exit_x86-linux-att.c

// exit_x86-linux-att.c - inline exit() shellcode

static void exit()
{
    __asm__(".att_syntax prefix");

    __asm__ volatile(
        "xor %eax,%eax \n"  //zero out eax, no null
        "xor %ebx,%ebx \n"  //zero out ebx, no null"
        "mov $42,%bl   \n"  //return code is 42"
        "mov $1,%al    \n"  //exit is syscall 1"
        "int $0x80     \n"  //syscall interrupt"
    );
}

int main()
{
    exit();
}