/// <summary>
/// See base class documentation.
/// </summary>
/// <param name="anILOpInfo">See base class documentation.</param>
/// <param name="aScannerState">See base class documentation.</param>
/// <returns>See base class documentation.</returns>
public override string Convert(ILOpInfo anILOpInfo, ILScannerState aScannerState)
{
StringBuilder result = new StringBuilder();
//Push the previous method's ebp
result.AppendLine("push dword ebp");
//Set ebp for this method
//See calling convention spec - this allows easy access of
//args and locals within the method without having to track
//temporary values (which would be a nightmare with the
//exception handling implmentation that the kernel uses!)
result.AppendLine("mov dword ebp, esp");
//Allocate stack space for locals
//Only bother if there are any locals
if (aScannerState.CurrentILChunk.LocalVariables.Count > 0)
{
int totalBytes = 0;
foreach (StackItem aLocal in aScannerState.CurrentILChunk.LocalVariables)
{
totalBytes += aLocal.sizeOnStackInBytes;
}
//We do not use "sub esp, X" (see below) because that leaves
//junk memory - we need memory to be "initialised" to 0
//so that local variables are null unless properly initialised.
//This prevents errors in the GC.
for (int i = 0; i < totalBytes / 4; i++)
{
result.AppendLine("push dword 0");
}
//result.AppendLine(string.Format("sub esp, {0}", totalBytes));
}
return result.ToString().Trim();
}
/// <summary>
/// See base class documentation.
/// </summary>
/// <param name="anILOpInfo">See base class documentation.</param>
/// <param name="aScannerState">See base class documentation.</param>
/// <returns>See base class documentation.</returns>
public override string Convert(ILOpInfo anILOpInfo, ILScannerState aScannerState)
{
StringBuilder result = new StringBuilder();
//Get the ID (i.e. ASM label) of the method to load a pointer to
string methodID = aScannerState.GetMethodID(anILOpInfo.MethodToCall);
//If we want to load the pointer at a specified IL op number:
if(anILOpInfo.LoadAtILOffset != int.MaxValue)
{
//Append the IL sub-label to the ID
methodID += ".IL_" + anILOpInfo.LoadAtILOffset + "_0";
//Note: This is used by try/catch/finally blocks for pushing pointers
// to catch/finally handlers and filters
}
//Push the pointer to the function
result.AppendLine(string.Format("push dword {0}", methodID));
aScannerState.CurrentStackFrame.Stack.Push(new StackItem()
{
isFloat = false,
sizeOnStackInBytes = 4,
isGCManaged = false
});
return result.ToString().Trim();
}
/// <summary>
/// See base class documentation.
/// </summary>
/// <param name="anILOpInfo">See base class documentation.</param>
/// <param name="aScannerState">See base class documentation.</param>
/// <returns>See base class documentation.</returns>
/// <exception cref="System.NotSupportedException">
/// Thrown if either or both values to shift left are floating point values or
/// if the values are 8 bytes in size.
/// </exception>
/// <exception cref="System.InvalidOperationException">
/// Thrown if either or both values to multiply are not 4 or 8 bytes
/// in size or if the values are of different size.
/// </exception>
public override string Convert(ILOpInfo anILOpInfo, ILScannerState aScannerState)
{
StringBuilder result = new StringBuilder();
StackItem theItem = aScannerState.CurrentStackFrame.Stack.Peek();
if (theItem.isFloat)
{
//SUPPORT - Not op for floats
throw new NotSupportedException("Not op not supported for float operands!");
}
if (theItem.sizeOnStackInBytes == 4)
{
result.AppendLine("pop dword eax");
result.AppendLine("not eax");
result.AppendLine("push dword eax");
}
else if (theItem.sizeOnStackInBytes == 8)
{
result.AppendLine("pop dword eax");
result.AppendLine("pop dword ebx");
result.AppendLine("not eax");
result.AppendLine("not ebx");
result.AppendLine("push dword ebx");
result.AppendLine("push dword eax");
}
else
{
throw new NotSupportedException("Not op not supported for operand size!");
}
return result.ToString().Trim();
}
/// <summary>
/// See base class documentation.
/// </summary>
/// <param name="anILOpInfo">See base class documentation.</param>
/// <param name="aScannerState">See base class documentation.</param>
/// <returns>See base class documentation.</returns>
/// <exception cref="System.NotSupportedException">
/// Thrown if divide operands are floating point numbers or if attempting to divide 64-bit numbers.
/// </exception>
/// <exception cref="System.InvalidOperationException">
/// Thrown if either operand is < 4 bytes long.
/// </exception>
public override string Convert(ILOpInfo anILOpInfo, ILScannerState aScannerState)
{
StringBuilder result = new StringBuilder();
StackItem testItem = aScannerState.CurrentStackFrame.Stack.Pop();
if (testItem.isFloat)
{
//TODO - Support floats
throw new NotSupportedException("Switch for floats no supported!");
}
else if (testItem.sizeOnStackInBytes != 4)
{
//TODO - Support other sizes
throw new NotSupportedException("Switch for non-int32s not supported!");
}
result.AppendLine("pop dword eax");
for (int i = 0; i < anILOpInfo.ValueBytes.Length / 4; i++)
{
int branchPos = anILOpInfo.Position + 4 + Utils.ReadInt32(anILOpInfo.ValueBytes, i * 4);
branchPos += anILOpInfo.ValueBytes.Length;
branchPos += 1;
result.AppendLine("cmp eax, " + i);
string jumpToLabel = string.Format("{0}.IL_{1}_0",
aScannerState.GetMethodID(aScannerState.CurrentILChunk.Method),
branchPos);
result.AppendLine("je " + jumpToLabel);
}
return result.ToString().Trim();
}
/// <summary>
/// See base class documentation.
/// </summary>
/// <param name="anILOpInfo">See base class documentation.</param>
/// <param name="aScannerState">See base class documentation.</param>
/// <returns>See base class documentation.</returns>
public override string Convert(ILOpInfo anILOpInfo, ILScannerState aScannerState)
{
StringBuilder result = new StringBuilder();
//Load a string literal (- fixed string i.e. one programmed as "a string in code")
//Get the string metadata token used to get the string from the assembly
int StringMetadataToken = Utils.ReadInt32(anILOpInfo.ValueBytes, 0);
//Get the value of the string to load
string theString = aScannerState.CurrentILChunk.Method.Module.ResolveString(StringMetadataToken);
//Add the string literal and get its ID
string theStringID = aScannerState.AddStringLiteral(theString, anILOpInfo);
//Push the address of the string (i.e. address of ID - ASM label)
result.AppendLine(string.Format("push {0}", theStringID));
aScannerState.CurrentStackFrame.Stack.Push(new StackItem()
{
sizeOnStackInBytes = 4,
isFloat = false,
isGCManaged = true
});
return result.ToString().Trim();
}
/// <summary>
/// See base class documentation.
/// </summary>
/// <param name="anILOpInfo">See base class documentation.</param>
/// <param name="aScannerState">See base class documentation.</param>
/// <returns>See base class documentation.</returns>
public override string Convert(ILOpInfo anILOpInfo, ILScannerState aScannerState)
{
StringBuilder result = new StringBuilder();
int dwordsToRotate = anILOpInfo.ValueBytes == null ? 2 : BitConverter.ToInt32(anILOpInfo.ValueBytes, 0);
int bytesShift = 0;
for (int i = 0; i < dwordsToRotate; i++)
{
if (i == 0)
{
GlobalMethods.InsertPageFaultDetection(result, aScannerState, "esp", bytesShift, OpCodes.Unbox);
result.AppendLine(string.Format("mov eax, [esp+{0}]", bytesShift));
GlobalMethods.InsertPageFaultDetection(result, aScannerState, "esp", bytesShift + 4, OpCodes.Unbox);
result.AppendLine(string.Format("mov dword ebx, [esp+{0}]", bytesShift + 4));
GlobalMethods.InsertPageFaultDetection(result, aScannerState, "esp", bytesShift, OpCodes.Unbox);
result.AppendLine(string.Format("mov dword [esp+{0}], ebx", bytesShift));
}
else if (i == dwordsToRotate - 1)
{
GlobalMethods.InsertPageFaultDetection(result, aScannerState, "esp", bytesShift, OpCodes.Unbox);
result.AppendLine(string.Format("mov [esp+{0}], eax", bytesShift));
}
else
{
GlobalMethods.InsertPageFaultDetection(result, aScannerState, "esp", bytesShift + 4, OpCodes.Unbox);
result.AppendLine(string.Format("mov dword ebx, [esp+{0}]", bytesShift + 4));
GlobalMethods.InsertPageFaultDetection(result, aScannerState, "esp", bytesShift, OpCodes.Unbox);
result.AppendLine(string.Format("mov dword [esp+{0}], ebx", bytesShift));
}
bytesShift += 4;
}
return result.ToString().Trim();
}
/// <summary>
/// See base class documentation.
/// </summary>
/// <param name="anILOpInfo">See base class documentation.</param>
/// <param name="aScannerState">See base class documentation.</param>
/// <returns>See base class documentation.</returns>
public override string Convert(ILOpInfo anILOpInfo, ILScannerState aScannerState)
{
StringBuilder result = new StringBuilder();
result.AppendLine("ret");
return result.ToString().Trim();
}
/// <summary>
/// See base class documentation.
/// </summary>
/// <param name="anILOpInfo">See base class documentation.</param>
/// <param name="aScannerState">See base class documentation.</param>
/// <returns>See base class documentation.</returns>
public override string Convert(ILOpInfo anILOpInfo, ILScannerState aScannerState)
{
if (anILOpInfo.IsDebugOp)
{
return "int3";
}
else
{
return "nop";
}
}
/// <summary>
/// See base class documentation.
/// </summary>
/// <param name="anILOpInfo">See base class documentation.</param>
/// <param name="aScannerState">See base class documentation.</param>
/// <returns>See base class documentation.</returns>
/// <exception cref="System.NotSupportedException">
/// Thrown if field to load is a floating value or the field to load
/// is not of size 4 or 8 bytes.
/// </exception>
public override string Convert(ILOpInfo anILOpInfo, ILScannerState aScannerState)
{
StringBuilder result = new StringBuilder();
aScannerState.CurrentStackFrame.Stack.Pop();
DB_Type arrayDBType = DebugDatabase.GetType(aScannerState.GetTypeID(aScannerState.ArrayClass));
int lengthOffset = aScannerState.GetFieldOffset(arrayDBType, "length");
// 1. Check array reference is not null
// 1.1. Move array ref into eax
// 1.2. Compare eax (array ref) to 0
// 1.3. If not zero, jump to continue execution further down
// 1.4. Otherwise, call Exceptions.ThrowNullReferenceException
// 2. Load array length
string ContinueExecutionLabelBase = string.Format("{0}.IL_{1}_ContinueExecution",
aScannerState.GetMethodID(aScannerState.CurrentILChunk.Method),
anILOpInfo.Position);
string ContinueExecutionLabel1 = ContinueExecutionLabelBase + "1";
// 1.1. Move array ref into eax
GlobalMethods.InsertPageFaultDetection(result, aScannerState, "esp", 0, (OpCodes)anILOpInfo.opCode.Value);
result.AppendLine("mov eax, [esp]");
// 1.2. Compare eax (array ref) to 0
result.AppendLine("cmp eax, 0");
// 1.3. If not zero, jump to continue execution further down
result.AppendLine("jnz " + ContinueExecutionLabel1);
// 1.4. Otherwise, call Exceptions.ThrowNullReferenceException
result.AppendLine(string.Format("call {0}", aScannerState.GetMethodID(aScannerState.ThrowNullReferenceExceptionMethod)));
result.AppendLine(ContinueExecutionLabel1 + ":");
//2. Load array length
// - Pop array ref
result.AppendLine("pop dword ecx");
// - Load length from array ref
GlobalMethods.InsertPageFaultDetection(result, aScannerState, "ecx", lengthOffset, (OpCodes)anILOpInfo.opCode.Value);
result.AppendLine(string.Format("mov eax, [ecx+{0}]", lengthOffset));
// - Push array length
result.AppendLine("push dword eax");
aScannerState.CurrentStackFrame.Stack.Push(new StackItem()
{
isFloat = false,
sizeOnStackInBytes = 4,
isGCManaged = false
});
return result.ToString().Trim();
}
/// <summary>
/// See base class documentation.
/// </summary>
/// <param name="anILOpInfo">See base class documentation.</param>
/// <param name="aScannerState">See base class documentation.</param>
/// <returns>See base class documentation.</returns>
public override string Convert(ILOpInfo anILOpInfo, ILScannerState aScannerState)
{
StringBuilder result = new StringBuilder();
//Load null (i.e. 0 as dword)
aScannerState.CurrentStackFrame.Stack.Push(new StackItem()
{
isFloat = false,
sizeOnStackInBytes = 4,
isGCManaged = false
});
result.AppendLine("push dword 0");
return result.ToString().Trim();
}
public override string Convert(ILOpInfo anILOpInfo, ILScannerState aScannerState)
{
StringBuilder result = new StringBuilder();
result.AppendLine("; Method End"); //DEBUG INFO
result.AppendLine("pop rbp");
result.AppendLine("mov rsp, rbp");
StackFrame currFrame = aScannerState.StackFrames.Peek();
currFrame.Stack.Pop();
result.AppendLine("ret");
return result.ToString().Trim();
}
/// <summary>
/// See base class documentation.
/// </summary>
/// <param name="anILOpInfo">See base class documentation.</param>
/// <param name="aScannerState">See base class documentation.</param>
/// <returns>See base class documentation.</returns>
/// <exception cref="System.NotSupportedException">
/// If either value is < 4 bytes in length or
/// operands are not of the same size.
/// </exception>
public override string Convert(ILOpInfo anILOpInfo, ILScannerState aScannerState)
{
StringBuilder result = new StringBuilder();
//Pop item to duplicate
StackItem itemA = aScannerState.CurrentStackFrame.Stack.Pop();
if(itemA.isFloat)
{
//SUPPORT - floats
throw new NotSupportedException("Duplicate float vals not suppported yet!");
}
if(itemA.sizeOnStackInBytes == 4)
{
result.AppendLine("pop dword eax");
result.AppendLine("push dword eax");
result.AppendLine("push dword eax");
}
else if (itemA.sizeOnStackInBytes == 8)
{
result.AppendLine("pop dword eax");
result.AppendLine("pop dword edx");
result.AppendLine("push dword edx");
result.AppendLine("push dword eax");
result.AppendLine("push dword edx");
result.AppendLine("push dword eax");
}
else
{
throw new NotSupportedException("Stack item size not supported by duplicate op!");
}
aScannerState.CurrentStackFrame.Stack.Push(new StackItem()
{
isFloat = itemA.isFloat,
sizeOnStackInBytes = itemA.sizeOnStackInBytes,
isGCManaged = itemA.isGCManaged
});
aScannerState.CurrentStackFrame.Stack.Push(new StackItem()
{
isFloat = itemA.isFloat,
sizeOnStackInBytes = itemA.sizeOnStackInBytes,
isGCManaged = itemA.isGCManaged
});
return result.ToString().Trim();
}
public override string Convert(ILOpInfo anILOpInfo, ILScannerState aScannerState)
{
StringBuilder result = new StringBuilder();
result.AppendLine("; Method Start"); //DEBUG INFO
result.AppendLine("push rbp");
result.AppendLine("mov rbp, rsp");
StackFrame currFrame = aScannerState.StackFrames.Peek();
currFrame.Stack.Push(new StackItem()
{
sizeOnStackInBytes = 8
});
return result.ToString().Trim();
}
/// <summary>
/// See base class documentation.
/// </summary>
/// <param name="anILOpInfo">See base class documentation.</param>
/// <param name="aScannerState">See base class documentation.</param>
/// <returns>See base class documentation.</returns>
/// <exception cref="System.NotSupportedException">
/// Thrown if the value to store is floating point or
/// if the value is not 4 or 8 bytes in size.
/// </exception>
public override string Convert(ILOpInfo anILOpInfo, ILScannerState aScannerState)
{
StringBuilder result = new StringBuilder();
int metadataToken = Utils.ReadInt32(anILOpInfo.ValueBytes, 0);
FieldInfo theField = aScannerState.CurrentILChunk.Method.Module.ResolveField(metadataToken);
DB_Type objDBType = DebugDatabase.GetType(aScannerState.GetTypeID(theField.DeclaringType));
int offset = aScannerState.GetFieldOffset(objDBType, theField.Name);
int stackSize = Utils.GetNumBytesForType(theField.FieldType);
int memSize = theField.FieldType.IsValueType ? Utils.GetSizeForType(theField.FieldType) : stackSize;
StackItem value = aScannerState.CurrentStackFrame.Stack.Pop();
StackItem objPointer = aScannerState.CurrentStackFrame.Stack.Pop();
if (value.isFloat)
{
//SUPPORT - floats
throw new NotSupportedException("Storing fields of type float not supported yet!");
}
//Get object pointer
GlobalMethods.InsertPageFaultDetection(result, aScannerState, "esp", stackSize, (OpCodes)anILOpInfo.opCode.Value);
result.AppendLine(string.Format("mov ecx, [esp+{0}]", stackSize));
//Pop and mov value
for (int i = 0; i < memSize; i += 2)
{
if (memSize - i == 1)
{
result.AppendLine("pop word ax");
GlobalMethods.InsertPageFaultDetection(result, aScannerState, "ecx", offset + i, (OpCodes)anILOpInfo.opCode.Value);
result.AppendLine(string.Format("mov byte [ecx+{0}], al", offset + i));
}
else
{
result.AppendLine("pop word ax");
GlobalMethods.InsertPageFaultDetection(result, aScannerState, "ecx", offset + i, (OpCodes)anILOpInfo.opCode.Value);
result.AppendLine(string.Format("mov word [ecx+{0}], ax", offset + i));
}
}
result.AppendLine(string.Format("add esp, {0}", ((stackSize - memSize) / 2) * 2)); //Rounds down
result.AppendLine("add esp, 4");//Pop object pointer
return result.ToString().Trim();
}
/// <summary>
/// See base class documentation.
/// </summary>
/// <param name="anILOpInfo">See base class documentation.</param>
/// <param name="aScannerState">See base class documentation.</param>
/// <returns>See base class documentation.</returns>
public override string Convert(ILOpInfo anILOpInfo, ILScannerState aScannerState)
{
StringBuilder result = new StringBuilder();
int metadataToken = Utils.ReadInt32(anILOpInfo.ValueBytes, 0);
Type theType = aScannerState.CurrentILChunk.Method.Module.ResolveType(metadataToken);
result.AppendLine(string.Format("push dword {0}", Utils.GetNumBytesForType(theType)));
aScannerState.CurrentStackFrame.Stack.Push(new StackItem()
{
isFloat = false,
sizeOnStackInBytes = 4,
isGCManaged = false
});
return result.ToString().Trim();
}
/// <summary>
/// See base class documentation.
/// </summary>
/// <param name="anILOpInfo">See base class documentation.</param>
/// <param name="aScannerState">See base class documentation.</param>
/// <returns>See base class documentation.</returns>
/// <exception cref="System.NotSupportedException">
/// Thrown if the value to store is floating point.
/// </exception>
public override string Convert(ILOpInfo anILOpInfo, ILScannerState aScannerState)
{
StringBuilder result = new StringBuilder();
int metadataToken = Utils.ReadInt32(anILOpInfo.ValueBytes, 0);
FieldInfo theField = aScannerState.CurrentILChunk.Method.Module.ResolveField(metadataToken);
string fieldID = aScannerState.GetStaticFieldID(theField);
int size = Utils.GetNumBytesForType(theField.FieldType);
bool isFloat = Utils.IsFloat(theField.FieldType);
StackItem value = aScannerState.CurrentStackFrame.Stack.Pop();
if (isFloat)
{
//SUPPORT - floats
throw new NotSupportedException("Storing static fields of type float not supported yet!");
}
if (size == 1)
{
result.AppendLine("pop dword eax");
result.AppendLine(string.Format("mov byte [{0}], al", fieldID));
}
else if (size == 2)
{
result.AppendLine("pop dword eax");
result.AppendLine(string.Format("mov word [{0}], ax", fieldID));
}
else if (size == 4)
{
result.AppendLine("pop dword eax");
result.AppendLine(string.Format("mov dword [{0}], eax", fieldID));
}
else if (size == 8)
{
result.AppendLine("pop dword eax");
result.AppendLine(string.Format("mov byte [{0}], eax", fieldID));
result.AppendLine("pop dword eax");
result.AppendLine(string.Format("mov byte [{0}+4], eax", fieldID));
}
return result.ToString().Trim();
}
/// <summary>
/// See base class documentation.
/// </summary>
/// <param name="anILOpInfo">See base class documentation.</param>
/// <param name="aScannerState">See base class documentation.</param>
/// <returns>See base class documentation.</returns>
public override string Convert(ILOpInfo anILOpInfo, ILScannerState aScannerState)
{
StringBuilder result = new StringBuilder();
StackItem theItem = aScannerState.CurrentStackFrame.Stack.Pop();
if (theItem.isNewGCObject)
{
//Decrement ref count
//Get the ID of method to call as it will be labelled in the output ASM.
string methodID = aScannerState.GetMethodID(aScannerState.DecrementRefCountMethod);
//Append the actual call
result.AppendLine(string.Format("call {0}", methodID));
}
result.AppendLine(string.Format("add esp, {0}", theItem.sizeOnStackInBytes));
return result.ToString().Trim();
}
/// <summary>
/// See base class documentation.
/// </summary>
/// <param name="anILOpInfo">See base class documentation.</param>
/// <param name="aScannerState">See base class documentation.</param>
/// <returns>See base class documentation.</returns>
/// <exception cref="System.NotSupportedException">
/// Thrown when loading a static float field.
/// </exception>
public override string Convert(ILOpInfo anILOpInfo, ILScannerState aScannerState)
{
StringBuilder result = new StringBuilder();
//Load static field
//Load the metadata token used to get the type info
int metadataToken = Utils.ReadInt32(anILOpInfo.ValueBytes, 0);
//Get the type info for the object to load
Type theType = aScannerState.CurrentILChunk.Method.Module.ResolveType(metadataToken);
//Get the object size information
int size = Utils.GetNumBytesForType(theType);
//Load the object onto the stack
result.AppendLine("pop dword ecx");
for (int i = size - 4; i >= 0; i -= 4)
{
GlobalMethods.InsertPageFaultDetection(result, aScannerState, "ecx", i, (OpCodes)anILOpInfo.opCode.Value);
result.AppendLine(string.Format("mov dword eax, [ecx+{0}]", i));
result.AppendLine("push dword eax");
}
int extra = size % 4;
for (int i = extra - 1; i >= 0; i--)
{
GlobalMethods.InsertPageFaultDetection(result, aScannerState, "ecx", i, (OpCodes)anILOpInfo.opCode.Value);
result.AppendLine(string.Format("mov byte al, [ecx+{0}]", i));
result.AppendLine("push byte al");
}
aScannerState.CurrentStackFrame.Stack.Push(new StackItem()
{
isFloat = false,
sizeOnStackInBytes = size,
isGCManaged = false
});
return result.ToString().Trim();
}
public override string Convert(ILOpInfo anILOpInfo, ILScannerState aScannerState)
{
StringBuilder result = new StringBuilder();
//Just removes (pops) the top value off our stack
//But we must check that our "top value on stack" is actually on the stack and not in a register
StackFrame currFrame = aScannerState.StackFrames.Peek();
//We assume there is an item on the stack. If there isn't, we have gotten out of sync with the IL.
//If debugging this, you should assume that the IL code is correct and our compiler is wrong.
//Microsoft are much more likely to be correct than we are ;)
StackItem topItem = currFrame.Stack.Pop();
if (topItem.register == null)
{
result.AppendLine("pop");
}
else
{
result.AppendLine(string.Format("; top-most stack item in register '{0}'", topItem.register)); //DEBUG INFO
}
return result.ToString().Trim();
}
/// <summary>
/// See base class documentation.
/// </summary>
/// <param name="anILOpInfo">See base class documentation.</param>
/// <param name="aScannerState">See base class documentation.</param>
/// <returns>See base class documentation.</returns>
/// <exception cref="System.NotSupportedException">
/// Thrown if either or both values to 'or' are floating point values.
/// </exception>
/// <exception cref="System.InvalidOperationException">
/// Thrown if either or both values to multiply are not 4 or 8 bytes
/// in size or if the values are of different size.
/// </exception>
public override string Convert(ILOpInfo anILOpInfo, ILScannerState aScannerState)
{
StringBuilder result = new StringBuilder();
//Pop in reverse order to push
StackItem itemB = aScannerState.CurrentStackFrame.Stack.Pop();
StackItem itemA = aScannerState.CurrentStackFrame.Stack.Pop();
if (itemB.sizeOnStackInBytes < 4 ||
itemA.sizeOnStackInBytes < 4)
{
throw new InvalidOperationException("Invalid stack operand sizes!");
}
else if (itemB.isFloat || itemA.isFloat)
{
//SUPPORT - floats
throw new NotSupportedException("Add floats is unsupported!");
}
else
{
if (itemA.sizeOnStackInBytes == 4 &&
itemB.sizeOnStackInBytes == 4)
{
//Pop item B
result.AppendLine("pop dword ebx");
//Pop item A
result.AppendLine("pop dword eax");
result.AppendLine("and eax, ebx");
result.AppendLine("push dword eax");
aScannerState.CurrentStackFrame.Stack.Push(new StackItem()
{
isFloat = false,
sizeOnStackInBytes = 4,
isGCManaged = false
});
}
else if ((itemA.sizeOnStackInBytes == 8 &&
itemB.sizeOnStackInBytes == 4) ||
(itemA.sizeOnStackInBytes == 4 &&
itemB.sizeOnStackInBytes == 8))
{
throw new InvalidOperationException("Invalid stack operand sizes! They should be the same size.");
}
else if (itemA.sizeOnStackInBytes == 8 &&
itemB.sizeOnStackInBytes == 8)
{
//Pop item B to ecx:ebx
result.AppendLine("pop dword ebx");
result.AppendLine("pop dword ecx");
//Pop item A to edx:eax
result.AppendLine("pop dword eax");
result.AppendLine("pop dword edx");
//And ecx:ebx with edx:eax
result.AppendLine("and eax, ebx");
result.AppendLine("and edx, ecx");
result.AppendLine("push dword edx");
result.AppendLine("push dword eax");
aScannerState.CurrentStackFrame.Stack.Push(new StackItem()
{
isFloat = false,
sizeOnStackInBytes = 8,
isGCManaged = false
});
}
}
return result.ToString().Trim();
}
/// <summary>
/// See base class documentation.
/// </summary>
/// <param name="anILOpInfo">See base class documentation.</param>
/// <param name="aScannerState">See base class documentation.</param>
/// <returns>See base class documentation.</returns>
/// <exception cref="System.NotSupportedException">
/// Thrown if any argument or the return value is a floating point number.
/// </exception>
public override string Convert(ILOpInfo anILOpInfo, ILScannerState aScannerState)
{
StringBuilder result = new StringBuilder();
MethodBase methodToCall = anILOpInfo.MethodToCall;
//The method to call is a method base
//A method base can be either a method info i.e. a normal method
//or a constructor method. The two types are treated separately.
if(methodToCall is MethodInfo)
{
//Need to do callvirt related stuff to load address of method to call
// - Check for invoke of a delegate - if so, treat rather differently from normal callvirt
string call_Label = string.Format("{0}.IL_{1}_Call",
aScannerState.GetMethodID(aScannerState.CurrentILChunk.Method),
anILOpInfo.Position);
if (typeof(Delegate).IsAssignableFrom(((MethodInfo)methodToCall).DeclaringType))
{
//Callvirt to delegate method
// - We only support calls to Invoke at the moment
if (methodToCall.Name != "Invoke")
{
throw new NotSupportedException("Callvirt to Delegate method not supported! Method name: " + methodToCall.Name);
}
int bytesForAllParams = ((MethodInfo)methodToCall).GetParameters().Select(x => Utils.GetNumBytesForType(x.ParameterType)).Sum();
// - Move into eax address of function to call from stack - delegate reference is function pointer
//All the parameters for the method that was called
List<Type> allParams = ((MethodInfo)methodToCall).GetParameters().Select(x => x.ParameterType).ToList();
int bytesForParams = allParams.Select(x => Utils.GetNumBytesForType(x)).Sum();
GlobalMethods.InsertPageFaultDetection(result, aScannerState, "esp", bytesForParams, (OpCodes)anILOpInfo.opCode.Value);
result.AppendLine(string.Format("mov dword eax, [esp+{0}]", bytesForParams));
//Allocate space on the stack for the return value as necessary
Type retType = ((MethodInfo)methodToCall).ReturnType;
StackItem returnItem = new StackItem()
{
isFloat = Utils.IsFloat(retType),
sizeOnStackInBytes = Utils.GetNumBytesForType(retType),
isGCManaged = Utils.IsGCManaged(retType)
};
//We do not push the return value onto the stack unless it has size > 0
//We do not push the return value onto our stack at this point - it is pushed after the call is done
if (returnItem.sizeOnStackInBytes != 0)
{
if (returnItem.isFloat)
{
//SUPPORT - floats
throw new NotSupportedException("Cannot handle float return values!");
}
else if (returnItem.sizeOnStackInBytes == 4)
{
result.AppendLine("push dword 0");
}
else if (returnItem.sizeOnStackInBytes == 8)
{
result.AppendLine("push dword 0");
result.AppendLine("push dword 0");
}
else
{
throw new NotSupportedException("Invalid return stack operand size!");
}
}
//Append the actual call
result.AppendLine("call eax");
//After a call, we need to remove the return value and parameters from the stack
//This is most easily done by just adding the total number of bytes for params and
//return value to the stack pointer (ESP register).
//Stores the number of bytes to add
// - Initially at least 4 for the delegate (method) ref/pointer
int bytesToAdd = 4;
//Go through all params that must be removed
foreach (Type aParam in allParams)
{
//Pop the paramter off our stack
//(Note: Return value was never pushed onto our stack. See above)
aScannerState.CurrentStackFrame.Stack.Pop();
//Add the size of the paramter to the total number of bytes to pop
bytesToAdd += Utils.GetNumBytesForType(aParam);
}
//If there is a return value on the stack
if (returnItem.sizeOnStackInBytes != 0)
{
//We need to store the return value then pop all the params
//We now push the return value onto our stack as,
//after all is said and done below, it will be the
//top item on the stack
aScannerState.CurrentStackFrame.Stack.Push(returnItem);
//SUPPORT - floats (with above)
//Pop the return value into the eax register
//We will push it back on after params are skipped over.
if (returnItem.sizeOnStackInBytes == 4)
{
result.AppendLine("pop dword eax");
}
else if (returnItem.sizeOnStackInBytes == 8)
{
result.AppendLine("pop dword eax");
result.AppendLine("pop dword edx");
}
}
//Skip over the params
result.AppendLine(string.Format("add esp, {0}", bytesToAdd));
//If necessary, push the return value onto the stack.
if (returnItem.sizeOnStackInBytes != 0)
{
//SUPPORT - floats (with above)
//The return value was stored in eax
//So push it back onto the stack
if (returnItem.sizeOnStackInBytes == 4)
{
result.AppendLine("push dword eax");
}
else if (returnItem.sizeOnStackInBytes == 8)
{
result.AppendLine("push dword edx");
result.AppendLine("push dword eax");
}
}
}
else
{
//Normal callvirt
// - Get object ref from loaded args
// - Check object ref not null
// - Get type table entry from object ref
// - Get method table from type table entry
// - Scan method table for the method we want
// - If found, load method address
// - Else, check for parent type method table
// - If no parent type method table, throw exception
// - Else, scan parent type method table
string methodIDValueWanted = aScannerState.GetMethodIDValue((MethodInfo)methodToCall);
string loopTableEntries_Label = string.Format("{0}.IL_{1}_LoopMethodTable",
aScannerState.GetMethodID(aScannerState.CurrentILChunk.Method),
anILOpInfo.Position);
string notEqual_Label = string.Format("{0}.IL_{1}_NotEqual",
aScannerState.GetMethodID(aScannerState.CurrentILChunk.Method),
anILOpInfo.Position);
string endOfTable_Label = string.Format("{0}.IL_{1}_EndOfTable",
aScannerState.GetMethodID(aScannerState.CurrentILChunk.Method),
anILOpInfo.Position);
string notFound_Label = string.Format("{0}.IL_{1}_NotFound",
aScannerState.GetMethodID(aScannerState.CurrentILChunk.Method),
anILOpInfo.Position);
string notNull_Label = string.Format("{0}.IL_{1}_NotNullMem",
aScannerState.GetMethodID(aScannerState.CurrentILChunk.Method),
anILOpInfo.Position);
DB_Type declaringDBType = DebugDatabase.GetType(aScannerState.GetTypeID(methodToCall.DeclaringType));
//Get object ref
int bytesForAllParams = ((MethodInfo)methodToCall).GetParameters().Select(x => Utils.GetNumBytesForType(x.ParameterType)).Sum();
GlobalMethods.InsertPageFaultDetection(result, aScannerState, "esp", bytesForAllParams, (OpCodes)anILOpInfo.opCode.Value);
result.AppendLine(string.Format("mov dword eax, [esp+{0}]", bytesForAllParams));
//Check object ref
result.AppendLine("cmp eax, 0");
result.AppendLine(string.Format("jnz {0}", notNull_Label));
result.AppendLine("call GetEIP");
result.AppendLine(string.Format("call {0}", aScannerState.GetMethodID(aScannerState.HaltMethod)));
result.AppendLine(notNull_Label + ":");
//Get type ref
int typeOffset = aScannerState.GetFieldOffset(declaringDBType, "_Type");
GlobalMethods.InsertPageFaultDetection(result, aScannerState, "eax", typeOffset, (OpCodes)anILOpInfo.opCode.Value);
result.AppendLine(string.Format("mov eax, [eax+{0}]", typeOffset));
//Get method table ref
int methodTablePtrOffset = aScannerState.GetTypeFieldOffset("MethodTablePtr");
GlobalMethods.InsertPageFaultDetection(result, aScannerState, "eax", methodTablePtrOffset, (OpCodes)anILOpInfo.opCode.Value);
result.AppendLine(string.Format("mov eax, [eax+{0}]", methodTablePtrOffset));
//Loop through entries
result.AppendLine(loopTableEntries_Label + ":");
//Load ID Val for current entry
GlobalMethods.InsertPageFaultDetection(result, aScannerState, "eax", 0, (OpCodes)anILOpInfo.opCode.Value);
result.AppendLine("mov ebx, [eax]");
//Compare to wanted ID value
result.AppendLine("cmp ebx, " + methodIDValueWanted);
//If equal, load method address into eax
result.AppendLine("jne " + notEqual_Label);
GlobalMethods.InsertPageFaultDetection(result, aScannerState, "eax", 4, (OpCodes)anILOpInfo.opCode.Value);
result.AppendLine("mov eax, [eax+4]");
result.AppendLine("jmp " + call_Label);
result.AppendLine(notEqual_Label + ":");
//Else, compare to 0 to check for end of table
result.AppendLine("cmp ebx, 0");
result.AppendLine("jz " + endOfTable_Label);
//Not 0? Move to next entry then loop again
result.AppendLine("add eax, 8");
result.AppendLine("jmp " + loopTableEntries_Label);
result.AppendLine(endOfTable_Label + ":");
//Compare address value to 0
//If not zero, there is a parent method table to check
GlobalMethods.InsertPageFaultDetection(result, aScannerState, "eax", 4, (OpCodes)anILOpInfo.opCode.Value);
result.AppendLine("mov ebx, [eax+4]");
result.AppendLine("cmp ebx, 0");
result.AppendLine("jz " + notFound_Label);
//Load parent method table and loop
result.AppendLine("mov eax, ebx");
result.AppendLine("jmp " + loopTableEntries_Label);
result.AppendLine(notFound_Label + ":");
//Throw exception!
result.AppendLine(string.Format("call {0}", aScannerState.GetMethodID(aScannerState.ThrowNullReferenceExceptionMethod)));
result.AppendLine(call_Label + ":");
//Allocate space on the stack for the return value as necessary
Type retType = ((MethodInfo)methodToCall).ReturnType;
StackItem returnItem = new StackItem()
{
isFloat = Utils.IsFloat(retType),
sizeOnStackInBytes = Utils.GetNumBytesForType(retType),
isGCManaged = Utils.IsGCManaged(retType)
};
//We do not push the return value onto the stack unless it has size > 0
//We do not push the return value onto our stack at this point - it is pushed after the call is done
if (returnItem.sizeOnStackInBytes != 0)
{
if (returnItem.isFloat)
{
//SUPPORT - floats
throw new NotSupportedException("Cannot handle float return values!");
}
else if (returnItem.sizeOnStackInBytes == 4)
{
result.AppendLine("push dword 0");
}
else if (returnItem.sizeOnStackInBytes == 8)
{
result.AppendLine("push dword 0");
result.AppendLine("push dword 0");
}
else
{
throw new NotSupportedException("Invalid return stack operand size!");
}
}
//Append the actual call
result.AppendLine("call eax");
//After a call, we need to remove the return value and parameters from the stack
//This is most easily done by just adding the total number of bytes for params and
//return value to the stack pointer (ESP register).
//Stores the number of bytes to add
int bytesToAdd = 0;
//All the parameters for the method that was called
List<Type> allParams = ((MethodInfo)methodToCall).GetParameters().Select(x => x.ParameterType).ToList();
//Go through each one
if (!methodToCall.IsStatic)
{
allParams.Insert(0, methodToCall.DeclaringType);
}
foreach (Type aParam in allParams)
{
//Pop the paramter off our stack
//(Note: Return value was never pushed onto our stack. See above)
aScannerState.CurrentStackFrame.Stack.Pop();
//Add the size of the paramter to the total number of bytes to pop
bytesToAdd += Utils.GetNumBytesForType(aParam);
}
//If the number of bytes to add to skip over params is > 0
if (bytesToAdd > 0)
{
//If there is a return value on the stack
if (returnItem.sizeOnStackInBytes != 0)
{
//We need to store the return value then pop all the params
//We now push the return value onto our stack as,
//after all is said and done below, it will be the
//top item on the stack
aScannerState.CurrentStackFrame.Stack.Push(returnItem);
//SUPPORT - floats (with above)
//Pop the return value into the eax register
//We will push it back on after params are skipped over.
if (returnItem.sizeOnStackInBytes == 4)
{
result.AppendLine("pop dword eax");
}
else if (returnItem.sizeOnStackInBytes == 8)
{
result.AppendLine("pop dword eax");
result.AppendLine("pop dword edx");
}
}
//Skip over the params
result.AppendLine(string.Format("add esp, {0}", bytesToAdd));
//If necessary, push the return value onto the stack.
if (returnItem.sizeOnStackInBytes != 0)
{
//SUPPORT - floats (with above)
//The return value was stored in eax
//So push it back onto the stack
if (returnItem.sizeOnStackInBytes == 4)
{
result.AppendLine("push dword eax");
}
else if (returnItem.sizeOnStackInBytes == 8)
{
result.AppendLine("push dword edx");
result.AppendLine("push dword eax");
}
}
}
//No params to skip over but we might still need to store return value
else if (returnItem.sizeOnStackInBytes != 0)
{
//The return value will be the top item on the stack.
//So all we need to do is push the return item onto our stack.
aScannerState.CurrentStackFrame.Stack.Push(returnItem);
}
}
}
else if(methodToCall is ConstructorInfo)
{
throw new NotSupportedException("How the hell are we getting callvirts to constructor methods?!");
}
return result.ToString().Trim();
}
/// <summary>
/// See base class documentation.
/// </summary>
/// <param name="anILOpInfo">See base class documentation.</param>
/// <param name="aScannerState">See base class documentation.</param>
/// <returns>See base class documentation.</returns>
/// <exception cref="System.NotSupportedException">
/// Thrown if constant is a floating point number.
/// </exception>
public override string Convert(ILOpInfo anILOpInfo, ILScannerState aScannerState)
{
StringBuilder result = new StringBuilder();
Type elementType = null;
bool pushValue = true;
int sizeToPush = 4;
bool signExtend = true;
bool isFloat = false;
switch ((OpCodes)anILOpInfo.opCode.Value)
{
case OpCodes.Ldelem:
{
signExtend = false;
//Load the metadata token used to get the type info
int metadataToken = Utils.ReadInt32(anILOpInfo.ValueBytes, 0);
//Get the type info for the element type
elementType = aScannerState.CurrentILChunk.Method.Module.ResolveType(metadataToken);
}
break;
case OpCodes.Ldelema:
{
signExtend = false;
//Load the metadata token used to get the type info
int metadataToken = Utils.ReadInt32(anILOpInfo.ValueBytes, 0);
//Get the type info for the element type
elementType = aScannerState.CurrentILChunk.Method.Module.ResolveType(metadataToken);
}
break;
case OpCodes.Ldelem_R4:
case OpCodes.Ldelem_R8:
//TODO - Add more LdElem op variants support
throw new NotSupportedException("Ldelem op variant not supported yet!");
case OpCodes.Ldelem_I1:
sizeToPush = 1;
elementType = typeof(sbyte);
break;
case OpCodes.Ldelem_I2:
sizeToPush = 2;
elementType = typeof(Int16);
break;
case OpCodes.Ldelem_U1:
sizeToPush = 1;
signExtend = false;
elementType = typeof(byte);
break;
case OpCodes.Ldelem_U2:
sizeToPush = 2;
signExtend = false;
elementType = typeof(UInt16);
break;
case OpCodes.Ldelem_Ref:
signExtend = false;
elementType = null;
break;
case OpCodes.Ldelem_U4:
signExtend = false;
elementType = typeof(UInt32);
break;
case OpCodes.Ldelem_I4:
elementType = typeof(Int32);
break;
case OpCodes.Ldelem_I8:
elementType = typeof(Int64);
break;
}
if (isFloat)
{
//TODO - Support floats
throw new NotSupportedException("LdElem for floats not supported yet!");
}
//Get element from array and push the value onto the stack
// (or for LdElemA push the address of the value)
//This involves:
// 1. Check array reference is not null
// - If it is, throw NullReferenceException
// 2. Check array element type is correct
// - If not, throw ArrayTypeMismatchException
// 3. Check index to get is > -1 and < array length
// - If not, throw IndexOutOfRangeException
// 4. Calculate address of element
// 5. Push the element onto the stack
//Stack setup upon entering this op: (top-most downwards)
// 0. Index of element to get as Int32 (dword)
// 1. Array object reference as address (dword)
string ContinueExecutionLabelBase = string.Format("{0}.IL_{1}_Load_ContinueExecution",
aScannerState.GetMethodID(aScannerState.CurrentILChunk.Method),
anILOpInfo.Position);
DB_Type arrayDBType = DebugDatabase.GetType(aScannerState.GetTypeID(aScannerState.ArrayClass));
// 1. Check array reference is not null
// 1.1. Move array ref into eax
// 1.2. Compare eax (array ref) to 0
// 1.3. If not zero, jump to continue execution further down
// 1.4. Otherwise, call Exceptions.ThrowNullReferenceException
string ContinueExecutionLabel1 = ContinueExecutionLabelBase + "1";
// 1.1. Move array ref into eax
GlobalMethods.InsertPageFaultDetection(result, aScannerState, "esp", 4, (OpCodes)anILOpInfo.opCode.Value);
result.AppendLine("mov eax, [esp+4]");
// 1.2. Compare eax (array ref) to 0
result.AppendLine("cmp eax, 0");
// 1.3. If not zero, jump to continue execution further down
result.AppendLine("jnz " + ContinueExecutionLabel1);
// 1.4. Otherwise, call Exceptions.ThrowNullReferenceException
result.AppendLine(string.Format("call {0}", aScannerState.GetMethodID(aScannerState.ThrowNullReferenceExceptionMethod)));
result.AppendLine(ContinueExecutionLabel1 + ":");
// 2. Check array element type is correct
// 2.1. Move element type ref into eax
// 2.2. Move element type ref from array object into ebx
// 2.3. Compare eax to ebx
// 2.4. If the same, jump to continue execution further down
// 2.5. Otherwise, call Exceptions.ThrowArrayTypeMismatchException
//string ContinueExecutionLabel2 = ContinueExecutionLabelBase + "2";
//// 2.1. Move element type ref into eax
int elemTypeOffset = aScannerState.GetFieldOffset(arrayDBType, "elemType");
//if (elementType != null)
//{
// result.AppendLine(string.Format("mov eax, {0}", aScannerState.GetTypeIdString(aScannerState.GetTypeID(elementType))));
// // 2.2. Move element type ref from array object into ebx
// // - Calculate the offset of the field from the start of the array object
// // - Move array ref into ebx
//GlobalMethods.CheckAddrFromRegister(result, aScannerState, "esp", 4);
// result.AppendLine("mov ebx, [esp+4]");
// // - Move elemType ref ([ebx+offset]) into ebx
// GlobalMethods.CheckAddrFromRegister(result, aScannerState, "ebx", elemTypeOffset);
// result.AppendLine(string.Format("mov ebx, [ebx+{0}]", elemTypeOffset));
// // 2.3. Compare eax to ebx
// result.AppendLine("cmp eax, ebx");
// // 2.4. If the same, jump to continue execution further down
// result.AppendLine("je " + ContinueExecutionLabel2);
// // 2.5. Otherwise, call Exceptions.ThrowArrayTypeMismatchException
// result.AppendLine(string.Format("call {0}", aScannerState.GetMethodID(aScannerState.ThrowArrayTypeMismatchExceptionMethod)));
// result.AppendLine(ContinueExecutionLabel2 + ":");
//}
// 3. Check index to get is > -1 and < array length
// 3.1. Move index into eax
// 3.2. Move array length into ebx
// 3.2. Compare eax to 0
// 3.3. Jump if greater than to next test condition (3.5)
// 3.4. Otherwise, call Exceptions.ThrowIndexOutOfRangeException
// 3.5. Compare eax to ebx
// 3.6. Jump if less than to continue execution further down
// 3.7. Otherwise, call Exceptions.ThrowIndexOutOfRangeException
string ContinueExecutionLabel3_1 = ContinueExecutionLabelBase + "3_1";
string ContinueExecutionLabel3_2 = ContinueExecutionLabelBase + "3_2";
// 3.1. Move index into eax
GlobalMethods.InsertPageFaultDetection(result, aScannerState, "esp", 0, (OpCodes)anILOpInfo.opCode.Value);
result.AppendLine("mov eax, [esp]");
// 3.2. Move array length into ecx
// - Calculate the offset of the field from the start of the array object
int lengthOffset = aScannerState.GetFieldOffset(arrayDBType, "length");
// - Move array ref into ebx
GlobalMethods.InsertPageFaultDetection(result, aScannerState, "esp", 4, (OpCodes)anILOpInfo.opCode.Value);
result.AppendLine("mov ebx, [esp+4]");
// - Move length value ([ebx+offset]) into ebx
GlobalMethods.InsertPageFaultDetection(result, aScannerState, "ebx", lengthOffset, (OpCodes)anILOpInfo.opCode.Value);
result.AppendLine(string.Format("mov ebx, [ebx+{0}]", lengthOffset));
// 3.2. Compare eax to 0
result.AppendLine("cmp eax, 0");
// 3.3. Jump if greater than to next test condition (3.5)
result.AppendLine("jge " + ContinueExecutionLabel3_1);
// 3.4. Otherwise, call Exceptions.ThrowIndexOutOfRangeException
result.AppendLine(string.Format("call {0}", aScannerState.GetMethodID(aScannerState.ThrowIndexOutOfRangeExceptionMethod)));
result.AppendLine(ContinueExecutionLabel3_1 + ":");
// 3.5. Compare eax to ebx
result.AppendLine("cmp eax, ebx");
// 3.6. Jump if less than to continue execution further down
result.AppendLine("jl " + ContinueExecutionLabel3_2);
// 3.7. Otherwise, call Exceptions.ThrowIndexOutOfRangeException
result.AppendLine(string.Format("call {0}", aScannerState.GetMethodID(aScannerState.ThrowIndexOutOfRangeExceptionMethod)));
result.AppendLine(ContinueExecutionLabel3_2 + ":");
// 4. Calculate address of element
// 4.1. Pop index into ebx
// 4.2. Pop array ref into eax
// 4.3. Move element type ref (from array ref) into eax
// 4.4. Move IsValueType (from element ref type) into ecx
// 4.5. If IsValueType, continue to 4.6., else goto 4.8.
// 4.6. Move Size (from element type ref) into eax
// 4.7. Skip over 4.8.
// 4.8. Move StackSize (from element type ref) into eax
// 4.9. Mulitply eax by ebx (index by element size)
// 4.10. Move array ref into ebx
// 4.11. Add enough to go past Kernel.FOS_System.Array fields
// 4.12. Add eax and ebx (array ref + fields + (index * element size))
string ContinueExecutionLabel4_1 = ContinueExecutionLabelBase + "4_1";
string ContinueExecutionLabel4_2 = ContinueExecutionLabelBase + "4_2";
// 4.1. Pop index into ebx
result.AppendLine("pop ebx");
// 4.2. Move array ref into eax
GlobalMethods.InsertPageFaultDetection(result, aScannerState, "esp", 0, (OpCodes)anILOpInfo.opCode.Value);
result.AppendLine("mov eax, [esp]");
// 4.3. Move element type ref (from array ref) into eax
GlobalMethods.InsertPageFaultDetection(result, aScannerState, "eax", elemTypeOffset, (OpCodes)anILOpInfo.opCode.Value);
result.AppendLine(string.Format("mov eax, [eax+{0}]", elemTypeOffset));
// 4.4. Move IsValueType (from element ref type) into ecx
int isValueTypeOffset = aScannerState.GetTypeFieldOffset("IsValueType");
result.AppendLine("mov ecx, 0");
GlobalMethods.InsertPageFaultDetection(result, aScannerState, "eax", isValueTypeOffset, (OpCodes)anILOpInfo.opCode.Value);
result.AppendLine(string.Format("mov byte cl, [eax+{0}]", isValueTypeOffset));
// 4.5. If IsValueType, continue to 4.6., else goto 4.8.
result.AppendLine("cmp ecx, 0");
result.AppendLine("jz " + ContinueExecutionLabel4_1);
// 4.6. Move Size (from element type ref) into eax
int sizeOffset = aScannerState.GetTypeFieldOffset("Size");
GlobalMethods.InsertPageFaultDetection(result, aScannerState, "eax", sizeOffset, (OpCodes)anILOpInfo.opCode.Value);
result.AppendLine(string.Format("mov eax, [eax+{0}]", sizeOffset));
// 4.7. Skip over 4.8.
result.AppendLine("jmp " + ContinueExecutionLabel4_2);
// 4.8. Move StackSize (from element type ref) into eax
result.AppendLine(ContinueExecutionLabel4_1 + ":");
int stackSizeOffset = aScannerState.GetTypeFieldOffset("StackSize");
GlobalMethods.InsertPageFaultDetection(result, aScannerState, "eax", stackSizeOffset, (OpCodes)anILOpInfo.opCode.Value);
result.AppendLine(string.Format("mov eax, [eax+{0}]", stackSizeOffset));
// 4.9. Mulitply eax by ebx (index by element size)
result.AppendLine(ContinueExecutionLabel4_2 + ":");
result.AppendLine("mul ebx");
// 4.10. Pop array ref into ebx
result.AppendLine("pop ebx");
// 4.11. Add enough to go past Kernel.FOS_System.Array fields
int allFieldsOffset = 0;
#region Offset calculation
{
//Get the child links of the type (i.e. the fields of the type)
List<DB_ComplexTypeLink> allChildLinks = arrayDBType.ChildTypes.ToList();
//Calculate the offset
//We use StackBytesSize since fields that are reference types are only stored as a pointer
allFieldsOffset = allChildLinks.Sum(x => x.ChildType.IsValueType ? x.ChildType.BytesSize : x.ChildType.StackBytesSize);
}
#endregion
result.AppendLine(string.Format("add ebx, {0}", allFieldsOffset));
// 4.12. Add eax and ebx (array ref + fields + (index * element size))
result.AppendLine("add eax, ebx");
// 5. Push the element onto the stack
// 5.1. Push value at [eax] (except for LdElemA op in which case just push address)
if (pushValue)
{
switch (sizeToPush)
{
case 1:
result.AppendLine("mov dword ebx, 0");
GlobalMethods.InsertPageFaultDetection(result, aScannerState, "eax", 0, (OpCodes)anILOpInfo.opCode.Value);
result.AppendLine("mov byte bl, [eax]");
if (signExtend)
{
throw new NotSupportedException("Sign extend byte to 4 bytes in LdElem not supported!");
}
break;
case 2:
result.AppendLine("mov dword ebx, 0");
GlobalMethods.InsertPageFaultDetection(result, aScannerState, "eax", 0, (OpCodes)anILOpInfo.opCode.Value);
result.AppendLine("mov word bx, [eax]");
if (signExtend)
{
result.AppendLine("cwde");
}
break;
case 4:
GlobalMethods.InsertPageFaultDetection(result, aScannerState, "eax", 0, (OpCodes)anILOpInfo.opCode.Value);
result.AppendLine("mov dword ebx, [eax]");
break;
case 8:
GlobalMethods.InsertPageFaultDetection(result, aScannerState, "eax", 0, (OpCodes)anILOpInfo.opCode.Value);
result.AppendLine("mov word ebx, [eax]");
GlobalMethods.InsertPageFaultDetection(result, aScannerState, "eax", 4, (OpCodes)anILOpInfo.opCode.Value);
result.AppendLine("mov word ecx, [eax+4]");
break;
}
if (sizeToPush == 8)
{
result.AppendLine("push ecx");
}
result.AppendLine("push ebx");
}
else
{
result.AppendLine("push eax");
}
// 5.2. Pop index and array ref from our stack
aScannerState.CurrentStackFrame.Stack.Pop();
aScannerState.CurrentStackFrame.Stack.Pop();
// 5.3. Push element onto our stack
aScannerState.CurrentStackFrame.Stack.Push(new StackItem()
{
sizeOnStackInBytes = sizeToPush > 4 ? 8 : 4,
isFloat = isFloat,
isNewGCObject = false,
isGCManaged = pushValue ? Utils.IsGCManaged(elementType) : false
});
return result.ToString().Trim();
}
/// <summary>
/// See base class documentation.
/// </summary>
/// <param name="anILOpInfo">See base class documentation.</param>
/// <param name="aScannerState">See base class documentation.</param>
/// <returns>See base class documentation.</returns>
/// <exception cref="System.NotSupportedException">
/// Thrown when loading a static float field.
/// </exception>
public override string Convert(ILOpInfo anILOpInfo, ILScannerState aScannerState)
{
StringBuilder result = new StringBuilder();
//Load static field
//Load the metadata token used to get the field info
int metadataToken = Utils.ReadInt32(anILOpInfo.ValueBytes, 0);
//Get the field info for the field to load
FieldInfo theField = aScannerState.CurrentILChunk.Method.Module.ResolveField(metadataToken);
//Get the ID (i.e. ASM label) of the field to load
string fieldID = aScannerState.GetStaticFieldID(theField);
//Load the field or field address
switch ((OpCodes)anILOpInfo.opCode.Value)
{
case OpCodes.Ldsfld:
{
int size = Utils.GetNumBytesForType(theField.FieldType);
bool isFloat = Utils.IsFloat(theField.FieldType);
if (isFloat)
{
//SUPPORT - floats
throw new NotSupportedException("Loading static fields of type float not supported yet!");
}
if(size == 1)
{
result.AppendLine("xor eax, eax");
result.AppendLine(string.Format("mov byte al, [{0}]", fieldID));
result.AppendLine("push dword eax");
}
else if(size == 2)
{
result.AppendLine("xor eax, eax");
result.AppendLine(string.Format("mov word ax, [{0}]", fieldID));
result.AppendLine("push dword eax");
}
else if(size == 4)
{
result.AppendLine(string.Format("mov dword eax, [{0}]", fieldID));
result.AppendLine("push dword eax");
}
else if (size == 8)
{
result.AppendLine(string.Format("mov dword eax, [{0}+4]", fieldID));
result.AppendLine("push dword eax");
result.AppendLine(string.Format("mov dword eax, [{0}]", fieldID));
result.AppendLine("push dword eax");
}
aScannerState.CurrentStackFrame.Stack.Push(new StackItem()
{
isFloat = isFloat,
sizeOnStackInBytes = (size == 8 ? 8 : 4),
isGCManaged = Utils.IsGCManaged(theField.FieldType)
});
}
break;
case OpCodes.Ldsflda:
//Load the address of the field i.e. address of the ASM label
result.AppendLine(string.Format("push dword {0}", fieldID));
aScannerState.CurrentStackFrame.Stack.Push(new StackItem()
{
isFloat = false,
sizeOnStackInBytes = 4,
isGCManaged = false
});
break;
}
return result.ToString().Trim();
}
/// <summary>
/// See base class documentation.
/// </summary>
/// <param name="anILOpInfo">See base class documentation.</param>
/// <param name="aScannerState">See base class documentation.</param>
/// <returns>See base class documentation.</returns>
/// <exception cref="System.NotSupportedException">
/// Thrown if the either of the values to add are floating point.
/// </exception>
/// <exception cref="System.InvalidOperationException">
/// Thrown if the either of the values to add are less than 4 bytes in size
/// or if they are of different sizes.
/// </exception>
public override string Convert(ILOpInfo anILOpInfo, ILScannerState aScannerState)
{
StringBuilder result = new StringBuilder();
//Pop the operands from our stack in reverse order
//i.e. second operand was pushed last so comes off the
//top of the stack first
//Pop item B - one of the items to subtract
StackItem itemB = aScannerState.CurrentStackFrame.Stack.Pop();
//Pop item A - the other item to subtract
StackItem itemA = aScannerState.CurrentStackFrame.Stack.Pop();
//If either item item is < 4 bytes then we have a stack error.
if (itemB.sizeOnStackInBytes < 4 ||
itemA.sizeOnStackInBytes < 4)
{
throw new InvalidOperationException("Invalid stack operand sizes!");
}
//If either item is floating point, we must use floating point conversions
//and floating point arithmetic
else if (itemB.isFloat || itemA.isFloat)
{
//SUPPORT - floats
// - We need to convert items to float if necessary
// - Then use floating point arithmetic
// - Then push the result onto the stack and mark it as float
// Note: Check but I think floating point arithmetic is done using
// XMM registers and their specific ops.
throw new NotSupportedException("Add floats is unsupported!");
}
else
{
//If both items are Int32s (or UInt32s - it is irrelevant)
//Note: IL handles type conversions using other ops
if (itemA.sizeOnStackInBytes == 4 &&
itemB.sizeOnStackInBytes == 4)
{
//Pop item B
result.AppendLine("pop dword ebx");
//Pop item A
result.AppendLine("pop dword eax");
//Subtract the two
result.AppendLine("sub eax, ebx");
//Push the result onto the stack
result.AppendLine("push dword eax");
//Push the result onto our stack
aScannerState.CurrentStackFrame.Stack.Push(new StackItem()
{
isFloat = false,
sizeOnStackInBytes = 4,
isGCManaged = false
});
}
//Invalid if the operands are of different sizes.
//Note: This usually occurs when a previous IL op failed to process properly.
else if ((itemA.sizeOnStackInBytes == 8 &&
itemB.sizeOnStackInBytes == 4) ||
(itemA.sizeOnStackInBytes == 4 &&
itemB.sizeOnStackInBytes == 8))
{
throw new InvalidOperationException("Invalid stack operand sizes! They should be the same size.");
}
else if (itemA.sizeOnStackInBytes == 8 &&
itemB.sizeOnStackInBytes == 8)
{
//Pop item B to ecx:ebx
//Pop low bits
result.AppendLine("pop dword ebx");
//Pop high bits
result.AppendLine("pop dword ecx");
//Pop item A to edx:eax
//Pop low bits
result.AppendLine("pop dword eax");
//Pop high bits
result.AppendLine("pop dword edx");
//Sub ecx:ebx from edx:eax
//Sub low bits
result.AppendLine("sub eax, ebx");
//Sub high bits including any borrow from
//when low bits were subtracted
result.AppendLine("sbb edx, ecx");
//Push the result
//Push high bits
result.AppendLine("push dword edx");
//Push low bits
result.AppendLine("push dword eax");
//Push the result onto our stack
aScannerState.CurrentStackFrame.Stack.Push(new StackItem()
{
isFloat = false,
sizeOnStackInBytes = 8,
isGCManaged = false
});
}
}
return result.ToString().Trim();
}
/// <summary>
/// See base class documentation.
/// </summary>
/// <param name="anILOpInfo">See base class documentation.</param>
/// <param name="aScannerState">See base class documentation.</param>
/// <returns>See base class documentation.</returns>
/// <exception cref="System.NotSupportedException">
/// Thrown if divide operands are floating point numbers or if attempting to divide 64-bit numbers.
/// </exception>
/// <exception cref="System.InvalidOperationException">
/// Thrown if either operand is < 4 bytes long.
/// </exception>
public override string Convert(ILOpInfo anILOpInfo, ILScannerState aScannerState)
{
StringBuilder result = new StringBuilder();
//Pop in reverse order to push
StackItem itemB = aScannerState.CurrentStackFrame.Stack.Pop();
StackItem itemA = aScannerState.CurrentStackFrame.Stack.Pop();
if (itemB.sizeOnStackInBytes < 4 ||
itemA.sizeOnStackInBytes < 4)
{
throw new InvalidOperationException("Invalid stack operand sizes!");
}
else if (itemB.isFloat || itemA.isFloat)
{
//SUPPORT - floats
throw new NotSupportedException("Divide floats is unsupported!");
}
else
{
if (itemA.sizeOnStackInBytes == 4 &&
itemB.sizeOnStackInBytes == 4)
{
//Pop item B
result.AppendLine("pop dword ebx");
//Pop item A
result.AppendLine("pop dword eax");
if ((OpCodes)anILOpInfo.opCode.Value == OpCodes.Div_Un)
{
//Unsigned extend A to EAX:EDX
result.AppendLine("mov edx, 0");
//Do the division
result.AppendLine("div ebx");
}
else
{
//Sign extend A to EAX:EDX
result.AppendLine("cdq");
//Do the division
result.AppendLine("idiv ebx");
}
//Result stored in eax
result.AppendLine("push dword eax");
aScannerState.CurrentStackFrame.Stack.Push(new StackItem()
{
isFloat = false,
sizeOnStackInBytes = 4,
isGCManaged = false
});
}
else if ((itemA.sizeOnStackInBytes == 8 &&
itemB.sizeOnStackInBytes == 4) ||
(itemA.sizeOnStackInBytes == 4 &&
itemB.sizeOnStackInBytes == 8))
{
throw new InvalidOperationException("Invalid stack operand sizes! They should be the 32-32 or 64-64.");
}
else if (itemA.sizeOnStackInBytes == 8 &&
itemB.sizeOnStackInBytes == 8)
{
//SUPPORT - 64-bit division
throw new NotSupportedException("64-bit by 64-bit division not supported yet!");
}
}
return result.ToString().Trim();
}
/// <summary>
/// See base class documentation.
/// </summary>
/// <param name="anILOpInfo">See base class documentation.</param>
/// <param name="aScannerState">See base class documentation.</param>
/// <returns>See base class documentation.</returns>
/// <exception cref="System.NotSupportedException">
/// Thrown if the value to store is floating point.
/// </exception>
/// <exception cref="System.NotImplementedException">
/// Thrown if the op is 'StIndRef'.
/// </exception>
public override string Convert(ILOpInfo anILOpInfo, ILScannerState aScannerState)
{
StringBuilder result = new StringBuilder();
//Pop value
//Pop address
//Mov [address], value
StackItem valueItem = aScannerState.CurrentStackFrame.Stack.Pop();
StackItem addressItem = aScannerState.CurrentStackFrame.Stack.Pop();
int bytesToStore = 0;
bool isFloat = false;
switch ((OpCodes)anILOpInfo.opCode.Value)
{
case OpCodes.Stind_I:
bytesToStore = 4;
break;
case OpCodes.Stind_I1:
bytesToStore = 1;
break;
case OpCodes.Stind_I2:
bytesToStore = 2;
break;
case OpCodes.Stind_I4:
bytesToStore = 4;
break;
case OpCodes.Stind_I8:
bytesToStore = 8;
break;
case OpCodes.Stind_R4:
bytesToStore = 4;
isFloat = true;
break;
case OpCodes.Stind_R8:
bytesToStore = 8;
isFloat = true;
break;
case OpCodes.Stind_Ref:
bytesToStore = 4;
break;
}
if(isFloat)
{
//SUPPORT - floats
throw new NotSupportedException("Floats not supported yet!");
}
if (bytesToStore == 8)
{
//Pop value low bits
result.AppendLine("pop dword eax");
//Pop value high bits
result.AppendLine("pop dword edx");
//Pop address
result.AppendLine("pop dword ebx");
//Mov [address], value
GlobalMethods.InsertPageFaultDetection(result, aScannerState, "ebx", 4, (OpCodes)anILOpInfo.opCode.Value);
result.AppendLine("mov dword [ebx+4], edx");
GlobalMethods.InsertPageFaultDetection(result, aScannerState, "ebx", 0, (OpCodes)anILOpInfo.opCode.Value);
result.AppendLine("mov dword [ebx], eax");
}
else if (bytesToStore == 4)
{
//Pop value
result.AppendLine("pop dword eax");
//Pop address
result.AppendLine("pop dword ebx");
//Mov [address], value
GlobalMethods.InsertPageFaultDetection(result, aScannerState, "ebx", 0, (OpCodes)anILOpInfo.opCode.Value);
result.AppendLine("mov dword [ebx], eax");
}
else if (bytesToStore == 2)
{
//Pop value
result.AppendLine("pop dword eax");
//Pop address
result.AppendLine("pop dword ebx");
//Mov [address], value
GlobalMethods.InsertPageFaultDetection(result, aScannerState, "ebx", 0, (OpCodes)anILOpInfo.opCode.Value);
result.AppendLine("mov word [ebx], ax");
}
else if (bytesToStore == 1)
{
//Pop value
result.AppendLine("pop dword eax");
//Pop address
result.AppendLine("pop dword ebx");
//Mov [address], value
GlobalMethods.InsertPageFaultDetection(result, aScannerState, "ebx", 0, (OpCodes)anILOpInfo.opCode.Value);
result.AppendLine("mov byte [ebx], al");
}
return result.ToString().Trim();
}
/// <summary>
/// See base class documentation.
/// </summary>
/// <param name="anILOpInfo">See base class documentation.</param>
/// <param name="aScannerState">See base class documentation.</param>
/// <returns>See base class documentation.</returns>
public override string Convert(ILOpInfo anILOpInfo, ILScannerState aScannerState)
{
StringBuilder result = new StringBuilder();
//Load the metadata token used to get the type info
int metadataToken = Utils.ReadInt32(anILOpInfo.ValueBytes, 0);
//Get the type info for the element type
Type elementType = aScannerState.CurrentILChunk.Method.Module.ResolveType(metadataToken);
//New array must:
// - Allocate memory on the heap for the object
// - If no memory is left, throw a panic attack because we're out of memory...
// - Call the specified constructor
//The label to jump to if allocated memory isn't null
//i.e. not out of memory.
string NotNullLabel = string.Format("{0}.IL_{1}_NotNullMem",
aScannerState.GetMethodID(aScannerState.CurrentILChunk.Method),
anILOpInfo.Position);
//Attempt to allocate memory on the heap for the new array
//This involves:
// - (Number of elements is already on the stack)
// - Pushing the element type reference onto the stack
// - Calling GC NewArr method
// - Check the pointer == 0, if so, out of memory
//Push type reference
string typeIdStr = aScannerState.GetTypeIdString(aScannerState.GetTypeID(elementType));
result.AppendLine(string.Format("push dword {0}", typeIdStr));
//Push a dword for return value (i.e. new array pointer)
result.AppendLine("push dword 0");
//Get the GC.NewArr method ID (i.e. ASM label)
string methodLabel = aScannerState.GetMethodID(aScannerState.NewArrMethod);
//Call GC.NewArr
result.AppendLine(string.Format("call {0}", methodLabel));
//Pop the return value (i.e. new array pointer)
result.AppendLine("pop dword eax");
//Remove args from stack
result.AppendLine("add esp, 8");
//Check if pointer == 0?
result.AppendLine("cmp eax, 0");
//If it isn't 0, not out of memory so continue execution
result.AppendLine(string.Format("jnz {0}", NotNullLabel));
//If we are out of memory, we have a massive problem
//Because it means we don't have space to create a new exception object
//So ultimately we just have to throw a kernel panic
//Throw a panic attack... ( :/ ) by calling kernel Halt(uint lastAddress)
//result.AppendLine("call GetEIP");
//result.AppendLine("push dword esp");
//result.AppendLine("push dword ebp");
//result.AppendLine("pushad");
//result.AppendLine("mov dword eax, 0xDEADBEEF");
//result.AppendLine("mov dword ebx, 0x2");
//result.AppendLine("mov dword ecx, 1");
//result.AppendLine("mov dword [staticfield_System_Boolean_Kernel_FOS_System_GC_Enabled], 1");
//result.AppendLine("mov dword [staticfield_System_Boolean_Kernel_FOS_System_Heap_PreventAllocation], 0");
//result.AppendLine("jmp method_System_Void_RETEND_Kernel_PreReqs_DECLEND_PageFaultDetection_NAMEEND___Fail");
result.AppendLine("call GetEIP");
result.AppendLine(string.Format("call {0}", aScannerState.GetMethodID(aScannerState.HaltMethod)));
//Insert the not null label
result.AppendLine(NotNullLabel + ":");
//Push new array pointer
result.AppendLine("push dword eax");
aScannerState.CurrentStackFrame.Stack.Push(new StackItem()
{
isFloat = false,
sizeOnStackInBytes = 4,
isNewGCObject = true,
isGCManaged = true
});
return result.ToString().Trim();
}
/// <summary>
/// See base class documentation.
/// </summary>
/// <param name="anILOpInfo">See base class documentation.</param>
/// <param name="aScannerState">See base class documentation.</param>
/// <returns>See base class documentation.</returns>
public override string Convert(ILOpInfo anILOpInfo, ILScannerState aScannerState)
{
StringBuilder result = new StringBuilder();
StackItem itemToConvert = aScannerState.CurrentStackFrame.Stack.Pop();
int numBytesToConvertTo = 0;
switch ((OpCodes)anILOpInfo.opCode.Value)
{
case OpCodes.Conv_I:
numBytesToConvertTo = 4;
break;
case OpCodes.Conv_I1:
numBytesToConvertTo = 1;
break;
case OpCodes.Conv_I2:
numBytesToConvertTo = 2;
break;
case OpCodes.Conv_I4:
numBytesToConvertTo = 4;
break;
case OpCodes.Conv_I8:
numBytesToConvertTo = 8;
break;
}
int bytesPopped = 0;
bool pushEDX = false;
switch(numBytesToConvertTo)
{
case 1:
//Convert to Int8 (byte)
//Sign extend to dword
result.AppendLine("mov eax, 0");
result.AppendLine("pop byte al");
bytesPopped = 1;
break;
case 2:
//Convert to Int16 (word)
//Sign extend to dword
result.AppendLine("mov eax, 0");
result.AppendLine("pop word ax");
result.AppendLine("cwde");
bytesPopped = 2;
break;
case 4:
//Convert to Int32 (dword)
result.AppendLine("pop dword eax");
bytesPopped = 4;
break;
case 8:
//Convert to Int64
if (itemToConvert.sizeOnStackInBytes == 8)
{
//Result stored in EAX:EDX
result.AppendLine("pop dword eax");
result.AppendLine("pop dword edx");
bytesPopped = 8;
}
else
{
//Sign extend dword to qword
//Result stored in EAX:EDX
result.AppendLine("pop dword eax");
result.AppendLine("cdq");
bytesPopped = 4;
}
pushEDX = true;
break;
}
int bytesDiff = itemToConvert.sizeOnStackInBytes - bytesPopped;
if (bytesDiff > 0)
{
result.AppendLine(string.Format("add esp, {0}", bytesDiff));
}
if (pushEDX)
{
result.AppendLine("push dword edx");
}
result.AppendLine("push dword eax");
aScannerState.CurrentStackFrame.Stack.Push(new StackItem()
{
sizeOnStackInBytes = (pushEDX ? 8 : 4),
isFloat = false,
isGCManaged = false
});
return result.ToString().Trim();
}
/// <summary>
/// See base class documentation.
/// </summary>
/// <param name="anILOpInfo">See base class documentation.</param>
/// <param name="aScannerState">See base class documentation.</param>
/// <returns>See base class documentation.</returns>
/// <exception cref="System.NotSupportedException">
/// Thrown when the return value is a float or the size on the stack
/// in bytes is not 4 or 8 bytes.
/// </exception>
public override string Convert(ILOpInfo anILOpInfo, ILScannerState aScannerState)
{
StringBuilder result = new StringBuilder();
//Store the return value
//Get the return type
Type retType = (aScannerState.CurrentILChunk.Method.IsConstructor || aScannerState.CurrentILChunk.Method is ConstructorInfo ?
typeof(void) : ((MethodInfo)aScannerState.CurrentILChunk.Method).ReturnType);
//Get the size of the return type on stack
int retSize = Utils.GetNumBytesForType(retType);
//If the size isn't 0 (i.e. isn't "void" which has no return value)
if (retSize != 0)
{
//Pop the return value off our stack
StackItem retItem = aScannerState.CurrentStackFrame.Stack.Pop();
//If it is float, well, we don't support it yet...
if (retItem.isFloat)
{
//SUPPORT - floats
throw new NotSupportedException("Floats return type not supported yet!");
}
//Otherwise, store the return value at [ebp+8]
//[ebp+8] because that is last "argument"
// - read the calling convention spec
else if (retSize == 4)
{
result.AppendLine("pop dword eax");
result.AppendLine("mov [ebp+8], eax");
}
else if (retSize == 8)
{
result.AppendLine("pop dword eax");
result.AppendLine("mov [ebp+8], eax");
result.AppendLine("pop dword eax");
result.AppendLine("mov [ebp+12], eax");
}
else
{
throw new NotSupportedException("Return type size not supported / invalid!");
}
}
//Once return value is off the stack, remove the locals
//Deallocate stack space for locals
//Only bother if there are any locals
if (aScannerState.CurrentILChunk.LocalVariables.Count > 0)
{
//Get the total size of all locals
int totalBytes = 0;
foreach (StackItem aLocal in aScannerState.CurrentILChunk.LocalVariables)
{
totalBytes += aLocal.sizeOnStackInBytes;
}
//Move esp past the locals
result.AppendLine(string.Format("add esp, {0}", totalBytes));
}
//Restore ebp to previous method's ebp
result.AppendLine("pop dword ebp");
//This pop also takes last value off the stack which
//means top item is the return address
//So ret command can now be correctly executed.
return result.ToString().Trim();
}
/// <summary>
/// See base class documentation.
/// </summary>
/// <param name="anILOpInfo">See base class documentation.</param>
/// <param name="aScannerState">See base class documentation.</param>
/// <returns>See base class documentation.</returns>
public override string Convert(ILOpInfo anILOpInfo, ILScannerState aScannerState)
{
StringBuilder result = new StringBuilder();
MethodBase constructorMethod = anILOpInfo.MethodToCall;
Type objectType = constructorMethod.DeclaringType;
//New obj must:
// - Ignore for creation of Delegates
// - Allocate memory on the heap for the object
// - If no memory is left, throw a panic attack because we're out of memory...
// - Call the specified constructor
if (typeof(Delegate).IsAssignableFrom(objectType))
{
result.AppendLine("; Ignore newobj calls for Delegates");
//Still need to:
// - Remove the "object" param but preserve the "function pointer"
GlobalMethods.InsertPageFaultDetection(result, aScannerState, "esp", 0, (OpCodes)anILOpInfo.opCode.Value);
result.AppendLine("mov dword eax, [esp]");
GlobalMethods.InsertPageFaultDetection(result, aScannerState, "esp", 4, (OpCodes)anILOpInfo.opCode.Value);
result.AppendLine("mov dword [esp+4], eax");
result.AppendLine("add esp, 4");
return result.ToString().Trim();
}
//The label to jump to if allocated memory isn't null
//i.e. not out of memory.
string NotNullLabel = string.Format("{0}.IL_{1}_NotNullMem",
aScannerState.GetMethodID(aScannerState.CurrentILChunk.Method),
anILOpInfo.Position);
//Attempt to allocate memory on the heap for the new object
//This involves:
// - Pushing the type reference onto the stack
// - Calling GC NewObj method
// - Check the pointer == 0, if so, out of memory
//Push type reference
string typeIdStr = aScannerState.GetTypeIdString(aScannerState.GetTypeID(objectType));
result.AppendLine(string.Format("push dword {0}", typeIdStr));
//Push a dword for return value (i.e. new object pointer)
result.AppendLine("push dword 0");
//Get the GC.NewObj method ID (i.e. ASM label)
string methodLabel = aScannerState.GetMethodID(aScannerState.NewObjMethod);
//Call GC.NewObj
result.AppendLine(string.Format("call {0}", methodLabel));
//Pop the return value (i.e. new object pointer)
result.AppendLine("pop dword eax");
//Remove arg 0 from stack
result.AppendLine("add esp, 4");
//Check if pointer == 0?
result.AppendLine("cmp eax, 0");
//If it isn't 0, not out of memory so continue execution
result.AppendLine(string.Format("jnz {0}", NotNullLabel));
//If we are out of memory, we have a massive problem
//Because it means we don't have space to create a new exception object
//So ultimately we just have to throw a kernel panic
//Throw a panic attack... ( :/ ) by calling kernel Halt(uint lastAddress)
//result.AppendLine("call GetEIP");
//result.AppendLine("push dword esp");
//result.AppendLine("push dword ebp");
//result.AppendLine("pushad");
//result.AppendLine("mov dword eax, 0xDEADBEEF");
//result.AppendLine("mov dword ebx, 0x1");
//result.AppendLine("mov dword ecx, 1");
//result.AppendLine("mov dword [staticfield_System_Boolean_Kernel_FOS_System_GC_Enabled], 1");
//result.AppendLine("mov dword [staticfield_System_Boolean_Kernel_FOS_System_Heap_PreventAllocation], 0");
//result.AppendLine("jmp method_System_Void_RETEND_Kernel_PreReqs_DECLEND_PageFaultDetection_NAMEEND___Fail");
result.AppendLine("call GetEIP");
result.AppendLine(string.Format("call {0}", aScannerState.GetMethodID(aScannerState.HaltMethod)));
//Insert the not null label
result.AppendLine(NotNullLabel + ":");
//Call the specified constructor
//This involves:
// - Push empty dword onto stack
// - Move all args down by one dword
// - Move object reference into dword as first arg
// - Call constructor
result.AppendLine("push dword 0");
int sizeOfArgs = 0;
ParameterInfo[] allParams = constructorMethod.GetParameters();
foreach(ParameterInfo aParam in allParams)
{
sizeOfArgs += Utils.GetNumBytesForType(aParam.ParameterType);
aScannerState.CurrentStackFrame.Stack.Pop();
}
result.AppendLine("mov dword ebx, esp");
if (sizeOfArgs > 0)
{
if (sizeOfArgs % 4 != 0)
{
throw new InvalidOperationException("sizeOfArgs not exact multiple of 4!");
}
result.AppendLine(string.Format("mov dword ecx, {0}", sizeOfArgs / 4));
string ShiftArgsLoopLabel = string.Format("{0}.IL_{1}_ShiftArgsLoop",
aScannerState.GetMethodID(aScannerState.CurrentILChunk.Method),
anILOpInfo.Position);
result.AppendLine(ShiftArgsLoopLabel + ":");
GlobalMethods.InsertPageFaultDetection(result, aScannerState, "ebx", 4, (OpCodes)anILOpInfo.opCode.Value);
result.AppendLine("mov dword edx, [ebx+4]");
GlobalMethods.InsertPageFaultDetection(result, aScannerState, "ebx", 0, (OpCodes)anILOpInfo.opCode.Value);
result.AppendLine("mov dword [ebx], edx");
result.AppendLine("add ebx, 4");
result.AppendLine(string.Format("loop {0}", ShiftArgsLoopLabel));
}
GlobalMethods.InsertPageFaultDetection(result, aScannerState, "ebx", 0, (OpCodes)anILOpInfo.opCode.Value);
result.AppendLine("mov dword [ebx], eax");
result.AppendLine(string.Format("call {0}", aScannerState.GetMethodID(constructorMethod)));
//Only remove args from stack - we want the object pointer to remain on the stack
result.AppendLine(string.Format("add esp, {0}", sizeOfArgs));
aScannerState.CurrentStackFrame.Stack.Push(new StackItem()
{
isFloat = false,
sizeOnStackInBytes = 4,
isNewGCObject = true,
isGCManaged = true
});
return result.ToString().Trim();
}
