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- /* SPDX-License-Identifier: GPL-2.0+ */
- /*
- * crt0-efi-riscv.S - PE/COFF header for RISC-V EFI applications
- *
- * Copright (C) 2014 Linaro Ltd. <ard.biesheuvel@linaro.org>
- * Copright (C) 2018 Alexander Graf <agraf@suse.de>
- *
- * This file is inspired by arch/arm/lib/crt0_aarch64_efi.S
- */
- #include <asm-generic/pe.h>
- #if __riscv_xlen == 64
- #define SIZE_LONG 8
- #define SAVE_LONG(reg, idx) sd reg, (idx*SIZE_LONG)(sp)
- #define LOAD_LONG(reg, idx) ld reg, (idx*SIZE_LONG)(sp)
- #define PE_MACHINE IMAGE_FILE_MACHINE_RISCV64
- #define PE_MAGIC IMAGE_NT_OPTIONAL_HDR64_MAGIC
- #else
- #define SIZE_LONG 4
- #define SAVE_LONG(reg, idx) sw reg, (idx*SIZE_LONG)(sp)
- #define LOAD_LONG(reg, idx) lw reg, (idx*SIZE_LONG)(sp)
- #define PE_MACHINE IMAGE_FILE_MACHINE_RISCV32
- #define PE_MAGIC IMAGE_NT_OPTIONAL_HDR32_MAGIC
- #endif
- .section .text.head
- /*
- * Magic "MZ" signature for PE/COFF
- */
- .globl ImageBase
- ImageBase:
- .short IMAGE_DOS_SIGNATURE /* 'MZ' */
- .skip 46 /* 'MZ' + pad + offset == 64 */
- .long 0x43534952 /* Linux magic "RISCV */
- .long 0x00000056
- .long 0x05435352 /* Linux magic2 "RSC\x05*/
- .long pe_header - ImageBase /* Offset to the PE header */
- pe_header:
- .long IMAGE_NT_SIGNATURE /* 'PE' */
- coff_header:
- .short PE_MACHINE /* RISC-V 64/32-bit */
- .short 2 /* nr_sections */
- .long 0 /* TimeDateStamp */
- .long 0 /* PointerToSymbolTable */
- .long 0 /* NumberOfSymbols */
- .short section_table - optional_header /* SizeOfOptionalHeader */
- /* Characteristics */
- .short (IMAGE_FILE_EXECUTABLE_IMAGE | \
- IMAGE_FILE_LINE_NUMS_STRIPPED | \
- IMAGE_FILE_LOCAL_SYMS_STRIPPED | \
- IMAGE_FILE_DEBUG_STRIPPED)
- optional_header:
- .short PE_MAGIC /* PE32(+) format */
- .byte 0x02 /* MajorLinkerVersion */
- .byte 0x14 /* MinorLinkerVersion */
- .long _edata - _start /* SizeOfCode */
- .long 0 /* SizeOfInitializedData */
- .long 0 /* SizeOfUninitializedData */
- .long _start - ImageBase /* AddressOfEntryPoint */
- .long _start - ImageBase /* BaseOfCode */
- #if __riscv_xlen == 32
- .long 0 /* BaseOfData */
- #endif
- extra_header_fields:
- #if __riscv_xlen == 32
- .long 0 /* ImageBase */
- #else
- .quad 0 /* ImageBase */
- #endif
- .long 0x20 /* SectionAlignment */
- .long 0x8 /* FileAlignment */
- .short 0 /* MajorOperatingSystemVersion */
- .short 0 /* MinorOperatingSystemVersion */
- .short 1 /* MajorImageVersion */
- .short 0 /* MinorImageVersion */
- .short 0 /* MajorSubsystemVersion */
- .short 0 /* MinorSubsystemVersion */
- .long 0 /* Win32VersionValue */
- .long _edata - ImageBase /* SizeOfImage */
- /*
- * Everything before the kernel image is considered part of the header
- */
- .long _start - ImageBase /* SizeOfHeaders */
- .long 0 /* CheckSum */
- .short IMAGE_SUBSYSTEM_EFI_APPLICATION /* Subsystem */
- .short 0 /* DllCharacteristics */
- #if __riscv_xlen == 32
- .long 0 /* SizeOfStackReserve */
- .long 0 /* SizeOfStackCommit */
- .long 0 /* SizeOfHeapReserve */
- .long 0 /* SizeOfHeapCommit */
- #else
- .quad 0 /* SizeOfStackReserve */
- .quad 0 /* SizeOfStackCommit */
- .quad 0 /* SizeOfHeapReserve */
- .quad 0 /* SizeOfHeapCommit */
- #endif
- .long 0 /* LoaderFlags */
- .long 0x6 /* NumberOfRvaAndSizes */
- .quad 0 /* ExportTable */
- .quad 0 /* ImportTable */
- .quad 0 /* ResourceTable */
- .quad 0 /* ExceptionTable */
- .quad 0 /* CertificationTable */
- .quad 0 /* BaseRelocationTable */
- .quad 0 /* Debug */
- .quad 0 /* Architecture */
- .quad 0 /* Global Ptr */
- .quad 0 /* TLS Table */
- .quad 0 /* Load Config Table */
- .quad 0 /* Bound Import */
- .quad 0 /* IAT */
- .quad 0 /* Delay Import Descriptor */
- .quad 0 /* CLR Runtime Header */
- .quad 0 /* Reserved */
- /* Section table */
- section_table:
- /*
- * The EFI application loader requires a relocation section
- * because EFI applications must be relocatable. This is a
- * dummy section as far as we are concerned.
- */
- .ascii ".reloc"
- .byte 0
- .byte 0 /* end of 0 padding of section name */
- .long 0
- .long 0
- .long 0 /* SizeOfRawData */
- .long 0 /* PointerToRawData */
- .long 0 /* PointerToRelocations */
- .long 0 /* PointerToLineNumbers */
- .short 0 /* NumberOfRelocations */
- .short 0 /* NumberOfLineNumbers */
- .long 0x42100040 /* Characteristics (section flags) */
- .ascii ".text"
- .byte 0
- .byte 0
- .byte 0 /* end of 0 padding of section name */
- .long _edata - _start /* VirtualSize */
- .long _start - ImageBase /* VirtualAddress */
- .long _edata - _start /* SizeOfRawData */
- .long _start - ImageBase /* PointerToRawData */
- .long 0 /* PointerToRelocations (0 for executables) */
- .long 0 /* PointerToLineNumbers (0 for executables) */
- .short 0 /* NumberOfRelocations (0 for executables) */
- .short 0 /* NumberOfLineNumbers (0 for executables) */
- .long 0xe0500020 /* Characteristics (section flags) */
- _start:
- addi sp, sp, -(SIZE_LONG * 3)
- SAVE_LONG(a0, 0)
- SAVE_LONG(a1, 1)
- SAVE_LONG(ra, 2)
- lla a0, ImageBase
- lla a1, _DYNAMIC
- call _relocate
- bne a0, zero, 0f
- LOAD_LONG(a1, 1)
- LOAD_LONG(a0, 0)
- call efi_main
- LOAD_LONG(ra, 2)
- 0: addi sp, sp, (SIZE_LONG * 3)
- ret
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