esp-idf/tools/test_apps/system/memprot/main/esp32s3/test_panic.c
Martin Vychodil 339fcbf14d System/Security: Memprot API unified (ESP32S3)
Unified Memory protection API for all PMS-aware chips - ESP32S3 port
2022-06-20 02:36:44 +00:00

79 lines
2.4 KiB
C

/*
* SPDX-FileCopyrightText: 2020-2021 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
#include "freertos/xtensa_context.h"
#include "esp_private/panic_internal.h"
#include "hal/wdt_hal.h"
extern void esp_panic_handler(panic_info_t *info);
extern volatile bool g_override_illegal_instruction;
void __real_esp_panic_handler(panic_info_t *info);
void __real_esp_panic_handler_reconfigure_wdts(void);
void __real_soc_hal_stall_core(int core);
static void disable_all_wdts(void)
{
wdt_hal_context_t wdt0_context = {.inst = WDT_MWDT0, .mwdt_dev = &TIMERG0};
#if SOC_TIMER_GROUPS >= 2
wdt_hal_context_t wdt1_context = {.inst = WDT_MWDT1, .mwdt_dev = &TIMERG1};
#endif
//Todo: Refactor to use Interrupt or Task Watchdog API, and a system level WDT context
//Task WDT is the Main Watchdog Timer of Timer Group 0
wdt_hal_write_protect_disable(&wdt0_context);
wdt_hal_disable(&wdt0_context);
wdt_hal_write_protect_enable(&wdt0_context);
#if SOC_TIMER_GROUPS >= 2
//Interupt WDT is the Main Watchdog Timer of Timer Group 1
wdt_hal_write_protect_disable(&wdt1_context);
wdt_hal_disable(&wdt1_context);
wdt_hal_write_protect_enable(&wdt1_context);
#endif
}
/* Memprot test specific IllegalInstruction exception handler:
* when testing the protection against a code execution, sample code
* is being injected into various memory regions which produces
* EXCCAUSE_ILLEGAL on execution attempt. Such a result is expected
* but it causes system reboot in the standard panic handler.
* The following variant of panic handling simply returns back to the
* next instruction and continues normal execution.
*
* NOTE: if EXCCAUSE_ILLEGAL comes from a different source than the testing code
* the behavior is undefined
* */
void __wrap_esp_panic_handler(panic_info_t *info)
{
XtExcFrame *frm = (XtExcFrame *)info->frame;
if ( frm->exccause == EXCCAUSE_ILLEGAL && g_override_illegal_instruction == true ) {
frm->pc = frm->a0;
return;
} else {
__real_esp_panic_handler(info);
}
}
void __wrap_esp_panic_handler_reconfigure_wdts(void)
{
if ( g_override_illegal_instruction == true ) {
disable_all_wdts();
return;
} else {
__real_esp_panic_handler_reconfigure_wdts();
}
}
void __wrap_soc_hal_stall_core(int core)
{
if ( g_override_illegal_instruction == true ) {
return;
} else {
__real_soc_hal_stall_core(core);
}
}