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-rw-r--r--mozglue/misc/WindowsMapRemoteView.cpp124
1 files changed, 124 insertions, 0 deletions
diff --git a/mozglue/misc/WindowsMapRemoteView.cpp b/mozglue/misc/WindowsMapRemoteView.cpp
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+++ b/mozglue/misc/WindowsMapRemoteView.cpp
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
+
+#include "mozilla/WindowsMapRemoteView.h"
+
+#include "mozilla/Assertions.h"
+#include "mozilla/DynamicallyLinkedFunctionPtr.h"
+
+#include <winternl.h>
+
+#if (NTDDI_VERSION < NTDDI_WIN10_RS2)
+
+// MapViewOfFile2 is just an inline function that calls MapViewOfFileNuma2 with
+// its preferred node set to NUMA_NO_PREFERRED_NODE
+WINBASEAPI PVOID WINAPI MapViewOfFileNuma2(HANDLE aFileMapping, HANDLE aProcess,
+ ULONG64 aOffset, PVOID aBaseAddress,
+ SIZE_T aViewSize,
+ ULONG aAllocationType,
+ ULONG aPageProtection,
+ ULONG aPreferredNode);
+
+WINBASEAPI BOOL WINAPI UnmapViewOfFile2(HANDLE aProcess, PVOID aBaseAddress,
+ ULONG aUnmapFlags);
+
+#endif // (NTDDI_VERSION < NTDDI_WIN10_RS2)
+
+enum SECTION_INHERIT { ViewShare = 1, ViewUnmap = 2 };
+
+NTSTATUS NTAPI NtMapViewOfSection(
+ HANDLE aSection, HANDLE aProcess, PVOID* aBaseAddress, ULONG_PTR aZeroBits,
+ SIZE_T aCommitSize, PLARGE_INTEGER aSectionOffset, PSIZE_T aViewSize,
+ SECTION_INHERIT aInheritDisposition, ULONG aAllocationType,
+ ULONG aProtectionFlags);
+
+NTSTATUS NTAPI NtUnmapViewOfSection(HANDLE aProcess, PVOID aBaseAddress);
+
+static DWORD GetWin32ErrorCode(NTSTATUS aNtStatus) {
+ static const mozilla::StaticDynamicallyLinkedFunctionPtr<
+ decltype(&RtlNtStatusToDosError)>
+ pRtlNtStatusToDosError(L"ntdll.dll", "RtlNtStatusToDosError");
+
+ MOZ_ASSERT(!!pRtlNtStatusToDosError);
+ if (!pRtlNtStatusToDosError) {
+ return ERROR_GEN_FAILURE;
+ }
+
+ return pRtlNtStatusToDosError(aNtStatus);
+}
+
+namespace mozilla {
+
+MFBT_API void* MapRemoteViewOfFile(HANDLE aFileMapping, HANDLE aProcess,
+ ULONG64 aOffset, PVOID aBaseAddress,
+ SIZE_T aViewSize, ULONG aAllocationType,
+ ULONG aProtectionFlags) {
+ static const StaticDynamicallyLinkedFunctionPtr<decltype(&MapViewOfFileNuma2)>
+ pMapViewOfFileNuma2(L"Api-ms-win-core-memory-l1-1-5.dll",
+ "MapViewOfFileNuma2");
+
+ if (!!pMapViewOfFileNuma2) {
+ return pMapViewOfFileNuma2(aFileMapping, aProcess, aOffset, aBaseAddress,
+ aViewSize, aAllocationType, aProtectionFlags,
+ NUMA_NO_PREFERRED_NODE);
+ }
+
+ static const StaticDynamicallyLinkedFunctionPtr<decltype(&NtMapViewOfSection)>
+ pNtMapViewOfSection(L"ntdll.dll", "NtMapViewOfSection");
+
+ MOZ_ASSERT(!!pNtMapViewOfSection);
+ if (!pNtMapViewOfSection) {
+ return nullptr;
+ }
+
+ // For the sake of consistency, we only permit the same flags that
+ // MapViewOfFileNuma2 allows
+ if (aAllocationType != 0 && aAllocationType != MEM_RESERVE &&
+ aAllocationType != MEM_LARGE_PAGES) {
+ ::SetLastError(ERROR_INVALID_PARAMETER);
+ return nullptr;
+ }
+
+ NTSTATUS ntStatus;
+
+ LARGE_INTEGER offset;
+ offset.QuadPart = aOffset;
+
+ ntStatus = pNtMapViewOfSection(aFileMapping, aProcess, &aBaseAddress, 0, 0,
+ &offset, &aViewSize, ViewUnmap,
+ aAllocationType, aProtectionFlags);
+ if (NT_SUCCESS(ntStatus)) {
+ ::SetLastError(ERROR_SUCCESS);
+ return aBaseAddress;
+ }
+
+ ::SetLastError(GetWin32ErrorCode(ntStatus));
+ return nullptr;
+}
+
+MFBT_API bool UnmapRemoteViewOfFile(HANDLE aProcess, PVOID aBaseAddress) {
+ static const StaticDynamicallyLinkedFunctionPtr<decltype(&UnmapViewOfFile2)>
+ pUnmapViewOfFile2(L"kernel32.dll", "UnmapViewOfFile2");
+
+ if (!!pUnmapViewOfFile2) {
+ return !!pUnmapViewOfFile2(aProcess, aBaseAddress, 0);
+ }
+
+ static const StaticDynamicallyLinkedFunctionPtr<
+ decltype(&NtUnmapViewOfSection)>
+ pNtUnmapViewOfSection(L"ntdll.dll", "NtUnmapViewOfSection");
+
+ MOZ_ASSERT(!!pNtUnmapViewOfSection);
+ if (!pNtUnmapViewOfSection) {
+ return false;
+ }
+
+ NTSTATUS ntStatus = pNtUnmapViewOfSection(aProcess, aBaseAddress);
+ ::SetLastError(GetWin32ErrorCode(ntStatus));
+ return NT_SUCCESS(ntStatus);
+}
+
+} // namespace mozilla