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Use constexpr for ROM divide-by-zero detection

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This commit is contained in:
J. Nick Koston
2026-04-05 12:52:01 -10:00
parent ed7bfa3e0f
commit 9e7c990fc6
1 changed files with 7 additions and 2 deletions
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esphome/components/esp8266/crash_handler.cpp
+7 -2
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@@ -203,9 +203,14 @@ void crash_handler_log() {
// 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.
static constexpr uint32_t EXCCAUSE_ILLEGAL_INSTRUCTION = 0;
static constexpr uint32_t EXCCAUSE_INTEGER_DIVIDE_BY_ZERO = 6;
static constexpr uint32_t ROM_DIV_ZERO_ADDR_1 = 0x4000dce5;
static constexpr uint32_t ROM_DIV_ZERO_ADDR_2 = 0x4000dd3d;
uint32_t exccause = resetInfo.exccause;
if (exccause == 0 && (resetInfo.epc1 == 0x4000dce5 || resetInfo.epc1 == 0x4000dd3d)) {
exccause = 6; // IntegerDivideByZero
if (exccause == EXCCAUSE_ILLEGAL_INSTRUCTION &&
(resetInfo.epc1 == ROM_DIV_ZERO_ADDR_1 || resetInfo.epc1 == ROM_DIV_ZERO_ADDR_2)) {
exccause = EXCCAUSE_INTEGER_DIVIDE_BY_ZERO;
}
const LogString *cause = get_exception_cause(exccause);
if (cause != nullptr) {