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Write a sequence of statements that use only PUSH and POP instructions to exchange the values in the EAX and EBX registers (or RAX and RBX in 64-bit mode).

Write a sequence of statements that use only PUSH and POP instructions to exchange the values in the EAX and EBX registers (or RAX and RBX in 64-bit mode).

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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### Problem Statement **Question 9:** Write a sequence of statements that use only PUSH and POP instructions to exchange the values in the EAX and EBX registers (or RAX and RBX in 64-bit mode). ### Explanation The problem requires you to use the assembly language instructions `PUSH` and `POP` to swap the values of two CPU registers (EAX and EBX in 32-bit mode, or RAX and RBX in 64-bit mode). These instructions are used to manipulate the stack in low-level programming. ### Solution The assembly code to achieve this using the stack is as follows: 1. **Push the value in EAX (or RAX) onto the stack:** ```assembly PUSH EAX ; Push the value in EAX onto the stack ``` 2. **Push the value in EBX (or RBX) onto the stack:** ```assembly PUSH EBX ; Push the value in EBX onto the stack ``` 3. **Pop the value from the stack into EAX (or RAX):** ```assembly POP EAX ; Pop the top value from the stack into EAX ``` 4. **Pop the value from the stack into EBX (or RBX):** ```assembly POP EBX ; Pop the top value from the stack into EBX ``` ### Final Code Here is the sequence of assembly code to exchange the values: ```assembly PUSH EAX ; Step 1: Save EAX on the stack PUSH EBX ; Step 2: Save EBX on the stack POP EAX ; Step 3: Load the original EBX value into EAX POP EBX ; Step 4: Load the original EAX value into EBX ``` ### Explanation of the Stack Operations - **Step 1:** The value in EAX is pushed onto the stack. The stack pointer (ESP) is decremented, and the value of EAX is stored at the new top of stack. - **Step 2:** The value in EBX is pushed onto the stack. The stack pointer (ESP) is decremented again, and the value of EBX is stored at the new top of stack. - **Step 3:** The value at the top of the stack (originally EBX
Transcribed Image Text:### Problem Statement **Question 9:** Write a sequence of statements that use only PUSH and POP instructions to exchange the values in the EAX and EBX registers (or RAX and RBX in 64-bit mode). ### Explanation The problem requires you to use the assembly language instructions `PUSH` and `POP` to swap the values of two CPU registers (EAX and EBX in 32-bit mode, or RAX and RBX in 64-bit mode). These instructions are used to manipulate the stack in low-level programming. ### Solution The assembly code to achieve this using the stack is as follows: 1. **Push the value in EAX (or RAX) onto the stack:** ```assembly PUSH EAX ; Push the value in EAX onto the stack ``` 2. **Push the value in EBX (or RBX) onto the stack:** ```assembly PUSH EBX ; Push the value in EBX onto the stack ``` 3. **Pop the value from the stack into EAX (or RAX):** ```assembly POP EAX ; Pop the top value from the stack into EAX ``` 4. **Pop the value from the stack into EBX (or RBX):** ```assembly POP EBX ; Pop the top value from the stack into EBX ``` ### Final Code Here is the sequence of assembly code to exchange the values: ```assembly PUSH EAX ; Step 1: Save EAX on the stack PUSH EBX ; Step 2: Save EBX on the stack POP EAX ; Step 3: Load the original EBX value into EAX POP EBX ; Step 4: Load the original EAX value into EBX ``` ### Explanation of the Stack Operations - **Step 1:** The value in EAX is pushed onto the stack. The stack pointer (ESP) is decremented, and the value of EAX is stored at the new top of stack. - **Step 2:** The value in EBX is pushed onto the stack. The stack pointer (ESP) is decremented again, and the value of EBX is stored at the new top of stack. - **Step 3:** The value at the top of the stack (originally EBX
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