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1 | /* int.c --- M32C interrupt handling. |
2 | ||
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3 | Copyright (C) 2005, 2007, 2008, 2009, 2010, 2011 |
4 | Free Software Foundation, Inc. | |
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5 | Contributed by Red Hat, Inc. |
6 | ||
7 | This file is part of the GNU simulators. | |
8 | ||
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9 | This program is free software; you can redistribute it and/or modify |
10 | it under the terms of the GNU General Public License as published by | |
11 | the Free Software Foundation; either version 3 of the License, or | |
12 | (at your option) any later version. | |
d45a4bef | 13 | |
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14 | This program is distributed in the hope that it will be useful, |
15 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | GNU General Public License for more details. | |
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18 | |
19 | You should have received a copy of the GNU General Public License | |
4744ac1b | 20 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
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21 | |
22 | ||
23 | #include "int.h" | |
24 | #include "cpu.h" | |
25 | #include "mem.h" | |
26 | ||
3877a145 DD |
27 | static void |
28 | trigger_interrupt (int addr, int clear_u) | |
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29 | { |
30 | int s = get_reg (sp); | |
31 | int f = get_reg (flags); | |
32 | int p = get_reg (pc); | |
33 | ||
3877a145 DD |
34 | if (clear_u) |
35 | set_flags (FLAGBIT_U, 0); | |
36 | set_flags (FLAGBIT_I | FLAGBIT_D, 0); | |
37 | ||
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38 | if (A16) |
39 | { | |
40 | s -= 4; | |
41 | put_reg (sp, s); | |
42 | mem_put_hi (s, p); | |
43 | mem_put_qi (s + 2, f); | |
44 | mem_put_qi (s + 3, ((f >> 4) & 0x0f) | (p >> 16)); | |
45 | } | |
46 | else | |
47 | { | |
48 | s -= 6; | |
49 | put_reg (sp, s); | |
50 | mem_put_si (s, p); | |
51 | mem_put_hi (s + 4, f); | |
52 | } | |
53 | put_reg (pc, mem_get_psi (addr)); | |
3877a145 DD |
54 | } |
55 | ||
56 | void | |
57 | trigger_fixed_interrupt (int addr) | |
58 | { | |
59 | trigger_interrupt (addr, 1); | |
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60 | } |
61 | ||
62 | void | |
63 | trigger_based_interrupt (int vector) | |
64 | { | |
65 | int addr = get_reg (intb) + vector * 4; | |
3877a145 DD |
66 | trigger_interrupt (addr, vector <= 31); |
67 | } | |
68 | ||
69 | void | |
70 | trigger_peripheral_interrupt (int vector, int icaddr) | |
71 | { | |
72 | unsigned char old_ic = mem_get_qi (icaddr); | |
73 | int addr = get_reg (intb) + vector * 4; | |
74 | trigger_interrupt (addr, 1); | |
75 | put_reg (flags, (get_reg (flags) & 0x8fff) | ((old_ic & 7) << 12)); | |
bec7fb47 | 76 | mem_put_qi (icaddr, old_ic & ~ 0x08); |
d45a4bef | 77 | } |