1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
|
/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2018 Scott Shawcroft for Adafruit Industries
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "stack.h"
#include "py/mpconfig.h"
#include "py/runtime.h"
#include "supervisor/cpu.h"
#include "supervisor/port.h"
#include "supervisor/shared/safe_mode.h"
extern uint32_t _estack;
// Requested size.
static uint32_t next_stack_size = CIRCUITPY_DEFAULT_STACK_SIZE;
static uint32_t current_stack_size = 0;
// Actual location and size, may be larger than requested.
static uint32_t *stack_limit = NULL;
static size_t stack_length = 0;
#define EXCEPTION_STACK_SIZE 1024
static void allocate_stack(void) {
if (port_has_fixed_stack()) {
stack_limit = port_stack_get_limit();
stack_length = (port_stack_get_top() - stack_limit) * sizeof(uint32_t);
current_stack_size = stack_length;
} else {
mp_uint_t regs[10];
mp_uint_t sp = cpu_get_regs_and_sp(regs);
mp_uint_t c_size = (mp_uint_t)port_stack_get_top() - sp;
supervisor_allocation *stack_alloc = allocate_memory(c_size + next_stack_size + EXCEPTION_STACK_SIZE, true, false);
if (stack_alloc == NULL) {
stack_alloc = allocate_memory(c_size + CIRCUITPY_DEFAULT_STACK_SIZE + EXCEPTION_STACK_SIZE, true, false);
current_stack_size = CIRCUITPY_DEFAULT_STACK_SIZE;
} else {
current_stack_size = next_stack_size;
}
stack_limit = stack_alloc->ptr;
stack_length = get_allocation_length(stack_alloc);
}
*stack_limit = STACK_CANARY_VALUE;
}
inline bool stack_ok(void) {
return stack_limit == NULL || *stack_limit == STACK_CANARY_VALUE;
}
inline void assert_heap_ok(void) {
if (!stack_ok()) {
reset_into_safe_mode(HEAP_OVERWRITTEN);
}
}
void stack_init(void) {
allocate_stack();
}
void stack_resize(void) {
if (stack_limit == NULL) {
return;
}
if (next_stack_size == current_stack_size) {
*stack_limit = STACK_CANARY_VALUE;
return;
}
free_memory(allocation_from_ptr(stack_limit));
stack_limit = NULL;
allocate_stack();
}
uint32_t *stack_get_bottom(void) {
return stack_limit;
}
size_t stack_get_length(void) {
return stack_length;
}
void set_next_stack_size(uint32_t size) {
next_stack_size = size;
}
uint32_t get_current_stack_size(void) {
return current_stack_size;
}
|
