If we want to master the Buffer Overflow technique, first we must have a knowledge in CPU Register. Register is the part of the processor’s memory that can be accessed with a high speed and always used by microprocessor as the medium to do its work.
An x86 based CPU used 8 register : EAX, EBX, ECX, EDX, ESI, EDI, EBP, and ESP. Each of them designed for a specific job that make the CPU process the information eficiently.
1. EAX Register
Used to perform calculations and store the value returned from the function call. Basic operations such ass add, subtract, and compare is optimized in EAX Register. Special operations such as multiplication and divide are done by EAX Register. Continue Reading