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() { GotBaseSymOff = 0x8000; } 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 RelExpr PPC::getRelExpr(RelType Type, const Symbol &S, 32 const uint8_t *Loc) const { 33 switch (Type) { 34 case R_PPC_REL24: 35 case R_PPC_REL32: 36 return R_PC; 37 case R_PPC_PLTREL24: 38 return R_PLT_PC; 39 default: 40 return R_ABS; 41 } 42 } 43 44 void PPC::relocateOne(uint8_t *Loc, RelType Type, uint64_t Val) const { 45 switch (Type) { 46 case R_PPC_ADDR16_HA: 47 write16be(Loc, (Val + 0x8000) >> 16); 48 break; 49 case R_PPC_ADDR16_HI: 50 write16be(Loc, Val >> 16); 51 break; 52 case R_PPC_ADDR16_LO: 53 write16be(Loc, Val); 54 break; 55 case R_PPC_ADDR32: 56 case R_PPC_REL32: 57 write32be(Loc, Val); 58 break; 59 case R_PPC_PLTREL24: 60 case R_PPC_REL24: 61 write32be(Loc, read32be(Loc) | (Val & 0x3FFFFFC)); 62 break; 63 default: 64 error(getErrorLocation(Loc) + "unrecognized reloc " + Twine(Type)); 65 } 66 } 67 68 TargetInfo *elf::getPPCTargetInfo() { 69 static PPC Target; 70 return &Target; 71 } 72