5 files changed, 37 insertions, 0 deletions
diff --git a/llvm/lib/Target/PowerPC/PPCISelLowering.cpp b/llvm/lib/Target/PowerPC/PPCISelLowering.cpp
index 76148f4e7ce..0ae4e5ebd09 100644
--- a/llvm/lib/Target/PowerPC/PPCISelLowering.cpp
+++ b/llvm/lib/Target/PowerPC/PPCISelLowering.cpp
@@ -12013,3 +12013,16 @@ void PPCTargetLowering::insertCopiesSplitCSR(
         .addReg(NewVR);
   }
 }
+
+// Override to enable LOAD_STACK_GUARD lowering on Linux.
+bool PPCTargetLowering::useLoadStackGuardNode() const {
+  if (!Subtarget.isTargetLinux())
+    return TargetLowering::useLoadStackGuardNode();
+  return true;
+}
+
+// Override to disable global variable loading on Linux.
+void PPCTargetLowering::insertSSPDeclarations(Module &M) const {
+  if (!Subtarget.isTargetLinux())
+    return TargetLowering::insertSSPDeclarations(M);
+}
diff --git a/llvm/lib/Target/PowerPC/PPCISelLowering.h b/llvm/lib/Target/PowerPC/PPCISelLowering.h
index 5351b43c683..c097a62712f 100644
--- a/llvm/lib/Target/PowerPC/PPCISelLowering.h
+++ b/llvm/lib/Target/PowerPC/PPCISelLowering.h
@@ -688,6 +688,10 @@ namespace llvm {
     unsigned
     getExceptionSelectorRegister(const Constant *PersonalityFn) const override;
 
+    /// Override to support customized stack guard loading.
+    bool useLoadStackGuardNode() const override;
+    void insertSSPDeclarations(Module &M) const override;
+
   private:
     struct ReuseLoadInfo {
       SDValue Ptr;
diff --git a/llvm/lib/Target/PowerPC/PPCInstrInfo.cpp b/llvm/lib/Target/PowerPC/PPCInstrInfo.cpp
index b6dc00f37b7..9b682dae7a5 100644
--- a/llvm/lib/Target/PowerPC/PPCInstrInfo.cpp
+++ b/llvm/lib/Target/PowerPC/PPCInstrInfo.cpp
@@ -1857,3 +1857,19 @@ PPCInstrInfo::getSerializableBitmaskMachineOperandTargetFlags() const {
   return makeArrayRef(TargetFlags);
 }
 
+bool PPCInstrInfo::expandPostRAPseudo(MachineBasicBlock::iterator MI) const {
+  switch (MI->getOpcode()) {
+  case TargetOpcode::LOAD_STACK_GUARD: {
+    assert(Subtarget.isTargetLinux() &&
+           "Only Linux target is expected to contain LOAD_STACK_GUARD");
+    const int64_t Offset = Subtarget.isPPC64() ? -0x7010 : -0x7008;
+    const unsigned Reg = Subtarget.isPPC64() ? PPC::X13 : PPC::R2;
+    MI->setDesc(get(PPC::LD));
+    MachineInstrBuilder(*MI->getParent()->getParent(), MI)
+        .addImm(Offset)
+        .addReg(Reg);
+    return true;
+  }
+  }
+  return false;
+}
diff --git a/llvm/lib/Target/PowerPC/PPCInstrInfo.h b/llvm/lib/Target/PowerPC/PPCInstrInfo.h
index d916ba5931b..ab9387a38b1 100644
--- a/llvm/lib/Target/PowerPC/PPCInstrInfo.h
+++ b/llvm/lib/Target/PowerPC/PPCInstrInfo.h
@@ -272,6 +272,9 @@ public:
 
   ArrayRef<std::pair<unsigned, const char *>>
   getSerializableBitmaskMachineOperandTargetFlags() const override;
+
+  // Lower pseudo instructions after register allocation.
+  bool expandPostRAPseudo(MachineBasicBlock::iterator MI) const override;
 };
 
 }
diff --git a/llvm/lib/Target/PowerPC/PPCSubtarget.h b/llvm/lib/Target/PowerPC/PPCSubtarget.h
index 722c8a4822d..da7df797095 100644
--- a/llvm/lib/Target/PowerPC/PPCSubtarget.h
+++ b/llvm/lib/Target/PowerPC/PPCSubtarget.h
@@ -286,6 +286,7 @@ public:
 
   bool isTargetELF() const { return TargetTriple.isOSBinFormatELF(); }
   bool isTargetMachO() const { return TargetTriple.isOSBinFormatMachO(); }
+  bool isTargetLinux() const { return TargetTriple.isOSLinux(); }
 
   bool isDarwinABI() const { return isTargetMachO() || isDarwin(); }
   bool isSVR4ABI() const { return !isDarwinABI(); }