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crt0-efi-riscv64.S
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crt0-efi-riscv64.S
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/* SPDX-License-Identifier: GPL-2.0+ OR BSD-2-Clause */
/*
* Copyright (C) 2014 Linaro Ltd. <ard.biesheuvel@linaro.org>
* Copyright (C) 2018 Alexander Graf <agraf@suse.de>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice and this list of conditions, without modification.
* 2. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* Alternatively, this software may be distributed under the terms of the
* GNU General Public License as published by the Free Software Foundation;
* either version 2 of the License, or (at your option) any later version.
*/
.section .text.head
/*
* Magic "MZ" signature for PE/COFF
*/
.globl ImageBase
ImageBase:
.ascii "MZ"
.skip 58 // 'MZ' + pad + offset == 64
.4byte pe_header - ImageBase // Offset to the PE header.
pe_header:
.ascii "PE"
.2byte 0
coff_header:
.2byte 0x5064 // riscv64
.2byte 4 // nr_sections
.4byte 0 // TimeDateStamp
.4byte 0 // PointerToSymbolTable
.4byte 0 // NumberOfSymbols
.2byte section_table - optional_header // SizeOfOptionalHeader
.2byte 0x206 // Characteristics.
// IMAGE_FILE_DEBUG_STRIPPED |
// IMAGE_FILE_EXECUTABLE_IMAGE |
// IMAGE_FILE_LINE_NUMS_STRIPPED
optional_header:
.2byte 0x20b // PE32+ format
.byte 0x02 // MajorLinkerVersion
.byte 0x14 // MinorLinkerVersion
.4byte _text_size - ImageBase // SizeOfCode
.4byte _alldata_size - ImageBase // SizeOfInitializedData
.4byte 0 // SizeOfUninitializedData
.4byte _start - ImageBase // AddressOfEntryPoint
.4byte _text - ImageBase // BaseOfCode
extra_header_fields:
.8byte 0 // ImageBase
.4byte 0x1000 // SectionAlignment
.4byte 0x1000 // FileAlignment
.2byte 0 // MajorOperatingSystemVersion
.2byte 0 // MinorOperatingSystemVersion
.2byte 0 // MajorImageVersion
.2byte 0 // MinorImageVersion
.2byte 0 // MajorSubsystemVersion
.2byte 0 // MinorSubsystemVersion
.4byte 0 // Win32VersionValue
.4byte _image_end - ImageBase // SizeOfImage
// Everything before the kernel image is considered part of the header
.4byte _text - ImageBase // SizeOfHeaders
.4byte 0 // CheckSum
.2byte 0 // Subsystem
.2byte 0 // DllCharacteristics
.8byte 0 // SizeOfStackReserve
.8byte 0 // SizeOfStackCommit
.8byte 0 // SizeOfHeapReserve
.8byte 0 // SizeOfHeapCommit
.4byte 0 // LoaderFlags
.4byte 0x10 // NumberOfRvaAndSizes
.8byte 0 // ExportTable
.8byte 0 // ImportTable
.8byte 0 // ResourceTable
.8byte 0 // ExceptionTable
.8byte 0 // CertificationTable
.4byte _reloc - ImageBase // BaseRelocationTable (VirtualAddress)
.4byte _reloc_vsize - ImageBase // BaseRelocationTable (Size)
.8byte 0 // Debug
.8byte 0 // Architecture
.8byte 0 // Global Ptr
.8byte 0 // TLS Table
.8byte 0 // Load Config Table
.8byte 0 // Bound Import
.8byte 0 // IAT
.8byte 0 // Delay Import Descriptor
.8byte 0 // CLR Runtime Header
.8byte 0 // Reserved, must be zero
// Section table
section_table:
.ascii ".text\0\0\0"
.4byte _text_vsize - ImageBase // VirtualSize
.4byte _text - ImageBase // VirtualAddress
.4byte _text_size - ImageBase // SizeOfRawData
.4byte _text - ImageBase // PointerToRawData
.4byte 0 // PointerToRelocations (0 for executables)
.4byte 0 // PointerToLineNumbers (0 for executables)
.2byte 0 // NumberOfRelocations (0 for executables)
.2byte 0 // NumberOfLineNumbers (0 for executables)
.4byte 0x60000020 // Characteristics (section flags)
/*
* 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\0\0"
.4byte _reloc_vsize - ImageBase // VirtualSize
.4byte _reloc - ImageBase // VirtualAddress
.4byte _reloc_size - ImageBase // SizeOfRawData
.4byte _reloc - ImageBase // PointerToRawData
.4byte 0 // PointerToRelocations
.4byte 0 // PointerToLineNumbers
.2byte 0 // NumberOfRelocations
.2byte 0 // NumberOfLineNumbers
.4byte 0x42000040 // Characteristics (section flags)
.ascii ".data\0\0\0"
.4byte _data_vsize - ImageBase // VirtualSize
.4byte _data - ImageBase // VirtualAddress
.4byte _data_size - ImageBase // SizeOfRawData
.4byte _data - ImageBase // PointerToRawData
.4byte 0 // PointerToRelocations
.4byte 0 // PointerToLineNumbers
.2byte 0 // NumberOfRelocations
.2byte 0 // NumberOfLineNumbers
.4byte 0xC0000040 // Characteristics (section flags)
.ascii ".rodata\0"
.4byte _rodata_vsize - ImageBase // VirtualSize
.4byte _rodata - ImageBase // VirtualAddress
.4byte _rodata_size - ImageBase // SizeOfRawData
.4byte _rodata - ImageBase // PointerToRawData
.4byte 0 // PointerToRelocations
.4byte 0 // PointerToLineNumbers
.2byte 0 // NumberOfRelocations
.2byte 0 // NumberOfLineNumbers
.4byte 0x40000040 // Characteristics (section flags)
.text
.globl _start
.type _start,%function
_start:
addi sp, sp, -24
sd a0, 0(sp)
sd a1, 8(sp)
sd ra, 16(sp)
lla a0, ImageBase
lla a1, _DYNAMIC
call _relocate
bne a0, zero, 0f
ld a1, 8(sp)
ld a0, 0(sp)
call _entry
ld ra, 16(sp)
0: addi sp, sp, 24
ret
// hand-craft a dummy .reloc section so EFI knows it's a relocatable executable:
.data
dummy: .4byte 0
#define IMAGE_REL_ABSOLUTE 0
.section .reloc, "a"
label1:
.4byte dummy-label1 // Page RVA
.4byte 12 // Block Size (2*4+2*2), must be aligned by 32 Bits
.2byte (IMAGE_REL_ABSOLUTE<<12) + 0 // reloc for dummy
.2byte (IMAGE_REL_ABSOLUTE<<12) + 0 // reloc for dummy
#if defined(__ELF__) && defined(__linux__)
.section .note.GNU-stack,"",%progbits
#endif