According to 32-bit x86 instruction encoding scheme, the EIP register (instruction pointer) cannot be encoded. (Encoding uses 3 bits to specify one of the eight registers: EAX, ECX, EDX, EBX, ESP, EBP, ESI, and EDI – EIP is conspicuously missing). This is generally OK for most user codes, but some system codes need to obtain the content of EIP.
a) Devise a scheme (i. e., a hack) that allows you to get the content of EIP register using regular x86 instructions. Explain also why your scheme works. (Hint: stack can be useful)