1//=== HexagonMCELFStreamer.cpp - Hexagon subclass of MCELFStreamer -------===//
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// This file is a stub that parses a MCInst bundle and passes the
10// instructions on to the real streamer.
11//
12//===----------------------------------------------------------------------===//
13
14#include "MCTargetDesc/HexagonMCELFStreamer.h"
15#include "HexagonTargetStreamer.h"
16#include "MCTargetDesc/HexagonMCChecker.h"
17#include "MCTargetDesc/HexagonMCInstrInfo.h"
18#include "MCTargetDesc/HexagonMCShuffler.h"
19#include "llvm/ADT/StringRef.h"
20#include "llvm/BinaryFormat/ELF.h"
21#include "llvm/MC/MCAsmBackend.h"
22#include "llvm/MC/MCAssembler.h"
23#include "llvm/MC/MCCodeEmitter.h"
24#include "llvm/MC/MCContext.h"
25#include "llvm/MC/MCExpr.h"
26#include "llvm/MC/MCInst.h"
27#include "llvm/MC/MCObjectStreamer.h"
28#include "llvm/MC/MCObjectWriter.h"
29#include "llvm/MC/MCSection.h"
30#include "llvm/MC/MCSectionELF.h"
31#include "llvm/MC/MCStreamer.h"
32#include "llvm/MC/MCSubtargetInfo.h"
33#include "llvm/MC/MCSymbol.h"
34#include "llvm/MC/MCSymbolELF.h"
35#include "llvm/Support/Casting.h"
36#include "llvm/Support/CommandLine.h"
37#include "llvm/Support/ErrorHandling.h"
38#include "llvm/Support/HexagonAttributes.h"
39#include "llvm/Support/MathExtras.h"
40#include <cassert>
41#include <cstdint>
42
43#define DEBUG_TYPE "hexagonmcelfstreamer"
44
45using namespace llvm;
46
47static cl::opt<unsigned> GPSize
48 ("gpsize", cl::NotHidden,
49 cl::desc("Global Pointer Addressing Size. The default size is 8."),
50 cl::Prefix,
51 cl::init(Val: 8));
52
53HexagonMCELFStreamer::HexagonMCELFStreamer(
54 MCContext &Context, std::unique_ptr<MCAsmBackend> TAB,
55 std::unique_ptr<MCObjectWriter> OW, std::unique_ptr<MCCodeEmitter> Emitter)
56 : MCELFStreamer(Context, std::move(TAB), std::move(OW), std::move(Emitter)),
57 MCII(createHexagonMCInstrInfo()) {}
58
59HexagonMCELFStreamer::HexagonMCELFStreamer(
60 MCContext &Context, std::unique_ptr<MCAsmBackend> TAB,
61 std::unique_ptr<MCObjectWriter> OW, std::unique_ptr<MCCodeEmitter> Emitter,
62 MCAssembler *Assembler)
63 : MCELFStreamer(Context, std::move(TAB), std::move(OW), std::move(Emitter)),
64 MCII(createHexagonMCInstrInfo()) {}
65
66void HexagonMCELFStreamer::emitInstruction(const MCInst &MCB,
67 const MCSubtargetInfo &STI) {
68 assert(MCB.getOpcode() == Hexagon::BUNDLE);
69 assert(HexagonMCInstrInfo::bundleSize(MCB) <= HEXAGON_PACKET_SIZE);
70 assert(HexagonMCInstrInfo::bundleSize(MCB) > 0);
71
72 // At this point, MCB is a bundle
73 // Iterate through the bundle and assign addends for the instructions
74 for (auto const &I : HexagonMCInstrInfo::bundleInstructions(MCI: MCB)) {
75 MCInst *MCI = const_cast<MCInst *>(I.getInst());
76 EmitSymbol(Inst: *MCI);
77 }
78
79 MCObjectStreamer::emitInstruction(Inst: MCB, STI);
80}
81
82void HexagonMCELFStreamer::EmitSymbol(const MCInst &Inst) {
83 // Scan for values.
84 for (unsigned i = Inst.getNumOperands(); i--;)
85 if (Inst.getOperand(i).isExpr())
86 visitUsedExpr(Expr: *Inst.getOperand(i).getExpr());
87}
88
89// EmitCommonSymbol and EmitLocalCommonSymbol are extended versions of the
90// functions found in MCELFStreamer.cpp taking AccessSize as an additional
91// parameter.
92void HexagonMCELFStreamer::HexagonMCEmitCommonSymbol(MCSymbol *Symbol,
93 uint64_t Size,
94 Align ByteAlignment,
95 unsigned AccessSize) {
96 getAssembler().registerSymbol(Symbol: *Symbol);
97 StringRef sbss[4] = {".sbss.1", ".sbss.2", ".sbss.4", ".sbss.8"};
98
99 auto ELFSymbol = cast<MCSymbolELF>(Val: Symbol);
100 if (!ELFSymbol->isBindingSet())
101 ELFSymbol->setBinding(ELF::STB_GLOBAL);
102
103 ELFSymbol->setType(ELF::STT_OBJECT);
104
105 if (ELFSymbol->getBinding() == ELF::STB_LOCAL) {
106 StringRef SectionName =
107 ((AccessSize == 0) || (Size == 0) || (Size > GPSize))
108 ? ".bss"
109 : sbss[(Log2_64(Value: AccessSize))];
110 MCSection &Section = *getAssembler().getContext().getELFSection(
111 Section: SectionName, Type: ELF::SHT_NOBITS, Flags: ELF::SHF_WRITE | ELF::SHF_ALLOC);
112 MCSectionSubPair P = getCurrentSection();
113 switchSection(Section: &Section);
114
115 if (ELFSymbol->isUndefined()) {
116 emitValueToAlignment(ByteAlignment, 0, 1, 0);
117 emitLabel(Symbol);
118 emitZeros(NumBytes: Size);
119 }
120
121 // Update the maximum alignment of the section if necessary.
122 Section.ensureMinAlignment(MinAlignment: ByteAlignment);
123
124 switchSection(Section: P.first, Subsec: P.second);
125 } else {
126 if (ELFSymbol->declareCommon(Size, Alignment: ByteAlignment))
127 report_fatal_error(reason: "Symbol: " + Symbol->getName() +
128 " redeclared as different type");
129 if ((AccessSize) && (Size <= GPSize)) {
130 uint64_t SectionIndex =
131 (AccessSize <= GPSize)
132 ? ELF::SHN_HEXAGON_SCOMMON + llvm::bit_width(Value: AccessSize)
133 : (unsigned)ELF::SHN_HEXAGON_SCOMMON;
134 ELFSymbol->setIndex(SectionIndex);
135 }
136 }
137
138 ELFSymbol->setSize(MCConstantExpr::create(Value: Size, Ctx&: getContext()));
139}
140
141void HexagonMCELFStreamer::HexagonMCEmitLocalCommonSymbol(MCSymbol *Symbol,
142 uint64_t Size,
143 Align ByteAlignment,
144 unsigned AccessSize) {
145 getAssembler().registerSymbol(Symbol: *Symbol);
146 auto ELFSymbol = cast<MCSymbolELF>(Val: Symbol);
147 ELFSymbol->setBinding(ELF::STB_LOCAL);
148 ELFSymbol->setExternal(false);
149 HexagonMCEmitCommonSymbol(Symbol, Size, ByteAlignment, AccessSize);
150}
151
152static unsigned featureToArchVersion(unsigned Feature) {
153 switch (Feature) {
154 case Hexagon::ArchV5:
155 return 5;
156 case Hexagon::ArchV55:
157 return 55;
158 case Hexagon::ArchV60:
159 case Hexagon::ExtensionHVXV60:
160 return 60;
161 case Hexagon::ArchV62:
162 case Hexagon::ExtensionHVXV62:
163 return 62;
164 case Hexagon::ArchV65:
165 case Hexagon::ExtensionHVXV65:
166 return 65;
167 case Hexagon::ArchV66:
168 case Hexagon::ExtensionHVXV66:
169 return 66;
170 case Hexagon::ArchV67:
171 case Hexagon::ExtensionHVXV67:
172 return 67;
173 case Hexagon::ArchV68:
174 case Hexagon::ExtensionHVXV68:
175 return 68;
176 case Hexagon::ArchV69:
177 case Hexagon::ExtensionHVXV69:
178 return 69;
179 case Hexagon::ArchV71:
180 case Hexagon::ExtensionHVXV71:
181 return 71;
182 case Hexagon::ArchV73:
183 case Hexagon::ExtensionHVXV73:
184 return 73;
185 case Hexagon::ArchV75:
186 case Hexagon::ExtensionHVXV75:
187 return 75;
188 case Hexagon::ArchV79:
189 case Hexagon::ExtensionHVXV79:
190 return 79;
191 }
192 llvm_unreachable("Expected valid arch feature");
193 return 0;
194}
195
196void HexagonTargetStreamer::emitTargetAttributes(const MCSubtargetInfo &STI) {
197 auto Features = STI.getFeatureBits();
198 unsigned Arch = featureToArchVersion(Feature: Hexagon_MC::getArchVersion(Features));
199 std::optional<unsigned> HVXArch = Hexagon_MC::getHVXVersion(Features);
200 emitAttribute(Attribute: HexagonAttrs::ARCH, Value: Arch);
201 if (HVXArch)
202 emitAttribute(Attribute: HexagonAttrs::HVXARCH, Value: featureToArchVersion(Feature: *HVXArch));
203 if (Features.test(I: Hexagon::ExtensionHVXIEEEFP))
204 emitAttribute(Attribute: HexagonAttrs::HVXIEEEFP, Value: 1);
205 if (Features.test(I: Hexagon::ExtensionHVXQFloat))
206 emitAttribute(Attribute: HexagonAttrs::HVXQFLOAT, Value: 1);
207 if (Features.test(I: Hexagon::ExtensionZReg))
208 emitAttribute(Attribute: HexagonAttrs::ZREG, Value: 1);
209 if (Features.test(I: Hexagon::ExtensionAudio))
210 emitAttribute(Attribute: HexagonAttrs::AUDIO, Value: 1);
211 if (Features.test(I: Hexagon::FeatureCabac))
212 emitAttribute(Attribute: HexagonAttrs::CABAC, Value: 1);
213}
214
215namespace llvm {
216MCStreamer *createHexagonELFStreamer(Triple const &TT, MCContext &Context,
217 std::unique_ptr<MCAsmBackend> MAB,
218 std::unique_ptr<MCObjectWriter> OW,
219 std::unique_ptr<MCCodeEmitter> CE) {
220 return new HexagonMCELFStreamer(Context, std::move(MAB), std::move(OW),
221 std::move(CE));
222 }
223
224} // end namespace llvm
225