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📄 AArch64ErrataFix.cpp(25.49 KB)
📄 AArch64ErrataFix.h(1.35 KB)
📄 ARMErrataFix.cpp(21.67 KB)
📄 ARMErrataFix.h(1.38 KB)
📁 Arch
📄 CallGraphSort.cpp(8.81 KB)
📄 CallGraphSort.h(652 B)
📄 Config.h(10.49 KB)
📄 DWARF.cpp(5.75 KB)
📄 DWARF.h(2.97 KB)
📄 Driver.cpp(80.51 KB)
📄 Driver.h(2.1 KB)
📄 DriverUtils.cpp(8.74 KB)
📄 EhFrame.cpp(5.42 KB)
📄 EhFrame.h(680 B)
📄 ICF.cpp(19.74 KB)
📄 ICF.h(531 B)
📄 InputFiles.cpp(63.74 KB)
📄 InputFiles.h(12.88 KB)
📄 InputSection.cpp(54.78 KB)
📄 InputSection.h(14 KB)
📄 LTO.cpp(12.64 KB)
📄 LTO.h(1.65 KB)
📄 LinkerScript.cpp(44.6 KB)
📄 LinkerScript.h(10.59 KB)
📄 MapFile.cpp(9.1 KB)
📄 MapFile.h(581 B)
📄 MarkLive.cpp(14.18 KB)
📄 MarkLive.h(566 B)
📄 Options.td(27.47 KB)
📄 OutputSections.cpp(19.23 KB)
📄 OutputSections.h(4.73 KB)
📄 README.md(20 B)
📄 Relocations.cpp(81.61 KB)
📄 Relocations.h(5.89 KB)
📄 ScriptLexer.cpp(8.99 KB)
📄 ScriptLexer.h(1.31 KB)
📄 ScriptParser.cpp(48.05 KB)
📄 ScriptParser.h(961 B)
📄 SymbolTable.cpp(9.72 KB)
📄 SymbolTable.h(3.62 KB)
📄 Symbols.cpp(23.27 KB)
📄 Symbols.h(20.34 KB)
📄 SyntheticSections.cpp(134.95 KB)
📄 SyntheticSections.h(40.28 KB)
📄 Target.cpp(5.79 KB)
📄 Target.h(10.89 KB)
📄 Thunks.cpp(35.71 KB)
📄 Thunks.h(2.69 KB)
📄 Writer.cpp(108.98 KB)
📄 Writer.h(1.79 KB)

Editing: Thunks.h

//===- Thunks.h --------------------------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//

#ifndef LLD_ELF_THUNKS_H
#define LLD_ELF_THUNKS_H

#include "Relocations.h"

namespace lld {
namespace elf {
class Defined;
class InputFile;
class Symbol;
class ThunkSection;
// Class to describe an instance of a Thunk.
// A Thunk is a code-sequence inserted by the linker in between a caller and
// the callee. The relocation to the callee is redirected to the Thunk, which
// after executing transfers control to the callee. Typical uses of Thunks
// include transferring control from non-pi to pi and changing state on
// targets like ARM.
//
// Thunks can be created for Defined, Shared and Undefined Symbols.
// Thunks are assigned to synthetic ThunkSections
class Thunk {
public:
  Thunk(Symbol &destination, int64_t addend);
  virtual ~Thunk();

virtual uint32_t size() = 0;
  virtual void writeTo(uint8_t *buf) = 0;

// All Thunks must define at least one symbol, known as the thunk target
  // symbol, so that we can redirect relocations to it. The thunk may define
  // additional symbols, but these are never targets for relocations.
  virtual void addSymbols(ThunkSection &isec) = 0;

void setOffset(uint64_t offset);
  Defined *addSymbol(StringRef name, uint8_t type, uint64_t value,
                     InputSectionBase &section);

// Some Thunks must be placed immediately before their Target as they elide
  // a branch and fall through to the first Symbol in the Target.
  virtual InputSection *getTargetInputSection() const { return nullptr; }

// To reuse a Thunk the InputSection and the relocation must be compatible
  // with it.
  virtual bool isCompatibleWith(const InputSection &,
                                const Relocation &) const {
    return true;
  }

Defined *getThunkTargetSym() const { return syms[0]; }

Symbol &destination;
  int64_t addend;
  llvm::SmallVector<Defined *, 3> syms;
  uint64_t offset = 0;
  // The alignment requirement for this Thunk, defaults to the size of the
  // typical code section alignment.
  uint32_t alignment = 4;
};

// For a Relocation to symbol S create a Thunk to be added to a synthetic
// ThunkSection.
Thunk *addThunk(const InputSection &isec, Relocation &rel);

void writePPC32PltCallStub(uint8_t *buf, uint64_t gotPltVA,
                           const InputFile *file, int64_t addend);
void writePPC64LoadAndBranch(uint8_t *buf, int64_t offset);

} // namespace elf
} // namespace lld

#endif

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