1 //===-- SparcELFObjectWriter.cpp - Sparc 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/SparcFixupKinds.h" 10 #include "MCTargetDesc/SparcMCExpr.h" 11 #include "MCTargetDesc/SparcMCTargetDesc.h" 12 #include "llvm/MC/MCELFObjectWriter.h" 13 #include "llvm/MC/MCExpr.h" 14 #include "llvm/MC/MCObjectWriter.h" 15 #include "llvm/MC/MCValue.h" 16 #include "llvm/Support/ErrorHandling.h" 17 18 using namespace llvm; 19 20 namespace { 21 class SparcELFObjectWriter : public MCELFObjectTargetWriter { 22 public: 23 SparcELFObjectWriter(bool Is64Bit, bool IsV8Plus, uint8_t OSABI) 24 : MCELFObjectTargetWriter( 25 Is64Bit, OSABI, 26 Is64Bit ? ELF::EM_SPARCV9 27 : (IsV8Plus ? ELF::EM_SPARC32PLUS : ELF::EM_SPARC), 28 /*HasRelocationAddend*/ true) {} 29 30 ~SparcELFObjectWriter() override = default; 31 32 protected: 33 unsigned getRelocType(MCContext &Ctx, const MCValue &Target, 34 const MCFixup &Fixup, bool IsPCRel) const override; 35 36 bool needsRelocateWithSymbol(const MCValue &Val, const MCSymbol &Sym, 37 unsigned Type) const override; 38 }; 39 } 40 41 unsigned SparcELFObjectWriter::getRelocType(MCContext &Ctx, 42 const MCValue &Target, 43 const MCFixup &Fixup, 44 bool IsPCRel) const { 45 MCFixupKind Kind = Fixup.getKind(); 46 if (Kind >= FirstLiteralRelocationKind) 47 return Kind - FirstLiteralRelocationKind; 48 49 if (const SparcMCExpr *SExpr = dyn_cast<SparcMCExpr>(Fixup.getValue())) { 50 if (SExpr->getKind() == SparcMCExpr::VK_Sparc_R_DISP32) 51 return ELF::R_SPARC_DISP32; 52 } 53 54 if (IsPCRel) { 55 switch(Fixup.getTargetKind()) { 56 default: 57 llvm_unreachable("Unimplemented fixup -> relocation"); 58 case FK_Data_1: return ELF::R_SPARC_DISP8; 59 case FK_Data_2: return ELF::R_SPARC_DISP16; 60 case FK_Data_4: return ELF::R_SPARC_DISP32; 61 case FK_Data_8: return ELF::R_SPARC_DISP64; 62 case Sparc::fixup_sparc_call30: return ELF::R_SPARC_WDISP30; 63 case Sparc::fixup_sparc_br22: return ELF::R_SPARC_WDISP22; 64 case Sparc::fixup_sparc_br19: return ELF::R_SPARC_WDISP19; 65 case Sparc::fixup_sparc_br16: 66 return ELF::R_SPARC_WDISP16; 67 case Sparc::fixup_sparc_pc22: return ELF::R_SPARC_PC22; 68 case Sparc::fixup_sparc_pc10: return ELF::R_SPARC_PC10; 69 case Sparc::fixup_sparc_wplt30: return ELF::R_SPARC_WPLT30; 70 } 71 } 72 73 switch(Fixup.getTargetKind()) { 74 default: 75 llvm_unreachable("Unimplemented fixup -> relocation"); 76 case FK_NONE: return ELF::R_SPARC_NONE; 77 case FK_Data_1: return ELF::R_SPARC_8; 78 case FK_Data_2: return ((Fixup.getOffset() % 2) 79 ? ELF::R_SPARC_UA16 80 : ELF::R_SPARC_16); 81 case FK_Data_4: return ((Fixup.getOffset() % 4) 82 ? ELF::R_SPARC_UA32 83 : ELF::R_SPARC_32); 84 case FK_Data_8: return ((Fixup.getOffset() % 8) 85 ? ELF::R_SPARC_UA64 86 : ELF::R_SPARC_64); 87 case Sparc::fixup_sparc_13: return ELF::R_SPARC_13; 88 case Sparc::fixup_sparc_hi22: return ELF::R_SPARC_HI22; 89 case Sparc::fixup_sparc_lo10: return ELF::R_SPARC_LO10; 90 case Sparc::fixup_sparc_h44: return ELF::R_SPARC_H44; 91 case Sparc::fixup_sparc_m44: return ELF::R_SPARC_M44; 92 case Sparc::fixup_sparc_l44: return ELF::R_SPARC_L44; 93 case Sparc::fixup_sparc_hh: return ELF::R_SPARC_HH22; 94 case Sparc::fixup_sparc_hm: return ELF::R_SPARC_HM10; 95 case Sparc::fixup_sparc_lm: return ELF::R_SPARC_LM22; 96 case Sparc::fixup_sparc_got22: return ELF::R_SPARC_GOT22; 97 case Sparc::fixup_sparc_got10: return ELF::R_SPARC_GOT10; 98 case Sparc::fixup_sparc_got13: return ELF::R_SPARC_GOT13; 99 case Sparc::fixup_sparc_tls_gd_hi22: return ELF::R_SPARC_TLS_GD_HI22; 100 case Sparc::fixup_sparc_tls_gd_lo10: return ELF::R_SPARC_TLS_GD_LO10; 101 case Sparc::fixup_sparc_tls_gd_add: return ELF::R_SPARC_TLS_GD_ADD; 102 case Sparc::fixup_sparc_tls_gd_call: return ELF::R_SPARC_TLS_GD_CALL; 103 case Sparc::fixup_sparc_tls_ldm_hi22: return ELF::R_SPARC_TLS_LDM_HI22; 104 case Sparc::fixup_sparc_tls_ldm_lo10: return ELF::R_SPARC_TLS_LDM_LO10; 105 case Sparc::fixup_sparc_tls_ldm_add: return ELF::R_SPARC_TLS_LDM_ADD; 106 case Sparc::fixup_sparc_tls_ldm_call: return ELF::R_SPARC_TLS_LDM_CALL; 107 case Sparc::fixup_sparc_tls_ldo_hix22: return ELF::R_SPARC_TLS_LDO_HIX22; 108 case Sparc::fixup_sparc_tls_ldo_lox10: return ELF::R_SPARC_TLS_LDO_LOX10; 109 case Sparc::fixup_sparc_tls_ldo_add: return ELF::R_SPARC_TLS_LDO_ADD; 110 case Sparc::fixup_sparc_tls_ie_hi22: return ELF::R_SPARC_TLS_IE_HI22; 111 case Sparc::fixup_sparc_tls_ie_lo10: return ELF::R_SPARC_TLS_IE_LO10; 112 case Sparc::fixup_sparc_tls_ie_ld: return ELF::R_SPARC_TLS_IE_LD; 113 case Sparc::fixup_sparc_tls_ie_ldx: return ELF::R_SPARC_TLS_IE_LDX; 114 case Sparc::fixup_sparc_tls_ie_add: return ELF::R_SPARC_TLS_IE_ADD; 115 case Sparc::fixup_sparc_tls_le_hix22: return ELF::R_SPARC_TLS_LE_HIX22; 116 case Sparc::fixup_sparc_tls_le_lox10: return ELF::R_SPARC_TLS_LE_LOX10; 117 case Sparc::fixup_sparc_hix22: return ELF::R_SPARC_HIX22; 118 case Sparc::fixup_sparc_lox10: return ELF::R_SPARC_LOX10; 119 case Sparc::fixup_sparc_gotdata_hix22: return ELF::R_SPARC_GOTDATA_HIX22; 120 case Sparc::fixup_sparc_gotdata_lox10: return ELF::R_SPARC_GOTDATA_LOX10; 121 case Sparc::fixup_sparc_gotdata_op: return ELF::R_SPARC_GOTDATA_OP; 122 } 123 124 return ELF::R_SPARC_NONE; 125 } 126 127 bool SparcELFObjectWriter::needsRelocateWithSymbol(const MCValue &, 128 const MCSymbol &, 129 unsigned Type) const { 130 switch (Type) { 131 default: 132 return false; 133 134 // All relocations that use a GOT need a symbol, not an offset, as 135 // the offset of the symbol within the section is irrelevant to 136 // where the GOT entry is. Don't need to list all the TLS entries, 137 // as they're all marked as requiring a symbol anyways. 138 case ELF::R_SPARC_GOT10: 139 case ELF::R_SPARC_GOT13: 140 case ELF::R_SPARC_GOT22: 141 case ELF::R_SPARC_GOTDATA_HIX22: 142 case ELF::R_SPARC_GOTDATA_LOX10: 143 case ELF::R_SPARC_GOTDATA_OP_HIX22: 144 case ELF::R_SPARC_GOTDATA_OP_LOX10: 145 return true; 146 } 147 } 148 149 std::unique_ptr<MCObjectTargetWriter> 150 llvm::createSparcELFObjectWriter(bool Is64Bit, bool IsV8Plus, uint8_t OSABI) { 151 return std::make_unique<SparcELFObjectWriter>(Is64Bit, IsV8Plus, OSABI); 152 } 153