xref: /freebsd/contrib/llvm-project/llvm/lib/Support/ARMWinEH.cpp (revision 38a52bd3b5cac3da6f7f6eef3dd050e6aa08ebb3)
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 
11 namespace llvm {
12 namespace ARM {
13 namespace WinEH {
14 std::pair<uint16_t, uint32_t> SavedRegisterMask(const RuntimeFunction &RF) {
15   uint8_t NumRegisters = RF.Reg();
16   uint8_t RegistersVFP = RF.R();
17   uint8_t LinkRegister = RF.L();
18   uint8_t ChainedFrame = RF.C();
19 
20   uint16_t GPRMask = (ChainedFrame << 11) | (LinkRegister << 14);
21   uint32_t VFPMask = 0;
22 
23   if (RegistersVFP)
24     VFPMask |= (((1 << ((NumRegisters + 1) % 8)) - 1) << 8);
25   else
26     GPRMask |= (((1 << (NumRegisters + 1)) - 1) << 4);
27 
28   if (PrologueFolding(RF))
29     GPRMask |= (((1 << (NumRegisters + 1)) - 1) << (~RF.StackAdjust() & 0x3));
30 
31   return std::make_pair(GPRMask, VFPMask);
32 }
33 } // namespace WinEH
34 } // namespace ARM
35 } // namespace llvm
36 
37