General Purpose Registers

Nickname of EAX/RAX register

Accumulator

Nickname of ECX/RCX register

Counter

Nickname of EDX/RDX register

Data

Nickname of ESI/RSI register

Source Index

Nickname of EDI/RDI register

Destination Index

Nickname of EBP/RBP register

Base Pointer

Nickname of EBX/RBX register

Base

Nickname of ESP/RSP register

Stack Pointer

What does the EAX/RAX register do?

Holds results of math operations, also performs some as well.

What does the EBX/RBX register do?

Holds pointers

What does the ECX/RCX register do?

Counts loops such as for loops.

What does the EDX/RDX register do?

Holds extra data.

What does the ESI/RSI register do?

Points to data you’re reading (strings, memory)

What does the EDI/RDI register do?

Points to where you’re writing.

What does the EBP/RBP register do?

Marks the start of the function’s stack frame

What does the ESP/RSP register do?

It points to the top of the stack.