alt Hacker NewsI was imagining more like some kind of primitive CPU mode that sends every single RAM request to a software exception. Something you would normally have turned off but available for truly heavy duty debugging.
Replies
jeffbee • yesterday at 11:35 PM
The operating system could effect this by not providing any page tables to the CPU, so every memory reference faults and the OS has to handle them all.
That sounds pretty similar to what Valgrind does, basically runs your program in a VM with that kind of instrumentation. The details of how it works are way past the boundaries of my own knowledge though :)