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Add support for the new LC_NOTE load command.

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It describes a region of arbitrary data included in a Mach-O file.
Its initial use is to record extra data in MH_CORE files.

rdar://30001545
rdar://30001731

llvm-svn: 292500
This commit is contained in:
Kevin Enderby
2017-01-19 17:36:31 +00:00
parent 4687db0e09
commit a4579c4184
11 changed files with 137 additions and 0 deletions
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33
llvm/lib/Object/MachOObjectFile.cpp
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@@ -784,6 +784,31 @@ static Error checkVersCommand(const MachOObjectFile &Obj,
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 checkRpathCommand(const MachOObjectFile &Obj,
const MachOObjectFile::LoadCommandInfo &Load,
uint32_t LoadCommandIndex) {
@@ -1280,6 +1305,9 @@ MachOObjectFile::MachOObjectFile(MemoryBufferRef Object, bool IsLittleEndian,
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_RPATH) {
if ((Err = checkRpathCommand(*this, Load, I)))
return;
@@ -3289,6 +3317,11 @@ 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::dylib_command
MachOObjectFile::getDylibIDLoadCommand(const LoadCommandInfo &L) const {
return getStruct<MachO::dylib_command>(*this, L.Ptr);