In ARM architecture, data is only transferred between memory and registers using load (LDR) and store (STR) instructions.
Unlike x86, ARM uses Register-Indirect Addressing, where memory addresses are computed using base registers + offsets.
There are three main types of addressing for single register load/store instructions:
The addressing modes available with a particular load or store instruction depend on the instruction class.
The following Table shows the addressing modes available for load and store of a 32-bit word or an unsigned byte.
