1 //===-- PPCAsmPrinter.cpp - Print machine instrs to PowerPC assembly ------===//
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 contains a printer that converts from our internal representation
11 // of machine-dependent LLVM code to PowerPC assembly language. This printer is
12 // the output mechanism used by `llc'.
14 // Documentation at http://developer.apple.com/documentation/DeveloperTools/
15 // Reference/Assembler/ASMIntroduction/chapter_1_section_1.html
17 //===----------------------------------------------------------------------===//
20 #include "InstPrinter/PPCInstPrinter.h"
21 #include "MCTargetDesc/PPCMCExpr.h"
22 #include "MCTargetDesc/PPCPredicates.h"
23 #include "PPCMachineFunctionInfo.h"
24 #include "PPCSubtarget.h"
25 #include "PPCTargetMachine.h"
26 #include "PPCTargetStreamer.h"
27 #include "llvm/ADT/MapVector.h"
28 #include "llvm/ADT/SmallString.h"
29 #include "llvm/ADT/StringExtras.h"
30 #include "llvm/CodeGen/AsmPrinter.h"
31 #include "llvm/CodeGen/MachineConstantPool.h"
32 #include "llvm/CodeGen/MachineFunctionPass.h"
33 #include "llvm/CodeGen/MachineInstr.h"
34 #include "llvm/CodeGen/MachineInstrBuilder.h"
35 #include "llvm/CodeGen/MachineModuleInfoImpls.h"
36 #include "llvm/CodeGen/MachineRegisterInfo.h"
37 #include "llvm/CodeGen/StackMaps.h"
38 #include "llvm/CodeGen/TargetLoweringObjectFileImpl.h"
39 #include "llvm/IR/Constants.h"
40 #include "llvm/IR/DebugInfo.h"
41 #include "llvm/IR/DerivedTypes.h"
42 #include "llvm/IR/Mangler.h"
43 #include "llvm/IR/Module.h"
44 #include "llvm/MC/MCAsmInfo.h"
45 #include "llvm/MC/MCContext.h"
46 #include "llvm/MC/MCExpr.h"
47 #include "llvm/MC/MCInst.h"
48 #include "llvm/MC/MCInstBuilder.h"
49 #include "llvm/MC/MCSectionELF.h"
50 #include "llvm/MC/MCSectionMachO.h"
51 #include "llvm/MC/MCStreamer.h"
52 #include "llvm/MC/MCSymbolELF.h"
53 #include "llvm/Support/CommandLine.h"
54 #include "llvm/Support/Debug.h"
55 #include "llvm/Support/ELF.h"
56 #include "llvm/Support/ErrorHandling.h"
57 #include "llvm/Support/MathExtras.h"
58 #include "llvm/Support/TargetRegistry.h"
59 #include "llvm/Support/raw_ostream.h"
60 #include "llvm/Target/TargetInstrInfo.h"
61 #include "llvm/Target/TargetOptions.h"
62 #include "llvm/Target/TargetRegisterInfo.h"
65 #define DEBUG_TYPE "asmprinter"
68 class PPCAsmPrinter : public AsmPrinter {
70 MapVector<MCSymbol*, MCSymbol*> TOC;
71 const PPCSubtarget *Subtarget;
74 explicit PPCAsmPrinter(TargetMachine &TM,
75 std::unique_ptr<MCStreamer> Streamer)
76 : AsmPrinter(TM, std::move(Streamer)), SM(*this) {}
78 const char *getPassName() const override {
79 return "PowerPC Assembly Printer";
82 MCSymbol *lookUpOrCreateTOCEntry(MCSymbol *Sym);
84 void EmitInstruction(const MachineInstr *MI) override;
86 void printOperand(const MachineInstr *MI, unsigned OpNo, raw_ostream &O);
88 bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
89 unsigned AsmVariant, const char *ExtraCode,
90 raw_ostream &O) override;
91 bool PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
92 unsigned AsmVariant, const char *ExtraCode,
93 raw_ostream &O) override;
95 void EmitEndOfAsmFile(Module &M) override;
97 void LowerSTACKMAP(MCStreamer &OutStreamer, StackMaps &SM,
98 const MachineInstr &MI);
99 void LowerPATCHPOINT(MCStreamer &OutStreamer, StackMaps &SM,
100 const MachineInstr &MI);
101 void EmitTlsCall(const MachineInstr *MI, MCSymbolRefExpr::VariantKind VK);
102 bool runOnMachineFunction(MachineFunction &MF) override {
103 Subtarget = &MF.getSubtarget<PPCSubtarget>();
104 return AsmPrinter::runOnMachineFunction(MF);
108 /// PPCLinuxAsmPrinter - PowerPC assembly printer, customized for Linux
109 class PPCLinuxAsmPrinter : public PPCAsmPrinter {
111 explicit PPCLinuxAsmPrinter(TargetMachine &TM,
112 std::unique_ptr<MCStreamer> Streamer)
113 : PPCAsmPrinter(TM, std::move(Streamer)) {}
115 const char *getPassName() const override {
116 return "Linux PPC Assembly Printer";
119 bool doFinalization(Module &M) override;
120 void EmitStartOfAsmFile(Module &M) override;
122 void EmitFunctionEntryLabel() override;
124 void EmitFunctionBodyStart() override;
125 void EmitFunctionBodyEnd() override;
128 /// PPCDarwinAsmPrinter - PowerPC assembly printer, customized for Darwin/Mac
130 class PPCDarwinAsmPrinter : public PPCAsmPrinter {
132 explicit PPCDarwinAsmPrinter(TargetMachine &TM,
133 std::unique_ptr<MCStreamer> Streamer)
134 : PPCAsmPrinter(TM, std::move(Streamer)) {}
136 const char *getPassName() const override {
137 return "Darwin PPC Assembly Printer";
140 bool doFinalization(Module &M) override;
141 void EmitStartOfAsmFile(Module &M) override;
143 void EmitFunctionStubs(const MachineModuleInfoMachO::SymbolListTy &Stubs);
145 } // end of anonymous namespace
147 /// stripRegisterPrefix - This method strips the character prefix from a
148 /// register name so that only the number is left. Used by for linux asm.
149 static const char *stripRegisterPrefix(const char *RegName) {
150 switch (RegName[0]) {
155 if (RegName[1] == 's')
158 case 'c': if (RegName[1] == 'r') return RegName + 2;
164 void PPCAsmPrinter::printOperand(const MachineInstr *MI, unsigned OpNo,
166 const DataLayout *DL = TM.getDataLayout();
167 const MachineOperand &MO = MI->getOperand(OpNo);
169 switch (MO.getType()) {
170 case MachineOperand::MO_Register: {
171 const char *RegName = PPCInstPrinter::getRegisterName(MO.getReg());
172 // Linux assembler (Others?) does not take register mnemonics.
173 // FIXME - What about special registers used in mfspr/mtspr?
174 if (!Subtarget->isDarwin())
175 RegName = stripRegisterPrefix(RegName);
179 case MachineOperand::MO_Immediate:
183 case MachineOperand::MO_MachineBasicBlock:
184 MO.getMBB()->getSymbol()->print(O, MAI);
186 case MachineOperand::MO_ConstantPoolIndex:
187 O << DL->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber()
188 << '_' << MO.getIndex();
190 case MachineOperand::MO_BlockAddress:
191 GetBlockAddressSymbol(MO.getBlockAddress())->print(O, MAI);
193 case MachineOperand::MO_GlobalAddress: {
194 // Computing the address of a global symbol, not calling it.
195 const GlobalValue *GV = MO.getGlobal();
196 MCSymbol *SymToPrint;
198 // External or weakly linked global variables need non-lazily-resolved stubs
199 if (TM.getRelocationModel() != Reloc::Static &&
200 !GV->isStrongDefinitionForLinker()) {
201 if (!GV->hasHiddenVisibility()) {
202 SymToPrint = getSymbolWithGlobalValueBase(GV, "$non_lazy_ptr");
203 MachineModuleInfoImpl::StubValueTy &StubSym =
204 MMI->getObjFileInfo<MachineModuleInfoMachO>()
205 .getGVStubEntry(SymToPrint);
206 if (!StubSym.getPointer())
207 StubSym = MachineModuleInfoImpl::
208 StubValueTy(getSymbol(GV), !GV->hasInternalLinkage());
209 } else if (GV->isDeclaration() || GV->hasCommonLinkage() ||
210 GV->hasAvailableExternallyLinkage()) {
211 SymToPrint = getSymbolWithGlobalValueBase(GV, "$non_lazy_ptr");
213 MachineModuleInfoImpl::StubValueTy &StubSym =
214 MMI->getObjFileInfo<MachineModuleInfoMachO>().
215 getHiddenGVStubEntry(SymToPrint);
216 if (!StubSym.getPointer())
217 StubSym = MachineModuleInfoImpl::
218 StubValueTy(getSymbol(GV), !GV->hasInternalLinkage());
220 SymToPrint = getSymbol(GV);
223 SymToPrint = getSymbol(GV);
226 SymToPrint->print(O, MAI);
228 printOffset(MO.getOffset(), O);
233 O << "<unknown operand type: " << (unsigned)MO.getType() << ">";
238 /// PrintAsmOperand - Print out an operand for an inline asm expression.
240 bool PPCAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
242 const char *ExtraCode, raw_ostream &O) {
243 // Does this asm operand have a single letter operand modifier?
244 if (ExtraCode && ExtraCode[0]) {
245 if (ExtraCode[1] != 0) return true; // Unknown modifier.
247 switch (ExtraCode[0]) {
249 // See if this is a generic print operand
250 return AsmPrinter::PrintAsmOperand(MI, OpNo, AsmVariant, ExtraCode, O);
251 case 'c': // Don't print "$" before a global var name or constant.
252 break; // PPC never has a prefix.
253 case 'L': // Write second word of DImode reference.
254 // Verify that this operand has two consecutive registers.
255 if (!MI->getOperand(OpNo).isReg() ||
256 OpNo+1 == MI->getNumOperands() ||
257 !MI->getOperand(OpNo+1).isReg())
259 ++OpNo; // Return the high-part.
262 // Write 'i' if an integer constant, otherwise nothing. Used to print
264 if (MI->getOperand(OpNo).isImm())
270 printOperand(MI, OpNo, O);
274 // At the moment, all inline asm memory operands are a single register.
275 // In any case, the output of this routine should always be just one
276 // assembler operand.
278 bool PPCAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
280 const char *ExtraCode,
282 if (ExtraCode && ExtraCode[0]) {
283 if (ExtraCode[1] != 0) return true; // Unknown modifier.
285 switch (ExtraCode[0]) {
286 default: return true; // Unknown modifier.
287 case 'y': // A memory reference for an X-form instruction
289 const char *RegName = "r0";
290 if (!Subtarget->isDarwin())
291 RegName = stripRegisterPrefix(RegName);
292 O << RegName << ", ";
293 printOperand(MI, OpNo, O);
296 case 'U': // Print 'u' for update form.
297 case 'X': // Print 'x' for indexed form.
299 // FIXME: Currently for PowerPC memory operands are always loaded
300 // into a register, so we never get an update or indexed form.
301 // This is bad even for offset forms, since even if we know we
302 // have a value in -16(r1), we will generate a load into r<n>
303 // and then load from 0(r<n>). Until that issue is fixed,
304 // tolerate 'U' and 'X' but don't output anything.
305 assert(MI->getOperand(OpNo).isReg());
311 assert(MI->getOperand(OpNo).isReg());
313 printOperand(MI, OpNo, O);
319 /// lookUpOrCreateTOCEntry -- Given a symbol, look up whether a TOC entry
320 /// exists for it. If not, create one. Then return a symbol that references
322 MCSymbol *PPCAsmPrinter::lookUpOrCreateTOCEntry(MCSymbol *Sym) {
323 MCSymbol *&TOCEntry = TOC[Sym];
325 TOCEntry = createTempSymbol("C");
329 void PPCAsmPrinter::EmitEndOfAsmFile(Module &M) {
330 SM.serializeToStackMapSection();
333 void PPCAsmPrinter::LowerSTACKMAP(MCStreamer &OutStreamer, StackMaps &SM,
334 const MachineInstr &MI) {
335 unsigned NumNOPBytes = MI.getOperand(1).getImm();
337 SM.recordStackMap(MI);
338 assert(NumNOPBytes % 4 == 0 && "Invalid number of NOP bytes requested!");
340 // Scan ahead to trim the shadow.
341 const MachineBasicBlock &MBB = *MI.getParent();
342 MachineBasicBlock::const_iterator MII(MI);
344 while (NumNOPBytes > 0) {
345 if (MII == MBB.end() || MII->isCall() ||
346 MII->getOpcode() == PPC::DBG_VALUE ||
347 MII->getOpcode() == TargetOpcode::PATCHPOINT ||
348 MII->getOpcode() == TargetOpcode::STACKMAP)
355 for (unsigned i = 0; i < NumNOPBytes; i += 4)
356 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::NOP));
359 // Lower a patchpoint of the form:
360 // [<def>], <id>, <numBytes>, <target>, <numArgs>
361 void PPCAsmPrinter::LowerPATCHPOINT(MCStreamer &OutStreamer, StackMaps &SM,
362 const MachineInstr &MI) {
363 SM.recordPatchPoint(MI);
364 PatchPointOpers Opers(&MI);
366 int64_t CallTarget = Opers.getMetaOper(PatchPointOpers::TargetPos).getImm();
367 unsigned EncodedBytes = 0;
369 assert((CallTarget & 0xFFFFFFFFFFFF) == CallTarget &&
370 "High 16 bits of call target should be zero.");
371 unsigned ScratchReg = MI.getOperand(Opers.getNextScratchIdx()).getReg();
373 // Materialize the jump address:
374 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::LI8)
376 .addImm((CallTarget >> 32) & 0xFFFF));
377 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::RLDIC)
380 .addImm(32).addImm(16));
381 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ORIS8)
384 .addImm((CallTarget >> 16) & 0xFFFF));
385 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ORI8)
388 .addImm(CallTarget & 0xFFFF));
390 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::MTCTR8).addReg(ScratchReg));
391 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BCTRL8));
395 unsigned NumBytes = Opers.getMetaOper(PatchPointOpers::NBytesPos).getImm();
396 assert(NumBytes >= EncodedBytes &&
397 "Patchpoint can't request size less than the length of a call.");
398 assert((NumBytes - EncodedBytes) % 4 == 0 &&
399 "Invalid number of NOP bytes requested!");
400 for (unsigned i = EncodedBytes; i < NumBytes; i += 4)
401 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::NOP));
404 /// EmitTlsCall -- Given a GETtls[ld]ADDR[32] instruction, print a
405 /// call to __tls_get_addr to the current output stream.
406 void PPCAsmPrinter::EmitTlsCall(const MachineInstr *MI,
407 MCSymbolRefExpr::VariantKind VK) {
408 StringRef Name = "__tls_get_addr";
409 MCSymbol *TlsGetAddr = OutContext.getOrCreateSymbol(Name);
410 MCSymbolRefExpr::VariantKind Kind = MCSymbolRefExpr::VK_None;
412 assert(MI->getOperand(0).isReg() &&
413 ((Subtarget->isPPC64() && MI->getOperand(0).getReg() == PPC::X3) ||
414 (!Subtarget->isPPC64() && MI->getOperand(0).getReg() == PPC::R3)) &&
415 "GETtls[ld]ADDR[32] must define GPR3");
416 assert(MI->getOperand(1).isReg() &&
417 ((Subtarget->isPPC64() && MI->getOperand(1).getReg() == PPC::X3) ||
418 (!Subtarget->isPPC64() && MI->getOperand(1).getReg() == PPC::R3)) &&
419 "GETtls[ld]ADDR[32] must read GPR3");
421 if (!Subtarget->isPPC64() && !Subtarget->isDarwin() &&
422 TM.getRelocationModel() == Reloc::PIC_)
423 Kind = MCSymbolRefExpr::VK_PLT;
424 const MCSymbolRefExpr *TlsRef =
425 MCSymbolRefExpr::create(TlsGetAddr, Kind, OutContext);
426 const MachineOperand &MO = MI->getOperand(2);
427 const GlobalValue *GValue = MO.getGlobal();
428 MCSymbol *MOSymbol = getSymbol(GValue);
429 const MCExpr *SymVar = MCSymbolRefExpr::create(MOSymbol, VK, OutContext);
430 EmitToStreamer(*OutStreamer,
431 MCInstBuilder(Subtarget->isPPC64() ?
432 PPC::BL8_NOP_TLS : PPC::BL_TLS)
437 /// EmitInstruction -- Print out a single PowerPC MI in Darwin syntax to
438 /// the current output stream.
440 void PPCAsmPrinter::EmitInstruction(const MachineInstr *MI) {
442 bool isPPC64 = Subtarget->isPPC64();
443 bool isDarwin = TM.getTargetTriple().isOSDarwin();
444 const Module *M = MF->getFunction()->getParent();
445 PICLevel::Level PL = M->getPICLevel();
447 // Lower multi-instruction pseudo operations.
448 switch (MI->getOpcode()) {
450 case TargetOpcode::DBG_VALUE:
451 llvm_unreachable("Should be handled target independently");
452 case TargetOpcode::STACKMAP:
453 return LowerSTACKMAP(*OutStreamer, SM, *MI);
454 case TargetOpcode::PATCHPOINT:
455 return LowerPATCHPOINT(*OutStreamer, SM, *MI);
457 case PPC::MoveGOTtoLR: {
458 // Transform %LR = MoveGOTtoLR
459 // Into this: bl _GLOBAL_OFFSET_TABLE_@local-4
460 // _GLOBAL_OFFSET_TABLE_@local-4 (instruction preceding
461 // _GLOBAL_OFFSET_TABLE_) has exactly one instruction:
463 // This will return the pointer to _GLOBAL_OFFSET_TABLE_@local
464 MCSymbol *GOTSymbol =
465 OutContext.getOrCreateSymbol(StringRef("_GLOBAL_OFFSET_TABLE_"));
466 const MCExpr *OffsExpr =
467 MCBinaryExpr::createSub(MCSymbolRefExpr::create(GOTSymbol,
468 MCSymbolRefExpr::VK_PPC_LOCAL,
470 MCConstantExpr::create(4, OutContext),
474 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::BL).addExpr(OffsExpr));
477 case PPC::MovePCtoLR:
478 case PPC::MovePCtoLR8: {
479 // Transform %LR = MovePCtoLR
480 // Into this, where the label is the PIC base:
483 MCSymbol *PICBase = MF->getPICBaseSymbol();
486 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::BL)
487 // FIXME: We would like an efficient form for this, so we don't have to do
488 // a lot of extra uniquing.
489 .addExpr(MCSymbolRefExpr::create(PICBase, OutContext)));
492 OutStreamer->EmitLabel(PICBase);
495 case PPC::UpdateGBR: {
496 // Transform %Rd = UpdateGBR(%Rt, %Ri)
497 // Into: lwz %Rt, .L0$poff - .L0$pb(%Ri)
499 // Get the offset from the GOT Base Register to the GOT
500 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin);
501 MCSymbol *PICOffset =
502 MF->getInfo<PPCFunctionInfo>()->getPICOffsetSymbol();
503 TmpInst.setOpcode(PPC::LWZ);
505 MCSymbolRefExpr::create(PICOffset, MCSymbolRefExpr::VK_None, OutContext);
507 MCSymbolRefExpr::create(MF->getPICBaseSymbol(),
508 MCSymbolRefExpr::VK_None,
510 const MCOperand TR = TmpInst.getOperand(1);
511 const MCOperand PICR = TmpInst.getOperand(0);
513 // Step 1: lwz %Rt, .L$poff - .L$pb(%Ri)
514 TmpInst.getOperand(1) =
515 MCOperand::createExpr(MCBinaryExpr::createSub(Exp, PB, OutContext));
516 TmpInst.getOperand(0) = TR;
517 TmpInst.getOperand(2) = PICR;
518 EmitToStreamer(*OutStreamer, TmpInst);
520 TmpInst.setOpcode(PPC::ADD4);
521 TmpInst.getOperand(0) = PICR;
522 TmpInst.getOperand(1) = TR;
523 TmpInst.getOperand(2) = PICR;
524 EmitToStreamer(*OutStreamer, TmpInst);
528 // Transform %R3 = LWZtoc <ga:@min1>, %R2
529 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin);
531 // Change the opcode to LWZ, and the global address operand to be a
532 // reference to the GOT entry we will synthesize later.
533 TmpInst.setOpcode(PPC::LWZ);
534 const MachineOperand &MO = MI->getOperand(1);
536 // Map symbol -> label of TOC entry
537 assert(MO.isGlobal() || MO.isCPI() || MO.isJTI() || MO.isBlockAddress());
538 MCSymbol *MOSymbol = nullptr;
540 MOSymbol = getSymbol(MO.getGlobal());
542 MOSymbol = GetCPISymbol(MO.getIndex());
544 MOSymbol = GetJTISymbol(MO.getIndex());
545 else if (MO.isBlockAddress())
546 MOSymbol = GetBlockAddressSymbol(MO.getBlockAddress());
548 if (PL == PICLevel::Small) {
550 MCSymbolRefExpr::create(MOSymbol, MCSymbolRefExpr::VK_GOT,
552 TmpInst.getOperand(1) = MCOperand::createExpr(Exp);
554 MCSymbol *TOCEntry = lookUpOrCreateTOCEntry(MOSymbol);
557 MCSymbolRefExpr::create(TOCEntry, MCSymbolRefExpr::VK_None,
560 MCSymbolRefExpr::create(OutContext.getOrCreateSymbol(Twine(".LTOC")),
562 Exp = MCBinaryExpr::createSub(Exp, PB, OutContext);
563 TmpInst.getOperand(1) = MCOperand::createExpr(Exp);
565 EmitToStreamer(*OutStreamer, TmpInst);
572 // Transform %X3 = LDtoc <ga:@min1>, %X2
573 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin);
575 // Change the opcode to LD, and the global address operand to be a
576 // reference to the TOC entry we will synthesize later.
577 TmpInst.setOpcode(PPC::LD);
578 const MachineOperand &MO = MI->getOperand(1);
580 // Map symbol -> label of TOC entry
581 assert(MO.isGlobal() || MO.isCPI() || MO.isJTI() || MO.isBlockAddress());
582 MCSymbol *MOSymbol = nullptr;
584 MOSymbol = getSymbol(MO.getGlobal());
586 MOSymbol = GetCPISymbol(MO.getIndex());
588 MOSymbol = GetJTISymbol(MO.getIndex());
589 else if (MO.isBlockAddress())
590 MOSymbol = GetBlockAddressSymbol(MO.getBlockAddress());
592 MCSymbol *TOCEntry = lookUpOrCreateTOCEntry(MOSymbol);
595 MCSymbolRefExpr::create(TOCEntry, MCSymbolRefExpr::VK_PPC_TOC,
597 TmpInst.getOperand(1) = MCOperand::createExpr(Exp);
598 EmitToStreamer(*OutStreamer, TmpInst);
602 case PPC::ADDIStocHA: {
603 // Transform %Xd = ADDIStocHA %X2, <ga:@sym>
604 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin);
606 // Change the opcode to ADDIS8. If the global address is external, has
607 // common linkage, is a non-local function address, or is a jump table
608 // address, then generate a TOC entry and reference that. Otherwise
609 // reference the symbol directly.
610 TmpInst.setOpcode(PPC::ADDIS8);
611 const MachineOperand &MO = MI->getOperand(2);
612 assert((MO.isGlobal() || MO.isCPI() || MO.isJTI() ||
613 MO.isBlockAddress()) &&
614 "Invalid operand for ADDIStocHA!");
615 MCSymbol *MOSymbol = nullptr;
616 bool IsExternal = false;
617 bool IsNonLocalFunction = false;
618 bool IsCommon = false;
619 bool IsAvailExt = false;
622 const GlobalValue *GV = MO.getGlobal();
623 MOSymbol = getSymbol(GV);
624 IsExternal = GV->isDeclaration();
625 IsCommon = GV->hasCommonLinkage();
626 IsNonLocalFunction = GV->getType()->getElementType()->isFunctionTy() &&
627 !GV->isStrongDefinitionForLinker();
628 IsAvailExt = GV->hasAvailableExternallyLinkage();
629 } else if (MO.isCPI())
630 MOSymbol = GetCPISymbol(MO.getIndex());
632 MOSymbol = GetJTISymbol(MO.getIndex());
633 else if (MO.isBlockAddress())
634 MOSymbol = GetBlockAddressSymbol(MO.getBlockAddress());
636 if (IsExternal || IsNonLocalFunction || IsCommon || IsAvailExt ||
637 MO.isJTI() || MO.isBlockAddress() ||
638 TM.getCodeModel() == CodeModel::Large)
639 MOSymbol = lookUpOrCreateTOCEntry(MOSymbol);
642 MCSymbolRefExpr::create(MOSymbol, MCSymbolRefExpr::VK_PPC_TOC_HA,
644 TmpInst.getOperand(2) = MCOperand::createExpr(Exp);
645 EmitToStreamer(*OutStreamer, TmpInst);
649 // Transform %Xd = LDtocL <ga:@sym>, %Xs
650 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin);
652 // Change the opcode to LD. If the global address is external, has
653 // common linkage, or is a jump table address, then reference the
654 // associated TOC entry. Otherwise reference the symbol directly.
655 TmpInst.setOpcode(PPC::LD);
656 const MachineOperand &MO = MI->getOperand(1);
657 assert((MO.isGlobal() || MO.isCPI() || MO.isJTI() ||
658 MO.isBlockAddress()) &&
659 "Invalid operand for LDtocL!");
660 MCSymbol *MOSymbol = nullptr;
663 MOSymbol = lookUpOrCreateTOCEntry(GetJTISymbol(MO.getIndex()));
664 else if (MO.isBlockAddress()) {
665 MOSymbol = GetBlockAddressSymbol(MO.getBlockAddress());
666 MOSymbol = lookUpOrCreateTOCEntry(MOSymbol);
668 else if (MO.isCPI()) {
669 MOSymbol = GetCPISymbol(MO.getIndex());
670 if (TM.getCodeModel() == CodeModel::Large)
671 MOSymbol = lookUpOrCreateTOCEntry(MOSymbol);
673 else if (MO.isGlobal()) {
674 const GlobalValue *GValue = MO.getGlobal();
675 MOSymbol = getSymbol(GValue);
676 if (GValue->getType()->getElementType()->isFunctionTy() ||
677 GValue->isDeclaration() || GValue->hasCommonLinkage() ||
678 GValue->hasAvailableExternallyLinkage() ||
679 TM.getCodeModel() == CodeModel::Large)
680 MOSymbol = lookUpOrCreateTOCEntry(MOSymbol);
684 MCSymbolRefExpr::create(MOSymbol, MCSymbolRefExpr::VK_PPC_TOC_LO,
686 TmpInst.getOperand(1) = MCOperand::createExpr(Exp);
687 EmitToStreamer(*OutStreamer, TmpInst);
690 case PPC::ADDItocL: {
691 // Transform %Xd = ADDItocL %Xs, <ga:@sym>
692 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin);
694 // Change the opcode to ADDI8. If the global address is external, then
695 // generate a TOC entry and reference that. Otherwise reference the
697 TmpInst.setOpcode(PPC::ADDI8);
698 const MachineOperand &MO = MI->getOperand(2);
699 assert((MO.isGlobal() || MO.isCPI()) && "Invalid operand for ADDItocL");
700 MCSymbol *MOSymbol = nullptr;
701 bool IsExternal = false;
702 bool IsNonLocalFunction = false;
705 const GlobalValue *GV = MO.getGlobal();
706 MOSymbol = getSymbol(GV);
707 IsExternal = GV->isDeclaration();
708 IsNonLocalFunction = GV->getType()->getElementType()->isFunctionTy() &&
709 !GV->isStrongDefinitionForLinker();
710 } else if (MO.isCPI())
711 MOSymbol = GetCPISymbol(MO.getIndex());
713 if (IsNonLocalFunction || IsExternal ||
714 TM.getCodeModel() == CodeModel::Large)
715 MOSymbol = lookUpOrCreateTOCEntry(MOSymbol);
718 MCSymbolRefExpr::create(MOSymbol, MCSymbolRefExpr::VK_PPC_TOC_LO,
720 TmpInst.getOperand(2) = MCOperand::createExpr(Exp);
721 EmitToStreamer(*OutStreamer, TmpInst);
724 case PPC::ADDISgotTprelHA: {
725 // Transform: %Xd = ADDISgotTprelHA %X2, <ga:@sym>
726 // Into: %Xd = ADDIS8 %X2, sym@got@tlsgd@ha
727 assert(Subtarget->isPPC64() && "Not supported for 32-bit PowerPC");
728 const MachineOperand &MO = MI->getOperand(2);
729 const GlobalValue *GValue = MO.getGlobal();
730 MCSymbol *MOSymbol = getSymbol(GValue);
731 const MCExpr *SymGotTprel =
732 MCSymbolRefExpr::create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TPREL_HA,
734 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::ADDIS8)
735 .addReg(MI->getOperand(0).getReg())
736 .addReg(MI->getOperand(1).getReg())
737 .addExpr(SymGotTprel));
740 case PPC::LDgotTprelL:
741 case PPC::LDgotTprelL32: {
742 // Transform %Xd = LDgotTprelL <ga:@sym>, %Xs
743 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin);
745 // Change the opcode to LD.
746 TmpInst.setOpcode(isPPC64 ? PPC::LD : PPC::LWZ);
747 const MachineOperand &MO = MI->getOperand(1);
748 const GlobalValue *GValue = MO.getGlobal();
749 MCSymbol *MOSymbol = getSymbol(GValue);
751 MCSymbolRefExpr::create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TPREL_LO,
753 TmpInst.getOperand(1) = MCOperand::createExpr(Exp);
754 EmitToStreamer(*OutStreamer, TmpInst);
758 case PPC::PPC32PICGOT: {
759 MCSymbol *GOTSymbol = OutContext.getOrCreateSymbol(StringRef("_GLOBAL_OFFSET_TABLE_"));
760 MCSymbol *GOTRef = OutContext.createTempSymbol();
761 MCSymbol *NextInstr = OutContext.createTempSymbol();
763 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::BL)
764 // FIXME: We would like an efficient form for this, so we don't have to do
765 // a lot of extra uniquing.
766 .addExpr(MCSymbolRefExpr::create(NextInstr, OutContext)));
767 const MCExpr *OffsExpr =
768 MCBinaryExpr::createSub(MCSymbolRefExpr::create(GOTSymbol, OutContext),
769 MCSymbolRefExpr::create(GOTRef, OutContext),
771 OutStreamer->EmitLabel(GOTRef);
772 OutStreamer->EmitValue(OffsExpr, 4);
773 OutStreamer->EmitLabel(NextInstr);
774 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::MFLR)
775 .addReg(MI->getOperand(0).getReg()));
776 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::LWZ)
777 .addReg(MI->getOperand(1).getReg())
779 .addReg(MI->getOperand(0).getReg()));
780 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::ADD4)
781 .addReg(MI->getOperand(0).getReg())
782 .addReg(MI->getOperand(1).getReg())
783 .addReg(MI->getOperand(0).getReg()));
786 case PPC::PPC32GOT: {
787 MCSymbol *GOTSymbol = OutContext.getOrCreateSymbol(StringRef("_GLOBAL_OFFSET_TABLE_"));
788 const MCExpr *SymGotTlsL =
789 MCSymbolRefExpr::create(GOTSymbol, MCSymbolRefExpr::VK_PPC_LO,
791 const MCExpr *SymGotTlsHA =
792 MCSymbolRefExpr::create(GOTSymbol, MCSymbolRefExpr::VK_PPC_HA,
794 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::LI)
795 .addReg(MI->getOperand(0).getReg())
796 .addExpr(SymGotTlsL));
797 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::ADDIS)
798 .addReg(MI->getOperand(0).getReg())
799 .addReg(MI->getOperand(0).getReg())
800 .addExpr(SymGotTlsHA));
803 case PPC::ADDIStlsgdHA: {
804 // Transform: %Xd = ADDIStlsgdHA %X2, <ga:@sym>
805 // Into: %Xd = ADDIS8 %X2, sym@got@tlsgd@ha
806 assert(Subtarget->isPPC64() && "Not supported for 32-bit PowerPC");
807 const MachineOperand &MO = MI->getOperand(2);
808 const GlobalValue *GValue = MO.getGlobal();
809 MCSymbol *MOSymbol = getSymbol(GValue);
810 const MCExpr *SymGotTlsGD =
811 MCSymbolRefExpr::create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TLSGD_HA,
813 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::ADDIS8)
814 .addReg(MI->getOperand(0).getReg())
815 .addReg(MI->getOperand(1).getReg())
816 .addExpr(SymGotTlsGD));
819 case PPC::ADDItlsgdL:
820 // Transform: %Xd = ADDItlsgdL %Xs, <ga:@sym>
821 // Into: %Xd = ADDI8 %Xs, sym@got@tlsgd@l
822 case PPC::ADDItlsgdL32: {
823 // Transform: %Rd = ADDItlsgdL32 %Rs, <ga:@sym>
824 // Into: %Rd = ADDI %Rs, sym@got@tlsgd
825 const MachineOperand &MO = MI->getOperand(2);
826 const GlobalValue *GValue = MO.getGlobal();
827 MCSymbol *MOSymbol = getSymbol(GValue);
828 const MCExpr *SymGotTlsGD = MCSymbolRefExpr::create(
829 MOSymbol, Subtarget->isPPC64() ? MCSymbolRefExpr::VK_PPC_GOT_TLSGD_LO
830 : MCSymbolRefExpr::VK_PPC_GOT_TLSGD,
832 EmitToStreamer(*OutStreamer,
833 MCInstBuilder(Subtarget->isPPC64() ? PPC::ADDI8 : PPC::ADDI)
834 .addReg(MI->getOperand(0).getReg())
835 .addReg(MI->getOperand(1).getReg())
836 .addExpr(SymGotTlsGD));
839 case PPC::GETtlsADDR:
840 // Transform: %X3 = GETtlsADDR %X3, <ga:@sym>
841 // Into: BL8_NOP_TLS __tls_get_addr(sym at tlsgd)
842 case PPC::GETtlsADDR32: {
843 // Transform: %R3 = GETtlsADDR32 %R3, <ga:@sym>
844 // Into: BL_TLS __tls_get_addr(sym at tlsgd)@PLT
845 EmitTlsCall(MI, MCSymbolRefExpr::VK_PPC_TLSGD);
848 case PPC::ADDIStlsldHA: {
849 // Transform: %Xd = ADDIStlsldHA %X2, <ga:@sym>
850 // Into: %Xd = ADDIS8 %X2, sym@got@tlsld@ha
851 assert(Subtarget->isPPC64() && "Not supported for 32-bit PowerPC");
852 const MachineOperand &MO = MI->getOperand(2);
853 const GlobalValue *GValue = MO.getGlobal();
854 MCSymbol *MOSymbol = getSymbol(GValue);
855 const MCExpr *SymGotTlsLD =
856 MCSymbolRefExpr::create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TLSLD_HA,
858 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::ADDIS8)
859 .addReg(MI->getOperand(0).getReg())
860 .addReg(MI->getOperand(1).getReg())
861 .addExpr(SymGotTlsLD));
864 case PPC::ADDItlsldL:
865 // Transform: %Xd = ADDItlsldL %Xs, <ga:@sym>
866 // Into: %Xd = ADDI8 %Xs, sym@got@tlsld@l
867 case PPC::ADDItlsldL32: {
868 // Transform: %Rd = ADDItlsldL32 %Rs, <ga:@sym>
869 // Into: %Rd = ADDI %Rs, sym@got@tlsld
870 const MachineOperand &MO = MI->getOperand(2);
871 const GlobalValue *GValue = MO.getGlobal();
872 MCSymbol *MOSymbol = getSymbol(GValue);
873 const MCExpr *SymGotTlsLD = MCSymbolRefExpr::create(
874 MOSymbol, Subtarget->isPPC64() ? MCSymbolRefExpr::VK_PPC_GOT_TLSLD_LO
875 : MCSymbolRefExpr::VK_PPC_GOT_TLSLD,
877 EmitToStreamer(*OutStreamer,
878 MCInstBuilder(Subtarget->isPPC64() ? PPC::ADDI8 : PPC::ADDI)
879 .addReg(MI->getOperand(0).getReg())
880 .addReg(MI->getOperand(1).getReg())
881 .addExpr(SymGotTlsLD));
884 case PPC::GETtlsldADDR:
885 // Transform: %X3 = GETtlsldADDR %X3, <ga:@sym>
886 // Into: BL8_NOP_TLS __tls_get_addr(sym at tlsld)
887 case PPC::GETtlsldADDR32: {
888 // Transform: %R3 = GETtlsldADDR32 %R3, <ga:@sym>
889 // Into: BL_TLS __tls_get_addr(sym at tlsld)@PLT
890 EmitTlsCall(MI, MCSymbolRefExpr::VK_PPC_TLSLD);
893 case PPC::ADDISdtprelHA:
894 // Transform: %Xd = ADDISdtprelHA %X3, <ga:@sym>
895 // Into: %Xd = ADDIS8 %X3, sym@dtprel@ha
896 case PPC::ADDISdtprelHA32: {
897 // Transform: %Rd = ADDISdtprelHA32 %R3, <ga:@sym>
898 // Into: %Rd = ADDIS %R3, sym@dtprel@ha
899 const MachineOperand &MO = MI->getOperand(2);
900 const GlobalValue *GValue = MO.getGlobal();
901 MCSymbol *MOSymbol = getSymbol(GValue);
902 const MCExpr *SymDtprel =
903 MCSymbolRefExpr::create(MOSymbol, MCSymbolRefExpr::VK_PPC_DTPREL_HA,
907 MCInstBuilder(Subtarget->isPPC64() ? PPC::ADDIS8 : PPC::ADDIS)
908 .addReg(MI->getOperand(0).getReg())
909 .addReg(Subtarget->isPPC64() ? PPC::X3 : PPC::R3)
910 .addExpr(SymDtprel));
913 case PPC::ADDIdtprelL:
914 // Transform: %Xd = ADDIdtprelL %Xs, <ga:@sym>
915 // Into: %Xd = ADDI8 %Xs, sym@dtprel@l
916 case PPC::ADDIdtprelL32: {
917 // Transform: %Rd = ADDIdtprelL32 %Rs, <ga:@sym>
918 // Into: %Rd = ADDI %Rs, sym@dtprel@l
919 const MachineOperand &MO = MI->getOperand(2);
920 const GlobalValue *GValue = MO.getGlobal();
921 MCSymbol *MOSymbol = getSymbol(GValue);
922 const MCExpr *SymDtprel =
923 MCSymbolRefExpr::create(MOSymbol, MCSymbolRefExpr::VK_PPC_DTPREL_LO,
925 EmitToStreamer(*OutStreamer,
926 MCInstBuilder(Subtarget->isPPC64() ? PPC::ADDI8 : PPC::ADDI)
927 .addReg(MI->getOperand(0).getReg())
928 .addReg(MI->getOperand(1).getReg())
929 .addExpr(SymDtprel));
934 if (!Subtarget->hasMFOCRF()) {
935 // Transform: %R3 = MFOCRF %CR7
936 // Into: %R3 = MFCR ;; cr7
938 MI->getOpcode() == PPC::MFOCRF ? PPC::MFCR : PPC::MFCR8;
939 OutStreamer->AddComment(PPCInstPrinter::
940 getRegisterName(MI->getOperand(1).getReg()));
941 EmitToStreamer(*OutStreamer, MCInstBuilder(NewOpcode)
942 .addReg(MI->getOperand(0).getReg()));
948 if (!Subtarget->hasMFOCRF()) {
949 // Transform: %CR7 = MTOCRF %R3
950 // Into: MTCRF mask, %R3 ;; cr7
952 MI->getOpcode() == PPC::MTOCRF ? PPC::MTCRF : PPC::MTCRF8;
953 unsigned Mask = 0x80 >> OutContext.getRegisterInfo()
954 ->getEncodingValue(MI->getOperand(0).getReg());
955 OutStreamer->AddComment(PPCInstPrinter::
956 getRegisterName(MI->getOperand(0).getReg()));
957 EmitToStreamer(*OutStreamer, MCInstBuilder(NewOpcode)
959 .addReg(MI->getOperand(1).getReg()));
967 // Verify alignment is legal, so we don't create relocations
968 // that can't be supported.
969 // FIXME: This test is currently disabled for Darwin. The test
970 // suite shows a handful of test cases that fail this check for
971 // Darwin. Those need to be investigated before this sanity test
972 // can be enabled for those subtargets.
973 if (!Subtarget->isDarwin()) {
974 unsigned OpNum = (MI->getOpcode() == PPC::STD) ? 2 : 1;
975 const MachineOperand &MO = MI->getOperand(OpNum);
976 if (MO.isGlobal() && MO.getGlobal()->getAlignment() < 4)
977 llvm_unreachable("Global must be word-aligned for LD, STD, LWA!");
979 // Now process the instruction normally.
984 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin);
985 EmitToStreamer(*OutStreamer, TmpInst);
988 void PPCLinuxAsmPrinter::EmitStartOfAsmFile(Module &M) {
989 if (static_cast<const PPCTargetMachine &>(TM).isELFv2ABI()) {
990 PPCTargetStreamer *TS =
991 static_cast<PPCTargetStreamer *>(OutStreamer->getTargetStreamer());
994 TS->emitAbiVersion(2);
997 if (static_cast<const PPCTargetMachine &>(TM).isPPC64() ||
998 TM.getRelocationModel() != Reloc::PIC_)
999 return AsmPrinter::EmitStartOfAsmFile(M);
1001 if (M.getPICLevel() == PICLevel::Small)
1002 return AsmPrinter::EmitStartOfAsmFile(M);
1004 OutStreamer->SwitchSection(OutContext.getELFSection(
1005 ".got2", ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC));
1007 MCSymbol *TOCSym = OutContext.getOrCreateSymbol(Twine(".LTOC"));
1008 MCSymbol *CurrentPos = OutContext.createTempSymbol();
1010 OutStreamer->EmitLabel(CurrentPos);
1012 // The GOT pointer points to the middle of the GOT, in order to reference the
1013 // entire 64kB range. 0x8000 is the midpoint.
1014 const MCExpr *tocExpr =
1015 MCBinaryExpr::createAdd(MCSymbolRefExpr::create(CurrentPos, OutContext),
1016 MCConstantExpr::create(0x8000, OutContext),
1019 OutStreamer->EmitAssignment(TOCSym, tocExpr);
1021 OutStreamer->SwitchSection(getObjFileLowering().getTextSection());
1024 void PPCLinuxAsmPrinter::EmitFunctionEntryLabel() {
1025 // linux/ppc32 - Normal entry label.
1026 if (!Subtarget->isPPC64() &&
1027 (TM.getRelocationModel() != Reloc::PIC_ ||
1028 MF->getFunction()->getParent()->getPICLevel() == PICLevel::Small))
1029 return AsmPrinter::EmitFunctionEntryLabel();
1031 if (!Subtarget->isPPC64()) {
1032 const PPCFunctionInfo *PPCFI = MF->getInfo<PPCFunctionInfo>();
1033 if (PPCFI->usesPICBase()) {
1034 MCSymbol *RelocSymbol = PPCFI->getPICOffsetSymbol();
1035 MCSymbol *PICBase = MF->getPICBaseSymbol();
1036 OutStreamer->EmitLabel(RelocSymbol);
1038 const MCExpr *OffsExpr =
1039 MCBinaryExpr::createSub(
1040 MCSymbolRefExpr::create(OutContext.getOrCreateSymbol(Twine(".LTOC")),
1042 MCSymbolRefExpr::create(PICBase, OutContext),
1044 OutStreamer->EmitValue(OffsExpr, 4);
1045 OutStreamer->EmitLabel(CurrentFnSym);
1048 return AsmPrinter::EmitFunctionEntryLabel();
1051 // ELFv2 ABI - Normal entry label.
1052 if (Subtarget->isELFv2ABI())
1053 return AsmPrinter::EmitFunctionEntryLabel();
1055 // Emit an official procedure descriptor.
1056 MCSectionSubPair Current = OutStreamer->getCurrentSection();
1057 MCSectionELF *Section = OutStreamer->getContext().getELFSection(
1058 ".opd", ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC);
1059 OutStreamer->SwitchSection(Section);
1060 OutStreamer->EmitLabel(CurrentFnSym);
1061 OutStreamer->EmitValueToAlignment(8);
1062 MCSymbol *Symbol1 = CurrentFnSymForSize;
1063 // Generates a R_PPC64_ADDR64 (from FK_DATA_8) relocation for the function
1065 OutStreamer->EmitValue(MCSymbolRefExpr::create(Symbol1, OutContext),
1067 MCSymbol *Symbol2 = OutContext.getOrCreateSymbol(StringRef(".TOC."));
1068 // Generates a R_PPC64_TOC relocation for TOC base insertion.
1069 OutStreamer->EmitValue(
1070 MCSymbolRefExpr::create(Symbol2, MCSymbolRefExpr::VK_PPC_TOCBASE, OutContext),
1072 // Emit a null environment pointer.
1073 OutStreamer->EmitIntValue(0, 8 /* size */);
1074 OutStreamer->SwitchSection(Current.first, Current.second);
1078 bool PPCLinuxAsmPrinter::doFinalization(Module &M) {
1079 const DataLayout *TD = TM.getDataLayout();
1081 bool isPPC64 = TD->getPointerSizeInBits() == 64;
1083 PPCTargetStreamer &TS =
1084 static_cast<PPCTargetStreamer &>(*OutStreamer->getTargetStreamer());
1087 MCSectionELF *Section;
1090 Section = OutStreamer->getContext().getELFSection(
1091 ".toc", ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC);
1093 Section = OutStreamer->getContext().getELFSection(
1094 ".got2", ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC);
1095 OutStreamer->SwitchSection(Section);
1097 for (MapVector<MCSymbol*, MCSymbol*>::iterator I = TOC.begin(),
1098 E = TOC.end(); I != E; ++I) {
1099 OutStreamer->EmitLabel(I->second);
1100 MCSymbol *S = I->first;
1104 OutStreamer->EmitSymbolValue(S, 4);
1108 return AsmPrinter::doFinalization(M);
1111 /// EmitFunctionBodyStart - Emit a global entry point prefix for ELFv2.
1112 void PPCLinuxAsmPrinter::EmitFunctionBodyStart() {
1113 // In the ELFv2 ABI, in functions that use the TOC register, we need to
1114 // provide two entry points. The ABI guarantees that when calling the
1115 // local entry point, r2 is set up by the caller to contain the TOC base
1116 // for this function, and when calling the global entry point, r12 is set
1117 // up by the caller to hold the address of the global entry point. We
1118 // thus emit a prefix sequence along the following lines:
1121 // # global entry point
1122 // addis r2,r12,(.TOC.-func)@ha
1123 // addi r2,r2,(.TOC.-func)@l
1124 // .localentry func, .-func
1125 // # local entry point, followed by function body
1127 // This ensures we have r2 set up correctly while executing the function
1128 // body, no matter which entry point is called.
1129 if (Subtarget->isELFv2ABI()
1130 // Only do all that if the function uses r2 in the first place.
1131 && !MF->getRegInfo().use_empty(PPC::X2)) {
1133 MCSymbol *GlobalEntryLabel = OutContext.createTempSymbol();
1134 OutStreamer->EmitLabel(GlobalEntryLabel);
1135 const MCSymbolRefExpr *GlobalEntryLabelExp =
1136 MCSymbolRefExpr::create(GlobalEntryLabel, OutContext);
1138 MCSymbol *TOCSymbol = OutContext.getOrCreateSymbol(StringRef(".TOC."));
1139 const MCExpr *TOCDeltaExpr =
1140 MCBinaryExpr::createSub(MCSymbolRefExpr::create(TOCSymbol, OutContext),
1141 GlobalEntryLabelExp, OutContext);
1143 const MCExpr *TOCDeltaHi =
1144 PPCMCExpr::createHa(TOCDeltaExpr, false, OutContext);
1145 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::ADDIS)
1148 .addExpr(TOCDeltaHi));
1150 const MCExpr *TOCDeltaLo =
1151 PPCMCExpr::createLo(TOCDeltaExpr, false, OutContext);
1152 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::ADDI)
1155 .addExpr(TOCDeltaLo));
1157 MCSymbol *LocalEntryLabel = OutContext.createTempSymbol();
1158 OutStreamer->EmitLabel(LocalEntryLabel);
1159 const MCSymbolRefExpr *LocalEntryLabelExp =
1160 MCSymbolRefExpr::create(LocalEntryLabel, OutContext);
1161 const MCExpr *LocalOffsetExp =
1162 MCBinaryExpr::createSub(LocalEntryLabelExp,
1163 GlobalEntryLabelExp, OutContext);
1165 PPCTargetStreamer *TS =
1166 static_cast<PPCTargetStreamer *>(OutStreamer->getTargetStreamer());
1169 TS->emitLocalEntry(cast<MCSymbolELF>(CurrentFnSym), LocalOffsetExp);
1173 /// EmitFunctionBodyEnd - Print the traceback table before the .size
1176 void PPCLinuxAsmPrinter::EmitFunctionBodyEnd() {
1177 // Only the 64-bit target requires a traceback table. For now,
1178 // we only emit the word of zeroes that GDB requires to find
1179 // the end of the function, and zeroes for the eight-byte
1180 // mandatory fields.
1181 // FIXME: We should fill in the eight-byte mandatory fields as described in
1182 // the PPC64 ELF ABI (this is a low-priority item because GDB does not
1183 // currently make use of these fields).
1184 if (Subtarget->isPPC64()) {
1185 OutStreamer->EmitIntValue(0, 4/*size*/);
1186 OutStreamer->EmitIntValue(0, 8/*size*/);
1190 void PPCDarwinAsmPrinter::EmitStartOfAsmFile(Module &M) {
1191 static const char *const CPUDirectives[] = {
1215 // Get the numerically largest directive.
1216 // FIXME: How should we merge darwin directives?
1217 unsigned Directive = PPC::DIR_NONE;
1218 for (const Function &F : M) {
1219 const PPCSubtarget &STI = TM.getSubtarget<PPCSubtarget>(F);
1220 unsigned FDir = STI.getDarwinDirective();
1221 Directive = Directive > FDir ? FDir : STI.getDarwinDirective();
1222 if (STI.hasMFOCRF() && Directive < PPC::DIR_970)
1223 Directive = PPC::DIR_970;
1224 if (STI.hasAltivec() && Directive < PPC::DIR_7400)
1225 Directive = PPC::DIR_7400;
1226 if (STI.isPPC64() && Directive < PPC::DIR_64)
1227 Directive = PPC::DIR_64;
1230 assert(Directive <= PPC::DIR_64 && "Directive out of range.");
1232 assert(Directive < array_lengthof(CPUDirectives) &&
1233 "CPUDirectives[] might not be up-to-date!");
1234 PPCTargetStreamer &TStreamer =
1235 *static_cast<PPCTargetStreamer *>(OutStreamer->getTargetStreamer());
1236 TStreamer.emitMachine(CPUDirectives[Directive]);
1238 // Prime text sections so they are adjacent. This reduces the likelihood a
1239 // large data or debug section causes a branch to exceed 16M limit.
1240 const TargetLoweringObjectFileMachO &TLOFMacho =
1241 static_cast<const TargetLoweringObjectFileMachO &>(getObjFileLowering());
1242 OutStreamer->SwitchSection(TLOFMacho.getTextCoalSection());
1243 if (TM.getRelocationModel() == Reloc::PIC_) {
1244 OutStreamer->SwitchSection(
1245 OutContext.getMachOSection("__TEXT", "__picsymbolstub1",
1246 MachO::S_SYMBOL_STUBS |
1247 MachO::S_ATTR_PURE_INSTRUCTIONS,
1248 32, SectionKind::getText()));
1249 } else if (TM.getRelocationModel() == Reloc::DynamicNoPIC) {
1250 OutStreamer->SwitchSection(
1251 OutContext.getMachOSection("__TEXT","__symbol_stub1",
1252 MachO::S_SYMBOL_STUBS |
1253 MachO::S_ATTR_PURE_INSTRUCTIONS,
1254 16, SectionKind::getText()));
1256 OutStreamer->SwitchSection(getObjFileLowering().getTextSection());
1259 static MCSymbol *GetLazyPtr(MCSymbol *Sym, MCContext &Ctx) {
1260 // Remove $stub suffix, add $lazy_ptr.
1261 StringRef NoStub = Sym->getName().substr(0, Sym->getName().size()-5);
1262 return Ctx.getOrCreateSymbol(NoStub + "$lazy_ptr");
1265 static MCSymbol *GetAnonSym(MCSymbol *Sym, MCContext &Ctx) {
1266 // Add $tmp suffix to $stub, yielding $stub$tmp.
1267 return Ctx.getOrCreateSymbol(Sym->getName() + "$tmp");
1270 void PPCDarwinAsmPrinter::
1271 EmitFunctionStubs(const MachineModuleInfoMachO::SymbolListTy &Stubs) {
1272 bool isPPC64 = TM.getDataLayout()->getPointerSizeInBits() == 64;
1274 // Construct a local MCSubtargetInfo and shadow EmitToStreamer here.
1275 // This is because the MachineFunction won't exist (but have not yet been
1276 // freed) and since we're at the global level we can use the default
1277 // constructed subtarget.
1278 std::unique_ptr<MCSubtargetInfo> STI(TM.getTarget().createMCSubtargetInfo(
1279 TM.getTargetTriple().str(), TM.getTargetCPU(),
1280 TM.getTargetFeatureString()));
1281 auto EmitToStreamer = [&STI] (MCStreamer &S, const MCInst &Inst) {
1282 S.EmitInstruction(Inst, *STI);
1285 const TargetLoweringObjectFileMachO &TLOFMacho =
1286 static_cast<const TargetLoweringObjectFileMachO &>(getObjFileLowering());
1288 // .lazy_symbol_pointer
1289 MCSection *LSPSection = TLOFMacho.getLazySymbolPointerSection();
1291 // Output stubs for dynamically-linked functions
1292 if (TM.getRelocationModel() == Reloc::PIC_) {
1293 MCSection *StubSection = OutContext.getMachOSection(
1294 "__TEXT", "__picsymbolstub1",
1295 MachO::S_SYMBOL_STUBS | MachO::S_ATTR_PURE_INSTRUCTIONS, 32,
1296 SectionKind::getText());
1297 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
1298 OutStreamer->SwitchSection(StubSection);
1301 MCSymbol *Stub = Stubs[i].first;
1302 MCSymbol *RawSym = Stubs[i].second.getPointer();
1303 MCSymbol *LazyPtr = GetLazyPtr(Stub, OutContext);
1304 MCSymbol *AnonSymbol = GetAnonSym(Stub, OutContext);
1306 OutStreamer->EmitLabel(Stub);
1307 OutStreamer->EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
1309 const MCExpr *Anon = MCSymbolRefExpr::create(AnonSymbol, OutContext);
1310 const MCExpr *LazyPtrExpr = MCSymbolRefExpr::create(LazyPtr, OutContext);
1312 MCBinaryExpr::createSub(LazyPtrExpr, Anon, OutContext);
1315 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::MFLR).addReg(PPC::R0));
1316 // bcl 20, 31, AnonSymbol
1317 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::BCLalways).addExpr(Anon));
1318 OutStreamer->EmitLabel(AnonSymbol);
1320 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::MFLR).addReg(PPC::R11));
1321 // addis r11, r11, ha16(LazyPtr - AnonSymbol)
1322 const MCExpr *SubHa16 = PPCMCExpr::createHa(Sub, true, OutContext);
1323 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::ADDIS)
1328 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::MTLR).addReg(PPC::R0));
1330 // ldu r12, lo16(LazyPtr - AnonSymbol)(r11)
1331 // lwzu r12, lo16(LazyPtr - AnonSymbol)(r11)
1332 const MCExpr *SubLo16 = PPCMCExpr::createLo(Sub, true, OutContext);
1333 EmitToStreamer(*OutStreamer, MCInstBuilder(isPPC64 ? PPC::LDU : PPC::LWZU)
1335 .addExpr(SubLo16).addExpr(SubLo16)
1338 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::MTCTR).addReg(PPC::R12));
1340 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::BCTR));
1342 OutStreamer->SwitchSection(LSPSection);
1343 OutStreamer->EmitLabel(LazyPtr);
1344 OutStreamer->EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
1346 MCSymbol *DyldStubBindingHelper =
1347 OutContext.getOrCreateSymbol(StringRef("dyld_stub_binding_helper"));
1349 // .quad dyld_stub_binding_helper
1350 OutStreamer->EmitSymbolValue(DyldStubBindingHelper, 8);
1352 // .long dyld_stub_binding_helper
1353 OutStreamer->EmitSymbolValue(DyldStubBindingHelper, 4);
1356 OutStreamer->AddBlankLine();
1360 MCSection *StubSection = OutContext.getMachOSection(
1361 "__TEXT", "__symbol_stub1",
1362 MachO::S_SYMBOL_STUBS | MachO::S_ATTR_PURE_INSTRUCTIONS, 16,
1363 SectionKind::getText());
1364 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
1365 MCSymbol *Stub = Stubs[i].first;
1366 MCSymbol *RawSym = Stubs[i].second.getPointer();
1367 MCSymbol *LazyPtr = GetLazyPtr(Stub, OutContext);
1368 const MCExpr *LazyPtrExpr = MCSymbolRefExpr::create(LazyPtr, OutContext);
1370 OutStreamer->SwitchSection(StubSection);
1372 OutStreamer->EmitLabel(Stub);
1373 OutStreamer->EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
1375 // lis r11, ha16(LazyPtr)
1376 const MCExpr *LazyPtrHa16 =
1377 PPCMCExpr::createHa(LazyPtrExpr, true, OutContext);
1378 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::LIS)
1380 .addExpr(LazyPtrHa16));
1382 // ldu r12, lo16(LazyPtr)(r11)
1383 // lwzu r12, lo16(LazyPtr)(r11)
1384 const MCExpr *LazyPtrLo16 =
1385 PPCMCExpr::createLo(LazyPtrExpr, true, OutContext);
1386 EmitToStreamer(*OutStreamer, MCInstBuilder(isPPC64 ? PPC::LDU : PPC::LWZU)
1388 .addExpr(LazyPtrLo16).addExpr(LazyPtrLo16)
1392 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::MTCTR).addReg(PPC::R12));
1394 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::BCTR));
1396 OutStreamer->SwitchSection(LSPSection);
1397 OutStreamer->EmitLabel(LazyPtr);
1398 OutStreamer->EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
1400 MCSymbol *DyldStubBindingHelper =
1401 OutContext.getOrCreateSymbol(StringRef("dyld_stub_binding_helper"));
1403 // .quad dyld_stub_binding_helper
1404 OutStreamer->EmitSymbolValue(DyldStubBindingHelper, 8);
1406 // .long dyld_stub_binding_helper
1407 OutStreamer->EmitSymbolValue(DyldStubBindingHelper, 4);
1411 OutStreamer->AddBlankLine();
1415 bool PPCDarwinAsmPrinter::doFinalization(Module &M) {
1416 bool isPPC64 = TM.getDataLayout()->getPointerSizeInBits() == 64;
1418 // Darwin/PPC always uses mach-o.
1419 const TargetLoweringObjectFileMachO &TLOFMacho =
1420 static_cast<const TargetLoweringObjectFileMachO &>(getObjFileLowering());
1421 MachineModuleInfoMachO &MMIMacho =
1422 MMI->getObjFileInfo<MachineModuleInfoMachO>();
1424 MachineModuleInfoMachO::SymbolListTy Stubs = MMIMacho.GetFnStubList();
1426 EmitFunctionStubs(Stubs);
1428 if (MAI->doesSupportExceptionHandling() && MMI) {
1429 // Add the (possibly multiple) personalities to the set of global values.
1430 // Only referenced functions get into the Personalities list.
1431 const std::vector<const Function*> &Personalities = MMI->getPersonalities();
1432 for (std::vector<const Function*>::const_iterator I = Personalities.begin(),
1433 E = Personalities.end(); I != E; ++I) {
1435 MCSymbol *NLPSym = getSymbolWithGlobalValueBase(*I, "$non_lazy_ptr");
1436 MachineModuleInfoImpl::StubValueTy &StubSym =
1437 MMIMacho.getGVStubEntry(NLPSym);
1438 StubSym = MachineModuleInfoImpl::StubValueTy(getSymbol(*I), true);
1443 // Output stubs for dynamically-linked functions.
1444 Stubs = MMIMacho.GetGVStubList();
1446 // Output macho stubs for external and common global variables.
1447 if (!Stubs.empty()) {
1448 // Switch with ".non_lazy_symbol_pointer" directive.
1449 OutStreamer->SwitchSection(TLOFMacho.getNonLazySymbolPointerSection());
1450 EmitAlignment(isPPC64 ? 3 : 2);
1452 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
1454 OutStreamer->EmitLabel(Stubs[i].first);
1455 // .indirect_symbol _foo
1456 MachineModuleInfoImpl::StubValueTy &MCSym = Stubs[i].second;
1457 OutStreamer->EmitSymbolAttribute(MCSym.getPointer(), MCSA_IndirectSymbol);
1460 // External to current translation unit.
1461 OutStreamer->EmitIntValue(0, isPPC64 ? 8 : 4/*size*/);
1463 // Internal to current translation unit.
1465 // When we place the LSDA into the TEXT section, the type info pointers
1466 // need to be indirect and pc-rel. We accomplish this by using NLPs.
1467 // However, sometimes the types are local to the file. So we need to
1468 // fill in the value for the NLP in those cases.
1469 OutStreamer->EmitValue(MCSymbolRefExpr::create(MCSym.getPointer(),
1471 isPPC64 ? 8 : 4/*size*/);
1475 OutStreamer->AddBlankLine();
1478 Stubs = MMIMacho.GetHiddenGVStubList();
1479 if (!Stubs.empty()) {
1480 OutStreamer->SwitchSection(getObjFileLowering().getDataSection());
1481 EmitAlignment(isPPC64 ? 3 : 2);
1483 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
1485 OutStreamer->EmitLabel(Stubs[i].first);
1487 OutStreamer->EmitValue(MCSymbolRefExpr::
1488 create(Stubs[i].second.getPointer(),
1490 isPPC64 ? 8 : 4/*size*/);
1494 OutStreamer->AddBlankLine();
1497 // Funny Darwin hack: This flag tells the linker that no global symbols
1498 // contain code that falls through to other global symbols (e.g. the obvious
1499 // implementation of multiple entry points). If this doesn't occur, the
1500 // linker can safely perform dead code stripping. Since LLVM never generates
1501 // code that does this, it is always safe to set.
1502 OutStreamer->EmitAssemblerFlag(MCAF_SubsectionsViaSymbols);
1504 return AsmPrinter::doFinalization(M);
1507 /// createPPCAsmPrinterPass - Returns a pass that prints the PPC assembly code
1508 /// for a MachineFunction to the given output stream, in a format that the
1509 /// Darwin assembler can deal with.
1512 createPPCAsmPrinterPass(TargetMachine &tm,
1513 std::unique_ptr<MCStreamer> &&Streamer) {
1514 if (tm.getTargetTriple().isMacOSX())
1515 return new PPCDarwinAsmPrinter(tm, std::move(Streamer));
1516 return new PPCLinuxAsmPrinter(tm, std::move(Streamer));
1519 // Force static initialization.
1520 extern "C" void LLVMInitializePowerPCAsmPrinter() {
1521 TargetRegistry::RegisterAsmPrinter(ThePPC32Target, createPPCAsmPrinterPass);
1522 TargetRegistry::RegisterAsmPrinter(ThePPC64Target, createPPCAsmPrinterPass);
1523 TargetRegistry::RegisterAsmPrinter(ThePPC64LETarget, createPPCAsmPrinterPass);