Here's a step$-$by$-$step breakdown of what your code does:

$$ initialize the Stack Pointer $($SP$)$ to $0$x$20008000$ address, which represents the top of the stack.

$$ Load some arbitrary values into registers R$0$ to R$2.$

$$ Push these register values onto the stack.

$$ Clear the values in R$0$ to R$2($assign zeros to this registers$)$ using MOV.

$$ Pop values off the stack back into R$0$ to R$2.$ At this point, R$0$ to R$2$ will hold their original values, demonstrating

that the stack has stored and restored them correctly.

$$ Finally, there's an infinite loop to halt the program