Add support for sampled PC profiling to FullCPU.

Simple text list of symbol (or address) and count
will be dumped to m5prof.<cpu-name> if the cpu's
pc_sample_interval param is set.

SConscript:
    Add cpu/full_cpu/pc_sample_profile.cc
base/callback.hh:
    Add a comment about MakeCallback.
    Fix type in another comment.
base/loader/symtab.cc:
    Revamp findNearestSymbol() to provide addresses of both
    nearest symbols (preceding and following) as well as
    string for former.

    Move global definition of debugSymbolTable here too.
base/loader/symtab.hh:
    Revamp findNearestSymbol() to provide addresses of both
    nearest symbols (preceding and following) as well as
    string for former.

    Move global declaration of debugSymbolTable here too.
cpu/exetrace.cc:
    Use new findNearestSymbol() interface for trace symbols.
kern/linux/linux_system.cc:
sim/system.cc:
    Remove extern of debugSymbolTable (now in symtab.hh)
sim/process.cc:
    Initialize debugSymbolTable if binary has a symbol table.

--HG--
extra : convert_revision : 0b5393dc39c40ac88c953684708f1125da550671

1 files changed, 5 insertions, 2 deletions

diff --git a/base/callback.hh b/base/callback.hh
index 342ab7e0f..cc2a2f429 100644
--- a/base/callback.hh
+++ b/base/callback.hh
@@ -32,7 +32,7 @@
 #include <list>
 
 /**
- * Generic callback class.  This base class provides a virutal process
+ * Generic callback class.  This base class provides a virtual process
  * function that gets called when the callback queue is processed.
  */
 class Callback
@@ -103,6 +103,8 @@ class CallbackQueue
     }
 };
 
+/// Helper template class to turn a simple class member function into
+/// a callback.
 template <class T, void (T::* F)()>
 class MakeCallback : public Callback
 {
@@ -111,8 +113,9 @@ class MakeCallback : public Callback
 
   public:
     MakeCallback(T *o)
-    : object(o)
+        : object(o)
     { }
+
     void process() { (object->*F)(); }
 };