s.section __TEXT,__text,regular,pure_instructions
.build_version macos, 12, 0 sdk_version 12, 3
.globl _main ## -- Begin function main
.p2align 4, 0x90
_main: ## @main
.cfi_startproc
## %bb.0:
pushq %rbp
.cfi_def_cfa_offset 16
.cfi_offset %rbp, -16
movq %rsp, %rbp
.cfi_def_cfa_register %rbp
subq $80, %rsp
movq ___stack_chk_guard@GOTPCREL(%rip), %rax
movq (%rax), %rax
movq %rax, -8(%rbp)
movl $0, -68(%rbp)
leaq L_.str(%rip), %rdi
movb $0, %al
callq _printf
leaq -64(%rbp), %rsi
leaq L_.str.1(%rip), %rdi
movb $0, %al
callq _scanf
leaq L_.str.2(%rip), %rdi
movb $0, %al
callq _printf
leaq L_.str.3(%rip), %rdi
leaq -72(%rbp), %rsi
movb $0, %al
callq _scanf
imull $7, -72(%rbp), %eax
movl %eax, -76(%rbp)
movl $2022, %ecx ## imm = 0x7E6
subl -72(%rbp), %ecx
movl $2100, %eax ## imm = 0x834
subl %ecx, %eax
movl %eax, -80(%rbp)
leaq -64(%rbp), %rsi
movl -76(%rbp), %edx
leaq L_.str.4(%rip), %rdi
movb $0, %al
callq _printf
leaq -64(%rbp), %rsi
movl -80(%rbp), %edx
leaq L_.str.5(%rip), %rdi
movb $0, %al
callq _printf
movq ___stack_chk_guard@GOTPCREL(%rip), %rax
movq (%rax), %rax
movq -8(%rbp), %rcx
cmpq %rcx, %rax
jne LBB0_2
## %bb.1: ## %SP_return
xorl %eax, %eax
addq $80, %rsp
popq %rbp
retq
LBB0_2: ## %CallStackCheckFailBlk
callq ___stack_chk_fail
ud2
.cfi_endproc
## -- End function
.section __TEXT,__cstring,cstring_literals
L_.str: ## @.str
.asciz "What is your name? "
L_.str.1: ## @.str.1
.asciz "%s"
L_.str.2: ## @.str.2
.asciz "How old are you? "
L_.str.3: ## @.str.3
.asciz "%d"
L_.str.4: ## @.str.4
.asciz "%s is %d dog years old. \n"
L_.str.5: ## @.str.5
.asciz "%s will be %d years old in the year 2100. \n"
.subsections_via_symbols
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