1.3.1. Importance of PSW in Jump Instructions

Try these first

1. 1.

   What is the purpose of the Program Status Word (PSW)?

   Hint

   What does PSW help retain when jumping?

2. 2.

   Define a jump instruction.

   Hint

   Think about how loops work.

3. 3.

   What is included in the Program Status Word (PSW)?

   • Only the next instruction pointer
   • Error status
   • next instruction pointer
   • and flags
   • Just the flags

   Hint

   Think about what information you need to remember when jumping.

4. 4.

   True or False: The PSW is only relevant after a jump instruction.

   • True
   • False

   Hint

   Is PSW only concerned with jumps?

5. 5.

   Create a scenario where a function is called, requiring the PSW to save the state. Explain what components should be saved in the PSW.

   Hint

   Consider what information is crucial for returning after an interruption.

6. 6.

   Discuss the potential pitfalls of failing to save the PSW during a critical operating system call.

   Hint

   What kind of problems might it create when execution resumes?