8 - More registers

Question 1

What does EAX stand for and how many bits does it contain?

Answer 1

Extended Accumulator Register and 32 bits (from 0 to 31).

Used as a general-purpose data register during both artithmetic and logical operations.

Eg: MOV EAX, 123 or INC EAX

Question 2

What does EBX stand for and what does it do?

Answer 2

Extended Base Register.

Holds addresses to point to the base of data structures, such as arrays in memory.

Eg: MOV AL, [EBX]

Question 3

What does using brackets do ? ie: [EBX] instead of EBX

Answer 3

It gets the value at that memory instead of the address.

Question 4

What does ECX stand for and what does it do?

Answer 4

Extended Counter Register.

Used as a counter in loops mostly.

Question 5

What does EIP stand for and what does it do?

Answer 5

Extended Instruction Pointer.

Holds the address of the next instruction.

Eg: JMP mylabel // forces a new address into the EIP

Question 6

EBP?

Answer 6

Stack Base pointer

Question 7

ESP ?

Answer 7

Stack pointer