1. What is the difference between these two instructions?

 mov rax, stuff mov eax, stuff 

2. Explain in detail this instruction:

 lea rsi, [rbp-8]

3. The x86-64 processor has sixteen 64-bit registers (all but RBP and RSP are GPRs): RAX, RBX, RCX, RDX, RDI, RSI, RBP, RSP, R8, R9 , R10, R11, R12, R13, R14, R15. It is also possible to reference a chunk of a 64-bit register (i.e., a sub-register). For example, what does EAX refer to?