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      1 /* int.c --- M32C interrupt handling.
      2 
      3 Copyright (C) 2005-2024 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 /* This must come before any other includes.  */
     22 #include "defs.h"
     23 
     24 #include "int.h"
     25 #include "cpu.h"
     26 #include "mem.h"
     27 
     28 static void
     29 trigger_interrupt (int addr, int clear_u)
     30 {
     31   int s = get_reg (sp);
     32   int f = get_reg (flags);
     33   int p = get_reg (pc);
     34 
     35   if (clear_u)
     36     set_flags (FLAGBIT_U, 0);
     37   set_flags (FLAGBIT_I | FLAGBIT_D, 0);
     38 
     39   if (A16)
     40     {
     41       s -= 4;
     42       put_reg (sp, s);
     43       mem_put_hi (s, p);
     44       mem_put_qi (s + 2, f);
     45       mem_put_qi (s + 3, ((f >> 4) & 0x0f) | (p >> 16));
     46     }
     47   else
     48     {
     49       s -= 6;
     50       put_reg (sp, s);
     51       mem_put_si (s, p);
     52       mem_put_hi (s + 4, f);
     53     }
     54   put_reg (pc, mem_get_psi (addr));
     55 }
     56 
     57 void
     58 trigger_fixed_interrupt (int addr)
     59 {
     60   trigger_interrupt (addr, 1);
     61 }
     62 
     63 void
     64 trigger_based_interrupt (int vector)
     65 {
     66   int addr = get_reg (intb) + vector * 4;
     67   trigger_interrupt (addr, vector <= 31);
     68 }
     69 
     70 void
     71 trigger_peripheral_interrupt (int vector, int icaddr)
     72 {
     73   unsigned char old_ic = mem_get_qi (icaddr);
     74   int addr = get_reg (intb) + vector * 4;
     75   trigger_interrupt (addr, 1);
     76   put_reg (flags, (get_reg (flags) & 0x8fff) | ((old_ic & 7) << 12));
     77   mem_put_qi (icaddr, old_ic & ~ 0x08);
     78 }
     79