The Program Counter (PC) is accessed as PC (or R15). It is incremented by the size of the instruction executed, which is always four bytes in A32 state. Branch instructions load the destination address into the PC. You can also load the PC directly using data operation instructions. For example, to branch to the address in a general purpose register, use:
During execution, the PC does not contain the address of the currently executing instruction. The address of the currently executing instruction is typically PC-8 for A32, or PC-4 for T32.
ARM recommends you use the
BX instruction to
jump to an address or to return from a function, rather than writing
to the PC directly.