%macro scall 4
mov rax,%1
mov rdi,%2
mov rsi,%3
mov rdx,%4
syscall
%endmacro
section .data
m1 db "Enter Count of numbers: ",10
l1 equ $-m1
m2 db "Enter the numbers: ",10
l2 equ $-m2
m3 db "Largest Number is: ",10
l3 equ $-m3
m4 db " ",10
l4 equ $-m4
m5 db "Array Elements are: ",10
l5 equ $-m5
section .bss
cnt resb 3
arr resb 17
cnt1 resb 3
cnt2 resb 3
arr1 resb 100
temp resq 1
char_ans resb 16
section .text
global _start
_start:
;accept count
scall 1,1,m1,l1
scall 0,0,arr,3
mov rsi,arr
mov rcx,2
mov rdx,0
up:
rol dl,4
mov al,[rsi]
cmp al,39h
jbe L1
sub al,07h
L1:
sub al,30h
add dl,al
inc rsi
loop up
mov byte[cnt],dl
mov byte[cnt1],dl
mov byte[cnt2],dl
;accept array
scall 1,1,m2,l2
mov rbx,arr1
back:
scall 0,0,arr,17
mov rsi,arr
mov rcx,16
mov rdx,0
mov rax,0
up1:
rol rdx,4
mov al,[rsi]
cmp al,39h
jbe L2
sub al,07h
L2:
sub al,30h
add rdx,rax
inc rsi
dec rcx
jnz up1
mov [rbx],rdx
add rbx,17
dec byte[cnt]
jnz back
;***********Displaying array elements*********************
scall 1,1,m5,l5
mov rbx,arr1
up4:
mov rcx,16
mov rsi,char_ans
mov rax,[rbx]
up6:
rol rax,4
mov dl,al
and dl,0Fh
cmp dl,09h
jbe nxt1
add dl,07h
nxt1:
add dl,30h
mov [rsi],dl
inc rsi
dec rcx
jnz up6
scall 1,1,char_ans,16
scall 1,1,m4,l4
add rbx,17
dec byte[cnt2]
jnz up4
;*******************Finding Largest Number**********************************
mov rsi,arr1
mov rax,[rsi]
add rsi,17
up2:
mov rbx,[rsi]
cmp rax,rbx
jg next
mov [temp],rax
mov rax,rbx
mov rbx,[temp]
next:
add rsi,17
dec byte[cnt1]
jnz up2
;***************************Displaying Largest Number*****************************
mov rcx,16
mov rsi,char_ans
up3:
rol rax,4
mov dl,al
and dl,0fh
cmp dl,09h
jbe nxt
add dl,07h
nxt:
add dl,30h
mov [rsi],dl
inc rsi
dec rcx
jnz up3
scall 1,1,m3,l3
scall 1,1,char_ans,16
scall 1,1,m4,l4
mov rax,60
mov rbx,0
syscall Write, Run & Share Assembly code online using OneCompiler's Assembly online compiler for free. It's one of the robust, feature-rich online compilers for Assembly language. Getting started with the OneCompiler's Assembly compiler is simple and pretty fast. The editor shows sample boilerplate code when you choose language as Assembly and start coding.
Assembly language(asm) is a low-level programming language, where the language instructions will be more similar to machine code instructions.
Every assembler may have it's own assembly language designed for a specific computers or an operating system.
Assembly language requires less execution time and memory. It is more helful for direct hardware manipulation, real-time critical applications. It is used in device drivers, low-level embedded systems etc.
Assembly language usually consists of three sections,
Data section
To initialize variables and constants, buffer size these values doesn't change at runtime.
bss section
To declare variables
text section
_start specifies the starting of this section where the actually code is written.
There are various define directives to allocate space for variables for both initialized and uninitialized data.
variable-name define-directive initial-value
| Define Directive | Description | Allocated Space |
|---|---|---|
| DB | Define Byte | 1 byte |
| DW | Define Word | 2 bytes |
| DD | Define Doubleword | 4 bytes |
| DQ | Define Quadword | 8 bytes |
| DT | Define Ten Bytes | 10 bytes |
| Define Directive | Description |
|---|---|
| RESB | Reserve a Byte |
| RESW | Reserve a Word |
| RESD | Reserve a Doubleword |
| RESQ | Reserve a Quadword |
| REST | Reserve a Ten Bytes |
Constants can be defined using
CONSTANT_NAME EQU regular-exp or value
%assign constant_name value
%define constant_name value
Loops are used to iterate a set of statements for a specific number of times.
mov ECX,n
L1:
;<loop body>
loop L1
where n specifies the no of times loops should iterate.
Procedure is a sub-routine which contains set of statements. Usually procedures are written when multiple calls are required to same set of statements which increases re-usuability and modularity.
procedure_name:
;procedure body
ret