Line data    Source code

       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/BinaryFormat/COFF.h"
      13             : #include "llvm/MC/MCAsmBackend.h"
      14             : #include "llvm/MC/MCExpr.h"
      15             : #include "llvm/MC/MCFixup.h"
      16             : #include "llvm/MC/MCFixupKindInfo.h"
      17             : #include "llvm/MC/MCObjectWriter.h"
      18             : #include "llvm/MC/MCValue.h"
      19             : #include "llvm/MC/MCWinCOFFObjectWriter.h"
      20             : #include "llvm/Support/ErrorHandling.h"
      21             : #include "llvm/Support/raw_ostream.h"
      22             : #include <cassert>
      23             : 
      24             : using namespace llvm;
      25             : 
      26             : namespace {
      27             : 
      28             : class ARMWinCOFFObjectWriter : public MCWinCOFFObjectTargetWriter {
      29             : public:
      30             :   ARMWinCOFFObjectWriter(bool Is64Bit)
      31           0 :     : MCWinCOFFObjectTargetWriter(COFF::IMAGE_FILE_MACHINE_ARMNT) {
      32             :     assert(!Is64Bit && "AArch64 support not yet implemented");
      33             :   }
      34             : 
      35          94 :   ~ARMWinCOFFObjectWriter() override = default;
      36             : 
      37             :   unsigned getRelocType(MCContext &Ctx, const MCValue &Target,
      38             :                         const MCFixup &Fixup, bool IsCrossSection,
      39             :                         const MCAsmBackend &MAB) const override;
      40             : 
      41             :   bool recordRelocation(const MCFixup &) const override;
      42             : };
      43             : 
      44             : } // end anonymous namespace
      45             : 
      46         118 : unsigned ARMWinCOFFObjectWriter::getRelocType(MCContext &Ctx,
      47             :                                               const MCValue &Target,
      48             :                                               const MCFixup &Fixup,
      49             :                                               bool IsCrossSection,
      50             :                                               const MCAsmBackend &MAB) const {
      51             :   assert(getMachine() == COFF::IMAGE_FILE_MACHINE_ARMNT &&
      52             :          "AArch64 support not yet implemented");
      53             : 
      54             :   MCSymbolRefExpr::VariantKind Modifier =
      55         118 :     Target.isAbsolute() ? MCSymbolRefExpr::VK_None : Target.getSymA()->getKind();
      56             : 
      57         118 :   switch (static_cast<unsigned>(Fixup.getKind())) {
      58           1 :   default: {
      59           1 :     const MCFixupKindInfo &Info = MAB.getFixupKindInfo(Fixup.getKind());
      60           2 :     report_fatal_error(Twine("unsupported relocation type: ") + Info.Name);
      61             :   }
      62          24 :   case FK_Data_4:
      63          24 :     switch (Modifier) {
      64             :     case MCSymbolRefExpr::VK_COFF_IMGREL32:
      65             :       return COFF::IMAGE_REL_ARM_ADDR32NB;
      66           3 :     case MCSymbolRefExpr::VK_SECREL:
      67           3 :       return COFF::IMAGE_REL_ARM_SECREL;
      68          18 :     default:
      69          18 :       return COFF::IMAGE_REL_ARM_ADDR32;
      70             :     }
      71             :   case FK_SecRel_2:
      72             :     return COFF::IMAGE_REL_ARM_SECTION;
      73          11 :   case FK_SecRel_4:
      74          11 :     return COFF::IMAGE_REL_ARM_SECREL;
      75          43 :   case ARM::fixup_t2_condbranch:
      76          43 :     return COFF::IMAGE_REL_ARM_BRANCH20T;
      77           6 :   case ARM::fixup_t2_uncondbranch:
      78             :   case ARM::fixup_arm_thumb_bl:
      79           6 :     return COFF::IMAGE_REL_ARM_BRANCH24T;
      80           2 :   case ARM::fixup_arm_thumb_blx:
      81           2 :     return COFF::IMAGE_REL_ARM_BLX23T;
      82          28 :   case ARM::fixup_t2_movw_lo16:
      83             :   case ARM::fixup_t2_movt_hi16:
      84          28 :     return COFF::IMAGE_REL_ARM_MOV32T;
      85             :   }
      86             : }
      87             : 
      88         117 : bool ARMWinCOFFObjectWriter::recordRelocation(const MCFixup &Fixup) const {
      89         117 :   return static_cast<unsigned>(Fixup.getKind()) != ARM::fixup_t2_movt_hi16;
      90             : }
      91             : 
      92             : namespace llvm {
      93             : 
      94             : std::unique_ptr<MCObjectTargetWriter>
      95          95 : createARMWinCOFFObjectWriter(bool Is64Bit) {
      96          95 :   return llvm::make_unique<ARMWinCOFFObjectWriter>(Is64Bit);
      97             : }
      98             : 
      99             : } // end namespace llvm