What is mov in ASM?

mov — Move (Opcodes: 88, 89, 8A, 8B, 8C, 8E.) The mov instruction copies the data item referred to by its second operand (i.e. register contents, memory contents, or a constant value) into the location referred to by its first operand (i.e. a register or memory).

What is mov in machine code?

“mov” is the “opcode”, “instruction”, or “mnemonic”. It corresponds to the first byte (or so!) that tells the CPU what to do, in this case move a value from one place to another. The opcode tells the CPU what to do. “eax” is the destination of the move, also known as the “destination operand”.

Does mov copy or move assembly?

it does a copy…

  • Hi @Wagner Patriota: Thanks your reply.
  • @curlywei yes, a mov in assembly is a copy, not a move.
  • there are countless different assembly languages, different processors different syntax per processor depending on the tools vendors, etc.

    • What is MOV instruction?

    The MOV instruction moves data bytes between the two specified operands. The byte specified by the second operand is copied to the location specified by the first operand. The source data byte is not affected.

    What does MOV EBP ESP do?

    A stack frame is used to store local variables and each function will have its own stack frame in memory. mov ebp, esp moves the current stack position into EBP which is the base of the stack. We now have a reference point that allows us to reference our local variables stored on the stack.

    What does mov eax mean?

    mov [eax], [ebx] would mean “move the contents of the memory location pointed to by ebx to the memory location pointed to be eax . That is a memory-to-memory move, which Intel does not support.

    What is the opcode for instruction add sub and MOV?

    “mov” is the “opcode”, “instruction”, or “mnemonic”….Arithmetic In Assembly.

    Opcode Does Example
    add + add eax,ecx
    sub – sub eax,ecx
    imul * imul eax,ecx
    idiv / idiv ecx <- Warning! Weirdness! (see below)

    What is the difference between MOV and Lea?

    MOV will grab the data at the address inside the brackets and place that data into the destination operand. LEA will perform the calculation of the address inside the brackets and place that calculated address into the destination operand. This happens without actually going out to the memory and getting the data.

    Does MOV replace?

    The MOV instruction overwrites the destination. That code doesn’t add to anything. It overwrites the 10 bytes at the destination, replacing them with the 10 bytes at the source.

    Can the MOV instruction only be used to move the value in one register to another register?

    The MOV instruction has a few limitations: an immediate value cannot be moved into a segment register directly (i.e. mov ds,10) segment registers cannot be copied directly (i.e. mov es,ds)…The MOV instruction.

    destination source example
    memory register mov aDigit,ax