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 GotBaseSymOff = 0x8000; 33 GotBaseSymInGotPlt = false; 34 } 35 36 RelExpr PPC::getRelExpr(RelType Type, const Symbol &S, 37 const uint8_t *Loc) const { 38 switch (Type) { 39 case R_PPC_REL24: 40 case R_PPC_REL32: 41 return R_PC; 42 case R_PPC_PLTREL24: 43 return R_PLT_PC; 44 default: 45 return R_ABS; 46 } 47 } 48 49 void PPC::relocateOne(uint8_t *Loc, RelType Type, uint64_t Val) const { 50 switch (Type) { 51 case R_PPC_ADDR16_HA: 52 write16be(Loc, (Val + 0x8000) >> 16); 53 break; 54 case R_PPC_ADDR16_HI: 55 write16be(Loc, Val >> 16); 56 break; 57 case R_PPC_ADDR16_LO: 58 write16be(Loc, Val); 59 break; 60 case R_PPC_ADDR32: 61 case R_PPC_REL32: 62 write32be(Loc, Val); 63 break; 64 case R_PPC_PLTREL24: 65 case R_PPC_REL24: 66 write32be(Loc, read32be(Loc) | (Val & 0x3FFFFFC)); 67 break; 68 default: 69 error(getErrorLocation(Loc) + "unrecognized reloc " + Twine(Type)); 70 } 71 } 72 73 TargetInfo *elf::getPPCTargetInfo() { 74 static PPC Target; 75 return &Target; 76 } 77