protected static void Align(ImageWriter strtab)
{
while (strtab.Position % 4 != 0)
{
strtab.WriteByte(0);
}
}
protected void BuildObjectFile32(bool big_endian)
{
// Add symbol table
if (symbols.Count > 0)
{
Given_Section(".symtab", SectionHeaderType.SHT_SYMTAB, ElfLoader.SHF_ALLOC, FlattenSymbolTable(big_endian));
var os = objectSections[objectSections.Count - 1];
os.ElementSize = Elf32_Sym.Size;
os.Link = (ushort)objectSections.Count;
Given_Section(".strtab", SectionHeaderType.SHT_STRTAB, ElfLoader.SHF_ALLOC, symbolStringtab.ToArray());
}
ImageWriter bin = big_endian ? new BeImageWriter() : (ImageWriter) new LeImageWriter();
bin.WriteByte(0x7F);
bin.WriteBytes(new byte[] { 0x45, 0x4C, 0x46 });
bin.WriteByte(1); // 32-bit
bin.WriteByte(big_endian ? ElfLoader.ELFDATA2MSB : ElfLoader.ELFDATA2LSB);
bin.WriteByte(1); // ELF version
bin.WriteByte(0); // OS ABI
bin.WriteByte(0); // OS version
bin.WriteBytes(0, 7); // pad
// ELF header
bin.WriteUInt16(1); // relocatable
bin.WriteUInt16((ushort)ElfMachine.EM_SPARC);
bin.WriteUInt32(1); // version
bin.WriteUInt32(0); // entry point (none in reloc file)
bin.WriteUInt32(0); // program segment table offset (none in reloc file)
bin.WriteUInt32((uint)bin.Position + 20); // point to section table.
bin.WriteUInt32(0); // e_flags;
bin.WriteUInt16(0); // e_ehsize;
bin.WriteUInt16((ushort)Elf32_PHdr.Size); // e_phentsize;
bin.WriteUInt16((ushort)progHeaders.Count); // e_phnum;
bin.WriteUInt16(0); // e_shentsize;
bin.WriteUInt16((ushort)objectSections.Count); // e_shnum;
bin.WriteUInt16(1); // e_shstrndx;
// Build string table.
var strtab = new MemoryStream();
var mpOsToiName = new Dictionary <ObjectSection, int>();
foreach (var os in this.objectSections)
{
mpOsToiName[os] = (int)strtab.Position;
var bytes = Encoding.ASCII.GetBytes(os.Name);
strtab.Write(bytes, 0, bytes.Length);
strtab.WriteByte(0);
}
// Reserve space for program header table and
// section table.
var iProgHdrTable = (uint)bin.Position;
var iShTable = (uint)bin.Position + (uint)(progHeaders.Count * Elf32_PHdr.Size);
var iStrTable = iShTable + (uint)(40 * objectSections.Count);
// Write string table
var aStrtable = strtab.ToArray();
objectSections[1].Content = aStrtable;
var iContent = iStrTable;
// Place remaining sections.
foreach (var section in objectSections.Skip(1))
{
section.Offset = iContent;
iContent = Align((uint)(iContent + section.Content.Length));
}
// Write the program header table
foreach (var ph in this.progHeaders)
{
bin.WriteUInt32((uint)ph.Type);
bin.WriteUInt32(ph.Offset);
bin.WriteUInt32(ph.VirtualAddress);
bin.WriteUInt32(0);
bin.WriteUInt32((uint)ph.Content.Length);
bin.WriteUInt32(ph.AllocateSize);
bin.WriteUInt32(ph.Flags);
bin.WriteUInt32(ph.Alignment);
}
// Write the section table.
foreach (var os in this.objectSections)
{
bin.WriteUInt32((uint)mpOsToiName[os]);
bin.WriteUInt32((uint)os.Type);
bin.WriteUInt32(os.Flags);
bin.WriteUInt32(0);
bin.WriteUInt32(os.Offset);
bin.WriteUInt32(os.Content != null ? (uint)os.Content.Length : 0u);
bin.WriteUInt32(os.Link);
bin.WriteUInt32(0);
bin.WriteUInt32(0);
bin.WriteUInt32(os.ElementSize);
}
// write the non-null sections.
foreach (var section in objectSections.Skip(1))
{
bin.WriteBytes(section.Content);
Align(bin);
}
this.rawBytes = bin.ToArray();
}