On Aug 17, 2011, at 2:56 , Joel Sherrill wrote: > Check the psim source in gdb. May not be implemented. They seem to be in there. For 32-bit it's at line 887 of "sim/ppc/vm.c" in gdb-7.2. You could put a breakpoint there in GDB and see what's happening. Peter ----------------- Peter Dufault HD Associates, Inc. Software and System Engineering