Arguments

 

depadr

   OpenVMS usage:longword_unsigned
   type:         longword (unsigned)
   access:       read only
   mechanism:    by reference
   Depth to which the procedure call stack is to be unwound. The
   depadr argument is the address of a longword value. The value 0
   specifies the call frame of the procedure that was executing when
   the condition occurred (that is, no call frames are unwound); the
   value 1 specifies the caller of that frame; the value 2 specifies
   the caller of the caller of that frame, and so on.

   If depadr specifies the value 0, no unwind occurs and $UNWIND
   returns a successful condition value in R0.

   If you do not specify depadr (or with some languages you specify
   an address of 0), $UNWIND unwinds the stack to the call frame
   of the procedure that called the procedure that established the
   condition handler that is calling the $UNWIND service. This is
   the default and the normal method of unwinding the procedure call
   stack.
 

newpc

   OpenVMS usage:address
   type:         longword (unsigned)
   access:       read only
   mechanism:    by value
   New value for the program counter (PC); this value replaces the
   current value of the PC in the call frame of the procedure that
   receives control when the unwinding operation is complete. The
   newpc argument is a longword value containing the address at
   which execution is to resume.

   Execution resumes at this address when the unwinding operation is
   complete.

   If you do not specify newpc, execution resumes at the location
   specified by the PC in the call frame of the procedure that
   receives control when the unwinding operation is complete.