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;
75 explicit PPCAsmPrinter(TargetMachine &TM,
76 std::unique_ptr<MCStreamer> Streamer)
77 : AsmPrinter(TM, std::move(Streamer)), SM(*this) {}
79 const char *getPassName() const override {
80 return "PowerPC Assembly Printer";
83 MCSymbol *lookUpOrCreateTOCEntry(MCSymbol *Sym);
85 void EmitInstruction(const MachineInstr *MI) override;
87 void printOperand(const MachineInstr *MI, unsigned OpNo, raw_ostream &O);
89 bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
90 unsigned AsmVariant, const char *ExtraCode,
91 raw_ostream &O) override;
92 bool PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
93 unsigned AsmVariant, const char *ExtraCode,
94 raw_ostream &O) override;
96 void EmitEndOfAsmFile(Module &M) override;
98 void LowerSTACKMAP(StackMaps &SM, const MachineInstr &MI);
99 void LowerPATCHPOINT(StackMaps &SM, const MachineInstr &MI);
100 void EmitTlsCall(const MachineInstr *MI, MCSymbolRefExpr::VariantKind VK);
101 bool runOnMachineFunction(MachineFunction &MF) override {
102 Subtarget = &MF.getSubtarget<PPCSubtarget>();
103 return AsmPrinter::runOnMachineFunction(MF);
107 /// PPCLinuxAsmPrinter - PowerPC assembly printer, customized for Linux
108 class PPCLinuxAsmPrinter : public PPCAsmPrinter {
110 explicit PPCLinuxAsmPrinter(TargetMachine &TM,
111 std::unique_ptr<MCStreamer> Streamer)
112 : PPCAsmPrinter(TM, std::move(Streamer)) {}
114 const char *getPassName() const override {
115 return "Linux PPC Assembly Printer";
118 bool doFinalization(Module &M) override;
119 void EmitStartOfAsmFile(Module &M) override;
121 void EmitFunctionEntryLabel() override;
123 void EmitFunctionBodyStart() override;
124 void EmitFunctionBodyEnd() override;
127 /// PPCDarwinAsmPrinter - PowerPC assembly printer, customized for Darwin/Mac
129 class PPCDarwinAsmPrinter : public PPCAsmPrinter {
131 explicit PPCDarwinAsmPrinter(TargetMachine &TM,
132 std::unique_ptr<MCStreamer> Streamer)
133 : PPCAsmPrinter(TM, std::move(Streamer)) {}
135 const char *getPassName() const override {
136 return "Darwin PPC Assembly Printer";
139 bool doFinalization(Module &M) override;
140 void EmitStartOfAsmFile(Module &M) override;
142 void EmitFunctionStubs(const MachineModuleInfoMachO::SymbolListTy &Stubs);
144 } // end of anonymous namespace
146 /// stripRegisterPrefix - This method strips the character prefix from a
147 /// register name so that only the number is left. Used by for linux asm.
148 static const char *stripRegisterPrefix(const char *RegName) {
149 switch (RegName[0]) {
154 if (RegName[1] == 's')
157 case 'c': if (RegName[1] == 'r') return RegName + 2;
163 void PPCAsmPrinter::printOperand(const MachineInstr *MI, unsigned OpNo,
165 const DataLayout &DL = getDataLayout();
166 const MachineOperand &MO = MI->getOperand(OpNo);
168 switch (MO.getType()) {
169 case MachineOperand::MO_Register: {
170 const char *RegName = PPCInstPrinter::getRegisterName(MO.getReg());
171 // Linux assembler (Others?) does not take register mnemonics.
172 // FIXME - What about special registers used in mfspr/mtspr?
173 if (!Subtarget->isDarwin())
174 RegName = stripRegisterPrefix(RegName);
178 case MachineOperand::MO_Immediate:
182 case MachineOperand::MO_MachineBasicBlock:
183 MO.getMBB()->getSymbol()->print(O, MAI);
185 case MachineOperand::MO_ConstantPoolIndex:
186 O << DL.getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << '_'
189 case MachineOperand::MO_BlockAddress:
190 GetBlockAddressSymbol(MO.getBlockAddress())->print(O, MAI);
192 case MachineOperand::MO_GlobalAddress: {
193 // Computing the address of a global symbol, not calling it.
194 const GlobalValue *GV = MO.getGlobal();
195 MCSymbol *SymToPrint;
197 // External or weakly linked global variables need non-lazily-resolved stubs
198 if (TM.getRelocationModel() != Reloc::Static &&
199 !GV->isStrongDefinitionForLinker()) {
200 if (!GV->hasHiddenVisibility()) {
201 SymToPrint = getSymbolWithGlobalValueBase(GV, "$non_lazy_ptr");
202 MachineModuleInfoImpl::StubValueTy &StubSym =
203 MMI->getObjFileInfo<MachineModuleInfoMachO>().getGVStubEntry(
205 if (!StubSym.getPointer())
206 StubSym = MachineModuleInfoImpl::
207 StubValueTy(getSymbol(GV), !GV->hasInternalLinkage());
208 } else if (GV->isDeclaration() || GV->hasCommonLinkage() ||
209 GV->hasAvailableExternallyLinkage()) {
210 SymToPrint = getSymbolWithGlobalValueBase(GV, "$non_lazy_ptr");
212 MachineModuleInfoImpl::StubValueTy &StubSym =
213 MMI->getObjFileInfo<MachineModuleInfoMachO>().getHiddenGVStubEntry(
215 if (!StubSym.getPointer())
216 StubSym = MachineModuleInfoImpl::
217 StubValueTy(getSymbol(GV), !GV->hasInternalLinkage());
219 SymToPrint = getSymbol(GV);
222 SymToPrint = getSymbol(GV);
225 SymToPrint->print(O, MAI);
227 printOffset(MO.getOffset(), O);
232 O << "<unknown operand type: " << (unsigned)MO.getType() << ">";
237 /// PrintAsmOperand - Print out an operand for an inline asm expression.
239 bool PPCAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
241 const char *ExtraCode, raw_ostream &O) {
242 // Does this asm operand have a single letter operand modifier?
243 if (ExtraCode && ExtraCode[0]) {
244 if (ExtraCode[1] != 0) return true; // Unknown modifier.
246 switch (ExtraCode[0]) {
248 // See if this is a generic print operand
249 return AsmPrinter::PrintAsmOperand(MI, OpNo, AsmVariant, ExtraCode, O);
250 case 'c': // Don't print "$" before a global var name or constant.
251 break; // PPC never has a prefix.
252 case 'L': // Write second word of DImode reference.
253 // Verify that this operand has two consecutive registers.
254 if (!MI->getOperand(OpNo).isReg() ||
255 OpNo+1 == MI->getNumOperands() ||
256 !MI->getOperand(OpNo+1).isReg())
258 ++OpNo; // Return the high-part.
261 // Write 'i' if an integer constant, otherwise nothing. Used to print
263 if (MI->getOperand(OpNo).isImm())
269 printOperand(MI, OpNo, O);
273 // At the moment, all inline asm memory operands are a single register.
274 // In any case, the output of this routine should always be just one
275 // assembler operand.
277 bool PPCAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
279 const char *ExtraCode,
281 if (ExtraCode && ExtraCode[0]) {
282 if (ExtraCode[1] != 0) return true; // Unknown modifier.
284 switch (ExtraCode[0]) {
285 default: return true; // Unknown modifier.
286 case 'y': // A memory reference for an X-form instruction
288 const char *RegName = "r0";
289 if (!Subtarget->isDarwin())
290 RegName = stripRegisterPrefix(RegName);
291 O << RegName << ", ";
292 printOperand(MI, OpNo, O);
295 case 'U': // Print 'u' for update form.
296 case 'X': // Print 'x' for indexed form.
298 // FIXME: Currently for PowerPC memory operands are always loaded
299 // into a register, so we never get an update or indexed form.
300 // This is bad even for offset forms, since even if we know we
301 // have a value in -16(r1), we will generate a load into r<n>
302 // and then load from 0(r<n>). Until that issue is fixed,
303 // tolerate 'U' and 'X' but don't output anything.
304 assert(MI->getOperand(OpNo).isReg());
310 assert(MI->getOperand(OpNo).isReg());
312 printOperand(MI, OpNo, O);
317 /// lookUpOrCreateTOCEntry -- Given a symbol, look up whether a TOC entry
318 /// exists for it. If not, create one. Then return a symbol that references
320 MCSymbol *PPCAsmPrinter::lookUpOrCreateTOCEntry(MCSymbol *Sym) {
321 MCSymbol *&TOCEntry = TOC[Sym];
323 TOCEntry = createTempSymbol("C");
327 void PPCAsmPrinter::EmitEndOfAsmFile(Module &M) {
328 SM.serializeToStackMapSection();
331 void PPCAsmPrinter::LowerSTACKMAP(StackMaps &SM, const MachineInstr &MI) {
332 unsigned NumNOPBytes = MI.getOperand(1).getImm();
334 SM.recordStackMap(MI);
335 assert(NumNOPBytes % 4 == 0 && "Invalid number of NOP bytes requested!");
337 // Scan ahead to trim the shadow.
338 const MachineBasicBlock &MBB = *MI.getParent();
339 MachineBasicBlock::const_iterator MII(MI);
341 while (NumNOPBytes > 0) {
342 if (MII == MBB.end() || MII->isCall() ||
343 MII->getOpcode() == PPC::DBG_VALUE ||
344 MII->getOpcode() == TargetOpcode::PATCHPOINT ||
345 MII->getOpcode() == TargetOpcode::STACKMAP)
352 for (unsigned i = 0; i < NumNOPBytes; i += 4)
353 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::NOP));
356 // Lower a patchpoint of the form:
357 // [<def>], <id>, <numBytes>, <target>, <numArgs>
358 void PPCAsmPrinter::LowerPATCHPOINT(StackMaps &SM, const MachineInstr &MI) {
359 SM.recordPatchPoint(MI);
360 PatchPointOpers Opers(&MI);
362 unsigned EncodedBytes = 0;
363 const MachineOperand &CalleeMO =
364 Opers.getMetaOper(PatchPointOpers::TargetPos);
366 if (CalleeMO.isImm()) {
367 int64_t CallTarget = Opers.getMetaOper(PatchPointOpers::TargetPos).getImm();
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));
378 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::RLDIC)
381 .addImm(32).addImm(16));
383 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::ORIS8)
386 .addImm((CallTarget >> 16) & 0xFFFF));
388 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::ORI8)
391 .addImm(CallTarget & 0xFFFF));
393 // Save the current TOC pointer before the remote call.
394 int TOCSaveOffset = Subtarget->isELFv2ABI() ? 24 : 40;
395 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::STD)
397 .addImm(TOCSaveOffset)
401 // If we're on ELFv1, then we need to load the actual function pointer
402 // from the function descriptor.
403 if (!Subtarget->isELFv2ABI()) {
404 // Load the new TOC pointer and the function address, but not r11
405 // (needing this is rare, and loading it here would prevent passing it
406 // via a 'nest' parameter.
407 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::LD)
410 .addReg(ScratchReg));
412 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::LD)
415 .addReg(ScratchReg));
419 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::MTCTR8)
420 .addReg(ScratchReg));
422 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::BCTRL8));
425 // Restore the TOC pointer after the call.
426 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::LD)
428 .addImm(TOCSaveOffset)
432 } else if (CalleeMO.isGlobal()) {
433 const GlobalValue *GValue = CalleeMO.getGlobal();
434 MCSymbol *MOSymbol = getSymbol(GValue);
435 const MCExpr *SymVar = MCSymbolRefExpr::create(MOSymbol, OutContext);
437 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::BL8_NOP)
442 // Each instruction is 4 bytes.
446 unsigned NumBytes = Opers.getMetaOper(PatchPointOpers::NBytesPos).getImm();
447 assert(NumBytes >= EncodedBytes &&
448 "Patchpoint can't request size less than the length of a call.");
449 assert((NumBytes - EncodedBytes) % 4 == 0 &&
450 "Invalid number of NOP bytes requested!");
451 for (unsigned i = EncodedBytes; i < NumBytes; i += 4)
452 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::NOP));
455 /// EmitTlsCall -- Given a GETtls[ld]ADDR[32] instruction, print a
456 /// call to __tls_get_addr to the current output stream.
457 void PPCAsmPrinter::EmitTlsCall(const MachineInstr *MI,
458 MCSymbolRefExpr::VariantKind VK) {
459 StringRef Name = "__tls_get_addr";
460 MCSymbol *TlsGetAddr = OutContext.getOrCreateSymbol(Name);
461 MCSymbolRefExpr::VariantKind Kind = MCSymbolRefExpr::VK_None;
463 assert(MI->getOperand(0).isReg() &&
464 ((Subtarget->isPPC64() && MI->getOperand(0).getReg() == PPC::X3) ||
465 (!Subtarget->isPPC64() && MI->getOperand(0).getReg() == PPC::R3)) &&
466 "GETtls[ld]ADDR[32] must define GPR3");
467 assert(MI->getOperand(1).isReg() &&
468 ((Subtarget->isPPC64() && MI->getOperand(1).getReg() == PPC::X3) ||
469 (!Subtarget->isPPC64() && MI->getOperand(1).getReg() == PPC::R3)) &&
470 "GETtls[ld]ADDR[32] must read GPR3");
472 if (!Subtarget->isPPC64() && !Subtarget->isDarwin() &&
473 TM.getRelocationModel() == Reloc::PIC_)
474 Kind = MCSymbolRefExpr::VK_PLT;
475 const MCSymbolRefExpr *TlsRef =
476 MCSymbolRefExpr::create(TlsGetAddr, Kind, OutContext);
477 const MachineOperand &MO = MI->getOperand(2);
478 const GlobalValue *GValue = MO.getGlobal();
479 MCSymbol *MOSymbol = getSymbol(GValue);
480 const MCExpr *SymVar = MCSymbolRefExpr::create(MOSymbol, VK, OutContext);
481 EmitToStreamer(*OutStreamer,
482 MCInstBuilder(Subtarget->isPPC64() ?
483 PPC::BL8_NOP_TLS : PPC::BL_TLS)
488 /// EmitInstruction -- Print out a single PowerPC MI in Darwin syntax to
489 /// the current output stream.
491 void PPCAsmPrinter::EmitInstruction(const MachineInstr *MI) {
493 bool isPPC64 = Subtarget->isPPC64();
494 bool isDarwin = TM.getTargetTriple().isOSDarwin();
495 const Module *M = MF->getFunction()->getParent();
496 PICLevel::Level PL = M->getPICLevel();
498 // Lower multi-instruction pseudo operations.
499 switch (MI->getOpcode()) {
501 case TargetOpcode::DBG_VALUE:
502 llvm_unreachable("Should be handled target independently");
503 case TargetOpcode::STACKMAP:
504 return LowerSTACKMAP(SM, *MI);
505 case TargetOpcode::PATCHPOINT:
506 return LowerPATCHPOINT(SM, *MI);
508 case PPC::MoveGOTtoLR: {
509 // Transform %LR = MoveGOTtoLR
510 // Into this: bl _GLOBAL_OFFSET_TABLE_@local-4
511 // _GLOBAL_OFFSET_TABLE_@local-4 (instruction preceding
512 // _GLOBAL_OFFSET_TABLE_) has exactly one instruction:
514 // This will return the pointer to _GLOBAL_OFFSET_TABLE_@local
515 MCSymbol *GOTSymbol =
516 OutContext.getOrCreateSymbol(StringRef("_GLOBAL_OFFSET_TABLE_"));
517 const MCExpr *OffsExpr =
518 MCBinaryExpr::createSub(MCSymbolRefExpr::create(GOTSymbol,
519 MCSymbolRefExpr::VK_PPC_LOCAL,
521 MCConstantExpr::create(4, OutContext),
525 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::BL).addExpr(OffsExpr));
528 case PPC::MovePCtoLR:
529 case PPC::MovePCtoLR8: {
530 // Transform %LR = MovePCtoLR
531 // Into this, where the label is the PIC base:
534 MCSymbol *PICBase = MF->getPICBaseSymbol();
537 EmitToStreamer(*OutStreamer,
538 MCInstBuilder(PPC::BL)
539 // FIXME: We would like an efficient form for this, so we
540 // don't have to do a lot of extra uniquing.
541 .addExpr(MCSymbolRefExpr::create(PICBase, OutContext)));
544 OutStreamer->EmitLabel(PICBase);
547 case PPC::UpdateGBR: {
548 // Transform %Rd = UpdateGBR(%Rt, %Ri)
549 // Into: lwz %Rt, .L0$poff - .L0$pb(%Ri)
551 // Get the offset from the GOT Base Register to the GOT
552 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin);
553 MCSymbol *PICOffset =
554 MF->getInfo<PPCFunctionInfo>()->getPICOffsetSymbol();
555 TmpInst.setOpcode(PPC::LWZ);
557 MCSymbolRefExpr::create(PICOffset, MCSymbolRefExpr::VK_None, OutContext);
559 MCSymbolRefExpr::create(MF->getPICBaseSymbol(),
560 MCSymbolRefExpr::VK_None,
562 const MCOperand TR = TmpInst.getOperand(1);
563 const MCOperand PICR = TmpInst.getOperand(0);
565 // Step 1: lwz %Rt, .L$poff - .L$pb(%Ri)
566 TmpInst.getOperand(1) =
567 MCOperand::createExpr(MCBinaryExpr::createSub(Exp, PB, OutContext));
568 TmpInst.getOperand(0) = TR;
569 TmpInst.getOperand(2) = PICR;
570 EmitToStreamer(*OutStreamer, TmpInst);
572 TmpInst.setOpcode(PPC::ADD4);
573 TmpInst.getOperand(0) = PICR;
574 TmpInst.getOperand(1) = TR;
575 TmpInst.getOperand(2) = PICR;
576 EmitToStreamer(*OutStreamer, TmpInst);
580 // Transform %R3 = LWZtoc <ga:@min1>, %R2
581 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin);
583 // Change the opcode to LWZ, and the global address operand to be a
584 // reference to the GOT entry we will synthesize later.
585 TmpInst.setOpcode(PPC::LWZ);
586 const MachineOperand &MO = MI->getOperand(1);
588 // Map symbol -> label of TOC entry
589 assert(MO.isGlobal() || MO.isCPI() || MO.isJTI() || MO.isBlockAddress());
590 MCSymbol *MOSymbol = nullptr;
592 MOSymbol = getSymbol(MO.getGlobal());
594 MOSymbol = GetCPISymbol(MO.getIndex());
596 MOSymbol = GetJTISymbol(MO.getIndex());
597 else if (MO.isBlockAddress())
598 MOSymbol = GetBlockAddressSymbol(MO.getBlockAddress());
600 if (PL == PICLevel::Small) {
602 MCSymbolRefExpr::create(MOSymbol, MCSymbolRefExpr::VK_GOT,
604 TmpInst.getOperand(1) = MCOperand::createExpr(Exp);
606 MCSymbol *TOCEntry = lookUpOrCreateTOCEntry(MOSymbol);
609 MCSymbolRefExpr::create(TOCEntry, MCSymbolRefExpr::VK_None,
612 MCSymbolRefExpr::create(OutContext.getOrCreateSymbol(Twine(".LTOC")),
614 Exp = MCBinaryExpr::createSub(Exp, PB, OutContext);
615 TmpInst.getOperand(1) = MCOperand::createExpr(Exp);
617 EmitToStreamer(*OutStreamer, TmpInst);
624 // Transform %X3 = LDtoc <ga:@min1>, %X2
625 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin);
627 // Change the opcode to LD, and the global address operand to be a
628 // reference to the TOC entry we will synthesize later.
629 TmpInst.setOpcode(PPC::LD);
630 const MachineOperand &MO = MI->getOperand(1);
632 // Map symbol -> label of TOC entry
633 assert(MO.isGlobal() || MO.isCPI() || MO.isJTI() || MO.isBlockAddress());
634 MCSymbol *MOSymbol = nullptr;
636 MOSymbol = getSymbol(MO.getGlobal());
638 MOSymbol = GetCPISymbol(MO.getIndex());
640 MOSymbol = GetJTISymbol(MO.getIndex());
641 else if (MO.isBlockAddress())
642 MOSymbol = GetBlockAddressSymbol(MO.getBlockAddress());
644 MCSymbol *TOCEntry = lookUpOrCreateTOCEntry(MOSymbol);
647 MCSymbolRefExpr::create(TOCEntry, MCSymbolRefExpr::VK_PPC_TOC,
649 TmpInst.getOperand(1) = MCOperand::createExpr(Exp);
650 EmitToStreamer(*OutStreamer, TmpInst);
654 case PPC::ADDIStocHA: {
655 // Transform %Xd = ADDIStocHA %X2, <ga:@sym>
656 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin);
658 // Change the opcode to ADDIS8. If the global address is external, has
659 // common linkage, is a non-local function address, or is a jump table
660 // address, then generate a TOC entry and reference that. Otherwise
661 // reference the symbol directly.
662 TmpInst.setOpcode(PPC::ADDIS8);
663 const MachineOperand &MO = MI->getOperand(2);
664 assert((MO.isGlobal() || MO.isCPI() || MO.isJTI() ||
665 MO.isBlockAddress()) &&
666 "Invalid operand for ADDIStocHA!");
667 MCSymbol *MOSymbol = nullptr;
668 bool GlobalToc = false;
671 const GlobalValue *GV = MO.getGlobal();
672 MOSymbol = getSymbol(GV);
673 unsigned char GVFlags = Subtarget->classifyGlobalReference(GV);
674 GlobalToc = (GVFlags & PPCII::MO_NLP_FLAG);
675 } else if (MO.isCPI()) {
676 MOSymbol = GetCPISymbol(MO.getIndex());
677 } else if (MO.isJTI()) {
678 MOSymbol = GetJTISymbol(MO.getIndex());
679 } else if (MO.isBlockAddress()) {
680 MOSymbol = GetBlockAddressSymbol(MO.getBlockAddress());
683 if (GlobalToc || MO.isJTI() || MO.isBlockAddress() ||
684 TM.getCodeModel() == CodeModel::Large)
685 MOSymbol = lookUpOrCreateTOCEntry(MOSymbol);
688 MCSymbolRefExpr::create(MOSymbol, MCSymbolRefExpr::VK_PPC_TOC_HA,
690 TmpInst.getOperand(2) = MCOperand::createExpr(Exp);
691 EmitToStreamer(*OutStreamer, TmpInst);
695 // Transform %Xd = LDtocL <ga:@sym>, %Xs
696 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin);
698 // Change the opcode to LD. If the global address is external, has
699 // common linkage, or is a jump table address, then reference the
700 // associated TOC entry. Otherwise reference the symbol directly.
701 TmpInst.setOpcode(PPC::LD);
702 const MachineOperand &MO = MI->getOperand(1);
703 assert((MO.isGlobal() || MO.isCPI() || MO.isJTI() ||
704 MO.isBlockAddress()) &&
705 "Invalid operand for LDtocL!");
706 MCSymbol *MOSymbol = nullptr;
709 MOSymbol = lookUpOrCreateTOCEntry(GetJTISymbol(MO.getIndex()));
710 else if (MO.isBlockAddress()) {
711 MOSymbol = GetBlockAddressSymbol(MO.getBlockAddress());
712 MOSymbol = lookUpOrCreateTOCEntry(MOSymbol);
714 else if (MO.isCPI()) {
715 MOSymbol = GetCPISymbol(MO.getIndex());
716 if (TM.getCodeModel() == CodeModel::Large)
717 MOSymbol = lookUpOrCreateTOCEntry(MOSymbol);
719 else if (MO.isGlobal()) {
720 const GlobalValue *GV = MO.getGlobal();
721 MOSymbol = getSymbol(GV);
723 unsigned char GVFlags = Subtarget->classifyGlobalReference(GV);
724 assert((GVFlags & PPCII::MO_NLP_FLAG) &&
725 "LDtocL used on symbol that could be accessed directly is "
726 "invalid. Must match ADDIStocHA."));
727 MOSymbol = lookUpOrCreateTOCEntry(MOSymbol);
731 MCSymbolRefExpr::create(MOSymbol, MCSymbolRefExpr::VK_PPC_TOC_LO,
733 TmpInst.getOperand(1) = MCOperand::createExpr(Exp);
734 EmitToStreamer(*OutStreamer, TmpInst);
737 case PPC::ADDItocL: {
738 // Transform %Xd = ADDItocL %Xs, <ga:@sym>
739 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin);
741 // Change the opcode to ADDI8. If the global address is external, then
742 // generate a TOC entry and reference that. Otherwise reference the
744 TmpInst.setOpcode(PPC::ADDI8);
745 const MachineOperand &MO = MI->getOperand(2);
746 assert((MO.isGlobal() || MO.isCPI()) && "Invalid operand for ADDItocL");
747 MCSymbol *MOSymbol = nullptr;
750 const GlobalValue *GV = MO.getGlobal();
752 unsigned char GVFlags = Subtarget->classifyGlobalReference(GV);
754 !(GVFlags & PPCII::MO_NLP_FLAG) &&
755 "Interposable definitions must use indirect access."));
756 MOSymbol = getSymbol(GV);
757 } else if (MO.isCPI()) {
758 MOSymbol = GetCPISymbol(MO.getIndex());
762 MCSymbolRefExpr::create(MOSymbol, MCSymbolRefExpr::VK_PPC_TOC_LO,
764 TmpInst.getOperand(2) = MCOperand::createExpr(Exp);
765 EmitToStreamer(*OutStreamer, TmpInst);
768 case PPC::ADDISgotTprelHA: {
769 // Transform: %Xd = ADDISgotTprelHA %X2, <ga:@sym>
770 // Into: %Xd = ADDIS8 %X2, sym@got@tlsgd@ha
771 assert(Subtarget->isPPC64() && "Not supported for 32-bit PowerPC");
772 const MachineOperand &MO = MI->getOperand(2);
773 const GlobalValue *GValue = MO.getGlobal();
774 MCSymbol *MOSymbol = getSymbol(GValue);
775 const MCExpr *SymGotTprel =
776 MCSymbolRefExpr::create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TPREL_HA,
778 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::ADDIS8)
779 .addReg(MI->getOperand(0).getReg())
780 .addReg(MI->getOperand(1).getReg())
781 .addExpr(SymGotTprel));
784 case PPC::LDgotTprelL:
785 case PPC::LDgotTprelL32: {
786 // Transform %Xd = LDgotTprelL <ga:@sym>, %Xs
787 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin);
789 // Change the opcode to LD.
790 TmpInst.setOpcode(isPPC64 ? PPC::LD : PPC::LWZ);
791 const MachineOperand &MO = MI->getOperand(1);
792 const GlobalValue *GValue = MO.getGlobal();
793 MCSymbol *MOSymbol = getSymbol(GValue);
795 MCSymbolRefExpr::create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TPREL_LO,
797 TmpInst.getOperand(1) = MCOperand::createExpr(Exp);
798 EmitToStreamer(*OutStreamer, TmpInst);
802 case PPC::PPC32PICGOT: {
803 MCSymbol *GOTSymbol = OutContext.getOrCreateSymbol(StringRef("_GLOBAL_OFFSET_TABLE_"));
804 MCSymbol *GOTRef = OutContext.createTempSymbol();
805 MCSymbol *NextInstr = OutContext.createTempSymbol();
807 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::BL)
808 // FIXME: We would like an efficient form for this, so we don't have to do
809 // a lot of extra uniquing.
810 .addExpr(MCSymbolRefExpr::create(NextInstr, OutContext)));
811 const MCExpr *OffsExpr =
812 MCBinaryExpr::createSub(MCSymbolRefExpr::create(GOTSymbol, OutContext),
813 MCSymbolRefExpr::create(GOTRef, OutContext),
815 OutStreamer->EmitLabel(GOTRef);
816 OutStreamer->EmitValue(OffsExpr, 4);
817 OutStreamer->EmitLabel(NextInstr);
818 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::MFLR)
819 .addReg(MI->getOperand(0).getReg()));
820 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::LWZ)
821 .addReg(MI->getOperand(1).getReg())
823 .addReg(MI->getOperand(0).getReg()));
824 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::ADD4)
825 .addReg(MI->getOperand(0).getReg())
826 .addReg(MI->getOperand(1).getReg())
827 .addReg(MI->getOperand(0).getReg()));
830 case PPC::PPC32GOT: {
831 MCSymbol *GOTSymbol =
832 OutContext.getOrCreateSymbol(StringRef("_GLOBAL_OFFSET_TABLE_"));
833 const MCExpr *SymGotTlsL = MCSymbolRefExpr::create(
834 GOTSymbol, MCSymbolRefExpr::VK_PPC_LO, OutContext);
835 const MCExpr *SymGotTlsHA = MCSymbolRefExpr::create(
836 GOTSymbol, MCSymbolRefExpr::VK_PPC_HA, OutContext);
837 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::LI)
838 .addReg(MI->getOperand(0).getReg())
839 .addExpr(SymGotTlsL));
840 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::ADDIS)
841 .addReg(MI->getOperand(0).getReg())
842 .addReg(MI->getOperand(0).getReg())
843 .addExpr(SymGotTlsHA));
846 case PPC::ADDIStlsgdHA: {
847 // Transform: %Xd = ADDIStlsgdHA %X2, <ga:@sym>
848 // Into: %Xd = ADDIS8 %X2, sym@got@tlsgd@ha
849 assert(Subtarget->isPPC64() && "Not supported for 32-bit PowerPC");
850 const MachineOperand &MO = MI->getOperand(2);
851 const GlobalValue *GValue = MO.getGlobal();
852 MCSymbol *MOSymbol = getSymbol(GValue);
853 const MCExpr *SymGotTlsGD =
854 MCSymbolRefExpr::create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TLSGD_HA,
856 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::ADDIS8)
857 .addReg(MI->getOperand(0).getReg())
858 .addReg(MI->getOperand(1).getReg())
859 .addExpr(SymGotTlsGD));
862 case PPC::ADDItlsgdL:
863 // Transform: %Xd = ADDItlsgdL %Xs, <ga:@sym>
864 // Into: %Xd = ADDI8 %Xs, sym@got@tlsgd@l
865 case PPC::ADDItlsgdL32: {
866 // Transform: %Rd = ADDItlsgdL32 %Rs, <ga:@sym>
867 // Into: %Rd = ADDI %Rs, sym@got@tlsgd
868 const MachineOperand &MO = MI->getOperand(2);
869 const GlobalValue *GValue = MO.getGlobal();
870 MCSymbol *MOSymbol = getSymbol(GValue);
871 const MCExpr *SymGotTlsGD = MCSymbolRefExpr::create(
872 MOSymbol, Subtarget->isPPC64() ? MCSymbolRefExpr::VK_PPC_GOT_TLSGD_LO
873 : MCSymbolRefExpr::VK_PPC_GOT_TLSGD,
875 EmitToStreamer(*OutStreamer,
876 MCInstBuilder(Subtarget->isPPC64() ? PPC::ADDI8 : PPC::ADDI)
877 .addReg(MI->getOperand(0).getReg())
878 .addReg(MI->getOperand(1).getReg())
879 .addExpr(SymGotTlsGD));
882 case PPC::GETtlsADDR:
883 // Transform: %X3 = GETtlsADDR %X3, <ga:@sym>
884 // Into: BL8_NOP_TLS __tls_get_addr(sym at tlsgd)
885 case PPC::GETtlsADDR32: {
886 // Transform: %R3 = GETtlsADDR32 %R3, <ga:@sym>
887 // Into: BL_TLS __tls_get_addr(sym at tlsgd)@PLT
888 EmitTlsCall(MI, MCSymbolRefExpr::VK_PPC_TLSGD);
891 case PPC::ADDIStlsldHA: {
892 // Transform: %Xd = ADDIStlsldHA %X2, <ga:@sym>
893 // Into: %Xd = ADDIS8 %X2, sym@got@tlsld@ha
894 assert(Subtarget->isPPC64() && "Not supported for 32-bit PowerPC");
895 const MachineOperand &MO = MI->getOperand(2);
896 const GlobalValue *GValue = MO.getGlobal();
897 MCSymbol *MOSymbol = getSymbol(GValue);
898 const MCExpr *SymGotTlsLD =
899 MCSymbolRefExpr::create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TLSLD_HA,
901 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::ADDIS8)
902 .addReg(MI->getOperand(0).getReg())
903 .addReg(MI->getOperand(1).getReg())
904 .addExpr(SymGotTlsLD));
907 case PPC::ADDItlsldL:
908 // Transform: %Xd = ADDItlsldL %Xs, <ga:@sym>
909 // Into: %Xd = ADDI8 %Xs, sym@got@tlsld@l
910 case PPC::ADDItlsldL32: {
911 // Transform: %Rd = ADDItlsldL32 %Rs, <ga:@sym>
912 // Into: %Rd = ADDI %Rs, sym@got@tlsld
913 const MachineOperand &MO = MI->getOperand(2);
914 const GlobalValue *GValue = MO.getGlobal();
915 MCSymbol *MOSymbol = getSymbol(GValue);
916 const MCExpr *SymGotTlsLD = MCSymbolRefExpr::create(
917 MOSymbol, Subtarget->isPPC64() ? MCSymbolRefExpr::VK_PPC_GOT_TLSLD_LO
918 : MCSymbolRefExpr::VK_PPC_GOT_TLSLD,
920 EmitToStreamer(*OutStreamer,
921 MCInstBuilder(Subtarget->isPPC64() ? PPC::ADDI8 : PPC::ADDI)
922 .addReg(MI->getOperand(0).getReg())
923 .addReg(MI->getOperand(1).getReg())
924 .addExpr(SymGotTlsLD));
927 case PPC::GETtlsldADDR:
928 // Transform: %X3 = GETtlsldADDR %X3, <ga:@sym>
929 // Into: BL8_NOP_TLS __tls_get_addr(sym at tlsld)
930 case PPC::GETtlsldADDR32: {
931 // Transform: %R3 = GETtlsldADDR32 %R3, <ga:@sym>
932 // Into: BL_TLS __tls_get_addr(sym at tlsld)@PLT
933 EmitTlsCall(MI, MCSymbolRefExpr::VK_PPC_TLSLD);
936 case PPC::ADDISdtprelHA:
937 // Transform: %Xd = ADDISdtprelHA %Xs, <ga:@sym>
938 // Into: %Xd = ADDIS8 %Xs, sym@dtprel@ha
939 case PPC::ADDISdtprelHA32: {
940 // Transform: %Rd = ADDISdtprelHA32 %Rs, <ga:@sym>
941 // Into: %Rd = ADDIS %Rs, sym@dtprel@ha
942 const MachineOperand &MO = MI->getOperand(2);
943 const GlobalValue *GValue = MO.getGlobal();
944 MCSymbol *MOSymbol = getSymbol(GValue);
945 const MCExpr *SymDtprel =
946 MCSymbolRefExpr::create(MOSymbol, MCSymbolRefExpr::VK_PPC_DTPREL_HA,
950 MCInstBuilder(Subtarget->isPPC64() ? PPC::ADDIS8 : PPC::ADDIS)
951 .addReg(MI->getOperand(0).getReg())
952 .addReg(MI->getOperand(1).getReg())
953 .addExpr(SymDtprel));
956 case PPC::ADDIdtprelL:
957 // Transform: %Xd = ADDIdtprelL %Xs, <ga:@sym>
958 // Into: %Xd = ADDI8 %Xs, sym@dtprel@l
959 case PPC::ADDIdtprelL32: {
960 // Transform: %Rd = ADDIdtprelL32 %Rs, <ga:@sym>
961 // Into: %Rd = ADDI %Rs, sym@dtprel@l
962 const MachineOperand &MO = MI->getOperand(2);
963 const GlobalValue *GValue = MO.getGlobal();
964 MCSymbol *MOSymbol = getSymbol(GValue);
965 const MCExpr *SymDtprel =
966 MCSymbolRefExpr::create(MOSymbol, MCSymbolRefExpr::VK_PPC_DTPREL_LO,
968 EmitToStreamer(*OutStreamer,
969 MCInstBuilder(Subtarget->isPPC64() ? PPC::ADDI8 : PPC::ADDI)
970 .addReg(MI->getOperand(0).getReg())
971 .addReg(MI->getOperand(1).getReg())
972 .addExpr(SymDtprel));
977 if (!Subtarget->hasMFOCRF()) {
978 // Transform: %R3 = MFOCRF %CR7
979 // Into: %R3 = MFCR ;; cr7
981 MI->getOpcode() == PPC::MFOCRF ? PPC::MFCR : PPC::MFCR8;
982 OutStreamer->AddComment(PPCInstPrinter::
983 getRegisterName(MI->getOperand(1).getReg()));
984 EmitToStreamer(*OutStreamer, MCInstBuilder(NewOpcode)
985 .addReg(MI->getOperand(0).getReg()));
991 if (!Subtarget->hasMFOCRF()) {
992 // Transform: %CR7 = MTOCRF %R3
993 // Into: MTCRF mask, %R3 ;; cr7
995 MI->getOpcode() == PPC::MTOCRF ? PPC::MTCRF : PPC::MTCRF8;
996 unsigned Mask = 0x80 >> OutContext.getRegisterInfo()
997 ->getEncodingValue(MI->getOperand(0).getReg());
998 OutStreamer->AddComment(PPCInstPrinter::
999 getRegisterName(MI->getOperand(0).getReg()));
1000 EmitToStreamer(*OutStreamer, MCInstBuilder(NewOpcode)
1002 .addReg(MI->getOperand(1).getReg()));
1010 // Verify alignment is legal, so we don't create relocations
1011 // that can't be supported.
1012 // FIXME: This test is currently disabled for Darwin. The test
1013 // suite shows a handful of test cases that fail this check for
1014 // Darwin. Those need to be investigated before this sanity test
1015 // can be enabled for those subtargets.
1016 if (!Subtarget->isDarwin()) {
1017 unsigned OpNum = (MI->getOpcode() == PPC::STD) ? 2 : 1;
1018 const MachineOperand &MO = MI->getOperand(OpNum);
1019 if (MO.isGlobal() && MO.getGlobal()->getAlignment() < 4)
1020 llvm_unreachable("Global must be word-aligned for LD, STD, LWA!");
1022 // Now process the instruction normally.
1027 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin);
1028 EmitToStreamer(*OutStreamer, TmpInst);
1031 void PPCLinuxAsmPrinter::EmitStartOfAsmFile(Module &M) {
1032 if (static_cast<const PPCTargetMachine &>(TM).isELFv2ABI()) {
1033 PPCTargetStreamer *TS =
1034 static_cast<PPCTargetStreamer *>(OutStreamer->getTargetStreamer());
1037 TS->emitAbiVersion(2);
1040 if (static_cast<const PPCTargetMachine &>(TM).isPPC64() ||
1041 TM.getRelocationModel() != Reloc::PIC_)
1042 return AsmPrinter::EmitStartOfAsmFile(M);
1044 if (M.getPICLevel() == PICLevel::Small)
1045 return AsmPrinter::EmitStartOfAsmFile(M);
1047 OutStreamer->SwitchSection(OutContext.getELFSection(
1048 ".got2", ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC));
1050 MCSymbol *TOCSym = OutContext.getOrCreateSymbol(Twine(".LTOC"));
1051 MCSymbol *CurrentPos = OutContext.createTempSymbol();
1053 OutStreamer->EmitLabel(CurrentPos);
1055 // The GOT pointer points to the middle of the GOT, in order to reference the
1056 // entire 64kB range. 0x8000 is the midpoint.
1057 const MCExpr *tocExpr =
1058 MCBinaryExpr::createAdd(MCSymbolRefExpr::create(CurrentPos, OutContext),
1059 MCConstantExpr::create(0x8000, OutContext),
1062 OutStreamer->EmitAssignment(TOCSym, tocExpr);
1064 OutStreamer->SwitchSection(getObjFileLowering().getTextSection());
1067 void PPCLinuxAsmPrinter::EmitFunctionEntryLabel() {
1068 // linux/ppc32 - Normal entry label.
1069 if (!Subtarget->isPPC64() &&
1070 (TM.getRelocationModel() != Reloc::PIC_ ||
1071 MF->getFunction()->getParent()->getPICLevel() == PICLevel::Small))
1072 return AsmPrinter::EmitFunctionEntryLabel();
1074 if (!Subtarget->isPPC64()) {
1075 const PPCFunctionInfo *PPCFI = MF->getInfo<PPCFunctionInfo>();
1076 if (PPCFI->usesPICBase()) {
1077 MCSymbol *RelocSymbol = PPCFI->getPICOffsetSymbol();
1078 MCSymbol *PICBase = MF->getPICBaseSymbol();
1079 OutStreamer->EmitLabel(RelocSymbol);
1081 const MCExpr *OffsExpr =
1082 MCBinaryExpr::createSub(
1083 MCSymbolRefExpr::create(OutContext.getOrCreateSymbol(Twine(".LTOC")),
1085 MCSymbolRefExpr::create(PICBase, OutContext),
1087 OutStreamer->EmitValue(OffsExpr, 4);
1088 OutStreamer->EmitLabel(CurrentFnSym);
1091 return AsmPrinter::EmitFunctionEntryLabel();
1094 // ELFv2 ABI - Normal entry label.
1095 if (Subtarget->isELFv2ABI())
1096 return AsmPrinter::EmitFunctionEntryLabel();
1098 // Emit an official procedure descriptor.
1099 MCSectionSubPair Current = OutStreamer->getCurrentSection();
1100 MCSectionELF *Section = OutStreamer->getContext().getELFSection(
1101 ".opd", ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC);
1102 OutStreamer->SwitchSection(Section);
1103 OutStreamer->EmitLabel(CurrentFnSym);
1104 OutStreamer->EmitValueToAlignment(8);
1105 MCSymbol *Symbol1 = CurrentFnSymForSize;
1106 // Generates a R_PPC64_ADDR64 (from FK_DATA_8) relocation for the function
1108 OutStreamer->EmitValue(MCSymbolRefExpr::create(Symbol1, OutContext),
1110 MCSymbol *Symbol2 = OutContext.getOrCreateSymbol(StringRef(".TOC."));
1111 // Generates a R_PPC64_TOC relocation for TOC base insertion.
1112 OutStreamer->EmitValue(
1113 MCSymbolRefExpr::create(Symbol2, MCSymbolRefExpr::VK_PPC_TOCBASE, OutContext),
1115 // Emit a null environment pointer.
1116 OutStreamer->EmitIntValue(0, 8 /* size */);
1117 OutStreamer->SwitchSection(Current.first, Current.second);
1120 bool PPCLinuxAsmPrinter::doFinalization(Module &M) {
1121 const DataLayout &DL = getDataLayout();
1123 bool isPPC64 = DL.getPointerSizeInBits() == 64;
1125 PPCTargetStreamer &TS =
1126 static_cast<PPCTargetStreamer &>(*OutStreamer->getTargetStreamer());
1129 MCSectionELF *Section;
1132 Section = OutStreamer->getContext().getELFSection(
1133 ".toc", ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC);
1135 Section = OutStreamer->getContext().getELFSection(
1136 ".got2", ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC);
1137 OutStreamer->SwitchSection(Section);
1139 for (MapVector<MCSymbol*, MCSymbol*>::iterator I = TOC.begin(),
1140 E = TOC.end(); I != E; ++I) {
1141 OutStreamer->EmitLabel(I->second);
1142 MCSymbol *S = I->first;
1146 OutStreamer->EmitSymbolValue(S, 4);
1150 return AsmPrinter::doFinalization(M);
1153 /// EmitFunctionBodyStart - Emit a global entry point prefix for ELFv2.
1154 void PPCLinuxAsmPrinter::EmitFunctionBodyStart() {
1155 // In the ELFv2 ABI, in functions that use the TOC register, we need to
1156 // provide two entry points. The ABI guarantees that when calling the
1157 // local entry point, r2 is set up by the caller to contain the TOC base
1158 // for this function, and when calling the global entry point, r12 is set
1159 // up by the caller to hold the address of the global entry point. We
1160 // thus emit a prefix sequence along the following lines:
1163 // # global entry point
1164 // addis r2,r12,(.TOC.-func)@ha
1165 // addi r2,r2,(.TOC.-func)@l
1166 // .localentry func, .-func
1167 // # local entry point, followed by function body
1169 // This ensures we have r2 set up correctly while executing the function
1170 // body, no matter which entry point is called.
1171 if (Subtarget->isELFv2ABI()
1172 // Only do all that if the function uses r2 in the first place.
1173 && !MF->getRegInfo().use_empty(PPC::X2)) {
1175 MCSymbol *GlobalEntryLabel = OutContext.createTempSymbol();
1176 OutStreamer->EmitLabel(GlobalEntryLabel);
1177 const MCSymbolRefExpr *GlobalEntryLabelExp =
1178 MCSymbolRefExpr::create(GlobalEntryLabel, OutContext);
1180 MCSymbol *TOCSymbol = OutContext.getOrCreateSymbol(StringRef(".TOC."));
1181 const MCExpr *TOCDeltaExpr =
1182 MCBinaryExpr::createSub(MCSymbolRefExpr::create(TOCSymbol, OutContext),
1183 GlobalEntryLabelExp, OutContext);
1185 const MCExpr *TOCDeltaHi =
1186 PPCMCExpr::createHa(TOCDeltaExpr, false, OutContext);
1187 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::ADDIS)
1190 .addExpr(TOCDeltaHi));
1192 const MCExpr *TOCDeltaLo =
1193 PPCMCExpr::createLo(TOCDeltaExpr, false, OutContext);
1194 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::ADDI)
1197 .addExpr(TOCDeltaLo));
1199 MCSymbol *LocalEntryLabel = OutContext.createTempSymbol();
1200 OutStreamer->EmitLabel(LocalEntryLabel);
1201 const MCSymbolRefExpr *LocalEntryLabelExp =
1202 MCSymbolRefExpr::create(LocalEntryLabel, OutContext);
1203 const MCExpr *LocalOffsetExp =
1204 MCBinaryExpr::createSub(LocalEntryLabelExp,
1205 GlobalEntryLabelExp, OutContext);
1207 PPCTargetStreamer *TS =
1208 static_cast<PPCTargetStreamer *>(OutStreamer->getTargetStreamer());
1211 TS->emitLocalEntry(cast<MCSymbolELF>(CurrentFnSym), LocalOffsetExp);
1215 /// EmitFunctionBodyEnd - Print the traceback table before the .size
1218 void PPCLinuxAsmPrinter::EmitFunctionBodyEnd() {
1219 // Only the 64-bit target requires a traceback table. For now,
1220 // we only emit the word of zeroes that GDB requires to find
1221 // the end of the function, and zeroes for the eight-byte
1222 // mandatory fields.
1223 // FIXME: We should fill in the eight-byte mandatory fields as described in
1224 // the PPC64 ELF ABI (this is a low-priority item because GDB does not
1225 // currently make use of these fields).
1226 if (Subtarget->isPPC64()) {
1227 OutStreamer->EmitIntValue(0, 4/*size*/);
1228 OutStreamer->EmitIntValue(0, 8/*size*/);
1232 void PPCDarwinAsmPrinter::EmitStartOfAsmFile(Module &M) {
1233 static const char *const CPUDirectives[] = {
1257 // Get the numerically largest directive.
1258 // FIXME: How should we merge darwin directives?
1259 unsigned Directive = PPC::DIR_NONE;
1260 for (const Function &F : M) {
1261 const PPCSubtarget &STI = TM.getSubtarget<PPCSubtarget>(F);
1262 unsigned FDir = STI.getDarwinDirective();
1263 Directive = Directive > FDir ? FDir : STI.getDarwinDirective();
1264 if (STI.hasMFOCRF() && Directive < PPC::DIR_970)
1265 Directive = PPC::DIR_970;
1266 if (STI.hasAltivec() && Directive < PPC::DIR_7400)
1267 Directive = PPC::DIR_7400;
1268 if (STI.isPPC64() && Directive < PPC::DIR_64)
1269 Directive = PPC::DIR_64;
1272 assert(Directive <= PPC::DIR_64 && "Directive out of range.");
1274 assert(Directive < array_lengthof(CPUDirectives) &&
1275 "CPUDirectives[] might not be up-to-date!");
1276 PPCTargetStreamer &TStreamer =
1277 *static_cast<PPCTargetStreamer *>(OutStreamer->getTargetStreamer());
1278 TStreamer.emitMachine(CPUDirectives[Directive]);
1280 // Prime text sections so they are adjacent. This reduces the likelihood a
1281 // large data or debug section causes a branch to exceed 16M limit.
1282 const TargetLoweringObjectFileMachO &TLOFMacho =
1283 static_cast<const TargetLoweringObjectFileMachO &>(getObjFileLowering());
1284 OutStreamer->SwitchSection(TLOFMacho.getTextCoalSection());
1285 if (TM.getRelocationModel() == Reloc::PIC_) {
1286 OutStreamer->SwitchSection(
1287 OutContext.getMachOSection("__TEXT", "__picsymbolstub1",
1288 MachO::S_SYMBOL_STUBS |
1289 MachO::S_ATTR_PURE_INSTRUCTIONS,
1290 32, SectionKind::getText()));
1291 } else if (TM.getRelocationModel() == Reloc::DynamicNoPIC) {
1292 OutStreamer->SwitchSection(
1293 OutContext.getMachOSection("__TEXT","__symbol_stub1",
1294 MachO::S_SYMBOL_STUBS |
1295 MachO::S_ATTR_PURE_INSTRUCTIONS,
1296 16, SectionKind::getText()));
1298 OutStreamer->SwitchSection(getObjFileLowering().getTextSection());
1301 static MCSymbol *GetLazyPtr(MCSymbol *Sym, MCContext &Ctx) {
1302 // Remove $stub suffix, add $lazy_ptr.
1303 StringRef NoStub = Sym->getName().substr(0, Sym->getName().size()-5);
1304 return Ctx.getOrCreateSymbol(NoStub + "$lazy_ptr");
1307 static MCSymbol *GetAnonSym(MCSymbol *Sym, MCContext &Ctx) {
1308 // Add $tmp suffix to $stub, yielding $stub$tmp.
1309 return Ctx.getOrCreateSymbol(Sym->getName() + "$tmp");
1312 void PPCDarwinAsmPrinter::
1313 EmitFunctionStubs(const MachineModuleInfoMachO::SymbolListTy &Stubs) {
1314 bool isPPC64 = getDataLayout().getPointerSizeInBits() == 64;
1316 // Construct a local MCSubtargetInfo and shadow EmitToStreamer here.
1317 // This is because the MachineFunction won't exist (but have not yet been
1318 // freed) and since we're at the global level we can use the default
1319 // constructed subtarget.
1320 std::unique_ptr<MCSubtargetInfo> STI(TM.getTarget().createMCSubtargetInfo(
1321 TM.getTargetTriple().str(), TM.getTargetCPU(),
1322 TM.getTargetFeatureString()));
1323 auto EmitToStreamer = [&STI] (MCStreamer &S, const MCInst &Inst) {
1324 S.EmitInstruction(Inst, *STI);
1327 const TargetLoweringObjectFileMachO &TLOFMacho =
1328 static_cast<const TargetLoweringObjectFileMachO &>(getObjFileLowering());
1330 // .lazy_symbol_pointer
1331 MCSection *LSPSection = TLOFMacho.getLazySymbolPointerSection();
1333 // Output stubs for dynamically-linked functions
1334 if (TM.getRelocationModel() == Reloc::PIC_) {
1335 MCSection *StubSection = OutContext.getMachOSection(
1336 "__TEXT", "__picsymbolstub1",
1337 MachO::S_SYMBOL_STUBS | MachO::S_ATTR_PURE_INSTRUCTIONS, 32,
1338 SectionKind::getText());
1339 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
1340 OutStreamer->SwitchSection(StubSection);
1343 MCSymbol *Stub = Stubs[i].first;
1344 MCSymbol *RawSym = Stubs[i].second.getPointer();
1345 MCSymbol *LazyPtr = GetLazyPtr(Stub, OutContext);
1346 MCSymbol *AnonSymbol = GetAnonSym(Stub, OutContext);
1348 OutStreamer->EmitLabel(Stub);
1349 OutStreamer->EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
1351 const MCExpr *Anon = MCSymbolRefExpr::create(AnonSymbol, OutContext);
1352 const MCExpr *LazyPtrExpr = MCSymbolRefExpr::create(LazyPtr, OutContext);
1354 MCBinaryExpr::createSub(LazyPtrExpr, Anon, OutContext);
1357 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::MFLR).addReg(PPC::R0));
1358 // bcl 20, 31, AnonSymbol
1359 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::BCLalways).addExpr(Anon));
1360 OutStreamer->EmitLabel(AnonSymbol);
1362 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::MFLR).addReg(PPC::R11));
1363 // addis r11, r11, ha16(LazyPtr - AnonSymbol)
1364 const MCExpr *SubHa16 = PPCMCExpr::createHa(Sub, true, OutContext);
1365 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::ADDIS)
1370 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::MTLR).addReg(PPC::R0));
1372 // ldu r12, lo16(LazyPtr - AnonSymbol)(r11)
1373 // lwzu r12, lo16(LazyPtr - AnonSymbol)(r11)
1374 const MCExpr *SubLo16 = PPCMCExpr::createLo(Sub, true, OutContext);
1375 EmitToStreamer(*OutStreamer, MCInstBuilder(isPPC64 ? PPC::LDU : PPC::LWZU)
1377 .addExpr(SubLo16).addExpr(SubLo16)
1380 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::MTCTR).addReg(PPC::R12));
1382 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::BCTR));
1384 OutStreamer->SwitchSection(LSPSection);
1385 OutStreamer->EmitLabel(LazyPtr);
1386 OutStreamer->EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
1388 MCSymbol *DyldStubBindingHelper =
1389 OutContext.getOrCreateSymbol(StringRef("dyld_stub_binding_helper"));
1391 // .quad dyld_stub_binding_helper
1392 OutStreamer->EmitSymbolValue(DyldStubBindingHelper, 8);
1394 // .long dyld_stub_binding_helper
1395 OutStreamer->EmitSymbolValue(DyldStubBindingHelper, 4);
1398 OutStreamer->AddBlankLine();
1402 MCSection *StubSection = OutContext.getMachOSection(
1403 "__TEXT", "__symbol_stub1",
1404 MachO::S_SYMBOL_STUBS | MachO::S_ATTR_PURE_INSTRUCTIONS, 16,
1405 SectionKind::getText());
1406 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
1407 MCSymbol *Stub = Stubs[i].first;
1408 MCSymbol *RawSym = Stubs[i].second.getPointer();
1409 MCSymbol *LazyPtr = GetLazyPtr(Stub, OutContext);
1410 const MCExpr *LazyPtrExpr = MCSymbolRefExpr::create(LazyPtr, OutContext);
1412 OutStreamer->SwitchSection(StubSection);
1414 OutStreamer->EmitLabel(Stub);
1415 OutStreamer->EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
1417 // lis r11, ha16(LazyPtr)
1418 const MCExpr *LazyPtrHa16 =
1419 PPCMCExpr::createHa(LazyPtrExpr, true, OutContext);
1420 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::LIS)
1422 .addExpr(LazyPtrHa16));
1424 // ldu r12, lo16(LazyPtr)(r11)
1425 // lwzu r12, lo16(LazyPtr)(r11)
1426 const MCExpr *LazyPtrLo16 =
1427 PPCMCExpr::createLo(LazyPtrExpr, true, OutContext);
1428 EmitToStreamer(*OutStreamer, MCInstBuilder(isPPC64 ? PPC::LDU : PPC::LWZU)
1430 .addExpr(LazyPtrLo16).addExpr(LazyPtrLo16)
1434 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::MTCTR).addReg(PPC::R12));
1436 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::BCTR));
1438 OutStreamer->SwitchSection(LSPSection);
1439 OutStreamer->EmitLabel(LazyPtr);
1440 OutStreamer->EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
1442 MCSymbol *DyldStubBindingHelper =
1443 OutContext.getOrCreateSymbol(StringRef("dyld_stub_binding_helper"));
1445 // .quad dyld_stub_binding_helper
1446 OutStreamer->EmitSymbolValue(DyldStubBindingHelper, 8);
1448 // .long dyld_stub_binding_helper
1449 OutStreamer->EmitSymbolValue(DyldStubBindingHelper, 4);
1453 OutStreamer->AddBlankLine();
1456 bool PPCDarwinAsmPrinter::doFinalization(Module &M) {
1457 bool isPPC64 = getDataLayout().getPointerSizeInBits() == 64;
1459 // Darwin/PPC always uses mach-o.
1460 const TargetLoweringObjectFileMachO &TLOFMacho =
1461 static_cast<const TargetLoweringObjectFileMachO &>(getObjFileLowering());
1462 MachineModuleInfoMachO &MMIMacho =
1463 MMI->getObjFileInfo<MachineModuleInfoMachO>();
1465 MachineModuleInfoMachO::SymbolListTy Stubs = MMIMacho.GetFnStubList();
1467 EmitFunctionStubs(Stubs);
1469 if (MAI->doesSupportExceptionHandling() && MMI) {
1470 // Add the (possibly multiple) personalities to the set of global values.
1471 // Only referenced functions get into the Personalities list.
1472 for (const Function *Personality : MMI->getPersonalities()) {
1475 getSymbolWithGlobalValueBase(Personality, "$non_lazy_ptr");
1476 MachineModuleInfoImpl::StubValueTy &StubSym =
1477 MMIMacho.getGVStubEntry(NLPSym);
1479 MachineModuleInfoImpl::StubValueTy(getSymbol(Personality), true);
1484 // Output stubs for dynamically-linked functions.
1485 Stubs = MMIMacho.GetGVStubList();
1487 // Output macho stubs for external and common global variables.
1488 if (!Stubs.empty()) {
1489 // Switch with ".non_lazy_symbol_pointer" directive.
1490 OutStreamer->SwitchSection(TLOFMacho.getNonLazySymbolPointerSection());
1491 EmitAlignment(isPPC64 ? 3 : 2);
1493 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
1495 OutStreamer->EmitLabel(Stubs[i].first);
1496 // .indirect_symbol _foo
1497 MachineModuleInfoImpl::StubValueTy &MCSym = Stubs[i].second;
1498 OutStreamer->EmitSymbolAttribute(MCSym.getPointer(), MCSA_IndirectSymbol);
1501 // External to current translation unit.
1502 OutStreamer->EmitIntValue(0, isPPC64 ? 8 : 4/*size*/);
1504 // Internal to current translation unit.
1506 // When we place the LSDA into the TEXT section, the type info pointers
1507 // need to be indirect and pc-rel. We accomplish this by using NLPs.
1508 // However, sometimes the types are local to the file. So we need to
1509 // fill in the value for the NLP in those cases.
1510 OutStreamer->EmitValue(MCSymbolRefExpr::create(MCSym.getPointer(),
1512 isPPC64 ? 8 : 4/*size*/);
1516 OutStreamer->AddBlankLine();
1519 Stubs = MMIMacho.GetHiddenGVStubList();
1520 if (!Stubs.empty()) {
1521 OutStreamer->SwitchSection(getObjFileLowering().getDataSection());
1522 EmitAlignment(isPPC64 ? 3 : 2);
1524 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
1526 OutStreamer->EmitLabel(Stubs[i].first);
1528 OutStreamer->EmitValue(MCSymbolRefExpr::
1529 create(Stubs[i].second.getPointer(),
1531 isPPC64 ? 8 : 4/*size*/);
1535 OutStreamer->AddBlankLine();
1538 // Funny Darwin hack: This flag tells the linker that no global symbols
1539 // contain code that falls through to other global symbols (e.g. the obvious
1540 // implementation of multiple entry points). If this doesn't occur, the
1541 // linker can safely perform dead code stripping. Since LLVM never generates
1542 // code that does this, it is always safe to set.
1543 OutStreamer->EmitAssemblerFlag(MCAF_SubsectionsViaSymbols);
1545 return AsmPrinter::doFinalization(M);
1548 /// createPPCAsmPrinterPass - Returns a pass that prints the PPC assembly code
1549 /// for a MachineFunction to the given output stream, in a format that the
1550 /// Darwin assembler can deal with.
1553 createPPCAsmPrinterPass(TargetMachine &tm,
1554 std::unique_ptr<MCStreamer> &&Streamer) {
1555 if (tm.getTargetTriple().isMacOSX())
1556 return new PPCDarwinAsmPrinter(tm, std::move(Streamer));
1557 return new PPCLinuxAsmPrinter(tm, std::move(Streamer));
1560 // Force static initialization.
1561 extern "C" void LLVMInitializePowerPCAsmPrinter() {
1562 TargetRegistry::RegisterAsmPrinter(ThePPC32Target, createPPCAsmPrinterPass);
1563 TargetRegistry::RegisterAsmPrinter(ThePPC64Target, createPPCAsmPrinterPass);
1564 TargetRegistry::RegisterAsmPrinter(ThePPC64LETarget, createPPCAsmPrinterPass);