sim/m32c/int.c

   1 /* int.c --- M32C interrupt handling.
   2
   3 Copyright (C) 2005, 2007 Free Software Foundation, Inc.
   4 Contributed by Red Hat, Inc.
   5
   6 This file is part of the GNU simulators.
   7
   8 The GNU simulators are free software; you can redistribute them and/or
   9 modify them under the terms of the GNU General Public License as
  10 published by the Free Software Foundation; either version 2 of the
  11 License, or (at your option) any later version.
  12
  13 The GNU simulators are distributed in the hope that they will be
  14 useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16 General Public License for more details.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with the GNU simulators; if not, write to the Free Software
  20 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  21 02110-1301, USA  */
  22
  23
  24 #include "int.h"
  25 #include "cpu.h"
  26 #include "mem.h"
  27
  28 void
  29 trigger_fixed_interrupt (int addr)
  30 {
  31   int s = get_reg (sp);
  32   int f = get_reg (flags);
  33   int p = get_reg (pc);
  34
  35   if (A16)
  36     {
  37       s -= 4;
  38       put_reg (sp, s);
  39       mem_put_hi (s, p);
  40       mem_put_qi (s + 2, f);
  41       mem_put_qi (s + 3, ((f >> 4) & 0x0f) | (p >> 16));
  42     }
  43   else
  44     {
  45       s -= 6;
  46       put_reg (sp, s);
  47       mem_put_si (s, p);
  48       mem_put_hi (s + 4, f);
  49     }
  50   put_reg (pc, mem_get_psi (addr));
  51   set_flags (FLAGBIT_U | FLAGBIT_I | FLAGBIT_D, 0);
  52 }
  53
  54 void
  55 trigger_based_interrupt (int vector)
  56 {
  57   int addr = get_reg (intb) + vector * 4;
  58   if (vector <= 31)
  59     set_flags (FLAGBIT_U, 0);
  60   trigger_fixed_interrupt (addr);
  61 }