diff options
| -rw-r--r-- | lib/Target/X86/X86ISelLowering.cpp | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp index 49f5cde9bc..839eb8a8ab 100644 --- a/lib/Target/X86/X86ISelLowering.cpp +++ b/lib/Target/X86/X86ISelLowering.cpp @@ -794,6 +794,8 @@ SDOperand X86TargetLowering::LowerCCCCallTo(SDOperand Op, SelectionDAG &DAG, InFlag = Chain.getValue(1); } + // ELF / PIC requires GOT in the EBX register before function calls via PLT + // GOT pointer. if (getTargetMachine().getRelocationModel() == Reloc::PIC_ && Subtarget->isPICStyleGOT()) { Chain = DAG.getCopyToReg(Chain, X86::EBX, @@ -825,6 +827,11 @@ SDOperand X86TargetLowering::LowerCCCCallTo(SDOperand Op, SelectionDAG &DAG, for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i) Ops.push_back(DAG.getRegister(RegsToPass[i].first, RegsToPass[i].second.getValueType())); + + // Add an implicit use GOT pointer in EBX. + if (getTargetMachine().getRelocationModel() == Reloc::PIC_ && + Subtarget->isPICStyleGOT()) + Ops.push_back(DAG.getRegister(X86::EBX, getPointerTy())); if (InFlag.Val) Ops.push_back(InFlag); @@ -1788,6 +1795,8 @@ SDOperand X86TargetLowering::LowerFastCCCallTo(SDOperand Op, SelectionDAG &DAG, } else if (ExternalSymbolSDNode *S = dyn_cast<ExternalSymbolSDNode>(Callee)) Callee = DAG.getTargetExternalSymbol(S->getSymbol(), getPointerTy()); + // ELF / PIC requires GOT in the EBX register before function calls via PLT + // GOT pointer. if (getTargetMachine().getRelocationModel() == Reloc::PIC_ && Subtarget->isPICStyleGOT()) { Chain = DAG.getCopyToReg(Chain, X86::EBX, @@ -1809,6 +1818,11 @@ SDOperand X86TargetLowering::LowerFastCCCallTo(SDOperand Op, SelectionDAG &DAG, Ops.push_back(DAG.getRegister(RegsToPass[i].first, RegsToPass[i].second.getValueType())); + // Add an implicit use GOT pointer in EBX. + if (getTargetMachine().getRelocationModel() == Reloc::PIC_ && + Subtarget->isPICStyleGOT()) + Ops.push_back(DAG.getRegister(X86::EBX, getPointerTy())); + if (InFlag.Val) Ops.push_back(InFlag); |