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/*  This file is part of the program psim.

    Copyright (C) 1994-1996,1998, Andrew Cagney <cagney@highland.com.au>

    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 "defs.h"

#include "bfd.h"

#include "gdb/callback.h"

#include "gdb/remote-sim.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 */

static psim *simulator;

static device *root_device;

static host_callback *callbacks;

/* We use GDB's gdbarch_register_name function to map GDB register

   numbers onto names, which we can then look up in the register

   table.  Since the `set architecture' command can select a new

   processor variant at run-time, the meanings of the register numbers

   can change, so we need to make sure the sim uses the same

   name/number mapping that GDB uses.

   (We don't use the REGISTER_NAME macro, which is a wrapper for

   gdbarch_register_name.  We #include GDB's "defs.h", which tries to

   #include GDB's "config.h", but gets ours instead, and REGISTER_NAME

   ends up not getting defined.  Simpler to just use

   gdbarch_register_name directly.)

   We used to just use the REGISTER_NAMES macro from GDB's

   target-dependent header files, which expanded into an initializer

   for an array of strings.  That was kind of nice, because it meant

   that libsim.a had only a compile-time dependency on GDB; using

   gdbarch_register_name directly means that there are now link-time

   and run-time dependencies too.

   Perhaps the host_callback structure could provide a function for

   retrieving register names; that would be cleaner.  */

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;

}

int

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

{

  char *regname;

  if (simulator == NULL) {

    return 0;

  }

  /* GDB will sometimes ask for the contents of a register named "";

     we ignore such requests, and leave garbage in *BUF.  In GDB

     terms, the empty string means "the register with this number is

     not present in the currently selected architecture variant."

     That's following the kludge we're using for the MIPS processors.

     But there are loops that just walk through the entire list of

     names and try to get everything.  */

  regname = gdbarch_register_name (current_gdbarch, regno);

  /* FIXME: ezannoni 2002/04/15 Remove the 'vr' and 'vscr' check

     once AltiVec support is committed.  */

  if (! regname || regname[0] == '\0'

      || (regname[0] == 'v' && regname[1] == 'r')

      || (strcmp (regname, "vscr") == 0))

    return -1;

  TRACE(trace_gdb, ("sim_fetch_register(regno=%d(%s), buf=0x%lx)\n",

                    regno, regname, (long)buf));

  psim_read_register(simulator, MAX_NR_PROCESSORS,

                     buf, regname, raw_transfer);

  return -1;

}

int

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

{

  char *regname;

  if (simulator == NULL)

    return 0;

  /* See comments in sim_fetch_register, above.  */

  regname = gdbarch_register_name (current_gdbarch, regno);

  /* FIXME: ezannoni 2002/04/15 Remove the 'vr' and 'vscr' check

     once AltiVec support is committed.  */

  if (! regname || regname[0] == '\0'

      || (regname[0] == 'v' && regname[1] == 'r')

      || (strcmp (regname, "vscr") == 0))

    return -1;

  TRACE(trace_gdb, ("sim_store_register(regno=%d(%s), buf=0x%lx)\n",

                    regno, regname, (long)buf));

  psim_write_register(simulator, MAX_NR_PROCESSORS,

                      buf, regname, raw_transfer);

  return -1;

}

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);

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

                      &entry_point, "pc", cooked_transfer);

  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 = SIGTRAP;

    else

      *sigrc = status.signal;

    break;

  case was_trap:

    *reason = sim_stopped;

    *sigrc = SIGTRAP;

    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);

}