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/* gdb->simulator interface.

   Copyright (C) 1992, 1993, 1994, 1997 Free Software Foundation, Inc.

This file is part of Z8KSIM

Z8KSIM 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, or (at your option)

any later version.

Z8KSIM 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 Z8KZIM; if not, write to the Free Software

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

#include "ansidecl.h"

#include "sim.h"

#include "tm.h"

#include "signal.h"

#include "bfd.h"

#include "gdb/callback.h"

#include "gdb/remote-sim.h"

#ifndef NULL

#define NULL 0

#endif

host_callback *z8k_callback;

static SIM_OPEN_KIND sim_kind;

static char *myname;

void

sim_size (n)

     int n;

{

  /* Size is fixed.  */

}

int

sim_store_register (sd, regno, value, length)

     SIM_DESC sd;

     int regno;

     unsigned char *value;

     int length;

{

  /* FIXME: Review the computation of regval.  */

  int regval = (value[0] << 24) | (value[1] << 16) | (value[2] << 8) | value[3];

  tm_store_register (regno, regval);

  return -1;

}

int

sim_fetch_register (sd, regno, buf, length)

     SIM_DESC sd;

     int regno;

     unsigned char *buf;

     int length;

{

  tm_fetch_register (regno, buf);

  return -1;

}

int

sim_write (sd, where, what, howmuch)

     SIM_DESC sd;

     SIM_ADDR where;

     unsigned char *what;

     int howmuch;

{

  int i;

  for (i = 0; i < howmuch; i++)

    tm_write_byte (where + i, what[i]);

  return howmuch;

}

int

sim_read (sd, where, what, howmuch)

     SIM_DESC sd;

     SIM_ADDR where;

     unsigned char *what;

     int howmuch;

{

  int i;

  for (i = 0; i < howmuch; i++)

    what[i] = tm_read_byte (where + i);

  return howmuch;

}

static void

control_c (sig, code, scp, addr)

     int sig;

     int code;

     char *scp;

     char *addr;

{

  tm_exception (SIM_INTERRUPT);

}

int

sim_stop (sd)

     SIM_DESC sd;

{

  tm_exception (SIM_INTERRUPT);

  return 1;

}

void

sim_resume (sd, step, sig)

     SIM_DESC sd;

     int step;

     int sig;

{

  void (*prev) ();

  prev = signal (SIGINT, control_c);

  tm_resume (step);

  signal (SIGINT, prev);

}

void

sim_stop_reason (sd, reason, sigrc)

     SIM_DESC sd;

     enum sim_stop *reason;

     int *sigrc;

{

  switch (tm_signal ())

    {

    case SIM_DIV_ZERO:

      *sigrc = SIGFPE;

      break;

    case SIM_INTERRUPT:

      *sigrc = SIGINT;

      break;

    case SIM_BAD_INST:

      *sigrc = SIGILL;

      break;

    case SIM_BREAKPOINT:

      *sigrc = SIGTRAP;

      break;

    case SIM_SINGLE_STEP:

      *sigrc = SIGTRAP;

      break;

    case SIM_BAD_SYSCALL:

      *sigrc = SIGILL;

      break;

    case SIM_BAD_ALIGN:

      *sigrc = SIGSEGV;

      break;

    case SIM_DONE:

      {

        sim_state_type x;

        tm_state (&x);

        *sigrc = x.regs[2].word & 255;

        *reason = sim_exited;

        return;

      }

    default:

      abort ();

    }

  *reason = sim_stopped;

}

void

sim_info (sd, verbose)

     SIM_DESC sd;

     int verbose;

{

  sim_state_type x;

  tm_state (&x);

  tm_info_print (&x);

}

SIM_DESC

sim_open (kind, cb, abfd, argv)

     SIM_OPEN_KIND kind;

     host_callback *cb;

     struct _bfd *abfd;

     char **argv;

{

  /* FIXME: The code in sim_load that determines the exact z8k arch

     should be moved to here */

  sim_kind = kind;

  myname = argv[0];

  z8k_callback = cb;

  /* fudge our descriptor for now */

  return (SIM_DESC) 1;

}

void

sim_close (sd, quitting)

     SIM_DESC sd;

     int quitting;

{

  /* nothing to do */

}

SIM_RC

sim_load (sd, prog, abfd, from_tty)

     SIM_DESC sd;

     char *prog;

     bfd *abfd;

     int from_tty;

{

  extern bfd *sim_load_file (); /* ??? Don't know where this should live.  */

  bfd *prog_bfd;

  /* FIXME: The code determining the type of z9k processor should be

     moved from here to sim_open. */

  prog_bfd = sim_load_file (sd, myname, z8k_callback, prog, abfd,

                            sim_kind == SIM_OPEN_DEBUG,

                            0, sim_write);

  if (prog_bfd == NULL)

    return SIM_RC_FAIL;

  if (bfd_get_mach (prog_bfd) == bfd_mach_z8001)

    {

      extern int sim_z8001_mode;

      sim_z8001_mode = 1;

    }

  /* Close the bfd if we opened it.  */

  if (abfd == NULL)

    bfd_close (prog_bfd);

  return SIM_RC_OK;

}

SIM_RC

sim_create_inferior (sd, abfd, argv, env)

     SIM_DESC sd;

     struct _bfd *abfd;

     char **argv;

     char **env;

{

  if (abfd != NULL)

    tm_store_register (REG_PC, bfd_get_start_address (abfd));

  else

    tm_store_register (REG_PC, 0);

  return SIM_RC_OK;

}

void

sim_do_command (sd, cmd)

     SIM_DESC sd;

     char *cmd;

{

}

void

sim_set_callbacks (ptr)

     host_callback *ptr;

{

  z8k_callback = ptr;

}