1 files changed, 58 insertions, 0 deletions

diff --git a/contrib/llvm-project/llvm/lib/Target/PowerPC/PPCTargetObjectFile.cpp b/contrib/llvm-project/llvm/lib/Target/PowerPC/PPCTargetObjectFile.cpp
new file mode 100644
index 000000000000..e237fab1b267
--- /dev/null
+++ b/contrib/llvm-project/llvm/lib/Target/PowerPC/PPCTargetObjectFile.cpp
@@ -0,0 +1,58 @@
+//===-- PPCTargetObjectFile.cpp - PPC Object Info -------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "PPCTargetObjectFile.h"
+#include "llvm/IR/Mangler.h"
+#include "llvm/MC/MCContext.h"
+#include "llvm/MC/MCExpr.h"
+#include "llvm/MC/MCSectionELF.h"
+
+using namespace llvm;
+
+void
+PPC64LinuxTargetObjectFile::
+Initialize(MCContext &Ctx, const TargetMachine &TM) {
+  TargetLoweringObjectFileELF::Initialize(Ctx, TM);
+  InitializeELF(TM.Options.UseInitArray);
+}
+
+MCSection *PPC64LinuxTargetObjectFile::SelectSectionForGlobal(
+    const GlobalObject *GO, SectionKind Kind, const TargetMachine &TM) const {
+  // Here override ReadOnlySection to DataRelROSection for PPC64 SVR4 ABI
+  // when we have a constant that contains global relocations.  This is
+  // necessary because of this ABI's handling of pointers to functions in
+  // a shared library.  The address of a function is actually the address
+  // of a function descriptor, which resides in the .opd section.  Generated
+  // code uses the descriptor directly rather than going via the GOT as some
+  // other ABIs do, which means that initialized function pointers must
+  // reference the descriptor.  The linker must convert copy relocs of
+  // pointers to functions in shared libraries into dynamic relocations,
+  // because of an ordering problem with initialization of copy relocs and
+  // PLT entries.  The dynamic relocation will be initialized by the dynamic
+  // linker, so we must use DataRelROSection instead of ReadOnlySection.
+  // For more information, see the description of ELIMINATE_COPY_RELOCS in
+  // GNU ld.
+  if (Kind.isReadOnly()) {
+    const auto *GVar = dyn_cast<GlobalVariable>(GO);
+
+    if (GVar && GVar->isConstant() && GVar->getInitializer()->needsRelocation())
+      Kind = SectionKind::getReadOnlyWithRel();
+  }
+
+  return TargetLoweringObjectFileELF::SelectSectionForGlobal(GO, Kind, TM);
+}
+
+const MCExpr *PPC64LinuxTargetObjectFile::
+getDebugThreadLocalSymbol(const MCSymbol *Sym) const {
+  const MCExpr *Expr =
+    MCSymbolRefExpr::create(Sym, MCSymbolRefExpr::VK_DTPREL, getContext());
+  return MCBinaryExpr::createAdd(Expr,
+                                 MCConstantExpr::create(0x8000, getContext()),
+                                 getContext());
+}
+