What should a CPU simulator support?

[s88]

Hi all:
      I'm trying to implement a gdb stub for a CPU simulator.
The CPU simulator interprets each instruction in a big while loop.
My question is: Is it enough for my simulator to support a single step
run (simulate a single instruction per called) function to the gdb
stub?

thanx

Dave.
-- 
System  on Chip Design  Lab.
Dept. of Computer Science and Information Engineering,
National Chung Cheng University
E-mail : s88.tw@acm.org