diff --git a/src/cpu/o3/sparc/cpu_impl.hh b/src/cpu/o3/sparc/cpu_impl.hh
index 50d980f55..2e398577e 100644
--- a/src/cpu/o3/sparc/cpu_impl.hh
+++ b/src/cpu/o3/sparc/cpu_impl.hh
@@ -272,7 +272,10 @@ SparcO3CPU<Impl>::getSyscallArg(int i, int tid)
 {
     TheISA::IntReg idx = TheISA::flattenIntIndex(this->tcBase(tid),
             SparcISA::ArgumentReg0 + i);
-    return this->readArchIntReg(idx, tid);
+    TheISA::IntReg val = this->readArchIntReg(idx, tid);
+    if (bits(this->readMiscRegNoEffect(SparcISA::MISCREG_PSTATE, tid), 3, 3))
+        val = bits(val, 31, 0);
+    return val;
 }
 
 template <class Impl>