User guide

Nios II IDE Help System

Viewing Disassembly

Viewing disassembly allows you to analyze the exact instruction-by-instruction execution

during a debug session. You can use the Disassembly view to see mixed C/C++ and assembly

source code, set breakpoints, and single step through your code.

To open Disassembly view:

To view disassembly, start a debug session. The Disassembly view displays in the Debug

perspective automatically.

To step through code:

By default, stepping through the code executes entire C/C++ statements. To step through

individual assembly instructions, click Instruction Stepping Mode in the Debug view

toolbar. In instruction stepping mode, stepping through code advances the instruction

pointer in the Disassembly view to the next assembly instruction. Because multiple

assembly instructions represent a single line of C/C++ code, the instruction pointer might

not advance in the C/C++ Editor view with each instruction step. Click

Instruction

Stepping Mode a second time to return to stepping at the C/C++ statement level.

Note: If the IDE cannot locate source code for a function, stepping through the code

automatically uses Disassembly view regardless of whether instruction stepping mode

is on or off.

To set breakpoints on assembly instructions:

Double-click in the margin to the left of the instruction to toggle an address breakpoint on

and off. You can also right-click in the margin, and then click Toggle Breakpoint.

To copy text from the Disassembly view:

You can highlight and copy text in the Disassembly view by using the keyboard shortcut

(e.g. Type Ctrl-C to copy on Windows).