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/* Register support routines for the remote server for GDB.

   Copyright (C) 2001, 2002, 2004, 2005, 2007, 2008, 2009, 2010

   Free Software Foundation, Inc.

   This file is part of GDB.

   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 "server.h"

#include "regdef.h"

#include <stdlib.h>

#include <string.h>

static int register_bytes;

static struct reg *reg_defs;

static int num_registers;

const char **gdbserver_expedite_regs;

struct regcache *

get_thread_regcache (struct thread_info *thread, int fetch)

{

  struct regcache *regcache;

  regcache = (struct regcache *) inferior_regcache_data (thread);

  if (regcache == NULL)

    fatal ("no register cache");

  if (fetch && regcache->registers_valid == 0)

    {

      struct thread_info *saved_inferior = current_inferior;

      current_inferior = thread;

      fetch_inferior_registers (regcache, -1);

      current_inferior = saved_inferior;

      regcache->registers_valid = 1;

    }

  return regcache;

}

void

regcache_invalidate_one (struct inferior_list_entry *entry)

{

  struct thread_info *thread = (struct thread_info *) entry;

  struct regcache *regcache;

  regcache = (struct regcache *) inferior_regcache_data (thread);

  if (regcache->registers_valid)

    {

      struct thread_info *saved_inferior = current_inferior;

      current_inferior = thread;

      store_inferior_registers (regcache, -1);

      current_inferior = saved_inferior;

    }

  regcache->registers_valid = 0;

}

void

regcache_invalidate (void)

{

  for_each_inferior (&all_threads, regcache_invalidate_one);

}

struct regcache *

new_register_cache (void)

{

  struct regcache *regcache;

  if (register_bytes == 0)

    return NULL; /* The architecture hasn't been initialized yet.  */

  regcache = xmalloc (sizeof (*regcache));

  /* Make sure to zero-initialize the register cache when it is

     created, in case there are registers the target never

     fetches.  This way they'll read as zero instead of

     garbage.  */

  regcache->registers = xcalloc (1, register_bytes);

  regcache->registers_valid = 0;

  return regcache;

}

void

free_register_cache (struct regcache *regcache)

{

  if (regcache)

    {

      free (regcache->registers);

      free (regcache);

    }

}

static void

realloc_register_cache (struct inferior_list_entry *thread_p)

{

  struct thread_info *thread = (struct thread_info *) thread_p;

  struct regcache *regcache

    = (struct regcache *) inferior_regcache_data (thread);

  free_register_cache (regcache);

  set_inferior_regcache_data (thread, new_register_cache ());

}

void

set_register_cache (struct reg *regs, int n)

{

  int offset, i;

  reg_defs = regs;

  num_registers = n;

  offset = 0;

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

    {

      regs[i].offset = offset;

      offset += regs[i].size;

    }

  register_bytes = offset / 8;

  /* Make sure PBUFSIZ is large enough to hold a full register packet.  */

  if (2 * register_bytes + 32 > PBUFSIZ)

    fatal ("Register packet size exceeds PBUFSIZ.");

  /* Re-allocate all pre-existing register caches.  */

  for_each_inferior (&all_threads, realloc_register_cache);

}

void

registers_to_string (struct regcache *regcache, char *buf)

{

  unsigned char *registers = regcache->registers;

  convert_int_to_ascii (registers, buf, register_bytes);

}

void

registers_from_string (struct regcache *regcache, char *buf)

{

  int len = strlen (buf);

  unsigned char *registers = regcache->registers;

  if (len != register_bytes * 2)

    {

      warning ("Wrong sized register packet (expected %d bytes, got %d)",

               2*register_bytes, len);

      if (len > register_bytes * 2)

        len = register_bytes * 2;

    }

  convert_ascii_to_int (buf, registers, len / 2);

}

struct reg *

find_register_by_name (const char *name)

{

  int i;

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

    if (!strcmp (name, reg_defs[i].name))

      return &reg_defs[i];

  fatal ("Unknown register %s requested", name);

  return 0;

}

int

find_regno (const char *name)

{

  int i;

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

    if (!strcmp (name, reg_defs[i].name))

      return i;

  fatal ("Unknown register %s requested", name);

  return -1;

}

struct reg *

find_register_by_number (int n)

{

  return &reg_defs[n];

}

int

register_size (int n)

{

  return reg_defs[n].size / 8;

}

static unsigned char *

register_data (struct regcache *regcache, int n, int fetch)

{

  return regcache->registers + (reg_defs[n].offset / 8);

}

void

supply_register (struct regcache *regcache, int n, const void *buf)

{

  if (buf)

    memcpy (register_data (regcache, n, 0), buf, register_size (n));

  else

    memset (register_data (regcache, n, 0), 0, register_size (n));

}

void

supply_register_by_name (struct regcache *regcache,

                         const char *name, const void *buf)

{

  supply_register (regcache, find_regno (name), buf);

}

void

collect_register (struct regcache *regcache, int n, void *buf)

{

  memcpy (buf, register_data (regcache, n, 1), register_size (n));

}

void

collect_register_as_string (struct regcache *regcache, int n, char *buf)

{

  convert_int_to_ascii (register_data (regcache, n, 1),

                        buf, register_size (n));

}

void

collect_register_by_name (struct regcache *regcache,

                          const char *name, void *buf)

{

  collect_register (regcache, find_regno (name), buf);

}