How are data passed from JCL parm to assembler program. And
how is data passed from a calling program to an assembler
called program.
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Answer Posted / joseph louis pargas
By convention, general purpose register 1 will have the
address of the parameter list. The list will be a list of
pointers (addresses) to individual parameters. The CALL
macro does this, but you can bypass the CALL macro and be
creative on how you set up the parameter list. Don't forget
the parameter must be on a fullword boundary.
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In the house keeping section of an MVS assembly language program, like the one below STM R14,R12,12(R13) BASR R12,R0 USING *,R12,R11 LA R11,2048 LA R11,2048(R11,R12) .... .... 1. What if BASR R12,R0 IS NOT PRECEDE USING *,R12,R11? 2. USING (base address), REGISTER does USING directive says assembler to treat particular Register as a base register with the mentioned base address..in the above case * i.e current location counter..well if that is the case why we need BASR R12,R0 ? 3. What if I write like STM R14,R12,12(R13) BASR R12,R0 LA R11,2048 LA R11,2048(R11,R12) USING *,R12,R11 there is no address resolution being calculated in both LA statements so is it a right way to set Base register?..will there be any issues with Domain regarding R11 and R12?
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