Currently C::B supports the GDB "info registers" command to get the registers to then display them. You can use the GDB "info all-registers" commann via the Debugger tab to get all of the registers that this GDB command supports on the particular CPU you are using, which looks like it will do what you want on the CPU I have.
Sounds like you need to read up on GDB and how to use it if you want to look at the machine code the compiler generated.