| Alexander Graf | 31bdde9 | 2018-04-23 07:59:45 +0200 | [diff] [blame^] | 1 | /* |
| 2 | * crt0-efi-riscv.S - PE/COFF header for RISC-V EFI applications |
| 3 | * |
| 4 | * Copright (C) 2014 Linaro Ltd. <ard.biesheuvel@linaro.org> |
| 5 | * Copright (C) 2018 Alexander Graf <agraf@suse.de> |
| 6 | * |
| 7 | * SPDX-License-Identifier: GPL-2.0+ BSD-2-Clause |
| 8 | * |
| 9 | * This file is inspired by arch/arm/lib/crt0_aarch64_efi.S |
| 10 | */ |
| 11 | |
| 12 | #include <asm-generic/pe.h> |
| 13 | |
| 14 | #if __riscv_xlen == 64 |
| 15 | #define SIZE_LONG 8 |
| 16 | #define SAVE_LONG(reg, idx) sd reg, (idx*SIZE_LONG)(sp) |
| 17 | #define LOAD_LONG(reg, idx) ld reg, (idx*SIZE_LONG)(sp) |
| 18 | #define PE_MACHINE 0x5064 |
| 19 | #else |
| 20 | #define SIZE_LONG 4 |
| 21 | #define SAVE_LONG(reg, idx) sw reg, (idx*SIZE_LONG)(sp) |
| 22 | #define LOAD_LONG(reg, idx) lw reg, (idx*SIZE_LONG)(sp) |
| 23 | #define PE_MACHINE 0x5032 |
| 24 | #endif |
| 25 | |
| 26 | |
| 27 | .section .text.head |
| 28 | |
| 29 | /* |
| 30 | * Magic "MZ" signature for PE/COFF |
| 31 | */ |
| 32 | .globl ImageBase |
| 33 | ImageBase: |
| 34 | .ascii "MZ" |
| 35 | .skip 58 /* 'MZ' + pad + offset == 64 */ |
| 36 | .long pe_header - ImageBase /* Offset to the PE header */ |
| 37 | pe_header: |
| 38 | .ascii "PE" |
| 39 | .short 0 |
| 40 | coff_header: |
| 41 | .short PE_MACHINE /* RISC-V 64/32-bit */ |
| 42 | .short 2 /* nr_sections */ |
| 43 | .long 0 /* TimeDateStamp */ |
| 44 | .long 0 /* PointerToSymbolTable */ |
| 45 | .long 1 /* NumberOfSymbols */ |
| 46 | .short section_table - optional_header /* SizeOfOptionalHeader */ |
| 47 | /* |
| 48 | * Characteristics: IMAGE_FILE_DEBUG_STRIPPED | |
| 49 | * IMAGE_FILE_EXECUTABLE_IMAGE | IMAGE_FILE_LINE_NUMS_STRIPPED |
| 50 | */ |
| 51 | .short 0x206 |
| 52 | optional_header: |
| 53 | .short 0x20b /* PE32+ format */ |
| 54 | .byte 0x02 /* MajorLinkerVersion */ |
| 55 | .byte 0x14 /* MinorLinkerVersion */ |
| 56 | .long _edata - _start /* SizeOfCode */ |
| 57 | .long 0 /* SizeOfInitializedData */ |
| 58 | .long 0 /* SizeOfUninitializedData */ |
| 59 | .long _start - ImageBase /* AddressOfEntryPoint */ |
| 60 | .long _start - ImageBase /* BaseOfCode */ |
| 61 | |
| 62 | extra_header_fields: |
| 63 | .quad 0 /* ImageBase */ |
| 64 | .long 0x20 /* SectionAlignment */ |
| 65 | .long 0x8 /* FileAlignment */ |
| 66 | .short 0 /* MajorOperatingSystemVersion */ |
| 67 | .short 0 /* MinorOperatingSystemVersion */ |
| 68 | .short 0 /* MajorImageVersion */ |
| 69 | .short 0 /* MinorImageVersion */ |
| 70 | .short 0 /* MajorSubsystemVersion */ |
| 71 | .short 0 /* MinorSubsystemVersion */ |
| 72 | .long 0 /* Win32VersionValue */ |
| 73 | |
| 74 | .long _edata - ImageBase /* SizeOfImage */ |
| 75 | |
| 76 | /* |
| 77 | * Everything before the kernel image is considered part of the header |
| 78 | */ |
| 79 | .long _start - ImageBase /* SizeOfHeaders */ |
| 80 | .long 0 /* CheckSum */ |
| 81 | .short IMAGE_SUBSYSTEM_EFI_APPLICATION /* Subsystem */ |
| 82 | .short 0 /* DllCharacteristics */ |
| 83 | .quad 0 /* SizeOfStackReserve */ |
| 84 | .quad 0 /* SizeOfStackCommit */ |
| 85 | .quad 0 /* SizeOfHeapReserve */ |
| 86 | .quad 0 /* SizeOfHeapCommit */ |
| 87 | .long 0 /* LoaderFlags */ |
| 88 | .long 0x6 /* NumberOfRvaAndSizes */ |
| 89 | |
| 90 | .quad 0 /* ExportTable */ |
| 91 | .quad 0 /* ImportTable */ |
| 92 | .quad 0 /* ResourceTable */ |
| 93 | .quad 0 /* ExceptionTable */ |
| 94 | .quad 0 /* CertificationTable */ |
| 95 | .quad 0 /* BaseRelocationTable */ |
| 96 | |
| 97 | /* Section table */ |
| 98 | section_table: |
| 99 | |
| 100 | /* |
| 101 | * The EFI application loader requires a relocation section |
| 102 | * because EFI applications must be relocatable. This is a |
| 103 | * dummy section as far as we are concerned. |
| 104 | */ |
| 105 | .ascii ".reloc" |
| 106 | .byte 0 |
| 107 | .byte 0 /* end of 0 padding of section name */ |
| 108 | .long 0 |
| 109 | .long 0 |
| 110 | .long 0 /* SizeOfRawData */ |
| 111 | .long 0 /* PointerToRawData */ |
| 112 | .long 0 /* PointerToRelocations */ |
| 113 | .long 0 /* PointerToLineNumbers */ |
| 114 | .short 0 /* NumberOfRelocations */ |
| 115 | .short 0 /* NumberOfLineNumbers */ |
| 116 | .long 0x42100040 /* Characteristics (section flags) */ |
| 117 | |
| 118 | |
| 119 | .ascii ".text" |
| 120 | .byte 0 |
| 121 | .byte 0 |
| 122 | .byte 0 /* end of 0 padding of section name */ |
| 123 | .long _edata - _start /* VirtualSize */ |
| 124 | .long _start - ImageBase /* VirtualAddress */ |
| 125 | .long _edata - _start /* SizeOfRawData */ |
| 126 | .long _start - ImageBase /* PointerToRawData */ |
| 127 | |
| 128 | .long 0 /* PointerToRelocations (0 for executables) */ |
| 129 | .long 0 /* PointerToLineNumbers (0 for executables) */ |
| 130 | .short 0 /* NumberOfRelocations (0 for executables) */ |
| 131 | .short 0 /* NumberOfLineNumbers (0 for executables) */ |
| 132 | .long 0xe0500020 /* Characteristics (section flags) */ |
| 133 | |
| 134 | _start: |
| 135 | addi sp, sp, -(SIZE_LONG * 3) |
| 136 | SAVE_LONG(a0, 0) |
| 137 | SAVE_LONG(a1, 1) |
| 138 | SAVE_LONG(ra, 2) |
| 139 | |
| 140 | lla a0, ImageBase |
| 141 | lla a1, _DYNAMIC |
| 142 | call _relocate |
| 143 | bne a0, zero, 0f |
| 144 | |
| 145 | LOAD_LONG(a1, 1) |
| 146 | LOAD_LONG(a0, 0) |
| 147 | call efi_main |
| 148 | |
| 149 | LOAD_LONG(ra, 2) |
| 150 | |
| 151 | 0: addi sp, sp, (SIZE_LONG * 3) |
| 152 | ret |