/* main.c --- main function for stand-alone RX simulator.

Copyright (C) 2005, 2007, 2008, 2009, 2010, 2011
Free Software Foundation, Inc.
Contributed by Red Hat, Inc.

This file is part of the GNU simulators.

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 "config.h"
#include <stdio.h>
#include <string.h>
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <assert.h>
#include <setjmp.h>
#include <signal.h>
#ifdef HAVE_GETOPT_H
#include <getopt.h>
#endif

#include "bfd.h"

#include "cpu.h"
#include "mem.h"
#include "misc.h"
#include "load.h"
#include "trace.h"
#include "err.h"

static int disassemble = 0;

/* This must be higher than any other option index.  */
#define OPT_ACT 400

#define ACT(E,A) (OPT_ACT + SIM_ERR_##E * SIM_ERRACTION_NUM_ACTIONS + SIM_ERRACTION_##A)

static struct option sim_options[] =
{
  { "end-sim-args", 0, NULL, 'E' },
  { "exit-null-deref", 0, NULL, ACT(NULL_POINTER_DEREFERENCE,EXIT) },
  { "warn-null-deref", 0, NULL, ACT(NULL_POINTER_DEREFERENCE,WARN) },
  { "ignore-null-deref", 0, NULL, ACT(NULL_POINTER_DEREFERENCE,IGNORE) },
  { "exit-unwritten-pages", 0, NULL, ACT(READ_UNWRITTEN_PAGES,EXIT) },
  { "warn-unwritten-pages", 0, NULL, ACT(READ_UNWRITTEN_PAGES,WARN) },
  { "ignore-unwritten-pages", 0, NULL, ACT(READ_UNWRITTEN_PAGES,IGNORE) },
  { "exit-unwritten-bytes", 0, NULL, ACT(READ_UNWRITTEN_BYTES,EXIT) },
  { "warn-unwritten-bytes", 0, NULL, ACT(READ_UNWRITTEN_BYTES,WARN) },
  { "ignore-unwritten-bytes", 0, NULL, ACT(READ_UNWRITTEN_BYTES,IGNORE) },
  { "exit-corrupt-stack", 0, NULL, ACT(CORRUPT_STACK,EXIT) },
  { "warn-corrupt-stack", 0, NULL, ACT(CORRUPT_STACK,WARN) },
  { "ignore-corrupt-stack", 0, NULL, ACT(CORRUPT_STACK,IGNORE) },
  { 0, 0, 0, 0 }
};

static void
done (int exit_code)
{
  if (verbose)
    {
      stack_heap_stats ();
      mem_usage_stats ();
      /* Only use comma separated numbers when being very verbose.
	 Comma separated numbers are hard to parse in awk scripts.  */
      if (verbose > 1)
	printf ("insns: %14s\n", comma (rx_cycles));
      else
	printf ("insns: %u\n", rx_cycles);

      pipeline_stats ();
    }
  exit (exit_code);
}

int
main (int argc, char **argv)
{
  int o;
  int save_trace;
  bfd *prog;
  int rc;

  /* By default, we exit when an execution error occurs.  */
  execution_error_init_standalone ();

  while ((o = getopt_long (argc, argv, "tvdeEwi", sim_options, NULL)) != -1)
    {
      if (o == 'E')
	/* Stop processing the command line. This is so that any remaining
	   words on the command line that look like arguments will be passed
	   on to the program being simulated.  */
	break;

      if (o >= OPT_ACT)
	{
	  int e, a;

	  o -= OPT_ACT;
	  e = o / SIM_ERRACTION_NUM_ACTIONS;
	  a = o % SIM_ERRACTION_NUM_ACTIONS;
	  execution_error_set_action (e, a);
	}
      else switch (o)
	{
	case 't':
	  trace++;
	  break;
	case 'v':
	  verbose++;
	  break;
	case 'd':
	  disassemble++;
	  break;
	case 'e':
	  execution_error_init_standalone ();
	  break;
	case 'w':
	  execution_error_warn_all ();
	  break;
	case 'i':
	  execution_error_ignore_all ();
	  break;
	case '?':
	  {
	    int i;
	    fprintf (stderr,
		     "usage: run [options] program [arguments]\n");
	    fprintf (stderr,
		     "\t-v\t- increase verbosity.\n"
		     "\t-t\t- trace.\n"
		     "\t-d\t- disassemble.\n"
		     "\t-E\t- stop processing sim args\n"
		     "\t-e\t- exit on all execution errors.\n"
		     "\t-w\t- warn (do not exit) on all execution errors.\n"
		     "\t-i\t- ignore all execution errors.\n");
	    for (i=0; sim_options[i].name; i++)
	      fprintf (stderr, "\t--%s\n", sim_options[i].name);
	    exit (1);
	  }
	}
    }

  prog = bfd_openr (argv[optind], 0);
  if (!prog)
    {
      fprintf (stderr, "Can't read %s\n", argv[optind]);
      exit (1);
    }

  if (!bfd_check_format (prog, bfd_object))
    {
      fprintf (stderr, "%s not a rx program\n", argv[optind]);
      exit (1);
    }

  init_regs ();

  rx_in_gdb = 0;
  save_trace = trace;
  trace = 0;
  rx_load (prog);
  trace = save_trace;

  sim_disasm_init (prog);

  enable_counting = verbose;

  rc = setjmp (decode_jmp_buf);

  if (rc == 0)
    {
      if (!trace && !disassemble)
	{
	  /* This will longjmp to the above if an exception
	     happens.  */
	  for (;;)
	    decode_opcode ();
	}
      else
	while (1)
	  {

	    if (trace)
	      printf ("\n");

	    if (disassemble)
	      {
		enable_counting = 0;
		sim_disasm_one ();
		enable_counting = verbose;
	      }

	    rc = decode_opcode ();

	    if (trace)
	      trace_register_changes ();
	  }
    }

  if (RX_HIT_BREAK (rc))
    done (1);
  else if (RX_EXITED (rc))
    done (RX_EXIT_STATUS (rc));
  else if (RX_STOPPED (rc))
    {
      if (verbose)
	printf("Stopped on signal %d\n", RX_STOP_SIG (rc));
      exit(1);
    }
  done (0);
  exit (0);
}
