1 //===- lib/MC/ARMELFStreamer.cpp - ELF Object Output for ARM --------------===//
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 assembles .s files and emits ARM ELF .o object files. Different
11 // from generic ELF streamer in emitting mapping symbols ($a, $t and $d) to
12 // delimit regions of data and code.
14 //===----------------------------------------------------------------------===//
16 #include "ARMRegisterInfo.h"
17 #include "ARMUnwindOpAsm.h"
18 #include "llvm/ADT/DenseMap.h"
19 #include "llvm/ADT/SmallString.h"
20 #include "llvm/ADT/SmallVector.h"
21 #include "llvm/ADT/StringRef.h"
22 #include "llvm/ADT/Triple.h"
23 #include "llvm/ADT/Twine.h"
24 #include "llvm/BinaryFormat/ELF.h"
25 #include "llvm/MC/MCAsmBackend.h"
26 #include "llvm/MC/MCAsmInfo.h"
27 #include "llvm/MC/MCAssembler.h"
28 #include "llvm/MC/MCCodeEmitter.h"
29 #include "llvm/MC/MCContext.h"
30 #include "llvm/MC/MCELFStreamer.h"
31 #include "llvm/MC/MCExpr.h"
32 #include "llvm/MC/MCFixup.h"
33 #include "llvm/MC/MCFragment.h"
34 #include "llvm/MC/MCInst.h"
35 #include "llvm/MC/MCInstPrinter.h"
36 #include "llvm/MC/MCObjectWriter.h"
37 #include "llvm/MC/MCRegisterInfo.h"
38 #include "llvm/MC/MCSection.h"
39 #include "llvm/MC/MCSectionELF.h"
40 #include "llvm/MC/MCStreamer.h"
41 #include "llvm/MC/MCSubtargetInfo.h"
42 #include "llvm/MC/MCSymbol.h"
43 #include "llvm/MC/MCSymbolELF.h"
44 #include "llvm/MC/SectionKind.h"
45 #include "llvm/Support/ARMBuildAttributes.h"
46 #include "llvm/Support/ARMEHABI.h"
47 #include "llvm/Support/Casting.h"
48 #include "llvm/Support/ErrorHandling.h"
49 #include "llvm/Support/FormattedStream.h"
50 #include "llvm/Support/LEB128.h"
51 #include "llvm/Support/TargetParser.h"
52 #include "llvm/Support/raw_ostream.h"
62 static std::string GetAEABIUnwindPersonalityName(unsigned Index) {
63 assert(Index < ARM::EHABI::NUM_PERSONALITY_INDEX &&
64 "Invalid personality index");
65 return (Twine("__aeabi_unwind_cpp_pr") + Twine(Index)).str();
72 class ARMTargetAsmStreamer : public ARMTargetStreamer {
73 formatted_raw_ostream &OS;
74 MCInstPrinter &InstPrinter;
77 void emitFnStart() override;
78 void emitFnEnd() override;
79 void emitCantUnwind() override;
80 void emitPersonality(const MCSymbol *Personality) override;
81 void emitPersonalityIndex(unsigned Index) override;
82 void emitHandlerData() override;
83 void emitSetFP(unsigned FpReg, unsigned SpReg, int64_t Offset = 0) override;
84 void emitMovSP(unsigned Reg, int64_t Offset = 0) override;
85 void emitPad(int64_t Offset) override;
86 void emitRegSave(const SmallVectorImpl<unsigned> &RegList,
87 bool isVector) override;
88 void emitUnwindRaw(int64_t Offset,
89 const SmallVectorImpl<uint8_t> &Opcodes) override;
91 void switchVendor(StringRef Vendor) override;
92 void emitAttribute(unsigned Attribute, unsigned Value) override;
93 void emitTextAttribute(unsigned Attribute, StringRef String) override;
94 void emitIntTextAttribute(unsigned Attribute, unsigned IntValue,
95 StringRef StringValue) override;
96 void emitArch(ARM::ArchKind Arch) override;
97 void emitArchExtension(unsigned ArchExt) override;
98 void emitObjectArch(ARM::ArchKind Arch) override;
99 void emitFPU(unsigned FPU) override;
100 void emitInst(uint32_t Inst, char Suffix = '\0') override;
101 void finishAttributeSection() override;
103 void AnnotateTLSDescriptorSequence(const MCSymbolRefExpr *SRE) override;
104 void emitThumbSet(MCSymbol *Symbol, const MCExpr *Value) override;
107 ARMTargetAsmStreamer(MCStreamer &S, formatted_raw_ostream &OS,
108 MCInstPrinter &InstPrinter, bool VerboseAsm);
111 ARMTargetAsmStreamer::ARMTargetAsmStreamer(MCStreamer &S,
112 formatted_raw_ostream &OS,
113 MCInstPrinter &InstPrinter,
115 : ARMTargetStreamer(S), OS(OS), InstPrinter(InstPrinter),
116 IsVerboseAsm(VerboseAsm) {}
118 void ARMTargetAsmStreamer::emitFnStart() { OS << "\t.fnstart\n"; }
119 void ARMTargetAsmStreamer::emitFnEnd() { OS << "\t.fnend\n"; }
120 void ARMTargetAsmStreamer::emitCantUnwind() { OS << "\t.cantunwind\n"; }
122 void ARMTargetAsmStreamer::emitPersonality(const MCSymbol *Personality) {
123 OS << "\t.personality " << Personality->getName() << '\n';
126 void ARMTargetAsmStreamer::emitPersonalityIndex(unsigned Index) {
127 OS << "\t.personalityindex " << Index << '\n';
130 void ARMTargetAsmStreamer::emitHandlerData() { OS << "\t.handlerdata\n"; }
132 void ARMTargetAsmStreamer::emitSetFP(unsigned FpReg, unsigned SpReg,
135 InstPrinter.printRegName(OS, FpReg);
137 InstPrinter.printRegName(OS, SpReg);
139 OS << ", #" << Offset;
143 void ARMTargetAsmStreamer::emitMovSP(unsigned Reg, int64_t Offset) {
144 assert((Reg != ARM::SP && Reg != ARM::PC) &&
145 "the operand of .movsp cannot be either sp or pc");
148 InstPrinter.printRegName(OS, Reg);
150 OS << ", #" << Offset;
154 void ARMTargetAsmStreamer::emitPad(int64_t Offset) {
155 OS << "\t.pad\t#" << Offset << '\n';
158 void ARMTargetAsmStreamer::emitRegSave(const SmallVectorImpl<unsigned> &RegList,
160 assert(RegList.size() && "RegList should not be empty");
166 InstPrinter.printRegName(OS, RegList[0]);
168 for (unsigned i = 1, e = RegList.size(); i != e; ++i) {
170 InstPrinter.printRegName(OS, RegList[i]);
176 void ARMTargetAsmStreamer::switchVendor(StringRef Vendor) {}
178 void ARMTargetAsmStreamer::emitAttribute(unsigned Attribute, unsigned Value) {
179 OS << "\t.eabi_attribute\t" << Attribute << ", " << Twine(Value);
181 StringRef Name = ARMBuildAttrs::AttrTypeAsString(Attribute);
183 OS << "\t@ " << Name;
188 void ARMTargetAsmStreamer::emitTextAttribute(unsigned Attribute,
191 case ARMBuildAttrs::CPU_name:
192 OS << "\t.cpu\t" << String.lower();
195 OS << "\t.eabi_attribute\t" << Attribute << ", \"" << String << "\"";
197 StringRef Name = ARMBuildAttrs::AttrTypeAsString(Attribute);
199 OS << "\t@ " << Name;
206 void ARMTargetAsmStreamer::emitIntTextAttribute(unsigned Attribute,
208 StringRef StringValue) {
210 default: llvm_unreachable("unsupported multi-value attribute in asm mode");
211 case ARMBuildAttrs::compatibility:
212 OS << "\t.eabi_attribute\t" << Attribute << ", " << IntValue;
213 if (!StringValue.empty())
214 OS << ", \"" << StringValue << "\"";
216 OS << "\t@ " << ARMBuildAttrs::AttrTypeAsString(Attribute);
222 void ARMTargetAsmStreamer::emitArch(ARM::ArchKind Arch) {
223 OS << "\t.arch\t" << ARM::getArchName(Arch) << "\n";
226 void ARMTargetAsmStreamer::emitArchExtension(unsigned ArchExt) {
227 OS << "\t.arch_extension\t" << ARM::getArchExtName(ArchExt) << "\n";
230 void ARMTargetAsmStreamer::emitObjectArch(ARM::ArchKind Arch) {
231 OS << "\t.object_arch\t" << ARM::getArchName(Arch) << '\n';
234 void ARMTargetAsmStreamer::emitFPU(unsigned FPU) {
235 OS << "\t.fpu\t" << ARM::getFPUName(FPU) << "\n";
238 void ARMTargetAsmStreamer::finishAttributeSection() {}
241 ARMTargetAsmStreamer::AnnotateTLSDescriptorSequence(const MCSymbolRefExpr *S) {
242 OS << "\t.tlsdescseq\t" << S->getSymbol().getName();
245 void ARMTargetAsmStreamer::emitThumbSet(MCSymbol *Symbol, const MCExpr *Value) {
246 const MCAsmInfo *MAI = Streamer.getContext().getAsmInfo();
248 OS << "\t.thumb_set\t";
249 Symbol->print(OS, MAI);
251 Value->print(OS, MAI);
255 void ARMTargetAsmStreamer::emitInst(uint32_t Inst, char Suffix) {
259 OS << "\t0x" << Twine::utohexstr(Inst) << "\n";
262 void ARMTargetAsmStreamer::emitUnwindRaw(int64_t Offset,
263 const SmallVectorImpl<uint8_t> &Opcodes) {
264 OS << "\t.unwind_raw " << Offset;
265 for (SmallVectorImpl<uint8_t>::const_iterator OCI = Opcodes.begin(),
268 OS << ", 0x" << Twine::utohexstr(*OCI);
272 class ARMTargetELFStreamer : public ARMTargetStreamer {
274 // This structure holds all attributes, accounting for
275 // their string/numeric value, so we can later emit them
276 // in declaration order, keeping all in the same vector
277 struct AttributeItem {
282 NumericAndTextAttributes
286 std::string StringValue;
288 static bool LessTag(const AttributeItem &LHS, const AttributeItem &RHS) {
289 // The conformance tag must be emitted first when serialised
290 // into an object file. Specifically, the addenda to the ARM ABI
291 // states that (2.3.7.4):
293 // "To simplify recognition by consumers in the common case of
294 // claiming conformity for the whole file, this tag should be
295 // emitted first in a file-scope sub-subsection of the first
296 // public subsection of the attributes section."
298 // So it is special-cased in this comparison predicate when the
299 // attributes are sorted in finishAttributeSection().
300 return (RHS.Tag != ARMBuildAttrs::conformance) &&
301 ((LHS.Tag == ARMBuildAttrs::conformance) || (LHS.Tag < RHS.Tag));
305 StringRef CurrentVendor;
306 unsigned FPU = ARM::FK_INVALID;
307 ARM::ArchKind Arch = ARM::ArchKind::INVALID;
308 ARM::ArchKind EmittedArch = ARM::ArchKind::INVALID;
309 SmallVector<AttributeItem, 64> Contents;
311 MCSection *AttributeSection = nullptr;
313 AttributeItem *getAttributeItem(unsigned Attribute) {
314 for (size_t i = 0; i < Contents.size(); ++i)
315 if (Contents[i].Tag == Attribute)
320 void setAttributeItem(unsigned Attribute, unsigned Value,
321 bool OverwriteExisting) {
322 // Look for existing attribute item
323 if (AttributeItem *Item = getAttributeItem(Attribute)) {
324 if (!OverwriteExisting)
326 Item->Type = AttributeItem::NumericAttribute;
327 Item->IntValue = Value;
331 // Create new attribute item
332 AttributeItem Item = {
333 AttributeItem::NumericAttribute,
338 Contents.push_back(Item);
341 void setAttributeItem(unsigned Attribute, StringRef Value,
342 bool OverwriteExisting) {
343 // Look for existing attribute item
344 if (AttributeItem *Item = getAttributeItem(Attribute)) {
345 if (!OverwriteExisting)
347 Item->Type = AttributeItem::TextAttribute;
348 Item->StringValue = Value;
352 // Create new attribute item
353 AttributeItem Item = {
354 AttributeItem::TextAttribute,
359 Contents.push_back(Item);
362 void setAttributeItems(unsigned Attribute, unsigned IntValue,
363 StringRef StringValue, bool OverwriteExisting) {
364 // Look for existing attribute item
365 if (AttributeItem *Item = getAttributeItem(Attribute)) {
366 if (!OverwriteExisting)
368 Item->Type = AttributeItem::NumericAndTextAttributes;
369 Item->IntValue = IntValue;
370 Item->StringValue = StringValue;
374 // Create new attribute item
375 AttributeItem Item = {
376 AttributeItem::NumericAndTextAttributes,
381 Contents.push_back(Item);
384 void emitArchDefaultAttributes();
385 void emitFPUDefaultAttributes();
387 ARMELFStreamer &getStreamer();
389 void emitFnStart() override;
390 void emitFnEnd() override;
391 void emitCantUnwind() override;
392 void emitPersonality(const MCSymbol *Personality) override;
393 void emitPersonalityIndex(unsigned Index) override;
394 void emitHandlerData() override;
395 void emitSetFP(unsigned FpReg, unsigned SpReg, int64_t Offset = 0) override;
396 void emitMovSP(unsigned Reg, int64_t Offset = 0) override;
397 void emitPad(int64_t Offset) override;
398 void emitRegSave(const SmallVectorImpl<unsigned> &RegList,
399 bool isVector) override;
400 void emitUnwindRaw(int64_t Offset,
401 const SmallVectorImpl<uint8_t> &Opcodes) override;
403 void switchVendor(StringRef Vendor) override;
404 void emitAttribute(unsigned Attribute, unsigned Value) override;
405 void emitTextAttribute(unsigned Attribute, StringRef String) override;
406 void emitIntTextAttribute(unsigned Attribute, unsigned IntValue,
407 StringRef StringValue) override;
408 void emitArch(ARM::ArchKind Arch) override;
409 void emitObjectArch(ARM::ArchKind Arch) override;
410 void emitFPU(unsigned FPU) override;
411 void emitInst(uint32_t Inst, char Suffix = '\0') override;
412 void finishAttributeSection() override;
413 void emitLabel(MCSymbol *Symbol) override;
415 void AnnotateTLSDescriptorSequence(const MCSymbolRefExpr *SRE) override;
416 void emitThumbSet(MCSymbol *Symbol, const MCExpr *Value) override;
418 size_t calculateContentSize() const;
420 // Reset state between object emissions
421 void reset() override;
424 ARMTargetELFStreamer(MCStreamer &S)
425 : ARMTargetStreamer(S), CurrentVendor("aeabi") {}
428 /// Extend the generic ELFStreamer class so that it can emit mapping symbols at
429 /// the appropriate points in the object files. These symbols are defined in the
430 /// ARM ELF ABI: infocenter.arm.com/help/topic/com.arm.../IHI0044D_aaelf.pdf.
432 /// In brief: $a, $t or $d should be emitted at the start of each contiguous
433 /// region of ARM code, Thumb code or data in a section. In practice, this
434 /// emission does not rely on explicit assembler directives but on inherent
435 /// properties of the directives doing the emission (e.g. ".byte" is data, "add
436 /// r0, r0, r0" an instruction).
438 /// As a result this system is orthogonal to the DataRegion infrastructure used
439 /// by MachO. Beware!
440 class ARMELFStreamer : public MCELFStreamer {
442 friend class ARMTargetELFStreamer;
444 ARMELFStreamer(MCContext &Context, std::unique_ptr<MCAsmBackend> TAB,
445 std::unique_ptr<MCObjectWriter> OW, std::unique_ptr<MCCodeEmitter> Emitter,
447 : MCELFStreamer(Context, std::move(TAB), std::move(OW), std::move(Emitter)),
452 ~ARMELFStreamer() override = default;
454 void FinishImpl() override;
456 // ARM exception handling directives
459 void emitCantUnwind();
460 void emitPersonality(const MCSymbol *Per);
461 void emitPersonalityIndex(unsigned index);
462 void emitHandlerData();
463 void emitSetFP(unsigned NewFpReg, unsigned NewSpReg, int64_t Offset = 0);
464 void emitMovSP(unsigned Reg, int64_t Offset = 0);
465 void emitPad(int64_t Offset);
466 void emitRegSave(const SmallVectorImpl<unsigned> &RegList, bool isVector);
467 void emitUnwindRaw(int64_t Offset, const SmallVectorImpl<uint8_t> &Opcodes);
469 void ChangeSection(MCSection *Section, const MCExpr *Subsection) override {
470 LastMappingSymbols[getCurrentSection().first] = std::move(LastEMSInfo);
471 MCELFStreamer::ChangeSection(Section, Subsection);
472 auto LastMappingSymbol = LastMappingSymbols.find(Section);
473 if (LastMappingSymbol != LastMappingSymbols.end()) {
474 LastEMSInfo = std::move(LastMappingSymbol->second);
477 LastEMSInfo.reset(new ElfMappingSymbolInfo(SMLoc(), nullptr, 0));
480 /// This function is the one used to emit instruction data into the ELF
481 /// streamer. We override it to add the appropriate mapping symbol if
483 void EmitInstruction(const MCInst &Inst, const MCSubtargetInfo &STI,
486 EmitThumbMappingSymbol();
488 EmitARMMappingSymbol();
490 MCELFStreamer::EmitInstruction(Inst, STI);
493 void emitInst(uint32_t Inst, char Suffix) {
496 const bool LittleEndian = getContext().getAsmInfo()->isLittleEndian();
503 EmitARMMappingSymbol();
504 for (unsigned II = 0, IE = Size; II != IE; II++) {
505 const unsigned I = LittleEndian ? (Size - II - 1) : II;
506 Buffer[Size - II - 1] = uint8_t(Inst >> I * CHAR_BIT);
512 Size = (Suffix == 'n' ? 2 : 4);
515 EmitThumbMappingSymbol();
516 // Thumb wide instructions are emitted as a pair of 16-bit words of the
517 // appropriate endianness.
518 for (unsigned II = 0, IE = Size; II != IE; II = II + 2) {
519 const unsigned I0 = LittleEndian ? II + 0 : II + 1;
520 const unsigned I1 = LittleEndian ? II + 1 : II + 0;
521 Buffer[Size - II - 2] = uint8_t(Inst >> I0 * CHAR_BIT);
522 Buffer[Size - II - 1] = uint8_t(Inst >> I1 * CHAR_BIT);
527 llvm_unreachable("Invalid Suffix");
530 MCELFStreamer::EmitBytes(StringRef(Buffer, Size));
533 /// This is one of the functions used to emit data into an ELF section, so the
534 /// ARM streamer overrides it to add the appropriate mapping symbol ($d) if
536 void EmitBytes(StringRef Data) override {
537 EmitDataMappingSymbol();
538 MCELFStreamer::EmitBytes(Data);
541 void FlushPendingMappingSymbol() {
542 if (!LastEMSInfo->hasInfo())
544 ElfMappingSymbolInfo *EMS = LastEMSInfo.get();
545 EmitMappingSymbol("$d", EMS->Loc, EMS->F, EMS->Offset);
549 /// This is one of the functions used to emit data into an ELF section, so the
550 /// ARM streamer overrides it to add the appropriate mapping symbol ($d) if
552 void EmitValueImpl(const MCExpr *Value, unsigned Size, SMLoc Loc) override {
553 if (const MCSymbolRefExpr *SRE = dyn_cast_or_null<MCSymbolRefExpr>(Value)) {
554 if (SRE->getKind() == MCSymbolRefExpr::VK_ARM_SBREL && !(Size == 4)) {
555 getContext().reportError(Loc, "relocated expression must be 32-bit");
558 getOrCreateDataFragment();
561 EmitDataMappingSymbol();
562 MCELFStreamer::EmitValueImpl(Value, Size, Loc);
565 void EmitAssemblerFlag(MCAssemblerFlag Flag) override {
566 MCELFStreamer::EmitAssemblerFlag(Flag);
569 case MCAF_SyntaxUnified:
570 return; // no-op here.
573 return; // Change to Thumb mode
576 return; // Change to ARM mode
579 case MCAF_SubsectionsViaSymbols:
585 enum ElfMappingSymbol {
592 struct ElfMappingSymbolInfo {
593 explicit ElfMappingSymbolInfo(SMLoc Loc, MCFragment *F, uint64_t O)
594 : Loc(Loc), F(F), Offset(O), State(EMS_None) {}
599 bool hasInfo() { return F != nullptr; }
603 ElfMappingSymbol State;
606 void EmitDataMappingSymbol() {
607 if (LastEMSInfo->State == EMS_Data)
609 else if (LastEMSInfo->State == EMS_None) {
610 // This is a tentative symbol, it won't really be emitted until it's
612 ElfMappingSymbolInfo *EMS = LastEMSInfo.get();
613 auto *DF = dyn_cast_or_null<MCDataFragment>(getCurrentFragment());
617 EMS->F = getCurrentFragment();
618 EMS->Offset = DF->getContents().size();
619 LastEMSInfo->State = EMS_Data;
622 EmitMappingSymbol("$d");
623 LastEMSInfo->State = EMS_Data;
626 void EmitThumbMappingSymbol() {
627 if (LastEMSInfo->State == EMS_Thumb)
629 FlushPendingMappingSymbol();
630 EmitMappingSymbol("$t");
631 LastEMSInfo->State = EMS_Thumb;
634 void EmitARMMappingSymbol() {
635 if (LastEMSInfo->State == EMS_ARM)
637 FlushPendingMappingSymbol();
638 EmitMappingSymbol("$a");
639 LastEMSInfo->State = EMS_ARM;
642 void EmitMappingSymbol(StringRef Name) {
643 auto *Symbol = cast<MCSymbolELF>(getContext().getOrCreateSymbol(
644 Name + "." + Twine(MappingSymbolCounter++)));
647 Symbol->setType(ELF::STT_NOTYPE);
648 Symbol->setBinding(ELF::STB_LOCAL);
649 Symbol->setExternal(false);
652 void EmitMappingSymbol(StringRef Name, SMLoc Loc, MCFragment *F,
654 auto *Symbol = cast<MCSymbolELF>(getContext().getOrCreateSymbol(
655 Name + "." + Twine(MappingSymbolCounter++)));
656 EmitLabel(Symbol, Loc, F);
657 Symbol->setType(ELF::STT_NOTYPE);
658 Symbol->setBinding(ELF::STB_LOCAL);
659 Symbol->setExternal(false);
660 Symbol->setOffset(Offset);
663 void EmitThumbFunc(MCSymbol *Func) override {
664 getAssembler().setIsThumbFunc(Func);
665 EmitSymbolAttribute(Func, MCSA_ELF_TypeFunction);
668 // Helper functions for ARM exception handling directives
671 // Reset state between object emissions
672 void reset() override;
674 void EmitPersonalityFixup(StringRef Name);
675 void FlushPendingOffset();
676 void FlushUnwindOpcodes(bool NoHandlerData);
678 void SwitchToEHSection(StringRef Prefix, unsigned Type, unsigned Flags,
679 SectionKind Kind, const MCSymbol &Fn);
680 void SwitchToExTabSection(const MCSymbol &FnStart);
681 void SwitchToExIdxSection(const MCSymbol &FnStart);
683 void EmitFixup(const MCExpr *Expr, MCFixupKind Kind);
686 int64_t MappingSymbolCounter = 0;
688 DenseMap<const MCSection *, std::unique_ptr<ElfMappingSymbolInfo>>
691 std::unique_ptr<ElfMappingSymbolInfo> LastEMSInfo;
693 // ARM Exception Handling Frame Information
696 const MCSymbol *Personality;
697 unsigned PersonalityIndex;
698 unsigned FPReg; // Frame pointer register
699 int64_t FPOffset; // Offset: (final frame pointer) - (initial $sp)
700 int64_t SPOffset; // Offset: (final $sp) - (initial $sp)
701 int64_t PendingOffset; // Offset: (final $sp) - (emitted $sp)
704 SmallVector<uint8_t, 64> Opcodes;
705 UnwindOpcodeAssembler UnwindOpAsm;
708 } // end anonymous namespace
710 ARMELFStreamer &ARMTargetELFStreamer::getStreamer() {
711 return static_cast<ARMELFStreamer &>(Streamer);
714 void ARMTargetELFStreamer::emitFnStart() { getStreamer().emitFnStart(); }
715 void ARMTargetELFStreamer::emitFnEnd() { getStreamer().emitFnEnd(); }
716 void ARMTargetELFStreamer::emitCantUnwind() { getStreamer().emitCantUnwind(); }
718 void ARMTargetELFStreamer::emitPersonality(const MCSymbol *Personality) {
719 getStreamer().emitPersonality(Personality);
722 void ARMTargetELFStreamer::emitPersonalityIndex(unsigned Index) {
723 getStreamer().emitPersonalityIndex(Index);
726 void ARMTargetELFStreamer::emitHandlerData() {
727 getStreamer().emitHandlerData();
730 void ARMTargetELFStreamer::emitSetFP(unsigned FpReg, unsigned SpReg,
732 getStreamer().emitSetFP(FpReg, SpReg, Offset);
735 void ARMTargetELFStreamer::emitMovSP(unsigned Reg, int64_t Offset) {
736 getStreamer().emitMovSP(Reg, Offset);
739 void ARMTargetELFStreamer::emitPad(int64_t Offset) {
740 getStreamer().emitPad(Offset);
743 void ARMTargetELFStreamer::emitRegSave(const SmallVectorImpl<unsigned> &RegList,
745 getStreamer().emitRegSave(RegList, isVector);
748 void ARMTargetELFStreamer::emitUnwindRaw(int64_t Offset,
749 const SmallVectorImpl<uint8_t> &Opcodes) {
750 getStreamer().emitUnwindRaw(Offset, Opcodes);
753 void ARMTargetELFStreamer::switchVendor(StringRef Vendor) {
754 assert(!Vendor.empty() && "Vendor cannot be empty.");
756 if (CurrentVendor == Vendor)
759 if (!CurrentVendor.empty())
760 finishAttributeSection();
762 assert(Contents.empty() &&
763 ".ARM.attributes should be flushed before changing vendor");
764 CurrentVendor = Vendor;
768 void ARMTargetELFStreamer::emitAttribute(unsigned Attribute, unsigned Value) {
769 setAttributeItem(Attribute, Value, /* OverwriteExisting= */ true);
772 void ARMTargetELFStreamer::emitTextAttribute(unsigned Attribute,
774 setAttributeItem(Attribute, Value, /* OverwriteExisting= */ true);
777 void ARMTargetELFStreamer::emitIntTextAttribute(unsigned Attribute,
779 StringRef StringValue) {
780 setAttributeItems(Attribute, IntValue, StringValue,
781 /* OverwriteExisting= */ true);
784 void ARMTargetELFStreamer::emitArch(ARM::ArchKind Value) {
788 void ARMTargetELFStreamer::emitObjectArch(ARM::ArchKind Value) {
792 void ARMTargetELFStreamer::emitArchDefaultAttributes() {
793 using namespace ARMBuildAttrs;
795 setAttributeItem(CPU_name,
796 ARM::getCPUAttr(Arch),
799 if (EmittedArch == ARM::ArchKind::INVALID)
800 setAttributeItem(CPU_arch,
801 ARM::getArchAttr(Arch),
804 setAttributeItem(CPU_arch,
805 ARM::getArchAttr(EmittedArch),
809 case ARM::ArchKind::ARMV2:
810 case ARM::ArchKind::ARMV2A:
811 case ARM::ArchKind::ARMV3:
812 case ARM::ArchKind::ARMV3M:
813 case ARM::ArchKind::ARMV4:
814 setAttributeItem(ARM_ISA_use, Allowed, false);
817 case ARM::ArchKind::ARMV4T:
818 case ARM::ArchKind::ARMV5T:
819 case ARM::ArchKind::ARMV5TE:
820 case ARM::ArchKind::ARMV6:
821 setAttributeItem(ARM_ISA_use, Allowed, false);
822 setAttributeItem(THUMB_ISA_use, Allowed, false);
825 case ARM::ArchKind::ARMV6T2:
826 setAttributeItem(ARM_ISA_use, Allowed, false);
827 setAttributeItem(THUMB_ISA_use, AllowThumb32, false);
830 case ARM::ArchKind::ARMV6K:
831 case ARM::ArchKind::ARMV6KZ:
832 setAttributeItem(ARM_ISA_use, Allowed, false);
833 setAttributeItem(THUMB_ISA_use, Allowed, false);
834 setAttributeItem(Virtualization_use, AllowTZ, false);
837 case ARM::ArchKind::ARMV6M:
838 setAttributeItem(THUMB_ISA_use, Allowed, false);
841 case ARM::ArchKind::ARMV7A:
842 setAttributeItem(CPU_arch_profile, ApplicationProfile, false);
843 setAttributeItem(ARM_ISA_use, Allowed, false);
844 setAttributeItem(THUMB_ISA_use, AllowThumb32, false);
847 case ARM::ArchKind::ARMV7R:
848 setAttributeItem(CPU_arch_profile, RealTimeProfile, false);
849 setAttributeItem(ARM_ISA_use, Allowed, false);
850 setAttributeItem(THUMB_ISA_use, AllowThumb32, false);
853 case ARM::ArchKind::ARMV7EM:
854 case ARM::ArchKind::ARMV7M:
855 setAttributeItem(CPU_arch_profile, MicroControllerProfile, false);
856 setAttributeItem(THUMB_ISA_use, AllowThumb32, false);
859 case ARM::ArchKind::ARMV8A:
860 case ARM::ArchKind::ARMV8_1A:
861 case ARM::ArchKind::ARMV8_2A:
862 case ARM::ArchKind::ARMV8_3A:
863 case ARM::ArchKind::ARMV8_4A:
864 setAttributeItem(CPU_arch_profile, ApplicationProfile, false);
865 setAttributeItem(ARM_ISA_use, Allowed, false);
866 setAttributeItem(THUMB_ISA_use, AllowThumb32, false);
867 setAttributeItem(MPextension_use, Allowed, false);
868 setAttributeItem(Virtualization_use, AllowTZVirtualization, false);
871 case ARM::ArchKind::ARMV8MBaseline:
872 case ARM::ArchKind::ARMV8MMainline:
873 setAttributeItem(THUMB_ISA_use, AllowThumbDerived, false);
874 setAttributeItem(CPU_arch_profile, MicroControllerProfile, false);
877 case ARM::ArchKind::IWMMXT:
878 setAttributeItem(ARM_ISA_use, Allowed, false);
879 setAttributeItem(THUMB_ISA_use, Allowed, false);
880 setAttributeItem(WMMX_arch, AllowWMMXv1, false);
883 case ARM::ArchKind::IWMMXT2:
884 setAttributeItem(ARM_ISA_use, Allowed, false);
885 setAttributeItem(THUMB_ISA_use, Allowed, false);
886 setAttributeItem(WMMX_arch, AllowWMMXv2, false);
890 report_fatal_error("Unknown Arch: " + Twine(ARM::getArchName(Arch)));
895 void ARMTargetELFStreamer::emitFPU(unsigned Value) {
899 void ARMTargetELFStreamer::emitFPUDefaultAttributes() {
903 setAttributeItem(ARMBuildAttrs::FP_arch,
904 ARMBuildAttrs::AllowFPv2,
905 /* OverwriteExisting= */ false);
909 setAttributeItem(ARMBuildAttrs::FP_arch,
910 ARMBuildAttrs::AllowFPv3A,
911 /* OverwriteExisting= */ false);
914 case ARM::FK_VFPV3_FP16:
915 setAttributeItem(ARMBuildAttrs::FP_arch,
916 ARMBuildAttrs::AllowFPv3A,
917 /* OverwriteExisting= */ false);
918 setAttributeItem(ARMBuildAttrs::FP_HP_extension,
919 ARMBuildAttrs::AllowHPFP,
920 /* OverwriteExisting= */ false);
923 case ARM::FK_VFPV3_D16:
924 setAttributeItem(ARMBuildAttrs::FP_arch,
925 ARMBuildAttrs::AllowFPv3B,
926 /* OverwriteExisting= */ false);
929 case ARM::FK_VFPV3_D16_FP16:
930 setAttributeItem(ARMBuildAttrs::FP_arch,
931 ARMBuildAttrs::AllowFPv3B,
932 /* OverwriteExisting= */ false);
933 setAttributeItem(ARMBuildAttrs::FP_HP_extension,
934 ARMBuildAttrs::AllowHPFP,
935 /* OverwriteExisting= */ false);
938 case ARM::FK_VFPV3XD:
939 setAttributeItem(ARMBuildAttrs::FP_arch,
940 ARMBuildAttrs::AllowFPv3B,
941 /* OverwriteExisting= */ false);
943 case ARM::FK_VFPV3XD_FP16:
944 setAttributeItem(ARMBuildAttrs::FP_arch,
945 ARMBuildAttrs::AllowFPv3B,
946 /* OverwriteExisting= */ false);
947 setAttributeItem(ARMBuildAttrs::FP_HP_extension,
948 ARMBuildAttrs::AllowHPFP,
949 /* OverwriteExisting= */ false);
953 setAttributeItem(ARMBuildAttrs::FP_arch,
954 ARMBuildAttrs::AllowFPv4A,
955 /* OverwriteExisting= */ false);
958 // ABI_HardFP_use is handled in ARMAsmPrinter, so _SP_D16 is treated the same
960 case ARM::FK_FPV4_SP_D16:
961 case ARM::FK_VFPV4_D16:
962 setAttributeItem(ARMBuildAttrs::FP_arch,
963 ARMBuildAttrs::AllowFPv4B,
964 /* OverwriteExisting= */ false);
967 case ARM::FK_FP_ARMV8:
968 setAttributeItem(ARMBuildAttrs::FP_arch,
969 ARMBuildAttrs::AllowFPARMv8A,
970 /* OverwriteExisting= */ false);
973 // FPV5_D16 is identical to FP_ARMV8 except for the number of D registers, so
974 // uses the FP_ARMV8_D16 build attribute.
975 case ARM::FK_FPV5_SP_D16:
976 case ARM::FK_FPV5_D16:
977 setAttributeItem(ARMBuildAttrs::FP_arch,
978 ARMBuildAttrs::AllowFPARMv8B,
979 /* OverwriteExisting= */ false);
983 setAttributeItem(ARMBuildAttrs::FP_arch,
984 ARMBuildAttrs::AllowFPv3A,
985 /* OverwriteExisting= */ false);
986 setAttributeItem(ARMBuildAttrs::Advanced_SIMD_arch,
987 ARMBuildAttrs::AllowNeon,
988 /* OverwriteExisting= */ false);
991 case ARM::FK_NEON_FP16:
992 setAttributeItem(ARMBuildAttrs::FP_arch,
993 ARMBuildAttrs::AllowFPv3A,
994 /* OverwriteExisting= */ false);
995 setAttributeItem(ARMBuildAttrs::Advanced_SIMD_arch,
996 ARMBuildAttrs::AllowNeon,
997 /* OverwriteExisting= */ false);
998 setAttributeItem(ARMBuildAttrs::FP_HP_extension,
999 ARMBuildAttrs::AllowHPFP,
1000 /* OverwriteExisting= */ false);
1003 case ARM::FK_NEON_VFPV4:
1004 setAttributeItem(ARMBuildAttrs::FP_arch,
1005 ARMBuildAttrs::AllowFPv4A,
1006 /* OverwriteExisting= */ false);
1007 setAttributeItem(ARMBuildAttrs::Advanced_SIMD_arch,
1008 ARMBuildAttrs::AllowNeon2,
1009 /* OverwriteExisting= */ false);
1012 case ARM::FK_NEON_FP_ARMV8:
1013 case ARM::FK_CRYPTO_NEON_FP_ARMV8:
1014 setAttributeItem(ARMBuildAttrs::FP_arch,
1015 ARMBuildAttrs::AllowFPARMv8A,
1016 /* OverwriteExisting= */ false);
1017 // 'Advanced_SIMD_arch' must be emitted not here, but within
1018 // ARMAsmPrinter::emitAttributes(), depending on hasV8Ops() and hasV8_1a()
1021 case ARM::FK_SOFTVFP:
1026 report_fatal_error("Unknown FPU: " + Twine(FPU));
1031 size_t ARMTargetELFStreamer::calculateContentSize() const {
1033 for (size_t i = 0; i < Contents.size(); ++i) {
1034 AttributeItem item = Contents[i];
1035 switch (item.Type) {
1036 case AttributeItem::HiddenAttribute:
1038 case AttributeItem::NumericAttribute:
1039 Result += getULEB128Size(item.Tag);
1040 Result += getULEB128Size(item.IntValue);
1042 case AttributeItem::TextAttribute:
1043 Result += getULEB128Size(item.Tag);
1044 Result += item.StringValue.size() + 1; // string + '\0'
1046 case AttributeItem::NumericAndTextAttributes:
1047 Result += getULEB128Size(item.Tag);
1048 Result += getULEB128Size(item.IntValue);
1049 Result += item.StringValue.size() + 1; // string + '\0';
1056 void ARMTargetELFStreamer::finishAttributeSection() {
1058 // [ <section-length> "vendor-name"
1059 // [ <file-tag> <size> <attribute>*
1060 // | <section-tag> <size> <section-number>* 0 <attribute>*
1061 // | <symbol-tag> <size> <symbol-number>* 0 <attribute>*
1065 if (FPU != ARM::FK_INVALID)
1066 emitFPUDefaultAttributes();
1068 if (Arch != ARM::ArchKind::INVALID)
1069 emitArchDefaultAttributes();
1071 if (Contents.empty())
1074 llvm::sort(Contents.begin(), Contents.end(), AttributeItem::LessTag);
1076 ARMELFStreamer &Streamer = getStreamer();
1078 // Switch to .ARM.attributes section
1079 if (AttributeSection) {
1080 Streamer.SwitchSection(AttributeSection);
1082 AttributeSection = Streamer.getContext().getELFSection(
1083 ".ARM.attributes", ELF::SHT_ARM_ATTRIBUTES, 0);
1084 Streamer.SwitchSection(AttributeSection);
1087 Streamer.EmitIntValue(0x41, 1);
1090 // Vendor size + Vendor name + '\0'
1091 const size_t VendorHeaderSize = 4 + CurrentVendor.size() + 1;
1094 const size_t TagHeaderSize = 1 + 4;
1096 const size_t ContentsSize = calculateContentSize();
1098 Streamer.EmitIntValue(VendorHeaderSize + TagHeaderSize + ContentsSize, 4);
1099 Streamer.EmitBytes(CurrentVendor);
1100 Streamer.EmitIntValue(0, 1); // '\0'
1102 Streamer.EmitIntValue(ARMBuildAttrs::File, 1);
1103 Streamer.EmitIntValue(TagHeaderSize + ContentsSize, 4);
1105 // Size should have been accounted for already, now
1106 // emit each field as its type (ULEB or String)
1107 for (size_t i = 0; i < Contents.size(); ++i) {
1108 AttributeItem item = Contents[i];
1109 Streamer.EmitULEB128IntValue(item.Tag);
1110 switch (item.Type) {
1111 default: llvm_unreachable("Invalid attribute type");
1112 case AttributeItem::NumericAttribute:
1113 Streamer.EmitULEB128IntValue(item.IntValue);
1115 case AttributeItem::TextAttribute:
1116 Streamer.EmitBytes(item.StringValue);
1117 Streamer.EmitIntValue(0, 1); // '\0'
1119 case AttributeItem::NumericAndTextAttributes:
1120 Streamer.EmitULEB128IntValue(item.IntValue);
1121 Streamer.EmitBytes(item.StringValue);
1122 Streamer.EmitIntValue(0, 1); // '\0'
1128 FPU = ARM::FK_INVALID;
1131 void ARMTargetELFStreamer::emitLabel(MCSymbol *Symbol) {
1132 ARMELFStreamer &Streamer = getStreamer();
1133 if (!Streamer.IsThumb)
1136 Streamer.getAssembler().registerSymbol(*Symbol);
1137 unsigned Type = cast<MCSymbolELF>(Symbol)->getType();
1138 if (Type == ELF::STT_FUNC || Type == ELF::STT_GNU_IFUNC)
1139 Streamer.EmitThumbFunc(Symbol);
1143 ARMTargetELFStreamer::AnnotateTLSDescriptorSequence(const MCSymbolRefExpr *S) {
1144 getStreamer().EmitFixup(S, FK_Data_4);
1147 void ARMTargetELFStreamer::emitThumbSet(MCSymbol *Symbol, const MCExpr *Value) {
1148 if (const MCSymbolRefExpr *SRE = dyn_cast<MCSymbolRefExpr>(Value)) {
1149 const MCSymbol &Sym = SRE->getSymbol();
1150 if (!Sym.isDefined()) {
1151 getStreamer().EmitAssignment(Symbol, Value);
1156 getStreamer().EmitThumbFunc(Symbol);
1157 getStreamer().EmitAssignment(Symbol, Value);
1160 void ARMTargetELFStreamer::emitInst(uint32_t Inst, char Suffix) {
1161 getStreamer().emitInst(Inst, Suffix);
1164 void ARMTargetELFStreamer::reset() { AttributeSection = nullptr; }
1166 void ARMELFStreamer::FinishImpl() {
1167 MCTargetStreamer &TS = *getTargetStreamer();
1168 ARMTargetStreamer &ATS = static_cast<ARMTargetStreamer &>(TS);
1169 ATS.finishAttributeSection();
1171 MCELFStreamer::FinishImpl();
1174 void ARMELFStreamer::reset() {
1175 MCTargetStreamer &TS = *getTargetStreamer();
1176 ARMTargetStreamer &ATS = static_cast<ARMTargetStreamer &>(TS);
1178 MappingSymbolCounter = 0;
1179 MCELFStreamer::reset();
1180 LastMappingSymbols.clear();
1181 LastEMSInfo.reset();
1182 // MCELFStreamer clear's the assembler's e_flags. However, for
1183 // arm we manually set the ABI version on streamer creation, so
1185 getAssembler().setELFHeaderEFlags(ELF::EF_ARM_EABI_VER5);
1188 inline void ARMELFStreamer::SwitchToEHSection(StringRef Prefix,
1192 const MCSymbol &Fn) {
1193 const MCSectionELF &FnSection =
1194 static_cast<const MCSectionELF &>(Fn.getSection());
1196 // Create the name for new section
1197 StringRef FnSecName(FnSection.getSectionName());
1198 SmallString<128> EHSecName(Prefix);
1199 if (FnSecName != ".text") {
1200 EHSecName += FnSecName;
1203 // Get .ARM.extab or .ARM.exidx section
1204 const MCSymbolELF *Group = FnSection.getGroup();
1206 Flags |= ELF::SHF_GROUP;
1207 MCSectionELF *EHSection = getContext().getELFSection(
1208 EHSecName, Type, Flags, 0, Group, FnSection.getUniqueID(),
1209 static_cast<const MCSymbolELF *>(&Fn));
1211 assert(EHSection && "Failed to get the required EH section");
1213 // Switch to .ARM.extab or .ARM.exidx section
1214 SwitchSection(EHSection);
1215 EmitCodeAlignment(4);
1218 inline void ARMELFStreamer::SwitchToExTabSection(const MCSymbol &FnStart) {
1219 SwitchToEHSection(".ARM.extab", ELF::SHT_PROGBITS, ELF::SHF_ALLOC,
1220 SectionKind::getData(), FnStart);
1223 inline void ARMELFStreamer::SwitchToExIdxSection(const MCSymbol &FnStart) {
1224 SwitchToEHSection(".ARM.exidx", ELF::SHT_ARM_EXIDX,
1225 ELF::SHF_ALLOC | ELF::SHF_LINK_ORDER,
1226 SectionKind::getData(), FnStart);
1229 void ARMELFStreamer::EmitFixup(const MCExpr *Expr, MCFixupKind Kind) {
1230 MCDataFragment *Frag = getOrCreateDataFragment();
1231 Frag->getFixups().push_back(MCFixup::create(Frag->getContents().size(), Expr,
1235 void ARMELFStreamer::EHReset() {
1238 Personality = nullptr;
1239 PersonalityIndex = ARM::EHABI::NUM_PERSONALITY_INDEX;
1248 UnwindOpAsm.Reset();
1251 void ARMELFStreamer::emitFnStart() {
1252 assert(FnStart == nullptr);
1253 FnStart = getContext().createTempSymbol();
1257 void ARMELFStreamer::emitFnEnd() {
1258 assert(FnStart && ".fnstart must precedes .fnend");
1260 // Emit unwind opcodes if there is no .handlerdata directive
1261 if (!ExTab && !CantUnwind)
1262 FlushUnwindOpcodes(true);
1264 // Emit the exception index table entry
1265 SwitchToExIdxSection(*FnStart);
1267 if (PersonalityIndex < ARM::EHABI::NUM_PERSONALITY_INDEX)
1268 EmitPersonalityFixup(GetAEABIUnwindPersonalityName(PersonalityIndex));
1270 const MCSymbolRefExpr *FnStartRef =
1271 MCSymbolRefExpr::create(FnStart,
1272 MCSymbolRefExpr::VK_ARM_PREL31,
1275 EmitValue(FnStartRef, 4);
1278 EmitIntValue(ARM::EHABI::EXIDX_CANTUNWIND, 4);
1280 // Emit a reference to the unwind opcodes in the ".ARM.extab" section.
1281 const MCSymbolRefExpr *ExTabEntryRef =
1282 MCSymbolRefExpr::create(ExTab,
1283 MCSymbolRefExpr::VK_ARM_PREL31,
1285 EmitValue(ExTabEntryRef, 4);
1287 // For the __aeabi_unwind_cpp_pr0, we have to emit the unwind opcodes in
1288 // the second word of exception index table entry. The size of the unwind
1289 // opcodes should always be 4 bytes.
1290 assert(PersonalityIndex == ARM::EHABI::AEABI_UNWIND_CPP_PR0 &&
1291 "Compact model must use __aeabi_unwind_cpp_pr0 as personality");
1292 assert(Opcodes.size() == 4u &&
1293 "Unwind opcode size for __aeabi_unwind_cpp_pr0 must be equal to 4");
1294 uint64_t Intval = Opcodes[0] |
1298 EmitIntValue(Intval, Opcodes.size());
1301 // Switch to the section containing FnStart
1302 SwitchSection(&FnStart->getSection());
1304 // Clean exception handling frame information
1308 void ARMELFStreamer::emitCantUnwind() { CantUnwind = true; }
1310 // Add the R_ARM_NONE fixup at the same position
1311 void ARMELFStreamer::EmitPersonalityFixup(StringRef Name) {
1312 const MCSymbol *PersonalitySym = getContext().getOrCreateSymbol(Name);
1314 const MCSymbolRefExpr *PersonalityRef = MCSymbolRefExpr::create(
1315 PersonalitySym, MCSymbolRefExpr::VK_ARM_NONE, getContext());
1317 visitUsedExpr(*PersonalityRef);
1318 MCDataFragment *DF = getOrCreateDataFragment();
1319 DF->getFixups().push_back(MCFixup::create(DF->getContents().size(),
1321 MCFixup::getKindForSize(4, false)));
1324 void ARMELFStreamer::FlushPendingOffset() {
1325 if (PendingOffset != 0) {
1326 UnwindOpAsm.EmitSPOffset(-PendingOffset);
1331 void ARMELFStreamer::FlushUnwindOpcodes(bool NoHandlerData) {
1332 // Emit the unwind opcode to restore $sp.
1334 const MCRegisterInfo *MRI = getContext().getRegisterInfo();
1335 int64_t LastRegSaveSPOffset = SPOffset - PendingOffset;
1336 UnwindOpAsm.EmitSPOffset(LastRegSaveSPOffset - FPOffset);
1337 UnwindOpAsm.EmitSetSP(MRI->getEncodingValue(FPReg));
1339 FlushPendingOffset();
1342 // Finalize the unwind opcode sequence
1343 UnwindOpAsm.Finalize(PersonalityIndex, Opcodes);
1345 // For compact model 0, we have to emit the unwind opcodes in the .ARM.exidx
1346 // section. Thus, we don't have to create an entry in the .ARM.extab
1348 if (NoHandlerData && PersonalityIndex == ARM::EHABI::AEABI_UNWIND_CPP_PR0)
1351 // Switch to .ARM.extab section.
1352 SwitchToExTabSection(*FnStart);
1354 // Create .ARM.extab label for offset in .ARM.exidx
1356 ExTab = getContext().createTempSymbol();
1361 const MCSymbolRefExpr *PersonalityRef =
1362 MCSymbolRefExpr::create(Personality,
1363 MCSymbolRefExpr::VK_ARM_PREL31,
1366 EmitValue(PersonalityRef, 4);
1369 // Emit unwind opcodes
1370 assert((Opcodes.size() % 4) == 0 &&
1371 "Unwind opcode size for __aeabi_cpp_unwind_pr0 must be multiple of 4");
1372 for (unsigned I = 0; I != Opcodes.size(); I += 4) {
1373 uint64_t Intval = Opcodes[I] |
1374 Opcodes[I + 1] << 8 |
1375 Opcodes[I + 2] << 16 |
1376 Opcodes[I + 3] << 24;
1377 EmitIntValue(Intval, 4);
1380 // According to ARM EHABI section 9.2, if the __aeabi_unwind_cpp_pr1() or
1381 // __aeabi_unwind_cpp_pr2() is used, then the handler data must be emitted
1382 // after the unwind opcodes. The handler data consists of several 32-bit
1383 // words, and should be terminated by zero.
1385 // In case that the .handlerdata directive is not specified by the
1386 // programmer, we should emit zero to terminate the handler data.
1387 if (NoHandlerData && !Personality)
1391 void ARMELFStreamer::emitHandlerData() { FlushUnwindOpcodes(false); }
1393 void ARMELFStreamer::emitPersonality(const MCSymbol *Per) {
1395 UnwindOpAsm.setPersonality(Per);
1398 void ARMELFStreamer::emitPersonalityIndex(unsigned Index) {
1399 assert(Index < ARM::EHABI::NUM_PERSONALITY_INDEX && "invalid index");
1400 PersonalityIndex = Index;
1403 void ARMELFStreamer::emitSetFP(unsigned NewFPReg, unsigned NewSPReg,
1405 assert((NewSPReg == ARM::SP || NewSPReg == FPReg) &&
1406 "the operand of .setfp directive should be either $sp or $fp");
1411 if (NewSPReg == ARM::SP)
1412 FPOffset = SPOffset + Offset;
1417 void ARMELFStreamer::emitMovSP(unsigned Reg, int64_t Offset) {
1418 assert((Reg != ARM::SP && Reg != ARM::PC) &&
1419 "the operand of .movsp cannot be either sp or pc");
1420 assert(FPReg == ARM::SP && "current FP must be SP");
1422 FlushPendingOffset();
1425 FPOffset = SPOffset + Offset;
1427 const MCRegisterInfo *MRI = getContext().getRegisterInfo();
1428 UnwindOpAsm.EmitSetSP(MRI->getEncodingValue(FPReg));
1431 void ARMELFStreamer::emitPad(int64_t Offset) {
1432 // Track the change of the $sp offset
1435 // To squash multiple .pad directives, we should delay the unwind opcode
1436 // until the .save, .vsave, .handlerdata, or .fnend directives.
1437 PendingOffset -= Offset;
1440 void ARMELFStreamer::emitRegSave(const SmallVectorImpl<unsigned> &RegList,
1442 // Collect the registers in the register list
1445 const MCRegisterInfo *MRI = getContext().getRegisterInfo();
1446 for (size_t i = 0; i < RegList.size(); ++i) {
1447 unsigned Reg = MRI->getEncodingValue(RegList[i]);
1448 assert(Reg < (IsVector ? 32U : 16U) && "Register out of range");
1449 unsigned Bit = (1u << Reg);
1450 if ((Mask & Bit) == 0) {
1456 // Track the change the $sp offset: For the .save directive, the
1457 // corresponding push instruction will decrease the $sp by (4 * Count).
1458 // For the .vsave directive, the corresponding vpush instruction will
1459 // decrease $sp by (8 * Count).
1460 SPOffset -= Count * (IsVector ? 8 : 4);
1463 FlushPendingOffset();
1465 UnwindOpAsm.EmitVFPRegSave(Mask);
1467 UnwindOpAsm.EmitRegSave(Mask);
1470 void ARMELFStreamer::emitUnwindRaw(int64_t Offset,
1471 const SmallVectorImpl<uint8_t> &Opcodes) {
1472 FlushPendingOffset();
1473 SPOffset = SPOffset - Offset;
1474 UnwindOpAsm.EmitRaw(Opcodes);
1479 MCTargetStreamer *createARMTargetAsmStreamer(MCStreamer &S,
1480 formatted_raw_ostream &OS,
1481 MCInstPrinter *InstPrint,
1482 bool isVerboseAsm) {
1483 return new ARMTargetAsmStreamer(S, OS, *InstPrint, isVerboseAsm);
1486 MCTargetStreamer *createARMNullTargetStreamer(MCStreamer &S) {
1487 return new ARMTargetStreamer(S);
1490 MCTargetStreamer *createARMObjectTargetStreamer(MCStreamer &S,
1491 const MCSubtargetInfo &STI) {
1492 const Triple &TT = STI.getTargetTriple();
1493 if (TT.isOSBinFormatELF())
1494 return new ARMTargetELFStreamer(S);
1495 return new ARMTargetStreamer(S);
1498 MCELFStreamer *createARMELFStreamer(MCContext &Context,
1499 std::unique_ptr<MCAsmBackend> TAB,
1500 std::unique_ptr<MCObjectWriter> OW,
1501 std::unique_ptr<MCCodeEmitter> Emitter,
1502 bool RelaxAll, bool IsThumb) {
1503 ARMELFStreamer *S = new ARMELFStreamer(Context, std::move(TAB), std::move(OW),
1504 std::move(Emitter), IsThumb);
1505 // FIXME: This should eventually end up somewhere else where more
1506 // intelligent flag decisions can be made. For now we are just maintaining
1507 // the status quo for ARM and setting EF_ARM_EABI_VER5 as the default.
1508 S->getAssembler().setELFHeaderEFlags(ELF::EF_ARM_EABI_VER5);
1511 S->getAssembler().setRelaxAll(true);
1515 } // end namespace llvm