[ajenner]

A more recent example of an finite loop with no exit condition can be found in the credits section of the 2015 demoscene production "8088 MPH". The loop (which can be found at https://www.reenigne.org/blog/8088-pc-speaker-mod-player-how... under "v:") has two jumps (one conditional, one unconditional) both backwards, and runs with interrupts disabled. The CPU's instruction pointer stays within that block until the end of the routine - there's no wraparound to make a forward jump from a backward one.

[mijoharas]

So... How does it work then?

[ajenner]

There's a POP instruction in the loop that pops to a memory location addressed by a register. When that register contains the address of the final JMP instruction, the latter gets overwritten by a forward JMP.

[mlyle]

There's nops at the beginning of the loop that get written over.