vm/os-windows.cpp

   1 #include "master.hpp"
   2
   3 namespace factor
   4 {
   5
   6 HMODULE hFactorDll;
   7
   8 void factor_vm::init_ffi()
   9 {
  10         hFactorDll = GetModuleHandle(FACTOR_DLL);
  11         if(!hFactorDll)
  12                 fatal_error("GetModuleHandle() failed", 0);
  13 }
  14
  15 void factor_vm::ffi_dlopen(dll *dll)
  16 {
  17         dll->handle = LoadLibraryEx((WCHAR *)alien_offset(dll->path), NULL, 0);
  18 }
  19
  20 void *factor_vm::ffi_dlsym(dll *dll, symbol_char *symbol)
  21 {
  22         return (void *)GetProcAddress(dll ? (HMODULE)dll->handle : hFactorDll, symbol);
  23 }
  24
  25 void *factor_vm::ffi_dlsym_raw(dll *dll, symbol_char *symbol)
  26 {
  27         return ffi_dlsym(dll, symbol);
  28 }
  29
  30 void factor_vm::ffi_dlclose(dll *dll)
  31 {
  32         FreeLibrary((HMODULE)dll->handle);
  33         dll->handle = NULL;
  34 }
  35
  36 BOOL factor_vm::windows_stat(vm_char *path)
  37 {
  38         BY_HANDLE_FILE_INFORMATION bhfi;
  39         HANDLE h = CreateFileW(path,
  40                         GENERIC_READ,
  41                         FILE_SHARE_READ,
  42                         NULL,
  43                         OPEN_EXISTING,
  44                         FILE_FLAG_BACKUP_SEMANTICS,
  45                         NULL);
  46
  47         if(h == INVALID_HANDLE_VALUE)
  48         {
  49                 // FindFirstFile is the only call that can stat c:\pagefile.sys
  50                 WIN32_FIND_DATA st;
  51                 HANDLE h;
  52
  53                 if(INVALID_HANDLE_VALUE == (h = FindFirstFile(path, &st)))
  54                         return false;
  55                 FindClose(h);
  56                 return true;
  57         }
  58         BOOL ret = GetFileInformationByHandle(h, &bhfi);
  59         CloseHandle(h);
  60         return ret;
  61 }
  62
  63 void factor_vm::windows_image_path(vm_char *full_path, vm_char *temp_path, unsigned int length)
  64 {
  65         wcsncpy(temp_path, full_path, length - 1);
  66         size_t full_path_len = wcslen(full_path);
  67         if (full_path_len < length - 1)
  68                 wcsncat(temp_path, L".image", length - full_path_len - 1);
  69         temp_path[length - 1] = 0;
  70 }
  71
  72 /* You must free() this yourself. */
  73 const vm_char *factor_vm::default_image_path()
  74 {
  75         vm_char full_path[MAX_UNICODE_PATH];
  76         vm_char *ptr;
  77         vm_char temp_path[MAX_UNICODE_PATH];
  78
  79         if(!GetModuleFileName(NULL, full_path, MAX_UNICODE_PATH))
  80                 fatal_error("GetModuleFileName() failed", 0);
  81
  82         if((ptr = wcsrchr(full_path, '.')))
  83                 *ptr = 0;
  84
  85         wcsncpy(temp_path, full_path, MAX_UNICODE_PATH - 1);
  86         size_t full_path_len = wcslen(full_path);
  87         if (full_path_len < MAX_UNICODE_PATH - 1)
  88                 wcsncat(temp_path, L".image", MAX_UNICODE_PATH - full_path_len - 1);
  89         temp_path[MAX_UNICODE_PATH - 1] = 0;
  90
  91         return safe_strdup(temp_path);
  92 }
  93
  94 /* You must free() this yourself. */
  95 const vm_char *factor_vm::vm_executable_path()
  96 {
  97         vm_char full_path[MAX_UNICODE_PATH];
  98         if(!GetModuleFileName(NULL, full_path, MAX_UNICODE_PATH))
  99                 fatal_error("GetModuleFileName() failed", 0);
 100         return safe_strdup(full_path);
 101 }
 102
 103 void factor_vm::primitive_existsp()
 104 {
 105         vm_char *path = untag_check<byte_array>(ctx->pop())->data<vm_char>();
 106         ctx->push(tag_boolean(windows_stat(path)));
 107 }
 108
 109 segment::segment(cell size_, bool executable_p)
 110 {
 111         size = size_;
 112
 113         char *mem;
 114         DWORD ignore;
 115
 116         if((mem = (char *)VirtualAlloc(NULL, getpagesize() * 2 + size,
 117                 MEM_COMMIT, executable_p ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE)) == 0)
 118                 out_of_memory();
 119
 120         if (!VirtualProtect(mem, getpagesize(), PAGE_NOACCESS, &ignore))
 121                 fatal_error("Cannot allocate low guard page", (cell)mem);
 122
 123         if (!VirtualProtect(mem + size + getpagesize(),
 124                 getpagesize(), PAGE_NOACCESS, &ignore))
 125                 fatal_error("Cannot allocate high guard page", (cell)mem);
 126
 127         start = (cell)mem + getpagesize();
 128         end = start + size;
 129 }
 130
 131 segment::~segment()
 132 {
 133         SYSTEM_INFO si;
 134         GetSystemInfo(&si);
 135         if(!VirtualFree((void*)(start - si.dwPageSize), 0, MEM_RELEASE))
 136                 fatal_error("Segment deallocation failed",0);
 137 }
 138
 139 long getpagesize()
 140 {
 141         static long g_pagesize = 0;
 142         if(!g_pagesize)
 143         {
 144                 SYSTEM_INFO system_info;
 145                 GetSystemInfo (&system_info);
 146                 g_pagesize = system_info.dwPageSize;
 147         }
 148         return g_pagesize;
 149 }
 150
 151 void code_heap::guard_safepoint()
 152 {
 153         DWORD ignore;
 154         if (!VirtualProtect(safepoint_page, getpagesize(), PAGE_NOACCESS, &ignore))
 155                 fatal_error("Cannot protect safepoint guard page", (cell)safepoint_page);
 156 }
 157
 158 void code_heap::unguard_safepoint()
 159 {
 160         DWORD ignore;
 161         if (!VirtualProtect(safepoint_page, getpagesize(), PAGE_READWRITE, &ignore))
 162                 fatal_error("Cannot unprotect safepoint guard page", (cell)safepoint_page);
 163 }
 164
 165 void factor_vm::move_file(const vm_char *path1, const vm_char *path2)
 166 {
 167         if(MoveFileEx((path1),(path2),MOVEFILE_REPLACE_EXISTING) == false)
 168                 general_error(ERROR_IO,tag_fixnum(GetLastError()),false_object);
 169 }
 170
 171 void factor_vm::init_signals() {}
 172 void safepoint_state::report_signal(int fd) volatile {}
 173
 174 THREADHANDLE start_thread(void *(*start_routine)(void *), void *args)
 175 {
 176         return (void *)CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE)start_routine, args, 0, 0);
 177 }
 178
 179 u64 nano_count()
 180 {
 181         static double scale_factor;
 182
 183         static u32 hi = 0;
 184         static u32 lo = 0;
 185
 186         LARGE_INTEGER count;
 187         BOOL ret = QueryPerformanceCounter(&count);
 188         if(ret == 0)
 189                 fatal_error("QueryPerformanceCounter", 0);
 190
 191         if(scale_factor == 0.0)
 192         {
 193                 LARGE_INTEGER frequency;
 194                 BOOL ret = QueryPerformanceFrequency(&frequency);
 195                 if(ret == 0)
 196                         fatal_error("QueryPerformanceFrequency", 0);
 197                 scale_factor = (1000000000.0 / frequency.QuadPart);
 198         }
 199
 200 #ifdef FACTOR_64
 201         hi = count.HighPart;
 202 #else
 203         /* On VirtualBox, QueryPerformanceCounter does not increment
 204         the high part every time the low part overflows.  Workaround. */
 205         if(lo > count.LowPart)
 206                 hi++;
 207 #endif
 208         lo = count.LowPart;
 209
 210         return (u64)((((u64)hi << 32) | (u64)lo) * scale_factor);
 211 }
 212
 213 void sleep_nanos(u64 nsec)
 214 {
 215         Sleep((DWORD)(nsec/1000000));
 216 }
 217
 218 LONG factor_vm::exception_handler(PEXCEPTION_RECORD e, void *frame, PCONTEXT c, void *dispatch)
 219 {
 220         switch (e->ExceptionCode)
 221         {
 222         case EXCEPTION_ACCESS_VIOLATION:
 223                 signal_fault_addr = e->ExceptionInformation[1];
 224                 dispatch_signal_handler(
 225                         (cell*)&c->ESP,
 226                         (cell*)&c->EIP,
 227                         (cell)factor::memory_signal_handler_impl
 228                 );
 229                 break;
 230
 231         case STATUS_FLOAT_DENORMAL_OPERAND:
 232         case STATUS_FLOAT_DIVIDE_BY_ZERO:
 233         case STATUS_FLOAT_INEXACT_RESULT:
 234         case STATUS_FLOAT_INVALID_OPERATION:
 235         case STATUS_FLOAT_OVERFLOW:
 236         case STATUS_FLOAT_STACK_CHECK:
 237         case STATUS_FLOAT_UNDERFLOW:
 238         case STATUS_FLOAT_MULTIPLE_FAULTS:
 239         case STATUS_FLOAT_MULTIPLE_TRAPS:
 240 #ifdef FACTOR_64
 241                 signal_fpu_status = fpu_status(MXCSR(c));
 242 #else
 243                 signal_fpu_status = fpu_status(X87SW(c) | MXCSR(c));
 244
 245                 /* This seems to have no effect */
 246                 X87SW(c) = 0;
 247 #endif
 248                 MXCSR(c) &= 0xffffffc0;
 249                 dispatch_signal_handler(
 250                         (cell*)&c->ESP,
 251                         (cell*)&c->EIP,
 252                         (cell)factor::fp_signal_handler_impl
 253                 );
 254                 break;
 255         default:
 256                 signal_number = e->ExceptionCode;
 257                 dispatch_signal_handler(
 258                         (cell*)&c->ESP,
 259                         (cell*)&c->EIP,
 260                         (cell)factor::synchronous_signal_handler_impl
 261                 );
 262                 break;
 263         }
 264
 265         return 0;
 266 }
 267
 268 VM_C_API LONG exception_handler(PEXCEPTION_RECORD e, void *frame, PCONTEXT c, void *dispatch)
 269 {
 270         factor_vm *vm = current_vm_p();
 271         if (vm)
 272                 return vm->exception_handler(e,frame,c,dispatch);
 273         else
 274         {
 275                 fatal_error("Foreign thread received exception", e->ExceptionCode);
 276                 return 0; // to placate MSVC
 277         }
 278 }
 279
 280 static BOOL WINAPI ctrl_handler(DWORD dwCtrlType)
 281 {
 282         switch (dwCtrlType) {
 283         case CTRL_C_EVENT:
 284         case CTRL_BREAK_EVENT:
 285         {
 286                 /* The CtrlHandler runs in its own thread without stopping the main thread.
 287                 Since in practice nobody uses the multi-VM stuff yet, we just grab the first
 288                 VM we can get. This will not be a good idea when we actually support native
 289                 threads. */
 290                 assert(thread_vms.size() == 1);
 291                 factor_vm *vm = thread_vms.begin()->second;
 292                 vm->safepoint.enqueue_fep();
 293                 return TRUE;
 294         }
 295         default:
 296                 return FALSE;
 297         }
 298 }
 299
 300 void factor_vm::open_console()
 301 {
 302         SetConsoleCtrlHandler(factor::ctrl_handler, TRUE);
 303 }
 304
 305 void factor_vm::sampler_thread_loop()
 306 {
 307         LARGE_INTEGER counter, new_counter, units_per_second;
 308         DWORD ok;
 309
 310         ok = QueryPerformanceFrequency(&units_per_second);
 311         assert(ok);
 312
 313         ok = QueryPerformanceCounter(&counter);
 314         assert(ok);
 315
 316         counter.QuadPart *= samples_per_second;
 317         while (atomic::load(&sampling_profiler_p))
 318         {
 319                 SwitchToThread();
 320                 ok = QueryPerformanceCounter(&new_counter);
 321                 assert(ok);
 322                 new_counter.QuadPart *= samples_per_second;
 323                 cell samples = 0;
 324                 while (new_counter.QuadPart - counter.QuadPart > units_per_second.QuadPart)
 325                 {
 326                         ++samples;
 327                         counter.QuadPart += units_per_second.QuadPart;
 328                 }
 329
 330                 if (samples > 0)
 331                 {
 332                         DWORD suscount = SuspendThread(thread);
 333                         assert(suscount == 0);
 334
 335                         CONTEXT context;
 336                         memset((void*)&context, 0, sizeof(CONTEXT));
 337                         context.ContextFlags = CONTEXT_CONTROL;
 338                         BOOL context_ok = GetThreadContext(thread, &context);
 339                         assert(context_ok);
 340
 341                         suscount = ResumeThread(thread);
 342                         assert(suscount == 1);
 343
 344                         safepoint.enqueue_samples(samples, context.EIP, false);
 345                 }
 346         }
 347 }
 348
 349 static DWORD WINAPI sampler_thread_entry(LPVOID parent_vm)
 350 {
 351         static_cast<factor_vm*>(parent_vm)->sampler_thread_loop();
 352         return 0;
 353 }
 354
 355 void factor_vm::start_sampling_profiler_timer()
 356 {
 357         sampler_thread = CreateThread(
 358                 NULL,
 359                 0,
 360                 &sampler_thread_entry,
 361                 static_cast<LPVOID>(this),
 362                 0,
 363                 NULL
 364         );
 365 }
 366
 367 void factor_vm::end_sampling_profiler_timer()
 368 {
 369         atomic::store(&sampling_profiler_p, false);
 370         DWORD wait_result = WaitForSingleObject(sampler_thread,
 371                 3000*(DWORD)samples_per_second);
 372         if (wait_result != WAIT_OBJECT_0)
 373                 TerminateThread(sampler_thread, 0);
 374         sampler_thread = NULL;
 375 }
 376
 377 }