What is LDR in assembly language?

The LDR pseudo-instruction is used for two main purposes: to generate literal constants when an immediate value cannot be moved into a register because it is out of range of the MOV and MVN instructions. to load a program-relative or external address into a register.

What is the difference between MOV and MOVS?

Operation. The MOV instruction copies the value of Rm into Rd . The MOVS instruction performs the same operation as the MOV instruction, but also updates the N and Z flags. The MVNS instruction takes the value of Rm , performs a bitwise logical negate operation on the value, and places the result into Rd .

What is the difference between Move and load?

Data movement instructions can be grouped into loads, stores, moves, and immediate loads. Load instructions move data from memory to registers. Move instructions move data from one register to another.

What does LDRB mean in assembly language?

Load Register Byte
Load Register Byte (register).

What is MOVS in arm?

The MOV instruction copies the value of Operand2 into Rd . The MVN instruction takes the value of Operand2 , performs a bitwise logical NOT operation on the value, and places the result into Rd . In certain circumstances, the assembler can substitute MVN for MOV , or MOV for MVN .

What is difference between load and store?

A load operation copies data from main memory into a register. A store operation copies data from a register into main memory . When a word (4 bytes) is loaded or stored the memory address must be a multiple of four.

How does STR work in assembly?

String Instructions

1. MOVS − This instruction moves 1 Byte, Word or Doubleword of data from memory location to another.
2. LODS − This instruction loads from memory.
3. STOS − This instruction stores data from register (AL, AX, or EAX) to memory.
4. CMPS − This instruction compares two data items in memory.

What is MOV instruction with example?

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….MOV A, #immediate.