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-exception
6//
7//===----------------------------------------------------------------------===//
8
9#include "AVRTargetObjectFile.h"
10#include "AVRTargetMachine.h"
11
12#include "llvm/BinaryFormat/ELF.h"
13#include "llvm/IR/DerivedTypes.h"
14#include "llvm/IR/GlobalValue.h"
15#include "llvm/IR/Mangler.h"
16#include "llvm/MC/MCContext.h"
17#include "llvm/MC/MCSectionELF.h"
18
19#include "AVR.h"
20
21namespace llvm {
22void AVRTargetObjectFile::Initialize(MCContext &Ctx, const TargetMachine &TM) {
23 Base::Initialize(Ctx, TM);
24 ProgmemDataSection =
25 Ctx.getELFSection(Section: ".progmem.data", Type: ELF::SHT_PROGBITS, Flags: ELF::SHF_ALLOC);
26 Progmem1DataSection =
27 Ctx.getELFSection(Section: ".progmem1.data", Type: ELF::SHT_PROGBITS, Flags: ELF::SHF_ALLOC);
28 Progmem2DataSection =
29 Ctx.getELFSection(Section: ".progmem2.data", Type: ELF::SHT_PROGBITS, Flags: ELF::SHF_ALLOC);
30 Progmem3DataSection =
31 Ctx.getELFSection(Section: ".progmem3.data", Type: ELF::SHT_PROGBITS, Flags: ELF::SHF_ALLOC);
32 Progmem4DataSection =
33 Ctx.getELFSection(Section: ".progmem4.data", Type: ELF::SHT_PROGBITS, Flags: ELF::SHF_ALLOC);
34 Progmem5DataSection =
35 Ctx.getELFSection(Section: ".progmem5.data", Type: ELF::SHT_PROGBITS, Flags: ELF::SHF_ALLOC);
36}
37
38MCSection *AVRTargetObjectFile::SelectSectionForGlobal(
39 const GlobalObject *GO, SectionKind Kind, const TargetMachine &TM) const {
40 // Global values in flash memory are placed in the progmem*.data section
41 // unless they already have a user assigned section.
42 const auto &AVRTM = static_cast<const AVRTargetMachine &>(TM);
43 if (AVR::isProgramMemoryAddress(V: GO) && !GO->hasSection() &&
44 Kind.isReadOnly()) {
45 // The AVR subtarget should support LPM to access section '.progmem*.data'.
46 if (!AVRTM.getSubtargetImpl()->hasLPM()) {
47 // TODO: Get the global object's location in source file.
48 getContext().reportError(
49 L: SMLoc(),
50 Msg: "Current AVR subtarget does not support accessing program memory");
51 return Base::SelectSectionForGlobal(GO, Kind, TM);
52 }
53 // The AVR subtarget should support ELPM to access section
54 // '.progmem[1|2|3|4|5].data'.
55 if (!AVRTM.getSubtargetImpl()->hasELPM() &&
56 AVR::getAddressSpace(V: GO) != AVR::ProgramMemory) {
57 // TODO: Get the global object's location in source file.
58 getContext().reportError(L: SMLoc(),
59 Msg: "Current AVR subtarget does not support "
60 "accessing extended program memory");
61 return ProgmemDataSection;
62 }
63 switch (AVR::getAddressSpace(V: GO)) {
64 case AVR::ProgramMemory: // address space 1
65 return ProgmemDataSection;
66 case AVR::ProgramMemory1: // address space 2
67 return Progmem1DataSection;
68 case AVR::ProgramMemory2: // address space 3
69 return Progmem2DataSection;
70 case AVR::ProgramMemory3: // address space 4
71 return Progmem3DataSection;
72 case AVR::ProgramMemory4: // address space 5
73 return Progmem4DataSection;
74 case AVR::ProgramMemory5: // address space 6
75 return Progmem5DataSection;
76 default:
77 llvm_unreachable("unexpected program memory index");
78 }
79 }
80
81 // Otherwise, we work the same way as ELF.
82 return Base::SelectSectionForGlobal(GO, Kind, TM);
83}
84} // end of namespace llvm
85

source code of llvm/lib/Target/AVR/AVRTargetObjectFile.cpp