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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 |