ARMWinEH.cpp revision cd81d94322a39503e4a3e87b6ee03d4fcb3465fb 
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
13namespace llvm {
14namespace ARM {
15namespace WinEH {
16std::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