/* -*- mode: C++; c-basic-offset: 4; tab-width: 4 -*-
*
- * Copyright (c) 2005-2007 Apple Inc. All rights reserved.
+ * Copyright (c) 2005-2008 Apple Inc. All rights reserved.
*
* @APPLE_LICENSE_HEADER_START@
*
#include <stddef.h>
#include <fcntl.h>
#include <sys/time.h>
-#include <mach-o/loader.h>
-#include <mach-o/nlist.h>
-#include <mach-o/reloc.h>
-//#include <mach-o/ppc/reloc.h>
-#include <mach-o/stab.h>
#include <uuid/uuid.h>
#include <mach/i386/thread_status.h>
#include <mach/ppc/thread_status.h>
#include "MachOFileAbstraction.hpp"
-#ifndef S_DTRACE_DOF
- #define S_DTRACE_DOF 0xF
-#endif
-
-#ifndef MH_PIE
- #define MH_PIE 0x200000
-#endif
//
//
template <typename A> class CustomStackAtom;
template <typename A> class MachHeaderAtom;
template <typename A> class SegmentLoadCommandsAtom;
+template <typename A> class EncryptionLoadCommandsAtom;
template <typename A> class SymbolTableLoadCommandsAtom;
template <typename A> class ThreadsLoadCommandsAtom;
template <typename A> class DylibIDLoadCommandsAtom;
// SectionInfo should be nested inside Writer, but I can't figure out how to make the type accessible to the Atom classes
class SectionInfo : public ObjectFile::Section {
public:
- SectionInfo() : fFileOffset(0), fSize(0), fRelocCount(0), fRelocOffset(0), fIndirectSymbolOffset(0),
- fAlignment(0), fAllLazyPointers(false), fAllNonLazyPointers(false), fAllStubs(false),
- fAllSelfModifyingStubs(false), fAllZeroFill(false), fVirtualSection(false)
+ SectionInfo() : fFileOffset(0), fSize(0), fRelocCount(0), fRelocOffset(0),
+ fIndirectSymbolOffset(0), fAlignment(0), fAllLazyPointers(false),
+ fAllLazyDylibPointers(false),fAllNonLazyPointers(false), fAllStubs(false),
+ fAllSelfModifyingStubs(false), fAllZeroFill(false), fVirtualSection(false),
+ fHasTextLocalRelocs(false), fHasTextExternalRelocs(false)
{ fSegmentName[0] = '\0'; fSectionName[0] = '\0'; }
void setIndex(unsigned int index) { fIndex=index; }
std::vector<ObjectFile::Atom*> fAtoms;
uint32_t fIndirectSymbolOffset;
uint8_t fAlignment;
bool fAllLazyPointers;
+ bool fAllLazyDylibPointers;
bool fAllNonLazyPointers;
bool fAllStubs;
bool fAllSelfModifyingStubs;
bool fAllZeroFill;
bool fVirtualSection;
+ bool fHasTextLocalRelocs;
+ bool fHasTextExternalRelocs;
};
// SegmentInfo should be nested inside Writer, but I can't figure out how to make the type accessible to the Atom classes
std::vector<class ObjectFile::Reader::Stab>& stabs,
class ObjectFile::Atom* entryPointAtom,
class ObjectFile::Atom* dyldHelperAtom,
+ class ObjectFile::Atom* dyldLazyDylibHelperAtom,
bool createUUID, bool canScatter,
ObjectFile::Reader::CpuConstraint cpuConstraint,
- bool biggerThanTwoGigs);
+ bool biggerThanTwoGigs, bool overridesDylibWeakDefines);
private:
typedef typename A::P P;
const char* getArchString();
void writeMap();
uint64_t writeAtoms();
- void writeNoOps(uint32_t from, uint32_t to);
+ void writeNoOps(int fd, uint32_t from, uint32_t to);
void copyNoOps(uint8_t* from, uint8_t* to);
bool segmentsCanSplitApart(const ObjectFile::Atom& from, const ObjectFile::Atom& to);
void addCrossSegmentRef(const ObjectFile::Atom* atom, const ObjectFile::Reference* ref);
uint32_t addObjectRelocs_powerpc(ObjectFile::Atom* atom, ObjectFile::Reference* ref);
uint8_t getRelocPointerSize();
uint64_t maxAddress();
- bool stubableReference(const ObjectFile::Reference* ref);
+ bool stubableReference(const ObjectFile::Atom* inAtom, const ObjectFile::Reference* ref);
bool GOTReferenceKind(uint8_t kind);
bool optimizableGOTReferenceKind(uint8_t kind);
bool weakImportReferenceKind(uint8_t kind);
void addStabs(uint32_t startIndex);
RelocKind relocationNeededInFinalLinkedImage(const ObjectFile::Atom& target) const;
bool illegalRelocInFinalLinkedImage(const ObjectFile::Reference&);
+ bool generatesLocalTextReloc(const ObjectFile::Reference&, const ObjectFile::Atom& atom, SectionInfo* curSection);
+ bool generatesExternalTextReloc(const ObjectFile::Reference&, const ObjectFile::Atom& atom, SectionInfo* curSection);
bool mightNeedPadSegment();
void scanForAbsoluteReferences();
bool needsModuleTable();
friend class CustomStackAtom<A>;
friend class MachHeaderAtom<A>;
friend class SegmentLoadCommandsAtom<A>;
+ friend class EncryptionLoadCommandsAtom<A>;
friend class SymbolTableLoadCommandsAtom<A>;
friend class ThreadsLoadCommandsAtom<A>;
friend class DylibIDLoadCommandsAtom<A>;
const char* fFilePath;
Options& fOptions;
- int fFileDescriptor;
std::vector<class ObjectFile::Atom*>* fAllAtoms;
std::vector<class ObjectFile::Reader::Stab>* fStabs;
class SectionInfo* fLoadCommandsSection;
class SegmentInfo* fLoadCommandsSegment;
+ class EncryptionLoadCommandsAtom<A>* fEncryptionLoadCommand;
class SegmentLoadCommandsAtom<A>* fSegmentCommands;
class SymbolTableLoadCommandsAtom<A>* fSymbolTableCommands;
class LoadCommandsPaddingAtom<A>* fHeaderPadding;
class SegmentInfo* fPadSegmentInfo;
class ObjectFile::Atom* fEntryPoint;
class ObjectFile::Atom* fDyldHelper;
+ class ObjectFile::Atom* fDyldLazyDylibHelper;
std::map<class ObjectFile::Reader*, DylibLoadCommandsAtom<A>*> fLibraryToLoadCommand;
std::map<class ObjectFile::Reader*, uint32_t> fLibraryToOrdinal;
std::map<class ObjectFile::Reader*, class ObjectFile::Reader*> fLibraryAliases;
std::vector<class StubAtom<A>*> fAllSynthesizedStubs;
std::vector<ObjectFile::Atom*> fAllSynthesizedStubHelpers;
std::vector<class LazyPointerAtom<A>*> fAllSynthesizedLazyPointers;
+ std::vector<class LazyPointerAtom<A>*> fAllSynthesizedLazyDylibPointers;
std::vector<class NonLazyPointerAtom<A>*> fAllSynthesizedNonLazyPointers;
uint32_t fSymbolTableCount;
uint32_t fSymbolTableStabsCount;
bool fBiggerThanTwoGigs;
bool fSlideable;
std::map<const ObjectFile::Atom*,bool> fWeakImportMap;
+ std::set<const ObjectFile::Reader*> fDylibReadersWithNonWeakImports;
+ std::set<const ObjectFile::Reader*> fDylibReadersWithWeakImports;
SegmentInfo* fFirstWritableSegment;
ObjectFile::Reader::CpuConstraint fCpuConstraint;
uint32_t fAnonNameIndex;
virtual SymbolTableInclusion getSymbolTableInclusion() const { return ObjectFile::Atom::kSymbolTableNotIn; }
virtual bool dontDeadStrip() const { return true; }
virtual bool isZeroFill() const { return false; }
+ virtual bool isThumb() const { return false; }
virtual std::vector<ObjectFile::Reference*>& getReferences() const { return fgEmptyReferenceList; }
virtual bool mustRemainInSection() const { return true; }
virtual ObjectFile::Segment& getSegment() const { return fSegment; }
virtual const char* getSectionName() const { return "._load_commands"; }
virtual uint32_t getOrdinal() const { return fOrdinal; }
static uint64_t alignedSize(uint64_t size);
-private:
+protected:
uint32_t fOrdinal;
static uint32_t fgCurrentOrdinal;
};
{
public:
DylibLoadCommandsAtom(Writer<A>& writer, ExecutableFile::DyLibUsed& info)
- : LoadCommandAtom<A>(writer, Segment::fgTextSegment), fInfo(info), fOptimizedAway(false) {}
+ : LoadCommandAtom<A>(writer, Segment::fgTextSegment), fInfo(info),
+ fOptimizedAway(false) { if (fInfo.options.fLazyLoad) this->fOrdinal += 256; }
virtual const char* getDisplayName() const { return "dylib load command"; }
virtual uint64_t getSize() const;
virtual void copyRawContent(uint8_t buffer[]) const;
virtual void optimizeAway() { fOptimizedAway = true; }
+ bool linkedWeak() { return fInfo.options.fWeakImport; }
private:
using WriterAtom<A>::fWriter;
typedef typename A::P P;
const char* fPath;
};
+template <typename A>
+class EncryptionLoadCommandsAtom : public LoadCommandAtom<A>
+{
+public:
+ EncryptionLoadCommandsAtom(Writer<A>& writer)
+ : LoadCommandAtom<A>(writer, Segment::fgTextSegment), fStartOffset(0),
+ fEndOffset(0) {}
+ virtual const char* getDisplayName() const { return "encryption info load command"; }
+ virtual uint64_t getSize() const { return sizeof(macho_encryption_info_command<typename A::P>); }
+ virtual void copyRawContent(uint8_t buffer[]) const;
+ void setStartEncryptionOffset(uint32_t off) { fStartOffset = off; }
+ void setEndEncryptionOffset(uint32_t off) { fEndOffset = off; }
+private:
+ using WriterAtom<A>::fWriter;
+ typedef typename A::P P;
+ uint32_t fStartOffset;
+ uint32_t fEndOffset;
+};
template <typename A>
class LoadCommandsPaddingAtom : public WriterAtom<A>
{
public:
ModuleInfoLinkEditAtom(Writer<A>& writer) : LinkEditAtom<A>(writer), fModuleNameOffset(0) { }
- virtual const char* getDisplayName() const { return "modulel table"; }
+ virtual const char* getDisplayName() const { return "module table"; }
virtual uint64_t getSize() const;
virtual const char* getSectionName() const { return "._module_info"; }
virtual void copyRawContent(uint8_t buffer[]) const;
class StubAtom : public WriterAtom<A>
{
public:
- StubAtom(Writer<A>& writer, ObjectFile::Atom& target);
+ StubAtom(Writer<A>& writer, ObjectFile::Atom& target, bool forLazyDylib);
virtual const char* getName() const { return fName; }
virtual ObjectFile::Atom::Scope getScope() const { return ObjectFile::Atom::scopeLinkageUnit; }
virtual uint64_t getSize() const;
ObjectFile::Atom* getTarget() { return &fTarget; }
private:
static const char* stubName(const char* importName);
- bool pic() const;
+ bool pic() const { return fWriter.fSlideable; }
using WriterAtom<A>::fWriter;
const char* fName;
ObjectFile::Atom& fTarget;
std::vector<ObjectFile::Reference*> fReferences;
+ bool fForLazyDylib;
};
template <typename A>
class StubHelperAtom : public WriterAtom<A>
{
public:
- StubHelperAtom(Writer<A>& writer, ObjectFile::Atom& target, ObjectFile::Atom& lazyPointer);
+ StubHelperAtom(Writer<A>& writer, ObjectFile::Atom& target, ObjectFile::Atom& lazyPointer, bool forLazyDylib);
virtual const char* getName() const { return fName; }
virtual ObjectFile::Atom::Scope getScope() const { return ObjectFile::Atom::scopeLinkageUnit; }
virtual uint64_t getSize() const;
class LazyPointerAtom : public WriterAtom<A>
{
public:
- LazyPointerAtom(Writer<A>& writer, ObjectFile::Atom& target);
+ LazyPointerAtom(Writer<A>& writer, ObjectFile::Atom& target,
+ StubAtom<A>& stub, bool forLazyDylib);
virtual const char* getName() const { return fName; }
virtual ObjectFile::Atom::Scope getScope() const { return ObjectFile::Atom::scopeLinkageUnit; }
virtual uint64_t getSize() const { return sizeof(typename A::P::uint_t); }
- virtual const char* getSectionName() const { return "__la_symbol_ptr"; }
+ virtual const char* getSectionName() const { return fForLazyDylib ? "__ld_symbol_ptr" : "__la_symbol_ptr"; }
virtual std::vector<ObjectFile::Reference*>& getReferences() const { return (std::vector<ObjectFile::Reference*>&)(fReferences); }
virtual void copyRawContent(uint8_t buffer[]) const;
- ObjectFile::Atom* getTarget() { return &fTarget; }
+ ObjectFile::Atom* getTarget() { return &fExternalTarget; }
private:
using WriterAtom<A>::fWriter;
static const char* lazyPointerName(const char* importName);
const char* fName;
ObjectFile::Atom& fTarget;
+ ObjectFile::Atom& fExternalTarget;
std::vector<ObjectFile::Reference*> fReferences;
+ bool fForLazyDylib;
};
template <>
-StubHelperAtom<x86_64>::StubHelperAtom(Writer<x86_64>& writer, ObjectFile::Atom& target, ObjectFile::Atom& lazyPointer)
+StubHelperAtom<x86_64>::StubHelperAtom(Writer<x86_64>& writer, ObjectFile::Atom& target,
+ ObjectFile::Atom& lazyPointer, bool forLazyDylib)
: WriterAtom<x86_64>(writer, Segment::fgTextSegment), fName(stubName(target.getName())), fTarget(target)
{
writer.fAllSynthesizedStubHelpers.push_back(this);
fReferences.push_back(new WriterReference<x86_64>(3, x86_64::kPCRel32, &lazyPointer));
- fReferences.push_back(new WriterReference<x86_64>(8, x86_64::kPCRel32, writer.fDyldHelper));
- if ( writer.fDyldHelper == NULL )
- throw "symbol dyld_stub_binding_helper not defined (usually in crt1.o/dylib1.o/bundle1.o)";
+ if ( forLazyDylib ) {
+ if ( writer.fDyldLazyDylibHelper == NULL )
+ throw "symbol dyld_lazy_dylib_stub_binding_helper not defined (usually in lazydylib1.o)";
+ fReferences.push_back(new WriterReference<x86_64>(8, x86_64::kPCRel32, writer.fDyldLazyDylibHelper));
+ }
+ else {
+ if ( writer.fDyldHelper == NULL )
+ throw "symbol dyld_stub_binding_helper not defined (usually in crt1.o/dylib1.o/bundle1.o)";
+ fReferences.push_back(new WriterReference<x86_64>(8, x86_64::kPCRel32, writer.fDyldHelper));
+ }
}
template <>
buffer[11] = 0x00;
}
+
template <typename A>
const char* StubHelperAtom<A>::stubName(const char* name)
{
// specialize lazy pointer for x86_64 to initially pointer to stub helper
template <>
-LazyPointerAtom<x86_64>::LazyPointerAtom(Writer<x86_64>& writer, ObjectFile::Atom& target)
- : WriterAtom<x86_64>(writer, Segment::fgDataSegment), fName(lazyPointerName(target.getName())), fTarget(target)
+LazyPointerAtom<x86_64>::LazyPointerAtom(Writer<x86_64>& writer, ObjectFile::Atom& target, StubAtom<x86_64>& stub, bool forLazyDylib)
+ : WriterAtom<x86_64>(writer, Segment::fgDataSegment), fName(lazyPointerName(target.getName())), fTarget(target),
+ fExternalTarget(*stub.getTarget()), fForLazyDylib(forLazyDylib)
{
- writer.fAllSynthesizedLazyPointers.push_back(this);
+ if ( forLazyDylib )
+ writer.fAllSynthesizedLazyDylibPointers.push_back(this);
+ else
+ writer.fAllSynthesizedLazyPointers.push_back(this);
- StubHelperAtom<x86_64>* helper = new StubHelperAtom<x86_64>(writer, target, *this);
+ StubHelperAtom<x86_64>* helper = new StubHelperAtom<x86_64>(writer, target, *this, forLazyDylib);
fReferences.push_back(new WriterReference<x86_64>(0, x86_64::kPointer, helper));
}
+// specialize lazy pointer for x86 to initially pointer to second half of stub
+template <>
+LazyPointerAtom<x86>::LazyPointerAtom(Writer<x86>& writer, ObjectFile::Atom& target, StubAtom<x86>& stub, bool forLazyDylib)
+ : WriterAtom<x86>(writer, Segment::fgDataSegment), fName(lazyPointerName(target.getName())), fTarget(target),
+ fExternalTarget(*stub.getTarget()), fForLazyDylib(forLazyDylib)
+{
+ if ( forLazyDylib )
+ writer.fAllSynthesizedLazyDylibPointers.push_back(this);
+ else
+ writer.fAllSynthesizedLazyPointers.push_back(this);
+
+ // helper part of stub is 14 or 6 bytes into stub
+ fReferences.push_back(new WriterReference<x86>(0, x86::kPointer, &stub, writer.fSlideable ? 14 : 6));
+}
template <typename A>
-LazyPointerAtom<A>::LazyPointerAtom(Writer<A>& writer, ObjectFile::Atom& target)
- : WriterAtom<A>(writer, Segment::fgDataSegment), fName(lazyPointerName(target.getName())), fTarget(target)
+LazyPointerAtom<A>::LazyPointerAtom(Writer<A>& writer, ObjectFile::Atom& target, StubAtom<A>& stub, bool forLazyDylib)
+ : WriterAtom<A>(writer, Segment::fgDataSegment), fName(lazyPointerName(target.getName())), fTarget(target),
+ fExternalTarget(*stub.getTarget()), fForLazyDylib(forLazyDylib)
{
- writer.fAllSynthesizedLazyPointers.push_back(this);
+ if ( forLazyDylib )
+ writer.fAllSynthesizedLazyDylibPointers.push_back(this);
+ else
+ writer.fAllSynthesizedLazyPointers.push_back(this);
fReferences.push_back(new WriterReference<A>(0, A::kPointer, &target));
}
return ( fWriter.fSlideable || ((fWriter.fPageZeroAtom != NULL) && (fWriter.fPageZeroAtom->getSize() > 4096)) );
}
+
template <>
-bool StubAtom<ppc>::pic() const
+bool StubAtom<arm>::pic() const
{
return fWriter.fSlideable;
}
}
template <>
-StubAtom<ppc>::StubAtom(Writer<ppc>& writer, ObjectFile::Atom& target)
- : WriterAtom<ppc>(writer, Segment::fgTextSegment), fName(stubName(target.getName())), fTarget(target)
+ObjectFile::Alignment StubAtom<arm>::getAlignment() const
{
- writer.fAllSynthesizedStubs.push_back(this);
+ return 2;
+}
- LazyPointerAtom<ppc>* lp = new LazyPointerAtom<ppc>(writer, target);
+template <>
+StubAtom<ppc>::StubAtom(Writer<ppc>& writer, ObjectFile::Atom& target, bool forLazyDylib)
+ : WriterAtom<ppc>(writer, Segment::fgTextSegment), fName(stubName(target.getName())),
+ fTarget(target), fForLazyDylib(forLazyDylib)
+{
+ writer.fAllSynthesizedStubs.push_back(this);
+ LazyPointerAtom<ppc>* lp;
+ if ( fWriter.fOptions.prebind() ) {
+ // for prebound ppc, lazy pointer starts out pointing to target symbol's address
+ // if target is a weak definition within this linkage unit or zero if in some dylib
+ lp = new LazyPointerAtom<ppc>(writer, target, *this, forLazyDylib);
+ }
+ else {
+ // for non-prebound ppc, lazy pointer starts out pointing to dyld_stub_binding_helper glue code
+ if ( forLazyDylib ) {
+ if ( writer.fDyldLazyDylibHelper == NULL )
+ throw "symbol dyld_lazy_dylib_stub_binding_helper not defined (usually in lazydylib1.o)";
+ lp = new LazyPointerAtom<ppc>(writer, *writer.fDyldLazyDylibHelper, *this, forLazyDylib);
+ }
+ else {
+ if ( writer.fDyldHelper == NULL )
+ throw "symbol dyld_stub_binding_helper not defined (usually in crt1.o/dylib1.o/bundle1.o)";
+ lp = new LazyPointerAtom<ppc>(writer, *writer.fDyldHelper, *this, forLazyDylib);
+ }
+ }
if ( pic() ) {
// picbase is 8 bytes into atom
fReferences.push_back(new WriterReference<ppc>(12, ppc::kPICBaseHigh16, lp, 0, this, 8));
}
template <>
-StubAtom<ppc64>::StubAtom(Writer<ppc64>& writer, ObjectFile::Atom& target)
- : WriterAtom<ppc64>(writer, Segment::fgTextSegment), fName(stubName(target.getName())), fTarget(target)
+StubAtom<ppc64>::StubAtom(Writer<ppc64>& writer, ObjectFile::Atom& target, bool forLazyDylib)
+ : WriterAtom<ppc64>(writer, Segment::fgTextSegment), fName(stubName(target.getName())),
+ fTarget(target), fForLazyDylib(forLazyDylib)
{
writer.fAllSynthesizedStubs.push_back(this);
- LazyPointerAtom<ppc64>* lp = new LazyPointerAtom<ppc64>(writer, target);
+ LazyPointerAtom<ppc64>* lp;
+ if ( forLazyDylib ) {
+ if ( writer.fDyldLazyDylibHelper == NULL )
+ throw "symbol dyld_lazy_dylib_stub_binding_helper not defined (usually in lazydylib1.o)";
+ lp = new LazyPointerAtom<ppc64>(writer, *writer.fDyldLazyDylibHelper, *this, forLazyDylib);
+ }
+ else {
+ if ( writer.fDyldHelper == NULL )
+ throw "symbol dyld_stub_binding_helper not defined (usually in crt1.o/dylib1.o/bundle1.o)";
+ lp = new LazyPointerAtom<ppc64>(writer, *writer.fDyldHelper, *this, forLazyDylib);
+ }
if ( pic() ) {
// picbase is 8 bytes into atom
fReferences.push_back(new WriterReference<ppc64>(12, ppc64::kPICBaseHigh16, lp, 0, this, 8));
// specialize to put x86 fast stub in __IMPORT segment with no lazy pointer
template <>
-StubAtom<x86>::StubAtom(Writer<x86>& writer, ObjectFile::Atom& target)
- : WriterAtom<x86>(writer, writer.fOptions.readOnlyx86Stubs() ? Segment::fgROImportSegment : Segment::fgImportSegment),
- fTarget(target)
+StubAtom<x86>::StubAtom(Writer<x86>& writer, ObjectFile::Atom& target, bool forLazyDylib)
+ : WriterAtom<x86>(writer, (writer.fOptions.slowx86Stubs() || forLazyDylib) ? Segment::fgTextSegment :
+ ( writer.fOptions.readOnlyx86Stubs() ? Segment::fgROImportSegment : Segment::fgImportSegment)),
+ fTarget(target), fForLazyDylib(forLazyDylib)
{
- if ( &target == NULL )
- fName = "cache-line-crossing-stub";
- else {
+ if ( writer.fOptions.slowx86Stubs() || forLazyDylib ) {
fName = stubName(target.getName());
writer.fAllSynthesizedStubs.push_back(this);
+ LazyPointerAtom<x86>* lp = new LazyPointerAtom<x86>(writer, target, *this, forLazyDylib);
+ ObjectFile::Atom* helper;
+ if ( forLazyDylib ) {
+ if ( writer.fDyldLazyDylibHelper == NULL )
+ throw "symbol dyld_lazy_dylib_stub_binding_helper not defined (usually in lazydylib1.o)";
+ helper = writer.fDyldLazyDylibHelper;
+ }
+ else {
+ if ( writer.fDyldHelper == NULL )
+ throw "symbol dyld_stub_binding_helper not defined (usually in crt1.o/dylib1.o/bundle1.o)";
+ helper = writer.fDyldHelper;
+ }
+ if ( pic() ) {
+ // picbase is 5 bytes into atom
+ fReferences.push_back(new WriterReference<x86>(8, x86::kPointerDiff, lp, 0, this, 5));
+ fReferences.push_back(new WriterReference<x86>(16, x86::kPCRel32, helper));
+ }
+ else {
+ fReferences.push_back(new WriterReference<x86>(2, x86::kAbsolute32, lp));
+ fReferences.push_back(new WriterReference<x86>(7, x86::kAbsolute32, lp));
+ fReferences.push_back(new WriterReference<x86>(12, x86::kPCRel32, helper));
+ }
+ }
+ else {
+ if ( &target == NULL )
+ fName = "cache-line-crossing-stub";
+ else {
+ fName = stubName(target.getName());
+ writer.fAllSynthesizedStubs.push_back(this);
+ }
}
}
template <>
-StubAtom<x86_64>::StubAtom(Writer<x86_64>& writer, ObjectFile::Atom& target)
+StubAtom<x86_64>::StubAtom(Writer<x86_64>& writer, ObjectFile::Atom& target, bool forLazyDylib)
: WriterAtom<x86_64>(writer, Segment::fgTextSegment), fName(stubName(target.getName())), fTarget(target)
{
writer.fAllSynthesizedStubs.push_back(this);
- LazyPointerAtom<x86_64>* lp = new LazyPointerAtom<x86_64>(writer, target);
+ LazyPointerAtom<x86_64>* lp = new LazyPointerAtom<x86_64>(writer, target, *this, forLazyDylib);
fReferences.push_back(new WriterReference<x86_64>(2, x86_64::kPCRel32, lp));
}
+template <>
+StubAtom<arm>::StubAtom(Writer<arm>& writer, ObjectFile::Atom& target, bool forLazyDylib)
+ : WriterAtom<arm>(writer, Segment::fgTextSegment), fName(stubName(target.getName())), fTarget(target)
+{
+ writer.fAllSynthesizedStubs.push_back(this);
+
+ LazyPointerAtom<arm>* lp;
+ if ( fWriter.fOptions.prebind() && !forLazyDylib ) {
+ // for prebound arm, lazy pointer starts out pointing to target symbol's address
+ // if target is a weak definition within this linkage unit or zero if in some dylib
+ lp = new LazyPointerAtom<arm>(writer, target, *this, forLazyDylib);
+ }
+ else {
+ // for non-prebound arm, lazy pointer starts out pointing to dyld_stub_binding_helper glue code
+ ObjectFile::Atom* helper;
+ if ( forLazyDylib ) {
+ if ( writer.fDyldLazyDylibHelper == NULL )
+ throw "symbol dyld_lazy_dylib_stub_binding_helper not defined (usually in lazydylib1.o)";
+ helper = writer.fDyldLazyDylibHelper;
+ }
+ else {
+ if ( writer.fDyldHelper == NULL )
+ throw "symbol dyld_stub_binding_helper not defined (usually in crt1.o/dylib1.o/bundle1.o)";
+ helper = writer.fDyldHelper;
+ }
+ lp = new LazyPointerAtom<arm>(writer, *helper, *this, forLazyDylib);
+ }
+ if ( pic() )
+ fReferences.push_back(new WriterReference<arm>(12, arm::kPointerDiff, lp, 0, this, 12));
+ else
+ fReferences.push_back(new WriterReference<arm>(8, arm::kPointer, lp));
+}
+
template <typename A>
const char* StubAtom<A>::stubName(const char* name)
{
return ( pic() ? 32 : 16 );
}
+
+template <>
+uint64_t StubAtom<arm>::getSize() const
+{
+ return ( pic() ? 16 : 12 );
+}
+
template <>
uint64_t StubAtom<x86>::getSize() const
{
+ if ( fWriter.fOptions.slowx86Stubs() || fForLazyDylib ) {
+ if ( pic() )
+ return 20;
+ else
+ return 16;
+ }
return 5;
}
template <>
ObjectFile::Alignment StubAtom<x86>::getAlignment() const
{
- // special case x86 fast stubs to be byte aligned
- return 0;
+ if ( fWriter.fOptions.slowx86Stubs() || fForLazyDylib )
+ return 2;
+ else
+ return 0; // special case x86 fast stubs to be byte aligned
}
template <>
template <>
void StubAtom<x86>::copyRawContent(uint8_t buffer[]) const
{
- if ( fWriter.fOptions.prebind() ) {
- uint32_t address = this->getAddress();
- int32_t rel32 = 0 - (address+5);
- buffer[0] = 0xE9;
- buffer[1] = rel32 & 0xFF;
- buffer[2] = (rel32 >> 8) & 0xFF;
- buffer[3] = (rel32 >> 16) & 0xFF;
- buffer[4] = (rel32 >> 24) & 0xFF;
+ if ( fWriter.fOptions.slowx86Stubs() || fForLazyDylib ) {
+ if ( pic() ) {
+ buffer[0] = 0xE8; // call picbase
+ buffer[1] = 0x00;
+ buffer[2] = 0x00;
+ buffer[3] = 0x00;
+ buffer[4] = 0x00;
+ buffer[5] = 0x58; // pop eax
+ buffer[6] = 0x8D; // lea foo$lazy_pointer-picbase(eax),eax
+ buffer[7] = 0x80;
+ buffer[8] = 0x00;
+ buffer[9] = 0x00;
+ buffer[10] = 0x00;
+ buffer[11] = 0x00;
+ buffer[12] = 0xFF; // jmp *(eax)
+ buffer[13] = 0x20;
+ buffer[14] = 0x50; // push eax
+ buffer[15] = 0xE9; // jump dyld_stub_binding_helper
+ buffer[16] = 0x00;
+ buffer[17] = 0x00;
+ buffer[18] = 0x00;
+ buffer[19] = 0x00;
+ }
+ else {
+ buffer[0] = 0xFF; // jmp *foo$lazy_pointer
+ buffer[1] = 0x25;
+ buffer[2] = 0x00;
+ buffer[3] = 0x00;
+ buffer[4] = 0x00;
+ buffer[5] = 0x00;
+ buffer[6] = 0x68; // pushl $foo$lazy_pointer
+ buffer[7] = 0x00;
+ buffer[8] = 0x00;
+ buffer[9] = 0x00;
+ buffer[10] = 0x00;
+ buffer[11] = 0xE9; // jump dyld_stub_binding_helper
+ buffer[12] = 0x00;
+ buffer[13] = 0x00;
+ buffer[14] = 0x00;
+ buffer[15] = 0x00;
+ }
}
else {
- buffer[0] = 0xF4;
- buffer[1] = 0xF4;
- buffer[2] = 0xF4;
- buffer[3] = 0xF4;
- buffer[4] = 0xF4;
+ if ( fWriter.fOptions.prebind() ) {
+ uint32_t address = this->getAddress();
+ int32_t rel32 = 0 - (address+5);
+ buffer[0] = 0xE9;
+ buffer[1] = rel32 & 0xFF;
+ buffer[2] = (rel32 >> 8) & 0xFF;
+ buffer[3] = (rel32 >> 16) & 0xFF;
+ buffer[4] = (rel32 >> 24) & 0xFF;
+ }
+ else {
+ buffer[0] = 0xF4;
+ buffer[1] = 0xF4;
+ buffer[2] = 0xF4;
+ buffer[3] = 0xF4;
+ buffer[4] = 0xF4;
+ }
}
}
buffer[5] = 0x00;
}
+template <>
+void StubAtom<arm>::copyRawContent(uint8_t buffer[]) const
+{
+ if ( pic() ) {
+ OSWriteLittleInt32(&buffer[ 0], 0, 0xe59fc004); // ldr ip, pc + 12
+ OSWriteLittleInt32(&buffer[ 4], 0, 0xe08fc00c); // add ip, pc, ip
+ OSWriteLittleInt32(&buffer[ 8], 0, 0xe59cf000); // ldr pc, [ip]
+ OSWriteLittleInt32(&buffer[12], 0, 0x00000000); // .long L_foo$lazy_ptr - (L1$scv + 8)
+ }
+ else {
+ OSWriteLittleInt32(&buffer[ 0], 0, 0xe59fc000); // ldr ip, [pc, #0]
+ OSWriteLittleInt32(&buffer[ 4], 0, 0xe59cf000); // ldr pc, [ip]
+ OSWriteLittleInt32(&buffer[ 8], 0, 0x00000000); // .long L_foo$lazy_ptr
+ }
+}
+
// x86_64 stubs are 7 bytes and need no alignment
template <>
ObjectFile::Alignment StubAtom<x86_64>::getAlignment() const
return ( pic() ? "__picsymbolstub1" : "__symbol_stub1");
}
+template <>
+const char* StubAtom<arm>::getSectionName() const
+{
+ return ( pic() ? "__picsymbolstub4" : "__symbol_stub4");
+}
+
template <>
const char* StubAtom<x86>::getSectionName() const
{
+ if ( fWriter.fOptions.slowx86Stubs() || fForLazyDylib ) {
+ if ( pic() )
+ return "__picsymbol_stub";
+ else
+ return "__symbol_stub";
+ }
return "__jump_table";
}
template <typename A>
Writer<A>::Writer(const char* path, Options& options, std::vector<ExecutableFile::DyLibUsed>& dynamicLibraries)
- : ExecutableFile::Writer(dynamicLibraries), fFilePath(strdup(path)), fOptions(options), fLoadCommandsSection(NULL),
- fLoadCommandsSegment(NULL), fPadSegmentInfo(NULL), fSplitCodeToDataContentAtom(NULL), fModuleInfoAtom(NULL),
- fPageZeroAtom(NULL), fSymbolTableCount(0), fLargestAtomSize(1),
- fEmitVirtualSections(false), fHasWeakExports(false), fReferencesWeakImports(false),
- fCanScatter(false), fWritableSegmentPastFirst4GB(false), fNoReExportedDylibs(false), fSlideable(false),
+ : ExecutableFile::Writer(dynamicLibraries), fFilePath(strdup(path)), fOptions(options),
+ fAllAtoms(NULL), fStabs(NULL), fLoadCommandsSection(NULL),
+ fLoadCommandsSegment(NULL), fEncryptionLoadCommand(NULL), fSegmentCommands(NULL),
+ fSymbolTableCommands(NULL), fHeaderPadding(NULL),
+ fUUIDAtom(NULL), fPadSegmentInfo(NULL), fEntryPoint( NULL), fDyldHelper(NULL), fDyldLazyDylibHelper(NULL),
+ fSectionRelocationsAtom(NULL), fLocalRelocationsAtom(NULL), fExternalRelocationsAtom(NULL),
+ fSymbolTableAtom(NULL), fSplitCodeToDataContentAtom(NULL), fIndirectTableAtom(NULL), fModuleInfoAtom(NULL),
+ fStringsAtom(NULL), fPageZeroAtom(NULL), fSymbolTable(NULL), fSymbolTableCount(0), fSymbolTableStabsCount(0),
+ fSymbolTableLocalCount(0), fSymbolTableExportCount(0), fSymbolTableImportCount(0),
+ fLargestAtomSize(1),
+ fEmitVirtualSections(false), fHasWeakExports(false), fReferencesWeakImports(false),
+ fCanScatter(false), fWritableSegmentPastFirst4GB(false), fNoReExportedDylibs(false),
+ fBiggerThanTwoGigs(false), fSlideable(false),
fFirstWritableSegment(NULL), fAnonNameIndex(1000)
{
- // for UNIX conformance, error if file exists and is not writable
- if ( (access(path, F_OK) == 0) && (access(path, W_OK) == -1) )
- throwf("can't write output file: %s", path);
-
- int permissions = 0777;
- if ( fOptions.outputKind() == Options::kObjectFile )
- permissions = 0666;
- // Calling unlink first assures the file is gone so that open creates it with correct permissions
- // It also handles the case where fFilePath file is not writable but its directory is
- // And it means we don't have to truncate the file when done writing (in case new is smaller than old)
- (void)unlink(fFilePath);
- fFileDescriptor = open(fFilePath, O_CREAT | O_WRONLY | O_TRUNC, permissions);
- if ( fFileDescriptor == -1 ) {
- throwf("can't open output file for writing: %s", path);
- }
-
switch ( fOptions.outputKind() ) {
case Options::kDynamicExecutable:
case Options::kStaticExecutable:
// add extra commmands
bool hasReExports = false;
- uint8_t ordinal = 1;
+ uint32_t ordinal = 1;
switch ( fOptions.outputKind() ) {
case Options::kDynamicExecutable:
+ if ( fOptions.makeEncryptable() ) {
+ fEncryptionLoadCommand = new EncryptionLoadCommandsAtom<A>(*this);
+ fWriterSynthesizedAtoms.push_back(fEncryptionLoadCommand);
+ }
+ // fall through
case Options::kDynamicLibrary:
case Options::kDynamicBundle:
{
uint64_t Writer<A>::write(std::vector<class ObjectFile::Atom*>& atoms,
std::vector<class ObjectFile::Reader::Stab>& stabs,
class ObjectFile::Atom* entryPointAtom, class ObjectFile::Atom* dyldHelperAtom,
+ class ObjectFile::Atom* dyldLazyDylibHelperAtom,
bool createUUID, bool canScatter, ObjectFile::Reader::CpuConstraint cpuConstraint,
- bool biggerThanTwoGigs)
+ bool biggerThanTwoGigs, bool overridesDylibWeakDefines)
{
fAllAtoms = &atoms;
fStabs = &stabs;
fEntryPoint = entryPointAtom;
fDyldHelper = dyldHelperAtom;
+ fDyldLazyDylibHelper = dyldLazyDylibHelperAtom;
fCanScatter = canScatter;
fCpuConstraint = cpuConstraint;
fBiggerThanTwoGigs = biggerThanTwoGigs;
+ fHasWeakExports = overridesDylibWeakDefines; // dyld needs to search this image as if it had weak exports
try {
// Set for create UUID
// remove uneeded dylib load commands
optimizeDylibReferences();
- // check for mdynamic-no-pic codegen which force code into low 4GB
+ // check for mdynamic-no-pic codegen
scanForAbsoluteReferences();
// create inter-library stubs
return writeAtoms();
} catch (...) {
// clean up if any errors
- close(fFileDescriptor);
(void)unlink(fFilePath);
throw;
}
// set n_desc
uint16_t desc = 0;
- if ( atom->getSymbolTableInclusion() == ObjectFile::Atom::kSymbolTableInAndNeverStrip )
- desc |= REFERENCED_DYNAMICALLY;
- if ( atom->getDefinitionKind() == ObjectFile::Atom::kWeakDefinition ) {
- desc |= N_WEAK_DEF;
- fHasWeakExports = true;
- }
+ if ( atom->isThumb() )
+ desc |= N_ARM_THUMB_DEF;
+ if ( atom->getSymbolTableInclusion() == ObjectFile::Atom::kSymbolTableInAndNeverStrip )
+ desc |= REFERENCED_DYNAMICALLY;
+ if ( atom->getDefinitionKind() == ObjectFile::Atom::kWeakDefinition ) {
+ desc |= N_WEAK_DEF;
+ fHasWeakExports = true;
+ }
entry->set_n_desc(desc);
// set n_value ( address this symbol will be at if this executable is loaded at it preferred address )
if ( fOptions.outputKind() != Options::kObjectFile ) {
// set n_desc ( high byte is library ordinal, low byte is reference type )
std::map<const ObjectFile::Atom*,ObjectFile::Atom*>::iterator pos = fStubsMap.find(atom);
- if ( pos != fStubsMap.end() )
+ if ( pos != fStubsMap.end() || ( strncmp(atom->getName(), ".objc_class_name_", 17) == 0) )
desc = REFERENCE_FLAG_UNDEFINED_LAZY;
else
desc = REFERENCE_FLAG_UNDEFINED_NON_LAZY;
}
else if ( atom->getDefinitionKind() == ObjectFile::Atom::kTentativeDefinition ) {
uint8_t align = atom->getAlignment().powerOf2;
- // if alignment does not match size, then record the custom alignment
- if ( align != __builtin_ctz(atom->getSize()) )
- SET_COMM_ALIGN(desc, align);
+ // always record custom alignment of common symbols to match what compiler does
+ SET_COMM_ALIGN(desc, align);
}
+ if ( atom->isThumb() )
+ desc |= N_ARM_THUMB_DEF;
if ( atom->getSymbolTableInclusion() == ObjectFile::Atom::kSymbolTableInAndNeverStrip )
desc |= REFERENCED_DYNAMICALLY;
if ( ( fOptions.outputKind() != Options::kObjectFile) && (atom->getDefinitionKind() == ObjectFile::Atom::kExternalWeakDefinition) ) {
uint16_t desc = 0;
if ( atom->getDefinitionKind() == ObjectFile::Atom::kWeakDefinition )
desc |= N_WEAK_DEF;
+ if ( atom->isThumb() )
+ desc |= N_ARM_THUMB_DEF;
entry->set_n_desc(desc);
// set n_value ( address this symbol will be at if this executable is loaded at it preferred address )
}
}
// when geneating a .o file, dtrace static probes become local labels
- if ( fOptions.outputKind() == Options::kObjectFile) {
+ if ( (fOptions.outputKind() == Options::kObjectFile) && !fOptions.readerOptions().fForStatic ) {
std::vector<ObjectFile::Reference*>& references = atom->getReferences();
for (std::vector<ObjectFile::Reference*>::iterator rit=references.begin(); rit != references.end(); rit++) {
ObjectFile::Reference* ref = *rit;
}
}
// when linking kernel, old style dtrace static probes become global labels
- else if ( fOptions.outputKind() == Options::kStaticExecutable ) {
+ else if ( fOptions.readerOptions().fForStatic ) {
std::vector<ObjectFile::Reference*>& references = atom->getReferences();
for (std::vector<ObjectFile::Reference*>::iterator rit=references.begin(); rit != references.end(); rit++) {
ObjectFile::Reference* ref = *rit;
switch ( kind ) {
case x86_64::kNoFixUp:
case x86_64::kFollowOn:
+ case x86_64::kGroupSubordinate:
return 0;
case x86_64::kPointer:
fSectionRelocs.push_back(reloc1);
return 1;
+ case x86_64::kBranchPCRel8:
+ reloc1.set_r_address(address);
+ reloc1.set_r_symbolnum(symbolIndex);
+ reloc1.set_r_pcrel(true);
+ reloc1.set_r_length(0);
+ reloc1.set_r_extern(external);
+ reloc1.set_r_type(X86_64_RELOC_BRANCH);
+ fSectionRelocs.push_back(reloc1);
+ return 1;
+
case x86_64::kPCRel32GOT:
case x86_64::kPCRel32GOTWeakImport:
reloc1.set_r_address(address);
x86::ReferenceKinds kind = (x86::ReferenceKinds)ref->getKind();
if ( !isExtern && (sectionNum == 0) && (target.getDefinitionKind() != ObjectFile::Atom::kAbsoluteSymbol) )
- fprintf(stderr, "ld: warning section index == 0 for %s (kind=%d, scope=%d, inclusion=%d) in %s\n",
+ warning("section index == 0 for %s (kind=%d, scope=%d, inclusion=%d) in %s",
target.getDisplayName(), target.getDefinitionKind(), target.getScope(), target.getSymbolTableInclusion(), target.getFile()->getPath());
switch ( kind ) {
case x86::kNoFixUp:
case x86::kFollowOn:
+ case x86::kGroupSubordinate:
return 0;
case x86::kPointer:
sreloc2->set_r_length( (kind==x86::kPointerDiff) ? 2 : 1 );
sreloc2->set_r_type(GENERIC_RELOC_PAIR);
sreloc2->set_r_address(0);
- //if ( &ref->getFromTarget() == &ref->getTarget() )
- sreloc2->set_r_value(ref->getFromTarget().getAddress() + ref->getFromTargetOffset());
- //else
- // sreloc2->set_r_value(ref->getFromTarget().getAddress());
+ sreloc2->set_r_value(ref->getFromTarget().getAddress()+ref->getFromTargetOffset());
fSectionRelocs.push_back(reloc2);
fSectionRelocs.push_back(reloc1);
return 2;
case x86::kPCRel32WeakImport:
case x86::kPCRel32:
case x86::kPCRel16:
+ case x86::kPCRel8:
case x86::kDtraceProbeSite:
case x86::kDtraceIsEnabledSite:
if ( !isExtern && (ref->getTargetOffset() != 0) ) {
// use scattered reloc is target offset is non-zero
sreloc1->set_r_scattered(true);
sreloc1->set_r_pcrel(true);
- sreloc1->set_r_length( (kind==x86::kPCRel16) ? 1 : 2);
+ sreloc1->set_r_length( (kind==x86::kPCRel8) ? 0 : ((kind==x86::kPCRel16) ? 1 : 2) );
sreloc1->set_r_type(GENERIC_RELOC_VANILLA);
sreloc1->set_r_address(address);
sreloc1->set_r_value(target.getAddress());
reloc1.set_r_address(address);
reloc1.set_r_symbolnum(isExtern ? symbolIndex : sectionNum);
reloc1.set_r_pcrel(true);
- reloc1.set_r_length( (kind==x86::kPCRel16) ? 1 : 2);
+ reloc1.set_r_length( (kind==x86::kPCRel8) ? 0 : ((kind==x86::kPCRel16) ? 1 : 2) );
reloc1.set_r_extern(isExtern);
reloc1.set_r_type(GENERIC_RELOC_VANILLA);
}
return 0;
}
+template <>
+uint32_t Writer<arm>::addObjectRelocs(ObjectFile::Atom* atom, ObjectFile::Reference* ref)
+{
+ ObjectFile::Atom& target = ref->getTarget();
+ bool isExtern = this->makesExternalRelocatableReference(target);
+ uint32_t symbolIndex = 0;
+ if ( isExtern )
+ symbolIndex = this->symbolIndex(target);
+ uint32_t sectionNum = target.getSection()->getIndex();
+ uint32_t address = atom->getSectionOffset()+ref->getFixUpOffset();
+ macho_relocation_info<P> reloc1;
+ macho_relocation_info<P> reloc2;
+ macho_scattered_relocation_info<P>* sreloc1 = (macho_scattered_relocation_info<P>*)&reloc1;
+ macho_scattered_relocation_info<P>* sreloc2 = (macho_scattered_relocation_info<P>*)&reloc2;
+ arm::ReferenceKinds kind = (arm::ReferenceKinds)ref->getKind();
+
+ if ( !isExtern && (sectionNum == 0) && (target.getDefinitionKind() != ObjectFile::Atom::kAbsoluteSymbol) )
+ warning("section index == 0 for %s (kind=%d, scope=%d, inclusion=%d) in %s",
+ target.getDisplayName(), target.getDefinitionKind(), target.getScope(), target.getSymbolTableInclusion(), target.getFile()->getPath());
+
+
+ switch ( kind ) {
+ case arm::kNoFixUp:
+ case arm::kFollowOn:
+ case arm::kGroupSubordinate:
+ return 0;
+
+ case arm::kPointer:
+ case arm::kReadOnlyPointer:
+ case arm::kPointerWeakImport:
+ if ( !isExtern && (ref->getTargetOffset() != 0) ) {
+ // use scattered reloc is target offset is non-zero
+ sreloc1->set_r_scattered(true);
+ sreloc1->set_r_pcrel(false);
+ sreloc1->set_r_length(2);
+ sreloc1->set_r_type(ARM_RELOC_VANILLA);
+ sreloc1->set_r_address(address);
+ sreloc1->set_r_value(target.getAddress());
+ }
+ else {
+ reloc1.set_r_address(address);
+ reloc1.set_r_symbolnum(isExtern ? symbolIndex : sectionNum);
+ reloc1.set_r_pcrel(false);
+ reloc1.set_r_length(2);
+ reloc1.set_r_extern(isExtern);
+ reloc1.set_r_type(ARM_RELOC_VANILLA);
+ }
+ fSectionRelocs.push_back(reloc1);
+ return 1;
+
+ case arm::kPointerDiff:
+ {
+ sreloc1->set_r_scattered(true);
+ sreloc1->set_r_pcrel(false);
+ sreloc1->set_r_length(2);
+ if ( ref->getTarget().getScope() == ObjectFile::Atom::scopeTranslationUnit )
+ sreloc1->set_r_type(ARM_RELOC_LOCAL_SECTDIFF);
+ else
+ sreloc1->set_r_type(ARM_RELOC_SECTDIFF);
+ sreloc1->set_r_address(address);
+ sreloc1->set_r_value(target.getAddress());
+ sreloc2->set_r_scattered(true);
+ sreloc2->set_r_pcrel(false);
+ sreloc2->set_r_length(2);
+ sreloc2->set_r_type(ARM_RELOC_PAIR);
+ sreloc2->set_r_address(0);
+ sreloc2->set_r_value(ref->getFromTarget().getAddress()+ref->getFromTargetOffset());
+ fSectionRelocs.push_back(reloc2);
+ fSectionRelocs.push_back(reloc1);
+ return 2;
+ }
+
+ case arm::kBranch24WeakImport:
+ case arm::kBranch24:
+ case arm::kDtraceProbeSite:
+ case arm::kDtraceIsEnabledSite:
+ if ( !isExtern && (ref->getTargetOffset() != 0) ) {
+ // use scattered reloc is target offset is non-zero
+ sreloc1->set_r_scattered(true);
+ sreloc1->set_r_pcrel(true);
+ sreloc1->set_r_length(2);
+ sreloc1->set_r_type(ARM_RELOC_BR24);
+ sreloc1->set_r_address(address);
+ sreloc1->set_r_value(target.getAddress());
+ }
+ else {
+ reloc1.set_r_address(address);
+ reloc1.set_r_symbolnum(isExtern ? symbolIndex : sectionNum);
+ reloc1.set_r_pcrel(true);
+ reloc1.set_r_length(2);
+ reloc1.set_r_extern(isExtern);
+ reloc1.set_r_type(ARM_RELOC_BR24);
+ }
+ fSectionRelocs.push_back(reloc1);
+ return 1;
+
+ case arm::kThumbBranch22WeakImport:
+ case arm::kThumbBranch22:
+ if ( !isExtern && (ref->getTargetOffset() != 0) ) {
+ // use scattered reloc is target offset is non-zero
+ sreloc1->set_r_scattered(true);
+ sreloc1->set_r_pcrel(true);
+ sreloc1->set_r_length(2);
+ sreloc1->set_r_type(ARM_THUMB_RELOC_BR22);
+ sreloc1->set_r_address(address);
+ sreloc1->set_r_value(target.getAddress());
+ }
+ else {
+ reloc1.set_r_address(address);
+ reloc1.set_r_symbolnum(isExtern ? symbolIndex : sectionNum);
+ reloc1.set_r_pcrel(true);
+ reloc1.set_r_length(2);
+ reloc1.set_r_extern(isExtern);
+ reloc1.set_r_type(ARM_THUMB_RELOC_BR22);
+ }
+ fSectionRelocs.push_back(reloc1);
+ return 1;
+ case arm::kDtraceTypeReference:
+ case arm::kDtraceProbe:
+ // generates no relocs
+ return 0;
+ }
+ return 0;
+}
template <> uint64_t Writer<ppc>::maxAddress() { return 0xFFFFFFFFULL; }
template <> uint64_t Writer<ppc64>::maxAddress() { return 0xFFFFFFFFFFFFFFFFULL; }
template <> uint64_t Writer<x86>::maxAddress() { return 0xFFFFFFFFULL; }
template <> uint64_t Writer<x86_64>::maxAddress() { return 0xFFFFFFFFFFFFFFFFULL; }
-
+template <> uint64_t Writer<arm>::maxAddress() { return 0xFFFFFFFFULL; }
template <>
uint8_t Writer<ppc>::getRelocPointerSize()
switch ( kind ) {
case A::kNoFixUp:
case A::kFollowOn:
+ case A::kGroupSubordinate:
return 0;
case A::kPointer:
case A::kPointerDiff32:
case A::kPointerDiff64:
{
- pint_t toAddr = target.getAddress() + ref->getTargetOffset();
- pint_t fromAddr = ref->getFromTarget().getAddress() + ref->getFromTargetOffset();
sreloc1->set_r_scattered(true);
sreloc1->set_r_pcrel(false);
sreloc1->set_r_length( (kind == A::kPointerDiff32) ? 2 : ((kind == A::kPointerDiff64) ? 3 : 1));
- sreloc1->set_r_type(ref->getTargetOffset() != 0 ? PPC_RELOC_LOCAL_SECTDIFF : PPC_RELOC_SECTDIFF);
+ if ( ref->getTarget().getScope() == ObjectFile::Atom::scopeTranslationUnit )
+ sreloc1->set_r_type(PPC_RELOC_LOCAL_SECTDIFF);
+ else
+ sreloc1->set_r_type(PPC_RELOC_SECTDIFF);
sreloc1->set_r_address(address);
- sreloc1->set_r_value(toAddr);
+ sreloc1->set_r_value(target.getAddress());
sreloc2->set_r_scattered(true);
sreloc2->set_r_pcrel(false);
- sreloc1->set_r_length( (kind == A::kPointerDiff32) ? 2 : ((kind == A::kPointerDiff64) ? 3 : 1));
+ sreloc2->set_r_length(sreloc1->r_length());
sreloc2->set_r_type(PPC_RELOC_PAIR);
sreloc2->set_r_address(0);
- sreloc2->set_r_value(fromAddr);
+ sreloc2->set_r_value(ref->getFromTarget().getAddress()+ref->getFromTargetOffset());
fSectionRelocs.push_back(reloc2);
fSectionRelocs.push_back(reloc1);
return 2;
//fprintf(stderr, "buildObjectFileFixups(): starting section %s\n", curSection->fSectionName);
std::vector<ObjectFile::Atom*>& sectionAtoms = curSection->fAtoms;
if ( ! curSection->fAllZeroFill ) {
- if ( curSection->fAllNonLazyPointers || curSection->fAllLazyPointers || curSection->fAllStubs )
+ if ( curSection->fAllNonLazyPointers || curSection->fAllLazyPointers
+ || curSection->fAllLazyDylibPointers || curSection->fAllStubs )
curSection->fIndirectSymbolOffset = fIndirectTableAtom->fTable.size();
curSection->fRelocOffset = relocIndex;
const int atomCount = sectionAtoms.size();
const int refCount = refs.size();
for (int l=0; l < refCount; ++l) {
ObjectFile::Reference* ref = refs[l];
- if ( curSection->fAllNonLazyPointers || curSection->fAllLazyPointers || curSection->fAllStubs ) {
+ if ( curSection->fAllNonLazyPointers || curSection->fAllLazyPointers
+ || curSection->fAllLazyDylibPointers || curSection->fAllStubs ) {
uint32_t offsetInSection = atom->getSectionOffset();
uint32_t indexInSection = offsetInSection / atom->getSize();
uint32_t undefinedSymbolIndex;
ObjectFile::Atom& target = ref->getTarget();
ObjectFile::Atom& fromTarget = ref->getFromTarget();
if ( &fromTarget == NULL ) {
- fprintf(stderr, "lazy pointer %s missing initial binding\n", atom->getDisplayName());
+ warning("lazy pointer %s missing initial binding", atom->getDisplayName());
}
else {
bool isExtern = ( ((target.getDefinitionKind() == ObjectFile::Atom::kExternalDefinition)
return false;
}
+template <>
+bool Writer<arm>::illegalRelocInFinalLinkedImage(const ObjectFile::Reference& ref)
+{
+ if ( ref.getKind() == arm::kReadOnlyPointer ) {
+ switch ( ref.getTarget().getDefinitionKind() ) {
+ case ObjectFile::Atom::kTentativeDefinition:
+ case ObjectFile::Atom::kRegularDefinition:
+ case ObjectFile::Atom::kWeakDefinition:
+ // illegal in dylibs/bundles, until we support TEXT relocs
+ return fSlideable;
+ case ObjectFile::Atom::kExternalDefinition:
+ case ObjectFile::Atom::kExternalWeakDefinition:
+ // illegal until we support TEXT relocs
+ return true;
+ case ObjectFile::Atom::kAbsoluteSymbol:
+ // absolute symbbols only allowed in static executables
+ return ( fOptions.outputKind() != Options::kStaticExecutable);
+ }
+ }
+ return false;
+}
-template <typename A>
-typename Writer<A>::RelocKind Writer<A>::relocationNeededInFinalLinkedImage(const ObjectFile::Atom& target) const
+template <>
+bool Writer<x86>::generatesLocalTextReloc(const ObjectFile::Reference& ref, const ObjectFile::Atom& atom, SectionInfo* atomSection)
{
- switch ( target.getDefinitionKind() ) {
- case ObjectFile::Atom::kTentativeDefinition:
- case ObjectFile::Atom::kRegularDefinition:
- // in main executables, the only way regular symbols are indirected is if -interposable is used
- if ( fOptions.outputKind() == Options::kDynamicExecutable ) {
- if ( this->shouldExport(target) && fOptions.interposable() )
- return kRelocExternal;
- else if ( fSlideable )
- return kRelocInternal;
- else
- return kRelocNone;
- }
- // for flat-namespace or interposable two-level-namespace
- // all references to exported symbols get indirected
- else if ( this->shouldExport(target) &&
- ((fOptions.nameSpace() == Options::kFlatNameSpace)
- || (fOptions.nameSpace() == Options::kForceFlatNameSpace)
- || fOptions.interposable())
+ if ( ref.getKind() == x86::kAbsolute32 ) {
+ switch ( ref.getTarget().getDefinitionKind() ) {
+ case ObjectFile::Atom::kTentativeDefinition:
+ case ObjectFile::Atom::kRegularDefinition:
+ case ObjectFile::Atom::kWeakDefinition:
+ // a reference to the absolute address of something in this same linkage unit can be
+ // encoded as a local text reloc in a dylib or bundle
+ if ( fSlideable ) {
+ macho_relocation_info<P> reloc;
+ SectionInfo* sectInfo = (SectionInfo*)(ref.getTarget().getSection());
+ reloc.set_r_address(this->relocAddressInFinalLinkedImage(atom.getAddress() + ref.getFixUpOffset(), &atom));
+ reloc.set_r_symbolnum(sectInfo->getIndex());
+ reloc.set_r_pcrel(false);
+ reloc.set_r_length();
+ reloc.set_r_extern(false);
+ reloc.set_r_type(GENERIC_RELOC_VANILLA);
+ fInternalRelocs.push_back(reloc);
+ atomSection->fHasTextLocalRelocs = true;
+ return true;
+ }
+ return false;
+ case ObjectFile::Atom::kExternalDefinition:
+ case ObjectFile::Atom::kExternalWeakDefinition:
+ case ObjectFile::Atom::kAbsoluteSymbol:
+ return false;
+ }
+ }
+ return false;
+}
+
+template <>
+bool Writer<ppc>::generatesLocalTextReloc(const ObjectFile::Reference& ref, const ObjectFile::Atom& atom, SectionInfo* atomSection)
+{
+ macho_relocation_info<P> reloc1;
+ macho_relocation_info<P> reloc2;
+ switch ( ref.getTarget().getDefinitionKind() ) {
+ case ObjectFile::Atom::kTentativeDefinition:
+ case ObjectFile::Atom::kRegularDefinition:
+ case ObjectFile::Atom::kWeakDefinition:
+ switch ( ref.getKind() ) {
+ case ppc::kAbsLow16:
+ case ppc::kAbsLow14:
+ // a reference to the absolute address of something in this same linkage unit can be
+ // encoded as a local text reloc in a dylib or bundle
+ if ( fSlideable ) {
+ SectionInfo* sectInfo = (SectionInfo*)(ref.getTarget().getSection());
+ uint32_t targetAddr = ref.getTarget().getAddress() + ref.getTargetOffset();
+ reloc1.set_r_address(this->relocAddressInFinalLinkedImage(atom.getAddress() + ref.getFixUpOffset(), &atom));
+ reloc1.set_r_symbolnum(sectInfo->getIndex());
+ reloc1.set_r_pcrel(false);
+ reloc1.set_r_length(2);
+ reloc1.set_r_extern(false);
+ reloc1.set_r_type(ref.getKind()==ppc::kAbsLow16 ? PPC_RELOC_LO16 : PPC_RELOC_LO14);
+ reloc2.set_r_address(targetAddr >> 16);
+ reloc2.set_r_symbolnum(0);
+ reloc2.set_r_pcrel(false);
+ reloc2.set_r_length(2);
+ reloc2.set_r_extern(false);
+ reloc2.set_r_type(PPC_RELOC_PAIR);
+ fInternalRelocs.push_back(reloc1);
+ fInternalRelocs.push_back(reloc2);
+ atomSection->fHasTextLocalRelocs = true;
+ return true;
+ }
+ break;
+ case ppc::kAbsHigh16:
+ case ppc::kAbsHigh16AddLow:
+ if ( fSlideable ) {
+ SectionInfo* sectInfo = (SectionInfo*)(ref.getTarget().getSection());
+ uint32_t targetAddr = ref.getTarget().getAddress() + ref.getTargetOffset();
+ reloc1.set_r_address(this->relocAddressInFinalLinkedImage(atom.getAddress() + ref.getFixUpOffset(), &atom));
+ reloc1.set_r_symbolnum(sectInfo->getIndex());
+ reloc1.set_r_pcrel(false);
+ reloc1.set_r_length(2);
+ reloc1.set_r_extern(false);
+ reloc1.set_r_type(ref.getKind()==ppc::kAbsHigh16AddLow ? PPC_RELOC_HA16 : PPC_RELOC_HI16);
+ reloc2.set_r_address(targetAddr & 0xFFFF);
+ reloc2.set_r_symbolnum(0);
+ reloc2.set_r_pcrel(false);
+ reloc2.set_r_length(2);
+ reloc2.set_r_extern(false);
+ reloc2.set_r_type(PPC_RELOC_PAIR);
+ fInternalRelocs.push_back(reloc1);
+ fInternalRelocs.push_back(reloc2);
+ atomSection->fHasTextLocalRelocs = true;
+ return true;
+ }
+ }
+ break;
+ case ObjectFile::Atom::kExternalDefinition:
+ case ObjectFile::Atom::kExternalWeakDefinition:
+ case ObjectFile::Atom::kAbsoluteSymbol:
+ return false;
+ }
+ return false;
+}
+
+template <>
+bool Writer<arm>::generatesLocalTextReloc(const ObjectFile::Reference& ref, const ObjectFile::Atom& atom, SectionInfo* atomSection)
+{
+ if ( ref.getKind() == arm::kReadOnlyPointer ) {
+ switch ( ref.getTarget().getDefinitionKind() ) {
+ case ObjectFile::Atom::kTentativeDefinition:
+ case ObjectFile::Atom::kRegularDefinition:
+ case ObjectFile::Atom::kWeakDefinition:
+ // a reference to the absolute address of something in this same linkage unit can be
+ // encoded as a local text reloc in a dylib or bundle
+ if ( fSlideable ) {
+ macho_relocation_info<P> reloc;
+ SectionInfo* sectInfo = (SectionInfo*)(ref.getTarget().getSection());
+ reloc.set_r_address(this->relocAddressInFinalLinkedImage(atom.getAddress() + ref.getFixUpOffset(), &atom));
+ reloc.set_r_symbolnum(sectInfo->getIndex());
+ reloc.set_r_pcrel(false);
+ reloc.set_r_length();
+ reloc.set_r_extern(false);
+ reloc.set_r_type(GENERIC_RELOC_VANILLA);
+ fInternalRelocs.push_back(reloc);
+ atomSection->fHasTextLocalRelocs = true;
+ return true;
+ }
+ return false;
+ case ObjectFile::Atom::kExternalDefinition:
+ case ObjectFile::Atom::kExternalWeakDefinition:
+ case ObjectFile::Atom::kAbsoluteSymbol:
+ return false;
+ }
+ }
+ return false;
+}
+
+
+template <>
+bool Writer<x86_64>::generatesLocalTextReloc(const ObjectFile::Reference&, const ObjectFile::Atom& atom, SectionInfo* curSection)
+{
+ // text relocs not supported (usually never needed because of RIP addressing)
+ return false;
+}
+
+template <>
+bool Writer<ppc64>::generatesLocalTextReloc(const ObjectFile::Reference&, const ObjectFile::Atom& atom, SectionInfo* curSection)
+{
+ // text relocs not supported
+ return false;
+}
+
+template <>
+bool Writer<x86>::generatesExternalTextReloc(const ObjectFile::Reference& ref, const ObjectFile::Atom& atom, SectionInfo* atomSection)
+{
+ if ( ref.getKind() == x86::kAbsolute32 ) {
+ macho_relocation_info<P> reloc;
+ switch ( ref.getTarget().getDefinitionKind() ) {
+ case ObjectFile::Atom::kTentativeDefinition:
+ case ObjectFile::Atom::kRegularDefinition:
+ case ObjectFile::Atom::kWeakDefinition:
+ return false;
+ case ObjectFile::Atom::kExternalDefinition:
+ case ObjectFile::Atom::kExternalWeakDefinition:
+ // a reference to the absolute address of something in another linkage unit can be
+ // encoded as an external text reloc in a dylib or bundle
+ reloc.set_r_address(this->relocAddressInFinalLinkedImage(atom.getAddress() + ref.getFixUpOffset(), &atom));
+ reloc.set_r_symbolnum(this->symbolIndex(ref.getTarget()));
+ reloc.set_r_pcrel(false);
+ reloc.set_r_length();
+ reloc.set_r_extern(true);
+ reloc.set_r_type(GENERIC_RELOC_VANILLA);
+ fExternalRelocs.push_back(reloc);
+ atomSection->fHasTextExternalRelocs = true;
+ return true;
+ case ObjectFile::Atom::kAbsoluteSymbol:
+ return false;
+ }
+ }
+ return false;
+}
+
+template <typename A>
+bool Writer<A>::generatesExternalTextReloc(const ObjectFile::Reference&, const ObjectFile::Atom& atom, SectionInfo* curSection)
+{
+ return false;
+}
+
+
+
+
+template <typename A>
+typename Writer<A>::RelocKind Writer<A>::relocationNeededInFinalLinkedImage(const ObjectFile::Atom& target) const
+{
+ switch ( target.getDefinitionKind() ) {
+ case ObjectFile::Atom::kTentativeDefinition:
+ case ObjectFile::Atom::kRegularDefinition:
+ // in main executables, the only way regular symbols are indirected is if -interposable is used
+ if ( fOptions.outputKind() == Options::kDynamicExecutable ) {
+ if ( this->shouldExport(target) && fOptions.interposable(target.getName()) )
+ return kRelocExternal;
+ else if ( fSlideable )
+ return kRelocInternal;
+ else
+ return kRelocNone;
+ }
+ // for flat-namespace or interposable two-level-namespace
+ // all references to exported symbols get indirected
+ else if ( this->shouldExport(target) &&
+ ((fOptions.nameSpace() == Options::kFlatNameSpace)
+ || (fOptions.nameSpace() == Options::kForceFlatNameSpace)
+ || fOptions.interposable(target.getName()))
&& (target.getName() != NULL)
&& (strncmp(target.getName(), ".objc_class_", 12) != 0) ) // <rdar://problem/5254468>
return kRelocExternal;
template <> bool Writer<ppc64>::preboundLazyPointerType(uint8_t* type) { throw "prebinding not supported"; }
template <> bool Writer<x86>::preboundLazyPointerType(uint8_t* type) { *type = GENERIC_RELOC_PB_LA_PTR; return true; }
template <> bool Writer<x86_64>::preboundLazyPointerType(uint8_t* type) { throw "prebinding not supported"; }
-
+template <> bool Writer<arm>::preboundLazyPointerType(uint8_t* type) { *type = ARM_RELOC_PB_LA_PTR; return true; }
template <typename A>
void Writer<A>::buildExecutableFixups()
//fprintf(stderr, "starting section %s\n", curSection->fSectionName);
std::vector<ObjectFile::Atom*>& sectionAtoms = curSection->fAtoms;
if ( ! curSection->fAllZeroFill ) {
- if ( curSection->fAllNonLazyPointers || curSection->fAllLazyPointers || curSection->fAllStubs || curSection->fAllSelfModifyingStubs )
+ if ( curSection->fAllNonLazyPointers || curSection->fAllLazyPointers || curSection->fAllLazyDylibPointers
+ || curSection->fAllStubs || curSection->fAllSelfModifyingStubs )
curSection->fIndirectSymbolOffset = fIndirectTableAtom->fTable.size();
const int atomCount = sectionAtoms.size();
for (int k=0; k < atomCount; ++k) {
//fprintf(stderr, "atom %s has %d references in section %s, %p\n", atom->getDisplayName(), refCount, curSection->fSectionName, atom->getSection());
for (int l=0; l < refCount; ++l) {
ObjectFile::Reference* ref = refs[l];
- if ( curSection->fAllNonLazyPointers || curSection->fAllLazyPointers ) {
+ if ( curSection->fAllNonLazyPointers || curSection->fAllLazyPointers || curSection->fAllLazyDylibPointers ) {
// if atom is in (non)lazy_pointer section, this is encoded as an indirect symbol
if ( atom->getSize() != sizeof(pint_t) ) {
- printf("wrong size pointer atom %s from file %s\n", atom->getDisplayName(), atom->getFile()->getPath());
+ warning("wrong size pointer atom %s from file %s", atom->getDisplayName(), atom->getFile()->getPath());
}
ObjectFile::Atom* pointerTarget = &(ref->getTarget());
- if ( curSection->fAllLazyPointers ) {
+ if ( curSection->fAllLazyPointers || curSection->fAllLazyDylibPointers ) {
pointerTarget = ((LazyPointerAtom<A>*)atom)->getTarget();
}
uint32_t offsetInSection = atom->getSectionOffset();
undefinedSymbolIndex = this->symbolIndex(*pointerTarget);
uint32_t indirectTableIndex = indexInSection + curSection->fIndirectSymbolOffset;
IndirectEntry entry = { indirectTableIndex, undefinedSymbolIndex };
- //fprintf(stderr,"fIndirectTableAtom->fTable.add(%d-%d => 0x%X-%s), size=%lld\n", indexInSection, indirectTableIndex, undefinedSymbolIndex, ref->getTarget().getName(), atom->getSize());
+ //fprintf(stderr,"fIndirectTableAtom->fTable.push_back(tableIndex=%d, symIndex=0x%X), pointerTarget=%s\n",
+ // indirectTableIndex, undefinedSymbolIndex, pointerTarget->getDisplayName());
fIndirectTableAtom->fTable.push_back(entry);
- if ( curSection->fAllLazyPointers ) {
+ if ( curSection->fAllLazyPointers || curSection->fAllLazyDylibPointers ) {
uint8_t preboundLazyType;
- if ( fOptions.prebind() && (fDyldHelper != NULL) && preboundLazyPointerType(&preboundLazyType) ) {
+ if ( fOptions.prebind() && (fDyldHelper != NULL)
+ && curSection->fAllLazyPointers && preboundLazyPointerType(&preboundLazyType) ) {
// this is a prebound image, need special relocs for dyld to reset lazy pointers if prebinding is invalid
macho_scattered_relocation_info<P> pblaReloc;
pblaReloc.set_r_scattered(true);
}
}
else if ( this->illegalRelocInFinalLinkedImage(*ref) ) {
- throwf("absolute addressing (perhaps -mdynamic-no-pic) used in %s from %s not allowed in slidable image", atom->getDisplayName(), atom->getFile()->getPath());
+ if ( fOptions.allowTextRelocs() && !atom->getSegment().isContentWritable() ) {
+ if ( fOptions.warnAboutTextRelocs() )
+ warning("text reloc in %s to %s", atom->getDisplayName(), ref->getTargetName());
+ if ( this->generatesLocalTextReloc(*ref, *atom, curSection) ) {
+ // relocs added to fInternalRelocs
+ }
+ else if ( this->generatesExternalTextReloc(*ref, *atom, curSection) ) {
+ // relocs added to fExternalRelocs
+ }
+ else {
+ throwf("relocation used in %s from %s not allowed in slidable image", atom->getDisplayName(), atom->getFile()->getPath());
+ }
+ }
+ else {
+ throwf("absolute addressing (perhaps -mdynamic-no-pic) used in %s from %s not allowed in slidable image. "
+ "Use '-read_only_relocs suppress' to enable text relocs", atom->getDisplayName(), atom->getFile()->getPath());
+ }
}
}
if ( curSection->fAllSelfModifyingStubs || curSection->fAllStubs ) {
fSplitCodeToDataContentAtom->add64bitPointerLocation(atom, ref->getFixUpOffset());
break;
case ppc::kNoFixUp:
+ case ppc::kGroupSubordinate:
case ppc::kPointer:
case ppc::kPointerWeakImport:
case ppc::kPICBaseLow16:
// ignore
break;
default:
- fprintf(stderr, "ld: warning codegen with reference kind %d in %s prevents image from loading in dyld shared cache\n", ref->getKind(), atom->getDisplayName());
+ warning("codegen with reference kind %d in %s prevents image from loading in dyld shared cache", ref->getKind(), atom->getDisplayName());
fSplitCodeToDataContentAtom->setCantEncode();
}
}
fSplitCodeToDataContentAtom->add64bitPointerLocation(atom, ref->getFixUpOffset());
break;
case ppc64::kNoFixUp:
+ case ppc64::kGroupSubordinate:
case ppc64::kPointer:
case ppc64::kPointerWeakImport:
case ppc64::kPICBaseLow16:
// ignore
break;
default:
- fprintf(stderr, "ld: warning codegen with reference kind %d in %s prevents image from loading in dyld shared cache\n", ref->getKind(), atom->getDisplayName());
+ warning("codegen with reference kind %d in %s prevents image from loading in dyld shared cache", ref->getKind(), atom->getDisplayName());
fSplitCodeToDataContentAtom->setCantEncode();
}
}
fSplitCodeToDataContentAtom->add32bitPointerLocation(atom, ref->getFixUpOffset());
break;
case x86::kNoFixUp:
+ case x86::kGroupSubordinate:
case x86::kPointer:
case x86::kPointerWeakImport:
// ignore
}
// fall into warning case
default:
- fprintf(stderr, "ld: warning codegen in %s (offset 0x%08llX) prevents image from loading in dyld shared cache\n", atom->getDisplayName(), ref->getFixUpOffset());
+ warning("codegen in %s (offset 0x%08llX) prevents image from loading in dyld shared cache", atom->getDisplayName(), ref->getFixUpOffset());
fSplitCodeToDataContentAtom->setCantEncode();
}
}
fSplitCodeToDataContentAtom->add64bitPointerLocation(atom, ref->getFixUpOffset());
break;
case x86_64::kNoFixUp:
+ case x86_64::kGroupSubordinate:
case x86_64::kPointer:
// ignore
break;
default:
- fprintf(stderr, "ld: warning codegen in %s with kind %d prevents image from loading in dyld shared cache\n", atom->getDisplayName(), ref->getKind());
+ warning("codegen in %s with kind %d prevents image from loading in dyld shared cache", atom->getDisplayName(), ref->getKind());
fSplitCodeToDataContentAtom->setCantEncode();
}
}
+template <>
+void Writer<arm>::addCrossSegmentRef(const ObjectFile::Atom* atom, const ObjectFile::Reference* ref)
+{
+ switch ( (arm::ReferenceKinds)ref->getKind() ) {
+ case arm::kPointerDiff:
+ fSplitCodeToDataContentAtom->add32bitPointerLocation(atom, ref->getFixUpOffset());
+ break;
+ case arm::kNoFixUp:
+ case arm::kGroupSubordinate:
+ case arm::kPointer:
+ case arm::kPointerWeakImport:
+ case arm::kReadOnlyPointer:
+ // ignore
+ break;
+ default:
+ warning("codegen in %s prevents image from loading in dyld shared cache", atom->getDisplayName());
+ fSplitCodeToDataContentAtom->setCantEncode();
+ }
+}
template <typename A>
bool Writer<A>::segmentsCanSplitApart(const ObjectFile::Atom& from, const ObjectFile::Atom& to)
template <>
-void Writer<ppc>::writeNoOps(uint32_t from, uint32_t to)
+void Writer<ppc>::writeNoOps(int fd, uint32_t from, uint32_t to)
{
uint32_t ppcNop;
OSWriteBigInt32(&ppcNop, 0, 0x60000000);
for (uint32_t p=from; p < to; p += 4)
- ::pwrite(fFileDescriptor, &ppcNop, 4, p);
+ ::pwrite(fd, &ppcNop, 4, p);
}
template <>
-void Writer<ppc64>::writeNoOps(uint32_t from, uint32_t to)
+void Writer<ppc64>::writeNoOps(int fd, uint32_t from, uint32_t to)
{
uint32_t ppcNop;
OSWriteBigInt32(&ppcNop, 0, 0x60000000);
for (uint32_t p=from; p < to; p += 4)
- ::pwrite(fFileDescriptor, &ppcNop, 4, p);
+ ::pwrite(fd, &ppcNop, 4, p);
}
template <>
-void Writer<x86>::writeNoOps(uint32_t from, uint32_t to)
+void Writer<x86>::writeNoOps(int fd, uint32_t from, uint32_t to)
{
uint8_t x86Nop = 0x90;
for (uint32_t p=from; p < to; ++p)
- ::pwrite(fFileDescriptor, &x86Nop, 1, p);
+ ::pwrite(fd, &x86Nop, 1, p);
}
template <>
-void Writer<x86_64>::writeNoOps(uint32_t from, uint32_t to)
+void Writer<x86_64>::writeNoOps(int fd, uint32_t from, uint32_t to)
{
uint8_t x86Nop = 0x90;
for (uint32_t p=from; p < to; ++p)
- ::pwrite(fFileDescriptor, &x86Nop, 1, p);
+ ::pwrite(fd, &x86Nop, 1, p);
}
+template <>
+void Writer<arm>::writeNoOps(int fd, uint32_t from, uint32_t to)
+{
+ // FIXME: need thumb nop?
+ uint32_t armNop;
+ OSWriteLittleInt32(&armNop, 0, 0xe1a00000);
+ for (uint32_t p=from; p < to; p += 4)
+ ::pwrite(fd, &armNop, 4, p);
+}
template <>
void Writer<ppc>::copyNoOps(uint8_t* from, uint8_t* to)
*p = 0x90;
}
+template <>
+void Writer<arm>::copyNoOps(uint8_t* from, uint8_t* to)
+{
+ // fixme: need thumb nop?
+ for (uint8_t* p=from; p < to; p += 4)
+ OSWriteBigInt32((uint32_t*)p, 0, 0xe1a00000);
+}
static const char* stringName(const char* str)
{
template <> const char* Writer<ppc64>::getArchString() { return "ppc64"; }
template <> const char* Writer<x86>::getArchString() { return "i386"; }
template <> const char* Writer<x86_64>::getArchString() { return "x86_64"; }
+template <> const char* Writer<arm>::getArchString() { return "arm"; }
template <typename A>
void Writer<A>::writeMap()
fclose(mapFile);
}
else {
- fprintf(stderr, "ld: warning could not write map file: %s\n", fOptions.generatedMapPath());
+ warning("could not write map file: %s\n", fOptions.generatedMapPath());
}
}
}
+static const char* sCleanupFile = NULL;
+static void cleanup(int sig)
+{
+ ::signal(sig, SIG_DFL);
+ if ( sCleanupFile != NULL ) {
+ ::unlink(sCleanupFile);
+ }
+ if ( sig == SIGINT )
+ ::exit(1);
+}
+
+
template <typename A>
uint64_t Writer<A>::writeAtoms()
{
+ // for UNIX conformance, error if file exists and is not writable
+ if ( (access(fFilePath, F_OK) == 0) && (access(fFilePath, W_OK) == -1) )
+ throwf("can't write output file: %s", fFilePath);
+
+ int permissions = 0777;
+ if ( fOptions.outputKind() == Options::kObjectFile )
+ permissions = 0666;
+ // Calling unlink first assures the file is gone so that open creates it with correct permissions
+ // It also handles the case where fFilePath file is not writable but its directory is
+ // And it means we don't have to truncate the file when done writing (in case new is smaller than old)
+ (void)unlink(fFilePath);
+
// try to allocate buffer for entire output file content
+ int fd = -1;
SectionInfo* lastSection = fSegmentInfos.back()->fSections.back();
uint64_t fileBufferSize = (lastSection->fFileOffset + lastSection->fSize + 4095) & (-4096);
uint8_t* wholeBuffer = (uint8_t*)calloc(fileBufferSize, 1);
uint8_t* atomBuffer = NULL;
bool streaming = false;
if ( wholeBuffer == NULL ) {
+ fd = open(fFilePath, O_CREAT | O_WRONLY | O_TRUNC, permissions);
+ if ( fd == -1 )
+ throwf("can't open output file for writing: %s, errno=%d", fFilePath, errno);
atomBuffer = new uint8_t[(fLargestAtomSize+4095) & (-4096)];
streaming = true;
+ // install signal handlers to delete output file if program is killed
+ sCleanupFile = fFilePath;
+ ::signal(SIGINT, cleanup);
+ ::signal(SIGBUS, cleanup);
+ ::signal(SIGSEGV, cleanup);
}
uint32_t size = 0;
uint32_t end = 0;
- for (std::vector<SegmentInfo*>::iterator segit = fSegmentInfos.begin(); segit != fSegmentInfos.end(); ++segit) {
- SegmentInfo* curSegment = *segit;
- bool isTextSeg = (strcmp(curSegment->fName, "__TEXT") == 0);
- std::vector<SectionInfo*>& sectionInfos = curSegment->fSections;
- for (std::vector<SectionInfo*>::iterator secit = sectionInfos.begin(); secit != sectionInfos.end(); ++secit) {
- SectionInfo* curSection = *secit;
- std::vector<ObjectFile::Atom*>& sectionAtoms = curSection->fAtoms;
- //printf("writing with max atom size 0x%X\n", fLargestAtomSize);
- //fprintf(stderr, "writing %d atoms for section %s\n", (int)sectionAtoms.size(), curSection->fSectionName);
- if ( ! curSection->fAllZeroFill ) {
- end = curSection->fFileOffset;
- bool needsNops = isTextSeg && (strcmp(curSection->fSectionName, "__cstring") != 0);
- for (std::vector<ObjectFile::Atom*>::iterator ait = sectionAtoms.begin(); ait != sectionAtoms.end(); ++ait) {
- ObjectFile::Atom* atom = *ait;
- if ( (atom->getDefinitionKind() != ObjectFile::Atom::kExternalDefinition)
- && (atom->getDefinitionKind() != ObjectFile::Atom::kExternalWeakDefinition)
- && (atom->getDefinitionKind() != ObjectFile::Atom::kAbsoluteSymbol) ) {
- uint32_t fileOffset = curSection->fFileOffset + atom->getSectionOffset();
- if ( fileOffset != end ) {
- if ( needsNops ) {
- // fill gaps with no-ops
- if ( streaming )
- writeNoOps(end, fileOffset);
- else
- copyNoOps(&wholeBuffer[end], &wholeBuffer[fileOffset]);
- }
- else if ( streaming ) {
- // zero fill gaps
- if ( (fileOffset-end) == 4 ) {
- uint32_t zero = 0;
- ::pwrite(fFileDescriptor, &zero, 4, end);
+ try {
+ for (std::vector<SegmentInfo*>::iterator segit = fSegmentInfos.begin(); segit != fSegmentInfos.end(); ++segit) {
+ SegmentInfo* curSegment = *segit;
+ bool isTextSeg = (strcmp(curSegment->fName, "__TEXT") == 0);
+ std::vector<SectionInfo*>& sectionInfos = curSegment->fSections;
+ for (std::vector<SectionInfo*>::iterator secit = sectionInfos.begin(); secit != sectionInfos.end(); ++secit) {
+ SectionInfo* curSection = *secit;
+ std::vector<ObjectFile::Atom*>& sectionAtoms = curSection->fAtoms;
+ //printf("writing with max atom size 0x%X\n", fLargestAtomSize);
+ //fprintf(stderr, "writing %lu atoms for section %s\n", sectionAtoms.size(), curSection->fSectionName);
+ if ( ! curSection->fAllZeroFill ) {
+ end = curSection->fFileOffset;
+ bool needsNops = isTextSeg && (strcmp(curSection->fSectionName, "__cstring") != 0);
+ for (std::vector<ObjectFile::Atom*>::iterator ait = sectionAtoms.begin(); ait != sectionAtoms.end(); ++ait) {
+ ObjectFile::Atom* atom = *ait;
+ if ( (atom->getDefinitionKind() != ObjectFile::Atom::kExternalDefinition)
+ && (atom->getDefinitionKind() != ObjectFile::Atom::kExternalWeakDefinition)
+ && (atom->getDefinitionKind() != ObjectFile::Atom::kAbsoluteSymbol) ) {
+ uint32_t fileOffset = curSection->fFileOffset + atom->getSectionOffset();
+ if ( fileOffset != end ) {
+ if ( needsNops ) {
+ // fill gaps with no-ops
+ if ( streaming )
+ writeNoOps(fd, end, fileOffset);
+ else
+ copyNoOps(&wholeBuffer[end], &wholeBuffer[fileOffset]);
}
- else {
- uint8_t zero = 0x00;
- for (uint32_t p=end; p < fileOffset; ++p)
- ::pwrite(fFileDescriptor, &zero, 1, p);
+ else if ( streaming ) {
+ // zero fill gaps
+ if ( (fileOffset-end) == 4 ) {
+ uint32_t zero = 0;
+ ::pwrite(fd, &zero, 4, end);
+ }
+ else {
+ uint8_t zero = 0x00;
+ for (uint32_t p=end; p < fileOffset; ++p)
+ ::pwrite(fd, &zero, 1, p);
+ }
}
}
- }
- uint64_t atomSize = atom->getSize();
- if ( streaming ) {
- if ( atomSize > fLargestAtomSize )
- throwf("ld64 internal error: atom \"%s\"is larger than expected 0x%X > 0x%llX",
- atom->getDisplayName(), atomSize, fLargestAtomSize);
- }
- else {
- if ( fileOffset > fileBufferSize )
- throwf("ld64 internal error: atom \"%s\" has file offset greater thatn expceted 0x%X > 0x%llX",
- atom->getDisplayName(), fileOffset, fileBufferSize);
- }
- uint8_t* buffer = streaming ? atomBuffer : &wholeBuffer[fileOffset];
- end = fileOffset+atomSize;
- // copy raw bytes
- atom->copyRawContent(buffer);
- // apply any fix-ups
- try {
- std::vector<ObjectFile::Reference*>& references = atom->getReferences();
- for (std::vector<ObjectFile::Reference*>::iterator it=references.begin(); it != references.end(); it++) {
- ObjectFile::Reference* ref = *it;
- if ( fOptions.outputKind() == Options::kObjectFile ) {
- // doing ld -r
- // skip fix-ups for undefined targets
- if ( &(ref->getTarget()) != NULL )
- this->fixUpReferenceRelocatable(ref, atom, buffer);
- }
- else {
- // producing final linked image
- this->fixUpReferenceFinal(ref, atom, buffer);
+ uint64_t atomSize = atom->getSize();
+ if ( streaming ) {
+ if ( atomSize > fLargestAtomSize )
+ throwf("ld64 internal error: atom \"%s\"is larger than expected 0x%X > 0x%llX",
+ atom->getDisplayName(), atomSize, fLargestAtomSize);
+ }
+ else {
+ if ( fileOffset > fileBufferSize )
+ throwf("ld64 internal error: atom \"%s\" has file offset greater thatn expceted 0x%X > 0x%llX",
+ atom->getDisplayName(), fileOffset, fileBufferSize);
+ }
+ uint8_t* buffer = streaming ? atomBuffer : &wholeBuffer[fileOffset];
+ end = fileOffset+atomSize;
+ // copy raw bytes
+ atom->copyRawContent(buffer);
+ // apply any fix-ups
+ try {
+ std::vector<ObjectFile::Reference*>& references = atom->getReferences();
+ for (std::vector<ObjectFile::Reference*>::iterator it=references.begin(); it != references.end(); it++) {
+ ObjectFile::Reference* ref = *it;
+ if ( fOptions.outputKind() == Options::kObjectFile ) {
+ // doing ld -r
+ // skip fix-ups for undefined targets
+ if ( &(ref->getTarget()) != NULL )
+ this->fixUpReferenceRelocatable(ref, atom, buffer);
+ }
+ else {
+ // producing final linked image
+ this->fixUpReferenceFinal(ref, atom, buffer);
+ }
}
}
+ catch (const char* msg) {
+ throwf("%s in %s from %s", msg, atom->getDisplayName(), atom->getFile()->getPath());
+ }
+ //fprintf(stderr, "writing 0x%08X -> 0x%08X (addr=0x%llX, size=0x%llX), atom %s from %s\n",
+ // fileOffset, end, atom->getAddress(), atom->getSize(), atom->getDisplayName(), atom->getFile()->getPath());
+ if ( streaming ) {
+ // write out
+ ::pwrite(fd, buffer, atomSize, fileOffset);
+ }
+ else {
+ if ( (fileOffset + atomSize) > size )
+ size = fileOffset + atomSize;
+ }
}
- catch (const char* msg) {
- throwf("%s in %s from %s", msg, atom->getDisplayName(), atom->getFile()->getPath());
- }
- //fprintf(stderr, "writing 0x%08X -> 0x%08X (addr=0x%llX, size=0x%llX), atom %s from %s\n",
- // fileOffset, end, atom->getAddress(), atom->getSize(), atom->getDisplayName(), atom->getFile()->getPath());
- if ( streaming ) {
- // write out
- ::pwrite(fFileDescriptor, buffer, atomSize, fileOffset);
- }
- else {
- if ( (fileOffset + atomSize) > size )
- size = fileOffset + atomSize;
- }
}
}
}
- }
- }
-
- // update content based UUID
- if ( fOptions.getUUIDMode() == Options::kUUIDContent ) {
- uint8_t digest[CC_MD5_DIGEST_LENGTH];
- if ( streaming ) {
- // if output file file did not fit in memory, re-read file to generate md5 hash
- uint32_t kMD5BufferSize = 16*1024;
- uint8_t* md5Buffer = (uint8_t*)::malloc(kMD5BufferSize);
- if ( md5Buffer != NULL ) {
- CC_MD5_CTX md5State;
- CC_MD5_Init(&md5State);
- ::lseek(fFileDescriptor, 0, SEEK_SET);
- ssize_t len;
- while ( (len = ::read(fFileDescriptor, md5Buffer, kMD5BufferSize)) > 0 )
- CC_MD5_Update(&md5State, md5Buffer, len);
- CC_MD5_Final(digest, &md5State);
- ::free(md5Buffer);
+ }
+
+ // update content based UUID
+ if ( fOptions.getUUIDMode() == Options::kUUIDContent ) {
+ uint8_t digest[CC_MD5_DIGEST_LENGTH];
+ if ( streaming ) {
+ // if output file file did not fit in memory, re-read file to generate md5 hash
+ uint32_t kMD5BufferSize = 16*1024;
+ uint8_t* md5Buffer = (uint8_t*)::malloc(kMD5BufferSize);
+ if ( md5Buffer != NULL ) {
+ CC_MD5_CTX md5State;
+ CC_MD5_Init(&md5State);
+ ::lseek(fd, 0, SEEK_SET);
+ ssize_t len;
+ while ( (len = ::read(fd, md5Buffer, kMD5BufferSize)) > 0 )
+ CC_MD5_Update(&md5State, md5Buffer, len);
+ CC_MD5_Final(digest, &md5State);
+ ::free(md5Buffer);
+ }
+ else {
+ // if malloc fails, fall back to random uuid
+ ::uuid_generate_random(digest);
+ }
+ fUUIDAtom->setContent(digest);
+ uint32_t uuidOffset = ((SectionInfo*)fUUIDAtom->getSection())->fFileOffset + fUUIDAtom->getSectionOffset();
+ fUUIDAtom->copyRawContent(atomBuffer);
+ ::pwrite(fd, atomBuffer, fUUIDAtom->getSize(), uuidOffset);
+ }
+ else {
+ // if output file fit in memory, just genrate an md5 hash in memory
+ #if 1
+ // temp hack for building on Tiger
+ CC_MD5_CTX md5State;
+ CC_MD5_Init(&md5State);
+ CC_MD5_Update(&md5State, wholeBuffer, size);
+ CC_MD5_Final(digest, &md5State);
+ #else
+ CC_MD5(wholeBuffer, size, digest);
+ #endif
+ fUUIDAtom->setContent(digest);
+ uint32_t uuidOffset = ((SectionInfo*)fUUIDAtom->getSection())->fFileOffset + fUUIDAtom->getSectionOffset();
+ fUUIDAtom->copyRawContent(&wholeBuffer[uuidOffset]);
+ }
+ }
+ }
+ catch (...) {
+ if ( sCleanupFile != NULL )
+ ::unlink(sCleanupFile);
+ throw;
+ }
+
+ // finish up
+ if ( streaming ) {
+ delete [] atomBuffer;
+ close(fd);
+ // restore default signal handlers
+ sCleanupFile = NULL;
+ ::signal(SIGINT, SIG_DFL);
+ ::signal(SIGBUS, SIG_DFL);
+ ::signal(SIGSEGV, SIG_DFL);
+ }
+ else {
+ // write whole output file in one chunk
+ fd = open(fFilePath, O_CREAT | O_WRONLY | O_TRUNC, permissions);
+ if ( fd == -1 )
+ throwf("can't open output file for writing: %s, errno=%d", fFilePath, errno);
+ ::pwrite(fd, wholeBuffer, size, 0);
+ close(fd);
+ delete [] wholeBuffer;
+ }
+
+ return end;
+}
+
+template <>
+void Writer<arm>::fixUpReferenceFinal(const ObjectFile::Reference* ref, const ObjectFile::Atom* inAtom, uint8_t buffer[]) const
+{
+ int64_t displacement;
+ int64_t baseAddr;
+ uint32_t instruction;
+ uint32_t newInstruction;
+ uint64_t targetAddr = 0;
+ uint32_t firstDisp;
+ uint32_t nextDisp;
+ uint32_t opcode;
+ bool relocateableExternal = false;
+ bool is_bl;
+ bool is_blx;
+ bool targetIsThumb;
+
+ if ( ref->getTargetBinding() != ObjectFile::Reference::kDontBind ) {
+ targetAddr = ref->getTarget().getAddress() + ref->getTargetOffset();
+ relocateableExternal = (relocationNeededInFinalLinkedImage(ref->getTarget()) == kRelocExternal);
+ }
+
+ uint32_t* fixUp = (uint32_t*)&buffer[ref->getFixUpOffset()];
+ switch ( (arm::ReferenceKinds)(ref->getKind()) ) {
+ case arm::kNoFixUp:
+ case arm::kFollowOn:
+ case arm::kGroupSubordinate:
+ // do nothing
+ break;
+ case arm::kPointerWeakImport:
+ case arm::kPointer:
+ // If this is the lazy pointers section, then set all lazy pointers to
+ // point to the dyld stub binding helper.
+ if ( ((SectionInfo*)inAtom->getSection())->fAllLazyPointers
+ || ((SectionInfo*)inAtom->getSection())->fAllLazyDylibPointers ) {
+ switch (ref->getTarget().getDefinitionKind()) {
+ case ObjectFile::Atom::kExternalDefinition:
+ case ObjectFile::Atom::kExternalWeakDefinition:
+ // prebound lazy pointer to another dylib ==> pointer contains zero
+ LittleEndian::set32(*fixUp, 0);
+ break;
+ case ObjectFile::Atom::kTentativeDefinition:
+ case ObjectFile::Atom::kRegularDefinition:
+ case ObjectFile::Atom::kWeakDefinition:
+ case ObjectFile::Atom::kAbsoluteSymbol:
+ // prebound lazy pointer to withing this dylib ==> pointer contains address
+ if ( ref->getTarget().isThumb() && (ref->getTargetOffset() == 0) )
+ targetAddr |= 1;
+ LittleEndian::set32(*fixUp, targetAddr);
+ break;
+ }
+ }
+ else if ( relocateableExternal ) {
+ if ( fOptions.prebind() ) {
+ switch (ref->getTarget().getDefinitionKind()) {
+ case ObjectFile::Atom::kExternalDefinition:
+ case ObjectFile::Atom::kExternalWeakDefinition:
+ // prebound external relocation ==> pointer contains addend
+ LittleEndian::set32(*fixUp, ref->getTargetOffset());
+ break;
+ case ObjectFile::Atom::kTentativeDefinition:
+ case ObjectFile::Atom::kRegularDefinition:
+ case ObjectFile::Atom::kWeakDefinition:
+ // prebound external relocation to internal atom ==> pointer contains target address + addend
+ if ( ref->getTarget().isThumb() && (ref->getTargetOffset() == 0) )
+ targetAddr |= 1;
+ LittleEndian::set32(*fixUp, targetAddr);
+ break;
+ case ObjectFile::Atom::kAbsoluteSymbol:
+ break;
+ }
+ }
+ else {
+ // external relocation ==> pointer contains addend
+ LittleEndian::set32(*fixUp, ref->getTargetOffset());
+ }
+ }
+ else {
+ // pointer contains target address
+ if ( ref->getTarget().isThumb() && (ref->getTargetOffset() == 0))
+ targetAddr |= 1;
+ LittleEndian::set32(*fixUp, targetAddr);
+ }
+ break;
+ case arm::kPointerDiff:
+ LittleEndian::set32(*fixUp,
+ (ref->getTarget().getAddress() + ref->getTargetOffset()) - (ref->getFromTarget().getAddress() + ref->getFromTargetOffset()) );
+ break;
+ case arm::kReadOnlyPointer:
+ switch ( ref->getTarget().getDefinitionKind() ) {
+ case ObjectFile::Atom::kRegularDefinition:
+ case ObjectFile::Atom::kWeakDefinition:
+ case ObjectFile::Atom::kTentativeDefinition:
+ // pointer contains target address
+ LittleEndian::set32(*fixUp, ref->getTarget().getAddress() + ref->getTargetOffset());
+ break;
+ case ObjectFile::Atom::kExternalDefinition:
+ case ObjectFile::Atom::kExternalWeakDefinition:
+ // external relocation ==> pointer contains addend
+ LittleEndian::set32(*fixUp, ref->getTargetOffset());
+ break;
+ case ObjectFile::Atom::kAbsoluteSymbol:
+ // pointer contains target address
+ LittleEndian::set32(*fixUp, ref->getTarget().getSectionOffset() + ref->getTargetOffset());
+ break;
+ }
+ break;
+ case arm::kBranch24WeakImport:
+ case arm::kBranch24:
+ displacement = targetAddr - (inAtom->getAddress() + ref->getFixUpOffset());
+ // The pc added will be +8 from the pc
+ displacement -= 8;
+ // fprintf(stderr, "bl/blx fixup to %s at 0x%08llX, displacement = 0x%08llX\n", ref->getTarget().getDisplayName(), ref->getTarget().getAddress(), displacement);
+ // max positive displacement is 0x007FFFFF << 2
+ // max negative displacement is 0xFF800000 << 2
+ if ( (displacement > 33554428LL) || (displacement < (-33554432LL)) ) {
+ throwf("b/bl/blx out of range (%lld max is +/-32M) from %s in %s to %s in %s",
+ displacement, inAtom->getDisplayName(), inAtom->getFile()->getPath(),
+ ref->getTarget().getDisplayName(), ref->getTarget().getFile()->getPath());
+ }
+ instruction = LittleEndian::get32(*fixUp);
+ // Make sure we are calling arm with bl, thumb with blx
+ is_bl = ((instruction & 0xFF000000) == 0xEB000000);
+ is_blx = ((instruction & 0xFE000000) == 0xFA000000);
+ if ( is_bl && ref->getTarget().isThumb() ) {
+ uint32_t opcode = 0xFA000000;
+ uint32_t disp = (uint32_t)(displacement >> 2) & 0x00FFFFFF;
+ uint32_t h_bit = (uint32_t)(displacement << 23) & 0x01000000;
+ newInstruction = opcode | h_bit | disp;
+ }
+ else if ( is_blx && !ref->getTarget().isThumb() ) {
+ uint32_t opcode = 0xEB000000;
+ uint32_t disp = (uint32_t)(displacement >> 2) & 0x00FFFFFF;
+ newInstruction = opcode | disp;
+ }
+ else if ( !is_bl && !is_blx && ref->getTarget().isThumb() ) {
+ throwf("don't know how to convert instruction %x referencing %s to thumb",
+ instruction, ref->getTarget().getDisplayName());
+ }
+ else {
+ newInstruction = (instruction & 0xFF000000) | ((uint32_t)(displacement >> 2) & 0x00FFFFFF);
+ }
+ LittleEndian::set32(*fixUp, newInstruction);
+ break;
+ case arm::kThumbBranch22WeakImport:
+ case arm::kThumbBranch22:
+ instruction = LittleEndian::get32(*fixUp);
+ is_bl = ((instruction & 0xF8000000) == 0xF8000000);
+ is_blx = ((instruction & 0xF8000000) == 0xE8000000);
+ targetIsThumb = ref->getTarget().isThumb();
+
+ // The pc added will be +4 from the pc
+ baseAddr = inAtom->getAddress() + ref->getFixUpOffset() + 4;
+ // If the target is not thumb, we will be generating a blx instruction
+ // Since blx cannot have the low bit set, set bit[1] of the target to
+ // bit[1] of the base address, so that the difference is a multiple of
+ // 4 bytes.
+ if ( !targetIsThumb ) {
+ targetAddr &= -3ULL;
+ targetAddr |= (baseAddr & 2LL);
+ }
+ displacement = targetAddr - baseAddr;
+
+ // max positive displacement is 0x003FFFFE
+ // max negative displacement is 0xFFC00000
+ if ( (displacement > 4194302LL) || (displacement < (-4194304LL)) ) {
+ throwf("thumb bl/blx out of range (%lld max is +/-4M) from %s in %s to %s in %s",
+ displacement, inAtom->getDisplayName(), inAtom->getFile()->getPath(),
+ ref->getTarget().getDisplayName(), ref->getTarget().getFile()->getPath());
+ }
+ // The instruction is really two instructions:
+ // The lower 16 bits are the first instruction, which contains the first
+ // 11 bits of the displacement.
+ // The upper 16 bits are the second instruction, which contains the next
+ // 11 bits of the displacement, as well as differentiating bl and blx.
+ {
+ firstDisp = (uint32_t)(displacement >> 12) & 0x7FF;
+ nextDisp = (uint32_t)(displacement >> 1) & 0x7FF;
+ if ( is_bl && !targetIsThumb ) {
+ opcode = 0xE800F000;
+ }
+ else if ( is_blx && targetIsThumb ) {
+ opcode = 0xF800F000;
+ }
+ else if ( !is_bl && !is_blx && !targetIsThumb ) {
+ throwf("don't know how to convert instruction %x referencing %s to arm",
+ instruction, ref->getTarget().getDisplayName());
+ }
+ else {
+ opcode = instruction & 0xF800F800;
+ }
+ newInstruction = opcode | (nextDisp << 16) | firstDisp;
+ LittleEndian::set32(*fixUp, newInstruction);
+ }
+ break;
+ case arm::kDtraceProbeSite:
+ case arm::kDtraceIsEnabledSite:
+ if ( inAtom->isThumb() ) {
+ // change 32-bit blx call site to two thumb NOPs
+ LittleEndian::set32(*fixUp, 0x46C046C0);
+ }
+ else {
+ // change call site to a NOP
+ LittleEndian::set32(*fixUp, 0xE1A00000);
+ }
+ break;
+ case arm::kDtraceTypeReference:
+ case arm::kDtraceProbe:
+ // nothing to fix up
+ break;
+ default:
+ throw "boom shaka laka";
+ }
+}
+
+template <>
+void Writer<arm>::fixUpReferenceRelocatable(const ObjectFile::Reference* ref, const ObjectFile::Atom* inAtom, uint8_t buffer[]) const
+{
+ int64_t displacement;
+ uint32_t instruction;
+ uint32_t newInstruction;
+ uint64_t targetAddr = 0;
+ int64_t baseAddr;
+ uint32_t firstDisp;
+ uint32_t nextDisp;
+ uint32_t opcode;
+ bool relocateableExternal = false;
+ bool is_bl;
+ bool is_blx;
+ bool targetIsThumb;
+
+ if ( ref->getTargetBinding() != ObjectFile::Reference::kDontBind ) {
+ targetAddr = ref->getTarget().getAddress() + ref->getTargetOffset();
+ relocateableExternal = this->makesExternalRelocatableReference(ref->getTarget());
+ }
+
+ uint32_t* fixUp = (uint32_t*)&buffer[ref->getFixUpOffset()];
+ switch ( (arm::ReferenceKinds)(ref->getKind()) ) {
+ case arm::kNoFixUp:
+ case arm::kFollowOn:
+ case arm::kGroupSubordinate:
+ // do nothing
+ break;
+ case arm::kPointer:
+ case arm::kReadOnlyPointer:
+ case arm::kPointerWeakImport:
+ {
+ if ( ((SectionInfo*)inAtom->getSection())->fAllNonLazyPointers ) {
+ // indirect symbol table has INDIRECT_SYMBOL_LOCAL, so we must put address in content
+ if ( this->indirectSymbolIsLocal(ref) )
+ LittleEndian::set32(*fixUp, targetAddr);
+ else
+ LittleEndian::set32(*fixUp, 0);
+ }
+ else if ( relocateableExternal ) {
+ if ( fOptions.prebind() ) {
+ switch (ref->getTarget().getDefinitionKind()) {
+ case ObjectFile::Atom::kExternalDefinition:
+ case ObjectFile::Atom::kExternalWeakDefinition:
+ // prebound external relocation ==> pointer contains addend
+ LittleEndian::set32(*fixUp, ref->getTargetOffset());
+ break;
+ case ObjectFile::Atom::kTentativeDefinition:
+ case ObjectFile::Atom::kRegularDefinition:
+ case ObjectFile::Atom::kWeakDefinition:
+ // prebound external relocation to internal atom ==> pointer contains target address + addend
+ LittleEndian::set32(*fixUp, targetAddr);
+ break;
+ case ObjectFile::Atom::kAbsoluteSymbol:
+ break;
+ }
+ }
+ }
+ else {
+ // internal relocation
+ if ( ref->getTarget().getDefinitionKind() != ObjectFile::Atom::kTentativeDefinition ) {
+ // pointer contains target address
+ if ( ref->getTarget().isThumb() && (ref->getTargetOffset() == 0))
+ targetAddr |= 1;
+ LittleEndian::set32(*fixUp, targetAddr);
+ }
+ else {
+ // pointer contains addend
+ LittleEndian::set32(*fixUp, ref->getTargetOffset());
+ }
+ }
+ }
+ break;
+ case arm::kPointerDiff:
+ LittleEndian::set32(*fixUp,
+ (ref->getTarget().getAddress() + ref->getTargetOffset()) - (ref->getFromTarget().getAddress() + ref->getFromTargetOffset()) );
+ break;
+ case arm::kDtraceProbeSite:
+ case arm::kDtraceIsEnabledSite:
+ case arm::kBranch24WeakImport:
+ case arm::kBranch24:
+ displacement = targetAddr - (inAtom->getAddress() + ref->getFixUpOffset());
+ // The pc added will be +8 from the pc
+ displacement -= 8;
+ // fprintf(stderr, "b/bl/blx fixup to %s at 0x%08llX, displacement = 0x%08llX\n", ref->getTarget().getDisplayName(), ref->getTarget().getAddress(), displacement);
+ if ( relocateableExternal ) {
+ // doing "ld -r" to an external symbol
+ // the mach-o way of encoding this is that the bl instruction's target addr is the offset into the target
+ displacement -= ref->getTarget().getAddress();
}
else {
- // if malloc fails, fall back to random uuid
- ::uuid_generate_random(digest);
+ // max positive displacement is 0x007FFFFF << 2
+ // max negative displacement is 0xFF800000 << 2
+ if ( (displacement > 33554428LL) || (displacement < (-33554432LL)) ) {
+ throwf("arm b/bl/blx out of range (%lld max is +/-32M) from %s in %s to %s in %s",
+ displacement, inAtom->getDisplayName(), inAtom->getFile()->getPath(),
+ ref->getTarget().getDisplayName(), ref->getTarget().getFile()->getPath());
+ }
}
- fUUIDAtom->setContent(digest);
- uint32_t uuidOffset = ((SectionInfo*)fUUIDAtom->getSection())->fFileOffset + fUUIDAtom->getSectionOffset();
- fUUIDAtom->copyRawContent(atomBuffer);
- ::pwrite(fFileDescriptor, atomBuffer, fUUIDAtom->getSize(), uuidOffset);
- }
- else {
- // if output file fit in memory, just genrate an md5 hash in memory
- CC_MD5(wholeBuffer, size, digest);
- fUUIDAtom->setContent(digest);
- uint32_t uuidOffset = ((SectionInfo*)fUUIDAtom->getSection())->fFileOffset + fUUIDAtom->getSectionOffset();
- fUUIDAtom->copyRawContent(&wholeBuffer[uuidOffset]);
- }
- }
-
- // finish up
- if ( streaming ) {
- delete [] atomBuffer;
- }
- else {
- // write whole output file in one chunk
- ::pwrite(fFileDescriptor, wholeBuffer, size, 0);
- delete [] wholeBuffer;
+ instruction = LittleEndian::get32(*fixUp);
+ // Make sure we are calling arm with bl, thumb with blx
+ is_bl = ((instruction & 0xFF000000) == 0xEB000000);
+ is_blx = ((instruction & 0xFE000000) == 0xFA000000);
+ if ( is_bl && ref->getTarget().isThumb() ) {
+ uint32_t opcode = 0xFA000000;
+ uint32_t disp = (uint32_t)(displacement >> 2) & 0x00FFFFFF;
+ uint32_t h_bit = (uint32_t)(displacement << 23) & 0x01000000;
+ newInstruction = opcode | h_bit | disp;
+ }
+ else if ( is_blx && !ref->getTarget().isThumb() ) {
+ uint32_t opcode = 0xEB000000;
+ uint32_t disp = (uint32_t)(displacement >> 2) & 0x00FFFFFF;
+ newInstruction = opcode | disp;
+ }
+ else if ( !is_bl && !is_blx && ref->getTarget().isThumb() ) {
+ throwf("don't know how to convert instruction %x referencing %s to thumb",
+ instruction, ref->getTarget().getDisplayName());
+ }
+ else {
+ newInstruction = (instruction & 0xFF000000) | ((uint32_t)(displacement >> 2) & 0x00FFFFFF);
+ }
+ LittleEndian::set32(*fixUp, newInstruction);
+ break;
+ case arm::kThumbBranch22WeakImport:
+ case arm::kThumbBranch22:
+ instruction = LittleEndian::get32(*fixUp);
+ is_bl = ((instruction & 0xF8000000) == 0xF8000000);
+ is_blx = ((instruction & 0xF8000000) == 0xE8000000);
+ targetIsThumb = ref->getTarget().isThumb();
+
+ // The pc added will be +4 from the pc
+ baseAddr = inAtom->getAddress() + ref->getFixUpOffset() + 4;
+ // If the target is not thumb, we will be generating a blx instruction
+ // Since blx cannot have the low bit set, set bit[1] of the target to
+ // bit[1] of the base address, so that the difference is a multiple of
+ // 4 bytes.
+ if (!targetIsThumb) {
+ targetAddr &= -3ULL;
+ targetAddr |= (baseAddr & 2LL);
+ }
+ displacement = targetAddr - baseAddr;
+
+ //fprintf(stderr, "thumb %s fixup to %s at 0x%08llX, baseAddr = 0x%08llX, displacement = 0x%08llX, %d\n", is_blx ? "blx" : "bl", ref->getTarget().getDisplayName(), targetAddr, baseAddr, displacement, targetIsThumb);
+ if ( relocateableExternal ) {
+ // doing "ld -r" to an external symbol
+ // the mach-o way of encoding this is that the bl instruction's target addr is the offset into the target
+ displacement -= ref->getTarget().getAddress();
+ }
+ else {
+ // max positive displacement is 0x003FFFFE
+ // max negative displacement is 0xFFC00000
+ if ( (displacement > 4194302LL) || (displacement < (-4194304LL)) ) {
+ throwf("thumb bl/blx out of range (%lld max is +/-4M) from %s in %s to %s in %s",
+ displacement, inAtom->getDisplayName(), inAtom->getFile()->getPath(),
+ ref->getTarget().getDisplayName(), ref->getTarget().getFile()->getPath());
+ }
+ }
+ // The instruction is really two instructions:
+ // The lower 16 bits are the first instruction, which contains the first
+ // 11 bits of the displacement.
+ // The upper 16 bits are the second instruction, which contains the next
+ // 11 bits of the displacement, as well as differentiating bl and blx.
+ firstDisp = (uint32_t)(displacement >> 12) & 0x7FF;
+ nextDisp = (uint32_t)(displacement >> 1) & 0x7FF;
+ if ( is_bl && !targetIsThumb ) {
+ opcode = 0xE800F000;
+ }
+ else if ( is_blx && targetIsThumb ) {
+ opcode = 0xF800F000;
+ }
+ else if ( !is_bl && !is_blx && !targetIsThumb ) {
+ throwf("don't know how to convert instruction %x referencing %s to arm",
+ instruction, ref->getTarget().getDisplayName());
+ }
+ else {
+ opcode = instruction & 0xF800F800;
+ }
+ newInstruction = opcode | (nextDisp << 16) | firstDisp;
+ LittleEndian::set32(*fixUp, newInstruction);
+ break;
+ case arm::kDtraceProbe:
+ case arm::kDtraceTypeReference:
+ // nothing to fix up
+ break;
}
-
- close(fFileDescriptor);
- return end;
}
-
template <>
void Writer<x86>::fixUpReferenceFinal(const ObjectFile::Reference* ref, const ObjectFile::Atom* inAtom, uint8_t buffer[]) const
{
uint8_t* dtraceProbeSite;
const int64_t kTwoGigLimit = 0x7FFFFFFF;
const int64_t kSixtyFourKiloLimit = 0x7FFF;
+ const int64_t kOneTwentyEightLimit = 0x7F;
int64_t displacement;
x86::ReferenceKinds kind = (x86::ReferenceKinds)(ref->getKind());
switch ( kind ) {
case x86::kNoFixUp:
case x86::kFollowOn:
+ case x86::kGroupSubordinate:
// do nothing
break;
case x86::kPointerWeakImport:
}
}
else {
- // external realocation ==> pointer contains addend
+ // external relocation ==> pointer contains addend
LittleEndian::set32(*fixUp, ref->getTargetOffset());
}
}
case x86::kPCRel32WeakImport:
case x86::kPCRel32:
case x86::kPCRel16:
+ case x86::kPCRel8:
displacement = 0;
switch ( ref->getTarget().getDefinitionKind() ) {
case ObjectFile::Atom::kRegularDefinition:
displacement = (ref->getTarget().getSectionOffset() + ref->getTargetOffset()) - (inAtom->getAddress() + ref->getFixUpOffset() + 4);
break;
}
- if ( kind == x86::kPCRel16 ) {
+ if ( kind == x86::kPCRel8 ) {
+ if ( (displacement > kOneTwentyEightLimit) || (displacement < -(kOneTwentyEightLimit)) ) {
+ //fprintf(stderr, "call out of range from %s in %s to %s in %s\n", this->getDisplayName(), this->getFile()->getPath(), target.getDisplayName(), target.getFile()->getPath());
+ throwf("rel8 out of range in %s", inAtom->getDisplayName());
+ }
+ *(int8_t*)fixUp = (int8_t)displacement;
+ }
+ else if ( kind == x86::kPCRel16 ) {
if ( (displacement > kSixtyFourKiloLimit) || (displacement < -(kSixtyFourKiloLimit)) ) {
//fprintf(stderr, "call out of range from %s in %s to %s in %s\n", this->getDisplayName(), this->getFile()->getPath(), target.getDisplayName(), target.getFile()->getPath());
throwf("rel16 out of range in %s", inAtom->getDisplayName());
break;
case ObjectFile::Atom::kExternalDefinition:
case ObjectFile::Atom::kExternalWeakDefinition:
- // external realocation ==> pointer contains addend
+ // external relocation ==> pointer contains addend
LittleEndian::set32(*fixUp, ref->getTargetOffset());
break;
case ObjectFile::Atom::kAbsoluteSymbol:
{
const int64_t kTwoGigLimit = 0x7FFFFFFF;
const int64_t kSixtyFourKiloLimit = 0x7FFF;
+ const int64_t kOneTwentyEightLimit = 0x7F;
uint32_t* fixUp = (uint32_t*)&buffer[ref->getFixUpOffset()];
bool isExtern = this->makesExternalRelocatableReference(ref->getTarget());
int64_t displacement;
switch ( kind ) {
case x86::kNoFixUp:
case x86::kFollowOn:
+ case x86::kGroupSubordinate:
// do nothing
break;
case x86::kPointer:
case x86::kAbsolute32:
{
if ( isExtern ) {
- // external realocation ==> pointer contains addend
+ // external relocation ==> pointer contains addend
LittleEndian::set32(*fixUp, ref->getTargetOffset());
}
else if ( ((SectionInfo*)inAtom->getSection())->fAllNonLazyPointers ) {
throwf("16-bit pointer diff out of range in %s", inAtom->getDisplayName());
LittleEndian::set16(*((uint16_t*)fixUp), (uint16_t)displacement);
break;
+ case x86::kPCRel8:
case x86::kPCRel16:
case x86::kPCRel32:
case x86::kPCRel32WeakImport:
displacement = ref->getTargetOffset() - (inAtom->getAddress() + ref->getFixUpOffset() + 4);
else
displacement = (ref->getTarget().getAddress() + ref->getTargetOffset()) - (inAtom->getAddress() + ref->getFixUpOffset() + 4);
- if ( kind == x86::kPCRel16 ) {
+ if ( kind == x86::kPCRel8 ) {
+ displacement += 3;
+ if ( (displacement > kOneTwentyEightLimit) || (displacement < -(kOneTwentyEightLimit)) ) {
+ //fprintf(stderr, "call out of range from %s in %s to %s in %s\n", this->getDisplayName(), this->getFile()->getPath(), target.getDisplayName(), target.getFile()->getPath());
+ throwf("rel8 out of range (%lld)in %s", displacement, inAtom->getDisplayName());
+ }
+ int8_t byte = (int8_t)displacement;
+ *((int8_t*)fixUp) = byte;
+ }
+ else if ( kind == x86::kPCRel16 ) {
displacement += 2;
if ( (displacement > kSixtyFourKiloLimit) || (displacement < -(kSixtyFourKiloLimit)) ) {
//fprintf(stderr, "call out of range from %s in %s to %s in %s\n", this->getDisplayName(), this->getFile()->getPath(), target.getDisplayName(), target.getFile()->getPath());
}
else {
if ( (displacement > kTwoGigLimit) || (displacement < (-kTwoGigLimit)) ) {
- //fprintf(stderr, "call out of range from %s in %s to %s in %s\n", this->getDisplayName(), this->getFile()->getPath(), target.getDisplayName(), target.getFile()->getPath());
+ //fprintf(stderr, "call out of range, displacement=ox%llX, from %s in %s to %s in %s\n", displacement,
+ // inAtom->getDisplayName(), inAtom->getFile()->getPath(), ref->getTarget().getDisplayName(), ref->getTarget().getFile()->getPath());
throwf("rel32 out of range in %s", inAtom->getDisplayName());
}
LittleEndian::set32(*fixUp, (int32_t)displacement);
switch ( (x86_64::ReferenceKinds)(ref->getKind()) ) {
case x86_64::kNoFixUp:
case x86_64::kFollowOn:
+ case x86_64::kGroupSubordinate:
// do nothing
break;
case x86_64::kPointerWeakImport:
{
//fprintf(stderr, "fixUpReferenceFinal: %s reference to %s\n", this->getDisplayName(), target.getDisplayName());
if ( this->relocationNeededInFinalLinkedImage(ref->getTarget()) == kRelocExternal ) {
- // external realocation ==> pointer contains addend
+ // external relocation ==> pointer contains addend
LittleEndian::set64(*fixUp, ref->getTargetOffset());
}
else {
// fall into general rel32 case
case x86_64::kBranchPCRel32WeakImport:
case x86_64::kBranchPCRel32:
+ case x86_64::kBranchPCRel8:
case x86_64::kPCRel32:
case x86_64::kPCRel32_1:
case x86_64::kPCRel32_2:
case x86_64::kPCRel32_4:
displacement -= 4;
break;
+ case x86_64::kBranchPCRel8:
+ displacement += 3;
+ break;
}
- if ( (displacement > twoGigLimit) || (displacement < (-twoGigLimit)) ) {
- fprintf(stderr, "call out of range from %s (%llX) in %s to %s (%llX) in %s\n",
- inAtom->getDisplayName(), inAtom->getAddress(), inAtom->getFile()->getPath(), ref->getTarget().getDisplayName(), ref->getTarget().getAddress(), ref->getTarget().getFile()->getPath());
- throw "rel32 out of range";
+ if ( ref->getKind() == x86_64::kBranchPCRel8 ) {
+ if ( (displacement > 127) || (displacement < (-128)) ) {
+ fprintf(stderr, "branch out of range from %s (%llX) in %s to %s (%llX) in %s\n",
+ inAtom->getDisplayName(), inAtom->getAddress(), inAtom->getFile()->getPath(), ref->getTarget().getDisplayName(), ref->getTarget().getAddress(), ref->getTarget().getFile()->getPath());
+ throw "rel8 out of range";
+ }
+ *((int8_t*)fixUp) = (int8_t)displacement;
+ }
+ else {
+ if ( (displacement > twoGigLimit) || (displacement < (-twoGigLimit)) ) {
+ fprintf(stderr, "call out of range from %s (%llX) in %s to %s (%llX) in %s\n",
+ inAtom->getDisplayName(), inAtom->getAddress(), inAtom->getFile()->getPath(), ref->getTarget().getDisplayName(), ref->getTarget().getAddress(), ref->getTarget().getFile()->getPath());
+ throw "rel32 out of range";
+ }
+ LittleEndian::set32(*((uint32_t*)fixUp), (int32_t)displacement);
}
- LittleEndian::set32(*((uint32_t*)fixUp), (int32_t)displacement);
break;
case x86_64::kDtraceProbeSite:
// change call site to a NOP
switch ( (x86_64::ReferenceKinds)(ref->getKind()) ) {
case x86_64::kNoFixUp:
case x86_64::kFollowOn:
+ case x86_64::kGroupSubordinate:
// do nothing
break;
case x86_64::kPointer:
case x86_64::kPointerWeakImport:
{
if ( external ) {
- // external realocation ==> pointer contains addend
+ // external relocation ==> pointer contains addend
LittleEndian::set64(*fixUp, ref->getTargetOffset());
}
else {
}
LittleEndian::set32(*((uint32_t*)fixUp), (int32_t)displacement);
break;
+ case x86_64::kBranchPCRel8:
+ // turn unsigned 64-bit target offset in signed 32-bit offset, since that is what source originally had
+ temp32 = ref->getTargetOffset();
+ if ( external ) {
+ // extern relocation contains addend
+ displacement = temp32;
+ }
+ else {
+ // internal relocations contain delta to target address
+ displacement = (ref->getTarget().getAddress() + temp32) - (inAtom->getAddress() + ref->getFixUpOffset() + 1);
+ }
+ if ( (displacement > 127) || (displacement < (-128)) ) {
+ //fprintf(stderr, "call out of range from %s in %s to %s in %s\n", this->getDisplayName(), this->getFile()->getPath(), target.getDisplayName(), target.getFile()->getPath());
+ throw "rel8 out of range";
+ }
+ *((int8_t*)fixUp) = (int8_t)displacement;
+ break;
case x86_64::kPCRel32GOT:
case x86_64::kPCRel32GOTLoad:
case x86_64::kPCRel32GOTWeakImport:
switch ( (typename A::ReferenceKinds)(ref->getKind()) ) {
case A::kNoFixUp:
case A::kFollowOn:
+ case A::kGroupSubordinate:
// do nothing
break;
case A::kPointerWeakImport:
case A::kPointer:
{
//fprintf(stderr, "fixUpReferenceFinal: %s reference to %s\n", this->getDisplayName(), target.getDisplayName());
- if ( finalLinkedImage && ((SectionInfo*)inAtom->getSection())->fAllLazyPointers ) {
- if ( fOptions.prebind() ) {
- switch (ref->getTarget().getDefinitionKind()) {
- case ObjectFile::Atom::kExternalDefinition:
- case ObjectFile::Atom::kExternalWeakDefinition:
- // prebound lazy pointer to another dylib ==> pointer contains zero
- P::setP(*fixUpPointer, 0);
- break;
- case ObjectFile::Atom::kTentativeDefinition:
- case ObjectFile::Atom::kRegularDefinition:
- case ObjectFile::Atom::kWeakDefinition:
- // prebound lazy pointer to withing this dylib ==> pointer contains address
- P::setP(*fixUpPointer, targetAddr);
- break;
- case ObjectFile::Atom::kAbsoluteSymbol:
- break;
- }
- }
- else {
- // lazy-symbol ==> pointer contains address of dyld_stub_binding_helper (stored in "from" target)
- if ( fDyldHelper == NULL )
- throw "symbol dyld_stub_binding_helper not defined (usually in crt1.o/dylib1.o/bundle1.o)";
- P::setP(*fixUpPointer, fDyldHelper->getAddress());
+ if ( finalLinkedImage && (((SectionInfo*)inAtom->getSection())->fAllLazyPointers
+ || ((SectionInfo*)inAtom->getSection())->fAllLazyDylibPointers) ) {
+ switch (ref->getTarget().getDefinitionKind()) {
+ case ObjectFile::Atom::kExternalDefinition:
+ case ObjectFile::Atom::kExternalWeakDefinition:
+ // prebound lazy pointer to another dylib ==> pointer contains zero
+ P::setP(*fixUpPointer, 0);
+ break;
+ case ObjectFile::Atom::kTentativeDefinition:
+ case ObjectFile::Atom::kRegularDefinition:
+ case ObjectFile::Atom::kWeakDefinition:
+ case ObjectFile::Atom::kAbsoluteSymbol:
+ // prebound lazy pointer to withing this dylib ==> pointer contains address
+ P::setP(*fixUpPointer, targetAddr);
+ break;
}
}
else if ( !finalLinkedImage && ((SectionInfo*)inAtom->getSection())->fAllNonLazyPointers ) {
}
}
else {
- // external realocation ==> pointer contains addend
+ // external relocation ==> pointer contains addend
P::setP(*fixUpPointer, ref->getTargetOffset());
}
}
break;
case A::kBranch14:
{
- //fprintf(stderr, "bc fixup %p to %s+0x%08X == 0x%08llX\n", this, ref->getTarget().getDisplayName(), ref->getTargetOffset(), targetAddr);
int64_t displacement = targetAddr - (inAtom->getAddress() + ref->getFixUpOffset());
if ( relocateableExternal ) {
// doing "ld -r" to an external symbol
// the mach-o way of encoding this is that the bl instruction's target addr is the offset into the target
displacement -= ref->getTarget().getAddress();
}
- else {
- const int64_t b_sixtyFourKiloLimit = 0x0000FFFF;
- if ( (displacement > b_sixtyFourKiloLimit) || (displacement < (-b_sixtyFourKiloLimit)) ) {
- //fprintf(stderr, "bl out of range (%lld max is +/-16M) from %s in %s to %s in %s\n", displacement, this->getDisplayName(), this->getFile()->getPath(), target.getDisplayName(), target.getFile()->getPath());
- throwf("bc out of range (%lld max is +/-64K) from %s in %s to %s in %s",
- displacement, inAtom->getDisplayName(), inAtom->getFile()->getPath(),
- ref->getTarget().getDisplayName(), ref->getTarget().getFile()->getPath());
- }
+ const int64_t b_sixtyFourKiloLimit = 0x0000FFFF;
+ if ( (displacement > b_sixtyFourKiloLimit) || (displacement < (-b_sixtyFourKiloLimit)) ) {
+ //fprintf(stderr, "bl out of range (%lld max is +/-16M) from %s in %s to %s in %s\n", displacement, this->getDisplayName(), this->getFile()->getPath(), target.getDisplayName(), target.getFile()->getPath());
+ throwf("bcc out of range (%lld max is +/-64K) from %s in %s to %s in %s",
+ displacement, inAtom->getDisplayName(), inAtom->getFile()->getPath(),
+ ref->getTarget().getDisplayName(), ref->getTarget().getFile()->getPath());
}
- //fprintf(stderr, "bc fixup displacement=0x%08llX, atom.addr=0x%08llX, atom.offset=0x%08X\n", displacement, inAtom->getAddress(), (uint32_t)ref->getFixUpOffset());
+
+ //fprintf(stderr, "bcc fixup displacement=0x%08llX, atom.addr=0x%08llX, atom.offset=0x%08X\n", displacement, inAtom->getAddress(), (uint32_t)ref->getFixUpOffset());
instruction = BigEndian::get32(*fixUp);
newInstruction = (instruction & 0xFFFF0003) | ((uint32_t)displacement & 0x0000FFFC);
//fprintf(stderr, "bc fixup: 0x%08X -> 0x%08X\n", instruction, newInstruction);
}
template <>
-bool Writer<ppc>::stubableReference(const ObjectFile::Reference* ref)
+bool Writer<ppc>::stubableReference(const ObjectFile::Atom* inAtom, const ObjectFile::Reference* ref)
{
uint8_t kind = ref->getKind();
switch ( (ppc::ReferenceKinds)kind ) {
case ppc::kNoFixUp:
case ppc::kFollowOn:
+ case ppc::kGroupSubordinate:
case ppc::kPointer:
case ppc::kPointerWeakImport:
case ppc::kPointerDiff16:
switch ( ref->getTarget().getDefinitionKind() ) {
case ObjectFile::Atom::kExternalDefinition:
case ObjectFile::Atom::kExternalWeakDefinition:
- return true;
+ // if the .o file this atom came from has long-branch stubs,
+ // then assume these instructions in a stub.
+ // Otherwise, these are a direct reference to something (maybe a runtime text reloc)
+ return ( inAtom->getFile()->hasLongBranchStubs() );
case ObjectFile::Atom::kTentativeDefinition:
case ObjectFile::Atom::kRegularDefinition:
case ObjectFile::Atom::kWeakDefinition:
return false;
}
+template <>
+bool Writer<arm>::stubableReference(const ObjectFile::Atom* inAtom, const ObjectFile::Reference* ref)
+{
+ uint8_t kind = ref->getKind();
+ switch ( (arm::ReferenceKinds)kind ) {
+ case arm::kBranch24:
+ case arm::kBranch24WeakImport:
+ case arm::kThumbBranch22:
+ case arm::kThumbBranch22WeakImport:
+ return true;
+ case arm::kNoFixUp:
+ case arm::kFollowOn:
+ case arm::kGroupSubordinate:
+ case arm::kPointer:
+ case arm::kReadOnlyPointer:
+ case arm::kPointerWeakImport:
+ case arm::kPointerDiff:
+ case arm::kDtraceProbe:
+ case arm::kDtraceProbeSite:
+ case arm::kDtraceIsEnabledSite:
+ case arm::kDtraceTypeReference:
+ return false;
+ }
+ return false;
+}
template <>
-bool Writer<ppc64>::stubableReference(const ObjectFile::Reference* ref)
+bool Writer<ppc64>::stubableReference(const ObjectFile::Atom* inAtom, const ObjectFile::Reference* ref)
{
uint8_t kind = ref->getKind();
switch ( (ppc64::ReferenceKinds)kind ) {
case ppc::kNoFixUp:
case ppc::kFollowOn:
+ case ppc::kGroupSubordinate:
case ppc::kPointer:
case ppc::kPointerWeakImport:
case ppc::kPointerDiff16:
}
template <>
-bool Writer<x86>::stubableReference(const ObjectFile::Reference* ref)
+bool Writer<x86>::stubableReference(const ObjectFile::Atom* inAtom, const ObjectFile::Reference* ref)
{
uint8_t kind = ref->getKind();
return (kind == x86::kPCRel32 || kind == x86::kPCRel32WeakImport);
}
template <>
-bool Writer<x86_64>::stubableReference(const ObjectFile::Reference* ref)
+bool Writer<x86_64>::stubableReference(const ObjectFile::Atom* inAtom, const ObjectFile::Reference* ref)
{
uint8_t kind = ref->getKind();
return (kind == x86_64::kBranchPCRel32 || kind == x86_64::kBranchPCRel32WeakImport);
return false;
}
-
+template <>
+bool Writer<arm>::weakImportReferenceKind(uint8_t kind)
+{
+ return (kind == arm::kBranch24WeakImport || kind == arm::kThumbBranch22WeakImport ||
+ kind == arm::kPointerWeakImport);
+}
template <>
bool Writer<ppc>::GOTReferenceKind(uint8_t kind)
return false;
}
+template <>
+bool Writer<arm>::GOTReferenceKind(uint8_t kind)
+{
+ return false;
+}
+
template <>
bool Writer<ppc>::optimizableGOTReferenceKind(uint8_t kind)
{
return false;
}
-
+template <>
+bool Writer<arm>::optimizableGOTReferenceKind(uint8_t kind)
+{
+ return false;
+}
// 64-bit architectures never need module table, 32-bit sometimes do for backwards compatiblity
template <typename A> bool Writer<A>::needsModuleTable() {return fOptions.needsModuleTable(); }
}
}
// renumber ordinals (depends on iterator walking in ordinal order)
+ // all LC_LAZY_LOAD_DYLIB load commands must have highest ordinals
uint32_t newOrdinal = 0;
for (std::map<uint32_t, ObjectFile::Reader*>::iterator it = ordinalToReader.begin(); it != ordinalToReader.end(); ++it) {
- if ( it->first <= fLibraryToOrdinal.size() )
- fLibraryToOrdinal[it->second] = ++newOrdinal;
+ if ( it->first <= fLibraryToOrdinal.size() ) {
+ if ( ! it->second->isLazyLoadedDylib() )
+ fLibraryToOrdinal[it->second] = ++newOrdinal;
+ }
+ }
+ for (std::map<uint32_t, ObjectFile::Reader*>::iterator it = ordinalToReader.begin(); it != ordinalToReader.end(); ++it) {
+ if ( it->first <= fLibraryToOrdinal.size() ) {
+ if ( it->second->isLazyLoadedDylib() ) {
+ fLibraryToOrdinal[it->second] = ++newOrdinal;
+ }
+ }
}
+
+ // <rdar://problem/5504954> linker does not error when dylib ordinal exceeds 250
+ if ( (newOrdinal >= MAX_LIBRARY_ORDINAL) && (fOptions.nameSpace() == Options::kTwoLevelNameSpace) )
+ throwf("two level namespace mach-o files can link with at most %d dylibs, this link would use %d dylibs", MAX_LIBRARY_ORDINAL, newOrdinal);
// add aliases (e.g. -lm points to libSystem.dylib)
for (std::map<ObjectFile::Reader*, ObjectFile::Reader*>::iterator it = readerAliases.begin(); it != readerAliases.end(); ++it) {
fLibraryToOrdinal[it->first] = fLibraryToOrdinal[it->second];
}
- // fprintf(stderr, "new ordinals table:\n");
+ //fprintf(stderr, "new ordinals table:\n");
//for (std::map<class ObjectFile::Reader*, uint32_t>::iterator it = fLibraryToOrdinal.begin(); it != fLibraryToOrdinal.end(); ++it) {
// fprintf(stderr, "%u <== %p/%s\n", it->second, it->first, it->first->getPath());
//}
}
+template <>
+void Writer<arm>::scanForAbsoluteReferences()
+{
+ // arm codegen never has absolute references. FIXME: Is this correct?
+}
+
template <>
void Writer<x86_64>::scanForAbsoluteReferences()
{
template <>
void Writer<x86>::scanForAbsoluteReferences()
{
- // when linking -pie verify there are no absolute addressing
- if ( fOptions.positionIndependentExecutable() ) {
+ // when linking -pie verify there are no absolute addressing, unless -read_only_relocs is also used
+ if ( fOptions.positionIndependentExecutable() && !fOptions.allowTextRelocs() ) {
for (std::vector<ObjectFile::Atom*>::iterator it=fAllAtoms->begin(); it != fAllAtoms->end(); it++) {
ObjectFile::Atom* atom = *it;
std::vector<ObjectFile::Reference*>& references = atom->getReferences();
ObjectFile::Reference* ref = *rit;
switch (ref->getKind()) {
case x86::kAbsolute32:
- throwf("cannot link -pie: -mdynamic-no-pic codegen found in %s from %s\n", atom->getDisplayName(), atom->getFile()->getPath());
+ throwf("cannot link -pie: -mdynamic-no-pic codegen found in %s from %s", atom->getDisplayName(), atom->getFile()->getPath());
return;
}
}
template <>
void Writer<ppc>::scanForAbsoluteReferences()
{
- // when linking -pie verify there are no absolute addressing
- if ( fOptions.positionIndependentExecutable() ) {
+ // when linking -pie verify there are no absolute addressing, unless -read_only_relocs is also used
+ if ( fOptions.positionIndependentExecutable() && !fOptions.allowTextRelocs() ) {
for (std::vector<ObjectFile::Atom*>::iterator it=fAllAtoms->begin(); it != fAllAtoms->end(); it++) {
ObjectFile::Atom* atom = *it;
std::vector<ObjectFile::Reference*>& references = atom->getReferences();
case ppc::kAbsLow14:
case ppc::kAbsHigh16:
case ppc::kAbsHigh16AddLow:
- throwf("cannot link -pie: -mdynamic-no-pic codegen found in %s from %s\n", atom->getDisplayName(), atom->getFile()->getPath());
+ throwf("cannot link -pie: -mdynamic-no-pic codegen found in %s from %s", atom->getDisplayName(), atom->getFile()->getPath());
return;
}
}
case 25:// stub would occupy 0x7D->0x82
case 38:// stub would occupy 0xBE->0xC3
case 51:// stub would occupy 0xFF->0x04
- betterStubs.push_back(new StubAtom<x86>(*this, *((ObjectFile::Atom*)NULL))); //pad with dummy stub
+ betterStubs.push_back(new StubAtom<x86>(*this, *((ObjectFile::Atom*)NULL), false)); //pad with dummy stub
break;
}
betterStubs.push_back(*it);
if ( (target.getDefinitionKind() == ObjectFile::Atom::kExternalDefinition)
|| (target.getDefinitionKind() == ObjectFile::Atom::kExternalWeakDefinition) ) {
bool weakImport = this->weakImportReferenceKind(ref->getKind());
+ // <rdar://problem/5633081> Obj-C Symbols in Leopard Can't Be Weak Linked
+ // dyld in Mac OS X 10.3 and earlier need N_WEAK_REF bit set on undefines to objc symbols
+ // in dylibs that are weakly linked.
+ if ( (ref->getKind() == A::kNoFixUp) && (strncmp(target.getName(), ".objc_class_name_", 17) == 0) ) {
+ typename std::map<class ObjectFile::Reader*, class DylibLoadCommandsAtom<A>* >::iterator pos;
+ pos = fLibraryToLoadCommand.find(target.getFile());
+ if ( pos != fLibraryToLoadCommand.end() ) {
+ if ( pos->second->linkedWeak() )
+ weakImport = true;
+ }
+ }
std::map<const ObjectFile::Atom*,bool>::iterator pos = fWeakImportMap.find(&target);
if ( pos == fWeakImportMap.end() ) {
// target not in fWeakImportMap, so add
}
}
}
+ // update if we use a weak_import or a strong import from this dylib
+ if ( fWeakImportMap[&target] )
+ fDylibReadersWithWeakImports.insert(target.getFile());
+ else
+ fDylibReadersWithNonWeakImports.insert(target.getFile());
}
// create stubs as needed
- if ( this->stubableReference(ref)
+ if ( this->stubableReference(atom, ref)
&& (ref->getTargetOffset() == 0)
&& this->relocationNeededInFinalLinkedImage(target) == kRelocExternal ) {
ObjectFile::Atom* stub = NULL;
std::map<const ObjectFile::Atom*,ObjectFile::Atom*>::iterator pos = fStubsMap.find(&target);
if ( pos == fStubsMap.end() ) {
- stub = new StubAtom<A>(*this, target);
+ bool forLazyDylib = false;
+ switch ( target.getDefinitionKind() ) {
+ case ObjectFile::Atom::kRegularDefinition:
+ case ObjectFile::Atom::kWeakDefinition:
+ case ObjectFile::Atom::kAbsoluteSymbol:
+ case ObjectFile::Atom::kTentativeDefinition:
+ break;
+ case ObjectFile::Atom::kExternalDefinition:
+ case ObjectFile::Atom::kExternalWeakDefinition:
+ if ( target.getFile()->isLazyLoadedDylib() )
+ forLazyDylib = true;
+ break;
+ }
+ stub = new StubAtom<A>(*this, target, forLazyDylib);
fStubsMap[&target] = stub;
}
else {
// alter reference to use stub instead
ref->setTarget(*stub, 0);
}
+ else if ( fOptions.usingLazyDylibLinking() && target.getFile()->isLazyLoadedDylib() ) {
+ throwf("illegal reference to %s in lazy loaded dylib from %s in %s",
+ target.getDisplayName(), atom->getDisplayName(),
+ atom->getFile()->getPath());
+ }
// create GOT slots (non-lazy pointers) as needed
else if ( this->GOTReferenceKind(ref->getKind()) ) {
//
// sort stubs
std::sort(fAllSynthesizedStubs.begin(), fAllSynthesizedStubs.end(), AtomByNameSorter());
- // add dummy stubs (x86 only)
- this->insertDummyStubs();
+ // add dummy fast stubs (x86 only)
+ if ( !fOptions.slowx86Stubs() )
+ this->insertDummyStubs();
// sort lazy pointers
std::sort(fAllSynthesizedLazyPointers.begin(), fAllSynthesizedLazyPointers.end(), AtomByNameSorter());
+ std::sort(fAllSynthesizedLazyDylibPointers.begin(), fAllSynthesizedLazyDylibPointers.end(), AtomByNameSorter());
+
// add stubs to fAllAtoms
if ( fAllSynthesizedStubs.size() != 0 ) {
- std::vector<ObjectFile::Atom*>* stubs = (std::vector<ObjectFile::Atom*>*)&fAllSynthesizedStubs;
- std::vector<ObjectFile::Atom*> mergedStubs;
- if ( fAllSynthesizedStubHelpers.size() != 0 ) {
- // when we have stubs and helpers, insert both into fAllAtoms
- mergedStubs.insert(mergedStubs.end(), fAllSynthesizedStubs.begin(), fAllSynthesizedStubs.end());
- mergedStubs.insert(mergedStubs.end(), fAllSynthesizedStubHelpers.begin(), fAllSynthesizedStubHelpers.end());
- stubs = &mergedStubs;
+ std::vector<ObjectFile::Atom*> textStubs;
+ std::vector<ObjectFile::Atom*> importStubs;
+ for (typename std::vector<class StubAtom<A>*>::iterator sit=fAllSynthesizedStubs.begin(); sit != fAllSynthesizedStubs.end(); ++sit) {
+ ObjectFile::Atom* stubAtom = *sit;
+ if ( strcmp(stubAtom->getSegment().getName(), "__TEXT") == 0 )
+ textStubs.push_back(stubAtom);
+ else
+ importStubs.push_back(stubAtom);
}
+ // any helper stubs go right after regular stubs
+ if ( fAllSynthesizedStubHelpers.size() != 0 )
+ textStubs.insert(textStubs.end(), fAllSynthesizedStubHelpers.begin(), fAllSynthesizedStubHelpers.end());
+ // insert text stubs right after __text section
ObjectFile::Section* curSection = NULL;
ObjectFile::Atom* prevAtom = NULL;
for (std::vector<ObjectFile::Atom*>::iterator it=fAllAtoms->begin(); it != fAllAtoms->end(); it++) {
ObjectFile::Atom* atom = *it;
ObjectFile::Section* nextSection = atom->getSection();
if ( nextSection != curSection ) {
- // HACK HACK for i386 where stubs are not in _TEXT segment
- if ( strcmp(fAllSynthesizedStubs[0]->getSegment().getName(), "__IMPORT") == 0 ) {
+ if ( (prevAtom != NULL) && (strcmp(prevAtom->getSectionName(), "__text") == 0) ) {
+ // found end of __text section, insert stubs here
+ fAllAtoms->insert(it, textStubs.begin(), textStubs.end());
+ break;
+ }
+ curSection = nextSection;
+ }
+ prevAtom = atom;
+ }
+ if ( importStubs.size() != 0 ) {
+ // insert __IMPORTS stubs right before __LINKEDIT
+ for (std::vector<ObjectFile::Atom*>::iterator it=fAllAtoms->begin(); it != fAllAtoms->end(); it++) {
+ ObjectFile::Atom* atom = *it;
+ ObjectFile::Section* nextSection = atom->getSection();
+ if ( nextSection != curSection ) {
+ // for i386 where stubs are not in __TEXT segment
if ( ((prevAtom != NULL) && (strcmp(prevAtom->getSegment().getName(), "__IMPORT") == 0))
|| (strcmp(atom->getSegment().getName(), "__LINKEDIT") == 0) ) {
// insert stubs at end of __IMPORT segment, or before __LINKEDIT
- fAllAtoms->insert(it, fAllSynthesizedStubs.begin(), fAllSynthesizedStubs.end());
+ fAllAtoms->insert(it, importStubs.begin(), importStubs.end());
break;
}
+ curSection = nextSection;
}
- else {
- if ( (prevAtom != NULL) && (strcmp(prevAtom->getSectionName(), "__text") == 0) ) {
- // found end of __text section, insert stubs here
- fAllAtoms->insert(it, stubs->begin(), stubs->end());
- break;
- }
+ prevAtom = atom;
+ }
+ }
+ }
+
+
+ // add lazy dylib pointers to fAllAtoms
+ if ( fAllSynthesizedLazyDylibPointers.size() != 0 ) {
+ ObjectFile::Section* curSection = NULL;
+ ObjectFile::Atom* prevAtom = NULL;
+ bool inserted = false;
+ for (std::vector<ObjectFile::Atom*>::iterator it=fAllAtoms->begin(); it != fAllAtoms->end(); it++) {
+ ObjectFile::Atom* atom = *it;
+ ObjectFile::Section* nextSection = atom->getSection();
+ if ( nextSection != curSection ) {
+ if ( (prevAtom != NULL) && (strcmp(prevAtom->getSectionName(), "__dyld") == 0) ) {
+ // found end of __dyld section, insert lazy pointers here
+ fAllAtoms->insert(it, fAllSynthesizedLazyDylibPointers.begin(), fAllSynthesizedLazyDylibPointers.end());
+ inserted = true;
+ break;
}
curSection = nextSection;
}
prevAtom = atom;
}
+ if ( !inserted ) {
+ throw "can't insert lazy pointers, __dyld section not found";
+ }
}
-
// add lazy pointers to fAllAtoms
if ( fAllSynthesizedLazyPointers.size() != 0 ) {
ObjectFile::Section* curSection = NULL;
currentSegmentInfo->fInitProtection = initprot;
if ( initprot == 0 )
currentSegmentInfo->fMaxProtection = 0; // pagezero should have maxprot==initprot==0
+ else if ( fOptions.architecture() == CPU_TYPE_ARM )
+ currentSegmentInfo->fMaxProtection = currentSegmentInfo->fInitProtection; // iPhoneOS wants max==init
else
currentSegmentInfo->fMaxProtection = VM_PROT_READ | VM_PROT_WRITE | VM_PROT_EXECUTE;
std::vector<Options::SegmentProtect>& customSegProtections = fOptions.customSegmentProtections();
currentSectionInfo->fAllLazyPointers = true;
if ( (strcmp(currentSectionInfo->fSegmentName, "__DATA") == 0) && (strcmp(currentSectionInfo->fSectionName, "__la_sym_ptr2") == 0) )
currentSectionInfo->fAllLazyPointers = true;
+ if ( (strcmp(currentSectionInfo->fSegmentName, "__DATA") == 0) && (strcmp(currentSectionInfo->fSectionName, "__ld_symbol_ptr") == 0) )
+ currentSectionInfo->fAllLazyDylibPointers = true;
if ( (strcmp(currentSectionInfo->fSegmentName, "__DATA") == 0) && (strcmp(currentSectionInfo->fSectionName, "__nl_symbol_ptr") == 0) )
currentSectionInfo->fAllNonLazyPointers = true;
if ( (strcmp(currentSectionInfo->fSegmentName, "__IMPORT") == 0) && (strcmp(currentSectionInfo->fSectionName, "__pointers") == 0) )
currentSectionInfo->fAllStubs = true;
if ( (strcmp(currentSectionInfo->fSegmentName, "__TEXT") == 0) && (strcmp(currentSectionInfo->fSectionName, "__symbol_stub") == 0) )
currentSectionInfo->fAllStubs = true;
+ if ( (strcmp(currentSectionInfo->fSegmentName, "__TEXT") == 0) && (strcmp(currentSectionInfo->fSectionName, "__picsymbolstub4") == 0) )
+ currentSectionInfo->fAllStubs = true;
+ if ( (strcmp(currentSectionInfo->fSegmentName, "__TEXT") == 0) && (strcmp(currentSectionInfo->fSectionName, "__symbol_stub4") == 0) )
+ currentSectionInfo->fAllStubs = true;
if ( (strcmp(currentSectionInfo->fSegmentName, "__IMPORT") == 0) && (strcmp(currentSectionInfo->fSectionName, "__jump_table") == 0) ) {
currentSectionInfo->fAllSelfModifyingStubs = true;
currentSectionInfo->fAlignment = 6; // force x86 fast stubs to start on 64-byte boundary
}
+ if ( (strcmp(currentSectionInfo->fSegmentName, "__TEXT") == 0) && (strcmp(currentSectionInfo->fSectionName, "__eh_frame") == 0) )
+ currentSectionInfo->fAlignment = __builtin_ctz(sizeof(pint_t)); // always start CFI info pointer aligned
curSection = atom->getSection();
- if ( currentSectionInfo->fAllNonLazyPointers || currentSectionInfo->fAllLazyPointers
- || currentSectionInfo->fAllStubs || currentSectionInfo->fAllStubs ) {
+ if ( currentSectionInfo->fAllNonLazyPointers || currentSectionInfo->fAllLazyPointers || currentSectionInfo->fAllLazyDylibPointers
+ || currentSectionInfo->fAllStubs || currentSectionInfo->fAllSelfModifyingStubs ) {
fSymbolTableCommands->needDynamicTable();
}
}
return false;
}
+template <>
+bool Writer<arm>::addBranchIslands()
+{
+ // arm branch islands not (yet) supported
+ // you can instead compile with -mlong-call
+ return false;
+}
template <>
bool Writer<ppc>::isBranch24Reference(uint8_t kind)
AtomToIsland regionsMap[kIslandRegionsCount];
std::vector<ObjectFile::Atom*> regionsIslands[kIslandRegionsCount];
unsigned int islandCount = 0;
+ if ( log) fprintf(stderr, "ld: will use %u branch island regions\n", kIslandRegionsCount);
// create islands for branch references that are out of range
for (std::vector<ObjectFile::Atom*>::iterator it=fAllAtoms->begin(); it != fAllAtoms->end(); it++) {
uint64_t nextTargetOffset = ref->getTargetOffset();
for (int i=kIslandRegionsCount-1; i >=0 ; --i) {
AtomToIsland* region = ®ionsMap[i];
- int64_t islandRegionAddr = kBetweenRegions * (i+1);
- if ( (srcAddr < islandRegionAddr) && (islandRegionAddr <= dstAddr) ) {
+ int64_t islandRegionAddr = kBetweenRegions * (i+1) + textSection->getBaseAddress();
+ if ( (srcAddr < islandRegionAddr) && (islandRegionAddr <= dstAddr) ) {
AtomToIsland::iterator pos = region->find(finalTargetAndOffset);
if ( pos == region->end() ) {
BranchIslandAtom<A>* island = new BranchIslandAtom<A>(*this, target.getDisplayName(), i, *nextTarget, nextTargetOffset);
}
}
}
- if (log) fprintf(stderr, "using island %s for %s\n", nextTarget->getDisplayName(), atom->getDisplayName());
+ if (log) fprintf(stderr, "using island %s for branch to %s from %s\n", nextTarget->getDisplayName(), target.getDisplayName(), atom->getDisplayName());
ref->setTarget(*nextTarget, nextTargetOffset);
}
else if ( displacement < (-kFifteenMegLimit) ) {
if ( log ) fprintf(stderr, "ld: %u branch islands required in %u regions\n", islandCount, kIslandRegionsCount);
std::vector<ObjectFile::Atom*> newAtomList;
newAtomList.reserve(textSection->fAtoms.size()+islandCount);
- uint64_t islandRegionAddr = kBetweenRegions;
+ uint64_t islandRegionAddr = kBetweenRegions + textSection->getBaseAddress();
uint64_t textSectionAlignment = (1 << textSection->fAlignment);
int regionIndex = 0;
uint64_t atomSlide = 0;
uint64_t sectionOffset = 0;
for (std::vector<ObjectFile::Atom*>::iterator it=textSection->fAtoms.begin(); it != textSection->fAtoms.end(); it++) {
ObjectFile::Atom* atom = *it;
- newAtomList.push_back(atom);
if ( atom->getAddress() > islandRegionAddr ) {
- uint64_t islandStartOffset = atom->getSectionOffset();
- sectionOffset = islandStartOffset + atomSlide;
+ uint64_t islandStartOffset = atom->getSectionOffset() + atomSlide;
+ sectionOffset = islandStartOffset;
std::vector<ObjectFile::Atom*>* regionIslands = ®ionsIslands[regionIndex];
for (std::vector<ObjectFile::Atom*>::iterator rit=regionIslands->begin(); rit != regionIslands->end(); rit++) {
ObjectFile::Atom* islandAtom = *rit;
uint64_t islandRegionAlignmentBlocks = (sectionOffset - islandStartOffset + textSectionAlignment - 1) / textSectionAlignment;
atomSlide += (islandRegionAlignmentBlocks * textSectionAlignment);
}
+ newAtomList.push_back(atom);
if ( atomSlide != 0 )
atom->setSectionOffset(atom->getSectionOffset()+atomSlide);
}
// mach-o .o files need no padding between load commands and first section
paddingSize = 0;
}
+ else if ( fOptions.makeEncryptable() ) {
+ // want load commands to end on a page boundary, so __text starts on page boundary
+ paddingSize = 4096 - ((totalSizeOfHeaderAndLoadCommands+fOptions.minimumHeaderPad()) % 4096) + fOptions.minimumHeaderPad();
+ fEncryptionLoadCommand->setStartEncryptionOffset(totalSizeOfHeaderAndLoadCommands+paddingSize);
+ }
else {
// work backwards from end of segment and lay out sections so that extra room goes to padding atom
uint64_t addr = 0;
// update section info
curSection->fFileOffset = fileOffset;
curSection->setBaseAddress(address);
+ //fprintf(stderr, "%s %s %llX\n", curSegment->fName, curSection->fSectionName, address);
// keep track of trailing zero fill sections
if ( curSection->fAllZeroFill && (firstZeroFillSection == NULL) )
}
}
+ // record size of encrypted part of __TEXT segment
+ if ( fOptions.makeEncryptable() ) {
+ for (std::vector<SegmentInfo*>::iterator segit = fSegmentInfos.begin(); segit != fSegmentInfos.end(); ++segit) {
+ SegmentInfo* curSegment = *segit;
+ if ( strcmp(curSegment->fName, "__TEXT") == 0 ) {
+ fEncryptionLoadCommand->setEndEncryptionOffset(curSegment->fFileSize);
+ break;
+ }
+ }
+ }
+
}
template <typename A>
{
header.set_magic(MH_MAGIC);
header.set_cputype(CPU_TYPE_POWERPC);
- switch ( fWriter.fCpuConstraint ) {
- case ObjectFile::Reader::kCpuAny:
- header.set_cpusubtype(CPU_SUBTYPE_POWERPC_ALL);
- break;
- case ObjectFile::Reader::kCpuG3:
- header.set_cpusubtype(CPU_SUBTYPE_POWERPC_750);
- break;
- case ObjectFile::Reader::kCpuG4:
- header.set_cpusubtype(CPU_SUBTYPE_POWERPC_7400);
- break;
- case ObjectFile::Reader::kCpuG5:
- header.set_cpusubtype(CPU_SUBTYPE_POWERPC_970);
- break;
- }
+ header.set_cpusubtype(fWriter.fCpuConstraint);
}
template <>
header.set_reserved(0);
}
+template <>
+void MachHeaderAtom<arm>::setHeaderInfo(macho_header<arm::P>& header) const
+{
+ header.set_magic(MH_MAGIC);
+ header.set_cputype(CPU_TYPE_ARM);
+ header.set_cpusubtype(fWriter.fCpuConstraint);
+}
template <typename A>
CustomStackAtom<A>::CustomStackAtom(Writer<A>& writer)
}
-template <>
-bool CustomStackAtom<ppc>::stackGrowsDown()
-{
- return true;
-}
-
-template <>
-bool CustomStackAtom<ppc64>::stackGrowsDown()
-{
- return true;
-}
-
-template <>
-bool CustomStackAtom<x86>::stackGrowsDown()
-{
- return true;
-}
-
-template <>
-bool CustomStackAtom<x86_64>::stackGrowsDown()
-{
- return true;
-}
-
+template <> bool CustomStackAtom<ppc>::stackGrowsDown() { return true; }
+template <> bool CustomStackAtom<ppc64>::stackGrowsDown() { return true; }
+template <> bool CustomStackAtom<x86>::stackGrowsDown() { return true; }
+template <> bool CustomStackAtom<x86_64>::stackGrowsDown() { return true; }
+template <> bool CustomStackAtom<arm>::stackGrowsDown() { return true; }
template <typename A>
void SegmentLoadCommandsAtom<A>::computeSize()
return ((size+7) & (-8)); // 8-byte align all load commands for 64-bit mach-o
}
+template <>
+uint64_t LoadCommandAtom<arm>::alignedSize(uint64_t size)
+{
+ return ((size+3) & (-4)); // 4-byte align all load commands for 32-bit mach-o
+}
+
template <typename A>
void SegmentLoadCommandsAtom<A>::copyRawContent(uint8_t buffer[]) const
{
sect->set_flags(S_LAZY_SYMBOL_POINTERS);
sect->set_reserved1(sectInfo->fIndirectSymbolOffset);
}
+ else if ( sectInfo->fAllLazyDylibPointers ) {
+ sect->set_flags(S_LAZY_DYLIB_SYMBOL_POINTERS);
+ sect->set_reserved1(sectInfo->fIndirectSymbolOffset);
+ }
else if ( sectInfo->fAllNonLazyPointers ) {
sect->set_flags(S_NON_LAZY_SYMBOL_POINTERS);
sect->set_reserved1(sectInfo->fIndirectSymbolOffset);
else if ( (strcmp(sectInfo->fSectionName, "__message_refs") == 0) && (strcmp(sectInfo->fSegmentName, "__OBJC") == 0) ) {
sect->set_flags(S_LITERAL_POINTERS);
}
+ else if ( (strcmp(sectInfo->fSectionName, "__cls_refs") == 0) && (strcmp(sectInfo->fSegmentName, "__OBJC") == 0) ) {
+ sect->set_flags(S_LITERAL_POINTERS);
+ }
else if ( (strncmp(sectInfo->fSectionName, "__dof_", 6) == 0) && (strcmp(sectInfo->fSegmentName, "__TEXT") == 0) ) {
sect->set_flags(S_DTRACE_DOF);
}
}
else if ( (strncmp(sectInfo->fSectionName, "__text", 6) == 0) && (strcmp(sectInfo->fSegmentName, "__TEXT") == 0) ) {
sect->set_flags(S_REGULAR | S_ATTR_SOME_INSTRUCTIONS | S_ATTR_PURE_INSTRUCTIONS);
+ if ( sectInfo->fHasTextLocalRelocs )
+ sect->set_flags(sect->flags() | S_ATTR_LOC_RELOC);
+ if ( sectInfo->fHasTextExternalRelocs )
+ sect->set_flags(sect->flags() | S_ATTR_EXT_RELOC);
}
}
}
bzero(buffer, size);
const char* path = fInfo.reader->getInstallPath();
macho_dylib_command<P>* cmd = (macho_dylib_command<P>*)buffer;
- if ( fInfo.options.fWeakImport )
+ // <rdar://problem/5529626> If only weak_import symbols are used, linker should use LD_LOAD_WEAK_DYLIB
+ bool autoWeakLoadDylib = ( (fWriter.fDylibReadersWithWeakImports.count(fInfo.reader) > 0)
+ && (fWriter.fDylibReadersWithNonWeakImports.count(fInfo.reader) == 0) );
+ if ( fInfo.options.fLazyLoad )
+ cmd->set_cmd(LC_LAZY_LOAD_DYLIB);
+ else if ( fInfo.options.fWeakImport || autoWeakLoadDylib )
cmd->set_cmd(LC_LOAD_WEAK_DYLIB);
else if ( fInfo.options.fReExport && (fWriter.fOptions.macosxVersionMin() >= ObjectFile::ReaderOptions::k10_5) )
cmd->set_cmd(LC_REEXPORT_DYLIB);
void RoutinesLoadCommandsAtom<A>::copyRawContent(uint8_t buffer[]) const
{
uint64_t initAddr = fWriter.getAtomLoadAddress(fWriter.fEntryPoint);
+ if (fWriter.fEntryPoint->isThumb())
+ initAddr |= 1ULL;
bzero(buffer, sizeof(macho_routines_command<P>));
macho_routines_command<P>* cmd = (macho_routines_command<P>*)buffer;
cmd->set_cmd(macho_routines_command<P>::CMD);
return this->alignedSize(16 + x86_THREAD_STATE64_COUNT * 4);
}
+// We should be picking it up from a header
+template <>
+uint64_t ThreadsLoadCommandsAtom<arm>::getSize() const
+{
+ return this->alignedSize(16 + 17 * 4); // base size + ARM_THREAD_STATE_COUNT * 4
+}
+
template <>
void ThreadsLoadCommandsAtom<ppc>::copyRawContent(uint8_t buffer[]) const
{
cmd->set_thread_register(7, fWriter.fOptions.customStackAddr()); // esp
}
-
template <>
void ThreadsLoadCommandsAtom<x86_64>::copyRawContent(uint8_t buffer[]) const
{
cmd->set_thread_register(7, fWriter.fOptions.customStackAddr()); // uesp
}
+template <>
+void ThreadsLoadCommandsAtom<arm>::copyRawContent(uint8_t buffer[]) const
+{
+ uint64_t size = this->getSize();
+ uint64_t start = fWriter.getAtomLoadAddress(fWriter.fEntryPoint);
+ bzero(buffer, size);
+ macho_thread_command<arm::P>* cmd = (macho_thread_command<arm::P>*)buffer;
+ cmd->set_cmd(LC_UNIXTHREAD);
+ cmd->set_cmdsize(size);
+ cmd->set_flavor(1);
+ cmd->set_count(17);
+ cmd->set_thread_register(15, start); // pc
+ if ( fWriter.fOptions.hasCustomStack() )
+ cmd->set_thread_register(13, fWriter.fOptions.customStackAddr()); // FIXME: sp?
+}
template <typename A>
uint64_t RPathLoadCommandsAtom<A>::getSize() const
}
+
+template <typename A>
+void EncryptionLoadCommandsAtom<A>::copyRawContent(uint8_t buffer[]) const
+{
+ uint64_t size = this->getSize();
+ bzero(buffer, size);
+ macho_encryption_info_command<P>* cmd = (macho_encryption_info_command<P>*)buffer;
+ cmd->set_cmd(LC_ENCRYPTION_INFO);
+ cmd->set_cmdsize(this->getSize());
+ cmd->set_cryptoff(fStartOffset);
+ cmd->set_cryptsize(fEndOffset-fStartOffset);
+ cmd->set_cryptid(0);
+}
+
+
+
template <typename A>
void LoadCommandsPaddingAtom<A>::copyRawContent(uint8_t buffer[]) const
{
// objc info section is in a different segment and section for 32 vs 64 bit runtimes
template <> const char* ObjCInfoAtom<ppc>::getSectionName() const { return "__image_info"; }
template <> const char* ObjCInfoAtom<x86>::getSectionName() const { return "__image_info"; }
+template <> const char* ObjCInfoAtom<arm>::getSectionName() const { return "__objc_imageinfo"; }
template <> const char* ObjCInfoAtom<ppc64>::getSectionName() const { return "__objc_imageinfo"; }
template <> const char* ObjCInfoAtom<x86_64>::getSectionName() const { return "__objc_imageinfo"; }
template <> Segment& ObjCInfoAtom<x86>::getInfoSegment() const { return Segment::fgObjCSegment; }
template <> Segment& ObjCInfoAtom<ppc64>::getInfoSegment() const { return Segment::fgDataSegment; }
template <> Segment& ObjCInfoAtom<x86_64>::getInfoSegment() const { return Segment::fgDataSegment; }
-
+template <> Segment& ObjCInfoAtom<arm>::getInfoSegment() const { return Segment::fgDataSegment; }
}; // namespace executable
projects / apple / ld64.git / blobdiff