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 {
SavedRegisterMask(const RuntimeFunction & RF)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 
39