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Reorganized elf sections
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This commit is contained in:
Eduard Urbach 2025-06-27 13:15:11 +02:00
parent ce5416bf91
commit abbc4d9ae2
Signed by: akyoto
GPG key ID: 49226B848C78F6C8
3 changed files with 29 additions and 21 deletions
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27
src/elf/AddSections.go
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@ -1,19 +1,15 @@
package elf
import "bytes"
import "strings"
// AddSections adds section headers to the ELF file.
func (elf *ELF) AddSections() {
elf.StringTable = []byte("\000.text\000.shstrtab\000")
stringTableStart := elf.DataHeader.Offset + elf.DataHeader.SizeInFile
sectionHeaderStart := stringTableStart + int64(len(elf.StringTable))
elf.SectionHeaders = []SectionHeader{
{
Type: SectionTypeNULL,
},
{
NameIndex: int32(bytes.Index(elf.StringTable, []byte(".text\000"))),
NameIndex: int32(strings.Index(StringTable, ".text\000")),
Type: SectionTypePROGBITS,
Flags: SectionFlagsAllocate | SectionFlagsExecutable,
VirtualAddress: elf.CodeHeader.VirtualAddress,
@ -22,16 +18,25 @@ func (elf *ELF) AddSections() {
Align: elf.CodeHeader.Align,
},
{
NameIndex: int32(bytes.Index(elf.StringTable, []byte(".shstrtab\000"))),
NameIndex: int32(strings.Index(StringTable, ".rodata\000")),
Type: SectionTypePROGBITS,
Flags: SectionFlagsAllocate,
VirtualAddress: elf.DataHeader.VirtualAddress,
Offset: elf.DataHeader.Offset,
SizeInFile: elf.DataHeader.SizeInFile,
Align: elf.DataHeader.Align,
},
{
NameIndex: int32(strings.Index(StringTable, ".shstrtab\000")),
Type: SectionTypeSTRTAB,
Offset: int64(stringTableStart),
SizeInFile: int64(len(elf.StringTable)),
Offset: int64(StringTableStart),
SizeInFile: int64(len(StringTable)),
Align: 1,
},
}
elf.SectionHeaderEntrySize = SectionHeaderSize
elf.SectionHeaderEntryCount = int16(len(elf.SectionHeaders))
elf.SectionHeaderOffset = int64(sectionHeaderStart)
elf.SectionNameStringTableIndex = 2
elf.SectionHeaderOffset = int64(SectionHeaderStart)
elf.SectionNameStringTableIndex = int16(len(elf.SectionHeaders) - 1)
}

6
src/elf/Constants.go
View file

@ -7,5 +7,9 @@ const (
ArchitectureAMD64 = 0x3E
ArchitectureARM64 = 0xB7
ArchitectureRISCV = 0xF3
HeaderEnd = HeaderSize + ProgramHeaderSize*2
StringTable = "\000.text\000.rodata\000.shstrtab\000"
StringTableStart = ProgramHeaderEnd
SectionHeaderStart = StringTableStart + len(StringTable)
ProgramHeaderEnd = HeaderSize + ProgramHeaderSize*2
HeaderEnd = ProgramHeaderEnd + len(StringTable) + 4*SectionHeaderSize
)

5
src/elf/ELF.go
View file

@ -14,7 +14,6 @@ type ELF struct {
CodeHeader ProgramHeader
DataHeader ProgramHeader
SectionHeaders []SectionHeader
StringTable []byte
}
// Write writes the ELF64 format to the given writer.
@ -70,10 +69,10 @@ func Write(writer io.WriteSeeker, b *build.Build, codeBytes []byte, dataBytes []
binary.Write(writer, binary.LittleEndian, &elf.Header)
binary.Write(writer, binary.LittleEndian, &elf.CodeHeader)
binary.Write(writer, binary.LittleEndian, &elf.DataHeader)
writer.Write([]byte(StringTable))
binary.Write(writer, binary.LittleEndian, &elf.SectionHeaders)
writer.Seek(int64(code.Padding), io.SeekCurrent)
writer.Write(code.Bytes)
writer.Seek(int64(data.Padding), io.SeekCurrent)
writer.Write(data.Bytes)
writer.Write(elf.StringTable)
binary.Write(writer, binary.LittleEndian, &elf.SectionHeaders)
}