17.3 TLB Refill Vector Selection

Integer Overflow Exception

An Integer Overflow exception occurs when an ADD, ADDI, SUB, DADD, DADDI or DSUB instruction results in a 2's complement overflow. This exception is not maskable.

Processing

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

The EPC register contains the address of the instruction that caused 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 the exception is handed a UNIX SIGFPE/FPE_INTOVF_TRAP (floating-point exception/integer overflow) signal. This error is usually fatal to the current process.