Earle F. Philhower, III
c3a580ee89
* Add TLS (https) support * Add NTP server * Clean up include path, add BearSSL headers * Allow 2 NTP servers, add ESP8266 compat define * Add MFLN SSL example, free/used/total heap getters * Enable stack thunking * Add tested SSL examples * Add BSSL_validation demo * Add Client Certificate example * Add RP2040 helper docs * Clean up doc errors, missing doc version info * Add WiFiClientSecure documentation * Add NTP docs Fixes #679
90 lines
2.6 KiB
C++
90 lines
2.6 KiB
C++
#include <stdint.h>
|
|
#include <stdlib.h>
|
|
#include <stdio.h>
|
|
#include "StackThunk.h"
|
|
|
|
extern "C" {
|
|
|
|
uint32_t *stack_thunk_ptr = NULL;
|
|
uint32_t *stack_thunk_top = NULL;
|
|
uint32_t *stack_thunk_save = NULL; /* Saved A1 while in BearSSL */
|
|
uint32_t stack_thunk_refcnt = 0;
|
|
|
|
/* Largest stack usage seen in the wild at 6120 */
|
|
#define _stackSize (6400/4)
|
|
#define _stackPaint 0xdeadbeef
|
|
|
|
/* Add a reference, and allocate the stack if necessary */
|
|
void stack_thunk_add_ref() {
|
|
stack_thunk_refcnt++;
|
|
if (stack_thunk_refcnt == 1) {
|
|
// The stack must be in DRAM, or an Soft WDT will follow. Not sure why,
|
|
// maybe too much time is consumed with the non32-bit exception handler.
|
|
// Also, interrupt handling on an IRAM stack would be very slow.
|
|
// Strings on the stack would be very slow to access as well.
|
|
stack_thunk_ptr = (uint32_t *)malloc(_stackSize * sizeof(uint32_t));
|
|
if (!stack_thunk_ptr) {
|
|
// This is a fatal error, stop the sketch
|
|
abort();
|
|
}
|
|
stack_thunk_top = stack_thunk_ptr + _stackSize - 1;
|
|
stack_thunk_save = NULL;
|
|
stack_thunk_repaint();
|
|
}
|
|
}
|
|
|
|
/* Drop a reference, and free stack if no more in use */
|
|
void stack_thunk_del_ref() {
|
|
if (stack_thunk_refcnt == 0) {
|
|
/* Error! */
|
|
return;
|
|
}
|
|
stack_thunk_refcnt--;
|
|
if (!stack_thunk_refcnt) {
|
|
free(stack_thunk_ptr);
|
|
stack_thunk_ptr = NULL;
|
|
stack_thunk_top = NULL;
|
|
stack_thunk_save = NULL;
|
|
}
|
|
}
|
|
|
|
void stack_thunk_repaint() {
|
|
for (int i = 0; i < _stackSize; i++) {
|
|
stack_thunk_ptr[i] = _stackPaint;
|
|
}
|
|
}
|
|
|
|
/* Simple accessor functions used by postmortem */
|
|
uint32_t stack_thunk_get_refcnt() {
|
|
return stack_thunk_refcnt;
|
|
}
|
|
|
|
uint32_t stack_thunk_get_stack_top() {
|
|
return (uint32_t)stack_thunk_top;
|
|
}
|
|
|
|
uint32_t stack_thunk_get_stack_bot() {
|
|
return (uint32_t)stack_thunk_ptr;
|
|
}
|
|
|
|
uint32_t stack_thunk_get_cont_sp() {
|
|
return (uint32_t)stack_thunk_save;
|
|
}
|
|
|
|
/* Return the number of bytes ever used since the stack was created */
|
|
uint32_t stack_thunk_get_max_usage() {
|
|
uint32_t cnt = 0;
|
|
|
|
/* No stack == no usage by definition! */
|
|
if (!stack_thunk_ptr) {
|
|
return 0;
|
|
}
|
|
|
|
for (cnt = 0; (cnt < _stackSize) && (stack_thunk_ptr[cnt] == _stackPaint); cnt++) {
|
|
/* Noop, all work done in for() */
|
|
}
|
|
return 4 * (_stackSize - cnt);
|
|
}
|
|
|
|
};
|