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