Peer Review

The code works nicely, is logically grouped, well commented and in whole, looks good! There isn't much to complain about, except maybe a minor optimization. You seem to have added an unnecessary nop operation under the syscall in the proc1 procedure by accident, as the same is missing from the other procedures. In the kernel code, you have some branch instructions without nop operations below, which doesn't cause problems and is very efficient!

The code works good! You only use kernel reserved registers in the kernel, a "faulty" syscall opcode returns to user process and overflow leads to kernel loop, as should! SR register seems to work good also. All in all, good work!