1 files changed, 108 insertions, 0 deletions
diff --git a/lld/lib/ReaderWriter/ELF/Hexagon/HexagonRelocationHandler.cpp b/lld/lib/ReaderWriter/ELF/Hexagon/HexagonRelocationHandler.cpp
new file mode 100644
index 00000000000..e237879cbd0
--- /dev/null
+++ b/lld/lib/ReaderWriter/ELF/Hexagon/HexagonRelocationHandler.cpp
@@ -0,0 +1,108 @@
+//===- lib/ReaderWriter/ELF/Hexagon/HexagonRelocationHandler.cpp ---------===//
+//
+//                             The LLVM Linker
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "HexagonTargetHandler.h"
+#include "HexagonTargetInfo.h"
+#include "HexagonRelocationHandler.h"
+
+
+using namespace lld;
+using namespace elf;
+
+using namespace llvm::ELF;
+
+namespace {
+/// \brief Word32_B22: 0x01ff3ffe : (S + A - P) >> 2 : Verify
+int relocB22PCREL(uint8_t *location, uint64_t P, uint64_t S, uint64_t A) {
+  int32_t result = (uint32_t)(((S + A) - P)>>2);
+  if ((result < 0x200000) && (result > -0x200000)) {
+    result = lld::scatterBits<int32_t>(result, 0x01ff3ffe);
+    *reinterpret_cast<llvm::support::ulittle32_t *>(location) = result |
+            (uint32_t)*reinterpret_cast<llvm::support::ulittle32_t *>(location);
+    return 0;
+  }
+  return 1;
+}
+
+/// \brief Word32_B15: 0x00df20fe : (S + A - P) >> 2 : Verify
+int relocB15PCREL(uint8_t *location, uint64_t P, uint64_t S, uint64_t A) {
+  int32_t result = (uint32_t)(((S + A) - P)>>2);
+  if ((result < 0x8000) && (result > -0x8000)) {
+    result = lld::scatterBits<int32_t>(result, 0x00df20fe);
+    *reinterpret_cast<llvm::support::ulittle32_t *>(location) = result |
+            (uint32_t)*reinterpret_cast<llvm::support::ulittle32_t *>(location);
+    return 0;
+  }
+  return 1;
+}
+
+/// \brief Word32_LO: 0x00c03fff : (S + A) : Truncate
+int relocLO16(uint8_t *location, uint64_t P, uint64_t S, uint64_t A) {
+  uint32_t result = (uint32_t)(S + A);
+  result = lld::scatterBits<int32_t>(result, 0x00c03fff);
+  *reinterpret_cast<llvm::support::ulittle32_t *>(location) = result |
+            (uint32_t)*reinterpret_cast<llvm::support::ulittle32_t *>(location);
+  return 0;
+}
+
+/// \brief Word32_LO: 0x00c03fff : (S + A) >> 16 : Truncate
+int relocHI16(uint8_t *location, uint64_t P, uint64_t S, uint64_t A) {
+  uint32_t result = (uint32_t)((S + A)>>16);
+  result = lld::scatterBits<int32_t>(result, 0x00c03fff);
+  *reinterpret_cast<llvm::support::ulittle32_t *>(location) = result |
+            (uint32_t)*reinterpret_cast<llvm::support::ulittle32_t *>(location);
+  return 0;
+}
+
+/// \brief Word32: 0xffffffff : (S + A) : Truncate
+int reloc32(uint8_t *location, uint64_t P, uint64_t S, uint64_t A) {
+  uint32_t result = (uint32_t)(S + A);
+  *reinterpret_cast<llvm::support::ulittle32_t *>(location) = result |
+            (uint32_t)*reinterpret_cast<llvm::support::ulittle32_t *>(location);
+  return 0;
+}
+} // end anon namespace
+
+ErrorOr<void> HexagonTargetRelocationHandler::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_HEX_B22_PCREL:
+    relocB22PCREL(location, relocVAddress, targetVAddress, ref.addend());
+    break;
+  case R_HEX_B15_PCREL:
+    relocB15PCREL(location, relocVAddress, targetVAddress, ref.addend());
+    break;
+  case R_HEX_LO16:
+    relocLO16(location, relocVAddress, targetVAddress, ref.addend());
+    break;
+  case R_HEX_HI16:
+    relocHI16(location, relocVAddress, targetVAddress, ref.addend());
+    break;
+  case R_HEX_32:
+    reloc32(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();
+}