17 .globl image_base 18image_base: 19 .short IMAGE_DOS_SIGNATURE /* 'MZ' */ 20 .skip 58 /* 'MZ' + pad + offset == 64 */ 21 .long pe_header - image_base /* Offset to the PE header */ 22pe_header: 23 .long IMAGE_NT_SIGNATURE /* 'PE' */ 24coff_header: 25 .short IMAGE_FILE_MACHINE_THUMB /* Mixed ARM/Thumb */ 26 .short 2 /* nr_sections */ 27 .long 0 /* TimeDateStamp */ 28 .long 0 /* PointerToSymbolTable */ 29 .long 0 /* NumberOfSymbols */ 30 .short section_table - optional_header /* SizeOfOptionalHeader */ 31 /* Characteristics */ 32 .short (IMAGE_FILE_EXECUTABLE_IMAGE | \ 33 IMAGE_FILE_LINE_NUMS_STRIPPED | \ 34 IMAGE_FILE_LOCAL_SYMS_STRIPPED | \ 35 IMAGE_FILE_32BIT_MACHINE | \ 36 IMAGE_FILE_DEBUG_STRIPPED) 37optional_header: 38 .short IMAGE_NT_OPTIONAL_HDR32_MAGIC /* 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 IMAGE_SUBSYSTEM_EFI_APPLICATION /* 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 adr r1, .L_DYNAMIC 122 ldr r0, [r1] 123 add r1, r0, r1 124 adr r0, image_base 125 bl _relocate 126 teq r0, #0 127 bne 0f 128 129 ldmfd sp, {r0-r1} 130 bl efi_main 131 1320: add sp, sp, #12 133 ldr pc, [sp], #4 134 135.L_DYNAMIC: 136 .word _DYNAMIC - . 137