1 //===-- PPCMCTargetDesc.cpp - PowerPC Target Descriptions -----------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file provides PowerPC specific target descriptions.
12 //===----------------------------------------------------------------------===//
14 #include "PPCMCTargetDesc.h"
15 #include "InstPrinter/PPCInstPrinter.h"
16 #include "PPCMCAsmInfo.h"
17 #include "PPCTargetStreamer.h"
18 #include "llvm/MC/MCCodeGenInfo.h"
19 #include "llvm/MC/MCContext.h"
20 #include "llvm/MC/MCELFStreamer.h"
21 #include "llvm/MC/MCExpr.h"
22 #include "llvm/MC/MCInstrInfo.h"
23 #include "llvm/MC/MCRegisterInfo.h"
24 #include "llvm/MC/MCStreamer.h"
25 #include "llvm/MC/MCSubtargetInfo.h"
26 #include "llvm/MC/MCSymbolELF.h"
27 #include "llvm/MC/MachineLocation.h"
28 #include "llvm/Support/ELF.h"
29 #include "llvm/Support/ErrorHandling.h"
30 #include "llvm/Support/FormattedStream.h"
31 #include "llvm/Support/TargetRegistry.h"
35 #define GET_INSTRINFO_MC_DESC
36 #include "PPCGenInstrInfo.inc"
38 #define GET_SUBTARGETINFO_MC_DESC
39 #include "PPCGenSubtargetInfo.inc"
41 #define GET_REGINFO_MC_DESC
42 #include "PPCGenRegisterInfo.inc"
44 // Pin the vtable to this file.
45 PPCTargetStreamer::~PPCTargetStreamer() {}
46 PPCTargetStreamer::PPCTargetStreamer(MCStreamer &S) : MCTargetStreamer(S) {}
48 static MCInstrInfo *createPPCMCInstrInfo() {
49 MCInstrInfo *X = new MCInstrInfo();
50 InitPPCMCInstrInfo(X);
54 static MCRegisterInfo *createPPCMCRegisterInfo(const TargetTuple &TT) {
55 bool isPPC64 = (TT.getArch() == TargetTuple::ppc64 ||
56 TT.getArch() == TargetTuple::ppc64le);
57 unsigned Flavour = isPPC64 ? 0 : 1;
58 unsigned RA = isPPC64 ? PPC::LR8 : PPC::LR;
60 MCRegisterInfo *X = new MCRegisterInfo();
61 InitPPCMCRegisterInfo(X, RA, Flavour, Flavour);
65 static MCSubtargetInfo *createPPCMCSubtargetInfo(const TargetTuple &TT,
66 StringRef CPU, StringRef FS) {
67 return createPPCMCSubtargetInfoImpl(TT, CPU, FS);
70 static MCAsmInfo *createPPCMCAsmInfo(const MCRegisterInfo &MRI,
71 const TargetTuple &TT) {
72 bool isPPC64 = (TT.getArch() == TargetTuple::ppc64 ||
73 TT.getArch() == TargetTuple::ppc64le);
77 MAI = new PPCMCAsmInfoDarwin(isPPC64, TT);
79 MAI = new PPCELFMCAsmInfo(isPPC64, TT);
81 // Initial state of the frame pointer is R1.
82 unsigned Reg = isPPC64 ? PPC::X1 : PPC::R1;
83 MCCFIInstruction Inst =
84 MCCFIInstruction::createDefCfa(nullptr, MRI.getDwarfRegNum(Reg, true), 0);
85 MAI->addInitialFrameState(Inst);
90 static MCCodeGenInfo *createPPCMCCodeGenInfo(const TargetTuple &TT,
93 CodeGenOpt::Level OL) {
94 MCCodeGenInfo *X = new MCCodeGenInfo();
96 if (RM == Reloc::Default) {
98 RM = Reloc::DynamicNoPIC;
102 if (CM == CodeModel::Default) {
103 if (!TT.isOSDarwin() && (TT.getArch() == TargetTuple::ppc64 ||
104 TT.getArch() == TargetTuple::ppc64le))
105 CM = CodeModel::Medium;
107 X->initMCCodeGenInfo(RM, CM, OL);
112 class PPCTargetAsmStreamer : public PPCTargetStreamer {
113 formatted_raw_ostream &OS;
116 PPCTargetAsmStreamer(MCStreamer &S, formatted_raw_ostream &OS)
117 : PPCTargetStreamer(S), OS(OS) {}
118 void emitTCEntry(const MCSymbol &S) override {
125 void emitMachine(StringRef CPU) override {
126 OS << "\t.machine " << CPU << '\n';
128 void emitAbiVersion(int AbiVersion) override {
129 OS << "\t.abiversion " << AbiVersion << '\n';
131 void emitLocalEntry(MCSymbolELF *S, const MCExpr *LocalOffset) override {
132 const MCAsmInfo *MAI = Streamer.getContext().getAsmInfo();
134 OS << "\t.localentry\t";
137 LocalOffset->print(OS, MAI);
142 class PPCTargetELFStreamer : public PPCTargetStreamer {
144 PPCTargetELFStreamer(MCStreamer &S) : PPCTargetStreamer(S) {}
145 MCELFStreamer &getStreamer() {
146 return static_cast<MCELFStreamer &>(Streamer);
148 void emitTCEntry(const MCSymbol &S) override {
149 // Creates a R_PPC64_TOC relocation
150 Streamer.EmitValueToAlignment(8);
151 Streamer.EmitSymbolValue(&S, 8);
153 void emitMachine(StringRef CPU) override {
154 // FIXME: Is there anything to do in here or does this directive only
157 void emitAbiVersion(int AbiVersion) override {
158 MCAssembler &MCA = getStreamer().getAssembler();
159 unsigned Flags = MCA.getELFHeaderEFlags();
160 Flags &= ~ELF::EF_PPC64_ABI;
161 Flags |= (AbiVersion & ELF::EF_PPC64_ABI);
162 MCA.setELFHeaderEFlags(Flags);
164 void emitLocalEntry(MCSymbolELF *S, const MCExpr *LocalOffset) override {
165 MCAssembler &MCA = getStreamer().getAssembler();
168 if (!LocalOffset->evaluateAsAbsolute(Res, MCA))
169 report_fatal_error(".localentry expression must be absolute.");
171 unsigned Encoded = ELF::encodePPC64LocalEntryOffset(Res);
172 if (Res != ELF::decodePPC64LocalEntryOffset(Encoded))
173 report_fatal_error(".localentry expression cannot be encoded.");
175 unsigned Other = S->getOther();
176 Other &= ~ELF::STO_PPC64_LOCAL_MASK;
180 // For GAS compatibility, unless we already saw a .abiversion directive,
181 // set e_flags to indicate ELFv2 ABI.
182 unsigned Flags = MCA.getELFHeaderEFlags();
183 if ((Flags & ELF::EF_PPC64_ABI) == 0)
184 MCA.setELFHeaderEFlags(Flags | 2);
186 void emitAssignment(MCSymbol *S, const MCExpr *Value) override {
187 auto *Symbol = cast<MCSymbolELF>(S);
188 // When encoding an assignment to set symbol A to symbol B, also copy
189 // the st_other bits encoding the local entry point offset.
190 if (Value->getKind() != MCExpr::SymbolRef)
192 const auto &RhsSym = cast<MCSymbolELF>(
193 static_cast<const MCSymbolRefExpr *>(Value)->getSymbol());
194 unsigned Other = Symbol->getOther();
195 Other &= ~ELF::STO_PPC64_LOCAL_MASK;
196 Other |= RhsSym.getOther() & ELF::STO_PPC64_LOCAL_MASK;
197 Symbol->setOther(Other);
201 class PPCTargetMachOStreamer : public PPCTargetStreamer {
203 PPCTargetMachOStreamer(MCStreamer &S) : PPCTargetStreamer(S) {}
204 void emitTCEntry(const MCSymbol &S) override {
205 llvm_unreachable("Unknown pseudo-op: .tc");
207 void emitMachine(StringRef CPU) override {
208 // FIXME: We should update the CPUType, CPUSubType in the Object file if
209 // the new values are different from the defaults.
211 void emitAbiVersion(int AbiVersion) override {
212 llvm_unreachable("Unknown pseudo-op: .abiversion");
214 void emitLocalEntry(MCSymbolELF *S, const MCExpr *LocalOffset) override {
215 llvm_unreachable("Unknown pseudo-op: .localentry");
220 static MCTargetStreamer *createAsmTargetStreamer(MCStreamer &S,
221 formatted_raw_ostream &OS,
222 MCInstPrinter *InstPrint,
224 return new PPCTargetAsmStreamer(S, OS);
227 static MCTargetStreamer *
228 createObjectTargetStreamer(MCStreamer &S, const MCSubtargetInfo &STI) {
229 const TargetTuple &TT = STI.getTargetTuple();
230 if (TT.isOSBinFormatELF())
231 return new PPCTargetELFStreamer(S);
232 return new PPCTargetMachOStreamer(S);
235 static MCInstPrinter *createPPCMCInstPrinter(const TargetTuple &TT,
236 unsigned SyntaxVariant,
237 const MCAsmInfo &MAI,
238 const MCInstrInfo &MII,
239 const MCRegisterInfo &MRI) {
240 return new PPCInstPrinter(MAI, MII, MRI, TT.isOSDarwin());
243 extern "C" void LLVMInitializePowerPCTargetMC() {
244 for (Target *T : {&ThePPC32Target, &ThePPC64Target, &ThePPC64LETarget}) {
245 // Register the MC asm info.
246 RegisterMCAsmInfoFn C(*T, createPPCMCAsmInfo);
248 // Register the MC codegen info.
249 TargetRegistry::RegisterMCCodeGenInfo(*T, createPPCMCCodeGenInfo);
251 // Register the MC instruction info.
252 TargetRegistry::RegisterMCInstrInfo(*T, createPPCMCInstrInfo);
254 // Register the MC register info.
255 TargetRegistry::RegisterMCRegInfo(*T, createPPCMCRegisterInfo);
257 // Register the MC subtarget info.
258 TargetRegistry::RegisterMCSubtargetInfo(*T, createPPCMCSubtargetInfo);
260 // Register the MC Code Emitter
261 TargetRegistry::RegisterMCCodeEmitter(*T, createPPCMCCodeEmitter);
263 // Register the asm backend.
264 TargetRegistry::RegisterMCAsmBackend(*T, createPPCAsmBackend);
266 // Register the object target streamer.
267 TargetRegistry::RegisterObjectTargetStreamer(*T,
268 createObjectTargetStreamer);
270 // Register the asm target streamer.
271 TargetRegistry::RegisterAsmTargetStreamer(*T, createAsmTargetStreamer);
273 // Register the MCInstPrinter.
274 TargetRegistry::RegisterMCInstPrinter(*T, createPPCMCInstPrinter);