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/* int.c --- M32C interrupt handling.
Copyright (C) 2005, 2007, 2008 Free Software Foundation, Inc.
Contributed by Red Hat, Inc.
This file is part of the GNU simulators.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "int.h"
#include "cpu.h"
#include "mem.h"
static void
trigger_interrupt (int addr, int clear_u)
{
int s = get_reg (sp);
int f = get_reg (flags);
int p = get_reg (pc);
if (clear_u)
set_flags (FLAGBIT_U, 0);
set_flags (FLAGBIT_I | FLAGBIT_D, 0);
if (A16)
{
s -= 4;
put_reg (sp, s);
mem_put_hi (s, p);
mem_put_qi (s + 2, f);
mem_put_qi (s + 3, ((f >> 4) & 0x0f) | (p >> 16));
}
else
{
s -= 6;
put_reg (sp, s);
mem_put_si (s, p);
mem_put_hi (s + 4, f);
}
put_reg (pc, mem_get_psi (addr));
}
void
trigger_fixed_interrupt (int addr)
{
trigger_interrupt (addr, 1);
}
void
trigger_based_interrupt (int vector)
{
int addr = get_reg (intb) + vector * 4;
trigger_interrupt (addr, vector <= 31);
}
void
trigger_peripheral_interrupt (int vector, int icaddr)
{
unsigned char old_ic = mem_get_qi (icaddr);
int addr = get_reg (intb) + vector * 4;
trigger_interrupt (addr, 1);
put_reg (flags, (get_reg (flags) & 0x8fff) | ((old_ic & 7) << 12));
mem_put_qi (icaddr, old_ic & ~ 0x08);
}
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