djgpp gpp传递变量内联汇编

Question

使用DJGPP与编译器gpp和intel语法
如何将变量传递给内联汇编？ 错误如下：
对“n＆＃39; 的未定义引用”
代码：

use XX\XX\Base;
class XX extends Base {

}

Answer 1

djgpp uses the gcc constraint system for extended asm.

void geninterrupt (int n) {
        __asm__ __volatile__("mov byte ptr [genint+1], al\n\t"
        "genint: int 0" : : "a" (n));
}

You will need to list the clobbered registers if the interrupt changes any.