76 lines
1.8 KiB
C
76 lines
1.8 KiB
C
/* int.c --- M32C interrupt handling.
|
|
|
|
Copyright (C) 2005, 2007, 2008, 2009 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);
|
|
}
|