mirror of https://github.com/arendst/Tasmota.git
145 lines
4.3 KiB
C++
145 lines
4.3 KiB
C++
/*
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StackThunk_light.c - Allow use second stack for BearSSL calls
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Light version with reduced Stack size due to Tasmota optimizations.
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BearSSL uses a significant amount of stack space, much larger than
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the default Arduino core stack. These routines handle swapping
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between a secondary, user-allocated stack on the heap and the real
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stack.
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Copyright (c) 2017 Earle F. Philhower, III. All rights reserved.
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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Modified 8 May 2015 by Hristo Gochkov (proper post and file upload handling)
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*/
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#include "my_user_config.h"
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#include <stdint.h>
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#include <stdlib.h>
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#include "StackThunk_light.h"
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#include <ets_sys.h>
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extern "C" {
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uint32_t *stack_thunk_light_ptr = NULL;
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uint32_t *stack_thunk_light_top = NULL;
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uint32_t *stack_thunk_light_save = NULL; /* Saved A1 while in BearSSL */
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uint32_t stack_thunk_light_refcnt = 0;
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//#define _stackSize (5600/4)
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#ifdef USE_MQTT_AWS_IOT
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#define _stackSize (5300/4) // using a light version of bearssl we can save 300 bytes
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#else
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#define _stackSize (3600/4) // using a light version of bearssl we can save 2k
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#endif
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#define _stackPaint 0xdeadbeef
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/* Add a reference, and allocate the stack if necessary */
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void stack_thunk_light_add_ref()
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{
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stack_thunk_light_refcnt++;
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if (stack_thunk_light_refcnt == 1) {
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stack_thunk_light_ptr = (uint32_t *)malloc(_stackSize * sizeof(uint32_t));
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stack_thunk_light_top = stack_thunk_light_ptr + _stackSize - 1;
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stack_thunk_light_save = NULL;
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stack_thunk_light_repaint();
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}
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}
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/* Drop a reference, and free stack if no more in use */
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void stack_thunk_light_del_ref()
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{
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if (stack_thunk_light_refcnt == 0) {
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/* Error! */
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return;
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}
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stack_thunk_light_refcnt--;
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if (!stack_thunk_light_refcnt) {
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free(stack_thunk_light_ptr);
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stack_thunk_light_ptr = NULL;
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stack_thunk_light_top = NULL;
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stack_thunk_light_save = NULL;
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}
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}
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void stack_thunk_light_repaint()
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{
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if (stack_thunk_light_ptr) {
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for (int i=0; i < _stackSize; i++) {
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stack_thunk_light_ptr[i] = _stackPaint;
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}
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}
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}
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/* Simple accessor functions used by postmortem */
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uint32_t stack_thunk_light_get_refcnt() {
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return stack_thunk_light_refcnt;
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}
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uint32_t stack_thunk_light_get_stack_top() {
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return (uint32_t)stack_thunk_light_top;
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}
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uint32_t stack_thunk_light_get_stack_bot() {
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return (uint32_t)stack_thunk_light_ptr;
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}
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uint32_t stack_thunk_light_get_cont_sp() {
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return (uint32_t)stack_thunk_light_save;
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}
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/* Return the number of bytes ever used since the stack was created */
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uint32_t stack_thunk_light_get_max_usage()
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{
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uint32_t cnt = 0;
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/* No stack == no usage by definition! */
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if (!stack_thunk_light_ptr) {
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return 0;
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}
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for (cnt=0; (cnt < _stackSize) && (stack_thunk_light_ptr[cnt] == _stackPaint); cnt++) {
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/* Noop, all work done in for() */
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}
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return 4 * (_stackSize - cnt);
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}
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/* Print the stack from the first used 16-byte chunk to the top, decodable by the exception decoder */
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void stack_thunk_light_dump_stack()
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{
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uint32_t *pos = stack_thunk_light_top;
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while (pos < stack_thunk_light_ptr) {
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if ((pos[0] != _stackPaint) || (pos[1] != _stackPaint) || (pos[2] != _stackPaint) || (pos[3] != _stackPaint))
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break;
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pos += 4;
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}
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ets_printf(">>>stack>>>\n");
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while (pos < stack_thunk_light_ptr) {
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ets_printf("%08x: %08x %08x %08x %08x\n", (int32_t)pos, pos[0], pos[1], pos[2], pos[3]);
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pos += 4;
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}
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ets_printf("<<<stack<<<\n");
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}
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/* Called when the stack overflow is detected by a thunk. Main memory is corrupted at this point. Do not return. */
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void stack_thunk_light_fatal_overflow()
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{
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ets_printf("FATAL ERROR: BSSL stack overflow\n");
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abort();
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}
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};
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