private void SetupEntry(string library, string entryPoint)
{
if (!libraries.Contains(library))
{
Require.False(entryPoints.Contains(entryPoint));
libraries.Add(library);
mainRegion.WriteNumber(1); //DT_NEEDED
if (!library.EndsWith(".so"))
{
library = "lib" + library.Replace('.', '-') + ".so";
}
mainRegion.WriteNumber(dynstr.Get(library));
}
if (!entryPoints.Contains(entryPoint))
{
entryPoints.Add(entryPoint);
Placeholder p = pltgot.CurrentLocation;
int symbolIndex = dynsym.Write(Placeholder.Null, entryPoint, 16);
plt.Align(16, 0x90); // nop
pltgotEntry.Add(entryPoint, p);
pltEntry.Add(entryPoint, plt.CurrentLocation);
if (plt.Is64Bit)
{
plt.Write(new byte[] { 0xff, 0x25 }); // jmp [rip+imm32]
plt.WritePlaceholderDisplacement32(p);
pltgot.WritePlaceholder(plt.CurrentLocation);
plt.WriteByte(0x68); // push IMMS32
plt.WriteInt32(relocator.AddJumpSlot(p, symbolIndex));
plt.WriteByte(0xe9); // jmp rip+imm32
plt.WritePlaceholderDisplacement32(plt0);
}
else
{
plt.Write(new byte[] { 0xff, 0x25 }); // jmp [imm32]
plt.WritePlaceholder(p);
pltgot.WritePlaceholder(plt.CurrentLocation);
plt.WriteByte(0x68); // push IMMS32
plt.WriteInt32(relocator.AddJumpSlot(p, symbolIndex));
plt.WriteByte(0xe9); // jmp imm32
plt.WritePlaceholder(plt0);
}
}
}
private void WriteProgramHeaders()
{
output.Align(16, 0);
programHeaderTable_fo.SetValue(output.Length);
long phdrfo = output.Length;
//phdr
WriteProgramHeader(6, 4, phdrfo, phdrma, phdrsz, 16);
//interp
WriteProgramHeader(3, 4, interpSection.FileOffset, interpSection.MemoryAddress, interpSection.Length, interpSection.RegionAlignment);
//readonly
// WriteProgramHeader(1, 4, interpSection.FileOffset, interpSection.MemoryAddress, readonlyLength, MaxPageSize);
//fileimage (readonly + executable)
WriteProgramHeader(1, 5, 0, imageBase, fileImageLength, MaxPageSize);
// //executable
// WriteProgramHeader(1, 5, codeSection.FileOffset, codeSection.MemoryAddress, execLength, MaxPageSize);
//readwrite
WriteProgramHeader(1, 6, dataSection.FileOffset, dataSection.MemoryAddress, readWriteLength, MaxPageSize);
//dynamic
WriteProgramHeader(2, 6, dynamicSection.FileOffset, dynamicSection.MemoryAddress, dynamicSection.Length, dynamicSection.RegionAlignment);
}
public Importer(Sections sections)
{
relapltRegion = sections.GetSection(".rela.plt").AllocateRegion();
relocator = new Relocator(relapltRegion);
mainRegion = sections.GetSection(".dynamic").AllocateRegion();
dynstrRegion = sections.GetSection(".dynstr").AllocateRegion();
dynstr = new StringTable();
plt = sections.GetSection(".plt").AllocateRegion();
pltgot = sections.GetSection(".got.plt").AllocateRegion();
dynsym = new DynamicSymbols(sections, dynstr);
dynamicTokenSize = dynsym.Write(mainRegion.CurrentLocation, "_DYNAMIC");
mainRegion.WriteNumber(3); // dt_pltgot
mainRegion.WritePlaceholder(pltgot.BaseLocation);
mainRegion.WriteNumber(4); // dt_hash
mainRegion.WritePlaceholder(dynsym.HashRegion.BaseLocation);
mainRegion.WriteNumber(5); // dt_strtab
mainRegion.WritePlaceholder(dynstrRegion.BaseLocation);
mainRegion.WriteNumber(6); // dt_symtab
mainRegion.WritePlaceholder(dynsym.SymbolRegion.BaseLocation);
mainRegion.WriteNumber(11); // dt_syment
mainRegion.WriteNumber(dynsym.ElementSize);
// mainRegion.WriteNumber(15); // dt_rpath
// mainRegion.WriteNumber(dynstr.Get(".:/lib64:/lib"));
plt0 = plt.CurrentLocation;
pltgot.WriteNumber(0);
if (plt.Is64Bit)
{
plt.Write(new byte[] { 0xff, 0x35 }); // push [rip+imm32]
plt.WritePlaceholderDisplacement32(pltgot.CurrentLocation);
pltgot.WriteNumber(0);
plt.Write(new byte[] { 0xff, 0x25 }); // jmp [rip+imm32]
plt.WritePlaceholderDisplacement32(pltgot.CurrentLocation);
pltgot.WriteNumber(0);
}
else
{
plt.WriteByte(0x68); // push IMM32
plt.WritePlaceholder(pltgot.CurrentLocation);
pltgot.WriteNumber(0);
plt.Write(new byte[] { 0xff, 0x25 }); // jmp [imm32]
plt.WritePlaceholder(pltgot.CurrentLocation);
pltgot.WriteNumber(0);
}
plt.Align(16, 0x90); // nop
}
public override Placeholder AddTextLengthPrefix(string text)
{
if (textData.ContainsKey(text))
{
return(textData[text]);
}
if (textRegion == null)
{
textRegion = AllocateDataRegion();
}
Placeholder result = textRegion.CurrentLocation;
byte[] bytes = (new System.Text.UTF8Encoding()).GetBytes(text);
textRegion.WriteNumber(bytes.Length);
textRegion.Write(bytes);
textRegion.WriteByte(0);
textRegion.Align(16, 0);
textData[text] = result;
return(result);
}
