/// <summary>
/// Initializes a new instance of the <see cref="Elf64Linker"/> class.
/// </summary>
public Elf64Linker()
{
this.sections = new List <LinkerSection>();
// Create the default section set
Elf64Section[] sections = new Elf64Section[(int)SectionKind.Max];
sections[(int)SectionKind.Text] = new Elf64CodeSection();
sections[(int)SectionKind.Data] = new Elf64DataSection();
sections[(int)SectionKind.ROData] = new Elf64RoDataSection();
sections[(int)SectionKind.BSS] = new Elf64BssSection();
this.sections.AddRange(sections);
nullSection = new Elf64NullSection();
stringTableSection = new Elf64StringTableSection();
}
/// <summary>
/// A request to patch already emitted code by storing the calculated virtualAddress value.
/// </summary>
/// <param name="linkType">Type of the link.</param>
/// <param name="methodAddress">The virtual virtualAddress of the method whose code is being patched.</param>
/// <param name="methodOffset">The value to store at the position in code.</param>
/// <param name="methodRelativeBase">The method relative base.</param>
/// <param name="targetAddress">The position in code, where it should be patched.</param>
protected override void ApplyPatch(LinkType linkType, long methodAddress, long methodOffset, long methodRelativeBase, long targetAddress)
{
// Retrieve the text section
Elf64Section text = (Elf64Section)GetSection(SectionKind.Text);
// Calculate the patch offset
long offset = (methodAddress - text.VirtualAddress.ToInt64()) + methodOffset;
if ((linkType & LinkType.KindMask) == LinkType.AbsoluteAddress)
{
// FIXME: Need a .reloc section with a relocation entry if the module is moved in virtual memory
// the runtime loader must patch this link request, we'll fail it until we can do relocations.
//throw new NotSupportedException(@".reloc section not supported.");
}
else
{
// Change the absolute into a relative offset
targetAddress = targetAddress - (methodAddress + methodRelativeBase);
}
// Save the stream position
text.ApplyPatch(offset, linkType, targetAddress);
}
/// <summary>
/// Allocates a symbol of the given name in the specified section.
/// </summary>
/// <param name="section">The executable section to allocate From.</param>
/// <param name="size">The number of bytes to allocate. If zero, indicates an unknown amount of memory is required.</param>
/// <param name="alignment">The alignment. A value of zero indicates the use of a default alignment for the section.</param>
/// <returns>
/// A stream, which can be used to populate the section.
/// </returns>
protected override Stream Allocate(SectionKind section, int size, int alignment)
{
Elf64Section linkerSection = (Elf64Section)GetSection(section);
return(linkerSection.Allocate(size, alignment));
}