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