https://dean.sellers.id.au/tags/exceptions/ Recent content in Exceptions on Ampsand Hugo en-AU Dean Sellers Thu, 29 Oct 2026 12:04:08 +1100 https://dean.sellers.id.au/2026/10/19/riscv-05-when-it-goes-wrong/ Mon, 19 Oct 2026 00:10:00 +1100 https://dean.sellers.id.au/2026/10/19/riscv-05-when-it-goes-wrong/ <p class="post-subtitle">When it goes wrong on purpose: traps</p><p><em>Part 5 of the RISC-V soft core series. Previously: <a href="https://dean.sellers.id.au/2026/10/19/riscv-04-talking-to-the-world/">Talking to the world</a>.</em></p> <p>Up to now, if the core was handed an instruction it did not understand, it treated it as a <code>nop</code> and carried on. That is the worst possible answer. A program that goes wrong should <em>stop and say so</em>, and the rest of the machine should be able to decide what to do about it.</p>