-//===-- MipsELFObjectWriter.cpp - Mips ELF Writer --------------*- C++ -*--===//
+//===-- MipsELFObjectWriter.cpp - Mips ELF Writer -------------------------===//
//
// The LLVM Compiler Infrastructure
//
//
//===----------------------------------------------------------------------===//
+#include "MCTargetDesc/MipsBaseInfo.h"
#include "MCTargetDesc/MipsFixupKinds.h"
#include "MCTargetDesc/MipsMCTargetDesc.h"
+#include "llvm/MC/MCAssembler.h"
#include "llvm/MC/MCELFObjectWriter.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCSection.h"
#include "llvm/MC/MCValue.h"
#include "llvm/Support/ErrorHandling.h"
+#include <list>
using namespace llvm;
namespace {
+ struct RelEntry {
+ RelEntry(const ELFRelocationEntry &R, const MCSymbol *S, int64_t O) :
+ Reloc(R), Sym(S), Offset(O) {}
+ ELFRelocationEntry Reloc;
+ const MCSymbol *Sym;
+ int64_t Offset;
+ };
+
+ typedef std::list<RelEntry> RelLs;
+ typedef RelLs::iterator RelLsIter;
+
class MipsELFObjectWriter : public MCELFObjectTargetWriter {
public:
- MipsELFObjectWriter(uint8_t OSABI);
+ MipsELFObjectWriter(bool _is64Bit, uint8_t OSABI,
+ bool _isN64, bool IsLittleEndian);
virtual ~MipsELFObjectWriter();
const MCFragment &F,
const MCFixup &Fixup,
bool IsPCRel) const;
+ virtual void sortRelocs(const MCAssembler &Asm,
+ std::vector<ELFRelocationEntry> &Relocs);
};
}
-MipsELFObjectWriter::MipsELFObjectWriter(uint8_t OSABI)
- : MCELFObjectTargetWriter(/*Is64Bit*/ false, OSABI, ELF::EM_MIPS,
- /*HasRelocationAddend*/ false) {}
+MipsELFObjectWriter::MipsELFObjectWriter(bool _is64Bit, uint8_t OSABI,
+ bool _isN64, bool IsLittleEndian)
+ : MCELFObjectTargetWriter(_is64Bit, OSABI, ELF::EM_MIPS,
+ /*HasRelocationAddend*/ (_isN64) ? true : false,
+ /*IsN64*/ _isN64) {}
MipsELFObjectWriter::~MipsELFObjectWriter() {}
-// FIXME: get the real EABI Version from the Triple.
+// FIXME: get the real EABI Version from the Subtarget class.
unsigned MipsELFObjectWriter::getEFlags() const {
- return ELF::EF_MIPS_NOREORDER | ELF::EF_MIPS_ARCH_32R2;
+
+ // FIXME: We can't tell if we are PIC (dynamic) or CPIC (static)
+ unsigned Flag = ELF::EF_MIPS_NOREORDER;
+
+ if (is64Bit())
+ Flag |= ELF::EF_MIPS_ARCH_64R2;
+ else
+ Flag |= ELF::EF_MIPS_ARCH_32R2;
+ return Flag;
}
const MCSymbol *MipsELFObjectWriter::ExplicitRelSym(const MCAssembler &Asm,
case FK_Data_4:
Type = ELF::R_MIPS_32;
break;
+ case FK_Data_8:
+ Type = ELF::R_MIPS_64;
+ break;
case FK_GPRel_4:
- Type = ELF::R_MIPS_GPREL32;
+ if (isN64()) {
+ Type = setRType((unsigned)ELF::R_MIPS_GPREL32, Type);
+ Type = setRType2((unsigned)ELF::R_MIPS_64, Type);
+ Type = setRType3((unsigned)ELF::R_MIPS_NONE, Type);
+ }
+ else
+ Type = ELF::R_MIPS_GPREL32;
break;
case Mips::fixup_Mips_GPREL16:
Type = ELF::R_MIPS_GPREL16;
case Mips::fixup_Mips_PC16:
Type = ELF::R_MIPS_PC16;
break;
+ case Mips::fixup_Mips_GOT_PAGE:
+ Type = ELF::R_MIPS_GOT_PAGE;
+ break;
+ case Mips::fixup_Mips_GOT_OFST:
+ Type = ELF::R_MIPS_GOT_OFST;
+ break;
+ case Mips::fixup_Mips_GOT_DISP:
+ Type = ELF::R_MIPS_GOT_DISP;
+ break;
+ case Mips::fixup_Mips_GPOFF_HI:
+ Type = setRType((unsigned)ELF::R_MIPS_GPREL16, Type);
+ Type = setRType2((unsigned)ELF::R_MIPS_SUB, Type);
+ Type = setRType3((unsigned)ELF::R_MIPS_HI16, Type);
+ break;
+ case Mips::fixup_Mips_GPOFF_LO:
+ Type = setRType((unsigned)ELF::R_MIPS_GPREL16, Type);
+ Type = setRType2((unsigned)ELF::R_MIPS_SUB, Type);
+ Type = setRType3((unsigned)ELF::R_MIPS_LO16, Type);
+ break;
+ case Mips::fixup_Mips_HIGHER:
+ Type = ELF::R_MIPS_HIGHER;
+ break;
+ case Mips::fixup_Mips_HIGHEST:
+ Type = ELF::R_MIPS_HIGHEST;
+ break;
+ case Mips::fixup_Mips_GOT_HI16:
+ Type = ELF::R_MIPS_GOT_HI16;
+ break;
+ case Mips::fixup_Mips_GOT_LO16:
+ Type = ELF::R_MIPS_GOT_LO16;
+ break;
+ case Mips::fixup_Mips_CALL_HI16:
+ Type = ELF::R_MIPS_CALL_HI16;
+ break;
+ case Mips::fixup_Mips_CALL_LO16:
+ Type = ELF::R_MIPS_CALL_LO16;
+ break;
}
-
return Type;
}
+// Return true if R is either a GOT16 against a local symbol or HI16.
+static bool NeedsMatchingLo(const MCAssembler &Asm, const RelEntry &R) {
+ if (!R.Sym)
+ return false;
+
+ MCSymbolData &SD = Asm.getSymbolData(R.Sym->AliasedSymbol());
+
+ return ((R.Reloc.Type == ELF::R_MIPS_GOT16) && !SD.isExternal()) ||
+ (R.Reloc.Type == ELF::R_MIPS_HI16);
+}
+
+static bool HasMatchingLo(const MCAssembler &Asm, RelLsIter I, RelLsIter Last) {
+ if (I == Last)
+ return false;
+
+ RelLsIter Hi = I++;
+
+ return (I->Reloc.Type == ELF::R_MIPS_LO16) && (Hi->Sym == I->Sym) &&
+ (Hi->Offset == I->Offset);
+}
+
+static bool HasSameSymbol(const RelEntry &R0, const RelEntry &R1) {
+ return R0.Sym == R1.Sym;
+}
+
+static int CompareOffset(const RelEntry &R0, const RelEntry &R1) {
+ return (R0.Offset > R1.Offset) ? 1 : ((R0.Offset == R1.Offset) ? 0 : -1);
+}
+
+void MipsELFObjectWriter::sortRelocs(const MCAssembler &Asm,
+ std::vector<ELFRelocationEntry> &Relocs) {
+ // Call the default function first. Relocations are sorted in descending
+ // order of r_offset.
+ MCELFObjectTargetWriter::sortRelocs(Asm, Relocs);
+
+ RelLs RelocLs;
+ std::vector<RelLsIter> Unmatched;
+
+ // Fill RelocLs. Traverse Relocs backwards so that relocations in RelocLs
+ // are in ascending order of r_offset.
+ for (std::vector<ELFRelocationEntry>::reverse_iterator R = Relocs.rbegin();
+ R != Relocs.rend(); ++R) {
+ std::pair<const MCSymbolRefExpr*, int64_t> P =
+ MipsGetSymAndOffset(*R->Fixup);
+ RelocLs.push_back(RelEntry(*R, P.first ? &P.first->getSymbol() : 0,
+ P.second));
+ }
+
+ // Get list of unmatched HI16 and GOT16.
+ for (RelLsIter R = RelocLs.begin(); R != RelocLs.end(); ++R)
+ if (NeedsMatchingLo(Asm, *R) && !HasMatchingLo(Asm, R, --RelocLs.end()))
+ Unmatched.push_back(R);
+
+ // Insert unmatched HI16 and GOT16 immediately before their matching LO16.
+ for (std::vector<RelLsIter>::iterator U = Unmatched.begin();
+ U != Unmatched.end(); ++U) {
+ RelLsIter LoPos = RelocLs.end(), HiPos = *U;
+ bool MatchedLo = false;
+
+ for (RelLsIter R = RelocLs.begin(); R != RelocLs.end(); ++R) {
+ if ((R->Reloc.Type == ELF::R_MIPS_LO16) && HasSameSymbol(*HiPos, *R) &&
+ (CompareOffset(*R, *HiPos) >= 0) &&
+ ((LoPos == RelocLs.end()) || ((CompareOffset(*R, *LoPos) < 0)) ||
+ (!MatchedLo && !CompareOffset(*R, *LoPos))))
+ LoPos = R;
+
+ MatchedLo = NeedsMatchingLo(Asm, *R) &&
+ HasMatchingLo(Asm, R, --RelocLs.end());
+ }
+
+ // If a matching LoPos was found, move HiPos and insert it before LoPos.
+ // Make the offsets of HiPos and LoPos match.
+ if (LoPos != RelocLs.end()) {
+ HiPos->Offset = LoPos->Offset;
+ RelocLs.insert(LoPos, *HiPos);
+ RelocLs.erase(HiPos);
+ }
+ }
+
+ // Put the sorted list back in reverse order.
+ assert(Relocs.size() == RelocLs.size());
+ unsigned I = RelocLs.size();
+
+ for (RelLsIter R = RelocLs.begin(); R != RelocLs.end(); ++R)
+ Relocs[--I] = R->Reloc;
+}
+
MCObjectWriter *llvm::createMipsELFObjectWriter(raw_ostream &OS,
- bool IsLittleEndian,
- uint8_t OSABI) {
- MCELFObjectTargetWriter *MOTW = new MipsELFObjectWriter(OSABI);
+ uint8_t OSABI,
+ bool IsLittleEndian,
+ bool Is64Bit) {
+ MCELFObjectTargetWriter *MOTW = new MipsELFObjectWriter(Is64Bit, OSABI,
+ (Is64Bit) ? true : false,
+ IsLittleEndian);
return createELFObjectWriter(MOTW, OS, IsLittleEndian);
}
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