1 files changed, 39 insertions, 0 deletions
diff --git a/lib/Target/BPF/BPFFrameLowering.cpp b/lib/Target/BPF/BPFFrameLowering.cpp
new file mode 100644
index 0000000..ae9f355
--- /dev/null
+++ b/lib/Target/BPF/BPFFrameLowering.cpp
@@ -0,0 +1,39 @@
+//===-- BPFFrameLowering.cpp - BPF Frame Information ----------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file contains the BPF implementation of TargetFrameLowering class.
+//
+//===----------------------------------------------------------------------===//
+
+#include "BPFFrameLowering.h"
+#include "BPFInstrInfo.h"
+#include "BPFSubtarget.h"
+#include "llvm/CodeGen/MachineFrameInfo.h"
+#include "llvm/CodeGen/MachineFunction.h"
+#include "llvm/CodeGen/MachineInstrBuilder.h"
+#include "llvm/CodeGen/MachineRegisterInfo.h"
+
+using namespace llvm;
+
+bool BPFFrameLowering::hasFP(const MachineFunction &MF) const { return true; }
+
+void BPFFrameLowering::emitPrologue(MachineFunction &MF) const {}
+
+void BPFFrameLowering::emitEpilogue(MachineFunction &MF,
+                                    MachineBasicBlock &MBB) const {}
+
+void BPFFrameLowering::processFunctionBeforeCalleeSavedScan(
+    MachineFunction &MF, RegScavenger *RS) const {
+  MachineRegisterInfo &MRI = MF.getRegInfo();
+
+  MRI.setPhysRegUnused(BPF::R6);
+  MRI.setPhysRegUnused(BPF::R7);
+  MRI.setPhysRegUnused(BPF::R8);
+  MRI.setPhysRegUnused(BPF::R9);
+}