3. Assemble the following assembly-language code by writing out the correspondin

Question

3. Assemble the following assembly-language code by writing out the corresponding machine language instructions. The hex address of each instruction is given to the left of each instruction. Print this page and fill in the decimal values for each field, convert to binary, and then convert the whole instruction to hexadecimal. The first one is done for you as an example. For longer fields, such as the immediate data in I-type instructions, draw a line connecting the fields, such as17_-, 2000 slt $s1, $s2, $s3 Instruction breakdown by binary bit 5 bits 6 bits 5 bits 6 bits 4 2 5 bits 5 bits Dec Bin lol0lolo 0/0110 01 01110 011 100 0110l0l0l0 01110110110 Hex 2 3 2 2004 and Sto, Ss3, St4 Instruction breakdown by binary bit 5 bits 6 bits 5 bits 5 bits 5 bits 6 bits Dec Bin Hex 2008 add to, $t4, $s0 Dec Bin Hex 200C addi St1, St2, 1234 #1234 is a decimal number Dec Bin Hex 2010 lw Ss4, 200($t2) #200 is a decimal number Dec Bin Hex

Explanation / Answer

3.)

and $t0, $s3, $t4

R type instruction:

Format: AND rd, rs, rt

Most significant 6 bits corresponds to R type: 000000

least significant 6 bits corresponds to and instruction: 100100

rs = $s3 = 10011, rt = $t4 = 01100, rd = $t0 = 01000, shamt = 00000

Binary = 000000 10011 01100 01000 00000 100100

Decimal = 0 19 12 8 0 36

HexaDecimal = 0 2 6 C 4 0 2 4 = 0x026C4024

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add $t0, $t4, $s0

R type instruction:

Format: ADD rd, rs, rt

Most significant 6 bits corresponds to R type: 000000

least significant 6 bits corresponds to add instruction: 100000

rs = $t4 = 01100, rt = $s0 = 10000, rd = $t0 = 01000, shamt = 00000

Binary = 000000 01100 10000 01000 00000 100000

Decimal = 0 12 16 8 0 32

HexaDecimal = 0 1 9 0 4 0 2 0 = 0x01904020

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.

addi $t1, $t2, 1234

I type instruction:

Format: ADDI rt, rs, immediate
Most significant 6 bits corresponds to addi = 001000

rs = $t2 = 01010

rd = $t1 = 01001

1234 is in 16 bits: 0000 0100 1101 0010

Binary = 001000 01010 01001 0000010011010010

Decimal = 8 10 9 ---1234---

Hexadecimal = 2 1 4 9 0 4 D 2 = 0x214904D2

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lw $s4, 200($t2)

I type instruction

Format: LW rt, offset(base)
Most significant 6 bits corresponds to lw: 100011

base = $t2 = 01010

rt = $s4 = 10100

200 in 16 bits = 0000 0000 1100 1000

Binary = 100011 01010 10100 0000000011001000

Decimal = 35 10 20 ---200---

HexaDecimal = 8 D 5 4 0 0 C 8 = 0x8D5400C8

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