84 lines · cpp
1//===-- AVRTargetObjectFile.cpp - AVR Object Files ------------------------===//2//3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.4// See https://llvm.org/LICENSE.txt for license information.5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception6//7//===----------------------------------------------------------------------===//8 9#include "AVRTargetObjectFile.h"10#include "AVRTargetMachine.h"11 12#include "llvm/BinaryFormat/ELF.h"13#include "llvm/IR/GlobalValue.h"14#include "llvm/IR/Mangler.h"15#include "llvm/MC/MCContext.h"16#include "llvm/MC/MCSectionELF.h"17 18#include "AVR.h"19 20namespace llvm {21void AVRTargetObjectFile::Initialize(MCContext &Ctx, const TargetMachine &TM) {22 Base::Initialize(Ctx, TM);23 ProgmemDataSection =24 Ctx.getELFSection(".progmem.data", ELF::SHT_PROGBITS, ELF::SHF_ALLOC);25 Progmem1DataSection =26 Ctx.getELFSection(".progmem1.data", ELF::SHT_PROGBITS, ELF::SHF_ALLOC);27 Progmem2DataSection =28 Ctx.getELFSection(".progmem2.data", ELF::SHT_PROGBITS, ELF::SHF_ALLOC);29 Progmem3DataSection =30 Ctx.getELFSection(".progmem3.data", ELF::SHT_PROGBITS, ELF::SHF_ALLOC);31 Progmem4DataSection =32 Ctx.getELFSection(".progmem4.data", ELF::SHT_PROGBITS, ELF::SHF_ALLOC);33 Progmem5DataSection =34 Ctx.getELFSection(".progmem5.data", ELF::SHT_PROGBITS, ELF::SHF_ALLOC);35}36 37MCSection *AVRTargetObjectFile::SelectSectionForGlobal(38 const GlobalObject *GO, SectionKind Kind, const TargetMachine &TM) const {39 // Global values in flash memory are placed in the progmem*.data section40 // unless they already have a user assigned section.41 const auto &AVRTM = static_cast<const AVRTargetMachine &>(TM);42 if (AVR::isProgramMemoryAddress(GO) && !GO->hasSection() &&43 Kind.isReadOnly()) {44 // The AVR subtarget should support LPM to access section '.progmem*.data'.45 if (!AVRTM.getSubtargetImpl()->hasLPM()) {46 // TODO: Get the global object's location in source file.47 getContext().reportError(48 SMLoc(),49 "Current AVR subtarget does not support accessing program memory");50 return Base::SelectSectionForGlobal(GO, Kind, TM);51 }52 // The AVR subtarget should support ELPM to access section53 // '.progmem[1|2|3|4|5].data'.54 if (!AVRTM.getSubtargetImpl()->hasELPM() &&55 AVR::getAddressSpace(GO) != AVR::ProgramMemory) {56 // TODO: Get the global object's location in source file.57 getContext().reportError(SMLoc(),58 "Current AVR subtarget does not support "59 "accessing extended program memory");60 return ProgmemDataSection;61 }62 switch (AVR::getAddressSpace(GO)) {63 case AVR::ProgramMemory: // address space 164 return ProgmemDataSection;65 case AVR::ProgramMemory1: // address space 266 return Progmem1DataSection;67 case AVR::ProgramMemory2: // address space 368 return Progmem2DataSection;69 case AVR::ProgramMemory3: // address space 470 return Progmem3DataSection;71 case AVR::ProgramMemory4: // address space 572 return Progmem4DataSection;73 case AVR::ProgramMemory5: // address space 674 return Progmem5DataSection;75 default:76 llvm_unreachable("unexpected program memory index");77 }78 }79 80 // Otherwise, we work the same way as ELF.81 return Base::SelectSectionForGlobal(GO, Kind, TM);82}83} // end of namespace llvm84