mirror of
https://github.com/Ryujinx/Ryujinx.git
synced 2024-12-30 01:26:02 +00:00
736 lines
No EOL
29 KiB
C#
736 lines
No EOL
29 KiB
C#
using Ryujinx.Common.Collections;
|
|
using Ryujinx.Common.Memory.PartialUnmaps;
|
|
using System;
|
|
using System.Diagnostics;
|
|
using System.Runtime.CompilerServices;
|
|
using System.Runtime.Versioning;
|
|
using System.Threading;
|
|
|
|
namespace Ryujinx.Memory.WindowsShared
|
|
{
|
|
/// <summary>
|
|
/// Windows memory placeholder manager.
|
|
/// </summary>
|
|
[SupportedOSPlatform("windows")]
|
|
class PlaceholderManager
|
|
{
|
|
private const int InitialOverlapsSize = 10;
|
|
|
|
private readonly MappingTree<ulong> _mappings;
|
|
private readonly MappingTree<MemoryPermission> _protections;
|
|
private readonly IntPtr _partialUnmapStatePtr;
|
|
private readonly Thread _partialUnmapTrimThread;
|
|
|
|
/// <summary>
|
|
/// Creates a new instance of the Windows memory placeholder manager.
|
|
/// </summary>
|
|
public PlaceholderManager()
|
|
{
|
|
_mappings = new MappingTree<ulong>();
|
|
_protections = new MappingTree<MemoryPermission>();
|
|
|
|
_partialUnmapStatePtr = PartialUnmapState.GlobalState;
|
|
|
|
_partialUnmapTrimThread = new Thread(TrimThreadLocalMapLoop);
|
|
_partialUnmapTrimThread.Name = "CPU.PartialUnmapTrimThread";
|
|
_partialUnmapTrimThread.IsBackground = true;
|
|
_partialUnmapTrimThread.Start();
|
|
}
|
|
|
|
/// <summary>
|
|
/// Gets a reference to the partial unmap state struct.
|
|
/// </summary>
|
|
/// <returns>A reference to the partial unmap state struct</returns>
|
|
private unsafe ref PartialUnmapState GetPartialUnmapState()
|
|
{
|
|
return ref Unsafe.AsRef<PartialUnmapState>((void*)_partialUnmapStatePtr);
|
|
}
|
|
|
|
/// <summary>
|
|
/// Trims inactive threads from the partial unmap state's thread mapping every few seconds.
|
|
/// Should be run in a Background thread so that it doesn't stop the program from closing.
|
|
/// </summary>
|
|
private void TrimThreadLocalMapLoop()
|
|
{
|
|
while (true)
|
|
{
|
|
Thread.Sleep(2000);
|
|
GetPartialUnmapState().TrimThreads();
|
|
}
|
|
}
|
|
|
|
/// <summary>
|
|
/// Reserves a range of the address space to be later mapped as shared memory views.
|
|
/// </summary>
|
|
/// <param name="address">Start address of the region to reserve</param>
|
|
/// <param name="size">Size in bytes of the region to reserve</param>
|
|
public void ReserveRange(ulong address, ulong size)
|
|
{
|
|
lock (_mappings)
|
|
{
|
|
_mappings.Add(new RangeNode<ulong>(address, address + size, ulong.MaxValue));
|
|
}
|
|
|
|
lock (_protections)
|
|
{
|
|
_protections.Add(new RangeNode<MemoryPermission>(address, address + size, MemoryPermission.None));
|
|
}
|
|
}
|
|
|
|
/// <summary>
|
|
/// Unreserves a range of memory that has been previously reserved with <see cref="ReserveRange"/>.
|
|
/// </summary>
|
|
/// <param name="address">Start address of the region to unreserve</param>
|
|
/// <param name="size">Size in bytes of the region to unreserve</param>
|
|
/// <exception cref="WindowsApiException">Thrown when the Windows API returns an error unreserving the memory</exception>
|
|
public void UnreserveRange(ulong address, ulong size)
|
|
{
|
|
ulong endAddress = address + size;
|
|
|
|
lock (_mappings)
|
|
{
|
|
RangeNode<ulong> node = _mappings.GetNodeByKey(address);
|
|
RangeNode<ulong> successorNode;
|
|
|
|
for (; node != null; node = successorNode)
|
|
{
|
|
successorNode = node.Successor;
|
|
|
|
if (IsMapped(node.Value))
|
|
{
|
|
if (!WindowsApi.UnmapViewOfFile2(WindowsApi.CurrentProcessHandle, (IntPtr)node.Start, 2))
|
|
{
|
|
throw new WindowsApiException("UnmapViewOfFile2");
|
|
}
|
|
}
|
|
|
|
_mappings.Remove(node);
|
|
|
|
if (node.End >= endAddress)
|
|
{
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
RemoveProtection(address, size);
|
|
}
|
|
|
|
/// <summary>
|
|
/// Maps a shared memory view on a previously reserved memory region.
|
|
/// </summary>
|
|
/// <param name="sharedMemory">Shared memory that will be the backing storage for the view</param>
|
|
/// <param name="srcOffset">Offset in the shared memory to map</param>
|
|
/// <param name="location">Address to map the view into</param>
|
|
/// <param name="size">Size of the view in bytes</param>
|
|
/// <param name="owner">Memory block that owns the mapping</param>
|
|
public void MapView(IntPtr sharedMemory, ulong srcOffset, IntPtr location, IntPtr size, MemoryBlock owner)
|
|
{
|
|
ref var partialUnmapLock = ref GetPartialUnmapState().PartialUnmapLock;
|
|
partialUnmapLock.AcquireReaderLock();
|
|
|
|
try
|
|
{
|
|
UnmapViewInternal(sharedMemory, location, size, owner, updateProtection: false);
|
|
MapViewInternal(sharedMemory, srcOffset, location, size, updateProtection: true);
|
|
}
|
|
finally
|
|
{
|
|
partialUnmapLock.ReleaseReaderLock();
|
|
}
|
|
}
|
|
|
|
/// <summary>
|
|
/// Maps a shared memory view on a previously reserved memory region.
|
|
/// </summary>
|
|
/// <param name="sharedMemory">Shared memory that will be the backing storage for the view</param>
|
|
/// <param name="srcOffset">Offset in the shared memory to map</param>
|
|
/// <param name="location">Address to map the view into</param>
|
|
/// <param name="size">Size of the view in bytes</param>
|
|
/// <param name="updateProtection">Indicates if the memory protections should be updated after the map</param>
|
|
/// <exception cref="WindowsApiException">Thrown when the Windows API returns an error mapping the memory</exception>
|
|
private void MapViewInternal(IntPtr sharedMemory, ulong srcOffset, IntPtr location, IntPtr size, bool updateProtection)
|
|
{
|
|
SplitForMap((ulong)location, (ulong)size, srcOffset);
|
|
|
|
var ptr = WindowsApi.MapViewOfFile3(
|
|
sharedMemory,
|
|
WindowsApi.CurrentProcessHandle,
|
|
location,
|
|
srcOffset,
|
|
size,
|
|
0x4000,
|
|
MemoryProtection.ReadWrite,
|
|
IntPtr.Zero,
|
|
0);
|
|
|
|
if (ptr == IntPtr.Zero)
|
|
{
|
|
throw new WindowsApiException("MapViewOfFile3");
|
|
}
|
|
|
|
if (updateProtection)
|
|
{
|
|
UpdateProtection((ulong)location, (ulong)size, MemoryPermission.ReadAndWrite);
|
|
}
|
|
}
|
|
|
|
/// <summary>
|
|
/// Splits a larger placeholder, slicing at the start and end address, for a new memory mapping.
|
|
/// </summary>
|
|
/// <param name="address">Address to split</param>
|
|
/// <param name="size">Size of the new region</param>
|
|
/// <param name="backingOffset">Offset in the shared memory that will be mapped</param>
|
|
private void SplitForMap(ulong address, ulong size, ulong backingOffset)
|
|
{
|
|
ulong endAddress = address + size;
|
|
|
|
var overlaps = new RangeNode<ulong>[InitialOverlapsSize];
|
|
|
|
lock (_mappings)
|
|
{
|
|
int count = _mappings.GetNodes(address, endAddress, ref overlaps);
|
|
|
|
Debug.Assert(count == 1);
|
|
Debug.Assert(!IsMapped(overlaps[0].Value));
|
|
|
|
var overlap = overlaps[0];
|
|
|
|
ulong overlapStart = overlap.Start;
|
|
ulong overlapEnd = overlap.End;
|
|
ulong overlapValue = overlap.Value;
|
|
|
|
_mappings.Remove(overlap);
|
|
|
|
bool overlapStartsBefore = overlapStart < address;
|
|
bool overlapEndsAfter = overlapEnd > endAddress;
|
|
|
|
if (overlapStartsBefore && overlapEndsAfter)
|
|
{
|
|
CheckFreeResult(WindowsApi.VirtualFree(
|
|
(IntPtr)address,
|
|
(IntPtr)size,
|
|
AllocationType.Release | AllocationType.PreservePlaceholder));
|
|
|
|
_mappings.Add(new RangeNode<ulong>(overlapStart, address, overlapValue));
|
|
_mappings.Add(new RangeNode<ulong>(endAddress, overlapEnd, AddBackingOffset(overlapValue, endAddress - overlapStart)));
|
|
}
|
|
else if (overlapStartsBefore)
|
|
{
|
|
ulong overlappedSize = overlapEnd - address;
|
|
|
|
CheckFreeResult(WindowsApi.VirtualFree(
|
|
(IntPtr)address,
|
|
(IntPtr)overlappedSize,
|
|
AllocationType.Release | AllocationType.PreservePlaceholder));
|
|
|
|
_mappings.Add(new RangeNode<ulong>(overlapStart, address, overlapValue));
|
|
}
|
|
else if (overlapEndsAfter)
|
|
{
|
|
ulong overlappedSize = endAddress - overlapStart;
|
|
|
|
CheckFreeResult(WindowsApi.VirtualFree(
|
|
(IntPtr)overlapStart,
|
|
(IntPtr)overlappedSize,
|
|
AllocationType.Release | AllocationType.PreservePlaceholder));
|
|
|
|
_mappings.Add(new RangeNode<ulong>(endAddress, overlapEnd, AddBackingOffset(overlapValue, overlappedSize)));
|
|
}
|
|
|
|
_mappings.Add(new RangeNode<ulong>(address, endAddress, backingOffset));
|
|
}
|
|
}
|
|
|
|
/// <summary>
|
|
/// Unmaps a view that has been previously mapped with <see cref="MapView"/>.
|
|
/// </summary>
|
|
/// <remarks>
|
|
/// For "partial unmaps" (when not the entire mapped range is being unmapped), it might be
|
|
/// necessary to unmap the whole range and then remap the sub-ranges that should remain mapped.
|
|
/// </remarks>
|
|
/// <param name="sharedMemory">Shared memory that the view being unmapped belongs to</param>
|
|
/// <param name="location">Address to unmap</param>
|
|
/// <param name="size">Size of the region to unmap in bytes</param>
|
|
/// <param name="owner">Memory block that owns the mapping</param>
|
|
public void UnmapView(IntPtr sharedMemory, IntPtr location, IntPtr size, MemoryBlock owner)
|
|
{
|
|
ref var partialUnmapLock = ref GetPartialUnmapState().PartialUnmapLock;
|
|
partialUnmapLock.AcquireReaderLock();
|
|
|
|
try
|
|
{
|
|
UnmapViewInternal(sharedMemory, location, size, owner, updateProtection: true);
|
|
}
|
|
finally
|
|
{
|
|
partialUnmapLock.ReleaseReaderLock();
|
|
}
|
|
}
|
|
|
|
/// <summary>
|
|
/// Unmaps a view that has been previously mapped with <see cref="MapView"/>.
|
|
/// </summary>
|
|
/// <remarks>
|
|
/// For "partial unmaps" (when not the entire mapped range is being unmapped), it might be
|
|
/// necessary to unmap the whole range and then remap the sub-ranges that should remain mapped.
|
|
/// </remarks>
|
|
/// <param name="sharedMemory">Shared memory that the view being unmapped belongs to</param>
|
|
/// <param name="location">Address to unmap</param>
|
|
/// <param name="size">Size of the region to unmap in bytes</param>
|
|
/// <param name="owner">Memory block that owns the mapping</param>
|
|
/// <param name="updateProtection">Indicates if the memory protections should be updated after the unmap</param>
|
|
/// <exception cref="WindowsApiException">Thrown when the Windows API returns an error unmapping or remapping the memory</exception>
|
|
private void UnmapViewInternal(IntPtr sharedMemory, IntPtr location, IntPtr size, MemoryBlock owner, bool updateProtection)
|
|
{
|
|
ulong startAddress = (ulong)location;
|
|
ulong unmapSize = (ulong)size;
|
|
ulong endAddress = startAddress + unmapSize;
|
|
|
|
var overlaps = new RangeNode<ulong>[InitialOverlapsSize];
|
|
int count;
|
|
|
|
lock (_mappings)
|
|
{
|
|
count = _mappings.GetNodes(startAddress, endAddress, ref overlaps);
|
|
}
|
|
|
|
for (int index = 0; index < count; index++)
|
|
{
|
|
var overlap = overlaps[index];
|
|
|
|
if (IsMapped(overlap.Value))
|
|
{
|
|
lock (_mappings)
|
|
{
|
|
_mappings.Remove(overlap);
|
|
_mappings.Add(new RangeNode<ulong>(overlap.Start, overlap.End, ulong.MaxValue));
|
|
}
|
|
|
|
bool overlapStartsBefore = overlap.Start < startAddress;
|
|
bool overlapEndsAfter = overlap.End > endAddress;
|
|
|
|
if (overlapStartsBefore || overlapEndsAfter)
|
|
{
|
|
// If the overlap extends beyond the region we are unmapping,
|
|
// then we need to re-map the regions that are supposed to remain mapped.
|
|
// This is necessary because Windows does not support partial view unmaps.
|
|
// That is, you can only fully unmap a view that was previously mapped, you can't just unmap a chunck of it.
|
|
|
|
ref var partialUnmapState = ref GetPartialUnmapState();
|
|
ref var partialUnmapLock = ref partialUnmapState.PartialUnmapLock;
|
|
partialUnmapLock.UpgradeToWriterLock();
|
|
|
|
try
|
|
{
|
|
partialUnmapState.PartialUnmapsCount++;
|
|
|
|
if (!WindowsApi.UnmapViewOfFile2(WindowsApi.CurrentProcessHandle, (IntPtr)overlap.Start, 2))
|
|
{
|
|
throw new WindowsApiException("UnmapViewOfFile2");
|
|
}
|
|
|
|
if (overlapStartsBefore)
|
|
{
|
|
ulong remapSize = startAddress - overlap.Start;
|
|
|
|
MapViewInternal(sharedMemory, overlap.Value, (IntPtr)overlap.Start, (IntPtr)remapSize, updateProtection: false);
|
|
RestoreRangeProtection(overlap.Start, remapSize);
|
|
}
|
|
|
|
if (overlapEndsAfter)
|
|
{
|
|
ulong overlappedSize = endAddress - overlap.Start;
|
|
ulong remapBackingOffset = overlap.Value + overlappedSize;
|
|
ulong remapAddress = overlap.Start + overlappedSize;
|
|
ulong remapSize = overlap.End - endAddress;
|
|
|
|
MapViewInternal(sharedMemory, remapBackingOffset, (IntPtr)remapAddress, (IntPtr)remapSize, updateProtection: false);
|
|
RestoreRangeProtection(remapAddress, remapSize);
|
|
}
|
|
}
|
|
finally
|
|
{
|
|
partialUnmapLock.DowngradeFromWriterLock();
|
|
}
|
|
}
|
|
else if (!WindowsApi.UnmapViewOfFile2(WindowsApi.CurrentProcessHandle, (IntPtr)overlap.Start, 2))
|
|
{
|
|
throw new WindowsApiException("UnmapViewOfFile2");
|
|
}
|
|
}
|
|
}
|
|
|
|
CoalesceForUnmap(startAddress, unmapSize, owner);
|
|
|
|
if (updateProtection)
|
|
{
|
|
UpdateProtection(startAddress, unmapSize, MemoryPermission.None);
|
|
}
|
|
}
|
|
|
|
/// <summary>
|
|
/// Coalesces adjacent placeholders after unmap.
|
|
/// </summary>
|
|
/// <param name="address">Address of the region that was unmapped</param>
|
|
/// <param name="size">Size of the region that was unmapped in bytes</param>
|
|
/// <param name="owner">Memory block that owns the mapping</param>
|
|
private void CoalesceForUnmap(ulong address, ulong size, MemoryBlock owner)
|
|
{
|
|
ulong endAddress = address + size;
|
|
ulong blockAddress = (ulong)owner.Pointer;
|
|
ulong blockEnd = blockAddress + owner.Size;
|
|
int unmappedCount = 0;
|
|
|
|
lock (_mappings)
|
|
{
|
|
RangeNode<ulong> node = _mappings.GetNodeByKey(address);
|
|
|
|
if (node == null)
|
|
{
|
|
// Nothing to coalesce if we have no overlaps.
|
|
return;
|
|
}
|
|
|
|
RangeNode<ulong> predecessor = node.Predecessor;
|
|
RangeNode<ulong> successor = null;
|
|
|
|
for (; node != null; node = successor)
|
|
{
|
|
successor = node.Successor;
|
|
var overlap = node;
|
|
|
|
if (!IsMapped(overlap.Value))
|
|
{
|
|
address = Math.Min(address, overlap.Start);
|
|
endAddress = Math.Max(endAddress, overlap.End);
|
|
|
|
_mappings.Remove(overlap);
|
|
unmappedCount++;
|
|
}
|
|
|
|
if (node.End >= endAddress)
|
|
{
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (predecessor != null && !IsMapped(predecessor.Value) && predecessor.Start >= blockAddress)
|
|
{
|
|
address = Math.Min(address, predecessor.Start);
|
|
|
|
_mappings.Remove(predecessor);
|
|
unmappedCount++;
|
|
}
|
|
|
|
if (successor != null && !IsMapped(successor.Value) && successor.End <= blockEnd)
|
|
{
|
|
endAddress = Math.Max(endAddress, successor.End);
|
|
|
|
_mappings.Remove(successor);
|
|
unmappedCount++;
|
|
}
|
|
|
|
_mappings.Add(new RangeNode<ulong>(address, endAddress, ulong.MaxValue));
|
|
}
|
|
|
|
if (unmappedCount > 1)
|
|
{
|
|
size = endAddress - address;
|
|
|
|
CheckFreeResult(WindowsApi.VirtualFree(
|
|
(IntPtr)address,
|
|
(IntPtr)size,
|
|
AllocationType.Release | AllocationType.CoalescePlaceholders));
|
|
}
|
|
}
|
|
|
|
/// <summary>
|
|
/// Reprotects a region of memory that has been mapped.
|
|
/// </summary>
|
|
/// <param name="address">Address of the region to reprotect</param>
|
|
/// <param name="size">Size of the region to reprotect in bytes</param>
|
|
/// <param name="permission">New permissions</param>
|
|
/// <returns>True if the reprotection was successful, false otherwise</returns>
|
|
public bool ReprotectView(IntPtr address, IntPtr size, MemoryPermission permission)
|
|
{
|
|
ref var partialUnmapLock = ref GetPartialUnmapState().PartialUnmapLock;
|
|
partialUnmapLock.AcquireReaderLock();
|
|
|
|
try
|
|
{
|
|
return ReprotectViewInternal(address, size, permission, false);
|
|
}
|
|
finally
|
|
{
|
|
partialUnmapLock.ReleaseReaderLock();
|
|
}
|
|
}
|
|
|
|
/// <summary>
|
|
/// Reprotects a region of memory that has been mapped.
|
|
/// </summary>
|
|
/// <param name="address">Address of the region to reprotect</param>
|
|
/// <param name="size">Size of the region to reprotect in bytes</param>
|
|
/// <param name="permission">New permissions</param>
|
|
/// <param name="throwOnError">Throw an exception instead of returning an error if the operation fails</param>
|
|
/// <returns>True if the reprotection was successful or if <paramref name="throwOnError"/> is true, false otherwise</returns>
|
|
/// <exception cref="WindowsApiException">If <paramref name="throwOnError"/> is true, it is thrown when the Windows API returns an error reprotecting the memory</exception>
|
|
private bool ReprotectViewInternal(IntPtr address, IntPtr size, MemoryPermission permission, bool throwOnError)
|
|
{
|
|
ulong reprotectAddress = (ulong)address;
|
|
ulong reprotectSize = (ulong)size;
|
|
ulong endAddress = reprotectAddress + reprotectSize;
|
|
|
|
bool success = true;
|
|
|
|
lock (_mappings)
|
|
{
|
|
RangeNode<ulong> node = _mappings.GetNodeByKey(reprotectAddress);
|
|
RangeNode<ulong> successorNode;
|
|
|
|
for (; node != null; node = successorNode)
|
|
{
|
|
successorNode = node.Successor;
|
|
var overlap = node;
|
|
|
|
ulong mappedAddress = overlap.Start;
|
|
ulong mappedSize = overlap.End - overlap.Start;
|
|
|
|
if (mappedAddress < reprotectAddress)
|
|
{
|
|
ulong delta = reprotectAddress - mappedAddress;
|
|
mappedAddress = reprotectAddress;
|
|
mappedSize -= delta;
|
|
}
|
|
|
|
ulong mappedEndAddress = mappedAddress + mappedSize;
|
|
|
|
if (mappedEndAddress > endAddress)
|
|
{
|
|
ulong delta = mappedEndAddress - endAddress;
|
|
mappedSize -= delta;
|
|
}
|
|
|
|
if (!WindowsApi.VirtualProtect((IntPtr)mappedAddress, (IntPtr)mappedSize, WindowsApi.GetProtection(permission), out _))
|
|
{
|
|
if (throwOnError)
|
|
{
|
|
throw new WindowsApiException("VirtualProtect");
|
|
}
|
|
|
|
success = false;
|
|
}
|
|
|
|
if (node.End >= endAddress)
|
|
{
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
UpdateProtection(reprotectAddress, reprotectSize, permission);
|
|
|
|
return success;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Checks the result of a VirtualFree operation, throwing if needed.
|
|
/// </summary>
|
|
/// <param name="success">Operation result</param>
|
|
/// <exception cref="WindowsApiException">Thrown if <paramref name="success"/> is false</exception>
|
|
private static void CheckFreeResult(bool success)
|
|
{
|
|
if (!success)
|
|
{
|
|
throw new WindowsApiException("VirtualFree");
|
|
}
|
|
}
|
|
|
|
/// <summary>
|
|
/// Adds an offset to a backing offset. This will do nothing if the backing offset is the special "unmapped" value.
|
|
/// </summary>
|
|
/// <param name="backingOffset">Backing offset</param>
|
|
/// <param name="offset">Offset to be added</param>
|
|
/// <returns>Added offset or just <paramref name="backingOffset"/> if the region is unmapped</returns>
|
|
private static ulong AddBackingOffset(ulong backingOffset, ulong offset)
|
|
{
|
|
if (backingOffset == ulong.MaxValue)
|
|
{
|
|
return backingOffset;
|
|
}
|
|
|
|
return backingOffset + offset;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Checks if a region is unmapped.
|
|
/// </summary>
|
|
/// <param name="backingOffset">Backing offset to check</param>
|
|
/// <returns>True if the backing offset is the special "unmapped" value, false otherwise</returns>
|
|
private static bool IsMapped(ulong backingOffset)
|
|
{
|
|
return backingOffset != ulong.MaxValue;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Adds a protection to the list of protections.
|
|
/// </summary>
|
|
/// <param name="address">Address of the protected region</param>
|
|
/// <param name="size">Size of the protected region in bytes</param>
|
|
/// <param name="permission">Memory permissions of the region</param>
|
|
private void UpdateProtection(ulong address, ulong size, MemoryPermission permission)
|
|
{
|
|
ulong endAddress = address + size;
|
|
|
|
lock (_protections)
|
|
{
|
|
RangeNode<MemoryPermission> node = _protections.GetNodeByKey(address);
|
|
|
|
if (node != null &&
|
|
node.Start <= address &&
|
|
node.End >= endAddress &&
|
|
node.Value == permission)
|
|
{
|
|
return;
|
|
}
|
|
|
|
RangeNode<MemoryPermission> successorNode;
|
|
|
|
ulong startAddress = address;
|
|
|
|
for (; node != null; node = successorNode)
|
|
{
|
|
successorNode = node.Successor;
|
|
var protection = node;
|
|
|
|
ulong protAddress = protection.Start;
|
|
ulong protEndAddress = protection.End;
|
|
MemoryPermission protPermission = protection.Value;
|
|
|
|
_protections.Remove(protection);
|
|
|
|
if (protPermission == permission)
|
|
{
|
|
if (startAddress > protAddress)
|
|
{
|
|
startAddress = protAddress;
|
|
}
|
|
|
|
if (endAddress < protEndAddress)
|
|
{
|
|
endAddress = protEndAddress;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
if (startAddress > protAddress)
|
|
{
|
|
_protections.Add(new RangeNode<MemoryPermission>(protAddress, startAddress, protPermission));
|
|
}
|
|
|
|
if (endAddress < protEndAddress)
|
|
{
|
|
_protections.Add(new RangeNode<MemoryPermission>(endAddress, protEndAddress, protPermission));
|
|
}
|
|
}
|
|
|
|
if (node.End >= endAddress)
|
|
{
|
|
break;
|
|
}
|
|
}
|
|
|
|
_protections.Add(new RangeNode<MemoryPermission>(startAddress, endAddress, permission));
|
|
}
|
|
}
|
|
|
|
/// <summary>
|
|
/// Removes protection from the list of protections.
|
|
/// </summary>
|
|
/// <param name="address">Address of the protected region</param>
|
|
/// <param name="size">Size of the protected region in bytes</param>
|
|
private void RemoveProtection(ulong address, ulong size)
|
|
{
|
|
ulong endAddress = address + size;
|
|
|
|
lock (_protections)
|
|
{
|
|
RangeNode<MemoryPermission> node = _protections.GetNodeByKey(address);
|
|
RangeNode<MemoryPermission> successorNode;
|
|
|
|
for (; node != null; node = successorNode)
|
|
{
|
|
successorNode = node.Successor;
|
|
var protection = node;
|
|
|
|
ulong protAddress = protection.Start;
|
|
ulong protEndAddress = protection.End;
|
|
MemoryPermission protPermission = protection.Value;
|
|
|
|
_protections.Remove(protection);
|
|
|
|
if (address > protAddress)
|
|
{
|
|
_protections.Add(new RangeNode<MemoryPermission>(protAddress, address, protPermission));
|
|
}
|
|
|
|
if (endAddress < protEndAddress)
|
|
{
|
|
_protections.Add(new RangeNode<MemoryPermission>(endAddress, protEndAddress, protPermission));
|
|
}
|
|
|
|
if (node.End >= endAddress)
|
|
{
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/// <summary>
|
|
/// Restores the protection of a given memory region that was remapped, using the protections list.
|
|
/// </summary>
|
|
/// <param name="address">Address of the remapped region</param>
|
|
/// <param name="size">Size of the remapped region in bytes</param>
|
|
private void RestoreRangeProtection(ulong address, ulong size)
|
|
{
|
|
ulong endAddress = address + size;
|
|
var overlaps = new RangeNode<MemoryPermission>[InitialOverlapsSize];
|
|
int count;
|
|
|
|
lock (_protections)
|
|
{
|
|
count = _protections.GetNodes(address, endAddress, ref overlaps);
|
|
}
|
|
|
|
ulong startAddress = address;
|
|
|
|
for (int index = 0; index < count; index++)
|
|
{
|
|
var protection = overlaps[index];
|
|
|
|
// If protection is R/W we don't need to reprotect as views are initially mapped as R/W.
|
|
if (protection.Value == MemoryPermission.ReadAndWrite)
|
|
{
|
|
continue;
|
|
}
|
|
|
|
ulong protAddress = protection.Start;
|
|
ulong protEndAddress = protection.End;
|
|
|
|
if (protAddress < address)
|
|
{
|
|
protAddress = address;
|
|
}
|
|
|
|
if (protEndAddress > endAddress)
|
|
{
|
|
protEndAddress = endAddress;
|
|
}
|
|
|
|
ReprotectViewInternal((IntPtr)protAddress, (IntPtr)(protEndAddress - protAddress), protection.Value, true);
|
|
}
|
|
}
|
|
}
|
|
} |