ELF/Arch/AMDGPU.cpp

//===- AMDGPU.cpp ---------------------------------------------------------===//
//
//                             The LLVM Linker
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

#include "Error.h"
#include "InputFiles.h"
#include "Symbols.h"
#include "Target.h"
#include "llvm/Object/ELF.h"
#include "llvm/Support/Endian.h"

using namespace llvm;
using namespace llvm::object;
using namespace llvm::support::endian;
using namespace llvm::ELF;
using namespace lld;
using namespace lld::elf;

namespace {
class AMDGPU final : public TargetInfo {
public:
  AMDGPU();
  void relocateOne(uint8_t *Loc, uint32_t Type, uint64_t Val) const override;
  RelExpr getRelExpr(uint32_t Type, const SymbolBody &S,
                     const uint8_t *Loc) const override;
};
} // namespace

AMDGPU::AMDGPU() {
  RelativeRel = R_AMDGPU_REL64;
  GotRel = R_AMDGPU_ABS64;
  GotEntrySize = 8;
}

void AMDGPU::relocateOne(uint8_t *Loc, uint32_t Type, uint64_t Val) const {
  switch (Type) {
  case R_AMDGPU_ABS32:
  case R_AMDGPU_GOTPCREL:
  case R_AMDGPU_GOTPCREL32_LO:
  case R_AMDGPU_REL32:
  case R_AMDGPU_REL32_LO:
    write32le(Loc, Val);
    break;
  case R_AMDGPU_ABS64:
    write64le(Loc, Val);
    break;
  case R_AMDGPU_GOTPCREL32_HI:
  case R_AMDGPU_REL32_HI:
    write32le(Loc, Val >> 32);
    break;
  default:
    error(getErrorLocation(Loc) + "unrecognized reloc " + Twine(Type));
  }
}

RelExpr AMDGPU::getRelExpr(uint32_t Type, const SymbolBody &S,
                           const uint8_t *Loc) const {
  switch (Type) {
  case R_AMDGPU_ABS32:
  case R_AMDGPU_ABS64:
    return R_ABS;
  case R_AMDGPU_REL32:
  case R_AMDGPU_REL32_LO:
  case R_AMDGPU_REL32_HI:
    return R_PC;
  case R_AMDGPU_GOTPCREL:
  case R_AMDGPU_GOTPCREL32_LO:
  case R_AMDGPU_GOTPCREL32_HI:
    return R_GOT_PC;
  default:
    error(toString(S.File) + ": unknown relocation type: " + toString(Type));
    return R_HINT;
  }
}

TargetInfo *elf::getAMDGPUTargetInfo() {
  static AMDGPU Target;
  return &Target;
}