lib/Support/ARMWinEH.cpp

   1 //===-- ARMWinEH.cpp - Windows on ARM EH Support Functions ------*- C++ -*-===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9
  10 #include "llvm/Support/ARMWinEH.h"
  11 #include "llvm/Support/raw_ostream.h"
  12
  13 namespace llvm {
  14 namespace ARM {
  15 namespace WinEH {
  16 std::pair<uint16_t, uint32_t> SavedRegisterMask(const RuntimeFunction &RF) {
  17   uint8_t NumRegisters = RF.Reg();
  18   uint8_t RegistersVFP = RF.R();
  19   uint8_t LinkRegister = RF.L();
  20   uint8_t ChainedFrame = RF.C();
  21
  22   uint16_t GPRMask = (ChainedFrame << 11) | (LinkRegister << 14);
  23   uint32_t VFPMask = 0;
  24
  25   if (RegistersVFP)
  26     VFPMask |= (((1 << ((NumRegisters + 1) % 8)) - 1) << 8);
  27   else
  28     GPRMask |= (((1 << (NumRegisters + 1)) - 1) << 4);
  29
  30   if (PrologueFolding(RF))
  31     GPRMask |= (((1 << (NumRegisters + 1)) - 1) << (~RF.StackAdjust() & 0x3));
  32
  33   return std::make_pair(GPRMask, VFPMask);
  34 }
  35 }
  36 }
  37 }
  38