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.

2 files changed, 7 insertions, 7 deletions

diff --git a/sim/cr16/ChangeLog b/sim/cr16/ChangeLog
index 1a7341d..84e0f8f 100644
--- a/sim/cr16/ChangeLog
+++ b/sim/cr16/ChangeLog
@@ -1,3 +1,8 @@
+2021-05-17  Mike Frysinger  <vapier@gentoo.org>
+
+	* sim-main.h (SIM_HAVE_COMMON_SIM_STATE): Define.
+	(struct sim_state): Delete.
+
 2021-05-16  Mike Frysinger  <vapier@gentoo.org>
 
 	* cr16_sim.h: Delete config.h include.
diff --git a/sim/cr16/sim-main.h b/sim/cr16/sim-main.h
index 639774c..7ea5b1d 100644
--- a/sim/cr16/sim-main.h
+++ b/sim/cr16/sim-main.h
@@ -19,6 +19,8 @@
 #ifndef SIM_MAIN_H
 #define SIM_MAIN_H
 
+#define SIM_HAVE_COMMON_SIM_STATE
+
 #include "sim-basics.h"
 
 typedef long int           word;
@@ -34,11 +36,4 @@ struct _sim_cpu {
   sim_cpu_base base;
 };
 
-struct sim_state {
-
-  sim_cpu *cpu[MAX_NR_PROCESSORS];
-
-  sim_state_base base;
-};
-
 #endif