| 1 | /* int.c --- M32C interrupt handling. |
| 2 | |
| 3 | Copyright (C) 2005-2020 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 | } |