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Use the s command to resume execution in single-step mode:
s [-r] /* Single-step */Single-stepping is used when precise control over instruction execution is required. As each instruction is executed, control is passed back to the debugger, which disassembles the next instruction to be executed. The user must give input at this point before execution will continue.
SCODB can dump the system registers at each instruction. This mode can be set by default with the SSREG tunable parameter; specifying the -r option to the single-step command toggles the current value. This mode is useful for observing register value changes from each instruction.