/// <summary>set r/w/x protection on a portion of memory. rounded to encompassing pages</summary
/// <exception cref="InvalidOperationException">failed to protect memory</exception>
public void Protect(ulong start, ulong length, Protection prot)
{
EnsureActive();
if (length == 0)
{
return;
}
if (_sealed)
{
_pal.GetWriteStatus(_dirtydata, _pageData);
}
// Note: asking for prot.none on memory that was not previously committed, commits it
var computedStart = WaterboxUtils.AlignDown(start);
var computedEnd = WaterboxUtils.AlignUp(start + length);
var computedLength = computedEnd - computedStart;
// potentially commit more memory
var minNewCommittedSize = computedEnd - Start;
if (minNewCommittedSize > CommittedSize)
{
CommittedSize = minNewCommittedSize;
// Since Commit() was called, we have to do a full ProtectAll -- remember that when refactoring
_pal.Commit(CommittedSize);
}
int pstart = GetPage(start);
int pend = GetPage(start + length - 1);
for (int i = pstart; i <= pend; i++)
{
_pageData[i] = prot;
// inform the low level code what addresses might fault on it
if (prot == Protection.RW || prot == Protection.RW_Stack)
{
_dirtydata[i] |= WriteDetectionStatus.CanChange;
}
else
{
_dirtydata[i] &= ~WriteDetectionStatus.CanChange;
}
}
// TODO: restore the previous behavior where we would only reprotect a partial range
ProtectAll();
if (_sealed)
{
_pal.SetWriteStatus(_dirtydata);
}
}
/// <summary>activate the memory block, swapping it in at the pre-specified address</summary>
/// <exception cref="InvalidOperationException"><see cref="MemoryBlock.Active"/> is <see langword="true"/> or failed to map file view</exception>
public void Activate()
{
if (Active)
{
throw new InvalidOperationException("Already active");
}
_pal.Activate();
if (CommittedSize > LastActiveCommittedSize)
{
_pal.Commit(CommittedSize);
LastActiveCommittedSize = CommittedSize;
}
ProtectAll();
Active = true;
}
/// <summary>set r/w/x protection on a portion of memory. rounded to encompassing pages</summary>
/// <exception cref="InvalidOperationException">failed to protect memory</exception>
public void Protect(ulong start, ulong length, Protection prot)
{
EnsureActive();
if (length == 0)
{
return;
}
// Note: asking for prot.none on memory that was not previously committed, commits it
var computedStart = WaterboxUtils.AlignDown(start);
var computedEnd = WaterboxUtils.AlignUp(start + length);
var computedLength = computedEnd - computedStart;
// potentially commit more memory
var minNewCommittedSize = computedEnd - Start;
if (minNewCommittedSize > CommittedSize)
{
CommittedSize = minNewCommittedSize;
// Since Commit() was called, we have to do a full ProtectAll -- remember that when refactoring
_pal.Commit(CommittedSize);
}
int pstart = GetPage(start);
int pend = GetPage(start + length - 1);
for (int i = pstart; i <= pend; i++)
{
_pageData[i] = prot;
}
// TODO: restore the previous behavior where we would only reprotect a partial range
ProtectAll();
}
