Performing single-step operations in the disassembly view

Use the STEP command to single-step through your program. In the disassembly view, you step from one disassembly instruction to the next. z/OS® Debugger highlights the instruction that it runs next.

If you try to step back into the program that called your program, set a breakpoint at the instruction to which you return in the calling program. If you try to step over another program, set a breakpoint immediately after the instruction that calls another program. When you try to step out of your program, z/OS Debugger displays a warning message and lets you set the appropriate breakpoints. Then you can do the step.

z/OS Debugger refreshes the disassembly view whenever it determines that the disassembly instructions that are displayed are no longer correct. This refresh can happen while you are stepping through your program.