sim/m32c/int.c

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