1 //===-- SparcELFObjectWriter.cpp - Sparc ELF Writer -----------------------===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 10 #include "MCTargetDesc/SparcFixupKinds.h" 11 #include "MCTargetDesc/SparcMCExpr.h" 12 #include "MCTargetDesc/SparcMCTargetDesc.h" 13 #include "llvm/ADT/STLExtras.h" 14 #include "llvm/MC/MCELFObjectWriter.h" 15 #include "llvm/MC/MCExpr.h" 16 #include "llvm/MC/MCObjectWriter.h" 17 #include "llvm/MC/MCValue.h" 18 #include "llvm/Support/ErrorHandling.h" 19 20 using namespace llvm; 21 22 namespace { 23 class SparcELFObjectWriter : public MCELFObjectTargetWriter { 24 public: 25 SparcELFObjectWriter(bool Is64Bit, uint8_t OSABI) 26 : MCELFObjectTargetWriter(Is64Bit, OSABI, 27 Is64Bit ? ELF::EM_SPARCV9 : ELF::EM_SPARC, 28 /*HasRelocationAddend*/ true) {} 29 30 ~SparcELFObjectWriter() override {} 31 32 protected: 33 unsigned getRelocType(MCContext &Ctx, const MCValue &Target, 34 const MCFixup &Fixup, bool IsPCRel) const override; 35 36 bool needsRelocateWithSymbol(const MCSymbol &Sym, 37 unsigned Type) const override; 38 39 }; 40 } 41 42 unsigned SparcELFObjectWriter::getRelocType(MCContext &Ctx, 43 const MCValue &Target, 44 const MCFixup &Fixup, 45 bool IsPCRel) const { 46 47 if (const SparcMCExpr *SExpr = dyn_cast<SparcMCExpr>(Fixup.getValue())) { 48 if (SExpr->getKind() == SparcMCExpr::VK_Sparc_R_DISP32) 49 return ELF::R_SPARC_DISP32; 50 } 51 52 if (IsPCRel) { 53 switch((unsigned)Fixup.getKind()) { 54 default: 55 llvm_unreachable("Unimplemented fixup -> relocation"); 56 case FK_Data_1: return ELF::R_SPARC_DISP8; 57 case FK_Data_2: return ELF::R_SPARC_DISP16; 58 case FK_Data_4: return ELF::R_SPARC_DISP32; 59 case FK_Data_8: return ELF::R_SPARC_DISP64; 60 case Sparc::fixup_sparc_call30: return ELF::R_SPARC_WDISP30; 61 case Sparc::fixup_sparc_br22: return ELF::R_SPARC_WDISP22; 62 case Sparc::fixup_sparc_br19: return ELF::R_SPARC_WDISP19; 63 case Sparc::fixup_sparc_pc22: return ELF::R_SPARC_PC22; 64 case Sparc::fixup_sparc_pc10: return ELF::R_SPARC_PC10; 65 case Sparc::fixup_sparc_wplt30: return ELF::R_SPARC_WPLT30; 66 } 67 } 68 69 switch((unsigned)Fixup.getKind()) { 70 default: 71 llvm_unreachable("Unimplemented fixup -> relocation"); 72 case FK_Data_1: return ELF::R_SPARC_8; 73 case FK_Data_2: return ((Fixup.getOffset() % 2) 74 ? ELF::R_SPARC_UA16 75 : ELF::R_SPARC_16); 76 case FK_Data_4: return ((Fixup.getOffset() % 4) 77 ? ELF::R_SPARC_UA32 78 : ELF::R_SPARC_32); 79 case FK_Data_8: return ((Fixup.getOffset() % 8) 80 ? ELF::R_SPARC_UA64 81 : ELF::R_SPARC_64); 82 case Sparc::fixup_sparc_13: return ELF::R_SPARC_13; 83 case Sparc::fixup_sparc_hi22: return ELF::R_SPARC_HI22; 84 case Sparc::fixup_sparc_lo10: return ELF::R_SPARC_LO10; 85 case Sparc::fixup_sparc_h44: return ELF::R_SPARC_H44; 86 case Sparc::fixup_sparc_m44: return ELF::R_SPARC_M44; 87 case Sparc::fixup_sparc_l44: return ELF::R_SPARC_L44; 88 case Sparc::fixup_sparc_hh: return ELF::R_SPARC_HH22; 89 case Sparc::fixup_sparc_hm: return ELF::R_SPARC_HM10; 90 case Sparc::fixup_sparc_got22: return ELF::R_SPARC_GOT22; 91 case Sparc::fixup_sparc_got10: return ELF::R_SPARC_GOT10; 92 case Sparc::fixup_sparc_got13: return ELF::R_SPARC_GOT13; 93 case Sparc::fixup_sparc_tls_gd_hi22: return ELF::R_SPARC_TLS_GD_HI22; 94 case Sparc::fixup_sparc_tls_gd_lo10: return ELF::R_SPARC_TLS_GD_LO10; 95 case Sparc::fixup_sparc_tls_gd_add: return ELF::R_SPARC_TLS_GD_ADD; 96 case Sparc::fixup_sparc_tls_gd_call: return ELF::R_SPARC_TLS_GD_CALL; 97 case Sparc::fixup_sparc_tls_ldm_hi22: return ELF::R_SPARC_TLS_LDM_HI22; 98 case Sparc::fixup_sparc_tls_ldm_lo10: return ELF::R_SPARC_TLS_LDM_LO10; 99 case Sparc::fixup_sparc_tls_ldm_add: return ELF::R_SPARC_TLS_LDM_ADD; 100 case Sparc::fixup_sparc_tls_ldm_call: return ELF::R_SPARC_TLS_LDM_CALL; 101 case Sparc::fixup_sparc_tls_ldo_hix22: return ELF::R_SPARC_TLS_LDO_HIX22; 102 case Sparc::fixup_sparc_tls_ldo_lox10: return ELF::R_SPARC_TLS_LDO_LOX10; 103 case Sparc::fixup_sparc_tls_ldo_add: return ELF::R_SPARC_TLS_LDO_ADD; 104 case Sparc::fixup_sparc_tls_ie_hi22: return ELF::R_SPARC_TLS_IE_HI22; 105 case Sparc::fixup_sparc_tls_ie_lo10: return ELF::R_SPARC_TLS_IE_LO10; 106 case Sparc::fixup_sparc_tls_ie_ld: return ELF::R_SPARC_TLS_IE_LD; 107 case Sparc::fixup_sparc_tls_ie_ldx: return ELF::R_SPARC_TLS_IE_LDX; 108 case Sparc::fixup_sparc_tls_ie_add: return ELF::R_SPARC_TLS_IE_ADD; 109 case Sparc::fixup_sparc_tls_le_hix22: return ELF::R_SPARC_TLS_LE_HIX22; 110 case Sparc::fixup_sparc_tls_le_lox10: return ELF::R_SPARC_TLS_LE_LOX10; 111 } 112 113 return ELF::R_SPARC_NONE; 114 } 115 116 bool SparcELFObjectWriter::needsRelocateWithSymbol(const MCSymbol &Sym, 117 unsigned Type) const { 118 switch (Type) { 119 default: 120 return false; 121 122 // All relocations that use a GOT need a symbol, not an offset, as 123 // the offset of the symbol within the section is irrelevant to 124 // where the GOT entry is. Don't need to list all the TLS entries, 125 // as they're all marked as requiring a symbol anyways. 126 case ELF::R_SPARC_GOT10: 127 case ELF::R_SPARC_GOT13: 128 case ELF::R_SPARC_GOT22: 129 case ELF::R_SPARC_GOTDATA_HIX22: 130 case ELF::R_SPARC_GOTDATA_LOX10: 131 case ELF::R_SPARC_GOTDATA_OP_HIX22: 132 case ELF::R_SPARC_GOTDATA_OP_LOX10: 133 return true; 134 } 135 } 136 137 std::unique_ptr<MCObjectTargetWriter> 138 llvm::createSparcELFObjectWriter(bool Is64Bit, uint8_t OSABI) { 139 return llvm::make_unique<SparcELFObjectWriter>(Is64Bit, OSABI); 140 } 141
