private IntPtr MakeHookStub(MemoryBuffer buffer, IcedPatcher patcher, byte[] asmCode, byte[] originalCode, long jumpBackAddress, AsmHookBehaviour behaviour)
{
var bytes = new List <byte>(asmCode.Length + originalCode.Length);
var jmpBackBytes = Utilities.AssembleAbsoluteJump((IntPtr)jumpBackAddress, _is64Bit);
switch (behaviour)
{
case AsmHookBehaviour.ExecuteFirst:
bytes.AddRange(asmCode);
bytes.AddRange(patcher.EncodeForNewAddress(buffer.Properties.WritePointer + bytes.Count));
break;
case AsmHookBehaviour.ExecuteAfter:
bytes.AddRange(patcher.EncodeForNewAddress(buffer.Properties.WritePointer + bytes.Count));
bytes.AddRange(asmCode);
break;
case AsmHookBehaviour.DoNotExecuteOriginal:
bytes.AddRange(asmCode);
break;
default:
throw new ArgumentOutOfRangeException(nameof(behaviour), behaviour, null);
}
bytes.AddRange(jmpBackBytes);
return(buffer.Add(bytes.ToArray(), 1)); // Buffer is pre-aligned
}
private IntPtr MakeOriginalStub(MemoryBuffer buffer, IcedPatcher patcher, byte[] originalCode, long jumpBackAddress)
{
var bytes = new List <byte>(originalCode.Length);
var jmpBackBytes = Utilities.AssembleAbsoluteJump((IntPtr)jumpBackAddress, _is64Bit);
bytes.AddRange(patcher.EncodeForNewAddress(buffer.Properties.WritePointer));
bytes.AddRange(jmpBackBytes);
return(buffer.Add(bytes.ToArray(), 1)); // Buffer is pre-aligned
}
private nuint MakeOriginalStub(MemoryBuffer buffer, IcedPatcher patcher, byte[] originalCode, nuint jumpBackAddress)
{
var bytes = new List <byte>(originalCode.Length);
bytes.AddRange(patcher.EncodeForNewAddress(buffer.Properties.WritePointer));
var jmpBackBytes = Utilities.AssembleRelativeJump(buffer.Properties.WritePointer + (nuint)bytes.Count, jumpBackAddress, _is64Bit);
bytes.AddRange(jmpBackBytes);
return(buffer.Add(bytes.ToArray(), 1)); // Buffer is pre-aligned
}