Support: add Windows ARM EH data structures

[oota-llvm.git] / lib / Support / ARMWinEH.cpp

diff --git a/lib/Support/ARMWinEH.cpp b/lib/Support/ARMWinEH.cpp
new file mode 100644 (file)
index 0000000..03c150f
--- /dev/null
+++ b/lib/Support/ARMWinEH.cpp
@@ -0,0 +1,38 @@
+//===-- ARMWinEH.cpp - Windows on ARM EH Support Functions ------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Support/ARMWinEH.h"
+#include "llvm/Support/raw_ostream.h"
+
+namespace llvm {
+namespace ARM {
+namespace WinEH {
+std::pair<uint16_t, uint32_t> SavedRegisterMask(const RuntimeFunction &RF) {
+  uint8_t NumRegisters = RF.Reg();
+  uint8_t RegistersVFP = RF.R();
+  uint8_t LinkRegister = RF.L();
+  uint8_t ChainedFrame = RF.C();
+
+  uint16_t GPRMask = (ChainedFrame << 11) | (LinkRegister << 14);
+  uint32_t VFPMask = 0;
+
+  if (RegistersVFP)
+    VFPMask |= (((1 << ((NumRegisters + 1) % 8)) - 1) << 8);
+  else
+    GPRMask |= (((1 << (NumRegisters + 1)) - 1) << 4);
+
+  if (PrologueFolding(RF))
+    GPRMask |= (((1 << (NumRegisters + 1)) - 1) << (~RF.StackAdjust() & 0x3));
+
+  return std::make_pair(GPRMask, VFPMask);
+}
+}
+}
+}
+