What is CS DS ES SS?

In real mode, the registers CS, DS, SS, and ES point to the currently used program code segment (CS), the current data segment (DS), the current stack segment (SS), and one extra segment determined by the programmer (ES).

What is SS register in x86?

In the 16-bit Intel x86 architecture: SS is the stack-segment register. It identifies the block of memory that will be used for the stack. SP is the stack pointer register.

What is the ESP register?

The ESP register is the stack pointer for the system stack. It is rarely changed directly by a program but is changed when data is pushed onto the stack or popped from the stack. One use for the stack is in procedure calls. the address of the instructions following the procedure call instruction is stored on the stack.

What is SP register?

The Stack Pointer (SP) register is used to indicate the location of the last item put onto the stack. When you PUT something ONTO the stack (PUSH onto the stack), the SP is decremented before the item is placed on the stack.

What is DS register?

A 16-bit Data Segment register or DS register stores the starting address of the data segment. Stack Segment − It contains data and return addresses of procedures or subroutines. It is implemented as a ‘stack’ data structure. The Stack Segment register or SS register stores the starting address of the stack.

What is CS register?

Code segment register (CS): is used for addressing memory location in the code segment of the memory, where the executable program is stored. Data segment register (DS): points to the data segment of the memory where the data is stored.

What register is DS?

data segment register
DS is called data segment register. It points to the segment of the data used by the running program. You can point this to anywhere you want as long as it contains the desired data. ES is called extra segment register.

How many registers does x86-64 have?

As well, 64-bit x86 includes SSE2, so each 64-bit x86 CPU has at least 8 registers (named XMM0–XMM7) that are 128 bits wide, but only accessible through SSE instructions.

What is ESP and EIP?

EIP is the instruction pointer. It points to (holds the address of) the first byte of the next instruction to be executed. ESP is the stack pointer. It points to (holds the address of) the most-recently pushed value on the stack.