add lab-ex3 for inline assembly for C examples

related_info/lab1/lab1-ex3.c

@@ -0,0 +1,17 @@
+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));
+ }