ARM Machine Code (32bit: not Cortex-M)


Major features of the ARM machine code
Unaligned access is not allowed (like all RISC)
No assignment of 32-bit constants is possible (like all RISC)
There is no hardware-managed stack pointer (like all RISC)
Load-multiple and store-multiple instructions
Every instruction is conditionally executed
The status bits are modified only optionally
One operand can be shifted at no cost
All addressing is register-relative

Other features typical of RISC processors, but missing in ARM:
Register windows
«Delay slot» for jumps
Zero register