1 files changed, 16 insertions, 0 deletions
diff --git a/llvm/lib/Target/Sparc/SparcInstrInfo.cpp b/llvm/lib/Target/Sparc/SparcInstrInfo.cpp
index 28b81b608b3..175d4b73d59 100644
--- a/llvm/lib/Target/Sparc/SparcInstrInfo.cpp
+++ b/llvm/lib/Target/Sparc/SparcInstrInfo.cpp
@@ -491,3 +491,19 @@ unsigned SparcInstrInfo::getGlobalBaseReg(MachineFunction *MF) const
   SparcFI->setGlobalBaseReg(GlobalBaseReg);
   return GlobalBaseReg;
 }
+
+bool SparcInstrInfo::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");
+    // offsetof(tcbhead_t, stack_guard) from sysdeps/sparc/nptl/tls.h in glibc.
+    const int64_t Offset = Subtarget.is64Bit() ? 0x28 : 0x14;
+    MI->setDesc(get(Subtarget.is64Bit() ? SP::LDXri : SP::LDri));
+    MachineInstrBuilder(*MI->getParent()->getParent(), MI)
+        .addReg(SP::G7).addImm(Offset);
+    return true;
+  }
+  }
+  return false;
+}