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      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/Target/TargetData.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.getTargetData()->getPointerSizeInBits() == 64,
     30                         TM.getTargetData()->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     assert(0 && "unsupported ARM relocation type"); break;
     45 
     46   case ARM::reloc_arm_branch: return ELF::R_ARM_CALL; break;
     47   case ARM::reloc_arm_movt:   return ELF::R_ARM_MOVT_ABS; break;
     48   case ARM::reloc_arm_movw:   return ELF::R_ARM_MOVW_ABS_NC; break;
     49   default:
     50     llvm_unreachable("unknown ARM relocation type"); break;
     51   }
     52   return 0;
     53 }
     54 
     55 long int ARMELFWriterInfo::getDefaultAddendForRelTy(unsigned RelTy,
     56                                                     long int Modifier) const {
     57   assert(0 && "ARMELFWriterInfo::getDefaultAddendForRelTy() not implemented");
     58   return 0;
     59 }
     60 
     61 unsigned ARMELFWriterInfo::getRelocationTySize(unsigned RelTy) const {
     62   assert(0 && "ARMELFWriterInfo::getRelocationTySize() not implemented");
     63   return 0;
     64 }
     65 
     66 bool ARMELFWriterInfo::isPCRelativeRel(unsigned RelTy) const {
     67   assert(0 && "ARMELFWriterInfo::isPCRelativeRel() not implemented");
     68   return 1;
     69 }
     70 
     71 unsigned ARMELFWriterInfo::getAbsoluteLabelMachineRelTy() const {
     72   assert(0 &&
     73          "ARMELFWriterInfo::getAbsoluteLabelMachineRelTy() not implemented");
     74   return 0;
     75 }
     76 
     77 long int ARMELFWriterInfo::computeRelocation(unsigned SymOffset,
     78                                              unsigned RelOffset,
     79                                              unsigned RelTy) const {
     80   assert(0 &&
     81          "ARMELFWriterInfo::getAbsoluteLabelMachineRelTy() not implemented");
     82   return 0;
     83 }
     84