Xpedite an assembly program

chiru_sh · New User Joined: 21 Feb 2008 Posts: 18 Location: Mumbai

Hi,

I am trying to debug a ASSEMBLY program after which a COBOL program is called through Xpeditor.

Let me explain:

There is a Assembly Pgm 'A' which is populating some value in a variable. This value is then printed in a report in COBOL pgm 'C'. I want to find the variable in Assembly which is being printed in pgm 'C'.

So thru expeditor when I reach pgm C. I want to retrace to pgm 'A'.

Is retracing possible in assembly. If not, what can I do in this case.

Please let me know what options I can use in Xpeditor.

Thanks in advance.

Bill O'Boyle · Posted: Thu Jun 19, 2008 7:42 pm

I'm unsure whether you can do this or not, but, I need to ask the following.

Is the Assembler program the Main-Program who then BALR's (CALL's) the COBOL program, which I'm guessing is LE compliant?

The reason I ask has to do with R12 (Register 12), which points to the "Common Anchor Area" (CEECAA) in each LE Enclave.

IMHO, R12 is "Off Limits" when you're dealing with LE-compliant COBOL and non LE-compliant Assembler.

Corrupting R12 will cause unpredictable results and an abend.

Regards,

Bill

chiru_sh · New User Joined: 21 Feb 2008 Posts: 18 Location: Mumbai

Thanks for reply....

Actually the screnario is like this

There is a main COBOL program which calls Assembly program....See the figure
calls
Mainpgm 'C1' ----> Assembly pgm 'A' (Populates some var X)
<----
calls
-----> Cobol pgm 'C2' (Writes this value to a file)

This Var X is coming incorrect in the file. I dont know which variable in assembly is populating this Var X.

So want to back-track from pgm 'C1' to pgm 'A'. I am not getting in Mainpgm 'C1' where the pgm 'A' is called.

So want to expedite back in C1 to pgm A, so that I can come to know where the pgm A is called.

Let me know if you understood the screnario.

I am stuck at this point. Please tell how can i can backtrack to A.

Any other solution also invited.

Craq Giegerich · Posted: Thu Jun 19, 2008 8:17 pm

Maybe by reading the code.

UmeySan · Posted: Fri Jun 20, 2008 5:53 pm

Hi chiru_sh !

There's no Back-tracking. Start your trace-session with programm C1.
Set breakpoints before Assembler-Pgm is called and after the return.

Then INT the Assembler-Programm and also define your breakpoints. Step throught it. You could always switsh beetween the modules using SOU Command.

Nice trace & nice weekend

Bill O'Boyle · Posted: Fri Jun 20, 2008 6:07 pm

UmeySan,

The million dollar question on my mind would be "Has his shop purchased the Assembler XPEDITER Source-Level Option"?

If not, then he'll have to set his breakpoints on offsets.

This works, but it can be cumbersome.

Regards,

Bill

UmeySan · Posted: Mon Jun 23, 2008 4:25 pm

Pleasant Morning Bill !

Sorry, I hadn't waste much thought on the fact, that a company which operates assembler programs has not installed the SubTool for assembler.