private void LoadHeaders()
{
ImageData imageData = xexData;
xexData.header = rdr.ReadStruct <XexHeader>();
XexHeader header = xexData.header;
switch (header.magic)
{
case XEX2_MAGIC:
case XEX1_MAGIC:
break;
default:
throw new BadImageFormatException("Invalid XEX Magic");
}
for (uint i = 0; i < header.header_count; i++)
{
bool add = true;
XexOptionalHeader st_optionalHeader = rdr.ReadStruct <XexOptionalHeader>();
OptionalHeader optionalHeader = new OptionalHeader(st_optionalHeader);
switch ((byte)optionalHeader.key)
{
// just the data
case 0x00:
case 0x01:
optionalHeader.value = optionalHeader.offset;
optionalHeader.offset = 0;
break;
case 0xFF:
optionalHeader.length = rdr.ReadAt <UInt32>(optionalHeader.offset, (r) =>
{
return(r.ReadUInt32());
});
optionalHeader.offset += 4;
if (optionalHeader.length + optionalHeader.offset > rdr.Bytes.Length)
{
decompilerEventListener.Warn(
new NullCodeLocation(""),
$"Optional header {i} (0x{optionalHeader.key:X}) crosses file boundary. Will not be read"
);
add = false;
}
break;
default:
optionalHeader.length = ((uint)(byte)optionalHeader.key) * 4;
if (optionalHeader.length + optionalHeader.offset > rdr.Bytes.Length)
{
decompilerEventListener.Warn(
new NullCodeLocation(""),
$"Optional header {i} (0x{optionalHeader.key:X}) crosses file boundary. Will not be read"
);
add = false;
}
break;
}
if (add)
{
optional_headers.Add(optionalHeader);
}
}
for (int i = 0; i < optional_headers.Count; i++)
{
OptionalHeader opt = optional_headers[i];
// go to the header offset
if (opt.length > 0 && opt.offset != 0)
{
rdr.Offset = opt.offset;
}
// process the optional headers
switch (opt.key)
{
case XEXHeaderKeys.XEX_HEADER_SYSTEM_FLAGS:
imageData.system_flags = (XEXSystemFlags)opt.value;
break;
case XEXHeaderKeys.XEX_HEADER_RESOURCE_INFO:
uint count = (opt.length - 4) / 16;
xexData.resources = new List <XexResourceInfo>((int)count);
for (uint n = 0; n < count; n++)
{
xexData.resources.Insert(i, rdr.ReadStruct <XexResourceInfo>());
}
break;
case XEXHeaderKeys.XEX_HEADER_EXECUTION_INFO:
imageData.execution_info = rdr.ReadStruct <XexExecutionInfo>();
break;
case XEXHeaderKeys.XEX_HEADER_GAME_RATINGS:
break;
case XEXHeaderKeys.XEX_HEADER_TLS_INFO:
imageData.tls_info = rdr.ReadStruct <XexTlsInfo>();
break;
case XEXHeaderKeys.XEX_HEADER_IMAGE_BASE_ADDRESS:
imageData.exe_address = opt.value;
break;
case XEXHeaderKeys.XEX_HEADER_ENTRY_POINT:
imageData.exe_entry_point = opt.value;
break;
case XEXHeaderKeys.XEX_HEADER_DEFAULT_STACK_SIZE:
imageData.exe_stack_size = opt.value;
break;
case XEXHeaderKeys.XEX_HEADER_DEFAULT_HEAP_SIZE:
imageData.exe_heap_size = opt.value;
break;
case XEXHeaderKeys.XEX_HEADER_FILE_FORMAT_INFO:
XexEncryptionHeader encHeader = rdr.ReadStruct <XexEncryptionHeader>();
imageData.file_format_info.encryption_type = encHeader.encryption_type;
imageData.file_format_info.compression_type = encHeader.compression_type;
switch (encHeader.compression_type)
{
case XEXCompressionType.XEX_COMPRESSION_NONE:
break;
case XEXCompressionType.XEX_COMPRESSION_DELTA:
throw new NotImplementedException("XEX: image::Binary is using unsupported delta compression");
case XEXCompressionType.XEX_COMPRESSION_BASIC:
uint block_count = (opt.length - 8) / 8;
imageData.file_format_info.basic_blocks = new List <XexFileBasicCompressionBlock>((int)block_count);
for (int ib = 0; ib < block_count; ib++)
{
imageData.file_format_info.basic_blocks.Insert(ib, rdr.ReadStruct <XexFileBasicCompressionBlock>());
}
break;
case XEXCompressionType.XEX_COMPRESSION_NORMAL:
imageData.file_format_info.normal = rdr.ReadStruct <XexFileNormalCompressionInfo>();
break;
}
if (encHeader.encryption_type != XEXEncryptionType.XEX_ENCRYPTION_NONE)
{
//
}
break;
case XEXHeaderKeys.XEX_HEADER_IMPORT_LIBRARIES:
XexImportLibraryBlockHeader blockHeader = rdr.ReadStruct <XexImportLibraryBlockHeader>();
long string_table = rdr.Offset;
for (int j = 0; j < blockHeader.count; j++)
{
string name = rdr.ReadCString(PrimitiveType.Char, Encoding.ASCII).ToString();
imageData.libNames.Add(name);
}
rdr.Offset = string_table + blockHeader.string_table_size;
for (int m = 0; m < blockHeader.count; m++)
{
XexImportLibaryHeader imp_header = rdr.ReadStruct <XexImportLibaryHeader>();
string name = null;
int name_index = (byte)imp_header.name_index;
if (name_index < blockHeader.count)
{
name = imageData.libNames[name_index];
}
for (uint ri = 0; ri < imp_header.record_count; ++ri)
{
UInt32 recordEntry = rdr.ReadUInt32();
xexData.import_records.Add(recordEntry);
}
}
break;
}
}
// load the loader info
{
rdr.Offset = header.security_offset;
switch (header.magic)
{
case XEX1_MAGIC:
Xex1LoaderInfo info1 = rdr.ReadStruct <Xex1LoaderInfo>();
xexData.loader_info.aes_key = info1.aes_key;
break;
case XEX2_MAGIC:
Xex2LoaderInfo info2 = rdr.ReadStruct <Xex2LoaderInfo>();
xexData.loader_info.aes_key = info2.aes_key;
break;
}
}
// load the sections
{
rdr.Offset = header.security_offset + 0x180;
UInt32 sectionCount = rdr.ReadUInt32();
xexData.sections = new List <XexSection>((int)sectionCount);
for (int si = 0; si < sectionCount; si++)
{
xexData.sections.Insert(0, rdr.ReadStruct <XexSection>());
}
}
// decrypt the XEX key
{
byte[] keyToUse = xe_xex2_devkit_key;
if (header.magic != XEX1_MAGIC && xexData.execution_info.title_id != 0)
{
keyToUse = xe_xex2_retail_key;
}
Rijndael aes = new RijndaelManaged()
{
BlockSize = 128,
KeySize = 128,
Mode = CipherMode.ECB,
Key = keyToUse,
Padding = PaddingMode.None
};
xexData.session_key = aes
.CreateDecryptor()
.TransformFinalBlock(xexData.loader_info.aes_key, 0, 16);
decompilerEventListener.Info(
new NullCodeLocation(""),
"XEX Session key: " + BitConverter.ToString(xexData.session_key).Replace("-", "")
);
}
}
private void LoadPEImage()
{
long fileDataSize = rdr.Bytes.Length - xexData.header.header_size;
BeImageReader memRdr = new BeImageReader(xexData.memoryData);
DOSHeader dosHeader = memRdr.ReadStruct <DOSHeader>();
dosHeader.Validate();
memRdr.Offset = dosHeader.e_lfanew;
UInt32 peSignature = memRdr.ReadUInt32();
if (peSignature != 0x50450000)
{
throw new BadImageFormatException("PE: Invalid or Missing PE Signature");
}
COFFHeader coffHeader = memRdr.ReadStruct <COFFHeader>();
if (coffHeader.Machine != 0x1F2)
{
throw new BadImageFormatException($"PE: Machine type does not match Xbox360 (found 0x{coffHeader.Machine:X})");
}
if ((coffHeader.Characteristics & 0x0100) == 0)
{
throw new BadImageFormatException("PE: Only 32-bit images are supported");
}
if (coffHeader.SizeOfOptionalHeader != 224)
{
throw new BadImageFormatException($"PE: Invalid size of optional header (got {coffHeader.SizeOfOptionalHeader}");
}
PEOptHeader optHeader = memRdr.ReadStruct <PEOptHeader>();
if (optHeader.signature != 0x10b)
{
throw new BadImageFormatException($"PE: Invalid signature of optional header (got 0x{optHeader.signature})");
}
if (optHeader.Subsystem != IMAGE_SUBSYSTEM_XBOX)
{
throw new BadImageFormatException($"PE: Invalid subsystem (got {optHeader.Subsystem})");
}
xexData.peHeader = optHeader;
uint extendedMemorySize = 0;
uint numSections = coffHeader.NumberOfSections;
List <PESection> peSections = new List <PESection>();
for (uint i = 0; i < numSections; i++)
{
COFFSection section = memRdr.ReadStruct <COFFSection>();
string sectionName = Encoding.ASCII.GetString(section.Name).Trim('\0');
uint lastMemoryAddress = section.VirtualAddress + section.VirtualSize;
if (lastMemoryAddress > extendedMemorySize)
{
extendedMemorySize = lastMemoryAddress;
}
if (section.SizeOfRawData == 0)
{
decompilerEventListener.Info(new NullCodeLocation(""),
$"Skipping empty section {sectionName}"
);
continue;
}
byte[] sectionData = memRdr.ReadAt <byte[]>(section.PointerToRawData, rdr => rdr.ReadBytes(section.SizeOfRawData));
AccessMode acc = AccessMode.Read;
if (section.Flags.HasFlag(PESectionFlags.IMAGE_SCN_MEM_WRITE))
{
acc |= AccessMode.Write;
}
if (section.Flags.HasFlag(PESectionFlags.IMAGE_SCN_MEM_EXECUTE))
{
acc |= AccessMode.Execute;
}
PESection managedSection = new PESection(section);
peSections.Add(managedSection);
ImageSegment seg = new ImageSegment(sectionName, new MemoryArea(
new Address32(managedSection.PhysicalOffset + xexData.exe_address), sectionData
), acc);
segments.Add(seg);
}
if (extendedMemorySize > xexData.memorySize)
{
decompilerEventListener.Info(new NullCodeLocation(""),
$"PE: Image sections extend beyond virtual memory range loaded from file ({extendedMemorySize} > {xexData.memorySize}). Extending by {extendedMemorySize - xexData.memorySize} bytes."
);
UInt32 oldMemorySize = xexData.memorySize;
byte[] newMemoryData = new byte[extendedMemorySize];
Array.Copy(xexData.memoryData, newMemoryData, xexData.memorySize);
xexData.memorySize = extendedMemorySize;
xexData.memoryData = newMemoryData;
for (int i = 0; i < peSections.Count; i++)
{
PESection section = peSections[i];
if (section.PhysicalSize == 0)
{
continue;
}
if (section.PhysicalSize + section.PhysicalOffset > fileDataSize)
{
decompilerEventListener.Warn(new NullCodeLocation(""),
$"PE: Section '{section.Name}' lies outside any phyisical data we have {section.PhysicalOffset} (size {section.PhysicalSize})"
);
continue;
}
if (section.VirtualOffset >= oldMemorySize)
{
uint sizeToCopy = section.PhysicalSize;
if (section.VirtualSize < sizeToCopy)
{
sizeToCopy = section.VirtualSize;
}
Array.Copy(
xexData.memoryData, section.PhysicalOffset,
newMemoryData, section.VirtualOffset,
sizeToCopy);
}
}
}
}