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 IMAGE_FILE_MACHINE_RISCV64 18#define PE_MAGIC IMAGE_NT_OPTIONAL_HDR64_MAGIC 19#define IMG_CHARACTERISTICS \ 20 (IMAGE_FILE_EXECUTABLE_IMAGE | \ 21 IMAGE_FILE_LINE_NUMS_STRIPPED | \ 22 IMAGE_FILE_LOCAL_SYMS_STRIPPED | \ 23 IMAGE_FILE_LARGE_ADDRESS_AWARE | \ 24 IMAGE_FILE_DEBUG_STRIPPED) 25#else 26#define SIZE_LONG 4 27#define SAVE_LONG(reg, idx) sw reg, (idx*SIZE_LONG)(sp) 28#define LOAD_LONG(reg, idx) lw reg, (idx*SIZE_LONG)(sp) 29#define PE_MACHINE IMAGE_FILE_MACHINE_RISCV32 30#define PE_MAGIC IMAGE_NT_OPTIONAL_HDR32_MAGIC 31#define IMG_CHARACTERISTICS \ 32 (IMAGE_FILE_EXECUTABLE_IMAGE | \ 33 IMAGE_FILE_LINE_NUMS_STRIPPED | \ 34 IMAGE_FILE_LOCAL_SYMS_STRIPPED | \ 35 IMAGE_FILE_DEBUG_STRIPPED) 36#endif 37 38 39 .section .text.head 40 41 /* 42 * Magic "MZ" signature for PE/COFF 43 */ 44 .globl ImageBase 45ImageBase: 46 .short IMAGE_DOS_SIGNATURE /* 'MZ' */ 47 .skip 46 /* 'MZ' + pad + offset == 64 */ 48 .long 0x43534952 /* Linux magic "RISCV */ 49 .long 0x00000056 50 .long 0x05435352 /* Linux magic2 "RSC\x05*/ 51 .long pe_header - ImageBase /* Offset to the PE header */ 52pe_header: 53 .long IMAGE_NT_SIGNATURE /* 'PE' */ 54coff_header: 55 .short PE_MACHINE /* RISC-V 64/32-bit */ 56 .short 3 /* nr_sections */ 57 .long 0 /* TimeDateStamp */ 58 .long 0 /* PointerToSymbolTable */ 59 .long 0 /* NumberOfSymbols */ 60 .short section_table - optional_header /* SizeOfOptionalHeader */ 61 .short IMG_CHARACTERISTICS /* Characteristics */ 62optional_header: 63 .short PE_MAGIC /* PE32(+) format */ 64 .byte 0x02 /* MajorLinkerVersion */ 65 .byte 0x14 /* MinorLinkerVersion */ 66 .long _edata - _start /* SizeOfCode */ 67 .long 0 /* SizeOfInitializedData */ 68 .long 0 /* SizeOfUninitializedData */ 69 .long _start - ImageBase /* AddressOfEntryPoint */ 70 .long _start - ImageBase /* BaseOfCode */ 71#if __riscv_xlen == 32 72 .long 0 /* BaseOfData */ 73#endif 74 75extra_header_fields: 76#if __riscv_xlen == 32 77 .long 0 /* ImageBase */ 78#else 79 .quad 0 /* ImageBase */ 80#endif 81 .long 0x200 /* SectionAlignment */ 82 .long 0x200 /* FileAlignment */ 83 .short 0 /* MajorOperatingSystemVersion */ 84 .short 0 /* MinorOperatingSystemVersion */ 85 .short 1 /* MajorImageVersion */ 86 .short 0 /* MinorImageVersion */ 87 .short 0 /* MajorSubsystemVersion */ 88 .short 0 /* MinorSubsystemVersion */ 89 .long 0 /* Win32VersionValue */ 90 91 .long _edata - ImageBase /* SizeOfImage */ 92 93 /* 94 * Everything before the kernel image is considered part of the header 95 */ 96 .long _start - ImageBase /* SizeOfHeaders */ 97 .long 0 /* CheckSum */ 98 .short IMAGE_SUBSYSTEM_EFI_APPLICATION /* Subsystem */ 99#if CONFIG_VENDOR_EFI 100 .short 0 /* DllCharacteristics */ 101#else 102 .short IMAGE_DLLCHARACTERISTICS_NX_COMPAT 103#endif 104#if __riscv_xlen == 32 105 .long 0 /* SizeOfStackReserve */ 106 .long 0 /* SizeOfStackCommit */ 107 .long 0 /* SizeOfHeapReserve */ 108 .long 0 /* SizeOfHeapCommit */ 109#else 110 .quad 0 /* SizeOfStackReserve */ 111 .quad 0 /* SizeOfStackCommit */ 112 .quad 0 /* SizeOfHeapReserve */ 113 .quad 0 /* SizeOfHeapCommit */ 114#endif 115 .long 0 /* LoaderFlags */ 116 .long 0x6 /* NumberOfRvaAndSizes */ 117 118 .quad 0 /* ExportTable */ 119 .quad 0 /* ImportTable */ 120 .quad 0 /* ResourceTable */ 121 .quad 0 /* ExceptionTable */ 122 .quad 0 /* CertificationTable */ 123 .quad 0 /* BaseRelocationTable */ 124 125 /* Section table */ 126section_table: 127 128 /* 129 * The EFI application loader requires a relocation section 130 * because EFI applications must be relocatable. This is a 131 * dummy section as far as we are concerned. 132 */ 133 .ascii ".reloc" 134 .byte 0 135 .byte 0 /* end of 0 padding of section name */ 136 .long 0 137 .long 0 138 .long 0 /* SizeOfRawData */ 139 .long 0 /* PointerToRawData */ 140 .long 0 /* PointerToRelocations */ 141 .long 0 /* PointerToLineNumbers */ 142 .short 0 /* NumberOfRelocations */ 143 .short 0 /* NumberOfLineNumbers */ 144 .long 0x42100040 /* Characteristics (section flags) */ 145 146 147 .ascii ".text" 148 .byte 0 149 .byte 0 150 .byte 0 /* end of 0 padding of section name */ 151 .long _etext - _start /* VirtualSize */ 152 .long _start - ImageBase /* VirtualAddress */ 153 .long _etext - _start /* SizeOfRawData */ 154 .long _start - ImageBase /* PointerToRawData */ 155 .long 0 /* PointerToRelocations (0 for executables) */ 156 .long 0 /* PointerToLineNumbers (0 for executables) */ 157 .short 0 /* NumberOfRelocations (0 for executables) */ 158 .short 0 /* NumberOfLineNumbers (0 for executables) */ 159 /* Characteristics (section flags) */ 160 .long (IMAGE_SCN_MEM_READ | \ 161 IMAGE_SCN_MEM_EXECUTE | \ 162 IMAGE_SCN_CNT_CODE) 163 164 .ascii ".data" 165 .byte 0 166 .byte 0 167 .byte 0 /* end of 0 padding of section name */ 168 .long _edata - _data /* VirtualSize */ 169 .long _data - ImageBase /* VirtualAddress */ 170 .long _edata - _data /* SizeOfRawData */ 171 .long _data - ImageBase /* PointerToRawData */ 172 .long 0 /* PointerToRelocations */ 173 .long 0 /* PointerToLineNumbers */ 174 .short 0 /* NumberOfRelocations */ 175 .short 0 /* NumberOfLineNumbers */ 176 /* Characteristics (section flags) */ 177 .long (IMAGE_SCN_MEM_WRITE | \ 178 IMAGE_SCN_MEM_READ | \ 179 IMAGE_SCN_CNT_INITIALIZED_DATA) 180 181 .align 12 182_start: 183 addi sp, sp, -(SIZE_LONG * 3) 184 SAVE_LONG(a0, 0) 185 SAVE_LONG(a1, 1) 186 SAVE_LONG(ra, 2) 187 188 lla a0, ImageBase 189 lla a1, _DYNAMIC 190 call _relocate 191 bne a0, zero, 0f 192 193 LOAD_LONG(a1, 1) 194 LOAD_LONG(a0, 0) 195 call efi_main 196 197 LOAD_LONG(ra, 2) 198 1990: addi sp, sp, (SIZE_LONG * 3) 200 ret 201