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/*  This file is part of the program psim.

    Copyright (C) 1994-1996, Andrew Cagney <cagney@highland.com.au>

    Copyright (C) 1997, Free Software Foundation

    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 2 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, write to the Free Software

    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

    */

#include <stdarg.h>

#include <ctype.h>

#include "bfd.h"

#include "sim-main.h"

#include "sim-utils.h"

#include "sim-options.h"

#ifdef HAVE_STDLIB_H

#include <stdlib.h>

#endif

#ifdef HAVE_STRING_H

#include <string.h>

#else

#ifdef HAVE_STRINGS_H

#include <strings.h>

#endif

#endif

#define SIM_ADDR unsigned

SIM_DESC

sim_open (SIM_OPEN_KIND kind,

          host_callback *callback,

          struct _bfd *abfd,

          char **argv)

{

  char *buf;

  SIM_DESC sd = sim_state_alloc (kind, callback);

  if (sim_pre_argv_init (sd, argv[0]) != SIM_RC_OK)

    return 0;

#define TIC80_MEM_START 0x2000000

#define TIC80_MEM_SIZE 0x100000

  /* main memory */

  asprintf (&buf, "memory region 0x%lx,0x%lx",

            TIC80_MEM_START, TIC80_MEM_SIZE);

  sim_do_command (sd, buf);

  free (buf);

  /* interrupt memory */

  sim_do_command (sd, "memory region 0x1010000,0x1000");

  /* some memory at zero */

  sim_do_command (sd, "memory region 0,0x100000");

  /* getopt will print the error message so we just have to exit if this fails.

     FIXME: Hmmm...  in the case of gdb we need getopt to call

     print_filtered.  */

  if (sim_parse_args (sd, argv) != SIM_RC_OK)

    {

      /* Uninstall the modules to avoid memory leaks,

         file descriptor leaks, etc.  */

      sim_module_uninstall (sd);

      return 0;

    }

  /* check for/establish the a reference program image */

  if (sim_analyze_program (sd,

                           (STATE_PROG_ARGV (sd) != NULL

                            ? *STATE_PROG_ARGV (sd)

                            : NULL),

                           abfd) != SIM_RC_OK)

    {

      sim_module_uninstall (sd);

      return 0;

    }

  /* establish any remaining configuration options */

  if (sim_config (sd) != SIM_RC_OK)

    {

      sim_module_uninstall (sd);

      return 0;

    }

  if (sim_post_argv_init (sd) != SIM_RC_OK)

    {

      /* Uninstall the modules to avoid memory leaks,

         file descriptor leaks, etc.  */

      sim_module_uninstall (sd);

      return 0;

    }

 /* FIXME: for now */

  return sd;

}

void

sim_close (SIM_DESC sd, int quitting)

{

  /* Uninstall the modules to avoid memory leaks,

     file descriptor leaks, etc.  */

  sim_module_uninstall (sd);

}

/* FIXME - these magic numbers need to be moved elsewhere */

#define SP_REGNUM 1             /* Contains address of top of stack */

#define FP_REGNUM 31            /* Contains address of executing stack frame */

#define PC_REGNUM 32            /* Contains program counter (FIXME?) */

#define NPC_REGNUM 33           /* Contains the next program counter (FIXME?) */

#define A0_REGNUM 34            /* Accumulator register 0 */

#define A3_REGNUM 37            /* Accumulator register 1 */

#define R0_REGNUM 0             /* General Purpose Register 0 - for sim */

#define Rn_REGNUM 31            /* Last General Purpose Register - for sim */

#define An_REGNUM A3_REGNUM     /* Last Accumulator register - for sim */

int

sim_fetch_register (SIM_DESC sd, int regnr, unsigned char *buf, int length)

{

  if (regnr == R0_REGNUM)

    memset (buf, 0, sizeof (unsigned32));

  else if (regnr > R0_REGNUM && regnr <= Rn_REGNUM)

    *(unsigned32*)buf = H2T_4 (STATE_CPU (sd, 0)->reg[regnr - R0_REGNUM]);

  else if (regnr == PC_REGNUM)

    *(unsigned32*)buf = H2T_4 (STATE_CPU (sd, 0)->cia.ip);

  else if (regnr == NPC_REGNUM)

    *(unsigned32*)buf = H2T_4 (STATE_CPU (sd, 0)->cia.dp);

  else if (regnr >= A0_REGNUM && regnr <= An_REGNUM)

    *(unsigned64*)buf = H2T_8 (STATE_CPU (sd, 0)->acc[regnr - A0_REGNUM]);

  else

    sim_io_error (sd, "sim_fetch_register - unknown register nr %d", regnr);

  return -1;

}

int

sim_store_register (SIM_DESC sd, int regnr, unsigned char *buf, int length)

{

  if (regnr >= R0_REGNUM && regnr <= Rn_REGNUM)

    STATE_CPU (sd, 0)->reg[regnr - R0_REGNUM] = T2H_4 (*(unsigned32*)buf);

  else if (regnr == PC_REGNUM)

    STATE_CPU (sd, 0)->cia.ip = T2H_4 (*(unsigned32*)buf);

  else if (regnr == NPC_REGNUM)

    STATE_CPU (sd, 0)->cia.dp = T2H_4 (*(unsigned32*)buf);

  else if (regnr >= A0_REGNUM && regnr <= An_REGNUM)

    STATE_CPU (sd, 0)->acc[regnr - A0_REGNUM] = T2H_8 (*(unsigned64*)buf);

  else

    sim_io_error (sd, "sim_store_register - unknown register nr %d", regnr);

  return -1;

}

SIM_RC

sim_create_inferior (SIM_DESC sd,

                     struct _bfd *abfd,

                     char **argv,

                     char **envp)

{

  /* clear all registers */

  memset (&STATE_CPU (sd, 0)->reg, 0, sizeof (STATE_CPU (sd, 0)->reg));

  memset (&STATE_CPU (sd, 0)->acc, 0, sizeof (STATE_CPU (sd, 0)->acc));

  memset (&STATE_CPU (sd, 0)->cr, 0, sizeof (STATE_CPU (sd, 0)->cr));

  STATE_CPU (sd, 0)->is_user_mode = 0;

  memset (&STATE_CPU (sd, 0)->cia, 0, sizeof (STATE_CPU (sd, 0)->cia));

  /* initialize any modules */

  sim_module_init (sd);

  /* set the stack-pointer/program counter */

  if (abfd != NULL)

    STATE_CPU (sd, 0)->cia.ip = bfd_get_start_address (abfd);

  else

    STATE_CPU (sd, 0)->cia.ip = 0;

  STATE_CPU (sd, 0)->cia.dp = (STATE_CPU (sd, 0)->cia.ip

                               + sizeof (instruction_word));

  STATE_CPU (sd, 0)->cr[IE_CR] |= IE_CR_IE;

  STATE_CPU (sd, 0)->reg[1] = TIC80_MEM_START + TIC80_MEM_SIZE - 16;

  return SIM_RC_OK;

}

void

sim_do_command (SIM_DESC sd, char *cmd)

{

  if (sim_args_command (sd, cmd) != SIM_RC_OK)

    sim_io_eprintf (sd, "Unknown command `%s'\n", cmd);

}