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-rw-r--r--ELF/Target.h233
1 files changed, 117 insertions, 116 deletions
diff --git a/ELF/Target.h b/ELF/Target.h
index 685ad05ecd664..effa6001f6d96 100644
--- a/ELF/Target.h
+++ b/ELF/Target.h
@@ -1,9 +1,8 @@
//===- Target.h -------------------------------------------------*- C++ -*-===//
//
-// The LLVM Linker
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
@@ -17,7 +16,7 @@
#include <array>
namespace lld {
-std::string toString(elf::RelType Type);
+std::string toString(elf::RelType type);
namespace elf {
class Defined;
@@ -27,36 +26,39 @@ class Symbol;
class TargetInfo {
public:
virtual uint32_t calcEFlags() const { return 0; }
- virtual RelType getDynRel(RelType Type) const { return Type; }
- virtual void writeGotPltHeader(uint8_t *Buf) const {}
- virtual void writeGotHeader(uint8_t *Buf) const {}
- virtual void writeGotPlt(uint8_t *Buf, const Symbol &S) const {};
- virtual void writeIgotPlt(uint8_t *Buf, const Symbol &S) const;
- virtual int64_t getImplicitAddend(const uint8_t *Buf, RelType Type) const;
+ virtual RelExpr getRelExpr(RelType type, const Symbol &s,
+ const uint8_t *loc) const = 0;
+ virtual RelType getDynRel(RelType type) const { return 0; }
+ virtual void writeGotPltHeader(uint8_t *buf) const {}
+ virtual void writeGotHeader(uint8_t *buf) const {}
+ virtual void writeGotPlt(uint8_t *buf, const Symbol &s) const {};
+ virtual void writeIgotPlt(uint8_t *buf, const Symbol &s) const;
+ virtual int64_t getImplicitAddend(const uint8_t *buf, RelType type) const;
+ virtual int getTlsGdRelaxSkip(RelType type) const { return 1; }
// If lazy binding is supported, the first entry of the PLT has code
// to call the dynamic linker to resolve PLT entries the first time
// they are called. This function writes that code.
- virtual void writePltHeader(uint8_t *Buf) const {}
+ virtual void writePltHeader(uint8_t *buf) const {}
- virtual void writePlt(uint8_t *Buf, uint64_t GotEntryAddr,
- uint64_t PltEntryAddr, int32_t Index,
- unsigned RelOff) const {}
- virtual void addPltHeaderSymbols(InputSection &IS) const {}
- virtual void addPltSymbols(InputSection &IS, uint64_t Off) const {}
+ virtual void writePlt(uint8_t *buf, uint64_t gotEntryAddr,
+ uint64_t pltEntryAddr, int32_t index,
+ unsigned relOff) const {}
+ virtual void addPltHeaderSymbols(InputSection &isec) const {}
+ virtual void addPltSymbols(InputSection &isec, uint64_t off) const {}
// Returns true if a relocation only uses the low bits of a value such that
// all those bits are in the same page. For example, if the relocation
// only uses the low 12 bits in a system with 4k pages. If this is true, the
// bits will always have the same value at runtime and we don't have to emit
// a dynamic relocation.
- virtual bool usesOnlyLowPageBits(RelType Type) const;
+ virtual bool usesOnlyLowPageBits(RelType type) const;
// Decide whether a Thunk is needed for the relocation from File
// targeting S.
- virtual bool needsThunk(RelExpr Expr, RelType RelocType,
- const InputFile *File, uint64_t BranchAddr,
- const Symbol &S) const;
+ virtual bool needsThunk(RelExpr expr, RelType relocType,
+ const InputFile *file, uint64_t branchAddr,
+ const Symbol &s) const;
// On systems with range extensions we place collections of Thunks at
// regular spacings that enable the majority of branches reach the Thunks.
@@ -68,77 +70,71 @@ public:
// to do the right thing. See https://gcc.gnu.org/wiki/SplitStacks.
// The symbols st_other flags are needed on PowerPC64 for determining the
// offset to the split-stack prologue.
- virtual bool adjustPrologueForCrossSplitStack(uint8_t *Loc, uint8_t *End,
- uint8_t StOther) const;
+ virtual bool adjustPrologueForCrossSplitStack(uint8_t *loc, uint8_t *end,
+ uint8_t stOther) const;
- // Return true if we can reach Dst from Src with Relocation RelocType
- virtual bool inBranchRange(RelType Type, uint64_t Src,
- uint64_t Dst) const;
- virtual RelExpr getRelExpr(RelType Type, const Symbol &S,
- const uint8_t *Loc) const = 0;
+ // Return true if we can reach dst from src with RelType type.
+ virtual bool inBranchRange(RelType type, uint64_t src,
+ uint64_t dst) const;
- virtual void relocateOne(uint8_t *Loc, RelType Type, uint64_t Val) const = 0;
+ virtual void relocateOne(uint8_t *loc, RelType type, uint64_t val) const = 0;
virtual ~TargetInfo();
- unsigned TlsGdRelaxSkip = 1;
- unsigned PageSize = 4096;
- unsigned DefaultMaxPageSize = 4096;
+ unsigned defaultCommonPageSize = 4096;
+ unsigned defaultMaxPageSize = 4096;
- uint64_t getImageBase();
+ uint64_t getImageBase() const;
- // Offset of _GLOBAL_OFFSET_TABLE_ from base of .got or .got.plt section.
- uint64_t GotBaseSymOff = 0;
// True if _GLOBAL_OFFSET_TABLE_ is relative to .got.plt, false if .got.
- bool GotBaseSymInGotPlt = true;
-
- RelType CopyRel;
- RelType GotRel;
- RelType NoneRel;
- RelType PltRel;
- RelType RelativeRel;
- RelType IRelativeRel;
- RelType TlsDescRel;
- RelType TlsGotRel;
- RelType TlsModuleIndexRel;
- RelType TlsOffsetRel;
- unsigned GotEntrySize = 0;
- unsigned GotPltEntrySize = 0;
- unsigned PltEntrySize;
- unsigned PltHeaderSize;
+ bool gotBaseSymInGotPlt = true;
+
+ RelType copyRel;
+ RelType gotRel;
+ RelType noneRel;
+ RelType pltRel;
+ RelType relativeRel;
+ RelType iRelativeRel;
+ RelType symbolicRel;
+ RelType tlsDescRel;
+ RelType tlsGotRel;
+ RelType tlsModuleIndexRel;
+ RelType tlsOffsetRel;
+ unsigned pltEntrySize;
+ unsigned pltHeaderSize;
// At least on x86_64 positions 1 and 2 are used by the first plt entry
// to support lazy loading.
- unsigned GotPltHeaderEntriesNum = 3;
+ unsigned gotPltHeaderEntriesNum = 3;
// On PPC ELF V2 abi, the first entry in the .got is the .TOC.
- unsigned GotHeaderEntriesNum = 0;
+ unsigned gotHeaderEntriesNum = 0;
- bool NeedsThunks = false;
+ bool needsThunks = false;
// A 4-byte field corresponding to one or more trap instructions, used to pad
// executable OutputSections.
- std::array<uint8_t, 4> TrapInstr;
+ std::array<uint8_t, 4> trapInstr;
// If a target needs to rewrite calls to __morestack to instead call
// __morestack_non_split when a split-stack enabled caller calls a
// non-split-stack callee this will return true. Otherwise returns false.
- bool NeedsMoreStackNonSplit = true;
+ bool needsMoreStackNonSplit = true;
- virtual RelExpr adjustRelaxExpr(RelType Type, const uint8_t *Data,
- RelExpr Expr) const;
- virtual void relaxGot(uint8_t *Loc, uint64_t Val) const;
- virtual void relaxTlsGdToIe(uint8_t *Loc, RelType Type, uint64_t Val) const;
- virtual void relaxTlsGdToLe(uint8_t *Loc, RelType Type, uint64_t Val) const;
- virtual void relaxTlsIeToLe(uint8_t *Loc, RelType Type, uint64_t Val) const;
- virtual void relaxTlsLdToLe(uint8_t *Loc, RelType Type, uint64_t Val) const;
+ virtual RelExpr adjustRelaxExpr(RelType type, const uint8_t *data,
+ RelExpr expr) const;
+ virtual void relaxGot(uint8_t *loc, RelType type, uint64_t val) const;
+ virtual void relaxTlsGdToIe(uint8_t *loc, RelType type, uint64_t val) const;
+ virtual void relaxTlsGdToLe(uint8_t *loc, RelType type, uint64_t val) const;
+ virtual void relaxTlsIeToLe(uint8_t *loc, RelType type, uint64_t val) const;
+ virtual void relaxTlsLdToLe(uint8_t *loc, RelType type, uint64_t val) const;
protected:
// On FreeBSD x86_64 the first page cannot be mmaped.
// On Linux that is controled by vm.mmap_min_addr. At least on some x86_64
// installs that is 65536, so the first 15 pages cannot be used.
// Given that, the smallest value that can be used in here is 0x10000.
- uint64_t DefaultImageBase = 0x10000;
+ uint64_t defaultImageBase = 0x10000;
};
TargetInfo *getAArch64TargetInfo();
@@ -151,108 +147,113 @@ TargetInfo *getPPC64TargetInfo();
TargetInfo *getPPCTargetInfo();
TargetInfo *getRISCVTargetInfo();
TargetInfo *getSPARCV9TargetInfo();
-TargetInfo *getX32TargetInfo();
TargetInfo *getX86TargetInfo();
TargetInfo *getX86_64TargetInfo();
template <class ELFT> TargetInfo *getMipsTargetInfo();
struct ErrorPlace {
- InputSectionBase *IS;
- std::string Loc;
+ InputSectionBase *isec;
+ std::string loc;
};
// Returns input section and corresponding source string for the given location.
-ErrorPlace getErrorPlace(const uint8_t *Loc);
+ErrorPlace getErrorPlace(const uint8_t *loc);
-static inline std::string getErrorLocation(const uint8_t *Loc) {
- return getErrorPlace(Loc).Loc;
+static inline std::string getErrorLocation(const uint8_t *loc) {
+ return getErrorPlace(loc).loc;
}
-// In the PowerPC64 Elf V2 abi a function can have 2 entry points. The first is
-// a global entry point (GEP) which typically is used to intiailzie the TOC
+void writePPC32GlinkSection(uint8_t *buf, size_t numEntries);
+
+bool tryRelaxPPC64TocIndirection(RelType type, const Relocation &rel,
+ uint8_t *bufLoc);
+unsigned getPPCDFormOp(unsigned secondaryOp);
+
+// In the PowerPC64 Elf V2 abi a function can have 2 entry points. The first
+// is a global entry point (GEP) which typically is used to initialize the TOC
// pointer in general purpose register 2. The second is a local entry
// point (LEP) which bypasses the TOC pointer initialization code. The
// offset between GEP and LEP is encoded in a function's st_other flags.
// This function will return the offset (in bytes) from the global entry-point
// to the local entry-point.
-unsigned getPPC64GlobalEntryToLocalEntryOffset(uint8_t StOther);
+unsigned getPPC64GlobalEntryToLocalEntryOffset(uint8_t stOther);
+
+// Returns true if a relocation is a small code model relocation that accesses
+// the .toc section.
+bool isPPC64SmallCodeModelTocReloc(RelType type);
uint64_t getPPC64TocBase();
-uint64_t getAArch64Page(uint64_t Expr);
+uint64_t getAArch64Page(uint64_t expr);
-extern TargetInfo *Target;
+extern const TargetInfo *target;
TargetInfo *getTarget();
-template <class ELFT> bool isMipsPIC(const Defined *Sym);
+template <class ELFT> bool isMipsPIC(const Defined *sym);
-static inline void reportRangeError(uint8_t *Loc, RelType Type, const Twine &V,
- int64_t Min, uint64_t Max) {
- ErrorPlace ErrPlace = getErrorPlace(Loc);
- StringRef Hint;
- if (ErrPlace.IS && ErrPlace.IS->Name.startswith(".debug"))
- Hint = "; consider recompiling with -fdebug-types-section to reduce size "
+static inline void reportRangeError(uint8_t *loc, RelType type, const Twine &v,
+ int64_t min, uint64_t max) {
+ ErrorPlace errPlace = getErrorPlace(loc);
+ StringRef hint;
+ if (errPlace.isec && errPlace.isec->name.startswith(".debug"))
+ hint = "; consider recompiling with -fdebug-types-section to reduce size "
"of debug sections";
- errorOrWarn(ErrPlace.Loc + "relocation " + lld::toString(Type) +
- " out of range: " + V.str() + " is not in [" + Twine(Min).str() +
- ", " + Twine(Max).str() + "]" + Hint);
-}
-
-inline unsigned getPltEntryOffset(unsigned Idx) {
- return Target->PltHeaderSize + Target->PltEntrySize * Idx;
+ errorOrWarn(errPlace.loc + "relocation " + lld::toString(type) +
+ " out of range: " + v.str() + " is not in [" + Twine(min).str() +
+ ", " + Twine(max).str() + "]" + hint);
}
// Make sure that V can be represented as an N bit signed integer.
-inline void checkInt(uint8_t *Loc, int64_t V, int N, RelType Type) {
- if (V != llvm::SignExtend64(V, N))
- reportRangeError(Loc, Type, Twine(V), llvm::minIntN(N), llvm::maxIntN(N));
+inline void checkInt(uint8_t *loc, int64_t v, int n, RelType type) {
+ if (v != llvm::SignExtend64(v, n))
+ reportRangeError(loc, type, Twine(v), llvm::minIntN(n), llvm::maxIntN(n));
}
// Make sure that V can be represented as an N bit unsigned integer.
-inline void checkUInt(uint8_t *Loc, uint64_t V, int N, RelType Type) {
- if ((V >> N) != 0)
- reportRangeError(Loc, Type, Twine(V), 0, llvm::maxUIntN(N));
+inline void checkUInt(uint8_t *loc, uint64_t v, int n, RelType type) {
+ if ((v >> n) != 0)
+ reportRangeError(loc, type, Twine(v), 0, llvm::maxUIntN(n));
}
// Make sure that V can be represented as an N bit signed or unsigned integer.
-inline void checkIntUInt(uint8_t *Loc, uint64_t V, int N, RelType Type) {
+inline void checkIntUInt(uint8_t *loc, uint64_t v, int n, RelType type) {
// For the error message we should cast V to a signed integer so that error
// messages show a small negative value rather than an extremely large one
- if (V != (uint64_t)llvm::SignExtend64(V, N) && (V >> N) != 0)
- reportRangeError(Loc, Type, Twine((int64_t)V), llvm::minIntN(N),
- llvm::maxIntN(N));
+ if (v != (uint64_t)llvm::SignExtend64(v, n) && (v >> n) != 0)
+ reportRangeError(loc, type, Twine((int64_t)v), llvm::minIntN(n),
+ llvm::maxUIntN(n));
}
-inline void checkAlignment(uint8_t *Loc, uint64_t V, int N, RelType Type) {
- if ((V & (N - 1)) != 0)
- error(getErrorLocation(Loc) + "improper alignment for relocation " +
- lld::toString(Type) + ": 0x" + llvm::utohexstr(V) +
- " is not aligned to " + Twine(N) + " bytes");
+inline void checkAlignment(uint8_t *loc, uint64_t v, int n, RelType type) {
+ if ((v & (n - 1)) != 0)
+ error(getErrorLocation(loc) + "improper alignment for relocation " +
+ lld::toString(type) + ": 0x" + llvm::utohexstr(v) +
+ " is not aligned to " + Twine(n) + " bytes");
}
// Endianness-aware read/write.
-inline uint16_t read16(const void *P) {
- return llvm::support::endian::read16(P, Config->Endianness);
+inline uint16_t read16(const void *p) {
+ return llvm::support::endian::read16(p, config->endianness);
}
-inline uint32_t read32(const void *P) {
- return llvm::support::endian::read32(P, Config->Endianness);
+inline uint32_t read32(const void *p) {
+ return llvm::support::endian::read32(p, config->endianness);
}
-inline uint64_t read64(const void *P) {
- return llvm::support::endian::read64(P, Config->Endianness);
+inline uint64_t read64(const void *p) {
+ return llvm::support::endian::read64(p, config->endianness);
}
-inline void write16(void *P, uint16_t V) {
- llvm::support::endian::write16(P, V, Config->Endianness);
+inline void write16(void *p, uint16_t v) {
+ llvm::support::endian::write16(p, v, config->endianness);
}
-inline void write32(void *P, uint32_t V) {
- llvm::support::endian::write32(P, V, Config->Endianness);
+inline void write32(void *p, uint32_t v) {
+ llvm::support::endian::write32(p, v, config->endianness);
}
-inline void write64(void *P, uint64_t V) {
- llvm::support::endian::write64(P, V, Config->Endianness);
+inline void write64(void *p, uint64_t v) {
+ llvm::support::endian::write64(p, v, config->endianness);
}
} // namespace elf
} // namespace lld
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