1 /*
2 * This file is part of the MicroPython project, http://micropython.org/
3 *
4 * The MIT License (MIT)
5 *
6 * Copyright (c) 2014 Paul Sokolovsky
7 *
8 * Permission is hereby granted, free of charge, to any person obtaining a copy
9 * of this software and associated documentation files (the "Software"), to deal
10 * in the Software without restriction, including without limitation the rights
11 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
12 * copies of the Software, and to permit persons to whom the Software is
13 * furnished to do so, subject to the following conditions:
14 *
15 * The above copyright notice and this permission notice shall be included in
16 * all copies or substantial portions of the Software.
17 *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
21 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
22 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
23 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
24 * THE SOFTWARE.
25 */
26
27 #include "py/runtime.h"
28 #include "py/stackctrl.h"
29
mp_stack_ctrl_init(void)30 void mp_stack_ctrl_init(void) {
31 volatile int stack_dummy;
32 MP_STATE_THREAD(stack_top) = (char *)&stack_dummy;
33 }
34
mp_stack_set_top(void * top)35 void mp_stack_set_top(void *top) {
36 MP_STATE_THREAD(stack_top) = top;
37 }
38
mp_stack_usage(void)39 mp_uint_t mp_stack_usage(void) {
40 // Assumes descending stack
41 volatile int stack_dummy;
42 return MP_STATE_THREAD(stack_top) - (char *)&stack_dummy;
43 }
44
45 #if MICROPY_STACK_CHECK
46
mp_stack_set_limit(mp_uint_t limit)47 void mp_stack_set_limit(mp_uint_t limit) {
48 MP_STATE_THREAD(stack_limit) = limit;
49 }
50
mp_stack_check(void)51 void mp_stack_check(void) {
52 if (mp_stack_usage() >= MP_STATE_THREAD(stack_limit)) {
53 mp_raise_recursion_depth();
54 }
55 }
56
57 #endif // MICROPY_STACK_CHECK
58