x86cpuid.c

   1 #include <signal.h>
   2
   3 void nope()
   4 {
   5   exit(1);
   6 }
   7
   8 int main()
   9 {
  10   unsigned long x[4];
  11   unsigned long y[4];
  12   int i;
  13   int j;
  14   char c;
  15
  16   signal(SIGILL,nope);
  17
  18   x[0] = 0;
  19   x[1] = 0;
  20   x[2] = 0;
  21   x[3] = 0;
  22
  23   asm volatile(".byte 15;.byte 162" : "=a"(x[0]),"=b"(x[1]),"=c"(x[3]),"=d"(x[2]) : "0"(0) );
  24   if (!x[0]) return 0;
  25   asm volatile(".byte 15;.byte 162" : "=a"(y[0]),"=b"(y[1]),"=c"(y[2]),"=d"(y[3]) : "0"(1) );
  26
  27   for (i = 1;i < 4;++i)
  28     for (j = 0;j < 4;++j) {
  29       c = x[i] >> (8 * j);
  30       if (c < 32) c = 32;
  31       if (c > 126) c = 126;
  32       putchar(c);
  33     }
  34
  35   printf("-%08x-%08x\n",y[0],y[3]);
  36
  37   return 0;
  38 }