label creation

CodeVirtualizer/Code.h

@@ -2,5 +2,6 @@
 #define __CODE_H
 
 #define CODE_FLAG_IS_LABEL		(1<<0)
+#define CODE_FLAG_IS_REL_JMP	(1<<1)
 
 #endif

CodeVirtualizer/NativeCode.cpp

@@ -94,7 +94,7 @@ BOOL NcCreateLabels(PNATIVE_CODE_BLOCK Block)
 		XED_OPERAND_TYPE_ENUM OperandType = XedOperandType(Operand);
 		if (OperandType != XED_OPERAND_TYPE_IMM && OperandType != XED_OPERAND_TYPE_IMM_CONST)
 		{
-			printf("Found jump to non immediate value. Cat: %s\n", XedCategoryEnumToString(Category));
+			printf("Found jump to non immediate value. Category: %s\n", XedCategoryEnumToString(Category));
 			continue;
 		}
 
@@ -112,21 +112,53 @@ BOOL NcCreateLabels(PNATIVE_CODE_BLOCK Block)
 		}
 		else
 		{
-			NcInsertLinkBefore(JmpPos, new NATIVE_CODE_LINK(CurrentLabelId++));
+			NcInsertLinkBefore(JmpPos, new NATIVE_CODE_LINK(CurrentLabelId));
+			T->Label = CurrentLabelId;
+			++CurrentLabelId;
 		}
+		T->Flags |= CODE_FLAG_IS_REL_JMP;
 	}
 }
 
 PNATIVE_CODE_LINK NcValidateJmp(PNATIVE_CODE_LINK Jmp, INT32 Delta)
 {
-	if (Delta < 0)
+	PNATIVE_CODE_LINK T;
+	if (Delta > 0)
 	{
-		
+		T = Jmp->Next;
+		while (Delta > 0 && T)
+		{
+			if (T->Flags & CODE_FLAG_IS_LABEL)
+				continue;
+			Delta -= XedDecodedInstGetLength(&T->XedInst);
+			T = T->Next;
 		}
-	else if (Delta > 0)
+		if (Delta != 0 || !T)
+			return NULL;
+		while (T && (T->Flags & CODE_FLAG_IS_LABEL))
+			T = T->Next;
+		return T;
+	}
+	else if (Delta < 0)
 	{
-
+		T = Jmp;
+		while (T)
+		{
+			if (T->Flags & CODE_FLAG_IS_LABEL)
+				continue;
+			Delta += XedDecodedInstGetLength(&T->XedInst);
+			if (Delta >= 0)
+				break;
+			T = T->Next;
 		}
+		if (Delta != 0 || !T)
+			return NULL;
+		while (T && (T->Flags & CODE_FLAG_IS_LABEL))
+			T = T->Next;
+		return T;
+	}
+	//return the jmp if that delta is zero
+	return Jmp;
 }
 
 BOOL NcFromBuffer(PNATIVE_CODE_BLOCK Block, PVOID Buffer, ULONG BufferSize)
@@ -160,6 +192,8 @@ BOOL NcFromBuffer(PNATIVE_CODE_BLOCK Block, PVOID Buffer, ULONG BufferSize)
 	Block->Start = Block->Start->Next;
 	delete StartLink;
 
+	NcCreateLabels(Block);
+
 	return TRUE;
 }
 

CodeVirtualizer/NativeCode.h

@@ -23,7 +23,7 @@ typedef struct _NATIVE_CODE_BLOCK
 {
 	PNATIVE_CODE_LINK Start;
 	PNATIVE_CODE_LINK End;
-}NATIVE_CODE_BLOCK, * PNATIVE_CODE_BLOCK;
+}NATIVE_CODE_BLOCK, *PNATIVE_CODE_BLOCK;
 
 VOID NcInsertLinkAfter(PNATIVE_CODE_LINK Link1, PNATIVE_CODE_LINK Link2);
 

CodeVirtualizer/VmCode.cpp

@@ -1 +1,17 @@
 #include "VmCode.h"
+
+_VM_CODE_LINK::_VM_CODE_LINK()
+{
+	Flags = 0;
+	Next = Prev = NULL;
+	Label = 0;
+	RawData = NULL;
+	RawDataSize = 0UL;
+}
+
+_VM_CODE_LINK::_VM_CODE_LINK(ULONG LabelId)
+	: _VM_CODE_LINK()
+{
+	Label = LabelId;
+	Flags = CODE_FLAG_IS_LABEL;
+}

CodeVirtualizer/VmCode.h

@@ -2,7 +2,26 @@
 #define __VM_CODE_H
 
 #include "Windas.h"
+#include "Code.h"
 
+typedef struct _VM_CODE_LINK
+{
+	_VM_CODE_LINK*	Next;
+	_VM_CODE_LINK*	Prev;
 
+	ULONG			Flags;
+	ULONG			Label;
+	PUCHAR			RawData;
+	ULONG			RawDataSize;
+
+	_VM_CODE_LINK();
+	_VM_CODE_LINK(ULONG LabelId);
+}VM_CODE_LINK, *PVM_CODE_LINK;
+
+typedef struct _VM_CODE_BLOCK
+{
+	PVM_CODE_LINK Start;
+	PVM_CODE_LINK End;
+}VM_CODE_BLOCK, *PVM_CODE_BLOCK;
 
 #endif

CodeVirtualizer/XedWrap.h

@@ -19,9 +19,10 @@ VOID InitXed();
 #define XED_ERROR_ENUM xed_error_enum_t
 #define XED_CATEGORY_ENUM xed_category_enum_t
 
+#define XedDecode xed_decode
+
 #define XedDecodedInstZero xed_decoded_inst_zero
 #define XedDecodedInstSetMode xed_decoded_inst_set_mode
-#define XedDecode xed_decode
 #define XedDecodedInstGetLength xed_decoded_inst_get_length
 #define XedDecodedInstGetCategory xed_decoded_inst_get_category
 #define XedDecodedInstGetBranchDisplacementWidth xed_decoded_inst_get_branch_displacement_width