- From the console, press <ctrl-A>
Note: symmon can also be invoked from any odd-numbered CPU port on IP5 and IP7 systems, except for the IRIS-4D/210.
- Set the dbgstop environment variable from command mode before booting the kernel. (You cannot use kernel symbols at this point, but all other functions work.) To do so, set the dbgstop environment variable:
> setenv dbgstop 1
This transfers control to symmon(1) early in system startup. (Symbolic debugging is not enabled at this point.)
- Set the symstop environment variable from command mode before booting the kernel:
> setenv symstop 1
This transfers control to symmon(1) after the symbol table has been loaded but early in the system startup procedure.
- Insert a call to the debug(uchar_t *msg) service from a known location within your kernel.
- The IRIX kernel executes a breakpoint instruction.
- A system panic occurs.