/* GNU/Linux/m32r specific low level interface, for the remote server for GDB.
   Copyright (C) 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 "linux-low.h"

#ifdef HAVE_SYS_REG_H
#include <sys/reg.h>
#endif

/* Defined in auto-generated file reg-m32r.c.  */
void init_registers_m32r (void);

#define m32r_num_regs 25

static int m32r_regmap[] = {
#ifdef PT_R0
  PT_R0, PT_R1, PT_R2, PT_R3, PT_R4, PT_R5, PT_R6, PT_R7,
  PT_R8, PT_R9, PT_R10, PT_R11, PT_R12, PT_FP, PT_LR, PT_SPU,
  PT_PSW, PT_CBR, PT_SPI, PT_SPU, PT_BPC, PT_PC, PT_ACCL, PT_ACCH, PT_EVB
#else
  4 * 4, 4 * 5, 4 * 6, 4 * 7, 4 * 0, 4 * 1, 4 * 2, 4 * 8,
  4 * 9, 4 * 10, 4 * 11, 4 * 12, 4 * 13, 4 * 24, 4 * 25, 4 * 23,
  4 * 19, 4 * 31, 4 * 26, 4 * 23, 4 * 20, 4 * 30, 4 * 16, 4 * 15, 4 * 32
#endif
};

static int
m32r_cannot_store_register (int regno)
{
  return (regno >= m32r_num_regs);
}

static int
m32r_cannot_fetch_register (int regno)
{
  return (regno >= m32r_num_regs);
}

static CORE_ADDR
m32r_get_pc ()
{
  unsigned long pc;
  collect_register_by_name ("pc", &pc);
  return pc;
}

static void
m32r_set_pc (CORE_ADDR pc)
{
  unsigned long newpc = pc;
  supply_register_by_name ("pc", &newpc);
}

static const unsigned short m32r_breakpoint = 0x10f1;
#define m32r_breakpoint_len 2

static int
m32r_breakpoint_at (CORE_ADDR where)
{
  unsigned short insn;

  (*the_target->read_memory) (where, (unsigned char *) &insn,
			      m32r_breakpoint_len);
  if (insn == m32r_breakpoint)
    return 1;

  /* If necessary, recognize more trap instructions here.  GDB only uses the
     one.  */
  return 0;
}

struct linux_target_ops the_low_target = {
  init_registers_m32r,
  m32r_num_regs,
  m32r_regmap,
  m32r_cannot_fetch_register,
  m32r_cannot_store_register,
  m32r_get_pc,
  m32r_set_pc,
  (const unsigned char *) &m32r_breakpoint,
  m32r_breakpoint_len,
  NULL,
  0,
  m32r_breakpoint_at,
};