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/* New version of run front end support for simulators.

   Copyright (C) 1997, 2004, 2007, 2008 Free Software Foundation, Inc.

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 <signal.h>

#include "sim-main.h"

#include "bfd.h"

#ifdef HAVE_ENVIRON

extern char **environ;

#endif

#ifdef HAVE_UNISTD_H

/* For chdir.  */

#include <unistd.h>

#endif

static void usage (void);

extern host_callback default_callback;

static char *myname;

static SIM_DESC sd;

static RETSIGTYPE

cntrl_c (int sig)

{

  if (! sim_stop (sd))

    {

      fprintf (stderr, "Quit!\n");

      exit (1);

    }

}

int

main (int argc, char **argv)

{

  char *name;

  char **prog_argv = NULL;

  struct bfd *prog_bfd;

  enum sim_stop reason;

  int sigrc = 0;

  int single_step = 0;

  RETSIGTYPE (*prev_sigint) ();

  myname = argv[0] + strlen (argv[0]);

  while (myname > argv[0] && myname[-1] != '/')

    --myname;

  /* INTERNAL: When MYNAME is `step', single step the simulator

     instead of allowing it to run free.  The sole purpose of this

     HACK is to allow the sim_resume interface's step argument to be

     tested without having to build/run gdb. */

  if (strlen (myname) > 4 && strcmp (myname - 4, "step") == 0)

    {

      single_step = 1;

    }

  /* Create an instance of the simulator.  */

  default_callback.init (&default_callback);

  sd = sim_open (SIM_OPEN_STANDALONE, &default_callback, NULL, argv);

  if (sd == 0)

    exit (1);

  if (STATE_MAGIC (sd) != SIM_MAGIC_NUMBER)

    {

      fprintf (stderr, "Internal error - bad magic number in simulator struct\n");

      abort ();

    }

  /* We can't set the endianness in the callback structure until

     sim_config is called, which happens in sim_open.  */

  default_callback.target_endian

    = (CURRENT_TARGET_BYTE_ORDER == BIG_ENDIAN

       ? BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE);

  /* Was there a program to run?  */

  prog_argv = STATE_PROG_ARGV (sd);

  prog_bfd = STATE_PROG_BFD (sd);

  if (prog_argv == NULL || *prog_argv == NULL)

    usage ();

  name = *prog_argv;

  /* For simulators that don't open prog during sim_open() */

  if (prog_bfd == NULL)

    {

      prog_bfd = bfd_openr (name, 0);

      if (prog_bfd == NULL)

        {

          fprintf (stderr, "%s: can't open \"%s\": %s\n",

                   myname, name, bfd_errmsg (bfd_get_error ()));

          exit (1);

        }

      if (!bfd_check_format (prog_bfd, bfd_object))

        {

          fprintf (stderr, "%s: \"%s\" is not an object file: %s\n",

                   myname, name, bfd_errmsg (bfd_get_error ()));

          exit (1);

        }

    }

  if (STATE_VERBOSE_P (sd))

    printf ("%s %s\n", myname, name);

  /* Load the program into the simulator.  */

  if (sim_load (sd, name, prog_bfd, 0) == SIM_RC_FAIL)

    exit (1);

  /* Prepare the program for execution.  */

#ifdef HAVE_ENVIRON

  sim_create_inferior (sd, prog_bfd, prog_argv, environ);

#else

  sim_create_inferior (sd, prog_bfd, prog_argv, NULL);

#endif

  /* To accommodate relative file paths, chdir to sysroot now.  We

     mustn't do this until BFD has opened the program, else we wouldn't

     find the executable if it has a relative file path.  */

  if (simulator_sysroot[0] != '\0' && chdir (simulator_sysroot) < 0)

    {

      fprintf (stderr, "%s: can't change directory to \"%s\"\n",

               myname, simulator_sysroot);

      exit (1);

    }

  /* Run/Step the program.  */

  if (single_step)

    {

      do

        {

          prev_sigint = signal (SIGINT, cntrl_c);

          sim_resume (sd, 1/*step*/, 0);

          signal (SIGINT, prev_sigint);

          sim_stop_reason (sd, &reason, &sigrc);

          if ((reason == sim_stopped) &&

              (sigrc == sim_signal_to_host (sd, SIM_SIGINT)))

            break; /* exit on control-C */

        }

      /* remain on breakpoint or signals in oe mode*/

      while (((reason == sim_signalled) &&

              (sigrc == sim_signal_to_host (sd, SIM_SIGTRAP))) ||

             ((reason == sim_stopped) &&

              (STATE_ENVIRONMENT (sd) == OPERATING_ENVIRONMENT)));

    }

  else

    {

      do

        {

#if defined (HAVE_SIGACTION) && defined (SA_RESTART)

          struct sigaction sa, osa;

          sa.sa_handler = cntrl_c;

          sigemptyset (&sa.sa_mask);

          sa.sa_flags = 0;

          sigaction (SIGINT, &sa, &osa);

          prev_sigint = osa.sa_handler;

#else

          prev_sigint = signal (SIGINT, cntrl_c);

#endif

          sim_resume (sd, 0, sigrc);

          signal (SIGINT, prev_sigint);

          sim_stop_reason (sd, &reason, &sigrc);

          if ((reason == sim_stopped) &&

              (sigrc == sim_signal_to_host (sd, SIM_SIGINT)))

            break; /* exit on control-C */

          /* remain on signals in oe mode */

        } while ((reason == sim_stopped) &&

                 (STATE_ENVIRONMENT (sd) == OPERATING_ENVIRONMENT));

    }

  /* Print any stats the simulator collected.  */

  if (STATE_VERBOSE_P (sd))

    sim_info (sd, 0);

  /* Shutdown the simulator.  */

  sim_close (sd, 0);

  /* If reason is sim_exited, then sigrc holds the exit code which we want

     to return.  If reason is sim_stopped or sim_signalled, then sigrc holds

     the signal that the simulator received; we want to return that to

     indicate failure.  */

  /* Why did we stop? */

  switch (reason)

    {

    case sim_signalled:

    case sim_stopped:

      if (sigrc != 0)

        fprintf (stderr, "program stopped with signal %d.\n", sigrc);

      break;

    case sim_exited:

      break;

    default:

      fprintf (stderr, "program in undefined state (%d:%d)\n", reason, sigrc);

      break;

    }

  return sigrc;

}

static void

usage ()

{

  fprintf (stderr, "Usage: %s [options] program [program args]\n", myname);

  fprintf (stderr, "Run `%s --help' for full list of options.\n", myname);

  exit (1);

}