Instruction in Assembler to initialise variables

ssamineni · New User Joined: 10 Mar 2007 Posts: 16 Location: India

Hi,

Is there any instruction in Assembler to initialise variables?..

We need to initialise the map before we populate the values,currently we are moving spaces to each and every variable of map.is ther any other way to initialise any DSECT?

murmohk1 · Posted: Mon Jun 11, 2007 1:43 pm

ssamineni,

Did you try DC instruction?

ssamineni · New User Joined: 10 Mar 2007 Posts: 16 Location: India

I want to inidiatliase the whole dsect in my logic of the program.I think DC can be used to intialise a single variable.Please correct me if am wrong

murmohk1 · Posted: Mon Jun 11, 2007 5:31 pm

ssamineni,

William Thompson · Posted: Mon Jun 11, 2007 6:46 pm

ssamineni · New User Joined: 10 Mar 2007 Posts: 16 Location: India

In my CICS Assembler program,I have to intialise my BMS MAP variables before i populate the values. Currently we are initialising the variables by moving spaces in logic of the program. I am looking for some other option which can intialise the MAp rataher than individual fields

William Thompson · Posted: Mon Jun 11, 2007 10:59 pm

I don't think so, Usually the fields are left low-values unless you want something in them, and movint that value does not need spaces before hand.
You can move low-values to the map group name but not spaces, that would mess up the other map fields.

ssamineni · New User Joined: 10 Mar 2007 Posts: 16 Location: India

Thanks for the reply.

"You can move low-values to the map group name but not spaces, that would mess up the other map fields"

Could you please let me know how to do this?

UmeySan · Posted: Tue Jun 12, 2007 5:32 pm

Hi !

Use this little example to clear a mapset.

Regards, UmeySan

LA R14,MAPSET ...Load Map-Adress
LA R15,MAPLNG ...Load Map-Length

If MapLength not greater 256, you could use the EX-Instruction
to clear the whole Map. Otherwise you have to code a little Loop.

If MapLength not greater 256

...BCTR R15,0
...EX R15,XCMAP

...XCMAP XC 0(0,R14),0(R14)

End-If

If MapLength greater 256
Loop
...clear the first 256,bytes
...check for the rest
...clear the next bytes
End-Loop
End-If

William Thompson · Posted: Tue Jun 12, 2007 5:38 pm

I would think an overlapping MVCL would be easier......

UmeySan · Posted: Thu Jun 14, 2007 1:22 pm

May be...

many ways leading to rome !!!

ganeshptrk · New User Joined: 04 Apr 2007 Posts: 17 Location: Chennai

Firstly, you cannot have DC in a DSECT. Even if you have DC, the assembler will take the declare as DS.

So to initialize all the contents of a DSECT, you to have do it in the program where you are establishing the addressability with this DSECT.
You can use MVC if the total no.of bytes is <=256 bytes, else MVCL

ssrinath22 · New User Joined: 08 Mar 2007 Posts: 7 Location: chennai

any of thempls send me any sample programs of assembler........i wiould be thankful ..........my id is e-mail id removed

dick scherrer · Posted: Sun Jul 01, 2007 5:26 pm

Hello and welcome to the forums,

When posting, please check your spelling. I don't know what this "any of thempls" is.

Also, it is against forum policy to post your e-mail address - there have been many p[roblems with spammers.

If you are working an assembler module and have questions, post them here and we may be able to offer suggestions.