1 files changed, 67 insertions, 0 deletions
diff --git a/lld/lib/ReaderWriter/ELF/X86/X86TargetHandler.cpp b/lld/lib/ReaderWriter/ELF/X86/X86TargetHandler.cpp
new file mode 100644
index 00000000000..df9109bacbf
--- /dev/null
+++ b/lld/lib/ReaderWriter/ELF/X86/X86TargetHandler.cpp
@@ -0,0 +1,67 @@
+//===- lib/ReaderWriter/ELF/X86/X86TargetHandler.cpp ----------------------===//
+//
+//                             The LLVM Linker
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "X86TargetHandler.h"
+#include "X86TargetInfo.h"
+
+using namespace lld;
+using namespace elf;
+
+using namespace llvm::ELF;
+
+namespace {
+/// \brief R_386_32 - word32:  S + A
+int reloc32(uint8_t *location, uint64_t P, uint64_t S, uint64_t A) {
+  int32_t result = (uint32_t)(S + A);
+  *reinterpret_cast<llvm::support::ulittle32_t *>(location) = result |
+            (uint32_t)*reinterpret_cast<llvm::support::ulittle32_t *>(location);
+  return X86KindHandler::NoError;
+}
+
+/// \brief R_386_PC32 - word32: S + A - P
+int relocPC32(uint8_t *location, uint64_t P, uint64_t S, uint64_t A) {
+  uint32_t result = (uint32_t)((S + A) - P);
+  *reinterpret_cast<llvm::support::ulittle32_t *>(location) = result +
+            (uint32_t)*reinterpret_cast<llvm::support::ulittle32_t *>(location);
+  return X86KindHandler::NoError;
+}
+} // end anon namespace
+
+ErrorOr<void> X86TargetRelocationHandler::applyRelocation(
+    ELFWriter &writer, llvm::FileOutputBuffer &buf, const AtomLayout &atom,
+    const Reference &ref) const {
+  uint8_t *atomContent = buf.getBufferStart() + atom._fileOffset;
+  uint8_t *location = atomContent + ref.offsetInAtom();
+  uint64_t targetVAddress = writer.addressOfAtom(ref.target());
+  uint64_t relocVAddress = atom._virtualAddr + ref.offsetInAtom();
+
+  switch (ref.kind()) {
+  case R_386_32:
+    reloc32(location, relocVAddress, targetVAddress, ref.addend());
+    break;
+  case R_386_PC32:
+    relocPC32(location, relocVAddress, targetVAddress, ref.addend());
+    break;
+  default: {
+    std::string str;
+    llvm::raw_string_ostream s(str);
+    auto name = _targetInfo.stringFromRelocKind(ref.kind());
+    s << "Unhandled relocation: "
+      << (name ? *name : "<unknown>" ) << " (" << ref.kind() << ")";
+    s.flush();
+    llvm_unreachable(str.c_str());
+  }
+  }
+
+  return error_code::success();
+}
+
+X86TargetHandler::X86TargetHandler(X86TargetInfo &targetInfo)
+    : DefaultTargetHandler(targetInfo), _relocationHandler(targetInfo) {
+}