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 159 160