lib/Target/ARM/ARMELFWriterInfo.cpp

   1 //===-- ARMELFWriterInfo.cpp - ELF Writer Info for the ARM backend --------===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 //
  10 // This file implements ELF writer information for the ARM backend.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "ARMELFWriterInfo.h"
  15 #include "ARMRelocations.h"
  16 #include "llvm/Function.h"
  17 #include "llvm/Support/ErrorHandling.h"
  18 #include "llvm/DataLayout.h"
  19 #include "llvm/Target/TargetMachine.h"
  20 #include "llvm/Support/ELF.h"
  21
  22 using namespace llvm;
  23
  24 //===----------------------------------------------------------------------===//
  25 //  Implementation of the ARMELFWriterInfo class
  26 //===----------------------------------------------------------------------===//
  27
  28 ARMELFWriterInfo::ARMELFWriterInfo(TargetMachine &TM)
  29   : TargetELFWriterInfo(TM.getDataLayout()->getPointerSizeInBits(0) == 64,
  30                         TM.getDataLayout()->isLittleEndian()) {
  31 }
  32
  33 ARMELFWriterInfo::~ARMELFWriterInfo() {}
  34
  35 unsigned ARMELFWriterInfo::getRelocationType(unsigned MachineRelTy) const {
  36   switch (MachineRelTy) {
  37   case ARM::reloc_arm_absolute:
  38   case ARM::reloc_arm_relative:
  39   case ARM::reloc_arm_cp_entry:
  40   case ARM::reloc_arm_vfp_cp_entry:
  41   case ARM::reloc_arm_machine_cp_entry:
  42   case ARM::reloc_arm_jt_base:
  43   case ARM::reloc_arm_pic_jt:
  44     llvm_unreachable("unsupported ARM relocation type");
  45
  46   case ARM::reloc_arm_branch: return ELF::R_ARM_CALL;
  47   case ARM::reloc_arm_movt:   return ELF::R_ARM_MOVT_ABS;
  48   case ARM::reloc_arm_movw:   return ELF::R_ARM_MOVW_ABS_NC;
  49   default:
  50     llvm_unreachable("unknown ARM relocation type");
  51   }
  52 }
  53
  54 long int ARMELFWriterInfo::getDefaultAddendForRelTy(unsigned RelTy,
  55                                                     long int Modifier) const {
  56   llvm_unreachable("ARMELFWriterInfo::getDefaultAddendForRelTy() not "
  57                    "implemented");
  58 }
  59
  60 unsigned ARMELFWriterInfo::getRelocationTySize(unsigned RelTy) const {
  61   llvm_unreachable("ARMELFWriterInfo::getRelocationTySize() not implemented");
  62 }
  63
  64 bool ARMELFWriterInfo::isPCRelativeRel(unsigned RelTy) const {
  65   llvm_unreachable("ARMELFWriterInfo::isPCRelativeRel() not implemented");
  66 }
  67
  68 unsigned ARMELFWriterInfo::getAbsoluteLabelMachineRelTy() const {
  69   llvm_unreachable("ARMELFWriterInfo::getAbsoluteLabelMachineRelTy() not "
  70                    "implemented");
  71 }
  72
  73 long int ARMELFWriterInfo::computeRelocation(unsigned SymOffset,
  74                                              unsigned RelOffset,
  75                                              unsigned RelTy) const {
  76   llvm_unreachable("ARMELFWriterInfo::getAbsoluteLabelMachineRelTy() not "
  77                    "implemented");
  78 }