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, 5 insertions, 0 deletions

diff --git a/sim/d10v/ChangeLog b/sim/d10v/ChangeLog
index bce1617..421faeb 100644
--- a/sim/d10v/ChangeLog
+++ b/sim/d10v/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>
 
 	* d10v_sim.h, gencode.c: Delete config.h include.