50 lines
1.6 KiB
C++
50 lines
1.6 KiB
C++
//===-- ARMWinEH.cpp - Windows on ARM EH Support Functions ------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Support/ARMWinEH.h"
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namespace llvm {
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namespace ARM {
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namespace WinEH {
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std::pair<uint16_t, uint32_t> SavedRegisterMask(const RuntimeFunction &RF,
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bool Prologue) {
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uint8_t NumRegisters = RF.Reg();
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uint8_t RegistersVFP = RF.R();
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uint8_t LinkRegister = RF.L();
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uint8_t ChainedFrame = RF.C();
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uint16_t GPRMask = (ChainedFrame << 11);
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uint32_t VFPMask = 0;
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if (Prologue) {
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GPRMask |= (LinkRegister << 14);
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} else {
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// If Ret != 0, we pop into Lr and return later
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if (RF.Ret() != ReturnType::RT_POP)
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GPRMask |= (LinkRegister << 14);
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else if (!RF.H()) // If H == 0, we pop directly into Pc
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GPRMask |= (LinkRegister << 15);
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// else, Ret == 0 && H == 1, we pop into Pc separately afterwards
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}
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if (RegistersVFP)
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VFPMask |= (((1 << ((NumRegisters + 1) % 8)) - 1) << 8);
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else
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GPRMask |= (((1 << (NumRegisters + 1)) - 1) << 4);
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if ((PrologueFolding(RF) && Prologue) || (EpilogueFolding(RF) && !Prologue))
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GPRMask |= (((1 << ((RF.StackAdjust() & 0x3) + 1)) - 1)
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<< (~RF.StackAdjust() & 0x3));
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return std::make_pair(GPRMask, VFPMask);
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}
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} // namespace WinEH
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} // namespace ARM
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} // namespace llvm
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