1. Use the following program for this question data .halfword 7, 3 num: .word 9

Question

1. Use the following program for this question data .halfword 7, 3 num: .word 9 globl .text main mairn lui t0, 0x1001 top: lw $t1, -4 ($t0) beq $s0, $s2, end jal func add $s0, $s1, $t0 andi $s0, $0, 0xFFFF top bne $s0, $0, top end: func sll $v0, $t1, 4 ra a. There are 5 labels in this code. If the .data section starts at 0x10010000 and the .text starts at Ox00400400, what is the value of each label? Include all labels from the program. 2.5 points b. What is the addressing mode for each instruction? There are 10 unique instructions. 2.5 points c. "Assemble" the program by converting it to the machine code (hex). 15 points

Explanation / Answer

Answer :

a) The above program has five labels :- num,main,top,end and func

      Values of label:-

       num=0x10010004

       main=0x00400400

     top=0x00400404

      end=0x00400420

      func=0x00400420

Since, labels always replaced with the memory address .

b) Addressing modes:-

   lui $t0,0x1001 :- Immediate addressing mode.

   lw $t1,-4($t0) :- Base addressing mode

beq $s0,$s2,end :- PC relative addressing mode

jal func :- pseudo direct addressing mode

add $s0,$s1,$t0 :- Register addressing mode

andi $s0,$0,0xFFFF :- Immediate adressing model

j top :- pseudo direct addressing mode

bne $s0,$0,top :- PC relative addressing mode

sll 4v0,$t1,4 :- Immediate adressing model

jr $ra :- Register direct addressing mode

c) machine code in hex

lui $t0,0x1001 --> 0x3c081001

   lw $t1,-4($t0) --> 0x8d09fffc

beq $s0,$s2,end --> 0x12120005

jal func --> 0x0c100008

add $s0,$s1,$t0 --> 0x02288020

andi $s0,$0,0xFFFF -- >0x3010ffff

j top --> 0x081000001

bne $s0,$0,top--> 0x1600fff9

sll 4v0,$t1,4 --> 0x00091100

jr $ra --> 0x03e00008

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