sim/m32c/int.c

   1 /* int.c --- M32C interrupt handling.
   2
   3 Copyright (C) 2005, 2007, 2008, 2009, 2010, 2011
   4 Free Software Foundation, Inc.
   5 Contributed by Red Hat, Inc.
   6
   7 This file is part of the GNU simulators.
   8
   9 This program is free software; you can redistribute it and/or modify
  10 it under the terms of the GNU General Public License as published by
  11 the Free Software Foundation; either version 3 of the License, or
  12 (at your option) any later version.
  13
  14 This program is distributed in the hope that it will be useful,
  15 but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 GNU General Public License for more details.
  18
  19 You should have received a copy of the GNU General Public License
  20 along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  21
  22
  23 #include "int.h"
  24 #include "cpu.h"
  25 #include "mem.h"
  26
  27 static void
  28 trigger_interrupt (int addr, int clear_u)
  29 {
  30   int s = get_reg (sp);
  31   int f = get_reg (flags);
  32   int p = get_reg (pc);
  33
  34   if (clear_u)
  35     set_flags (FLAGBIT_U, 0);
  36   set_flags (FLAGBIT_I | FLAGBIT_D, 0);
  37
  38   if (A16)
  39     {
  40       s -= 4;
  41       put_reg (sp, s);
  42       mem_put_hi (s, p);
  43       mem_put_qi (s + 2, f);
  44       mem_put_qi (s + 3, ((f >> 4) & 0x0f) | (p >> 16));
  45     }
  46   else
  47     {
  48       s -= 6;
  49       put_reg (sp, s);
  50       mem_put_si (s, p);
  51       mem_put_hi (s + 4, f);
  52     }
  53   put_reg (pc, mem_get_psi (addr));
  54 }
  55
  56 void
  57 trigger_fixed_interrupt (int addr)
  58 {
  59   trigger_interrupt (addr, 1);
  60 }
  61
  62 void
  63 trigger_based_interrupt (int vector)
  64 {
  65   int addr = get_reg (intb) + vector * 4;
  66   trigger_interrupt (addr, vector <= 31);
  67 }
  68
  69 void
  70 trigger_peripheral_interrupt (int vector, int icaddr)
  71 {
  72   unsigned char old_ic = mem_get_qi (icaddr);
  73   int addr = get_reg (intb) + vector * 4;
  74   trigger_interrupt (addr, 1);
  75   put_reg (flags, (get_reg (flags) & 0x8fff) | ((old_ic & 7) << 12));
  76   mem_put_qi (icaddr, old_ic & ~ 0x08);
  77 }