public static elf_note_file[] Parse(DwarfMemoryReader reader, bool is64bit)
{
ulong count = is64bit ? reader.ReadUlong() : reader.ReadUint();
ulong page_size = is64bit ? reader.ReadUlong() : reader.ReadUint();
elf_note_file[] files = new elf_note_file[count];
for (int i = 0; i < files.Length; i++)
{
files[i].start = is64bit ? reader.ReadUlong() : reader.ReadUint();
files[i].end = is64bit ? reader.ReadUlong() : reader.ReadUint();
files[i].file_ofs = (is64bit ? reader.ReadUlong() : reader.ReadUint()) * page_size;
}
for (int i = 0; i < files.Length; i++)
{
files[i].name = reader.ReadString();
}
return(files);
}
/// <summary>
/// Reads encoded address from the specified data memory reader.
/// </summary>
/// <param name="data">The data memory reader.</param>
/// <param name="encoding">Encoding used for storing address value.</param>
/// <param name="input">The input data for parsing configuration.</param>
/// <returns>Decoded address value.</returns>
private static ulong ReadEncodedAddress(DwarfMemoryReader data, DwarfExceptionHandlingEncoding encoding, DwarfExceptionHandlingFrameParsingInput input)
{
bool signExtendValue = false;
ulong baseAddress = 0;
switch (encoding & DwarfExceptionHandlingEncoding.Modifiers)
{
case DwarfExceptionHandlingEncoding.PcRelative:
signExtendValue = true;
baseAddress = (ulong)data.Position;
if (input.PcRelativeAddress != ulong.MaxValue)
{
baseAddress += input.PcRelativeAddress;
}
break;
case DwarfExceptionHandlingEncoding.TextRelative:
signExtendValue = true;
if (input.TextAddress != ulong.MaxValue)
{
baseAddress = input.TextAddress;
}
break;
case DwarfExceptionHandlingEncoding.DataRelative:
signExtendValue = true;
if (input.DataAddress != ulong.MaxValue)
{
baseAddress = input.DataAddress;
}
break;
case DwarfExceptionHandlingEncoding.FunctionRelative:
signExtendValue = true;
break;
case DwarfExceptionHandlingEncoding.Aligned:
{
int alignment = data.Position % input.DefaultAddressSize;
if (alignment > 0)
{
data.Position += input.DefaultAddressSize - alignment;
}
}
break;
}
ulong address = 0;
switch (encoding & DwarfExceptionHandlingEncoding.Mask)
{
case DwarfExceptionHandlingEncoding.Signed:
case DwarfExceptionHandlingEncoding.AbsolutePointer:
address = data.ReadUlong(input.DefaultAddressSize);
break;
case DwarfExceptionHandlingEncoding.UnsignedData2:
address = data.ReadUshort();
break;
case DwarfExceptionHandlingEncoding.UnsignedData4:
address = data.ReadUint();
break;
case DwarfExceptionHandlingEncoding.SignedData8:
case DwarfExceptionHandlingEncoding.UnsignedData8:
address = data.ReadUlong();
break;
case DwarfExceptionHandlingEncoding.Uleb128:
address = data.LEB128();
break;
case DwarfExceptionHandlingEncoding.Sleb128:
address = data.SLEB128();
break;
case DwarfExceptionHandlingEncoding.SignedData2:
address = (ulong)(long)(short)data.ReadUshort();
break;
case DwarfExceptionHandlingEncoding.SignedData4:
address = (ulong)(long)(int)data.ReadUint();
break;
}
if (signExtendValue && input.DefaultAddressSize < System.Runtime.InteropServices.Marshal.SizeOf(address.GetType()))
{
ulong sign_bit = 1UL << ((input.DefaultAddressSize * 8) - 1);
if ((sign_bit & address) != 0)
{
ulong mask = ~sign_bit + 1;
address |= mask;
}
}
return(baseAddress + address);
}
/// <summary>
/// Initializes a new instance of the <see cref="ElfCoreDump"/> class.
/// </summary>
/// <param name="coreDumpPath">The core dump path.</param>
public ElfCoreDump(string coreDumpPath)
{
elf = ELFReader.Load <ulong>(coreDumpPath);
if (elf.Type != FileType.Core)
{
throw new Exception($"Expected core dump, but got: {elf.Type}");
}
switch (elf.Machine)
{
case Machine.Intel386:
instance = new Intel386Instance(elf);
break;
case Machine.AMD64:
instance = new AMD64Instance(elf);
break;
default:
throw new Exception($"Unsupported machine type: {elf.Machine}");
}
Path = coreDumpPath;
foreach (var segment in elf.Segments)
{
if (segment.Type == SegmentType.Note)
{
using (DwarfMemoryReader reader = new DwarfMemoryReader(ReadSegment(segment)))
{
int noteStructSize = Marshal.SizeOf <elf_32note>();
while (reader.Position + noteStructSize < reader.Data.Length)
{
// Read note
elf_32note note = reader.ReadStructure <elf_32note>();
int nameEnd = reader.Position + (int)note.NameSize;
// Check if note is available to be read
if (nameEnd + note.n_descsz > reader.Data.Length)
{
break;
}
// Read name and content
string name = reader.ReadString();
reader.Position = nameEnd;
byte[] content = reader.ReadBlock(note.n_descsz);
instance.ProcessNote(name, content, note.n_type);
if (note.n_type == elf_note_type.File)
{
using (DwarfMemoryReader data = new DwarfMemoryReader(content))
{
files = elf_note_file.Parse(data, Is64bit);
}
}
else if (note.n_type == elf_note_type.Auxv)
{
using (DwarfMemoryReader data = new DwarfMemoryReader(content))
{
uint addressSize = elf.Class == Class.Bit32 ? 4U : 8U;
while (!data.IsEnd)
{
AuxvEntry entry = new AuxvEntry
{
Type = (AuxvEntryType)data.ReadUlong(addressSize),
Value = data.ReadUlong(addressSize)
};
if (entry.Type == AuxvEntryType.Null)
{
break;
}
if (entry.Type == AuxvEntryType.Ignore)
{
continue;
}
auxVector.Add(entry);
}
}
}
}
}
}
}
DumpFileMemoryReader = new CoreDumpReader(coreDumpPath, elf.Segments.Where(s => s.Type == SegmentType.Load));
}
/// <summary>
/// Reads the data for this instance.
/// </summary>
/// <param name="debugData">The debug data.</param>
/// <param name="debugDataDescription">The debug data description.</param>
/// <param name="debugStrings">The debug strings.</param>
/// <param name="addressNormalizer">Normalize address delegate (<see cref="NormalizeAddressDelegate"/>)</param>
private void ReadData(DwarfMemoryReader debugData, DwarfMemoryReader debugDataDescription, DwarfMemoryReader debugStrings, NormalizeAddressDelegate addressNormalizer)
{
// Read header
bool is64bit;
int beginPosition = debugData.Position;
ulong length = debugData.ReadLength(out is64bit);
int endPosition = debugData.Position + (int)length;
ushort version = debugData.ReadUshort();
int debugDataDescriptionOffset = debugData.ReadOffset(is64bit);
byte addressSize = debugData.ReadByte();
DataDescriptionReader dataDescriptionReader = new DataDescriptionReader(debugDataDescription, debugDataDescriptionOffset);
// Read data
List <DwarfSymbol> symbols = new List <DwarfSymbol>();
Stack <DwarfSymbol> parents = new Stack <DwarfSymbol>();
while (debugData.Position < endPosition)
{
int dataPosition = debugData.Position;
uint code = debugData.LEB128();
if (code == 0)
{
parents.Pop();
continue;
}
DataDescription description = dataDescriptionReader.GetDebugDataDescription(code);
Dictionary <DwarfAttribute, DwarfAttributeValue> attributes = new Dictionary <DwarfAttribute, DwarfAttributeValue>();
foreach (DataDescriptionAttribute descriptionAttribute in description.Attributes)
{
DwarfAttribute attribute = descriptionAttribute.Attribute;
DwarfFormat format = descriptionAttribute.Format;
DwarfAttributeValue attributeValue = new DwarfAttributeValue();
switch (format)
{
case DwarfFormat.Address:
attributeValue.Type = DwarfAttributeValueType.Address;
attributeValue.Value = debugData.ReadUlong(addressSize);
break;
case DwarfFormat.Block:
attributeValue.Type = DwarfAttributeValueType.Block;
attributeValue.Value = debugData.ReadBlock(debugData.LEB128());
break;
case DwarfFormat.Block1:
attributeValue.Type = DwarfAttributeValueType.Block;
attributeValue.Value = debugData.ReadBlock(debugData.ReadByte());
break;
case DwarfFormat.Block2:
attributeValue.Type = DwarfAttributeValueType.Block;
attributeValue.Value = debugData.ReadBlock(debugData.ReadUshort());
break;
case DwarfFormat.Block4:
attributeValue.Type = DwarfAttributeValueType.Block;
attributeValue.Value = debugData.ReadBlock(debugData.ReadUint());
break;
case DwarfFormat.Data1:
attributeValue.Type = DwarfAttributeValueType.Constant;
attributeValue.Value = (ulong)debugData.ReadByte();
break;
case DwarfFormat.Data2:
attributeValue.Type = DwarfAttributeValueType.Constant;
attributeValue.Value = (ulong)debugData.ReadUshort();
break;
case DwarfFormat.Data4:
attributeValue.Type = DwarfAttributeValueType.Constant;
attributeValue.Value = (ulong)debugData.ReadUint();
break;
case DwarfFormat.Data8:
attributeValue.Type = DwarfAttributeValueType.Constant;
attributeValue.Value = (ulong)debugData.ReadUlong();
break;
case DwarfFormat.SData:
attributeValue.Type = DwarfAttributeValueType.Constant;
attributeValue.Value = (ulong)debugData.SLEB128();
break;
case DwarfFormat.UData:
attributeValue.Type = DwarfAttributeValueType.Constant;
attributeValue.Value = (ulong)debugData.LEB128();
break;
case DwarfFormat.String:
attributeValue.Type = DwarfAttributeValueType.String;
attributeValue.Value = debugData.ReadString();
break;
case DwarfFormat.Strp:
attributeValue.Type = DwarfAttributeValueType.String;
attributeValue.Value = debugStrings.ReadString(debugData.ReadOffset(is64bit));
break;
case DwarfFormat.Flag:
attributeValue.Type = DwarfAttributeValueType.Flag;
attributeValue.Value = debugData.ReadByte() != 0;
break;
case DwarfFormat.FlagPresent:
attributeValue.Type = DwarfAttributeValueType.Flag;
attributeValue.Value = true;
break;
case DwarfFormat.Ref1:
attributeValue.Type = DwarfAttributeValueType.Reference;
attributeValue.Value = (ulong)debugData.ReadByte() + (ulong)beginPosition;
break;
case DwarfFormat.Ref2:
attributeValue.Type = DwarfAttributeValueType.Reference;
attributeValue.Value = (ulong)debugData.ReadUshort() + (ulong)beginPosition;
break;
case DwarfFormat.Ref4:
attributeValue.Type = DwarfAttributeValueType.Reference;
attributeValue.Value = (ulong)debugData.ReadUint() + (ulong)beginPosition;
break;
case DwarfFormat.Ref8:
attributeValue.Type = DwarfAttributeValueType.Reference;
attributeValue.Value = (ulong)debugData.ReadUlong() + (ulong)beginPosition;
break;
case DwarfFormat.RefUData:
attributeValue.Type = DwarfAttributeValueType.Reference;
attributeValue.Value = (ulong)debugData.LEB128() + (ulong)beginPosition;
break;
case DwarfFormat.RefAddr:
attributeValue.Type = DwarfAttributeValueType.Reference;
attributeValue.Value = (ulong)debugData.ReadOffset(is64bit);
break;
case DwarfFormat.RefSig8:
attributeValue.Type = DwarfAttributeValueType.Invalid;
debugData.Position += 8;
break;
case DwarfFormat.ExpressionLocation:
attributeValue.Type = DwarfAttributeValueType.ExpressionLocation;
attributeValue.Value = debugData.ReadBlock(debugData.LEB128());
break;
case DwarfFormat.SecOffset:
attributeValue.Type = DwarfAttributeValueType.SecOffset;
attributeValue.Value = (ulong)debugData.ReadOffset(is64bit);
break;
default:
throw new Exception($"Unsupported DwarfFormat: {format}");
}
if (attributes.ContainsKey(attribute))
{
if (attributes[attribute] != attributeValue)
{
attributes[attribute] = attributeValue;
}
}
else
{
attributes.Add(attribute, attributeValue);
}
}
DwarfSymbol symbol = new DwarfSymbol()
{
Tag = description.Tag,
Attributes = attributes,
Offset = dataPosition,
};
symbolsByOffset.Add(symbol.Offset, symbol);
if (parents.Count > 0)
{
parents.Peek().Children.Add(symbol);
symbol.Parent = parents.Peek();
}
else
{
symbols.Add(symbol);
}
if (description.HasChildren)
{
symbol.Children = new List <DwarfSymbol>();
parents.Push(symbol);
}
}
SymbolsTree = symbols.ToArray();
if (SymbolsTree.Length > 0)
{
// Add void type symbol
DwarfSymbol voidSymbol = new DwarfSymbol()
{
Tag = DwarfTag.BaseType,
Offset = -1,
Parent = SymbolsTree[0],
Attributes = new Dictionary <DwarfAttribute, DwarfAttributeValue>()
{
{ DwarfAttribute.Name, new DwarfAttributeValue()
{
Type = DwarfAttributeValueType.String, Value = "void"
} },
{ DwarfAttribute.ByteSize, new DwarfAttributeValue()
{
Type = DwarfAttributeValueType.Constant, Value = (ulong)0
} },
},
};
if (SymbolsTree[0].Children == null)
{
SymbolsTree[0].Children = new List <DwarfSymbol>();
}
SymbolsTree[0].Children.Insert(0, voidSymbol);
symbolsByOffset.Add(voidSymbol.Offset, voidSymbol);
// Post process all symbols
foreach (DwarfSymbol symbol in Symbols)
{
Dictionary <DwarfAttribute, DwarfAttributeValue> attributes = symbol.Attributes as Dictionary <DwarfAttribute, DwarfAttributeValue>;
foreach (DwarfAttributeValue value in attributes.Values)
{
if (value.Type == DwarfAttributeValueType.Reference)
{
DwarfSymbol reference;
if (symbolsByOffset.TryGetValue((int)value.Address, out reference))
{
value.Type = DwarfAttributeValueType.ResolvedReference;
value.Value = reference;
}
}
else if (value.Type == DwarfAttributeValueType.Address)
{
value.Value = addressNormalizer(value.Address);
}
}
if ((symbol.Tag == DwarfTag.PointerType && !attributes.ContainsKey(DwarfAttribute.Type)) ||
(symbol.Tag == DwarfTag.Typedef && !attributes.ContainsKey(DwarfAttribute.Type)))
{
attributes.Add(DwarfAttribute.Type, new DwarfAttributeValue()
{
Type = DwarfAttributeValueType.ResolvedReference,
Value = voidSymbol,
});
}
}
// Merge specifications
foreach (DwarfSymbol symbol in Symbols)
{
Dictionary <DwarfAttribute, DwarfAttributeValue> attributes = symbol.Attributes as Dictionary <DwarfAttribute, DwarfAttributeValue>;
DwarfAttributeValue specificationValue;
if (attributes.TryGetValue(DwarfAttribute.Specification, out specificationValue) && specificationValue.Type == DwarfAttributeValueType.ResolvedReference)
{
DwarfSymbol reference = specificationValue.Reference;
Dictionary <DwarfAttribute, DwarfAttributeValue> referenceAttributes = reference.Attributes as Dictionary <DwarfAttribute, DwarfAttributeValue>;
foreach (KeyValuePair <DwarfAttribute, DwarfAttributeValue> kvp in attributes)
{
if (kvp.Key != DwarfAttribute.Specification)
{
referenceAttributes[kvp.Key] = kvp.Value;
}
}
}
}
}
}
