Add a functional port that is used to load the original binaries in FS

SE mode now has a port that goes to whatever toplevel mem object the
CPU sees that does the appropriate translation for syscall emulation

SConscript:
    translating port is a syscall emu only source
arch/alpha/system.cc:
base/loader/object_file.cc:
base/loader/object_file.hh:
    Use the new functional port to write the binaries into memory
cpu/cpu_exec_context.cc:
cpu/cpu_exec_context.hh:
cpu/simple/cpu.cc:
    We aren't always going to be writing straight to memory with syscalls
    support writing to a cache
mem/port.hh:
    Add a simple unidirectional functional port that panics on any incoming requests
mem/translating_port.hh:
    make translating port inherit from the simple port
sim/system.cc:
sim/system.hh:
    Add a functional port that is used to load the original binaries

--HG--
extra : convert_revision : 9096866d0b23e3aceea68394abb76e63c0f8fd8d

cpu/cpu_exec_context.cc

@@ -80,7 +80,7 @@ CPUExecContext::CPUExecContext(BaseCPU *_cpu, int _thread_num, System *_sys,
 }
 #else
 CPUExecContext::CPUExecContext(BaseCPU *_cpu, int _thread_num,
-                         Process *_process, int _asid)
+                         Process *_process, int _asid, MemObject* memobj)
     : _status(ExecContext::Unallocated),
       cpu(_cpu), thread_num(_thread_num), cpu_id(-1), lastActivate(0),
       lastSuspend(0), process(_process), asid(_asid),
@@ -89,7 +89,7 @@ CPUExecContext::CPUExecContext(BaseCPU *_cpu, int _thread_num,
     /* Use this port to for syscall emulation writes to memory. */
     Port *mem_port;
     port = new TranslatingPort(process->pTable, false);
-    mem_port = process->system->physmem->getPort("functional");
+    mem_port = memobj->getPort("functional");
     mem_port->setPeer(port);
     port->setPeer(mem_port);