Hi all, Debian recently got access to Cavium III machines which have an FPU, before we were using Cavium II machines with the kernel FPU emulation. It appears some code (at least openjdk and lcms2, probably more) use the LDXC1 and SDXC1 instructions with word aligned addresses instead of double-word aligned addresses as required by the specification. This causes a SIGILL. The kernel emulation is more relaxed and allow word aligned addresses. First of all I am surprised to get a SIGILL in that case instead of a SIGBUS, and secondly I think the behavior with and without FPU should be consistent. The kernel currently emulates unaligned LDC1 and SDC1 instructions even with an FPU, so I wonder if the kernel should also emulate unaligned LDXC1 and SDXC1 instructions. Any opinion? Thanks, Aurelien -- Aurelien Jarno GPG: 4096R/1DDD8C9B aurelien@xxxxxxxxxxx http://www.aurel32.net
