Index: head/contrib/llvm-project/llvm/lib/MC/MCObjectFileInfo.cpp =================================================================== --- head/contrib/llvm-project/llvm/lib/MC/MCObjectFileInfo.cpp +++ head/contrib/llvm-project/llvm/lib/MC/MCObjectFileInfo.cpp @@ -303,9 +303,14 @@ case Triple::mipsel: case Triple::mips64: case Triple::mips64el: - FDECFIEncoding = Ctx->getAsmInfo()->getCodePointerSize() == 4 - ? dwarf::DW_EH_PE_sdata4 - : dwarf::DW_EH_PE_sdata8; + // We cannot use DW_EH_PE_sdata8 for the large PositionIndependent case + // since there is no R_MIPS_PC64 relocation (only a 32-bit version). + if (PositionIndependent && !Large) + FDECFIEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4; + else + FDECFIEncoding = Ctx->getAsmInfo()->getCodePointerSize() == 4 + ? dwarf::DW_EH_PE_sdata4 + : dwarf::DW_EH_PE_sdata8; break; case Triple::ppc64: case Triple::ppc64le: Index: head/contrib/llvm-project/llvm/lib/Object/RelocationResolver.cpp =================================================================== --- head/contrib/llvm-project/llvm/lib/Object/RelocationResolver.cpp +++ head/contrib/llvm-project/llvm/lib/Object/RelocationResolver.cpp @@ -103,6 +103,7 @@ case ELF::R_MIPS_32: case ELF::R_MIPS_64: case ELF::R_MIPS_TLS_DTPREL64: + case ELF::R_MIPS_PC32: return true; default: return false; @@ -117,6 +118,8 @@ return S + getELFAddend(R); case ELF::R_MIPS_TLS_DTPREL64: return S + getELFAddend(R) - 0x8000; + case ELF::R_MIPS_PC32: + return S + getELFAddend(R) - R.getOffset(); default: llvm_unreachable("Invalid relocation type"); } Index: head/contrib/llvm-project/llvm/lib/Target/Mips/MipsISelLowering.cpp =================================================================== --- head/contrib/llvm-project/llvm/lib/Target/Mips/MipsISelLowering.cpp +++ head/contrib/llvm-project/llvm/lib/Target/Mips/MipsISelLowering.cpp @@ -2995,6 +2995,14 @@ StringRef Sym; if (const GlobalAddressSDNode *G = dyn_cast_or_null(TargetAddr)) { + // We must not emit the R_MIPS_JALR relocation against data symbols + // since this will cause run-time crashes if the linker replaces the + // call instruction with a relative branch to the data symbol. + if (!isa(G->getGlobal())) { + LLVM_DEBUG(dbgs() << "Not adding R_MIPS_JALR against data symbol " + << G->getGlobal()->getName() << "\n"); + return; + } Sym = G->getGlobal()->getName(); } else if (const ExternalSymbolSDNode *ES = @@ -3007,6 +3015,7 @@ MachineFunction *MF = MI.getParent()->getParent(); MCSymbol *S = MF->getContext().getOrCreateSymbol(Sym); + LLVM_DEBUG(dbgs() << "Adding R_MIPS_JALR against " << Sym << "\n"); MI.addOperand(MachineOperand::CreateMCSymbol(S, MipsII::MO_JALR)); } }