17.3 TLB Refill Vector Selection

Trap Exception

The Trap exception occurs when a TGE, TGEU, TLT, TLTU, TEQ, TNE, TGEI, TGEUI, TLTI, TLTUI, TEQI, or TNEI instruction results in a TRUE condition. This exception is not maskable.

Processing

The common exception vector is used for this exception, and the Tr code in the Cause register is set.

The EPC register contains the address of the instruction causing the exception unless the instruction is in a branch delay slot, in which case the EPC register contains the address of the preceding branch instruction and the BD bit of the Cause register is set.

Servicing

The process executing at the time of a Trap exception is handed a UNIX SIGFPE/FPE_INTOVF_TRAP (floating-point exception/integer overflow) signal. This error is usually fatal.