
https://www.amazon.ca/Developing-Safety-Critical-Software-Pr...
You can read up on the system safety side in documents like ARP5754 and ARP4761 and hardware side in DO-254.
It's on par with everything else I've seen. I've skimmed through a few other books on the same area. They all appear to cover the same stuff.
I'd recommend the above book to see what most of safety-critical software is (documentation).