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 161