WHAT WILL HAPPEN IF WE DROP THE BASE REGISTER IN THE PGM
WHICH CONTAINS ONLY ONE BASEREG?
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Answer / phil
All references to labels dependant upon the base registers
using statement below the DROP instruction in the listing
will be unresolvable by the assembler.
| Is This Answer Correct ? | 5 Yes | 1 No |
Answer / nsugandhi
It will give an error at the time of assembly, if there are
some labels defined in the program(provided they are being
referenced in your program). This is because the assembler
resolves the displacement of that variable from the location
where your base register is pointing to.
| Is This Answer Correct ? | 2 Yes | 1 No |
Answer / guest
We cannot drop the base register, it is the memory location
for the whole program.
| Is This Answer Correct ? | 0 Yes | 6 No |
Why do we have multiple base registers in certain programs?
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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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