On 5/27/2010 10:52 AM, Marc Gauthier wrote: >>> We use [a syscall] not for the floating-point operations, but for integer >>> divide-by-zero. In principle we could use it for floating-point too, >>> but we currently don't, since generally folks don't expect it there. >>> >> Ah, I see. That probably makes a lot of sense to present as a signal >> the way you do. >> > FWIW, this can also be done using some recognizable illegal > instruction sequence, if the architecture reserves some opcodes > as always illegal. We do reserve a range of illegal values, and this is a great idea. I've removed the syscall from our kernel, and will add support for the appropriate magic in the trap handler once we pick an encoding and give it a name in the assembler. -- Chris Metcalf, Tilera Corp. http://www.tilera.com -- To unsubscribe from this list: send the line "unsubscribe linux-arch" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html