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/*

* 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;

static uint32_t next_stack_size = CIRCUITPY_DEFAULT_STACK_SIZE;

static uint32_t current_stack_size = 0;

supervisor_allocation* stack_alloc = NULL;

#define EXCEPTION_STACK_SIZE 1024

void allocate_stack(void) {

if (port_fixed_stack() != NULL) {

stack_alloc = port_fixed_stack();

current_stack_size = stack_alloc->length;

} else {

mp_uint_t regs[10];

mp_uint_t sp = cpu_get_regs_and_sp(regs);

mp_uint_t c_size = (uint32_t) port_stack_get_top() - sp;

stack_alloc = allocate_memory(c_size + next_stack_size + EXCEPTION_STACK_SIZE, true);

if (stack_alloc == NULL) {

stack_alloc = allocate_memory(c_size + CIRCUITPY_DEFAULT_STACK_SIZE + EXCEPTION_STACK_SIZE, true);

current_stack_size = CIRCUITPY_DEFAULT_STACK_SIZE;

} else {

current_stack_size = next_stack_size;

}

}

*stack_alloc->ptr = STACK_CANARY_VALUE;

}

inline bool stack_ok(void) {

return stack_alloc == NULL || *stack_alloc->ptr == 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_alloc == NULL) {

return;

}

if (next_stack_size == current_stack_size) {

*stack_alloc->ptr = STACK_CANARY_VALUE;

return;

}

free_memory(stack_alloc);

stack_alloc = NULL;

allocate_stack();

}

void set_next_stack_size(uint32_t size) {

next_stack_size = size;

}

uint32_t get_current_stack_size(void) {

return current_stack_size;

}