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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
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