1/* SPDX-License-Identifier: GPL-2.0+ */ 2/* 3 * crt0-efi-riscv.S - PE/COFF header for RISC-V EFI applications 4 * 5 * Copright (C) 2014 Linaro Ltd. <ard.biesheuvel@linaro.org> 6 * Copright (C) 2018 Alexander Graf <agraf@suse.de> 7 * 8 * This file is inspired by arch/arm/lib/crt0_aarch64_efi.S 9 */ 10 11#include <asm-generic/pe.h> 12 13#if __riscv_xlen == 64 14#define SIZE_LONG 8 15#define SAVE_LONG(reg, idx) sd reg, (idx*SIZE_LONG)(sp) 16#define LOAD_LONG(reg, idx) ld reg, (idx*SIZE_LONG)(sp) 17#define PE_MACHINE 0x5064 18#else 19#define SIZE_LONG 4 20#define SAVE_LONG(reg, idx) sw reg, (idx*SIZE_LONG)(sp) 21#define LOAD_LONG(reg, idx) lw reg, (idx*SIZE_LONG)(sp) 22#define PE_MACHINE 0x5032 23#endif 24 25 26 .section .text.head 27 28 /* 29 * Magic "MZ" signature for PE/COFF 30 */ 31 .globl ImageBase 32ImageBase: 33 .ascii "MZ" 34 .skip 58 /* 'MZ' + pad + offset == 64 */ 35 .long pe_header - ImageBase /* Offset to the PE header */ 36pe_header: 37 .ascii "PE" 38 .short 0 39coff_header: 40 .short PE_MACHINE /* RISC-V 64/32-bit */ 41 .short 2 /* nr_sections */ 42 .long 0 /* TimeDateStamp */ 43 .long 0 /* PointerToSymbolTable */ 44 .long 1 /* NumberOfSymbols */ 45 .short section_table - optional_header /* SizeOfOptionalHeader */ 46 /* 47 * Characteristics: IMAGE_FILE_DEBUG_STRIPPED | 48 * IMAGE_FILE_EXECUTABLE_IMAGE | IMAGE_FILE_LINE_NUMS_STRIPPED 49 */ 50 .short 0x206 51optional_header: 52 .short 0x20b /* PE32+ format */ 53 .byte 0x02 /* MajorLinkerVersion */ 54 .byte 0x14 /* MinorLinkerVersion */ 55 .long _edata - _start /* SizeOfCode */ 56 .long 0 /* SizeOfInitializedData */ 57 .long 0 /* SizeOfUninitializedData */ 58 .long _start - ImageBase /* AddressOfEntryPoint */ 59 .long _start - ImageBase /* BaseOfCode */ 60 61extra_header_fields: 62 .quad 0 /* ImageBase */ 63 .long 0x20 /* SectionAlignment */ 64 .long 0x8 /* FileAlignment */ 65 .short 0 /* MajorOperatingSystemVersion */ 66 .short 0 /* MinorOperatingSystemVersion */ 67 .short 0 /* MajorImageVersion */ 68 .short 0 /* MinorImageVersion */ 69 .short 0 /* MajorSubsystemVersion */ 70 .short 0 /* MinorSubsystemVersion */ 71 .long 0 /* Win32VersionValue */ 72 73 .long _edata - ImageBase /* SizeOfImage */ 74 75 /* 76 * Everything before the kernel image is considered part of the header 77 */ 78 .long _start - ImageBase /* SizeOfHeaders */ 79 .long 0 /* CheckSum */ 80 .short IMAGE_SUBSYSTEM_EFI_APPLICATION /* Subsystem */ 81 .short 0 /* DllCharacteristics */ 82 .quad 0 /* SizeOfStackReserve */ 83 .quad 0 /* SizeOfStackCommit */ 84 .quad 0 /* SizeOfHeapReserve */ 85 .quad 0 /* SizeOfHeapCommit */ 86 .long 0 /* LoaderFlags */ 87 .long 0x6 /* NumberOfRvaAndSizes */ 88 89 .quad 0 /* ExportTable */ 90 .quad 0 /* ImportTable */ 91 .quad 0 /* ResourceTable */ 92 .quad 0 /* ExceptionTable */ 93 .quad 0 /* CertificationTable */ 94 .quad 0 /* BaseRelocationTable */ 95 96 /* Section table */ 97section_table: 98 99 /* 100 * The EFI application loader requires a relocation section 101 * because EFI applications must be relocatable. This is a 102 * dummy section as far as we are concerned. 103 */ 104 .ascii ".reloc" 105 .byte 0 106 .byte 0 /* end of 0 padding of section name */ 107 .long 0 108 .long 0 109 .long 0 /* SizeOfRawData */ 110 .long 0 /* PointerToRawData */ 111 .long 0 /* PointerToRelocations */ 112 .long 0 /* PointerToLineNumbers */ 113 .short 0 /* NumberOfRelocations */ 114 .short 0 /* NumberOfLineNumbers */ 115 .long 0x42100040 /* Characteristics (section flags) */ 116 117 118 .ascii ".text" 119 .byte 0 120 .byte 0 121 .byte 0 /* end of 0 padding of section name */ 122 .long _edata - _start /* VirtualSize */ 123 .long _start - ImageBase /* VirtualAddress */ 124 .long _edata - _start /* SizeOfRawData */ 125 .long _start - ImageBase /* PointerToRawData */ 126 127 .long 0 /* PointerToRelocations (0 for executables) */ 128 .long 0 /* PointerToLineNumbers (0 for executables) */ 129 .short 0 /* NumberOfRelocations (0 for executables) */ 130 .short 0 /* NumberOfLineNumbers (0 for executables) */ 131 .long 0xe0500020 /* Characteristics (section flags) */ 132 133_start: 134 addi sp, sp, -(SIZE_LONG * 3) 135 SAVE_LONG(a0, 0) 136 SAVE_LONG(a1, 1) 137 SAVE_LONG(ra, 2) 138 139 lla a0, ImageBase 140 lla a1, _DYNAMIC 141 call _relocate 142 bne a0, zero, 0f 143 144 LOAD_LONG(a1, 1) 145 LOAD_LONG(a0, 0) 146 call efi_main 147 148 LOAD_LONG(ra, 2) 149 1500: addi sp, sp, (SIZE_LONG * 3) 151 ret 152