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Detect divide-by-zero from ROM ILL instruction pattern

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GCC's ROM divide routine triggers IllegalInstruction (exccause=0) at
ROM addresses 0x4000dce5/0x4000dd3d instead of IntegerDivideByZero
(exccause=6). Patch exccause to match the Arduino core's postmortem
handler behavior.
This commit is contained in:
J. Nick Koston
2026-04-05 12:51:34 -10:00
parent 64be4504ae
commit ed7bfa3e0f
1 changed files with 9 additions and 3 deletions
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esphome/components/esp8266/crash_handler.cpp
+9 -3
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@@ -200,11 +200,17 @@ void crash_handler_log() {
uint8_t bt_count = read_rtc_backtrace(backtrace, MAX_BACKTRACE);
ESP_LOGE(TAG, "*** CRASH DETECTED ON PREVIOUS BOOT ***");
// Show exception cause for all crash types — WDT resets also populate exccause
const LogString *cause = get_exception_cause(resetInfo.exccause);
// GCC's ROM divide routine triggers IllegalInstruction (exccause=0) at specific
// ROM addresses instead of IntegerDivideByZero (exccause=6). Patch to match
// the Arduino core's postmortem handler behavior.
uint32_t exccause = resetInfo.exccause;
if (exccause == 0 && (resetInfo.epc1 == 0x4000dce5 || resetInfo.epc1 == 0x4000dd3d)) {
exccause = 6; // IntegerDivideByZero
}
const LogString *cause = get_exception_cause(exccause);
if (cause != nullptr) {
ESP_LOGE(TAG, " Reason: %s - %s (exccause=%" PRIu32 ")", LOG_STR_ARG(get_reset_reason(resetInfo.reason)),
LOG_STR_ARG(cause), resetInfo.exccause);
LOG_STR_ARG(cause), exccause);
} else {
ESP_LOGE(TAG, " Reason: %s", LOG_STR_ARG(get_reset_reason(resetInfo.reason)));
}