Unable to store my result back to the memory

I wrote a simple code to add 3 numbers and store the result back in the memory. I tried to store the the 3 numbers in memory, retrieve it back using ADRL instruction and store it back.  My code is working and I get the result but I am unable to store it to the desired location. The code below shows what I did:

AREA Addition,CODE,READONLY
		ENTRY
		EXPORT __main
__main
		ADRL	R4,Vals		;R4 points to Value area
		LDR 	R1,[R4,#Q]
		LDR 	R2,[R4,#R]                                                            
		LDR 	R3,[R4,#S]
		
		ADD		R0,R1,R2
		ADD		R0,R0,R3
		STR 	R0,[R4,#P]
STOP	
		B		STOP			
		
P 		EQU		0
Q		EQU		4
R		EQU		8
S		EQU		12
		
		AREA Addition,DATA,READWRITE
			
Vals	SPACE	4
		DCD		2 				;reserving 32bits in M/M and initializing it with 2
		DCD 	4
		DCD		5
			
		ALIGN
		
		END

Could someone please point out where I am doing wrong.

Thanks!