paizaでアセンブラ その５

#概要

paizaでアセンブラ、やってみた。
gas調べたら、printf使えた。
fizzbuzzやってみた。

#サンプルコード

import subprocess
import os

def gcc():
    c_file = 'fizzbuzz.s'
    test_c = """
.code64
.text
.global main

main:
	sub 	$8, %rsp
	mov 	$1, %r8
loop:
	mov 	$0, %r10
	mov 	$0, %rdx
	mov 	%r8, %rax
	mov 	$3, %rsi
	div 	%esi
	cmp 	$0, %rdx
	jne 	skip1
	add 	$1, %r10
skip1:
	mov 	$0, %rdx
	mov 	%r8, %rax
	mov 	$5, %rsi
	div 	%esi
	cmp 	$0, %rdx
	jne 	skip2
	add 	$2, %r10
skip2:
	cmp 	$0, %r10
	je 		printNum
	cmp 	$2, %r10
	jb 		printFizz
	je 		printBuzz
	ja 		printFizzBuzz
printNum:
	lea 	num(%rip), %rdi
	jmp 	loope
printFizz:
	lea 	fizz(%rip), %rdi
	jmp 	loope
printBuzz:
	lea 	buzz(%rip), %rdi
	jmp 	loope
printFizzBuzz:
	lea 	fizzbuzz(%rip), %rdi
loope:
	mov 	$1, %rax
	mov 	%r8, %rsi
	push 	%r8
	push 	%r10
	call 	printf
	pop 	%r10
	pop 	%r8
	add 	$1, %r8
	cmp 	$101, %r8
	jne 	loop
	add 	$8, %rsp
	ret
.data
num:
	.asciz "%i "
fizz:
	.asciz "Fizz "
buzz:
	.asciz "Buzz "
fizzbuzz:
	.asciz "FizzBuzz "	
"""
    with open(c_file, 'w') as f:
        f.write(test_c)
    os.system("gcc -no-pie %s" % c_file)
    result = subprocess.Popen('./a.out', stdout = subprocess.PIPE).communicate()[0]
    for i, v in enumerate(result[ : -1].split('\n')):
        print v

if __name__ == '__main__':
  gcc()
  

#成果物

以上。