cpu: fix exec tracing memory corruption bug

Accessing traceData (to call setAddress() and/or setData())
after initiating a timing translation was causing crashes,
since a failed translation could delete the traceData
object before returning.

It turns out that there was never a need to access traceData
after initiating the translation, as the traced data was
always available earlier; this ordering was merely
historical.  Furthermore, traceData->setAddress() and
traceData->setData() were being called both from the CPU
model and the ISA definition, often redundantly.

This patch standardizes all setAddress and setData calls
for memory instructions to be in the CPU models and not
in the ISA definition.  It also moves those calls above
the translation calls to eliminate the crashes.

1 files changed, 21 insertions, 0 deletions

diff --git a/src/cpu/simple/base.cc b/src/cpu/simple/base.cc
index 0104e1b1f..17ba6a10b 100644
--- a/src/cpu/simple/base.cc
+++ b/src/cpu/simple/base.cc
@@ -205,6 +205,27 @@ change_thread_state(ThreadID tid, int activate, int priority)
 {
 }
 
+void
+BaseSimpleCPU::prefetch(Addr addr, unsigned flags)
+{
+    if (traceData) {
+        traceData->setAddr(addr);
+    }
+
+    // need to do this...
+}
+
+void
+BaseSimpleCPU::writeHint(Addr addr, int size, unsigned flags)
+{
+    if (traceData) {
+        traceData->setAddr(addr);
+    }
+
+    // need to do this...
+}
+
+
 Fault
 BaseSimpleCPU::copySrcTranslate(Addr src)
 {