public void Save(AsmContext context, Stream stream)
{
var file = new ElfFile();
var writer = new BinaryWriter(stream);
file.Sections.Add(new ElfSection());
AddCode(file, context);
AddData(file, context);
AddFlash(file, context);
AddDebugLine(file, context);
var sectionsStringsIndex = file.AddStringsSection();
const int headerSize = 0x34;
const int segmentsOffset = headerSize;
const int segmentEntrySize = 0x20;
var dataOffset = (uint)(segmentsOffset + file.Segments.Count * segmentEntrySize);
var sectionsOffset = dataOffset + file.Data.Length;
var header = new ElfHeader {
Identification = {
Magic = new[] { (char)0x7f, 'E', 'L', 'F' },
FileClass = ElfFileClass.Elf32,
DataType = ElfDataType.Lsb,
Version = 1,
},
Type = ElfType.Executable,
Machine = 0x53,
Version = 1,
Entry = 0x0,
ProgramHeaderOffset = segmentsOffset,
SectionHeaderOffset = (uint)sectionsOffset,
Flags = 0x84,
ElfHeaderSize = headerSize,
ProgramHeaderEntrySize = segmentEntrySize,
ProgramHeaderCount = (ushort)file.Segments.Count,
SectionHeaderEntrySize = 0x28,
SectionHeaderCount = (ushort)file.Sections.Count,
StringSectionIndex = (ushort)sectionsStringsIndex
};
writer.WriteElf32(header);
foreach (var segment in file.Segments) {
var cloned = segment;
cloned.Offset += dataOffset;
writer.WriteElf32(cloned);
}
writer.Write(file.Data.ToArray());
foreach (var section in file.Sections) {
var cloned = section;
if (section.Type != ElfSectionType.Null) {
cloned.Offset += dataOffset;
}
writer.WriteElf32(cloned);
}
}
public static void WriteElf32(this BinaryWriter writer, ElfHeader header)
{
writer.WriteElf32(header.Identification);
writer.WriteElf32Half((ushort)header.Type);
writer.WriteElf32Half(header.Machine);
writer.WriteElf32Word(header.Version);
writer.WriteElf32Addr(header.Entry);
writer.WriteElf32Off(header.ProgramHeaderOffset);
writer.WriteElf32Off(header.SectionHeaderOffset);
writer.WriteElf32Word(header.Flags);
writer.WriteElf32Half(header.ElfHeaderSize);
writer.WriteElf32Half(header.ProgramHeaderEntrySize);
writer.WriteElf32Half(header.ProgramHeaderCount);
writer.WriteElf32Half(header.SectionHeaderEntrySize);
writer.WriteElf32Half(header.SectionHeaderCount);
writer.WriteElf32Half(header.StringSectionIndex);
}