1 //===- PPC.cpp ------------------------------------------------------------===// 2 // 3 // The LLVM Linker 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 "Symbols.h" 11 #include "Target.h" 12 #include "lld/Common/ErrorHandler.h" 13 #include "llvm/Support/Endian.h" 14 15 using namespace llvm; 16 using namespace llvm::support::endian; 17 using namespace llvm::ELF; 18 using namespace lld; 19 using namespace lld::elf; 20 21 namespace { 22 class PPC final : public TargetInfo { 23 public: 24 PPC(); 25 void relocateOne(uint8_t *Loc, RelType Type, uint64_t Val) const override; 26 RelExpr getRelExpr(RelType Type, const Symbol &S, 27 const uint8_t *Loc) const override; 28 }; 29 } // namespace 30 31 PPC::PPC() { 32 NoneRel = R_PPC_NONE; 33 GotBaseSymOff = 0x8000; 34 GotBaseSymInGotPlt = false; 35 } 36 37 RelExpr PPC::getRelExpr(RelType Type, const Symbol &S, 38 const uint8_t *Loc) const { 39 switch (Type) { 40 case R_PPC_REL24: 41 case R_PPC_REL32: 42 return R_PC; 43 case R_PPC_PLTREL24: 44 return R_PLT_PC; 45 default: 46 return R_ABS; 47 } 48 } 49 50 void PPC::relocateOne(uint8_t *Loc, RelType Type, uint64_t Val) const { 51 switch (Type) { 52 case R_PPC_ADDR16_HA: 53 write16be(Loc, (Val + 0x8000) >> 16); 54 break; 55 case R_PPC_ADDR16_HI: 56 write16be(Loc, Val >> 16); 57 break; 58 case R_PPC_ADDR16_LO: 59 write16be(Loc, Val); 60 break; 61 case R_PPC_ADDR32: 62 case R_PPC_REL32: 63 write32be(Loc, Val); 64 break; 65 case R_PPC_PLTREL24: 66 case R_PPC_REL24: 67 write32be(Loc, read32be(Loc) | (Val & 0x3FFFFFC)); 68 break; 69 default: 70 error(getErrorLocation(Loc) + "unrecognized reloc " + Twine(Type)); 71 } 72 } 73 74 TargetInfo *elf::getPPCTargetInfo() { 75 static PPC Target; 76 return &Target; 77 } 78