; nasm -f elf64 main.asm && gcc -no-pie main.o && ./a.out
global main
extern printf
extern scanf
extern puts
section .text
main:
; exibe msg ap1
mov rdi, msgAp1
call puts
; scanf
mov rdi, formatin
mov rax, 1
sub rsp,8
call scanf
add rsp,8
movsd [ap1], xmm0
; msg ap2
mov rdi, msgAp2
call puts
;scanf
mov rdi, formatin
mov rax, 1
sub rsp, 8
call scanf
add rsp, 8
movsd [ap2], xmm0
; soma ap1 + ap2 e / por 2
movsd xmm0, [ap1]
addsd xmm0, [ap2]
movsd xmm1, [_2]
divsd xmm0, xmm1
movsd [media], xmm0
;verifica se media >= 8
mov rax, [media]
cmp rax,[_8]
jge aprovado ; ***** pra aprovado
cmp rax, [_4] ; verifica se menor que 4 e ja reprova direto
jl reprovado
mov rdi, msgPF ; msg pf
call puts
mov rdi, formatin ; scanf pf
mov rax, 1
sub rsp, 8
call scanf
add rsp, 8
movsd [pf], xmm0
movsd xmm0, [ap1] ; soma ap1 + ap2 + pf
addsd xmm0, [ap2]
addsd xmm0, [pf]
movsd xmm1, [_3]
divsd xmm0, xmm1
movsd [media], xmm0
mov rax, [media] ; verifica se >= 6
cmp rax,[_6]
jge aprovado
jmp reprovado ; nao deu
jmp fim
aprovado:
mov rdi, msgAprovado
call puts
jmp fim
reprovado:
mov rdi, msgReprovado
call puts
jmp fim
fim:
mov rdi, msgMedia
movsd xmm0, [media]
mov rax, 1
sub rsp, 8
call printf
add rsp, 8
ret
section .data
msgAp1: db "Digite a nota da AP1", 0
msgAp2: db "Digite a nota da Ap2", 0
msgPF: db "Digite a nota da PF", 0
msgAprovado: db "Aprovado", 0
msgReprovado: db "Reprovado", 0
msgMedia: db "media: %.2f",10, 0
formatin: db "%lf", 0
ap1: dq 0.0
ap2: dq 0.0
pf: dq 0.0
media: dq 0.0
_2: dq 2.0
_3: dq 3.0
_4: dq 4.0
_6: dq 6.0
_8: dq 8.0 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