1 2 #include <stdio.h> 3 4 typedef unsigned long long int ULong; 5 do_clc(void)6ULong do_clc ( void ) 7 { 8 ULong res; 9 __asm__ __volatile__( 10 "pushq $0x8d5\n\t" /* OSZACP */ 11 "popfq\n\t" 12 "clc\n\t" 13 "pushfq\n\t" 14 "popq %0" 15 : "=r"(res) 16 : 17 : "memory", "cc" 18 ); 19 return res; 20 } 21 do_stc(void)22ULong do_stc ( void ) 23 { 24 ULong res; 25 __asm__ __volatile__( 26 "pushq $0x0\n\t" 27 "popfq\n\t" 28 "stc\n\t" 29 "pushfq\n\t" 30 "popq %0" 31 : "=r"(res) 32 : 33 : "memory", "cc" 34 ); 35 return res; 36 } 37 do_cmc(void)38ULong do_cmc ( void ) 39 { 40 ULong res; 41 __asm__ __volatile__( 42 "pushq $0x0\n\t" 43 "popfq\n\t" 44 "stc\n\t" 45 "cmc\n\t" 46 "pushfq\n\t" 47 "popq %0" 48 : "=r"(res) 49 : 50 : "memory", "cc" 51 ); 52 return res; 53 } 54 main(void)55int main ( void ) 56 { 57 printf("clc: 0x%016llx\n", 0x8d5 & do_clc()); 58 printf("stc: 0x%016llx\n", 0x8d5 & do_stc()); 59 printf("cmc: 0x%016llx\n", 0x8d5 & do_cmc()); 60 return 0; 61 } 62