/* Model support.
   Copyright (C) 1996, 1997, 1998, 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 "libiberty.h"
#include "sim-options.h"
#include "sim-io.h"
#include "sim-assert.h"
#include "bfd.h"

static void model_set (sim_cpu *, const MODEL *);

static DECLARE_OPTION_HANDLER (model_option_handler);

static MODULE_INIT_FN sim_model_init;

#define OPTION_MODEL (OPTION_START + 0)

static const OPTION model_options[] = {
  { {"model", required_argument, NULL, OPTION_MODEL},
      '\0', "MODEL", "Specify model to simulate",
      model_option_handler },
  { {NULL, no_argument, NULL, 0}, '\0', NULL, NULL, NULL }
};

static SIM_RC
model_option_handler (SIM_DESC sd, sim_cpu *cpu, int opt,
		      char *arg, int is_command)
{
  switch (opt)
    {
    case OPTION_MODEL :
      {
	const MODEL *model = sim_model_lookup (arg);
	if (! model)
	  {
	    sim_io_eprintf (sd, "unknown model `%s'\n", arg);
	    return SIM_RC_FAIL;
	  }
	sim_model_set (sd, cpu, model);
	break;
      }
    }

  return SIM_RC_OK;
}

SIM_RC
sim_model_install (SIM_DESC sd)
{
  SIM_ASSERT (STATE_MAGIC (sd) == SIM_MAGIC_NUMBER);

  sim_add_option_table (sd, NULL, model_options);
  sim_module_add_init_fn (sd, sim_model_init);

  return SIM_RC_OK;
}

/* Subroutine of sim_model_set to set the model for one cpu.  */

static void
model_set (sim_cpu *cpu, const MODEL *model)
{
  CPU_MACH (cpu) = MODEL_MACH (model);
  CPU_MODEL (cpu) = model;
  (* MACH_INIT_CPU (MODEL_MACH (model))) (cpu);
  (* MODEL_INIT (model)) (cpu);
}

/* Set the current model of CPU to MODEL.
   If CPU is NULL, all cpus are set to MODEL.  */

void
sim_model_set (SIM_DESC sd, sim_cpu *cpu, const MODEL *model)
{
  if (! cpu)
    {
      int c;

      for (c = 0; c < MAX_NR_PROCESSORS; ++c)
	if (STATE_CPU (sd, c))
	  model_set (STATE_CPU (sd, c), model);
    }
  else
    {
      model_set (cpu, model);
    }
}

/* Look up model named NAME.
   Result is pointer to MODEL entry or NULL if not found.  */

const MODEL *
sim_model_lookup (const char *name)
{
  const MACH **machp;
  const MODEL *model;

  for (machp = & sim_machs[0]; *machp != NULL; ++machp)
    {
      for (model = MACH_MODELS (*machp); MODEL_NAME (model) != NULL; ++model)
	{
	  if (strcmp (MODEL_NAME (model), name) == 0)
	    return model;
	}
    }
  return NULL;
}

/* Look up machine named NAME.
   Result is pointer to MACH entry or NULL if not found.  */

const MACH *
sim_mach_lookup (const char *name)
{
  const MACH **machp;

  for (machp = & sim_machs[0]; *machp != NULL; ++machp)
    {
      if (strcmp (MACH_NAME (*machp), name) == 0)
	return *machp;
    }
  return NULL;
}

/* Look up a machine via its bfd name.
   Result is pointer to MACH entry or NULL if not found.  */

const MACH *
sim_mach_lookup_bfd_name (const char *name)
{
  const MACH **machp;

  for (machp = & sim_machs[0]; *machp != NULL; ++machp)
    {
      if (strcmp (MACH_BFD_NAME (*machp), name) == 0)
	return *machp;
    }
  return NULL;
}

/* Initialize model support.  */

static SIM_RC
sim_model_init (SIM_DESC sd)
{
  SIM_CPU *cpu;

  /* If both cpu model and state architecture are set, ensure they're
     compatible.  If only one is set, set the other.  If neither are set,
     use the default model.  STATE_ARCHITECTURE is the bfd_arch_info data
     for the selected "mach" (bfd terminology).  */

  /* Only check cpu 0.  STATE_ARCHITECTURE is for that one only.  */
  /* ??? At present this only supports homogeneous multiprocessors.  */
  cpu = STATE_CPU (sd, 0);

  if (! STATE_ARCHITECTURE (sd)
      && ! CPU_MACH (cpu))
    {
      /* Set the default model.  */
      const MODEL *model = sim_model_lookup (WITH_DEFAULT_MODEL);
      sim_model_set (sd, NULL, model);
    }

  if (STATE_ARCHITECTURE (sd)
      && CPU_MACH (cpu))
    {
      if (strcmp (STATE_ARCHITECTURE (sd)->printable_name,
		  MACH_BFD_NAME (CPU_MACH (cpu))) != 0)
	{
	  sim_io_eprintf (sd, "invalid model `%s' for `%s'\n",
			  MODEL_NAME (CPU_MODEL (cpu)),
			  STATE_ARCHITECTURE (sd)->printable_name);
	  return SIM_RC_FAIL;
	}
    }
  else if (STATE_ARCHITECTURE (sd))
    {
      /* Use the default model for the selected machine.
	 The default model is the first one in the list.  */
      const MACH *mach = sim_mach_lookup_bfd_name (STATE_ARCHITECTURE (sd)->printable_name);

      if (mach == NULL)
	{
	  sim_io_eprintf (sd, "unsupported machine `%s'\n",
			  STATE_ARCHITECTURE (sd)->printable_name);
	  return SIM_RC_FAIL;
	}
      sim_model_set (sd, NULL, MACH_MODELS (mach));
    }
  else
    {
      STATE_ARCHITECTURE (sd) = bfd_scan_arch (MACH_BFD_NAME (CPU_MACH (cpu)));
    }

  return SIM_RC_OK;
}