Question: I have been tasked with writing an LC 3 assembly language program that can add 2 numbers with up to 4 digits. The code I

I have been tasked with writing an LC

3

assembly language program that can add

2

numbers with up to

4

digits. The code I have works in online LC

3

simulators, but when I load the obj file in the LC

3

sim on my computer it doesnt run. It creates TRAP #

34

and

37

instructions that crash the program. I dont know why this happens and how to fix it

.

Ill provide the code but Im unsure if its an issue with the code or my simulator.

heres my code:

.

ORIG x

3000

num

_

.

FILL #

0

num

_

.

FILL #

0

num

_

temp

.

FILL #

0

RunProgram

JSR ClearRegisters

JSR ClearOutputArray

AND R

0,

0,

0

ST R

0,

num

_

LEA R

0,

prompt

1

; loads prompt

1

into R

0

PUTS ; prints to console

JSR ReadInput ;runs subroutine to read the input from user

LD R

1,

num

_

temp

ST R

1,

num

_

; reset temp variable

AND R

0,

0,

0

ST R

0,

num

_

temp

; Get second number

LEA R

0,

prompt

2

PUTS

JSR ReadInput

LD R

2,

num

_

temp

ST R

2,

num

_

AND R

0,

0,

0

ST R

0,

num

_

temp

; prompt for operator

LEA R

0,

prompt

3

PUTS

; get operator

GETC ; Character is stored in R

0

OUT

AND R

6,

6,

0

LD R

1,

num

_

LD R

2,

num

_

LEA R

5,

codesArray ; load codesArray address

LDR R

3,

5,

0

; loads first symbol from R

7

into R

3

ADD R

4,

0,

3

; add contents of R

0 (

user input

)

and R

3

BRz Addition

LDR R

3,

5,

3

ADD R

4,

0,

3

BRz DivisionF

OpComplete

LEA R

0,

result

1

PUTS

ADD R

6,

6,

0

Brn printNeg

ST R

6,

num

_

JSR DetermineSize

JSR NumToASCII

LEA R

0,

outputArray

PUTS

LEA R

0,

endStrg

PUTS

GETC

OUT

LD R

5,

minus

30

ADD R

0,

0,

5

Brz RunProgram

; End of program

HALT

num

_

.

FILL #

0

prompt

1 .

STRINGZ

"

Input first number:

"

prompt

2 .

STRINGZ

"

Input second number:

"

prompt

3 .

STRINGZ

"

Input operation

(+, /)

"

result

1 .

STRINGZ

"

Result

= "

endStrg

.

STRINGZ

"

Restart?

0

for YES,

1

for NO:

"

codesArray

.

FILL #

- 43

;

' +'

.

FILL #

- 47

;

' /'

;

- - - - - - - - -

Subroutines Start

- - - - - - - - -

;

; R

1 < -

; R

2 < -

; R

6 < -

result of X

(

operation

)

; Use R

3,

4,

& R

5

for extra stuff

;

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

;

ReadInput

ST R

7,

saveR

7

LEA R

3,

inputArray ; R

3 < -

pointer to inputArray

AND R

4,

4,

0

; init R

4

0

AND R

5,

5,

0

; init R

5

0

LoopReadInput GETC

ADD R

6,

0,

- 10

; check for return key

BRz DoneReadInput

OUT ; print character to screen

STR R

0,

3,

0

; store char into inputArray

ADD R

4,

4,

1

; inc

+ +

size value

ST R

4,

inputSize ; store R

4

into inputSize variable

ADD R

3,

3,

1

; inc

+ +

array index

ADD R

5,

4,

- 4

; stop when

4

char long

BRn LoopReadInput ; loop back for next character

DoneReadInput

LEA R

3,

inputArray ; R

3 < -

pointer to inputArray

LEA R

4,

constArray ; R

4 < -

pointer to constArray

LD R

5,

minus

30

; R

5 < -

contains hex

30

LD R

6,

inputSize ; R

6 < -

contains length of input

ADD R

6,

6,

- 1

; length

- 1

LoopReadInput

2

LDR R

1,

3,

0

; load ASCII digit from inputArray

ADD R

1,

1,

5

; R

1 < -

contains integer

ADD R

2,

4,

6

; R

2 < -

contins address of constant

LDR R

2,

2,

0

; R

2 < -

load the number from the arrary

JSR ReadInputExpand ; R

1 < -

Integer, R

2 < -

Constant

LD R

1,

num

_

R ; Load mult result into R

1

LD R

0,

num

_

temp ; Load the current num into R

0

ADD R

0,

0,

1

; Add together

ST R

0,

num

_

temp ; Store the sum back into the temp num

ADD R

3,

3,

1

; increment pointer in inputArray

ADD R

6,

6,

- 1

; decrement size

BRzp LoopReadInput

2

; loop back and continue to multiply out

LD R

7,

saveR

7

RET

minus

30 .

FILL x

- 30

inputArray

.

BLKW #

5

ReadInputExpand

ST R

6,

saveR

6

ST R

4,

saveR

4

AND R

6,

6,

0

AND R

4,

4,

0

ADD R

4,

4,

2

; duplicate R

2

so it remains unchanged

Mult

ADD R

6,

6,

1

ADD R

4,

4,

- 1

BRp Mult

ST R

6,

num

_

LD R

4,

saveR

4

LD R

6,

saveR

6

RET

NumToASCII ; prints number in R

1

ST R

7,

saveR

7

LD R

3,

outputSize ; load size into R

3

LEA R

6,

outputArray ; load address of output into R

6

Convert

_

Loop

LEA R

5,

constArray ; load address of constArray

- >

5

ADD R

3,

3,

- 1

; decrement size of num

ADD R

5,

5,

3

; R

5 < -

5 +

3

LDR R

2,

5,

0

; load const from constArray at index R

5

LD R

1,

num

_

R ; load the number into R

1

ST R

3,

saveR

3

ST R

4,

saveR

4

ST R

5,

save

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