DUnit2的CallerAddr函数有什么作用，如何将其转换为64位？

I am trying to get DUnit2 working under 64 bits, but I am stumped to what this method does, let alone how to convert it to 64 bits. Pure Pascal would better, but since it refers to the stack (ebp), it might not be possible.I am trying to get DUnit2 working under 64 bits