Merge ktlim@zizzer.eecs.umich.edu:/bk/m5

into zamp.eecs.umich.edu:/z/ktlim2/m5

--HG--
extra : convert_revision : a58535776cf5a3d17f8d9f65144cdf8db54289aa

1 files changed, 45 insertions, 0 deletions

diff --git a/cpu/beta_cpu/ras.cc b/cpu/beta_cpu/ras.cc
new file mode 100644
index 000000000..23ca45b3a
--- /dev/null
+++ b/cpu/beta_cpu/ras.cc
@@ -0,0 +1,45 @@
+#include "cpu/beta_cpu/ras.hh"
+
+ReturnAddrStack::ReturnAddrStack(unsigned _numEntries)
+    : numEntries(_numEntries), usedEntries(0),
+      tos(0)
+{
+    addrStack = new Addr[numEntries];
+
+    for (int i = 0; i < numEntries; ++i)
+        addrStack[i] = 0;
+}
+
+void
+ReturnAddrStack::push(const Addr &return_addr)
+{
+    incrTos();
+
+    addrStack[tos] = return_addr;
+
+    if (usedEntries != numEntries) {
+        ++usedEntries;
+    }
+}
+
+void
+ReturnAddrStack::pop()
+{
+    // Not sure it's possible to really track usedEntries properly.
+//    assert(usedEntries > 0);
+
+    if (usedEntries > 0) {
+        --usedEntries;
+    }
+
+    decrTos();
+}
+
+void
+ReturnAddrStack::restore(unsigned top_entry_idx,
+                         const Addr &restored_target)
+{
+    tos = top_entry_idx;
+
+    addrStack[tos] = restored_target;
+}