Restrictions for debugging assembler programs that consist of multiple sections

When your assembler program consists of multiple sections, indicate that debug information should be loaded for all sections by using command SET LDD ALL before using the LDD command.

For more information, see Multiple compilation units in a single assembly.

If the debug information is not loaded for all sections in the compile unit (CU), the result can be unpredictable, and an abnormal termination (ABEND) might occur.

In the following example, the EX instruction and its target are coded in separate CSECTs of the program:

A     CSECT          
           L     15,B$BASE
           BASR  14,15
B          CSECT
           LA    5,8
           EX    5,MVC
           BR    14
A          CSECT
B$BASE     DC    A(B)
MVC        MVC   TO(0),FROM 
TO         DC    CL9'123456789'
FROM       DC    CL9'987654321'

If the debug information is loaded for CSECT A that contains the target of the EX instruction, but not loaded for CSECT B that contains the EX instruction, the EX instruction will abend immediately after the STEP command is performed on the BASR 14,15 instruction.