1 /* Test segment register getting. */ 2 3 #include <stdio.h> 4 5 int main(void) 6 { 7 unsigned short csw = -1; 8 unsigned int csl = -1; 9 unsigned long csq = -1; 10 unsigned short csw_mem = -1; 11 12 __asm__ __volatile__ ( 13 "movw %%cs, %0\n" /* mov segReg, r16 */ 14 "movl %%cs, %1\n" /* mov segReg, r32 */ 15 "movq %%cs, %2\n" /* mov segReg, r64 */ 16 "movw %%cs, %3\n" /* mov segReg, mem16 */ 17 : "=r" (csw), "=r" (csl), "=r" (csq), "=m" (csw_mem)); 18 19 printf("cs(w)=%u\n", csw); 20 printf("cs(l)=%u\n", csl); 21 printf("cs(q)=%lu\n", csq); 22 printf("cs(w_mem)=%u\n", csw_mem); 23 24 return 0; 25 } 26
