17.4.2. Executing the Jump to Function

Try these first

1. 1.

   What does the Program Counter do?

   Hint

   Think about which component manages instruction flow.

2. 2.

   What's the purpose of the stack pointer?

   Hint

   Consider where you would store temporary data.

3. 3.

   What value does the Program Counter hold before executing a jump instruction?

   • The address of the next instruction
   • The current instruction
   • The value of the stack pointer

   Hint

   Think of the PC's role in execution order.

4. 4.

   True or False: Conditional jumps are executed regardless of the status of the relevant flags.

   • True
   • False

   Hint

   Determine what makes a conditional jump execute.

5. 5.

   A PC is currently at address 4000, and it needs to jump to address 4300. Calculate the offset and explain its usage in the jump instruction.

   Hint

   Remember the substitution of offsets instead of direct addressing.

6. 6.

   During a function call, articulate the procedure of saving registers along with the PC. How does this affect future instructions?

   Hint

   Think about how functions disrupt and subsequently restore operational flow.