#include <Windows.h>

#pragma comment (linker, "/INCLUDE:_tls_used")
#pragma section (".CRT$XLY", long, read)

void __stdcall TLSCallBack(void *, unsigned long, void *) {
    if (IsDebuggerPresent()) {
  MessageBox(NULL, "A debugger has been found running in your system.\n"
   "Please, unload it from memory and restart your program.", "ACOrigins.exe", MB_ICONERROR);
  TerminateProcess(GetCurrentProcess(), 0);
    }
}
__declspec(allocate(".CRT$XLY"))PIMAGE_TLS_CALLBACK pTLSCallBack = TLSCallBack;

int __stdcall WinMain(HINSTANCE, HINSTANCE, char *, int) {
    MessageBox(nullptr, "Success!", "ACOrigins.exe", MB_OK);
    return 0;
}

static int val1 = 0;
static int val2 = 0;

void __stdcall tls_callback1(void *, unsigned long, void *) {
    if (Reason == DLL_PROCESS_ATTACH) val1 = 0xA;
}

void __stdcall tls_callback2(void *, unsigned long, void *) {
    if (Reason == DLL_PROCESS_ATTACH) val2 = 0xF;
}

#pragma comment (linker, "/INCLUDE:_tls_used")
#pragma comment (linker, "/INCLUDE:p_tls_callback1")
#pragma comment (linker, "/INCLUDE:p_tls_callback2")
#pragma const_seg (push)
#pragma const_seg (".CRT$XLAAA")
EXTERN_C const PIMAGE_TLS_CALLBACK p_tls_callback1 = tls_callback1;
#pragma const_seg (".CRT$XLAAB")
EXTERN_C const PIMAGE_TLS_CALLBACK p_tls_callback2 = tls_callback2;
#pragma const_seg (pop)
#endif

int main() {
    printf("Values from TlsCallBacks: tls1 = 0x%X, tls2 = 0x%X\n", val1, val2);
    getchar();
    return 0;
}