Ejemplo n.º 1
0
void RuntimeDyldImpl::resolveExternalSymbols() {
  StringMap<RelocationList>::iterator i = ExternalSymbolRelocations.begin(),
                                      e = ExternalSymbolRelocations.end();
  for (; i != e; i++) {
    StringRef Name = i->first();
    RelocationList &Relocs = i->second;
    SymbolTableMap::const_iterator Loc = GlobalSymbolTable.find(Name);
    if (Loc == GlobalSymbolTable.end()) {
      if (Name.size() == 0) {
        // This is an absolute symbol, use an address of zero.
        DEBUG(dbgs() << "Resolving absolute relocations." << "\n");
        resolveRelocationList(Relocs, 0);
      } else {
        // This is an external symbol, try to get its address from
        // MemoryManager.
        uint8_t *Addr = (uint8_t*) MemMgr->getPointerToNamedFunction(Name.data(),
                                                                   true);
        DEBUG(dbgs() << "Resolving relocations Name: " << Name
                << "\t" << format("%p", Addr)
                << "\n");
        resolveRelocationList(Relocs, (uintptr_t)Addr);
      }
    } else {
      report_fatal_error("Expected external symbol");
    }
  }
}
Ejemplo n.º 2
0
void RuntimeDyldImpl::resolveExternalSymbols() {
  while (!ExternalSymbolRelocations.empty()) {
    StringMap<RelocationList>::iterator i = ExternalSymbolRelocations.begin();

    StringRef Name = i->first();
    if (Name.size() == 0) {
      // This is an absolute symbol, use an address of zero.
      DEBUG(dbgs() << "Resolving absolute relocations."
                   << "\n");
      RelocationList &Relocs = i->second;
      resolveRelocationList(Relocs, 0);
    } else {
      uint64_t Addr = 0;
      SymbolTableMap::const_iterator Loc = GlobalSymbolTable.find(Name);
      if (Loc == GlobalSymbolTable.end()) {
        // This is an external symbol, try to get its address from
        // MemoryManager.
        Addr = MemMgr->getSymbolAddress(Name.data());
        // The call to getSymbolAddress may have caused additional modules to
        // be loaded, which may have added new entries to the
        // ExternalSymbolRelocations map.  Consquently, we need to update our
        // iterator.  This is also why retrieval of the relocation list
        // associated with this symbol is deferred until below this point.
        // New entries may have been added to the relocation list.
        i = ExternalSymbolRelocations.find(Name);
      } else {
        // We found the symbol in our global table.  It was probably in a
        // Module that we loaded previously.
        SymbolLoc SymLoc = Loc->second;
        Addr = getSectionLoadAddress(SymLoc.first) + SymLoc.second;
      }

      // FIXME: Implement error handling that doesn't kill the host program!
      if (!Addr)
        report_fatal_error("Program used external function '" + Name +
                           "' which could not be resolved!");

      updateGOTEntries(Name, Addr);
      DEBUG(dbgs() << "Resolving relocations Name: " << Name << "\t"
                   << format("0x%lx", Addr) << "\n");
      // This list may have been updated when we called getSymbolAddress, so
      // don't change this code to get the list earlier.
      RelocationList &Relocs = i->second;
      resolveRelocationList(Relocs, Addr);
    }

    ExternalSymbolRelocations.erase(i);
  }
}
Ejemplo n.º 3
0
// resolveSymbols - Resolve any relocations to the specified symbols if
// we know where it lives.
void RuntimeDyldImpl::resolveSymbols() {
  StringMap<RelocationList>::iterator i = SymbolRelocations.begin(),
                                      e = SymbolRelocations.end();
  for (; i != e; i++) {
    StringRef Name = i->first();
    RelocationList &Relocs = i->second;
    StringMap<SymbolLoc>::const_iterator Loc = SymbolTable.find(Name);
    if (Loc == SymbolTable.end()) {
      // This is an external symbol, try to get it address from
      // MemoryManager.
      uint8_t *Addr = (uint8_t*) MemMgr->getPointerToNamedFunction(Name.data(),
                                                                   true);
      DEBUG(dbgs() << "Resolving relocations Name: " << Name
              << "\t" << format("%p", Addr)
              << "\n");
      resolveRelocationList(Relocs, (uintptr_t)Addr);
    } else {
      // Change the relocation to be section relative rather than symbol
      // relative and move it to the resolved relocation list.
      DEBUG(dbgs() << "Resolving symbol '" << Name << "'\n");
      for (int i = 0, e = Relocs.size(); i != e; ++i) {
        RelocationEntry Entry = Relocs[i];
        Entry.Addend += Loc->second.second;
        Relocations[Loc->second.first].push_back(Entry);
      }
      Relocs.clear();
    }
  }
}
Ejemplo n.º 4
0
void RuntimeDyldImpl::resolveExternalSymbols() {
  while(!ExternalSymbolRelocations.empty()) {
    StringMap<RelocationList>::iterator i = ExternalSymbolRelocations.begin();

    StringRef Name = i->first();
    RelocationList &Relocs = i->second;
    if (Name.size() == 0) {
      // This is an absolute symbol, use an address of zero.
      DEBUG(dbgs() << "Resolving absolute relocations." << "\n");
      resolveRelocationList(Relocs, 0);
    } else {
      uint64_t Addr = 0;
      SymbolTableMap::const_iterator Loc = GlobalSymbolTable.find(Name);
      if (Loc == GlobalSymbolTable.end()) {
          // This is an external symbol, try to get its address from
          // MemoryManager.
          Addr = MemMgr->getSymbolAddress(Name.data());
      } else {
        // We found the symbol in our global table.  It was probably in a
        // Module that we loaded previously.
        SymbolLoc SymLoc = GlobalSymbolTable.lookup(Name);
        Addr = getSectionLoadAddress(SymLoc.first) + SymLoc.second;
      }

      // FIXME: Implement error handling that doesn't kill the host program!
      if (!Addr)
        report_fatal_error("Program used external function '" + Name +
                          "' which could not be resolved!");

      updateGOTEntries(Name, Addr);
      DEBUG(dbgs() << "Resolving relocations Name: " << Name
              << "\t" << format("0x%lx", Addr)
              << "\n");
      resolveRelocationList(Relocs, Addr);
    }

    ExternalSymbolRelocations.erase(i->first());
  }
}
Ejemplo n.º 5
0
// Resolve the relocations for all symbols we currently know about.
void RuntimeDyldImpl::resolveRelocations() {
  // First, resolve relocations associated with external symbols.
  resolveExternalSymbols();

  // Just iterate over the sections we have and resolve all the relocations
  // in them. Gross overkill, but it gets the job done.
  for (int i = 0, e = Sections.size(); i != e; ++i) {
    uint64_t Addr = Sections[i].LoadAddress;
    DEBUG(dbgs() << "Resolving relocations Section #" << i
            << "\t" << format("%p", (uint8_t *)Addr)
            << "\n");
    resolveRelocationList(Relocations[i], Addr);
  }
}
Ejemplo n.º 6
0
// Assign an address to a symbol name and resolve all the relocations
// associated with it.
void RuntimeDyldImpl::reassignSectionAddress(unsigned SectionID,
                                             uint64_t Addr) {
  // The address to use for relocation resolution is not
  // the address of the local section buffer. We must be doing
  // a remote execution environment of some sort. Re-apply any
  // relocations referencing this section with the given address.
  //
  // Addr is a uint64_t because we can't assume the pointer width
  // of the target is the same as that of the host. Just use a generic
  // "big enough" type.
  Sections[SectionID].LoadAddress = Addr;
  DEBUG(dbgs() << "Resolving relocations Section #" << SectionID
          << "\t" << format("%p", (uint8_t *)Addr)
          << "\n");
  resolveRelocationList(Relocations[SectionID], Addr);
}
Ejemplo n.º 7
0
// Resolve the relocations for all symbols we currently know about.
void RuntimeDyldImpl::resolveRelocations() {
  // First, resolve relocations associated with external symbols.
  resolveExternalSymbols();

  // Just iterate over the sections we have and resolve all the relocations
  // in them. Gross overkill, but it gets the job done.
  for (int i = 0, e = Sections.size(); i != e; ++i) {
    // The Section here (Sections[i]) refers to the section in which the
    // symbol for the relocation is located.  The SectionID in the relocation
    // entry provides the section to which the relocation will be applied.
    uint64_t Addr = Sections[i].LoadAddress;
    DEBUG(dbgs() << "Resolving relocations Section #" << i
            << "\t" << format("%p", (uint8_t *)Addr)
            << "\n");
    resolveRelocationList(Relocations[i], Addr);
    Relocations.erase(i);
  }
}