REGISTERS

Register Types

Register Description
EAX Accumulator, used for multiplication and division.
EBX, EDX General-purpose registers.
ESI, EDI High-speed memory transfer registers.
ECX Loop counter register.
ESP Stack pointer, points to the next available location in stack memory.
EBP Base pointer, used to reference function parameters and local variables on the stack.
XMM0 [0-15] Floating-point registers.
EIP Instruction pointer, points to the address of the next instruction to execute.
EFLAGS Flags register indicating the status of an operation.

I can check more register types and information here.

Register Size

Register Size
EAX 32 bits
AX 16 bits
AH, AL 8 bits
  • x86 Registers, each register is 32 bits in size.
  • Registers like EAX, EBX, ECX, and EDX are standard, with the E denoting extended access to all 32 bits.
  • Dropping the E to access only 16 bits (e.g., AX, BX, CX, DX).
  • Can also access 8-bit high and 8-bit low bytes (e.g., AH, BH, CH, DH and AL, BL, CL, DL).
EFLAGS