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(MCStreamer &OutStreamer, StackMaps &SM,
99 const MachineInstr &MI);
100 void LowerPATCHPOINT(MCStreamer &OutStreamer, StackMaps &SM,
101 const MachineInstr &MI);
102 void EmitTlsCall(const MachineInstr *MI, MCSymbolRefExpr::VariantKind VK);
103 bool runOnMachineFunction(MachineFunction &MF) override {
104 Subtarget = &MF.getSubtarget<PPCSubtarget>();
105 return AsmPrinter::runOnMachineFunction(MF);
109 /// PPCLinuxAsmPrinter - PowerPC assembly printer, customized for Linux
110 class PPCLinuxAsmPrinter : public PPCAsmPrinter {
112 explicit PPCLinuxAsmPrinter(TargetMachine &TM,
113 std::unique_ptr<MCStreamer> Streamer)
114 : PPCAsmPrinter(TM, std::move(Streamer)) {}
116 const char *getPassName() const override {
117 return "Linux PPC Assembly Printer";
120 bool doFinalization(Module &M) override;
121 void EmitStartOfAsmFile(Module &M) override;
123 void EmitFunctionEntryLabel() override;
125 void EmitFunctionBodyStart() override;
126 void EmitFunctionBodyEnd() override;
129 /// PPCDarwinAsmPrinter - PowerPC assembly printer, customized for Darwin/Mac
131 class PPCDarwinAsmPrinter : public PPCAsmPrinter {
133 explicit PPCDarwinAsmPrinter(TargetMachine &TM,
134 std::unique_ptr<MCStreamer> Streamer)
135 : PPCAsmPrinter(TM, std::move(Streamer)) {}
137 const char *getPassName() const override {
138 return "Darwin PPC Assembly Printer";
141 bool doFinalization(Module &M) override;
142 void EmitStartOfAsmFile(Module &M) override;
144 void EmitFunctionStubs(const MachineModuleInfoMachO::SymbolListTy &Stubs);
146 } // end of anonymous namespace
148 /// stripRegisterPrefix - This method strips the character prefix from a
149 /// register name so that only the number is left. Used by for linux asm.
150 static const char *stripRegisterPrefix(const char *RegName) {
151 switch (RegName[0]) {
156 if (RegName[1] == 's')
159 case 'c': if (RegName[1] == 'r') return RegName + 2;
165 void PPCAsmPrinter::printOperand(const MachineInstr *MI, unsigned OpNo,
167 const DataLayout &DL = getDataLayout();
168 const MachineOperand &MO = MI->getOperand(OpNo);
170 switch (MO.getType()) {
171 case MachineOperand::MO_Register: {
172 const char *RegName = PPCInstPrinter::getRegisterName(MO.getReg());
173 // Linux assembler (Others?) does not take register mnemonics.
174 // FIXME - What about special registers used in mfspr/mtspr?
175 if (!Subtarget->isDarwin())
176 RegName = stripRegisterPrefix(RegName);
180 case MachineOperand::MO_Immediate:
184 case MachineOperand::MO_MachineBasicBlock:
185 MO.getMBB()->getSymbol()->print(O, MAI);
187 case MachineOperand::MO_ConstantPoolIndex:
188 O << DL.getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << '_'
191 case MachineOperand::MO_BlockAddress:
192 GetBlockAddressSymbol(MO.getBlockAddress())->print(O, MAI);
194 case MachineOperand::MO_GlobalAddress: {
195 // Computing the address of a global symbol, not calling it.
196 const GlobalValue *GV = MO.getGlobal();
197 MCSymbol *SymToPrint;
199 // External or weakly linked global variables need non-lazily-resolved stubs
200 if (TM.getRelocationModel() != Reloc::Static &&
201 !GV->isStrongDefinitionForLinker()) {
202 if (!GV->hasHiddenVisibility()) {
203 SymToPrint = getSymbolWithGlobalValueBase(GV, "$non_lazy_ptr");
204 MachineModuleInfoImpl::StubValueTy &StubSym =
205 MMI->getObjFileInfo<MachineModuleInfoMachO>().getGVStubEntry(
207 if (!StubSym.getPointer())
208 StubSym = MachineModuleInfoImpl::
209 StubValueTy(getSymbol(GV), !GV->hasInternalLinkage());
210 } else if (GV->isDeclaration() || GV->hasCommonLinkage() ||
211 GV->hasAvailableExternallyLinkage()) {
212 SymToPrint = getSymbolWithGlobalValueBase(GV, "$non_lazy_ptr");
214 MachineModuleInfoImpl::StubValueTy &StubSym =
215 MMI->getObjFileInfo<MachineModuleInfoMachO>().getHiddenGVStubEntry(
217 if (!StubSym.getPointer())
218 StubSym = MachineModuleInfoImpl::
219 StubValueTy(getSymbol(GV), !GV->hasInternalLinkage());
221 SymToPrint = getSymbol(GV);
224 SymToPrint = getSymbol(GV);
227 SymToPrint->print(O, MAI);
229 printOffset(MO.getOffset(), O);
234 O << "<unknown operand type: " << (unsigned)MO.getType() << ">";
239 /// PrintAsmOperand - Print out an operand for an inline asm expression.
241 bool PPCAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
243 const char *ExtraCode, raw_ostream &O) {
244 // Does this asm operand have a single letter operand modifier?
245 if (ExtraCode && ExtraCode[0]) {
246 if (ExtraCode[1] != 0) return true; // Unknown modifier.
248 switch (ExtraCode[0]) {
250 // See if this is a generic print operand
251 return AsmPrinter::PrintAsmOperand(MI, OpNo, AsmVariant, ExtraCode, O);
252 case 'c': // Don't print "$" before a global var name or constant.
253 break; // PPC never has a prefix.
254 case 'L': // Write second word of DImode reference.
255 // Verify that this operand has two consecutive registers.
256 if (!MI->getOperand(OpNo).isReg() ||
257 OpNo+1 == MI->getNumOperands() ||
258 !MI->getOperand(OpNo+1).isReg())
260 ++OpNo; // Return the high-part.
263 // Write 'i' if an integer constant, otherwise nothing. Used to print
265 if (MI->getOperand(OpNo).isImm())
271 printOperand(MI, OpNo, O);
275 // At the moment, all inline asm memory operands are a single register.
276 // In any case, the output of this routine should always be just one
277 // assembler operand.
279 bool PPCAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
281 const char *ExtraCode,
283 if (ExtraCode && ExtraCode[0]) {
284 if (ExtraCode[1] != 0) return true; // Unknown modifier.
286 switch (ExtraCode[0]) {
287 default: return true; // Unknown modifier.
288 case 'y': // A memory reference for an X-form instruction
290 const char *RegName = "r0";
291 if (!Subtarget->isDarwin())
292 RegName = stripRegisterPrefix(RegName);
293 O << RegName << ", ";
294 printOperand(MI, OpNo, O);
297 case 'U': // Print 'u' for update form.
298 case 'X': // Print 'x' for indexed form.
300 // FIXME: Currently for PowerPC memory operands are always loaded
301 // into a register, so we never get an update or indexed form.
302 // This is bad even for offset forms, since even if we know we
303 // have a value in -16(r1), we will generate a load into r<n>
304 // and then load from 0(r<n>). Until that issue is fixed,
305 // tolerate 'U' and 'X' but don't output anything.
306 assert(MI->getOperand(OpNo).isReg());
312 assert(MI->getOperand(OpNo).isReg());
314 printOperand(MI, OpNo, O);
320 /// lookUpOrCreateTOCEntry -- Given a symbol, look up whether a TOC entry
321 /// exists for it. If not, create one. Then return a symbol that references
323 MCSymbol *PPCAsmPrinter::lookUpOrCreateTOCEntry(MCSymbol *Sym) {
324 MCSymbol *&TOCEntry = TOC[Sym];
326 TOCEntry = createTempSymbol("C");
330 void PPCAsmPrinter::EmitEndOfAsmFile(Module &M) {
331 SM.serializeToStackMapSection();
334 void PPCAsmPrinter::LowerSTACKMAP(MCStreamer &OutStreamer, StackMaps &SM,
335 const MachineInstr &MI) {
336 unsigned NumNOPBytes = MI.getOperand(1).getImm();
338 SM.recordStackMap(MI);
339 assert(NumNOPBytes % 4 == 0 && "Invalid number of NOP bytes requested!");
341 // Scan ahead to trim the shadow.
342 const MachineBasicBlock &MBB = *MI.getParent();
343 MachineBasicBlock::const_iterator MII(MI);
345 while (NumNOPBytes > 0) {
346 if (MII == MBB.end() || MII->isCall() ||
347 MII->getOpcode() == PPC::DBG_VALUE ||
348 MII->getOpcode() == TargetOpcode::PATCHPOINT ||
349 MII->getOpcode() == TargetOpcode::STACKMAP)
356 for (unsigned i = 0; i < NumNOPBytes; i += 4)
357 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::NOP));
360 // Lower a patchpoint of the form:
361 // [<def>], <id>, <numBytes>, <target>, <numArgs>
362 void PPCAsmPrinter::LowerPATCHPOINT(MCStreamer &OutStreamer, StackMaps &SM,
363 const MachineInstr &MI) {
364 SM.recordPatchPoint(MI);
365 PatchPointOpers Opers(&MI);
367 unsigned EncodedBytes = 0;
368 const MachineOperand &CalleeMO =
369 Opers.getMetaOper(PatchPointOpers::TargetPos);
371 if (CalleeMO.isImm()) {
372 int64_t CallTarget = Opers.getMetaOper(PatchPointOpers::TargetPos).getImm();
374 assert((CallTarget & 0xFFFFFFFFFFFF) == CallTarget &&
375 "High 16 bits of call target should be zero.");
376 unsigned ScratchReg = MI.getOperand(Opers.getNextScratchIdx()).getReg();
378 // Materialize the jump address:
379 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::LI8)
381 .addImm((CallTarget >> 32) & 0xFFFF));
383 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::RLDIC)
386 .addImm(32).addImm(16));
388 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ORIS8)
391 .addImm((CallTarget >> 16) & 0xFFFF));
393 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ORI8)
396 .addImm(CallTarget & 0xFFFF));
398 // Save the current TOC pointer before the remote call.
399 int TOCSaveOffset = Subtarget->isELFv2ABI() ? 24 : 40;
400 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::STD)
402 .addImm(TOCSaveOffset)
407 // If we're on ELFv1, then we need to load the actual function pointer
408 // from the function descriptor.
409 if (!Subtarget->isELFv2ABI()) {
410 // Load the new TOC pointer and the function address, but not r11
411 // (needing this is rare, and loading it here would prevent passing it
412 // via a 'nest' parameter.
413 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::LD)
416 .addReg(ScratchReg));
418 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::LD)
421 .addReg(ScratchReg));
425 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::MTCTR8)
426 .addReg(ScratchReg));
428 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BCTRL8));
431 // Restore the TOC pointer after the call.
432 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::LD)
434 .addImm(TOCSaveOffset)
438 } else if (CalleeMO.isGlobal()) {
439 const GlobalValue *GValue = CalleeMO.getGlobal();
440 MCSymbol *MOSymbol = getSymbol(GValue);
441 const MCExpr *SymVar = MCSymbolRefExpr::create(MOSymbol, OutContext);
443 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BL8_NOP)
448 // Each instruction is 4 bytes.
452 unsigned NumBytes = Opers.getMetaOper(PatchPointOpers::NBytesPos).getImm();
453 assert(NumBytes >= EncodedBytes &&
454 "Patchpoint can't request size less than the length of a call.");
455 assert((NumBytes - EncodedBytes) % 4 == 0 &&
456 "Invalid number of NOP bytes requested!");
457 for (unsigned i = EncodedBytes; i < NumBytes; i += 4)
458 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::NOP));
461 /// EmitTlsCall -- Given a GETtls[ld]ADDR[32] instruction, print a
462 /// call to __tls_get_addr to the current output stream.
463 void PPCAsmPrinter::EmitTlsCall(const MachineInstr *MI,
464 MCSymbolRefExpr::VariantKind VK) {
465 StringRef Name = "__tls_get_addr";
466 MCSymbol *TlsGetAddr = OutContext.getOrCreateSymbol(Name);
467 MCSymbolRefExpr::VariantKind Kind = MCSymbolRefExpr::VK_None;
469 assert(MI->getOperand(0).isReg() &&
470 ((Subtarget->isPPC64() && MI->getOperand(0).getReg() == PPC::X3) ||
471 (!Subtarget->isPPC64() && MI->getOperand(0).getReg() == PPC::R3)) &&
472 "GETtls[ld]ADDR[32] must define GPR3");
473 assert(MI->getOperand(1).isReg() &&
474 ((Subtarget->isPPC64() && MI->getOperand(1).getReg() == PPC::X3) ||
475 (!Subtarget->isPPC64() && MI->getOperand(1).getReg() == PPC::R3)) &&
476 "GETtls[ld]ADDR[32] must read GPR3");
478 if (!Subtarget->isPPC64() && !Subtarget->isDarwin() &&
479 TM.getRelocationModel() == Reloc::PIC_)
480 Kind = MCSymbolRefExpr::VK_PLT;
481 const MCSymbolRefExpr *TlsRef =
482 MCSymbolRefExpr::create(TlsGetAddr, Kind, OutContext);
483 const MachineOperand &MO = MI->getOperand(2);
484 const GlobalValue *GValue = MO.getGlobal();
485 MCSymbol *MOSymbol = getSymbol(GValue);
486 const MCExpr *SymVar = MCSymbolRefExpr::create(MOSymbol, VK, OutContext);
487 EmitToStreamer(*OutStreamer,
488 MCInstBuilder(Subtarget->isPPC64() ?
489 PPC::BL8_NOP_TLS : PPC::BL_TLS)
494 /// EmitInstruction -- Print out a single PowerPC MI in Darwin syntax to
495 /// the current output stream.
497 void PPCAsmPrinter::EmitInstruction(const MachineInstr *MI) {
499 bool isPPC64 = Subtarget->isPPC64();
500 bool isDarwin = TM.getTargetTriple().isOSDarwin();
501 const Module *M = MF->getFunction()->getParent();
502 PICLevel::Level PL = M->getPICLevel();
504 // Lower multi-instruction pseudo operations.
505 switch (MI->getOpcode()) {
507 case TargetOpcode::DBG_VALUE:
508 llvm_unreachable("Should be handled target independently");
509 case TargetOpcode::STACKMAP:
510 return LowerSTACKMAP(*OutStreamer, SM, *MI);
511 case TargetOpcode::PATCHPOINT:
512 return LowerPATCHPOINT(*OutStreamer, SM, *MI);
514 case PPC::MoveGOTtoLR: {
515 // Transform %LR = MoveGOTtoLR
516 // Into this: bl _GLOBAL_OFFSET_TABLE_@local-4
517 // _GLOBAL_OFFSET_TABLE_@local-4 (instruction preceding
518 // _GLOBAL_OFFSET_TABLE_) has exactly one instruction:
520 // This will return the pointer to _GLOBAL_OFFSET_TABLE_@local
521 MCSymbol *GOTSymbol =
522 OutContext.getOrCreateSymbol(StringRef("_GLOBAL_OFFSET_TABLE_"));
523 const MCExpr *OffsExpr =
524 MCBinaryExpr::createSub(MCSymbolRefExpr::create(GOTSymbol,
525 MCSymbolRefExpr::VK_PPC_LOCAL,
527 MCConstantExpr::create(4, OutContext),
531 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::BL).addExpr(OffsExpr));
534 case PPC::MovePCtoLR:
535 case PPC::MovePCtoLR8: {
536 // Transform %LR = MovePCtoLR
537 // Into this, where the label is the PIC base:
540 MCSymbol *PICBase = MF->getPICBaseSymbol();
543 EmitToStreamer(*OutStreamer,
544 MCInstBuilder(PPC::BL)
545 // FIXME: We would like an efficient form for this, so we
546 // don't have to do a lot of extra uniquing.
547 .addExpr(MCSymbolRefExpr::create(PICBase, OutContext)));
550 OutStreamer->EmitLabel(PICBase);
553 case PPC::UpdateGBR: {
554 // Transform %Rd = UpdateGBR(%Rt, %Ri)
555 // Into: lwz %Rt, .L0$poff - .L0$pb(%Ri)
557 // Get the offset from the GOT Base Register to the GOT
558 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin);
559 MCSymbol *PICOffset =
560 MF->getInfo<PPCFunctionInfo>()->getPICOffsetSymbol();
561 TmpInst.setOpcode(PPC::LWZ);
563 MCSymbolRefExpr::create(PICOffset, MCSymbolRefExpr::VK_None, OutContext);
565 MCSymbolRefExpr::create(MF->getPICBaseSymbol(),
566 MCSymbolRefExpr::VK_None,
568 const MCOperand TR = TmpInst.getOperand(1);
569 const MCOperand PICR = TmpInst.getOperand(0);
571 // Step 1: lwz %Rt, .L$poff - .L$pb(%Ri)
572 TmpInst.getOperand(1) =
573 MCOperand::createExpr(MCBinaryExpr::createSub(Exp, PB, OutContext));
574 TmpInst.getOperand(0) = TR;
575 TmpInst.getOperand(2) = PICR;
576 EmitToStreamer(*OutStreamer, TmpInst);
578 TmpInst.setOpcode(PPC::ADD4);
579 TmpInst.getOperand(0) = PICR;
580 TmpInst.getOperand(1) = TR;
581 TmpInst.getOperand(2) = PICR;
582 EmitToStreamer(*OutStreamer, TmpInst);
586 // Transform %R3 = LWZtoc <ga:@min1>, %R2
587 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin);
589 // Change the opcode to LWZ, and the global address operand to be a
590 // reference to the GOT entry we will synthesize later.
591 TmpInst.setOpcode(PPC::LWZ);
592 const MachineOperand &MO = MI->getOperand(1);
594 // Map symbol -> label of TOC entry
595 assert(MO.isGlobal() || MO.isCPI() || MO.isJTI() || MO.isBlockAddress());
596 MCSymbol *MOSymbol = nullptr;
598 MOSymbol = getSymbol(MO.getGlobal());
600 MOSymbol = GetCPISymbol(MO.getIndex());
602 MOSymbol = GetJTISymbol(MO.getIndex());
603 else if (MO.isBlockAddress())
604 MOSymbol = GetBlockAddressSymbol(MO.getBlockAddress());
606 if (PL == PICLevel::Small) {
608 MCSymbolRefExpr::create(MOSymbol, MCSymbolRefExpr::VK_GOT,
610 TmpInst.getOperand(1) = MCOperand::createExpr(Exp);
612 MCSymbol *TOCEntry = lookUpOrCreateTOCEntry(MOSymbol);
615 MCSymbolRefExpr::create(TOCEntry, MCSymbolRefExpr::VK_None,
618 MCSymbolRefExpr::create(OutContext.getOrCreateSymbol(Twine(".LTOC")),
620 Exp = MCBinaryExpr::createSub(Exp, PB, OutContext);
621 TmpInst.getOperand(1) = MCOperand::createExpr(Exp);
623 EmitToStreamer(*OutStreamer, TmpInst);
630 // Transform %X3 = LDtoc <ga:@min1>, %X2
631 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin);
633 // Change the opcode to LD, and the global address operand to be a
634 // reference to the TOC entry we will synthesize later.
635 TmpInst.setOpcode(PPC::LD);
636 const MachineOperand &MO = MI->getOperand(1);
638 // Map symbol -> label of TOC entry
639 assert(MO.isGlobal() || MO.isCPI() || MO.isJTI() || MO.isBlockAddress());
640 MCSymbol *MOSymbol = nullptr;
642 MOSymbol = getSymbol(MO.getGlobal());
644 MOSymbol = GetCPISymbol(MO.getIndex());
646 MOSymbol = GetJTISymbol(MO.getIndex());
647 else if (MO.isBlockAddress())
648 MOSymbol = GetBlockAddressSymbol(MO.getBlockAddress());
650 MCSymbol *TOCEntry = lookUpOrCreateTOCEntry(MOSymbol);
653 MCSymbolRefExpr::create(TOCEntry, MCSymbolRefExpr::VK_PPC_TOC,
655 TmpInst.getOperand(1) = MCOperand::createExpr(Exp);
656 EmitToStreamer(*OutStreamer, TmpInst);
660 case PPC::ADDIStocHA: {
661 // Transform %Xd = ADDIStocHA %X2, <ga:@sym>
662 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin);
664 // Change the opcode to ADDIS8. If the global address is external, has
665 // common linkage, is a non-local function address, or is a jump table
666 // address, then generate a TOC entry and reference that. Otherwise
667 // reference the symbol directly.
668 TmpInst.setOpcode(PPC::ADDIS8);
669 const MachineOperand &MO = MI->getOperand(2);
670 assert((MO.isGlobal() || MO.isCPI() || MO.isJTI() ||
671 MO.isBlockAddress()) &&
672 "Invalid operand for ADDIStocHA!");
673 MCSymbol *MOSymbol = nullptr;
674 bool IsExternal = false;
675 bool IsNonLocalFunction = false;
676 bool IsCommon = false;
677 bool IsAvailExt = false;
680 const GlobalValue *GV = MO.getGlobal();
681 MOSymbol = getSymbol(GV);
682 IsExternal = GV->isDeclaration();
683 IsCommon = GV->hasCommonLinkage();
684 IsNonLocalFunction = GV->getType()->getElementType()->isFunctionTy() &&
685 !GV->isStrongDefinitionForLinker();
686 IsAvailExt = GV->hasAvailableExternallyLinkage();
687 } else if (MO.isCPI())
688 MOSymbol = GetCPISymbol(MO.getIndex());
690 MOSymbol = GetJTISymbol(MO.getIndex());
691 else if (MO.isBlockAddress())
692 MOSymbol = GetBlockAddressSymbol(MO.getBlockAddress());
694 if (IsExternal || IsNonLocalFunction || IsCommon || IsAvailExt ||
695 MO.isJTI() || MO.isBlockAddress() ||
696 TM.getCodeModel() == CodeModel::Large)
697 MOSymbol = lookUpOrCreateTOCEntry(MOSymbol);
700 MCSymbolRefExpr::create(MOSymbol, MCSymbolRefExpr::VK_PPC_TOC_HA,
702 TmpInst.getOperand(2) = MCOperand::createExpr(Exp);
703 EmitToStreamer(*OutStreamer, TmpInst);
707 // Transform %Xd = LDtocL <ga:@sym>, %Xs
708 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin);
710 // Change the opcode to LD. If the global address is external, has
711 // common linkage, or is a jump table address, then reference the
712 // associated TOC entry. Otherwise reference the symbol directly.
713 TmpInst.setOpcode(PPC::LD);
714 const MachineOperand &MO = MI->getOperand(1);
715 assert((MO.isGlobal() || MO.isCPI() || MO.isJTI() ||
716 MO.isBlockAddress()) &&
717 "Invalid operand for LDtocL!");
718 MCSymbol *MOSymbol = nullptr;
721 MOSymbol = lookUpOrCreateTOCEntry(GetJTISymbol(MO.getIndex()));
722 else if (MO.isBlockAddress()) {
723 MOSymbol = GetBlockAddressSymbol(MO.getBlockAddress());
724 MOSymbol = lookUpOrCreateTOCEntry(MOSymbol);
726 else if (MO.isCPI()) {
727 MOSymbol = GetCPISymbol(MO.getIndex());
728 if (TM.getCodeModel() == CodeModel::Large)
729 MOSymbol = lookUpOrCreateTOCEntry(MOSymbol);
731 else if (MO.isGlobal()) {
732 const GlobalValue *GValue = MO.getGlobal();
733 MOSymbol = getSymbol(GValue);
734 if (GValue->getType()->getElementType()->isFunctionTy() ||
735 GValue->isDeclaration() || GValue->hasCommonLinkage() ||
736 GValue->hasAvailableExternallyLinkage() ||
737 TM.getCodeModel() == CodeModel::Large)
738 MOSymbol = lookUpOrCreateTOCEntry(MOSymbol);
742 MCSymbolRefExpr::create(MOSymbol, MCSymbolRefExpr::VK_PPC_TOC_LO,
744 TmpInst.getOperand(1) = MCOperand::createExpr(Exp);
745 EmitToStreamer(*OutStreamer, TmpInst);
748 case PPC::ADDItocL: {
749 // Transform %Xd = ADDItocL %Xs, <ga:@sym>
750 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin);
752 // Change the opcode to ADDI8. If the global address is external, then
753 // generate a TOC entry and reference that. Otherwise reference the
755 TmpInst.setOpcode(PPC::ADDI8);
756 const MachineOperand &MO = MI->getOperand(2);
757 assert((MO.isGlobal() || MO.isCPI()) && "Invalid operand for ADDItocL");
758 MCSymbol *MOSymbol = nullptr;
759 bool IsExternal = false;
760 bool IsNonLocalFunction = false;
763 const GlobalValue *GV = MO.getGlobal();
764 MOSymbol = getSymbol(GV);
765 IsExternal = GV->isDeclaration();
766 IsNonLocalFunction = GV->getType()->getElementType()->isFunctionTy() &&
767 !GV->isStrongDefinitionForLinker();
768 } else if (MO.isCPI())
769 MOSymbol = GetCPISymbol(MO.getIndex());
771 if (IsNonLocalFunction || IsExternal ||
772 TM.getCodeModel() == CodeModel::Large)
773 MOSymbol = lookUpOrCreateTOCEntry(MOSymbol);
776 MCSymbolRefExpr::create(MOSymbol, MCSymbolRefExpr::VK_PPC_TOC_LO,
778 TmpInst.getOperand(2) = MCOperand::createExpr(Exp);
779 EmitToStreamer(*OutStreamer, TmpInst);
782 case PPC::ADDISgotTprelHA: {
783 // Transform: %Xd = ADDISgotTprelHA %X2, <ga:@sym>
784 // Into: %Xd = ADDIS8 %X2, sym@got@tlsgd@ha
785 assert(Subtarget->isPPC64() && "Not supported for 32-bit PowerPC");
786 const MachineOperand &MO = MI->getOperand(2);
787 const GlobalValue *GValue = MO.getGlobal();
788 MCSymbol *MOSymbol = getSymbol(GValue);
789 const MCExpr *SymGotTprel =
790 MCSymbolRefExpr::create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TPREL_HA,
792 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::ADDIS8)
793 .addReg(MI->getOperand(0).getReg())
794 .addReg(MI->getOperand(1).getReg())
795 .addExpr(SymGotTprel));
798 case PPC::LDgotTprelL:
799 case PPC::LDgotTprelL32: {
800 // Transform %Xd = LDgotTprelL <ga:@sym>, %Xs
801 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin);
803 // Change the opcode to LD.
804 TmpInst.setOpcode(isPPC64 ? PPC::LD : PPC::LWZ);
805 const MachineOperand &MO = MI->getOperand(1);
806 const GlobalValue *GValue = MO.getGlobal();
807 MCSymbol *MOSymbol = getSymbol(GValue);
809 MCSymbolRefExpr::create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TPREL_LO,
811 TmpInst.getOperand(1) = MCOperand::createExpr(Exp);
812 EmitToStreamer(*OutStreamer, TmpInst);
816 case PPC::PPC32PICGOT: {
817 MCSymbol *GOTSymbol = OutContext.getOrCreateSymbol(StringRef("_GLOBAL_OFFSET_TABLE_"));
818 MCSymbol *GOTRef = OutContext.createTempSymbol();
819 MCSymbol *NextInstr = OutContext.createTempSymbol();
821 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::BL)
822 // FIXME: We would like an efficient form for this, so we don't have to do
823 // a lot of extra uniquing.
824 .addExpr(MCSymbolRefExpr::create(NextInstr, OutContext)));
825 const MCExpr *OffsExpr =
826 MCBinaryExpr::createSub(MCSymbolRefExpr::create(GOTSymbol, OutContext),
827 MCSymbolRefExpr::create(GOTRef, OutContext),
829 OutStreamer->EmitLabel(GOTRef);
830 OutStreamer->EmitValue(OffsExpr, 4);
831 OutStreamer->EmitLabel(NextInstr);
832 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::MFLR)
833 .addReg(MI->getOperand(0).getReg()));
834 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::LWZ)
835 .addReg(MI->getOperand(1).getReg())
837 .addReg(MI->getOperand(0).getReg()));
838 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::ADD4)
839 .addReg(MI->getOperand(0).getReg())
840 .addReg(MI->getOperand(1).getReg())
841 .addReg(MI->getOperand(0).getReg()));
844 case PPC::PPC32GOT: {
845 MCSymbol *GOTSymbol =
846 OutContext.getOrCreateSymbol(StringRef("_GLOBAL_OFFSET_TABLE_"));
847 const MCExpr *SymGotTlsL = MCSymbolRefExpr::create(
848 GOTSymbol, MCSymbolRefExpr::VK_PPC_LO, OutContext);
849 const MCExpr *SymGotTlsHA = MCSymbolRefExpr::create(
850 GOTSymbol, MCSymbolRefExpr::VK_PPC_HA, OutContext);
851 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::LI)
852 .addReg(MI->getOperand(0).getReg())
853 .addExpr(SymGotTlsL));
854 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::ADDIS)
855 .addReg(MI->getOperand(0).getReg())
856 .addReg(MI->getOperand(0).getReg())
857 .addExpr(SymGotTlsHA));
860 case PPC::ADDIStlsgdHA: {
861 // Transform: %Xd = ADDIStlsgdHA %X2, <ga:@sym>
862 // Into: %Xd = ADDIS8 %X2, sym@got@tlsgd@ha
863 assert(Subtarget->isPPC64() && "Not supported for 32-bit PowerPC");
864 const MachineOperand &MO = MI->getOperand(2);
865 const GlobalValue *GValue = MO.getGlobal();
866 MCSymbol *MOSymbol = getSymbol(GValue);
867 const MCExpr *SymGotTlsGD =
868 MCSymbolRefExpr::create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TLSGD_HA,
870 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::ADDIS8)
871 .addReg(MI->getOperand(0).getReg())
872 .addReg(MI->getOperand(1).getReg())
873 .addExpr(SymGotTlsGD));
876 case PPC::ADDItlsgdL:
877 // Transform: %Xd = ADDItlsgdL %Xs, <ga:@sym>
878 // Into: %Xd = ADDI8 %Xs, sym@got@tlsgd@l
879 case PPC::ADDItlsgdL32: {
880 // Transform: %Rd = ADDItlsgdL32 %Rs, <ga:@sym>
881 // Into: %Rd = ADDI %Rs, sym@got@tlsgd
882 const MachineOperand &MO = MI->getOperand(2);
883 const GlobalValue *GValue = MO.getGlobal();
884 MCSymbol *MOSymbol = getSymbol(GValue);
885 const MCExpr *SymGotTlsGD = MCSymbolRefExpr::create(
886 MOSymbol, Subtarget->isPPC64() ? MCSymbolRefExpr::VK_PPC_GOT_TLSGD_LO
887 : MCSymbolRefExpr::VK_PPC_GOT_TLSGD,
889 EmitToStreamer(*OutStreamer,
890 MCInstBuilder(Subtarget->isPPC64() ? PPC::ADDI8 : PPC::ADDI)
891 .addReg(MI->getOperand(0).getReg())
892 .addReg(MI->getOperand(1).getReg())
893 .addExpr(SymGotTlsGD));
896 case PPC::GETtlsADDR:
897 // Transform: %X3 = GETtlsADDR %X3, <ga:@sym>
898 // Into: BL8_NOP_TLS __tls_get_addr(sym at tlsgd)
899 case PPC::GETtlsADDR32: {
900 // Transform: %R3 = GETtlsADDR32 %R3, <ga:@sym>
901 // Into: BL_TLS __tls_get_addr(sym at tlsgd)@PLT
902 EmitTlsCall(MI, MCSymbolRefExpr::VK_PPC_TLSGD);
905 case PPC::ADDIStlsldHA: {
906 // Transform: %Xd = ADDIStlsldHA %X2, <ga:@sym>
907 // Into: %Xd = ADDIS8 %X2, sym@got@tlsld@ha
908 assert(Subtarget->isPPC64() && "Not supported for 32-bit PowerPC");
909 const MachineOperand &MO = MI->getOperand(2);
910 const GlobalValue *GValue = MO.getGlobal();
911 MCSymbol *MOSymbol = getSymbol(GValue);
912 const MCExpr *SymGotTlsLD =
913 MCSymbolRefExpr::create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TLSLD_HA,
915 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::ADDIS8)
916 .addReg(MI->getOperand(0).getReg())
917 .addReg(MI->getOperand(1).getReg())
918 .addExpr(SymGotTlsLD));
921 case PPC::ADDItlsldL:
922 // Transform: %Xd = ADDItlsldL %Xs, <ga:@sym>
923 // Into: %Xd = ADDI8 %Xs, sym@got@tlsld@l
924 case PPC::ADDItlsldL32: {
925 // Transform: %Rd = ADDItlsldL32 %Rs, <ga:@sym>
926 // Into: %Rd = ADDI %Rs, sym@got@tlsld
927 const MachineOperand &MO = MI->getOperand(2);
928 const GlobalValue *GValue = MO.getGlobal();
929 MCSymbol *MOSymbol = getSymbol(GValue);
930 const MCExpr *SymGotTlsLD = MCSymbolRefExpr::create(
931 MOSymbol, Subtarget->isPPC64() ? MCSymbolRefExpr::VK_PPC_GOT_TLSLD_LO
932 : MCSymbolRefExpr::VK_PPC_GOT_TLSLD,
934 EmitToStreamer(*OutStreamer,
935 MCInstBuilder(Subtarget->isPPC64() ? PPC::ADDI8 : PPC::ADDI)
936 .addReg(MI->getOperand(0).getReg())
937 .addReg(MI->getOperand(1).getReg())
938 .addExpr(SymGotTlsLD));
941 case PPC::GETtlsldADDR:
942 // Transform: %X3 = GETtlsldADDR %X3, <ga:@sym>
943 // Into: BL8_NOP_TLS __tls_get_addr(sym at tlsld)
944 case PPC::GETtlsldADDR32: {
945 // Transform: %R3 = GETtlsldADDR32 %R3, <ga:@sym>
946 // Into: BL_TLS __tls_get_addr(sym at tlsld)@PLT
947 EmitTlsCall(MI, MCSymbolRefExpr::VK_PPC_TLSLD);
950 case PPC::ADDISdtprelHA:
951 // Transform: %Xd = ADDISdtprelHA %Xs, <ga:@sym>
952 // Into: %Xd = ADDIS8 %Xs, sym@dtprel@ha
953 case PPC::ADDISdtprelHA32: {
954 // Transform: %Rd = ADDISdtprelHA32 %Rs, <ga:@sym>
955 // Into: %Rd = ADDIS %Rs, sym@dtprel@ha
956 const MachineOperand &MO = MI->getOperand(2);
957 const GlobalValue *GValue = MO.getGlobal();
958 MCSymbol *MOSymbol = getSymbol(GValue);
959 const MCExpr *SymDtprel =
960 MCSymbolRefExpr::create(MOSymbol, MCSymbolRefExpr::VK_PPC_DTPREL_HA,
964 MCInstBuilder(Subtarget->isPPC64() ? PPC::ADDIS8 : PPC::ADDIS)
965 .addReg(MI->getOperand(0).getReg())
966 .addReg(MI->getOperand(1).getReg())
967 .addExpr(SymDtprel));
970 case PPC::ADDIdtprelL:
971 // Transform: %Xd = ADDIdtprelL %Xs, <ga:@sym>
972 // Into: %Xd = ADDI8 %Xs, sym@dtprel@l
973 case PPC::ADDIdtprelL32: {
974 // Transform: %Rd = ADDIdtprelL32 %Rs, <ga:@sym>
975 // Into: %Rd = ADDI %Rs, sym@dtprel@l
976 const MachineOperand &MO = MI->getOperand(2);
977 const GlobalValue *GValue = MO.getGlobal();
978 MCSymbol *MOSymbol = getSymbol(GValue);
979 const MCExpr *SymDtprel =
980 MCSymbolRefExpr::create(MOSymbol, MCSymbolRefExpr::VK_PPC_DTPREL_LO,
982 EmitToStreamer(*OutStreamer,
983 MCInstBuilder(Subtarget->isPPC64() ? PPC::ADDI8 : PPC::ADDI)
984 .addReg(MI->getOperand(0).getReg())
985 .addReg(MI->getOperand(1).getReg())
986 .addExpr(SymDtprel));
991 if (!Subtarget->hasMFOCRF()) {
992 // Transform: %R3 = MFOCRF %CR7
993 // Into: %R3 = MFCR ;; cr7
995 MI->getOpcode() == PPC::MFOCRF ? PPC::MFCR : PPC::MFCR8;
996 OutStreamer->AddComment(PPCInstPrinter::
997 getRegisterName(MI->getOperand(1).getReg()));
998 EmitToStreamer(*OutStreamer, MCInstBuilder(NewOpcode)
999 .addReg(MI->getOperand(0).getReg()));
1005 if (!Subtarget->hasMFOCRF()) {
1006 // Transform: %CR7 = MTOCRF %R3
1007 // Into: MTCRF mask, %R3 ;; cr7
1008 unsigned NewOpcode =
1009 MI->getOpcode() == PPC::MTOCRF ? PPC::MTCRF : PPC::MTCRF8;
1010 unsigned Mask = 0x80 >> OutContext.getRegisterInfo()
1011 ->getEncodingValue(MI->getOperand(0).getReg());
1012 OutStreamer->AddComment(PPCInstPrinter::
1013 getRegisterName(MI->getOperand(0).getReg()));
1014 EmitToStreamer(*OutStreamer, MCInstBuilder(NewOpcode)
1016 .addReg(MI->getOperand(1).getReg()));
1024 // Verify alignment is legal, so we don't create relocations
1025 // that can't be supported.
1026 // FIXME: This test is currently disabled for Darwin. The test
1027 // suite shows a handful of test cases that fail this check for
1028 // Darwin. Those need to be investigated before this sanity test
1029 // can be enabled for those subtargets.
1030 if (!Subtarget->isDarwin()) {
1031 unsigned OpNum = (MI->getOpcode() == PPC::STD) ? 2 : 1;
1032 const MachineOperand &MO = MI->getOperand(OpNum);
1033 if (MO.isGlobal() && MO.getGlobal()->getAlignment() < 4)
1034 llvm_unreachable("Global must be word-aligned for LD, STD, LWA!");
1036 // Now process the instruction normally.
1041 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin);
1042 EmitToStreamer(*OutStreamer, TmpInst);
1045 void PPCLinuxAsmPrinter::EmitStartOfAsmFile(Module &M) {
1046 if (static_cast<const PPCTargetMachine &>(TM).isELFv2ABI()) {
1047 PPCTargetStreamer *TS =
1048 static_cast<PPCTargetStreamer *>(OutStreamer->getTargetStreamer());
1051 TS->emitAbiVersion(2);
1054 if (static_cast<const PPCTargetMachine &>(TM).isPPC64() ||
1055 TM.getRelocationModel() != Reloc::PIC_)
1056 return AsmPrinter::EmitStartOfAsmFile(M);
1058 if (M.getPICLevel() == PICLevel::Small)
1059 return AsmPrinter::EmitStartOfAsmFile(M);
1061 OutStreamer->SwitchSection(OutContext.getELFSection(
1062 ".got2", ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC));
1064 MCSymbol *TOCSym = OutContext.getOrCreateSymbol(Twine(".LTOC"));
1065 MCSymbol *CurrentPos = OutContext.createTempSymbol();
1067 OutStreamer->EmitLabel(CurrentPos);
1069 // The GOT pointer points to the middle of the GOT, in order to reference the
1070 // entire 64kB range. 0x8000 is the midpoint.
1071 const MCExpr *tocExpr =
1072 MCBinaryExpr::createAdd(MCSymbolRefExpr::create(CurrentPos, OutContext),
1073 MCConstantExpr::create(0x8000, OutContext),
1076 OutStreamer->EmitAssignment(TOCSym, tocExpr);
1078 OutStreamer->SwitchSection(getObjFileLowering().getTextSection());
1081 void PPCLinuxAsmPrinter::EmitFunctionEntryLabel() {
1082 // linux/ppc32 - Normal entry label.
1083 if (!Subtarget->isPPC64() &&
1084 (TM.getRelocationModel() != Reloc::PIC_ ||
1085 MF->getFunction()->getParent()->getPICLevel() == PICLevel::Small))
1086 return AsmPrinter::EmitFunctionEntryLabel();
1088 if (!Subtarget->isPPC64()) {
1089 const PPCFunctionInfo *PPCFI = MF->getInfo<PPCFunctionInfo>();
1090 if (PPCFI->usesPICBase()) {
1091 MCSymbol *RelocSymbol = PPCFI->getPICOffsetSymbol();
1092 MCSymbol *PICBase = MF->getPICBaseSymbol();
1093 OutStreamer->EmitLabel(RelocSymbol);
1095 const MCExpr *OffsExpr =
1096 MCBinaryExpr::createSub(
1097 MCSymbolRefExpr::create(OutContext.getOrCreateSymbol(Twine(".LTOC")),
1099 MCSymbolRefExpr::create(PICBase, OutContext),
1101 OutStreamer->EmitValue(OffsExpr, 4);
1102 OutStreamer->EmitLabel(CurrentFnSym);
1105 return AsmPrinter::EmitFunctionEntryLabel();
1108 // ELFv2 ABI - Normal entry label.
1109 if (Subtarget->isELFv2ABI())
1110 return AsmPrinter::EmitFunctionEntryLabel();
1112 // Emit an official procedure descriptor.
1113 MCSectionSubPair Current = OutStreamer->getCurrentSection();
1114 MCSectionELF *Section = OutStreamer->getContext().getELFSection(
1115 ".opd", ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC);
1116 OutStreamer->SwitchSection(Section);
1117 OutStreamer->EmitLabel(CurrentFnSym);
1118 OutStreamer->EmitValueToAlignment(8);
1119 MCSymbol *Symbol1 = CurrentFnSymForSize;
1120 // Generates a R_PPC64_ADDR64 (from FK_DATA_8) relocation for the function
1122 OutStreamer->EmitValue(MCSymbolRefExpr::create(Symbol1, OutContext),
1124 MCSymbol *Symbol2 = OutContext.getOrCreateSymbol(StringRef(".TOC."));
1125 // Generates a R_PPC64_TOC relocation for TOC base insertion.
1126 OutStreamer->EmitValue(
1127 MCSymbolRefExpr::create(Symbol2, MCSymbolRefExpr::VK_PPC_TOCBASE, OutContext),
1129 // Emit a null environment pointer.
1130 OutStreamer->EmitIntValue(0, 8 /* size */);
1131 OutStreamer->SwitchSection(Current.first, Current.second);
1135 bool PPCLinuxAsmPrinter::doFinalization(Module &M) {
1136 const DataLayout &DL = getDataLayout();
1138 bool isPPC64 = DL.getPointerSizeInBits() == 64;
1140 PPCTargetStreamer &TS =
1141 static_cast<PPCTargetStreamer &>(*OutStreamer->getTargetStreamer());
1144 MCSectionELF *Section;
1147 Section = OutStreamer->getContext().getELFSection(
1148 ".toc", ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC);
1150 Section = OutStreamer->getContext().getELFSection(
1151 ".got2", ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC);
1152 OutStreamer->SwitchSection(Section);
1154 for (MapVector<MCSymbol*, MCSymbol*>::iterator I = TOC.begin(),
1155 E = TOC.end(); I != E; ++I) {
1156 OutStreamer->EmitLabel(I->second);
1157 MCSymbol *S = I->first;
1161 OutStreamer->EmitSymbolValue(S, 4);
1165 return AsmPrinter::doFinalization(M);
1168 /// EmitFunctionBodyStart - Emit a global entry point prefix for ELFv2.
1169 void PPCLinuxAsmPrinter::EmitFunctionBodyStart() {
1170 // In the ELFv2 ABI, in functions that use the TOC register, we need to
1171 // provide two entry points. The ABI guarantees that when calling the
1172 // local entry point, r2 is set up by the caller to contain the TOC base
1173 // for this function, and when calling the global entry point, r12 is set
1174 // up by the caller to hold the address of the global entry point. We
1175 // thus emit a prefix sequence along the following lines:
1178 // # global entry point
1179 // addis r2,r12,(.TOC.-func)@ha
1180 // addi r2,r2,(.TOC.-func)@l
1181 // .localentry func, .-func
1182 // # local entry point, followed by function body
1184 // This ensures we have r2 set up correctly while executing the function
1185 // body, no matter which entry point is called.
1186 if (Subtarget->isELFv2ABI()
1187 // Only do all that if the function uses r2 in the first place.
1188 && !MF->getRegInfo().use_empty(PPC::X2)) {
1190 MCSymbol *GlobalEntryLabel = OutContext.createTempSymbol();
1191 OutStreamer->EmitLabel(GlobalEntryLabel);
1192 const MCSymbolRefExpr *GlobalEntryLabelExp =
1193 MCSymbolRefExpr::create(GlobalEntryLabel, OutContext);
1195 MCSymbol *TOCSymbol = OutContext.getOrCreateSymbol(StringRef(".TOC."));
1196 const MCExpr *TOCDeltaExpr =
1197 MCBinaryExpr::createSub(MCSymbolRefExpr::create(TOCSymbol, OutContext),
1198 GlobalEntryLabelExp, OutContext);
1200 const MCExpr *TOCDeltaHi =
1201 PPCMCExpr::createHa(TOCDeltaExpr, false, OutContext);
1202 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::ADDIS)
1205 .addExpr(TOCDeltaHi));
1207 const MCExpr *TOCDeltaLo =
1208 PPCMCExpr::createLo(TOCDeltaExpr, false, OutContext);
1209 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::ADDI)
1212 .addExpr(TOCDeltaLo));
1214 MCSymbol *LocalEntryLabel = OutContext.createTempSymbol();
1215 OutStreamer->EmitLabel(LocalEntryLabel);
1216 const MCSymbolRefExpr *LocalEntryLabelExp =
1217 MCSymbolRefExpr::create(LocalEntryLabel, OutContext);
1218 const MCExpr *LocalOffsetExp =
1219 MCBinaryExpr::createSub(LocalEntryLabelExp,
1220 GlobalEntryLabelExp, OutContext);
1222 PPCTargetStreamer *TS =
1223 static_cast<PPCTargetStreamer *>(OutStreamer->getTargetStreamer());
1226 TS->emitLocalEntry(cast<MCSymbolELF>(CurrentFnSym), LocalOffsetExp);
1230 /// EmitFunctionBodyEnd - Print the traceback table before the .size
1233 void PPCLinuxAsmPrinter::EmitFunctionBodyEnd() {
1234 // Only the 64-bit target requires a traceback table. For now,
1235 // we only emit the word of zeroes that GDB requires to find
1236 // the end of the function, and zeroes for the eight-byte
1237 // mandatory fields.
1238 // FIXME: We should fill in the eight-byte mandatory fields as described in
1239 // the PPC64 ELF ABI (this is a low-priority item because GDB does not
1240 // currently make use of these fields).
1241 if (Subtarget->isPPC64()) {
1242 OutStreamer->EmitIntValue(0, 4/*size*/);
1243 OutStreamer->EmitIntValue(0, 8/*size*/);
1247 void PPCDarwinAsmPrinter::EmitStartOfAsmFile(Module &M) {
1248 static const char *const CPUDirectives[] = {
1272 // Get the numerically largest directive.
1273 // FIXME: How should we merge darwin directives?
1274 unsigned Directive = PPC::DIR_NONE;
1275 for (const Function &F : M) {
1276 const PPCSubtarget &STI = TM.getSubtarget<PPCSubtarget>(F);
1277 unsigned FDir = STI.getDarwinDirective();
1278 Directive = Directive > FDir ? FDir : STI.getDarwinDirective();
1279 if (STI.hasMFOCRF() && Directive < PPC::DIR_970)
1280 Directive = PPC::DIR_970;
1281 if (STI.hasAltivec() && Directive < PPC::DIR_7400)
1282 Directive = PPC::DIR_7400;
1283 if (STI.isPPC64() && Directive < PPC::DIR_64)
1284 Directive = PPC::DIR_64;
1287 assert(Directive <= PPC::DIR_64 && "Directive out of range.");
1289 assert(Directive < array_lengthof(CPUDirectives) &&
1290 "CPUDirectives[] might not be up-to-date!");
1291 PPCTargetStreamer &TStreamer =
1292 *static_cast<PPCTargetStreamer *>(OutStreamer->getTargetStreamer());
1293 TStreamer.emitMachine(CPUDirectives[Directive]);
1295 // Prime text sections so they are adjacent. This reduces the likelihood a
1296 // large data or debug section causes a branch to exceed 16M limit.
1297 const TargetLoweringObjectFileMachO &TLOFMacho =
1298 static_cast<const TargetLoweringObjectFileMachO &>(getObjFileLowering());
1299 OutStreamer->SwitchSection(TLOFMacho.getTextCoalSection());
1300 if (TM.getRelocationModel() == Reloc::PIC_) {
1301 OutStreamer->SwitchSection(
1302 OutContext.getMachOSection("__TEXT", "__picsymbolstub1",
1303 MachO::S_SYMBOL_STUBS |
1304 MachO::S_ATTR_PURE_INSTRUCTIONS,
1305 32, SectionKind::getText()));
1306 } else if (TM.getRelocationModel() == Reloc::DynamicNoPIC) {
1307 OutStreamer->SwitchSection(
1308 OutContext.getMachOSection("__TEXT","__symbol_stub1",
1309 MachO::S_SYMBOL_STUBS |
1310 MachO::S_ATTR_PURE_INSTRUCTIONS,
1311 16, SectionKind::getText()));
1313 OutStreamer->SwitchSection(getObjFileLowering().getTextSection());
1316 static MCSymbol *GetLazyPtr(MCSymbol *Sym, MCContext &Ctx) {
1317 // Remove $stub suffix, add $lazy_ptr.
1318 StringRef NoStub = Sym->getName().substr(0, Sym->getName().size()-5);
1319 return Ctx.getOrCreateSymbol(NoStub + "$lazy_ptr");
1322 static MCSymbol *GetAnonSym(MCSymbol *Sym, MCContext &Ctx) {
1323 // Add $tmp suffix to $stub, yielding $stub$tmp.
1324 return Ctx.getOrCreateSymbol(Sym->getName() + "$tmp");
1327 void PPCDarwinAsmPrinter::
1328 EmitFunctionStubs(const MachineModuleInfoMachO::SymbolListTy &Stubs) {
1329 bool isPPC64 = getDataLayout().getPointerSizeInBits() == 64;
1331 // Construct a local MCSubtargetInfo and shadow EmitToStreamer here.
1332 // This is because the MachineFunction won't exist (but have not yet been
1333 // freed) and since we're at the global level we can use the default
1334 // constructed subtarget.
1335 std::unique_ptr<MCSubtargetInfo> STI(TM.getTarget().createMCSubtargetInfo(
1336 TM.getTargetTriple().str(), TM.getTargetCPU(),
1337 TM.getTargetFeatureString()));
1338 auto EmitToStreamer = [&STI] (MCStreamer &S, const MCInst &Inst) {
1339 S.EmitInstruction(Inst, *STI);
1342 const TargetLoweringObjectFileMachO &TLOFMacho =
1343 static_cast<const TargetLoweringObjectFileMachO &>(getObjFileLowering());
1345 // .lazy_symbol_pointer
1346 MCSection *LSPSection = TLOFMacho.getLazySymbolPointerSection();
1348 // Output stubs for dynamically-linked functions
1349 if (TM.getRelocationModel() == Reloc::PIC_) {
1350 MCSection *StubSection = OutContext.getMachOSection(
1351 "__TEXT", "__picsymbolstub1",
1352 MachO::S_SYMBOL_STUBS | MachO::S_ATTR_PURE_INSTRUCTIONS, 32,
1353 SectionKind::getText());
1354 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
1355 OutStreamer->SwitchSection(StubSection);
1358 MCSymbol *Stub = Stubs[i].first;
1359 MCSymbol *RawSym = Stubs[i].second.getPointer();
1360 MCSymbol *LazyPtr = GetLazyPtr(Stub, OutContext);
1361 MCSymbol *AnonSymbol = GetAnonSym(Stub, OutContext);
1363 OutStreamer->EmitLabel(Stub);
1364 OutStreamer->EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
1366 const MCExpr *Anon = MCSymbolRefExpr::create(AnonSymbol, OutContext);
1367 const MCExpr *LazyPtrExpr = MCSymbolRefExpr::create(LazyPtr, OutContext);
1369 MCBinaryExpr::createSub(LazyPtrExpr, Anon, OutContext);
1372 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::MFLR).addReg(PPC::R0));
1373 // bcl 20, 31, AnonSymbol
1374 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::BCLalways).addExpr(Anon));
1375 OutStreamer->EmitLabel(AnonSymbol);
1377 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::MFLR).addReg(PPC::R11));
1378 // addis r11, r11, ha16(LazyPtr - AnonSymbol)
1379 const MCExpr *SubHa16 = PPCMCExpr::createHa(Sub, true, OutContext);
1380 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::ADDIS)
1385 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::MTLR).addReg(PPC::R0));
1387 // ldu r12, lo16(LazyPtr - AnonSymbol)(r11)
1388 // lwzu r12, lo16(LazyPtr - AnonSymbol)(r11)
1389 const MCExpr *SubLo16 = PPCMCExpr::createLo(Sub, true, OutContext);
1390 EmitToStreamer(*OutStreamer, MCInstBuilder(isPPC64 ? PPC::LDU : PPC::LWZU)
1392 .addExpr(SubLo16).addExpr(SubLo16)
1395 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::MTCTR).addReg(PPC::R12));
1397 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::BCTR));
1399 OutStreamer->SwitchSection(LSPSection);
1400 OutStreamer->EmitLabel(LazyPtr);
1401 OutStreamer->EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
1403 MCSymbol *DyldStubBindingHelper =
1404 OutContext.getOrCreateSymbol(StringRef("dyld_stub_binding_helper"));
1406 // .quad dyld_stub_binding_helper
1407 OutStreamer->EmitSymbolValue(DyldStubBindingHelper, 8);
1409 // .long dyld_stub_binding_helper
1410 OutStreamer->EmitSymbolValue(DyldStubBindingHelper, 4);
1413 OutStreamer->AddBlankLine();
1417 MCSection *StubSection = OutContext.getMachOSection(
1418 "__TEXT", "__symbol_stub1",
1419 MachO::S_SYMBOL_STUBS | MachO::S_ATTR_PURE_INSTRUCTIONS, 16,
1420 SectionKind::getText());
1421 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
1422 MCSymbol *Stub = Stubs[i].first;
1423 MCSymbol *RawSym = Stubs[i].second.getPointer();
1424 MCSymbol *LazyPtr = GetLazyPtr(Stub, OutContext);
1425 const MCExpr *LazyPtrExpr = MCSymbolRefExpr::create(LazyPtr, OutContext);
1427 OutStreamer->SwitchSection(StubSection);
1429 OutStreamer->EmitLabel(Stub);
1430 OutStreamer->EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
1432 // lis r11, ha16(LazyPtr)
1433 const MCExpr *LazyPtrHa16 =
1434 PPCMCExpr::createHa(LazyPtrExpr, true, OutContext);
1435 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::LIS)
1437 .addExpr(LazyPtrHa16));
1439 // ldu r12, lo16(LazyPtr)(r11)
1440 // lwzu r12, lo16(LazyPtr)(r11)
1441 const MCExpr *LazyPtrLo16 =
1442 PPCMCExpr::createLo(LazyPtrExpr, true, OutContext);
1443 EmitToStreamer(*OutStreamer, MCInstBuilder(isPPC64 ? PPC::LDU : PPC::LWZU)
1445 .addExpr(LazyPtrLo16).addExpr(LazyPtrLo16)
1449 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::MTCTR).addReg(PPC::R12));
1451 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::BCTR));
1453 OutStreamer->SwitchSection(LSPSection);
1454 OutStreamer->EmitLabel(LazyPtr);
1455 OutStreamer->EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
1457 MCSymbol *DyldStubBindingHelper =
1458 OutContext.getOrCreateSymbol(StringRef("dyld_stub_binding_helper"));
1460 // .quad dyld_stub_binding_helper
1461 OutStreamer->EmitSymbolValue(DyldStubBindingHelper, 8);
1463 // .long dyld_stub_binding_helper
1464 OutStreamer->EmitSymbolValue(DyldStubBindingHelper, 4);
1468 OutStreamer->AddBlankLine();
1472 bool PPCDarwinAsmPrinter::doFinalization(Module &M) {
1473 bool isPPC64 = getDataLayout().getPointerSizeInBits() == 64;
1475 // Darwin/PPC always uses mach-o.
1476 const TargetLoweringObjectFileMachO &TLOFMacho =
1477 static_cast<const TargetLoweringObjectFileMachO &>(getObjFileLowering());
1478 MachineModuleInfoMachO &MMIMacho =
1479 MMI->getObjFileInfo<MachineModuleInfoMachO>();
1481 MachineModuleInfoMachO::SymbolListTy Stubs = MMIMacho.GetFnStubList();
1483 EmitFunctionStubs(Stubs);
1485 if (MAI->doesSupportExceptionHandling() && MMI) {
1486 // Add the (possibly multiple) personalities to the set of global values.
1487 // Only referenced functions get into the Personalities list.
1488 for (const Function *Personality : MMI->getPersonalities()) {
1491 getSymbolWithGlobalValueBase(Personality, "$non_lazy_ptr");
1492 MachineModuleInfoImpl::StubValueTy &StubSym =
1493 MMIMacho.getGVStubEntry(NLPSym);
1495 MachineModuleInfoImpl::StubValueTy(getSymbol(Personality), true);
1500 // Output stubs for dynamically-linked functions.
1501 Stubs = MMIMacho.GetGVStubList();
1503 // Output macho stubs for external and common global variables.
1504 if (!Stubs.empty()) {
1505 // Switch with ".non_lazy_symbol_pointer" directive.
1506 OutStreamer->SwitchSection(TLOFMacho.getNonLazySymbolPointerSection());
1507 EmitAlignment(isPPC64 ? 3 : 2);
1509 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
1511 OutStreamer->EmitLabel(Stubs[i].first);
1512 // .indirect_symbol _foo
1513 MachineModuleInfoImpl::StubValueTy &MCSym = Stubs[i].second;
1514 OutStreamer->EmitSymbolAttribute(MCSym.getPointer(), MCSA_IndirectSymbol);
1517 // External to current translation unit.
1518 OutStreamer->EmitIntValue(0, isPPC64 ? 8 : 4/*size*/);
1520 // Internal to current translation unit.
1522 // When we place the LSDA into the TEXT section, the type info pointers
1523 // need to be indirect and pc-rel. We accomplish this by using NLPs.
1524 // However, sometimes the types are local to the file. So we need to
1525 // fill in the value for the NLP in those cases.
1526 OutStreamer->EmitValue(MCSymbolRefExpr::create(MCSym.getPointer(),
1528 isPPC64 ? 8 : 4/*size*/);
1532 OutStreamer->AddBlankLine();
1535 Stubs = MMIMacho.GetHiddenGVStubList();
1536 if (!Stubs.empty()) {
1537 OutStreamer->SwitchSection(getObjFileLowering().getDataSection());
1538 EmitAlignment(isPPC64 ? 3 : 2);
1540 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
1542 OutStreamer->EmitLabel(Stubs[i].first);
1544 OutStreamer->EmitValue(MCSymbolRefExpr::
1545 create(Stubs[i].second.getPointer(),
1547 isPPC64 ? 8 : 4/*size*/);
1551 OutStreamer->AddBlankLine();
1554 // Funny Darwin hack: This flag tells the linker that no global symbols
1555 // contain code that falls through to other global symbols (e.g. the obvious
1556 // implementation of multiple entry points). If this doesn't occur, the
1557 // linker can safely perform dead code stripping. Since LLVM never generates
1558 // code that does this, it is always safe to set.
1559 OutStreamer->EmitAssemblerFlag(MCAF_SubsectionsViaSymbols);
1561 return AsmPrinter::doFinalization(M);
1564 /// createPPCAsmPrinterPass - Returns a pass that prints the PPC assembly code
1565 /// for a MachineFunction to the given output stream, in a format that the
1566 /// Darwin assembler can deal with.
1569 createPPCAsmPrinterPass(TargetMachine &tm,
1570 std::unique_ptr<MCStreamer> &&Streamer) {
1571 if (tm.getTargetTriple().isMacOSX())
1572 return new PPCDarwinAsmPrinter(tm, std::move(Streamer));
1573 return new PPCLinuxAsmPrinter(tm, std::move(Streamer));
1576 // Force static initialization.
1577 extern "C" void LLVMInitializePowerPCAsmPrinter() {
1578 TargetRegistry::RegisterAsmPrinter(ThePPC32Target, createPPCAsmPrinterPass);
1579 TargetRegistry::RegisterAsmPrinter(ThePPC64Target, createPPCAsmPrinterPass);
1580 TargetRegistry::RegisterAsmPrinter(ThePPC64LETarget, createPPCAsmPrinterPass);