sim: invert sim_state storage

Currently all ports have to declare sim_state themselves in their
sim-main.h and then embed the common sim_state_base & sim_cpu in it.
This dynamic makes it impossible to share common object code among
multiple ports because the core data structure is always different.

Let's invert this relationship: common code declares sim_state, and
if the port actually needs state on a per-instance basis, it can use
the new arch_data field for it.  Most ports don't actually use it,
so they don't need to declare anything at all.

This is the first in a series of changes: it adds a define to select
between the old & new layouts, then converts all the ports that don't
need custom state over to the new layout.

1 files changed, 2 insertions, 7 deletions

diff --git a/sim/microblaze/sim-main.h b/sim/microblaze/sim-main.h
index 641771a..d69d814 100644
--- a/sim/microblaze/sim-main.h
+++ b/sim/microblaze/sim-main.h
@@ -18,6 +18,8 @@
 #ifndef MICROBLAZE_SIM_MAIN
 #define MICROBLAZE_SIM_MAIN
 
+#define SIM_HAVE_COMMON_SIM_STATE
+
 #include "microblaze.h"
 #include "sim-basics.h"
 #include "sim-base.h"
@@ -48,11 +50,4 @@ struct _sim_cpu {
   sim_cpu_base base;
 };
 
-struct sim_state {
-
-  sim_cpu *cpu[MAX_NR_PROCESSORS];
-
-  sim_state_base base;
-};
-
 #endif /* MICROBLAZE_SIM_MAIN */