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llvm-project/llvm/lib/Object/MachOObjectFile.cpp

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//===- MachOObjectFile.cpp - Mach-O object file binding -------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines the MachOObjectFile class, which binds the MachOObject
// class to the generic ObjectFile wrapper.
//
//===----------------------------------------------------------------------===//
#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/None.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/ADT/StringSwitch.h"
#include "llvm/ADT/Triple.h"
#include "llvm/ADT/Twine.h"
#include "llvm/Object/Error.h"
#include "llvm/Object/MachO.h"
#include "llvm/Object/ObjectFile.h"
#include "llvm/Object/SymbolicFile.h"
#include "llvm/Support/DataExtractor.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/Error.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/Format.h"
#include "llvm/Support/Host.h"
#include "llvm/Support/LEB128.h"
#include "llvm/Support/MachO.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Support/SwapByteOrder.h"
#include <algorithm>
#include <cassert>
#include <cstddef>
#include <cstdint>
#include <cstring>
#include <limits>
#include <list>
#include <memory>
#include <string>
#include <system_error>
using namespace llvm;
using namespace object;
namespace {
struct section_base {
char sectname[16];
char segname[16];
};
} // end anonymous namespace
static Error
malformedError(Twine Msg) {
std::string StringMsg = "truncated or malformed object (" + Msg.str() + ")";
return make_error<GenericBinaryError>(std::move(StringMsg),
object_error::parse_failed);
}
// FIXME: Replace all uses of this function with getStructOrErr.
template <typename T>
static T getStruct(const MachOObjectFile &O, const char *P) {
// Don't read before the beginning or past the end of the file
if (P < O.getData().begin() || P + sizeof(T) > O.getData().end())
report_fatal_error("Malformed MachO file.");
T Cmd;
memcpy(&Cmd, P, sizeof(T));
if (O.isLittleEndian() != sys::IsLittleEndianHost)
MachO::swapStruct(Cmd);
return Cmd;
}
template <typename T>
static Expected<T> getStructOrErr(const MachOObjectFile &O, const char *P) {
// Don't read before the beginning or past the end of the file
if (P < O.getData().begin() || P + sizeof(T) > O.getData().end())
return malformedError("Structure read out-of-range");
T Cmd;
memcpy(&Cmd, P, sizeof(T));
if (O.isLittleEndian() != sys::IsLittleEndianHost)
MachO::swapStruct(Cmd);
return Cmd;
}
static const char *
getSectionPtr(const MachOObjectFile &O, MachOObjectFile::LoadCommandInfo L,
unsigned Sec) {
uintptr_t CommandAddr = reinterpret_cast<uintptr_t>(L.Ptr);
bool Is64 = O.is64Bit();
unsigned SegmentLoadSize = Is64 ? sizeof(MachO::segment_command_64) :
sizeof(MachO::segment_command);
unsigned SectionSize = Is64 ? sizeof(MachO::section_64) :
sizeof(MachO::section);
uintptr_t SectionAddr = CommandAddr + SegmentLoadSize + Sec * SectionSize;
return reinterpret_cast<const char*>(SectionAddr);
}
static const char *getPtr(const MachOObjectFile &O, size_t Offset) {
return O.getData().substr(Offset, 1).data();
}
static MachO::nlist_base
getSymbolTableEntryBase(const MachOObjectFile &O, DataRefImpl DRI) {
const char *P = reinterpret_cast<const char *>(DRI.p);
return getStruct<MachO::nlist_base>(O, P);
}
static StringRef parseSegmentOrSectionName(const char *P) {
if (P[15] == 0)
// Null terminated.
return P;
// Not null terminated, so this is a 16 char string.
return StringRef(P, 16);
}
static unsigned getCPUType(const MachOObjectFile &O) {
return O.getHeader().cputype;
}
static uint32_t
getPlainRelocationAddress(const MachO::any_relocation_info &RE) {
return RE.r_word0;
}
static unsigned
getScatteredRelocationAddress(const MachO::any_relocation_info &RE) {
return RE.r_word0 & 0xffffff;
}
static bool getPlainRelocationPCRel(const MachOObjectFile &O,
const MachO::any_relocation_info &RE) {
if (O.isLittleEndian())
return (RE.r_word1 >> 24) & 1;
return (RE.r_word1 >> 7) & 1;
}
static bool
getScatteredRelocationPCRel(const MachO::any_relocation_info &RE) {
return (RE.r_word0 >> 30) & 1;
}
static unsigned getPlainRelocationLength(const MachOObjectFile &O,
const MachO::any_relocation_info &RE) {
if (O.isLittleEndian())
return (RE.r_word1 >> 25) & 3;
return (RE.r_word1 >> 5) & 3;
}
static unsigned
getScatteredRelocationLength(const MachO::any_relocation_info &RE) {
return (RE.r_word0 >> 28) & 3;
}
static unsigned getPlainRelocationType(const MachOObjectFile &O,
const MachO::any_relocation_info &RE) {
if (O.isLittleEndian())
return RE.r_word1 >> 28;
return RE.r_word1 & 0xf;
}
static uint32_t getSectionFlags(const MachOObjectFile &O,
DataRefImpl Sec) {
if (O.is64Bit()) {
MachO::section_64 Sect = O.getSection64(Sec);
return Sect.flags;
}
MachO::section Sect = O.getSection(Sec);
return Sect.flags;
}
static Expected<MachOObjectFile::LoadCommandInfo>
getLoadCommandInfo(const MachOObjectFile &Obj, const char *Ptr,
uint32_t LoadCommandIndex) {
if (auto CmdOrErr = getStructOrErr<MachO::load_command>(Obj, Ptr)) {
if (CmdOrErr->cmdsize < 8)
return malformedError("load command " + Twine(LoadCommandIndex) +
" with size less than 8 bytes");
return MachOObjectFile::LoadCommandInfo({Ptr, *CmdOrErr});
} else
return CmdOrErr.takeError();
}
static Expected<MachOObjectFile::LoadCommandInfo>
getFirstLoadCommandInfo(const MachOObjectFile &Obj) {
unsigned HeaderSize = Obj.is64Bit() ? sizeof(MachO::mach_header_64)
: sizeof(MachO::mach_header);
if (sizeof(MachO::load_command) > Obj.getHeader().sizeofcmds)
return malformedError("load command 0 extends past the end all load "
"commands in the file");
return getLoadCommandInfo(Obj, getPtr(Obj, HeaderSize), 0);
}
static Expected<MachOObjectFile::LoadCommandInfo>
getNextLoadCommandInfo(const MachOObjectFile &Obj, uint32_t LoadCommandIndex,
const MachOObjectFile::LoadCommandInfo &L) {
unsigned HeaderSize = Obj.is64Bit() ? sizeof(MachO::mach_header_64)
: sizeof(MachO::mach_header);
if (L.Ptr + L.C.cmdsize + sizeof(MachO::load_command) >
Obj.getData().data() + HeaderSize + Obj.getHeader().sizeofcmds)
return malformedError("load command " + Twine(LoadCommandIndex + 1) +
" extends past the end all load commands in the file");
return getLoadCommandInfo(Obj, L.Ptr + L.C.cmdsize, LoadCommandIndex + 1);
}
template <typename T>
static void parseHeader(const MachOObjectFile &Obj, T &Header,
Error &Err) {
if (sizeof(T) > Obj.getData().size()) {
Err = malformedError("the mach header extends past the end of the "
"file");
return;
}
if (auto HeaderOrErr = getStructOrErr<T>(Obj, getPtr(Obj, 0)))
Header = *HeaderOrErr;
else
Err = HeaderOrErr.takeError();
}
// This is used to check for overlapping of Mach-O elements.
struct MachOElement {
uint64_t Offset;
uint64_t Size;
const char *Name;
};
static Error checkOverlappingElement(std::list<MachOElement> &Elements,
uint64_t Offset, uint64_t Size,
const char *Name) {
if (Size == 0)
return Error::success();
for (auto it=Elements.begin() ; it != Elements.end(); ++it) {
auto E = *it;
if ((Offset >= E.Offset && Offset < E.Offset + E.Size) ||
(Offset + Size > E.Offset && Offset + Size < E.Offset + E.Size) ||
(Offset <= E.Offset && Offset + Size >= E.Offset + E.Size))
return malformedError(Twine(Name) + " at offset " + Twine(Offset) +
" with a size of " + Twine(Size) + ", overlaps " +
E.Name + " at offset " + Twine(E.Offset) + " with "
"a size of " + Twine(E.Size));
auto nt = it;
nt++;
if (nt != Elements.end()) {
auto N = *nt;
if (Offset + Size <= N.Offset) {
Elements.insert(nt, {Offset, Size, Name});
return Error::success();
}
}
}
Elements.push_back({Offset, Size, Name});
return Error::success();
}
// Parses LC_SEGMENT or LC_SEGMENT_64 load command, adds addresses of all
// sections to \param Sections, and optionally sets
// \param IsPageZeroSegment to true.
template <typename Segment, typename Section>
static Error parseSegmentLoadCommand(
const MachOObjectFile &Obj, const MachOObjectFile::LoadCommandInfo &Load,
SmallVectorImpl<const char *> &Sections, bool &IsPageZeroSegment,
uint32_t LoadCommandIndex, const char *CmdName, uint64_t SizeOfHeaders,
std::list<MachOElement> &Elements) {
const unsigned SegmentLoadSize = sizeof(Segment);
if (Load.C.cmdsize < SegmentLoadSize)
return malformedError("load command " + Twine(LoadCommandIndex) +
" " + CmdName + " cmdsize too small");
if (auto SegOrErr = getStructOrErr<Segment>(Obj, Load.Ptr)) {
Segment S = SegOrErr.get();
const unsigned SectionSize = sizeof(Section);
uint64_t FileSize = Obj.getData().size();
if (S.nsects > std::numeric_limits<uint32_t>::max() / SectionSize ||
S.nsects * SectionSize > Load.C.cmdsize - SegmentLoadSize)
return malformedError("load command " + Twine(LoadCommandIndex) +
" inconsistent cmdsize in " + CmdName +
" for the number of sections");
for (unsigned J = 0; J < S.nsects; ++J) {
const char *Sec = getSectionPtr(Obj, Load, J);
Sections.push_back(Sec);
Section s = getStruct<Section>(Obj, Sec);
if (Obj.getHeader().filetype != MachO::MH_DYLIB_STUB &&
Obj.getHeader().filetype != MachO::MH_DSYM &&
s.flags != MachO::S_ZEROFILL &&
s.flags != MachO::S_THREAD_LOCAL_ZEROFILL &&
s.offset > FileSize)
return malformedError("offset field of section " + Twine(J) + " in " +
CmdName + " command " + Twine(LoadCommandIndex) +
" extends past the end of the file");
if (Obj.getHeader().filetype != MachO::MH_DYLIB_STUB &&
Obj.getHeader().filetype != MachO::MH_DSYM &&
s.flags != MachO::S_ZEROFILL &&
s.flags != MachO::S_THREAD_LOCAL_ZEROFILL && S.fileoff == 0 &&
s.offset < SizeOfHeaders && s.size != 0)
return malformedError("offset field of section " + Twine(J) + " in " +
CmdName + " command " + Twine(LoadCommandIndex) +
" not past the headers of the file");
uint64_t BigSize = s.offset;
BigSize += s.size;
if (Obj.getHeader().filetype != MachO::MH_DYLIB_STUB &&
Obj.getHeader().filetype != MachO::MH_DSYM &&
s.flags != MachO::S_ZEROFILL &&
s.flags != MachO::S_THREAD_LOCAL_ZEROFILL &&
BigSize > FileSize)
return malformedError("offset field plus size field of section " +
Twine(J) + " in " + CmdName + " command " +
Twine(LoadCommandIndex) +
" extends past the end of the file");
if (Obj.getHeader().filetype != MachO::MH_DYLIB_STUB &&
Obj.getHeader().filetype != MachO::MH_DSYM &&
s.flags != MachO::S_ZEROFILL &&
s.flags != MachO::S_THREAD_LOCAL_ZEROFILL &&
s.size > S.filesize)
return malformedError("size field of section " +
Twine(J) + " in " + CmdName + " command " +
Twine(LoadCommandIndex) +
" greater than the segment");
if (Obj.getHeader().filetype != MachO::MH_DYLIB_STUB &&
Obj.getHeader().filetype != MachO::MH_DSYM && s.size != 0 &&
s.addr < S.vmaddr)
return malformedError("addr field of section " + Twine(J) + " in " +
CmdName + " command " + Twine(LoadCommandIndex) +
" less than the segment's vmaddr");
BigSize = s.addr;
BigSize += s.size;
uint64_t BigEnd = S.vmaddr;
BigEnd += S.vmsize;
if (S.vmsize != 0 && s.size != 0 && BigSize > BigEnd)
return malformedError("addr field plus size of section " + Twine(J) +
" in " + CmdName + " command " +
Twine(LoadCommandIndex) +
" greater than than "
"the segment's vmaddr plus vmsize");
if (Obj.getHeader().filetype != MachO::MH_DYLIB_STUB &&
Obj.getHeader().filetype != MachO::MH_DSYM &&
s.flags != MachO::S_ZEROFILL &&
s.flags != MachO::S_THREAD_LOCAL_ZEROFILL)
if (Error Err = checkOverlappingElement(Elements, s.offset, s.size,
"section contents"))
return Err;
if (s.reloff > FileSize)
return malformedError("reloff field of section " + Twine(J) + " in " +
CmdName + " command " + Twine(LoadCommandIndex) +
" extends past the end of the file");
BigSize = s.nreloc;
BigSize *= sizeof(struct MachO::relocation_info);
BigSize += s.reloff;
if (BigSize > FileSize)
return malformedError("reloff field plus nreloc field times sizeof("
"struct relocation_info) of section " +
Twine(J) + " in " + CmdName + " command " +
Twine(LoadCommandIndex) +
" extends past the end of the file");
if (Error Err = checkOverlappingElement(Elements, s.reloff, s.nreloc *
sizeof(struct
MachO::relocation_info),
"section relocation entries"))
return Err;
}
if (S.fileoff > FileSize)
return malformedError("load command " + Twine(LoadCommandIndex) +
" fileoff field in " + CmdName +
" extends past the end of the file");
uint64_t BigSize = S.fileoff;
BigSize += S.filesize;
if (BigSize > FileSize)
return malformedError("load command " + Twine(LoadCommandIndex) +
" fileoff field plus filesize field in " +
CmdName + " extends past the end of the file");
if (S.vmsize != 0 && S.filesize > S.vmsize)
return malformedError("load command " + Twine(LoadCommandIndex) +
" filesize field in " + CmdName +
" greater than vmsize field");
IsPageZeroSegment |= StringRef("__PAGEZERO").equals(S.segname);
} else
return SegOrErr.takeError();
return Error::success();
}
static Error checkSymtabCommand(const MachOObjectFile &Obj,
const MachOObjectFile::LoadCommandInfo &Load,
uint32_t LoadCommandIndex,
const char **SymtabLoadCmd,
std::list<MachOElement> &Elements) {
if (Load.C.cmdsize < sizeof(MachO::symtab_command))
return malformedError("load command " + Twine(LoadCommandIndex) +
" LC_SYMTAB cmdsize too small");
if (*SymtabLoadCmd != nullptr)
return malformedError("more than one LC_SYMTAB command");
MachO::symtab_command Symtab =
getStruct<MachO::symtab_command>(Obj, Load.Ptr);
if (Symtab.cmdsize != sizeof(MachO::symtab_command))
return malformedError("LC_SYMTAB command " + Twine(LoadCommandIndex) +
" has incorrect cmdsize");
uint64_t FileSize = Obj.getData().size();
if (Symtab.symoff > FileSize)
return malformedError("symoff field of LC_SYMTAB command " +
Twine(LoadCommandIndex) + " extends past the end "
"of the file");
uint64_t SymtabSize = Symtab.nsyms;
const char *struct_nlist_name;
if (Obj.is64Bit()) {
SymtabSize *= sizeof(MachO::nlist_64);
struct_nlist_name = "struct nlist_64";
} else {
SymtabSize *= sizeof(MachO::nlist);
struct_nlist_name = "struct nlist";
}
uint64_t BigSize = SymtabSize;
BigSize += Symtab.symoff;
if (BigSize > FileSize)
return malformedError("symoff field plus nsyms field times sizeof(" +
Twine(struct_nlist_name) + ") of LC_SYMTAB command " +
Twine(LoadCommandIndex) + " extends past the end "
"of the file");
if (Error Err = checkOverlappingElement(Elements, Symtab.symoff, SymtabSize,
"symbol table"))
return Err;
if (Symtab.stroff > FileSize)
return malformedError("stroff field of LC_SYMTAB command " +
Twine(LoadCommandIndex) + " extends past the end "
"of the file");
BigSize = Symtab.stroff;
BigSize += Symtab.strsize;
if (BigSize > FileSize)
return malformedError("stroff field plus strsize field of LC_SYMTAB "
"command " + Twine(LoadCommandIndex) + " extends "
"past the end of the file");
if (Error Err = checkOverlappingElement(Elements, Symtab.stroff,
Symtab.strsize, "string table"))
return Err;
*SymtabLoadCmd = Load.Ptr;
return Error::success();
}
static Error checkDysymtabCommand(const MachOObjectFile &Obj,
const MachOObjectFile::LoadCommandInfo &Load,
uint32_t LoadCommandIndex,
const char **DysymtabLoadCmd,
std::list<MachOElement> &Elements) {
if (Load.C.cmdsize < sizeof(MachO::dysymtab_command))
return malformedError("load command " + Twine(LoadCommandIndex) +
" LC_DYSYMTAB cmdsize too small");
if (*DysymtabLoadCmd != nullptr)
return malformedError("more than one LC_DYSYMTAB command");
MachO::dysymtab_command Dysymtab =
getStruct<MachO::dysymtab_command>(Obj, Load.Ptr);
if (Dysymtab.cmdsize != sizeof(MachO::dysymtab_command))
return malformedError("LC_DYSYMTAB command " + Twine(LoadCommandIndex) +
" has incorrect cmdsize");
uint64_t FileSize = Obj.getData().size();
if (Dysymtab.tocoff > FileSize)
return malformedError("tocoff field of LC_DYSYMTAB command " +
Twine(LoadCommandIndex) + " extends past the end of "
"the file");
uint64_t BigSize = Dysymtab.ntoc;
BigSize *= sizeof(MachO::dylib_table_of_contents);
BigSize += Dysymtab.tocoff;
if (BigSize > FileSize)
return malformedError("tocoff field plus ntoc field times sizeof(struct "
"dylib_table_of_contents) of LC_DYSYMTAB command " +
Twine(LoadCommandIndex) + " extends past the end of "
"the file");
if (Error Err = checkOverlappingElement(Elements, Dysymtab.tocoff,
Dysymtab.ntoc * sizeof(struct
MachO::dylib_table_of_contents),
"table of contents"))
return Err;
if (Dysymtab.modtaboff > FileSize)
return malformedError("modtaboff field of LC_DYSYMTAB command " +
Twine(LoadCommandIndex) + " extends past the end of "
"the file");
BigSize = Dysymtab.nmodtab;
const char *struct_dylib_module_name;
uint64_t sizeof_modtab;
if (Obj.is64Bit()) {
sizeof_modtab = sizeof(MachO::dylib_module_64);
struct_dylib_module_name = "struct dylib_module_64";
} else {
sizeof_modtab = sizeof(MachO::dylib_module);
struct_dylib_module_name = "struct dylib_module";
}
BigSize *= sizeof_modtab;
BigSize += Dysymtab.modtaboff;
if (BigSize > FileSize)
return malformedError("modtaboff field plus nmodtab field times sizeof(" +
Twine(struct_dylib_module_name) + ") of LC_DYSYMTAB "
"command " + Twine(LoadCommandIndex) + " extends "
"past the end of the file");
if (Error Err = checkOverlappingElement(Elements, Dysymtab.modtaboff,
Dysymtab.nmodtab * sizeof_modtab,
"module table"))
return Err;
if (Dysymtab.extrefsymoff > FileSize)
return malformedError("extrefsymoff field of LC_DYSYMTAB command " +
Twine(LoadCommandIndex) + " extends past the end of "
"the file");
BigSize = Dysymtab.nextrefsyms;
BigSize *= sizeof(MachO::dylib_reference);
BigSize += Dysymtab.extrefsymoff;
if (BigSize > FileSize)
return malformedError("extrefsymoff field plus nextrefsyms field times "
"sizeof(struct dylib_reference) of LC_DYSYMTAB "
"command " + Twine(LoadCommandIndex) + " extends "
"past the end of the file");
if (Error Err = checkOverlappingElement(Elements, Dysymtab.extrefsymoff,
Dysymtab.nextrefsyms *
sizeof(MachO::dylib_reference),
"reference table"))
return Err;
if (Dysymtab.indirectsymoff > FileSize)
return malformedError("indirectsymoff field of LC_DYSYMTAB command " +
Twine(LoadCommandIndex) + " extends past the end of "
"the file");
BigSize = Dysymtab.nindirectsyms;
BigSize *= sizeof(uint32_t);
BigSize += Dysymtab.indirectsymoff;
if (BigSize > FileSize)
return malformedError("indirectsymoff field plus nindirectsyms field times "
"sizeof(uint32_t) of LC_DYSYMTAB command " +
Twine(LoadCommandIndex) + " extends past the end of "
"the file");
if (Error Err = checkOverlappingElement(Elements, Dysymtab.indirectsymoff,
Dysymtab.nindirectsyms *
sizeof(uint32_t),
"indirect table"))
return Err;
if (Dysymtab.extreloff > FileSize)
return malformedError("extreloff field of LC_DYSYMTAB command " +
Twine(LoadCommandIndex) + " extends past the end of "
"the file");
BigSize = Dysymtab.nextrel;
BigSize *= sizeof(MachO::relocation_info);
BigSize += Dysymtab.extreloff;
if (BigSize > FileSize)
return malformedError("extreloff field plus nextrel field times sizeof"
"(struct relocation_info) of LC_DYSYMTAB command " +
Twine(LoadCommandIndex) + " extends past the end of "
"the file");
if (Error Err = checkOverlappingElement(Elements, Dysymtab.extreloff,
Dysymtab.nextrel *
sizeof(MachO::relocation_info),
"external relocation table"))
return Err;
if (Dysymtab.locreloff > FileSize)
return malformedError("locreloff field of LC_DYSYMTAB command " +
Twine(LoadCommandIndex) + " extends past the end of "
"the file");
BigSize = Dysymtab.nlocrel;
BigSize *= sizeof(MachO::relocation_info);
BigSize += Dysymtab.locreloff;
if (BigSize > FileSize)
return malformedError("locreloff field plus nlocrel field times sizeof"
"(struct relocation_info) of LC_DYSYMTAB command " +
Twine(LoadCommandIndex) + " extends past the end of "
"the file");
if (Error Err = checkOverlappingElement(Elements, Dysymtab.locreloff,
Dysymtab.nlocrel *
sizeof(MachO::relocation_info),
"local relocation table"))
return Err;
*DysymtabLoadCmd = Load.Ptr;
return Error::success();
}
static Error checkLinkeditDataCommand(const MachOObjectFile &Obj,
const MachOObjectFile::LoadCommandInfo &Load,
uint32_t LoadCommandIndex,
const char **LoadCmd, const char *CmdName,
std::list<MachOElement> &Elements,
const char *ElementName) {
if (Load.C.cmdsize < sizeof(MachO::linkedit_data_command))
return malformedError("load command " + Twine(LoadCommandIndex) + " " +
CmdName + " cmdsize too small");
if (*LoadCmd != nullptr)
return malformedError("more than one " + Twine(CmdName) + " command");
MachO::linkedit_data_command LinkData =
getStruct<MachO::linkedit_data_command>(Obj, Load.Ptr);
if (LinkData.cmdsize != sizeof(MachO::linkedit_data_command))
return malformedError(Twine(CmdName) + " command " +
Twine(LoadCommandIndex) + " has incorrect cmdsize");
uint64_t FileSize = Obj.getData().size();
if (LinkData.dataoff > FileSize)
return malformedError("dataoff field of " + Twine(CmdName) + " command " +
Twine(LoadCommandIndex) + " extends past the end of "
"the file");
uint64_t BigSize = LinkData.dataoff;
BigSize += LinkData.datasize;
if (BigSize > FileSize)
return malformedError("dataoff field plus datasize field of " +
Twine(CmdName) + " command " +
Twine(LoadCommandIndex) + " extends past the end of "
"the file");
if (Error Err = checkOverlappingElement(Elements, LinkData.dataoff,
LinkData.datasize, ElementName))
return Err;
*LoadCmd = Load.Ptr;
return Error::success();
}
static Error checkDyldInfoCommand(const MachOObjectFile &Obj,
const MachOObjectFile::LoadCommandInfo &Load,
uint32_t LoadCommandIndex,
const char **LoadCmd, const char *CmdName,
std::list<MachOElement> &Elements) {
if (Load.C.cmdsize < sizeof(MachO::dyld_info_command))
return malformedError("load command " + Twine(LoadCommandIndex) + " " +
CmdName + " cmdsize too small");
if (*LoadCmd != nullptr)
return malformedError("more than one LC_DYLD_INFO and or LC_DYLD_INFO_ONLY "
"command");
MachO::dyld_info_command DyldInfo =
getStruct<MachO::dyld_info_command>(Obj, Load.Ptr);
if (DyldInfo.cmdsize != sizeof(MachO::dyld_info_command))
return malformedError(Twine(CmdName) + " command " +
Twine(LoadCommandIndex) + " has incorrect cmdsize");
uint64_t FileSize = Obj.getData().size();
if (DyldInfo.rebase_off > FileSize)
return malformedError("rebase_off field of " + Twine(CmdName) +
" command " + Twine(LoadCommandIndex) + " extends "
"past the end of the file");
uint64_t BigSize = DyldInfo.rebase_off;
BigSize += DyldInfo.rebase_size;
if (BigSize > FileSize)
return malformedError("rebase_off field plus rebase_size field of " +
Twine(CmdName) + " command " +
Twine(LoadCommandIndex) + " extends past the end of "
"the file");
if (Error Err = checkOverlappingElement(Elements, DyldInfo.rebase_off,
DyldInfo.rebase_size,
"dyld rebase info"))
return Err;
if (DyldInfo.bind_off > FileSize)
return malformedError("bind_off field of " + Twine(CmdName) +
" command " + Twine(LoadCommandIndex) + " extends "
"past the end of the file");
BigSize = DyldInfo.bind_off;
BigSize += DyldInfo.bind_size;
if (BigSize > FileSize)
return malformedError("bind_off field plus bind_size field of " +
Twine(CmdName) + " command " +
Twine(LoadCommandIndex) + " extends past the end of "
"the file");
if (Error Err = checkOverlappingElement(Elements, DyldInfo.bind_off,
DyldInfo.bind_size,
"dyld bind info"))
return Err;
if (DyldInfo.weak_bind_off > FileSize)
return malformedError("weak_bind_off field of " + Twine(CmdName) +
" command " + Twine(LoadCommandIndex) + " extends "
"past the end of the file");
BigSize = DyldInfo.weak_bind_off;
BigSize += DyldInfo.weak_bind_size;
if (BigSize > FileSize)
return malformedError("weak_bind_off field plus weak_bind_size field of " +
Twine(CmdName) + " command " +
Twine(LoadCommandIndex) + " extends past the end of "
"the file");
if (Error Err = checkOverlappingElement(Elements, DyldInfo.weak_bind_off,
DyldInfo.weak_bind_size,
"dyld weak bind info"))
return Err;
if (DyldInfo.lazy_bind_off > FileSize)
return malformedError("lazy_bind_off field of " + Twine(CmdName) +
" command " + Twine(LoadCommandIndex) + " extends "
"past the end of the file");
BigSize = DyldInfo.lazy_bind_off;
BigSize += DyldInfo.lazy_bind_size;
if (BigSize > FileSize)
return malformedError("lazy_bind_off field plus lazy_bind_size field of " +
Twine(CmdName) + " command " +
Twine(LoadCommandIndex) + " extends past the end of "
"the file");
if (Error Err = checkOverlappingElement(Elements, DyldInfo.lazy_bind_off,
DyldInfo.lazy_bind_size,
"dyld lazy bind info"))
return Err;
if (DyldInfo.export_off > FileSize)
return malformedError("export_off field of " + Twine(CmdName) +
" command " + Twine(LoadCommandIndex) + " extends "
"past the end of the file");
BigSize = DyldInfo.export_off;
BigSize += DyldInfo.export_size;
if (BigSize > FileSize)
return malformedError("export_off field plus export_size field of " +
Twine(CmdName) + " command " +
Twine(LoadCommandIndex) + " extends past the end of "
"the file");
if (Error Err = checkOverlappingElement(Elements, DyldInfo.export_off,
DyldInfo.export_size,
"dyld export info"))
return Err;
*LoadCmd = Load.Ptr;
return Error::success();
}
static Error checkDylibCommand(const MachOObjectFile &Obj,
const MachOObjectFile::LoadCommandInfo &Load,
uint32_t LoadCommandIndex, const char *CmdName) {
if (Load.C.cmdsize < sizeof(MachO::dylib_command))
return malformedError("load command " + Twine(LoadCommandIndex) + " " +
CmdName + " cmdsize too small");
MachO::dylib_command D = getStruct<MachO::dylib_command>(Obj, Load.Ptr);
if (D.dylib.name < sizeof(MachO::dylib_command))
return malformedError("load command " + Twine(LoadCommandIndex) + " " +
CmdName + " name.offset field too small, not past "
"the end of the dylib_command struct");
if (D.dylib.name >= D.cmdsize)
return malformedError("load command " + Twine(LoadCommandIndex) + " " +
CmdName + " name.offset field extends past the end "
"of the load command");
// Make sure there is a null between the starting offset of the name and
// the end of the load command.
uint32_t i;
const char *P = (const char *)Load.Ptr;
for (i = D.dylib.name; i < D.cmdsize; i++)
if (P[i] == '\0')
break;
if (i >= D.cmdsize)
return malformedError("load command " + Twine(LoadCommandIndex) + " " +
CmdName + " library name extends past the end of the "
"load command");
return Error::success();
}
static Error checkDylibIdCommand(const MachOObjectFile &Obj,
const MachOObjectFile::LoadCommandInfo &Load,
uint32_t LoadCommandIndex,
const char **LoadCmd) {
if (Error Err = checkDylibCommand(Obj, Load, LoadCommandIndex,
"LC_ID_DYLIB"))
return Err;
if (*LoadCmd != nullptr)
return malformedError("more than one LC_ID_DYLIB command");
if (Obj.getHeader().filetype != MachO::MH_DYLIB &&
Obj.getHeader().filetype != MachO::MH_DYLIB_STUB)
return malformedError("LC_ID_DYLIB load command in non-dynamic library "
"file type");
*LoadCmd = Load.Ptr;
return Error::success();
}
static Error checkDyldCommand(const MachOObjectFile &Obj,
const MachOObjectFile::LoadCommandInfo &Load,
uint32_t LoadCommandIndex, const char *CmdName) {
if (Load.C.cmdsize < sizeof(MachO::dylinker_command))
return malformedError("load command " + Twine(LoadCommandIndex) + " " +
CmdName + " cmdsize too small");
MachO::dylinker_command D = getStruct<MachO::dylinker_command>(Obj, Load.Ptr);
if (D.name < sizeof(MachO::dylinker_command))
return malformedError("load command " + Twine(LoadCommandIndex) + " " +
CmdName + " name.offset field too small, not past "
"the end of the dylinker_command struct");
if (D.name >= D.cmdsize)
return malformedError("load command " + Twine(LoadCommandIndex) + " " +
CmdName + " name.offset field extends past the end "
"of the load command");
// Make sure there is a null between the starting offset of the name and
// the end of the load command.
uint32_t i;
const char *P = (const char *)Load.Ptr;
for (i = D.name; i < D.cmdsize; i++)
if (P[i] == '\0')
break;
if (i >= D.cmdsize)
return malformedError("load command " + Twine(LoadCommandIndex) + " " +
CmdName + " dyld name extends past the end of the "
"load command");
return Error::success();
}
static Error checkVersCommand(const MachOObjectFile &Obj,
const MachOObjectFile::LoadCommandInfo &Load,
uint32_t LoadCommandIndex,
const char **LoadCmd, const char *CmdName) {
if (Load.C.cmdsize != sizeof(MachO::version_min_command))
return malformedError("load command " + Twine(LoadCommandIndex) + " " +
CmdName + " has incorrect cmdsize");
if (*LoadCmd != nullptr)
return malformedError("more than one LC_VERSION_MIN_MACOSX, "
"LC_VERSION_MIN_IPHONEOS, LC_VERSION_MIN_TVOS or "
"LC_VERSION_MIN_WATCHOS command");
*LoadCmd = Load.Ptr;
return Error::success();
}
static Error checkNoteCommand(const MachOObjectFile &Obj,
const MachOObjectFile::LoadCommandInfo &Load,
uint32_t LoadCommandIndex,
std::list<MachOElement> &Elements) {
if (Load.C.cmdsize != sizeof(MachO::note_command))
return malformedError("load command " + Twine(LoadCommandIndex) +
" LC_NOTE has incorrect cmdsize");
MachO::note_command Nt = getStruct<MachO::note_command>(Obj, Load.Ptr);
uint64_t FileSize = Obj.getData().size();
if (Nt.offset > FileSize)
return malformedError("offset field of LC_NOTE command " +
Twine(LoadCommandIndex) + " extends "
"past the end of the file");
uint64_t BigSize = Nt.offset;
BigSize += Nt.size;
if (BigSize > FileSize)
return malformedError("size field plus offset field of LC_NOTE command " +
Twine(LoadCommandIndex) + " extends past the end of "
"the file");
if (Error Err = checkOverlappingElement(Elements, Nt.offset, Nt.size,
"LC_NOTE data"))
return Err;
return Error::success();
}
static Error
parseBuildVersionCommand(const MachOObjectFile &Obj,
const MachOObjectFile::LoadCommandInfo &Load,
SmallVectorImpl<const char*> &BuildTools,
uint32_t LoadCommandIndex) {
MachO::build_version_command BVC =
getStruct<MachO::build_version_command>(Obj, Load.Ptr);
if (Load.C.cmdsize !=
sizeof(MachO::build_version_command) +
BVC.ntools * sizeof(MachO::build_tool_version))
return malformedError("load command " + Twine(LoadCommandIndex) +
" LC_BUILD_VERSION_COMMAND has incorrect cmdsize");
auto Start = Load.Ptr + sizeof(MachO::build_version_command);
BuildTools.resize(BVC.ntools);
for (unsigned i = 0; i < BVC.ntools; ++i)
BuildTools[i] = Start + i * sizeof(MachO::build_tool_version);
return Error::success();
}
static Error checkRpathCommand(const MachOObjectFile &Obj,
const MachOObjectFile::LoadCommandInfo &Load,
uint32_t LoadCommandIndex) {
if (Load.C.cmdsize < sizeof(MachO::rpath_command))
return malformedError("load command " + Twine(LoadCommandIndex) +
" LC_RPATH cmdsize too small");
MachO::rpath_command R = getStruct<MachO::rpath_command>(Obj, Load.Ptr);
if (R.path < sizeof(MachO::rpath_command))
return malformedError("load command " + Twine(LoadCommandIndex) +
" LC_RPATH path.offset field too small, not past "
"the end of the rpath_command struct");
if (R.path >= R.cmdsize)
return malformedError("load command " + Twine(LoadCommandIndex) +
" LC_RPATH path.offset field extends past the end "
"of the load command");
// Make sure there is a null between the starting offset of the path and
// the end of the load command.
uint32_t i;
const char *P = (const char *)Load.Ptr;
for (i = R.path; i < R.cmdsize; i++)
if (P[i] == '\0')
break;
if (i >= R.cmdsize)
return malformedError("load command " + Twine(LoadCommandIndex) +
" LC_RPATH library name extends past the end of the "
"load command");
return Error::success();
}
static Error checkEncryptCommand(const MachOObjectFile &Obj,
const MachOObjectFile::LoadCommandInfo &Load,
uint32_t LoadCommandIndex,
uint64_t cryptoff, uint64_t cryptsize,
const char **LoadCmd, const char *CmdName) {
if (*LoadCmd != nullptr)
return malformedError("more than one LC_ENCRYPTION_INFO and or "
"LC_ENCRYPTION_INFO_64 command");
uint64_t FileSize = Obj.getData().size();
if (cryptoff > FileSize)
return malformedError("cryptoff field of " + Twine(CmdName) +
" command " + Twine(LoadCommandIndex) + " extends "
"past the end of the file");
uint64_t BigSize = cryptoff;
BigSize += cryptsize;
if (BigSize > FileSize)
return malformedError("cryptoff field plus cryptsize field of " +
Twine(CmdName) + " command " +
Twine(LoadCommandIndex) + " extends past the end of "
"the file");
*LoadCmd = Load.Ptr;
return Error::success();
}
static Error checkLinkerOptCommand(const MachOObjectFile &Obj,
const MachOObjectFile::LoadCommandInfo &Load,
uint32_t LoadCommandIndex) {
if (Load.C.cmdsize < sizeof(MachO::linker_option_command))
return malformedError("load command " + Twine(LoadCommandIndex) +
" LC_LINKER_OPTION cmdsize too small");
MachO::linker_option_command L =
getStruct<MachO::linker_option_command>(Obj, Load.Ptr);
// Make sure the count of strings is correct.
const char *string = (const char *)Load.Ptr +
sizeof(struct MachO::linker_option_command);
uint32_t left = L.cmdsize - sizeof(struct MachO::linker_option_command);
uint32_t i = 0;
while (left > 0) {
while (*string == '\0' && left > 0) {
string++;
left--;
}
if (left > 0) {
i++;
uint32_t NullPos = StringRef(string, left).find('\0');
uint32_t len = std::min(NullPos, left) + 1;
string += len;
left -= len;
}
}
if (L.count != i)
return malformedError("load command " + Twine(LoadCommandIndex) +
" LC_LINKER_OPTION string count " + Twine(L.count) +
" does not match number of strings");
return Error::success();
}
static Error checkSubCommand(const MachOObjectFile &Obj,
const MachOObjectFile::LoadCommandInfo &Load,
uint32_t LoadCommandIndex, const char *CmdName,
size_t SizeOfCmd, const char *CmdStructName,
uint32_t PathOffset, const char *PathFieldName) {
if (PathOffset < SizeOfCmd)
return malformedError("load command " + Twine(LoadCommandIndex) + " " +
CmdName + " " + PathFieldName + ".offset field too "
"small, not past the end of the " + CmdStructName);
if (PathOffset >= Load.C.cmdsize)
return malformedError("load command " + Twine(LoadCommandIndex) + " " +
CmdName + " " + PathFieldName + ".offset field "
"extends past the end of the load command");
// Make sure there is a null between the starting offset of the path and
// the end of the load command.
uint32_t i;
const char *P = (const char *)Load.Ptr;
for (i = PathOffset; i < Load.C.cmdsize; i++)
if (P[i] == '\0')
break;
if (i >= Load.C.cmdsize)
return malformedError("load command " + Twine(LoadCommandIndex) + " " +
CmdName + " " + PathFieldName + " name extends past "
"the end of the load command");
return Error::success();
}
static Error checkThreadCommand(const MachOObjectFile &Obj,
const MachOObjectFile::LoadCommandInfo &Load,
uint32_t LoadCommandIndex,
const char *CmdName) {
if (Load.C.cmdsize < sizeof(MachO::thread_command))
return malformedError("load command " + Twine(LoadCommandIndex) +
CmdName + " cmdsize too small");
MachO::thread_command T =
getStruct<MachO::thread_command>(Obj, Load.Ptr);
const char *state = Load.Ptr + sizeof(MachO::thread_command);
const char *end = Load.Ptr + T.cmdsize;
uint32_t nflavor = 0;
uint32_t cputype = getCPUType(Obj);
while (state < end) {
if(state + sizeof(uint32_t) > end)
return malformedError("load command " + Twine(LoadCommandIndex) +
"flavor in " + CmdName + " extends past end of "
"command");
uint32_t flavor;
memcpy(&flavor, state, sizeof(uint32_t));
if (Obj.isLittleEndian() != sys::IsLittleEndianHost)
sys::swapByteOrder(flavor);
state += sizeof(uint32_t);
if(state + sizeof(uint32_t) > end)
return malformedError("load command " + Twine(LoadCommandIndex) +
" count in " + CmdName + " extends past end of "
"command");
uint32_t count;
memcpy(&count, state, sizeof(uint32_t));
if (Obj.isLittleEndian() != sys::IsLittleEndianHost)
sys::swapByteOrder(count);
state += sizeof(uint32_t);
if (cputype == MachO::CPU_TYPE_I386) {
if (flavor == MachO::x86_THREAD_STATE32) {
if (count != MachO::x86_THREAD_STATE32_COUNT)
return malformedError("load command " + Twine(LoadCommandIndex) +
" count not x86_THREAD_STATE32_COUNT for "
"flavor number " + Twine(nflavor) + " which is "
"a x86_THREAD_STATE32 flavor in " + CmdName +
" command");
if (state + sizeof(MachO::x86_thread_state32_t) > end)
return malformedError("load command " + Twine(LoadCommandIndex) +
" x86_THREAD_STATE32 extends past end of "
"command in " + CmdName + " command");
state += sizeof(MachO::x86_thread_state32_t);
} else {
return malformedError("load command " + Twine(LoadCommandIndex) +
" unknown flavor (" + Twine(flavor) + ") for "
"flavor number " + Twine(nflavor) + " in " +
CmdName + " command");
}
} else if (cputype == MachO::CPU_TYPE_X86_64) {
if (flavor == MachO::x86_THREAD_STATE64) {
if (count != MachO::x86_THREAD_STATE64_COUNT)
return malformedError("load command " + Twine(LoadCommandIndex) +
" count not x86_THREAD_STATE64_COUNT for "
"flavor number " + Twine(nflavor) + " which is "
"a x86_THREAD_STATE64 flavor in " + CmdName +
" command");
if (state + sizeof(MachO::x86_thread_state64_t) > end)
return malformedError("load command " + Twine(LoadCommandIndex) +
" x86_THREAD_STATE64 extends past end of "
"command in " + CmdName + " command");
state += sizeof(MachO::x86_thread_state64_t);
} else {
return malformedError("load command " + Twine(LoadCommandIndex) +
" unknown flavor (" + Twine(flavor) + ") for "
"flavor number " + Twine(nflavor) + " in " +
CmdName + " command");
}
} else if (cputype == MachO::CPU_TYPE_ARM) {
if (flavor == MachO::ARM_THREAD_STATE) {
if (count != MachO::ARM_THREAD_STATE_COUNT)
return malformedError("load command " + Twine(LoadCommandIndex) +
" count not ARM_THREAD_STATE_COUNT for "
"flavor number " + Twine(nflavor) + " which is "
"a ARM_THREAD_STATE flavor in " + CmdName +
" command");
if (state + sizeof(MachO::arm_thread_state32_t) > end)
return malformedError("load command " + Twine(LoadCommandIndex) +
" ARM_THREAD_STATE extends past end of "
"command in " + CmdName + " command");
state += sizeof(MachO::arm_thread_state32_t);
} else {
return malformedError("load command " + Twine(LoadCommandIndex) +
" unknown flavor (" + Twine(flavor) + ") for "
"flavor number " + Twine(nflavor) + " in " +
CmdName + " command");
}
} else if (cputype == MachO::CPU_TYPE_ARM64) {
if (flavor == MachO::ARM_THREAD_STATE64) {
if (count != MachO::ARM_THREAD_STATE64_COUNT)
return malformedError("load command " + Twine(LoadCommandIndex) +
" count not ARM_THREAD_STATE64_COUNT for "
"flavor number " + Twine(nflavor) + " which is "
"a ARM_THREAD_STATE64 flavor in " + CmdName +
" command");
if (state + sizeof(MachO::arm_thread_state64_t) > end)
return malformedError("load command " + Twine(LoadCommandIndex) +
" ARM_THREAD_STATE64 extends past end of "
"command in " + CmdName + " command");
state += sizeof(MachO::arm_thread_state64_t);
} else {
return malformedError("load command " + Twine(LoadCommandIndex) +
" unknown flavor (" + Twine(flavor) + ") for "
"flavor number " + Twine(nflavor) + " in " +
CmdName + " command");
}
} else if (cputype == MachO::CPU_TYPE_POWERPC) {
if (flavor == MachO::PPC_THREAD_STATE) {
if (count != MachO::PPC_THREAD_STATE_COUNT)
return malformedError("load command " + Twine(LoadCommandIndex) +
" count not PPC_THREAD_STATE_COUNT for "
"flavor number " + Twine(nflavor) + " which is "
"a PPC_THREAD_STATE flavor in " + CmdName +
" command");
if (state + sizeof(MachO::ppc_thread_state32_t) > end)
return malformedError("load command " + Twine(LoadCommandIndex) +
" PPC_THREAD_STATE extends past end of "
"command in " + CmdName + " command");
state += sizeof(MachO::ppc_thread_state32_t);
} else {
return malformedError("load command " + Twine(LoadCommandIndex) +
" unknown flavor (" + Twine(flavor) + ") for "
"flavor number " + Twine(nflavor) + " in " +
CmdName + " command");
}
} else {
return malformedError("unknown cputype (" + Twine(cputype) + ") load "
"command " + Twine(LoadCommandIndex) + " for " +
CmdName + " command can't be checked");
}
nflavor++;
}
return Error::success();
}
static Error checkTwoLevelHintsCommand(const MachOObjectFile &Obj,
const MachOObjectFile::LoadCommandInfo
&Load,
uint32_t LoadCommandIndex,
const char **LoadCmd,
std::list<MachOElement> &Elements) {
if (Load.C.cmdsize != sizeof(MachO::twolevel_hints_command))
return malformedError("load command " + Twine(LoadCommandIndex) +
" LC_TWOLEVEL_HINTS has incorrect cmdsize");
if (*LoadCmd != nullptr)
return malformedError("more than one LC_TWOLEVEL_HINTS command");
MachO::twolevel_hints_command Hints =
getStruct<MachO::twolevel_hints_command>(Obj, Load.Ptr);
uint64_t FileSize = Obj.getData().size();
if (Hints.offset > FileSize)
return malformedError("offset field of LC_TWOLEVEL_HINTS command " +
Twine(LoadCommandIndex) + " extends past the end of "
"the file");
uint64_t BigSize = Hints.nhints;
BigSize *= Hints.nhints * sizeof(MachO::twolevel_hint);
BigSize += Hints.offset;
if (BigSize > FileSize)
return malformedError("offset field plus nhints times sizeof(struct "
"twolevel_hint) field of LC_TWOLEVEL_HINTS command " +
Twine(LoadCommandIndex) + " extends past the end of "
"the file");
if (Error Err = checkOverlappingElement(Elements, Hints.offset, Hints.nhints *
sizeof(MachO::twolevel_hint),
"two level hints"))
return Err;
*LoadCmd = Load.Ptr;
return Error::success();
}
// Returns true if the libObject code does not support the load command and its
// contents. The cmd value it is treated as an unknown load command but with
// an error message that says the cmd value is obsolete.
static bool isLoadCommandObsolete(uint32_t cmd) {
if (cmd == MachO::LC_SYMSEG ||
cmd == MachO::LC_LOADFVMLIB ||
cmd == MachO::LC_IDFVMLIB ||
cmd == MachO::LC_IDENT ||
cmd == MachO::LC_FVMFILE ||
cmd == MachO::LC_PREPAGE ||
cmd == MachO::LC_PREBOUND_DYLIB ||
cmd == MachO::LC_TWOLEVEL_HINTS ||
cmd == MachO::LC_PREBIND_CKSUM)
return true;
return false;
}
Expected<std::unique_ptr<MachOObjectFile>>
MachOObjectFile::create(MemoryBufferRef Object, bool IsLittleEndian,
bool Is64Bits, uint32_t UniversalCputype,
uint32_t UniversalIndex) {
Error Err = Error::success();
std::unique_ptr<MachOObjectFile> Obj(
new MachOObjectFile(std::move(Object), IsLittleEndian,
Is64Bits, Err, UniversalCputype,
UniversalIndex));
if (Err)
return std::move(Err);
return std::move(Obj);
}
MachOObjectFile::MachOObjectFile(MemoryBufferRef Object, bool IsLittleEndian,
bool Is64bits, Error &Err,
uint32_t UniversalCputype,
uint32_t UniversalIndex)
: ObjectFile(getMachOType(IsLittleEndian, Is64bits), Object) {
ErrorAsOutParameter ErrAsOutParam(&Err);
uint64_t SizeOfHeaders;
uint32_t cputype;
if (is64Bit()) {
parseHeader(*this, Header64, Err);
SizeOfHeaders = sizeof(MachO::mach_header_64);
cputype = Header64.cputype;
} else {
parseHeader(*this, Header, Err);
SizeOfHeaders = sizeof(MachO::mach_header);
cputype = Header.cputype;
}
if (Err)
return;
SizeOfHeaders += getHeader().sizeofcmds;
if (getData().data() + SizeOfHeaders > getData().end()) {
Err = malformedError("load commands extend past the end of the file");
return;
}
if (UniversalCputype != 0 && cputype != UniversalCputype) {
Err = malformedError("universal header architecture: " +
Twine(UniversalIndex) + "'s cputype does not match "
"object file's mach header");
return;
}
std::list<MachOElement> Elements;
Elements.push_back({0, SizeOfHeaders, "Mach-O headers"});
uint32_t LoadCommandCount = getHeader().ncmds;
LoadCommandInfo Load;
if (LoadCommandCount != 0) {
if (auto LoadOrErr = getFirstLoadCommandInfo(*this))
Load = *LoadOrErr;
else {
Err = LoadOrErr.takeError();
return;
}
}
const char *DyldIdLoadCmd = nullptr;
const char *FuncStartsLoadCmd = nullptr;
const char *SplitInfoLoadCmd = nullptr;
const char *CodeSignDrsLoadCmd = nullptr;
const char *CodeSignLoadCmd = nullptr;
const char *VersLoadCmd = nullptr;
const char *SourceLoadCmd = nullptr;
const char *EntryPointLoadCmd = nullptr;
const char *EncryptLoadCmd = nullptr;
const char *RoutinesLoadCmd = nullptr;
const char *UnixThreadLoadCmd = nullptr;
const char *TwoLevelHintsLoadCmd = nullptr;
for (unsigned I = 0; I < LoadCommandCount; ++I) {
if (is64Bit()) {
if (Load.C.cmdsize % 8 != 0) {
// We have a hack here to allow 64-bit Mach-O core files to have
// LC_THREAD commands that are only a multiple of 4 and not 8 to be
// allowed since the macOS kernel produces them.
if (getHeader().filetype != MachO::MH_CORE ||
Load.C.cmd != MachO::LC_THREAD || Load.C.cmdsize % 4) {
Err = malformedError("load command " + Twine(I) + " cmdsize not a "
"multiple of 8");
return;
}
}
} else {
if (Load.C.cmdsize % 4 != 0) {
Err = malformedError("load command " + Twine(I) + " cmdsize not a "
"multiple of 4");
return;
}
}
LoadCommands.push_back(Load);
if (Load.C.cmd == MachO::LC_SYMTAB) {
if ((Err = checkSymtabCommand(*this, Load, I, &SymtabLoadCmd, Elements)))
return;
} else if (Load.C.cmd == MachO::LC_DYSYMTAB) {
if ((Err = checkDysymtabCommand(*this, Load, I, &DysymtabLoadCmd,
Elements)))
return;
} else if (Load.C.cmd == MachO::LC_DATA_IN_CODE) {
if ((Err = checkLinkeditDataCommand(*this, Load, I, &DataInCodeLoadCmd,
"LC_DATA_IN_CODE", Elements,
"data in code info")))
return;
} else if (Load.C.cmd == MachO::LC_LINKER_OPTIMIZATION_HINT) {
if ((Err = checkLinkeditDataCommand(*this, Load, I, &LinkOptHintsLoadCmd,
"LC_LINKER_OPTIMIZATION_HINT",
Elements, "linker optimization "
"hints")))
return;
} else if (Load.C.cmd == MachO::LC_FUNCTION_STARTS) {
if ((Err = checkLinkeditDataCommand(*this, Load, I, &FuncStartsLoadCmd,
"LC_FUNCTION_STARTS", Elements,
"function starts data")))
return;
} else if (Load.C.cmd == MachO::LC_SEGMENT_SPLIT_INFO) {
if ((Err = checkLinkeditDataCommand(*this, Load, I, &SplitInfoLoadCmd,
"LC_SEGMENT_SPLIT_INFO", Elements,
"split info data")))
return;
} else if (Load.C.cmd == MachO::LC_DYLIB_CODE_SIGN_DRS) {
if ((Err = checkLinkeditDataCommand(*this, Load, I, &CodeSignDrsLoadCmd,
"LC_DYLIB_CODE_SIGN_DRS", Elements,
"code signing RDs data")))
return;
} else if (Load.C.cmd == MachO::LC_CODE_SIGNATURE) {
if ((Err = checkLinkeditDataCommand(*this, Load, I, &CodeSignLoadCmd,
"LC_CODE_SIGNATURE", Elements,
"code signature data")))
return;
} else if (Load.C.cmd == MachO::LC_DYLD_INFO) {
if ((Err = checkDyldInfoCommand(*this, Load, I, &DyldInfoLoadCmd,
"LC_DYLD_INFO", Elements)))
return;
} else if (Load.C.cmd == MachO::LC_DYLD_INFO_ONLY) {
if ((Err = checkDyldInfoCommand(*this, Load, I, &DyldInfoLoadCmd,
"LC_DYLD_INFO_ONLY", Elements)))
return;
} else if (Load.C.cmd == MachO::LC_UUID) {
if (Load.C.cmdsize != sizeof(MachO::uuid_command)) {
Err = malformedError("LC_UUID command " + Twine(I) + " has incorrect "
"cmdsize");
return;
}
if (UuidLoadCmd) {
Err = malformedError("more than one LC_UUID command");
return;
}
UuidLoadCmd = Load.Ptr;
} else if (Load.C.cmd == MachO::LC_SEGMENT_64) {
if ((Err = parseSegmentLoadCommand<MachO::segment_command_64,
MachO::section_64>(
*this, Load, Sections, HasPageZeroSegment, I,
"LC_SEGMENT_64", SizeOfHeaders, Elements)))
return;
} else if (Load.C.cmd == MachO::LC_SEGMENT) {
if ((Err = parseSegmentLoadCommand<MachO::segment_command,
MachO::section>(
*this, Load, Sections, HasPageZeroSegment, I,
"LC_SEGMENT", SizeOfHeaders, Elements)))
return;
} else if (Load.C.cmd == MachO::LC_ID_DYLIB) {
if ((Err = checkDylibIdCommand(*this, Load, I, &DyldIdLoadCmd)))
return;
} else if (Load.C.cmd == MachO::LC_LOAD_DYLIB) {
if ((Err = checkDylibCommand(*this, Load, I, "LC_LOAD_DYLIB")))
return;
Libraries.push_back(Load.Ptr);
} else if (Load.C.cmd == MachO::LC_LOAD_WEAK_DYLIB) {
if ((Err = checkDylibCommand(*this, Load, I, "LC_LOAD_WEAK_DYLIB")))
return;
Libraries.push_back(Load.Ptr);
} else if (Load.C.cmd == MachO::LC_LAZY_LOAD_DYLIB) {
if ((Err = checkDylibCommand(*this, Load, I, "LC_LAZY_LOAD_DYLIB")))
return;
Libraries.push_back(Load.Ptr);
} else if (Load.C.cmd == MachO::LC_REEXPORT_DYLIB) {
if ((Err = checkDylibCommand(*this, Load, I, "LC_REEXPORT_DYLIB")))
return;
Libraries.push_back(Load.Ptr);
} else if (Load.C.cmd == MachO::LC_LOAD_UPWARD_DYLIB) {
if ((Err = checkDylibCommand(*this, Load, I, "LC_LOAD_UPWARD_DYLIB")))
return;
Libraries.push_back(Load.Ptr);
} else if (Load.C.cmd == MachO::LC_ID_DYLINKER) {
if ((Err = checkDyldCommand(*this, Load, I, "LC_ID_DYLINKER")))
return;
} else if (Load.C.cmd == MachO::LC_LOAD_DYLINKER) {
if ((Err = checkDyldCommand(*this, Load, I, "LC_LOAD_DYLINKER")))
return;
} else if (Load.C.cmd == MachO::LC_DYLD_ENVIRONMENT) {
if ((Err = checkDyldCommand(*this, Load, I, "LC_DYLD_ENVIRONMENT")))
return;
} else if (Load.C.cmd == MachO::LC_VERSION_MIN_MACOSX) {
if ((Err = checkVersCommand(*this, Load, I, &VersLoadCmd,
"LC_VERSION_MIN_MACOSX")))
return;
} else if (Load.C.cmd == MachO::LC_VERSION_MIN_IPHONEOS) {
if ((Err = checkVersCommand(*this, Load, I, &VersLoadCmd,
"LC_VERSION_MIN_IPHONEOS")))
return;
} else if (Load.C.cmd == MachO::LC_VERSION_MIN_TVOS) {
if ((Err = checkVersCommand(*this, Load, I, &VersLoadCmd,
"LC_VERSION_MIN_TVOS")))
return;
} else if (Load.C.cmd == MachO::LC_VERSION_MIN_WATCHOS) {
if ((Err = checkVersCommand(*this, Load, I, &VersLoadCmd,
"LC_VERSION_MIN_WATCHOS")))
return;
} else if (Load.C.cmd == MachO::LC_NOTE) {
if ((Err = checkNoteCommand(*this, Load, I, Elements)))
return;
} else if (Load.C.cmd == MachO::LC_BUILD_VERSION) {
if ((Err = parseBuildVersionCommand(*this, Load, BuildTools, I)))
return;
} else if (Load.C.cmd == MachO::LC_RPATH) {
if ((Err = checkRpathCommand(*this, Load, I)))
return;
} else if (Load.C.cmd == MachO::LC_SOURCE_VERSION) {
if (Load.C.cmdsize != sizeof(MachO::source_version_command)) {
Err = malformedError("LC_SOURCE_VERSION command " + Twine(I) +
" has incorrect cmdsize");
return;
}
if (SourceLoadCmd) {
Err = malformedError("more than one LC_SOURCE_VERSION command");
return;
}
SourceLoadCmd = Load.Ptr;
} else if (Load.C.cmd == MachO::LC_MAIN) {
if (Load.C.cmdsize != sizeof(MachO::entry_point_command)) {
Err = malformedError("LC_MAIN command " + Twine(I) +
" has incorrect cmdsize");
return;
}
if (EntryPointLoadCmd) {
Err = malformedError("more than one LC_MAIN command");
return;
}
EntryPointLoadCmd = Load.Ptr;
} else if (Load.C.cmd == MachO::LC_ENCRYPTION_INFO) {
if (Load.C.cmdsize != sizeof(MachO::encryption_info_command)) {
Err = malformedError("LC_ENCRYPTION_INFO command " + Twine(I) +
" has incorrect cmdsize");
return;
}
MachO::encryption_info_command E =
getStruct<MachO::encryption_info_command>(*this, Load.Ptr);
if ((Err = checkEncryptCommand(*this, Load, I, E.cryptoff, E.cryptsize,
&EncryptLoadCmd, "LC_ENCRYPTION_INFO")))
return;
} else if (Load.C.cmd == MachO::LC_ENCRYPTION_INFO_64) {
if (Load.C.cmdsize != sizeof(MachO::encryption_info_command_64)) {
Err = malformedError("LC_ENCRYPTION_INFO_64 command " + Twine(I) +
" has incorrect cmdsize");
return;
}
MachO::encryption_info_command_64 E =
getStruct<MachO::encryption_info_command_64>(*this, Load.Ptr);
if ((Err = checkEncryptCommand(*this, Load, I, E.cryptoff, E.cryptsize,
&EncryptLoadCmd, "LC_ENCRYPTION_INFO_64")))
return;
} else if (Load.C.cmd == MachO::LC_LINKER_OPTION) {
if ((Err = checkLinkerOptCommand(*this, Load, I)))
return;
} else if (Load.C.cmd == MachO::LC_SUB_FRAMEWORK) {
if (Load.C.cmdsize < sizeof(MachO::sub_framework_command)) {
Err = malformedError("load command " + Twine(I) +
" LC_SUB_FRAMEWORK cmdsize too small");
return;
}
MachO::sub_framework_command S =
getStruct<MachO::sub_framework_command>(*this, Load.Ptr);
if ((Err = checkSubCommand(*this, Load, I, "LC_SUB_FRAMEWORK",
sizeof(MachO::sub_framework_command),
"sub_framework_command", S.umbrella,
"umbrella")))
return;
} else if (Load.C.cmd == MachO::LC_SUB_UMBRELLA) {
if (Load.C.cmdsize < sizeof(MachO::sub_umbrella_command)) {
Err = malformedError("load command " + Twine(I) +
" LC_SUB_UMBRELLA cmdsize too small");
return;
}
MachO::sub_umbrella_command S =
getStruct<MachO::sub_umbrella_command>(*this, Load.Ptr);
if ((Err = checkSubCommand(*this, Load, I, "LC_SUB_UMBRELLA",
sizeof(MachO::sub_umbrella_command),
"sub_umbrella_command", S.sub_umbrella,
"sub_umbrella")))
return;
} else if (Load.C.cmd == MachO::LC_SUB_LIBRARY) {
if (Load.C.cmdsize < sizeof(MachO::sub_library_command)) {
Err = malformedError("load command " + Twine(I) +
" LC_SUB_LIBRARY cmdsize too small");
return;
}
MachO::sub_library_command S =
getStruct<MachO::sub_library_command>(*this, Load.Ptr);
if ((Err = checkSubCommand(*this, Load, I, "LC_SUB_LIBRARY",
sizeof(MachO::sub_library_command),
"sub_library_command", S.sub_library,
"sub_library")))
return;
} else if (Load.C.cmd == MachO::LC_SUB_CLIENT) {
if (Load.C.cmdsize < sizeof(MachO::sub_client_command)) {
Err = malformedError("load command " + Twine(I) +
" LC_SUB_CLIENT cmdsize too small");
return;
}
MachO::sub_client_command S =
getStruct<MachO::sub_client_command>(*this, Load.Ptr);
if ((Err = checkSubCommand(*this, Load, I, "LC_SUB_CLIENT",
sizeof(MachO::sub_client_command),
"sub_client_command", S.client, "client")))
return;
} else if (Load.C.cmd == MachO::LC_ROUTINES) {
if (Load.C.cmdsize != sizeof(MachO::routines_command)) {
Err = malformedError("LC_ROUTINES command " + Twine(I) +
" has incorrect cmdsize");
return;
}
if (RoutinesLoadCmd) {
Err = malformedError("more than one LC_ROUTINES and or LC_ROUTINES_64 "
"command");
return;
}
RoutinesLoadCmd = Load.Ptr;
} else if (Load.C.cmd == MachO::LC_ROUTINES_64) {
if (Load.C.cmdsize != sizeof(MachO::routines_command_64)) {
Err = malformedError("LC_ROUTINES_64 command " + Twine(I) +
" has incorrect cmdsize");
return;
}
if (RoutinesLoadCmd) {
Err = malformedError("more than one LC_ROUTINES_64 and or LC_ROUTINES "
"command");
return;
}
RoutinesLoadCmd = Load.Ptr;
} else if (Load.C.cmd == MachO::LC_UNIXTHREAD) {
if ((Err = checkThreadCommand(*this, Load, I, "LC_UNIXTHREAD")))
return;
if (UnixThreadLoadCmd) {
Err = malformedError("more than one LC_UNIXTHREAD command");
return;
}
UnixThreadLoadCmd = Load.Ptr;
} else if (Load.C.cmd == MachO::LC_THREAD) {
if ((Err = checkThreadCommand(*this, Load, I, "LC_THREAD")))
return;
// Note: LC_TWOLEVEL_HINTS is really obsolete and is not supported.
} else if (Load.C.cmd == MachO::LC_TWOLEVEL_HINTS) {
if ((Err = checkTwoLevelHintsCommand(*this, Load, I,
&TwoLevelHintsLoadCmd, Elements)))
return;
} else if (isLoadCommandObsolete(Load.C.cmd)) {
Err = malformedError("load command " + Twine(I) + " for cmd value of: " +
Twine(Load.C.cmd) + " is obsolete and not "
"supported");
return;
}
// TODO: generate a error for unknown load commands by default. But still
// need work out an approach to allow or not allow unknown values like this
// as an option for some uses like lldb.
if (I < LoadCommandCount - 1) {
if (auto LoadOrErr = getNextLoadCommandInfo(*this, I, Load))
Load = *LoadOrErr;
else {
Err = LoadOrErr.takeError();
return;
}
}
}
if (!SymtabLoadCmd) {
if (DysymtabLoadCmd) {
Err = malformedError("contains LC_DYSYMTAB load command without a "
"LC_SYMTAB load command");
return;
}
} else if (DysymtabLoadCmd) {
MachO::symtab_command Symtab =
getStruct<MachO::symtab_command>(*this, SymtabLoadCmd);
MachO::dysymtab_command Dysymtab =
getStruct<MachO::dysymtab_command>(*this, DysymtabLoadCmd);
if (Dysymtab.nlocalsym != 0 && Dysymtab.ilocalsym > Symtab.nsyms) {
Err = malformedError("ilocalsym in LC_DYSYMTAB load command "
"extends past the end of the symbol table");
return;
}
uint64_t BigSize = Dysymtab.ilocalsym;
BigSize += Dysymtab.nlocalsym;
if (Dysymtab.nlocalsym != 0 && BigSize > Symtab.nsyms) {
Err = malformedError("ilocalsym plus nlocalsym in LC_DYSYMTAB load "
"command extends past the end of the symbol table");
return;
}
if (Dysymtab.nextdefsym != 0 && Dysymtab.ilocalsym > Symtab.nsyms) {
Err = malformedError("nextdefsym in LC_DYSYMTAB load command "
"extends past the end of the symbol table");
return;
}
BigSize = Dysymtab.iextdefsym;
BigSize += Dysymtab.nextdefsym;
if (Dysymtab.nextdefsym != 0 && BigSize > Symtab.nsyms) {
Err = malformedError("iextdefsym plus nextdefsym in LC_DYSYMTAB "
"load command extends past the end of the symbol "
"table");
return;
}
if (Dysymtab.nundefsym != 0 && Dysymtab.iundefsym > Symtab.nsyms) {
Err = malformedError("nundefsym in LC_DYSYMTAB load command "
"extends past the end of the symbol table");
return;
}
BigSize = Dysymtab.iundefsym;
BigSize += Dysymtab.nundefsym;
if (Dysymtab.nundefsym != 0 && BigSize > Symtab.nsyms) {
Err = malformedError("iundefsym plus nundefsym in LC_DYSYMTAB load "
" command extends past the end of the symbol table");
return;
}
}
if ((getHeader().filetype == MachO::MH_DYLIB ||
getHeader().filetype == MachO::MH_DYLIB_STUB) &&
DyldIdLoadCmd == nullptr) {
Err = malformedError("no LC_ID_DYLIB load command in dynamic library "
"filetype");
return;
}
assert(LoadCommands.size() == LoadCommandCount);
Err = Error::success();
}
Error MachOObjectFile::checkSymbolTable() const {
uint32_t Flags = 0;
if (is64Bit()) {
MachO::mach_header_64 H_64 = MachOObjectFile::getHeader64();
Flags = H_64.flags;
} else {
MachO::mach_header H = MachOObjectFile::getHeader();
Flags = H.flags;
}
uint8_t NType = 0;
uint8_t NSect = 0;
uint16_t NDesc = 0;
uint32_t NStrx = 0;
uint64_t NValue = 0;
uint32_t SymbolIndex = 0;
MachO::symtab_command S = getSymtabLoadCommand();
for (const SymbolRef &Symbol : symbols()) {
DataRefImpl SymDRI = Symbol.getRawDataRefImpl();
if (is64Bit()) {
MachO::nlist_64 STE_64 = getSymbol64TableEntry(SymDRI);
NType = STE_64.n_type;
NSect = STE_64.n_sect;
NDesc = STE_64.n_desc;
NStrx = STE_64.n_strx;
NValue = STE_64.n_value;
} else {
MachO::nlist STE = getSymbolTableEntry(SymDRI);
NType = STE.n_type;
NType = STE.n_type;
NSect = STE.n_sect;
NDesc = STE.n_desc;
NStrx = STE.n_strx;
NValue = STE.n_value;
}
if ((NType & MachO::N_STAB) == 0 &&
(NType & MachO::N_TYPE) == MachO::N_SECT) {
if (NSect == 0 || NSect > Sections.size())
return malformedError("bad section index: " + Twine((int)NSect) +
" for symbol at index " + Twine(SymbolIndex));
}
if ((NType & MachO::N_STAB) == 0 &&
(NType & MachO::N_TYPE) == MachO::N_INDR) {
if (NValue >= S.strsize)
return malformedError("bad n_value: " + Twine((int)NValue) + " past "
"the end of string table, for N_INDR symbol at "
"index " + Twine(SymbolIndex));
}
if ((Flags & MachO::MH_TWOLEVEL) == MachO::MH_TWOLEVEL &&
(((NType & MachO::N_TYPE) == MachO::N_UNDF && NValue == 0) ||
(NType & MachO::N_TYPE) == MachO::N_PBUD)) {
uint32_t LibraryOrdinal = MachO::GET_LIBRARY_ORDINAL(NDesc);
if (LibraryOrdinal != 0 &&
LibraryOrdinal != MachO::EXECUTABLE_ORDINAL &&
LibraryOrdinal != MachO::DYNAMIC_LOOKUP_ORDINAL &&
LibraryOrdinal - 1 >= Libraries.size() ) {
return malformedError("bad library ordinal: " + Twine(LibraryOrdinal) +
" for symbol at index " + Twine(SymbolIndex));
}
}
if (NStrx >= S.strsize)
return malformedError("bad string table index: " + Twine((int)NStrx) +
" past the end of string table, for symbol at "
"index " + Twine(SymbolIndex));
SymbolIndex++;
}
return Error::success();
}
void MachOObjectFile::moveSymbolNext(DataRefImpl &Symb) const {
unsigned SymbolTableEntrySize = is64Bit() ?
sizeof(MachO::nlist_64) :
sizeof(MachO::nlist);
Symb.p += SymbolTableEntrySize;
}
Expected<StringRef> MachOObjectFile::getSymbolName(DataRefImpl Symb) const {
StringRef StringTable = getStringTableData();
MachO::nlist_base Entry = getSymbolTableEntryBase(*this, Symb);
const char *Start = &StringTable.data()[Entry.n_strx];
if (Start < getData().begin() || Start >= getData().end()) {
return malformedError("bad string index: " + Twine(Entry.n_strx) +
" for symbol at index " + Twine(getSymbolIndex(Symb)));
}
return StringRef(Start);
}
unsigned MachOObjectFile::getSectionType(SectionRef Sec) const {
DataRefImpl DRI = Sec.getRawDataRefImpl();
uint32_t Flags = getSectionFlags(*this, DRI);
return Flags & MachO::SECTION_TYPE;
}
uint64_t MachOObjectFile::getNValue(DataRefImpl Sym) const {
if (is64Bit()) {
MachO::nlist_64 Entry = getSymbol64TableEntry(Sym);
return Entry.n_value;
}
MachO::nlist Entry = getSymbolTableEntry(Sym);
return Entry.n_value;
}
// getIndirectName() returns the name of the alias'ed symbol who's string table
// index is in the n_value field.
std::error_code MachOObjectFile::getIndirectName(DataRefImpl Symb,
StringRef &Res) const {
StringRef StringTable = getStringTableData();
MachO::nlist_base Entry = getSymbolTableEntryBase(*this, Symb);
if ((Entry.n_type & MachO::N_TYPE) != MachO::N_INDR)
return object_error::parse_failed;
uint64_t NValue = getNValue(Symb);
if (NValue >= StringTable.size())
return object_error::parse_failed;
const char *Start = &StringTable.data()[NValue];
Res = StringRef(Start);
return std::error_code();
}
uint64_t MachOObjectFile::getSymbolValueImpl(DataRefImpl Sym) const {
return getNValue(Sym);
}
Expected<uint64_t> MachOObjectFile::getSymbolAddress(DataRefImpl Sym) const {
return getSymbolValue(Sym);
}
uint32_t MachOObjectFile::getSymbolAlignment(DataRefImpl DRI) const {
uint32_t flags = getSymbolFlags(DRI);
if (flags & SymbolRef::SF_Common) {
MachO::nlist_base Entry = getSymbolTableEntryBase(*this, DRI);
return 1 << MachO::GET_COMM_ALIGN(Entry.n_desc);
}
return 0;
}
uint64_t MachOObjectFile::getCommonSymbolSizeImpl(DataRefImpl DRI) const {
return getNValue(DRI);
}
Expected<SymbolRef::Type>
MachOObjectFile::getSymbolType(DataRefImpl Symb) const {
MachO::nlist_base Entry = getSymbolTableEntryBase(*this, Symb);
uint8_t n_type = Entry.n_type;
// If this is a STAB debugging symbol, we can do nothing more.
if (n_type & MachO::N_STAB)
return SymbolRef::ST_Debug;
switch (n_type & MachO::N_TYPE) {
case MachO::N_UNDF :
return SymbolRef::ST_Unknown;
case MachO::N_SECT :
Expected<section_iterator> SecOrError = getSymbolSection(Symb);
if (!SecOrError)
return SecOrError.takeError();
section_iterator Sec = *SecOrError;
if (Sec->isData() || Sec->isBSS())
return SymbolRef::ST_Data;
return SymbolRef::ST_Function;
}
return SymbolRef::ST_Other;
}
uint32_t MachOObjectFile::getSymbolFlags(DataRefImpl DRI) const {
MachO::nlist_base Entry = getSymbolTableEntryBase(*this, DRI);
uint8_t MachOType = Entry.n_type;
uint16_t MachOFlags = Entry.n_desc;
uint32_t Result = SymbolRef::SF_None;
if ((MachOType & MachO::N_TYPE) == MachO::N_INDR)
Result |= SymbolRef::SF_Indirect;
if (MachOType & MachO::N_STAB)
Result |= SymbolRef::SF_FormatSpecific;
if (MachOType & MachO::N_EXT) {
Result |= SymbolRef::SF_Global;
if ((MachOType & MachO::N_TYPE) == MachO::N_UNDF) {
if (getNValue(DRI))
Result |= SymbolRef::SF_Common;
else
Result |= SymbolRef::SF_Undefined;
}
if (!(MachOType & MachO::N_PEXT))
Result |= SymbolRef::SF_Exported;
}
if (MachOFlags & (MachO::N_WEAK_REF | MachO::N_WEAK_DEF))
Result |= SymbolRef::SF_Weak;
if (MachOFlags & (MachO::N_ARM_THUMB_DEF))
Result |= SymbolRef::SF_Thumb;
if ((MachOType & MachO::N_TYPE) == MachO::N_ABS)
Result |= SymbolRef::SF_Absolute;
return Result;
}
Expected<section_iterator>
MachOObjectFile::getSymbolSection(DataRefImpl Symb) const {
MachO::nlist_base Entry = getSymbolTableEntryBase(*this, Symb);
uint8_t index = Entry.n_sect;
if (index == 0)
return section_end();
DataRefImpl DRI;
DRI.d.a = index - 1;
if (DRI.d.a >= Sections.size()){
return malformedError("bad section index: " + Twine((int)index) +
" for symbol at index " + Twine(getSymbolIndex(Symb)));
}
return section_iterator(SectionRef(DRI, this));
}
unsigned MachOObjectFile::getSymbolSectionID(SymbolRef Sym) const {
MachO::nlist_base Entry =
getSymbolTableEntryBase(*this, Sym.getRawDataRefImpl());
return Entry.n_sect - 1;
}
void MachOObjectFile::moveSectionNext(DataRefImpl &Sec) const {
Sec.d.a++;
}
std::error_code MachOObjectFile::getSectionName(DataRefImpl Sec,
StringRef &Result) const {
ArrayRef<char> Raw = getSectionRawName(Sec);
Result = parseSegmentOrSectionName(Raw.data());
return std::error_code();
}
uint64_t MachOObjectFile::getSectionAddress(DataRefImpl Sec) const {
if (is64Bit())
return getSection64(Sec).addr;
return getSection(Sec).addr;
}
uint64_t MachOObjectFile::getSectionSize(DataRefImpl Sec) const {
// In the case if a malformed Mach-O file where the section offset is past
// the end of the file or some part of the section size is past the end of
// the file return a size of zero or a size that covers the rest of the file
// but does not extend past the end of the file.
uint32_t SectOffset, SectType;
uint64_t SectSize;
if (is64Bit()) {
MachO::section_64 Sect = getSection64(Sec);
SectOffset = Sect.offset;
SectSize = Sect.size;
SectType = Sect.flags & MachO::SECTION_TYPE;
} else {
MachO::section Sect = getSection(Sec);
SectOffset = Sect.offset;
SectSize = Sect.size;
SectType = Sect.flags & MachO::SECTION_TYPE;
}
if (SectType == MachO::S_ZEROFILL || SectType == MachO::S_GB_ZEROFILL)
return SectSize;
uint64_t FileSize = getData().size();
if (SectOffset > FileSize)
return 0;
if (FileSize - SectOffset < SectSize)
return FileSize - SectOffset;
return SectSize;
}
std::error_code MachOObjectFile::getSectionContents(DataRefImpl Sec,
StringRef &Res) const {
uint32_t Offset;
uint64_t Size;
if (is64Bit()) {
MachO::section_64 Sect = getSection64(Sec);
Offset = Sect.offset;
Size = Sect.size;
} else {
MachO::section Sect = getSection(Sec);
Offset = Sect.offset;
Size = Sect.size;
}
Res = this->getData().substr(Offset, Size);
return std::error_code();
}
uint64_t MachOObjectFile::getSectionAlignment(DataRefImpl Sec) const {
uint32_t Align;
if (is64Bit()) {
MachO::section_64 Sect = getSection64(Sec);
Align = Sect.align;
} else {
MachO::section Sect = getSection(Sec);
Align = Sect.align;
}
return uint64_t(1) << Align;
}
bool MachOObjectFile::isSectionCompressed(DataRefImpl Sec) const {
return false;
}
bool MachOObjectFile::isSectionText(DataRefImpl Sec) const {
uint32_t Flags = getSectionFlags(*this, Sec);
return Flags & MachO::S_ATTR_PURE_INSTRUCTIONS;
}
bool MachOObjectFile::isSectionData(DataRefImpl Sec) const {
uint32_t Flags = getSectionFlags(*this, Sec);
unsigned SectionType = Flags & MachO::SECTION_TYPE;
return !(Flags & MachO::S_ATTR_PURE_INSTRUCTIONS) &&
!(SectionType == MachO::S_ZEROFILL ||
SectionType == MachO::S_GB_ZEROFILL);
}
bool MachOObjectFile::isSectionBSS(DataRefImpl Sec) const {
uint32_t Flags = getSectionFlags(*this, Sec);
unsigned SectionType = Flags & MachO::SECTION_TYPE;
return !(Flags & MachO::S_ATTR_PURE_INSTRUCTIONS) &&
(SectionType == MachO::S_ZEROFILL ||
SectionType == MachO::S_GB_ZEROFILL);
}
unsigned MachOObjectFile::getSectionID(SectionRef Sec) const {
return Sec.getRawDataRefImpl().d.a;
}
bool MachOObjectFile::isSectionVirtual(DataRefImpl Sec) const {
// FIXME: Unimplemented.
return false;
}
bool MachOObjectFile::isSectionBitcode(DataRefImpl Sec) const {
StringRef SegmentName = getSectionFinalSegmentName(Sec);
StringRef SectName;
if (!getSectionName(Sec, SectName))
return (SegmentName == "__LLVM" && SectName == "__bitcode");
return false;
}
relocation_iterator MachOObjectFile::section_rel_begin(DataRefImpl Sec) const {
DataRefImpl Ret;
Ret.d.a = Sec.d.a;
Ret.d.b = 0;
return relocation_iterator(RelocationRef(Ret, this));
}
relocation_iterator
MachOObjectFile::section_rel_end(DataRefImpl Sec) const {
uint32_t Num;
if (is64Bit()) {
MachO::section_64 Sect = getSection64(Sec);
Num = Sect.nreloc;
} else {
MachO::section Sect = getSection(Sec);
Num = Sect.nreloc;
}
DataRefImpl Ret;
Ret.d.a = Sec.d.a;
Ret.d.b = Num;
return relocation_iterator(RelocationRef(Ret, this));
}
void MachOObjectFile::moveRelocationNext(DataRefImpl &Rel) const {
++Rel.d.b;
}
uint64_t MachOObjectFile::getRelocationOffset(DataRefImpl Rel) const {
assert(getHeader().filetype == MachO::MH_OBJECT &&
"Only implemented for MH_OBJECT");
MachO::any_relocation_info RE = getRelocation(Rel);
return getAnyRelocationAddress(RE);
}
symbol_iterator
MachOObjectFile::getRelocationSymbol(DataRefImpl Rel) const {
MachO::any_relocation_info RE = getRelocation(Rel);
if (isRelocationScattered(RE))
return symbol_end();
uint32_t SymbolIdx = getPlainRelocationSymbolNum(RE);
bool isExtern = getPlainRelocationExternal(RE);
if (!isExtern)
return symbol_end();
MachO::symtab_command S = getSymtabLoadCommand();
unsigned SymbolTableEntrySize = is64Bit() ?
sizeof(MachO::nlist_64) :
sizeof(MachO::nlist);
uint64_t Offset = S.symoff + SymbolIdx * SymbolTableEntrySize;
DataRefImpl Sym;
Sym.p = reinterpret_cast<uintptr_t>(getPtr(*this, Offset));
return symbol_iterator(SymbolRef(Sym, this));
}
section_iterator
MachOObjectFile::getRelocationSection(DataRefImpl Rel) const {
return section_iterator(getAnyRelocationSection(getRelocation(Rel)));
}
uint64_t MachOObjectFile::getRelocationType(DataRefImpl Rel) const {
MachO::any_relocation_info RE = getRelocation(Rel);
return getAnyRelocationType(RE);
}
void MachOObjectFile::getRelocationTypeName(
DataRefImpl Rel, SmallVectorImpl<char> &Result) const {
StringRef res;
uint64_t RType = getRelocationType(Rel);
unsigned Arch = this->getArch();
switch (Arch) {
case Triple::x86: {
static const char *const Table[] = {
"GENERIC_RELOC_VANILLA",
"GENERIC_RELOC_PAIR",
"GENERIC_RELOC_SECTDIFF",
"GENERIC_RELOC_PB_LA_PTR",
"GENERIC_RELOC_LOCAL_SECTDIFF",
"GENERIC_RELOC_TLV" };
if (RType > 5)
res = "Unknown";
else
res = Table[RType];
break;
}
case Triple::x86_64: {
static const char *const Table[] = {
"X86_64_RELOC_UNSIGNED",
"X86_64_RELOC_SIGNED",
"X86_64_RELOC_BRANCH",
"X86_64_RELOC_GOT_LOAD",
"X86_64_RELOC_GOT",
"X86_64_RELOC_SUBTRACTOR",
"X86_64_RELOC_SIGNED_1",
"X86_64_RELOC_SIGNED_2",
"X86_64_RELOC_SIGNED_4",
"X86_64_RELOC_TLV" };
if (RType > 9)
res = "Unknown";
else
res = Table[RType];
break;
}
case Triple::arm: {
static const char *const Table[] = {
"ARM_RELOC_VANILLA",
"ARM_RELOC_PAIR",
"ARM_RELOC_SECTDIFF",
"ARM_RELOC_LOCAL_SECTDIFF",
"ARM_RELOC_PB_LA_PTR",
"ARM_RELOC_BR24",
"ARM_THUMB_RELOC_BR22",
"ARM_THUMB_32BIT_BRANCH",
"ARM_RELOC_HALF",
"ARM_RELOC_HALF_SECTDIFF" };
if (RType > 9)
res = "Unknown";
else
res = Table[RType];
break;
}
case Triple::aarch64: {
static const char *const Table[] = {
"ARM64_RELOC_UNSIGNED", "ARM64_RELOC_SUBTRACTOR",
"ARM64_RELOC_BRANCH26", "ARM64_RELOC_PAGE21",
"ARM64_RELOC_PAGEOFF12", "ARM64_RELOC_GOT_LOAD_PAGE21",
"ARM64_RELOC_GOT_LOAD_PAGEOFF12", "ARM64_RELOC_POINTER_TO_GOT",
"ARM64_RELOC_TLVP_LOAD_PAGE21", "ARM64_RELOC_TLVP_LOAD_PAGEOFF12",
"ARM64_RELOC_ADDEND"
};
if (RType >= array_lengthof(Table))
res = "Unknown";
else
res = Table[RType];
break;
}
case Triple::ppc: {
static const char *const Table[] = {
"PPC_RELOC_VANILLA",
"PPC_RELOC_PAIR",
"PPC_RELOC_BR14",
"PPC_RELOC_BR24",
"PPC_RELOC_HI16",
"PPC_RELOC_LO16",
"PPC_RELOC_HA16",
"PPC_RELOC_LO14",
"PPC_RELOC_SECTDIFF",
"PPC_RELOC_PB_LA_PTR",
"PPC_RELOC_HI16_SECTDIFF",
"PPC_RELOC_LO16_SECTDIFF",
"PPC_RELOC_HA16_SECTDIFF",
"PPC_RELOC_JBSR",
"PPC_RELOC_LO14_SECTDIFF",
"PPC_RELOC_LOCAL_SECTDIFF" };
if (RType > 15)
res = "Unknown";
else
res = Table[RType];
break;
}
case Triple::UnknownArch:
res = "Unknown";
break;
}
Result.append(res.begin(), res.end());
}
uint8_t MachOObjectFile::getRelocationLength(DataRefImpl Rel) const {
MachO::any_relocation_info RE = getRelocation(Rel);
return getAnyRelocationLength(RE);
}
//
// guessLibraryShortName() is passed a name of a dynamic library and returns a
// guess on what the short name is. Then name is returned as a substring of the
// StringRef Name passed in. The name of the dynamic library is recognized as
// a framework if it has one of the two following forms:
// Foo.framework/Versions/A/Foo
// Foo.framework/Foo
// Where A and Foo can be any string. And may contain a trailing suffix
// starting with an underbar. If the Name is recognized as a framework then
// isFramework is set to true else it is set to false. If the Name has a
// suffix then Suffix is set to the substring in Name that contains the suffix
// else it is set to a NULL StringRef.
//
// The Name of the dynamic library is recognized as a library name if it has
// one of the two following forms:
// libFoo.A.dylib
// libFoo.dylib
// The library may have a suffix trailing the name Foo of the form:
// libFoo_profile.A.dylib
// libFoo_profile.dylib
//
// The Name of the dynamic library is also recognized as a library name if it
// has the following form:
// Foo.qtx
//
// If the Name of the dynamic library is none of the forms above then a NULL
// StringRef is returned.
//
StringRef MachOObjectFile::guessLibraryShortName(StringRef Name,
bool &isFramework,
StringRef &Suffix) {
StringRef Foo, F, DotFramework, V, Dylib, Lib, Dot, Qtx;
size_t a, b, c, d, Idx;
isFramework = false;
Suffix = StringRef();
// Pull off the last component and make Foo point to it
a = Name.rfind('/');
if (a == Name.npos || a == 0)
goto guess_library;
Foo = Name.slice(a+1, Name.npos);
// Look for a suffix starting with a '_'
Idx = Foo.rfind('_');
if (Idx != Foo.npos && Foo.size() >= 2) {
Suffix = Foo.slice(Idx, Foo.npos);
Foo = Foo.slice(0, Idx);
}
// First look for the form Foo.framework/Foo
b = Name.rfind('/', a);
if (b == Name.npos)
Idx = 0;
else
Idx = b+1;
F = Name.slice(Idx, Idx + Foo.size());
DotFramework = Name.slice(Idx + Foo.size(),
Idx + Foo.size() + sizeof(".framework/")-1);
if (F == Foo && DotFramework == ".framework/") {
isFramework = true;
return Foo;
}
// Next look for the form Foo.framework/Versions/A/Foo
if (b == Name.npos)
goto guess_library;
c = Name.rfind('/', b);
if (c == Name.npos || c == 0)
goto guess_library;
V = Name.slice(c+1, Name.npos);
if (!V.startswith("Versions/"))
goto guess_library;
d = Name.rfind('/', c);
if (d == Name.npos)
Idx = 0;
else
Idx = d+1;
F = Name.slice(Idx, Idx + Foo.size());
DotFramework = Name.slice(Idx + Foo.size(),
Idx + Foo.size() + sizeof(".framework/")-1);
if (F == Foo && DotFramework == ".framework/") {
isFramework = true;
return Foo;
}
guess_library:
// pull off the suffix after the "." and make a point to it
a = Name.rfind('.');
if (a == Name.npos || a == 0)
return StringRef();
Dylib = Name.slice(a, Name.npos);
if (Dylib != ".dylib")
goto guess_qtx;
// First pull off the version letter for the form Foo.A.dylib if any.
if (a >= 3) {
Dot = Name.slice(a-2, a-1);
if (Dot == ".")
a = a - 2;
}
b = Name.rfind('/', a);
if (b == Name.npos)
b = 0;
else
b = b+1;
// ignore any suffix after an underbar like Foo_profile.A.dylib
Idx = Name.find('_', b);
if (Idx != Name.npos && Idx != b) {
Lib = Name.slice(b, Idx);
Suffix = Name.slice(Idx, a);
}
else
Lib = Name.slice(b, a);
// There are incorrect library names of the form:
// libATS.A_profile.dylib so check for these.
if (Lib.size() >= 3) {
Dot = Lib.slice(Lib.size()-2, Lib.size()-1);
if (Dot == ".")
Lib = Lib.slice(0, Lib.size()-2);
}
return Lib;
guess_qtx:
Qtx = Name.slice(a, Name.npos);
if (Qtx != ".qtx")
return StringRef();
b = Name.rfind('/', a);
if (b == Name.npos)
Lib = Name.slice(0, a);
else
Lib = Name.slice(b+1, a);
// There are library names of the form: QT.A.qtx so check for these.
if (Lib.size() >= 3) {
Dot = Lib.slice(Lib.size()-2, Lib.size()-1);
if (Dot == ".")
Lib = Lib.slice(0, Lib.size()-2);
}
return Lib;
}
// getLibraryShortNameByIndex() is used to get the short name of the library
// for an undefined symbol in a linked Mach-O binary that was linked with the
// normal two-level namespace default (that is MH_TWOLEVEL in the header).
// It is passed the index (0 - based) of the library as translated from
// GET_LIBRARY_ORDINAL (1 - based).
std::error_code MachOObjectFile::getLibraryShortNameByIndex(unsigned Index,
StringRef &Res) const {
if (Index >= Libraries.size())
return object_error::parse_failed;
// If the cache of LibrariesShortNames is not built up do that first for
// all the Libraries.
if (LibrariesShortNames.size() == 0) {
for (unsigned i = 0; i < Libraries.size(); i++) {
MachO::dylib_command D =
getStruct<MachO::dylib_command>(*this, Libraries[i]);
if (D.dylib.name >= D.cmdsize)
return object_error::parse_failed;
const char *P = (const char *)(Libraries[i]) + D.dylib.name;
StringRef Name = StringRef(P);
if (D.dylib.name+Name.size() >= D.cmdsize)
return object_error::parse_failed;
StringRef Suffix;
bool isFramework;
StringRef shortName = guessLibraryShortName(Name, isFramework, Suffix);
if (shortName.empty())
LibrariesShortNames.push_back(Name);
else
LibrariesShortNames.push_back(shortName);
}
}
Res = LibrariesShortNames[Index];
return std::error_code();
}
uint32_t MachOObjectFile::getLibraryCount() const {
return Libraries.size();
}
section_iterator
MachOObjectFile::getRelocationRelocatedSection(relocation_iterator Rel) const {
DataRefImpl Sec;
Sec.d.a = Rel->getRawDataRefImpl().d.a;
return section_iterator(SectionRef(Sec, this));
}
basic_symbol_iterator MachOObjectFile::symbol_begin() const {
DataRefImpl DRI;
MachO::symtab_command Symtab = getSymtabLoadCommand();
if (!SymtabLoadCmd || Symtab.nsyms == 0)
return basic_symbol_iterator(SymbolRef(DRI, this));
return getSymbolByIndex(0);
}
basic_symbol_iterator MachOObjectFile::symbol_end() const {
DataRefImpl DRI;
MachO::symtab_command Symtab = getSymtabLoadCommand();
if (!SymtabLoadCmd || Symtab.nsyms == 0)
return basic_symbol_iterator(SymbolRef(DRI, this));
unsigned SymbolTableEntrySize = is64Bit() ?
sizeof(MachO::nlist_64) :
sizeof(MachO::nlist);
unsigned Offset = Symtab.symoff +
Symtab.nsyms * SymbolTableEntrySize;
DRI.p = reinterpret_cast<uintptr_t>(getPtr(*this, Offset));
return basic_symbol_iterator(SymbolRef(DRI, this));
}
basic_symbol_iterator MachOObjectFile::getSymbolByIndex(unsigned Index) const {
MachO::symtab_command Symtab = getSymtabLoadCommand();
if (!SymtabLoadCmd || Index >= Symtab.nsyms)
report_fatal_error("Requested symbol index is out of range.");
unsigned SymbolTableEntrySize =
is64Bit() ? sizeof(MachO::nlist_64) : sizeof(MachO::nlist);
DataRefImpl DRI;
DRI.p = reinterpret_cast<uintptr_t>(getPtr(*this, Symtab.symoff));
DRI.p += Index * SymbolTableEntrySize;
return basic_symbol_iterator(SymbolRef(DRI, this));
}
uint64_t MachOObjectFile::getSymbolIndex(DataRefImpl Symb) const {
MachO::symtab_command Symtab = getSymtabLoadCommand();
if (!SymtabLoadCmd)
report_fatal_error("getSymbolIndex() called with no symbol table symbol");
unsigned SymbolTableEntrySize =
is64Bit() ? sizeof(MachO::nlist_64) : sizeof(MachO::nlist);
DataRefImpl DRIstart;
DRIstart.p = reinterpret_cast<uintptr_t>(getPtr(*this, Symtab.symoff));
uint64_t Index = (Symb.p - DRIstart.p) / SymbolTableEntrySize;
return Index;
}
section_iterator MachOObjectFile::section_begin() const {
DataRefImpl DRI;
return section_iterator(SectionRef(DRI, this));
}
section_iterator MachOObjectFile::section_end() const {
DataRefImpl DRI;
DRI.d.a = Sections.size();
return section_iterator(SectionRef(DRI, this));
}
uint8_t MachOObjectFile::getBytesInAddress() const {
return is64Bit() ? 8 : 4;
}
StringRef MachOObjectFile::getFileFormatName() const {
unsigned CPUType = getCPUType(*this);
if (!is64Bit()) {
switch (CPUType) {
case MachO::CPU_TYPE_I386:
return "Mach-O 32-bit i386";
case MachO::CPU_TYPE_ARM:
return "Mach-O arm";
case MachO::CPU_TYPE_POWERPC:
return "Mach-O 32-bit ppc";
default:
return "Mach-O 32-bit unknown";
}
}
switch (CPUType) {
case MachO::CPU_TYPE_X86_64:
return "Mach-O 64-bit x86-64";
case MachO::CPU_TYPE_ARM64:
return "Mach-O arm64";
case MachO::CPU_TYPE_POWERPC64:
return "Mach-O 64-bit ppc64";
default:
return "Mach-O 64-bit unknown";
}
}
Triple::ArchType MachOObjectFile::getArch(uint32_t CPUType) {
switch (CPUType) {
case MachO::CPU_TYPE_I386:
return Triple::x86;
case MachO::CPU_TYPE_X86_64:
return Triple::x86_64;
case MachO::CPU_TYPE_ARM:
return Triple::arm;
case MachO::CPU_TYPE_ARM64:
return Triple::aarch64;
case MachO::CPU_TYPE_POWERPC:
return Triple::ppc;
case MachO::CPU_TYPE_POWERPC64:
return Triple::ppc64;
default:
return Triple::UnknownArch;
}
}
Triple MachOObjectFile::getArchTriple(uint32_t CPUType, uint32_t CPUSubType,
const char **McpuDefault,
const char **ArchFlag) {
if (McpuDefault)
*McpuDefault = nullptr;
if (ArchFlag)
*ArchFlag = nullptr;
switch (CPUType) {
case MachO::CPU_TYPE_I386:
switch (CPUSubType & ~MachO::CPU_SUBTYPE_MASK) {
case MachO::CPU_SUBTYPE_I386_ALL:
if (ArchFlag)
*ArchFlag = "i386";
return Triple("i386-apple-darwin");
default:
return Triple();
}
case MachO::CPU_TYPE_X86_64:
switch (CPUSubType & ~MachO::CPU_SUBTYPE_MASK) {
case MachO::CPU_SUBTYPE_X86_64_ALL:
if (ArchFlag)
*ArchFlag = "x86_64";
return Triple("x86_64-apple-darwin");
case MachO::CPU_SUBTYPE_X86_64_H:
if (ArchFlag)
*ArchFlag = "x86_64h";
return Triple("x86_64h-apple-darwin");
default:
return Triple();
}
case MachO::CPU_TYPE_ARM:
switch (CPUSubType & ~MachO::CPU_SUBTYPE_MASK) {
case MachO::CPU_SUBTYPE_ARM_V4T:
if (ArchFlag)
*ArchFlag = "armv4t";
return Triple("armv4t-apple-darwin");
case MachO::CPU_SUBTYPE_ARM_V5TEJ:
if (ArchFlag)
*ArchFlag = "armv5e";
return Triple("armv5e-apple-darwin");
case MachO::CPU_SUBTYPE_ARM_XSCALE:
if (ArchFlag)
*ArchFlag = "xscale";
return Triple("xscale-apple-darwin");
case MachO::CPU_SUBTYPE_ARM_V6:
if (ArchFlag)
*ArchFlag = "armv6";
return Triple("armv6-apple-darwin");
case MachO::CPU_SUBTYPE_ARM_V6M:
if (McpuDefault)
*McpuDefault = "cortex-m0";
if (ArchFlag)
*ArchFlag = "armv6m";
return Triple("armv6m-apple-darwin");
case MachO::CPU_SUBTYPE_ARM_V7:
if (ArchFlag)
*ArchFlag = "armv7";
return Triple("armv7-apple-darwin");
case MachO::CPU_SUBTYPE_ARM_V7EM:
if (McpuDefault)
*McpuDefault = "cortex-m4";
if (ArchFlag)
*ArchFlag = "armv7em";
return Triple("thumbv7em-apple-darwin");
case MachO::CPU_SUBTYPE_ARM_V7K:
if (McpuDefault)
*McpuDefault = "cortex-a7";
if (ArchFlag)
*ArchFlag = "armv7k";
return Triple("armv7k-apple-darwin");
case MachO::CPU_SUBTYPE_ARM_V7M:
if (McpuDefault)
*McpuDefault = "cortex-m3";
if (ArchFlag)
*ArchFlag = "armv7m";
return Triple("thumbv7m-apple-darwin");
case MachO::CPU_SUBTYPE_ARM_V7S:
if (McpuDefault)
*McpuDefault = "cortex-a7";
if (ArchFlag)
*ArchFlag = "armv7s";
return Triple("armv7s-apple-darwin");
default:
return Triple();
}
case MachO::CPU_TYPE_ARM64:
switch (CPUSubType & ~MachO::CPU_SUBTYPE_MASK) {
case MachO::CPU_SUBTYPE_ARM64_ALL:
if (McpuDefault)
*McpuDefault = "cyclone";
if (ArchFlag)
*ArchFlag = "arm64";
return Triple("arm64-apple-darwin");
default:
return Triple();
}
case MachO::CPU_TYPE_POWERPC:
switch (CPUSubType & ~MachO::CPU_SUBTYPE_MASK) {
case MachO::CPU_SUBTYPE_POWERPC_ALL:
if (ArchFlag)
*ArchFlag = "ppc";
return Triple("ppc-apple-darwin");
default:
return Triple();
}
case MachO::CPU_TYPE_POWERPC64:
switch (CPUSubType & ~MachO::CPU_SUBTYPE_MASK) {
case MachO::CPU_SUBTYPE_POWERPC_ALL:
if (ArchFlag)
*ArchFlag = "ppc64";
return Triple("ppc64-apple-darwin");
default:
return Triple();
}
default:
return Triple();
}
}
Triple MachOObjectFile::getHostArch() {
return Triple(sys::getDefaultTargetTriple());
}
bool MachOObjectFile::isValidArch(StringRef ArchFlag) {
return StringSwitch<bool>(ArchFlag)
.Case("i386", true)
.Case("x86_64", true)
.Case("x86_64h", true)
.Case("armv4t", true)
.Case("arm", true)
.Case("armv5e", true)
.Case("armv6", true)
.Case("armv6m", true)
.Case("armv7", true)
.Case("armv7em", true)
.Case("armv7k", true)
.Case("armv7m", true)
.Case("armv7s", true)
.Case("arm64", true)
.Case("ppc", true)
.Case("ppc64", true)
.Default(false);
}
unsigned MachOObjectFile::getArch() const {
return getArch(getCPUType(*this));
}
Triple MachOObjectFile::getArchTriple(const char **McpuDefault) const {
return getArchTriple(Header.cputype, Header.cpusubtype, McpuDefault);
}
relocation_iterator MachOObjectFile::section_rel_begin(unsigned Index) const {
DataRefImpl DRI;
DRI.d.a = Index;
return section_rel_begin(DRI);
}
relocation_iterator MachOObjectFile::section_rel_end(unsigned Index) const {
DataRefImpl DRI;
DRI.d.a = Index;
return section_rel_end(DRI);
}
dice_iterator MachOObjectFile::begin_dices() const {
DataRefImpl DRI;
if (!DataInCodeLoadCmd)
return dice_iterator(DiceRef(DRI, this));
MachO::linkedit_data_command DicLC = getDataInCodeLoadCommand();
DRI.p = reinterpret_cast<uintptr_t>(getPtr(*this, DicLC.dataoff));
return dice_iterator(DiceRef(DRI, this));
}
dice_iterator MachOObjectFile::end_dices() const {
DataRefImpl DRI;
if (!DataInCodeLoadCmd)
return dice_iterator(DiceRef(DRI, this));
MachO::linkedit_data_command DicLC = getDataInCodeLoadCommand();
unsigned Offset = DicLC.dataoff + DicLC.datasize;
DRI.p = reinterpret_cast<uintptr_t>(getPtr(*this, Offset));
return dice_iterator(DiceRef(DRI, this));
}
ExportEntry::ExportEntry(ArrayRef<uint8_t> T) : Trie(T) {}
void ExportEntry::moveToFirst() {
pushNode(0);
pushDownUntilBottom();
}
void ExportEntry::moveToEnd() {
Stack.clear();
Done = true;
}
bool ExportEntry::operator==(const ExportEntry &Other) const {
// Common case, one at end, other iterating from begin.
if (Done || Other.Done)
return (Done == Other.Done);
// Not equal if different stack sizes.
if (Stack.size() != Other.Stack.size())
return false;
// Not equal if different cumulative strings.
if (!CumulativeString.equals(Other.CumulativeString))
return false;
// Equal if all nodes in both stacks match.
for (unsigned i=0; i < Stack.size(); ++i) {
if (Stack[i].Start != Other.Stack[i].Start)
return false;
}
return true;
}
uint64_t ExportEntry::readULEB128(const uint8_t *&Ptr) {
unsigned Count;
uint64_t Result = decodeULEB128(Ptr, &Count);
Ptr += Count;
if (Ptr > Trie.end()) {
Ptr = Trie.end();
Malformed = true;
}
return Result;
}
StringRef ExportEntry::name() const {
return CumulativeString;
}
uint64_t ExportEntry::flags() const {
return Stack.back().Flags;
}
uint64_t ExportEntry::address() const {
return Stack.back().Address;
}
uint64_t ExportEntry::other() const {
return Stack.back().Other;
}
StringRef ExportEntry::otherName() const {
const char* ImportName = Stack.back().ImportName;
if (ImportName)
return StringRef(ImportName);
return StringRef();
}
uint32_t ExportEntry::nodeOffset() const {
return Stack.back().Start - Trie.begin();
}
ExportEntry::NodeState::NodeState(const uint8_t *Ptr)
: Start(Ptr), Current(Ptr) {}
void ExportEntry::pushNode(uint64_t offset) {
const uint8_t *Ptr = Trie.begin() + offset;
NodeState State(Ptr);
uint64_t ExportInfoSize = readULEB128(State.Current);
State.IsExportNode = (ExportInfoSize != 0);
const uint8_t* Children = State.Current + ExportInfoSize;
if (State.IsExportNode) {
State.Flags = readULEB128(State.Current);
if (State.Flags & MachO::EXPORT_SYMBOL_FLAGS_REEXPORT) {
State.Address = 0;
State.Other = readULEB128(State.Current); // dylib ordinal
State.ImportName = reinterpret_cast<const char*>(State.Current);
} else {
State.Address = readULEB128(State.Current);
if (State.Flags & MachO::EXPORT_SYMBOL_FLAGS_STUB_AND_RESOLVER)
State.Other = readULEB128(State.Current);
}
}
State.ChildCount = *Children;
State.Current = Children + 1;
State.NextChildIndex = 0;
State.ParentStringLength = CumulativeString.size();
Stack.push_back(State);
}
void ExportEntry::pushDownUntilBottom() {
while (Stack.back().NextChildIndex < Stack.back().ChildCount) {
NodeState &Top = Stack.back();
CumulativeString.resize(Top.ParentStringLength);
for (;*Top.Current != 0; Top.Current++) {
char C = *Top.Current;
CumulativeString.push_back(C);
}
Top.Current += 1;
uint64_t childNodeIndex = readULEB128(Top.Current);
Top.NextChildIndex += 1;
pushNode(childNodeIndex);
}
if (!Stack.back().IsExportNode) {
Malformed = true;
moveToEnd();
}
}
// We have a trie data structure and need a way to walk it that is compatible
// with the C++ iterator model. The solution is a non-recursive depth first
// traversal where the iterator contains a stack of parent nodes along with a
// string that is the accumulation of all edge strings along the parent chain
// to this point.
//
// There is one "export" node for each exported symbol. But because some
// symbols may be a prefix of another symbol (e.g. _dup and _dup2), an export
// node may have child nodes too.
//
// The algorithm for moveNext() is to keep moving down the leftmost unvisited
// child until hitting a node with no children (which is an export node or
// else the trie is malformed). On the way down, each node is pushed on the
// stack ivar. If there is no more ways down, it pops up one and tries to go
// down a sibling path until a childless node is reached.
void ExportEntry::moveNext() {
if (Stack.empty() || !Stack.back().IsExportNode) {
Malformed = true;
moveToEnd();
return;
}
Stack.pop_back();
while (!Stack.empty()) {
NodeState &Top = Stack.back();
if (Top.NextChildIndex < Top.ChildCount) {
pushDownUntilBottom();
// Now at the next export node.
return;
} else {
if (Top.IsExportNode) {
// This node has no children but is itself an export node.
CumulativeString.resize(Top.ParentStringLength);
return;
}
Stack.pop_back();
}
}
Done = true;
}
iterator_range<export_iterator>
MachOObjectFile::exports(ArrayRef<uint8_t> Trie) {
ExportEntry Start(Trie);
if (Trie.empty())
Start.moveToEnd();
else
Start.moveToFirst();
ExportEntry Finish(Trie);
Finish.moveToEnd();
return make_range(export_iterator(Start), export_iterator(Finish));
}
iterator_range<export_iterator> MachOObjectFile::exports() const {
return exports(getDyldInfoExportsTrie());
}
MachORebaseEntry::MachORebaseEntry(Error *E, const MachOObjectFile *O,
ArrayRef<uint8_t> Bytes, bool is64Bit)
: E(E), O(O), Opcodes(Bytes), Ptr(Bytes.begin()),
PointerSize(is64Bit ? 8 : 4) {}
void MachORebaseEntry::moveToFirst() {
Ptr = Opcodes.begin();
moveNext();
}
void MachORebaseEntry::moveToEnd() {
Ptr = Opcodes.end();
RemainingLoopCount = 0;
Done = true;
}
void MachORebaseEntry::moveNext() {
ErrorAsOutParameter ErrAsOutParam(E);
// If in the middle of some loop, move to next rebasing in loop.
SegmentOffset += AdvanceAmount;
if (RemainingLoopCount) {
--RemainingLoopCount;
return;
}
// REBASE_OPCODE_DONE is only used for padding if we are not aligned to
// pointer size. Therefore it is possible to reach the end without ever having
// seen REBASE_OPCODE_DONE.
if (Ptr == Opcodes.end()) {
Done = true;
return;
}
bool More = true;
while (More) {
// Parse next opcode and set up next loop.
const uint8_t *OpcodeStart = Ptr;
uint8_t Byte = *Ptr++;
uint8_t ImmValue = Byte & MachO::REBASE_IMMEDIATE_MASK;
uint8_t Opcode = Byte & MachO::REBASE_OPCODE_MASK;
uint32_t Count, Skip;
const char *error = nullptr;
switch (Opcode) {
case MachO::REBASE_OPCODE_DONE:
More = false;
Done = true;
moveToEnd();
DEBUG_WITH_TYPE("mach-o-rebase", dbgs() << "REBASE_OPCODE_DONE\n");
break;
case MachO::REBASE_OPCODE_SET_TYPE_IMM:
RebaseType = ImmValue;
if (RebaseType > MachO::REBASE_TYPE_TEXT_PCREL32) {
*E = malformedError("for REBASE_OPCODE_SET_TYPE_IMM bad bind type: " +
Twine((int)RebaseType) + " for opcode at: 0x" +
utohexstr(OpcodeStart - Opcodes.begin()));
moveToEnd();
return;
}
DEBUG_WITH_TYPE(
"mach-o-rebase",
dbgs() << "REBASE_OPCODE_SET_TYPE_IMM: "
<< "RebaseType=" << (int) RebaseType << "\n");
break;
case MachO::REBASE_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB:
SegmentIndex = ImmValue;
SegmentOffset = readULEB128(&error);
if (error) {
*E = malformedError("for REBASE_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB " +
Twine(error) + " for opcode at: 0x" +
utohexstr(OpcodeStart - Opcodes.begin()));
moveToEnd();
return;
}
error = O->RebaseEntryCheckSegAndOffset(SegmentIndex, SegmentOffset,
true);
if (error) {
*E = malformedError("for REBASE_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB " +
Twine(error) + " for opcode at: 0x" +
utohexstr(OpcodeStart - Opcodes.begin()));
moveToEnd();
return;
}
DEBUG_WITH_TYPE(
"mach-o-rebase",
dbgs() << "REBASE_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB: "
<< "SegmentIndex=" << SegmentIndex << ", "
<< format("SegmentOffset=0x%06X", SegmentOffset)
<< "\n");
break;
case MachO::REBASE_OPCODE_ADD_ADDR_ULEB:
SegmentOffset += readULEB128(&error);
if (error) {
*E = malformedError("for REBASE_OPCODE_ADD_ADDR_ULEB " +
Twine(error) + " for opcode at: 0x" +
utohexstr(OpcodeStart - Opcodes.begin()));
moveToEnd();
return;
}
error = O->RebaseEntryCheckSegAndOffset(SegmentIndex, SegmentOffset,
true);
if (error) {
*E = malformedError("for REBASE_OPCODE_ADD_ADDR_ULEB " +
Twine(error) + " for opcode at: 0x" +
utohexstr(OpcodeStart - Opcodes.begin()));
moveToEnd();
return;
}
DEBUG_WITH_TYPE("mach-o-rebase",
dbgs() << "REBASE_OPCODE_ADD_ADDR_ULEB: "
<< format("SegmentOffset=0x%06X",
SegmentOffset) << "\n");
break;
case MachO::REBASE_OPCODE_ADD_ADDR_IMM_SCALED:
error = O->RebaseEntryCheckSegAndOffset(SegmentIndex, SegmentOffset,
true);
if (error) {
*E = malformedError("for REBASE_OPCODE_ADD_ADDR_IMM_SCALED " +
Twine(error) + " for opcode at: 0x" +
utohexstr(OpcodeStart - Opcodes.begin()));
moveToEnd();
return;
}
SegmentOffset += ImmValue * PointerSize;
error = O->RebaseEntryCheckSegAndOffset(SegmentIndex, SegmentOffset,
false);
if (error) {
*E = malformedError("for REBASE_OPCODE_ADD_ADDR_IMM_SCALED "
" (after adding immediate times the pointer size) " +
Twine(error) + " for opcode at: 0x" +
utohexstr(OpcodeStart - Opcodes.begin()));
moveToEnd();
return;
}
DEBUG_WITH_TYPE("mach-o-rebase",
dbgs() << "REBASE_OPCODE_ADD_ADDR_IMM_SCALED: "
<< format("SegmentOffset=0x%06X",
SegmentOffset) << "\n");
break;
case MachO::REBASE_OPCODE_DO_REBASE_IMM_TIMES:
error = O->RebaseEntryCheckSegAndOffset(SegmentIndex, SegmentOffset,
true);
if (error) {
*E = malformedError("for REBASE_OPCODE_DO_REBASE_IMM_TIMES " +
Twine(error) + " for opcode at: 0x" +
utohexstr(OpcodeStart - Opcodes.begin()));
moveToEnd();
return;
}
AdvanceAmount = PointerSize;
Skip = 0;
Count = ImmValue;
if (ImmValue != 0)
RemainingLoopCount = ImmValue - 1;
else
RemainingLoopCount = 0;
error = O->RebaseEntryCheckCountAndSkip(Count, Skip, PointerSize,
SegmentIndex, SegmentOffset);
if (error) {
*E = malformedError("for REBASE_OPCODE_DO_REBASE_IMM_TIMES "
+ Twine(error) + " for opcode at: 0x" +
utohexstr(OpcodeStart - Opcodes.begin()));
moveToEnd();
return;
}
DEBUG_WITH_TYPE(
"mach-o-rebase",
dbgs() << "REBASE_OPCODE_DO_REBASE_IMM_TIMES: "
<< format("SegmentOffset=0x%06X", SegmentOffset)
<< ", AdvanceAmount=" << AdvanceAmount
<< ", RemainingLoopCount=" << RemainingLoopCount
<< "\n");
return;
case MachO::REBASE_OPCODE_DO_REBASE_ULEB_TIMES:
error = O->RebaseEntryCheckSegAndOffset(SegmentIndex, SegmentOffset,
true);
if (error) {
*E = malformedError("for REBASE_OPCODE_DO_REBASE_ULEB_TIMES " +
Twine(error) + " for opcode at: 0x" +
utohexstr(OpcodeStart - Opcodes.begin()));
moveToEnd();
return;
}
AdvanceAmount = PointerSize;
Skip = 0;
Count = readULEB128(&error);
if (error) {
*E = malformedError("for REBASE_OPCODE_DO_REBASE_ULEB_TIMES " +
Twine(error) + " for opcode at: 0x" +
utohexstr(OpcodeStart - Opcodes.begin()));
moveToEnd();
return;
}
if (Count != 0)
RemainingLoopCount = Count - 1;
else
RemainingLoopCount = 0;
error = O->RebaseEntryCheckCountAndSkip(Count, Skip, PointerSize,
SegmentIndex, SegmentOffset);
if (error) {
*E = malformedError("for REBASE_OPCODE_DO_REBASE_ULEB_TIMES "
+ Twine(error) + " for opcode at: 0x" +
utohexstr(OpcodeStart - Opcodes.begin()));
moveToEnd();
return;
}
DEBUG_WITH_TYPE(
"mach-o-rebase",
dbgs() << "REBASE_OPCODE_DO_REBASE_ULEB_TIMES: "
<< format("SegmentOffset=0x%06X", SegmentOffset)
<< ", AdvanceAmount=" << AdvanceAmount
<< ", RemainingLoopCount=" << RemainingLoopCount
<< "\n");
return;
case MachO::REBASE_OPCODE_DO_REBASE_ADD_ADDR_ULEB:
error = O->RebaseEntryCheckSegAndOffset(SegmentIndex, SegmentOffset,
true);
if (error) {
*E = malformedError("for REBASE_OPCODE_DO_REBASE_ADD_ADDR_ULEB " +
Twine(error) + " for opcode at: 0x" +
utohexstr(OpcodeStart - Opcodes.begin()));
moveToEnd();
return;
}
Skip = readULEB128(&error);
if (error) {
*E = malformedError("for REBASE_OPCODE_DO_REBASE_ADD_ADDR_ULEB " +
Twine(error) + " for opcode at: 0x" +
utohexstr(OpcodeStart - Opcodes.begin()));
moveToEnd();
return;
}
AdvanceAmount = Skip + PointerSize;
Count = 1;
RemainingLoopCount = 0;
error = O->RebaseEntryCheckCountAndSkip(Count, Skip, PointerSize,
SegmentIndex, SegmentOffset);
if (error) {
*E = malformedError("for REBASE_OPCODE_DO_REBASE_ADD_ADDR_ULEB "
+ Twine(error) + " for opcode at: 0x" +
utohexstr(OpcodeStart - Opcodes.begin()));
moveToEnd();
return;
}
DEBUG_WITH_TYPE(
"mach-o-rebase",
dbgs() << "REBASE_OPCODE_DO_REBASE_ADD_ADDR_ULEB: "
<< format("SegmentOffset=0x%06X", SegmentOffset)
<< ", AdvanceAmount=" << AdvanceAmount
<< ", RemainingLoopCount=" << RemainingLoopCount
<< "\n");
return;
case MachO::REBASE_OPCODE_DO_REBASE_ULEB_TIMES_SKIPPING_ULEB:
error = O->RebaseEntryCheckSegAndOffset(SegmentIndex, SegmentOffset,
true);
if (error) {
*E = malformedError("for REBASE_OPCODE_DO_REBASE_ULEB_TIMES_SKIPPING_"
"ULEB " + Twine(error) + " for opcode at: 0x" +
utohexstr(OpcodeStart - Opcodes.begin()));
moveToEnd();
return;
}
Count = readULEB128(&error);
if (error) {
*E = malformedError("for REBASE_OPCODE_DO_REBASE_ULEB_TIMES_SKIPPING_"
"ULEB " + Twine(error) + " for opcode at: 0x" +
utohexstr(OpcodeStart - Opcodes.begin()));
moveToEnd();
return;
}
if (Count != 0)
RemainingLoopCount = Count - 1;
else
RemainingLoopCount = 0;
Skip = readULEB128(&error);
if (error) {
*E = malformedError("for REBASE_OPCODE_DO_REBASE_ULEB_TIMES_SKIPPING_"
"ULEB " + Twine(error) + " for opcode at: 0x" +
utohexstr(OpcodeStart - Opcodes.begin()));
moveToEnd();
return;
}
AdvanceAmount = Skip + PointerSize;
error = O->RebaseEntryCheckCountAndSkip(Count, Skip, PointerSize,
SegmentIndex, SegmentOffset);
if (error) {
*E = malformedError("for REBASE_OPCODE_DO_REBASE_ULEB_TIMES_SKIPPING_"
"ULEB " + Twine(error) + " for opcode at: 0x" +
utohexstr(OpcodeStart - Opcodes.begin()));
moveToEnd();
return;
}
DEBUG_WITH_TYPE(
"mach-o-rebase",
dbgs() << "REBASE_OPCODE_DO_REBASE_ULEB_TIMES_SKIPPING_ULEB: "
<< format("SegmentOffset=0x%06X", SegmentOffset)
<< ", AdvanceAmount=" << AdvanceAmount
<< ", RemainingLoopCount=" << RemainingLoopCount
<< "\n");
return;
default:
*E = malformedError("bad rebase info (bad opcode value 0x" +
utohexstr(Opcode) + " for opcode at: 0x" +
utohexstr(OpcodeStart - Opcodes.begin()));
moveToEnd();
return;
}
}
}
uint64_t MachORebaseEntry::readULEB128(const char **error) {
unsigned Count;
uint64_t Result = decodeULEB128(Ptr, &Count, Opcodes.end(), error);
Ptr += Count;
if (Ptr > Opcodes.end())
Ptr = Opcodes.end();
return Result;
}
int32_t MachORebaseEntry::segmentIndex() const { return SegmentIndex; }
uint64_t MachORebaseEntry::segmentOffset() const { return SegmentOffset; }
StringRef MachORebaseEntry::typeName() const {
switch (RebaseType) {
case MachO::REBASE_TYPE_POINTER:
return "pointer";
case MachO::REBASE_TYPE_TEXT_ABSOLUTE32:
return "text abs32";
case MachO::REBASE_TYPE_TEXT_PCREL32:
return "text rel32";
}
return "unknown";
}
// For use with the SegIndex of a checked Mach-O Rebase entry
// to get the segment name.
StringRef MachORebaseEntry::segmentName() const {
return O->BindRebaseSegmentName(SegmentIndex);
}
// For use with a SegIndex,SegOffset pair from a checked Mach-O Rebase entry
// to get the section name.
StringRef MachORebaseEntry::sectionName() const {
return O->BindRebaseSectionName(SegmentIndex, SegmentOffset);
}
// For use with a SegIndex,SegOffset pair from a checked Mach-O Rebase entry
// to get the address.
uint64_t MachORebaseEntry::address() const {
return O->BindRebaseAddress(SegmentIndex, SegmentOffset);
}
bool MachORebaseEntry::operator==(const MachORebaseEntry &Other) const {
#ifdef EXPENSIVE_CHECKS
assert(Opcodes == Other.Opcodes && "compare iterators of different files");
#else
assert(Opcodes.data() == Other.Opcodes.data() && "compare iterators of different files");
#endif
return (Ptr == Other.Ptr) &&
(RemainingLoopCount == Other.RemainingLoopCount) &&
(Done == Other.Done);
}
iterator_range<rebase_iterator>
MachOObjectFile::rebaseTable(Error &Err, MachOObjectFile *O,
ArrayRef<uint8_t> Opcodes, bool is64) {
if (O->BindRebaseSectionTable == nullptr)
O->BindRebaseSectionTable = llvm::make_unique<BindRebaseSegInfo>(O);
MachORebaseEntry Start(&Err, O, Opcodes, is64);
Start.moveToFirst();
MachORebaseEntry Finish(&Err, O, Opcodes, is64);
Finish.moveToEnd();
return make_range(rebase_iterator(Start), rebase_iterator(Finish));
}
iterator_range<rebase_iterator> MachOObjectFile::rebaseTable(Error &Err) {
return rebaseTable(Err, this, getDyldInfoRebaseOpcodes(), is64Bit());
}
MachOBindEntry::MachOBindEntry(Error *E, const MachOObjectFile *O,
ArrayRef<uint8_t> Bytes, bool is64Bit, Kind BK)
: E(E), O(O), Opcodes(Bytes), Ptr(Bytes.begin()),
PointerSize(is64Bit ? 8 : 4), TableKind(BK) {}
void MachOBindEntry::moveToFirst() {
Ptr = Opcodes.begin();
moveNext();
}
void MachOBindEntry::moveToEnd() {
Ptr = Opcodes.end();
RemainingLoopCount = 0;
Done = true;
}
void MachOBindEntry::moveNext() {
ErrorAsOutParameter ErrAsOutParam(E);
// If in the middle of some loop, move to next binding in loop.
SegmentOffset += AdvanceAmount;
if (RemainingLoopCount) {
--RemainingLoopCount;
return;
}
// BIND_OPCODE_DONE is only used for padding if we are not aligned to
// pointer size. Therefore it is possible to reach the end without ever having
// seen BIND_OPCODE_DONE.
if (Ptr == Opcodes.end()) {
Done = true;
return;
}
bool More = true;
while (More) {
// Parse next opcode and set up next loop.
const uint8_t *OpcodeStart = Ptr;
uint8_t Byte = *Ptr++;
uint8_t ImmValue = Byte & MachO::BIND_IMMEDIATE_MASK;
uint8_t Opcode = Byte & MachO::BIND_OPCODE_MASK;
int8_t SignExtended;
const uint8_t *SymStart;
uint32_t Count, Skip;
const char *error = nullptr;
switch (Opcode) {
case MachO::BIND_OPCODE_DONE:
if (TableKind == Kind::Lazy) {
// Lazying bindings have a DONE opcode between entries. Need to ignore
// it to advance to next entry. But need not if this is last entry.
bool NotLastEntry = false;
for (const uint8_t *P = Ptr; P < Opcodes.end(); ++P) {
if (*P) {
NotLastEntry = true;
}
}
if (NotLastEntry)
break;
}
More = false;
moveToEnd();
DEBUG_WITH_TYPE("mach-o-bind", dbgs() << "BIND_OPCODE_DONE\n");
break;
case MachO::BIND_OPCODE_SET_DYLIB_ORDINAL_IMM:
if (TableKind == Kind::Weak) {
*E = malformedError("BIND_OPCODE_SET_DYLIB_ORDINAL_IMM not allowed in "
"weak bind table for opcode at: 0x" +
utohexstr(OpcodeStart - Opcodes.begin()));
moveToEnd();
return;
}
Ordinal = ImmValue;
LibraryOrdinalSet = true;
if (ImmValue > O->getLibraryCount()) {
*E = malformedError("for BIND_OPCODE_SET_DYLIB_ORDINAL_ULEB bad "
"library ordinal: " + Twine((int)ImmValue) + " (max " +
Twine((int)O->getLibraryCount()) + ") for opcode at: 0x" +
utohexstr(OpcodeStart - Opcodes.begin()));
moveToEnd();
return;
}
DEBUG_WITH_TYPE(
"mach-o-bind",
dbgs() << "BIND_OPCODE_SET_DYLIB_ORDINAL_IMM: "
<< "Ordinal=" << Ordinal << "\n");
break;
case MachO::BIND_OPCODE_SET_DYLIB_ORDINAL_ULEB:
if (TableKind == Kind::Weak) {
*E = malformedError("BIND_OPCODE_SET_DYLIB_ORDINAL_ULEB not allowed in "
"weak bind table for opcode at: 0x" +
utohexstr(OpcodeStart - Opcodes.begin()));
moveToEnd();
return;
}
Ordinal = readULEB128(&error);
LibraryOrdinalSet = true;
if (error) {
*E = malformedError("for BIND_OPCODE_SET_DYLIB_ORDINAL_ULEB " +
Twine(error) + " for opcode at: 0x" +
utohexstr(OpcodeStart - Opcodes.begin()));
moveToEnd();
return;
}
if (Ordinal > (int)O->getLibraryCount()) {
*E = malformedError("for BIND_OPCODE_SET_DYLIB_ORDINAL_ULEB bad "
"library ordinal: " + Twine((int)Ordinal) + " (max " +
Twine((int)O->getLibraryCount()) + ") for opcode at: 0x" +
utohexstr(OpcodeStart - Opcodes.begin()));
moveToEnd();
return;
}
DEBUG_WITH_TYPE(
"mach-o-bind",
dbgs() << "BIND_OPCODE_SET_DYLIB_ORDINAL_ULEB: "
<< "Ordinal=" << Ordinal << "\n");
break;
case MachO::BIND_OPCODE_SET_DYLIB_SPECIAL_IMM:
if (TableKind == Kind::Weak) {
*E = malformedError("BIND_OPCODE_SET_DYLIB_SPECIAL_IMM not allowed in "
"weak bind table for opcode at: 0x" +
utohexstr(OpcodeStart - Opcodes.begin()));
moveToEnd();
return;
}
if (ImmValue) {
SignExtended = MachO::BIND_OPCODE_MASK | ImmValue;
Ordinal = SignExtended;
LibraryOrdinalSet = true;
if (Ordinal < MachO::BIND_SPECIAL_DYLIB_FLAT_LOOKUP) {
*E = malformedError("for BIND_OPCODE_SET_DYLIB_SPECIAL_IMM unknown "
"special ordinal: " + Twine((int)Ordinal) + " for opcode at: "
"0x" + utohexstr(OpcodeStart - Opcodes.begin()));
moveToEnd();
return;
}
} else
Ordinal = 0;
DEBUG_WITH_TYPE(
"mach-o-bind",
dbgs() << "BIND_OPCODE_SET_DYLIB_SPECIAL_IMM: "
<< "Ordinal=" << Ordinal << "\n");
break;
case MachO::BIND_OPCODE_SET_SYMBOL_TRAILING_FLAGS_IMM:
Flags = ImmValue;
SymStart = Ptr;
while (*Ptr && (Ptr < Opcodes.end())) {
++Ptr;
}
if (Ptr == Opcodes.end()) {
*E = malformedError("for BIND_OPCODE_SET_SYMBOL_TRAILING_FLAGS_IMM "
"symbol name extends past opcodes for opcode at: 0x" +
utohexstr(OpcodeStart - Opcodes.begin()));
moveToEnd();
return;
}
SymbolName = StringRef(reinterpret_cast<const char*>(SymStart),
Ptr-SymStart);
++Ptr;
DEBUG_WITH_TYPE(
"mach-o-bind",
dbgs() << "BIND_OPCODE_SET_SYMBOL_TRAILING_FLAGS_IMM: "
<< "SymbolName=" << SymbolName << "\n");
if (TableKind == Kind::Weak) {
if (ImmValue & MachO::BIND_SYMBOL_FLAGS_NON_WEAK_DEFINITION)
return;
}
break;
case MachO::BIND_OPCODE_SET_TYPE_IMM:
BindType = ImmValue;
if (ImmValue > MachO::BIND_TYPE_TEXT_PCREL32) {
*E = malformedError("for BIND_OPCODE_SET_TYPE_IMM bad bind type: " +
Twine((int)ImmValue) + " for opcode at: 0x" +
utohexstr(OpcodeStart - Opcodes.begin()));
moveToEnd();
return;
}
DEBUG_WITH_TYPE(
"mach-o-bind",
dbgs() << "BIND_OPCODE_SET_TYPE_IMM: "
<< "BindType=" << (int)BindType << "\n");
break;
case MachO::BIND_OPCODE_SET_ADDEND_SLEB:
Addend = readSLEB128(&error);
if (error) {
*E = malformedError("for BIND_OPCODE_SET_ADDEND_SLEB " +
Twine(error) + " for opcode at: 0x" +
utohexstr(OpcodeStart - Opcodes.begin()));
moveToEnd();
return;
}
DEBUG_WITH_TYPE(
"mach-o-bind",
dbgs() << "BIND_OPCODE_SET_ADDEND_SLEB: "
<< "Addend=" << Addend << "\n");
break;
case MachO::BIND_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB:
SegmentIndex = ImmValue;
SegmentOffset = readULEB128(&error);
if (error) {
*E = malformedError("for BIND_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB " +
Twine(error) + " for opcode at: 0x" +
utohexstr(OpcodeStart - Opcodes.begin()));
moveToEnd();
return;
}
error = O->BindEntryCheckSegAndOffset(SegmentIndex, SegmentOffset, true);
if (error) {
*E = malformedError("for BIND_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB " +
Twine(error) + " for opcode at: 0x" +
utohexstr(OpcodeStart - Opcodes.begin()));
moveToEnd();
return;
}
DEBUG_WITH_TYPE(
"mach-o-bind",
dbgs() << "BIND_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB: "
<< "SegmentIndex=" << SegmentIndex << ", "
<< format("SegmentOffset=0x%06X", SegmentOffset)
<< "\n");
break;
case MachO::BIND_OPCODE_ADD_ADDR_ULEB:
SegmentOffset += readULEB128(&error);
if (error) {
*E = malformedError("for BIND_OPCODE_ADD_ADDR_ULEB " +
Twine(error) + " for opcode at: 0x" +
utohexstr(OpcodeStart - Opcodes.begin()));
moveToEnd();
return;
}
error = O->BindEntryCheckSegAndOffset(SegmentIndex, SegmentOffset, true);
if (error) {
*E = malformedError("for BIND_OPCODE_ADD_ADDR_ULEB " +
Twine(error) + " for opcode at: 0x" +
utohexstr(OpcodeStart - Opcodes.begin()));
moveToEnd();
return;
}
DEBUG_WITH_TYPE("mach-o-bind",
dbgs() << "BIND_OPCODE_ADD_ADDR_ULEB: "
<< format("SegmentOffset=0x%06X",
SegmentOffset) << "\n");
break;
case MachO::BIND_OPCODE_DO_BIND:
AdvanceAmount = PointerSize;
RemainingLoopCount = 0;
error = O->BindEntryCheckSegAndOffset(SegmentIndex, SegmentOffset, true);
if (error) {
*E = malformedError("for BIND_OPCODE_DO_BIND " + Twine(error) +
" for opcode at: 0x" + utohexstr(OpcodeStart - Opcodes.begin()));
moveToEnd();
return;
}
if (SymbolName == StringRef()) {
*E = malformedError("for BIND_OPCODE_DO_BIND missing preceding "
"BIND_OPCODE_SET_SYMBOL_TRAILING_FLAGS_IMM for opcode at: 0x" +
utohexstr(OpcodeStart - Opcodes.begin()));
moveToEnd();
return;
}
if (!LibraryOrdinalSet && TableKind != Kind::Weak) {
*E = malformedError("for BIND_OPCODE_DO_BIND missing preceding "
"BIND_OPCODE_SET_DYLIB_ORDINAL_* for opcode at: 0x" +
utohexstr(OpcodeStart - Opcodes.begin()));
moveToEnd();
return;
}
DEBUG_WITH_TYPE("mach-o-bind",
dbgs() << "BIND_OPCODE_DO_BIND: "
<< format("SegmentOffset=0x%06X",
SegmentOffset) << "\n");
return;
case MachO::BIND_OPCODE_DO_BIND_ADD_ADDR_ULEB:
if (TableKind == Kind::Lazy) {
*E = malformedError("BIND_OPCODE_DO_BIND_ADD_ADDR_ULEB not allowed in "
"lazy bind table for opcode at: 0x" +
utohexstr(OpcodeStart - Opcodes.begin()));
moveToEnd();
return;
}
error = O->BindEntryCheckSegAndOffset(SegmentIndex, SegmentOffset, true);
if (error) {
*E = malformedError("for BIND_OPCODE_DO_BIND_ADD_ADDR_ULEB " +
Twine(error) + " for opcode at: 0x" +
utohexstr(OpcodeStart - Opcodes.begin()));
moveToEnd();
return;
}
if (SymbolName == StringRef()) {
*E = malformedError("for BIND_OPCODE_DO_BIND_ADD_ADDR_ULEB missing "
"preceding BIND_OPCODE_SET_SYMBOL_TRAILING_FLAGS_IMM for opcode "
"at: 0x" + utohexstr(OpcodeStart - Opcodes.begin()));
moveToEnd();
return;
}
if (!LibraryOrdinalSet && TableKind != Kind::Weak) {
*E = malformedError("for BIND_OPCODE_DO_BIND_ADD_ADDR_ULEB missing "
"preceding BIND_OPCODE_SET_DYLIB_ORDINAL_* for opcode at: 0x" +
utohexstr(OpcodeStart - Opcodes.begin()));
moveToEnd();
return;
}
AdvanceAmount = readULEB128(&error) + PointerSize;
if (error) {
*E = malformedError("for BIND_OPCODE_DO_BIND_ADD_ADDR_ULEB " +
Twine(error) + " for opcode at: 0x" +
utohexstr(OpcodeStart - Opcodes.begin()));
moveToEnd();
return;
}
// Note, this is not really an error until the next bind but make no sense
// for a BIND_OPCODE_DO_BIND_ADD_ADDR_ULEB to not be followed by another
// bind operation.
error = O->BindEntryCheckSegAndOffset(SegmentIndex, SegmentOffset +
AdvanceAmount, false);
if (error) {
*E = malformedError("for BIND_OPCODE_ADD_ADDR_ULEB (after adding "
"ULEB) " + Twine(error) + " for opcode at: 0x" +
utohexstr(OpcodeStart - Opcodes.begin()));
moveToEnd();
return;
}
RemainingLoopCount = 0;
DEBUG_WITH_TYPE(
"mach-o-bind",
dbgs() << "BIND_OPCODE_DO_BIND_ADD_ADDR_ULEB: "
<< format("SegmentOffset=0x%06X", SegmentOffset)
<< ", AdvanceAmount=" << AdvanceAmount
<< ", RemainingLoopCount=" << RemainingLoopCount
<< "\n");
return;
case MachO::BIND_OPCODE_DO_BIND_ADD_ADDR_IMM_SCALED:
if (TableKind == Kind::Lazy) {
*E = malformedError("BIND_OPCODE_DO_BIND_ADD_ADDR_IMM_SCALED not "
"allowed in lazy bind table for opcode at: 0x" +
utohexstr(OpcodeStart - Opcodes.begin()));
moveToEnd();
return;
}
error = O->BindEntryCheckSegAndOffset(SegmentIndex, SegmentOffset, true);
if (error) {
*E = malformedError("for BIND_OPCODE_DO_BIND_ADD_ADDR_IMM_SCALED " +
Twine(error) + " for opcode at: 0x" +
utohexstr(OpcodeStart - Opcodes.begin()));
moveToEnd();
return;
}
if (SymbolName == StringRef()) {
*E = malformedError("for BIND_OPCODE_DO_BIND_ADD_ADDR_IMM_SCALED "
"missing preceding BIND_OPCODE_SET_SYMBOL_TRAILING_FLAGS_IMM for "
"opcode at: 0x" + utohexstr(OpcodeStart - Opcodes.begin()));
moveToEnd();
return;
}
if (!LibraryOrdinalSet && TableKind != Kind::Weak) {
*E = malformedError("for BIND_OPCODE_DO_BIND_ADD_ADDR_IMM_SCALED "
"missing preceding BIND_OPCODE_SET_DYLIB_ORDINAL_* for opcode "
"at: 0x" + utohexstr(OpcodeStart - Opcodes.begin()));
moveToEnd();
return;
}
AdvanceAmount = ImmValue * PointerSize + PointerSize;
RemainingLoopCount = 0;
error = O->BindEntryCheckSegAndOffset(SegmentIndex, SegmentOffset +
AdvanceAmount, false);
if (error) {
*E = malformedError("for BIND_OPCODE_DO_BIND_ADD_ADDR_IMM_SCALED "
" (after adding immediate times the pointer size) " +
Twine(error) + " for opcode at: 0x" +
utohexstr(OpcodeStart - Opcodes.begin()));
moveToEnd();
return;
}
DEBUG_WITH_TYPE("mach-o-bind",
dbgs()
<< "BIND_OPCODE_DO_BIND_ADD_ADDR_IMM_SCALED: "
<< format("SegmentOffset=0x%06X", SegmentOffset) << "\n");
return;
case MachO::BIND_OPCODE_DO_BIND_ULEB_TIMES_SKIPPING_ULEB:
if (TableKind == Kind::Lazy) {
*E = malformedError("BIND_OPCODE_DO_BIND_ULEB_TIMES_SKIPPING_ULEB not "
"allowed in lazy bind table for opcode at: 0x" +
utohexstr(OpcodeStart - Opcodes.begin()));
moveToEnd();
return;
}
Count = readULEB128(&error);
if (Count != 0)
RemainingLoopCount = Count - 1;
else
RemainingLoopCount = 0;
if (error) {
*E = malformedError("for BIND_OPCODE_DO_BIND_ULEB_TIMES_SKIPPING_ULEB "
" (count value) " + Twine(error) + " for opcode at"
": 0x" + utohexstr(OpcodeStart - Opcodes.begin()));
moveToEnd();
return;
}
Skip = readULEB128(&error);
AdvanceAmount = Skip + PointerSize;
if (error) {
*E = malformedError("for BIND_OPCODE_DO_BIND_ULEB_TIMES_SKIPPING_ULEB "
" (skip value) " + Twine(error) + " for opcode at"
": 0x" + utohexstr(OpcodeStart - Opcodes.begin()));
moveToEnd();
return;
}
error = O->BindEntryCheckSegAndOffset(SegmentIndex, SegmentOffset, true);
if (error) {
*E = malformedError("for BIND_OPCODE_DO_BIND_ULEB_TIMES_SKIPPING_ULEB "
+ Twine(error) + " for opcode at: 0x" +
utohexstr(OpcodeStart - Opcodes.begin()));
moveToEnd();
return;
}
if (SymbolName == StringRef()) {
*E = malformedError("for BIND_OPCODE_DO_BIND_ULEB_TIMES_SKIPPING_ULEB "
"missing preceding BIND_OPCODE_SET_SYMBOL_TRAILING_FLAGS_IMM for "
"opcode at: 0x" + utohexstr(OpcodeStart - Opcodes.begin()));
moveToEnd();
return;
}
if (!LibraryOrdinalSet && TableKind != Kind::Weak) {
*E = malformedError("for BIND_OPCODE_DO_BIND_ULEB_TIMES_SKIPPING_ULEB "
"missing preceding BIND_OPCODE_SET_DYLIB_ORDINAL_* for opcode "
"at: 0x" + utohexstr(OpcodeStart - Opcodes.begin()));
moveToEnd();
return;
}
error = O->BindEntryCheckCountAndSkip(Count, Skip, PointerSize,
SegmentIndex, SegmentOffset);
if (error) {
*E = malformedError("for BIND_OPCODE_DO_BIND_ULEB_TIMES_SKIPPING_ULEB "
+ Twine(error) + " for opcode at: 0x" +
utohexstr(OpcodeStart - Opcodes.begin()));
moveToEnd();
return;
}
DEBUG_WITH_TYPE(
"mach-o-bind",
dbgs() << "BIND_OPCODE_DO_BIND_ULEB_TIMES_SKIPPING_ULEB: "
<< format("SegmentOffset=0x%06X", SegmentOffset)
<< ", AdvanceAmount=" << AdvanceAmount
<< ", RemainingLoopCount=" << RemainingLoopCount
<< "\n");
return;
default:
*E = malformedError("bad bind info (bad opcode value 0x" +
utohexstr(Opcode) + " for opcode at: 0x" +
utohexstr(OpcodeStart - Opcodes.begin()));
moveToEnd();
return;
}
}
}
uint64_t MachOBindEntry::readULEB128(const char **error) {
unsigned Count;
uint64_t Result = decodeULEB128(Ptr, &Count, Opcodes.end(), error);
Ptr += Count;
if (Ptr > Opcodes.end())
Ptr = Opcodes.end();
return Result;
}
int64_t MachOBindEntry::readSLEB128(const char **error) {
unsigned Count;
int64_t Result = decodeSLEB128(Ptr, &Count, Opcodes.end(), error);
Ptr += Count;
if (Ptr > Opcodes.end())
Ptr = Opcodes.end();
return Result;
}
int32_t MachOBindEntry::segmentIndex() const { return SegmentIndex; }
uint64_t MachOBindEntry::segmentOffset() const { return SegmentOffset; }
StringRef MachOBindEntry::typeName() const {
switch (BindType) {
case MachO::BIND_TYPE_POINTER:
return "pointer";
case MachO::BIND_TYPE_TEXT_ABSOLUTE32:
return "text abs32";
case MachO::BIND_TYPE_TEXT_PCREL32:
return "text rel32";
}
return "unknown";
}
StringRef MachOBindEntry::symbolName() const { return SymbolName; }
int64_t MachOBindEntry::addend() const { return Addend; }
uint32_t MachOBindEntry::flags() const { return Flags; }
int MachOBindEntry::ordinal() const { return Ordinal; }
// For use with the SegIndex of a checked Mach-O Bind entry
// to get the segment name.
StringRef MachOBindEntry::segmentName() const {
return O->BindRebaseSegmentName(SegmentIndex);
}
// For use with a SegIndex,SegOffset pair from a checked Mach-O Bind entry
// to get the section name.
StringRef MachOBindEntry::sectionName() const {
return O->BindRebaseSectionName(SegmentIndex, SegmentOffset);
}
// For use with a SegIndex,SegOffset pair from a checked Mach-O Bind entry
// to get the address.
uint64_t MachOBindEntry::address() const {
return O->BindRebaseAddress(SegmentIndex, SegmentOffset);
}
bool MachOBindEntry::operator==(const MachOBindEntry &Other) const {
#ifdef EXPENSIVE_CHECKS
assert(Opcodes == Other.Opcodes && "compare iterators of different files");
#else
assert(Opcodes.data() == Other.Opcodes.data() && "compare iterators of different files");
#endif
return (Ptr == Other.Ptr) &&
(RemainingLoopCount == Other.RemainingLoopCount) &&
(Done == Other.Done);
}
// Build table of sections so SegIndex/SegOffset pairs can be translated.
BindRebaseSegInfo::BindRebaseSegInfo(const object::MachOObjectFile *Obj) {
uint32_t CurSegIndex = Obj->hasPageZeroSegment() ? 1 : 0;
StringRef CurSegName;
uint64_t CurSegAddress;
for (const SectionRef &Section : Obj->sections()) {
SectionInfo Info;
Section.getName(Info.SectionName);
Info.Address = Section.getAddress();
Info.Size = Section.getSize();
Info.SegmentName =
Obj->getSectionFinalSegmentName(Section.getRawDataRefImpl());
if (!Info.SegmentName.equals(CurSegName)) {
++CurSegIndex;
CurSegName = Info.SegmentName;
CurSegAddress = Info.Address;
}
Info.SegmentIndex = CurSegIndex - 1;
Info.OffsetInSegment = Info.Address - CurSegAddress;
Info.SegmentStartAddress = CurSegAddress;
Sections.push_back(Info);
}
MaxSegIndex = CurSegIndex;
}
// For use with a SegIndex,SegOffset pair in MachOBindEntry::moveNext() to
// validate a MachOBindEntry or MachORebaseEntry.
const char * BindRebaseSegInfo::checkSegAndOffset(int32_t SegIndex,
uint64_t SegOffset,
bool endInvalid) {
if (SegIndex == -1)
return "missing preceding *_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB";
if (SegIndex >= MaxSegIndex)
return "bad segIndex (too large)";
for (const SectionInfo &SI : Sections) {
if (SI.SegmentIndex != SegIndex)
continue;
if (SI.OffsetInSegment > SegOffset)
continue;
if (SegOffset > (SI.OffsetInSegment + SI.Size))
continue;
if (endInvalid && SegOffset >= (SI.OffsetInSegment + SI.Size))
continue;
return nullptr;
}
return "bad segOffset, too large";
}
// For use in MachOBindEntry::moveNext() to validate a MachOBindEntry for
// the BIND_OPCODE_DO_BIND_ULEB_TIMES_SKIPPING_ULEB opcode and for use in
// MachORebaseEntry::moveNext() to validate a MachORebaseEntry for
// REBASE_OPCODE_DO_*_TIMES* opcodes. The SegIndex and SegOffset must have
// been already checked.
const char * BindRebaseSegInfo::checkCountAndSkip(uint32_t Count, uint32_t Skip,
uint8_t PointerSize,
int32_t SegIndex,
uint64_t SegOffset) {
const SectionInfo &SI = findSection(SegIndex, SegOffset);
uint64_t addr = SI.SegmentStartAddress + SegOffset;
if (addr >= SI.Address + SI.Size)
return "bad segOffset, too large";
uint64_t i = 0;
if (Count > 1)
i = (Skip + PointerSize) * (Count - 1);
else if (Count == 1)
i = Skip + PointerSize;
if (addr + i >= SI.Address + SI.Size) {
// For rebase opcodes they can step from one section to another.
uint64_t TrailingSegOffset = (addr + i) - SI.SegmentStartAddress;
const char *error = checkSegAndOffset(SegIndex, TrailingSegOffset, false);
if (error)
return "bad count and skip, too large";
}
return nullptr;
}
// For use with the SegIndex of a checked Mach-O Bind or Rebase entry
// to get the segment name.
StringRef BindRebaseSegInfo::segmentName(int32_t SegIndex) {
for (const SectionInfo &SI : Sections) {
if (SI.SegmentIndex == SegIndex)
return SI.SegmentName;
}
llvm_unreachable("invalid SegIndex");
}
// For use with a SegIndex,SegOffset pair from a checked Mach-O Bind or Rebase
// to get the SectionInfo.
const BindRebaseSegInfo::SectionInfo &BindRebaseSegInfo::findSection(
int32_t SegIndex, uint64_t SegOffset) {
for (const SectionInfo &SI : Sections) {
if (SI.SegmentIndex != SegIndex)
continue;
if (SI.OffsetInSegment > SegOffset)
continue;
if (SegOffset >= (SI.OffsetInSegment + SI.Size))
continue;
return SI;
}
llvm_unreachable("SegIndex and SegOffset not in any section");
}
// For use with a SegIndex,SegOffset pair from a checked Mach-O Bind or Rebase
// entry to get the section name.
StringRef BindRebaseSegInfo::sectionName(int32_t SegIndex,
uint64_t SegOffset) {
return findSection(SegIndex, SegOffset).SectionName;
}
// For use with a SegIndex,SegOffset pair from a checked Mach-O Bind or Rebase
// entry to get the address.
uint64_t BindRebaseSegInfo::address(uint32_t SegIndex, uint64_t OffsetInSeg) {
const SectionInfo &SI = findSection(SegIndex, OffsetInSeg);
return SI.SegmentStartAddress + OffsetInSeg;
}
iterator_range<bind_iterator>
MachOObjectFile::bindTable(Error &Err, MachOObjectFile *O,
ArrayRef<uint8_t> Opcodes, bool is64,
MachOBindEntry::Kind BKind) {
if (O->BindRebaseSectionTable == nullptr)
O->BindRebaseSectionTable = llvm::make_unique<BindRebaseSegInfo>(O);
MachOBindEntry Start(&Err, O, Opcodes, is64, BKind);
Start.moveToFirst();
MachOBindEntry Finish(&Err, O, Opcodes, is64, BKind);
Finish.moveToEnd();
return make_range(bind_iterator(Start), bind_iterator(Finish));
}
iterator_range<bind_iterator> MachOObjectFile::bindTable(Error &Err) {
return bindTable(Err, this, getDyldInfoBindOpcodes(), is64Bit(),
MachOBindEntry::Kind::Regular);
}
iterator_range<bind_iterator> MachOObjectFile::lazyBindTable(Error &Err) {
return bindTable(Err, this, getDyldInfoLazyBindOpcodes(), is64Bit(),
MachOBindEntry::Kind::Lazy);
}
iterator_range<bind_iterator> MachOObjectFile::weakBindTable(Error &Err) {
return bindTable(Err, this, getDyldInfoWeakBindOpcodes(), is64Bit(),
MachOBindEntry::Kind::Weak);
}
MachOObjectFile::load_command_iterator
MachOObjectFile::begin_load_commands() const {
return LoadCommands.begin();
}
MachOObjectFile::load_command_iterator
MachOObjectFile::end_load_commands() const {
return LoadCommands.end();
}
iterator_range<MachOObjectFile::load_command_iterator>
MachOObjectFile::load_commands() const {
return make_range(begin_load_commands(), end_load_commands());
}
StringRef
MachOObjectFile::getSectionFinalSegmentName(DataRefImpl Sec) const {
ArrayRef<char> Raw = getSectionRawFinalSegmentName(Sec);
return parseSegmentOrSectionName(Raw.data());
}
ArrayRef<char>
MachOObjectFile::getSectionRawName(DataRefImpl Sec) const {
assert(Sec.d.a < Sections.size() && "Should have detected this earlier");
const section_base *Base =
reinterpret_cast<const section_base *>(Sections[Sec.d.a]);
return makeArrayRef(Base->sectname);
}
ArrayRef<char>
MachOObjectFile::getSectionRawFinalSegmentName(DataRefImpl Sec) const {
assert(Sec.d.a < Sections.size() && "Should have detected this earlier");
const section_base *Base =
reinterpret_cast<const section_base *>(Sections[Sec.d.a]);
return makeArrayRef(Base->segname);
}
bool
MachOObjectFile::isRelocationScattered(const MachO::any_relocation_info &RE)
const {
if (getCPUType(*this) == MachO::CPU_TYPE_X86_64)
return false;
return getPlainRelocationAddress(RE) & MachO::R_SCATTERED;
}
unsigned MachOObjectFile::getPlainRelocationSymbolNum(
const MachO::any_relocation_info &RE) const {
if (isLittleEndian())
return RE.r_word1 & 0xffffff;
return RE.r_word1 >> 8;
}
bool MachOObjectFile::getPlainRelocationExternal(
const MachO::any_relocation_info &RE) const {
if (isLittleEndian())
return (RE.r_word1 >> 27) & 1;
return (RE.r_word1 >> 4) & 1;
}
bool MachOObjectFile::getScatteredRelocationScattered(
const MachO::any_relocation_info &RE) const {
return RE.r_word0 >> 31;
}
uint32_t MachOObjectFile::getScatteredRelocationValue(
const MachO::any_relocation_info &RE) const {
return RE.r_word1;
}
uint32_t MachOObjectFile::getScatteredRelocationType(
const MachO::any_relocation_info &RE) const {
return (RE.r_word0 >> 24) & 0xf;
}
unsigned MachOObjectFile::getAnyRelocationAddress(
const MachO::any_relocation_info &RE) const {
if (isRelocationScattered(RE))
return getScatteredRelocationAddress(RE);
return getPlainRelocationAddress(RE);
}
unsigned MachOObjectFile::getAnyRelocationPCRel(
const MachO::any_relocation_info &RE) const {
if (isRelocationScattered(RE))
return getScatteredRelocationPCRel(RE);
return getPlainRelocationPCRel(*this, RE);
}
unsigned MachOObjectFile::getAnyRelocationLength(
const MachO::any_relocation_info &RE) const {
if (isRelocationScattered(RE))
return getScatteredRelocationLength(RE);
return getPlainRelocationLength(*this, RE);
}
unsigned
MachOObjectFile::getAnyRelocationType(
const MachO::any_relocation_info &RE) const {
if (isRelocationScattered(RE))
return getScatteredRelocationType(RE);
return getPlainRelocationType(*this, RE);
}
SectionRef
MachOObjectFile::getAnyRelocationSection(
const MachO::any_relocation_info &RE) const {
if (isRelocationScattered(RE) || getPlainRelocationExternal(RE))
return *section_end();
unsigned SecNum = getPlainRelocationSymbolNum(RE);
if (SecNum == MachO::R_ABS || SecNum > Sections.size())
return *section_end();
DataRefImpl DRI;
DRI.d.a = SecNum - 1;
return SectionRef(DRI, this);
}
MachO::section MachOObjectFile::getSection(DataRefImpl DRI) const {
assert(DRI.d.a < Sections.size() && "Should have detected this earlier");
return getStruct<MachO::section>(*this, Sections[DRI.d.a]);
}
MachO::section_64 MachOObjectFile::getSection64(DataRefImpl DRI) const {
assert(DRI.d.a < Sections.size() && "Should have detected this earlier");
return getStruct<MachO::section_64>(*this, Sections[DRI.d.a]);
}
MachO::section MachOObjectFile::getSection(const LoadCommandInfo &L,
unsigned Index) const {
const char *Sec = getSectionPtr(*this, L, Index);
return getStruct<MachO::section>(*this, Sec);
}
MachO::section_64 MachOObjectFile::getSection64(const LoadCommandInfo &L,
unsigned Index) const {
const char *Sec = getSectionPtr(*this, L, Index);
return getStruct<MachO::section_64>(*this, Sec);
}
MachO::nlist
MachOObjectFile::getSymbolTableEntry(DataRefImpl DRI) const {
const char *P = reinterpret_cast<const char *>(DRI.p);
return getStruct<MachO::nlist>(*this, P);
}
MachO::nlist_64
MachOObjectFile::getSymbol64TableEntry(DataRefImpl DRI) const {
const char *P = reinterpret_cast<const char *>(DRI.p);
return getStruct<MachO::nlist_64>(*this, P);
}
MachO::linkedit_data_command
MachOObjectFile::getLinkeditDataLoadCommand(const LoadCommandInfo &L) const {
return getStruct<MachO::linkedit_data_command>(*this, L.Ptr);
}
MachO::segment_command
MachOObjectFile::getSegmentLoadCommand(const LoadCommandInfo &L) const {
return getStruct<MachO::segment_command>(*this, L.Ptr);
}
MachO::segment_command_64
MachOObjectFile::getSegment64LoadCommand(const LoadCommandInfo &L) const {
return getStruct<MachO::segment_command_64>(*this, L.Ptr);
}
MachO::linker_option_command
MachOObjectFile::getLinkerOptionLoadCommand(const LoadCommandInfo &L) const {
return getStruct<MachO::linker_option_command>(*this, L.Ptr);
}
MachO::version_min_command
MachOObjectFile::getVersionMinLoadCommand(const LoadCommandInfo &L) const {
return getStruct<MachO::version_min_command>(*this, L.Ptr);
}
MachO::note_command
MachOObjectFile::getNoteLoadCommand(const LoadCommandInfo &L) const {
return getStruct<MachO::note_command>(*this, L.Ptr);
}
MachO::build_version_command
MachOObjectFile::getBuildVersionLoadCommand(const LoadCommandInfo &L) const {
return getStruct<MachO::build_version_command>(*this, L.Ptr);
}
MachO::build_tool_version
MachOObjectFile::getBuildToolVersion(unsigned index) const {
return getStruct<MachO::build_tool_version>(*this, BuildTools[index]);
}
MachO::dylib_command
MachOObjectFile::getDylibIDLoadCommand(const LoadCommandInfo &L) const {
return getStruct<MachO::dylib_command>(*this, L.Ptr);
}
MachO::dyld_info_command
MachOObjectFile::getDyldInfoLoadCommand(const LoadCommandInfo &L) const {
return getStruct<MachO::dyld_info_command>(*this, L.Ptr);
}
MachO::dylinker_command
MachOObjectFile::getDylinkerCommand(const LoadCommandInfo &L) const {
return getStruct<MachO::dylinker_command>(*this, L.Ptr);
}
MachO::uuid_command
MachOObjectFile::getUuidCommand(const LoadCommandInfo &L) const {
return getStruct<MachO::uuid_command>(*this, L.Ptr);
}
MachO::rpath_command
MachOObjectFile::getRpathCommand(const LoadCommandInfo &L) const {
return getStruct<MachO::rpath_command>(*this, L.Ptr);
}
MachO::source_version_command
MachOObjectFile::getSourceVersionCommand(const LoadCommandInfo &L) const {
return getStruct<MachO::source_version_command>(*this, L.Ptr);
}
MachO::entry_point_command
MachOObjectFile::getEntryPointCommand(const LoadCommandInfo &L) const {
return getStruct<MachO::entry_point_command>(*this, L.Ptr);
}
MachO::encryption_info_command
MachOObjectFile::getEncryptionInfoCommand(const LoadCommandInfo &L) const {
return getStruct<MachO::encryption_info_command>(*this, L.Ptr);
}
MachO::encryption_info_command_64
MachOObjectFile::getEncryptionInfoCommand64(const LoadCommandInfo &L) const {
return getStruct<MachO::encryption_info_command_64>(*this, L.Ptr);
}
MachO::sub_framework_command
MachOObjectFile::getSubFrameworkCommand(const LoadCommandInfo &L) const {
return getStruct<MachO::sub_framework_command>(*this, L.Ptr);
}
MachO::sub_umbrella_command
MachOObjectFile::getSubUmbrellaCommand(const LoadCommandInfo &L) const {
return getStruct<MachO::sub_umbrella_command>(*this, L.Ptr);
}
MachO::sub_library_command
MachOObjectFile::getSubLibraryCommand(const LoadCommandInfo &L) const {
return getStruct<MachO::sub_library_command>(*this, L.Ptr);
}
MachO::sub_client_command
MachOObjectFile::getSubClientCommand(const LoadCommandInfo &L) const {
return getStruct<MachO::sub_client_command>(*this, L.Ptr);
}
MachO::routines_command
MachOObjectFile::getRoutinesCommand(const LoadCommandInfo &L) const {
return getStruct<MachO::routines_command>(*this, L.Ptr);
}
MachO::routines_command_64
MachOObjectFile::getRoutinesCommand64(const LoadCommandInfo &L) const {
return getStruct<MachO::routines_command_64>(*this, L.Ptr);
}
MachO::thread_command
MachOObjectFile::getThreadCommand(const LoadCommandInfo &L) const {
return getStruct<MachO::thread_command>(*this, L.Ptr);
}
MachO::any_relocation_info
MachOObjectFile::getRelocation(DataRefImpl Rel) const {
DataRefImpl Sec;
Sec.d.a = Rel.d.a;
uint32_t Offset;
if (is64Bit()) {
MachO::section_64 Sect = getSection64(Sec);
Offset = Sect.reloff;
} else {
MachO::section Sect = getSection(Sec);
Offset = Sect.reloff;
}
auto P = reinterpret_cast<const MachO::any_relocation_info *>(
getPtr(*this, Offset)) + Rel.d.b;
return getStruct<MachO::any_relocation_info>(
*this, reinterpret_cast<const char *>(P));
}
MachO::data_in_code_entry
MachOObjectFile::getDice(DataRefImpl Rel) const {
const char *P = reinterpret_cast<const char *>(Rel.p);
return getStruct<MachO::data_in_code_entry>(*this, P);
}
const MachO::mach_header &MachOObjectFile::getHeader() const {
return Header;
}
const MachO::mach_header_64 &MachOObjectFile::getHeader64() const {
assert(is64Bit());
return Header64;
}
uint32_t MachOObjectFile::getIndirectSymbolTableEntry(
const MachO::dysymtab_command &DLC,
unsigned Index) const {
uint64_t Offset = DLC.indirectsymoff + Index * sizeof(uint32_t);
return getStruct<uint32_t>(*this, getPtr(*this, Offset));
}
MachO::data_in_code_entry
MachOObjectFile::getDataInCodeTableEntry(uint32_t DataOffset,
unsigned Index) const {
uint64_t Offset = DataOffset + Index * sizeof(MachO::data_in_code_entry);
return getStruct<MachO::data_in_code_entry>(*this, getPtr(*this, Offset));
}
MachO::symtab_command MachOObjectFile::getSymtabLoadCommand() const {
if (SymtabLoadCmd)
return getStruct<MachO::symtab_command>(*this, SymtabLoadCmd);
// If there is no SymtabLoadCmd return a load command with zero'ed fields.
MachO::symtab_command Cmd;
Cmd.cmd = MachO::LC_SYMTAB;
Cmd.cmdsize = sizeof(MachO::symtab_command);
Cmd.symoff = 0;
Cmd.nsyms = 0;
Cmd.stroff = 0;
Cmd.strsize = 0;
return Cmd;
}
MachO::dysymtab_command MachOObjectFile::getDysymtabLoadCommand() const {
if (DysymtabLoadCmd)
return getStruct<MachO::dysymtab_command>(*this, DysymtabLoadCmd);
// If there is no DysymtabLoadCmd return a load command with zero'ed fields.
MachO::dysymtab_command Cmd;
Cmd.cmd = MachO::LC_DYSYMTAB;
Cmd.cmdsize = sizeof(MachO::dysymtab_command);
Cmd.ilocalsym = 0;
Cmd.nlocalsym = 0;
Cmd.iextdefsym = 0;
Cmd.nextdefsym = 0;
Cmd.iundefsym = 0;
Cmd.nundefsym = 0;
Cmd.tocoff = 0;
Cmd.ntoc = 0;
Cmd.modtaboff = 0;
Cmd.nmodtab = 0;
Cmd.extrefsymoff = 0;
Cmd.nextrefsyms = 0;
Cmd.indirectsymoff = 0;
Cmd.nindirectsyms = 0;
Cmd.extreloff = 0;
Cmd.nextrel = 0;
Cmd.locreloff = 0;
Cmd.nlocrel = 0;
return Cmd;
}
MachO::linkedit_data_command
MachOObjectFile::getDataInCodeLoadCommand() const {
if (DataInCodeLoadCmd)
return getStruct<MachO::linkedit_data_command>(*this, DataInCodeLoadCmd);
// If there is no DataInCodeLoadCmd return a load command with zero'ed fields.
MachO::linkedit_data_command Cmd;
Cmd.cmd = MachO::LC_DATA_IN_CODE;
Cmd.cmdsize = sizeof(MachO::linkedit_data_command);
Cmd.dataoff = 0;
Cmd.datasize = 0;
return Cmd;
}
MachO::linkedit_data_command
MachOObjectFile::getLinkOptHintsLoadCommand() const {
if (LinkOptHintsLoadCmd)
return getStruct<MachO::linkedit_data_command>(*this, LinkOptHintsLoadCmd);
// If there is no LinkOptHintsLoadCmd return a load command with zero'ed
// fields.
MachO::linkedit_data_command Cmd;
Cmd.cmd = MachO::LC_LINKER_OPTIMIZATION_HINT;
Cmd.cmdsize = sizeof(MachO::linkedit_data_command);
Cmd.dataoff = 0;
Cmd.datasize = 0;
return Cmd;
}
ArrayRef<uint8_t> MachOObjectFile::getDyldInfoRebaseOpcodes() const {
if (!DyldInfoLoadCmd)
return None;
MachO::dyld_info_command DyldInfo =
getStruct<MachO::dyld_info_command>(*this, DyldInfoLoadCmd);
const uint8_t *Ptr =
reinterpret_cast<const uint8_t *>(getPtr(*this, DyldInfo.rebase_off));
return makeArrayRef(Ptr, DyldInfo.rebase_size);
}
ArrayRef<uint8_t> MachOObjectFile::getDyldInfoBindOpcodes() const {
if (!DyldInfoLoadCmd)
return None;
MachO::dyld_info_command DyldInfo =
getStruct<MachO::dyld_info_command>(*this, DyldInfoLoadCmd);
const uint8_t *Ptr =
reinterpret_cast<const uint8_t *>(getPtr(*this, DyldInfo.bind_off));
return makeArrayRef(Ptr, DyldInfo.bind_size);
}
ArrayRef<uint8_t> MachOObjectFile::getDyldInfoWeakBindOpcodes() const {
if (!DyldInfoLoadCmd)
return None;
MachO::dyld_info_command DyldInfo =
getStruct<MachO::dyld_info_command>(*this, DyldInfoLoadCmd);
const uint8_t *Ptr =
reinterpret_cast<const uint8_t *>(getPtr(*this, DyldInfo.weak_bind_off));
return makeArrayRef(Ptr, DyldInfo.weak_bind_size);
}
ArrayRef<uint8_t> MachOObjectFile::getDyldInfoLazyBindOpcodes() const {
if (!DyldInfoLoadCmd)
return None;
MachO::dyld_info_command DyldInfo =
getStruct<MachO::dyld_info_command>(*this, DyldInfoLoadCmd);
const uint8_t *Ptr =
reinterpret_cast<const uint8_t *>(getPtr(*this, DyldInfo.lazy_bind_off));
return makeArrayRef(Ptr, DyldInfo.lazy_bind_size);
}
ArrayRef<uint8_t> MachOObjectFile::getDyldInfoExportsTrie() const {
if (!DyldInfoLoadCmd)
return None;
MachO::dyld_info_command DyldInfo =
getStruct<MachO::dyld_info_command>(*this, DyldInfoLoadCmd);
const uint8_t *Ptr =
reinterpret_cast<const uint8_t *>(getPtr(*this, DyldInfo.export_off));
return makeArrayRef(Ptr, DyldInfo.export_size);
}
ArrayRef<uint8_t> MachOObjectFile::getUuid() const {
if (!UuidLoadCmd)
return None;
// Returning a pointer is fine as uuid doesn't need endian swapping.
const char *Ptr = UuidLoadCmd + offsetof(MachO::uuid_command, uuid);
return makeArrayRef(reinterpret_cast<const uint8_t *>(Ptr), 16);
}
StringRef MachOObjectFile::getStringTableData() const {
MachO::symtab_command S = getSymtabLoadCommand();
return getData().substr(S.stroff, S.strsize);
}
bool MachOObjectFile::is64Bit() const {
return getType() == getMachOType(false, true) ||
getType() == getMachOType(true, true);
}
void MachOObjectFile::ReadULEB128s(uint64_t Index,
SmallVectorImpl<uint64_t> &Out) const {
DataExtractor extractor(ObjectFile::getData(), true, 0);
uint32_t offset = Index;
uint64_t data = 0;
while (uint64_t delta = extractor.getULEB128(&offset)) {
data += delta;
Out.push_back(data);
}
}
bool MachOObjectFile::isRelocatableObject() const {
return getHeader().filetype == MachO::MH_OBJECT;
}
Expected<std::unique_ptr<MachOObjectFile>>
ObjectFile::createMachOObjectFile(MemoryBufferRef Buffer,
uint32_t UniversalCputype,
uint32_t UniversalIndex) {
StringRef Magic = Buffer.getBuffer().slice(0, 4);
if (Magic == "\xFE\xED\xFA\xCE")
return MachOObjectFile::create(Buffer, false, false,
UniversalCputype, UniversalIndex);
if (Magic == "\xCE\xFA\xED\xFE")
return MachOObjectFile::create(Buffer, true, false,
UniversalCputype, UniversalIndex);
if (Magic == "\xFE\xED\xFA\xCF")
return MachOObjectFile::create(Buffer, false, true,
UniversalCputype, UniversalIndex);
if (Magic == "\xCF\xFA\xED\xFE")
return MachOObjectFile::create(Buffer, true, true,
UniversalCputype, UniversalIndex);
return make_error<GenericBinaryError>("Unrecognized MachO magic number",
object_error::invalid_file_type);
}
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