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

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

   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>

/* The private data for the register cache.  Note that we have one

   per inferior; this is primarily for simplicity, as the performance

   benefit is minimal.  */

struct inferior_regcache_data

{

  int registers_valid;

  unsigned char *registers;

};

static int register_bytes;

static struct reg *reg_defs;

static int num_registers;

const char **gdbserver_expedite_regs;

static struct inferior_regcache_data *

get_regcache (struct thread_info *inf, int fetch)

{

  struct inferior_regcache_data *regcache;

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

  if (regcache == NULL)

    fatal ("no register cache");

  /* FIXME - fetch registers for INF */

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

    {

      fetch_inferior_registers (0);

      regcache->registers_valid = 1;

    }

  return regcache;

}

void

regcache_invalidate_one (struct inferior_list_entry *entry)

{

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

  struct inferior_regcache_data *regcache;

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

  if (regcache->registers_valid)

    {

      struct thread_info *saved_inferior = current_inferior;

      current_inferior = thread;

      store_inferior_registers (-1);

      current_inferior = saved_inferior;

    }

  regcache->registers_valid = 0;

}

void

regcache_invalidate ()

{

  for_each_inferior (&all_threads, regcache_invalidate_one);

}

int

registers_length (void)

{

  return 2 * register_bytes;

}

void *

new_register_cache (void)

{

  struct inferior_regcache_data *regcache;

  regcache = malloc (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 = calloc (1, register_bytes);

  if (regcache->registers == NULL)

    fatal ("Could not allocate register cache.");

  regcache->registers_valid = 0;

  return regcache;

}

void

free_register_cache (void *regcache_p)

{

  struct inferior_regcache_data *regcache

    = (struct inferior_regcache_data *) regcache_p;

  free (regcache->registers);

  free (regcache);

}

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;

}

void

registers_to_string (char *buf)

{

  unsigned char *registers = get_regcache (current_inferior, 1)->registers;

  convert_int_to_ascii (registers, buf, register_bytes);

}

void

registers_from_string (char *buf)

{

  int len = strlen (buf);

  unsigned char *registers = get_regcache (current_inferior, 1)->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 (int n, int fetch)

{

  unsigned char *registers

    = get_regcache (current_inferior, fetch)->registers;

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

}

void

supply_register (int n, const void *buf)

{

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

}

void

supply_register_by_name (const char *name, const void *buf)

{

  supply_register (find_regno (name), buf);

}

void

collect_register (int n, void *buf)

{

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

}

void

collect_register_as_string (int n, char *buf)

{

  convert_int_to_ascii (register_data (n, 1), buf, register_size (n));

}

void

collect_register_by_name (const char *name, void *buf)

{

  collect_register (find_regno (name), buf);

}