mirror of
https://github.com/RPCS3/llvm.git
synced 2024-12-03 17:32:59 +00:00
23dcd00ede
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122053 91177308-0d34-0410-b5e6-96231b3b80d8
343 lines
11 KiB
C++
343 lines
11 KiB
C++
//===- MachOObject.cpp - Mach-O Object File Wrapper -----------------------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "llvm/Object/MachOObject.h"
|
|
#include "llvm/ADT/StringRef.h"
|
|
#include "llvm/Support/MemoryBuffer.h"
|
|
#include "llvm/Support/Host.h"
|
|
#include "llvm/Support/SwapByteOrder.h"
|
|
|
|
using namespace llvm;
|
|
using namespace llvm::object;
|
|
|
|
/* Translation Utilities */
|
|
|
|
template<typename T>
|
|
static void SwapValue(T &Value) {
|
|
Value = sys::SwapByteOrder(Value);
|
|
}
|
|
|
|
template<typename T>
|
|
static void SwapStruct(T &Value);
|
|
|
|
template<typename T>
|
|
static void ReadInMemoryStruct(const MachOObject &MOO,
|
|
StringRef Buffer, uint64_t Base,
|
|
InMemoryStruct<T> &Res) {
|
|
typedef T struct_type;
|
|
uint64_t Size = sizeof(struct_type);
|
|
|
|
// Check that the buffer contains the expected data.
|
|
if (Base + Size > Buffer.size()) {
|
|
Res = 0;
|
|
return;
|
|
}
|
|
|
|
// Check whether we can return a direct pointer.
|
|
struct_type *Ptr = (struct_type *) (Buffer.data() + Base);
|
|
if (!MOO.isSwappedEndian()) {
|
|
Res = Ptr;
|
|
return;
|
|
}
|
|
|
|
// Otherwise, copy the struct and translate the values.
|
|
Res = *Ptr;
|
|
SwapStruct(*Res);
|
|
}
|
|
|
|
/* *** */
|
|
|
|
MachOObject::MachOObject(MemoryBuffer *Buffer_, bool IsLittleEndian_,
|
|
bool Is64Bit_)
|
|
: Buffer(Buffer_), IsLittleEndian(IsLittleEndian_), Is64Bit(Is64Bit_),
|
|
IsSwappedEndian(IsLittleEndian != sys::isLittleEndianHost()),
|
|
HasStringTable(false), LoadCommands(0), NumLoadedCommands(0) {
|
|
// Load the common header.
|
|
memcpy(&Header, Buffer->getBuffer().data(), sizeof(Header));
|
|
if (IsSwappedEndian) {
|
|
SwapValue(Header.Magic);
|
|
SwapValue(Header.CPUType);
|
|
SwapValue(Header.CPUSubtype);
|
|
SwapValue(Header.FileType);
|
|
SwapValue(Header.NumLoadCommands);
|
|
SwapValue(Header.SizeOfLoadCommands);
|
|
SwapValue(Header.Flags);
|
|
}
|
|
|
|
if (is64Bit()) {
|
|
memcpy(&Header64Ext, Buffer->getBuffer().data() + sizeof(Header),
|
|
sizeof(Header64Ext));
|
|
if (IsSwappedEndian) {
|
|
SwapValue(Header64Ext.Reserved);
|
|
}
|
|
}
|
|
|
|
// Create the load command array if sane.
|
|
if (getHeader().NumLoadCommands < (1 << 20))
|
|
LoadCommands = new LoadCommandInfo[getHeader().NumLoadCommands];
|
|
}
|
|
|
|
MachOObject::~MachOObject() {
|
|
delete [] LoadCommands;
|
|
}
|
|
|
|
MachOObject *MachOObject::LoadFromBuffer(MemoryBuffer *Buffer,
|
|
std::string *ErrorStr) {
|
|
// First, check the magic value and initialize the basic object info.
|
|
bool IsLittleEndian = false, Is64Bit = false;
|
|
StringRef Magic = Buffer->getBuffer().slice(0, 4);
|
|
if (Magic == "\xFE\xED\xFA\xCE") {
|
|
} else if (Magic == "\xCE\xFA\xED\xFE") {
|
|
IsLittleEndian = true;
|
|
} else if (Magic == "\xFE\xED\xFA\xCF") {
|
|
Is64Bit = true;
|
|
} else if (Magic == "\xCF\xFA\xED\xFE") {
|
|
IsLittleEndian = true;
|
|
Is64Bit = true;
|
|
} else {
|
|
if (ErrorStr) *ErrorStr = "not a Mach object file (invalid magic)";
|
|
return 0;
|
|
}
|
|
|
|
// Ensure that the at least the full header is present.
|
|
unsigned HeaderSize = Is64Bit ? macho::Header64Size : macho::Header32Size;
|
|
if (Buffer->getBufferSize() < HeaderSize) {
|
|
if (ErrorStr) *ErrorStr = "not a Mach object file (invalid header)";
|
|
return 0;
|
|
}
|
|
|
|
OwningPtr<MachOObject> Object(new MachOObject(Buffer, IsLittleEndian,
|
|
Is64Bit));
|
|
|
|
// Check for bogus number of load commands.
|
|
if (Object->getHeader().NumLoadCommands >= (1 << 20)) {
|
|
if (ErrorStr) *ErrorStr = "not a Mach object file (unreasonable header)";
|
|
return 0;
|
|
}
|
|
|
|
if (ErrorStr) *ErrorStr = "";
|
|
return Object.take();
|
|
}
|
|
|
|
StringRef MachOObject::getData(size_t Offset, size_t Size) const {
|
|
return Buffer->getBuffer().substr(Offset,Size);
|
|
}
|
|
|
|
void MachOObject::RegisterStringTable(macho::SymtabLoadCommand &SLC) {
|
|
HasStringTable = true;
|
|
StringTable = Buffer->getBuffer().substr(SLC.StringTableOffset,
|
|
SLC.StringTableSize);
|
|
}
|
|
|
|
const MachOObject::LoadCommandInfo &
|
|
MachOObject::getLoadCommandInfo(unsigned Index) const {
|
|
assert(Index < getHeader().NumLoadCommands && "Invalid index!");
|
|
|
|
// Load the command, if necessary.
|
|
if (Index >= NumLoadedCommands) {
|
|
uint64_t Offset;
|
|
if (Index == 0) {
|
|
Offset = getHeaderSize();
|
|
} else {
|
|
const LoadCommandInfo &Prev = getLoadCommandInfo(Index - 1);
|
|
Offset = Prev.Offset + Prev.Command.Size;
|
|
}
|
|
|
|
LoadCommandInfo &Info = LoadCommands[Index];
|
|
memcpy(&Info.Command, Buffer->getBuffer().data() + Offset,
|
|
sizeof(macho::LoadCommand));
|
|
if (IsSwappedEndian) {
|
|
SwapValue(Info.Command.Type);
|
|
SwapValue(Info.Command.Size);
|
|
}
|
|
Info.Offset = Offset;
|
|
NumLoadedCommands = Index + 1;
|
|
}
|
|
|
|
return LoadCommands[Index];
|
|
}
|
|
|
|
template<>
|
|
void SwapStruct(macho::SegmentLoadCommand &Value) {
|
|
SwapValue(Value.Type);
|
|
SwapValue(Value.Size);
|
|
SwapValue(Value.VMAddress);
|
|
SwapValue(Value.VMSize);
|
|
SwapValue(Value.FileOffset);
|
|
SwapValue(Value.FileSize);
|
|
SwapValue(Value.MaxVMProtection);
|
|
SwapValue(Value.InitialVMProtection);
|
|
SwapValue(Value.NumSections);
|
|
SwapValue(Value.Flags);
|
|
}
|
|
void MachOObject::ReadSegmentLoadCommand(const LoadCommandInfo &LCI,
|
|
InMemoryStruct<macho::SegmentLoadCommand> &Res) const {
|
|
ReadInMemoryStruct(*this, Buffer->getBuffer(), LCI.Offset, Res);
|
|
}
|
|
|
|
template<>
|
|
void SwapStruct(macho::Segment64LoadCommand &Value) {
|
|
SwapValue(Value.Type);
|
|
SwapValue(Value.Size);
|
|
SwapValue(Value.VMAddress);
|
|
SwapValue(Value.VMSize);
|
|
SwapValue(Value.FileOffset);
|
|
SwapValue(Value.FileSize);
|
|
SwapValue(Value.MaxVMProtection);
|
|
SwapValue(Value.InitialVMProtection);
|
|
SwapValue(Value.NumSections);
|
|
SwapValue(Value.Flags);
|
|
}
|
|
void MachOObject::ReadSegment64LoadCommand(const LoadCommandInfo &LCI,
|
|
InMemoryStruct<macho::Segment64LoadCommand> &Res) const {
|
|
ReadInMemoryStruct(*this, Buffer->getBuffer(), LCI.Offset, Res);
|
|
}
|
|
|
|
template<>
|
|
void SwapStruct(macho::SymtabLoadCommand &Value) {
|
|
SwapValue(Value.Type);
|
|
SwapValue(Value.Size);
|
|
SwapValue(Value.SymbolTableOffset);
|
|
SwapValue(Value.NumSymbolTableEntries);
|
|
SwapValue(Value.StringTableOffset);
|
|
SwapValue(Value.StringTableSize);
|
|
}
|
|
void MachOObject::ReadSymtabLoadCommand(const LoadCommandInfo &LCI,
|
|
InMemoryStruct<macho::SymtabLoadCommand> &Res) const {
|
|
ReadInMemoryStruct(*this, Buffer->getBuffer(), LCI.Offset, Res);
|
|
}
|
|
|
|
template<>
|
|
void SwapStruct(macho::DysymtabLoadCommand &Value) {
|
|
SwapValue(Value.Type);
|
|
SwapValue(Value.Size);
|
|
SwapValue(Value.LocalSymbolsIndex);
|
|
SwapValue(Value.NumLocalSymbols);
|
|
SwapValue(Value.ExternalSymbolsIndex);
|
|
SwapValue(Value.NumExternalSymbols);
|
|
SwapValue(Value.UndefinedSymbolsIndex);
|
|
SwapValue(Value.NumUndefinedSymbols);
|
|
SwapValue(Value.TOCOffset);
|
|
SwapValue(Value.NumTOCEntries);
|
|
SwapValue(Value.ModuleTableOffset);
|
|
SwapValue(Value.NumModuleTableEntries);
|
|
SwapValue(Value.ReferenceSymbolTableOffset);
|
|
SwapValue(Value.NumReferencedSymbolTableEntries);
|
|
SwapValue(Value.IndirectSymbolTableOffset);
|
|
SwapValue(Value.NumIndirectSymbolTableEntries);
|
|
SwapValue(Value.ExternalRelocationTableOffset);
|
|
SwapValue(Value.NumExternalRelocationTableEntries);
|
|
SwapValue(Value.LocalRelocationTableOffset);
|
|
SwapValue(Value.NumLocalRelocationTableEntries);
|
|
}
|
|
void MachOObject::ReadDysymtabLoadCommand(const LoadCommandInfo &LCI,
|
|
InMemoryStruct<macho::DysymtabLoadCommand> &Res) const {
|
|
ReadInMemoryStruct(*this, Buffer->getBuffer(), LCI.Offset, Res);
|
|
}
|
|
|
|
template<>
|
|
void SwapStruct(macho::IndirectSymbolTableEntry &Value) {
|
|
SwapValue(Value.Index);
|
|
}
|
|
void
|
|
MachOObject::ReadIndirectSymbolTableEntry(const macho::DysymtabLoadCommand &DLC,
|
|
unsigned Index,
|
|
InMemoryStruct<macho::IndirectSymbolTableEntry> &Res) const {
|
|
uint64_t Offset = (DLC.IndirectSymbolTableOffset +
|
|
Index * sizeof(macho::IndirectSymbolTableEntry));
|
|
ReadInMemoryStruct(*this, Buffer->getBuffer(), Offset, Res);
|
|
}
|
|
|
|
|
|
template<>
|
|
void SwapStruct(macho::Section &Value) {
|
|
SwapValue(Value.Address);
|
|
SwapValue(Value.Size);
|
|
SwapValue(Value.Offset);
|
|
SwapValue(Value.Align);
|
|
SwapValue(Value.RelocationTableOffset);
|
|
SwapValue(Value.NumRelocationTableEntries);
|
|
SwapValue(Value.Flags);
|
|
SwapValue(Value.Reserved1);
|
|
SwapValue(Value.Reserved2);
|
|
}
|
|
void MachOObject::ReadSection(const LoadCommandInfo &LCI,
|
|
unsigned Index,
|
|
InMemoryStruct<macho::Section> &Res) const {
|
|
assert(LCI.Command.Type == macho::LCT_Segment &&
|
|
"Unexpected load command info!");
|
|
uint64_t Offset = (LCI.Offset + sizeof(macho::SegmentLoadCommand) +
|
|
Index * sizeof(macho::Section));
|
|
ReadInMemoryStruct(*this, Buffer->getBuffer(), Offset, Res);
|
|
}
|
|
|
|
template<>
|
|
void SwapStruct(macho::Section64 &Value) {
|
|
SwapValue(Value.Address);
|
|
SwapValue(Value.Size);
|
|
SwapValue(Value.Offset);
|
|
SwapValue(Value.Align);
|
|
SwapValue(Value.RelocationTableOffset);
|
|
SwapValue(Value.NumRelocationTableEntries);
|
|
SwapValue(Value.Flags);
|
|
SwapValue(Value.Reserved1);
|
|
SwapValue(Value.Reserved2);
|
|
SwapValue(Value.Reserved3);
|
|
}
|
|
void MachOObject::ReadSection64(const LoadCommandInfo &LCI,
|
|
unsigned Index,
|
|
InMemoryStruct<macho::Section64> &Res) const {
|
|
assert(LCI.Command.Type == macho::LCT_Segment64 &&
|
|
"Unexpected load command info!");
|
|
uint64_t Offset = (LCI.Offset + sizeof(macho::Segment64LoadCommand) +
|
|
Index * sizeof(macho::Section64));
|
|
ReadInMemoryStruct(*this, Buffer->getBuffer(), Offset, Res);
|
|
}
|
|
|
|
template<>
|
|
void SwapStruct(macho::RelocationEntry &Value) {
|
|
SwapValue(Value.Word0);
|
|
SwapValue(Value.Word1);
|
|
}
|
|
void MachOObject::ReadRelocationEntry(uint64_t RelocationTableOffset,
|
|
unsigned Index,
|
|
InMemoryStruct<macho::RelocationEntry> &Res) const {
|
|
uint64_t Offset = (RelocationTableOffset +
|
|
Index * sizeof(macho::RelocationEntry));
|
|
ReadInMemoryStruct(*this, Buffer->getBuffer(), Offset, Res);
|
|
}
|
|
|
|
template<>
|
|
void SwapStruct(macho::SymbolTableEntry &Value) {
|
|
SwapValue(Value.StringIndex);
|
|
SwapValue(Value.Flags);
|
|
SwapValue(Value.Value);
|
|
}
|
|
void MachOObject::ReadSymbolTableEntry(uint64_t SymbolTableOffset,
|
|
unsigned Index,
|
|
InMemoryStruct<macho::SymbolTableEntry> &Res) const {
|
|
uint64_t Offset = (SymbolTableOffset +
|
|
Index * sizeof(macho::SymbolTableEntry));
|
|
ReadInMemoryStruct(*this, Buffer->getBuffer(), Offset, Res);
|
|
}
|
|
|
|
template<>
|
|
void SwapStruct(macho::Symbol64TableEntry &Value) {
|
|
SwapValue(Value.StringIndex);
|
|
SwapValue(Value.Flags);
|
|
SwapValue(Value.Value);
|
|
}
|
|
void MachOObject::ReadSymbol64TableEntry(uint64_t SymbolTableOffset,
|
|
unsigned Index,
|
|
InMemoryStruct<macho::Symbol64TableEntry> &Res) const {
|
|
uint64_t Offset = (SymbolTableOffset +
|
|
Index * sizeof(macho::Symbol64TableEntry));
|
|
ReadInMemoryStruct(*this, Buffer->getBuffer(), Offset, Res);
|
|
}
|