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