Could subroutines use a dedicated section of memory (allocated in .data or .bss) for backing up and restoring register values, instead of using the stack?Question 1Select one:a.Not possible.b.Yes, but it is impossible to use this method and also use the stack to pass parameters to any functions called.c.Yes, this would work fine but it requires more work.d.Yes, but this would only work for a small number of registers because .data and .bss are smaller than the stack segment.

Why must registers be backed up at the beginning of a subroutine, and restored before returning?Question 5Select one:a.Conventions dictate that all registers are moved onto the stack.b.Registers might spontaneously change value, therefore backing them up is advisable to prevent against data loss.c.A subroutine expects parameters to be stored on the stack.d.Saving/restoring registers creates the illusion that each subroutine has its own independent set of registers, despite the CPU only having a single set that's shared across the entire program.

What do WRAMP subroutines use the system stack for?Question 14Select one:a.Saving/restoring register values, passing parameters to other subroutines, and storing all local variables.b.Passing parameters to other subroutines, saving/restoring registers, and returning values to the caller.c.Saving/restoring register values, passing parameters to other subroutines, and storing any local variables that don't fit into registers.d.A general area of memory for storing data.

Is it possible for a subroutine to comply with the WRAMP ABI conventions without decrementing/incrementing the stack pointer $sp at all?Question 3Select one:a.No.b.Yes, provided that it only modifies registers that are not being used elsewhere in the program.c.Yes, but it would have to return immediately without executing any instructions other than "jr $ra".d.Yes, provided that it does not modify any registers except $1, and does not call further subroutines.

When a subroutine is called, the address of the instruction following the CALL instruction is stored in/on the a)         stack pointerb)         accumulatorc)         program counterd)         stack

Which of the following statements is false?Question 2Select one:a.The register $ra does not need to be backed up and restored if the subroutine does not call any other subroutine.b.A subroutine does not need to back up and restore the register $1 in any circumstances.c.The CPU will modify the value stored in $ra when "jal" is executed.d.Each subroutine has its own independent set of registers, much like local variables in C or Java.Clear my choice