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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 58 /* 'MZ' + pad + offset == 64 */
.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 0 /* 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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