Question

Suppose there were no PUSH instruction. Write a sequence of two other instructions that would accomplish the same as push eax

Answer 1

Write a sequence of two other instructions that would accomplish the same as push eax

Ans:

• sub esp,4
• mov [esp],eax

============================================================================================

ESP is known as stack pointer register. it holds 32 bit offset into some location on the stack. ESP always points to top of thr stack.

first instruction decrement the stack pointer esp by 4.

second instruction copy a value eax into the stack location pointed to by the stack pointer esp.