protected Address ReadSegmentedCodeAddress(int byteSize, ImageReader rdr, ProcessorState state)
{
if (byteSize == PrimitiveType.Word16.Size)
{
return(Address.SegPtr(state.GetRegister(Registers.cs).ToUInt16(), rdr.ReadLeUInt16()));
}
else
{
ushort off = rdr.ReadLeUInt16();
ushort seg = rdr.ReadLeUInt16();
return(Address.SegPtr(seg, off));
}
}
public void BwiX86_WalkX86ServiceCall()
{
// Checks to see if a sequence return value (es:bx) trashes the state appropriately.
BuildTest16(m =>
{
m.Int(0x21);
state.SetRegister(Registers.es, Constant.Word16(0));
state.SetRegister(Registers.bx, Constant.Word16(0));
state.SetRegister(Registers.ah, Constant.Word16(0x2F));
});
wi.Process();
Assert.IsFalse(state.GetRegister(Registers.es).IsValid, "should have trashed ES");
Assert.IsFalse(state.GetRegister(Registers.bx).IsValid, "should have trashed BX");
}
protected bool TryReadSegmentedCodeAddress(int byteSize, EndianImageReader rdr, ProcessorState state, out Address addr)
{
if (byteSize == PrimitiveType.Word16.Size)
{
if (rdr.TryReadLeUInt16(out ushort uOffset))
{
addr = CreateSegmentedAddress(state.GetRegister(Registers.cs).ToUInt16(), uOffset);
return(true);
}
}
else
{
if (rdr.TryReadLeUInt16(out var off) && rdr.TryReadLeUInt16(out var seg))
{
addr = CreateSegmentedAddress(seg, off);
return(true);
}
}
addr = null;
return(false);
}
