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アセンブラAdvent Calendar 2018

Day 24

paizaでアセンブラ その4

Last updated at Posted at 2018-12-06

#概要

paizaでアセンブラ、やってみた。
gas調べたら、printf使えた。

#サンプルコード
1から100を表示

import subprocess
import os

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

main:
	sub 	$8, %rsp
	mov 	$1, %r8
loop:
	mov 	$0, %r10
	mov 	$0, %rdx
	mov 	%r8, %rax
	lea 	mat(%rip), %rdi
	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
mat:
	.asciz "%i "
"""
    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。

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