Question

What is the int 3 instruction used for in debugging?

a.

To replace the original instruction in the program

b.

To notify the debugger that a breakpoint has been reached

c.

To freeze the program

d.

To execute each instruction individually and return control to the debugger

Posted under Reverse Engineering

Answer: (b).To notify the debugger that a breakpoint has been reached Explanation:The int 3 instruction is a special breakpoint interrupt that notifies the debugger that a breakpoint has been reached. Once the debugger is notified, it replaces the int 3 with the original instruction from the program and freezes the program so that the operator can inspect its state.

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