S(1spp)             RISC/os Reference Manual              S(1spp)



NAME
     s - single instruction execution, enters subprocedures
          S - single instruction execution, steps over subpro-
          cedures

SYNOPSIS
     s [count]
     S [ count ]

DESCRIPTION
     The S and s commands let you do single instruction execution
     of client code.  The s command executes a single instruc-
     tion.  S executes a single instruction except when that
     instruction is a jal or bal instruction.  In this case, S
     executes all instructions of the subprocedure until the pro-
     cedure returns to the site of the jal or bal.  S will fail
     to regain control if the subprocedure does not return.  Both
     S and s can optionally take a count argument, which causes
     the count of instructions to be stepped.

     For both the s or S commands, branch instructions and the
     following instruction in the branch delay slot are con-
     sidered "atomic" and a single step executes both instruc-
     tions.

SEE ALSO
     brk(1spp), unbrk(1spp), c(1spp)




























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