Question

How is single-stepping implemented on IA-32 processors?

a.

By replacing the original instruction with an int 3 instruction

b.

By using the processor’s trap flag (TF) in the EFLAGS register

c.

By generating an interrupt after every instruction that is executed

d.

By freezing the program after each instruction

Posted under Reverse Engineering

Answer: (b).By using the processor’s trap flag (TF) in the EFLAGS register Explanation:Single-stepping is implemented on IA-32 processors using the processor’s trap flag (TF) in the EFLAGS register. When the trap flag is enabled, the processor generates an interrupt after every instruction that is executed. In this case, the interrupt is interrupt number 1, which is the single-step interrupt.

Engage with the Community - Add Your Comment

Confused About the Answer? Ask for Details Here.

Know the Explanation? Add it Here.

Q. How is single-stepping implemented on IA-32 processors?

Add Comment

Similar Questions

Discover Related MCQs

Q. What is the purpose of incorporating antidebugger techniques in a program?

View solution

Q. How are breakpoints usually set in a program by a debugger?

View solution

Q. How do hardware breakpoints differ from software breakpoints?

View solution

Q. What is the single-step interrupt?

View solution

Q. What is IsDebuggerPresent API?

View solution

Q. What does IsDebuggerPresent API access to determine whether a user-mode debugger is attached?

View solution

Q. Why is directly calling IsDebuggerPresent not effective against reversers?

View solution

Q. How can the effectiveness of IsDebuggerPresent API be improved as an antidebugging measure?

View solution

Q. How many lines of assembly code does the implementation of IsDebuggerPresent API consist of?

View solution

Q. What is the disadvantage of embedding this code sequence within a program?

View solution

Q. What is IsDebuggerPresent?

View solution

Q. How does IsDebuggerPresent work?

View solution

Q. Why is calling IsDebuggerPresent not very effective against reversers?

View solution

Q. How can IsDebuggerPresent be implemented intrinsically?

View solution

Q. What is the disadvantage of implementing IsDebuggerPresent intrinsically?

View solution

Q. How likely are the internal offsets in the NT data structure to change?

View solution

Q. What is required to incorporate assembly language code into a program?

View solution

Q. What is the SystemKernelDebuggerInformation request code used for?

View solution

Q. What is the data structure returned by the SystemKernelDebuggerInformation request?

View solution

Q. What should be checked to determine whether a kernel debugger is attached to the system using SystemKernelDebuggerInformation?

View solution

View All MCQs on Reverse Engineering

Suggested Topics

Are you eager to expand your knowledge beyond Reverse Engineering? We've curated a selection of related categories that you might find intriguing.

Click on the categories below to discover a wealth of MCQs and enrich your understanding of Computer Science. Happy exploring!

Cloud Computing

Stay on top of the biggest trend in IT with our Cloud Computing MCQs. These questions...

Web Technologies

Master the building blocks of the web with our Web Technologies MCQs. From HTML and...

Management Information Systems

Discover how businesses leverage technology with our Management Information Systems...

DBMS

Get a firm grasp on database systems with our DBMS MCQs. Explore relational...

Neural Networks

Dive into the world of Artificial Intelligence with our Neural Networks MCQs. Uncover...

Python

Dive into one of the most popular languages with our Python MCQs. Understand...

Cryptography and Network Security

Secure your knowledge of information security with our Cryptography and Network...

Cyber Security

Understand the fundamentals of safeguarding digital assets with our Cyber Security...

Hadoop

Dive into the world of big data with our Hadoop MCQs. Cover key concepts including...