Nios® II Software Developer Handbook

ID 683525
Date 8/28/2023
Public
Document Table of Contents

9.5.4.1.2. Using the Unimplemented Instruction Handler

To include the unimplemented instruction handler, turn on the hal.enable_mul_div_emulation BSP property. The emulation routines occupy less than ¾ kilobyte(KB) of memory.
Note: An exception handler must never execute an unimplemented instruction. The HAL exception handling system does not support nested software exceptions.
Figure 23. HAL Software Exception Funnel Including the Optional Instruction Emulation Logic