lib/Target/ARM/MCTargetDesc/ARMWinCOFFObjectWriter.cpp

   1 //===-- ARMWinCOFFObjectWriter.cpp - ARM Windows COFF Object Writer -- C++ -==//
   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 "MCTargetDesc/ARMFixupKinds.h"
  11 #include "llvm/ADT/Twine.h"
  12 #include "llvm/MC/MCAsmBackend.h"
  13 #include "llvm/MC/MCFixup.h"
  14 #include "llvm/MC/MCFixupKindInfo.h"
  15 #include "llvm/MC/MCValue.h"
  16 #include "llvm/MC/MCWinCOFFObjectWriter.h"
  17 #include "llvm/Support/COFF.h"
  18 #include "llvm/Support/Debug.h"
  19
  20 using namespace llvm;
  21
  22 namespace {
  23 class ARMWinCOFFObjectWriter : public MCWinCOFFObjectTargetWriter {
  24 public:
  25   ARMWinCOFFObjectWriter(bool Is64Bit)
  26     : MCWinCOFFObjectTargetWriter(COFF::IMAGE_FILE_MACHINE_ARMNT) {
  27     assert(!Is64Bit && "AArch64 support not yet implemented");
  28   }
  29   ~ARMWinCOFFObjectWriter() override {}
  30
  31   unsigned getRelocType(const MCValue &Target, const MCFixup &Fixup,
  32                         bool IsCrossSection,
  33                         const MCAsmBackend &MAB) const override;
  34
  35   bool recordRelocation(const MCFixup &) const override;
  36 };
  37
  38 unsigned ARMWinCOFFObjectWriter::getRelocType(const MCValue &Target,
  39                                               const MCFixup &Fixup,
  40                                               bool IsCrossSection,
  41                                               const MCAsmBackend &MAB) const {
  42   assert(getMachine() == COFF::IMAGE_FILE_MACHINE_ARMNT &&
  43          "AArch64 support not yet implemented");
  44
  45   MCSymbolRefExpr::VariantKind Modifier =
  46     Target.isAbsolute() ? MCSymbolRefExpr::VK_None : Target.getSymA()->getKind();
  47
  48   switch (static_cast<unsigned>(Fixup.getKind())) {
  49   default: {
  50     const MCFixupKindInfo &Info = MAB.getFixupKindInfo(Fixup.getKind());
  51     report_fatal_error(Twine("unsupported relocation type: ") + Info.Name);
  52   }
  53   case FK_Data_4:
  54     switch (Modifier) {
  55     case MCSymbolRefExpr::VK_COFF_IMGREL32:
  56       return COFF::IMAGE_REL_ARM_ADDR32NB;
  57     case MCSymbolRefExpr::VK_SECREL:
  58       return COFF::IMAGE_REL_ARM_SECREL;
  59     default:
  60       return COFF::IMAGE_REL_ARM_ADDR32;
  61     }
  62   case FK_SecRel_2:
  63     return COFF::IMAGE_REL_ARM_SECTION;
  64   case FK_SecRel_4:
  65     return COFF::IMAGE_REL_ARM_SECREL;
  66   case ARM::fixup_t2_condbranch:
  67     return COFF::IMAGE_REL_ARM_BRANCH20T;
  68   case ARM::fixup_t2_uncondbranch:
  69     return COFF::IMAGE_REL_ARM_BRANCH24T;
  70   case ARM::fixup_arm_thumb_bl:
  71   case ARM::fixup_arm_thumb_blx:
  72     return COFF::IMAGE_REL_ARM_BLX23T;
  73   case ARM::fixup_t2_movw_lo16:
  74   case ARM::fixup_t2_movt_hi16:
  75     return COFF::IMAGE_REL_ARM_MOV32T;
  76   }
  77 }
  78
  79 bool ARMWinCOFFObjectWriter::recordRelocation(const MCFixup &Fixup) const {
  80   return static_cast<unsigned>(Fixup.getKind()) != ARM::fixup_t2_movt_hi16;
  81 }
  82 }
  83
  84 namespace llvm {
  85 MCObjectWriter *createARMWinCOFFObjectWriter(raw_pwrite_stream &OS,
  86                                              bool Is64Bit) {
  87   MCWinCOFFObjectTargetWriter *MOTW = new ARMWinCOFFObjectWriter(Is64Bit);
  88   return createWinCOFFObjectWriter(MOTW, OS);
  89 }
  90 }
  91