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Drop impossible exception causes and shorten strings

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The LX106 (ESP8266) has no MMU, TLB, PIF, or privilege levels, so
exception causes 1, 5, 7, 8, 12-18, and 24-26 can never occur.
Remove them and shorten remaining cause names. Also drop Syscall,
Alloca, PCValue, Privileged which are unreachable on this core.
This commit is contained in:
J. Nick Koston
2026-04-05 13:05:40 -10:00
parent 9cdc6f52e0
commit 71649f6c1f
1 changed files with 12 additions and 40 deletions
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esphome/components/esp8266/crash_handler.cpp
+12 -40
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@@ -89,54 +89,26 @@ static inline bool is_crash_reason(uint32_t reason) {
bool crash_handler_has_data() { return is_crash_reason(resetInfo.reason); }
// Xtensa exception cause names (shared with ESP32, same ISA).
// Keep in sync with Xtensa ISA reference manual Table 4-64.
// Uses if-else with LOG_STR instead of switch to avoid CSWTCH jump tables
// (placed in RAM rodata on ESP8266). LOG_STR stores strings in flash via
// PSTR; if-else generates comparison branches with no data table.
// Xtensa exception cause names for the LX106 core (ESP8266).
// Only includes causes that can actually occur on the LX106 — it has no MMU,
// no TLB, no PIF, and no privilege levels, so causes 12-18 and 24-26 are
// impossible and omitted. The numeric cause is always logged as fallback.
// Uses if-else with LOG_STR to avoid CSWTCH jump tables (RAM on ESP8266).
static const LogString *get_exception_cause(uint32_t cause) {
if (cause == 0)
return LOG_STR("IllegalInstruction");
if (cause == 1)
return LOG_STR("Syscall");
return LOG_STR("IllegalInst");
if (cause == 2)
return LOG_STR("InstructionFetchError");
return LOG_STR("InstFetchErr");
if (cause == 3)
return LOG_STR("LoadStoreError");
return LOG_STR("LoadStoreErr");
if (cause == 4)
return LOG_STR("Level1Interrupt");
if (cause == 5)
return LOG_STR("Alloca");
return LOG_STR("Level1Int");
if (cause == 6)
return LOG_STR("IntegerDivideByZero");
if (cause == 7)
return LOG_STR("PCValue");
if (cause == 8)
return LOG_STR("Privileged");
return LOG_STR("DivByZero");
if (cause == 9)
return LOG_STR("LoadStoreAlignment");
if (cause == 12)
return LOG_STR("InstrPDAddrError");
if (cause == 13)
return LOG_STR("LoadStorePIFDataError");
if (cause == 14)
return LOG_STR("InstrPIFAddrError");
if (cause == 15)
return LOG_STR("LoadStorePIFAddrError");
if (cause == 16)
return LOG_STR("InstTLBMiss");
if (cause == 17)
return LOG_STR("InstTLBMultiHit");
if (cause == 18)
return LOG_STR("InstFetchPrivilege");
return LOG_STR("Alignment");
if (cause == 20)
return LOG_STR("InstrFetchProhibited");
if (cause == 24)
return LOG_STR("LoadStoreTLBMiss");
if (cause == 25)
return LOG_STR("LoadStoreTLBMultihit");
if (cause == 26)
return LOG_STR("LoadStorePrivilege");
return LOG_STR("InstFetchProhibited");
if (cause == 28)
return LOG_STR("LoadProhibited");
if (cause == 29)