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アセンブラからcの関数

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概要

アセンブラからcの関数、呼び出して見た。

サンプルコード

import subprocess
import os

def gcc():
    s_file = 'main.s'
    test_s = """
.code32
.text
.extern test
.global main
main:
    call    test
    mov     $4, %eax
    mov     $1, %ebx
    mov     $msg, %ecx
    mov     $6, %edx
    int     $0x80
    ret
.data
msg:
    .ascii  "hello "
"""
    with open(s_file, 'w') as f:
        f.write(test_s)
    c_file = 'test.c'
    test_c = """
#include <stdio.h>  
void test()
{
    printf("world!");
}
"""
    with open(c_file, 'w') as f:
        f.write(test_c)
    os.system("gcc -no-pie test.c main.s")
    os.system("./a.out")

if __name__ == '__main__':
    gcc()




成果物

以上。

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