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/* Generic simulator watchpoint support.

   Copyright (C) 1997, 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 "sim-options.h"

#include "sim-assert.h"

#include <ctype.h>

#ifdef HAVE_STRING_H

#include <string.h>

#else

#ifdef HAVE_STRINGS_H

#include <strings.h>

#endif

#endif

#ifdef HAVE_STDLIB_H

#include <stdlib.h>

#endif

enum {

  OPTION_WATCH_DELETE                      = OPTION_START,

  OPTION_WATCH_INFO,

  OPTION_WATCH_CLOCK,

  OPTION_WATCH_CYCLES,

  OPTION_WATCH_PC,

  OPTION_WATCH_OP,

};

/* Break an option number into its op/int-nr */

static watchpoint_type

option_to_type (SIM_DESC sd,

                int option)

{

  sim_watchpoints *watch = STATE_WATCHPOINTS (sd);

  watchpoint_type type = ((option - OPTION_WATCH_OP)

                          / (watch->nr_interrupts + 1));

  SIM_ASSERT (type >= 0 && type < nr_watchpoint_types);

  return type;

}

static int

option_to_interrupt_nr (SIM_DESC sd,

                        int option)

{

  sim_watchpoints *watch = STATE_WATCHPOINTS (sd);

  int interrupt_nr = ((option - OPTION_WATCH_OP)

                      % (watch->nr_interrupts + 1));

  return interrupt_nr;

}

static int

type_to_option (SIM_DESC sd,

                watchpoint_type type,

                int interrupt_nr)

{

  sim_watchpoints *watch = STATE_WATCHPOINTS (sd);

  return ((type * (watch->nr_interrupts + 1))

          + interrupt_nr

          + OPTION_WATCH_OP);

}

/* Delete one or more watchpoints.  Fail if no watchpoints were found */

static SIM_RC

do_watchpoint_delete (SIM_DESC sd,

                      int ident,

                      watchpoint_type type)

{

  sim_watchpoints *watch = STATE_WATCHPOINTS (sd);

  sim_watch_point **entry = &watch->points;

  SIM_RC status = SIM_RC_FAIL;

  while ((*entry) != NULL)

    {

      if ((*entry)->ident == ident

          || (*entry)->type == type)

        {

          sim_watch_point *dead = (*entry);

          (*entry) = (*entry)->next;

          sim_events_deschedule (sd, dead->event);

          zfree (dead);

          status = SIM_RC_OK;

        }

      else

        entry = &(*entry)->next;

    }

  return status;

}

static char *

watchpoint_type_to_str (SIM_DESC sd,

                        watchpoint_type type)

{

  switch (type)

    {

    case  pc_watchpoint:

      return "pc";

    case clock_watchpoint:

      return "clock";

    case cycles_watchpoint:

      return "cycles";

    case invalid_watchpoint:

    case nr_watchpoint_types:

      return "(invalid-type)";

    }

  return NULL;

}

static char *

interrupt_nr_to_str (SIM_DESC sd,

                     int interrupt_nr)

{

  sim_watchpoints *watch = STATE_WATCHPOINTS (sd);

  if (interrupt_nr < 0)

    return "(invalid-interrupt)";

  else if (interrupt_nr >= watch->nr_interrupts)

    return "breakpoint";

  else

    return watch->interrupt_names[interrupt_nr];

}

static void

do_watchpoint_info (SIM_DESC sd)

{

  sim_watchpoints *watch = STATE_WATCHPOINTS (sd);

  sim_watch_point *point;

  sim_io_printf (sd, "Watchpoints:\n");

  for (point = watch->points; point != NULL; point = point->next)

    {

      sim_io_printf (sd, "%3d: watch %s %s ",

                     point->ident,

                     watchpoint_type_to_str (sd, point->type),

                     interrupt_nr_to_str (sd, point->interrupt_nr));

      if (point->is_periodic)

        sim_io_printf (sd, "+");

      if (!point->is_within)

        sim_io_printf (sd, "!");

      sim_io_printf (sd, "0x%lx", point->arg0);

      if (point->arg1 != point->arg0)

        sim_io_printf (sd, ",0x%lx", point->arg1);

      sim_io_printf (sd, "\n");

    }

}

static sim_event_handler handle_watchpoint;

static SIM_RC

schedule_watchpoint (SIM_DESC sd,

                     sim_watch_point *point)

{

  sim_watchpoints *watch = STATE_WATCHPOINTS (sd);

  switch (point->type)

    {

    case pc_watchpoint:

      point->event = sim_events_watch_sim (sd,

                                           watch->pc,

                                           watch->sizeof_pc,

                                           0/* host-endian */,

                                           point->is_within,

                                           point->arg0, point->arg1,

                                           /* PC in arg0..arg1 */

                                           handle_watchpoint,

                                           point);

      return SIM_RC_OK;

    case clock_watchpoint:

      point->event = sim_events_watch_clock (sd,

                                             point->arg0, /* ms time */

                                             handle_watchpoint,

                                             point);

      return SIM_RC_OK;

    case cycles_watchpoint:

      point->event = sim_events_schedule (sd,

                                          point->arg0, /* time */

                                          handle_watchpoint,

                                          point);

      return SIM_RC_OK;

    default:

      sim_engine_abort (sd, NULL, NULL_CIA,

                        "handle_watchpoint - internal error - bad switch");

      return SIM_RC_FAIL;

    }

  return SIM_RC_OK;

}

static void

handle_watchpoint (SIM_DESC sd, void *data)

{

  sim_watchpoints *watch = STATE_WATCHPOINTS (sd);

  sim_watch_point *point = (sim_watch_point *) data;

  int interrupt_nr = point->interrupt_nr;

  if (point->is_periodic)

    /* reschedule this event before processing it */

    schedule_watchpoint (sd, point);

  else

    do_watchpoint_delete (sd, point->ident, invalid_watchpoint);

  if (point->interrupt_nr == watch->nr_interrupts)

    sim_engine_halt (sd, NULL, NULL, NULL_CIA, sim_stopped, SIM_SIGINT);

  else

    watch->interrupt_handler (sd, &watch->interrupt_names[interrupt_nr]);

}

static SIM_RC

do_watchpoint_create (SIM_DESC sd,

                      watchpoint_type type,

                      int opt,

                      char *arg)

{

  sim_watchpoints *watch = STATE_WATCHPOINTS (sd);

  sim_watch_point **point;

  /* create the watchpoint */

  point = &watch->points;

  while ((*point) != NULL)

    point = &(*point)->next;

  (*point) = ZALLOC (sim_watch_point);

  /* fill in the details */

  (*point)->ident = ++(watch->last_point_nr);

  (*point)->type = option_to_type (sd, opt);

  (*point)->interrupt_nr = option_to_interrupt_nr (sd, opt);

  /* prefixes to arg - +== periodic, !==not or outside */

  (*point)->is_within = 1;

  while (1)

    {

      if (arg[0] == '+')

        (*point)->is_periodic = 1;

      else if (arg[0] == '!')

        (*point)->is_within = 0;

      else

        break;

      arg++;

    }

  (*point)->arg0 = strtoul (arg, &arg, 0);

  if (arg[0] == ',')

    (*point)->arg0 = strtoul (arg, NULL, 0);

  else

    (*point)->arg1 = (*point)->arg0;

  /* schedule it */

  schedule_watchpoint (sd, (*point));

  return SIM_RC_OK;

}

static SIM_RC

watchpoint_option_handler (SIM_DESC sd, sim_cpu *cpu, int opt,

                           char *arg, int is_command)

{

  if (opt >= OPTION_WATCH_OP)

    return do_watchpoint_create (sd, clock_watchpoint, opt, arg);

  else

    switch (opt)

      {

      case OPTION_WATCH_DELETE:

        if (isdigit ((int) arg[0]))

          {

            int ident = strtol (arg, NULL, 0);

            if (do_watchpoint_delete (sd, ident, invalid_watchpoint)

                != SIM_RC_OK)

              {

                sim_io_eprintf (sd, "Watchpoint %d not found\n", ident);

                return SIM_RC_FAIL;

              }

            return SIM_RC_OK;

          }

        else if (strcasecmp (arg, "all") == 0)

          {

            watchpoint_type type;

            for (type = invalid_watchpoint + 1;

                 type < nr_watchpoint_types;

                 type++)

              {

                do_watchpoint_delete (sd, 0, type);

              }

            return SIM_RC_OK;

          }

        else if (strcasecmp (arg, "pc") == 0)

          {

            if (do_watchpoint_delete (sd, 0, pc_watchpoint)

                != SIM_RC_OK)

              {

                sim_io_eprintf (sd, "No PC watchpoints found\n");

                return SIM_RC_FAIL;

              }

            return SIM_RC_OK;

          }

        else if (strcasecmp (arg, "clock") == 0)

          {

            if (do_watchpoint_delete (sd, 0, clock_watchpoint) != SIM_RC_OK)

              {

                sim_io_eprintf (sd, "No CLOCK watchpoints found\n");

                return SIM_RC_FAIL;

              }

            return SIM_RC_OK;

          }

        else if (strcasecmp (arg, "cycles") == 0)

          {

            if (do_watchpoint_delete (sd, 0, cycles_watchpoint) != SIM_RC_OK)

              {

                sim_io_eprintf (sd, "No CYCLES watchpoints found\n");

                return SIM_RC_FAIL;

              }

            return SIM_RC_OK;

          }

        sim_io_eprintf (sd, "Unknown watchpoint type `%s'\n", arg);

        return SIM_RC_FAIL;

      case OPTION_WATCH_INFO:

        {

          do_watchpoint_info (sd);

          return SIM_RC_OK;

        }

      default:

        sim_io_eprintf (sd, "Unknown watch option %d\n", opt);

        return SIM_RC_FAIL;

      }

}

static SIM_RC

sim_watchpoint_init (SIM_DESC sd)

{

  sim_watchpoints *watch = STATE_WATCHPOINTS (sd);

  sim_watch_point *point;

  /* NOTE: Do not need to de-schedule any previous watchpoints as

     sim-events has already done this */

  /* schedule any watchpoints enabled by command line options */

  for (point = watch->points; point != NULL; point = point->next)

    {

      schedule_watchpoint (sd, point);

    }

  return SIM_RC_OK;

}

static const OPTION watchpoint_options[] =

{

  { {"watch-delete", required_argument, NULL, OPTION_WATCH_DELETE },

      '\0', "IDENT|all|pc|cycles|clock", "Delete a watchpoint",

      watchpoint_option_handler },

  { {"watch-info", no_argument, NULL, OPTION_WATCH_INFO },

      '\0', NULL, "List scheduled watchpoints",

      watchpoint_option_handler },

  { {NULL, no_argument, NULL, 0}, '\0', NULL, NULL, NULL }

};

static char *default_interrupt_names[] = { "int", 0, };

SIM_RC

sim_watchpoint_install (SIM_DESC sd)

{

  sim_watchpoints *watch = STATE_WATCHPOINTS (sd);

  SIM_ASSERT (STATE_MAGIC (sd) == SIM_MAGIC_NUMBER);

  /* the basic command set */

  sim_module_add_init_fn (sd, sim_watchpoint_init);

  sim_add_option_table (sd, NULL, watchpoint_options);

  /* fill in some details */

  if (watch->interrupt_names == NULL)

    watch->interrupt_names = default_interrupt_names;

  watch->nr_interrupts = 0;

  while (watch->interrupt_names[watch->nr_interrupts] != NULL)

    watch->nr_interrupts++;

  /* generate more advansed commands */

  {

    OPTION *int_options = NZALLOC (OPTION, 1 + (watch->nr_interrupts + 1) * nr_watchpoint_types);

    int interrupt_nr;

    for (interrupt_nr = 0; interrupt_nr <= watch->nr_interrupts; interrupt_nr++)

      {

        watchpoint_type type;

        for (type = 0; type < nr_watchpoint_types; type++)

          {

            char *name;

            int nr = interrupt_nr * nr_watchpoint_types + type;

            OPTION *option = &int_options[nr];

            asprintf (&name, "watch-%s-%s",

                      watchpoint_type_to_str (sd, type),

                      interrupt_nr_to_str (sd, interrupt_nr));

            option->opt.name = name;

            option->opt.has_arg = required_argument;

            option->opt.val = type_to_option (sd, type, interrupt_nr);

            option->doc = "";

            option->doc_name = "";

            option->handler = watchpoint_option_handler;

          }

      }

    /* adjust first few entries so that they contain real

       documentation, the first entry includes a list of actions. */

    {

      char *prefix =

        "Watch the simulator, take ACTION in COUNT cycles (`+' for every COUNT cycles), ACTION is";

      char *doc;

      int len = strlen (prefix) + 1;

      for (interrupt_nr = 0; interrupt_nr <= watch->nr_interrupts; interrupt_nr++)

        len += strlen (interrupt_nr_to_str (sd, interrupt_nr)) + 1;

      doc = NZALLOC (char, len);

      strcpy (doc, prefix);

      for (interrupt_nr = 0; interrupt_nr <= watch->nr_interrupts; interrupt_nr++)

        {

          strcat (doc, " ");

          strcat (doc, interrupt_nr_to_str (sd, interrupt_nr));

        }

      int_options[0].doc_name = "watch-cycles-ACTION";

      int_options[0].arg = "[+]COUNT";

      int_options[0].doc = doc;

    }

    int_options[1].doc_name = "watch-pc-ACTION";

    int_options[1].arg = "[!]ADDRESS";

    int_options[1].doc =

      "Watch the PC, take ACTION when matches ADDRESS (in range ADDRESS,ADDRESS), `!' negates test";

    int_options[2].doc_name = "watch-clock-ACTION";

    int_options[2].arg = "[+]MILLISECONDS";

    int_options[2].doc =

      "Watch the clock, take ACTION after MILLISECONDS (`+' for every MILLISECONDS)";

    sim_add_option_table (sd, NULL, int_options);

  }

  return SIM_RC_OK;

}