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, 2 insertions, 10 deletions

diff --git a/src/cpu/simple/base.hh b/src/cpu/simple/base.hh
index 39961fb88..87e211521 100644
--- a/src/cpu/simple/base.hh
+++ b/src/cpu/simple/base.hh
@@ -232,16 +232,8 @@ class BaseSimpleCPU : public BaseCPU
     Addr getEA()        { panic("BaseSimpleCPU::getEA() not implemented\n");
         M5_DUMMY_RETURN}
 
-    void prefetch(Addr addr, unsigned flags)
-    {
-        // need to do this...
-    }
-
-    void writeHint(Addr addr, int size, unsigned flags)
-    {
-        // need to do this...
-    }
-
+    void prefetch(Addr addr, unsigned flags);
+    void writeHint(Addr addr, int size, unsigned flags);
 
     Fault copySrcTranslate(Addr src);