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77 lines
1.8 KiB
C
77 lines
1.8 KiB
C
/* int.c --- M32C interrupt handling.
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Copyright (C) 2005-2020 Free Software Foundation, Inc.
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Contributed by Red Hat, Inc.
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This file is part of the GNU simulators.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "int.h"
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#include "cpu.h"
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#include "mem.h"
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static void
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trigger_interrupt (int addr, int clear_u)
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{
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int s = get_reg (sp);
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int f = get_reg (flags);
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int p = get_reg (pc);
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if (clear_u)
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set_flags (FLAGBIT_U, 0);
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set_flags (FLAGBIT_I | FLAGBIT_D, 0);
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if (A16)
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{
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s -= 4;
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put_reg (sp, s);
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mem_put_hi (s, p);
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mem_put_qi (s + 2, f);
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mem_put_qi (s + 3, ((f >> 4) & 0x0f) | (p >> 16));
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}
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else
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{
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s -= 6;
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put_reg (sp, s);
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mem_put_si (s, p);
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mem_put_hi (s + 4, f);
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}
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put_reg (pc, mem_get_psi (addr));
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}
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void
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trigger_fixed_interrupt (int addr)
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{
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trigger_interrupt (addr, 1);
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}
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void
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trigger_based_interrupt (int vector)
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{
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int addr = get_reg (intb) + vector * 4;
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trigger_interrupt (addr, vector <= 31);
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}
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void
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trigger_peripheral_interrupt (int vector, int icaddr)
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{
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unsigned char old_ic = mem_get_qi (icaddr);
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int addr = get_reg (intb) + vector * 4;
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trigger_interrupt (addr, 1);
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put_reg (flags, (get_reg (flags) & 0x8fff) | ((old_ic & 7) << 12));
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mem_put_qi (icaddr, old_ic & ~ 0x08);
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}
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