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Soft WDT: detect deliberate infinite loop at Postmortem #8918

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Merged
merged 2 commits into from
Apr 30, 2023
Merged

Soft WDT: detect deliberate infinite loop at Postmortem #8918

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75f9391
Soft WDT: detect deliberate infinite loop at Postmortem
mhightower83 Apr 30, 2023
be94e09
corrected argument order for memcmp_P
mhightower83 Apr 30, 2023
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8 changes: 7 additions & 1 deletion cores/esp8266/core_esp8266_postmortem.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -181,7 +181,13 @@ static void postmortem_report(uint32_t sp_dump) {
exccause, epc1, rst_info.epc2, rst_info.epc3, rst_info.excvaddr, rst_info.depc);
}
else if (rst_info.reason == REASON_SOFT_WDT_RST) {
ets_printf_P(PSTR("\nSoft WDT reset\n"));
ets_printf_P(PSTR("\nSoft WDT reset"));
const char infinite_loop[] = { 0x06, 0xff, 0xff }; // loop: j loop
if (0 == memcmp_P(infinite_loop, (PGM_VOID_P)rst_info.epc1, 3u)) {
// The SDK is riddled with these. They are usually preceded by an ets_printf.
ets_printf_P(PSTR(" - deliberate infinite loop detected"));
}
ets_putc('\n');
ets_printf_P(PSTR("\nException (%d):\nepc1=0x%08x epc2=0x%08x epc3=0x%08x excvaddr=0x%08x depc=0x%08x\n"),
rst_info.exccause, /* Address executing at time of Soft WDT level-1 interrupt */ rst_info.epc1, 0, 0, 0, 0);
}
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