Tasmota/tasmota/support_crash_recorder.ino

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/*
support_crash_recorder.ino - record the call stack in RTC in case of crash
2019-12-31 13:23:34 +00:00
Copyright (C) 2020 Stephan Hadinger, Theo Arends,
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifdef ESP8266
const uint32_t crash_magic = 0x53415400; // Stack trace magic number (TASx)
const uint32_t crash_rtc_offset = 32; // Offset in RTC memory skipping OTA used block
const uint32_t crash_dump_max_len = 31; // Dump only 31 call addresses to satisfy max JSON length of about 600 characters
/**
* Save crash information in RTC memory
* This function is called automatically if ESP8266 suffers an exception
* It should be kept quick / consise to be able to execute before hardware wdt may kick in
*/
extern "C" void custom_crash_callback(struct rst_info * rst_info, uint32_t stack, uint32_t stack_end )
{
uint32_t addr_written = 0; // how many addresses have we already written in RTC
uint32_t value; // 4 bytes buffer to write to RTC
for (uint32_t i = stack; i < stack_end; i += 4) {
value = *((uint32_t*) i); // load value from stack
if ((value >= 0x40000000) && (value < 0x40300000)) { // keep only addresses in code area
ESP.rtcUserMemoryWrite(crash_rtc_offset + addr_written, (uint32_t*)&value, sizeof(value));
addr_written++;
if (addr_written >= crash_dump_max_len) { break; } // we store only 31 addresses
}
}
value = crash_magic + addr_written;
ESP.rtcUserMemoryWrite(crash_rtc_offset + crash_dump_max_len, (uint32_t*)&value, sizeof(value));
}
// Generate a crash to test the crash recorder
void CmndCrash(void)
{
volatile uint32_t dummy;
dummy = *((uint32_t*) 0x00000000);
}
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// Do an infinite loop to trigger WDT watchdog
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void CmndWDT(void)
{
volatile uint32_t dummy = 0;
while (1) {
dummy++;
}
}
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// This will trigger the os watch after OSWATCH_RESET_TIME (=120) seconds
void CmndBlockedLoop(void)
{
while (1) {
delay(1000);
}
}
// Clear the RTC dump counter when we do a normal reboot, this avoids garbage data to stay in RTC
void CrashDumpClear(void)
{
uint32_t value = 0;
ESP.rtcUserMemoryWrite(crash_rtc_offset + crash_dump_max_len, (uint32_t*)&value, sizeof(value));
}
/*********************************************************************************************\
* CmndCrashDump - dump the crash history - called by `Status 12`
\*********************************************************************************************/
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bool CrashFlag(void)
{
return ((ResetReason() == REASON_EXCEPTION_RST) || (ResetReason() == REASON_SOFT_WDT_RST) || oswatch_blocked_loop);
}
void CrashDump(void)
{
ResponseAppend_P(PSTR("{\"Exception\":%d,\"Reason\":\"%s\",\"EPC\":[\"%08x\",\"%08x\",\"%08x\"],\"EXCVADDR\":\"%08x\",\"DEPC\":\"%08x\""),
resetInfo.exccause, // Exception Cause
GetResetReason().c_str(), // Reset Reason
resetInfo.epc1, // Exception Progam Counter
resetInfo.epc2, // Exception Progam Counter - High-Priority Interrupt 1
resetInfo.epc3, // Exception Progam Counter - High-Priority Interrupt 2
resetInfo.excvaddr, // Exception Virtual Address Register - Virtual address that caused last fetch, load, or store exception
resetInfo.depc); // Double Exception Program Counter
uint32_t value;
ESP.rtcUserMemoryRead(crash_rtc_offset + crash_dump_max_len, (uint32_t*)&value, sizeof(value));
if (crash_magic == (value & 0xFFFFFF00)) {
ResponseAppend_P(PSTR(",\"CallChain\":["));
uint32_t count = value & 0x3F;
for (uint32_t i = 0; i < count; i++) {
ESP.rtcUserMemoryRead(crash_rtc_offset +i, (uint32_t*)&value, sizeof(value));
if (i > 0) { ResponseAppend_P(PSTR(",")); }
ResponseAppend_P(PSTR("\"%08x\""), value);
}
ResponseAppend_P(PSTR("]"));
}
ResponseJsonEnd();
}
#endif // ESP8266