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Commit5b3d290

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Add synthetic IntegerDivideByZero exception (#7496)
The ROM routine __divsi3 is called by code whenever a division is needed,because there is no divide unit on the ESP8266 core. When the divideroutine in ROM hits a div-by-zero case, it jumpt to an ILL(egal instruction)at a fixed address which causes a HW exception 0 (IllegalInsnException).In the postmortem dump, when an ILL exception is detected at this addressin ROM, convert it to a DivByZeroException for printout (6).Divde by zero errors now print as follows:````--------------- CUT HERE FOR EXCEPTION DECODER ---------------Exception (6):epc1=0x4000dce5 epc2=0x00000000 epc3=0x00000000 excvaddr=0x00000000 depc=0x00000000>>>stack>>>...<<<stack<<<--------------- CUT HERE FOR EXCEPTION DECODER ---------------````And will decode as follows:````Exception 6: IntegerDivideByZero: QUOS, QUOU, REMS, or REMU divisor operand is zeroPC: 0x4000dce5EXCVADDR: 0x00000000Decoding stack results...````
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‎cores/esp8266/core_esp8266_postmortem.cpp‎

Lines changed: 4 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -144,8 +144,11 @@ void __wrap_system_restart_local() {
144144
ets_printf_P(PSTR("\nAbort called\n"));
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}
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elseif (rst_info.reason == REASON_EXCEPTION_RST) {
147+
// The GCC divide routine in ROM jumps to the address below and executes ILL (00 00 00) on div-by-zero
148+
// In that case, print the exception as (6) which is IntegerDivZero
149+
bool div_zero = (rst_info.exccause ==0) && (rst_info.epc1 ==0x4000dce5);
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ets_printf_P(PSTR("\nException (%d):\nepc1=0x%08x epc2=0x%08x epc3=0x%08x excvaddr=0x%08x depc=0x%08x\n"),
148-
rst_info.exccause, rst_info.epc1, rst_info.epc2, rst_info.epc3, rst_info.excvaddr, rst_info.depc);
151+
div_zero ?6 :rst_info.exccause, rst_info.epc1, rst_info.epc2, rst_info.epc3, rst_info.excvaddr, rst_info.depc);
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}
150153
elseif (rst_info.reason == REASON_SOFT_WDT_RST) {
151154
ets_printf_P(PSTR("\nSoft WDT reset\n"));

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