Library /sys$common/syshlp/dbg$help.hlb DEBUG, STEP, Qualifiers, /OVER  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    If execution is currently suspended at a routine call, STEP/OVER
    executes the routine up to and including the routine's return
    instruction (steps over that routine). The /OVER qualifier is the
    default behavior and is the opposite of /INTO.

                                   NOTE

       On Alpha processors, when execution is suspended at a source
       line that contains a loop with a routine call, STEP/OVER
       steps into the called routine. To step to the next program
       statement, set a temporary breakpoint at the statement and
       enter GO.