TIc80 simulator checkpoint - runs 3 instructions - trap, addu, br.a.

1 files changed, 117 insertions, 0 deletions

diff --git a/sim/tic80/interp.c b/sim/tic80/interp.c
new file mode 100644
index 0000000..5845e06
--- /dev/null
+++ b/sim/tic80/interp.c
@@ -0,0 +1,117 @@
+/*  This file is part of the GDB simulators.
+
+    Copyright (C) 1997, Free Software Foundation
+    Condtributed by Cyngnus Solutions.
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+ 
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ 
+    */
+
+
+
+#include "sim-main.h"
+
+#include "idecode.h"
+
+#include <signal.h>
+
+void
+engine_init (SIM_DESC sd)
+{
+  memset (&STATE_CPU (sd, 0)->reg, 0, sizeof STATE_CPU (sd, 0)->reg);
+  memset (&STATE_CPU (sd, 0)->cia, 0, sizeof STATE_CPU (sd, 0)->cia);
+  CPU_STATE (STATE_CPU (sd, 0)) = sd;
+}
+
+
+/* Mechanisms for stopping/restarting the simulation */
+
+void
+engine_error (SIM_DESC sd,
+	      instruction_address cia,
+	      const char *fmt,
+	      ...)
+{
+  va_list ap;
+  va_start (ap, fmt);
+  sim_io_evprintf (sd, fmt, ap);
+  va_end (ap);
+
+  if (sd->halt_ok)
+    {
+      sim_io_printf (sd, "\n");
+      engine_halt (sd, cia, sim_signalled, SIGABRT);
+    }
+  else
+    sim_io_error (sd, " - aborting simulation");
+}
+
+void
+engine_halt (SIM_DESC sd,
+	     instruction_address cia,
+	     enum sim_stop reason,
+	     int siggnal)
+{
+  if (!sd->halt_ok)
+    sim_io_error (sd, "engine_halt - bad longjmp");
+  sd->reason = reason;
+  sd->siggnal = siggnal;
+  sd->halt_ok = 0;
+  sd->restart_ok = 0;
+  sd->cpu.cia = cia;
+  longjmp (sd->path_to_halt, 1);
+}
+
+void
+engine_restart (SIM_DESC sd,
+		instruction_address cia)
+{
+  if (!sd->restart_ok)
+    sim_io_error (sd, "engine_restart - bad longjmp");
+  sd->restart_ok = 0;
+  sd->cpu.cia = cia;
+  longjmp(sd->path_to_restart, 1);
+}
+
+
+void
+engine_run_until_stop (SIM_DESC sd,
+		       volatile int *keep_running)
+{
+  if (!setjmp (sd->path_to_halt))
+    {
+      instruction_address cia;
+      sd->halt_ok = 1;
+      setjmp (sd->path_to_restart);
+      sd->restart_ok = 1;
+      cia = STATE_CPU (sd, 0)->cia;
+      do
+	{
+	  if (cia.ip == -1)
+	    {
+	      /* anulled instruction */
+	      cia.ip = cia.dp;
+	      cia.dp = cia.dp + sizeof (instruction_word);
+	    }
+	  else
+	    {
+	      instruction_word insn = IMEM (cia.ip);
+	      cia = idecode_issue (sd, insn, cia);
+	    }
+	}
+      while (*keep_running);
+      engine_halt (sd, cia, sim_stopped, SIGINT);
+    }
+}