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https://github.com/c64scene-ar/llvm-6502.git
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Add llvm-rtdyld support for loading 32-bit code.
Factor out the 64-bit specific bits into a helper function and add an equivalent that loads the 32-bit sections. This allows using llvm-rtdyld on ARM. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127892 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jim Grosbach
parent
05f98a39e5
commit
35fdeb7b37
@ -51,6 +51,157 @@ static int Error(const Twine &Msg) {
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}
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/* *** */
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static bool
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loadSegment32(const MachOObject *Obj,
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sys::MemoryBlock &Data,
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const MachOObject::LoadCommandInfo *SegmentLCI,
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const InMemoryStruct<macho::SymtabLoadCommand> &SymtabLC,
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StringMap<void*> &SymbolTable) {
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InMemoryStruct<macho::SegmentLoadCommand> Segment32LC;
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Obj->ReadSegmentLoadCommand(*SegmentLCI, Segment32LC);
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if (!Segment32LC)
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return Error("unable to load segment load command");
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// Map the segment into memory.
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std::string ErrorStr;
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Data = sys::Memory::AllocateRWX(Segment32LC->VMSize, 0, &ErrorStr);
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if (!Data.base())
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return Error("unable to allocate memory block: '" + ErrorStr + "'");
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memcpy(Data.base(), Obj->getData(Segment32LC->FileOffset,
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Segment32LC->FileSize).data(),
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Segment32LC->FileSize);
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memset((char*)Data.base() + Segment32LC->FileSize, 0,
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Segment32LC->VMSize - Segment32LC->FileSize);
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// Bind the section indices to address.
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void **SectionBases = new void*[Segment32LC->NumSections];
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for (unsigned i = 0; i != Segment32LC->NumSections; ++i) {
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InMemoryStruct<macho::Section> Sect;
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Obj->ReadSection(*SegmentLCI, i, Sect);
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if (!Sect)
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return Error("unable to load section: '" + Twine(i) + "'");
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// FIXME: We don't support relocations yet.
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if (Sect->NumRelocationTableEntries != 0)
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return Error("not yet implemented: relocations!");
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// FIXME: Improve check.
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if (Sect->Flags != 0x80000400)
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return Error("unsupported section type!");
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SectionBases[i] = (char*) Data.base() + Sect->Address;
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}
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// Bind all the symbols to address.
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for (unsigned i = 0; i != SymtabLC->NumSymbolTableEntries; ++i) {
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InMemoryStruct<macho::SymbolTableEntry> STE;
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Obj->ReadSymbolTableEntry(SymtabLC->SymbolTableOffset, i, STE);
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if (!STE)
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return Error("unable to read symbol: '" + Twine(i) + "'");
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if (STE->SectionIndex == 0)
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return Error("unexpected undefined symbol!");
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unsigned Index = STE->SectionIndex - 1;
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if (Index >= Segment32LC->NumSections)
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return Error("invalid section index for symbol: '" + Twine() + "'");
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// Get the symbol name.
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StringRef Name = Obj->getStringAtIndex(STE->StringIndex);
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// Get the section base address.
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void *SectionBase = SectionBases[Index];
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// Get the symbol address.
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void *Address = (char*) SectionBase + STE->Value;
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// FIXME: Check the symbol type and flags.
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if (STE->Type != 0xF)
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return Error("unexpected symbol type!");
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if (STE->Flags != 0x0)
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return Error("unexpected symbol type!");
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SymbolTable[Name] = Address;
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}
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delete SectionBases;
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return false;
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}
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static bool
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loadSegment64(const MachOObject *Obj,
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sys::MemoryBlock &Data,
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const MachOObject::LoadCommandInfo *SegmentLCI,
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const InMemoryStruct<macho::SymtabLoadCommand> &SymtabLC,
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StringMap<void*> &SymbolTable) {
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InMemoryStruct<macho::Segment64LoadCommand> Segment64LC;
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Obj->ReadSegment64LoadCommand(*SegmentLCI, Segment64LC);
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if (!Segment64LC)
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return Error("unable to load segment load command");
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// Map the segment into memory.
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std::string ErrorStr;
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Data = sys::Memory::AllocateRWX(Segment64LC->VMSize, 0, &ErrorStr);
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if (!Data.base())
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return Error("unable to allocate memory block: '" + ErrorStr + "'");
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memcpy(Data.base(), Obj->getData(Segment64LC->FileOffset,
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Segment64LC->FileSize).data(),
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Segment64LC->FileSize);
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memset((char*)Data.base() + Segment64LC->FileSize, 0,
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Segment64LC->VMSize - Segment64LC->FileSize);
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// Bind the section indices to address.
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void **SectionBases = new void*[Segment64LC->NumSections];
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for (unsigned i = 0; i != Segment64LC->NumSections; ++i) {
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InMemoryStruct<macho::Section64> Sect;
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Obj->ReadSection64(*SegmentLCI, i, Sect);
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if (!Sect)
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return Error("unable to load section: '" + Twine(i) + "'");
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// FIXME: We don't support relocations yet.
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if (Sect->NumRelocationTableEntries != 0)
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return Error("not yet implemented: relocations!");
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// FIXME: Improve check.
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if (Sect->Flags != 0x80000400)
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return Error("unsupported section type!");
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SectionBases[i] = (char*) Data.base() + Sect->Address;
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}
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// Bind all the symbols to address.
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for (unsigned i = 0; i != SymtabLC->NumSymbolTableEntries; ++i) {
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InMemoryStruct<macho::Symbol64TableEntry> STE;
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Obj->ReadSymbol64TableEntry(SymtabLC->SymbolTableOffset, i, STE);
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if (!STE)
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return Error("unable to read symbol: '" + Twine(i) + "'");
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if (STE->SectionIndex == 0)
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return Error("unexpected undefined symbol!");
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unsigned Index = STE->SectionIndex - 1;
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if (Index >= Segment64LC->NumSections)
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return Error("invalid section index for symbol: '" + Twine() + "'");
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// Get the symbol name.
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StringRef Name = Obj->getStringAtIndex(STE->StringIndex);
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// Get the section base address.
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void *SectionBase = SectionBases[Index];
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// Get the symbol address.
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void *Address = (char*) SectionBase + STE->Value;
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// FIXME: Check the symbol type and flags.
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if (STE->Type != 0xF)
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return Error("unexpected symbol type!");
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if (STE->Flags != 0x0)
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return Error("unexpected symbol type!");
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SymbolTable[Name] = Address;
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}
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delete SectionBases;
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return false;
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}
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static int executeInput() {
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// Load the input memory buffer.
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@ -122,73 +273,14 @@ static int executeInput() {
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}
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// Load the segment load command.
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if (SegmentLCI->Command.Type != macho::LCT_Segment64)
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return Error("Segment32 not yet implemented!");
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InMemoryStruct<macho::Segment64LoadCommand> Segment64LC;
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Obj->ReadSegment64LoadCommand(*SegmentLCI, Segment64LC);
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if (!Segment64LC)
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return Error("unable to load segment load command");
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// Map the segment into memory.
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sys::MemoryBlock Data = sys::Memory::AllocateRWX(Segment64LC->VMSize,
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0, &ErrorStr);
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if (!Data.base())
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return Error("unable to allocate memory block: '" + ErrorStr + "'");
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memcpy(Data.base(), Obj->getData(Segment64LC->FileOffset,
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Segment64LC->FileSize).data(),
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Segment64LC->FileSize);
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memset((char*)Data.base() + Segment64LC->FileSize, 0,
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Segment64LC->VMSize - Segment64LC->FileSize);
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// Bind the section indices to address.
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void **SectionBases = new void*[Segment64LC->NumSections];
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for (unsigned i = 0; i != Segment64LC->NumSections; ++i) {
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InMemoryStruct<macho::Section64> Sect;
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Obj->ReadSection64(*SegmentLCI, i, Sect);
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if (!Sect)
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return Error("unable to load section: '" + Twine(i) + "'");
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// FIXME: We don't support relocations yet.
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if (Sect->NumRelocationTableEntries != 0)
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return Error("not yet implemented: relocations!");
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// FIXME: Improve check.
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if (Sect->Flags != 0x80000400)
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return Error("unsupported section type!");
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SectionBases[i] = (char*) Data.base() + Sect->Address;
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}
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// Bind all the symbols to address.
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sys::MemoryBlock Data;
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StringMap<void*> SymbolTable;
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for (unsigned i = 0; i != SymtabLC->NumSymbolTableEntries; ++i) {
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InMemoryStruct<macho::Symbol64TableEntry> STE;
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Obj->ReadSymbol64TableEntry(SymtabLC->SymbolTableOffset, i, STE);
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if (!STE)
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return Error("unable to read symbol: '" + Twine(i) + "'");
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if (STE->SectionIndex == 0)
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return Error("unexpected undefined symbol!");
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unsigned Index = STE->SectionIndex - 1;
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if (Index >= Segment64LC->NumSections)
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return Error("invalid section index for symbol: '" + Twine() + "'");
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// Get the symbol name.
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StringRef Name = Obj->getStringAtIndex(STE->StringIndex);
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// Get the section base address.
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void *SectionBase = SectionBases[Index];
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// Get the symbol address.
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void *Address = (char*) SectionBase + STE->Value;
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// FIXME: Check the symbol type and flags.
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if (STE->Type != 0xF)
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return Error("unexpected symbol type!");
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if (STE->Flags != 0x0)
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return Error("unexpected symbol type!");
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SymbolTable[Name] = Address;
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if (SegmentLCI->Command.Type == macho::LCT_Segment) {
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if (loadSegment32(Obj.get(), Data, SegmentLCI, SymtabLC, SymbolTable))
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return true;
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} else {
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if (loadSegment64(Obj.get(), Data, SegmentLCI, SymtabLC, SymbolTable))
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return true;
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}
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// Get the address of "_main".
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