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/* GNU/Linux/CRIS specific low level interface, for the remote server for GDB.

   Copyright (C) 1995, 1996, 1998, 1999, 2000, 2001, 2002, 2003, 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 "linux-low.h"

#include <sys/ptrace.h>

/* CRISv10 */

#define cris_num_regs 32

/* Locations need to match <include/asm/arch/ptrace.h>.  */

static int cris_regmap[] = {

  15*4, 14*4, 13*4, 12*4,

  11*4, 10*4, 9*4, 8*4,

  7*4, 6*4, 5*4, 4*4,

  3*4, 2*4, 23*4, 19*4,

  -1, -1, -1, -1,

  -1, 17*4, -1, 16*4,

  -1, -1, -1, 18*4,

  -1, 17*4, -1, -1

};

static int

cris_cannot_store_register (int regno)

{

  if (cris_regmap[regno] == -1)

    return 1;

  return (regno >= cris_num_regs);

}

static int

cris_cannot_fetch_register (int regno)

{

  if (cris_regmap[regno] == -1)

    return 1;

  return (regno >= cris_num_regs);

}

extern int debug_threads;

static CORE_ADDR

cris_get_pc (void)

{

  unsigned long pc;

  collect_register_by_name ("pc", &pc);

  if (debug_threads)

    fprintf (stderr, "stop pc is %08lx\n", pc);

  return pc;

}

static void

cris_set_pc (CORE_ADDR pc)

{

  unsigned long newpc = pc;

  supply_register_by_name ("pc", &newpc);

}

static const unsigned short cris_breakpoint = 0xe938;

#define cris_breakpoint_len 2

static int

cris_breakpoint_at (CORE_ADDR where)

{

  unsigned short insn;

  (*the_target->read_memory) (where, (unsigned char *) &insn,

                              cris_breakpoint_len);

  if (insn == cris_breakpoint)

    return 1;

  /* If necessary, recognize more trap instructions here.  GDB only uses the

     one.  */

  return 0;

}

/* We only place breakpoints in empty marker functions, and thread locking

   is outside of the function.  So rather than importing software single-step,

   we can just run until exit.  */

static CORE_ADDR

cris_reinsert_addr (void)

{

  unsigned long pc;

  collect_register_by_name ("srp", &pc);

  return pc;

}

struct linux_target_ops the_low_target = {

  cris_num_regs,

  cris_regmap,

  cris_cannot_fetch_register,

  cris_cannot_store_register,

  cris_get_pc,

  cris_set_pc,

  (const unsigned char *) &cris_breakpoint,

  cris_breakpoint_len,

  cris_reinsert_addr,

  0,

  cris_breakpoint_at,

  0,

  0,

  0,

  0,

};