SPARC: Truncate syscall args and return values appropriately.

2008-12-16 23:06:37 -08:00
parent ab5eeb4b62
commit 02cd18f536
2 changed files with 21 additions and 4 deletions
--- a/src/cpu/simple_thread.hh
+++ b/src/cpu/simple_thread.hh
@@ -385,8 +385,15 @@ class SimpleThread : public ThreadState
    TheISA::IntReg getSyscallArg(int i)
    {
        assert(i < TheISA::NumArgumentRegs);
-        return regs.readIntReg(TheISA::flattenIntIndex(getTC(),
-                    TheISA::ArgumentReg[i]));
+        TheISA::IntReg val = regs.readIntReg(
+                TheISA::flattenIntIndex(getTC(), TheISA::ArgumentReg[i]));
+#if THE_ISA == SPARC_ISA
+        if (bits(this->readMiscRegNoEffect(
+                        SparcISA::MISCREG_PSTATE), 3, 3)) {
+            val = bits(val, 31, 0);
+        }
+#endif
+        return val;
    }

    // used to shift args for indirect syscall