lib/Target/XCore/XCoreTargetObjectFile.cpp

   1 //===-- XCoreTargetObjectFile.cpp - XCore object files --------------------===//
   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 #include "XCoreTargetObjectFile.h"
  11 #include "XCoreSubtarget.h"
  12 #include "MCSectionXCore.h"
  13 #include "llvm/Target/TargetMachine.h"
  14 using namespace llvm;
  15
  16
  17 void XCoreTargetObjectFile::Initialize(MCContext &Ctx, const TargetMachine &TM){
  18   TargetLoweringObjectFileELF::Initialize(Ctx, TM);
  19
  20   DataSection =
  21     MCSectionXCore::Create(".dp.data", MCSectionELF::SHT_PROGBITS,
  22                            MCSectionELF::SHF_ALLOC | MCSectionELF::SHF_WRITE |
  23                            MCSectionXCore::SHF_DP_SECTION,
  24                            SectionKind::getDataRel(), false, getContext());
  25   BSSSection =
  26     MCSectionXCore::Create(".dp.bss", MCSectionELF::SHT_NOBITS,
  27                            MCSectionELF::SHF_ALLOC | MCSectionELF::SHF_WRITE |
  28                            MCSectionXCore::SHF_DP_SECTION,
  29                            SectionKind::getBSS(), false, getContext());
  30
  31   MergeableConst4Section =
  32     MCSectionXCore::Create(".cp.rodata.cst4", MCSectionELF::SHT_PROGBITS,
  33                            MCSectionELF::SHF_ALLOC | MCSectionELF::SHF_MERGE |
  34                            MCSectionXCore::SHF_CP_SECTION,
  35                            SectionKind::getMergeableConst4(), false,
  36                            getContext());
  37   MergeableConst8Section =
  38     MCSectionXCore::Create(".cp.rodata.cst8", MCSectionELF::SHT_PROGBITS,
  39                            MCSectionELF::SHF_ALLOC | MCSectionELF::SHF_MERGE |
  40                            MCSectionXCore::SHF_CP_SECTION,
  41                            SectionKind::getMergeableConst8(), false,
  42                            getContext());
  43   MergeableConst16Section =
  44     MCSectionXCore::Create(".cp.rodata.cst16", MCSectionELF::SHT_PROGBITS,
  45                            MCSectionELF::SHF_ALLOC | MCSectionELF::SHF_MERGE |
  46                            MCSectionXCore::SHF_CP_SECTION,
  47                            SectionKind::getMergeableConst16(), false,
  48                            getContext());
  49
  50   // TLS globals are lowered in the backend to arrays indexed by the current
  51   // thread id. After lowering they require no special handling by the linker
  52   // and can be placed in the standard data / bss sections.
  53   TLSDataSection = DataSection;
  54   TLSBSSSection = BSSSection;
  55
  56   if (TM.getSubtarget<XCoreSubtarget>().isXS1A())
  57     ReadOnlySection =   // FIXME: Why is this a writable section for XS1A?
  58       MCSectionXCore::Create(".dp.rodata", MCSectionELF::SHT_PROGBITS,
  59                              MCSectionELF::SHF_ALLOC | MCSectionELF::SHF_WRITE |
  60                              MCSectionXCore::SHF_DP_SECTION,
  61                              SectionKind::getDataRel(), false, getContext());
  62   else
  63     ReadOnlySection =
  64       MCSectionXCore::Create(".cp.rodata", MCSectionELF::SHT_PROGBITS,
  65                              MCSectionELF::SHF_ALLOC |
  66                              MCSectionXCore::SHF_CP_SECTION,
  67                              SectionKind::getReadOnlyWithRel(), false,
  68                              getContext());
  69
  70   // Dynamic linking is not supported. Data with relocations is placed in the
  71   // same section as data without relocations.
  72   DataRelSection = DataRelLocalSection = DataSection;
  73   DataRelROSection = DataRelROLocalSection = ReadOnlySection;
  74 }