sim/m32r/devices.c

   1 /* m32r device support
   2    Copyright (C) 1997-1998, 2007-2012 Free Software Foundation, Inc.
   3    Contributed by Cygnus Solutions.
   4
   5 This file is part of GDB, the GNU debugger.
   6
   7 This program is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 3 of the License, or
  10 (at your option) any later version.
  11
  12 This program is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 #include "sim-main.h"
  21
  22 #ifdef HAVE_DV_SOCKSER
  23 #include "dv-sockser.h"
  24 #endif
  25
  26 /* Handling the MSPR register is done by creating a device in the core
  27    mapping that winds up here.  */
  28
  29 device m32r_devices;
  30
  31 int
  32 device_io_read_buffer (device *me, void *source, int space,
  33                        address_word addr, unsigned nr_bytes,
  34                        SIM_DESC sd, SIM_CPU *cpu, sim_cia cia)
  35 {
  36   if (STATE_ENVIRONMENT (sd) != OPERATING_ENVIRONMENT)
  37     return nr_bytes;
  38
  39 #ifdef HAVE_DV_SOCKSER
  40   if (addr == UART_INCHAR_ADDR)
  41     {
  42       int c = dv_sockser_read (sd);
  43       if (c == -1)
  44         return 0;
  45       *(char *) source = c;
  46       return 1;
  47     }
  48   if (addr == UART_STATUS_ADDR)
  49     {
  50       int status = dv_sockser_status (sd);
  51       unsigned char *p = source;
  52       p[0] = 0;
  53       p[1] = (((status & DV_SOCKSER_INPUT_EMPTY)
  54 #ifdef UART_INPUT_READY0
  55                ? UART_INPUT_READY : 0)
  56 #else
  57                ? 0 : UART_INPUT_READY)
  58 #endif
  59               + ((status & DV_SOCKSER_OUTPUT_EMPTY) ? UART_OUTPUT_READY : 0));
  60       return 2;
  61     }
  62 #endif
  63
  64   return nr_bytes;
  65 }
  66
  67 int
  68 device_io_write_buffer (device *me, const void *source, int space,
  69                         address_word addr, unsigned nr_bytes,
  70                         SIM_DESC sd, SIM_CPU *cpu, sim_cia cia)
  71 {
  72 #if WITH_SCACHE
  73   /* MSPR support is deprecated but is kept in for upward compatibility
  74      with existing overlay support.  */
  75   if (addr == MSPR_ADDR)
  76     {
  77       if ((*(const char *) source & MSPR_PURGE) != 0)
  78         scache_flush (sd);
  79       return nr_bytes;
  80     }
  81   if (addr == MCCR_ADDR)
  82     {
  83       if ((*(const char *) source & MCCR_CP) != 0)
  84         scache_flush (sd);
  85       return nr_bytes;
  86     }
  87 #endif
  88
  89   if (STATE_ENVIRONMENT (sd) != OPERATING_ENVIRONMENT)
  90     return nr_bytes;
  91
  92 #ifdef HAVE_DV_SOCKSER
  93   if (addr == UART_OUTCHAR_ADDR)
  94     {
  95       int rc = dv_sockser_write (sd, *(char *) source);
  96       return rc == 1;
  97     }
  98 #endif
  99
 100   return nr_bytes;
 101 }
 102
 103 void
 104 device_error (device *me, const char *message, ...)
 105 {
 106 }