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Implementing FORTRAN 77 Subprogs

• Call Semantics:
  • Save the execution status of the caller
  • Carry out the parameter-passing process
  • Pass the return address
  • Transfer control to the callee

• Return Semantics:
  • If pass-by-value-result is used, move current values of parameters to their corresponding actuals
  • If it is a function, move return value to a place the caller can get it
  • Restore the execution status of the caller
  • Transfer control back to the caller

• Required Storage:
  • Status information of the caller, parameters, return address, and functional value (if it is a function)