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| author | 2020-08-03 15:06:44 +0000 | |
|---|---|---|
| committer | 2020-08-03 15:06:44 +0000 | |
| commit | b64793999546ed8adebaeebd9d8345d18db8927d (patch) | |
| tree | 4357c27b561d73b0e089727c6ed659f2ceff5f47 /gnu/llvm/lib/Target/Mips/MCTargetDesc/MipsELFObjectWriter.cpp | |
| parent | Add support for UTF-8 DISPLAY-HINTs with octet length. For now only (diff) | |
| download | wireguard-openbsd-b64793999546ed8adebaeebd9d8345d18db8927d.tar.xz wireguard-openbsd-b64793999546ed8adebaeebd9d8345d18db8927d.zip | |
Remove LLVM 8.0.1 files.
Diffstat (limited to 'gnu/llvm/lib/Target/Mips/MCTargetDesc/MipsELFObjectWriter.cpp')
| -rw-r--r-- | gnu/llvm/lib/Target/Mips/MCTargetDesc/MipsELFObjectWriter.cpp | 696 |
1 files changed, 0 insertions, 696 deletions
diff --git a/gnu/llvm/lib/Target/Mips/MCTargetDesc/MipsELFObjectWriter.cpp b/gnu/llvm/lib/Target/Mips/MCTargetDesc/MipsELFObjectWriter.cpp deleted file mode 100644 index 8ace2895d68..00000000000 --- a/gnu/llvm/lib/Target/Mips/MCTargetDesc/MipsELFObjectWriter.cpp +++ /dev/null @@ -1,696 +0,0 @@ -//===-- MipsELFObjectWriter.cpp - Mips ELF Writer -------------------------===// -// -// The LLVM Compiler Infrastructure -// -// This file is distributed under the University of Illinois Open Source -// License. See LICENSE.TXT for details. -// -//===----------------------------------------------------------------------===// - -#include "MCTargetDesc/MipsFixupKinds.h" -#include "MCTargetDesc/MipsMCTargetDesc.h" -#include "llvm/ADT/STLExtras.h" -#include "llvm/BinaryFormat/ELF.h" -#include "llvm/MC/MCContext.h" -#include "llvm/MC/MCELFObjectWriter.h" -#include "llvm/MC/MCFixup.h" -#include "llvm/MC/MCObjectWriter.h" -#include "llvm/MC/MCSymbolELF.h" -#include "llvm/Support/Casting.h" -#include "llvm/Support/Compiler.h" -#include "llvm/Support/Debug.h" -#include "llvm/Support/ErrorHandling.h" -#include "llvm/Support/MathExtras.h" -#include "llvm/Support/raw_ostream.h" -#include <algorithm> -#include <cassert> -#include <cstdint> -#include <iterator> -#include <list> -#include <utility> - -#define DEBUG_TYPE "mips-elf-object-writer" - -using namespace llvm; - -namespace { - -/// Holds additional information needed by the relocation ordering algorithm. -struct MipsRelocationEntry { - const ELFRelocationEntry R; ///< The relocation. - bool Matched = false; ///< Is this relocation part of a match. - - MipsRelocationEntry(const ELFRelocationEntry &R) : R(R) {} - - void print(raw_ostream &Out) const { - R.print(Out); - Out << ", Matched=" << Matched; - } -}; - -#ifndef NDEBUG -raw_ostream &operator<<(raw_ostream &OS, const MipsRelocationEntry &RHS) { - RHS.print(OS); - return OS; -} -#endif - -class MipsELFObjectWriter : public MCELFObjectTargetWriter { -public: - MipsELFObjectWriter(uint8_t OSABI, bool HasRelocationAddend, bool Is64); - - ~MipsELFObjectWriter() override = default; - - unsigned getRelocType(MCContext &Ctx, const MCValue &Target, - const MCFixup &Fixup, bool IsPCRel) const override; - bool needsRelocateWithSymbol(const MCSymbol &Sym, - unsigned Type) const override; - void sortRelocs(const MCAssembler &Asm, - std::vector<ELFRelocationEntry> &Relocs) override; -}; - -/// The possible results of the Predicate function used by find_best. -enum FindBestPredicateResult { - FindBest_NoMatch = 0, ///< The current element is not a match. - FindBest_Match, ///< The current element is a match but better ones are - /// possible. - FindBest_PerfectMatch, ///< The current element is an unbeatable match. -}; - -} // end anonymous namespace - -/// Copy elements in the range [First, Last) to d1 when the predicate is true or -/// d2 when the predicate is false. This is essentially both std::copy_if and -/// std::remove_copy_if combined into a single pass. -template <class InputIt, class OutputIt1, class OutputIt2, class UnaryPredicate> -static std::pair<OutputIt1, OutputIt2> copy_if_else(InputIt First, InputIt Last, - OutputIt1 d1, OutputIt2 d2, - UnaryPredicate Predicate) { - for (InputIt I = First; I != Last; ++I) { - if (Predicate(*I)) { - *d1 = *I; - d1++; - } else { - *d2 = *I; - d2++; - } - } - - return std::make_pair(d1, d2); -} - -/// Find the best match in the range [First, Last). -/// -/// An element matches when Predicate(X) returns FindBest_Match or -/// FindBest_PerfectMatch. A value of FindBest_PerfectMatch also terminates -/// the search. BetterThan(A, B) is a comparator that returns true when A is a -/// better match than B. The return value is the position of the best match. -/// -/// This is similar to std::find_if but finds the best of multiple possible -/// matches. -template <class InputIt, class UnaryPredicate, class Comparator> -static InputIt find_best(InputIt First, InputIt Last, UnaryPredicate Predicate, - Comparator BetterThan) { - InputIt Best = Last; - - for (InputIt I = First; I != Last; ++I) { - unsigned Matched = Predicate(*I); - if (Matched != FindBest_NoMatch) { - LLVM_DEBUG(dbgs() << std::distance(First, I) << " is a match ("; - I->print(dbgs()); dbgs() << ")\n"); - if (Best == Last || BetterThan(*I, *Best)) { - LLVM_DEBUG(dbgs() << ".. and it beats the last one\n"); - Best = I; - } - } - if (Matched == FindBest_PerfectMatch) { - LLVM_DEBUG(dbgs() << ".. and it is unbeatable\n"); - break; - } - } - - return Best; -} - -/// Determine the low relocation that matches the given relocation. -/// If the relocation does not need a low relocation then the return value -/// is ELF::R_MIPS_NONE. -/// -/// The relocations that need a matching low part are -/// R_(MIPS|MICROMIPS|MIPS16)_HI16 for all symbols and -/// R_(MIPS|MICROMIPS|MIPS16)_GOT16 for local symbols only. -static unsigned getMatchingLoType(const ELFRelocationEntry &Reloc) { - unsigned Type = Reloc.Type; - if (Type == ELF::R_MIPS_HI16) - return ELF::R_MIPS_LO16; - if (Type == ELF::R_MICROMIPS_HI16) - return ELF::R_MICROMIPS_LO16; - if (Type == ELF::R_MIPS16_HI16) - return ELF::R_MIPS16_LO16; - - if (Reloc.OriginalSymbol && - Reloc.OriginalSymbol->getBinding() != ELF::STB_LOCAL) - return ELF::R_MIPS_NONE; - - if (Type == ELF::R_MIPS_GOT16) - return ELF::R_MIPS_LO16; - if (Type == ELF::R_MICROMIPS_GOT16) - return ELF::R_MICROMIPS_LO16; - if (Type == ELF::R_MIPS16_GOT16) - return ELF::R_MIPS16_LO16; - - return ELF::R_MIPS_NONE; -} - -/// Determine whether a relocation (X) matches the one given in R. -/// -/// A relocation matches if: -/// - It's type matches that of a corresponding low part. This is provided in -/// MatchingType for efficiency. -/// - It's based on the same symbol. -/// - It's offset of greater or equal to that of the one given in R. -/// It should be noted that this rule assumes the programmer does not use -/// offsets that exceed the alignment of the symbol. The carry-bit will be -/// incorrect if this is not true. -/// -/// A matching relocation is unbeatable if: -/// - It is not already involved in a match. -/// - It's offset is exactly that of the one given in R. -static FindBestPredicateResult isMatchingReloc(const MipsRelocationEntry &X, - const ELFRelocationEntry &R, - unsigned MatchingType) { - if (X.R.Type == MatchingType && X.R.OriginalSymbol == R.OriginalSymbol) { - if (!X.Matched && - X.R.OriginalAddend == R.OriginalAddend) - return FindBest_PerfectMatch; - else if (X.R.OriginalAddend >= R.OriginalAddend) - return FindBest_Match; - } - return FindBest_NoMatch; -} - -/// Determine whether Candidate or PreviousBest is the better match. -/// The return value is true if Candidate is the better match. -/// -/// A matching relocation is a better match if: -/// - It has a smaller addend. -/// - It is not already involved in a match. -static bool compareMatchingRelocs(const MipsRelocationEntry &Candidate, - const MipsRelocationEntry &PreviousBest) { - if (Candidate.R.OriginalAddend != PreviousBest.R.OriginalAddend) - return Candidate.R.OriginalAddend < PreviousBest.R.OriginalAddend; - return PreviousBest.Matched && !Candidate.Matched; -} - -#ifndef NDEBUG -/// Print all the relocations. -template <class Container> -static void dumpRelocs(const char *Prefix, const Container &Relocs) { - for (const auto &R : Relocs) - dbgs() << Prefix << R << "\n"; -} -#endif - -MipsELFObjectWriter::MipsELFObjectWriter(uint8_t OSABI, - bool HasRelocationAddend, bool Is64) - : MCELFObjectTargetWriter(Is64, OSABI, ELF::EM_MIPS, HasRelocationAddend) {} - -unsigned MipsELFObjectWriter::getRelocType(MCContext &Ctx, - const MCValue &Target, - const MCFixup &Fixup, - bool IsPCRel) const { - // Determine the type of the relocation. - unsigned Kind = (unsigned)Fixup.getKind(); - - switch (Kind) { - case Mips::fixup_Mips_NONE: - return ELF::R_MIPS_NONE; - case FK_Data_1: - Ctx.reportError(Fixup.getLoc(), - "MIPS does not support one byte relocations"); - return ELF::R_MIPS_NONE; - case Mips::fixup_Mips_16: - case FK_Data_2: - return IsPCRel ? ELF::R_MIPS_PC16 : ELF::R_MIPS_16; - case Mips::fixup_Mips_32: - case FK_Data_4: - return IsPCRel ? ELF::R_MIPS_PC32 : ELF::R_MIPS_32; - } - - if (IsPCRel) { - switch (Kind) { - case FK_Data_8: - Ctx.reportError(Fixup.getLoc(), - "MIPS does not support 64-bit PC-relative relocations"); - return ELF::R_MIPS_NONE; - case Mips::fixup_Mips_Branch_PCRel: - case Mips::fixup_Mips_PC16: - return ELF::R_MIPS_PC16; - case Mips::fixup_MICROMIPS_PC7_S1: - return ELF::R_MICROMIPS_PC7_S1; - case Mips::fixup_MICROMIPS_PC10_S1: - return ELF::R_MICROMIPS_PC10_S1; - case Mips::fixup_MICROMIPS_PC16_S1: - return ELF::R_MICROMIPS_PC16_S1; - case Mips::fixup_MICROMIPS_PC26_S1: - return ELF::R_MICROMIPS_PC26_S1; - case Mips::fixup_MICROMIPS_PC19_S2: - return ELF::R_MICROMIPS_PC19_S2; - case Mips::fixup_MICROMIPS_PC18_S3: - return ELF::R_MICROMIPS_PC18_S3; - case Mips::fixup_MICROMIPS_PC21_S1: - return ELF::R_MICROMIPS_PC21_S1; - case Mips::fixup_MIPS_PC19_S2: - return ELF::R_MIPS_PC19_S2; - case Mips::fixup_MIPS_PC18_S3: - return ELF::R_MIPS_PC18_S3; - case Mips::fixup_MIPS_PC21_S2: - return ELF::R_MIPS_PC21_S2; - case Mips::fixup_MIPS_PC26_S2: - return ELF::R_MIPS_PC26_S2; - case Mips::fixup_MIPS_PCHI16: - return ELF::R_MIPS_PCHI16; - case Mips::fixup_MIPS_PCLO16: - return ELF::R_MIPS_PCLO16; - } - - llvm_unreachable("invalid PC-relative fixup kind!"); - } - - switch (Kind) { - case Mips::fixup_Mips_64: - case FK_Data_8: - return ELF::R_MIPS_64; - case FK_DTPRel_4: - return ELF::R_MIPS_TLS_DTPREL32; - case FK_DTPRel_8: - return ELF::R_MIPS_TLS_DTPREL64; - case FK_TPRel_4: - return ELF::R_MIPS_TLS_TPREL32; - case FK_TPRel_8: - return ELF::R_MIPS_TLS_TPREL64; - case FK_GPRel_4: - if (is64Bit()) { - unsigned Type = (unsigned)ELF::R_MIPS_NONE; - Type = setRType((unsigned)ELF::R_MIPS_GPREL32, Type); - Type = setRType2((unsigned)ELF::R_MIPS_64, Type); - Type = setRType3((unsigned)ELF::R_MIPS_NONE, Type); - return Type; - } - return ELF::R_MIPS_GPREL32; - case Mips::fixup_Mips_GPREL16: - return ELF::R_MIPS_GPREL16; - case Mips::fixup_Mips_26: - return ELF::R_MIPS_26; - case Mips::fixup_Mips_CALL16: - return ELF::R_MIPS_CALL16; - case Mips::fixup_Mips_GOT: - return ELF::R_MIPS_GOT16; - case Mips::fixup_Mips_HI16: - return ELF::R_MIPS_HI16; - case Mips::fixup_Mips_LO16: - return ELF::R_MIPS_LO16; - case Mips::fixup_Mips_TLSGD: - return ELF::R_MIPS_TLS_GD; - case Mips::fixup_Mips_GOTTPREL: - return ELF::R_MIPS_TLS_GOTTPREL; - case Mips::fixup_Mips_TPREL_HI: - return ELF::R_MIPS_TLS_TPREL_HI16; - case Mips::fixup_Mips_TPREL_LO: - return ELF::R_MIPS_TLS_TPREL_LO16; - case Mips::fixup_Mips_TLSLDM: - return ELF::R_MIPS_TLS_LDM; - case Mips::fixup_Mips_DTPREL_HI: - return ELF::R_MIPS_TLS_DTPREL_HI16; - case Mips::fixup_Mips_DTPREL_LO: - return ELF::R_MIPS_TLS_DTPREL_LO16; - case Mips::fixup_Mips_GOT_PAGE: - return ELF::R_MIPS_GOT_PAGE; - case Mips::fixup_Mips_GOT_OFST: - return ELF::R_MIPS_GOT_OFST; - case Mips::fixup_Mips_GOT_DISP: - return ELF::R_MIPS_GOT_DISP; - case Mips::fixup_Mips_GPOFF_HI: { - unsigned Type = (unsigned)ELF::R_MIPS_NONE; - Type = setRType((unsigned)ELF::R_MIPS_GPREL16, Type); - Type = setRType2((unsigned)ELF::R_MIPS_SUB, Type); - Type = setRType3((unsigned)ELF::R_MIPS_HI16, Type); - return Type; - } - case Mips::fixup_MICROMIPS_GPOFF_HI: { - unsigned Type = (unsigned)ELF::R_MIPS_NONE; - Type = setRType((unsigned)ELF::R_MICROMIPS_GPREL16, Type); - Type = setRType2((unsigned)ELF::R_MICROMIPS_SUB, Type); - Type = setRType3((unsigned)ELF::R_MICROMIPS_HI16, Type); - return Type; - } - case Mips::fixup_Mips_GPOFF_LO: { - unsigned Type = (unsigned)ELF::R_MIPS_NONE; - Type = setRType((unsigned)ELF::R_MIPS_GPREL16, Type); - Type = setRType2((unsigned)ELF::R_MIPS_SUB, Type); - Type = setRType3((unsigned)ELF::R_MIPS_LO16, Type); - return Type; - } - case Mips::fixup_MICROMIPS_GPOFF_LO: { - unsigned Type = (unsigned)ELF::R_MIPS_NONE; - Type = setRType((unsigned)ELF::R_MICROMIPS_GPREL16, Type); - Type = setRType2((unsigned)ELF::R_MICROMIPS_SUB, Type); - Type = setRType3((unsigned)ELF::R_MICROMIPS_LO16, Type); - return Type; - } - case Mips::fixup_Mips_HIGHER: - return ELF::R_MIPS_HIGHER; - case Mips::fixup_Mips_HIGHEST: - return ELF::R_MIPS_HIGHEST; - case Mips::fixup_Mips_SUB: - return ELF::R_MIPS_SUB; - case Mips::fixup_Mips_GOT_HI16: - return ELF::R_MIPS_GOT_HI16; - case Mips::fixup_Mips_GOT_LO16: - return ELF::R_MIPS_GOT_LO16; - case Mips::fixup_Mips_CALL_HI16: - return ELF::R_MIPS_CALL_HI16; - case Mips::fixup_Mips_CALL_LO16: - return ELF::R_MIPS_CALL_LO16; - case Mips::fixup_MICROMIPS_26_S1: - return ELF::R_MICROMIPS_26_S1; - case Mips::fixup_MICROMIPS_HI16: - return ELF::R_MICROMIPS_HI16; - case Mips::fixup_MICROMIPS_LO16: - return ELF::R_MICROMIPS_LO16; - case Mips::fixup_MICROMIPS_GOT16: - return ELF::R_MICROMIPS_GOT16; - case Mips::fixup_MICROMIPS_CALL16: - return ELF::R_MICROMIPS_CALL16; - case Mips::fixup_MICROMIPS_GOT_DISP: - return ELF::R_MICROMIPS_GOT_DISP; - case Mips::fixup_MICROMIPS_GOT_PAGE: - return ELF::R_MICROMIPS_GOT_PAGE; - case Mips::fixup_MICROMIPS_GOT_OFST: - return ELF::R_MICROMIPS_GOT_OFST; - case Mips::fixup_MICROMIPS_TLS_GD: - return ELF::R_MICROMIPS_TLS_GD; - case Mips::fixup_MICROMIPS_TLS_LDM: - return ELF::R_MICROMIPS_TLS_LDM; - case Mips::fixup_MICROMIPS_TLS_DTPREL_HI16: - return ELF::R_MICROMIPS_TLS_DTPREL_HI16; - case Mips::fixup_MICROMIPS_TLS_DTPREL_LO16: - return ELF::R_MICROMIPS_TLS_DTPREL_LO16; - case Mips::fixup_MICROMIPS_GOTTPREL: - return ELF::R_MICROMIPS_TLS_GOTTPREL; - case Mips::fixup_MICROMIPS_TLS_TPREL_HI16: - return ELF::R_MICROMIPS_TLS_TPREL_HI16; - case Mips::fixup_MICROMIPS_TLS_TPREL_LO16: - return ELF::R_MICROMIPS_TLS_TPREL_LO16; - case Mips::fixup_MICROMIPS_SUB: - return ELF::R_MICROMIPS_SUB; - case Mips::fixup_MICROMIPS_HIGHER: - return ELF::R_MICROMIPS_HIGHER; - case Mips::fixup_MICROMIPS_HIGHEST: - return ELF::R_MICROMIPS_HIGHEST; - case Mips::fixup_Mips_JALR: - return ELF::R_MIPS_JALR; - case Mips::fixup_MICROMIPS_JALR: - return ELF::R_MICROMIPS_JALR; - } - - llvm_unreachable("invalid fixup kind!"); -} - -/// Sort relocation table entries by offset except where another order is -/// required by the MIPS ABI. -/// -/// MIPS has a few relocations that have an AHL component in the expression used -/// to evaluate them. This AHL component is an addend with the same number of -/// bits as a symbol value but not all of our ABI's are able to supply a -/// sufficiently sized addend in a single relocation. -/// -/// The O32 ABI for example, uses REL relocations which store the addend in the -/// section data. All the relocations with AHL components affect 16-bit fields -/// so the addend for a single relocation is limited to 16-bit. This ABI -/// resolves the limitation by linking relocations (e.g. R_MIPS_HI16 and -/// R_MIPS_LO16) and distributing the addend between the linked relocations. The -/// ABI mandates that such relocations must be next to each other in a -/// particular order (e.g. R_MIPS_HI16 must be immediately followed by a -/// matching R_MIPS_LO16) but the rule is less strict in practice. -/// -/// The de facto standard is lenient in the following ways: -/// - 'Immediately following' does not refer to the next relocation entry but -/// the next matching relocation. -/// - There may be multiple high parts relocations for one low part relocation. -/// - There may be multiple low part relocations for one high part relocation. -/// - The AHL addend in each part does not have to be exactly equal as long as -/// the difference does not affect the carry bit from bit 15 into 16. This is -/// to allow, for example, the use of %lo(foo) and %lo(foo+4) when loading -/// both halves of a long long. -/// -/// See getMatchingLoType() for a description of which high part relocations -/// match which low part relocations. One particular thing to note is that -/// R_MIPS_GOT16 and similar only have AHL addends if they refer to local -/// symbols. -/// -/// It should also be noted that this function is not affected by whether -/// the symbol was kept or rewritten into a section-relative equivalent. We -/// always match using the expressions from the source. -void MipsELFObjectWriter::sortRelocs(const MCAssembler &Asm, - std::vector<ELFRelocationEntry> &Relocs) { - // We do not need to sort the relocation table for RELA relocations which - // N32/N64 uses as the relocation addend contains the value we require, - // rather than it being split across a pair of relocations. - if (hasRelocationAddend()) - return; - - if (Relocs.size() < 2) - return; - - // Sort relocations by the address they are applied to. - llvm::sort(Relocs, - [](const ELFRelocationEntry &A, const ELFRelocationEntry &B) { - return A.Offset < B.Offset; - }); - - std::list<MipsRelocationEntry> Sorted; - std::list<ELFRelocationEntry> Remainder; - - LLVM_DEBUG(dumpRelocs("R: ", Relocs)); - - // Separate the movable relocations (AHL relocations using the high bits) from - // the immobile relocations (everything else). This does not preserve high/low - // matches that already existed in the input. - copy_if_else(Relocs.begin(), Relocs.end(), std::back_inserter(Remainder), - std::back_inserter(Sorted), [](const ELFRelocationEntry &Reloc) { - return getMatchingLoType(Reloc) != ELF::R_MIPS_NONE; - }); - - for (auto &R : Remainder) { - LLVM_DEBUG(dbgs() << "Matching: " << R << "\n"); - - unsigned MatchingType = getMatchingLoType(R); - assert(MatchingType != ELF::R_MIPS_NONE && - "Wrong list for reloc that doesn't need a match"); - - // Find the best matching relocation for the current high part. - // See isMatchingReloc for a description of a matching relocation and - // compareMatchingRelocs for a description of what 'best' means. - auto InsertionPoint = - find_best(Sorted.begin(), Sorted.end(), - [&R, &MatchingType](const MipsRelocationEntry &X) { - return isMatchingReloc(X, R, MatchingType); - }, - compareMatchingRelocs); - - // If we matched then insert the high part in front of the match and mark - // both relocations as being involved in a match. We only mark the high - // part for cosmetic reasons in the debug output. - // - // If we failed to find a match then the high part is orphaned. This is not - // permitted since the relocation cannot be evaluated without knowing the - // carry-in. We can sometimes handle this using a matching low part that is - // already used in a match but we already cover that case in - // isMatchingReloc and compareMatchingRelocs. For the remaining cases we - // should insert the high part at the end of the list. This will cause the - // linker to fail but the alternative is to cause the linker to bind the - // high part to a semi-matching low part and silently calculate the wrong - // value. Unfortunately we have no means to warn the user that we did this - // so leave it up to the linker to complain about it. - if (InsertionPoint != Sorted.end()) - InsertionPoint->Matched = true; - Sorted.insert(InsertionPoint, R)->Matched = true; - } - - LLVM_DEBUG(dumpRelocs("S: ", Sorted)); - - assert(Relocs.size() == Sorted.size() && "Some relocs were not consumed"); - - // Overwrite the original vector with the sorted elements. The caller expects - // them in reverse order. - unsigned CopyTo = 0; - for (const auto &R : reverse(Sorted)) - Relocs[CopyTo++] = R.R; -} - -bool MipsELFObjectWriter::needsRelocateWithSymbol(const MCSymbol &Sym, - unsigned Type) const { - // If it's a compound relocation for N64 then we need the relocation if any - // sub-relocation needs it. - if (!isUInt<8>(Type)) - return needsRelocateWithSymbol(Sym, Type & 0xff) || - needsRelocateWithSymbol(Sym, (Type >> 8) & 0xff) || - needsRelocateWithSymbol(Sym, (Type >> 16) & 0xff); - - switch (Type) { - default: - errs() << Type << "\n"; - llvm_unreachable("Unexpected relocation"); - return true; - - // This relocation doesn't affect the section data. - case ELF::R_MIPS_NONE: - return false; - - // On REL ABI's (e.g. O32), these relocations form pairs. The pairing is done - // by the static linker by matching the symbol and offset. - // We only see one relocation at a time but it's still safe to relocate with - // the section so long as both relocations make the same decision. - // - // Some older linkers may require the symbol for particular cases. Such cases - // are not supported yet but can be added as required. - case ELF::R_MIPS_GOT16: - case ELF::R_MIPS16_GOT16: - case ELF::R_MICROMIPS_GOT16: - case ELF::R_MIPS_HIGHER: - case ELF::R_MIPS_HIGHEST: - case ELF::R_MIPS_HI16: - case ELF::R_MIPS16_HI16: - case ELF::R_MICROMIPS_HI16: - case ELF::R_MIPS_LO16: - case ELF::R_MIPS16_LO16: - case ELF::R_MICROMIPS_LO16: - // FIXME: It should be safe to return false for the STO_MIPS_MICROMIPS but - // we neglect to handle the adjustment to the LSB of the addend that - // it causes in applyFixup() and similar. - if (cast<MCSymbolELF>(Sym).getOther() & ELF::STO_MIPS_MICROMIPS) - return true; - return false; - - case ELF::R_MIPS_GOT_PAGE: - case ELF::R_MICROMIPS_GOT_PAGE: - case ELF::R_MIPS_GOT_OFST: - case ELF::R_MICROMIPS_GOT_OFST: - case ELF::R_MIPS_16: - case ELF::R_MIPS_32: - case ELF::R_MIPS_GPREL32: - if (cast<MCSymbolELF>(Sym).getOther() & ELF::STO_MIPS_MICROMIPS) - return true; - LLVM_FALLTHROUGH; - case ELF::R_MIPS_26: - case ELF::R_MIPS_64: - case ELF::R_MIPS_GPREL16: - case ELF::R_MIPS_PC16: - case ELF::R_MIPS_SUB: - return false; - - // FIXME: Many of these relocations should probably return false but this - // hasn't been confirmed to be safe yet. - case ELF::R_MIPS_REL32: - case ELF::R_MIPS_LITERAL: - case ELF::R_MIPS_CALL16: - case ELF::R_MIPS_SHIFT5: - case ELF::R_MIPS_SHIFT6: - case ELF::R_MIPS_GOT_DISP: - case ELF::R_MIPS_GOT_HI16: - case ELF::R_MIPS_GOT_LO16: - case ELF::R_MIPS_INSERT_A: - case ELF::R_MIPS_INSERT_B: - case ELF::R_MIPS_DELETE: - case ELF::R_MIPS_CALL_HI16: - case ELF::R_MIPS_CALL_LO16: - case ELF::R_MIPS_SCN_DISP: - case ELF::R_MIPS_REL16: - case ELF::R_MIPS_ADD_IMMEDIATE: - case ELF::R_MIPS_PJUMP: - case ELF::R_MIPS_RELGOT: - case ELF::R_MIPS_JALR: - case ELF::R_MIPS_TLS_DTPMOD32: - case ELF::R_MIPS_TLS_DTPREL32: - case ELF::R_MIPS_TLS_DTPMOD64: - case ELF::R_MIPS_TLS_DTPREL64: - case ELF::R_MIPS_TLS_GD: - case ELF::R_MIPS_TLS_LDM: - case ELF::R_MIPS_TLS_DTPREL_HI16: - case ELF::R_MIPS_TLS_DTPREL_LO16: - case ELF::R_MIPS_TLS_GOTTPREL: - case ELF::R_MIPS_TLS_TPREL32: - case ELF::R_MIPS_TLS_TPREL64: - case ELF::R_MIPS_TLS_TPREL_HI16: - case ELF::R_MIPS_TLS_TPREL_LO16: - case ELF::R_MIPS_GLOB_DAT: - case ELF::R_MIPS_PC21_S2: - case ELF::R_MIPS_PC26_S2: - case ELF::R_MIPS_PC18_S3: - case ELF::R_MIPS_PC19_S2: - case ELF::R_MIPS_PCHI16: - case ELF::R_MIPS_PCLO16: - case ELF::R_MIPS_COPY: - case ELF::R_MIPS_JUMP_SLOT: - case ELF::R_MIPS_NUM: - case ELF::R_MIPS_PC32: - case ELF::R_MIPS_EH: - case ELF::R_MICROMIPS_26_S1: - case ELF::R_MICROMIPS_GPREL16: - case ELF::R_MICROMIPS_LITERAL: - case ELF::R_MICROMIPS_PC7_S1: - case ELF::R_MICROMIPS_PC10_S1: - case ELF::R_MICROMIPS_PC16_S1: - case ELF::R_MICROMIPS_CALL16: - case ELF::R_MICROMIPS_GOT_DISP: - case ELF::R_MICROMIPS_GOT_HI16: - case ELF::R_MICROMIPS_GOT_LO16: - case ELF::R_MICROMIPS_SUB: - case ELF::R_MICROMIPS_HIGHER: - case ELF::R_MICROMIPS_HIGHEST: - case ELF::R_MICROMIPS_CALL_HI16: - case ELF::R_MICROMIPS_CALL_LO16: - case ELF::R_MICROMIPS_SCN_DISP: - case ELF::R_MICROMIPS_JALR: - case ELF::R_MICROMIPS_HI0_LO16: - case ELF::R_MICROMIPS_TLS_GD: - case ELF::R_MICROMIPS_TLS_LDM: - case ELF::R_MICROMIPS_TLS_DTPREL_HI16: - case ELF::R_MICROMIPS_TLS_DTPREL_LO16: - case ELF::R_MICROMIPS_TLS_GOTTPREL: - case ELF::R_MICROMIPS_TLS_TPREL_HI16: - case ELF::R_MICROMIPS_TLS_TPREL_LO16: - case ELF::R_MICROMIPS_GPREL7_S2: - case ELF::R_MICROMIPS_PC23_S2: - case ELF::R_MICROMIPS_PC21_S1: - case ELF::R_MICROMIPS_PC26_S1: - case ELF::R_MICROMIPS_PC18_S3: - case ELF::R_MICROMIPS_PC19_S2: - return true; - - // FIXME: Many of these should probably return false but MIPS16 isn't - // supported by the integrated assembler. - case ELF::R_MIPS16_26: - case ELF::R_MIPS16_GPREL: - case ELF::R_MIPS16_CALL16: - case ELF::R_MIPS16_TLS_GD: - case ELF::R_MIPS16_TLS_LDM: - case ELF::R_MIPS16_TLS_DTPREL_HI16: - case ELF::R_MIPS16_TLS_DTPREL_LO16: - case ELF::R_MIPS16_TLS_GOTTPREL: - case ELF::R_MIPS16_TLS_TPREL_HI16: - case ELF::R_MIPS16_TLS_TPREL_LO16: - llvm_unreachable("Unsupported MIPS16 relocation"); - return true; - } -} - -std::unique_ptr<MCObjectTargetWriter> -llvm::createMipsELFObjectWriter(const Triple &TT, bool IsN32) { - uint8_t OSABI = MCELFObjectTargetWriter::getOSABI(TT.getOS()); - bool IsN64 = TT.isArch64Bit() && !IsN32; - bool HasRelocationAddend = TT.isArch64Bit(); - return llvm::make_unique<MipsELFObjectWriter>(OSABI, HasRelocationAddend, - IsN64); -} |
