Computer Architecture Call Instruction Quiz
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Questions and Answers

What is the purpose of the Call Instruction in a CPU?

  • Restores the register values from the stack
  • Increments the program counter (PC) to the next instruction
  • Loads the PC with the address of the entry point of the called line of code or subroutine (correct)
  • Stores register values on the stack at the location pointed to by the SP

    • What does the RET Instruction do in a CPU?

  • Stores register values on the stack at the location pointed to by the SP
  • Loads the PC with the address of the entry point of the called line of code or subroutine
  • Loads the PC with the return address stored on the stack (correct)
  • Increments the stack pointer to point to the new top of the stack

    • During a Call Instruction, where is the return address stored?

  • PC
  • SP (correct)
  • CPU
  • Memory

    • What is responsible for storing register values on the stack during a Call Instruction?

    <p>CPU</p> Signup and view all the answers

    What action does the Call Instruction take regarding the stack pointer (SP)?

    <p>Increments SP to point to new top of stack</p> Signup and view all the answers

    Which component does a RET Instruction primarily act upon?

    <p>Stack</p> Signup and view all the answers

    What does the mode bit in the Program Status Word (PSW) indicate?

    <p>The execution mode of a program</p> Signup and view all the answers

    What type of interrupt is generated by external devices at unpredictable times?

    <p>I/O device interrupt</p> Signup and view all the answers

    Which part of the operating system runs in kernel mode?

    <p>The heart of the OS</p> Signup and view all the answers

    What does a clock interrupt signal to the OS?

    <p>The passing of a certain amount of time</p> Signup and view all the answers

    In the context of interrupts, what does an error condition typically indicate?

    <p>Illegal application behavior</p> Signup and view all the answers

    What can code running in kernel mode do that code running in user mode cannot?

    <p>Access all memory</p> Signup and view all the answers

    What function does a system call serve in relation to user programs and the OS?

    <p>Interface for communication between applications</p> Signup and view all the answers

    What do privileged instructions refer to in the context of execution modes?

    <p>Instructions controlling machine functions and I/O</p> Signup and view all the answers

    What does hardware support enforce between processes?

    <p>Memory boundaries</p> Signup and view all the answers

    Which type of interrupt is caused by an exception when executing the current instruction?

    <p>Internal interrupts</p> Signup and view all the answers

    In what scenarios can code running in user mode be allowed to access memory?

    <p>When authorized by the OS within defined limits</p> Signup and view all the answers

    What does an I/O device interrupt typically inform the OS about?

    <p>Completion of I/O operation</p> Signup and view all the answers

    What component is responsible for enabling the operating system to control or monitor aspects of CPU function?

    <p>GP registers</p> Signup and view all the answers

    What is the purpose of the Program Counter (PC) in a CPU?

    <p>Tracks the memory address of the next instruction to be executed</p> Signup and view all the answers

    In the context of subroutines, what is the purpose of the Stack Pointer (SP)?

    <p>Points to the top of the stack</p> Signup and view all the answers

    When running an instruction, what does the ALU primarily do?

    <p>Executes the instruction</p> Signup and view all the answers

    What is the purpose of subroutines in a computer program?

    <p>Maintain the state of the calling function</p> Signup and view all the answers

    What makes up a stack frame in computing?

    <p>Local variables and input arguments</p> Signup and view all the answers

    What is the purpose of executing a TRAP instruction to switch from user mode to kernel mode?

    <p>To start execution at a fixed address within the kernel</p> Signup and view all the answers

    What does the systemcall handler do after examining the systemcall number?

    <p>Runs the system call</p> Signup and view all the answers

    In the context of system calls, what does the %eax register store before invoking a system call?

    <p>The number of system call to be executed</p> Signup and view all the answers

    What is the role of the interrupt vector in handling system calls?

    <p>Determining which system call handler to invoke</p> Signup and view all the answers

    Why is executing an int 64 instruction important in implementing a system call like fork()?

    <p>To signal an interrupt request</p> Signup and view all the answers

    What happens after a system call has been completed by the systemcall handler?

    <p>Control may be returned to the user program</p> Signup and view all the answers

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