Add support for CPU models to execute the effective

address calculation and memory access portions separately.
Not currently used by any CPU models, but Kevin says he needs this.

Also clean up handling of execution tracing for memory accesses
(move it all into isa_desc and out of CPU models).

Got rid of some ancient unused code too.

arch/alpha/isa_desc:
    Add execute() methods to EAComp and MemAcc portions of memory
    access instructions, to allow CPU models to execute the effective
    address calculation and memory access portions separately.

    Requires the execution context to remember the effective address
    across the two invocations.  Added setEA() and getEA() methods to
    execution context to support this.  A model that does not use the
    split execution model can panic if these methods are called.

    Also added hook to call traceData->setAddr() after EA computation
    on any load or store operation.
arch/isa_parser.py:
    Call traceData->setData() on memory writes (stores).
cpu/simple_cpu/simple_cpu.cc:
    Get rid of unused code.
cpu/simple_cpu/simple_cpu.hh:
    Add (non-functional) setEA() and getEA() methods for new
    split memory access execution support.

--HG--
extra : convert_revision : bc2d2c758c4ca753812b9fa81f21038e55929ff0

2 files changed, 6 insertions, 10 deletions

diff --git a/cpu/simple_cpu/simple_cpu.cc b/cpu/simple_cpu/simple_cpu.cc
index e3cce28ae..f292b25a5 100644
--- a/cpu/simple_cpu/simple_cpu.cc
+++ b/cpu/simple_cpu/simple_cpu.cc
@@ -74,14 +74,6 @@
 
 using namespace std;
 
-template<typename T>
-void
-SimpleCPU::trace_data(T data) {
-    if (traceData) {
-        traceData->setData(data);
-    }
-}
-
 
 SimpleCPU::TickEvent::TickEvent(SimpleCPU *c)
     : Event(&mainEventQueue, CPU_Tick_Pri), cpu(c), multiplier(1)
diff --git a/cpu/simple_cpu/simple_cpu.hh b/cpu/simple_cpu/simple_cpu.hh
index 9b6e2423b..a81d6365b 100644
--- a/cpu/simple_cpu/simple_cpu.hh
+++ b/cpu/simple_cpu/simple_cpu.hh
@@ -102,8 +102,7 @@ class SimpleCPU : public BaseCPU
 
   private:
     Trace::InstRecord *traceData;
-    template<typename T>
-    void trace_data(T data);
+
   public:
     //
     enum Status {
@@ -244,6 +243,11 @@ class SimpleCPU : public BaseCPU
     template <class T>
     Fault write(T data, Addr addr, unsigned flags, uint64_t *res);
 
+    // These functions are only used in CPU models that split
+    // effective address computation from the actual memory access.
+    void setEA(Addr EA) { panic("SimpleCPU::setEA() not implemented\n"); }
+    Addr getEA() 	{ panic("SimpleCPU::getEA() not implemented\n"); }
+
     void prefetch(Addr addr, unsigned flags)
     {
         // need to do this...