1 //===- AMDGPU.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 "InputFiles.h" 11 #include "Symbols.h" 12 #include "Target.h" 13 #include "lld/Common/ErrorHandler.h" 14 #include "llvm/Object/ELF.h" 15 #include "llvm/Support/Endian.h" 16 17 using namespace llvm; 18 using namespace llvm::object; 19 using namespace llvm::support::endian; 20 using namespace llvm::ELF; 21 using namespace lld; 22 using namespace lld::elf; 23 24 namespace { 25 class AMDGPU final : public TargetInfo { 26 public: 27 AMDGPU(); 28 uint32_t calcEFlags() const override; 29 void relocateOne(uint8_t *Loc, RelType Type, uint64_t Val) const override; 30 RelExpr getRelExpr(RelType Type, const SymbolBody &S, 31 const uint8_t *Loc) const override; 32 }; 33 } // namespace 34 35 AMDGPU::AMDGPU() { 36 RelativeRel = R_AMDGPU_RELATIVE64; 37 GotRel = R_AMDGPU_ABS64; 38 GotEntrySize = 8; 39 } 40 41 static uint32_t getEFlags(InputFile *File) { 42 return cast<ObjFile<ELF64LE>>(File)->getObj().getHeader()->e_flags; 43 } 44 45 uint32_t AMDGPU::calcEFlags() const { 46 assert(!ObjectFiles.empty()); 47 uint32_t Ret = getEFlags(ObjectFiles[0]); 48 49 // Verify that all input files have the same e_flags. 50 for (InputFile *F : makeArrayRef(ObjectFiles).slice(1)) { 51 if (Ret == getEFlags(F)) 52 continue; 53 error("incompatible e_flags: " + toString(F)); 54 return 0; 55 } 56 return Ret; 57 } 58 59 void AMDGPU::relocateOne(uint8_t *Loc, RelType Type, uint64_t Val) const { 60 switch (Type) { 61 case R_AMDGPU_ABS32: 62 case R_AMDGPU_GOTPCREL: 63 case R_AMDGPU_GOTPCREL32_LO: 64 case R_AMDGPU_REL32: 65 case R_AMDGPU_REL32_LO: 66 write32le(Loc, Val); 67 break; 68 case R_AMDGPU_ABS64: 69 write64le(Loc, Val); 70 break; 71 case R_AMDGPU_GOTPCREL32_HI: 72 case R_AMDGPU_REL32_HI: 73 write32le(Loc, Val >> 32); 74 break; 75 default: 76 error(getErrorLocation(Loc) + "unrecognized reloc " + Twine(Type)); 77 } 78 } 79 80 RelExpr AMDGPU::getRelExpr(RelType Type, const SymbolBody &S, 81 const uint8_t *Loc) const { 82 switch (Type) { 83 case R_AMDGPU_ABS32: 84 case R_AMDGPU_ABS64: 85 return R_ABS; 86 case R_AMDGPU_REL32: 87 case R_AMDGPU_REL32_LO: 88 case R_AMDGPU_REL32_HI: 89 return R_PC; 90 case R_AMDGPU_GOTPCREL: 91 case R_AMDGPU_GOTPCREL32_LO: 92 case R_AMDGPU_GOTPCREL32_HI: 93 return R_GOT_PC; 94 default: 95 return R_INVALID; 96 } 97 } 98 99 TargetInfo *elf::getAMDGPUTargetInfo() { 100 static AMDGPU Target; 101 return &Target; 102 } 103