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Soft WDT: detect deliberate infinite loop at Postmortem (#8918)

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A popular method of handling an unrecoverable state is to reboot. The SDK does this in many places by printing a cryptic debug message followed by something equivalent to while(true){}, which compiles down to loop: j loop, creating a Soft WDT reset.
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M Hightower 2023-04-30 16:05:32 -07:00 committed by GitHub
parent c517bfd997
commit 57fa6cdc92
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1 changed files with 7 additions and 1 deletions
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8
cores/esp8266/core_esp8266_postmortem.cpp
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@ -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); exccause, epc1, rst_info.epc2, rst_info.epc3, rst_info.excvaddr, rst_info.depc);
} }
else if (rst_info.reason == REASON_SOFT_WDT_RST) { 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"), 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); rst_info.exccause, /* Address executing at time of Soft WDT level-1 interrupt */ rst_info.epc1, 0, 0, 0, 0);
} }