1 //===-- PPCAsmPrinter.cpp - Print machine instrs to PowerPC assembly ------===//
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7 //===----------------------------------------------------------------------===//
9 // This file contains a printer that converts from our internal representation
10 // of machine-dependent LLVM code to PowerPC assembly language. This printer is
11 // the output mechanism used by `llc'.
13 // Documentation at http://developer.apple.com/documentation/DeveloperTools/
14 // Reference/Assembler/ASMIntroduction/chapter_1_section_1.html
16 //===----------------------------------------------------------------------===//
18 #include "MCTargetDesc/PPCInstPrinter.h"
19 #include "MCTargetDesc/PPCMCExpr.h"
20 #include "MCTargetDesc/PPCMCTargetDesc.h"
21 #include "MCTargetDesc/PPCPredicates.h"
23 #include "PPCInstrInfo.h"
24 #include "PPCMachineFunctionInfo.h"
25 #include "PPCSubtarget.h"
26 #include "PPCTargetMachine.h"
27 #include "PPCTargetStreamer.h"
28 #include "TargetInfo/PowerPCTargetInfo.h"
29 #include "llvm/ADT/MapVector.h"
30 #include "llvm/ADT/StringRef.h"
31 #include "llvm/ADT/Triple.h"
32 #include "llvm/ADT/Twine.h"
33 #include "llvm/BinaryFormat/ELF.h"
34 #include "llvm/BinaryFormat/MachO.h"
35 #include "llvm/CodeGen/AsmPrinter.h"
36 #include "llvm/CodeGen/MachineBasicBlock.h"
37 #include "llvm/CodeGen/MachineFunction.h"
38 #include "llvm/CodeGen/MachineInstr.h"
39 #include "llvm/CodeGen/MachineModuleInfoImpls.h"
40 #include "llvm/CodeGen/MachineOperand.h"
41 #include "llvm/CodeGen/MachineRegisterInfo.h"
42 #include "llvm/CodeGen/StackMaps.h"
43 #include "llvm/CodeGen/TargetLoweringObjectFileImpl.h"
44 #include "llvm/IR/DataLayout.h"
45 #include "llvm/IR/GlobalValue.h"
46 #include "llvm/IR/GlobalVariable.h"
47 #include "llvm/IR/Module.h"
48 #include "llvm/MC/MCAsmInfo.h"
49 #include "llvm/MC/MCContext.h"
50 #include "llvm/MC/MCExpr.h"
51 #include "llvm/MC/MCInst.h"
52 #include "llvm/MC/MCInstBuilder.h"
53 #include "llvm/MC/MCSectionELF.h"
54 #include "llvm/MC/MCSectionMachO.h"
55 #include "llvm/MC/MCSectionXCOFF.h"
56 #include "llvm/MC/MCStreamer.h"
57 #include "llvm/MC/MCSymbol.h"
58 #include "llvm/MC/MCSymbolELF.h"
59 #include "llvm/MC/MCSymbolXCOFF.h"
60 #include "llvm/MC/SectionKind.h"
61 #include "llvm/Support/Casting.h"
62 #include "llvm/Support/CodeGen.h"
63 #include "llvm/Support/Debug.h"
64 #include "llvm/Support/ErrorHandling.h"
65 #include "llvm/Support/TargetRegistry.h"
66 #include "llvm/Support/raw_ostream.h"
67 #include "llvm/Target/TargetMachine.h"
76 #define DEBUG_TYPE "asmprinter"
80 class PPCAsmPrinter : public AsmPrinter {
82 MapVector<const MCSymbol *, MCSymbol *> TOC;
83 const PPCSubtarget *Subtarget = nullptr;
86 virtual MCSymbol *getMCSymbolForTOCPseudoMO(const MachineOperand &MO);
89 explicit PPCAsmPrinter(TargetMachine &TM,
90 std::unique_ptr<MCStreamer> Streamer)
91 : AsmPrinter(TM, std::move(Streamer)), SM(*this) {}
93 StringRef getPassName() const override { return "PowerPC Assembly Printer"; }
95 MCSymbol *lookUpOrCreateTOCEntry(const MCSymbol *Sym);
97 bool doInitialization(Module &M) override {
100 return AsmPrinter::doInitialization(M);
103 void EmitInstruction(const MachineInstr *MI) override;
105 /// This function is for PrintAsmOperand and PrintAsmMemoryOperand,
106 /// invoked by EmitMSInlineAsmStr and EmitGCCInlineAsmStr only.
107 /// The \p MI would be INLINEASM ONLY.
108 void printOperand(const MachineInstr *MI, unsigned OpNo, raw_ostream &O);
110 void PrintSymbolOperand(const MachineOperand &MO, raw_ostream &O) override;
111 bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
112 const char *ExtraCode, raw_ostream &O) override;
113 bool PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
114 const char *ExtraCode, raw_ostream &O) override;
116 void EmitEndOfAsmFile(Module &M) override;
118 void LowerSTACKMAP(StackMaps &SM, const MachineInstr &MI);
119 void LowerPATCHPOINT(StackMaps &SM, const MachineInstr &MI);
120 void EmitTlsCall(const MachineInstr *MI, MCSymbolRefExpr::VariantKind VK);
121 bool runOnMachineFunction(MachineFunction &MF) override {
122 Subtarget = &MF.getSubtarget<PPCSubtarget>();
123 bool Changed = AsmPrinter::runOnMachineFunction(MF);
129 /// PPCLinuxAsmPrinter - PowerPC assembly printer, customized for Linux
130 class PPCLinuxAsmPrinter : public PPCAsmPrinter {
132 explicit PPCLinuxAsmPrinter(TargetMachine &TM,
133 std::unique_ptr<MCStreamer> Streamer)
134 : PPCAsmPrinter(TM, std::move(Streamer)) {}
136 StringRef getPassName() const override {
137 return "Linux PPC Assembly Printer";
140 bool doFinalization(Module &M) override;
141 void EmitStartOfAsmFile(Module &M) override;
143 void EmitFunctionEntryLabel() override;
145 void EmitFunctionBodyStart() override;
146 void EmitFunctionBodyEnd() override;
147 void EmitInstruction(const MachineInstr *MI) override;
150 class PPCAIXAsmPrinter : public PPCAsmPrinter {
152 static void ValidateGV(const GlobalVariable *GV);
154 MCSymbol *getMCSymbolForTOCPseudoMO(const MachineOperand &MO) override;
157 PPCAIXAsmPrinter(TargetMachine &TM, std::unique_ptr<MCStreamer> Streamer)
158 : PPCAsmPrinter(TM, std::move(Streamer)) {}
160 StringRef getPassName() const override { return "AIX PPC Assembly Printer"; }
162 void SetupMachineFunction(MachineFunction &MF) override;
164 const MCExpr *lowerConstant(const Constant *CV) override;
166 void EmitGlobalVariable(const GlobalVariable *GV) override;
168 void EmitFunctionDescriptor() override;
170 void EmitEndOfAsmFile(Module &) override;
173 } // end anonymous namespace
175 void PPCAsmPrinter::PrintSymbolOperand(const MachineOperand &MO,
177 // Computing the address of a global symbol, not calling it.
178 const GlobalValue *GV = MO.getGlobal();
179 MCSymbol *SymToPrint;
181 // External or weakly linked global variables need non-lazily-resolved stubs
182 if (Subtarget->hasLazyResolverStub(GV)) {
183 SymToPrint = getSymbolWithGlobalValueBase(GV, "$non_lazy_ptr");
184 MachineModuleInfoImpl::StubValueTy &StubSym =
185 MMI->getObjFileInfo<MachineModuleInfoMachO>().getGVStubEntry(
187 if (!StubSym.getPointer())
188 StubSym = MachineModuleInfoImpl::StubValueTy(getSymbol(GV),
189 !GV->hasInternalLinkage());
191 SymToPrint = getSymbol(GV);
194 SymToPrint->print(O, MAI);
196 printOffset(MO.getOffset(), O);
199 void PPCAsmPrinter::printOperand(const MachineInstr *MI, unsigned OpNo,
201 const DataLayout &DL = getDataLayout();
202 const MachineOperand &MO = MI->getOperand(OpNo);
204 switch (MO.getType()) {
205 case MachineOperand::MO_Register: {
206 // The MI is INLINEASM ONLY and UseVSXReg is always false.
207 const char *RegName = PPCInstPrinter::getRegisterName(MO.getReg());
209 // Linux assembler (Others?) does not take register mnemonics.
210 // FIXME - What about special registers used in mfspr/mtspr?
211 if (!Subtarget->isDarwin())
212 RegName = PPCRegisterInfo::stripRegisterPrefix(RegName);
216 case MachineOperand::MO_Immediate:
220 case MachineOperand::MO_MachineBasicBlock:
221 MO.getMBB()->getSymbol()->print(O, MAI);
223 case MachineOperand::MO_ConstantPoolIndex:
224 O << DL.getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << '_'
227 case MachineOperand::MO_BlockAddress:
228 GetBlockAddressSymbol(MO.getBlockAddress())->print(O, MAI);
230 case MachineOperand::MO_GlobalAddress: {
231 PrintSymbolOperand(MO, O);
236 O << "<unknown operand type: " << (unsigned)MO.getType() << ">";
241 /// PrintAsmOperand - Print out an operand for an inline asm expression.
243 bool PPCAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
244 const char *ExtraCode, raw_ostream &O) {
245 // Does this asm operand have a single letter operand modifier?
246 if (ExtraCode && ExtraCode[0]) {
247 if (ExtraCode[1] != 0) return true; // Unknown modifier.
249 switch (ExtraCode[0]) {
251 // See if this is a generic print operand
252 return AsmPrinter::PrintAsmOperand(MI, OpNo, ExtraCode, O);
253 case 'L': // Write second word of DImode reference.
254 // Verify that this operand has two consecutive registers.
255 if (!MI->getOperand(OpNo).isReg() ||
256 OpNo+1 == MI->getNumOperands() ||
257 !MI->getOperand(OpNo+1).isReg())
259 ++OpNo; // Return the high-part.
262 // Write 'i' if an integer constant, otherwise nothing. Used to print
264 if (MI->getOperand(OpNo).isImm())
268 if(!MI->getOperand(OpNo).isReg())
270 // This operand uses VSX numbering.
271 // If the operand is a VMX register, convert it to a VSX register.
272 Register Reg = MI->getOperand(OpNo).getReg();
273 if (PPCInstrInfo::isVRRegister(Reg))
274 Reg = PPC::VSX32 + (Reg - PPC::V0);
275 else if (PPCInstrInfo::isVFRegister(Reg))
276 Reg = PPC::VSX32 + (Reg - PPC::VF0);
278 RegName = PPCInstPrinter::getRegisterName(Reg);
279 RegName = PPCRegisterInfo::stripRegisterPrefix(RegName);
285 printOperand(MI, OpNo, O);
289 // At the moment, all inline asm memory operands are a single register.
290 // In any case, the output of this routine should always be just one
291 // assembler operand.
293 bool PPCAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
294 const char *ExtraCode,
296 if (ExtraCode && ExtraCode[0]) {
297 if (ExtraCode[1] != 0) return true; // Unknown modifier.
299 switch (ExtraCode[0]) {
300 default: return true; // Unknown modifier.
301 case 'y': // A memory reference for an X-form instruction
303 const char *RegName = "r0";
304 if (!Subtarget->isDarwin())
305 RegName = PPCRegisterInfo::stripRegisterPrefix(RegName);
306 O << RegName << ", ";
307 printOperand(MI, OpNo, O);
310 case 'U': // Print 'u' for update form.
311 case 'X': // Print 'x' for indexed form.
313 // FIXME: Currently for PowerPC memory operands are always loaded
314 // into a register, so we never get an update or indexed form.
315 // This is bad even for offset forms, since even if we know we
316 // have a value in -16(r1), we will generate a load into r<n>
317 // and then load from 0(r<n>). Until that issue is fixed,
318 // tolerate 'U' and 'X' but don't output anything.
319 assert(MI->getOperand(OpNo).isReg());
325 assert(MI->getOperand(OpNo).isReg());
327 printOperand(MI, OpNo, O);
332 /// lookUpOrCreateTOCEntry -- Given a symbol, look up whether a TOC entry
333 /// exists for it. If not, create one. Then return a symbol that references
335 MCSymbol *PPCAsmPrinter::lookUpOrCreateTOCEntry(const MCSymbol *Sym) {
336 MCSymbol *&TOCEntry = TOC[Sym];
338 TOCEntry = createTempSymbol("C");
342 void PPCAsmPrinter::EmitEndOfAsmFile(Module &M) {
346 void PPCAsmPrinter::LowerSTACKMAP(StackMaps &SM, const MachineInstr &MI) {
347 unsigned NumNOPBytes = MI.getOperand(1).getImm();
349 auto &Ctx = OutStreamer->getContext();
350 MCSymbol *MILabel = Ctx.createTempSymbol();
351 OutStreamer->EmitLabel(MILabel);
353 SM.recordStackMap(*MILabel, MI);
354 assert(NumNOPBytes % 4 == 0 && "Invalid number of NOP bytes requested!");
356 // Scan ahead to trim the shadow.
357 const MachineBasicBlock &MBB = *MI.getParent();
358 MachineBasicBlock::const_iterator MII(MI);
360 while (NumNOPBytes > 0) {
361 if (MII == MBB.end() || MII->isCall() ||
362 MII->getOpcode() == PPC::DBG_VALUE ||
363 MII->getOpcode() == TargetOpcode::PATCHPOINT ||
364 MII->getOpcode() == TargetOpcode::STACKMAP)
371 for (unsigned i = 0; i < NumNOPBytes; i += 4)
372 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::NOP));
375 // Lower a patchpoint of the form:
376 // [<def>], <id>, <numBytes>, <target>, <numArgs>
377 void PPCAsmPrinter::LowerPATCHPOINT(StackMaps &SM, const MachineInstr &MI) {
378 auto &Ctx = OutStreamer->getContext();
379 MCSymbol *MILabel = Ctx.createTempSymbol();
380 OutStreamer->EmitLabel(MILabel);
382 SM.recordPatchPoint(*MILabel, MI);
383 PatchPointOpers Opers(&MI);
385 unsigned EncodedBytes = 0;
386 const MachineOperand &CalleeMO = Opers.getCallTarget();
388 if (CalleeMO.isImm()) {
389 int64_t CallTarget = CalleeMO.getImm();
391 assert((CallTarget & 0xFFFFFFFFFFFF) == CallTarget &&
392 "High 16 bits of call target should be zero.");
393 Register ScratchReg = MI.getOperand(Opers.getNextScratchIdx()).getReg();
395 // Materialize the jump address:
396 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::LI8)
398 .addImm((CallTarget >> 32) & 0xFFFF));
400 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::RLDIC)
403 .addImm(32).addImm(16));
405 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::ORIS8)
408 .addImm((CallTarget >> 16) & 0xFFFF));
410 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::ORI8)
413 .addImm(CallTarget & 0xFFFF));
415 // Save the current TOC pointer before the remote call.
416 int TOCSaveOffset = Subtarget->getFrameLowering()->getTOCSaveOffset();
417 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::STD)
419 .addImm(TOCSaveOffset)
423 // If we're on ELFv1, then we need to load the actual function pointer
424 // from the function descriptor.
425 if (!Subtarget->isELFv2ABI()) {
426 // Load the new TOC pointer and the function address, but not r11
427 // (needing this is rare, and loading it here would prevent passing it
428 // via a 'nest' parameter.
429 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::LD)
432 .addReg(ScratchReg));
434 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::LD)
437 .addReg(ScratchReg));
441 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::MTCTR8)
442 .addReg(ScratchReg));
444 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::BCTRL8));
447 // Restore the TOC pointer after the call.
448 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::LD)
450 .addImm(TOCSaveOffset)
454 } else if (CalleeMO.isGlobal()) {
455 const GlobalValue *GValue = CalleeMO.getGlobal();
456 MCSymbol *MOSymbol = getSymbol(GValue);
457 const MCExpr *SymVar = MCSymbolRefExpr::create(MOSymbol, OutContext);
459 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::BL8_NOP)
464 // Each instruction is 4 bytes.
468 unsigned NumBytes = Opers.getNumPatchBytes();
469 assert(NumBytes >= EncodedBytes &&
470 "Patchpoint can't request size less than the length of a call.");
471 assert((NumBytes - EncodedBytes) % 4 == 0 &&
472 "Invalid number of NOP bytes requested!");
473 for (unsigned i = EncodedBytes; i < NumBytes; i += 4)
474 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::NOP));
477 /// EmitTlsCall -- Given a GETtls[ld]ADDR[32] instruction, print a
478 /// call to __tls_get_addr to the current output stream.
479 void PPCAsmPrinter::EmitTlsCall(const MachineInstr *MI,
480 MCSymbolRefExpr::VariantKind VK) {
481 StringRef Name = "__tls_get_addr";
482 MCSymbol *TlsGetAddr = OutContext.getOrCreateSymbol(Name);
483 MCSymbolRefExpr::VariantKind Kind = MCSymbolRefExpr::VK_None;
484 const Module *M = MF->getFunction().getParent();
486 assert(MI->getOperand(0).isReg() &&
487 ((Subtarget->isPPC64() && MI->getOperand(0).getReg() == PPC::X3) ||
488 (!Subtarget->isPPC64() && MI->getOperand(0).getReg() == PPC::R3)) &&
489 "GETtls[ld]ADDR[32] must define GPR3");
490 assert(MI->getOperand(1).isReg() &&
491 ((Subtarget->isPPC64() && MI->getOperand(1).getReg() == PPC::X3) ||
492 (!Subtarget->isPPC64() && MI->getOperand(1).getReg() == PPC::R3)) &&
493 "GETtls[ld]ADDR[32] must read GPR3");
495 if (Subtarget->is32BitELFABI() && isPositionIndependent())
496 Kind = MCSymbolRefExpr::VK_PLT;
498 const MCExpr *TlsRef =
499 MCSymbolRefExpr::create(TlsGetAddr, Kind, OutContext);
501 // Add 32768 offset to the symbol so we follow up the latest GOT/PLT ABI.
502 if (Kind == MCSymbolRefExpr::VK_PLT && Subtarget->isSecurePlt() &&
503 M->getPICLevel() == PICLevel::BigPIC)
504 TlsRef = MCBinaryExpr::createAdd(
505 TlsRef, MCConstantExpr::create(32768, OutContext), OutContext);
506 const MachineOperand &MO = MI->getOperand(2);
507 const GlobalValue *GValue = MO.getGlobal();
508 MCSymbol *MOSymbol = getSymbol(GValue);
509 const MCExpr *SymVar = MCSymbolRefExpr::create(MOSymbol, VK, OutContext);
510 EmitToStreamer(*OutStreamer,
511 MCInstBuilder(Subtarget->isPPC64() ?
512 PPC::BL8_NOP_TLS : PPC::BL_TLS)
517 /// Map a machine operand for a TOC pseudo-machine instruction to its
518 /// corresponding MCSymbol.
519 MCSymbol *PPCAsmPrinter::getMCSymbolForTOCPseudoMO(const MachineOperand &MO) {
520 switch (MO.getType()) {
521 case MachineOperand::MO_GlobalAddress:
522 return getSymbol(MO.getGlobal());
523 case MachineOperand::MO_ConstantPoolIndex:
524 return GetCPISymbol(MO.getIndex());
525 case MachineOperand::MO_JumpTableIndex:
526 return GetJTISymbol(MO.getIndex());
527 case MachineOperand::MO_BlockAddress:
528 return GetBlockAddressSymbol(MO.getBlockAddress());
530 llvm_unreachable("Unexpected operand type to get symbol.");
534 /// EmitInstruction -- Print out a single PowerPC MI in Darwin syntax to
535 /// the current output stream.
537 void PPCAsmPrinter::EmitInstruction(const MachineInstr *MI) {
539 const bool IsDarwin = TM.getTargetTriple().isOSDarwin();
540 const bool IsPPC64 = Subtarget->isPPC64();
541 const bool IsAIX = Subtarget->isAIXABI();
542 const Module *M = MF->getFunction().getParent();
543 PICLevel::Level PL = M->getPICLevel();
546 // Validate that SPE and FPU are mutually exclusive in codegen
547 if (!MI->isInlineAsm()) {
548 for (const MachineOperand &MO: MI->operands()) {
550 Register Reg = MO.getReg();
551 if (Subtarget->hasSPE()) {
552 if (PPC::F4RCRegClass.contains(Reg) ||
553 PPC::F8RCRegClass.contains(Reg) ||
554 PPC::QBRCRegClass.contains(Reg) ||
555 PPC::QFRCRegClass.contains(Reg) ||
556 PPC::QSRCRegClass.contains(Reg) ||
557 PPC::VFRCRegClass.contains(Reg) ||
558 PPC::VRRCRegClass.contains(Reg) ||
559 PPC::VSFRCRegClass.contains(Reg) ||
560 PPC::VSSRCRegClass.contains(Reg)
562 llvm_unreachable("SPE targets cannot have FPRegs!");
564 if (PPC::SPERCRegClass.contains(Reg))
565 llvm_unreachable("SPE register found in FPU-targeted code!");
571 // Lower multi-instruction pseudo operations.
572 switch (MI->getOpcode()) {
574 case TargetOpcode::DBG_VALUE:
575 llvm_unreachable("Should be handled target independently");
576 case TargetOpcode::STACKMAP:
577 return LowerSTACKMAP(SM, *MI);
578 case TargetOpcode::PATCHPOINT:
579 return LowerPATCHPOINT(SM, *MI);
581 case PPC::MoveGOTtoLR: {
582 // Transform %lr = MoveGOTtoLR
583 // Into this: bl _GLOBAL_OFFSET_TABLE_@local-4
584 // _GLOBAL_OFFSET_TABLE_@local-4 (instruction preceding
585 // _GLOBAL_OFFSET_TABLE_) has exactly one instruction:
587 // This will return the pointer to _GLOBAL_OFFSET_TABLE_@local
588 MCSymbol *GOTSymbol =
589 OutContext.getOrCreateSymbol(StringRef("_GLOBAL_OFFSET_TABLE_"));
590 const MCExpr *OffsExpr =
591 MCBinaryExpr::createSub(MCSymbolRefExpr::create(GOTSymbol,
592 MCSymbolRefExpr::VK_PPC_LOCAL,
594 MCConstantExpr::create(4, OutContext),
598 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::BL).addExpr(OffsExpr));
601 case PPC::MovePCtoLR:
602 case PPC::MovePCtoLR8: {
603 // Transform %lr = MovePCtoLR
604 // Into this, where the label is the PIC base:
607 MCSymbol *PICBase = MF->getPICBaseSymbol();
610 EmitToStreamer(*OutStreamer,
611 MCInstBuilder(PPC::BL)
612 // FIXME: We would like an efficient form for this, so we
613 // don't have to do a lot of extra uniquing.
614 .addExpr(MCSymbolRefExpr::create(PICBase, OutContext)));
617 OutStreamer->EmitLabel(PICBase);
620 case PPC::UpdateGBR: {
621 // Transform %rd = UpdateGBR(%rt, %ri)
622 // Into: lwz %rt, .L0$poff - .L0$pb(%ri)
624 // or into (if secure plt mode is on):
625 // addis r30, r30, {.LTOC,_GLOBAL_OFFSET_TABLE} - .L0$pb@ha
626 // addi r30, r30, {.LTOC,_GLOBAL_OFFSET_TABLE} - .L0$pb@l
627 // Get the offset from the GOT Base Register to the GOT
628 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, IsDarwin);
629 if (Subtarget->isSecurePlt() && isPositionIndependent() ) {
630 unsigned PICR = TmpInst.getOperand(0).getReg();
631 MCSymbol *BaseSymbol = OutContext.getOrCreateSymbol(
632 M->getPICLevel() == PICLevel::SmallPIC ? "_GLOBAL_OFFSET_TABLE_"
635 MCSymbolRefExpr::create(MF->getPICBaseSymbol(), OutContext);
637 const MCExpr *DeltaExpr = MCBinaryExpr::createSub(
638 MCSymbolRefExpr::create(BaseSymbol, OutContext), PB, OutContext);
640 const MCExpr *DeltaHi = PPCMCExpr::createHa(DeltaExpr, false, OutContext);
643 MCInstBuilder(PPC::ADDIS).addReg(PICR).addReg(PICR).addExpr(DeltaHi));
645 const MCExpr *DeltaLo = PPCMCExpr::createLo(DeltaExpr, false, OutContext);
648 MCInstBuilder(PPC::ADDI).addReg(PICR).addReg(PICR).addExpr(DeltaLo));
651 MCSymbol *PICOffset =
652 MF->getInfo<PPCFunctionInfo>()->getPICOffsetSymbol();
653 TmpInst.setOpcode(PPC::LWZ);
655 MCSymbolRefExpr::create(PICOffset, MCSymbolRefExpr::VK_None, OutContext);
657 MCSymbolRefExpr::create(MF->getPICBaseSymbol(),
658 MCSymbolRefExpr::VK_None,
660 const MCOperand TR = TmpInst.getOperand(1);
661 const MCOperand PICR = TmpInst.getOperand(0);
663 // Step 1: lwz %rt, .L$poff - .L$pb(%ri)
664 TmpInst.getOperand(1) =
665 MCOperand::createExpr(MCBinaryExpr::createSub(Exp, PB, OutContext));
666 TmpInst.getOperand(0) = TR;
667 TmpInst.getOperand(2) = PICR;
668 EmitToStreamer(*OutStreamer, TmpInst);
670 TmpInst.setOpcode(PPC::ADD4);
671 TmpInst.getOperand(0) = PICR;
672 TmpInst.getOperand(1) = TR;
673 TmpInst.getOperand(2) = PICR;
674 EmitToStreamer(*OutStreamer, TmpInst);
679 assert(!IsDarwin && "TOC is an ELF/XCOFF construct.");
681 // Transform %rN = LWZtoc @op1, %r2
682 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, IsDarwin);
684 // Change the opcode to LWZ.
685 TmpInst.setOpcode(PPC::LWZ);
687 const MachineOperand &MO = MI->getOperand(1);
688 assert((MO.isGlobal() || MO.isCPI() || MO.isJTI() || MO.isBlockAddress()) &&
689 "Invalid operand for LWZtoc.");
691 // Map the operand to its corresponding MCSymbol.
692 const MCSymbol *const MOSymbol = getMCSymbolForTOCPseudoMO(MO);
694 // Create a reference to the GOT entry for the symbol. The GOT entry will be
695 // synthesized later.
696 if (PL == PICLevel::SmallPIC && !IsAIX) {
698 MCSymbolRefExpr::create(MOSymbol, MCSymbolRefExpr::VK_GOT,
700 TmpInst.getOperand(1) = MCOperand::createExpr(Exp);
701 EmitToStreamer(*OutStreamer, TmpInst);
705 // Otherwise, use the TOC. 'TOCEntry' is a label used to reference the
706 // storage allocated in the TOC which contains the address of
707 // 'MOSymbol'. Said TOC entry will be synthesized later.
708 MCSymbol *TOCEntry = lookUpOrCreateTOCEntry(MOSymbol);
710 MCSymbolRefExpr::create(TOCEntry, MCSymbolRefExpr::VK_None, OutContext);
712 // AIX uses the label directly as the lwz displacement operand for
713 // references into the toc section. The displacement value will be generated
714 // relative to the toc-base.
717 TM.getCodeModel() == CodeModel::Small &&
718 "This pseudo should only be selected for 32-bit small code model.");
719 TmpInst.getOperand(1) = MCOperand::createExpr(Exp);
720 EmitToStreamer(*OutStreamer, TmpInst);
724 // Create an explicit subtract expression between the local symbol and
725 // '.LTOC' to manifest the toc-relative offset.
726 const MCExpr *PB = MCSymbolRefExpr::create(
727 OutContext.getOrCreateSymbol(Twine(".LTOC")), OutContext);
728 Exp = MCBinaryExpr::createSub(Exp, PB, OutContext);
729 TmpInst.getOperand(1) = MCOperand::createExpr(Exp);
730 EmitToStreamer(*OutStreamer, TmpInst);
737 assert(!IsDarwin && "TOC is an ELF/XCOFF construct");
739 // Transform %x3 = LDtoc @min1, %x2
740 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, IsDarwin);
742 // Change the opcode to LD.
743 TmpInst.setOpcode(PPC::LD);
745 const MachineOperand &MO = MI->getOperand(1);
746 assert((MO.isGlobal() || MO.isCPI() || MO.isJTI() || MO.isBlockAddress()) &&
749 // Map the machine operand to its corresponding MCSymbol, then map the
750 // global address operand to be a reference to the TOC entry we will
753 lookUpOrCreateTOCEntry(getMCSymbolForTOCPseudoMO(MO));
755 const MCSymbolRefExpr::VariantKind VK =
756 IsAIX ? MCSymbolRefExpr::VK_None : MCSymbolRefExpr::VK_PPC_TOC;
758 MCSymbolRefExpr::create(TOCEntry, VK, OutContext);
759 TmpInst.getOperand(1) = MCOperand::createExpr(Exp);
760 EmitToStreamer(*OutStreamer, TmpInst);
763 case PPC::ADDIStocHA: {
764 assert((IsAIX && !IsPPC64 && TM.getCodeModel() == CodeModel::Large) &&
765 "This pseudo should only be selected for 32-bit large code model on"
768 // Transform %rd = ADDIStocHA %rA, @sym(%r2)
769 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, IsDarwin);
771 // Change the opcode to ADDIS.
772 TmpInst.setOpcode(PPC::ADDIS);
774 const MachineOperand &MO = MI->getOperand(2);
775 assert((MO.isGlobal() || MO.isCPI() || MO.isJTI() || MO.isBlockAddress()) &&
776 "Invalid operand for ADDIStocHA.");
778 // Map the machine operand to its corresponding MCSymbol.
779 MCSymbol *MOSymbol = getMCSymbolForTOCPseudoMO(MO);
781 // Always use TOC on AIX. Map the global address operand to be a reference
782 // to the TOC entry we will synthesize later. 'TOCEntry' is a label used to
783 // reference the storage allocated in the TOC which contains the address of
785 MCSymbol *TOCEntry = lookUpOrCreateTOCEntry(MOSymbol);
786 const MCExpr *Exp = MCSymbolRefExpr::create(TOCEntry,
787 MCSymbolRefExpr::VK_PPC_U,
789 TmpInst.getOperand(2) = MCOperand::createExpr(Exp);
790 EmitToStreamer(*OutStreamer, TmpInst);
794 assert(IsAIX && !IsPPC64 && TM.getCodeModel() == CodeModel::Large &&
795 "This pseudo should only be selected for 32-bit large code model on"
798 // Transform %rd = LWZtocL @sym, %rs.
799 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, IsDarwin);
801 // Change the opcode to lwz.
802 TmpInst.setOpcode(PPC::LWZ);
804 const MachineOperand &MO = MI->getOperand(1);
805 assert((MO.isGlobal() || MO.isCPI() || MO.isJTI() || MO.isBlockAddress()) &&
806 "Invalid operand for LWZtocL.");
808 // Map the machine operand to its corresponding MCSymbol.
809 MCSymbol *MOSymbol = getMCSymbolForTOCPseudoMO(MO);
811 // Always use TOC on AIX. Map the global address operand to be a reference
812 // to the TOC entry we will synthesize later. 'TOCEntry' is a label used to
813 // reference the storage allocated in the TOC which contains the address of
815 MCSymbol *TOCEntry = lookUpOrCreateTOCEntry(MOSymbol);
816 const MCExpr *Exp = MCSymbolRefExpr::create(TOCEntry,
817 MCSymbolRefExpr::VK_PPC_L,
819 TmpInst.getOperand(1) = MCOperand::createExpr(Exp);
820 EmitToStreamer(*OutStreamer, TmpInst);
823 case PPC::ADDIStocHA8: {
824 assert(!IsDarwin && "TOC is an ELF/XCOFF construct");
826 // Transform %xd = ADDIStocHA8 %x2, @sym
827 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, IsDarwin);
829 // Change the opcode to ADDIS8. If the global address is the address of
830 // an external symbol, is a jump table address, is a block address, or is a
831 // constant pool index with large code model enabled, then generate a TOC
832 // entry and reference that. Otherwise, reference the symbol directly.
833 TmpInst.setOpcode(PPC::ADDIS8);
835 const MachineOperand &MO = MI->getOperand(2);
836 assert((MO.isGlobal() || MO.isCPI() || MO.isJTI() || MO.isBlockAddress()) &&
837 "Invalid operand for ADDIStocHA8!");
839 const MCSymbol *MOSymbol = getMCSymbolForTOCPseudoMO(MO);
841 const bool GlobalToc =
842 MO.isGlobal() && Subtarget->isGVIndirectSymbol(MO.getGlobal());
843 if (GlobalToc || MO.isJTI() || MO.isBlockAddress() ||
844 (MO.isCPI() && TM.getCodeModel() == CodeModel::Large))
845 MOSymbol = lookUpOrCreateTOCEntry(MOSymbol);
847 const MCSymbolRefExpr::VariantKind VK =
848 IsAIX ? MCSymbolRefExpr::VK_PPC_U : MCSymbolRefExpr::VK_PPC_TOC_HA;
851 MCSymbolRefExpr::create(MOSymbol, VK, OutContext);
853 if (!MO.isJTI() && MO.getOffset())
854 Exp = MCBinaryExpr::createAdd(Exp,
855 MCConstantExpr::create(MO.getOffset(),
859 TmpInst.getOperand(2) = MCOperand::createExpr(Exp);
860 EmitToStreamer(*OutStreamer, TmpInst);
864 assert(!IsDarwin && "TOC is an ELF/XCOFF construct");
866 // Transform %xd = LDtocL @sym, %xs
867 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, IsDarwin);
869 // Change the opcode to LD. If the global address is the address of
870 // an external symbol, is a jump table address, is a block address, or is
871 // a constant pool index with large code model enabled, then generate a
872 // TOC entry and reference that. Otherwise, reference the symbol directly.
873 TmpInst.setOpcode(PPC::LD);
875 const MachineOperand &MO = MI->getOperand(1);
876 assert((MO.isGlobal() || MO.isCPI() || MO.isJTI() ||
877 MO.isBlockAddress()) &&
878 "Invalid operand for LDtocL!");
881 (!MO.isGlobal() || Subtarget->isGVIndirectSymbol(MO.getGlobal())) &&
882 "LDtocL used on symbol that could be accessed directly is "
883 "invalid. Must match ADDIStocHA8."));
885 const MCSymbol *MOSymbol = getMCSymbolForTOCPseudoMO(MO);
887 if (!MO.isCPI() || TM.getCodeModel() == CodeModel::Large)
888 MOSymbol = lookUpOrCreateTOCEntry(MOSymbol);
890 const MCSymbolRefExpr::VariantKind VK =
891 IsAIX ? MCSymbolRefExpr::VK_PPC_L : MCSymbolRefExpr::VK_PPC_TOC_LO;
893 MCSymbolRefExpr::create(MOSymbol, VK, OutContext);
894 TmpInst.getOperand(1) = MCOperand::createExpr(Exp);
895 EmitToStreamer(*OutStreamer, TmpInst);
898 case PPC::ADDItocL: {
899 // Transform %xd = ADDItocL %xs, @sym
900 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, IsDarwin);
902 // Change the opcode to ADDI8. If the global address is external, then
903 // generate a TOC entry and reference that. Otherwise, reference the
905 TmpInst.setOpcode(PPC::ADDI8);
907 const MachineOperand &MO = MI->getOperand(2);
908 assert((MO.isGlobal() || MO.isCPI()) && "Invalid operand for ADDItocL.");
911 !(MO.isGlobal() && Subtarget->isGVIndirectSymbol(MO.getGlobal())) &&
912 "Interposable definitions must use indirect access."));
915 MCSymbolRefExpr::create(getMCSymbolForTOCPseudoMO(MO),
916 MCSymbolRefExpr::VK_PPC_TOC_LO, OutContext);
917 TmpInst.getOperand(2) = MCOperand::createExpr(Exp);
918 EmitToStreamer(*OutStreamer, TmpInst);
921 case PPC::ADDISgotTprelHA: {
922 // Transform: %xd = ADDISgotTprelHA %x2, @sym
923 // Into: %xd = ADDIS8 %x2, sym@got@tlsgd@ha
924 assert(IsPPC64 && "Not supported for 32-bit PowerPC");
925 const MachineOperand &MO = MI->getOperand(2);
926 const GlobalValue *GValue = MO.getGlobal();
927 MCSymbol *MOSymbol = getSymbol(GValue);
928 const MCExpr *SymGotTprel =
929 MCSymbolRefExpr::create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TPREL_HA,
931 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::ADDIS8)
932 .addReg(MI->getOperand(0).getReg())
933 .addReg(MI->getOperand(1).getReg())
934 .addExpr(SymGotTprel));
937 case PPC::LDgotTprelL:
938 case PPC::LDgotTprelL32: {
939 // Transform %xd = LDgotTprelL @sym, %xs
940 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, IsDarwin);
942 // Change the opcode to LD.
943 TmpInst.setOpcode(IsPPC64 ? PPC::LD : PPC::LWZ);
944 const MachineOperand &MO = MI->getOperand(1);
945 const GlobalValue *GValue = MO.getGlobal();
946 MCSymbol *MOSymbol = getSymbol(GValue);
947 const MCExpr *Exp = MCSymbolRefExpr::create(
948 MOSymbol, IsPPC64 ? MCSymbolRefExpr::VK_PPC_GOT_TPREL_LO
949 : MCSymbolRefExpr::VK_PPC_GOT_TPREL,
951 TmpInst.getOperand(1) = MCOperand::createExpr(Exp);
952 EmitToStreamer(*OutStreamer, TmpInst);
956 case PPC::PPC32PICGOT: {
957 MCSymbol *GOTSymbol = OutContext.getOrCreateSymbol(StringRef("_GLOBAL_OFFSET_TABLE_"));
958 MCSymbol *GOTRef = OutContext.createTempSymbol();
959 MCSymbol *NextInstr = OutContext.createTempSymbol();
961 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::BL)
962 // FIXME: We would like an efficient form for this, so we don't have to do
963 // a lot of extra uniquing.
964 .addExpr(MCSymbolRefExpr::create(NextInstr, OutContext)));
965 const MCExpr *OffsExpr =
966 MCBinaryExpr::createSub(MCSymbolRefExpr::create(GOTSymbol, OutContext),
967 MCSymbolRefExpr::create(GOTRef, OutContext),
969 OutStreamer->EmitLabel(GOTRef);
970 OutStreamer->EmitValue(OffsExpr, 4);
971 OutStreamer->EmitLabel(NextInstr);
972 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::MFLR)
973 .addReg(MI->getOperand(0).getReg()));
974 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::LWZ)
975 .addReg(MI->getOperand(1).getReg())
977 .addReg(MI->getOperand(0).getReg()));
978 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::ADD4)
979 .addReg(MI->getOperand(0).getReg())
980 .addReg(MI->getOperand(1).getReg())
981 .addReg(MI->getOperand(0).getReg()));
984 case PPC::PPC32GOT: {
985 MCSymbol *GOTSymbol =
986 OutContext.getOrCreateSymbol(StringRef("_GLOBAL_OFFSET_TABLE_"));
987 const MCExpr *SymGotTlsL = MCSymbolRefExpr::create(
988 GOTSymbol, MCSymbolRefExpr::VK_PPC_LO, OutContext);
989 const MCExpr *SymGotTlsHA = MCSymbolRefExpr::create(
990 GOTSymbol, MCSymbolRefExpr::VK_PPC_HA, OutContext);
991 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::LI)
992 .addReg(MI->getOperand(0).getReg())
993 .addExpr(SymGotTlsL));
994 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::ADDIS)
995 .addReg(MI->getOperand(0).getReg())
996 .addReg(MI->getOperand(0).getReg())
997 .addExpr(SymGotTlsHA));
1000 case PPC::ADDIStlsgdHA: {
1001 // Transform: %xd = ADDIStlsgdHA %x2, @sym
1002 // Into: %xd = ADDIS8 %x2, sym@got@tlsgd@ha
1003 assert(IsPPC64 && "Not supported for 32-bit PowerPC");
1004 const MachineOperand &MO = MI->getOperand(2);
1005 const GlobalValue *GValue = MO.getGlobal();
1006 MCSymbol *MOSymbol = getSymbol(GValue);
1007 const MCExpr *SymGotTlsGD =
1008 MCSymbolRefExpr::create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TLSGD_HA,
1010 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::ADDIS8)
1011 .addReg(MI->getOperand(0).getReg())
1012 .addReg(MI->getOperand(1).getReg())
1013 .addExpr(SymGotTlsGD));
1016 case PPC::ADDItlsgdL:
1017 // Transform: %xd = ADDItlsgdL %xs, @sym
1018 // Into: %xd = ADDI8 %xs, sym@got@tlsgd@l
1019 case PPC::ADDItlsgdL32: {
1020 // Transform: %rd = ADDItlsgdL32 %rs, @sym
1021 // Into: %rd = ADDI %rs, sym@got@tlsgd
1022 const MachineOperand &MO = MI->getOperand(2);
1023 const GlobalValue *GValue = MO.getGlobal();
1024 MCSymbol *MOSymbol = getSymbol(GValue);
1025 const MCExpr *SymGotTlsGD = MCSymbolRefExpr::create(
1026 MOSymbol, IsPPC64 ? MCSymbolRefExpr::VK_PPC_GOT_TLSGD_LO
1027 : MCSymbolRefExpr::VK_PPC_GOT_TLSGD,
1029 EmitToStreamer(*OutStreamer,
1030 MCInstBuilder(IsPPC64 ? PPC::ADDI8 : PPC::ADDI)
1031 .addReg(MI->getOperand(0).getReg())
1032 .addReg(MI->getOperand(1).getReg())
1033 .addExpr(SymGotTlsGD));
1036 case PPC::GETtlsADDR:
1037 // Transform: %x3 = GETtlsADDR %x3, @sym
1038 // Into: BL8_NOP_TLS __tls_get_addr(sym at tlsgd)
1039 case PPC::GETtlsADDR32: {
1040 // Transform: %r3 = GETtlsADDR32 %r3, @sym
1041 // Into: BL_TLS __tls_get_addr(sym at tlsgd)@PLT
1042 EmitTlsCall(MI, MCSymbolRefExpr::VK_PPC_TLSGD);
1045 case PPC::ADDIStlsldHA: {
1046 // Transform: %xd = ADDIStlsldHA %x2, @sym
1047 // Into: %xd = ADDIS8 %x2, sym@got@tlsld@ha
1048 assert(IsPPC64 && "Not supported for 32-bit PowerPC");
1049 const MachineOperand &MO = MI->getOperand(2);
1050 const GlobalValue *GValue = MO.getGlobal();
1051 MCSymbol *MOSymbol = getSymbol(GValue);
1052 const MCExpr *SymGotTlsLD =
1053 MCSymbolRefExpr::create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TLSLD_HA,
1055 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::ADDIS8)
1056 .addReg(MI->getOperand(0).getReg())
1057 .addReg(MI->getOperand(1).getReg())
1058 .addExpr(SymGotTlsLD));
1061 case PPC::ADDItlsldL:
1062 // Transform: %xd = ADDItlsldL %xs, @sym
1063 // Into: %xd = ADDI8 %xs, sym@got@tlsld@l
1064 case PPC::ADDItlsldL32: {
1065 // Transform: %rd = ADDItlsldL32 %rs, @sym
1066 // Into: %rd = ADDI %rs, sym@got@tlsld
1067 const MachineOperand &MO = MI->getOperand(2);
1068 const GlobalValue *GValue = MO.getGlobal();
1069 MCSymbol *MOSymbol = getSymbol(GValue);
1070 const MCExpr *SymGotTlsLD = MCSymbolRefExpr::create(
1071 MOSymbol, IsPPC64 ? MCSymbolRefExpr::VK_PPC_GOT_TLSLD_LO
1072 : MCSymbolRefExpr::VK_PPC_GOT_TLSLD,
1074 EmitToStreamer(*OutStreamer,
1075 MCInstBuilder(IsPPC64 ? PPC::ADDI8 : PPC::ADDI)
1076 .addReg(MI->getOperand(0).getReg())
1077 .addReg(MI->getOperand(1).getReg())
1078 .addExpr(SymGotTlsLD));
1081 case PPC::GETtlsldADDR:
1082 // Transform: %x3 = GETtlsldADDR %x3, @sym
1083 // Into: BL8_NOP_TLS __tls_get_addr(sym at tlsld)
1084 case PPC::GETtlsldADDR32: {
1085 // Transform: %r3 = GETtlsldADDR32 %r3, @sym
1086 // Into: BL_TLS __tls_get_addr(sym at tlsld)@PLT
1087 EmitTlsCall(MI, MCSymbolRefExpr::VK_PPC_TLSLD);
1090 case PPC::ADDISdtprelHA:
1091 // Transform: %xd = ADDISdtprelHA %xs, @sym
1092 // Into: %xd = ADDIS8 %xs, sym@dtprel@ha
1093 case PPC::ADDISdtprelHA32: {
1094 // Transform: %rd = ADDISdtprelHA32 %rs, @sym
1095 // Into: %rd = ADDIS %rs, sym@dtprel@ha
1096 const MachineOperand &MO = MI->getOperand(2);
1097 const GlobalValue *GValue = MO.getGlobal();
1098 MCSymbol *MOSymbol = getSymbol(GValue);
1099 const MCExpr *SymDtprel =
1100 MCSymbolRefExpr::create(MOSymbol, MCSymbolRefExpr::VK_PPC_DTPREL_HA,
1104 MCInstBuilder(IsPPC64 ? PPC::ADDIS8 : PPC::ADDIS)
1105 .addReg(MI->getOperand(0).getReg())
1106 .addReg(MI->getOperand(1).getReg())
1107 .addExpr(SymDtprel));
1110 case PPC::ADDIdtprelL:
1111 // Transform: %xd = ADDIdtprelL %xs, @sym
1112 // Into: %xd = ADDI8 %xs, sym@dtprel@l
1113 case PPC::ADDIdtprelL32: {
1114 // Transform: %rd = ADDIdtprelL32 %rs, @sym
1115 // Into: %rd = ADDI %rs, sym@dtprel@l
1116 const MachineOperand &MO = MI->getOperand(2);
1117 const GlobalValue *GValue = MO.getGlobal();
1118 MCSymbol *MOSymbol = getSymbol(GValue);
1119 const MCExpr *SymDtprel =
1120 MCSymbolRefExpr::create(MOSymbol, MCSymbolRefExpr::VK_PPC_DTPREL_LO,
1122 EmitToStreamer(*OutStreamer,
1123 MCInstBuilder(IsPPC64 ? PPC::ADDI8 : PPC::ADDI)
1124 .addReg(MI->getOperand(0).getReg())
1125 .addReg(MI->getOperand(1).getReg())
1126 .addExpr(SymDtprel));
1131 if (!Subtarget->hasMFOCRF()) {
1132 // Transform: %r3 = MFOCRF %cr7
1133 // Into: %r3 = MFCR ;; cr7
1134 unsigned NewOpcode =
1135 MI->getOpcode() == PPC::MFOCRF ? PPC::MFCR : PPC::MFCR8;
1136 OutStreamer->AddComment(PPCInstPrinter::
1137 getRegisterName(MI->getOperand(1).getReg()));
1138 EmitToStreamer(*OutStreamer, MCInstBuilder(NewOpcode)
1139 .addReg(MI->getOperand(0).getReg()));
1145 if (!Subtarget->hasMFOCRF()) {
1146 // Transform: %cr7 = MTOCRF %r3
1147 // Into: MTCRF mask, %r3 ;; cr7
1148 unsigned NewOpcode =
1149 MI->getOpcode() == PPC::MTOCRF ? PPC::MTCRF : PPC::MTCRF8;
1150 unsigned Mask = 0x80 >> OutContext.getRegisterInfo()
1151 ->getEncodingValue(MI->getOperand(0).getReg());
1152 OutStreamer->AddComment(PPCInstPrinter::
1153 getRegisterName(MI->getOperand(0).getReg()));
1154 EmitToStreamer(*OutStreamer, MCInstBuilder(NewOpcode)
1156 .addReg(MI->getOperand(1).getReg()));
1164 // Verify alignment is legal, so we don't create relocations
1165 // that can't be supported.
1166 // FIXME: This test is currently disabled for Darwin. The test
1167 // suite shows a handful of test cases that fail this check for
1168 // Darwin. Those need to be investigated before this sanity test
1169 // can be enabled for those subtargets.
1171 unsigned OpNum = (MI->getOpcode() == PPC::STD) ? 2 : 1;
1172 const MachineOperand &MO = MI->getOperand(OpNum);
1173 if (MO.isGlobal() && MO.getGlobal()->getAlignment() < 4)
1174 llvm_unreachable("Global must be word-aligned for LD, STD, LWA!");
1176 // Now process the instruction normally.
1181 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, IsDarwin);
1182 EmitToStreamer(*OutStreamer, TmpInst);
1185 void PPCLinuxAsmPrinter::EmitInstruction(const MachineInstr *MI) {
1186 if (!Subtarget->isPPC64())
1187 return PPCAsmPrinter::EmitInstruction(MI);
1189 switch (MI->getOpcode()) {
1191 return PPCAsmPrinter::EmitInstruction(MI);
1192 case TargetOpcode::PATCHABLE_FUNCTION_ENTER: {
1194 // b .end # lis 0, FuncId[16..32]
1195 // nop # li 0, FuncId[0..15]
1198 // bl __xray_FunctionEntry
1202 // Update compiler-rt/lib/xray/xray_powerpc64.cc accordingly when number
1203 // of instructions change.
1204 MCSymbol *BeginOfSled = OutContext.createTempSymbol();
1205 MCSymbol *EndOfSled = OutContext.createTempSymbol();
1206 OutStreamer->EmitLabel(BeginOfSled);
1207 EmitToStreamer(*OutStreamer,
1208 MCInstBuilder(PPC::B).addExpr(
1209 MCSymbolRefExpr::create(EndOfSled, OutContext)));
1210 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::NOP));
1213 MCInstBuilder(PPC::STD).addReg(PPC::X0).addImm(-8).addReg(PPC::X1));
1214 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::MFLR8).addReg(PPC::X0));
1215 EmitToStreamer(*OutStreamer,
1216 MCInstBuilder(PPC::BL8_NOP)
1217 .addExpr(MCSymbolRefExpr::create(
1218 OutContext.getOrCreateSymbol("__xray_FunctionEntry"),
1220 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::MTLR8).addReg(PPC::X0));
1221 OutStreamer->EmitLabel(EndOfSled);
1222 recordSled(BeginOfSled, *MI, SledKind::FUNCTION_ENTER);
1225 case TargetOpcode::PATCHABLE_RET: {
1226 unsigned RetOpcode = MI->getOperand(0).getImm();
1228 RetInst.setOpcode(RetOpcode);
1229 for (const auto &MO :
1230 make_range(std::next(MI->operands_begin()), MI->operands_end())) {
1232 if (LowerPPCMachineOperandToMCOperand(MO, MCOp, *this, false))
1233 RetInst.addOperand(MCOp);
1237 if (RetOpcode == PPC::BCCLR) {
1238 IsConditional = true;
1239 } else if (RetOpcode == PPC::TCRETURNdi8 || RetOpcode == PPC::TCRETURNri8 ||
1240 RetOpcode == PPC::TCRETURNai8) {
1242 } else if (RetOpcode == PPC::BLR8 || RetOpcode == PPC::TAILB8) {
1243 IsConditional = false;
1245 EmitToStreamer(*OutStreamer, RetInst);
1249 MCSymbol *FallthroughLabel;
1250 if (IsConditional) {
1258 // blr # lis 0, FuncId[16..32]
1259 // nop # li 0, FuncId[0..15]
1262 // bl __xray_FunctionExit
1267 // Update compiler-rt/lib/xray/xray_powerpc64.cc accordingly when number
1268 // of instructions change.
1269 FallthroughLabel = OutContext.createTempSymbol();
1272 MCInstBuilder(PPC::BCC)
1273 .addImm(PPC::InvertPredicate(
1274 static_cast<PPC::Predicate>(MI->getOperand(1).getImm())))
1275 .addReg(MI->getOperand(2).getReg())
1276 .addExpr(MCSymbolRefExpr::create(FallthroughLabel, OutContext)));
1278 RetInst.setOpcode(PPC::BLR8);
1282 // b(lr)? # lis 0, FuncId[16..32]
1283 // nop # li 0, FuncId[0..15]
1286 // bl __xray_FunctionExit
1290 // Update compiler-rt/lib/xray/xray_powerpc64.cc accordingly when number
1291 // of instructions change.
1292 OutStreamer->EmitCodeAlignment(8);
1293 MCSymbol *BeginOfSled = OutContext.createTempSymbol();
1294 OutStreamer->EmitLabel(BeginOfSled);
1295 EmitToStreamer(*OutStreamer, RetInst);
1296 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::NOP));
1299 MCInstBuilder(PPC::STD).addReg(PPC::X0).addImm(-8).addReg(PPC::X1));
1300 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::MFLR8).addReg(PPC::X0));
1301 EmitToStreamer(*OutStreamer,
1302 MCInstBuilder(PPC::BL8_NOP)
1303 .addExpr(MCSymbolRefExpr::create(
1304 OutContext.getOrCreateSymbol("__xray_FunctionExit"),
1306 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::MTLR8).addReg(PPC::X0));
1307 EmitToStreamer(*OutStreamer, RetInst);
1309 OutStreamer->EmitLabel(FallthroughLabel);
1310 recordSled(BeginOfSled, *MI, SledKind::FUNCTION_EXIT);
1313 case TargetOpcode::PATCHABLE_FUNCTION_EXIT:
1314 llvm_unreachable("PATCHABLE_FUNCTION_EXIT should never be emitted");
1315 case TargetOpcode::PATCHABLE_TAIL_CALL:
1316 // TODO: Define a trampoline `__xray_FunctionTailExit` and differentiate a
1317 // normal function exit from a tail exit.
1318 llvm_unreachable("Tail call is handled in the normal case. See comments "
1319 "around this assert.");
1323 void PPCLinuxAsmPrinter::EmitStartOfAsmFile(Module &M) {
1324 if (static_cast<const PPCTargetMachine &>(TM).isELFv2ABI()) {
1325 PPCTargetStreamer *TS =
1326 static_cast<PPCTargetStreamer *>(OutStreamer->getTargetStreamer());
1329 TS->emitAbiVersion(2);
1332 if (static_cast<const PPCTargetMachine &>(TM).isPPC64() ||
1333 !isPositionIndependent())
1334 return AsmPrinter::EmitStartOfAsmFile(M);
1336 if (M.getPICLevel() == PICLevel::SmallPIC)
1337 return AsmPrinter::EmitStartOfAsmFile(M);
1339 OutStreamer->SwitchSection(OutContext.getELFSection(
1340 ".got2", ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC));
1342 MCSymbol *TOCSym = OutContext.getOrCreateSymbol(Twine(".LTOC"));
1343 MCSymbol *CurrentPos = OutContext.createTempSymbol();
1345 OutStreamer->EmitLabel(CurrentPos);
1347 // The GOT pointer points to the middle of the GOT, in order to reference the
1348 // entire 64kB range. 0x8000 is the midpoint.
1349 const MCExpr *tocExpr =
1350 MCBinaryExpr::createAdd(MCSymbolRefExpr::create(CurrentPos, OutContext),
1351 MCConstantExpr::create(0x8000, OutContext),
1354 OutStreamer->EmitAssignment(TOCSym, tocExpr);
1356 OutStreamer->SwitchSection(getObjFileLowering().getTextSection());
1359 void PPCLinuxAsmPrinter::EmitFunctionEntryLabel() {
1360 // linux/ppc32 - Normal entry label.
1361 if (!Subtarget->isPPC64() &&
1362 (!isPositionIndependent() ||
1363 MF->getFunction().getParent()->getPICLevel() == PICLevel::SmallPIC))
1364 return AsmPrinter::EmitFunctionEntryLabel();
1366 if (!Subtarget->isPPC64()) {
1367 const PPCFunctionInfo *PPCFI = MF->getInfo<PPCFunctionInfo>();
1368 if (PPCFI->usesPICBase() && !Subtarget->isSecurePlt()) {
1369 MCSymbol *RelocSymbol = PPCFI->getPICOffsetSymbol();
1370 MCSymbol *PICBase = MF->getPICBaseSymbol();
1371 OutStreamer->EmitLabel(RelocSymbol);
1373 const MCExpr *OffsExpr =
1374 MCBinaryExpr::createSub(
1375 MCSymbolRefExpr::create(OutContext.getOrCreateSymbol(Twine(".LTOC")),
1377 MCSymbolRefExpr::create(PICBase, OutContext),
1379 OutStreamer->EmitValue(OffsExpr, 4);
1380 OutStreamer->EmitLabel(CurrentFnSym);
1383 return AsmPrinter::EmitFunctionEntryLabel();
1386 // ELFv2 ABI - Normal entry label.
1387 if (Subtarget->isELFv2ABI()) {
1388 // In the Large code model, we allow arbitrary displacements between
1389 // the text section and its associated TOC section. We place the
1390 // full 8-byte offset to the TOC in memory immediately preceding
1391 // the function global entry point.
1392 if (TM.getCodeModel() == CodeModel::Large
1393 && !MF->getRegInfo().use_empty(PPC::X2)) {
1394 const PPCFunctionInfo *PPCFI = MF->getInfo<PPCFunctionInfo>();
1396 MCSymbol *TOCSymbol = OutContext.getOrCreateSymbol(StringRef(".TOC."));
1397 MCSymbol *GlobalEPSymbol = PPCFI->getGlobalEPSymbol();
1398 const MCExpr *TOCDeltaExpr =
1399 MCBinaryExpr::createSub(MCSymbolRefExpr::create(TOCSymbol, OutContext),
1400 MCSymbolRefExpr::create(GlobalEPSymbol,
1404 OutStreamer->EmitLabel(PPCFI->getTOCOffsetSymbol());
1405 OutStreamer->EmitValue(TOCDeltaExpr, 8);
1407 return AsmPrinter::EmitFunctionEntryLabel();
1410 // Emit an official procedure descriptor.
1411 MCSectionSubPair Current = OutStreamer->getCurrentSection();
1412 MCSectionELF *Section = OutStreamer->getContext().getELFSection(
1413 ".opd", ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC);
1414 OutStreamer->SwitchSection(Section);
1415 OutStreamer->EmitLabel(CurrentFnSym);
1416 OutStreamer->EmitValueToAlignment(8);
1417 MCSymbol *Symbol1 = CurrentFnSymForSize;
1418 // Generates a R_PPC64_ADDR64 (from FK_DATA_8) relocation for the function
1420 OutStreamer->EmitValue(MCSymbolRefExpr::create(Symbol1, OutContext),
1422 MCSymbol *Symbol2 = OutContext.getOrCreateSymbol(StringRef(".TOC."));
1423 // Generates a R_PPC64_TOC relocation for TOC base insertion.
1424 OutStreamer->EmitValue(
1425 MCSymbolRefExpr::create(Symbol2, MCSymbolRefExpr::VK_PPC_TOCBASE, OutContext),
1427 // Emit a null environment pointer.
1428 OutStreamer->EmitIntValue(0, 8 /* size */);
1429 OutStreamer->SwitchSection(Current.first, Current.second);
1432 bool PPCLinuxAsmPrinter::doFinalization(Module &M) {
1433 const DataLayout &DL = getDataLayout();
1435 bool isPPC64 = DL.getPointerSizeInBits() == 64;
1437 PPCTargetStreamer &TS =
1438 static_cast<PPCTargetStreamer &>(*OutStreamer->getTargetStreamer());
1441 MCSectionELF *Section;
1444 Section = OutStreamer->getContext().getELFSection(
1445 ".toc", ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC);
1447 Section = OutStreamer->getContext().getELFSection(
1448 ".got2", ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC);
1449 OutStreamer->SwitchSection(Section);
1451 for (const auto &TOCMapPair : TOC) {
1452 const MCSymbol *const TOCEntryTarget = TOCMapPair.first;
1453 MCSymbol *const TOCEntryLabel = TOCMapPair.second;
1455 OutStreamer->EmitLabel(TOCEntryLabel);
1457 TS.emitTCEntry(*TOCEntryTarget);
1459 OutStreamer->EmitValueToAlignment(4);
1460 OutStreamer->EmitSymbolValue(TOCEntryTarget, 4);
1465 return AsmPrinter::doFinalization(M);
1468 /// EmitFunctionBodyStart - Emit a global entry point prefix for ELFv2.
1469 void PPCLinuxAsmPrinter::EmitFunctionBodyStart() {
1470 // In the ELFv2 ABI, in functions that use the TOC register, we need to
1471 // provide two entry points. The ABI guarantees that when calling the
1472 // local entry point, r2 is set up by the caller to contain the TOC base
1473 // for this function, and when calling the global entry point, r12 is set
1474 // up by the caller to hold the address of the global entry point. We
1475 // thus emit a prefix sequence along the following lines:
1479 // # global entry point
1480 // addis r2,r12,(.TOC.-.Lfunc_gepNN)@ha
1481 // addi r2,r2,(.TOC.-.Lfunc_gepNN)@l
1483 // .localentry func, .Lfunc_lepNN-.Lfunc_gepNN
1484 // # local entry point, followed by function body
1486 // For the Large code model, we create
1489 // .quad .TOC.-.Lfunc_gepNN # done by EmitFunctionEntryLabel
1492 // # global entry point
1493 // ld r2,.Lfunc_tocNN-.Lfunc_gepNN(r12)
1496 // .localentry func, .Lfunc_lepNN-.Lfunc_gepNN
1497 // # local entry point, followed by function body
1499 // This ensures we have r2 set up correctly while executing the function
1500 // body, no matter which entry point is called.
1501 if (Subtarget->isELFv2ABI()
1502 // Only do all that if the function uses r2 in the first place.
1503 && !MF->getRegInfo().use_empty(PPC::X2)) {
1504 // Note: The logic here must be synchronized with the code in the
1505 // branch-selection pass which sets the offset of the first block in the
1506 // function. This matters because it affects the alignment.
1507 const PPCFunctionInfo *PPCFI = MF->getInfo<PPCFunctionInfo>();
1509 MCSymbol *GlobalEntryLabel = PPCFI->getGlobalEPSymbol();
1510 OutStreamer->EmitLabel(GlobalEntryLabel);
1511 const MCSymbolRefExpr *GlobalEntryLabelExp =
1512 MCSymbolRefExpr::create(GlobalEntryLabel, OutContext);
1514 if (TM.getCodeModel() != CodeModel::Large) {
1515 MCSymbol *TOCSymbol = OutContext.getOrCreateSymbol(StringRef(".TOC."));
1516 const MCExpr *TOCDeltaExpr =
1517 MCBinaryExpr::createSub(MCSymbolRefExpr::create(TOCSymbol, OutContext),
1518 GlobalEntryLabelExp, OutContext);
1520 const MCExpr *TOCDeltaHi =
1521 PPCMCExpr::createHa(TOCDeltaExpr, false, OutContext);
1522 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::ADDIS)
1525 .addExpr(TOCDeltaHi));
1527 const MCExpr *TOCDeltaLo =
1528 PPCMCExpr::createLo(TOCDeltaExpr, false, OutContext);
1529 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::ADDI)
1532 .addExpr(TOCDeltaLo));
1534 MCSymbol *TOCOffset = PPCFI->getTOCOffsetSymbol();
1535 const MCExpr *TOCOffsetDeltaExpr =
1536 MCBinaryExpr::createSub(MCSymbolRefExpr::create(TOCOffset, OutContext),
1537 GlobalEntryLabelExp, OutContext);
1539 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::LD)
1541 .addExpr(TOCOffsetDeltaExpr)
1543 EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::ADD8)
1549 MCSymbol *LocalEntryLabel = PPCFI->getLocalEPSymbol();
1550 OutStreamer->EmitLabel(LocalEntryLabel);
1551 const MCSymbolRefExpr *LocalEntryLabelExp =
1552 MCSymbolRefExpr::create(LocalEntryLabel, OutContext);
1553 const MCExpr *LocalOffsetExp =
1554 MCBinaryExpr::createSub(LocalEntryLabelExp,
1555 GlobalEntryLabelExp, OutContext);
1557 PPCTargetStreamer *TS =
1558 static_cast<PPCTargetStreamer *>(OutStreamer->getTargetStreamer());
1561 TS->emitLocalEntry(cast<MCSymbolELF>(CurrentFnSym), LocalOffsetExp);
1565 /// EmitFunctionBodyEnd - Print the traceback table before the .size
1568 void PPCLinuxAsmPrinter::EmitFunctionBodyEnd() {
1569 // Only the 64-bit target requires a traceback table. For now,
1570 // we only emit the word of zeroes that GDB requires to find
1571 // the end of the function, and zeroes for the eight-byte
1572 // mandatory fields.
1573 // FIXME: We should fill in the eight-byte mandatory fields as described in
1574 // the PPC64 ELF ABI (this is a low-priority item because GDB does not
1575 // currently make use of these fields).
1576 if (Subtarget->isPPC64()) {
1577 OutStreamer->EmitIntValue(0, 4/*size*/);
1578 OutStreamer->EmitIntValue(0, 8/*size*/);
1582 void PPCAIXAsmPrinter::SetupMachineFunction(MachineFunction &MF) {
1583 // Get the function descriptor symbol.
1584 CurrentFnDescSym = getSymbol(&MF.getFunction());
1585 // Set the containing csect.
1586 MCSectionXCOFF *FnDescSec = OutStreamer->getContext().getXCOFFSection(
1587 CurrentFnDescSym->getName(), XCOFF::XMC_DS, XCOFF::XTY_SD,
1588 XCOFF::C_HIDEXT, SectionKind::getData());
1589 cast<MCSymbolXCOFF>(CurrentFnDescSym)->setContainingCsect(FnDescSec);
1591 return AsmPrinter::SetupMachineFunction(MF);
1594 void PPCAIXAsmPrinter::ValidateGV(const GlobalVariable *GV) {
1595 // Early error checking limiting what is supported.
1596 if (GV->isThreadLocal())
1597 report_fatal_error("Thread local not yet supported on AIX.");
1599 if (GV->hasSection())
1600 report_fatal_error("Custom section for Data not yet supported.");
1602 if (GV->hasComdat())
1603 report_fatal_error("COMDAT not yet supported by AIX.");
1606 const MCExpr *PPCAIXAsmPrinter::lowerConstant(const Constant *CV) {
1607 if (const Function *F = dyn_cast<Function>(CV)) {
1608 MCSymbolXCOFF *FSym = cast<MCSymbolXCOFF>(getSymbol(F));
1609 if (!FSym->hasContainingCsect()) {
1610 const XCOFF::StorageClass SC =
1612 ? TargetLoweringObjectFileXCOFF::getStorageClassForGlobal(F)
1614 MCSectionXCOFF *Csect = OutStreamer->getContext().getXCOFFSection(
1615 FSym->getName(), XCOFF::XMC_DS,
1616 F->isDeclaration() ? XCOFF::XTY_ER : XCOFF::XTY_SD, SC,
1617 SectionKind::getData());
1618 FSym->setContainingCsect(Csect);
1620 return MCSymbolRefExpr::create(
1621 FSym->getContainingCsect()->getQualNameSymbol(), OutContext);
1623 return PPCAsmPrinter::lowerConstant(CV);
1626 void PPCAIXAsmPrinter::EmitGlobalVariable(const GlobalVariable *GV) {
1629 // External global variables are already handled.
1630 if (!GV->hasInitializer())
1633 // Create the symbol, set its storage class.
1634 MCSymbolXCOFF *GVSym = cast<MCSymbolXCOFF>(getSymbol(GV));
1635 GVSym->setStorageClass(
1636 TargetLoweringObjectFileXCOFF::getStorageClassForGlobal(GV));
1638 SectionKind GVKind = getObjFileLowering().getKindForGlobal(GV, TM);
1639 if ((!GVKind.isGlobalWriteableData() && !GVKind.isReadOnly()) ||
1640 GVKind.isMergeable2ByteCString() || GVKind.isMergeable4ByteCString())
1641 report_fatal_error("Encountered a global variable kind that is "
1642 "not supported yet.");
1644 // Create the containing csect and switch to it.
1645 MCSectionXCOFF *Csect = cast<MCSectionXCOFF>(
1646 getObjFileLowering().SectionForGlobal(GV, GVKind, TM));
1647 OutStreamer->SwitchSection(Csect);
1648 GVSym->setContainingCsect(Csect);
1650 const DataLayout &DL = GV->getParent()->getDataLayout();
1652 // Handle common symbols.
1653 if (GVKind.isCommon() || GVKind.isBSSLocal()) {
1655 GV->getAlignment() ? GV->getAlignment() : DL.getPreferredAlignment(GV);
1656 uint64_t Size = DL.getTypeAllocSize(GV->getType()->getElementType());
1658 if (GVKind.isBSSLocal())
1659 OutStreamer->EmitXCOFFLocalCommonSymbol(
1660 GVSym, Size, Csect->getQualNameSymbol(), Align);
1662 OutStreamer->EmitCommonSymbol(Csect->getQualNameSymbol(), Size, Align);
1666 MCSymbol *EmittedInitSym = GVSym;
1667 EmitLinkage(GV, EmittedInitSym);
1668 EmitAlignment(getGVAlignment(GV, DL), GV);
1669 OutStreamer->EmitLabel(EmittedInitSym);
1670 EmitGlobalConstant(GV->getParent()->getDataLayout(), GV->getInitializer());
1673 void PPCAIXAsmPrinter::EmitFunctionDescriptor() {
1674 const DataLayout &DL = getDataLayout();
1675 const unsigned PointerSize = DL.getPointerSizeInBits() == 64 ? 8 : 4;
1677 MCSectionSubPair Current = OutStreamer->getCurrentSection();
1678 // Emit function descriptor.
1679 OutStreamer->SwitchSection(
1680 cast<MCSymbolXCOFF>(CurrentFnDescSym)->getContainingCsect());
1681 OutStreamer->EmitLabel(CurrentFnDescSym);
1682 // Emit function entry point address.
1683 OutStreamer->EmitValue(MCSymbolRefExpr::create(CurrentFnSym, OutContext),
1685 // Emit TOC base address.
1686 const MCSectionXCOFF *TOCBaseSec = OutStreamer->getContext().getXCOFFSection(
1687 StringRef("TOC"), XCOFF::XMC_TC0, XCOFF::XTY_SD, XCOFF::C_HIDEXT,
1688 SectionKind::getData());
1689 const MCSymbol *TOCBaseSym = TOCBaseSec->getQualNameSymbol();
1690 OutStreamer->EmitValue(MCSymbolRefExpr::create(TOCBaseSym, OutContext),
1692 // Emit a null environment pointer.
1693 OutStreamer->EmitIntValue(0, PointerSize);
1695 OutStreamer->SwitchSection(Current.first, Current.second);
1698 void PPCAIXAsmPrinter::EmitEndOfAsmFile(Module &M) {
1699 // If there are no functions in this module, we will never need to reference
1705 MCSectionXCOFF *TOCBaseSection = OutStreamer->getContext().getXCOFFSection(
1706 StringRef("TOC"), XCOFF::XMC_TC0, XCOFF::XTY_SD, XCOFF::C_HIDEXT,
1707 SectionKind::getData());
1708 // The TOC-base always has 0 size, but 4 byte alignment.
1709 TOCBaseSection->setAlignment(Align(4));
1710 // Switch to section to emit TOC base.
1711 OutStreamer->SwitchSection(TOCBaseSection);
1713 PPCTargetStreamer &TS =
1714 static_cast<PPCTargetStreamer &>(*OutStreamer->getTargetStreamer());
1716 for (auto &I : TOC) {
1717 // Setup the csect for the current TC entry.
1718 MCSectionXCOFF *TCEntry = OutStreamer->getContext().getXCOFFSection(
1719 cast<MCSymbolXCOFF>(I.first)->getUnqualifiedName(), XCOFF::XMC_TC,
1720 XCOFF::XTY_SD, XCOFF::C_HIDEXT, SectionKind::getData());
1721 cast<MCSymbolXCOFF>(I.second)->setContainingCsect(TCEntry);
1722 OutStreamer->SwitchSection(TCEntry);
1724 OutStreamer->EmitLabel(I.second);
1725 TS.emitTCEntry(*I.first);
1730 PPCAIXAsmPrinter::getMCSymbolForTOCPseudoMO(const MachineOperand &MO) {
1731 const GlobalObject *GO = nullptr;
1733 // If the MO is a function or certain kind of globals, we want to make sure to
1734 // refer to the csect symbol, otherwise we can just do the default handling.
1735 if (MO.getType() != MachineOperand::MO_GlobalAddress ||
1736 !(GO = dyn_cast<const GlobalObject>(MO.getGlobal())))
1737 return PPCAsmPrinter::getMCSymbolForTOCPseudoMO(MO);
1739 // Do an early error check for globals we don't support. This will go away
1741 const auto *GV = dyn_cast<const GlobalVariable>(GO);
1746 MCSymbolXCOFF *XSym = cast<MCSymbolXCOFF>(getSymbol(GO));
1748 // If the global object is a global variable without initializer or is a
1749 // declaration of a function, then XSym is an external referenced symbol.
1750 // Hence we may need to explictly create a MCSectionXCOFF for it so that we
1751 // can return its symbol later.
1752 if (GO->isDeclaration()) {
1753 if (!XSym->hasContainingCsect()) {
1754 // Make sure the storage class is set.
1755 const XCOFF::StorageClass SC =
1756 TargetLoweringObjectFileXCOFF::getStorageClassForGlobal(GO);
1757 XSym->setStorageClass(SC);
1759 MCSectionXCOFF *Csect = OutStreamer->getContext().getXCOFFSection(
1760 XSym->getName(), isa<Function>(GO) ? XCOFF::XMC_DS : XCOFF::XMC_UA,
1761 XCOFF::XTY_ER, SC, SectionKind::getMetadata());
1762 XSym->setContainingCsect(Csect);
1765 return XSym->getContainingCsect()->getQualNameSymbol();
1768 // Handle initialized global variables and defined functions.
1769 SectionKind GOKind = getObjFileLowering().getKindForGlobal(GO, TM);
1771 if (GOKind.isText()) {
1772 // If the MO is a function, we want to make sure to refer to the function
1773 // descriptor csect.
1774 return OutStreamer->getContext()
1775 .getXCOFFSection(XSym->getName(), XCOFF::XMC_DS, XCOFF::XTY_SD,
1776 XCOFF::C_HIDEXT, SectionKind::getData())
1777 ->getQualNameSymbol();
1778 } else if (GOKind.isCommon() || GOKind.isBSSLocal()) {
1779 // If the operand is a common then we should refer to the csect symbol.
1780 return cast<MCSectionXCOFF>(
1781 getObjFileLowering().SectionForGlobal(GO, GOKind, TM))
1782 ->getQualNameSymbol();
1785 // Other global variables are refered to by labels inside of a single csect,
1786 // so refer to the label directly.
1787 return getSymbol(GV);
1790 /// createPPCAsmPrinterPass - Returns a pass that prints the PPC assembly code
1791 /// for a MachineFunction to the given output stream, in a format that the
1792 /// Darwin assembler can deal with.
1795 createPPCAsmPrinterPass(TargetMachine &tm,
1796 std::unique_ptr<MCStreamer> &&Streamer) {
1797 if (tm.getTargetTriple().isOSAIX())
1798 return new PPCAIXAsmPrinter(tm, std::move(Streamer));
1800 return new PPCLinuxAsmPrinter(tm, std::move(Streamer));
1803 // Force static initialization.
1804 extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializePowerPCAsmPrinter() {
1805 TargetRegistry::RegisterAsmPrinter(getThePPC32Target(),
1806 createPPCAsmPrinterPass);
1807 TargetRegistry::RegisterAsmPrinter(getThePPC64Target(),
1808 createPPCAsmPrinterPass);
1809 TargetRegistry::RegisterAsmPrinter(getThePPC64LETarget(),
1810 createPPCAsmPrinterPass);