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Assembly Language Fundamentals
61
Source Listing Control
Listings of the source code in a module can be obtained during an assembly. These listings
contain the line numbers, instructions, and comments from the source lines along with the
associated machine addresses and contents of that address.
Here is part of a typical listing -
450
01036
14264~
4bJ
01~37
003005
'.:~
01041 056003
JMP ++3
': 'i'
'::::.1:
-3.("1 ..
~:./
; .
.1,:::;,:".3.
~~~
0L0~~
17200~
SAP ++3
I.yp~
"C,
)12)~
'line
\absolu~conten~actions
~comments
numbers addresses
The addresses and contents are displayed in octal representation.
Listings are not automatic. They are obtained in one of two ways-
• By using the LIST option in the IASSEMBLE statement. This directs that a listing is
desired for all the modules in the statement. The statement wO!lld look like the following
examples -
• By using the LST pseudo-instruction in the source code itself.
Modules can be just partially listed, if desired. This kind of control is achieved by using the LST
and UNL pseudo-instructions within the source code, placing the LST before any instructions
which you want listed, and placing the UNL before any instructions you do not want listed. For
example, if the following source lines are assembled-
:::j.(;~::::
'r .:..
!:
:1 ... :
1:::
I
only lines 430 through 500 would be listed.
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