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/*  This file is part of the program psim.

    Copyright 1994, 1995, 1996, 1998, 2003 Andrew Cagney

    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 <signal.h> /* FIXME - should be machine dependant version */

#include <stdarg.h>

#include <ctype.h>

#include "psim.h"

#include "options.h"

#undef printf_filtered /* blow away the mapping */

#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

#include "libiberty.h"

#include "bfd.h"

#include "gdb/callback.h"

#include "gdb/remote-sim.h"

#include "gdb/signals.h"

/* Define the rate at which the simulator should poll the host

   for a quit. */

#ifndef POLL_QUIT_INTERVAL

#define POLL_QUIT_INTERVAL 0x20

#endif

static int poll_quit_count = POLL_QUIT_INTERVAL;

/* Structures used by the simulator, for gdb just have static structures */

psim *simulator;

static device *root_device;

static host_callback *callbacks;

SIM_DESC

sim_open (SIM_OPEN_KIND kind,

          host_callback *callback,

          struct bfd *abfd,

          char **argv)

{

  callbacks = callback;

  /* Note: The simulation is not created by sim_open() because

     complete information is not yet available */

  /* trace the call */

  TRACE(trace_gdb, ("sim_open called\n"));

  if (root_device != NULL)

    sim_io_printf_filtered("Warning - re-open of simulator leaks memory\n");

  root_device = psim_tree();

  simulator = NULL;

  psim_options(root_device, argv + 1);

  if (ppc_trace[trace_opts])

    print_options ();

  /* fudge our descriptor for now */

  return (SIM_DESC) 1;

}

void

sim_close (SIM_DESC sd, int quitting)

{

  TRACE(trace_gdb, ("sim_close(quitting=%d) called\n", quitting));

  if (ppc_trace[trace_print_info] && simulator != NULL)

    psim_print_info (simulator, ppc_trace[trace_print_info]);

}

SIM_RC

sim_load (SIM_DESC sd, char *prog, bfd *abfd, int from_tty)

{

  TRACE(trace_gdb, ("sim_load(prog=%s, from_tty=%d) called\n",

                    prog, from_tty));

  ASSERT(prog != NULL);

  /* create the simulator */

  TRACE(trace_gdb, ("sim_load() - first time, create the simulator\n"));

  simulator = psim_create(prog, root_device);

  /* bring in all the data section */

  psim_init(simulator);

  /* get the start address */

  if (abfd == NULL)

    {

      abfd = bfd_openr (prog, 0);

      if (abfd == NULL)

        error ("psim: can't open \"%s\": %s\n",

               prog, bfd_errmsg (bfd_get_error ()));

      if (!bfd_check_format (abfd, bfd_object))

        {

          const char *errmsg = bfd_errmsg (bfd_get_error ());

          bfd_close (abfd);

          error ("psim: \"%s\" is not an object file: %s\n",

                 prog, errmsg);

        }

      bfd_close (abfd);

    }

  return SIM_RC_OK;

}

int

sim_read (SIM_DESC sd, SIM_ADDR mem, unsigned char *buf, int length)

{

  int result = psim_read_memory(simulator, MAX_NR_PROCESSORS,

                                buf, mem, length);

  TRACE(trace_gdb, ("sim_read(mem=0x%lx, buf=0x%lx, length=%d) = %d\n",

                    (long)mem, (long)buf, length, result));

  return result;

}

int

sim_write (SIM_DESC sd, SIM_ADDR mem, unsigned char *buf, int length)

{

  int result = psim_write_memory(simulator, MAX_NR_PROCESSORS,

                                 buf, mem, length,

                                 1/*violate_ro*/);

  TRACE(trace_gdb, ("sim_write(mem=0x%lx, buf=0x%lx, length=%d) = %d\n",

                    (long)mem, (long)buf, length, result));

  return result;

}

void

sim_info (SIM_DESC sd, int verbose)

{

  TRACE(trace_gdb, ("sim_info(verbose=%d) called\n", verbose));

  psim_print_info (simulator, verbose);

}

SIM_RC

sim_create_inferior (SIM_DESC sd,

                     struct bfd *abfd,

                     char **argv,

                     char **envp)

{

  unsigned_word entry_point;

  TRACE(trace_gdb, ("sim_create_inferior(start_address=0x%x, ...)\n",

                    entry_point));

  if (simulator == NULL)

    error ("No program loaded");

  if (abfd != NULL)

    entry_point = bfd_get_start_address (abfd);

  else

    entry_point = 0xfff00000; /* ??? */

  psim_init(simulator);

  psim_stack(simulator, argv, envp);

  ASSERT (psim_write_register(simulator, -1 /* all start at same PC */,

                              &entry_point, "pc", cooked_transfer) > 0);

  return SIM_RC_OK;

}

void

sim_stop_reason (SIM_DESC sd, enum sim_stop *reason, int *sigrc)

{

  psim_status status = psim_get_status(simulator);

  switch (status.reason) {

  case was_continuing:

    *reason = sim_stopped;

    if (status.signal == 0)

      *sigrc = TARGET_SIGNAL_TRAP;

    else

      *sigrc = status.signal;

    break;

  case was_trap:

    *reason = sim_stopped;

    *sigrc = TARGET_SIGNAL_TRAP;

    break;

  case was_exited:

    *reason = sim_exited;

    *sigrc = status.signal;

    break;

  case was_signalled:

    *reason = sim_signalled;

    *sigrc = status.signal;

    break;

  }

  TRACE(trace_gdb, ("sim_stop_reason(reason=0x%lx(%ld), sigrc=0x%lx(%ld))\n",

                    (long)reason, (long)*reason, (long)sigrc, (long)*sigrc));

}

/* Run (or resume) the program.  */

int

sim_stop (SIM_DESC sd)

{

  psim_stop (simulator);

  return 1;

}

void

sim_resume (SIM_DESC sd, int step, int siggnal)

{

  TRACE(trace_gdb, ("sim_resume(step=%d, siggnal=%d)\n",

                    step, siggnal));

  if (step)

    {

      psim_step (simulator);

    }

  else

    {

      psim_run (simulator);

    }

}

void

sim_do_command (SIM_DESC sd, char *cmd)

{

  TRACE(trace_gdb, ("sim_do_commands(cmd=%s) called\n",

                    cmd ? cmd : "(null)"));

  if (cmd != NULL) {

    char **argv = buildargv(cmd);

    psim_command(root_device, argv);

    freeargv(argv);

  }

}

/* Polling, if required */

void

sim_io_poll_quit (void)

{

  if (callbacks->poll_quit != NULL && poll_quit_count-- < 0)

    {

      poll_quit_count = POLL_QUIT_INTERVAL;

      if (callbacks->poll_quit (callbacks))

        psim_stop (simulator);

    }

}

/* Map simulator IO operations onto the corresponding GDB I/O

   functions.

   NB: Only a limited subset of operations are mapped across.  More

   advanced operations (such as dup or write) must either be mapped to

   one of the below calls or handled internally */

int

sim_io_read_stdin(char *buf,

                  int sizeof_buf)

{

  switch (CURRENT_STDIO) {

  case DO_USE_STDIO:

    return callbacks->read_stdin(callbacks, buf, sizeof_buf);

    break;

  case DONT_USE_STDIO:

    return callbacks->read(callbacks, 0, buf, sizeof_buf);

    break;

  default:

    error("sim_io_read_stdin: unaccounted switch\n");

    break;

  }

  return 0;

}

int

sim_io_write_stdout(const char *buf,

                    int sizeof_buf)

{

  switch (CURRENT_STDIO) {

  case DO_USE_STDIO:

    return callbacks->write_stdout(callbacks, buf, sizeof_buf);

    break;

  case DONT_USE_STDIO:

    return callbacks->write(callbacks, 1, buf, sizeof_buf);

    break;

  default:

    error("sim_io_write_stdout: unaccounted switch\n");

    break;

  }

  return 0;

}

int

sim_io_write_stderr(const char *buf,

                    int sizeof_buf)

{

  switch (CURRENT_STDIO) {

  case DO_USE_STDIO:

    /* NB: I think there should be an explicit write_stderr callback */

    return callbacks->write(callbacks, 3, buf, sizeof_buf);

    break;

  case DONT_USE_STDIO:

    return callbacks->write(callbacks, 3, buf, sizeof_buf);

    break;

  default:

    error("sim_io_write_stderr: unaccounted switch\n");

    break;

  }

  return 0;

}

void

sim_io_printf_filtered(const char *fmt,

                       ...)

{

  char message[1024];

  va_list ap;

  /* format the message */

  va_start(ap, fmt);

  vsprintf(message, fmt, ap);

  va_end(ap);

  /* sanity check */

  if (strlen(message) >= sizeof(message))

    error("sim_io_printf_filtered: buffer overflow\n");

  callbacks->printf_filtered(callbacks, "%s", message);

}

void

sim_io_flush_stdoutput(void)

{

  switch (CURRENT_STDIO) {

  case DO_USE_STDIO:

    callbacks->flush_stdout (callbacks);

    break;

  case DONT_USE_STDIO:

    break;

  default:

    error("sim_io_read_stdin: unaccounted switch\n");

    break;

  }

}

void

sim_io_error (SIM_DESC sd, const char *fmt, ...)

{

  va_list ap;

  va_start(ap, fmt);

  callbacks->evprintf_filtered (callbacks, fmt, ap);

  va_end(ap);

  callbacks->error (callbacks, "");

}

/****/

void *

zalloc(long size)

{

  void *memory = (void*)xmalloc(size);

  if (memory == NULL)

    error("xmalloc failed\n");

  memset(memory, 0, size);

  return memory;

}

void zfree(void *data)

{

  free(data);

}