1 //===-- ARMWinEH.cpp - Windows on ARM EH Support Functions ------*- C++ -*-===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 
9 #include "llvm/Support/ARMWinEH.h"
10 #include "llvm/Support/raw_ostream.h"
11 
12 namespace llvm {
13 namespace ARM {
14 namespace WinEH {
SavedRegisterMask(const RuntimeFunction & RF)15 std::pair<uint16_t, uint32_t> SavedRegisterMask(const RuntimeFunction &RF) {
16   uint8_t NumRegisters = RF.Reg();
17   uint8_t RegistersVFP = RF.R();
18   uint8_t LinkRegister = RF.L();
19   uint8_t ChainedFrame = RF.C();
20 
21   uint16_t GPRMask = (ChainedFrame << 11) | (LinkRegister << 14);
22   uint32_t VFPMask = 0;
23 
24   if (RegistersVFP)
25     VFPMask |= (((1 << ((NumRegisters + 1) % 8)) - 1) << 8);
26   else
27     GPRMask |= (((1 << (NumRegisters + 1)) - 1) << 4);
28 
29   if (PrologueFolding(RF))
30     GPRMask |= (((1 << (NumRegisters + 1)) - 1) << (~RF.StackAdjust() & 0x3));
31 
32   return std::make_pair(GPRMask, VFPMask);
33 }
34 } // namespace WinEH
35 } // namespace ARM
36 } // namespace llvm
37 
38