Originally Posted by knc1
That is not possible, the processor core will execute an: "Illegal instruction" trap.
Actually, your claim is not true for the ARM7TDMI (and others):
ARM architecture reference manual, chapter 3.13, "Extending the instruction set". "UNPREDICTABLE" instructions are not caught by the undefined instruction exception.
Saying things are "not possible
" is an absolute statement, and we should know by now that speaking in absolutes risks unwitting propagation of falsehoods.
Or... are you just saying that the HCF
instruction gets trapped?