// Scatter sections in all directions!
// Remaps section addresses for -verify mode. The following command line options
// can be used to customize the layout of the memory within the phony target's
// address space:
// -target-addr-start <s> -- Specify where the phony target addres range starts.
// -target-addr-end <e> -- Specify where the phony target address range ends.
// -target-section-sep <d> -- Specify how big a gap should be left between the
// end of one section and the start of the next.
// Defaults to zero. Set to something big
// (e.g. 1 << 32) to stress-test stubs, GOTs, etc.
//
void remapSections(const llvm::Triple &TargetTriple,
const TrivialMemoryManager &MemMgr,
RuntimeDyld &RTDyld) {
// If the -target-addr-end option wasn't explicitly passed, then set it to a
// sensible default based on the target triple.
if (TargetAddrEnd.getNumOccurrences() == 0) {
if (TargetTriple.isArch16Bit())
TargetAddrEnd = (1ULL << 16) - 1;
else if (TargetTriple.isArch32Bit())
TargetAddrEnd = (1ULL << 32) - 1;
// TargetAddrEnd already has a sensible default for 64-bit systems, so
// there's nothing to do in the 64-bit case.
}
uint64_t NextSectionAddress = TargetAddrStart;
// Remap code sections.
for (const auto& CodeSection : MemMgr.FunctionMemory) {
RTDyld.mapSectionAddress(CodeSection.base(), NextSectionAddress);
NextSectionAddress += CodeSection.size() + TargetSectionSep;
}
// Remap data sections.
for (const auto& DataSection : MemMgr.DataMemory) {
RTDyld.mapSectionAddress(DataSection.base(), NextSectionAddress);
NextSectionAddress += DataSection.size() + TargetSectionSep;
}
}
// Scatter sections in all directions!
// Remaps section addresses for -verify mode. The following command line options
// can be used to customize the layout of the memory within the phony target's
// address space:
// -target-addr-start <s> -- Specify where the phony target addres range starts.
// -target-addr-end <e> -- Specify where the phony target address range ends.
// -target-section-sep <d> -- Specify how big a gap should be left between the
// end of one section and the start of the next.
// Defaults to zero. Set to something big
// (e.g. 1 << 32) to stress-test stubs, GOTs, etc.
//
static void remapSectionsAndSymbols(const llvm::Triple &TargetTriple,
TrivialMemoryManager &MemMgr,
RuntimeDyldChecker &Checker) {
// Set up a work list (section addr/size pairs).
typedef std::list<std::pair<void*, uint64_t>> WorklistT;
WorklistT Worklist;
for (const auto& CodeSection : MemMgr.FunctionMemory)
Worklist.push_back(std::make_pair(CodeSection.base(), CodeSection.size()));
for (const auto& DataSection : MemMgr.DataMemory)
Worklist.push_back(std::make_pair(DataSection.base(), DataSection.size()));
// Apply any section-specific mappings that were requested on the command
// line.
typedef std::map<void*, uint64_t> AppliedMappingsT;
AppliedMappingsT AppliedMappings = applySpecificSectionMappings(Checker);
// Keep an "already allocated" mapping of section target addresses to sizes.
// Sections whose address mappings aren't specified on the command line will
// allocated around the explicitly mapped sections while maintaining the
// minimum separation.
std::map<uint64_t, uint64_t> AlreadyAllocated;
// Move the previously applied mappings into the already-allocated map.
for (WorklistT::iterator I = Worklist.begin(), E = Worklist.end();
I != E;) {
WorklistT::iterator Tmp = I;
++I;
AppliedMappingsT::iterator AI = AppliedMappings.find(Tmp->first);
if (AI != AppliedMappings.end()) {
AlreadyAllocated[AI->second] = Tmp->second;
Worklist.erase(Tmp);
}
}
// If the -target-addr-end option wasn't explicitly passed, then set it to a
// sensible default based on the target triple.
if (TargetAddrEnd.getNumOccurrences() == 0) {
if (TargetTriple.isArch16Bit())
TargetAddrEnd = (1ULL << 16) - 1;
else if (TargetTriple.isArch32Bit())
TargetAddrEnd = (1ULL << 32) - 1;
// TargetAddrEnd already has a sensible default for 64-bit systems, so
// there's nothing to do in the 64-bit case.
}
// Process any elements remaining in the worklist.
while (!Worklist.empty()) {
std::pair<void*, uint64_t> CurEntry = Worklist.front();
Worklist.pop_front();
uint64_t NextSectionAddr = TargetAddrStart;
for (const auto &Alloc : AlreadyAllocated)
if (NextSectionAddr + CurEntry.second + TargetSectionSep <= Alloc.first)
break;
else
NextSectionAddr = Alloc.first + Alloc.second + TargetSectionSep;
AlreadyAllocated[NextSectionAddr] = CurEntry.second;
Checker.getRTDyld().mapSectionAddress(CurEntry.first, NextSectionAddr);
}
// Add dummy symbols to the memory manager.
for (const auto &Mapping : DummySymbolMappings) {
size_t EqualsIdx = Mapping.find_first_of("=");
if (EqualsIdx == StringRef::npos)
report_fatal_error("Invalid dummy symbol specification '" + Mapping +
"'. Should be '<symbol name>=<addr>'");
std::string Symbol = Mapping.substr(0, EqualsIdx);
std::string AddrStr = Mapping.substr(EqualsIdx + 1);
uint64_t Addr;
if (StringRef(AddrStr).getAsInteger(0, Addr))
report_fatal_error("Invalid symbol mapping '" + Mapping + "'.");
MemMgr.addDummySymbol(Symbol, Addr);
}
}
