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);
468 void emitFill(const MCExpr &NumBytes, uint64_t FillValue,
469 SMLoc Loc) override {
470 EmitDataMappingSymbol();
471 MCObjectStreamer::emitFill(NumBytes, FillValue, Loc);
474 void ChangeSection(MCSection *Section, const MCExpr *Subsection) override {
475 LastMappingSymbols[getCurrentSection().first] = std::move(LastEMSInfo);
476 MCELFStreamer::ChangeSection(Section, Subsection);
477 auto LastMappingSymbol = LastMappingSymbols.find(Section);
478 if (LastMappingSymbol != LastMappingSymbols.end()) {
479 LastEMSInfo = std::move(LastMappingSymbol->second);
482 LastEMSInfo.reset(new ElfMappingSymbolInfo(SMLoc(), nullptr, 0));
485 /// This function is the one used to emit instruction data into the ELF
486 /// streamer. We override it to add the appropriate mapping symbol if
488 void EmitInstruction(const MCInst &Inst, const MCSubtargetInfo &STI,
491 EmitThumbMappingSymbol();
493 EmitARMMappingSymbol();
495 MCELFStreamer::EmitInstruction(Inst, STI);
498 void emitInst(uint32_t Inst, char Suffix) {
501 const bool LittleEndian = getContext().getAsmInfo()->isLittleEndian();
508 EmitARMMappingSymbol();
509 for (unsigned II = 0, IE = Size; II != IE; II++) {
510 const unsigned I = LittleEndian ? (Size - II - 1) : II;
511 Buffer[Size - II - 1] = uint8_t(Inst >> I * CHAR_BIT);
517 Size = (Suffix == 'n' ? 2 : 4);
520 EmitThumbMappingSymbol();
521 // Thumb wide instructions are emitted as a pair of 16-bit words of the
522 // appropriate endianness.
523 for (unsigned II = 0, IE = Size; II != IE; II = II + 2) {
524 const unsigned I0 = LittleEndian ? II + 0 : II + 1;
525 const unsigned I1 = LittleEndian ? II + 1 : II + 0;
526 Buffer[Size - II - 2] = uint8_t(Inst >> I0 * CHAR_BIT);
527 Buffer[Size - II - 1] = uint8_t(Inst >> I1 * CHAR_BIT);
532 llvm_unreachable("Invalid Suffix");
535 MCELFStreamer::EmitBytes(StringRef(Buffer, Size));
538 /// This is one of the functions used to emit data into an ELF section, so the
539 /// ARM streamer overrides it to add the appropriate mapping symbol ($d) if
541 void EmitBytes(StringRef Data) override {
542 EmitDataMappingSymbol();
543 MCELFStreamer::EmitBytes(Data);
546 void FlushPendingMappingSymbol() {
547 if (!LastEMSInfo->hasInfo())
549 ElfMappingSymbolInfo *EMS = LastEMSInfo.get();
550 EmitMappingSymbol("$d", EMS->Loc, EMS->F, EMS->Offset);
554 /// This is one of the functions used to emit data into an ELF section, so the
555 /// ARM streamer overrides it to add the appropriate mapping symbol ($d) if
557 void EmitValueImpl(const MCExpr *Value, unsigned Size, SMLoc Loc) override {
558 if (const MCSymbolRefExpr *SRE = dyn_cast_or_null<MCSymbolRefExpr>(Value)) {
559 if (SRE->getKind() == MCSymbolRefExpr::VK_ARM_SBREL && !(Size == 4)) {
560 getContext().reportError(Loc, "relocated expression must be 32-bit");
563 getOrCreateDataFragment();
566 EmitDataMappingSymbol();
567 MCELFStreamer::EmitValueImpl(Value, Size, Loc);
570 void EmitAssemblerFlag(MCAssemblerFlag Flag) override {
571 MCELFStreamer::EmitAssemblerFlag(Flag);
574 case MCAF_SyntaxUnified:
575 return; // no-op here.
578 return; // Change to Thumb mode
581 return; // Change to ARM mode
584 case MCAF_SubsectionsViaSymbols:
590 enum ElfMappingSymbol {
597 struct ElfMappingSymbolInfo {
598 explicit ElfMappingSymbolInfo(SMLoc Loc, MCFragment *F, uint64_t O)
599 : Loc(Loc), F(F), Offset(O), State(EMS_None) {}
604 bool hasInfo() { return F != nullptr; }
608 ElfMappingSymbol State;
611 void EmitDataMappingSymbol() {
612 if (LastEMSInfo->State == EMS_Data)
614 else if (LastEMSInfo->State == EMS_None) {
615 // This is a tentative symbol, it won't really be emitted until it's
617 ElfMappingSymbolInfo *EMS = LastEMSInfo.get();
618 auto *DF = dyn_cast_or_null<MCDataFragment>(getCurrentFragment());
622 EMS->F = getCurrentFragment();
623 EMS->Offset = DF->getContents().size();
624 LastEMSInfo->State = EMS_Data;
627 EmitMappingSymbol("$d");
628 LastEMSInfo->State = EMS_Data;
631 void EmitThumbMappingSymbol() {
632 if (LastEMSInfo->State == EMS_Thumb)
634 FlushPendingMappingSymbol();
635 EmitMappingSymbol("$t");
636 LastEMSInfo->State = EMS_Thumb;
639 void EmitARMMappingSymbol() {
640 if (LastEMSInfo->State == EMS_ARM)
642 FlushPendingMappingSymbol();
643 EmitMappingSymbol("$a");
644 LastEMSInfo->State = EMS_ARM;
647 void EmitMappingSymbol(StringRef Name) {
648 auto *Symbol = cast<MCSymbolELF>(getContext().getOrCreateSymbol(
649 Name + "." + Twine(MappingSymbolCounter++)));
652 Symbol->setType(ELF::STT_NOTYPE);
653 Symbol->setBinding(ELF::STB_LOCAL);
654 Symbol->setExternal(false);
657 void EmitMappingSymbol(StringRef Name, SMLoc Loc, MCFragment *F,
659 auto *Symbol = cast<MCSymbolELF>(getContext().getOrCreateSymbol(
660 Name + "." + Twine(MappingSymbolCounter++)));
661 EmitLabel(Symbol, Loc, F);
662 Symbol->setType(ELF::STT_NOTYPE);
663 Symbol->setBinding(ELF::STB_LOCAL);
664 Symbol->setExternal(false);
665 Symbol->setOffset(Offset);
668 void EmitThumbFunc(MCSymbol *Func) override {
669 getAssembler().setIsThumbFunc(Func);
670 EmitSymbolAttribute(Func, MCSA_ELF_TypeFunction);
673 // Helper functions for ARM exception handling directives
676 // Reset state between object emissions
677 void reset() override;
679 void EmitPersonalityFixup(StringRef Name);
680 void FlushPendingOffset();
681 void FlushUnwindOpcodes(bool NoHandlerData);
683 void SwitchToEHSection(StringRef Prefix, unsigned Type, unsigned Flags,
684 SectionKind Kind, const MCSymbol &Fn);
685 void SwitchToExTabSection(const MCSymbol &FnStart);
686 void SwitchToExIdxSection(const MCSymbol &FnStart);
688 void EmitFixup(const MCExpr *Expr, MCFixupKind Kind);
691 int64_t MappingSymbolCounter = 0;
693 DenseMap<const MCSection *, std::unique_ptr<ElfMappingSymbolInfo>>
696 std::unique_ptr<ElfMappingSymbolInfo> LastEMSInfo;
698 // ARM Exception Handling Frame Information
701 const MCSymbol *Personality;
702 unsigned PersonalityIndex;
703 unsigned FPReg; // Frame pointer register
704 int64_t FPOffset; // Offset: (final frame pointer) - (initial $sp)
705 int64_t SPOffset; // Offset: (final $sp) - (initial $sp)
706 int64_t PendingOffset; // Offset: (final $sp) - (emitted $sp)
709 SmallVector<uint8_t, 64> Opcodes;
710 UnwindOpcodeAssembler UnwindOpAsm;
713 } // end anonymous namespace
715 ARMELFStreamer &ARMTargetELFStreamer::getStreamer() {
716 return static_cast<ARMELFStreamer &>(Streamer);
719 void ARMTargetELFStreamer::emitFnStart() { getStreamer().emitFnStart(); }
720 void ARMTargetELFStreamer::emitFnEnd() { getStreamer().emitFnEnd(); }
721 void ARMTargetELFStreamer::emitCantUnwind() { getStreamer().emitCantUnwind(); }
723 void ARMTargetELFStreamer::emitPersonality(const MCSymbol *Personality) {
724 getStreamer().emitPersonality(Personality);
727 void ARMTargetELFStreamer::emitPersonalityIndex(unsigned Index) {
728 getStreamer().emitPersonalityIndex(Index);
731 void ARMTargetELFStreamer::emitHandlerData() {
732 getStreamer().emitHandlerData();
735 void ARMTargetELFStreamer::emitSetFP(unsigned FpReg, unsigned SpReg,
737 getStreamer().emitSetFP(FpReg, SpReg, Offset);
740 void ARMTargetELFStreamer::emitMovSP(unsigned Reg, int64_t Offset) {
741 getStreamer().emitMovSP(Reg, Offset);
744 void ARMTargetELFStreamer::emitPad(int64_t Offset) {
745 getStreamer().emitPad(Offset);
748 void ARMTargetELFStreamer::emitRegSave(const SmallVectorImpl<unsigned> &RegList,
750 getStreamer().emitRegSave(RegList, isVector);
753 void ARMTargetELFStreamer::emitUnwindRaw(int64_t Offset,
754 const SmallVectorImpl<uint8_t> &Opcodes) {
755 getStreamer().emitUnwindRaw(Offset, Opcodes);
758 void ARMTargetELFStreamer::switchVendor(StringRef Vendor) {
759 assert(!Vendor.empty() && "Vendor cannot be empty.");
761 if (CurrentVendor == Vendor)
764 if (!CurrentVendor.empty())
765 finishAttributeSection();
767 assert(Contents.empty() &&
768 ".ARM.attributes should be flushed before changing vendor");
769 CurrentVendor = Vendor;
773 void ARMTargetELFStreamer::emitAttribute(unsigned Attribute, unsigned Value) {
774 setAttributeItem(Attribute, Value, /* OverwriteExisting= */ true);
777 void ARMTargetELFStreamer::emitTextAttribute(unsigned Attribute,
779 setAttributeItem(Attribute, Value, /* OverwriteExisting= */ true);
782 void ARMTargetELFStreamer::emitIntTextAttribute(unsigned Attribute,
784 StringRef StringValue) {
785 setAttributeItems(Attribute, IntValue, StringValue,
786 /* OverwriteExisting= */ true);
789 void ARMTargetELFStreamer::emitArch(ARM::ArchKind Value) {
793 void ARMTargetELFStreamer::emitObjectArch(ARM::ArchKind Value) {
797 void ARMTargetELFStreamer::emitArchDefaultAttributes() {
798 using namespace ARMBuildAttrs;
800 setAttributeItem(CPU_name,
801 ARM::getCPUAttr(Arch),
804 if (EmittedArch == ARM::ArchKind::INVALID)
805 setAttributeItem(CPU_arch,
806 ARM::getArchAttr(Arch),
809 setAttributeItem(CPU_arch,
810 ARM::getArchAttr(EmittedArch),
814 case ARM::ArchKind::ARMV2:
815 case ARM::ArchKind::ARMV2A:
816 case ARM::ArchKind::ARMV3:
817 case ARM::ArchKind::ARMV3M:
818 case ARM::ArchKind::ARMV4:
819 setAttributeItem(ARM_ISA_use, Allowed, false);
822 case ARM::ArchKind::ARMV4T:
823 case ARM::ArchKind::ARMV5T:
824 case ARM::ArchKind::ARMV5TE:
825 case ARM::ArchKind::ARMV6:
826 setAttributeItem(ARM_ISA_use, Allowed, false);
827 setAttributeItem(THUMB_ISA_use, Allowed, false);
830 case ARM::ArchKind::ARMV6T2:
831 setAttributeItem(ARM_ISA_use, Allowed, false);
832 setAttributeItem(THUMB_ISA_use, AllowThumb32, false);
835 case ARM::ArchKind::ARMV6K:
836 case ARM::ArchKind::ARMV6KZ:
837 setAttributeItem(ARM_ISA_use, Allowed, false);
838 setAttributeItem(THUMB_ISA_use, Allowed, false);
839 setAttributeItem(Virtualization_use, AllowTZ, false);
842 case ARM::ArchKind::ARMV6M:
843 setAttributeItem(THUMB_ISA_use, Allowed, false);
846 case ARM::ArchKind::ARMV7A:
847 setAttributeItem(CPU_arch_profile, ApplicationProfile, false);
848 setAttributeItem(ARM_ISA_use, Allowed, false);
849 setAttributeItem(THUMB_ISA_use, AllowThumb32, false);
852 case ARM::ArchKind::ARMV7R:
853 setAttributeItem(CPU_arch_profile, RealTimeProfile, false);
854 setAttributeItem(ARM_ISA_use, Allowed, false);
855 setAttributeItem(THUMB_ISA_use, AllowThumb32, false);
858 case ARM::ArchKind::ARMV7EM:
859 case ARM::ArchKind::ARMV7M:
860 setAttributeItem(CPU_arch_profile, MicroControllerProfile, false);
861 setAttributeItem(THUMB_ISA_use, AllowThumb32, false);
864 case ARM::ArchKind::ARMV8A:
865 case ARM::ArchKind::ARMV8_1A:
866 case ARM::ArchKind::ARMV8_2A:
867 case ARM::ArchKind::ARMV8_3A:
868 case ARM::ArchKind::ARMV8_4A:
869 case ARM::ArchKind::ARMV8_5A:
870 setAttributeItem(CPU_arch_profile, ApplicationProfile, false);
871 setAttributeItem(ARM_ISA_use, Allowed, false);
872 setAttributeItem(THUMB_ISA_use, AllowThumb32, false);
873 setAttributeItem(MPextension_use, Allowed, false);
874 setAttributeItem(Virtualization_use, AllowTZVirtualization, false);
877 case ARM::ArchKind::ARMV8MBaseline:
878 case ARM::ArchKind::ARMV8MMainline:
879 setAttributeItem(THUMB_ISA_use, AllowThumbDerived, false);
880 setAttributeItem(CPU_arch_profile, MicroControllerProfile, false);
883 case ARM::ArchKind::IWMMXT:
884 setAttributeItem(ARM_ISA_use, Allowed, false);
885 setAttributeItem(THUMB_ISA_use, Allowed, false);
886 setAttributeItem(WMMX_arch, AllowWMMXv1, false);
889 case ARM::ArchKind::IWMMXT2:
890 setAttributeItem(ARM_ISA_use, Allowed, false);
891 setAttributeItem(THUMB_ISA_use, Allowed, false);
892 setAttributeItem(WMMX_arch, AllowWMMXv2, false);
896 report_fatal_error("Unknown Arch: " + Twine(ARM::getArchName(Arch)));
901 void ARMTargetELFStreamer::emitFPU(unsigned Value) {
905 void ARMTargetELFStreamer::emitFPUDefaultAttributes() {
909 setAttributeItem(ARMBuildAttrs::FP_arch,
910 ARMBuildAttrs::AllowFPv2,
911 /* OverwriteExisting= */ false);
915 setAttributeItem(ARMBuildAttrs::FP_arch,
916 ARMBuildAttrs::AllowFPv3A,
917 /* OverwriteExisting= */ false);
920 case ARM::FK_VFPV3_FP16:
921 setAttributeItem(ARMBuildAttrs::FP_arch,
922 ARMBuildAttrs::AllowFPv3A,
923 /* OverwriteExisting= */ false);
924 setAttributeItem(ARMBuildAttrs::FP_HP_extension,
925 ARMBuildAttrs::AllowHPFP,
926 /* OverwriteExisting= */ false);
929 case ARM::FK_VFPV3_D16:
930 setAttributeItem(ARMBuildAttrs::FP_arch,
931 ARMBuildAttrs::AllowFPv3B,
932 /* OverwriteExisting= */ false);
935 case ARM::FK_VFPV3_D16_FP16:
936 setAttributeItem(ARMBuildAttrs::FP_arch,
937 ARMBuildAttrs::AllowFPv3B,
938 /* OverwriteExisting= */ false);
939 setAttributeItem(ARMBuildAttrs::FP_HP_extension,
940 ARMBuildAttrs::AllowHPFP,
941 /* OverwriteExisting= */ false);
944 case ARM::FK_VFPV3XD:
945 setAttributeItem(ARMBuildAttrs::FP_arch,
946 ARMBuildAttrs::AllowFPv3B,
947 /* OverwriteExisting= */ false);
949 case ARM::FK_VFPV3XD_FP16:
950 setAttributeItem(ARMBuildAttrs::FP_arch,
951 ARMBuildAttrs::AllowFPv3B,
952 /* OverwriteExisting= */ false);
953 setAttributeItem(ARMBuildAttrs::FP_HP_extension,
954 ARMBuildAttrs::AllowHPFP,
955 /* OverwriteExisting= */ false);
959 setAttributeItem(ARMBuildAttrs::FP_arch,
960 ARMBuildAttrs::AllowFPv4A,
961 /* OverwriteExisting= */ false);
964 // ABI_HardFP_use is handled in ARMAsmPrinter, so _SP_D16 is treated the same
966 case ARM::FK_FPV4_SP_D16:
967 case ARM::FK_VFPV4_D16:
968 setAttributeItem(ARMBuildAttrs::FP_arch,
969 ARMBuildAttrs::AllowFPv4B,
970 /* OverwriteExisting= */ false);
973 case ARM::FK_FP_ARMV8:
974 setAttributeItem(ARMBuildAttrs::FP_arch,
975 ARMBuildAttrs::AllowFPARMv8A,
976 /* OverwriteExisting= */ false);
979 // FPV5_D16 is identical to FP_ARMV8 except for the number of D registers, so
980 // uses the FP_ARMV8_D16 build attribute.
981 case ARM::FK_FPV5_SP_D16:
982 case ARM::FK_FPV5_D16:
983 setAttributeItem(ARMBuildAttrs::FP_arch,
984 ARMBuildAttrs::AllowFPARMv8B,
985 /* OverwriteExisting= */ false);
989 setAttributeItem(ARMBuildAttrs::FP_arch,
990 ARMBuildAttrs::AllowFPv3A,
991 /* OverwriteExisting= */ false);
992 setAttributeItem(ARMBuildAttrs::Advanced_SIMD_arch,
993 ARMBuildAttrs::AllowNeon,
994 /* OverwriteExisting= */ false);
997 case ARM::FK_NEON_FP16:
998 setAttributeItem(ARMBuildAttrs::FP_arch,
999 ARMBuildAttrs::AllowFPv3A,
1000 /* OverwriteExisting= */ false);
1001 setAttributeItem(ARMBuildAttrs::Advanced_SIMD_arch,
1002 ARMBuildAttrs::AllowNeon,
1003 /* OverwriteExisting= */ false);
1004 setAttributeItem(ARMBuildAttrs::FP_HP_extension,
1005 ARMBuildAttrs::AllowHPFP,
1006 /* OverwriteExisting= */ false);
1009 case ARM::FK_NEON_VFPV4:
1010 setAttributeItem(ARMBuildAttrs::FP_arch,
1011 ARMBuildAttrs::AllowFPv4A,
1012 /* OverwriteExisting= */ false);
1013 setAttributeItem(ARMBuildAttrs::Advanced_SIMD_arch,
1014 ARMBuildAttrs::AllowNeon2,
1015 /* OverwriteExisting= */ false);
1018 case ARM::FK_NEON_FP_ARMV8:
1019 case ARM::FK_CRYPTO_NEON_FP_ARMV8:
1020 setAttributeItem(ARMBuildAttrs::FP_arch,
1021 ARMBuildAttrs::AllowFPARMv8A,
1022 /* OverwriteExisting= */ false);
1023 // 'Advanced_SIMD_arch' must be emitted not here, but within
1024 // ARMAsmPrinter::emitAttributes(), depending on hasV8Ops() and hasV8_1a()
1027 case ARM::FK_SOFTVFP:
1032 report_fatal_error("Unknown FPU: " + Twine(FPU));
1037 size_t ARMTargetELFStreamer::calculateContentSize() const {
1039 for (size_t i = 0; i < Contents.size(); ++i) {
1040 AttributeItem item = Contents[i];
1041 switch (item.Type) {
1042 case AttributeItem::HiddenAttribute:
1044 case AttributeItem::NumericAttribute:
1045 Result += getULEB128Size(item.Tag);
1046 Result += getULEB128Size(item.IntValue);
1048 case AttributeItem::TextAttribute:
1049 Result += getULEB128Size(item.Tag);
1050 Result += item.StringValue.size() + 1; // string + '\0'
1052 case AttributeItem::NumericAndTextAttributes:
1053 Result += getULEB128Size(item.Tag);
1054 Result += getULEB128Size(item.IntValue);
1055 Result += item.StringValue.size() + 1; // string + '\0';
1062 void ARMTargetELFStreamer::finishAttributeSection() {
1064 // [ <section-length> "vendor-name"
1065 // [ <file-tag> <size> <attribute>*
1066 // | <section-tag> <size> <section-number>* 0 <attribute>*
1067 // | <symbol-tag> <size> <symbol-number>* 0 <attribute>*
1071 if (FPU != ARM::FK_INVALID)
1072 emitFPUDefaultAttributes();
1074 if (Arch != ARM::ArchKind::INVALID)
1075 emitArchDefaultAttributes();
1077 if (Contents.empty())
1080 llvm::sort(Contents, AttributeItem::LessTag);
1082 ARMELFStreamer &Streamer = getStreamer();
1084 // Switch to .ARM.attributes section
1085 if (AttributeSection) {
1086 Streamer.SwitchSection(AttributeSection);
1088 AttributeSection = Streamer.getContext().getELFSection(
1089 ".ARM.attributes", ELF::SHT_ARM_ATTRIBUTES, 0);
1090 Streamer.SwitchSection(AttributeSection);
1093 Streamer.EmitIntValue(0x41, 1);
1096 // Vendor size + Vendor name + '\0'
1097 const size_t VendorHeaderSize = 4 + CurrentVendor.size() + 1;
1100 const size_t TagHeaderSize = 1 + 4;
1102 const size_t ContentsSize = calculateContentSize();
1104 Streamer.EmitIntValue(VendorHeaderSize + TagHeaderSize + ContentsSize, 4);
1105 Streamer.EmitBytes(CurrentVendor);
1106 Streamer.EmitIntValue(0, 1); // '\0'
1108 Streamer.EmitIntValue(ARMBuildAttrs::File, 1);
1109 Streamer.EmitIntValue(TagHeaderSize + ContentsSize, 4);
1111 // Size should have been accounted for already, now
1112 // emit each field as its type (ULEB or String)
1113 for (size_t i = 0; i < Contents.size(); ++i) {
1114 AttributeItem item = Contents[i];
1115 Streamer.EmitULEB128IntValue(item.Tag);
1116 switch (item.Type) {
1117 default: llvm_unreachable("Invalid attribute type");
1118 case AttributeItem::NumericAttribute:
1119 Streamer.EmitULEB128IntValue(item.IntValue);
1121 case AttributeItem::TextAttribute:
1122 Streamer.EmitBytes(item.StringValue);
1123 Streamer.EmitIntValue(0, 1); // '\0'
1125 case AttributeItem::NumericAndTextAttributes:
1126 Streamer.EmitULEB128IntValue(item.IntValue);
1127 Streamer.EmitBytes(item.StringValue);
1128 Streamer.EmitIntValue(0, 1); // '\0'
1134 FPU = ARM::FK_INVALID;
1137 void ARMTargetELFStreamer::emitLabel(MCSymbol *Symbol) {
1138 ARMELFStreamer &Streamer = getStreamer();
1139 if (!Streamer.IsThumb)
1142 Streamer.getAssembler().registerSymbol(*Symbol);
1143 unsigned Type = cast<MCSymbolELF>(Symbol)->getType();
1144 if (Type == ELF::STT_FUNC || Type == ELF::STT_GNU_IFUNC)
1145 Streamer.EmitThumbFunc(Symbol);
1149 ARMTargetELFStreamer::AnnotateTLSDescriptorSequence(const MCSymbolRefExpr *S) {
1150 getStreamer().EmitFixup(S, FK_Data_4);
1153 void ARMTargetELFStreamer::emitThumbSet(MCSymbol *Symbol, const MCExpr *Value) {
1154 if (const MCSymbolRefExpr *SRE = dyn_cast<MCSymbolRefExpr>(Value)) {
1155 const MCSymbol &Sym = SRE->getSymbol();
1156 if (!Sym.isDefined()) {
1157 getStreamer().EmitAssignment(Symbol, Value);
1162 getStreamer().EmitThumbFunc(Symbol);
1163 getStreamer().EmitAssignment(Symbol, Value);
1166 void ARMTargetELFStreamer::emitInst(uint32_t Inst, char Suffix) {
1167 getStreamer().emitInst(Inst, Suffix);
1170 void ARMTargetELFStreamer::reset() { AttributeSection = nullptr; }
1172 void ARMELFStreamer::FinishImpl() {
1173 MCTargetStreamer &TS = *getTargetStreamer();
1174 ARMTargetStreamer &ATS = static_cast<ARMTargetStreamer &>(TS);
1175 ATS.finishAttributeSection();
1177 MCELFStreamer::FinishImpl();
1180 void ARMELFStreamer::reset() {
1181 MCTargetStreamer &TS = *getTargetStreamer();
1182 ARMTargetStreamer &ATS = static_cast<ARMTargetStreamer &>(TS);
1184 MappingSymbolCounter = 0;
1185 MCELFStreamer::reset();
1186 LastMappingSymbols.clear();
1187 LastEMSInfo.reset();
1188 // MCELFStreamer clear's the assembler's e_flags. However, for
1189 // arm we manually set the ABI version on streamer creation, so
1191 getAssembler().setELFHeaderEFlags(ELF::EF_ARM_EABI_VER5);
1194 inline void ARMELFStreamer::SwitchToEHSection(StringRef Prefix,
1198 const MCSymbol &Fn) {
1199 const MCSectionELF &FnSection =
1200 static_cast<const MCSectionELF &>(Fn.getSection());
1202 // Create the name for new section
1203 StringRef FnSecName(FnSection.getSectionName());
1204 SmallString<128> EHSecName(Prefix);
1205 if (FnSecName != ".text") {
1206 EHSecName += FnSecName;
1209 // Get .ARM.extab or .ARM.exidx section
1210 const MCSymbolELF *Group = FnSection.getGroup();
1212 Flags |= ELF::SHF_GROUP;
1213 MCSectionELF *EHSection = getContext().getELFSection(
1214 EHSecName, Type, Flags, 0, Group, FnSection.getUniqueID(),
1215 static_cast<const MCSymbolELF *>(&Fn));
1217 assert(EHSection && "Failed to get the required EH section");
1219 // Switch to .ARM.extab or .ARM.exidx section
1220 SwitchSection(EHSection);
1221 EmitCodeAlignment(4);
1224 inline void ARMELFStreamer::SwitchToExTabSection(const MCSymbol &FnStart) {
1225 SwitchToEHSection(".ARM.extab", ELF::SHT_PROGBITS, ELF::SHF_ALLOC,
1226 SectionKind::getData(), FnStart);
1229 inline void ARMELFStreamer::SwitchToExIdxSection(const MCSymbol &FnStart) {
1230 SwitchToEHSection(".ARM.exidx", ELF::SHT_ARM_EXIDX,
1231 ELF::SHF_ALLOC | ELF::SHF_LINK_ORDER,
1232 SectionKind::getData(), FnStart);
1235 void ARMELFStreamer::EmitFixup(const MCExpr *Expr, MCFixupKind Kind) {
1236 MCDataFragment *Frag = getOrCreateDataFragment();
1237 Frag->getFixups().push_back(MCFixup::create(Frag->getContents().size(), Expr,
1241 void ARMELFStreamer::EHReset() {
1244 Personality = nullptr;
1245 PersonalityIndex = ARM::EHABI::NUM_PERSONALITY_INDEX;
1254 UnwindOpAsm.Reset();
1257 void ARMELFStreamer::emitFnStart() {
1258 assert(FnStart == nullptr);
1259 FnStart = getContext().createTempSymbol();
1263 void ARMELFStreamer::emitFnEnd() {
1264 assert(FnStart && ".fnstart must precedes .fnend");
1266 // Emit unwind opcodes if there is no .handlerdata directive
1267 if (!ExTab && !CantUnwind)
1268 FlushUnwindOpcodes(true);
1270 // Emit the exception index table entry
1271 SwitchToExIdxSection(*FnStart);
1273 if (PersonalityIndex < ARM::EHABI::NUM_PERSONALITY_INDEX)
1274 EmitPersonalityFixup(GetAEABIUnwindPersonalityName(PersonalityIndex));
1276 const MCSymbolRefExpr *FnStartRef =
1277 MCSymbolRefExpr::create(FnStart,
1278 MCSymbolRefExpr::VK_ARM_PREL31,
1281 EmitValue(FnStartRef, 4);
1284 EmitIntValue(ARM::EHABI::EXIDX_CANTUNWIND, 4);
1286 // Emit a reference to the unwind opcodes in the ".ARM.extab" section.
1287 const MCSymbolRefExpr *ExTabEntryRef =
1288 MCSymbolRefExpr::create(ExTab,
1289 MCSymbolRefExpr::VK_ARM_PREL31,
1291 EmitValue(ExTabEntryRef, 4);
1293 // For the __aeabi_unwind_cpp_pr0, we have to emit the unwind opcodes in
1294 // the second word of exception index table entry. The size of the unwind
1295 // opcodes should always be 4 bytes.
1296 assert(PersonalityIndex == ARM::EHABI::AEABI_UNWIND_CPP_PR0 &&
1297 "Compact model must use __aeabi_unwind_cpp_pr0 as personality");
1298 assert(Opcodes.size() == 4u &&
1299 "Unwind opcode size for __aeabi_unwind_cpp_pr0 must be equal to 4");
1300 uint64_t Intval = Opcodes[0] |
1304 EmitIntValue(Intval, Opcodes.size());
1307 // Switch to the section containing FnStart
1308 SwitchSection(&FnStart->getSection());
1310 // Clean exception handling frame information
1314 void ARMELFStreamer::emitCantUnwind() { CantUnwind = true; }
1316 // Add the R_ARM_NONE fixup at the same position
1317 void ARMELFStreamer::EmitPersonalityFixup(StringRef Name) {
1318 const MCSymbol *PersonalitySym = getContext().getOrCreateSymbol(Name);
1320 const MCSymbolRefExpr *PersonalityRef = MCSymbolRefExpr::create(
1321 PersonalitySym, MCSymbolRefExpr::VK_ARM_NONE, getContext());
1323 visitUsedExpr(*PersonalityRef);
1324 MCDataFragment *DF = getOrCreateDataFragment();
1325 DF->getFixups().push_back(MCFixup::create(DF->getContents().size(),
1327 MCFixup::getKindForSize(4, false)));
1330 void ARMELFStreamer::FlushPendingOffset() {
1331 if (PendingOffset != 0) {
1332 UnwindOpAsm.EmitSPOffset(-PendingOffset);
1337 void ARMELFStreamer::FlushUnwindOpcodes(bool NoHandlerData) {
1338 // Emit the unwind opcode to restore $sp.
1340 const MCRegisterInfo *MRI = getContext().getRegisterInfo();
1341 int64_t LastRegSaveSPOffset = SPOffset - PendingOffset;
1342 UnwindOpAsm.EmitSPOffset(LastRegSaveSPOffset - FPOffset);
1343 UnwindOpAsm.EmitSetSP(MRI->getEncodingValue(FPReg));
1345 FlushPendingOffset();
1348 // Finalize the unwind opcode sequence
1349 UnwindOpAsm.Finalize(PersonalityIndex, Opcodes);
1351 // For compact model 0, we have to emit the unwind opcodes in the .ARM.exidx
1352 // section. Thus, we don't have to create an entry in the .ARM.extab
1354 if (NoHandlerData && PersonalityIndex == ARM::EHABI::AEABI_UNWIND_CPP_PR0)
1357 // Switch to .ARM.extab section.
1358 SwitchToExTabSection(*FnStart);
1360 // Create .ARM.extab label for offset in .ARM.exidx
1362 ExTab = getContext().createTempSymbol();
1367 const MCSymbolRefExpr *PersonalityRef =
1368 MCSymbolRefExpr::create(Personality,
1369 MCSymbolRefExpr::VK_ARM_PREL31,
1372 EmitValue(PersonalityRef, 4);
1375 // Emit unwind opcodes
1376 assert((Opcodes.size() % 4) == 0 &&
1377 "Unwind opcode size for __aeabi_cpp_unwind_pr0 must be multiple of 4");
1378 for (unsigned I = 0; I != Opcodes.size(); I += 4) {
1379 uint64_t Intval = Opcodes[I] |
1380 Opcodes[I + 1] << 8 |
1381 Opcodes[I + 2] << 16 |
1382 Opcodes[I + 3] << 24;
1383 EmitIntValue(Intval, 4);
1386 // According to ARM EHABI section 9.2, if the __aeabi_unwind_cpp_pr1() or
1387 // __aeabi_unwind_cpp_pr2() is used, then the handler data must be emitted
1388 // after the unwind opcodes. The handler data consists of several 32-bit
1389 // words, and should be terminated by zero.
1391 // In case that the .handlerdata directive is not specified by the
1392 // programmer, we should emit zero to terminate the handler data.
1393 if (NoHandlerData && !Personality)
1397 void ARMELFStreamer::emitHandlerData() { FlushUnwindOpcodes(false); }
1399 void ARMELFStreamer::emitPersonality(const MCSymbol *Per) {
1401 UnwindOpAsm.setPersonality(Per);
1404 void ARMELFStreamer::emitPersonalityIndex(unsigned Index) {
1405 assert(Index < ARM::EHABI::NUM_PERSONALITY_INDEX && "invalid index");
1406 PersonalityIndex = Index;
1409 void ARMELFStreamer::emitSetFP(unsigned NewFPReg, unsigned NewSPReg,
1411 assert((NewSPReg == ARM::SP || NewSPReg == FPReg) &&
1412 "the operand of .setfp directive should be either $sp or $fp");
1417 if (NewSPReg == ARM::SP)
1418 FPOffset = SPOffset + Offset;
1423 void ARMELFStreamer::emitMovSP(unsigned Reg, int64_t Offset) {
1424 assert((Reg != ARM::SP && Reg != ARM::PC) &&
1425 "the operand of .movsp cannot be either sp or pc");
1426 assert(FPReg == ARM::SP && "current FP must be SP");
1428 FlushPendingOffset();
1431 FPOffset = SPOffset + Offset;
1433 const MCRegisterInfo *MRI = getContext().getRegisterInfo();
1434 UnwindOpAsm.EmitSetSP(MRI->getEncodingValue(FPReg));
1437 void ARMELFStreamer::emitPad(int64_t Offset) {
1438 // Track the change of the $sp offset
1441 // To squash multiple .pad directives, we should delay the unwind opcode
1442 // until the .save, .vsave, .handlerdata, or .fnend directives.
1443 PendingOffset -= Offset;
1446 void ARMELFStreamer::emitRegSave(const SmallVectorImpl<unsigned> &RegList,
1448 // Collect the registers in the register list
1451 const MCRegisterInfo *MRI = getContext().getRegisterInfo();
1452 for (size_t i = 0; i < RegList.size(); ++i) {
1453 unsigned Reg = MRI->getEncodingValue(RegList[i]);
1454 assert(Reg < (IsVector ? 32U : 16U) && "Register out of range");
1455 unsigned Bit = (1u << Reg);
1456 if ((Mask & Bit) == 0) {
1462 // Track the change the $sp offset: For the .save directive, the
1463 // corresponding push instruction will decrease the $sp by (4 * Count).
1464 // For the .vsave directive, the corresponding vpush instruction will
1465 // decrease $sp by (8 * Count).
1466 SPOffset -= Count * (IsVector ? 8 : 4);
1469 FlushPendingOffset();
1471 UnwindOpAsm.EmitVFPRegSave(Mask);
1473 UnwindOpAsm.EmitRegSave(Mask);
1476 void ARMELFStreamer::emitUnwindRaw(int64_t Offset,
1477 const SmallVectorImpl<uint8_t> &Opcodes) {
1478 FlushPendingOffset();
1479 SPOffset = SPOffset - Offset;
1480 UnwindOpAsm.EmitRaw(Opcodes);
1485 MCTargetStreamer *createARMTargetAsmStreamer(MCStreamer &S,
1486 formatted_raw_ostream &OS,
1487 MCInstPrinter *InstPrint,
1488 bool isVerboseAsm) {
1489 return new ARMTargetAsmStreamer(S, OS, *InstPrint, isVerboseAsm);
1492 MCTargetStreamer *createARMNullTargetStreamer(MCStreamer &S) {
1493 return new ARMTargetStreamer(S);
1496 MCTargetStreamer *createARMObjectTargetStreamer(MCStreamer &S,
1497 const MCSubtargetInfo &STI) {
1498 const Triple &TT = STI.getTargetTriple();
1499 if (TT.isOSBinFormatELF())
1500 return new ARMTargetELFStreamer(S);
1501 return new ARMTargetStreamer(S);
1504 MCELFStreamer *createARMELFStreamer(MCContext &Context,
1505 std::unique_ptr<MCAsmBackend> TAB,
1506 std::unique_ptr<MCObjectWriter> OW,
1507 std::unique_ptr<MCCodeEmitter> Emitter,
1508 bool RelaxAll, bool IsThumb) {
1509 ARMELFStreamer *S = new ARMELFStreamer(Context, std::move(TAB), std::move(OW),
1510 std::move(Emitter), IsThumb);
1511 // FIXME: This should eventually end up somewhere else where more
1512 // intelligent flag decisions can be made. For now we are just maintaining
1513 // the status quo for ARM and setting EF_ARM_EABI_VER5 as the default.
1514 S->getAssembler().setELFHeaderEFlags(ELF::EF_ARM_EABI_VER5);
1517 S->getAssembler().setRelaxAll(true);
1521 } // end namespace llvm