sim: move default model to the runtime sim state

This kills off another compile-time option by moving the setting to
the individual arch runtimes.  This will allow dynamic selection by
the arch when doing a single build with multiple arches.

The sim_model_init rework is a little funky.  In the past it was
disabled entirely if no default model was set.  We maintain the
spirit of the logic by gating the fallback logic on whether the
port has defined any models.

1 files changed, 4 insertions, 0 deletions

diff --git a/sim/common/sim-base.h b/sim/common/sim-base.h
index 8eae988eb50..674b2d42308 100644
--- a/sim/common/sim-base.h
+++ b/sim/common/sim-base.h
@@ -147,6 +147,10 @@ struct sim_state {
   const SIM_MACH * const *machs;
 #define STATE_MACHS(sd) ((sd)->machs)
 
+  /* If non-NULL, the model to select for CPUs.  */
+  const char *model_name;
+#define STATE_MODEL_NAME(sd) ((sd)->model_name)
+
   /* In standalone simulator, this is the program's arguments passed
      on the command line.  */
   char **prog_argv;