113 lines
3.4 KiB
C
113 lines
3.4 KiB
C
/*
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* This file is part of the MicroPython project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2018 Scott Shawcroft for Adafruit Industries
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "stack.h"
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#include "py/mpconfig.h"
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#include "py/runtime.h"
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#include "supervisor/cpu.h"
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#include "supervisor/port.h"
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#include "supervisor/shared/safe_mode.h"
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extern uint32_t _estack;
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// Requested size.
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static uint32_t next_stack_size = CIRCUITPY_DEFAULT_STACK_SIZE;
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static uint32_t current_stack_size = 0;
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// Actual location and size, may be larger than requested.
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static uint32_t *stack_limit = NULL;
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static size_t stack_length = 0;
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#define EXCEPTION_STACK_SIZE 1024
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static void allocate_stack(void) {
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if (port_has_fixed_stack()) {
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stack_limit = port_stack_get_limit();
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stack_length = (port_stack_get_top() - stack_limit) * sizeof(uint32_t);
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current_stack_size = stack_length;
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} else {
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mp_uint_t regs[10];
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mp_uint_t sp = cpu_get_regs_and_sp(regs);
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mp_uint_t c_size = (mp_uint_t)port_stack_get_top() - sp;
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supervisor_allocation *stack_alloc = allocate_memory(c_size + next_stack_size + EXCEPTION_STACK_SIZE, true, false);
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if (stack_alloc == NULL) {
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stack_alloc = allocate_memory(c_size + CIRCUITPY_DEFAULT_STACK_SIZE + EXCEPTION_STACK_SIZE, true, false);
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current_stack_size = CIRCUITPY_DEFAULT_STACK_SIZE;
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} else {
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current_stack_size = next_stack_size;
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}
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stack_limit = stack_alloc->ptr;
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stack_length = get_allocation_length(stack_alloc);
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}
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*stack_limit = STACK_CANARY_VALUE;
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}
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inline bool stack_ok(void) {
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return stack_limit == NULL || *stack_limit == STACK_CANARY_VALUE;
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}
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inline void assert_heap_ok(void) {
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if (!stack_ok()) {
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reset_into_safe_mode(HEAP_OVERWRITTEN);
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}
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}
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void stack_init(void) {
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allocate_stack();
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}
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void stack_resize(void) {
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if (stack_limit == NULL) {
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return;
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}
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if (next_stack_size == current_stack_size) {
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*stack_limit = STACK_CANARY_VALUE;
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return;
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}
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free_memory(allocation_from_ptr(stack_limit));
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stack_limit = NULL;
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allocate_stack();
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}
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uint32_t *stack_get_bottom(void) {
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return stack_limit;
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}
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size_t stack_get_length(void) {
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return stack_length;
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}
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void set_next_stack_size(uint32_t size) {
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next_stack_size = size;
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}
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uint32_t get_current_stack_size(void) {
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return current_stack_size;
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}
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