What is house keeping in assembler? And explain the
following code
HELLOTSO START 0
* PRINT NOGEN
BEGIN SAVE (14,12)
LR 12,15
USING TYPE,12
ST 13,SAVE+4
LA 11,SAVE
ST 11,8(13)
LR 13,11
- 6 Answers
- 18571 Views
- Mind Tree, I also Faced
- E-Mail Answers
Answer Posted / mike m
Housekeeping is the work done at the start of an ALC
program that saves the contents of regs
14,15,0,1,2,3,4,5,6,7,8,9,10,11,12 into an addr off R13.
After that and in this example, R15(which contains prog.
entry point) is loaded into R12. The USING completes the
work to make R12 the BASE reg. Within this code @ label =
SAVE is a 72 byte work area. The first STORE(ST) saves the
contents of R13 -> 4 bytes into the address that SAVE is
located at. LA(Load Address) loads the address of the area
@ label = SAVE into REG 11. The second STORE(ST) then
stores the contents of Reg 11 -> 8 bytes beyond the addr.
in Reg 13. The LOAD REGISTER(LR) then loads the contents of
Reg 11 into Reg 13. REG 13 now has the addr of the area @
label = SAVE that may be used if this code calls another
routine.
| Is This Answer Correct ? | 6 Yes | 2 No |
Post New Answer View All Answers
explain about maximum displacement and how to cross this limit?
Explain about base register?
How many maximum base registers we can have in a single program?
how to initialize a register to 0000?
What is house keeping in assembler?
Explain the difference in data type "x" and "p"?
Why do we use "drop"?
Explain the difference between various read and find statement and which one should be used when for better adabas performance?
How to pass the parameters from jcl to assembler program?
how do you round the addition or subtraction of two numbers in assembler? what does the following code do? change process tool(code changes from dev to prd) the changes made to your code should be effected in live. How the process takes place. That is how can you move the code changes from development to production?
how to retrieve the instream data in sysin?
What is need of start 0? In steed of can we use anyother numerics? If we use what will happen?
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?
What is need of start 0?
