llvm/lib/Target/AVR/MCTargetDesc/AVRELFObjectWriter.cpp

   1 //===-- AVRELFObjectWriter.cpp - AVR ELF Writer ---------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #include "MCTargetDesc/AVRFixupKinds.h"
  10 #include "MCTargetDesc/AVRMCExpr.h"
  11 #include "MCTargetDesc/AVRMCTargetDesc.h"
  12
  13 #include "llvm/MC/MCAssembler.h"
  14 #include "llvm/MC/MCELFObjectWriter.h"
  15 #include "llvm/MC/MCExpr.h"
  16 #include "llvm/MC/MCObjectWriter.h"
  17 #include "llvm/MC/MCSection.h"
  18 #include "llvm/MC/MCValue.h"
  19 #include "llvm/Support/ErrorHandling.h"
  20
  21 namespace llvm {
  22
  23 /// Writes AVR machine code into an ELF32 object file.
  24 class AVRELFObjectWriter : public MCELFObjectTargetWriter {
  25 public:
  26   AVRELFObjectWriter(uint8_t OSABI);
  27
  28   virtual ~AVRELFObjectWriter() = default;
  29
  30   unsigned getRelocType(MCContext &Ctx, const MCValue &Target,
  31                         const MCFixup &Fixup, bool IsPCRel) const override;
  32 };
  33
  34 AVRELFObjectWriter::AVRELFObjectWriter(uint8_t OSABI)
  35     : MCELFObjectTargetWriter(false, OSABI, ELF::EM_AVR, true) {}
  36
  37 unsigned AVRELFObjectWriter::getRelocType(MCContext &Ctx, const MCValue &Target,
  38                                           const MCFixup &Fixup,
  39                                           bool IsPCRel) const {
  40   const unsigned Kind = Fixup.getTargetKind();
  41   if (Kind >= FirstLiteralRelocationKind)
  42     return Kind - FirstLiteralRelocationKind;
  43   MCSymbolRefExpr::VariantKind Modifier = Target.getAccessVariant();
  44   switch ((unsigned)Fixup.getKind()) {
  45   case FK_Data_1:
  46     switch (Modifier) {
  47     default:
  48       llvm_unreachable("Unsupported Modifier");
  49     case MCSymbolRefExpr::VK_None:
  50       return ELF::R_AVR_8;
  51     case MCSymbolRefExpr::VK_AVR_DIFF8:
  52       return ELF::R_AVR_DIFF8;
  53     case MCSymbolRefExpr::VK_AVR_LO8:
  54       return ELF::R_AVR_8_LO8;
  55     case MCSymbolRefExpr::VK_AVR_HI8:
  56       return ELF::R_AVR_8_HI8;
  57     case MCSymbolRefExpr::VK_AVR_HLO8:
  58       return ELF::R_AVR_8_HLO8;
  59     }
  60   case FK_Data_4:
  61     switch (Modifier) {
  62     default:
  63       llvm_unreachable("Unsupported Modifier");
  64     case MCSymbolRefExpr::VK_None:
  65       return ELF::R_AVR_32;
  66     case MCSymbolRefExpr::VK_AVR_DIFF32:
  67       return ELF::R_AVR_DIFF32;
  68     }
  69   case FK_Data_2:
  70     switch (Modifier) {
  71     default:
  72       llvm_unreachable("Unsupported Modifier");
  73     case MCSymbolRefExpr::VK_None:
  74       return ELF::R_AVR_16;
  75     case MCSymbolRefExpr::VK_AVR_NONE:
  76     case MCSymbolRefExpr::VK_AVR_PM:
  77       return ELF::R_AVR_16_PM;
  78     case MCSymbolRefExpr::VK_AVR_DIFF16:
  79       return ELF::R_AVR_DIFF16;
  80     }
  81   case AVR::fixup_32:
  82     return ELF::R_AVR_32;
  83   case AVR::fixup_7_pcrel:
  84     return ELF::R_AVR_7_PCREL;
  85   case AVR::fixup_13_pcrel:
  86     return ELF::R_AVR_13_PCREL;
  87   case AVR::fixup_16:
  88     return ELF::R_AVR_16;
  89   case AVR::fixup_16_pm:
  90     return ELF::R_AVR_16_PM;
  91   case AVR::fixup_lo8_ldi:
  92     return ELF::R_AVR_LO8_LDI;
  93   case AVR::fixup_hi8_ldi:
  94     return ELF::R_AVR_HI8_LDI;
  95   case AVR::fixup_hh8_ldi:
  96     return ELF::R_AVR_HH8_LDI;
  97   case AVR::fixup_lo8_ldi_neg:
  98     return ELF::R_AVR_LO8_LDI_NEG;
  99   case AVR::fixup_hi8_ldi_neg:
 100     return ELF::R_AVR_HI8_LDI_NEG;
 101   case AVR::fixup_hh8_ldi_neg:
 102     return ELF::R_AVR_HH8_LDI_NEG;
 103   case AVR::fixup_lo8_ldi_pm:
 104     return ELF::R_AVR_LO8_LDI_PM;
 105   case AVR::fixup_hi8_ldi_pm:
 106     return ELF::R_AVR_HI8_LDI_PM;
 107   case AVR::fixup_hh8_ldi_pm:
 108     return ELF::R_AVR_HH8_LDI_PM;
 109   case AVR::fixup_lo8_ldi_pm_neg:
 110     return ELF::R_AVR_LO8_LDI_PM_NEG;
 111   case AVR::fixup_hi8_ldi_pm_neg:
 112     return ELF::R_AVR_HI8_LDI_PM_NEG;
 113   case AVR::fixup_hh8_ldi_pm_neg:
 114     return ELF::R_AVR_HH8_LDI_PM_NEG;
 115   case AVR::fixup_call:
 116     return ELF::R_AVR_CALL;
 117   case AVR::fixup_ldi:
 118     return ELF::R_AVR_LDI;
 119   case AVR::fixup_6:
 120     return ELF::R_AVR_6;
 121   case AVR::fixup_6_adiw:
 122     return ELF::R_AVR_6_ADIW;
 123   case AVR::fixup_ms8_ldi:
 124     return ELF::R_AVR_MS8_LDI;
 125   case AVR::fixup_ms8_ldi_neg:
 126     return ELF::R_AVR_MS8_LDI_NEG;
 127   case AVR::fixup_lo8_ldi_gs:
 128     return ELF::R_AVR_LO8_LDI_GS;
 129   case AVR::fixup_hi8_ldi_gs:
 130     return ELF::R_AVR_HI8_LDI_GS;
 131   case AVR::fixup_8:
 132     return ELF::R_AVR_8;
 133   case AVR::fixup_8_lo8:
 134     return ELF::R_AVR_8_LO8;
 135   case AVR::fixup_8_hi8:
 136     return ELF::R_AVR_8_HI8;
 137   case AVR::fixup_8_hlo8:
 138     return ELF::R_AVR_8_HLO8;
 139   case AVR::fixup_diff8:
 140     return ELF::R_AVR_DIFF8;
 141   case AVR::fixup_diff16:
 142     return ELF::R_AVR_DIFF16;
 143   case AVR::fixup_diff32:
 144     return ELF::R_AVR_DIFF32;
 145   case AVR::fixup_lds_sts_16:
 146     return ELF::R_AVR_LDS_STS_16;
 147   case AVR::fixup_port6:
 148     return ELF::R_AVR_PORT6;
 149   case AVR::fixup_port5:
 150     return ELF::R_AVR_PORT5;
 151   default:
 152     llvm_unreachable("invalid fixup kind!");
 153   }
 154 }
 155
 156 std::unique_ptr<MCObjectTargetWriter> createAVRELFObjectWriter(uint8_t OSABI) {
 157   return std::make_unique<AVRELFObjectWriter>(OSABI);
 158 }
 159
 160 } // end of namespace llvm