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https://github.com/c64scene-ar/llvm-6502.git
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Override virtual function for ARM EH directives.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@173939 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Logan Chien
parent
f121b79a6a
commit
52b1b3bbc6
@ -13,6 +13,7 @@
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//
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//===----------------------------------------------------------------------===//
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#include "ARMUnwindOp.h"
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#include "llvm/ADT/SmallPtrSet.h"
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#include "llvm/ADT/Twine.h"
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#include "llvm/MC/MCAsmBackend.h"
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@ -56,11 +57,25 @@ public:
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ARMELFStreamer(MCContext &Context, MCAsmBackend &TAB,
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raw_ostream &OS, MCCodeEmitter *Emitter, bool IsThumb)
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: MCELFStreamer(Context, TAB, OS, Emitter),
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IsThumb(IsThumb), MappingSymbolCounter(0), LastEMS(EMS_None) {
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IsThumb(IsThumb), MappingSymbolCounter(0), LastEMS(EMS_None),
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ExTab(0), FnStart(0), Personality(0), CantUnwind(false) {
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}
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~ARMELFStreamer() {}
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// ARM exception handling directives
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virtual void EmitFnStart();
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virtual void EmitFnEnd();
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virtual void EmitCantUnwind();
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virtual void EmitPersonality(const MCSymbol *Per);
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virtual void EmitHandlerData();
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virtual void EmitSetFP(unsigned NewFpReg,
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unsigned NewSpReg,
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int64_t Offset = 0);
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virtual void EmitPad(int64_t Offset);
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virtual void EmitRegSave(const SmallVectorImpl<unsigned> &RegList,
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bool isVector);
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virtual void ChangeSection(const MCSection *Section) {
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// We have to keep track of the mapping symbol state of any sections we
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// use. Each one should start off as EMS_None, which is provided as the
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@ -172,6 +187,15 @@ private:
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SD.setFlags(SD.getFlags() | ELF_Other_ThumbFunc);
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}
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// Helper functions for ARM exception handling directives
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void Reset();
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void EmitPersonalityFixup(StringRef Name);
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void SwitchToEHSection(const char *Prefix, unsigned Type, unsigned Flags,
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SectionKind Kind, const MCSymbol &Fn);
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void SwitchToExTabSection(const MCSymbol &FnStart);
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void SwitchToExIdxSection(const MCSymbol &FnStart);
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bool IsThumb;
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int64_t MappingSymbolCounter;
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@ -179,10 +203,200 @@ private:
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DenseMap<const MCSection *, ElfMappingSymbol> LastMappingSymbols;
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ElfMappingSymbol LastEMS;
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/// @}
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// ARM Exception Handling Frame Information
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MCSymbol *ExTab;
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MCSymbol *FnStart;
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const MCSymbol *Personality;
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bool CantUnwind;
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};
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}
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inline void ARMELFStreamer::SwitchToEHSection(const char *Prefix,
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unsigned Type,
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unsigned Flags,
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SectionKind Kind,
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const MCSymbol &Fn) {
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const MCSectionELF &FnSection =
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static_cast<const MCSectionELF &>(Fn.getSection());
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// Create the name for new section
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StringRef FnSecName(FnSection.getSectionName());
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SmallString<128> EHSecName(Prefix);
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if (FnSecName != ".text") {
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EHSecName += FnSecName;
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}
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// Get .ARM.extab or .ARM.exidx section
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const MCSectionELF *EHSection = NULL;
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if (const MCSymbol *Group = FnSection.getGroup()) {
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EHSection = getContext().getELFSection(
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EHSecName, Type, Flags | ELF::SHF_GROUP, Kind,
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FnSection.getEntrySize(), Group->getName());
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} else {
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EHSection = getContext().getELFSection(EHSecName, Type, Flags, Kind);
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}
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assert(EHSection);
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// Switch to .ARM.extab or .ARM.exidx section
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SwitchSection(EHSection);
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EmitCodeAlignment(4, 0);
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}
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inline void ARMELFStreamer::SwitchToExTabSection(const MCSymbol &FnStart) {
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SwitchToEHSection(".ARM.extab",
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ELF::SHT_PROGBITS,
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ELF::SHF_ALLOC,
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SectionKind::getDataRel(),
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FnStart);
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}
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inline void ARMELFStreamer::SwitchToExIdxSection(const MCSymbol &FnStart) {
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SwitchToEHSection(".ARM.exidx",
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ELF::SHT_ARM_EXIDX,
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ELF::SHF_ALLOC | ELF::SHF_LINK_ORDER,
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SectionKind::getDataRel(),
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FnStart);
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}
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void ARMELFStreamer::Reset() {
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ExTab = NULL;
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FnStart = NULL;
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Personality = NULL;
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CantUnwind = false;
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}
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// Add the R_ARM_NONE fixup at the same position
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void ARMELFStreamer::EmitPersonalityFixup(StringRef Name) {
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const MCSymbol *PersonalitySym = getContext().GetOrCreateSymbol(Name);
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const MCSymbolRefExpr *PersonalityRef =
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MCSymbolRefExpr::Create(PersonalitySym,
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MCSymbolRefExpr::VK_ARM_NONE,
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getContext());
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AddValueSymbols(PersonalityRef);
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MCDataFragment *DF = getOrCreateDataFragment();
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DF->getFixups().push_back(
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MCFixup::Create(DF->getContents().size(), PersonalityRef,
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MCFixup::getKindForSize(4, false)));
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}
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void ARMELFStreamer::EmitFnStart() {
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assert(FnStart == 0);
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FnStart = getContext().CreateTempSymbol();
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EmitLabel(FnStart);
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}
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void ARMELFStreamer::EmitFnEnd() {
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assert(FnStart && ".fnstart must preceeds .fnend");
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// Emit unwind opcodes if there is no .handlerdata directive
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int PersonalityIndex = -1;
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if (!ExTab && !CantUnwind) {
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// For __aeabi_unwind_cpp_pr1, we have to emit opcodes in .ARM.extab.
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SwitchToExTabSection(*FnStart);
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// Create .ARM.extab label for offset in .ARM.exidx
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ExTab = getContext().CreateTempSymbol();
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EmitLabel(ExTab);
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PersonalityIndex = 1;
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uint32_t Entry = 0;
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uint32_t NumExtraEntryWords = 0;
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Entry |= NumExtraEntryWords << 24;
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Entry |= (EHT_COMPACT | PersonalityIndex) << 16;
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// TODO: This should be generated according to .save, .vsave, .setfp
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// directives. Currently, we are simply generating FINISH opcode.
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Entry |= UNWIND_OPCODE_FINISH << 8;
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Entry |= UNWIND_OPCODE_FINISH;
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EmitIntValue(Entry, 4, 0);
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}
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// Emit the exception index table entry
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SwitchToExIdxSection(*FnStart);
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if (PersonalityIndex == 1)
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EmitPersonalityFixup("__aeabi_unwind_cpp_pr1");
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const MCSymbolRefExpr *FnStartRef =
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MCSymbolRefExpr::Create(FnStart,
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MCSymbolRefExpr::VK_ARM_PREL31,
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getContext());
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EmitValue(FnStartRef, 4, 0);
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if (CantUnwind) {
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EmitIntValue(EXIDX_CANTUNWIND, 4, 0);
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} else {
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const MCSymbolRefExpr *ExTabEntryRef =
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MCSymbolRefExpr::Create(ExTab,
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MCSymbolRefExpr::VK_ARM_PREL31,
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getContext());
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EmitValue(ExTabEntryRef, 4, 0);
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}
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// Clean exception handling frame information
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Reset();
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}
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void ARMELFStreamer::EmitCantUnwind() {
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CantUnwind = true;
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}
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void ARMELFStreamer::EmitHandlerData() {
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SwitchToExTabSection(*FnStart);
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// Create .ARM.extab label for offset in .ARM.exidx
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assert(!ExTab);
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ExTab = getContext().CreateTempSymbol();
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EmitLabel(ExTab);
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// Emit Personality
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assert(Personality && ".personality directive must preceed .handlerdata");
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const MCSymbolRefExpr *PersonalityRef =
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MCSymbolRefExpr::Create(Personality,
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MCSymbolRefExpr::VK_ARM_PREL31,
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getContext());
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EmitValue(PersonalityRef, 4, 0);
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// Emit unwind opcodes
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uint32_t Entry = 0;
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uint32_t NumExtraEntryWords = 0;
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// TODO: This should be generated according to .save, .vsave, .setfp
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// directives. Currently, we are simply generating FINISH opcode.
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Entry |= NumExtraEntryWords << 24;
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Entry |= UNWIND_OPCODE_FINISH << 16;
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Entry |= UNWIND_OPCODE_FINISH << 8;
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Entry |= UNWIND_OPCODE_FINISH;
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EmitIntValue(Entry, 4, 0);
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}
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void ARMELFStreamer::EmitPersonality(const MCSymbol *Per) {
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Personality = Per;
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}
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void ARMELFStreamer::EmitSetFP(unsigned NewFpReg,
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unsigned NewSpReg,
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int64_t Offset) {
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// TODO: Not implemented
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}
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void ARMELFStreamer::EmitPad(int64_t Offset) {
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// TODO: Not implemented
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}
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void ARMELFStreamer::EmitRegSave(const SmallVectorImpl<unsigned> &RegList,
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bool IsVector) {
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// TODO: Not implemented
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}
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namespace llvm {
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MCELFStreamer* createARMELFStreamer(MCContext &Context, MCAsmBackend &TAB,
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raw_ostream &OS, MCCodeEmitter *Emitter,
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