/* Generic simulator halt/restart.
   Copyright (C) 1997, 1998, 2007, 2008, 2009, 2010, 2011
   Free Software Foundation, Inc.
   Contributed by Cygnus Support.

This file is part of GDB, the GNU debugger.

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 3 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, see <http://www.gnu.org/licenses/>.  */

#include <stdio.h>

#include "sim-main.h"
#include "sim-assert.h"

/* Get the run state.
   REASON/SIGRC are the values returned by sim_stop_reason.
   ??? Should each cpu have its own copy?  */

void
sim_engine_get_run_state (SIM_DESC sd, enum sim_stop *reason, int *sigrc)
{
  sim_engine *engine = STATE_ENGINE (sd);
  ASSERT (STATE_MAGIC (sd) == SIM_MAGIC_NUMBER);
  *reason = engine->reason;
  *sigrc = engine->sigrc;
}

/* Set the run state to REASON/SIGRC.
   REASON/SIGRC are the values returned by sim_stop_reason.
   ??? Should each cpu have its own copy?  */

void
sim_engine_set_run_state (SIM_DESC sd, enum sim_stop reason, int sigrc)
{
  sim_engine *engine = STATE_ENGINE (sd);
  ASSERT (STATE_MAGIC (sd) == SIM_MAGIC_NUMBER);
  engine->reason = reason;
  engine->sigrc = sigrc;
}

/* Generic halt */

void
sim_engine_halt (SIM_DESC sd,
		 sim_cpu *last_cpu,
		 sim_cpu *next_cpu, /* NULL - use default */
		 sim_cia cia,
		 enum sim_stop reason,
		 int sigrc)
{
  sim_engine *engine = STATE_ENGINE (sd);
  ASSERT (STATE_MAGIC (sd) == SIM_MAGIC_NUMBER);
  if (engine->jmpbuf != NULL)
    {
      jmp_buf *halt_buf = engine->jmpbuf;
      engine->last_cpu = last_cpu;
      engine->next_cpu = next_cpu;
      engine->reason = reason;
      engine->sigrc = sigrc;

      SIM_ENGINE_HALT_HOOK (sd, last_cpu, cia);

#ifdef SIM_CPU_EXCEPTION_SUSPEND
      if (last_cpu != NULL && reason != sim_exited)
	SIM_CPU_EXCEPTION_SUSPEND (sd, last_cpu, sim_signal_to_host (sd, sigrc));
#endif

      longjmp (*halt_buf, sim_engine_halt_jmpval);
    }
  else
    {
      sim_io_error (sd, "sim_halt - bad long jump");
      abort ();
    }
}


/* Generic restart */

void
sim_engine_restart (SIM_DESC sd,
		    sim_cpu *last_cpu,
		    sim_cpu *next_cpu,
		    sim_cia cia)
{
  sim_engine *engine = STATE_ENGINE (sd);
  ASSERT (STATE_MAGIC (sd) == SIM_MAGIC_NUMBER);
  if (engine->jmpbuf != NULL)
    {
      jmp_buf *halt_buf = engine->jmpbuf;
      engine->last_cpu = last_cpu;
      engine->next_cpu = next_cpu;
      SIM_ENGINE_RESTART_HOOK (sd, last_cpu, cia);
      longjmp (*halt_buf, sim_engine_restart_jmpval);
    }
  else
    sim_io_error (sd, "sim_restart - bad long jump");
}


/* Generic error code */

void
sim_engine_vabort (SIM_DESC sd,
		   sim_cpu *cpu,
		   sim_cia cia,
		   const char *fmt,
		   va_list ap)
{
  ASSERT (sd == NULL || STATE_MAGIC (sd) == SIM_MAGIC_NUMBER);
  if (sd == NULL)
    {
      vfprintf (stderr, fmt, ap);
      fprintf (stderr, "\nQuit\n");
      abort ();
    }
  else if (STATE_ENGINE (sd)->jmpbuf == NULL)
    {
      sim_io_evprintf (sd, fmt, ap);
      sim_io_eprintf (sd, "\n");
      sim_io_error (sd, "Quit Simulator");
      abort ();
    }
  else
    {
      sim_io_evprintf (sd, fmt, ap);
      sim_io_eprintf (sd, "\n");
      sim_engine_halt (sd, cpu, NULL, cia, sim_stopped, SIM_SIGABRT);
    }
}

void
sim_engine_abort (SIM_DESC sd,
		  sim_cpu *cpu,
		  sim_cia cia,
		  const char *fmt,
		  ...)
{
  va_list ap;
  ASSERT (sd == NULL || STATE_MAGIC (sd) == SIM_MAGIC_NUMBER);
  va_start(ap, fmt);
  sim_engine_vabort (sd, cpu, cia, fmt, ap);
  va_end (ap);
}


/* Generic next/last cpu */

int
sim_engine_last_cpu_nr (SIM_DESC sd)
{
  sim_engine *engine = STATE_ENGINE (sd);
  if (engine->last_cpu != NULL)
    return engine->last_cpu - STATE_CPU (sd, 0);
  else
    return MAX_NR_PROCESSORS;
}

int
sim_engine_next_cpu_nr (SIM_DESC sd)
{
  sim_engine *engine = STATE_ENGINE (sd);
  if (engine->next_cpu != NULL)
    return engine->next_cpu - STATE_CPU (sd, 0);
  else
    return sim_engine_last_cpu_nr (sd) + 1;
}

int
sim_engine_nr_cpus (SIM_DESC sd)
{
  sim_engine *engine = STATE_ENGINE (sd);
  return engine->nr_cpus;
}




/* Initialization */

static SIM_RC
sim_engine_init (SIM_DESC sd)
{
  /* initialize the start/stop/resume engine */
  sim_engine *engine = STATE_ENGINE (sd);
  engine->jmpbuf = NULL;
  engine->last_cpu = NULL;
  engine->next_cpu = NULL;
  engine->nr_cpus = MAX_NR_PROCESSORS;
  engine->reason = sim_running;
  engine->sigrc = 0;
  engine->stepper = NULL; /* sim_events_init will clean it up */
  return SIM_RC_OK;
}


SIM_RC
sim_engine_install (SIM_DESC sd)
{
  SIM_ASSERT (STATE_MAGIC (sd) == SIM_MAGIC_NUMBER);
  sim_module_add_init_fn (sd, sim_engine_init);
  return SIM_RC_OK;
}