private ElfBinarySection GetOrCreateDebugSection(string name, bool createSymbol, out int symbolIndex)
{
var newSection = new ElfBinarySection()
{
Name = name,
Alignment = 1,
Type = ElfSectionType.ProgBits,
Stream = new MemoryStream(),
};
Elf.AddSection(newSection);
symbolIndex = 0;
if (createSymbol && _symbolTable != null)
{
symbolIndex = _symbolTable.Entries.Count;
_symbolTable.Entries.Add(new ElfSymbol()
{
Type = ElfSymbolType.Section,
Section = newSection,
});
}
return(newSection);
}
private ElfRelocationTable GetOrCreateRelocationTable(ElfBinarySection section)
{
var newSection = new ElfRelocationTable()
{
Name = $".rela{section.Name}",
Alignment = (ulong)AddressSize,
Flags = ElfSectionFlags.InfoLink,
Type = ElfSectionType.RelocationAddends,
Info = section,
Link = _symbolTable,
};
Elf.AddSection(newSection);
return(newSection);
}
public void CreateDwarf()
{
// Create ELF object
var elf = new ElfObjectFile(ElfArch.X86_64);
var codeSection = new ElfBinarySection(new MemoryStream(new byte[0x64])).ConfigureAs(ElfSectionSpecialType.Text);
elf.AddSection(codeSection);
var stringSection = new ElfStringTable();
elf.AddSection(stringSection);
elf.AddSection(new ElfSymbolTable()
{
Link = stringSection
});
elf.AddSection(new ElfSectionHeaderStringTable());
var elfDiagnostics = new DiagnosticBag();
elf.UpdateLayout(elfDiagnostics);
Assert.False(elfDiagnostics.HasErrors);
// Create DWARF Object
var dwarfFile = new DwarfFile();
// Create .debug_line information
var fileName = new DwarfFileName()
{
Name = "check1.cpp",
Directory = Environment.CurrentDirectory,
};
var fileName2 = new DwarfFileName()
{
Name = "check2.cpp",
Directory = Environment.CurrentDirectory,
};
// First line table
for (int i = 0; i < 2; i++)
{
var lineTable = new DwarfLineProgramTable();
dwarfFile.LineSection.AddLineProgramTable(lineTable);
lineTable.AddressSize = DwarfAddressSize.Bit64;
lineTable.FileNames.Add(fileName);
lineTable.FileNames.Add(fileName2);
lineTable.AddLineSequence(new DwarfLineSequence()
{
new DwarfLine()
{
File = fileName,
Address = 0,
Column = 1,
Line = 1,
},
new DwarfLine()
{
File = fileName,
Address = 1,
Column = 1,
Line = 2,
}
}
);
// NOTE: doesn't seem to be generated by regular GCC
// (it seems that only one line sequence is usually used)
lineTable.AddLineSequence(new DwarfLineSequence()
{
new DwarfLine()
{
File = fileName2,
Address = 0,
Column = 1,
Line = 1,
},
}
);
}
// Create .debug_info
var rootDIE = new DwarfDIECompileUnit()
{
Name = fileName.Name,
LowPC = 0, // 0 relative to base virtual address
HighPC = (int)codeSection.Size, // default is offset/length after LowPC
CompDir = fileName.Directory,
StmtList = dwarfFile.LineSection.LineTables[0],
};
var subProgram = new DwarfDIESubprogram()
{
Name = "MyFunction",
};
rootDIE.AddChild(subProgram);
var cu = new DwarfCompilationUnit()
{
AddressSize = DwarfAddressSize.Bit64,
Root = rootDIE
};
dwarfFile.InfoSection.AddUnit(cu);
// AddressRange table
dwarfFile.AddressRangeTable.AddressSize = DwarfAddressSize.Bit64;
dwarfFile.AddressRangeTable.Unit = cu;
dwarfFile.AddressRangeTable.Ranges.Add(new DwarfAddressRange(0, 0, codeSection.Size));
// Transfer DWARF To ELF
var dwarfElfContext = new DwarfElfContext(elf);
dwarfFile.WriteToElf(dwarfElfContext);
var outputFileName = "create_dwarf.o";
using (var output = new FileStream(outputFileName, FileMode.Create))
{
elf.Write(output);
}
elf.Print(Console.Out);
Console.WriteLine();
dwarfFile.AbbreviationTable.Print(Console.Out);
Console.WriteLine();
dwarfFile.AddressRangeTable.Print(Console.Out);
Console.WriteLine();
dwarfFile.InfoSection.Print(Console.Out);
Console.WriteLine("ReadBack --debug-dump=rawline");
var readelf = LinuxUtil.ReadElf(outputFileName, "--debug-dump=rawline").TrimEnd();
Console.WriteLine(readelf);
}
