libsanitizer/sanitizer_common/sanitizer_win.cc

   1 //===-- sanitizer_win.cc --------------------------------------------------===//
   2 //
   3 // This file is distributed under the University of Illinois Open Source
   4 // License. See LICENSE.TXT for details.
   5 //
   6 //===----------------------------------------------------------------------===//
   7 //
   8 // This file is shared between AddressSanitizer and ThreadSanitizer
   9 // run-time libraries and implements windows-specific functions from
  10 // sanitizer_libc.h.
  11 //===----------------------------------------------------------------------===//
  12
  13 #include "sanitizer_platform.h"
  14 #if SANITIZER_WINDOWS
  15
  16 #define WIN32_LEAN_AND_MEAN
  17 #define NOGDI
  18 #include <windows.h>
  19 #include <dbghelp.h>
  20 #include <io.h>
  21 #include <psapi.h>
  22 #include <stdlib.h>
  23
  24 #include "sanitizer_common.h"
  25 #include "sanitizer_libc.h"
  26 #include "sanitizer_mutex.h"
  27 #include "sanitizer_placement_new.h"
  28 #include "sanitizer_stacktrace.h"
  29
  30 namespace __sanitizer {
  31
  32 #include "sanitizer_syscall_generic.inc"
  33
  34 // --------------------- sanitizer_common.h
  35 uptr GetPageSize() {
  36   // FIXME: there is an API for getting the system page size (GetSystemInfo or
  37   // GetNativeSystemInfo), but if we use it here we get test failures elsewhere.
  38   return 1U << 14;
  39 }
  40
  41 uptr GetMmapGranularity() {
  42   return 1U << 16;  // FIXME: is this configurable?
  43 }
  44
  45 uptr GetMaxVirtualAddress() {
  46   SYSTEM_INFO si;
  47   GetSystemInfo(&si);
  48   return (uptr)si.lpMaximumApplicationAddress;
  49 }
  50
  51 bool FileExists(const char *filename) {
  52   return ::GetFileAttributesA(filename) != INVALID_FILE_ATTRIBUTES;
  53 }
  54
  55 uptr internal_getpid() {
  56   return GetProcessId(GetCurrentProcess());
  57 }
  58
  59 // In contrast to POSIX, on Windows GetCurrentThreadId()
  60 // returns a system-unique identifier.
  61 uptr GetTid() {
  62   return GetCurrentThreadId();
  63 }
  64
  65 uptr GetThreadSelf() {
  66   return GetTid();
  67 }
  68
  69 #if !SANITIZER_GO
  70 void GetThreadStackTopAndBottom(bool at_initialization, uptr *stack_top,
  71                                 uptr *stack_bottom) {
  72   CHECK(stack_top);
  73   CHECK(stack_bottom);
  74   MEMORY_BASIC_INFORMATION mbi;
  75   CHECK_NE(VirtualQuery(&mbi /* on stack */, &mbi, sizeof(mbi)), 0);
  76   // FIXME: is it possible for the stack to not be a single allocation?
  77   // Are these values what ASan expects to get (reserved, not committed;
  78   // including stack guard page) ?
  79   *stack_top = (uptr)mbi.BaseAddress + mbi.RegionSize;
  80   *stack_bottom = (uptr)mbi.AllocationBase;
  81 }
  82 #endif  // #if !SANITIZER_GO
  83
  84 void *MmapOrDie(uptr size, const char *mem_type) {
  85   void *rv = VirtualAlloc(0, size, MEM_RESERVE | MEM_COMMIT, PAGE_READWRITE);
  86   if (rv == 0)
  87     ReportMmapFailureAndDie(size, mem_type, "allocate", GetLastError());
  88   return rv;
  89 }
  90
  91 void UnmapOrDie(void *addr, uptr size) {
  92   if (!size || !addr)
  93     return;
  94
  95   if (VirtualFree(addr, size, MEM_DECOMMIT) == 0) {
  96     Report("ERROR: %s failed to "
  97            "deallocate 0x%zx (%zd) bytes at address %p (error code: %d)\n",
  98            SanitizerToolName, size, size, addr, GetLastError());
  99     CHECK("unable to unmap" && 0);
 100   }
 101 }
 102
 103 void *MmapFixedNoReserve(uptr fixed_addr, uptr size, const char *name) {
 104   // FIXME: is this really "NoReserve"? On Win32 this does not matter much,
 105   // but on Win64 it does.
 106   (void)name; // unsupported
 107   void *p = VirtualAlloc((LPVOID)fixed_addr, size,
 108       MEM_RESERVE | MEM_COMMIT, PAGE_READWRITE);
 109   if (p == 0)
 110     Report("ERROR: %s failed to "
 111            "allocate %p (%zd) bytes at %p (error code: %d)\n",
 112            SanitizerToolName, size, size, fixed_addr, GetLastError());
 113   return p;
 114 }
 115
 116 void *MmapFixedOrDie(uptr fixed_addr, uptr size) {
 117   return MmapFixedNoReserve(fixed_addr, size);
 118 }
 119
 120 void *MmapNoReserveOrDie(uptr size, const char *mem_type) {
 121   // FIXME: make this really NoReserve?
 122   return MmapOrDie(size, mem_type);
 123 }
 124
 125 void *MmapNoAccess(uptr fixed_addr, uptr size, const char *name) {
 126   (void)name; // unsupported
 127   void *res = VirtualAlloc((LPVOID)fixed_addr, size,
 128                            MEM_RESERVE | MEM_COMMIT, PAGE_NOACCESS);
 129   if (res == 0)
 130     Report("WARNING: %s failed to "
 131            "mprotect %p (%zd) bytes at %p (error code: %d)\n",
 132            SanitizerToolName, size, size, fixed_addr, GetLastError());
 133   return res;
 134 }
 135
 136 bool MprotectNoAccess(uptr addr, uptr size) {
 137   DWORD old_protection;
 138   return VirtualProtect((LPVOID)addr, size, PAGE_NOACCESS, &old_protection);
 139 }
 140
 141
 142 void FlushUnneededShadowMemory(uptr addr, uptr size) {
 143   // This is almost useless on 32-bits.
 144   // FIXME: add madvise-analog when we move to 64-bits.
 145 }
 146
 147 void NoHugePagesInRegion(uptr addr, uptr size) {
 148   // FIXME: probably similar to FlushUnneededShadowMemory.
 149 }
 150
 151 void DontDumpShadowMemory(uptr addr, uptr length) {
 152   // This is almost useless on 32-bits.
 153   // FIXME: add madvise-analog when we move to 64-bits.
 154 }
 155
 156 bool MemoryRangeIsAvailable(uptr range_start, uptr range_end) {
 157   MEMORY_BASIC_INFORMATION mbi;
 158   CHECK(VirtualQuery((void *)range_start, &mbi, sizeof(mbi)));
 159   return mbi.Protect == PAGE_NOACCESS &&
 160          (uptr)mbi.BaseAddress + mbi.RegionSize >= range_end;
 161 }
 162
 163 void *MapFileToMemory(const char *file_name, uptr *buff_size) {
 164   UNIMPLEMENTED();
 165 }
 166
 167 void *MapWritableFileToMemory(void *addr, uptr size, fd_t fd, OFF_T offset) {
 168   UNIMPLEMENTED();
 169 }
 170
 171 static const int kMaxEnvNameLength = 128;
 172 static const DWORD kMaxEnvValueLength = 32767;
 173
 174 namespace {
 175
 176 struct EnvVariable {
 177   char name[kMaxEnvNameLength];
 178   char value[kMaxEnvValueLength];
 179 };
 180
 181 }  // namespace
 182
 183 static const int kEnvVariables = 5;
 184 static EnvVariable env_vars[kEnvVariables];
 185 static int num_env_vars;
 186
 187 const char *GetEnv(const char *name) {
 188   // Note: this implementation caches the values of the environment variables
 189   // and limits their quantity.
 190   for (int i = 0; i < num_env_vars; i++) {
 191     if (0 == internal_strcmp(name, env_vars[i].name))
 192       return env_vars[i].value;
 193   }
 194   CHECK_LT(num_env_vars, kEnvVariables);
 195   DWORD rv = GetEnvironmentVariableA(name, env_vars[num_env_vars].value,
 196                                      kMaxEnvValueLength);
 197   if (rv > 0 && rv < kMaxEnvValueLength) {
 198     CHECK_LT(internal_strlen(name), kMaxEnvNameLength);
 199     internal_strncpy(env_vars[num_env_vars].name, name, kMaxEnvNameLength);
 200     num_env_vars++;
 201     return env_vars[num_env_vars - 1].value;
 202   }
 203   return 0;
 204 }
 205
 206 const char *GetPwd() {
 207   UNIMPLEMENTED();
 208 }
 209
 210 u32 GetUid() {
 211   UNIMPLEMENTED();
 212 }
 213
 214 namespace {
 215 struct ModuleInfo {
 216   const char *filepath;
 217   uptr base_address;
 218   uptr end_address;
 219 };
 220
 221 #ifndef SANITIZER_GO
 222 int CompareModulesBase(const void *pl, const void *pr) {
 223   const ModuleInfo *l = (ModuleInfo *)pl, *r = (ModuleInfo *)pr;
 224   if (l->base_address < r->base_address)
 225     return -1;
 226   return l->base_address > r->base_address;
 227 }
 228 #endif
 229 }  // namespace
 230
 231 #ifndef SANITIZER_GO
 232 void DumpProcessMap() {
 233   Report("Dumping process modules:\n");
 234   InternalScopedBuffer<LoadedModule> modules(kMaxNumberOfModules);
 235   uptr num_modules =
 236       GetListOfModules(modules.data(), kMaxNumberOfModules, nullptr);
 237
 238   InternalScopedBuffer<ModuleInfo> module_infos(num_modules);
 239   for (size_t i = 0; i < num_modules; ++i) {
 240     module_infos[i].filepath = modules[i].full_name();
 241     module_infos[i].base_address = modules[i].base_address();
 242     module_infos[i].end_address = modules[i].ranges().next()->end;
 243   }
 244   qsort(module_infos.data(), num_modules, sizeof(ModuleInfo),
 245         CompareModulesBase);
 246
 247   for (size_t i = 0; i < num_modules; ++i) {
 248     const ModuleInfo &mi = module_infos[i];
 249     if (mi.end_address != 0) {
 250       Printf("\t%p-%p %s\n", mi.base_address, mi.end_address,
 251              mi.filepath[0] ? mi.filepath : "[no name]");
 252     } else if (mi.filepath[0]) {
 253       Printf("\t??\?-??? %s\n", mi.filepath);
 254     } else {
 255       Printf("\t???\n");
 256     }
 257   }
 258 }
 259 #endif
 260
 261 void DisableCoreDumperIfNecessary() {
 262   // Do nothing.
 263 }
 264
 265 void ReExec() {
 266   UNIMPLEMENTED();
 267 }
 268
 269 void PrepareForSandboxing(__sanitizer_sandbox_arguments *args) {
 270 #if !SANITIZER_GO
 271   CovPrepareForSandboxing(args);
 272 #endif
 273 }
 274
 275 bool StackSizeIsUnlimited() {
 276   UNIMPLEMENTED();
 277 }
 278
 279 void SetStackSizeLimitInBytes(uptr limit) {
 280   UNIMPLEMENTED();
 281 }
 282
 283 bool AddressSpaceIsUnlimited() {
 284   UNIMPLEMENTED();
 285 }
 286
 287 void SetAddressSpaceUnlimited() {
 288   UNIMPLEMENTED();
 289 }
 290
 291 bool IsPathSeparator(const char c) {
 292   return c == '\\' || c == '/';
 293 }
 294
 295 bool IsAbsolutePath(const char *path) {
 296   UNIMPLEMENTED();
 297 }
 298
 299 void SleepForSeconds(int seconds) {
 300   Sleep(seconds * 1000);
 301 }
 302
 303 void SleepForMillis(int millis) {
 304   Sleep(millis);
 305 }
 306
 307 u64 NanoTime() {
 308   return 0;
 309 }
 310
 311 void Abort() {
 312   if (::IsDebuggerPresent())
 313     __debugbreak();
 314   internal__exit(3);
 315 }
 316
 317 // Read the file to extract the ImageBase field from the PE header. If ASLR is
 318 // disabled and this virtual address is available, the loader will typically
 319 // load the image at this address. Therefore, we call it the preferred base. Any
 320 // addresses in the DWARF typically assume that the object has been loaded at
 321 // this address.
 322 static uptr GetPreferredBase(const char *modname) {
 323   fd_t fd = OpenFile(modname, RdOnly, nullptr);
 324   if (fd == kInvalidFd)
 325     return 0;
 326   FileCloser closer(fd);
 327
 328   // Read just the DOS header.
 329   IMAGE_DOS_HEADER dos_header;
 330   uptr bytes_read;
 331   if (!ReadFromFile(fd, &dos_header, sizeof(dos_header), &bytes_read) ||
 332       bytes_read != sizeof(dos_header))
 333     return 0;
 334
 335   // The file should start with the right signature.
 336   if (dos_header.e_magic != IMAGE_DOS_SIGNATURE)
 337     return 0;
 338
 339   // The layout at e_lfanew is:
 340   // "PE\0\0"
 341   // IMAGE_FILE_HEADER
 342   // IMAGE_OPTIONAL_HEADER
 343   // Seek to e_lfanew and read all that data.
 344   char buf[4 + sizeof(IMAGE_FILE_HEADER) + sizeof(IMAGE_OPTIONAL_HEADER)];
 345   if (::SetFilePointer(fd, dos_header.e_lfanew, nullptr, FILE_BEGIN) ==
 346       INVALID_SET_FILE_POINTER)
 347     return 0;
 348   if (!ReadFromFile(fd, &buf[0], sizeof(buf), &bytes_read) ||
 349       bytes_read != sizeof(buf))
 350     return 0;
 351
 352   // Check for "PE\0\0" before the PE header.
 353   char *pe_sig = &buf[0];
 354   if (internal_memcmp(pe_sig, "PE\0\0", 4) != 0)
 355     return 0;
 356
 357   // Skip over IMAGE_FILE_HEADER. We could do more validation here if we wanted.
 358   IMAGE_OPTIONAL_HEADER *pe_header =
 359       (IMAGE_OPTIONAL_HEADER *)(pe_sig + 4 + sizeof(IMAGE_FILE_HEADER));
 360
 361   // Check for more magic in the PE header.
 362   if (pe_header->Magic != IMAGE_NT_OPTIONAL_HDR_MAGIC)
 363     return 0;
 364
 365   // Finally, return the ImageBase.
 366   return (uptr)pe_header->ImageBase;
 367 }
 368
 369 #ifndef SANITIZER_GO
 370 uptr GetListOfModules(LoadedModule *modules, uptr max_modules,
 371                       string_predicate_t filter) {
 372   HANDLE cur_process = GetCurrentProcess();
 373
 374   // Query the list of modules.  Start by assuming there are no more than 256
 375   // modules and retry if that's not sufficient.
 376   HMODULE *hmodules = 0;
 377   uptr modules_buffer_size = sizeof(HMODULE) * 256;
 378   DWORD bytes_required;
 379   while (!hmodules) {
 380     hmodules = (HMODULE *)MmapOrDie(modules_buffer_size, __FUNCTION__);
 381     CHECK(EnumProcessModules(cur_process, hmodules, modules_buffer_size,
 382                              &bytes_required));
 383     if (bytes_required > modules_buffer_size) {
 384       // Either there turned out to be more than 256 hmodules, or new hmodules
 385       // could have loaded since the last try.  Retry.
 386       UnmapOrDie(hmodules, modules_buffer_size);
 387       hmodules = 0;
 388       modules_buffer_size = bytes_required;
 389     }
 390   }
 391
 392   // |num_modules| is the number of modules actually present,
 393   // |count| is the number of modules we return.
 394   size_t nun_modules = bytes_required / sizeof(HMODULE),
 395          count = 0;
 396   for (size_t i = 0; i < nun_modules && count < max_modules; ++i) {
 397     HMODULE handle = hmodules[i];
 398     MODULEINFO mi;
 399     if (!GetModuleInformation(cur_process, handle, &mi, sizeof(mi)))
 400       continue;
 401
 402     // Get the UTF-16 path and convert to UTF-8.
 403     wchar_t modname_utf16[kMaxPathLength];
 404     int modname_utf16_len =
 405         GetModuleFileNameW(handle, modname_utf16, kMaxPathLength);
 406     if (modname_utf16_len == 0)
 407       modname_utf16[0] = '\0';
 408     char module_name[kMaxPathLength];
 409     int module_name_len =
 410         ::WideCharToMultiByte(CP_UTF8, 0, modname_utf16, modname_utf16_len + 1,
 411                               &module_name[0], kMaxPathLength, NULL, NULL);
 412     module_name[module_name_len] = '\0';
 413
 414     if (filter && !filter(module_name))
 415       continue;
 416
 417     uptr base_address = (uptr)mi.lpBaseOfDll;
 418     uptr end_address = (uptr)mi.lpBaseOfDll + mi.SizeOfImage;
 419
 420     // Adjust the base address of the module so that we get a VA instead of an
 421     // RVA when computing the module offset. This helps llvm-symbolizer find the
 422     // right DWARF CU. In the common case that the image is loaded at it's
 423     // preferred address, we will now print normal virtual addresses.
 424     uptr preferred_base = GetPreferredBase(&module_name[0]);
 425     uptr adjusted_base = base_address - preferred_base;
 426
 427     LoadedModule *cur_module = &modules[count];
 428     cur_module->set(module_name, adjusted_base);
 429     // We add the whole module as one single address range.
 430     cur_module->addAddressRange(base_address, end_address, /*executable*/ true);
 431     count++;
 432   }
 433   UnmapOrDie(hmodules, modules_buffer_size);
 434
 435   return count;
 436 };
 437
 438 // We can't use atexit() directly at __asan_init time as the CRT is not fully
 439 // initialized at this point.  Place the functions into a vector and use
 440 // atexit() as soon as it is ready for use (i.e. after .CRT$XIC initializers).
 441 InternalMmapVectorNoCtor<void (*)(void)> atexit_functions;
 442
 443 int Atexit(void (*function)(void)) {
 444   atexit_functions.push_back(function);
 445   return 0;
 446 }
 447
 448 static int RunAtexit() {
 449   int ret = 0;
 450   for (uptr i = 0; i < atexit_functions.size(); ++i) {
 451     ret |= atexit(atexit_functions[i]);
 452   }
 453   return ret;
 454 }
 455
 456 #pragma section(".CRT$XID", long, read)  // NOLINT
 457 __declspec(allocate(".CRT$XID")) int (*__run_atexit)() = RunAtexit;
 458 #endif
 459
 460 // ------------------ sanitizer_libc.h
 461 fd_t OpenFile(const char *filename, FileAccessMode mode, error_t *last_error) {
 462   fd_t res;
 463   if (mode == RdOnly) {
 464     res = CreateFile(filename, GENERIC_READ,
 465                      FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
 466                      nullptr, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, nullptr);
 467   } else if (mode == WrOnly) {
 468     res = CreateFile(filename, GENERIC_WRITE, 0, nullptr, CREATE_ALWAYS,
 469                      FILE_ATTRIBUTE_NORMAL, nullptr);
 470   } else {
 471     UNIMPLEMENTED();
 472   }
 473   CHECK(res != kStdoutFd || kStdoutFd == kInvalidFd);
 474   CHECK(res != kStderrFd || kStderrFd == kInvalidFd);
 475   if (res == kInvalidFd && last_error)
 476     *last_error = GetLastError();
 477   return res;
 478 }
 479
 480 void CloseFile(fd_t fd) {
 481   CloseHandle(fd);
 482 }
 483
 484 bool ReadFromFile(fd_t fd, void *buff, uptr buff_size, uptr *bytes_read,
 485                   error_t *error_p) {
 486   CHECK(fd != kInvalidFd);
 487
 488   // bytes_read can't be passed directly to ReadFile:
 489   // uptr is unsigned long long on 64-bit Windows.
 490   unsigned long num_read_long;
 491
 492   bool success = ::ReadFile(fd, buff, buff_size, &num_read_long, nullptr);
 493   if (!success && error_p)
 494     *error_p = GetLastError();
 495   if (bytes_read)
 496     *bytes_read = num_read_long;
 497   return success;
 498 }
 499
 500 bool SupportsColoredOutput(fd_t fd) {
 501   // FIXME: support colored output.
 502   return false;
 503 }
 504
 505 bool WriteToFile(fd_t fd, const void *buff, uptr buff_size, uptr *bytes_written,
 506                  error_t *error_p) {
 507   CHECK(fd != kInvalidFd);
 508
 509   // Handle null optional parameters.
 510   error_t dummy_error;
 511   error_p = error_p ? error_p : &dummy_error;
 512   uptr dummy_bytes_written;
 513   bytes_written = bytes_written ? bytes_written : &dummy_bytes_written;
 514
 515   // Initialize output parameters in case we fail.
 516   *error_p = 0;
 517   *bytes_written = 0;
 518
 519   // Map the conventional Unix fds 1 and 2 to Windows handles. They might be
 520   // closed, in which case this will fail.
 521   if (fd == kStdoutFd || fd == kStderrFd) {
 522     fd = GetStdHandle(fd == kStdoutFd ? STD_OUTPUT_HANDLE : STD_ERROR_HANDLE);
 523     if (fd == 0) {
 524       *error_p = ERROR_INVALID_HANDLE;
 525       return false;
 526     }
 527   }
 528
 529   DWORD bytes_written_32;
 530   if (!WriteFile(fd, buff, buff_size, &bytes_written_32, 0)) {
 531     *error_p = GetLastError();
 532     return false;
 533   } else {
 534     *bytes_written = bytes_written_32;
 535     return true;
 536   }
 537 }
 538
 539 bool RenameFile(const char *oldpath, const char *newpath, error_t *error_p) {
 540   UNIMPLEMENTED();
 541 }
 542
 543 uptr internal_sched_yield() {
 544   Sleep(0);
 545   return 0;
 546 }
 547
 548 void internal__exit(int exitcode) {
 549   ExitProcess(exitcode);
 550 }
 551
 552 uptr internal_ftruncate(fd_t fd, uptr size) {
 553   UNIMPLEMENTED();
 554 }
 555
 556 uptr GetRSS() {
 557   return 0;
 558 }
 559
 560 void *internal_start_thread(void (*func)(void *arg), void *arg) { return 0; }
 561 void internal_join_thread(void *th) { }
 562
 563 // ---------------------- BlockingMutex ---------------- {{{1
 564 const uptr LOCK_UNINITIALIZED = 0;
 565 const uptr LOCK_READY = (uptr)-1;
 566
 567 BlockingMutex::BlockingMutex(LinkerInitialized li) {
 568   // FIXME: see comments in BlockingMutex::Lock() for the details.
 569   CHECK(li == LINKER_INITIALIZED || owner_ == LOCK_UNINITIALIZED);
 570
 571   CHECK(sizeof(CRITICAL_SECTION) <= sizeof(opaque_storage_));
 572   InitializeCriticalSection((LPCRITICAL_SECTION)opaque_storage_);
 573   owner_ = LOCK_READY;
 574 }
 575
 576 BlockingMutex::BlockingMutex() {
 577   CHECK(sizeof(CRITICAL_SECTION) <= sizeof(opaque_storage_));
 578   InitializeCriticalSection((LPCRITICAL_SECTION)opaque_storage_);
 579   owner_ = LOCK_READY;
 580 }
 581
 582 void BlockingMutex::Lock() {
 583   if (owner_ == LOCK_UNINITIALIZED) {
 584     // FIXME: hm, global BlockingMutex objects are not initialized?!?
 585     // This might be a side effect of the clang+cl+link Frankenbuild...
 586     new(this) BlockingMutex((LinkerInitialized)(LINKER_INITIALIZED + 1));
 587
 588     // FIXME: If it turns out the linker doesn't invoke our
 589     // constructors, we should probably manually Lock/Unlock all the global
 590     // locks while we're starting in one thread to avoid double-init races.
 591   }
 592   EnterCriticalSection((LPCRITICAL_SECTION)opaque_storage_);
 593   CHECK_EQ(owner_, LOCK_READY);
 594   owner_ = GetThreadSelf();
 595 }
 596
 597 void BlockingMutex::Unlock() {
 598   CHECK_EQ(owner_, GetThreadSelf());
 599   owner_ = LOCK_READY;
 600   LeaveCriticalSection((LPCRITICAL_SECTION)opaque_storage_);
 601 }
 602
 603 void BlockingMutex::CheckLocked() {
 604   CHECK_EQ(owner_, GetThreadSelf());
 605 }
 606
 607 uptr GetTlsSize() {
 608   return 0;
 609 }
 610
 611 void InitTlsSize() {
 612 }
 613
 614 void GetThreadStackAndTls(bool main, uptr *stk_addr, uptr *stk_size,
 615                           uptr *tls_addr, uptr *tls_size) {
 616 #ifdef SANITIZER_GO
 617   *stk_addr = 0;
 618   *stk_size = 0;
 619   *tls_addr = 0;
 620   *tls_size = 0;
 621 #else
 622   uptr stack_top, stack_bottom;
 623   GetThreadStackTopAndBottom(main, &stack_top, &stack_bottom);
 624   *stk_addr = stack_bottom;
 625   *stk_size = stack_top - stack_bottom;
 626   *tls_addr = 0;
 627   *tls_size = 0;
 628 #endif
 629 }
 630
 631 #if !SANITIZER_GO
 632 void BufferedStackTrace::SlowUnwindStack(uptr pc, u32 max_depth) {
 633   CHECK_GE(max_depth, 2);
 634   // FIXME: CaptureStackBackTrace might be too slow for us.
 635   // FIXME: Compare with StackWalk64.
 636   // FIXME: Look at LLVMUnhandledExceptionFilter in Signals.inc
 637   size = CaptureStackBackTrace(2, Min(max_depth, kStackTraceMax),
 638                                (void**)trace, 0);
 639   if (size == 0)
 640     return;
 641
 642   // Skip the RTL frames by searching for the PC in the stacktrace.
 643   uptr pc_location = LocatePcInTrace(pc);
 644   PopStackFrames(pc_location);
 645 }
 646
 647 void BufferedStackTrace::SlowUnwindStackWithContext(uptr pc, void *context,
 648                                                     u32 max_depth) {
 649   CONTEXT ctx = *(CONTEXT *)context;
 650   STACKFRAME64 stack_frame;
 651   memset(&stack_frame, 0, sizeof(stack_frame));
 652   size = 0;
 653 #if defined(_WIN64)
 654   int machine_type = IMAGE_FILE_MACHINE_AMD64;
 655   stack_frame.AddrPC.Offset = ctx.Rip;
 656   stack_frame.AddrFrame.Offset = ctx.Rbp;
 657   stack_frame.AddrStack.Offset = ctx.Rsp;
 658 #else
 659   int machine_type = IMAGE_FILE_MACHINE_I386;
 660   stack_frame.AddrPC.Offset = ctx.Eip;
 661   stack_frame.AddrFrame.Offset = ctx.Ebp;
 662   stack_frame.AddrStack.Offset = ctx.Esp;
 663 #endif
 664   stack_frame.AddrPC.Mode = AddrModeFlat;
 665   stack_frame.AddrFrame.Mode = AddrModeFlat;
 666   stack_frame.AddrStack.Mode = AddrModeFlat;
 667   while (StackWalk64(machine_type, GetCurrentProcess(), GetCurrentThread(),
 668                      &stack_frame, &ctx, NULL, &SymFunctionTableAccess64,
 669                      &SymGetModuleBase64, NULL) &&
 670          size < Min(max_depth, kStackTraceMax)) {
 671     trace_buffer[size++] = (uptr)stack_frame.AddrPC.Offset;
 672   }
 673 }
 674 #endif  // #if !SANITIZER_GO
 675
 676 void ReportFile::Write(const char *buffer, uptr length) {
 677   SpinMutexLock l(mu);
 678   ReopenIfNecessary();
 679   if (!WriteToFile(fd, buffer, length)) {
 680     // stderr may be closed, but we may be able to print to the debugger
 681     // instead.  This is the case when launching a program from Visual Studio,
 682     // and the following routine should write to its console.
 683     OutputDebugStringA(buffer);
 684   }
 685 }
 686
 687 void SetAlternateSignalStack() {
 688   // FIXME: Decide what to do on Windows.
 689 }
 690
 691 void UnsetAlternateSignalStack() {
 692   // FIXME: Decide what to do on Windows.
 693 }
 694
 695 void InstallDeadlySignalHandlers(SignalHandlerType handler) {
 696   (void)handler;
 697   // FIXME: Decide what to do on Windows.
 698 }
 699
 700 bool IsDeadlySignal(int signum) {
 701   // FIXME: Decide what to do on Windows.
 702   return false;
 703 }
 704
 705 bool IsAccessibleMemoryRange(uptr beg, uptr size) {
 706   SYSTEM_INFO si;
 707   GetNativeSystemInfo(&si);
 708   uptr page_size = si.dwPageSize;
 709   uptr page_mask = ~(page_size - 1);
 710
 711   for (uptr page = beg & page_mask, end = (beg + size - 1) & page_mask;
 712        page <= end;) {
 713     MEMORY_BASIC_INFORMATION info;
 714     if (VirtualQuery((LPCVOID)page, &info, sizeof(info)) != sizeof(info))
 715       return false;
 716
 717     if (info.Protect == 0 || info.Protect == PAGE_NOACCESS ||
 718         info.Protect == PAGE_EXECUTE)
 719       return false;
 720
 721     if (info.RegionSize == 0)
 722       return false;
 723
 724     page += info.RegionSize;
 725   }
 726
 727   return true;
 728 }
 729
 730 SignalContext SignalContext::Create(void *siginfo, void *context) {
 731   EXCEPTION_RECORD *exception_record = (EXCEPTION_RECORD*)siginfo;
 732   CONTEXT *context_record = (CONTEXT*)context;
 733
 734   uptr pc = (uptr)exception_record->ExceptionAddress;
 735 #ifdef _WIN64
 736   uptr bp = (uptr)context_record->Rbp;
 737   uptr sp = (uptr)context_record->Rsp;
 738 #else
 739   uptr bp = (uptr)context_record->Ebp;
 740   uptr sp = (uptr)context_record->Esp;
 741 #endif
 742   uptr access_addr = exception_record->ExceptionInformation[1];
 743
 744   return SignalContext(context, access_addr, pc, sp, bp);
 745 }
 746
 747 uptr ReadBinaryName(/*out*/char *buf, uptr buf_len) {
 748   // FIXME: Actually implement this function.
 749   CHECK_GT(buf_len, 0);
 750   buf[0] = 0;
 751   return 0;
 752 }
 753
 754 uptr ReadLongProcessName(/*out*/char *buf, uptr buf_len) {
 755   return ReadBinaryName(buf, buf_len);
 756 }
 757
 758 void CheckVMASize() {
 759   // Do nothing.
 760 }
 761
 762 }  // namespace __sanitizer
 763
 764 #endif  // _WIN32