sim/m32c/int.c

   1 /* int.c --- M32C interrupt handling.
   2
   3 Copyright (C) 2005, 2007, 2008 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 void
  27 trigger_fixed_interrupt (int addr)
  28 {
  29   int s = get_reg (sp);
  30   int f = get_reg (flags);
  31   int p = get_reg (pc);
  32
  33   if (A16)
  34     {
  35       s -= 4;
  36       put_reg (sp, s);
  37       mem_put_hi (s, p);
  38       mem_put_qi (s + 2, f);
  39       mem_put_qi (s + 3, ((f >> 4) & 0x0f) | (p >> 16));
  40     }
  41   else
  42     {
  43       s -= 6;
  44       put_reg (sp, s);
  45       mem_put_si (s, p);
  46       mem_put_hi (s + 4, f);
  47     }
  48   put_reg (pc, mem_get_psi (addr));
  49   set_flags (FLAGBIT_U | FLAGBIT_I | FLAGBIT_D, 0);
  50 }
  51
  52 void
  53 trigger_based_interrupt (int vector)
  54 {
  55   int addr = get_reg (intb) + vector * 4;
  56   if (vector <= 31)
  57     set_flags (FLAGBIT_U, 0);
  58   trigger_fixed_interrupt (addr);
  59 }