《操作系统》的实验代码。
 
 
 
 
 

17 lines
441 B

void inline ex1(void){
asm ("movl $0xffff, %eax\n");
}
void inline ex2(void){
unsigned cr0;
asm volatile ("movl %%cr0, %0\n" :"=r"(cr0));
cr0 |= 0x80000000;
asm volatile ("movl %0, %%cr0\n" ::"r"(cr0));
}
void inline ex3(void){
long __res, arg1 = 2, arg2 = 22, arg3 = 222, arg4 = 233;
__asm__ __volatile__("int $0x80"
: "=a" (__res)
: "0" (11),"b" (arg1),"c" (arg2),"d" (arg3),"S" (arg4));
}