1 //===-- sanitizer_win.cc --------------------------------------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file is shared between AddressSanitizer and ThreadSanitizer
11 // run-time libraries and implements windows-specific functions from
13 //===----------------------------------------------------------------------===//
15 #include "sanitizer_platform.h"
18 #define WIN32_LEAN_AND_MEAN
25 #include "sanitizer_common.h"
26 #include "sanitizer_dbghelp.h"
27 #include "sanitizer_libc.h"
28 #include "sanitizer_mutex.h"
29 #include "sanitizer_placement_new.h"
30 #include "sanitizer_procmaps.h"
31 #include "sanitizer_stacktrace.h"
32 #include "sanitizer_symbolizer.h"
33 #include "sanitizer_win_defs.h"
35 // A macro to tell the compiler that this part of the code cannot be reached,
36 // if the compiler supports this feature. Since we're using this in
37 // code that is called when terminating the process, the expansion of the
38 // macro should not terminate the process to avoid infinite recursion.
39 #if defined(__clang__)
40 # define BUILTIN_UNREACHABLE() __builtin_unreachable()
41 #elif defined(__GNUC__) && \
42 (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 5))
43 # define BUILTIN_UNREACHABLE() __builtin_unreachable()
44 #elif defined(_MSC_VER)
45 # define BUILTIN_UNREACHABLE() __assume(0)
47 # define BUILTIN_UNREACHABLE()
50 namespace __sanitizer {
52 #include "sanitizer_syscall_generic.inc"
54 // --------------------- sanitizer_common.h
61 uptr GetMmapGranularity() {
64 return si.dwAllocationGranularity;
67 uptr GetMaxVirtualAddress() {
70 return (uptr)si.lpMaximumApplicationAddress;
73 bool FileExists(const char *filename) {
74 return ::GetFileAttributesA(filename) != INVALID_FILE_ATTRIBUTES;
77 uptr internal_getpid() {
78 return GetProcessId(GetCurrentProcess());
81 // In contrast to POSIX, on Windows GetCurrentThreadId()
82 // returns a system-unique identifier.
84 return GetCurrentThreadId();
87 uptr GetThreadSelf() {
92 void GetThreadStackTopAndBottom(bool at_initialization, uptr *stack_top,
96 MEMORY_BASIC_INFORMATION mbi;
97 CHECK_NE(VirtualQuery(&mbi /* on stack */, &mbi, sizeof(mbi)), 0);
98 // FIXME: is it possible for the stack to not be a single allocation?
99 // Are these values what ASan expects to get (reserved, not committed;
100 // including stack guard page) ?
101 *stack_top = (uptr)mbi.BaseAddress + mbi.RegionSize;
102 *stack_bottom = (uptr)mbi.AllocationBase;
104 #endif // #if !SANITIZER_GO
106 void *MmapOrDie(uptr size, const char *mem_type, bool raw_report) {
107 void *rv = VirtualAlloc(0, size, MEM_RESERVE | MEM_COMMIT, PAGE_READWRITE);
109 ReportMmapFailureAndDie(size, mem_type, "allocate",
110 GetLastError(), raw_report);
114 void UnmapOrDie(void *addr, uptr size) {
118 MEMORY_BASIC_INFORMATION mbi;
119 CHECK(VirtualQuery(addr, &mbi, sizeof(mbi)));
121 // MEM_RELEASE can only be used to unmap whole regions previously mapped with
122 // VirtualAlloc. So we first try MEM_RELEASE since it is better, and if that
123 // fails try MEM_DECOMMIT.
124 if (VirtualFree(addr, 0, MEM_RELEASE) == 0) {
125 if (VirtualFree(addr, size, MEM_DECOMMIT) == 0) {
126 Report("ERROR: %s failed to "
127 "deallocate 0x%zx (%zd) bytes at address %p (error code: %d)\n",
128 SanitizerToolName, size, size, addr, GetLastError());
129 CHECK("unable to unmap" && 0);
134 static void *ReturnNullptrOnOOMOrDie(uptr size, const char *mem_type,
135 const char *mmap_type) {
136 error_t last_error = GetLastError();
137 if (last_error == ERROR_NOT_ENOUGH_MEMORY)
139 ReportMmapFailureAndDie(size, mem_type, mmap_type, last_error);
142 void *MmapOrDieOnFatalError(uptr size, const char *mem_type) {
143 void *rv = VirtualAlloc(0, size, MEM_RESERVE | MEM_COMMIT, PAGE_READWRITE);
145 return ReturnNullptrOnOOMOrDie(size, mem_type, "allocate");
149 // We want to map a chunk of address space aligned to 'alignment'.
150 void *MmapAlignedOrDieOnFatalError(uptr size, uptr alignment,
151 const char *mem_type) {
152 CHECK(IsPowerOfTwo(size));
153 CHECK(IsPowerOfTwo(alignment));
155 // Windows will align our allocations to at least 64K.
156 alignment = Max(alignment, GetMmapGranularity());
159 (uptr)VirtualAlloc(0, size, MEM_RESERVE | MEM_COMMIT, PAGE_READWRITE);
161 return ReturnNullptrOnOOMOrDie(size, mem_type, "allocate aligned");
163 // If we got it right on the first try, return. Otherwise, unmap it and go to
165 if (IsAligned(mapped_addr, alignment))
166 return (void*)mapped_addr;
167 if (VirtualFree((void *)mapped_addr, 0, MEM_RELEASE) == 0)
168 ReportMmapFailureAndDie(size, mem_type, "deallocate", GetLastError());
170 // If we didn't get an aligned address, overallocate, find an aligned address,
171 // unmap, and try to allocate at that aligned address.
173 const int kMaxRetries = 10;
174 for (; retries < kMaxRetries &&
175 (mapped_addr == 0 || !IsAligned(mapped_addr, alignment));
177 // Overallocate size + alignment bytes.
179 (uptr)VirtualAlloc(0, size + alignment, MEM_RESERVE, PAGE_NOACCESS);
181 return ReturnNullptrOnOOMOrDie(size, mem_type, "allocate aligned");
183 // Find the aligned address.
184 uptr aligned_addr = RoundUpTo(mapped_addr, alignment);
186 // Free the overallocation.
187 if (VirtualFree((void *)mapped_addr, 0, MEM_RELEASE) == 0)
188 ReportMmapFailureAndDie(size, mem_type, "deallocate", GetLastError());
190 // Attempt to allocate exactly the number of bytes we need at the aligned
191 // address. This may fail for a number of reasons, in which case we continue
193 mapped_addr = (uptr)VirtualAlloc((void *)aligned_addr, size,
194 MEM_RESERVE | MEM_COMMIT, PAGE_READWRITE);
197 // Fail if we can't make this work quickly.
198 if (retries == kMaxRetries && mapped_addr == 0)
199 return ReturnNullptrOnOOMOrDie(size, mem_type, "allocate aligned");
201 return (void *)mapped_addr;
204 void *MmapFixedNoReserve(uptr fixed_addr, uptr size, const char *name) {
205 // FIXME: is this really "NoReserve"? On Win32 this does not matter much,
206 // but on Win64 it does.
207 (void)name; // unsupported
208 #if !SANITIZER_GO && SANITIZER_WINDOWS64
209 // On asan/Windows64, use MEM_COMMIT would result in error
210 // 1455:ERROR_COMMITMENT_LIMIT.
211 // Asan uses exception handler to commit page on demand.
212 void *p = VirtualAlloc((LPVOID)fixed_addr, size, MEM_RESERVE, PAGE_READWRITE);
214 void *p = VirtualAlloc((LPVOID)fixed_addr, size, MEM_RESERVE | MEM_COMMIT,
218 Report("ERROR: %s failed to "
219 "allocate %p (%zd) bytes at %p (error code: %d)\n",
220 SanitizerToolName, size, size, fixed_addr, GetLastError());
224 // Memory space mapped by 'MmapFixedOrDie' must have been reserved by
225 // 'MmapFixedNoAccess'.
226 void *MmapFixedOrDie(uptr fixed_addr, uptr size) {
227 void *p = VirtualAlloc((LPVOID)fixed_addr, size,
228 MEM_COMMIT, PAGE_READWRITE);
231 internal_snprintf(mem_type, sizeof(mem_type), "memory at address 0x%zx",
233 ReportMmapFailureAndDie(size, mem_type, "allocate", GetLastError());
238 void *MmapNoReserveOrDie(uptr size, const char *mem_type) {
239 // FIXME: make this really NoReserve?
240 return MmapOrDie(size, mem_type);
243 void *MmapFixedNoAccess(uptr fixed_addr, uptr size, const char *name) {
244 (void)name; // unsupported
245 void *res = VirtualAlloc((LPVOID)fixed_addr, size,
246 MEM_RESERVE, PAGE_NOACCESS);
248 Report("WARNING: %s failed to "
249 "mprotect %p (%zd) bytes at %p (error code: %d)\n",
250 SanitizerToolName, size, size, fixed_addr, GetLastError());
254 void *MmapNoAccess(uptr size) {
255 void *res = VirtualAlloc(nullptr, size, MEM_RESERVE, PAGE_NOACCESS);
257 Report("WARNING: %s failed to "
258 "mprotect %p (%zd) bytes (error code: %d)\n",
259 SanitizerToolName, size, size, GetLastError());
263 bool MprotectNoAccess(uptr addr, uptr size) {
264 DWORD old_protection;
265 return VirtualProtect((LPVOID)addr, size, PAGE_NOACCESS, &old_protection);
268 void ReleaseMemoryPagesToOS(uptr beg, uptr end) {
269 // This is almost useless on 32-bits.
270 // FIXME: add madvise-analog when we move to 64-bits.
273 void NoHugePagesInRegion(uptr addr, uptr size) {
274 // FIXME: probably similar to ReleaseMemoryToOS.
277 void DontDumpShadowMemory(uptr addr, uptr length) {
278 // This is almost useless on 32-bits.
279 // FIXME: add madvise-analog when we move to 64-bits.
282 uptr FindAvailableMemoryRange(uptr size, uptr alignment, uptr left_padding) {
285 MEMORY_BASIC_INFORMATION info;
286 if (!::VirtualQuery((void*)address, &info, sizeof(info)))
289 if (info.State == MEM_FREE) {
290 uptr shadow_address = RoundUpTo((uptr)info.BaseAddress + left_padding,
292 if (shadow_address + size < (uptr)info.BaseAddress + info.RegionSize)
293 return shadow_address;
296 // Move to the next region.
297 address = (uptr)info.BaseAddress + info.RegionSize;
302 bool MemoryRangeIsAvailable(uptr range_start, uptr range_end) {
303 MEMORY_BASIC_INFORMATION mbi;
304 CHECK(VirtualQuery((void *)range_start, &mbi, sizeof(mbi)));
305 return mbi.Protect == PAGE_NOACCESS &&
306 (uptr)mbi.BaseAddress + mbi.RegionSize >= range_end;
309 void *MapFileToMemory(const char *file_name, uptr *buff_size) {
313 void *MapWritableFileToMemory(void *addr, uptr size, fd_t fd, OFF_T offset) {
317 static const int kMaxEnvNameLength = 128;
318 static const DWORD kMaxEnvValueLength = 32767;
323 char name[kMaxEnvNameLength];
324 char value[kMaxEnvValueLength];
329 static const int kEnvVariables = 5;
330 static EnvVariable env_vars[kEnvVariables];
331 static int num_env_vars;
333 const char *GetEnv(const char *name) {
334 // Note: this implementation caches the values of the environment variables
335 // and limits their quantity.
336 for (int i = 0; i < num_env_vars; i++) {
337 if (0 == internal_strcmp(name, env_vars[i].name))
338 return env_vars[i].value;
340 CHECK_LT(num_env_vars, kEnvVariables);
341 DWORD rv = GetEnvironmentVariableA(name, env_vars[num_env_vars].value,
343 if (rv > 0 && rv < kMaxEnvValueLength) {
344 CHECK_LT(internal_strlen(name), kMaxEnvNameLength);
345 internal_strncpy(env_vars[num_env_vars].name, name, kMaxEnvNameLength);
347 return env_vars[num_env_vars - 1].value;
352 const char *GetPwd() {
362 const char *filepath;
368 int CompareModulesBase(const void *pl, const void *pr) {
369 const ModuleInfo *l = (ModuleInfo *)pl, *r = (ModuleInfo *)pr;
370 if (l->base_address < r->base_address)
372 return l->base_address > r->base_address;
378 void DumpProcessMap() {
379 Report("Dumping process modules:\n");
380 ListOfModules modules;
382 uptr num_modules = modules.size();
384 InternalScopedBuffer<ModuleInfo> module_infos(num_modules);
385 for (size_t i = 0; i < num_modules; ++i) {
386 module_infos[i].filepath = modules[i].full_name();
387 module_infos[i].base_address = modules[i].ranges().front()->beg;
388 module_infos[i].end_address = modules[i].ranges().back()->end;
390 qsort(module_infos.data(), num_modules, sizeof(ModuleInfo),
393 for (size_t i = 0; i < num_modules; ++i) {
394 const ModuleInfo &mi = module_infos[i];
395 if (mi.end_address != 0) {
396 Printf("\t%p-%p %s\n", mi.base_address, mi.end_address,
397 mi.filepath[0] ? mi.filepath : "[no name]");
398 } else if (mi.filepath[0]) {
399 Printf("\t??\?-??? %s\n", mi.filepath);
407 void PrintModuleMap() { }
409 void DisableCoreDumperIfNecessary() {
417 void PrepareForSandboxing(__sanitizer_sandbox_arguments *args) {
420 bool StackSizeIsUnlimited() {
424 void SetStackSizeLimitInBytes(uptr limit) {
428 bool AddressSpaceIsUnlimited() {
432 void SetAddressSpaceUnlimited() {
436 bool IsPathSeparator(const char c) {
437 return c == '\\' || c == '/';
440 bool IsAbsolutePath(const char *path) {
444 void SleepForSeconds(int seconds) {
445 Sleep(seconds * 1000);
448 void SleepForMillis(int millis) {
461 // Read the file to extract the ImageBase field from the PE header. If ASLR is
462 // disabled and this virtual address is available, the loader will typically
463 // load the image at this address. Therefore, we call it the preferred base. Any
464 // addresses in the DWARF typically assume that the object has been loaded at
466 static uptr GetPreferredBase(const char *modname) {
467 fd_t fd = OpenFile(modname, RdOnly, nullptr);
468 if (fd == kInvalidFd)
470 FileCloser closer(fd);
472 // Read just the DOS header.
473 IMAGE_DOS_HEADER dos_header;
475 if (!ReadFromFile(fd, &dos_header, sizeof(dos_header), &bytes_read) ||
476 bytes_read != sizeof(dos_header))
479 // The file should start with the right signature.
480 if (dos_header.e_magic != IMAGE_DOS_SIGNATURE)
483 // The layout at e_lfanew is:
486 // IMAGE_OPTIONAL_HEADER
487 // Seek to e_lfanew and read all that data.
488 char buf[4 + sizeof(IMAGE_FILE_HEADER) + sizeof(IMAGE_OPTIONAL_HEADER)];
489 if (::SetFilePointer(fd, dos_header.e_lfanew, nullptr, FILE_BEGIN) ==
490 INVALID_SET_FILE_POINTER)
492 if (!ReadFromFile(fd, &buf[0], sizeof(buf), &bytes_read) ||
493 bytes_read != sizeof(buf))
496 // Check for "PE\0\0" before the PE header.
497 char *pe_sig = &buf[0];
498 if (internal_memcmp(pe_sig, "PE\0\0", 4) != 0)
501 // Skip over IMAGE_FILE_HEADER. We could do more validation here if we wanted.
502 IMAGE_OPTIONAL_HEADER *pe_header =
503 (IMAGE_OPTIONAL_HEADER *)(pe_sig + 4 + sizeof(IMAGE_FILE_HEADER));
505 // Check for more magic in the PE header.
506 if (pe_header->Magic != IMAGE_NT_OPTIONAL_HDR_MAGIC)
509 // Finally, return the ImageBase.
510 return (uptr)pe_header->ImageBase;
513 void ListOfModules::init() {
515 HANDLE cur_process = GetCurrentProcess();
517 // Query the list of modules. Start by assuming there are no more than 256
518 // modules and retry if that's not sufficient.
519 HMODULE *hmodules = 0;
520 uptr modules_buffer_size = sizeof(HMODULE) * 256;
521 DWORD bytes_required;
523 hmodules = (HMODULE *)MmapOrDie(modules_buffer_size, __FUNCTION__);
524 CHECK(EnumProcessModules(cur_process, hmodules, modules_buffer_size,
526 if (bytes_required > modules_buffer_size) {
527 // Either there turned out to be more than 256 hmodules, or new hmodules
528 // could have loaded since the last try. Retry.
529 UnmapOrDie(hmodules, modules_buffer_size);
531 modules_buffer_size = bytes_required;
535 // |num_modules| is the number of modules actually present,
536 size_t num_modules = bytes_required / sizeof(HMODULE);
537 for (size_t i = 0; i < num_modules; ++i) {
538 HMODULE handle = hmodules[i];
540 if (!GetModuleInformation(cur_process, handle, &mi, sizeof(mi)))
543 // Get the UTF-16 path and convert to UTF-8.
544 wchar_t modname_utf16[kMaxPathLength];
545 int modname_utf16_len =
546 GetModuleFileNameW(handle, modname_utf16, kMaxPathLength);
547 if (modname_utf16_len == 0)
548 modname_utf16[0] = '\0';
549 char module_name[kMaxPathLength];
550 int module_name_len =
551 ::WideCharToMultiByte(CP_UTF8, 0, modname_utf16, modname_utf16_len + 1,
552 &module_name[0], kMaxPathLength, NULL, NULL);
553 module_name[module_name_len] = '\0';
555 uptr base_address = (uptr)mi.lpBaseOfDll;
556 uptr end_address = (uptr)mi.lpBaseOfDll + mi.SizeOfImage;
558 // Adjust the base address of the module so that we get a VA instead of an
559 // RVA when computing the module offset. This helps llvm-symbolizer find the
560 // right DWARF CU. In the common case that the image is loaded at it's
561 // preferred address, we will now print normal virtual addresses.
562 uptr preferred_base = GetPreferredBase(&module_name[0]);
563 uptr adjusted_base = base_address - preferred_base;
565 LoadedModule cur_module;
566 cur_module.set(module_name, adjusted_base);
567 // We add the whole module as one single address range.
568 cur_module.addAddressRange(base_address, end_address, /*executable*/ true,
570 modules_.push_back(cur_module);
572 UnmapOrDie(hmodules, modules_buffer_size);
575 // We can't use atexit() directly at __asan_init time as the CRT is not fully
576 // initialized at this point. Place the functions into a vector and use
577 // atexit() as soon as it is ready for use (i.e. after .CRT$XIC initializers).
578 InternalMmapVectorNoCtor<void (*)(void)> atexit_functions;
580 int Atexit(void (*function)(void)) {
581 atexit_functions.push_back(function);
585 static int RunAtexit() {
587 for (uptr i = 0; i < atexit_functions.size(); ++i) {
588 ret |= atexit(atexit_functions[i]);
593 #pragma section(".CRT$XID", long, read) // NOLINT
594 __declspec(allocate(".CRT$XID")) int (*__run_atexit)() = RunAtexit;
597 // ------------------ sanitizer_libc.h
598 fd_t OpenFile(const char *filename, FileAccessMode mode, error_t *last_error) {
599 // FIXME: Use the wide variants to handle Unicode filenames.
601 if (mode == RdOnly) {
602 res = CreateFileA(filename, GENERIC_READ,
603 FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
604 nullptr, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, nullptr);
605 } else if (mode == WrOnly) {
606 res = CreateFileA(filename, GENERIC_WRITE, 0, nullptr, CREATE_ALWAYS,
607 FILE_ATTRIBUTE_NORMAL, nullptr);
611 CHECK(res != kStdoutFd || kStdoutFd == kInvalidFd);
612 CHECK(res != kStderrFd || kStderrFd == kInvalidFd);
613 if (res == kInvalidFd && last_error)
614 *last_error = GetLastError();
618 void CloseFile(fd_t fd) {
622 bool ReadFromFile(fd_t fd, void *buff, uptr buff_size, uptr *bytes_read,
624 CHECK(fd != kInvalidFd);
626 // bytes_read can't be passed directly to ReadFile:
627 // uptr is unsigned long long on 64-bit Windows.
628 unsigned long num_read_long;
630 bool success = ::ReadFile(fd, buff, buff_size, &num_read_long, nullptr);
631 if (!success && error_p)
632 *error_p = GetLastError();
634 *bytes_read = num_read_long;
638 bool SupportsColoredOutput(fd_t fd) {
639 // FIXME: support colored output.
643 bool WriteToFile(fd_t fd, const void *buff, uptr buff_size, uptr *bytes_written,
645 CHECK(fd != kInvalidFd);
647 // Handle null optional parameters.
649 error_p = error_p ? error_p : &dummy_error;
650 uptr dummy_bytes_written;
651 bytes_written = bytes_written ? bytes_written : &dummy_bytes_written;
653 // Initialize output parameters in case we fail.
657 // Map the conventional Unix fds 1 and 2 to Windows handles. They might be
658 // closed, in which case this will fail.
659 if (fd == kStdoutFd || fd == kStderrFd) {
660 fd = GetStdHandle(fd == kStdoutFd ? STD_OUTPUT_HANDLE : STD_ERROR_HANDLE);
662 *error_p = ERROR_INVALID_HANDLE;
667 DWORD bytes_written_32;
668 if (!WriteFile(fd, buff, buff_size, &bytes_written_32, 0)) {
669 *error_p = GetLastError();
672 *bytes_written = bytes_written_32;
677 bool RenameFile(const char *oldpath, const char *newpath, error_t *error_p) {
681 uptr internal_sched_yield() {
686 void internal__exit(int exitcode) {
687 // ExitProcess runs some finalizers, so use TerminateProcess to avoid that.
688 // The debugger doesn't stop on TerminateProcess like it does on ExitProcess,
689 // so add our own breakpoint here.
690 if (::IsDebuggerPresent())
692 TerminateProcess(GetCurrentProcess(), exitcode);
693 BUILTIN_UNREACHABLE();
696 uptr internal_ftruncate(fd_t fd, uptr size) {
704 void *internal_start_thread(void (*func)(void *arg), void *arg) { return 0; }
705 void internal_join_thread(void *th) { }
707 // ---------------------- BlockingMutex ---------------- {{{1
708 const uptr LOCK_UNINITIALIZED = 0;
709 const uptr LOCK_READY = (uptr)-1;
711 BlockingMutex::BlockingMutex(LinkerInitialized li) {
712 // FIXME: see comments in BlockingMutex::Lock() for the details.
713 CHECK(li == LINKER_INITIALIZED || owner_ == LOCK_UNINITIALIZED);
715 CHECK(sizeof(CRITICAL_SECTION) <= sizeof(opaque_storage_));
716 InitializeCriticalSection((LPCRITICAL_SECTION)opaque_storage_);
720 BlockingMutex::BlockingMutex() {
721 CHECK(sizeof(CRITICAL_SECTION) <= sizeof(opaque_storage_));
722 InitializeCriticalSection((LPCRITICAL_SECTION)opaque_storage_);
726 void BlockingMutex::Lock() {
727 if (owner_ == LOCK_UNINITIALIZED) {
728 // FIXME: hm, global BlockingMutex objects are not initialized?!?
729 // This might be a side effect of the clang+cl+link Frankenbuild...
730 new(this) BlockingMutex((LinkerInitialized)(LINKER_INITIALIZED + 1));
732 // FIXME: If it turns out the linker doesn't invoke our
733 // constructors, we should probably manually Lock/Unlock all the global
734 // locks while we're starting in one thread to avoid double-init races.
736 EnterCriticalSection((LPCRITICAL_SECTION)opaque_storage_);
737 CHECK_EQ(owner_, LOCK_READY);
738 owner_ = GetThreadSelf();
741 void BlockingMutex::Unlock() {
742 CHECK_EQ(owner_, GetThreadSelf());
744 LeaveCriticalSection((LPCRITICAL_SECTION)opaque_storage_);
747 void BlockingMutex::CheckLocked() {
748 CHECK_EQ(owner_, GetThreadSelf());
758 void GetThreadStackAndTls(bool main, uptr *stk_addr, uptr *stk_size,
759 uptr *tls_addr, uptr *tls_size) {
766 uptr stack_top, stack_bottom;
767 GetThreadStackTopAndBottom(main, &stack_top, &stack_bottom);
768 *stk_addr = stack_bottom;
769 *stk_size = stack_top - stack_bottom;
776 void BufferedStackTrace::SlowUnwindStack(uptr pc, u32 max_depth) {
777 CHECK_GE(max_depth, 2);
778 // FIXME: CaptureStackBackTrace might be too slow for us.
779 // FIXME: Compare with StackWalk64.
780 // FIXME: Look at LLVMUnhandledExceptionFilter in Signals.inc
781 size = CaptureStackBackTrace(1, Min(max_depth, kStackTraceMax),
786 // Skip the RTL frames by searching for the PC in the stacktrace.
787 uptr pc_location = LocatePcInTrace(pc);
788 PopStackFrames(pc_location);
791 void BufferedStackTrace::SlowUnwindStackWithContext(uptr pc, void *context,
793 CONTEXT ctx = *(CONTEXT *)context;
794 STACKFRAME64 stack_frame;
795 memset(&stack_frame, 0, sizeof(stack_frame));
797 InitializeDbgHelpIfNeeded();
801 int machine_type = IMAGE_FILE_MACHINE_AMD64;
802 stack_frame.AddrPC.Offset = ctx.Rip;
803 stack_frame.AddrFrame.Offset = ctx.Rbp;
804 stack_frame.AddrStack.Offset = ctx.Rsp;
806 int machine_type = IMAGE_FILE_MACHINE_I386;
807 stack_frame.AddrPC.Offset = ctx.Eip;
808 stack_frame.AddrFrame.Offset = ctx.Ebp;
809 stack_frame.AddrStack.Offset = ctx.Esp;
811 stack_frame.AddrPC.Mode = AddrModeFlat;
812 stack_frame.AddrFrame.Mode = AddrModeFlat;
813 stack_frame.AddrStack.Mode = AddrModeFlat;
814 while (StackWalk64(machine_type, GetCurrentProcess(), GetCurrentThread(),
815 &stack_frame, &ctx, NULL, SymFunctionTableAccess64,
816 SymGetModuleBase64, NULL) &&
817 size < Min(max_depth, kStackTraceMax)) {
818 trace_buffer[size++] = (uptr)stack_frame.AddrPC.Offset;
821 #endif // #if !SANITIZER_GO
823 void ReportFile::Write(const char *buffer, uptr length) {
826 if (!WriteToFile(fd, buffer, length)) {
827 // stderr may be closed, but we may be able to print to the debugger
828 // instead. This is the case when launching a program from Visual Studio,
829 // and the following routine should write to its console.
830 OutputDebugStringA(buffer);
834 void SetAlternateSignalStack() {
835 // FIXME: Decide what to do on Windows.
838 void UnsetAlternateSignalStack() {
839 // FIXME: Decide what to do on Windows.
842 void InstallDeadlySignalHandlers(SignalHandlerType handler) {
844 // FIXME: Decide what to do on Windows.
847 HandleSignalMode GetHandleSignalMode(int signum) {
848 // FIXME: Decide what to do on Windows.
849 return kHandleSignalNo;
852 // Check based on flags if we should handle this exception.
853 bool IsHandledDeadlyException(DWORD exceptionCode) {
854 switch (exceptionCode) {
855 case EXCEPTION_ACCESS_VIOLATION:
856 case EXCEPTION_ARRAY_BOUNDS_EXCEEDED:
857 case EXCEPTION_STACK_OVERFLOW:
858 case EXCEPTION_DATATYPE_MISALIGNMENT:
859 case EXCEPTION_IN_PAGE_ERROR:
860 return common_flags()->handle_segv;
861 case EXCEPTION_ILLEGAL_INSTRUCTION:
862 case EXCEPTION_PRIV_INSTRUCTION:
863 case EXCEPTION_BREAKPOINT:
864 return common_flags()->handle_sigill;
865 case EXCEPTION_FLT_DENORMAL_OPERAND:
866 case EXCEPTION_FLT_DIVIDE_BY_ZERO:
867 case EXCEPTION_FLT_INEXACT_RESULT:
868 case EXCEPTION_FLT_INVALID_OPERATION:
869 case EXCEPTION_FLT_OVERFLOW:
870 case EXCEPTION_FLT_STACK_CHECK:
871 case EXCEPTION_FLT_UNDERFLOW:
872 case EXCEPTION_INT_DIVIDE_BY_ZERO:
873 case EXCEPTION_INT_OVERFLOW:
874 return common_flags()->handle_sigfpe;
879 const char *DescribeSignalOrException(int signo) {
880 unsigned code = signo;
881 // Get the string description of the exception if this is a known deadly
884 case EXCEPTION_ACCESS_VIOLATION: return "access-violation";
885 case EXCEPTION_ARRAY_BOUNDS_EXCEEDED: return "array-bounds-exceeded";
886 case EXCEPTION_STACK_OVERFLOW: return "stack-overflow";
887 case EXCEPTION_DATATYPE_MISALIGNMENT: return "datatype-misalignment";
888 case EXCEPTION_IN_PAGE_ERROR: return "in-page-error";
889 case EXCEPTION_ILLEGAL_INSTRUCTION: return "illegal-instruction";
890 case EXCEPTION_PRIV_INSTRUCTION: return "priv-instruction";
891 case EXCEPTION_BREAKPOINT: return "breakpoint";
892 case EXCEPTION_FLT_DENORMAL_OPERAND: return "flt-denormal-operand";
893 case EXCEPTION_FLT_DIVIDE_BY_ZERO: return "flt-divide-by-zero";
894 case EXCEPTION_FLT_INEXACT_RESULT: return "flt-inexact-result";
895 case EXCEPTION_FLT_INVALID_OPERATION: return "flt-invalid-operation";
896 case EXCEPTION_FLT_OVERFLOW: return "flt-overflow";
897 case EXCEPTION_FLT_STACK_CHECK: return "flt-stack-check";
898 case EXCEPTION_FLT_UNDERFLOW: return "flt-underflow";
899 case EXCEPTION_INT_DIVIDE_BY_ZERO: return "int-divide-by-zero";
900 case EXCEPTION_INT_OVERFLOW: return "int-overflow";
902 return "unknown exception";
905 bool IsAccessibleMemoryRange(uptr beg, uptr size) {
907 GetNativeSystemInfo(&si);
908 uptr page_size = si.dwPageSize;
909 uptr page_mask = ~(page_size - 1);
911 for (uptr page = beg & page_mask, end = (beg + size - 1) & page_mask;
913 MEMORY_BASIC_INFORMATION info;
914 if (VirtualQuery((LPCVOID)page, &info, sizeof(info)) != sizeof(info))
917 if (info.Protect == 0 || info.Protect == PAGE_NOACCESS ||
918 info.Protect == PAGE_EXECUTE)
921 if (info.RegionSize == 0)
924 page += info.RegionSize;
930 SignalContext SignalContext::Create(void *siginfo, void *context) {
931 EXCEPTION_RECORD *exception_record = (EXCEPTION_RECORD *)siginfo;
932 CONTEXT *context_record = (CONTEXT *)context;
934 uptr pc = (uptr)exception_record->ExceptionAddress;
936 uptr bp = (uptr)context_record->Rbp;
937 uptr sp = (uptr)context_record->Rsp;
939 uptr bp = (uptr)context_record->Ebp;
940 uptr sp = (uptr)context_record->Esp;
942 uptr access_addr = exception_record->ExceptionInformation[1];
944 // The contents of this array are documented at
945 // https://msdn.microsoft.com/en-us/library/windows/desktop/aa363082(v=vs.85).aspx
946 // The first element indicates read as 0, write as 1, or execute as 8. The
947 // second element is the faulting address.
948 WriteFlag write_flag = SignalContext::UNKNOWN;
949 switch (exception_record->ExceptionInformation[0]) {
950 case 0: write_flag = SignalContext::READ; break;
951 case 1: write_flag = SignalContext::WRITE; break;
952 case 8: write_flag = SignalContext::UNKNOWN; break;
954 bool is_memory_access = write_flag != SignalContext::UNKNOWN;
955 return SignalContext(context, access_addr, pc, sp, bp, is_memory_access,
959 void SignalContext::DumpAllRegisters(void *context) {
960 // FIXME: Implement this.
963 uptr ReadBinaryName(/*out*/char *buf, uptr buf_len) {
964 // FIXME: Actually implement this function.
965 CHECK_GT(buf_len, 0);
970 uptr ReadLongProcessName(/*out*/char *buf, uptr buf_len) {
971 return ReadBinaryName(buf, buf_len);
974 void CheckVMASize() {
979 // No need to re-exec on Windows.
983 // FIXME: Actually implement this function.
987 pid_t StartSubprocess(const char *program, const char *const argv[],
988 fd_t stdin_fd, fd_t stdout_fd, fd_t stderr_fd) {
989 // FIXME: implement on this platform
990 // Should be implemented based on
991 // SymbolizerProcess::StarAtSymbolizerSubprocess
992 // from lib/sanitizer_common/sanitizer_symbolizer_win.cc.
996 bool IsProcessRunning(pid_t pid) {
997 // FIXME: implement on this platform.
1001 int WaitForProcess(pid_t pid) { return -1; }
1003 // FIXME implement on this platform.
1004 void GetMemoryProfile(fill_profile_f cb, uptr *stats, uptr stats_size) { }
1006 void CheckNoDeepBind(const char *filename, int flag) {
1010 // FIXME: implement on this platform.
1011 bool GetRandom(void *buffer, uptr length) {
1015 } // namespace __sanitizer