public void SimpleCodeSectionAndSymbolSection()
{
var elf = new ElfObjectFile();
var codeStream = new MemoryStream();
codeStream.Write(Encoding.UTF8.GetBytes("This is a text"));
codeStream.Position = 0;
var codeSection = new ElfCustomSection(codeStream).ConfigureAs(ElfSectionSpecialType.Text);
elf.AddSection(codeSection);
var stringSection = new ElfStringTable();
elf.AddSection(stringSection);
var symbolSection = new ElfSymbolTable()
{
Link = stringSection,
Entries =
{
new ElfSymbol()
{
Name = "local_symbol",
Bind = ElfSymbolBind.Local,
Section = codeSection,
Size = 16,
Type = ElfSymbolType.Function,
Visibility = ElfSymbolVisibility.Protected,
Value = 0x7896
},
new ElfSymbol()
{
Name = "GlobalSymbol",
Bind = ElfSymbolBind.Global,
Section = codeSection,
Size = 4,
Type = ElfSymbolType.Function,
Value = 0x12345
}
}
};
elf.AddSection(symbolSection);
elf.AddSection(new ElfSectionHeaderStringTable());
AssertReadElf(elf, "test2.elf");
}
public void SimpleCodeSection()
{
var elf = new ElfObjectFile();
var codeStream = new MemoryStream();
codeStream.Write(Encoding.UTF8.GetBytes("This is a text"));
codeStream.Position = 0;
var codeSection = new ElfCustomSection(codeStream).ConfigureAs(ElfSectionSpecialType.Text);
elf.AddSection(codeSection);
elf.AddSection(new ElfSectionHeaderStringTable());
AssertReadElf(elf, "test.elf");
}
public void SimpleProgramHeaderAndCodeSectionAndSymbolSectionAndRelocation()
{
var arch = ElfArch.X86_64;
var elf = new ElfObjectFile();
var codeStream = new MemoryStream();
codeStream.Write(new byte[4096]);
var codeSection = elf.AddSection(
new ElfCustomSection(codeStream)
{
VirtualAddress = 0x1000,
Alignment = 4096
}.ConfigureAs(ElfSectionSpecialType.Text)
);
var dataStream = new MemoryStream();
dataStream.Write(new byte[1024]);
var dataSection = elf.AddSection(
new ElfCustomSection(dataStream)
{
VirtualAddress = 0x2000,
Alignment = 4096
}.ConfigureAs(ElfSectionSpecialType.ReadOnlyData)
);
var stringSection = elf.AddSection(new ElfStringTable());
var symbolSection = elf.AddSection(
new ElfSymbolTable()
{
Link = stringSection,
Entries =
{
new ElfSymbol()
{
Name = "local_symbol",
Bind = ElfSymbolBind.Local,
Section = codeSection,
Size = 16,
Type = ElfSymbolType.Function,
Visibility = ElfSymbolVisibility.Protected,
Value = 0x7896
},
new ElfSymbol()
{
Name = "GlobalSymbol",
Bind = ElfSymbolBind.Global,
Section = codeSection,
Size = 4,
Type = ElfSymbolType.Function,
Value = 0x12345
}
}
}
);
elf.AddSegment(
new ElfSegment()
{
Type = ElfSegmentTypeCore.Load,
Range = codeSection,
VirtualAddress = 0x1000,
PhysicalAddress = 0x1000,
Flags = ElfSegmentFlagsCore.Readable | ElfSegmentFlagsCore.Executable,
Size = 4096,
SizeInMemory = 4096,
Alignment = 4096,
}
);
elf.AddSegment(
new ElfSegment()
{
Type = ElfSegmentTypeCore.Load,
Range = dataSection,
VirtualAddress = 0x2000,
PhysicalAddress = 0x2000,
Flags = ElfSegmentFlagsCore.Readable | ElfSegmentFlagsCore.Writable,
Size = 1024,
SizeInMemory = 1024,
Alignment = 4096,
}
);
var relocTable = elf.AddSection(
new ElfRelocationTable
{
Name = ".rela.text",
Link = symbolSection,
Info = codeSection,
Entries =
{
new ElfRelocation()
{
SymbolIndex = 1,
Type = ElfRelocationType.R_X86_64_32,
Offset = 0
},
new ElfRelocation()
{
SymbolIndex = 2,
Type = ElfRelocationType.R_X86_64_8,
Offset = 0
}
}
}
);
elf.AddSection(new ElfSectionHeaderStringTable());
AssertReadElf(elf, "test4.elf");
}
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);
}