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/* Generic simulator resume.

   Copyright (C) 1997, 2007, 2008 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 "sim-main.h"

#include "sim-assert.h"

/* Halt the simulator after just one instruction */

static void

has_stepped (SIM_DESC sd,

             void *data)

{

  ASSERT (STATE_MAGIC (sd) == SIM_MAGIC_NUMBER);

  sim_engine_halt (sd, NULL, NULL, NULL_CIA, sim_stopped, SIM_SIGTRAP);

}

/* Generic resume - assumes the existance of sim_engine_run */

void

sim_resume (SIM_DESC sd,

            int step,

            int siggnal)

{

  sim_engine *engine = STATE_ENGINE (sd);

  jmp_buf buf;

  int jmpval;

  ASSERT (STATE_MAGIC (sd) == SIM_MAGIC_NUMBER);

  /* we only want to be single stepping the simulator once */

  if (engine->stepper != NULL)

    {

      sim_events_deschedule (sd, engine->stepper);

      engine->stepper = NULL;

    }

  if (step)

    engine->stepper = sim_events_schedule (sd, 1, has_stepped, sd);

  sim_module_resume (sd);

  /* run/resume the simulator */

  engine->jmpbuf = &buf;

  jmpval = setjmp (buf);

  if (jmpval == sim_engine_start_jmpval

      || jmpval == sim_engine_restart_jmpval)

    {

      int last_cpu_nr = sim_engine_last_cpu_nr (sd);

      int next_cpu_nr = sim_engine_next_cpu_nr (sd);

      int nr_cpus = sim_engine_nr_cpus (sd);

      int sig_to_deliver;

      sim_events_preprocess (sd, last_cpu_nr >= nr_cpus, next_cpu_nr >= nr_cpus);

      if (next_cpu_nr >= nr_cpus)

        next_cpu_nr = 0;

      /* Only deliver the SIGGNAL [sic] the first time through - don't

         re-deliver any SIGGNAL during a restart.  NOTE: A new local

         variable is used to avoid problems with the automatic

         variable ``siggnal'' being trashed by a long jump.  */

      if (jmpval == sim_engine_start_jmpval)

        sig_to_deliver = siggnal;

      else

        sig_to_deliver = 0;

#ifdef SIM_CPU_EXCEPTION_RESUME

      {

        sim_cpu* cpu = STATE_CPU (sd, next_cpu_nr);

        SIM_CPU_EXCEPTION_RESUME(sd, cpu, sig_to_deliver);

      }

#endif

      sim_engine_run (sd, next_cpu_nr, nr_cpus, sig_to_deliver);

    }

  engine->jmpbuf = NULL;

  sim_module_suspend (sd);

}