Question

Assume that src1 DCD 0xFF00FF00 and src2 DCD 0x00AA00AA are located

consecutively in the READONLY area of memory. Also, assume that src1 starts at

address 0x00000008 and SP= 0x20000400. For each of the following instructions,

calculate the values of registers involved. Draw the status of the STACK area of

memory for those instructions where we use it.



LDR R0 , = src 1

ADD R0 , #1

LDR R1 , [R0]

PUSH {R1}

ADD R0 , #4

LDRSH R2 , [R0]

PUSH {R2}

MOV R3, SP

ADD R3 , #3

LDR R4 , [R3]

SUB R4, #0x004C004C

STR R4 , [R3]

POP {R2}

POP {R1}​

Answer 1

consecutively in the READONLY area of memory. Also, assume that src1 starts at

address 0x00000008 and SP= 0x20000400. For each of the following instructions,

calculate the values of registers involved. Draw the status of the STACK area of

memory for those instructions where we use it.

LDR R0 , = src 1

ADD R0 , #1

LDR R1 , [R0]

PUSH {R1}

ADD R0 , #4

LDRSH R2 , [R0]

PUSH {R2}

MOV R3, SP

ADD R3 , #3

LDR R4 , [R3]

SUB R4, #0x004C004C

STR R4 , [R3]

POP {R2}

POP {R1}