Q3. Demonstrate the process of executing a nested subroutine, where you will have three subroutines. Subroutine...

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Electrical Engineering

Q3. Demonstrate the process of executing a nested subroutine,where you will have three subroutines. Subroutine number 2 will becalled from subroutine number 1, while subroutine number 3 will becalled from subroutine number 2. In Keil uVision, screenshot yourresult, by showing the value of PC and LR. Discuss your results byrelating the values in PC, LR and stack for each subroutine call.

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Example:Example:

AREA subrout, CODE, READONLYÂ Â Â Â ; Name this block of code

ENTRYÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â ; Mark first instruction to execute

startÂ Â MOVÂ Â Â Â r0, #10 ; Set up parameters
Â Â Â Â Â Â Â Â Â Â MOVÂ Â Â Â r1, #3

Â Â Â Â Â Â Â Â Â Â BLÂ Â Â Â Â doaddÂ Â ;

Call subroutine

stopÂ Â Â MOVÂ Â Â Â r0, #0x18Â Â Â Â Â Â Â Â ; angel_SWIreason_ReportException

LDRÂ Â Â Â r1, =0x20026Â Â Â Â Â ; ADP_Stopped_ApplicationExit

SVCÂ Â Â Â #0x123456Â Â Â Â Â Â Â Â ; ARM semihosting (formerly SWI)

doaddÂ Â ADDÂ Â Â Â r0, r0, r1Â Â Â Â Â Â Â ; Subroutine code
Â Â Â Â Â Â Â BXÂ Â Â Â Â lrÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â ; Return from subroutine
Â Â Â Â Â Â Â ENDÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â ; Mark end of file

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