Hello, I'm new on assembly and am having problems with a program I am trying to create. The program is supposed to accept 3 inputs from the user which include an arithmetic operation and 2 numbers. The program should then pass the three values and display the answer with a message. I am having trouble getting the program to jump properly as it would display the 2 numbers being used for all the operations and then abruptly end the program instead of just showing the operation the user picked and asking the user if they would like to do another one. Does anyone know how I can solve this problem? Thanks!
Here is the code:
%include "CPsub64.inc"
global main, sum, minus, multi, divi ;entry point for assembly
section .text
main:
mov rcx, 1
mov rdi, 1
loop2:
;display
mov rax, 1
mov rsi, message
mov rdx, length
syscall
;take input
mov rdx, 255
mov rcx, userInput1
mov rbx, 0
mov rax, 3
int 80h
;display
mov rax, 1
mov rsi, message1
mov rdx, length1
syscall
;take input
mov rdx, 255
mov rcx, userInput2
mov rbx, 0
mov rax, 3
int 80h
;convert to number
mov rdx, userInput2
mov rcx, 255
call ParseInteger64
mov r8, rax
;display
mov rax, 1
mov rsi, message2
mov rdx, length2
syscall
;take input
mov rdx, 255
mov rcx, userInput3
mov rbx, 0
mov rax, 3
int 80h
;convert to number
mov rdx, userInput3
mov rcx, 255
call ParseInteger64
mov r9, rax
;save registers
push rax
mov r10, r8
push r8
push r9
call sum
push rax
mov r10, r8
push r8
push r9
call minus
push rax
mov r10, r8
push r8
push r9
call multi
push rax
mov r10, r8
push r8
push r9
call divi
;Set up operator
mov rsi, 0
mov rsi, [userInput1]
push rsi
cmp sil, '+'
je add
mov rsi, 0
mov rsi, [userInput1]
cmp sil, '-'
mov rsi, 0
mov rsi, [userInput1]
cmp sil, '*'
mov rsi, 0
mov rsi, [userInput1]
cmp sil, '/'
; jump if addition
cmp sil, '+'
; jump if subtraction
cmp sil, '-'
push rsi
je subtract
; jump if multiplication
cmp sil, '*'
push rsi
je multiply
; jump if division
cmp sil, '/'
push rsi
je divide
;add
add:
add rsp, 24
;exit
mov rax, 60
xor rdi, rdi
syscall
sum:
;prologue
push rbp
mov rbp, rsp
push rbx
mov r10, r8
add r10, r9
;display
mov rax, r8
call WriteInt
syscall
;display
mov rax, 1
mov rsi, messageadd
mov rdx, lengthadd
syscall
;display
mov rax, r9
call WriteInt
syscall
;display
mov rax, 1
mov rsi, messageeq
mov rdx, lengtheq
syscall
;display answer
mov rbx, [rbp + 16]
mov rax, [rbp + 24]
add rax, rbx
call WriteInt
;blank
mov rax, 1
mov rsi, blank1
mov rdx, lengthblank
syscall
;blank
mov rax, 1
mov rsi, blank1
mov rdx, lengthblank
syscall
;display
mov rax, 1
mov rsi, messageanswer
mov rdx, lengthanswer
syscall
;display answer
mov rax, r10
call WriteInt
;blank
mov rax, 1
mov rsi, blank1
mov rdx, lengthblank
syscall
;prepare return to main
pop rbx
pop rbp
ret
jmp loop
;subtract
subtract:
add rsp, 24
;exit
mov rax, 60
xor rdi, rdi
syscall
minus:
;prologue
push rbp
mov rbp, rsp
push rbx
mov r10, r8
sub r10, r9
;display
mov rax, r8
call WriteInt
syscall
;display
mov rax, 1
mov rsi, messagesub
mov rdx, lengthsub
syscall
;display
mov rax, r9
call WriteInt
syscall
;display
mov rax, 1
mov rsi, messageeq
mov rdx, lengtheq
syscall
;display answer
mov rax, r10
call WriteInt
;blank
mov rax, 1
mov rsi, blank1
mov rdx, lengthblank
syscall
;display
mov rax, 1
mov rsi, messageanswer
mov rdx, lengthanswer
syscall
;display answer
mov rbx, [rbp + 16]
mov rax, [rbp + 24]
sub rax, rbx
call WriteInt
;blank
mov rax, 1
mov rsi, blank1
mov rdx, lengthblank
syscall
;prepare return to main
pop rbx
pop rbp
ret
jmp loop
;multiply
multiply:
add rsp, 24
;exit
mov rax, 60
xor rdi, rdi
syscall
multi:
;prologue
push rbp
mov rbp, rsp
push rbx
mov rax, r8
mov rax, r9
mul rax
;display
mov rax, r8
call WriteInt
syscall
;display
mov rax, 1
mov rsi, messagemul
mov rdx, lengthmul
syscall
;display
mov rax, r9
call WriteInt
syscall
;display
mov rax, 1
mov rsi, messageeq
mov rdx, lengtheq
syscall
;display answer
mov rax, r8
mov rsi, r9
mul rsi
call WriteInt
;blank
mov rax, 1
mov rsi, blank1
mov rdx, lengthblank
syscall
;display
mov rax, 1
mov rsi, messageanswer
mov rdx, lengthanswer
syscall
;display answer
mov rbx, [rbp + 16]
mov rax, [rbp + 24]
mul rbx
call WriteInt
;blank
mov rax, 1
mov rsi, blank1
mov rdx, lengthblank
syscall
;prepare return to main
pop rbx
pop rbp
ret
jmp loop
;divide
divide:
add rsp, 24
;exit
mov rax, 60
xor rdi, rdi
syscall
divi:
;prologue
push rbp
mov rbp, rsp
push rbx
mov rdx, 0
mov rax, r8
mov rax, r9
div rax
;display
mov rax, r8
call WriteInt
syscall
;display
mov rax, 1
mov rsi, messagediv
mov rdx, lengthdiv
syscall
;display
mov rax, r9
call WriteInt
syscall
;display
mov rax, 1
mov rsi, messageeq
mov rdx, lengtheq
syscall
;display answer
mov rdx, 0
mov rax, r8
mov rsi, r9
div rsi
call WriteInt
;blank
mov rax, 1
mov rsi, blank1
mov rdx, lengthblank
syscall
;display
mov rax, 1
mov rsi, messageanswer
mov rdx, lengthanswer
syscall
;display answer
mov rbx, [rbp + 16]
mov rax, [rbp + 24]
mov rdx, 0
div rbx
call WriteInt
;blank
mov rax, 1
mov rsi, blank1
mov rdx, lengthblank
syscall
;prepare return to main
pop rbx
pop rbp
ret
jmp loop
loop:
;blank
mov rax, 1
mov rsi, blank1
mov rdx, lengthblank
syscall
;blank
mov rax, 1
mov rsi, blank1
mov rdx, lengthblank
syscall
;display
mov rax, 1
mov rsi, message3
mov rdx, length3
syscall
;take input
mov rdx, 255
mov rcx, userInput4
mov rbx, 0
mov rax, 3
int 80h
mov rsi, 0
mov rsi, [userInput4]
cmp sil, 'y'
;jump if answer is yes
cmp sil, 'y'
je loop2
;blank
mov rax, 1
mov rsi, blank1
mov rdx, lengthblank
syscall
;exit
mov rax, 60
xor rdi, rdi
syscall
section .data
;addition message
message: db "Enter the arithmetic operator (+ - * /):",0,0ah
length: equ ($-message)
message1: db "Please enter the 1st number",0,0ah
length1: equ ($-message1)
message2: db "Please enter the 2nd number",0,0ah
length2: equ ($-message2)
messageadd: db " + ",0
lengthadd: equ ($-messageadd)
messagesub: db " - ",0
lengthsub: equ ($-messagesub)
messagemul: db " * ",0
lengthmul: equ ($-messagemul)
messagediv: db " / ",0
lengthdiv: equ ($-messagediv)
messageeq: db " = ",0
lengtheq: equ ($-messageeq)
messageanswer: db "The answer is: ",0
lengthanswer: equ ($-messageanswer)
message3: db "Would you like to perform another operation? [y = yes / n = no]",0,0ah
length3: equ ($-message3)
blank1: db " ",0,0ah
lengthblank: equ ($-blank1)
;user inputs
section .bss
userInput1: resb 255
userInput2: resb 255
userInput3: resb 255
userInput4: resb 255
