Which of the following are common uses of the runtime stack? (Select all that apply) O Temporarily storing the values of local variables inside subroutines O Saving the return address when a CALL instruction executes

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
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**Question:**

Which of the following are common uses of the runtime stack? (Select all that apply)

- ☐ Temporarily storing the values of local variables inside subroutines
- ☐ Saving the return address when a CALL instruction executes
- ☐ Passing arguments to subroutines
- ☐ Saving the values of registers that are being used for multiple purposes
Transcribed Image Text:**Question:** Which of the following are common uses of the runtime stack? (Select all that apply) - ☐ Temporarily storing the values of local variables inside subroutines - ☐ Saving the return address when a CALL instruction executes - ☐ Passing arguments to subroutines - ☐ Saving the values of registers that are being used for multiple purposes
### Code Snippet Exercise

**Consider the following code snippet:**

```assembly
mov EAX, 177
mov EBX, 20

push EAX
push 00000037h     ; this is 55 in hexadecimal
pop EAX
pop EBX
```

**Task:**

Select the correct decimal values below for the `eax` and `ebx` registers after execution of this code.

**Registers:**

- **EAX**  
  [ Choose ]

- **EBX**  
  [ Choose ]

### Explanation:

1. **mov EAX, 177**: Assigns the decimal value 177 to the EAX register.
2. **mov EBX, 20**: Assigns the decimal value 20 to the EBX register.
3. **push EAX**: Pushes the current value of EAX (177) onto the stack.
4. **push 00000037h**: Pushes the hexadecimal value 37 (which is 55 in decimal) onto the stack.
5. **pop EAX**: Pops the value from the top of the stack into EAX. This will be 55 (the last value pushed).
6. **pop EBX**: Pops the next value from the stack into EBX. This will be 177 (the value previously pushed).

### Resulting Values:

- **EAX** will be **55**.
- **EBX** will be **177**.
Transcribed Image Text:### Code Snippet Exercise **Consider the following code snippet:** ```assembly mov EAX, 177 mov EBX, 20 push EAX push 00000037h ; this is 55 in hexadecimal pop EAX pop EBX ``` **Task:** Select the correct decimal values below for the `eax` and `ebx` registers after execution of this code. **Registers:** - **EAX** [ Choose ] - **EBX** [ Choose ] ### Explanation: 1. **mov EAX, 177**: Assigns the decimal value 177 to the EAX register. 2. **mov EBX, 20**: Assigns the decimal value 20 to the EBX register. 3. **push EAX**: Pushes the current value of EAX (177) onto the stack. 4. **push 00000037h**: Pushes the hexadecimal value 37 (which is 55 in decimal) onto the stack. 5. **pop EAX**: Pops the value from the top of the stack into EAX. This will be 55 (the last value pushed). 6. **pop EBX**: Pops the next value from the stack into EBX. This will be 177 (the value previously pushed). ### Resulting Values: - **EAX** will be **55**. - **EBX** will be **177**.
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