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(StringRef TT) {
56 bool isPPC64 = (TheTriple.getArch() == Triple::ppc64 ||
57 TheTriple.getArch() == Triple::ppc64le);
58 unsigned Flavour = isPPC64 ? 0 : 1;
59 unsigned RA = isPPC64 ? PPC::LR8 : PPC::LR;
61 MCRegisterInfo *X = new MCRegisterInfo();
62 InitPPCMCRegisterInfo(X, RA, Flavour, Flavour);
66 static MCSubtargetInfo *createPPCMCSubtargetInfo(const Triple &TT,
67 StringRef CPU, StringRef FS) {
68 MCSubtargetInfo *X = new MCSubtargetInfo();
69 InitPPCMCSubtargetInfo(X, TT, CPU, FS);
73 static MCAsmInfo *createPPCMCAsmInfo(const MCRegisterInfo &MRI,
74 const Triple &TheTriple) {
75 bool isPPC64 = (TheTriple.getArch() == Triple::ppc64 ||
76 TheTriple.getArch() == Triple::ppc64le);
79 if (TheTriple.isOSDarwin())
80 MAI = new PPCMCAsmInfoDarwin(isPPC64, TheTriple);
82 MAI = new PPCELFMCAsmInfo(isPPC64, TheTriple);
84 // Initial state of the frame pointer is R1.
85 unsigned Reg = isPPC64 ? PPC::X1 : PPC::R1;
86 MCCFIInstruction Inst =
87 MCCFIInstruction::createDefCfa(nullptr, MRI.getDwarfRegNum(Reg, true), 0);
88 MAI->addInitialFrameState(Inst);
93 static MCCodeGenInfo *createPPCMCCodeGenInfo(StringRef TT, Reloc::Model RM,
95 CodeGenOpt::Level OL) {
96 MCCodeGenInfo *X = new MCCodeGenInfo();
98 if (RM == Reloc::Default) {
101 RM = Reloc::DynamicNoPIC;
105 if (CM == CodeModel::Default) {
107 if (!T.isOSDarwin() &&
108 (T.getArch() == Triple::ppc64 || T.getArch() == Triple::ppc64le))
109 CM = CodeModel::Medium;
111 X->initMCCodeGenInfo(RM, CM, OL);
116 class PPCTargetAsmStreamer : public PPCTargetStreamer {
117 formatted_raw_ostream &OS;
120 PPCTargetAsmStreamer(MCStreamer &S, formatted_raw_ostream &OS)
121 : PPCTargetStreamer(S), OS(OS) {}
122 void emitTCEntry(const MCSymbol &S) override {
129 void emitMachine(StringRef CPU) override {
130 OS << "\t.machine " << CPU << '\n';
132 void emitAbiVersion(int AbiVersion) override {
133 OS << "\t.abiversion " << AbiVersion << '\n';
135 void emitLocalEntry(MCSymbolELF *S, const MCExpr *LocalOffset) override {
136 const MCAsmInfo *MAI = Streamer.getContext().getAsmInfo();
138 OS << "\t.localentry\t";
141 LocalOffset->print(OS, MAI);
146 class PPCTargetELFStreamer : public PPCTargetStreamer {
148 PPCTargetELFStreamer(MCStreamer &S) : PPCTargetStreamer(S) {}
149 MCELFStreamer &getStreamer() {
150 return static_cast<MCELFStreamer &>(Streamer);
152 void emitTCEntry(const MCSymbol &S) override {
153 // Creates a R_PPC64_TOC relocation
154 Streamer.EmitValueToAlignment(8);
155 Streamer.EmitSymbolValue(&S, 8);
157 void emitMachine(StringRef CPU) override {
158 // FIXME: Is there anything to do in here or does this directive only
161 void emitAbiVersion(int AbiVersion) override {
162 MCAssembler &MCA = getStreamer().getAssembler();
163 unsigned Flags = MCA.getELFHeaderEFlags();
164 Flags &= ~ELF::EF_PPC64_ABI;
165 Flags |= (AbiVersion & ELF::EF_PPC64_ABI);
166 MCA.setELFHeaderEFlags(Flags);
168 void emitLocalEntry(MCSymbolELF *S, const MCExpr *LocalOffset) override {
169 MCAssembler &MCA = getStreamer().getAssembler();
172 if (!LocalOffset->evaluateAsAbsolute(Res, MCA))
173 report_fatal_error(".localentry expression must be absolute.");
175 unsigned Encoded = ELF::encodePPC64LocalEntryOffset(Res);
176 if (Res != ELF::decodePPC64LocalEntryOffset(Encoded))
177 report_fatal_error(".localentry expression cannot be encoded.");
179 unsigned Other = S->getOther();
180 Other &= ~ELF::STO_PPC64_LOCAL_MASK;
184 // For GAS compatibility, unless we already saw a .abiversion directive,
185 // set e_flags to indicate ELFv2 ABI.
186 unsigned Flags = MCA.getELFHeaderEFlags();
187 if ((Flags & ELF::EF_PPC64_ABI) == 0)
188 MCA.setELFHeaderEFlags(Flags | 2);
190 void emitAssignment(MCSymbol *S, const MCExpr *Value) override {
191 auto *Symbol = cast<MCSymbolELF>(S);
192 // When encoding an assignment to set symbol A to symbol B, also copy
193 // the st_other bits encoding the local entry point offset.
194 if (Value->getKind() != MCExpr::SymbolRef)
196 const auto &RhsSym = cast<MCSymbolELF>(
197 static_cast<const MCSymbolRefExpr *>(Value)->getSymbol());
198 unsigned Other = Symbol->getOther();
199 Other &= ~ELF::STO_PPC64_LOCAL_MASK;
200 Other |= RhsSym.getOther() & ELF::STO_PPC64_LOCAL_MASK;
201 Symbol->setOther(Other);
205 class PPCTargetMachOStreamer : public PPCTargetStreamer {
207 PPCTargetMachOStreamer(MCStreamer &S) : PPCTargetStreamer(S) {}
208 void emitTCEntry(const MCSymbol &S) override {
209 llvm_unreachable("Unknown pseudo-op: .tc");
211 void emitMachine(StringRef CPU) override {
212 // FIXME: We should update the CPUType, CPUSubType in the Object file if
213 // the new values are different from the defaults.
215 void emitAbiVersion(int AbiVersion) override {
216 llvm_unreachable("Unknown pseudo-op: .abiversion");
218 void emitLocalEntry(MCSymbolELF *S, const MCExpr *LocalOffset) override {
219 llvm_unreachable("Unknown pseudo-op: .localentry");
224 static MCTargetStreamer *createAsmTargetStreamer(MCStreamer &S,
225 formatted_raw_ostream &OS,
226 MCInstPrinter *InstPrint,
228 return new PPCTargetAsmStreamer(S, OS);
231 static MCTargetStreamer *
232 createObjectTargetStreamer(MCStreamer &S, const MCSubtargetInfo &STI) {
233 const Triple &TT = STI.getTargetTriple();
234 if (TT.getObjectFormat() == Triple::ELF)
235 return new PPCTargetELFStreamer(S);
236 return new PPCTargetMachOStreamer(S);
239 static MCInstPrinter *createPPCMCInstPrinter(const Triple &T,
240 unsigned SyntaxVariant,
241 const MCAsmInfo &MAI,
242 const MCInstrInfo &MII,
243 const MCRegisterInfo &MRI) {
244 return new PPCInstPrinter(MAI, MII, MRI, T.isOSDarwin());
247 extern "C" void LLVMInitializePowerPCTargetMC() {
248 for (Target *T : {&ThePPC32Target, &ThePPC64Target, &ThePPC64LETarget}) {
249 // Register the MC asm info.
250 RegisterMCAsmInfoFn C(*T, createPPCMCAsmInfo);
252 // Register the MC codegen info.
253 TargetRegistry::RegisterMCCodeGenInfo(*T, createPPCMCCodeGenInfo);
255 // Register the MC instruction info.
256 TargetRegistry::RegisterMCInstrInfo(*T, createPPCMCInstrInfo);
258 // Register the MC register info.
259 TargetRegistry::RegisterMCRegInfo(*T, createPPCMCRegisterInfo);
261 // Register the MC subtarget info.
262 TargetRegistry::RegisterMCSubtargetInfo(*T, createPPCMCSubtargetInfo);
264 // Register the MC Code Emitter
265 TargetRegistry::RegisterMCCodeEmitter(*T, createPPCMCCodeEmitter);
267 // Register the asm backend.
268 TargetRegistry::RegisterMCAsmBackend(*T, createPPCAsmBackend);
270 // Register the object target streamer.
271 TargetRegistry::RegisterObjectTargetStreamer(*T,
272 createObjectTargetStreamer);
274 // Register the asm target streamer.
275 TargetRegistry::RegisterAsmTargetStreamer(*T, createAsmTargetStreamer);
277 // Register the MCInstPrinter.
278 TargetRegistry::RegisterMCInstPrinter(*T, createPPCMCInstPrinter);