CPU Registers

General Purpose Registers

Register	Description	Usage
`eax`	Accumulator	Arithmetic operations, I/O port access, interrupt calls, and some other operations
`ebx`	Base	Pointer to data in the DS segment
`ecx`	Counter	Loop counter for string and loop operations
`edx`	Data	I/O port access, arithmetic operations
`esi`	Source	Pointer to data in the segment pointed to by the DS register; source pointer for string operations
`edi`	Destination	Pointer to data (or destination) in the segment pointed to by the ES register; destination pointer for string operations
`esp`	Stack	Pointer to the current location on the stack
`ebp`	Base Pointer	Pointer to data on the stack
`eip`	Instruction Pointer	Pointer to the next instruction to be executed

Register	Description	Usage
`rax`	Accumulator	Arithmetic operations, I/O port access, interrupt calls, and some other operations
`rbx`	Base	Pointer to data in the DS segment
`rcx`	Counter	Loop counter for string and loop operations
`rdx`	Data	I/O port access, arithmetic operations
`rsi`	Source	Pointer to data in the segment pointed to by the DS register; source pointer for string operations
`rdi`	Destination	Pointer to data (or destination) in the segment pointed to by the ES register; destination pointer for string operations
`rsp`	Stack	Pointer to the current location on the stack
`rbp`	Base Pointer	Pointer to data on the stack
`rip`	Instruction Pointer	Pointer to the next instruction to be executed

Register	Description	Usage
`cs`	Code Segment	Pointer to the current code segment
`ds`	Data Segment	Pointer to the current data segment
`es`	Extra Segment	Pointer to an extra data segment
`fs`	Extra Segment	Pointer to an extra data segment
`gs`	Extra Segment	Pointer to an extra data segment
`ss`	Stack Segment	Pointer to the current stack segment