c - x64 program returns the correct SIDT value occasionally (x64 assembly) -

i use visual studio 2012 , created x64 bit program returns value of sidt function (without offset). problem when run program, returns right value, when run program multiple times, returns right value

main.cpp:

#include <iostream> #include <conio.h> #include <stdlib.h>  using namespace std; extern "c" unsigned long long int sidt_function();  int main() {    printf("%llx\n", sidt_function());    _getch();    return 0; } 

sidt_function.asm:

.code  sidt_function proc push rbp mov rbp, rsp sub rsp, 130h sidt tbyte ptr [rbp-10] mov rax, [rbp-8] leave ret  sidt_function endp end 

each core (physical or virtual) in multi-core cpu has own idt. you're seeing idtr values different cores in system. none of them incorrect.