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.
Question
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.
Solution
WRAMP subroutines use the system stack for saving/restoring register values, passing parameters to other subroutines, and storing any local variables that don't fit into registers. This is option c.
Here's a step-by-step explanation:
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Saving/restoring register values: When a subroutine is called, it may need to use some of the CPU's registers, which might already be in use. To prevent data loss, the subroutine saves these register values to the stack before using them. When the subroutine is done, it restores the saved values from the stack back to the registers.
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Passing parameters to other subroutines: Parameters that are passed to a subroutine are often placed on the stack. The subroutine can then pop these values off the stack to use them.
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Storing local variables that don't fit into registers: If a subroutine has more local variables than there are registers, it can use the stack to store these extra variables.
Similar Questions
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.
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
If a WRAMP subroutine takes three parameters, what will the stack pointer be pointing at when that subroutine is first entered (i.e. before any instructions have been executed)?Question 11Select one:a.The first parameter.b.The last (third) parameter.c.The return address.d.The first instruction.
6. Which of the following is not the application of stack?a) A parentheses balancing programb) Tracking of local variables at run timec) Compiler Syntax Analyzerd) Data Transfer between two asynchronous process
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