puts 어셈블리 프로그래밍

.globl main

main:

push %ebp

mov %esp, %ebp

mov $helloworld, %ebx

call strlen

call puts

leave

ret

puts:

push %ebp

mov %esp, %ebp

mov 0x8(%ebp), %ecx

push %ecx

call strlen

mov 0x8(%ebp), %ecx

mov %eax, %edx

mov %ecx, %esi

add %esi, %edx

movb $0x0a, (%esi)

inc %edx 

mov $4, %eax

mov $1, %ebx

mov $helloworld, %ecx

mov $14, %edx

int $0x80

leave

ret

strlen:

push %ebp

mov %esp, %ebp

mov 0x8(%ebp), %eax

mov $0x0, %ecx

call l1

leave

ret

l1:

movb (%eax), %bl

cmpb $0x0, %bl 

je .finished

inc %ecx

inc %eax

loop l1

.finished:

mov %ecx, %eax

leave

ret

이상하게도 세그먼트 폴트가나는데 계속해서 수정해봐야겠다