is an expression evaluating to an integer in the range:
0-65535 (a 16-bit value) in an ARM instruction
0-255 (an 8-bit value) in a 16-bit Thumb instruction.
BKPT instruction causes the processor to
enter Debug state. Debug tools can use this to investigate system
state when the instruction at a particular address is reached.
In both ARM state and Thumb state,
ignored by the ARM hardware. However, a debugger can use it to store
additional information about the breakpoint.
BKPT is an unconditional instruction. It must
not have a condition code in ARM code. In Thumb code, the
does not need a condition code suffix because
executes irrespective of its condition code suffix.