binutils-gdb/sim/m32r/devices.c

/* m32r device support
   Copyright (C) 1997, 1998, 2007, 2008, 2009, 2010
   Free Software Foundation, Inc.
   Contributed by Cygnus Solutions.

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"

#ifdef HAVE_DV_SOCKSER
#include "dv-sockser.h"
#endif

/* Handling the MSPR register is done by creating a device in the core
   mapping that winds up here.  */

device m32r_devices;

int
device_io_read_buffer (device *me, void *source, int space,
		       address_word addr, unsigned nr_bytes,
		       SIM_DESC sd, SIM_CPU *cpu, sim_cia cia)
{
  if (STATE_ENVIRONMENT (sd) != OPERATING_ENVIRONMENT)
    return nr_bytes;

#ifdef HAVE_DV_SOCKSER
  if (addr == UART_INCHAR_ADDR)
    {
      int c = dv_sockser_read (sd);
      if (c == -1)
	return 0;
      *(char *) source = c;
      return 1;
    }
  if (addr == UART_STATUS_ADDR)
    {
      int status = dv_sockser_status (sd);
      unsigned char *p = source;
      p[0] = 0;
      p[1] = (((status & DV_SOCKSER_INPUT_EMPTY)
#ifdef UART_INPUT_READY0
	       ? UART_INPUT_READY : 0)
#else
	       ? 0 : UART_INPUT_READY)
#endif
	      + ((status & DV_SOCKSER_OUTPUT_EMPTY) ? UART_OUTPUT_READY : 0));
      return 2;
    }
#endif

  return nr_bytes;
}

int
device_io_write_buffer (device *me, const void *source, int space,
			address_word addr, unsigned nr_bytes,
			SIM_DESC sd, SIM_CPU *cpu, sim_cia cia)
{
#if WITH_SCACHE
  /* MSPR support is deprecated but is kept in for upward compatibility
     with existing overlay support.  */
  if (addr == MSPR_ADDR)
    {
      if ((*(const char *) source & MSPR_PURGE) != 0)
	scache_flush (sd);
      return nr_bytes;
    }
  if (addr == MCCR_ADDR)
    {
      if ((*(const char *) source & MCCR_CP) != 0)
	scache_flush (sd);
      return nr_bytes;
    }
#endif

  if (STATE_ENVIRONMENT (sd) != OPERATING_ENVIRONMENT)
    return nr_bytes;

#ifdef HAVE_DV_SOCKSER
  if (addr == UART_OUTCHAR_ADDR)
    {
      int rc = dv_sockser_write (sd, *(char *) source);
      return rc == 1;
    }
#endif

  return nr_bytes;
}

void
device_error (device *me, const char *message, ...)
{
}