Q6b

In a certain computer system, there is special instruction implemented to call subroutines. The instruction is JSR Reg.Sub Microsequence: Temp ← Sub SP ← (SP)+2 (SP) ← (Reg) Reg ← (PC) PC ← (Temp) Where Temp is an internal CPU register Sub is calling routine address specification Reg is any register in the system SP is stack pointer PC is program counter (SP) refers to the contents of SP. The system supports indirect addressing and autoincrement addressing modes. PC can be used as a link register. Sub field in the JSR instruction allows any operand specification, including the use of stack pointer along with some addressing modes. Explain how you would implement co-routine using the JSR instruction. Show the control flow diagram and the contents of the stack before and after the call.