Machine-level debugging

The dbx subcommands for machine-level debugging are:
address /
Just specifying an address displays the contents of memory.
display memory
Displays the contents of memory.
gotoi
Changes program counter addresses.
map
Displays address maps and loader information for the application program.
nexti
Runs the application program up to the next machine instruction.
registers
Displays the values of all general-purpose registers, system-control registers, floating-point registers, and the current instruction register.
stepi
Runs one source instruction.
stopi
Sets a stop at a specified location.
tracei
Turns on tracing using a machine instruction address.