From caf16a99cc70bd9cf4078a7e08d208984a116951 Mon Sep 17 00:00:00 2001
From: Ali Saidi <saidi@eecs.umich.edu>
Date: Tue, 15 Mar 2005 17:31:18 -0500
Subject: [PATCH] during a cache miss in the simple cpu we were  finalizing the
 trace data too early (before the cache miss completed) and therefore writing
 freeded memory after the cache miss completed.

Also removed some spurious setAddr() and setData() calls.

--HG--
extra : convert_revision : 3da82540c69c4c417aba3ed155e167d09431a1b2
---
 cpu/simple_cpu/simple_cpu.cc | 29 ++++++++++-------------------
 1 file changed, 10 insertions(+), 19 deletions(-)

diff --git a/cpu/simple_cpu/simple_cpu.cc b/cpu/simple_cpu/simple_cpu.cc
index 86aeab7d7..6a95a52c2 100644
--- a/cpu/simple_cpu/simple_cpu.cc
+++ b/cpu/simple_cpu/simple_cpu.cc
@@ -393,13 +393,11 @@ template <class T>
 Fault
 SimpleCPU::read(Addr addr, T &data, unsigned flags)
 {
-    if (status() == DcacheMissStall) {
+    if (status() == DcacheMissStall || status() == DcacheMissSwitch) {
         Fault fault = xc->read(memReq,data);
 
         if (traceData) {
             traceData->setAddr(addr);
-            if (fault == No_Fault)
-                traceData->setData(data);
         }
         return fault;
     }
@@ -428,21 +426,11 @@ SimpleCPU::read(Addr addr, T &data, unsigned flags)
             // do functional access
             fault = xc->read(memReq, data);
 
-            if (traceData) {
-                traceData->setAddr(addr);
-                if (fault == No_Fault)
-                    traceData->setData(data);
-            }
         }
     } else if(fault == No_Fault) {
         // do functional access
         fault = xc->read(memReq, data);
 
-        if (traceData) {
-            traceData->setAddr(addr);
-            if (fault == No_Fault)
-                traceData->setData(data);
-        }
     }
 
     if (!dcacheInterface && (memReq->flags & UNCACHEABLE))
@@ -498,11 +486,6 @@ template <class T>
 Fault
 SimpleCPU::write(T data, Addr addr, unsigned flags, uint64_t *res)
 {
-    if (traceData) {
-        traceData->setAddr(addr);
-        traceData->setData(data);
-    }
-
     memReq->reset(addr, sizeof(T), flags);
 
     // translate to physical address
@@ -605,6 +588,8 @@ SimpleCPU::processCacheCompletion()
       case DcacheMissStall:
         if (memReq->cmd.isRead()) {
             curStaticInst->execute(this,traceData);
+            if (traceData)
+                traceData->finalize();
         }
         dcacheStallCycles += curTick - lastDcacheStall;
         _status = Running;
@@ -613,6 +598,8 @@ SimpleCPU::processCacheCompletion()
       case DcacheMissSwitch:
         if (memReq->cmd.isRead()) {
             curStaticInst->execute(this,traceData);
+            if (traceData)
+                traceData->finalize();
         }
         _status = SwitchedOut;
         sampler->signalSwitched();
@@ -785,8 +772,12 @@ SimpleCPU::tick()
             comLoadEventQueue[0]->serviceEvents(numLoad);
         }
 
-        if (traceData)
+        // If we have a dcache miss, then we can't finialize the instruction
+        // trace yet because we want to populate it with the data later
+        if (traceData &&
+                !(status() == DcacheMissStall && memReq->cmd.isRead())) {
             traceData->finalize();
+        }
 
         traceFunctions(xc->regs.pc);
 
-- 
2.30.2