Answer Posted / sysprog
The content of a base register is added to a displacement, and/or to the content of an index register, thereby to determine the address of the source or destination memory location upon which the instruction is to act.
When 0 is specified in the base regester position in an instruction, it is not interpreted by the assembler or the machine as a base register or as referencing register 0; in that position it means no base register for that instruction.
A program base register is used in specifying addesses of memory areas within the program, including instructions and storage areas.
| Is This Answer Correct ? | 0 Yes | 0 No |
Post New Answer View All Answers
Ap wkur,=p5 where wkur is a label?
Explain about maximum displacement?
how to initialize a register to 0000?
What is house keeping in assembler?
Explain how to initialize a register to 0000?
How many maximum base registers we can have in a program?
Explain how to pass instream data in sysin with assembler?
What is maximum displacement?
Explain how to produce soc7 abend?
What does the following code do? Ap wkur,=p5 where wkur is a label?
How is data passed from a calling program to an assembler called program?
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?
What is maximum displacement and how to cross this limit?
How do you round the addition or subtraction of two numbers in assembler?
what is need of start 0? In steed of
