229 lines
8.9 KiB
C++
229 lines
8.9 KiB
C++
//===- MachOUniversal.cpp - Mach-O universal binary -------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines the MachOUniversalBinary class.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Object/MachOUniversal.h"
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#include "llvm/Object/Archive.h"
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#include "llvm/Object/MachO.h"
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#include "llvm/Object/ObjectFile.h"
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#include "llvm/Support/Casting.h"
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#include "llvm/Support/Host.h"
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#include "llvm/Support/MemoryBuffer.h"
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using namespace llvm;
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using namespace object;
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static Error
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malformedError(Twine Msg) {
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std::string StringMsg = "truncated or malformed fat file (" + Msg.str() + ")";
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return make_error<GenericBinaryError>(std::move(StringMsg),
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object_error::parse_failed);
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}
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template<typename T>
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static T getUniversalBinaryStruct(const char *Ptr) {
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T Res;
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memcpy(&Res, Ptr, sizeof(T));
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// Universal binary headers have big-endian byte order.
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if (sys::IsLittleEndianHost)
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swapStruct(Res);
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return Res;
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}
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MachOUniversalBinary::ObjectForArch::ObjectForArch(
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const MachOUniversalBinary *Parent, uint32_t Index)
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: Parent(Parent), Index(Index) {
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// The iterators use Parent as a nullptr and an Index+1 == NumberOfObjects.
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if (!Parent || Index >= Parent->getNumberOfObjects()) {
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clear();
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} else {
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// Parse object header.
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StringRef ParentData = Parent->getData();
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if (Parent->getMagic() == MachO::FAT_MAGIC) {
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const char *HeaderPos = ParentData.begin() + sizeof(MachO::fat_header) +
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Index * sizeof(MachO::fat_arch);
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Header = getUniversalBinaryStruct<MachO::fat_arch>(HeaderPos);
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} else { // Parent->getMagic() == MachO::FAT_MAGIC_64
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const char *HeaderPos = ParentData.begin() + sizeof(MachO::fat_header) +
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Index * sizeof(MachO::fat_arch_64);
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Header64 = getUniversalBinaryStruct<MachO::fat_arch_64>(HeaderPos);
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}
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}
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}
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Expected<std::unique_ptr<MachOObjectFile>>
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MachOUniversalBinary::ObjectForArch::getAsObjectFile() const {
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if (!Parent)
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report_fatal_error("MachOUniversalBinary::ObjectForArch::getAsObjectFile() "
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"called when Parent is a nullptr");
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StringRef ParentData = Parent->getData();
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StringRef ObjectData;
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uint32_t cputype;
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if (Parent->getMagic() == MachO::FAT_MAGIC) {
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ObjectData = ParentData.substr(Header.offset, Header.size);
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cputype = Header.cputype;
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} else { // Parent->getMagic() == MachO::FAT_MAGIC_64
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ObjectData = ParentData.substr(Header64.offset, Header64.size);
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cputype = Header64.cputype;
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}
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StringRef ObjectName = Parent->getFileName();
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MemoryBufferRef ObjBuffer(ObjectData, ObjectName);
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return ObjectFile::createMachOObjectFile(ObjBuffer, cputype, Index);
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}
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Expected<std::unique_ptr<Archive>>
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MachOUniversalBinary::ObjectForArch::getAsArchive() const {
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if (!Parent)
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report_fatal_error("MachOUniversalBinary::ObjectForArch::getAsArchive() "
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"called when Parent is a nullptr");
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StringRef ParentData = Parent->getData();
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StringRef ObjectData;
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if (Parent->getMagic() == MachO::FAT_MAGIC)
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ObjectData = ParentData.substr(Header.offset, Header.size);
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else // Parent->getMagic() == MachO::FAT_MAGIC_64
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ObjectData = ParentData.substr(Header64.offset, Header64.size);
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StringRef ObjectName = Parent->getFileName();
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MemoryBufferRef ObjBuffer(ObjectData, ObjectName);
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return Archive::create(ObjBuffer);
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}
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void MachOUniversalBinary::anchor() { }
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Expected<std::unique_ptr<MachOUniversalBinary>>
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MachOUniversalBinary::create(MemoryBufferRef Source) {
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Error Err = Error::success();
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std::unique_ptr<MachOUniversalBinary> Ret(
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new MachOUniversalBinary(Source, Err));
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if (Err)
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return std::move(Err);
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return std::move(Ret);
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}
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MachOUniversalBinary::MachOUniversalBinary(MemoryBufferRef Source, Error &Err)
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: Binary(Binary::ID_MachOUniversalBinary, Source), Magic(0),
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NumberOfObjects(0) {
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ErrorAsOutParameter ErrAsOutParam(&Err);
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if (Data.getBufferSize() < sizeof(MachO::fat_header)) {
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Err = make_error<GenericBinaryError>("File too small to be a Mach-O "
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"universal file",
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object_error::invalid_file_type);
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return;
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}
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// Check for magic value and sufficient header size.
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StringRef Buf = getData();
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MachO::fat_header H =
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getUniversalBinaryStruct<MachO::fat_header>(Buf.begin());
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Magic = H.magic;
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NumberOfObjects = H.nfat_arch;
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if (NumberOfObjects == 0) {
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Err = malformedError("contains zero architecture types");
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return;
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}
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uint32_t MinSize = sizeof(MachO::fat_header);
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if (Magic == MachO::FAT_MAGIC)
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MinSize += sizeof(MachO::fat_arch) * NumberOfObjects;
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else if (Magic == MachO::FAT_MAGIC_64)
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MinSize += sizeof(MachO::fat_arch_64) * NumberOfObjects;
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else {
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Err = malformedError("bad magic number");
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return;
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}
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if (Buf.size() < MinSize) {
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Err = malformedError("fat_arch" +
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Twine(Magic == MachO::FAT_MAGIC ? "" : "_64") +
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" structs would extend past the end of the file");
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return;
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}
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for (uint32_t i = 0; i < NumberOfObjects; i++) {
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ObjectForArch A(this, i);
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uint64_t bigSize = A.getOffset();
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bigSize += A.getSize();
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if (bigSize > Buf.size()) {
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Err = malformedError("offset plus size of cputype (" +
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Twine(A.getCPUType()) + ") cpusubtype (" +
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Twine(A.getCPUSubType() & ~MachO::CPU_SUBTYPE_MASK) +
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") extends past the end of the file");
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return;
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}
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#define MAXSECTALIGN 15 /* 2**15 or 0x8000 */
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if (A.getAlign() > MAXSECTALIGN) {
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Err = malformedError("align (2^" + Twine(A.getAlign()) + ") too large "
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"for cputype (" + Twine(A.getCPUType()) + ") cpusubtype (" +
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Twine(A.getCPUSubType() & ~MachO::CPU_SUBTYPE_MASK) +
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") (maximum 2^" + Twine(MAXSECTALIGN) + ")");
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return;
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}
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if(A.getOffset() % (1 << A.getAlign()) != 0){
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Err = malformedError("offset: " + Twine(A.getOffset()) +
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" for cputype (" + Twine(A.getCPUType()) + ") cpusubtype (" +
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Twine(A.getCPUSubType() & ~MachO::CPU_SUBTYPE_MASK) +
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") not aligned on it's alignment (2^" + Twine(A.getAlign()) + ")");
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return;
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}
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if (A.getOffset() < MinSize) {
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Err = malformedError("cputype (" + Twine(A.getCPUType()) + ") "
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"cpusubtype (" + Twine(A.getCPUSubType() & ~MachO::CPU_SUBTYPE_MASK) +
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") offset " + Twine(A.getOffset()) + " overlaps universal headers");
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return;
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}
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}
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for (uint32_t i = 0; i < NumberOfObjects; i++) {
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ObjectForArch A(this, i);
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for (uint32_t j = i + 1; j < NumberOfObjects; j++) {
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ObjectForArch B(this, j);
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if (A.getCPUType() == B.getCPUType() &&
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(A.getCPUSubType() & ~MachO::CPU_SUBTYPE_MASK) ==
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(B.getCPUSubType() & ~MachO::CPU_SUBTYPE_MASK)) {
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Err = malformedError("contains two of the same architecture (cputype "
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"(" + Twine(A.getCPUType()) + ") cpusubtype (" +
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Twine(A.getCPUSubType() & ~MachO::CPU_SUBTYPE_MASK) + "))");
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return;
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}
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if ((A.getOffset() >= B.getOffset() &&
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A.getOffset() < B.getOffset() + B.getSize()) ||
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(A.getOffset() + A.getSize() > B.getOffset() &&
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A.getOffset() + A.getSize() < B.getOffset() + B.getSize()) ||
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(A.getOffset() <= B.getOffset() &&
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A.getOffset() + A.getSize() >= B.getOffset() + B.getSize())) {
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Err = malformedError("cputype (" + Twine(A.getCPUType()) + ") "
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"cpusubtype (" + Twine(A.getCPUSubType() & ~MachO::CPU_SUBTYPE_MASK) +
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") at offset " + Twine(A.getOffset()) + " with a size of " +
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Twine(A.getSize()) + ", overlaps cputype (" + Twine(B.getCPUType()) +
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") cpusubtype (" + Twine(B.getCPUSubType() & ~MachO::CPU_SUBTYPE_MASK)
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+ ") at offset " + Twine(B.getOffset()) + " with a size of "
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+ Twine(B.getSize()));
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return;
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}
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}
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}
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Err = Error::success();
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}
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Expected<std::unique_ptr<MachOObjectFile>>
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MachOUniversalBinary::getObjectForArch(StringRef ArchName) const {
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if (Triple(ArchName).getArch() == Triple::ArchType::UnknownArch)
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return make_error<GenericBinaryError>("Unknown architecture "
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"named: " +
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ArchName,
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object_error::arch_not_found);
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for (auto &Obj : objects())
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if (Obj.getArchFlagName() == ArchName)
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return Obj.getAsObjectFile();
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return make_error<GenericBinaryError>("fat file does not "
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"contain " +
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ArchName,
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object_error::arch_not_found);
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}
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