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bwasti | 5 years ago

You can just try the instructions with an off-the-shelf assembler. They're not supported.

discuss

saagarjha|5 years ago

Unless you have to toggle an MSR, of course…

andy_ppp|5 years ago

I’m kind of interested about what happens if you throw random opcodes at processors now!

aw1621107|5 years ago

You might be interested in sandsifter [0], which does precisely that!

[0]: https://github.com/xoreaxeaxeax/sandsifter

dirtypersian|5 years ago

I would guess the processor would just cause an exception/interrupt and it would just call an OS level exception/interrupt handler which would probably tell the user what the exception/interrupt was that occured; in this case an unsupported instruction.

nicoburns|5 years ago

I believe most processors have undocumented opcodes. Often used for internal debugging or similar.

grishka|5 years ago

Your program will crash with SIGILL.